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1401.0660
Bruno Mery
Bruno Mery (LaBRI), Richard Moot (LaBRI), Christian Retor\'e (LaBRI)
Plurals: individuals and sets in a richly typed semantics
null
LENSL'10 - 10th Workshop on Logic and Engineering of Natural Semantics of Language, Japanese Symposium for Artifitial Intelligence, International Society for AI - 2013 (2013)
null
null
cs.CL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We developed a type-theoretical framework for natural lan- guage semantics that, in addition to the usual Montagovian treatment of compositional semantics, includes a treatment of some phenomena of lex- ical semantic: coercions, meaning, transfers, (in)felicitous co-predication. In this setting we see how the various readings of plurals (collective, dis- tributive, coverings,...) can be modelled.
[ { "created": "Fri, 3 Jan 2014 15:37:19 GMT", "version": "v1" } ]
2014-01-06
[ [ "Mery", "Bruno", "", "LaBRI" ], [ "Moot", "Richard", "", "LaBRI" ], [ "Retoré", "Christian", "", "LaBRI" ] ]
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1401.0668
Juho Luomahaara
Juho Luomahaara, Visa Vesterinen, Leif Gr\"onberg, Juha Hassel
Kinetic Inductance Magnetometer
16 pages, 6 figures
null
10.1038/ncomms5872
null
physics.ins-det cond-mat.supr-con
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Ultrasensitive magnetic field detection is utilized in the fields of science, medicine and industry. We report on a novel magnetometer relying on the kinetic inductance of superconducting material. The kinetic inductance exhibits a non-linear response with respect to DC current, a fact that is exploited by applying magnetic flux through a superconducting loop to generate a shielding current and a change in the inductance of the loop. The magnetometer is arranged into a resonator, allowing readout through a transmission measurement that makes the device compatible with radio frequency multiplexing techniques. The device is fabricated using a single thin-film layer of NbN, simplifying the fabrication process compared to existing magnetometer technologies considerably. Our experimental data, supported by theory, demonstrates a magnetometer having potential to replace established technology in applications requiring ultra-high sensitivity.
[ { "created": "Fri, 3 Jan 2014 16:37:16 GMT", "version": "v1" } ]
2014-09-12
[ [ "Luomahaara", "Juho", "" ], [ "Vesterinen", "Visa", "" ], [ "Grönberg", "Leif", "" ], [ "Hassel", "Juha", "" ] ]
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1401.0670
Zhe Wang
Zhe Wang, Qinwei Zhang, Jing Yuan, Xiaogang Wang
MRF denoising with compressed sensing and adaptive filtering
4 pages,5 figures
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The recently proposed Magnetic Resonance Fingerprinting (MRF) technique can simultaneously estimate multiple parameters through dictionary matching. It has promising potentials in a wide range of applications. However, MRF introduces errors due to undersampling during the data acquisition process and the limit of dictionary resolution. In this paper, we investigate the error source of MRF and propose the technologies of improving the quality of MRF with compressed sensing, error prediction by decision trees, and adaptive filtering. Experimental results support our observations and show significant improvement of the proposed technologies.
[ { "created": "Fri, 3 Jan 2014 16:40:18 GMT", "version": "v1" } ]
2014-01-06
[ [ "Wang", "Zhe", "" ], [ "Zhang", "Qinwei", "" ], [ "Yuan", "Jing", "" ], [ "Wang", "Xiaogang", "" ] ]
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1401.0672
Brian Sawyer
Brian C. Sawyer, Joseph W. Britton, and John J. Bollinger
Spin Dephasing as a Probe of Mode Temperature, Motional State Distributions, and Heating Rates in a 2D Ion Crystal
12 pages, 6 figures
Phys. Rev. A 89, 033408 (2014)
10.1103/PhysRevA.89.033408
null
quant-ph physics.atom-ph physics.plasm-ph
http://creativecommons.org/licenses/publicdomain/
We employ spin-dependent optical dipole forces to characterize the transverse center-of-mass (COM) motional mode of a two-dimensional Wigner crystal of hundreds of $^9$Be$^+$. By comparing the measured spin dephasing produced by the spin-dependent force with the predictions of a semiclassical dephasing model, we obtain absolute mode temperatures in excellent agreement with both the Doppler laser cooling limit and measurements obtained from a previously published technique (B. C. Sawyer et al. Phys. Rev. Lett. \textbf{108}, 213003 (2012)). Furthermore, the structure of the dephasing histograms allows for discrimination between initial thermal and coherent states of motion. We also apply the techniques discussed here to measure, for the first time, the ambient heating rate of the COM mode of a 2D Coulomb crystal in a Penning trap. This measurement places an upper limit on the anomalous single-ion heating rate due to electric field noise from the trap electrode surfaces of $\frac{d\bar{n}}{dt}\sim 5$ s$^{-1}$ for our trap at a frequency of 795 kHz, where $\bar{n}$ is the mean occupation of quantized COM motion in the axial harmonic well.
[ { "created": "Fri, 3 Jan 2014 16:51:16 GMT", "version": "v1" } ]
2014-03-19
[ [ "Sawyer", "Brian C.", "" ], [ "Britton", "Joseph W.", "" ], [ "Bollinger", "John J.", "" ] ]
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1401.0676
Shulabh Gupta
Shulabh Gupta, Qingfeng Zhang, Lianfeng Zou, Li Jun Jiang, and Christophe Caloz
Generalized Coupled-line All-Pass Phasers
10 pages, 11 figures
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null
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Generalized coupled-line all-pass phasers, based on transversally-cascaded (TC), longitudinally-cascaded (LC) and hybrid-cascaded (HC) coupled transmission line sections, are presented and demonstrated using analytical, full-wave and experimental results. It is shown that for N commensurate coupled-line sections, LC and TC phasers exhibit N group delay peaks per coupled-line section harmonic frequency band, in contrast to the TC configuration, which exhibits only one peak within this band. It is also shown that for a given maximum achievable coupling-coefficient, the HC configuration provides the largest group delay swing. A wave-interference analysis is finally applied to the various coupled-line phasers, explaining their unique group delay characteristics based on physical wave-propagation mechanisms.
[ { "created": "Fri, 3 Jan 2014 17:01:44 GMT", "version": "v1" } ]
2014-01-06
[ [ "Gupta", "Shulabh", "" ], [ "Zhang", "Qingfeng", "" ], [ "Zou", "Lianfeng", "" ], [ "Jiang", "Li Jun", "" ], [ "Caloz", "Christophe", "" ] ]
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1401.0678
Luca Moriconi
L. Moriconi, R.M. Pereira and L.S. Grigorio
Velocity-Gradient Probability Distribution Functions in a Lagrangian Model of Turbulence
17 pages, 11 figures
null
10.1088/1742-5468/2014/10/P10015
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Recent Fluid Deformation Closure (RFDC) model of lagrangian turbulence is recast in path-integral language within the framework of the Martin-Siggia-Rose functional formalism. In order to derive analytical expressions for the velocity-gradient probability distribution functions (vgPDFs), we carry out noise renormalization in the low-frequency regime and find approximate extrema for the Martin-Siggia-Rose effective action. We verify, with the help of Monte Carlo simulations, that the vgPDFs so obtained yield a close description of the single-point statistical features implied by the original RFDC stochastic differential equations.
[ { "created": "Fri, 3 Jan 2014 17:06:13 GMT", "version": "v1" } ]
2015-06-18
[ [ "Moriconi", "L.", "" ], [ "Pereira", "R. M.", "" ], [ "Grigorio", "L. S.", "" ] ]
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1401.0684
Michael Bekos
Michael A. Bekos, Martin Gronemann, Chrysanthi N. Raftopoulou
Two-Page Book Embeddings of 4-Planar Graphs
21 pages, 16 Figures. A shorter version is to appear at STACS 2014
null
null
null
cs.DM cs.CC math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Back in the Eighties, Heath showed that every 3-planar graph is subhamiltonian and asked whether this result can be extended to a class of graphs of degree greater than three. In this paper we affirmatively answer this question for the class of 4-planar graphs. Our contribution consists of two algorithms: The first one is limited to triconnected graphs, but runs in linear time and uses existing methods for computing hamiltonian cycles in planar graphs. The second one, which solves the general case of the problem, is a quadratic-time algorithm based on the book-embedding viewpoint of the problem.
[ { "created": "Fri, 3 Jan 2014 17:28:56 GMT", "version": "v1" } ]
2014-01-06
[ [ "Bekos", "Michael A.", "" ], [ "Gronemann", "Martin", "" ], [ "Raftopoulou", "Chrysanthi N.", "" ] ]
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1401.0685
Dongpo Fu
Dongpo Fu, Weijiang Zhao, Peng Guo, Kun Zhu, Jinghui Wang, Jingshan Hua, Xiaotang Ren, Jianming Xue, Hongwei Zhao, Kexin Liu
The discharge characteristics of the DUHOCAMIS with a high magnetic bottle-shaped field
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null
10.1088/1674-1137/38/10/107006
null
physics.acc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
For the purpose to produce high intensity, multiply charged metal ion beams, the DUHOCAMIS (dual hollow cathode ion source for metal ions) was derived from the hot cathode Penning ion source combined with the hollow cathode sputtering experiments in 2007. It was interesting to investigate the behavior of this discharge geometry in a stronger magnetic bottle-shaped field. So a new test bench for DUHOCAMIS with a high magnetic bottle-shaped field up to 0.6 T has been set up at Peking University, on which have been made primary experiments in connection with discharge characteristics of the source. The experiments with magnetic fields from 0.13 T to 0.52 T have shown that the magnetic flux densities are very sensitive to the discharge behavior: discharge curves and ion spectra. It has been found that the slope of discharge curves in a very wide range can be controlled by changing the magnetic field as well as regulated by adjusting cathode heating power. On the other hand, by comparison of discharge curves between dual hollow cathode discharge (DHCD) mode and PIG discharge mode, it was found a much stronger magnetic effect occurred on DHCD mode. In this paper, the new test bench with ion source structure is described in detail; and main experimental results are presented and discussed, including the effects of cathode heating power and magnetic flux density on discharge characteristics, also the ion spectra. The effects of the magnetic field on the source operating are emphasized, and a unique behavior of the DUHOCAMIS operating in the high magnetic field is expected and discussed especially.
[ { "created": "Wed, 1 Jan 2014 05:31:27 GMT", "version": "v1" } ]
2015-06-18
[ [ "Fu", "Dongpo", "" ], [ "Zhao", "Weijiang", "" ], [ "Guo", "Peng", "" ], [ "Zhu", "Kun", "" ], [ "Wang", "Jinghui", "" ], [ "Hua", "Jingshan", "" ], [ "Ren", "Xiaotang", "" ], [ "Xue", "Jianming", "" ], [ "Zhao", "Hongwei", "" ], [ "Liu", "Kexin", "" ] ]
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1401.0689
Ankush Roy
Ankush Roy, Biswajit Halder, Utpal Garain, David S. Doermann
Machine Assisted Authentication of Paper Currency: an Experiment on Indian Banknotes
There were several errors in the experimental section which we are looking into
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null
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cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Automatic authentication of paper money has been targeted. Indian bank notes are taken as reference to show how a system can be developed for discriminating fake notes from genuine ones. Image processing and pattern recognition techniques are used to design the overall approach. The ability of the embedded security aspects is thoroughly analysed for detecting fake currencies. Real forensic samples are involved in the experiment that shows a high precision machine can be developed for authentication of paper money. The system performance is reported in terms of both accuracy and processing speed. Comparison with human subjects namely forensic experts and bank staffs clearly shows its applicability for mass checking of currency notes in the real world. The analysis of security features to protect counterfeiting highlights some facts that should be taken care of in future designing of currency notes.
[ { "created": "Thu, 2 Jan 2014 18:12:05 GMT", "version": "v1" }, { "created": "Fri, 7 Nov 2014 23:14:03 GMT", "version": "v2" }, { "created": "Thu, 22 Jan 2015 02:08:03 GMT", "version": "v3" }, { "created": "Wed, 6 May 2015 07:49:16 GMT", "version": "v4" }, { "created": "Fri, 5 Jun 2015 23:14:19 GMT", "version": "v5" } ]
2015-06-09
[ [ "Roy", "Ankush", "" ], [ "Halder", "Biswajit", "" ], [ "Garain", "Utpal", "" ], [ "Doermann", "David S.", "" ] ]
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1401.0694
Bartlomiej Placzek
Bartlomiej Placzek and Marcin Bernas
Uncertainty-based information extraction in wireless sensor networks for control applications
19 pages, 10 figures. Ad Hoc Networks 2013
Ad Hoc Networks 14C (2014) pp. 106-117
10.1016/j.adhoc.2013.11.009
null
cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Design of control applications over wireless sensor networks (WSNs) is a challenging issue due to the bandwidth-limited communication medium, energy constraints and real-time data delivery requirements. This paper introduces a new information extraction method for WSN-based control applications, which reduces the number of required data transmissions to save energy and avoid data congestion. According to the proposed approach, control applications recognize when new data readings have to be collected and determine sensor nodes that have to be activated on the basis of uncertainty analysis. Processing of the selectively collected input data is based on definition of information granules that describe state of the controlled system as well as performance of particular control decisions. This method was implemented for object tracking in WSNs. The task is to control movement of a mobile sink, which has to reach a target in the shortest possible time. Extensive simulation experiments were performed to compare performance of the proposed approach against state-of-the-art methods. Results of the experiments show that the presented information extraction method allows for substantial reduction in the amount of transmitted data with no significant negative effect on tracking performance.
[ { "created": "Fri, 3 Jan 2014 18:10:38 GMT", "version": "v1" } ]
2014-01-08
[ [ "Placzek", "Bartlomiej", "" ], [ "Bernas", "Marcin", "" ] ]
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1401.0698
Jerry Vavra
J.Va'vra
A New Possible Way to Explain the DAMA Results
5 pages, 8 figures
null
10.1016/j.physletb.2014.06.038
SLAC-PUB-15863
astro-ph.GA astro-ph.IM physics.ins-det
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
At present there is an effort to reconcile the results of the DAMA experiment with those from other Dark Matter experiments such as CoGeNT, CRESST, CDMS, and all LXe experiments. The author suggests a new model describing the Dark Matter signal as the result of collisions of very light (1-to-few GeV/c^2) WIMPs with hydrogen, and compares it with currently accepted models of collisions with heavy nuclei (Na, Ge or Xe). The hydrogen target would come from H-contamination of NaI(Tl), Ge and CaWO4 crystals. Initial tuning indicates that one can explain the modulation amplitude of DAMA and CoGeNT with this model, assuming a WIMP-proton cross section between 10^33 and 10^32 cm^2. This paper should be considered to be a new idea which will need substantial new experimental input from all involved experiments.
[ { "created": "Fri, 3 Jan 2014 19:04:46 GMT", "version": "v1" }, { "created": "Fri, 10 Jan 2014 23:03:57 GMT", "version": "v2" }, { "created": "Thu, 20 Feb 2014 23:23:12 GMT", "version": "v3" }, { "created": "Wed, 7 May 2014 03:22:20 GMT", "version": "v4" }, { "created": "Tue, 17 Jun 2014 00:44:32 GMT", "version": "v5" } ]
2016-11-26
[ [ "Va'vra", "J.", "" ] ]
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1401.0699
Yury Makarychev
Konstantin Makarychev and Yury Makarychev
Nonuniform Graph Partitioning with Unrelated Weights
null
null
null
null
cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We give a bi-criteria approximation algorithm for the Minimum Nonuniform Partitioning problem, recently introduced by Krauthgamer, Naor, Schwartz and Talwar (2014). In this problem, we are given a graph $G=(V,E)$ on $n$ vertices and $k$ numbers $\rho_1,\dots, \rho_k$. The goal is to partition the graph into $k$ disjoint sets $P_1,\dots, P_k$ satisfying $|P_i|\leq \rho_i n$ so as to minimize the number of edges cut by the partition. Our algorithm has an approximation ratio of $O(\sqrt{\log n \log k})$ for general graphs, and an $O(1)$ approximation for graphs with excluded minors. This is an improvement upon the $O(\log n)$ algorithm of Krauthgamer, Naor, Schwartz and Talwar (2014). Our approximation ratio matches the best known ratio for the Minimum (Uniform) $k$-Partitioning problem. We extend our results to the case of "unrelated weights" and to the case of "unrelated $d$-dimensional weights". In the former case, different vertices may have different weights and the weight of a vertex may depend on the set $P_i$ the vertex is assigned to. In the latter case, each vertex $u$ has a $d$-dimensional weight $r(u,i) = (r_1(u,i), \dots, r_d(u,i))$ if $u$ is assigned to $P_i$. Each set $P_i$ has a $d$-dimensional capacity $c(i) = (c_1(i),\dots, c_d(i))$. The goal is to find a partition such that $\sum_{u\in {P_i}} r(u,i) \leq c(i)$ coordinate-wise.
