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1402.6034
Renato J Cintra
R. J. Cintra and F. M. Bayer
A DCT Approximation for Image Compression
10 pages, 6 figures
IEEE Signal Processing Letters, 18(10):579-582, October 2011
10.1109/LSP.2011.2163394
null
cs.MM cs.CV stat.ME
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
An orthogonal approximation for the 8-point discrete cosine transform (DCT) is introduced. The proposed transformation matrix contains only zeros and ones; multiplications and bit-shift operations are absent. Close spectral behavior relative to the DCT was adopted as design criterion. The proposed algorithm is superior to the signed discrete cosine transform. It could also outperform state-of-the-art algorithms in low and high image compression scenarios, exhibiting at the same time a comparable computational complexity.
[ { "created": "Tue, 25 Feb 2014 02:49:01 GMT", "version": "v1" } ]
2014-02-26
[ [ "Cintra", "R. J.", "" ], [ "Bayer", "F. M.", "" ] ]
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1402.6044
Masoud Abbaszadeh
Masoud Abbaszadeh
Generalized Nonlinear Robust Energy-to-Peak Filtering for Differential Algebraic Systems
16 pages, 2 figures. arXiv admin note: substantial text overlap with arXiv:1402.5511
null
null
null
cs.SY math.OC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The problem of robust nonlinear energy-to-peak filtering for nonlinear descriptor systems with model uncertainties is addressed. The system is assumed to have nonlinearities both in the state and output equations as well as norm-bounded time-varying uncertainties in the realization matrices. A generalized nonlinear dynamic filtering structure is proposed for such a class of systems with more degrees of freedom than the conventional static-gain and dynamic filtering structures. The L2-Linfty filter is synthesized through semidefinite programming and strict LMIs, in which the energy-to-peak filtering performance in optimized.
[ { "created": "Tue, 25 Feb 2014 03:42:31 GMT", "version": "v1" } ]
2014-02-26
[ [ "Abbaszadeh", "Masoud", "" ] ]
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1402.6045
Ashraf Shahin
Ashraf A. Shahin
Multi-Dimensional Customization Modelling Based On Metagraph For Saas Multi-Tenant Applications
10 pages, 8 figures
null
null
null
cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Software as a Service (SaaS) is a new software delivery model in which pre-built applications are delivered to customers as a service. SaaS providers aim to attract a large number of tenants (users) with minimal system modifications to meet economics of scale. To achieve this aim, SaaS applications have to be customizable to meet requirements of each tenant. However, due to the rapid growing of the SaaS, SaaS applications could have thousands of tenants with a huge number of ways to customize applications. Modularizing such customizations still is a highly complex task. Additionally, due to the big variation of requirements for tenants, no single customization model is appropriate for all tenants. In this paper, we propose a multi-dimensional customization model based on metagraph. The proposed mode addresses the modelling variability among tenants, describes customizations and their relationships, and guarantees the correctness of SaaS customizations made by tenants.
[ { "created": "Tue, 25 Feb 2014 03:44:09 GMT", "version": "v1" } ]
2014-02-26
[ [ "Shahin", "Ashraf A.", "" ] ]
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1402.6046
Hoa Khanh Dam
Hoa Khanh Dam and Aditya Ghose
Towards rational and minimal change propagation in model evolution
null
null
null
null
cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A critical issue in the evolution of software models is change propagation: given a primary change that is made to a model in order to meet a new or changed requirement, what additional secondary changes are needed to maintain consistency within the model, and between the model and other models in the system? In practice, there are many ways of propagating changes to fix a given inconsistency, and how to justify and automate the selection between such change options remains a critical challenge. In this paper, we propose a number of postulates, inspired by the mature belief revision theory, that a change propagation process should satisfy to be considered rational and minimal. Such postulates enable us to reason about selecting alternative change options, and consequently to develop a machinery that automatically performs this task. We further argue that a possible implementation of such a change propagation process can be considered as a classical state space search in which each state represents a snapshot of the model in the process. This view naturally reflects the cascading nature of change propagation, where each change can require further changes to be made.
[ { "created": "Tue, 25 Feb 2014 03:59:47 GMT", "version": "v1" } ]
2014-02-26
[ [ "Dam", "Hoa Khanh", "" ], [ "Ghose", "Aditya", "" ] ]
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1402.6047
Md Nurujjaman Ph D
M. Nurujjaman and A. N. Sekar Iyengar
Canard-induced mixed mode oscillations in an excitable glow discharge plasmas
6 pages
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null
null
nlin.CD physics.data-an physics.plasm-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We demonstrated experimentally canard induced mixed mode oscillations (MMO) in an excitable glow discharge plasma, and the results are validated through numerical solution of the FitzHugh Nagumo (FHN) model. When glow discharge plasma is perturbed by applying a magnetic field, it shows mixed mode oscillatory activity, i.e., quasiperiodic small oscillations interposed with large bounded limit cycles oscillations. The initial quasiperiodic oscillations were observed to change into large amplitude limit cycle oscillations with magnetic field, and the number of these oscillation increases with increase in the magnetic field. Fourier analysis of both numerical and experimental results show that the origin of these oscillations are canard-induced phenomena, which occurs near the threshold of the control parameter. Further, the phase space plots also confirm that the oscillations are basically canard-induced MMOs.
[ { "created": "Tue, 25 Feb 2014 04:00:08 GMT", "version": "v1" } ]
2014-02-26
[ [ "Nurujjaman", "M.", "" ], [ "Iyengar", "A. N. Sekar", "" ] ]
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1402.6050
Saurabh Ariyan
Saurabh Kumar Ariyan, Eshant Bagela, Akanksha Priyadarshin
Abiot: A Low cost agile sonic pest control tricopter
4 pages; workshop paper
null
null
null
cs.RO
http://creativecommons.org/licenses/by-nc-sa/3.0/
In this paper we introduce the concept of an agile electronic pest control intelligent device for commercial usage and we have evaluated its performance in comparison with other existing similar technologies. The frequency and intensities are changed with respect to the target pest however human behavior has been found to be inert with their exposure. The unit has been tested in lab conditions as well as field testing done have given encouraging results. The device can be a standalone unit and hence work for small scale viz. kitchen garden on the other hand multiple devices acting in coordination with each other give the desired output on a larger scale.
[ { "created": "Tue, 25 Feb 2014 04:27:53 GMT", "version": "v1" } ]
2014-02-26
[ [ "Ariyan", "Saurabh Kumar", "" ], [ "Bagela", "Eshant", "" ], [ "Priyadarshin", "Akanksha", "" ] ]
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1402.6058
Yang Jiao
Yang Jiao, Timothy Lau, Haralampos Hatzikirou, Michael Meyer-Hermann, Joseph C. Corbo, Salvatore Torquato
Avian photoreceptor patterns represent a disordered hyperuniform solution to a multiscale packing problem
31 pages, 12 figures
Phys. Rev. E 89, 022721 (2014)
10.1103/PhysRevE.89.022721
null
cond-mat.stat-mech cond-mat.soft physics.bio-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Optimal spatial sampling of light rigorously requires that identical photoreceptors be arranged in perfectly regular arrays in two dimensions. Examples of such perfect arrays in nature include the compound eyes of insects and the nearly crystalline photoreceptor patterns of some fish and reptiles. Birds are highly visual animals with five different cone photoreceptor subtypes, yet their photoreceptor patterns are not perfectly regular. By analyzing the chicken cone photoreceptor system consisting of five different cell types using a variety of sensitive microstructural descriptors, we find that the disordered photoreceptor patterns are ``hyperuniform'' (exhibiting vanishing infinite-wavelength density fluctuations), a property that had heretofore been identified in a unique subset of physical systems, but had never been observed in any living organism. Remarkably, the photoreceptor patterns of both the total population and the individual cell types are simultaneously hyperuniform. We term such patterns ``multi-hyperuniform'' because multiple distinct subsets of the overall point pattern are themselves hyperuniform. We have devised a unique multiscale cell packing model in two dimensions that suggests that photoreceptor types interact with both short- and long-ranged repulsive forces and that the resultant competition between the types gives rise to the aforementioned singular spatial features characterizing the system, including multi-hyperuniformity.
[ { "created": "Tue, 25 Feb 2014 05:29:13 GMT", "version": "v1" } ]
2014-02-26
[ [ "Jiao", "Yang", "" ], [ "Lau", "Timothy", "" ], [ "Hatzikirou", "Haralampos", "" ], [ "Meyer-Hermann", "Michael", "" ], [ "Corbo", "Joseph C.", "" ], [ "Torquato", "Salvatore", "" ] ]
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1402.6065
Tsung-Hui Chang
Tsung-Hui Chang and Mingyi Hong and Xiangfeng Wang
Multi-Agent Distributed Optimization via Inexact Consensus ADMM
submitted to IEEE Trans. Signal Processing; Revised April 2014 and August 2014
null
10.1109/TSP.2014.2367458
null
cs.SY math.OC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Multi-agent distributed consensus optimization problems arise in many signal processing applications. Recently, the alternating direction method of multipliers (ADMM) has been used for solving this family of problems. ADMM based distributed optimization method is shown to have faster convergence rate compared with classic methods based on consensus subgradient, but can be computationally expensive, especially for problems with complicated structures or large dimensions. In this paper, we propose low-complexity algorithms that can reduce the overall computational cost of consensus ADMM by an order of magnitude for certain large-scale problems. Central to the proposed algorithms is the use of an inexact step for each ADMM update, which enables the agents to perform cheap computation at each iteration. Our convergence analyses show that the proposed methods converge well under some convexity assumptions. Numerical results show that the proposed algorithms offer considerably lower computational complexity than the standard ADMM based distributed optimization methods.
[ { "created": "Tue, 25 Feb 2014 06:44:49 GMT", "version": "v1" }, { "created": "Thu, 11 Sep 2014 02:55:27 GMT", "version": "v2" } ]
2015-06-18
[ [ "Chang", "Tsung-Hui", "" ], [ "Hong", "Mingyi", "" ], [ "Wang", "Xiangfeng", "" ] ]
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1402.6067
Zhilin Wu
Zhilin Wu
Regular path queries on graphs with data: A rigid approach
25 pages, 2 figures
null
null
null
cs.LO cs.DB cs.FL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Regular path queries (RPQ) is a classical navigational query formalism for graph databases to specify constraints on labeled paths. Recently, RPQs have been extended by Libkin and Vrgo$\rm \check{c}$ to incorporate data value comparisons among different nodes on paths, called regular path queries with data (RDPQ). It has been shown that the evaluation problem of RDPQs is PSPACE-complete and NLOGSPACE-complete in data complexity. On the other hand, the containment problem of RDPQs is in general undecidable. In this paper, we propose a novel approach to extend regular path queries with data value comparisons, called rigid regular path queries with data (RRDPQ). The main ingredient of this approach is an automata model called nondeterministic rigid register automata (NRRA), in which the data value comparisons are \emph{rigid}, in the sense that if the data value in the current position $x$ is compared to a data value in some other position $y$, then by only using the labels (but not data values), the position $y$ can be uniquely determined from $x$. We show that NRRAs are robust in the sense that nondeterministic, deterministic and two-way variant of NRRAs, as well as an extension of regular expressions, are all of the same expressivity. We then argue that the expressive power of RDPQs are reasonable by demonstrating that for every graph database, there is a localized transformation of the graph database so that every RDPQ in the original graph database can be turned into an equivalent RRDPQ over the transformed one. Finally, we investigate the computational properties of RRDPQs and conjunctive RRDPQs (CRRDPQ). In particular, we show that the containment of CRRDPQs (and RRDPQs) can be decided in 2EXPSPACE.
[ { "created": "Tue, 25 Feb 2014 06:54:08 GMT", "version": "v1" } ]
2014-02-26
[ [ "Wu", "Zhilin", "" ] ]
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1402.6072
Thomas I. Banks
CUORE Collaboration, D. R. Artusa, F. T. Avignone III, O. Azzolini, M. Balata, T. I. Banks, G. Bari, J. Beeman, F. Bellini, A. Bersani, M. Biassoni, C. Brofferio, C. Bucci, X. Z. Cai, A. Camacho, L. Canonica, X. G. Cao, S. Capelli, L. Carbone, L. Cardani, M. Carrettoni, N. Casali, D. Chiesa, N. Chott, M. Clemenza, S. Copello, C. Cosmelli, O. Cremonesi, R. J. Creswick, I. Dafinei, A. Dally, V. Datskov, A. De Biasi, M. M. Deninno, S. Di Domizio, M. L. di Vacri, L. Ejzak, D. Q. Fang, H. A. Farach, M. Faverzani, G. Fernandes, E. Ferri, F. Ferroni, E. Fiorini, M. A. Franceschi, S. J. Freedman, B. K. Fujikawa, A. Giachero, L. Gironi, A. Giuliani, J. Goett, P. Gorla, C. Gotti, T. D. Gutierrez, E. E. Haller, K. Han, K. M. Heeger, R. Hennings-Yeomans, H. Z. Huang, R. Kadel, K. Kazkaz, G. Keppel, Yu. G. Kolomensky, Y. L. Li, C. Ligi, X. Liu, Y. G. Ma, C. Maiano, M. Maino, M. Martinez, R. H. Maruyama, Y. Mei, N. Moggi, S. Morganti, T. Napolitano, S. Nisi, C. Nones, E. B. Norman, A. Nucciotti, T. O'Donnell, F. Orio, D. Orlandi, J. L. Ouellet, M. Pallavicini, V. Palmieri, L. Pattavina, M. Pavan, M. Pedretti, G. Pessina, V. Pettinacci, G. Piperno, C. Pira, S. Pirro, E. Previtali, V. Rampazzo, C. Rosenfeld, C. Rusconi, E. Sala, S. Sangiorgio, N. D. Scielzo, M. Sisti, A. R. Smith, L. Taffarello, M. Tenconi, F. Terranova, W. D. Tian, C. Tomei, S. Trentalange, G. Ventura, M. Vignati, B. S. Wang, H. W. Wang, L. Wielgus, J. Wilson, L. A. Winslow, T. Wise, A. Woodcraft, L. Zanotti, C. Zarra, B. X. Zhu, S. Zucchelli
Searching for neutrinoless double-beta decay of $^{130}$Te with CUORE
20 pages, 8 figures. Published in Advances in High Energy Physics, Volume 2015 (2015), Article ID 879871
null
10.1155/2015/879871
null
physics.ins-det nucl-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Neutrinoless double-beta ($0\nu\beta\beta$) decay is a hypothesized lepton-number-violating process that offers the only known means of asserting the possible Majorana nature of neutrino mass. The Cryogenic Underground Observatory for Rare Events (CUORE) is an upcoming experiment designed to search for $0\nu\beta\beta$ decay of $^{130}$Te using an array of 988 TeO$_2$ crystal bolometers operated at 10 mK. The detector will contain 206 kg of $^{130}$Te and have an average energy resolution of 5 keV; the projected $0\nu\beta\beta$ decay half-life sensitivity after five years of live time is $1.6\times 10^{26}$ y at $1\sigma$ ($9.5\times10^{25}$ y at the 90% confidence level), which corresponds to an upper limit on the effective Majorana mass in the range 40--100 meV (50--130 meV). In this paper we review the experimental techniques used in CUORE as well as its current status and anticipated physics reach.
[ { "created": "Tue, 25 Feb 2014 07:28:32 GMT", "version": "v1" }, { "created": "Fri, 13 Feb 2015 20:55:19 GMT", "version": "v2" } ]
2015-02-16
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1402.6075
Ivan Maksymov
Ivan S. Maksymov, Jessica Hutomo, and Mikhail Kostylev
Transverse magneto-optical Kerr effect in subwavelength dielectric gratings
null
null
10.1364/OE.22.008720
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We demonstrate theoretically a large transverse magneto-optical Kerr effect (TMOKE) in subwavelength gratings consisting of alternating magneto-insulating and nonmagnetic dielectric nanostripes. The reflectivity of the grating reaches $96\%$ at the frequencies corresponding to the maximum of the TMOKE response. The combination of a large TMOKE response and high reflectivity is important for applications in $3$D imaging, magneto-optical data storage, and magnonics.
[ { "created": "Tue, 25 Feb 2014 07:50:11 GMT", "version": "v1" } ]
2015-06-18
[ [ "Maksymov", "Ivan S.", "" ], [ "Hutomo", "Jessica", "" ], [ "Kostylev", "Mikhail", "" ] ]
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1402.6076
Sergei Izrailev
Sergei Izrailev and Jeremy M. Stanley
Machine Learning at Scale
Submitted to KDD'14
null
null
null
cs.LG cs.MS stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
It takes skill to build a meaningful predictive model even with the abundance of implementations of modern machine learning algorithms and readily available computing resources. Building a model becomes challenging if hundreds of terabytes of data need to be processed to produce the training data set. In a digital advertising technology setting, we are faced with the need to build thousands of such models that predict user behavior and power advertising campaigns in a 24/7 chaotic real-time production environment. As data scientists, we also have to convince other internal departments critical to implementation success, our management, and our customers that our machine learning system works. In this paper, we present the details of the design and implementation of an automated, robust machine learning platform that impacts billions of advertising impressions monthly. This platform enables us to continuously optimize thousands of campaigns over hundreds of millions of users, on multiple continents, against varying performance objectives.
[ { "created": "Tue, 25 Feb 2014 07:50:50 GMT", "version": "v1" } ]
2014-02-26
[ [ "Izrailev", "Sergei", "" ], [ "Stanley", "Jeremy M.", "" ] ]
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1402.6077
Zhi-Hua Zhou
Wang-Zhou Dai and Zhi-Hua Zhou
Inductive Logic Boosting
19 pages, 2 figures
null
null
null
cs.LG cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Recent years have seen a surge of interest in Probabilistic Logic Programming (PLP) and Statistical Relational Learning (SRL) models that combine logic with probabilities. Structure learning of these systems is an intersection area of Inductive Logic Programming (ILP) and statistical learning (SL). However, ILP cannot deal with probabilities, SL cannot model relational hypothesis. The biggest challenge of integrating these two machine learning frameworks is how to estimate the probability of a logic clause only from the observation of grounded logic atoms. Many current methods models a joint probability by representing clause as graphical model and literals as vertices in it. This model is still too complicate and only can be approximate by pseudo-likelihood. We propose Inductive Logic Boosting framework to transform the relational dataset into a feature-based dataset, induces logic rules by boosting Problog Rule Trees and relaxes the independence constraint of pseudo-likelihood. Experimental evaluation on benchmark datasets demonstrates that the AUC-PR and AUC-ROC value of ILP learned rules are higher than current state-of-the-art SRL methods.
