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1402.4238
Shixin Luo
Shixin Luo, Rui Zhang, Teng Joon Lim
Downlink and Uplink Energy Minimization Through User Association and Beamforming in Cloud RAN
29 pages, 4 figures, submitted for possible journal publication
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The cloud radio access network (C-RAN) concept, in which densely deployed access points (APs) are empowered by cloud computing to cooperatively support mobile users (MUs), to improve mobile data rates, has been recently proposed. However, the high density of active ("on") APs results in severe interference and also inefficient energy consumption. Moreover, the growing popularity of highly interactive applications with stringent uplink (UL) requirements, e.g. network gaming and real-time broadcasting by wireless users, means that the UL transmission is becoming more crucial and requires special attention. Therefore in this paper, we propose a joint downlink (DL) and UL MU-AP association and beamforming design to coordinate interference in the C-RAN for energy minimization, a problem which is shown to be NP hard. Due to the new consideration of UL transmission, it is shown that the two state-of-the-art approaches for finding computationally efficient solutions of joint MU-AP association and beamforming considering only the DL, i.e., group-sparse optimization and relaxed-integer programming, cannot be modified in a straightforward way to solve our problem. Leveraging on the celebrated UL-DL duality result, we show that by establishing a virtual DL transmission for the original UL transmission, the joint DL and UL optimization problem can be converted to an equivalent DL problem in C-RAN with two inter-related subproblems for the original and virtual DL transmissions, respectively. Based on this transformation, two efficient algorithms for joint DL and UL MU-AP association and beamforming design are proposed, whose performances are evaluated and compared with other benchmarking schemes through extensive simulations.
[ { "created": "Tue, 18 Feb 2014 07:17:39 GMT", "version": "v1" }, { "created": "Mon, 23 Jun 2014 02:14:51 GMT", "version": "v2" } ]
2014-06-24
[ [ "Luo", "Shixin", "" ], [ "Zhang", "Rui", "" ], [ "Lim", "Teng Joon", "" ] ]
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1402.4246
Keshava Elliadka
Keshava M Elliadka and Robert Morelos-Zaragoza
Precoding by Priority: A UEP Scheme for RaptorQ Codes
5 Pages, 8 Figures, submitted to ISIT-2014
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Raptor codes are the first class of fountain codes with linear time encoding and decoding. These codes are recommended in standards such as Third Generation Partnership Project (3GPP) and digital video broadcasting. RaptorQ codes are an extension to Raptor codes, having better coding efficiency and flexibility. Standard Raptor and RaptorQ codes are systematic with equal error protection of the data. However, in many applications such as MPEG transmission, there is a need for Unequal Error Protection (UEP): namely, some data symbols require higher error correction capabilities compared to others. We propose an approach that we call Priority Based Precode Ratio (PBPR) to achieve UEP for systematic RaptorQ and Raptor codes. Our UEP assumes that all symbols in a source block belong to the same importance class. The UEP is achieved by changing the number of precode symbols depending on the priority of the information symbols in the source block. PBPR provides UEP with the same number of decoding overhead symbols for source blocks with different importance classes. We demonstrate consistent improvements in the error correction capability of higher importance class compared to the lower importance class across the entire range of channel erasure probabilities. We also show that PBPR does not result in a significant increase in decoding and encoding times compared to the standard implementation.
[ { "created": "Tue, 18 Feb 2014 08:17:42 GMT", "version": "v1" } ]
2014-02-19
[ [ "Elliadka", "Keshava M", "" ], [ "Morelos-Zaragoza", "Robert", "" ] ]
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1402.4247
Jae-Hyeon Parq
Jae-Hyeon Parq, Erik Sevre and Sang-Mook Lee
Effects of Easy Hybrid Parallelization with CUDA for Numerical-Atomic-Orbital Density Functional Theory Calculation
20 pages, 3 figures
International Journal of Computer Applications, Volume 98, No.13, pp. 20-27 (2014)
null
null
cs.DC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We modified a MPI-friendly density functional theory (DFT) source code within hybrid parallelization including CUDA. Our objective is to find out how simple conversions within the hybrid parallelization with mid-range GPUs affect DFT code not originally suitable to CUDA. We settled several rules of hybrid parallelization for numerical-atomic-orbital (NAO) DFT codes. The test was performed on a magnetite material system with OpenMX code by utilizing a hardware system containing 2 Xeon E5606 CPUs and 2 Quadro 4000 GPUs. 3-way hybrid routines obtained a speedup of 7.55 while 2-way hybrid speedup by 10.94. GPUs with CUDA complement the efficiency of OpenMP and compensate CPUs' excessive competition within MPI.
[ { "created": "Tue, 18 Feb 2014 08:25:47 GMT", "version": "v1" } ]
2014-07-23
[ [ "Parq", "Jae-Hyeon", "" ], [ "Sevre", "Erik", "" ], [ "Lee", "Sang-Mook", "" ] ]
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1402.4250
Shun Ogawa
Shun Ogawa and Yoshiyuki Y. Yamaguchi
Nonlinear response for external field and perturbation in the Vlasov system
15 pages, 8 figures, accepted for publication in Phys. Rev. E, Lemma 2 is corrected
Phys. Rev. E 89, 052114 (2014)
10.1103/PhysRevE.89.052114
null
cond-mat.stat-mech physics.plasm-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A nonlinear response theory is provided by use of the transient linearization method in the spatially one-dimensional Vlasov systems. The theory inclusively gives responses to external fields and to perturbations for initial stationary states, and is applicable even to the critical point of a second order phase transition. We apply the theory to the Hamiltonian mean-field model, a toy model of a ferromagnetic body, and investigate the critical exponent associated with the response to the external field at the critical point in particular. The obtained critical exponent is nonclassical value 3/2, while the classical value is 3. However, interestingly, one scaling relation holds with another nonclassical critical exponent of susceptibility in the isolated Vlasov systems. Validity of the theory is numerically confirmed by directly simulating temporal evolutions of the Vlasov equation.
[ { "created": "Tue, 18 Feb 2014 08:44:53 GMT", "version": "v1" }, { "created": "Thu, 3 Apr 2014 05:09:51 GMT", "version": "v2" }, { "created": "Fri, 9 May 2014 07:21:55 GMT", "version": "v3" } ]
2014-05-21
[ [ "Ogawa", "Shun", "" ], [ "Yamaguchi", "Yoshiyuki Y.", "" ] ]
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1402.4254
Raul Borsche
Raul Borsche and Axel Klar
Flooding in urban drainage systems: Coupling hyperbolic conservation laws for sewer systems and surface flow
null
null
10.1002/fld.3957
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we propose a model for a sewer network coupled to surface flow and investigate it numerically. In particular, we present a new model for the manholes in storm sewer systems. It is derived using the balance of the total energy in the complete network. The resulting system of equations contains, aside from hyperbolic conservation laws for the sewer network and algebraic relations for the coupling conditions, a system of ODEs governing the flow in the manholes. The manholes provide natural points for the interaction of the sewer system and the run off on the urban surface modelled by shallow water equations. Finally, a numerical method for the coupled system is presented. In several numerical tests we study the influence of the manhole model on the sewer system and the coupling with 2D surface flow.
[ { "created": "Tue, 18 Feb 2014 09:14:41 GMT", "version": "v1" } ]
2015-06-18
[ [ "Borsche", "Raul", "" ], [ "Klar", "Axel", "" ] ]
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1402.4258
Bino Sebastian v
V. Bino Sebastian, A Unnikrishnan, Kannan Balakrishnan, P. B Ramkumar
Morphological filtering on hypergraphs
null
null
null
null
cs.DM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The focus of this article is to develop computationally efficient mathematical morphology operators on hypergraphs. To this aim we consider lattice structures on hypergraphs on which we build morphological operators. We develop a pair of dual adjunctions between the vertex set and the hyper edge set of a hypergraph H, by defining a vertex-hyperedge correspondence. This allows us to recover the classical notion of a dilation/erosion of a subset of vertices and to extend it to subhypergraphs of H. Afterward, we propose several new openings, closings, granulometries and alternate sequential filters acting (i) on the subsets of the vertex and hyperedge set of H and (ii) on the subhypergraphs of a hypergraph.
[ { "created": "Tue, 18 Feb 2014 09:32:56 GMT", "version": "v1" } ]
2014-02-19
[ [ "Sebastian", "V. Bino", "" ], [ "Unnikrishnan", "A", "" ], [ "Balakrishnan", "Kannan", "" ], [ "Ramkumar", "P. B", "" ] ]
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1402.4259
Amelia Carolina Sparavigna
Roberto Marazzato and Amelia Carolina Sparavigna
Extracting Networks of Characters and Places from Written Works with CHAPLIN
Keywords: Literary experiments, Networks, Graph Visualization Software, Text Data Analysis
null
null
null
cs.CY cs.CL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We are proposing a tool able to gather information on social networks from narrative texts. Its name is CHAPLIN, CHAracters and PLaces Interaction Network, implemented in VB.NET. Characters and places of the narrative works are extracted in a list of raw words. Aided by the interface, the user selects names out of them. After this choice, the tool allows the user to enter some parameters, and, according to them, creates a network where the nodes are the characters and places, and the edges their interactions. Edges are labelled by performances. The output is a GV file, written in the DOT graph scripting language, which is rendered by means of the free open source software Graphviz.
[ { "created": "Tue, 18 Feb 2014 09:35:19 GMT", "version": "v1" } ]
2014-02-20
[ [ "Marazzato", "Roberto", "" ], [ "Sparavigna", "Amelia Carolina", "" ] ]
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1402.4262
Harsh Soni
Nitin Kumar, Harsh Soni, Sriram Ramaswamy and A.K. Sood
Flocking at a distance in active granular matter
32 pages, 14 figures, Supplementary Videos: http://www.tifrh.res.in/tcis/events/sriram_videos/
Nature Communications 5, Article number: 4688 (03 September 2014)
10.1038/ncomms5688
null
cond-mat.soft cond-mat.stat-mech physics.bio-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The self-organised motion of vast numbers of creatures in a single direction is a spectacular example of emergent order. We recreate this phenomenon using actuated non-living components. We report here that millimetre-sized tapered rods, rendered motile by contact with an underlying vibrated surface and interacting through a medium of spherical beads, undergo a phase transition to a state of spontaneous alignment of velocities and orientations above a threshold bead area fraction. Guided by a detailed simulation model, we construct an analytical theory of this flocking transition, with two ingredients: a moving rod drags beads; neighbouring rods reorient in the resulting flow like a weathercock in the wind. Theory and experiment agree on the structure of our phase diagram in the plane of rod and bead concentrations and power-law spatial correlations near the phase boundary. Our discovery suggests possible new mechanisms for the collective transport of particulate or cellular matter.
[ { "created": "Tue, 18 Feb 2014 09:46:11 GMT", "version": "v1" }, { "created": "Mon, 22 Sep 2014 18:00:26 GMT", "version": "v2" } ]
2014-09-23
[ [ "Kumar", "Nitin", "" ], [ "Soni", "Harsh", "" ], [ "Ramaswamy", "Sriram", "" ], [ "Sood", "A. K.", "" ] ]
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1402.4264
Gleb Gennadievich Kozlov
S.V.Poltavtsev, I.I.Ryzhov, R.V.Cherbunin, A.V.Mikhailov, N.E.Kopteva, G.G.Kozlov, K.V.Kavokin, V.S.Zapasskii
Optics of spin-noise-induced gyrotropy of asymmetric microcavity
6 pages, 5 figures
null
10.1103/PhysRevB.89.205308
null
cond-mat.mes-hall physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The optical gyrotropy noise of a high-finesse semiconductor Bragg microcavity with an embedded quantum well (QW) is studied at different detunings of the photon mode and the QW exciton resonances. A strong suppression of the noise magnitude for the photon mode frequencies lying above exciton resonances is found. We show that such a critical behavior of the observed optical noise power is specific of asymmetric Fabry-Perot resonators. As follows from our analysis, at a certain level of intracavity loss, the reflectivity of the asymmetric resonator vanishes, while the polarimetric sensitivity to the gyrotropy changes dramatically when moving across the critical point. The results of model calculations are in a good agreement with our experimental data on the spin noise in a single-quantum-well microcavity and are confirmed also by the spectra of the photo-induced Kerr rotation in the pump-probe experiments.
[ { "created": "Tue, 18 Feb 2014 09:48:56 GMT", "version": "v1" } ]
2015-06-18
[ [ "Poltavtsev", "S. V.", "" ], [ "Ryzhov", "I. I.", "" ], [ "Cherbunin", "R. V.", "" ], [ "Mikhailov", "A. V.", "" ], [ "Kopteva", "N. E.", "" ], [ "Kozlov", "G. G.", "" ], [ "Kavokin", "K. V.", "" ], [ "Zapasskii", "V. S.", "" ] ]
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1402.4275
Davide Faranda
Davide Faranda, Mickael Bourgoin, Sophie Miralles, Philippe Odier, Jean-Francois Pinton, Nicolas Plihon, Fran\c{c}ois Daviaud and B\'ereng\`ere Dubrulle
Robust estimate of dynamo thresholds in the von K\'arm\'an sodium experiment using the Extreme Value Theory
10 pages, 7 figures
null
10.1088/1367-2630/16/8/083001
null
physics.flu-dyn physics.data-an
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We apply a new threshold detection method based on the extreme value theory to the von K\'arm\'an sodium (VKS) experiment data. The VKS experiment is a successful attempt to get a dynamo magnetic field in a laboratory liquid-metal experiment. We first show that the dynamo threshold is associated to a change of the probability density function of the extreme values of the magnetic field. This method does not require the measurement of response functions from applied external perturbations, and thus provides a simple threshold estimate. We apply our method to different configurations in the VKS experiment showing that it yields a robust indication of the dynamo threshold as well as evidence of hysteretic behaviors. Moreover, for the experimental configurations in which a dynamo transition is not observed, the method provides a way to extrapolate an interval of possible threshold values.
[ { "created": "Tue, 18 Feb 2014 10:26:53 GMT", "version": "v1" } ]
2015-06-18
[ [ "Faranda", "Davide", "" ], [ "Bourgoin", "Mickael", "" ], [ "Miralles", "Sophie", "" ], [ "Odier", "Philippe", "" ], [ "Pinton", "Jean-Francois", "" ], [ "Plihon", "Nicolas", "" ], [ "Daviaud", "François", "" ], [ "Dubrulle", "Bérengère", "" ] ]
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1402.4279
Ingmar Schuster
Ingmar Schuster
A Bayesian Model of node interaction in networks
null
null
null
null
cs.LG stat.ME stat.ML
http://creativecommons.org/licenses/by-nc-sa/3.0/
We are concerned with modeling the strength of links in networks by taking into account how often those links are used. Link usage is a strong indicator of how closely two nodes are related, but existing network models in Bayesian Statistics and Machine Learning are able to predict only wether a link exists at all. As priors for latent attributes of network nodes we explore the Chinese Restaurant Process (CRP) and a multivariate Gaussian with fixed dimensionality. The model is applied to a social network dataset and a word coocurrence dataset.
[ { "created": "Tue, 18 Feb 2014 10:34:41 GMT", "version": "v1" }, { "created": "Fri, 6 Mar 2015 10:22:12 GMT", "version": "v2" } ]
2015-03-09
[ [ "Schuster", "Ingmar", "" ] ]
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1402.4280
J\"urgen M\"unch
Alejandro Fern\'andez, Badie Garzaldeen, Ines Gr\"utzner, J\"urgen M\"unch
Guided Support for Collaborative Modeling, Enactment and Simulation of Software Development Processes
8 pages. The final publication is available at http://onlinelibrary.wiley.com/doi/10.1002/spip.199/abstract
International Journal on Software Process: Improvement and Practice, 9(2):95-106, 2004
10.1002/spip.199
null
cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Recently, the awareness of the importance of distributed software development has been growing in the software engineering community. Economic constraints, more and more outsourcing of development activities, and the increasing spatial distribution of companies come along with challenges of how to organize distributed development. In this article, we reason that a common process understanding is mandatory for successful distributed development. Integrated process planning, guidance and enactment are seen as enabling technologies to reach a unique process view. We sketch a synthesis of the software process modeling environment SPEARMINT and the XCHIPS system for web-based process support. Hereby, planners and developers are provided with collaborative planning and enactment support and advanced process guidance via electronic process guides (EPGs). We describe the usage of this integrated environment by using a case study for the development of a learning system.
[ { "created": "Tue, 18 Feb 2014 10:36:02 GMT", "version": "v1" } ]
2014-02-19
[ [ "Fernández", "Alejandro", "" ], [ "Garzaldeen", "Badie", "" ], [ "Grützner", "Ines", "" ], [ "Münch", "Jürgen", "" ] ]
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1402.4283
Dipti Rana Mrs.
P. Chaudhari, D. P. Rana, R. G. Mehta, N. J. Mistry, M. M. Raghuwanshi
Discretization of Temporal Data: A Survey
4 pages, 1 Table
International Journal of Computer Science and Information Security (IJCSIS), ISSN:1947-5500, Vol. 11, No. 2
null
null
cs.DB cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In real world, the huge amount of temporal data is to be processed in many application areas such as scientific, financial, network monitoring, sensor data analysis. Data mining techniques are primarily oriented to handle discrete features. In the case of temporal data the time plays an important role on the characteristics of data. To consider this effect, the data discretization techniques have to consider the time while processing to resolve the issue by finding the intervals of data which are more concise and precise with respect to time. Here, this research is reviewing different data discretization techniques used in temporal data applications according to the inclusion or exclusion of: class label, temporal order of the data and handling of stream data to open the research direction for temporal data discretization to improve the performance of data mining technique.
