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1402.3483
Matija Pi\v{s}korec
Matija Pi\v{s}korec, Nino Antulov-Fantulin, Petra Kralj Novak, Igor Mozeti\v{c}, Miha Gr\v{c}ar, Irena Vodenska, Tomislav \v{S}muc
News Cohesiveness: an Indicator of Systemic Risk in Financial Markets
null
Scientific Reports 4: 5038 (2014)
10.1038/srep05038
null
cs.SI physics.soc-ph q-fin.ST
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Motivated by recent financial crises significant research efforts have been put into studying contagion effects and herding behaviour in financial markets. Much less has been said about influence of financial news on financial markets. We propose a novel measure of collective behaviour in financial news on the Web, News Cohesiveness Index (NCI), and show that it can be used as a systemic risk indicator. We evaluate the NCI on financial documents from large Web news sources on a daily basis from October 2011 to July 2013 and analyse the interplay between financial markets and financially related news. We hypothesized that strong cohesion in financial news reflects movements in the financial markets. Cohesiveness is more general and robust measure of systemic risk expressed in news, than measures based on simple occurrences of specific terms. Our results indicate that cohesiveness in the financial news is highly correlated with and driven by volatility on the financial markets.
[ { "created": "Fri, 14 Feb 2014 14:54:48 GMT", "version": "v1" } ]
2015-09-30
[ [ "Piškorec", "Matija", "" ], [ "Antulov-Fantulin", "Nino", "" ], [ "Novak", "Petra Kralj", "" ], [ "Mozetič", "Igor", "" ], [ "Grčar", "Miha", "" ], [ "Vodenska", "Irena", "" ], [ "Šmuc", "Tomislav", "" ] ]
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1402.3484
Anne-Kathrin Schmuck
Anne-Kathrin Schmuck and J\"org Raisch
Simulation and Bisimulation over Multiple Time Scales in a Behavioral Setting
Submitted to 22nd Mediterranean Conference on Control and Automation
null
null
null
cs.SY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper introduces a new behavioral system model with distinct external and internal signals possibly evolving on different time scales. This allows to capture abstraction processes or signal aggregation in the context of control and verification of large scale systems. For this new system model different notions of simulation and bisimulation are derived, ensuring that they are, respectively, preorders and equivalence relations for the system class under consideration. These relations can capture a wide selection of similarity notions available in the literature. This paper therefore provides a suitable framework for their comparison
[ { "created": "Fri, 14 Feb 2014 14:56:52 GMT", "version": "v1" } ]
2014-02-17
[ [ "Schmuck", "Anne-Kathrin", "" ], [ "Raisch", "Jörg", "" ] ]
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1402.3488
Artur Ziviani
Klaus Wehmuth (LNCC / MCTI), Artur Ziviani (LNCC / MCTI), Eric Fleury (ENS de Lyon / INRIA - Universit\'e de Lyon)
A Unifying Model for Representing Time-Varying Graphs
Also appears in the Proc. of the IEEE International Conference on Data Science and Advanced Analytics (IEEE DSAA'2015)
null
null
null
cs.DS cs.DM cs.SI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Graph-based models form a fundamental aspect of data representation in Data Sciences and play a key role in modeling complex networked systems. In particular, recently there is an ever-increasing interest in modeling dynamic complex networks, i.e. networks in which the topological structure (nodes and edges) may vary over time. In this context, we propose a novel model for representing finite discrete Time-Varying Graphs (TVGs), which are typically used to model dynamic complex networked systems. We analyze the data structures built from our proposed model and demonstrate that, for most practical cases, the asymptotic memory complexity of our model is in the order of the cardinality of the set of edges. Further, we show that our proposal is an unifying model that can represent several previous (classes of) models for dynamic networks found in the recent literature, which in general are unable to represent each other. In contrast to previous models, our proposal is also able to intrinsically model cyclic (i.e. periodic) behavior in dynamic networks. These representation capabilities attest the expressive power of our proposed unifying model for TVGs. We thus believe our unifying model for TVGs is a step forward in the theoretical foundations for data analysis of complex networked systems.
[ { "created": "Fri, 14 Feb 2014 15:10:16 GMT", "version": "v1" }, { "created": "Thu, 17 Sep 2015 14:17:51 GMT", "version": "v2" } ]
2015-09-18
[ [ "Wehmuth", "Klaus", "", "LNCC / MCTI" ], [ "Ziviani", "Artur", "", "LNCC / MCTI" ], [ "Fleury", "Eric", "", "ENS de Lyon / INRIA - Université de Lyon" ] ]
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1402.3490
Xinyang Deng
Xinyang Deng, Yong Deng
D numbers theory: a generalization of Dempster-Shafer theory
This paper has been withdrawn by the authors due to a crucial error of the combination rule
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null
null
cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Dempster-Shafer theory is widely applied to uncertainty modelling and knowledge reasoning due to its ability of expressing uncertain information. However, some conditions, such as exclusiveness hypothesis and completeness constraint, limit its development and application to a large extend. To overcome these shortcomings in Dempster-Shafer theory and enhance its capability of representing uncertain information, a novel theory called D numbers theory is systematically proposed in this paper. Within the proposed theory, uncertain information is expressed by D numbers, reasoning and synthesization of information are implemented by D numbers combination rule. The proposed D numbers theory is an generalization of Dempster-Shafer theory, which inherits the advantage of Dempster-Shafer theory and strengthens its capability of uncertainty modelling.
[ { "created": "Fri, 14 Feb 2014 15:15:26 GMT", "version": "v1" }, { "created": "Mon, 12 May 2014 15:47:48 GMT", "version": "v2" } ]
2014-05-13
[ [ "Deng", "Xinyang", "" ], [ "Deng", "Yong", "" ] ]
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1402.3494
Vladimir Shelistov
V.S. Shelistov, E.A. Demekhin, G.S. Ganchenko
Electrokinetic Instability near Charge-Selective Hydrophobic Surfaces
null
null
10.1103/PhysRevE.90.013001
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The influence of the texture of a hydrophobic surface on the electro-osmotic slip of the second kind and the electrokinetic instability near charge-selective surfaces (permselective membranes, electrodes, or systems of micro- and nanochannels) is investigated theoretically using a simple model based on the Rubinstein-Zaltzman approach. A simple formula is derived to evaluate the decrease in the instability threshold due to hydrophobicity. The study is complemented by numerical investigations both of linear and nonlinear instabilities near a hydrophobic membrane surface. Theory predicts a significant enhancement of the ion flux to the surface and shows a good qualitative agreement with the available experimental data.
[ { "created": "Fri, 14 Feb 2014 15:24:11 GMT", "version": "v1" } ]
2015-06-18
[ [ "Shelistov", "V. S.", "" ], [ "Demekhin", "E. A.", "" ], [ "Ganchenko", "G. S.", "" ] ]
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1402.3499
Ariel Cintron-Arias
Ariel Cintron-Arias
To Go Viral
null
null
null
null
physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Mathematical models are validated against empirical data, while examining potential indicators for an online video that went viral. We revisit some concepts of infectious disease modeling (e.g. reproductive number) and we comment on the role of model parameters that interplay in the spread of innovations. The dataset employed here provides strong evidence that the number of online views is governed by exponential growth patterns, explaining a common feature of viral videos.
[ { "created": "Fri, 14 Feb 2014 15:35:25 GMT", "version": "v1" } ]
2014-02-17
[ [ "Cintron-Arias", "Ariel", "" ] ]
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1402.3501
Jean-Guillaume Dumas
Jean-Guillaume Dumas (LJK), Thierry Gautier (INRIA Grenoble Rh\^one-Alpes / LIG Laboratoire d'Informatique de Grenoble), Cl\'ement Pernet (INRIA Grenoble Rh\^one-Alpes / LIG Laboratoire d'Informatique de Grenoble), Ziad Sultan (LJK, INRIA Grenoble Rh\^one-Alpes / LIG Laboratoire d'Informatique de Grenoble)
Parallel computation of echelon forms
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null
null
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cs.SC cs.DC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose efficient parallel algorithms and implementations on shared memory architectures of LU factorization over a finite field. Compared to the corresponding numerical routines, we have identified three main difficulties specific to linear algebra over finite fields. First, the arithmetic complexity could be dominated by modular reductions. Therefore, it is mandatory to delay as much as possible these reductions while mixing fine-grain parallelizations of tiled iterative and recursive algorithms. Second, fast linear algebra variants, e.g., using Strassen-Winograd algorithm, never suffer from instability and can thus be widely used in cascade with the classical algorithms. There, trade-offs are to be made between size of blocks well suited to those fast variants or to load and communication balancing. Third, many applications over finite fields require the rank profile of the matrix (quite often rank deficient) rather than the solution to a linear system. It is thus important to design parallel algorithms that preserve and compute this rank profile. Moreover, as the rank profile is only discovered during the algorithm, block size has then to be dynamic. We propose and compare several block decomposition: tile iterative with left-looking, right-looking and Crout variants, slab and tile recursive. Experiments demonstrate that the tile recursive variant performs better and matches the performance of reference numerical software when no rank deficiency occur. Furthermore, even in the most heterogeneous case, namely when all pivot blocks are rank deficient, we show that it is possbile to maintain a high efficiency.
[ { "created": "Fri, 14 Feb 2014 15:35:37 GMT", "version": "v1" } ]
2014-02-17
[ [ "Dumas", "Jean-Guillaume", "", "LJK" ], [ "Gautier", "Thierry", "", "INRIA Grenoble\n Rhône-Alpes / LIG Laboratoire d'Informatique de Grenoble" ], [ "Pernet", "Clément", "", "INRIA Grenoble Rhône-Alpes / LIG Laboratoire d'Informatique de Grenoble" ], [ "Sultan", "Ziad", "", "LJK, INRIA Grenoble Rhône-Alpes / LIG Laboratoire\n d'Informatique de Grenoble" ] ]
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1402.3503
Dmitry Semenov Dr.
Anne Dutrey (1), Dmitry Semenov (2), Edwige Chapillon (3), Uma Gorti (4), St\'ephane Guilloteau (1), Franck Hersant (1), Michiel Hogerheijde (5), Meredith Hughes (6), Gwendolyn Meeus (7), Hideko Nomura (8), Vincent Pi\'etu (9), Chunhua Qi (10), Valentine Wakelam (1) ((1) - Laboratoire d'Astrophysique de Bordeaux, CNRS, University of Bordeaux, France, (2) - Max-Planck-Institut f\"ur Astronomie, K\"onigstuhl, Heidelberg, Germany, (3) - Institute of Astronomy and Astrophysics, Academia Sinica, Taiwan, Republic of China, (4) - SETI Institute, 189 Bernardo Ave, Mountain View USA - NASA Ames Research Center, USA, (5) - Leiden Observatory, Leiden University, The Netherlands, (6) - Wesleyan University, Department of Astronomy, Van Vleck Observatory, USA, (7) - UAM, Dpto. Fisica Teurica, Mud.15, Fac. de Ciencias, Madrid, Spain, (8) - Department of Astronomy, Graduate School of Science, Kyoto University, Japan, (9) - IRAM 300 rue de la Piscine, Domaine Universitaire Saint Martin d'Heres, France, (10) - Harvard-Smithsonian Center for Astrophysics Cambridge, USA)
Physical and chemical structure of planet-forming disks probed by millimeter observations and modeling
24 pages, 4 figures, 1 table, accepted for publication as a chapter in Protostars and Planets VI, University of Arizona Press (2014), eds. H. Beuther, R. Klessen, C. Dullemond, Th. Henning
null
10.2458/azu_uapress_9780816531240-ch014
null
astro-ph.GA astro-ph.EP physics.space-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Protoplanetary disks composed of dust and gas are ubiquitous around young stars and are commonly recognized as nurseries of planetary systems. Their lifetime, appearance, and structure are determined by an interplay between stellar radiation, gravity, thermal pressure, magnetic field, gas viscosity, turbulence, and rotation. Molecules and dust serve as major heating and cooling agents in disks. Dust grains dominate the disk opacities, reprocess most of the stellar radiation, and shield molecules from ionizing UV/X-ray photons. Disks also dynamically evolve by building up planetary systems which drastically change their gas and dust density structures. Over the past decade significant progress has been achieved in our understanding of disk chemical composition thanks to the upgrade or advent of new millimeter/Infrared facilities (SMA, PdBI, CARMA, Herschel, e-VLA, ALMA). Some major breakthroughs in our comprehension of the disk physics and chemistry have been done since PPV. This review will present and discuss the impact of such improvements on our understanding of the disk physical structure and chemical composition.
[ { "created": "Fri, 14 Feb 2014 15:38:56 GMT", "version": "v1" } ]
2015-06-18
[ [ "Dutrey", "Anne", "" ], [ "Semenov", "Dmitry", "" ], [ "Chapillon", "Edwige", "" ], [ "Gorti", "Uma", "" ], [ "Guilloteau", "Stéphane", "" ], [ "Hersant", "Franck", "" ], [ "Hogerheijde", "Michiel", "" ], [ "Hughes", "Meredith", "" ], [ "Meeus", "Gwendolyn", "" ], [ "Nomura", "Hideko", "" ], [ "Piétu", "Vincent", "" ], [ "Qi", "Chunhua", "" ], [ "Wakelam", "Valentine", "" ] ]
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1402.3506
Anne-Kathrin Schmuck
Anne-Kathrin Schmuck and J\"org Raisch
Constructing (Bi)Similar Finite State Abstractions using Asynchronous $l$-Complete Approximations
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null
null
cs.SY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper constructs a finite state abstraction of a possibly continuous-time and infinite state model in two steps. First, a finite external signal space is added, generating a so called $\Phi$-dynamical system. Secondly, the strongest asynchronous $l$-complete approximation of the external dynamics is constructed. As our main results, we show that (i) the abstraction simulates the original system, and (ii) bisimilarity between the original system and its abstraction holds, if and only if the original system is $l$-complete and its state space satisfies an additional property.
[ { "created": "Fri, 14 Feb 2014 15:48:04 GMT", "version": "v1" }, { "created": "Mon, 17 Feb 2014 10:16:47 GMT", "version": "v2" }, { "created": "Thu, 13 Mar 2014 20:56:08 GMT", "version": "v3" } ]
2014-03-17
[ [ "Schmuck", "Anne-Kathrin", "" ], [ "Raisch", "Jörg", "" ] ]
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1402.3507
Igor Nefedov S
Igor Nefedov and Leonid Melnikov
Super-Planckian far-zone thermal emission from asymmetric hyperbolic metamaterials
11 pages, 6 figures
null
10.1063/1.4899126
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we demonstrate that asymmetric hyperbolic metamaterials (AHM) can produce strongly directive thermal emission in far-field zone, which exceeds Planck's limit. Asymmetry is inherent in an uniaxial medium, whose optical axes are tilted with respect to medium interfaces and appears as a difference in properties of waves, propagating upward and downward with respect to the interface. It's known that a high density of states (DOS) for certain photons takes place in usual hyperbolic metamaterials, but emission of them into a smaller number in vacuum is preserved by the total internal reflection. However, the use of AHM enhance the efficiency of coupling of the waves in AHM with the waves in free space that results in Super-Planckian far-field thermal emission in certain directions. Different plasmonic metamaterials can be used for realization of AHM. As example, thermal emission from AHM, based on graphene multilayer, is discussed.
[ { "created": "Fri, 14 Feb 2014 15:59:28 GMT", "version": "v1" } ]
2015-06-18
[ [ "Nefedov", "Igor", "" ], [ "Melnikov", "Leonid", "" ] ]
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1402.3508
Yvonne Pachmayer
Yvonne Pachmayer (for the ALICE Collaboration)
Particle Identification with the ALICE Transition Radiation Detector
4 pages; 7 figures, Proceedings of RICH2013 Conference, 2-6 Dec 2013
null
10.1016/j.nima.2014.05.002
null
physics.ins-det nucl-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Transition Radiation Detector (TRD) provides particle identification in the ALICE central barrel. In particular, it allows electron identification via the measurement of transition radiation for $\rm p >$ 1 GeV/$c$, where pions can no longer be rejected sufficiently via specific energy loss in the ALICE Time Projection Chamber. The ALICE TRD is uniquely designed to record the time evolution of the signal, which allows even better electron/pion separation. In addition, the electron identification capability of the TRD can be used on-line to trigger at level 1. The particle identification and its performance in pp, p-Pb and Pb-Pb collisions employing various methods, such as truncated mean signal, one- and two-dimensional likelihood on integrated charge and neural network, will be presented. The measurement of J/$\psi$ mesons in Pb-Pb collisions is given as a case study to show how well the TRD contributes to physics analyses due to its excellent pion suppression.
[ { "created": "Fri, 14 Feb 2014 15:59:29 GMT", "version": "v1" } ]
2019-08-21
[ [ "Pachmayer", "Yvonne", "", "for the ALICE Collaboration" ] ]
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1402.3511
Jan Koutn\'ik
Jan Koutn\'ik, Klaus Greff, Faustino Gomez, J\"urgen Schmidhuber
A Clockwork RNN
null
null
null
null
cs.NE cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Sequence prediction and classification are ubiquitous and challenging problems in machine learning that can require identifying complex dependencies between temporally distant inputs. Recurrent Neural Networks (RNNs) have the ability, in theory, to cope with these temporal dependencies by virtue of the short-term memory implemented by their recurrent (feedback) connections. However, in practice they are difficult to train successfully when the long-term memory is required. This paper introduces a simple, yet powerful modification to the standard RNN architecture, the Clockwork RNN (CW-RNN), in which the hidden layer is partitioned into separate modules, each processing inputs at its own temporal granularity, making computations only at its prescribed clock rate. Rather than making the standard RNN models more complex, CW-RNN reduces the number of RNN parameters, improves the performance significantly in the tasks tested, and speeds up the network evaluation. The network is demonstrated in preliminary experiments involving two tasks: audio signal generation and TIMIT spoken word classification, where it outperforms both RNN and LSTM networks.
