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1402.2508
Steffen G\"orzig
Steffen G\"orzig
Data Compaction - Compression without Decompression
11 pages
null
null
null
cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Data compaction is a new approach for lossless and lossy compression of read-only array data. The biggest advantage over existing approaches is the possibility to access compressed data without any decompression. This makes data compaction most suitable for systems that could currently not apply compression techniques due to real-time or memory constraints. This is true for the majority of all computers, i.e. a wide range of embedded systems.
[ { "created": "Tue, 11 Feb 2014 14:48:27 GMT", "version": "v1" } ]
2014-02-12
[ [ "Görzig", "Steffen", "" ] ]
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1402.2509
Subha
M.Subha, K.Saravanan
Achieve Better Ranking Accuracy Using CloudRank Framework for Cloud Services
6 pages, 10 figures, Published with International Journal of Engineering Trends and Technology (IJETT)
International Journal of Engineering Trends and Technology (IJETT) 6(6):307-312, December 2013
null
null
cs.DC cs.IR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Building high quality cloud applications becomes an urgently required research problem. Nonfunctional performance of cloud services is usually described by quality-of-service (QoS). In cloud applications, cloud services are invoked remotely by internet connections. The QoS Ranking of cloud services for a user cannot be transferred directly to another user, since the locations of the cloud applications are quite different. Personalized QoS Ranking is required to evaluate all candidate services at the user - side but it is impractical in reality. To get QoS values, the service candidates are usually required and it is very expensive. To avoid time consuming and expensive realworld service invocations, this paper proposes a CloudRank framework which predicts the QoS ranking directly without predicting the corresponding QoS values. This framework provides an accurate ranking but the QoS values are same in both algorithms so, an optimal VM allocation policy is used to improve the QoS performance of cloud services and it also provides better ranking accuracy than CloudRank2 algorithm.
[ { "created": "Tue, 11 Feb 2014 14:51:11 GMT", "version": "v1" } ]
2014-02-12
[ [ "Subha", "M.", "" ], [ "Saravanan", "K.", "" ] ]
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1402.2510
Hygor Piaget Melo M.Sc.
Hygor Piaget M. Melo, Andr\'e A. Moreira, Hern\'an A. Makse, Jos\'e S. Andrade Jr
Statistical Signs of Social Influence on Suicides
7 pages, 4 figures
null
null
null
stat.AP physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Certain currents in sociology consider society as being composed of autonomous individuals with independent psychologies. Others, however, deem our actions as strongly influenced by the accepted standards of social behavior. The later view was central to the positivist conception of society when in 1887 \'Emile Durkheim published his monograph Suicide (Durkheim, 1897). By treating the suicide as a social fact, Durkheim envisaged that suicide rates should be determined by the connections (or the lack of them) between people and society. Under the same framework, Durkheim considered that crime is bound up with the fundamental conditions of all social life and serves a social function. In this sense, and regardless of its extremely deviant nature, crime events are somehow capable to release certain social tensions and so have a purging effect in society. The social effect on the occurrence of homicides has been previously substantiated (Bettencourt et al., 2007; Alves et al., 2013), and confirmed here, in terms of a superlinear scaling relation: by doubling the population of a Brazilian city results in an average increment of 135 % in the number of homicides, rather than the expected isometric increase of 100 %, as found, for example, for the mortality due to car crashes. Here we present statistical signs of the social influence on the suicide occurrence in cities. Differently from homicides (superlinear) and fatal events in car crashes (isometric), we find sublinear scaling behavior between the number of suicides and city population, with allometric power-law exponents, $\beta = 0.836 \pm 0.009$ and $0.870 \pm 0.002$, for all cities in Brazil and US, respectively. The fact that the frequency of suicides is disproportionately small for larger cities reveals a surprisingly beneficial aspect of living and interacting in larger and more complex social networks.
[ { "created": "Tue, 11 Feb 2014 14:53:21 GMT", "version": "v1" } ]
2014-02-12
[ [ "Melo", "Hygor Piaget M.", "" ], [ "Moreira", "André A.", "" ], [ "Makse", "Hernán A.", "" ], [ "Andrade", "José S.", "Jr" ] ]
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1402.2511
Eugenia Sironi
Eugenia Sironi
Type Theory in Ludics
arXiv admin note: text overlap with arXiv:1307.1028 by other authors
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math.LO cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present some first steps in the more general setting of the interpretation of dependent type theory in Ludics. The framework is the following: a (Martin-Lof) type A is represented by a behaviour (which corresponds to a formula) in such a way that canonical elements of A are interpreted in a set that is principal for the behaviour, where principal means in some way a minimal generator. We introduce some notions on Ludics and the interpretation of Martin-Lof rules. Then we propose a representation for simple types in Ludics, i.e., natural numbers, lists, the arrow construction and the usual constructors.
[ { "created": "Tue, 11 Feb 2014 14:53:50 GMT", "version": "v1" } ]
2014-02-12
[ [ "Sironi", "Eugenia", "" ] ]
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1402.2515
Oleg Markin
O. Markin
Backgrounds at future linear colliders
null
null
null
null
physics.ins-det hep-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A brief review of the background for experiments at future electron-positron linear colliders is done. Two sources of background are discussed: the beam delivery system and the interaction point. The abundance of background muons, neutrons, photons and electron-positron pairs is quoted for different sub-detectors and both background sources. The background caused by the beamstrahlung is described in more detail. Space distributions are sketched and the impact on calorimeters is discussed for the background neutrons.
[ { "created": "Tue, 11 Feb 2014 15:07:32 GMT", "version": "v1" } ]
2014-02-12
[ [ "Markin", "O.", "" ] ]
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1402.2523
Julius Ruseckas
J. Ruseckas and B. Kaulakys
Scaling properties of signals as origin of 1/f noise
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cond-mat.stat-mech physics.data-an
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
There are several mathematical models yielding 1/f noise. For example, 1/f spectrum can be obtained from stochastic sequence of pulses having power-law distribution of pulse durations or from nonlinear stochastic differential equations. We show that a couple of seemingly different models exhibiting 1/f spectrum are due to the similar scaling properties of the signals. In addition, we demonstrate a connection between signals with the power-law behavior of the power spectral density generated by the nonlinear stochastic differential equations and modeled by a sequence of random different pulses. An approximation of solutions of the nonlinear stochastic differential equations by the sequence of pulses correctly reproduces the power-law parts of the probability density function and of the power spectral density. This connection provides further insights into the origin of 1/f noise.
[ { "created": "Tue, 11 Feb 2014 15:23:32 GMT", "version": "v1" } ]
2014-02-12
[ [ "Ruseckas", "J.", "" ], [ "Kaulakys", "B.", "" ] ]
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1402.2531
Sangeetha Abdu Jyothi
Sangeetha Abdu Jyothi, Ankit Singla, P. Brighten Godfrey, Alexandra Kolla
Measuring and Understanding Throughput of Network Topologies
null
null
null
null
cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
High throughput is of particular interest in data center and HPC networks. Although myriad network topologies have been proposed, a broad head-to-head comparison across topologies and across traffic patterns is absent, and the right way to compare worst-case throughput performance is a subtle problem. In this paper, we develop a framework to benchmark the throughput of network topologies, using a two-pronged approach. First, we study performance on a variety of synthetic and experimentally-measured traffic matrices (TMs). Second, we show how to measure worst-case throughput by generating a near-worst-case TM for any given topology. We apply the framework to study the performance of these TMs in a wide range of network topologies, revealing insights into the performance of topologies with scaling, robustness of performance across TMs, and the effect of scattered workload placement. Our evaluation code is freely available.
[ { "created": "Tue, 11 Feb 2014 15:41:31 GMT", "version": "v1" }, { "created": "Wed, 19 Mar 2014 22:16:52 GMT", "version": "v2" }, { "created": "Mon, 9 Feb 2015 12:11:31 GMT", "version": "v3" }, { "created": "Tue, 15 Nov 2016 04:17:21 GMT", "version": "v4" } ]
2016-11-16
[ [ "Jyothi", "Sangeetha Abdu", "" ], [ "Singla", "Ankit", "" ], [ "Godfrey", "P. Brighten", "" ], [ "Kolla", "Alexandra", "" ] ]
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Measuring and Understanding Throughput of Network Topologies
http://arxiv.org/abs/1402.2531v4
http://arxiv.org/pdf/1402.2531v4.pdf
https://github.com/ankitsingla/topobench
true
true
https://paperswithcode.com/paper/measuring-and-understanding-throughput-of
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1402.2536
Amandeep Singh
Amandeep Singh, Balwinder Singh
Design and Implementation of Bit Transition Counter
International Journal Paper
Circuits and Systems: An International Journal (CSIJ), Vol. 1, No. 1, January 2014
null
null
cs.AR
http://creativecommons.org/licenses/by/3.0/
In today VLSI system design, power consumption is gaining more attention as compared to performance and area. This is due to battery life in portable devices and operating frequency of the design. Power consumption mainly consists of static power, dynamic power, leakage power and short circuit power. Dynamic power is dominant among all which depends on many factors viz. power supply, load capacitance and frequency. Switching activity also affects dynamic power consumption of bus which is determined by calculating the number of bit transitions on bus. The purpose of this paper is to design a bit transition counter which can be used to calculate the switching activity of the circuit nodes. The novel feature is that it can be inserted at any node of the circuit, thus helpful for calculating power consumption of bus.
[ { "created": "Tue, 11 Feb 2014 15:51:52 GMT", "version": "v1" } ]
2014-02-12
[ [ "Singh", "Amandeep", "" ], [ "Singh", "Balwinder", "" ] ]
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1402.2541
Jelena Vuckovic
Jelena Vuckovic
Quantum optics and cavity QED with quantum dots in photonic crystals
Lectures given at Les Houches 101th summer school on "Quantum Optics and Nanophotonics," August 2013. To be published by Oxford University Press. 37 pages
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quant-ph cond-mat.mes-hall physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This chapter will primarily focus on the studies of quantum optics with semiconductor, epitaxially grown quantum dots embedded in photonic crystal cavities. We will start by giving brief introductions into photonic crystals and quantum dots, then proceed with the introduction to cavity quantum electrodynamics (QED) effects, with a particular emphasis on the demonstration of these effects on the quantum dot-photonic crystal platform. Finally, we will focus on the applications of such cavity QED effects.
[ { "created": "Tue, 11 Feb 2014 16:04:04 GMT", "version": "v1" } ]
2014-02-12
[ [ "Vuckovic", "Jelena", "" ] ]
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1402.2543
Jukka Suomela
Juho Hirvonen, Joel Rybicki, Stefan Schmid, Jukka Suomela
Large Cuts with Local Algorithms on Triangle-Free Graphs
1+17 pages, 8 figures
null
null
null
cs.DC cs.DM cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the problem of finding large cuts in $d$-regular triangle-free graphs. In prior work, Shearer (1992) gives a randomised algorithm that finds a cut of expected size $(1/2 + 0.177/\sqrt{d})m$, where $m$ is the number of edges. We give a simpler algorithm that does much better: it finds a cut of expected size $(1/2 + 0.28125/\sqrt{d})m$. As a corollary, this shows that in any $d$-regular triangle-free graph there exists a cut of at least this size. Our algorithm can be interpreted as a very efficient randomised distributed algorithm: each node needs to produce only one random bit, and the algorithm runs in one synchronous communication round. This work is also a case study of applying computational techniques in the design of distributed algorithms: our algorithm was designed by a computer program that searched for optimal algorithms for small values of $d$.
[ { "created": "Tue, 11 Feb 2014 16:06:35 GMT", "version": "v1" } ]
2014-02-12
[ [ "Hirvonen", "Juho", "" ], [ "Rybicki", "Joel", "" ], [ "Schmid", "Stefan", "" ], [ "Suomela", "Jukka", "" ] ]
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1402.2544
Yogesh N. Joglekar
Charles Liang, Derek D. Scott, and Yogesh N. Joglekar
PT-restoration via increased loss-gain in PT-symmetric Aubry-Andre model
5 pages, 4 figures
Phys. Rev. A 89, 030102(R) 2014
10.1103/PhysRevA.89.030102
null
quant-ph physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In systems with ``balanced loss and gain'', the PT-symmetry is broken by increasing the non-hermiticity or the loss-gain strength. We show that finite lattices with oscillatory, PT-symmetric potentials exhibit a new class of PT-symmetry breaking and restoration. We obtain the PT phase diagram as a function of potential periodicity, which also controls the location complex eigenvalues in the lattice spectrum. We show that the sum of PT-potentials with nearby periodicities leads to PT-symmetry restoration, where the system goes from a PT-broken state to a PT-symmetric state as the average loss-gain strength is increased. We discuss the implications of this novel transition for the propagation of a light in an array of coupled waveguides.
[ { "created": "Tue, 11 Feb 2014 16:14:02 GMT", "version": "v1" } ]
2014-03-18
[ [ "Liang", "Charles", "" ], [ "Scott", "Derek D.", "" ], [ "Joglekar", "Yogesh N.", "" ] ]
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1402.2549
Jukka Suomela
Miikka Hilke, Christoph Lenzen, Jukka Suomela
Local Approximability of Minimum Dominating Set on Planar Graphs
3 pages, 1 figure
null
null
null
cs.DC cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We show that there is no deterministic local algorithm (constant-time distributed graph algorithm) that finds a $(7-\epsilon)$-approximation of a minimum dominating set on planar graphs, for any positive constant $\epsilon$. In prior work, the best lower bound on the approximation ratio has been $5-\epsilon$; there is also an upper bound of $52$.
[ { "created": "Tue, 11 Feb 2014 16:24:05 GMT", "version": "v1" } ]
2014-02-12
[ [ "Hilke", "Miikka", "" ], [ "Lenzen", "Christoph", "" ], [ "Suomela", "Jukka", "" ] ]
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1402.2551
Aishwarya B U
Aishwarya B U, Mohammed Saaqib A, Rajashree H R, Vigasini B
Modeling European Options
arXiv admin note: substantial text overlap with arXiv:1311.0438 by other authors
null
null
null
cs.CE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Option contracts can be valued by using the Black-Scholes equation, a partial differential equation with initial conditions. An exact solution for European style options is known. The computation time and the error need to be minimized simultaneously. In this paper, the authors have solved the Black-Scholes equation by employing a reasonably accurate implicit method. Options with known analytic solutions have been evaluated. Furthermore, an overall second order accurate space and time discretization has been accomplished in this paper.
[ { "created": "Tue, 11 Feb 2014 16:31:46 GMT", "version": "v1" } ]
2014-02-12
[ [ "U", "Aishwarya B", "" ], [ "A", "Mohammed Saaqib", "" ], [ "R", "Rajashree H", "" ], [ "B", "Vigasini", "" ] ]
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1402.2552
Jukka Suomela
Juhana Laurinharju, Jukka Suomela
Linial's Lower Bound Made Easy
3 pages, 1 figure
null
null
null
cs.DC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Linial's seminal result shows that any deterministic distributed algorithm that finds a $3$-colouring of an $n$-cycle requires at least $\log^*(n)/2 - 1$ communication rounds. We give a new simpler proof of this theorem.
[ { "created": "Tue, 11 Feb 2014 16:33:07 GMT", "version": "v1" } ]
2014-02-12
[ [ "Laurinharju", "Juhana", "" ], [ "Suomela", "Jukka", "" ] ]
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1402.2560
Antun Balaz
Antun Balaz, Remus Paun, Alexandru I. Nicolin, Sudharsan Balasubramanian, Radha Ramaswamy
Faraday waves in collisionally inhomogeneous Bose-Einstein condensates
11 pages, 5 figures, references updated
Phys. Rev. A 89 (2014) 023609
10.1103/PhysRevA.89.023609
null
cond-mat.quant-gas nlin.PS physics.comp-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the emergence of Faraday waves in cigar-shaped collisionally inhomogeneous Bose-Einstein condensates subject to periodic modulation of the radial confinement. Considering a Gaussian-shaped radially inhomogeneous scattering length, we show through extensive numerical simulations and detailed variational treatment that the spatial period of the emerging Faraday waves increases as the inhomogeneity of the scattering length gets weaker, and that it saturates once the width of the radial inhomogeneity reaches the radial width of the condensate. In the regime of strongly inhomogeneous scattering lengths, the radial profile of the condensate is akin to that of a hollow cylinder, while in the weakly inhomogeneous case the condensate is cigar-shaped and has a Thomas-Fermi radial density profile. Finally, we show that when the frequency of the modulation is close to the radial frequency of the trap, the condensate exhibits resonant waves which are accompanied by a clear excitation of collective modes, while for frequencies close to twice that of the radial frequency of the trap, the observed Faraday waves set in forcefully and quickly destabilize condensates with weakly inhomogeneous two-body interactions.
[ { "created": "Tue, 11 Feb 2014 16:56:54 GMT", "version": "v1" }, { "created": "Thu, 13 Feb 2014 09:39:04 GMT", "version": "v2" } ]
2014-02-14
[ [ "Balaz", "Antun", "" ], [ "Paun", "Remus", "" ], [ "Nicolin", "Alexandru I.", "" ], [ "Balasubramanian", "Sudharsan", "" ], [ "Ramaswamy", "Radha", "" ] ]
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1402.2561
Tiziano Flati
Tiziano Flati, Roberto Navigli
The CQC Algorithm: Cycling in Graphs to Semantically Enrich and Enhance a Bilingual Dictionary
null
Journal Of Artificial Intelligence Research, Volume 43, pages 135-171, 2012
10.1613/jair.3456
null
cs.CL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Bilingual machine-readable dictionaries are knowledge resources useful in many automatic tasks. However, compared to monolingual computational lexicons like WordNet, bilingual dictionaries typically provide a lower amount of structured information, such as lexical and semantic relations, and often do not cover the entire range of possible translations for a word of interest. In this paper we present Cycles and Quasi-Cycles (CQC), a novel algorithm for the automated disambiguation of ambiguous translations in the lexical entries of a bilingual machine-readable dictionary. The dictionary is represented as a graph, and cyclic patterns are sought in the graph to assign an appropriate sense tag to each translation in a lexical entry. Further, we use the algorithms output to improve the quality of the dictionary itself, by suggesting accurate solutions to structural problems such as misalignments, partial alignments and missing entries. Finally, we successfully apply CQC to the task of synonym extraction.