[ { "created": "Tue, 18 Feb 2014 10:44:01 GMT", "version": "v1" } ]
2014-02-19
[ [ "Chaudhari", "P.", "" ], [ "Rana", "D. P.", "" ], [ "Mehta", "R. G.", "" ], [ "Mistry", "N. J.", "" ], [ "Raghuwanshi", "M. M.", "" ] ]
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1402.4289
Kentaro Somiya
Shinichiro Ueda, Nana Saito, Daniel Friedrich, Yoichi Aso, and Kentaro Somiya (for the KAGRA collaboration)
Method to reduce excess noise of a detuned cavity for application in KAGRA
17 pages, 14 figures
Class.Quantum Grav. 31, 095003 (2014)
10.1088/0264-9381/31/9/095003
null
gr-qc physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Ground-based gravitational-wave detectors are based on high precision laser interferometry. One promising technique to improve the detector's sensitivity is the detuning of an optical cavity, which enhances the signal at around certain frequencies for target astronomical sources. The detuning, however, involves technical noise due to an asymmetry of the control sidebands, which includes photo-detector noise and oscillator-phase noise. Here, we introduce a solution to reduce the two kinds of excess noise using an amplitude-modulation sideband that compensates the asymmetry. The solution is planned to be implemented in the Japanese second-generation gravitational-wave detector KAGRA.
[ { "created": "Tue, 18 Feb 2014 10:58:58 GMT", "version": "v1" } ]
2020-07-06
[ [ "Ueda", "Shinichiro", "", "for the KAGRA collaboration" ], [ "Saito", "Nana", "", "for the KAGRA collaboration" ], [ "Friedrich", "Daniel", "", "for the KAGRA collaboration" ], [ "Aso", "Yoichi", "", "for the KAGRA collaboration" ], [ "Somiya", "Kentaro", "", "for the KAGRA collaboration" ] ]
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1402.4293
Alexander Davies
Alex Davies, Zoubin Ghahramani
The Random Forest Kernel and other kernels for big data from random partitions
null
null
null
null
stat.ML cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present Random Partition Kernels, a new class of kernels derived by demonstrating a natural connection between random partitions of objects and kernels between those objects. We show how the construction can be used to create kernels from methods that would not normally be viewed as random partitions, such as Random Forest. To demonstrate the potential of this method, we propose two new kernels, the Random Forest Kernel and the Fast Cluster Kernel, and show that these kernels consistently outperform standard kernels on problems involving real-world datasets. Finally, we show how the form of these kernels lend themselves to a natural approximation that is appropriate for certain big data problems, allowing $O(N)$ inference in methods such as Gaussian Processes, Support Vector Machines and Kernel PCA.
[ { "created": "Tue, 18 Feb 2014 11:13:45 GMT", "version": "v1" } ]
2014-02-19
[ [ "Davies", "Alex", "" ], [ "Ghahramani", "Zoubin", "" ] ]
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1402.4295
Cl\'elia Robert Dr
Juliette Voyez, Cl\'elia Robert, Jean-Marc Conan, Laurent M. Mugnier, Etienne Samain, and Aziz Ziad
First on-sky results of the CO-SLIDAR Cn2 profiler
accepted in Optics Express
null
10.1364/OE.22.010948
null
physics.ao-ph astro-ph.IM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
COupled SLope and scIntillation Detection And Ranging (CO-SLIDAR) is a recent profiling method of the vertical distribution of atmospheric turbulence strength ($C_n^2$ profile). It takes advantage of correlations of slopes and of scintillation, both measured with a Shack-Hartmann wavefront sensor on a binary star. In this paper, we present the improved CO-SLIDAR reconstruction method of the $C_n^2$ profile and the first on-sky results of the CO-SLIDAR profiler. We examine CO-SLIDAR latest performance in simulation, taking into account the detection noise bias and estimating error bars along with the turbulence profile. The estimated $C_n^2$ profiles demonstrate the accuracy of the CO-SLIDAR method, showing sensitivity to both low and high altitude turbulent layers. CO-SLIDAR is tested on-sky for the first time, on the $1.5$~m MeO (M\'etrologie Optique) telescope at Observatoire de la Cote d'Azur (France). The reconstructed profiles are compared to turbulence profiles estimated from meteorological data and a good agreement is found. We discuss CO-SLIDAR's contribution in the $C_n^2$ profilers' landscape and we propose some improvements of the instrument.
[ { "created": "Tue, 18 Feb 2014 11:15:20 GMT", "version": "v1" } ]
2015-06-18
[ [ "Voyez", "Juliette", "" ], [ "Robert", "Clélia", "" ], [ "Conan", "Jean-Marc", "" ], [ "Mugnier", "Laurent M.", "" ], [ "Samain", "Etienne", "" ], [ "Ziad", "Aziz", "" ] ]
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1402.4301
Jianhui Bin
J.H. Bin, W.J. Ma, H.Y. Wang, M.J.V. Streeter, C. Kreuzer, D. Kiefer, M. Yeung, S. Cousens, P.S. Foster, B. Dromey, X.Q. Yan, J. Meyer-ter-Vehn, M. Zepf, and J. Schreiber
Relativistic plasma optics enabled by near-critical density nanostructured material
11 pages+5 pages (supplementary information), 4 figures+ 2 figures (supplementary information)
null
null
null
physics.plasm-ph physics.acc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The nonlinear optical properties of a plasma due to the relativistic electron motion in an intense laser field are of fundamental importance for current research and the generation of brilliant laser-driven sources of particles and photons1-15. Yet, one of the most interesting regimes, where the frequency of the laser becomes resonant with the plasma, has remained experimentally hard to access. We overcome this limitation by utilizing ultrathin carbon nanotube foam16 (CNF) targets allowing the strong relativistic nonlinearities at near- critical density (NCD) to be exploited for the first time. We report on the experimental realization of relativistic plasma optics to spatio-temporally compress the laser pulse within a few micrometers of propagation, while maintaining about half its energy. We also apply the enhanced laser pulses to substantially improve the properties of an ion bunch accelerated from a secondary target. Our results provide first insights into the rich physics of NCD plasmas and the opportunities waiting to be harvested for applications.
[ { "created": "Tue, 18 Feb 2014 11:28:05 GMT", "version": "v1" }, { "created": "Tue, 18 Mar 2014 15:15:44 GMT", "version": "v2" } ]
2014-03-19
[ [ "Bin", "J. H.", "" ], [ "Ma", "W. J.", "" ], [ "Wang", "H. Y.", "" ], [ "Streeter", "M. J. V.", "" ], [ "Kreuzer", "C.", "" ], [ "Kiefer", "D.", "" ], [ "Yeung", "M.", "" ], [ "Cousens", "S.", "" ], [ "Foster", "P. S.", "" ], [ "Dromey", "B.", "" ], [ "Yan", "X. Q.", "" ], [ "Meyer-ter-Vehn", "J.", "" ], [ "Zepf", "M.", "" ], [ "Schreiber", "J.", "" ] ]
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1402.4302
Enys Mones
Enys Mones and Nuno A. M. Ara\'ujo and Tam\'as Vicsek and Hans J. Herrmann
Shock waves on complex networks
null
null
10.1038/srep04949
null
physics.soc-ph cond-mat.stat-mech physics.comp-ph physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Power grids, road maps, and river streams are examples of infrastructural networks which are highly vulnerable to external perturbations. An abrupt local change of load (voltage, traffic density, or water level) might propagate in a cascading way and affect a significant fraction of the network. Almost discontinuous perturbations can be modeled by shock waves which can eventually interfere constructively and endanger the normal functionality of the infrastructure. We study their dynamics by solving the Burgers equation under random perturbations on several real and artificial directed graphs. Even for graphs with a narrow distribution of node properties (e.g., degree or betweenness), a steady state is reached exhibiting a heterogeneous load distribution, having a difference of one order of magnitude between the highest and average loads. Unexpectedly we find for the European power grid and for finite Watts-Strogatz networks a broad pronounced bimodal distribution for the loads. To identify the most vulnerable nodes, we introduce the concept of node-basin size, a purely topological property which we show to be strongly correlated to the average load of a node.
[ { "created": "Tue, 18 Feb 2014 11:30:22 GMT", "version": "v1" } ]
2014-05-23
[ [ "Mones", "Enys", "" ], [ "Araújo", "Nuno A. M.", "" ], [ "Vicsek", "Tamás", "" ], [ "Herrmann", "Hans J.", "" ] ]
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1402.4303
Christian Geist
Christian Geist
Finding Preference Profiles of Condorcet Dimension $k$ via SAT
Corrected typos, updated references, and added conclusion
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cs.MA cs.AI cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Condorcet winning sets are a set-valued generalization of the well-known concept of a Condorcet winner. As supersets of Condorcet winning sets are always Condorcet winning sets themselves, an interesting property of preference profiles is the size of the smallest Condorcet winning set they admit. This smallest size is called the Condorcet dimension of a preference profile. Since little is known about profiles that have a certain Condorcet dimension, we show in this paper how the problem of finding a preference profile that has a given Condorcet dimension can be encoded as a satisfiability problem and solved by a SAT solver. Initial results include a minimal example of a preference profile of Condorcet dimension 3, improving previously known examples both in terms of the number of agents as well as alternatives. Due to the high complexity of such problems it remains open whether a preference profile of Condorcet dimension 4 exists.
[ { "created": "Tue, 18 Feb 2014 11:31:08 GMT", "version": "v1" }, { "created": "Wed, 2 Mar 2016 17:01:37 GMT", "version": "v2" } ]
2016-03-03
[ [ "Geist", "Christian", "" ] ]
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1402.4304
James Lloyd
James Robert Lloyd, David Duvenaud, Roger Grosse, Joshua B. Tenenbaum, Zoubin Ghahramani
Automatic Construction and Natural-Language Description of Nonparametric Regression Models
null
null
null
null
stat.ML cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper presents the beginnings of an automatic statistician, focusing on regression problems. Our system explores an open-ended space of statistical models to discover a good explanation of a data set, and then produces a detailed report with figures and natural-language text. Our approach treats unknown regression functions nonparametrically using Gaussian processes, which has two important consequences. First, Gaussian processes can model functions in terms of high-level properties (e.g. smoothness, trends, periodicity, changepoints). Taken together with the compositional structure of our language of models this allows us to automatically describe functions in simple terms. Second, the use of flexible nonparametric models and a rich language for composing them in an open-ended manner also results in state-of-the-art extrapolation performance evaluated over 13 real time series data sets from various domains.
[ { "created": "Tue, 18 Feb 2014 11:38:11 GMT", "version": "v1" }, { "created": "Mon, 24 Feb 2014 15:38:36 GMT", "version": "v2" }, { "created": "Thu, 24 Apr 2014 11:44:13 GMT", "version": "v3" } ]
2014-04-25
[ [ "Lloyd", "James Robert", "" ], [ "Duvenaud", "David", "" ], [ "Grosse", "Roger", "" ], [ "Tenenbaum", "Joshua B.", "" ], [ "Ghahramani", "Zoubin", "" ] ]
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Automatic Construction and Natural-Language Description of Nonparametric Regression Models
http://arxiv.org/abs/1402.4304v3
http://arxiv.org/pdf/1402.4304v3.pdf
https://github.com/jamesrobertlloyd/gp-structure-search
false
false
https://paperswithcode.com/paper/automatic-construction-and-natural-language
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1402.4306
Amar Shah
Amar Shah, Andrew Gordon Wilson and Zoubin Ghahramani
Student-t Processes as Alternatives to Gaussian Processes
13 pages, 6 figures, 1 table. To appear in "The Seventeenth International Conference on Artificial Intelligence and Statistics (AISTATS), 2014."
null
null
null
stat.ML cs.AI cs.LG stat.ME
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We investigate the Student-t process as an alternative to the Gaussian process as a nonparametric prior over functions. We derive closed form expressions for the marginal likelihood and predictive distribution of a Student-t process, by integrating away an inverse Wishart process prior over the covariance kernel of a Gaussian process model. We show surprising equivalences between different hierarchical Gaussian process models leading to Student-t processes, and derive a new sampling scheme for the inverse Wishart process, which helps elucidate these equivalences. Overall, we show that a Student-t process can retain the attractive properties of a Gaussian process -- a nonparametric representation, analytic marginal and predictive distributions, and easy model selection through covariance kernels -- but has enhanced flexibility, and predictive covariances that, unlike a Gaussian process, explicitly depend on the values of training observations. We verify empirically that a Student-t process is especially useful in situations where there are changes in covariance structure, or in applications like Bayesian optimization, where accurate predictive covariances are critical for good performance. These advantages come at no additional computational cost over Gaussian processes.
[ { "created": "Tue, 18 Feb 2014 11:47:38 GMT", "version": "v1" }, { "created": "Wed, 19 Feb 2014 10:49:16 GMT", "version": "v2" } ]
2014-02-20
[ [ "Shah", "Amar", "" ], [ "Wilson", "Andrew Gordon", "" ], [ "Ghahramani", "Zoubin", "" ] ]
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1402.4308
Kittipong Kittichokechai
Kittipong Kittichokechai, Tobias J. Oechtering, Mikael Skoglund
Lossy Source Coding with Reconstruction Privacy
22 pages, added proofs, to be presented at ISIT 2014
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider the problem of lossy source coding with side information under a privacy constraint that the reconstruction sequence at a decoder should be kept secret to a certain extent from another terminal such as an eavesdropper, a sender, or a helper. We are interested in how the reconstruction privacy constraint at a particular terminal affects the rate-distortion tradeoff. In this work, we allow the decoder to use a random mapping, and give inner and outer bounds to the rate-distortion-equivocation region for different cases where the side information is available non-causally and causally at the decoder. In the special case where each reconstruction symbol depends only on the source description and current side information symbol, the complete rate-distortion-equivocation region is provided. A binary example illustrating a new tradeoff due to the new privacy constraint, and a gain from the use of a stochastic decoder is given.
[ { "created": "Tue, 18 Feb 2014 12:09:05 GMT", "version": "v1" }, { "created": "Tue, 24 Jun 2014 15:31:34 GMT", "version": "v2" } ]
2014-06-25
[ [ "Kittichokechai", "Kittipong", "" ], [ "Oechtering", "Tobias J.", "" ], [ "Skoglund", "Mikael", "" ] ]
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1402.4310
Xuan Guang
Jiyong Lu, Xuan Guang, and Fang-Wei Fu
Distributed Storage over Unidirectional Ring Networks
28 pages, one column, 12 figures, submitted for possible publication. arXiv admin note: substantial text overlap with arXiv:1401.5168
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cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we study distributed storage problems over unidirectional ring networks, whose storage nodes form a directed ring and data is transmitted along the same direction. The original data is distributed to store on these nodes. Each user can connect one and only one storage node to download the total data. A lower bound on the reconstructing bandwidth to recover the original data for each user is proposed, and it is achievable for arbitrary parameters. If a distributed storage scheme can achieve this lower bound with equality for every user, we say it an optimal reconstructing distributed storage scheme (ORDSS). Furthermore, the repair problem for a failed storage node in ORDSSes is under consideration and a tight lower bound on the repair bandwidth is obtained. In particular, we indicate the fact that for any ORDSS, every storage node can be repaired with repair bandwidth achieving the lower bound with equality. In addition, we present two constructions for ORDSSes of arbitrary parameters, called MDS construction and ED construction, respectively. Particularly, ED construction, by using the concept of Euclidean division, is more efficient by our analysis in detail.
[ { "created": "Tue, 18 Feb 2014 12:13:32 GMT", "version": "v1" }, { "created": "Fri, 28 Feb 2014 12:02:15 GMT", "version": "v2" }, { "created": "Mon, 14 Apr 2014 04:01:11 GMT", "version": "v3" } ]
2014-04-15
[ [ "Lu", "Jiyong", "" ], [ "Guang", "Xuan", "" ], [ "Fu", "Fang-Wei", "" ] ]
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1402.4312
Hartmut Klauck
Hartmut Klauck and Supartha Podder
Two Results about Quantum Messages
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quant-ph cs.CC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We show two results about the relationship between quantum and classical messages. Our first contribution is to show how to replace a quantum message in a one-way communication protocol by a deterministic message, establishing that for all partial Boolean functions $f:\{0,1\}^n\times\{0,1\}^m\to\{0,1\}$ we have $D^{A\to B}(f)\leq O(Q^{A\to B,*}(f)\cdot m)$. This bound was previously known for total functions, while for partial functions this improves on results by Aaronson, in which either a log-factor on the right hand is present, or the left hand side is $R^{A\to B}(f)$, and in which also no entanglement is allowed. In our second contribution we investigate the power of quantum proofs over classical proofs. We give the first example of a scenario, where quantum proofs lead to exponential savings in computing a Boolean function. The previously only known separation between the power of quantum and classical proofs is in a setting where the input is also quantum. We exhibit a partial Boolean function $f$, such that there is a one-way quantum communication protocol receiving a quantum proof (i.e., a protocol of type QMA) that has cost $O(\log n)$ for $f$, whereas every one-way quantum protocol for $f$ receiving a classical proof (protocol of type QCMA) requires communication $\Omega(\sqrt n/\log n)$.
[ { "created": "Tue, 18 Feb 2014 12:27:58 GMT", "version": "v1" }, { "created": "Wed, 16 Apr 2014 08:29:19 GMT", "version": "v2" } ]
2014-04-17
[ [ "Klauck", "Hartmut", "" ], [ "Podder", "Supartha", "" ] ]
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1402.4314
Tom\'a\v{s} V\'avra
Daniel Dombek, Zuzana Mas\'akov\'a, Tom\'a\v{s} V\'avra
Confluent Parry numbers, their spectra, and integers in positive- and negative-base number systems
22pp
null
null
null
math.CO cs.DM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we study the expansions of real numbers in positive and negative real base as introduced by R\'enyi, and Ito & Sadahiro, respectively. In particular, we compare the sets $\mathbb{Z}_\beta^+$ and $\mathbb{Z}_{-\beta}$ of nonnegative $\beta$-integers and $(-\beta)$-integers. We describe all bases $(\pm\beta)$ for which $\mathbb{Z}_\beta^+$ and $\mathbb{Z}_{-\beta}$ can be coded by infinite words which are fixed points of conjugated morphisms, and consequently have the same language. Moreover, we prove that this happens precisely for $\beta$ with another interesting property, namely that any integer linear combination of non-negative powers of the base $-\beta$ with coefficients in $\{0,1,\dots,\lfloor\beta\rfloor\}$ is a $(-\beta)$-integer, although the corresponding sequence of digits is forbidden as a $(-\beta)$-integer.
