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---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1402.0532
|
Alican Bozkurt
|
Alican Bozkurt, Musa Tun\c{c} Arslan, Rasim Akin Sevimli, Cem Emre
Akbas, A. Enis \c{C}etin
|
Approximate Computation of DFT without Performing Any Multiplications:
Applications to Radar Signal Processing
| null | null | null | null |
cs.CC
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In many practical problems it is not necessary to compute the DFT in a
perfect manner including some radar problems. In this article a new
multiplication free algorithm for approximate computation of the DFT is
introduced. All multiplications $(a\times b)$ in DFT are replaced by an
operator which computes $sign(a\times b)(|a|+|b|)$. The new transform is
especially useful when the signal processing algorithm requires correlations.
Ambiguity function in radar signal processing requires high number of
multiplications to compute the correlations. This new additive operator is used
to decrease the number of multiplications. Simulation examples involving
passive radars are presented.
|
[
{
"created": "Mon, 3 Feb 2014 21:59:49 GMT",
"version": "v1"
}
] |
2014-02-05
|
[
[
"Bozkurt",
"Alican",
""
],
[
"Arslan",
"Musa Tunç",
""
],
[
"Sevimli",
"Rasim Akin",
""
],
[
"Akbas",
"Cem Emre",
""
],
[
"Çetin",
"A. Enis",
""
]
] |
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] |
1402.0543
|
Bill Rea
|
Jan Koeman and William Rea
|
How Does Latent Semantic Analysis Work? A Visualisation Approach
|
13 pages, 6 figures, 2 tables
| null | null | null |
cs.CL cs.IR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
By using a small example, an analogy to photographic compression, and a
simple visualization using heatmaps, we show that latent semantic analysis
(LSA) is able to extract what appears to be semantic meaning of words from a
set of documents by blurring the distinctions between the words.
|
[
{
"created": "Mon, 3 Feb 2014 23:09:28 GMT",
"version": "v1"
}
] |
2014-02-05
|
[
[
"Koeman",
"Jan",
""
],
[
"Rea",
"William",
""
]
] |
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] |
1402.0550
|
Hau-tieng Wu
|
Stefano Marchesini, Yu-Chao Tu, Hau-tieng Wu
|
Alternating Projection, Ptychographic Imaging and Phase Synchronization
| null |
Applied and Computational Harmonic Analysis 41 (3), 815-851(2019)
|
10.1016/j.acha.2015.06.005
|
LBNL-6583E
|
math.OC physics.optics stat.ME
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We demonstrate necessary and sufficient conditions of the local convergence
of the alternating projection algorithm to a unique solution up to a global
phase factor. Additionally, for the ptychography imaging problem, we discuss
phase synchronization and graph connection Laplacian, and show how to construct
an accurate initial guess to accelerate convergence speed to handle the big
imaging data in the coming new light source era.
|
[
{
"created": "Mon, 3 Feb 2014 23:54:58 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Apr 2014 17:38:47 GMT",
"version": "v2"
},
{
"created": "Mon, 20 Jul 2015 02:21:38 GMT",
"version": "v3"
}
] |
2019-06-10
|
[
[
"Marchesini",
"Stefano",
""
],
[
"Tu",
"Yu-Chao",
""
],
[
"Wu",
"Hau-tieng",
""
]
] |
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] |
1402.0552
|
Brian Slovick
|
Brian A. Slovick, Zhi Gang Yu, and Srini Krishnamurthy
|
Generalized effective-medium theory for metamaterials
|
5 pages, 5 figures
|
Phys. Rev. B 89, 155118 (2014)
|
10.1103/PhysRevB.89.155118
| null |
physics.optics
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present an effective-medium model for calculating the frequency-dependent
effective permittivity $\epsilon(\omega)$ and permeability $\mu(\omega)$ of
metamaterial composites containing spherical particles with arbitrary
permittivity and permeability. The model is derived from the zero-scattering
condition within the dipole approximation, but does not invoke any additional
long-wavelength approximations. As a result, it captures the effects of spatial
dispersion and predicts a finite effective refractive index and antiresonances
in $\epsilon(\omega)$ and $\mu(\omega)$, in agreement with numerical
finite-element calculations.
|
[
{
"created": "Tue, 4 Feb 2014 00:18:17 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Mar 2014 19:52:39 GMT",
"version": "v2"
}
] |
2014-05-01
|
[
[
"Slovick",
"Brian A.",
""
],
[
"Yu",
"Zhi Gang",
""
],
[
"Krishnamurthy",
"Srini",
""
]
] |
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] |
1402.0555
|
Daniel Hsu
|
Alekh Agarwal, Daniel Hsu, Satyen Kale, John Langford, Lihong Li, and
Robert E. Schapire
|
Taming the Monster: A Fast and Simple Algorithm for Contextual Bandits
| null | null | null | null |
cs.LG stat.ML
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a new algorithm for the contextual bandit learning problem, where
the learner repeatedly takes one of $K$ actions in response to the observed
context, and observes the reward only for that chosen action. Our method
assumes access to an oracle for solving fully supervised cost-sensitive
classification problems and achieves the statistically optimal regret guarantee
with only $\tilde{O}(\sqrt{KT/\log N})$ oracle calls across all $T$ rounds,
where $N$ is the number of policies in the policy class we compete against. By
doing so, we obtain the most practical contextual bandit learning algorithm
amongst approaches that work for general policy classes. We further conduct a
proof-of-concept experiment which demonstrates the excellent computational and
prediction performance of (an online variant of) our algorithm relative to
several baselines.
|
[
{
"created": "Tue, 4 Feb 2014 00:48:29 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Oct 2014 01:41:47 GMT",
"version": "v2"
}
] |
2014-10-15
|
[
[
"Agarwal",
"Alekh",
""
],
[
"Hsu",
"Daniel",
""
],
[
"Kale",
"Satyen",
""
],
[
"Langford",
"John",
""
],
[
"Li",
"Lihong",
""
],
[
"Schapire",
"Robert E.",
""
]
] |
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Taming the Monster: A Fast and Simple Algorithm for Contextual Bandits
|
http://arxiv.org/abs/1402.0555v2
|
http://arxiv.org/pdf/1402.0555v2.pdf
|
https://github.com/VowpalWabbit/vowpal_wabbit
| false | false |
https://paperswithcode.com/paper/taming-the-monster-a-fast-and-simple
|
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] |
1402.0556
|
Vahed Qazvinian
|
Vahed Qazvinian, Dragomir R. Radev, Saif M. Mohammad, Bonnie Dorr,
David Zajic, Michael Whidby, Taesun Moon
|
Generating Extractive Summaries of Scientific Paradigms
| null |
Journal Of Artificial Intelligence Research, Volume 46, pages
165-201, 2013
|
10.1613/jair.3732
| null |
cs.IR cs.CL
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Researchers and scientists increasingly find themselves in the position of
having to quickly understand large amounts of technical material. Our goal is
to effectively serve this need by using bibliometric text mining and
summarization techniques to generate summaries of scientific literature. We
show how we can use citations to produce automatically generated, readily
consumable, technical extractive summaries. We first propose C-LexRank, a model
for summarizing single scientific articles based on citations, which employs
community detection and extracts salient information-rich sentences. Next, we
further extend our experiments to summarize a set of papers, which cover the
same scientific topic. We generate extractive summaries of a set of Question
Answering (QA) and Dependency Parsing (DP) papers, their abstracts, and their
citation sentences and show that citations have unique information amenable to
creating a summary.
|
[
{
"created": "Tue, 4 Feb 2014 01:33:10 GMT",
"version": "v1"
}
] |
2014-02-05
|
[
[
"Qazvinian",
"Vahed",
""
],
[
"Radev",
"Dragomir R.",
""
],
[
"Mohammad",
"Saif M.",
""
],
[
"Dorr",
"Bonnie",
""
],
[
"Zajic",
"David",
""
],
[
"Whidby",
"Michael",
""
],
[
"Moon",
"Taesun",
""
]
] |
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] |
1402.0557
|
Eric Huang
|
Eric Huang, Richard E. Korf
|
Optimal Rectangle Packing: An Absolute Placement Approach
| null |
Journal Of Artificial Intelligence Research, Volume 46, pages
47-87, 2013
|
10.1613/jair.3735
| null |
cs.AI cs.DS
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider the problem of finding all enclosing rectangles of minimum area
that can contain a given set of rectangles without overlap. Our rectangle
packer chooses the x-coordinates of all the rectangles before any of the
y-coordinates. We then transform the problem into a perfect-packing problem
with no empty space by adding additional rectangles. To determine the
y-coordinates, we branch on the different rectangles that can be placed in each
empty position. Our packer allows us to extend the known solutions for a
consecutive-square benchmark from 27 to 32 squares. We also introduce three new
benchmarks, avoiding properties that make a benchmark easy, such as rectangles
with shared dimensions. Our third benchmark consists of rectangles of
increasingly high precision. To pack them efficiently, we limit the rectangles
coordinates and the bounding box dimensions to the set of subset sums of the
rectangles dimensions. Overall, our algorithms represent the current
state-of-the-art for this problem, outperforming other algorithms by orders of
magnitude, depending on the benchmark.
|
[
{
"created": "Tue, 4 Feb 2014 01:33:30 GMT",
"version": "v1"
}
] |
2014-02-05
|
[
[
"Huang",
"Eric",
""
],
[
"Korf",
"Richard E.",
""
]
] |
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] |
1402.0558
|
Sebastian Ordyniak
|
Sebastian Ordyniak, Stefan Szeider
|
Parameterized Complexity Results for Exact Bayesian Network Structure
Learning
| null |
Journal Of Artificial Intelligence Research, Volume 46, pages
263-302, 2013
|
10.1613/jair.3744
| null |
cs.AI cs.LG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Bayesian network structure learning is the notoriously difficult problem of
discovering a Bayesian network that optimally represents a given set of
training data. In this paper we study the computational worst-case complexity
of exact Bayesian network structure learning under graph theoretic restrictions
on the (directed) super-structure. The super-structure is an undirected graph
that contains as subgraphs the skeletons of solution networks. We introduce the
directed super-structure as a natural generalization of its undirected
counterpart. Our results apply to several variants of score-based Bayesian
network structure learning where the score of a network decomposes into local
scores of its nodes. Results: We show that exact Bayesian network structure
learning can be carried out in non-uniform polynomial time if the
super-structure has bounded treewidth, and in linear time if in addition the
super-structure has bounded maximum degree. Furthermore, we show that if the
directed super-structure is acyclic, then exact Bayesian network structure
learning can be carried out in quadratic time. We complement these positive
results with a number of hardness results. We show that both restrictions
(treewidth and degree) are essential and cannot be dropped without loosing
uniform polynomial time tractability (subject to a complexity-theoretic
assumption). Similarly, exact Bayesian network structure learning remains
NP-hard for "almost acyclic" directed super-structures. Furthermore, we show
that the restrictions remain essential if we do not search for a globally
optimal network but aim to improve a given network by means of at most k arc
additions, arc deletions, or arc reversals (k-neighborhood local search).
|
[
{
"created": "Tue, 4 Feb 2014 01:33:50 GMT",
"version": "v1"
}
] |
2014-02-05
|
[
[
"Ordyniak",
"Sebastian",
""
],
[
"Szeider",
"Stefan",
""
]
] |
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] |
1402.0559
|
Peter Nightingale
|
Peter Nightingale, Ian Philip Gent, Christopher Jefferson, Ian Miguel
|
Short and Long Supports for Constraint Propagation
| null |
Journal Of Artificial Intelligence Research, Volume 46, pages
1-45, 2013
|
10.1613/jair.3749
| null |
cs.AI
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Special-purpose constraint propagation algorithms frequently make implicit
use of short supports -- by examining a subset of the variables, they can infer
support (a justification that a variable-value pair may still form part of an
assignment that satisfies the constraint) for all other variables and values
and save substantial work -- but short supports have not been studied in their
own right. The two main contributions of this paper are the identification of
short supports as important for constraint propagation, and the introduction of
HaggisGAC, an efficient and effective general purpose propagation algorithm for
exploiting short supports. Given the complexity of HaggisGAC, we present it as
an optimised version of a simpler algorithm ShortGAC. Although experiments
demonstrate the efficiency of ShortGAC compared with other general-purpose
propagation algorithms where a compact set of short supports is available, we
show theoretically and experimentally that HaggisGAC is even better. We also
find that HaggisGAC performs better than GAC-Schema on full-length supports. We
also introduce a variant algorithm HaggisGAC-Stable, which is adapted to avoid
work on backtracking and in some cases can be faster and have significant
reductions in memory use. All the proposed algorithms are excellent for
propagating disjunctions of constraints. In all experiments with disjunctions
we found our algorithms to be faster than Constructive Or and GAC-Schema by at
least an order of magnitude, and up to three orders of magnitude.
|
[
{
"created": "Tue, 4 Feb 2014 01:34:04 GMT",
"version": "v1"
}
] |
2014-02-05
|
[
[
"Nightingale",
"Peter",
""
],
[
"Gent",
"Ian Philip",
""
],
[
"Jefferson",
"Christopher",
""
],
[
"Miguel",
"Ian",
""
]
] |
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] |
1402.0560
|
Javier Garcia
|
Javier Garcia, Fernando Fernandez
|
Safe Exploration of State and Action Spaces in Reinforcement Learning
| null |
Journal Of Artificial Intelligence Research, Volume 45, pages
515-564, 2012
|
10.1613/jair.3761
| null |
cs.LG cs.AI
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper, we consider the important problem of safe exploration in
reinforcement learning. While reinforcement learning is well-suited to domains
with complex transition dynamics and high-dimensional state-action spaces, an
additional challenge is posed by the need for safe and efficient exploration.
Traditional exploration techniques are not particularly useful for solving
dangerous tasks, where the trial and error process may lead to the selection of
actions whose execution in some states may result in damage to the learning
system (or any other system). Consequently, when an agent begins an interaction
with a dangerous and high-dimensional state-action space, an important question
arises; namely, that of how to avoid (or at least minimize) damage caused by
the exploration of the state-action space. We introduce the PI-SRL algorithm
which safely improves suboptimal albeit robust behaviors for continuous state
and action control tasks and which efficiently learns from the experience
gained from the environment. We evaluate the proposed method in four complex
tasks: automatic car parking, pole-balancing, helicopter hovering, and business
management.
|
[
{
"created": "Tue, 4 Feb 2014 01:34:25 GMT",
"version": "v1"
}
] |
2014-02-05
|
[
[
"Garcia",
"Javier",
""
],
[
"Fernandez",
"Fernando",
""
]
] |
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] |
1402.0561
|
Gert de Cooman
|
Gert de Cooman, Enrique Miranda
|
Irrelevant and independent natural extension for sets of desirable
gambles
| null |
Journal Of Artificial Intelligence Research, Volume 45, pages
601-640, 2012
|
10.1613/jair.3770
| null |
cs.AI
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The results in this paper add useful tools to the theory of sets of desirable
gambles, a growing toolbox for reasoning with partial probability assessments.
We investigate how to combine a number of marginal coherent sets of desirable
gambles into a joint set using the properties of epistemic irrelevance and
independence. We provide formulas for the smallest such joint, called their
independent natural extension, and study its main properties. The independent
natural extension of maximal coherent sets of desirable gambles allows us to
define the strong product of sets of desirable gambles. Finally, we explore an
easy way to generalise these results to also apply for the conditional versions
of epistemic irrelevance and independence. Having such a set of tools that are
easily implemented in computer programs is clearly beneficial to fields, like
AI, with a clear interest in coherent reasoning under uncertainty using general
and robust uncertainty models that require no full specification.
|
[
{
"created": "Tue, 4 Feb 2014 01:34:40 GMT",
"version": "v1"
}
] |
2014-02-05
|
[
[
"de Cooman",
"Gert",
""
],
[
"Miranda",
"Enrique",
""
]
] |
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] |
1402.0562
|
Mohammad Gheshlaghi Azar
|
Mohammad Gheshlaghi Azar, Alessandro Lazaric and Emma Brunskill
|
Online Stochastic Optimization under Correlated Bandit Feedback
| null | null | null | null |
stat.ML cs.LG cs.SY
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper we consider the problem of online stochastic optimization of a
locally smooth function under bandit feedback. We introduce the high-confidence
tree (HCT) algorithm, a novel any-time $\mathcal{X}$-armed bandit algorithm,
and derive regret bounds matching the performance of existing state-of-the-art
in terms of dependency on number of steps and smoothness factor. The main
advantage of HCT is that it handles the challenging case of correlated rewards,
whereas existing methods require that the reward-generating process of each arm
is an identically and independent distributed (iid) random process. HCT also
improves on the state-of-the-art in terms of its memory requirement as well as
requiring a weaker smoothness assumption on the mean-reward function in compare
to the previous anytime algorithms. Finally, we discuss how HCT can be applied
to the problem of policy search in reinforcement learning and we report
preliminary empirical results.
|
[
{
"created": "Tue, 4 Feb 2014 01:34:50 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Feb 2014 20:50:52 GMT",
"version": "v2"
},
{
"created": "Mon, 19 May 2014 17:30:53 GMT",
"version": "v3"
}
] |
2014-05-20
|
[
[
"Azar",
"Mohammad Gheshlaghi",
""
],
[
"Lazaric",
"Alessandro",
""
],
[
"Brunskill",
"Emma",
""
]
] |
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] |
1402.0563
|
Marta R. Costa-juss\`a
|
Marta R. Costa-juss\`a, Carlos A. Henr\'iquez, Rafael E. Banchs
|
Evaluating Indirect Strategies for Chinese-Spanish Statistical Machine
Translation
| null |
Journal Of Artificial Intelligence Research, Volume 45, pages
761-780, 2012
|
10.1613/jair.3786
| null |
cs.CL
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Although, Chinese and Spanish are two of the most spoken languages in the
world, not much research has been done in machine translation for this language
pair. This paper focuses on investigating the state-of-the-art of
Chinese-to-Spanish statistical machine translation (SMT), which nowadays is one
of the most popular approaches to machine translation. For this purpose, we
report details of the available parallel corpus which are Basic Traveller
Expressions Corpus (BTEC), Holy Bible and United Nations (UN). Additionally, we
conduct experimental work with the largest of these three corpora to explore
alternative SMT strategies by means of using a pivot language. Three
alternatives are considered for pivoting: cascading, pseudo-corpus and
triangulation. As pivot language, we use either English, Arabic or French.
