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1401.8074
Kevin Leyton-Brown
Erik Zawadzki, Asher Lipson, Kevin Leyton-Brown
Empirically Evaluating Multiagent Learning Algorithms
null
null
null
null
cs.GT cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
There exist many algorithms for learning how to play repeated bimatrix games. Most of these algorithms are justified in terms of some sort of theoretical guarantee. On the other hand, little is known about the empirical performance of these algorithms. Most such claims in the literature are based on small experiments, which has hampered understanding as well as the development of new multiagent learning (MAL) algorithms. We have developed a new suite of tools for running multiagent experiments: the MultiAgent Learning Testbed (MALT). These tools are designed to facilitate larger and more comprehensive experiments by removing the need to build one-off experimental code. MALT also provides baseline implementations of many MAL algorithms, hopefully eliminating or reducing differences between algorithm implementations and increasing the reproducibility of results. Using this test suite, we ran an experiment unprecedented in size. We analyzed the results according to a variety of performance metrics including reward, maxmin distance, regret, and several notions of equilibrium convergence. We confirmed several pieces of conventional wisdom, but also discovered some surprising results. For example, we found that single-agent $Q$-learning outperformed many more complicated and more modern MAL algorithms.
[ { "created": "Fri, 31 Jan 2014 07:02:58 GMT", "version": "v1" } ]
2014-02-03
[ [ "Zawadzki", "Erik", "" ], [ "Lipson", "Asher", "" ], [ "Leyton-Brown", "Kevin", "" ] ]
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1401.8079
Rafayel Kamalian
A.S. Asratian, R.R. Kamalian
Interval colorings of edges of a multigraph
null
Applied Mathematics 5, Yerevan State University, 1987, pp. 25--34
null
null
cs.DM math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let $G=(V_1(G),V_2(G),E(G))$ be a bipartite multigraph, and $R\subseteq V_1(G)\cup V_2(G)$. A proper coloring of edges of $G$ with the colors $1,\ldots,t$ is called interval (respectively, continuous) on $R$, if each color is used for at least one edge and the edges incident with each vertex $x\in R$ are colored by $d(x)$ consecutive colors (respectively, by the colors $1,\ldots,d(x))$, where $d(x)$ is a degree of the vertex $x$. We denote by $w_1(G)$ and $W_1(G)$, respectively, the least and the greatest values of $t$, for which there exists an interval on $V_1(G)$ coloring of the multigraph $G$ with the colors $1,\ldots,t$. In the paper the following basic results are obtained. \textbf{Theorem 2.} For an arbitrary $k$, $w_1(G)\leq k\leq W_1(G)$, there is an interval on $V_1(G)$ coloring of the multigraph $G$ with the colors $1,\ldots,k$. \textbf{Theorem 3.} The problem of recognition of the existence of a continuous on $V_1(G)$ coloring of the multigraph $G$ is $NP$-complete. \textbf{Theorem 4.} If for any edge $(x,y)\in E(G)$, where $x\in V_1(G)$, the inequality $d(x)\geq d(y)$ holds then there is a continuous on $V_1(G)$ coloring of the multigraph $G$. \textbf{Theorem 1.} If $G$ has no multiple edges and triangles, and there is an interval on $V(G)$ coloring of the graph $G$ with the colors $1,\ldots,k$, then $k\leq|V(G)|-1$.
[ { "created": "Fri, 31 Jan 2014 07:54:40 GMT", "version": "v1" } ]
2014-02-03
[ [ "Asratian", "A. S.", "" ], [ "Kamalian", "R. R.", "" ] ]
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1401.8081
Bastian Schaefer
Bastian Schaefer, Stephan Mohr, Maximilian Amsler, Stefan Goedecker
Minima Hopping Guided Path Search: An Efficient Method for Finding Complex Chemical Reaction Pathways
15 pages, 8 figures
J. Chem. Phys. 140, 214102 (2014)
10.1063/1.4878944
null
cond-mat.mtrl-sci physics.chem-ph physics.comp-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Minima Hopping global optimization method uses physically realizable molecular dynamics moves in combination with an energy feedback that guarantees the escape from any potential energy funnel. For the purpose of finding reactions pathways, we argue that Minima Hopping is particularly suitable as a guide through the potential energy landscape and as a generator for pairs of minima that can be used as input structures for methods capable of finding transition states between two minima. For Lennard-Jones benchmark systems we compared this Minima Hopping guided path search method to a known approach for the exploration of potential energy landscapes that is based on deterministic mode-following. Although we used a stabilized mode-following technique that reliably allows to follow distinct directions when escaping from a local minimum, we observed that Minima Hopping guided path search is far superior in finding lowest-barrier reaction pathways. We therefore suggest that Minima Hopping guided path search can be used as a simple and efficient way to identify energetically low-lying chemical reaction pathways. Finally we applied the Minima Hopping guided path search approach to 75-atom and 102-atom Lennard Jones systems. For the 75-atom system we found pathways whose highest energies are significantly lower than the highest energy along the previously published lowest-barrier pathway. Furthermore, many of these pathways contain a smaller number of intermediate transition states than the previously publish lowest-barrier pathway. In case of the 102-atom system Minima Hopping guided path search found a previously unknown and energetically low-lying funnel.
[ { "created": "Fri, 31 Jan 2014 08:39:04 GMT", "version": "v1" }, { "created": "Wed, 21 May 2014 11:14:26 GMT", "version": "v2" } ]
2014-06-05
[ [ "Schaefer", "Bastian", "" ], [ "Mohr", "Stephan", "" ], [ "Amsler", "Maximilian", "" ], [ "Goedecker", "Stefan", "" ] ]
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1401.8084
Alexandre Marques
Alexandre Noll Marques, Jean-Christophe Nave, Rodolfo Ruben Rosales
High order solution of Poisson problems with piecewise constant coefficients and interface jumps
null
null
10.1016/j.jcp.2017.01.029
null
physics.comp-ph math.NA physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a fast and accurate algorithm to solve Poisson problems in complex geometries, using regular Cartesian grids. We consider a variety of configurations, including Poisson problems with interfaces across which the solution is discontinuous (of the type arising in multi-fluid flows). The algorithm is based on a combination of the Correction Function Method (CFM) and Boundary Integral Methods (BIM). Interface and boundary conditions can be treated in a fast and accurate manner using boundary integral equations, and the associated BIM. Unfortunately, BIM can be costly when the solution is needed everywhere in a grid, e.g. fluid flow problems. We use the CFM to circumvent this issue. The solution from the BIM is used to rewrite the problem as a series of Poisson problems in rectangular domains - which requires the BIM solution at interfaces/boundaries only. These Poisson problems involve discontinuities at interfaces, of the type that the CFM can handle. Hence we use the CFM to solve them (to high order of accuracy) with finite differences and a Fast Fourier Transform based fast Poisson solver. We present 2-D examples of the algorithm applied to Poisson problems involving complex geometries, including cases in which the solution is discontinuous. We show that the algorithm produces solutions that converge with either 3rd or 4th order of accuracy, depending on the type of boundary condition and solution discontinuity.
[ { "created": "Fri, 31 Jan 2014 08:46:36 GMT", "version": "v1" }, { "created": "Tue, 4 Feb 2014 02:03:35 GMT", "version": "v2" }, { "created": "Tue, 31 May 2016 19:41:11 GMT", "version": "v3" }, { "created": "Fri, 16 Dec 2016 04:29:49 GMT", "version": "v4" } ]
2017-11-07
[ [ "Marques", "Alexandre Noll", "" ], [ "Nave", "Jean-Christophe", "" ], [ "Rosales", "Rodolfo Ruben", "" ] ]
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1401.8090
Markus Stinner
Markus Stinner Pablo M. Olmos
Analyzing Finite-length Protograph-based Spatially Coupled LDPC Codes
5 pages, 6 figures, submitted to ISIT 2014
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The peeling decoding for spatially coupled low-density parity-check (SC-LDPC) codes is analyzed for a binary erasure channel. An analytical calculation of the mean evolution of degree-one check nodes of protograph-based SC-LDPC codes is given and an estimate for the covariance evolution of degree-one check nodes is proposed in the stable decoding phase where the decoding wave propagates along the chain of coupled codes. Both results are verified numerically. Protograph-based SC-LDPC codes turn out to have a more robust behavior than unstructured random SC-LDPC codes. Using the analytically calculated parameters, the finite- length scaling laws for these constructions are given and verified by numerical simulations.
[ { "created": "Fri, 31 Jan 2014 09:19:51 GMT", "version": "v1" } ]
2014-02-03
[ [ "Olmos", "Markus Stinner Pablo M.", "" ] ]
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1401.8092
Radu Horaud P
Miles Hansard, Georgios Evangelidis, Quentin Pelorson, and Radu Horaud
Cross-calibration of Time-of-flight and Colour Cameras
18 pages, 12 figures, 3 tables
Computer Vision and Image Understanding, 134, pp.105-115, 2015
10.1016/j.cviu.2014.09.001
null
cs.CV cs.RO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Time-of-flight cameras provide depth information, which is complementary to the photometric appearance of the scene in ordinary images. It is desirable to merge the depth and colour information, in order to obtain a coherent scene representation. However, the individual cameras will have different viewpoints, resolutions and fields of view, which means that they must be mutually calibrated. This paper presents a geometric framework for this multi-view and multi-modal calibration problem. It is shown that three-dimensional projective transformations can be used to align depth and parallax-based representations of the scene, with or without Euclidean reconstruction. A new evaluation procedure is also developed; this allows the reprojection error to be decomposed into calibration and sensor-dependent components. The complete approach is demonstrated on a network of three time-of-flight and six colour cameras. The applications of such a system, to a range of automatic scene-interpretation problems, are discussed.
[ { "created": "Fri, 31 Jan 2014 09:23:26 GMT", "version": "v1" }, { "created": "Mon, 30 Jun 2014 12:07:18 GMT", "version": "v2" } ]
2020-12-18
[ [ "Hansard", "Miles", "" ], [ "Evangelidis", "Georgios", "" ], [ "Pelorson", "Quentin", "" ], [ "Horaud", "Radu", "" ] ]
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1401.8096
Caterina De Bacco
Caterina De Bacco, Silvio Franz, David Saad and Chi Ho Yeung
Shortest node-disjoint paths on random graphs
22 pages, 14 figures
J. Stat. Mech. (2014) P07009
10.1088/1742-5468/2014/07/P07009
null
cond-mat.dis-nn cs.DS math.OC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A localized method to distribute paths on random graphs is devised, aimed at finding the shortest paths between given source/destination pairs while avoiding path overlaps at nodes. We propose a method based on message-passing techniques to process global information and distribute paths optimally. Statistical properties such as scaling with system size and number of paths, average path-length and the transition to the frustrated regime are analysed. The performance of the suggested algorithm is evaluated through a comparison against a greedy algorithm.
[ { "created": "Fri, 31 Jan 2014 09:34:29 GMT", "version": "v1" }, { "created": "Sun, 18 May 2014 09:30:11 GMT", "version": "v2" } ]
2014-10-17
[ [ "De Bacco", "Caterina", "" ], [ "Franz", "Silvio", "" ], [ "Saad", "David", "" ], [ "Yeung", "Chi Ho", "" ] ]
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1401.8099
Daniel Ploss
Daniel Ploss, Arian Kriesch, Hannes Pfeifer, Peter Banzer, and Ulf Peschel
Generation and subwavelength focusing of longitudinal magnetic fields in a metallized fiber tip
11 pages, 6 figures
Optics Express, 22 (11), pp. 13744-13754, 2014
10.1364/OE.22.013744
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We demonstrate experimentally and numerically that in fiber tips as they are used in NSOMs azimuthally polarized electrical fields (|E$_{\text{azi}}$|$^2$/|E$_{\text{tot}}$|$^2$ $\approx$ 55% $\pm $ 5% for 1.4\mu m tip aperture diameter and \lambda$_0$ = 1550nm), respectively subwavelength confined (FWHM $\approx$ 450nm $\approx$ \lambda$_0$/3.5) magnetic fields, are generated for a certain tip aperture diameter (d = 1.4\mu m). We attribute the generation of this field distribution in metal-coated fiber tips to symmetry breaking in the bend and subsequent plasmonic mode filtering in the truncated conical taper.
[ { "created": "Fri, 31 Jan 2014 09:40:57 GMT", "version": "v1" }, { "created": "Sat, 31 May 2014 22:22:54 GMT", "version": "v2" } ]
2014-06-03
[ [ "Ploss", "Daniel", "" ], [ "Kriesch", "Arian", "" ], [ "Pfeifer", "Hannes", "" ], [ "Banzer", "Peter", "" ], [ "Peschel", "Ulf", "" ] ]
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1401.8107
Shigehito Miki
Shigehito Miki, Taro Yamashita, Zhen Wang, and Hirotaka Terai
64-pixel NbTiN superconducting nanowire single-photon detector array for spatially resolved photon detection
11 pages, 5 figures
null
10.1364/OE.22.007811
null
physics.ins-det physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present the characterization of two-dimensionally arranged 64-pixel NbTiN superconducting nanowire single-photon detector array for spatially resolved photon detection. NbTiN films deposited on thermally oxidized Si substrates enabled the high-yield production of high-quality SSPD pixels, and all 64 SSPD pixels showed uniform superconducting characteristics. Furthermore, all of the pixels showed single-photon sensitivity, and 60 of the 64 pixels showed a pulse generation probability higher than 90% after photon absorption. As a result of light irradiation from the single-mode optical fiber at different distances between the fiber tip and the active area, the variations of system detection efficiency in each pixel showed reasonable Gaussian distribution to represent the spatial distributions of photon flux intensity.
[ { "created": "Fri, 31 Jan 2014 09:55:54 GMT", "version": "v1" } ]
2015-06-18
[ [ "Miki", "Shigehito", "" ], [ "Yamashita", "Taro", "" ], [ "Wang", "Zhen", "" ], [ "Terai", "Hirotaka", "" ] ]
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1401.8112
Justus Kromer
Justus A. Kromer and Benjamin Lindner and Lutz Schimansky-Geier
Event-triggered feedback in noise-driven phase oscillators
15 pages, 11 figures, submitted to Physical Review E
Phys. Rev. E, 89 (2014) 032138
10.1103/PhysRevE.89.032138
null
physics.data-an cond-mat.stat-mech nlin.CD
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Using a stochastic nonlinear phase oscillator model, we study the effect of event-triggered feedback on the statistics of interevent intervals. Events are associated with the entering of a new cycle. The feedback is modeled by an instantaneous increase (positive feedback) or decrease (negative feedback) of the oscillators frequency, whenever an event occurs followed by an exponential decay on a slow timescale. In contrast to previous works, we also consider positive feedback that leads to various novel effects. For instance, besides the known excitable and oscillatory regime, that are separated by a saddle-node on invariant circle bifurcation, positive feedback can lead to bistable dynamics and a change of the system's excitability. The feedback has also a strong effect on noise-induced phenomena like coherence resonance or anti-coherence resonance. Both positive and negative feedback can lead to more regular output for particular noise strengths. Finally, we investigate serial correlation in the sequence of interevent intervals that occur due to the additional slow dynamics. We derive approximations for the serial correlation coefficient and show that positive feedback results in extended positive interval correlations whereas negative feedback yields short-ranging negative correlations. Investigating the interplay of feedback and the nonlinear phase dynamics close to the bifurcation, we find that correlations are most pronounced for an optimal feedback strengths.
[ { "created": "Fri, 31 Jan 2014 10:09:03 GMT", "version": "v1" } ]
2015-06-18
[ [ "Kromer", "Justus A.", "" ], [ "Lindner", "Benjamin", "" ], [ "Schimansky-Geier", "Lutz", "" ] ]
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1401.8120
Rosy Madaan
Suprita Das, Rajesh Duvvuru, Sonal Raj
Novel Integrated Approach of Software Development and Design Pattern with X-CM
8 Pages. IJCEA,2013
null
null
null
cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Expert evaluation in software life cycle is playing a vital role. In this paper, we have discussed about the formal framework for selecting the best model with some enhanced features. In our work we have introduced a novel algorithm X Chain Model X-CM. Here XCM overcomes the limitation of Vmodel. In XCM, we have concentrated on hierarchy of multiple independent sub-projects in project development phase. XCM merges through the subprojects binding them at their Integration Testing Phases. Hence combining binary modules at each stage into a new module through chains of X till the final level in the hierarchy is implemented. X-CM results in reducing the time and effort for software developer. In addition to this, X-CM also rules out the dependency errors between the modules at each stage of combination. Here we have tested our proposed X-CM with Unit Testing and Integrating test. Finally, we proved that X-CM Model works better than Spiral, Prototype and V-Model.
[ { "created": "Fri, 31 Jan 2014 10:38:42 GMT", "version": "v1" } ]
2014-02-03
[ [ "Das", "Suprita", "" ], [ "Duvvuru", "Rajesh", "" ], [ "Raj", "Sonal", "" ] ]
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1401.8125
Jingyu Tang PhD
Jun Cao, Miao He, Zhi-Long Hou, Han-Tao Jing, Yu-Feng Li, Zhi-Hui Li, Ying-Peng Song, Jing-Yu Tang, Yi-Fang Wang, Qian-Fan Wu, Ye Yuan, Yang-Heng Zheng
MOMENT: a muon-decay medium-baseline neutrino beam facility
18 pages, 16 figures, 3 tables
Phys. Rev. ST Accel. Beams 17, 090101 (2014)
10.1103/PhysRevSTAB.17.090101
null
physics.acc-ph hep-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Neutrino beam with about 300 MeV in energy, high-flux and medium baseline is considered a rational choice for measuring CP violation before the more powerful Neutrino Factory will be built. Following this concept, a unique neutrino beam facility based on muon-decayed neutrinos is proposed. The facility adopts a continuous-wave proton linac of 1.5 GeV and 10 mA as the proton driver, which can deliver an extremely high beam power of 15 MW. Instead of pion-decayed neutrinos, unprecedentedly intense muon-decayed neutrinos are used for better background discrimination. The schematic design for the facility is presented here, including the proton driver, the assembly of a mercury-jet target and capture superconducting solenoids, a pion/muon beam transport line, a long muon decay channel of about 600 m and the detector concept. The physics prospects and the technical challenges are also discussed.