[ { "created": "Fri, 14 Feb 2014 16:05:12 GMT", "version": "v1" } ]
2014-02-17
[ [ "Koutník", "Jan", "" ], [ "Greff", "Klaus", "" ], [ "Gomez", "Faustino", "" ], [ "Schmidhuber", "Jürgen", "" ] ]
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A Clockwork RNN
http://arxiv.org/abs/1402.3511v1
http://arxiv.org/pdf/1402.3511v1.pdf
https://github.com/SylvanLiu/ExchangeRatePrediction
false
false
https://paperswithcode.com/paper/a-clockwork-rnn
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1402.3517
Jennifer Noble
Jennifer A Noble, C\'eline Martin, Helen J. Fraser, Pascale Roubin and St\'ephane Coussan
Unveiling the Surface Structure of Amorphous Solid Water via Selective Infrared Irradiation of OH Stretching Modes
11 pages, 4 figures, 1 table. Accepted for publication in the Journal of Physical Chemistry Letters
null
10.1021/jz5000066
null
physics.chem-ph astro-ph.SR cond-mat.mtrl-sci
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In the quest to understand the formation of the building blocks of life, amorphous solid water (ASW) is one of the most widely studied molecular systems. Indeed, ASW is ubiquitous in the cold interstellar medium (ISM), where ASW-coated dust grains provide a catalytic surface for solid phase chemistry, and is believed to be present in the Earth's atmosphere at high altitudes. It has been shown that the ice surface adsorbs small molecules such as CO, N$_2$, or CH$_4$, most likely at OH groups dangling from the surface. Our study presents completely new insights concerning the behaviour of ASW upon selective infrared (IR) irradiation of its dangling modes. When irradiated, these surface H$_2$O molecules reorganise, predominantly forming a stabilised monomer-like water mode on the ice surface. We show that we systematically provoke "hole-burning" effects (or net loss of oscillators) at the wavelength of irradiation and reproduce the same absorbed water monomer on the ASW surface. Our study suggests that all dangling modes share one common channel of vibrational relaxation; the ice remains amorphous but with a reduced range of binding sites, and thus an altered catalytic capacity.
[ { "created": "Fri, 14 Feb 2014 16:15:54 GMT", "version": "v1" } ]
2014-02-17
[ [ "Noble", "Jennifer A", "" ], [ "Martin", "Céline", "" ], [ "Fraser", "Helen J.", "" ], [ "Roubin", "Pascale", "" ], [ "Coussan", "Stéphane", "" ] ]
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1402.3520
Alexandre Graell i Amat Dr.
Stefan Schwandter and Alexandre Graell i Amat and Gerald Matz
Spatially-Coupled LDPC Codes for Decode-and-Forward Relaying of Two Correlated Sources over the BEC
IEEE Transactions on Communications, to appear
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a decode-and-forward transmission scheme based on spatially-coupled low-density parity-check (SC-LDPC) codes for a network consisting of two (possibly correlated) sources, one relay, and one destination. The links between the nodes are modeled as binary erasure channels. Joint source-channel coding with joint channel decoding is used to exploit the correlation. The relay performs network coding. We derive analytical bounds on the achievable rates for the binary erasure time-division multiple-access relay channel with correlated sources. We then design bilayer SC-LDPC codes and analyze their asymptotic performance for this scenario. We prove analytically that the proposed coding scheme achieves the theoretical limit for symmetric channel conditions and uncorrelated sources. Using density evolution, we furthermore demonstrate that our scheme approaches the theoretical limit also for non-symmetric channel conditions and when the sources are correlated, and we observe the threshold saturation effect that is typical for spatially-coupled systems. Finally, we give simulation results for large block lengths, which validate the DE analysis.
[ { "created": "Fri, 14 Feb 2014 16:27:50 GMT", "version": "v1" } ]
2014-02-17
[ [ "Schwandter", "Stefan", "" ], [ "Amat", "Alexandre Graell i", "" ], [ "Matz", "Gerald", "" ] ]
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1402.3528
Pierluigi Poggiolini
P. Poggiolini, G. Bosco, A. Carena, V. Curri, Y. Jiang, F. Forghieri
A Simple and Effective Closed-Form GN-Model Correction Formula Accounting for Signal Non-Gaussian Distribution
This paper has been accepted for publication in the IEEE Journal of Lightwave Technology
null
10.1109/JLT.2014.2387891
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The GN model of non-linear fiber propagation has been shown to overestimate the variance of non-linearity due to the signal Gaussianity approximation, leading to maximum reach predictions for realistic optical systems which may be pessimistic by about 5% to 15%, depending on fiber type and system set-up. Analytical corrections have been proposed, which however substantially increase the model complexity. In this paper we provide a simple closed-form GN model correction formula, derived from the EGN model, which we show to be quite effective in correcting for the GN model tendency to overestimate non-linearity. The formula also permits to clearly identify the correction dependence on key system parameters, such as span length and loss.
[ { "created": "Fri, 14 Feb 2014 16:58:53 GMT", "version": "v1" }, { "created": "Mon, 17 Feb 2014 18:06:55 GMT", "version": "v2" }, { "created": "Wed, 26 Feb 2014 17:55:04 GMT", "version": "v3" }, { "created": "Fri, 1 Aug 2014 08:24:18 GMT", "version": "v4" }, { "created": "Tue, 30 Dec 2014 12:38:26 GMT", "version": "v5" }, { "created": "Wed, 14 Jan 2015 15:22:26 GMT", "version": "v6" } ]
2015-06-18
[ [ "Poggiolini", "P.", "" ], [ "Bosco", "G.", "" ], [ "Carena", "A.", "" ], [ "Curri", "V.", "" ], [ "Jiang", "Y.", "" ], [ "Forghieri", "F.", "" ] ]
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1402.3542
Zhihai Rong
Liming Pan, Dong Hao, Zhihai Rong, and Tao Zhou
Zero-Determinant Strategies in the Iterated Public Goods Game
10 pages, 6 figures
null
null
null
cs.GT physics.soc-ph q-bio.PE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Recently, Press and Dyson have proposed a new class of probabilistic and conditional strategies for the two-player iterated Prisoner's Dilemma, so-called zero-determinant strategies. A player adopting zero-determinant strategies is able to pin the expected payoff of the opponents or to enforce a linear relationship between his own payoff and the opponents' payoff, in a unilateral way. This paper considers zero-determinant strategies in the iterated public goods game, a representative multi-player evolutionary game where in each round each player will choose whether or not put his tokens into a public pot, and the tokens in this pot are multiplied by a factor larger than one and then evenly divided among all players. The analytical and numerical results exhibit a similar yet different scenario to the case of two-player games: (i) with small number of players or a small multiplication factor, a player is able to unilaterally pin the expected total payoff of all other players; (ii) a player is able to set the ratio between his payoff and the total payoff of all other players, but this ratio is limited by an upper bound if the multiplication factor exceeds a threshold that depends on the number of players.
[ { "created": "Fri, 14 Feb 2014 17:54:33 GMT", "version": "v1" } ]
2014-02-17
[ [ "Pan", "Liming", "" ], [ "Hao", "Dong", "" ], [ "Rong", "Zhihai", "" ], [ "Zhou", "Tao", "" ] ]
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1402.3543
Parikshit Gopalan
Parikshit Gopalan and Amir Yehudayoff
Inequalities and tail bounds for elementary symmetric polynomial with applications
null
null
null
null
cs.CC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the extent of independence needed to approximate the product of bounded random variables in expectation, a natural question that has applications in pseudorandomness and min-wise independent hashing. For random variables whose absolute value is bounded by $1$, we give an error bound of the form $\sigma^{\Omega(k)}$ where $k$ is the amount of independence and $\sigma^2$ is the total variance of the sum. Previously known bounds only applied in more restricted settings, and were quanitively weaker. We use this to give a simpler and more modular analysis of a construction of min-wise independent hash functions and pseudorandom generators for combinatorial rectangles due to Gopalan et al., which also slightly improves their seed-length. Our proof relies on a new analytic inequality for the elementary symmetric polynomials $S_k(x)$ for $x \in \mathbb{R}^n$ which we believe to be of independent interest. We show that if $|S_k(x)|,|S_{k+1}(x)|$ are small relative to $|S_{k-1}(x)|$ for some $k>0$ then $|S_\ell(x)|$ is also small for all $\ell > k$. From these, we derive tail bounds for the elementary symmetric polynomials when the inputs are only $k$-wise independent.
[ { "created": "Fri, 14 Feb 2014 18:17:42 GMT", "version": "v1" }, { "created": "Mon, 10 Aug 2015 21:33:14 GMT", "version": "v2" } ]
2015-08-12
[ [ "Gopalan", "Parikshit", "" ], [ "Yehudayoff", "Amir", "" ] ]
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1402.3545
Eike Hermann M\"uller
Eike Hermann M\"uller, Robert Scheichl, Eero Vainikko
Petascale elliptic solvers for anisotropic PDEs on GPU clusters
20 pages, 6 figures. Additional explanations and clarifications of the characteristics of the PDE; discussion and estimate of the condition number. Added section and figure on the robustness of both the single-level and the multigrid method under variations of the Courant number. Clarified the terminology in the performance analysis. Added section on preliminary strong scaling results
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cs.DC cs.NA math.NA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Memory bound applications such as solvers for large sparse systems of equations remain a challenge for GPUs. Fast solvers should be based on numerically efficient algorithms and implemented such that global memory access is minimised. To solve systems with up to one trillion ($10^{12}$) unknowns the code has to make efficient use of several million individual processor cores on large GPU clusters. We describe the multi-GPU implementation of two algorithmically optimal iterative solvers for anisotropic elliptic PDEs which are encountered in atmospheric modelling. In this application the condition number is large but independent of the grid resolution and both methods are asymptotically optimal, albeit with different absolute performance. We parallelise the solvers and adapt them to the specific features of GPU architectures, paying particular attention to efficient global memory access. We achieve a performance of up to 0.78 PFLOPs when solving an equation with $0.55\cdot 10^{12}$ unknowns on 16384 GPUs; this corresponds to about $3\%$ of the theoretical peak performance of the machine and we use more than $40\%$ of the peak memory bandwidth with a Conjugate Gradient (CG) solver. Although the other solver, a geometric multigrid algorithm, has a slightly worse performance in terms of FLOPs per second, overall it is faster as it needs less iterations to converge; the multigrid algorithm can solve a linear PDE with half a trillion unknowns in about one second.
[ { "created": "Fri, 14 Feb 2014 18:30:04 GMT", "version": "v1" }, { "created": "Fri, 29 May 2015 10:56:36 GMT", "version": "v2" } ]
2015-06-01
[ [ "Müller", "Eike Hermann", "" ], [ "Scheichl", "Robert", "" ], [ "Vainikko", "Eero", "" ] ]
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1402.3547
Meirav Zehavi
Hadas Shachnai, Meirav Zehavi
Representative Families: A Unified Tradeoff-Based Approach
null
null
null
null
cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let $M=(E,{\cal I})$ be a matroid, and let $\cal S$ be a family of subsets of size $p$ of $E$. A subfamily $\widehat{\cal S}\subseteq{\cal S}$ represents ${\cal S}$ if for every pair of sets $X\in{\cal S}$ and $Y\subseteq E\setminus X$ such that $X\cup Y\in{\cal I}$, there is a set $\widehat{X}\in\widehat{\cal S}$ disjoint from $Y$ such that $\widehat{X}\cup Y\in{\cal I}$. Fomin et al. (Proc. ACM-SIAM Symposium on Discrete Algorithms, 2014) introduced a powerful technique for fast computation of representative families for uniform matroids. In this paper, we show that this technique leads to a unified approach for substantially improving the running times of parameterized algorithms for some classic problems. This includes, among others, $k$-Partial Cover, $k$-Internal Out-Branching, and Long Directed Cycle. Our approach exploits an interesting tradeoff between running time and the size of the representative families.
[ { "created": "Fri, 14 Feb 2014 18:32:15 GMT", "version": "v1" }, { "created": "Sat, 19 Apr 2014 17:46:10 GMT", "version": "v2" } ]
2014-04-22
[ [ "Shachnai", "Hadas", "" ], [ "Zehavi", "Meirav", "" ] ]
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1402.3549
Xiajun Wang
Xiajun Wang, Song Huang, Song Fu and Krishna Kavi
Characterizing Workload of Web Applications on Virtualized Servers
8 pages, 8 figures, The Fourth Workshop on Big Data Benchmarks, Performance Optimization, and Emerging Hardware in conjunction with the 19th ACM International Conference on Architectural Support for Programming Languages and Operating Systems (ASPLOS-2014), Salt Lake City, Utah, USA, March 1-5, 2014
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null
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cs.PF cs.DC
http://creativecommons.org/licenses/by/3.0/
With the ever increasing demands of cloud computing services, planning and management of cloud resources has become a more and more important issue which directed affects the resource utilization and SLA and customer satisfaction. But before any management strategy is made, a good understanding of applications' workload in virtualized environment is the basic fact and principle to the resource management methods. Unfortunately, little work has been focused on this area. Lack of raw data could be one reason; another reason is that people still use the traditional models or methods shared under non-virtualized environment. The study of applications' workload in virtualized environment should take on some of its peculiar features comparing to the non-virtualized environment. In this paper, we are open to analyze the workload demands that reflect applications' behavior and the impact of virtualization. The results are obtained from an experimental cloud testbed running web applications, specifically the RUBiS benchmark application. We profile the workload dynamics on both virtualized and non-virtualized environments and compare the findings. The experimental results are valuable for us to estimate the performance of applications on computer architectures, to predict SLA compliance or violation based on the projected application workload and to guide the decision making to support applications with the right hardware.
[ { "created": "Fri, 14 Feb 2014 18:51:38 GMT", "version": "v1" } ]
2014-02-17
[ [ "Wang", "Xiajun", "" ], [ "Huang", "Song", "" ], [ "Fu", "Song", "" ], [ "Kavi", "Krishna", "" ] ]
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1402.3557
Subarna Tripathi
Subarna Tripathi, Youngbae Hwang, Serge Belongie, Truong Nguyen
Improving Streaming Video Segmentation with Early and Mid-Level Visual Processing
WACV accepted paper
null
null
null
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Despite recent advances in video segmentation, many opportunities remain to improve it using a variety of low and mid-level visual cues. We propose improvements to the leading streaming graph-based hierarchical video segmentation (streamGBH) method based on early and mid level visual processing. The extensive experimental analysis of our approach validates the improvement of hierarchical supervoxel representation by incorporating motion and color with effective filtering. We also pose and illuminate some open questions towards intermediate level video analysis as further extension to streamGBH. We exploit the supervoxels as an initialization towards estimation of dominant affine motion regions, followed by merging of such motion regions in order to hierarchically segment a video in a novel motion-segmentation framework which aims at subsequent applications such as foreground recognition.
[ { "created": "Fri, 14 Feb 2014 19:37:35 GMT", "version": "v1" } ]
2014-02-17
[ [ "Tripathi", "Subarna", "" ], [ "Hwang", "Youngbae", "" ], [ "Belongie", "Serge", "" ], [ "Nguyen", "Truong", "" ] ]
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1402.3573
Ioannis Papoutsakis
Ioannis Papoutsakis
Tree 3-spanners of diameter at most 5
null
null
null
null
cs.DM cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Tree spanners approximate distances within graphs; a subtree of a graph is a tree $t$-spanner of the graph if and only if for every pair of vertices their distance in the subtree is at most $t$ times their distance in the graph. When a graph contains a subtree of diameter at most $t$, then trivially admits a tree $t$-spanner. Now, determining whether a graph admits a tree $t$-spanner of diameter at most $t+1$ is an NP complete problem, when $t\geq 4$, and it is tractable, when $t\leq 3$. Although it is not known whether it is tractable to decide graphs that admit a tree 3-spanner of any diameter, an efficient algorithm to determine graphs that admit a tree 3-spanner of diameter at most 5 is presented. Moreover, it is proved that if a graph of diameter at most 3 admits a tee 3-spanner, then it admits a tree 3-spanner of diameter at most 5. Hence, this algorithm decides tree 3-spanner admissibility of diameter at most 3 graphs.
[ { "created": "Fri, 14 Feb 2014 20:28:20 GMT", "version": "v1" }, { "created": "Tue, 19 May 2015 17:38:24 GMT", "version": "v2" } ]
2015-05-20
[ [ "Papoutsakis", "Ioannis", "" ] ]
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1402.3578
Cezary Kaliszyk
Cezary Kaliszyk and Josef Urban
Learning-assisted Theorem Proving with Millions of Lemmas
journal version of arXiv:1310.2797 (which was submitted to LPAR conference)
null
null
null
cs.AI cs.DL cs.LG cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Large formal mathematical libraries consist of millions of atomic inference steps that give rise to a corresponding number of proved statements (lemmas). Analogously to the informal mathematical practice, only a tiny fraction of such statements is named and re-used in later proofs by formal mathematicians. In this work, we suggest and implement criteria defining the estimated usefulness of the HOL Light lemmas for proving further theorems. We use these criteria to mine the large inference graph of the lemmas in the HOL Light and Flyspeck libraries, adding up to millions of the best lemmas to the pool of statements that can be re-used in later proofs. We show that in combination with learning-based relevance filtering, such methods significantly strengthen automated theorem proving of new conjectures over large formal mathematical libraries such as Flyspeck.
[ { "created": "Tue, 11 Feb 2014 03:08:02 GMT", "version": "v1" } ]
2014-02-17
[ [ "Kaliszyk", "Cezary", "" ], [ "Urban", "Josef", "" ] ]
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1402.3585
Christopher Gilbreth
C. N. Gilbreth, Y. Alhassid
Stabilizing Canonical-Ensemble Calculations in the Auxiliary-Field Monte Carlo Method
17 pages, 2 figures
null
10.1016/j.cpc.2014.09.002
null
physics.comp-ph cond-mat.quant-gas nucl-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Quantum Monte Carlo methods are powerful techniques for studying strongly interacting Fermi systems. However, implementing these methods on computers with finite-precision arithmetic requires careful attention to numerical stability. In the auxiliary-field Monte Carlo (AFMC) method, low-temperature or large-model-space calculations require numerically stabilized matrix multiplication. When adapting methods used in the grand-canonical ensemble to the canonical ensemble of fixed particle number, the numerical stabilization increases the number of required floating-point operations for computing observables by a factor of the size of the single-particle model space, and thus can greatly limit the systems that can be studied. We describe an improved method for stabilizing canonical-ensemble calculations in AFMC that exhibits better scaling, and present numerical tests that demonstrate the accuracy and improved performance of the method.