[ { "created": "Tue, 25 Feb 2014 07:53:49 GMT", "version": "v1" } ]
2014-02-26
[ [ "Dai", "Wang-Zhou", "" ], [ "Zhou", "Zhi-Hua", "" ] ]
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1402.6081
Sebastian Liska
Sebastian Liska and Tim Colonius
A parallel fast multipole method for elliptic difference equations
Corrected typos; changed output format
Journal of Computational Physics 278 (2014), 76-91
10.1016/j.jcp.2014.07.048
null
physics.comp-ph cs.NA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A new fast multipole formulation for solving elliptic difference equations on unbounded domains and its parallel implementation are presented. These difference equations can arise directly in the description of physical systems, e.g. crystal structures, or indirectly through the discretization of PDEs. In the analog to solving continuous inhomogeneous differential equations using Green's functions, the proposed method uses the fundamental solution of the discrete operator on an infinite grid, or lattice Green's function. Fast solutions $\mathcal{O}(N)$ are achieved by using a kernel-independent interpolation-based fast multipole method. Unlike other fast multipole algorithms, our approach exploits the regularity of the underlying Cartesian grid and the efficiency of FFTs to reduce the computation time. Our parallel implementation allows communications and computations to be overlapped and requires minimal global synchronization. The accuracy, efficiency, and parallel performance of the method are demonstrated through numerical experiments on the discrete 3D Poisson equation.
[ { "created": "Tue, 25 Feb 2014 08:18:58 GMT", "version": "v1" }, { "created": "Fri, 7 Nov 2014 23:00:32 GMT", "version": "v2" }, { "created": "Wed, 6 Apr 2016 21:10:42 GMT", "version": "v3" } ]
2016-04-08
[ [ "Liska", "Sebastian", "" ], [ "Colonius", "Tim", "" ] ]
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1402.6082
Yehiam Prior
Adi Salomon, Yehiam Prior, Michael Fedoruk, Jochen Feldmann, Radoslaw Kolkowski and Joseph Zyss
Long Range Coupling between Metallic Nanocavities
arXiv admin note: text overlap with arXiv:1303.0492
null
10.1088/2040-8978/16/11/114012
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
When two or more metallic nanoparticles are in close proximity, their plasmonic modes may interact through the near field, leading to additional resonances of the coupled system or to shifts of their resonant frequencies. This process is analogous to atom-hybridization, as had been proposed by Gersten and Nitzan and modeled by Nordlander et al. The coupling between plasmonic modes can be in-phase (symmetric) or out-of-phase (anti-symmetric), reflecting correspondingly, the "bonding" and "anti-bonding" nature of such configurations. Since the incoming light redistributes the charge distribution around the metallic nanoparticles, its polarization features play a major role in the nonlinear optical probing of the energy-level landscape upon hybridization. Thus, controlling the nature of coupling between metallic nanostructures is of a great importance as it enables tuning their spectral responses leading to novel devices which may surpass the diffraction limit.
[ { "created": "Tue, 25 Feb 2014 08:25:31 GMT", "version": "v1" } ]
2015-06-18
[ [ "Salomon", "Adi", "" ], [ "Prior", "Yehiam", "" ], [ "Fedoruk", "Michael", "" ], [ "Feldmann", "Jochen", "" ], [ "Kolkowski", "Radoslaw", "" ], [ "Zyss", "Joseph", "" ] ]
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1402.6083
Dani Korpi
Dani Korpi, Lauri Anttila, Ville Syrj\"al\"a, Mikko Valkama
Widely-Linear Digital Self-Interference Cancellation in Direct-Conversion Full-Duplex Transceiver
IEEE Journal on Selected Areas in Communications, vol. 32, no. 9, pp. 1674-1687, September 2014
null
10.1109/JSAC.2014.2330093
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This article addresses the modeling and cancellation of self-interference in full-duplex direct-conversion radio transceivers, operating under practical imperfect radio frequency (RF) components. Firstly, detailed self-interference signal modeling is carried out, taking into account the most important RF imperfections, namely transmitter power amplifier nonlinear distortion as well as transmitter and receiver IQ mixer amplitude and phase imbalances. The analysis shows that after realistic antenna isolation and RF cancellation, the dominant self-interference waveform at receiver digital baseband can be modeled through a widely-linear transformation of the original transmit data, opposed to classical purely linear models. Such widely-linear self-interference waveform is physically stemming from the transmitter and receiver IQ imaging, and cannot be efficiently suppressed by classical linear digital cancellation. Motivated by this, novel widely-linear digital self-interference cancellation processing is then proposed and formulated, combined with efficient parameter estimation methods. Extensive simulation results demonstrate that the proposed widely-linear cancellation processing clearly outperforms the existing linear solutions, hence enabling the use of practical low-cost RF front-ends utilizing IQ mixing in full-duplex transceivers.
[ { "created": "Tue, 25 Feb 2014 08:27:01 GMT", "version": "v1" }, { "created": "Wed, 26 Feb 2014 07:15:39 GMT", "version": "v2" }, { "created": "Mon, 4 Aug 2014 10:35:42 GMT", "version": "v3" }, { "created": "Mon, 13 Oct 2014 21:01:40 GMT", "version": "v4" } ]
2014-10-15
[ [ "Korpi", "Dani", "" ], [ "Anttila", "Lauri", "" ], [ "Syrjälä", "Ville", "" ], [ "Valkama", "Mikko", "" ] ]
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1402.6094
Stephan Hundertmark
Stephan Hundertmark, Markus Schneider, Dejian Simicic, Gregory Vincent
Experiments to increase the used Energy with the PEGASUS Railgun
6 pages, 11 figures, Submitted to IEEE Transactions on Plasma Science, Special Issue -- Pulsed Power Science & Technology 2014
Pulsed Power Conference (PPC), 2013 19th IEEE , vol., no., pp.1,6, 16-21 June 2013
10.1109/PPC.2013.6627462
null
physics.plasm-ph physics.ins-det
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The French-German Research Institute (ISL) has several railguns installed, the largest of these is the PEGASUS accelerator. It is a 6m long, 4x4 cm2 caliber distributed energy supply (DES) railgun. It has a 10 MJ capacitor bank as energy supply attached to it. In the past, this installation was used to accelerate projectiles with a mass of about 300 g to velocities up to 2500 m/s. In the ongoing investigation, it is attempted to accelerate heavier projectiles to velocities above 2000m/s. For this a new type of projectile including a payload section was developed. In this paper the results of the experiments with payload projectiles using a primary energy between 3.8 MJ and 4.8 MJ are discussed.
[ { "created": "Tue, 25 Feb 2014 08:47:37 GMT", "version": "v1" } ]
2016-02-17
[ [ "Hundertmark", "Stephan", "" ], [ "Schneider", "Markus", "" ], [ "Simicic", "Dejian", "" ], [ "Vincent", "Gregory", "" ] ]
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1402.6096
Rom Aschner
Rom Aschner and Matthew J. Katz
Bounded-Angle Spanning Tree: Modeling Networks with Angular Constraints
null
null
null
null
cs.CG cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We introduce a new structure for a set of points in the plane and an angle $\alpha$, which is similar in flavor to a bounded-degree MST. We name this structure $\alpha$-MST. Let $P$ be a set of points in the plane and let $0 < \alpha \le 2\pi$ be an angle. An $\alpha$-ST of $P$ is a spanning tree of the complete Euclidean graph induced by $P$, with the additional property that for each point $p \in P$, the smallest angle around $p$ containing all the edges adjacent to $p$ is at most $\alpha$. An $\alpha$-MST of $P$ is then an $\alpha$-ST of $P$ of minimum weight. For $\alpha < \pi/3$, an $\alpha$-ST does not always exist, and, for $\alpha \ge \pi/3$, it always exists. In this paper, we study the problem of computing an $\alpha$-MST for several common values of $\alpha$. Motivated by wireless networks, we formulate the problem in terms of directional antennas. With each point $p \in P$, we associate a wedge $W_p$ of angle $\alpha$ and apex $p$. The goal is to assign an orientation and a radius $r_p$ to each wedge $W_p$, such that the resulting graph is connected and its MST is an $\alpha$-MST. (We draw an edge between $p$ and $q$ if $p \in W_q$, $q \in W_p$, and $|pq| \le r_p, r_q$.) Unsurprisingly, the problem of computing an $\alpha$-MST is NP-hard, at least for $\alpha=\pi$ and $\alpha=2\pi/3$. We present constant-factor approximation algorithms for $\alpha = \pi/2, 2\pi/3, \pi$. One of our major results is a surprising theorem for $\alpha = 2\pi/3$, which, besides being interesting from a geometric point of view, has important applications. For example, the theorem guarantees that given any set $P$ of $3n$ points in the plane and any partitioning of the points into $n$ triplets, one can orient the wedges of each triplet {\em independently}, such that the graph induced by $P$ is connected. We apply the theorem to the {\em antenna conversion} problem.
[ { "created": "Tue, 25 Feb 2014 09:00:19 GMT", "version": "v1" } ]
2014-02-26
[ [ "Aschner", "Rom", "" ], [ "Katz", "Matthew J.", "" ] ]
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1402.6109
Sebastian Ordyniak
Eun Jung Kim, Sebastian Ordyniak, Stefan Szeider
The Complexity of Repairing, Adjusting, and Aggregating of Extensions in Abstract Argumentation
null
Proc. TAFA 2013, pp. 158-175, Springer LNCS
null
null
cs.DS cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the computational complexity of problems that arise in abstract argumentation in the context of dynamic argumentation, minimal change, and aggregation. In particular, we consider the following problems where always an argumentation framework F and a small positive integer k are given. - The Repair problem asks whether a given set of arguments can be modified into an extension by at most k elementary changes (i.e., the extension is of distance k from the given set). - The Adjust problem asks whether a given extension can be modified by at most k elementary changes into an extension that contains a specified argument. - The Center problem asks whether, given two extensions of distance k, whether there is a "center" extension that is a distance at most (k-1) from both given extensions. We study these problems in the framework of parameterized complexity, and take the distance k as the parameter. Our results covers several different semantics, including admissible, complete, preferred, semi-stable and stable semantics.
[ { "created": "Tue, 25 Feb 2014 09:45:23 GMT", "version": "v1" } ]
2014-02-26
[ [ "Kim", "Eun Jung", "" ], [ "Ordyniak", "Sebastian", "" ], [ "Szeider", "Stefan", "" ] ]
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1402.6114
Vincenzo Fioriti dr
Vincenzo Fioriti and Marta Chinnici
Node seniority ranking
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physics.soc-ph cs.SI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Recent advances in graph theory suggest that is possible to identify the oldest nodes of a network using only the graph topology. Here we report on applications to heterogeneous real world networks. To this end, and in order to gain new insights, we propose the theoretical framework of the Estrada communicability. We apply it to two technological networks (an underground, the diffusion of a software worm in a LAN) and to a third network representing a cholera outbreak. In spite of errors introduced in the adjacency matrix of their graphs, the identification of the oldest nodes is feasible, within a small margin of error, and extremely simple. Utilizations include the search of the initial disease-spreader (patient zero problem), rumors in social networks, malware in computer networks, triggering events in blackouts, oldest urban sites recognition.
[ { "created": "Tue, 25 Feb 2014 10:08:10 GMT", "version": "v1" } ]
2014-02-26
[ [ "Fioriti", "Vincenzo", "" ], [ "Chinnici", "Marta", "" ] ]
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1402.6120
Anna Twardak
A. Twardak, P. Bilski, B. Marczewska, J.I. Lee, J.L. Kim, W. Gieszczyk, A. Piaskowska, M. Sadel, D. Wr\'obel
Properties of lithium aluminate for application as OSL dosimeter
null
null
10.1016/j.radphyschem.2014.05.046
null
physics.ins-det cond-mat.mtrl-sci
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Several samples of lithium aluminate (LiAlO2) were prepared in an attempt to achieve material, which can be applicable in optically stimulated luminescence (OSL) dosimetry. Both undoped and carbon or copper doped lithium aluminate samples were investigated. The results of preliminary study of theirs reproducibility, sensitivity, dose response characteristic and fading are presented. Applications in mixed field (beta, alpha, neutrons) dosimetry are discussed.
[ { "created": "Tue, 25 Feb 2014 10:37:28 GMT", "version": "v1" } ]
2015-06-18
[ [ "Twardak", "A.", "" ], [ "Bilski", "P.", "" ], [ "Marczewska", "B.", "" ], [ "Lee", "J. I.", "" ], [ "Kim", "J. L.", "" ], [ "Gieszczyk", "W.", "" ], [ "Piaskowska", "A.", "" ], [ "Sadel", "M.", "" ], [ "Wróbel", "D.", "" ] ]
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1402.6122
Anna Twardak
A. Twardak, P. Bilski, B. Marczewska, W. Gieszczyk
Analysis of TL and OSL kinetics of lithium aluminate
null
null
null
null
physics.ins-det cond-mat.mtrl-sci
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Lithium aluminate (LiAlO2) polycrystalline material showing high OSL sensitivity and linear dose response was prepared at IFJ Krakow. The kinetic parameters of OSL and TL processes were evaluated using various experimental techniques: LM-OSL deconvolution, TL glow-curve deconvolution, variable heating rate and isothermal decay. The OSL signal was found to consist of four components, one of them exhibiting a very slow decay. The TL glow-curve possesses two apparent peaks at approximately 85 oC and at 165 oC, which both seem to follow first order kinetics. These peaks seem to have a composite structure and as many as six peaks were found in the glow-curve.
[ { "created": "Tue, 25 Feb 2014 10:42:06 GMT", "version": "v1" } ]
2014-02-26
[ [ "Twardak", "A.", "" ], [ "Bilski", "P.", "" ], [ "Marczewska", "B.", "" ], [ "Gieszczyk", "W.", "" ] ]
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1402.6123
Rudolf Treumann
R. A. Treumann and W. Baumjohann
Plasma wave mediated electron pairing effects
Ready for submission, Journal not yet specified. 10 pages, 2 figures
null
null
null
physics.space-ph physics.plasm-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Pairing of particles, in particular electrons, in high temperature plasma is generally not expected to occur. Here we investigate, based on earlier work, the possibility for electron pairing mediated in the presence of various kinds of plasma waves. We confirm the possibility for pairing in ion- and electron-acoustic waves, pointing out the importance of the former and the expected consequences. While electron-acoustic waves probably do not play any role, ion-acoustic waves may cause formation of heavy electron compounds. Lower hybrid waves also mediate pairing but under different conditions. Buneman modes which evolve from strong currents may cause pairing among trapped electrons constituting a heavy electron component that populates electron holes. All pairing processes are found to generate cold pair populations. They provide a mechanism of electron cooling which can be interpreted as kind of classical condensation, in some cases possibly accompanied by formation of current filaments, weak soft-X-ray emission and superfluidity which might affect reconnection physics.
[ { "created": "Tue, 25 Feb 2014 10:43:04 GMT", "version": "v1" } ]
2014-02-26
[ [ "Treumann", "R. A.", "" ], [ "Baumjohann", "W.", "" ] ]
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1402.6124
Oliver Mason
Naoise Holohan, Douglas Leith and Oliver Mason
Differential Privacy in Metric Spaces: Numerical, Categorical and Functional Data Under the One Roof
18 Pages
null
null
null
cs.DB cs.IT math.IT math.PR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study Differential Privacy in the abstract setting of Probability on metric spaces. Numerical, categorical and functional data can be handled in a uniform manner in this setting. We demonstrate how mechanisms based on data sanitisation and those that rely on adding noise to query responses fit within this framework. We prove that once the sanitisation is differentially private, then so is the query response for any query. We show how to construct sanitisations for high-dimensional databases using simple 1-dimensional mechanisms. We also provide lower bounds on the expected error for differentially private sanitisations in the general metric space setting. Finally, we consider the question of sufficient sets for differential privacy and show that for relaxed differential privacy, any algebra generating the Borel $\sigma$-algebra is a sufficient set for relaxed differential privacy.
[ { "created": "Tue, 25 Feb 2014 10:47:07 GMT", "version": "v1" } ]
2014-02-26
[ [ "Holohan", "Naoise", "" ], [ "Leith", "Douglas", "" ], [ "Mason", "Oliver", "" ] ]
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1402.6125
Anna Twardak
A. Twardak, P. Bilski, Y. Zorenko, V. Gorbenko, O. Sidletskiy
OSL dosimetric properties of cerium doped lutetium orthosilicates
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physics.ins-det cond-mat.mtrl-sci
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper presents selected optically stimulated luminescence properties of Lu2SiO5:Ce single crystalline films grown using Liquid Phase Epitaxy technique. Comparison of continuous wave optically stimulated luminescence decay curves under blue and green light stimulation is shown. The dose response characteristic is found to be linear in the studied range from 100 uGy to 1 Gy. Analyses of the linearly modulated optically stimulated luminescence signal enabled establishing of the photoionization cross sections for blue light (470 nm). Bleachability and thermal stability of CW-OSL signal are discussed, as well as preliminary results of the fading study.
[ { "created": "Tue, 25 Feb 2014 10:47:40 GMT", "version": "v1" } ]
2014-02-26
[ [ "Twardak", "A.", "" ], [ "Bilski", "P.", "" ], [ "Zorenko", "Y.", "" ], [ "Gorbenko", "V.", "" ], [ "Sidletskiy", "O.", "" ] ]
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1402.6132
Wei Zeng
Wei Zeng, An Zeng, Hao Liu, Ming-Sheng Shang and Tao Zhou
Uncovering the information core in recommender systems
14pages, 5 figures
null
null
null
cs.IR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
With the rapid growth of the Internet and overwhelming amount of information that people are confronted with, recommender systems have been developed to effiectively support users' decision-making process in online systems. So far, much attention has been paid to designing new recommendation algorithms and improving existent ones. However, few works considered the different contributions from different users to the performance of a recommender system. Such studies can help us improve the recommendation efficiency by excluding irrelevant users. In this paper, we argue that in each online system there exists a group of core users who carry most of the information for recommendation. With them, the recommender systems can already generate satisfactory recommendation. Our core user extraction method enables the recommender systems to achieve 90% of the accuracy by taking only 20% of the data into account.