[ { "created": "Fri, 31 Jan 2014 10:56:34 GMT", "version": "v1" }, { "created": "Fri, 28 Feb 2014 09:34:10 GMT", "version": "v2" } ]
2014-10-01
[ [ "Cao", "Jun", "" ], [ "He", "Miao", "" ], [ "Hou", "Zhi-Long", "" ], [ "Jing", "Han-Tao", "" ], [ "Li", "Yu-Feng", "" ], [ "Li", "Zhi-Hui", "" ], [ "Song", "Ying-Peng", "" ], [ "Tang", "Jing-Yu", "" ], [ "Wang", "Yi-Fang", "" ], [ "Wu", "Qian-Fan", "" ], [ "Yuan", "Ye", "" ], [ "Zheng", "Yang-Heng", "" ] ]
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1401.8126
Chunhua Shen
Mehrtash Harandi, Richard Hartley, Chunhua Shen, Brian Lovell, Conrad Sanderson
Extrinsic Methods for Coding and Dictionary Learning on Grassmann Manifolds
Appearing in International Journal of Computer Vision
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null
null
cs.LG cs.CV stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Sparsity-based representations have recently led to notable results in various visual recognition tasks. In a separate line of research, Riemannian manifolds have been shown useful for dealing with features and models that do not lie in Euclidean spaces. With the aim of building a bridge between the two realms, we address the problem of sparse coding and dictionary learning over the space of linear subspaces, which form Riemannian structures known as Grassmann manifolds. To this end, we propose to embed Grassmann manifolds into the space of symmetric matrices by an isometric mapping. This in turn enables us to extend two sparse coding schemes to Grassmann manifolds. Furthermore, we propose closed-form solutions for learning a Grassmann dictionary, atom by atom. Lastly, to handle non-linearity in data, we extend the proposed Grassmann sparse coding and dictionary learning algorithms through embedding into Hilbert spaces. Experiments on several classification tasks (gender recognition, gesture classification, scene analysis, face recognition, action recognition and dynamic texture classification) show that the proposed approaches achieve considerable improvements in discrimination accuracy, in comparison to state-of-the-art methods such as kernelized Affine Hull Method and graph-embedding Grassmann discriminant analysis.
[ { "created": "Fri, 31 Jan 2014 10:59:38 GMT", "version": "v1" }, { "created": "Wed, 20 May 2015 00:12:44 GMT", "version": "v2" } ]
2015-05-21
[ [ "Harandi", "Mehrtash", "" ], [ "Hartley", "Richard", "" ], [ "Shen", "Chunhua", "" ], [ "Lovell", "Brian", "" ], [ "Sanderson", "Conrad", "" ] ]
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1401.8131
Ankit Mundra
Bhagvan Krishna Gupta, Ankit Mundra, Nitin Rakesh
Failure Detection and Recovery in Hierarchical Network Using FTN Approach
8 pages, 7 figure. International Journal of Computer Science Issues, 2013
null
null
null
cs.DC cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In current scenario several commercial and social organizations are using computer networks for their business and management purposes. In order to meet the business requirements networks are also grow. The growth of network also promotes the handling capability of large networks because it counter raises the possibilities of various faults in the network. A fault in network degrades its performance by affecting parameters like throughput, delay, latency, reliability etc. In hierarchical network models any possibility of fault may collapse entire network. If a fault occurrence disables a device in hierarchical network then it may distresses all the devices underneath. Thus it affects entire networks performance. In this paper we propose Fault Tolerable hierarchical Network (FTN) approach as a solution to the problems of hierarchical networks. The proposed approach firstly detects possibilities of fault in the network and accordingly provides specific recovery mechanism. We have evaluated the performance of FTN approach in terms of delay and throughput of network.
[ { "created": "Fri, 31 Jan 2014 11:06:41 GMT", "version": "v1" } ]
2014-02-03
[ [ "Gupta", "Bhagvan Krishna", "" ], [ "Mundra", "Ankit", "" ], [ "Rakesh", "Nitin", "" ] ]
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1401.8132
Giuseppe Vizzari
Stefania Bandini, Luca Crociani, Giuseppe Vizzari
Heterogeneous Speed Profiles in Discrete Models for Pedestrian Simulation
Poster at the 93rd Transportation Research Board annual meeting, Washington, January 2014 - Committee number AHB45 - TRB Committee on Traffic Flow Theory and Characteristics
null
null
null
cs.MA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Discrete pedestrian simulation models are viable alternatives to particle based approaches based on a continuous spatial representation. The effects of discretisation, however, also imply some difficulties in modelling certain phenomena that can be observed in reality. This paper focuses on the possibility to manage heterogeneity in the walking speed of the simulated population of pedestrians by modifying an existing multi-agent model extending the floor field approach. Whereas some discrete models allow pedestrians (or cars, when applied to traffic modelling) to move more than a single cell per time step, the present work proposes a maximum speed of one cell per step, but we model lower speeds by having pedestrians yielding their movement in some turns. Different classes of pedestrians are associated to different desired walking speeds and we define a stochastic mechanism ensuring that they maintain an average speed close to this threshold. In the paper we formally describe the model and we show the results of its application in benchmark scenarios. Finally, we also show how this approach can also support the definition of slopes and stairs as elements reducing the walking speed of pedestrians climbing them in a simulated scenario.
[ { "created": "Fri, 31 Jan 2014 11:07:25 GMT", "version": "v1" } ]
2014-02-03
[ [ "Bandini", "Stefania", "" ], [ "Crociani", "Luca", "" ], [ "Vizzari", "Giuseppe", "" ] ]
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1401.8135
Sascha Kurz
Sascha Kurz
Competitive learning of monotone Boolean functions
5 pages, 2 figures, presented at APMOD 2012
Suhl, Leena; Mitra, Gautam et al. (ed.): Applied Mathematical Optimization and Modelling, APMOD 2012, DS&OR Lab, Vol. 8, Pages 416-421
null
null
cs.DS cs.CC math.OC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We apply competitive analysis onto the problem of minimizing the number of queries to an oracle to completely reconstruct a given monotone Boolean function. Besides lower and upper bounds on the competitivity we determine optimal deterministic online algorithms for the smallest problem instances.
[ { "created": "Fri, 31 Jan 2014 11:23:52 GMT", "version": "v1" } ]
2014-02-03
[ [ "Kurz", "Sascha", "" ] ]
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1401.8136
Ivan Arakistain
Ivan Arakistain, Jose Miguel Abascal, Oriol Munne
ICT technologies for the refurbishment of wooden structure buildings
null
null
null
null
cs.OH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Nowadays, one would think that after years of massive concrete and steel construction in Spain, there are not many wood structure buildings left to be refurbished except for some palaces or cathedrals. However, if we go for a walk and have a look at the old part of any city, we will realize that still most of the buildings have a wood structure. In spite of the fact that the majority of urban regulations forbid their demolition, other bad practices such as casting and overloading the wood structure are very common. Considering that we want to reach a standard of sustainable construction, the economical and environmental costs, which are implied by the deficient refurbishment makes it well worth a previous study of the structure, which in most cases represents less than a 1% of the total budget. The main goal of this paper is to present most relevant parts of the whole process of diagnosis of a wood structure building by means of Non-Destructive Testing Techniques. Among the ones to be considered, we could mention the analysis of the building and its surroundings, on-site inspection of the building, structural diagnosis, definition of the corrective actions to be taken, definition of treatments, quality control and a maintenance plan. For the on-site inspection of the building, in the paper we will highlight the use of Non-Destructive methods such as resistograph drilling, X-ray imaging, ultrasound-based testing or moisture measurement. We will provide practical examples of all this. The aim of this paper is to give the audience an overall idea on how a pre-assessment work can enhance the refurbishment of a wood structure building while reducing costs and environmental impact.
[ { "created": "Fri, 31 Jan 2014 11:27:10 GMT", "version": "v1" } ]
2014-02-03
[ [ "Arakistain", "Ivan", "" ], [ "Abascal", "Jose Miguel", "" ], [ "Munne", "Oriol", "" ] ]
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1401.8140
Gabriel Plunk
G. G. Plunk and A. Ba\~n\'on Navarro and F. Jenko
Understanding nonlinear saturation in zonal-flow-dominated ion temperature gradient turbulence
Final journal version. Some clarifications and a new Fig. 4
Plasma Phys. Control. Fusion 57 045005 (2015)
10.1088/0741-3335/57/4/045005
null
physics.plasm-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose a quantitative model of ion temperature gradient driven turbulence in toroidal magnetized plasmas. In this model, the turbulence is regulated by zonal flows, i.e. mode saturation occurs by a zonal-flow-mediated energy cascade ("shearing"), and zonal flow amplitude is controlled by nonlinear decay. Our model is tested in detail against numerical simulations to confirm that both its assumptions and predictions are satisfied. Key results include (1) a sensitivity of the nonlinear zonal flow response to the energy content of the linear instability, (2) a persistence of zonal-flow-regulated saturation at high temperature gradients, (3) a physical explanation of the nonlinear saturation process in terms of secondary and tertiary instabilities, and (4) dependence of heat flux in terms of dimensionless parameters.
[ { "created": "Fri, 31 Jan 2014 11:48:39 GMT", "version": "v1" }, { "created": "Wed, 20 Aug 2014 07:14:59 GMT", "version": "v2" }, { "created": "Fri, 6 Mar 2015 12:34:17 GMT", "version": "v3" } ]
2015-03-09
[ [ "Plunk", "G. G.", "" ], [ "Navarro", "A. Bañón", "" ], [ "Jenko", "F.", "" ] ]
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1401.8144
David Rosales
David Rosales
Cooperative Product Games
null
null
null
null
cs.GT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
I introduce cooperative product games (CPGs), a cooperative game where every player has a weight, and the value of a coalition is the product of the weights of the players in the coalition. I only look at games where the weights are at least $2$. I show that no player in such a game can be a dummy. I show that the game is convex, and therefore always has a non-empty core. I provide a simple method for finding a payoff vector in the core.
[ { "created": "Fri, 31 Jan 2014 11:54:49 GMT", "version": "v1" } ]
2014-02-03
[ [ "Rosales", "David", "" ] ]
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1401.8146
Pascal Lederer
Pascal Lederer
Gauge Symmetry, Spontaneous Breaking of Gauge Symmetry: Philosophical Approach
29, no figures. The present version includes a section on scientific realism and materialism, mostly based on Hacking's views in "Representing and Intervening". It has a new section on emergence with a discussion of papers by Laughlin and Pines, Batterman, Howard, and Healey. A discussion of Pippard equation is also included
null
null
null
physics.hist-ph cond-mat.other
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper deals with the Berry phase, and the ontology of the electromagnetic vector potential. When the state of the system is gauge symmetric, the vector potential may be interpreted as a convenient tool of a mathematical formulation, with no ontological meaning. I argue that this interpretation is in difficulty because the vector potential depends linearly on the supercurrent in the superfluid state, which is a spontaneously broken gauge symmetry state, where particle number is not conserved. I suggest that when gauge symmetry is spontaneously broken, the vector potential becomes an emergent material object of nature. The revised version includes sections on scientific realism, and emergence, and new references on Noether's theorem, among others.
[ { "created": "Fri, 31 Jan 2014 11:59:31 GMT", "version": "v1" }, { "created": "Fri, 7 Nov 2014 22:14:11 GMT", "version": "v2" } ]
2014-11-11
[ [ "Lederer", "Pascal", "" ] ]
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1401.8147
Guillermo Federico Quinteiro
G. F. Quinteiro, D. E. Reiter, and T. Kuhn
Formulation of the twisted-light--matter interaction at the phase singularity: the twisted-light gauge
null
null
10.1103/PhysRevA.91.033808
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Twisted light is light carrying orbital angular momentum. The profile of such a beam is a ring-like structure with a node at the beam axis, where a phase singularity exits. Due to the strong spatial inhomogeneity the mathematical description of twisted-light--matter interaction is non-trivial, in particular close to the phase singularity, where the commonly used dipole-moment approximation cannot be applied. In this paper we show that, if the polarization and the orbital angular momentum of the twisted-light beam have the same sign, a Hamiltonian similar to the dipole-moment approximation can be derived. However, if the signs of polarization and orbital angular momentum differ, in general the magnetic parts of the light beam become of significant importance and an interaction Hamiltonian which only accounts for electric fields, as in the dipole-moment approximation, is inappropriate. We discuss the consequences of these findings for twisted-light excitation of a semiconductor nanostructures, e.g., a quantum dot, placed at the phase singularity.
[ { "created": "Fri, 31 Jan 2014 12:06:40 GMT", "version": "v1" }, { "created": "Fri, 20 Jun 2014 14:54:03 GMT", "version": "v2" }, { "created": "Fri, 12 Dec 2014 21:42:30 GMT", "version": "v3" } ]
2015-06-18
[ [ "Quinteiro", "G. F.", "" ], [ "Reiter", "D. E.", "" ], [ "Kuhn", "T.", "" ] ]
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1401.8151
Sascha Kurz
Andreas Darmann, Edith Elkind, Sascha Kurz, J\'er\^ome Lang, Joachim Schauer, and Gerhard Woeginger
Group Activity Selection Problem
13 pages, presented at WINE-2012 and COMSOC-2012
Lecture Notes in Computer Science Vol. 7695 (2012), Pages 157-170
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null
cs.GT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider a setting where one has to organize one or several group activities for a set of agents. Each agent will participate in at most one activity, and her preferences over activities depend on the number of participants in the activity. The goal is to assign agents to activities based on their preferences. We put forward a general model for this setting, which is a natural generalization of anonymous hedonic games. We then focus on a special case of our model, where agents' preferences are binary, i.e., each agent classifies all pairs of the form "(activity, group size)" into ones that are acceptable and ones that are not. We formulate several solution concepts for this scenario, and study them from the computational point of view, providing hardness results for the general case as well as efficient algorithms for settings where agents' preferences satisfy certain natural constraints.
[ { "created": "Fri, 31 Jan 2014 12:27:39 GMT", "version": "v1" } ]
2014-02-03
[ [ "Darmann", "Andreas", "" ], [ "Elkind", "Edith", "" ], [ "Kurz", "Sascha", "" ], [ "Lang", "Jérôme", "" ], [ "Schauer", "Joachim", "" ], [ "Woeginger", "Gerhard", "" ] ]
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1401.8152
Dibakar Saha
Dibakar Saha, Nabanita Das
Distributed Area Coverage by Connected Set Cover Partitioning in Wireless Sensor Networks
null
null
null
null
cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Assuming a random uniform distribution of n sensor nodes over a virtual grid, this paper addresses the problem of finding the maximum number of connected set covers each ensuring 100% coverage of the query region. The connected sets remain active one after another in a round robin fashion such that if there are P such set covers, it can enhance the network lifetime P-fold. From graph-theoretic point of view, a centralized O(n3) heuristic is proposed here to maximize P. Next, for large self-organized sensor networks, a distributed algorithm is developed. The proposed algorithm is to be executed just once, during the initialization of the network. In case of failure, a distributed recovery algorithm is executed to rearrange the partitions. Simulation studies show that the performance of the proposed distributed algorithm is comparable with that of the centralized algorithm in terms of number of partitions. Also, comparison with earlier works shows significant improvement in terms of number of partitions, message complexity and network lifetime.
[ { "created": "Fri, 31 Jan 2014 12:38:35 GMT", "version": "v1" }, { "created": "Thu, 13 Feb 2014 09:48:04 GMT", "version": "v2" } ]
2014-02-14
[ [ "Saha", "Dibakar", "" ], [ "Das", "Nabanita", "" ] ]
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1401.8155
Roberto Salerno Dr.
Florian Beaudette (the CMS Collaboration)
The CMS Particle Flow Algorithm
10 pages, 12 figures, proceedings for CHEF2013, Paris, France, April 2013
Proceedings of the CHEF2013 Conference - Eds. J.C. Brient, R. Salerno, and Y. Sirois - p295 (2013), ISBN 978-2-7302-1624-1
null
null
hep-ex physics.ins-det
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A particle flow event-reconstruction algorithm has been successfully deployed in the CMS experiment and is nowadays used by most of the analyses. It aims at identifying and reconstructing individually each particle arising from the LHC proton-proton collision, by combining the information from all the subdetectors. The resulting particle-flow event reconstruction leads to an improved performance for the reconstruction of jets and MET, and for the identification of electrons, muons, and taus. The algorithm and its performance will be described. The commissioning phase, during which it was demonstrated that the algorithm was performing as expected from the simulation up to a high level of precision, will be presented. Finally, a selection of recent improvements in the CMS analyses obtained thanks to the particle-flow algorithm will be discussed.
[ { "created": "Fri, 31 Jan 2014 12:54:56 GMT", "version": "v1" } ]
2014-02-03
[ [ "Beaudette", "Florian", "", "the CMS Collaboration" ] ]
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1401.8160
Stephan Schlamminger
Stephan Schlamminger, Darine Haddad, Frank Seifert, Leon S Chao, David B Newell, Ruimin Liu, Richard L Steiner, Jon R Pratt
Determination of the Planck constant using a watt balance with a superconducting magnet system at the National Institute of Standards and Technology
22 pages, 8 figures, published in metrologia
Metrologia 51, S15 (2014)
10.1088/0026-1394/51/2/S15
null
physics.class-ph physics.ins-det
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
For the past two years, measurements have been performed with a watt balance at the National Institute of Standards and Technology (NIST) to determine the Planck constant. A detailed analysis of these measurements and their uncertainties has led to the value $h=6.626\,069\,79(30)\times 10^{-34}\,$J$\,$s. The relative standard uncertainty is $ 45\times 10^{-9}$. This result is $141\times 10^{-9}$ fractionally higher than $h_{90}$. Here $h_{90}$ is the conventional value of the Planck constant given by $h_{90}\equiv 4 /( K_{\mathrm{J-90}}^2R_{\mathrm{K-90}})$, where $K_{\mathrm{J-90}}$ and $R_{\mathrm{K-90}}$ denote the conventional values of the Josephson and von Klitzing constants, respectively.