[ { "created": "Fri, 3 Jan 2014 19:10:51 GMT", "version": "v1" }, { "created": "Thu, 13 Feb 2014 20:44:00 GMT", "version": "v2" }, { "created": "Mon, 28 Apr 2014 16:57:03 GMT", "version": "v3" } ]
2014-04-29
[ [ "Makarychev", "Konstantin", "" ], [ "Makarychev", "Yury", "" ] ]
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1401.0702
Massimo Cafaro
Massimo Cafaro, Marco Pulimeno and Piergiulio Tempesta
A Parallel Space Saving Algorithm For Frequent Items and the Hurwitz zeta distribution
Accepted for publication. To appear in Information Sciences, Elsevier. http://www.sciencedirect.com/science/article/pii/S002002551500657X
Information Sciences, Elsevier, Volume 329, 2016, pp. 1 - 19, ISSN: 0020-0255
10.1016/j.ins.2015.09.003
null
cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a message-passing based parallel version of the Space Saving algorithm designed to solve the $k$--majority problem. The algorithm determines in parallel frequent items, i.e., those whose frequency is greater than a given threshold, and is therefore useful for iceberg queries and many other different contexts. We apply our algorithm to the detection of frequent items in both real and synthetic datasets whose probability distribution functions are a Hurwitz and a Zipf distribution respectively. Also, we compare its parallel performances and accuracy against a parallel algorithm recently proposed for merging summaries derived by the Space Saving or Frequent algorithms.
[ { "created": "Fri, 3 Jan 2014 19:34:14 GMT", "version": "v1" }, { "created": "Thu, 13 Aug 2015 07:59:35 GMT", "version": "v10" }, { "created": "Thu, 3 Sep 2015 08:16:34 GMT", "version": "v11" }, { "created": "Sat, 19 Sep 2015 13:34:20 GMT", "version": "v12" }, { "created": "Mon, 6 Jan 2014 09:31:45 GMT", "version": "v2" }, { "created": "Tue, 21 Jan 2014 17:03:52 GMT", "version": "v3" }, { "created": "Mon, 19 May 2014 15:01:57 GMT", "version": "v4" }, { "created": "Tue, 7 Oct 2014 21:17:35 GMT", "version": "v5" }, { "created": "Wed, 3 Dec 2014 16:21:00 GMT", "version": "v6" }, { "created": "Mon, 15 Jun 2015 13:21:55 GMT", "version": "v7" }, { "created": "Tue, 16 Jun 2015 10:24:26 GMT", "version": "v8" }, { "created": "Sun, 2 Aug 2015 09:18:00 GMT", "version": "v9" } ]
2015-09-29
[ [ "Cafaro", "Massimo", "" ], [ "Pulimeno", "Marco", "" ], [ "Tempesta", "Piergiulio", "" ] ]
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1401.0704
Timo Jolivet
Val\'erie Berth\'e, J\'er\'emie Bourdon, Timo Jolivet, Anne Siegel
A combinatorial approach to products of Pisot substitutions
32 pages, v2 with many corrections and improvements
Ergod. Th. Dynam. Sys. 36 (2016) 1757-1794
10.1017/etds.2014.141
null
math.DS cs.DM math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We define a generic algorithmic framework to prove pure discrete spectrum for the substitutive symbolic dynamical systems associated with some infinite families of Pisot substitutions. We focus on the families obtained as finite products of the three-letter substitutions associated with the multidimensional continued fraction algorithms of Brun and Jacobi-Perron. Our tools consist in a reformulation of some combinatorial criteria (coincidence conditions), in terms of properties of discrete plane generation using multidimensional (dual) substitutions. We also deduce some topological and dynamical properties of the Rauzy fractals, of the underlying symbolic dynamical systems, as well as some number-theoretical properties of the associated Pisot numbers.
[ { "created": "Fri, 3 Jan 2014 19:52:33 GMT", "version": "v1" }, { "created": "Thu, 26 Jun 2014 17:20:31 GMT", "version": "v2" } ]
2019-02-20
[ [ "Berthé", "Valérie", "" ], [ "Bourdon", "Jérémie", "" ], [ "Jolivet", "Timo", "" ], [ "Siegel", "Anne", "" ] ]
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1401.0705
Timo Jolivet
Timo Jolivet, Jarkko Kari
Undecidable properties of self-affine sets and multi-tape automata
10 pages, v2 includes some corrections to match the published version
MFCS 2014, conference proccedings LNCS 8634, 352-364
10.1007/978-3-662-44522-8_30
null
cs.FL math.CO math.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the decidability of the topological properties of some objects coming from fractal geometry. We prove that having empty interior is undecidable for the sets defined by two-dimensional graph-directed iterated function systems. These results are obtained by studying a particular class of self-affine sets associated with multi-tape automata. We first establish the undecidability of some language-theoretical properties of such automata, which then translate into undecidability results about their associated self-affine sets.
[ { "created": "Fri, 3 Jan 2014 19:53:17 GMT", "version": "v1" }, { "created": "Thu, 26 Jun 2014 17:42:37 GMT", "version": "v2" } ]
2014-09-26
[ [ "Jolivet", "Timo", "" ], [ "Kari", "Jarkko", "" ] ]
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1401.0708
Taraka Rama Kasicheyanula
Taraka Rama, Sudheer Kolachina, Lakshmi Bai B
Quantitative methods for Phylogenetic Inference in Historical Linguistics: An experimental case study of South Central Dravidian
null
Indian Linguistics, Volume 70, 2009
null
null
cs.CL cs.AI
http://creativecommons.org/licenses/by/3.0/
In this paper we examine the usefulness of two classes of algorithms Distance Methods, Discrete Character Methods (Felsenstein and Felsenstein 2003) widely used in genetics, for predicting the family relationships among a set of related languages and therefore, diachronic language change. Applying these algorithms to the data on the numbers of shared cognates- with-change and changed as well as unchanged cognates for a group of six languages belonging to a Dravidian language sub-family given in Krishnamurti et al. (1983), we observed that the resultant phylogenetic trees are largely in agreement with the linguistic family tree constructed using the comparative method of reconstruction with only a few minor differences. Furthermore, we studied these minor differences and found that they were cases of genuine ambiguity even for a well-trained historical linguist. We evaluated the trees obtained through our experiments using a well-defined criterion and report the results here. We finally conclude that quantitative methods like the ones we examined are quite useful in predicting family relationships among languages. In addition, we conclude that a modest degree of confidence attached to the intuition that there could indeed exist a parallelism between the processes of linguistic and genetic change is not totally misplaced.
[ { "created": "Fri, 3 Jan 2014 20:17:47 GMT", "version": "v1" } ]
2014-01-06
[ [ "Rama", "Taraka", "" ], [ "Kolachina", "Sudheer", "" ], [ "B", "Lakshmi Bai", "" ] ]
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1401.0711
Ishanu Chattopadhyay
Ishanu Chattopadhyay and Hod Lipson
Computing Entropy Rate Of Symbol Sources & A Distribution-free Limit Theorem
null
null
null
null
cs.IT cs.LG math.IT math.PR stat.CO stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Entropy rate of sequential data-streams naturally quantifies the complexity of the generative process. Thus entropy rate fluctuations could be used as a tool to recognize dynamical perturbations in signal sources, and could potentially be carried out without explicit background noise characterization. However, state of the art algorithms to estimate the entropy rate have markedly slow convergence; making such entropic approaches non-viable in practice. We present here a fundamentally new approach to estimate entropy rates, which is demonstrated to converge significantly faster in terms of input data lengths, and is shown to be effective in diverse applications ranging from the estimation of the entropy rate of English texts to the estimation of complexity of chaotic dynamical systems. Additionally, the convergence rate of entropy estimates do not follow from any standard limit theorem, and reported algorithms fail to provide any confidence bounds on the computed values. Exploiting a connection to the theory of probabilistic automata, we establish a convergence rate of $O(\log \vert s \vert/\sqrt[3]{\vert s \vert})$ as a function of the input length $\vert s \vert$, which then yields explicit uncertainty estimates, as well as required data lengths to satisfy pre-specified confidence bounds.
[ { "created": "Fri, 3 Jan 2014 20:30:01 GMT", "version": "v1" }, { "created": "Fri, 21 Mar 2014 07:29:34 GMT", "version": "v2" } ]
2014-03-24
[ [ "Chattopadhyay", "Ishanu", "" ], [ "Lipson", "Hod", "" ] ]
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1401.0718
Alexander Y. Kushnirenko
E.A.Kushnirenko
Generalization of the Poisson distribution for the case of changing probabilities of consecutive events
20 pages, 1 figure
null
null
null
physics.data-an hep-ex
http://creativecommons.org/licenses/by/3.0/
In this paper the generalization of the Poisson distribution is derived for the case when each consecutive event changes event rate. A simple formula for the probability of observing of a given number of events for the selected period of time is derived for a given set of rates. Application of this distribution in high-energy physics calculations is discussed.
[ { "created": "Fri, 3 Jan 2014 20:59:14 GMT", "version": "v1" } ]
2014-01-06
[ [ "Kushnirenko", "E. A.", "" ] ]
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1401.0730
Ahmet Iscen
Ahmet Iscen, Anil Armagan, Pinar Duygulu
What is usual in unusual videos? Trajectory snippet histograms for discovering unusualness
null
Computer Vision and Pattern Recognition Workshops (CVPRW), 2014 IEEE Conference on
10.1109/CVPRW.2014.123
null
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Unusual events are important as being possible indicators of undesired consequences. Moreover, unusualness in everyday life activities may also be amusing to watch as proven by the popularity of such videos shared in social media. Discovery of unusual events in videos is generally attacked as a problem of finding usual patterns, and then separating the ones that do not resemble to those. In this study, we address the problem from the other side, and try to answer what type of patterns are shared among unusual videos that make them resemble to each other regardless of the ongoing event. With this challenging problem at hand, we propose a novel descriptor to encode the rapid motions in videos utilizing densely extracted trajectories. The proposed descriptor, which is referred to as trajectory snipped histograms, is used to distinguish unusual videos from usual videos, and further exploited to discover snapshots in which unusualness happen. Experiments on domain specific people falling videos and unrestricted funny videos show the effectiveness of our method in capturing unusualness.
[ { "created": "Fri, 3 Jan 2014 21:00:33 GMT", "version": "v1" }, { "created": "Sun, 2 Nov 2014 21:52:51 GMT", "version": "v2" } ]
2014-11-04
[ [ "Iscen", "Ahmet", "" ], [ "Armagan", "Anil", "" ], [ "Duygulu", "Pinar", "" ] ]
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1401.0732
Young Kim Ph.D.
Seung Ho Choi and Young L. Kim
Hybridized/Coupled Multiple Resonances in Nacre
7 pages and 6 figures
Physical Review B 89, 035115 (2014)
10.1103/PhysRevB.89.035115
null
cond-mat.mes-hall physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We report that nacre (also known as mother-of-pearl), a wondrous nanocomposite found in nature, is a rich photonic nanomaterial allowing the experimental realization of collective excitation and light amplification via coupled states. Localized modes in three-dimensional complex media are typically isolated in frequency and space. However, multiple local resonances can be hybridized in multilayered nanostructures of nacre so that the effective cavity size for efficient disordered resonators is scaled up. Localized modes in hybridized states in nacre are overlapped in frequency with similar shapes in space, thus being collectively excited and synergistically amplified. These hybridized states boost light amplification, leading to stable and regular multimode lasing at low excitation energy. The simplicity of ameliorating disordered resonators by mimicking nacre can further serve as platforms for developing cost-effective photonic systems and provide materials for fundamental research on complex media
[ { "created": "Fri, 3 Jan 2014 21:15:06 GMT", "version": "v1" }, { "created": "Fri, 10 Jan 2014 21:24:30 GMT", "version": "v2" } ]
2014-01-14
[ [ "Choi", "Seung Ho", "" ], [ "Kim", "Young L.", "" ] ]
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1401.0733
Ahmet Iscen
Ahmet Iscen, Eren Golge, Ilker Sarac, Pinar Duygulu
ConceptVision: A Flexible Scene Classification Framework
null
null
null
null
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We introduce ConceptVision, a method that aims for high accuracy in categorizing large number of scenes, while keeping the model relatively simpler and efficient for scalability. The proposed method combines the advantages of both low-level representations and high-level semantic categories, and eliminates the distinctions between different levels through the definition of concepts. The proposed framework encodes the perspectives brought through different concepts by considering them in concept groups. Different perspectives are ensembled for the final decision. Extensive experiments are carried out on benchmark datasets to test the effects of different concepts, and methods used to ensemble. Comparisons with state-of-the-art studies show that we can achieve better results with incorporation of concepts in different levels with different perspectives.
[ { "created": "Fri, 3 Jan 2014 21:15:13 GMT", "version": "v1" }, { "created": "Wed, 29 Oct 2014 20:19:35 GMT", "version": "v2" } ]
2014-10-31
[ [ "Iscen", "Ahmet", "" ], [ "Golge", "Eren", "" ], [ "Sarac", "Ilker", "" ], [ "Duygulu", "Pinar", "" ] ]
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1401.0734
Megasthenis Asteris
Megasthenis Asteris, Alexandros G. Dimakis
Repairable Fountain Codes
To appear in IEEE Journal on Selected Areas in Communications, Issue on Communication Methodologies for Next-Generation Storage Systems 2013, 11 pages, 2 figures
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null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We introduce a new family of Fountain codes that are systematic and also have sparse parities. Given an input of $k$ symbols, our codes produce an unbounded number of output symbols, generating each parity independently by linearly combining a logarithmic number of randomly selected input symbols. The construction guarantees that for any $\epsilon>0$ accessing a random subset of $(1+\epsilon)k$ encoded symbols, asymptotically suffices to recover the $k$ input symbols with high probability. Our codes have the additional benefit of logarithmic locality: a single lost symbol can be repaired by accessing a subset of $O(\log k)$ of the remaining encoded symbols. This is a desired property for distributed storage systems where symbols are spread over a network of storage nodes. Beyond recovery upon loss, local reconstruction provides an efficient alternative for reading symbols that cannot be accessed directly. In our code, a logarithmic number of disjoint local groups is associated with each systematic symbol, allowing multiple parallel reads. Our main mathematical contribution involves analyzing the rank of sparse random matrices with specific structure over finite fields. We rely on establishing that a new family of sparse random bipartite graphs have perfect matchings with high probability.
[ { "created": "Fri, 3 Jan 2014 21:18:12 GMT", "version": "v1" } ]
2014-01-07
[ [ "Asteris", "Megasthenis", "" ], [ "Dimakis", "Alexandros G.", "" ] ]
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1401.0742
Ishanu Chattopadhyay
Ishanu Chattopadhyay and Hod Lipson
Data Smashing
null
null
null
null
cs.LG cs.AI cs.CE cs.IT math.IT stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Investigation of the underlying physics or biology from empirical data requires a quantifiable notion of similarity - when do two observed data sets indicate nearly identical generating processes, and when they do not. The discriminating characteristics to look for in data is often determined by heuristics designed by experts, $e.g.$, distinct shapes of "folded" lightcurves may be used as "features" to classify variable stars, while determination of pathological brain states might require a Fourier analysis of brainwave activity. Finding good features is non-trivial. Here, we propose a universal solution to this problem: we delineate a principle for quantifying similarity between sources of arbitrary data streams, without a priori knowledge, features or training. We uncover an algebraic structure on a space of symbolic models for quantized data, and show that such stochastic generators may be added and uniquely inverted; and that a model and its inverse always sum to the generator of flat white noise. Therefore, every data stream has an anti-stream: data generated by the inverse model. Similarity between two streams, then, is the degree to which one, when summed to the other's anti-stream, mutually annihilates all statistical structure to noise. We call this data smashing. We present diverse applications, including disambiguation of brainwaves pertaining to epileptic seizures, detection of anomalous cardiac rhythms, and classification of astronomical objects from raw photometry. In our examples, the data smashing principle, without access to any domain knowledge, meets or exceeds the performance of specialized algorithms tuned by domain experts.