[ { "created": "Tue, 25 Feb 2014 11:08:02 GMT", "version": "v1" } ]
2014-02-26
[ [ "Zeng", "Wei", "" ], [ "Zeng", "An", "" ], [ "Liu", "Hao", "" ], [ "Shang", "Ming-Sheng", "" ], [ "Zhou", "Tao", "" ] ]
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1402.6133
Siddhant Sahu
Siddhant Sahu, V. Sugumaran
Bayesian Sample Size Determination of Vibration Signals in Machine Learning Approach to Fault Diagnosis of Roller Bearings
14 pages, 1 table, 6 figures
Intentional Journal of Research in Mechanical Engineering, Volume 1, Issue 1, July-September, 2013, pp. 55-63, IASTER
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stat.ML cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Sample size determination for a data set is an important statistical process for analyzing the data to an optimum level of accuracy and using minimum computational work. The applications of this process are credible in every domain which deals with large data sets and high computational work. This study uses Bayesian analysis for determination of minimum sample size of vibration signals to be considered for fault diagnosis of a bearing using pre-defined parameters such as the inverse standard probability and the acceptable margin of error. Thus an analytical formula for sample size determination is introduced. The fault diagnosis of the bearing is done using a machine learning approach using an entropy-based J48 algorithm. The following method will help researchers involved in fault diagnosis to determine minimum sample size of data for analysis for a good statistical stability and precision.
[ { "created": "Tue, 25 Feb 2014 11:11:28 GMT", "version": "v1" } ]
2014-02-26
[ [ "Sahu", "Siddhant", "" ], [ "Sugumaran", "V.", "" ] ]
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1402.6135
Ivan Vartaniants
P. Skopintsev, A. Singer, J. Bach, L. Muller, B. Beyersdorf, S. Schleitzer, O. Gorobtsov, A. Shabalin, R. Kurta, D. Dzhigaev, O.M. Yefanov, L. Glaser, A. Sakdinawat, Y. Liu, G. Grubel, R. Fromter, H.P. Oepen, J. Viefhaus, and I.A.Vartanyants
Characterization of Spatial Coherence of Synchrotron Radiation with Non-Redundant Arrays of Apertures
15 pages, 6 figures, 2 tables, 42 references
J. Synchrotron Rad. 21 Part 4, pages 722-728. (2014)
10.1107/S1600577514006857
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a method to characterize the spatial coherence of soft X-ray radiation from a single diffraction pattern. The technique is based on scattering from non-redundant arrays (NRA) of slits and records the degree of spatial coherence at several relative separations from one to 15 microns, simultaneously. Using NRAs we measured the transverse coherence of the X-ray beam at the XUV X-ray beamline P04 of the PETRA III synchrotron storage ring as a function of different beam parameters. To verify the results obtained with the NRAs additional Young's double pinhole experiments were conducted and show good agreement.
[ { "created": "Tue, 25 Feb 2014 11:17:05 GMT", "version": "v1" } ]
2014-11-06
[ [ "Skopintsev", "P.", "" ], [ "Singer", "A.", "" ], [ "Bach", "J.", "" ], [ "Muller", "L.", "" ], [ "Beyersdorf", "B.", "" ], [ "Schleitzer", "S.", "" ], [ "Gorobtsov", "O.", "" ], [ "Shabalin", "A.", "" ], [ "Kurta", "R.", "" ], [ "Dzhigaev", "D.", "" ], [ "Yefanov", "O. M.", "" ], [ "Glaser", "L.", "" ], [ "Sakdinawat", "A.", "" ], [ "Liu", "Y.", "" ], [ "Grubel", "G.", "" ], [ "Fromter", "R.", "" ], [ "Oepen", "H. P.", "" ], [ "Viefhaus", "J.", "" ], [ "Vartanyants", "I. A.", "" ] ]
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1402.6136
Athanasios Kehagias
Athanasios Kehagias, Dieter Mitsche, and Pawel Pralat
The Role of Visibility in Pursuit / Evasion Games
null
null
null
null
cs.DM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The cops-and-robber (CR) game has been used in mobile robotics as a discretized model (played on a graph G) of pursuit/evasion problems. The "classic" CR version is a perfect information game: the cops' (pursuer's) location is always known to the robber (evader) and vice versa. Many variants of the classic game can be defined: the robber can be invisible and also the robber can be either adversarial (tries to avoid capture) or drunk (performs a random walk). Furthermore, the cops and robber can reside in either nodes or edges of G. Several of these variants are relevant as models or robotic pursuit / evasion. In this paper, we first define carefully several of the variants mentioned above and related quantities such as the cop number and the capture time. Then we introduce and study the cost of visibility (COV), a quantitative measure of the increase in difficulty (from the cops' point of view) when the robber is invisible. In addition to our theoretical results, we present algorithms which can be used to compute capture times and COV of graphs which are analytically intractable. Finally, we present the results of applying these algorithms to the numerical computation of COV.
[ { "created": "Tue, 25 Feb 2014 11:17:48 GMT", "version": "v1" } ]
2014-02-26
[ [ "Kehagias", "Athanasios", "" ], [ "Mitsche", "Dieter", "" ], [ "Pralat", "Pawel", "" ] ]
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1402.6138
Kiran Garimella
Sanjay Chawla, Kiran Garimella, Aristides Gionis, Dominic Tsang
Discovering the Network Backbone from Traffic Activity Data
Submitted for review
null
null
null
cs.SI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We introduce a new computational problem, the BackboneDiscovery problem, which encapsulates both functional and structural aspects of network analysis. While the topology of a typical road network has been available for a long time (e.g., through maps), it is only recently that fine-granularity functional (activity and usage) information about the network (like source-destination traffic information) is being collected and is readily available. The combination of functional and structural information provides an efficient way to explore and understand usage patterns of networks and aid in design and decision making. We propose efficient algorithms for the BackboneDiscovery problem including a novel use of edge centrality. We observe that for many real world networks, our algorithm produces a backbone with a small subset of the edges that support a large percentage of the network activity.
[ { "created": "Tue, 25 Feb 2014 11:24:59 GMT", "version": "v1" }, { "created": "Wed, 11 Jun 2014 06:39:44 GMT", "version": "v2" }, { "created": "Mon, 17 Aug 2015 05:04:48 GMT", "version": "v3" } ]
2015-08-18
[ [ "Chawla", "Sanjay", "" ], [ "Garimella", "Kiran", "" ], [ "Gionis", "Aristides", "" ], [ "Tsang", "Dominic", "" ] ]
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1402.6139
Ilya Kuprov
Luke J. Edwards, D.V. Savostyanov, Z.T. Welderufael, Donghan Lee, Ilya Kuprov
A quantum mechanical NMR simulation algorithm for protein-scale spin systems
Submitted for publication
Journal of Magnetic Resonance, 243 (2014) 107-113
10.1016/j.jmr.2014.04.002
null
physics.chem-ph quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Nuclear magnetic resonance spectroscopy is one of the few remaining areas of physical chemistry for which polynomially scaling simulation methods have not so far been available. Here, we report such a method and illustrate its performance by simulating common 2D and 3D liquid state NMR experiments (including accurate description of spin relaxation processes) on isotopically enriched human ubiquitin - a protein containing over a thousand nuclear spins forming an irregular polycyclic three-dimensional coupling lattice. The algorithm uses careful tailoring of the density operator space to only include nuclear spin states that are populated to a significant extent. The reduced state space is generated by analyzing spin connectivity and decoherence properties: rapidly relaxing states as well as correlations between topologically remote spins are dropped from the basis set. In the examples provided, the resulting reduction in the quantum mechanical simulation time is by many orders of magnitude.
[ { "created": "Tue, 25 Feb 2014 11:28:06 GMT", "version": "v1" } ]
2014-07-16
[ [ "Edwards", "Luke J.", "" ], [ "Savostyanov", "D. V.", "" ], [ "Welderufael", "Z. T.", "" ], [ "Lee", "Donghan", "" ], [ "Kuprov", "Ilya", "" ] ]
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1402.6143
Yufeng Li
Yu-Feng Li
Overview of the Jiangmen Underground Neutrino Observatory (JUNO)
4 pages, 3 figure, proceedings for PIC 2013, to appear in IJMPCS
null
10.1142/S2010194514603007
null
physics.ins-det hep-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The medium baseline reactor antineutrino experiment, Jiangmen Underground Neutrino Observatory (JUNO), which is being planed to be built at Jiangmen in South China, can determine the neutrino mass hierarchy and improve the precision of three oscillation parameters by one order of magnitude. The sensitivity potential on these measurements is reviewed and design concepts of the central detector are illustrated. Finally, we emphasize on the technical challenges we meet and the corresponding R&D efforts.
[ { "created": "Tue, 25 Feb 2014 12:13:12 GMT", "version": "v1" } ]
2015-06-18
[ [ "Li", "Yu-Feng", "" ] ]
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1402.6148
Nicolas Broutin
Nicolas Broutin, Olivier Devillers and Ross Hemsley
Efficiently navigating a random Delaunay triangulation
null
null
null
null
math.PR cs.CG cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Planar graph navigation is an important problem with significant implications to both point location in geometric data structures and routing in networks. However, whilst a number of algorithms and existence proofs have been proposed, very little analysis is available for the properties of the paths generated and the computational resources required to generate them under a random distribution hypothesis for the input. In this paper we analyse a new deterministic planar navigation algorithm with constant competitiveness which follows vertex adjacencies in the Delaunay triangulation. We call this strategy cone walk. We prove that given $n$ uniform points in a smooth convex domain of unit area, and for any start point $z$ and query point $q$; cone walk applied to $z$ and $q$ will access at most $O(|zq|\sqrt{n} +\log^7 n)$ sites with complexity $O(|zq|\sqrt{n} \log \log n + \log^7 n)$ with probability tending to 1 as $n$ goes to infinity. We additionally show that in this model, cone walk is $(\log ^{3+\xi} n)$-memoryless with high probability for any pair of start and query point in the domain, for any positive $\xi$. We take special care throughout to ensure our bounds are valid even when the query points are arbitrarily close to the border.
[ { "created": "Tue, 25 Feb 2014 12:28:04 GMT", "version": "v1" } ]
2014-02-26
[ [ "Broutin", "Nicolas", "" ], [ "Devillers", "Olivier", "" ], [ "Hemsley", "Ross", "" ] ]
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1402.6153
Daniel Rohrlich
Vladimir Sokolovsky, Daniel Rohrlich and Baruch Horovitz
Trapping neutral atoms in the field of a vortex pinned by a superconducting nano-disc
20 pages, 5 figures
Phys. Rev. A 89, 053422 (2014)
10.1103/PhysRevA.89.053422
null
physics.atom-ph quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Atom chips made of superconducting material can generate magnetic traps with significantly reduced noise. Recently, several designs for superconducting chips have been theoretically analyzed and experimentally tested, for cases with many vortices considered as an average vortex density. Here we show theoretically, for the first time, how the magnetic field of a $\it single$ vortex, pinned by a superconducting nano-disc of radius $\sim$100 nm and combined with an external bias field parallel to the disc surface, yields a closed 3D trap for cold atoms. The size of the trap, and its height above the superconductor surface, are typically tens or hundreds of nanometers. We estimate the average lifetime $\tau$ of $^{87}$Rb (rubidium) atoms (subject to thermal escape and Majorana spin flips) in the range 0.05-1.0 ms. Next, we model the trap in a quantum adiabatic approximation and apply Fermi's rule to estimate the lifetime of $^{87}$Rb atoms in the ground state of this trap. We obtain similar lifetimes $\tau$ as in the semiclassical estimate, in the range 0.05-3.5 ms. We find that $\tau$ depends on the gradient $B_0$ of the vortex's magnetic field according to $\tau \sim(B_0)^{-2/3}$.
[ { "created": "Tue, 25 Feb 2014 12:37:46 GMT", "version": "v1" }, { "created": "Thu, 6 Mar 2014 20:53:22 GMT", "version": "v2" } ]
2014-06-11
[ [ "Sokolovsky", "Vladimir", "" ], [ "Rohrlich", "Daniel", "" ], [ "Horovitz", "Baruch", "" ] ]
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1402.6161
Bo Huang
Bo Huang and Leonid A. Sidorenkov and Rudolf Grimm and Jeremy M. Hutson
Observation of the Second Triatomic Resonance in Efimov's Scenario
5 pages, 2 figures, 1 table, 1 supplemental material
Phys. Rev. Lett. 112, 190401 (2014)
10.1103/PhysRevLett.112.190401
null
cond-mat.quant-gas physics.atom-ph quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We report the observation of a three-body recombination resonance in an ultracold gas of cesium atoms at a very large negative value of the $s$-wave scattering length. The resonance is identified as the second triatomic Efimov resonance, which corresponds to the situation where the first excited Efimov state appears at the threshold of three free atoms. This observation, together with a finite-temperature analysis and the known first resonance, allows the most accurate demonstration to date of the discrete scaling behavior at the heart of Efimov physics. For the system of three identical bosons, we obtain a scaling factor of $21.0(1.3)$, close to the ideal value of $22.7$.
[ { "created": "Tue, 25 Feb 2014 13:32:28 GMT", "version": "v1" }, { "created": "Sun, 27 Apr 2014 01:30:42 GMT", "version": "v2" } ]
2015-06-22
[ [ "Huang", "Bo", "" ], [ "Sidorenkov", "Leonid A.", "" ], [ "Grimm", "Rudolf", "" ], [ "Hutson", "Jeremy M.", "" ] ]
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1402.6165
Paul Sutcliffe
Antti J. Niemi and Paul Sutcliffe
Leapfrogging vortex rings in the Landau-Lifshitz equation
18 pages, 9 figures. Version to appear in Nonlinearity
Nonlinearity 27, 2095 (2014)
10.1088/0951-7715/27/9/2095
DCPT-14/07
cond-mat.mes-hall hep-th nlin.CD physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Vortex rings are ubiquitous in fluids, with smoke rings being a familiar example. The interaction of multiple vortex rings produces complex dynamical behaviour, such as the leapfrogging motion first analysed by Helmholtz more than a century and a half ago. Here we report on numerical investigations of vortex ring dynamics in a different setting from fluids, namely, as solutions of the Landau-Lifshitz equation that models the evolution of the local magnetization in a ferromagnetic medium. We present the results of the first study on the dynamics of interacting magnetic vortex rings and provide a novel link between fluids and magnetism, by showing that a range of phenomena familiar in fluids are reproduced in ferromagnets. This includes the leapfrogging motion of a pair of vortex rings and evidence for the chaotic dynamics of a trio of rings.
[ { "created": "Tue, 25 Feb 2014 13:53:00 GMT", "version": "v1" } ]
2015-06-18
[ [ "Niemi", "Antti J.", "" ], [ "Sutcliffe", "Paul", "" ] ]
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1402.6168
Christopher Graney
Christopher M. Graney
The Inquisition's Semicolon: Punctuation, Translation, and Science in the 1616 Condemnation of the Copernican System
22 pages, 1 table, 3 figures (2 very high resolution). Revised version (v2) includes minor changes based on feedback to v1. These include correction of several typos, two small adjustments to translation, etc
null
null
null
physics.hist-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper presents high-resolution images of the original document of the 24 February 1616 condemnation of the Copernican system, as being "foolish and absurd in philosophy", by a team of consultants for the Roman Inquisition. Secondary sources have disagreed as to the punctuation of the document. The paper includes a brief analysis of the punctuation and the possible effects of that punctuation on meaning. The original document and its punctuation may also have relevance to public perception of science and to science education.
[ { "created": "Tue, 25 Feb 2014 14:01:36 GMT", "version": "v1" }, { "created": "Tue, 4 Mar 2014 14:48:42 GMT", "version": "v2" } ]
2014-03-05
[ [ "Graney", "Christopher M.", "" ] ]
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1402.6172
Antonio Vidiella-Barranco
G.L. De\c{c}ordi and A. Vidiella-Barranco
Dynamics of atom-field entanglement in a bimodal cavity
null
The European Physical Journal D, 65, 587 (2011)
10.1140/epjd/e2011-20450-3
null
quant-ph cond-mat.mes-hall physics.atom-ph physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We investigate some aspects of the dynamics and entanglement of bipartite quantum system (atom-quantized field), coupled to a third ``external" subsystem (quantized field). We make use of the Raman coupled model; a three-level atom in a lambda configuration interacting with two modes of the quantized cavity field. We consider the far off resonance limit, which allows the derivation of an effective Hamiltonian of a two-level atom coupled to the fields. We also make a comparison with the situation in which one of the modes is treated classically rather than prepared in a quantum field (coherent state).
[ { "created": "Tue, 25 Feb 2014 14:05:19 GMT", "version": "v1" } ]
2021-03-30
[ [ "Deçordi", "G. L.", "" ], [ "Vidiella-Barranco", "A.", "" ] ]
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1402.6176
Christian Wagner
M. Brust, O. Aouane, M. Thiebaud, D. Flormann, C. Verdier, L. Kaestner, M. W. Laschke, H. Selmi, A. Benyoussef, T. Podgorski, G. Coupier, C. Misbah, C. Wagner
The plasma protein fibrinogen stabilizes clusters of red blood cells in microcapillary flows
to appear in Scientific Reports
null
null
null
physics.bio-ph cond-mat.soft physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The supply of oxygen and nutrients and the disposal of metabolic waste in the organs depend strongly on how blood, especially red blood cells, flow through the microvascular network. Macromolecular plasma proteins such as fibrinogen cause red blood cells to form large aggregates, called rouleaux, which are usually assumed to be disaggregated in the circulation due to the shear forces present in bulk flow. This leads to the assumption that rouleaux formation is only relevant in the venule network and in arterioles at low shear rates or stasis. Thanks to an excellent agreement between combined experimental and numerical approaches, we show that despite the large shear rates present in microcapillaries, the presence of either fibrinogen or the synthetic polymer dextran leads to an enhanced formation of robust clusters of red blood cells, even at haematocrits as low as 1%. Robust aggregates are shown to exist in microcapillaries even for fibrinogen concentrations within the healthy physiological range. These persistent aggregates should strongly affect cell distribution and blood perfusion in the microvasculature, with putative implications for blood disorders even within apparently asymptomatic subjects.
