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1401.7290
Kenta Kasai
Koji Tazoe, Kenta Kasai and Kohichi Sakaniwa
Non-Binary LDPC Codes with Large Alphabet Size
null
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study LDPC codes for the channel with input ${x}\in \mathbb{F}_q^m$ and output ${y}={x}+{z}\in \mathbb{F}_q^m$. The aim of this paper is to evaluate decoding performance of $q^m$-ary non-binary LDPC codes for large $m$. We give density evolution and decoding performance evaluation for regular non-binary LDPC codes and spatially-coupled (SC) codes. We show the regular codes do not achieve the capacity of the channel while SC codes do.
[ { "created": "Tue, 28 Jan 2014 18:26:56 GMT", "version": "v1" } ]
2014-01-29
[ [ "Tazoe", "Koji", "" ], [ "Kasai", "Kenta", "" ], [ "Sakaniwa", "Kohichi", "" ] ]
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1401.7293
Lele Wang
Lele Wang and Eren Sasoglu
Polar coding for interference networks
Shorter version submitted to ISIT 2014
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A polar coding scheme for interference networks is introduced. The scheme combines Arikan's monotone chain rules for multiple-access channels and a method by Hassani and Urbanke to 'align' two incompatible polarization processes. It achieves the Han--Kobayashi inner bound for two-user interference channels and generalizes to interference networks.
[ { "created": "Tue, 28 Jan 2014 18:46:35 GMT", "version": "v1" } ]
2014-01-29
[ [ "Wang", "Lele", "" ], [ "Sasoglu", "Eren", "" ] ]
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1401.7294
Dmitry Kolomenskiy
Dmitry Kolomenskiy, Jean-Christophe Nave and Kai Schneider
Adaptive gradient-augmented level set method with multiresolution error estimation
null
null
10.1007/s10915-015-0014-7
null
physics.comp-ph cs.NA math.NA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A space-time adaptive scheme is presented for solving advection equations in two space dimensions. The gradient-augmented level set method using a semi-Lagrangian formulation with backward time integration is coupled with a point value multiresolution analysis using Hermite interpolation. Thus locally refined dyadic spatial grids are introduced which are efficiently implemented with dynamic quadtree data structures. For adaptive time integration, an embedded Runge-Kutta method is employed. The precision of the new fully adaptive method is analysed and speed up of CPU time and memory compression with respect to the uniform grid discretization are reported.
[ { "created": "Tue, 28 Jan 2014 18:51:52 GMT", "version": "v1" }, { "created": "Tue, 29 Jul 2014 15:52:41 GMT", "version": "v2" }, { "created": "Thu, 19 Mar 2015 19:40:16 GMT", "version": "v3" } ]
2015-04-20
[ [ "Kolomenskiy", "Dmitry", "" ], [ "Nave", "Jean-Christophe", "" ], [ "Schneider", "Kai", "" ] ]
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null
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1401.7304
Rishab Nithyanand
Rishab Nithyanand, Jonathan Toohill, Rob Johnson
How Best to Handle a Dicey Situation
null
null
null
null
cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We introduce the {Destructive Object Handling} (DOH) problem, which models aspects of many real-world allocation problems, such as shipping explosive munitions, scheduling processes in a cluster with fragile nodes, re-using passwords across multiple websites, and quarantining patients during a disease outbreak. In these problems, objects must be assigned to handlers, but each object has a probability of destroying itself and all the other objects allocated to the same handler. The goal is to maximize the expected value of the objects handled successfully. We show that finding the optimal allocation is $\mathsf{NP}$-$\mathsf{complete}$, even if all the handlers are identical. We present an FPTAS when the number of handlers is constant. We note in passing that the same technique also yields a first FPTAS for the weapons-target allocation problem \cite{manne_wta} with a constant number of targets. We study the structure of DOH problems and find that they have a sort of phase transition -- in some instances it is better to spread risk evenly among the handlers, in others, one handler should be used as a ``sacrificial lamb''. We show that the problem is solvable in polynomial time if the destruction probabilities depend only on the handler to which an object is assigned; if all the handlers are identical and the objects all have the same value; or if each handler can be assigned at most one object. Finally, we empirically evaluate several heuristics based on a combination of greedy and genetic algorithms. The proposed heuristics return fairly high quality solutions to very large problem instances (upto 250 objects and 100 handlers) in tens of seconds.
[ { "created": "Tue, 28 Jan 2014 19:31:57 GMT", "version": "v1" } ]
2014-01-29
[ [ "Nithyanand", "Rishab", "" ], [ "Toohill", "Jonathan", "" ], [ "Johnson", "Rob", "" ] ]
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1401.7305
Denis Gagnon
Denis Gagnon, Joey Dumont, Jean-Luc D\'eziel, Louis J. Dub\'e
Ab initio investigation of lasing thresholds in photonic molecules
null
JOSA B, Vol. 31, Issue 8, pp. 1867-1873 (2014)
10.1364/JOSAB.31.001867
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We investigate lasing thresholds in a representative photonic molecule composed of two coupled active cylinders of slightly different radii. Specifically, we use the recently formulated steady-state ab initio laser theory (SALT) to assess the effect of the underlying gain transition on lasing frequencies and thresholds. We find that the order in which modes lase can be modified by choosing suitable combinations of the gain center frequency and linewidth, a result that cannot be obtained using the conventional approach of quasi-bound modes. The impact of the gain transition center on the lasing frequencies, the frequency pulling effect, is also quantified.
[ { "created": "Tue, 28 Jan 2014 19:46:20 GMT", "version": "v1" }, { "created": "Thu, 19 Jun 2014 20:01:33 GMT", "version": "v2" } ]
2014-07-18
[ [ "Gagnon", "Denis", "" ], [ "Dumont", "Joey", "" ], [ "Déziel", "Jean-Luc", "" ], [ "Dubé", "Louis J.", "" ] ]
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1401.7310
Mohammad Sami
M. Sami
Why is Universe so dark ?
16 pages and 7 figures, expanded version of Vaidya-Roychoudhury endowment award lecture delivered at Shree Shivaji Science College, Nagpur
New Advances in Physics, Vol 10, June 2016, pp.77-105
null
null
physics.pop-ph astro-ph.CO gr-qc
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this presentation prepared for a general audience, we briefly mention the shortcomings of standard model of universe. We then focus on the late time inconsistency of the model dubbed age crisis whose resolution requires the presence of a repulsive effect that could be sourced either by dark energy or by a large scale modification of gravity. By and large, our description is based upon Newtonian cosmology which is simple and elegant despite of its limitations. On heuristic grounds, we explain how a tiny mass of graviton could account for late time cosmic acceleration. We also include a brief discussion on the underlying physics of Type Ia supernovae explosion and the direct confirmation of late time acceleration of Universe by the related observations.
[ { "created": "Mon, 6 Jan 2014 11:37:32 GMT", "version": "v1" } ]
2016-07-12
[ [ "Sami", "M.", "" ] ]
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1401.7313
Alexander Russell
Sixia Chen, Alexander Russell, Abhishek Samanta, Ravi Sundaram
Deterministic Blind Rendezvous in Cognitive Radio Networks
null
null
null
null
cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Blind rendezvous is a fundamental problem in cognitive radio networks. The problem involves a collection of agents (radios) that wish to discover each other in the blind setting where there is no shared infrastructure and they initially have no knowledge of each other. Time is divided into discrete slots; spectrum is divided into discrete channels, $\{1,2,..., n\}$. Each agent may access a single channel in a single time slot and we say that two agents rendezvous when they access the same channel in the same time slot. The model is asymmetric: each agent $A_i$ may only use a particular subset $S_i$ of the channels and different agents may have access to different subsets of channels. The goal is to design deterministic channel hopping schedules for each agent so as to guarantee rendezvous between any pair of agents with overlapping channel sets. Two independent sets of authors, Shin et al. and Lin et al., gave the first constructions guaranteeing asynchronous blind rendezvous in $O(n^2)$ and $O(n^3)$ time, respectively. We present a substantially improved construction guaranteeing that any two agents, $A_i$, $A_j$, will rendezvous in $O(|S_i| |S_j| \log\log n)$ time. Our results are the first that achieve nontrivial dependence on $|S_i|$, the size of the set of available channels. This allows us, for example, to save roughly a quadratic factor over the best previous results in the important case when channel subsets have constant size. We also achieve the best possible bound of $O(1)$ time for the symmetric situation; previous works could do no better than $O(n)$. Using the probabilistic method and Ramsey theory we provide evidence in support of our suspicion that our construction is asymptotically optimal for small size channel subsets: we show both a $c |S_i||S_j|$ lower bound and a $c \log\log n$ lower bound when $|S_i|, |S_j| \leq n/2$.
[ { "created": "Tue, 28 Jan 2014 20:13:03 GMT", "version": "v1" } ]
2014-01-29
[ [ "Chen", "Sixia", "" ], [ "Russell", "Alexander", "" ], [ "Samanta", "Abhishek", "" ], [ "Sundaram", "Ravi", "" ] ]
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1401.7324
Pengfei Bao
Pengfei Bao, Chengjian Lin, Feng Yang, Zhaoqiao Guo, Tianshu Guo, Lei Yang, Lijie Sun, Huiming Jia, Xinxing Xu, Nanru Ma, Huanqiao Zhang and Zuhua Liu
Development of large-area quadrant silicon detector for charged particles
null
null
10.1088/1674-1137/38/12/126001
null
physics.ins-det nucl-ex
http://creativecommons.org/licenses/by-nc-sa/3.0/
The quadrant silicon detector, a kind of passivated implanted planar silicon detector with quadrant structure on the junction side, gained its wide application in charged particle detection. In this paper, the manufacturing procedure, performance test and results of the quadrant silicon detector developed recently at the China Institute of Atomic Energy are presented. The detector is about 300 $\mu$m thick with a 48$\times$48 mm$^{2}$ active area. The leakage current under full depletion bias voltage of -16 V is about 2.5 nA, and the raising time is better than 160 ns. The energy resolution for 5.157 MeV $\alpha$-particle is around the level of $1\%$. Charge sharing effects between the neighboring quads, leading to complicated correlations between two quads, were observed when $\alpha$ particles illuminated on the junction side. It is explained as a result of distortion of electric field of inter-quad region. Such events is only about $0.6\%$ of all events and can be neglected in an actual application.
[ { "created": "Tue, 28 Jan 2014 04:54:26 GMT", "version": "v1" } ]
2015-06-18
[ [ "Bao", "Pengfei", "" ], [ "Lin", "Chengjian", "" ], [ "Yang", "Feng", "" ], [ "Guo", "Zhaoqiao", "" ], [ "Guo", "Tianshu", "" ], [ "Yang", "Lei", "" ], [ "Sun", "Lijie", "" ], [ "Jia", "Huiming", "" ], [ "Xu", "Xinxing", "" ], [ "Ma", "Nanru", "" ], [ "Zhang", "Huanqiao", "" ], [ "Liu", "Zuhua", "" ] ]
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1401.7344
Brian Hanley
Brian P. Hanley
Release of the Kraken: A Novel Money Multiplier Equation's Debut in 21st Century Banking
22 pages, 3 figures, 5 significant equations (of 7). Published in Economics E-Journal
Economics: The Open-Access, Open-Assessment E-Journal, Vol. 6, 2012-3
10.5018/economics-ejournal.ja.2012-3
null
q-fin.GN cs.CE
http://creativecommons.org/licenses/by/3.0/
Historically, the banking multiplier has been in a range of 4 to 100, with 25% to 1% reserve ratios at most layers of the banking system encompassing the majority of its range in recent centuries. Here it is shown that multipliers over 1 000 can occur from a new mechanism in banking. This new multiplier uses a default insurance note to insure an outstanding loan in order to return the value of the insured amount into capital. The economic impact of this invention is calculably greater than the original invention of reserve banking. The consequence of this lending invention is to render the existing money multiplier equations of reserve banking obsolete where it occurs. The equations describing this new multiplier do not converge. Each set of parameters for reserve percentage, nesting depth, etc. creates a unique logarithmic curve rather than approaching a limit. Thus it is necessary to show the behavior of this new equation by numerical methods. Understanding this new multiplier and associated issues is necessary for economic analyses of the Global Financial Crisis.
[ { "created": "Sat, 25 Jan 2014 19:39:14 GMT", "version": "v1" } ]
2014-01-30
[ [ "Hanley", "Brian P.", "" ] ]
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1401.7345
Masud Mansuripur
Masud Mansuripur
Radiation Pressure on Submerged Mirrors: Implications for the Momentum of Light in Dielectric Media
6 pages, 3 figures, 10 equations, 11 references
Published in Optics Express, Vol. 15, No. 5, pp 2677-2682 (2007)
10.1364/OE.15.002677
null
physics.optics physics.class-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Radiation pressure measurements on mirrors submerged in dielectric liquids have consistently shown an effective Minkowski momentum for the photons within the liquid. Using an exact theoretical calculation based on Maxwell's equations and the Lorentz law of force, we demonstrate that this result is a consequence of the fact that conventional mirrors impart, upon reflection, a 180 degree phase-shift to the incident beam of light. If the mirror is designed to impart a different phase, then the effective momentum will turn out to be anywhere between the two extremes of the Minkowski and Abraham momenta. Since all values in the range between these two extremes are equally likely to be found in experiments, we argue that the photon momentum inside a dielectric host has the arithmetic mean value of the Abraham and Minkowski momenta.
[ { "created": "Tue, 28 Jan 2014 21:21:21 GMT", "version": "v1" } ]
2014-01-30
[ [ "Mansuripur", "Masud", "" ] ]
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1401.7347
Alberto Amo
A. Amo, J. Bloch, A. Bramati, I. Carusotto, C. Ciuti, B. Deveaud-Pl\'edran, E. Giacobino, G. Grosso, A. Kamchatnov, G. Malpuech, N. Pavloff, S. Pigeon, D. Sanvitto, D. D. Solnyshkov
Comment on "Linear wave dynamics explains observations attributed to dark-solitons in a polariton quantum fluid"
4 pages, 2 figures
Phys. Rev. Lett. 115, 089401 (2015)
10.1103/PhysRevLett.115.089401
null
physics.optics cond-mat.quant-gas
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In a recent preprint (arXiv:1401.1128v1) Cilibrizzi and co-workers report experiments and simulations showing the scattering of polaritons against a localised obstacle in a semiconductor microcavity. The authors observe in the linear excitation regime the formation of density and phase patterns reminiscent of those expected in the non-linear regime from the nucleation of dark solitons. Based on this observation, they conclude that previous theoretical and experimental reports on dark solitons in a polariton system should be revised. Here we comment why the results from Cilibrizzi et al. take place in a very different regime than previous investigations on dark soliton nucleation and do not reproduce all the signatures of its rich nonlinear phenomenology. First of all, Cilibrizzi et al. consider a particular type of radial excitation that strongly determines the observed patterns, while in previous reports the excitation has a plane-wave profile. Most importantly, the nonlinear relation between phase jump, soliton width and fluid velocity, and the existence of a critical velocity with the time-dependent formation of vortex-antivortex pairs are absent in the linear regime. In previous reports about dark soliton and half-dark soliton nucleation in a polariton fluid, the distinctive dark soliton physics is supported both by theory (analytical and numerical) and experiments (both continuous wave and pulsed excitation).
[ { "created": "Tue, 28 Jan 2014 21:39:42 GMT", "version": "v1" } ]
2015-08-26
[ [ "Amo", "A.", "" ], [ "Bloch", "J.", "" ], [ "Bramati", "A.", "" ], [ "Carusotto", "I.", "" ], [ "Ciuti", "C.", "" ], [ "Deveaud-Plédran", "B.", "" ], [ "Giacobino", "E.", "" ], [ "Grosso", "G.", "" ], [ "Kamchatnov", "A.", "" ], [ "Malpuech", "G.", "" ], [ "Pavloff", "N.", "" ], [ "Pigeon", "S.", "" ], [ "Sanvitto", "D.", "" ], [ "Solnyshkov", "D. D.", "" ] ]
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1401.7353
Kenan Qu
Kenan Qu and G. S. Agarwal
Strong squeezing via phonon mediated spontaneous generation of photon pairs
null
2014 New J. Phys. 16 113004
10.1088/1367-2630/16/11/113004
null
quant-ph physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose a scheme generating robust squeezed light by using double cavity optomechanical system driven by a blue detuned laser in one cavity and by a red detuned laser in the other. This double cavity system is shown to mimic effectively an interaction that is similar to the one for the downconverter, which is known to be a source of strong squeezing for the light fields. There are however distinctions as the phonons, which lead to such an interaction, can contribute to the quantum noise. We show that the squeezing of the output fields in the order of $10$dB can be achieved even at the mirror temperature at the order of $10$mK.
[ { "created": "Tue, 28 Jan 2014 22:11:54 GMT", "version": "v1" }, { "created": "Tue, 25 Mar 2014 20:31:00 GMT", "version": "v2" } ]
2014-11-14
[ [ "Qu", "Kenan", "" ], [ "Agarwal", "G. S.", "" ] ]
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1401.7360
Eun Jee Lee
Eun Jee Lee and Emmanuel Abbe
A Shannon Approach to Secure Multi-party Computations
null
52nd Annual Allerton Conference on. IEEE (2014) 1287-1293
10.1109/ALLERTON.2014.7028604
null
cs.IT cs.CR math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In secure multi-party computations (SMC), parties wish to compute a function on their private data without revealing more information about their data than what the function reveals. In this paper, we investigate two Shannon-type questions on this problem. We first consider the traditional one-shot model for SMC which does not assume a probabilistic prior on the data. In this model, private communication and randomness are the key enablers to secure computing, and we investigate a notion of randomness cost and capacity. We then move to a probabilistic model for the data, and propose a Shannon model for discrete memoryless SMC. In this model, correlations among data are the key enablers for secure computing, and we investigate a notion of dependency which permits the secure computation of a function. While the models and questions are general, this paper focuses on summation functions, and relies on polar code constructions.