[ { "created": "Tue, 18 Feb 2014 12:54:00 GMT", "version": "v1" } ]
2014-02-19
[ [ "Dombek", "Daniel", "" ], [ "Masáková", "Zuzana", "" ], [ "Vávra", "Tomáš", "" ] ]
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1402.4320
Xiaofeng Wang
Xiaofeng Wang, Federico Gobbo, Michael Lane
Turning Time from Enemy into an Ally Using the Pomodoro Technique
18 pages, 4 figures, 2 tables, book chapter. Agility Across Time and Space (Smite et al. ed.), 2010
null
null
null
cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Time is one of the most important factors dominating agile software development processes in distributed settings. Effective time management helps agile teams to plan and monitor the work to be performed, and create and maintain a fast yet sustainable pace. The Pomodoro Technique is one promising time management technique. Its application and adaptation in Sourcesense Milan Team surfaced various benefits, challenges and implications for distributed agile software development. Lessons learnt from the experiences of Sourcesense Milan Team can be useful for other distributed agile teams to turn time from enemy into an ally.
[ { "created": "Tue, 18 Feb 2014 13:02:00 GMT", "version": "v1" } ]
2014-02-19
[ [ "Wang", "Xiaofeng", "" ], [ "Gobbo", "Federico", "" ], [ "Lane", "Michael", "" ] ]
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1402.4322
Alvaro Martinez
A. Mart\'inez-P\'erez
On the properties of $\alpha$-unchaining single linkage hierarchical clustering
14 pages, 4 figures. arXiv admin note: substantial text overlap with arXiv:1210.6292
null
null
null
cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In the election of a hierarchical clustering method, theoretic properties may give some insight to determine which method is the most suitable to treat a clustering problem. Herein, we study some basic properties of two hierarchical clustering methods: $\alpha$-unchaining single linkage or $SL(\alpha)$ and a modified version of this one, $SL^*(\alpha)$. We compare the results with the properties satisfied by the classical linkage-based hierarchical clustering methods.
[ { "created": "Tue, 18 Feb 2014 13:08:47 GMT", "version": "v1" } ]
2014-02-19
[ [ "Martínez-Pérez", "A.", "" ] ]
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1402.4325
Raul Mondrag\'on Dr
Athen Ma and Raul J Mondragon
Rich-cores in networks
12 pages, 6 figures
null
10.1371/journal.pone.0119678
null
physics.soc-ph cs.SI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A core is said to be a group of central and densely connected nodes which governs the overall behavior of a network. Profiling this meso--scale structure currently relies on a limited number of methods which are often complex, and have scalability issues when dealing with very large networks. As a result, we are yet to fully understand its impact on network properties and dynamics. Here we introduce a simple method to profile this structure by combining the concepts of core/periphery and rich-club. The key challenge in addressing such association of the two concepts is to establish a way to define the membership of the core. The notion of a "rich-club" describes nodes which are essentially the hub of a network, as they play a dominating role in structural and functional properties. Interestingly, the definition of a rich-club naturally emphasizes high degree nodes and divides a network into two subgroups. Our approach theoretically couples the underlying principle of a rich-club with the escape time of a random walker, and a rich-core is defined by examining changes in the associated persistence probability. The method is fast and scalable to large networks. In particular, we successfully show that the evolution of the core in \emph{C. elegans} and World Trade networks correspond to key development stages and responses to historical events respectively.
[ { "created": "Tue, 18 Feb 2014 13:18:51 GMT", "version": "v1" } ]
2015-08-19
[ [ "Ma", "Athen", "" ], [ "Mondragon", "Raul J", "" ] ]
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1402.4327
Marc Bagnol
Cl\'ement Aubert, Marc Bagnol
Unification and Logarithmic Space
null
International Conference on Rewriting Techniques and Applications RTA 2014: Rewriting and Typed Lambda Calculi pp 77-9
10.1007/978-3-319-08918-8_6
null
cs.LO
http://creativecommons.org/licenses/by-nc-sa/3.0/
We present an algebraic characterization of the complexity classes Logspace and NLogspace, using an algebra with a composition law based on unification. This new bridge between unification and complexity classes is inspired from proof theory and more specifically linear logic and Geometry of Interaction. We show how unification can be used to build a model of computation by means of specific subalgebras associated to finite permutations groups. We then prove that whether an observation (the algebraic counterpart of a program) accepts a word can be decided within logarithmic space. We also show that the construction can naturally represent pointer machines, an intuitive way of understanding logarithmic space computing.
[ { "created": "Tue, 18 Feb 2014 13:32:50 GMT", "version": "v1" }, { "created": "Mon, 24 Mar 2014 23:20:13 GMT", "version": "v2" }, { "created": "Thu, 27 Mar 2014 11:13:25 GMT", "version": "v3" } ]
2018-05-29
[ [ "Aubert", "Clément", "" ], [ "Bagnol", "Marc", "" ] ]
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1402.4332
Krishna Kumar Dr
P. Maity, K. Kumar and P. Pal
Homoclinic bifurcations in low-Prandtl-number Rayleigh-B\'{e}nard convection with uniform rotation
6 pages, 7 figures, 1 table
Europhysics Letters 103 (2013) 64003
10.1209/0295-5075/103/64003
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present results of direct numerical simulations on homoclinic gluing and ungluing bifurcations in low-Prandtl-number ($ 0 \leq Pr \leq 0.025 $) Rayleigh-B\'{e}nard system rotating slowly and uniformly about a vertical axis. We have performed simulations with \textit{stress-free} top and bottom boundaries for several values of Taylor number ($5 \leq Ta \leq 50$) near the instability onset. We observe a single homoclinic ungluing bifurcation, marked by the spontaneous breaking of a larger limit cycle into two limit cycles with the variation of the reduced Rayleigh number $r$ for smaller values of $Ta (< 25)$. A pair of homoclinic bifurcations, instead of one bifurcation, is observed with variation of $r$ for slightly higher values of $Ta$ ($25 \leq Ta \leq 50$) in the same fluid dynamical system. The variation of the bifurcation threshold with $Ta$ is also investigated. We have also constructed a low-dimensional model which qualitatively captures the dynamics of the system near the homoclinic bifurcations for low rotation rates. The model is used to study the unfolding of bifurcations and the variation of the homoclinic bifurcation threshold with $Pr$.
[ { "created": "Tue, 18 Feb 2014 13:50:12 GMT", "version": "v1" } ]
2014-02-19
[ [ "Maity", "P.", "" ], [ "Kumar", "K.", "" ], [ "Pal", "P.", "" ] ]
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1402.4335
Nikolaj Thomas Zinner
J. K. Pedersen and D. V. Fedorov and A. S. Jensen and N. T. Zinner
Formation of classical crystals of dipolar particles in a helical geometry
13 pages, 13 figures, revised version
J. Phys. B: At. Mol. Opt. Phys. 47 (2014) 165103
10.1088/0953-4075/47/16/165103
null
cond-mat.quant-gas physics.atm-clus quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider crystal formation of particles with dipole-dipole interactions that are confined to move in a one-dimensional helical geometry with their dipole moments oriented along the symmetry axis of the confining helix. The stable classical lowest energy configurations are found to be chain structures for a large range of pitch-to-radius ratios for relatively low density of dipoles and a moderate total number of particles. The classical normal mode spectra support the chain interpretation both through structure and the distinct degeneracies depending discretely on the number of dipoles per revolution. A larger total number of dipoles leads to a clusterization where the dipolar chains move closer to each other. This implies a change in the local density and the emergence of two length scales, one for the cluster size and one for the inter-cluster distance along the helix. Starting from three dipoles per revolution, this implies a breaking of the initial periodicity to form a cluster of two chains close together and a third chain removed from the cluster. This is driven by the competition between in-chain and out-of-chain interactions, or alternatively the side-by-side repulsion and the head-to-tail attraction in the system. The speed of sound propagates along the chains. It is independent of the number of chains although depending on geometry.
[ { "created": "Tue, 18 Feb 2014 13:55:25 GMT", "version": "v1" }, { "created": "Mon, 11 Aug 2014 13:48:54 GMT", "version": "v2" } ]
2014-08-12
[ [ "Pedersen", "J. K.", "" ], [ "Fedorov", "D. V.", "" ], [ "Jensen", "A. S.", "" ], [ "Zinner", "N. T.", "" ] ]
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1402.4337
Maurice Margenstern
Anthony Gasperin, Maurice Margenstern
A note on groups of a family of hyperbolic tessellations
31 pages, 9 figures
null
null
null
cs.FL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we study the word problem of groups corresponding to tessellations of the hyperbolic plane. In particular using the Fibonacci technology developed by the second author we show that groups corresponding to the pentagrid or the heptagrid are not automatic.
[ { "created": "Tue, 18 Feb 2014 13:58:05 GMT", "version": "v1" } ]
2014-02-19
[ [ "Gasperin", "Anthony", "" ], [ "Margenstern", "Maurice", "" ] ]
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1402.4338
Gabriel Istrate
Gabriel Istrate and Adrian Cr\u{a}ciun
Proof Complexity and the Kneser-Lov\'asz Theorem
null
Proceedings of the 17th International Conference on Theory and Applications of Satisfiability Testing (SAT'14), vol. 8561, 2014
null
null
cs.CC cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We investigate the proof complexity of a class of propositional formulas expressing a combinatorial principle known as the Kneser-Lov\'{a}sz Theorem. This is a family of propositional tautologies, indexed by an nonnegative integer parameter $k$ that generalizes the Pigeonhole Principle (obtained for $k=1$). We show, for all fixed $k$, $2^{\Omega(n)}$ lower bounds on resolution complexity and exponential lower bounds for bounded depth Frege proofs. These results hold even for the more restricted class of formulas encoding Schrijver's strenghtening of the Kneser-Lov\'{a}sz Theorem. On the other hand for the cases $k=2,3$ (for which combinatorial proofs of the Kneser-Lov\'{a}sz Theorem are known) we give polynomial size Frege ($k=2$), respectively extended Frege ($k=3$) proofs. The paper concludes with a brief announcement of the results (presented in subsequent work) on the proof complexity of the general case of the Kneser-Lov\'{a}sz theorem.
[ { "created": "Tue, 18 Feb 2014 13:58:07 GMT", "version": "v1" }, { "created": "Tue, 15 May 2018 14:52:06 GMT", "version": "v2" } ]
2018-05-16
[ [ "Istrate", "Gabriel", "" ], [ "Crăciun", "Adrian", "" ] ]
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1402.4343
Gabriel Istrate
Cosmin Bonchi\c{s} and Gabriel Istrate
Minimum Entropy Submodular Optimization (and Fairness in Cooperative Games)
null
null
null
null
cs.DS cs.GT math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study minimum entropy submodular optimization, a common generalization of the minimum entropy set cover problem, studied earlier by Cardinal et al., and the submodular set cover problem. We give a general bound of the approximation performance of the greedy algorithm using an approach that can be interpreted in terms of a particular type of biased network flows. As an application we rederive known results for the Minimum Entropy Set Cover and Minimum Entropy Orientation problems, and obtain a nontrivial bound for a new problem called the Minimum Entropy Spanning Tree problem. The problem can be applied to (and is partly motivated by) the definition of worst-case approaches to fairness in concave cooperative games, similar to the notion of price of anarchy in noncooperative settings.
[ { "created": "Tue, 18 Feb 2014 14:10:19 GMT", "version": "v1" } ]
2014-02-19
[ [ "Bonchiş", "Cosmin", "" ], [ "Istrate", "Gabriel", "" ] ]
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1402.4346
Chihao Zhang
Jingcheng Liu, Pinyan Lu and Chihao Zhang
The Complexity of Ferromagnetic Two-spin Systems with External Fields
null
null
null
null
cs.CC cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the approximability of computing the partition function for ferromagnetic two-state spin systems. The remarkable algorithm by Jerrum and Sinclair showed that there is a fully polynomial-time randomized approximation scheme (FPRAS) for the special ferromagnetic Ising model with any given uniform external field. Later, Goldberg and Jerrum proved that it is #BIS-hard for Ising model if we allow inconsistent external fields on different nodes. In contrast to these two results, we prove that for any ferromagnetic two-state spin systems except the Ising model, there exists a threshold for external fields beyond which the problem is #BIS-hard, even if the external field is uniform.
[ { "created": "Tue, 18 Feb 2014 14:20:54 GMT", "version": "v1" } ]
2014-02-19
[ [ "Liu", "Jingcheng", "" ], [ "Lu", "Pinyan", "" ], [ "Zhang", "Chihao", "" ] ]
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1402.4353
Ricardo Blasco-Serrano
Ricardo Blasco-Serrano, Ragnar Thobaben, Mikael Skoglund
Communication and Interference Coordination
null
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the problem of controlling the interference created to an external observer by a communication processes. We model the interference in terms of its type (empirical distribution), and we analyze the consequences of placing constraints on the admissible type. Considering a single interfering link, we characterize the communication-interference capacity region. Then, we look at a scenario where the interference is jointly created by two users allowed to coordinate their actions prior to transmission. In this case, the trade-off involves communication and interference as well as coordination. We establish an achievable communication-interference region and show that efficiency is significantly improved by coordination.
[ { "created": "Tue, 18 Feb 2014 14:34:50 GMT", "version": "v1" } ]
2014-02-19
[ [ "Blasco-Serrano", "Ricardo", "" ], [ "Thobaben", "Ragnar", "" ], [ "Skoglund", "Mikael", "" ] ]
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1402.4354
Stefano Teso
Stefano Teso and Roberto Sebastiani and Andrea Passerini
Hybrid SRL with Optimization Modulo Theories
null
null
null
null
cs.LG stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Generally speaking, the goal of constructive learning could be seen as, given an example set of structured objects, to generate novel objects with similar properties. From a statistical-relational learning (SRL) viewpoint, the task can be interpreted as a constraint satisfaction problem, i.e. the generated objects must obey a set of soft constraints, whose weights are estimated from the data. Traditional SRL approaches rely on (finite) First-Order Logic (FOL) as a description language, and on MAX-SAT solvers to perform inference. Alas, FOL is unsuited for con- structive problems where the objects contain a mixture of Boolean and numerical variables. It is in fact difficult to implement, e.g. linear arithmetic constraints within the language of FOL. In this paper we propose a novel class of hybrid SRL methods that rely on Satisfiability Modulo Theories, an alternative class of for- mal languages that allow to describe, and reason over, mixed Boolean-numerical objects and constraints. The resulting methods, which we call Learning Mod- ulo Theories, are formulated within the structured output SVM framework, and employ a weighted SMT solver as an optimization oracle to perform efficient in- ference and discriminative max margin weight learning. We also present a few examples of constructive learning applications enabled by our method.
[ { "created": "Tue, 18 Feb 2014 14:35:30 GMT", "version": "v1" } ]
2014-02-19
[ [ "Teso", "Stefano", "" ], [ "Sebastiani", "Roberto", "" ], [ "Passerini", "Andrea", "" ] ]
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1402.4360
Ye Wang
Ye Wang, Prakash Ishwar, Shantanu Rane
An Elementary Completeness Proof for Secure Two-Party Computation Primitives
6 pages, extended version of ITW 2014 paper
null
null
null
cs.CR cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In the secure two-party computation problem, two parties wish to compute a (possibly randomized) function of their inputs via an interactive protocol, while ensuring that neither party learns more than what can be inferred from only their own input and output. For semi-honest parties and information-theoretic security guarantees, it is well-known that, if only noiseless communication is available, only a limited set of functions can be securely computed; however, if interaction is also allowed over general communication primitives (multi-input/output channels), there are "complete" primitives that enable any function to be securely computed. The general set of complete primitives was characterized recently by Maji, Prabhakaran, and Rosulek leveraging an earlier specialized characterization by Kilian. Our contribution in this paper is a simple, self-contained, alternative derivation using elementary information-theoretic tools.
[ { "created": "Tue, 18 Feb 2014 14:48:46 GMT", "version": "v1" }, { "created": "Fri, 12 Dec 2014 22:39:23 GMT", "version": "v2" } ]
2014-12-16
[ [ "Wang", "Ye", "" ], [ "Ishwar", "Prakash", "" ], [ "Rane", "Shantanu", "" ] ]
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1402.4364
Vincenzo Roselli
Patrizio Angelini, Giordano Da Lozzo, Giuseppe Di Battista, Fabrizio Frati, Maurizio Patrignani, Vincenzo Roselli
Morphing Planar Graph Drawings Optimally
null
null
null
null
cs.DS cs.CG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We provide an algorithm for computing a planar morph between any two planar straight-line drawings of any $n$-vertex plane graph in $O(n)$ morphing steps, thus improving upon the previously best known $O(n^2)$ upper bound. Further, we prove that our algorithm is optimal, that is, we show that there exist two planar straight-line drawings $\Gamma_s$ and $\Gamma_t$ of an $n$-vertex plane graph $G$ such that any planar morph between $\Gamma_s$ and $\Gamma_t$ requires $\Omega(n)$ morphing steps.
[ { "created": "Tue, 18 Feb 2014 14:55:41 GMT", "version": "v1" }, { "created": "Wed, 19 Feb 2014 08:55:05 GMT", "version": "v2" } ]
2014-02-20
[ [ "Angelini", "Patrizio", "" ], [ "Da Lozzo", "Giordano", "" ], [ "Di Battista", "Giuseppe", "" ], [ "Frati", "Fabrizio", "" ], [ "Patrignani", "Maurizio", "" ], [ "Roselli", "Vincenzo", "" ] ]
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1402.4366
Ali Hadjihosseini
A. Hadjihosseini, J. Peinke and N. P. Hoffmann
Stochastic analysis of ocean wave states with and without rogue waves
18 pages, 13 figures
null
10.1088/1367-2630/16/5/053037
null
physics.data-an physics.ao-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This work presents an analysis of ocean wave data including rogue waves. A stochastic approach based on the theory of Markov processes is applied. With this analysis we achieve a characterization of the scale dependent complexity of ocean waves by means of a Fokker-Planck equation, providing stochastic information of multi-scale processes. In particular we show evidence of Markov properties for increment processes, which means that a three point closure for the complexity of the wave structures seems to be valid. Furthermore we estimate the parameters of the Fokker-Planck equation by parameter-free data analysis. The resulting Fokker-Planck equations are verified by numerical reconstruction. This work presents a new approach where the coherent structure of rogue waves seems to be integrated into the fundamental statistics of complex wave states.