[ { "created": "Tue, 25 Feb 2014 14:17:50 GMT", "version": "v1" } ]
2014-02-26
[ [ "Brust", "M.", "" ], [ "Aouane", "O.", "" ], [ "Thiebaud", "M.", "" ], [ "Flormann", "D.", "" ], [ "Verdier", "C.", "" ], [ "Kaestner", "L.", "" ], [ "Laschke", "M. W.", "" ], [ "Selmi", "H.", "" ], [ "Benyoussef", "A.", "" ], [ "Podgorski", "T.", "" ], [ "Coupier", "G.", "" ], [ "Misbah", "C.", "" ], [ "Wagner", "C.", "" ] ]
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1402.6180
Gopal Dixit dr.
Gopal Dixit and Robin Santra
Imaging ultrafast electronic motion by x-ray scattering
7 pages, 3 figures, to be publish as ICPEAC 2013 conference proceeding
Journal of Physics: Conference Series 488, 012009 (2014)
10.1088/1742-6596/488/1/012009
null
physics.atom-ph physics.atm-clus physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Time-resolved ultrafast x-ray scattering is an emerging approach to probe the temporally evolving electronic charge distribution in real-space and in real-time. In this contribution, time-resolved ultrafast x-ray scattering from an electronic wave packet is presented. It is shown that the spatial and temporal correlations are imprinted in the scattering patterns, obtained by ultrafast x-ray scattering from an electronic wave packet, which deviate drastically from the notion that the instantaneous electronic density is the key quantity being probed. Furthermore, a detailed analysis of ultrafast x-ray scattering from a sample containing a mixture of non-stationary and stationary electrons along with the role of scattering interference between a non-stationary and several stationary electrons to the total scattering signal is discussed.
[ { "created": "Tue, 25 Feb 2014 14:45:58 GMT", "version": "v1" } ]
2015-06-18
[ [ "Dixit", "Gopal", "" ], [ "Santra", "Robin", "" ] ]
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1402.6186
Laura Valore
Laura Valore (for the Pierre Auger Collaboration)
Atmospheric Aerosol Attenuation Measurements at the Pierre Auger Observatory
4 pages, 8 figures, AtmoHEAD 2013 Conference proceeding
null
null
null
astro-ph.IM hep-ex physics.ins-det
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Fluorescence Detector (FD) of the Pierre Auger Observatory provides a nearly calorimetric measurement of the primary particle energy, since the fluorescence light produced is proportional to the energy dissipated by an Extensive Air Shower (EAS) in the atmosphere. The atmosphere therefore acts as a giant calorimeter, whose properties need to be well known during data taking. Aerosols play a key role in this scenario, since their effect on light transmission is highly variable even on a time scale of one hour, and the corresponding correction to EAS energy can range from a few percent to more than 40%. For this reason, hourly Vertical Aerosol Optical Depth (taer(h)) profiles are provided for each of the four FD stations. Starting from 2004, up to now 9 years of taer(h) profiles have been produced using data from the Central Laser Facility (CLF) and the eXtreme Laser Facility (XLF) of the Pierre Auger Observatory. The two laser facilities, the techniques developed to measure taer(h) profiles using laser data and the results will be discussed.
[ { "created": "Tue, 25 Feb 2014 14:58:09 GMT", "version": "v1" } ]
2019-08-13
[ [ "Valore", "Laura", "", "for the Pierre Auger Collaboration" ] ]
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1402.6187
Mohamed Drissi
Mohamed Drissi
Modelling the spreading of large-scale wildland fires
24 pages, 8 figures, presented in CFM Bordeaux,France(August 2013) and at Large scale wildland fires conference in Missoula, USA(May, 2014)
null
null
null
physics.ao-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The objective of the present study is twofold. First, the last developments and validation results of a hybrid model designed to simulate fire patterns in heterogeneous landscapes are presented. The model combines the features of a stochastic small-world network model with those of a deterministic semi-physical model of the interaction between burning and non-burning cells that strongly depends on local conditions of wind, topography, and vegetation. Radiation and convection from the flaming zone, and radiative heat loss to the ambient are considered in the preheating process of unburned cells. Second, the model is applied to an Australian grassland fire experiment as well as to a real fire that took place in Corsica in 2009. Predictions compare favorably to experiments in terms of rate of spread, area and shape of the burn. Finally, the sensitivity of the model outcomes (here the rate of spread) to six input parameters is studied using a two-level full factorial design.
[ { "created": "Tue, 25 Feb 2014 14:58:29 GMT", "version": "v1" }, { "created": "Fri, 5 Feb 2016 10:23:34 GMT", "version": "v2" } ]
2016-02-08
[ [ "Drissi", "Mohamed", "" ] ]
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1402.6188
Ping Lu
Manoj Thapa, Ping Lu and Chaoqun Liu
DNS Study for the origin of the flow Randomization in Late Boundary Layer Transition
51st AIAA Aerospace Sciences Meeting. arXiv admin note: substantial text overlap with arXiv:1402.5873
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nlin.CD physics.flu-dyn
http://creativecommons.org/licenses/by/3.0/
This paper is devoted to the investigation of the origin and mechanism of randomization in late boundary layer transition over a flat plate without pressure gradient. The flow randomization is a crucial phase before flow transition to the turbulent state. According to existing literatures, the randomization was caused by the big background noises and non-periodic spanwise boundary conditions. It was assumed that the large ring structure is affected by background noises first, and then the change of large ring structure affects the small length scales quickly, which directly leads to randomization and formation of turbulence. However, by careful analysis of our high order DNS results, we believe that the internal instability of multiple ring cycles structure is the main reason. What we observed is that randomization begins when the third cycle overlaps the first and second cycles. A significant asymmetric phenomenon is originated from the second cycle in the middle of both streamwise and spanwise directions. More technically, a visible asymmetric phenomenon in the middle vortex ring cycle starts at time step t=16.25T and x=838.9{\delta}in where the top and bottom level rings are still completely symmetric. The non-symmetric structure of middle level ring affects the small length scale in boundary layer bottom quickly. The randomization phenomenon spreads to top level through ejections. Finally, the whole flow domain becomes randomized. A hypothesis of C- and K-types shift is given as a possible mechanism of flow randomization.
[ { "created": "Tue, 25 Feb 2014 14:59:36 GMT", "version": "v1" } ]
2014-02-26
[ [ "Thapa", "Manoj", "" ], [ "Lu", "Ping", "" ], [ "Liu", "Chaoqun", "" ] ]
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1402.6189
Christina Birdie
N.Kameswara Rao, A.Vagiswari, Christina Birdie
Charles Michie Smith - founder of the Kodaikanal (Solar Physics) Observatory and beginnings of physical astronomy in India
21 pages, 21 figures, historical notes. arXiv admin note: text overlap with arXiv:0906.0144 by other authors
Current Science, 2014, vol.106, no.3,447 - 467
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physics.hist-ph astro-ph.IM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
It has been about 115 years since the establishment of Kodaikanal Observatory as an extension of the original Madras Observatory, which has evolved into the present Indian Institute of Astrophysics at Bangalore. It is also the first mountain observatory in India. Charles Michie Smith was the man who selected the site, established the observatory and directed it for the first 12 years. He was also the man who recruited John Evershed, discoverer of the famous Evershed effect and established Kodaikanal Observatory as a major centre for solar physics. Michie Smith, the person and the establishment of Kodaikanal Observatory are discussed here in the context of the early studies in physical astronomy (observational astrophysics) in India.
[ { "created": "Mon, 24 Feb 2014 05:43:51 GMT", "version": "v1" } ]
2014-02-26
[ [ "Rao", "N. Kameswara", "" ], [ "Vagiswari", "A.", "" ], [ "Birdie", "Christina", "" ] ]
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1402.6190
Andrzej Dudek
Andrzej Dudek, Marek Karpinski, Andrzej Ruci\'nski, and Edyta Szyma\'nska
Approximate Counting of Matchings in $(3,3)$-Hypergraphs
We thank Michael Simkin who pointed out and fixed an error (cf. Lemma 3 and the proof of Claim 7) in an earlier version of this paper
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null
null
math.CO cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We design a fully polynomial time approximation scheme (FPTAS) for counting the number of matchings (packings) in arbitrary 3-uniform hypergraphs of maximum degree three, referred to as $(3,3)$-hypergraphs. It is the first polynomial time approximation scheme for that problem, which includes also, as a special case, the 3D Matching counting problem for 3-partite $(3,3)$-hypergraphs. The proof technique of this paper uses the general correlation decay technique and a new combinatorial analysis of the underlying structures of the intersection graphs. The proof method could be also of independent interest.
[ { "created": "Tue, 25 Feb 2014 15:04:21 GMT", "version": "v1" }, { "created": "Tue, 29 Apr 2014 07:57:48 GMT", "version": "v2" }, { "created": "Wed, 25 Oct 2017 17:30:14 GMT", "version": "v3" } ]
2017-10-26
[ [ "Dudek", "Andrzej", "" ], [ "Karpinski", "Marek", "" ], [ "Ruciński", "Andrzej", "" ], [ "Szymańska", "Edyta", "" ] ]
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1402.6191
Benjamin-Edouard Peigney
Benjamin-Edouard Peigney (DAM/DIF), Olivier Larroche (DAM/DIF), Vladimir Tikhonchuk (CELIA)
Fokker Planck kinetic modeling of suprathermal alpha-particles in a fusion plasma
null
null
10.1016/j.jcp.2014.08.033
null
physics.plasm-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present an ion kinetic model describing the ignition and burn of the deuterium-tritium fuel of inertial fusion targets. The analysis of the underlying physical model enables us to develop efficient numerical methods to simulate the creation, transport and collisional relaxation of fusion reaction products (alpha-particles) at a kinetic level. A two-energy-scale approach leads to a self-consistent modeling of the coupling between suprathermal alpha-particles and the thermal bulk of the imploding plasma. This method provides an accurate numerical treatment of energy deposition and transport processes involving suprathermal particles. The numerical tools presented here are validated against known analytical results. This enables us to investigate the potential role of ion kinetic effects on the physics of ignition and thermonuclear burn in inertial confinement fusion schemes.
[ { "created": "Sat, 22 Feb 2014 20:31:07 GMT", "version": "v1" } ]
2015-06-18
[ [ "Peigney", "Benjamin-Edouard", "", "DAM/DIF" ], [ "Larroche", "Olivier", "", "DAM/DIF" ], [ "Tikhonchuk", "Vladimir", "", "CELIA" ] ]
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1402.6193
Ping Lu
Chaoqun Liu and Ping Lu
DNS Study on Physics of Late Boundary Layer Transition
50th AIAA Aerospace Sciences. arXiv admin note: text overlap with arXiv:1402.5873
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null
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physics.flu-dyn
http://creativecommons.org/licenses/by/3.0/
This paper serves as a review of our recent new DNS study on physics of late boundary layer transition. This includes mechanism of the large coherent vortex structure formation, small length scale generation and flow randomization. The widely spread concept vortex breakdown to turbulence,which was considered as the last stage of flow transition, is not observed and is found theoretically incorrect. The classical theory on boundary layer transition is challenged and we proposed a new theory with five steps, i.e. receptivity, linear instability, large vortex formation, small length scale generation, loss of symmetry and randomization to turbulence. We have also proposed a new theory about turbulence generation. The new theory shows that all small length scales (turbulence) are generated by shear layer instability which is produced by large vortex structure with multiple level vortex rings, multiple level sweeps and ejections, and multiple level negative and positive spikes near the laminar sub-layers.Therefore, turbulence is not generated by vortex breakdown but rather positive and negative spikes and consequent high shear layers. Shear layer instability is considered as the mother of turbulence. This new theory may give a universal mechanism for turbulence generation and sustenance which shows that the energy is brought by large vortex structure through multiple level sweeps.
[ { "created": "Tue, 25 Feb 2014 15:09:25 GMT", "version": "v1" } ]
2014-02-26
[ [ "Liu", "Chaoqun", "" ], [ "Lu", "Ping", "" ] ]
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1402.6200
Romain Pierrat
Q. Baudouin, R. Pierrat, A. Eloy, E.J. Nunes-Pereira, P.-A. Cuniasse, N. Mercadier and R. Kaiser
Signatures of L\'evy flights with annealed disorder
null
null
10.1103/PhysRevE.90.052114
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present theoretical and experimental results of L\'evy flights of light originating from a random walk of photons in a hot atomic vapor. In contrast to systems with quenched disorder, this system does not present any correlations between the position and the step length of the random walk. In an analytical model based on microscopic first principles including Doppler broadening we find anomalous L\'evy-type superdiffusion corresponding to a single-step size distribution P(x) proportional to x^(-1-alpha), with alpha=1. We show that this step size distribution leads to a violation of Ohm's law [T_(diff) proportional to L^(-alpha/2) different from 1/L], as expected for a L\'evy walk of independent steps. Furthermore the spatial profile of the transmitted light develops power law tails [I(r) proportional to r^(-3-alpha)]. In an experiment using a slab geometry with hot rubidium vapor, we measured the total diffuse transmission T_(diff) and the spatial profile of the transmitted light T_{diff}(r). We obtained the microscopic L\'evy parameter alpha under macroscopic multiple scattering conditions paving the way to investigation of L\'evy flights in different atomic physics and astrophysics systems.
[ { "created": "Tue, 25 Feb 2014 15:24:43 GMT", "version": "v1" }, { "created": "Thu, 11 Sep 2014 17:10:27 GMT", "version": "v2" } ]
2015-06-18
[ [ "Baudouin", "Q.", "" ], [ "Pierrat", "R.", "" ], [ "Eloy", "A.", "" ], [ "Nunes-Pereira", "E. J.", "" ], [ "Cuniasse", "P. -A.", "" ], [ "Mercadier", "N.", "" ], [ "Kaiser", "R.", "" ] ]
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1402.6208
Thomas Lansdall-Welfare
Ilias Flaounas, Thomas Lansdall-Welfare, Panagiota Antonakaki, Nello Cristianini
The Anatomy of a Modular System for Media Content Analysis
Updated to include previously missing figures
null
null
null
cs.MA cs.AI cs.DC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Intelligent systems for the annotation of media content are increasingly being used for the automation of parts of social science research. In this domain the problem of integrating various Artificial Intelligence (AI) algorithms into a single intelligent system arises spontaneously. As part of our ongoing effort in automating media content analysis for the social sciences, we have built a modular system by combining multiple AI modules into a flexible framework in which they can cooperate in complex tasks. Our system combines data gathering, machine translation, topic classification, extraction and annotation of entities and social networks, as well as many other tasks that have been perfected over the past years of AI research. Over the last few years, it has allowed us to realise a series of scientific studies over a vast range of applications including comparative studies between news outlets and media content in different countries, modelling of user preferences, and monitoring public mood. The framework is flexible and allows the design and implementation of modular agents, where simple modules cooperate in the annotation of a large dataset without central coordination.
[ { "created": "Tue, 25 Feb 2014 15:45:16 GMT", "version": "v1" }, { "created": "Mon, 4 Jun 2018 16:25:07 GMT", "version": "v2" } ]
2018-06-05
[ [ "Flaounas", "Ilias", "" ], [ "Lansdall-Welfare", "Thomas", "" ], [ "Antonakaki", "Panagiota", "" ], [ "Cristianini", "Nello", "" ] ]
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1402.6214
Fabio Bagarello Dr.
F. Bagarello, F. Oliveri
Dynamics of closed ecosystems described by operators
null
Ecological Modeling, {\bf 275}, 89-99 (2014)
null
null
physics.bio-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We adopt the so--called \emph{occupation number representation}, originally used in quantum mechanics and recently adopted in the description of several classical systems, in the analysis of the dynamics of some models of closed ecosystems. In particular, we discuss two linear models, for which the solution can be found analytically, and a nonlinear system, for which we produce numerical results. We also discuss how a damping effect could be {\em effectively} implemented in the model.
[ { "created": "Tue, 25 Feb 2014 15:52:30 GMT", "version": "v1" } ]
2014-02-26
[ [ "Bagarello", "F.", "" ], [ "Oliveri", "F.", "" ] ]
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1402.6219
Ayman Bahaa-Eldin
Ola M. Hegazy, Ayman M. Bahaa-Eldin, Yasser H. Dakroury
Quantum Secure Direct Communication using Entanglement and Super Dense Coding
SECRYPT 2009. arXiv admin note: text overlap with arXiv:quant-ph/0612114 by other authors
null
null
null
quant-ph cs.CR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper introduces a new quantum protocol for secure direct communication. This protocol is based on Entanglement and Super-Dense coding. In this paper we present some basic definitions of entanglement in quantum mechanics, present how to use the maximally entangled states known as Bell States, and super dense coding technique to achieve secure direct message communication. Finally, we will apply some error models that could affect the transmission of the quantum data on the quantum channels, and how to treat these errors and acquire a safe transmission of the data.
[ { "created": "Tue, 21 Jan 2014 10:08:35 GMT", "version": "v1" } ]
2014-02-26
[ [ "Hegazy", "Ola M.", "" ], [ "Bahaa-Eldin", "Ayman M.", "" ], [ "Dakroury", "Yasser H.", "" ] ]
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1402.6225
Xuzhen Zhu
Xuzhen Zhu, Hui Tian, Shimin Cai, Tao Zhou
Predicting missing links via significant paths
6 pages, 2 figures
null
10.1209/0295-5075/106/18008
null
physics.soc-ph cs.SI physics.data-an
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Link prediction plays an important role in understanding intrinsic evolving mechanisms of networks. With the belief that the likelihood of the existence of a link between two nodes is strongly related with their similarity, many methods have been proposed to calculate node similarity based on node attributes and/or topological structures. Among a large variety of methods that take into account paths connecting the target pair of nodes, most of which neglect the heterogeneity of those paths. Our hypothesis is that a path consisting of small-degree nodes provides a strong evidence of similarity between two ends, accordingly, we propose a so-called sig- nificant path index in this Letter to leverage intermediate nodes' degrees in similarity calculation. Empirical experiments on twelve disparate real networks demonstrate that the proposed index outperforms the mainstream link prediction baselines.