[ { "created": "Tue, 28 Jan 2014 22:43:57 GMT", "version": "v1" }, { "created": "Thu, 13 Feb 2014 02:13:18 GMT", "version": "v2" }, { "created": "Wed, 26 Mar 2014 04:07:06 GMT", "version": "v3" } ]
2017-05-25
[ [ "Lee", "Eun Jee", "" ], [ "Abbe", "Emmanuel", "" ] ]
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1401.7361
Leonardo Gordillo
Leonardo Gordillo and Nicol\'as Mujica
Measurement of velocity field in parametrically excited solitary waves
10 pages, 4 figures, JFM published
J. Fluid Mech. 754 (2014), 590-604
10.1017/jfm.2014.416
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Parametrically excited solitary waves emerge as localized structures in high-aspect-ratio free surfaces subject to vertical vibrations. Herein, we provide the first experimental characterization of the hydrodynamics of these waves using Particle Image Velocimetry. We show that the underlying velocity field of parametrically excited solitary waves is mainly composed by an oscillatory velocity field. Our results confirm the accuracy of Hamiltonian models with added dissipation in describing this field. Remarkably, our measurements also uncover the onset of a streaming velocity field which is shown to be as important as other crucial nonlinear terms in the current theory. The observed streaming pattern is particularly interesting due to the presence of oscillatory meniscii.
[ { "created": "Tue, 28 Jan 2014 22:46:17 GMT", "version": "v1" }, { "created": "Mon, 3 Feb 2014 19:59:50 GMT", "version": "v2" }, { "created": "Sat, 23 Aug 2014 11:38:04 GMT", "version": "v3" } ]
2014-08-26
[ [ "Gordillo", "Leonardo", "" ], [ "Mujica", "Nicolás", "" ] ]
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1401.7362
Istvan Kezsmarki
M. Puk\'ancsik, A. Orb\'an, K. Matsuo, K. Gekko, D. Hart, I. K\'ezsm\'arki and B. G. V\'ertessy
Secondary structure prediction of protein constructs using random incremental truncation and vacuum-ultraviolet CD spectroscopy
null
null
null
null
physics.bio-ph q-bio.BM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A novel uracil-DNA degrading protein factor (termed UDE) was identified in Drosophila melanogaster with no significant structural and functional homology to other uracil-DNA binding or processing factors. Determination of the 3D structure of UDE will be a true breakthrough in description of the molecular mechanism of action of UDE catalysis, as well as in general uracil-recognition and nuclease action. The revolutionary ESPRIT technology was applied to the novel protein UDE to overcome problems in identifying soluble expressing constructs given the absence of precise information on domain content and arrangement. Nine specimen from the created numerous truncated constructs of UDE were choosen to dechiper structural and functional relationships. VUVCD with neural network was performed to define the secondary structure content and location of UDE and its truncated variants. The quantitative analysis demonstrated exclusive {\alpha}-helical content for the full-length protein, which is preserved in the truncated constructs. Partition of {\alpha}-helical boundles comparison with the truncated protein segments denoted new domain boundaries which differ from the conserved motifs determined by sequence-based alignment of UDE homologues in pupating insects. Here we demonstrate that combination of ESPRIT and VUVCD with NN provided significant structural description of UDE and resulted useful truncated constructs for further detailed functional studies.
[ { "created": "Tue, 28 Jan 2014 22:47:00 GMT", "version": "v1" } ]
2014-01-30
[ [ "Pukáncsik", "M.", "" ], [ "Orbán", "A.", "" ], [ "Matsuo", "K.", "" ], [ "Gekko", "K.", "" ], [ "Hart", "D.", "" ], [ "Kézsmárki", "I.", "" ], [ "Vértessy", "B. G.", "" ] ]
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1401.7363
Paul Boynton
P. Boynton, A. V. Balatsky, I. K. Schuller, M. Di Ventra
Improving sequencing by tunneling with multiplexing and cross-correlations
8 pages, 4 figures
Journal of Computational Electronics 13 (2014) 794-800
10.1007/s10825-014-0571-2
null
cond-mat.soft physics.bio-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Sequencing by tunneling is a next-generation approach to read single-base information using electronic tunneling transverse to the single-stranded DNA (ssDNA) backbone while the latter is translocated through a narrow channel. The original idea considered a single pair of electrodes to read out the current and distinguish the bases [1, 2]. Here, we propose an improvement to the original sequencing by tunneling method, in which $N$ pairs of electrodes are built in series along a synthetic nanochannel. While the ssDNA is forced through the channel using a longitudinal field it passes by each pair of electrodes for long enough time to gather a minimum of $m$ tunneling current measurements, where $m$ is determined by the level of sequencing error desired. Each current time series for each nucleobase is then cross-correlated together, from which the DNA bases can be distinguished. We show using random sampling of data from classical molecular dynamics, that indeed the sequencing error is significantly reduced as the number of pairs of electrodes, $N$, increases. Compared to the sequencing ability of a single pair of electrodes, cross-correlating $N$ pairs of electrodes is exponentially better due to the approximate log-normal nature of the tunneling current probability distributions. We have also used the Fenton-Wilkinson approximation to analytically describe the mean and variance of the cross-correlations that are used to distinguish the DNA bases. The method we suggest is particularly useful when the measurement bandwidth is limited, allowing a smaller electrode gap residence time while still promising to consistently identify the DNA bases correctly.
[ { "created": "Tue, 28 Jan 2014 22:53:58 GMT", "version": "v1" }, { "created": "Tue, 22 Sep 2015 00:40:52 GMT", "version": "v2" } ]
2015-09-23
[ [ "Boynton", "P.", "" ], [ "Balatsky", "A. V.", "" ], [ "Schuller", "I. K.", "" ], [ "Di Ventra", "M.", "" ] ]
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1401.7364
Alessandra Gatti
Alessandra Gatti, Lucia Caspani, Tommaso Corti, Enrico Brambilla, Ottavia Jedrkiewicz
Spatio-temporal entanglement of twin photons: an intuitive picture
12 pages, 3 figures
International Journal of Quantum Information 1461016 , 12 (2014)
10.1142/S0219749914610164
null
quant-ph physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We draw an intuitive picture of the spatio-temporal properties of the entangled state of twin photons, where they are described as classical wave-packets. This picture predicts a precise relation between their temporal and transverse spatial separations at the crystal output. The space-time coupling described by classical arguments turns out to determine in a precise way the spatio-temporal structure of the quantum entanglement, analysed by means of the biphotonic correlation and of the Schmidt dimensionality of the entanglement.
[ { "created": "Tue, 28 Jan 2014 23:04:39 GMT", "version": "v1" } ]
2014-05-29
[ [ "Gatti", "Alessandra", "" ], [ "Caspani", "Lucia", "" ], [ "Corti", "Tommaso", "" ], [ "Brambilla", "Enrico", "" ], [ "Jedrkiewicz", "Ottavia", "" ] ]
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1401.7368
Jonathan Katz
T. Muschinski and J. I. Katz
Historic Trends in U. S. Drought Forcing in a Warming Climate
11 pages, 2 figures
null
null
null
physics.ao-ph physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The mean North American and world climates have warmed significantly since the beginning of climatologically significant anthropogenic emission of greenhouse gases in the 19th Century. It has been suggested that warming may increase the frequency or severity of droughts. We define and study the statistics of an aridity index that describes the precipitation forcing function of a drought, considering drought to be a season with low enough precipitation to be significant for agriculture. Our aridity index is a reciprocal function of the seasonal precipitation, which is more significant for agriculture than mean precipitation. Using NOAA data from sites in 13 diverse climate regimes in the 48 contiguous United States with time series running over the period 1940--1999 but including two data series from 1900 or 1910, and computing their decadal averages, we search for linear trends in their aridity indices. We find no linear trends significant at the $2\sigma$ level. At five sites $3\sigma$ upper bounds on any systematic trends are in the range 1.0--2.8%/decade, while at two sites $3\sigma$ lower bounds are -0.5%/decade and -2.2%/decade; at other sites the bounds are less restrictive.
[ { "created": "Tue, 28 Jan 2014 23:27:08 GMT", "version": "v1" } ]
2014-06-03
[ [ "Muschinski", "T.", "" ], [ "Katz", "J. I.", "" ] ]
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1401.7369
Lawrence Ong
Lawrence Ong
Linear Codes are Optimal for Index-Coding Instances with Five or Fewer Receivers
submitted to the 2014 IEEE International Symposium on Information Theory (ISIT)
Proceedings of the 2014 IEEE International Symposium on Information Theory (ISIT 2014), Honolulu, USA, pp. 491-495, June 29-July 4, 2014
10.1109/ISIT.2014.6874881
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study zero-error unicast index-coding instances, where each receiver must perfectly decode its requested message set, and the message sets requested by any two receivers do not overlap. We show that for all these instances with up to five receivers, linear index codes are optimal. Although this class contains 9847 non-isomorphic instances, by using our recent results and by properly categorizing the instances based on their graphical representations, we need to consider only 13 non-trivial instances to solve the entire class. This work complements the result by Arbabjolfaei et al. (ISIT 2013), who derived the capacity region of all unicast index-coding problems with up to five receivers in the diminishing-error setup. They employed random-coding arguments, which require infinitely-long messages. We consider the zero-error setup; our approach uses graph theory and combinatorics, and does not require long messages.
[ { "created": "Tue, 28 Jan 2014 23:30:56 GMT", "version": "v1" } ]
2014-09-04
[ [ "Ong", "Lawrence", "" ] ]
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1401.7372
Jeroen Ooms
Dirk Eddelbuettel, Murray Stokely, Jeroen Ooms
RProtoBuf: Efficient Cross-Language Data Serialization in R
null
null
10.18637/jss.v071.i02
null
stat.CO cs.MS cs.SE
http://creativecommons.org/licenses/by/3.0/
Modern data collection and analysis pipelines often involve a sophisticated mix of applications written in general purpose and specialized programming languages. Many formats commonly used to import and export data between different programs or systems, such as CSV or JSON, are verbose, inefficient, not type-safe, or tied to a specific programming language. Protocol Buffers are a popular method of serializing structured data between applications - while remaining independent of programming languages or operating systems. They offer a unique combination of features, performance, and maturity that seems particularly well suited for data-driven applications and numerical computing. The RProtoBuf package provides a complete interface to Protocol Buffers from the R environment for statistical computing. This paper outlines the general class of data serialization requirements for statistical computing, describes the implementation of the RProtoBuf package, and illustrates its use with example applications in large-scale data collection pipelines and web services.
[ { "created": "Tue, 28 Jan 2014 23:57:02 GMT", "version": "v1" } ]
2016-07-27
[ [ "Eddelbuettel", "Dirk", "" ], [ "Stokely", "Murray", "" ], [ "Ooms", "Jeroen", "" ] ]
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1401.7374
Zhiyi Zhou
Zhiyi Zhou, Dongning Guo, Michael L. Honig
A Message-Passing Approach to Combating Hidden Terminals in Wireless Networks
12 pages. arXiv admin note: text overlap with arXiv:0901.1408
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null
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cs.NI cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Collisions with hidden terminals is a major cause of performance degradation in 802.11 and likewise wireless networks. Carrier sense multiple access with collision avoidance (CSMA/CA) is utilized to avoid collisions at the cost of spatial reuse. This report studies receiver design to mitigate interference from hidden terminals. A wireless channel model with correlated fading in time is assumed. A message-passing approach is proposed, in which a receiver can successfully receive and decode partially overlapping transmissions from two sources rather than treating undesired one as thermal noise. Numerical results of both coded and uncoded systems show the advantage of the receiver over conventional receivers.
[ { "created": "Wed, 29 Jan 2014 00:09:28 GMT", "version": "v1" } ]
2014-01-30
[ [ "Zhou", "Zhiyi", "" ], [ "Guo", "Dongning", "" ], [ "Honig", "Michael L.", "" ] ]
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1401.7375
Jaewon Yang
Jaewon Yang, Julian McAuley, Jure Leskovec
Detecting Cohesive and 2-mode Communities in Directed and Undirected Networks
Published in the proceedings of WSDM '14
null
null
null
cs.SI physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Networks are a general language for representing relational information among objects. An effective way to model, reason about, and summarize networks, is to discover sets of nodes with common connectivity patterns. Such sets are commonly referred to as network communities. Research on network community detection has predominantly focused on identifying communities of densely connected nodes in undirected networks. In this paper we develop a novel overlapping community detection method that scales to networks of millions of nodes and edges and advances research along two dimensions: the connectivity structure of communities, and the use of edge directedness for community detection. First, we extend traditional definitions of network communities by building on the observation that nodes can be densely interlinked in two different ways: In cohesive communities nodes link to each other, while in 2-mode communities nodes link in a bipartite fashion, where links predominate between the two partitions rather than inside them. Our method successfully detects both 2-mode as well as cohesive communities, that may also overlap or be hierarchically nested. Second, while most existing community detection methods treat directed edges as though they were undirected, our method accounts for edge directions and is able to identify novel and meaningful community structures in both directed and undirected networks, using data from social, biological, and ecological domains.
[ { "created": "Wed, 29 Jan 2014 00:19:02 GMT", "version": "v1" } ]
2014-01-30
[ [ "Yang", "Jaewon", "" ], [ "McAuley", "Julian", "" ], [ "Leskovec", "Jure", "" ] ]
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1401.7376
Blas Manuel Rodr\'iguez-Lara
B. M. Rodr\'iguez-Lara
An intensity-dependent quantum Rabi model: Spectrum, SUSY partner and optical simulation
9 pages, 2 figures
J. Opt. Soc. Am B 31, 1719 - 1722 (2014)
10.1364/JOSAB.31.001719
null
quant-ph physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study an intensity-dependent quantum Rabi model that can be written in terms of SU(1,1) group elements and is related to the Buck-Sukumar model for the Bargmann parameter $k=1/2$. The spectrum seems to present avoiding crossings for all valid parameter sets and, thus, may be integrable. For a degenerate qubit, the model is soluble and we construct an unbroken supersymmetric parter for it. We discuss the classical simulation of the general model in photonic lattices and show that it presents quasi-periodic reconstruction for a given initial state and parameter set.
[ { "created": "Wed, 29 Jan 2014 00:27:11 GMT", "version": "v1" } ]
2014-10-10
[ [ "Rodríguez-Lara", "B. M.", "" ] ]
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1401.7377
Rajeev Nongpiur
R. C. Nongpiur
Improved Robust Node Position Estimation in Wireless Sensor Networks
null
null
null
null
cs.NI cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A new method for estimating the relative positions of location-unaware nodes from the location-aware nodes and the received signal strength (RSS) between the nodes, in a wireless sensor network (WSN), is proposed. In the method, a regularization term is incorporated in the optimization problem leading to significant improvement in the estimation accuracy even in the presence of position errors of the location-aware nodes and distance errors between the nodes. The regularization term is appropriated weighted on the basis of the degree of connectivity between the nodes in the network. The method is formulated as a convex optimization problem using the semidefinite relaxation approach. Experimental comparisons with state-of-the-art competing methods show that the proposed method yields node positions that are much more accurate even in the presence of measurement errors.
[ { "created": "Wed, 29 Jan 2014 00:31:55 GMT", "version": "v1" }, { "created": "Sun, 9 Feb 2014 01:01:37 GMT", "version": "v2" } ]
2014-02-11
[ [ "Nongpiur", "R. C.", "" ] ]
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1401.7387
Yi Fan
Yi Fan, Conor P. Schlick, Paul B. Umbanhowar, Julio M. Ottino, and Richard M. Lueptow
Modeling size segregation of granular materials: the roles of segregation, advection and diffusion
Accepted for publication in the Journal of Fluid Mechanics
Journal of Fluid Mechanics, vol 741, pp 252-279, 2014
10.1017/jfm.2013.680
null
physics.flu-dyn cond-mat.soft
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Predicting segregation of granular materials composed of different-sized particles is a challenging problem. In this paper, we develop and implement a theoretical model that captures the interplay between advection, segregation, and diffusion in size bidisperse granular materials. The fluxes associated with these three driving factors depend on the underlying kinematics, whose characteristics play key roles in determining particle segregation configurations. Unlike previous models for segregation, our model uses parameters based on kinematic measures from discrete element method simulations instead of arbitrarily adjustable fitting parameters, and it achieves excellent quantitative agreement with both experimental and simulation results when applied to quasi-two-dimensional bounded heaps. The model yields two dimensionless control parameters, both of which are only functions of physically control parameters (feed rate, particle sizes, and system size) and kinematic parameters (diffusion coefficient, flowing layer depth, and percolation velocity). The P\'eclet number, $Pe$, captures the interplay of advection and diffusion, and the second dimensionless parameter, $\Lambda$, describes the interplay between segregation and advection. A parametric study of $\Lambda$ and $Pe$ demonstrates how the particle segregation configuration depends on the interplay of advection, segregation, and diffusion. The model can be readily adapted to other flow geometries.