[ { "created": "Tue, 18 Feb 2014 15:00:44 GMT", "version": "v1" } ]
2015-06-18
[ [ "Hadjihosseini", "A.", "" ], [ "Peinke", "J.", "" ], [ "Hoffmann", "N. P.", "" ] ]
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1402.4369
Wenjun Ma
W.J. Ma, J.H. Bin, H.Y. Wang, M. Yeung, C. Kreuzer, M. Streeter, P.S. Foster, S. Cousens, D. Kiefer, B. Dromey, X.Q. Yan, M. Zepf, J. Meyer-ter-Vehn, J. Schreiber
Bright subcycle XUV pulse from a single dense relativistic electron sheet
10 pages, 3 figures
null
10.1103/PhysRevLett.113.235002
null
physics.plasm-ph physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Relativistic electrons are prodigious sources of photons. Beyond classical accelerators, ultra-intense laser interactions are of particular interest as they allow the coherent motion of relativistic electrons to be controlled and exploited as sources of radiation. Under extreme laser conditions theory predicts that isolated free relativistic electron sheets (FRES) can be produced and exploited for the production of a new class of radiation - unipolar extreme ultraviolet(XUV) pulses. However, the combination of extremely rapid rise-time and highest peak intensity in these simulations is still beyond current laser technology. We demonstrate a route to isolated FRES with existing lasers by exploiting relativistic transparency to produce an ultra-intense pulse with a steep rise time. When such an FRES interacts with a second, oblique target foil the electron sheet is rapidly accelerated ('kicked'). The radiation signature and simulations demonstrate that a single, nanometer thick FRES was produced. The experimental observations together with our theoretical modeling suggest the production of the first unipolar (half-cycle) pulse in the XUV - an achievement that has so far only been realized in the terahertz spectral domain.
[ { "created": "Tue, 18 Feb 2014 15:12:12 GMT", "version": "v1" } ]
2015-06-18
[ [ "Ma", "W. J.", "" ], [ "Bin", "J. H.", "" ], [ "Wang", "H. Y.", "" ], [ "Yeung", "M.", "" ], [ "Kreuzer", "C.", "" ], [ "Streeter", "M.", "" ], [ "Foster", "P. S.", "" ], [ "Cousens", "S.", "" ], [ "Kiefer", "D.", "" ], [ "Dromey", "B.", "" ], [ "Yan", "X. Q.", "" ], [ "Zepf", "M.", "" ], [ "Meyer-ter-Vehn", "J.", "" ], [ "Schreiber", "J.", "" ] ]
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1402.4370
Chihao Zhang
Pinyan Lu, Menghui Wang and Chihao Zhang
FPTAS for Weighted Fibonacci Gates and Its Applications
null
null
null
null
cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Fibonacci gate problems have severed as computation primitives to solve other problems by holographic algorithm and play an important role in the dichotomy of exact counting for Holant and CSP frameworks. We generalize them to weighted cases and allow each vertex function to have different parameters, which is a much boarder family and #P-hard for exactly counting. We design a fully polynomial-time approximation scheme (FPTAS) for this generalization by correlation decay technique. This is the first deterministic FPTAS for approximate counting in the general Holant framework without a degree bound. We also formally introduce holographic reduction in the study of approximate counting and these weighted Fibonacci gate problems serve as computation primitives for approximate counting. Under holographic reduction, we obtain FPTAS for other Holant problems and spin problems. One important application is developing an FPTAS for a large range of ferromagnetic two-state spin systems. This is the first deterministic FPTAS in the ferromagnetic range for two-state spin systems without a degree bound. Besides these algorithms, we also develop several new tools and techniques to establish the correlation decay property, which are applicable in other problems.
[ { "created": "Tue, 18 Feb 2014 15:15:37 GMT", "version": "v1" } ]
2014-02-19
[ [ "Lu", "Pinyan", "" ], [ "Wang", "Menghui", "" ], [ "Zhang", "Chihao", "" ] ]
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1402.4371
Hung Nien
Hung Nien and Jeffrey A. Fessler
A convergence proof of the split Bregman method for regularized least-squares problems
11 pages, 3 figures, submitted to SIAM J. Imaging Sci
null
null
null
math.OC cs.LG stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The split Bregman (SB) method [T. Goldstein and S. Osher, SIAM J. Imaging Sci., 2 (2009), pp. 323-43] is a fast splitting-based algorithm that solves image reconstruction problems with general l1, e.g., total-variation (TV) and compressed sensing (CS), regularizations by introducing a single variable split to decouple the data-fitting term and the regularization term, yielding simple subproblems that are separable (or partially separable) and easy to minimize. Several convergence proofs have been proposed, and these proofs either impose a "full column rank" assumption to the split or assume exact updates in all subproblems. However, these assumptions are impractical in many applications such as the X-ray computed tomography (CT) image reconstructions, where the inner least-squares problem usually cannot be solved efficiently due to the highly shift-variant Hessian. In this paper, we show that when the data-fitting term is quadratic, the SB method is a convergent alternating direction method of multipliers (ADMM), and a straightforward convergence proof with inexact updates is given using [J. Eckstein and D. P. Bertsekas, Mathematical Programming, 55 (1992), pp. 293-318, Theorem 8]. Furthermore, since the SB method is just a special case of an ADMM algorithm, it seems likely that the ADMM algorithm will be faster than the SB method if the augmented Largangian (AL) penalty parameters are selected appropriately. To have a concrete example, we conduct a convergence rate analysis of the ADMM algorithm using two splits for image restoration problems with quadratic data-fitting term and regularization term. According to our analysis, we can show that the two-split ADMM algorithm can be faster than the SB method if the AL penalty parameter of the SB method is suboptimal. Numerical experiments were conducted to verify our analysis.
[ { "created": "Tue, 18 Feb 2014 15:16:45 GMT", "version": "v1" } ]
2014-02-19
[ [ "Nien", "Hung", "" ], [ "Fessler", "Jeffrey A.", "" ] ]
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1402.4376
Jeremy Kun
Jeremy Kun and Lev Reyzin
On Coloring Resilient Graphs
Appearing in MFCS 2014
null
null
null
cs.CC cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We introduce a new notion of resilience for constraint satisfaction problems, with the goal of more precisely determining the boundary between NP-hardness and the existence of efficient algorithms for resilient instances. In particular, we study $r$-resiliently $k$-colorable graphs, which are those $k$-colorable graphs that remain $k$-colorable even after the addition of any $r$ new edges. We prove lower bounds on the NP-hardness of coloring resiliently colorable graphs, and provide an algorithm that colors sufficiently resilient graphs. We also analyze the corresponding notion of resilience for $k$-SAT. This notion of resilience suggests an array of open questions for graph coloring and other combinatorial problems.
[ { "created": "Tue, 18 Feb 2014 15:50:15 GMT", "version": "v1" }, { "created": "Wed, 11 Jun 2014 22:20:46 GMT", "version": "v2" } ]
2014-06-13
[ [ "Kun", "Jeremy", "" ], [ "Reyzin", "Lev", "" ] ]
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1402.4380
Samuel Danso
Samuel Danso, Eric Atwell and Owen Johnson
A Comparative Study of Machine Learning Methods for Verbal Autopsy Text Classification
10 pages
International Journal of Computer Science Issues, Volume 10, Issue 6, No 2, November 2013
null
null
cs.CL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A Verbal Autopsy is the record of an interview about the circumstances of an uncertified death. In developing countries, if a death occurs away from health facilities, a field-worker interviews a relative of the deceased about the circumstances of the death; this Verbal Autopsy can be reviewed off-site. We report on a comparative study of the processes involved in Text Classification applied to classifying Cause of Death: feature value representation; machine learning classification algorithms; and feature reduction strategies in order to identify the suitable approaches applicable to the classification of Verbal Autopsy text. We demonstrate that normalised term frequency and the standard TFiDF achieve comparable performance across a number of classifiers. The results also show Support Vector Machine is superior to other classification algorithms employed in this research. Finally, we demonstrate the effectiveness of employing a "locally-semi-supervised" feature reduction strategy in order to increase performance accuracy.
[ { "created": "Tue, 18 Feb 2014 16:02:05 GMT", "version": "v1" } ]
2014-02-19
[ [ "Danso", "Samuel", "" ], [ "Atwell", "Eric", "" ], [ "Johnson", "Owen", "" ] ]
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1402.4381
Hung Nien
Hung Nien and Jeffrey A. Fessler
Fast X-ray CT image reconstruction using the linearized augmented Lagrangian method with ordered subsets
21 pages (including the supplementary material), 12 figures, submitted to IEEE Trans. Med. Imag
IEEE Trans. Medical Imaging, 34(2):388-99, Feb. 2015
10.1109/TMI.2014.2358499
null
math.OC cs.LG stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The augmented Lagrangian (AL) method that solves convex optimization problems with linear constraints has drawn more attention recently in imaging applications due to its decomposable structure for composite cost functions and empirical fast convergence rate under weak conditions. However, for problems such as X-ray computed tomography (CT) image reconstruction and large-scale sparse regression with "big data", where there is no efficient way to solve the inner least-squares problem, the AL method can be slow due to the inevitable iterative inner updates. In this paper, we focus on solving regularized (weighted) least-squares problems using a linearized variant of the AL method that replaces the quadratic AL penalty term in the scaled augmented Lagrangian with its separable quadratic surrogate (SQS) function, thus leading to a much simpler ordered-subsets (OS) accelerable splitting-based algorithm, OS-LALM, for X-ray CT image reconstruction. To further accelerate the proposed algorithm, we use a second-order recursive system analysis to design a deterministic downward continuation approach that avoids tedious parameter tuning and provides fast convergence. Experimental results show that the proposed algorithm significantly accelerates the "convergence" of X-ray CT image reconstruction with negligible overhead and greatly reduces the OS artifacts in the reconstructed image when using many subsets for OS acceleration.
[ { "created": "Tue, 18 Feb 2014 16:02:36 GMT", "version": "v1" } ]
2015-11-30
[ [ "Nien", "Hung", "" ], [ "Fessler", "Jeffrey A.", "" ] ]
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1402.4382
Enderalp Yakaboylu
Enderalp Yakaboylu, Michael Klaiber, and Karen Z. Hatsagortsyan
The Wigner time delay for laser induced tunnel-ionization via the electron propagator
5 pages, 4 figures
Phys. Rev. A 90, 012116 (2014)
10.1103/PhysRevA.90.012116
null
quant-ph physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Recent attoclock experiments using the attsecond angular streaking technique enabled the measurement of the tunneling time delay during laser induced strong field ionization. Theoretically the tunneling time delay is commonly modelled by the Wigner time delay concept which is derived from the derivative of the electron wave function phase with respect to energy. Here, we present an alternative method for the calculation of the Wigner time delay by using the fixed energy propagator. The developed formalism is applied to the nonrelativistic as well as to the relativistic regime of the tunnel-ionization process from a zero-range potential, where in the latter regime the propagator can be given by means of the proper-time method.
[ { "created": "Tue, 18 Feb 2014 16:07:31 GMT", "version": "v1" } ]
2015-05-19
[ [ "Yakaboylu", "Enderalp", "" ], [ "Klaiber", "Michael", "" ], [ "Hatsagortsyan", "Karen Z.", "" ] ]
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1402.4385
Tatsuro Kawamoto
Tatsuro Kawamoto and Martin Rosvall
Estimating the resolution limit of the map equation in community detection
12 pages, 7 figures
Phys. Rev. E 91, 012809 (2015)
10.1103/PhysRevE.91.012809
null
physics.soc-ph cs.SI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A community detection algorithm is considered to have a resolution limit if the scale of the smallest modules that can be resolved depends on the size of the analyzed subnetwork. The resolution limit is known to prevent some community detection algorithms from accurately identifying the modular structure of a network. In fact, any global objective function for measuring the quality of a two-level assignment of nodes into modules must have some sort of resolution limit or an external resolution parameter. However, it is yet unknown how the resolution limit affects the so-called map equation, which is known to be an efficient objective function for community detection. We derive an analytical estimate and conclude that the resolution limit of the map equation is set by the total number of links between modules instead of the total number of links in the full network as for modularity. This mechanism makes the resolution limit much less restrictive for the map equation than for modularity, and in practice orders of magnitudes smaller. Furthermore, we argue that the effect of the resolution limit often results from shoehorning multi-level modular structures into two-level descriptions. As we show, the hierarchical map equation effectively eliminates the resolution limit for networks with nested multi-level modular structures.
[ { "created": "Tue, 18 Feb 2014 16:23:12 GMT", "version": "v1" }, { "created": "Fri, 24 Oct 2014 16:11:48 GMT", "version": "v2" }, { "created": "Wed, 14 Jan 2015 11:16:25 GMT", "version": "v3" } ]
2015-06-18
[ [ "Kawamoto", "Tatsuro", "" ], [ "Rosvall", "Martin", "" ] ]
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1402.4386
Jian-Jun Shu
Jian-Jun Shu and Graham Wilks
Heat transfer in the flow of a cold, axisymmetric vertical liquid jet against a hot, horizontal plate
null
Journal of Heat Transfer-Transactions of the ASME, Vol. 130, No. 1, pp. 012202, 2008
10.1115/1.2780180
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The paper considers heat transfer characteristics of thin film flow over a hot horizontal flat plate resulting from a cold vertical jet of liquid falling onto the surface. A numerical solution of high accuracy is obtained for large Reynolds numbers using the modified Keller box method. For the flat plate, solutions for axisymmetric jets are obtained. In a parallel approximation theory an advanced polynomial approximation for the velocity and temperature distribution is employed and results are good agreement with those obtained using a simple Pohlhausen polynomial and the numerical solutions.
[ { "created": "Tue, 18 Feb 2014 16:23:38 GMT", "version": "v1" }, { "created": "Fri, 7 Mar 2014 14:53:42 GMT", "version": "v2" }, { "created": "Mon, 10 Mar 2014 12:14:24 GMT", "version": "v3" } ]
2014-03-11
[ [ "Shu", "Jian-Jun", "" ], [ "Wilks", "Graham", "" ] ]
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1402.4387
Jian-Jun Shu
Jian-Jun Shu
Transient free-surface waves due to impulsive motion of a submerged source
null
Underwater Technology, Vol. 26, No. 4, pp. 133-137, 2006
10.3723/175605406782725023
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The problem of a viscous flow past a submerged source starting from rest and moving with a constant velocity, below and parallel to a free surface is examined. Asymptotic expressions for long-time evolution of free-surface elevation are obtained. The results show explicitly the viscous effect on the free-surface elevation and no surface tension effect on the asymptotic wave.
[ { "created": "Tue, 18 Feb 2014 16:30:06 GMT", "version": "v1" }, { "created": "Tue, 4 Mar 2014 13:47:50 GMT", "version": "v2" }, { "created": "Wed, 5 Mar 2014 10:53:57 GMT", "version": "v3" } ]
2014-03-06
[ [ "Shu", "Jian-Jun", "" ] ]
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1402.4388
Mohammed Javed
Mohammed Javed, P. Nagabhushan, B.B. Chaudhuri
Automatic Detection of Font Size Straight from Run Length Compressed Text Documents
8 Pages
(IJCSIT) International Journal of Computer Science and Information Technologies, Vol. 5 (1) , 2014, 818-825
null
null
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Automatic detection of font size finds many applications in the area of intelligent OCRing and document image analysis, which has been traditionally practiced over uncompressed documents, although in real life the documents exist in compressed form for efficient storage and transmission. It would be novel and intelligent if the task of font size detection could be carried out directly from the compressed data of these documents without decompressing, which would result in saving of considerable amount of processing time and space. Therefore, in this paper we present a novel idea of learning and detecting font size directly from run-length compressed text documents at line level using simple line height features, which paves the way for intelligent OCRing and document analysis directly from compressed documents. In the proposed model, the given mixed-case text documents of different font size are segmented into compressed text lines and the features extracted such as line height and ascender height are used to capture the pattern of font size in the form of a regression line, using which the automatic detection of font size is done during the recognition stage. The method is experimented with a dataset of 50 compressed documents consisting of 780 text lines of single font size and 375 text lines of mixed font size resulting in an overall accuracy of 99.67%.
[ { "created": "Tue, 18 Feb 2014 16:30:59 GMT", "version": "v1" } ]
2014-02-19
[ [ "Javed", "Mohammed", "" ], [ "Nagabhushan", "P.", "" ], [ "Chaudhuri", "B. B.", "" ] ]
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1402.4391
Jian-Jun Shu
Jian-Jun Shu
Prediction and analysis of tides and tidal currents
null
International Hydrographic Review, Vol. 4, No. 2, pp. 24-29, 2003
null
null
physics.flu-dyn physics.ao-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
An efficient algorithm of tidal harmonic analysis and prediction is presented in this paper. Some conditions are found by means of the known approximate relationships between the harmonic constants of the tidal constituents. A system of linear equations for least squares solutions under these restricted conditions is obtained. In the case of inadequate data, ill conditioning in the system of equations that has appeared in other algorithms is conveniently avoided. In solving the resultant normal equations, the Goertzel iteration is adopted so that the whole computation time is dramatically reduced.
[ { "created": "Tue, 18 Feb 2014 16:37:31 GMT", "version": "v1" }, { "created": "Sun, 9 Mar 2014 14:43:02 GMT", "version": "v2" } ]
2014-03-11
[ [ "Shu", "Jian-Jun", "" ] ]
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1402.4393
Pierre-Philippe Dechant
Pierre-Philippe Dechant, Jess Wardman, Tom Keef and Reidun Twarock
Viruses and Fullerenes - Symmetry as a Common Thread?