[ { "created": "Fri, 14 Feb 2014 20:50:12 GMT", "version": "v1" } ]
2015-05-20
[ [ "Gilbreth", "C. N.", "" ], [ "Alhassid", "Y.", "" ] ]
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1402.3588
G\'abor V\'as\'arhelyi
G\'abor V\'as\'arhelyi and Csaba Vir\'agh and Gerg\H{o} Somorjai and Norbert Tarcai and Tam\'as Sz\"or\'enyi and Tam\'as Nepusz and Tam\'as Vicsek
Outdoor flocking and formation flight with autonomous aerial robots
Accepted @ IROS 2014 conference
null
null
null
cs.RO cs.MA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present the first decentralized multi-copter flock that performs stable autonomous outdoor flight with up to 10 flying agents. By decentralized and autonomous we mean that all members navigate themselves based on the dynamic information received from other robots in the vicinity. We do not use central data processing or control; instead, all the necessary computations are carried out by miniature on-board computers. The only global information the system exploits is from GPS receivers, while the units use wireless modules to share this positional information with other flock members locally. Collective behavior is based on a decentralized control framework with bio-inspiration from statistical physical modelling of animal swarms. In addition, the model is optimized for stable group flight even in a noisy, windy, delayed and error-prone environment. Using this framework we successfully implemented several fundamental collective flight tasks with up to 10 units: i) we achieved self-propelled flocking in a bounded area with self-organized object avoidance capabilities and ii) performed collective target tracking with stable formation flights (grid, rotating ring, straight line). With realistic numerical simulations we demonstrated that the local broadcast-type communication and the decentralized autonomous control method allows for the scalability of the model for much larger flocks.
[ { "created": "Fri, 14 Feb 2014 15:53:44 GMT", "version": "v1" }, { "created": "Fri, 4 Jul 2014 14:56:08 GMT", "version": "v2" } ]
2014-07-07
[ [ "Vásárhelyi", "Gábor", "" ], [ "Virágh", "Csaba", "" ], [ "Somorjai", "Gergő", "" ], [ "Tarcai", "Norbert", "" ], [ "Szörényi", "Tamás", "" ], [ "Nepusz", "Tamás", "" ], [ "Vicsek", "Tamás", "" ] ]
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1402.3596
Callum Doolin
C. Doolin, B.D. Hauer, P.H. Kim, A.J.R. MacDonald, H. Ramp, and J.P. Davis
Nonlinear optomechanics in the stationary regime
6 pages, 5 figures
Phys. Rev. A 89, 053838 (2014)
10.1103/PhysRevA.89.053838
null
cond-mat.mes-hall physics.optics quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We have observed nonlinear transduction of the thermomechanical motion of a nanomechanical resonator when detected as laser transmission through a sideband unresolved optomechanical cavity. Nonlinear detection mechanisms are of considerable interest as special cases allow for quantum nondemolition measurements of the mechanical resonator's energy. We investigate the origin of the nonlinearity in the optomechanical detection apparatus and derive a theoretical framework for the nonlinear signal transduction, and the optical spring effect, from both nonlinearities in the optical transfer function and second order optomechanical coupling. By measuring the dependence of the linear and nonlinear signal transduction -- as well as the mechanical frequency shift -- on laser detuning from optical resonance, we provide estimates of the contributions from the linear and quadratic optomechanical couplings.
[ { "created": "Fri, 14 Feb 2014 21:00:20 GMT", "version": "v1" } ]
2014-12-25
[ [ "Doolin", "C.", "" ], [ "Hauer", "B. D.", "" ], [ "Kim", "P. H.", "" ], [ "MacDonald", "A. J. R.", "" ], [ "Ramp", "H.", "" ], [ "Davis", "J. P.", "" ] ]
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1402.3606
Ragavendran Gopalakrishnan
Ragavendran Gopalakrishnan and Sherwin Doroudi and Amy R. Ward and Adam Wierman
Routing and Staffing when Servers are Strategic
First submitted for journal publication in 2014; accepted for publication in Operations Research in 2016. Presented in select conferences throughout 2014
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cs.GT cs.SY math.OC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Traditionally, research focusing on the design of routing and staffing policies for service systems has modeled servers as having fixed (possibly heterogeneous) service rates. However, service systems are generally staffed by people. Furthermore, people respond to workload incentives; that is, how hard a person works can depend both on how much work there is, and how the work is divided between the people responsible for it. In a service system, the routing and staffing policies control such workload incentives; and so the rate servers work will be impacted by the system's routing and staffing policies. This observation has consequences when modeling service system performance, and our objective is to investigate those consequences. We do this in the context of the M/M/N queue, which is the canonical model for large service systems. First, we present a model for "strategic" servers that choose their service rate in order to maximize a trade-off between an "effort cost", which captures the idea that servers exert more effort when working at a faster rate, and a "value of idleness", which assumes that servers value having idle time. Next, we characterize the symmetric Nash equilibrium service rate under any routing policy that routes based on the server idle time. We find that the system must operate in a quality-driven regime, in which servers have idle time, in order for an equilibrium to exist, which implies that the staffing must have a first-order term that strictly exceeds that of the common square-root staffing policy. Then, within the class of policies that admit an equilibrium, we (asymptotically) solve the problem of minimizing the total cost, when there are linear staffing costs and linear waiting costs. Finally, we end by exploring the question of whether routing policies that are based on the service rate, instead of the server idle time, can improve system performance.
[ { "created": "Fri, 14 Feb 2014 21:21:14 GMT", "version": "v1" }, { "created": "Sat, 27 Dec 2014 04:31:44 GMT", "version": "v2" }, { "created": "Mon, 10 Aug 2015 17:22:42 GMT", "version": "v3" }, { "created": "Wed, 23 Mar 2016 17:54:52 GMT", "version": "v4" } ]
2016-03-24
[ [ "Gopalakrishnan", "Ragavendran", "" ], [ "Doroudi", "Sherwin", "" ], [ "Ward", "Amy R.", "" ], [ "Wierman", "Adam", "" ] ]
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1402.3609
Reut Levi
Reut Levi, Dana Ron, Ronitt Rubinfeld
Local Algorithms for Sparse Spanning Graphs
Upper bounds for expanding graphs and minor free graphs
null
null
null
cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Constructing a spanning tree of a graph is one of the most basic tasks in graph theory. We consider a relaxed version of this problem in the setting of local algorithms. The relaxation is that the constructed subgraph is a sparse spanning subgraph containing at most $(1+\epsilon)n$ edges (where $n$ is the number of vertices and $\epsilon$ is a given approximation/sparsity parameter). In the local setting, the goal is to quickly determine whether a given edge $e$ belongs to such a subgraph, without constructing the whole subgraph, but rather by inspecting (querying) the local neighborhood of $e$. The challenge is to maintain consistency. That is, to provide answers concerning different edges according to the same spanning subgraph. We first show that for general bounded-degree graphs, the query complexity of any such algorithm must be $\Omega(\sqrt{n})$. This lower bound holds for constant-degree graphs that have high expansion. Next we design an algorithm for (bounded-degree) graphs with high expansion, obtaining a result that roughly matches the lower bound. We then turn to study graphs that exclude a fixed minor (and are hence non-expanding). We design an algorithm for such graphs, which may have an unbounded maximum degree. The query complexity of this algorithm is $poly(1/\epsilon, h)$ (independent of $n$ and the maximum degree), where $h$ is the number of vertices in the excluded minor. Though our two algorithms are designed for very different types of graphs (and have very different complexities), on a high-level there are several similarities, and we highlight both the similarities and the differences.
[ { "created": "Fri, 14 Feb 2014 21:36:27 GMT", "version": "v1" }, { "created": "Tue, 18 Jul 2017 21:40:42 GMT", "version": "v2" }, { "created": "Tue, 27 Apr 2021 13:57:14 GMT", "version": "v3" } ]
2021-04-28
[ [ "Levi", "Reut", "" ], [ "Ron", "Dana", "" ], [ "Rubinfeld", "Ronitt", "" ] ]
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1402.3610
Ragavendran Gopalakrishnan
Ragavendran Gopalakrishnan and Jason R. Marden and Adam Wierman
Potential Games are Necessary to Ensure Pure Nash Equilibria in Cost Sharing Games
Presented at various conferences in 2013. Accepted for journal publication in December 2013
null
null
null
cs.GT cs.MA cs.SY math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider the problem of designing distribution rules to share "welfare" (cost or revenue) among individually strategic agents. There are many known distribution rules that guarantee the existence of a (pure) Nash equilibrium in this setting, e.g., the Shapley value and its weighted variants; however, a characterization of the space of distribution rules that guarantee the existence of a Nash equilibrium is unknown. Our work provides an exact characterization of this space for a specific class of scalable and separable games, which includes a variety of applications such as facility location, routing, network formation, and coverage games. Given arbitrary local welfare functions W, we prove that a distribution rule guarantees equilibrium existence for all games (i.e., all possible sets of resources, agent action sets, etc.) if and only if it is equivalent to a generalized weighted Shapley value on some "ground" welfare functions W', which can be distinct from W. However, if budget-balance is required in addition to the existence of a Nash equilibrium, then W' must be the same as W. We also provide an alternate characterization of this space in terms of "generalized" marginal contributions, which is more appealing from the point of view of computational tractability. A possibly surprising consequence of our result is that, in order to guarantee equilibrium existence in all games with any fixed local welfare functions, it is necessary to work within the class of potential games.
[ { "created": "Fri, 14 Feb 2014 21:37:48 GMT", "version": "v1" } ]
2014-02-18
[ [ "Gopalakrishnan", "Ragavendran", "" ], [ "Marden", "Jason R.", "" ], [ "Wierman", "Adam", "" ] ]
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1402.3611
Kangjin Kim
Kangjin Kim and Georgios Fainekos
Revision of Specification Automata under Quantitative Preferences
9 pages, 3 figures, 3 tables, in Proceedings of the IEEE Conference on Robotics and Automation, May 2014
null
null
null
cs.FL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the problem of revising specifications with preferences for automata based control synthesis problems. In this class of revision problems, the user provides a numerical ranking of the desirability of the subgoals in their specifications. When the specification cannot be satisfied on the system, then our algorithms automatically revise the specification so that the least desirable user goals are removed from the specification. We propose two different versions of the revision problem with preferences. In the first version, the algorithm returns an exact solution while in the second version the algorithm is an approximation algorithm with non-constant approximation ratio. Finally, we demonstrate the scalability of our algorithms and we experimentally study the approximation ratio of the approximation algorithm on random problem instances.
[ { "created": "Fri, 14 Feb 2014 21:47:56 GMT", "version": "v1" } ]
2014-02-18
[ [ "Kim", "Kangjin", "" ], [ "Fainekos", "Georgios", "" ] ]
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1402.3612
Marian Boguna
Guillermo Garcia-Perez, M. Angeles Serrano and Marian Boguna
The complex architecture of primes and natural numbers
null
Phys. Rev. E 90, 022806 (2014)
10.1103/PhysRevE.90.022806
null
math.NT physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Natural numbers can be divided in two non-overlapping infinite sets, primes and composites, with composites factorizing into primes. Despite their apparent simplicity, the elucidation of the architecture of natural numbers with primes as building blocks remains elusive. Here, we propose a new approach to decoding the architecture of natural numbers based on complex networks and stochastic processes theory. We introduce a parameter-free non-Markovian dynamical model that naturally generates random primes and their relation with composite numbers with remarkable accuracy. Our model satisfies the prime number theorem as an emerging property and a refined version of Cram\'er's conjecture about the statistics of gaps between consecutive primes that seems closer to reality than the original Cram\'er's version. Regarding composites, the model helps us to derive the prime factors counting function, giving the probability of distinct prime factors for any integer. Probabilistic models like ours can help to get deeper insights about primes and the complex architecture of natural numbers.
[ { "created": "Fri, 14 Feb 2014 21:56:16 GMT", "version": "v1" }, { "created": "Thu, 24 Jul 2014 11:05:51 GMT", "version": "v2" } ]
2014-10-21
[ [ "Garcia-Perez", "Guillermo", "" ], [ "Serrano", "M. Angeles", "" ], [ "Boguna", "Marian", "" ] ]
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1402.3613
Pavel Janovsk\'y
Pavel Janovsk\'y and Michal \v{C}\'ap and Ji\v{r}\'i Vok\v{r}\'inek
Finding Coordinated Paths for Multiple Holonomic Agents in 2-d Polygonal Environment
Proceedings of the 13th International Conference on Autonomous Agents and Multiagent Systems (AAMAS 2014)
null
null
null
cs.AI cs.RO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Avoiding collisions is one of the vital tasks for systems of autonomous mobile agents. We focus on the problem of finding continuous coordinated paths for multiple mobile disc agents in a 2-d environment with polygonal obstacles. The problem is PSPACE-hard, with the state space growing exponentially in the number of agents. Therefore, the state of the art methods include mainly reactive techniques and sampling-based iterative algorithms. We compare the performance of a widely-used reactive method ORCA with three variants of a popular planning algorithm RRT* applied to multi-agent path planning and find that an algorithm combining reactive collision avoidance and RRT* planning, which we call ORCA-RRT* can be used to solve instances that are out of the reach of either of the techniques. We experimentally show that: 1) the reactive part of the algorithm can efficiently solve many multi-agent path finding problems involving large number of agents, for which RRT* algorithm is often unable to find a solution in limited time and 2) the planning component of the algorithm is able to solve many instances containing local minima, where reactive techniques typically fail.
[ { "created": "Fri, 14 Feb 2014 22:09:44 GMT", "version": "v1" } ]
2014-02-18
[ [ "Janovský", "Pavel", "" ], [ "Čáp", "Michal", "" ], [ "Vokřínek", "Jiří", "" ] ]
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1402.3626
Mark Wilde
Mark M. Wilde and Andreas Winter
Strong converse for the quantum capacity of the erasure channel for almost all codes
15 pages, submission to the 9th Conference on the Theory of Quantum Computation, Communication, and Cryptography (TQC 2014)
Proceedings of the 9th Conference on the Theory of Quantum Computation, Communication and Cryptography, LIPIcs vol. 27, pages 52-66, May 2014
10.4230/LIPIcs.TQC.2014.52
null
quant-ph cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A strong converse theorem for channel capacity establishes that the error probability in any communication scheme for a given channel necessarily tends to one if the rate of communication exceeds the channel's capacity. Establishing such a theorem for the quantum capacity of degradable channels has been an elusive task, with the strongest progress so far being a so-called "pretty strong converse". In this work, Morgan and Winter proved that the quantum error of any quantum communication scheme for a given degradable channel converges to a value larger than $1/\sqrt{2}$ in the limit of many channel uses if the quantum rate of communication exceeds the channel's quantum capacity. The present paper establishes a theorem that is a counterpart to this "pretty strong converse". We prove that the large fraction of codes having a rate exceeding the erasure channel's quantum capacity have a quantum error tending to one in the limit of many channel uses. Thus, our work adds to the body of evidence that a fully strong converse theorem should hold for the quantum capacity of the erasure channel. As a side result, we prove that the classical capacity of the quantum erasure channel obeys the strong converse property.
[ { "created": "Fri, 14 Feb 2014 23:57:53 GMT", "version": "v1" } ]
2014-12-15
[ [ "Wilde", "Mark M.", "" ], [ "Winter", "Andreas", "" ] ]
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1402.3631
Justin Hsu
Justin Hsu and Aaron Roth and Tim Roughgarden and Jonathan Ullman
Privately Solving Linear Programs
null
null
10.1007/978-3-662-43948-7_51
null
cs.DS cs.CR cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we initiate the systematic study of solving linear programs under differential privacy. The first step is simply to define the problem: to this end, we introduce several natural classes of private linear programs that capture different ways sensitive data can be incorporated into a linear program. For each class of linear programs we give an efficient, differentially private solver based on the multiplicative weights framework, or we give an impossibility result.
[ { "created": "Sat, 15 Feb 2014 00:55:46 GMT", "version": "v1" }, { "created": "Thu, 8 May 2014 19:52:34 GMT", "version": "v2" } ]
2018-03-16
[ [ "Hsu", "Justin", "" ], [ "Roth", "Aaron", "" ], [ "Roughgarden", "Tim", "" ], [ "Ullman", "Jonathan", "" ] ]
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1402.3634
Vaibhav Srivastava
Vaibhav Srivastava and Naomi Ehrich Leonard
Collective Decision-Making in Ideal Networks: The Speed-Accuracy Tradeoff
to appear in IEEE TCNS
null
null
null
math.OC cs.MA cs.SY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study collective decision-making in a model of human groups, with network interactions, performing two alternative choice tasks. We focus on the speed-accuracy tradeoff, i.e., the tradeoff between a quick decision and a reliable decision, for individuals in the network. We model the evidence aggregation process across the network using a coupled drift diffusion model (DDM) and consider the free response paradigm in which individuals take their time to make the decision. We develop reduced DDMs as decoupled approximations to the coupled DDM and characterize their efficiency. We determine high probability bounds on the error rate and the expected decision time for the reduced DDM. We show the effect of the decision-maker's location in the network on their decision-making performance under several threshold selection criteria. Finally, we extend the coupled DDM to the coupled Ornstein-Uhlenbeck model for decision-making in two alternative choice tasks with recency effects, and to the coupled race model for decision-making in multiple alternative choice tasks.
[ { "created": "Sat, 15 Feb 2014 01:47:42 GMT", "version": "v1" } ]
2014-02-18
[ [ "Srivastava", "Vaibhav", "" ], [ "Leonard", "Naomi Ehrich", "" ] ]
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1402.3643
Shayan Oveis Gharan
Mohammad Akbarpour and Shengwu Li and Shayan Oveis Gharan
Dynamic Matching Market Design
null
null
null
null
cs.GT cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We introduce a simple benchmark model of dynamic matching in networked markets, where agents arrive and depart stochastically and the network of acceptable transactions among agents forms a random graph. We analyze our model from three perspectives: waiting, optimization, and information. The main insight of our analysis is that waiting to thicken the market can be substantially more important than increasing the speed of transactions, and this is quite robust to the presence of waiting costs. From an optimization perspective, naive local algorithms, that choose the right time to match agents but do not exploit global network structure, can perform very close to optimal algorithms. From an information perspective, algorithms that employ even partial information on agents' departure times perform substantially better than those that lack such information. To elicit agents' departure times, we design an incentive-compatible continuous-time dynamic mechanism without transfers.
