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1402.3133
Roy Shiloh
Roy Shiloh, Yuval Tsur, Yossi Lereah, Boris A. Malomed, Vladlen Shvedov, Cyril Hnatovsky, Wieslaw Krolikowski, and Ady Arie
Unveiling the orbital angular momentum and acceleration of electron beams
2 figures in text, 2 in supplementary
Phys. Rev. Lett. 114, 096102 (2015)
10.1103/PhysRevLett.114.096102
null
physics.acc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
New forms of electron beams have been intensively investigated recently, including vortex beams carrying orbital angular momentum, as well as Airy beams propagating along a parabolic trajectory. Their traits may be harnessed for applications in materials science, electron microscopy and interferometry, and so it is important to measure their properties with ease. Here we show how one may immediately quantify these beams' parameters without need for additional fabrication or non-standard microscopic tools. Our experimental results are backed by numerical simulations and analytic derivation.
[ { "created": "Thu, 13 Feb 2014 13:51:41 GMT", "version": "v1" } ]
2015-03-11
[ [ "Shiloh", "Roy", "" ], [ "Tsur", "Yuval", "" ], [ "Lereah", "Yossi", "" ], [ "Malomed", "Boris A.", "" ], [ "Shvedov", "Vladlen", "" ], [ "Hnatovsky", "Cyril", "" ], [ "Krolikowski", "Wieslaw", "" ], [ "Arie", "Ady", "" ] ]
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1402.3138
Jeremy Chen
Jeremy Chen
Social Networks and the Choices People Make
null
null
null
null
cs.SI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Social marketing is becoming increasingly important in contemporary business. Central to social marketing is quantifying how consumers choose between alternatives and how they influence each other. This work considers a new but simple multinomial choice model for multiple agents connected in a recommendation network based on the explicit modeling of choice adoption behavior. Efficiently computable closed-form solutions, absent from analyses of threshold/cascade models, are obtained together with insights on how the network affects aggregate decision making. A stylized "brand ambassador" selection problem is posed to model targeting in social marketing. Therein, it is shown that a greedy selection strategy leads to solutions achieving at least $1-1/e$ of the optimal value. In an extended example of imposing exogenous controls, a pricing problem is considered wherein it is shown that the single player profit optimization problem is concave, implying the existence of pure strategy equilibria for the associated pricing game.
[ { "created": "Thu, 13 Feb 2014 14:08:46 GMT", "version": "v1" }, { "created": "Fri, 2 May 2014 04:46:34 GMT", "version": "v2" } ]
2014-05-05
[ [ "Chen", "Jeremy", "" ] ]
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1402.3143
Soizic Terrien
Soizic Terrien (LMA), Christophe Vergez (LMA_CNRS), Patricio De La Cuadra (CITA), Beno\^it Fabre (IJLRA)
Is the jet-drive flute model able to produce modulated sounds like Flautas de Chinos ?
Stockholm Music Acoustics Conference, Stockholm : Sweden (2013)
null
null
null
physics.class-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Flautas de chinos - prehispanic chilean flutes played during ritual celebrations in central Chile - are known to produce very particular beating sounds, the so-called sonido rajado. Some previous works have focused on the spectral analysis of these sounds, and on the input impedance of the complex resonator. However, the beating sounds origin remains to be investigated. Throughout this paper, a comparison is provided between the characteristics of both the sound produced by flautas de chinos and a synthesis sound obtained through time-domain simulation of the jet-drive model for flute-like instruments. Jet-drive model appears to be able to produce quasiperiodic sounds similar to sonido rajado. Finally, the analysis of the system dynamics through numerical continuation methods allows to explore the production mechanism of these quasiperiodic regimes.
[ { "created": "Thu, 13 Feb 2014 14:17:00 GMT", "version": "v1" } ]
2014-02-14
[ [ "Terrien", "Soizic", "", "LMA" ], [ "Vergez", "Christophe", "", "LMA_CNRS" ], [ "De La Cuadra", "Patricio", "", "CITA" ], [ "Fabre", "Benoît", "", "IJLRA" ] ]
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1402.3144
Marc Claesen
Marc Claesen, Frank De Smet, Johan A. K. Suykens, Bart De Moor
A Robust Ensemble Approach to Learn From Positive and Unlabeled Data Using SVM Base Models
34 pages, 6 figures, 6 tables. Accepted for publication in Neurocomputing: Special Issue on Advances in Learning with Label Noise
null
10.1016/j.neucom.2014.10.081
null
stat.ML cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a novel approach to learn binary classifiers when only positive and unlabeled instances are available (PU learning). This problem is routinely cast as a supervised task with label noise in the negative set. We use an ensemble of SVM models trained on bootstrap resamples of the training data for increased robustness against label noise. The approach can be considered in a bagging framework which provides an intuitive explanation for its mechanics in a semi-supervised setting. We compared our method to state-of-the-art approaches in simulations using multiple public benchmark data sets. The included benchmark comprises three settings with increasing label noise: (i) fully supervised, (ii) PU learning and (iii) PU learning with false positives. Our approach shows a marginal improvement over existing methods in the second setting and a significant improvement in the third.
[ { "created": "Thu, 13 Feb 2014 14:18:17 GMT", "version": "v1" }, { "created": "Tue, 21 Oct 2014 12:29:58 GMT", "version": "v2" } ]
2015-02-13
[ [ "Claesen", "Marc", "" ], [ "De Smet", "Frank", "" ], [ "Suykens", "Johan A. K.", "" ], [ "De Moor", "Bart", "" ] ]
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A Robust Ensemble Approach to Learn From Positive and Unlabeled Data Using SVM Base Models
http://arxiv.org/abs/1402.3144v2
http://arxiv.org/pdf/1402.3144v2.pdf
https://github.com/claesenm/resvm
true
true
https://paperswithcode.com/paper/a-robust-ensemble-approach-to-learn-from
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1402.3146
Hans Christian \"Ottinger
Hans Christian \"Ottinger
Kinetic Theory and Stochastic Simulation of Field Quanta
17 pages, 6 figures
Phys. Rev. D 90, 085005 (2014)
10.1103/PhysRevD.90.085005
null
hep-th math-ph math.MP physics.comp-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We develop quantum electrodynamics into a kinetic-theory-like evolution equation for electrons, positrons and photons. To keep the "collision rules" simple, we make use of longitudinal and temporal photons in addition to the usual transverse photons. For our explicitly time-dependent approach, we introduce proper time-correlation functions. We then develop a stochastic simulation technique for solving the resulting kinetic equation and we comment on the subtleties associated with gauge invariance, Lorentz invariance and divergent integrals. To illustrate the validity and power of the proposed ideas, we show how a very simple simulation of the dynamics of field quanta can be used to obtain the main contribution to the anomalous magnetic moment of the electron.
[ { "created": "Thu, 13 Feb 2014 14:25:50 GMT", "version": "v1" } ]
2018-03-09
[ [ "Öttinger", "Hans Christian", "" ] ]
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1402.3149
Bei Yu
Bei Yu and Sheqin Dong and Song Chen and Satoshi Goto
Voltage and Level-Shifter Assignment Driven Floorplanning
IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, 2009
IEICE transactions on fundamentals of electronics, communications and computer sciences 92.12 (2009): 2990-2997
10.1587/transfun.E92.A.2990
null
cs.AR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Low Power Design has become a significant requirement when the CMOS technology entered the nanometer era. Multiple-Supply Voltage (MSV) is a popular and effective method for both dynamic and static power reduction while maintaining performance. Level shifters may cause area and Interconnect Length Overhead (ILO), and should be considered at both floorplanning and post-floorplanning stages. In this paper, we propose a two phases algorithm framework, called VLSAF, to solve voltage and level shifter assignment problem. At floorplanning phase, we use a convex cost network flow algorithm to assign voltage and a minimum cost flow algorithm to handle level-shifter assignment. At post-floorplanning phase, a heuristic method is adopted to redistribute white spaces and calculate the positions and shapes of level shifters. The experimental results show VLSAF is effective.
[ { "created": "Thu, 13 Feb 2014 14:32:26 GMT", "version": "v1" } ]
2014-02-14
[ [ "Yu", "Bei", "" ], [ "Dong", "Sheqin", "" ], [ "Chen", "Song", "" ], [ "Goto", "Satoshi", "" ] ]
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1402.3150
Bei Yu
Jhih-Rong Gao and Bei Yu and David Z. Pan
Lithography Hotspot Detection and Mitigation in Nanometer VLSI
ASICON 2013
null
null
null
cs.AR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
With continued feature size scaling, even state of the art semiconductor manufacturing processes will often run into layouts with poor printability and yield. Identifying lithography hotspots is important at both physical verification and early physical design stages. While detailed lithography simulations can be very accurate, they may be too computationally expensive for full-chip scale and physical design inner loops. Meanwhile, pattern matching and machine learning based hotspot detection methods can provide acceptable quality and yet fast turn-around-time for full-chip scale physical verification and design. In this paper, we discuss some key issues and recent results on lithography hotspot detection and mitigation in nanometer VLSI.
[ { "created": "Thu, 13 Feb 2014 14:32:56 GMT", "version": "v1" } ]
2014-02-14
[ [ "Gao", "Jhih-Rong", "" ], [ "Yu", "Bei", "" ], [ "Pan", "David Z.", "" ] ]
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1402.3154
Mark Labinov
Mark S. Labinov
Engineering Predictions in Industrial and Power Flows Using the Retrograde Condensation Curve. Part I-Methodology
6 pages, 7 figures
null
null
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Industrial and power systems rely on engineering predictions of the flow properties of working fluids. The paper proposes a way of the utilization of the vapor quality values along the new retrograde condensation curve in the generation of the void fraction design guidelines and reliable prediction of the saturated liquid specific volumes/densities. The new procedure eliminates the involvement of semi-empirical relationships like rectilinear diameter and other similar models.
[ { "created": "Thu, 13 Feb 2014 14:47:26 GMT", "version": "v1" } ]
2014-02-14
[ [ "Labinov", "Mark S.", "" ] ]
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1402.3163
Xiaohao Yang
Xiaohao Yang and Pavol Juhas and Christopher L. Farrow and Simon J. L. Billinge
xPDFsuite: an end-to-end software solution for high throughput pair distribution function transformation, visualization and analysis
3 pages, 2 figures
null
null
null
cond-mat.mtrl-sci cs.HC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The xPDFsuite software program is described. It is for processing and analyzing atomic pair distribution functions (PDF) from X-ray powder diffraction data. It provides a convenient GUI for SrXplanr and PDFgetX3, allowing the users to easily obtain 1D diffraction pattern from raw 2D diffraction images and then transform them to PDFs. It also bundles PDFgui which allows the users to create structure models and fit to the experiment data. It is specially useful for working with large numbers of datasets such as from high throughout measurements. Some of the key features are: real time PDF transformation and plotting; 2D waterfall, false color heatmap, and 3D contour plotting for multiple datasets; static and dynamic mask editing; geometric calibration of powder diffraction image; configurations and project saving and loading; Pearson correlation analysis on selected datasets; written in Python and support multiple platforms.
[ { "created": "Thu, 13 Feb 2014 14:55:14 GMT", "version": "v1" }, { "created": "Tue, 25 Feb 2014 04:01:14 GMT", "version": "v2" }, { "created": "Mon, 23 Feb 2015 21:13:21 GMT", "version": "v3" } ]
2015-02-25
[ [ "Yang", "Xiaohao", "" ], [ "Juhas", "Pavol", "" ], [ "Farrow", "Christopher L.", "" ], [ "Billinge", "Simon J. L.", "" ] ]
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1402.3173
Jan Sykora
Jan S\'ykora and Michal \v{S}ejnoha and Ji\v{r}\'i \v{S}ejnoha
Homogenization of coupled heat and moisture transport in masonry structures including interfaces
null
null
10.1016/j.amc.2011.02.050
null
cs.CE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Homogenization of a simultaneous heat and moisture flow in a masonry wall is presented in this paper. The principle objective is to examine an impact of the assumed imperfect hydraulic contact on the resulting homogenized properties. Such a contact is characterized by a certain mismatching resistance allowing us to represent a discontinuous evolution of temperature and moisture fields across the interface, which is in general attributed to discontinuous capillary pressures caused by different pore size distributions of the adjacent porous materials. In achieving this, two particular laboratory experiments were performed to provide distributions of temperature and relative humidity in a sample of the masonry wall, which in turn served to extract the corresponding jumps and subsequently to obtain the required interface transition parameters by matching numerical predictions and experimental results. The results suggest a low importance of accounting for imperfect hydraulic contact for the derivation of macroscopic homogenized properties. On the other hand, they strongly support the need for a fully coupled multi-scale analysis due to significant dependence of the homogenized properties on actual moisture gradients and corresponding values of both macroscopic temperature and relative humidity.
[ { "created": "Thu, 13 Feb 2014 15:10:26 GMT", "version": "v1" } ]
2014-02-14
[ [ "Sýkora", "Jan", "" ], [ "Šejnoha", "Michal", "" ], [ "Šejnoha", "Jiří", "" ] ]
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1402.3174
Jan Sykora
J. S\'ykora
Modeling of Degradation Processes in Historical Mortars
null
null
null
null
cs.CE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The aim of presented paper is modeling of degradation processes in historical mortars exposed to moisture impact during freezing. Internal damage caused by ice crystallization in pores is one of the most important factors limiting the service life of historical structures. Coupling the transport processes with the mechanical part will allow us to address the impact of moisture on the durability, strength and stiffness of mortars. This should be accomplished with the help of a complex thermo-hygro-mechanical model representing one of the prime objectives of this work. The proposed formulation is based on the extension of the classical poroelasticity models with the damage mechanics. An example of two-dimensional moisture transport in the environment with temperature below freezing point is presented to support the theoretical derivations.
[ { "created": "Thu, 13 Feb 2014 15:10:39 GMT", "version": "v1" } ]
2014-02-14
[ [ "Sýkora", "J.", "" ] ]
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1402.3175
Mladen Kova\v{c}evi\'c
Mladen Kova\v{c}evi\'c, Ivan Stanojevi\'c, Vojin \v{S}enk
Information-Geometric Equivalence of Transportation Polytopes
6 pages, 1 figure. v2: A remark concerning Frechet-Hoeffding bounds is added
Probl. Inf. Transm., vol. 51, no. 2, pp. 103-109, Apr. 2015
10.1134/S0032946015020027
null
cs.IT math.CO math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper deals with transportation polytopes in the probability simplex (that is, sets of categorical bivariate probability distributions with prescribed marginals). Information projections between such polytopes are studied, and a sufficient condition is described under which these mappings are homeomorphisms.
[ { "created": "Thu, 13 Feb 2014 15:18:04 GMT", "version": "v1" }, { "created": "Mon, 6 Jul 2015 22:00:12 GMT", "version": "v2" } ]
2020-08-13
[ [ "Kovačević", "Mladen", "" ], [ "Stanojević", "Ivan", "" ], [ "Šenk", "Vojin", "" ] ]
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1402.3179
Fernando Oscar Minotti
F. O. Minotti
Longitudinal forces in pinched electric currents
3 pages, no figures
null
null
null
gr-qc physics.plasm-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
It is shown that the theory of Mbelek and Lachi\`eze-Rey predicts longitudinal forces of gravitational origin in pinched current distributions, with magnitudes large enough to have noticeable effects.
[ { "created": "Thu, 13 Feb 2014 15:36:11 GMT", "version": "v1" } ]
2014-02-14
[ [ "Minotti", "F. O.", "" ] ]
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1402.3180
Xuejing Hu
Xue-Jing Hu, You-Jin Yuan, Jun-Xia Wu, Xiao-Hu Zhang, Huan Jia
Research on the Design and Simulation of the CSRe Stochastic Cooling System
5 pages, 9 figures
null
10.1088/1674-1137/39/8/087001
null
physics.acc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Stochastic cooling, as the different cooling mechanism from electron cooling, is designed and constructed on CSRe (experimental Cooling Storage Ring) in HIRFL (Heavy Ion Research Facility in Lanzhou) at present. The beam extracted from CSRm (main Cooling Storage Ring) is injected into the CSRe, and then the secondary beam with large momentum spread and large emittance is produced at the internal target area. This paper is designed to optimize the lattice of CSRe in order to satisfy the requirement of stochastic cooling system. Particle Tracking Method is used and both transverse and longitudinal simulation is made on the basis of the designed lattice. The results indicate that stochastic cooling is suitable for beam cooling with larger momentum spread or larger emittance, and cooling rate is preliminarily confirmed.