15 pages, 7 figures; Accepted by Acta Crystallographica A, cover article March 2014
Acta Crystallographica A70, 162-167 (2014)
10.1107/S2053273313034220
DCPT-14/05
math-ph cond-mat.other math.MP physics.bio-ph physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We apply here the principle of affine symmetry to the nested fullerene cages (carbon onions) that arise in the context of carbon chemistry. Previous work on affine extensions of the icosahedral group has revealed a new organisational principle in virus structure and assembly. We adapt this group theoretic framework here to the physical requirements dictated by carbon chemistry, and show that we can derive mathematical models for carbon onions within this affine symmetry approach. This suggests the applicability of affine symmetry in a wider context in Nature, as well as offering a novel perspective on the geometric principles underpinning carbon chemistry.
[ { "created": "Tue, 18 Feb 2014 16:42:09 GMT", "version": "v1" } ]
2016-07-13
[ [ "Dechant", "Pierre-Philippe", "" ], [ "Wardman", "Jess", "" ], [ "Keef", "Tom", "" ], [ "Twarock", "Reidun", "" ] ]
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1402.4395
Pascual Mu\~noz
Bernardo Gargallo and Pascual Mu\~noz
Novel layout for reflective arrayed waveguide gratings based on Sagnac loop reflectors with custom spectral response
null
null
10.1364/OE.22.014348
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A novel layout for a reflective Arrayed Waveguide Grating is presented in this paper. The device consists of one half of a regular AWG where each arm waveguide in the array is terminated with a phase shifter and a Sagnac loop reflector. The theoretical model to describe and design the spectral response of this device is derivated. By individually adjusting the phase shifter and Sagnac reflectivity in each arm, this layout allows for tailoring the spectral response of the AWG. Design cases of Silicon-on-Insulator AWG devices with Gaussian and flattened response are provided.
[ { "created": "Tue, 18 Feb 2014 16:43:30 GMT", "version": "v1" } ]
2015-06-18
[ [ "Gargallo", "Bernardo", "" ], [ "Muñoz", "Pascual", "" ] ]
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1402.4410
Paniz Alipour Aghdam
Paniz Alipour Aghdam and Reza Ravanmehr
A Novel Approach for Canvas Accessibility Problem in HTML5
9 pages,8 Figures
IJCSI International Journal of Computer Science Issues, Vol 10, 2013, Page 116
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null
cs.HC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Canvas is a pixel-based inherently inaccessible element in HTML5.Therefore web users with vision disabilities cannot benefit from Canvas and its desired semantics and functionality. Regarding to the Canvas application in designing interactive graphical user interface, vision-impaired users may miss important information on web sites. This paper utilizes the content-based image retrieval (CBIR) technique as well as code mapping embedded in a Firefox extension to present a novel approach in order to make Canvas interactive user interface accessible. This extension replaces Canvas with an accessible equivalent HTML environment. Unlike previously done works on Canvas accessibility, the proposed approach does not impose any rules on developers and designers during Canvas design.
[ { "created": "Tue, 18 Feb 2014 17:36:58 GMT", "version": "v1" } ]
2014-02-19
[ [ "Aghdam", "Paniz Alipour", "" ], [ "Ravanmehr", "Reza", "" ] ]
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1402.4413
Marijn Heule
Shai Haim and Marijn Heule
Towards Ultra Rapid Restarts
null
null
null
null
cs.AI cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We observe a trend regarding restart strategies used in SAT solvers. A few years ago, most state-of-the-art solvers restarted on average after a few thousands of backtracks. Currently, restarting after a dozen backtracks results in much better performance. The main reason for this trend is that heuristics and data structures have become more restart-friendly. We expect further continuation of this trend, so future SAT solvers will restart even more rapidly. Additionally, we present experimental results to support our observations.
[ { "created": "Tue, 18 Feb 2014 17:39:39 GMT", "version": "v1" } ]
2014-02-19
[ [ "Haim", "Shai", "" ], [ "Heule", "Marijn", "" ] ]
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1402.4414
Dusko Pavlovic
Dusko Pavlovic and Bertfried Fauser
Smooth coalgebra: testing vector analysis
45 pages, 25 figures; to appear in Math. Struct. in Comp. Sci.; this version: affiliations updated, typos corrected
null
10.1017/S0960129515000511
null
math.CT cs.LO math.FA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Processes are often viewed as coalgebras, with the structure maps specifying the state transitions. In the simplest case, the state spaces are discrete, and the structure map simply takes each state to the next states. But the coalgebraic view is also quite effective for studying processes over structured state spaces, e.g. measurable, or continuous. In the present paper we consider coalgebras over manifolds. This means that the captured processes evolve over state spaces that are not just continuous, but also locally homeomorphic to Banach spaces, and thus carry a differential structure. Both dynamical systems and differential forms arise as coalgebras over such state spaces, for two different endofunctors over manifolds. A duality induced by these two endofunctors provides a formal underpinning for the informal geometric intuitions linking differential forms and dynamical systems in the various practical applications, e.g. in physics. This joint functorial reconstruction of tangent bundles and cotangent bundles uncovers the universal properties and a high level view of these fundamental structures, which are implemented rather intricately in their standard form. The succinct coalgebraic presentation provides unexpected insights even about the situations as familiar as Newton's laws.
[ { "created": "Tue, 18 Feb 2014 17:40:05 GMT", "version": "v1" }, { "created": "Thu, 22 May 2014 17:30:33 GMT", "version": "v2" } ]
2015-12-23
[ [ "Pavlovic", "Dusko", "" ], [ "Fauser", "Bertfried", "" ] ]
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1402.4417
Pankaj Malhotra
Pankaj Malhotra, Puneet Agarwal, Gautam Shroff
Incremental Entity Resolution from Linked Documents
15 pages, 8 figures, patented work
null
null
TR-DAIF-2014-1
cs.DB cs.IR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In many government applications we often find that information about entities, such as persons, are available in disparate data sources such as passports, driving licences, bank accounts, and income tax records. Similar scenarios are commonplace in large enterprises having multiple customer, supplier, or partner databases. Each data source maintains different aspects of an entity, and resolving entities based on these attributes is a well-studied problem. However, in many cases documents in one source reference those in others; e.g., a person may provide his driving-licence number while applying for a passport, or vice-versa. These links define relationships between documents of the same entity (as opposed to inter-entity relationships, which are also often used for resolution). In this paper we describe an algorithm to cluster documents that are highly likely to belong to the same entity by exploiting inter-document references in addition to attribute similarity. Our technique uses a combination of iterative graph-traversal, locality-sensitive hashing, iterative match-merge, and graph-clustering to discover unique entities based on a document corpus. A unique feature of our technique is that new sets of documents can be added incrementally while having to re-resolve only a small subset of a previously resolved entity-document collection. We present performance and quality results on two data-sets: a real-world database of companies and a large synthetically generated `population' database. We also demonstrate benefit of using inter-document references for clustering in the form of enhanced recall of documents for resolution.
[ { "created": "Tue, 18 Feb 2014 17:45:31 GMT", "version": "v1" } ]
2014-02-19
[ [ "Malhotra", "Pankaj", "" ], [ "Agarwal", "Puneet", "" ], [ "Shroff", "Gautam", "" ] ]
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1402.4419
Julien Mairal
Julien Mairal (INRIA Grenoble Rh\^one-Alpes / LJK Laboratoire Jean Kuntzmann)
Incremental Majorization-Minimization Optimization with Application to Large-Scale Machine Learning
to appear in SIAM Journal on Optimization; final author's version
null
null
null
math.OC cs.LG stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Majorization-minimization algorithms consist of successively minimizing a sequence of upper bounds of the objective function. These upper bounds are tight at the current estimate, and each iteration monotonically drives the objective function downhill. Such a simple principle is widely applicable and has been very popular in various scientific fields, especially in signal processing and statistics. In this paper, we propose an incremental majorization-minimization scheme for minimizing a large sum of continuous functions, a problem of utmost importance in machine learning. We present convergence guarantees for non-convex and convex optimization when the upper bounds approximate the objective up to a smooth error; we call such upper bounds "first-order surrogate functions". More precisely, we study asymptotic stationary point guarantees for non-convex problems, and for convex ones, we provide convergence rates for the expected objective function value. We apply our scheme to composite optimization and obtain a new incremental proximal gradient algorithm with linear convergence rate for strongly convex functions. In our experiments, we show that our method is competitive with the state of the art for solving machine learning problems such as logistic regression when the number of training samples is large enough, and we demonstrate its usefulness for sparse estimation with non-convex penalties.
[ { "created": "Tue, 18 Feb 2014 17:50:30 GMT", "version": "v1" }, { "created": "Thu, 2 Oct 2014 19:39:32 GMT", "version": "v2" }, { "created": "Sun, 1 Feb 2015 07:20:36 GMT", "version": "v3" } ]
2015-02-03
[ [ "Mairal", "Julien", "", "INRIA Grenoble Rhône-Alpes / LJK Laboratoire Jean\n Kuntzmann" ] ]
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1402.4422
L\'aszl\'o Varga
L\'aszl\'o Varga
Combinatorial Nullstellensatz modulo prime powers and the Parity Argument
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null
null
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math.CO cs.CC math.NT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present new generalizations of Olson's theorem and of a consequence of Alon's Combinatorial Nullstellensatz. These enable us to extend some of their combinatorial applications with conditions modulo primes to conditions modulo prime powers. We analyze computational search problems corresponding to these kinds of combinatorial questions and we prove that the problem of finding degree-constrained subgraphs modulo $2^d$ such as $2^d$-divisible subgraphs and the search problem corresponding to the Combinatorial Nullstellensatz over $\mathbb{F}_2$ belong to the complexity class Polynomial Parity Argument (PPA).
[ { "created": "Tue, 18 Feb 2014 18:01:15 GMT", "version": "v1" } ]
2014-02-19
[ [ "Varga", "László", "" ] ]
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1402.4423
Farshad Merrikh Bayat
Mohammad Jamadi and Farshad Merrikh-Bayat
New Method for Accurate Parameter Estimation of Induction Motors Based on Artificial Bee Colony Algorithm
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cs.SY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper proposes an effective method for estimating the parameters of double-cage induction motors by using Artificial Bee Colony (ABC) algorithm. For this purpose the unknown parameters in the electrical model of asynchronous machine are calculated such that the sum of the square of differences between full load torques, starting torques, maximum torques, starting currents, full load currents, and nominal power factors obtained from model and provided by manufacturer is minimized. In order to confirm the efficiency of the proposed method the results are also compared with those achieved by using GA, PSO, and PAMP. The simulations show that in the problem under consideration ABC converges considerably faster than other algorithms and the results are as accurate as PAMP.
[ { "created": "Tue, 18 Feb 2014 18:03:05 GMT", "version": "v1" } ]
2014-02-19
[ [ "Jamadi", "Mohammad", "" ], [ "Merrikh-Bayat", "Farshad", "" ] ]
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1402.4437
Taco Cohen
Taco Cohen, Max Welling
Learning the Irreducible Representations of Commutative Lie Groups
null
Proceedings of the International Conference on Machine Learning, 2014
null
null
cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a new probabilistic model of compact commutative Lie groups that produces invariant-equivariant and disentangled representations of data. To define the notion of disentangling, we borrow a fundamental principle from physics that is used to derive the elementary particles of a system from its symmetries. Our model employs a newfound Bayesian conjugacy relation that enables fully tractable probabilistic inference over compact commutative Lie groups -- a class that includes the groups that describe the rotation and cyclic translation of images. We train the model on pairs of transformed image patches, and show that the learned invariant representation is highly effective for classification.
[ { "created": "Tue, 18 Feb 2014 18:47:41 GMT", "version": "v1" }, { "created": "Sun, 25 May 2014 12:21:34 GMT", "version": "v2" } ]
2019-04-23
[ [ "Cohen", "Taco", "" ], [ "Welling", "Max", "" ] ]
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1402.4439
Antonio Giorgilli
Antonio Giorgilli
A Kepler's note on secular inequalities
null
null
null
null
physics.hist-ph math-ph math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
I discuss the problem of secular inequalities in Kepler by giving account of a manuscript note that has not been published until 1860. In his note Kepler points out the need for a model, clearly inspired by the method of epicycles, that describes the secular inequalities as periodic ones. I bring attention to this point, that seems to have been underestimated, since the references to Kepler's work usually report only that he observed a decreasing mean motion for Saturn and an increasing one for Jupiter.
[ { "created": "Thu, 13 Feb 2014 21:04:42 GMT", "version": "v1" } ]
2014-02-19
[ [ "Giorgilli", "Antonio", "" ] ]
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1402.4442
Donia El Kateb
Donia El Kateb (SnT), Fran\c{c}ois Fouquet (SnT), Johann Bourcier (INRIA - IRISA), Yves Le Traon (SnT, CSC)
Artificial Mutation inspired Hyper-heuristic for Runtime Usage of Multi-objective Algorithms
null
null
null
null
cs.SE cs.NE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In the last years, multi-objective evolutionary algorithms (MOEA) have been applied to different software engineering problems where many conflicting objectives have to be optimized simultaneously. In theory, evolutionary algorithms feature a nice property for runtime optimization as they can provide a solution in any execution time. In practice, based on a Darwinian inspired natural selection, these evolutionary algorithms produce many deadborn solutions whose computation results in a computational resources wastage: natural selection is naturally slow. In this paper, we reconsider this founding analogy to accelerate convergence of MOEA, by looking at modern biology studies: artificial selection has been used to achieve an anticipated specific purpose instead of only relying on crossover and natural selection (i.e., Muller et al [18] research on artificial mutation of fruits with X-Ray). Putting aside the analogy with natural selection , the present paper proposes an hyper-heuristic for MOEA algorithms named Sputnik 1 that uses artificial selective mutation to improve the convergence speed of MOEA. Sputnik leverages the past history of mutation efficiency to select the most relevant mutations to perform. We evaluate Sputnik on a cloud-reasoning engine, which drives on-demand provisioning while considering conflicting performance and cost objectives. We have conducted experiments to highlight the significant performance improvement of Sputnik in terms of resolution time.
[ { "created": "Tue, 18 Feb 2014 19:09:23 GMT", "version": "v1" } ]
2014-02-19
[ [ "Kateb", "Donia El", "", "SnT" ], [ "Fouquet", "François", "", "SnT" ], [ "Bourcier", "Johann", "", "INRIA - IRISA" ], [ "Traon", "Yves Le", "", "SnT, CSC" ] ]
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1402.4450
Rui A. da Costa
R. A. da Costa, S. N. Dorogovtsev, A. V. Goltsev, J. F. F. Mendes
Critical exponents of the explosive percolation transition
7 pages, 4 figures
Phys. Rev. E 89, 042148 (2014)
10.1103/PhysRevE.89.042148
null
cond-mat.dis-nn math-ph math.MP physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In a new type of percolation phase transition, which was observed in a set of non-equilibrium models, each new connection between vertices is chosen from a number of possibilities by an Achlioptas-like algorithm. This causes preferential merging of small components and delays the emergence of the percolation cluster. First simulations led to a conclusion that a percolation cluster in this irreversible process is born discontinuously, by a discontinuous phase transition, which results in the term "explosive percolation transition". We have shown that this transition is actually continuous (second-order) though with an anomalously small critical exponent of the percolation cluster. Here we propose an efficient numerical method enabling us to find the critical exponents and other characteristics of this second order transition for a representative set of explosive percolation models with different number of choices. The method is based on gluing together the numerical solutions of evolution equations for the cluster size distribution and power-law asymptotics. For each of the models, with high precision, we obtain critical exponents and the critical point.
[ { "created": "Tue, 18 Feb 2014 19:47:27 GMT", "version": "v1" }, { "created": "Wed, 19 Feb 2014 20:41:55 GMT", "version": "v2" }, { "created": "Mon, 5 May 2014 16:54:07 GMT", "version": "v3" } ]
2015-06-18
[ [ "da Costa", "R. A.", "" ], [ "Dorogovtsev", "S. N.", "" ], [ "Goltsev", "A. V.", "" ], [ "Mendes", "J. F. F.", "" ] ]
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1402.4455
Marijn Heule
Sid Mijnders and Boris de Wilde and Marijn Heule
Symbiosis of Search and Heuristics for Random 3-SAT
Proceedings of the Third International Workshop on Logic and Search (LaSh 2010)
null
null
null
cs.DS cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
When combined properly, search techniques can reveal the full potential of sophisticated branching heuristics. We demonstrate this observation on the well-known class of random 3-SAT formulae. First, a new branching heuristic is presented, which generalizes existing work on this class. Much smaller search trees can be constructed by using this heuristic. Second, we introduce a variant of discrepancy search, called ALDS. Theoretical and practical evidence support that ALDS traverses the search tree in a near-optimal order when combined with the new heuristic. Both techniques, search and heuristic, have been implemented in the look-ahead solver march. The SAT 2009 competition results show that march is by far the strongest complete solver on random k-SAT formulae.
[ { "created": "Tue, 18 Feb 2014 19:59:58 GMT", "version": "v1" } ]
2014-02-19
[ [ "Mijnders", "Sid", "" ], [ "de Wilde", "Boris", "" ], [ "Heule", "Marijn", "" ] ]
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1402.4457
Michael Wood
M. P. Wood, J. E. Lawler, C. Sneden, J. J. Cowan
Improved Ni I log(gf) Values and Abundance Determinations in the Photospheres of the Sun and Metal-poor Star HD 84937
34 pages, 14 figures, 7 tables
ApJS 211 (2014) 20
10.1088/0067-0049/211/2/20
null
astro-ph.SR physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Atomic transition probability measurements for 371 Ni I lines in the UV through near IR are reported. Branching fractions from data recorded using a Fourier transform spectrometer and a new echelle spectrograph are combined with published radiative lifetimes to determine these transition probabilities. Generally good agreement is found in comparisons to previously reported Ni I transition probability measurements. Use of the new echelle spectrograph, independent radiometric calibration methods, and independent data analysis routines enable a reduction of systematic errors and overall improvement in transition probability uncertainty over previous measurements. The new Ni I data are applied to high resolution visible and UV spectra of the Sun and metal-poor star HD 84937 to derive new, more accurate Ni abundances. Lines covering a wide range of wavelength and excitation potential are used to search for non-LTE effects.