[ { "created": "Fri, 31 Jan 2014 13:29:10 GMT", "version": "v1" }, { "created": "Thu, 24 Apr 2014 19:46:46 GMT", "version": "v2" } ]
2014-04-25
[ [ "Schlamminger", "Stephan", "" ], [ "Haddad", "Darine", "" ], [ "Seifert", "Frank", "" ], [ "Chao", "Leon S", "" ], [ "Newell", "David B", "" ], [ "Liu", "Ruimin", "" ], [ "Steiner", "Richard L", "" ], [ "Pratt", "Jon R", "" ] ]
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1401.8168
Alessandro Tomasoni
Alessandro Tomasoni, Sandro Bellini and Marco Ferrari
Thresholds of absorbing sets in Low-Density-Parity-Check codes
null
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we investigate absorbing sets, responsible of error floors in Low Density Parity Check codes. We look for a concise, quantitative way to rate the absorbing sets' dangerousness. Based on a simplified model for iterative decoding evolution, we show that absorbing sets exhibit a threshold behavior. An absorbing set with at least one channel log-likelihood-ratio below the threshold can stop the convergence towards the right codeword. Otherwise convergence is guaranteed. We show that absorbing sets with negative thresholds can be deactivated simply using proper saturation levels. We propose an efficient algorithm to compute thresholds.
[ { "created": "Fri, 31 Jan 2014 14:13:42 GMT", "version": "v1" } ]
2014-02-03
[ [ "Tomasoni", "Alessandro", "" ], [ "Bellini", "Sandro", "" ], [ "Ferrari", "Marco", "" ] ]
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1401.8170
Pablo Rauzy
Pablo Rauzy (LTCI), Sylvain Guilley
A Formal Proof of Countermeasures against Fault Injection Attacks on CRT-RSA
PROOFS, Santa Barbara, CA : United States (2013)
null
10.1007/s13389-013-0065-3
null
cs.CR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this article, we describe a methodology that aims at either breaking or proving the security of CRT-RSA implementations against fault injection attacks. In the specific case-study of the BellCoRe attack, our work bridges a gap between formal proofs and implementation-level attacks. We apply our results to three implementations of CRT-RSA, namely the unprotected one, that of Shamir, and that of Aum\"uller et al. Our findings are that many attacks are possible on both the unprotected and the Shamir implementations, while the implementation of Aum\"uller et al. is resistant to all single-fault attacks. It is also resistant to double-fault attacks if we consider the less powerful threat-model of its authors.
[ { "created": "Fri, 31 Jan 2014 14:15:28 GMT", "version": "v1" } ]
2014-06-16
[ [ "Rauzy", "Pablo", "", "LTCI" ], [ "Guilley", "Sylvain", "" ] ]
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1401.8172
Pablo Rauzy
Pablo Rauzy (LTCI), Sylvain Guilley
Formal Analysis of CRT-RSA Vigilant's Countermeasure Against the BellCoRe Attack: A Pledge for Formal Methods in the Field of Implementation Security
arXiv admin note: substantial text overlap with arXiv:1401.8170
Program Protection and Reverse Engineering Workshop 2014, San Diego, CA : United States (2014)
10.1145/2556464.2556466
null
cs.CR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In our paper at PROOFS 2013, we formally studied a few known countermeasures to protect CRT-RSA against the BellCoRe fault injection attack. However, we left Vigilant's countermeasure and its alleged repaired version by Coron et al. as future work, because the arithmetical framework of our tool was not sufficiently powerful. In this paper we bridge this gap and then use the same methodology to formally study both versions of the countermeasure. We obtain surprising results, which we believe demonstrate the importance of formal analysis in the field of implementation security. Indeed, the original version of Vigilant's countermeasure is actually broken, but not as much as Coron et al. thought it was. As a consequence, the repaired version they proposed can be simplified. It can actually be simplified even further as two of the nine modular verifications happen to be unnecessary. Fortunately, we could formally prove the simplified repaired version to be resistant to the BellCoRe attack, which was considered a "challenging issue" by the authors of the countermeasure themselves.
[ { "created": "Fri, 31 Jan 2014 14:19:33 GMT", "version": "v1" }, { "created": "Fri, 23 May 2014 18:13:10 GMT", "version": "v2" } ]
2014-05-26
[ [ "Rauzy", "Pablo", "", "LTCI" ], [ "Guilley", "Sylvain", "" ] ]
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1401.8173
Daniel Zaragoza
Daniel Zaragoza
Modeling TCP Throughput with Random Packet Drops
null
null
null
null
cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The present report deals with the modeling of the long-term throughput, a.k.a., send rate, of the Transmission Control Protocol (TCP) under the following assumptions. (i) We consider a single 'infinite source' using a network path from sender to receiver. (ii) Each TCP packet is randomly dropped with probability p; independently of previous drops or any other event/parameter. (iii) The - never changing - receiver window limits the amount of outstanding data. (iv) The receiver acknowledges every packet. (v) The TCP modeled here conforms to the publicly available standards (RFCs) as concerns congestion control. We validate and determine the limits of the different models proposed here using packet-level simulations. The contributions of the present work are the following: (a) We determine three regimes, and their conditions of applicability, depending on p: Linear law regime, square root law regime, and timeout regime. (b) As concerns the relationship between the linear and square root regimes, we give additional insights relatively to previously published work. (c) We give the exact equations governing the TCP send rate in any regime. (d) From the exact equation and under the further condition that the path is not saturated, we give and discuss approximations for the send rate of the NewReno variant of TCP. A by-product of these calculations is the distribution of the sender window, independently of any timing or saturation consideration. (e) These approximations give results that are accurate to a few percent when compared to simulation results. Detailed comparison and sources of errors between theory and simulations are also discussed.
[ { "created": "Fri, 31 Jan 2014 14:20:22 GMT", "version": "v1" } ]
2014-02-03
[ [ "Zaragoza", "Daniel", "" ] ]
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1401.8175
Toshio Suzuki
Toshio Suzuki and Yoshinao Niida
Equilibrium Points of an AND-OR Tree: under Constraints on Probability
13 pages, 3 figures
ANN PURE APPL LOGIC 166, pp. 1150--1164 (2015)
10.1016/j.apal.2015.07.002
null
cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study a probability distribution d on the truth assignments to a uniform binary AND-OR tree. Liu and Tanaka [2007, Inform. Process. Lett.] showed the following: If d achieves the equilibrium among independent distributions (ID) then d is an independent identical distribution (IID). We show a stronger form of the above result. Given a real number r such that 0 < r < 1, we consider a constraint that the probability of the root node having the value 0 is r. Our main result is the following: When we restrict ourselves to IDs satisfying this constraint, the above result of Liu and Tanaka still holds. The proof employs clever tricks of induction. In particular, we show two fundamental relationships between expected cost and probability in an IID on an OR-AND tree: (1) The ratio of the cost to the probability (of the root having the value 0) is a decreasing function of the probability x of the leaf. (2) The ratio of derivative of the cost to the derivative of the probability is a decreasing function of x, too.
[ { "created": "Fri, 31 Jan 2014 14:22:05 GMT", "version": "v1" }, { "created": "Thu, 10 Jul 2014 09:43:16 GMT", "version": "v2" }, { "created": "Wed, 4 Mar 2015 11:56:18 GMT", "version": "v3" } ]
2015-11-05
[ [ "Suzuki", "Toshio", "" ], [ "Niida", "Yoshinao", "" ] ]
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1401.8176
Marian Boguna
Pol Colomer-de-Simon and Marian Boguna
Double percolation phase transition in clustered complex networks
Major improvement of the paper
null
null
null
physics.soc-ph cond-mat.dis-nn cs.SI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The internal organization of complex networks often has striking consequences on either their response to external perturbations or on their dynamical properties. In addition to small-world and scale-free properties, clustering is the most common topological characteristic observed in many real networked systems. In this paper, we report an extensive numerical study on the effects of clustering on the structural properties of complex networks. Strong clustering in heterogeneous networks induces the emergence of a core-periphery organization that has a critical effect on the percolation properties of the networks. We observe a novel double phase transition with an intermediate phase in which only the core of the network is percolated and a final phase in which the periphery percolates regardless of the core. This result implies breaking of the same symmetry at two different values of the control parameter, in stark contrast to the modern theory of continuous phase transitions. Inspired by this core-periphery organization, we introduce a simple model that allows us to analytically prove that such an anomalous phase transition is in fact possible.
[ { "created": "Fri, 31 Jan 2014 14:26:19 GMT", "version": "v1" }, { "created": "Fri, 23 May 2014 17:16:56 GMT", "version": "v2" } ]
2014-05-26
[ [ "Colomer-de-Simon", "Pol", "" ], [ "Boguna", "Marian", "" ] ]
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1401.8185
Ben Allanach PhD
B.C. Allanach
Multiple solutions in supersymmetry and the Higgs
12 pages, 8 figures, write-up of talk delivered at the Royal Society Discussion Meeting "Before, behind and beyond the discovery of the Higgs Boson", January 2014
null
10.1098/rsta.2014.0035
null
hep-ph physics.pop-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Weak-scale supersymmetry is a well motivated, if speculative, theory beyond the Standard Model of particle physics. It solves the thorny issue of the Higgs mass, namely: how can it be stable to quantum corrections, when they are expected to be $10^{15}$ times bigger than its mass? The experimental signal of the theory is the production and measurement of supersymmetric particles in the Large Hadron Collider experiments. No such particles have been seen to date, but hopes are high for the impending run in 2015. Searches for supersymmetric particles can be difficult to interpret. Here, we shall discuss the fact that, even given a well defined model of supersymmetry breaking with few parameters, there can be multiple solutions. These multiple solutions are physically different, and could potentially mean that points in parameter space have been ruled out by interpretations of LHC data when they shouldn't have been. We shall review the multiple solutions and illustrate their existence in a universal model of supersymmetry breaking.
[ { "created": "Fri, 31 Jan 2014 14:59:12 GMT", "version": "v1" } ]
2015-06-18
[ [ "Allanach", "B. C.", "" ] ]
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1401.8192
Anna Kad{\l}ubowska MSc
Michal Klos, Karol Wawrzyniak, Marcin Jakubek, Grzegorz Orynczak
The Scheme of a Novel Methodology for Zonal Division Based on Power Transfer Distribution Factors
7 pages
null
null
null
cs.CE cs.CY cs.SY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
One of the methodologies that carry out the division of the electrical grid into zones is based on the aggregation of nodes characterized by similar Power Transfer Distribution Factors (PTDFs). Here, we point out that satisfactory clustering algorithm should take into account two aspects. First, nodes of similar impact on cross-border lines should be grouped together. Second, cross-border power flows should be relatively insensitive to differences between real and assumed Generation Shift Key matrices. We introduce a theoretical basis of a novel clustering algorithm (BubbleClust) that fulfills these requirements and we perform a case study to illustrate social welfare consequences of the division.
[ { "created": "Fri, 31 Jan 2014 15:28:12 GMT", "version": "v1" }, { "created": "Fri, 18 Jul 2014 09:59:22 GMT", "version": "v2" }, { "created": "Wed, 6 Aug 2014 09:45:46 GMT", "version": "v3" } ]
2014-08-07
[ [ "Klos", "Michal", "" ], [ "Wawrzyniak", "Karol", "" ], [ "Jakubek", "Marcin", "" ], [ "Orynczak", "Grzegorz", "" ] ]
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1401.8196
David Craft
Fazal Khan, David Craft
3D conformal planning using low segment multi-criteria IMRT optimization
null
null
null
null
physics.med-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Purpose: To evaluate automated multicriteria optimization (MCO)-- designed for intensity modulated radiation therapy (IMRT), but invoked with limited segmentation -- to efficiently produce high quality 3D conformal treatment (3D-CRT) plans. Methods: Ten patients previously planned with 3D-CRT were replanned with a low-segment inverse multicriteria optimized technique. The MCO-3D plans used the same number of beams, beam geometry and machine parameters of the corresponding 3D plans, but were limited to an energy of 6 MV. The MCO-3D plans were optimized using a fluence-based MCO IMRT algorithm and then, after MCO navigation, segmented with a low number of segments. The 3D and MCO-3D plans were compared by evaluating mean doses to individual organs at risk (OARs), mean doses to combined OARs, homogeneity indexes (HI), monitor units (MUs), physician preference, and qualitative assessments of planning time and plan customizability. Results: The MCO-3D plans significantly reduced the OAR mean doses and monitor units while maintaining good coverage and homogeneity of target volumes. MCO allows for more streamlined plan customization. All MCO-3D plans were preferred by physicians over their corresponding 3D plans. Conclusion: High quality 3D plans can be produced using IMRT optimization technology, resulting in automated field-in-field type plans with good monitor unit efficiency. Adopting this technology in a clinic could streamline treatment plan production.
[ { "created": "Fri, 31 Jan 2014 15:35:56 GMT", "version": "v1" } ]
2014-02-03
[ [ "Khan", "Fazal", "" ], [ "Craft", "David", "" ] ]
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1401.8199
S\"oren Georg
S\"oren Georg, Matthias M\"uller, Horst Schulte
Wind Turbine Model and Observer in Takagi-Sugeno Model Structure
"The Science of Making Torque from Wind", Oldenburg, Germany, October 2012, European Academy of Wind Energy
null
10.1088/1742-6596/555/1/012042
null
cs.SY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Based on a reduced-order, dynamic nonlinear wind turbine model in Takagi-Sugeno (TS) model structure, a TS state observer is designed as a disturbance observer to estimate the unknown effective wind speed. The TS observer model is an exact representation of the underlying nonlinear model, obtained by means of the sector-nonlinearity approach. The observer gain matrices are obtained by means of a linear matrix inequality (LMI) design approach for optimal fuzzy control, where weighting matrices for the individual system states and outputs are included. The observer is tested in simulations with the aero-elastic code FAST for the NREL 5 MW reference turbine, where it shows a stable behaviour both for IEC wind gusts and turbulent wind input.
[ { "created": "Fri, 31 Jan 2014 15:45:58 GMT", "version": "v1" } ]
2015-06-18
[ [ "Georg", "Sören", "" ], [ "Müller", "Matthias", "" ], [ "Schulte", "Horst", "" ] ]
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1401.8200
Remi Louf
R\'emi Louf, Marc Barthelemy
How congestion shapes cities: from mobility patterns to scaling
15 pages, 4 figures, 2 tables; modified version with additional discussions and references
Sci. Rep. 4, 5561 (2014)
10.1038/srep05561
null
physics.soc-ph cond-mat.dis-nn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The recent availability of data for cities has allowed scientists to exhibit scalings which present themselves in the form of a power-law dependence with population of various socio-economical and structural indicators. We propose here a dynamical, stochastic theory of urban growth which accounts for some of the observed scalings and we confirm these results on US and OECD empirical data. In particular, we show that the dependence with population size of the total number of miles driven daily, the total length of the road network, the total traffic delay, the total consumption of gasoline, the quantity of $CO_2$ emitted and the relation between area and population of cities, are all governed by a single parameter which characterizes the sensitivity to congestion. Finally, our results suggest that diseconomies associated with congestion scale superlinearly with population size, implying that, despite polycentrism, cities whose transportation infrastructure rely heavily on traffic sensitive modes are unsustainable.
[ { "created": "Fri, 31 Jan 2014 15:46:16 GMT", "version": "v1" }, { "created": "Tue, 8 Apr 2014 19:24:05 GMT", "version": "v2" }, { "created": "Fri, 16 May 2014 08:39:08 GMT", "version": "v3" }, { "created": "Thu, 17 Jul 2014 10:11:08 GMT", "version": "v4" } ]
2014-07-18
[ [ "Louf", "Rémi", "" ], [ "Barthelemy", "Marc", "" ] ]
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1401.8201
Dimitri Surinx
George H.L. Fletcher, Marc Gyssens, Dirk Leinders, Dimitri Surinx, Jan Van den Bussche, Dirk Van Gucht, Stijn Vansummeren, Yuqing Wu
Relative Expressive Power of Navigational Querying on Graphs
An extended abstract announcing the results of this paper was presented at the 14th International Conference on Database Theory, Uppsala, Sweden, March 2011
Information Sciences (2015), pp. 390-406
10.1016/j.ins.2014.11.031
null
cs.DB cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Motivated by both established and new applications, we study navigational query languages for graphs (binary relations). The simplest language has only the two operators union and composition, together with the identity relation. We make more powerful languages by adding any of the following operators: intersection; set difference; projection; coprojection; converse; and the diversity relation. All these operators map binary relations to binary relations. We compare the expressive power of all resulting languages. We do this not only for general path queries (queries where the result may be any binary relation) but also for boolean or yes/no queries (expressed by the nonemptiness of an expression). For both cases, we present the complete Hasse diagram of relative expressiveness. In particular the Hasse diagram for boolean queries contains some nontrivial separations and a few surprising collapses.
[ { "created": "Fri, 31 Jan 2014 15:54:31 GMT", "version": "v1" }, { "created": "Fri, 28 Nov 2014 09:28:35 GMT", "version": "v2" } ]
2014-12-30
[ [ "Fletcher", "George H. L.", "" ], [ "Gyssens", "Marc", "" ], [ "Leinders", "Dirk", "" ], [ "Surinx", "Dimitri", "" ], [ "Bussche", "Jan Van den", "" ], [ "Van Gucht", "Dirk", "" ], [ "Vansummeren", "Stijn", "" ], [ "Wu", "Yuqing", "" ] ]
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1401.8204
Thomas Muller
Thomas M\"uller, Francesco Simone Ruggeri, Andrzej J. Kulik, Ulyana Shimanovich, Thomas O. Mason, Tuomas P. J. Knowles, and Giovanni Dietler
Nanoscale spatially resolved infrared spectra from single microdroplets
5 pages, 3 Figures
Lab Chip, 2014,14, 1315-1319
10.1039/C3LC51219C
null
cond-mat.soft physics.bio-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Droplet microfluidics has emerged as a powerful platform allowing a large number of individual reactions to be carried out in spatially distinct microcompartments. Due to their small size, however, the spectroscopic characterisation of species encapsulated in such systems remains challenging. In this paper, we demonstrate the acquisition of infrared spectra from single microdroplets containing aggregation-prone proteins. To this effect, droplets are generated in a microfluidic flow-focussing device and subsequently deposited in a square array onto a ZnSe prism using a micro stamp. After drying, the solutes present in the droplets are illuminated locally by an infrared laser through the prism, and their thermal expansion upon absorption of infrared radiation is measured with an atomic force microscopy tip, granting nanoscale resolution. Using this approach, we resolve structural differences in the amide bands of the spectra of monomeric and aggregated lysozyme from single microdroplets with picolitre volume.