[ { "created": "Fri, 3 Jan 2014 22:15:17 GMT", "version": "v1" } ]
2014-01-07
[ [ "Chattopadhyay", "Ishanu", "" ], [ "Lipson", "Hod", "" ] ]
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Data Smashing
http://arxiv.org/abs/1401.0742v1
http://arxiv.org/pdf/1401.0742v1.pdf
https://github.com/pslii/datasmash
false
false
https://paperswithcode.com/paper/data-smashing
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1401.0750
Junjian Qi
Junjian Qi, Kai Sun, and Shengwei Mei
An Interaction Model for Simulation and Mitigation of Cascading Failures
Accepted by IEEE Transactions on Power Systems
null
10.1109/TPWRS.2014.2337284
null
cs.SY physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper the interactions between component failures are quantified and the interaction matrix and interaction network are obtained. The quantified interactions can capture the general propagation patterns of the cascades from utilities or simulation, thus helping to better understand how cascading failures propagate and to identify key links and key components that are crucial for cascading failure propagation. By utilizing these interactions a high-level probabilistic model called interaction model is proposed to study the influence of interactions on cascading failure risk and to support online decision-making. It is much more time efficient to first quantify the interactions between component failures with fewer original cascades from a more detailed cascading failure model and then perform the interaction model simulation than it is to directly simulate a large number of cascades with a more detailed model. Interaction-based mitigation measures are suggested to mitigate cascading failure risk by weakening key links, which can be achieved in real systems by wide area protection such as blocking of some specific protective relays. The proposed interaction quantifying method and interaction model are validated with line outage data generated by the AC OPA cascading simulations on the IEEE 118-bus system.
[ { "created": "Fri, 3 Jan 2014 22:48:36 GMT", "version": "v1" }, { "created": "Wed, 16 Jul 2014 18:17:52 GMT", "version": "v2" }, { "created": "Mon, 4 Aug 2014 14:05:49 GMT", "version": "v3" }, { "created": "Sat, 23 Aug 2014 17:32:34 GMT", "version": "v4" } ]
2014-08-26
[ [ "Qi", "Junjian", "" ], [ "Sun", "Kai", "" ], [ "Mei", "Shengwei", "" ] ]
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1401.0757
Fathallah Alouani-Bibi Dr.
Fathallah Alouani-Bibi and Jakobus A. le Roux
Transport of cosmic-ray protons in intermittent heliospheric turbulence: model and simulations
54 pages, 16 figures, accepted for publication in ApJ
null
10.1088/0004-637X/781/2/93
null
astro-ph.HE physics.space-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The transport of charged energetic particles in the presence of strong intermittent heliospheric turbulence is computationally analyzed based on known properties of the interplanetary magnetic field and solar wind plasma at 1 Astronomical Unit (AU). The turbulence is assumed to be static, composite, and quasi-three-dimensional with a varying energy distribution between a one-dimensional Alfv\'enic (slab) and a structured two-dimensional component. The spatial fluctuations of the turbulent magnetic field are modeled either as homogeneous with a Gaussian probability distribution function (PDF), or as intermittent on large and small scales with a q-Gaussian PDF. Simulations showed that energetic particle diffusion coefficients both parallel and perpendicular to the background magnetic field are significantly affected by intermittency in the turbulence. This effect is especially strong for parallel transport where for large-scale intermittency results show an extended phase of subdiffusive parallel transport during which cross-field transport diffusion dominates. The effects of intermittency are found to depend on particle rigidity and the fraction of slab energy in the turbulence, yielding a perpendicular to parallel mean free path ratio close to 1 for large-scale intermittency. Investigation of higher order transport moments (kurtosis) indicates that non-Gaussian statistical properties of the intermittent turbulent magnetic field are present in the parallel transport, especially for low rigidity particles at all times.
[ { "created": "Sat, 4 Jan 2014 00:16:02 GMT", "version": "v1" } ]
2015-06-18
[ [ "Alouani-Bibi", "Fathallah", "" ], [ "Roux", "Jakobus A. le", "" ] ]
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1401.0758
Aaron Snook
Aaron Snook, Grant Schoenebeck, Paolo Codenotti
Graph Isomorphism and the Lasserre Hierarchy
22 pages, 3 figures, submitted to CCC
null
null
null
cs.CC math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we show lower bounds for a certain large class of algorithms solving the Graph Isomorphism problem, even on expander graph instances. Spielman [25] shows an algorithm for isomorphism of strongly regular expander graphs that runs in time exp(O(n^(1/3)) (this bound was recently improved to expf O(n^(1/5) [5]). It has since been an open question to remove the requirement that the graph be strongly regular. Recent algorithmic results show that for many problems the Lasserre hierarchy works surprisingly well when the underlying graph has expansion properties. Moreover, recent work of Atserias and Maneva [3] shows that k rounds of the Lasserre hierarchy is a generalization of the k-dimensional Weisfeiler-Lehman algorithm for Graph Isomorphism. These two facts combined make the Lasserre hierarchy a good candidate for solving graph isomorphism on expander graphs. Our main result rules out this promising direction by showing that even Omega(n) rounds of the Lasserre semidefinite program hierarchy fail to solve the Graph Isomorphism problem even on expander graphs.
[ { "created": "Sat, 4 Jan 2014 00:16:48 GMT", "version": "v1" } ]
2016-10-31
[ [ "Snook", "Aaron", "" ], [ "Schoenebeck", "Grant", "" ], [ "Codenotti", "Paolo", "" ] ]
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1401.0763
Sparsh Mittal
Sparsh Mittal
A Study of Successive Over-relaxation Method Parallelization Over Modern HPC Languages
null
null
null
null
cs.DC cs.MS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Successive over-relaxation (SOR) is a computationally intensive, yet extremely important iterative solver for solving linear systems. Due to recent trends of exponential growth in amount of data generated and increasing problem sizes, serial platforms have proved to be insufficient in providing the required computational power. In this paper, we present parallel implementations of red-black SOR method using three modern programming languages namely Chapel, D and Go. We employ SOR method for solving 2D steady-state heat conduction problem. We discuss the optimizations incorporated and the features of these languages which are crucial for improving the program performance. Experiments have been performed using 2, 4, and 8 threads and performance results are compared with serial execution. The analysis of results provides important insights into working of SOR method.
[ { "created": "Sat, 4 Jan 2014 01:31:48 GMT", "version": "v1" } ]
2014-01-07
[ [ "Mittal", "Sparsh", "" ] ]
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1401.0764
Chunhua Shen
Xi Li, Weiming Hu, Chunhua Shen, Anthony Dick, Zhongfei Zhang
Context-Aware Hypergraph Construction for Robust Spectral Clustering
10 pages. Appearing in IEEE TRANSACTIONS ON KNOWLEDGE AND DATA ENGINEERING: http://doi.ieeecomputersociety.org/10.1109/TKDE.2013.126
null
10.1109/TKDE.2013.126
null
cs.CV cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Spectral clustering is a powerful tool for unsupervised data analysis. In this paper, we propose a context-aware hypergraph similarity measure (CAHSM), which leads to robust spectral clustering in the case of noisy data. We construct three types of hypergraph---the pairwise hypergraph, the k-nearest-neighbor (kNN) hypergraph, and the high-order over-clustering hypergraph. The pairwise hypergraph captures the pairwise similarity of data points; the kNN hypergraph captures the neighborhood of each point; and the clustering hypergraph encodes high-order contexts within the dataset. By combining the affinity information from these three hypergraphs, the CAHSM algorithm is able to explore the intrinsic topological information of the dataset. Therefore, data clustering using CAHSM tends to be more robust. Considering the intra-cluster compactness and the inter-cluster separability of vertices, we further design a discriminative hypergraph partitioning criterion (DHPC). Using both CAHSM and DHPC, a robust spectral clustering algorithm is developed. Theoretical analysis and experimental evaluation demonstrate the effectiveness and robustness of the proposed algorithm.
[ { "created": "Sat, 4 Jan 2014 02:05:35 GMT", "version": "v1" } ]
2016-11-15
[ [ "Li", "Xi", "" ], [ "Hu", "Weiming", "" ], [ "Shen", "Chunhua", "" ], [ "Dick", "Anthony", "" ], [ "Zhang", "Zhongfei", "" ] ]
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1401.0765
Sparsh Mittal
Sparsh Mittal
A Survey of Techniques For Improving Energy Efficiency in Embedded Computing Systems
null
null
null
null
cs.AR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Recent technological advances have greatly improved the performance and features of embedded systems. With the number of just mobile devices now reaching nearly equal to the population of earth, embedded systems have truly become ubiquitous. These trends, however, have also made the task of managing their power consumption extremely challenging. In recent years, several techniques have been proposed to address this issue. In this paper, we survey the techniques for managing power consumption of embedded systems. We discuss the need of power management and provide a classification of the techniques on several important parameters to highlight their similarities and differences. This paper is intended to help the researchers and application-developers in gaining insights into the working of power management techniques and designing even more efficient high-performance embedded systems of tomorrow.
[ { "created": "Sat, 4 Jan 2014 02:06:23 GMT", "version": "v1" } ]
2014-01-07
[ [ "Mittal", "Sparsh", "" ] ]
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1401.0766
Joshua Cogliati
Joshua J. Cogliati, Kurt W. Derr, Jayson Wharton
Using CMOS Sensors in a Cellphone for Gamma Detection and Classification
null
null
null
null
physics.ins-det nucl-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The CMOS camera found in many cellphones is sensitive to ionized electrons. Gamma rays penetrate into the phone and produce ionized electrons that are then detected by the camera. Thermal noise and other noise needs to be removed on the phone, which requires an algorithm that has relatively low memory and computational requirements. The continuous high-delta algorithm described fits those requirements. Only a small fraction of the energy of even the electron is deposited in the camera sensor, so direct methods of measuring the energy cannot be used. The fraction of groups of lit up pixels that are lines is correlated with the energy of the gamma rays. This correlation under certain conditions allows limited low resolution energy resolution to be performed.
[ { "created": "Sat, 4 Jan 2014 02:23:02 GMT", "version": "v1" } ]
2014-01-07
[ [ "Cogliati", "Joshua J.", "" ], [ "Derr", "Kurt W.", "" ], [ "Wharton", "Jayson", "" ] ]
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Using CMOS Sensors in a Cellphone for Gamma Detection and Classification
https://arxiv.org/abs/1401.0766v1
https://arxiv.org/pdf/1401.0766v1.pdf
https://github.com/waagsociety/GammaSense-algo
false
false
https://paperswithcode.com/paper/using-cmos-sensors-in-a-cellphone-for-gamma
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1401.0767
Chunhua Shen
Chunhua Shen, Fayao Liu
From Kernel Machines to Ensemble Learning
null
null
null
null
cs.LG cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Ensemble methods such as boosting combine multiple learners to obtain better prediction than could be obtained from any individual learner. Here we propose a principled framework for directly constructing ensemble learning methods from kernel methods. Unlike previous studies showing the equivalence between boosting and support vector machines (SVMs), which needs a translation procedure, we show that it is possible to design boosting-like procedure to solve the SVM optimization problems. In other words, it is possible to design ensemble methods directly from SVM without any middle procedure. This finding not only enables us to design new ensemble learning methods directly from kernel methods, but also makes it possible to take advantage of those highly-optimized fast linear SVM solvers for ensemble learning. We exemplify this framework for designing binary ensemble learning as well as a new multi-class ensemble learning methods. Experimental results demonstrate the flexibility and usefulness of the proposed framework.
[ { "created": "Sat, 4 Jan 2014 02:28:48 GMT", "version": "v1" } ]
2014-01-07
[ [ "Shen", "Chunhua", "" ], [ "Liu", "Fayao", "" ] ]
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1401.0778
Hua-Wei Shen
Hua-Wei Shen, Dashun Wang, Chaoming Song, Albert-L\'aszl\'o Barab\'asi
Modeling and Predicting Popularity Dynamics via Reinforced Poisson Processes
8 pages, 5 figure; 3 tables
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null
null
cs.SI physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
An ability to predict the popularity dynamics of individual items within a complex evolving system has important implications in an array of areas. Here we propose a generative probabilistic framework using a reinforced Poisson process to model explicitly the process through which individual items gain their popularity. This model distinguishes itself from existing models via its capability of modeling the arrival process of popularity and its remarkable power at predicting the popularity of individual items. It possesses the flexibility of applying Bayesian treatment to further improve the predictive power using a conjugate prior. Extensive experiments on a longitudinal citation dataset demonstrate that this model consistently outperforms existing popularity prediction methods.
[ { "created": "Sat, 4 Jan 2014 05:53:18 GMT", "version": "v1" } ]
2014-01-07
[ [ "Shen", "Hua-Wei", "" ], [ "Wang", "Dashun", "" ], [ "Song", "Chaoming", "" ], [ "Barabási", "Albert-László", "" ] ]
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1401.0781
Zizhan Zheng
Zizhan Zheng, Zhixue Lu, Prasun Sinha, Santosh Kumar
Ensuring Predictable Contact Opportunity for Scalable Vehicular Internet Access On the Go
Technical report - this work was submitted to IEEE/ACM Transactions on Networking, June 2013
null
10.1109/TNET.2014.2309991
null
cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
With increasing popularity of media enabled hand-helds and their integration with the in-vehicle entertainment systems, the need for high data-rate services for mobile users on the go is evident. This ever-increasing demand of data is constantly surpassing what cellular networks can economically support. Large-scale Wireless LANs (WLANs) can provide such a service, but they are expensive to deploy and maintain. Open WLAN access-points, on the other hand, need no new deployments, but can offer only opportunistic services, lacking any performance guarantees. In contrast, a carefully planned sparse deployment of roadside WiFi provides an economically scalable infrastructure with quality of service assurance to mobile users. In this paper, we present a new metric, called Contact Opportunity, to closely model the quality of data service that a mobile user might experience when driving through the system. We then present efficient deployment algorithms for minimizing the cost for ensuring a required level of contact opportunity. We further extend this concept and the deployment techniques to a more intuitive metric -- the average throughput -- by taking various dynamic elements into account. Simulations over a real road network and experimental results show that our approach achieves significantly better cost vs. throughput tradeoff in both the worst case and average case compared with some commonly used deployment algorithms.
[ { "created": "Sat, 4 Jan 2014 06:22:05 GMT", "version": "v1" } ]
2016-11-15
[ [ "Zheng", "Zizhan", "" ], [ "Lu", "Zhixue", "" ], [ "Sinha", "Prasun", "" ], [ "Kumar", "Santosh", "" ] ]
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1401.0786
Guihua Chen
Guihua Chen, Shaoqiang Zhang, and Muying Wu
Optical Solitons in a Trinal-channel Inverted Nonlinear Photonic Crystal
null
Journal of Nonlinear Optical Physics & Materials Vol. 22, No. 1 (2013) 1350012
10.1142/S0218863513500124
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Inverted nonlinear photonic crystals are the crystals featuring competition between linear and nonlinear lattices, with minima of the linear potential coinciding with maxima of the nonlinear pseudopotential, and vice versa. Traditional inverted nonlinear photonic crystals only have two channels, and can be attained experimentally by means of Rhodamine B (RhB, a dye featuring saturable absorption) doped into the SU-8 polymer. In this paper, a new type of inverted nonlinear photonic crystal is constructed by juxtaposing three kinds of channels into a period. These three channels are a purely linear channel, a saturable self-focusing nonlinear channel, and a saturable self-defocusing nonlinear channel. This optical device is assumed to be fabricated by means of SU-8 polymer material periodically doped with two types of active dyes. The nonlinear propagation of a light field inside this device (passing along the channel) can be described by a nonlinear Schrodinger equation. Stable multi-peak fundamental and dipole solitons are found in the first gap of the system. These solitons sufficiently exhibit some interesting digital properties, which may have potential in optical communications.
[ { "created": "Sat, 4 Jan 2014 07:26:09 GMT", "version": "v1" } ]
2014-01-07
[ [ "Chen", "Guihua", "" ], [ "Zhang", "Shaoqiang", "" ], [ "Wu", "Muying", "" ] ]
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1401.0790
Atsushi Horikoshi
Atsushi Horikoshi
A Formulation of the Ring Polymer Molecular Dynamics
13 pages, 2 figures
Molecular Simulation, Vol.38, No.5, pp.389-396 (2012)
null
null
quant-ph cond-mat.stat-mech physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The exact formulation of the path integral centroid dynamics is extended to include composites of the position and momentum operators. We present the generalized centroid dynamics (GCD), which provides a basis to calculate Kubo-transformed correlation functions by means of classical averages. We define various types of approximate GCD, one of which is equivalent to the ring polymer molecular dynamics (RPMD). The RPMD and another approximate GCD are tested in one-dimensional harmonic system, and it is shown that the RPMD works better in the short time region.
[ { "created": "Sat, 4 Jan 2014 08:09:01 GMT", "version": "v1" } ]
2014-01-28
[ [ "Horikoshi", "Atsushi", "" ] ]
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1401.0794
Taraka Rama Kasicheyanula
Taraka Rama, Lars Borin
Properties of phoneme N -grams across the world's language families
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null
null
null
cs.CL stat.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this article, we investigate the properties of phoneme N-grams across half of the world's languages. We investigate if the sizes of three different N-gram distributions of the world's language families obey a power law. Further, the N-gram distributions of language families parallel the sizes of the families, which seem to obey a power law distribution. The correlation between N-gram distributions and language family sizes improves with increasing values of N. We applied statistical tests, originally given by physicists, to test the hypothesis of power law fit to twelve different datasets. The study also raises some new questions about the use of N-gram distributions in linguistic research, which we answer by running a statistical test.