Results show that, for a phrase-based SMT system, English is the best pivot
language between Chinese and Spanish. We propose a system output combination
using the pivot strategies which is capable of outperforming the direct
translation strategy. The main objective of this work is motivating and
involving the research community to work in this important pair of languages
given their demographic impact.
|
[
{
"created": "Tue, 4 Feb 2014 01:34:56 GMT",
"version": "v1"
}
] |
2014-02-05
|
[
[
"Costa-jussà",
"Marta R.",
""
],
[
"Henríquez",
"Carlos A.",
""
],
[
"Banchs",
"Rafael E.",
""
]
] |
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] |
1402.0564
|
Amanda Jane Coles
|
Amanda Jane Coles, Andrew Ian Coles, Maria Fox, Derek Long
|
A Hybrid LP-RPG Heuristic for Modelling Numeric Resource Flows in
Planning
| null |
Journal Of Artificial Intelligence Research, Volume 46, pages
343-412, 2013
|
10.1613/jair.3788
| null |
cs.AI
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Although the use of metric fluents is fundamental to many practical planning
problems, the study of heuristics to support fully automated planners working
with these fluents remains relatively unexplored. The most widely used
heuristic is the relaxation of metric fluents into interval-valued variables
--- an idea first proposed a decade ago. Other heuristics depend on domain
encodings that supply additional information about fluents, such as capacity
constraints or other resource-related annotations. A particular challenge to
these approaches is in handling interactions between metric fluents that
represent exchange, such as the transformation of quantities of raw materials
into quantities of processed goods, or trading of money for materials. The
usual relaxation of metric fluents is often very poor in these situations,
since it does not recognise that resources, once spent, are no longer available
to be spent again. We present a heuristic for numeric planning problems
building on the propositional relaxed planning graph, but using a mathematical
program for numeric reasoning. We define a class of producer--consumer planning
problems and demonstrate how the numeric constraints in these can be modelled
in a mixed integer program (MIP). This MIP is then combined with a metric
Relaxed Planning Graph (RPG) heuristic to produce an integrated hybrid
heuristic. The MIP tracks resource use more accurately than the usual
relaxation, but relaxes the ordering of actions, while the RPG captures the
causal propositional aspects of the problem. We discuss how these two
components interact to produce a single unified heuristic and go on to explore
how further numeric features of planning problems can be integrated into the
MIP. We show that encoding a limited subset of the propositional problem to
augment the MIP can yield more accurate guidance, partly by exploiting
structure such as propositional landmarks and propositional resources. Our
results show that the use of this heuristic enhances scalability on problems
where numeric resource interaction is key in finding a solution.
|
[
{
"created": "Tue, 4 Feb 2014 01:35:19 GMT",
"version": "v1"
}
] |
2014-02-05
|
[
[
"Coles",
"Amanda Jane",
""
],
[
"Coles",
"Andrew Ian",
""
],
[
"Fox",
"Maria",
""
],
[
"Long",
"Derek",
""
]
] |
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] |
1402.0565
|
Nima Taghipour
|
Nima Taghipour, Daan Fierens, Jesse Davis, Hendrik Blockeel
|
Lifted Variable Elimination: Decoupling the Operators from the
Constraint Language
| null |
Journal Of Artificial Intelligence Research, Volume 47, pages
393-439, 2013
|
10.1613/jair.3793
| null |
cs.AI
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Lifted probabilistic inference algorithms exploit regularities in the
structure of graphical models to perform inference more efficiently. More
specifically, they identify groups of interchangeable variables and perform
inference once per group, as opposed to once per variable. The groups are
defined by means of constraints, so the flexibility of the grouping is
determined by the expressivity of the constraint language. Existing approaches
for exact lifted inference use specific languages for (in)equality constraints,
which often have limited expressivity. In this article, we decouple lifted
inference from the constraint language. We define operators for lifted
inference in terms of relational algebra operators, so that they operate on the
semantic level (the constraints extension) rather than on the syntactic level,
making them language-independent. As a result, lifted inference can be
performed using more powerful constraint languages, which provide more
opportunities for lifting. We empirically demonstrate that this can improve
inference efficiency by orders of magnitude, allowing exact inference where
until now only approximate inference was feasible.
|
[
{
"created": "Tue, 4 Feb 2014 01:35:39 GMT",
"version": "v1"
}
] |
2014-02-05
|
[
[
"Taghipour",
"Nima",
""
],
[
"Fierens",
"Daan",
""
],
[
"Davis",
"Jesse",
""
],
[
"Blockeel",
"Hendrik",
""
]
] |
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] |
1402.0566
|
Frans Adriaan Oliehoek
|
Frans Adriaan Oliehoek, Matthijs T.J. Spaan, Christopher Amato, Shimon
Whiteson
|
Incremental Clustering and Expansion for Faster Optimal Planning in
Dec-POMDPs
| null |
Journal Of Artificial Intelligence Research, Volume 46, pages
449-509, 2013
|
10.1613/jair.3804
| null |
cs.AI
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This article presents the state-of-the-art in optimal solution methods for
decentralized partially observable Markov decision processes (Dec-POMDPs),
which are general models for collaborative multiagent planning under
uncertainty. Building off the generalized multiagent A* (GMAA*) algorithm,
which reduces the problem to a tree of one-shot collaborative Bayesian games
(CBGs), we describe several advances that greatly expand the range of
Dec-POMDPs that can be solved optimally. First, we introduce lossless
incremental clustering of the CBGs solved by GMAA*, which achieves exponential
speedups without sacrificing optimality. Second, we introduce incremental
expansion of nodes in the GMAA* search tree, which avoids the need to expand
all children, the number of which is in the worst case doubly exponential in
the nodes depth. This is particularly beneficial when little clustering is
possible. In addition, we introduce new hybrid heuristic representations that
are more compact and thereby enable the solution of larger Dec-POMDPs. We
provide theoretical guarantees that, when a suitable heuristic is used, both
incremental clustering and incremental expansion yield algorithms that are both
complete and search equivalent. Finally, we present extensive empirical results
demonstrating that GMAA*-ICE, an algorithm that synthesizes these advances, can
optimally solve Dec-POMDPs of unprecedented size.
|
[
{
"created": "Tue, 4 Feb 2014 01:35:59 GMT",
"version": "v1"
}
] |
2014-02-05
|
[
[
"Oliehoek",
"Frans Adriaan",
""
],
[
"Spaan",
"Matthijs T. J.",
""
],
[
"Amato",
"Christopher",
""
],
[
"Whiteson",
"Shimon",
""
]
] |
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] |
1402.0567
|
Tomasz Pawel Michalak
|
Tomasz Pawel Michalak, Karthik V Aadithya, Piotr L. Szczepanski,
Balaraman Ravindran, Nicholas R. Jennings
|
Efficient Computation of the Shapley Value for Game-Theoretic Network
Centrality
| null |
Journal Of Artificial Intelligence Research, Volume 46, pages
607-650, 2013
|
10.1613/jair.3806
| null |
cs.GT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The Shapley value---probably the most important normative payoff division
scheme in coalitional games---has recently been advocated as a useful measure
of centrality in networks. However, although this approach has a variety of
real-world applications (including social and organisational networks,
biological networks and communication networks), its computational properties
have not been widely studied. To date, the only practicable approach to compute
Shapley value-based centrality has been via Monte Carlo simulations which are
computationally expensive and not guaranteed to give an exact answer. Against
this background, this paper presents the first study of the computational
aspects of the Shapley value for network centralities. Specifically, we develop
exact analytical formulae for Shapley value-based centrality in both weighted
and unweighted networks and develop efficient (polynomial time) and exact
algorithms based on them. We empirically evaluate these algorithms on two
real-life examples (an infrastructure network representing the topology of the
Western States Power Grid and a collaboration network from the field of
astrophysics) and demonstrate that they deliver significant speedups over the
Monte Carlo approach. For instance, in the case of unweighted networks our
algorithms are able to return the exact solution about 1600 times faster than
the Monte Carlo approximation, even if we allow for a generous 10% error margin
for the latter method.
|
[
{
"created": "Tue, 4 Feb 2014 01:36:18 GMT",
"version": "v1"
}
] |
2014-02-05
|
[
[
"Michalak",
"Tomasz Pawel",
""
],
[
"Aadithya",
"Karthik V",
""
],
[
"Szczepanski",
"Piotr L.",
""
],
[
"Ravindran",
"Balaraman",
""
],
[
"Jennings",
"Nicholas R.",
""
]
] |
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] |
1402.0568
|
Amit Metodi
|
Amit Metodi, Michael Codish, Peter James Stuckey
|
Boolean Equi-propagation for Concise and Efficient SAT Encodings of
Combinatorial Problems
|
arXiv admin note: text overlap with arXiv:1206.3883
|
Journal Of Artificial Intelligence Research, Volume 46, pages
303-341, 2013
|
10.1613/jair.3809
| null |
cs.AI
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present an approach to propagation-based SAT encoding of combinatorial
problems, Boolean equi-propagation, where constraints are modeled as Boolean
functions which propagate information about equalities between Boolean
literals. This information is then applied to simplify the CNF encoding of the
constraints. A key factor is that considering only a small fragment of a
constraint model at one time enables us to apply stronger, and even complete,
reasoning to detect equivalent literals in that fragment. Once detected,
equivalences apply to simplify the entire constraint model and facilitate
further reasoning on other fragments. Equi-propagation in combination with
partial evaluation and constraint simplification provide the foundation for a
powerful approach to SAT-based finite domain constraint solving. We introduce a
tool called BEE (Ben-Gurion Equi-propagation Encoder) based on these ideas and
demonstrate for a variety of benchmarks that our approach leads to a
considerable reduction in the size of CNF encodings and subsequent speed-ups in
SAT solving times.
|
[
{
"created": "Tue, 4 Feb 2014 01:36:36 GMT",
"version": "v1"
}
] |
2014-02-05
|
[
[
"Metodi",
"Amit",
""
],
[
"Codish",
"Michael",
""
],
[
"Stuckey",
"Peter James",
""
]
] |
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] |
1402.0569
|
Babak Bagheri Hariri
|
Babak Bagheri Hariri, Diego Calvanese, Marco Montali, Giuseppe De
Giacomo, Riccardo De Masellis, Paolo Felli
|
Description Logic Knowledge and Action Bases
| null |
Journal Of Artificial Intelligence Research, Volume 46, pages
651-686, 2013
|
10.1613/jair.3826
| null |
cs.AI cs.LO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Description logic Knowledge and Action Bases (KAB) are a mechanism for
providing both a semantically rich representation of the information on the
domain of interest in terms of a description logic knowledge base and actions
to change such information over time, possibly introducing new objects. We
resort to a variant of DL-Lite where the unique name assumption is not enforced
and where equality between objects may be asserted and inferred. Actions are
specified as sets of conditional effects, where conditions are based on
epistemic queries over the knowledge base (TBox and ABox), and effects are
expressed in terms of new ABoxes. In this setting, we address verification of
temporal properties expressed in a variant of first-order mu-calculus with
quantification across states. Notably, we show decidability of verification,
under a suitable restriction inspired by the notion of weak acyclicity in data
exchange.
|
[
{
"created": "Tue, 4 Feb 2014 01:36:58 GMT",
"version": "v1"
}
] |
2014-02-05
|
[
[
"Hariri",
"Babak Bagheri",
""
],
[
"Calvanese",
"Diego",
""
],
[
"Montali",
"Marco",
""
],
[
"De Giacomo",
"Giuseppe",
""
],
[
"De Masellis",
"Riccardo",
""
],
[
"Felli",
"Paolo",
""
]
] |
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] |
1402.0570
|
Guangtao Wang
|
Guangtao Wang, Qinbao Song, Heli Sun, Xueying Zhang, Baowen Xu, Yuming
Zhou
|
A Feature Subset Selection Algorithm Automatic Recommendation Method
| null |
Journal Of Artificial Intelligence Research, Volume 47, pages
1-34, 2013
|
10.1613/jair.3831
| null |
cs.LG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Many feature subset selection (FSS) algorithms have been proposed, but not
all of them are appropriate for a given feature selection problem. At the same
time, so far there is rarely a good way to choose appropriate FSS algorithms
for the problem at hand. Thus, FSS algorithm automatic recommendation is very
important and practically useful. In this paper, a meta learning based FSS
algorithm automatic recommendation method is presented. The proposed method
first identifies the data sets that are most similar to the one at hand by the
k-nearest neighbor classification algorithm, and the distances among these data
sets are calculated based on the commonly-used data set characteristics. Then,
it ranks all the candidate FSS algorithms according to their performance on
these similar data sets, and chooses the algorithms with best performance as
the appropriate ones. The performance of the candidate FSS algorithms is
evaluated by a multi-criteria metric that takes into account not only the
classification accuracy over the selected features, but also the runtime of
feature selection and the number of selected features. The proposed
recommendation method is extensively tested on 115 real world data sets with 22
well-known and frequently-used different FSS algorithms for five representative
classifiers. The results show the effectiveness of our proposed FSS algorithm
recommendation method.
|
[
{
"created": "Tue, 4 Feb 2014 01:37:24 GMT",
"version": "v1"
}
] |
2014-02-05
|
[
[
"Wang",
"Guangtao",
""
],
[
"Song",
"Qinbao",
""
],
[
"Sun",
"Heli",
""
],
[
"Zhang",
"Xueying",
""
],
[
"Xu",
"Baowen",
""
],
[
"Zhou",
"Yuming",
""
]
] |
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] |
1402.0571
|
Gerald Tesauro
|
Gerald Tesauro, David C. Gondek, Jonathan Lenchner, James Fan, John M.
Prager
|
Analysis of Watson's Strategies for Playing Jeopardy!
| null |
Journal Of Artificial Intelligence Research, Volume 47, pages
205-251, 2013
|
10.1613/jair.3834
| null |
cs.AI
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Major advances in Question Answering technology were needed for IBM Watson to
play Jeopardy! at championship level -- the show requires rapid-fire answers to
challenging natural language questions, broad general knowledge, high
precision, and accurate confidence estimates. In addition, Jeopardy! features
four types of decision making carrying great strategic importance: (1) Daily
Double wagering; (2) Final Jeopardy wagering; (3) selecting the next square
when in control of the board; (4) deciding whether to attempt to answer, i.e.,
"buzz in." Using sophisticated strategies for these decisions, that properly
account for the game state and future event probabilities, can significantly
boost a players overall chances to win, when compared with simple "rule of
thumb" strategies. This article presents our approach to developing Watsons
game-playing strategies, comprising development of a faithful simulation model,
and then using learning and Monte-Carlo methods within the simulator to
optimize Watsons strategic decision-making. After giving a detailed description
of each of our game-strategy algorithms, we then focus in particular on
validating the accuracy of the simulators predictions, and documenting
performance improvements using our methods. Quantitative performance benefits
are shown with respect to both simple heuristic strategies, and actual human
contestant performance in historical episodes. We further extend our analysis
of human play to derive a number of valuable and counterintuitive examples
illustrating how human contestants may improve their performance on the show.
|
[
{
"created": "Tue, 4 Feb 2014 01:37:44 GMT",
"version": "v1"
}
] |
2014-02-05
|
[
[
"Tesauro",
"Gerald",
""
],
[
"Gondek",
"David C.",
""
],
[
"Lenchner",
"Jonathan",
""
],
[
"Fan",
"James",
""
],
[
"Prager",
"John M.",
""
]
] |
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] |
1402.0572
|
Yoram Bachrach
|
Yoram Bachrach, Ely Porat Porat, Jeffrey S. Rosenschein
|
Sharing Rewards in Cooperative Connectivity Games
| null |
Journal Of Artificial Intelligence Research, Volume 47, pages
281-311, 2013
|
10.1613/jair.3841
| null |
cs.GT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider how selfish agents are likely to share revenues derived from
maintaining connectivity between important network servers. We model a network
where a failure of one node may disrupt communication between other nodes as a
cooperative game called the vertex Connectivity Game (CG). In this game, each
agent owns a vertex, and controls all the edges going to and from that vertex.
A coalition of agents wins if it fully connects a certain subset of vertices in
the graph, called the primary vertices. Power indices measure an agents ability
to affect the outcome of the game. We show that in our domain, such indices can
be used to both determine the fair share of the revenues an agent is entitled
to, and identify significant possible points of failure affecting the
reliability of communication in the network. We show that in general graphs,
calculating the Shapley and Banzhaf power indices is #P-complete, but suggest a
polynomial algorithm for calculating them in trees. We also investigate finding
stable payoff divisions of the revenues in CGs, captured by the game theoretic
solution of the core, and its relaxations, the epsilon-core and least core. We
show a polynomial algorithm for computing the core of a CG, but show that
testing whether an imputation is in the epsilon-core is coNP-complete. Finally,
we show that for trees, it is possible to test for epsilon-core imputations in
polynomial time.
|
[
{
"created": "Tue, 4 Feb 2014 01:38:31 GMT",
"version": "v1"
}
] |
2014-02-05
|
[
[
"Bachrach",
"Yoram",
""
],
[
"Porat",
"Ely Porat",
""
],
[
"Rosenschein",
"Jeffrey S.",
""
]
] |
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] |
1402.0573
|
Srdjan Vesic
|
Srdjan Vesic
|
Identifying the Class of Maxi-Consistent Operators in Argumentation
| null |
Journal Of Artificial Intelligence Research, Volume 47, pages
71-93, 2013
|
10.1613/jair.3860
| null |
cs.AI
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Dung's abstract argumentation theory can be seen as a general framework for
non-monotonic reasoning. An important question is then: what is the class of
logics that can be subsumed as instantiations of this theory? The goal of this
paper is to identify and study the large class of logic-based instantiations of
Dung's theory which correspond to the maxi-consistent operator, i.e. to the
function which returns maximal consistent subsets of an inconsistent knowledge
base. In other words, we study the class of instantiations where very extension
of the argumentation system corresponds to exactly one maximal consistent
subset of the knowledge base. We show that an attack relation belonging to this
class must be conflict-dependent, must not be valid, must not be
conflict-complete, must not be symmetric etc. Then, we show that some attack
relations serve as lower or upper bounds of the class (e.g. if an attack
relation contains canonical undercut then it is not a member of this class). By
using our results, we show for all existing attack relations whether or not
they belong to this class. We also define new attack relations which are
members of this class. Finally, we interpret our results and discuss more
general questions, like: what is the added value of argumentation in such a
setting? We believe that this work is a first step towards achieving our
long-term goal, which is to better understand the role of argumentation and,
particularly, the expressivity of logic-based instantiations of Dung-style
argumentation frameworks.
|
[
{
"created": "Tue, 4 Feb 2014 01:38:48 GMT",
"version": "v1"
}
] |
2014-02-05
|
[
[
"Vesic",
"Srdjan",
""
]
] |
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] |
1402.0574
|
Kira Radinsky
|
Kira Radinsky, Sagie Davidovich, Shaul Markovitch
|
Learning to Predict from Textual Data
| null |
Journal Of Artificial Intelligence Research, Volume 45, pages
641-684, 2012
|
10.1613/jair.3865
| null |
cs.CL cs.AI cs.IR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Given a current news event, we tackle the problem of generating plausible
predictions of future events it might cause. We present a new methodology for
modeling and predicting such future news events using machine learning and data
mining techniques. Our Pundit algorithm generalizes examples of causality pairs
to infer a causality predictor. To obtain precisely labeled causality examples,
we mine 150 years of news articles and apply semantic natural language modeling
techniques to headlines containing certain predefined causality patterns. For
generalization, the model uses a vast number of world knowledge ontologies.