[ { "created": "Sat, 15 Feb 2014 04:30:41 GMT", "version": "v1" } ]
2014-02-18
[ [ "Akbarpour", "Mohammad", "" ], [ "Li", "Shengwu", "" ], [ "Gharan", "Shayan Oveis", "" ] ]
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1402.3648
Shikha Kabra
Shikha Kabra, Ritika Agarwal
Auto Spell Suggestion for High Quality Speech Synthesis in Hindi
4 pages, 5 figures. International Journal of Computer Applications, 2014
null
10.5120/15302-4039
null
cs.CL cs.SD
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The goal of Text-to-Speech (TTS) synthesis in a particular language is to convert arbitrary input text to intelligible and natural sounding speech. However, for a particular language like Hindi, which is a highly confusing language (due to very close spellings), it is not an easy task to identify errors/mistakes in input text and an incorrect text degrade the quality of output speech hence this paper is a contribution to the development of high quality speech synthesis with the involvement of Spellchecker which generates spell suggestions for misspelled words automatically. Involvement of spellchecker would increase the efficiency of speech synthesis by providing spell suggestions for incorrect input text. Furthermore, we have provided the comparative study for evaluating the resultant effect on to phonetic text by adding spellchecker on to input text.
[ { "created": "Sat, 15 Feb 2014 05:11:35 GMT", "version": "v1" } ]
2014-02-19
[ [ "Kabra", "Shikha", "" ], [ "Agarwal", "Ritika", "" ] ]
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1402.3651
Bhavikkumar Patel
Bhavikkumar Patel, Dhrumil Shah
Evaluating ECG Capturing Using Sound-Card of PC/Laptop
22 Pages
null
null
null
cs.OH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The purpose of the Evaluating ECG capturing using sound-card of PC/Laptop is provided portable and low cost ECG monitoring system using laptop and mobile phones. There is no need to interface micro controller or any other device to transmit ECG data. This research is based on hardware design, implementation, signal capturing and Evaluation of an ECG processing and analyzing system which attend the physicians in heart disease diagnosis. Some important modification is given in design part to avoid all definitive ECG instrument problems faced in previous designs. Moreover, attenuate power frequency noise and noise that produces from patient's body have required additional developments. The hardware design has basically three units: transduction and conditioning Unit, interfacing unit and data processing unit.The most focusing factor is the ECG signal/data transmits in laptop/PC via microphone pin. The live simulation is possible using SOUNDSCOPE software in PC/Laptop. The software program that is written in MATLAB and LAB-View performs data acquisition (record, stored, filtration) and several tasks such as QRS detection, calculate heart rate.
[ { "created": "Sat, 15 Feb 2014 05:25:56 GMT", "version": "v1" } ]
2014-02-18
[ [ "Patel", "Bhavikkumar", "" ], [ "Shah", "Dhrumil", "" ] ]
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1402.3653
Aaron Becker
Aaron Becker and Chris Ertel and James McLurkin
Crowdsourcing Swarm Manipulation Experiments: A Massive Online User Study with Large Swarms of Simple Robots
8 pages, 13 figures, to appear at 2014 IEEE International Conference on Robotics and Automation (ICRA 2014)
null
null
null
cs.RO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Micro- and nanorobotics have the potential to revolutionize many applications including targeted material delivery, assembly, and surgery. The same properties that promise breakthrough solutions---small size and large populations---present unique challenges to generating controlled motion. We want to use large swarms of robots to perform manipulation tasks; unfortunately, human-swarm interaction studies as conducted today are limited in sample size, are difficult to reproduce, and are prone to hardware failures. We present an alternative. This paper examines the perils, pitfalls, and possibilities we discovered by launching SwarmControl.net, an online game where players steer swarms of up to 500 robots to complete manipulation challenges. We record statistics from thousands of players, and use the game to explore aspects of large-population robot control. We present the game framework as a new, open-source tool for large-scale user experiments. Our results have potential applications in human control of micro- and nanorobots, supply insight for automatic controllers, and provide a template for large online robotic research experiments.
[ { "created": "Sat, 15 Feb 2014 06:03:28 GMT", "version": "v1" } ]
2014-02-18
[ [ "Becker", "Aaron", "" ], [ "Ertel", "Chris", "" ], [ "McLurkin", "James", "" ] ]
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1402.3654
Dhrumil Shah
Piyush Singhala, Dhrumil Shah, Bhavikkumar Patel
Temperature Control using Fuzzy Logic
10 pages
null
null
null
cs.SY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The aim of the temperature control is to heat the system up todelimitated temperature, afterwardhold it at that temperature in insured manner. Fuzzy Logic Controller (FLC) is best way in which this type of precision control can be accomplished by controller. During past twenty yearssignificant amount of research using fuzzy logichas done in this field of control of non-linear dynamical system. Here we have developed temperature control system using fuzzy logic. Control theory techniques are the root from which convention controllers are deducted. The desired response of the output can be guaranteed by the feedback controller.
[ { "created": "Sat, 15 Feb 2014 06:25:09 GMT", "version": "v1" } ]
2014-02-18
[ [ "Singhala", "Piyush", "" ], [ "Shah", "Dhrumil", "" ], [ "Patel", "Bhavikkumar", "" ] ]
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1402.3655
V Karthikeyan VKK
V. Karthikeyan, A. Vinod, P. Jeyakumar
An Energy Efficient Neighbour Node Discovery Method for Wireless Sensor Networks
4 figures and 5 pages
null
null
null
cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The discovery of neighbouring nodes in multihop wireless networks has become a key challenge. Due to tribulations in communication, synchronization loss between nodes, disparity in transmission power etc, the connectivity of nodes will always experience disruptions. On the other hand, the energy utilization by the nodes also became critical . In this paper, we propose a new method for neighbour discovery in wireless sensor networks (WSNs) which pays an eminent consideration for energy utilization and QoS parameters like latency, throughput, error rate etc. In the proposed method, the network routing is enhanced using AOMDV protocol which can accurately discover the neighbour nodes and power management with HMAC protocol which reduces the energy utilization significantly. A complete analysis is being performed to estimate how the Q o S metrics varies in various scenarios of power consumption in wireless networks.
[ { "created": "Sat, 15 Feb 2014 06:33:50 GMT", "version": "v1" } ]
2014-02-18
[ [ "Karthikeyan", "V.", "" ], [ "Vinod", "A.", "" ], [ "Jeyakumar", "P.", "" ] ]
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1402.3656
V Karthikeyan VKK
V. Karthikeyan, V.J. Vijayalakshmi
Analysis of Carrier Frequency Selective Offset Estimation - Using Zero-IF and ZCZIn MC-DS-CDMA
5 pages and 6 figures
null
null
null
cs.NI cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A new method for frequency synchronization based upon Zero-Intermediate Frequency Zero-IF receiver and characteristics of the received signal s power spectrum for MC-DSCDMA Up link system is proposed in this paper. In addition to this, employing Zero Correlation Zone (ZCZ) sequences, designed specifically for quasi synchronous up link transmissions, is proposed to exploit frequency and temporal diversity in frequency-selective block fading channels. The variance for Carrier Frequency Offset (CFO) estimators of MC DS CDMA Uplink is compared with that of an OFDM system to estimate the CFO. Our study and results show that the MC DS CDMA system is outperforming the OFDM method
[ { "created": "Sat, 15 Feb 2014 06:44:30 GMT", "version": "v1" } ]
2014-02-18
[ [ "Karthikeyan", "V.", "" ], [ "Vijayalakshmi", "V. J.", "" ] ]
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1402.3657
V Karthikeyan VKK
V. Karthikeyan, B. Praveen Kumar, S. Suresh Babu, R. Purusothaman, shijin Thomas
A Narrative Vehicle Protection Representation for Vehicle Speed Regulator Under Driver Exhaustion -- A Study
4 pages 6 figures
null
null
null
cs.CV cs.HC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Driver fatigue is one of the important factors that cause traffic accidents, and the ever-increasing number due to diminished drivers vigilance level has become a problem of serious concern to society. Drivers with a diminished vigilance level suffer from a marked decline in their abilities of perception, recognition, and vehicle control, and therefore pose serious danger to their own life and the lives of other people. Exhaustion resulting from sleep deprivation or sleep disorders is an important factor in the creasing number of accidents. In this projected work, we discuss the various methods of the existing and the proposed method based on a real time online safety prototype that controls the vehicle speed under driver fatigue. The purpose of such a model is to advance a system to detect fatigue symptoms in drivers and control the speed of vehicle to avoid accidents. This system was tested adequately with subjects of different technology of various researchers finally the validity of the proposed model for vehicle speed controller based on driver fatigue detection is shown.
[ { "created": "Sat, 15 Feb 2014 06:51:00 GMT", "version": "v1" } ]
2014-02-18
[ [ "Karthikeyan", "V.", "" ], [ "Kumar", "B. Praveen", "" ], [ "Babu", "S. Suresh", "" ], [ "Purusothaman", "R.", "" ], [ "Thomas", "shijin", "" ] ]
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1402.3661
Hamza Jeljeli
Hamza Jeljeli (INRIA Nancy - Grand Est / LORIA)
Resolution of Linear Algebra for the Discrete Logarithm Problem Using GPU and Multi-core Architectures
Euro-Par 2014 Parallel Processing, Aug 2014, Porto, Portugal. \<http://europar2014.dcc.fc.up.pt/\>
null
null
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cs.CR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In cryptanalysis, solving the discrete logarithm problem (DLP) is key to assessing the security of many public-key cryptosystems. The index-calculus methods, that attack the DLP in multiplicative subgroups of finite fields, require solving large sparse systems of linear equations modulo large primes. This article deals with how we can run this computation on GPU- and multi-core-based clusters, featuring InfiniBand networking. More specifically, we present the sparse linear algebra algorithms that are proposed in the literature, in particular the block Wiedemann algorithm. We discuss the parallelization of the central matrix--vector product operation from both algorithmic and practical points of view, and illustrate how our approach has contributed to the recent record-sized DLP computation in GF($2^{809}$).
[ { "created": "Sat, 15 Feb 2014 07:10:15 GMT", "version": "v1" }, { "created": "Thu, 4 Dec 2014 19:28:20 GMT", "version": "v2" } ]
2014-12-05
[ [ "Jeljeli", "Hamza", "", "INRIA Nancy - Grand Est / LORIA" ] ]
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1402.3664
Xinyang Deng
Xinyang Deng, Yong Hu, Felix Chan, Sankaran Mahadevan, Yong Deng
Parameter estimation based on interval-valued belief structures
10 pages
null
null
null
cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Parameter estimation based on uncertain data represented as belief structures is one of the latest problems in the Dempster-Shafer theory. In this paper, a novel method is proposed for the parameter estimation in the case where belief structures are uncertain and represented as interval-valued belief structures. Within our proposed method, the maximization of likelihood criterion and minimization of estimated parameter's uncertainty are taken into consideration simultaneously. As an illustration, the proposed method is employed to estimate parameters for deterministic and uncertain belief structures, which demonstrates its effectiveness and versatility.
[ { "created": "Sat, 15 Feb 2014 08:07:49 GMT", "version": "v1" } ]
2014-02-18
[ [ "Deng", "Xinyang", "" ], [ "Hu", "Yong", "" ], [ "Chan", "Felix", "" ], [ "Mahadevan", "Sankaran", "" ], [ "Deng", "Yong", "" ] ]
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1402.3668
Robert Granger
Robert Granger and Thorsten Kleinjung and Jens Zumbr\"agel
Breaking `128-bit Secure' Supersingular Binary Curves (or how to solve discrete logarithms in ${\mathbb F}_{2^{4 \cdot 1223}}$ and ${\mathbb F}_{2^{12 \cdot 367}}$)
18 pages, 1 figure
null
null
null
math.NT cs.CR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In late 2012 and early 2013 the discrete logarithm problem (DLP) in finite fields of small characteristic underwent a dramatic series of breakthroughs, culminating in a heuristic quasi-polynomial time algorithm, due to Barbulescu, Gaudry, Joux and Thom\'e. Using these developments, Adj, Menezes, Oliveira and Rodr\'iguez-Henr\'iquez analysed the concrete security of the DLP, as it arises from pairings on (the Jacobians of) various genus one and two supersingular curves in the literature, which were originally thought to be $128$-bit secure. In particular, they suggested that the new algorithms have no impact on the security of a genus one curve over ${\mathbb F}_{2^{1223}}$, and reduce the security of a genus two curve over ${\mathbb F}_{2^{367}}$ to $94.6$ bits. In this paper we propose a new field representation and efficient general descent principles which together make the new techniques far more practical. Indeed, at the `128-bit security level' our analysis shows that the aforementioned genus one curve has approximately $59$ bits of security, and we report a total break of the genus two curve.
[ { "created": "Sat, 15 Feb 2014 09:31:36 GMT", "version": "v1" }, { "created": "Tue, 18 Feb 2014 07:48:46 GMT", "version": "v2" }, { "created": "Thu, 12 Jun 2014 11:46:41 GMT", "version": "v3" } ]
2014-06-13
[ [ "Granger", "Robert", "" ], [ "Kleinjung", "Thorsten", "" ], [ "Zumbrägel", "Jens", "" ] ]
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1402.3672
Shu-chen Liu
Shu-chen Liu, Stefanos Marnieros, Louis Dumoulin, Youri Dolgorouki, Laurent Berge, and Sophie Collin
Electron-Phonon Coupling on the NbSi Transition Edge Sensors
24 pages, 12 figures, manuscript prepared in 2009
null
null
null
astro-ph.IM cond-mat.supr-con physics.ins-det
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We have built an electron-phonon coupling model to describe the behavior of the NbxSi1-x transition edge sensor (TES) bolometers, fabricated by electron-beam coevaporation and photolithography techniques on a 2-inch silicon wafer. The resistance versus temperature curves of several sensors with different thickness are measured with different bias currents, ranging from 200 nA to 10 micro A, and the electron-phonon coupling coefficient and the electron-phonon thermal conductance are calculated herein. Our values are quite comparable with those in metallic TES samples of other groups using different measurement methods, while we are using the transition region of our TES sample to calculate the electron-phonon coupling interaction.
[ { "created": "Sat, 15 Feb 2014 10:39:09 GMT", "version": "v1" } ]
2014-02-18
[ [ "Liu", "Shu-chen", "" ], [ "Marnieros", "Stefanos", "" ], [ "Dumoulin", "Louis", "" ], [ "Dolgorouki", "Youri", "" ], [ "Berge", "Laurent", "" ], [ "Collin", "Sophie", "" ] ]
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1402.3679
Thomas Gastine
T. Gastine, M. Heimpel, J. Wicht
Zonal flow scaling in rapidly-rotating compressible convection
17 pages, 12 figures, 3 tables, accepted for publication in PEPI
null
10.1016/j.pepi.2014.03.011
null
astro-ph.EP physics.flu-dyn physics.geo-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The surface winds of Jupiter and Saturn are primarily zonal. Each planet exhibits strong prograde equatorial flow flanked by multiple alternating zonal winds at higher latitudes. The depth to which these flows penetrate has long been debated and is still an unsolved problem. Previous rotating convection models that obtained multiple high latitude zonal jets comparable to those on the giant planets assumed an incompressible (Boussinesq) fluid, which is unrealistic for gas giant planets. Later models of compressible rotating convection obtained only few high latitude jets which were not amenable to scaling analysis. Here we present 3-D numerical simulations of compressible convection in rapidly-rotating spherical shells. To explore the formation and scaling of high-latitude zonal jets, we consider models with a strong radial density variation and a range of Ekman numbers, while maintaining a zonal flow Rossby number characteristic of Saturn. All of our simulations show a strong prograde equatorial jet outside the tangent cylinder. At low Ekman numbers several alternating jets form in each hemisphere inside the tangent cylinder. To analyse jet scaling of our numerical models and of Jupiter and Saturn, we extend Rhines scaling based on a topographic $\beta$-parameter, which was previously applied to an incompressible fluid in a spherical shell, to compressible fluids. The jet-widths predicted by this modified Rhines length are found to be in relatively good agreement with our numerical model results and with cloud tracking observations of Jupiter and Saturn.
[ { "created": "Sat, 15 Feb 2014 12:04:46 GMT", "version": "v1" }, { "created": "Wed, 26 Mar 2014 11:08:26 GMT", "version": "v2" } ]
2015-06-18
[ [ "Gastine", "T.", "" ], [ "Heimpel", "M.", "" ], [ "Wicht", "J.", "" ] ]
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1402.3681
Morteza Shahpari
Morteza Shahpari and David V. Thiel and Andrew Lewis
Polarizablity of 2D and 3D conducting objects using method of moments
Peer-reviewed article
ANZIAM Journal, 54 (2012): C446-C458
null
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Fundamental antenna limits of the gain-bandwidth product are derived from polarizability calculations. This electrostatic technique has significant value in many antenna evaluations. Polarizability is not available in closed form for most antenna shapes and no commercial electromagnetic packages have this facility. Numerical computation of the polarizability for arbitrary conducting bodies was undertaken using an unstructured triangular mesh over the surface of 2D and 3D objects. Numerical results compare favourably with analytical solutions and can be implemented efficiently for large structures of arbitrary shape.
[ { "created": "Sat, 15 Feb 2014 12:12:14 GMT", "version": "v1" } ]
2014-02-18
[ [ "Shahpari", "Morteza", "" ], [ "Thiel", "David V.", "" ], [ "Lewis", "Andrew", "" ] ]
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1402.3689
Radu Horaud P
Maxime Janvier, Xavier Alameda-Pineda, Laurent Girin and Radu Horaud
Sound Representation and Classification Benchmark for Domestic Robots
8 pages, 2 figures
null
null
null
cs.SD cs.RO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We address the problem of sound representation and classification and present results of a comparative study in the context of a domestic robotic scenario. A dataset of sounds was recorded in realistic conditions (background noise, presence of several sound sources, reverberations, etc.) using the humanoid robot NAO. An extended benchmark is carried out to test a variety of representations combined with several classifiers. We provide results obtained with the annotated dataset and we assess the methods quantitatively on the basis of their classification scores, computation times and memory requirements. The annotated dataset is publicly available at https://team.inria.fr/perception/nard/.