[ { "created": "Tue, 25 Feb 2014 16:20:02 GMT", "version": "v1" }, { "created": "Wed, 26 Feb 2014 11:51:29 GMT", "version": "v2" }, { "created": "Tue, 3 Feb 2015 05:32:42 GMT", "version": "v3" } ]
2015-06-18
[ [ "Zhu", "Xuzhen", "" ], [ "Tian", "Hui", "" ], [ "Cai", "Shimin", "" ], [ "Zhou", "Tao", "" ] ]
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1402.6228
Aleks Reinhardt
Aleks Reinhardt and Daan Frenkel
Numerical evidence for nucleated self-assembly of DNA brick structures
null
Phys. Rev. Lett. 112, 238103 (2014)
10.1103/PhysRevLett.112.238103
null
cond-mat.soft cond-mat.mtrl-sci cond-mat.stat-mech physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The observation by Ke et al. [Science 338, 1177 (2012)] that large numbers of short, pre-designed DNA strands can assemble into three-dimensional target structures came as a great surprise, as no colloidal self-assembling system has ever achieved the same degree of complexity. That failure seemed easy to rationalise: the larger the number of distinct building blocks, the higher the expected error rate for self-assembly. The experiments of Ke et al. have disproved this argument. Here, we report Monte Carlo simulations of the self-assembly of a DNA brick cube, comprising approximately 1000 types of DNA strand, using a simple model. We model the DNA strands as lattice tetrahedra with attractive patches, the interaction strengths of which are computed using a standard thermodynamic model. We find that, within a narrow temperature window, the target structure assembles with high probability. Our simulations suggest that mis-assembly is disfavoured because of a slow nucleation step. As our model incorporates no aspect of DNA other than its binding properties, these simulations suggest that, with proper design of the building blocks, other systems, such as colloids, may also assemble into truly complex structures.
[ { "created": "Tue, 25 Feb 2014 16:33:02 GMT", "version": "v1" }, { "created": "Fri, 25 Apr 2014 16:53:22 GMT", "version": "v2" } ]
2014-06-12
[ [ "Reinhardt", "Aleks", "" ], [ "Frenkel", "Daan", "" ] ]
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1402.6234
Dominic Lee DPhil
Dominic J.(O') Lee
Self-consistent treatment of electrostatics in molecular DNA braiding through external forces
23 Pages, 6 figures, 2 tables, typos corrected, new references and paragraph in discussion section
Phys. Rev. E 89, 062711 (2014)
10.1103/PhysRevE.89.062711
null
cond-mat.soft cond-mat.stat-mech physics.bio-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we consider a physical system in which two DNA molecules braid about each other. The distance between the two molecular ends, on either side of the braid, is held at a distance much larger than supercoiling radius of the braid. The system is subjected to an external pulling force, and a moment that induces the braiding. In a model, developed for understanding such a system, we assume that each molecule can be divided into a braided and unbraided section. We also suppose that the DNA is nicked so that there is no constraint of the individual linking numbers of the molecules. Included in the model are steric and electrostatic interactions, thermal fluctuations of the braided and unbraided sections of the molecule, as well as the constraint on the braid linking (catenation) number. We compare two approximations used in estimating the free energy of the braided section. One is where the amplitude of undulations of one molecule with respect to the other is determined only by steric interactions. The other is a self-consistent determination of the mean squared amplitude of these undulations. In this second approximation electrostatics should play an important role in determining this quantity, as suggested by physical arguments. We see that if the electrostatic interaction is sufficiently large there are indeed notable differences between the two approximations. We go on to test the self-consistent approximation, included in the full model, against experimental data, for such a system, and we find good agreement. However, there seems to by a slight left/right handed braid asymmetry in some of the experimental results. We discuss what might be the origin of this small asymmetry
[ { "created": "Tue, 25 Feb 2014 16:37:32 GMT", "version": "v1" }, { "created": "Fri, 28 Mar 2014 17:57:29 GMT", "version": "v2" } ]
2014-07-02
[ [ "J.", "Dominic", "", "O'" ], [ "Lee", "", "" ] ]
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1402.6238
Jobin Wilson
Jobin Wilson, Santanu Chaudhury, Brejesh Lall, Prateek Kapadia
Improving Collaborative Filtering based Recommenders using Topic Modelling
null
null
null
null
cs.IR cs.CL cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Standard Collaborative Filtering (CF) algorithms make use of interactions between users and items in the form of implicit or explicit ratings alone for generating recommendations. Similarity among users or items is calculated purely based on rating overlap in this case,without considering explicit properties of users or items involved, limiting their applicability in domains with very sparse rating spaces. In many domains such as movies, news or electronic commerce recommenders, considerable contextual data in text form describing item properties is available along with the rating data, which could be utilized to improve recommendation quality.In this paper, we propose a novel approach to improve standard CF based recommenders by utilizing latent Dirichlet allocation (LDA) to learn latent properties of items, expressed in terms of topic proportions, derived from their textual description. We infer user's topic preferences or persona in the same latent space,based on her historical ratings. While computing similarity between users, we make use of a combined similarity measure involving rating overlap as well as similarity in the latent topic space. This approach alleviates sparsity problem as it allows calculation of similarity between users even if they have not rated any items in common. Our experiments on multiple public datasets indicate that the proposed hybrid approach significantly outperforms standard user Based and item Based CF recommenders in terms of classification accuracy metrics such as precision, recall and f-measure.
[ { "created": "Tue, 25 Feb 2014 16:52:05 GMT", "version": "v1" } ]
2014-02-26
[ [ "Wilson", "Jobin", "" ], [ "Chaudhury", "Santanu", "" ], [ "Lall", "Brejesh", "" ], [ "Kapadia", "Prateek", "" ] ]
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1402.6239
Andr\'e Nichterlein
Sepp Hartung and Clemens Hoffmann and Andr\'e Nichterlein
Improved Upper and Lower Bound Heuristics for Degree Anonymization in Social Networks
null
null
null
null
cs.SI cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Motivated by a strongly growing interest in anonymizing social network data, we investigate the NP-hard Degree Anonymization problem: given an undirected graph, the task is to add a minimum number of edges such that the graph becomes k-anonymous. That is, for each vertex there have to be at least k-1 other vertices of exactly the same degree. The model of degree anonymization has been introduced by Liu and Terzi [ACM SIGMOD'08], who also proposed and evaluated a two-phase heuristic. We present an enhancement of this heuristic, including new algorithms for each phase which significantly improve on the previously known theoretical and practical running times. Moreover, our algorithms are optimized for large-scale social networks and provide upper and lower bounds for the optimal solution. Notably, on about 26 % of the real-world data we provide (provably) optimal solutions; whereas in the other cases our upper bounds significantly improve on known heuristic solutions.
[ { "created": "Tue, 25 Feb 2014 16:53:32 GMT", "version": "v1" } ]
2014-02-26
[ [ "Hartung", "Sepp", "" ], [ "Hoffmann", "Clemens", "" ], [ "Nichterlein", "André", "" ] ]
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1402.6243
Ahmed Alaa
Ahmed M. Alaa and Omar A. Nasr
Globally Optimal Cooperation in Dense Cognitive Radio Networks
null
null
null
null
cs.NI cs.IT math.IT
http://creativecommons.org/licenses/by/3.0/
The problem of calculating the local and global decision thresholds in hard decisions based cooperative spectrum sensing is well known for its mathematical intractability. Previous work relied on simple suboptimal counting rules for decision fusion in order to avoid the exhaustive numerical search required for obtaining the optimal thresholds. However, these simple rules are not globally optimal as they do not maximize the overall global detection probability by jointly selecting local and global thresholds. Instead, they maximize the detection probability for a specific global threshold. In this paper, a globally optimal decision fusion rule for Primary User signal detection based on the Neyman- Pearson (NP) criterion is derived. The algorithm is based on a novel representation for the global performance metrics in terms of the regularized incomplete beta function. Based on this mathematical representation, it is shown that the globally optimal NP hard decision fusion test can be put in the form of a conventional one dimensional convex optimization problem. A binary search for the global threshold can be applied yielding a complexity of O(log2(N)), where N represents the number of cooperating users. The logarithmic complexity is appreciated because we are concerned with dense networks, and thus N is expected to be large. The proposed optimal scheme outperforms conventional counting rules, such as the OR, AND, and MAJORITY rules. It is shown via simulations that, although the optimal rule tends to the simple OR rule when the number of cooperating secondary users is small, it offers significant SNR gain in dense cognitive radio networks with large number of cooperating users.
[ { "created": "Tue, 25 Feb 2014 17:04:11 GMT", "version": "v1" } ]
2014-02-26
[ [ "Alaa", "Ahmed M.", "" ], [ "Nasr", "Omar A.", "" ] ]
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1402.6245
Richard McClatchey
Jetendr Shamdasani, Andrew Branson, Richard McClatchey
Towards Provenance and Traceability in CRISTAL for HEP
5 pages and 1 figure. 20th International Conference on Computing in High Energy and Nuclear Physics (CHEP13). 14-18th October 2013. Amsterdam, Netherlands. To appear in Journal of Physics Conference Series
null
10.1088/1742-6596/513/3/032091
null
cs.SE physics.comp-ph physics.data-an
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper discusses the CRISTAL object lifecycle management system and its use in provenance data management and the traceability of system events. This software was initially used to capture the construction and calibration of the CMS ECAL detector at CERN for later use by physicists in their data analysis. Some further uses of CRISTAL in different projects (CMS, neuGRID and N4U) are presented as examples of its flexible data model. From these examples, applications are drawn for the High Energy Physics domain and some initial ideas for its use in data preservation HEP are outlined in detail in this paper. Currently investigations are underway to gauge the feasibility of using the N4U Analysis Service or a derivative of it to address the requirements of data and analysis logging and provenance capture within the HEP long term data analysis environment.
[ { "created": "Mon, 24 Feb 2014 10:16:43 GMT", "version": "v1" } ]
2015-06-18
[ [ "Shamdasani", "Jetendr", "" ], [ "Branson", "Andrew", "" ], [ "McClatchey", "Richard", "" ] ]
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1402.6246
Sebastiano Vigna
Sebastiano Vigna
An experimental exploration of Marsaglia's xorshift generators, scrambled
null
null
null
null
cs.DS cs.CR cs.MS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Marsaglia proposed recently xorshift generators as a class of very fast, good-quality pseudorandom number generators. Subsequent analysis by Panneton and L'Ecuyer has lowered the expectations raised by Marsaglia's paper, showing several weaknesses of such generators, verified experimentally using the TestU01 suite. Nonetheless, many of the weaknesses of xorshift generators fade away if their result is scrambled by a non-linear operation (as originally suggested by Marsaglia). In this paper we explore the space of possible generators obtained by multiplying the result of a xorshift generator by a suitable constant. We sample generators at 100 equispaced points of their state space and obtain detailed statistics that lead us to choices of parameters that improve on the current ones. We then explore for the first time the space of high-dimensional xorshift generators, following another suggestion in Marsaglia's paper, finding choices of parameters providing periods of length $2^{1024} - 1$ and $2^{4096} - 1$. The resulting generators are of extremely high quality, faster than current similar alternatives, and generate long-period sequences passing strong statistical tests using only eight logical operations, one addition and one multiplication by a constant.
[ { "created": "Wed, 22 Jan 2014 19:18:20 GMT", "version": "v1" }, { "created": "Sun, 23 Mar 2014 18:54:48 GMT", "version": "v2" }, { "created": "Mon, 14 Dec 2015 09:44:46 GMT", "version": "v3" }, { "created": "Sun, 3 Jan 2016 23:36:58 GMT", "version": "v4" }, { "created": "Thu, 13 Oct 2016 06:56:03 GMT", "version": "v5" } ]
2016-10-14
[ [ "Vigna", "Sebastiano", "" ] ]
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An experimental exploration of Marsaglia's xorshift generators, scrambled
http://arxiv.org/abs/1402.6246v5
http://arxiv.org/pdf/1402.6246v5.pdf
https://github.com/lemire/testingRNG
false
false
https://paperswithcode.com/paper/an-experimental-exploration-of-marsaglia-s
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1402.6249
Grigory Kazakevich
Grigory Kazakevich, Rolland Johnson, Gene Flanagan, Frank Marhauser (Muons, Inc., USA) Vyacheslav Yakovlev, Brian Chase, Valeri Lebedev, Sergei Nagaitsev, Ralph Pasquinelli, Nikolay Solyak, Kenneth Quinn, Daniel Wolff, (Fermilab, USA) and Viatcheslav Pavlov, (Budker Institute of Nuclear Physics (BINP), Russia)
High-power magnetron transmitter as an RF source for superconducting linear accelerators
12 pages, 19 figures
null
10.1016/j.nima.2014.05.069
null
physics.acc-ph
http://creativecommons.org/licenses/by/3.0/
A concept of a high-power magnetron transmitter for operation within a wideband control feedback loop in phase and amplitude is presented. This transmitter is proposed to drive Superconducting RF (SRF) cavities for intensity-frontier GeV-scale proton/ion linacs. The transmitter performance at the dynamic control was verified in experiments with CW, S-Band, 1 kW magnetrons. The wideband control of magnetrons, required for the superconducting linacs, was realized using the magnetrons, injection-locked by the phase-modulated signals. The capabilities of the magnetrons injection-locked by the phase-modulated signals and adequateness for feeding of SRF cavities were verified by measurements of the transfer function magnitude characteristics of single and 2-cascade magnetrons, by measurements the magnetrons phase performance and by measurements of spectra of the carrier frequency. At the ratio of power of locking signal to output power less than -13 dB (in 2-cascade scheme per magnetron, respectively) we demonstrated a phase modulation bandwidth of over 1.0 MHz. The carrier frequency spectrum width about of 1 Hz at the level less than -60 dBc did not demonstrate broadening at wide range of magnitude and frequency of the phase modulation of the injection-locking signal. The wideband dynamic control of output power of the transmitter model was first experimentally demonstrated using two magnetrons, combined in power and injection-locked by the phase-modulated signals. The experiments with the injection-locked magnetrons adequately emulated the wideband dynamic control with a feedback control system, which will allow suppressing all known parasitic modulation of the accelerating field in the SRF cavities. The magnetron transmitter concept, tests of the setups and injection-locking of magnetrons by phase-modulated signals are discussed in this work.
[ { "created": "Tue, 25 Feb 2014 17:26:13 GMT", "version": "v1" } ]
2015-06-18
[ [ "Kazakevich", "Grigory", "", "Muons, Inc., USA" ], [ "Johnson", "Rolland", "", "Muons, Inc., USA" ], [ "Flanagan", "Gene", "", "Muons, Inc., USA" ], [ "Marhauser", "Frank", "", "Muons, Inc., USA" ], [ "Yakovlev", "Vyacheslav", "" ], [ "Chase", "Brian", "" ], [ "Lebedev", "Valeri", "" ], [ "Nagaitsev", "Sergei", "" ], [ "Pasquinelli", "Ralph", "" ], [ "Solyak", "Nikolay", "" ], [ "Quinn", "Kenneth", "" ], [ "Wolff", "Daniel", "" ], [ "Pavlov", "Viatcheslav", "" ] ]
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1402.6268
B. Kaulakys
V. Gineityte
Quasi-classical alternatives in quantum chemistry
70 pages
null
null
null
physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The article contains an overview of authors achievements in development of alternative quantum-chemical approaches oriented towards revival of the classical tradition of qualitative chemical thinking instead of obtaining numerical results. The above-mentioned tradition is concluded to be based mainly on principles (rules) of additivity, transferability and locality of molecular properties. Accordingly, model Hamiltonian matrices are used in the approaches under development (called quasi-classical alternatives), wherein algebraic parameters play the role of matrix elements and these are assumed to be transferable for similar atoms and/or atomic orbitals in addition. Further, passing to delocalized descriptions of electronic structures (as usual) is expected to be the main origin of difficulties seeking to formulate quasi-classical alternatives. In the framework of the canonical method of molecular orbitals (MOs), delocalization is shown to be partially avoidable by invoking a recently-suggested approach to secular (eigenvalue) equations for model Hamiltonian matrices, wherein the usual initial imposing of the zero-determinant condition is replaced by a certain reformulation of the problem itself. The most efficient way of achieving the same end, however, is shown to consist in passing to non-canonical one-electron problems. The latter may be exemplified by the block-diagonalization problem for the relevant Hamiltonian matrix following from the Brillouin theorem and yielding non-canonical (localized) MOs and by the commutation equation for the respective one-electron density matrix (charge- bond order matrix). In this connection, most of attention is paid in the article to perturbative solutions of the above-mentioned non-canonical problems and to their implications, including common quantum-chemical descriptions of entire classes of chemical compounds.
[ { "created": "Tue, 25 Feb 2014 18:21:43 GMT", "version": "v1" } ]
2014-02-26
[ [ "Gineityte", "V.", "" ] ]
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1402.6269
Ilya Dodin
I. Y. Dodin and N. J. Fisch
On the nature of kinetic electrostatic electron nonlinear (KEEN) waves
null
null
10.1063/1.4868230
null
physics.plasm-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
An analytical theory is proposed for the kinetic electrostatic electron nonlinear (KEEN) waves originally found in simulations by Afeyan et al [arXiv:1210.8105]. We suggest that KEEN waves represent saturated states of the negative mass instability (NMI) reported recently by Dodin et al [Phys. Rev. Lett. 110, 215006 (2013)]. Due to the NMI, trapped electrons form macroparticles that produce field oscillations at harmonics of the bounce frequency. At large enough amplitudes, these harmonics can phase-lock to the main wave and form stable nonlinear dissipationless structures that are nonstationary but otherwise similar to Bernstein-Greene-Kruskal modes. The theory explains why the formation of KEEN modes is sensitive to the excitation scenario and yields estimates that agree with the numerical results of Afeyan et al. A new type of KEEN wave may be possible at even larger amplitudes of the driving field than those used in simulations so far.
[ { "created": "Tue, 25 Feb 2014 18:24:16 GMT", "version": "v1" } ]
2015-06-18
[ [ "Dodin", "I. Y.", "" ], [ "Fisch", "N. J.", "" ] ]
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1402.6273
Georgios Askalidis
Georgios Askalidis, Randall A. Berry and Vijay G. Subramanian
Explaining Snapshots of Network Diffusions: Structural and Hardness Results
14 pages, 3 figures
null
null
null
cs.SI physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Much research has been done on studying the diffusion of ideas or technologies on social networks including the \textit{Influence Maximization} problem and many of its variations. Here, we investigate a type of inverse problem. Given a snapshot of the diffusion process, we seek to understand if the snapshot is feasible for a given dynamic, i.e., whether there is a limited number of nodes whose initial adoption can result in the snapshot in finite time. While similar questions have been considered for epidemic dynamics, here, we consider this problem for variations of the deterministic Linear Threshold Model, which is more appropriate for modeling strategic agents. Specifically, we consider both sequential and simultaneous dynamics when deactivations are allowed and when they are not. Even though we show hardness results for all variations we consider, we show that the case of sequential dynamics with deactivations allowed is significantly harder than all others. In contrast, sequential dynamics make the problem trivial on cliques even though it's complexity for simultaneous dynamics is unknown. We complement our hardness results with structural insights that can help better understand diffusions of social networks under various dynamics.