Empirical evaluation on real news articles shows that our Pundit algorithm
performs as well as non-expert humans.
|
[
{
"created": "Tue, 4 Feb 2014 01:39:12 GMT",
"version": "v1"
}
] |
2014-02-05
|
[
[
"Radinsky",
"Kira",
""
],
[
"Davidovich",
"Sagie",
""
],
[
"Markovitch",
"Shaul",
""
]
] |
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] |
1402.0575
|
Diego Calvanese
|
Diego Calvanese, Magdalena Ortiz, Mantas Simkus, Giorgio Stefanoni
|
Reasoning about Explanations for Negative Query Answers in DL-Lite
| null |
Journal Of Artificial Intelligence Research, Volume 48, pages
635-669, 2013
|
10.1613/jair.3870
| null |
cs.AI cs.LO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In order to meet usability requirements, most logic-based applications
provide explanation facilities for reasoning services. This holds also for
Description Logics, where research has focused on the explanation of both TBox
reasoning and, more recently, query answering. Besides explaining the presence
of a tuple in a query answer, it is important to explain also why a given tuple
is missing. We address the latter problem for instance and conjunctive query
answering over DL-Lite ontologies by adopting abductive reasoning; that is, we
look for additions to the ABox that force a given tuple to be in the result. As
reasoning tasks we consider existence and recognition of an explanation, and
relevance and necessity of a given assertion for an explanation. We
characterize the computational complexity of these problems for arbitrary,
subset minimal, and cardinality minimal explanations.
|
[
{
"created": "Tue, 4 Feb 2014 01:39:28 GMT",
"version": "v1"
}
] |
2014-02-05
|
[
[
"Calvanese",
"Diego",
""
],
[
"Ortiz",
"Magdalena",
""
],
[
"Simkus",
"Mantas",
""
],
[
"Stefanoni",
"Giorgio",
""
]
] |
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0.02197149582207203
] |
1402.0576
|
Ilianna Kollia
|
Ilianna Kollia, Birte Glimm
|
Optimizing SPARQL Query Answering over OWL Ontologies
| null |
Journal Of Artificial Intelligence Research, Volume 48, pages
253-303, 2013
|
10.1613/jair.3872
| null |
cs.DB cs.AI
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The SPARQL query language is currently being extended by the World Wide Web
Consortium (W3C) with so-called entailment regimes. An entailment regime
defines how queries are evaluated under more expressive semantics than SPARQLs
standard simple entailment, which is based on subgraph matching. The queries
are very expressive since variables can occur within complex concepts and can
also bind to concept or role names. In this paper, we describe a sound and
complete algorithm for the OWL Direct Semantics entailment regime. We further
propose several novel optimizations such as strategies for determining a good
query execution order, query rewriting techniques, and show how specialized OWL
reasoning tasks and the concept and role hierarchy can be used to reduce the
query execution time. For determining a good execution order, we propose a
cost-based model, where the costs are based on information about the instances
of concepts and roles that are extracted from a model abstraction built by an
OWL reasoner. We present two ordering strategies: a static and a dynamic one.
For the dynamic case, we improve the performance by exploiting an individual
clustering approach that allows for computing the cost functions based on one
individual sample from a cluster. We provide a prototypical implementation and
evaluate the efficiency of the proposed optimizations. Our experimental study
shows that the static ordering usually outperforms the dynamic one when
accurate statistics are available. This changes, however, when the statistics
are less accurate, e.g., due to nondeterministic reasoning decisions. For
queries that go beyond conjunctive instance queries we observe an improvement
of up to three orders of magnitude due to the proposed optimizations.
|
[
{
"created": "Tue, 4 Feb 2014 01:39:51 GMT",
"version": "v1"
}
] |
2014-02-05
|
[
[
"Kollia",
"Ilianna",
""
],
[
"Glimm",
"Birte",
""
]
] |
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] |
1402.0577
|
Rapha\"el Mourad
|
Rapha\"el Mourad, Christine Sinoquet, Nevin L. Zhang, Tengfei Liu,
Philippe Leray
|
A Survey on Latent Tree Models and Applications
| null |
Journal Of Artificial Intelligence Research, Volume 47, pages
157-203, 2013
|
10.1613/jair.3879
| null |
cs.LG
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In data analysis, latent variables play a central role because they help
provide powerful insights into a wide variety of phenomena, ranging from
biological to human sciences. The latent tree model, a particular type of
probabilistic graphical models, deserves attention. Its simple structure - a
tree - allows simple and efficient inference, while its latent variables
capture complex relationships. In the past decade, the latent tree model has
been subject to significant theoretical and methodological developments. In
this review, we propose a comprehensive study of this model. First we summarize
key ideas underlying the model. Second we explain how it can be efficiently
learned from data. Third we illustrate its use within three types of
applications: latent structure discovery, multidimensional clustering, and
probabilistic inference. Finally, we conclude and give promising directions for
future researches in this field.
|
[
{
"created": "Tue, 4 Feb 2014 01:40:28 GMT",
"version": "v1"
}
] |
2014-02-05
|
[
[
"Mourad",
"Raphaël",
""
],
[
"Sinoquet",
"Christine",
""
],
[
"Zhang",
"Nevin L.",
""
],
[
"Liu",
"Tengfei",
""
],
[
"Leray",
"Philippe",
""
]
] |
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] |
1402.0578
|
Maytham Alabbas
|
Maytham Alabbas, Allan Ramsay
|
Natural Language Inference for Arabic Using Extended Tree Edit Distance
with Subtrees
| null |
Journal Of Artificial Intelligence Research, Volume 48, pages
1-22, 2013
|
10.1613/jair.3892
| null |
cs.CL
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Many natural language processing (NLP) applications require the computation
of similarities between pairs of syntactic or semantic trees. Many researchers
have used tree edit distance for this task, but this technique suffers from the
drawback that it deals with single node operations only. We have extended the
standard tree edit distance algorithm to deal with subtree transformation
operations as well as single nodes. The extended algorithm with subtree
operations, TED+ST, is more effective and flexible than the standard algorithm,
especially for applications that pay attention to relations among nodes (e.g.
in linguistic trees, deleting a modifier subtree should be cheaper than the sum
of deleting its components individually). We describe the use of TED+ST for
checking entailment between two Arabic text snippets. The preliminary results
of using TED+ST were encouraging when compared with two string-based approaches
and with the standard algorithm.
|
[
{
"created": "Tue, 4 Feb 2014 01:40:42 GMT",
"version": "v1"
}
] |
2014-02-05
|
[
[
"Alabbas",
"Maytham",
""
],
[
"Ramsay",
"Allan",
""
]
] |
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] |
1402.0579
|
Masahiro Ono
|
Masahiro Ono, Brian C. Williams, L. Blackmore
|
Probabilistic Planning for Continuous Dynamic Systems under Bounded Risk
| null |
Journal Of Artificial Intelligence Research, Volume 46, pages
511-577, 2013
|
10.1613/jair.3893
| null |
cs.AI
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This paper presents a model-based planner called the Probabilistic Sulu
Planner or the p-Sulu Planner, which controls stochastic systems in a goal
directed manner within user-specified risk bounds. The objective of the p-Sulu
Planner is to allow users to command continuous, stochastic systems, such as
unmanned aerial and space vehicles, in a manner that is both intuitive and
safe. To this end, we first develop a new plan representation called a
chance-constrained qualitative state plan (CCQSP), through which users can
specify the desired evolution of the plant state as well as the acceptable
level of risk. An example of a CCQSP statement is go to A through B within 30
minutes, with less than 0.001% probability of failure." We then develop the
p-Sulu Planner, which can tractably solve a CCQSP planning problem. In order to
enable CCQSP planning, we develop the following two capabilities in this paper:
1) risk-sensitive planning with risk bounds, and 2) goal-directed planning in a
continuous domain with temporal constraints. The first capability is to ensures
that the probability of failure is bounded. The second capability is essential
for the planner to solve problems with a continuous state space such as vehicle
path planning. We demonstrate the capabilities of the p-Sulu Planner by
simulations on two real-world scenarios: the path planning and scheduling of a
personal aerial vehicle as well as the space rendezvous of an autonomous cargo
spacecraft.
|
[
{
"created": "Tue, 4 Feb 2014 01:41:20 GMT",
"version": "v1"
}
] |
2014-02-05
|
[
[
"Ono",
"Masahiro",
""
],
[
"Williams",
"Brian C.",
""
],
[
"Blackmore",
"L.",
""
]
] |
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] |
1402.0580
|
Nadja Betzler
|
Nadja Betzler, Arkadii Slinko, Johannes Uhlmann
|
On the Computation of Fully Proportional Representation
| null |
Journal Of Artificial Intelligence Research, Volume 47, pages
475-519, 2013
|
10.1613/jair.3896
| null |
cs.GT cs.MA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate two systems of fully proportional representation suggested by
Chamberlin Courant and Monroe. Both systems assign a representative to each
voter so that the "sum of misrepresentations" is minimized. The winner
determination problem for both systems is known to be NP-hard, hence this work
aims at investigating whether there are variants of the proposed rules and/or
specific electorates for which these problems can be solved efficiently. As a
variation of these rules, instead of minimizing the sum of misrepresentations,
we considered minimizing the maximal misrepresentation introducing effectively
two new rules. In the general case these "minimax" versions of classical rules
appeared to be still NP-hard. We investigated the parameterized complexity of
winner determination of the two classical and two new rules with respect to
several parameters. Here we have a mixture of positive and negative results:
e.g., we proved fixed-parameter tractability for the parameter the number of
candidates but fixed-parameter intractability for the number of winners. For
single-peaked electorates our results are overwhelmingly positive: we provide
polynomial-time algorithms for most of the considered problems. The only rule
that remains NP-hard for single-peaked electorates is the classical Monroe
rule.
|
[
{
"created": "Tue, 4 Feb 2014 01:41:38 GMT",
"version": "v1"
}
] |
2014-02-05
|
[
[
"Betzler",
"Nadja",
""
],
[
"Slinko",
"Arkadii",
""
],
[
"Uhlmann",
"Johannes",
""
]
] |
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] |
1402.0581
|
Neal Andrew Snooke
|
Neal Andrew Snooke, Mark H Lee
|
Qualitative Order of Magnitude Energy-Flow-Based Failure Modes and
Effects Analysis
| null |
Journal Of Artificial Intelligence Research, Volume 46, pages
413-447, 2013
|
10.1613/jair.3898
| null |
cs.AI
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This paper presents a structured power and energy-flow-based qualitative
modelling approach that is applicable to a variety of system types including
electrical and fluid flow. The modelling is split into two parts. Power flow is
a global phenomenon and is therefore naturally represented and analysed by a
network comprised of the relevant structural elements from the components of a
system. The power flow analysis is a platform for higher-level behaviour
prediction of energy related aspects using local component behaviour models to
capture a state-based representation with a global time. The primary
application is Failure Modes and Effects Analysis (FMEA) and a form of
exaggeration reasoning is used, combined with an order of magnitude
representation to derive the worst case failure modes. The novel aspects of the
work are an order of magnitude(OM) qualitative network analyser to represent
any power domain and topology, including multiple power sources, a feature that
was not required for earlier specialised electrical versions of the approach.
Secondly, the representation of generalised energy related behaviour as
state-based local models is presented as a modelling strategy that can be more
vivid and intuitive for a range of topologically complex applications than
qualitative equation-based representations.The two-level modelling strategy
allows the broad system behaviour coverage of qualitative simulation to be
exploited for the FMEA task, while limiting the difficulties of qualitative
ambiguity explanation that can arise from abstracted numerical models. We have
used the method to support an automated FMEA system with examples of an
aircraft fuel system and domestic a heating system discussed in this paper.
|
[
{
"created": "Tue, 4 Feb 2014 01:41:55 GMT",
"version": "v1"
}
] |
2014-02-05
|
[
[
"Snooke",
"Neal Andrew",
""
],
[
"Lee",
"Mark H",
""
]
] |
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] |
1402.0582
|
Maliheh Aramon Bajestani
|
Maliheh Aramon Bajestani, J. Christopher Beck
|
Scheduling a Dynamic Aircraft Repair Shop with Limited Repair Resources
| null |
Journal Of Artificial Intelligence Research, Volume 47, pages
35-70, 2013
|
10.1613/jair.3902
| null |
cs.AI
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We address a dynamic repair shop scheduling problem in the context of
military aircraft fleet management where the goal is to maintain a full
complement of aircraft over the long-term. A number of flights, each with a
requirement for a specific number and type of aircraft, are already scheduled
over a long horizon. We need to assign aircraft to flights and schedule repair
activities while considering the flights requirements, repair capacity, and
aircraft failures. The number of aircraft awaiting repair dynamically changes
over time due to failures and it is therefore necessary to rebuild the repair
schedule online. To solve the problem, we view the dynamic repair shop as
successive static repair scheduling sub-problems over shorter time periods. We
propose a complete approach based on the logic-based Benders decomposition to
solve the static sub-problems, and design different rescheduling policies to
schedule the dynamic repair shop. Computational experiments demonstrate that
the Benders model is able to find and prove optimal solutions on average four
times faster than a mixed integer programming model. The rescheduling approach
having both aspects of scheduling over a longer horizon and quickly adjusting
the schedule increases aircraft available in the long term by 10% compared to
the approaches having either one of the aspects alone.
|
[
{
"created": "Tue, 4 Feb 2014 01:42:10 GMT",
"version": "v1"
}
] |
2014-02-05
|
[
[
"Bajestani",
"Maliheh Aramon",
""
],
[
"Beck",
"J. Christopher",
""
]
] |
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] |
1402.0583
|
Ludek Cigler
|
Ludek Cigler, Boi Faltings
|
Decentralized Anti-coordination Through Multi-agent Learning
| null |
Journal Of Artificial Intelligence Research, Volume 47, pages
441-473, 2013
|
10.1613/jair.3904
| null |
cs.GT cs.MA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
To achieve an optimal outcome in many situations, agents need to choose
distinct actions from one another. This is the case notably in many resource
allocation problems, where a single resource can only be used by one agent at a
time. How shall a designer of a multi-agent system program its identical agents
to behave each in a different way? From a game theoretic perspective, such
situations lead to undesirable Nash equilibria. For example consider a resource
allocation game in that two players compete for an exclusive access to a single
resource. It has three Nash equilibria. The two pure-strategy NE are efficient,
but not fair. The one mixed-strategy NE is fair, but not efficient. Aumanns
notion of correlated equilibrium fixes this problem: It assumes a correlation
device that suggests each agent an action to take. However, such a "smart"
coordination device might not be available. We propose using a randomly chosen,
"stupid" integer coordination signal. "Smart" agents learn which action they
should use for each value of the coordination signal. We present a multi-agent
learning algorithm that converges in polynomial number of steps to a correlated
equilibrium of a channel allocation game, a variant of the resource allocation
game. We show that the agents learn to play for each coordination signal value
a randomly chosen pure-strategy Nash equilibrium of the game. Therefore, the
outcome is an efficient correlated equilibrium. This CE becomes more fair as
the number of the available coordination signal values increases.
|
[
{
"created": "Tue, 4 Feb 2014 01:42:29 GMT",
"version": "v1"
}
] |
2014-02-05
|
[
[
"Cigler",
"Ludek",
""
],
[
"Faltings",
"Boi",
""
]
] |
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] |
1402.0584
|
Shaowei Cai
|
Shaowei Cai, Kaile Su, Chuan Luo, Abdul Sattar
|
NuMVC: An Efficient Local Search Algorithm for Minimum Vertex Cover
| null |
Journal Of Artificial Intelligence Research, Volume 46, pages
687-716, 2013
|
10.1613/jair.3907
| null |
cs.AI cs.DS
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The Minimum Vertex Cover (MVC) problem is a prominent NP-hard combinatorial
optimization problem of great importance in both theory and application. Local
search has proved successful for this problem. However, there are two main
drawbacks in state-of-the-art MVC local search algorithms. First, they select a
pair of vertices to exchange simultaneously, which is time-consuming. Secondly,
although using edge weighting techniques to diversify the search, these
algorithms lack mechanisms for decreasing the weights. To address these issues,
we propose two new strategies: two-stage exchange and edge weighting with
forgetting. The two-stage exchange strategy selects two vertices to exchange
separately and performs the exchange in two stages. The strategy of edge
weighting with forgetting not only increases weights of uncovered edges, but
also decreases some weights for each edge periodically. These two strategies
are used in designing a new MVC local search algorithm, which is referred to as
NuMVC. We conduct extensive experimental studies on the standard benchmarks,
namely DIMACS and BHOSLIB. The experiment comparing NuMVC with state-of-the-art
heuristic algorithms show that NuMVC is at least competitive with the nearest
competitor namely PLS on the DIMACS benchmark, and clearly dominates all
competitors on the BHOSLIB benchmark. Also, experimental results indicate that
NuMVC finds an optimal solution much faster than the current best exact
algorithm for Maximum Clique on random instances as well as some structured
ones. Moreover, we study the effectiveness of the two strategies and the
run-time behaviour through experimental analysis.
|
[
{
"created": "Tue, 4 Feb 2014 01:42:48 GMT",
"version": "v1"
}
] |
2014-02-05
|
[
[
"Cai",
"Shaowei",
""
],
[
"Su",
"Kaile",
""
],
[
"Luo",
"Chuan",
""
],
[
"Sattar",
"Abdul",
""
]
] |
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] | null | null | null | null | null | null | null |
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] |
1402.0585
|
Jose David Fernandez
|
Jose David Fernandez, Francisco Vico
|
AI Methods in Algorithmic Composition: A Comprehensive Survey
| null |
Journal Of Artificial Intelligence Research, Volume 48, pages
513-582, 2013
|
10.1613/jair.3908
| null |
cs.AI
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Algorithmic composition is the partial or total automation of the process of
music composition by using computers. Since the 1950s, different computational
techniques related to Artificial Intelligence have been used for algorithmic
composition, including grammatical representations, probabilistic methods,
neural networks, symbolic rule-based systems, constraint programming and
evolutionary algorithms. This survey aims to be a comprehensive account of
research on algorithmic composition, presenting a thorough view of the field
for researchers in Artificial Intelligence.
|
[
{
"created": "Tue, 4 Feb 2014 01:43:06 GMT",
"version": "v1"
}
] |
2014-02-05
|
[
[
"Fernandez",
"Jose David",
""
],
[
"Vico",
"Francisco",
""
]
] |
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] |
1402.0586
|
Shafiq Rayhan Joty
|
Shafiq Rayhan Joty, Giuseppe Carenini, Raymond T Ng
|
Topic Segmentation and Labeling in Asynchronous Conversations
| null |
Journal Of Artificial Intelligence Research, Volume 47, pages
521-573, 2013
|
10.1613/jair.3940
| null |
cs.CL
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Topic segmentation and labeling is often considered a prerequisite for
higher-level conversation analysis and has been shown to be useful in many
Natural Language Processing (NLP) applications. We present two new corpora of
email and blog conversations annotated with topics, and evaluate annotator
reliability for the segmentation and labeling tasks in these asynchronous
conversations. We propose a complete computational framework for topic
segmentation and labeling in asynchronous conversations. Our approach extends
state-of-the-art methods by considering a fine-grained structure of an
asynchronous conversation, along with other conversational features by applying
recent graph-based methods for NLP. For topic segmentation, we propose two
novel unsupervised models that exploit the fine-grained conversational
structure, and a novel graph-theoretic supervised model that combines lexical,
conversational and topic features. For topic labeling, we propose two novel
(unsupervised) random walk models that respectively capture conversation
specific clues from two different sources: the leading sentences and the
fine-grained conversational structure. Empirical evaluation shows that the
segmentation and the labeling performed by our best models beat the
state-of-the-art, and are highly correlated with human annotations.
|
[
{
"created": "Tue, 4 Feb 2014 01:43:35 GMT",
"version": "v1"
}
] |
2014-02-05
|
[
[
"Joty",
"Shafiq Rayhan",
""
],
[
"Carenini",
"Giuseppe",
""
],
[
"Ng",
"Raymond T",
""
]
] |
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] |
1402.0587
|
Tal Grinshpoun
|
Tal Grinshpoun, Alon Grubshtein, Roie Zivan, Arnon Netzer, Amnon
Meisels
|
Asymmetric Distributed Constraint Optimization Problems
| null |
Journal Of Artificial Intelligence Research, Volume 47, pages
613-647, 2013
|
10.1613/jair.3945
| null |
cs.AI
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Distributed Constraint Optimization (DCOP) is a powerful framework for
representing and solving distributed combinatorial problems, where the
variables of the problem are owned by different agents. Many multi-agent
problems include constraints that produce different gains (or costs) for the
participating agents. Asymmetric gains of constrained agents cannot be
naturally represented by the standard DCOP model. The present paper proposes a
general framework for Asymmetric DCOPs (ADCOPs). In ADCOPs different agents may
have different valuations for constraints that they are involved in. The new
framework bridges the gap between multi-agent problems which tend to have
asymmetric structure and the standard symmetric DCOP model. The benefits of the
proposed model over previous attempts to generalize the DCOP model are
discussed and evaluated. Innovative algorithms that apply to the special
properties of the proposed ADCOP model are presented in detail. These include
complete algorithms that have a substantial advantage in terms of runtime and
network load over existing algorithms (for standard DCOPs) which use
alternative representations. Moreover, standard incomplete algorithms (i.e.,
local search algorithms) are inapplicable to the existing DCOP representations
of asymmetric constraints and when they are applied to the new ADCOP framework
they often fail to converge to a local optimum and yield poor results. The
local search algorithms proposed in the present paper converge to high quality
solutions. The experimental evidence that is presented reveals that the
proposed local search algorithms for ADCOPs achieve high quality solutions
while preserving a high level of privacy.