[ { "created": "Sat, 15 Feb 2014 13:27:01 GMT", "version": "v1" } ]
2014-02-18
[ [ "Janvier", "Maxime", "" ], [ "Alameda-Pineda", "Xavier", "" ], [ "Girin", "Laurent", "" ], [ "Horaud", "Radu", "" ] ]
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1402.3690
Jonathan Heras
J\'onathan Heras and Ekaterina Komendantskaya and Martin Schmidt
(Co)recursion in Logic Programming: Lazy vs Eager
To appear in Theory and Practice of Logic Programming (TPLP)
null
null
null
cs.PL cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
CoAlgebraic Logic Programming (CoALP) is a dialect of Logic Programming designed to bring a more precise compile-time and run-time analysis of termination and productivity for recursive and corecursive functions in Logic Programming. Its second goal is to introduce guarded lazy (co)recursion akin to functional theorem provers into logic programming. In this paper, we explain lazy features of CoALP, and compare them with the loop-analysis and eager execution in Coinductive Logic Programming (CoLP). We conclude by outlining the future directions in developing the guarded (co)recursion in logic programming.
[ { "created": "Sat, 15 Feb 2014 13:28:34 GMT", "version": "v1" }, { "created": "Thu, 15 May 2014 21:25:25 GMT", "version": "v2" }, { "created": "Mon, 19 May 2014 08:07:40 GMT", "version": "v3" }, { "created": "Tue, 20 May 2014 07:46:48 GMT", "version": "v4" } ]
2014-05-21
[ [ "Heras", "Jónathan", "" ], [ "Komendantskaya", "Ekaterina", "" ], [ "Schmidt", "Martin", "" ] ]
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1402.3691
Benjamin Hendrik Martin Ludwig
Hendrik Ludwig and Remo Ruffini
Gamow's Calculation of the Neutron Star's Critical Mass Revised
null
null
10.3938/jkps.65.892
null
astro-ph.SR gr-qc physics.hist-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
It has at times been indicated that Landau introduced neutron stars in his classic paper of 1932. This is clearly impossible because the discovery of the neutron by Chadwick was submitted more than one month after Landau's work. Therefore, and according to his calculations, what Landau really did was to study white dwarfs, and the critical mass he obtained clearly matched the value derived by Stoner and later by Chandrasekhar. The birth of the concept of a neutron star is still today unclear. Clearly, in 1934, the work of Baade and Zwicky pointed to neutron stars as originating from supernovae. Oppenheimer in 1939 is also well known to have introduced general relativity (GR) in the study of neutron stars. The aim of this note is to point out that the crucial idea for treating the neutron star has been advanced in Newtonian theory by Gamow. However, this pioneering work was plagued by mistakes. The critical mass he should have obtained was $6.9\,M_\odot$, not the one he declared, namely, $1.5\ M_\odot$. Probably, he was taken to this result by the work of Landau on white dwarfs. We revise Gamow's calculation of the critical mass regarding calculational and conceptual aspects and discuss whether it is justified to consider it the first neutron-star critical mass. We compare Gamow's approach to other early and modern approaches to the problem.
[ { "created": "Sat, 15 Feb 2014 13:35:07 GMT", "version": "v1" }, { "created": "Wed, 21 May 2014 19:31:46 GMT", "version": "v2" }, { "created": "Fri, 5 Sep 2014 19:31:34 GMT", "version": "v3" } ]
2015-06-18
[ [ "Ludwig", "Hendrik", "" ], [ "Ruffini", "Remo", "" ] ]
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1402.3694
Andrey Kupavskii
Andrey B. Kupavskii, Alexandr Polyanskii
Proof of Schur's conjecture in $\mathbb R^d$
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null
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math.MG cs.DM math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we prove Schur's conjecture in $\mathbb R^d$, which states that any diameter graph $G$ in the Euclidean space $\mathbb R^d$ on $n$ vertices may have at most $n$ cliques of size $d$. We obtain an analogous statement for diameter graphs with unit edge length on a sphere $S^d_r$ of radius $r>1/\sqrt 2$. The proof rests on the following statement, conjectured by F. Mori\'c and J. Pach: given two unit regular simplices $\Delta_1,\Delta_2$ on $d$ vertices in $\mathbb R^d$, either they share $d-2$ vertices, or there are vertices $v_1\in \Delta_1,v_2\in \Delta_2$ such that $\|v_1-v_2\|>1$. The same holds for unit simplices on a $d$-dimensional sphere of radius greater than $1/\sqrt 2$.
[ { "created": "Sat, 15 Feb 2014 14:19:27 GMT", "version": "v1" }, { "created": "Sun, 5 Jul 2015 14:10:25 GMT", "version": "v2" }, { "created": "Sat, 18 Jul 2015 17:36:15 GMT", "version": "v3" }, { "created": "Thu, 3 Mar 2016 00:12:46 GMT", "version": "v4" } ]
2017-12-01
[ [ "Kupavskii", "Andrey B.", "" ], [ "Polyanskii", "Alexandr", "" ] ]
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1402.3696
Nicolas Broutin
Nicolas Broutin, Luc Devroye and G\'abor Lugosi
Connectivity of sparse Bluetooth networks
null
null
null
null
math.PR cs.DM cs.NI math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Consider a random geometric graph defined on $n$ vertices uniformly distributed in the $d$-dimensional unit torus. Two vertices are connected if their distance is less than a "visibility radius" $r_n$. We consider {\sl Bluetooth networks} that are locally sparsified random geometric graphs. Each vertex selects $c$ of its neighbors in the random geometric graph at random and connects only to the selected points. We show that if the visibility radius is at least of the order of $n^{-(1-\delta)/d}$ for some $\delta > 0$, then a constant value of $c$ is sufficient for the graph to be connected, with high probability. It suffices to take $c \ge \sqrt{(1+\epsilon)/\delta} + K$ for any positive $\epsilon$ where $K$ is a constant depending on $d$ only. On the other hand, with $c\le \sqrt{(1-\epsilon)/\delta}$, the graph is disconnected, with high probability.
[ { "created": "Sat, 15 Feb 2014 14:27:12 GMT", "version": "v1" } ]
2014-02-18
[ [ "Broutin", "Nicolas", "" ], [ "Devroye", "Luc", "" ], [ "Lugosi", "Gábor", "" ] ]
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1402.3698
Iddo Bentov
Adam Back and Iddo Bentov
Note on fair coin toss via Bitcoin
See also https://bitcointalk.org/index.php?topic=277048.0
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cs.CR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this short note we show that the Bitcoin network can allow remote parties to gamble with their bitcoins by tossing a fair or biased coin, with no need for a trusted party, and without the possibility of extortion by dishonest parties who try to abort. The superfluousness of having a trusted party implies that there is no house edge, as is the case with centralized services that are supposed to generate a profit.
[ { "created": "Sat, 15 Feb 2014 15:10:32 GMT", "version": "v1" } ]
2014-02-18
[ [ "Back", "Adam", "" ], [ "Bentov", "Iddo", "" ] ]
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1402.3704
Bo Gao
Ming Li and Li You and Bo Gao
Multichannel quantum-defect theory for ion-atom interactions
5 pages, 3 figures
null
10.1103/PhysRevA.89.052704
null
physics.atom-ph physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a quantum theory of ion-atom interaction that is applicable at energies comparable to or smaller than the atomic hyperfine splitting and takes proper account of the effects of identical nuclei. The theory reveals the subtlety and the complexity of cold ion-atom interactions including the change of threshold behavior due to hyperfine splitting and the existence of a large number, and a variety of scattering resonances between hyperfine thresholds. We show how this complexity is described, efficiently and at a quantitative level, using a multichannel quantum-defect theory that we present here for ion-atom interactions. Such an efficient description is a key enabling element to understand few-body and many-body quantum systems involving ions.
[ { "created": "Sat, 15 Feb 2014 16:48:01 GMT", "version": "v1" } ]
2015-06-18
[ [ "Li", "Ming", "" ], [ "You", "Li", "" ], [ "Gao", "Bo", "" ] ]
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1402.3715
Morag Casey Dr
Morag M. Casey
Supporting Level 1 Physics & Astronomy Undergraduates at the University of Glasgow
arXiv admin note: text overlap with arXiv:0911.2733
GIREP-EPEC Conference Proceedings: Frontiers of Physics Education (2007, Opatjia, Croatia: Sveucilisna Knjiznica Rijeka, ISBN: 978-953-55066-1-4, p~283.)
null
null
physics.ed-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
It is generally accepted that the retention and associated completion rates for first year classes are an area of concern for UK universities, and physics and astronomy classes at the University of Glasgow are exception. Classes are often large and, as result, student integration on academic and social levels can be difficult to achieve; some students perceive a lack of personal interest and support in what can be a stressful transition from secondary to tertiary education. In order to address these issues, the author has been employed in a new departmental post, Director of Learning Support for First Year. The remit of this post is primarily the implementation of an improved personal contact and academic monitoring and support strategy for first year undergraduates. The purpose of this paper is to present the ways in which it is hoped that the role of Director of Learning Support will positively impact on aspects of the forthcoming academic year.
[ { "created": "Sat, 15 Feb 2014 19:34:13 GMT", "version": "v1" } ]
2014-02-18
[ [ "Casey", "Morag M.", "" ] ]
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null
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1402.3717
Rashid Zia
Dongfang Li, Mingming Jiang, S\'ebastien Cueff, Christopher M. Dodson, Sinan Karaveli, Rashid Zia
Quantifying and controlling the magnetic dipole contribution to 1.5 $\mu$m light emission in erbium-doped yttrium oxide
5 page manuscript including 3 figures; 2 page ancillary supplement including 2 figures
null
10.1103/PhysRevB.89.161409
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We experimentally quantify the contribution of magnetic dipole (MD) transitions to the near-infrared light emission from trivalent erbium-doped yttrium oxide (Er$^{3+}$:Y$_2$O$_3$). Using energy-momentum spectroscopy, we demonstrate that the $^4$I$_{13/2}{\to}^4$I$_{15/2}$ emission near 1.5 $\mu$m originates from nearly equal contributions of electric dipole (ED) and MD transitions that exhibit distinct emission spectra. We then show how these distinct spectra, together with the differing local density of optical states (LDOS) for ED and MD transitions, can be leveraged to control Er$^{3+}$ emission in structured environments. We demonstrate that far-field emission spectra can be tuned to resemble almost pure emission from either ED or MD transitions, and show that the observed spectral modifications can be accurately predicted from the measured ED and MD intrinsic emission rates.
[ { "created": "Sat, 15 Feb 2014 19:57:03 GMT", "version": "v1" } ]
2015-06-18
[ [ "Li", "Dongfang", "" ], [ "Jiang", "Mingming", "" ], [ "Cueff", "Sébastien", "" ], [ "Dodson", "Christopher M.", "" ], [ "Karaveli", "Sinan", "" ], [ "Zia", "Rashid", "" ] ]
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1402.3718
Ying Long
Ying Long, Kang Wu, Qizhi Mao
Simulating urban expansion in the parcel level for all Chinese cities
23 pages, 8 figures
null
null
null
cs.MA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Large-scale models are generally associated with big modelling units in space, like counties or super grids (several to dozens km2). Few applied urban models can pursue large-scale extent with fine-level units simultaneously due to data availability and computation load. The framework of automatic identification and characterization parcels developed by Long and Liu (2013) makes such an ideal model possible by establishing existing urban parcels using road networks and points of interest for a super large area (like a country or a continent). In this study, a mega-vector-parcels cellular automata model (MVP-CA) is developed for simulating urban expansion in the parcel level for all 654 Chinese cities. Existing urban parcels in 2012, for initiating MVP-CA, are generated using multi-levelled road networks and ubiquitous points of interest, followed by simulating parcel-based urban expansion of all cities during 2012-2017. Reflecting national spatial development strategies discussed extensively by academics and decision makers, the baseline scenario and other two simulated urban expansion scenarios have been tested and compared horizontally. As the first fine-scale urban expansion model from the national scope, its academic contributions, practical applications, and potential biases are discussed in this paper as well.
[ { "created": "Sat, 15 Feb 2014 19:57:07 GMT", "version": "v1" } ]
2014-02-18
[ [ "Long", "Ying", "" ], [ "Wu", "Kang", "" ], [ "Mao", "Qizhi", "" ] ]
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1402.3722
Yoav Goldberg
Yoav Goldberg and Omer Levy
word2vec Explained: deriving Mikolov et al.'s negative-sampling word-embedding method
null
null
null
null
cs.CL cs.LG stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The word2vec software of Tomas Mikolov and colleagues (https://code.google.com/p/word2vec/ ) has gained a lot of traction lately, and provides state-of-the-art word embeddings. The learning models behind the software are described in two research papers. We found the description of the models in these papers to be somewhat cryptic and hard to follow. While the motivations and presentation may be obvious to the neural-networks language-modeling crowd, we had to struggle quite a bit to figure out the rationale behind the equations. This note is an attempt to explain equation (4) (negative sampling) in "Distributed Representations of Words and Phrases and their Compositionality" by Tomas Mikolov, Ilya Sutskever, Kai Chen, Greg Corrado and Jeffrey Dean.
[ { "created": "Sat, 15 Feb 2014 21:03:02 GMT", "version": "v1" } ]
2014-02-18
[ [ "Goldberg", "Yoav", "" ], [ "Levy", "Omer", "" ] ]
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word2vec Explained: deriving Mikolov et al.'s negative-sampling word-embedding method
http://arxiv.org/abs/1402.3722v1
http://arxiv.org/pdf/1402.3722v1.pdf
https://github.com/MLBurnham/word_embeddings
false
false
https://paperswithcode.com/paper/word2vec-explained-deriving-mikolov-et-als
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1402.3727
Jaehyun Park
Jaehyun Park and Bruno Clerckx
Multi-user Linear Precoding for Multi-polarized Massive MIMO System under Imperfect CSIT
accepted to IEEE Transactions on Wireless Communications
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The space limitation and the channel acquisition prevent Massive MIMO from being easily deployed in a practical setup. Motivated by current deployments of LTE-Advanced, the use of multi-polarized antennas can be an efficient solution to address the space constraint. Furthermore, the dual-structured precoding, in which a preprocessing based on the spatial correlation and a subsequent linear precoding based on the short-term channel state information at the transmitter (CSIT) are concatenated, can reduce the feedback overhead efficiently. By grouping and preprocessing spatially correlated mobile stations (MSs), the dimension of the precoding signal space is reduced and the corresponding short-term CSIT dimension is reduced. In this paper, to reduce the feedback overhead further, we propose a dual-structured multi-user linear precoding, in which the subgrouping method based on co-polarization is additionally applied to the spatially grouped MSs in the preprocessing stage. Furthermore, under imperfect CSIT, the proposed scheme is asymptotically analyzed based on random matrix theory. By investigating the behavior of the asymptotic performance, we also propose a new dual-structured precoding in which the precoding mode is switched between two dual-structured precoding strategies with 1) the preprocessing based only on the spatial correlation and 2) the preprocessing based on both the spatial correlation and polarization. Finally, we extend it to 3D dual-structured precoding.
[ { "created": "Sat, 15 Feb 2014 22:12:03 GMT", "version": "v1" }, { "created": "Mon, 12 Jan 2015 05:09:44 GMT", "version": "v2" } ]
2015-01-13
[ [ "Park", "Jaehyun", "" ], [ "Clerckx", "Bruno", "" ] ]
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1402.3731
Matthew Szydagis
M. Szydagis, D.S. Akerib, H.M. Araujo, X. Bai, A.J. Bailey, J. Balajthy, E. Bernard, A. Bernstein, A. Bradley, D. Byram, S.B. Cahn, M.C. Carmona-Benitez, C. Chan, J.J. Chapman, A.A. Chiller, C. Chiller, T. Coffey, A. Currie, L. de Viveiros, A. Dobi, J. Dobson, E. Druszkiewicz, B. Edwards, C.H. Faham, S. Fiorucci, C. Flores, R.J. Gaitskell, V.M. Gehman, C. Ghag, K.R. Gibson, M.G.D. Gilchriese, C. Hall, S.A. Hertel, M. Horn, D.Q. Huang, M. Ihm, R.G. Jacobsen, K. Kazkaz, R. Knoche, N.A. Larsen, C. Lee, A. Lindote, M.I. Lopes, D.C. Malling, R. Mannino, D.N. McKinsey, D.-M. Mei, J. Mock, M. Moongweluwan, J. Morad, A.St.J. Murphy, C. Nehrkorn, H. Nelson, F. Neves, R.A. Ott, M. Pangilinan, P.D. Parker, E.K. Pease, K. Pech, P. Phelps, L. Reichhart, T. Shutt, C. Silva, V.N. Solovov, P. Sorensen, K. O'Sullivan, T. Sumner, D. Taylor, B. Tennyson, D.R. Tiedt, M. Tripathi, S. Uvarov, J.R. Verbus, N. Walsh, R. Webb, J.T. White, M.S. Witherell, F.L.H. Wolfs, M. Woods, and C. Zhang
A Detailed Look at the First Results from the Large Underground Xenon (LUX) Dark Matter Experiment
16 pages, 3 figures, to appear in the proceedings of The 10th International Symposium on Cosmology and Particle Astrophysics (CosPA2013); fixed author list and added info on new calibration
null
null
null
hep-ex astro-ph.CO astro-ph.IM physics.ins-det
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
LUX, the world's largest dual-phase xenon time-projection chamber, with a fiducial target mass of 118 kg and 10,091 kg-days of exposure thus far, is currently the most sensitive direct dark matter search experiment. The initial null-result limit on the spin-independent WIMP-nucleon scattering cross-section was released in October 2013, with a primary scintillation threshold of 2 phe, roughly 3 keVnr for LUX. The detector has been deployed at the Sanford Underground Research Facility (SURF) in Lead, South Dakota, and is the first experiment to achieve a limit on the WIMP cross-section lower than $10^{-45}$ cm$^{2}$. Here we present a more in-depth discussion of the novel energy scale employed to better understand the nuclear recoil light and charge yields, and of the calibration sources, including the new internal tritium source. We found the LUX data to be in conflict with low-mass WIMP signal interpretations of other results.