[ { "created": "Wed, 29 Jan 2014 02:05:45 GMT", "version": "v1" } ]
2014-03-07
[ [ "Fan", "Yi", "" ], [ "Schlick", "Conor P.", "" ], [ "Umbanhowar", "Paul B.", "" ], [ "Ottino", "Julio M.", "" ], [ "Lueptow", "Richard M.", "" ] ]
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1401.7388
Benjamin Rubinstein
J. Hyam Rubinstein and Benjamin I. P. Rubinstein and Peter L. Bartlett
Bounding Embeddings of VC Classes into Maximum Classes
22 pages, 2 figures
null
null
null
cs.LG math.CO stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
One of the earliest conjectures in computational learning theory-the Sample Compression conjecture-asserts that concept classes (equivalently set systems) admit compression schemes of size linear in their VC dimension. To-date this statement is known to be true for maximum classes---those that possess maximum cardinality for their VC dimension. The most promising approach to positively resolving the conjecture is by embedding general VC classes into maximum classes without super-linear increase to their VC dimensions, as such embeddings would extend the known compression schemes to all VC classes. We show that maximum classes can be characterised by a local-connectivity property of the graph obtained by viewing the class as a cubical complex. This geometric characterisation of maximum VC classes is applied to prove a negative embedding result which demonstrates VC-d classes that cannot be embedded in any maximum class of VC dimension lower than 2d. On the other hand, we show that every VC-d class C embeds in a VC-(d+D) maximum class where D is the deficiency of C, i.e., the difference between the cardinalities of a maximum VC-d class and of C. For VC-2 classes in binary n-cubes for 4 <= n <= 6, we give best possible results on embedding into maximum classes. For some special classes of Boolean functions, relationships with maximum classes are investigated. Finally we give a general recursive procedure for embedding VC-d classes into VC-(d+k) maximum classes for smallest k.
[ { "created": "Wed, 29 Jan 2014 02:09:10 GMT", "version": "v1" } ]
2014-02-04
[ [ "Rubinstein", "J. Hyam", "" ], [ "Rubinstein", "Benjamin I. P.", "" ], [ "Bartlett", "Peter L.", "" ] ]
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1401.7396
Alexander Chesnokov
Alexander A. Chesnokov, Maxim V. Pavlov
Propagation of nonlinear waves in a rarefied bubbly flow
null
null
null
null
nlin.SI physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The one-dimension Russo--Smereka kinetic equation describing the propagation of nonlinear concentration waves in a rarefied bubbly fluid is considered. Reductions of the model to finite component systems are derived. Stability of the bubbly flow in terms of hyperbolicity of the kinetic equation is studied. Conservation form of the model is proposed and numerical solution of the Cauchy problem with discontinuous initial data is obtained.
[ { "created": "Wed, 29 Jan 2014 02:47:22 GMT", "version": "v1" } ]
2016-02-08
[ [ "Chesnokov", "Alexander A.", "" ], [ "Pavlov", "Maxim V.", "" ] ]
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1401.7401
Ya Cheng Professor
Bin Zeng, Wei Chu, Guihua Li, Jinping Yao, Haisu Zhang, Jielei Ni, Chenrui Jing, Hongqiang Xie, and Ya Cheng
Real-time observation of dynamics in rotational molecular wave packets by use of "air laser" spectroscopy
23 pages, 6 figures
null
10.1103/PhysRevA.89.042508
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Molecular rotational spectroscopy based on strong-field-ionization-induced nitrogen laser is employed to investigate the time evolution of the rotational wave packet composed by a coherent superposition of quantum rotational states created in a field-free molecular alignment. We show that this technique uniquely allows real-time observation of the ultrafast dynamics of the individual rotational states in the rotational wavepacket. Our analysis also shows that there exist two channels of generation of the nitrogen laser, shedding new light on the population inversion mechanism behind the air laser generated by intense femtosecond laser pulses.
[ { "created": "Wed, 29 Jan 2014 03:15:58 GMT", "version": "v1" }, { "created": "Wed, 26 Feb 2014 08:20:26 GMT", "version": "v2" }, { "created": "Fri, 21 Mar 2014 05:57:25 GMT", "version": "v3" } ]
2015-06-18
[ [ "Zeng", "Bin", "" ], [ "Chu", "Wei", "" ], [ "Li", "Guihua", "" ], [ "Yao", "Jinping", "" ], [ "Zhang", "Haisu", "" ], [ "Ni", "Jielei", "" ], [ "Jing", "Chenrui", "" ], [ "Xie", "Hongqiang", "" ], [ "Cheng", "Ya", "" ] ]
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1401.7404
Behzad Asadi
Behzad Asadi, Lawrence Ong, and Sarah J. Johnson
On Index Coding in Noisy Broadcast Channels with Receiver Message Side Information
Authors' final version (to appear in IEEE Communications Letters)
IEEE Communications Letters, Vol. 18, No. 4, pp. 640-643, Apr. 2014
10.1109/LCOMM.2014.020414.132589
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This letter investigates the role of index coding in the capacity of AWGN broadcast channels with receiver message side information. We first show that index coding is unnecessary where there are two receivers; multiplexing coding and superposition coding are sufficient to achieve the capacity region. We next show that, for more than two receivers, multiplexing coding and superposition coding alone can be suboptimal. We give an example where these two coding schemes alone cannot achieve the capacity region, but adding index coding can. This demonstrates that, in contrast to the two-receiver case, multiplexing coding cannot fulfill the function of index coding where there are three or more receivers.
[ { "created": "Wed, 29 Jan 2014 03:34:57 GMT", "version": "v1" } ]
2014-04-29
[ [ "Asadi", "Behzad", "" ], [ "Ong", "Lawrence", "" ], [ "Johnson", "Sarah J.", "" ] ]
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1401.7406
Jeffrey Tsang
Jeffrey Tsang
The parametrized probabilistic finite-state transducer probe game player fingerprint model
17 pages, 35 figures
IEEE Transactions on Computational Intelligence and AI in Games 2(3):208-224, 2010
10.1109/TCIAIG.2010.2062512
null
cs.GT cs.NE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Fingerprinting operators generate functional signatures of game players and are useful for their automated analysis independent of representation or encoding. The theory for a fingerprinting operator which returns the length-weighted probability of a given move pair occurring from playing the investigated agent against a general parametrized probabilistic finite-state transducer (PFT) is developed, applicable to arbitrary iterated games. Results for the distinguishing power of the 1-state opponent model, uniform approximability of fingerprints of arbitrary players, analyticity and Lipschitz continuity of fingerprints for logically possible players, and equicontinuity of the fingerprints of bounded-state probabilistic transducers are derived. Algorithms for the efficient computation of special instances are given; the shortcomings of a previous model, strictly generalized here from a simple projection of the new model, are explained in terms of regularity condition violations, and the extra power and functional niceness of the new fingerprints demonstrated. The 2-state deterministic finite-state transducers (DFTs) are fingerprinted and pairwise distances computed; using this the structure of DFTs in strategy space is elucidated.
[ { "created": "Wed, 29 Jan 2014 03:41:02 GMT", "version": "v1" } ]
2014-02-13
[ [ "Tsang", "Jeffrey", "" ] ]
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1401.7411
Anirban Bandyopadhyay
Subrata Ghosh, Krishna Aswani, Surabhi Singh, Satyajit Sahu, Daisuke Fujita and Anirban Bandyopadhyay
Design and Construction of a Brain-Like Computer: A New Class of Frequency-Fractal Computing Using Wireless Communication in a Supramolecular Organic, Inorganic System
73 pages, 23 figures
Information 2014, 5, 28-100
10.3390/info5010028
null
cs.ET physics.bio-ph
http://creativecommons.org/licenses/by/3.0/
Here, we introduce a new class of computer which does not use any circuit or logic gate. In fact, no program needs to be written: it learns by itself and writes its own program to solve a problem. Godels incompleteness argument is explored here to devise an engine where an astronomically large number of IfThen arguments are allowed to grow by self assembly, based on the basic set of arguments written in the system, thus, we explore the beyond Turing path of computing but following a fundamentally different route adopted in the last half a century old non Turing adventures. Our hardware is a multilayered seed structure. If we open the largest seed, which is the final hardware, we find several computing seed structures inside, if we take any of them and open, there are several computing seeds inside. We design and synthesize the smallest seed, the entire multilayered architecture grows by itself. The electromagnetic resonance band of each seed looks similar, but the seeds of any layer shares a common region in its resonance band with inner and upper layer, hence a chain of resonance bands is formed (frequency fractal) connecting the smallest to the largest seed (hence the name invincible rhythm or Ajeya Chhandam in Sanskrit).
[ { "created": "Wed, 29 Jan 2014 04:44:08 GMT", "version": "v1" } ]
2014-01-30
[ [ "Ghosh", "Subrata", "" ], [ "Aswani", "Krishna", "" ], [ "Singh", "Surabhi", "" ], [ "Sahu", "Satyajit", "" ], [ "Fujita", "Daisuke", "" ], [ "Bandyopadhyay", "Anirban", "" ] ]
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1401.7413
Canyi Lu
Canyi Lu, Zhouchen Lin, Shuicheng Yan
Smoothed Low Rank and Sparse Matrix Recovery by Iteratively Reweighted Least Squares Minimization
IEEE Transactions on Image Processing 2015
null
10.1109/TIP.2014.2380155
null
cs.LG cs.CV stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This work presents a general framework for solving the low rank and/or sparse matrix minimization problems, which may involve multiple non-smooth terms. The Iteratively Reweighted Least Squares (IRLS) method is a fast solver, which smooths the objective function and minimizes it by alternately updating the variables and their weights. However, the traditional IRLS can only solve a sparse only or low rank only minimization problem with squared loss or an affine constraint. This work generalizes IRLS to solve joint/mixed low rank and sparse minimization problems, which are essential formulations for many tasks. As a concrete example, we solve the Schatten-$p$ norm and $\ell_{2,q}$-norm regularized Low-Rank Representation (LRR) problem by IRLS, and theoretically prove that the derived solution is a stationary point (globally optimal if $p,q\geq1$). Our convergence proof of IRLS is more general than previous one which depends on the special properties of the Schatten-$p$ norm and $\ell_{2,q}$-norm. Extensive experiments on both synthetic and real data sets demonstrate that our IRLS is much more efficient.
[ { "created": "Wed, 29 Jan 2014 05:16:52 GMT", "version": "v1" }, { "created": "Sat, 6 Dec 2014 14:20:42 GMT", "version": "v2" } ]
2015-06-18
[ [ "Lu", "Canyi", "" ], [ "Lin", "Zhouchen", "" ], [ "Yan", "Shuicheng", "" ] ]
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1401.7416
Pandiselvam Pps
Pandiselvam.P, Marimuthu.T and Lawrance.R
A Comparative Study on String Matching Algorithm of Biological Sequences
Selected For International Conference on Intelligent Computing
null
null
null
cs.DS cs.CE
http://creativecommons.org/licenses/by/3.0/
String matching algorithm plays the vital role in the Computational Biology. The functional and structural relationship of the biological sequence is determined by similarities on that sequence. For that, the researcher is supposed to aware of similarities on the biological sequences. Pursuing of similarity among biological sequences is an important research area of that can bring insight into the evolutionary and genetic relationships among the genes. In this paper, we have studied different kinds of string matching algorithms and observed their time and space complexities. For this study, we have assessed the performance of algorithms tested with biological sequences.
[ { "created": "Wed, 29 Jan 2014 05:39:11 GMT", "version": "v1" } ]
2014-01-30
[ [ "P", "Pandiselvam.", "" ], [ "T", "Marimuthu.", "" ], [ "R", "Lawrance.", "" ] ]
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1401.7419
Orit E. Raz
Orit E. Raz, Micha Sharir and J\'ozsef Solymosi
Polynomials vanishing on grids: The Elekes-R\'onyai problem revisited
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null
null
cs.CG math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we characterize real bivariate polynomials which have a small range over large Cartesian products. We show that for every constant-degree bivariate real polynomial $f$, either $|f(A,B)|=\Omega(n^{4/3})$, for every pair of finite sets $A,B\subset{\mathbb R}$, with $|A|=|B|=n$ (where the constant of proportionality depends on ${\rm deg} f$), or else $f$ must be of one of the special forms $f(u,v)=h(\varphi(u)+\psi(v))$, or $f(u,v)=h(\varphi(u)\cdot\psi(v))$, for some univariate polynomials $\varphi,\psi,h$ over ${\mathbb R}$. This significantly improves a result of Elekes and R\'onyai (2000). Our results are cast in a more general form, in which we give an upper bound for the number of zeros of $z=f(x,y)$ on a triple Cartesian product $A\times B\times C$, when the sizes $|A|$, $|B|$, $|C|$ need not be the same; the upper bound is $O(n^{11/6})$ when $|A|=|B|=|C|=n$, where the constant of proportionality depends on ${\rm deg} f$, unless $f$ has one of the aforementioned special forms. This result provides a unified tool for improving bounds in various Erd\H os-type problems in geometry and additive combinatorics. Several applications of our results to problems of these kinds are presented. For example, we show that the number of distinct distances between $n$ points lying on a constant-degree parametric algebraic curve which does not contain a line, in any dimension, is $\Omega(n^{4/3})$, extending the result of Pach and de Zeeuw (2013) and improving the bound of Charalambides (2012), for the special case where the curve under consideration has a polynomial parameterization. We also derive improved lower bounds for several variants of the sum-product problem in additive combinatorics.
[ { "created": "Wed, 29 Jan 2014 07:09:37 GMT", "version": "v1" }, { "created": "Wed, 19 Mar 2014 19:44:42 GMT", "version": "v2" } ]
2014-03-20
[ [ "Raz", "Orit E.", "" ], [ "Sharir", "Micha", "" ], [ "Solymosi", "József", "" ] ]
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1401.7423
Martin Lemoine
M. Lemoine (IAP), G. Pelletier (IPAG)
Relativistic shock acceleration and some consequences
10 pages,1 figure. To appear in the Proceedings of the HEPRO IV (High Energy Phenomena in Relativistic Outflows) Conference (Heidelberg, Germany, July 2013), eds. F. Rieger and F. Aharonian, in Int. J. Mod. Phys. Conf. Ser
null
10.1142/S2010194514601665
null
astro-ph.HE astro-ph.CO physics.plasm-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper summarizes recent progresses in our theoretical understanding of particle acceleration at relativistic shock waves and it discusses two salient consequences: (1) the maximal energy of accelerated particles; (2) the impact of the shock-generated micro-turbulence on the multi-wavelength light curves of gamma-ray burst afterglows.
[ { "created": "Wed, 29 Jan 2014 07:46:23 GMT", "version": "v1" } ]
2015-06-18
[ [ "Lemoine", "M.", "", "IAP" ], [ "Pelletier", "G.", "", "IPAG" ] ]
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1401.7425
Gergely Kocsis
Imre Varga and Andr\'as N\'emeth and Gergely Kocsis
A novel method of generating tunable underlying network topologies for social simulation
Originally presented at the 2013 IEEE 4th International Conference on Cognitive Infocommunications (CogInfoCom)
2013 IEEE 4th CogInfoCom, 2-5. Dec. 2013, Budapest, Hungary, pp. 71-74
10.1109/CogInfoCom.2013.6719189
null
cs.SI physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose a method of generating different scale-free networks, which has several input parameters in order to adjust the structure, so that they can serve as a basis for computer simulation of real-world phenomena. The topological structure of these networks was studied to determine what kind of networks can be produced and how can we give the appropriate values of parameters to get a desired structure.
[ { "created": "Wed, 29 Jan 2014 07:59:07 GMT", "version": "v1" } ]
2014-01-30
[ [ "Varga", "Imre", "" ], [ "Németh", "András", "" ], [ "Kocsis", "Gergely", "" ] ]
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1401.7426
Ahmed Alkhateeb
Ahmed Alkhateeb, Omar El Ayach, Geert Leus, and Robert W. Heath Jr
Channel Estimation and Hybrid Precoding for Millimeter Wave Cellular Systems
36 pages, 10 figures, submitted to IEEE Journal of Selected Topics in Signal Processing
null
10.1109/JSTSP.2014.2334278
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Millimeter wave (mmWave) cellular systems will enable gigabit-per-second data rates thanks to the large bandwidth available at mmWave frequencies. To realize sufficient link margin, mmWave systems will employ directional beamforming with large antenna arrays at both the transmitter and receiver. Due to the high cost and power consumption of gigasample mixed-signal devices, mmWave precoding will likely be divided among the analog and digital domains. The large number of antennas and the presence of analog beamforming requires the development of mmWave-specific channel estimation and precoding algorithms. This paper develops an adaptive algorithm to estimate the mmWave channel parameters that exploits the poor scattering nature of the channel. To enable the efficient operation of this algorithm, a novel hierarchical multi-resolution codebook is designed to construct training beamforming vectors with different beamwidths. For single-path channels, an upper bound on the estimation error probability using the proposed algorithm is derived, and some insights into the efficient allocation of the training power among the adaptive stages of the algorithm are obtained. The adaptive channel estimation algorithm is then extended to the multi-path case relying on the sparse nature of the channel. Using the estimated channel, this paper proposes a new hybrid analog/digital precoding algorithm that overcomes the hardware constraints on the analog-only beamforming, and approaches the performance of digital solutions. Simulation results show that the proposed low-complexity channel estimation algorithm achieves comparable precoding gains compared to exhaustive channel training algorithms. The results also illustrate that the proposed algorithms can approach the coverage probability achieved by perfect channel knowledge even in the presence of interference.