|
[
{
"created": "Tue, 4 Feb 2014 01:43:59 GMT",
"version": "v1"
}
] |
2014-02-05
|
[
[
"Grinshpoun",
"Tal",
""
],
[
"Grubshtein",
"Alon",
""
],
[
"Zivan",
"Roie",
""
],
[
"Netzer",
"Arnon",
""
],
[
"Meisels",
"Amnon",
""
]
] |
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] |
1402.0588
|
Christer B\"ackstr\"om
|
Christer B\"ackstr\"om, Peter Jonsson
|
A Refined View of Causal Graphs and Component Sizes: SP-Closed Graph
Classes and Beyond
| null |
Journal Of Artificial Intelligence Research, Volume 47, pages
575-611, 2013
|
10.1613/jair.3968
| null |
cs.AI cs.DS
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The causal graph of a planning instance is an important tool for planning
both in practice and in theory. The theoretical studies of causal graphs have
largely analysed the computational complexity of planning for instances where
the causal graph has a certain structure, often in combination with other
parameters like the domain size of the variables. Chen and Gimand#233;nez
ignored even the structure and considered only the size of the weakly connected
components. They proved that planning is tractable if the components are
bounded by a constant and otherwise intractable. Their intractability result
was, however, conditioned by an assumption from parameterised complexity theory
that has no known useful relationship with the standard complexity classes. We
approach the same problem from the perspective of standard complexity classes,
and prove that planning is NP-hard for classes with unbounded components under
an additional restriction we refer to as SP-closed. We then argue that most
NP-hardness theorems for causal graphs are difficult to apply and, thus, prove
a more general result; even if the component sizes grow slowly and the class is
not densely populated with graphs, planning still cannot be tractable unless
the polynomial hierachy collapses. Both these results still hold when
restricted to the class of acyclic causal graphs. We finally give a partial
characterization of the borderline between NP-hard and NP-intermediate classes,
giving further insight into the problem.
|
[
{
"created": "Tue, 4 Feb 2014 01:44:34 GMT",
"version": "v1"
}
] |
2014-02-05
|
[
[
"Bäckström",
"Christer",
""
],
[
"Jonsson",
"Peter",
""
]
] |
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] |
1402.0589
|
Thomas L\'eaut\'e
|
Thomas Leaute, Boi Faltings
|
Protecting Privacy through Distributed Computation in Multi-agent
Decision Making
| null |
Journal Of Artificial Intelligence Research, Volume 47, pages
649-695, 2013
|
10.1613/jair.3983
| null |
cs.AI cs.CR cs.MA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
As large-scale theft of data from corporate servers is becoming increasingly
common, it becomes interesting to examine alternatives to the paradigm of
centralizing sensitive data into large databases. Instead, one could use
cryptography and distributed computation so that sensitive data can be supplied
and processed in encrypted form, and only the final result is made known. In
this paper, we examine how such a paradigm can be used to implement constraint
satisfaction, a technique that can solve a broad class of AI problems such as
resource allocation, planning, scheduling, and diagnosis. Most previous work on
privacy in constraint satisfaction only attempted to protect specific types of
information, in particular the feasibility of particular combinations of
decisions. We formalize and extend these restricted notions of privacy by
introducing four types of private information, including the feasibility of
decisions and the final decisions made, but also the identities of the
participants and the topology of the problem. We present distributed algorithms
that allow computing solutions to constraint satisfaction problems while
maintaining these four types of privacy. We formally prove the privacy
properties of these algorithms, and show experiments that compare their
respective performance on benchmark problems.
|
[
{
"created": "Tue, 4 Feb 2014 01:44:50 GMT",
"version": "v1"
},
{
"created": "Sat, 12 Jul 2014 22:20:22 GMT",
"version": "v2"
}
] |
2014-07-15
|
[
[
"Leaute",
"Thomas",
""
],
[
"Faltings",
"Boi",
""
]
] |
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] |
1402.0590
|
Diederik Marijn Roijers
|
Diederik Marijn Roijers, Peter Vamplew, Shimon Whiteson, Richard
Dazeley
|
A Survey of Multi-Objective Sequential Decision-Making
| null |
Journal Of Artificial Intelligence Research, Volume 48, pages
67-113, 2013
|
10.1613/jair.3987
| null |
cs.AI
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Sequential decision-making problems with multiple objectives arise naturally
in practice and pose unique challenges for research in decision-theoretic
planning and learning, which has largely focused on single-objective settings.
This article surveys algorithms designed for sequential decision-making
problems with multiple objectives. Though there is a growing body of literature
on this subject, little of it makes explicit under what circumstances special
methods are needed to solve multi-objective problems. Therefore, we identify
three distinct scenarios in which converting such a problem to a
single-objective one is impossible, infeasible, or undesirable. Furthermore, we
propose a taxonomy that classifies multi-objective methods according to the
applicable scenario, the nature of the scalarization function (which projects
multi-objective values to scalar ones), and the type of policies considered. We
show how these factors determine the nature of an optimal solution, which can
be a single policy, a convex hull, or a Pareto front. Using this taxonomy, we
survey the literature on multi-objective methods for planning and learning.
Finally, we discuss key applications of such methods and outline opportunities
for future work.
|
[
{
"created": "Tue, 4 Feb 2014 01:45:08 GMT",
"version": "v1"
}
] |
2014-02-05
|
[
[
"Roijers",
"Diederik Marijn",
""
],
[
"Vamplew",
"Peter",
""
],
[
"Whiteson",
"Shimon",
""
],
[
"Dazeley",
"Richard",
""
]
] |
[
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] |
1402.0591
|
Paulo Roberto Costa
|
Paulo Roberto Costa, Lu\'is Miguel Botelho
|
Learning by Observation of Agent Software Images
| null |
Journal Of Artificial Intelligence Research, Volume 47, pages
313-349, 2013
|
10.1613/jair.3989
| null |
cs.AI cs.MA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Learning by observation can be of key importance whenever agents sharing
similar features want to learn from each other. This paper presents an agent
architecture that enables software agents to learn by direct observation of the
actions executed by expert agents while they are performing a task. This is
possible because the proposed architecture displays information that is
essential for observation, making it possible for software agents to observe
each other. The agent architecture supports a learning process that covers all
aspects of learning by observation, such as discovering and observing experts,
learning from the observed data, applying the acquired knowledge and evaluating
the agents progress. The evaluation provides control over the decision to
obtain new knowledge or apply the acquired knowledge to new problems. We
combine two methods for learning from the observed information. The first one,
the recall method, uses the sequence on which the actions were observed to
solve new problems. The second one, the classification method, categorizes the
information in the observed data and determines to which set of categories the
new problems belong. Results show that agents are able to learn in conditions
where common supervised learning algorithms fail, such as when agents do not
know the results of their actions a priori or when not all the effects of the
actions are visible. The results also show that our approach provides better
results than other learning methods since it requires shorter learning periods.
|
[
{
"created": "Tue, 4 Feb 2014 01:45:26 GMT",
"version": "v1"
}
] |
2014-02-05
|
[
[
"Costa",
"Paulo Roberto",
""
],
[
"Botelho",
"Luís Miguel",
""
]
] |
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] |
1402.0595
|
Mojtaba Seyedhosseini
|
Mojtaba Seyedhosseini and Tolga Tasdizen
|
Scene Labeling with Contextual Hierarchical Models
| null | null | null | null |
cs.CV
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Scene labeling is the problem of assigning an object label to each pixel. It
unifies the image segmentation and object recognition problems. The importance
of using contextual information in scene labeling frameworks has been widely
realized in the field. We propose a contextual framework, called contextual
hierarchical model (CHM), which learns contextual information in a hierarchical
framework for scene labeling. At each level of the hierarchy, a classifier is
trained based on downsampled input images and outputs of previous levels. Our
model then incorporates the resulting multi-resolution contextual information
into a classifier to segment the input image at original resolution. This
training strategy allows for optimization of a joint posterior probability at
multiple resolutions through the hierarchy. Contextual hierarchical model is
purely based on the input image patches and does not make use of any fragments
or shape examples. Hence, it is applicable to a variety of problems such as
object segmentation and edge detection. We demonstrate that CHM outperforms
state-of-the-art on Stanford background and Weizmann horse datasets. It also
outperforms state-of-the-art edge detection methods on NYU depth dataset and
achieves state-of-the-art on Berkeley segmentation dataset (BSDS 500).
|
[
{
"created": "Tue, 4 Feb 2014 02:10:01 GMT",
"version": "v1"
}
] |
2014-02-05
|
[
[
"Seyedhosseini",
"Mojtaba",
""
],
[
"Tasdizen",
"Tolga",
""
]
] |
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] |
1402.0599
|
Duo Han
|
Duo Han, Yilin Mo, Junfeng Wu, Sean Weerakkody, Bruno Sinopoli, Ling
Shi
|
Stochastic Event-triggered Sensor Schedule for Remote State Estimation
| null |
IEEE Trans. Autom. Control, pp. 2661 - 2675, vol 60, issue 10,
2015
|
10.1109/TAC.2015.2406975
| null |
cs.IT math.IT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose an open-loop and a closed-loop stochastic event-triggered sensor
schedule for remote state estimation. Both schedules overcome the essential
difficulties of existing schedules in recent literature works where, through
introducing a deterministic event-triggering mechanism, the Gaussian property
of the innovation process is destroyed which produces a challenging nonlinear
filtering problem that cannot be solved unless approximation techniques are
adopted. The proposed stochastic event-triggered sensor schedules eliminate
such approximations. Under these two schedules, the MMSE estimator and its
estimation error covariance matrix at the remote estimator are given in a
closed-form. Simulation studies demonstrate that the proposed schedules have
better performance than periodic ones with the same sensor-to-estimator
communication rate.
|
[
{
"created": "Tue, 4 Feb 2014 02:54:23 GMT",
"version": "v1"
}
] |
2016-04-27
|
[
[
"Han",
"Duo",
""
],
[
"Mo",
"Yilin",
""
],
[
"Wu",
"Junfeng",
""
],
[
"Weerakkody",
"Sean",
""
],
[
"Sinopoli",
"Bruno",
""
],
[
"Shi",
"Ling",
""
]
] |
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] |
1402.0601
|
Chenyi Zhang
|
Franck Cassez, Ron van der Meyden and Chenyi Zhang
|
The Complexity of Synchronous Notions of Information Flow Security
|
Extended version of a paper in FOSSACS'10 with all proofs included
| null | null | null |
cs.CR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The paper considers the complexity of verifying that a finite state system
satisfies a number of definitions of information flow security. The systems
model considered is one in which agents operate synchronously with awareness of
the global clock. This enables timing based attacks to be captured, whereas
previous work on this topic has dealt primarily with asynchronous systems.
Versions of the notions of nondeducibility on inputs, nondeducibility on
strategies, and an unwinding based notion are formulated for this model. All
three notions are shown to be decidable, and their computational complexity is
characterised.
|
[
{
"created": "Tue, 4 Feb 2014 03:23:17 GMT",
"version": "v1"
}
] |
2014-02-05
|
[
[
"Cassez",
"Franck",
""
],
[
"van der Meyden",
"Ron",
""
],
[
"Zhang",
"Chenyi",
""
]
] |
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] |
1402.0608
|
Victoria Kostina
|
Victoria Kostina, Yury Polyanskiy, Sergio Verd\'u
|
Variable-length compression allowing errors
| null |
IEEE Transactions on Information Theory, vol. 61, no. 9, pp.
4316-4330, Aug. 2015
| null | null |
cs.IT math.IT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This paper studies the fundamental limits of the minimum average length of
lossless and lossy variable-length compression, allowing a nonzero error
probability $\epsilon$, for lossless compression. We give non-asymptotic bounds
on the minimum average length in terms of Erokhin's rate-distortion function
and we use those bounds to obtain a Gaussian approximation on the speed of
approach to the limit which is quite accurate for all but small blocklengths:
$$(1 - \epsilon) k H(\mathsf S) - \sqrt{\frac{k V(\mathsf S)}{2 \pi} } e^{-
\frac {(Q^{-1}(\epsilon))^2} 2 }$$ where $Q^{-1}(\cdot)$ is the functional
inverse of the standard Gaussian complementary cdf, and $V(\mathsf S)$ is the
source dispersion. A nonzero error probability thus not only reduces the
asymptotically achievable rate by a factor of $1 - \epsilon$, but this
asymptotic limit is approached from below, i.e. larger source dispersions and
shorter blocklengths are beneficial. Variable-length lossy compression under an
excess distortion constraint is shown to exhibit similar properties.
|
[
{
"created": "Tue, 4 Feb 2014 03:42:05 GMT",
"version": "v1"
},
{
"created": "Fri, 30 May 2014 17:28:27 GMT",
"version": "v2"
},
{
"created": "Thu, 8 Oct 2015 02:58:58 GMT",
"version": "v3"
}
] |
2015-10-09
|
[
[
"Kostina",
"Victoria",
""
],
[
"Polyanskiy",
"Yury",
""
],
[
"Verdú",
"Sergio",
""
]
] |
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] |
1402.0614
|
Jingwen Bai
|
Jingwen Bai, Chris Dick and Ashutosh Sabharwal
|
Vector Bin-and-Cancel for MIMO Distributed Full-Duplex
|
60 pages, Submitted to IEEE Transactions on Information Theory (under
revision), Jan 2014
| null | null | null |
cs.IT math.IT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In a multi-input multi-output (MIMO) full-duplex network, where an in-band
full-duplex infrastruc- ture node communicates with two half-duplex mobiles
supporting simultaneous up- and downlink flows, the inter-mobile interference
between the up- and downlink mobiles limits the system performance. We study
the impact of leveraging an out-of-band side-channel between mobiles in such
network under different channel models. For time-invariant channels, we aim to
characterize the generalized degrees- of-freedom (GDoF) of the side-channel
assisted MIMO full-duplex network. For slow-fading channels, we focus on the
diversity-multiplexing tradeoff (DMT) of the system with various assumptions as
to the availability of channel state information at the transmitter (CSIT). The
key to the optimal performance is a vector bin-and-cancel strategy leveraging
Han-Kobayashi message splitting, which is shown to achieve the system capacity
region to within a constant bit. We quantify how the side-channel improve the
GDoF and DMT compared to a system without the extra orthogonal spectrum. The
insights gained from our analysis reveal: i) the tradeoff between spatial
resources from multiple antennas at different nodes and spectral resources of
the side-channel, and ii) the interplay between the channel uncertainty at the
transmitter and use of the side-channel.
|
[
{
"created": "Tue, 4 Feb 2014 04:14:16 GMT",
"version": "v1"
},
{
"created": "Tue, 13 May 2014 17:12:39 GMT",
"version": "v2"
},
{
"created": "Fri, 16 Jan 2015 19:10:54 GMT",
"version": "v3"
}
] |
2015-01-19
|
[
[
"Bai",
"Jingwen",
""
],
[
"Dick",
"Chris",
""
],
[
"Sabharwal",
"Ashutosh",
""
]
] |
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] |
1402.0621
|
Jack Ng
|
Jun Chen, Jack Ng, Kun Ding, Kin Hung Fung, Zhifang Lin, and C. T.
Chan
|
Negative Optical Torque
|
15 pages, 3 figures
| null | null | null |
physics.optics
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Maxwell noted that light carries angular momentum, and as such it can exert
torques on material objects. This was subsequently proved by Beth in 1936.
Applications of these opto-mechanical effects were limited initially due to
their smallness in magnitude, but later enabled by the invention of laser.
Novel and practical approaches for harvesting light for particle rotation have
been demonstrated, where the structure is subjected to a positive optical
torque along a certain axis21 if the incident angular momentum has a positive
projection on the same axis. We report here a counter-intuitive phenomenon of
negative optical torque, meaning that incoming photons carrying angular
momentum rotate an object in the opposite sense. Surprisingly this can be
realized quite straightforwardly in simple planar structures. Field retardation
is a necessary condition. The optimal conditions are explored and explained.
|
[
{
"created": "Tue, 4 Feb 2014 05:49:02 GMT",
"version": "v1"
}
] |
2014-02-05
|
[
[
"Chen",
"Jun",
""
],
[
"Ng",
"Jack",
""
],
[
"Ding",
"Kun",
""
],
[
"Fung",
"Kin Hung",
""
],
[
"Lin",
"Zhifang",
""
],
[
"Chan",
"C. T.",
""
]
] |
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] |
1402.0622
|
Adam Strzebonski
|
Adam Strzebonski
|
Divide-And-Conquer Computation of Cylindrical Algebraic Decomposition
| null | null | null | null |
cs.SC cs.MS
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a divide-and-conquer version of the Cylindrical Algebraic
Decomposition (CAD) algorithm. The algorithm represents the input as a Boolean
combination of subformulas, computes cylindrical algebraic decompositions of
solution sets of the subformulas, and combines the results. We propose a
graph-based heuristic to find a suitable partitioning of the input and present
empirical comparison with direct CAD computation.
|
[
{
"created": "Tue, 4 Feb 2014 05:52:47 GMT",
"version": "v1"
}
] |
2014-02-05
|
[
[
"Strzebonski",
"Adam",
""
]
] |
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] |
1402.0629
|
Ketan Rathod
|
K. D. Rathod and Vasant Natarajan
|
Ramsey fringes in a thermal beam of Yb atoms
|
5 pages, 5 figures
|
Current Science Vol. 109 Issue 3, p592-595. 4p. 10/8/2015
| null | null |
physics.atom-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We use the Ramsey separated oscillatory fields (SOF) technique in a
$400^\circ$C thermal beam of Yb atoms to measure the Larmor precession
frequency with high precision. For the experiment, we use the strongly-allowed
${^1S_0} \rightarrow {^1P_1}$ transition at $399$ nm, and choose the odd
isotope $^{171}$Yb with nuclear spin $I=1/2$, so that the ground state has only
two magnetic sublevels $m_F = \pm 1/2$. With a magnetic field of $22.2$ G and a
separation of about $400$ mm between the oscillatory fields, the central Ramsey
fringe is at $16.64$ kHz and has a width of $350$ Hz. The technique can be
readily adapted to a cold atomic beam, and should be useful in experiments
searching for a permanent electric dipole moment (EDM) in atoms.
|
[
{
"created": "Tue, 4 Feb 2014 06:13:25 GMT",
"version": "v1"
}
] |
2015-10-08
|
[
[
"Rathod",
"K. D.",
""
],
[
"Natarajan",
"Vasant",
""
]
] |
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] |
1402.0630
|
Shafi'i Abdulhamid Mr
|
Shafii Muhammad Abdulhamid, Fasilat Folagbayo Ibrahim
|
Controlling Citizens Cyber Viewing Using Enhanced Internet Content
Filters
|
8 pages
|
I.J. Information Technology and Computer Science, 2013, 12, 56-63
| null | null |
cs.CY
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Information passing through internet is generally unrestricted and
uncontrollable and a good web content filter acts very much like a sieve. This
paper looks at how citizens internet viewing can be controlled using content
filters to prevent access to illegal sites and malicious contents in Nigeria.