[ { "created": "Sat, 15 Feb 2014 23:37:47 GMT", "version": "v1" }, { "created": "Tue, 25 Feb 2014 05:11:33 GMT", "version": "v2" } ]
2014-02-26
[ [ "Szydagis", "M.", "" ], [ "Akerib", "D. S.", "" ], [ "Araujo", "H. M.", "" ], [ "Bai", "X.", "" ], [ "Bailey", "A. J.", "" ], [ "Balajthy", "J.", "" ], [ "Bernard", "E.", "" ], [ "Bernstein", "A.", "" ], [ "Bradley", "A.", "" ], [ "Byram", "D.", "" ], [ "Cahn", "S. B.", "" ], [ "Carmona-Benitez", "M. C.", "" ], [ "Chan", "C.", "" ], [ "Chapman", "J. J.", "" ], [ "Chiller", "A. A.", "" ], [ "Chiller", "C.", "" ], [ "Coffey", "T.", "" ], [ "Currie", "A.", "" ], [ "de Viveiros", "L.", "" ], [ "Dobi", "A.", "" ], [ "Dobson", "J.", "" ], [ "Druszkiewicz", "E.", "" ], [ "Edwards", "B.", "" ], [ "Faham", "C. H.", "" ], [ "Fiorucci", "S.", "" ], [ "Flores", "C.", "" ], [ "Gaitskell", "R. J.", "" ], [ "Gehman", "V. M.", "" ], [ "Ghag", "C.", "" ], [ "Gibson", "K. R.", "" ], [ "Gilchriese", "M. G. D.", "" ], [ "Hall", "C.", "" ], [ "Hertel", "S. A.", "" ], [ "Horn", "M.", "" ], [ "Huang", "D. Q.", "" ], [ "Ihm", "M.", "" ], [ "Jacobsen", "R. G.", "" ], [ "Kazkaz", "K.", "" ], [ "Knoche", "R.", "" ], [ "Larsen", "N. A.", "" ], [ "Lee", "C.", "" ], [ "Lindote", "A.", "" ], [ "Lopes", "M. I.", "" ], [ "Malling", "D. C.", "" ], [ "Mannino", "R.", "" ], [ "McKinsey", "D. N.", "" ], [ "Mei", "D. -M.", "" ], [ "Mock", "J.", "" ], [ "Moongweluwan", "M.", "" ], [ "Morad", "J.", "" ], [ "Murphy", "A. St. J.", "" ], [ "Nehrkorn", "C.", "" ], [ "Nelson", "H.", "" ], [ "Neves", "F.", "" ], [ "Ott", "R. A.", "" ], [ "Pangilinan", "M.", "" ], [ "Parker", "P. D.", "" ], [ "Pease", "E. K.", "" ], [ "Pech", "K.", "" ], [ "Phelps", "P.", "" ], [ "Reichhart", "L.", "" ], [ "Shutt", "T.", "" ], [ "Silva", "C.", "" ], [ "Solovov", "V. N.", "" ], [ "Sorensen", "P.", "" ], [ "O'Sullivan", "K.", "" ], [ "Sumner", "T.", "" ], [ "Taylor", "D.", "" ], [ "Tennyson", "B.", "" ], [ "Tiedt", "D. R.", "" ], [ "Tripathi", "M.", "" ], [ "Uvarov", "S.", "" ], [ "Verbus", "J. R.", "" ], [ "Walsh", "N.", "" ], [ "Webb", "R.", "" ], [ "White", "J. T.", "" ], [ "Witherell", "M. S.", "" ], [ "Wolfs", "F. L. H.", "" ], [ "Woods", "M.", "" ], [ "Zhang", "C.", "" ] ]
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1402.3735
Dimitra Panagou
Dimitra Panagou, Matthew Turpin, Vijay Kumar
Decentralized Goal Assignment and Safe Trajectory Generation in Multi-Robot Networks via Multiple Lyapunov Functions
null
null
null
null
cs.MA cs.RO cs.SY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper considers the problem of decentralized goal assignment and trajectory generation for multi-robot networks when only local communication is available, and proposes an approach based on methods related to switched systems and set invariance. A family of Lyapunov-like functions is employed to encode the (local) decision making among candidate goal assignments, under which a group of connected agents chooses the assignment that results in the shortest total distance to the goals. An additional family of Lyapunov-like barrier functions is activated in the case when the optimal assignment may lead to colliding trajectories, maintaining thus system safety while preserving the convergence guarantees. The proposed switching strategies give rise to feedback control policies that are computationally efficient and scalable with the number of agents, and therefore suitable for applications including first-response deployment of robotic networks under limited information sharing. The efficacy of the proposed method is demonstrated via simulation results and experiments with six ground robots.
[ { "created": "Sat, 15 Feb 2014 23:55:12 GMT", "version": "v1" }, { "created": "Tue, 18 Feb 2014 12:49:21 GMT", "version": "v2" }, { "created": "Thu, 3 Oct 2019 17:30:27 GMT", "version": "v3" } ]
2019-10-04
[ [ "Panagou", "Dimitra", "" ], [ "Turpin", "Matthew", "" ], [ "Kumar", "Vijay", "" ] ]
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1402.3736
Jan Hubi\v{c}ka
Ji\v{r}\'i Fiala, Jan Hubi\v{c}ka, Yangjing Long
Universality of intervals of line graph order
13 pages, 8 figures, accepted to European Journal of Combinatorics
null
null
null
math.CO cs.DM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We prove that for every $d\geq 3$ the homomorphism order of the class of line graphs of finite graphs with maximal degree $d$ is universal. This means that every finite or countably infinite partially ordered set may be represented by line graphs of graphs with maximal degree $d$ ordered by the existence of a homomorphism.
[ { "created": "Sun, 16 Feb 2014 00:15:54 GMT", "version": "v1" }, { "created": "Fri, 18 Apr 2014 23:09:51 GMT", "version": "v2" } ]
2014-04-22
[ [ "Fiala", "Jiří", "" ], [ "Hubička", "Jan", "" ], [ "Long", "Yangjing", "" ] ]
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1402.3739
Sonia Buckley
Sonia Buckley, Marina Radulaski, Jan Petykiewicz, Konstantinos G. Lagoudakis, Ju-Hyung Kang, Mark Brongersma, Klaus Biermann, Jelena Vuckovic
Second harmonic generation in GaAs photonic crystal cavities in (111)B and (001) crystal orientations
replaced with minor changes
ACS Photonics, 2014, 1, 6, 516-523
10.1021/ph500054u
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We demonstrate second harmonic generation in photonic crystal cavities in (001) and (111)B oriented GaAs. The fundamental resonance is at 1800 nm, leading to second harmonic below the GaAs bandgap. Below-bandgap operation minimizes absorption of the second harmonic and two photon absorption of the pump. Photonic crystal cavities were fabricated in both orientations at various in-plane rotations of the GaAs substrate. The rotation dependence and farfield patterns of the second harmonic match simulation. We observe similar maximum efficiencies of 1.2 %/W in (001) and (111)B oriented GaAs.
[ { "created": "Sun, 16 Feb 2014 00:32:50 GMT", "version": "v1" }, { "created": "Tue, 8 Apr 2014 01:48:15 GMT", "version": "v2" }, { "created": "Mon, 7 Jul 2014 19:59:05 GMT", "version": "v3" } ]
2014-07-08
[ [ "Buckley", "Sonia", "" ], [ "Radulaski", "Marina", "" ], [ "Petykiewicz", "Jan", "" ], [ "Lagoudakis", "Konstantinos G.", "" ], [ "Kang", "Ju-Hyung", "" ], [ "Brongersma", "Mark", "" ], [ "Biermann", "Klaus", "" ], [ "Vuckovic", "Jelena", "" ] ]
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1402.3745
Franco Rappazzo
S. Dalena, A. F. Rappazzo, P. Dmitruk, A. Greco, W. H. Matthaeus
Test-particle acceleration in a hierarchical three-dimensional turbulence model
12 pages, 8 figures, ApJ (in press)
ApJ, 783, 143 (2014)
10.1088/0004-637X/783/2/143
null
astro-ph.SR physics.space-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The acceleration of charged particles is relevant to the solar corona over a broad range of scales and energies. High-energy particles are usually detected in concomitance with large energy release events like solar eruptions and flares, nevertheless acceleration can occur at smaller scales, characterized by dynamical activity near current sheets. To gain insight into the complex scenario of coronal charged particle acceleration, we investigate the properties of acceleration with a test-particle approach using three-dimensional magnetohydrodynamic (MHD) models. These are obtained from direct solutions of the reduced MHD equations, well suited for a plasma embedded in a strong axial magnetic field, relevant to the inner heliosphere. A multi-box, multi-scale technique is used to solve the equations of motion for protons. This method allows us to resolve an extended range of scales present in the system, namely from the ion inertial scale of the order of a meter up to macroscopic scales of the order of $10\,$km ($1/100$th of the outer scale of the system). This new technique is useful to identify the mechanisms that, acting at different scales, are responsible for acceleration to high energies of a small fraction of the particles in the coronal plasma. We report results that describe acceleration at different stages over a broad range of time, length and energy scales.
[ { "created": "Sun, 16 Feb 2014 02:08:27 GMT", "version": "v1" } ]
2014-02-27
[ [ "Dalena", "S.", "" ], [ "Rappazzo", "A. F.", "" ], [ "Dmitruk", "P.", "" ], [ "Greco", "A.", "" ], [ "Matthaeus", "W. H.", "" ] ]
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1402.3749
Aaron Becker
Aaron Becker and Erik D. Demaine and S\'andor P. Fekete and James McLurkin
Particle Computation: Designing Worlds to Control Robot Swarms with only Global Signals
8 pages, 7 figures, to appear IEEE International Conference on Robotics and Automation (ICRA 2014)
null
null
null
cs.RO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Micro- and nanorobots are often controlled by global input signals, such as an electromagnetic or gravitational field. These fields move each robot maximally until it hits a stationary obstacle or another stationary robot. This paper investigates 2D motion-planning complexity for large swarms of simple mobile robots (such as bacteria, sensors, or smart building material). In previous work we proved it is NP-hard to decide whether a given initial configuration can be transformed into a desired target configuration; in this paper we prove a stronger result: the problem of finding an optimal control sequence is PSPACE-complete. On the positive side, we show we can build useful systems by designing obstacles. We present a reconfigurable hardware platform and demonstrate how to form arbitrary permutations and build a compact absolute encoder. We then take the same platform and use dual-rail logic to build a universal logic gate that concurrently evaluates AND, NAND, NOR and OR operations. Using many of these gates and appropriate interconnects we can evaluate any logical expression.
[ { "created": "Sun, 16 Feb 2014 02:58:23 GMT", "version": "v1" } ]
2014-02-18
[ [ "Becker", "Aaron", "" ], [ "Demaine", "Erik D.", "" ], [ "Fekete", "Sándor P.", "" ], [ "McLurkin", "James", "" ] ]
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1402.3757
Weina Wang
Weina Wang, Lei Ying and Junshan Zhang
On the Relation Between Identifiability, Differential Privacy and Mutual-Information Privacy
null
null
null
null
cs.CR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper investigates the relation between three different notions of privacy: identifiability, differential privacy and mutual-information privacy. Under a unified privacy-distortion framework, where the distortion is defined to be the Hamming distance of the input and output databases, we establish some fundamental connections between these three privacy notions. Given a distortion level $D$, define $\epsilon_{\mathrm{i}}^*(D)$ to be the smallest (best) identifiability level, and $\epsilon_{\mathrm{d}}^*(D)$ to be the smallest differential privacy level. We characterize $\epsilon_{\mathrm{i}}^*(D)$ and $\epsilon_{\mathrm{d}}^*(D)$, and prove that $\epsilon_{\mathrm{i}}^*(D)-\epsilon_X\le\epsilon_{\mathrm{d}}^*(D)\le\epsilon_{\mathrm{i}}^*(D)$ for $D$ in some range, where $\epsilon_X$ is a constant depending on the distribution of the original database $X$, and diminishes to zero when the distribution of $X$ is uniform. Furthermore, we show that identifiability and mutual-information privacy are consistent in the sense that given distortion level $D$, the mechanism that optimizes the mutual-information privacy also minimizes the identifiability level.
[ { "created": "Sun, 16 Feb 2014 05:43:33 GMT", "version": "v1" }, { "created": "Wed, 25 Jun 2014 21:07:24 GMT", "version": "v2" }, { "created": "Sat, 22 Aug 2015 07:25:47 GMT", "version": "v3" } ]
2015-08-25
[ [ "Wang", "Weina", "" ], [ "Ying", "Lei", "" ], [ "Zhang", "Junshan", "" ] ]
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1402.3761
Stefano Longhi
Stefano Longhi
Bound states in the continuum in PT-symmetric optical lattices
2 figures, to appear in Opt. Lett
Optics Letters 39, 1697-1700 (2014)
10.1364/OL.39.001697
null
quant-ph physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Bound states in the continuum (BIC), i.e. normalizable modes with an energy embedded in the continuous spectrum of scattered states, are shown to exist in certain optical waveguide lattices with $\mathcal{PT}$-symmetric defects. Two distinct types of BIC modes are found: BIC states that exist in the broken $\mathcal{PT}$ phase, corresponding to exponentially-localized modes with either exponentially damped or amplified optical power; and BIC modes with sub-exponential spatial localization that can exist in the unbroken $\mathcal{PT}$ phase as well. The two types of BIC modes at the $\mathcal{PT}$ symmetry breaking point behave rather differently: while in the former case spatial localization is lost and the defect coherently radiates outgoing waves with an optical power that linearly increases with the propagation distance, in the latter case localization is maintained and the optical power increase is quadratic.
[ { "created": "Sun, 16 Feb 2014 06:42:53 GMT", "version": "v1" } ]
2014-03-19
[ [ "Longhi", "Stefano", "" ] ]
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1402.3762
Kimball A. Milton
K. A. Milton
Schwinger's Quantum Action Principle. I. From Dirac's Formulation through Feynman's Path Integrals to the Schwinger-Keldysh Method
49 pages, 8 figures, submitted to EPJ H
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null
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physics.hist-ph quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Starting from the earlier notions of stationary action principles, we show how Schwinger's Quantum Action Principle descended from Dirac's formulation, which independently led Feynman to his path-integral formulation of quantum mechanics. The connection between the two is brought out, and applications are discussed. The Keldysh-Schwinger time-cycle method of extracting matrix elements is described. Part II will discuss the variational formulation of quantum electrodynamics and the development of source theory.
[ { "created": "Sun, 16 Feb 2014 06:52:15 GMT", "version": "v1" } ]
2014-02-18
[ [ "Milton", "K. A.", "" ] ]
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1402.3763
Giuseppe Tomassetti
Alessandro Tiero and Giuseppe Tomassetti
On morphoelastic rods
null
null
null
null
physics.class-ph cond-mat.mtrl-sci
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Morphoelastic rods are thin bodies which can grow and can change their intrinsic curvature and torsion. We deduce a system of equations ruling accretion and remodeling in a morphoelastic rod by combining balance laws involving non-standard forces with constitutive prescriptions filtered by a dissipation principle that takes into account both standard and non-standard working. We find that, as in the theory of three-dimentional bulk growth proposed in [A. DiCarlo and S. Quiligotti, Mech. Res. Commun. 29 (2002) 449-456], it is possible to identify a universal coupling mechanism between stress and growth, conveyed by an Eshelbian driving force.
[ { "created": "Sun, 16 Feb 2014 06:52:41 GMT", "version": "v1" }, { "created": "Wed, 30 Jul 2014 12:14:30 GMT", "version": "v2" }, { "created": "Thu, 23 Oct 2014 14:09:44 GMT", "version": "v3" } ]
2014-10-24
[ [ "Tiero", "Alessandro", "" ], [ "Tomassetti", "Giuseppe", "" ] ]
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1402.3764
Stefano Longhi
S. Longhi and G. Della Valle
Optical lattices with exceptional points in the continuum
11 pages, 4 figures, slightly revised revision (corrected misprints in caption of Figs.2 and 4 from published version)
Phys. Rev. A 89, 052132 (2014)
10.1103/PhysRevA.89.052132
null
quant-ph physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The spectral, dynamical and topological properties of physical systems described by non-Hermitian (including $\mathcal{PT}$-symmetric) Hamiltonians are deeply modified by the appearance of exceptional points and spectral singularities. Here we show that exceptional points in the continuum can arise in non-Hermitian (yet admitting and entirely real-valued energy spectrum) optical lattices with engineered defects. At an exceptional point, the lattice sustains a bound state with an energy embedded in the spectrum of scattered states, similar to the von-Neumann Wigner bound states in the continuum of Hermitian lattices. However, the dynamical and scattering properties of the bound state at an exceptional point are deeply different from those of ordinary von-Neumann Wigner bound states in an Hermitian system. In particular, the bound state in the continuum at an exceptional point is an unstable state that can secularly grow by an infinitesimal perturbation. Such properties are discussed in details for transport of discretized light in a $\mathcal{PT}$-symmetric array of coupled optical waveguides, which could provide an experimentally accessible system to observe exceptional points in the continuum.
[ { "created": "Sun, 16 Feb 2014 06:56:26 GMT", "version": "v1" }, { "created": "Tue, 20 May 2014 05:04:36 GMT", "version": "v2" }, { "created": "Fri, 30 May 2014 05:26:24 GMT", "version": "v3" } ]
2015-06-18
[ [ "Longhi", "S.", "" ], [ "Della Valle", "G.", "" ] ]
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1402.3766
Pascal Vanier
Alex Borello (LACL), Julien Cervelle (LACL), Pascal Vanier
Turing degrees of limit sets of cellular automata
null
null
null
null
cs.FL nlin.CG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Cellular automata are discrete dynamical systems and a model of computation. The limit set of a cellular automaton consists of the configurations having an infinite sequence of preimages. It is well known that these always contain a computable point and that any non-trivial property on them is undecidable. We go one step further in this article by giving a full characterization of the sets of Turing degrees of cellular automata: they are the same as the sets of Turing degrees of effectively closed sets containing a computable point.