[ { "created": "Wed, 29 Jan 2014 08:00:50 GMT", "version": "v1" } ]
2015-06-18
[ [ "Alkhateeb", "Ahmed", "" ], [ "Ayach", "Omar El", "" ], [ "Leus", "Geert", "" ], [ "Heath", "Robert W.", "Jr" ] ]
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1401.7435
Henok Getachew Alemayehu
Naod Duga Jebessa, Henok Getachew Alemayehu
Mobile Services and ICT4D, To the Network Economy - Bridging the Digital Divide, Ethiopia's Case
3rd Scientific Conference on Electrical Engineering, Organized by Ethiopian Society of Electrical Engineers and Electrical and Computer Engineering Department, Addis Ababa University, 22-23 August 2009. Keywords: mobile services, ICT4D, appropriate technologies, telecom in Ethiopia, development, Parlay/JAIN, techno-economics
null
null
null
cs.CY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper presents a development paradigm for Ethiopia, based on appropriate services and innovative use of mobile communications technologies via applications tailored for sectors like business, finance, healthcare, governance, education and infotainment. The experience of other developing countries like India and Kenya is cited so as to adapt those to the Ethiopian context. Notable application areas in the aforementioned sectors have been outlined. The ETC 'next generation network' is taken into consideration, with an emphasis on mobile service offering by the Telco itself and/or third party service providers. In addition, enabling technologies like mobile internet, location-based systems, open interfaces to large telecom networks, specifically service-oriented architecture (SOA), Parlay/JAIN and the like are discussed. The paper points out possible endeavors by such stakeholders like: telecom agencies and network operators; businesses, government and NGOs; entrepreneurs and innovators; technology companies and professionals; as well as researchers and academic institutions. ICT4D through mobile services and their role in bridging the digital divide by building a virtual 'network economy' is presented.
[ { "created": "Wed, 29 Jan 2014 08:48:28 GMT", "version": "v1" } ]
2014-01-30
[ [ "Jebessa", "Naod Duga", "" ], [ "Alemayehu", "Henok Getachew", "" ] ]
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1401.7436
Rahim Rahmani
Rahim Rahmani, Hasibur Rahman and Theo Kanter
On Performance of Logical-Clustering Of Flow-Sensors
13 pages, 15 Figures and published on International Journal of Computer Science Issues, IJCSI Volume 10 Issue 5, September 2013
null
null
null
cs.NI cs.DC
http://creativecommons.org/licenses/publicdomain/
In state-of-the-art Pervasive Computing, it is envisioned that unlimited access to information will be facilitated for anyone and anything. Wireless sensor networks will play a pivotal role in the stated vision. This reflects the phenomena where any situation can be sensed and analyzed anywhere. It makes heterogeneous context ubiquitous. Clustering context is one of the techniques to manage ubiquitous context information efficiently to maximize its potential. Logical-clustering is useful to share real-time context where sensors are physically distributed but logically clustered. This paper investigates the network performance of logical-clustering based on ns-3 simulations. In particular reliability, scalability, and reachability in terms of delay, jitter, and packet loss for the logically clustered network have been investigated. The performance study shows that jitter demonstrates 40 % and 44 % fluctuation for 200 % increase in the node per cluster and 100 % increase in the cluster size respectively. Packet loss exhibits only 18 % increase for 83 % increase in the packet flow-rate.
[ { "created": "Wed, 29 Jan 2014 09:00:31 GMT", "version": "v1" } ]
2014-01-30
[ [ "Rahmani", "Rahim", "" ], [ "Rahman", "Hasibur", "" ], [ "Kanter", "Theo", "" ] ]
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1401.7437
Rahim Rahmani
Theo Kanter, Rahim Rahmani, and Arif Mahmud
Conceptual Framework for Internet of Things' Virtualization via OpenFlow in Context-aware Networks
12 pages, 19 Figures, 1 table
International Journal of Computer Science Issues, ISSN: 1694-0784, 1694-0814, November 2013 Issue (Volume 10, Issue 6) http://ijcsi.org/papers/IJCSI-10-6-1-16-27.pdf
null
null
cs.NI cs.DC
http://creativecommons.org/licenses/publicdomain/
A novel conceptual framework is presented in this paper with an aim to standardize and virtualize Internet of Things(IoT) infrastructure through deploying OpenFlow technology. The framework can receivee services based on context information leaving the current infrastructure unchanged. This framework allows the active collaboration of heterogeneous devices and protocols. Moreover it is capable to model placement of physical objects, manage the system and to collect information for services deployed on an IoT infrastructure. Our proposed IoT virtualization is applicable to a random topology scenario which makes it possible to 1) share flow sensors resources 2) establish multioperational sensor networks, and 3) extend reachability within the framework without establishing any further physical networks. Flow sensors achieve better results comparable to the typical sensors with respect to packet generation, reachability, simulation time, throughput, energy consumption point of view. Even better results are possible through utilizing multicast groups in large scale networks.
[ { "created": "Wed, 29 Jan 2014 09:00:41 GMT", "version": "v1" } ]
2014-01-30
[ [ "Kanter", "Theo", "" ], [ "Rahmani", "Rahim", "" ], [ "Mahmud", "Arif", "" ] ]
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1401.7444
Yossi Gilad
Yossi Gilad, Amir Herzberg, Ari Trachtenberg
Securing Smartphones: A Micro-TCB Approach
null
null
null
null
cs.CR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
As mobile phones have evolved into `smartphones', with complex operating systems running third- party software, they have become increasingly vulnerable to malicious applications (malware). We introduce a new design for mitigating malware attacks against smartphone users, based on a small trusted computing base module, denoted uTCB. The uTCB manages sensitive data and sensors, and provides core services to applications, independently of the operating system. The user invokes uTCB using a simple secure attention key, which is pressed in order to validate physical possession of the device and authorize a sensitive action; this protects private information even if the device is infected with malware. We present a proof-of-concept implementation of uTCB based on ARM's TrustZone, a secure execution environment increasingly found in smartphones, and evaluate our implementation using simulations.
[ { "created": "Wed, 29 Jan 2014 09:20:53 GMT", "version": "v1" } ]
2014-01-30
[ [ "Gilad", "Yossi", "" ], [ "Herzberg", "Amir", "" ], [ "Trachtenberg", "Ari", "" ] ]
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1401.7450
Davor Horvatic
B. Podobnik, A. Majdandzic, C. Curme, Z. Qiao, W.-X. Zhou, H. E. Stanley, and B. Li
Network Risk and Forecasting Power in Phase-Flipping Dynamical Networks
5 pages, 4 figures
null
10.1103/PhysRevE.89.042807
null
physics.soc-ph physics.data-an q-fin.GN
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In order to model volatile real-world network behavior, we analyze phase-flipping dynamical scale-free network in which nodes and links fail and recover. We investigate how stochasticity in a parameter governing the recovery process affects phase-flipping dynamics, and find the probability that no more than q% of nodes and links fail. We derive higher moments of the fractions of active nodes and active links, $f_n(t)$ and $f_{\ell}(t)$, and define two estimators to quantify the level of risk in a network. We find hysteresis in the correlations of $f_n(t)$ due to failures at the node level, and derive conditional probabilities for phase-flipping in networks. We apply our model to economic and traffic networks.
[ { "created": "Wed, 29 Jan 2014 09:29:13 GMT", "version": "v1" } ]
2015-06-18
[ [ "Podobnik", "B.", "" ], [ "Majdandzic", "A.", "" ], [ "Curme", "C.", "" ], [ "Qiao", "Z.", "" ], [ "Zhou", "W. -X.", "" ], [ "Stanley", "H. E.", "" ], [ "Li", "B.", "" ] ]
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1401.7452
Alois Wuerger
Alois W\"urger
Leidenfrost Gas Ratchets Driven by Thermal Creep
4 pages, 5 figures
Phys. Rev. Lett. 107, 164502 (2011)
10.1103/PhysRevLett.107.164502
null
cond-mat.soft physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We show that thermal creep is at the origin of the recently discovered Leidenfrost ratchet, where liquid droplets float on a vapor layer along a heated sawtooth surface and accelerate to velocities of up to 40 cm=s. As the active element, the asymmetric temperature profile at each ratchet summit rectifies the vapor flow in the boundary layer. This mechanism works at low Reynolds number and provides a novel tool for controlling gas flow at nanostructured surfaces.
[ { "created": "Wed, 29 Jan 2014 09:41:03 GMT", "version": "v1" } ]
2014-01-30
[ [ "Würger", "Alois", "" ] ]
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1401.7457
Ruibang Luo
Chi-Man Liu, Ruibang Luo, Tak-Wah Lam
GPU-Accelerated BWT Construction for Large Collection of Short Reads
11 pages
null
null
null
q-bio.GN cs.DC cs.DS q-bio.QM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Advances in DNA sequencing technology have stimulated the development of algorithms and tools for processing very large collections of short strings (reads). Short-read alignment and assembly are among the most well-studied problems. Many state-of-the-art aligners, at their core, have used the Burrows-Wheeler transform (BWT) as a main-memory index of a reference genome (typical example, NCBI human genome). Recently, BWT has also found its use in string-graph assembly, for indexing the reads (i.e., raw data from DNA sequencers). In a typical data set, the volume of reads is tens of times of the sequenced genome and can be up to 100 Gigabases. Note that a reference genome is relatively stable and computing the index is not a frequent task. For reads, the index has to computed from scratch for each given input. The ability of efficient BWT construction becomes a much bigger concern than before. In this paper, we present a practical method called CX1 for constructing the BWT of very large string collections. CX1 is the first tool that can take advantage of the parallelism given by a graphics processing unit (GPU, a relative cheap device providing a thousand or more primitive cores), as well as simultaneously the parallelism from a multi-core CPU and more interestingly, from a cluster of GPU-enabled nodes. Using CX1, the BWT of a short-read collection of up to 100 Gigabases can be constructed in less than 2 hours using a machine equipped with a quad-core CPU and a GPU, or in about 43 minutes using a cluster with 4 such machines (the speedup is almost linear after excluding the first 16 minutes for loading the reads from the hard disk). The previously fastest tool BRC is measured to take 12 hours to process 100 Gigabases on one machine; it is non-trivial how BRC can be parallelized to take advantage a cluster of machines, let alone GPUs.
[ { "created": "Wed, 29 Jan 2014 10:06:07 GMT", "version": "v1" } ]
2014-01-30
[ [ "Liu", "Chi-Man", "" ], [ "Luo", "Ruibang", "" ], [ "Lam", "Tak-Wah", "" ] ]
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1401.7458
Konstantinos Eftaxias
Y. Contoyiannis, S. M. Potirakis, J. Kopanas, G. Antonopoulos, G. Koulouras, K. Eftaxias, C. Nomicos
On the recent seismic activity at Kefalonia island (Greece): Manifestations of an Earth system in critical state
This is a revised version of the initially submitted paper, after the occurrence of a second significant earthquake on the same island
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null
null
physics.geo-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we show, in terms of fracture-induced electromagnetic emissions (EME) that the Earth system around the focal areas came to critical condition a few days before the occurrence of each one of the two recent earthquakes of Kefalonia (Cephalonia), Greece. Specifically, EME were recorded two days prior to the first earthquake [(38.22o N, 20.53oE), 26 January 2014, M=6.1] & six days prior to the second one [(38.26o N, 20.39oE), 03 February 2014, M=6.0]. Specifically, the MHz EME recorded by the remote telemetric stations on the island of Kefalonia and the neighboring island of Zante came simultaneously to critical condition in both cases. The analysis was performed by means of the method of critical fluctuations (MCF) revealing critical features.
[ { "created": "Wed, 29 Jan 2014 10:07:31 GMT", "version": "v1" }, { "created": "Wed, 5 Feb 2014 11:05:35 GMT", "version": "v2" } ]
2014-02-06
[ [ "Contoyiannis", "Y.", "" ], [ "Potirakis", "S. M.", "" ], [ "Kopanas", "J.", "" ], [ "Antonopoulos", "G.", "" ], [ "Koulouras", "G.", "" ], [ "Eftaxias", "K.", "" ], [ "Nomicos", "C.", "" ] ]
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1401.7463
Pierre Flener
Pierre Flener and Justin Pearson
Propagators and Violation Functions for Geometric and Workload Constraints Arising in Airspace Sectorisation
null
null
null
null
cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Airspace sectorisation provides a partition of a given airspace into sectors, subject to geometric constraints and workload constraints, so that some cost metric is minimised. We make a study of the constraints that arise in airspace sectorisation. For each constraint, we give an analysis of what algorithms and properties are required under systematic search and stochastic local search.
[ { "created": "Wed, 29 Jan 2014 10:36:39 GMT", "version": "v1" } ]
2014-01-30
[ [ "Flener", "Pierre", "" ], [ "Pearson", "Justin", "" ] ]
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1401.7470
Hiroki Takesue
Hiroki Takesue, Nobuyuki Matsuda, Eiichi Kuramochi and Masaya Notomi
Entangled photons from on-chip slow light
5 pages, 3 figures. First draft
Scientific Reports 4, 3913 (2014) (full version)
10.1038/srep03913
null
quant-ph physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We report the first entanglement generation experiment using an on-chip slow light device. With highly efficient spontaneous four-wave mixing enhanced by the slow light effect in a coupled resonator optical waveguide based on a silicon photonic crystal, we generated 1.5-$\mu$m-band high-dimensional time-bin entangled photon pairs. We undertook two-photon interference experiments and observed the coincidence fringes with visibilities $>74\%$. The present result enables us to realize an on-chip entanglement source with a very small footprint, which is an essential function for quantum information processing based on integrated quantum photonics.
[ { "created": "Wed, 29 Jan 2014 11:02:59 GMT", "version": "v1" } ]
2014-01-30
[ [ "Takesue", "Hiroki", "" ], [ "Matsuda", "Nobuyuki", "" ], [ "Kuramochi", "Eiichi", "" ], [ "Notomi", "Masaya", "" ] ]
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1401.7471
Massimo Cafaro
Massimo Cafaro and Piergiuseppe Pell\`e
Space-efficient Verifiable Secret Sharing Using Polynomial Interpolation
Accepted for publication. To appear in IEEE Transactions on Cloud Computing
null
10.1109/TCC.2015.2396072
null
cs.CR cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Preserving data confidentiality in clouds is a key issue. Secret Sharing, a cryptographic primitive for the distribution of a secret among a group of $n$ participants designed so that only subsets of shareholders of cardinality $0 < t \leq n$ are allowed to reconstruct the secret by pooling their shares, can help mitigating and minimizing the problem. A desirable feature of Secret Sharing schemes is cheater detection, i.e. the ability to detect one or more malicious shareholders trying to reconstruct the secret by obtaining legal shares from the other shareholders while providing them with fake shares. Verifiable Secret Sharing schemes solve this problem by allowing shareholders verifying the others' shares. We present new verification algorithms providing arbitrary secret sharing schemes with cheater detection capabilities, and prove their space efficiency with regard to other schemes appeared in the literature. We also introduce, in one of our schemes, the Exponentiating Polynomial Root Problem (EPRP), which is believed to be NP-Intermediate and therefore difficult.
[ { "created": "Wed, 29 Jan 2014 11:03:33 GMT", "version": "v1" }, { "created": "Fri, 12 Sep 2014 10:17:42 GMT", "version": "v2" }, { "created": "Wed, 3 Dec 2014 16:33:04 GMT", "version": "v3" }, { "created": "Mon, 22 Dec 2014 16:06:31 GMT", "version": "v4" }, { "created": "Mon, 16 Feb 2015 18:01:29 GMT", "version": "v5" }, { "created": "Thu, 3 Sep 2015 08:19:26 GMT", "version": "v6" } ]
2015-09-04
[ [ "Cafaro", "Massimo", "" ], [ "Pellè", "Piergiuseppe", "" ] ]
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1401.7473
Antonio Moro
Antonio Moro and Stefano Trillo
Breaking mechanism from a vacuum point in the defocusing nonlinear Schroedinger equation
10 pages, 7 figures. To appear in Phys. Rev. E
null
10.1103/PhysRevE.89.023202
null
nlin.SI math-ph math.MP physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the wave breaking mechanism for the weakly dispersive defocusing nonlinear Schroedinger (NLS) equation with a constant phase dark initial datum that contains a vacuum point at the origin. We prove by means of the exact solution to the initial value problem that, in the dispersionless limit, the vacuum point is preserved by the dynamics until breaking occurs at a finite critical time. In particular, both Riemann invariants experience a simultaneous breaking at the origin. Although the initial vacuum point is no longer preserved in the presence of a finite dispersion, the critical behaviour manifests itself through an abrupt transition occurring around the breaking time.