Primary data were obtained by administering 100 questionnaires. The data was
analyzed by a software package called Statistical Package for Social Sciences
(SPSS). The result of the study shows that 66.4% of the respondents agreed that
the internet is been abused and the abuse can be controlled by the use of
content filters. The PHP, MySQL and Apache were used to design a content filter
program. It was recommended that a lot still need to be done by public
organizations, academic institutions, government and its agencies especially
the Economic and Financial Crime Commission (EFCC) in Nigeria to control the
internet abuse by the under aged and criminals.
|
[
{
"created": "Tue, 4 Feb 2014 06:25:34 GMT",
"version": "v1"
}
] |
2014-02-05
|
[
[
"Abdulhamid",
"Shafii Muhammad",
""
],
[
"Ibrahim",
"Fasilat Folagbayo",
""
]
] |
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] |
1402.0631
|
Sanjay Bhalgama
|
S.R.Bhalgama, C.C.Kavar, S.S.Parmar
|
LWRP: Low Power Consumption Weighting Replacement Policy using Buffer
Memory
|
4 pages, 2 figures, Published with International Journal of Computer
Trends and Technology (IJCTT)
|
IJCTT 7(3):147-150, January 2014. Published by Seventh Sense
Research Group
|
10.14445/22312803/IJCTT-V7P142
| null |
cs.OS
|
http://creativecommons.org/licenses/by/3.0/
|
As the performance gap between memory and processors has increased, then it
leads to the poor performance. Efficient virtual memory can overcome this
problem. And the efficiency of virtual memory depends on the replacement policy
used for cache. In this paper, our algorithm not only based on the time to last
access and frequency index but, we also consider the power consumption. We show
that Low Power Consumption Weighting Replacement Policy (LWRP) has better
performance and low power consumption.
|
[
{
"created": "Tue, 4 Feb 2014 06:26:34 GMT",
"version": "v1"
}
] |
2014-02-05
|
[
[
"Bhalgama",
"S. R.",
""
],
[
"Kavar",
"C. C.",
""
],
[
"Parmar",
"S. S.",
""
]
] |
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] |
1402.0635
|
Ian Osband
|
Ian Osband, Benjamin Van Roy, Zheng Wen
|
Generalization and Exploration via Randomized Value Functions
|
arXiv admin note: text overlap with arXiv:1307.4847
| null | null | null |
stat.ML cs.AI cs.LG cs.SY
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose randomized least-squares value iteration (RLSVI) -- a new
reinforcement learning algorithm designed to explore and generalize efficiently
via linearly parameterized value functions. We explain why versions of
least-squares value iteration that use Boltzmann or epsilon-greedy exploration
can be highly inefficient, and we present computational results that
demonstrate dramatic efficiency gains enjoyed by RLSVI. Further, we establish
an upper bound on the expected regret of RLSVI that demonstrates
near-optimality in a tabula rasa learning context. More broadly, our results
suggest that randomized value functions offer a promising approach to tackling
a critical challenge in reinforcement learning: synthesizing efficient
exploration and effective generalization.
|
[
{
"created": "Tue, 4 Feb 2014 06:41:59 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Jul 2015 23:11:02 GMT",
"version": "v2"
},
{
"created": "Mon, 15 Feb 2016 10:20:11 GMT",
"version": "v3"
}
] |
2016-02-16
|
[
[
"Osband",
"Ian",
""
],
[
"Van Roy",
"Benjamin",
""
],
[
"Wen",
"Zheng",
""
]
] |
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] |
Generalization and Exploration via Randomized Value Functions
|
http://arxiv.org/abs/1402.0635v3
|
http://arxiv.org/pdf/1402.0635v3.pdf
|
https://github.com/qdevpsi3/randomized-value-iteration
| false | false |
https://paperswithcode.com/paper/generalization-and-exploration-via-randomized
|
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] |
1402.0642
|
Thomas Wentworth
|
Thomas Wentworth and Ilse Ipsen
|
kappa_SQ: A Matlab package for randomized sampling of matrices with
orthonormal columns
|
Kappa_SQ can be downloaded from :
http://www4.ncsu.edu/~tawentwo/kappaSQ_02042014.zip
| null | null | null |
math.NA cs.NA
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The kappa_SQ software package is designed to assist researchers working on
randomized row sampling. The package contains a collection of Matlab functions
along with a GUI that ties them all together and provides a platform for the
user to perform experiments. In particular, kappa_SQ is designed to do
experiments related to the two-norm condition number of a sampled matrix,
$\kappa(SQ)$, where $S$ is a row sampling matrix and $Q$ is a tall and skinny
matrix with orthonormal columns. Via a simple GUI, kappa_SQ can generate test
matrices, perform various types of row sampling, measure $\kappa(SQ)$,
calculate bounds and produce high quality plots of the results. All of the
important codes are written in separate Matlab function files in a standard
format which makes it easy for a user to either use the codes by themselves or
incorporate their own codes into the kappa_SQ package.
|
[
{
"created": "Tue, 4 Feb 2014 07:17:01 GMT",
"version": "v1"
}
] |
2014-02-05
|
[
[
"Wentworth",
"Thomas",
""
],
[
"Ipsen",
"Ilse",
""
]
] |
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] |
1402.0643
|
Vincent Neiger
|
Muhammad F. I. Chowdhury (ORCCA), Claude-Pierre Jeannerod (LIP, Inria
Grenoble Rh\^one-Alpes / LIP Laboratoire de l'Informatique du
Parall\'elisme), Vincent Neiger (ORCCA, LIP, Inria Grenoble Rh\^one-Alpes /
LIP Laboratoire de l'Informatique du Parall\'elisme), Eric Schost (ORCCA),
Gilles Villard (LIP, Inria Grenoble Rh\^one-Alpes / LIP Laboratoire de
l'Informatique du Parall\'elisme)
|
Faster Algorithms for Multivariate Interpolation with Multiplicities and
Simultaneous Polynomial Approximations
|
Version 2: Generalized our results about Problem 1 to distinct
multiplicities. Added Section 4 which details several applications of our
results to the decoding of Reed-Solomon codes (list-decoding with re-encoding
technique, Wu algorithm, and soft-decoding). Reorganized the sections, added
references and corrected typos
| null | null | null |
cs.IT cs.SC math.IT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The interpolation step in the Guruswami-Sudan algorithm is a bivariate
interpolation problem with multiplicities commonly solved in the literature
using either structured linear algebra or basis reduction of polynomial
lattices. This problem has been extended to three or more variables; for this
generalization, all fast algorithms proposed so far rely on the lattice
approach. In this paper, we reduce this multivariate interpolation problem to a
problem of simultaneous polynomial approximations, which we solve using fast
structured linear algebra. This improves the best known complexity bounds for
the interpolation step of the list-decoding of Reed-Solomon codes,
Parvaresh-Vardy codes, and folded Reed-Solomon codes. In particular, for
Reed-Solomon list-decoding with re-encoding, our approach has complexity
$\mathcal{O}\tilde{~}(\ell^{\omega-1}m^2(n-k))$, where $\ell,m,n,k$ are the
list size, the multiplicity, the number of sample points and the dimension of
the code, and $\omega$ is the exponent of linear algebra; this accelerates the
previously fastest known algorithm by a factor of $\ell / m$.
|
[
{
"created": "Tue, 4 Feb 2014 07:23:14 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Feb 2015 16:26:30 GMT",
"version": "v2"
}
] |
2015-02-16
|
[
[
"Chowdhury",
"Muhammad F. I.",
"",
"ORCCA"
],
[
"Jeannerod",
"Claude-Pierre",
"",
"LIP, Inria\n Grenoble Rhône-Alpes / LIP Laboratoire de l'Informatique du\n Parallélisme"
],
[
"Neiger",
"Vincent",
"",
"ORCCA, LIP, Inria Grenoble Rhône-Alpes /\n LIP Laboratoire de l'Informatique du Parallélisme"
],
[
"Schost",
"Eric",
"",
"ORCCA"
],
[
"Villard",
"Gilles",
"",
"LIP, Inria Grenoble Rhône-Alpes / LIP Laboratoire de\n l'Informatique du Parallélisme"
]
] |
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] |
1402.0645
|
Franziska Meier
|
Franziska Meier and Philipp Hennig and Stefan Schaal
|
Local Gaussian Regression
| null | null | null | null |
cs.LG cs.RO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Locally weighted regression was created as a nonparametric learning method
that is computationally efficient, can learn from very large amounts of data
and add data incrementally. An interesting feature of locally weighted
regression is that it can work with spatially varying length scales, a
beneficial property, for instance, in control problems. However, it does not
provide a generative model for function values and requires training and test
data to be generated identically, independently. Gaussian (process) regression,
on the other hand, provides a fully generative model without significant formal
requirements on the distribution of training data, but has much higher
computational cost and usually works with one global scale per input dimension.
Using a localising function basis and approximate inference techniques, we take
Gaussian (process) regression to increasingly localised properties and toward
the same computational complexity class as locally weighted regression.
|
[
{
"created": "Tue, 4 Feb 2014 07:35:48 GMT",
"version": "v1"
}
] |
2014-02-05
|
[
[
"Meier",
"Franziska",
""
],
[
"Hennig",
"Philipp",
""
],
[
"Schaal",
"Stefan",
""
]
] |
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] |
1402.0648
|
Abhik Das
|
Abhik Kumar Das, Siddhartha Banerjee, Sriram Vishwanath
|
Linear Network Coding for Multiple Groupcast Sessions: An Interference
Alignment Approach
|
5 pages, appeared in ITW 2013
| null | null | null |
cs.IT math.IT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider the problem of linear network coding over communication networks,
representable by directed acyclic graphs, with multiple groupcast sessions: the
network comprises of multiple destination nodes, each desiring messages from
multiple sources. We adopt an interference alignment perspective, providing new
insights into designing practical network coding schemes as well as the impact
of network topology on the complexity of the alignment scheme. In particular,
we show that under certain (polynomial-time checkable) constraints on networks
with $K$ sources, it is possible to achieve a rate of $1/(L+d+1)$ per source
using linear network coding coupled with interference alignment, where each
destination receives messages from $L$ sources ($L < K$), and $d$ is a
parameter, solely dependent on the network topology, that satisfies $0 \leq d <
K-L$.
|
[
{
"created": "Tue, 4 Feb 2014 07:42:08 GMT",
"version": "v1"
}
] |
2014-02-05
|
[
[
"Das",
"Abhik Kumar",
""
],
[
"Banerjee",
"Siddhartha",
""
],
[
"Vishwanath",
"Sriram",
""
]
] |
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] |
1402.0649
|
Joni Pajarinen
|
Joni Pajarinen and Ville Kyrki
|
Robotic manipulation of multiple objects as a POMDP
| null | null | null | null |
cs.RO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This paper investigates manipulation of multiple unknown objects in a crowded
environment. Because of incomplete knowledge due to unknown objects and
occlusions in visual observations, object observations are imperfect and action
success is uncertain, making planning challenging. We model the problem as a
partially observable Markov decision process (POMDP), which allows a general
reward based optimization objective and takes uncertainty in temporal evolution
and partial observations into account. In addition to occlusion dependent
observation and action success probabilities, our POMDP model also
automatically adapts object specific action success probabilities. To cope with
the changing system dynamics and performance constraints, we present a new
online POMDP method based on particle filtering that produces compact policies.
The approach is validated both in simulation and in physical experiments in a
scenario of moving dirty dishes into a dishwasher. The results indicate that:
1) a greedy heuristic manipulation approach is not sufficient, multi-object
manipulation requires multi-step POMDP planning, and 2) on-line planning is
beneficial since it allows the adaptation of the system dynamics model based on
actual experience.
|
[
{
"created": "Tue, 4 Feb 2014 07:49:49 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Jul 2014 10:33:45 GMT",
"version": "v2"
}
] |
2014-07-09
|
[
[
"Pajarinen",
"Joni",
""
],
[
"Kyrki",
"Ville",
""
]
] |
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] |
1402.0654
|
Constantinos Simserides Prof.
|
Constantinos Simserides
|
A systematic study of electron or hole transfer along DNA dimers,
trimers and polymers
|
16 pages, 7 figures, 4 tables. arXiv admin note: text overlap with
arXiv:1312.6842
|
Chemical Physics 440 (2014) 31-41
|
10.1016/j.chemphys.2014.05.024
| null |
physics.bio-ph q-bio.BM
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A systematic study of electron or hole transfer along DNA dimers, trimers and
polymers is presented with a tight-binding approach at the base-pair level,
using the relevant on-site energies of the base-pairs and the hopping
parameters between successive base-pairs. A system of $N$ coupled differential
equations is solved numerically with the eigenvalue method, allowing the
temporal and spatial evolution of electrons or holes along a $N$ base-pair DNA
segment to be determined. Useful physical quantities are defined and calculated
including the maximum transfer percentage $p$ and the pure maximum transfer
rate $\frac{p}{T}$ for cases where a period $T$ can be defined, as well as the
pure mean carrier transfer rate $k$ and the speed of charge transfer $u=kd$,
where $d = N \times$ 3.4 {\AA} is the charge transfer distance. The inverse
decay length $\beta$ used for the exponential fit $k = k_0 \exp(-\beta d)$ and
the exponent $\eta$ used for the power law fit $k = k_0' N^{-\eta}$ are
computed. The electron and hole transfer along polymers including
poly(dG)-poly(dC), poly(dA)-poly(dT), GCGCGC..., ATATAT... is studied, too.
$\beta$ falls in the range $\approx$ 0.2-2 {\AA}$^{-1}$, $k_0$ is usually
10$^{-2}$-10$^{-1}$ PHz although, generally, it falls in the wider range
10$^{-4}$-10 PHz. $\eta$ falls in the range $\approx$ 1.7-17, $k_0'$ is usually
$\approx 10^{-2}$-10$^{-1}$ PHz, although generally, it falls in the wider
range $\approx10^{-4}$-10$^3$ PHz. Finally, the results are compared with the
predictions of Wang et al. Phys. Rev. Lett. 93, (2004) 016401, as well as
experiments, including Murphy et al. Science 262, 1025 (1993); Arkin et al.
Science 273, 475 (1996); Giese et al. Angew. Chem. Int. Ed. 38, 996 (1999);
Giese et al. Nature 412, 318 (2001). This method allows to assess the extent at
which a specific DNA segment can serve as an efficient medium for charge
transfer.
|
[
{
"created": "Tue, 4 Feb 2014 08:27:36 GMT",
"version": "v1"
}
] |
2014-06-30
|
[
[
"Simserides",
"Constantinos",
""
]
] |
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] |
1402.0660
|
Guoming Wang
|
Guoming Wang
|
Quantum Algorithm for Linear Regression
|
22 pages, no figure. Final version
|
Phys. Rev. A 96, 012335 (2017)
|
10.1103/PhysRevA.96.012335
| null |
quant-ph cs.DS
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a quantum algorithm for fitting a linear regression model to a
given data set using the least squares approach. Different from previous
algorithms which yield a quantum state encoding the optimal parameters, our
algorithm outputs these numbers in the classical form. So by running it once,
one completely determines the fitted model and then can use it to make
predictions on new data at little cost. Moreover, our algorithm works in the
standard oracle model, and can handle data sets with nonsparse design matrices.
It runs in time $\operatorname{poly}(\operatorname{log}(N), d, \kappa,
1/\epsilon)$, where $N$ is the size of the data set, $d$ is the number of
adjustable parameters, $\kappa$ is the condition number of the design matrix,
and $\epsilon$ is the desired precision in the output. We also show that the
polynomial dependence on $d$ and $\kappa$ is necessary. Thus, our algorithm
cannot be significantly improved. Furthermore, we also give a quantum algorithm
that estimates the quality of the least-squares fit (without computing its
parameters explicitly). This algorithm runs faster than the one for finding
this fit, and can be used to check whether the given data set qualifies for
linear regression in the first place.
|
[
{
"created": "Tue, 4 Feb 2014 08:55:07 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Feb 2014 08:11:29 GMT",
"version": "v2"
},
{
"created": "Wed, 2 Apr 2014 04:56:36 GMT",
"version": "v3"
},
{
"created": "Mon, 6 Mar 2017 22:22:08 GMT",
"version": "v4"
},
{
"created": "Wed, 12 Jul 2017 21:17:29 GMT",
"version": "v5"
},
{
"created": "Mon, 31 Jul 2017 14:50:08 GMT",
"version": "v6"
}
] |
2017-08-01
|
[
[
"Wang",
"Guoming",
""
]
] |
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] |
1402.0670
|
Roshan Ragel
|
B.A.N.M. Bambarasinghe, H.M.S. Huruggamuwa, R.G. Ragel and S.
Radhakrishnan
|
Axis2UNO: Web Services Enabled Openoffice.org
|
6 pages, 4th International Conference on Information and Automation
for Sustainability, 2008. ICIAFS 2008
|
ICIAFS 2008. 437-442, 12-14 Dec. 2008
|
10.1109/ICIAFS.2008.4783956
| null |
cs.SE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Openoffice.org is a popular, free and open source office product. This
product is used by millions of people and developed, maintained and extended by
thousands of developers worldwide. Playing a dominant role in the web, web
services technology is serving millions of people every day. Axis2 is one of
the most popular, free and open source web service engines. The framework
presented in this paper, Axis2UNO, a combination of such two technologies is
capable of making a new era in office environment. Two other attempts to
enhance web services functionality in office products are Excel Web Services
and UNO Web Service Proxy. Excel Web Services is combined with Microsoft
SharePoint technology and exposes information sharing in a different
perspective within the proprietary Microsoft office products. UNO Web Service
Proxy is implemented with Java Web Services Developer Pack and enables basic
web services related functionality in Openoffice.org. However, the work
presented here is the first one to combine Openoffice.org and Axis2 and we
expect it to outperform the other efforts with the community involvement and
feature richness in those products.
|
[
{
"created": "Tue, 4 Feb 2014 09:31:51 GMT",
"version": "v1"
}
] |
2014-02-05
|
[
[
"Bambarasinghe",
"B. A. N. M.",
""
],
[
"Huruggamuwa",
"H. M. S.",
""
],
[
"Ragel",
"R. G.",
""
],
[
"Radhakrishnan",
"S.",
""
]
] |
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] |
1402.0671
|
Roshan Ragel
|
Rajitha Navarathna, Swarnalatha Radhakrishnan and Roshan Ragel
|
Loop Unrolling in Multi-pipeline ASIP Design
|
6 pages
|
Navarathna, H. M R D B; Radhakrishnan, S.; Ragel, R.G., "Loop
unrolling in multi-pipeline ASIP design," Industrial and Information Systems
(ICIIS), 2009 International Conference on , pp.306-311, 28-31 Dec. 2009
|
10.1109/ICIINFS.2009.5429845
| null |
cs.PL
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Application Specific Instruction-set Processor (ASIP) is one of the popular
processor design techniques for embedded systems which allows customizability
in processor design without overly hindering design flexibility. Multi-pipeline
ASIPs were proposed to improve the performance of such systems by compromising
between speed and processor area. One of the problems in the multi-pipeline
design is the limited inherent instruction level parallelism (ILP) available in
applications. The ILP of application programs can be improved via a compiler
optimization technique known as loop unrolling. In this paper, we present how
loop unrolling effects the performance of multi-pipeline ASIPs. The
improvements in performance average around 15% for a number of benchmark
applications with the maximum improvement of around 30%. In addition, we
analyzed the variable of performance against loop unrolling factor, which is
the amount of unrolling we perform.
|
[
{
"created": "Tue, 4 Feb 2014 09:36:34 GMT",
"version": "v1"
}
] |
2014-02-05
|
[
[
"Navarathna",
"Rajitha",
""
],
[
"Radhakrishnan",
"Swarnalatha",
""
],
[
"Ragel",
"Roshan",
""
]
] |
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] |
1402.0672
|
Roshan Ragel
|
A. K. B. Karunathilake, B. M. D. Balasuriya and R. G. Ragel
|
User Friendly Line CAPTCHAs
|
6 pages
|
Industrial and Information Systems (ICIIS), 2009 International
Conference on , pp.210,215, 28-31 Dec. 2009
|
10.1109/ICIINFS.2009.5429864
| null |
cs.HC cs.AI
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
CAPTCHAs or reverse Turing tests are real-time assessments used by programs
(or computers) to tell humans and machines apart. This is achieved by assigning
and assessing hard AI problems that could only be solved easily by human but
not by machines. Applications of such assessments range from stopping spammers
from automatically filling online forms to preventing hackers from performing
dictionary attack. Today, the race between makers and breakers of CAPTCHAs is
at a juncture, where the CAPTCHAs proposed are not even answerable by humans.
