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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
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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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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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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
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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
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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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