[ { "created": "Fri, 31 Jan 2014 16:00:40 GMT", "version": "v1" } ]
2014-05-30
[ [ "Müller", "Thomas", "" ], [ "Ruggeri", "Francesco Simone", "" ], [ "Kulik", "Andrzej J.", "" ], [ "Shimanovich", "Ulyana", "" ], [ "Mason", "Thomas O.", "" ], [ "Knowles", "Tuomas P. J.", "" ], [ "Dietler", "Giovanni", "" ] ]
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1401.8206
Sanjay Vishwakarma
Sanjay Vishwakarma and A. Chockalingam
Decode-and-Forward Relay Beamforming with Secret and Non-Secret Messages
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null
null
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cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we study beamforming in decode-and-forward (DF) relaying using multiple relays, where the source node sends a secret message as well as a non-secret message to the destination node in the presence of multiple non-colluding eavesdroppers. The non-secret message is transmitted at a fixed rate $R_{0}$ and requires no protection from the eavesdroppers, whereas the secret message needs to be protected from the eavesdroppers. The source and relays operate under a total power constraint. We find the optimum source powers and weights of the relays for both secret and non-secret messages which maximize the worst case secrecy rate for the secret message as well as meet the information rate constraint $R_{0}$ for the non-secret message. We solve this problem for the cases when ($i$) perfect channel state information (CSI) of all links is known, and ($ii$) only the statistical CSI of the eavesdroppers links and perfect CSI of other links are known.
[ { "created": "Fri, 31 Jan 2014 16:09:45 GMT", "version": "v1" } ]
2014-02-03
[ [ "Vishwakarma", "Sanjay", "" ], [ "Chockalingam", "A.", "" ] ]
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1401.8209
EPTCS
Edward Hermann Haeusler (PUC-Rio)
Propositional Logics Complexity and the Sub-Formula Property
In Proceedings DCM 2014, arXiv:1504.01927
EPTCS 179, 2015, pp. 1-16
10.4204/EPTCS.179.1
null
cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In 1979 Richard Statman proved, using proof-theory, that the purely implicational fragment of Intuitionistic Logic (M-imply) is PSPACE-complete. He showed a polynomially bounded translation from full Intuitionistic Propositional Logic into its implicational fragment. By the PSPACE-completeness of S4, proved by Ladner, and the Goedel translation from S4 into Intuitionistic Logic, the PSPACE- completeness of M-imply is drawn. The sub-formula principle for a deductive system for a logic L states that whenever F1,...,Fk proves A, there is a proof in which each formula occurrence is either a sub-formula of A or of some of Fi. In this work we extend Statman result and show that any propositional (possibly modal) structural logic satisfying a particular formulation of the sub-formula principle is in PSPACE. If the logic includes the minimal purely implicational logic then it is PSPACE-complete. As a consequence, EXPTIME-complete propositional logics, such as PDL and the common-knowledge epistemic logic with at least 2 agents satisfy this particular sub-formula principle, if and only if, PSPACE=EXPTIME. We also show how our technique can be used to prove that any finitely many-valued logic has the set of its tautologies in PSPACE.
[ { "created": "Fri, 31 Jan 2014 16:11:43 GMT", "version": "v1" }, { "created": "Fri, 2 May 2014 22:22:12 GMT", "version": "v2" }, { "created": "Fri, 10 Apr 2015 09:30:50 GMT", "version": "v3" } ]
2015-04-13
[ [ "Haeusler", "Edward Hermann", "", "PUC-Rio" ] ]
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1401.8211
Joni Vehmas
Joni Vehmas, Silvio Hrabar, Sergei Tretyakov
Omega Transmission Lines with Applications to Effective Medium Models of Metamaterials
Accepted to be published in Journal of Applied Physics
J. of Applied Physics, vol. 115, p. 134905, 2014
10.1063/1.4869655
null
physics.class-ph physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we introduce the concept of transmission lines with inherent bi-anisotropy and establish an analogy between these lines and volumetric bi-anisotropic materials. In particular, we find under what conditions a periodically loaded transmission line can be treated as an effective omega medium. Two example circuits are introduced and analyzed. The results have two-fold implications: opening a route to emulate electromagnetic properties of bi-anisotropic omega media using transmission-line meshes and understanding and improving effective medium models of composite materials with the use of effective circuit models of unit cells.
[ { "created": "Thu, 30 Jan 2014 14:47:54 GMT", "version": "v1" }, { "created": "Tue, 18 Mar 2014 08:31:22 GMT", "version": "v2" } ]
2015-06-18
[ [ "Vehmas", "Joni", "" ], [ "Hrabar", "Silvio", "" ], [ "Tretyakov", "Sergei", "" ] ]
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1401.8212
Amin Rasekh
Amin Rasekh, Chien-An Chen, Yan Lu
Human Activity Recognition using Smartphone
null
null
null
null
cs.CY cs.HC cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Human activity recognition has wide applications in medical research and human survey system. In this project, we design a robust activity recognition system based on a smartphone. The system uses a 3-dimentional smartphone accelerometer as the only sensor to collect time series signals, from which 31 features are generated in both time and frequency domain. Activities are classified using 4 different passive learning methods, i.e., quadratic classifier, k-nearest neighbor algorithm, support vector machine, and artificial neural networks. Dimensionality reduction is performed through both feature extraction and subset selection. Besides passive learning, we also apply active learning algorithms to reduce data labeling expense. Experiment results show that the classification rate of passive learning reaches 84.4% and it is robust to common positions and poses of cellphone. The results of active learning on real data demonstrate a reduction of labeling labor to achieve comparable performance with passive learning.
[ { "created": "Thu, 30 Jan 2014 17:28:10 GMT", "version": "v1" } ]
2014-02-03
[ [ "Rasekh", "Amin", "" ], [ "Chen", "Chien-An", "" ], [ "Lu", "Yan", "" ] ]
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1401.8218
Riccardo Faccini
R. Faccini, A. Pilloni, A.D. Polosa, M. Angelone, E. Castagna, S. Lecci, S. Loreti, A. Pietropaolo, M. Pillon, M. Sansovini, F. Sarto, V. Violante, R. Bedogni, A. Esposito
Further investigations on the Neutron Flux Generation in a Plasma Discharge Electrolytic Cell
5 pages, 3 figures
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null
nucl-ex physics.ins-det
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Our recent paper on the "Search for Neutron Flux Generation in a Plasma Discharge Electrolytic Cell" [1] has as main goal the validation of the experiment in Ref.[2]. As a follow-up, Ref.[3] moves a set of objections on our procedure and presents argumentations on why the experiments should not yield the same results. We collect here additional material and calculations that contribute to understanding the observed discrepancies. Furthermore we prove that the absence of signals from Indium activation detectors reported also for the experiment of Ref.[2] is a clear indication that neutron production does not occur. [1] R.Faccini et al arXiv:1310.4749 [2] D.Cirillo et al, Key Engineering Materials 495, 104 (2012). [3] A.Widom et al. arXiv:1311.2447
[ { "created": "Thu, 30 Jan 2014 10:02:50 GMT", "version": "v1" } ]
2014-02-03
[ [ "Faccini", "R.", "" ], [ "Pilloni", "A.", "" ], [ "Polosa", "A. D.", "" ], [ "Angelone", "M.", "" ], [ "Castagna", "E.", "" ], [ "Lecci", "S.", "" ], [ "Loreti", "S.", "" ], [ "Pietropaolo", "A.", "" ], [ "Pillon", "M.", "" ], [ "Sansovini", "M.", "" ], [ "Sarto", "F.", "" ], [ "Violante", "V.", "" ], [ "Bedogni", "R.", "" ], [ "Esposito", "A.", "" ] ]
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1401.8219
Konrad Kulakowski
Konrad Ku{\l}akowski
On the Properties of the Priority Deriving Procedure in the Pairwise Comparisons Method
11 pages
null
10.3233/FI-2015-1240
null
cs.DM cs.GT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The pairwise comparisons method is a convenient tool used when the relative order of preferences among different concepts (alternatives) needs to be determined. There are several popular implementations of this method, including the Eigenvector Method, the Least Squares Method, the Chi Squares Method and others. Each of the above methods comes with one or more inconsistency indices that help to decide whether the consistency of input guarantees obtaining a reliable output, thus taking the optimal decision. This article explores the relationship between inconsistency of input and discrepancy of output. A global ranking discrepancy describes to what extent the obtained results correspond to the single expert's assessments. On the basis of the inconsistency and discrepancy indices, two properties of the weight deriving procedure are formulated. These properties are proven for Eigenvector Method and Koczkodaj's Inconsistency Index. Several estimates using Koczkodaj's Inconsistency Index for a principal eigenvalue, Saaty's inconsistency index and the Condition of Order Preservation are also provided.
[ { "created": "Fri, 31 Jan 2014 16:37:34 GMT", "version": "v1" }, { "created": "Thu, 6 Feb 2014 15:55:19 GMT", "version": "v2" }, { "created": "Fri, 20 Jun 2014 12:38:34 GMT", "version": "v3" } ]
2018-02-08
[ [ "Kułakowski", "Konrad", "" ] ]
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1401.8224
Wilfried Noertershaeuser
Matthias Lochmann, Raphael J\"ohren, Christopher Geppert, Zoran Andelkovic, Denis Anielski, Benjamin Botermann, Michael Bussmann, Andreas Dax, Nadja Fr\"ommgen, Michael Hammen, Volker Hannen, Thomas K\"uhl, Yuri A. Litvinov, Rub\'en L\'opez-Coto, Thomas St\"ohlker, Richard C. Thompson, Jonas Vollbrecht, Andrey Volotka, Christian Weinheimer, Weiqiang Wen, Elisa Will, Danyal Winters, Rodolfo S\'anchez, and Wilfried N\"ortersh\"auser
Observation of the hyperfine transition in lithium-like Bismuth $^{209}\text{Bi}^{80+}$: Towards a test of QED in strong magnetic fields
5 pages, 2 figures
Physical Review A 90, 030501(R) (2014)
10.1103/PhysRevA.90.030501
null
physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We performed a laser spectroscopic determination of the $2s$ hyperfine splitting (HFS) of Li-like $^{209}\text{Bi}^{80+}$ and repeated the measurement of the $1s$ HFS of H-like $^{209}\text{Bi}^{82+}$. Both ion species were subsequently stored in the Experimental Storage Ring at the GSI Helmholtzzentrum f\"ur Schwerionenforschung Darmstadt and cooled with an electron cooler at a velocity of $\approx 0.71\,c$. Pulsed laser excitation of the $M1$ hyperfine-transition was performed in anticollinear and collinear geometry for $\text{Bi}^{82+}$ and $\text{Bi}^{80+}$, respectively, and observed by fluorescence detection. We obtain $\Delta E^{(1s)}= 5086.3(11)\,\textrm{meV}$ for $\text{Bi}^{82+}$, different from the literature value, and $\Delta E^{(2s)}= 797.50(18)\,\textrm{meV}$ for $\text{Bi}^{80+}$. These values provide experimental evidence that a specific difference between the two splitting energies can be used to test QED calculations in the strongest static magnetic fields available in the laboratory independent of nuclear structure effects. The experimental result is in excellent agreement with the theoretical prediction and confirms the sum of the Dirac term and the relativistic interelectronic-interaction correction at a level of 0.5% confirming the importance of accounting for the Breit interaction.
[ { "created": "Fri, 31 Jan 2014 16:49:58 GMT", "version": "v1" }, { "created": "Thu, 30 Oct 2014 16:54:32 GMT", "version": "v2" } ]
2014-10-31
[ [ "Lochmann", "Matthias", "" ], [ "Jöhren", "Raphael", "" ], [ "Geppert", "Christopher", "" ], [ "Andelkovic", "Zoran", "" ], [ "Anielski", "Denis", "" ], [ "Botermann", "Benjamin", "" ], [ "Bussmann", "Michael", "" ], [ "Dax", "Andreas", "" ], [ "Frömmgen", "Nadja", "" ], [ "Hammen", "Michael", "" ], [ "Hannen", "Volker", "" ], [ "Kühl", "Thomas", "" ], [ "Litvinov", "Yuri A.", "" ], [ "López-Coto", "Rubén", "" ], [ "Stöhlker", "Thomas", "" ], [ "Thompson", "Richard C.", "" ], [ "Vollbrecht", "Jonas", "" ], [ "Volotka", "Andrey", "" ], [ "Weinheimer", "Christian", "" ], [ "Wen", "Weiqiang", "" ], [ "Will", "Elisa", "" ], [ "Winters", "Danyal", "" ], [ "Sánchez", "Rodolfo", "" ], [ "Nörtershäuser", "Wilfried", "" ] ]
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1401.8226
Prasanth Karunakaran
Prasanth Karunakaran, Thomas Wagner, Ansgar Scherb and Wolfgang Gerstacker
Sensing for Spectrum Sharing in Cognitive LTE-A Cellular Networks
null
null
null
null
cs.NI cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this work we present a case for dynamic spectrum sharing between different operators in systems with carrier aggregation (CA) which is an important feature in 3GPP LTE-A systems. Cross-carrier scheduling and sensing are identified as key enablers for such spectrum sharing in LTE-A. Sensing is classified as Type 1 sensing and Type 2 sensing and the role of each in the system operation is discussed. The more challenging Type 2 sensing which involves sensing the interfering signal in the presence of a desired signal is studied for a single-input single-output system. Energy detection and the most powerful test are formulated. The probability of false alarm and of detection are analyzed for energy detectors. Performance evaluations show that reasonable sensing performance can be achieved with the use of channel state information, making such sensing practically viable.
[ { "created": "Thu, 30 Jan 2014 14:45:06 GMT", "version": "v1" } ]
2014-02-03
[ [ "Karunakaran", "Prasanth", "" ], [ "Wagner", "Thomas", "" ], [ "Scherb", "Ansgar", "" ], [ "Gerstacker", "Wolfgang", "" ] ]
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1401.8228
George Throumoulopoulos
H. Tasso, G. N. Throumoulopoulos
Tokamak-like Vlasov equilibria
11 pages
null
10.1140/epjd/e2014-50007-9
null
physics.plasm-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Vlasov equilibria of axisymmetric plasmas with vacuum toroidal magnetic field can be reduced, up to a selection of ions and electrons distributions functions, to a Grad-Shafranov-like equation. Quasineutrality narrow the choice of the distributions functions. In contrast to two-dimensional translationally symmetric equilibria whose electron distribution function consists of a displaced Maxwellian, the toroidal equilibria need deformed Maxwellians. In order to be able to carry through the calculations, this deformation is produced by means of either a Heaviside step function or an exponential function. The resulting Grad-Shafranov-like equations are established explicitly.
[ { "created": "Fri, 31 Jan 2014 16:56:00 GMT", "version": "v1" } ]
2015-06-18
[ [ "Tasso", "H.", "" ], [ "Throumoulopoulos", "G. N.", "" ] ]
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1401.8230
Vadim Demchik
Vadim Demchik and Alexey Gulov
Increasing precision of uniform pseudorandom number generators
5 pages, 1 figure; additional description of algorithm is applied
null
null
null
cs.MS cs.CR cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A general method to produce uniformly distributed pseudorandom numbers with extended precision by combining two pseudorandom numbers with lower precision is proposed. In particular, this method can be used for pseudorandom number generation with extended precision on graphics processing units (GPU), where the performance of single and double precision operations can vary significantly.
[ { "created": "Wed, 29 Jan 2014 20:20:18 GMT", "version": "v1" }, { "created": "Mon, 12 May 2014 12:45:45 GMT", "version": "v2" } ]
2014-05-13
[ [ "Demchik", "Vadim", "" ], [ "Gulov", "Alexey", "" ] ]
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1401.8231
Thomas Heimburg
Kaare Graesboll, Henrike Sasse-Middelhoff and Thomas Heimburg
The thermodynamics of general and local anesthesia
12 pages, 9 figures, 1 table
Biophys. J. 2014, 106: 2143-2156
10.1016/j.bpj.2014.04.014
null
physics.bio-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
General anesthetics are known to cause depression of the freezing point of transitions in biomembranes. This is a consequence of ideal mixing of the anesthetic drugs in the membrane fluid phase and exclusion from the solid phase. Such a generic law provides physical justification of the famous Meyer-Overton rule. We show here that general anesthetics, barbiturates and local anesthetics all display the same effect on melting transitions. Their effect is reversed by hydrostatic pressure. Thus, the thermodynamic behavior of local anesthetics is very similar to that of general anesthetics. We present a detailed thermodynamic analysis of heat capacity profiles of membranes in the presence of anesthetics. This analysis is able to describe experimentally observed calorimetric profiles and permits prediction of the anesthetic features of arbitrary molecules. In addition, we discuss the thermodynamic origin of the cutoff-effect of long-chain alcohols and the additivity of the effect of general and local anesthetics.
[ { "created": "Fri, 31 Jan 2014 17:07:57 GMT", "version": "v1" } ]
2020-08-10
[ [ "Graesboll", "Kaare", "" ], [ "Sasse-Middelhoff", "Henrike", "" ], [ "Heimburg", "Thomas", "" ] ]
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1401.8234
Thibaut Divoux
Mathieu Leocmach, Christophe Perge, Thibaut Divoux, S\'ebastien Manneville
Creep and Fracture of a Protein Gel under Stress
5 pages, 4 figures - Supplemental material: 3 pages, 4 figures available at the following URL: http://www.crpp-bordeaux.cnrs.fr/~divoux/publications/PRL_14_Protein_Gels_SM.pdf
Phys. Rev. Lett. 113, 038303 (2014)
10.1103/PhysRevLett.113.038303
null
cond-mat.soft cond-mat.mtrl-sci physics.bio-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Biomaterials such as protein or polysaccharide gels are known to behave qualitatively as soft solids and to rupture under an external load. Combining optical and ultrasonic imaging to shear rheology we show that the failure scenario of a protein gel is reminiscent of brittle solids: after a primary creep regime characterized by a power-law behavior which exponent is fully accounted for by linear viscoelasticity, fractures nucleate and grow logarithmically perpendicularly to shear, up to the sudden rupture of the gel. A single equation accounting for those two successive processes nicely captures the full rheological response. The failure time follows a decreasing power law with the applied shear stress, similar to the Basquin law of fatigue for solids. These results are in excellent agreement with recent fiber-bundle models that include damage accumulation on elastic fibers and exemplify protein gels as model, brittle-like soft solids.