We consider such CAPTCHAs as non user friendly. In this paper, we propose a
novel technique for reverse Turing test - we call it the Line CAPTCHAs - that
mainly focuses on user friendliness while not compromising the security aspect
that is expected to be provided by such a system.
|
[
{
"created": "Tue, 4 Feb 2014 09:39:32 GMT",
"version": "v1"
}
] |
2014-02-05
|
[
[
"Karunathilake",
"A. K. B.",
""
],
[
"Balasuriya",
"B. M. D.",
""
],
[
"Ragel",
"R. G.",
""
]
] |
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] |
1402.0673
|
Pierre Recho
|
P. Recho, J.-F. Joanny and L. Truskinovsky
|
Optimality of contraction-driven crawling
| null | null |
10.1103/PhysRevLett.112.218101
| null |
physics.bio-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study a model of cell motility where the condition of optimal trade-off
between performance and metabolic cost can be made precise. In this model a
steadily crawling fragment is represented by a layer of active gel placed on a
frictional surface and driven by contraction only. We find analytically the
distribution of contractile elements (pullers) ensuring that the efficiency of
self-propulsion is maximal. We then show that natural assumptions about
advection and diffusion of pullers produce a distribution that is remarkably
close to the optimal one and is qualitatively similar to the one observed in
experiments on fish keratocytes.
|
[
{
"created": "Tue, 4 Feb 2014 09:43:31 GMT",
"version": "v1"
},
{
"created": "Mon, 31 Mar 2014 09:45:59 GMT",
"version": "v2"
}
] |
2015-06-18
|
[
[
"Recho",
"P.",
""
],
[
"Joanny",
"J. -F.",
""
],
[
"Truskinovsky",
"L.",
""
]
] |
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] |
1402.0675
|
Viktor Veszpremi
|
Viktor Veszpremi (for the CMS Collaboration)
|
Operation and performance of the CMS tracker
|
accepted for publication in Journal of Instrumentation
| null |
10.1088/1748-0221/9/03/C03005
| null |
physics.ins-det hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The CMS silicon tracker consists of two tracking devices utilizing
semiconductor technology: the inner pixel and the outer strip detectors. They
operate in a high-occupancy and high-radiation environment presented by
particle collisions in the LHC. The tracker detectors occupy the region around
the center of CMS, where the LHC beams collide, between 4 cm and 110 cm in
radius and up to 280 cm along the beam axis. The pixel detector consists of 66
million pixels, covering about 1 m2 total area. It is surrounded by the strip
tracker with 10 million read-out channels covering about 200 m2 total area. The
proceedings describe the operational experience collected during the first
three years of LHC running. Results include operational challenges encountered
during data taking that influence the active fraction and read-out efficiency
of the detectors. Details are given about the performance of the tracker at
high occupancy with respect to local observables such as signal to noise ratio
and hit reconstruction efficiency. Studies of radiation effects are presented
with respect to the evolution of sensor bias, read-out thresholds in the inner
pixels, and leakage current.
|
[
{
"created": "Tue, 4 Feb 2014 10:00:42 GMT",
"version": "v1"
}
] |
2019-08-13
|
[
[
"Veszpremi",
"Viktor",
"",
"for the CMS Collaboration"
]
] |
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] |
1402.0679
|
Soeren Toxvaerd
|
Soeren Toxvaerd
|
Discrete dynamics versus analytic dynamics
|
12 pages, 2 figures
|
J. Chem. Phys. $\textbf{140}$, 044102 (2014)
|
10.1063/1.4862173
| null |
physics.chem-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
For discrete classical Molecular dynamics (MD) obtained by the "Verlet"
algorithm (VA) with the time increment $h$ there exists a shadow Hamiltonian
$\tilde{H}$ with energy $\tilde{E}(h)$, for which the discrete particle
positions lie on the analytic trajectories for $\tilde{H}$. Here we proof that
there, independent of such an analytic analogy, exists an exact hidden energy
invariance $E^*$ for VA dynamics.
The fact that the discrete VA dynamics has the same invariances as Newtonian
dynamics raises the question, which of the formulations that are correct, or
alternatively, the most appropriate formulation of classical dynamics. In this
context the relation between the discrete VA dynamics and the (general)
discrete dynamics investigated by T. D. Lee [Phys. Lett. $\textbf{122B}$, 217
(1983)] is presented and discussed.
|
[
{
"created": "Tue, 4 Feb 2014 10:18:11 GMT",
"version": "v1"
}
] |
2014-02-05
|
[
[
"Toxvaerd",
"Soeren",
""
]
] |
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] |
1402.0681
|
Evgenii Narimanov
|
Evgenii E. Narimanov
|
Photonic Hyper-Crystals
| null |
Phys. Rev. X 4, 041014 (2014)
|
10.1103/PhysRevX.4.041014
| null |
physics.optics
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We introduce a new "universality class" of artificial optical media -
photonic hyper-crystals. These hyperbolic metamaterials with periodic spatial
variation of dielectric permittivity on subwavelength scale, combine the
features of optical metamaterials and photonic crystals. In particular, surface
waves supported by a hyper-crystal, possess the properties of both the optical
Tamm states in photonic crystals and surface plasmon polaritons at the
metal-dielectric interface.
|
[
{
"created": "Tue, 4 Feb 2014 10:25:14 GMT",
"version": "v1"
}
] |
2014-11-05
|
[
[
"Narimanov",
"Evgenii E.",
""
]
] |
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] |
1402.0688
|
Jason Pillay
|
Jason Cornelius Pillay, Natsume Yuki, A. Douglas Stone and Y. D. Chong
|
Generalized Sub-Schawlow-Townes Laser Linewidths Via Material Dispersion
| null |
Phys. Rev. A 89, 033840 (2014)
|
10.1103/PhysRevA.89.033840
| null |
physics.optics
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A recent S matrix-based theory of the quantum-limited linewidth, which is
applicable to general lasers, including spatially non-uniform laser cavities
operating above threshold, is analyzed in various limits. For broadband gain, a
simple interpretation of the Petermann and bad-cavity factors is presented in
terms of geometric relations between the zeros and poles of the S matrix. When
there is substantial dispersion, on the frequency scale of the cavity lifetime,
the theory yields a generalization of the bad-cavity factor, which was
previously derived for spatially uniform one-dimensional lasers. This effect
can lead to sub-Schawlow-Townes linewidths in lasers with very narrow gain
widths. We derive a formula for the linewidth in terms of the lasing mode
functions, which has accuracy comparable to the previous formula involving the
residue of the lasing pole. These results for the quantum-limited linewidth are
valid even in the regime of strong line-pulling and spatial hole-burning, where
the linewidth cannot be factorized into independent Petermann and bad-cavity
factors.
|
[
{
"created": "Tue, 4 Feb 2014 10:56:01 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Mar 2014 02:45:51 GMT",
"version": "v2"
},
{
"created": "Mon, 17 Mar 2014 05:00:40 GMT",
"version": "v3"
}
] |
2014-04-02
|
[
[
"Pillay",
"Jason Cornelius",
""
],
[
"Yuki",
"Natsume",
""
],
[
"Stone",
"A. Douglas",
""
],
[
"Chong",
"Y. D.",
""
]
] |
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] |
1402.0693
|
Kinjal Shah
|
Kinjal N. Shah, Kirit R. Rathod, Shardul J. Agravat
|
A survey on Human Computer Interaction Mechanism Using Finger Tracking
|
4 pages, 8 figures, International Journal of Computer Trends and
Technology (IJCTT)
|
IJCTT 7(3):174-177, January 2014
|
10.14445/22312803/IJCTT-V7P148
| null |
cs.HC
|
http://creativecommons.org/licenses/by/3.0/
|
Human Computer Interaction (HCI) is a field in which developer makes a user
friendly system. User can interact with a computer system without using any
conventional peripheral devices. Marker is used to recognize hand movement
accurately & successfully. Researchers establish the mechanism to interact with
computer system using computer vision. The interaction is better than normal
static keyboard and mouse. This paper represents most of innovative mechanisms
of the finger tracking used to interact with a computer system using computer
vision.
|
[
{
"created": "Tue, 4 Feb 2014 11:13:56 GMT",
"version": "v1"
}
] |
2014-02-05
|
[
[
"Shah",
"Kinjal N.",
""
],
[
"Rathod",
"Kirit R.",
""
],
[
"Agravat",
"Shardul J.",
""
]
] |
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] |
1402.0696
|
Shafi'i Muhammad Abdulhamid Mr
|
Shafii Muhammad Abdulhamid, Muhammad Shafie Abd Latiff, Mohammed Bakri
Bashir
|
On-Demand Grid Provisioning Using Cloud Infrastructures and Related
Virtualization Tools: A Survey and Taxonomy
|
11 page, 6 figures, 1 table
|
International Journal of Advanced Studies in Computer Science and
Engineering IJASCSE, Volume 3, Issue 1, 2014
| null | null |
cs.DC
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Recent researches have shown that grid resources can be accessed by client
on-demand, with the help of virtualization technology in the Cloud. The virtual
machines hosted by the hypervisors are being utilized to build the grid network
within the cloud environment. The aim of this study is to survey some concepts
used for the on-demand grid provisioning using Infrastructure as a Service
Cloud and the taxonomy of its related components. This paper, discusses the
different approaches for on-demand grid using infrastructural Cloud, the issues
it tries to address and the implementation tools. The paper also, proposed an
extended classification for the virtualization technology used and a new
classification for the Grid-Cloud integration which was based on the
architecture, communication flow and the user demand for the Grid resources.
This survey, tools and taxonomies presented here will contribute as a guide in
the design of future architectures for further researches.
|
[
{
"created": "Tue, 4 Feb 2014 11:27:56 GMT",
"version": "v1"
}
] |
2014-02-05
|
[
[
"Abdulhamid",
"Shafii Muhammad",
""
],
[
"Latiff",
"Muhammad Shafie Abd",
""
],
[
"Bashir",
"Mohammed Bakri",
""
]
] |
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] |
1402.0698
|
Debi Prosad Dogra
|
D. P. Dogra, K. Nandam, A. K. Majumdar, S. Suralt, J. Mukhopadhyay, B.
Majumdar and A. Singh, S. Mukherjee
|
User Friendly Implementation for Efficiently Conducting Hammersmith
Infant Neurological Examination
| null |
IEEE Proceedings of the 12th International Conference on E-Health
Networking, Application and Services (Healthcom), Lyon, France, pp.374-378,
2010
|
10.1109/HEALTH.2010.5556541
| null |
cs.CY
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The aim of this work is to design a semi-automatic application that can be
used as an aid by the doctors for smoothly conducting Hammersmith Infant
Neurological Examination (IDNE). A simplified version of the examination which
provides a quantitative neurological assessment is used to design the
application. The application includes a methodology of conducting IDNE
examination suited to inexperienced staff, applicable to both neonatal and
post-neonatal infants. It also provides a facility to go through the previous
records of a patient that can help in diagnosing patients with high risk of
neurological disorder. A semi-automatic approach is proposed for skeleton
generation. The application has been installed in hospitals and currently in
operation. It is expected to increase the efficiency of conducting HINE using
the proposed application.
|
[
{
"created": "Tue, 4 Feb 2014 11:36:43 GMT",
"version": "v1"
}
] |
2016-11-18
|
[
[
"Dogra",
"D. P.",
""
],
[
"Nandam",
"K.",
""
],
[
"Majumdar",
"A. K.",
""
],
[
"Suralt",
"S.",
""
],
[
"Mukhopadhyay",
"J.",
""
],
[
"Majumdar",
"B.",
""
],
[
"Singh",
"A.",
""
],
[
"Mukherjee",
"S.",
""
]
] |
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] |
1402.0701
|
Tobias Lau
|
A. Langenberg, K. Hirsch, A. Lawicki, V. Zamudio-Bayer, M. Niemeyer,
P. Chmiela, B. Langbehn, A. Terasaki, B. v. Issendorff, and J. T. Lau
|
Spin and orbital magnetic moments of size-selected iron, cobalt, and
nickel clusters and their link to the bulk phase diagrams
| null |
Phys. Rev. B 90, 184420 (2014)
|
10.1103/PhysRevB.90.184420
| null |
physics.atm-clus cond-mat.mtrl-sci
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Spin and orbital magnetic moments of cationic iron, cobalt, and nickel
clusters have been determined from x-ray magnetic circular dichroism
spectroscopy. In the size regime of $n = 10 - 15$ atoms, these clusters show
strong ferromagnetism with maximized spin magnetic moments of 1~$\mu_B$ per
empty $3d$ state because of completely filled $3d$ majority spin bands. The
only exception is $\mathrm{Fe}_{13}^+$ where an unusually low average spin
magnetic moment of $0.73 \pm 0.12$~$\mu_B$ per unoccupied $3d$ state is
detected; an effect, which is neither observed for $\mathrm{Co}_{13}^+$ nor
$\mathrm{Ni}_{13}^+$.\@ This distinct behavior can be linked to the existence
and accessibility of antiferromagnetic, paramagnetic, or nonmagnetic phases in
the respective bulk phase diagrams of iron, cobalt, and nickel. Compared to the
experimental data, available density functional theory calculations generally
seem to underestimate the spin magnetic moments significantly. In all clusters
investigated, the orbital magnetic moment is quenched to $5 - 25$\,\% of the
atomic value by the reduced symmetry of the crystal field. The magnetic
anisotropy energy is well below 65 $\mu$eV per atom.
|
[
{
"created": "Tue, 4 Feb 2014 11:52:53 GMT",
"version": "v1"
}
] |
2014-12-01
|
[
[
"Langenberg",
"A.",
""
],
[
"Hirsch",
"K.",
""
],
[
"Lawicki",
"A.",
""
],
[
"Zamudio-Bayer",
"V.",
""
],
[
"Niemeyer",
"M.",
""
],
[
"Chmiela",
"P.",
""
],
[
"Langbehn",
"B.",
""
],
[
"Terasaki",
"A.",
""
],
[
"Issendorff",
"B. v.",
""
],
[
"Lau",
"J. T.",
""
]
] |
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] |
1402.0702
|
Piotr S. \.Zuchowski
|
Piotr S. \.Zuchowski, Romain Guerout, Olivier Dulieu
|
Ground and excited state properties of the polar and paramagnetic RbSr
molecule: a comparative study
|
12 pages, 8 figures
|
Phys. Rev. A 90, 012507 (2014)
|
10.1103/PhysRevA.90.012507
| null |
physics.chem-ph physics.atm-clus
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
This paper deals with the electronic structure of RbSr, a molecule possessing
both a permanent magnetic and electric dipole moment in its own frame allowing
its manipulation with external fields. Two complementary ab-initio approaches
are used for the ground and lowest excited states: first, an approach relying
on optimized effective core potentials with core polarization potentials based
on a full configuration interaction involving three valence electrons, and
second, an approach using a small-size effective core potential with 19
correlated electrons in the framework of coupled-cluster theory. We have found
excellent agreement between these two approaches for the ground state
properties including the permanent dipole moment. We have focused on studies of
excited states correlated to the two lowest asymptotes Rb(5p)+Sr(5s) and
Rb(5s)+Sr(5s5p) relevant for ongoing experiments on quantum degenerate gases.
We present also the Hund c) case potential curves obtained using atomic
spin-orbit constants. These potential curves are an excellent starting point
for experimental studies of molecular structure of RbSr using high-resolution
spectroscopy.
|
[
{
"created": "Tue, 4 Feb 2014 11:58:42 GMT",
"version": "v1"
}
] |
2014-07-16
|
[
[
"Żuchowski",
"Piotr S.",
""
],
[
"Guerout",
"Romain",
""
],
[
"Dulieu",
"Olivier",
""
]
] |
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] |
1402.0705
|
Sylvain Schmitz
|
Sylvain Schmitz
|
Implicational Relevance Logic is 2-EXPTIME-Complete
|
Fixed Fig. 6 as pointed out by Hiromi Tanaka
|
Proceedings of RTA-TLCA 2014, Lecture Notes in Computer Science
8560, pp. 395--409, Springer, 2014; journal version in Journal of Symbolic
Logic 81(2), pages 641--661, 2016
|
10.1007/978-3-319-08918-8_27 10.1017/jsl.2015.7
| null |
cs.LO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We show that provability in the implicational fragment of relevance logic is
complete for doubly exponential time, using reductions to and from coverability
in branching vector addition systems.
|
[
{
"created": "Tue, 4 Feb 2014 12:06:05 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Sep 2014 15:44:08 GMT",
"version": "v2"
},
{
"created": "Fri, 19 Jun 2015 15:29:24 GMT",
"version": "v3"
},
{
"created": "Mon, 16 May 2022 20:45:48 GMT",
"version": "v4"
}
] |
2022-05-18
|
[
[
"Schmitz",
"Sylvain",
""
]
] |
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] |
1402.0708
|
Sadik Ulker
|
Ezgi Deniz Ulker and Sadik Ulker
|
Microstrip Coupler Design Using Bat Algorithm
|
7 pages, 4 figures, 1 table
|
International Journal of Artificial Intelligence & Applications
(IJAIA), vol. 5, no. 1, January 2014, pp. 127-133
|
10.5121/ijaia.2014.5110
| null |
cs.NE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Evolutionary and swarm algorithms have found many applications in design
problems since todays computing power enables these algorithms to find
solutions to complicated design problems very fast. Newly proposed hybrid
algorithm, bat algorithm, has been applied for the design of microwave
microstrip couplers for the first time. Simulation results indicate that the
bat algorithm is a very fast algorithm and it produces very reliable results.
|
[
{
"created": "Tue, 4 Feb 2014 12:25:31 GMT",
"version": "v1"
}
] |
2014-02-05
|
[
[
"Ulker",
"Ezgi Deniz",
""
],
[
"Ulker",
"Sadik",
""
]
] |
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] |
1402.0710
|
Andrea Soltoggio
|
Andrea Soltoggio
|
Short-term plasticity as cause-effect hypothesis testing in distal
reward learning
|
Biological Cybernetics, September 2014
| null |
10.1007/s00422-014-0628-0
| null |
cs.NE q-bio.NC
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Asynchrony, overlaps and delays in sensory-motor signals introduce ambiguity
as to which stimuli, actions, and rewards are causally related. Only the
repetition of reward episodes helps distinguish true cause-effect relationships
from coincidental occurrences. In the model proposed here, a novel plasticity
rule employs short and long-term changes to evaluate hypotheses on cause-effect
relationships. Transient weights represent hypotheses that are consolidated in
long-term memory only when they consistently predict or cause future rewards.