[ { "created": "Thu, 13 Feb 2014 15:36:22 GMT", "version": "v1" } ]
2015-09-02
[ [ "Hu", "Xue-Jing", "" ], [ "Yuan", "You-Jin", "" ], [ "Wu", "Jun-Xia", "" ], [ "Zhang", "Xiao-Hu", "" ], [ "Jia", "Huan", "" ] ]
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1402.3184
Ra\'ul Bustos-Mar\'un A
Ra\'ul A. Bustos-Mar\'un, Axel D. Dente, Eduardo A. Coronado, and Horacio M. Pastawski
Tailoring optical fields emitted by nanometric sources
null
null
null
null
cond-mat.mes-hall physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Here we study a simple way of controlling the emitted fields of sub-wavelength nanometric sources. The system consists of arrays of nanoparticles (NPs) embedded in optical active media. The key concept is the careful tuning of NP's damping factors, which changes the eigenmode's decay rates of the whole array. This, at long time, leads to a locking of relative phases and frequencies of individual localized-surfaces-plasmons (LSPs) and, thus, controlls the emitted field. The amplitude of the LSP's oscillations can be kept constant by embedding the system in optical active media. In the case of full loss compensation, this implies that, not only the relative phases, but also the amplitudes of the LSPs remain fixed, leading us, additionally, to interpret the process as a new example of synchronization. The proposed approach can be used as a general way of controlling and designing the electromagnetic fields emitted by nanometric sources, which can find applications in optoelectronic, nanoscale lithography and probing microscopy.
[ { "created": "Thu, 13 Feb 2014 15:41:29 GMT", "version": "v1" } ]
2014-02-14
[ [ "Bustos-Marún", "Raúl A.", "" ], [ "Dente", "Axel D.", "" ], [ "Coronado", "Eduardo A.", "" ], [ "Pastawski", "Horacio M.", "" ] ]
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1402.3190
Pablo Echenique-Robba
Pablo Echenique-Robba
Heating the coffee by looking at it. Or why quantum measurements are physical processes
10 pages, 1 figure
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quant-ph physics.hist-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Using a very simple Gedankenexperiment, I remind the reader that (contrary to what happens in classical mechanics) the energy of a quantum system is inevitably increased just by performing (some) textbook measurements on it. As a direct conclusion, this means that some measurements require the expenditure of a finite amount of energy to be carried out. I also argue that this makes it very difficult to regard measurements as disembodied, immaterial, informational operations, and it forces us to look at them as physical processes just like any other one.
[ { "created": "Thu, 13 Feb 2014 15:52:12 GMT", "version": "v1" } ]
2014-02-14
[ [ "Echenique-Robba", "Pablo", "" ] ]
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1402.3192
Luis L. Sanchez. Soto
B. Stoklasa, L. Motka, J. Rehacek, Z. Hradil, and L. L. Sanchez-Soto
Wavefront sensing reveals optical coherence
Close to the accepted version in Nature Communications
Nat. Commun. 5:3275 (2014)
10.1038/ncomms4275
null
quant-ph physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Wavefront sensing is a set of techniques providing efficient means to ascertain the shape of an optical wavefront or its deviation from an ideal reference. Due to its wide dynamical range and high optical efficiency, the Shack-Hartmann is nowadays the most widely used of these sensors. Here, we show that it actually performs a simultaneous measurement of position and angular spectrum of the incident radiation and, therefore, when combined with tomographic techniques previously developed for quantum information processing, the Shack-Hartmann can be instrumental in reconstructing the complete coherence properties of the signal. We confirm these predictions with an experimental characterization of partially coherent vortex beams, a case that cannot be treated with the standard tools. This seems to indicate that classical methods employed hitherto do not fully exploit the potential of the registered data.
[ { "created": "Thu, 13 Feb 2014 16:01:29 GMT", "version": "v1" } ]
2014-02-14
[ [ "Stoklasa", "B.", "" ], [ "Motka", "L.", "" ], [ "Rehacek", "J.", "" ], [ "Hradil", "Z.", "" ], [ "Sanchez-Soto", "L. L.", "" ] ]
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1402.3193
Christian Bauckhage
Christian Bauckhage
Characterizations and Kullback-Leibler Divergence of Gompertz Distributions
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null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this note, we characterize the Gompertz distribution in terms of extreme value distributions and point out that it implicitly models the interplay of two antagonistic growth processes. In addition, we derive a closed form expressions for the Kullback-Leibler divergence between two Gompertz Distributions. Although the latter is rather easy to obtain, it seems not to have been widely reported before.
[ { "created": "Thu, 13 Feb 2014 16:02:03 GMT", "version": "v1" } ]
2014-02-14
[ [ "Bauckhage", "Christian", "" ] ]
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1402.3198
Martin Kroll
Martin Kroll
A graph theoretic linkage attack on microdata in a metric space
24 pages, 15 figures
null
null
null
cs.CR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Certain methods of analysis require the knowledge of the spatial distances between entities whose data are stored in a microdata table. For instance, such knowledge is necessary and sufficient to perform data mining tasks such as nearest neighbour searches or clustering. However, when inter-record distances are published in addition to the microdata for research purposes, the risk of identity disclosure has to be taken into consideration again. In order to tackle this problem, we introduce a flexible graph model for microdata in a metric space and propose a linkage attack based on realistic assumptions of a data snooper's background knowledge. This attack is based on the idea of finding a maximum approximate common subgraph of two vertex-labelled and edge-weighted graphs. By adapting a standard argument from algorithmic graph theory to our setup, this task is transformed to the maximum clique detection problem in a corresponding product graph. Using a toy example and experimental results on simulated data show that publishing even approximate distances could increase the risk of identity disclosure unreasonably.
[ { "created": "Thu, 13 Feb 2014 16:20:50 GMT", "version": "v1" } ]
2014-02-14
[ [ "Kroll", "Martin", "" ] ]
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1402.3199
Namit Chaturvedi
Namit Chaturvedi and Marcus Gelderie
Weak $\omega$-Regular Trace Languages
12 pages in main body, 4 pages in appendix, 2 figures
null
null
null
cs.FL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Mazurkiewicz traces describe concurrent behaviors of distributed systems. Trace-closed word languages, which are "linearizations" of trace languages, constitute a weaker notion of concurrency but still give us tools to investigate the latter. In this vein, our contribution is twofold. Firstly, we develop definitions that allow classification of $\omega$-regular trace languages in terms of the corresponding trace-closed $\omega$-regular word languages, capturing E-recognizable (reachability) and (deterministically) B\"uchi recognizable languages. Secondly, we demonstrate the first automata-theoretic result that shows the equivalence of $\omega$-regular trace-closed word languages and Boolean combinations of deterministically $I$-diamond B\"uchi recognizable trace-closed languages.
[ { "created": "Thu, 13 Feb 2014 16:21:50 GMT", "version": "v1" } ]
2014-02-14
[ [ "Chaturvedi", "Namit", "" ], [ "Gelderie", "Marcus", "" ] ]
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1402.3206
Abhijit Chavda
A. L. Chavda, L. K. Chavda
Relativistic theory of di-Holeums - quantized gravitational bound states of two micro black holes
28 pages, no figures
null
null
null
physics.gen-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Klein-Gordon equation is solved for di-Holeums (gravitational bound states of two micro black holes) for scalar and vector gravity in its static limit. The relativistic models confirm the predictions of the nonrelativistic Newtonian gravity model, correct to about six significant figures over almost the entire sub-Planck domain. All three models possess a mass range devoid of physics. This is interpreted as evidence that the universe must have more than four dimensions. We show that the formation of Holeums is feasible both in the sub-Planck mass and above-Planck mass ranges.
[ { "created": "Wed, 5 Feb 2014 11:23:09 GMT", "version": "v1" } ]
2014-02-14
[ [ "Chavda", "A. L.", "" ], [ "Chavda", "L. K.", "" ] ]
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1402.3207
Marco Minissale
M. Minissale, E. Congiu, S. Baouche, H. Chaabouni, A. Moudens, F. Dulieu, M. Accolla, S. Cazaux, G. Manico and V. Pirronello
Quantum tunneling of oxygen atoms on very cold surfaces
13 pages, 4 figures
PRL 111, 053201 (2013)
10.1103/PhysRevLett.111.053201
null
cond-mat.mtrl-sci astro-ph.CO physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Any evolving system can change of state via thermal mechanisms (hopping a barrier) or via quantum tunneling. Most of the time, efficient classical mechanisms dominate at high temperatures. This is why an increase of the temperature can initiate the chemistry. We present here an experimental investigation of O-atom diffusion and reactivity on water ice. We explore the 6-25 K temperature range at sub-monolayer surface coverages. We derive the diffusion temperature law and observe the transition from quantum to classical diffusion. Despite of the high mass of O, quantum tunneling is efficient even at 6 K. As a consequence, the solid-state astrochemistry of cold regions should be reconsidered and should include the possibility of forming larger organic molecules than previously expected.
[ { "created": "Thu, 13 Feb 2014 16:36:12 GMT", "version": "v1" } ]
2014-02-14
[ [ "Minissale", "M.", "" ], [ "Congiu", "E.", "" ], [ "Baouche", "S.", "" ], [ "Chaabouni", "H.", "" ], [ "Moudens", "A.", "" ], [ "Dulieu", "F.", "" ], [ "Accolla", "M.", "" ], [ "Cazaux", "S.", "" ], [ "Manico", "G.", "" ], [ "Pirronello", "V.", "" ] ]
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1402.3209
Zenghui Yang
Zeng-hui Yang, John R. Trail, Aurora Pribram-Jones, Kieron Burke, Richard J. Needs, Carsten A. Ullrich
Exact and approximate Kohn-Sham potentials in ensemble density-functional theory
9 pages, 13 figures
Phys. Rev. A 90, 042501 (2014)
10.1103/PhysRevA.90.042501
null
physics.chem-ph cond-mat.mtrl-sci physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We construct exact Kohn-Sham potentials for the ensemble density-functional theory (EDFT) from the ground and excited states of helium. The exchange-correlation (XC) potential is compared with the quasi-local-density approximation and both single determinant and symmetry eigenstate ghost-corrected exact exchange approximations. Symmetry eigenstate Hartree-exchange recovers distinctive features of the exact XC potential and is used to calculate the correlation potential. Unlike the exact case, excitation energies calculated from these approximations depend on ensemble weight, and it is shown that only the symmetry eigenstate method produces an ensemble derivative discontinuity. Differences in asymptotic and near-ground-state behavior of exact and approximate XC potentials are discussed in the context of producing accurate optical gaps.
[ { "created": "Thu, 13 Feb 2014 16:37:55 GMT", "version": "v1" }, { "created": "Mon, 1 Sep 2014 15:10:30 GMT", "version": "v2" } ]
2014-10-08
[ [ "Yang", "Zeng-hui", "" ], [ "Trail", "John R.", "" ], [ "Pribram-Jones", "Aurora", "" ], [ "Burke", "Kieron", "" ], [ "Needs", "Richard J.", "" ], [ "Ullrich", "Carsten A.", "" ] ]
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1402.3210
Philip Schniter
Sundeep Rangan and Philip Schniter and Alyson K. Fletcher and Subrata Sarkar
On the Convergence of Approximate Message Passing with Arbitrary Matrices
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null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Approximate message passing (AMP) methods and their variants have attracted considerable recent attention for the problem of estimating a random vector $\mathbf{x}$ observed through a linear transform $\mathbf{A}$. In the case of large i.i.d. zero-mean Gaussian $\mathbf{A}$, the methods exhibit fast convergence with precise analytic characterizations on the algorithm behavior. However, the convergence of AMP under general transforms $\mathbf{A}$ is not fully understood. In this paper, we provide sufficient conditions for the convergence of a damped version of the generalized AMP (GAMP) algorithm in the case of quadratic cost functions (i.e., Gaussian likelihood and prior). It is shown that, with sufficient damping, the algorithm is guaranteed to converge, although the amount of damping grows with peak-to-average ratio of the squared singular values of the transforms $\mathbf{A}$. This result explains the good performance of AMP on i.i.d. Gaussian transforms $\mathbf{A}$, but also their difficulties with ill-conditioned or non-zero-mean transforms $\mathbf{A}$. A related sufficient condition is then derived for the local stability of the damped GAMP method under general cost functions, assuming certain strict convexity conditions.
[ { "created": "Thu, 13 Feb 2014 16:42:30 GMT", "version": "v1" }, { "created": "Mon, 5 Dec 2016 16:21:11 GMT", "version": "v2" }, { "created": "Fri, 2 Mar 2018 14:31:02 GMT", "version": "v3" } ]
2018-03-05
[ [ "Rangan", "Sundeep", "" ], [ "Schniter", "Philip", "" ], [ "Fletcher", "Alyson K.", "" ], [ "Sarkar", "Subrata", "" ] ]
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1402.3211
Charles Camp Jr
Charles H. Camp Jr. (1), Young Jong Lee (1), John M. Heddleston (2), Christopher M. Hartshorn (1), Angela R. Hight Walker (2), Jeremy N. Rich (3), Justin D. Lathia (4), Marcus T. Cicerone (1) ((1) Biosystems and Biomaterials Division, National Institute of Standards and Technology, Gaithersburg, MD, USA, (2) Semiconductor and Dimensional Metrology Division, National Institute of Standards and Technology, Gaithersburg, MD, USA, (3) Department of Stem Cell Biology and Regenerative Medicine, Cleveland Clinic, Cleveland, OH, USA, (4) Department of Cellular and Molecular Medicine, Cleveland Clinic, Cleveland, OH, USA)
High-Speed Coherent Raman Fingerprint Imaging of Biological Tissues
22 pages (11 main, 11 supplemental), 9 figures (4 main, 5 supplemental; N.B.: reduced resolution for smaller file size-- contact author for full resolution images). This paper was submitted to Nature Photonics on October 2, 2013 (minor corrections applied). This version concatenates the supplementary section to the end of the main text-- rather than a separate file-- No document changes otherwise
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10.1038/nphoton.2014.145
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physics.optics physics.ins-det
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We have developed a coherent Raman imaging platform using broadband coherent anti-Stokes Raman scattering (BCARS) that provides an unprecedented combination of speed, sensitivity, and spectral breadth. The system utilizes a unique configuration of laser sources that probes the Raman spectrum over 3,000 cm$^{-1}$ and generates an especially strong response in the typically weak Raman "fingerprint" region through heterodyne amplification of the anti-Stokes photons with a large nonresonant background (NRB) while maintaining high spectral resolution of $<$ 13 cm$^{-1}$. For histology and pathology, this system shows promise in highlighting major tissue components in a non-destructive, label-free manner. We demonstrate high-speed chemical imaging in two- and three-dimensional views of healthy murine liver and pancreas tissues and interfaces between xenograft brain tumors and the surrounding healthy brain matter.
[ { "created": "Thu, 13 Feb 2014 16:47:26 GMT", "version": "v1" }, { "created": "Sat, 15 Feb 2014 06:14:11 GMT", "version": "v2" } ]
2015-06-18
[ [ "Camp", "Charles H.", "Jr." ], [ "Lee", "Young Jong", "" ], [ "Heddleston", "John M.", "" ], [ "Hartshorn", "Christopher M.", "" ], [ "Walker", "Angela R. Hight", "" ], [ "Rich", "Jeremy N.", "" ], [ "Lathia", "Justin D.", "" ], [ "Cicerone", "Marcus T.", "" ] ]
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1402.3212
Daryl Janzen
Daryl Janzen
Einstein's cosmological considerations
53 pages. Submitted to Eur Phy J (H)
null
null
null
physics.hist-ph gr-qc
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The objective of this paper is not simply to present an historical overview of Einstein's cosmological considerations, but to discuss the central role they played in shaping the paradigm of relativistic cosmology. This, we'll show, was a result of both his actions and, perhaps more importantly, his inactions. Accordingly, discussion won't simply be restricted to Einstein's considerations, as we'll analyse relevant contributions to the relativistic expansion paradigm during the approximately twenty years following Slipher's first redshift measurements in 1912. Our aim is to shed some light on why we think some of the things we do, with the idea that a better understanding of the reasoning that fundamentally influenced the common idea of our expanding universe might help to resolve some of the significant problems that modern cosmology now faces; and we eventually use this knowledge to probe the foundations of the standard model. Much of the information we present, including many of the historical details, we expect will be news to modern practitioners.
