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1402.0812
Radu Arsinte
Alexandru Florin Antone and Radu Arsinte
A Study on the Optimal Implementation of Statistical Multiplexing in DVB Distribution Systems
8 pages, 17 figures
Informatics and IT Today, Volume 1, July 2013, pp.19-27
null
null
cs.MM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The paper presents an overview of the main methods used to improve the efficiency of DVB systems, based on multiplexing, through a study on the impact of the multiplexing methods used in DVB, having as a final goal a better usage of the data capacity and the possibility to insert new services into the original DVB Transport Stream. This study revealed that not all DVB providers are using statistical multiplexing. Based on this study, we were able to propose a method to improve the original DVB stream, originated from DVB-S or DVB-T providers. This method is proposing the detection of null packets, removal and reinserting a new service, with a VBR content. The method developed in this research can be implemented even in optimized statistical multiplexing systems, due to a residual use of null packets for data rate adjustment. There is no need to have access in the original stream multiplexer, since the method allows the implementation on the fly, near to the end user. The proposed method is proposed to be applied in DVB-S to DVB-C translation, using the computing power of a PC or in a FPGA implementation.
[ { "created": "Tue, 4 Feb 2014 18:05:37 GMT", "version": "v1" } ]
2014-02-05
[ [ "Antone", "Alexandru Florin", "" ], [ "Arsinte", "Radu", "" ] ]
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1402.0813
Mark Tame
G. Di Martino, Y. Sonnefraud, M. S. Tame, S. K\'ena-Cohen, F. Dieleman, \c{S}. K. \"Ozdemir, M. S. Kim and S. A. Maier
Observation of quantum interference in the plasmonic Hong-Ou-Mandel effect
5 pages, 3 figures
Phys. Rev. Applied 1, 034004 (2014)
10.1103/PhysRevApplied.1.034004
null
quant-ph cond-mat.mes-hall physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We report direct evidence of the bosonic nature of surface plasmon polaritons (SPPs) in a scattering-based beamsplitter. A parametric down-conversion source is used to produce two indistinguishable photons, each of which is converted into a SPP on a metal-stripe waveguide and then made to interact through a semi-transparent Bragg mirror. In this plasmonic analog of the Hong-Ou-Mandel experiment, we measure a coincidence dip with a visibility of 72%, a key signature that SPPs are bosons and that quantum interference is clearly involved.
[ { "created": "Tue, 4 Feb 2014 18:06:49 GMT", "version": "v1" } ]
2014-04-17
[ [ "Di Martino", "G.", "" ], [ "Sonnefraud", "Y.", "" ], [ "Tame", "M. S.", "" ], [ "Kéna-Cohen", "S.", "" ], [ "Dieleman", "F.", "" ], [ "Özdemir", "Ş. K.", "" ], [ "Kim", "M. S.", "" ], [ "Maier", "S. A.", "" ] ]
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1402.0815
Martin Tancer
Ji\v{r}\'i Matou\v{s}ek, Eric Sedgwick, Martin Tancer, Uli Wagner
Embeddability in the 3-sphere is decidable
54 pages, 26 figures; few faulty references to figures in the first version fixed
null
null
null
math.GT cs.CG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We show that the following algorithmic problem is decidable: given a $2$-dimensional simplicial complex, can it be embedded (topologically, or equivalently, piecewise linearly) in $\mathbf{R}^3$? By a known reduction, it suffices to decide the embeddability of a given triangulated 3-manifold $X$ into the 3-sphere $S^3$. The main step, which allows us to simplify $X$ and recurse, is in proving that if $X$ can be embedded in $S^3$, then there is also an embedding in which $X$ has a short meridian, i.e., an essential curve in the boundary of $X$ bounding a disk in $S^3\setminus X$ with length bounded by a computable function of the number of tetrahedra of $X$.
[ { "created": "Tue, 4 Feb 2014 18:07:36 GMT", "version": "v1" }, { "created": "Wed, 5 Feb 2014 13:44:10 GMT", "version": "v2" } ]
2014-02-06
[ [ "Matoušek", "Jiří", "" ], [ "Sedgwick", "Eric", "" ], [ "Tancer", "Martin", "" ], [ "Wagner", "Uli", "" ] ]
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1402.0816
Puxiang Lai
Puxiang Lai, Lidai Wang, Jian Wei Tay, and Lihong V. Wang
Nonlinear photoacoustic wavefront shaping (PAWS) for single speckle-grain optical focusing in scattering media
16 pages for main text, 31 pages in total, 5 figures
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null
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Non-invasively focusing light into strongly scattering media, such as biological tissue, is highly desirable but challenging. Recently, wavefront shaping technologies guided by ultrasonic encoding or photoacoustic sensing have been developed to address this limitation. So far, these methods provide only acoustic diffraction-limited optical focusing. Here, we introduce nonlinear photoacoustic wavefront shaping (PAWS), which achieves optical diffraction-limited (i.e. single-speckle-grain) focusing in scattering media. We develop an efficient dual-pulse excitation approach to generate strong nonlinear photoacoustic (PA) signals based on the Grueneisen memory effect. These nonlinear PA signals are used as feedback to guide iterative wavefront optimization. By maximizing the amplitude of the nonlinear PA signal, light is effectively focused to a single optical speckle grain. Experimental results demonstrate a clear optical focus on the scale of 5-7 micrometers, which is ~10 times smaller than the acoustic focus in linear dimension, with an enhancement factor of ~6000 in peak fluence. This technology has the potential to provide highly confined strong optical focus deep in tissue for microsurgery of Parkinson's disease and epilepsy or single-neuron imaging and optogenetic activation.
[ { "created": "Tue, 4 Feb 2014 18:14:00 GMT", "version": "v1" } ]
2014-02-05
[ [ "Lai", "Puxiang", "" ], [ "Wang", "Lidai", "" ], [ "Tay", "Jian Wei", "" ], [ "Wang", "Lihong V.", "" ] ]
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1402.0823
Gilles Cohen-Tannoudji S
Gilles Cohen-Tannoudji
An interpretive conjecture for physics beyond the standard models: generalized complementarity
Some typo corrections, extended abstract, references added
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gr-qc hep-th physics.hist-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Our interpretive conjecture is inspired by the epistemology due to Ferdinand Gonseth (1890-1975) who interpreted complementarity as the relationship between profound and apparent reality horizons. It consists, on the one hand, on enlarging the scope of quantum theory to the most profound reality horizon, namely a triply quantum theory of gravitation that would be able to take into account simultaneously as elementary quanta the Planck's constant, the Planck's space-time area and the Boltzmann constant, and, on the other hand, on interpreting in terms of generalized complementarity three doubly quantum schemata taking into account by pairs, these three elementary quanta and form the apparent reality horizon.
[ { "created": "Fri, 31 Jan 2014 09:33:06 GMT", "version": "v1" }, { "created": "Fri, 7 Feb 2014 11:05:07 GMT", "version": "v2" } ]
2016-12-30
[ [ "Cohen-Tannoudji", "Gilles", "" ] ]
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1402.0836
Sakyasingha Dasgupta
Sakyasingha Dasgupta
Cognitive Aging as Interplay between Hebbian Learning and Criticality
Concise version of MSc thesis, Neural Models of the Ageing Brain, University of Edinburgh, 2010. Supervisor Dr. J. Michael Herrmann. 64 pages, 20 figures
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null
null
nlin.AO cs.NE q-bio.NC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Cognitive ageing seems to be a story of global degradation. As one ages there are a number of physical, chemical and biological changes that take place. Therefore it is logical to assume that the brain is no exception to this phenomenon. The principle purpose of this project is to use models of neural dynamics and learning based on the underlying principle of self-organised criticality, to account for the age related cognitive effects. In this regard learning in neural networks can serve as a model for the acquisition of skills and knowledge in early development stages i.e. the ageing process and criticality in the network serves as the optimum state of cognitive abilities. Possible candidate mechanisms for ageing in a neural network are loss of connectivity and neurons, increase in the level of noise, reduction in white matter or more interestingly longer learning history and the competition among several optimization objectives. In this paper we are primarily interested in the affect of the longer learning history on memory and thus the optimality in the brain. Hence it is hypothesized that prolonged learning in the form of associative memory patterns can destroy the state of criticality in the network. We base our model on Tsodyks and Markrams [49] model of dynamic synapses, in the process to explore the effect of combining standard Hebbian learning with the phenomenon of Self-organised criticality. The project mainly consists of evaluations and simulations of networks of integrate and fire-neurons that have been subjected to various combinations of neural-level ageing effects, with the aim of establishing the primary hypothesis and understanding the decline of cognitive abilities due to ageing, using one of its important characteristics, a longer learning history.
[ { "created": "Tue, 4 Feb 2014 19:16:34 GMT", "version": "v1" } ]
2014-08-07
[ [ "Dasgupta", "Sakyasingha", "" ] ]
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1402.0842
Sina Zahedpour Anaraki
Sina Zahedpour, Jared Wahlstrand and Howard Milchberg
Quantum Control of Molecular Gas Hydrodynamics
5 pages, 4 figures
null
10.1103/PhysRevLett.112.143601
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We demonstrate that strong impulsive gas heating or heating suppression at standard temperature and pressure can occur from coherent rotational excitation or de-excitation of molecular gases using a sequence of non-ionizing laser pulses. For the case of excitation, subsequent collisional decoherence of the ensemble leads to gas heating significantly exceeding that from plasma absorption under the same laser focusing conditions. In both cases, the macroscopic hydrodynamics of the gas can be finely controlled with ~40 fs temporal sensitivity.
[ { "created": "Tue, 4 Feb 2014 19:42:14 GMT", "version": "v1" } ]
2015-06-18
[ [ "Zahedpour", "Sina", "" ], [ "Wahlstrand", "Jared", "" ], [ "Milchberg", "Howard", "" ] ]
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1402.0847
Hidemaro Suwa
Hidemaro Suwa and Synge Todo
Generalized Moment Method for Gap Estimation and Quantum Monte Carlo Level Spectroscopy
The main text has 5 pages with 3 figures, and the supplement material has 6 pages
null
10.1103/PhysRevLett.115.080601
null
cond-mat.stat-mech physics.comp-ph quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We formulate a convergent sequence for the energy gap estimation in the worldline quantum Monte Carlo method. The ambiguity left in the conventional gap calculation for quantum systems is eliminated. Our estimation will be unbiased in the low-temperature limit and also the error bar is reliably estimated. The level spectroscopy from quantum Monte Carlo data is developed as an application of the unbiased gap estimation. From the spectral analysis, we precisely determine the Kosterlitz-Thouless quantum phase-transition point of the spin-Peierls model. It is stablished that the quantum phonon with a finite frequency is essential to the critical theory governed by the antiadiabatic limit, i.e., the $k=1$ SU(2) Wess-Zumino-Witten model.
[ { "created": "Fri, 31 Jan 2014 19:32:20 GMT", "version": "v1" }, { "created": "Sat, 30 May 2015 07:51:25 GMT", "version": "v2" } ]
2015-09-02
[ [ "Suwa", "Hidemaro", "" ], [ "Todo", "Synge", "" ] ]
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1402.0851
Ren\'e van Bevern
Ren\'e van Bevern and Matthias Mnich and Rolf Niedermeier and Mathias Weller
Interval scheduling and colorful independent sets
This revision does not contain Theorem 7 of the first revision, whose proof contained an error
Journal of Scheduling 18(5):449-469, 2015
10.1007/s10951-014-0398-5
null
cs.DM cs.DS math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Numerous applications in scheduling, such as resource allocation or steel manufacturing, can be modeled using the NP-hard Independent Set problem (given an undirected graph and an integer k, find a set of at least k pairwise non-adjacent vertices). Here, one encounters special graph classes like 2-union graphs (edge-wise unions of two interval graphs) and strip graphs (edge-wise unions of an interval graph and a cluster graph), on which Independent Set remains NP-hard but admits constant-ratio approximations in polynomial time. We study the parameterized complexity of Independent Set on 2-union graphs and on subclasses like strip graphs. Our investigations significantly benefit from a new structural "compactness" parameter of interval graphs and novel problem formulations using vertex-colored interval graphs. Our main contributions are: 1. We show a complexity dichotomy: restricted to graph classes closed under induced subgraphs and disjoint unions, Independent Set is polynomial-time solvable if both input interval graphs are cluster graphs, and is NP-hard otherwise. 2. We chart the possibilities and limits of effective polynomial-time preprocessing (also known as kernelization). 3. We extend Halld\'orsson and Karlsson (2006)'s fixed-parameter algorithm for Independent Set on strip graphs parameterized by the structural parameter "maximum number of live jobs" to show that the problem (also known as Job Interval Selection) is fixed-parameter tractable with respect to the parameter k and generalize their algorithm from strip graphs to 2-union graphs. Preliminary experiments with random data indicate that Job Interval Selection with up to fifteen jobs and 5*10^5 intervals can be solved optimally in less than five minutes.
[ { "created": "Tue, 4 Feb 2014 20:13:32 GMT", "version": "v1" }, { "created": "Sat, 12 Jul 2014 16:51:09 GMT", "version": "v2" } ]
2016-01-12
[ [ "van Bevern", "René", "" ], [ "Mnich", "Matthias", "" ], [ "Niedermeier", "Rolf", "" ], [ "Weller", "Mathias", "" ] ]
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1402.0854
Joe Helmboldt
Joseph Helmboldt (Naval Research Laboratory) and Huib Intema (National Radio Astronomy Observatory)
Advanced spectral analysis of ionospheric waves observed with sparse arrays
accepted for publication in the Journal of Geophysical Research: Space Physics
null
10.1002/2013JA019162
null
physics.space-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper presents a case study from a single, six-hour observing period to illustrate the application of techniques developed for interferometric radio telescopes to the spectral analysis of observations of ionospheric fluctuations with sparse arrays. We have adapted the deconvolution methods used for making high dynamic range images of cosmic sources with radio arrays to making comparably high dynamic range maps of spectral power of wavelike ionospheric phenomena. In the example presented here, we have used observations of the total electron content (TEC) gradient derived from Very Large Array (VLA) observations of synchrotron emission from two galaxy clusters at 330 MHz as well as GPS-based TEC measurements from a sparse array of 33 receivers located within New Mexico near the VLA. We show that these techniques provide a significant improvement in signal to noise (S/N) of detected wavelike structures by correcting for both measurement inaccuracies and wavefront distortions. This is especially true for the GPS data when combining all available satellite/receiver pairs, which probe a larger physical area and likely have a wider variety of measurement errors than in the single-satellite case. In this instance, we found the peak S/N of the detected waves was improved by more than an order of magnitude. The data products generated by the deconvolution procedure also allow for a reconstruction of the fluctuations as a two-dimensional waveform/phase screen that can be used to correct for their effects.
[ { "created": "Tue, 4 Feb 2014 20:30:53 GMT", "version": "v1" } ]
2014-02-05
[ [ "Helmboldt", "Joseph", "", "Naval Research Laboratory" ], [ "Intema", "Huib", "", "National\n Radio Astronomy Observatory" ] ]
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1402.0856
Hong Huang
Hong Huang, Hussein Al-Azzawi, and Hajar Brani
Network Traffic Anomaly Detection
26 pages
null
null
null
cs.CR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper presents a tutorial for network anomaly detection, focusing on non-signature-based approaches. Network traffic anomalies are unusual and significant changes in the traffic of a network. Networks play an important role in today's social and economic infrastructures. The security of the network becomes crucial, and network traffic anomaly detection constitutes an important part of network security. In this paper, we present three major approaches to non-signature-based network detection: PCA-based, sketch-based, and signal-analysis-based. In addition, we introduce a framework that subsumes the three approaches and a scheme for network anomaly extraction. We believe network anomaly detection will become more important in the future because of the increasing importance of network security.
[ { "created": "Tue, 4 Feb 2014 20:38:34 GMT", "version": "v1" } ]
2014-02-05
[ [ "Huang", "Hong", "" ], [ "Al-Azzawi", "Hussein", "" ], [ "Brani", "Hajar", "" ] ]
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1402.0858
Peter Franek
Peter Franek, Marek Krcal
Robust Satisfiability of Systems of Equations
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null
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cs.CC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the problem of \emph{robust satisfiability} of systems of nonlinear equations, namely, whether for a given continuous function $f:\,K\to\mathbb{R}^n$ on a~finite simplicial complex $K$ and $\alpha>0$, it holds that each function $g:\,K\to\mathbb{R}^n$ such that $\|g-f\|_\infty \leq \alpha$, has a root in $K$. Via a reduction to the extension problem of maps into a sphere, we particularly show that this problem is decidable in polynomial time for every fixed $n$, assuming $\dim K \le 2n-3$. This is a substantial extension of previous computational applications of \emph{topological degree} and related concepts in numerical and interval analysis. Via a reverse reduction we prove that the problem is undecidable when $\dim K\ge 2n-2$, where the threshold comes from the \emph{stable range} in homotopy theory. For the lucidity of our exposition, we focus on the setting when $f$ is piecewise linear. Such functions can approximate general continuous functions, and thus we get approximation schemes and undecidability of the robust satisfiability in other possible settings.
[ { "created": "Tue, 4 Feb 2014 20:51:37 GMT", "version": "v1" } ]
2014-02-05
[ [ "Franek", "Peter", "" ], [ "Krcal", "Marek", "" ] ]
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1402.0859
Varun Jampani
Varun Jampani and Sebastian Nowozin and Matthew Loper and Peter V. Gehler
The Informed Sampler: A Discriminative Approach to Bayesian Inference in Generative Computer Vision Models
Appearing in Computer Vision and Image Understanding Journal (Special Issue on Generative Models in Computer Vision)
null
10.1016/j.cviu.2015.03.002
null
cs.CV cs.LG stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Computer vision is hard because of a large variability in lighting, shape, and texture; in addition the image signal is non-additive due to occlusion. Generative models promised to account for this variability by accurately modelling the image formation process as a function of latent variables with prior beliefs. Bayesian posterior inference could then, in principle, explain the observation. While intuitively appealing, generative models for computer vision have largely failed to deliver on that promise due to the difficulty of posterior inference. As a result the community has favoured efficient discriminative approaches. We still believe in the usefulness of generative models in computer vision, but argue that we need to leverage existing discriminative or even heuristic computer vision methods. We implement this idea in a principled way with an "informed sampler" and in careful experiments demonstrate it on challenging generative models which contain renderer programs as their components. We concentrate on the problem of inverting an existing graphics rendering engine, an approach that can be understood as "Inverse Graphics". The informed sampler, using simple discriminative proposals based on existing computer vision technology, achieves significant improvements of inference.