[ { "created": "Sat, 18 Jan 2014 21:08:40 GMT", "version": "v1" } ]
2014-02-12
[ [ "Flati", "Tiziano", "" ], [ "Navigli", "Roberto", "" ] ]
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1402.2562
Nathalie Chaignaud
Nathalie Chaignaud (LITIS), Val\'erie Delavigne (LiDiFra), Maryvonne Holzem (LiDiFra), Jean-Philippe Kotowicz (LITIS), Alain Loisel (LITIS)
\'Etude cognitive des processus de construction d'une requ\^ete dans un syst\`eme de gestion de connaissances m\'edicales
29 pages
Revue Revue Technique et Science Informatiques 29 (2010) 991-1021
null
null
cs.IR cs.CL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This article presents the Cogni-CISMeF project, which aims at improving medical information search in the CISMeF system (Catalog and Index of French-language health resources) by including a conversational agent to interact with the user in natural language. To study the cognitive processes involved during the information search, a bottom-up methodology was adopted. Experimentation has been set up to obtain human dialogs between a user (playing the role of patient) dealing with medical information search and a CISMeF expert refining the request. The analysis of these dialogs underlined the use of discursive evidence: vocabulary, reformulation, implicit or explicit expression of user intentions, conversational sequences, etc. A model of artificial agent is proposed. It leads the user in its information search by proposing to him examples, assistance and choices. This model was implemented and integrated in the CISMeF system. ---- Cet article d\'ecrit le projet Cogni-CISMeF qui propose un module de dialogue Homme-Machine \`a int\'egrer dans le syst\`eme d'indexation de connaissances m\'edicales CISMeF (Catalogue et Index des Sites M\'edicaux Francophones). Nous avons adopt\'e une d\'emarche de mod\'elisation cognitive en proc\'edant \`a un recueil de corpus de dialogues entre un utilisateur (jouant le r\^ole d'un patient) d\'esirant une information m\'edicale et un expert CISMeF af inant cette demande pour construire la requ\^ete. Nous avons analys\'e la structure des dialogues ainsi obtenus et avons \'etudi\'e un certain nombre d'indices discursifs : vocabulaire employ\'e, marques de reformulation, commentaires m\'eta et \'epilinguistiques, expression implicite ou explicite des intentions de l'utilisateur, encha\^inement conversationnel, etc. De cette analyse, nous avons construit un mod\`ele d'agent artificiel dot\'e de capacit\'es cognitives capables d'aider l'utilisateur dans sa t\^ache de recherche d'information. Ce mod\`ele a \'et\'e impl\'ement\'e et int\'egr\'e dans le syst\`eme CISMeF.
[ { "created": "Mon, 10 Feb 2014 20:46:24 GMT", "version": "v1" } ]
2014-02-12
[ [ "Chaignaud", "Nathalie", "", "LITIS" ], [ "Delavigne", "Valérie", "", "LiDiFra" ], [ "Holzem", "Maryvonne", "", "LiDiFra" ], [ "Kotowicz", "Jean-Philippe", "", "LITIS" ], [ "Loisel", "Alain", "", "LITIS" ] ]
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1402.2566
Stefano De Leo
Manoel Araujo, Silvania Carvalho, Stefano De Leo
The frequency crossover for the Goos-Hanchen shift
14 pages, 4 figures
Journal of Modern Optics 60, 1772-1780 (2013)
10.1080/09500340.2013.860199
null
physics.optics quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
For total reflection, the Goos-Hanchen (GH) shift is proportional to the wavelength of the laser beam. At critical angles, such a shift is instead proportional to the square root of the product of the beam waist and wavelength. By using the stationary phase method (SPM) and, when necessary, numerical calculations, we present a detailed analysis of the frequency crossover for the GH shift. The study, done in different incidence regions, sheds new light on the validity of the analytic formulas found in literature.
[ { "created": "Tue, 11 Feb 2014 17:24:18 GMT", "version": "v1" }, { "created": "Mon, 1 Sep 2014 16:44:01 GMT", "version": "v2" } ]
2014-09-02
[ [ "Araujo", "Manoel", "" ], [ "Carvalho", "Silvania", "" ], [ "De Leo", "Stefano", "" ] ]
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1402.2572
Blas Manuel Rodr\'iguez-Lara
F. Soto-Eguibar, B. M. Rodr\'iguez-Lara and H. M. Moya-Cessa
Phase state and related nonlinear coherents states
11 pages
J. Opt. Soc. Am. B 31, 1335 - 1338 (2014)
10.1364/JOSAB.31.001335
null
quant-ph physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We cast the phase state as a $SU(1,1)$ nonlinear coherent state to support the idea that the $SU(1,1)$ representation of the electromagnetic field may be helpful in some instances and to bring forward that it may relate to the phase state problem. We also construct nonlinear coherent states related to the exponential phase operator and provide their corresponding nonlinear annihilation operators. Finally, we discuss the propagation of classical fields through arrays of coupled waveguides that are solved through the use of nonlinear coherent states of $SU(1,1)$ or the exponential phase operator.
[ { "created": "Tue, 11 Feb 2014 17:36:48 GMT", "version": "v1" }, { "created": "Wed, 4 Jun 2014 15:21:19 GMT", "version": "v2" } ]
2014-06-05
[ [ "Soto-Eguibar", "F.", "" ], [ "Rodríguez-Lara", "B. M.", "" ], [ "Moya-Cessa", "H. M.", "" ] ]
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1402.2573
Pol Grasland-Mongrain
Pol Grasland-Mongrain, Jean-Martial Mari, Jean-Yves Chapelon, Cyril Lafon
Lorentz Force Electrical Impedance Tomography
null
Innovation and Research in Biomedical Engineering, 34 (4-5), 357-360, 2013
10.1016/j.irbm.2013.08.002
null
physics.med-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This article describes a method called Lorentz Force Electrical Impedance Tomography. The electrical conductivity of biological tissues can be measured through their sonication in a magnetic field: the vibration of the tissues inside the field induces an electrical current by Lorentz force. This current, detected by electrodes placed around the sample, is proportional to the ultrasonic pressure, to the strength of the magnetic field and to the electrical conductivity gradient along the acoustic axis. By focusing at different places inside the sample, a map of the electrical conductivity gradient can be established. In this study experiments were conducted on a gelatin phantom and on a beef sample, successively placed in a 300 mT magnetic field and sonicated with an ultrasonic transducer focused at 21 cm emitting 500 kHz bursts. Although all interfaces are not visible, in this exploratory study a good correlation is observed between the electrical conductivity image and the ultrasonic image. This method offers an alternative to detecting pathologies invisible to standard ultrasonography.
[ { "created": "Tue, 11 Feb 2014 17:44:28 GMT", "version": "v1" } ]
2014-02-12
[ [ "Grasland-Mongrain", "Pol", "" ], [ "Mari", "Jean-Martial", "" ], [ "Chapelon", "Jean-Yves", "" ], [ "Lafon", "Cyril", "" ] ]
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1402.2578
Pol Grasland-Mongrain
Pol Grasland-Mongrain, Jean-Martial Mari, Bruno Gilles, Adrien Poizat, Jean-Yves Chapelon and Cyril Lafon
Lorentz-Force Hydrophone Characterization
null
IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 61 (2), 353-363, 2014
10.1109/TUFFC.2014.2914
null
physics.ins-det physics.med-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A Lorentz-force hydrophone consists of a thin wire placed inside a magnetic field. When under the influence of an ultrasound pulse, the wire vibrates and an electrical signal is induced by the Lorentz force that is proportional to the pulse amplitude. In this study a compact prototype of such a hydrophone is introduced and characterized, and the hydrodynamic model previously developed is refined. It is shown that the wire tension has a negligible effect on the measurement of pressure. The frequency response of the hydrophone reaches 1 MHz for wires with a diameter ranging between 70 and 400 \micro m. The hydrophone exhibits a directional response such that the signal amplitude differs by less than 3dB as the angle of the incident ultrasound pulse varies from -20$^o$ and +20$^o$. The linearity of the measured signal is confirmed across the 50 kPa to 10 MPa pressure range, and an excellent resistance to cavitation is observed. This hydrophone is of interest for high pressure ultrasound measurements including High Intensity Focused Ultrasound (HIFU) and ultrasonic measurements in difficult environments.
[ { "created": "Tue, 11 Feb 2014 17:56:52 GMT", "version": "v1" } ]
2014-02-12
[ [ "Grasland-Mongrain", "Pol", "" ], [ "Mari", "Jean-Martial", "" ], [ "Gilles", "Bruno", "" ], [ "Poizat", "Adrien", "" ], [ "Chapelon", "Jean-Yves", "" ], [ "Lafon", "Cyril", "" ] ]
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1402.2579
Amar Prasad Misra
A. P. Misra and Y. Wang
Dust-acoustic solitary waves in a magnetized dusty plasma with nonthermal electrons and trapped ions
8 pages, 4 figures; The revised version to appear in Communications in Nonlinear Science and Numerical Simulation (2014)
Communications in Nonlinear Science and Numerical Simulation 22 (2015)1360-1369
10.1016/j.cnsns.2014.07.017
null
physics.plasm-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The nonlinear propagation of electrostatic dust-acoustic (DA) waves in a magnetized dusty plasma consisting of negatively charged mobile dusts, nonthermal fast electrons and trapped ions with vortex-like distribution is studied. Using the reductive perturbation technique, a Korteweg-de Vries (KdV)-like equation is derived which governs the dynamics of the small-amplitude solitary waves in a magnetized dusty nonthermal plasma. It is found that due to the dust thermal pressure, there exists a critical value $(\beta_c)$ of the nothermal parameter $\beta~(>1)$, denoting the percentage of energetic electrons, below which the DA solitary waves cease to propagate. The soliton solution (travelling wave) of the KdV-like equation is obtained, and is shown to be only of the rarefactive type. The properties of the solitons are analyzed numerically with the system parameters. It is also seen that the effect of the static magnetic field (which only modifies the soliton width) becomes significant when the dust gyrofrequency is smaller than one-tenth of the dust plasma frequency. Furthermore, the amplitude of the soliton is found to increase (decrease) when the ratio of the free to trapped ion temperatures $(\sigma)$ is positive (negative). The effects of the system parameters including the obliqueness of propagation $(l_z)$ and $\sigma$ on the dynamics of the DA solitons are also discussed numerically, and it is found that the soliton structures can withstand perturbations and turbulence during a considerable time. The results should be useful for understanding the nonlinear propagation of DA solitary waves in laboratory and space plasmas (e.g., Earth's magnetosphere, auroral region, heliospheric environments etc.).
[ { "created": "Tue, 11 Feb 2014 17:58:16 GMT", "version": "v1" }, { "created": "Wed, 23 Jul 2014 02:20:32 GMT", "version": "v2" } ]
2014-12-02
[ [ "Misra", "A. P.", "" ], [ "Wang", "Y.", "" ] ]
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1402.2581
Guillaume Jeanmairet
Guillaume Jeanmairet, Virginie Marry, Maximilien Levesque, Benjamin Rotenberg and Daniel Borgis
Hydration of Clays at the Molecular Scale: The Promising Perspective of Classical Density Functional Theory
24 pages, 8 figures. Molecular Physics (2014)
Molecular Physics 112, 1320-1329 (2014)
10.1080/00268976.2014.899647
null
physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We report here how the hydration of complex surfaces can be efficiently studied thanks to recent advances in classical molecular density functional theory. This is illustrated on the example of the pyrophylite clay. After presenting the most recent advances, we show that the strength of this implicit method is that (i) it is in quantitative or semi-quantitative agreement with reference all-atoms simulations (molecular dynamics here) for both the solvation structure and energetics, and that (ii) the computational cost is two to three orders of magnitude less than in explicit methods. The method remains imperfect, in that it locally overestimates the polarization of water close to hydrophylic sites of the clay. The high numerical efficiency of the method is illustrated and exploited to carry a systematic study of the electrostatic and van der Waals components of the surface-solvant interactions within the most popular force field for clays, CLAYFF. Hydration structure and energetics are found to weakly depend upon the electrostatics. We conclude on the consequences of such findings in future force-field development.
[ { "created": "Tue, 11 Feb 2014 18:02:17 GMT", "version": "v1" }, { "created": "Fri, 25 Apr 2014 15:25:11 GMT", "version": "v2" } ]
2014-05-21
[ [ "Jeanmairet", "Guillaume", "" ], [ "Marry", "Virginie", "" ], [ "Levesque", "Maximilien", "" ], [ "Rotenberg", "Benjamin", "" ], [ "Borgis", "Daniel", "" ] ]
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1402.2583
Tao Yang
Ziyang Meng, Tao Yang, Dimos V. Dimarogonas and Karl H. Johansson
Coordinated Output Regulation of Heterogeneous Linear Systems under Switching Topologies
null
null
null
null
cs.SY cs.MA math.OC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper constructs a framework to describe and study the coordinated output regulation problem for multiple heterogeneous linear systems. Each agent is modeled as a general linear multiple-input multiple-output system with an autonomous exosystem which represents the individual offset from the group reference for the agent. The multi-agent system as a whole has a group exogenous state which represents the tracking reference for the whole group. Under the constraints that the group exogenous output is only locally available to each agent and that the agents have only access to their neighbors' information, we propose observer-based feedback controllers to solve the coordinated output regulation problem using output feedback information. A high-gain approach is used and the information interactions are allowed to be switched over a finite set of fixed networks containing both graphs that have a directed spanning tree and graphs that do not. The fundamental relationship between the information interactions, the dwell time, the non-identical dynamics of different agents, and the high-gain parameters is given. Simulations are shown to validate the theoretical results.
[ { "created": "Mon, 10 Feb 2014 13:35:19 GMT", "version": "v1" } ]
2014-02-12
[ [ "Meng", "Ziyang", "" ], [ "Yang", "Tao", "" ], [ "Dimarogonas", "Dimos V.", "" ], [ "Johansson", "Karl H.", "" ] ]
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1402.2589
Ren\'e Van Bevern
Ren\'e van Bevern and Robert Bredereck and Laurent Bulteau and Jiehua Chen and Vincent Froese and Rolf Niedermeier and Gerhard J. Woeginger
Partitioning Perfect Graphs into Stars
Manuscript accepted to Journal of Graph Theory
Journal of Graph Theory 85(2):297--335 (2017)
10.1002/jgt.22062
null
cs.DM cs.DS math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The partition of graphs into "nice" subgraphs is a central algorithmic problem with strong ties to matching theory. We study the partitioning of undirected graphs into same-size stars, a problem known to be NP-complete even for the case of stars on three vertices. We perform a thorough computational complexity study of the problem on subclasses of perfect graphs and identify several polynomial-time solvable cases, for example, on interval graphs and bipartite permutation graphs, and also NP-complete cases, for example, on grid graphs and chordal graphs.
[ { "created": "Tue, 11 Feb 2014 18:14:42 GMT", "version": "v1" }, { "created": "Fri, 14 Feb 2014 16:36:58 GMT", "version": "v2" }, { "created": "Fri, 17 Jun 2016 00:15:55 GMT", "version": "v3" } ]
2017-05-25
[ [ "van Bevern", "René", "" ], [ "Bredereck", "Robert", "" ], [ "Bulteau", "Laurent", "" ], [ "Chen", "Jiehua", "" ], [ "Froese", "Vincent", "" ], [ "Niedermeier", "Rolf", "" ], [ "Woeginger", "Gerhard J.", "" ] ]
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1402.2593
Andrew Lucas
Andrew Lucas
Connecting microscopic physics with the macroscopic properties of materials in introductory physics courses
13 pages, 2 figures. v2: fixed incorrect explanation. v3: added reference, fixed typos
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null
null
physics.ed-ph cond-mat.mtrl-sci
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
An elementary understanding of the relevant length, mass and energy scales at the molecular level can be used to explain the order of magnitude of material properties such as mass density, latent heat, surface tension, elastic moduli and beyond in an introductory physics course. These order of magnitude estimates are remarkably easy to derive, and in many instances are the same for many different liquids and solids. This helps students to understand the origin of the zoo of material properties, and to connect molecular physics to the physics of familiar materials like water, metals and plastics. We also note some simple mechanisms by which material properties can easily vary over many orders of magnitude.
[ { "created": "Tue, 11 Feb 2014 18:25:03 GMT", "version": "v1" }, { "created": "Wed, 12 Feb 2014 02:06:19 GMT", "version": "v2" }, { "created": "Tue, 25 Feb 2014 01:08:01 GMT", "version": "v3" } ]
2014-02-26
[ [ "Lucas", "Andrew", "" ] ]
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1402.2594
Alexander Rakhlin
Alexander Rakhlin, Karthik Sridharan
Online Nonparametric Regression
null
null
null
null
stat.ML cs.LG math.ST stat.TH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We establish optimal rates for online regression for arbitrary classes of regression functions in terms of the sequential entropy introduced in (Rakhlin, Sridharan, Tewari, 2010). The optimal rates are shown to exhibit a phase transition analogous to the i.i.d./statistical learning case, studied in (Rakhlin, Sridharan, Tsybakov 2013). In the frequently encountered situation when sequential entropy and i.i.d. empirical entropy match, our results point to the interesting phenomenon that the rates for statistical learning with squared loss and online nonparametric regression are the same. In addition to a non-algorithmic study of minimax regret, we exhibit a generic forecaster that enjoys the established optimal rates. We also provide a recipe for designing online regression algorithms that can be computationally efficient. We illustrate the techniques by deriving existing and new forecasters for the case of finite experts and for online linear regression.