[ { "created": "Sat, 4 Jan 2014 09:50:55 GMT", "version": "v1" } ]
2014-01-07
[ [ "Rama", "Taraka", "" ], [ "Borin", "Lars", "" ] ]
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1401.0798
Petr Vabishchevich N.
Petr Vabishchevich and Petr Zakharov
Domain decomposition methods with overlapping subdomains for time-dependent problems
8 pages
null
null
null
cs.NA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Domain decomposition (DD) methods for solving time-dependent problems can be classified by (i) the method of domain decomposition used, (ii) the choice of decomposition operators (exchange of boundary conditions), and (iii) the splitting scheme employed. To construct homogeneous numerical algorithms, overlapping subdomain methods are preferable. Domain decomposition is associated with the corresponding additive representation of the problem operator. To solve time-dependent problems with the DD splitting, different operator-splitting schemes are used. Various variants of decomposition operators differ by distinct types of data exchanges on interfaces. They ensure the convergence of the approximate solution in various spaces of grid functions.
[ { "created": "Sat, 4 Jan 2014 11:06:43 GMT", "version": "v1" }, { "created": "Thu, 10 Jul 2014 06:35:25 GMT", "version": "v2" } ]
2014-07-11
[ [ "Vabishchevich", "Petr", "" ], [ "Zakharov", "Petr", "" ] ]
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1401.0799
Tobias Kretz
Tobias Kretz, Karsten Lehmann, Ingmar Hofs\"a{\ss}
User Equilibrium Route Assignment for Microscopic Pedestrian Simulation
null
Advances in Complex Systems 17(2) pp. 1450010 (2014)
10.1142/S0219525914500106
null
physics.soc-ph cs.CE cs.MA cs.RO physics.comp-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
For the simulation of pedestrians a method is introduced to find routing alternatives from any origin position to a given destination area in a given geometry composed of walking areas and obstacles. The method includes a parameter which sets a threshold for the approximate minimum size of obstacles to generate routing alternatives. The resulting data structure for navigation is constructed such that it does not introduce artifacts to the movement of simulated pedestrians and that locally pedestrians prefer to walk on the shortest path. The generated set of routes can be used with iterating static or dynamic assignment methods.
[ { "created": "Sat, 4 Jan 2014 11:25:29 GMT", "version": "v1" } ]
2014-07-15
[ [ "Kretz", "Tobias", "" ], [ "Lehmann", "Karsten", "" ], [ "Hofsäß", "Ingmar", "" ] ]
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1401.0802
Michael Gr. Voskoglou Prof. Dr.
Michael Gr. Voskoglou
A stochastic model for Case-Based Reasoning
7 pages, 2 figures
Journal of Mathematical Modelling and Application, 1(3), 33-39, 2010
null
null
cs.AI math.PR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Case-Bsed Reasoning (CBR) is a recent theory for problem-solving and learning in computers and people.Broadly construed it is the process of solving new problems based on the solution of similar past problems. In the present paper we introduce an absorbing Markov chain on the main steps of the CBR process.In this way we succeed in obtaining the probabilities for the above process to be in a certain step at a certain phase of the solution of the corresponding problem, and a measure for the efficiency of a CBR system. Examples are given to illustrate our results.
[ { "created": "Sat, 4 Jan 2014 12:00:59 GMT", "version": "v1" } ]
2014-01-07
[ [ "Voskoglou", "Michael Gr.", "" ] ]
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1401.0805
Heidi Reinholz
H. Reinholz, G. R\"opke, S. Rosmej, R. Redmer
Warm dense matter conductivity including electron-electron collisions
21 pages, 4 figures
null
null
null
physics.plasm-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The controversy with respect to the role of electron-electron collisions in the dynamic conductivity of dense plasmas is resolved. In particular, the dc conductivity is analyzed in the low-density, non-degenerate limit where the Spitzer theory is valid and electron-electron collisions lead to the well-known reduction of the result for a Lorentz plasma. With increasing degeneracy, the contribution of electron-electron collisions to the dc conductivity is decreasing and can be neglected for the liquid metal domain where the Ziman-Faber theory is applicable. We show how electron-electron collisions have to be implemented in calculations based on the Kubo-Greenwood formula which is prevalently applied in simulations for the frequency-dependent conductivity in the warm dense matter region, i.e. for arbitrary degeneracy.
[ { "created": "Sat, 4 Jan 2014 12:21:57 GMT", "version": "v1" }, { "created": "Tue, 20 Jan 2015 14:13:54 GMT", "version": "v2" }, { "created": "Sun, 25 Jan 2015 01:32:36 GMT", "version": "v3" } ]
2015-01-27
[ [ "Reinholz", "H.", "" ], [ "Röpke", "G.", "" ], [ "Rosmej", "S.", "" ], [ "Redmer", "R.", "" ] ]
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1401.0814
Qi Guo
Guo Liang and Qi Guo
Application of canonical Hamiltonian formulation to nonlinear light-envelope propagations
15 pages, 1 figure
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nlin.PS math-ph math.MP physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We first point out it is conditional to apply the variational approach to the nonlocal nonlinear Schr\"{o}dinger equation (NNLSE), that is, the response function must be an even function. Different from the variational approach, the canonical Hamiltonian formulation for the first-order differential system are used to deal with the problems of the nonlinear light-envelope propagations. The Hamiltonian of the system modeled by the NNLSE is obtained, which can be expressed as the sum of the generalized kinetic energy and the generalized potential. The solitons correspond to extreme points of the generalized potential. The stabilities of solitons in both local and nonlocal nonlinear media are also investigated by the analysis of the generalized potential. They are stable when the potential has minimum, and unstable otherwise.
[ { "created": "Sat, 4 Jan 2014 14:10:22 GMT", "version": "v1" } ]
2014-01-07
[ [ "Liang", "Guo", "" ], [ "Guo", "Qi", "" ] ]
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1401.0818
Qiang Huo
Qiang Huo, Tianxi Liu, Shaohui Sun, Lingyang Song, and Bingli Jiao
Selective Combining for Hybrid Cooperative Networks
27 pages, 8 figures, IET Communications, 2014
IET Communication, Vol. 8, Iss. 4, pp. 471--482, 2014
10.1049/iet-com.2013.0323
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this study, we consider the selective combining in hybrid cooperative networks (SCHCNs scheme) with one source node, one destination node and $N$ relay nodes. In the SCHCN scheme, each relay first adaptively chooses between amplify-and-forward protocol and decode-and-forward protocol on a per frame basis by examining the error-detecting code result, and $N_c$ ($1\leq N_c \leq N$) relays will be selected to forward their received signals to the destination. We first develop a signal-to-noise ratio (SNR) threshold-based frame error rate (FER) approximation model. Then, the theoretical FER expressions for the SCHCN scheme are derived by utilizing the proposed SNR threshold-based FER approximation model. The analytical FER expressions are validated through simulation results.
[ { "created": "Sat, 4 Jan 2014 15:19:56 GMT", "version": "v1" } ]
2016-02-02
[ [ "Huo", "Qiang", "" ], [ "Liu", "Tianxi", "" ], [ "Sun", "Shaohui", "" ], [ "Song", "Lingyang", "" ], [ "Jiao", "Bingli", "" ] ]
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1401.0821
Madhumangal Pal Dr.
Rajkumar Pradhan and Madhumangal Pal
Intuitionistic Fuzzy Linear Transformations
12 pages,24 references
Annals of Pure and Applied Mathematics, vol. 1, no. 1, (2012) 57-68
null
null
cs.DM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we discussed about the intuitionistic fuzzy linear transformations (IFLT) and shown that the set of all linear transformations L(V) defined over an intuitionistic fuzzy vector space V does not form an vector space. Here we determine the unique intuitionistic fuzzy matrix associated with an intuitionistic fuzzy linear transformation with respect to an ordered standard basis for an intuitionistic fuzzy vector space. We introduced the concept of the inverse of an IFLT.
[ { "created": "Sat, 4 Jan 2014 15:41:27 GMT", "version": "v1" } ]
2014-01-07
[ [ "Pradhan", "Rajkumar", "" ], [ "Pal", "Madhumangal", "" ] ]
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1401.0823
Madhumangal Pal Dr.
Hossein Rashmanlou and Madhumangal Pal
Antipodal Interval-Valued Fuzzy Graphs
24 pages; 9 figures; 32 referenes
International Journal of Applications of Fuzzy Sets and Artificial Intelligence (ISSN 2241-1240), Vol. 3 ( 2013), 107-130
null
null
cs.DM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Concepts of graph theory have applications in many areas of computer science including data mining, image segmentation, clustering, image capturing, networks, etc . An interval-valued fuzzy set is a generalization of the notion of a fuzzy set. Interval-valued fuzzy models give more precision, flexibility and compatibility to the system as compared to the fuzzy models. In this paper, we introduce the concept of antipodal interval - valued fuzzy graph and self median interval-valued fuzzy graph of the given interval-valued fuzzy graph. We investigate isomorphism properties of antipodal interval - valued fuzzy graphs.
[ { "created": "Sat, 4 Jan 2014 15:45:34 GMT", "version": "v1" } ]
2014-01-07
[ [ "Rashmanlou", "Hossein", "" ], [ "Pal", "Madhumangal", "" ] ]
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1401.0827
Kamel Ibn Aziz Derouiche kiaderouiche
K.I.A.Derouiche
Interaction entre math\'ematique et informatique Libre/Open Source par le logiciel math\'ematique
11 pages, written in French, In Proceedings of the S\'eminaire National sur la didactique des Math\'ematiques, 25-26 Novembre Tebessa, Alg\'erie (SNDM'13). 2013
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null
null
cs.MS cs.CY math.HO
http://creativecommons.org/licenses/by/3.0/
This article focuses on the application of model development and opening the source code available and implemented by the Free Software and Open Source FLOSS to the instructional and teaching has both mathematics and computer by the read-write(R/W) of mathematical software, including the most famous cases are numerical and symbolic computation. The article analysis the development of the mathematical model of Free/Open Source(math FLOSS) software has proven its importance in the area of research in mathematics and computer science . However, although their actual use, is very readable in higher education courses. We discuss the feasibility of this model to the characteristics of the domain, actors, interaction they have and the communities they form during the development of the software. Finally, we propose a mathematical example of Free/Open Source(Math FlOSS) software as analysis device .
[ { "created": "Sat, 4 Jan 2014 16:42:05 GMT", "version": "v1" } ]
2014-01-07
[ [ "Derouiche", "K. I. A.", "" ] ]
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1401.0833
Dibyendu Roy
Dibyendu Roy and Nilanjan Bondyopadhaya
Statistics of scattered photons from a driven three-level emitter in a one-dimensional open space
10 pages, 4 figures
Phys. Rev. A 89, 043806 (2014)
10.1103/PhysRevA.89.043806
LA-UR-14-20057
physics.optics physics.atom-ph quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We derive the statistics of scattered photons from a $\Lambda$- or ladder-type three-level emitter (3LE) embedded in a 1D open waveguide. The weak probe photons in the waveguide are coupled to one of the two allowed transitions of the 3LE, and the other transition is driven by a control beam. This system shows electromagnetically induced transparency (EIT) which is accompanied with the Autler-Townes splitting (ATS) at a strong driving by the control beam, and some of these effects have been observed recently. We show that the nature of second-order coherence of the transmitted probe photons near two-photon resonance changes from bunching to antibunching to constant as strength of the control beam is ramped up from zero to a higher value where the ATS appears.
[ { "created": "Sat, 4 Jan 2014 18:14:08 GMT", "version": "v1" }, { "created": "Mon, 12 May 2014 23:35:41 GMT", "version": "v2" } ]
2014-05-14
[ [ "Roy", "Dibyendu", "" ], [ "Bondyopadhaya", "Nilanjan", "" ] ]
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1401.0836
Petros Petrosyan
Petros A. Petrosyan
Sequential edge-coloring on the subset of vertices of almost regular graphs
4 pages
null
null
null
math.CO cs.DM
http://creativecommons.org/licenses/by/3.0/
Let $G$ be a graph and $R\subseteq V(G)$. A proper edge-coloring of a graph $G$ with colors $1,\ldots,t$ is called an $R$-sequential $t$-coloring if the edges incident to each vertex $v\in R$ are colored by the colors $1,\ldots,d_{G}(v)$, where $d_{G}(v)$ is the degree of the vertex $v$ in $G$. In this note, we show that if $G$ is a graph with $\Delta(G)-\delta(G)\leq 1$ and $\chi^{\prime}(G)=\Delta(G)=r$ ($r\geq 3$), then $G$ has an $R$-sequential $r$-coloring with $\vert R\vert \geq \left\lceil\frac{(r-1)n_{r}+n}{r}\right\rceil$, where $n=\vert V(G)\vert$ and $n_{r}=\vert\{v\in V(G):d_{G}(v)=r\}\vert$. As a corollary, we obtain the following result: if $G$ is a graph with $\Delta(G)-\delta(G)\leq 1$ and $\chi^{\prime}(G)=\Delta(G)=r$ ($r\geq 3$), then $\Sigma^{\prime}(G)\leq \left\lfloor\frac {2n_{r}(2r-1)+n(r-1)(r^{2}+2r-2)}{4r}\right\rfloor$, where $\Sigma^{\prime}(G)$ is the edge-chromatic sum of $G$.
[ { "created": "Sat, 4 Jan 2014 18:48:01 GMT", "version": "v1" } ]
2014-01-07
[ [ "Petrosyan", "Petros A.", "" ] ]
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1401.0838
Brendan Godfrey
Brendan B. Godfrey and Jean-Luc Vay
Suppressing the Numerical Cherenkov Instability in FDTD PIC Codes
13 pages, 5 figures
Journal of Compujtational Physics 261, 1-6 (2014)
10.1016/j.jcp.2014.02.022
null
physics.plasm-ph math.NA physics.acc-ph physics.comp-ph
http://creativecommons.org/licenses/by-nc-sa/3.0/
A procedure for largely suppressing the numerical Cherenkov instability in finite difference time-domain (FDTD) particle-in-cell (PIC) simulations of cold, relativistic beams is derived, and residual growth rates computed and compared with WARP code simulation results. Sample laser-plasma acceleration simulation output is provided to further validate the new procedure.
[ { "created": "Sat, 4 Jan 2014 19:02:27 GMT", "version": "v1" } ]
2014-07-29
[ [ "Godfrey", "Brendan B.", "" ], [ "Vay", "Jean-Luc", "" ] ]
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1401.0839
Marco Alberto Javarone
Marco Alberto Javarone
Social Influences in Opinion Dynamics: the Role of Conformity
22 pages, 12 figures, appears in Physica A: Statistical Mechanics and its Applications (volume 414) 2014
null
10.1016/j.physa.2014.07.018
null
physics.soc-ph cs.SI nlin.AO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the effects of social influences in opinion dynamics. In particular, we define a simple model, based on the majority rule voting, in order to consider the role of conformity. Conformity is a central issue in social psychology as it represents one of people's behaviors that emerges as a result of their interactions. The proposed model represents agents, arranged in a network and provided with an individual behavior, that change opinion in function of those of their neighbors. In particular, agents can behave as conformists or as nonconformists. In the former case, agents change opinion in accordance with the majority of their social circle (i.e., their neighbors); in the latter case, they do the opposite, i.e., they take the minority opinion. Moreover, we investigate the nonconformity both on a global and on a local perspective, i.e., in relation to the whole population and to the social circle of each nonconformist agent, respectively. We perform a computational study of the proposed model, with the aim to observe if and how the conformity affects the related outcomes. Moreover, we want to investigate whether it is possible to achieve some kind of equilibrium, or of order, during the evolution of the system. Results highlight that the amount of nonconformist agents in the population plays a central role in these dynamics. In particular, conformist agents play the role of stabilizers in fully-connected networks, whereas the opposite happens in complex networks. Furthermore, by analyzing complex topologies of the agent network, we found that in the presence of radical nonconformist agents the topology of the system has a prominent role; otherwise it does not matter since we observed that a conformist behavior is almost always more convenient. Finally, we analyze the results of the model by considering that agents can change also their behavior over time.