[ { "created": "Tue, 18 Feb 2014 20:05:59 GMT", "version": "v1" } ]
2014-03-28
[ [ "Wood", "M. P.", "" ], [ "Lawler", "J. E.", "" ], [ "Sneden", "C.", "" ], [ "Cowan", "J. J.", "" ] ]
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1402.4465
Marijn Heule
Peter van der Tak and Marijn J.H. Heule and Armin Biere
Concurrent Cube-and-Conquer
Third International Workshop on Pragmatics of SAT (PoS 2012)
null
null
null
cs.DS cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Recent work introduced the cube-and-conquer technique to solve hard SAT instances. It partitions the search space into cubes using a lookahead solver. Each cube is tackled by a conflict-driven clause learning (CDCL) solver. Crucial for strong performance is the cutoff heuristic that decides when to switch from lookahead to CDCL. Yet, this offline heuristic is far from ideal. In this paper, we present a novel hybrid solver that applies the cube and conquer steps simultaneously. A lookahead and a CDCL solver work together on each cube, while communication is restricted to synchronization. Our concurrent cube-and-conquer solver can solve many instances faster than pure lookahead, pure CDCL and offline cube-and-conquer, and can abort early in favor of a pure CDCL search if an instance is not suitable for cube-and-conquer techniques.
[ { "created": "Tue, 18 Feb 2014 20:39:30 GMT", "version": "v1" } ]
2014-02-19
[ [ "van der Tak", "Peter", "" ], [ "Heule", "Marijn J. H.", "" ], [ "Biere", "Armin", "" ] ]
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1402.4466
Daniel Lemire
Owen Kaser and Daniel Lemire
Compressed bitmap indexes: beyond unions and intersections
Accepted for publication in Software: Practice and Experience on August 14th 2014. Note that arXiv:1402.4073 [cs:DB] is a companion to this paper; while they share some text, each contains many results not in the other
Software: Practice & Experience 46 (2), 2016
10.1002/spe.2289
null
cs.DB cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Compressed bitmap indexes are used to speed up simple aggregate queries in databases. Indeed, set operations like intersections, unions and complements can be represented as logical operations (AND,OR,NOT) that are ideally suited for bitmaps. However, it is less obvious how to apply bitmaps to more advanced queries. For example, we might seek products in a store that meet some, but maybe not all, criteria. Such threshold queries generalize intersections and unions; they are often used in information-retrieval and data-mining applications. We introduce new algorithms that are sometimes three orders of magnitude faster than a naive approach. Our work shows that bitmap indexes are more broadly applicable than is commonly believed.
[ { "created": "Tue, 18 Feb 2014 20:41:33 GMT", "version": "v1" }, { "created": "Thu, 15 May 2014 18:28:14 GMT", "version": "v2" }, { "created": "Fri, 15 Aug 2014 13:45:47 GMT", "version": "v3" } ]
2016-01-11
[ [ "Kaser", "Owen", "" ], [ "Lemire", "Daniel", "" ] ]
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Compressed bitmap indexes: beyond unions and intersections
http://arxiv.org/abs/1402.4466v3
http://arxiv.org/pdf/1402.4466v3.pdf
https://github.com/sagpant/EWAHBoolArray
false
false
https://paperswithcode.com/paper/compressed-bitmap-indexes-beyond-unions-and
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1402.4467
Krysta Svore
Dave Wecker and Krysta M. Svore
LIQUi|>: A Software Design Architecture and Domain-Specific Language for Quantum Computing
14 pages, 12 figures, comments welcome
null
null
null
quant-ph cs.ET cs.PL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Languages, compilers, and computer-aided design tools will be essential for scalable quantum computing, which promises an exponential leap in our ability to execute complex tasks. LIQUi|> is a modular software architecture designed to control quantum hardware. It enables easy programming, compilation, and simulation of quantum algorithms and circuits, and is independent of a specific quantum architecture. LIQUi|> contains an embedded, domain-specific language designed for programming quantum algorithms, with F# as the host language. It also allows the extraction of a circuit data structure that can be used for optimization, rendering, or translation. The circuit can also be exported to external hardware and software environments. Two different simulation environments are available to the user which allow a trade-off between number of qubits and class of operations. LIQUi|> has been implemented on a wide range of runtimes as back-ends with a single user front-end. We describe the significant components of the design architecture and how to express any given quantum algorithm.
[ { "created": "Tue, 18 Feb 2014 20:46:01 GMT", "version": "v1" } ]
2014-02-20
[ [ "Wecker", "Dave", "" ], [ "Svore", "Krysta M.", "" ] ]
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LIQUi|>: A Software Design Architecture and Domain-Specific Language for Quantum Computing
http://arxiv.org/abs/1402.4467v1
http://arxiv.org/pdf/1402.4467v1.pdf
https://github.com/StationQ/Liquid
false
false
https://paperswithcode.com/paper/liqui-a-software-design-architecture-and
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1402.4474
Jian-Jun Shu
Jian-Jun Shu
Transient Marangoni waves due to impulsive motion of a submerged body
arXiv admin note: substantial text overlap with arXiv:1402.4387
International Applied Mechanics, Vol. 40, No. 6, pp. 709-714, 2004
10.1023/B:INAM.0000041400.70961.1b
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Oseen problem in a viscous fluid is formulated for studying the transient free-surface and Marangoni waves generated by the impulsive motion of a submerged body beneath a surface with surfactants. Wave asymptotics and wavefronts for large Reynolds numbers are obtained by employing Lighthill's two-stage scheme. The results obtained show explicitly the effects of viscosity and surfactants on Kelvin wakes.
[ { "created": "Tue, 18 Feb 2014 16:35:08 GMT", "version": "v1" }, { "created": "Mon, 3 Mar 2014 13:15:02 GMT", "version": "v2" } ]
2014-03-05
[ [ "Shu", "Jian-Jun", "" ] ]
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1402.4475
Prashant Shekhar
Prashant Shekhar and Zubin Jacob
Strong Coupling in Hyperbolic Metamaterials
9 pages, 5 figures
Phys.Rev.B vol. 90, no. 4, p. 045313, Jul. 2014. Phys. Rev. B 90 (2014) 045313
10.1103/PhysRevB.90.045313
null
physics.optics cond-mat.mes-hall
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Nanoscale light-matter interaction in the weak-coupling regime has been achieved with unique hyperbolic metamaterial modes possessing a high density of states. Here, we show strong coupling between intersubband transitions (ISBTs) of a multiple quantum well (MQW) slab and the bulk polariton modes of a hyperbolic metamaterial (HMM). These HMM modes have large wave vectors (high-k modes) and are normally evanescent in conventional materials. We analyze a metal-dielectric practical multilayer HMM structure consisting of a highly doped semiconductor acting as a metallic layer and an active multiple quantum well dielectric slab. We observe delocalized metamaterial mode interaction with the active materials distributed throughout the structure. Strong coupling and characteristic anticrossing with a maximum Rabi splitting (RS) energy of up to 52 meV is predicted between the high-k mode of the HMMand the ISBT, a value approximately 10.5 times greater than the ISBT linewidth and 4.5 times greater than the material loss of the structure. The scalability and tunability of the RS energy in an active semiconductor metamaterial device have potential applications in quantum well infrared photodetectors and intersubband light-emitting devices.
[ { "created": "Tue, 18 Feb 2014 18:33:09 GMT", "version": "v1" }, { "created": "Thu, 31 Jul 2014 17:20:57 GMT", "version": "v2" } ]
2014-08-01
[ [ "Shekhar", "Prashant", "" ], [ "Jacob", "Zubin", "" ] ]
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1402.4488
Jamie Morgenstern
Avrim Blum, Jamie Morgenstern, Ankit Sharma, Adam Smith
Privacy-Preserving Public Information for Sequential Games
null
null
null
null
cs.GT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In settings with incomplete information, players can find it difficult to coordinate to find states with good social welfare. For example, in financial settings, if a collection of financial firms have limited information about each other's strategies, some large number of them may choose the same high-risk investment in hopes of high returns. While this might be acceptable in some cases, the economy can be hurt badly if many firms make investments in the same risky market segment and it fails. One reason why many firms might end up choosing the same segment is that they do not have information about other firms' investments (imperfect information may lead to `bad' game states). Directly reporting all players' investments, however, raises confidentiality concerns for both individuals and institutions. In this paper, we explore whether information about the game-state can be publicly announced in a manner that maintains the privacy of the actions of the players, and still suffices to deter players from reaching bad game-states. We show that in many games of interest, it is possible for players to avoid these bad states with the help of privacy-preserving, publicly-announced information. We model behavior of players in this imperfect information setting in two ways -- greedy and undominated strategic behaviours, and we prove guarantees on social welfare that certain kinds of privacy-preserving information can help attain. Furthermore, we design a counter with improved privacy guarantees under continual observation.
[ { "created": "Tue, 18 Feb 2014 21:03:28 GMT", "version": "v1" }, { "created": "Fri, 29 Aug 2014 17:27:38 GMT", "version": "v2" } ]
2014-09-01
[ [ "Blum", "Avrim", "" ], [ "Morgenstern", "Jamie", "" ], [ "Sharma", "Ankit", "" ], [ "Smith", "Adam", "" ] ]
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1402.4496
Alan Bristow Alan Bristow
T. R. Senty, M. Yalamanchi, Y. Zhang, S. K. Cushing, M. S. Seehra, X. Shi, and A. D. Bristow
Photoluminescence spectroscopy of YVO$_{4}$:Eu$^{3+}$ nanoparticles with aromatic linker molecules: a precursor to biomedical functionalization
9 pages, 5 figures, journal article
J. Appl. Phys. 115, 163107 (2014)
10.1063/1.4874179
null
cond-mat.mtrl-sci cond-mat.mes-hall physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Photoluminescence spectra of YVO$_{4}$:Eu$^{3+}$ nanoparticles are presented,with and without the attachment of of organic linker molecules that are proposed for linking to biomolecules. YVO$_{4}$:Eu$^{3+}$ nanoparticles with 5% dopant concentration were synthesized by wet chemical synthesis. X-ray diffraction and transmission electron microscopy show the expected wakefieldite structure of tetragonal particles with an average size of 17 nm. Fourier-transform infrared spectroscopy determines that metal-carboxylate coordination is successful in replacing the native metal-hydroxyl bonds with three organic linkers, namely benzoic acid, 3-nitro 4-chloro-benzoic acid and 3,4-dihydroxybenzoic acid, in separate treatments. UV-excitation photoluminescence spectra show that the position and intensity of dominant $^{5}D_{0}-^{7}F_{2}$ electric-dipole transition at 619 nm is unaffected by the benzoic acid and 3-nitro 4-chloro-benzoic acid treatments. Attachment of the 3,4-dihydroxybenzoic acid produces an order-of-magnitude quenching of the photoluminescence, due to the presence of high-frequency modes in the linker. Ratios of the dominant electric- and magnetic-dipole transitions confirm infrared measurements, which indicate that the bulk crystal of the nanoparticle is unchanged by all three treatments.
[ { "created": "Tue, 18 Feb 2014 21:21:27 GMT", "version": "v1" }, { "created": "Tue, 6 May 2014 21:42:33 GMT", "version": "v2" } ]
2014-05-08
[ [ "Senty", "T. R.", "" ], [ "Yalamanchi", "M.", "" ], [ "Zhang", "Y.", "" ], [ "Cushing", "S. K.", "" ], [ "Seehra", "M. S.", "" ], [ "Shi", "X.", "" ], [ "Bristow", "A. D.", "" ] ]
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1402.4508
Noureddine Haouari
Haouari Noureddine, Moussaoui Samira
Efficient Local Density Estimation Strategy for VANETs
null
null
null
null
cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Local vehicle density estimation is increasingly becoming an essential factor of many vehicular ad-hoc network applications such as congestion control and traffic state estimation. This estimation is used to get an approximate number of neighbors within the transmission range since beacons do not give accurate accuracy about neighborhood. These is due to the special characteristics of VANETs such as high mobility, high density variation. To enhance the performance of these applications, an accurate estimation of the local density with minimum of overhead is needed. Most of the proposed strategies address the global traffic density estimation without a big attention on the local density estimation. This paper proposes an improved approach for local density estimation in VANETs in terms of accuracy and overhead. The simulation results showed that our strategy allows an interesting precision of estimation with acceptable overhead.
[ { "created": "Tue, 18 Feb 2014 21:54:03 GMT", "version": "v1" } ]
2014-02-20
[ [ "Noureddine", "Haouari", "" ], [ "Samira", "Moussaoui", "" ] ]
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1402.4511
Mauricio Bellini
Luis Santiago Ridao, Rodrigo Avalos, Mart\'in Daniel De Cicco (Department of Physics - UNMdP), Mauricio Bellini (IFIMAR - CONICET and UNMdP)
Perihelion advances for the orbits of Mercury, Earth and Pluto from Extended Theory of General Relativity (ETGR)
To be published in Can. J. Phys
null
null
null
physics.space-ph gr-qc
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We explore the geodesic movement on an effective four-dimensional hypersurface that is embedded in a five-dimensional Ricci-flat manifold described by a canonical metric, in order to applying to planetary orbits in our solar system. Some important solutions are given, which provide the standard solutions of general relativity without any extra force component. We study the perihelion advances of Mercury, the Earth and Pluto using the extended theory of general relativity (ETGR). Our results are in very good agreement with observations and show how the foliation is determinant to the value of the perihelion's advances. Possible applications are not limited to these kinds of orbits.
[ { "created": "Tue, 18 Feb 2014 22:03:22 GMT", "version": "v1" }, { "created": "Thu, 19 Jun 2014 16:13:50 GMT", "version": "v2" }, { "created": "Tue, 11 Nov 2014 21:34:13 GMT", "version": "v3" } ]
2014-11-13
[ [ "Ridao", "Luis Santiago", "", "Department of Physics - UNMdP" ], [ "Avalos", "Rodrigo", "", "Department of Physics - UNMdP" ], [ "De Cicco", "Martín Daniel", "", "Department of Physics - UNMdP" ], [ "Bellini", "Mauricio", "", "IFIMAR - CONICET and\n UNMdP" ] ]
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1402.4512
Nikhil Rao
Nikhil Rao, Robert Nowak, Christopher Cox and Timothy Rogers
Classification with Sparse Overlapping Groups
Tighter result compared to the previous version. Some additional details and justification on the problem being solved
null
null
null
cs.LG stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Classification with a sparsity constraint on the solution plays a central role in many high dimensional machine learning applications. In some cases, the features can be grouped together so that entire subsets of features can be selected or not selected. In many applications, however, this can be too restrictive. In this paper, we are interested in a less restrictive form of structured sparse feature selection: we assume that while features can be grouped according to some notion of similarity, not all features in a group need be selected for the task at hand. When the groups are comprised of disjoint sets of features, this is sometimes referred to as the "sparse group" lasso, and it allows for working with a richer class of models than traditional group lasso methods. Our framework generalizes conventional sparse group lasso further by allowing for overlapping groups, an additional flexiblity needed in many applications and one that presents further challenges. The main contribution of this paper is a new procedure called Sparse Overlapping Group (SOG) lasso, a convex optimization program that automatically selects similar features for classification in high dimensions. We establish model selection error bounds for SOGlasso classification problems under a fairly general setting. In particular, the error bounds are the first such results for classification using the sparse group lasso. Furthermore, the general SOGlasso bound specializes to results for the lasso and the group lasso, some known and some new. The SOGlasso is motivated by multi-subject fMRI studies in which functional activity is classified using brain voxels as features, source localization problems in Magnetoencephalography (MEG), and analyzing gene activation patterns in microarray data analysis. Experiments with real and synthetic data demonstrate the advantages of SOGlasso compared to the lasso and group lasso.
[ { "created": "Tue, 18 Feb 2014 22:08:50 GMT", "version": "v1" }, { "created": "Thu, 4 Sep 2014 16:53:19 GMT", "version": "v2" } ]
2014-09-05
[ [ "Rao", "Nikhil", "" ], [ "Nowak", "Robert", "" ], [ "Cox", "Christopher", "" ], [ "Rogers", "Timothy", "" ] ]
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1402.4513
Yangyang Liu
Yangyang Liu and Milo\v{s} A. Popovi\'c
High-Q Contacted Ring Microcavities with Scatterer-Avoiding "Wiggler" Bloch Wave Supermode Fields
null
null
10.1063/1.4878337
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
High-Q ring resonators with contacts to the waveguide core provide a versatile platform for various applications in chip-scale optomechanics, thermo- and electro-optics. We propose and demonstrate a novel approach to implement azimuthally periodic contacted ring resonators based on multi-mode Bloch matching that support contacts on both the inner and outer radius edges with small degradation to the optical Q. Radiative coupling between degenerate modes of adjacent transverse spatial order leads to imaginary frequency (Q) splitting and a scatterer avoiding high-Q "wiggler" supermode field. We experimentally measure Q's up to 258,000 in devices fabricated in a silicon device layer on buried oxide undercladding, and up to 139,000 in devices fully suspended in air using an undercut step. Wiggler supermodes are true modes of the microphotonic system that offer new degrees of freedom in electrical, thermal and mechanical design.