[ { "created": "Tue, 25 Feb 2014 18:36:51 GMT", "version": "v1" }, { "created": "Fri, 25 Apr 2014 10:17:27 GMT", "version": "v2" } ]
2014-04-28
[ [ "Askalidis", "Georgios", "" ], [ "Berry", "Randall A.", "" ], [ "Subramanian", "Vijay G.", "" ] ]
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1402.6274
Jimmy Joel Mas\'ias Meza M.Sc.
Jimmy J. Mas\'ias-Meza (1) and Sergio Dasso (2,3) ((1) Departamento de F\'isica (FCEN-UBA-IFIBA), Buenos Aires, Argentina (2) Departamento de F\'isica (FCEN-UBA), Buenos Aires, Argentina (3) Instituto de Astronom\'ia y F\'isica del Espacio (UBA-CONICET), Buenos Aires, Argentina)
Geomagnetic effects on cosmic ray propagation under different conditions for Buenos Aires and Marambio, Argentina
9 pages
Sun and Geosphere Vol.9, p. 41-47, No.1 - 2014
null
null
astro-ph.SR physics.space-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The geomagnetic field (Bgeo) sets a lower cutoff rigidity (Rc) to the entry of cosmic particles to Earth which depends on the geomagnetic activity. From numerical simulations of the trajectory of a proton using different models for Bgeo (performed with the MAGCOS code), we use backtracking to analyze particles arriving at the location of two nodes of the net LAGO (Large Aperture Gamma ray burst Observatory) that will be built in the near future: Buenos Aires and Marambio (Antarctica), Argentina. We determine the asymptotic trajectories and the values of Rc for different incidence directions, for each node. Simulations were done using several models for Bgeo that emulate different geomagnetic conditions. The presented results will help to make analysis of future observations of the flux of cosmic rays done at these two LAGO nodes.
[ { "created": "Tue, 25 Feb 2014 18:47:38 GMT", "version": "v1" } ]
2014-02-26
[ [ "Masías-Meza", "Jimmy J.", "" ], [ "Dasso", "Sergio", "" ] ]
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1402.6275
David Shwa
Boaz Lubotzky, David Shwa, Tao Kong, Nadav Katz and Guy Ron
Power broadening effects on Electromagnetically Induced Transparency in $^{20}$Ne vapor
5 pages, 5 figures
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null
null
physics.optics physics.atom-ph quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We report here the first observation of electromagnetically induced transparency (EIT) in $^{20}$Ne. The power broadening of the EIT linewidth is measured as a function of neon pressure and RF excitation power. Doppler effects on the EIT broadening are found even at low pressures and low intensities, where the linewidth should be governed only by homogeneous effects.
[ { "created": "Tue, 25 Feb 2014 18:48:54 GMT", "version": "v1" } ]
2014-02-26
[ [ "Lubotzky", "Boaz", "" ], [ "Shwa", "David", "" ], [ "Kong", "Tao", "" ], [ "Katz", "Nadav", "" ], [ "Ron", "Guy", "" ] ]
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1402.6276
Edgardo Rold\'an-Pensado
Leonardo Mart\'inez and Edgardo Rold\'an-Pensado
Points defining triangles with distinct circumradii
null
Acta Mathematica Hungarica, 2015, 145
10.1007/s10474-014-0443-z
null
math.MG cs.CG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Paul Erdos asked if, among sufficiently many points in general position, there are always $k$ points such that all the circles through $3$ of these $k$ points have different radii. He later proved that this is indeed the case. However, he overlooked a non-trivial case in his proof. In this note we deal with this case using B\'ezout's Theorem on the number of intersection points of two curves and obtain a polynomial bound for the needed number of points.
[ { "created": "Tue, 25 Feb 2014 18:50:35 GMT", "version": "v1" } ]
2015-10-13
[ [ "Martínez", "Leonardo", "" ], [ "Roldán-Pensado", "Edgardo", "" ] ]
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1402.6278
Vitaly Feldman
Vitaly Feldman and David Xiao
Sample Complexity Bounds on Differentially Private Learning via Communication Complexity
Extended abstract appears in Conference on Learning Theory (COLT) 2014
null
null
null
cs.DS cs.CC cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this work we analyze the sample complexity of classification by differentially private algorithms. Differential privacy is a strong and well-studied notion of privacy introduced by Dwork et al. (2006) that ensures that the output of an algorithm leaks little information about the data point provided by any of the participating individuals. Sample complexity of private PAC and agnostic learning was studied in a number of prior works starting with (Kasiviswanathan et al., 2008) but a number of basic questions still remain open, most notably whether learning with privacy requires more samples than learning without privacy. We show that the sample complexity of learning with (pure) differential privacy can be arbitrarily higher than the sample complexity of learning without the privacy constraint or the sample complexity of learning with approximate differential privacy. Our second contribution and the main tool is an equivalence between the sample complexity of (pure) differentially private learning of a concept class $C$ (or $SCDP(C)$) and the randomized one-way communication complexity of the evaluation problem for concepts from $C$. Using this equivalence we prove the following bounds: 1. $SCDP(C) = \Omega(LDim(C))$, where $LDim(C)$ is the Littlestone's (1987) dimension characterizing the number of mistakes in the online-mistake-bound learning model. Known bounds on $LDim(C)$ then imply that $SCDP(C)$ can be much higher than the VC-dimension of $C$. 2. For any $t$, there exists a class $C$ such that $LDim(C)=2$ but $SCDP(C) \geq t$. 3. For any $t$, there exists a class $C$ such that the sample complexity of (pure) $\alpha$-differentially private PAC learning is $\Omega(t/\alpha)$ but the sample complexity of the relaxed $(\alpha,\beta)$-differentially private PAC learning is $O(\log(1/\beta)/\alpha)$. This resolves an open problem of Beimel et al. (2013b).
[ { "created": "Tue, 25 Feb 2014 19:00:15 GMT", "version": "v1" }, { "created": "Wed, 26 Feb 2014 04:14:50 GMT", "version": "v2" }, { "created": "Tue, 27 May 2014 02:06:43 GMT", "version": "v3" }, { "created": "Sun, 13 Sep 2015 04:53:25 GMT", "version": "v4" } ]
2015-09-15
[ [ "Feldman", "Vitaly", "" ], [ "Xiao", "David", "" ] ]
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1402.6281
Tomasz Brengos
Tomasz Brengos
On coalgebras with internal moves
Article: 23 pages, Appendix: 3 pages
null
null
null
cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In the first part of the paper we recall the coalgebraic approach to handling the so-called invisible transitions that appear in different state-based systems semantics. We claim that these transitions are always part of the unit of a certain monad. Hence, coalgebras with internal moves are exactly coalgebras over a monadic type. The rest of the paper is devoted to supporting our claim by studying two important behavioural equivalences for state-based systems with internal moves, namely: weak bisimulation and trace semantics. We continue our research on weak bisimulations for coalgebras over order enriched monads. The key notions used in this paper and proposed by us in our previous work are the notions of an order saturation monad and a saturator. A saturator operator can be intuitively understood as a reflexive, transitive closure operator. There are two approaches towards defining saturators for coalgebras with internal moves. Here, we give necessary conditions for them to yield the same notion of weak bisimulation. Finally, we propose a definition of trace semantics for coalgebras with silent moves via a uniform fixed point operator. We compare strong and weak bisimilation together with trace semantics for coalgebras with internal steps.
[ { "created": "Tue, 25 Feb 2014 19:12:55 GMT", "version": "v1" } ]
2014-02-26
[ [ "Brengos", "Tomasz", "" ] ]
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1402.6282
Ayad Ghany Ismaeel
Ayad Ghany Ismaeel, Nur Gaylan Hamead
Mobile GIS and Open Source Platform Based on Android: Technology for System Pregnant Women
8 pages, 16 figures, 1 Table
International Journal of Scientific & Engineering Research, Volume 5, Issue 2, February-2014, Pages 847-854
10.14299/000000
null
cs.CY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The statistic of World Health Organization shows at one year about 287000 women died most of them during and following pregnancy and childbirth in Africa and south Asia. This paper suggests system for serving pregnant women using open source based on Android technology, the proposed system works based on mobile GIS to select closest care centre or hospital maternity on Google map for the pregnant woman, which completed an online registration by sending SMS via GPRS network (or internet) contains her name and phone number and region (Longitude and Latitude) and other required information the server will save the information in server database then find the closest care centre and call her for first review at the selected care centre, the proposed system allowed the pregnant women from her location (home, market, etc) can send a help request in emergency cases (via SMS by click one button) contains the ID for this pregnant woman, and her coordinates (Longitude and Latitude) via GPRS network, then the server will locate the pregnant on Google map and retrieve the pregnant information from the database. This information will be used by the server to send succoring to pregnant woman at her location and at the same time notify the nearest hospital and moreover, the server will send SMS over IP to inform her husband and the hospital doctors. Implement and applied this proposed system of pregnant women shows more effective cost than other systems because it works in economic mode (SMS), and the services of proposed system are flexible (open source platform) as well as rapidly (mobile GIS based on Android) achieved locally registration, succoring in emergency cases, change the review date of pregnant woman, addition to different types of advising according to pregnancy. Index Terms: Build-in GPS; GPRS; Mobile GIS; SoIP; Open Source; Google Maps API ; Android Technology
[ { "created": "Tue, 25 Feb 2014 19:14:44 GMT", "version": "v1" } ]
2014-02-26
[ [ "Ismaeel", "Ayad Ghany", "" ], [ "Hamead", "Nur Gaylan", "" ] ]
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1402.6284
Salvatore Stagira
M. Negro, H. Ruf, B. Fabre, F. Dorchies, M. Devetta, D. Staedter, C. Vozzi, Y. Mairesse, S. Stagira
$\mathrm{CO_2}$ exploding clusters dynamics probed by XUV fluorescence
null
null
10.1088/1367-2630/16/7/073004
null
physics.atm-clus
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Clusters excited by intense laser pulses are a unique source of warm dense matter, that has been the subject of intensive experimental studies. The majority of those investigations concerns atomic clusters, whereas the evolution of molecular clusters excited by intense laser pulses is less explored. In this work we trace the dynamics of $\mathrm{CO_2}$ clusters triggered by a few-cycle 1.45-$\mu$m driving pulse through the detection of XUV fluorescence induced by a delayed 800-nm ignition pulse. Striking differences among fluorescence dynamics from different ionic species are observed.
[ { "created": "Tue, 25 Feb 2014 19:23:19 GMT", "version": "v1" } ]
2015-06-18
[ [ "Negro", "M.", "" ], [ "Ruf", "H.", "" ], [ "Fabre", "B.", "" ], [ "Dorchies", "F.", "" ], [ "Devetta", "M.", "" ], [ "Staedter", "D.", "" ], [ "Vozzi", "C.", "" ], [ "Mairesse", "Y.", "" ], [ "Stagira", "S.", "" ] ]
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1402.6286
Richard Kueng
David Gross, Felix Krahmer, and Richard Kueng
Improved Recovery Guarantees for Phase Retrieval from Coded Diffraction Patterns
28 pages, in press, Applied and Computational Harmonic Analysis (2015)
Applied and Computational Harmonic Analysis 42(1), 37-64 (2016)
10.1016/j.acha.2015.05.004
null
cs.IT math.IT quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this work we analyze the problem of phase retrieval from Fourier measurements with random diffraction patterns. To this end, we consider the recently introduced PhaseLift algorithm, which expresses the problem in the language of convex optimization. We provide recovery guarantees which require O(log^2 d) different diffraction patterns, thus improving on recent results by Candes et al. [arXiv:1310.3240], which require O(log^4 d) different patterns.
[ { "created": "Tue, 25 Feb 2014 19:31:07 GMT", "version": "v1" }, { "created": "Tue, 26 Jan 2016 11:19:35 GMT", "version": "v2" } ]
2017-01-10
[ [ "Gross", "David", "" ], [ "Krahmer", "Felix", "" ], [ "Kueng", "Richard", "" ] ]
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1402.6288
Markus Strohmaier
Silvia Mitter, Claudia Wagner, Markus Strohmaier
A categorization scheme for socialbot attacks in online social networks
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cs.SI physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In the past, online social networks (OSN) like Facebook and Twitter became powerful instruments for communication and networking. Unfortunately, they have also become a welcome target for socialbot attacks. Therefore, a deep understanding of the nature of such attacks is important to protect the Eco-System of OSNs. In this extended abstract we propose a categorization scheme of social bot attacks that aims at providing an overview of the state of the art of techniques in this emerging field. Finally, we demonstrate the usefulness of our categorization scheme by characterizing recent socialbot attacks according to our categorization scheme.
[ { "created": "Tue, 25 Feb 2014 19:35:57 GMT", "version": "v1" } ]
2014-02-26
[ [ "Mitter", "Silvia", "" ], [ "Wagner", "Claudia", "" ], [ "Strohmaier", "Markus", "" ] ]
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1402.6289
Markus Strohmaier
Silvia Mitter, Claudia Wagner, Markus Strohmaier
Understanding the impact of socialbot attacks in online social networks
null
null
null
null
cs.SI physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Online social networks (OSN) like Twitter or Facebook are popular and powerful since they allow reaching millions of users online. They are also a popular target for socialbot attacks. Without a deep understanding of the impact of such attacks, the potential of online social networks as an instrument for facilitating discourse or democratic processes is in jeopardy. In this extended abstract we present insights from a live lab experiment in which social bots aimed at manipulating the social graph of an online social network, in our case Twitter. We explored the link creation behavior between targeted human users and our results suggest that socialbots may indeed have the ability to shape and influence the social graph in online social networks. However, our results also show that external factors may play an important role in the creation of social links in OSNs.
[ { "created": "Tue, 25 Feb 2014 19:36:58 GMT", "version": "v1" } ]
2014-02-26
[ [ "Mitter", "Silvia", "" ], [ "Wagner", "Claudia", "" ], [ "Strohmaier", "Markus", "" ] ]
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1402.6294
Eoin Long
Peter Keevash, Eoin Long
Frankl-R\"odl type theorems for codes and permutations
18 pages
null
null
null
math.CO cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We give a new proof of the Frankl-R\"odl theorem on forbidden intersections, via the probabilistic method of dependent random choice. Our method extends to codes with forbidden distances, where over large alphabets our bound is significantly better than that obtained by Frankl and R\"odl. We also apply our bound to a question of Ellis on sets of permutations with forbidden distances, and to establish a weak form of a conjecture of Alon, Shpilka and Umans on sunflowers.
[ { "created": "Tue, 25 Feb 2014 20:02:24 GMT", "version": "v1" } ]
2014-02-26
[ [ "Keevash", "Peter", "" ], [ "Long", "Eoin", "" ] ]
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1402.6295
Wei Liu
Wei Liu, LiDong Pan, and N.P. Armitage
A broadband microwave Corbino spectrometer at $^3$He temperatures and high magnetic fields
null
Rev. Sci. Instrum. 85, 093108 (2014)
10.1063/1.4895798
null
physics.ins-det cond-mat.supr-con
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present the technical details of a broadband microwave spectrometer for measuring the complex conductance of thin films covering the range from 50 MHz up to 16 GHz in the temperature range 300 mK to 6 K and at applied magnetic fields up to 8 Tesla. We measure the complex reflection from a sample terminating a coaxial transmission line and calibrate the signals with three standards with known reflection coefficients. Thermal isolation of the heat load from the inner conductor is accomplished by including a section of NbTi superconducting cable (transition temperature around 8 $-$ 9 K) and hermetic seal glass bead adapters. This enables us to stabilize the base temperature of the sample stage at 300 mK. However, the inclusion of this superconducting cable complicates the calibration procedure. We document the effects of the superconducting cable on our calibration procedure and the effects of applied magnetic fields and how we control the temperature with great repeatability for each measurement. We have successfully extracted reliable data in this frequency, temperature and field range for thin superconducting films and highly resistive graphene samples.
[ { "created": "Tue, 25 Feb 2014 20:04:47 GMT", "version": "v1" } ]
2015-06-18
[ [ "Liu", "Wei", "" ], [ "Pan", "LiDong", "" ], [ "Armitage", "N. P.", "" ] ]
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1402.6299
Alberto Montina
Alberto Montina, Stefan Wolf
Necessary and sufficient optimality conditions for classical simulations of quantum communication processes
Corrected some typos and replaced the (dim) proof of Theorem 1 with a much more elegant one. This paper is the extended journal version of the conference version arXiv:1401.4126. The journal version contains considerable new material. See comment to the first version for a list of the new material
Phys. Rev. A 90, 012309 (2014)
10.1103/PhysRevA.90.012309
null
quant-ph cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider the process consisting of preparation, transmission through a quantum channel, and subsequent measurement of quantum states. The communication complexity of the channel is the minimal amount of classical communication required for classically simulating it. Recently, we reduced the computation of this quantity to a convex minimization problem with linear constraints. Every solution of the constraints provides an upper bound on the communication complexity. In this paper, we derive the dual maximization problem of the original one. The feasible points of the dual constraints, which are inequalities, give lower bounds on the communication complexity, as illustrated with an example. The optimal values of the two problems turn out to be equal (zero duality gap). By this property, we provide necessary and sufficient conditions for optimality in terms of a set of equalities and inequalities. We use these conditions and two reasonable but unproven hypotheses to derive the lower bound $n 2^{n-1}$ for a noiseless quantum channel with capacity equal to $n$ qubits. This lower bound can have interesting consequences in the context of the recent debate on the reality of the quantum state.