The main objective of the model is to preserve existing network topologies when
learning with ambiguous information flows. Learning is also improved by biasing
the exploration of the stimulus-response space towards actions that in the past
occurred before rewards. The model indicates under which conditions beliefs can
be consolidated in long-term memory, it suggests a solution to the
plasticity-stability dilemma, and proposes an interpretation of the role of
short-term plasticity.
|
[
{
"created": "Tue, 4 Feb 2014 12:37:20 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Jun 2014 14:22:29 GMT",
"version": "v2"
},
{
"created": "Fri, 11 Jul 2014 13:06:49 GMT",
"version": "v3"
},
{
"created": "Mon, 11 Aug 2014 13:37:45 GMT",
"version": "v4"
},
{
"created": "Tue, 9 Sep 2014 15:42:23 GMT",
"version": "v5"
}
] |
2014-09-10
|
[
[
"Soltoggio",
"Andrea",
""
]
] |
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Short-term plasticity as cause-effect hypothesis testing in distal reward learning
|
http://arxiv.org/abs/1402.0710v5
|
http://arxiv.org/pdf/1402.0710v5.pdf
|
https://github.com/soltoggio/Short-term-plasticity-as-hypothesis-testing-in-distal-reward-learning
| true | false |
https://paperswithcode.com/paper/short-term-plasticity-as-cause-effect
|
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] |
1402.0714
|
Utku Kemiktarak
|
Utku Kemiktarak, Mathieu Durand, Michael Metcalfe, and John Lawall
|
Mode competition and anomalous cooling in a multimode phonon laser
| null | null |
10.1103/PhysRevLett.113.030802
| null |
physics.optics cond-mat.other
|
http://creativecommons.org/licenses/publicdomain/
|
We study mode competition in a multimode "phonon laser" comprised of an
optical cavity employing a highly reflective membrane as the output coupler.
Mechanical gain is provided by the intracavity radiation pressure, to which
many mechanical modes are coupled. We calculate the gain, and find that strong
oscillation in one mode suppresses the gain in other modes. For sufficiently
strong oscillation, the gain of the other modes actually switches sign and
becomes damping, a process we call "anomalous cooling." We demonstrate that
mode competition leads to single-mode operation and find excellent agreement
with our theory, including anomalous cooling.
|
[
{
"created": "Tue, 4 Feb 2014 12:46:40 GMT",
"version": "v1"
}
] |
2015-06-18
|
[
[
"Kemiktarak",
"Utku",
""
],
[
"Durand",
"Mathieu",
""
],
[
"Metcalfe",
"Michael",
""
],
[
"Lawall",
"John",
""
]
] |
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] |
1402.0715
|
Sumesh Thampi
|
Sumesh P. Thampi, Ramin Golestanian, and Julia M. Yeomans
|
Vorticity, Defects and Correlations in Active Turbulence
| null | null |
10.1098/rsta.2013.0366
| null |
cond-mat.soft cond-mat.stat-mech physics.flu-dyn
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We describe a numerical investigation of a continuum model of an active
nematic, concentrating on the regime of active turbulence. Results are
presented for the effect of three parameters, activity, elastic constant and
rotational diffusion constant, on the order parameter and flow fields. Defects
and distortions in the director field act as sources of vorticity, and thus
vorticity is strongly correlated to the director field. In particular the
characteristic length of decay of vorticity and order parameter correlations is
controlled by the defect density. By contrast the decay of velocity
correlations is determined by a balance between activity and dissipation. We
highlight the role of microscopic flow generation mechanisms in determining the
flow patterns and characteristic scales of active turbulence and contrast the
behaviour of extensile and contractile active nematics.
|
[
{
"created": "Tue, 4 Feb 2014 12:55:26 GMT",
"version": "v1"
}
] |
2015-06-18
|
[
[
"Thampi",
"Sumesh P.",
""
],
[
"Golestanian",
"Ramin",
""
],
[
"Yeomans",
"Julia M.",
""
]
] |
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] |
1402.0719
|
Makoto Hirota
|
Makoto Hirota, Philip J. Morrison and Yuji Hattori
|
Variational Necessary and Sufficient Stability Conditions for Inviscid
Shear Flow
|
18pages, 4 figures, submitted to Proc. R. Soc. Lond. A
| null |
10.1098/rspa.2014.0322
| null |
physics.flu-dyn math-ph math.MP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
A necessary and sufficient condition for linear stability of inviscid
parallel shear flow is formulated by developing a novel variational principle,
where the velocity profile is assumed to be monotonic and analytic. It is shown
that unstable eigenvalues of Rayleigh's equation (which is a non-selfadjoint
eigenvalue problem) can be associated with positive eigenvalues of a certain
selfadjoint operator. The stability is therefore determined by maximizing a
quadratic form, which is theoretically and numerically more tractable than
directly solving Rayleigh's equation. This variational stability criterion is
based on the understandings of Krein signature for continuous spectrum and is
applicable to other stability problems of infinite-dimensional Hamiltonian
systems.
|
[
{
"created": "Tue, 4 Feb 2014 13:05:35 GMT",
"version": "v1"
}
] |
2015-06-18
|
[
[
"Hirota",
"Makoto",
""
],
[
"Morrison",
"Philip J.",
""
],
[
"Hattori",
"Yuji",
""
]
] |
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] |
1402.0728
|
Dominik Kowald
|
Dominik Kowald, Paul Seitlinger, Christoph Trattner, Tobias Ley
|
Forgetting the Words but Remembering the Meaning: Modeling Forgetting in
a Verbal and Semantic Tag Recommender
| null | null | null | null |
cs.IR
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We assume that recommender systems are more successful, when they are based
on a thorough understanding of how people process information. In the current
paper we test this assumption in the context of social tagging systems.
Cognitive research on how people assign tags has shown that they draw on two
interconnected levels of knowledge in their memory: on a conceptual level of
semantic fields or topics, and on a lexical level that turns patterns on the
semantic level into words. Another strand of tagging research reveals a strong
impact of time dependent forgetting on users' tag choices, such that recently
used tags have a higher probability being reused than "older" tags. In this
paper, we align both strands by implementing a computational theory of human
memory that integrates the two-level conception and the process of forgetting
in form of a tag recommender and test it in three large-scale social tagging
datasets (drawn from BibSonomy, CiteULike and Flickr).
As expected, our results reveal a selective effect of time: forgetting is
much more pronounced on the lexical level of tags. Second, an extensive
evaluation based on this observation shows that a tag recommender
interconnecting both levels and integrating time dependent forgetting on the
lexical level results in high accuracy predictions and outperforms other
well-established algorithms, such as Collaborative Filtering, Pairwise
Interaction Tensor Factorization, FolkRank and two alternative time dependent
approaches. We conclude that tag recommenders can benefit from going beyond the
manifest level of word co-occurrences, and from including forgetting processes
on the lexical level.
|
[
{
"created": "Tue, 4 Feb 2014 13:31:10 GMT",
"version": "v1"
},
{
"created": "Thu, 8 May 2014 08:37:04 GMT",
"version": "v2"
}
] |
2014-05-09
|
[
[
"Kowald",
"Dominik",
""
],
[
"Seitlinger",
"Paul",
""
],
[
"Trattner",
"Christoph",
""
],
[
"Ley",
"Tobias",
""
]
] |
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] |
1402.0729
|
Nikolaos Pappas
|
Nikolaos Pappas, Anthony Ephremides, Apostolos Traganitis
|
Stability and Performance Issues of a Relay Assisted Multiple Access
Scheme with MPR Capabilities
|
Accepted for publication in Elsevier Computer Communications. arXiv
admin note: substantial text overlap with arXiv:1105.0452
| null |
10.1016/j.comcom.2014.01.004
| null |
cs.IT cs.NI math.IT
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this work, we study the impact of a relay node to a network with a finite
number of users-sources and a destination node. We assume that the users have
saturated queues and the relay node does not have packets of its own; we have
random access of the medium and the time is slotted. The relay node stores a
source packet that it receives successfully in its queue when the transmission
to the destination node has failed. The relay and the destination nodes have
multi-packet reception capabilities. We obtain analytical equations for the
characteristics of the relay's queue such as average queue length, stability
conditions etc. We also study the throughput per user and the aggregate
throughput for the network.
|
[
{
"created": "Tue, 4 Feb 2014 13:31:44 GMT",
"version": "v1"
}
] |
2014-02-05
|
[
[
"Pappas",
"Nikolaos",
""
],
[
"Ephremides",
"Anthony",
""
],
[
"Traganitis",
"Apostolos",
""
]
] |
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] |
1402.0730
|
Luiza Buimaga-Iarinca
|
Luiza Buimaga-Iarinca and Cristian Morari
|
Adsorption of small aromatic molecules on gold: a DFT localized basis
set study including van der Waals effects
| null | null | null | null |
physics.chem-ph cond-mat.mtrl-sci
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We compare the density functional theory (DFT) results on the adsorption of
small aromatic molecules (benzene, pyridine and thiophene) on gold surfaces
obtained by using three types of van der Waals exchange-correlation functionals
and localized basis set calculations. We show that the value of the molecule
surface binding energy depends on the interplay between the BSSE effect and the
tendency of the exchange-correlation functionals to overestimate both the
molecule-surface as well as the gold-gold distances within the relaxed systems.
Consequently, we find that by using different types of LCAO basis sets or
geometric models for the adsorption of the molecules on the surface, the
binding energy can vary up to 100 %. A critical analysis of the physical
parameters resulting from the calculations is presented for each
exchange-correlation functional.
|
[
{
"created": "Tue, 4 Feb 2014 13:33:57 GMT",
"version": "v1"
}
] |
2014-02-05
|
[
[
"Buimaga-Iarinca",
"Luiza",
""
],
[
"Morari",
"Cristian",
""
]
] |
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] |
1402.0735
|
Alexei Dmitriev V.
|
A.V. Dmitriev and J.-K. Chao
|
Dependence of geosynchronous relativistic electron enhancements on
geomagnetic parameters
|
Relativistic electrons, magnetospheric acceleration, geomagnetic
indices, magnetopause
|
J. Geophys. Res., 108(A11), 1388
|
10.1029/2002JA009664
| null |
physics.space-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Relativistic electron fluxes observed in geosynchronous orbit by GOES-8 in
1997 to 2000 were considered as a complex function of geomagnetic indices PC,
Kp, and Dst as well as parameters of the magnetosphere size, subsolar Rs and
terminator Rf magnetopause distances. A geosynchronous relativistic electron
enhancement (GREE) is determined as daily maximal electron flux exceeding the
upper root mean square deviation (RMSD) threshold of about 1500 (cm2s sr)-1.
Comparison analysis of the GREE dynamics and geomagnetic conditions on the
rising phase of current solar cycle revealed suppression of the relativistic
electron enhancements by substantially increased strong geomagnetic activity in
the solar maximum. Statistical consideration of a relationship between the
GREEs and the geomagnetic parameters showed that the most important parameters
controlling the geosynchronous relativistic electron enhancements were 4-day
averaged Kp index, PC index and magnetopause termination distance Rf delayed
respectively on 3 and 14 hours. Relatively high averaging time for Kp was
explained by cumulative effect of substorm energy release in a gradual
mechanism accelerating the relativistic electrons in the magnetosphere. Very
short time delay for PC index was interpreted as intensification of a fast
acceleration mechanism producing the GREEs during severe geomagnetic storms.
Substantial increase of the PC index (PC>5) was founded as a sufficient
condition for GREE occurrence. The fast response of the geosynchronous
relativistic electron fluxes on the magnetosphere compression was explained by
drift losses of the energetic electrons at the magnetopause which approaches
the Earth during geomagnetic storms.
|
[
{
"created": "Tue, 4 Feb 2014 13:56:50 GMT",
"version": "v1"
}
] |
2014-02-05
|
[
[
"Dmitriev",
"A. V.",
""
],
[
"Chao",
"J. -K.",
""
]
] |
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] |
1402.0736
|
V Karthikeyan VKK
|
V.Karthikeyan, Geethanjali.S, Mekala.M, Deepika.T
|
Water Eminence Scrutinizing Scheme Based On Zigbee and Wireless Antenna
Expertise - A Study
|
8 FIGURES AND 5 PAGES
| null | null | null |
cs.NI
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Wireless Sensor Network is the essential structure of a water eminence
monitoring by means of wireless sensor network technology To scrutinize water
quality greater than different sites as a synchronized application an estimable
system structural design constituted by spread sensor nodes and a base station
is suggested The nodes and base stations are linked using WSN technology like
Zigbee Base stations are related via Ethernet. Design and execution of a
prototype using WSN technology are the exigent work. Data are identified by
means of dissimilar sensors at the node plane to compute the parameters like
turbidity and oxygen quantity is transmitted via WSN to the support station
Information unruffled from the distant location is capable of displayed in
diagram setup as well as it is able to be calculated using dissimilar
replication tools at the supporting station. The recent methods have benefits
such as null amount carbon emission low power utilization more stretchy to put
together at distant locations.
|
[
{
"created": "Tue, 4 Feb 2014 13:58:38 GMT",
"version": "v1"
}
] |
2014-02-05
|
[
[
"Karthikeyan",
"V.",
""
],
[
"S",
"Geethanjali.",
""
],
[
"M",
"Mekala.",
""
],
[
"T",
"Deepika.",
""
]
] |
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] |
1402.0746
|
Harald Zankl
|
Harald Zankl (University of Innsbruck), Martin Korp (University of
Innsbruck)
|
Modular Complexity Analysis for Term Rewriting
|
33 pages; Special issue of RTA 2010
|
Logical Methods in Computer Science, Volume 10, Issue 1 (April 1,
2014) lmcs:749
|
10.2168/LMCS-10(1:19)2014
| null |
cs.LO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
All current investigations to analyze the derivational complexity of term
rewrite systems are based on a single termination method, possibly preceded by
transformations. However, the exclusive use of direct criteria is problematic
due to their restricted power. To overcome this limitation the article
introduces a modular framework which allows to infer (polynomial) upper bounds
on the complexity of term rewrite systems by combining different criteria.
Since the fundamental idea is based on relative rewriting, we study how matrix
interpretations and match-bounds can be used and extended to measure complexity
for relative rewriting, respectively. The modular framework is proved strictly
more powerful than the conventional setting. Furthermore, the results have been
implemented and experiments show significant gains in power.
|
[
{
"created": "Tue, 4 Feb 2014 14:38:21 GMT",
"version": "v1"
},
{
"created": "Sat, 29 Mar 2014 16:55:46 GMT",
"version": "v2"
}
] |
2015-07-01
|
[
[
"Zankl",
"Harald",
"",
"University of Innsbruck"
],
[
"Korp",
"Martin",
"",
"University of\n Innsbruck"
]
] |
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] |
1402.0749
|
Katy Rubin
|
Katy J. Rubin, Katherine Lawler, Peter Sollich, Tony Ng
|
Memory effects in biochemical networks as the natural counterpart of
extrinsic noise
| null | null | null | null |
q-bio.QM physics.bio-ph q-bio.MN
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We show that in the generic situation where a biological network, e.g. a
protein interaction network, is in fact a subnetwork embedded in a larger
"bulk" network, the presence of the bulk causes not just extrinsic noise but
also memory effects. This means that the dynamics of the subnetwork will depend
not only on its present state, but also its past. We use projection techniques
to get explicit expressions for the memory functions that encode such memory
effects, for generic protein interaction networks involving binary and unary
reactions such as complex formation and phosphorylation, respectively.
Remarkably, in the limit of low intrinsic copy-number noise such expressions
can be obtained even for nonlinear dependences on the past. We illustrate the
method with examples from a protein interaction network around epidermal growth
factor receptor (EGFR), which is relevant to cancer signalling. These examples
demonstrate that inclusion of memory terms is not only important conceptually
but also leads to substantially higher quantitative accuracy in the predicted
subnetwork dynamics.
|
[
{
"created": "Tue, 4 Feb 2014 14:42:51 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Jun 2014 12:44:40 GMT",
"version": "v2"
}
] |
2014-06-17
|
[
[
"Rubin",
"Katy J.",
""
],
[
"Lawler",
"Katherine",
""
],
[
"Sollich",
"Peter",
""
],
[
"Ng",
"Tony",
""
]
] |
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] |
1402.0750
|
Fatima Ebrahimi
|
F. Ebrahimi and A. Bhattacharjee
|
Helicity-Flux-Driven Alpha Effect in Laboratory and Astrophysical
Plasmas
|
Accepted for publication PRL on Feb. 20 2014 - 4 pages (4 figures)
| null |
10.1103/PhysRevLett.112.125003
| null |
astro-ph.HE physics.plasm-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The constraint imposed by magnetic helicity conservation on the alpha effect
is considered for both magnetically and flow dominated self-organizing plasmas.
Direct numerical simulations are presented for a dominant contribution to the
alpha effect, which can be cast in the functional form of a total divergence of
an averaged helicity flux, called the helicity-flux-driven alpha ( H$\alpha$)
effect. Direct numerical simulations of the H$\alpha$ effect are prese nted for
two examples---the magnetically dominated toroidal plasma unstable to tearing
modes, and the flow-dominated accretion disk.
|
[
{
"created": "Tue, 4 Feb 2014 14:47:34 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Mar 2014 18:36:44 GMT",
"version": "v2"
}
] |
2015-06-18
|
[
[
"Ebrahimi",
"F.",
""
],
[
"Bhattacharjee",
"A.",
""
]
] |
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] |
1402.0761
|
Kristina Sojakova
|
Kristina Sojakova
|
Higher Inductive Types as Homotopy-Initial Algebras
| null | null | null | null |
cs.LO math.CT math.LO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Homotopy Type Theory is a new field of mathematics based on the surprising
and elegant correspondence between Martin-Lofs constructive type theory and
abstract homotopy theory. We have a powerful interplay between these
disciplines - we can use geometric intuition to formulate new concepts in type
theory and, conversely, use type-theoretic machinery to verify and often
simplify existing mathematical proofs. A crucial ingredient in this new system
are higher inductive types, which allow us to represent objects such as
spheres, tori, pushouts, and quotients. We investigate a variant of higher
inductive types whose computational behavior is determined up to a higher path.