[ { "created": "Tue, 18 Feb 2014 22:11:16 GMT", "version": "v1" } ]
2015-06-18
[ [ "Liu", "Yangyang", "" ], [ "Popović", "Miloš A.", "" ] ]
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1402.4515
Trent Rogers
Jacob Hendricks, Matthew J. Patitz, Trent A. Rogers, and Scott M. Summers
The Power of Duples (in Self-Assembly): It's Not So Hip To Be Square
null
null
null
null
cs.ET cs.CC cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we define the Dupled abstract Tile Assembly Model (DaTAM), which is a slight extension to the abstract Tile Assembly Model (aTAM) that allows for not only the standard square tiles, but also "duple" tiles which are rectangles pre-formed by the joining of two square tiles. We show that the addition of duples allows for powerful behaviors of self-assembling systems at temperature 1, meaning systems which exclude the requirement of cooperative binding by tiles (i.e., the requirement that a tile must be able to bind to at least 2 tiles in an existing assembly if it is to attach). Cooperative binding is conjectured to be required in the standard aTAM for Turing universal computation and the efficient self-assembly of shapes, but we show that in the DaTAM these behaviors can in fact be exhibited at temperature 1. We then show that the DaTAM doesn't provide asymptotic improvements over the aTAM in its ability to efficiently build thin rectangles. Finally, we present a series of results which prove that the temperature-2 aTAM and temperature-1 DaTAM have mutually exclusive powers. That is, each is able to self-assemble shapes that the other can't, and each has systems which cannot be simulated by the other. Beyond being of purely theoretical interest, these results have practical motivation as duples have already proven to be useful in laboratory implementations of DNA-based tiles.
[ { "created": "Tue, 18 Feb 2014 22:23:27 GMT", "version": "v1" }, { "created": "Fri, 7 Mar 2014 00:52:37 GMT", "version": "v2" } ]
2014-03-10
[ [ "Hendricks", "Jacob", "" ], [ "Patitz", "Matthew J.", "" ], [ "Rogers", "Trent A.", "" ], [ "Summers", "Scott M.", "" ] ]
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1402.4516
Dmitry Savostyanov V.
D. V. Savostyanov, S. V. Dolgov, J. M. Werner, Ilya Kuprov
Exact NMR simulation of protein-size spin systems using tensor train formalism
Accepted for publication in Phys Rev B
Phys. Rev. B 90, 085139, 2014
10.1103/PhysRevB.90.085139
null
quant-ph math.NA physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We introduce a new method, based on alternating optimization, for compact representation of spin Hamiltonians and solution of linear systems of algebraic equations in the tensor train format. We demonstrate the method's utility by simulating, without approximations, a 15N NMR spectrum of ubiquitin --- a protein containing several hundred interacting nuclear spins. Existing simulation algorithms for the spin system and the NMR experiment in question either require significant approximations or scale exponentially with the spin system size. We compare the proposed method to the Spinach package that uses heuristic restricted state space techniques to achieve polynomial complexity scaling. When the spin system topology is close to a linear chain (e.g. for the backbone of a protein), the tensor train representation is more compact and can be computed faster than the sparse representation using restricted state spaces.
[ { "created": "Tue, 18 Feb 2014 22:25:59 GMT", "version": "v1" }, { "created": "Wed, 18 Jun 2014 16:08:45 GMT", "version": "v2" } ]
2014-08-28
[ [ "Savostyanov", "D. V.", "" ], [ "Dolgov", "S. V.", "" ], [ "Werner", "J. M.", "" ], [ "Kuprov", "Ilya", "" ] ]
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1402.4523
Sandro Meloni
Joaqu\'in Sanz, Cheng-Yi Xia, Sandro Meloni and Yamir Moreno
Dynamics of interacting diseases
24 pages, 9 figures, 4 tables, 3 appendices. Final version accepted for publication in Physical Review X
Phys. Rev. X 4, 041005 (2014)
null
null
physics.soc-ph cond-mat.stat-mech q-bio.PE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Current modeling of infectious diseases allows for the study of complex and realistic scenarios that go from the population to the individual level of description. However, most epidemic models assume that the spreading process takes place on a single level (be it a single population, a meta-population system or a network of contacts). In particular, interdependent contagion phenomena can only be addressed if we go beyond the scheme one pathogen-one network. In this paper, we propose a framework that allows describing the spreading dynamics of two concurrent diseases. Specifically, we characterize analytically the epidemic thresholds of the two diseases for different scenarios and also compute the temporal evolution characterizing the unfolding dynamics. Results show that there are regions of the parameter space in which the onset of a disease's outbreak is conditioned to the prevalence levels of the other disease. Moreover, we show, for the SIS scheme, that under certain circumstances, finite and not vanishing epidemic thresholds are found even at the thermodynamic limit for scale-free networks. For the SIR scenario, the phenomenology is richer and additional interdependencies show up. We also find that the secondary thresholds for the SIS and SIR models are different, which results directly from the interaction between both diseases. Our work thus solve an important problem and pave the way towards a more comprehensive description of the dynamics of interacting diseases.
[ { "created": "Tue, 18 Feb 2014 22:53:31 GMT", "version": "v1" }, { "created": "Wed, 30 Jul 2014 17:30:28 GMT", "version": "v2" } ]
2015-04-15
[ [ "Sanz", "Joaquín", "" ], [ "Xia", "Cheng-Yi", "" ], [ "Meloni", "Sandro", "" ], [ "Moreno", "Yamir", "" ] ]
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1402.4525
Saminda Abeyruwan
Saminda Abeyruwan and Andreas Seekircher and Ubbo Visser
Off-Policy General Value Functions to Represent Dynamic Role Assignments in RoboCup 3D Soccer Simulation
18 pages, 8 figures
null
null
null
cs.AI
http://creativecommons.org/licenses/by/3.0/
Collecting and maintaining accurate world knowledge in a dynamic, complex, adversarial, and stochastic environment such as the RoboCup 3D Soccer Simulation is a challenging task. Knowledge should be learned in real-time with time constraints. We use recently introduced Off-Policy Gradient Descent algorithms within Reinforcement Learning that illustrate learnable knowledge representations for dynamic role assignments. The results show that the agents have learned competitive policies against the top teams from the RoboCup 2012 competitions for three vs three, five vs five, and seven vs seven agents. We have explicitly used subsets of agents to identify the dynamics and the semantics for which the agents learn to maximize their performance measures, and to gather knowledge about different objectives, so that all agents participate effectively and efficiently within the group.
[ { "created": "Tue, 18 Feb 2014 23:01:13 GMT", "version": "v1" } ]
2014-02-20
[ [ "Abeyruwan", "Saminda", "" ], [ "Seekircher", "Andreas", "" ], [ "Visser", "Ubbo", "" ] ]
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Off-Policy General Value Functions to Represent Dynamic Role Assignments in RoboCup 3D Soccer Simulation
http://arxiv.org/abs/1402.4525v1
http://arxiv.org/pdf/1402.4525v1.pdf
https://github.com/samindaa/RLLib
true
true
https://paperswithcode.com/paper/off-policy-general-value-functions-to
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1402.4528
Babak Nikfal
Babak Nikfal, Qingfeng Zhang, Christophe Caloz
Enhanced-SNR Impulse Radio Transceiver based on Phasers
null
null
null
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The concept of SNR enhancement in impulse radio transceivers based on phasers of opposite chirping slopes is introduced. It is shown that signal to-noise radio (SNR) enhancements by factors M2 and M are achieved for burst noise and Gaussian noise, respectively, where M is the stretching factor of the phasers. An experimental demonstration is presented, using stripline cascaded C-section phasers, where SNR enhancements in agreement with theory are obtained. The proposed radio analog signal processing transceiver system is simple, low-cost and frequency scalable, and may therefore be suitable for broadband impulse radio ranging and communication applications.
[ { "created": "Tue, 18 Feb 2014 23:38:56 GMT", "version": "v1" } ]
2014-02-20
[ [ "Nikfal", "Babak", "" ], [ "Zhang", "Qingfeng", "" ], [ "Caloz", "Christophe", "" ] ]
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1402.4535
Shaddin Dughmi
Shaddin Dughmi, Li Han, Noam Nisan
Sampling and Representation Complexity of Revenue Maximization
null
null
null
null
cs.GT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider (approximate) revenue maximization in auctions where the distribution on input valuations is given via "black box" access to samples from the distribution. We observe that the number of samples required -- the sample complexity -- is tightly related to the representation complexity of an approximately revenue-maximizing auction. Our main results are upper bounds and an exponential lower bound on these complexities.
[ { "created": "Wed, 19 Feb 2014 00:31:32 GMT", "version": "v1" }, { "created": "Thu, 3 Apr 2014 05:57:57 GMT", "version": "v2" } ]
2014-04-04
[ [ "Dughmi", "Shaddin", "" ], [ "Han", "Li", "" ], [ "Nisan", "Noam", "" ] ]
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1402.4536
Bo Jiang
Bo Jiang, Liyuan Sun, Daniel R. Figueiredo, Bruno Ribeiro, Don Towsley
On the duration and intensity of cumulative advantage competitions
null
null
10.1088/1742-5468/2015/11/P11022
null
physics.soc-ph q-bio.PE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The role of skill (fitness) and luck (randomness) as driving forces on the dynamics of resource accumulation in a myriad of systems have long puzzled scientists. Fueled by undisputed inequalities that emerge from actual competitions, there is a pressing need for better understanding the effects of skill and luck in resource accumulation. When such competitions are driven by externalities such as cumulative advantage (CA), the rich-get-richer effect, little is known with respect to fundamental properties such as their duration and intensity. In this work we provide a mathematical understanding of how CA exacerbates the role of luck in detriment of skill in simple and well-studied competition models. We show, for instance, that if two agents are competing for resources that arrive sequentially at each time unit, an early stroke of luck can place the less skilled in the lead for an extremely long period of time, a phenomenon we call "struggle of the fittest". In the absence of CA, the more skilled quickly prevails despite any early stroke of luck that the less skilled may have. We prove that duration of a simple skill and luck competition model exhibit power law tails when CA is present, regardless of skill difference, which is in sharp contrast to exponential tails when CA is absent. Our findings have important implications to competitions not only in complex social systems but also in contexts that leverage such models.
[ { "created": "Wed, 19 Feb 2014 00:31:33 GMT", "version": "v1" }, { "created": "Sun, 14 Dec 2014 01:07:36 GMT", "version": "v2" } ]
2015-12-09
[ [ "Jiang", "Bo", "" ], [ "Sun", "Liyuan", "" ], [ "Figueiredo", "Daniel R.", "" ], [ "Ribeiro", "Bruno", "" ], [ "Towsley", "Don", "" ] ]
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1402.4540
Jeff Alstott
Jeff Alstott, Pietro Panzarasa, Mikail Rubinov, Ed Bullmore, Petra Vertes
A Unifying Framework for Measuring Weighted Rich Clubs
6 pages, 3 figures
Scientific Reports 4, 2014. Article number: 7258
10.1038/srep07258
null
physics.soc-ph cs.SI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Network analysis can help uncover meaningful regularities in the organization of complex systems. Among these, rich clubs are a functionally important property of a variety of social, technological and biological networks. Rich clubs emerge when nodes that are somehow prominent or 'rich' (e.g., highly connected) interact preferentially with one another. The identification of rich clubs is non-trivial, especially in weighted networks, and to this end multiple distinct metrics have been proposed. Here we describe a unifying framework for detecting rich clubs which intuitively generalizes various metrics into a single integrated method. This generalization rests upon the explicit incorporation of randomized control networks into the measurement process. We apply this framework to real-life examples, and show that, depending on the selection of randomized controls, different kinds of rich-club structures can be detected, such as topological and weighted rich clubs.
[ { "created": "Wed, 19 Feb 2014 01:28:07 GMT", "version": "v1" }, { "created": "Tue, 2 Dec 2014 03:27:16 GMT", "version": "v2" } ]
2014-12-03
[ [ "Alstott", "Jeff", "" ], [ "Panzarasa", "Pietro", "" ], [ "Rubinov", "Mikail", "" ], [ "Bullmore", "Ed", "" ], [ "Vertes", "Petra", "" ] ]
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1402.4542
Chunguo Li
Chun-Guo Li, Xing Mei, Bao-Gang Hu
Unsupervised Ranking of Multi-Attribute Objects Based on Principal Curves
This paper has 14 pages and 9 figures. The paper has submitted to IEEE Transactions on Knowledge and Data Engineering (TKDE)
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cs.LG cs.AI stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Unsupervised ranking faces one critical challenge in evaluation applications, that is, no ground truth is available. When PageRank and its variants show a good solution in related subjects, they are applicable only for ranking from link-structure data. In this work, we focus on unsupervised ranking from multi-attribute data which is also common in evaluation tasks. To overcome the challenge, we propose five essential meta-rules for the design and assessment of unsupervised ranking approaches: scale and translation invariance, strict monotonicity, linear/nonlinear capacities, smoothness, and explicitness of parameter size. These meta-rules are regarded as high level knowledge for unsupervised ranking tasks. Inspired by the works in [8] and [14], we propose a ranking principal curve (RPC) model, which learns a one-dimensional manifold function to perform unsupervised ranking tasks on multi-attribute observations. Furthermore, the RPC is modeled to be a cubic B\'ezier curve with control points restricted in the interior of a hypercube, thereby complying with all the five meta-rules to infer a reasonable ranking list. With control points as the model parameters, one is able to understand the learned manifold and to interpret the ranking list semantically. Numerical experiments of the presented RPC model are conducted on two open datasets of different ranking applications. In comparison with the state-of-the-art approaches, the new model is able to show more reasonable ranking lists.
[ { "created": "Wed, 19 Feb 2014 01:29:14 GMT", "version": "v1" } ]
2014-02-20
[ [ "Li", "Chun-Guo", "" ], [ "Mei", "Xing", "" ], [ "Hu", "Bao-Gang", "" ] ]
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1402.4543
Boyu Li
Dengkui Zhu, Boyu Li, Ping Liang
Normalized Volume of Hyperball in Complex Grassmann Manifold and Its Application in Large-Scale MU-MIMO Communication Systems
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null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper provides a solution to a critical issue in large-scale Multi-User Multiple-Input Multiple-Output (MU-MIMO) communication systems: how to estimate the Signal-to-Interference-plus-Noise-Ratios (SINRs) and their expectations in MU-MIMO mode at the Base Station (BS) side when only the Channel Quality Information (CQI) in Single-User MIMO (SU-MIMO) mode and non-ideal Channel State Information (CSI) are known? A solution to this problem would be very beneficial for the BS to predict the capacity of MU-MIMO and choose the proper modulation and channel coding for MU-MIMO. To that end, this paper derives a normalized volume formula of a hyperball based on the probability density function of the canonical angle between any two points in a complex Grassmann manifold, and shows that this formula provides a solution to the aforementioned issue. It enables the capability of a BS to predict the capacity loss due to non-ideal CSI, group users in MU-MIMO mode, choose the proper modulation and channel coding, and adaptively switch between SU-MIMO and MU-MIMO modes, as well as between Conjugate Beamforming (CB) and Zero-Forcing (ZF) precoding. Numerical results are provided to verify the validity and accuracy of the solution.
[ { "created": "Wed, 19 Feb 2014 01:35:40 GMT", "version": "v1" } ]
2014-02-20
[ [ "Zhu", "Dengkui", "" ], [ "Li", "Boyu", "" ], [ "Liang", "Ping", "" ] ]
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1402.4544
Ming Shao
Zhou Weizheng, Shao Ming, Li Cheng, Chen Hongfang, Sun Yongjie, Chen Tianxiang
Monte Carlo Simulation of RPC-based PET with GEANT4
9 pages, 11 figures, submitted to Chinese Physics C
null
null
null
physics.ins-det hep-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Resistive Plate Chambers (RPC) are low-cost charged-particle detectors with good timing resolution and potentially good spatial resolution. Using RPC as gamma detector provides an opportunity for application in positron emission tomography (PET). In this work, we use GEANT4 simulation package to study various methods improving the detection efficiency of a realistic RPC-based PET model for 511keV photons, by adding more detection units, changing the thickness of each layer, choosing different converters and using multi-gaps RPC (MRPC) technique. Proper balance among these factors are discussed. It's found that although RPC with materials of high atomic number can reach a higher efficiency, they may contribute to a poor spatial resolution and higher background level.
[ { "created": "Wed, 19 Feb 2014 01:40:27 GMT", "version": "v1" } ]
2014-02-20
[ [ "Weizheng", "Zhou", "" ], [ "Ming", "Shao", "" ], [ "Cheng", "Li", "" ], [ "Hongfang", "Chen", "" ], [ "Yongjie", "Sun", "" ], [ "Tianxiang", "Chen", "" ] ]
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1402.4556
Yitong Yin
Yitong Yin
Spatial Mixing of Coloring Random Graphs
null
null
null
null
cs.DS math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the strong spatial mixing (decay of correlation) property of proper $q$-colorings of random graph $G(n, d/n)$ with a fixed $d$. The strong spatial mixing of coloring and related models have been extensively studied on graphs with bounded maximum degree. However, for typical classes of graphs with bounded average degree, such as $G(n, d/n)$, an easy counterexample shows that colorings do not exhibit strong spatial mixing with high probability. Nevertheless, we show that for $q\ge\alpha d+\beta$ with $\alpha>2$ and sufficiently large $\beta=O(1)$, with high probability proper $q$-colorings of random graph $G(n, d/n)$ exhibit strong spatial mixing with respect to an arbitrarily fixed vertex. This is the first strong spatial mixing result for colorings of graphs with unbounded maximum degree. Our analysis of strong spatial mixing establishes a block-wise correlation decay instead of the standard point-wise decay, which may be of interest by itself, especially for graphs with unbounded degree.
[ { "created": "Wed, 19 Feb 2014 04:19:28 GMT", "version": "v1" } ]
2014-02-20
[ [ "Yin", "Yitong", "" ] ]
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1402.4562
Vladimir Tuz
Vladimir R. Tuz, Denis V. Novitsky, Pavel L. Mladyonov, Sergey L. Prosvirnin, Andrey V. Novitsky
Nonlinear interaction of two trapped-mode resonances in a bilayer fish-scale metamaterial
18 pages, 8 figures
Journal of the Optical Society of America B 31, 2014, 2095-2103
10.1364/JOSAB.31.002095
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We report on a bistable light transmission through a bilayer "fish-scale" (meander-line) metamaterial. It is demonstrated that an all-optical switching may be achieved nearly the frequency of the high-quality-factor Fano-shaped trapped-mode resonance excitation. The nonlinear interaction of two closely spaced trapped-mode resonances in the bilayer structure composed with a Kerr-type nonlinear dielectric slab is analyzed in both frequency and time domains. It is demonstrated that these two resonances react differently on the applied intense light which leads to destination of a multistable transmission.