[ { "created": "Tue, 25 Feb 2014 20:15:17 GMT", "version": "v1" }, { "created": "Mon, 3 Mar 2014 00:53:21 GMT", "version": "v2" } ]
2014-11-21
[ [ "Montina", "Alberto", "" ], [ "Wolf", "Stefan", "" ] ]
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1402.6305
Stephane Boucheron
Boucheron Stephane and Elisabeth Gassiat and Mesrob I. Ohannessian
About Adaptive Coding on Countable Alphabets: Max-Stable Envelope Classes
null
null
null
null
cs.IT math.IT math.ST stat.TH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we study the problem of lossless universal source coding for stationary memoryless sources on countably infinite alphabets. This task is generally not achievable without restricting the class of sources over which universality is desired. Building on our prior work, we propose natural families of sources characterized by a common dominating envelope. We particularly emphasize the notion of adaptivity, which is the ability to perform as well as an oracle knowing the envelope, without actually knowing it. This is closely related to the notion of hierarchical universal source coding, but with the important difference that families of envelope classes are not discretely indexed and not necessarily nested. Our contribution is to extend the classes of envelopes over which adaptive universal source coding is possible, namely by including max-stable (heavy-tailed) envelopes which are excellent models in many applications, such as natural language modeling. We derive a minimax lower bound on the redundancy of any code on such envelope classes, including an oracle that knows the envelope. We then propose a constructive code that does not use knowledge of the envelope. The code is computationally efficient and is structured to use an {E}xpanding {T}hreshold for {A}uto-{C}ensoring, and we therefore dub it the \textsc{ETAC}-code. We prove that the \textsc{ETAC}-code achieves the lower bound on the minimax redundancy within a factor logarithmic in the sequence length, and can be therefore qualified as a near-adaptive code over families of heavy-tailed envelopes. For finite and light-tailed envelopes the penalty is even less, and the same code follows closely previous results that explicitly made the light-tailed assumption. Our technical results are founded on methods from regular variation theory and concentration of measure.
[ { "created": "Tue, 25 Feb 2014 20:33:56 GMT", "version": "v1" }, { "created": "Fri, 17 Apr 2015 14:20:25 GMT", "version": "v2" } ]
2015-04-20
[ [ "Stephane", "Boucheron", "" ], [ "Gassiat", "Elisabeth", "" ], [ "Ohannessian", "Mesrob I.", "" ] ]
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1402.6306
Stefano Martiniani
Stefano Martiniani, Jacob D. Stevenson, David J. Wales and Daan Frenkel
Superposition Enhanced Nested Sampling
null
Phys. Rev. X 4, 031034 (2014)
10.1103/PhysRevX.4.031034
null
cond-mat.stat-mech astro-ph.IM physics.data-an
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The theoretical analysis of many problems in physics, astronomy and applied mathematics requires an efficient numerical exploration of multimodal parameter spaces that exhibit broken ergodicity. Monte Carlo methods are widely used to deal with these classes of problems, but such simulations suffer from a ubiquitous sampling problem: the probability of sampling a particular state is proportional to its entropic weight. Devising an algorithm capable of sampling efficiently the full phase space is a long-standing problem. Here we report a new hybrid method for the exploration of multimodal parameter spaces exhibiting broken ergodicity. Superposition enhanced nested sampling (SENS) combines the strengths of global optimization with the unbiased/athermal sampling of nested sampling, greatly enhancing its efficiency with no additional parameters. We report extensive tests of this new approach for atomic clusters that are known to have energy landscapes for which conventional sampling schemes suffer from broken ergodicity. We also introduce a novel parallelization algorithm for nested sampling.
[ { "created": "Tue, 25 Feb 2014 20:34:09 GMT", "version": "v1" }, { "created": "Mon, 2 Jun 2014 16:48:48 GMT", "version": "v2" } ]
2014-09-02
[ [ "Martiniani", "Stefano", "" ], [ "Stevenson", "Jacob D.", "" ], [ "Wales", "David J.", "" ], [ "Frenkel", "Daan", "" ] ]
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1402.6310
Jasine Babu
Jasine Babu and Manu Basavaraju and L Sunil Chandran and Deepak Rajendraprasad and Naveen Sivadasan
Approximating the Cubicity of Trees
null
null
null
null
cs.DM cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Cubicity of a graph $G$ is the smallest dimension $d$, for which $G$ is a unit disc graph in ${\mathbb{R}}^d$, under the $l^\infty$ metric, i.e. $G$ can be represented as an intersection graph of $d$-dimensional (axis-parallel) unit hypercubes. We call such an intersection representation a $d$-dimensional cube representation of $G$. Computing cubicity is known to be inapproximable in polynomial time, within an $O(n^{1-\epsilon})$ factor for any $\epsilon >0$, unless NP=ZPP. In this paper, we present a randomized algorithm that runs in polynomial time and computes cube representations of trees, of dimension within a constant factor of the optimum. It is also shown that the cubicity of trees can be approximated within a constant factor in deterministic polynomial time, if the cube representation is not required to be computed. As far as we know, this is the first constant factor approximation algorithm for computing the cubicity of trees. It is not yet clear whether computing the cubicity of trees is NP-hard or not.
[ { "created": "Tue, 25 Feb 2014 20:42:16 GMT", "version": "v1" } ]
2014-02-26
[ [ "Babu", "Jasine", "" ], [ "Basavaraju", "Manu", "" ], [ "Chandran", "L Sunil", "" ], [ "Rajendraprasad", "Deepak", "" ], [ "Sivadasan", "Naveen", "" ] ]
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1402.6314
Guenter Muhrer
G. Muhrer
Cold Crystal Reflector Filter Concept
null
null
null
null
physics.ins-det
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper the theoretical concept of a cold crystal reflector filter will be presented. The aim of this concept is to balance the shortcoming of the traditional cold polycrystalline reflector filter, which lies in the significant reduction of the neutron flux right above (in energy space) or right below (wavelength space) the first Bragg edge.
[ { "created": "Tue, 25 Feb 2014 20:57:45 GMT", "version": "v1" } ]
2014-02-26
[ [ "Muhrer", "G.", "" ] ]
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1402.6316
Mark Leggett B.Sc. Ph.D.
L.M.W.Leggett and D.A. Ball
Correlations of the first and second derivatives of atmospheric CO2 with global surface temperature and the El Nino-Southern Oscillation respectively
null
null
null
null
physics.ao-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Understanding current global climate requires an understanding of trends both in Earth's atmospheric temperature and the El Nino-Southern Oscillation (ENSO), a characteristic large-scale distribution of warm water in the tropical Pacific Ocean and the dominant mode of year-to-year climate variability (Holbrook et al. 2009. However, despite much effort, the average projection of current climate models has become statistically significantly different from the observed 21st century global surface temperature trend (Fyfe 2013)and has failed to reflect the statistically significant evidence that annual-mean global temperature has not risen in the 21st century (Fyfe 2013, Kosaka 2013). Modelling also provides a wide range of predictions for future ENSO variability, some showing an increase, others a decrease and some no change (Guilyardi, et al. 2012; Bellenger, 2013). Here we present correlations which include the current era and do not have these drawbacks. The correlations arise as follows. First it has been shown (Kuo 1990, Wang W. et al. 2013) that the rate of change of the level of atmospheric CO2 (expressed as its first derivative) has a time-trend signature which is statistically significantly similar to that for global surface temperature. Second, we show here that the rate of this change - the second derivative of the level of atmospheric CO2 - is statistically significantly correlated with the separate signature displayed by the El Nino-Southern Oscillation. Third, we show that second-derivative atmospheric CO2 leads ENSO, first-derivative CO2 and temperature. Taken together the foregoing three points provide further lines of evidence for the key role of atmospheric CO2 as a driver of global climate. The results may also contribute to more accurate prediction of future global climate.
[ { "created": "Tue, 25 Feb 2014 21:31:22 GMT", "version": "v1" } ]
2014-02-27
[ [ "Leggett", "L. M. W.", "" ], [ "Ball", "D. A.", "" ] ]
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1402.6317
Pablo Dorta-Gonzalez
Pablo Dorta-Gonzalez, Maria Isabel Dorta-Gonzalez, Dolores Rosa Santos-Penate, Rafael Suarez-Vega
Journal topic citation potential and between-field comparisons: The topic normalized impact factor
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null
null
null
cs.DL
http://creativecommons.org/licenses/by/3.0/
The journal impact factor is not comparable among fields of science and social science because of systematic differences in publication and citation behaviour across disciplines. In this work, a source normalization of the journal impact factor is proposed. We use the aggregate impact factor of the citing journals as a measure of the citation potential in the journal topic, and we employ this citation potential in the normalization of the journal impact factor to make it comparable between scientific fields. An empirical application comparing some impact indicators with our topic normalized impact factor in a set of 224 journals from four different fields shows that our normalization, using the citation potential in the journal topic, reduces the between-group variance with respect to the within-group variance in a higher proportion than the rest of indicators analysed. The effect of journal self-citations over the normalization process is also studied.
[ { "created": "Tue, 25 Feb 2014 13:11:52 GMT", "version": "v1" } ]
2014-02-27
[ [ "Dorta-Gonzalez", "Pablo", "" ], [ "Dorta-Gonzalez", "Maria Isabel", "" ], [ "Santos-Penate", "Dolores Rosa", "" ], [ "Suarez-Vega", "Rafael", "" ] ]
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1402.6361
Tomer Koren
Aharon Ben-Tal, Elad Hazan, Tomer Koren, Shie Mannor
Oracle-Based Robust Optimization via Online Learning
null
null
null
null
math.OC cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Robust optimization is a common framework in optimization under uncertainty when the problem parameters are not known, but it is rather known that the parameters belong to some given uncertainty set. In the robust optimization framework the problem solved is a min-max problem where a solution is judged according to its performance on the worst possible realization of the parameters. In many cases, a straightforward solution of the robust optimization problem of a certain type requires solving an optimization problem of a more complicated type, and in some cases even NP-hard. For example, solving a robust conic quadratic program, such as those arising in robust SVM, ellipsoidal uncertainty leads in general to a semidefinite program. In this paper we develop a method for approximately solving a robust optimization problem using tools from online convex optimization, where in every stage a standard (non-robust) optimization program is solved. Our algorithms find an approximate robust solution using a number of calls to an oracle that solves the original (non-robust) problem that is inversely proportional to the square of the target accuracy.
[ { "created": "Tue, 25 Feb 2014 22:06:58 GMT", "version": "v1" } ]
2014-02-27
[ [ "Ben-Tal", "Aharon", "" ], [ "Hazan", "Elad", "" ], [ "Koren", "Tomer", "" ], [ "Mannor", "Shie", "" ] ]
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1402.6366
Mustafa Abdul Salam
Osman Hegazy, Omar S. Soliman and Mustafa Abdul Salam
LSSVM-ABC Algorithm for Stock Price prediction
12 pages. International Journal of Computer Trends and Technology (IJCTT)2014
null
null
null
cs.CE cs.NE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, Artificial Bee Colony (ABC) algorithm which inspired from the behavior of honey bees swarm is presented. ABC is a stochastic population-based evolutionary algorithm for problem solving. ABC algorithm, which is considered one of the most recently swarm intelligent techniques, is proposed to optimize least square support vector machine (LSSVM) to predict the daily stock prices. The proposed model is based on the study of stocks historical data, technical indicators and optimizing LSSVM with ABC algorithm. ABC selects best free parameters combination for LSSVM to avoid over-fitting and local minima problems and improve prediction accuracy. LSSVM optimized by Particle swarm optimization (PSO) algorithm, LSSVM, and ANN techniques are used for comparison with proposed model. Proposed model tested with twenty datasets representing different sectors in S&P 500 stock market. Results presented in this paper show that the proposed model has fast convergence speed, and it also achieves better accuracy than compared techniques in most cases.
[ { "created": "Tue, 25 Feb 2014 23:02:08 GMT", "version": "v1" } ]
2014-02-28
[ [ "Hegazy", "Osman", "" ], [ "Soliman", "Omar S.", "" ], [ "Salam", "Mustafa Abdul", "" ] ]
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1402.6373
Satoru Morita
Satoru Morita and Jin Yoshimura
Disadvantages of Preferential Dispersals in Fluctuating Environments
null
J. Phys. Soc. Jpn. 84, 034801 (2015)
10.7566/JPSJ.84.034801
null
q-bio.PE cond-mat.stat-mech physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
It has not been known whether preferential dispersal is adaptive in fluctuating environments. We investigate the effect of preferential and random dispersals in bet-hedging systems by using a discrete stochastic metapopulation model, where each site fluctuates between good and bad environments with temporal correlation. To explore the optimal migration pattern, an analytical estimation of the total growth is derived by mean field approximation. We found that the preference for fertile sites is disadvantageous when transportation among sites has a cost or the sensitivity of preference is high.
[ { "created": "Tue, 25 Feb 2014 23:27:48 GMT", "version": "v1" } ]
2015-11-12
[ [ "Morita", "Satoru", "" ], [ "Yoshimura", "Jin", "" ] ]
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1402.6379
Dorian Gangloff
Polnop Samutpraphoot, Sophie Weber, Qian Lin, Dorian Gangloff, Alexei Bylinskii, Boris Braverman, Akio Kawasaki, Christoph Raab, Wilhelm Kaenders, Vladan Vuleti\'c
Passive intrinsic-linewidth narrowing of ultraviolet extended-cavity diode laser by weak optical feedback
8 pages, 3 figures
Opt. Express 23, 11592-11599 (2014)
10.1364/OE.22.011592
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a simple method for narrowing the intrinsic Lorentzian linewidth of a commercial ultraviolet grating extended-cavity diode laser (TOPTICA DL Pro) using weak optical feedback from a long external cavity. We achieve a suppression in frequency noise spectral density of 20 dB measured at frequencies around 1 MHz, corresponding to the narrowing of the intrinsic Lorentzian linewidth from 200 kHz to 2 kHz. The system is suitable for experiments requiring a tunable ultraviolet laser with narrow linewidth and low high-frequency noise, such as precision spectroscopy, optical clocks, and quantum information science experiments.
[ { "created": "Tue, 25 Feb 2014 23:59:58 GMT", "version": "v1" } ]
2015-08-14
[ [ "Samutpraphoot", "Polnop", "" ], [ "Weber", "Sophie", "" ], [ "Lin", "Qian", "" ], [ "Gangloff", "Dorian", "" ], [ "Bylinskii", "Alexei", "" ], [ "Braverman", "Boris", "" ], [ "Kawasaki", "Akio", "" ], [ "Raab", "Christoph", "" ], [ "Kaenders", "Wilhelm", "" ], [ "Vuletić", "Vladan", "" ] ]
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1402.6383
Chunhua Shen
Sakrapee Paisitkriangkrai, Chunhua Shen, Anton van den Hengel
Large-margin Learning of Compact Binary Image Encodings
13 pages
null
10.1109/TIP.2014.2337759
null
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The use of high-dimensional features has become a normal practice in many computer vision applications. The large dimension of these features is a limiting factor upon the number of data points which may be effectively stored and processed, however. We address this problem by developing a novel approach to learning a compact binary encoding, which exploits both pair-wise proximity and class-label information on training data set. Exploiting this extra information allows the development of encodings which, although compact, outperform the original high-dimensional features in terms of final classification or retrieval performance. The method is general, in that it is applicable to both non-parametric and parametric learning methods. This generality means that the embedded features are suitable for a wide variety of computer vision tasks, such as image classification and content-based image retrieval. Experimental results demonstrate that the new compact descriptor achieves an accuracy comparable to, and in some cases better than, the visual descriptor in the original space despite being significantly more compact. Moreover, any convex loss function and convex regularization penalty (e.g., $ \ell_p $ norm with $ p \ge 1 $) can be incorporated into the framework, which provides future flexibility.
[ { "created": "Wed, 26 Feb 2014 00:22:50 GMT", "version": "v1" } ]
2015-06-18
[ [ "Paisitkriangkrai", "Sakrapee", "" ], [ "Shen", "Chunhua", "" ], [ "Hengel", "Anton van den", "" ] ]
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1402.6384
Mayur Bubna
M. Bubna, E. Alagoz, A. Krzywda, O. Koybasi, K. Arndt, D. Bortoletto, I. Shipsey, G. Bolla, A. Kok, T.-E. Hansen, T. A. Hansen, G. U. Jensen, J. M. Brom, M. Boscardin, J. Chramowicz, J. Cumalat, G. F. Dalla Betta, M. Dinardo, A. Godshalk, M. Jones, M. D. Krohn, A. Kumar, C. M. Lei, L. Moroni, L. Perera, M. Povoli, A. Prosser, R. Rivera, A. Solano, M. M. Obertino, S. Kwan, L. Uplegger, C. D. Via, L. Vigani, S. Wagner
Testbeam and Laboratory Characterization of CMS 3D Pixel Sensors
14 pages
null
10.1088/1748-0221/9/07/C07019
null
physics.ins-det hep-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The pixel detector is the innermost tracking device in CMS, reconstructing interaction vertices and charged particle trajectories. The sensors located in the innermost layers of the pixel detector must be upgraded for the ten-fold increase in luminosity expected with the High- Luminosity LHC (HL-LHC) phase. As a possible replacement for planar sensors, 3D silicon technology is under consideration due to its good performance after high radiation fluence. In this paper, we report on pre- and post- irradiation measurements for CMS 3D pixel sensors with different electrode configurations. The effects of irradiation on electrical properties, charge collection efficiency, and position resolution of 3D sensors are discussed. Measurements of various test structures for monitoring the fabrication process and studying the bulk and surface properties, such as MOS capacitors, planar and gate-controlled diodes are also presented.
[ { "created": "Wed, 26 Feb 2014 00:32:46 GMT", "version": "v1" }, { "created": "Wed, 30 Apr 2014 20:55:45 GMT", "version": "v2" } ]
2015-06-18
[ [ "Bubna", "M.", "" ], [ "Alagoz", "E.", "" ], [ "Krzywda", "A.", "" ], [ "Koybasi", "O.", "" ], [ "Arndt", "K.", "" ], [ "Bortoletto", "D.", "" ], [ "Shipsey", "I.", "" ], [ "Bolla", "G.", "" ], [ "Kok", "A.", "" ], [ "Hansen", "T. -E.", "" ], [ "Hansen", "T. A.", "" ], [ "Jensen", "G. U.", "" ], [ "Brom", "J. M.", "" ], [ "Boscardin", "M.", "" ], [ "Chramowicz", "J.", "" ], [ "Cumalat", "J.", "" ], [ "Betta", "G. F. Dalla", "" ], [ "Dinardo", "M.", "" ], [ "Godshalk", "A.", "" ], [ "Jones", "M.", "" ], [ "Krohn", "M. D.", "" ], [ "Kumar", "A.", "" ], [ "Lei", "C. M.", "" ], [ "Moroni", "L.", "" ], [ "Perera", "L.", "" ], [ "Povoli", "M.", "" ], [ "Prosser", "A.", "" ], [ "Rivera", "R.", "" ], [ "Solano", "A.", "" ], [ "Obertino", "M. M.", "" ], [ "Kwan", "S.", "" ], [ "Uplegger", "L.", "" ], [ "Via", "C. D.", "" ], [ "Vigani", "L.", "" ], [ "Wagner", "S.", "" ] ]
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1402.6386
Si Chen
Si Chen, Miho Shimada, Norio Nakamura, Senlin Huang, Kexin Liu, Jia-er Chen
Beam breakup simulation study for high energy ERL
null
null
10.1088/1674-1137/39/1/017006
null
physics.acc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The maximum beam current can be accelerated in an Energy Recovery Linac (ERL) can be severely limited by the transverse multi-pass beam breakup instability (BBU), especially in future ERL light sources with multi-GeV high energy beam energy and more than 100 mA average current. In this paper, the multi-pass BBU of such a high energy ERL is studied based on the simulation on a 3-GeV ERL light source proposed by KEK. It is expected to provide a reference to the future high energy ERL projects by this work.