[ { "created": "Thu, 13 Feb 2014 16:52:59 GMT", "version": "v1" } ]
2014-02-14
[ [ "Janzen", "Daryl", "" ] ]
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1402.3213
Hamidreza Chitsaz
Aitor Aladren, Sasa Bodiroza, Hamidreza Chitsaz, J.J. Guerrero, Verena Hafner, Kris Hauser, Aleksandar Jevtic, Moslem Kazemi, Bruno Lara, Gonzalo Lopez-Nicolas, Peer Neubert, Peter Protzel, Laurel D. Riek, Niko Sunderhauf, Chee Yap
Proceedings of the 1st Workshop on Robotics Challenges and Vision (RCV2013)
http://compbio.cs.wayne.edu/robotics/rcv2013/proceedings-emb.pdf
null
null
null
cs.RO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Proceedings of the 1st Workshop on Robotics Challenges and Vision (RCV2013)
[ { "created": "Thu, 13 Feb 2014 16:53:55 GMT", "version": "v1" } ]
2014-02-14
[ [ "Aladren", "Aitor", "" ], [ "Bodiroza", "Sasa", "" ], [ "Chitsaz", "Hamidreza", "" ], [ "Guerrero", "J. J.", "" ], [ "Hafner", "Verena", "" ], [ "Hauser", "Kris", "" ], [ "Jevtic", "Aleksandar", "" ], [ "Kazemi", "Moslem", "" ], [ "Lara", "Bruno", "" ], [ "Lopez-Nicolas", "Gonzalo", "" ], [ "Neubert", "Peer", "" ], [ "Protzel", "Peter", "" ], [ "Riek", "Laurel D.", "" ], [ "Sunderhauf", "Niko", "" ], [ "Yap", "Chee", "" ] ]
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1402.3215
Chao-Kai Wen
Chao-Kai Wen and Kai-Kit Wong
Analysis of Compressed Sensing with Spatially-Coupled Orthogonal Matrices
null
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Recent development in compressed sensing (CS) has revealed that the use of a special design of measurement matrix, namely the spatially-coupled matrix, can achieve the information-theoretic limit of CS. In this paper, we consider the measurement matrix which consists of the spatially-coupled \emph{orthogonal} matrices. One example of such matrices are the randomly selected discrete Fourier transform (DFT) matrices. Such selection enjoys a less memory complexity and a faster multiplication procedure. Our contributions are the replica calculations to find the mean-square-error (MSE) of the Bayes-optimal reconstruction for such setup. We illustrate that the reconstruction thresholds under the spatially-coupled orthogonal and Gaussian ensembles are quite different especially in the noisy cases. In particular, the spatially coupled orthogonal matrices achieve the faster convergence rate, the lower measurement rate, and the reduced MSE.
[ { "created": "Thu, 13 Feb 2014 17:00:17 GMT", "version": "v1" } ]
2014-02-14
[ [ "Wen", "Chao-Kai", "" ], [ "Wong", "Kai-Kit", "" ] ]
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1402.3217
Nana Shatashvili
V.I. Berezhiani, N.L. Shatashvili and N.L. Tsintsadze
Electromagnetic Solitons in Degenerate Relativistic Electron-Positron Plasma
Accepted for publication in Physica Scripta
null
10.1088/0031-8949/90/6/068005
null
physics.plasm-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The existence of soliton-like electromagnetic (EM) distributions in a fully degenerate electron-positron plasma is studied applying relativistic hydrodynamic and Maxwell equations. For circularly polarized wave it is found that the soliton solutions exist both in relativistic as well as nonrelativistic degenerate plasmas. Plasma density in the region of soliton pulse localization is reduced considerably. The possibility of plasma cavitation is also shown.
[ { "created": "Thu, 13 Feb 2014 17:01:02 GMT", "version": "v1" }, { "created": "Sun, 23 Feb 2014 06:10:46 GMT", "version": "v2" }, { "created": "Mon, 13 Apr 2015 17:45:43 GMT", "version": "v3" } ]
2015-05-20
[ [ "Berezhiani", "V. I.", "" ], [ "Shatashvili", "N. L.", "" ], [ "Tsintsadze", "N. L.", "" ] ]
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1402.3221
Kyle Beloy
K. Beloy
Hyperfine structure in $^{229g}$Th$^{3+}$ as a probe of the $^{229g}$Th $\rightarrow$ $^{229m}$Th nuclear excitation energy
5 pages
Phys. Rev. Lett. 112, 062503 (2014)
10.1103/PhysRevLett.112.062503
null
physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We identify a potential means to extract the $^{229g}$Th $\rightarrow$ $^{229m}$Th nuclear excitation energy from precision microwave spectroscopy of the $5F_{5/2,7/2}$ hyperfine manifolds in the ion $^{229g}$Th$^{3+}$. The hyperfine interaction mixes this ground fine structure doublet with states of the nuclear isomer, introducing small but observable shifts to the hyperfine sub-levels. We demonstrate how accurate atomic structure calculations may be combined with measurement of the hyperfine intervals to quantify the effects of this mixing. Further knowledge of the magnetic dipole decay rate of the isomer, as recently reported, allows an indirect determination of the nuclear excitation energy.
[ { "created": "Thu, 13 Feb 2014 17:04:24 GMT", "version": "v1" } ]
2014-02-14
[ [ "Beloy", "K.", "" ] ]
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1402.3225
Mohammad Hassan Lotfi
Mohammad Hassan Lotfi, George Kesidis, Saswati Sarkar
Market-Based Power Allocation for a Differentially Priced FDMA System
5 Pages, 2 Figures, Conference Publication
null
null
null
cs.IT cs.GT cs.NI math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we study the problem of differential pricing and QoS assignment by a broadband data provider. In our model, the broadband data provider decides on the power allocated to an end-user not only based on parameters of the transmission medium, but also based on the price the user is willing to pay. In addition, end-users bid the price that they are willing to pay to the BTS based on their channel condition, the throughput they require, and their belief about other users' parameters. We will characterize the optimum power allocation by the BTS which turns out to be a modification of the solution to the well-known water-filling problem. We also characterize the optimum bidding strategy of end-users using the belief of each user about the cell condition.
[ { "created": "Thu, 13 Feb 2014 17:16:23 GMT", "version": "v1" }, { "created": "Mon, 28 Apr 2014 17:09:58 GMT", "version": "v2" }, { "created": "Tue, 30 Sep 2014 20:47:26 GMT", "version": "v3" } ]
2014-10-02
[ [ "Lotfi", "Mohammad Hassan", "" ], [ "Kesidis", "George", "" ], [ "Sarkar", "Saswati", "" ] ]
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1402.3226
Anderson M Amaral MSc.
Anderson M. Amaral, Edilson L. Falc\~ao-Filho, Cid B. de Ara\'ujo
Distinguishing orbital angular momenta and topological charge in optical vortex beams
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null
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physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this work we discuss how the classical orbital angular momentum (OAM) and topological charge (TC) of optical beams with arbitrary spatial phase profiles are related to the local winding density. An analysis for optical vortices (OV) with non-cylindrical symmetry is presented and it is experimentally shown for the first time that OAM and TC may have different values. The new approach also provides a systematic way to determine the uncertainties in measurements of TC and OAM of arbitrary OV.
[ { "created": "Thu, 13 Feb 2014 17:21:39 GMT", "version": "v1" } ]
2014-02-14
[ [ "Amaral", "Anderson M.", "" ], [ "Falcão-Filho", "Edilson L.", "" ], [ "de Araújo", "Cid B.", "" ] ]
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1402.3236
Dieter Bothe
Abdulaziz Ali and Dieter Bothe
A graph-theoretical approach for the computation of connected iso-surfaces based on volumetric data
null
null
null
null
cs.CG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The existing combinatorial methods for iso-surface computation are efficient for pure visualization purposes, but it is known that the resulting iso-surfaces can have holes, and topological problems like missing or wrong connectivity can appear. To avoid such problems, we introduce a graph-theoretical method for the computation of iso-surfaces on cuboid meshes in $\mathbb{R}^3$. The method for the generation of iso-surfaces employs labeled cuboid graphs $G(V,E,\mathcal{F})$ such that $V$ is the set of vertices of a cuboid $C\subset\mathbb{R}^3$, $E$ is the set of edges of $C$ and $\mathcal{F}\,:\,V\rightarrow [0,1]$. The nodes of $G$ are weighted by the values of $\mathcal{F}$ which represents the volumetric information, e.g.\ from a Volume of Fluid method. Using a given iso-level $c\in (0,1)$, we first obtain all iso-points, i.e.\ points where the value $c$ is attained by the edge-interpolated $\mathcal{F}$-field. The iso-surface is then built from iso-elements which are composed of triangles and are such that their polygonal boundary has only iso-points as vertices. All vertices lie on the faces of a single mesh cell. We give a proof that the generated iso-surface is connected up to the boundary of the domain and it can be decomposed into different oriented components. Two different components may have discrete points or line segments in common. The graph-theoretical method for the computation of iso-surfaces developed in this paper enables to recover local information of the iso-surface that can be used e.g.\ to compute discrete mean curvature and to solve surface PDEs. Concerning the computational effort, the resulting algorithm is as efficient as existing combinatorial methods.
[ { "created": "Thu, 13 Feb 2014 17:58:51 GMT", "version": "v1" } ]
2014-02-14
[ [ "Ali", "Abdulaziz", "" ], [ "Bothe", "Dieter", "" ] ]
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1402.3237
Ravishankar Sundararaman
Ravishankar Sundararaman, Kendra Letchworth-Weaver, and T A Arias
A recipe for free-energy functionals of polarizable molecular fluids
13 pages, 7 figures
J. Chem. Phys. 140, 144504 (2014)
10.1063/1.4870653
null
cond-mat.soft physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Classical density-functional theory is the most direct approach to equilibrium structures and free energies of inhomogeneous liquids, but requires the construction of an approximate free-energy functional for each liquid of interest. We present a general recipe for constructing functionals for small-molecular liquids based only on bulk experimental properties and ab initio calculations of a single solvent molecule. This recipe combines the exact free energy of the non-interacting system with fundamental measure theory for the repulsive contribution and a weighted density functional for the short-ranged attractive interactions. We add to these ingredients a weighted polarization functional for the long-range correlations in both the rotational and molecular-polarizability contributions to the dielectric response. We also perform molecular dynamics calculations for the free energy of cavity formation and the high-field dielectric response, and show that our free-energy functional adequately describes these properties (which are key for accurate solvation calculations) for all three solvents in our study: water, chloroform and carbon tetrachloride.
[ { "created": "Thu, 13 Feb 2014 18:00:09 GMT", "version": "v1" } ]
2014-10-10
[ [ "Sundararaman", "Ravishankar", "" ], [ "Letchworth-Weaver", "Kendra", "" ], [ "Arias", "T A", "" ] ]
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1402.3243
Manfred Cuntz
Satish Kumar, Manfred Cuntz and Zdzislaw E. Musielak
Fractal and Multifractal Analysis of the Rise of Oxygen in Earth's Early Atmosphere
20 pages, 3 figures, 3 tables; Chaos, Solitons & Fractals (in press)
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null
null
nlin.CD astro-ph.EP physics.ao-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The rise of oxygen in Earth's atmosphere that occurred 2.4 to 2.2 billion years ago is known as the Earth's Great Oxidation, and its impact on the development of life on Earth has been profound. Thereafter, the increase in Earth's oxygen level persisted, though at a more gradual pace. The proposed underlying mathematical models for these processes are based on physical parameters whose values are currently not well-established owing to uncertainties in geological and biological data. In this paper, a previously developed model of Earth's atmosphere is modified by adding different strengths of noise to account for the parameters' uncertainties. The effects of the noise on the time variations of oxygen, carbon and methane for the early Earth are investigated by using fractal and multifractal analysis. We show that the time variations following the Great Oxidation cannot properly be described by a single fractal dimension because they exhibit multifractal characteristics. The obtained results demonstrate that the time series as obtained exhibit multifractality caused by long-range time correlations.
[ { "created": "Thu, 13 Feb 2014 18:24:27 GMT", "version": "v1" }, { "created": "Sun, 20 Jul 2014 13:26:08 GMT", "version": "v2" }, { "created": "Tue, 16 Dec 2014 16:34:23 GMT", "version": "v3" }, { "created": "Tue, 9 Jun 2015 12:50:36 GMT", "version": "v4" } ]
2015-06-10
[ [ "Kumar", "Satish", "" ], [ "Cuntz", "Manfred", "" ], [ "Musielak", "Zdzislaw E.", "" ] ]
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1402.3247
Pol Blasco Moreno
Pol Blasco and Deniz Gunduz
Learning-Based Optimization of Cache Content in a Small Cell Base Station
Accepted to IEEE ICC 2014, Sydney, Australia. Minor typos corrected. Algorithm MCUCB corrected
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Optimal cache content placement in a wireless small cell base station (sBS) with limited backhaul capacity is studied. The sBS has a large cache memory and provides content-level selective offloading by delivering high data rate contents to users in its coverage area. The goal of the sBS content controller (CC) is to store the most popular contents in the sBS cache memory such that the maximum amount of data can be fetched directly form the sBS, not relying on the limited backhaul resources during peak traffic periods. If the popularity profile is known in advance, the problem reduces to a knapsack problem. However, it is assumed in this work that, the popularity profile of the files is not known by the CC, and it can only observe the instantaneous demand for the cached content. Hence, the cache content placement is optimised based on the demand history. By refreshing the cache content at regular time intervals, the CC tries to learn the popularity profile, while exploiting the limited cache capacity in the best way possible. Three algorithms are studied for this cache content placement problem, leading to different exploitation-exploration trade-offs. We provide extensive numerical simulations in order to study the time-evolution of these algorithms, and the impact of the system parameters, such as the number of files, the number of users, the cache size, and the skewness of the popularity profile, on the performance. It is shown that the proposed algorithms quickly learn the popularity profile for a wide range of system parameters.
[ { "created": "Thu, 13 Feb 2014 18:40:37 GMT", "version": "v1" }, { "created": "Fri, 21 Feb 2014 14:35:39 GMT", "version": "v2" } ]
2014-02-24
[ [ "Blasco", "Pol", "" ], [ "Gunduz", "Deniz", "" ] ]
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1402.3259
Wouter Bos
Wouter Bos (LMFA)
The temperature spectrum generated by frictional heating in isotropic turbulence
null
null
10.1017/jfm.2014.93
null
physics.flu-dyn physics.class-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In every turbulent flow with non-zero viscosity, heat is generated by viscous friction. This heat is then mixed by the velocity field. We consider how heat fluctuations generated this way are injected and distributed over length scales in isotropic turbulence. A triadic closure is derived and numerically integrated. It is shown how the heat fluctuation spectrum depends on the Reynolds and Prandtl numbers.
[ { "created": "Thu, 13 Feb 2014 19:16:00 GMT", "version": "v1" } ]
2015-06-18
[ [ "Bos", "Wouter", "", "LMFA" ] ]
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1402.3261
Didier Henrion
Jan Heller, Didier Henrion (LAAS, CTU/FEE), Tomas Pajdla
Hand-Eye and Robot-World Calibration by Global Polynomial Optimization
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null
null
null
cs.CV math.OC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The need to relate measurements made by a camera to a different known coordinate system arises in many engineering applications. Historically, it appeared for the first time in the connection with cameras mounted on robotic systems. This problem is commonly known as hand-eye calibration. In this paper, we present several formulations of hand-eye calibration that lead to multivariate polynomial optimization problems. We show that the method of convex linear matrix inequality (LMI) relaxations can be used to effectively solve these problems and to obtain globally optimal solutions. Further, we show that the same approach can be used for the simultaneous hand-eye and robot-world calibration. Finally, we validate the proposed solutions using both synthetic and real datasets.
[ { "created": "Thu, 13 Feb 2014 19:17:01 GMT", "version": "v1" } ]
2014-02-14
[ [ "Heller", "Jan", "", "LAAS, CTU/FEE" ], [ "Henrion", "Didier", "", "LAAS, CTU/FEE" ], [ "Pajdla", "Tomas", "" ] ]
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1402.3264
Couvreur Alain
Alain Couvreur, Ayoub Otmani, Jean-Pierre Tillich
Polynomial Time Attack on Wild McEliece Over Quadratic Extensions
The material of this article was presented at the conference EUROCRYPT 2014 (Copenhagen, Denmark) and published in its proceedings. Due to space constraints, most of the proofs were omitted in the proceedings version. The present article is a long revisited version including all the missing proofs
null
null
null
cs.CR cs.IT math.IT math.NT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a polynomial time structural attack against the McEliece system based on Wild Goppa codes from a quadratic finite field extension. This attack uses the fact that such codes can be distinguished from random codes to compute some filtration, that is to say a family of nested subcodes which will reveal their secret algebraic description.
[ { "created": "Thu, 13 Feb 2014 19:26:34 GMT", "version": "v1" }, { "created": "Fri, 24 Jul 2015 19:19:18 GMT", "version": "v2" } ]
2015-07-27
[ [ "Couvreur", "Alain", "" ], [ "Otmani", "Ayoub", "" ], [ "Tillich", "Jean-Pierre", "" ] ]
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Polynomial Time Attack on Wild McEliece Over Quadratic Extensions
http://arxiv.org/abs/1402.3264v2
http://arxiv.org/pdf/1402.3264v2.pdf
https://github.com/anang0g0/Public-key-Cryptsystem-using-Subfield-Subcode
false
false
https://paperswithcode.com/paper/polynomial-time-attack-on-wild-mceliece-over
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1402.3265
Daniel Reitz
D. Reitz, C. Sayrin, B. Albrecht, I. Mazets, R. Mitsch, P. Schneeweiss and A. Rauschenbeutel
Back-Scattering Properties of a Waveguide-Coupled Array of Atoms in the Strongly Non-Paraxial Regime
null
Phys. Rev. A 89, 031804(R) (2014)
10.1103/PhysRevA.89.031804
null
physics.atom-ph quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We experimentally investigate the back-scattering properties of an array of atoms that is evanescently coupled to an optical nanofiber in the strongly non-paraxial regime. We observe that the power and the polarization of the back-scattered light depend on the nanofiber-guided excitation field in a way that significantly deviates from the predictions of a simple model based on two-level atoms and a scalar waveguide. Even though it has been widely used in previous experimental and theoretical studies of waveguide-coupled quantum emitters, this simple model is thus in general not adequate even for a qualitative description of such systems. We develop an ab initio model which includes the multi-level structure of the atoms and the full vectorial properties of the guided field and find very good agreement with our data.