[ { "created": "Fri, 31 Jan 2014 17:24:19 GMT", "version": "v1" }, { "created": "Tue, 19 Aug 2014 09:51:51 GMT", "version": "v2" } ]
2014-08-21
[ [ "Leocmach", "Mathieu", "" ], [ "Perge", "Christophe", "" ], [ "Divoux", "Thibaut", "" ], [ "Manneville", "Sébastien", "" ] ]
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1401.8235
Donald Morton Dr
Donald C. Morton
An Astronomer's View of Climate Change
8 pages, 8 figures, 1 table
Journal of the Royal Astronomical Society of Canada, v. 108, p. 27, (2013)
null
null
physics.ao-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper describes some of the astronomical effects that could be important for understanding the ice ages, historic climate changes and the recent temperature increase. These include changes in the sun's luminosity, periodic changes in the earth's orbital parameters, the sun's orbit around our galaxy, the variability of solar activity and the anticorrelation of cosmic ray flux with that activity. Finally recent trends in solar activity and global temperatures are compared with the predictions of climate models.
[ { "created": "Fri, 17 Jan 2014 07:18:22 GMT", "version": "v1" } ]
2014-02-03
[ [ "Morton", "Donald C.", "" ] ]
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1401.8241
Fabrizio Illuminati
Stefano Zippilli, Fabrizio Illuminati
Non-Markovian dynamics and steady-state entanglement of cavity arrays in finite-bandwidth squeezed reservoirs
12 pages, 14 figures
Phys. Rev. A 89, 033803 (2014)
10.1103/PhysRevA.89.033803
null
quant-ph cond-mat.stat-mech physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
When two chains of quantum systems are driven at their ends by a two-mode squeezed reservoir, they approach a steady state characterized by the formation of many entangled pairs. Each pair is made of one element of the first and one of the second chain. This effect has been already predicted under the assumption of broadband squeezing. Here we investigate the situation of finite-bandwidth reservoirs. This is done by modeling the driving bath as the output field of a non-degenerate parametric oscillator. The resulting non-Markovian dynamics is studied within the theoretical framework of cascade open quantum systems. It is shown that the formation of pair-entangled structures occurs as long as the normal-mode splitting of the arrays does not overcome the squeezing bandwidth of the reservoir.
[ { "created": "Fri, 31 Jan 2014 17:48:35 GMT", "version": "v1" }, { "created": "Sun, 16 Feb 2014 15:27:48 GMT", "version": "v2" } ]
2014-03-10
[ [ "Zippilli", "Stefano", "" ], [ "Illuminati", "Fabrizio", "" ] ]
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1401.8242
Mikael Vejdemo-Johansson
Dan Hirsch and Ingemar Markstr\"om and Meredith L Patterson and Anders Sandberg and Mikael Vejdemo-Johansson
More ties than we thought
Accepted at PeerJ Computer Science 12 pages, 6 color photographs
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null
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cs.FL cs.CG math.CO math.GN
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We extend the existing enumeration of neck tie-knots to include tie-knots with a textured front, tied with the narrow end of a tie. These tie-knots have gained popularity in recent years, based on reconstructions of a costume detail from The Matrix Reloaded, and are explicitly ruled out in the enumeration by Fink and Mao (2000). We show that the relaxed tie-knot description language that comprehensively describes these extended tie-knot classes is context free. It has a regular sub-language that covers all the knots that originally inspired the work. From the full language, we enumerate 266 682 distinct tie-knots that seem tie-able with a normal neck-tie. Out of these 266 682, we also enumerate 24 882 tie-knots that belong to the regular sub-language.
[ { "created": "Fri, 31 Jan 2014 17:54:19 GMT", "version": "v1" }, { "created": "Wed, 6 May 2015 05:50:32 GMT", "version": "v2" } ]
2015-05-07
[ [ "Hirsch", "Dan", "" ], [ "Markström", "Ingemar", "" ], [ "Patterson", "Meredith L", "" ], [ "Sandberg", "Anders", "" ], [ "Vejdemo-Johansson", "Mikael", "" ] ]
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1401.8244
Chun Meng
Chun Meng, Minghua Chen, Athina Markopoulou
On Routing-Optimal Network for Multiple Unicasts
null
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we consider networks with multiple unicast sessions. Generally, non-linear network coding is needed to achieve the whole rate region of network coding. Yet, there exist networks for which routing is sufficient to achieve the whole rate region, and we refer to them as routing-optimal networks. We identify a class of routing-optimal networks, which we refer to as information-distributive networks, defined by three topological features. Due to these features, for each rate vector achieved by network coding, there is always a routing scheme such that it achieves the same rate vector, and the traffic transmitted through the network is exactly the information transmitted over the cut-sets between the sources and the sinks in the corresponding network coding scheme. We present more examples of information-distributive networks, including some examples from index coding and single unicast with hard deadline constraint.
[ { "created": "Fri, 31 Jan 2014 18:01:15 GMT", "version": "v1" }, { "created": "Tue, 8 Apr 2014 20:41:03 GMT", "version": "v2" }, { "created": "Fri, 25 Apr 2014 23:26:18 GMT", "version": "v3" }, { "created": "Wed, 30 Apr 2014 18:37:40 GMT", "version": "v4" } ]
2014-05-01
[ [ "Meng", "Chun", "" ], [ "Chen", "Minghua", "" ], [ "Markopoulou", "Athina", "" ] ]
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1401.8247
Aiqun Huang
Aiqun Huang, Aniket Bhattacharya and Kurt Binder
Conformations, Transverse Fluctuations and Crossover Dynamics of a Semi-Flexible Chain in Two Dimensions
14 pages, 18 figures
null
10.1063/1.4879537
null
physics.bio-ph cond-mat.soft
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a unified scaling description for the dynamics of monomers of a semiflexible chain under good solvent condition in the free draining limit. We consider both the cases where the contour length $L$ is comparable to the persistence length $\ell_p$ and the case $L\gg \ell_p$. Our theory captures the early time monomer dynamics of a stiff chain characterized by $t^{3/4}$ dependence for the mean square displacement(MSD) of the monomers, but predicts a first crossover to the Rouse regime of $t^{2\nu/{1+2\nu}}$ for $\tau_1 \sim \ell_p^3$, and a second crossover to the purely diffusive dynamics for the entire chain at $\tau_2 \sim L^{5/2}$. We confirm the predictions of this scaling description by studying monomer dynamics of dilute solution of semi-flexible chains under good solvent conditions obtained from our Brownian dynamics (BD) simulation studies for a large choice of chain lengths with number of monomers per chain N = 16 - 2048 and persistence length $\ell_p = 1 - 500$ Lennard-Jones (LJ) units. These BD simulation results further confirm the absence of Gaussian regime for a 2d swollen chain from the slope of the plot of $\langle R_N^2 \rangle/2L \ell_p \sim L/\ell_p$ which around $L/\ell_p \sim 1$ changes suddenly from $\left(L/\ell_p \right) \rightarrow \left(L/\ell_p \right)^{0.5} $, also manifested in the power law decay for the bond autocorrelation function disproving the validity of the WLC in 2d. We further observe that the normalized transverse fluctuations of the semiflexible chains for different stiffness $\sqrt{\langle l_{\bot}^2\rangle}/L$ as a function of renormalized contour length $L/\ell_p$ collapse on the same master plot and exhibits power law scaling $\sqrt{\langle l_{\bot}^2\rangle}/L \sim (L/\ell_p)^\eta $ at extreme limits, where $\eta = 0.5$ for extremely stiff chains ($L/\ell_p \gg 1$), and $\eta = -0.25$ for fully flexible chains.
[ { "created": "Fri, 31 Jan 2014 18:31:22 GMT", "version": "v1" }, { "created": "Mon, 2 Jun 2014 17:08:18 GMT", "version": "v2" } ]
2015-06-18
[ [ "Huang", "Aiqun", "" ], [ "Bhattacharya", "Aniket", "" ], [ "Binder", "Kurt", "" ] ]
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1401.8252
Abdessamad Mouzoune
Abdessamad Mouzoune, Saoudi Taibi
Introducing E-maintenance 2.0
11 pages, 1 figure
International Journal of Computer Science and Business Informatics, Vol. 9, No. 1, pp. 80-90
null
null
cs.OH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
While research literature is still debating e-maintenance definition, a new reality is emerging in business world confirming the enterprise 2.0 model. Executives are more and more forced to stop running against current trend towards social media and instead envisage harnessing its power within the enterprise. Maintenance can't be an exception for long and has to take advantage of new opportunities created by social technological innovations. In this paper, a combination of pure E perspective and 2.0 perspective is proposed to avoid a lock-in and allow continous evolution of e-maintenance within the new context of business: A combination of data centric models and people oriented applications to form a collaborative environment in order to conceive and achieve global goals of maintenance.New challenges are also to be expected as to the effecient integration of enterprise 2.0 tools within current e-maintenance platforms and futher research work is still to be done in this area.
[ { "created": "Fri, 31 Jan 2014 18:38:56 GMT", "version": "v1" } ]
2014-02-03
[ [ "Mouzoune", "Abdessamad", "" ], [ "Taibi", "Saoudi", "" ] ]
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1401.8255
Kevin Carter
Kevin M. Carter, Hamed Okhravi, and James Riordan
Quantitative Analysis of Active Cyber Defenses Based on Temporal Platform Diversity
null
null
null
null
cs.CR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Active cyber defenses based on temporal platform diversity have been proposed as way to make systems more resistant to attacks. These defenses change the properties of the platforms in order to make attacks more complicated. Unfortunately, little work has been done on measuring the effectiveness of these defenses. In this work, we use four different approaches to quantitatively analyze these defenses; an abstract analysis studies the algebraic models of a temporal platform diversity system; a set of experiments on a test bed measures the metrics of interest for the system; a game theoretic analysis studies the impact of preferential selection of platforms and derives an optimal strategy; finally, a set of simulations evaluates the metrics of interest on the models. Our results from these approaches all agree and yet are counter-intuitive. We show that although platform diversity can mitigate some attacks, it can be detrimental for others. We also illustrate that the benefit from these systems heavily depends on their threat model and that the preferential selection of platforms can achieve better protection.
[ { "created": "Fri, 31 Jan 2014 18:48:01 GMT", "version": "v1" } ]
2014-02-03
[ [ "Carter", "Kevin M.", "" ], [ "Okhravi", "Hamed", "" ], [ "Riordan", "James", "" ] ]
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1401.8256
James Maloney
J.A. Maloney, V.S. Morozov, Ya. S. Derbenev, A. Afanasev, R.P. Johnson, C.A. Ankenbrandt, C. Yoshikawa, K. Yonehara, D. Neuffer, B. Erdelyi
Numerical Studies of Optimization and Aberration Correction Methods for the Preliminary Demonstration of the Parametric Ionization Cooling (PIC) Principle in the Twin Helix Muon Cooling Channel
null
null
null
null
physics.acc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Muon colliders have been proposed for the next generation of particle accelerators that study high-energy physics at the energy and intensity frontiers. In this paper we study a possible implementation of muon ionization cooling, Parametric-resonance Ionization Cooling (PIC), in the twin helix channel. The resonant cooling method of PIC offers the potential to reduce emittance beyond that achievable with ionization cooling with ordinary magnetic focusing. We examine optimization of a variety of parameters, study the nonlinear dynamics in the twin helix channel and consider possible methods of aberration correction.
[ { "created": "Fri, 31 Jan 2014 18:48:31 GMT", "version": "v1" } ]
2014-02-03
[ [ "Maloney", "J. A.", "" ], [ "Morozov", "V. S.", "" ], [ "Derbenev", "Ya. S.", "" ], [ "Afanasev", "A.", "" ], [ "Johnson", "R. P.", "" ], [ "Ankenbrandt", "C. A.", "" ], [ "Yoshikawa", "C.", "" ], [ "Yonehara", "K.", "" ], [ "Neuffer", "D.", "" ], [ "Erdelyi", "B.", "" ] ]
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1401.8257
Shuai Li
Claudio Gentile, Shuai Li, Giovanni Zappella
Online Clustering of Bandits
In E. Xing and T. Jebara (Eds.), Proceedings of 31st International Conference on Machine Learning, Journal of Machine Learning Research Workshop and Conference Proceedings, Vol.32 (JMLR W&CP-32), Beijing, China, Jun. 21-26, 2014 (ICML 2014), Submitted by Shuai Li (https://sites.google.com/site/shuailidotsli)
null
null
null
cs.LG stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We introduce a novel algorithmic approach to content recommendation based on adaptive clustering of exploration-exploitation ("bandit") strategies. We provide a sharp regret analysis of this algorithm in a standard stochastic noise setting, demonstrate its scalability properties, and prove its effectiveness on a number of artificial and real-world datasets. Our experiments show a significant increase in prediction performance over state-of-the-art methods for bandit problems.
[ { "created": "Fri, 31 Jan 2014 18:49:42 GMT", "version": "v1" }, { "created": "Tue, 13 May 2014 07:13:06 GMT", "version": "v2" }, { "created": "Fri, 6 Jun 2014 13:59:04 GMT", "version": "v3" } ]
2014-06-09
[ [ "Gentile", "Claudio", "" ], [ "Li", "Shuai", "" ], [ "Zappella", "Giovanni", "" ] ]
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1401.8261
Ognjen Arandjelovi\'c PhD
Reza Shoja Ghiass, Ognjen Arandjelovic, Hakim Bendada, Xavier Maldague
Infrared face recognition: a comprehensive review of methodologies and databases
Pattern Recognition, 2014. arXiv admin note: substantial text overlap with arXiv:1306.1603
null
null
null
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Automatic face recognition is an area with immense practical potential which includes a wide range of commercial and law enforcement applications. Hence it is unsurprising that it continues to be one of the most active research areas of computer vision. Even after over three decades of intense research, the state-of-the-art in face recognition continues to improve, benefitting from advances in a range of different research fields such as image processing, pattern recognition, computer graphics, and physiology. Systems based on visible spectrum images, the most researched face recognition modality, have reached a significant level of maturity with some practical success. However, they continue to face challenges in the presence of illumination, pose and expression changes, as well as facial disguises, all of which can significantly decrease recognition accuracy. Amongst various approaches which have been proposed in an attempt to overcome these limitations, the use of infrared (IR) imaging has emerged as a particularly promising research direction. This paper presents a comprehensive and timely review of the literature on this subject. Our key contributions are: (i) a summary of the inherent properties of infrared imaging which makes this modality promising in the context of face recognition, (ii) a systematic review of the most influential approaches, with a focus on emerging common trends as well as key differences between alternative methodologies, (iii) a description of the main databases of infrared facial images available to the researcher, and lastly (iv) a discussion of the most promising avenues for future research.
[ { "created": "Wed, 29 Jan 2014 01:04:10 GMT", "version": "v1" } ]
2014-02-03
[ [ "Ghiass", "Reza Shoja", "" ], [ "Arandjelovic", "Ognjen", "" ], [ "Bendada", "Hakim", "" ], [ "Maldague", "Xavier", "" ] ]
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1401.8265
Soheil Gherekhloo
Soheil Gherekhloo, Chen Di, Anas Chaaban, Aydin Sezgin
Sub-optimality of Treating Interference as Noise in the Cellular Uplink with Weak Interference
This paper is an extended version of the paper http://arxiv.org/abs/1105.5072, presented at ITG WSA, 2012
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cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Despite the simplicity of the scheme of treating interference as noise (TIN), it was shown to be sum-capacity optimal in the Gaussian interference channel (IC) with very-weak (noisy) interference. In this paper, the 2-user IC is altered by introducing an additional transmitter that wants to communicate with one of the receivers of the IC. The resulting network thus consists of a point-to-point channel interfering with a multiple access channel (MAC) and is denoted PIMAC. The sum-capacity of the PIMAC is studied with main focus on the optimality of TIN. It turns out that TIN in its naive variant, where all transmitters are active and both receivers use TIN for decoding, is not the best choice for the PIMAC. In fact, a scheme that combines both time division multiple access and TIN (TDMA-TIN) strictly outperforms the naive-TIN scheme. Furthermore, it is shown that in some regimes, TDMA-TIN achieves the sum-capacity for the deterministic PIMAC and the sum-capacity within a constant gap for the Gaussian PIMAC. Additionally, it is shown that, even for very-weak interference, there are some regimes where a combination of interference alignment with power control and treating interference as noise at the receiver side outperforms TDMA-TIN. As a consequence, on the one hand treating interference as noise in a cellular uplink is approximately optimal in certain regimes. On the other hand those regimes cannot be simply described by the strength of interference.
[ { "created": "Fri, 31 Jan 2014 19:15:47 GMT", "version": "v1" }, { "created": "Mon, 20 Apr 2015 16:52:55 GMT", "version": "v2" } ]
2015-04-21
[ [ "Gherekhloo", "Soheil", "" ], [ "Di", "Chen", "" ], [ "Chaaban", "Anas", "" ], [ "Sezgin", "Aydin", "" ] ]
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1401.8268
Georg Ganzenmueller
Georg C. Ganzenm\"uller and Stefan Hiermaier and Michael May
On the similarity of meshless discretizations of Peridynamics and Smooth-Particle Hydrodynamics
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null
null
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physics.comp-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper discusses the similarity of meshless discretizations of Peridynamics and Smooth-Particle-Hydrodynamics (SPH), if Peridynamics is applied to classical material models based on the deformation gradient. We show that the discretized equations of both methods coincide if nodal integration is used. This equivalence implies that Peridynamics reduces to an old meshless method and all instability problems of collocation-type particle methods apply. These instabilities arise as a consequence of the nodal integration scheme, which causes rank-deficiency and leads to spurious zero-energy modes. As a result of the demonstrated equivalence to SPH, enhanced implementations of Peridynamics should employ more accurate integration schemes.