[ { "created": "Tue, 11 Feb 2014 18:36:11 GMT", "version": "v1" } ]
2014-02-12
[ [ "Rakhlin", "Alexander", "" ], [ "Sridharan", "Karthik", "" ] ]
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1402.2601
Deanna Needell
Raja Giryes and Deanna Needell
Near Oracle Performance and Block Analysis of Signal Space Greedy Methods
null
null
null
null
math.NA cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Compressive sampling (CoSa) is a new methodology which demonstrates that sparse signals can be recovered from a small number of linear measurements. Greedy algorithms like CoSaMP have been designed for this recovery, and variants of these methods have been adapted to the case where sparsity is with respect to some arbitrary dictionary rather than an orthonormal basis. In this work we present an analysis of the so-called Signal Space CoSaMP method when the measurements are corrupted with mean-zero white Gaussian noise. We establish near-oracle performance for recovery of signals sparse in some arbitrary dictionary. In addition, we analyze the block variant of the method for signals whose supports obey a block structure, extending the method into the model-based compressed sensing framework. Numerical experiments confirm that the block method significantly outperforms the standard method in these settings.
[ { "created": "Tue, 11 Feb 2014 19:04:04 GMT", "version": "v1" }, { "created": "Thu, 24 Jul 2014 20:22:44 GMT", "version": "v2" } ]
2014-07-28
[ [ "Giryes", "Raja", "" ], [ "Needell", "Deanna", "" ] ]
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1402.2602
Mario Krenn
Mario Krenn, Robert Fickler, Matthias Fink, Johannes Handsteiner, Mehul Malik, Thomas Scheidl, Rupert Ursin, Anton Zeilinger
Communication with spatially modulated Light through turbulent Air across Vienna
11 pages, 4 figures
New J. Phys. 16, 113028 (2014)
10.1088/1367-2630/16/11/113028
null
physics.optics quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The transverse spatial modes of light offer a large state-space with interesting physical properties. For exploiting it in future long-distance experiments, spatial modes will have to be transmitted over turbulent free-space links. Numerous recent lab-scale experiments have found significant degradation in the mode quality after transmission through simulated turbulence and consecutive coherent detection. Here we experimentally analyze the transmission of one prominent class of spatial modes, the orbital-angular momentum (OAM) modes, through 3 km of strong turbulence over the city of Vienna. Instead of performing a coherent phase-dependent measurement, we employ an incoherent detection scheme which relies on the unambiguous intensity patterns of the different spatial modes. We use a pattern recognition algorithm (an artificial neural network) to identify the characteristic mode pattern displayed on a screen at the receiver. We were able to distinguish between 16 different OAM mode superpositions with only ~1.7% error, and use them to encode and transmit small grey-scale images. Moreover, we found that the relative phase of the superposition modes is not affected by the atmosphere, establishing the feasibility for performing long-distance quantum experiments with the OAM of photons. Our detection method works for other classes of spatial modes with unambiguous intensity patterns as well, and can further be improved by modern techniques of pattern recognition.
[ { "created": "Tue, 11 Feb 2014 19:07:59 GMT", "version": "v1" }, { "created": "Wed, 12 Nov 2014 13:07:09 GMT", "version": "v2" } ]
2014-11-13
[ [ "Krenn", "Mario", "" ], [ "Fickler", "Robert", "" ], [ "Fink", "Matthias", "" ], [ "Handsteiner", "Johannes", "" ], [ "Malik", "Mehul", "" ], [ "Scheidl", "Thomas", "" ], [ "Ursin", "Rupert", "" ], [ "Zeilinger", "Anton", "" ] ]
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1402.2603
Boyu Li
Boyu Li, Dengkui Zhu, Ping Liang
Small Cell In-Band Wireless Backhaul in Massive MIMO Systems: A Cooperation of Next-Generation Techniques
accepted to journal
IEEE TWC, Vol. 14, No. 12, Pages 7057-7069, Dec. 2015
10.1109/TWC.2015.2464299
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Massive multiple-inputmultiple-output (MIMO) systems, dense small-cells (SCs), and full duplex are three candidate techniques for next-generation communication systems. The cooperation of next-generation techniques could offer more benefits, e.g., SC in-band wireless backhaul in massive MIMO systems. In this paper, three strategies of SC in-band wireless backhaul in massive MIMO systems are introduced and compared, i.e., complete time-division duplex (CTDD), zero-division duplex (ZDD), and ZDD with interference rejection (ZDD-IR). Simulation results demonstrate that SC in-band wireless backhaul has the potential to improve the throughput for massive MIMO systems. Specifically, among the three strategies, CTDD is the simplest one and could achieve decent throughput improvement. Depending on conditions, with the self-interference cancellation capability at SCs, ZDD could achieve better throughput than CTDD, even with residual self-interference. Moreover, ZDD-IR requires the additional interference rejection process at the BS compared to ZDD, but it could generally achieve better throughput than CTDD and ZDD.
[ { "created": "Tue, 11 Feb 2014 19:15:56 GMT", "version": "v1" }, { "created": "Wed, 9 Dec 2015 20:41:11 GMT", "version": "v2" } ]
2015-12-10
[ [ "Li", "Boyu", "" ], [ "Zhu", "Dengkui", "" ], [ "Liang", "Ping", "" ] ]
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1402.2604
Vered Rom-Kedar
Ruty Mundel, Erick Fredj, Hezi Gildor, Vered Rom-Kedar
New Lagrangian diagnostics for characterizing fluid flow mixing
null
Physics of Fluids 26, 126602 (2014)
10.1063/1.4903239
null
nlin.CD physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A new kind of Lagrangian diagnostic family is proposed and a specific form of it is suggested for characterizing mixing: the maximal extent of a trajectory (MET). It enables the detection of coherent structures and their dynamics in two- (and potentially three-) dimensional unsteady flows in both bounded and open domains. Its computation is much easier than all other Lagrangian diagnostics known to us and provides new insights regarding the mixing properties on both short and long time scales and on both spatial plots and distribution diagrams. We demonstrate its applicability to two dimensional flows using two toy models and a data set of surface currents from the Mediterranean Sea.
[ { "created": "Tue, 11 Feb 2014 19:22:52 GMT", "version": "v1" } ]
2018-04-10
[ [ "Mundel", "Ruty", "" ], [ "Fredj", "Erick", "" ], [ "Gildor", "Hezi", "" ], [ "Rom-Kedar", "Vered", "" ] ]
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1402.2606
Dibyendu Mukherjee
Dibyendu Mukherjee
A Fast Two Pass Multi-Value Segmentation Algorithm based on Connected Component Analysis
9 pages, 7 figures
null
null
null
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Connected component analysis (CCA) has been heavily used to label binary images and classify segments. However, it has not been well-exploited to segment multi-valued natural images. This work proposes a novel multi-value segmentation algorithm that utilizes CCA to segment color images. A user defined distance measure is incorporated in the proposed modified CCA to identify and segment similar image regions. The raw output of the algorithm consists of distinctly labelled segmented regions. The proposed algorithm has a unique design architecture that provides several benefits: 1) it can be used to segment any multi-channel multi-valued image; 2) the distance measure/segmentation criteria can be application-specific and 3) an absolute linear-time implementation allows easy extension for real-time video segmentation. Experimental demonstrations of the aforesaid benefits are presented along with the comparison results on multiple datasets with current benchmark algorithms. A number of possible application areas are also identified and results on real-time video segmentation has been presented to show the promise of the proposed method.
[ { "created": "Tue, 11 Feb 2014 19:27:05 GMT", "version": "v1" } ]
2014-02-12
[ [ "Mukherjee", "Dibyendu", "" ] ]
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1402.2607
Ali Aghamohammadi
A. Aghamohammadi
Holographic f(T) gravity model
5 pages
null
10.1007/s10509-014-19120
null
physics.gen-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We try to study the corresponding relation between f(T ) gravity and holographic dark energy (HDE). A kind of energy density from f(T) is introduced which has the same role as the HDE density. A f(T ) model according to the the HDE model is calculated .We find out a torsion scalar T based on the scalar factor is assumed by (Capoziello,Nojiri et al. 2006). The effective torsion equation of state, deceleration parameter of the holographic f(T )- gravity model are calculated
[ { "created": "Sat, 18 Jan 2014 13:42:21 GMT", "version": "v1" } ]
2014-04-22
[ [ "Aghamohammadi", "A.", "" ] ]
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1402.2608
Ali Aghamohammadi
A.Aghamohammadi, Kh.Saaidi, A.Mohammadi, H.Sheikhahmadi, T.Golanbari, S.W.Rabiei
Effect of an external interaction mechanism in solving agegraphic dark energy problems
9 pages, 7 figures. Astrophys Space Sci (2013)
null
null
null
physics.gen-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Agegraphic dark energy(ADE) and New-ADE models have been introduced as two candidates for dark energy to explain the accelerated expansion phase of the Universe. In spite of a few suitable features of these models some studies have shown that there are several drawbacks in them. Therefore in this investigation a new version of ADE and New-ADE are studied which can improve such drawbacks which appear in the ordinary ADE and New-ADE scenario. In fact we consider an interacting model of scalar field with matter and after re-deriving some cosmological parameters of the model, we find out the best fit for the model. Actually by finding the best fitting for free parameters of the model, we show that our theoretical results are in a good agreement with observational data.
[ { "created": "Sat, 18 Jan 2014 13:51:24 GMT", "version": "v1" } ]
2017-12-20
[ [ "Aghamohammadi", "A.", "" ], [ "Saaidi", "Kh.", "" ], [ "Mohammadi", "A.", "" ], [ "Sheikhahmadi", "H.", "" ], [ "Golanbari", "T.", "" ], [ "Rabiei", "S. W.", "" ] ]
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1402.2611
Mohammed Abufouda
Mohammed Abufouda
Quality-aware Approach for Engineering Self-adaptive Software Systems
Third International Conference on Information Technology Convergence and Services (ITCS 2014), January 2 ~ 4, 2014, Zurich, Switzerland. arXiv admin note: substantial text overlap with arXiv:1402.2144
null
10.5121/csit.2014.4117
null
cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Self-adaptivity allows software systems to autonomously adjust their behavior during run-time to reduce the cost complexities caused by manual maintenance. In this paper, an approach for building an external adaptation engine for self-adaptive software systems is proposed. In order to improve the quality of self-adaptive software systems, this research addresses two challenges in self-adaptive software systems. The first challenge is managing the complexity of the adaptation space efficiently and the second is handling the run-time uncertainty that hinders the adaptation process. This research utilizes Case-based Reasoning as an adaptation engine along with utility functions for realizing the managed system's requirements and handling uncertainty.
[ { "created": "Tue, 11 Feb 2014 19:49:26 GMT", "version": "v1" } ]
2014-02-12
[ [ "Abufouda", "Mohammed", "" ] ]
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1402.2622
Emmanuel Baccelli
Emmanuel Baccelli (INRIA Saclay - Ile de France), Oliver Hahm (INRIA Saclay - Ile de France), Matthias W\"ahlisch
Spontaneous Wireless Networking to Counter Pervasive Monitoring
W3C / IAB workshop on Strengthening the Internet Against Pervasive Monitoring (STRINT) (2014)
null
null
null
cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Several approaches can be employed to counter pervasive monitoring at large scale on the Internet. One category of approaches aims to harden the current Internet architecture and to increase the security of high profile targets (data centers, exchange points etc.). Another category of approaches aims instead for target dispersal, i.e. disabling systematic mass surveillance via the elimination of existing vantage points, thus forcing surveillance efforts to be more specific and personalized. This paper argues how networking approaches that do not rely on central entities -- but rather on spontaneous interaction, as locally as possible, between autonomous peer entities -- can help realize target dispersal and thus counter pervasive monitoring.
[ { "created": "Tue, 11 Feb 2014 20:14:47 GMT", "version": "v1" } ]
2014-02-12
[ [ "Baccelli", "Emmanuel", "", "INRIA Saclay - Ile de France" ], [ "Hahm", "Oliver", "", "INRIA\n Saclay - Ile de France" ], [ "Wählisch", "Matthias", "" ] ]
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1402.2623
Michael Sheinman
M. Sheinman and A. Sharma and J. Alvarado and G. H. Koenderink and F. C. MacKintosh
Active biopolymer networks generate scale-free but euclidean clusters
6 pages, 7 figures
Phys. Rev. E 92, 012710 (2015)
10.1103/PhysRevE.92.012710
null
physics.bio-ph cond-mat.soft
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We report analytical and numerical modelling of active elastic networks, motivated by experiments on crosslinked actin networks contracted by myosin motors. Within a broad range of parameters, the motor-driven collapse of active elastic networks leads to a critical state. We show that this state is qualitatively different from that of the random percolation model. Intriguingly, it possesses both euclidean and scale-free structure with Fisher exponent smaller than $2$. Remarkably, an indistinguishable Fisher exponent and the same euclidean structure is obtained at the critical point of the random percolation model after absorbing all enclaves into their surrounding clusters. We propose that in the experiment the enclaves are absorbed due to steric interactions of network elements. We model the network collapse, taking into account the steric interactions. The model shows how the system robustly drives itself towards the critical point of the random percolation model with absorbed enclaves, in agreement with the experiment.
[ { "created": "Fri, 7 Feb 2014 21:02:53 GMT", "version": "v1" } ]
2015-07-10
[ [ "Sheinman", "M.", "" ], [ "Sharma", "A.", "" ], [ "Alvarado", "J.", "" ], [ "Koenderink", "G. H.", "" ], [ "MacKintosh", "F. C.", "" ] ]
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1402.2625
Benjamin Cambon
Benjamin Cambon (CPT), Xavier Leoncini (CPT), Michel Vittot (CPT), R\'emi Dumont (IRFM), Xavier Garbet (IRFM)
Chaotic motion of charged particles in toroidal magnetic configurations
null
Chaos, American Institute of Physics (AIP), 2014, 24 (3), pp.033101
10.1063/1.4885103
null
nlin.CD physics.plasm-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the motion of a charged particle in a tokamak magnetic field and discuss its chaotic nature. Contrary to most of recent studies, we do not make any assumption on any constant of the motion and solve numerically the cyclotron gyration using Hamiltonian formalism. We take advantage of a symplectic integrator allowing us to make long-time simulations. First considering an idealized magnetic configuration, we add a non generic perturbation corresponding to a magnetic ripple, breaking one of the invariant of the motion. Chaotic motion is then observed and opens questions about the link between chaos of magnetic field lines and chaos of particle trajectories. Second, we return to a axi-symmetric configuration and tune the safety factor (magnetic configuration) in order to recover chaotic motion. In this last setting with two constants of the motion, the presence of chaos implies that no third global constant exists, we highlight this fact by looking at variations of the first order of the magnetic moment in this chaotic setting. We are facing a mixed phase space with both regular and chaotic regions and point out the difficulties in performing a global reduction such as gyrokinetics.
[ { "created": "Tue, 11 Feb 2014 20:18:19 GMT", "version": "v1" }, { "created": "Thu, 4 Dec 2014 19:19:40 GMT", "version": "v2" } ]
2014-12-05
[ [ "Cambon", "Benjamin", "", "CPT" ], [ "Leoncini", "Xavier", "", "CPT" ], [ "Vittot", "Michel", "", "CPT" ], [ "Dumont", "Rémi", "", "IRFM" ], [ "Garbet", "Xavier", "", "IRFM" ] ]
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1402.2626
Jan Verschelde
Jan Verschelde and Xiangcheng Yu
GPU acceleration of Newton's method for large systems of polynomial equations in double double and quad double arithmetic
null
null
null
null
cs.DC cs.MS cs.NA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In order to compensate for the higher cost of double double and quad double arithmetic when solving large polynomial systems, we investigate the application of NVIDIA Tesla K20C general purpose graphics processing unit. The focus on this paper is on Newton's method, which requires the evaluation of the polynomials, their derivatives, and the solution of a linear system to compute the update to the current approximation for the solution. The reverse mode of algorithmic differentiation for a product of variables is rewritten in a binary tree fashion so all threads in a block can collaborate in the computation. For double arithmetic, the evaluation and differentiation problem is memory bound, whereas for complex quad double arithmetic the problem is compute bound. With acceleration we can double the dimension and get results that are twice as accurate in about the same time.
[ { "created": "Tue, 11 Feb 2014 20:18:31 GMT", "version": "v1" }, { "created": "Tue, 13 May 2014 13:38:42 GMT", "version": "v2" } ]
2014-05-14
[ [ "Verschelde", "Jan", "" ], [ "Yu", "Xiangcheng", "" ] ]
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1402.2630
Phil Korneev a
Philipp Korneev and Emmanuel d'Humi\`eres and Vladimir Tikhonchuk
Collisionless plasma interpenetration in a strong magnetic field for laboratory astrophysics experiments
null
null
10.1063/1.4866598
null
physics.plasm-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A theoretical analysis for astrophysics-oriented laser-matter interaction experiments in the presence of a strong ambient magnetic field is presented. It is shown that the plasma collision in the ambient magnetic field implies significant perturbations in the electron density and magnetic field distribution. This transient stage is difficult to observe in astrophysical phenomena, but it could be investigated in laboratory experiments. Analytic models are presented, which are supported by particle-in-cell simulations.