[ { "created": "Tue, 4 Feb 2014 20:52:26 GMT", "version": "v1" }, { "created": "Wed, 5 Feb 2014 11:28:13 GMT", "version": "v2" }, { "created": "Sat, 7 Mar 2015 19:50:59 GMT", "version": "v3" } ]
2015-03-10
[ [ "Jampani", "Varun", "" ], [ "Nowozin", "Sebastian", "" ], [ "Loper", "Matthew", "" ], [ "Gehler", "Peter V.", "" ] ]
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The Informed Sampler: A Discriminative Approach to Bayesian Inference in Generative Computer Vision Models
http://arxiv.org/abs/1402.0859v3
http://arxiv.org/pdf/1402.0859v3.pdf
https://github.com/mrquincle/noparama
false
false
https://paperswithcode.com/paper/the-informed-sampler-a-discriminative
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1402.0862
Francis Edward Su
Zeph Landau and Francis Edward Su
Fair Division and Redistricting
20 pages; to appear, Contemporary Mathematics
null
null
null
cs.GT math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Recently, Landau, Reid and Yershov provided a novel solution to the problem of redistricting. Instead of trying to ensure fairness by restricting the shape of the possible maps or by assigning the power to draw the map to nonbiased entities, the solution ensures fairness by balancing competing interests against each other. This kind of solution is an example of what are known as "fair division" solutions--- such solutions involve the preferences of all parties and are accompanied by rigorous guarantees of a specified well-defined notion of fairness. In this expository article, we give an introduction to the ideas of fair division in the context of this redistricting solution. Through examples and discussion we clarify how fair division methods can play an important role in a realistic redistricting solution by introducing an interactive step that incorporates a certain kind of fairness that can be used in concert with, and not a substitute for, other necessary or desired criteria for a good redistricting solution.
[ { "created": "Tue, 4 Feb 2014 20:56:37 GMT", "version": "v1" } ]
2014-02-05
[ [ "Landau", "Zeph", "" ], [ "Su", "Francis Edward", "" ] ]
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1402.0870
Yashar Akrami
Y. Akrami, Y. Fantaye, A. Shafieloo, H. K. Eriksen, F. K. Hansen, A. J. Banday, K. M. G\'orski
Power asymmetry in WMAP and Planck temperature sky maps as measured by a local variance estimator
7 pages, 3 figures; text added in response to referee's comments; matches version published in ApJL
Astrophys.J. 784 (2014) L42
10.1088/2041-8205/784/2/L42
null
astro-ph.CO physics.data-an
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We revisit the question of hemispherical power asymmetry in the WMAP and Planck temperature sky maps by measuring the local variance over the sky and on disks of various sizes. For the 2013 Planck sky map we find that none of the 1000 available isotropic Planck "Full Focal Plane" simulations have a larger variance asymmetry than that estimated from the data, suggesting the presence of an anisotropic signature formally significant at least at the $3.3\sigma$ level. For the WMAP 9-year data we find that 5 out of 1000 simulations have a larger asymmetry. The preferred direction for the asymmetry from the Planck data is $(l,b)=(212^\circ,-13^\circ)$, in good agreement with previous reports of the same hemispherical power asymmetry.
[ { "created": "Tue, 4 Feb 2014 21:00:16 GMT", "version": "v1" }, { "created": "Mon, 10 Feb 2014 15:49:18 GMT", "version": "v2" }, { "created": "Mon, 24 Mar 2014 13:45:23 GMT", "version": "v3" } ]
2014-03-25
[ [ "Akrami", "Y.", "" ], [ "Fantaye", "Y.", "" ], [ "Shafieloo", "A.", "" ], [ "Eriksen", "H. K.", "" ], [ "Hansen", "F. K.", "" ], [ "Banday", "A. J.", "" ], [ "Górski", "K. M.", "" ] ]
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1402.0886
Mohammad Mahmoodi Varnamkhasti
Maryam Mahmoodi, Mohammad Mahmoodi Varnamkhasti
A Secure Communication in Mobile Agent System
3 pages, Published with International Journal of Engineering Trends and Technology (IJETT)
International Journal of Engineering Trends and Technology (IJETT) V6(4):186-188, december 2013. Published by Seventh Sense Research Group
10.14445/22315381/IJETT-V6N4P133
null
cs.CR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A mobile agent is a software code with mobility which can be move from a computer into another computers through network. The mobile agent paradigm provides many benefits in developments of distributed application at the same time introduce new requirements for security issues with these systems. In this article we present a solution for protection agent from other agents attacks with loging patterns of malicious agent and useing this log for communication. We implemented our resolution by JADE.
[ { "created": "Tue, 4 Feb 2014 21:28:31 GMT", "version": "v1" } ]
2014-02-06
[ [ "Mahmoodi", "Maryam", "" ], [ "Varnamkhasti", "Mohammad Mahmoodi", "" ] ]
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1402.0894
Martin Lind\'en
Stephanie Johnson, Jan-Willem van de Meent, Rob Phillips, Chris H. Wiggins, and Martin Lind\'en
Multiple Lac-mediated loops revealed by Bayesian statistics and tethered particle motion
34 pages, 25 figures, including Supporting information. To appear in Nucleic Acids Research. Accompanying open-source software: http://sourceforge.net/projects/vbtpm/
Nucl. Acids Res. 42(16):10265-10277 (2014)
10.1093/nar/gku563
null
physics.bio-ph physics.data-an q-bio.BM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The bacterial transcription factor LacI loops DNA by binding to two separate locations on the DNA simultaneously. Despite being one of the best-studied model systems for transcriptional regulation, the number and conformations of loop structures accessible to LacI remain unclear, though the importance of multiple co-existing loops has been implicated in interactions between LacI and other cellular regulators of gene expression. To probe this issue, we have developed a new analysis method for tethered particle motion, a versatile and commonly-used in vitro single-molecule technique. Our method, vbTPM, performs variational Bayesian inference in hidden Markov models. It learns the number of distinct states (i.e., DNA-protein conformations) directly from tethered particle motion data with better resolution than existing methods, while easily correcting for common experimental artifacts. Studying short (roughly 100 bp) LacI-mediated loops, we provide evidence for three distinct loop structures, more than previously reported in single-molecule studies. Moreover, our results confirm that changes in LacI conformation and DNA binding topology both contribute to the repertoire of LacI-mediated loops formed in vitro, and provide qualitatively new input for models of looping and transcriptional regulation. We expect vbTPM to be broadly useful for probing complex protein-nucleic acid interactions.
[ { "created": "Tue, 4 Feb 2014 21:55:07 GMT", "version": "v1" }, { "created": "Wed, 18 Jun 2014 22:48:20 GMT", "version": "v2" } ]
2015-11-10
[ [ "Johnson", "Stephanie", "" ], [ "van de Meent", "Jan-Willem", "" ], [ "Phillips", "Rob", "" ], [ "Wiggins", "Chris H.", "" ], [ "Lindén", "Martin", "" ] ]
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1402.0897
Bartek Klin
Miko{\l}aj Boja\'nczyk (University of Warsaw), Bartek Klin (University of Warsaw), S{\l}awomir Lasota (University of Warsaw)
Automata theory in nominal sets
null
Logical Methods in Computer Science, Volume 10, Issue 3 (August 15, 2014) lmcs:1157
10.2168/LMCS-10(3:4)2014
null
cs.LO cs.FL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study languages over infinite alphabets equipped with some structure that can be tested by recognizing automata. We develop a framework for studying such alphabets and the ensuing automata theory, where the key role is played by an automorphism group of the alphabet. In the process, we generalize nominal sets due to Gabbay and Pitts.
[ { "created": "Tue, 4 Feb 2014 22:09:30 GMT", "version": "v1" }, { "created": "Thu, 14 Aug 2014 19:49:34 GMT", "version": "v2" } ]
2015-07-01
[ [ "Bojańczyk", "Mikołaj", "", "University of Warsaw" ], [ "Klin", "Bartek", "", "University\n of Warsaw" ], [ "Lasota", "Sławomir", "", "University of Warsaw" ] ]
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1402.0898
Rui Wu
Rui Wu, Vinod Prabhakaran, Pramod Viswanath and Yi Wang
Interference Channels with Half-Duplex Source Cooperation
final version submitted to IEEE Transaction on Information Theory
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null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The performance gain by allowing half-duplex source cooperation is studied for Gaussian interference channels. The source cooperation is {\em in-band}, meaning that each source can listen to the other source's transmission, but there is no independent (or orthogonal) channel between the sources. The half-duplex constraint supposes that at each time instant the sources can either transmit or listen, but not do both. Our main result is a characterization of the sum capacity when the cooperation is bidirectional and the channel gains are symmetric. With unidirectional cooperation, we essentially have a cognitive radio channel. By requiring the primary to achieve a rate close to its link capacity, the best possible rate for the secondary is characterized within a constant. Novel inner and outer bounds are derived as part of these characterizations.
[ { "created": "Tue, 4 Feb 2014 22:12:10 GMT", "version": "v1" } ]
2014-02-06
[ [ "Wu", "Rui", "" ], [ "Prabhakaran", "Vinod", "" ], [ "Viswanath", "Pramod", "" ], [ "Wang", "Yi", "" ] ]
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1402.0911
Rich Meier
Rich Meier, Eduardo Cotilla-Sanchez, Alan Fern
A Policy Switching Approach to Consolidating Load Shedding and Islanding Protection Schemes
Full Paper Accepted to PSCC 2014 - IEEE Co-Sponsored Conference. 7 Pages, 2 Figures, 2 Tables
null
10.1109/PSCC.2014.7038306
null
cs.SY physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In recent years there have been many improvements in the reliability of critical infrastructure systems. Despite these improvements, the power systems industry has seen relatively small advances in this regard. For instance, power quality deficiencies, a high number of localized contingencies, and large cascading outages are still too widespread. Though progress has been made in improving generation, transmission, and distribution infrastructure, remedial action schemes (RAS) remain non-standardized and are often not uniformly implemented across different utilities, ISOs, and RTOs. Traditionally, load shedding and islanding have been successful protection measures in restraining propagation of contingencies and large cascading outages. This paper proposes a novel, algorithmic approach to selecting RAS policies to optimize the operation of the power network during and after a contingency. Specifically, we use policy-switching to consolidate traditional load shedding and islanding schemes. In order to model and simulate the functionality of the proposed power systems protection algorithm, we conduct Monte-Carlo, time-domain simulations using Siemens PSS/E. The algorithm is tested via experiments on the IEEE-39 topology to demonstrate that the proposed approach achieves optimal power system performance during emergency situations, given a specific set of RAS policies.
[ { "created": "Tue, 4 Feb 2014 23:21:42 GMT", "version": "v1" }, { "created": "Sat, 9 Aug 2014 19:02:11 GMT", "version": "v2" } ]
2016-11-17
[ [ "Meier", "Rich", "" ], [ "Cotilla-Sanchez", "Eduardo", "" ], [ "Fern", "Alan", "" ] ]
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1402.0912
Hiroyuki Shima
Akifumi Kijima, Keiko Yokoyama, Hiroyuki Shima, Yuji Yamamoto
Emergence of self-similarity in football dynamics
Figures 1 and 2 are blurred due to file-size restriction. Sharply-defined images can be viewed in the final version published by European Physical Journal B
European Physical Journal B 87 (2014) 41
10.1140/epjb/e2014-40987-5
null
physics.pop-ph nlin.AO physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The multiplayer dynamics of a football game is analyzed to unveil self-similarities in the time evolution of player and ball positioning. Temporal fluctuations in both the team-turf boundary and the ball location are uncovered to follow the rules of fractional Brownian motion with a Hurst exponent of H=0.7. The persistence time below which self-similarity holds is found to be several tens of seconds, implying a characteristic time scale that governs far-from-equilibrium motion on a playing field.
[ { "created": "Tue, 4 Feb 2014 23:37:29 GMT", "version": "v1" }, { "created": "Wed, 19 Feb 2014 08:38:01 GMT", "version": "v2" } ]
2014-02-20
[ [ "Kijima", "Akifumi", "" ], [ "Yokoyama", "Keiko", "" ], [ "Shima", "Hiroyuki", "" ], [ "Yamamoto", "Yuji", "" ] ]
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1402.0914
Scott Linderman
Scott W. Linderman and Ryan P. Adams
Discovering Latent Network Structure in Point Process Data
null
null
null
null
stat.ML cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Networks play a central role in modern data analysis, enabling us to reason about systems by studying the relationships between their parts. Most often in network analysis, the edges are given. However, in many systems it is difficult or impossible to measure the network directly. Examples of latent networks include economic interactions linking financial instruments and patterns of reciprocity in gang violence. In these cases, we are limited to noisy observations of events associated with each node. To enable analysis of these implicit networks, we develop a probabilistic model that combines mutually-exciting point processes with random graph models. We show how the Poisson superposition principle enables an elegant auxiliary variable formulation and a fully-Bayesian, parallel inference algorithm. We evaluate this new model empirically on several datasets.
[ { "created": "Tue, 4 Feb 2014 23:48:23 GMT", "version": "v1" } ]
2014-02-06
[ [ "Linderman", "Scott W.", "" ], [ "Adams", "Ryan P.", "" ] ]
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1402.0915
Oren Rippel
Oren Rippel, Michael A. Gelbart, Ryan P. Adams
Learning Ordered Representations with Nested Dropout
11 pages, 5 figures. Submitted for publication
null
null
null
stat.ML cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we study ordered representations of data in which different dimensions have different degrees of importance. To learn these representations we introduce nested dropout, a procedure for stochastically removing coherent nested sets of hidden units in a neural network. We first present a sequence of theoretical results in the simple case of a semi-linear autoencoder. We rigorously show that the application of nested dropout enforces identifiability of the units, which leads to an exact equivalence with PCA. We then extend the algorithm to deep models and demonstrate the relevance of ordered representations to a number of applications. Specifically, we use the ordered property of the learned codes to construct hash-based data structures that permit very fast retrieval, achieving retrieval in time logarithmic in the database size and independent of the dimensionality of the representation. This allows codes that are hundreds of times longer than currently feasible for retrieval. We therefore avoid the diminished quality associated with short codes, while still performing retrieval that is competitive in speed with existing methods. We also show that ordered representations are a promising way to learn adaptive compression for efficient online data reconstruction.
[ { "created": "Wed, 5 Feb 2014 00:41:58 GMT", "version": "v1" } ]
2014-02-06
[ [ "Rippel", "Oren", "" ], [ "Gelbart", "Michael A.", "" ], [ "Adams", "Ryan P.", "" ] ]
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Learning Ordered Representations with Nested Dropout
http://arxiv.org/abs/1402.0915v1
http://arxiv.org/pdf/1402.0915v1.pdf
https://github.com/PhilippeNguyen/nested_dropout
false
false
https://paperswithcode.com/paper/learning-ordered-representations-with-nested
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1402.0916
Itzhak Tamo
Itzhak Tamo and Alexander Barg
Bounds on Locally Recoverable Codes with Multiple Recovering Sets
Submitted to ISIT 2014
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cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A locally recoverable code (LRC code) is a code over a finite alphabet such that every symbol in the encoding is a function of a small number of other symbols that form a recovering set. Bounds on the rate and distance of such codes have been extensively studied in the literature. In this paper we derive upper bounds on the rate and distance of codes in which every symbol has $t\geq 1$ disjoint recovering sets.
[ { "created": "Wed, 5 Feb 2014 00:46:04 GMT", "version": "v1" } ]
2014-02-06
[ [ "Tamo", "Itzhak", "" ], [ "Barg", "Alexander", "" ] ]
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1402.0918
Usman Khan
Mohammadreza Doostmohammadian and Usman A. Khan
Graphic-theoretic distributed inference in social networks
submitted for journal publication
null
10.1109/JSTSP.2014.2314512
null
cs.SI cs.MA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider distributed inference in social networks where a phenomenon of interest evolves over a given social interaction graph, referred to as the \emph{social digraph}. For inference, we assume that a network of agents monitors certain nodes in the social digraph and no agent may be able to perform inference within its neighborhood; the agents must rely on inter-agent communication. The key contributions of this paper include: (i) a novel construction of the distributed estimator and distributed observability from the first principles; (ii) a graph-theoretic agent classification that establishes the importance and role of each agent towards inference; (iii) characterizing the necessary conditions, based on the classification in (ii), on the agent network to achieve distributed observability. Our results are based on structured systems theory and are applicable to any parameter choice of the underlying system matrix as long as the social digraph remains fixed. In other words, any social phenomena that evolves (linearly) over a structure-invariant social digraph may be considered--we refer to such systems as Liner Structure-Invariant (LSI). The aforementioned contributions, (i)--(iii), thus, only require the knowledge of the social digraph (topology) and are independent of the social phenomena. We show the applicability of the results to several real-wold social networks, i.e. social influence among monks, networks of political blogs and books, and a co-authorship graph.
[ { "created": "Wed, 5 Feb 2014 01:04:09 GMT", "version": "v1" } ]
2015-06-18
[ [ "Doostmohammadian", "Mohammadreza", "" ], [ "Khan", "Usman A.", "" ] ]
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1402.0921
Shafi'i Muhammad Abdulhamid Mr
Olawale Adebayo, Shafii Muhammad Abdulhamid
E- Exams System for Nigerian Universities with Emphasis on Security and Result Integrity
12 pages, 3 figures, 1 table. arXiv admin note: text overlap with arXiv:1202.3466, arXiv:1202.2516 by other authors
International Journal of the Computer, the Internet and Management (IJCIM), Volume 18, Number 2, 2010
null
ISSN 0858-7027
cs.CY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The recent employment and eventual widespread acceptance of electronic test in examining students and various classes in Nigeria has created a significant impact in the trends of educational history in the country. In this paper, we examined the impacts, associated challenges and security lapses of the existing electronic-examination system with the aim of ameliorating and developing a new acceptable e-Exam system that takes care of the existing systems challenges and security lapses. Six Universities that are already conducting e- Examination were selected across the country for this research work. Twenty students that participated in the e-exams and five members of staff were selected for interview and questionnaire. Based on the analysis of the interviews and study of the existing electronic examination system, some anomalies were discovered and a new e-exams system was developed to eradicate these anomalies. The new system uses data encryption in order to protect the questions sent to the e-Examination center through the internet or intranet and a biometric fingerprint authentication to screen the stakeholders.