[ { "created": "Wed, 29 Jan 2014 11:27:03 GMT", "version": "v1" } ]
2015-06-18
[ [ "Moro", "Antonio", "" ], [ "Trillo", "Stefano", "" ] ]
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1401.7474
Geoffroy Berthelot
Geoffroy Berthelot
The phenotypic expansion and its boundaries
Phd Thesis, 227 pages
null
null
null
stat.OT cs.MA nlin.AO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The development of sport performances in the future is a subject of myth and disagreement among experts. As arguments favoring and opposing such methodology were discussed, other publications empirically showed that the past development of performances followed a non linear trend. Other works, while deeply exploring the conditions leading to world records, highlighted that performance is tied to the economical and geopolitical context. Here we investigated the following human boundaries: development of performances with time in Olympic and non-Olympic events, development of sport performances with aging among humans and others species (greyhounds, thoroughbreds, mice). Development of performances from a broader point of view (demography & lifespan) in a specific sub-system centered on primary energy was also investigated. We show that the physiological developments are limited with time. Three major and direct determinants of sport performance are age, technology and climatic conditions (temperature). However, all observed developments are related to the international context including the efficient use of primary energies. This last parameter is a major indirect propeller of performance development. We show that when physiological and societal performance indicators such as lifespan and population density depend on primary energies, the energy source, competition and mobility are key parameters for achieving long term sustainable trajectories. Otherwise, the vast majority (98.7%) of the studied trajectories reaches 0 before 15 generations, due to the consumption of fossil energy and a low mobility rate. This led us to consider that in the present turbulent economical context and given the upcoming energy crisis, societal and physical performances are not expected to grow continuously.
[ { "created": "Wed, 29 Jan 2014 11:31:59 GMT", "version": "v1" } ]
2014-01-30
[ [ "Berthelot", "Geoffroy", "" ] ]
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1401.7480
Bruce Litow
Bruce Litow
NP is contained in DTIME(n^O(log^{gamma}))
paper has a fatal error
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cs.CC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We use existential Diophantine predicates carefully reinterpreted over the reals and the time complexity of Tarski algebra to show that 3-CNF SAT is in n^O(log^{gamma} n) time for an absolute positive constant gamma.
[ { "created": "Wed, 29 Jan 2014 12:07:54 GMT", "version": "v1" }, { "created": "Mon, 10 Feb 2014 20:41:46 GMT", "version": "v2" }, { "created": "Fri, 21 Feb 2014 17:51:20 GMT", "version": "v3" }, { "created": "Thu, 1 Mar 2018 19:57:17 GMT", "version": "v4" }, { "created": "Fri, 9 Mar 2018 21:24:25 GMT", "version": "v5" }, { "created": "Mon, 29 Jun 2020 20:14:38 GMT", "version": "v6" }, { "created": "Thu, 9 Jun 2022 13:58:13 GMT", "version": "v7" } ]
2022-06-10
[ [ "Litow", "Bruce", "" ] ]
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1401.7481
Markus Oberle
M. Oberle and B. Krusche
Quasi-free photoproduction of pion-pairs off protons and neutrons
4 pages, 2 figures, Physics of Excited Nucleons (NSTAR 2013). International Journal of Modern Physics: Conference Series 2013
null
10.1142/S2010194514601069
null
physics.acc-ph hep-ex nucl-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Beam-helicity asymmetries and mass-differential cross sections have been measured at the MAMI accelerator in Mainz for the photoproduction of neutral and mixed-charge pion pairs in the reactions $\boldsymbol{\gamma}p\rightarrow n\pi^0\pi^+$ and $\boldsymbol{\gamma}p\rightarrow p\pi^0\pi^0$ off free protons and $\boldsymbol{\gamma}d \rightarrow (p)p\pi^0\pi^-$, $\boldsymbol{\gamma}d\rightarrow (n)p\pi^0\pi^0$ and $\boldsymbol{\gamma}d\rightarrow (n)n\pi^0\pi^+$, $\boldsymbol{\gamma}d\rightarrow (p)n \pi^0\pi^0$ off quasi-free nucleons bound in the deuteron for incident photon energies up to 1.4 GeV. Circularly polarized photons were produced in bremsstrahlung processes of longitudinally polarized electrons and tagged with the Glasgow-Mainz magnetic spectrometer. The decay products (photons, protons, neutrons, and charged pions) were detected in the $4\pi$ electromagnetic calorimeter composed of the Crystal Ball and TAPS detectors. Using a full kinematic reconstruction of the final state, excellent agreement was found between the results for free and quasi-free protons, indicating that the quasi-free neutron results are also a close approximation of the free-neutron results. Comparisons of the results to predictions from model calculations suggest that especially the reaction mechanisms in the production of the mixed-charge final states are still not well understood, in particular at low incident photon energies in the second nucleon resonance region.
[ { "created": "Wed, 29 Jan 2014 12:12:48 GMT", "version": "v1" } ]
2014-01-30
[ [ "Oberle", "M.", "" ], [ "Krusche", "B.", "" ] ]
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1401.7483
Pawel Krawczyk
Pawel Krawczyk
Secure SAML validation to prevent XML signature wrapping attacks
null
null
null
null
cs.CR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
SAML assertions are becoming popular method for passing authentication and authorisation information between identity providers and consumers using various single sign-on protocols. However their practical security strongly depends on correct implementation, especially on the consumer side. Somorovsky and others have demonstrated a number of XML signature related vulnerabilities in SAML assertion validation frameworks. This article demonstrates how bad library documentation and examples can lead to vulnerable consumer code and how this can be avoided.
[ { "created": "Wed, 29 Jan 2014 12:13:19 GMT", "version": "v1" } ]
2014-01-30
[ [ "Krawczyk", "Pawel", "" ] ]
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Secure SAML validation to prevent XML signature wrapping attacks
http://arxiv.org/abs/1401.7483v1
http://arxiv.org/pdf/1401.7483v1.pdf
https://github.com/kravietz/java-saml-validator
true
true
https://paperswithcode.com/paper/secure-saml-validation-to-prevent-xml
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1401.7485
Nikita Polianskii
A. D'yachkov, V. Rykov, C. Deppe, V. Lebedev
Superimposed Codes and Threshold Group Testing
19 pages, 4 tables
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We will discuss superimposed codes and non-adaptive group testing designs arising from the potentialities of compressed genotyping models in molecular biology. The given paper was motivated by the 30th anniversary of D'yachkov-Rykov recurrent upper bound on the rate of superimposed codes published in 1982. We were also inspired by recent results obtained for non-adaptive threshold group testing which develop the theory of superimposed codes
[ { "created": "Wed, 29 Jan 2014 12:27:36 GMT", "version": "v1" } ]
2014-01-30
[ [ "D'yachkov", "A.", "" ], [ "Rykov", "V.", "" ], [ "Deppe", "C.", "" ], [ "Lebedev", "V.", "" ] ]
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1401.7486
Mehdi Gheisari
Payam Porkar Rezaeiye, mehrnoosh bazrafkan, ali akbar movassagh, Mojtaba Sedigh Fazli, Gholam hossein bazyari
Use HMM and KNN for classifying corneal data
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cs.CV
http://creativecommons.org/licenses/by-nc-sa/3.0/
These days to gain classification system with high accuracy that can classify complicated pattern are so useful in medicine and industry. In this article a process for getting the best classifier for Lasik data is suggested. However at first it's been tried to find the best line and curve by this classifier in order to gain classifier fitting, and in the end by using the Markov method a classifier for topographies is gained.
[ { "created": "Wed, 29 Jan 2014 12:27:39 GMT", "version": "v1" } ]
2014-01-30
[ [ "Rezaeiye", "Payam Porkar", "" ], [ "bazrafkan", "mehrnoosh", "" ], [ "movassagh", "ali akbar", "" ], [ "Fazli", "Mojtaba Sedigh", "" ], [ "bazyari", "Gholam hossein", "" ] ]
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1401.7492
Nikita Polianskii
A. Dyachkov
Lectures on DNA Codes
24 pages, 2 figures
A. Dyachkov, P. Vilenkin, I. Ismagilov, R. Sarbayev, A. Macula, D. Torney, P. White, "On dna codes"// Problems of Information Transmission, vol. 41, no. 4, pp. 349-367, 2005
null
null
cs.IT math.IT q-bio.QM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
For $q$-ary $n$-sequences, we develop the concept of similarity functions that can be used (for $q=4$) to model a thermodynamic similarity on DNA sequences. A similarity function is identified by the length of a longest common subsequence between two $q$-ary $n$-sequences. Codes based on similarity functions are called DNA codes. DNA codes are important components in biomolecular computing and other biotechnical applications that employ DNA hybridization assays. The main aim of the given lecture notes -- to discuss lower bounds on the rate of optimal DNA codes for a biologically motivated similarity function called a block similarity and for the conventional deletion similarity function used in the theory of error-correcting codes. We also present constructions of suboptimal DNA codes based on the parity-check code detecting one error in the Hamming metric.
[ { "created": "Wed, 29 Jan 2014 12:37:45 GMT", "version": "v1" } ]
2014-01-30
[ [ "Dyachkov", "A.", "" ] ]
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1401.7494
Johannes Hofmann
Johannes Hofmann, Jan Treibig, Georg Hager, Gerhard Wellein
Comparing the Performance of Different x86 SIMD Instruction Sets for a Medical Imaging Application on Modern Multi- and Manycore Chips
arXiv admin note: text overlap with arXiv:1401.3615
null
10.1145/2568058.2568068
null
cs.DC cs.PF
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Single Instruction, Multiple Data (SIMD) vectorization is a major driver of performance in current architectures, and is mandatory for achieving good performance with codes that are limited by instruction throughput. We investigate the efficiency of different SIMD-vectorized implementations of the RabbitCT benchmark. RabbitCT performs 3D image reconstruction by back projection, a vital operation in computed tomography applications. The underlying algorithm is a challenge for vectorization because it consists, apart from a streaming part, also of a bilinear interpolation requiring scattered access to image data. We analyze the performance of SSE (128 bit), AVX (256 bit), AVX2 (256 bit), and IMCI (512 bit) implementations on recent Intel x86 systems. A special emphasis is put on the vector gather implementation on Intel Haswell and Knights Corner microarchitectures. Finally we discuss why GPU implementations perform much better for this specific algorithm.
[ { "created": "Wed, 29 Jan 2014 12:41:44 GMT", "version": "v1" } ]
2014-01-30
[ [ "Hofmann", "Johannes", "" ], [ "Treibig", "Jan", "" ], [ "Hager", "Georg", "" ], [ "Wellein", "Gerhard", "" ] ]
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1401.7496
Natasa Golo
Sorin Solomon and Natasa Golo
Microeconomic Structure determines Macroeconomic Dynamics. Aoki defeats the Representative Agent
42 pages, 6 figures
null
null
null
q-fin.GN physics.soc-ph q-fin.ST
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Masanao Aoki developed a new methodology for a basic problem of economics: deducing rigorously the macroeconomic dynamics as emerging from the interactions of many individual agents. This includes deduction of the fractal / intermittent fluctuations of macroeconomic quantities from the granularity of the mezo-economic collective objects (large individual wealth, highly productive geographical locations, emergent technologies, emergent economic sectors) in which the micro-economic agents self-organize. In particular, we present some theoretical predictions, which also met extensive validation from empirical data in a wide range of systems: - The fractal Levy exponent of the stock market index fluctuations equals the Pareto exponent of the investors wealth distribution. The origin of the macroeconomic dynamics is therefore found in the granularity induced by the wealth / capital of the wealthiest investors. - Economic cycles consist of a Schumpeter 'creative destruction' pattern whereby the maxima are cusp-shaped while the minima are smooth. In between the cusps, the cycle consists of the sum of 2 'crossing exponentials': one decaying and the other increasing. This unification within the same theoretical framework of short term market fluctuations and long term economic cycles offers the perspective of a genuine conceptual synthesis between micro- and macroeconomics. Joining another giant of contemporary science - Phil Anderson - Aoki emphasized the role of rare, large fluctuations in the emergence of macroeconomic phenomena out of microscopic interactions and in particular their non self-averaging, in the language of statistical physics. In this light, we present a simple stochastic multi-sector growth model.
[ { "created": "Wed, 29 Jan 2014 12:49:47 GMT", "version": "v1" } ]
2014-01-30
[ [ "Solomon", "Sorin", "" ], [ "Golo", "Natasa", "" ] ]
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1401.7497
Deepak Mathur
Uma Ladiwala, Aseefhali Bankapur, Bhushan Thakur, Chidangil Santhosh, and Deepak Mathur
Raman spectroscopic detection of rapid, reversible, early-stage inflammatory cytokine-induced apoptosis of adult hippocampal progenitors/stem cells
Keywords: neural stem cell, Raman spectroscopy, cytokine, apoptosis
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physics.bio-ph physics.chem-ph physics.med-ph q-bio.TO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The role of neuro-inflammation in diverse, acute and chronic brain pathologies is being increasingly recognized. Neuro-inflammation is accompanied by increased levels of both pro- and anti-inflammatory cytokines; these have deleterious as well as protective/reparative effects. Inflammation has varying effects on neurogenesis and is a subject of intense contemporary interest. We show that TNF-alpha and IFN-gamma, used concomitantly, cause apoptosis of adult rat hippocampal progenitor/stem cells in vitro as detected by the TUNEL and MTT assays on time scales of several hours. We have coupled Raman spectroscopy to an optical trap to probe early changes of apoptosis in single, live neural stem cells that have been treated with pro-inflammatory cytokines, TNF-alpha and IFN-gamma. Changes caused by inflammation-induced denaturation of DNA are observed in the Raman spectra that correspond to very early stages of apoptosis, occurring on very fast time scales: as short as 10 minutes. Addition of the anti-inflammatory cytokine IL-10 either 10-30 min before or 10-30 min after treatment with TNF-alpha and IFN-gamma reverses the changes substantially. Our findings imply that inflammation can induce very rapid changes leading to cell death but that these are reversible, in the early stages at least.
[ { "created": "Wed, 29 Jan 2014 12:52:28 GMT", "version": "v1" } ]
2014-01-30
[ [ "Ladiwala", "Uma", "" ], [ "Bankapur", "Aseefhali", "" ], [ "Thakur", "Bhushan", "" ], [ "Santhosh", "Chidangil", "" ], [ "Mathur", "Deepak", "" ] ]
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1401.7498
Aleksi Saarela
Aleksi Saarela
Systems of word equations, polynomials and linear algebra: A new approach
19 pages, submitted to a journal, extended version of the conference paper arXiv:1108.3637
European J. Combin. 47 (2015) 1-14
10.1016/j.ejc.2015.01.005
null
math.CO cs.FL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We develop a new tool, namely polynomial and linear algebraic methods, for studying systems of word equations. We illustrate its usefulness by giving essentially simpler proofs of several hard problems. At the same time we prove extensions of these results. Finally, we obtain the first nontrivial upper bounds for the fundamental problem of the maximal size of independent systems. These bounds depend quadratically on the size of the shortest equation. No methods of having such bounds have been known before.
[ { "created": "Wed, 29 Jan 2014 12:52:44 GMT", "version": "v1" } ]
2015-02-10
[ [ "Saarela", "Aleksi", "" ] ]
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1401.7499
Mehdi Gheisari
Manaf Sharifzadeh, saeid aragy, Kaveh Bashash, Shahram Bashokian, mehdi gheisari
A Comparison with two semantic sensor data storages in total data transmission
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cs.NI
http://creativecommons.org/licenses/by/3.0/
The creation of small and cheap sensors promoted the emergence of large scale sensor networks. Sensor networks allow monitoring a variety of physical phenomena, like weather conditions (temperature, humidity, atmospheric pressure ...), traffic levels on highways or rooms occupancy in public buildings. Some of the sensors produce large volume of data such as weather temperature. These data should be stored somewhere for user queries. In this paper two known sensor data storage methods that store data semantically has been compared and it has been shown that storing data in ontology form consumes more energy so the lifetime of sensor network would decreases. The reason we choose them is that they are useful and popular.
[ { "created": "Wed, 29 Jan 2014 12:53:12 GMT", "version": "v1" } ]
2014-01-30
[ [ "Sharifzadeh", "Manaf", "" ], [ "aragy", "saeid", "" ], [ "Bashash", "Kaveh", "" ], [ "Bashokian", "Shahram", "" ], [ "gheisari", "mehdi", "" ] ]
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1401.7505
Nikita Polianskii
Arkadii G. D'yachkov
Lectures on Designing Screening Experiments
66 pages
Lecture Note Series 10, Feb. 2004, Combinatorial and Computational Mathematics Center, Pohang University of Science and Technology (POSTECH), Korea Republic, (monograph, pp. 112)
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Designing Screening Experiments (DSE) is a class of information - theoretical models for multiple - access channels (MAC). We discuss the combinatorial model of DSE called a disjunct channel model. This model is the most important for applications and closely connected with the superimposed code concept. We give a detailed survey of lower and upper bounds on the rate of superimposed codes. The best known constructions of superimposed codes are considered in paper. We also discuss the development of these codes (non-adaptive pooling designs) intended for the clone - library screening problem. We obtain lower and upper bounds on the rate of binary codes for the combinatorial model of DSE called an adder channel model. We also consider the concept of universal decoding for the probabilistic DSE model called a symmetric model of DSE.
[ { "created": "Wed, 29 Jan 2014 13:16:40 GMT", "version": "v1" } ]
2014-01-30
[ [ "D'yachkov", "Arkadii G.", "" ] ]
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1401.7507
Evgeny Liverts
Evgeny Z. Liverts and Nir Barnea
Analytic matrix elements for the two-electron atomic basis with logarithmic terms
19 pages, 1 table, 5 figures
null
10.1063/1.4890562
null
math-ph math.MP physics.atom-ph physics.comp-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The two-electron problem for the helium-like atom/ions in $S$-state is considered. The basis containing the integer powers of $\ln r$, where $r$ is a radial variable of the Fock expansion, is studied. In this basis, the analytic expressions for the matrix elements of the corresponding Hamiltonian are presented. These expressions include only special functions presented by the built-in $Mathematica$ codes, what enables very fast and accurate computation of the matrix elements. The decisive contribution of the correct logarithmic terms to the behavior of the two-electron wave function in the vicinity of the triple-coalescence point is reaffirmed.