[ { "created": "Sat, 8 Feb 2014 22:21:43 GMT", "version": "v1" } ]
2015-06-18
[ [ "Korneev", "Philipp", "" ], [ "d'Humières", "Emmanuel", "" ], [ "Tikhonchuk", "Vladimir", "" ] ]
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1402.2634
Tao Yang
Ziyang Meng, Tao Yang, Guodong Shi, Dimos V. Dimarogonas, Yiguang Hong, and Karl H. Johansson
Cooperative Set Aggregation for Multiple Lagrangian Systems
null
null
null
null
cs.SY math.OC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we study the cooperative set tracking problem for a group of Lagrangian systems. Each system observes a convex set as its local target. The intersection of these local sets is the group aggregation target. We first propose a control law based on each system's own target sensing and information exchange with neighbors. With necessary connectivity for both cases of fixed and switching communication graphs, multiple Lagrangian systems are shown to achieve rendezvous on the intersection of all the local target sets while the vectors of generalized coordinate derivatives are driven to zero. Then, we introduce the collision avoidance control term into set aggregation control to ensure group dispersion. By defining an ultimate bound on the final generalized coordinate between each system and the intersection of all the local target sets, we show that multiple Lagrangian systems approach a bounded region near the intersection of all the local target sets while the collision avoidance is guaranteed during the movement. In addition, the vectors of generalized coordinate derivatives of all the mechanical systems are shown to be driven to zero. Simulation results are given to validate the theoretical results.
[ { "created": "Mon, 10 Feb 2014 13:14:31 GMT", "version": "v1" } ]
2014-02-12
[ [ "Meng", "Ziyang", "" ], [ "Yang", "Tao", "" ], [ "Shi", "Guodong", "" ], [ "Dimarogonas", "Dimos V.", "" ], [ "Hong", "Yiguang", "" ], [ "Johansson", "Karl H.", "" ] ]
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1402.2635
Bei Yu
Bei Yu and Xiaoqing Xu and Jhih-Rong Gao and David Z. Pan
Methodology for standard cell compliance and detailed placement for triple patterning lithography
null
null
null
null
cs.AR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
As the feature size of semiconductor process further scales to sub-16nm technology node, triple patterning lithography (TPL) has been regarded one of the most promising lithography candidates. M1 and contact layers, which are usually deployed within standard cells, are most critical and complex parts for modern digital designs. Traditional design flow that ignores TPL in early stages may limit the potential to resolve all the TPL conflicts. In this paper, we propose a coherent framework, including standard cell compliance and detailed placement to enable TPL friendly design. Considering TPL constraints during early design stages, such as standard cell compliance, improves the layout decomposability. With the pre-coloring solutions of standard cells, we present a TPL aware detailed placement, where the layout decomposition and placement can be resolved simultaneously. Our experimental results show that, with negligible impact on critical path delay, our framework can resolve the conflicts much more easily, compared with the traditional physical design flow and followed layout decomposition.
[ { "created": "Tue, 11 Feb 2014 20:29:09 GMT", "version": "v1" } ]
2014-02-12
[ [ "Yu", "Bei", "" ], [ "Xu", "Xiaoqing", "" ], [ "Gao", "Jhih-Rong", "" ], [ "Pan", "David Z.", "" ] ]
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1402.2637
Sunav Choudhary
Sunav Choudhary and Urbashi Mitra
Identifiability Scaling Laws in Bilinear Inverse Problems
25 pages, 5 figures
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A number of ill-posed inverse problems in signal processing, like blind deconvolution, matrix factorization, dictionary learning and blind source separation share the common characteristic of being bilinear inverse problems (BIPs), i.e. the observation model is a function of two variables and conditioned on one variable being known, the observation is a linear function of the other variable. A key issue that arises for such inverse problems is that of identifiability, i.e. whether the observation is sufficient to unambiguously determine the pair of inputs that generated the observation. Identifiability is a key concern for applications like blind equalization in wireless communications and data mining in machine learning. Herein, a unifying and flexible approach to identifiability analysis for general conic prior constrained BIPs is presented, exploiting a connection to low-rank matrix recovery via lifting. We develop deterministic identifiability conditions on the input signals and examine their satisfiability in practice for three classes of signal distributions, viz. dependent but uncorrelated, independent Gaussian, and independent Bernoulli. In each case, scaling laws are developed that trade-off probability of robust identifiability with the complexity of the rank two null space. An added appeal of our approach is that the rank two null space can be partly or fully characterized for many bilinear problems of interest (e.g. blind deconvolution). We present numerical experiments involving variations on the blind deconvolution problem that exploit a characterization of the rank two null space and demonstrate that the scaling laws offer good estimates of identifiability.
[ { "created": "Tue, 11 Feb 2014 20:31:30 GMT", "version": "v1" }, { "created": "Sat, 8 Nov 2014 03:05:56 GMT", "version": "v2" } ]
2014-11-11
[ [ "Choudhary", "Sunav", "" ], [ "Mitra", "Urbashi", "" ] ]
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1402.2641
Mart\'in Dar\'io Safe
Luciano N. Grippo and Mart\'in D. Safe
On circular-arc graphs having a model with no three arcs covering the circle
15 pages, 3 figures. This paper originally appeared in proceedings of the XVI Congreso Latino-Iberoamericano de Investigaci\'on Operativa and the XLIV Simp\'osio Brasileiro de Pesquisa Operacional, September 24-28, 2012, Rio de Janeiro, Brazil. Anais do XLIV Simposio Brasileiro de Pesquisa Operacional, SOBRAPO, Rio de Janeiro, Brazil, 2012, pages 4093--4104. http://www.din.uem.br/sbpo/sbpo2012/pdf/arq0518.pdf
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cs.DM math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
An interval graph is the intersection graph of a finite set of intervals on a line and a circular-arc graph is the intersection graph of a finite set of arcs on a circle. While a forbidden induced subgraph characterization of interval graphs was found fifty years ago, finding an analogous characterization for circular-arc graphs is a long-standing open problem. In this work, we study the intersection graphs of finite sets of arcs on a circle no three of which cover the circle, known as normal Helly circular-arc graphs. Those circular-arc graphs which are minimal forbidden induced subgraphs for the class of normal Helly circular-arc graphs were identified by Lin, Soulignac, and Szwarcfiter, who also posed the problem of determining the remaining minimal forbidden induced subgraphs. In this work, we solve their problem, obtaining the complete list of minimal forbidden induced subgraphs for the class of normal Helly circular-arc graphs.
[ { "created": "Tue, 11 Feb 2014 20:46:22 GMT", "version": "v1" } ]
2014-02-12
[ [ "Grippo", "Luciano N.", "" ], [ "Safe", "Martín D.", "" ] ]
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1402.2642
Marco Compagnoni
Marco Compagnoni, Roberto Notari, Fabio Antonacci, Augusto Sarti
A comprehensive analysis of the geometry of TDOA maps in localisation problems
51 pages (3 appendices of 12 pages), 12 figures
Inverse Problems, Vol. 30, Number 3, Pages 035004, 2014
10.1088/0266-5611/30/3/035004
null
math-ph cs.CE cs.SD gr-qc math.AC math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this manuscript we consider the well-established problem of TDOA-based source localization and propose a comprehensive analysis of its solutions for arbitrary sensor measurements and placements. More specifically, we define the TDOA map from the physical space of source locations to the space of range measurements (TDOAs), in the specific case of three receivers in 2D space. We then study the identifiability of the model, giving a complete analytical characterization of the image of this map and its invertibility. This analysis has been conducted in a completely mathematical fashion, using many different tools which make it valid for every sensor configuration. These results are the first step towards the solution of more general problems involving, for example, a larger number of sensors, uncertainty in their placement, or lack of synchronization.
[ { "created": "Mon, 10 Feb 2014 18:08:20 GMT", "version": "v1" } ]
2014-02-13
[ [ "Compagnoni", "Marco", "" ], [ "Notari", "Roberto", "" ], [ "Antonacci", "Fabio", "" ], [ "Sarti", "Augusto", "" ] ]
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1402.2647
Ge Wang
Ge Wang
First CT-MRI Scanner for Multi-dimensional Synchrony and Multi-physical Coupling
2 pages, 5 references
null
null
null
physics.med-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose to prototype the first CT-MRI scanner for radiation therapy and basic research, demonstrate its transformative biomedical potential, and initiate a paradigm shift in multimodality imaging. Our design consists of a double donut-shaped pair of permanent magnets to form a regionally uniform ~0.5T magnetic field and leave room for a stationary 9-source interior CT gantry at 3 tube voltages (triple-energy CT). Image reconstruction will be in a compressive sensing framework. Please discuss with Dr. Ge Wang ([email protected]) if you are interested in collaborative opportunities.
[ { "created": "Tue, 11 Feb 2014 20:58:29 GMT", "version": "v1" } ]
2014-02-12
[ [ "Wang", "Ge", "" ] ]
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1402.2648
Deliang Fan Deliang Fan
Deliang Fan, Mrigank Sharad, Kaushik Roy
Design and Synthesis of Ultra Low Energy Spin-Memristor Threshold Logic
this paper is submitted to IEEE Transactions on Nanotechnology. It is currently under review
IEEE Transactions on Nanotechnology, Volume:13, Issue: 3, 2014
10.1109/TNANO.2014.2312177
null
cs.ET cond-mat.mes-hall
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A threshold logic gate (TLG) performs weighted sum of multiple inputs and compares the sum with a threshold. We propose Spin-Memeristor Threshold Logic (SMTL) gates, which employ memristive cross-bar array (MCA) to perform current-mode summation of binary inputs, whereas, the low-voltage fast-switching spintronic threshold devices (STD) carry out the threshold operation in an energy efficient manner. Field programmable SMTL gate arrays can operate at a small terminal voltage of ~50mV, resulting in ultra-low power consumption in gates as well as programmable interconnect networks. We evaluate the performance of SMTL using threshold logic synthesis. Results for common benchmarks show that SMTL based programmable logic hardware can be more than 100x energy efficient than state of the art CMOS FPGA.
[ { "created": "Mon, 10 Feb 2014 19:59:29 GMT", "version": "v1" } ]
2014-11-11
[ [ "Fan", "Deliang", "" ], [ "Sharad", "Mrigank", "" ], [ "Roy", "Kaushik", "" ] ]
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1402.2661
Eduardo Nahmad Ph.D.
E. Mayoral and E. Nahmad-Achar
Scaling properties in the adsorption of ionic polymeric surfactants on generic nanoparticles of metallic oxides by mesoscopic simulation
10 pages, 6 figures
in: L. Di G. Sigalotti et al. (eds.), Computational and Experimental Fluid Mechanics with Applications to Physics, Engineering and the Environment, Springer International Publishing (2014)
10.1007/978-3-319-00191-3
null
physics.chem-ph cond-mat.soft
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the scaling of adsorption isotherms of polyacrylic dispersants on generic surfaces of metallic oxides $XnOm$ as a function of the number of monomeric units, using Electrostatic Dissipative Particle Dynamics simulations. The simulations show how the scaling properties in these systems emerge and how the isotherms rescale to a universal curve, reproducing reported experimental results. The critical exponent for these systems is also obtained, in perfect agreement with the scaling theory of deGennes. Some important applications are mentioned.
[ { "created": "Tue, 11 Feb 2014 21:05:18 GMT", "version": "v1" } ]
2014-02-13
[ [ "Mayoral", "E.", "" ], [ "Nahmad-Achar", "E.", "" ] ]
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1402.2664
Ren\'e van Bevern
Ren\'e van Bevern and Robert Bredereck and Jiehua Chen and Vincent Froese and Rolf Niedermeier and Gerhard J. Woeginger
Network-Based Vertex Dissolution
Version accepted at SIAM Journal on Discrete Mathematics
SIAM Journal on Discrete Mathematics 29(2):888-914, 2015
10.1137/140978880
null
cs.DM cs.DS cs.SI math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We introduce a graph-theoretic vertex dissolution model that applies to a number of redistribution scenarios such as gerrymandering in political districting or work balancing in an online situation. The central aspect of our model is the deletion of certain vertices and the redistribution of their load to neighboring vertices in a completely balanced way. We investigate how the underlying graph structure, the knowledge of which vertices should be deleted, and the relation between old and new vertex loads influence the computational complexity of the underlying graph problems. Our results establish a clear borderline between tractable and intractable cases.
[ { "created": "Tue, 11 Feb 2014 21:12:04 GMT", "version": "v1" }, { "created": "Thu, 17 Apr 2014 16:19:03 GMT", "version": "v2" }, { "created": "Sun, 15 Mar 2015 21:21:59 GMT", "version": "v3" } ]
2016-01-12
[ [ "van Bevern", "René", "" ], [ "Bredereck", "Robert", "" ], [ "Chen", "Jiehua", "" ], [ "Froese", "Vincent", "" ], [ "Niedermeier", "Rolf", "" ], [ "Woeginger", "Gerhard J.", "" ] ]
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1402.2665
Britton Olson
Britton J. Olson and Jeffrey A. Greenough
Large eddy simulation requirements for the Richtmyer-Meshkov Instability
null
null
10.1063/1.4871396
null
physics.flu-dyn
http://creativecommons.org/licenses/publicdomain/
The shock induced mixing of two gases separated by a perturbed interface is investigated through Large Eddy Simulation (LES) and Direct Numerical Simulation (DNS). In a simulation, physical dissipation of the velocity field and species mass fraction often compete with numerical dissipation arising from the errors of the numerical method. In a DNS the computational mesh resolves all physical gradients of the flow and the relative effect of numerical dissipation is small. In LES, unresolved scales are present and numerical dissipation can have a large impact on the flow, depending on the computational mesh. A suite of simulations explores the space between these two extremes by studying the effects of grid resolution, Reynolds number and numerical method on the mixing process. Results from a DNS are shown using two different codes, which use a high- and low-order numerical method and show convergence in the temporal and spectral dependent quantities associated with mixing. Data from a coarse LES are also presented and include a grid convergence study. A model for an effective viscosity is proposed which allows for an a posteriori analysis of the simulation data that is agnostic to the LES model, numerics and the physical Reynolds number of the simulation. An analogous approximation for an effective species diffusivity is also presented. This framework can then be used to estimate the effective Reynolds number and Schmidt number of future simulations, elucidate the impact of numerical dissipation on the mixing process for an arbitrary numerical method and provide guidance for resolution requirements of future calculations
[ { "created": "Tue, 11 Feb 2014 21:13:09 GMT", "version": "v1" }, { "created": "Fri, 14 Mar 2014 22:28:26 GMT", "version": "v2" } ]
2015-06-18
[ [ "Olson", "Britton J.", "" ], [ "Greenough", "Jeffrey A.", "" ] ]
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1402.2667
Tengyuan Liang
Tengyuan Liang, Hariharan Narayanan and Alexander Rakhlin
On Zeroth-Order Stochastic Convex Optimization via Random Walks
10 pages, 3 figures
null
null
null
cs.LG stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose a method for zeroth order stochastic convex optimization that attains the suboptimality rate of $\tilde{\mathcal{O}}(n^{7}T^{-1/2})$ after $T$ queries for a convex bounded function $f:{\mathbb R}^n\to{\mathbb R}$. The method is based on a random walk (the \emph{Ball Walk}) on the epigraph of the function. The randomized approach circumvents the problem of gradient estimation, and appears to be less sensitive to noisy function evaluations compared to noiseless zeroth order methods.
[ { "created": "Tue, 11 Feb 2014 21:18:11 GMT", "version": "v1" } ]
2014-02-13
[ [ "Liang", "Tengyuan", "" ], [ "Narayanan", "Hariharan", "" ], [ "Rakhlin", "Alexander", "" ] ]
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1402.2671
David Bild
David R. Bild, Yue Liu, Robert P. Dick, Z. Morley Mao, and Dan S. Wallach
Aggregate Characterization of User Behavior in Twitter and Analysis of the Retweet Graph
17 pages, 21 figures
ACM Trans. Internet Technol. 15, 1, Article 4 (February 2015), 24 pages
10.1145/2700060
null
cs.SI physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Most previous analysis of Twitter user behavior is focused on individual information cascades and the social followers graph. We instead study aggregate user behavior and the retweet graph with a focus on quantitative descriptions. We find that the lifetime tweet distribution is a type-II discrete Weibull stemming from a power law hazard function, the tweet rate distribution, although asymptotically power law, exhibits a lognormal cutoff over finite sample intervals, and the inter-tweet interval distribution is power law with exponential cutoff. The retweet graph is small-world and scale-free, like the social graph, but is less disassortative and has much stronger clustering. These differences are consistent with it better capturing the real-world social relationships of and trust between users. Beyond just understanding and modeling human communication patterns and social networks, applications for alternative, decentralized microblogging systems-both predicting real-word performance and detecting spam-are discussed.