[ { "created": "Wed, 5 Feb 2014 01:43:43 GMT", "version": "v1" } ]
2014-02-06
[ [ "Adebayo", "Olawale", "" ], [ "Abdulhamid", "Shafii Muhammad", "" ] ]
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null
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1402.0922
Ke Han
CUORE Collaboration: D. R. Artusa, F. T. Avignone III, O. Azzolini, M. Balata, T. I. Banks, G. Bari, J. Beeman, F. Bellini, A. Bersani, M. Biassoni, C. Brofferio, C. Bucci, X. Z. Cai, L. Canonica, X. G. Cao, S. Capelli, L. Carbone, L. Cardani, M. Carrettoni, N. Casali, D. Chiesa, N. Chott, M. Clemenza, C. Cosmelli, O. Cremonesi, R. J. Creswick, I. Dafinei, A. Dally, V. Datskov, M. M. Deninno, S. Di Domizio, M. L. di Vacri, L. Ejzak, D. Q. Fang, H. A. Farach, M. Faverzani, G. Fernandes, E. Ferri, F. Ferroni, E. Fiorini, S. J. Freedman, B. K. Fujikawa, A. Giachero, L. Gironi, A. Giuliani, J. Goett, P. Gorla, C. Gotti, T. D. Gutierrez, E. E. Haller, K. Han, K. M. Heeger, R. Hennings-Yeomans, H. Z. Huang, R. Kadel, K. Kazkaz, G. Keppel, Yu. G. Kolomensky, Y. L. Li, K. E. Lim, X. Liu, Y. G. Ma, C. Maiano, M. Maino, M. Martinez, R. H. Maruyama, Y. Mei, N. Moggi, S. Morganti, S. Nisi, C. Nones, E. B. Norman, A. Nucciotti, T. O'Donnell, F. Orio, D. Orlandi, J. L. Ouellet, M. Pallavicini, V. Palmieri, L. Pattavina, M. Pavan, M. Pedretti, G. Pessina, V. Pettinacci, G. Piperno, S. Pirro, E. Previtali, C. Rosenfeld, C. Rusconi, E. Sala, S. Sangiorgio, N. D. Scielzo, M. Sisti, A. R. Smith, L. Taffarello, M. Tenconi, F. Terranova, W. D. Tian, C. Tomei, S. Trentalange, G. Ventura, M. Vignati, B. S. Wang, H. W. Wang, L. Wielgus, J. Wilson, L. A. Winslow, T. Wise, L. Zanotti, C. Zarra, B. X. Zhu, S. Zucchelli
Initial performance of the CUORE-0 experiment
8 pages, 5 figures, version 2 as published in Eur. Phys. J. C
Eur. Phys. J. C 74, 2956 (2014)
10.1140/epjc/s10052-014-2956-6
null
physics.ins-det hep-ex nucl-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
CUORE-0 is a cryogenic detector that uses an array of tellurium dioxide bolometers to search for neutrinoless double-beta decay of ^{130}Te. We present the first data analysis with 7.1 kg y of total TeO_2 exposure focusing on background measurements and energy resolution. The background rates in the neutrinoless double-beta decay region of interest (2.47 to 2.57 MeV) and in the {\alpha} background-dominated region (2.70 to 3.90 MeV) have been measured to be 0.071 \pm 0.011 and 0.019 \pm 0.002 counts/keV/kg/y, respectively. The latter result represents a factor of 6 improvement from a predecessor experiment, Cuoricino. The results verify our understanding of the background sources in CUORE-0, which is the basis of extrapolations to the full CUORE detector. The obtained energy resolution (full width at half maximum) in the region of interest is 5.7 keV. Based on the measured background rate and energy resolution in the region of interest, CUORE-0 half-life sensitivity is expected to surpass the observed lower bound of Cuoricino with one year of live time.
[ { "created": "Wed, 5 Feb 2014 02:22:46 GMT", "version": "v1" }, { "created": "Fri, 1 Aug 2014 00:56:02 GMT", "version": "v2" } ]
2014-08-04
[ [ "CUORE Collaboration", "", "" ], [ "Artusa", "D. R.", "" ], [ "Avignone", "F. T.", "III" ], [ "Azzolini", "O.", "" ], [ "Balata", "M.", "" ], [ "Banks", "T. I.", "" ], [ "Bari", "G.", "" ], [ "Beeman", "J.", "" ], [ "Bellini", "F.", "" ], [ "Bersani", "A.", "" ], [ "Biassoni", "M.", "" ], [ "Brofferio", "C.", "" ], [ "Bucci", "C.", "" ], [ "Cai", "X. Z.", "" ], [ "Canonica", "L.", "" ], [ "Cao", "X. G.", "" ], [ "Capelli", "S.", "" ], [ "Carbone", "L.", "" ], [ "Cardani", "L.", "" ], [ "Carrettoni", "M.", "" ], [ "Casali", "N.", "" ], [ "Chiesa", "D.", "" ], [ "Chott", "N.", "" ], [ "Clemenza", "M.", "" ], [ "Cosmelli", "C.", "" ], [ "Cremonesi", "O.", "" ], [ "Creswick", "R. J.", "" ], [ "Dafinei", "I.", "" ], [ "Dally", "A.", "" ], [ "Datskov", "V.", "" ], [ "Deninno", "M. M.", "" ], [ "Di Domizio", "S.", "" ], [ "di Vacri", "M. L.", "" ], [ "Ejzak", "L.", "" ], [ "Fang", "D. Q.", "" ], [ "Farach", "H. A.", "" ], [ "Faverzani", "M.", "" ], [ "Fernandes", "G.", "" ], [ "Ferri", "E.", "" ], [ "Ferroni", "F.", "" ], [ "Fiorini", "E.", "" ], [ "Freedman", "S. J.", "" ], [ "Fujikawa", "B. K.", "" ], [ "Giachero", "A.", "" ], [ "Gironi", "L.", "" ], [ "Giuliani", "A.", "" ], [ "Goett", "J.", "" ], [ "Gorla", "P.", "" ], [ "Gotti", "C.", "" ], [ "Gutierrez", "T. D.", "" ], [ "Haller", "E. E.", "" ], [ "Han", "K.", "" ], [ "Heeger", "K. M.", "" ], [ "Hennings-Yeomans", "R.", "" ], [ "Huang", "H. Z.", "" ], [ "Kadel", "R.", "" ], [ "Kazkaz", "K.", "" ], [ "Keppel", "G.", "" ], [ "Kolomensky", "Yu. G.", "" ], [ "Li", "Y. L.", "" ], [ "Lim", "K. E.", "" ], [ "Liu", "X.", "" ], [ "Ma", "Y. G.", "" ], [ "Maiano", "C.", "" ], [ "Maino", "M.", "" ], [ "Martinez", "M.", "" ], [ "Maruyama", "R. H.", "" ], [ "Mei", "Y.", "" ], [ "Moggi", "N.", "" ], [ "Morganti", "S.", "" ], [ "Nisi", "S.", "" ], [ "Nones", "C.", "" ], [ "Norman", "E. B.", "" ], [ "Nucciotti", "A.", "" ], [ "O'Donnell", "T.", "" ], [ "Orio", "F.", "" ], [ "Orlandi", "D.", "" ], [ "Ouellet", "J. L.", "" ], [ "Pallavicini", "M.", "" ], [ "Palmieri", "V.", "" ], [ "Pattavina", "L.", "" ], [ "Pavan", "M.", "" ], [ "Pedretti", "M.", "" ], [ "Pessina", "G.", "" ], [ "Pettinacci", "V.", "" ], [ "Piperno", "G.", "" ], [ "Pirro", "S.", "" ], [ "Previtali", "E.", "" ], [ "Rosenfeld", "C.", "" ], [ "Rusconi", "C.", "" ], [ "Sala", "E.", "" ], [ "Sangiorgio", "S.", "" ], [ "Scielzo", "N. D.", "" ], [ "Sisti", "M.", "" ], [ "Smith", "A. R.", "" ], [ "Taffarello", "L.", "" ], [ "Tenconi", "M.", "" ], [ "Terranova", "F.", "" ], [ "Tian", "W. D.", "" ], [ "Tomei", "C.", "" ], [ "Trentalange", "S.", "" ], [ "Ventura", "G.", "" ], [ "Vignati", "M.", "" ], [ "Wang", "B. S.", "" ], [ "Wang", "H. W.", "" ], [ "Wielgus", "L.", "" ], [ "Wilson", "J.", "" ], [ "Winslow", "L. A.", "" ], [ "Wise", "T.", "" ], [ "Zanotti", "L.", "" ], [ "Zarra", "C.", "" ], [ "Zhu", "B. X.", "" ], [ "Zucchelli", "S.", "" ] ]
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1402.0925
Nicolas Limal
Nicolas Limal
An Information Identity for State-dependent Channels with Feedback
7 pages
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this technical note, we investigate information quantities of state-dependent communication channels with corrupted information fed back from the receiver. We derive an information identity which can be interpreted as a law of conservation of information flows.
[ { "created": "Wed, 5 Feb 2014 03:21:22 GMT", "version": "v1" } ]
2014-02-06
[ [ "Limal", "Nicolas", "" ] ]
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1402.0927
Alexei Dmitriev V.
A.V. Dmitriev, A. V. Suvorova, J.-K. Chao, C. B. Wang, L. Rastaetter, M. I. Panasyuk, L. L. Lazutin, A. S. Kovtyukh, I. S. Veselovsky, I. N. Myagkova
Anomalous dynamics of the extremely compressed magnetosphere during 21 January 2005 magnetic storm
Keywords: erupting filament, geomagnetic storm, magnetosphere boundary layers, ring current decay. J. Geophys. Res
null
10.1002/2013JA019534
null
physics.space-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Dynamics of the dayside magnetosphere and proton radiation belt was analyzed during unusual magnetic storm on 21 January 2005. We have found that during the storm from 1712 to 2400 UT, the subsolar magnetopause was continuously located inside geosynchronous orbit due to strong compression. The compression was found to be extremely strong from 1846 to 2035 UT when the dense plasma of fast erupting filament produced the solar wind dynamic pressure Pd peaked up to >100 nPa and, in the first time, the upstream solar wind was observed at geosynchronous orbit during almost 2 hours. Under the extreme compression, the outer magnetosphere at L > 5 was pushed inward and the outer radiation belt particles with energies of several tens of keV moved earthward, became adiabatically accelerated and accumulated in the inner magnetosphere at L < 4 that produced the intensified ring current with an exceptionally long lifetime. The observations were compared with predictions of various empirical and first principles models. All the models failed to predict the magnetospheric dynamics under the extreme compression when the minimal magnetopause distance was estimated to be ~3 Re. The inconsistencies between the model predictions and observations might result from distortions of plasma measurements by extreme heliospheric conditions consisting in very fast solar wind streams (~1000 km/s) and intense fluxes of solar energetic particles. We speculated that anomalous dynamics of the magnetosphere could be well described by the models if the He abundance in the solar wind was assumed to be >20%, which is well appropriate for erupting filaments and which is in agreement with the upper 27% threshold for the He/H ratio obtained from Cluster measurements.
[ { "created": "Wed, 5 Feb 2014 03:33:26 GMT", "version": "v1" } ]
2014-02-06
[ [ "Dmitriev", "A. V.", "" ], [ "Suvorova", "A. V.", "" ], [ "Chao", "J. -K.", "" ], [ "Wang", "C. B.", "" ], [ "Rastaetter", "L.", "" ], [ "Panasyuk", "M. I.", "" ], [ "Lazutin", "L. L.", "" ], [ "Kovtyukh", "A. S.", "" ], [ "Veselovsky", "I. S.", "" ], [ "Myagkova", "I. N.", "" ] ]
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1402.0928
Scott Ainsworth
Scott G. Ainsworth and Michael L. Nelson and Herbert Van de Sompel
A Framework for Evaluation of Composite Memento Temporal Coherence
10 pages, 12 figures, 6 tables. Version 3 corrects predicates 13, 14, 16, 17, 19, and 20
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cs.DL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Most archived HTML pages embed other web resources, such as images and stylesheets. Playback of the archived web pages typically provides only the capture date (or Memento-Datetime) of the root resource and not the Memento-Datetime of the embedded resources. In the course of our research, we have discovered that the Memento-Datetime of embedded resources can be up to several years in the future or past, relative to the Memento-Datetime of the embedding root resource. We introduce a framework for assessing temporal coherence between a root resource and its embedded resource depending on Memento-Datetime, Last-Modified datetime, and entity body.
[ { "created": "Wed, 5 Feb 2014 03:50:33 GMT", "version": "v1" }, { "created": "Fri, 7 Feb 2014 00:01:00 GMT", "version": "v2" }, { "created": "Sun, 5 Oct 2014 23:08:30 GMT", "version": "v3" } ]
2014-10-07
[ [ "Ainsworth", "Scott G.", "" ], [ "Nelson", "Michael L.", "" ], [ "Van de Sompel", "Herbert", "" ] ]
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A Framework for Evaluation of Composite Memento Temporal Coherence
http://arxiv.org/abs/1402.0928v3
http://arxiv.org/pdf/1402.0928v3.pdf
https://github.com/mementoweb/mediawiki
false
false
https://paperswithcode.com/paper/a-framework-for-evaluation-of-composite
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1402.0929
Jasper Snoek
Jasper Snoek, Kevin Swersky, Richard S. Zemel and Ryan P. Adams
Input Warping for Bayesian Optimization of Non-stationary Functions
null
null
null
null
stat.ML cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Bayesian optimization has proven to be a highly effective methodology for the global optimization of unknown, expensive and multimodal functions. The ability to accurately model distributions over functions is critical to the effectiveness of Bayesian optimization. Although Gaussian processes provide a flexible prior over functions which can be queried efficiently, there are various classes of functions that remain difficult to model. One of the most frequently occurring of these is the class of non-stationary functions. The optimization of the hyperparameters of machine learning algorithms is a problem domain in which parameters are often manually transformed a priori, for example by optimizing in "log-space," to mitigate the effects of spatially-varying length scale. We develop a methodology for automatically learning a wide family of bijective transformations or warpings of the input space using the Beta cumulative distribution function. We further extend the warping framework to multi-task Bayesian optimization so that multiple tasks can be warped into a jointly stationary space. On a set of challenging benchmark optimization tasks, we observe that the inclusion of warping greatly improves on the state-of-the-art, producing better results faster and more reliably.
[ { "created": "Wed, 5 Feb 2014 03:55:39 GMT", "version": "v1" }, { "created": "Thu, 20 Feb 2014 22:00:38 GMT", "version": "v2" }, { "created": "Wed, 11 Jun 2014 20:32:11 GMT", "version": "v3" } ]
2014-06-13
[ [ "Snoek", "Jasper", "" ], [ "Swersky", "Kevin", "" ], [ "Zemel", "Richard S.", "" ], [ "Adams", "Ryan P.", "" ] ]
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Input Warping for Bayesian Optimization of Non-stationary Functions
http://arxiv.org/abs/1402.0929v3
http://arxiv.org/pdf/1402.0929v3.pdf
https://github.com/HIPS/Spearmint
false
false
https://paperswithcode.com/paper/input-warping-for-bayesian-optimization-of
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1402.0932
Ali Rakhshan
Ali Rakhshan, Hossein Pishro-Nik, Donald L. Fisher, Mohammad Nekoui
Tuning Collision Warning Algorithms to Individual Drivers for Design of Active Safety Systems
A major reason: Since now CV2X has considerable advantages over 802.11p and it can be the next specification used for V2X communication, I'd like to withdraw this paper in order to make it easier for the readers to find the best papers in the area. See: https://www.qualcomm.com/news/onq/2018/04/25/lets-set-record-straight-c-v2x
null
null
null
cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Every year, many people are killed and injured in highway traffic accidents. In order to reduce such casualties, collisions warning systems has been studied extensively. These systems are built by taking the driver reaction times into account. However, most of the existing literature focuses on characterizing how driver reaction times vary across an entire population. Therefore, many of the warnings that are given turn out to be false alarms. A false alarm occurs whenever a warning is sent, but it is not needed. This would nagate any safety benefit of the system, and could even reduce the overall safety if warnings become a distraction. In this paper, we propose our solution to address the described problem; First, we briefly describe our method for estimating the distribution of brake response times for a particular driver using data from a Vehicular Ad-Hoc Network (VANET) system. Then, we investigate how brake response times of individual drivers can be used in collision warning algorithms to reduce false alarm rates while still maintaining a high level of safety. This will yield a system that is overall more reliable and trustworthy for drivers, which could lead to wider adoption and applicability for V2V/V2I communication systems. Moreover, we show how false alarm rate varies with respect to probability of accident. Our simulation results show that by individualizing collision warnings the number of false alarms can be reduced more than $50\%$. Then, we conclude safety applications could potentially take full advantage of being customized to an individual's characteristics.
[ { "created": "Wed, 5 Feb 2014 04:19:03 GMT", "version": "v1" }, { "created": "Sat, 2 Mar 2019 00:32:05 GMT", "version": "v2" } ]
2019-03-05
[ [ "Rakhshan", "Ali", "" ], [ "Pishro-Nik", "Hossein", "" ], [ "Fisher", "Donald L.", "" ], [ "Nekoui", "Mohammad", "" ] ]
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1402.0933
Eric Blackman
Eric G. Blackman (U. Rochester)
Magnetic Helicity and Large Scale Magnetic Fields: A Primer
32 pages, 18 figures (many with multiple panels); this version updated with a number of small corrections made in the proofs preparation stage; in press by Space Science Reviews and to eventually appear in associated ISSI book volume on "Multiscale Structure Formation and Dynamics in Cosmic Plasmas"; A. Balogh, Editor
null
10.1007/s11214-014-0038-6
null
astro-ph.SR astro-ph.GA astro-ph.HE physics.plasm-ph physics.space-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Magnetic fields of laboratory, planetary, stellar, and galactic plasmas commonly exhibit significant order on large temporal or spatial scales compared to the otherwise random motions within the hosting system. Such ordered fields can be measured in the case of planets, stars, and galaxies, or inferred indirectly by the action of their dynamical influence, such as jets. Whether large scale fields are amplified in situ or a remnant from previous stages of an object's history is often debated for objects without a definitive magnetic activity cycle. Magnetic helicity, a measure of twist and linkage of magnetic field lines, is a unifying tool for understanding large scale field evolution for both mechanisms of origin. Its importance stems from its two basic properties: (1) magnetic helicity is typically better conserved than magnetic energy; and (2) the magnetic energy associated with a fixed amount of magnetic helicity is minimized when the system relaxes this helical structure to the largest scale available. Here I discuss how magnetic helicity has come to help us understand the saturation of and sustenance of large scale dynamos, the need for either local or global helicity fluxes to avoid dynamo quenching, and the associated observational consequences. I also discuss how magnetic helicity acts as a hindrance to turbulent diffusion of large scale fields, and thus a helper for fossil remnant large scale field origin models in some contexts. I briefly discuss the connection between large scale fields and accretion disk theory as well. The goal here is to provide a conceptual primer to help the reader efficiently penetrate the literature.