[ { "created": "Wed, 29 Jan 2014 13:20:52 GMT", "version": "v1" } ]
2015-06-18
[ [ "Liverts", "Evgeny Z.", "" ], [ "Barnea", "Nir", "" ] ]
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1401.7508
Nikita Polianskii
A.G. D'yachkov, A.J. Macula, D.C. Torney, P.A. Vilenkin
Two Models of Nonadaptive Group Testing for Designing Screening Experiments
10 pages
Proceedings of the 6th International Workshop on Model Oriented Design and Analysis, pp. 63-75, Physica-Verlag Heidelberg, Puchberg/Schneeberg, Austria, 2001
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We discuss two non-standard models of nonadaptive combinatorial search which develop the conventional disjunct search model for a small number of defective elements contained in a finite ground set or a population. The first model is called a search of defective supersets. The second model is called a search of defective subsets in the presence of inhibitors. For these models, we study the constructive search methods based on the known constructions for the disjunct model.
[ { "created": "Wed, 29 Jan 2014 13:27:11 GMT", "version": "v1" } ]
2014-01-30
[ [ "D'yachkov", "A. G.", "" ], [ "Macula", "A. J.", "" ], [ "Torney", "D. C.", "" ], [ "Vilenkin", "P. A.", "" ] ]
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1401.7517
Mikhail Kharinov Vyacheslavovich
M. Kharinov
Information quantity in a pixel of digital image
11 pages, 4 figures, 1 definition, 5 formulas
M.V. Kharinov, Information quantity in a pixel of digital image, Bulletin of the Buryat State University. Mathematics and Informatics. 2013. No 2, Ulan-Ude, Russia, pp. 95-104. ISSN 2304-5728 [in Russian]
null
null
cs.CV cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The paper is devoted to the problem of integer-valued estimating of information quantity in a pixel of digital image. The definition of an integer estimation of information quantity based on constructing of the certain binary hierarchy of pixel clusters is proposed. The methods for constructing hierarchies of clusters and generating of hierarchical sequences of image approximations that minimally differ from the image by a standard deviation are developed. Experimental results on integer-valued estimation of information quantity are compared with the results obtained by utilizing of the classical formulas.
[ { "created": "Wed, 29 Jan 2014 14:03:46 GMT", "version": "v1" } ]
2014-03-19
[ [ "Kharinov", "M.", "" ] ]
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1401.7520
Kin Hung Fung
C. W. Ling, Meng Xiao, C. T. Chan, S. F. Yu, and Kin Hung Fung
Topological Edge Plasmon Modes between Diatomic Chains of Nanoparticles
7 pages, 6 figures
Opt Express 23, 2021-2031 (2015)
10.1364/OE.23.002021
null
cond-mat.mes-hall physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the topological edge plasmon modes between two "diatomic" chains of identical plasmonic nanoparticles. Zak phase for longitudinal plasmon modes in each chain is calculated analytically by solutions of macroscopic Maxwell's equations for particles in quasi-static dipole approximation. This approximation provides a direct analogy with the Su-Schrieffer-Heeger model such that the eigenvalue is mapped to the frequency dependent inverse-polarizability of the nanoparticles. The edge state frequency is found to be the same as the single-particle resonance frequency, which is insensitive to the separation distances within a unit cell. Finally, full electrodynamic simulations with realistic parameters suggest that the edge plasmon mode can be realized through near-field optical spectroscopy.
[ { "created": "Wed, 29 Jan 2014 14:10:31 GMT", "version": "v1" }, { "created": "Fri, 8 Aug 2014 09:11:05 GMT", "version": "v2" }, { "created": "Sat, 1 Nov 2014 04:07:30 GMT", "version": "v3" }, { "created": "Fri, 8 May 2015 02:25:39 GMT", "version": "v4" } ]
2015-05-11
[ [ "Ling", "C. W.", "" ], [ "Xiao", "Meng", "" ], [ "Chan", "C. T.", "" ], [ "Yu", "S. F.", "" ], [ "Fung", "Kin Hung", "" ] ]
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1401.7528
Reza Farrahi Moghaddam
Reza Farrahi Moghaddam, Vahid Asghari, Fereydoun Farrahi Moghaddam, Yves Lemieux, Mohamed Cheriet
A Monte-Carlo Approach to Lifespan Failure Performance Analysis of the Network Fabric in Modular Data Centers
29 Pages, 14 figures
null
10.1016/j.jnca.2017.03.015
null
cs.PF cs.DC cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Data centers have been evolved from a passive element of compute infrastructure to become an active, core part of any ICT solution. In particular, modular data centers (MDCs), which are a promising design approach to improve resiliency of data centers, can play a key role in deploying ICT infrastructure in remote and inhospitable environments in order to take advantage of low temperatures and hydro- and wind-electric capabilities. This is because of capability of the modular data centers to survive even in lack of continuous on-site maintenance and support. The most critical part of a data center is its network fabric that could impede the whole system even if all other components are fully functional, assuming that other analyses has been already performed to ensure the reliability of the underlying infrastructure and support systems. In this work, a complete failure analysis of modular data centers using failure models of various components including servers, switches, and links is performed using a proposed Monte-Carlo approach. The proposed Monte-Carlo approach, which is based on the concept of snapshots, allows us to effectively calculate the performance of a design along its lifespan even up to the terminal stages. To show the capabilities of the proposed approach, various network topologies, such as FatTree, BCube, MDCube, and their modifications are considered. The performance and also the lifespan of each topology design in presence of failures of their components are studied against the topology parameters.
[ { "created": "Wed, 29 Jan 2014 15:02:16 GMT", "version": "v1" }, { "created": "Wed, 12 Mar 2014 03:33:12 GMT", "version": "v2" }, { "created": "Wed, 22 Mar 2017 16:23:49 GMT", "version": "v3" } ]
2017-03-23
[ [ "Moghaddam", "Reza Farrahi", "" ], [ "Asghari", "Vahid", "" ], [ "Moghaddam", "Fereydoun Farrahi", "" ], [ "Lemieux", "Yves", "" ], [ "Cheriet", "Mohamed", "" ] ]
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1401.7532
Ludo M.G.M. Tolhuizen
Oscar Garcia-Morchon and Ronald Rietman and Ludo Tolhuizen and Domingo Gomez and Jaime Gutierrez
The MMO problem
Submitted to Interantaional Symposium on Symbolic and Algebraic Computation (ISSAC) 2014
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math.RA cs.CR cs.SC math.NT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider a two polynomials analogue of the polynomial interpolation problem. Namely, we consider the Mixing Modular Operations (MMO) problem of recovering two polynomials $f\in \Z_p[x]$ and $g\in \Z_q[x]$ of known degree, where $p$ and $q$ are two (un)known positive integers, from the values of $f(t)\bmod p + g(t)\bmod q$ at polynomially many points $t \in \Z$. We show that if $p$ and $q$ are known, the MMO problem is equivalent to computing a close vector in a lattice with respect to the infinity norm. We also implemented in the SAGE system a heuristic polynomial-time algorithm. If $p$ and $q$ are kept secret, we do not know how to solve this problem. This problem is motivated by several potential cryptographic applications.
[ { "created": "Wed, 29 Jan 2014 15:07:28 GMT", "version": "v1" } ]
2014-01-30
[ [ "Garcia-Morchon", "Oscar", "" ], [ "Rietman", "Ronald", "" ], [ "Tolhuizen", "Ludo", "" ], [ "Gomez", "Domingo", "" ], [ "Gutierrez", "Jaime", "" ] ]
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1401.7533
Cedric Herzet
C\'edric Herzet, Ang\'elique Dr\'emeau and Charles Soussen
Relaxed Recovery Conditions for OMP/OLS by Exploiting both Coherence and Decay
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null
null
null
cs.IT math.IT
http://creativecommons.org/licenses/by/4.0/
We propose extended coherence-based conditions for exact sparse support recovery using orthogonal matching pursuit (OMP) and orthogonal least squares (OLS). Unlike standard uniform guarantees, we embed some information about the decay of the sparse vector coefficients in our conditions. As a result, the standard condition $\mu<1/(2k-1)$ (where $\mu$ denotes the mutual coherence and $k$ the sparsity level) can be weakened as soon as the non-zero coefficients obey some decay, both in the noiseless and the bounded-noise scenarios. Furthermore, the resulting condition is approaching $\mu<1/k$ for strongly decaying sparse signals. Finally, in the noiseless setting, we prove that the proposed conditions, in particular the bound $\mu<1/k$, are the tightest achievable guarantees based on mutual coherence.
[ { "created": "Wed, 29 Jan 2014 15:09:10 GMT", "version": "v1" }, { "created": "Sat, 23 Aug 2014 10:32:17 GMT", "version": "v2" }, { "created": "Thu, 8 Oct 2015 12:55:46 GMT", "version": "v3" } ]
2015-10-09
[ [ "Herzet", "Cédric", "" ], [ "Drémeau", "Angélique", "" ], [ "Soussen", "Charles", "" ] ]
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1401.7535
Derek O'Callaghan
Derek O'Callaghan, Nico Prucha, Derek Greene, Maura Conway, Joe Carthy, P\'adraig Cunningham
Online Social Media in the Syria Conflict: Encompassing the Extremes and the In-Betweens
8 pages, 3 figures, 3 tables. Minor changes including additional references
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cs.SI cs.CY physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Syria conflict has been described as the most socially mediated in history, with online social media playing a particularly important role. At the same time, the ever-changing landscape of the conflict leads to difficulties in applying analytical approaches taken by other studies of online political activism. Therefore, in this paper, we use an approach that does not require strong prior assumptions or the proposal of an advance hypothesis to analyze Twitter and YouTube activity of a range of protagonists to the conflict, in an attempt to reveal additional insights into the relationships between them. By means of a network representation that combines multiple data views, we uncover communities of accounts falling into four categories that broadly reflect the situation on the ground in Syria. A detailed analysis of selected communities within the anti-regime categories is provided, focusing on their central actors, preferred online platforms, and activity surrounding "real world" events. Our findings indicate that social media activity in Syria is considerably more convoluted than reported in many other studies of online political activism, suggesting that alternative analytical approaches can play an important role in this type of scenario.
[ { "created": "Wed, 29 Jan 2014 15:10:56 GMT", "version": "v1" }, { "created": "Fri, 11 Apr 2014 13:38:20 GMT", "version": "v2" }, { "created": "Wed, 13 Aug 2014 15:25:23 GMT", "version": "v3" } ]
2014-08-14
[ [ "O'Callaghan", "Derek", "" ], [ "Prucha", "Nico", "" ], [ "Greene", "Derek", "" ], [ "Conway", "Maura", "" ], [ "Carthy", "Joe", "" ], [ "Cunningham", "Pádraig", "" ] ]
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1401.7536
Jean-Marc Ginoux JMG
Jean-Marc Ginoux
The First "lost" International Conference on Nonlinear Oscillations (I.C.N.O.)
8 pages, 1 figure, International Journal of Bifurcation and Chaos, Vol. 22, No. 04, April 2012
null
10.1142/S0218127412500976
null
physics.hist-ph nlin.CD
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
From 28 to 30 January 1933 was held at the Institut Henri Poincar\'{e} (Paris) the first International Conference of Nonlinear Oscillations organized at the initiative of the Dutch physicist Balthazar Van der Pol and of the Russian mathematician Nikola\"{i} Dmitrievich Papaleksi. The discovery of this forgotten event, whose virtually no trace remains, was made possible thanks to the report written by Papaleksi at his return in USSR. This document has revealed, one the one hand, the list of participants who included French mathematicians: Alfred Li\'{e}nard, \'{E}lie and Henri Cartan, Henri Abraham, Eug\`{e}ne Bloch, L\'{e}on Brillouin, Yves Rocard, ... and, on the other hand the content of presentations and discussions. The analysis of the minutes of this conference presented here for the first time highlights the role and involvement of the French scientific community in the development of the theory of nonlinear oscillations.
[ { "created": "Mon, 27 Jan 2014 14:19:06 GMT", "version": "v1" } ]
2014-01-30
[ [ "Ginoux", "Jean-Marc", "" ] ]
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1401.7538
Cedric Herzet
C\'edric Herzet and Ang\'elique Dr\'emeau
Bayesian Pursuit Algorithms
null
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper addresses the sparse representation (SR) problem within a general Bayesian framework. We show that the Lagrangian formulation of the standard SR problem, i.e., $\mathbf{x}^\star=\arg\min_\mathbf{x} \lbrace \| \mathbf{y}-\mathbf{D}\mathbf{x} \|_2^2+\lambda\| \mathbf{x}\|_0 \rbrace$, can be regarded as a limit case of a general maximum a posteriori (MAP) problem involving Bernoulli-Gaussian variables. We then propose different tractable implementations of this MAP problem that we refer to as "Bayesian pursuit algorithms". The Bayesian algorithms are shown to have strong connections with several well-known pursuit algorithms of the literature (e.g., MP, OMP, StOMP, CoSaMP, SP) and generalize them in several respects. In particular, i) they allow for atom deselection; ii) they can include any prior information about the probability of occurrence of each atom within the selection process; iii) they can encompass the estimation of unkown model parameters into their recursions.
[ { "created": "Wed, 29 Jan 2014 15:24:50 GMT", "version": "v1" } ]
2014-01-30
[ [ "Herzet", "Cédric", "" ], [ "Drémeau", "Angélique", "" ] ]
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1401.7539
Mojeeb AL-Rhman Alkhiaty
Mojeeb Al-Rhman Al-Khiaty, Moataz Ahmed
Automatic Reference Models Development: A Framework
null
null
10.7321/jscse.v3.n3.17
null
cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Software reuse allows the software industry to simultaneously reduce development cost and improve product quality. Reuse of early-stage artifacts has been acknowledged to be more beneficial than reuse of later-stage artifacts. In this regard, early-stage reference models have been considered as good tools to allow reuse across applications within the same domain. However, our literature survey reported in this paper reveals that the problem of automatically developing reference models from given instances has not caught enough researchers attention yet. Accordingly, in this paper we propose a framework for building a reference model that captures the common and variable analysis/design practices, across the different applications in a domain. The framework considers multi-view models in assessing the commonalities and variabilities among given instances. The proposed framework incorporates learning capabilities to allow improving the quality and re-usability of the reference model as it is being used.
[ { "created": "Wed, 29 Jan 2014 15:25:18 GMT", "version": "v1" } ]
2014-01-30
[ [ "Al-Khiaty", "Mojeeb Al-Rhman", "" ], [ "Ahmed", "Moataz", "" ] ]
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1401.7540
Somnath Sikdar
Felix Reidl, Peter Rossmanith, Fernando Sanchez Villaamil, Somnath Sikdar
A Faster Parameterized Algorithm for Treedepth
An extended abstract was published in ICALP 2014, Track A
null
null
null
cs.DS cs.DM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The width measure \emph{treedepth}, also known as vertex ranking, centered coloring and elimination tree height, is a well-established notion which has recently seen a resurgence of interest. We present an algorithm which---given as input an $n$-vertex graph, a tree decomposition of the graph of width $w$, and an integer $t$---decides Treedepth, i.e. whether the treedepth of the graph is at most $t$, in time $2^{O(wt)} \cdot n$. If necessary, a witness structure for the treedepth can be constructed in the same running time. In conjunction with previous results we provide a simple algorithm and a fast algorithm which decide treedepth in time $2^{2^{O(t)}} \cdot n$ and $2^{O(t^2)} \cdot n$, respectively, which do not require a tree decomposition as part of their input. The former answers an open question posed by Ossona de Mendez and Nesetril as to whether deciding Treedepth admits an algorithm with a linear running time (for every fixed $t$) that does not rely on Courcelle's Theorem or other heavy machinery. For chordal graphs we can prove a running time of $2^{O(t \log t)}\cdot n$ for the same algorithm.
[ { "created": "Wed, 29 Jan 2014 15:26:04 GMT", "version": "v1" }, { "created": "Fri, 31 Jan 2014 14:05:37 GMT", "version": "v2" }, { "created": "Wed, 5 Feb 2014 09:05:49 GMT", "version": "v3" }, { "created": "Wed, 20 Aug 2014 08:54:18 GMT", "version": "v4" } ]
2014-08-21
[ [ "Reidl", "Felix", "" ], [ "Rossmanith", "Peter", "" ], [ "Villaamil", "Fernando Sanchez", "" ], [ "Sikdar", "Somnath", "" ] ]
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1401.7542
Sattin Fabio
F. Sattin, D.F. Escande, F. Auriemma, G. Urso, D. Terranova
Perturbative transport experiments: to what extent do they really probe microscopic transport?
To be submitted to Plasma Physics and Controlled Fusion, cluster issue on "Physics-based Optimization of Plasma Diagnostic Information"
null
null
null
physics.plasm-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Experiments featuring fast heat propagation, or so called "non-local" transport, were a puzzle for almost two decades. However recently it was shown, and it is recalled here, that a collective ideal MHD response of the plasma provides a quantitative agreement with these experiments, whereas transport plays just a secondary role. Then this work reviews the algebraic approach to transport data inversion that provides a formally exact solution, as well as a quantitative assessment of error bars, limited to periodic signals. Conversely, standard transport reconstructions are shown to sometimes fail to match the exact solution. The adoption of automated global search algorithms based upon Genetic Algorithms is bound to greatly increase the probability of finding optimal solutions. Finally, the standard methods of reconstruction infer the diffusivity D and pinch V by matching experimental data against those simulated by transport codes. These methods do not warrant the validity neither of the underlying models of transport, nor of the reconstructed D(r) and V(r), even when the results look reasonable.