[ { "created": "Thu, 13 Feb 2014 19:27:30 GMT", "version": "v1" } ]
2014-04-01
[ [ "Reitz", "D.", "" ], [ "Sayrin", "C.", "" ], [ "Albrecht", "B.", "" ], [ "Mazets", "I.", "" ], [ "Mitsch", "R.", "" ], [ "Schneeweiss", "P.", "" ], [ "Rauschenbeutel", "A.", "" ] ]
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null
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1402.3269
Tamas Bodai
Tamas Bodai, Valerio Lucarini, Frank Lunkeit, Robert Boschi
Global instability in the Ghil-Sellers model
null
null
10.1007/s00382-014-2206-5
null
physics.ao-ph cond-mat.stat-mech
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Ghil-Sellers energy balance model of Earth's climate, features -- for a considerable range of the solar intensity -- two stable climate states (a warm and a cold snowball Earth), where the bistability results from the celebrated ice-albedo feedback. The unstable solution is obtained and characterized in this paper. We find such unstable states by applying for the first time in a geophysical context the so-called edge tracking method that has been used for studying multiple coexisting states in shear flows. We examine robustness, efficiency, and accuracy properties of the edge tracking algorithm. We find that the procedure is the most efficient when taking a single bisection per cycle. Due to the strong diffusivity of the system trajectories of transient dynamics, initialized between the stable states with respect to the mean temperature, are confined to the heteroclininc trajectory, one which connects the fixed unstable and stable states, after relatively short transient times. This constraint dictates a functional relationship between observables. We characterize such a relationship between the global average temperature and a descriptor of nonequilibrium thermodynamics, the large scale temperature gradient between low and high latitudes. We find that a maximum of the temperature gradient is realized at the same value of the average temperature, about 270 K, largely independent of the strength of incoming solar radiation. We also examine the structural properties of the system defined by the equilibria depending on the solar strength. We construct new bifurcation diagrams in terms of quantities relevant for describing the thermodynamic disequilibrium, such as the temperature gradient and the material entropy production due to heat transport. We compare our results for the EBM to results for the intermediate complexity GCM PlaSim and find an interesting qualitative agreement.
[ { "created": "Thu, 13 Feb 2014 19:52:45 GMT", "version": "v1" }, { "created": "Sun, 10 May 2015 18:09:59 GMT", "version": "v2" } ]
2015-05-20
[ [ "Bodai", "Tamas", "" ], [ "Lucarini", "Valerio", "" ], [ "Lunkeit", "Frank", "" ], [ "Boschi", "Robert", "" ] ]
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1402.3272
Jeremy M. Hutson
Caroline L. Blackley, Paul S. Julienne, Jeremy M. Hutson
Effective-range approximations for resonant scattering of cold atoms
Corrected a plotting error in Fig. 2(a). and clarified corresponding text. Now matches published version. 12 pages, 7 figures
Phys. Rev. A 89, 042701 (2014)
10.1103/PhysRevA.89.042701
null
cond-mat.quant-gas physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Studies of cold atom collisions and few-body interactions often require the energy dependence of the scattering phase shift, which is usually expressed in terms of an effective-range expansion. We use accurate coupled-channel calculations on $^{6}$Li, $^{39}$K and $^{133}$Cs to explore the behavior of the effective range in the vicinity of both broad and narrow Feshbach resonances. We show that commonly used expressions for the effective range break down dramatically for narrow resonances and near the zero-crossings of broad resonances. We present an alternative parametrization of the effective range that is accurate through both the pole and the zero-crossing for both broad and narrow resonances. However, the effective range expansion can still fail at quite low collision energies, particularly around narrow resonances. We demonstrate that an analytical form of an energy and magnetic field-dependent phase shift, based on multichannel quantum defect theory, gives accurate results for the energy-dependent scattering length.
[ { "created": "Thu, 13 Feb 2014 20:02:51 GMT", "version": "v1" }, { "created": "Mon, 17 Mar 2014 10:23:10 GMT", "version": "v2" }, { "created": "Thu, 24 Apr 2014 16:45:12 GMT", "version": "v3" } ]
2014-04-25
[ [ "Blackley", "Caroline L.", "" ], [ "Julienne", "Paul S.", "" ], [ "Hutson", "Jeremy M.", "" ] ]
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1402.3274
Vladimir Yuryev
Arthur N. Yuryev, prepared for publication by V. A. Yuryev
On the Spatial Ambiguity Function
Prepared for publication by V. A. Yuryev in 1991; 26 pages, 4 figures, 1 table. Arthur N. Yuryev (1932/07/05--1990/09/30)
Radiotekhnika (Telecommunications and Radio Engineering, ISSN 0033-8486), issue 10 (October 1994), p. 76--82; received after revision on December 11, 1991
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physics.optics physics.data-an
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The ambiguity function of a spatial signal in the "signal spatial frequency displacement vs antenna linear displacement" coordinates is considered in this paper; in case of a monochromatic signal with known carrier frequency, spatial signal vector angular displacement is considered as the second coordinate. The analysis is made taking into account an external (reradiated or thermal) background which contributes considerable peculiarities in the properties of the spatial ambiguity function. Accuracy of measuring the signal linear or angular displacement and resolution are determined. Examples for the Fresnel and Fraunhofer zones are given.
[ { "created": "Thu, 13 Feb 2014 20:16:51 GMT", "version": "v1" } ]
2014-02-14
[ [ "Yuryev", "Arthur N.", "" ], [ "Yuryev", "prepared for publication by V. A.", "" ] ]
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1402.3277
Marc Zeitoun
Thomas Place (Bordeaux University, France), Marc Zeitoun (Bordeaux University, France)
Separating Regular Languages with First-Order Logic
null
Logical Methods in Computer Science, Volume 12, Issue 1 (March 9, 2016) lmcs:1628
10.2168/LMCS-12(1:5)2016
null
cs.FL cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Given two languages, a separator is a third language that contains the first one and is disjoint from the second one. We investigate the following decision problem: given two regular input languages of finite words, decide whether there exists a first-order definable separator. We prove that in order to answer this question, sufficient information can be extracted from semigroups recognizing the input languages, using a fixpoint computation. This yields an EXPTIME algorithm for checking first-order separability. Moreover, the correctness proof of this algorithm yields a stronger result, namely a description of a possible separator. Finally, we generalize this technique to answer the same question for regular languages of infinite words.
[ { "created": "Thu, 13 Feb 2014 20:21:16 GMT", "version": "v1" }, { "created": "Fri, 29 Jan 2016 16:30:02 GMT", "version": "v2" }, { "created": "Tue, 8 Mar 2016 13:56:54 GMT", "version": "v3" } ]
2017-01-11
[ [ "Place", "Thomas", "", "Bordeaux University, France" ], [ "Zeitoun", "Marc", "", "Bordeaux\n University, France" ] ]
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1402.3281
Christian Schulz
Henning Meyerhenke and Peter Sanders and Christian Schulz
Partitioning Complex Networks via Size-constrained Clustering
null
null
null
null
cs.DC cs.DS cs.SI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The most commonly used method to tackle the graph partitioning problem in practice is the multilevel approach. During a coarsening phase, a multilevel graph partitioning algorithm reduces the graph size by iteratively contracting nodes and edges until the graph is small enough to be partitioned by some other algorithm. A partition of the input graph is then constructed by successively transferring the solution to the next finer graph and applying a local search algorithm to improve the current solution. In this paper, we describe a novel approach to partition graphs effectively especially if the networks have a highly irregular structure. More precisely, our algorithm provides graph coarsening by iteratively contracting size-constrained clusterings that are computed using a label propagation algorithm. The same algorithm that provides the size-constrained clusterings can also be used during uncoarsening as a fast and simple local search algorithm. Depending on the algorithm's configuration, we are able to compute partitions of very high quality outperforming all competitors, or partitions that are comparable to the best competitor in terms of quality, hMetis, while being nearly an order of magnitude faster on average. The fastest configuration partitions the largest graph available to us with 3.3 billion edges using a single machine in about ten minutes while cutting less than half of the edges than the fastest competitor, kMetis.
[ { "created": "Thu, 13 Feb 2014 20:46:31 GMT", "version": "v1" }, { "created": "Tue, 25 Mar 2014 10:50:28 GMT", "version": "v2" } ]
2014-03-26
[ [ "Meyerhenke", "Henning", "" ], [ "Sanders", "Peter", "" ], [ "Schulz", "Christian", "" ] ]
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1402.3285
Ovidiu Cristinel Stoica
Ovidiu Cristinel Stoica
Can the clicks of the detectors provide a complete description of Nature?
Comments welcome!
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quant-ph physics.hist-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
No matter how counterintuitive they are, quantum phenomena are all simple consequences of the laws of Quantum Mechanics. It is not needed to extend the theory with hidden mechanisms or additional principles to explain what Quantum Mechanics already predicts. This indubitable fact is often taken as supporting the view that all we can know about the universe comes from the outcomes of the quantum observations. According to this view, we can even learn the physical laws, in particular the properties of the space, particles, fields, and interactions, solely from the outcomes of the quantum observations. In this article it is shown that the unitary symmetry of the laws of Quantum Mechanics imposes severe restrictions in learning the physical laws of the universe, if we know only the observables and their outcomes.
[ { "created": "Thu, 13 Feb 2014 20:53:25 GMT", "version": "v1" }, { "created": "Wed, 5 Mar 2014 20:55:07 GMT", "version": "v2" } ]
2014-06-26
[ [ "Stoica", "Ovidiu Cristinel", "" ] ]
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1402.3288
Noah Friedkin
Noah E. Friedkin and Eugene C. Johnsen
Two Steps to Obfuscation
null
null
null
null
cs.SI physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This note addresses the historical antecedents of the 1998 PageRank measure of centrality. An identity relation links it to 1990-1991 models of Friedkin and Johnsen.
[ { "created": "Wed, 12 Feb 2014 12:55:31 GMT", "version": "v1" } ]
2014-02-14
[ [ "Friedkin", "Noah E.", "" ], [ "Johnsen", "Eugene C.", "" ] ]
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1402.3292
Alexander Voitkiv B
O. Yu. Andreev, E. A. Mistonova and A. B. Voitkiv
Relativistic transfer ionization and the Breit interaction
5 pages, 4 figures
null
10.1103/PhysRevLett.112.103202
null
physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider correlated transfer ionization in relativistic collisions between a highly charged ion and a light atom. In this process two quasi-free electrons of the atom interact with each other during the short collision time that results in capture of one of them by the ion and emission of the other. We show that this process is strongly influenced by the generalized Breit interaction already at modest relativistic impact energies.
[ { "created": "Thu, 13 Feb 2014 09:47:07 GMT", "version": "v1" } ]
2015-06-18
[ [ "Andreev", "O. Yu.", "" ], [ "Mistonova", "E. A.", "" ], [ "Voitkiv", "A. B.", "" ] ]
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1402.3301
Shafi'i Muhammad Abdulhamid Mr
Shafii M. Abdulhamid, Sulaiman Ahmad, Victor O. Waziri and Fatima N. Jibril
Privacy and National Security Issues in Social Networks: The Challenges
7 pages, 1 table
International Journal of the Computer, the Internet and Management Vol. 19. No.3 (September-December, 2011) pp 14 -20
null
null
cs.SI cs.CY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Online social networks are becoming a major growth point of the internet, as individuals, companies and governments constantly desire to interact with one another, the ability of the internet to deliver this networking capabilities grows stronger. In this paper, we looked at the structure and components of the member profile and the challenges of privacy issues faced by individuals and governments that participate in social networking. We also looked at how it can be used to distort national security, how it became the new weapons of mass mobilization and also how social networks have became the rallying forces for revolutions and social justice.
[ { "created": "Thu, 13 Feb 2014 21:03:05 GMT", "version": "v1" } ]
2014-02-17
[ [ "Abdulhamid", "Shafii M.", "" ], [ "Ahmad", "Sulaiman", "" ], [ "Waziri", "Victor O.", "" ], [ "Jibril", "Fatima N.", "" ] ]
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1402.3305
Martin Klein
Martin Klein, Robert Sanderson, Herbert Van de Sompel, Michael L. Nelson
Real-Time Notification for Resource Synchronization
12 pages, 5 figues, 1 table The experiments were conducted in 2012 as part of the authors' work in the ResourceSync project. For further information and the ResourceSync framework specification please see http://www.openarchives.org/rs/
null
null
null
cs.DC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Web applications frequently leverage resources made available by remote web servers. As resources are created, updated, deleted, or moved, these applications face challenges to remain in lockstep with the server's change dynamics. Several approaches exist to help meet this challenge for use cases where "good enough" synchronization is acceptable. But when strict resource coverage or low synchronization latency is required, commonly accepted Web-based solutions remain elusive. This paper details characteristics of an approach that aims at decreasing synchronization latency while maintaining desired levels of accuracy. The approach builds on pushing change notifications and pulling changed resources and it is explored with an experiment based on a DBpedia Live instance.
[ { "created": "Tue, 11 Feb 2014 21:04:54 GMT", "version": "v1" } ]
2014-02-17
[ [ "Klein", "Martin", "" ], [ "Sanderson", "Robert", "" ], [ "Van de Sompel", "Herbert", "" ], [ "Nelson", "Michael L.", "" ] ]
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1402.3314
Anca Muscholl
Anca Muscholl (LaBRI), Igor Walukiewicz (LaBRI)
Distributed synthesis for acyclic architectures
null
null
null
null
cs.LO cs.SY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The distributed synthesis problem is about constructing cor- rect distributed systems, i.e., systems that satisfy a given specification. We consider a slightly more general problem of distributed control, where the goal is to restrict the behavior of a given distributed system in order to satisfy the specification. Our systems are finite state machines that communicate via rendez-vous (Zielonka automata). We show decidability of the synthesis problem for all omega-regular local specifications, under the restriction that the communication graph of the system is acyclic. This result extends a previous decidability result for a restricted form of local reachability specifications.
[ { "created": "Thu, 13 Feb 2014 21:46:24 GMT", "version": "v1" }, { "created": "Wed, 16 Jul 2014 16:22:26 GMT", "version": "v2" } ]
2014-07-21
[ [ "Muscholl", "Anca", "", "LaBRI" ], [ "Walukiewicz", "Igor", "", "LaBRI" ] ]
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1402.3317
Ali Al-Matouq Ali A Al-Matouq
Ali Al-Matouq and Tyrone Vincent
Multiple Window Moving Horizon Estimation
13 pages
null
null
null
cs.SY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Long horizon lengths in Moving Horizon Estimation are desirable to reach the performance limits of the full information estimator. However, the conventional MHE technique suffers from a number of deficiencies in this respect. First, the problem complexity scales at least linearly with the horizon length selected, which restrains from selecting long horizons if computational limitations are present. Second, there is no monitoring of constraint activity/inactivity which results in conducting redundant constrained minimizations even when no constraints are active. In this study we develop a Multiple-Window Moving Horizon Estimation strategy (MW-MHE) that exploits constraint inactivity to reduce the problem size in long horizon estimation problems. The arrival cost is approximated using the unconstrained full information estimator arrival cost to guarantee stability of the technique. A new horizon length selection criteria is developed based on maximum sensitivity between remote states in time. The development will be in terms of general causal descriptor systems, which includes the standard state space representation as a special case. The potential of the new estimation algorithm will be demonstrated with an example showing a significant reduction in both computation time and numerical errors compared to conventional MHE.
[ { "created": "Thu, 13 Feb 2014 21:49:05 GMT", "version": "v1" } ]
2014-02-17
[ [ "Al-Matouq", "Ali", "" ], [ "Vincent", "Tyrone", "" ] ]
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1402.3319
Boris \v{S}kori\'c
Boris Skoric, Sebastiaan J.A. de Hoogh, Nicola Zannone
Flow-based reputation with uncertainty: Evidence-Based Subjective Logic
null
null
null
null
cs.DC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The concept of reputation is widely used as a measure of trustworthiness based on ratings from members in a community. The adoption of reputation systems, however, relies on their ability to capture the actual trustworthiness of a target. Several reputation models for aggregating trust information have been proposed in the literature. The choice of model has an impact on the reliability of the aggregated trust information as well as on the procedure used to compute reputations. Two prominent models are flow-based reputation (e.g., EigenTrust, PageRank) and Subjective Logic based reputation. Flow-based models provide an automated method to aggregate trust information, but they are not able to express the level of uncertainty in the information. In contrast, Subjective Logic extends probabilistic models with an explicit notion of uncertainty, but the calculation of reputation depends on the structure of the trust network and often requires information to be discarded. These are severe drawbacks. In this work, we observe that the `opinion discounting' operation in Subjective Logic has a number of basic problems. We resolve these problems by providing a new discounting operator that describes the flow of evidence from one party to another. The adoption of our discounting rule results in a consistent Subjective Logic algebra that is entirely based on the handling of evidence. We show that the new algebra enables the construction of an automated reputation assessment procedure for arbitrary trust networks, where the calculation no longer depends on the structure of the network, and does not need to throw away any information. Thus, we obtain the best of both worlds: flow-based reputation and consistent handling of uncertainties.