[ { "created": "Wed, 5 Feb 2014 04:38:16 GMT", "version": "v1" }, { "created": "Mon, 17 Mar 2014 06:22:37 GMT", "version": "v2" } ]
2015-06-18
[ [ "Blackman", "Eric G.", "", "U. Rochester" ] ]
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1402.0936
Ahmadreza Baghaie
Ahmadreza Baghaie, Zeyun Yu
An Optimization Method For Slice Interpolation Of Medical Images
4 pages, 5 figures
null
null
null
cs.CV cs.CE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Slice interpolation is a fast growing field in medical image processing. Intensity-based interpolation and object-based interpolation are two major groups of methods in the literature. In this paper, we describe an object-oriented, optimization method based on a modified version of curvature-based image registration, in which a displacement field is computed for the missing slice between two known slices and used to interpolate the intensities of the missing slice. The proposed approach is evaluated quantitatively by using the Mean Squared Difference (MSD) as a metric. The produced results also show visual improvement in preserving sharp edges in images.
[ { "created": "Wed, 5 Feb 2014 05:31:59 GMT", "version": "v1" }, { "created": "Thu, 27 Mar 2014 07:12:28 GMT", "version": "v2" } ]
2014-03-28
[ [ "Baghaie", "Ahmadreza", "" ], [ "Yu", "Zeyun", "" ] ]
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1402.0939
Robert Pfeifer
Robert N. C. Pfeifer and Glen Evenbly and Sukhwinder Singh and Guifre Vidal
NCON: A tensor network contractor for MATLAB
7 pages, 3 figures, RevTeX 4.1. Contains downloadable software v1.01. Amended download instructions to note that when clicking to download the source in .tar.gz format, arXiv actually supplies it in uncompressed .tar format. Substantial text overlap with arXiv:1310.8023: We use many of the same examples to describe the operation of ncon() as we do for the complementary package multienv()
null
null
null
physics.comp-ph cond-mat.str-el quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A fundamental process in the implementation of any numerical tensor network algorithm is that of contracting a tensor network. In this process, a network made up of multiple tensors connected by summed indices is reduced to a single tensor or a number by evaluating the index sums. This article presents a MATLAB function ncon(), or "Network CONtractor", which accepts as its input a tensor network and a contraction sequence describing how this network may be reduced to a single tensor or number. As its output it returns that single tensor or number. The function ncon() may be obtained by downloading the source of this preprint.
[ { "created": "Wed, 5 Feb 2014 05:42:17 GMT", "version": "v1" }, { "created": "Thu, 6 Mar 2014 21:56:27 GMT", "version": "v2" }, { "created": "Tue, 25 Aug 2015 04:46:33 GMT", "version": "v3" } ]
2015-08-26
[ [ "Pfeifer", "Robert N. C.", "" ], [ "Evenbly", "Glen", "" ], [ "Singh", "Sukhwinder", "" ], [ "Vidal", "Guifre", "" ] ]
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NCON: A tensor network contractor for MATLAB
http://arxiv.org/abs/1402.0939v3
http://arxiv.org/pdf/1402.0939v3.pdf
https://github.com/mhauru/ncon
false
false
https://paperswithcode.com/paper/ncon-a-tensor-network-contractor-for-matlab
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1402.0945
Seyed Gholamreza Eslami
Seyed Gholamreza Eslami, Ali Peiravi, Behzad Molavi
A Survey on Factors Affecting Iran's Fuel Rationing Smart Card User Acceptance and Security
5 pages, 1 figure, 5 tables
null
null
null
cs.CY
http://creativecommons.org/licenses/by/3.0/
Smart card technology has resulted in vast developments in many aspects of modern human life. User acceptance of fuel rationing smart cards based on adoption model involves many factors such as: satisfaction, security, external variables, attitude toward using, etc. In this study, user acceptance and security factors for fuel rationing smart cards in Iran have been evaluated based on an adoption model by distributing a questionnaire among UTM (University Technology Malaysia) Iranian students, MMU (Multimedia University) Iranian students, either asking by e-mail from people who are not available.
[ { "created": "Wed, 5 Feb 2014 06:11:15 GMT", "version": "v1" } ]
2014-02-06
[ [ "Eslami", "Seyed Gholamreza", "" ], [ "Peiravi", "Ali", "" ], [ "Molavi", "Behzad", "" ] ]
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1402.0951
Daniela Mugnai
Daniela Mugnai
The generation of concentrated energy of Bessel beams in an array of concentric rings
null
Optics Commun. vol. 294 (2013)p. 17-20
10.1016/j.optcom.2012.11.089
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In recent years, the problem of the production of localized waves has been analyzed in various ways, from both a theoretical and a practical point of view. We present here a way in which to construct a suitable experimental set-up, so as to obtain highly localized energy. On the basis of a vectorial treatment already studied for a specific source (namely, a ring-shaped aperture over a metallic screen), we evaluate the amount of energy supplied by a single Bessel beam. Then, by analyzing the geometric characteristics of the experimental set-up, we can establish the position of further rings, so as to increase the localized energy to a maximum.
[ { "created": "Wed, 5 Feb 2014 07:10:23 GMT", "version": "v1" }, { "created": "Thu, 6 Feb 2014 07:16:49 GMT", "version": "v2" } ]
2015-06-18
[ [ "Mugnai", "Daniela", "" ] ]
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1402.0955
Xifeng Ren
Yong-Jing Cai, Ming Li, Xi-Feng Ren, Chang-Ling Zou, Xiao Xiong, Hua-Lin Lei, Bi-Heng Liu, Guo-Ping Guo, and Guang-Can Guo
High visibility on-chip quantum interference of single surface plasmons
6 pages, 4 figures
Physical Review APPLIED 2, 014004 (2014)
10.1103/PhysRevApplied.2.014004
null
quant-ph physics.optics
http://creativecommons.org/licenses/by/3.0/
Quantum photonic integrated circuits (QPICs) based on dielectric waveguides have been widely used in linear optical quantum computation. Recently, surface plasmons have been introduced to this application because they can confine and manipulate light beyond the diffraction limit. In this study, the on-chip quantum interference of two single surface plasmons was achieved using dielectric-loaded surface-plasmon-polariton waveguides. The high visibility (greater than 90%) proves the bosonic nature of single plasmons and emphasizes the feasibility of achieving basic quantum logic gates for linear optical quantum computation. The effect of intrinsic losses in plasmonic waveguides with regard to quantum information processing is also discussed. Although the influence of this effect was negligible in the current experiment, our studies reveal that such losses can dramatically reduce quantum interference visibility in certain cases; thus, quantum coherence must be carefully considered when designing QPIC devices.
[ { "created": "Wed, 5 Feb 2014 07:19:27 GMT", "version": "v1" } ]
2014-07-17
[ [ "Cai", "Yong-Jing", "" ], [ "Li", "Ming", "" ], [ "Ren", "Xi-Feng", "" ], [ "Zou", "Chang-Ling", "" ], [ "Xiong", "Xiao", "" ], [ "Lei", "Hua-Lin", "" ], [ "Liu", "Bi-Heng", "" ], [ "Guo", "Guo-Ping", "" ], [ "Guo", "Guang-Can", "" ] ]
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1402.0963
Enno Giese
Enno Giese, Wolfgang Zeller, Stephan Kleinert, Matthias Meister, Vincenzo Tamma, Albert Roura, and Wolfgang P. Schleich
The interface of gravity and quantum mechanics illuminated by Wigner phase space
69 pages, 6 figures, minor changes to match the published version. The original publication is available at http://en.sif.it/books/series/proceedings_fermi or http://ebooks.iospress.nl/volumearticle/38097
Proceedings of the International School of Physics "Enrico Fermi" Course 188 "Atom Interferometry", edited by G. M. Tino and M. A. Kasevich (IOS, Amsterdam; SIF, Bologna; 2014), pp. 171-236
10.3254/978-1-61499-448-0-171
null
quant-ph physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We provide an introduction into the formulation of non-relativistic quantum mechanics using the Wigner phase-space distribution function and apply this concept to two physical situations at the interface of quantum theory and general relativity: (i) the motion of an ensemble of cold atoms relevant to tests of the weak equivalence principle, and (ii) the Kasevich-Chu interferometer. In order to lay the foundations for this analysis we first present a representation-free description of the Kasevich-Chu interferometer based on unitary operators.
[ { "created": "Wed, 5 Feb 2014 08:07:52 GMT", "version": "v1" }, { "created": "Mon, 28 Sep 2015 09:09:20 GMT", "version": "v2" } ]
2015-09-29
[ [ "Giese", "Enno", "" ], [ "Zeller", "Wolfgang", "" ], [ "Kleinert", "Stephan", "" ], [ "Meister", "Matthias", "" ], [ "Tamma", "Vincenzo", "" ], [ "Roura", "Albert", "" ], [ "Schleich", "Wolfgang P.", "" ] ]
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1402.0972
Thierry P Berger
Thierry P. Berger
Construction of dyadic MDS matrices for cryptographic applications
This paper has been withdrawn. Indeed, similar results to those presented in this paper have been obtained in [1]. [1] A. M. Youssef, S. Mister, and S. E. Tavares, "On the design of linear transformations for substitution permutation encryption networks," SAC'97, 1997, pp. 40--48
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cs.CR cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Many recent block ciphers use Maximum Distance Separable (MDS) matrices in their diffusion layer. The main objective of this operation is to spread as much as possible the differences between the outputs of nonlinear Sboxes. So they generally act at nibble or at byte level. The MDS matrices are associated to MDS codes of ratio 1/2. The most famous example is the MixColumns operation of the AES block cipher. In this example, the MDS matrix was carefully chosen to obtain compact and efficient implementations. However, this MDS matrix is dedicated to 8-bit words, and is not always adapted to lightweight applications. Recently, several studies have been devoted to the construction of recursive diffusion layers. Such a method allows to apply an MDS matrix using an iterative process which looks like a Feistel network with linear functions instead of nonlinear. Our approach is quite different. We present a generic construction of classical MDS matrices that are not recursively computed, but that are strong symmetric in order to either accelerate their evaluation with a minimal number of look-up tables, or to perform this evaluation with a minimal number of gates in a circuit. We call this particular kind of matrices "dyadic matrices", since they are related to dyadic codes. We study some basic properties of such matrices. We introduce a generic construction of involutive dyadic MDS matrices from Reed Solomon codes. Finally, we discuss the implementation aspects of these dyadic MDS matrices in order to build efficient block ciphers.
[ { "created": "Wed, 5 Feb 2014 08:48:48 GMT", "version": "v1" }, { "created": "Wed, 5 Mar 2014 18:12:25 GMT", "version": "v2" } ]
2014-03-06
[ [ "Berger", "Thierry P.", "" ] ]
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1402.0978
Ali Zarezade
Ali Zarezade, Hamid R. Rabiee, Ali Soltani-Farani, Ahmad Khajenezhad
Patchwise Joint Sparse Tracking with Occlusion Detection
null
null
10.1109/TIP.2014.2346029
null
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper presents a robust tracking approach to handle challenges such as occlusion and appearance change. Here, the target is partitioned into a number of patches. Then, the appearance of each patch is modeled using a dictionary composed of corresponding target patches in previous frames. In each frame, the target is found among a set of candidates generated by a particle filter, via a likelihood measure that is shown to be proportional to the sum of patch-reconstruction errors of each candidate. Since the target's appearance often changes slowly in a video sequence, it is assumed that the target in the current frame and the best candidates of a small number of previous frames, belong to a common subspace. This is imposed using joint sparse representation to enforce the target and previous best candidates to have a common sparsity pattern. Moreover, an occlusion detection scheme is proposed that uses patch-reconstruction errors and a prior probability of occlusion, extracted from an adaptive Markov chain, to calculate the probability of occlusion per patch. In each frame, occluded patches are excluded when updating the dictionary. Extensive experimental results on several challenging sequences shows that the proposed method outperforms state-of-the-art trackers.
[ { "created": "Wed, 5 Feb 2014 09:08:11 GMT", "version": "v1" } ]
2015-06-18
[ [ "Zarezade", "Ali", "" ], [ "Rabiee", "Hamid R.", "" ], [ "Soltani-Farani", "Ali", "" ], [ "Khajenezhad", "Ahmad", "" ] ]
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1402.0983
Michele Ruggeri
Claas Abert, Gino Hrkac, Marcus Page, Dirk Praetorius, Michele Ruggeri, Dieter Suess
Spin-polarized transport in ferromagnetic multilayers: An unconditionally convergent FEM integrator
23 pages, 1 figure
Comput. Math. Appl., 68 (2014), 639-654
10.1016/j.camwa.2014.07.010
null
math.NA physics.comp-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose and analyze a decoupled time-marching scheme for the coupling of the Landau-Lifshitz-Gilbert equation with a quasilinear diffusion equation for the spin accumulation. This model describes the interplay of magnetization and electron spin accumulation in magnetic and non-magnetic multilayer structures. Despite the strong nonlinearity of the overall PDE system, the proposed integrator requires only the solution of two linear systems per time-step. Unconditional convergence of the integrator towards weak solutions is proved.
[ { "created": "Wed, 5 Feb 2014 09:24:22 GMT", "version": "v1" }, { "created": "Mon, 30 Jun 2014 15:30:07 GMT", "version": "v2" } ]
2014-12-10
[ [ "Abert", "Claas", "" ], [ "Hrkac", "Gino", "" ], [ "Page", "Marcus", "" ], [ "Praetorius", "Dirk", "" ], [ "Ruggeri", "Michele", "" ], [ "Suess", "Dieter", "" ] ]
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1402.0988
Sascha Kurz
Sascha Kurz
The inverse problem for power distributions in committees
46 pages, 2 tables
null
10.1007/s00355-015-0946-8
null
cs.GT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Several power indices have been introduced in the literature in order to measure the influence of individual committee members on the aggregated decision. Here we ask the inverse question and aim to design voting rules for a committee such that a given desired power distribution is met as closely as possible. We present an exact algorithm for a large class of different power indices based on integer linear programming. With respect to negative approximation results we generalize the approach of Alon and Edelman who studied power distributions for the Banzhaf index, where most of the power is concentrated on few coordinates. It turned out that each Banzhaf vector of an n-member committee that is near to such a desired power distribution, has to be also near to the Banzhaf vector of a k-member committee. We show that such Alon-Edelman type results are possible for other power indices like e.g. the Public Good index or the Coleman index to prevent actions, while they are principally impossible for e.g. the Johnston index.
[ { "created": "Wed, 5 Feb 2014 09:33:10 GMT", "version": "v1" } ]
2016-01-22
[ [ "Kurz", "Sascha", "" ] ]
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1402.0990
Darka Labavi\'c
Darka Labavic and Hildegard Meyer-Ortmanns
A simple mechanism for controlling the onset and arrest of collective oscillations in genetic circuits
null
null
null
null
q-bio.MN nlin.AO physics.bio-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study a system of dynamical units, each of which shows excitable or oscillatory behavior, depending on the choice of parameters. When we couple these units with repressive bonds, we can control the duration of collective oscillations for an intermediate period between collective fixed-point behavior. The control mechanism works by monotonically increasing a single bifurcation parameter. Both the onset and arrest of oscillations are due to bifurcations. Depending on the coupling strength, the network topology and the tuning speed, our numerical simulations reveal a rich dynamics out-of-equilibrium with multiple inherent time scales, long transients towards the stationary states and interesting transient patterns like self-organized pacemakers. Zooming into the transition regime, we pursue the arrest of oscillations along the arms of spirals. We point out possible relations to the genetic network of segmentation clocks.
[ { "created": "Wed, 5 Feb 2014 09:45:43 GMT", "version": "v1" } ]
2014-02-06
[ [ "Labavic", "Darka", "" ], [ "Meyer-Ortmanns", "Hildegard", "" ] ]
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1402.0991
Nicolas Pos\'e
N. Pos\'e and K. J. Schrenk and N. A. M. Ara\'ujo and H. J. Herrmann
Shortest path and Schramm-Loewner Evolution
7 pages and 5 figures
Sci. Rep. 4, 5495 (2014)
10.1038/srep05495
null
cond-mat.stat-mech physics.comp-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We numerically show that the statistical properties of the shortest path on critical percolation clusters are consistent with the ones predicted for Schramm-Loewner evolution (SLE) curves for $\kappa=1.04\pm0.02$. The shortest path results from a global optimization process. To identify it, one needs to explore an entire area. Establishing a relation with SLE permits to generate curves statistically equivalent to the shortest path from a Brownian motion. We numerically analyze the winding angle, the left passage probability, and the driving function of the shortest path and compare them to the distributions predicted for SLE curves with the same fractal dimension. The consistency with SLE opens the possibility of using a solid theoretical framework to describe the shortest path and it raises relevant questions regarding conformal invariance and domain Markov properties, which we also discuss.
[ { "created": "Wed, 5 Feb 2014 09:46:10 GMT", "version": "v1" }, { "created": "Thu, 3 Jul 2014 16:36:42 GMT", "version": "v2" } ]
2014-07-04
[ [ "Posé", "N.", "" ], [ "Schrenk", "K. J.", "" ], [ "Araújo", "N. A. M.", "" ], [ "Herrmann", "H. J.", "" ] ]
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1402.0993
Ahmed Alaa
Ahmed M. Alaa
Defeating the Eavesdropper: On the Achievable Secrecy Capacity using Reconfigurable Antennas
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cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we consider the transmission of confidential messages over slow fading wireless channels in the presence of an eavesdropper. We propose a transmission scheme that employs a single reconfigurable antenna at each of the legitimate partners, whereas the eavesdropper uses a single conventional antenna. A reconfigurable antenna can switch its propagation characteristics over time and thus it perceives different fading channels. It is shown that without channel side information (CSI) at the legitimate partners, the main channel can be transformed into an ergodic regime offering a \textit{secrecy capacity} gain for strict outage constraints. If the legitimate partners have partial or full channel side information (CSI), a sort of selection diversity can be applied boosting the maximum secret communication rate. In this case, fading acts as a friend not a foe.