[ { "created": "Wed, 29 Jan 2014 15:27:00 GMT", "version": "v1" } ]
2014-01-30
[ [ "Sattin", "F.", "" ], [ "Escande", "D. F.", "" ], [ "Auriemma", "F.", "" ], [ "Urso", "G.", "" ], [ "Terranova", "D.", "" ] ]
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1401.7547
Sadi Seker E
Mehmet Lutfi Arslan, Sadi Evren Seker
Web Based Reputation Index of Turkish Universities
null
International Journal of E-Education E-Business E-Management and E-Learning (IJEEEE), Issn : 2010-3654, vol.4, is.3, pp.197-203, 2014
null
null
cs.DL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper attempts to develop an online reputation index of Turkish universities through their online impact and effectiveness. Using 16 different web based parameters and employing normalization process of the results, we have ranked websites of Turkish universities in terms of their web presence. This index is first attempt to determine the tools of reputation of Turkish academic websites and would be a basis for further studies to examine the relation between reputation and the online effectiveness of the universities.
[ { "created": "Sat, 25 Jan 2014 23:33:08 GMT", "version": "v1" } ]
2014-01-30
[ [ "Arslan", "Mehmet Lutfi", "" ], [ "Seker", "Sadi Evren", "" ] ]
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1401.7554
Simon Zihlmann
Simon Zihlmann, Felix L\"u\"ond, Johanna K. Spiegel
Seeded growth of monodisperse and spherical silver nanoparticles
17(5) pages, 8(4) figures main article (supplementary), submitted to Journal of Aerosol Science
Journal of Aerosol Science, 75, 81-93, 2014
10.1016/j.jaerosci.2014.05.006
null
cond-mat.mtrl-sci physics.ao-ph physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Aiming at spherical and monodisperse silver nanoparticles with diameters up to 100 nm, the potential of heterogeneous nucleation of silver particles was explored. Gold seed particles, mainly produced with a spark discharge generator, were carried by nitrogen through a three-zone tube furnace. Silver was evaporated at 1210 {\deg}C in the first zone of the furnace and particle growth and shaping took place in the subsequent zones, heated to 730 {\deg}C and 390 {\deg}C respectively. The generated aerosol was monitored by a scanning mobility particle sizer (SMPS), while parameters, such as furnace temperature, seed particle size and concentration and nitrogen carrier gas flow, were investigated. Off-line atomic force microscopy (AFM) and transmission electron microscopy (TEM) were used to characterize the morphology of the silver nanoparticles in addition to the SMPS scans. Spherical silver nanoparticles with a mobility diameter of more than 115 nm and a geometric standard deviation of typically 1.09 or lower at concentrations as large as 5e5cm^{-3} could be produced. The mobility diameter of the monodisperse aerosol could be varied in the range of 50 nm to 115 nm by changing the furnace temperature or the gold seed particle size. Elemental analysis revealed that the gold from the seed particles formed a homogeneous alloy with the silver (< 3.5 atomic percent of gold). The growth mechanism could not be identified unambiguously since the obtained silver particles could both originate from heterogeneous nucleation of silver vapour on the seed particles or from coagulation and coalescence of the seed particles with smaller, homogeneously nucleated silver particles. Moreover, the narrow size distribution opens the opportunity to obtain an exclusively singly charged, monodisperse calibration aerosol at sufficient concentrations after and additional mobility selection process.
[ { "created": "Wed, 29 Jan 2014 15:42:16 GMT", "version": "v1" }, { "created": "Wed, 30 Apr 2014 19:11:10 GMT", "version": "v2" }, { "created": "Mon, 23 Jun 2014 20:22:45 GMT", "version": "v3" } ]
2014-06-25
[ [ "Zihlmann", "Simon", "" ], [ "Lüönd", "Felix", "" ], [ "Spiegel", "Johanna K.", "" ] ]
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1401.7558
Shengmei Zhao
Shengmei Zhao, Bei Wang, Li Zhou, Longyan Gong, Wenwen Cheng, Yubo Sheng and Baoyu Zheng
Turbulence Mitigation Scheme for Optical Communications using Orbital Angular Momentum Multiplexing Based on Channel Coding and Wavefront Correction
null
null
null
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The free-space optical (FSO) communication links with orbital angular momentum (OAM) multiplexing have been demonstrated that they can largely enhance the systems' capacity without a corresponding increase in spectral bandwidth, but the performance of the system is unavoidably disturbed by atmospheric turbulence (AT). Different from the existed AT disturbance, the OAM-multiplexed systems will cause both the burst and random errors for a single OAM state carrier and the `crosstalk' interference between the different OAM states carriers. In this paper, we propose a turbulence mitigation method to improve AT tolerance of OAM-multiplexed FSO communication links. In the proposed scheme, we use channel codes to correct the burst and random errors caused by AT for a single OAM state carrier; And we use wavefront correction method to correct the `crosstalk' interference between the different OAM states carriers. The improvements of AT tolerance are discussed by comparing the performance of OAM-multiplexed FSO communication links with or without channel coding or Shark-Hartmann wavefront correction method. The numerical simulation results show that the OAM-multiplexed FSO communication links have enhanced their AT tolerance. The usage of channel codes and wavefront correction methods together has improved greatly the performance of OAM-multiplexed FSO communication links over atmospheric turbulence.
[ { "created": "Wed, 29 Jan 2014 15:45:44 GMT", "version": "v1" } ]
2014-01-30
[ [ "Zhao", "Shengmei", "" ], [ "Wang", "Bei", "" ], [ "Zhou", "Li", "" ], [ "Gong", "Longyan", "" ], [ "Cheng", "Wenwen", "" ], [ "Sheng", "Yubo", "" ], [ "Zheng", "Baoyu", "" ] ]
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1401.7560
Mindaugas Bloznelis
Mindaugas Bloznelis and Friedrich G\"otze
Preferred attachment model of affiliation network
9 pages
null
10.1007/s10955-014-1033-8
null
physics.soc-ph math.PR physics.data-an
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In an affiliation network vertices are linked to attributes and two vertices are declared adjacent whenever they share a common attribute. For example, two customers of an internet shop are called adjacent if they have purchased the same or similar items. Assuming that each newly arrived customer is linked preferentially to already popular items we obtain a preferred attachment model of an evolving affiliation network. We show that the network has a scale-free property and establish the asymptotic degree distribution.
[ { "created": "Tue, 28 Jan 2014 12:59:54 GMT", "version": "v1" } ]
2015-06-18
[ [ "Bloznelis", "Mindaugas", "" ], [ "Götze", "Friedrich", "" ] ]
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1401.7564
Krzysztof Jachymski
Krzysztof Jachymski, Zbigniew Idziaszek and Tommaso Calarco
Fast quantum gate via Feshbach-Pauli blocking in a nanoplasmonic trap
5 pages
Phys. Rev. Lett. 112, 250502 (2014)
10.1103/PhysRevLett.112.250502
null
quant-ph cond-mat.quant-gas physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose a simple idea for realizing a quantum gate with two identical fermions in a double well trap via external optical pulses without addressing the atoms individually. The key components of the scheme are Feshbach resonance and Pauli blocking, which decouple unwanted states from the dynamics. As a physical example we study atoms in the presence of a magnetic Feshbach resonance in a nanoplasmonic trap and discuss the constraints on the operation times for realistic parameters, reaching a fidelity above $99.9\%$ within $42\mu$s.
[ { "created": "Wed, 29 Jan 2014 16:01:21 GMT", "version": "v1" }, { "created": "Thu, 26 Jun 2014 08:36:21 GMT", "version": "v2" } ]
2014-06-27
[ [ "Jachymski", "Krzysztof", "" ], [ "Idziaszek", "Zbigniew", "" ], [ "Calarco", "Tommaso", "" ] ]
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1401.7571
Kevin Heng
Kevin Heng, Jared Workman
Analytical Models of Exoplanetary Atmospheres. I. Atmospheric Dynamics via the Shallow Water System
Accepted by ApJS, 36 pages, 6 figures, 3 tables, 273 equations
null
10.1088/0067-0049/213/2/27
null
astro-ph.EP physics.ao-ph physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Within the context of exoplanetary atmospheres, we present a comprehensive linear analysis of forced, damped, magnetized shallow water systems, exploring the effects of dimensionality, geometry (Cartesian, pseudo-spherical and spherical), rotation, magnetic tension and hydrodynamic and magnetic sources of friction. Across a broad range of conditions, we find that the key governing equation for atmospheres and quantum harmonic oscillators are identical, even when forcing (stellar irradiation), sources of friction (molecular viscosity, Rayleigh drag and magnetic drag) and magnetic tension are included. The global atmospheric structure is largely controlled by a single, key parameter that involves the Rossby and Prandtl numbers. This near-universality breaks down when either molecular viscosity or magnetic drag acts non-uniformly across latitude or a poloidal magnetic field is present, suggesting that these effects will introduce qualitative changes to the familiar chevron-shaped feature witnessed in simulations of atmospheric circulation. We also find that hydrodynamic and magnetic sources of friction have dissimilar phase signatures and affect the flow in fundamentally different ways, implying that using Rayleigh drag to mimic magnetic drag is inaccurate. We exhaustively lay down the theoretical formalism (dispersion relations, governing equations and time-dependent wave solutions) for a broad suite of models. In all situations, we derive the steady state of an atmosphere, which is relevant to interpreting infrared phase and eclipse maps of exoplanetary atmospheres. We elucidate a pinching effect that confines the atmospheric structure to be near the equator. Our suite of analytical models may be used to decisively develop physical intuition and as a reference point for three-dimensional, magnetohydrodynamic (MHD) simulations of atmospheric circulation.
[ { "created": "Wed, 29 Jan 2014 16:14:04 GMT", "version": "v1" }, { "created": "Tue, 3 Jun 2014 07:42:47 GMT", "version": "v2" } ]
2015-06-18
[ [ "Heng", "Kevin", "" ], [ "Workman", "Jared", "" ] ]
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1401.7574
Jie Sun
Jie Sun, Dane Taylor, and Erik M. Bollt
Causal Network Inference by Optimal Causation Entropy
null
SIAM J. Appl. Dyn. Syst. 14, 73-106 (2015)
10.1137/140956166
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The broad abundance of time series data, which is in sharp contrast to limited knowledge of the underlying network dynamic processes that produce such observations, calls for a rigorous and efficient method of causal network inference. Here we develop mathematical theory of causation entropy, an information-theoretic statistic designed for model-free causality inference. For stationary Markov processes, we prove that for a given node in the network, its causal parents forms the minimal set of nodes that maximizes causation entropy, a result we refer to as the optimal causation entropy principle. Furthermore, this principle guides us to develop computational and data efficient algorithms for causal network inference based on a two-step discovery and removal algorithm for time series data for a network-couple dynamical system. Validation in terms of analytical and numerical results for Gaussian processes on large random networks highlight that inference by our algorithm outperforms previous leading methods including conditioned Granger causality and transfer entropy. Interestingly, our numerical results suggest that the number of samples required for accurate inference depends strongly on network characteristics such as the density of links and information diffusion rate and not necessarily on the number of nodes.
[ { "created": "Wed, 29 Jan 2014 16:24:32 GMT", "version": "v1" }, { "created": "Sat, 16 May 2015 15:17:19 GMT", "version": "v2" } ]
2015-05-19
[ [ "Sun", "Jie", "" ], [ "Taylor", "Dane", "" ], [ "Bollt", "Erik M.", "" ] ]
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1401.7579
Daniel Colquitt
D. J. Colquitt, M. Brun, M. Gei, A. B. Movchan, N. V. Movchan, and I. S. Jones
Transformation elastodynamics and cloaking for flexural waves
18 pages, 6 figures
J Mech. Phys. Solids 72, 131-143 (2014)
10.1016/j.jmps.2014.07.014
null
physics.class-ph cond-mat.mtrl-sci math-ph math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The paper addresses an important issue of cloaking transformations for fourth-order partial differential equations representing flexural waves in thin elastic plates. It is shown that, in contrast with the Helmholtz equation, the general form of the partial differential equation is not invariant with respect to the cloaking transformation. The significant result of this paper is the analysis of the transformed equation and its interpretation in the framework of the linear theory of pre-stressed plates. The paper provides a formal framework for transformation elastodynamics as applied to elastic plates. Furthermore, an algorithm is proposed for designing a square cloak for flexural waves, which employs a regularised push-out transformation. Illustrative numerical examples show high accuracy and efficiency of the proposed cloaking algorithm. In particular, a physical configuration involving a perturbation of an interference pattern generated by two coherent sources is presented. It is demonstrated that the perturbation produced by a cloaked defect is negligibly small even for such a delicate interference pattern.
[ { "created": "Tue, 28 Jan 2014 17:01:26 GMT", "version": "v1" }, { "created": "Mon, 21 Dec 2015 10:24:30 GMT", "version": "v2" } ]
2015-12-22
[ [ "Colquitt", "D. J.", "" ], [ "Brun", "M.", "" ], [ "Gei", "M.", "" ], [ "Movchan", "A. B.", "" ], [ "Movchan", "N. V.", "" ], [ "Jones", "I. S.", "" ] ]
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1401.7583
Daniel Kulesz
Daniel Kulesz, Jan-Peter Ostberg
Practical Challenges with Spreadsheet Auditing Tools
13 Pages. 3 Detailed Colour Figures, Proc. European Spreadsheet Risks Int. Grp. (EuSpRIG) 2013, ISBN: 978-1-9054045-1-3
null
null
null
cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Just like other software, spreadsheets can contain significant faults. Static analysis is an accepted and well-established technique in software engineering known for its capability to discover faults. In recent years, a growing number of tool vendors started offering tools that allow casual end-users to run various static analyses on spreadsheets as well. We supervised a study where three undergraduate software engineering students examined a selection of 14 spreadsheet auditing tools, trying to give a concrete recommendation for an industry partner. Reflecting on the study's results, we found that most of these tools do provide useful aids in finding problems in spreadsheets, but we have also spotted several areas where tools had significant issues. Some of these issues could be remedied if spreadsheet auditing tool vendors would pick up some ideas of static analysis tools for traditional software development and adopt some of their solution approaches.
[ { "created": "Tue, 28 Jan 2014 20:51:32 GMT", "version": "v1" } ]
2014-01-30
[ [ "Kulesz", "Daniel", "" ], [ "Ostberg", "Jan-Peter", "" ] ]
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1401.7584
Michael Kohlhase
Michael Kohlhase, Corneliu Prodescu, Christian Liguda
XLSearch: A Search Engine for Spreadsheets
12 Pages. 10 B&W & Colour Figures. Proc. European Spreadsheet Risks Int. Grp. (EuSpRIG) 2013, ISBN: 978-1-9054045-1-3
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cs.DB
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Spreadsheets are end-user programs and domain models that are heavily employed in administration, financial forecasting, education, and science because of their intuitive, flexible, and direct approach to computation. As a result, institutions are swamped by millions of spreadsheets that are becoming increasingly difficult to manage, access, and control. This note presents the XLSearch system, a novel search engine for spreadsheets. It indexes spreadsheet formulae and efficiently answers formula queries via unification (a complex query language that allows metavariables in both the query as well as the index). But a web-based search engine is only one application of the underlying technology: Spreadsheet formula export to web standards like MathML combined with formula indexing can be used to find similar spreadsheets or common formula errors.
[ { "created": "Tue, 28 Jan 2014 20:38:05 GMT", "version": "v1" } ]
2014-01-30
[ [ "Kohlhase", "Michael", "" ], [ "Prodescu", "Corneliu", "" ], [ "Liguda", "Christian", "" ] ]
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1401.7585
Alexei D. Kiselev
Alexei D. Kiselev and Dmytro O. Plutenko
Mie scattering of Laguerre-Gaussian beams: photonic nanojets and near-field optical vortices
22 pages, 7 figures
null
10.1103/PhysRevA.89.043803
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study Mie scattering of Laguerre-Gaussian (LG) light beams remodelled using the method of far-field matching. The theoretical results are used to analyze the optical field in the near-field region for purely azimuthal LG beams characterized by a nonzero azimuthal mode number $m_{LG}$. The mode number $m_{LG}$ is found to have a profound effect on the morphology of photonic nanojets and the near-field structure of optical vortices associated with the components of the electric field.
[ { "created": "Wed, 29 Jan 2014 16:58:28 GMT", "version": "v1" } ]
2015-06-18
[ [ "Kiselev", "Alexei D.", "" ], [ "Plutenko", "Dmytro O.", "" ] ]
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1401.7586
Patrick O'Beirne
Patrick O'Beirne
Excel 2013 Spreadsheet Inquire
22 Pages with 23 large and highly detailed colour figures, Proc. European Spreadsheet Risks Int. Grp. (EuSpRIG) 2013, ISBN: 978-1-9054045-1-3
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cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Excel 2013 (version 15) includes an add-in "Inquire" for auditing spreadsheets. We describe the evolution of such tools in the third-party marketplace and assess the usefulness of Microsoft's own add-in in this context. We compare in detail the features of Inquire with similar products and make suggestions for how it could be enhanced. We offer a free helper add-in that in our opinion corrects one major shortcoming of Inquire.