[ { "created": "Sun, 16 Feb 2014 07:01:24 GMT", "version": "v1" } ]
2014-02-18
[ [ "Borello", "Alex", "", "LACL" ], [ "Cervelle", "Julien", "", "LACL" ], [ "Vanier", "Pascal", "" ] ]
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1402.3774
Pavel Klav\'ik
Ji\v{r}\'i Fiala, Pavel Klav\'ik, Jan Kratochv\'il, Roman Nedela
Algorithmic Aspects of Regular Graph Covers with Applications to Planar Graphs
The conference version accepted to ICALP 2014
null
null
null
math.CO cs.DM cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A graph $G$ covers a graph $H$ if there exists a locally bijective homomorphism from $G$ to $H$. We deal with regular covers in which this locally bijective homomorphism is prescribed by an action of a subgroup of ${\rm Aut}(G)$. Regular covers have many applications in constructions and studies of big objects all over mathematics and computer science. We study computational aspects of regular covers that have not been addressed before. The decision problem RegularCover asks for two given graphs $G$ and $H$ whether $G$ regularly covers $H$. When $|H|=1$, this problem becomes Cayley graph recognition for which the complexity is still unresolved. Another special case arises for $|G| = |H|$ when it becomes the graph isomorphism problem. Therefore, we restrict ourselves to graph classes with polynomially solvable graph isomorphism. Inspired by Negami, we apply the structural results used by Babai in the 1970's to study automorphism groups of graphs. Our main result is the following FPT meta-algorithm: Let $\cal C$ be a class of graphs such that the structure of automorphism groups of 3-connected graphs in $\cal C$ is simple. Then we can solve RegularCover for $\cal C$-inputs $G$ in time $O^*(2^{e(H)/2})$ where $e(H)$ denotes the number of the edges of $H$. As one example of $\cal C$, this meta-algorithm applies to planar graphs. In comparison, testing general graph covers is known to be NP-complete for planar inputs $G$ even for small fixed graphs $H$ such as $K_4$ or $K_5$. Most of our results also apply to general graphs, in particular the complete structural understanding of regular covers for 2-cuts.
[ { "created": "Sun, 16 Feb 2014 09:04:43 GMT", "version": "v1" }, { "created": "Wed, 28 May 2014 00:17:09 GMT", "version": "v2" } ]
2014-05-29
[ [ "Fiala", "Jiří", "" ], [ "Klavík", "Pavel", "" ], [ "Kratochvíl", "Jan", "" ], [ "Nedela", "Roman", "" ] ]
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1402.3777
Ashok Vudayagiri
P Anantha Lakshmi, Ashoka Vudayagiri and Shaik Ahmed
Effect of pairwise Dipole - Dipole interaction among three atoms Systems
12 figures
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physics.atom-ph quant-ph
http://creativecommons.org/licenses/by-nc-sa/3.0/
We present analysis of a system of three two-level atoms interacting with each other through the dipole-dipole interaction. The interaction manifests between excited state of one of the atoms and the ground state of its nearest neighbour. Steady state populations of the density matrix elements are presented and are compared with a situation when only two atoms are present. It can be noticed that the third atom modifies the behaviour of the three atoms. Two configurations are analysed, one in which the three atoms are in a line, with no interaction between atoms at the end points and the other in which the atoms form a closed loop with each atom interacting with both its neighbours.
[ { "created": "Sun, 16 Feb 2014 09:23:49 GMT", "version": "v1" } ]
2014-02-18
[ [ "Lakshmi", "P Anantha", "" ], [ "Vudayagiri", "Ashoka", "" ], [ "Ahmed", "Shaik", "" ] ]
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1402.3779
Nikolaos Mavridis
Nikolaos Mavridis, Nicola Bellotto, Konstantinos Iliopoulos, Nico Van de Weghe
QTC3D: Extending the Qualitative Trajectory Calculus to Three Dimensions
null
null
null
null
cs.OH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Spatial interactions between agents (humans, animals, or machines) carry information of high value to human or electronic observers. However, not all the information contained in a pair of continuous trajectories is important and thus the need for qualitative descriptions of interaction trajectories arises. The Qualitative Trajectory Calculus (QTC) (Van de Weghe, 2004) is a promising development towards this goal. Numerous variants of QTC have been proposed in the past and QTC has been applied towards analyzing various interaction domains. However, an inherent limitation of those QTC variations that deal with lateral movements is that they are limited to two-dimensional motion; therefore, complex three-dimensional interactions, such as those occurring between flying planes or birds, cannot be captured. Towards that purpose, in this paper QTC3Dis presented: a novel qualitative trajectory calculus that can deal with full three-dimensional interactions. QTC3D is based on transformations of the Frenet-Serret frames accompanying the trajectories of the moving objects. Apart from the theoretical exposition, including definition and properties, as well as computational aspects, we also present an application of QTC3D towards modeling bird flight. Thus, the power of QTC is now extended to the full dimensionality of physical space, enabling succinct yet rich representations of spatial interactions between agents.
[ { "created": "Sun, 16 Feb 2014 10:05:25 GMT", "version": "v1" } ]
2014-02-18
[ [ "Mavridis", "Nikolaos", "" ], [ "Bellotto", "Nicola", "" ], [ "Iliopoulos", "Konstantinos", "" ], [ "Van de Weghe", "Nico", "" ] ]
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1402.3781
Haytham Alzeini Mr.
H I Alzeini, Sh A Hameed and M H Habaebi
A Framework for Developing Real-Time OLAP algorithm using Multi-core processing and GPU: Heterogeneous Computing
null
null
null
null
cs.DC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The overwhelmingly increasing amount of stored data has spurred researchers seeking different methods in order to optimally take advantage of it which mostly have faced a response time problem as a result of this enormous size of data. Most of solutions have suggested materialization as a favourite solution. However, such a solution cannot attain Real- Time answers anyhow. In this paper we propose a framework illustrating the barriers and suggested solutions in the way of achieving Real-Time OLAP answers that are significantly used in decision support systems and data warehouses.
[ { "created": "Sun, 16 Feb 2014 10:11:57 GMT", "version": "v1" } ]
2014-02-18
[ [ "Alzeini", "H I", "" ], [ "Hameed", "Sh A", "" ], [ "Habaebi", "M H", "" ] ]
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1402.3782
Vincent Chau
Eric Angel, Evripidis Bampis, Vincent Chau, Nguyen Kim Thang
Throughput Maximization in Multiprocessor Speed-Scaling
null
null
null
null
cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We are given a set of $n$ jobs that have to be executed on a set of $m$ speed-scalable machines that can vary their speeds dynamically using the energy model introduced in [Yao et al., FOCS'95]. Every job $j$ is characterized by its release date $r_j$, its deadline $d_j$, its processing volume $p_{i,j}$ if $j$ is executed on machine $i$ and its weight $w_j$. We are also given a budget of energy $E$ and our objective is to maximize the weighted throughput, i.e. the total weight of jobs that are completed between their respective release dates and deadlines. We propose a polynomial-time approximation algorithm where the preemption of the jobs is allowed but not their migration. Our algorithm uses a primal-dual approach on a linearized version of a convex program with linear constraints. Furthermore, we present two optimal algorithms for the non-preemptive case where the number of machines is bounded by a fixed constant. More specifically, we consider: {\em (a)} the case of identical processing volumes, i.e. $p_{i,j}=p$ for every $i$ and $j$, for which we present a polynomial-time algorithm for the unweighted version, which becomes a pseudopolynomial-time algorithm for the weighted throughput version, and {\em (b)} the case of agreeable instances, i.e. for which $r_i \le r_j$ if and only if $d_i \le d_j$, for which we present a pseudopolynomial-time algorithm. Both algorithms are based on a discretization of the problem and the use of dynamic programming.
[ { "created": "Sun, 16 Feb 2014 10:15:47 GMT", "version": "v1" } ]
2014-02-18
[ [ "Angel", "Eric", "" ], [ "Bampis", "Evripidis", "" ], [ "Chau", "Vincent", "" ], [ "Thang", "Nguyen Kim", "" ] ]
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1402.3783
Francesco Montorsi Dr.
Francesco Montorsi, Fabrizio Pancaldi, Giorgio M. Vitetta
Map-Aware Models for Indoor Wireless Localization Systems: An Experimental Study
13 pages, 11 figures, 1 table. IEEE Transactions on Wireless Communications, 2014
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null
null
cs.IT math.IT stat.AP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The accuracy of indoor wireless localization systems can be substantially enhanced by map-awareness, i.e., by the knowledge of the map of the environment in which localization signals are acquired. In fact, this knowledge can be exploited to cancel out, at least to some extent, the signal degradation due to propagation through physical obstructions, i.e., to the so called non-line-of-sight bias. This result can be achieved by developing novel localization techniques that rely on proper map-aware statistical modelling of the measurements they process. In this manuscript a unified statistical model for the measurements acquired in map-aware localization systems based on time-of-arrival and received signal strength techniques is developed and its experimental validation is illustrated. Finally, the accuracy of the proposed map-aware model is assessed and compared with that offered by its map-unaware counterparts. Our numerical results show that, when the quality of acquired measurements is poor, map-aware modelling can enhance localization accuracy by up to 110% in certain scenarios.
[ { "created": "Sun, 16 Feb 2014 10:50:01 GMT", "version": "v1" } ]
2014-02-18
[ [ "Montorsi", "Francesco", "" ], [ "Pancaldi", "Fabrizio", "" ], [ "Vitetta", "Giorgio M.", "" ] ]
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1402.3788
Natalya Litvinenko
Natalya Litvinenko
Using of GPUs for cluster analysis of large data by K-means method
null
null
null
null
cs.DC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This problem was solved within the framework of the grant project "Solving of problems of cluster analysis with application of parallel algorithms and cloud technologies" in the Institute of Mathematics and Mathematical Modelling in Almaty. The problem of cluster analysis for the large amount of data is very important in different areas of science - genetics, biology, sociology etc. At the same time, such statistical known packages as STATISTICA, STADIA, SYSTAT and others do not allow to solve large problems. The new algorithm that uses the high processing power of GPUs for solving clustering problems by the K-means method was developed. This algorithm is implemented as a C++ application in Microsoft Visual Studio 2010 with using the GPU Nvidia GeForce 660. The developed software package for solving clustering problems by the method of K - means with using GPUs allows us to handle up to 2 million records with number of features up to 25. The gain in the computing time is in factor 5. We plan to increase this factor up to 20-30 after improving the algorithms.
[ { "created": "Sun, 16 Feb 2014 11:36:39 GMT", "version": "v1" } ]
2014-02-18
[ [ "Litvinenko", "Natalya", "" ] ]
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1402.3789
Natalya Litvinenko
Natalya Litvinenko
Parallel algorithms for problems of cluster analysis with very large amount of data
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null
null
null
cs.DC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we solve on GPUs massive problems with large amount of data, which are not appropriate for solution with the SIMD technology. For the given problem we consider a three-level parallelization. The multithreading of CPU is used at the top level and graphic processors for massive computing. For solving problems of cluster analysis on GPUs the nearest neighbor method (NNM) is developed. This algorithm allows us to handle up to 2 millions records with number of features up to 25. Since sequential and parallel algorithms are fundamentally different, it is difficult to compare the computation times. However, some comparisons are made. The gain in the computing time is about 10 times. We plan to increase this factor up to 50-100 after fine tuning of algorithms.
[ { "created": "Sun, 16 Feb 2014 11:53:30 GMT", "version": "v1" } ]
2014-02-18
[ [ "Litvinenko", "Natalya", "" ] ]
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1402.3792
Alexander Silenko
Alexander J. Silenko
Electric Current Multipole Moments in Classical Electrodynamics
12 pages
Progress of Theoretical Physics (1999) 101 (4): 875-884
10.1143/PTP.101.875
null
physics.class-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The general theory for electric current multipoles appearing at the motion of magnetic dipoles and change in these values or orientation has been suggested. Static multipoles, including an anapole, have been studied in detail.
[ { "created": "Sun, 16 Feb 2014 12:26:30 GMT", "version": "v1" } ]
2014-02-18
[ [ "Silenko", "Alexander J.", "" ] ]
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1402.3793
Steffen Greilich
Raya R. Gallas, Nora H\"unemohr, Armin Runz, Nina I. Niebuhr, Oliver J\"akel and Steffen Greilich
An anthropomorphic multimodality (CT/MRI) phantom prototype for end-to-end tests in radiation therapy
18 pages, 6 figures
Zeitschrift fuer medizinische Physik, 2015, 25, 391-399
10.1016/j.zemedi.2015.05.003
null
physics.med-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
With the increasing complexity of external beam therapy, so-called "end-to-end" tests are intended to cover all steps from therapy planning to follow-up to fulfill the high demands on quality assurance. As magnetic resonance imaging (MRI) gains growing importance in the treatment process and established phantoms (such as the Alderson head) cannot be used for those tests, novel multimodality phantoms have to be developed. Here, we present a feasibility study for such a customizable multimodality head phantom. We used a set of patient CT images as the basis for the anthropomorphic head shape. The recipient - consisting of an epoxy resin - was produced using rapid prototyping (3D printing). The phantom recipient includes a nasal air cavity, two soft tissues volumes and cranial bone. Additionally a spherical tumor volume was positioned in the center. The volumes were filled with dipotassium phosphate-based cranial bone surrogate, agarose gel, and distilled water. The tumor volume was filled with normoxic dosimetric gel. The entire workflow of radiation therapy including a clinical proton irradiation could be successfully applied to the phantom. CT measurements revealed Hounsfield units agreeing with reference values for all surrogates. The MRI contrasts corresponded to the expectations on the phantom materials except for the bone surrogate providing an undesirably high signal intensity. The dose verification by T2-weighted read out of the polymerization gel dosimeter could successfully show a correct plan delivery in terms of particle range.
[ { "created": "Sun, 16 Feb 2014 12:29:13 GMT", "version": "v1" }, { "created": "Wed, 8 Jul 2015 09:42:17 GMT", "version": "v2" } ]
2015-12-07
[ [ "Gallas", "Raya R.", "" ], [ "Hünemohr", "Nora", "" ], [ "Runz", "Armin", "" ], [ "Niebuhr", "Nina I.", "" ], [ "Jäkel", "Oliver", "" ], [ "Greilich", "Steffen", "" ] ]
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1402.3796
Moti Medina
Guy Even, Moti Medina, Dana Ron
Best of Two Local Models: Local Centralized and Local Distributed Algorithms
null
null
null
null
cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider two models of computation: centralized local algorithms and local distributed algorithms. Algorithms in one model are adapted to the other model to obtain improved algorithms. Distributed vertex coloring is employed to design improved centralized local algorithms for: maximal independent set, maximal matching, and an approximation scheme for maximum (weighted) matching over bounded degree graphs. The improvement is threefold: the algorithms are deterministic, stateless, and the number of probes grows polynomially in $\log^* n$, where $n$ is the number of vertices of the input graph. The recursive centralized local improvement technique by Nguyen and Onak~\cite{onak2008} is employed to obtain an improved distributed approximation scheme for maximum (weighted) matching. The improvement is twofold: we reduce the number of rounds from $O(\log n)$ to $O(\log^*n)$ for a wide range of instances and, our algorithms are deterministic rather than randomized.
[ { "created": "Sun, 16 Feb 2014 13:09:06 GMT", "version": "v1" }, { "created": "Tue, 18 Feb 2014 13:24:41 GMT", "version": "v2" }, { "created": "Tue, 11 Nov 2014 20:33:00 GMT", "version": "v3" } ]
2014-11-12
[ [ "Even", "Guy", "" ], [ "Medina", "Moti", "" ], [ "Ron", "Dana", "" ] ]
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1402.3797
Pratik Vinay Gupte
Pratik Vinay Gupte and Balaraman Ravindran
Scalable Positional Analysis for Studying Evolution of Nodes in Networks
Presented at the workshop on Mining Networks and Graphs: A Big Data Analytic Challenge, held in conjunction with the SIAM Data Mining (SDM) Conference in April 2014. 13 pages
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cs.SI physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In social network analysis, the fundamental idea behind the notion of position is to discover actors who have similar structural signatures. Positional analysis of social networks involves partitioning the actors into disjoint sets using a notion of equivalence which captures the structure of relationships among actors. Classical approaches to Positional Analysis, such as Regular equivalence and Equitable Partitions, are too strict in grouping actors and often lead to trivial partitioning of actors in real world networks. An Epsilon Equitable Partition (EEP) of a graph, which is similar in spirit to Stochastic Blockmodels, is a useful relaxation to the notion of structural equivalence which results in meaningful partitioning of actors. In this paper we propose and implement a new scalable distributed algorithm based on MapReduce methodology to find EEP of a graph. Empirical studies on random power-law graphs show that our algorithm is highly scalable for sparse graphs, thereby giving us the ability to study positional analysis on very large scale networks. We also present the results of our algorithm on time evolving snapshots of the facebook and flickr social graphs. Results show the importance of positional analysis on large dynamic networks.
[ { "created": "Sun, 16 Feb 2014 13:09:43 GMT", "version": "v1" }, { "created": "Tue, 20 Jan 2015 18:46:36 GMT", "version": "v2" } ]
2015-01-21
[ [ "Gupte", "Pratik Vinay", "" ], [ "Ravindran", "Balaraman", "" ] ]
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1402.3801
Manish Gupta
Krishna Gopal Benerjee and Manish Kumar Gupta
On Heterogeneous Regenerating Codes and Capacity of Distributed Storage Systems
submitted to conference Netcod 2014, 3 figures, 5 pages
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Heterogeneous Distributed Storage Systems (DSS) are close to real world applications for data storage. Internet caching system and peer-to-peer storage clouds are the examples of such DSS. In this work, we calculate the capacity formula for such systems where each node store different number of packets and each having a different repair bandwidth (node can be repaired by contacting a specific set of nodes). The tradeoff curve between storage and repair bandwidth is studied for such heterogeneous DSS. By analyzing the capacity formula new minimum bandwidth regenerating (MBR) and minimum storage regenerating (MBR) points are obtained on the curve. It is shown that in some cases these are better than the homogeneous DSS.
[ { "created": "Sun, 16 Feb 2014 14:16:31 GMT", "version": "v1" } ]
2014-02-18
[ [ "Benerjee", "Krishna Gopal", "" ], [ "Gupta", "Manish Kumar", "" ] ]
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1402.3809
Michael Heroux
Michael A. Heroux
Toward Resilient Algorithms and Applications
null
null
null
null
cs.MS cs.DC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Over the past decade, the high performance computing community has become increasingly concerned that preserving the reliable, digital machine model will become too costly or infeasible. In this paper we discuss four approaches for developing new algorithms that are resilient to hard and soft failures.