[ { "created": "Wed, 5 Feb 2014 09:59:09 GMT", "version": "v1" } ]
2014-02-06
[ [ "Alaa", "Ahmed M.", "" ] ]
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1402.0995
Soeren Toxvaerd
Soeren Toxvaerd
The role of carbohydrates at the origin of homochirality in biosystems
26 pages, 6 figures
null
10.1007/s11084-013-9342-5
null
physics.bio-ph q-bio.BM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Pasteur has demonstrated that the chiral components in a racemic mixture can separate in homochiral crystals. But with a strong chiral discrimination the chiral components in a concentrated mixture can also phase separate into homochiral fluid domains, and the isomerization kinetics can then perform a symmetry breaking into one thermodynamical stable homochiral system. Glyceraldehyde has a sufficient chiral discrimination to perform such a symmetry breaking. The requirement of a high concentration of the chiral reactant(s) in an aqueous solution in order to perform and $\textit{maintain}$ homochirality; the appearance of phosphorylation of almost all carbohydrates in the central machinery of life; the basic ideas that the biochemistry and the glycolysis and gluconeogenesis contain the trace of the biochemical evolution, all point in the direction of that homochirality was obtained just after- or at a phosphorylation of the very first products of the formose reaction, at high concentrations of the reactants in phosphate rich compartments in submarine hydrothermal vents. A racemic solution of D,L-glyceraldehyde-3-phosphate could be the template for obtaining homochiral D-glyceraldehyde-3-phosphate(aq) as well as L-amino acids.
[ { "created": "Wed, 5 Feb 2014 10:13:18 GMT", "version": "v1" } ]
2014-02-06
[ [ "Toxvaerd", "Soeren", "" ] ]
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1402.0997
Liliana Pasquale
Liliana Pasquale. Yijun Yu, Luca Cavallaro, Mazeiar Salehie, Thein Than Tun, Bashar Nuseibeh
Engineering Adaptive Digital Investigations using Forensics Requirements
null
null
null
null
cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A digital forensic investigation aims to collect and analyse the evidence necessary to demonstrate a potential hypothesis of a digital crime. Despite the availability of several digital forensics tools, investigators still approach each crime case from scratch, postulating potential hypotheses and analysing large volumes of data. This paper proposes to explicitly model forensic requirements in order to engineer software systems that are forensic-ready and guide the activities of a digital investigation. Forensic requirements relate some speculative hypotheses of a crime to the evidence that should be collected and analysed in a crime scene. In contrast to existing approaches, we propose to perform proactive activities to preserve important - potentially ephemeral - evidence, depending on the risk of a crime to take place. Once an investigation starts, the evidence collected proactively is analysed to assess if some of the speculative hypotheses of a crime hold and what further evidence is necessary to support them. For each hypothesis that is satisfied, a structured argument is generated to demonstrate how the evidence collected supports that hypothesis. Our evaluation results suggest that the approach provides correct investigative findings and reduces significantly the amount of evidence to be collected and the hypotheses to be analysed.
[ { "created": "Wed, 5 Feb 2014 10:19:25 GMT", "version": "v1" } ]
2014-02-06
[ [ "Yu", "Liliana Pasquale. Yijun", "" ], [ "Cavallaro", "Luca", "" ], [ "Salehie", "Mazeiar", "" ], [ "Tun", "Thein Than", "" ], [ "Nuseibeh", "Bashar", "" ] ]
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1402.0998
Julius Reiss
Julius Reiss
A family of energy stable, skew-symmetric finite difference schemes on collocated grids
null
null
null
null
physics.flu-dyn cs.NA math.NA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A simple scheme for incompressible, constant density flows is presented, which avoids odd-even decoupling for the Laplacian on a collocated grids. Energy stability is implied by maintaining strict energy conservation. Momentum is conserved. Arbitrary order in space and time can easily be obtained. The conservation properties hold on transformed grids.
[ { "created": "Wed, 5 Feb 2014 10:19:38 GMT", "version": "v1" } ]
2014-02-06
[ [ "Reiss", "Julius", "" ] ]
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1402.1001
Tiago Guerreiro
Hugo Nicolau, Jo\~ao Guerreiro, Tiago Guerreiro
Stressing the Boundaries of Mobile Accessibility
3 pages, two figures, ACM CHI 2013 Mobile Accessibility Workshop
null
null
null
cs.HC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Mobile devices gather the communication capabilities as no other gadget. Plus, they now comprise a wider set of applications while still maintaining reduced size and weight. They have started to include accessibility features that enable the inclusion of disabled people. However, these inclusive efforts still fall short considering the possibilities of such devices. This is mainly due to the lack of interoperability and extensibility of current mobile operating systems (OS). In this paper, we present a case study of a multi-impaired person where access to basic mobile applications was provided in an applicational basis. We outline the main flaws in current mobile OS and suggest how these could further empower developers to provide accessibility components. These could then be compounded to provide system-wide inclusion to a wider range of (multi)-impairments.
[ { "created": "Wed, 5 Feb 2014 10:30:52 GMT", "version": "v1" } ]
2014-02-06
[ [ "Nicolau", "Hugo", "" ], [ "Guerreiro", "João", "" ], [ "Guerreiro", "Tiago", "" ] ]
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1402.1010
Henrik Sandberg
Henrik Sandberg, Jean-Charles Delvenne, Nigel J. Newton, Sanjoy K. Mitter
Maximum work extraction and implementation costs for non-equilibrium Maxwell's demons
null
Phys. Rev. E 90, 042119, October 2014
10.1103/PhysRevE.90.042119
null
cond-mat.stat-mech cs.SY math.OC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this theoretical study, we determine the maximum amount of work extractable in finite time by a demon performing continuous measurements on a quadratic Hamiltonian system subjected to thermal fluctuations, in terms of the information extracted from the system. This is in contrast to many recent studies that focus on demons' maximizing the extracted work over received information, and operate close to equilibrium. The maximum work demon is found to apply a high-gain continuous feedback using a Kalman-Bucy estimate of the system state. A simple and concrete electrical implementation of the feedback protocol is proposed, which allows for analytic expressions of the flows of energy and entropy inside the demon. This let us show that any implementation of the demon must necessarily include an external power source, which we prove both from classical thermodynamics arguments and from a version of Landauer's memory erasure argument extended to non-equilibrium linear systems.
[ { "created": "Wed, 5 Feb 2014 11:02:44 GMT", "version": "v1" }, { "created": "Tue, 22 Jul 2014 14:47:15 GMT", "version": "v2" } ]
2014-10-21
[ [ "Sandberg", "Henrik", "" ], [ "Delvenne", "Jean-Charles", "" ], [ "Newton", "Nigel J.", "" ], [ "Mitter", "Sanjoy K.", "" ] ]
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1402.1012
Siti Nurul Hayatie Ishak
Siti Nurul Hayatie Ishak, Ariza Nordin
Sequencing Participatory Action Research and i* Modeling Framework in Capturing Multiple Roles Requirements
Siti Nurul Hayatie Ishak, Ariza Nordin"Sequencing Participatory Action Research and i* Modeling Framework in Capturing Multiple Roles Requirements", International Journal of Soft Computing and Software Engineering [JSCSE], Vol. 3, No. 3, pp. 123-130, 2013, Doi: 10.7321/jscse.v3.n3.20
null
10.7321/jscse.v3.n3.20
null
cs.SE
http://creativecommons.org/licenses/by/3.0/
This paper presents the conceptual framework for sequencing of Participatory Action Research (PAR) methodology with the implementation of i* modeling framework in capturing multiple roles requirements. There are multiple roles involved in the development of information system, thus it involves with difference users requirements and preferences, context as well as the demands which become a challenge in development of system. This is due to these roles where information of the project monitoring is perceived in accordance to their role and domain. In the development of information systems, requirement engineering is a vital methodology. Requirement engineering (RE) consists of several phases which elicitation is a crucial phase in RE since it requires researcher to gather the requirement from the users. Methods of eliciting requirements are now more co-operative. Based on the preliminary study of construction-based in Malaysia, evidence of dynamic requirements has been observed according to the environments, economic, technology and manpower involved in the construction project. An adaptive design for project monitoring is needed which allow the physical system to self-adapt in response to the changing environments. Adaptive design requires selecting the right techniques of requirements elicitation. The conceptual framework defined shall be used to elicit requirements from a local construction company.
[ { "created": "Wed, 5 Feb 2014 11:12:20 GMT", "version": "v1" } ]
2014-02-06
[ [ "Ishak", "Siti Nurul Hayatie", "" ], [ "Nordin", "Ariza", "" ] ]
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1402.1027
Vesal Hakami
Vesal Hakami and Mehdi Dehghan
Learning Stationary Correlated Equilibria in Constrained General-Sum Stochastic Games
25 pages, 2 figures, 5 tables in IEEE Transactions on Cybernetics, Vol. XX, No. XX, 2015
IEEE Transactions on Cybernetics, Vol. 46, No. 7, pp. 1640-1654, July 2016
10.1109/TCYB.2015.2453165
null
cs.GT cs.MA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study constrained general-sum stochastic games with unknown Markovian dynamics. A distributed constrained no-regret Q-learning scheme (CNRQ) is presented to guarantee convergence to the set of stationary correlated equilibria of the game. Prior art addresses the unconstrained case only, is structured with nested control loops, and has no convergence result. CNRQ is cast as a single-loop three-timescale asynchronous stochastic approximation algorithm with set-valued update increments. A rigorous convergence analysis with differential inclusion arguments is given which draws on recent extensions of the theory of stochastic approximation to the case of asynchronous recursive inclusions with set-valued mean fields. Numerical results are given for the exemplary application of CNRQ to decentralized resource control in heterogeneous wireless networks (HetNets).
[ { "created": "Wed, 5 Feb 2014 12:50:40 GMT", "version": "v1" }, { "created": "Mon, 10 Feb 2014 10:21:29 GMT", "version": "v2" }, { "created": "Sat, 1 Mar 2014 11:38:52 GMT", "version": "v3" }, { "created": "Mon, 1 Jun 2015 11:26:42 GMT", "version": "v4" } ]
2016-06-16
[ [ "Hakami", "Vesal", "" ], [ "Dehghan", "Mehdi", "" ] ]
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1402.1036
Tiago Guerreiro
Tiago Guerreiro
User-Sensitive Mobile Interfaces: Accounting for Individual Differences amongst the Blind
330 pages, PhD Thesis, Technical University of Lisbon
null
null
null
cs.HC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Mobile phones pervade our daily lives and play ever expanding roles in many contexts. Their ubiquitousness makes them pivotal in empowering disabled people. However, if no inclusive approaches are provided, it becomes a strong vehicle of exclusion. Even though current solutions try to compensate for the lack of sight, not all information reaches the blind user. Good spatial ability is still required to make sense of the device and its interface, as well as the need to memorize positions on screen or keys and associated actions in a keypad. Those problems are compounded by many individual attributes such as age, age of blindness onset or tactile sensitivity which often are forgotten by designers. Worse, the entire blind population is recurrently thought of as homogeneous (often stereotypically so). Thus all users face the same solutions, ignoring their specific capabilities and needs. We usually ignore this diversity as we have the ability to adapt and become experts in interfaces that were probably maladjusted to begin with. This adaptation is not always within reach. Interaction with mobile devices is highly visually demanding which widens this gap amongst blind people. It is paramount to understand the impact of individual differences and their relationship with demands to enable the deployment of more inclusive solutions. We explore individual differences among blind people and assess how they are related with mobile interface demands, both at low (e.g. performing an on-screen gesture) and high level (text-entry) tasks. Results confirmed that different ability levels have significant impact on the performance attained by a blind person. Particularly, otherwise ignored attributes like tactile acuity, pressure sensitivity, spatial ability or verbal IQ have shown to be matched with specific mobile demands and parametrizations.
[ { "created": "Wed, 5 Feb 2014 13:32:39 GMT", "version": "v1" } ]
2014-02-06
[ [ "Guerreiro", "Tiago", "" ] ]
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1402.1037
Tiago Guerreiro
Tiago Guerreiro, Hugo Nicolau, Jo\~ao Oliveira, Joaquim Jorge, Daniel Gon\c{c}alves
Understanding Individual Differences: Towards Effective Mobile Interface Design and Adaptation for the Blind
3 pages, CHI 2011 Workshop on Dynamic Accessibility
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null
null
cs.HC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
No two people are alike. We usually ignore this diversity as we have the capability to adapt and, without noticing, become experts in interfaces that were probably misadjusted to begin with. This adaptation is not always at the user's reach. One neglected group is the blind. Spatial ability, memory, and tactile sensitivity are some characteristics that diverge between users. Regardless, all are presented with the same methods ignoring their capabilities and needs. Interaction with mobile devices is highly visually demanding which widens the gap between blind people. Our research goal is to identify the individual attributes that influence mobile interaction, considering the blind, and match them with mobile interaction modalities in a comprehensive and extensible design space. We aim to provide knowledge both for device design, device prescription and interface adaptation.
[ { "created": "Wed, 5 Feb 2014 13:41:24 GMT", "version": "v1" } ]
2014-02-06
[ [ "Guerreiro", "Tiago", "" ], [ "Nicolau", "Hugo", "" ], [ "Oliveira", "João", "" ], [ "Jorge", "Joaquim", "" ], [ "Gonçalves", "Daniel", "" ] ]
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1402.1045
Michele Ceriotti
Michele Ceriotti, Joshua More, David E. Manolopoulos
i-PI: A Python interface for ab initio path integral molecular dynamics simulations
null
Computer Physics Communications 185(3), 1019-1026 (2014)
10.1016/j.cpc.2013.10.027
null
physics.comp-ph cond-mat.mtrl-sci physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Recent developments in path integral methodology have significantly reduced the computational expense of including quantum mechanical effects in the nuclear motion in ab initio molecular dynamics simulations. However, the implementation of these developments requires a considerable programming effort, which has hindered their adoption. Here we describe i-PI, an interface written in Python that has been designed to minimise the effort required to bring state-of-the-art path integral techniques to an electronic structure program. While it is best suited to first principles calculations and path integral molecular dynamics, i-PI can also be used to perform classical molecular dynamics simulations, and can just as easily be interfaced with an empirical forcefield code. To give just one example of the many potential applications of the interface, we use it in conjunction with the CP2K electronic structure package to showcase the importance of nuclear quantum effects in high pressure water.
[ { "created": "Wed, 5 Feb 2014 14:10:59 GMT", "version": "v1" } ]
2014-02-06
[ [ "Ceriotti", "Michele", "" ], [ "More", "Joshua", "" ], [ "Manolopoulos", "David E.", "" ] ]
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1402.1046
Xiongfei Jiang
F. Y. Ouyang, B. Zheng, X.F. Jiang
Spatial and temporal structures of four financial markets in Greater China
7 figures. Accepted by Physica A
Physica A: Statistical Mechanics and its Applications Volume 402, 2014, Pages 236
10.1016/j.physa.2014.02.006
null
q-fin.ST physics.soc-ph
http://creativecommons.org/licenses/by/3.0/
We investigate the spatial and temporal structures of four financial markets in Greater China. In particular, we uncover different characteristics of the four markets by analyzing the sector and subsector structures which are detected through the random matrix theory. Meanwhile, we observe that the Taiwan and Hongkong stock markets show a negative return-volatility correlation, i.e., the so-called leverage effect. The Shanghai and Shenzhen stock markets are more complicated. Before the year 2000, the two markets exhibit a strong positive return-volatility correlation, which is called the anti-leverage effect. After 2000, however, it gradually changes to the leverage effect. We also find that the recurrence interval distributions of both the trading volume volatilities and price volatilities follow a power law behavior, while the exponents vary among different markets.
[ { "created": "Wed, 5 Feb 2014 14:17:12 GMT", "version": "v1" } ]
2014-04-24
[ [ "Ouyang", "F. Y.", "" ], [ "Zheng", "B.", "" ], [ "Jiang", "X. F.", "" ] ]
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1402.1047
Uriel Feige
Uriel Feige
On robustly asymmetric graphs
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null
null
null
cs.DM math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
O'Donnell, Wright, Wu and Zhou [SODA 2014] introduced the notion of robustly asymmetric graphs. Roughly speaking, these are graphs in which for every $0 \le \rho \le 1$, every permutation that permutes a $\rho$ fraction of the vertices maps a $\Theta(\rho)$ fraction of the edges to non-edges. We show that there are graphs for which the constant hidden in the $\Theta$ notation is roughly~1.
[ { "created": "Wed, 5 Feb 2014 14:21:00 GMT", "version": "v1" } ]
2014-02-06
[ [ "Feige", "Uriel", "" ] ]
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1402.1051
Dominique Duval
Jean-Guillaume Dumas (LJK), Dominique Duval (LJK), Jean-Claude Reynaud (RC)
Breaking a monad-comonad symmetry between computational effects
arXiv admin note: substantial text overlap with arXiv:1310.0605
Mathematical Structures in Computer Science 22, 4 (2012) p.719-722
10.1017/S0960129511000752
null
cs.LO math.CT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Computational effects may often be interpreted in the Kleisli category of a monad or in the coKleisli category of a comonad. The duality between monads and comonads corresponds, in general, to a symmetry between construction and observation, for instance between raising an exception and looking up a state. Thanks to the properties of adjunction one may go one step further: the coKleisli-on-Kleisli category of a monad provides a kind of observation with respect to a given construction, while dually the Kleisli-on-coKleisli category of a comonad provides a kind of construction with respect to a given observation. In the previous examples this gives rise to catching an exception and updating a state. However, the interpretation of computational effects is usually based on a category which is not self-dual, like the category of sets. This leads to a breaking of the monad-comonad duality. For instance, in a distributive category the state effect has much better properties than the exception effect. This remark provides a novel point of view on the usual mechanism for handling exceptions. The aim of this paper is to build an equational semantics for handling exceptions based on the coKleisli-on-Kleisli category of the monad of exceptions. We focus on n-ary functions and conditionals. We propose a programmer's language for exceptions and we prove that it has the required behaviour with respect to n-ary functions and conditionals.