[ { "created": "Sat, 4 Jan 2014 19:13:11 GMT", "version": "v1" }, { "created": "Fri, 15 Aug 2014 07:29:50 GMT", "version": "v2" } ]
2014-08-18
[ [ "Javarone", "Marco Alberto", "" ] ]
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1401.0843
Warren Powell
Warren R. Scott, Warren B. Powell, Somayeh Moazehi
Least Squares Policy Iteration with Instrumental Variables vs. Direct Policy Search: Comparison Against Optimal Benchmarks Using Energy Storage
37 pages, 9 figures
null
null
null
math.OC cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper studies approximate policy iteration (API) methods which use least-squares Bellman error minimization for policy evaluation. We address several of its enhancements, namely, Bellman error minimization using instrumental variables, least-squares projected Bellman error minimization, and projected Bellman error minimization using instrumental variables. We prove that for a general discrete-time stochastic control problem, Bellman error minimization using instrumental variables is equivalent to both variants of projected Bellman error minimization. An alternative to these API methods is direct policy search based on knowledge gradient. The practical performance of these three approximate dynamic programming methods are then investigated in the context of an application in energy storage, integrated with an intermittent wind energy supply to fully serve a stochastic time-varying electricity demand. We create a library of test problems using real-world data and apply value iteration to find their optimal policies. These benchmarks are then used to compare the developed policies. Our analysis indicates that API with instrumental variables Bellman error minimization prominently outperforms API with least-squares Bellman error minimization. However, these approaches underperform our direct policy search implementation.
[ { "created": "Sat, 4 Jan 2014 19:57:26 GMT", "version": "v1" } ]
2014-01-07
[ [ "Scott", "Warren R.", "" ], [ "Powell", "Warren B.", "" ], [ "Moazehi", "Somayeh", "" ] ]
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1401.0852
Qing Zhou
Bryon Aragam and Qing Zhou
Concave Penalized Estimation of Sparse Gaussian Bayesian Networks
57 pages
Journal of Machine Learning Research 16(Nov):2273-2328, 2015
null
null
stat.ME cs.LG stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We develop a penalized likelihood estimation framework to estimate the structure of Gaussian Bayesian networks from observational data. In contrast to recent methods which accelerate the learning problem by restricting the search space, our main contribution is a fast algorithm for score-based structure learning which does not restrict the search space in any way and works on high-dimensional datasets with thousands of variables. Our use of concave regularization, as opposed to the more popular $\ell_0$ (e.g. BIC) penalty, is new. Moreover, we provide theoretical guarantees which generalize existing asymptotic results when the underlying distribution is Gaussian. Most notably, our framework does not require the existence of a so-called faithful DAG representation, and as a result the theory must handle the inherent nonidentifiability of the estimation problem in a novel way. Finally, as a matter of independent interest, we provide a comprehensive comparison of our approach to several standard structure learning methods using open-source packages developed for the R language. Based on these experiments, we show that our algorithm is significantly faster than other competing methods while obtaining higher sensitivity with comparable false discovery rates for high-dimensional data. In particular, the total runtime for our method to generate a solution path of 20 estimates for DAGs with 8000 nodes is around one hour.
[ { "created": "Sat, 4 Jan 2014 23:27:48 GMT", "version": "v1" }, { "created": "Sun, 4 Jan 2015 23:34:01 GMT", "version": "v2" } ]
2015-12-24
[ [ "Aragam", "Bryon", "" ], [ "Zhou", "Qing", "" ] ]
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1401.0855
Jie Xu
Jie Xu, Yiannis Andrepoulos, Yuanzhang Xiao, Mihaela van der Schaar
Non-stationary Resource Allocation Policies for Delay-constrained Video Streaming: Application to Video over Internet-of-Things-enabled Networks
null
null
null
null
cs.NI cs.MM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Due to the high bandwidth requirements and stringent delay constraints of multi-user wireless video transmission applications, ensuring that all video senders have sufficient transmission opportunities to use before their delay deadlines expire is a longstanding research problem. We propose a novel solution that addresses this problem without assuming detailed packet-level knowledge, which is unavailable at resource allocation time. Instead, we translate the transmission delay deadlines of each sender's video packets into a monotonically-decreasing weight distribution within the considered time horizon. Higher weights are assigned to the slots that have higher probability for deadline-abiding delivery. Given the sets of weights of the senders' video streams, we propose the low-complexity Delay-Aware Resource Allocation (DARA) approach to compute the optimal slot allocation policy that maximizes the deadline-abiding delivery of all senders. A unique characteristic of the DARA approach is that it yields a non-stationary slot allocation policy that depends on the allocation of previous slots. We prove that the DARA approach is optimal for weight distributions that are exponentially decreasing in time. We further implement our framework for real-time video streaming in wireless personal area networks that are gaining significant traction within the new Internet-of-Things (IoT) paradigm. For multiple surveillance videos encoded with H.264/AVC and streamed via the 6tisch framework that simulates the IoT-oriented IEEE 802.15.4e TSCH medium access control, our solution is shown to be the only one that ensures all video bitstreams are delivered with acceptable quality in a deadline-abiding manner.
[ { "created": "Sun, 5 Jan 2014 00:49:22 GMT", "version": "v1" } ]
2014-01-07
[ [ "Xu", "Jie", "" ], [ "Andrepoulos", "Yiannis", "" ], [ "Xiao", "Yuanzhang", "" ], [ "van der Schaar", "Mihaela", "" ] ]
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1401.0858
Videh Seksaria
Videh Seksaria
Multimodal Optimization by Sparkling Squid Populations
19 pages, 4 figues
null
null
null
cs.NE
http://creativecommons.org/licenses/by-nc-sa/3.0/
The swarm intelligence of animals is a natural paradigm to apply to optimization problems. Ant colony, bee colony, firefly and bat algorithms are amongst those that have been demonstrated to efficiently to optimize complex constraints. This paper proposes the new Sparkling Squid Algorithm (SSA) for multimodal optimization, inspired by the intelligent swarm behavior of its namesake. After an introduction, formulation and discussion of its implementation, it will be compared to other popular metaheuristics. Finally, applications to well - known problems such as image registration and the traveling salesperson problem will be discussed.
[ { "created": "Sun, 5 Jan 2014 01:37:45 GMT", "version": "v1" } ]
2014-01-07
[ [ "Seksaria", "Videh", "" ] ]
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1401.0861
Jaret Heise
J. Heise
The Sanford Underground Research Facility at Homestake
14 pages, 10 figures, Proceedings of the VII International Conference on Interconnections between Particle Physics and Cosmology (PPC2013), Deadwood, SD, July 8-13, 2013
AIP Conf. Proc. 1604 331-344 (2014)
10.1063/1.4883449
null
physics.ins-det hep-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The former Homestake gold mine in Lead, South Dakota is being transformed into a dedicated laboratory to pursue underground research in rare-process physics, as well as offering research opportunities in other disciplines such as biology, geology and engineering. A key component of the Sanford Underground Research Facility (SURF) is the Davis Campus, which is in operation at the 4850-foot level (4300 m.w.e) and currently hosts three projects: the LUX dark matter experiment, the MAJORANA DEMONSTRATOR neutrinoless double-beta decay experiment and the CUBED low-background counter. Plans for possible future experiments at SURF are well underway and include long baseline neutrino oscillation experiments, future dark matter experiments as well as nuclear astrophysics accelerators. Facility upgrades to accommodate some of these future projects have already started. SURF is a dedicated facility with significant expansion capability.
[ { "created": "Sun, 5 Jan 2014 02:20:11 GMT", "version": "v1" } ]
2015-06-18
[ [ "Heise", "J.", "" ] ]
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1401.0864
Maryam Khademi
Mingming Fan, Maryam Khademi
Predicting a Business Star in Yelp from Its Reviews Text Alone
5 pages, 6 figures, 2 tables
null
null
null
cs.IR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Yelp online reviews are invaluable source of information for users to choose where to visit or what to eat among numerous available options. But due to overwhelming number of reviews, it is almost impossible for users to go through all reviews and find the information they are looking for. To provide a business overview, one solution is to give the business a 1-5 star(s). This rating can be subjective and biased toward users personality. In this paper, we predict a business rating based on user-generated reviews texts alone. This not only provides an overview of plentiful long review texts but also cancels out subjectivity. Selecting the restaurant category from Yelp Dataset Challenge, we use a combination of three feature generation methods as well as four machine learning models to find the best prediction result. Our approach is to create bag of words from the top frequent words in all raw text reviews, or top frequent words/adjectives from results of Part-of-Speech analysis. Our results show Root Mean Square Error (RMSE) of 0.6 for the combination of Linear Regression with either of the top frequent words from raw data or top frequent adjectives after Part-of-Speech (POS).
[ { "created": "Sun, 5 Jan 2014 03:29:05 GMT", "version": "v1" } ]
2014-01-07
[ [ "Fan", "Mingming", "" ], [ "Khademi", "Maryam", "" ] ]
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1401.0869
Zhaosong Lu
Zhaosong Lu and Yong Zhang
Schatten-$p$ Quasi-Norm Regularized Matrix Optimization via Iterative Reweighted Singular Value Minimization
This paper has been withdrawn by the author due to major revision and corrections
null
null
null
math.OC cs.LG math.NA stat.CO stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we study general Schatten-$p$ quasi-norm (SPQN) regularized matrix minimization problems. In particular, we first introduce a class of first-order stationary points for them, and show that the first-order stationary points introduced in [11] for an SPQN regularized $vector$ minimization problem are equivalent to those of an SPQN regularized $matrix$ minimization reformulation. We also show that any local minimizer of the SPQN regularized matrix minimization problems must be a first-order stationary point. Moreover, we derive lower bounds for nonzero singular values of the first-order stationary points and hence also of the local minimizers of the SPQN regularized matrix minimization problems. The iterative reweighted singular value minimization (IRSVM) methods are then proposed to solve these problems, whose subproblems are shown to have a closed-form solution. In contrast to the analogous methods for the SPQN regularized $vector$ minimization problems, the convergence analysis of these methods is significantly more challenging. We develop a novel approach to establishing the convergence of these methods, which makes use of the expression of a specific solution of their subproblems and avoids the intricate issue of finding the explicit expression for the Clarke subdifferential of the objective of their subproblems. In particular, we show that any accumulation point of the sequence generated by the IRSVM methods is a first-order stationary point of the problems. Our computational results demonstrate that the IRSVM methods generally outperform some recently developed state-of-the-art methods in terms of solution quality and/or speed.
[ { "created": "Sun, 5 Jan 2014 06:37:50 GMT", "version": "v1" }, { "created": "Tue, 24 Nov 2015 18:41:44 GMT", "version": "v2" }, { "created": "Mon, 31 Oct 2016 17:30:58 GMT", "version": "v3" } ]
2016-11-01
[ [ "Lu", "Zhaosong", "" ], [ "Zhang", "Yong", "" ] ]
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1401.0870
Laurence Aroquiaraj
I. Laurence Aroquiaraj and K. Thangavel
Pectoral Muscles Suppression in Digital Mammograms using Hybridization of Soft Computing Methods
8 pages, 6 figures
null
null
null
cs.CV cs.CE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Breast region segmentation is an essential prerequisite in computerized analysis of mammograms. It aims at separating the breast tissue from the background of the mammogram and it includes two independent segmentations. The first segments the background region which usually contains annotations, labels and frames from the whole breast region, while the second removes the pectoral muscle portion (present in Medio Lateral Oblique (MLO) views) from the rest of the breast tissue. In this paper we propose hybridization of Connected Component Labeling (CCL), Fuzzy, and Straight line methods. Our proposed methods worked good for separating pectoral region. After removal pectoral muscle from the mammogram, further processing is confined to the breast region alone. To demonstrate the validity of our segmentation algorithm, it is extensively tested using over 322 mammographic images from the Mammographic Image Analysis Society (MIAS) database. The segmentation results were evaluated using a Mean Absolute Error (MAE), Hausdroff Distance (HD), Probabilistic Rand Index (PRI), Local Consistency Error (LCE) and Tanimoto Coefficient (TC). The hybridization of fuzzy with straight line method is given more than 96% of the curve segmentations to be adequate or better. In addition a comparison with similar approaches from the state of the art has been given, obtaining slightly improved results. Experimental results demonstrate the effectiveness of the proposed approach.
[ { "created": "Sun, 5 Jan 2014 08:14:43 GMT", "version": "v1" } ]
2014-01-07
[ [ "Aroquiaraj", "I. Laurence", "" ], [ "Thangavel", "K.", "" ] ]
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null
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1401.0872
Philip Schniter
Justin Ziniel, Philip Schniter, and Per Sederberg
Binary Linear Classification and Feature Selection via Generalized Approximate Message Passing
null
null
10.1109/TSP.2015.2407311
null
cs.IT math.IT stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
For the problem of binary linear classification and feature selection, we propose algorithmic approaches to classifier design based on the generalized approximate message passing (GAMP) algorithm, recently proposed in the context of compressive sensing. We are particularly motivated by problems where the number of features greatly exceeds the number of training examples, but where only a few features suffice for accurate classification. We show that sum-product GAMP can be used to (approximately) minimize the classification error rate and max-sum GAMP can be used to minimize a wide variety of regularized loss functions. Furthermore, we describe an expectation-maximization (EM)-based scheme to learn the associated model parameters online, as an alternative to cross-validation, and we show that GAMP's state-evolution framework can be used to accurately predict the misclassification rate. Finally, we present a detailed numerical study to confirm the accuracy, speed, and flexibility afforded by our GAMP-based approaches to binary linear classification and feature selection.
[ { "created": "Sun, 5 Jan 2014 08:23:06 GMT", "version": "v1" }, { "created": "Tue, 26 Aug 2014 10:11:31 GMT", "version": "v2" }, { "created": "Tue, 16 Dec 2014 14:24:42 GMT", "version": "v3" } ]
2015-06-18
[ [ "Ziniel", "Justin", "" ], [ "Schniter", "Philip", "" ], [ "Sederberg", "Per", "" ] ]
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1401.0875
Sonali Goyal
Anoop J. Sahoo, Md. Amir Khusru Akhtar
Determining the Possibilities and Certainties in Network Participation for MANETS
10 Pages. International Journal of Computer Engineering and Applications,2013
null
null
null
cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A mobile ad hoc network is a self organized cooperative network that works without any permanent infrastructure. This infrastructure less design makes it complex compared to other wireless networks. Lot of attacks and misbehavior obstruct the growth and implementation. The majority of attacks and misbehavior can be handled by existing protocols. But these protocols reduce the total strength of nodes in a network because they isolate nodes from network participation having lesser reputation value. To cope with this problem we have presented the Possibility and Certainty model. This model uses reputation value to determine the possibilities and certainties in network participation. The proposed model classifies nodes into three classes such as certain or HIGH grade possible or MED grade and not possible or LOW grade. Choosing HIGH grade nodes in network activities improves the Packet Delivery Ratio which enhances the throughput of the MANET. On the other hand when node strength is poor we choose MED grade nodes for network activities. Thus the proposed model allows communication in the worst scenario with the possibility of success. It protects a network from misbehavior by isolating LOW grade nodes from routing paths.
[ { "created": "Sun, 5 Jan 2014 09:00:40 GMT", "version": "v1" } ]
2014-01-07
[ [ "Sahoo", "Anoop J.", "" ], [ "Akhtar", "Md. Amir Khusru", "" ] ]
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1401.0877
Unnikrishnan K G
K.G. Unnikrishnan and B. Sundar Rajan
Space-Time Coded Spatial Modulated Physical Layer Network Coding for Two-Way Relaying
9 pages, 7 figures
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Using the spatial modulation approach, where only one transmit antenna is active at a time, we propose two transmission schemes for two-way relay channel using physical layer network coding with space time coding using Coordinate Interleaved Orthogonal Designs (CIOD's). It is shown that using two uncorrelated transmit antennas at the nodes, but using only one RF transmit chain and space-time coding across these antennas can give a better performance without using any extra resources and without increasing the hardware implementation cost and complexity. In the first transmission scheme, two antennas are used only at the relay, Adaptive Network Coding (ANC) is employed at the relay and the relay transmits a CIOD Space Time Block Code (STBC). This gives a better performance compared to an existing ANC scheme for two-way relay channel which uses one antenna each at all the three nodes. It is shown that for this scheme at high SNR the average end-to-end symbol error probability (SEP) is upper bounded by twice the SEP of a point-to-point fading channel. In the second transmission scheme, two transmit antennas are used at all the three nodes, CIOD STBC's are transmitted in multiple access and broadcast phases. This scheme provides a diversity order of two for the average end-to-end SEP with an increased decoding complexity of $\mathcal{O}(M^3)$ for an arbitrary signal set and $\mathcal{O}(M^2\sqrt{M})$ for square QAM signal set.
[ { "created": "Sun, 5 Jan 2014 09:28:42 GMT", "version": "v1" } ]
2014-01-07
[ [ "Unnikrishnan", "K. G.", "" ], [ "Rajan", "B. Sundar", "" ] ]
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1401.0879
Nicolas Piro
Nicolas Piro, Thomas Pengo, Nicolas Olivier, Suliana Manley
Improved 3D Superresolution Localization Microscopy Using Adaptive Optics
9 pages, 3 figures
null
null
null
physics.optics physics.bio-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We demonstrate a new versatile method for 3D super-resolution microscopy by using a deformable mirror to shape the point spread function of our microscope in a continuous and controllable way. We apply this for 3D STORM imaging of microtubules.