[ { "created": "Tue, 11 Feb 2014 21:29:33 GMT", "version": "v1" } ]
2015-02-17
[ [ "Bild", "David R.", "" ], [ "Liu", "Yue", "" ], [ "Dick", "Robert P.", "" ], [ "Mao", "Z. Morley", "" ], [ "Wallach", "Dan S.", "" ] ]
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1402.2673
Jakub Nalepa
Jakub Nalepa and Michal Kawulok
Real-Time Hand Shape Classification
11 pages
null
10.1007/978-3-319-06932-6_35
null
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The problem of hand shape classification is challenging since a hand is characterized by a large number of degrees of freedom. Numerous shape descriptors have been proposed and applied over the years to estimate and classify hand poses in reasonable time. In this paper we discuss our parallel framework for real-time hand shape classification applicable in real-time applications. We show how the number of gallery images influences the classification accuracy and execution time of the parallel algorithm. We present the speedup and efficiency analyses that prove the efficacy of the parallel implementation. Noteworthy, different methods can be used at each step of our parallel framework. Here, we combine the shape contexts with the appearance-based techniques to enhance the robustness of the algorithm and to increase the classification score. An extensive experimental study proves the superiority of the proposed approach over existing state-of-the-art methods.
[ { "created": "Tue, 11 Feb 2014 21:32:48 GMT", "version": "v1" } ]
2014-06-04
[ [ "Nalepa", "Jakub", "" ], [ "Kawulok", "Michal", "" ] ]
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1402.2676
Parameswaran Raman
Hyokun Yun, Parameswaran Raman, S.V.N. Vishwanathan
Ranking via Robust Binary Classification and Parallel Parameter Estimation in Large-Scale Data
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null
null
null
stat.ML cs.DC cs.LG stat.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose RoBiRank, a ranking algorithm that is motivated by observing a close connection between evaluation metrics for learning to rank and loss functions for robust classification. The algorithm shows a very competitive performance on standard benchmark datasets against other representative algorithms in the literature. On the other hand, in large scale problems where explicit feature vectors and scores are not given, our algorithm can be efficiently parallelized across a large number of machines; for a task that requires 386,133 x 49,824,519 pairwise interactions between items to be ranked, our algorithm finds solutions that are of dramatically higher quality than that can be found by a state-of-the-art competitor algorithm, given the same amount of wall-clock time for computation.
[ { "created": "Tue, 11 Feb 2014 21:39:54 GMT", "version": "v1" }, { "created": "Fri, 4 Apr 2014 21:08:34 GMT", "version": "v2" }, { "created": "Fri, 11 Apr 2014 06:19:04 GMT", "version": "v3" }, { "created": "Thu, 21 Aug 2014 06:00:32 GMT", "version": "v4" } ]
2014-08-22
[ [ "Yun", "Hyokun", "" ], [ "Raman", "Parameswaran", "" ], [ "Vishwanathan", "S. V. N.", "" ] ]
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1402.2677
Dmytro Kundys
A. Z. Garcia-Deniz, P. Murzyn, A. M. Fox, D. O. Kundys, J-P. R. Wells, D. M. Whittaker, M. S. Skolnick, T. F. Krauss, J. S. Roberts
Ultrafast reflectivity modulation in AlGaAs/InAlGaAs multiple quantum well photonic crystal waveguides
null
Physical Review B 74, 165327 (2006)
10.1103/PhysRevB.74.165327
null
cond-mat.mes-hall physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We report an ultrafast optical tuning of the reflectivity of AlGaAs/InAlGaAs multiple quantum well photonic crystal waveguides using a reflection geometry, pump-probe technique.
[ { "created": "Tue, 11 Feb 2014 21:43:16 GMT", "version": "v1" } ]
2015-06-18
[ [ "Garcia-Deniz", "A. Z.", "" ], [ "Murzyn", "P.", "" ], [ "Fox", "A. M.", "" ], [ "Kundys", "D. O.", "" ], [ "Wells", "J-P. R.", "" ], [ "Whittaker", "D. M.", "" ], [ "Skolnick", "M. S.", "" ], [ "Krauss", "T. F.", "" ], [ "Roberts", "J. S.", "" ] ]
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1402.2680
Marcos Manzano Mr.
Marc Manzano, Anna Manolova Fagertun, Sarah Ruepp, Eusebi Calle, Caterina Scoglio, Ali Sydney, Antonio de la Oliva, and Alfonso Mu\~noz
Unveiling Potential Failure Propagation Scenarios in Core Transport Networks
Submitted to IEEE Communications Magazine
null
null
null
cs.NI cs.DC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The contemporary society has become more dependent on telecommunication networks. Novel services and technologies supported by such networks, such as cloud computing or e-Health, hold a vital role in modern day living. Large-scale failures are prone to occur, thus being a constant threat to business organizations and individuals. To the best of our knowledge, there are no publicly available reports regarding failure propagation in core transport networks. Furthermore, Software Defined Networking (SDN) is becoming more prevalent in our society and we can envision more SDN-controlled Backbone Transport Networks (BTNs) in the future. For this reason, we investigate the main motivations that could lead to epidemic-like failures in BTNs and SDNTNs. To do so, we enlist the expertise of several research groups with significant background in epidemics, network resiliency, and security. In addition, we consider the experiences of three network providers. Our results illustrate that Dynamic Transport Networks (DTNs) are prone to epidemic-like failures. Moreover, we propose different situations in which a failure can propagate in SDNTNs. We believe that the key findings will aid network engineers and the scientific community to predict this type of disastrous failure scenario and plan adequate survivability strategies.
[ { "created": "Tue, 11 Feb 2014 21:57:55 GMT", "version": "v1" } ]
2014-02-13
[ [ "Manzano", "Marc", "" ], [ "Fagertun", "Anna Manolova", "" ], [ "Ruepp", "Sarah", "" ], [ "Calle", "Eusebi", "" ], [ "Scoglio", "Caterina", "" ], [ "Sydney", "Ali", "" ], [ "de la Oliva", "Antonio", "" ], [ "Muñoz", "Alfonso", "" ] ]
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1402.2681
Liang Zheng
Liang Zheng, Shengjin Wang, Ziqiong Liu, Qi Tian
Packing and Padding: Coupled Multi-index for Accurate Image Retrieval
8 pages, 7 figures, 6 tables. Accepted to CVPR 2014
null
null
null
cs.CV
http://creativecommons.org/licenses/by-nc-sa/3.0/
In Bag-of-Words (BoW) based image retrieval, the SIFT visual word has a low discriminative power, so false positive matches occur prevalently. Apart from the information loss during quantization, another cause is that the SIFT feature only describes the local gradient distribution. To address this problem, this paper proposes a coupled Multi-Index (c-MI) framework to perform feature fusion at indexing level. Basically, complementary features are coupled into a multi-dimensional inverted index. Each dimension of c-MI corresponds to one kind of feature, and the retrieval process votes for images similar in both SIFT and other feature spaces. Specifically, we exploit the fusion of local color feature into c-MI. While the precision of visual match is greatly enhanced, we adopt Multiple Assignment to improve recall. The joint cooperation of SIFT and color features significantly reduces the impact of false positive matches. Extensive experiments on several benchmark datasets demonstrate that c-MI improves the retrieval accuracy significantly, while consuming only half of the query time compared to the baseline. Importantly, we show that c-MI is well complementary to many prior techniques. Assembling these methods, we have obtained an mAP of 85.8% and N-S score of 3.85 on Holidays and Ukbench datasets, respectively, which compare favorably with the state-of-the-arts.
[ { "created": "Tue, 11 Feb 2014 22:00:31 GMT", "version": "v1" }, { "created": "Sun, 13 Apr 2014 09:51:54 GMT", "version": "v2" } ]
2014-04-15
[ [ "Zheng", "Liang", "" ], [ "Wang", "Shengjin", "" ], [ "Liu", "Ziqiong", "" ], [ "Tian", "Qi", "" ] ]
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1402.2683
Radu Horaud P
Antoine Deleforge and Florence Forbes and Radu Horaud
Acoustic Space Learning for Sound Source Separation and Localization on Binaural Manifolds
19 pages, 9 figures, 3 tables
International Journal of Neural Systems 25(1) 2015
10.1142/S0129065714400036
null
cs.SD
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we address the problems of modeling the acoustic space generated by a full-spectrum sound source and of using the learned model for the localization and separation of multiple sources that simultaneously emit sparse-spectrum sounds. We lay theoretical and methodological grounds in order to introduce the binaural manifold paradigm. We perform an in-depth study of the latent low-dimensional structure of the high-dimensional interaural spectral data, based on a corpus recorded with a human-like audiomotor robot head. A non-linear dimensionality reduction technique is used to show that these data lie on a two-dimensional (2D) smooth manifold parameterized by the motor states of the listener, or equivalently, the sound source directions. We propose a probabilistic piecewise affine mapping model (PPAM) specifically designed to deal with high-dimensional data exhibiting an intrinsic piecewise linear structure. We derive a closed-form expectation-maximization (EM) procedure for estimating the model parameters, followed by Bayes inversion for obtaining the full posterior density function of a sound source direction. We extend this solution to deal with missing data and redundancy in real world spectrograms, and hence for 2D localization of natural sound sources such as speech. We further generalize the model to the challenging case of multiple sound sources and we propose a variational EM framework. The associated algorithm, referred to as variational EM for source separation and localization (VESSL) yields a Bayesian estimation of the 2D locations and time-frequency masks of all the sources. Comparisons of the proposed approach with several existing methods reveal that the combination of acoustic-space learning with Bayesian inference enables our method to outperform state-of-the-art methods.
[ { "created": "Tue, 11 Feb 2014 22:01:19 GMT", "version": "v1" }, { "created": "Wed, 19 Mar 2014 09:19:34 GMT", "version": "v2" }, { "created": "Thu, 20 Mar 2014 07:58:18 GMT", "version": "v3" } ]
2015-02-06
[ [ "Deleforge", "Antoine", "" ], [ "Forbes", "Florence", "" ], [ "Horaud", "Radu", "" ] ]
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1402.2690
Zhihua Ma
Z.H. Ma, H. Wang, L. Qian
A meshless method for compressible flows with the HLLC Riemann solver
null
null
null
null
physics.flu-dyn physics.comp-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The HLLC Riemann solver, which resolves both the shock waves and contact discontinuities, is popular to the computational fluid dynamics community studying compressible flow problems with mesh methods. Although it was reported to be used in meshless methods, the crucial information and procedure to realise this scheme within the framework of meshless methods were not clarified fully. Moreover, the capability of the meshless HLLC solver to deal with compressible liquid flows is not completely clear yet as very few related studies have been reported. Therefore, a comprehensive investigation of a dimensional non-split HLLC Riemann solver for the least-square meshless method is carried out in this study. The stiffened gas equation of state is adopted to capacitate the proposed method to deal with single-phase gases and/or liquids effectively, whilst direct applying the perfect gas equation of state for compressible liquid flows might encounter great difficulties in correlating the state variables. The spatial derivatives of the Euler equations are computed by a least-square approximation and the flux terms are calculated by the HLLC scheme in a dimensional non-split pattern. Simulations of gas and liquid shock tubes, moving shock passing a cylinder, internal supersonic flows in channels and external transonic flows over aerofoils are accomplished. The current approach is verified by extensive comparisons of the produced numerical outcomes with various available data such as the exact solutions, finite volume mesh method results, experimental measurements or other reference results.
[ { "created": "Tue, 11 Feb 2014 22:33:09 GMT", "version": "v1" } ]
2014-02-13
[ [ "Ma", "Z. H.", "" ], [ "Wang", "H.", "" ], [ "Qian", "L.", "" ] ]
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1402.2692
Bruce A. Schumm
R. Band, V. Fadeyev, R. C. Field, S. Key, T. Kim, T. Markiewicz, F. Martinez-McKinney, T. Maruyama, K. Mistry, R. Nidumolu, B. A. Schumm, E. Spencer, C. Timlin, M. Wilder
Initial Results of a Silicon Sensor Irradiation Study for ILC Extreme Forward Calorimetry
Talk presented at the International Workshop on Future Linear Colliders (LCWS13), Tokyo, Japan, 11-15 November 2013
null
10.1016/j.nima.2014.04.041
null
physics.ins-det
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Detectors proposed for the International Linear Collider (ILC) incorporate a tungsten sampling calorimeter (`BeamCal') intended to reconstruct showers of electrons, positrons and photons that emerge from the interaction point of the collider with angles between 5 and 50 milliradians. For the innermost radius of this calorimeter, radiation doses at shower-max are expected to reach 100 MRad per year, primarily due to minimum-ionizing electrons and positrons that arise in the induced electromagnetic showers of e+e- `beamstrahlung' pairs produced in the ILC beam-beam interaction. However, radiation damage to calorimeter sensors may be dominated by hadrons induced by nuclear interactions of shower photons, which are much more likely to contribute to the non-ionizing energy loss that has been observed to damage sensors exposed to hadronic radiation. We report here on the results of SLAC Experiment T-506, for which several different types of silicon diode sensors were exposed to doses of radiation induced by showering electrons of energy 3.5-10.6 GeV. By embedding the sensor under irradiation within a tungsten radiator, the exposure incorporated hadronic species that would potentially contribute to the degradation of a sensor mounted in a precision sampling calorimeter. Depending on sensor technology, efficient charge collection was observed for doses as large as 220 MRad.
[ { "created": "Tue, 11 Feb 2014 22:48:11 GMT", "version": "v1" } ]
2015-06-18
[ [ "Band", "R.", "" ], [ "Fadeyev", "V.", "" ], [ "Field", "R. C.", "" ], [ "Key", "S.", "" ], [ "Kim", "T.", "" ], [ "Markiewicz", "T.", "" ], [ "Martinez-McKinney", "F.", "" ], [ "Maruyama", "T.", "" ], [ "Mistry", "K.", "" ], [ "Nidumolu", "R.", "" ], [ "Schumm", "B. A.", "" ], [ "Spencer", "E.", "" ], [ "Timlin", "C.", "" ], [ "Wilder", "M.", "" ] ]
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1402.2695
Laura Deal
Laura Deal
Visualizing Digital Collections
30 pages, 4 figures. This is a preprint of an article submitted for consideration in the Technical Services Quarterly (2014); Technical Services Quarterly is available online at: http://www.tandfonline.com/toc/wtsq20/current
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10.1080/07317131.2015.972871
null
cs.DL cs.IR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Data visualizations can greatly enhance search in digital collections by providing information about the scope and context of a collection and allowing users to more easily browse and explore the contents. This article discusses the benefits of incorporating visualizations into digital collections based on the experiences of the Cold War International History Project (CWIHP) in developing a user-friendly tool for searching and visualizing the project's complex set of historical documents. The paper concludes with a tutorial on using the free Library of Congress tool Viewshare to create visualizations based on real data from the CWIHP Digital Archive.
[ { "created": "Tue, 11 Feb 2014 23:19:14 GMT", "version": "v1" } ]
2014-12-22
[ [ "Deal", "Laura", "" ] ]
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1402.2696
Russell K. Standish
Russell K. Standish
Information Based Complexity of Networks
arXiv admin note: substantial text overlap with arXiv:0805.0685
in {\em Advances in Network Complexity}, Dehmer et al. (eds) (2013), Wiley-VCH, pp 209--247
null
null
nlin.AO cs.SI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Review article of various complexity measures of networks
[ { "created": "Tue, 11 Feb 2014 23:27:43 GMT", "version": "v1" } ]
2014-02-13
[ [ "Standish", "Russell K.", "" ] ]
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1402.2697
Jeffrey McMahon
Jeffrey M. McMahon, Miguel A. Morales, Brian Kolb, and Timo Thonhauser
The Combined Influence of Nuclear Quantum Effects and van der Waals Interactions on the Structure of Ambient Water
null
null
null
null
physics.chem-ph cond-mat.mtrl-sci
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Path-integral molecular dynamics simulations based on density functional theory employing exchange-correlation density functionals capable of treating nonlocal van der Waals (vdW) interactions self-consistently provide a remarkably accurate description of ambient water. Moreover, they suggest that water's structure may be impacted by a combined influence between nuclear quantum effects and vdW interactions. The latter strongly favor the formation of a high-density liquid, whereas the inclusion of the former mitigates this by decreasing the mean hydrogen-bond (H-bond) distance. Examining the structure of water reveals that while the major fraction of molecules do in fact exhibit the traditional picture of near-tetrahedral coordination, the liquid considerably softer than previously simulations have suggested, including a much lower proportion of molecules double-donating H-bonds as well as a much larger distribution of their angles.
[ { "created": "Tue, 11 Feb 2014 23:46:12 GMT", "version": "v1" } ]
2014-02-13
[ [ "McMahon", "Jeffrey M.", "" ], [ "Morales", "Miguel A.", "" ], [ "Kolb", "Brian", "" ], [ "Thonhauser", "Timo", "" ] ]
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1402.2698
Mateus de Oliveira Oliveira
Mateus de Oliveira Oliveira
Automated Verification, Synthesis and Correction of Concurrent Systems via MSO Logic
null
null
null
null
cs.LO cs.DC cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this work we provide algorithmic solutions to five fundamental problems concerning the verification, synthesis and correction of concurrent systems that can be modeled by bounded p/t-nets. We express concurrency via partial orders and assume that behavioral specifications are given via monadic second order logic. A c-partial-order is a partial order whose Hasse diagram can be covered by c paths. For a finite set T of transitions, we let P(c,T,\phi) denote the set of all T-labelled c-partial-orders satisfying \phi. If N=(P,T) is a p/t-net we let P(N,c) denote the set of all c-partially-ordered runs of N. A (b, r)-bounded p/t-net is a b-bounded p/t-net in which each place appears repeated at most r times. We solve the following problems: 1. Verification: given an MSO formula \phi and a bounded p/t-net N determine whether P(N,c)\subseteq P(c,T,\phi), whether P(c,T,\phi)\subseteq P(N,c), or whether P(N,c)\cap P(c,T,\phi)=\emptyset. 2. Synthesis from MSO Specifications: given an MSO formula \phi, synthesize a semantically minimal (b,r)-bounded p/t-net N satisfying P(c,T,\phi)\subseteq P(N, c). 3. Semantically Safest Subsystem: given an MSO formula \phi defining a set of safe partial orders, and a b-bounded p/t-net N, possibly containing unsafe behaviors, synthesize the safest (b,r)-bounded p/t-net N' whose behavior lies in between P(N,c)\cap P(c,T,\phi) and P(N,c). 4. Behavioral Repair: given two MSO formulas \phi and \psi, and a b-bounded p/t-net N, synthesize a semantically minimal (b,r)-bounded p/t net N' whose behavior lies in between P(N,c) \cap P(c,T,\phi) and P(c,T,\psi). 5. Synthesis from Contracts: given an MSO formula \phi^yes specifying a set of good behaviors and an MSO formula \phi^no specifying a set of bad behaviors, synthesize a semantically minimal (b,r)-bounded p/t-net N such that P(c,T,\phi^yes) \subseteq P(N,c) but P(c,T,\phi^no ) \cap P(N,c)=\emptyset.