[ { "created": "Wed, 5 Feb 2014 14:26:14 GMT", "version": "v1" } ]
2014-02-13
[ [ "Dumas", "Jean-Guillaume", "", "LJK" ], [ "Duval", "Dominique", "", "LJK" ], [ "Reynaud", "Jean-Claude", "", "RC" ] ]
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1402.1056
Christophe Jouvet
G\'eraldine F\'eraud (PIIM), Claude Dedonder (PIIM), Satchin Soorkia (ISMO), Christophe Jouvet (PIIM)
Photo-fragmentation spectroscopy of benzylium and 1-phenylethyl cations
null
Journal of Chemical Physics 140 (2014) 024302
10.1063/1.4858409
null
physics.atm-clus
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The electronic spectra of cold benzylium (C6H5-CH2+) and 1-phenylethyl (C6H5-CH-CH3+)cations have been recorded via photofragment spectroscopy. Benzylium and 1-phenylethyl cations produced from electrosprayed benzylamine and phenylethylamine solutions, respectively, were stored in a cryogenically cooled quadrupole ion trap and photodissociated by an OPO laser, scanned in parts of the UV and visible regions (600-225 nm). The electronic states and active vibrational modes of the benzylium and 1-phenylethyl cations as well as those of their tropylium or methyl tropylium isomers have been calculated with ab initio methods for comparison with the spectra observed. Sharp vibrational progressions are observed in the visible region while the absorption features are much broader in the UV. The visible spectrum of the benzylium cation is similar to that obtained in an argon tagging experiment [V. Dryza, N. Chalyavi, J.A. Sanelli, and E.J. Bieske, J. Chem. Phys. 137, 204304 (2012)], with an additional splitting assigned to Fermi resonances. The visible spectrum of the 1-phenylethyl cation also shows vibrational progressions. For both cations, the second electronic transition is observed in the UV, around 33 000 cm-1 (4.1 eV), and shows a broadened vibrational progression. In both cases the S2 optimized geometry is non planar. The third electronic transition observed around 40 000 cm-1 (5.0 eV) is even broader with no apparent vibrational structures, which is indicative of either a fast non-radiative process or a very large change in geometry between the excited and the ground states. The oscillator strengths calculated for tropylium and methyl tropylium are weak. Therefore, these isomeric structures are most likely not responsible for these absorption features. Finally, the fragmentation pattern changes in the second and third electronic states: C2H2 loss becomes predominant at higher excitation energies, for both cations.
[ { "created": "Wed, 5 Feb 2014 14:32:40 GMT", "version": "v1" } ]
2014-02-06
[ [ "Féraud", "Géraldine", "", "PIIM" ], [ "Dedonder", "Claude", "", "PIIM" ], [ "Soorkia", "Satchin", "", "ISMO" ], [ "Jouvet", "Christophe", "", "PIIM" ] ]
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1402.1070
On Shun Pak
On Shun Pak and Eric Lauga
Generalized squirming motion of a sphere
null
null
null
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A number of swimming microorganisms such as ciliates ($\textit{Opalina}$) and multicellular colonies of flagellates ($\textit{Volvox}$) are approximately spherical in shape and swim using beating arrays of cilia or short flagella covering their surfaces. Their physical actuation on the fluid may be mathematically modeled as the generation of surface velocities on a continuous spherical surface -- a model known in the literature as squirming, which has been used to address various aspects of the biological physics of locomotion. Previous analyses of squirming assumed axisymmetric fluid motion and hence restricted all swimming kinematics to take place along a line. In this paper we generalize squirming to three spatial dimensions. We derive analytically the flow field surrounding a spherical squirmer with arbitrary surface motion, and use it to derive its three-dimensional translational and rotational swimming kinematics. We then use our results to physically interpret the flow field induced by the swimmer in terms of fundamental flow singularities up to terms decaying spatially as $\sim 1/r^3$. Our results will enable to develop new models in biological physics, in particular in the area of hydrodynamic interactions and collective locomotion.
[ { "created": "Wed, 5 Feb 2014 15:17:36 GMT", "version": "v1" } ]
2014-02-06
[ [ "Pak", "On Shun", "" ], [ "Lauga", "Eric", "" ] ]
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1402.1072
Muhammed Sayin O
Muhammed O. Sayin and Suleyman S. Kozat
Compressive Diffusion Strategies Over Distributed Networks for Reduced Communication Load
Submitted to IEEE Transactions on Signal Processing
null
10.1109/TSP.2014.2347917
null
cs.SY cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the compressive diffusion strategies over distributed networks based on the diffusion implementation and adaptive extraction of the information from the compressed diffusion data. We demonstrate that one can achieve a comparable performance with the full information exchange configurations, even if the diffused information is compressed into a scalar or a single bit. To this end, we provide a complete performance analysis for the compressive diffusion strategies. We analyze the transient, steady-state and tracking performance of the configurations in which the diffused data is compressed into a scalar or a single-bit. We propose a new adaptive combination method improving the convergence performance of the compressive diffusion strategies further. In the new method, we introduce one more freedom-of-dimension in the combination matrix and adapt it by using the conventional mixture approach in order to enhance the convergence performance for any possible combination rule used for the full diffusion configuration. We demonstrate that our theoretical analysis closely follow the ensemble averaged results in our simulations. We provide numerical examples showing the improved convergence performance with the new adaptive combination method.
[ { "created": "Wed, 5 Feb 2014 15:46:29 GMT", "version": "v1" } ]
2015-06-18
[ [ "Sayin", "Muhammed O.", "" ], [ "Kozat", "Suleyman S.", "" ] ]
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1402.1075
No\'e Lugaz
N. Lugaz and C. J. Farrugia
A New Class of Complex Ejecta Resulting from the Interaction of two CMEs and its Expected Geoeffectiveness
Accepted to GRL; 5 pages, slightly different figures in print version
Geophysical Research Letters, Volume 41, Issue 3, pp. 769-776, 2014
10.1002/2013GL058789
null
astro-ph.SR physics.space-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A significant portion of transients measured by spacecraft at 1 AU does not show the well-defined properties of magnetic clouds (MCs). Here, we propose a new class of complex, non-MC ejecta resulting from the interaction of two CMEs with different orientation, which differ from the previously studied multiple-MC event. At 1 AU, they are associated with a smooth rotation of the magnetic field vector over an extended duration and do not show clear signs of interaction. We determine the characteristics of such events based on a numerical simulation and identify and analyze a potential case in the long-duration CME measured in situ in 2001 March 19-22. Such events may result in intense, long-duration geo-magnetic storms, with sawtooth events, and may sometimes be misidentified as isolated CMEs.
[ { "created": "Wed, 5 Feb 2014 16:07:40 GMT", "version": "v1" }, { "created": "Thu, 27 Mar 2014 14:53:39 GMT", "version": "v2" } ]
2014-03-28
[ [ "Lugaz", "N.", "" ], [ "Farrugia", "C. J.", "" ] ]
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1402.1076
Aaron Bohy
Aaron Bohy, V\'eronique Bruy\`ere and Jean-Fran\c{c}ois Raskin
Symblicit algorithms for optimal strategy synthesis in monotonic Markov decision processes (extended version)
null
null
null
null
cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
When treating Markov decision processes (MDPs) with large state spaces, using explicit representations quickly becomes unfeasible. Lately, Wimmer et al. have proposed a so-called symblicit algorithm for the synthesis of optimal strategies in MDPs, in the quantitative setting of expected mean-payoff. This algorithm, based on the strategy iteration algorithm of Howard and Veinott, efficiently combines symbolic and explicit data structures, and uses binary decision diagrams as symbolic representation. The aim of this paper is to show that the new data structure of pseudo-antichains (an extension of antichains) provides another interesting alternative, especially for the class of monotonic MDPs. We design efficient pseudo-antichain based symblicit algorithms (with open source implementations) for two quantitative settings: the expected mean-payoff and the stochastic shortest path. For two practical applications coming from automated planning and LTL synthesis, we report promising experimental results w.r.t. both the run time and the memory consumption.
[ { "created": "Wed, 5 Feb 2014 16:22:41 GMT", "version": "v1" }, { "created": "Fri, 25 Apr 2014 07:07:53 GMT", "version": "v2" }, { "created": "Fri, 20 Jun 2014 07:25:47 GMT", "version": "v3" } ]
2014-06-23
[ [ "Bohy", "Aaron", "" ], [ "Bruyère", "Véronique", "" ], [ "Raskin", "Jean-François", "" ] ]
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1402.1077
Ricardo Martinez-Garcia
Ricardo Martinez-Garcia, Justin M. Calabrese, E. Hernandez-Garcia, C. Lopez
Minimal mechanisms for vegetation patterns in semiarid regions
8 pages, 4 figures
Phil. Trans. R. Soc. A 28 October 2014 vol. 372 no. 2027 20140068
10.1098/rsta.2014.0068
null
q-bio.PE nlin.PS physics.bio-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The minimal ecological requirements for formation of regular vegetation patterns in semiarid systems have been recently questioned. Against the general belief that a combination of facilitative and competitive interactions is necessary, recent theoretical studies suggest that, under broad conditions, nonlocal competition among plants alone may induce patterns. In this paper, we review results along this line, presenting a series of models that yield spatial patterns when finite-range competition is the only driving force. A preliminary derivation of this type of model from a more detailed one that considers water-biomass dynamics is also presented. Keywords: Vegetation patterns, nonlocal interactions
[ { "created": "Wed, 5 Feb 2014 16:23:43 GMT", "version": "v1" }, { "created": "Mon, 8 Sep 2014 13:00:40 GMT", "version": "v2" } ]
2014-09-24
[ [ "Martinez-Garcia", "Ricardo", "" ], [ "Calabrese", "Justin M.", "" ], [ "Hernandez-Garcia", "E.", "" ], [ "Lopez", "C.", "" ] ]
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1402.1078
Xinjie Huang
C. Yang, X.J. Huang, C.M. Du, B.C. Huang, Z. Ahammed, A. Banerjee, P. Bhattarari, S. Biswas, B. Bowen, J. Butterworth, M. Calder\'on de la Barca S\'anchez, H. Carson, S. Chattopadhyay, D. Cebra, H.F. Chen, J.P. Cheng, M. Codrington, G. Eppley, C. Flores, F. Geurts, G.W. Hoffmann, A. Jentsch, A. Kesich, C. Li, Y.J. Li, W.J. Llope, S. Mioduszewski, Y. Mohamed, T. Nussbaum, A. Roy, L. Ruan, J.J. Schambach, Y.J. Sun, Y. Wang, K. Xin, Z. Xu, S. Yang, X.L. Zhu
Calibration and performance of the STAR Muon Telescope Detector using cosmic rays
15 pages, 10 figures
null
10.1016/j.nima.2014.05.075
null
physics.ins-det astro-ph.IM nucl-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We report the timing and spatial resolution from the Muon Telescope Detector (MTD) installed in the STAR experiment at RHIC. Cosmic ray muons traversing the STAR detector have an average transverse momentum of 6 GeV/c. Due to their very small multiple scattering, these cosmic muons provide an ideal tool to calibrate the detectors and measure their timing and spatial resolution. The values obtained were ~100 ps and ~1-2 cm, respectively. These values are comparable to those obtained from cosmic-ray bench tests and test beams.
[ { "created": "Wed, 5 Feb 2014 16:27:03 GMT", "version": "v1" } ]
2015-06-18
[ [ "Yang", "C.", "" ], [ "Huang", "X. J.", "" ], [ "Du", "C. M.", "" ], [ "Huang", "B. C.", "" ], [ "Ahammed", "Z.", "" ], [ "Banerjee", "A.", "" ], [ "Bhattarari", "P.", "" ], [ "Biswas", "S.", "" ], [ "Bowen", "B.", "" ], [ "Butterworth", "J.", "" ], [ "Sánchez", "M. Calderón de la Barca", "" ], [ "Carson", "H.", "" ], [ "Chattopadhyay", "S.", "" ], [ "Cebra", "D.", "" ], [ "Chen", "H. F.", "" ], [ "Cheng", "J. P.", "" ], [ "Codrington", "M.", "" ], [ "Eppley", "G.", "" ], [ "Flores", "C.", "" ], [ "Geurts", "F.", "" ], [ "Hoffmann", "G. W.", "" ], [ "Jentsch", "A.", "" ], [ "Kesich", "A.", "" ], [ "Li", "C.", "" ], [ "Li", "Y. J.", "" ], [ "Llope", "W. J.", "" ], [ "Mioduszewski", "S.", "" ], [ "Mohamed", "Y.", "" ], [ "Nussbaum", "T.", "" ], [ "Roy", "A.", "" ], [ "Ruan", "L.", "" ], [ "Schambach", "J. J.", "" ], [ "Sun", "Y. J.", "" ], [ "Wang", "Y.", "" ], [ "Xin", "K.", "" ], [ "Xu", "Z.", "" ], [ "Yang", "S.", "" ], [ "Zhu", "X. L.", "" ] ]
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1402.1083
Bo Sernelius
Mathias Bostr\"om, Dan Huang, Weihong Yang, Clas Persson and Bo E. Sernelius
Lithium atom storage in nanoporous cellulose via surface induced $\rm Li_2$ breakage
5 pages, 6 figures
Europhysics Letters, 104, 63003 (2013)
10.1209/0295-5075/104/63003
null
cond-mat.mes-hall physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We demonstrate a physical mechanism that enhances a splitting of diatomic $\rm Li_2$ at cellulose surfaces. The origin of this splitting is a possible surface induced diatomic excited state resonance repulsion. The atomic Li is then free to form either physical or chemical bonds with the cellulose surface and even diffuse into the cellulose layer structure. This allows for an enhanced storage capacity of atomic Li in nanoporous cellulose
[ { "created": "Wed, 5 Feb 2014 16:45:26 GMT", "version": "v1" } ]
2014-02-10
[ [ "Boström", "Mathias", "" ], [ "Huang", "Dan", "" ], [ "Yang", "Weihong", "" ], [ "Persson", "Clas", "" ], [ "Sernelius", "Bo E.", "" ] ]
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1402.1088
Mohsen Yousefbeiki
Mohsen Yousefbeiki, Osama N. Alrabadi, and Julien Perruisseau-Carrier
Efficient MIMO Transmission of PSK Signals With a Single-Radio Reconfigurable Antenna
30 pages, 6 figures. IEEE Transactions on Communications, 2014
null
10.1109/TCOMM.2013.122113.130481
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Crucial developments to the recently introduced signal-space approach for multiplexing multiple data symbols using a single-radio switched antenna are presented. First, we introduce a general framework for expressing the spatial multiplexing relation of the transmit signals only from the antenna scattering parameters and the modulating reactive loading. This not only avoids tedious far-field calculations, but more importantly provides an efficient and practical strategy for spatially multiplexing PSK signals of any modulation order. The proposed approach allows ensuring a constant impedance matching at the input of the driving antenna for all symbol combinations, and as importantly uses only passive reconfigurable loads. This obviates the use of reconfigurable matching networks and active loads, respectively, thereby overcoming stringent limitations of previous single-feed MIMO techniques in terms of complexity, efficiency, and power consumption. The proposed approach is illustrated by the design of a realistic very compact antenna system optimized for multiplexing QPSK signals. The results show that the proposed approach can bring the MIMO benefits to the low-end user terminals at a reduced RF complexity.
[ { "created": "Wed, 5 Feb 2014 16:59:38 GMT", "version": "v1" } ]
2014-02-06
[ [ "Yousefbeiki", "Mohsen", "" ], [ "Alrabadi", "Osama N.", "" ], [ "Perruisseau-Carrier", "Julien", "" ] ]
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1402.1092
Ullrich M\"onich
Holger Boche and Ullrich J. M\"onich
Signal and System Approximation from General Measurements
This paper will be published as part of the book "New Perspectives on Approximation and Sampling Theory - Festschrift in honor of Paul Butzer's 85th birthday" in the Applied and Numerical Harmonic Analysis Series, Birkhauser (Springer-Verlag). Parts of this work have been presented at the IEEE International Conference on Acoustics, Speech, and Signal Processing 2014 (ICASSP 2014)
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cs.IT math.CV math.FA math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we analyze the behavior of system approximation processes for stable linear time-invariant (LTI) systems and signals in the Paley-Wiener space PW_\pi^1. We consider approximation processes, where the input signal is not directly used to generate the system output, but instead a sequence of numbers is used that is generated from the input signal by measurement functionals. We consider classical sampling which corresponds to a pointwise evaluation of the signal, as well as several more general measurement functionals. We show that a stable system approximation is not possible for pointwise sampling, because there exist signals and systems such that the approximation process diverges. This remains true even with oversampling. However, if more general measurement functionals are considered, a stable approximation is possible if oversampling is used. Further, we show that without oversampling we have divergence for a large class of practically relevant measurement procedures.
[ { "created": "Wed, 5 Feb 2014 17:08:53 GMT", "version": "v1" } ]
2014-02-06
[ [ "Boche", "Holger", "" ], [ "Mönich", "Ullrich J.", "" ] ]
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1402.1099
Hector Zenil
Hector Zenil
Levels of Abstraction and the Apparent Contradictory Philosophical Legacy of Turing and Shannon
A version of the essay published in the Q, the AISB Quarterly bulletin of the Society for the Study of Artificial Intelligence and Simulation of Behaviour
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null
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cs.GL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In a recent article, Luciano Floridi explains his view of Turing's legacy in connection to the philosophy of information. I will very briefly survey one of Turing's other contributions to the philosophy of information and computation, including similarities to Shannon's own methodological approach to information through communication, showing how crucial they are and have been as methodological strategies to understanding key aspects of these concepts. While Floridi's concept of Levels of Abstraction is related to the novel methodology of Turing's imitation game for tackling the question of machine intelligence, Turing's other main contribution to the philosophy of information runs contrary to it. Indeed, the seminal concept of computation universality strongly suggests the deletion of fundamental differences among seemingly different levels of description. How might we reconcile these apparently contradictory contributions? I will argue that Turing's contribution should prompt us to plot some directions for a philosophy of information and computation, one that closely parallels the most important developments in computer science, one that understands the profound implications of the works of Turing, Shannon and others.
[ { "created": "Wed, 5 Feb 2014 17:43:12 GMT", "version": "v1" } ]
2014-02-06
[ [ "Zenil", "Hector", "" ] ]
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1402.1106
Andrew Steane
Andrew M. Steane
Reduced-order Abraham-Lorentz-Dirac equation and the consistency of classical electromagnetism
8 pages, 1 figure; 2nd version has minor addition on impact of gravity; 3rd has added citations and better discussion of Ford and O'Connell
Am. J. Phys 83, 256 (2015)
10.1119/1.4897951
null
physics.class-ph gr-qc
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
It is widely believed that classical electromagnetism is either unphysical or inconsistent, owing to pathological behavior when self-force and radiation reaction are non-negligible. We argue that there is no inconsistency as long as it is recognized that certain types of charge distribution are simply impossible, such as, for example, a point particle with finite charge and finite inertia. This is owing to the fact that negative inertial mass is an unphysical concept in classical physics. It remains useful to obtain an equation of motion for small charged objects that describes their motion to good approximation without requiring knowledge of the charge distribution within the object. We give a simple method to achieve this, leading to a reduced-order form of the Abraham-Lorentz-Dirac equation, essentially as proposed by Eliezer, Landau and Lifshitz, and derived by Ford and O'Connell.