[ { "created": "Fri, 31 Jan 2014 19:26:10 GMT", "version": "v1" }, { "created": "Fri, 24 Oct 2014 08:45:28 GMT", "version": "v2" } ]
2014-10-27
[ [ "Ganzenmüller", "Georg C.", "" ], [ "Hiermaier", "Stefan", "" ], [ "May", "Michael", "" ] ]
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1401.8269
Peter Turney
Peter D. Turney and Saif M. Mohammad
Experiments with Three Approaches to Recognizing Lexical Entailment
to appear in Natural Language Engineering
Natural Language Engineering, 21 (3), (2015), 437-476
10.1017/S1351324913000387
null
cs.CL cs.AI cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Inference in natural language often involves recognizing lexical entailment (RLE); that is, identifying whether one word entails another. For example, "buy" entails "own". Two general strategies for RLE have been proposed: One strategy is to manually construct an asymmetric similarity measure for context vectors (directional similarity) and another is to treat RLE as a problem of learning to recognize semantic relations using supervised machine learning techniques (relation classification). In this paper, we experiment with two recent state-of-the-art representatives of the two general strategies. The first approach is an asymmetric similarity measure (an instance of the directional similarity strategy), designed to capture the degree to which the contexts of a word, a, form a subset of the contexts of another word, b. The second approach (an instance of the relation classification strategy) represents a word pair, a:b, with a feature vector that is the concatenation of the context vectors of a and b, and then applies supervised learning to a training set of labeled feature vectors. Additionally, we introduce a third approach that is a new instance of the relation classification strategy. The third approach represents a word pair, a:b, with a feature vector in which the features are the differences in the similarities of a and b to a set of reference words. All three approaches use vector space models (VSMs) of semantics, based on word-context matrices. We perform an extensive evaluation of the three approaches using three different datasets. The proposed new approach (similarity differences) performs significantly better than the other two approaches on some datasets and there is no dataset for which it is significantly worse. Our results suggest it is beneficial to make connections between the research in lexical entailment and the research in semantic relation classification.
[ { "created": "Fri, 31 Jan 2014 19:42:19 GMT", "version": "v1" } ]
2015-06-02
[ [ "Turney", "Peter D.", "" ], [ "Mohammad", "Saif M.", "" ] ]
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Experiments with Three Approaches to Recognizing Lexical Entailment
http://arxiv.org/abs/1401.8269v1
http://arxiv.org/pdf/1401.8269v1.pdf
https://github.com/context-mover/HypEval
false
false
https://paperswithcode.com/paper/experiments-with-three-approaches-to
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1401.8270
Sujit Datta
Sujit S. Datta, Alireza Abbaspourrad, David A. Weitz
Expansion and rupture of charged microcapsules
Supplementary information available online at journal webpage
Materials Horizons 1, 92-95 (2014)
10.1039/C3MH00099K
null
cond-mat.soft cond-mat.mes-hall cond-mat.mtrl-sci physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the deformations of pH-responsive spherical microcapsules -- micrometer-scale liquid drops surrounded by thin, solid shells -- under the influence of electrostatic forces. When exposed to a large concentration of NaOH, the microcapsules become highly charged, and expand isotropically. We find that the extent of this expansion can be understood by coupling electrostatics with shell theory; moreover, the expansion dynamics is well described by Darcy's law for fluid flow through the microcapsule shell. Unexpectedly, however, below a threshold NaOH concentration, the microcapsules begin to disintegrate, and eventually rupture; they then expand non-uniformly, ultimately forming large, jellyfish-like structures. Our results highlight the fascinating range of behaviors exhibited by pH-responsive microcapsules, driven by the interplay between electrostatic and mechanical forces.
[ { "created": "Fri, 31 Jan 2014 19:42:49 GMT", "version": "v1" } ]
2014-02-03
[ [ "Datta", "Sujit S.", "" ], [ "Abbaspourrad", "Alireza", "" ], [ "Weitz", "David A.", "" ] ]
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1401.8274
Mikael Kuusela
Mikael Kuusela and Victor M. Panaretos
Empirical Bayes unfolding of elementary particle spectra at the Large Hadron Collider
40 pages, 10 figures
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null
null
stat.AP hep-ex physics.data-an stat.ME
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider the so-called unfolding problem in experimental high energy physics, where the goal is to estimate the true spectrum of elementary particles given observations distorted by measurement error due to the limited resolution of a particle detector. This an important statistical inverse problem arising in the analysis of data at the Large Hadron Collider at CERN. Mathematically, the problem is formalized as one of estimating the intensity function of an indirectly observed Poisson point process. Particle physicists are particularly keen on unfolding methods that feature a principled way of choosing the regularization strength and allow for the quantification of the uncertainty inherent in the solution. Though there are many approaches that have been considered by experimental physicists, it can be argued that few -- if any -- of these deal with these two key issues in a satisfactory manner. In this paper, we propose to attack the unfolding problem within the framework of empirical Bayes estimation: we consider Bayes estimators of the coefficients of a basis expansion of the unknown intensity, using a regularizing prior; and employ a Monte Carlo expectation-maximization algorithm to find the marginal maximum likelihood estimate of the hyperparameter controlling the strength of the regularization. Due to the data-driven choice of the hyperparameter, credible intervals derived using the empirical Bayes posterior lose their subjective Bayesian interpretation. Since the properties and meaning of such intervals are poorly understood, we explore instead the use of bootstrap resampling for constructing purely frequentist confidence bands for the true intensity. The performance of the proposed methodology is demonstrated using both simulations and real data from the Large Hadron Collider.
[ { "created": "Fri, 31 Jan 2014 20:01:23 GMT", "version": "v1" } ]
2014-02-03
[ [ "Kuusela", "Mikael", "" ], [ "Panaretos", "Victor M.", "" ] ]
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1401.8276
Oleg Kirillov N
Oleg N. Kirillov, Frank Stefani, and Yasuhide Fukumoto
Local instabilities in magnetized rotational flows: A short-wavelength approach
39 pages, 13 figures, fig 10 modified, refs added, a new section added, minor typos corrected
Journal of Fluid Mechanics, 760: 591-633 (2014)
10.1017/jfm.2014.614
null
physics.flu-dyn astro-ph.SR math.DS physics.plasm-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We perform a local stability analysis of rotational flows in the presence of a constant vertical magnetic field and an azimuthal magnetic field with a general radial dependence. Employing the short-wavelength approximation we develop a unified framework for the investigation of the standard, the helical, and the azimuthal version of the magnetorotational instability, as well as of current-driven kink-type instabilities. Considering the viscous and resistive setup, our main focus is on the case of small magnetic Prandtl numbers which applies, e.g., to liquid metal experiments but also to the colder parts of accretion disks. We show that the inductionless versions of MRI that were previously thought to be restricted to comparably steep rotation profiles extend well to the Keplerian case if only the azimuthal field slightly deviates from its current-free (in the fluid) profile. We find an explicit criterion separating the pure azimuthal inductionless magnetorotational instability from the regime where this instability is mixed with the Tayler instability. We further demonstrate that for particular parameter configurations the azimuthal MRI originates as a result of a dissipation-induced instability of the Chandrasekhar's equipartition solution of ideal magnetohydrodynamics.
[ { "created": "Thu, 30 Jan 2014 14:15:22 GMT", "version": "v1" }, { "created": "Fri, 27 Jun 2014 15:28:36 GMT", "version": "v2" }, { "created": "Fri, 8 Aug 2014 12:40:22 GMT", "version": "v3" }, { "created": "Sun, 28 Sep 2014 20:47:54 GMT", "version": "v4" } ]
2014-11-14
[ [ "Kirillov", "Oleg N.", "" ], [ "Stefani", "Frank", "" ], [ "Fukumoto", "Yasuhide", "" ] ]
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1401.8278
Yingjie Li
Yingjie Li (Michigan State University), Lanfa Wang (SLAC National Accelerator Laboratory)
Space charge impedances of a rectangular beam with longitudinal density modulations inside a rectangular chamber
13 pages, 9 figures, submitted to Nuclear Instruments and Methods in Physics Research Section A
Nuclear Instruments and Methods in Physics Research A 747 2014 30
10.1016/j.nima.2014.02.024
null
physics.acc-ph
http://creativecommons.org/licenses/by/3.0/
This paper studies the space charge impedances of a rectangular beam inside a rectangular chamber, and the limiting case, e.g., a rectangular beam between parallel plates, respectively. The charged beam has uniform density in vertical direction and arbitrary distribution in horizontal direction. The method of separation of variables is used to calculate the space charge potentials, fields, and impedances which are valid in the whole perturbation wavelength spectrum. Comparisons between the theoretical calculations and the numerical simulations are also provided and they match quite well. It is shown that the rectangular beam shape may help to reduce the longitudinal space charge impedances.
[ { "created": "Fri, 31 Jan 2014 20:15:41 GMT", "version": "v1" } ]
2014-07-08
[ [ "Li", "Yingjie", "", "Michigan State University" ], [ "Wang", "Lanfa", "", "SLAC National\n Accelerator Laboratory" ] ]
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1401.8294
Matjaz Perc
Attila Szolnoki, Matjaz Perc
Evolution of extortion in structured populations
5 two-column pages, 4 figures; accepted for publication in Physical Review E
Phys. Rev. E 89 (2014) 022804
10.1103/PhysRevE.89.022804
null
physics.soc-ph cs.GT q-bio.PE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Extortion strategies can dominate any opponent in an iterated prisoner's dilemma game. But if players are able to adopt the strategies performing better, extortion becomes widespread and evolutionary unstable. It may sometimes act as a catalyst for the evolution of cooperation, and it can also emerge in interactions between two populations, yet it is not the evolutionary stable outcome. Here we revisit these results in the realm of spatial games. We find that pairwise imitation and birth-death dynamics return known evolutionary outcomes. Myopic best response strategy updating, on the other hand, reveals new counterintuitive solutions. Defectors and extortioners coarsen spontaneously, which allows cooperators to prevail even at prohibitively high temptations to defect. Here extortion strategies play the role of a Trojan horse. They may emerge among defectors by chance, and once they do, cooperators become viable as well. These results are independent of the interaction topology, and they highlight the importance of coarsening, checkerboard ordering, and best response updating in evolutionary games.
[ { "created": "Fri, 31 Jan 2014 20:55:56 GMT", "version": "v1" } ]
2014-02-17
[ [ "Szolnoki", "Attila", "" ], [ "Perc", "Matjaz", "" ] ]
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1402.0009
Mark McClelland Dr
Mark McClelland, Tara Estlin, Mark Campbell
Qualitative Relational Mapping and Navigation for Planetary Rovers
null
null
null
null
cs.RO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper presents a novel method for qualitative mapping of large scale spaces. The proposed framework makes use of a graphical representation of the world in order to build a map consisting of qualitative constraints on the geometric relationships between landmark triplets. A novel measurement method based on camera imagery is presented which extends previous work from the field of Qualitative Spatial Reasoning. Measurements are fused into the map using a deterministic, iterative graph update. A Branch-and-Bound approach is taken to solve a set of non-convex feasibility problems required for generating on-line measurements and off-line operator lookup tables. A navigation approach for travel between distant landmarks is developed, using estimates of the Relative Neighborhood Graph extracted from the qualitative map in order to generate a sequence of landmark objectives based on proximity. Average and asymptotic performance of the mapping algorithm is evaluated using Monte Carlo tests on randomly generated maps, and data-driven simulation results are presented for a robot traversing the Jet Propulsion Laboratory Mars Yard while building a relational map. Simulation results demonstrate an initial rapid convergence of qualitative state estimates for visible landmarks, followed by a slow tapering as the remaining ambiguous states are removed from the map.
[ { "created": "Fri, 31 Jan 2014 21:20:39 GMT", "version": "v1" } ]
2014-02-04
[ [ "McClelland", "Mark", "" ], [ "Estlin", "Tara", "" ], [ "Campbell", "Mark", "" ] ]
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1402.0010
Matthew Kunz
Matthew W. Kunz, Alexander A. Schekochihin, James M. Stone
Firehose and Mirror Instabilities in a Collisionless Shearing Plasma
5 pages, 8 figures, accepted for publication in Physical Review Letters
null
10.1103/PhysRevLett.112.205003
null
astro-ph.HE physics.plasm-ph physics.space-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Hybrid-kinetic numerical simulations of firehose and mirror instabilities in a collisionless plasma are performed in which pressure anisotropy is driven as the magnetic field is changed by a persistent linear shear $S$. For a decreasing field, it is found that mostly oblique firehose fluctuations grow at ion Larmor scales and saturate with energies $\sim$$S^{1/2}$; the pressure anisotropy is pinned at the stability threshold by particle scattering off microscale fluctuations. In contrast, nonlinear mirror fluctuations are large compared to the ion Larmor scale and grow secularly in time; marginality is maintained by an increasing population of resonant particles trapped in magnetic mirrors. After one shear time, saturated order-unity magnetic mirrors are formed and particles scatter off their sharp edges. Both instabilities drive sub-ion-Larmor--scale fluctuations, which appear to be kinetic-Alfv\'{e}n-wave turbulence. Our results impact theories of momentum and heat transport in astrophysical and space plasmas, in which the stretching of a magnetic field by shear is a generic process.
[ { "created": "Fri, 31 Jan 2014 21:28:23 GMT", "version": "v1" }, { "created": "Fri, 2 May 2014 00:50:25 GMT", "version": "v2" } ]
2015-06-18
[ [ "Kunz", "Matthew W.", "" ], [ "Schekochihin", "Alexander A.", "" ], [ "Stone", "James M.", "" ] ]
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1402.0012
Stephen Wiggins
F. A. L. Maugui\`ere, P. Collins, G. S. Ezra, S. C. Farantos, S. Wiggins
Roaming dynamics in ion-molecule reactions: phase space reaction pathways and geometrical interpretation
44 pages, 14 figures
null
10.1063/1.4870060
null
physics.chem-ph cond-mat.stat-mech math.DS nlin.CD
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A model Hamiltonian for the reaction CH$_4^+ \rightarrow$ CH$_3^+$ + H, parametrized to exhibit either early or late inner transition states, is employed to investigate the dynamical characteristics of the roaming mechanism. Tight/loose transition states and conventional/roaming reaction pathways are identified in terms of time-invariant objects in phase space. These are dividing surfaces associated with normally hyperbolic invariant manifolds (NHIMs). For systems with two degrees of freedom NHIMS are unstable periodic orbits which, in conjunction with their stable and unstable manifolds, unambiguously define the (locally) non-recrossing dividing surfaces assumed in statistical theories of reaction rates. By constructing periodic orbit continuation/bifurcation diagrams for two values of the potential function parameter corresponding to late and early transition states, respectively, and using the total energy as another parameter, we dynamically assign different regions of phase space to reactants and products as well as to conventional and roaming reaction pathways. The classical dynamics of the system are investigated by uniformly sampling trajectory initial conditions on the dividing surfaces. Trajectories are classified into four different categories: direct reactive and non reactive trajectories,which lead to the formation of molecular and radical products respectively, and roaming reactive and non reactive orbiting trajectories, which represent alternative pathways to form molecular and radical products. By analysing gap time distributions at several energies we demonstrate that the phase space structure of the roaming region, which is strongly influenced by non-linear resonances between the two degrees of freedom, results in nonexponential (nonstatistical) decay.
[ { "created": "Fri, 31 Jan 2014 21:29:33 GMT", "version": "v1" } ]
2015-06-18
[ [ "Mauguière", "F. A. L.", "" ], [ "Collins", "P.", "" ], [ "Ezra", "G. S.", "" ], [ "Farantos", "S. C.", "" ], [ "Wiggins", "S.", "" ] ]
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1402.0013
Yeon-sup Lim
Yeon-sup Lim, Bruno Ribeiro, Don Towsley
Classifying Latent Infection States in Complex Networks
null
null
null
null
cs.SI physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Algorithms for identifying the infection states of nodes in a network are crucial for understanding and containing infections. Often, however, only a relatively small set of nodes have a known infection state. Moreover, the length of time that each node has been infected is also unknown. This missing data -- infection state of most nodes and infection time of the unobserved infected nodes -- poses a challenge to the study of real-world cascades. In this work, we develop techniques to identify the latent infected nodes in the presence of missing infection time-and-state data. Based on the likely epidemic paths predicted by the simple susceptible-infected epidemic model, we propose a measure (Infection Betweenness) for uncovering these unknown infection states. Our experimental results using machine learning algorithms show that Infection Betweenness is the most effective feature for identifying latent infected nodes.
[ { "created": "Fri, 31 Jan 2014 21:39:36 GMT", "version": "v1" } ]
2014-02-04
[ [ "Lim", "Yeon-sup", "" ], [ "Ribeiro", "Bruno", "" ], [ "Towsley", "Don", "" ] ]
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1402.0014
Mario Riquelme
Mario Riquelme, Eliot Quataert, and Daniel Verscharen
PIC Simulations of Continuously Driven Mirror and Ion Cyclotron Instabilities in High Beta Astrophysical and Heliospheric Plasmas
16 pages, 15 figures
null
10.1088/0004-637X/800/1/27
null
astro-ph.HE physics.plasm-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We use particle-in-cell (PIC) simulations to study the nonlinear evolution of ion velocity space instabilities in an idealized problem in which a background velocity shear continuously amplifies the magnetic field. We simulate the astrophysically relevant regime where the shear timescale is long compared to the ion cyclotron period, and the plasma beta is ~ 1-100. The background field amplification in our calculation is meant to mimic processes such as turbulent fluctuations or MHD-scale instabilities. The field amplification continuously drives a pressure anisotropy with the perpendicular pressure larger than the parallel pressure, and the plasma becomes unstable to the mirror and ion cyclotron instabilities. In all cases, the nonlinear state is dominated by the mirror instability, not the ion cyclotron instability, and the plasma pressure anisotropy saturates near the threshold for the linear mirror instability. The magnetic field fluctuations initially undergo exponential growth but saturate in a secular phase in which the fluctuations grow on the same timescale as the background magnetic field (with \delta B ~ 0.3 <B> in the secular phase). At early times, the ion magnetic moment is well-conserved but once the fluctuation amplitudes exceed \delta B ~ 0.1 <B>, the magnetic moment is no longer conserved but instead changes on a timescale comparable to that of the mean magnetic field. We discuss the implications of our results for low-collisionality astrophysical plasmas, including the near-Earth solar wind and low-luminosity accretion disks around black holes.
[ { "created": "Fri, 31 Jan 2014 21:43:33 GMT", "version": "v1" }, { "created": "Sat, 10 Jan 2015 08:04:41 GMT", "version": "v2" } ]
2015-06-18
[ [ "Riquelme", "Mario", "" ], [ "Quataert", "Eliot", "" ], [ "Verscharen", "Daniel", "" ] ]
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1402.0017
Christos Kourtellaris
Christos K. Kourtellaris, Charalambos D. Charalambous
Capacity of Binary State Symmetric Channel with and without Feedback and Transmission Cost
null
null
10.1109/ITW.2015.7133133
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider a unit memory channel, called Binary State Symmetric Channel (BSSC), in which the channel state is the modulo2 addition of the current channel input and the previous channel output. We derive closed form expressions for the capacity and corresponding channel input distribution, of this BSSC with and without feedback and transmission cost. We also show that the capacity of the BSSC is not increased by feedback, and it is achieved by a first order symmetric Markov process.