[ { "created": "Tue, 11 Feb 2014 23:50:39 GMT", "version": "v1" } ]
2014-02-14
[ [ "Oliveira", "Mateus de Oliveira", "" ] ]
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1402.2699
Neil Zhenqiang Gong
Neil Zhenqiang Gong, Di Wang
On the Security of Trustee-based Social Authentications
13 pages. Accepted by IEEE Transactions on Information Forensics and Security
null
10.1109/TIFS.2014.2330311
null
cs.CR cs.SI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Recently, authenticating users with the help of their friends (i.e., trustee-based social authentication) has been shown to be a promising backup authentication mechanism. A user in this system is associated with a few trustees that were selected from the user's friends. When the user wants to regain access to the account, the service provider sends different verification codes to the user's trustees. The user must obtain at least k (i.e., recovery threshold) verification codes from the trustees before being directed to reset his or her password. In this paper, we provide the first systematic study about the security of trustee-based social authentications. Specifically, we first introduce a novel framework of attacks, which we call forest fire attacks. In these attacks, an attacker initially obtains a small number of compromised users, and then the attacker iteratively attacks the rest of users by exploiting trustee-based social authentications. Then, we construct a probabilistic model to formalize the threats of forest fire attacks and their costs for attackers. Moreover, we introduce various defense strategies. Finally, we apply our framework to extensively evaluate various concrete attack and defense strategies using three real-world social network datasets. Our results have strong implications for the design of more secure trustee-based social authentications.
[ { "created": "Wed, 12 Feb 2014 00:10:59 GMT", "version": "v1" }, { "created": "Thu, 20 Feb 2014 23:31:41 GMT", "version": "v2" }, { "created": "Sun, 16 Mar 2014 02:56:04 GMT", "version": "v3" }, { "created": "Sun, 8 Jun 2014 00:26:55 GMT", "version": "v4" } ]
2016-11-18
[ [ "Gong", "Neil Zhenqiang", "" ], [ "Wang", "Di", "" ] ]
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1402.2700
Jan Hubi\v{c}ka
Jan Hubi\v{c}ka, Jaroslav Ne\v{s}et\v{r}il
Bowtie-free graphs have a Ramsey lift
32 pages, 5 figures. Minor corrections; reformatted to elsarticle; accepted to Advances in Applied Mathematics
Advances in Applied Mathematics Volume 96, May 2018, Pages 286-311
10.1016/j.aam.2017.12.005
null
math.CO cs.DM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A bowtie is a graph consisting of two triangles with one vertex identified. We show that the class of all (countable) graphs not containing a bowtie as a subgraph has a Ramsey lift (expansion). This solves one of the old problems in the area and it is the first non-trivial Ramsey class with a non-trivial algebraic closure.
[ { "created": "Wed, 12 Feb 2014 00:11:58 GMT", "version": "v1" }, { "created": "Fri, 25 Jul 2014 15:44:03 GMT", "version": "v2" }, { "created": "Tue, 11 Oct 2016 07:48:07 GMT", "version": "v3" }, { "created": "Tue, 31 Oct 2017 16:56:31 GMT", "version": "v4" }, { "created": "Mon, 11 Dec 2017 16:22:46 GMT", "version": "v5" } ]
2021-02-24
[ [ "Hubička", "Jan", "" ], [ "Nešetřil", "Jaroslav", "" ] ]
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1402.2701
Bernhard Haeupler
Bernhard Haeupler, Dahlia Malkhi
Optimal Gossip with Direct Addressing
null
null
null
null
cs.DS cs.DC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Gossip algorithms spread information by having nodes repeatedly forward information to a few random contacts. By their very nature, gossip algorithms tend to be distributed and fault tolerant. If done right, they can also be fast and message-efficient. A common model for gossip communication is the random phone call model, in which in each synchronous round each node can PUSH or PULL information to or from a random other node. For example, Karp et al. [FOCS 2000] gave algorithms in this model that spread a message to all nodes in $\Theta(\log n)$ rounds while sending only $O(\log \log n)$ messages per node on average. Recently, Avin and Els\"asser [DISC 2013], studied the random phone call model with the natural and commonly used assumption of direct addressing. Direct addressing allows nodes to directly contact nodes whose ID (e.g., IP address) was learned before. They show that in this setting, one can "break the $\log n$ barrier" and achieve a gossip algorithm running in $O(\sqrt{\log n})$ rounds, albeit while using $O(\sqrt{\log n})$ messages per node. We study the same model and give a simple gossip algorithm which spreads a message in only $O(\log \log n)$ rounds. We also prove a matching $\Omega(\log \log n)$ lower bound which shows that this running time is best possible. In particular we show that any gossip algorithm takes with high probability at least $0.99 \log \log n$ rounds to terminate. Lastly, our algorithm can be tweaked to send only $O(1)$ messages per node on average with only $O(\log n)$ bits per message. Our algorithm therefore simultaneously achieves the optimal round-, message-, and bit-complexity for this setting. As all prior gossip algorithms, our algorithm is also robust against failures. In particular, if in the beginning an oblivious adversary fails any $F$ nodes our algorithm still, with high probability, informs all but $o(F)$ surviving nodes.
[ { "created": "Wed, 12 Feb 2014 00:14:58 GMT", "version": "v1" } ]
2014-02-13
[ [ "Haeupler", "Bernhard", "" ], [ "Malkhi", "Dahlia", "" ] ]
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1402.2703
Jeffrey Tsang
Jeffrey Tsang, Rajesh Pereira
Taking all positive eigenvectors is suboptimal in classical multidimensional scaling
13 pages, 1 figure, 1 table, 1 supplementary file
SIAM Journal on Optimization 26(4):2080-2090, 2016
10.1137/15M102602X
null
math.ST cs.NA math.OC stat.TH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
It is hard to overstate the importance of multidimensional scaling as an analysis technique in the broad sciences. Classical, or Torgerson multidimensional scaling is one of the main variants, with the advantage that it has a closed-form analytic solution. However, this solution is exact if and only if the distances are Euclidean. Conversely, there has been comparatively little discussion on what to do in the presence of negative eigenvalues: the intuitive solution, prima facie justifiable in least-squares terms, is to take every positive eigenvector as a dimension. We show that this, minimizing least-squares to the centred distances instead of the true distances, is suboptimal - throwing away positive eigenvectors can decrease the error even as we project to fewer dimensions. We provide provably better methods for handling this common case.
[ { "created": "Wed, 12 Feb 2014 00:29:37 GMT", "version": "v1" } ]
2017-06-13
[ [ "Tsang", "Jeffrey", "" ], [ "Pereira", "Rajesh", "" ] ]
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1402.2704
Chris Watkins
Chris Watkins, Yvonne Buttkewitz
Sex as Gibbs Sampling: a probability model of evolution
null
null
null
null
q-bio.PE cs.NE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We show that evolutionary computation can be implemented as standard Markov-chain Monte-Carlo (MCMC) sampling. With some care, `genetic algorithms' can be constructed that are reversible Markov chains that satisfy detailed balance; it follows that the stationary distribution of populations is a Gibbs distribution in a simple factorised form. For some standard and popular nonparametric probability models, we exhibit Gibbs-sampling procedures that are plausible genetic algorithms. At mutation-selection equilibrium, a population of genomes is analogous to a sample from a Bayesian posterior, and the genomes are analogous to latent variables. We suggest this is a general, tractable, and insightful formulation of evolutionary computation in terms of standard machine learning concepts and techniques. In addition, we show that evolutionary processes in which selection acts by differences in fecundity are not reversible, and also that it is not possible to construct reversible evolutionary models in which each child is produced by only two parents.
[ { "created": "Wed, 12 Feb 2014 00:29:39 GMT", "version": "v1" } ]
2014-02-13
[ [ "Watkins", "Chris", "" ], [ "Buttkewitz", "Yvonne", "" ] ]
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1402.2707
Ralph Tanbourgi
Ralph Tanbourgi and Sarabjot Singh and Jeffrey G. Andrews and Friedrich K. Jondral
Analysis of Non-Coherent Joint-Transmission Cooperation in Heterogeneous Cellular Networks
To appear in IEEE ICC 2014, 6 pages, 5 figures, 1 table
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Base station (BS) cooperation is set to play a key role in managing interference in dense heterogeneous cellular networks (HCNs). Non-coherent joint transmission (JT) is particularly appealing due to its low complexity, smaller overhead, and ability for load balancing. However, a general analysis of this technique is difficult mostly due to the lack of tractable models. This paper addresses this gap and presents a tractable model for analyzing non-coherent JT in HCNs, while incorporating key system parameters such as user-centric BS clustering and channel-dependent cooperation activation. Assuming all BSs of each tier follow a stationary Poisson point process, the coverage probability for non-coherent JT is derived. Using the developed model, it is shown that for small cooperative clusters of small-cell BSs, non-coherent JT by small cells provides spectral efficiency gains without significantly increasing cell load. Further, when cooperation is aggressively triggered intra-cluster frequency reuse within small cells is favorable over intra-cluster coordinated scheduling.
[ { "created": "Wed, 12 Feb 2014 00:33:50 GMT", "version": "v1" }, { "created": "Mon, 17 Feb 2014 10:39:38 GMT", "version": "v2" } ]
2014-02-18
[ [ "Tanbourgi", "Ralph", "" ], [ "Singh", "Sarabjot", "" ], [ "Andrews", "Jeffrey G.", "" ], [ "Jondral", "Friedrich K.", "" ] ]
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1402.2708
Minghui Zhu
Minghui Zhu, Michael Otte, Pratik Chaudhari, Emilio Frazzoli
Game theoretic controller synthesis for multi-robot motion planning Part I : Trajectory based algorithms
null
null
null
null
cs.MA cs.GT cs.SY math.OC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider a class of multi-robot motion planning problems where each robot is associated with multiple objectives and decoupled task specifications. The problems are formulated as an open-loop non-cooperative differential game. A distributed anytime algorithm is proposed to compute a Nash equilibrium of the game. The following properties are proven: (i) the algorithm asymptotically converges to the set of Nash equilibrium; (ii) for scalar cost functionals, the price of stability equals one; (iii) for the worst case, the computational complexity and communication cost are linear in the robot number.
[ { "created": "Wed, 12 Feb 2014 00:38:05 GMT", "version": "v1" }, { "created": "Sat, 15 Feb 2014 00:52:20 GMT", "version": "v2" } ]
2014-02-18
[ [ "Zhu", "Minghui", "" ], [ "Otte", "Michael", "" ], [ "Chaudhari", "Pratik", "" ], [ "Frazzoli", "Emilio", "" ] ]
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1402.2709
Lachlan Gunn
Lachlan J. Gunn, Andrew Allison, Derek Abbott
A directional coupler attack against the Kish key distribution system
null
null
null
null
cs.CR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Kish key distribution system has been proposed as a class ical alternative to quantum key distribution. The idealized Kish scheme elegantly promise s secure key distribution by exploiting thermal noise in a transmission line. However, we demonstrate that it is vulnerable to nonidealities in its components, such as the finite resistance of the transmission line connecting its endpoints. We introduce a novel attack against this nonideality using directional wave measurements, and experimentally demonstrate its efficacy. Our attack is based on causality: in a spatially distributed system, propagation is needed for thermodynamic equilibration, and that leaks information.
[ { "created": "Wed, 12 Feb 2014 00:45:53 GMT", "version": "v1" }, { "created": "Wed, 19 Feb 2014 06:01:59 GMT", "version": "v2" }, { "created": "Tue, 20 May 2014 02:10:07 GMT", "version": "v3" } ]
2014-05-21
[ [ "Gunn", "Lachlan J.", "" ], [ "Allison", "Andrew", "" ], [ "Abbott", "Derek", "" ] ]
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1402.2710
Rodrigo de Lamare
L. Wang, R. C. de Lamare and M. Haardt
Direction Finding Algorithms with Joint Iterative Subspace Optimization
11 figures, 4 tables. IEEE Transactions on Aerospace and Electronic Systems, 2014
null
10.1109/TAES.2014.120395
null
cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, a reduced-rank scheme with joint iterative optimization is presented for direction of arrival estimation. A rank-reduction matrix and an auxiliary reduced-rank parameter vector are jointly optimized to calculate the output power with respect to each scanning angle. Subspace algorithms to estimate the rank-reduction matrix and the auxiliary vector are proposed. Simulations are performed to show that the proposed algorithms achieve an enhanced performance over existing algorithms in the studied scenarios.
[ { "created": "Wed, 12 Feb 2014 01:13:12 GMT", "version": "v1" } ]
2016-11-17
[ [ "Wang", "L.", "" ], [ "de Lamare", "R. C.", "" ], [ "Haardt", "M.", "" ] ]
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1402.2711
Narges Mohammadi
Narges Mohammadi and Feng Wang
First-principles study of Carbz-PAHTDDT dye sensitizer and two Carbz-derived dyes for dye sensitized solar cells
Accepted-Springer- Journal of Molecular Modeling. arXiv admin note: substantial text overlap with arXiv:1307.4832
null
null
JMMO-D-13-00834R1
physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Two new carbazole-based organic dye sensitizers are designed and investigated in silico. These dyes are designed through chemical modifications of the conjugated bridge of a reference organic sensitizer known as Carbz-PAHTDDT (S9) dye. The aim of designing these dyes was to reduce the energy gap between their highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) and to red-shift their absorption response compared to those of the reference S9 dye sensitizer. This reference dye has a reported promising efficiency when coupled with ferrocene-based electrolyte composition. To investigate geometric and electronic structure, density functional theory (DFT) and time-dependent DFT (TD-DFT) calculations were conducted on the new dyes as well as the reference dye. The present study indicated that the long-range correction to the theoretical model in the TD-DFT simulation is important to produce accurate absorption wavelengths.The theoretical studies have shown a reduced HOMO-LUMO gap and red-shifted absorption spectra for both of the new candidate dyes. Such findings suggest that the new dyes are promising and suitable for optoelectronic applications.
[ { "created": "Wed, 12 Feb 2014 01:27:23 GMT", "version": "v1" } ]
2014-02-13
[ [ "Mohammadi", "Narges", "" ], [ "Wang", "Feng", "" ] ]
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1402.2712
Jiamou Liu
Jiamou Liu and Kostya Ross
Dynamic Partial Sorting
null
null
null
null
cs.DS
http://creativecommons.org/licenses/by/3.0/
The dynamic partial sorting problem asks for an algorithm that maintains lists of numbers under the link, cut and change value operations, and queries the sorted sequence of the $k$ least numbers in one of the lists. We first solve the problem in $O(k\log (n))$ time for queries and $O(\log (n))$ time for updates using the tournament tree data structure, where $n$ is the number of elements in the lists. We then introduce a layered tournament tree data structure and solve the same problem in $O(\log_\varphi^* (n) k\log (k))$ time for queries and $O\left(\log (n)\cdot\log^2\log (n)\right)$ for updates, where $\varphi$ is the golden ratio and $\log_\varphi^*(n)$ is the iterated logarithmic function with base $\varphi$.
[ { "created": "Wed, 12 Feb 2014 01:36:36 GMT", "version": "v1" }, { "created": "Thu, 13 Feb 2014 23:19:46 GMT", "version": "v2" }, { "created": "Fri, 18 Apr 2014 02:29:23 GMT", "version": "v3" } ]
2014-04-21
[ [ "Liu", "Jiamou", "" ], [ "Ross", "Kostya", "" ] ]
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1402.2720
Hong Jiang
Hong Jiang, Gang Huang and Paul Wilford
Noise Analysis for Lensless Compressive Imaging
11 pages, 12 figures. arXiv admin note: text overlap with arXiv:1402.0785
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null
null
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We analyze the signal to noise ratio (SNR) in a recently proposed lensless compressive imaging architecture. The architecture consists of a sensor of a single detector element and an aperture assembly of an array of aperture elements, each of which has a programmable transmittance. This lensless compressive imaging architecture can be used in conjunction with compressive sensing to capture images in a compressed form of compressive measurements. In this paper, we perform noise analysis of this lensless compressive imaging architecture and compare it with pinhole aperture imaging and lens aperture imaging. We will show that the SNR in the lensless compressive imaging is independent of the image resolution, while that in either pinhole aperture imaging or lens aperture imaging decreases as the image resolution increases. Consequently, the SNR in the lensless compressive imaging can be much higher if the image resolution is large enough.