We show that in this setting, higher inductive types are characterized by the
universal property of being a homotopy-initial algebra.
|
[
{
"created": "Tue, 4 Feb 2014 15:22:49 GMT",
"version": "v1"
}
] |
2014-02-10
|
[
[
"Sojakova",
"Kristina",
""
]
] |
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] |
1402.0769
|
Reza Dadfar
|
R. Dadfar, N. Fabbiane, S. Bagheri and D.S. Henningson
|
Centralised versus Decentralised Active Control of Boundary Layer
Instabilities
|
17 pages
| null | null | null |
physics.flu-dyn
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We use linear control theory to construct an output feedback controller for
the attenuation of small-amplitude Tollmien-Schlichting (TS) wavepackets in a
flat-plate boundary layer.We distribute evenly in the spanwise direction up to
72 localized objects near the wall (18 disturbances sources, 18 actuators, 18
estimation sensors and 18 objective sensors). In a fully three-dimensional
configuration,the interconnection between inputs and outputs becomes quickly
unfeasible when the number of actuators and sensors increases in the spanswise
direction. The objective of this work is to understand how an efficient
controller may be designed by connecting only a subset of the actuators to
sensors, thereby reducing the complexity of the controller, without comprising
the efficiency. We find that using a semi-decentralized approach - where small
control units consisting of 3 estimation sensors connected to 3 actuators are
replicated 6 times along the spanwise direction - results only in a 11%
reduction of control performance. Our results reveal that the best performance
is obtained for a control unit which (i) is sufficiently wide to account for
the full spanwise scale of the wavepacket when it reaches the actuators and
(ii) is designed to account for the perturbations which are coming from the
lateral sides (crosstalk) of the estimation sensors. We have also found that
the influence of crosstalk is not as essential as the spreading effect.
|
[
{
"created": "Tue, 4 Feb 2014 15:37:44 GMT",
"version": "v1"
}
] |
2014-02-05
|
[
[
"Dadfar",
"R.",
""
],
[
"Fabbiane",
"N.",
""
],
[
"Bagheri",
"S.",
""
],
[
"Henningson",
"D. S.",
""
]
] |
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] |
1402.0776
|
Vladimir Yurovsky
|
Vladimir A. Yurovsky
|
Permutation symmetry in spinor quantum gases: selection rules,
conservation laws, and correlations
|
A citation added
|
Phys. Rev. Lett. 113, 200406 (2014)
|
10.1103/PhysRevLett.113.200406
|
NSF-KITP-14-012
|
cond-mat.quant-gas math-ph math.MP physics.atom-ph quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Many-body systems of identical arbitrary-spin particles, with separable spin
and spatial degrees of freedom, are considered. Their eigenstates can be
classified by Young diagrams, corresponding to non-trivial permutation
symmetries (beyond the conventional paradigm of symmetric--antisymmetric
states).
The present work obtains (a) selection rules for additional non-separable
(dependent on spins and coordinates) $k$-body interactions: the Young diagrams,
associated with the initial and the final states of a transition, can differ by
relocation of no more than $k$ boxes between their rows; and (b) correlation
rules: eigenstate-averaged local correlations of $k$ particles vanish if $k$
exceeds the number of columns (for bosons) or rows (for fermions) in the
associated Young diagram. It also elucidates the physical meaning of the
quantities conserved due to permutation symmetry --- in 1929, Dirac identified
those with characters of the symmetric group --- relating them to
experimentally observable correlations of several particles.
The results provide a way to control the formation of entangled states
belonging to multidimensional non-Abelian representations of the symmetric
group. These states can find applications in quantum computation and metrology.
|
[
{
"created": "Tue, 4 Feb 2014 15:50:47 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Mar 2014 09:50:44 GMT",
"version": "v2"
},
{
"created": "Sat, 25 Oct 2014 20:35:39 GMT",
"version": "v3"
},
{
"created": "Thu, 13 Nov 2014 12:52:06 GMT",
"version": "v4"
}
] |
2014-11-17
|
[
[
"Yurovsky",
"Vladimir A.",
""
]
] |
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] |
1402.0779
|
Nathanael Perraudin N. P.
|
Nathanael Perraudin, Vassilis Kalofolias, David Shuman, Pierre
Vandergheynst
|
UNLocBoX: A MATLAB convex optimization toolbox for proximal-splitting
methods
|
Draft
| null | null | null |
cs.LG stat.ML
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Convex optimization is an essential tool for machine learning, as many of its
problems can be formulated as minimization problems of specific objective
functions. While there is a large variety of algorithms available to solve
convex problems, we can argue that it becomes more and more important to focus
on efficient, scalable methods that can deal with big data. When the objective
function can be written as a sum of "simple" terms, proximal splitting methods
are a good choice. UNLocBoX is a MATLAB library that implements many of these
methods, designed to solve convex optimization problems of the form $\min_{x
\in \mathbb{R}^N} \sum_{n=1}^K f_n(x).$ It contains the most recent solvers
such as FISTA, Douglas-Rachford, SDMM as well a primal dual techniques such as
Chambolle-Pock and forward-backward-forward. It also includes an extensive list
of common proximal operators that can be combined, allowing for a quick
implementation of a large variety of convex problems.
|
[
{
"created": "Tue, 4 Feb 2014 15:58:44 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Mar 2014 11:09:57 GMT",
"version": "v2"
},
{
"created": "Tue, 27 Dec 2016 07:38:32 GMT",
"version": "v3"
}
] |
2016-12-28
|
[
[
"Perraudin",
"Nathanael",
""
],
[
"Kalofolias",
"Vassilis",
""
],
[
"Shuman",
"David",
""
],
[
"Vandergheynst",
"Pierre",
""
]
] |
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] |
1402.0780
|
Setare Yaghubi
|
Setare Yaghubi, Nasser modiri, Masoud Rafighi
|
Model performance indicators ERP systems
| null | null | null | null |
cs.SE
|
http://creativecommons.org/licenses/by-nc-sa/3.0/
|
Implementation process ERP is complex and expensive process. Typically always
be faced with many failures. Successfully implemented in an organization has
many challenges. Organizations in the deployment and success of the system
depends on several factors.One of the key factors in the successful deployment
of systems methodology is the implementation process. Methodology has several
indicators for successful implementation of ERP systems, we have examined. And
indicators for each of the methodologies have identified. The proposed method
is also an important indicator of the success of security controls and
indicators to be monitored and controlled.
|
[
{
"created": "Tue, 4 Feb 2014 15:59:48 GMT",
"version": "v1"
}
] |
2014-02-05
|
[
[
"Yaghubi",
"Setare",
""
],
[
"modiri",
"Nasser",
""
],
[
"Rafighi",
"Masoud",
""
]
] |
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] |
1402.0782
|
Tsogbayar Tsednee
|
Ts Tsogbayar and M Horbatsch
|
Floquet calculation of harmonic generation from hydrogen molecular ions
in strong monochromatic laser fields
|
15 pages, 23 figures
| null |
10.1088/0953-4075/47/11/115003
| null |
physics.atom-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present Floquet calculations of high harmonic generation (HHG) for the
lowest two electronic states of the $\mbox{H}_2^+$ ion by strong
continuous-wave laser fields. We solve the non-Hermitian matrix problem to get
accurate solutions to the periodic time-dependent Schr\"odinger equation (TDSE)
by applying a pseudospectral representation combined with a complex absorbing
potential method. This represents an alternative approach to direct TDSE
solutions to obtain the harmonic spectra for the ion. We compare our HHG rates
for the lower and upper states of $\mbox{H}^{+}_{2}$, which correspond to the
gerade and ungerade ground states in the field-free case, with previously
obtained results in the literature. We show that the enhancement of the
ionization rates at the critical internuclear separation $R_{c}\approx 8\,au$
plays some role in the appearance of very strong harmonic orders $n=5-11$ at
$\lambda = 1064\,nm$ and $n=5-9$ at $\lambda = 800\,nm$ and intensity
$I=10^{14}\,W/cm^{2}$.
|
[
{
"created": "Tue, 4 Feb 2014 16:03:00 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Feb 2014 16:09:46 GMT",
"version": "v2"
}
] |
2015-06-18
|
[
[
"Tsogbayar",
"Ts",
""
],
[
"Horbatsch",
"M",
""
]
] |
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] |
1402.0785
|
Hong Jiang
|
Hong Jiang, Gang Huang and Paul Wilford
|
Signal to Noise Ratio in Lensless Compressive Imaging
|
5 pages, 4 figures
| null | null | null |
cs.CV
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We analyze the signal to noise ratio (SNR) in a lensless compressive imaging
(LCI) architecture. The architecture consists of a sensor of a single detecting
element and an aperture assembly of an array of programmable elements. LCI can
be used in conjunction with compressive sensing to capture images in a
compressed form of compressive measurements. In this paper, we perform SNR
analysis of the LCI and compare it with imaging with a pinhole or a lens. We
will show that the SNR in the LCI is independent of the image resolution, while
the SNR in either pinhole aperture imaging or lens aperture imaging decreases
as the image resolution increases. Consequently, the SNR in the LCI is much
higher if the image resolution is large enough.
|
[
{
"created": "Tue, 4 Feb 2014 16:12:53 GMT",
"version": "v1"
}
] |
2014-02-05
|
[
[
"Jiang",
"Hong",
""
],
[
"Huang",
"Gang",
""
],
[
"Wilford",
"Paul",
""
]
] |
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] |
1402.0790
|
Philipp Singer
|
Philipp Singer, Denis Helic, Behnam Taraghi and Markus Strohmaier
|
Detecting Memory and Structure in Human Navigation Patterns Using Markov
Chain Models of Varying Order
| null |
PLoS ONE, vol 9(7), 2014
|
10.1371/journal.pone.0102070
| null |
cs.SI physics.soc-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
One of the most frequently used models for understanding human navigation on
the Web is the Markov chain model, where Web pages are represented as states
and hyperlinks as probabilities of navigating from one page to another.
Predominantly, human navigation on the Web has been thought to satisfy the
memoryless Markov property stating that the next page a user visits only
depends on her current page and not on previously visited ones. This idea has
found its way in numerous applications such as Google's PageRank algorithm and
others. Recently, new studies suggested that human navigation may better be
modeled using higher order Markov chain models, i.e., the next page depends on
a longer history of past clicks. Yet, this finding is preliminary and does not
account for the higher complexity of higher order Markov chain models which is
why the memoryless model is still widely used. In this work we thoroughly
present a diverse array of advanced inference methods for determining the
appropriate Markov chain order. We highlight strengths and weaknesses of each
method and apply them for investigating memory and structure of human
navigation on the Web. Our experiments reveal that the complexity of higher
order models grows faster than their utility, and thus we confirm that the
memoryless model represents a quite practical model for human navigation on a
page level. However, when we expand our analysis to a topical level, where we
abstract away from specific page transitions to transitions between topics, we
find that the memoryless assumption is violated and specific regularities can
be observed. We report results from experiments with two types of navigational
datasets (goal-oriented vs. free form) and observe interesting structural
differences that make a strong argument for more contextual studies of human
navigation in future work.
|
[
{
"created": "Tue, 4 Feb 2014 16:25:46 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Jun 2014 08:58:24 GMT",
"version": "v2"
}
] |
2014-07-15
|
[
[
"Singer",
"Philipp",
""
],
[
"Helic",
"Denis",
""
],
[
"Taraghi",
"Behnam",
""
],
[
"Strohmaier",
"Markus",
""
]
] |
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] |
1402.0791
|
Muir Kumph
|
Muir Kumph and Philip Holz and Kirsten Langer and Martin Meraner and
Michael Niedermayr and Michael Brownnutt and Rainer Blatt
|
Operation of a planar-electrode ion-trap array with adjustable RF
electrodes
|
17 pages, 8 figures
|
New J. Phys. 18 (2016) 023047
|
10.1088/1367-2630/18/2/023047
| null |
quant-ph physics.atom-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
One path to realizing systems of trapped atomic ions suitable for large-scale
quantum computing and simulation is to create a two-dimensional array of ion
traps. Interactions between nearest-neighbouring ions could then be turned on
and off by tuning the ions' relative positions and frequencies. We demonstrate
and characterize the operation of a planar-electrode ion-trap array. Driving
the trap with a network of phase-locked radio-frequency (RF) resonators which
provide independently variable voltage amplitudes we vary the position and
motional frequency of a 40Ca+ ion in two dimensions within the trap array. With
suitable miniaturization of the trap structure, this provides a viable
architecture for large-scale quantum simulations.
|
[
{
"created": "Tue, 4 Feb 2014 16:30:12 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Jul 2015 11:38:35 GMT",
"version": "v2"
}
] |
2018-05-04
|
[
[
"Kumph",
"Muir",
""
],
[
"Holz",
"Philip",
""
],
[
"Langer",
"Kirsten",
""
],
[
"Meraner",
"Martin",
""
],
[
"Niedermayr",
"Michael",
""
],
[
"Brownnutt",
"Michael",
""
],
[
"Blatt",
"Rainer",
""
]
] |
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] |
1402.0794
|
Anand Santhanakrishnan
|
S. Anand, Ofer Arazy, Narayan Mandayam and Oded Nov
|
A Game Theoretic Analysis of Collaboration in Wikipedia
|
16 pages 5 figures 2 tables
|
Proceedings of the 4th International Conference on Decision and
Game Theory for Security (GameSec 2013), LNCS 8252, pp. 29-44, Springer 2013
| null | null |
cs.GT cs.SI physics.soc-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Peer production projects such as Wikipedia or open-source software
development allow volunteers to collectively create knowledge based products.
The inclusive nature of such projects poses difficult challenges for ensuring
trustworthiness and combating vandalism. Prior studies in the area deal with
descriptive aspects of peer production, failing to capture the idea that while
contributors collaborate, they also compete for status in the community and for
imposing their views on the product. In this paper we investigate collaborative
authoring in Wikipedia where contributors append and overwrite previous
contributions to a page. We assume that a contributors goal is to maximize
ownership of content sections such that content owned (or originated) by her
survived the most recent revision of the page. We model contributors
interactions to increase their content ownership as a noncooperative game where
a players utility is associated with content owned and cost is a function of
effort expended. Our results capture several real life aspects of contributors
interactions within peer production projects. We show that at the Nash
equilibrium there is an inverse relationship between the effort required to
make a contribution and the survival of a contributors content. In other words
majority of the content that survives is necessarily contributed by experts who
expend relatively less effort than non experts. An empirical analysis of
Wikipedia articles provides support for our models predictions. Implications
for research and practice are discussed in the context of trustworthy
collaboration as well as vandalism.
|
[
{
"created": "Tue, 4 Feb 2014 16:48:07 GMT",
"version": "v1"
}
] |
2014-02-05
|
[
[
"Anand",
"S.",
""
],
[
"Arazy",
"Ofer",
""
],
[
"Mandayam",
"Narayan",
""
],
[
"Nov",
"Oded",
""
]
] |
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] |
1402.0796
|
Alexandre Lacoste
|
Alexandre Lacoste, Hugo Larochelle, Fran\c{c}ois Laviolette, Mario
Marchand
|
Sequential Model-Based Ensemble Optimization
| null | null | null | null |
cs.LG stat.ML
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
One of the most tedious tasks in the application of machine learning is model
selection, i.e. hyperparameter selection. Fortunately, recent progress has been
made in the automation of this process, through the use of sequential
model-based optimization (SMBO) methods. This can be used to optimize a
cross-validation performance of a learning algorithm over the value of its
hyperparameters. However, it is well known that ensembles of learned models
almost consistently outperform a single model, even if properly selected. In
this paper, we thus propose an extension of SMBO methods that automatically
constructs such ensembles. This method builds on a recently proposed ensemble
construction paradigm known as agnostic Bayesian learning. In experiments on 22
regression and 39 classification data sets, we confirm the success of this
proposed approach, which is able to outperform model selection with SMBO.
|
[
{
"created": "Tue, 4 Feb 2014 17:01:16 GMT",
"version": "v1"
}
] |
2014-02-05
|
[
[
"Lacoste",
"Alexandre",
""
],
[
"Larochelle",
"Hugo",
""
],
[
"Laviolette",
"François",
""
],
[
"Marchand",
"Mario",
""
]
] |
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] |
1402.0800
|
Larry Zamick
|
Brian Kleszyk and Larry Zamick
|
More on Asymptotic behaviors of 9j Coefficients
| null |
Phys. Rev. C89,044322 (2014)
|
10.1103/PhysRevC.89.044322
| null |
nucl-th physics.atm-clus physics.atom-ph quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Previouslywe noted in numerical calculations that a certain unitary ninej
coefficient U9j =((jj)^{2j} (jj)^{2j} | (jj)^{2j} (jj) ^{(2j-2)})^{I} decreases
with increasing j and for small I the decrease is of the form C j^{m}
e^{-\alpha j} . The exponential decay dominates. It is here shown that \alpha =
4 ln(2) and m=3/2.
|
[
{
"created": "Tue, 4 Feb 2014 17:20:21 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Feb 2014 04:17:48 GMT",
"version": "v2"
},
{
"created": "Fri, 14 Feb 2014 16:08:17 GMT",
"version": "v3"
},
{
"created": "Mon, 24 Feb 2014 16:39:46 GMT",
"version": "v4"
},
{
"created": "Thu, 27 Mar 2014 15:24:38 GMT",
"version": "v5"
},
{
"created": "Mon, 31 Mar 2014 03:32:34 GMT",
"version": "v6"
},
{
"created": "Tue, 1 Apr 2014 03:29:18 GMT",
"version": "v7"
},
{
"created": "Sat, 5 Apr 2014 20:06:19 GMT",
"version": "v8"
},
{
"created": "Mon, 28 Apr 2014 14:40:51 GMT",
"version": "v9"
}
] |
2015-06-18
|
[
[
"Kleszyk",
"Brian",
""
],
[
"Zamick",
"Larry",
""
]
] |
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] |
1402.0804
|
Antonio Fern\'andez Anta
|
Jordi Arjona, Angelos Chatzipapas, Antonio Fernandez Anta, Vincenzo
Mancuso
|
A Measurement-based Analysis of the Energy Consumption of Data Center
Servers
| null | null | null | null |
cs.DC cs.PF
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Energy consumption is a growing issue in data centers, impacting their
economic viability and their public image. In this work we empirically
characterize the power and energy consumed by different types of servers. In
particular, in order to understand the behavior of their energy and power
consumption, we perform measurements in different servers. In each of them, we
exhaustively measure the power consumed by the CPU, the disk, and the network
interface under different configurations, identifying the optimal operational
levels. One interesting conclusion of our study is that the curve that defines
the minimal CPU power as a function of the load is neither linear nor purely
convex as has been previously assumed. Moreover, we find that the efficiency of
the various server components can be maximized by tuning the CPU frequency and
the number of active cores as a function of the system and network load, while
the block size of I/O operations should be always maximized by applications. We
also show how to estimate the energy consumed by an application as a function
of some simple parameters, like the CPU load, and the disk and network
activity. We validate the proposed approach by accurately estimating the energy
of a map-reduce computation in a Hadoop platform.
|
[
{
"created": "Tue, 4 Feb 2014 17:40:38 GMT",
"version": "v1"
}
] |
2014-02-05
|
[
[
"Arjona",
"Jordi",
""
],
[
"Chatzipapas",
"Angelos",
""
],
[
"Anta",
"Antonio Fernandez",
""
],
[
"Mancuso",
"Vincenzo",
""
]
] |
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] |
1402.0808
|
Hooman Jarollahi
|
Hooman Jarollahi, Naoya Onizawa, Takahiro Hanyu, Warren J. Gross
|
Associative Memories Based on Multiple-Valued Sparse Clustered Networks
|
6 pages, Accepted in IEEE ISMVL 2014 conference
| null |
10.1109/ISMVL.2014.44
| null |
cs.NE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Associative memories are structures that store data patterns and retrieve
them given partial inputs. Sparse Clustered Networks (SCNs) are
recently-introduced binary-weighted associative memories that significantly
improve the storage and retrieval capabilities over the prior state-of-the art.
However, deleting or updating the data patterns result in a significant
increase in the data retrieval error probability. In this paper, we propose an
algorithm to address this problem by incorporating multiple-valued weights for
the interconnections used in the network. The proposed algorithm lowers the
error rate by an order of magnitude for our sample network with 60% deleted
contents. We then investigate the advantages of the proposed algorithm for
hardware implementations.
|
[
{
"created": "Mon, 3 Feb 2014 16:23:33 GMT",
"version": "v1"
}
] |
2016-11-18
|
[
[
"Jarollahi",
"Hooman",
""
],
[
"Onizawa",
"Naoya",
""
],
[
"Hanyu",
"Takahiro",
""
],
[
"Gross",
"Warren J.",
""
]
] |
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