[ { "created": "Fri, 31 Jan 2014 22:03:28 GMT", "version": "v1" }, { "created": "Sun, 15 Feb 2015 19:32:48 GMT", "version": "v2" } ]
2015-07-03
[ [ "Kourtellaris", "Christos K.", "" ], [ "Charalambous", "Charalambos D.", "" ] ]
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1402.0018
Hao Shi
Hao Shi, Carlos A. Jim\'enez-Hoyos, R. Rodr\'iguez-Guzm\'an, Gustavo E. Scuseria and Shiwei Zhang
Symmetry-projected Wave Functions in Quantum Monte Carlo Calculations
9 pages, 5 figures
PhysRevB.89.125129(2014)
10.1103/PhysRevB.89.125129
null
cond-mat.str-el physics.comp-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider symmetry-projected Hartree--Fock trial wave functions in constrained-path Monte Carlo (CPMC) calculations. Previous CPMC calculations have mostly employed Hartree--Fock (HF) trial wave functions, restricted or unrestricted. The symmetry-projected HF approach results in a hierarchy of wave functions with increasing quality: the more symmetries that are broken and restored in a self-consistent manner, the higher the quality of the trial wave function. This hierarchy is approximately maintained in CPMC calculations: the accuracy in the energy increases and the statistical variance decreases when further symmetries are broken and restored. Significant improvement is achieved in CPMC with the best symmetry-projected trial wave functions over those from simple HF. We analyze and quantify the behavior using the two-dimensional repulsive Hubbard model as an example. In the sign-problem-free region, where CPMC can be made exact but a constraint is deliberately imposed here, spin-projected wave functions remove the constraint bias. Away from half-filling, spatial symmetry restoration in addition to that of the spin lead to highly accurate results from CPMC. Since the computational cost of symmetry-projected HF trial wave functions in CPMC can be made to scale algebraically with system size, this provides a potentially general approach for accurate calculations in many-fermion systems.
[ { "created": "Fri, 31 Jan 2014 22:05:17 GMT", "version": "v1" } ]
2015-03-19
[ [ "Shi", "Hao", "" ], [ "Jiménez-Hoyos", "Carlos A.", "" ], [ "Rodríguez-Guzmán", "R.", "" ], [ "Scuseria", "Gustavo E.", "" ], [ "Zhang", "Shiwei", "" ] ]
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1402.0024
Oliver Schaudt
Van Bang Le and Andrea Oversberg and Oliver Schaudt
Polynomial time recognition of squares of ptolemaic graphs and 3-sun-free split graphs
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cs.DM math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The square of a graph $G$, denoted $G^2$, is obtained from $G$ by putting an edge between two distinct vertices whenever their distance is two. Then $G$ is called a square root of $G^2$. Deciding whether a given graph has a square root is known to be NP-complete, even if the root is required to be a chordal graph or even a split graph. We present a polynomial time algorithm that decides whether a given graph has a ptolemaic square root. If such a root exists, our algorithm computes one with a minimum number of edges. In the second part of our paper, we give a characterization of the graphs that admit a 3-sun-free split square root. This characterization yields a polynomial time algorithm to decide whether a given graph has such a root, and if so, to compute one.
[ { "created": "Fri, 31 Jan 2014 22:40:31 GMT", "version": "v1" } ]
2014-02-04
[ [ "Le", "Van Bang", "" ], [ "Oversberg", "Andrea", "" ], [ "Schaudt", "Oliver", "" ] ]
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1402.0028
Robert Hovden
Robert Hovden, Peter Ercius, Yi Jiang, Deli Wang, Yingchao Yu, Hector D. Abruna, Veit Elser, David A. Muller
Breaking the Crowther Limit: Combining Depth-Sectioning and Tilt Tomography for High-Resolution, Wide-Field 3D Reconstructions
null
null
10.1016/j.ultramic.2014.01.013
null
cond-mat.mtrl-sci physics.ins-det
http://creativecommons.org/licenses/by-nc-sa/3.0/
To date, high-resolution (< 1 nm) imaging of extended objects in three-dimensions (3D) has not been possible. A restriction known as the Crowther criterion forces a tradeoff between object size and resolution for 3D reconstructions by tomography. Further, the sub-Angstrom resolution of aberration-corrected electron microscopes is accompanied by a greatly diminished depth of field, causing regions of larger specimens (> 6 nm) to appear blurred or missing. Here we demonstrate a three-dimensional imaging method that overcomes both these limits by combining through-focal depth sectioning and traditional tilt-series tomography to reconstruct extended objects, with high-resolution, in all three dimensions. The large convergence angle in aberration corrected instruments now becomes a benefit and not a hindrance to higher quality reconstructions. A through-focal reconstruction over a 390 nm 3D carbon support containing over one hundred dealloyed and nanoporous PtCu catalyst particles revealed with sub-nanometer detail the extensive and connected interior pore structure that is created by the dealloying instability.
[ { "created": "Fri, 31 Jan 2014 23:06:03 GMT", "version": "v1" } ]
2014-11-20
[ [ "Hovden", "Robert", "" ], [ "Ercius", "Peter", "" ], [ "Jiang", "Yi", "" ], [ "Wang", "Deli", "" ], [ "Yu", "Yingchao", "" ], [ "Abruna", "Hector D.", "" ], [ "Elser", "Veit", "" ], [ "Muller", "David A.", "" ] ]
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1402.0029
Paulette Acheson
Paulette Acheson, Cihan Dagli, and Nil Kilicay-Ergin
Fuzzy Decision Analysis in Negotiation between the System of Systems Agent and the System Agent in an Agent-Based Model
5 pages, 5 figures, 2 tables, International Journal of Soft Computing and Software Engineering [JSCSE], Vol. 3, No. 3, 2013
null
10.7321/jscse.v3.n3.7
null
cs.MA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Previous papers have described a computational approach to System of Systems (SoS) development using an Agent-Based Model (ABM). This paper describes the Fuzzy Decision Analysis used in the negotiation between the SoS agent and a System agent in the ABM of an Acknowledged SoS development. An Acknowledged SoS has by definition a limited influence on the development of the individual Systems. The individual Systems have their own priorities, pressures, and agenda which may or may not align with the goals of the SoS. The SoS has some funding and deadlines which can be used to negotiate with the individual System in order to illicit the required capability from that System. The Fuzzy Decision Analysis determines how the SoS agent will adjust the funding and deadlines for each of the Systems in order to achieve the desired SoS architecture quality. The Fuzzy Decision Analysis has inputs of performance, funding, and deadlines as well as weights for each capability. The performance, funding, and deadlines are crisp values which are fuzzified. The fuzzified values are then used with a Fuzzy Inference Engine to get the fuzzy outputs of funding adjustment and deadline adjustment which must then be defuzzified before being passed to the System agent. The first contribution of this paper is the fuzzy decision analysis that represents the negotiation between the SoS agent and the System agent. A second contribution of this paper is the method of implementing the fuzzy decision analysis which provides a generalized fuzzy decision analysis.
[ { "created": "Fri, 31 Jan 2014 23:29:02 GMT", "version": "v1" } ]
2014-02-04
[ [ "Acheson", "Paulette", "" ], [ "Dagli", "Cihan", "" ], [ "Kilicay-Ergin", "Nil", "" ] ]
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1402.0030
Andriy Mnih
Andriy Mnih, Karol Gregor
Neural Variational Inference and Learning in Belief Networks
null
Proceedings of the 31st International Conference on Machine Learning (ICML), JMLR: W&CP volume 32, 2014 pgs 1791-1799
null
null
cs.LG stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Highly expressive directed latent variable models, such as sigmoid belief networks, are difficult to train on large datasets because exact inference in them is intractable and none of the approximate inference methods that have been applied to them scale well. We propose a fast non-iterative approximate inference method that uses a feedforward network to implement efficient exact sampling from the variational posterior. The model and this inference network are trained jointly by maximizing a variational lower bound on the log-likelihood. Although the naive estimator of the inference model gradient is too high-variance to be useful, we make it practical by applying several straightforward model-independent variance reduction techniques. Applying our approach to training sigmoid belief networks and deep autoregressive networks, we show that it outperforms the wake-sleep algorithm on MNIST and achieves state-of-the-art results on the Reuters RCV1 document dataset.
[ { "created": "Fri, 31 Jan 2014 23:33:21 GMT", "version": "v1" }, { "created": "Wed, 4 Jun 2014 17:12:03 GMT", "version": "v2" } ]
2016-06-06
[ [ "Mnih", "Andriy", "" ], [ "Gregor", "Karol", "" ] ]
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Neural Variational Inference and Learning in Belief Networks
http://arxiv.org/abs/1402.0030v2
http://arxiv.org/pdf/1402.0030v2.pdf
https://github.com/tensorflow/models/tree/master/research/rebar
false
false
https://paperswithcode.com/paper/neural-variational-inference-and-learning-in-1
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1402.0033
Marek Zawadowski
Justyna Grudzinska, Marek Zawadowski
Generalized Quantifiers on Dependent Types: A System for Anaphora
40 pages; final version
null
null
null
math.LO cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose a system for the interpretation of anaphoric relationships between unbound pronouns and quantifiers. The main technical contribution of our proposal consists in combining generalized quantifiers with dependent types. Empirically, our system allows a uniform treatment of all types of unbound anaphora, including the notoriously difficult cases such as quantificational subordination, cumulative and branching continuations, and 'donkey anaphora'.
[ { "created": "Fri, 31 Jan 2014 23:51:08 GMT", "version": "v1" }, { "created": "Sun, 31 Jul 2016 19:41:25 GMT", "version": "v2" } ]
2016-08-02
[ [ "Grudzinska", "Justyna", "" ], [ "Zawadowski", "Marek", "" ] ]
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1402.0038
Yiteng Zhang
Yiteng Zhang, Gennady P. Berman and Sabre Kais
Sensitivity and Entanglement in the Avian Chemical Compass
7 pages, 7 figures
null
10.1103/PhysRevE.90.042707
null
physics.bio-ph quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Radical Pair Mechanism can help to explain avian orientation and navigation. Some evidence indicates that the intensity of external magnetic fields plays an important role in avian navigation. In this paper, based on a two-stage strategy, we demonstrate that birds could reasonably detect the directions of geomagnetic fields and gradients of these fields using a yield-based chemical compass that is sensitive enough for navigation. Also, we find that the lifetime of entanglement in this proposed compass is angle-dependent and long enough to allow adequate electron transfer between molecules.
[ { "created": "Sat, 1 Feb 2014 01:19:52 GMT", "version": "v1" } ]
2015-06-18
[ [ "Zhang", "Yiteng", "" ], [ "Berman", "Gennady P.", "" ], [ "Kais", "Sabre", "" ] ]
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1402.0041
Theodore Kolokolnikov
Yuxin Chen, Theodore Kolokolnikov and Daniel Zhirov
Collective behaviour of large number of vortices in the plane
null
Proceedings of the Royal Society A (2013), 469:20130085
null
null
cond-mat.quant-gas math.AP math.DS nlin.PS physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We investigate the dynamics of $N$ point vortices in the plane, in the limit of large $N$. We consider {\em relative equilibria}, which are rigidly rotating lattice-like configurations of vortices. These configurations were observed in several recent experiments [Durkin and Fajans, Phys. Fluids (2000) 12, 289-293; Grzybowski {\em et.al} PRE (2001)64, 011603]. We show that these solutions and their stability are fully characterized via a related {\em aggregation model} which was recently investigated in the context of biological swarms [Fetecau {\em et.al.}, Nonlinearity (2011) 2681; Bertozzi {\em et.al.}, M3AS (2011)]. By utilizing this connection, we give explicit analytic formulae for many of the configurations that have been observed experimentally. These include configurations of vortices of equal strength; the $N+1$ configurations of $N$ vortices of equal strength and one vortex of much higher strength; and more generally, $N+K$ configurations. We also give examples of configurations that have not been studied experimentally, including $N+2$ configurations where $N$ vortices aggregate inside an ellipse. Finally, we introduce an artificial ``damping'' to the vortex dynamics, in an attempt to explain the phenomenon of crystalization that is often observed in real experiments. The diffusion breaks the conservative structure of vortex dynamics so that any initial conditions converge to the lattice-like relative equilibrium.
[ { "created": "Sat, 1 Feb 2014 01:48:59 GMT", "version": "v1" } ]
2014-02-04
[ [ "Chen", "Yuxin", "" ], [ "Kolokolnikov", "Theodore", "" ], [ "Zhirov", "Daniel", "" ] ]
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1402.0043
Steven Ross
Steven Ross
Recent Progress on D$^3$ -- The Directional Dark Matter Detector
9 Pages. To appear in the proceedings of The 10th International Symposium on Cosmology and Particle Astrophysics (CosPA2013)
null
null
null
physics.ins-det astro-ph.IM hep-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Direction-sensitive WIMP dark matter searches may help overcome the challenges faced by direct dark matter detection experiments. In particular, directional detectors should be able to clearly differentiate a dark matter signal from background sources. We are developing a Directional Dark Matter Detector (D$^3$) based on a gas Time Projection Chamber (TPC) using Gas Electron Multipliers (GEMs) for charge amplification and pixel electronics for readout. This approach allows the three-dimensional reconstruction of nuclear recoils in a room-temperature detector with low energy threshold and low noise. We present an overview of our past and ongoing work developing this technology, including the performance measurements of small prototypes, as well as our planned future work constructing a m$^3$-scale detector to clearly determine whether the signals seen by DAMA, CoGeNT, and CRESST-II are due to low-mass WIMPs or background.
[ { "created": "Sat, 1 Feb 2014 02:14:10 GMT", "version": "v1" } ]
2014-02-04
[ [ "Ross", "Steven", "" ] ]
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1402.0049
Yi-Kai Liu
Yi-Kai Liu
Single-shot security for one-time memories in the isolated qubits model
v2: to appear in CRYPTO 2014. 21 pages, 3 figures
CRYPTO 2014, Part II, Lecture Notes in Computer Science Volume 8617, pp.19-36 (2014)
10.1007/978-3-662-44381-1_2
null
quant-ph cs.CR cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
One-time memories (OTM's) are simple, tamper-resistant cryptographic devices, which can be used to implement sophisticated functionalities such as one-time programs. Can one construct OTM's whose security follows from some physical principle? This is not possible in a fully-classical world, or in a fully-quantum world, but there is evidence that OTM's can be built using "isolated qubits" -- qubits that cannot be entangled, but can be accessed using adaptive sequences of single-qubit measurements. Here we present new constructions for OTM's using isolated qubits, which improve on previous work in several respects: they achieve a stronger "single-shot" security guarantee, which is stated in terms of the (smoothed) min-entropy; they are proven secure against adversaries who can perform arbitrary local operations and classical communication (LOCC); and they are efficiently implementable. These results use Wiesner's idea of conjugate coding, combined with error-correcting codes that approach the capacity of the q-ary symmetric channel, and a high-order entropic uncertainty relation, which was originally developed for cryptography in the bounded quantum storage model.
[ { "created": "Sat, 1 Feb 2014 03:35:34 GMT", "version": "v1" }, { "created": "Sat, 14 Jun 2014 00:08:06 GMT", "version": "v2" } ]
2014-10-16
[ [ "Liu", "Yi-Kai", "" ] ]
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1402.0050
Yuxi Fu
Qiang Yin, Yuxi Fu, Chaodong He, Mingzhang Huang and Xiuting Tao
Branching Bisimilarity Checking for PRS
18 pages, 6 Figures
null
null
null
cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Recent studies reveal that branching bisimilarity is decidable for both nBPP (normed Basic Parallel Process) and nBPA (normed Basic Process Algebra). These results lead to the question if there are any other models in the hierarchy of PRS (Process Rewrite System) whose branching bisimilarity is decidable. It is shown in this paper that the branching bisimilarity for both nOCN (normed One Counter Net) and nPA (normed Process Algebra) is undecidable. These results essentially imply that the question has a negative answer.
[ { "created": "Sat, 1 Feb 2014 03:39:14 GMT", "version": "v1" }, { "created": "Fri, 14 Feb 2014 13:02:04 GMT", "version": "v2" }, { "created": "Mon, 28 Apr 2014 14:20:41 GMT", "version": "v3" } ]
2014-04-29
[ [ "Yin", "Qiang", "" ], [ "Fu", "Yuxi", "" ], [ "He", "Chaodong", "" ], [ "Huang", "Mingzhang", "" ], [ "Tao", "Xiuting", "" ] ]
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1402.0051
Nikolay Atanasov
Nikolay A. Atanasov and Jerome Le Ny and George J. Pappas
Distributed Algorithms for Stochastic Source Seeking with Mobile Robot Networks: Technical Report
13 pages (two-column); 3 figures; Manuscript submitted to the ASME Journal on Dynamic Systems, Measurement and Control (JDSMC); In version 2 typos in the text were corrected, the proofs were cleaned up, hyperlinks were added to the bibliography, several clarifications were added to the text, and some statements were made more precise
null
null
null
cs.MA cs.RO cs.SY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Autonomous robot networks are an effective tool for monitoring large-scale environmental fields. This paper proposes distributed control strategies for localizing the source of a noisy signal, which could represent a physical quantity of interest such as magnetic force, heat, radio signal, or chemical concentration. We develop algorithms specific to two scenarios: one in which the sensors have a precise model of the signal formation process and one in which a signal model is not available. In the model-free scenario, a team of sensors is used to follow a stochastic gradient of the signal field. Our approach is distributed, robust to deformations in the group geometry, does not necessitate global localization, and is guaranteed to lead the sensors to a neighborhood of a local maximum of the field. In the model-based scenario, the sensors follow the stochastic gradient of the mutual information between their expected measurements and the location of the source in a distributed manner. The performance is demonstrated in simulation using a robot sensor network to localize the source of a wireless radio signal.