[ { "created": "Thu, 13 Feb 2014 21:49:52 GMT", "version": "v1" }, { "created": "Tue, 24 Feb 2015 15:55:37 GMT", "version": "v2" } ]
2015-02-25
[ [ "Skoric", "Boris", "" ], [ "de Hoogh", "Sebastiaan J. A.", "" ], [ "Zannone", "Nicola", "" ] ]
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1402.3325
Guilherme Ferrari M.Sc.
G. Gon\c{c}alves Ferrari (1 and 2), T. Boekholt (1) and S.F. Portegies Zwart (1) ((1) Leiden Observatory, Leiden University, The Netherlands, (2) Instituto de F\'isica, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil)
A Keplerian-based Hamiltonian Splitting for Gravitational $N$-body Simulations
13 pages, 6 figures, to be published in MNRAS
null
10.1093/mnras/stu282
null
astro-ph.CO physics.comp-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We developed a Keplerian-based Hamiltonian splitting for solving the gravitational $N$-body problem. This splitting allows us to approximate the solution of a general $N$-body problem by a composition of multiple, independently evolved $2$-body problems. While the Hamiltonian splitting is exact, we show that the composition of independent $2$-body problems results in a non-symplectic non-time-symmetric first-order map. A time-symmetric second-order map is then constructed by composing this basic first-order map with its self-adjoint. The resulting method is precise for each individual $2$-body solution and produces quick and accurate results for near-Keplerian $N$-body systems, like planetary systems or a cluster of stars that orbit a supermassive black hole. The method is also suitable for integration of $N$-body systems with intrinsic hierarchies, like a star cluster with primordial binaries. The superposition of Kepler solutions for each pair of particles makes the method excellently suited for parallel computing; we achieve $\gtrsim 64\%$ efficiency for only $8$ particles per core, but close to perfect scaling for $16384$ particles on a $128$ core distributed-memory computer. We present several implementations in \texttt{Sakura}, one of which is publicly available via the AMUSE framework.
[ { "created": "Thu, 13 Feb 2014 22:24:42 GMT", "version": "v1" } ]
2015-06-18
[ [ "Ferrari", "G. Gonçalves", "", "1 and 2" ], [ "Boekholt", "T.", "" ], [ "Zwart", "S. F. Portegies", "" ] ]
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1402.3329
Justin Hsu
Justin Hsu and Marco Gaboardi and Andreas Haeberlen and Sanjeev Khanna and Arjun Narayan and Benjamin C. Pierce and Aaron Roth
Differential Privacy: An Economic Method for Choosing Epsilon
null
null
10.1109/CSF.2014.35
null
cs.DB
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Differential privacy is becoming a gold standard for privacy research; it offers a guaranteed bound on loss of privacy due to release of query results, even under worst-case assumptions. The theory of differential privacy is an active research area, and there are now differentially private algorithms for a wide range of interesting problems. However, the question of when differential privacy works in practice has received relatively little attention. In particular, there is still no rigorous method for choosing the key parameter $\epsilon$, which controls the crucial tradeoff between the strength of the privacy guarantee and the accuracy of the published results. In this paper, we examine the role that these parameters play in concrete applications, identifying the key questions that must be addressed when choosing specific values. This choice requires balancing the interests of two different parties: the data analyst and the prospective participant, who must decide whether to allow their data to be included in the analysis. We propose a simple model that expresses this balance as formulas over a handful of parameters, and we use our model to choose $\epsilon$ on a series of simple statistical studies. We also explore a surprising insight: in some circumstances, a differentially private study can be more accurate than a non-private study for the same cost, under our model. Finally, we discuss the simplifying assumptions in our model and outline a research agenda for possible refinements.
[ { "created": "Thu, 13 Feb 2014 22:47:13 GMT", "version": "v1" } ]
2018-03-16
[ [ "Hsu", "Justin", "" ], [ "Gaboardi", "Marco", "" ], [ "Haeberlen", "Andreas", "" ], [ "Khanna", "Sanjeev", "" ], [ "Narayan", "Arjun", "" ], [ "Pierce", "Benjamin C.", "" ], [ "Roth", "Aaron", "" ] ]
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1402.3331
Rajeev Nongpiur
R. C. Nongpiur and D. J. Shpak
L-infinity Norm Design of Linear-phase Robust Broadband Beamformers using Constrained Optimization
null
IEEE Transactions on Signal Processing, vol. 61, no. 23, pp. 6034-6046, Dec. 2013
10.1109/TSP.2013.2283463
null
cs.SY cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A new method for the design of linear-phase robust far-field broadband beamformers using constrained optimization is proposed. In the method, the maximum passband ripple and minimum stopband attenuation are ensured to be within prescribed levels, while at the same time maintaining a good linear-phase characteristic at a prescribed group delay in the passband. Since the beamformer is intended primarily for small-sized microphone arrays where the microphone spacing is small relative to the wavelength at low frequencies, the beamformer can become highly sensitive to spatial white noise and array imperfections if a direct minimization of the error is performed. Therefore, to limit the sensitivity of the beamformer the optimization is carried out by constraining a sensitivity parameter, namely, the white noise gain (WNG) to be above prescribed levels across the frequency band. Two novel design variants have been developed. The first variant is formulated as a convex optimization problem where the maximum error in the passband is minimized, while the second variant is formulated as an iterative optimization problem and has the advantage of significantly improving the linear-phase characteristics of the beamformer under any prescribed group delay or linear-array configuration. In the second variant, the passband group-delay deviation is minimized while ensuring that the maximum passband ripple and stopband attenuation are within prescribed levels. To reduce the computational effort in carrying out the optimization, a nonuniform variable sampling approach over the frequency and angular dimensions is used to compute the required parameters. Experiment results show that beamformers designed using the proposed methods have much smaller passband group-delay deviation for similar passband ripple and stopband attenuation than a modified version of an existing method.
[ { "created": "Thu, 13 Feb 2014 22:56:21 GMT", "version": "v1" } ]
2015-06-18
[ [ "Nongpiur", "R. C.", "" ], [ "Shpak", "D. J.", "" ] ]
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1402.3332
Cesar Ghali
Cesar Ghali, Gene Tsudik and Ersin Uzun
Elements of Trust in Named-Data Networking
9 pages, 2 figures
ACM SIGCOMM Computer Communication Review, Volume 44 Issue 5, October 2014
10.1145/2677046.2677049
null
cs.NI cs.CR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In contrast to today's IP-based host-oriented Internet architecture, Information-Centric Networking (ICN) emphasizes content by making it directly addressable and routable. Named Data Networking (NDN) architecture is an instance of ICN that is being developed as a candidate next-generation Internet architecture. By opportunistically caching content within the network (in routers), NDN appears to be well-suited for large-scale content distribution and for meeting the needs of increasingly mobile and bandwidth-hungry applications that dominate today's Internet. One key feature of NDN is the requirement for each content object to be digitally signed by its producer. Thus, NDN should be, in principle, immune to distributing fake (aka "poisoned") content. However, in practice, this poses two challenges for detecting fake content in NDN routers: (1) overhead due to signature verification and certificate chain traversal, and (2) lack of trust context, i.e., determining which public keys are trusted to verify which content. Because of these issues, NDN does not force routers to verify content signatures, which makes the architecture susceptible to content poisoning attacks. This paper explores root causes of, and some cures for, content poisoning attacks in NDN. In the process, it becomes apparent that meaningful mitigation of content poisoning is contingent upon a network-layer trust management architecture, elements of which we construct while carefully justifying specific design choices. This work represents the initial effort towards comprehensive trust management for NDN.
[ { "created": "Thu, 13 Feb 2014 23:11:57 GMT", "version": "v1" }, { "created": "Mon, 17 Feb 2014 17:28:53 GMT", "version": "v2" }, { "created": "Thu, 20 Feb 2014 20:53:19 GMT", "version": "v3" }, { "created": "Wed, 26 Feb 2014 00:49:02 GMT", "version": "v4" }, { "created": "Thu, 30 Oct 2014 18:38:35 GMT", "version": "v5" } ]
2014-10-31
[ [ "Ghali", "Cesar", "" ], [ "Tsudik", "Gene", "" ], [ "Uzun", "Ersin", "" ] ]
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1402.3337
Kishore Konda
Kishore Konda, Roland Memisevic, David Krueger
Zero-bias autoencoders and the benefits of co-adapting features
null
null
null
null
stat.ML cs.CV cs.LG cs.NE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Regularized training of an autoencoder typically results in hidden unit biases that take on large negative values. We show that negative biases are a natural result of using a hidden layer whose responsibility is to both represent the input data and act as a selection mechanism that ensures sparsity of the representation. We then show that negative biases impede the learning of data distributions whose intrinsic dimensionality is high. We also propose a new activation function that decouples the two roles of the hidden layer and that allows us to learn representations on data with very high intrinsic dimensionality, where standard autoencoders typically fail. Since the decoupled activation function acts like an implicit regularizer, the model can be trained by minimizing the reconstruction error of training data, without requiring any additional regularization.
[ { "created": "Thu, 13 Feb 2014 23:37:39 GMT", "version": "v1" }, { "created": "Mon, 10 Nov 2014 21:39:48 GMT", "version": "v2" }, { "created": "Sat, 20 Dec 2014 02:07:47 GMT", "version": "v3" }, { "created": "Sat, 28 Feb 2015 01:15:33 GMT", "version": "v4" }, { "created": "Wed, 8 Apr 2015 14:51:11 GMT", "version": "v5" } ]
2015-04-09
[ [ "Konda", "Kishore", "" ], [ "Memisevic", "Roland", "" ], [ "Krueger", "David", "" ] ]
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1402.3341
Sebastian M. Cioab\u{a}
Sebastian M. Cioab\u{a}, Felix Lazebnik, Weiqiang Li
On the Spectrum of Wenger Graphs
9 pages; accepted for publication to J. Combin. Theory, Series B
null
null
null
math.CO cs.DM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let $q=p^e$, where $p$ is a prime and $e\geq 1$ is an integer. For $m\geq 1$, let $P$ and $L$ be two copies of the $(m+1)$-dimensional vector spaces over the finite field $\mathbb{F}_q$. Consider the bipartite graph $W_m(q)$ with partite sets $P$ and $L$ defined as follows: a point $(p)=(p_1,p_2,\ldots,p_{m+1})\in P$ is adjacent to a line $[l]=[l_1,l_2,\ldots,l_{m+1}]\in L$ if and only if the following $m$ equalities hold: $l_{i+1} + p_{i+1}=l_{i}p_1$ for $i=1,\ldots, m$. We call the graphs $W_m(q)$ Wenger graphs. In this paper, we determine all distinct eigenvalues of the adjacency matrix of $W_m(q)$ and their multiplicities. We also survey results on Wenger graphs.
[ { "created": "Fri, 14 Feb 2014 01:20:21 GMT", "version": "v1" } ]
2014-02-17
[ [ "Cioabă", "Sebastian M.", "" ], [ "Lazebnik", "Felix", "" ], [ "Li", "Weiqiang", "" ] ]
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1402.3343
Xavier Moya
G. V. Brown and S. S. Papell
Regeneration tests of a room temperature magnetic refrigerator and heat pump
Manuscript originally submitted to Journal of Applied Physics, but never resubmitted, and not published elsewhere
null
null
null
physics.ins-det cond-mat.other
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A magnetic heat pump apparatus consisting of a solid magnetic refrigerant, gadolinium, and a liquid regenerator column of ethanol and water has been tested. Utilizing a 7T field, it produced a maximum temperature span of 80 K, and in separate tests, a lowest temperature of 241 K and a highest temperature of 328 K. Thermocouples, placed at intervals along the regenerator tube, permitted measurement of the temperature distribution in the regenerator fluid. No attempt was made to extract refrigeration from the device, but analysis of the temperature distributions shows that 34 watts of refrigeration was produced.
[ { "created": "Fri, 14 Feb 2014 01:23:32 GMT", "version": "v1" } ]
2014-02-17
[ [ "Brown", "G. V.", "" ], [ "Papell", "S. S.", "" ] ]
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1402.3344
Zhang Chong
Chong Zhang, Yu Zhao, Jochen Triesch and Bertram E. Shi
Intrinsically Motivated Learning of Visual Motion Perception and Smooth Pursuit
6 pages, 5 figures
null
null
null
cs.CV q-bio.NC
http://creativecommons.org/licenses/by/3.0/
We extend the framework of efficient coding, which has been used to model the development of sensory processing in isolation, to model the development of the perception/action cycle. Our extension combines sparse coding and reinforcement learning so that sensory processing and behavior co-develop to optimize a shared intrinsic motivational signal: the fidelity of the neural encoding of the sensory input under resource constraints. Applying this framework to a model system consisting of an active eye behaving in a time varying environment, we find that this generic principle leads to the simultaneous development of both smooth pursuit behavior and model neurons whose properties are similar to those of primary visual cortical neurons selective for different directions of visual motion. We suggest that this general principle may form the basis for a unified and integrated explanation of many perception/action loops.
[ { "created": "Fri, 14 Feb 2014 01:27:41 GMT", "version": "v1" }, { "created": "Tue, 25 Feb 2014 03:00:00 GMT", "version": "v2" } ]
2014-02-26
[ [ "Zhang", "Chong", "" ], [ "Zhao", "Yu", "" ], [ "Triesch", "Jochen", "" ], [ "Shi", "Bertram E.", "" ] ]
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1402.3345
Albert Reyna Ocas
Albert S. Reyna and Cid B. de Ara\'ujo
Nonlinearity management of photonic composites and observation of spatial-modulation instability due to quintic nonlinearity
20 pages, 5 figures
Phys. Rev. A 89, 063803 (2014)
10.1103/PhysRevA.89.063803
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a procedure for nonlinearity management of metal-dielectric composites. Varying the volume fraction occupied by silver nanoparticles suspended in acetone we could cancel the refractive index related to the third-order susceptibility, $\chi_{eff}^{(3)}$, and the nonlinear refraction behavior was due to the fifth-order susceptibility, $\chi_{eff}^{(5)}$. Hence, in a cross-phase modulation experiment, we demonstrated for the first time the effect of spatial-modulation- instability due to $\chi_{eff}^{(5)}$. The results are corroborated with numerical calculations based on a generalized Maxwell-Garnet model.
[ { "created": "Fri, 14 Feb 2014 01:51:07 GMT", "version": "v1" } ]
2014-06-18
[ [ "Reyna", "Albert S.", "" ], [ "de Araújo", "Cid B.", "" ] ]
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1402.3346
Guido F. Montufar
Guido Montufar, Nihat Ay, Keyan Ghazi-Zahedi
Geometry and Expressive Power of Conditional Restricted Boltzmann Machines
30 pages, 5 figures, 1 algorithm
null
null
null
cs.NE cs.LG stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Conditional restricted Boltzmann machines are undirected stochastic neural networks with a layer of input and output units connected bipartitely to a layer of hidden units. These networks define models of conditional probability distributions on the states of the output units given the states of the input units, parametrized by interaction weights and biases. We address the representational power of these models, proving results their ability to represent conditional Markov random fields and conditional distributions with restricted supports, the minimal size of universal approximators, the maximal model approximation errors, and on the dimension of the set of representable conditional distributions. We contribute new tools for investigating conditional probability models, which allow us to improve the results that can be derived from existing work on restricted Boltzmann machine probability models.
[ { "created": "Fri, 14 Feb 2014 02:15:09 GMT", "version": "v1" }, { "created": "Wed, 23 Jul 2014 17:00:35 GMT", "version": "v2" }, { "created": "Thu, 12 Mar 2015 15:20:04 GMT", "version": "v3" } ]
2015-03-13
[ [ "Montufar", "Guido", "" ], [ "Ay", "Nihat", "" ], [ "Ghazi-Zahedi", "Keyan", "" ] ]
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1402.3350
Ruta Mehta
Ruta Mehta
Constant Rank Bimatrix Games are PPAD-hard
null
null
null
null
cs.GT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The rank of a bimatrix game (A,B) is defined as rank(A+B). Computing a Nash equilibrium (NE) of a rank-$0$, i.e., zero-sum game is equivalent to linear programming (von Neumann'28, Dantzig'51). In 2005, Kannan and Theobald gave an FPTAS for constant rank games, and asked if there exists a polynomial time algorithm to compute an exact NE. Adsul et al. (2011) answered this question affirmatively for rank-$1$ games, leaving rank-2 and beyond unresolved. In this paper we show that NE computation in games with rank $\ge 3$, is PPAD-hard, settling a decade long open problem. Interestingly, this is the first instance that a problem with an FPTAS turns out to be PPAD-hard. Our reduction bypasses graphical games and game gadgets, and provides a simpler proof of PPAD-hardness for NE computation in bimatrix games. In addition, we get: * An equivalence between 2D-Linear-FIXP and PPAD, improving a result by Etessami and Yannakakis (2007) on equivalence between Linear-FIXP and PPAD. * NE computation in a bimatrix game with convex set of Nash equilibria is as hard as solving a simple stochastic game. * Computing a symmetric NE of a symmetric bimatrix game with rank $\ge 6$ is PPAD-hard. * Computing a (1/poly(n))-approximate fixed-point of a (Linear-FIXP) piecewise-linear function is PPAD-hard. The status of rank-$2$ games remains unresolved.