[ { "created": "Sun, 5 Jan 2014 09:45:19 GMT", "version": "v1" } ]
2014-01-07
[ [ "Piro", "Nicolas", "" ], [ "Pengo", "Thomas", "" ], [ "Olivier", "Nicolas", "" ], [ "Manley", "Suliana", "" ] ]
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1401.0880
Nick Gravin
Ning Chen and Nick Gravin and Pinyan Lu
Optimal Competitive Auctions
null
null
null
null
cs.GT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the design of truthful auctions for selling identical items in unlimited supply (e.g., digital goods) to n unit demand buyers. This classic problem stands out from profit-maximizing auction design literature as it requires no probabilistic assumptions on buyers' valuations and employs the framework of competitive analysis. Our objective is to optimize the worst-case performance of an auction, measured by the ratio between a given benchmark and revenue generated by the auction. We establish a sufficient and necessary condition that characterizes competitive ratios for all monotone benchmarks. The characterization identifies the worst-case distribution of instances and reveals intrinsic relations between competitive ratios and benchmarks in the competitive analysis. With the characterization at hand, we show optimal competitive auctions for two natural benchmarks. The most well-studied benchmark $\mathcal{F}^{(2)}(\cdot)$ measures the envy-free optimal revenue where at least two buyers win. Goldberg et al. [13] showed a sequence of lower bounds on the competitive ratio for each number of buyers n. They conjectured that all these bounds are tight. We show that optimal competitive auctions match these bounds. Thus, we confirm the conjecture and settle a central open problem in the design of digital goods auctions. As one more application we examine another economically meaningful benchmark, which measures the optimal revenue across all limited-supply Vickrey auctions. We identify the optimal competitive ratios to be $(\frac{n}{n-1})^{n-1}-1$ for each number of buyers n, that is $e-1$ as $n$ approaches infinity.
[ { "created": "Sun, 5 Jan 2014 09:59:07 GMT", "version": "v1" } ]
2014-01-07
[ [ "Chen", "Ning", "" ], [ "Gravin", "Nick", "" ], [ "Lu", "Pinyan", "" ] ]
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1401.0882
Jesse Alama
Jesse Alama
Exploring Steinitz-Rademacher polyhedra: A challenge for automated reasoning tools
5 pages. Presented at IWIL 2010 (International Workshop on the Implementation of Logics), Yogyakarta, Indonesia
Proceedings of the Eighth International Workshop on the Implementation of Logics, 2010, pp. 14-18
null
null
math.LO cs.DM cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This note reports on some experiments, using a handful of standard automated reasoning tools, for exploring Steinitz-Rademacher polyhedra, which are models of a certain first-order theory of incidence structures. This theory and its models, even simple ones, presents significant, geometrically fascinating challenges for automated reasoning tools.
[ { "created": "Sun, 5 Jan 2014 10:29:49 GMT", "version": "v1" }, { "created": "Wed, 8 Jan 2014 14:48:36 GMT", "version": "v2" } ]
2014-01-09
[ [ "Alama", "Jesse", "" ] ]
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null
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1401.0885
Stefano Berardi
Stefano Berardi (University of Turin), Ugo de'Liguoro (University of Turin)
Knowledge Spaces and the Completeness of Learning Strategies
null
Logical Methods in Computer Science, Volume 10, Issue 1 (February 12, 2014) lmcs:729
10.2168/LMCS-10(1:9)2014
null
cs.LO math.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose a theory of learning aimed to formalize some ideas underlying Coquand's game semantics and Krivine's realizability of classical logic. We introduce a notion of knowledge state together with a new topology, capturing finite positive and negative information that guides a learning strategy. We use a leading example to illustrate how non-constructive proofs lead to continuous and effective learning strategies over knowledge spaces, and prove that our learning semantics is sound and complete w.r.t. classical truth, as it is the case for Coquand's and Krivine's approaches.
[ { "created": "Sun, 5 Jan 2014 11:04:02 GMT", "version": "v1" }, { "created": "Tue, 11 Feb 2014 16:10:01 GMT", "version": "v2" } ]
2015-07-01
[ [ "Berardi", "Stefano", "", "University of Turin" ], [ "de'Liguoro", "Ugo", "", "University of\n Turin" ] ]
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1401.0886
Najashi Bara'u Gafai
Barau Gafai Najashi, Feng Wenjiang, Mohammed Dikko Almustapha
Spectrum Hole Prediction Based On Historical Data: A Neural Network Approach
8 pages,9 figures
null
null
null
cs.NE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The concept of cognitive radio pioneered by Mitola promises to change the future of wireless communication especially in the area of spectrum management. Currently, the command and control strategy employed in spectrum assignment is too rigid and needs to be reviewed. Recent studies have shown that assigned spectrum is underutilized spectrally and temporally. Cognitive radio provides a viable solution whereby licensed users can share the spectrum with unlicensed users opportunistically without causing interference. Unlicensed users must be able to sense weather the channel is busy or idle, failure to do so will lead to interference to the licensed user. In this paper, a neural network based prediction model for predicting the channel status using historical data obtained during a spectrum occupancy measurement is presented. Genetic algorithm is combined with LM BP for increasing the probability of obtaining the best weights thus optimizing the network. The results obtained indicate high prediction accuracy over all bands considered
[ { "created": "Sun, 5 Jan 2014 11:41:43 GMT", "version": "v1" } ]
2014-01-07
[ [ "Najashi", "Barau Gafai", "" ], [ "Wenjiang", "Feng", "" ], [ "Almustapha", "Mohammed Dikko", "" ] ]
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1401.0887
Dorina Thanou
Dorina Thanou, David I Shuman, Pascal Frossard
Learning parametric dictionaries for graph signals
null
null
10.1109/TSP.2014.2332441
null
cs.LG cs.SI stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In sparse signal representation, the choice of a dictionary often involves a tradeoff between two desirable properties -- the ability to adapt to specific signal data and a fast implementation of the dictionary. To sparsely represent signals residing on weighted graphs, an additional design challenge is to incorporate the intrinsic geometric structure of the irregular data domain into the atoms of the dictionary. In this work, we propose a parametric dictionary learning algorithm to design data-adapted, structured dictionaries that sparsely represent graph signals. In particular, we model graph signals as combinations of overlapping local patterns. We impose the constraint that each dictionary is a concatenation of subdictionaries, with each subdictionary being a polynomial of the graph Laplacian matrix, representing a single pattern translated to different areas of the graph. The learning algorithm adapts the patterns to a training set of graph signals. Experimental results on both synthetic and real datasets demonstrate that the dictionaries learned by the proposed algorithm are competitive with and often better than unstructured dictionaries learned by state-of-the-art numerical learning algorithms in terms of sparse approximation of graph signals. In contrast to the unstructured dictionaries, however, the dictionaries learned by the proposed algorithm feature localized atoms and can be implemented in a computationally efficient manner in signal processing tasks such as compression, denoising, and classification.
[ { "created": "Sun, 5 Jan 2014 12:17:51 GMT", "version": "v1" } ]
2015-06-18
[ [ "Thanou", "Dorina", "" ], [ "Shuman", "David I", "" ], [ "Frossard", "Pascal", "" ] ]
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1401.0889
Yue Guo
Yue Guo, Xuelian Shen, Zhanfeng Zhu
Research on the mobile robots intelligent path planning based on ant colony algorithm application in manufacturing logistics
17 pages,7 figures
null
null
null
cs.RO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
With the development of robotics and artificial intelligence field unceasingly thorough, path planning as an important field of robot calculation has been widespread concern. This paper analyzes the current development of robot and path planning algorithm and focuses on the advantages and disadvantages of the traditional intelligent path planning as well as the path planning. The problem of mobile robot path planning is studied by using ant colony algorithm, and it also provides some solving methods.
[ { "created": "Sun, 5 Jan 2014 13:21:59 GMT", "version": "v1" }, { "created": "Tue, 7 Jan 2014 12:44:35 GMT", "version": "v2" } ]
2014-01-08
[ [ "Guo", "Yue", "" ], [ "Shen", "Xuelian", "" ], [ "Zhu", "Zhanfeng", "" ] ]
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1401.0892
Nir Weinberger
Nir Weinberger and Neri Merhav
Optimum Trade-offs Between the Error Exponent and the Excess-Rate Exponent of Variable-Rate Slepian-Wolf Coding
Extended version of paper submitted to the IEEE Trans. on Information Theory. Presented in part in ISIT2014
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cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We analyze the optimal trade-off between the error exponent and the excess-rate exponent for variable-rate Slepian-Wolf codes. In particular, we first derive upper (converse) bounds on the optimal error and excess-rate exponents, and then lower (achievable) bounds, via a simple class of variable-rate codes which assign the same rate to all source blocks of the same type class. Then, using the exponent bounds, we derive bounds on the optimal rate functions, namely, the minimal rate assigned to each type class, needed in order to achieve a given target error exponent. The resulting excess-rate exponent is then evaluated. Iterative algorithms are provided for the computation of both bounds on the optimal rate functions and their excess-rate exponents. The resulting Slepian-Wolf codes bridge between the two extremes of fixed-rate coding, which has minimal error exponent and maximal excess-rate exponent, and average-rate coding, which has maximal error exponent and minimal excess-rate exponent.
[ { "created": "Sun, 5 Jan 2014 14:03:37 GMT", "version": "v1" }, { "created": "Wed, 5 Nov 2014 19:27:42 GMT", "version": "v2" }, { "created": "Thu, 6 Nov 2014 17:44:10 GMT", "version": "v3" } ]
2014-11-07
[ [ "Weinberger", "Nir", "" ], [ "Merhav", "Neri", "" ] ]
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1401.0898
Vijendra Singh
Vijendra Singh and Shivani Pathak
Feature Selection Using Classifier in High Dimensional Data
null
null
null
null
cs.CV cs.LG stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Feature selection is frequently used as a pre-processing step to machine learning. It is a process of choosing a subset of original features so that the feature space is optimally reduced according to a certain evaluation criterion. The central objective of this paper is to reduce the dimension of the data by finding a small set of important features which can give good classification performance. We have applied filter and wrapper approach with different classifiers QDA and LDA respectively. A widely-used filter method is used for bioinformatics data i.e. a univariate criterion separately on each feature, assuming that there is no interaction between features and then applied Sequential Feature Selection method. Experimental results show that filter approach gives better performance in respect of Misclassification Error Rate.
[ { "created": "Sun, 5 Jan 2014 14:52:27 GMT", "version": "v1" } ]
2014-01-07
[ [ "Singh", "Vijendra", "" ], [ "Pathak", "Shivani", "" ] ]
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1401.0903
Emmanuel Bacry
Emmanuel Bacry and Jean-Francois Muzy
Second order statistics characterization of Hawkes processes and non-parametric estimation
25 pages, 14 figures
null
null
null
stat.ME math.ST physics.geo-ph q-fin.ST q-fin.TR stat.TH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We show that the jumps correlation matrix of a multivariate Hawkes process is related to the Hawkes kernel matrix through a system of Wiener-Hopf integral equations. A Wiener-Hopf argument allows one to prove that this system (in which the kernel matrix is the unknown) possesses a unique causal solution and consequently that the second-order properties fully characterize a Hawkes process. The numerical inversion of this system of integral equations allows us to propose a fast and efficient method, which main principles were initially sketched in [Bacry and Muzy, 2013], to perform a non-parametric estimation of the Hawkes kernel matrix. In this paper, we perform a systematic study of this non-parametric estimation procedure in the general framework of marked Hawkes processes. We describe precisely this procedure step by step. We discuss the estimation error and explain how the values for the main parameters should be chosen. Various numerical examples are given in order to illustrate the broad possibilities of this estimation procedure ranging from 1-dimensional (power-law or non positive kernels) up to 3-dimensional (circular dependence) processes. A comparison to other non-parametric estimation procedures is made. Applications to high frequency trading events in financial markets and to earthquakes occurrence dynamics are finally considered.
[ { "created": "Sun, 5 Jan 2014 15:28:07 GMT", "version": "v1" }, { "created": "Fri, 13 Feb 2015 08:33:23 GMT", "version": "v2" } ]
2015-02-16
[ [ "Bacry", "Emmanuel", "" ], [ "Muzy", "Jean-Francois", "" ] ]
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1401.0906
Paul Clarke
P. Clarke
A Search Procedure for Cyclic Subsets
10 pages, 2 figures
null
null
null
cs.DS math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, a polynomial time algorithm for finding the set of all cyclic subsets in a graph is presented. The concept of cyclic subsets has already been introduced in an earlier paper. The algorithm finds cyclic subsets in a graph G by conjoining building block subsets of length three in V(G). We prove the correctness of this algorithm and present an asymptotic time complexity analysis of the algorithm's performance.
[ { "created": "Sun, 5 Jan 2014 16:20:34 GMT", "version": "v1" } ]
2014-01-07
[ [ "Clarke", "P.", "" ] ]
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1401.0912
Ronald de Wolf
Urmila Mahadev (UC Berkeley) and Ronald de Wolf (CWI and University of Amsterdam)
Rational approximations and quantum algorithms with postselection
v2: 12 pages LaTeX, to appear in Quantum Information and Computation. Compared to version 1, the writing has been improved but the results are unchanged
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quant-ph cs.CC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the close connection between rational functions that approximate a given Boolean function, and quantum algorithms that compute the same function using postselection. We show that the minimal degree of the former equals (up to a factor of 2) the minimal query complexity of the latter. We give optimal (up to constant factors) quantum algorithms with postselection for the Majority function, slightly improving upon an earlier algorithm of Aaronson. Finally we show how Newman's classic theorem about low-degree rational approximation of the absolute-value function follows from these algorithms.
[ { "created": "Sun, 5 Jan 2014 16:43:11 GMT", "version": "v1" }, { "created": "Sat, 23 Aug 2014 11:52:10 GMT", "version": "v2" } ]
2014-08-26
[ [ "Mahadev", "Urmila", "", "UC Berkeley" ], [ "de Wolf", "Ronald", "", "CWI and University of\n Amsterdam" ] ]
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1401.0918
Katarzyna Sznajd-Weron
Katarzyna Sznajd-Weron and Karol Michal Suszczynski
Nonlinear q-voter model with deadlocks on the Watts-Strogatz graph
null
null
10.1088/1742-5468/2014/07/P07018
null
physics.soc-ph cs.SI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the nonlinear $q$-voter model with deadlocks on a Watts-Strogats graph. Using Monte Carlo simulations, we obtain so called exit probability and exit time. We determine how network properties, such as randomness or density of links influence exit properties of a model.
[ { "created": "Sun, 5 Jan 2014 17:52:34 GMT", "version": "v1" } ]
2015-06-18
[ [ "Sznajd-Weron", "Katarzyna", "" ], [ "Suszczynski", "Karol Michal", "" ] ]
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1401.0920
Jason Kaye
Jason Kaye, Lin Lin, Chao Yang
A posteriori error estimator for adaptive local basis functions to solve Kohn-Sham density functional theory
34 pages, 12 figures
Commun. Math. Sci. 13, 7 (2015)
10.4310/CMS.2015.v13.n7.a5
null
math.NA physics.chem-ph physics.comp-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Kohn-Sham density functional theory is one of the most widely used electronic structure theories. The recently developed adaptive local basis functions form an accurate and systematically improvable basis set for solving Kohn-Sham density functional theory using discontinuous Galerkin methods, requiring a small number of basis functions per atom. In this paper we develop residual-based a posteriori error estimates for the adaptive local basis approach, which can be used to guide non-uniform basis refinement for highly inhomogeneous systems such as surfaces and large molecules. The adaptive local basis functions are non-polynomial basis functions, and standard a posteriori error estimates for $hp$-refinement using polynomial basis functions do not directly apply. We generalize the error estimates for $hp$-refinement to non-polynomial basis functions. We demonstrate the practical use of the a posteriori error estimator in performing three-dimensional Kohn-Sham density functional theory calculations for quasi-2D aluminum surfaces and a single-layer graphene oxide system in water.
[ { "created": "Sun, 5 Jan 2014 18:02:40 GMT", "version": "v1" }, { "created": "Mon, 16 Jun 2014 23:07:20 GMT", "version": "v2" } ]
2021-08-03
[ [ "Kaye", "Jason", "" ], [ "Lin", "Lin", "" ], [ "Yang", "Chao", "" ] ]
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1401.0921
Jochen Burghardt
Jochen Burghardt
Maintaining partial sums in logarithmic time
8 pages, 3 figues. Full version of an article in the "Nordic Journal of Computing", including Hoare-style correctness proofs of algorithms
Nordic Journal of Computing, Vol.8, No.4, p.473-474, 2001
null
null
cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a data structure that allows to maintain in logarithmic time all partial sums of elements of a linear array during incremental changes of element's values.