[ { "created": "Sat, 1 Feb 2014 04:11:38 GMT", "version": "v1" }, { "created": "Fri, 11 Apr 2014 03:46:29 GMT", "version": "v2" } ]
2014-04-14
[ [ "Atanasov", "Nikolay A.", "" ], [ "Ny", "Jerome Le", "" ], [ "Pappas", "George J.", "" ] ]
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1402.0052
David Gamarnik
David Gamarnik, Madhu Sudan
Performance of the Survey Propagation-guided decimation algorithm for the random NAE-K-SAT problem
25 pages
null
null
null
math.PR cond-mat.stat-mech cs.AI cs.CC cs.DS math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We show that the Survey Propagation-guided decimation algorithm fails to find satisfying assignments on random instances of the "Not-All-Equal-$K$-SAT" problem if the number of message passing iterations is bounded by a constant independent of the size of the instance and the clause-to-variable ratio is above $(1+o_K(1)){2^{K-1}\over K}\log^2 K$ for sufficiently large $K$. Our analysis in fact applies to a broad class of algorithms described as "sequential local algorithms". Such algorithms iteratively set variables based on some local information and then recurse on the reduced instance. Survey Propagation-guided as well as Belief Propagation-guided decimation algorithms - two widely studied message passing based algorithms, fall under this category of algorithms provided the number of message passing iterations is bounded by a constant. Another well-known algorithm falling into this category is the Unit Clause algorithm. Our work constitutes the first rigorous analysis of the performance of the SP-guided decimation algorithm. The approach underlying our paper is based on an intricate geometry of the solution space of random NAE-$K$-SAT problem. We show that above the $(1+o_K(1)){2^{K-1}\over K}\log^2 K$ threshold, the overlap structure of $m$-tuples of satisfying assignments exhibit a certain clustering behavior expressed in the form of constraints on distances between the $m$ assignments, for appropriately chosen $m$. We further show that if a sequential local algorithm succeeds in finding a satisfying assignment with probability bounded away from zero, then one can construct an $m$-tuple of solutions violating these constraints, thus leading to a contradiction. Along with (citation), this result is the first work which directly links the clustering property of random constraint satisfaction problems to the computational hardness of finding satisfying assignments.
[ { "created": "Sat, 1 Feb 2014 05:05:12 GMT", "version": "v1" }, { "created": "Tue, 30 Sep 2014 02:07:36 GMT", "version": "v2" } ]
2014-10-01
[ [ "Gamarnik", "David", "" ], [ "Sudan", "Madhu", "" ] ]
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1402.0054
Amir Abboud
Amir Abboud and Virginia Vassilevska Williams
Popular conjectures imply strong lower bounds for dynamic problems
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null
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cs.DS cs.CC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider several well-studied problems in dynamic algorithms and prove that sufficient progress on any of them would imply a breakthrough on one of five major open problems in the theory of algorithms: 1. Is the 3SUM problem on $n$ numbers in $O(n^{2-\epsilon})$ time for some $\epsilon>0$? 2. Can one determine the satisfiability of a CNF formula on $n$ variables in $O((2-\epsilon)^n poly n)$ time for some $\epsilon>0$? 3. Is the All Pairs Shortest Paths problem for graphs on $n$ vertices in $O(n^{3-\epsilon})$ time for some $\epsilon>0$? 4. Is there a linear time algorithm that detects whether a given graph contains a triangle? 5. Is there an $O(n^{3-\epsilon})$ time combinatorial algorithm for $n\times n$ Boolean matrix multiplication? The problems we consider include dynamic versions of bipartite perfect matching, bipartite maximum weight matching, single source reachability, single source shortest paths, strong connectivity, subgraph connectivity, diameter approximation and some nongraph problems such as Pagh's problem defined in a recent paper by Patrascu [STOC 2010].
[ { "created": "Sat, 1 Feb 2014 06:20:09 GMT", "version": "v1" } ]
2014-02-04
[ [ "Abboud", "Amir", "" ], [ "Williams", "Virginia Vassilevska", "" ] ]
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1402.0058
Martin Z. Bazant
Daosheng Deng, Wassim Aouad, William A. Braff, Sven Schlumpberger, Matthew E. Suss, and Martin Z. Bazant
Water Purification by Shock Electrodialysis: Deionization, Filtration, Separation, and Disinfection
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null
null
physics.chem-ph cond-mat.soft
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The development of energy and infrastructure efficient water purification systems are among the most critical engineering challenges facing our society. Water purification is often a multi-step process involving filtration, desalination, and disinfection of a feedstream. Shock electrodialysis (shock ED) is a newly developed technique for water desalination, leveraging the formation of ion concentration polarization (ICP) zones and deionization shock waves in microscale pores near to an ion selective element. While shock ED has been demonstrated as an effective water desalination tool, we here present evidence of other simultaneous functionalities. We show that, unlike electrodialysis, shock ED can thoroughly filter micron-scale particles and aggregates of nanoparticles present in the feedwater. We also demonstrate that shock ED can enable disinfection of feedwaters, as approximately $99\%$ of viable bacteria (here \textit{E. coli}) in the inflow were killed or removed by our prototype. Shock ED also separates positive from negative particles, contrary to claims that ICP acts as a virtual barrier for all charged particles. By combining these functionalities (filtration, separation and disinfection) with deionization, shock ED has the potential to enable more compact and efficient water purification systems.
[ { "created": "Sat, 1 Feb 2014 07:13:19 GMT", "version": "v1" } ]
2014-02-04
[ [ "Deng", "Daosheng", "" ], [ "Aouad", "Wassim", "" ], [ "Braff", "William A.", "" ], [ "Schlumpberger", "Sven", "" ], [ "Suss", "Matthew E.", "" ], [ "Bazant", "Martin Z.", "" ] ]
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1402.0060
Xue Luo
Xue Luo, Stephen S.-T. Yau, Mingyi Zhang and Huaiqing Zuo
On Classification of Toric Surface Codes of Low Dimension
18 pages, 4 figures, 8 tables
Finite Fields Appl., Vol. 33, pp. 90-102, 2015
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cs.IT math.CO math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This work is a natural continuation of our previous work \cite{yz}. In this paper, we give a complete classification of toric surface codes of dimension less than or equal to 6, except a special pair, $C_{P_6^{(4)}}$ and $C_{P_6^{(5)}}$ over $\mathbb{F}_8$. Also, we give an example, $C_{P_6^{(5)}}$ and $C_{P_6^{(6)}}$ over $\mathbb{F}_7$, to illustrate that two monomially equivalent toric codes can be constructed from two lattice non-equivalent polygons.
[ { "created": "Sat, 1 Feb 2014 07:39:37 GMT", "version": "v1" }, { "created": "Sun, 14 Sep 2014 02:55:55 GMT", "version": "v2" } ]
2015-08-11
[ [ "Luo", "Xue", "" ], [ "Yau", "Stephen S. -T.", "" ], [ "Zhang", "Mingyi", "" ], [ "Zuo", "Huaiqing", "" ] ]
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1402.0062
Gowtham Ramani Kumar
Gowtham Ramani Kumar, Cheuk Ting Li and Abbas El Gamal
Exact Common Information
null
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper introduces the notion of exact common information, which is the minimum description length of the common randomness needed for the exact distributed generation of two correlated random variables $(X,Y)$. We introduce the quantity $G(X;Y)=\min_{X\to W \to Y} H(W)$ as a natural bound on the exact common information and study its properties and computation. We then introduce the exact common information rate, which is the minimum description rate of the common randomness for the exact generation of a 2-DMS $(X,Y)$. We give a multiletter characterization for it as the limit $\bar{G}(X;Y)=\lim_{n\to \infty}(1/n)G(X^n;Y^n)$. While in general $\bar{G}(X;Y)$ is greater than or equal to the Wyner common information, we show that they are equal for the Symmetric Binary Erasure Source. We do not know, however, if the exact common information rate has a single letter characterization in general.
[ { "created": "Sat, 1 Feb 2014 07:50:05 GMT", "version": "v1" } ]
2014-02-04
[ [ "Kumar", "Gowtham Ramani", "" ], [ "Li", "Cheuk Ting", "" ], [ "Gamal", "Abbas El", "" ] ]
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1402.0064
Weihua Deng Professor
Can Li, Weihua Deng
High order schemes for the tempered fractional diffusion equations
23 pages, 3 figures
Advances in Computational Mathematics, 42(3), 543-572, 2016
10.1007/s10444-015-9434-z
null
physics.comp-ph math.NA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
L\'{e}vy flight models whose jumps have infinite moments are mathematically used to describe the superdiffusion in complex systems. Exponentially tempering the Levy measure of L\'{e}vy flights leads to the tempered stable L\'{e}vy processes which combine both the $\alpha$-stable and Gaussian trends; and the very large jumps are unlikely and all their moments exist. The probability density functions of the tempered stable L\'{e}vy processes solve the tempered fractional diffusion equation. This paper focuses on designing the high order difference schemes for the tempered fractional diffusion equation on bounded domain. The high order difference approximations, called the tempered and weighted and shifted Gr\"{u}nwald difference (tempered-WSGD) operators, in space are obtained by using the properties of the tempered fractional calculus and weighting and shifting their first order Gr\"{u}nwald type difference approximations. And the Crank-Nicolson discretization is used in the time direction. The stability and convergence of the presented numerical schemes are established; and the numerical experiments are performed to confirm the theoretical results and testify the effectiveness of the schemes.
[ { "created": "Sat, 1 Feb 2014 08:22:31 GMT", "version": "v1" }, { "created": "Thu, 25 Sep 2014 13:23:13 GMT", "version": "v2" } ]
2016-05-19
[ [ "Li", "Can", "" ], [ "Deng", "Weihua", "" ] ]
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1402.0068
V Karthikeyan VKK
V.Karthikeyan and V.J.Vijayalakshmi
Radiation Pattern of Patch Antenna with Slits
6 pages and 7 figures
null
10.5121/ijit.2014.3101
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Microstrip antenna has been commercially used in many applications, such as direct broadcast satellite service, mobile satellite communications, global positioning system, medical hyperthermia usage, etc. The patch antenna of the size reduction at a given operating frequency is obtained. Mobile personal communication systems and wireless computer networks are most commonly used nowadays and they are in need of antennas in different frequency bands. In regulate to without difficulty incorporate these antennas into individual systems, a micro strip scrap transmitter have been preferred and intended for a convinced divergence. There is also an analysis of radiation pattern, Gain of the antenna, Directivity of the antenna, Electric Far Field. The simulations results are obtained by using electromagnetic simulation software called feko software are presented and discussed
[ { "created": "Sat, 1 Feb 2014 10:01:39 GMT", "version": "v1" } ]
2014-02-04
[ [ "Karthikeyan", "V.", "" ], [ "Vijayalakshmi", "V. J.", "" ] ]
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1402.0079
Sanjeeb Dey S Dey
Sanjeeb Dey
Study of Coherent Perfect Absorption Using Gaussian Beam in a Composite Medium
null
null
null
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
There is a study of coherent perfect absorption (CPA) in composite medium (CM) which is made of metal-dielectric composition. The CM, an orthorhombic shaped slab, is illuminated by two identical Gaussian beams (GB) incident at equal angle of incidence and focused on the two interfaces between wall of slab and air from opposite side. It has determine the necessary conditions required for CPA and shows that perfect CPA is possible with GBs. Author also shows broader beams exhibit more absorption than comparatively tightly focused beams.
[ { "created": "Sat, 1 Feb 2014 11:38:21 GMT", "version": "v1" } ]
2014-02-04
[ [ "Dey", "Sanjeeb", "" ] ]
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1402.0081
Jonathan Heras
J\'onathan Heras and Ekaterina Komendantskaya
Proof Pattern Search in Coq/SSReflect
null
null
null
null
cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
ML4PG is an extension of the Proof General interface, allowing the user to invoke machine-learning algorithms and find proof similarities in Coq/SSReect libraries. In this paper, we present three new improvements to ML4PG. First, a new method of "recurrent clustering" is introduced to collect statistical features from Coq terms. Now the user can receive suggestions about similar definitions, types and lemma statements, in addition to proof strategies. Second, Coq proofs are split into patches to capture proof strategies that could arise at different stages of a proof. Finally, we improve ML4PG's output introducing an automaton-shape representation for proof patterns.
[ { "created": "Sat, 1 Feb 2014 11:52:38 GMT", "version": "v1" } ]
2014-02-04
[ [ "Heras", "Jónathan", "" ], [ "Komendantskaya", "Ekaterina", "" ] ]
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1402.0082
Giovanni Lapenta
Giovanni Lapenta, Martin Goldman, David Newman, Stefano Markidis, Andrey Divin
Electromagnetic Energy Conversion in Downstream Fronts from 3D Kinetic Reconnection
Based on an invited talk presented at the APS-DPP2013 meeting in Denver. To appear on Phys. Plasmas
null
10.1063/1.4872028
null
physics.plasm-ph astro-ph.EP astro-ph.SR physics.space-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The electromagnetic energy equation is analyzed term by term in a 3D simulation of kinetic reconnection previously reported by \citet{vapirev2013formation}. The evolution presents the usual 2D-like topological structures caused by an initial perturbation independent of the third dimension. However, downstream of the reconnection site, where the jetting plasma encounters the yet unperturbed pre-existing plasma, a downstream front (DF) is formed and made unstable by the strong density gradient and the unfavorable local acceleration field. The energy exchange between plasma and fields is most intense at the instability, reaching several $pW/m^3$, alternating between load (energy going from fields to particles) and generator (energy going from particles to fields) regions. Energy exchange is instead purely that of a load at the reconnection site itself in a region focused around the x-line and elongated along the separatrix surfaces. Poynting fluxes are generated at all energy exchange regions and travel away from the reconnection site transporting an energy signal of the order of about $\mathbf S \approx 10^{-3} W/m^2$.
[ { "created": "Sat, 1 Feb 2014 12:02:33 GMT", "version": "v1" } ]
2015-06-18
[ [ "Lapenta", "Giovanni", "" ], [ "Goldman", "Martin", "" ], [ "Newman", "David", "" ], [ "Markidis", "Stefano", "" ], [ "Divin", "Andrey", "" ] ]
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1402.0086
Henry O. Jacobs
C. J. Cotter, D. D. Holm, H. O. Jacobs, and D. M. Meier
A jetlet hierarchy for ideal fluid dynamics
1st revision -- Comments welcome
null
10.1088/1751-8113/47/35/352001
null
physics.flu-dyn math-ph math.MP nlin.PS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Truncated Taylor expansions of smooth flow maps are used in Hamilton's principle to derive a multiscale Lagrangian particle representation of ideal fluid dynamics. Numerical simulations for scattering of solutions at one level of truncation are found to produce solutions at higher levels. These scattering events to higher levels in the Taylor expansion are interpreted as modeling a cascade to smaller scales.
[ { "created": "Sat, 1 Feb 2014 13:46:26 GMT", "version": "v1" }, { "created": "Fri, 25 Apr 2014 22:36:23 GMT", "version": "v2" }, { "created": "Tue, 6 May 2014 19:33:21 GMT", "version": "v3" } ]
2015-06-18
[ [ "Cotter", "C. J.", "" ], [ "Holm", "D. D.", "" ], [ "Jacobs", "H. O.", "" ], [ "Meier", "D. M.", "" ] ]
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1402.0087
Reza Ebrahimi Atani
Mehran Alidoost Nia, Reza Ebrahimi Atani
A novel datatype architecture support for programming languages
This paper is accepted and published in International journal of Programming Languages and applications
International journal of Programming Languages and applications Vol. 4 No.1 2014
10.5121/ijpla
null
cs.PL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In programmers point of view, Datatypes in programming language level have a simple description but inside hardware, huge machine codes are responsible to describe type features. Datatype architecture design is a novel approach to match programming features along with hardware design. In this paper a novel Data type-Based Code Reducer (TYPELINE) architecture is proposed and implemented according to significant data types (SDT) of programming languages. TYPELINE uses TEUs for processing various SDT operations. This architecture design leads to reducing the number of machine codes, and increases execution speed, and also improves some parallelism level. This is because this architecture supports some operation for the execution of Abstract Data Types in parallel. Also it ensures to maintain data type features and entire application level specifications using the proposed type conversion unit. This framework includes compiler level identifying execution modes and memory management unit for decreasing object read/write in heap memory by ISA support. This energy-efficient architecture is completely compatible with object oriented programming languages and in combination mode it can process complex C++ data structures with respect to parallel TYPELINE architecture support.
[ { "created": "Sat, 1 Feb 2014 14:07:59 GMT", "version": "v1" } ]
2014-04-17
[ [ "Nia", "Mehran Alidoost", "" ], [ "Atani", "Reza Ebrahimi", "" ] ]
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1402.0092
Peter Harremo\"es
Peter Harremo\"es
Mutual information of Contingency Tables and Related Inequalities
A version without the appendix has been submitted to a conference
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math.ST cs.IT math.IT stat.TH
http://creativecommons.org/licenses/by/3.0/
For testing independence it is very popular to use either the $\chi^{2}$-statistic or $G^{2}$-statistics (mutual information). Asymptotically both are $\chi^{2}$-distributed so an obvious question is which of the two statistics that has a distribution that is closest to the $\chi^{2}$-distribution. Surprisingly the distribution of mutual information is much better approximated by a $\chi^{2}$-distribution than the $\chi^{2}$-statistic. For technical reasons we shall focus on the simplest case with one degree of freedom. We introduce the signed log-likelihood and demonstrate that its distribution function can be related to the distribution function of a standard Gaussian by inequalities. For the hypergeometric distribution we formulate a general conjecture about how close the signed log-likelihood is to a standard Gaussian, and this conjecture gives much more accurate estimates of the tail probabilities of this type of distribution than previously published results. The conjecture has been proved numerically in all cases relevant for testing independence and further evidence of its validity is given.
[ { "created": "Sat, 1 Feb 2014 15:28:20 GMT", "version": "v1" } ]
2014-02-04
[ [ "Harremoës", "Peter", "" ] ]
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1402.0093
Giovanni Mana
Danilo Quagliotti and Giovanni Mana
Stray capacitances in the watt balance operation: electrostatic forces
13 pages, 10 figures, submitted to Metrologia
null
10.1088/0026-1394/51/2/S72
null
physics.class-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In a watt balance, stray capacitances exist between the coil and the magnet. Since the electric current flowing in the coil originates a difference between the coil and magnet electric-potentials, their electrostatic interactions must be taken into account. This paper reports the results of a finite element analysis of the forces acting on the coil.
[ { "created": "Sat, 1 Feb 2014 15:35:42 GMT", "version": "v1" } ]
2015-06-18
[ [ "Quagliotti", "Danilo", "" ], [ "Mana", "Giovanni", "" ] ]
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