[ { "created": "Wed, 26 Feb 2014 01:16:20 GMT", "version": "v1" } ]
2015-06-18
[ [ "Chen", "Si", "" ], [ "Shimada", "Miho", "" ], [ "Nakamura", "Norio", "" ], [ "Huang", "Senlin", "" ], [ "Liu", "Kexin", "" ], [ "Chen", "Jia-er", "" ] ]
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1402.6387
Jen Hong Tan
Jen Hong Tan, U. Rajendra Acharya
Active spline model: A shape based model-interactive segmentation
submitted to Computers in biology and Medicine, second revision
null
null
null
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Rarely in literature a method of segmentation cares for the edit after the algorithm delivers. They provide no solution when segmentation goes wrong. We propose to formulate point distribution model in terms of centripetal-parameterized Catmull-Rom spline. Such fusion brings interactivity to model-based segmentation, so that edit is better handled. When the delivered segment is unsatisfactory, user simply shifts points to vary the curve. We ran the method on three disparate imaging modalities and achieved an average overlap of 0.879 for automated lung segmentation on chest radiographs. The edit afterward improved the average overlap to 0.945, with a minimum of 0.925. The source code and the demo video are available at http://wp.me/p3vCKy-2S
[ { "created": "Wed, 26 Feb 2014 01:32:48 GMT", "version": "v1" } ]
2014-02-27
[ [ "Tan", "Jen Hong", "" ], [ "Acharya", "U. Rajendra", "" ] ]
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1402.6389
George Bowden Mr
George Bowden, Axel K\"onies, Matthew Hole, Nikolai Gorelenkov, Graham Dennis
Comparison of methods for numerical calculation of continuum damping
19 pages, 9 figures
null
10.1063/1.4879802
null
physics.plasm-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Continuum resonance damping is an important factor in determining the stability of certain global modes in fusion plasmas. A number of analytic and numerical approaches have been developed to compute this damping, particularly in the case of the toroidicity-induced shear Alfv\'en eigenmode. This paper compares results obtained using an analytical perturbative approach with those found using resistive and complex contour numerical approaches. It is found that the perturbative method does not provide accurate agreement with reliable numerical methods for the range of parameters examined. This discrepancy exists even in the limit where damping approaches zero. When the perturbative technique is implemented using a standard finite element method, the damping estimate fails to converge with radial grid resolution. The finite elements used cannot accurately represent the eigenmode in the region of the continuum resonance, regardless of the number of radial grid points used.
[ { "created": "Wed, 26 Feb 2014 01:50:40 GMT", "version": "v1" } ]
2015-06-18
[ [ "Bowden", "George", "" ], [ "Könies", "Axel", "" ], [ "Hole", "Matthew", "" ], [ "Gorelenkov", "Nikolai", "" ], [ "Dennis", "Graham", "" ] ]
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1402.6396
Aili Maimaiti
J. M. Ward, A. Maimaiti, Vu H. Le and S. Nic Chormaic
Optical Micro- and Nanofiber Pulling Rig
null
Rev. Sci. Instrum. 85, 111501 (2014)
10.1063/1.4901098
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We review the method of producing adiabatic optical micro- and nanofibers using a hydrogen/oxygen flame brushing technique. The flame is scanned along the fiber, which is being simultaneously stretched by two translation stages. The tapered fiber fabrication is reproducible and yields highly adiabatic tapers with either exponential or linear profiles. Details regarding the setup of the flame brushing rig and the various parameters used are presented. Information available from the literature is compiled and further details that are necessary to have a functioning pulling rig are included. This should enable the reader to fabricate various taper profiles, while achieving adiabatic transmission of ~ 99% for fundamental mode propagation. Using this rig, transmissions ranging from 85-95% for higher order modes in an optical nanofiber have been obtained.
[ { "created": "Wed, 26 Feb 2014 02:21:37 GMT", "version": "v1" }, { "created": "Sun, 19 Oct 2014 12:01:16 GMT", "version": "v2" } ]
2015-12-11
[ [ "Ward", "J. M.", "" ], [ "Maimaiti", "A.", "" ], [ "Le", "Vu H.", "" ], [ "Chormaic", "S. Nic", "" ] ]
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1402.6399
Xueliang Li
Ruihu Li, Xueliang Li, Yaping Mao, Meiqin Wei
Formally self-dual linear binary codes from circulant graphs
15 pages
null
null
null
math.CO cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In 2002, Tonchev first constructed some linear binary codes defined by the adjacency matrices of undirected graphs. So, graph is an important tool for searching optimum codes. In this paper, we introduce a new method of searching (proposed) optimum formally self-dual linear binary codes from circulant graphs.
[ { "created": "Wed, 26 Feb 2014 02:38:40 GMT", "version": "v1" }, { "created": "Thu, 27 Feb 2014 10:18:20 GMT", "version": "v2" }, { "created": "Mon, 31 Mar 2014 10:03:41 GMT", "version": "v3" } ]
2014-04-01
[ [ "Li", "Ruihu", "" ], [ "Li", "Xueliang", "" ], [ "Mao", "Yaping", "" ], [ "Wei", "Meiqin", "" ] ]
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1402.6404
David Conti
David Conti, Nigel Boston
On the Algebraic Structure of Linear Trellises
53 pages. Submitted to IEEE Transactions on Information Theory. Some parts of this paper were presented at the 2012 International Zurich Seminar on Communications and the 2012 Allerton conference
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cs.IT cs.DM math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Trellises are crucial graphical representations of codes. While conventional trellises are well understood, the general theory of (tail-biting) trellises is still under development. Iterative decoding concretely motivates such theory. In this paper we first develop a new algebraic framework for a systematic analysis of linear trellises which enables us to address open foundational questions. In particular, we present a useful and powerful characterization of linear trellis isomorphy. We also obtain a new proof of the Factorization Theorem of Koetter/Vardy and point out unnoticed problems for the group case. Next, we apply our work to: describe all the elementary trellis factorizations of linear trellises and consequently to determine all the minimal linear trellises for a given code; prove that nonmergeable one-to-one linear trellises are strikingly determined by the edge-label sequences of certain closed paths; prove self-duality theorems for minimal linear trellises; analyze quasi-cyclic linear trellises and consequently extend results on reduced linear trellises to nonreduced ones. To achieve this, we also provide new insight into mergeability and path connectivity properties of linear trellises. Our classification results are important for iterative decoding as we show that minimal linear trellises can yield different pseudocodewords even if they have the same graph structure.
[ { "created": "Wed, 26 Feb 2014 04:07:47 GMT", "version": "v1" } ]
2014-02-27
[ [ "Conti", "David", "" ], [ "Boston", "Nigel", "" ] ]
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1402.6407
Daniel Lemire
Samy Chambi, Daniel Lemire, Owen Kaser, Robert Godin
Better bitmap performance with Roaring bitmaps
null
Software: Practice and Experience Volume 46, Issue 5, pages 709-719, May 2016
10.1002/spe.2325
null
cs.DB
http://creativecommons.org/licenses/by/4.0/
Bitmap indexes are commonly used in databases and search engines. By exploiting bit-level parallelism, they can significantly accelerate queries. However, they can use much memory, and thus we might prefer compressed bitmap indexes. Following Oracle's lead, bitmaps are often compressed using run-length encoding (RLE). Building on prior work, we introduce the Roaring compressed bitmap format: it uses packed arrays for compression instead of RLE. We compare it to two high-performance RLE-based bitmap encoding techniques: WAH (Word Aligned Hybrid compression scheme) and Concise (Compressed `n' Composable Integer Set). On synthetic and real data, we find that Roaring bitmaps (1) often compress significantly better (e.g., 2 times) and (2) are faster than the compressed alternatives (up to 900 times faster for intersections). Our results challenge the view that RLE-based bitmap compression is best.
[ { "created": "Wed, 26 Feb 2014 04:38:22 GMT", "version": "v1" }, { "created": "Tue, 15 Mar 2016 19:31:53 GMT", "version": "v10" }, { "created": "Thu, 27 Feb 2014 23:34:18 GMT", "version": "v2" }, { "created": "Tue, 4 Mar 2014 22:45:23 GMT", "version": "v3" }, { "created": "Fri, 6 Jun 2014 17:55:23 GMT", "version": "v4" }, { "created": "Wed, 19 Nov 2014 18:25:55 GMT", "version": "v5" }, { "created": "Tue, 2 Dec 2014 19:17:31 GMT", "version": "v6" }, { "created": "Wed, 3 Dec 2014 15:36:12 GMT", "version": "v7" }, { "created": "Wed, 11 Mar 2015 17:50:04 GMT", "version": "v8" }, { "created": "Sat, 28 Mar 2015 14:45:00 GMT", "version": "v9" } ]
2016-04-12
[ [ "Chambi", "Samy", "" ], [ "Lemire", "Daniel", "" ], [ "Kaser", "Owen", "" ], [ "Godin", "Robert", "" ] ]
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Better bitmap performance with Roaring bitmaps
http://arxiv.org/abs/1402.6407v10
http://arxiv.org/pdf/1402.6407v10.pdf
https://github.com/lemire/RoaringBitmap
false
false
https://paperswithcode.com/paper/better-bitmap-performance-with-roaring
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1402.6411
Matthew Wetstein
I. Anghel, J. F. Beacom, M. Bergevin, G. Davies, F. Di Lodovico, A. Elagin, H. Frisch, R. Hill, G. Jocher, T. Katori, J. Learned, R. Northrop, C. Pilcher, E. Ramberg, M.C. Sanchez, M. Smy, H. Sobel, R. Svoboda, S. Usman, M. Vagins, G. Varner, R. Wagner, M. Wetstein, L. Winslow, M. Yeh
Expression of Interest: The Atmospheric Neutrino Neutron Interaction Experiment (ANNIE)
Submitted for the January 2014 Fermilab Physics Advisory Committee meeting
null
null
null
physics.ins-det hep-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Neutron tagging in Gadolinium-doped water may play a significant role in reducing backgrounds from atmospheric neutrinos in next generation proton-decay searches using megaton-scale Water Cherenkov detectors. Similar techniques might also be useful in the detection of supernova neutrinos. Accurate determination of neutron tagging efficiencies will require a detailed understanding of the number of neutrons produced by neutrino interactions in water as a function of momentum transferred. We propose the Atmospheric Neutrino Neutron Interaction Experiment (ANNIE), designed to measure the neutron yield of atmospheric neutrino interactions in gadolinium-doped water. An innovative aspect of the ANNIE design is the use of precision timing to localize interaction vertices in the small fiducial volume of the detector. We propose to achieve this by using early production of LAPPDs (Large Area Picosecond Photodetectors). This experiment will be a first application of these devices demonstrating their feasibility for Water Cherenkov neutrino detectors.
[ { "created": "Wed, 26 Feb 2014 05:09:48 GMT", "version": "v1" } ]
2014-02-27
[ [ "Anghel", "I.", "" ], [ "Beacom", "J. F.", "" ], [ "Bergevin", "M.", "" ], [ "Davies", "G.", "" ], [ "Di Lodovico", "F.", "" ], [ "Elagin", "A.", "" ], [ "Frisch", "H.", "" ], [ "Hill", "R.", "" ], [ "Jocher", "G.", "" ], [ "Katori", "T.", "" ], [ "Learned", "J.", "" ], [ "Northrop", "R.", "" ], [ "Pilcher", "C.", "" ], [ "Ramberg", "E.", "" ], [ "Sanchez", "M. C.", "" ], [ "Smy", "M.", "" ], [ "Sobel", "H.", "" ], [ "Svoboda", "R.", "" ], [ "Usman", "S.", "" ], [ "Vagins", "M.", "" ], [ "Varner", "G.", "" ], [ "Wagner", "R.", "" ], [ "Wetstein", "M.", "" ], [ "Winslow", "L.", "" ], [ "Yeh", "M.", "" ] ]
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1402.6416
Anton van den Hengel
Anton van den Hengel, John Bastian, Anthony Dick, Lachlan Fleming
Deconstruction of compound objects from image sets
null
null
null
null
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose a method to recover the structure of a compound object from multiple silhouettes. Structure is expressed as a collection of 3D primitives chosen from a pre-defined library, each with an associated pose. This has several advantages over a volume or mesh representation both for estimation and the utility of the recovered model. The main challenge in recovering such a model is the combinatorial number of possible arrangements of parts. We address this issue by exploiting the sparse nature of the problem, and show that our method scales to objects constructed from large libraries of parts.
[ { "created": "Wed, 26 Feb 2014 05:37:41 GMT", "version": "v1" } ]
2014-02-27
[ [ "Hengel", "Anton van den", "" ], [ "Bastian", "John", "" ], [ "Dick", "Anthony", "" ], [ "Fleming", "Lachlan", "" ] ]
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1402.6421
Nicolas Moro
Nicolas Moro (LIP6, SAS-ENSMSE, LETI), Amine Dehbaoui (SAS-ENSMSE), Karine Heydemann (LIP6), Bruno Robisson (SAS-ENSMSE, LETI), Emmanuelle Encrenaz (LIP6)
Electromagnetic fault injection: towards a fault model on a 32-bit microcontroller
10 pages
10th workshop on Fault Diagnosis and Tolerance in Cryptography - FDTC 2013, Santa-Barbara : United States (2013)
10.1109/FDTC.2013.9
null
cs.CR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Injection of transient faults as a way to attack cryptographic implementations has been largely studied in the last decade. Several attacks that use electromagnetic fault injection against hardware or software architectures have already been presented. On microcontrollers, electromagnetic fault injection has mostly been seen as a way to skip assembly instructions or subroutine calls. However, to the best of our knowledge, no precise study about the impact of an electromagnetic glitch fault injection on a microcontroller has been proposed yet. The aim of this paper is twofold: providing a more in-depth study of the effects of electromagnetic glitch fault injection on a state-of-the-art microcontroller and building an associated register-transfer level fault model.
[ { "created": "Wed, 26 Feb 2014 05:56:59 GMT", "version": "v1" } ]
2014-02-27
[ [ "Moro", "Nicolas", "", "LIP6, SAS-ENSMSE, LETI" ], [ "Dehbaoui", "Amine", "", "SAS-ENSMSE" ], [ "Heydemann", "Karine", "", "LIP6" ], [ "Robisson", "Bruno", "", "SAS-ENSMSE, LETI" ], [ "Encrenaz", "Emmanuelle", "", "LIP6" ] ]
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1402.6422
Shama Islam
Shama N. Islam, Salman Durrani and Parastoo Sadeghi
A Novel User Pairing Scheme for Functional Decode-and-Forward Multi-way Relay Network
30 pages, 6 figures, submitted for journal publication
Elsevier Physical Communication, vol. 17, pp. 128-148, Dec. 2015
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we consider a functional decode and forward (FDF) multi-way relay network (MWRN) where a common user facilitates each user in the network to obtain messages from all other users. We propose a novel user pairing scheme, which is based on the principle of selecting a common user with the best average channel gain. This allows the user with the best channel conditions to contribute to the overall system performance. Assuming lattice code based transmissions, we derive upper bounds on the average common rate and the average sum rate with the proposed pairing scheme. Considering M-ary quadrature amplitude modulation with square constellation as a special case of lattice code transmission, we derive asymptotic average symbol error rate (SER) of the MWRN. We show that in terms of the achievable rates, the proposed pairing scheme outperforms the existing pairing schemes under a wide range of channel scenarios. The proposed pairing scheme also has lower average SER compared to existing schemes. We show that overall, the MWRN performance with the proposed pairing scheme is more robust, compared to existing pairing schemes, especially under worst case channel conditions when majority of users have poor average channel gains.
[ { "created": "Wed, 26 Feb 2014 05:59:09 GMT", "version": "v1" }, { "created": "Fri, 18 Jul 2014 03:11:29 GMT", "version": "v2" }, { "created": "Wed, 24 Sep 2014 02:04:44 GMT", "version": "v3" } ]
2016-08-19
[ [ "Islam", "Shama N.", "" ], [ "Durrani", "Salman", "" ], [ "Sadeghi", "Parastoo", "" ] ]
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1402.6428
Vishakha Metre VAM
Jayshree Ghorpade-Aher and Vishakha A. Metre
Clustering Multidimensional Data with PSO based Algorithm
6 pages,6 figures,3 tables, conference paper
null
null
null
cs.NE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Data clustering is a recognized data analysis method in data mining whereas K-Means is the well known partitional clustering method, possessing pleasant features. We observed that, K-Means and other partitional clustering techniques suffer from several limitations such as initial cluster centre selection, preknowledge of number of clusters, dead unit problem, multiple cluster membership and premature convergence to local optima. Several optimization methods are proposed in the literature in order to solve clustering limitations, but Swarm Intelligence (SI) has achieved its remarkable position in the concerned area. Particle Swarm Optimization (PSO) is the most popular SI technique and one of the favorite areas of researchers. In this paper, we present a brief overview of PSO and applicability of its variants to solve clustering challenges. Also, we propose an advanced PSO algorithm named as Subtractive Clustering based Boundary Restricted Adaptive Particle Swarm Optimization (SC-BR-APSO) algorithm for clustering multidimensional data. For comparison purpose, we have studied and analyzed various algorithms such as K-Means, PSO, K-Means-PSO, Hybrid Subtractive + PSO, BRAPSO, and proposed algorithm on nine different datasets. The motivation behind proposing SC-BR-APSO algorithm is to deal with multidimensional data clustering, with minimum error rate and maximum convergence rate.
[ { "created": "Wed, 26 Feb 2014 06:08:27 GMT", "version": "v1" } ]
2014-02-27
[ [ "Ghorpade-Aher", "Jayshree", "" ], [ "Metre", "Vishakha A.", "" ] ]
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