[ { "created": "Fri, 14 Feb 2014 02:32:42 GMT", "version": "v1" }, { "created": "Sat, 22 Mar 2014 16:57:17 GMT", "version": "v2" } ]
2014-03-25
[ [ "Mehta", "Ruta", "" ] ]
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1402.3352
Rajeev Nongpiur
R. C. Nongpiur, D. J. Shpak, and A. Antoniou
Improved Design Method for Nearly Linear-Phase IIR Filters Using Constrained Optimization
null
IEEE Transactions on Signal Processing, vol. 61, no. 4, Feb. 2013
10.1109/TSP.2012.2231678
null
cs.SY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A new optimization method for the design of nearly linear-phase IIR digital filters that satisfy prescribed specifications is proposed. The group-delay deviation is minimized under the constraint that the passband ripple and stopband attenuation are within the prescribed specifications and either a prescribed or an optimized group delay can be achieved. By representing the filter in terms of a cascade of second-order sections, a non-restrictive stability constraint characterized by a set of linear inequality constraints can be incorporated in the optimization algorithm. An additional feature of the method, which is very useful in certain applications, is that it provides the capability of constraining the maximum gain in transition bands to be below a prescribed level. Experimental results show that filters designed using the proposed method have much lower group-delay deviation for the same passband ripple and stopband attenuation when compared with corresponding filters designed with several state-of-the-art competing methods.
[ { "created": "Fri, 14 Feb 2014 03:07:52 GMT", "version": "v1" } ]
2016-11-18
[ [ "Nongpiur", "R. C.", "" ], [ "Shpak", "D. J.", "" ], [ "Antoniou", "A.", "" ] ]
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1402.3355
Jiajun Zhao
Jiajun Zhao, Tiancheng Han, Zhining Chen, Baowen Li, Cheng-Wei Qiu
Robust acoustic cloaking with density-near-zero materials
null
null
null
null
physics.class-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Using the phenomenon of extraordinary sound transmission (EST) through artificially constructed density-near-zero (DNZ) materials, we propose an alternative approach to realize a very robust acoustic cloaking, which includes one absorber and one projector connected by an energy channel. The elementary unit cell is made of one single-piece homogeneous copper, but it well maintains both the original planar wavefront and the nearly perfect one-dimensional transmission, in the presence of any inserted objects. Furthermore, the overall cloaked space can be increased, designed, and distributed by arbitrarily assembling additional DNZ cells without any upper limit in the total cloaking volume. We demonstrate acoustic cloaking by different combinations of DNZ cells in free space as well as in acoustic waveguides, which enables any objects inside the cells imperceptible along undistorted sound paths.
[ { "created": "Fri, 14 Feb 2014 04:06:15 GMT", "version": "v1" } ]
2014-02-17
[ [ "Zhao", "Jiajun", "" ], [ "Han", "Tiancheng", "" ], [ "Chen", "Zhining", "" ], [ "Li", "Baowen", "" ], [ "Qiu", "Cheng-Wei", "" ] ]
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1402.3364
Muad Abu-Ata
Muad Abu-Ata and Feodor F. Dragan
Metric tree-like structures in real-life networks: an empirical study
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null
null
null
cs.SI cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Based on solid theoretical foundations, we present strong evidences that a number of real-life networks, taken from different domains like Internet measurements, biological data, web graphs, social and collaboration networks, exhibit tree-like structures from a metric point of view. We investigate few graph parameters, namely, the tree-distortion and the tree-stretch, the tree-length and the tree-breadth, the Gromov's hyperbolicity, the cluster-diameter and the cluster-radius in a layering partition of a graph, which capture and quantify this phenomenon of being metrically close to a tree. By bringing all those parameters together, we not only provide efficient means for detecting such metric tree-like structures in large-scale networks but also show how such structures can be used, for example, to efficiently and compactly encode approximate distance and almost shortest path information and to fast and accurately estimate diameters and radii of those networks. Estimating the diameter and the radius of a graph or distances between its arbitrary vertices are fundamental primitives in many data and graph mining algorithms.
[ { "created": "Fri, 14 Feb 2014 05:06:44 GMT", "version": "v1" }, { "created": "Fri, 21 Feb 2014 19:49:31 GMT", "version": "v2" } ]
2014-02-24
[ [ "Abu-Ata", "Muad", "" ], [ "Dragan", "Feodor F.", "" ] ]
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1402.3370
Shyamal Biswas
Shyamal Biswas
Fermi-Dirac Statistics
8 pages, 1 figure. This article has some overlap with Fermi-Dirac statistics: derivation and consequences, S. Chaturvedi and S. Biswas, Resonance 19, 45 (2014)
null
null
null
physics.hist-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Here we have discussed on Fermi-Dirac statistics, in particular, on its brief historical progress, derivation, consequences, applications, etc. Importance of Fermi-Dirac statistics has been discussed even in connection with the current progresses in science. This article is aimed mainly for undergraduate and graduate students.
[ { "created": "Fri, 14 Feb 2014 05:56:50 GMT", "version": "v1" }, { "created": "Sat, 8 Mar 2014 07:14:43 GMT", "version": "v2" }, { "created": "Mon, 23 Feb 2015 06:45:02 GMT", "version": "v3" }, { "created": "Sat, 28 Feb 2015 15:18:44 GMT", "version": "v4" } ]
2015-03-03
[ [ "Biswas", "Shyamal", "" ] ]
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1402.3371
Andrea Ballatore
Andrea Ballatore, Michela Bertolotto, David C. Wilson
An evaluative baseline for geo-semantic relatedness and similarity
GeoInformatica 2014
null
10.1007/s10707-013-0197-8
null
cs.CL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In geographic information science and semantics, the computation of semantic similarity is widely recognised as key to supporting a vast number of tasks in information integration and retrieval. By contrast, the role of geo-semantic relatedness has been largely ignored. In natural language processing, semantic relatedness is often confused with the more specific semantic similarity. In this article, we discuss a notion of geo-semantic relatedness based on Lehrer's semantic fields, and we compare it with geo-semantic similarity. We then describe and validate the Geo Relatedness and Similarity Dataset (GeReSiD), a new open dataset designed to evaluate computational measures of geo-semantic relatedness and similarity. This dataset is larger than existing datasets of this kind, and includes 97 geographic terms combined into 50 term pairs rated by 203 human subjects. GeReSiD is available online and can be used as an evaluation baseline to determine empirically to what degree a given computational model approximates geo-semantic relatedness and similarity.
[ { "created": "Fri, 14 Feb 2014 06:06:47 GMT", "version": "v1" } ]
2014-02-17
[ [ "Ballatore", "Andrea", "" ], [ "Bertolotto", "Michela", "" ], [ "Wilson", "David C.", "" ] ]
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1402.3374
Thippeswamy B M
B M Thippeswamy, S Reshma, K Shaila, K R Venugopal, S S Iyengar, L M Patnaik
EDOCR: Energy Density On-demand Cluster Routing in Wireless Sensor Networks
18 pages,7 Figures
International Journal of Computer Networks & Communications (IJCNC) Vol.6, No.1, January 2014
10.5121/ijcnc.2014.6115
null
cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Energy management is one of the critical parameters in Wireless Sensor Networks. In this paper we attempt for a solution to balance the energy usage for maximizing the network lifetime, increase the packet delivery ratio and throughput. Our proposed algorithm is based on Energy Density of the clusters in Wireless Sensor Networks. The cluster head is selected using two step method and on-demand routing approach to calculate the balanced energy shortest path from source to sink. This unique approach maintains the balanced energy utilization among all nodes by selecting the different cluster heads dynamically. Our simulation results have compared with one of the plain routing scheme (EBRP) and cluster based routing (TSCHS), which shows the significant improvements in minimizing the delay and energy utilization and maximizing the network lifetime and throughput with respect to these works.
[ { "created": "Fri, 14 Feb 2014 06:16:01 GMT", "version": "v1" } ]
2014-02-17
[ [ "Thippeswamy", "B M", "" ], [ "Reshma", "S", "" ], [ "Shaila", "K", "" ], [ "Venugopal", "K R", "" ], [ "Iyengar", "S S", "" ], [ "Patnaik", "L M", "" ] ]
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1402.3382
Rosy Madaan
K.Rajan, Dr.V.Ramalingam, Dr.M.Ganesan
Machine Learning of Phonologically Conditioned Noun Declensions For Tamil Morphological Generators
13 pages. International Journal of Computer Engineering and Applications, 2013
null
null
null
cs.CL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper presents machine learning solutions to a practical problem of Natural Language Generation (NLG), particularly the word formation in agglutinative languages like Tamil, in a supervised manner. The morphological generator is an important component of Natural Language Processing in Artificial Intelligence. It generates word forms given a root and affixes. The morphophonemic changes like addition, deletion, alternation etc., occur when two or more morphemes or words joined together. The Sandhi rules should be explicitly specified in the rule based morphological analyzers and generators. In machine learning framework, these rules can be learned automatically by the system from the training samples and subsequently be applied for new inputs. In this paper we proposed the machine learning models which learn the morphophonemic rules for noun declensions from the given training data. These models are trained to learn sandhi rules using various learning algorithms and the performance of those algorithms are presented. From this we conclude that machine learning of morphological processing such as word form generation can be successfully learned in a supervised manner, without explicit description of rules. The performance of Decision trees and Bayesian machine learning algorithms on noun declensions are discussed.
[ { "created": "Fri, 14 Feb 2014 06:46:44 GMT", "version": "v1" } ]
2014-02-17
[ [ "Rajan", "K.", "" ], [ "Ramalingam", "Dr. V.", "" ], [ "Ganesan", "Dr. M.", "" ] ]
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1402.3384
Weina Wang
Weina Wang, Lei Ying and Junshan Zhang
A Minimax Distortion View of Differentially Private Query Release
null
null
null
null
cs.CR cs.DB cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider the problem of differentially private query release through a synthetic database approach. Departing from the existing approaches that require the query set to be specified in advance, we advocate to devise query-set independent mechanisms, with an ambitious goal of providing accurate answers, while meeting the privacy constraints, for all queries in a general query class. Specifically, a differentially private mechanism is constructed to "encode" rich stochastic structure into the synthetic database, and "customized" companion estimators are then derived to provide accurate answers by making use of all available information, including the mechanism (which is public information) and the query functions. Accordingly, the distortion under the best of this kind of mechanisms at the worst-case query in a general query class, so called the minimax distortion, provides a fundamental characterization of differentially private query release. For the general class of statistical queries, we prove that with the squared-error distortion measure, the minimax distortion is $O(1/n)$ by deriving asymptotically tight upper and lower bounds in the regime that the database size $n$ goes to infinity. The upper bound is achievable by a mechanism $\mathcal{E}$ and its corresponding companion estimators, which points directly to the feasibility of the proposed approach in large databases. We further evaluate the mechanism $\mathcal{E}$ and the companion estimators through experiments on real datasets from Netflix and Facebook. Experimental results show improvement over the state-of-art MWEM algorithm and verify the scaling behavior $O(1/n)$ of the minimax distortion.
[ { "created": "Fri, 14 Feb 2014 06:54:49 GMT", "version": "v1" }, { "created": "Mon, 1 Dec 2014 07:01:08 GMT", "version": "v2" } ]
2014-12-02
[ [ "Wang", "Weina", "" ], [ "Ying", "Lei", "" ], [ "Zhang", "Junshan", "" ] ]
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1402.3388
Jan K\v{r}et\'insk\'y
Javier Esparza and Jan K\v{r}et\'insk\'y
From LTL to Deterministic Automata: A Safraless Compositional Approach
null
null
null
null
cs.LO cs.FL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a new algorithm to construct a deterministic Rabin automaton for an LTL formula $\varphi$. The automaton is the product of a master automaton and an array of slave automata, one for each $G$-subformula of $\varphi$. The slave automaton for $G\psi$ is in charge of recognizing whether $FG\psi$ holds. As opposed to standard determinization procedures, the states of all our automata have a clear logical structure, which allows to apply various optimizations. Our construction subsumes former algorithms for fragments of LTL. Experimental results show improvement in the sizes of the resulting automata compared to existing methods.
[ { "created": "Fri, 14 Feb 2014 07:27:09 GMT", "version": "v1" }, { "created": "Fri, 6 Jun 2014 07:56:35 GMT", "version": "v2" }, { "created": "Wed, 24 Sep 2014 21:21:14 GMT", "version": "v3" } ]
2014-09-26
[ [ "Esparza", "Javier", "" ], [ "Křetínský", "Jan", "" ] ]
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1402.3390
Luca Guidoni
Brice Dubost (MPQ, ICFO), Romain Dubessy (MPQ, LPL), Benjamin Szymanski (MPQ), Samuel Guibal (MPQ), Jean-Pierre Likforman (MPQ), Luca Guidoni (MPQ)
Isotope shifts of natural Sr+ measured by laser fluorescence in a sympathetically cooled Coulomb crystal
19 pages; 5 figures; accepted on Phys. Rev. A (http://pra.aps.org/)
null
10.1103/PhysRevA.89.032504
null
physics.atom-ph physics.optics quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We measured by laser spectroscopy the isotope shifts between naturally-occurring even-isotopes of strontium ions for both the $5s\,\,^2S_{1/2}\to 5p\,\,^2P_{1/2}$ (violet) and the $4d\,\,^2D_{3/2}\to 5p\,\,^2P_{1/2}$ (infrared) dipole-allowed optical transitions. Fluorescence spectra were taken by simultaneous measurements on a two-component Coulomb crystal in a linear Paul trap containing $10^3$--$10^4$ laser-cooled Sr$^+$ ions. The isotope shifts are extracted from the experimental spectra by fitting the data with the analytical solution of the optical Bloch equations describing a three-level atom in interaction with two laser beams. This technique allowed us to increase the precision with respect to previously reported data obtained by optogalvanic spectroscopy or fast atomic-beam techniques. The results for the $5s\,\,^2S_{1/2}\to 5p\,\,^2P_{1/2}$ transition are $\nu_{88}-\nu_{84}=+378(4)$ MHz and $\nu_{88}-\nu_{86}=+170(3)$ MHz, in agreement with previously reported measurements. In the case of the previously unexplored $4d\,\,^2D_{3/2}\to 5p\,\,^2P_{1/2}$ transition we find $\nu_{88}-\nu_{84}=-828(4)$ MHz and $\nu_{88}-\nu_{86}=-402(2)$ MHz. These results provide more data for stringent tests of theoretical calculations of the isotope shifts of alkali-metal-like atoms. Moreover, they simplify the identification and the addressing of Sr$^+$ isotopes for ion frequency standards or quantum-information-processing applications in the case of multi-isotope ion strings.
[ { "created": "Fri, 14 Feb 2014 07:35:04 GMT", "version": "v1" } ]
2015-06-18
[ [ "Dubost", "Brice", "", "MPQ, ICFO" ], [ "Dubessy", "Romain", "", "MPQ, LPL" ], [ "Szymanski", "Benjamin", "", "MPQ" ], [ "Guibal", "Samuel", "", "MPQ" ], [ "Likforman", "Jean-Pierre", "", "MPQ" ], [ "Guidoni", "Luca", "", "MPQ" ] ]
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1402.3392
Fabian Giesen
Fabian Giesen
Interleaved entropy coders
16 pages
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The ANS family of arithmetic coders developed by Jarek Duda has the unique property that encoder and decoder are completely symmetric in the sense that a decoder reading bits will be in the exact same state that the encoder was in when writing those bits---all "buffering" of information is explicitly part of the coder state and identical between encoder and decoder. As a consequence, the output from multiple ABS/ANS coders can be interleaved into the same bitstream without any additional metadata. This allows for very efficient encoding and decoding on CPUs supporting superscalar execution or SIMD instructions, as well as GPU implementations. We also show how interleaving without additional metadata can be implemented for any entropy coder, at some increase in encoder complexity.