[ { "created": "Sun, 5 Jan 2014 18:04:34 GMT", "version": "v1" } ]
2014-01-07
[ [ "Burghardt", "Jochen", "" ] ]
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1401.0922
Amir Akhavan
Azam Majooni, Mona Masood, Amir Akhavan
A survey on the importance of visualization and social collaboration in academic digital libraries
14 pages, 5 figures
null
null
null
cs.DL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
From more than half a century ago indexing scientific articles has been studied intensively to provide a more efficient data retrieval and to conserve researchers invaluable time. In the last two decades with the emergence of the World Wide Web and the rapid growth in the number of scientific documents online many academic databases and search engines were launched with almost similar structure in order to reduce the difficulty in finding, relating and sorting of the existing scientific documents published online. The dramatic increase of the scientific documents in the last few years makes it necessary that the retrieved information by the search engines be analyzed and more organized and interpretable representation be displayed to the users. Information visualization is a great way for exploration of large and complex data sets, therefore it can be a natural candidate for the purpose of generating more comprehensible search results for the citation and academic databases. In this survey the usage pattern of the participants and their demands and ideas for the existence of other beneficial methods for literature review has been questioned and the results are quantitatively analyzed.
[ { "created": "Sun, 5 Jan 2014 18:22:49 GMT", "version": "v1" } ]
2014-01-07
[ [ "Majooni", "Azam", "" ], [ "Masood", "Mona", "" ], [ "Akhavan", "Amir", "" ] ]
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1401.0924
Yanne Chembo
Aur\'elien Coillet, John Dudley, Goery Genty, Laurent Larger, and Yanne K. Chembo
Optical Rogue Waves in Whispering-Gallery-Mode Resonators
null
null
10.1103/PhysRevA.89.013835
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We report a theoretical study showing that rogue waves can emerge in whispering gallery mode resonators as the result of the chaotic interplay between Kerr nonlinearity and anomalous group-velocity dispersion. The nonlinear dynamics of the propagation of light in a whispering gallery-mode resonator is investigated using the Lugiato-Lefever equation, and we evidence a range of parameters where rare and extreme events associated with a non-gaussian statistics of the field maxima are observed.
[ { "created": "Sun, 5 Jan 2014 18:41:11 GMT", "version": "v1" } ]
2015-06-18
[ [ "Coillet", "Aurélien", "" ], [ "Dudley", "John", "" ], [ "Genty", "Goery", "" ], [ "Larger", "Laurent", "" ], [ "Chembo", "Yanne K.", "" ] ]
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1401.0926
Shinkyu Park
Shinkyu Park and Nuno C. Martins
A Class of LTI Distributed Observers for LTI Plants: Necessary and Sufficient Conditions for Stabilizability
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cs.SY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Consider that an autonomous linear time-invariant (LTI) plant is given and that a network of LTI observers assesses its output vector. The dissemination of information within the network is dictated by a pre-specified directed graph in which each vertex represents an observer. Each observer computes its own state estimate using only the portion of the output vector accessible to it and the state estimates of other observers that are transmitted to it by its neighbors, according to the graph. This paper proposes an update rule that is a natural generalization of consensus, and for which we determine necessary and sufficient conditions for the existence of parameters for the update rule that lead to asymptotic omniscience of the state of the plant at all observers. The conditions reduce to certain detectability requirements that imply that if omniscience is not possible under the proposed scheme then it is not viable under any other scheme that is subject to the same communication graph, including nonlinear and time-varying ones.
[ { "created": "Sun, 5 Jan 2014 18:46:04 GMT", "version": "v1" } ]
2014-01-07
[ [ "Park", "Shinkyu", "" ], [ "Martins", "Nuno C.", "" ] ]
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1401.0927
Yanne Chembo
Aur\'elien Coillet and Yanne K. Chembo
Routes to spatiotemporal chaos in Kerr optical frequency combs
null
null
10.1063/1.4863298
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We investigate the various routes to spatiotemporal chaos in Kerr optical frequency combs obtained through pumping an ultra-high quality whispering-gallery mode resonator with a continuous-wave laser. The Lugiato-Lefever model is used to build bifurcation diagrams with regards to the parameters that are externally controllable, namely, the frequency and the power of the pumping laser. We show that the spatiotemporal chaos emerging from Turing patterns and solitons display distinctive dynamical features. Experimental spectra of chaotic Kerr combs are also presented for both cases, in excellent agreement with theoretical spectra.
[ { "created": "Sun, 5 Jan 2014 18:52:30 GMT", "version": "v1" } ]
2015-06-18
[ [ "Coillet", "Aurélien", "" ], [ "Chembo", "Yanne K.", "" ] ]
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1401.0930
Yanne Chembo
Aur\'elien Coillet and Yanne K. Chembo
On phase-locking of Kerr combs
null
null
null
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We theoretically investigate the phase-locking phenomena between the spectral components of Kerr optical frequency combs in the dynamical regime of Turing patterns. We show that these Turing patterns display a particularly strong and robust phase-locking, originating from a cascade of phase-locked triplets which asymptotically lead to a global phase-locking between the modes. The local and global phase-locking relationship defining the shape of the optical pulses are analytically determined. Our analysis also shows that solitons display a much weaker phase-locking which can be destroyed more easily than in the Turing pattern regime. Our results indicate that Turing patterns are generally the most suitable for applications requiring the highest stability. Experimental generation of such combs is also discussed in detail, in excellent agreement with the numerical simulations.
[ { "created": "Sun, 5 Jan 2014 19:19:14 GMT", "version": "v1" } ]
2014-01-07
[ [ "Coillet", "Aurélien", "" ], [ "Chembo", "Yanne K.", "" ] ]
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1401.0936
Djamal Belazzougui
Djamal Belazzougui
Linear time construction of compressed text indices in compact space
Expanded version of a paper appeared in proceedings of STOC 2014 conference
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cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We show that the compressed suffix array and the compressed suffix tree for a string of length $n$ over an integer alphabet of size $\sigma\leq n$ can both be built in $O(n)$ (randomized) time using only $O(n\log\sigma)$ bits of working space. The previously fastest construction algorithms that used $O(n\log\sigma)$ bits of space took times $O(n\log\log\sigma)$ and $O(n\log^{\epsilon}n)$ respectively (where $\epsilon$ is any positive constant smaller than $1$). In the passing, we show that the Burrows-Wheeler transform of a string of length $n$ over an alphabet of size $\sigma$ can be built in deterministic $O(n)$ time and space $O(n\log\sigma)$. We also show that within the same time and space, we can carry many sequence analysis tasks and construct some variants of the compressed suffix array and compressed suffix tree.
[ { "created": "Sun, 5 Jan 2014 20:26:13 GMT", "version": "v1" }, { "created": "Fri, 14 Aug 2015 13:56:14 GMT", "version": "v2" }, { "created": "Mon, 23 May 2016 13:54:58 GMT", "version": "v3" } ]
2016-05-24
[ [ "Belazzougui", "Djamal", "" ] ]
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1401.0943
Adeyinka Akanbi MR
Adeyinka K Akanbi
LB2CO: A Semantic Ontology Framework for B2C eCommerce Transaction on the Internet
9 Pages, 7 figures, Research Paper
International Journal of Research in Computer Science, 4 (1): pp. 1-9, January 2014
10.7815/ijorcs.41.2014.075
null
cs.CY cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Business ontology can enhance the successful development of complex enterprise system; this is being achieved through knowledge sharing and the ease of communication between every entity in the domain. Through human semantic interaction with the web resources, machines to interpret the data published in a machine interpretable form under web. However, the theoretical practice of business ontology in eCommerce domain is quite a few especially in the section of electronic transaction, and the various techniques used to obtain efficient communication across spheres are error prone and are not always guaranteed to be efficient in obtaining desired result due to poor semantic integration between entities. To overcome the poor semantic integration this research focuses on proposed ontology called LB2CO, which combines the framework of IDEF5 & SNAP as an analysis tool, for automated recommendation of product and services and create effective ontological framework for B2C transaction & communication across different business domains that facilitates the interoperability & integration of B2C transactions over the web.
[ { "created": "Sun, 5 Jan 2014 21:31:26 GMT", "version": "v1" } ]
2014-01-13
[ [ "Akanbi", "Adeyinka K", "" ] ]
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1401.0949
Amin Chabchoub AC
R. Peric, N. Hoffmann, A. Chabchoub
Initial Wave Breaking Dynamics of Peregrine-Type Rogue Waves: A Numerical and Experimental Study
null
null
10.1016/j.euromechflu.2014.07.002
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Peregrine breather, today widely regarded as a prototype for spatio-temporally localized rogue waves on the ocean caused by nonlinear focusing, is analyzed by direct numerical simulations based on two-phase Navier-Stokes equations. A finite-volume approach with a volume of fluid method is applied to study the Peregrine breather dynamics up to the initial stages of wave breaking. The comparison of the numerical results with laboratory experiments to validate the numerical approach shows very good agreement and suggests that the chosen method is an effective tool to study modulation instability and breather dynamics in water waves with high accuracy even up to the onset of wave breaking. The numerical results also indicate some previously unnoticed characteristics of the flow fields below the water surface of breathers, which might be of significance for short-term prediction of rogue waves. Recurrent wave breaking is also observed.
[ { "created": "Sun, 5 Jan 2014 22:31:59 GMT", "version": "v1" } ]
2015-06-18
[ [ "Peric", "R.", "" ], [ "Hoffmann", "N.", "" ], [ "Chabchoub", "A.", "" ] ]
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1401.0951
Enys Mones
Enys Mones, Andr\'as Czir\'ok and Tam\'as Vicsek
Anomalous segregation dynamics of self-propelled particles
null
New J. Phys. 17 (2015) 063013
10.1088/1367-2630/17/6/063013
null
cond-mat.soft cond-mat.stat-mech nlin.AO physics.bio-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A number of novel experimental and theoretical results have recently been obtained on active soft matter, demonstrating the various interesting universal and anomalous features of this kind of driven systems. Here we consider a fundamental but still unexplored aspect of the patterns arising in the system of actively moving units, i.e., their segregation taking place when two kinds of them with different adhesive properties are present. The process of segregation is studied by a model made of self-propelled particles such that the particles have a tendency to adhere only to those which are of the same kind. The calculations corresponding to the related differential equations can be made in parallel, thus a powerful GPU card allows large scale simulations. We find that the segregation kinetics is very different from the non-driven counterparts and is described by the new scaling exponents $z\simeq 1$ and $z\simeq 0.8$ for the 1:1 and the non-equal ratio of the two constituents, respectively. Our results are in agreement with a recent observation of segregating tissue cells \emph{in vitro}.
[ { "created": "Sun, 5 Jan 2014 22:48:07 GMT", "version": "v1" }, { "created": "Sat, 11 Jan 2014 10:46:09 GMT", "version": "v2" }, { "created": "Tue, 17 Jun 2014 11:23:14 GMT", "version": "v3" } ]
2015-06-12
[ [ "Mones", "Enys", "" ], [ "Czirók", "András", "" ], [ "Vicsek", "Tamás", "" ] ]
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1401.0953
Pierre-Francois Loos Dr
Pierre-Fran\c{c}ois Loos and Caleb J. Ball and Peter M. W. Gill
Uniform Electron Gases. II. The Generalized Local Density Approximation in One Dimension
26 pages, 2 figures, accepted for publication in Journal of Chemical Physics
null
10.1063/1.4867910
null
physics.chem-ph cond-mat.other cond-mat.str-el
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We introduce a generalization (gLDA) of the traditional Local Density Approximation (LDA) within density functional theory. The gLDA uses both the one-electron Seitz radius $\rs$ and a two-electron hole curvature parameter $\eta$ at each point in space. The gLDA reduces to the LDA when applied to the infinite homogeneous electron gas but, unlike the LDA, is is also exact for finite uniform electron gases on spheres. We present an explicit gLDA functional for the correlation energy of electrons that are confined to a one-dimensional space and compare its accuracy with LDA, second- and third-order M{\o}ller-Plesset perturbation energies and exact calculations for a variety of inhomogeneous systems.
[ { "created": "Sun, 5 Jan 2014 23:06:42 GMT", "version": "v1" }, { "created": "Wed, 26 Feb 2014 09:00:54 GMT", "version": "v2" } ]
2015-06-18
[ [ "Loos", "Pierre-François", "" ], [ "Ball", "Caleb J.", "" ], [ "Gill", "Peter M. W.", "" ] ]
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1401.0958
Wei Chen Ms
Wei Chen, Aashish A. Clerk
Photon propagation in a one-dimensional optomechanical lattice
14 pages, 10 figures
Phys. Rev. A 89, 033854 (2014)
10.1103/PhysRevA.89.033854
null
cond-mat.mes-hall physics.optics quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider a one-dimensional optomechanical lattice where each site is strongly driven by a control laser to enhance the basic optomechanical interaction. We then study the propagation of photons injected by an additional probe laser beam; this is the lattice-generalization of the well-known optomechanically-induced transparency (OMIT) effect in a single optomechanical cavity. We find an interesting interplay between OMIT-type physics and geometric, Fabry-Perot type resonances. In particular, phonon-like polaritons can give rise to high-amplitude transmission resonances which are much narrower than the scale set by internal photon losses. We also find that the local photon density of states in the lattice exhibits OMIT-style interference features. It is thus far richer than would be expected by just looking at the band structure of the dissipation-free coherent system.
[ { "created": "Mon, 6 Jan 2014 00:05:21 GMT", "version": "v1" }, { "created": "Fri, 10 Jan 2014 15:48:39 GMT", "version": "v2" }, { "created": "Fri, 28 Mar 2014 19:22:48 GMT", "version": "v3" } ]
2014-04-02
[ [ "Chen", "Wei", "" ], [ "Clerk", "Aashish A.", "" ] ]
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1401.0962
Jake Stinson
Jake Stinson, Shawn Kathmann and Ian Ford
Investigating the significance of zero-point motion in small molecular clusters of sulphuric acid and water
7 pages, 7 figures. Manuscript is the final pre-publication form which was accepted by the journal of chemical physics on the 19th of December 2013. Copyright 2013 J. Stinson, S. Kathmann and I. Ford. This article is distributed under a Creative Commons Attribution 3.0 Unported License
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10.1063/1.4803255
null
physics.chem-ph
http://creativecommons.org/licenses/by/3.0/
The nucleation of particles from trace gases in the atmosphere is an important source of cloud condensation nuclei (CCN), and these are vital for the formation of clouds in view of the high supersaturations required for homogeneous water droplet nucleation. The methods of quantum chemistry have increasingly been employed to model nucleation due to their high accuracy and efficiency in calculating configurational energies; and nucleation rates can be obtained from the associated free energies of particle formation. However, even in such advanced approaches, it is typically assumed that the nuclei have a classical nature, which is questionable for some systems. The importance of zero-point motion (also known as quantum nuclear dynamics) in modelling small clusters of sulphuric acid and water is tested here using the path integral molecular dynamics (PIMD) method at the density functional theory (DFT) level of theory. The general effect of zero-point motion is to distort the mean structure slightly, and to promote the extent of proton transfer with respect to classical behaviour. In a particular configuration of one sulphuric acid molecule with three waters, the range of positions explored by a proton between a sulphuric acid and a water molecule at 300 K (a broad range in contrast to the confinement suggested by geometry optimisation at 0 K) is clearly affected by the inclusion of zero point motion, and similar effects are observed for other configurations.
[ { "created": "Mon, 6 Jan 2014 00:58:46 GMT", "version": "v1" } ]
2014-04-28
[ [ "Stinson", "Jake", "" ], [ "Kathmann", "Shawn", "" ], [ "Ford", "Ian", "" ] ]
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1401.0963
Vladimir Garcia-Morales
Vladimir Garcia-Morales
Quantum Mechanics and the Principle of Least Radix Economy
39 pages, 2 figures. Final version. Accepted to Foundations of Physics (Springer)
Found. Phys. 45, 295 (2015)
10.1007/s10701-015-9865-x
null
physics.gen-ph quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A new variational method, the principle of least radix economy, is formulated. The mathematical and physical relevance of the radix economy, also called digit capacity, is established, showing how physical laws can be derived from this concept in a unified way. The principle reinterprets and generalizes the principle of least action yielding two classes of physical solutions: least action paths and quantum wavefunctions. A new physical foundation of the Hilbert space of quantum mechanics is then accomplished and it is used to derive the Schr\"odinger and Dirac equations and the breaking of the commutativity of spacetime geometry. The formulation provides an explanation of how determinism and random statistical behavior coexist in spacetime and a framework is developed that allows dynamical processes to be formulated in terms of chains of digits. These methods lead to a new (pre-geometrical) foundation for Lorentz transformations and special relativity. The Parker-Rhodes combinatorial hierarchy is encompassed within our approach and this leads to an estimate of the interaction strength of the electromagnetic and gravitational forces that agrees with the experimental values to an error of less than one thousandth. Finally, it is shown how the principle of least-radix economy naturally gives rise to Boltzmann's principle of classical statistical thermodynamics. A new expression for a general (path-dependent) nonequilibrium entropy is proposed satisfying the Second Law of Thermodynamics.