[ { "created": "Sun, 16 Feb 2014 15:43:05 GMT", "version": "v1" }, { "created": "Thu, 13 Mar 2014 17:55:31 GMT", "version": "v2" } ]
2014-03-14
[ [ "Heroux", "Michael A.", "" ] ]
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1402.3811
Zhi-Hua Zhou
Wei Gao and Zhi-Hua Zhou
Dropout Rademacher Complexity of Deep Neural Networks
20 pagea
Science China Information Sciences, 2016, 59(7): 072104:1-072104:12
null
null
cs.NE stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Great successes of deep neural networks have been witnessed in various real applications. Many algorithmic and implementation techniques have been developed, however, theoretical understanding of many aspects of deep neural networks is far from clear. A particular interesting issue is the usefulness of dropout, which was motivated from the intuition of preventing complex co-adaptation of feature detectors. In this paper, we study the Rademacher complexity of different types of dropout, and our theoretical results disclose that for shallow neural networks (with one or none hidden layer) dropout is able to reduce the Rademacher complexity in polynomial, whereas for deep neural networks it can amazingly lead to an exponential reduction of the Rademacher complexity.
[ { "created": "Sun, 16 Feb 2014 15:54:37 GMT", "version": "v1" }, { "created": "Wed, 2 Jul 2014 14:36:28 GMT", "version": "v2" } ]
2020-07-07
[ [ "Gao", "Wei", "" ], [ "Zhou", "Zhi-Hua", "" ] ]
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1402.3814
Vincenzo Laporta
V. Laporta, D.A. Little, R. Celiberto and J. Tennyson
Electron-impact resonant vibrational excitation and dissociation processes involving vibrationally excited N2 molecules
null
null
10.1088/0963-0252/23/6/065002
null
physics.plasm-ph physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Resonant vibrational excitation cross sections and the corresponding rate coefficients for electron-N$_2$ collisions occurring through the N$_2^-(\textrm{X}\ ^2\Pi_g)$ resonant state are reviewed. New calculations are performed using accurate potential energies curves for the N$_2$ electronic ground state, taken from literature, and for the N$_2^-$ resonant state, obtained from $R$-matrix calculations. The calculations are extended also to the resonant excitation processes involving the N$_2$ ground state vibrational continuum, leading to dissociation. Electron impact dissociation is found to be significant from higher vibrational levels. Accurate analytical fits for the complete set of the rate coefficients are provided. The behavior of the dissociative cross sections is investigated for rotationally excited N$_2$ molecules, with $J=50,100$ and 150 and for different vibrational levels.
[ { "created": "Sun, 16 Feb 2014 16:51:17 GMT", "version": "v1" }, { "created": "Sun, 8 Jun 2014 10:25:46 GMT", "version": "v2" } ]
2015-06-18
[ [ "Laporta", "V.", "" ], [ "Little", "D. A.", "" ], [ "Celiberto", "R.", "" ], [ "Tennyson", "J.", "" ] ]
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1402.3821
Ylies Falcone
Tom Cornebize and Yli\`es Falcone
Efficient and Generalized Decentralized Monitoring of Regular Languages
null
null
null
null
cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The main contribution of this paper is an efficient and generalized decentralized monitoring algorithm allowing to detect satisfaction or violation of any regular specification by local monitors alone in a system without central observation point. Our algorithm does not assume any form of synchronization between system events and communication of monitors, uses state machines as underlying mechanism for efficiency, and tries to keep the number and size of messages exchanged between monitors to a minimum. We provide a full implementation of the algorithm with an open-source benchmark to evaluate its efficiency in terms of number, size of exchanged messages, and delay induced by communication between monitors. Experimental results demonstrate the effectiveness of our algorithm which outperforms the previous most general one along several (new) monitoring metrics.
[ { "created": "Sun, 16 Feb 2014 17:49:57 GMT", "version": "v1" } ]
2014-02-18
[ [ "Cornebize", "Tom", "" ], [ "Falcone", "Yliès", "" ] ]
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1402.3822
Yanying Feng
H. B. Xue, Y. Y. Feng, S. Chen, X. J. Wang, X. S. Yan, Z. K. Jiang and Z. Y. Zhou
A Cold Atomic Beam Interferometer
16 pages, 5 figures
null
10.1063/1.4913711
null
physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We demonstrate an atom interferometer that uses a laser-cooled continuous beam of $^{87}$Rb atoms having velocities of 10--20 m/s. With spatially separated Raman beams to coherently manipulate the atomic wave packets, Mach--Zehnder interference fringes are observed at an interference distance of 2L = 19 mm. The apparatus operates within a small enclosed area of 0.07 mm$^2$ at a bandwidth of 190 Hz with a deduced sensitivity of $7.8\times10^{-5}$ rad/s/$\sqrt{{Hz}}$ for rotations. Using a low-velocity continuous atomic source in an atom interferometer enables high sampling rates and bandwidths without sacrificing sensitivity and compactness, which are important for applications in real dynamic environments.
[ { "created": "Sun, 16 Feb 2014 18:00:14 GMT", "version": "v1" }, { "created": "Sat, 8 Nov 2014 06:24:07 GMT", "version": "v2" } ]
2015-06-18
[ [ "Xue", "H. B.", "" ], [ "Feng", "Y. Y.", "" ], [ "Chen", "S.", "" ], [ "Wang", "X. J.", "" ], [ "Yan", "X. S.", "" ], [ "Jiang", "Z. K.", "" ], [ "Zhou", "Z. Y.", "" ] ]
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1402.3827
Mark Kuzyk
Mark G. Kuzyk
A Heuristic Approach for Treating Pathologies of Truncated Sum Rules in Limit Theory of Nonlinear Susceptibilities
27 pages and 10 figures
null
null
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Thomas Kuhn Reich sum rules and the sum-over-states (SOS) expression for the hyperpolarizabilities are truncated when calculating the fundamental limits of nonlinear susceptibilities. Truncation of the SOS expression can lead to an accurate approximation of the first and second hyperpolarizabilities due to energy denominators, which can make the truncated series converge to within 10% of the full series after only a few excited states are included in the sum. The terms in the sum rule series, however, are weighted by the state energies, so convergence of the series requires that the position matrix elements scale at most in inverse proportion to the square root of the energy. Even if the convergence condition is met, serious pathologies arise, including self inconsistent sum rules and equations that contradict reality. As a result, using the truncated sum rules alone leads to pathologies that make any rigorous calculations impossible, let alone yielding even good approximations. This paper discusses conditions under which pathologies can be swept under the rug and how the theory of limits, when properly culled and extrapolated using heuristic arguments, can lead to a semi-rigorous theory that successfully predicts the behavior of all known quantum systems, both when tested against exact calculations or measurements of broad classes of molecules.
[ { "created": "Sun, 16 Feb 2014 18:53:45 GMT", "version": "v1" } ]
2014-02-18
[ [ "Kuzyk", "Mark G.", "" ] ]
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1402.3835
Cl\'ement Canonne
Cl\'ement Canonne and Ronitt Rubinfeld
Testing probability distributions underlying aggregated data
null
null
null
null
cs.DS cs.DM math.PR math.ST stat.TH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we analyze and study a hybrid model for testing and learning probability distributions. Here, in addition to samples, the testing algorithm is provided with one of two different types of oracles to the unknown distribution $D$ over $[n]$. More precisely, we define both the dual and cumulative dual access models, in which the algorithm $A$ can both sample from $D$ and respectively, for any $i\in[n]$, - query the probability mass $D(i)$ (query access); or - get the total mass of $\{1,\dots,i\}$, i.e. $\sum_{j=1}^i D(j)$ (cumulative access) These two models, by generalizing the previously studied sampling and query oracle models, allow us to bypass the strong lower bounds established for a number of problems in these settings, while capturing several interesting aspects of these problems -- and providing new insight on the limitations of the models. Finally, we show that while the testing algorithms can be in most cases strictly more efficient, some tasks remain hard even with this additional power.
[ { "created": "Sun, 16 Feb 2014 20:00:00 GMT", "version": "v1" } ]
2014-02-18
[ [ "Canonne", "Clément", "" ], [ "Rubinfeld", "Ronitt", "" ] ]
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1402.3847
Daniele de Rigo
Claudio Bosco, Daniele de Rigo, Olivier Dewitte and Luca Montanarella
Towards the reproducibility in soil erosion modeling: a new Pan-European soil erosion map
9 pages, from a poster presented at the Wageningen Conference on Applied Soil Science "Soil Science in a Changing World", 18 - 22 September 2011, Wageningen, The Netherlands
null
10.6084/m9.figshare.936872
null
cs.SY cs.CE physics.geo-ph
http://creativecommons.org/licenses/by/3.0/
Soil erosion by water is a widespread phenomenon throughout Europe and has the potentiality, with his on-site and off-site effects, to affect water quality, food security and floods. Despite the implementation of numerous and different models for estimating soil erosion by water in Europe, there is still a lack of harmonization of assessment methodologies. Often, different approaches result in soil erosion rates significantly different. Even when the same model is applied to the same region the results may differ. This can be due to the way the model is implemented (i.e. with the selection of different algorithms when available) and/or to the use of datasets having different resolution or accuracy. Scientific computation is emerging as one of the central topic of the scientific method, for overcoming these problems there is thus the necessity to develop reproducible computational method where codes and data are available. The present study illustrates this approach. Using only public available datasets, we applied the Revised Universal Soil loss Equation (RUSLE) to locate the most sensitive areas to soil erosion by water in Europe. A significant effort was made for selecting the better simplified equations to be used when a strict application of the RUSLE model is not possible. In particular for the computation of the Rainfall Erosivity factor (R) the reproducible research paradigm was applied. The calculation of the R factor was implemented using public datasets and the GNU R language. An easily reproducible validation procedure based on measured precipitation time series was applied using MATLAB language. Designing the computational modelling architecture with the aim to ease as much as possible the future reuse of the model in analysing climate change scenarios is also a challenging goal of the research.
[ { "created": "Sun, 16 Feb 2014 22:10:42 GMT", "version": "v1" } ]
2014-02-18
[ [ "Bosco", "Claudio", "" ], [ "de Rigo", "Daniele", "" ], [ "Dewitte", "Olivier", "" ], [ "Montanarella", "Luca", "" ] ]
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1402.3849
Radha Chitta
Radha Chitta, Rong Jin, Timothy C. Havens, Anil K. Jain
Scalable Kernel Clustering: Approximate Kernel k-means
15 pages, 6 figures,extension of the work "Approximate Kernel k-means: Solution to large scale kernel clustering" published in KDD 2011
null
null
null
cs.CV cs.DS cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Kernel-based clustering algorithms have the ability to capture the non-linear structure in real world data. Among various kernel-based clustering algorithms, kernel k-means has gained popularity due to its simple iterative nature and ease of implementation. However, its run-time complexity and memory footprint increase quadratically in terms of the size of the data set, and hence, large data sets cannot be clustered efficiently. In this paper, we propose an approximation scheme based on randomization, called the Approximate Kernel k-means. We approximate the cluster centers using the kernel similarity between a few sampled points and all the points in the data set. We show that the proposed method achieves better clustering performance than the traditional low rank kernel approximation based clustering schemes. We also demonstrate that its running time and memory requirements are significantly lower than those of kernel k-means, with only a small reduction in the clustering quality on several public domain large data sets. We then employ ensemble clustering techniques to further enhance the performance of our algorithm.
[ { "created": "Sun, 16 Feb 2014 22:19:40 GMT", "version": "v1" } ]
2014-02-18
[ [ "Chitta", "Radha", "" ], [ "Jin", "Rong", "" ], [ "Havens", "Timothy C.", "" ], [ "Jain", "Anil K.", "" ] ]
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1402.3851
Ioannis Koutis
Ioannis Koutis
Simple parallel and distributed algorithms for spectral graph sparsification
replaces "A simple parallel and distributed algorithm for spectral sparsification". Minor changes
null
null
null
cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We describe a simple algorithm for spectral graph sparsification, based on iterative computations of weighted spanners and uniform sampling. Leveraging the algorithms of Baswana and Sen for computing spanners, we obtain the first distributed spectral sparsification algorithm. We also obtain a parallel algorithm with improved work and time guarantees. Combining this algorithm with the parallel framework of Peng and Spielman for solving symmetric diagonally dominant linear systems, we get a parallel solver which is much closer to being practical and significantly more efficient in terms of the total work.
[ { "created": "Sun, 16 Feb 2014 22:28:54 GMT", "version": "v1" }, { "created": "Thu, 17 Apr 2014 20:45:01 GMT", "version": "v2" } ]
2014-04-21
[ [ "Koutis", "Ioannis", "" ] ]
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1402.3853
Alex Harvey
Alex G Harvey, Danilo S Brambila, Felipe Morales and Olga Smirnova
Photoelectron angular distributions from aligned molecules using the R-matrix method
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null
null
null
physics.chem-ph physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a new extension of the UKRmol electron-molecule scattering code suite, which allows one to compute ab initio photoionization and photorecombination amplitudes for complex molecules, resolved both on the molecular alignment (orientation) and the emission angle and energy of the photoelectron. We illustrate our approach using CO$_2$ as an example, and analyze the importance of multi-channel effects by performing our calculations at different, increasing levels of complexity. We benchmark our method by comparing the results of our calculations with experimental data and with theoretical calculations available in the literature.
[ { "created": "Sun, 16 Feb 2014 22:53:41 GMT", "version": "v1" } ]
2014-02-18
[ [ "Harvey", "Alex G", "" ], [ "Brambila", "Danilo S", "" ], [ "Morales", "Felipe", "" ], [ "Smirnova", "Olga", "" ] ]
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1402.3856
Bj{\o}rn Kjos-Hanssen
Kayleigh Hyde, Bj{\o}rn Kjos-Hanssen
Nondeterministic automatic complexity of overlap-free and almost square-free words
Preliminary version: "Nondeterministic automatic complexity of almost square-free and strongly cube-free words", COCOON 2014, Lecture Notes in Computer Science 8591 (2014), 61--70
Electronic Journal of Combinatorics 22 (2015), no. 3, Paper 3.22, 18 pp
null
null
cs.FL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Shallit and Wang studied deterministic automatic complexity of words. They showed that the automatic Hausdorff dimension $I(\mathbf t)$ of the infinite Thue word satisfies $1/3\le I(\mathbf t)\le 2/3$. We improve that result by showing that $I(\mathbf t)\ge 1/2$. For nondeterministic automatic complexity we show $I(\mathbf t)=1/2$. We prove that such complexity $A_N$ of a word $x$ of length $n$ satisfies $A_N(x)\le b(n):=\lfloor n/2\rfloor + 1$. This enables us to define the complexity deficiency $D(x)=b(n)-A_N(x)$. If $x$ is square-free then $D(x)=0$. If $x$ almost square-free in the sense of Fraenkel and Simpson, or if $x$ is a strongly cube-free binary word such as the infinite Thue word, then $D(x)\le 1$. On the other hand, there is no constant upper bound on $D$ for strongly cube-free words in a ternary alphabet, nor for cube-free words in a binary alphabet. The decision problem whether $D(x)\ge d$ for given $x$, $d$ belongs to $NP\cap E$.
[ { "created": "Sun, 16 Feb 2014 23:19:02 GMT", "version": "v1" }, { "created": "Fri, 31 Jan 2020 18:44:58 GMT", "version": "v2" } ]
2020-02-03
[ [ "Hyde", "Kayleigh", "" ], [ "Kjos-Hanssen", "Bjørn", "" ] ]
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1402.3861
Timur Dzhatdoev
T. A. Dzhatdoev (on behalf of the OPERA Collaboration) and V. L. Troshina
Search for Neutrino Oscillations in Appearance Mode with the OPERA Experiment
Mini-review of the OPERA experiment analysis status (October 2013), 9 pages, 5 figures, to appear in Proc. HEPFT-2013
null
10.1142/9789814578745_0011
null
hep-ex astro-ph.HE hep-ph physics.ins-det
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The present paper highlights the data analysis status of the OPERA experiment. The experiment was designed to perform the neutrino interactions analysis on event-by-event basis, and optimized to search for $\nu_{\mu} \rightarrow \nu_{\tau}$ oscillation in appearance mode, also allowing to perform a $\nu_{e}$ appearance search. We review the data simulation and the analysis chains implemented to search for $\nu_{\tau}$ interactions. The main kinematical parameters sensitive to the neutrino flavor are discussed, the uncertainties of the event parameter estimation are reviewed, and the main sources of background for the $\nu_{\mu} \rightarrow \nu_{\tau}$ oscillation search are examined. The topologies of the two first $\nu_{\tau}$ candidate events are presented. Finally, we review the status of the $\nu_{e}$ appearance search and present the constraints set by the OPERA experiment on the mixing angle $\theta_{13}$ and on the LSND/MiniBooNE anomaly.
[ { "created": "Mon, 17 Feb 2014 00:59:40 GMT", "version": "v1" } ]
2017-08-23
[ [ "Dzhatdoev", "T. A.", "", "on behalf of the OPERA Collaboration" ], [ "Troshina", "V. L.", "" ] ]
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1402.3869
Yilun Wang
Yilun Wang
FTVd is beyond Fast Total Variation regularized Deconvolution
null
null
null
null
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we revisit the "FTVd" algorithm for Fast Total Variation Regularized Deconvolution, which has been widely used in the past few years. Both its original version implemented in the MATLAB software FTVd 3.0 and its related variant implemented in the latter version FTVd 4.0 are considered \cite{Wang08FTVdsoftware}. We propose that the intermediate results during the iterations are the solutions of a series of combined Tikhonov and total variation regularized image deconvolution models and therefore some of them often have even better image quality than the final solution, which is corresponding to the pure total variation regularized model.
[ { "created": "Mon, 17 Feb 2014 02:13:30 GMT", "version": "v1" }, { "created": "Fri, 16 May 2014 03:24:09 GMT", "version": "v2" } ]
2014-05-19
[ [ "Wang", "Yilun", "" ] ]
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