[ { "created": "Fri, 14 Feb 2014 07:52:50 GMT", "version": "v1" } ]
2014-02-17
[ [ "Giesen", "Fabian", "" ] ]
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Interleaved entropy coders
http://arxiv.org/abs/1402.3392v1
http://arxiv.org/pdf/1402.3392v1.pdf
https://github.com/j-towns/craystack
false
false
https://paperswithcode.com/paper/interleaved-entropy-coders
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1402.3401
Emiliano De Cristofaro
Abdelberi Chaabane, Terence Chen, Mathieu Cunche, Emiliano De Cristofaro, Arik Friedman, Mohamed Ali Kaafar
Censorship in the Wild: Analyzing Internet Filtering in Syria
A preliminary version of this paper appears in IMC 2014. This is the full version
null
null
null
cs.CY cs.CR cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Internet censorship is enforced by numerous governments worldwide, however, due to the lack of publicly available information, as well as the inherent risks of performing active measurements, it is often hard for the research community to investigate censorship practices in the wild. Thus, the leak of 600GB worth of logs from 7 Blue Coat SG-9000 proxies, deployed in Syria to filter Internet traffic at a country scale, represents a unique opportunity to provide a detailed snapshot of a real-world censorship ecosystem. This paper presents the methodology and the results of a measurement analysis of the leaked Blue Coat logs, revealing a relatively stealthy, yet quite targeted, censorship. We find that traffic is filtered in several ways: using IP addresses and domain names to block subnets or websites, and keywords or categories to target specific content. We show that keyword-based censorship produces some collateral damage as many requests are blocked even if they do not relate to sensitive content. We also discover that Instant Messaging is heavily censored, while filtering of social media is limited to specific pages. Finally, we show that Syrian users try to evade censorship by using web/socks proxies, Tor, VPNs, and BitTorrent. To the best of our knowledge, our work provides the first analytical look into Internet filtering in Syria.
[ { "created": "Fri, 14 Feb 2014 09:13:11 GMT", "version": "v1" }, { "created": "Wed, 19 Feb 2014 07:45:54 GMT", "version": "v2" }, { "created": "Sun, 18 May 2014 16:09:40 GMT", "version": "v3" }, { "created": "Sun, 7 Sep 2014 08:55:11 GMT", "version": "v4" }, { "created": "Wed, 5 Nov 2014 19:31:15 GMT", "version": "v5" } ]
2014-11-06
[ [ "Chaabane", "Abdelberi", "" ], [ "Chen", "Terence", "" ], [ "Cunche", "Mathieu", "" ], [ "De Cristofaro", "Emiliano", "" ], [ "Friedman", "Arik", "" ], [ "Kaafar", "Mohamed Ali", "" ] ]
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1402.3403
Alexandra Gurinovich
V.G. Baryshevsky
Relativistic Split-Cavity Oscillator
15 pages, 3 figures
null
null
null
physics.acc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Using the method of small signal analysis, we study the application potential of relativistic electron beams in split-cavity oscillators (SCO's). A beam-energy change in the SCO as a function of the initial energy of a relativistic beam is considered. It is shown that the small-signal analysis method enables adequate evaluation of SCO parameters needed for effective modulation of a relativistic beam in a split cavity and for HPM generation using SCO's. The range of energies is found for which the effect of self-modulation of the beam density in SCO structures is most pronounced. It is also shown that for beam currents at which the space charge has little effect on the motion of electrons in a beam, the beam in a split-cavity oscillator is effectively self-modulated at beam energies less than ~300-400 keV. The self-modulation drops sharply in the range of energies from 250 to 400 keV, but as the beam current is increased, the effective beam self-modulation becomes appreciable in this range too, as well as even in a higher energy range.
[ { "created": "Fri, 14 Feb 2014 09:17:05 GMT", "version": "v1" } ]
2014-02-17
[ [ "Baryshevsky", "V. G.", "" ] ]
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1402.3405
Daniele Cerra
Daniele Cerra, Mihai Datcu, and Peter Reinartz
Authorship Analysis based on Data Compression
null
null
10.1016/j.patrec.2014.01.019
null
cs.CL cs.DL cs.IR stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper proposes to perform authorship analysis using the Fast Compression Distance (FCD), a similarity measure based on compression with dictionaries directly extracted from the written texts. The FCD computes a similarity between two documents through an effective binary search on the intersection set between the two related dictionaries. In the reported experiments the proposed method is applied to documents which are heterogeneous in style, written in five different languages and coming from different historical periods. Results are comparable to the state of the art and outperform traditional compression-based methods.
[ { "created": "Fri, 14 Feb 2014 09:25:59 GMT", "version": "v1" } ]
2014-02-17
[ [ "Cerra", "Daniele", "" ], [ "Datcu", "Mihai", "" ], [ "Reinartz", "Peter", "" ] ]
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1402.3406
Yi Man
Yi Man and Eric Lauga
The wobbling-to-swimming transition of rotated helices
null
Y. Man and E. Lauga, Phys. Fluids, 25, 071904, 2013
10.1063/1.4812637
null
physics.flu-dyn cond-mat.soft physics.bio-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A growing body of work aims at designing and testing micron-scale synthetic swimmers. One method, inspired by the locomotion of flagellated bacteria, consists of applying a rotating magnetic field to a rigid, helically-shaped, propeller attached to a magnetic head. When the resulting device, termed an artificial bacteria flagellum, is aligned perpendicularly to the applied field, the helix rotates and the swimmer moves forward. Experimental investigation of artificial bacteria flagella shows that at low frequency of the applied field, the axis of the helix does not align perpendicularly to the field but wobbles around the helix, with an angle increasing as the inverse of the field frequency. By numerical computations and asymptotic analysis, we provide a theoretical explanation for this wobbling behavior. We numerically demonstrate the wobbling-to-swimming transition as a function of the helix geometry and the dimensionless Mason number which quantifies the ratio of viscous to magnetic torques. We then employ an asymptotic expansion for near-straight helices to derive an analytical estimate for the wobbling angle allowing to rationalize our computations and past experimental results. These results can help guide future design of artificial helical swimmers.
[ { "created": "Fri, 14 Feb 2014 09:32:37 GMT", "version": "v1" } ]
2014-02-17
[ [ "Man", "Yi", "" ], [ "Lauga", "Eric", "" ] ]
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1402.3416
Thomas Gueudr\'e
Thomas Gueudr\'e, Awadhesh Kumar Dubey, Laurent Talon and Alberto Rosso
Strong pinning of propagation fronts in adverse flow
5 pages, 4 figures
Phys. Rev. E 89, 041004(R) (2014)
10.1103/PhysRevE.89.041004
null
cond-mat.dis-nn physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Reaction fronts evolving in a porous medium exhibit a rich dynamical behaviour. In presence of an adverse flow, experiments show that the front slows down and eventually gets pinned, displaying a particular sawtooth shape. Extensive numerical simulations of the hydrodynamic equations confirm the experimental observations. Here we propose a stylized model, predicting two possible outcomes of the experiments for large adverse flow: either the front develops a sawtooth shape, or it acquires a complicated structure with islands and overhangs. A simple criterion allows to distinguish between the two scenarios and its validity is reproduced by direct hydrodynamical simulations. Our model gives a better understanding of the transition and is relevant in a variety of domains, when the pinning regime is strong and only relies on a small number of sites.
[ { "created": "Fri, 14 Feb 2014 10:14:37 GMT", "version": "v1" }, { "created": "Mon, 24 Feb 2014 13:13:13 GMT", "version": "v2" } ]
2016-10-28
[ [ "Gueudré", "Thomas", "" ], [ "Dubey", "Awadhesh Kumar", "" ], [ "Talon", "Laurent", "" ], [ "Rosso", "Alberto", "" ] ]
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1402.3418
Alexander Kholodov
Alexander S. Kholodov
Scientific works citation analysis
in Russian
null
null
null
cs.DL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Several questions of scientometrics parameters organization are considered. Two new indices for scientific works citation analysis are proposed. They provide more detailed and reliable scientific significance assessment of individual authors and scientific groups basing on the publication activity
[ { "created": "Fri, 14 Feb 2014 10:19:55 GMT", "version": "v1" } ]
2014-02-17
[ [ "Kholodov", "Alexander S.", "" ] ]
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1402.3426
Reza Shokri
Reza Shokri
Privacy Games: Optimal User-Centric Data Obfuscation
null
null
10.1515/popets-2015-0024
null
cs.CR cs.GT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we design user-centric obfuscation mechanisms that impose the minimum utility loss for guaranteeing user's privacy. We optimize utility subject to a joint guarantee of differential privacy (indistinguishability) and distortion privacy (inference error). This double shield of protection limits the information leakage through obfuscation mechanism as well as the posterior inference. We show that the privacy achieved through joint differential-distortion mechanisms against optimal attacks is as large as the maximum privacy that can be achieved by either of these mechanisms separately. Their utility cost is also not larger than what either of the differential or distortion mechanisms imposes. We model the optimization problem as a leader-follower game between the designer of obfuscation mechanism and the potential adversary, and design adaptive mechanisms that anticipate and protect against optimal inference algorithms. Thus, the obfuscation mechanism is optimal against any inference algorithm.
[ { "created": "Fri, 14 Feb 2014 10:41:18 GMT", "version": "v1" }, { "created": "Mon, 4 Aug 2014 22:36:10 GMT", "version": "v2" }, { "created": "Wed, 27 May 2015 20:40:01 GMT", "version": "v3" } ]
2015-05-29
[ [ "Shokri", "Reza", "" ] ]
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1402.3427
Sotirios Chatzis
Sotirios P. Chatzis
Indian Buffet Process Deep Generative Models for Semi-Supervised Classification
null
null
null
null
cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Deep generative models (DGMs) have brought about a major breakthrough, as well as renewed interest, in generative latent variable models. However, DGMs do not allow for performing data-driven inference of the number of latent features needed to represent the observed data. Traditional linear formulations address this issue by resorting to tools from the field of nonparametric statistics. Indeed, linear latent variable models imposed an Indian Buffet Process (IBP) prior have been extensively studied by the machine learning community; inference for such models can been performed either via exact sampling or via approximate variational techniques. Based on this inspiration, in this paper we examine whether similar ideas from the field of Bayesian nonparametrics can be utilized in the context of modern DGMs in order to address the latent variable dimensionality inference problem. To this end, we propose a novel DGM formulation, based on the imposition of an IBP prior. We devise an efficient Black-Box Variational inference algorithm for our model, and exhibit its efficacy in a number of semi-supervised classification experiments. In all cases, we use popular benchmark datasets, and compare to state-of-the-art DGMs.
[ { "created": "Fri, 14 Feb 2014 10:44:48 GMT", "version": "v1" }, { "created": "Sun, 30 Aug 2015 18:41:41 GMT", "version": "v2" }, { "created": "Fri, 8 Jul 2016 19:37:54 GMT", "version": "v3" }, { "created": "Sat, 16 Jul 2016 14:11:47 GMT", "version": "v4" }, { "created": "Sun, 6 Aug 2017 21:27:48 GMT", "version": "v5" }, { "created": "Fri, 9 Feb 2018 21:25:41 GMT", "version": "v6" }, { "created": "Sat, 31 Mar 2018 13:38:19 GMT", "version": "v7" } ]
2018-04-03
[ [ "Chatzis", "Sotirios P.", "" ] ]
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1402.3434
Emeric Balogh
Katalin Kov\'acs, Emeric Balogh, J\'anos Hebling, Valer Tosa, Katalin Varj\'u
Quasi-phase-matching high-harmonic radiation using chirped THz pulses
null
Phys. Rev. Lett. 108, 193903 (2012)
10.1103/PhysRevLett.108.193903
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
High-order harmonic generation in the presence of a chirped THz pulse is investigated numerically with a complete 3D non-adiabatic model. The assisting THz pulse illuminates the HHG gas cell laterally inducing quasi-phase-matching. We demonstrate that it is possible to compensate the phase mismatch during propagation and extend the macroscopic cutoff of a propagated strong IR pulse to the single-dipole cutoff. We obtain two orders of magnitude increase in the harmonic efficiency of cutoff harmonics ($\approx$170 eV) using a THz pulse of constant wavelength, and a further factor of 3 enhancement when a chirped THz pulse is used.
[ { "created": "Fri, 14 Feb 2014 11:12:49 GMT", "version": "v1" } ]
2014-02-17
[ [ "Kovács", "Katalin", "" ], [ "Balogh", "Emeric", "" ], [ "Hebling", "János", "" ], [ "Tosa", "Valer", "" ], [ "Varjú", "Katalin", "" ] ]
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1402.3435
Jens Ma{\ss}berg
Jens Ma{\ss}berg
Generalized Huffman Coding for Binary Trees with Choosable Edge Lengths
9 pages
Information Processing Letters 115 (4), pp. 502-506 (2015)
10.1016/j.ipl.2014.11.013
null
cs.IT cs.DS math.CO math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we study binary trees with choosable edge lengths, in particular rooted binary trees with the property that the two edges leading from every non-leaf to its two children are assigned integral lengths $l_1$ and $l_2$ with $l_1+l_2 =k$ for a constant $k\in\mathbb{N}$. The depth of a leaf is the total length of the edges of the unique root-leaf-path. We present a generalization of the Huffman Coding that can decide in polynomial time if for given values $d_1,...,d_n\in\mathbb{N}_{\geq 0}$ there exists a rooted binary tree with choosable edge lengths with $n$ leaves having depths at most $d_1,..., d_n$.
[ { "created": "Fri, 14 Feb 2014 11:13:36 GMT", "version": "v1" }, { "created": "Fri, 12 Sep 2014 19:25:56 GMT", "version": "v2" } ]
2016-08-08
[ [ "Maßberg", "Jens", "" ] ]
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1402.3437
Edouard Brezin
Edouard Brezin
Wilson's renormalization group: a paradigmatic shift
null
null
10.1007/s10955-014-0971-5
null
physics.hist-ph cond-mat.stat-mech hep-th
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A personal and subjective recollection, concerning mainly Wilson's lectures delivered over the spring of 1972 at Princeton University (summary of a talk at Cornell University on November 16, 2013 at the occasion of the memorial Kenneth G. Wilson conference).
[ { "created": "Fri, 14 Feb 2014 11:20:17 GMT", "version": "v1" } ]
2015-06-18
[ [ "Brezin", "Edouard", "" ] ]
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1402.3443
Andres Santos
Andr\'es Santos, Santos B. Yuste, Mariano L\'opez de Haro, Gerardo Odriozola, and Vitaliy Ogarko
A simple effective rule to estimate the jamming packing fraction of polydisperse hard spheres
5 pages, 3 figures; v2: slight changes plus new references
Phys. Rev. E 89, 040302(R) (2014)
10.1103/PhysRevE.89.040302
null
cond-mat.stat-mech cond-mat.mtrl-sci cond-mat.soft physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A recent proposal in which the equation of state of a polydisperse hard-sphere mixture is mapped onto that of the one-component fluid is extrapolated beyond the freezing point to estimate the jamming packing fraction $\phi_\text{J}$ of the polydisperse system as a simple function of $M_1M_3/M_2^2$, where $M_k$ is the $k$th moment of the size distribution. An analysis of experimental and simulation data of $\phi_\text{J}$ for a large number of different mixtures shows a remarkable general agreement with the theoretical estimate. To give extra support to the procedure, simulation data for seventeen mixtures in the high-density region are used to infer the equation of state of the pure hard-sphere system in the metastable region. An excellent collapse of the inferred curves up to the glass transition and a significant narrowing of the different out-of-equilibrium glass branches all the way to jamming are observed. Thus, the present approach provides an extremely simple criterion to unify in a common framework and to give coherence to data coming from very different polydisperse hard-sphere mixtures.
[ { "created": "Fri, 14 Feb 2014 11:54:01 GMT", "version": "v1" }, { "created": "Wed, 30 Apr 2014 18:22:28 GMT", "version": "v2" } ]
2014-05-01
[ [ "Santos", "Andrés", "" ], [ "Yuste", "Santos B.", "" ], [ "de Haro", "Mariano López", "" ], [ "Odriozola", "Gerardo", "" ], [ "Ogarko", "Vitaliy", "" ] ]
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1402.3444
Francesco Silvestri
Francesco Silvestri
Subgraph Enumeration in Massive Graphs
null
null
null
null
cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider the problem of enumerating all instances of a given pattern graph in a large data graph. Our focus is on determining the input/output (I/O) complexity of this problem. Let $E$ be the number of edges in the data graph, $k=O(1)$ be the number of vertices in the pattern graph, $B$ be the block length, and $M$ be the main memory size. The main results of the paper are two algorithms that enumerate all instances of the pattern graph. The first one is a deterministic algorithm that exploits a suitable independent set of the pattern graph of size $1\leq s \leq k/2$ and requires $O\left(E^{k-s}/\left(BM^{k-s-1}\right)\right)$ I/Os. The second algorithm is a randomized algorithm that enumerates all instances in $O\left(E^{k/2}/\left(BM^{k/2-1}\right)\right)$ expected I/Os; the same bound also applies with high probability under some assumptions. A lower bound shows that the deterministic algorithm is optimal for some pattern graphs with $s=k/2$ (e.g., paths and cycles of even length, meshes of even side), while the randomized algorithm is optimal for a wide class of pattern graphs, called Alon class (e.g., cliques, cycles and every graph with a perfect matching).