[ { "created": "Mon, 6 Jan 2014 01:07:56 GMT", "version": "v1" }, { "created": "Thu, 9 Jan 2014 14:56:37 GMT", "version": "v2" }, { "created": "Tue, 4 Feb 2014 13:53:29 GMT", "version": "v3" }, { "created": "Wed, 15 Oct 2014 13:03:15 GMT", "version": "v4" }, { "created": "Thu, 8 Jan 2015 17:04:22 GMT", "version": "v5" } ]
2015-02-20
[ [ "Garcia-Morales", "Vladimir", "" ] ]
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1401.0968
EPTCS
Rodrigo Casta\~no (Departamento de Computaci\'on. FCEyN. UBA), Juan Pablo Galeotti (Saarland University), Diego Garbervetsky (Departamento de Computaci\'on. FCEyN. UBA), Jonathan Tapicer (Departamento de Computaci\'on. FCEyN. UBA), Edgardo Zoppi (Departamento de Computaci\'on. FCEyN. UBA)
On Verifying Resource Contracts using Code Contracts
In Proceedings LAFM 2013, arXiv:1401.0564
EPTCS 139, 2014, pp. 1-15
10.4204/EPTCS.139.1
null
cs.SE cs.PL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we present an approach to check resource consumption contracts using an off-the-shelf static analyzer. We propose a set of annotations to support resource usage specifications, in particular, dynamic memory consumption constraints. Since dynamic memory may be recycled by a memory manager, the consumption of this resource is not monotone. The specification language can express both memory consumption and lifetime properties in a modular fashion. We develop a proof-of-concept implementation by extending Code Contracts' specification language. To verify the correctness of these annotations we rely on the Code Contracts static verifier and a points-to analysis. We also briefly discuss possible extensions of our approach to deal with non-linear expressions.
[ { "created": "Mon, 6 Jan 2014 02:31:56 GMT", "version": "v1" } ]
2014-01-07
[ [ "Castaño", "Rodrigo", "", "Departamento de Computación. FCEyN. UBA" ], [ "Galeotti", "Juan Pablo", "", "Saarland University" ], [ "Garbervetsky", "Diego", "", "Departamento de\n Computación. FCEyN. UBA" ], [ "Tapicer", "Jonathan", "", "Departamento de Computación.\n FCEyN. UBA" ], [ "Zoppi", "Edgardo", "", "Departamento de Computación. FCEyN. UBA" ] ]
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1401.0969
EPTCS
Pablo F. Castro (Universidad Nacional de Rio Cuarto - CONICET), Thomas S. E. Maibaum (McMaster University)
Automated Reasoning over Deontic Action Logics with Finite Vocabularies
In Proceedings LAFM 2013, arXiv:1401.0564
EPTCS 139, 2014, pp. 16-30
10.4204/EPTCS.139.2
null
cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we investigate further the tableaux system for a deontic action logic we presented in previous work. This tableaux system uses atoms (of a given boolean algebra of action terms) as labels of formulae, this allows us to embrace parallel execution of actions and action complement, two action operators that may present difficulties in their treatment. One of the restrictions of this logic is that it uses vocabularies with a finite number of actions. In this article we prove that this restriction does not affect the coherence of the deduction system; in other words, we prove that the system is complete with respect to language extension. We also study the computational complexity of this extended deductive framework and we prove that the complexity of this system is in PSPACE, which is an improvement with respect to related systems.
[ { "created": "Mon, 6 Jan 2014 02:32:12 GMT", "version": "v1" } ]
2014-01-07
[ [ "Castro", "Pablo F.", "", "Universidad Nacional de Rio Cuarto - CONICET" ], [ "Maibaum", "Thomas S. E.", "", "McMaster University" ] ]
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1401.0970
EPTCS
Valentin Cassano (McMaster University), Thomas S. E. Maibaum (McMaster University)
Actions and Events in Concurrent Systems Design
In Proceedings LAFM 2013, arXiv:1401.0564
EPTCS 139, 2014, pp. 31-45
10.4204/EPTCS.139.3
null
cs.SE cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this work, having in mind the construction of concurrent systems from components, we discuss the difference between actions and events. For this discussion, we propose an(other) architecture description language in which actions and events are made explicit in the description of a component and a system. Our work builds from the ideas set forth by the categorical approach to the construction of software based systems from components advocated by Goguen and Burstall, in the context of institutions, and by Fiadeiro and Maibaum, in the context of temporal logic. In this context, we formalize a notion of a component as an element of an indexed category and we elicit a notion of a morphism between components as morphisms of this category. Moreover, we elaborate on how this formalization captures, in a convenient manner, the underlying structure of a component and the basic interaction mechanisms for putting components together. Further, we advance some ideas on how certain matters related to the openness and the compositionality of a component/system may be described in terms of classes of morphisms, thus potentially supporting a compositional rely/guarantee reasoning.
[ { "created": "Mon, 6 Jan 2014 02:32:22 GMT", "version": "v1" } ]
2014-01-07
[ [ "Cassano", "Valentin", "", "McMaster University" ], [ "Maibaum", "Thomas S. E.", "", "McMaster\n University" ] ]
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1401.0971
EPTCS
Germ\'an Regis (UNRC - Argentina), Fernando Villar (UNRC - Argentina), Nicol\'as Ricci (UNRC - Argentina)
Fluent Logic Workflow Analyser: A Tool for The Verification of Workflow Properties
In Proceedings LAFM 2013, arXiv:1401.0564
EPTCS 139, 2014, pp. 46-52
10.4204/EPTCS.139.4
null
cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we present the design and implementation, as well as a use case, of a tool for workflow analysis. The tool provides an assistant for the specification of properties of a workflow model. The specification language for property description is Fluent Linear Time Temporal Logic. Fluents provide an adequate flexibility for capturing properties of workflows. Both the model and the properties are encoded, in an automated way, as Labelled Transition Systems, and the analysis is reduced to model checking.
[ { "created": "Mon, 6 Jan 2014 02:32:32 GMT", "version": "v1" } ]
2014-01-07
[ [ "Regis", "Germán", "", "UNRC - Argentina" ], [ "Villar", "Fernando", "", "UNRC - Argentina" ], [ "Ricci", "Nicolás", "", "UNRC - Argentina" ] ]
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1401.0972
EPTCS
Val\'erio Medeiros Jr. (Federal Institute of Education, Science and Technology of Rio Grande do Norte), David D\'eharbe (Federal University of Rio Grande do Norte)
BEval: A Plug-in to Extend Atelier B with Current Verification Technologies
In Proceedings LAFM 2013, arXiv:1401.0564
EPTCS 139, 2014, pp. 53-58
10.4204/EPTCS.139.5
null
cs.SE cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper presents BEval, an extension of Atelier B to improve automation in the verification activities in the B method or Event-B. It combines a tool for managing and verifying software projects (Atelier B) and a model checker/animator (ProB) so that the verification conditions generated in the former are evaluated with the latter. In our experiments, the two main verification strategies (manual and automatic) showed significant improvement as ProB's evaluator proves complementary to Atelier B built-in provers. We conducted experiments with the B model of a micro-controller instruction set; several verification conditions, that we were not able to discharge automatically or manually with AtelierB's provers, were automatically verified using BEval.
[ { "created": "Mon, 6 Jan 2014 02:32:40 GMT", "version": "v1" } ]
2014-01-07
[ [ "Medeiros", "Valério", "Jr.", "Federal Institute of Education, Science and\n Technology of Rio Grande do Norte" ], [ "Déharbe", "David", "", "Federal University of\n Rio Grande do Norte" ] ]
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1401.0973
EPTCS
Pablo Bendersky (Departamento de Computaci\'on, FCEyN, UBA Buenos Aires, Argentina), Juan Pablo Galeotti (Saarland University Saarbr\"ucken, Germany), Diego Garbervetsky (Departamento de Computaci\'on, FCEyN, UBA Buenos Aires, Argentina)
The DynAlloy Visualizer
In Proceedings LAFM 2013, arXiv:1401.0564
EPTCS 139, 2014, pp. 59-64
10.4204/EPTCS.139.6
null
cs.SE cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present an extension to the DynAlloy tool to navigate DynAlloy counterexamples: the DynAlloy Visualizer. The user interface mimics the functionality of a programming language debugger. Without this tool, a DynAlloy user is forced to deal with the internals of the Alloy intermediate representation in order to debug a flaw in her model.
[ { "created": "Mon, 6 Jan 2014 02:32:51 GMT", "version": "v1" } ]
2014-01-07
[ [ "Bendersky", "Pablo", "", "Departamento de Computación, FCEyN, UBA Buenos\n Aires, Argentina" ], [ "Galeotti", "Juan Pablo", "", "Saarland University Saarbrücken,\n Germany" ], [ "Garbervetsky", "Diego", "", "Departamento de Computación, FCEyN, UBA\n Buenos Aires, Argentina" ] ]
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1401.0974
EPTCS
Manuel Gim\'enez (DC - FCEN - UBA), Mariano M. Moscato (DC - FCEN - UBA), Carlos G. Lopez Pombo (DC - FCEN - UBA), Marcelo F. Frias (ITBA - CONICET)
HeteroGenius: A Framework for Hybrid Analysis of Heterogeneous Software Specifications
In Proceedings LAFM 2013, arXiv:1401.0564
EPTCS 139, 2014, pp. 65-70
10.4204/EPTCS.139.7
null
cs.SE cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Nowadays, software artifacts are ubiquitous in our lives being an essential part of home appliances, cars, cell phones, and even in more critical activities like aeronautics and health sciences. In this context software failures may produce enormous losses, either economical or, in the worst case, in human lives. Software analysis is an area in software engineering concerned with the application of diverse techniques in order to prove the absence of errors in software pieces. In many cases different analysis techniques are applied by following specific methodological combinations that ensure better results. These interactions between tools are usually carried out at the user level and it is not supported by the tools. In this work we present HeteroGenius, a framework conceived to develop tools that allow users to perform hybrid analysis of heterogeneous software specifications. HeteroGenius was designed prioritising the possibility of adding new specification languages and analysis tools and enabling a synergic relation of the techniques under a graphical interface satisfying several well-known usability enhancement criteria. As a case-study we implemented the functionality of Dynamite on top of HeteroGenius.
[ { "created": "Mon, 6 Jan 2014 02:33:02 GMT", "version": "v1" } ]
2014-01-07
[ [ "Giménez", "Manuel", "", "DC - FCEN - UBA" ], [ "Moscato", "Mariano M.", "", "DC - FCEN -\n UBA" ], [ "Pombo", "Carlos G. Lopez", "", "DC - FCEN - UBA" ], [ "Frias", "Marcelo F.", "", "ITBA -\n CONICET" ] ]
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1401.0975
EPTCS
Gast\'on Scilingo (UNRC - Argentina), Mar\'ia Marta Novaira (UNRC - Argentina), Renzo Degiovanni (CONICET, UNRC - Argentina)
Analyzing Behavioural Scenarios over Tabular Specifications Using Model Checking
In Proceedings LAFM 2013, arXiv:1401.0564
EPTCS 139, 2014, pp. 71-76
10.4204/EPTCS.139.8
null
cs.SE cs.SY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Tabular notations, in particular SCR specifications, have proved to be a useful means for formally describing complex requirements. The SCR method offers a powerful family of analysis tools, known as the SCR Toolset, but its availability is restricted by the Naval Research Laboratory of the USA. This toolset applies different kinds of analysis considering the whole set of behaviours associated with a requirements specification. In this paper we present a tool for describing and analyzing SCR requirements descriptions, that complements the SCR Toolset in two aspects. First, its use is not limited by any institution, and resorts to a standard model checking tool for analysis; and second, it allows to concentrate the analysis to particular sets of behaviours (subsets of the whole specifications), that correspond to particular scenarios explicitly mentioned in the specification. We take an operational notation that allows the engineer to describe behavioural "scenarios" by means of programs, and provide a translation into Promela to perform the analysis via Spin, an efficient off-the-shelf model checker freely available. In addition, we apply the SCR method to a Pacemaker system and we use its tabular specification as a running example of this article.
[ { "created": "Mon, 6 Jan 2014 02:33:12 GMT", "version": "v1" } ]
2014-01-07
[ [ "Scilingo", "Gastón", "", "UNRC - Argentina" ], [ "Novaira", "María Marta", "", "UNRC -\n Argentina" ], [ "Degiovanni", "Renzo", "", "CONICET, UNRC - Argentina" ] ]
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1401.0976
Nitin Saxena
Nitin Saxena
Progress on Polynomial Identity Testing - II
17 pages, 1 figure, survey
null
null
null
cs.CC cs.DM math.AC math.AG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We survey the area of algebraic complexity theory; with the focus being on the problem of polynomial identity testing (PIT). We discuss the key ideas that have gone into the results of the last few years.
[ { "created": "Mon, 6 Jan 2014 03:18:06 GMT", "version": "v1" } ]
2014-01-07
[ [ "Saxena", "Nitin", "" ] ]
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1401.0978
Virgil Griffith
Virgil Griffith
A Principled Infotheoretic \phi-like Measure
18 pages; 6 figures
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Integrated information theory is a mathematical, quantifiable theory of conscious experience. The linchpin of this theory, the $\phi$ measure, quantifies a system's irreducibility to disjoint parts. Purely as a measure of irreducibility, we pinpoint three concerns about $\phi$ and propose a revised measure, $\psi$, which addresses them. Our measure $\psi$ is rigorously grounded in Partial Information Decomposition and is faster to compute than $\phi$.
[ { "created": "Mon, 6 Jan 2014 03:37:19 GMT", "version": "v1" }, { "created": "Tue, 6 May 2014 21:57:27 GMT", "version": "v2" }, { "created": "Thu, 9 Oct 2014 01:13:56 GMT", "version": "v3" } ]
2014-10-10
[ [ "Griffith", "Virgil", "" ] ]
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1401.0981
Yuichiro Manabe
Yuichiro Manabe, Issei Nakamura and Masako Bando
Reaction Rate Theory of Radiation Exposure and Scaling Hypothesis in Mutation Frequency
12 pages, 3 figures
null
10.7566/JPSJ.83.114003
null
physics.bio-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We develop a kinetic reaction model for cells having irradiated DNA molecules due to ionizing radiation exposure. Our theory simultaneously accounts for the time-dependent reactions of the DNA damage, the DNA mutation, the DNA repair, and the proliferation and apoptosis of cells in a tissue with a minimal set of model parameters. In contrast to existing theories for radiation exposition, we do not assume the relationships between the total dose and the induced mutation frequency. Our theory provides a universal scaling function that reasonably explains the mega-mouse experiments in Ref.[W. L. Russell and E. M. Kelly, Proc. Natl. Acad. Sci. USA. {\bf 79} (1982) 542.] with different dose rates. Furthermore, we have estimated the effective dose rate, which is biologically equivalent to the ionizing effects other than those caused by artificial irradiation. This value is $ 1.11 \times 10^{-3} ~\rm{[Gy/hr]}$, which is significantly larger than the effect caused by natural background radiation.
[ { "created": "Mon, 6 Jan 2014 04:20:05 GMT", "version": "v1" }, { "created": "Tue, 10 Jun 2014 05:21:55 GMT", "version": "v2" } ]
2015-06-18
[ [ "Manabe", "Yuichiro", "" ], [ "Nakamura", "Issei", "" ], [ "Bando", "Masako", "" ] ]
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1401.0983
Atsushi Horikoshi
Atsushi Horikoshi
External Source Method for Kubo-Transformed Quantum Correlation Functions
8 pages, 1 figure
International Journal of Quantum Chemistry, Vol.113, No.3, pp.326-329 (2013)
null
null
quant-ph cond-mat.stat-mech physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We revisit the external source method for Kubo-transformed quantum correlation functions recently proposed by Krishna and Voth. We derive an exact formula and show that the Krishna-Voth formula can be derived as an approximation of our formula. Some properties of this approximation are clarified through a model calculation of the position autocorrelation function for a one-dimensional harmonic oscillator. A key observation is that the Krishna-Voth correlation function has a term which behaves as the secular term in perturbation theory.
[ { "created": "Mon, 6 Jan 2014 04:42:34 GMT", "version": "v1" } ]
2014-01-08
[ [ "Horikoshi", "Atsushi", "" ] ]
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