[ { "created": "Wed, 19 Feb 2014 06:09:56 GMT", "version": "v1" }, { "created": "Wed, 20 Aug 2014 18:33:32 GMT", "version": "v2" } ]
2014-11-11
[ [ "Tuz", "Vladimir R.", "" ], [ "Novitsky", "Denis V.", "" ], [ "Mladyonov", "Pavel L.", "" ], [ "Prosvirnin", "Sergey L.", "" ], [ "Novitsky", "Andrey V.", "" ] ]
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1402.4566
Jaydeep De
Jaydeep De and Xiaowei Zhang and Li Cheng
Transduction on Directed Graphs via Absorbing Random Walks
The paper is withdrawn because of some violation in institute policy
null
null
null
cs.CV cs.LG stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we consider the problem of graph-based transductive classification, and we are particularly interested in the directed graph scenario which is a natural form for many real world applications. Different from existing research efforts that either only deal with undirected graphs or circumvent directionality by means of symmetrization, we propose a novel random walk approach on directed graphs using absorbing Markov chains, which can be regarded as maximizing the accumulated expected number of visits from the unlabeled transient states. Our algorithm is simple, easy to implement, and works with large-scale graphs. In particular, it is capable of preserving the graph structure even when the input graph is sparse and changes over time, as well as retaining weak signals presented in the directed edges. We present its intimate connections to a number of existing methods, including graph kernels, graph Laplacian based methods, and interestingly, spanning forest of graphs. Its computational complexity and the generalization error are also studied. Empirically our algorithm is systematically evaluated on a wide range of applications, where it has shown to perform competitively comparing to a suite of state-of-the-art methods.
[ { "created": "Wed, 19 Feb 2014 06:41:12 GMT", "version": "v1" }, { "created": "Tue, 18 Mar 2014 02:05:34 GMT", "version": "v2" } ]
2014-03-19
[ [ "De", "Jaydeep", "" ], [ "Zhang", "Xiaowei", "" ], [ "Cheng", "Li", "" ] ]
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1402.4570
Girish Varma
Manoj Gopalkrishnan, Girish Varma
Playing games in an uncertain world
null
null
null
null
cs.GT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Traditional game theory assumes that the players in the game are aware of the rules of the game. However, in practice, often the players are unaware or have only partial knowledge about the game they are playing. They may also have knowledge that other players have only partial knowledge of the game they are playing, which they can try to exploit. We present a novel mathematical formulation of such games. We make use of Kripke semantics, which are a way to keep track of what different players know and do not know about the world. We propose a notion of equilibrium for such games, and show that equilibrium always exists.
[ { "created": "Wed, 19 Feb 2014 07:30:13 GMT", "version": "v1" } ]
2014-02-20
[ [ "Gopalkrishnan", "Manoj", "" ], [ "Varma", "Girish", "" ] ]
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1402.4572
Mingyue Ji
Mingyue Ji, Antonia M. Tulino, Jaime Llorca, Giuseppe Caire
Caching and Coded Multicasting: Multiple Groupcast Index Coding
5 pages, 1 figure, to appear in GlobalSIP14, Dec. 2014
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The capacity of caching networks has received considerable attention in the past few years. A particularly studied setting is the case of a single server (e.g., a base station) and multiple users, each of which caches segments of files in a finite library. Each user requests one (whole) file in the library and the server sends a common coded multicast message to satisfy all users at once. The problem consists of finding the smallest possible codeword length to satisfy such requests. In this paper we consider the generalization to the case where each user places $L \geq 1$ requests. The obvious naive scheme consists of applying $L$ times the order-optimal scheme for a single request, obtaining a linear in $L$ scaling of the multicast codeword length. We propose a new achievable scheme based on multiple groupcast index coding that achieves a significant gain over the naive scheme. Furthermore, through an information theoretic converse we find that the proposed scheme is approximately optimal within a constant factor of (at most) $18$.
[ { "created": "Wed, 19 Feb 2014 07:31:41 GMT", "version": "v1" }, { "created": "Wed, 29 Oct 2014 04:25:18 GMT", "version": "v2" } ]
2014-10-30
[ [ "Ji", "Mingyue", "" ], [ "Tulino", "Antonia M.", "" ], [ "Llorca", "Jaime", "" ], [ "Caire", "Giuseppe", "" ] ]
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1402.4573
Krzysztof Pachucki
Mariusz Puchalski and Krzysztof Pachucki
Ground state hyperfine splitting in the Be$^+$ ion
7 pages
Phys. Rev. A 89, 032510 (2014)
10.1103/PhysRevA.89.032510
null
physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Relativistic and QED corrections are calculated for the hyperfine splitting (hfs) in the $2S_{1/2}$ ground state of $^{9}$Be$^+$ ions with an exact account for electronic correlations. The achieved accuracy is sufficient to determine the finite nuclear size effects from the comparison to the experimental hfs value. The obtained results establish the ground to determine the neutron halo in $^{11}$Be.
[ { "created": "Wed, 19 Feb 2014 07:34:36 GMT", "version": "v1" }, { "created": "Thu, 13 Mar 2014 19:22:06 GMT", "version": "v2" } ]
2015-06-18
[ [ "Puchalski", "Mariusz", "" ], [ "Pachucki", "Krzysztof", "" ] ]
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1402.4576
Mingyue Ji
Mingyue Ji, Antonia M. Tulino, Jaime Llorca, Giuseppe Caire
On the Average Performance of Caching and Coded Multicasting with Random Demands
5 pages, 3 figure, to appear in ISWCS 2014
null
null
null
cs.IT cs.NI math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
For a network with one sender, $n$ receivers (users) and $m$ possible messages (files), caching side information at the users allows to satisfy arbitrary simultaneous demands by sending a common (multicast) coded message. In the worst-case demand setting, explicit deterministic and random caching strategies and explicit linear coding schemes have been shown to be order optimal. In this work, we consider the same scenario where the user demands are random i.i.d., according to a Zipf popularity distribution. In this case, we pose the problem in terms of the minimum average number of equivalent message transmissions. We present a novel decentralized random caching placement and a coded delivery scheme which are shown to achieve order-optimal performance. As a matter of fact, this is the first order-optimal result for the caching and coded multicasting problem in the case of random demands.
[ { "created": "Wed, 19 Feb 2014 07:40:33 GMT", "version": "v1" }, { "created": "Wed, 2 Jul 2014 21:20:43 GMT", "version": "v2" } ]
2014-07-04
[ [ "Ji", "Mingyue", "" ], [ "Tulino", "Antonia M.", "" ], [ "Llorca", "Jaime", "" ], [ "Caire", "Giuseppe", "" ] ]
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1402.4578
Lutz Bornmann Dr.
Lutz Bornmann, Ruediger Mutz
Growth rates of modern science: A bibliometric analysis based on the number of publications and cited references
Accepted for publication in the Journal of the Association for Information Science and Technology
null
null
null
cs.DL physics.soc-ph stat.AP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Many studies in information science have looked at the growth of science. In this study, we re-examine the question of the growth of science. To do this we (i) use current data up to publication year 2012 and (ii) analyse it across all disciplines and also separately for the natural sciences and for the medical and health sciences. Furthermore, the data are analysed with an advanced statistical technique - segmented regression analysis - which can identify specific segments with similar growth rates in the history of science. The study is based on two different sets of bibliometric data: (1) The number of publications held as source items in the Web of Science (WoS, Thomson Reuters) per publication year and (2) the number of cited references in the publications of the source items per cited reference year. We have looked at the rate at which science has grown since the mid-1600s. In our analysis of cited references we identified three growth phases in the development of science, which each led to growth rates tripling in comparison with the previous phase: from less than 1% up to the middle of the 18th century, to 2 to 3% up to the period between the two world wars and 8 to 9% to 2012.
[ { "created": "Wed, 19 Feb 2014 08:00:26 GMT", "version": "v1" }, { "created": "Wed, 30 Apr 2014 13:43:25 GMT", "version": "v2" }, { "created": "Thu, 8 May 2014 07:38:15 GMT", "version": "v3" } ]
2014-05-09
[ [ "Bornmann", "Lutz", "" ], [ "Mutz", "Ruediger", "" ] ]
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Growth rates of modern science: A bibliometric analysis based on the number of publications and cited references
https://arxiv.org/abs/1402.4578v3
https://arxiv.org/pdf/1402.4578v3.pdf
https://github.com/epcarraway/project5
false
false
https://paperswithcode.com/paper/growth-rates-of-modern-science-a-bibliometric
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1402.4587
Dario Gerace
Dario Gerace and Vincenzo Savona
Unconventional photon blockade in doubly resonant microcavities with second-order nonlinearity
null
Physical Review A 89, 031803(R) (2014)
10.1103/PhysRevA.89.031803
null
cond-mat.mes-hall physics.optics quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
It is shown that non-centrosymmetric materials with bulk second-order nonlinear susceptibility can be used to generate strongly antibunched radiation at an arbitrary wavelength, solely determined by the resonant behavior of suitably engineered coupled microcavities. The proposed scheme exploits the unconventional photon blockade of a coherent driving field at the input of a coupled cavity system, where one of the two cavities is engineered to resonate at both fundamental and second harmonic frequencies, respectively. Remarkably, the unconventional blockade mechanism occurs with reasonably low quality factors at both harmonics, and does not require a sharp doubly-resonant condition for the second cavity, thus proving its feasibility with current semiconductor technology.
[ { "created": "Wed, 19 Feb 2014 08:38:12 GMT", "version": "v1" } ]
2014-03-21
[ [ "Gerace", "Dario", "" ], [ "Savona", "Vincenzo", "" ] ]
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1402.4590
Jiang Yupeng
Yupeng Jiang and DongDai Lin
On the distinctness of binary sequences derived from $2$-adic expansion of m-sequences over finite prime fields
7 pages
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let $p$ be an odd prime with $2$-adic expansion $\sum_{i=0}^kp_i\cdot2^i$. For a sequence $\underline{a}=(a(t))_{t\ge 0}$ over $\mathbb{F}_{p}$, each $a(t)$ belongs to $\{0,1,\ldots, p-1\}$ and has a unique $2$-adic expansion $$a(t)=a_0(t)+a_1(t)\cdot 2+\cdots+a_{k}(t)\cdot2^k,$$ with $a_i(t)\in\{0, 1\}$. Let $\underline{a_i}$ denote the binary sequence $(a_i(t))_{t\ge 0}$ for $0\le i\le k$. Assume $i_0$ is the smallest index $i$ such that $p_{i}=0$ and $\underline{a}$ and $\underline{b}$ are two different m-sequences generated by a same primitive characteristic polynomial over $\mathbb{F}_p$. We prove that for $i\neq i_0$ and $0\le i\le k$, $\underline{a_i}=\underline{b_i}$ if and only if $\underline{a}=\underline{b}$, and for $i=i_0$, $\underline{a_{i_0}}=\underline{b_{i_0}}$ if and only if $\underline{a}=\underline{b}$ or $\underline{a}=-\underline{b}$. Then the period of $\underline{a_i}$ is equal to the period of $\underline{a}$ if $i\ne i_0$ and half of the period of $\underline{a}$ if $i=i_0$. We also discuss a possible application of the binary sequences $\underline{a_i}$.
[ { "created": "Wed, 19 Feb 2014 08:42:52 GMT", "version": "v1" } ]
2014-02-20
[ [ "Jiang", "Yupeng", "" ], [ "Lin", "DongDai", "" ] ]
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1402.4591
Qian Yue
Jian Su, Zhi Zeng, Hao MA, Qian Yue, Jian-Ping Cheng, Jian-Ping Chang, Nan Chen, Ning Chen, Qing-Hao Chen, Yun-Hua Chen, Yo-Chun Chuang, Zhi Deng, Qiang Du, Hui Gong, Xi-Qing Hao, Qing-Ju He, Han-Xiong Huang, Teng-Rui Huang, Hao Jiang, Ke-Jun Kang, Hau-Bin Li, Jian-Min Li, Jin Li, Jun Li, Xia Li, Xin-Ying Li, Xue-Qian Li, Yu-Lan Li, Yuan-Jing Li, Heng-Yi Liao, Fong-Kay Lin, Shin-Ted Lin, Shu-Kui Liu, Lan-Chun L\"u, Shao-Ji Mao, Jian-Qiang Qin, Jie Ren, Jing Ren, Xi-Chao Ruan, Man-Bin Shen, Lakhwinder Singh, Manoj Kumar Singh, Arun Kumar Soma, Chang-Jian Tang, Chao-Hsiung Tseng, Ji-Min Wang, Li Wang, Qing Wang, Henry Tsz-King Wong, Shi-Yong Wu, Yu-Cheng Wu, Hao-Yang Xing, Yin Xu, Tao Xue, Li-Tao Yang, Song-Wei Yang, Nan Yi, Chun-Xu Yu, Hao Yu, Xun-Zhen Yu, Xiong-Hui Zeng, Lan Zhang, Yun-Hua Zhang, Ming-Gang Zhao, Wei Zhao, Zu-Ying Zhou, Jing-Jun Zhu, Wei-Bin Zhu, Xue-Zhou Zhu, Zhong-Hua Zhu
Study of the material photon and electron background and the liquid argon detector veto efficiency of the CDEX-10 experiment
10 pages, 5 figures, 4 tables, submitted to Chinese Physics C
null
10.1088/1674-1137/39/3/036001
null
physics.ins-det nucl-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The China Dark Matter Experiment (CDEX) is located at the China Jinping underground laboratory (CJPL) and aims to directly detect the WIMP flux with high sensitivity in the low mass region. Here we present a study of the predicted photon and electron backgrounds including the background contribution of the structure materials of the germanium detector, the passive shielding materials, and the intrinsic radioactivity of the liquid argon that serves as an anti-Compton active shielding detector. A detailed geometry is modeled and the background contribution has been simulated based on the measured radioactivities of all possible components within the GEANT4 program. Then the photon and electron background level in the energy region of interest (<10^-2 events kg-1 day-1 keV-1 (cpkkd)) is predicted based on Monte Carlo simulations. The simulated result is consistent with the design goal of CDEX-10 experiment, 0.1 cpkkd, which shows that the active and passive shield design of CDEX-10 is effective and feasible.
[ { "created": "Wed, 19 Feb 2014 08:45:03 GMT", "version": "v1" } ]
2015-06-18
[ [ "Su", "Jian", "" ], [ "Zeng", "Zhi", "" ], [ "MA", "Hao", "" ], [ "Yue", "Qian", "" ], [ "Cheng", "Jian-Ping", "" ], [ "Chang", "Jian-Ping", "" ], [ "Chen", "Nan", "" ], [ "Chen", "Ning", "" ], [ "Chen", "Qing-Hao", "" ], [ "Chen", "Yun-Hua", "" ], [ "Chuang", "Yo-Chun", "" ], [ "Deng", "Zhi", "" ], [ "Du", "Qiang", "" ], [ "Gong", "Hui", "" ], [ "Hao", "Xi-Qing", "" ], [ "He", "Qing-Ju", "" ], [ "Huang", "Han-Xiong", "" ], [ "Huang", "Teng-Rui", "" ], [ "Jiang", "Hao", "" ], [ "Kang", "Ke-Jun", "" ], [ "Li", "Hau-Bin", "" ], [ "Li", "Jian-Min", "" ], [ "Li", "Jin", "" ], [ "Li", "Jun", "" ], [ "Li", "Xia", "" ], [ "Li", "Xin-Ying", "" ], [ "Li", "Xue-Qian", "" ], [ "Li", "Yu-Lan", "" ], [ "Li", "Yuan-Jing", "" ], [ "Liao", "Heng-Yi", "" ], [ "Lin", "Fong-Kay", "" ], [ "Lin", "Shin-Ted", "" ], [ "Liu", "Shu-Kui", "" ], [ "Lü", "Lan-Chun", "" ], [ "Mao", "Shao-Ji", "" ], [ "Qin", "Jian-Qiang", "" ], [ "Ren", "Jie", "" ], [ "Ren", "Jing", "" ], [ "Ruan", "Xi-Chao", "" ], [ "Shen", "Man-Bin", "" ], [ "Singh", "Lakhwinder", "" ], [ "Singh", "Manoj Kumar", "" ], [ "Soma", "Arun Kumar", "" ], [ "Tang", "Chang-Jian", "" ], [ "Tseng", "Chao-Hsiung", "" ], [ "Wang", "Ji-Min", "" ], [ "Wang", "Li", "" ], [ "Wang", "Qing", "" ], [ "Wong", "Henry Tsz-King", "" ], [ "Wu", "Shi-Yong", "" ], [ "Wu", "Yu-Cheng", "" ], [ "Xing", "Hao-Yang", "" ], [ "Xu", "Yin", "" ], [ "Xue", "Tao", "" ], [ "Yang", "Li-Tao", "" ], [ "Yang", "Song-Wei", "" ], [ "Yi", "Nan", "" ], [ "Yu", "Chun-Xu", "" ], [ "Yu", "Hao", "" ], [ "Yu", "Xun-Zhen", "" ], [ "Zeng", "Xiong-Hui", "" ], [ "Zhang", "Lan", "" ], [ "Zhang", "Yun-Hua", "" ], [ "Zhao", "Ming-Gang", "" ], [ "Zhao", "Wei", "" ], [ "Zhou", "Zu-Ying", "" ], [ "Zhu", "Jing-Jun", "" ], [ "Zhu", "Wei-Bin", "" ], [ "Zhu", "Xue-Zhou", "" ], [ "Zhu", "Zhong-Hua", "" ] ]
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