[ { "created": "Wed, 12 Feb 2014 03:12:40 GMT", "version": "v1" } ]
2014-02-13
[ [ "Jiang", "Hong", "" ], [ "Huang", "Gang", "" ], [ "Wilford", "Paul", "" ] ]
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1402.2733
Jaideep Mulherkar
Jaideep Mulherkar
An efficient algorithm for the entropy rate of a hidden Markov model with unambiguous symbols
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null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We demonstrate an efficient formula to compute the entropy rate $H(\mu)$ of a hidden Markov process with $q$ output symbols where at least one symbol is unambiguously received. Using an approximation to $H(\mu)$ to the first $N$ terms we give a $O(Nq^3$) algorithm to compute the entropy rate of the hidden Markov model. We use the algorithm to estimate the entropy rate when the parameters of the hidden Markov model are unknown.In the case of $q =2$ the process is the output of the Z-channel and we use this fact to give bounds on the capacity of the Gilbert channel.
[ { "created": "Wed, 12 Feb 2014 04:48:10 GMT", "version": "v1" }, { "created": "Tue, 18 Feb 2014 08:38:29 GMT", "version": "v2" } ]
2014-02-19
[ [ "Mulherkar", "Jaideep", "" ] ]
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1402.2735
Timothy Caldwell
Timothy M. Caldwell and Dave Coleman and Nikolaus Correll
Optimal Parameter Identification for Discrete Mechanical Systems with Application to Flexible Object Manipulation
8 pages, 5 figures, submitted to IROS 2014
null
null
null
cs.RO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a method for system identification of flexible objects by measuring forces and displacement during interaction with a manipulating arm. We model the object's structure and flexibility by a chain of rigid bodies connected by torsional springs. Unlike previous work, the proposed optimal control approach using variational integrators allows identification of closed loops, which include the robot arm itself. This allows using the resulting models for planning in configuration space of the robot. In order to solve the resulting problem efficiently, we develop a novel method for fast discrete-time adjoint-based gradient calculation. The feasibility of the approach is demonstrated using full physics simulation in trep and using data recorded from a 7-DOF series elastic robot arm.
[ { "created": "Wed, 12 Feb 2014 04:59:31 GMT", "version": "v1" } ]
2014-02-13
[ [ "Caldwell", "Timothy M.", "" ], [ "Coleman", "Dave", "" ], [ "Correll", "Nikolaus", "" ] ]
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1402.2741
Dimitris Papamichail
Matthew Mabrey, Thomas Caputi, Georgios Papamichail, Dimitris Papamichail
Static Level Ancestors in Practice
null
null
null
null
cs.DS
http://creativecommons.org/licenses/by-nc-sa/4.0/
Given a rooted tree T, the level ancestor problem aims to answer queries of the form LA(v, d), which identify the level d ancestor of a node v in the tree. Several algorithms of varied complexity have been proposed for this problem in the literature, including optimal solutions that preprocess the tree $T$ in linear bounded time and proceed to answer queries in constant time. Despite its significance and numerous applications, to date there have been no comparative studies of the performance of these algorithms and few implementations are widely available. In our experimental study we implemented and compared several solutions to the level ancestor problem, including three theoretically optimal algorithms, and examined their space requirements and time performance in practice.
[ { "created": "Wed, 12 Feb 2014 05:37:11 GMT", "version": "v1" }, { "created": "Sat, 23 Oct 2021 14:50:40 GMT", "version": "v2" } ]
2021-10-26
[ [ "Mabrey", "Matthew", "" ], [ "Caputi", "Thomas", "" ], [ "Papamichail", "Georgios", "" ], [ "Papamichail", "Dimitris", "" ] ]
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1402.2744
Bo Wei
Bo Wei, Ambuj Varshney, Wen Hu, Neal Patwari, Thiemo Voigt, Chun Tung Chou
dRTI: Directional Radio Tomographic Imaging
null
null
null
null
cs.OH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Radio tomographic imaging (RTI) enables device free localisation of people and objects in many challenging environments and situations. Its basic principle is to detect the changes in the statistics of some radio quality measurements in order to infer the presence of people and objects in the radio path. However, the localisation accuracy of RTI suffers from complicated radio propagation behaviours such as multipath fading and shadowing. In order to improve RTI localisation accuracy, we propose to use inexpensive and energy efficient electronically switched directional (ESD) antennas to improve the quality of radio link behaviour observations, and therefore, the localisation accuracy of RTI. We implement a directional RTI (dRTI) system to understand how directional antennas can be used to improve RTI localisation accuracy. We also study the impact of the choice of antenna directions on the localisation accuracy of dRTI and propose methods to effectively choose informative antenna directions to improve localisation accuracy while reducing overhead. We evaluate the performance of dRTI in diverse indoor environments and show that dRTI significantly outperforms the existing RTI localisation methods based on omni-directional antennas.
[ { "created": "Wed, 12 Feb 2014 06:26:19 GMT", "version": "v1" } ]
2014-02-13
[ [ "Wei", "Bo", "" ], [ "Varshney", "Ambuj", "" ], [ "Hu", "Wen", "" ], [ "Patwari", "Neal", "" ], [ "Voigt", "Thiemo", "" ], [ "Chou", "Chun Tung", "" ] ]
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1402.2745
Pallavi Chavan Prof
Pallavi Vijay Chavan, Dr. Mohammad Atique and Dr. Latesh Malik
Design and Implementation of Hierarchical Visual cryptography with Expansion less Shares
12 pages, 7 figures, International journal of Network security and its applications
International Journal of Network Security & Its Applications (IJNSA), Vol.6, No.1, January 2014
10.5121/ijnsa.2014.6108
null
cs.CR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Novel idea of hierarchical visual cryptography is stated in this paper. The key concept of hierarchical visual cryptography is based upon visual cryptography. Visual cryptography encrypts secret information into two pieces called as shares. These two shares are stacked together by logical XOR operation to reveal the original secret. Hierarchical visual cryptography encrypts the secret in various levels. The encryption in turn is expansionless. The original secret size is retained in the shares at all levels. In this paper secret is encrypted at two different levels. Four shares are generated out of hierarchical visual cryptography. Any three shares are collectively taken to form the key share. All shares generated are meaningless giving no information by visual inspection. Performance analysis is also obtained based upon various categories of secrets. The greying effect is completely removed while revealing the secret Removal of greying effect do not change the meaning of secret.
[ { "created": "Wed, 12 Feb 2014 06:53:39 GMT", "version": "v1" } ]
2014-02-13
[ [ "Chavan", "Pallavi Vijay", "" ], [ "Atique", "Dr. Mohammad", "" ], [ "Malik", "Dr. Latesh", "" ] ]
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1402.2754
Martino Trassinelli
Martino Trassinelli (INSP), Massimiliano Marangolo (INSP), M. Eddrief (INSP), V.H. Etgens (INSP), V. Gafton (INSP), S. Hidki (INSP), Emmanuelle Lacaze (INSP), Emily Lamour (INSP), Christophe Prigent (INSP), Jean-Pierre Rozet (INSP), S. Steydli (INSP), Y. Zheng (INSP), Dominique Vernhet (INSP)
Suppression of the thermal hysteresis in magnetocaloric MnAs thin film by highly charged ion bombardment
null
null
10.1063/1.4866663
null
cond-mat.mtrl-sci physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present the investigation on the modifications of structural and magnetic properties of MnAs thin film epitaxially grown on GaAs induced by slow highly charged ions bombardment under well-controlled conditions. The ion-induced defects facilitate the nucleation of one phase with respect to the other in the first-order magneto-structural MnAs transition with a consequent suppression of thermal hysteresis without any significant perturbation on the other structural and magnetic properties. In particular, the irradiated film keeps the giant magnetocaloric effect at room temperature opening new perspective on magnetic refrigeration technology for everyday use.
[ { "created": "Wed, 12 Feb 2014 07:59:01 GMT", "version": "v1" } ]
2015-06-18
[ [ "Trassinelli", "Martino", "", "INSP" ], [ "Marangolo", "Massimiliano", "", "INSP" ], [ "Eddrief", "M.", "", "INSP" ], [ "Etgens", "V. H.", "", "INSP" ], [ "Gafton", "V.", "", "INSP" ], [ "Hidki", "S.", "", "INSP" ], [ "Lacaze", "Emmanuelle", "", "INSP" ], [ "Lamour", "Emily", "", "INSP" ], [ "Prigent", "Christophe", "", "INSP" ], [ "Rozet", "Jean-Pierre", "", "INSP" ], [ "Steydli", "S.", "", "INSP" ], [ "Zheng", "Y.", "", "INSP" ], [ "Vernhet", "Dominique", "", "INSP" ] ]
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1402.2757
Deepak Vaid
Deepak Vaid
Quantum Gravity for Dummies
non-technical article; invited contribution for NITK annual magazine "Vitruvian"
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physics.pop-ph gr-qc
http://creativecommons.org/licenses/by-nc-sa/3.0/
I have been asked to write brief, gentle introduction to the basic idea behind the field of "quantum gravity" in 1500 words or less. Doing so appears to be almost as great a challenge as coming up with a consistent theory of quantum gravity. However, I will try. Disclaimer: \emph{The views expressed in this article are my own and do not represent the consensus of the quantum gravity community}.
[ { "created": "Wed, 12 Feb 2014 08:20:56 GMT", "version": "v1" } ]
2014-02-13
[ [ "Vaid", "Deepak", "" ] ]
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1402.2760
Yoann Dieudonn\'e
J\'er\'emie Chalopin, Yoann Dieudonn\'e, Arnaud Labourel, Andrzej Pelc
Rendezvous in Networks in Spite of Delay Faults
null
Distributed Computing 29(3) (2016) 187-205
10.1007/s00446-015-0259-2
null
cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Two mobile agents, starting from different nodes of an unknown network, have to meet at the same node. Agents move in synchronous rounds using a deterministic algorithm. Each agent has a different label, which it can use in the execution of the algorithm, but it does not know the label of the other agent. Agents do not know any bound on the size of the network. In each round an agent decides if it remains idle or if it wants to move to one of the adjacent nodes. Agents are subject to delay faults: if an agent incurs a fault in a given round, it remains in the current node, regardless of its decision. If it planned to move and the fault happened, the agent is aware of it. We consider three scenarios of fault distribution: random (independently in each round and for each agent with constant probability 0 < p < 1), unbounded adver- sarial (the adversary can delay an agent for an arbitrary finite number of consecutive rounds) and bounded adversarial (the adversary can delay an agent for at most c consecutive rounds, where c is unknown to the agents). The quality measure of a rendezvous algorithm is its cost, which is the total number of edge traversals. For random faults, we show an algorithm with cost polynomial in the size n of the network and polylogarithmic in the larger label L, which achieves rendezvous with very high probability in arbitrary networks. By contrast, for unbounded adversarial faults we show that rendezvous is not feasible, even in the class of rings. Under this scenario we give a rendezvous algorithm with cost O(nl), where l is the smaller label, working in arbitrary trees, and we show that \Omega(l) is the lower bound on rendezvous cost, even for the two-node tree. For bounded adversarial faults, we give a rendezvous algorithm working for arbitrary networks, with cost polynomial in n, and logarithmic in the bound c and in the larger label L.
[ { "created": "Wed, 12 Feb 2014 08:34:07 GMT", "version": "v1" }, { "created": "Wed, 14 Oct 2015 17:41:05 GMT", "version": "v2" } ]
2018-12-10
[ [ "Chalopin", "Jérémie", "" ], [ "Dieudonné", "Yoann", "" ], [ "Labourel", "Arnaud", "" ], [ "Pelc", "Andrzej", "" ] ]
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1402.2761
Mikhail Modestov
Mikhail Modestov, Vitaly Bychkov, Gert Brodin, Mattias Marklund, and Axel Brandenburg
Evolution of magnetic field generated by the Kelvin-Helmholtz instability
10 pages, 12 figures, To be submitted to Physics of Plasmas
Phys. Plasmas 21, 072126 (2014)
10.1063/1.4891340
NORDITA-2014-17
physics.plasm-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Kelvin-Helmholtz instability in an ionized plasma is considered with a focus on the generation of magnetic field via the Biermann battery mechanisms. The problem is studied through direct numerical simulations of two counter-directed flows in 2D geometry. The simulations demonstrate the formation of eddies and their further interaction resulting in a large single vortex. At early stages, the generated magnetic field evolves due to the baroclinic term in the induction equation, revealing significantly different structures from the vorticity field, despite the fact that magnetic field and vorticity obey identical equations. At later times, the magnetic field exhibits complex behavior and continues to grow even after a hydrodynamic vortex has developed.
[ { "created": "Wed, 12 Feb 2014 08:45:43 GMT", "version": "v1" } ]
2014-08-11
[ [ "Modestov", "Mikhail", "" ], [ "Bychkov", "Vitaly", "" ], [ "Brodin", "Gert", "" ], [ "Marklund", "Mattias", "" ], [ "Brandenburg", "Axel", "" ] ]
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1402.2768
Alexey Stoykov
A. Stoykov, J.-B. Mosset, U. Greuter, M. Hildebrandt, N. Schlumpf
Use of Silicon Photomultipliers in ZnS:6LiF scintillation neutron detectors: signal extraction in presence of high dark count rates
13 pages, 8 figures; a new section is added, additional discussions and explanations in other sections
null
10.1088/1748-0221/9/06/P06015
null
physics.ins-det
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We report on the possibility of using Silicon Photomultipliers (SiPMs) to detect the scintillation light from neutron conversion in ZnS:6LiF scintillators. The light is collected by wavelength-shifting fibers embedded into the scintillator. The difficulty of extracting neutron signals in the presence of high dark count rates of the SiPMs is addressed by applying a dedicated processing algorithm to analyze the temporal distribution of the SiPM pulses. With a single-channel prototype detection unit we demonstrate a very good neutron signal extraction at SiPM dark count rates of about 1 MHz.
[ { "created": "Wed, 12 Feb 2014 09:24:10 GMT", "version": "v1" }, { "created": "Mon, 26 May 2014 16:19:52 GMT", "version": "v2" } ]
2015-06-18
[ [ "Stoykov", "A.", "" ], [ "Mosset", "J. -B.", "" ], [ "Greuter", "U.", "" ], [ "Hildebrandt", "M.", "" ], [ "Schlumpf", "N.", "" ] ]
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1402.2769
Laurene Jouve
Laur\`ene Jouve, and Gordon Ogilvie
Direct numerical simulations of an inertial wave attractor in linear and nonlinear regimes
Accepted for publication in JFM
null
10.1017/jfm.2014.63
null
astro-ph.SR astro-ph.EP physics.flu-dyn physics.geo-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In a uniformly rotating fluid, inertial waves propagate along rays that are inclined to the rotation axis by an angle that depends on the wave frequency. In closed domains, multiple reflections from the boundaries may cause inertial waves to focus on to particular structures known as wave attractors. Such structures have previously been studied from a theoretical point of view, in laboratory experiments, in linear numerical calculations and in some recent numerical simulations. In the present paper, two-dimensional direct numerical simulations of an inertial wave attractor are presented. In the linear regime, we first recover the results of the linear calculations and asymptotic theory of Ogilvie (2005) who considered a prototypical problem involving the focusing of linear internal waves into a narrow beam centred on a wave attractor in a steady state. The velocity profile of the beam and its scalings with the Ekman number, as well as the asymptotic value of the dissipation rate, are found to be in agreement with the linear theory. We also find that, as the beam builds up around the wave attractor, the power input by the applied force reaches its limiting value more rapidly than the dissipation rate, which saturates only when the beam has reached its final thickness. In the nonlinear regime, the beam is strongly affected and becomes unstable to a subharmonic instability. This instability transfers energy to secondary waves possessing shorter wavelengths and lower frequencies. The onset of the instability of a narrow inertial wave beam is investigated by means of a separate linear analysis and the results, such as the onset of the instability, are found to be consistent with the global simulations of the wave attractor. The excitation of such secondary waves described theoretically in this work has also been seen in recent laboratory experiments on internal gravity waves.
[ { "created": "Wed, 12 Feb 2014 09:31:50 GMT", "version": "v1" } ]
2015-06-18
[ [ "Jouve", "Laurène", "" ], [ "Ogilvie", "Gordon", "" ] ]
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1402.2772
Ralf Metzler
Vladimir V. Palyulin, Aleksei V. Chechkin, and Ralf Metzler
Optimization of random search processes in the presence of an external bias
18 pages, 13 Figures, RevTeX
J. Stat. Mech. (2014) P11031
10.1088/1742-5468/2014/11/P11031
null
cond-mat.stat-mech physics.bio-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the efficiency of random search processes based on L{\'e}vy flights with power-law distributed jump lengths in the presence of an external drift, for instance, an underwater current, an airflow, or simply the bias of the searcher based on prior experience. While L\'evy flights turn out to be efficient search processes when relative to the starting point the target is upstream, in the downstream scenario regular Brownian motion turns out to be advantageous. This is caused by the occurrence of leapovers of L{\'e}vy flights, due to which L{\'e}vy flights typically overshoot a point or small interval. Extending our recent work on biased LF search [V. V. Palyulin, A. V. Chechkin, and R. Metzler, Proc. Natl. Acad. Sci. USA, DOI:10.1073/pnas.1320424111] we establish criteria when the combination of the external stream and the initial distance between the starting point and the target favors L{\'e}vy flights over regular Brownian search. Contrary to the common belief that L{\'e}vy flights with a L{\'e}vy index $\alpha =1$ (i.e., Cauchy flights) are optimal for sparse targets, we find that the optimal value for $\alpha$ may range in the entire interval $(1,2)$ and include Brownian motion as the overall most efficient search strategy.