[ { "created": "Wed, 5 Feb 2014 17:54:15 GMT", "version": "v1" }, { "created": "Fri, 7 Feb 2014 14:33:58 GMT", "version": "v2" }, { "created": "Tue, 22 Jul 2014 15:33:49 GMT", "version": "v3" } ]
2015-10-13
[ [ "Steane", "Andrew M.", "" ] ]
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1402.1107
Arindam Pal
Arindam Pal
Approximation Algorithms for Covering and Packing Problems on Paths
Ph.D. thesis of Arindam Pal. 100 pages
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null
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cs.DS cs.DM math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Routing and scheduling problems are fundamental problems in combinatorial optimization, and also have many applications. Most variations of these problems are NP-Hard, so we need to use heuristics to solve these problems on large instances, which are fast and yet come close to the optimal value. In this thesis, we study the design and analysis of approximation algorithms for such problems. We focus on two important class of problems. The first is the Unsplittable Flow Problem and some of its variants and the second is the Resource Allocation for Job Scheduling Problem and some of its variants. The first is a packing problem, whereas the second is a covering problem.
[ { "created": "Wed, 5 Feb 2014 18:06:20 GMT", "version": "v1" } ]
2015-02-20
[ [ "Pal", "Arindam", "" ] ]
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1402.1115
Luca Comisso
Luca Comisso and Felipe A. Asenjo
Thermal-inertial effects on magnetic reconnection in relativistic pair plasmas
Accepted for publication in Physical Review Letters; 1 figure; Relativistic plasma physics
Phys. Rev. Lett. 113, 045001 (2014)
10.1103/PhysRevLett.113.045001
null
physics.plasm-ph astro-ph.HE astro-ph.SR physics.space-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The magnetic reconnection process is studied in relativistic pair plasmas when the thermal and inertial properties of the magnetohydrodynamical fluid are included. We find that in both Sweet-Parker and Petschek relativistic scenarios there is an increase of the reconnection rate owing to the thermal-inertial effects, both satisfying causality. To characterize the new effects we define a thermal-inertial number which is independent of the relativistic Lundquist number, implying that reconnection can be achieved even for vanishing resistivity as a result of only thermal-inertial effects. The current model has fundamental importance for relativistic collisionless reconnection, as it constitutes the simplest way to get reconnection rates faster than those accessible with the sole resistivity.
[ { "created": "Wed, 5 Feb 2014 18:20:14 GMT", "version": "v1" }, { "created": "Mon, 7 Jul 2014 07:54:32 GMT", "version": "v2" } ]
2015-02-20
[ [ "Comisso", "Luca", "" ], [ "Asenjo", "Felipe A.", "" ] ]
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1402.1120
Fabiano Corsetti
Fabiano Corsetti
Performance analysis of electronic structure codes on HPC systems: A case study of SIESTA
9 pages, 9 figures
PLOS ONE 9, e95390 (2014)
10.1371/journal.pone.0095390
null
physics.comp-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We report on scaling and timing tests of the SIESTA electronic structure code for ab initio molecular dynamics simulations using density-functional theory. The tests are performed on six large-scale supercomputers belonging to the PRACE Tier-0 network with four different architectures: Cray XE6, IBM BlueGene/Q, BullX, and IBM iDataPlex. We employ a systematic strategy for simultaneously testing weak and strong scaling, and propose a measure which is independent of the range of number of cores on which the tests are performed to quantify strong scaling efficiency as a function of simulation size. We find an increase in efficiency with simulation size for all machines, with a qualitatively different curve depending on the supercomputer topology, and discuss the connection of this functional form with weak scaling behaviour. We also analyze the absolute timings obtained in our tests, showing the range of system sizes and cores favourable for different machines. Our results can be employed as a guide both for running SIESTA on parallel architectures, and for executing similar scaling tests of other electronic structure codes.
[ { "created": "Wed, 5 Feb 2014 18:34:01 GMT", "version": "v1" }, { "created": "Tue, 22 Apr 2014 07:59:16 GMT", "version": "v2" } ]
2014-04-23
[ [ "Corsetti", "Fabiano", "" ] ]
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1402.1126
Kanti Aggarwal Dr.
KM Aggarwal and FP Keenan
Energy levels, radiative rates, and lifetimes for transitions in W XL
12p Text+2 Tables. The paper will appear this year in ADNDT
null
10.1016/j.adt.2014.02.006
null
physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Energy levels and radiative rates are reported for transitions in Br-like W XL, calculated with the general-purpose relativistic atomic structure package ({\sc grasp}). Configuration interaction (CI) has been included among 46 configurations (generating 4215 levels) over a wide energy range up to 213 Ryd. However, for conciseness results are only listed for the lowest 360 levels (with energies up to $\sim$ 43 Ryd), which mainly belong to the 4s$^2$4p$^5$, 4s$^2$4p$^4$4d, 4s$^2$4p$^4$4f, 4s4p$^6$, 4p$^6$4d, 4s4p$^5$4d, 4s$^2$4p$^3$4d$^2$, and 4s$^2$4p$^3$4d4f configurations, and provided for four types of transitions, i.e. E1, E2, M1, and M2. Comparisons are made with existing (but limited) results. However, to fully assess the accuracy of our data, analogous calculations have been performed with the flexible atomic code ({\sc fac}), including even a larger CI than in {\sc grasp}. Our energy levels are estimated to be accurate to better than 0.02 Ryd, whereas results for radiative rates (and lifetimes) should be accurate to better than $20\%$ for a majority of the strong transitions.
[ { "created": "Wed, 5 Feb 2014 18:53:21 GMT", "version": "v1" } ]
2015-06-18
[ [ "Aggarwal", "KM", "" ], [ "Keenan", "FP", "" ] ]
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1402.1127
Ahmed Elbanna
Ahmed E. Elbanna and Jean M. Carlson
A two-scale model for sheared fault gouge: Competition between macroscopic disorder and local viscoplasticity
50 pages, 7 figures
null
10.1002/2014JB011001
null
cond-mat.mtrl-sci cond-mat.soft physics.geo-ph
http://creativecommons.org/licenses/by-nc-sa/3.0/
We develop a model for sheared gouge layers that accounts for the local increase in temperature at the grain contacts during sliding. We use the shear transformation zone (STZ) theory, a statistical thermodynamic theory, to describe irreversible macroscopic plastic deformations due to local rearrangements of the gouge particles. We track the temperature evolution at the grain contacts using a one dimensional heat diffusion equation. At low temperatures, the strength of the asperities is limited by the flow strength, as predicted by dislocation creep models. At high temperatures, some of the constituents of the grains may melt leading to the degradation of the asperity strength. Our model predicts a logarithmic rate dependence of the steady state shear stress in the quasi-static regime. In the dense flow regime the frictional strength decreases rapidly with increasing slip rate due to the effect of thermal softening at the granular interfaces. The transient response following a step in strain rate includes a direct effect and a following evolution effect, both of which depend on the magnitude and direction of the velocity step. In addition to frictional heat, the energy budget includes an additional energy sink representing the fraction of external work consumed in increasing local disorder. The model links low-speed and high-speed frictional response of gouge layers, and provides an essential ingredient for multiscale modeling of earthquake ruptures with enhanced coseismic weakening.
[ { "created": "Wed, 5 Feb 2014 18:56:59 GMT", "version": "v1" } ]
2015-06-18
[ [ "Elbanna", "Ahmed E.", "" ], [ "Carlson", "Jean M.", "" ] ]
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1402.1128
Hasim Sak
Ha\c{s}im Sak, Andrew Senior, Fran\c{c}oise Beaufays
Long Short-Term Memory Based Recurrent Neural Network Architectures for Large Vocabulary Speech Recognition
null
null
null
null
cs.NE cs.CL cs.LG stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Long Short-Term Memory (LSTM) is a recurrent neural network (RNN) architecture that has been designed to address the vanishing and exploding gradient problems of conventional RNNs. Unlike feedforward neural networks, RNNs have cyclic connections making them powerful for modeling sequences. They have been successfully used for sequence labeling and sequence prediction tasks, such as handwriting recognition, language modeling, phonetic labeling of acoustic frames. However, in contrast to the deep neural networks, the use of RNNs in speech recognition has been limited to phone recognition in small scale tasks. In this paper, we present novel LSTM based RNN architectures which make more effective use of model parameters to train acoustic models for large vocabulary speech recognition. We train and compare LSTM, RNN and DNN models at various numbers of parameters and configurations. We show that LSTM models converge quickly and give state of the art speech recognition performance for relatively small sized models.
[ { "created": "Wed, 5 Feb 2014 19:01:51 GMT", "version": "v1" } ]
2014-02-06
[ [ "Sak", "Haşim", "" ], [ "Senior", "Andrew", "" ], [ "Beaufays", "Françoise", "" ] ]
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1402.1132
Jean-Philippe Groby
Jean-Philippe Groby (LAUM), Benoit Nennig (LISMMA), Cl\'ement Lagarrigue (LAUM), Bruno Brouard (LAUM), Olivier Dazel (LAUM), Vincent Tournat (LAUM)
Using simple shape three-dimensional inclusions to enhance porous layer absorption
Submitted version to Journal of the Acoustical Society of America in June 2013. A revised version has been resubmitted in February 2014
null
10.1121/1.4892760
null
physics.class-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The absorption properties of a metaporous material made of non-resonant simple shape three-dimensional inclusions (cube, cylinder, sphere, cone and torus) embedded in a rigidly backed rigid frame porous material is studied. A nearly total absorption can be obtained for a frequency lower than the quarter-wavelength resonance frequency due to the excitation of a trapped mode. To be correctly excited, this mode requires a filling fraction larger in the three-dimensions than in the two-dimensions for purely convex (cube, cylinder, sphere, and cone) shapes. At low frequencies, a cube is found to be the best purely convex inclusion shape to embed in a cubic unit cell, while the embedment of a sphere or a cone cannot lead to an optimal absorption for some porous materials. At fixed position of purely convex shape inclusion barycentre, the absorption coefficient only depends on and filling fraction and does not depend on the shape below the Bragg frequency arising from the interaction between the inclusion and its image with respect to the rigid backing. The influence of the angle of incidence is also shown. The results, in particular the excitation of the trapped mode, are validated experimentally in case of cubic inclusions.
[ { "created": "Wed, 5 Feb 2014 19:20:35 GMT", "version": "v1" } ]
2015-06-18
[ [ "Groby", "Jean-Philippe", "", "LAUM" ], [ "Nennig", "Benoit", "", "LISMMA" ], [ "Lagarrigue", "Clément", "", "LAUM" ], [ "Brouard", "Bruno", "", "LAUM" ], [ "Dazel", "Olivier", "", "LAUM" ], [ "Tournat", "Vincent", "", "LAUM" ] ]
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1402.1133
Irmgard Frank
Irmgard Frank
On the Classical Description of Nuclear Motion
3 pages
null
null
null
physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Severe methodological and numerical problems of the traditional quantum mechanical approach to the description of molecular systems are outlined. To overcome these, a simple alternative to the Born-Oppenheimer approximation is presented on the basis of taking the nuclei as classical particles.
[ { "created": "Wed, 5 Feb 2014 19:21:53 GMT", "version": "v1" } ]
2014-02-06
[ [ "Frank", "Irmgard", "" ] ]
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1402.1137
Sami Akin
Sami Akin
Security in Cognitive Radio Networks
Submitted to CISS 2014
null
null
null
cs.IT cs.CR math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we investigate the information-theoretic security by modeling a cognitive radio wiretap channel under quality-of-service (QoS) constraints and interference power limitations inflicted on primary users (PUs). We initially define four different transmission scenarios regarding channel sensing results and their correctness. We provide effective secure transmission rates at which a secondary eavesdropper is refrained from listening to a secondary transmitter (ST). Then, we construct a channel state transition diagram that characterizes this channel model. We obtain the effective secure capacity which describes the maximum constant buffer arrival rate under given QoS constraints. We find out the optimal transmission power policies that maximize the effective secure capacity, and then, we propose an algorithm that, in general, converges quickly to these optimal policy values. Finally, we show the performance levels and gains obtained under different channel conditions and scenarios. And, we emphasize, in particular, the significant effect of hidden-terminal problem on information-theoretic security in cognitive radios.
[ { "created": "Wed, 5 Feb 2014 19:30:32 GMT", "version": "v1" } ]
2014-02-06
[ [ "Akin", "Sami", "" ] ]
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1402.1141
Carlos Pedro dos Santos Gon\c{c}alves
Carlos Pedro Gon\c{c}alves
Quantum Cybernetics and Complex Quantum Systems Science - A Quantum Connectionist Exploration
null
null
null
null
cs.NE cond-mat.dis-nn quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Quantum cybernetics and its connections to complex quantum systems science is addressed from the perspective of complex quantum computing systems. In this way, the notion of an autonomous quantum computing system is introduced in regards to quantum artificial intelligence, and applied to quantum artificial neural networks, considered as autonomous quantum computing systems, which leads to a quantum connectionist framework within quantum cybernetics for complex quantum computing systems. Several examples of quantum feedforward neural networks are addressed in regards to Boolean functions' computation, multilayer quantum computation dynamics, entanglement and quantum complementarity. The examples provide a framework for a reflection on the role of quantum artificial neural networks as a general framework for addressing complex quantum systems that perform network-based quantum computation, possible consequences are drawn regarding quantum technologies, as well as fundamental research in complex quantum systems science and quantum biology.
[ { "created": "Wed, 5 Feb 2014 19:48:24 GMT", "version": "v1" } ]
2014-02-06
[ [ "Gonçalves", "Carlos Pedro", "" ] ]
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1402.1142
Riccardo Hertel
Christian Andreas, Sebastian Gliga, Riccardo Hertel
Numerical micromagnetism of strong inhomogeneities
null
null
10.1016/j.jmmm.2014.02.097
null
physics.comp-ph cond-mat.mtrl-sci
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The size of micromagnetic structures, such as domain walls or vortices, is comparable to the exchange length of the ferromagnet. Both, the exchange length of the stray field $l_s$ and the magnetocrystalline exchange length $l_k$ are material-dependent quantities that usually lie in the nanometer range. This emphasizes the theoretical challenges associated with the mesoscopic nature of micromagnetism: the magnetic structures are much larger than the atomic lattice constant, but at the same time much smaller than the sample size. In computer simulations, the smallest exchange length serves as an estimate for the largest cell size admissible to prevent appreciable discretization errors. This general rule is not valid in special situations where the magnetization becomes particularly inhomogeneous. When such strongly inhomogeneous structures develop, micromagnetic simulations inevitably contain systematic and numerical errors. It is suggested to combine micromagnetic theory with a Heisenberg model to resolve such problems. We analyze cases where strongly inhomogeneous structures pose limits to standard micromagnetic simulations, arising from fundamental aspects as well as from numerical drawbacks.
[ { "created": "Wed, 5 Feb 2014 19:54:04 GMT", "version": "v1" } ]
2015-06-18
[ [ "Andreas", "Christian", "" ], [ "Gliga", "Sebastian", "" ], [ "Hertel", "Riccardo", "" ] ]
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1402.1147
Su-Peng Yu
S.-P. Yu, J. D. Hood, J. A. Muniz, M. J. Martin, Richard Norte, C.-L. Hung, Se\'an M. Meenehan, Justin D. Cohen, Oskar Painter, and H. J. Kimble
Nanowire photonic crystal waveguides for single-atom trapping and strong light-matter interactions
null
null
10.1063/1.4868975
null
physics.optics physics.atom-ph quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a comprehensive study of dispersion-engineered nanowire photonic crystal waveguides suitable for experiments in quantum optics and atomic physics with optically trapped atoms. Detailed design methodology and specifications are provided, as are the processing steps used to create silicon nitride waveguides of low optical loss in the near-IR. Measurements of the waveguide optical properties and power-handling capability are also presented.
[ { "created": "Wed, 5 Feb 2014 20:14:33 GMT", "version": "v1" } ]
2015-06-18
[ [ "Yu", "S. -P.", "" ], [ "Hood", "J. D.", "" ], [ "Muniz", "J. A.", "" ], [ "Martin", "M. J.", "" ], [ "Norte", "Richard", "" ], [ "Hung", "C. -L.", "" ], [ "Meenehan", "Seán M.", "" ], [ "Cohen", "Justin D.", "" ], [ "Painter", "Oskar", "" ], [ "Kimble", "H. J.", "" ] ]
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1402.1151
Wojciech Biega\'nski
Wojciech Biega\'nski and Andrzej Kasi\'nski
Image Acquisition in an Underwater Vision System with NIR and VIS Illumination
null
Computer Science & Information Technology, Volume 4, Number 1, 2014, pp. 215-224
null
null
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The paper describes the image acquisition system able to capture images in two separated bands of light, used to underwater autonomous navigation. The channels are: the visible light spectrum and near infrared spectrum. The characteristics of natural, underwater environment were also described together with the process of the underwater image creation. The results of an experiment with comparison of selected images acquired in these channels are discussed.
[ { "created": "Wed, 5 Feb 2014 20:18:26 GMT", "version": "v1" } ]
2014-02-06
[ [ "Biegański", "Wojciech", "" ], [ "Kasiński", "Andrzej", "" ] ]
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1402.1156
Pavel Naumov
Pavel Naumov and Margaret Protzman
Equilibria Interchangeability in Cellular Games
null
null
null
null
cs.GT math.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The notion of interchangeability has been introduced by John Nash in one of his original papers on equilibria. This paper studies properties of Nash equilibria interchangeability in cellular games that model behavior of infinite chain of homogeneous economic agents. The paper shows that there are games in which strategy of any given player is interchangeable with strategies of players in an arbitrary large neighborhood of the given player, but is not interchangeable with the strategy of a remote player outside of the neighborhood. The main technical result is a sound and complete logical system describing universal properties of interchangeability common to all cellular games.
[ { "created": "Wed, 5 Feb 2014 20:32:28 GMT", "version": "v1" }, { "created": "Fri, 7 Feb 2014 03:55:40 GMT", "version": "v2" } ]
2014-02-10
[ [ "Naumov", "Pavel", "" ], [ "Protzman", "Margaret", "" ] ]
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1402.1161
Claudio Conti
Nicola Bulso and Claudio Conti
Effective dissipation and nonlocality induced by nonparaxiality
8 pages, 6 figures
Phys. Rev. A 89, 023804 (2014)
10.1103/PhysRevA.89.023804
null
physics.optics nlin.PS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We investigate beam diffraction and spatial modulation instability of coherent light beams propagating in the non-paraxial regime in a nonlinear Kerr medium. We study the instability of plane wave solutions in terms of the degree of non-paraxiality, beyond the regime of validity of the nonlinear Schroedinger equation. We also numerically analyze the way non-paraxial terms breaks the integrability and affect the periodical evolution of higher order soliton solutions. We discuss non-locality and effective dissipation introduced by the non-linear coupling with evanescent waves.