[ { "created": "Fri, 14 Feb 2014 12:01:47 GMT", "version": "v1" }, { "created": "Tue, 8 Jul 2014 11:43:19 GMT", "version": "v2" }, { "created": "Thu, 12 Nov 2015 10:42:45 GMT", "version": "v3" } ]
2015-11-13
[ [ "Silvestri", "Francesco", "" ] ]
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1402.3445
Daniele Spiga
L. Proserpio, S. Basso, F. Borsa, O. Citterio, M. Civitani, M. Ghigo, G. Pareschi, B. Salmaso, G. Sironi, D. Spiga, G. Tagliaferri, A. D'Este, R. Dall'Igna, M. Silvestri, G. Parodi, F. Martelli, M. Bavdaz, E. Wille
Evaluation of the surface strength of glass plates shaped by hot slumping process
Accepted for publication in Optical Enginnering (Jun 26, 2014)
null
10.1117/1.OE.53.8.085101
null
astro-ph.IM astro-ph.HE physics.ins-det
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Hot Slumping Technology is under development by several research groups in the world for the realization of grazing-incidence segmented mirrors for X-ray astronomy, based on thin glass plates shaped over a mould at temperatures above the transformation point. The performed thermal cycle and related operations might have effects on the strength characteristics of the glass, with consequences on the structural design of the elemental optical modules and consecutively on the entire X-ray optic for large astronomical missions like IXO and ATHENA. The mechanical strength of glass plates after they underwent the slumping process was tested through destructive double-ring tests in the context of a study performed by the Astronomical Observatory of Brera with the collaboration of Stazione Sperimentale del Vetro and BCV Progetti. The entire study has been realized on more than 200 D263 Schott borosilicate glass specimens of dimension 100 mm x 100 mm and thickness 0.4 mm, either flat or bent at a Radius of Curvature of 1000 mm through the particular pressure assisted hot slumping process developed by INAF-OAB. The collected experimental data have been compared to non-linear FEM analyses and treated with Weibull statistic to assess the current IXO glass X-ray telescope design, in terms of survival probability, when subject to static and acoustic loads characteristic of the launch phase. The paper describes the activities performed and presents the obtained results.
[ { "created": "Fri, 14 Feb 2014 12:02:31 GMT", "version": "v1" }, { "created": "Fri, 27 Jun 2014 13:39:44 GMT", "version": "v2" }, { "created": "Wed, 9 Jul 2014 22:18:32 GMT", "version": "v3" } ]
2015-06-18
[ [ "Proserpio", "L.", "" ], [ "Basso", "S.", "" ], [ "Borsa", "F.", "" ], [ "Citterio", "O.", "" ], [ "Civitani", "M.", "" ], [ "Ghigo", "M.", "" ], [ "Pareschi", "G.", "" ], [ "Salmaso", "B.", "" ], [ "Sironi", "G.", "" ], [ "Spiga", "D.", "" ], [ "Tagliaferri", "G.", "" ], [ "D'Este", "A.", "" ], [ "Dall'Igna", "R.", "" ], [ "Silvestri", "M.", "" ], [ "Parodi", "G.", "" ], [ "Martelli", "F.", "" ], [ "Bavdaz", "M.", "" ], [ "Wille", "E.", "" ] ]
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1402.3447
Ioannis Caragiannis
Ioannis Caragiannis and Alexandros A. Voudouris
Welfare guarantees for proportional allocations
15 pages
null
null
null
cs.GT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
According to the proportional allocation mechanism from the network optimization literature, users compete for a divisible resource -- such as bandwidth -- by submitting bids. The mechanism allocates to each user a fraction of the resource that is proportional to her bid and collects an amount equal to her bid as payment. Since users act as utility-maximizers, this naturally defines a proportional allocation game. Recently, Syrgkanis and Tardos (STOC 2013) quantified the inefficiency of equilibria in this game with respect to the social welfare and presented a lower bound of 26.8% on the price of anarchy over coarse-correlated and Bayes-Nash equilibria in the full and incomplete information settings, respectively. In this paper, we improve this bound to 50% over both equilibrium concepts. Our analysis is simpler and, furthermore, we argue that it cannot be improved by arguments that do not take the equilibrium structure into account. We also extend it to settings with budget constraints where we show the first constant bound (between 36% and 50%) on the price of anarchy of the corresponding game with respect to an effective welfare benchmark that takes budgets into account.
[ { "created": "Fri, 14 Feb 2014 12:21:14 GMT", "version": "v1" } ]
2014-02-17
[ [ "Caragiannis", "Ioannis", "" ], [ "Voudouris", "Alexandros A.", "" ] ]
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1402.3448
Francesca Fiorenzi
Francesca Fiorenzi
Periodic configurations of subshifts on groups
null
Internat. J. Algebra Comput. 19 (2009) no. 3, 315-335
10.1142/S0218196709005123
null
cs.FL math.DS math.GR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the density of periodic configurations for shift spaces defined on (the Cayley graph of) a finitely generated group. We prove that in the case of a full shift on a residually finite group and in that of a group shift space on an abelian group, the periodic configurations are dense. In the one-dimensional case we prove the density for irreducible sofic shifts. In connection with this we study the surjunctivity of cellular automata and local selfmappings. Some related decision problems for shift spaces of finite type are also investigated.
[ { "created": "Fri, 14 Feb 2014 12:26:10 GMT", "version": "v1" } ]
2014-02-27
[ [ "Fiorenzi", "Francesca", "" ] ]
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1402.3449
Masaki Nakanishi
Masaki Nakanishi
Quantum Pushdown Automata with a Garbage Tape
v3 Proofs in Section 4 were revised. Introduction was revised. Theorem 1 was removed since Theorem 2, which is Theorem 1 in the new version, is the generalization of it. Several other minor revisions were made. v4 The well-formedness conditions were added. Several other minor revisions were made
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quant-ph cs.CC cs.FL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Several kinds of quantum pushdown automaton models have been proposed, and their computational power is investigated intensively. However, for some quantum pushdown automaton models, it is not known whether quantum models are at least as powerful as classical counterparts or not. This is due to the reversibility restriction. In this paper, we introduce a new quantum pushdown automaton model that has a garbage tape. This model can overcome the reversibility restriction by exploiting the garbage tape to store popped symbols. We show that the proposed model can simulate any quantum pushdown automaton with a classical stack as well as any probabilistic pushdown automaton. We also show that our model can solve a certain promise problem exactly while deterministic pushdown automata cannot. These results imply that our model is strictly more powerful than classical counterparts in the setting of exact, one-sided error and non-deterministic computation.
[ { "created": "Fri, 14 Feb 2014 12:31:15 GMT", "version": "v1" }, { "created": "Sun, 27 Apr 2014 09:32:16 GMT", "version": "v2" }, { "created": "Wed, 13 Aug 2014 08:29:39 GMT", "version": "v3" }, { "created": "Thu, 2 Oct 2014 06:42:29 GMT", "version": "v4" } ]
2014-10-03
[ [ "Nakanishi", "Masaki", "" ] ]
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1402.3450
Ioannis Caragiannis
Ioannis Caragiannis and Angelo Fanelli and Nick Gravin
Short sequences of improvement moves lead to approximate equilibria in constraint satisfaction games
12 pages
null
null
null
cs.GT cs.CC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present an algorithm that computes approximate pure Nash equilibria in a broad class of constraint satisfaction games that generalize the well-known cut and party affiliation games. Our results improve previous ones by Bhalgat et al.~(EC 10) in terms of the obtained approximation guarantee. More importantly, our algorithm identifies a polynomially-long sequence of improvement moves from any initial state to an approximate equilibrium in these games. The existence of such short sequences is an interesting structural property which, to the best of our knowledge, was not known before. Our techniques adapt and extend our previous work for congestion games (FOCS 11) but the current analysis is considerably simpler.
[ { "created": "Fri, 14 Feb 2014 12:31:36 GMT", "version": "v1" } ]
2014-02-17
[ [ "Caragiannis", "Ioannis", "" ], [ "Fanelli", "Angelo", "" ], [ "Gravin", "Nick", "" ] ]
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1402.3452
Markus Lohrey
Markus Lohrey and Manfred Schmidt-Schauss
Processing Succinct Matrices and Vectors
An extended abstract of this paper will appear in the Proceedings of CSR 2014
null
null
null
cs.DS cs.CC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the complexity of algorithmic problems for matrices that are represented by multi-terminal decision diagrams (MTDD). These are a variant of ordered decision diagrams, where the terminal nodes are labeled with arbitrary elements of a semiring (instead of 0 and 1). A simple example shows that the product of two MTDD-represented matrices cannot be represented by an MTDD of polynomial size. To overcome this deficiency, we extended MTDDs to MTDD_+ by allowing componentwise symbolic addition of variables (of the same dimension) in rules. It is shown that accessing an entry, equality checking, matrix multiplication, and other basic matrix operations can be solved in polynomial time for MTDD_+-represented matrices. On the other hand, testing whether the determinant of a MTDD-represented matrix vanishes PSPACE$-complete, and the same problem is NP-complete for MTDD_+-represented diagonal matrices. Computing a specific entry in a product of MTDD-represented matrices is #P-complete.
[ { "created": "Fri, 14 Feb 2014 12:44:47 GMT", "version": "v1" } ]
2014-02-17
[ [ "Lohrey", "Markus", "" ], [ "Schmidt-Schauss", "Manfred", "" ] ]
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1402.3459
Mikhail Kostylev
Eugene N. Ivanov and Mikhail Kostylev
Extremely high-resolution measurements of microwave magnetisation dynamics in magnetic thin films and nanostructures
null
null
null
null
cond-mat.mes-hall cond-mat.mtrl-sci physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this work we discuss the use of interferometric measurement technique to study microwave magnetization dynamics on ferromagnetic nanostructures. We demonstrate that in this way one can resolve features which are impossible to resolve with broadband ferromagnetic resonance and traveling spin wave spectroscopy otherwise.
[ { "created": "Fri, 14 Feb 2014 13:20:04 GMT", "version": "v1" } ]
2014-02-17
[ [ "Ivanov", "Eugene N.", "" ], [ "Kostylev", "Mikhail", "" ] ]
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1402.3468
Benjamin Hendrik Martin Ludwig
Hendrik Ludwig, Remo Ruffini, and She-Sheng Xue
Collective electronic pulsation around giant nuclei in the Thomas-Fermi model
null
Nuclear Physics, Section A (2015), pp. 1-15
10.1016/j.nuclphysa.2015.05.005
null
physics.plasm-ph astro-ph.HE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Based on the Thomas-Fermi solution for compressed electron gas around a giant nucleus, $Z\approx 10^6$, we study electric pulsations of electron number-density, pressure and electric fields, which could be caused by an external perturbations acting on the nucleus or the electrons themselves. We numerically obtain the eigen-frequencies and eigen-functions for stationary pulsation modes that fulfill the boundary-value problem established by electron-number and energy-momentum conservation, equation of state, laws of thermodynamics, and Maxwell's equations, as well as physical boundary conditions. We choose a proton number of $Z=10^6$ and assume the nucleons in $\beta$-equilibrium at nuclear density. Similar systems with non-spherical geometry are hypothesized to exist in the lower crust of neutron stars, commonly referred to as \textit{pasta equation of state}. The lowest modes turn out to be heavily influenced by the relativistic plasma frequency induced by the positive charge background in the nucleus. We discuss the possibility to apply our results to dynamic nuclei using the spectral method and mention mechanisms that could stimulate such dynamics in the astrophysical context.
[ { "created": "Fri, 14 Feb 2014 14:09:55 GMT", "version": "v1" }, { "created": "Wed, 17 Dec 2014 14:54:02 GMT", "version": "v2" }, { "created": "Thu, 18 Dec 2014 08:54:52 GMT", "version": "v3" }, { "created": "Sun, 1 Mar 2015 23:13:19 GMT", "version": "v4" }, { "created": "Sun, 14 Jun 2015 19:18:39 GMT", "version": "v5" } ]
2015-06-16
[ [ "Ludwig", "Hendrik", "" ], [ "Ruffini", "Remo", "" ], [ "Xue", "She-Sheng", "" ] ]
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1402.3470
Thomas Bosch
Thomas Bosch, Andias Wira-Alam and Brigitte Mathiak
Designing an Ontology for the Data Documentation Initiative
null
null
null
null
cs.IR cs.DL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
An ontology of the DDI 3 data model will be designed by following the ontology engineering methodology to be evolved based on state-of-the-art methodologies. Hence DDI 3 data and metadata can be represented in form of a standard web interchange format RDF and processed by highly available RDF tools. As a consequence the DDI community has the possibility to publish and link LOD data sets to become part of the LOD cloud.
[ { "created": "Fri, 14 Feb 2014 14:12:17 GMT", "version": "v1" } ]
2014-02-17
[ [ "Bosch", "Thomas", "" ], [ "Wira-Alam", "Andias", "" ], [ "Mathiak", "Brigitte", "" ] ]
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1402.3472
Marcin Pilipczuk
Ivan Bliznets and Fedor V. Fomin and Marcin Pilipczuk and Micha{\l} Pilipczuk
A subexponential parameterized algorithm for Proper Interval Completion
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cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In the Proper Interval Completion problem we are given a graph G and an integer k, and the task is to turn G using at most k edge additions into a proper interval graph, i.e., a graph admitting an intersection model of equal-length intervals on a line. The study of Proper Interval Completion from the viewpoint of parameterized complexity has been initiated by Kaplan, Shamir and Tarjan [FOCS 1994; SIAM J. Comput. 1999], who showed an algorithm for the problem working in $O(16^k (n + m))$ time. In this paper we present an algorithm with running time $k^{O(k^{2/3})} + O(nm(kn + m))$, which is the first subexponential parameterized algorithm for Proper Interval Completion.
[ { "created": "Thu, 13 Feb 2014 20:03:41 GMT", "version": "v1" } ]
2014-02-17
[ [ "Bliznets", "Ivan", "" ], [ "Fomin", "Fedor V.", "" ], [ "Pilipczuk", "Marcin", "" ], [ "Pilipczuk", "Michał", "" ] ]
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1402.3473
Marcin Pilipczuk
Ivan Bliznets and Fedor V. Fomin and Marcin Pilipczuk and Micha{\l} Pilipczuk
A subexponential parameterized algorithm for Interval Completion
v2: An overview of the proof has been added; v3: updated introduction
null
null
null
cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In the Interval Completion problem we are given a graph G and an integer k, and the task is to turn G using at most k edge additions into an interval graph, i.e., a graph admitting an intersection model of intervals on a line. Motivated by applications in sparse matrix multiplication and molecular biology, Kaplan, Shamir and Tarjan [FOCS 1994; SIAM J. Comput. 1999] asked for a fixed-parameter algorithm solving this problem. This question was answer affirmatively more than a decade later by Villanger at el. [STOC 2007; SIAM J. Comput. 2009], who presented an algorithm with running time $O(k^{2k}n^3m)$. We give the first subexponential parameterized algorithm solving Interval Completion in time $k^{O(\sqrt{k})} n^{O(1)}$. This adds Interval Completion to a very small list of parameterized graph modification problems solvable in subexponential time.
[ { "created": "Thu, 13 Feb 2014 20:06:50 GMT", "version": "v1" }, { "created": "Thu, 3 Apr 2014 10:03:59 GMT", "version": "v2" }, { "created": "Mon, 10 Nov 2014 12:03:25 GMT", "version": "v3" } ]
2014-11-11
[ [ "Bliznets", "Ivan", "" ], [ "Fomin", "Fedor V.", "" ], [ "Pilipczuk", "Marcin", "" ], [ "Pilipczuk", "Michał", "" ] ]
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1402.3476
Pierre B\'ejot
P. B\'ejot, G. Karras, F. Billard, E. Hertz, B. Lavorel, E. Cormier, and O. Faucher
Harmonic generation and filamentation: when secondary radiations have primary consequences
7 pages, 5 figures
null
10.1103/PhysRevLett.112.203902
null
physics.optics physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this Letter, it is experimentally and theoretically shown that weak odd harmonics generated during the propagation of an infrared ultrashort ultra-intense pulse unexpectedly modify the nonlinear properties of the medium and lead to a strong modification of the propagation dynamics. This result is in contrast with all current state-of-the-art propagation model predictions, in which secondary radiations, such as third harmonic, are expected to have a negligible action upon the fundamental pulse propagation. By analysing full three-dimensional ab initio quantum calculations describing the microscopic atomic optical response, we have identified a fundamental mechanism resulting from interferences between a direct ionization channel and a channel involving one single ultraviolet photon. This mechanism is responsible for wide refractive index modifications in relation with significant variation of the ionization rate. This work paves the way to the full physical understanding of the filamentation mechanism and could lead to unexplored phenomena, such as coherent control of the filamentation by harmonic seeding.
[ { "created": "Fri, 14 Feb 2014 14:24:21 GMT", "version": "v1" } ]
2015-06-18
[ [ "Béjot", "P.", "" ], [ "Karras", "G.", "" ], [ "Billard", "F.", "" ], [ "Hertz", "E.", "" ], [ "Lavorel", "B.", "" ], [ "Cormier", "E.", "" ], [ "Faucher", "O.", "" ] ]
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