[ { "created": "Wed, 12 Feb 2014 09:50:00 GMT", "version": "v1" }, { "created": "Fri, 30 May 2014 12:28:23 GMT", "version": "v2" } ]
2014-12-24
[ [ "Palyulin", "Vladimir V.", "" ], [ "Chechkin", "Aleksei V.", "" ], [ "Metzler", "Ralf", "" ] ]
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1402.2773
Chris Winstead
Gopalakrishnan Sundararajan, Chris Winstead and Emmanuel Boutillon
Noisy Gradient Descent Bit-Flip Decoding for LDPC Codes
16 pages, 22 figures, 2 tables
IEEE Trans. on Communications v62 n10 pp3385-3400 (2014)
10.1109/TCOMM.2014.2356458
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A modified Gradient Descent Bit Flipping (GDBF) algorithm is proposed for decoding Low Density Parity Check (LDPC) codes on the binary-input additive white Gaussian noise channel. The new algorithm, called Noisy GDBF (NGDBF), introduces a random perturbation into each symbol metric at each iteration. The noise perturbation allows the algorithm to escape from undesirable local maxima, resulting in improved performance. A combination of heuristic improvements to the algorithm are proposed and evaluated. When the proposed heuristics are applied, NGDBF performs better than any previously reported GDBF variant, and comes within 0.5 dB of the belief propagation algorithm for several tested codes. Unlike other previous GDBF algorithms that provide an escape from local maxima, the proposed algorithm uses only local, fully parallelizable operations and does not require computing a global objective function or a sort over symbol metrics, making it highly efficient in comparison. The proposed NGDBF algorithm requires channel state information which must be obtained from a signal to noise ratio (SNR) estimator. Architectural details are presented for implementing the NGDBF algorithm. Complexity analysis and optimizations are also discussed.
[ { "created": "Wed, 12 Feb 2014 09:57:27 GMT", "version": "v1" }, { "created": "Wed, 25 Jun 2014 17:13:14 GMT", "version": "v2" }, { "created": "Wed, 26 Nov 2014 00:16:39 GMT", "version": "v3" } ]
2014-11-27
[ [ "Sundararajan", "Gopalakrishnan", "" ], [ "Winstead", "Chris", "" ], [ "Boutillon", "Emmanuel", "" ] ]
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1402.2780
Christian Grefe
Christian Grefe
Detector Optimization Studies and Light Higgs Decay into Muons at CLIC
null
null
null
CERN-THESIS-2012-344, BONN-IR-2013-14
physics.ins-det hep-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Compact Linear Collider (CLIC) is a concept for a future $e^{+}e^{-}$ linear collider with a center-of-mass energy of up to 3 TeV. The design of a CLIC experiment is driven by the requirements related to the physics goals, as well as by the experimental conditions. For example, the short time between two bunch crossings of 0.5 ns and the backgrounds due to beamstrahlung have direct impact on the design of a CLIC experiment. The Silicon Detector (SiD) is one of the concepts currently being discussed as a possible detector for the International Linear Collider (ILC). In this thesis we develop a modified version of the SiD simulation model for CLIC, taking into account the specific experimental conditions. In addition, we developed a software tool to investigate the impact of beam-related backgrounds on the detector by overlaying events from different simulated event samples. Moreover, we present full simulation studies, determining the performance of the calorimeter and tracking systems. We show that the track reconstruction in the all-silicon tracker of SiD is robust in the presence of the backgrounds at CLIC. Furthermore, we investigate tungsten as a dense absorber material for the hadronic calorimeter, which allows for the construction of a compact hadronic calorimeter that fulfills the requirements on the energy resolution and shower containment without a significant increase of the coil radius. Finally, the measurement of the decays of light Higgs bosons into two muons is studied in full simulation. We find that with an integrated luminosity of 2 ab$^{-1}$, corresponding to 4 years of data taking at CLIC, the respective Higgs branching ratio can be determined with a statistical uncertainty of approximately 15%.
[ { "created": "Wed, 12 Feb 2014 10:45:00 GMT", "version": "v1" } ]
2014-02-13
[ [ "Grefe", "Christian", "" ] ]
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1402.2782
Roland Glantz
Roland Glantz, Henning Meyerhenke, Christian Schulz
Tree-based Coarsening and Partitioning of Complex Networks
null
null
null
null
cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Many applications produce massive complex networks whose analysis would benefit from parallel processing. Parallel algorithms, in turn, often require a suitable network partition. For solving optimization tasks such as graph partitioning on large networks, multilevel methods are preferred in practice. Yet, complex networks pose challenges to established multilevel algorithms, in particular to their coarsening phase. One way to specify a (recursive) coarsening of a graph is to rate its edges and then contract the edges as prioritized by the rating. In this paper we (i) define weights for the edges of a network that express the edges' importance for connectivity, (ii) compute a minimum weight spanning tree $T^m$ with respect to these weights, and (iii) rate the network edges based on the conductance values of $T^m$'s fundamental cuts. To this end, we also (iv) develop the first optimal linear-time algorithm to compute the conductance values of \emph{all} fundamental cuts of a given spanning tree. We integrate the new edge rating into a leading multilevel graph partitioner and equip the latter with a new greedy postprocessing for optimizing the maximum communication volume (MCV). Experiments on bipartitioning frequently used benchmark networks show that the postprocessing already reduces MCV by 11.3%. Our new edge rating further reduces MCV by 10.3% compared to the previously best rating with the postprocessing in place for both ratings. In total, with a modest increase in running time, our new approach reduces the MCV of complex network partitions by 20.4%.
[ { "created": "Wed, 12 Feb 2014 10:53:01 GMT", "version": "v1" }, { "created": "Thu, 13 Feb 2014 10:56:20 GMT", "version": "v2" } ]
2014-02-14
[ [ "Glantz", "Roland", "" ], [ "Meyerhenke", "Henning", "" ], [ "Schulz", "Christian", "" ] ]
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1402.2783
Domingos Barbosa
Domingos Barbosa, Joao Paulo Barraca, Albert-Jan Boonstra, Rui Aguiar, Arnold van Ardenne, Juande de Santander-Vela, Lourdes Verdes-Montenegro
A Sustainable approach to large ICT Science based infrastructures; the case for Radio Astronomy
7 pages, 2 figures, 1 table, Accepted to the IEEE EnergyCon 2014, Croatia 2014, IEEE Xplorer, 2014
null
10.1109/ENERGYCON.2014.6850498
null
astro-ph.IM physics.ins-det physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Large sensor-based infrastructures for radio astronomy will be among the most intensive data-driven projects in the world, facing very high power demands. The geographically wide distribution of these infrastructures and their associated processing High Performance Computing (HPC) facilities require Green Information and Communications Technologies (ICT). A combination is needed of low power computing, efficient data storage, local data services, Smart Grid power management, and inclusion of Renewable Energies. Here we outline the major characteristics and innovation approaches to address power efficiency and long-term power sustainability for radio astronomy projects, focusing on Green ICT for science.
[ { "created": "Wed, 12 Feb 2014 10:53:46 GMT", "version": "v1" }, { "created": "Fri, 6 Jun 2014 15:04:52 GMT", "version": "v2" } ]
2016-11-18
[ [ "Barbosa", "Domingos", "" ], [ "Barraca", "Joao Paulo", "" ], [ "Boonstra", "Albert-Jan", "" ], [ "Aguiar", "Rui", "" ], [ "van Ardenne", "Arnold", "" ], [ "de Santander-Vela", "Juande", "" ], [ "Verdes-Montenegro", "Lourdes", "" ] ]
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1402.2793
Daniel Krzywicki
D. Krzywicki, {\L}. Faber, A. Byrski, M. Kisiel-Dorohinicki
Computing Agents for Decision Support Systems
null
Future Generation Computer Systems, Volume 37, July 2014, Pages 390-400
10.1016/j.future.2014.02.002
null
cs.MA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In decision support systems, it is essential to get a candidate solution fast, even if it means resorting to an approximation. This constraint introduces a scalability requirement with regard to the kind of heuristics which can be used in such systems. As execution time is bounded, these algorithms need to give better results and scale up with additional computing resources instead of additional time. In this paper, we show how multi-agent systems can fulfil these requirements. We recall as an example the concept of Evolutionary Multi-Agent Systems, which combine evolutionary and agent computing paradigms. We describe several possible implementations and present experimental results demonstrating how additional resources improve the efficiency of such systems.
[ { "created": "Wed, 12 Feb 2014 11:42:36 GMT", "version": "v1" }, { "created": "Wed, 21 May 2014 12:24:08 GMT", "version": "v2" } ]
2014-05-22
[ [ "Krzywicki", "D.", "" ], [ "Faber", "Ł.", "" ], [ "Byrski", "A.", "" ], [ "Kisiel-Dorohinicki", "M.", "" ] ]
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1402.2796
Fabio Celli PhD
Fabio Celli and Massimo Poesio
PR2: A Language Independent Unsupervised Tool for Personality Recognition from Text
4 pages, peer reviewed
null
null
null
cs.CL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present PR2, a personality recognition system available online, that performs instance-based classification of Big5 personality types from unstructured text, using language-independent features. It has been tested on English and Italian, achieving performances up to f=.68.
[ { "created": "Wed, 12 Feb 2014 11:55:31 GMT", "version": "v1" } ]
2014-02-13
[ [ "Celli", "Fabio", "" ], [ "Poesio", "Massimo", "" ] ]
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1402.2798
Krishna Kumar Dr
Hirdesh K. Pharasi, Krishna Kumar, and Jayanta K. Bhattacharjee
Entropy and energy spectra in low-Prandtl-number convection with rotation
12 pages, 8 postscript figures, 1 table, A slightly modified version is to appear in Physical Review E
Physical Review E 89, 023009 (2014)
10.1103/PhysRevE.89.023009
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present results for entropy and kinetic energy spectra computed from direct numerical simulations for low-Prandtl-number ($Pr < 1$) turbulent flow in Rayleigh-B\'{e}nard convection with uniform rotation about a vertical axis. The simulations are performed in a three-dimensional periodic box for a range of Taylor number ($ 0 \leq Ta \leq 10^8$) and reduced Rayleigh number $r = Ra/Ra_{\circ} (Ta, Pr)$ ($1.0 \times 10^2 \le r \le 5.0 \times 10^3$). The Rossby number $Ro$ varies in the range $1.34 \le Ro \le 73$. The entropy spectrum $E_{\theta}(k)$ shows bi-splitting into two branches for lower values of wave number $k$. The entropy in the lower branch scales with $k$ as $k^{-1.4\pm 0.1}$ for $r > 10^3$ for the rotation rates considered here. The entropy in the upper branch also shows scaling behavior with $k$, but the scaling exponent decreases with increasing $Ta$ for all $r$. The energy spectrum $E_v(k)$ is also found to scale with the wave number $k$ as $k^{-1.4\pm 0.1}$ for $r > 10^3$. The scaling exponent for the energy spectrum and the lower branch of the entropy spectrum vary between $-1.7$ to $-2.4$ for lower values of $r$ ($< 10^3$). We also provide some simple arguments based on the variation of the Kolmogorov picture to support the results of simulations.
[ { "created": "Wed, 12 Feb 2014 12:09:31 GMT", "version": "v1" } ]
2014-02-17
[ [ "Pharasi", "Hirdesh K.", "" ], [ "Kumar", "Krishna", "" ], [ "Bhattacharjee", "Jayanta K.", "" ] ]
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1402.2800
Joost van den Berg
J.E. van den Berg (1) and S.C. Mathavan (1) and C. Meinema (1) and J. Nauta (1) and T.H. Nijbroek (1) and K. Jungmann (1) and H.L. Bethlem (2) and S. Hoekstra (1) ((1) University of Groningen The Netherlands, (2) LaserLaB VU University Amsterdam The Netherlands)
Traveling-wave deceleration of SrF molecules
null
Journal of Molecular Spectroscopy, 2014, 300, 22 - 25
10.1016/j.jms.2014.02.004
null
physics.atom-ph physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We report on the production, deceleration and detection of a SrF molecular beam. The molecules are captured from a supersonic expansion and are decelerated in the X$^2\Sigma^+ (v=0, N=1)$ state. We demonstrate the removal of up to 40% of the kinetic energy with a 2 meter long modular traveling-wave decelerator. Our results demonstrate a crucial step towards the preparation of ultracold gases of heavy diatomic molecules for precision spectroscopy.
[ { "created": "Wed, 12 Feb 2014 12:20:35 GMT", "version": "v1" } ]
2014-06-23
[ [ "Berg", "J. E. van den", "" ], [ "Mathavan", "S. C.", "" ], [ "Meinema", "C.", "" ], [ "Nauta", "J.", "" ], [ "Nijbroek", "T. H.", "" ], [ "Jungmann", "K.", "" ], [ "Bethlem", "H. L.", "" ], [ "Hoekstra", "S.", "" ] ]
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1402.2801
Mallesh Pai
Mallesh M. Pai, Aaron Roth and Jonathan Ullman
An Anti-Folk Theorem for Large Repeated Games with Imperfect Monitoring
null
null
null
null
cs.GT cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study infinitely repeated games in settings of imperfect monitoring. We first prove a family of theorems that show that when the signals observed by the players satisfy a condition known as $(\epsilon, \gamma)$-differential privacy, that the folk theorem has little bite: for values of $\epsilon$ and $\gamma$ sufficiently small, for a fixed discount factor, any equilibrium of the repeated game involve players playing approximate equilibria of the stage game in every period. Next, we argue that in large games ($n$ player games in which unilateral deviations by single players have only a small impact on the utility of other players), many monitoring settings naturally lead to signals that satisfy $(\epsilon,\gamma)$-differential privacy, for $\epsilon$ and $\gamma$ tending to zero as the number of players $n$ grows large. We conclude that in such settings, the set of equilibria of the repeated game collapse to the set of equilibria of the stage game.
[ { "created": "Wed, 12 Feb 2014 12:30:36 GMT", "version": "v1" }, { "created": "Wed, 8 Oct 2014 19:05:09 GMT", "version": "v2" } ]
2014-10-09
[ [ "Pai", "Mallesh M.", "" ], [ "Roth", "Aaron", "" ], [ "Ullman", "Jonathan", "" ] ]
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1402.2803
Gennady Koganov A
Gennady A. Koganov and Reuben Shuker
Phase sensitive quantum interference on forbidden transition in ladder scheme
arXiv admin note: substantial text overlap with arXiv:0807.5019
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null
null
physics.optics physics.atom-ph quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A three level ladder system is analyzed and the coherence of initially electric-dipole forbidden transition is calculated. Due to the presence of two laser fields the initially dipole forbidden transition becomes dynamically permitted due to ac Stark effect. It is shown that such transitions exhibit quantum-interference-related phenomena, such as electromagnetically induced transparency, gain without inversion and enhanced refractive index. Gain and dispersion characteristics of such transitions strongly depend upon the relative phase between the driving and the probe fields. Unlike allowed transitions, gain/absorption behavior of ac-Stark allowed transitions exhibit antisymmetric feature on the Rabi sidebands. It is found that absorption/gain spectra possess extremely narrow sub-natural resonances on these ac Stark allowed forbidden transitions. An interesting finding is simultaneous existence of gain and negative dispersion at Autler-Townes transition which may lead to both reduction of the group velocity and amplification of light.
[ { "created": "Wed, 12 Feb 2014 12:36:53 GMT", "version": "v1" } ]
2014-02-13
[ [ "Koganov", "Gennady A.", "" ], [ "Shuker", "Reuben", "" ] ]
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1402.2804
Raoul Trines
R. A. Cairns and R. Bingham and P. Norreys and R. Trines
Laminar shocks in high power laser plasma interactions
7 pages, 6 figures
null
10.1063/1.4864328
null
physics.plasm-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose a theory to describe laminar ion sound structures in a collisionless plasma. Reflection of a small fraction of the upstream ions converts the well known ion acoustic soliton into a structure with a steep potential gradient upstream and with downstream oscillations. The theory provides a simple interpretation of results dating back more than forty years but, more importantly, is shown to provide an explanation for recent observations on laser produced plasmas relevant to inertial fusion and to ion acceleration.
[ { "created": "Wed, 12 Feb 2014 12:40:28 GMT", "version": "v1" } ]
2014-03-05
[ [ "Cairns", "R. A.", "" ], [ "Bingham", "R.", "" ], [ "Norreys", "P.", "" ], [ "Trines", "R.", "" ] ]
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1402.2807
Rui Zhou
Rui Zhou, Chengfei Liu, Jeffrey Xu Yu, Weifa Liang and Yanchun Zhang
Efficient Truss Maintenance in Evolving Networks
null
null
null
null
cs.DB cs.SI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Truss was proposed to study social network data represented by graphs. A k-truss of a graph is a cohesive subgraph, in which each edge is contained in at least k-2 triangles within the subgraph. While truss has been demonstrated as superior to model the close relationship in social networks and efficient algorithms for finding trusses have been extensively studied, very little attention has been paid to truss maintenance. However, most social networks are evolving networks. It may be infeasible to recompute trusses from scratch from time to time in order to find the up-to-date $k$-trusses in the evolving networks. In this paper, we discuss how to maintain trusses in a graph with dynamic updates. We first discuss a set of properties on maintaining trusses, then propose algorithms on maintaining trusses on edge deletions and insertions, finally, we discuss truss index maintenance. We test the proposed techniques on real datasets. The experiment results show the promise of our work.
[ { "created": "Wed, 12 Feb 2014 12:57:06 GMT", "version": "v1" } ]
2014-02-13
[ [ "Zhou", "Rui", "" ], [ "Liu", "Chengfei", "" ], [ "Yu", "Jeffrey Xu", "" ], [ "Liang", "Weifa", "" ], [ "Zhang", "Yanchun", "" ] ]
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