[ { "created": "Wed, 5 Feb 2014 16:58:34 GMT", "version": "v1" } ]
2014-02-07
[ [ "Bulso", "Nicola", "" ], [ "Conti", "Claudio", "" ] ]
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1402.1162
Roberto Le\'on-Montiel
R. de J. Le\'on-Montiel, J. Svozil\'ik, and Juan P. Torres
Generation of a tunable environment for electrical oscillator systems
null
Phys. Rev. E 90, 012108 (2014)
10.1103/PhysRevE.90.012108
null
physics.class-ph physics.bio-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Many physical, chemical and biological systems can be modeled by means of random-frequency harmonic oscillator systems. Even though the noise-free evolution of harmonic oscillator systems can be easily implemented, the way to experimentally introduce, and control, noise effects due to a surrounding environment remains a subject of lively interest. Here, we experimentally demonstrate a setup that provides a unique tool to generate a fully tunable environment for classical electrical oscillator systems. We illustrate the operation of the setup by implementing the case of a damped random-frequency harmonic oscillator. The high degree of tunability and control of our scheme is demonstrated by gradually modifying the statistics of the oscillator's frequency fluctuations. This tunable system can readily be used to experimentally study interesting noise effects, such as noise-induced transitions in systems driven by multiplicative noise, and noise-induced transport, a phenomenon that takes place in quantum and classical coupled oscillator networks.
[ { "created": "Wed, 5 Feb 2014 17:18:29 GMT", "version": "v1" }, { "created": "Fri, 11 Apr 2014 13:25:32 GMT", "version": "v2" }, { "created": "Thu, 10 Jul 2014 08:30:00 GMT", "version": "v3" } ]
2014-07-11
[ [ "León-Montiel", "R. de J.", "" ], [ "Svozilík", "J.", "" ], [ "Torres", "Juan P.", "" ] ]
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1402.1170
Delia Tosi
Delia Tosi (on behalf of the EXO Collaboration)
The search for neutrino-less double-beta decay: summary of current experiments
10 pages, 3 figures. Proceedings of plenary talk at ICATPP 2013
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null
null
nucl-ex physics.ins-det
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The search for neutrino-less double-beta decay has been a very active field of research in the last decade. Neutrino-less double-beta decay may answer essential open questions in neutrino physics. While double-beta decay accompanied by the emission of two neutrinos is allowed by the Standard Model, the neutrino-less process requires neutrinos to be Majorana particles. Detecting this decay could determine the nature of neutrinos, the neutrino effective mass, and the mass hierarchy. Xenon-136 and germanium-76 experiments currently have the best sensitivities. For both isotopes the lifetime of neutrino-less double-beta decay has been determined to be longer than 10^25 years, several orders of magnitude slower than the slowest process that has been detected. In this paper the basic theory of neutrino-less double-beta decay and its relationship to the neutrino mass are discussed. A review of the experimental efforts underway to measure this decay is presented, along with the status and sensitivity of current and near future searches.
[ { "created": "Wed, 5 Feb 2014 21:00:16 GMT", "version": "v1" } ]
2019-08-14
[ [ "Tosi", "Delia", "", "on behalf of the EXO Collaboration" ] ]
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1402.1188
Adrian Kuhn
Adrian Kuhn and Robert DeLine
On Designing Better Tools for Learning APIs
Published at ICSE 2012
null
10.1109/SUITE.2012.6225476
null
cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Modern software development requires a large investment in learning application programming interfaces (APIs). Recent research found that the learning materials themselves are often inadequate: developers struggle to find answers beyond simple usage scenarios. Solving these problems requires a large investment in tool and search engine development. To understand where further investment would be most useful, we ran a study with 19 professional developers to understand what a solution might look like, free of technical constraints. In this paper, we report on design implications of tools for API learning, grounded in the reality of the professional developers themselves. The reoccurring themes in the participants' feedback were trustworthiness, confidentiality, information overload and the need for code examples as first-class documentation artifacts.
[ { "created": "Wed, 5 Feb 2014 21:29:28 GMT", "version": "v1" } ]
2014-02-07
[ [ "Kuhn", "Adrian", "" ], [ "DeLine", "Robert", "" ] ]
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1402.1191
Xing Shi Cai
Xing Shi Cai, Luc Devroye
The Analysis of Kademlia for random IDs
15 pages. 2 figures
null
10.1080/15427951.2015.1051674
null
cs.DS cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Kademlia is the de facto standard searching algorithm for P2P (peer-to-peer) networks on the Internet. In our earlier work, we introduced two slightly different models for Kademlia and studied how many steps it takes to search for a target node by using Kademlia's searching algorithm. The first model, in which nodes of the network are labelled with deterministic IDs, had been discussed in that paper. The second one, in which nodes are labelled with random IDs, which we call the Random ID Model, was only briefly mentioned. Refined results with detailed proofs for this model are given in this paper. Our analysis shows that with high probability it takes about $c \log n$ steps to locate any node, where $n$ is the total number of nodes in the network and $c$ is a constant that does not depend on $n$.
[ { "created": "Wed, 5 Feb 2014 21:37:29 GMT", "version": "v1" }, { "created": "Tue, 12 May 2015 14:07:52 GMT", "version": "v2" } ]
2020-04-21
[ [ "Cai", "Xing Shi", "" ], [ "Devroye", "Luc", "" ] ]
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1402.1194
G\'abor R\'etv\'ari
G\'abor R\'etv\'ari, J\'anos Tapolcai, Attila K\H{o}r\"osi, Andr\'as Majd\'an, Zal\'an Heszberger
Compressing IP Forwarding Tables: Towards Entropy Bounds and Beyond
null
ACM SIGCOMM 2013. 111-122
10.1145/2486001.2486009
null
cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Lately, there has been an upsurge of interest in compressed data structures, aiming to pack ever larger quantities of information into constrained memory without sacrificing the efficiency of standard operations, like random access, search, or update. The main goal of this paper is to demonstrate how data compression can benefit the networking community, by showing how to squeeze the IP Forwarding Information Base (FIB), the giant table consulted by IP routers to make forwarding decisions, into information-theoretical entropy bounds, with essentially zero cost on longest prefix match and FIB update. First, we adopt the state-of-the-art in compressed data structures, yielding a static entropy-compressed FIB representation with asymptotically optimal lookup. Then, we re-design the venerable prefix tree, used commonly for IP lookup for at least 20 years in IP routers, to also admit entropy bounds and support lookup in optimal time and update in nearly optimal time. Evaluations on a Linux kernel prototype indicate that our compressors encode a FIB comprising more than 440K prefixes to just about 100--400 KBytes of memory, with a threefold increase in lookup throughput and no penalty on FIB updates. This technical report contains a number of important corrections and revisions to the original manuscript.
[ { "created": "Wed, 5 Feb 2014 21:45:26 GMT", "version": "v1" } ]
2014-02-07
[ [ "Rétvári", "Gábor", "" ], [ "Tapolcai", "János", "" ], [ "Kőrösi", "Attila", "" ], [ "Majdán", "András", "" ], [ "Heszberger", "Zalán", "" ] ]
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1402.1205
David C. Johnston
David C. Johnston
Thermodynamic Properties of the van der Waals Fluid
41 pages, 34 figures, 7 tables
eBook: "Advances in Thermodynamics of the van der Waals Fluid", David C. Johnston (Morgan&Claypool, San Rafael, CA, 2014)
10.1088/978-1-627-05532-1
null
cond-mat.soft physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The van der Waals (vdW) theory of fluids is the first and simplest theory that takes into account interactions between the particles of a system that result in a phase transition versus temperature. Combined with Maxwell's construction, this mean-field theory predicts the conditions for equilibrium coexistence between the gas and liquid phases and the first-order transition between them. However, important properties of the vdW fluid have not been systematically investigated. Here we report a comprehensive study of these properties. Ambiguities about the physical interpretation of the Boyle temperature and the influence of the vdW molecular interactions on the pressure of the vdW gas are resolved. Thermodynamic variables and properties are formulated in reduced units that allow all properties to be expressed as laws of corresponding states that apply to all vdW fluids. Lekner's parametric solution for the vdW gas-liquid coexistence curve in the pressure-temperature plane and related thermodynamic properties [Am. J. Phys. 50, 161 (1982)] is explained and significantly extended. Hysteresis in the first-order transition temperature on heating and cooling is examined and the maximum degrees of superheating and supercooling determined. The latent heat of vaporization and the entropy change on crossing the coexistence curve are investigated. The temperature dependences of the isothermal compressibility, thermal expansion coefficient and heat capacity at constant pressure for a range of pressures above, at and below the critical pressure are systematically studied from numerical calculations including their critical behaviors and their discontinuities on crossing the coexistence curve. Joule-Thomson expansion of the vdW gas is investigated in detail and the pressure and temperature conditions for liquifying a vdW gas on passing through the throttle are determined.
[ { "created": "Wed, 5 Feb 2014 22:17:43 GMT", "version": "v1" } ]
2018-02-12
[ [ "Johnston", "David C.", "" ] ]
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1402.1207
Paul Berceau
Paul Berceau and Leo Hollberg
Laser time-transfer and space-time reference in orbit
Presented at the Sixth Meeting on CPT and Lorentz Symmetry, Bloomington, Indiana, June 17-21, 2013
null
10.1142/9789814566438_0055
null
physics.optics astro-ph.IM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A high performance Space-Time Reference in orbit could be realized using a stable atomic clock in a precisely defined orbit and linking that to high accuracy atomic clocks on the ground using a laser based time-transfer link. This would enhance performance of existing systems and provide unique capabilities in navigation, precise timing, earth sciences, geodesy and the same approach could provide a platform for testing fundamental physics in space. Precise laser time- and frequency-transfer from the ground to an orbiting satellite would make it possible to improve upon the current state of the art in timing (about 1 to 30 ns achieved with GPS) by roughly a factor of 1000 to the 1 ps level.
[ { "created": "Wed, 5 Feb 2014 22:23:16 GMT", "version": "v1" } ]
2017-08-23
[ [ "Berceau", "Paul", "" ], [ "Hollberg", "Leo", "" ] ]
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1402.1213
Adrien Ickowicz
Adrien Ickowicz
A Statistical Modelling Approach to Detecting Community in Networks
23 pages, 4 figures. arXiv admin note: text overlap with arXiv:physics/0512106, arXiv:1207.0865 by other authors
null
null
null
cs.SI stat.AP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
There has been considerable recent interest in algorithms for finding communities in networks - groups of vertex within which connections are dense (frequent), but between which connections are sparser (rare). Most of the current literature advocates an heuristic approach to the removal of the edges (i.e., removing the links that are less significant using a well-designed function). In this article, we will investigate a technique for uncovering latent communities using a new modelling approach, based on how information spread within a network. It will prove to be easy to use, robust and scalable. It makes supplementary information related to the network/community structure (different communications, consecutive observations) easier to integrate. We will demonstrate the efficiency of our approach by providing some illustrating real-world applications, like the famous Zachary karate club, or the Amazon political books buyers network.
[ { "created": "Wed, 5 Feb 2014 23:14:43 GMT", "version": "v1" } ]
2014-02-07
[ [ "Ickowicz", "Adrien", "" ] ]
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1402.1215
David Messerschmitt
David G. Messerschmitt
Design for minimum energy in starship and interstellar communication
null
null
10.1016/j.actaastro.2014.11.007
null
astro-ph.IM physics.pop-ph
http://creativecommons.org/licenses/by-nc-sa/3.0/
Microwave digital communication at interstellar distances applies to starship and extraterrestrial civilization (SETI and METI) communication. Large distances demand large transmitted power and/or large antennas, while the propagation is transparent over a wide bandwidth. Recognizing a fundamental tradeoff, reduced energy delivered to the receiver at the expense of wide bandwidth (the opposite of terrestrial objectives) is advantageous. Wide bandwidth also results in simpler design and implementation, allowing circumvention of dispersion and scattering arising in the interstellar medium and motion effects and obviating any related processing. The minimum energy delivered to the receiver per bit of information is determined by cosmic microwave background alone. By mapping a single bit onto a carrier burst, the Morse code invented for the telegraph in 1836 comes closer to this minimum energy than approaches used in modern terrestrial radio. Rather than the terrestrial approach of adding phases and amplitudes to increases information capacity while minimizing bandwidth, adding multiple time-frequency locations for carrier bursts increases capacity while minimizing energy per information bit. The resulting location code is extremely simple and yet can approach the minimum energy as bandwidth is expanded. It is consistent with easy discovery, since carrier bursts are energetic and straightforward modifications to post-detection pattern recognition can identify burst patterns. The interstellar coherence hole captures the time and frequency coherence constraints, and observations of the environment by transmitter and receiver constrain the burst parameters and limit the search scope.
[ { "created": "Thu, 6 Feb 2014 00:10:31 GMT", "version": "v1" }, { "created": "Sat, 29 Mar 2014 19:07:58 GMT", "version": "v2" } ]
2015-06-18
[ [ "Messerschmitt", "David G.", "" ] ]
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1402.1216
Jingchao Sun
Jingchao Sun, Rui Zhang, Jinxue Zhang, Yanchao Zhang
TouchIn: Sightless Two-factor Authentication on Multi-touch Mobile Devices
null
null
null
null
cs.CR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Mobile authentication is indispensable for preventing unauthorized access to multi-touch mobile devices. Existing mobile authentication techniques are often cumbersome to use and also vulnerable to shoulder-surfing and smudge attacks. This paper focuses on designing, implementing, and evaluating TouchIn, a two-factor authentication system on multi-touch mobile devices. TouchIn works by letting a user draw on the touchscreen with one or multiple fingers to unlock his mobile device, and the user is authenticated based on the geometric properties of his drawn curves as well as his behavioral and physiological characteristics. TouchIn allows the user to draw on arbitrary regions on the touchscreen without looking at it. This nice sightless feature makes TouchIn very easy to use and also robust to shoulder-surfing and smudge attacks. Comprehensive experiments on Android devices confirm the high security and usability of TouchIn.
[ { "created": "Thu, 6 Feb 2014 00:35:37 GMT", "version": "v1" } ]
2014-02-07
[ [ "Sun", "Jingchao", "" ], [ "Zhang", "Rui", "" ], [ "Zhang", "Jinxue", "" ], [ "Zhang", "Yanchao", "" ] ]
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1402.1219
Brian Tierney
Brian B. Tierney and Anthony Grbic
Planar Shielded-Loop Resonators
null
null
10.1109/TAP.2014.2314305
null
cs.OH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The design and analysis of planar shielded-loop resonators for use in wireless non-radiative power transfer systems is presented. The difficulties associated with coaxial shielded-loop resonators for wireless power transfer are discussed and planar alternatives are proposed. The currents along these planar structures are analyzed and first-order design equations are presented in the form of a circuit model. In addition, the planar structures are simulated and fabricated. Planar shielded-loop resonators are compact and simple to fabricate. Moreover, they are well-suited for printed circuit board designs or integrated circuits
[ { "created": "Thu, 6 Feb 2014 00:50:00 GMT", "version": "v1" } ]
2015-06-18
[ [ "Tierney", "Brian B.", "" ], [ "Grbic", "Anthony", "" ] ]
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1402.1222
Syen Nik
Syen J. Nik, Rune S. Thing, Richard Watts, Tony Dale, Bryn Currie, Juergen Meyer
Monte Carlo validation of optimal material discrimination using spectral x-ray imaging
null
null
10.1088/1748-0221/9/08/T08003
null
physics.med-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The validation of a previous work on the optimization of material discrimination in spectral x-ray imaging is reported. Using Monte Carlo simulations based on the BEAMnrc package, material decomposition was performed on the projection images of phantoms containing up to three materials. The simulated projection data was first decomposed into material basis images by minimizing the z-score between expected and simulated counts. Statistical analysis was performed for the pixels within the region-of-interest consisting of contrast material(s) in the BEAMnrc simulations. With the consideration of scattered radiation and a realistic scanning geometry, the theoretical optima of energy bin borders provided by the algorithm were shown to have an accuracy of $\pm$2 keV for the decomposition of 2 and 3 materials. Finally, the signal-to-noise ratio predicted by the theoretical model was also validated. The counts per pixel needed for achieving a specific imaging aim can therefore be estimated using the validated model.
[ { "created": "Thu, 6 Feb 2014 01:04:12 GMT", "version": "v1" }, { "created": "Thu, 26 Jun 2014 11:38:10 GMT", "version": "v2" }, { "created": "Tue, 1 Jul 2014 00:14:42 GMT", "version": "v3" } ]
2015-06-18
[ [ "Nik", "Syen J.", "" ], [ "Thing", "Rune S.", "" ], [ "Watts", "Richard", "" ], [ "Dale", "Tony", "" ], [ "Currie", "Bryn", "" ], [ "Meyer", "Juergen", "" ] ]
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1402.1225
Kazuyuki Fujii
Kazuyuki Fujii (YCU)
Comment on "Epidemiological modeling of online social network dynamics"
Latex ; 6 pages ; no figure ; minor changes
Far East Journal of Mathematical Education, 12(2014), 179-185
null
null
physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this comment we give a simple analytic approximate solution to the infectious recovery SIR (irSIR) model given by J. Cannarella and J. A. Spechler arXiv:1401.4208, which is a variant of the traditional SIR model.
[ { "created": "Thu, 6 Feb 2014 01:41:37 GMT", "version": "v1" }, { "created": "Tue, 18 Feb 2014 00:14:20 GMT", "version": "v2" } ]
2014-05-27
[ [ "Fujii", "Kazuyuki", "", "YCU" ] ]
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1402.1229
Hiroki Sayama
Jae Kyun Shin, Hiroki Sayama
Theoretical investigation on the Schelling's critical neighborhood demand
15 pages, 6 figures
Communications in Nonlinear Science and Numerical Simulation, 19, 1417-1423, 2014
10.1016/j.cnsns.2013.08.038
null
nlin.AO physics.soc-ph q-bio.PE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We derived the critical neighborhood demand in the Schelling's segregation model by studying the conditions for which a chain reaction of migrations of unsatisfied agents occurs. The essence of Schelling dynamics was approximated in two simplified models: (1) a random walk model for the initial stage of the migrations to illustrate the power-law behavior of chain reaction lengths under critical conditions, and (2) a two-room model for the whole process to represent a non-spatial version of segregation dynamics in the Schelling model. Our theoretical results showed good agreements with numerical results obtained from agent-based simulations.
[ { "created": "Thu, 6 Feb 2014 02:08:59 GMT", "version": "v1" } ]
2014-02-07
[ [ "Shin", "Jae Kyun", "" ], [ "Sayama", "Hiroki", "" ] ]
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