[ { "created": "Tue, 28 Jan 2014 20:24:12 GMT", "version": "v1" } ]
2014-01-30
[ [ "O'Beirne", "Patrick", "" ] ]
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1401.7591
Luigi Laura
Camil Demetrescu and Irene Finocchi and Giuseppe F. Italiano and Luigi Laura
Experimental Evaluation of Algorithms for the Food-Selection Problem
This paper discuss the problem of eating good food in Rome :-) This is the latest version, the one that has been distributed to people participants of the SEA 2013 conference. Previous versions of this paper have been distributed to participants of FOCS 2004, CIAC 2006, ICTCS 2007, WEA 2007, WINE 2009, OPODIS 2012, and WSDM 2013
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cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we describe the result of our experiments on Algorithms for the Food-Selection Problem, which is the fundamental problem first stated and addressed in the seminal paper \cite{pigout}. Because the key aspect of any experimental evaluation is the \textbf{reproducibility}, we detail deeply the setup of all our experiments, thus leaving to the interested eater the opportunity to reproduce all the results described in this paper. More specifically, we describe all the answers we provided to the questions proposed in \cite{pigout}: Where can I have dinner tonight? What is the typical Roman cuisine that I should (not) miss? Where can I find the best coffee or gelato in town?
[ { "created": "Wed, 29 Jan 2014 17:09:12 GMT", "version": "v1" } ]
2014-01-30
[ [ "Demetrescu", "Camil", "" ], [ "Finocchi", "Irene", "" ], [ "Italiano", "Giuseppe F.", "" ], [ "Laura", "Luigi", "" ] ]
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1401.7592
Andreas Deschner
Andreas Deschner and Erik S. S{\o}rensen
Valence-Bond Quantum Monte Carlo Algorithms Defined on Trees
Final version, 13 pages, 11 figures
Phys. Rev. E 90, 033304 (2014)
10.1103/PhysRevE.90.033304
null
physics.comp-ph cond-mat.str-el
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a new class of algorithms for performing valence-bond quantum Monte Carlo of quantum spin models. Valence-bond quantum Monte Carlo is a T=0 Monte Carlo method based on sampling of a set of operator-strings that can be viewed as forming a tree-like structure. The algorithms presented here utilize the notion of a worm that moves up and down this tree and changes the associated operator-string. In quite general terms we derive a set of equations whose solutions correspond to a new class of algorithms. As specific examples of this class of algorithms we focus on two cases. The bouncing worm algorithm, for which updates are always accepted by allowing the worm to bounce up and down the tree and the driven worm algorithm, where a single parameter controls how far up the tree the worm reaches before turning around. The latter algorithm involves only a single bounce where the worm turns from going up the tree to going down. The presence of the control parameter necessitates the introduction of an acceptance probability for the update.
[ { "created": "Wed, 29 Jan 2014 17:10:51 GMT", "version": "v1" }, { "created": "Wed, 30 Apr 2014 10:53:48 GMT", "version": "v2" }, { "created": "Mon, 28 Jul 2014 12:51:50 GMT", "version": "v3" } ]
2014-09-16
[ [ "Deschner", "Andreas", "" ], [ "Sørensen", "Erik S.", "" ] ]
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1401.7594
Ching-Chi Lin
Ching-Chi Lin and Hai-Lun Tu
Linear-Time Algorithms for the Paired-Domination Problem in Interval Graphs and Circular-Arc Graphs
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null
null
null
cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In a graph $G$, a vertex subset $S\subseteq V(G)$ is said to be a dominating set of $G$ if every vertex not in $S$ is adjacent to a vertex in $S$. A dominating set $S$ of a graph $G$ is called a paired-dominating set if the induced subgraph $G[S]$ contains a perfect matching. The paired-domination problem involves finding a smallest paired-dominating set of $G$. Given an intersection model of an interval graph $G$ with sorted endpoints, Cheng et al. designed an $O(m+n)$-time algorithm for interval graphs and an $O(m(m+n))$-time algorithm for circular-arc graphs. In this paper, to solve the paired-domination problem in interval graphs, we propose an $O(n)$-time algorithm that searches for a minimum paired-dominating set of $G$ incrementally in a greedy manner. Then, we extend the results to design an algorithm for circular-arc graphs that also runs in $O(n)$ time.
[ { "created": "Wed, 29 Jan 2014 17:23:13 GMT", "version": "v1" } ]
2014-01-30
[ [ "Lin", "Ching-Chi", "" ], [ "Tu", "Hai-Lun", "" ] ]
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1401.7595
Yuri Litvinov
Thomas St\"ohlker, Yuri A. Litvinov, Angela Br\"auning-Demian, Michael Lestinsky, Frank Herfurth, Rudolf Maier, Dieter Prasuhn, Reinhold Schuch, Markus Steck (for the SPARC Collaboration)
SPARC Collaboration: New Strategy for Storage Ring Physics at FAIR
IX International Workshop on "APPLICATION OF LASERS AND STORAGE DEVICES IN ATOMIC NUCLEI RESEARCH", Recent Achievements and Future Prospects, May 13 - 16, 2013, Pozna\'n, Poland
null
10.1007/s10751-014-1047-2
null
physics.acc-ph physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
SPARC collaboration at FAIR pursues the worldwide unique research program by utilizing storage ring and trapping facilities for highly-charged heavy ions. The main focus is laid on the exploration of the physics at strong, ultra-short electromagnetic fields including the fundamental interactions between electrons and heavy nuclei as well as on the experiments at the border between nuclear and atomic physics. Very recently SPARC worked out a realization scheme for experiments with highly-charged heavy-ions at relativistic energies in the High-Energy Storage Ring HESR and at very low-energies at the CRYRING coupled to the present ESR. Both facilities provide unprecedented physics opportunities already at the very early stage of FAIR operation. The installation of CRYRING, dedicated Low-energy Storage Ring (LSR) for FLAIR, may even enable a much earlier realisation of the physics program of FLAIR with slow anti-protons.
[ { "created": "Wed, 29 Jan 2014 17:23:41 GMT", "version": "v1" } ]
2019-08-13
[ [ "Stöhlker", "Thomas", "", "for the SPARC Collaboration" ], [ "Litvinov", "Yuri A.", "", "for the SPARC Collaboration" ], [ "Bräuning-Demian", "Angela", "", "for the SPARC Collaboration" ], [ "Lestinsky", "Michael", "", "for the SPARC Collaboration" ], [ "Herfurth", "Frank", "", "for the SPARC Collaboration" ], [ "Maier", "Rudolf", "", "for the SPARC Collaboration" ], [ "Prasuhn", "Dieter", "", "for the SPARC Collaboration" ], [ "Schuch", "Reinhold", "", "for the SPARC Collaboration" ], [ "Steck", "Markus", "", "for the SPARC Collaboration" ] ]
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1401.7607
Marek Strumik
M. Strumik and S. Grzedzielski and A. Czechowski and W. M. Macek and R. Ratkiewicz
Advective transport of interstellar plasma into the heliosphere across the reconnecting heliopause
5 pages, 5 figures
The Astrophysical Journal Letters, 782, L7, 2014
10.1088/2041-8205/782/1/L7
null
astro-ph.SR physics.plasm-ph physics.space-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We discuss results of magnetohydrodynamical model simulations of plasma dynamics in the proximity of the heliopause (HP). The model is shown to fit details of the magnetic field variations observed by Voyager 1 spacecraft during the transition from the heliosphere to the local interstellar medium (LISM). We propose an interpretation of magnetic field structures observed by Voyager 1 in terms of fine-scale physical processes. Our simulations reveal an effective transport mechanism of relatively dense LISM plasma across the reconnecting HP into the heliosphere. The mechanism is associated with annihilation of magnetic sectors in the heliospheric plasma near the HP.
[ { "created": "Wed, 29 Jan 2014 17:42:27 GMT", "version": "v1" } ]
2014-01-30
[ [ "Strumik", "M.", "" ], [ "Grzedzielski", "S.", "" ], [ "Czechowski", "A.", "" ], [ "Macek", "W. M.", "" ], [ "Ratkiewicz", "R.", "" ] ]
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1401.7608
Tobias Grass
Tobias Gra\ss, Alessio Celi, Maciej Lewenstein
Quantum magnetism of ultracold atoms with a dynamical pseudospin degree of freedom
12 pages, 3 figures
Phys. Rev. A 90, 043628 (2014)
10.1103/PhysRevA.90.043628
null
cond-mat.quant-gas physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider bosons in a Hubbard lattice with an SU($\cal N$) pseudospin degree of freedom which is made dynamical via a coherent transfer term. It is shown that, in the basis which diagonalizes the pseudospin coupling, a generic hopping process affects the spin state, similar to a spin-orbit coupling. This results, for the system in the Mott phase, in a ferromagnetic phase with variable quantization axis. In extreme cases, it can even give rise to antiferromagnetic order.
[ { "created": "Wed, 29 Jan 2014 17:46:43 GMT", "version": "v1" } ]
2014-11-19
[ [ "Graß", "Tobias", "" ], [ "Celi", "Alessio", "" ], [ "Lewenstein", "Maciej", "" ] ]
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1401.7609
Caner Guclu
Caner Guclu, Mehdi Veysi, Ozdal Boyraz and Filippo Capolino
Optical Leaky-Wave Antenna Integrated in Ring Resonator
2 pages, 3 figures, conference
null
10.1109/APS.2014.6904966
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A leaky-wave antenna at optical frequencies is designed and integrated with a ring resonator at 1550 nm wavelength. The leaky wave is generated by using periodic perturbations in the integrated dielectric waveguide that excite the -1 spatial harmonic. The antenna consists of a dielectric waveguides with semiconductor corrugations, and it is compatible with CMOS fabrication technology. We show that integrating the leaky wave antenna in an optical ring resonator that is fed by directional couplers, we can improve the electronic control of the radiation through carrier injection into the semiconductor corrugations.
[ { "created": "Wed, 29 Jan 2014 17:50:05 GMT", "version": "v1" } ]
2015-03-26
[ [ "Guclu", "Caner", "" ], [ "Veysi", "Mehdi", "" ], [ "Boyraz", "Ozdal", "" ], [ "Capolino", "Filippo", "" ] ]
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1401.7612
Radek Erban
Jake P. Taylor-King, Benjamin Franz, Christian A. Yates and Radek Erban
Mathematical Modelling of Turning Delays in Swarm Robotics
Submitted to the IMA Journal of Applied Mathematics
null
null
null
cs.RO cs.SY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We investigate the effect of turning delays on the behaviour of groups of differential wheeled robots and show that the group-level behaviour can be described by a transport equation with a suitably incorporated delay. The results of our mathematical analysis are supported by numerical simulations and experiments with e-puck robots. The experimental quantity we compare to our revised model is the mean time for robots to find the target area in an unknown environment. The transport equation with delay better predicts the mean time to find the target than the standard transport equation without delay.
[ { "created": "Mon, 13 Jan 2014 03:54:46 GMT", "version": "v1" }, { "created": "Wed, 1 Oct 2014 03:16:40 GMT", "version": "v2" } ]
2014-10-02
[ [ "Taylor-King", "Jake P.", "" ], [ "Franz", "Benjamin", "" ], [ "Yates", "Christian A.", "" ], [ "Erban", "Radek", "" ] ]
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1401.7614
Amir H. Fatollahi
Maryam Hajirahimi, Fahimeh Mokhtari, Amir H. Fatollahi
New identities for sessile drops
1+12 pages, 4 tables, 7 figs
Applied Mathematics & Mechanics, 36 (2015) 293-302
10.1007/s10483-015-1916-6
null
physics.flu-dyn cond-mat.soft
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A new set of mathematical identities is presented for axi-symmetric sessile drops on flat and curved substrates. The geometrical parameters, including the apex curvature and height, and the contact radius, are related by the identities. The validity of the identities are checked by various numerical solutions both for flat and curved substrates.
[ { "created": "Tue, 28 Jan 2014 10:02:15 GMT", "version": "v1" } ]
2020-02-03
[ [ "Hajirahimi", "Maryam", "" ], [ "Mokhtari", "Fahimeh", "" ], [ "Fatollahi", "Amir H.", "" ] ]
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1401.7616
Michael Mitzenmacher
Michael Mitzenmacher
A New Approach to Analyzing Robin Hood Hashing
19 pages, draft version. Updated from the previous version with some new proofs, in particular a full proof of the log log n + O(1) maximum age bound in the static setting, by converting the fluid limit argument into a layered induction
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cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Robin Hood hashing is a variation on open addressing hashing designed to reduce the maximum search time as well as the variance in the search time for elements in the hash table. While the case of insertions only using Robin Hood hashing is well understood, the behavior with deletions has remained open. Here we show that Robin Hood hashing can be analyzed under the framework of finite-level finite-dimensional jump Markov chains. This framework allows us to re-derive some past results for the insertion-only case with some new insight, as well as provide a new analysis for a standard deletion model, where we alternate between deleting a random old key and inserting a new one. In particular, we show that a simple but apparently unstudied approach for handling deletions with Robin Hood hashing offers good performance even under high loads.
[ { "created": "Wed, 29 Jan 2014 18:31:36 GMT", "version": "v1" }, { "created": "Fri, 11 Jul 2014 01:27:08 GMT", "version": "v2" } ]
2014-07-14
[ [ "Mitzenmacher", "Michael", "" ] ]
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1401.7620
Francisco Ruiz
Francisco J. R. Ruiz, Isabel Valera, Carlos Blanco, Fernando Perez-Cruz
Bayesian nonparametric comorbidity analysis of psychiatric disorders
Submitted to Journal of Machine Learning Research
null
null
null
stat.ML cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The analysis of comorbidity is an open and complex research field in the branch of psychiatry, where clinical experience and several studies suggest that the relation among the psychiatric disorders may have etiological and treatment implications. In this paper, we are interested in applying latent feature modeling to find the latent structure behind the psychiatric disorders that can help to examine and explain the relationships among them. To this end, we use the large amount of information collected in the National Epidemiologic Survey on Alcohol and Related Conditions (NESARC) database and propose to model these data using a nonparametric latent model based on the Indian Buffet Process (IBP). Due to the discrete nature of the data, we first need to adapt the observation model for discrete random variables. We propose a generative model in which the observations are drawn from a multinomial-logit distribution given the IBP matrix. The implementation of an efficient Gibbs sampler is accomplished using the Laplace approximation, which allows integrating out the weighting factors of the multinomial-logit likelihood model. We also provide a variational inference algorithm for this model, which provides a complementary (and less expensive in terms of computational complexity) alternative to the Gibbs sampler allowing us to deal with a larger number of data. Finally, we use the model to analyze comorbidity among the psychiatric disorders diagnosed by experts from the NESARC database.
[ { "created": "Wed, 29 Jan 2014 18:46:38 GMT", "version": "v1" } ]
2014-01-30
[ [ "Ruiz", "Francisco J. R.", "" ], [ "Valera", "Isabel", "" ], [ "Blanco", "Carlos", "" ], [ "Perez-Cruz", "Fernando", "" ] ]
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null
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1401.7623
Alex Bronstein
Yonathan Aflalo, Alex Bronstein, Ron Kimmel
Graph matching: relax or not?
null
null
null
null
cs.DS cs.CG cs.CV math.OC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider the problem of exact and inexact matching of weighted undirected graphs, in which a bijective correspondence is sought to minimize a quadratic weight disagreement. This computationally challenging problem is often relaxed as a convex quadratic program, in which the space of permutations is replaced by the space of doubly-stochastic matrices. However, the applicability of such a relaxation is poorly understood. We define a broad class of friendly graphs characterized by an easily verifiable spectral property. We prove that for friendly graphs, the convex relaxation is guaranteed to find the exact isomorphism or certify its inexistence. This result is further extended to approximately isomorphic graphs, for which we develop an explicit bound on the amount of weight disagreement under which the relaxation is guaranteed to find the globally optimal approximate isomorphism. We also show that in many cases, the graph matching problem can be further harmlessly relaxed to a convex quadratic program with only n separable linear equality constraints, which is substantially more efficient than the standard relaxation involving 2n equality and n^2 inequality constraints. Finally, we show that our results are still valid for unfriendly graphs if additional information in the form of seeds or attributes is allowed, with the latter satisfying an easy to verify spectral characteristic.
[ { "created": "Wed, 29 Jan 2014 18:59:06 GMT", "version": "v1" }, { "created": "Sat, 1 Feb 2014 13:41:56 GMT", "version": "v2" }, { "created": "Thu, 6 Feb 2014 21:39:57 GMT", "version": "v3" }, { "created": "Mon, 10 Feb 2014 12:51:21 GMT", "version": "v4" }, { "created": "Sun, 12 Oct 2014 22:27:57 GMT", "version": "v5" } ]
2014-10-14
[ [ "Aflalo", "Yonathan", "" ], [ "Bronstein", "Alex", "" ], [ "Kimmel", "Ron", "" ] ]
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1401.7625
Aryan Mokhtari
Aryan Mokhtari and Alejandro Ribeiro
RES: Regularized Stochastic BFGS Algorithm
13 pages
null
10.1109/TSP.2014.2357775
null
cs.LG math.OC stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
RES, a regularized stochastic version of the Broyden-Fletcher-Goldfarb-Shanno (BFGS) quasi-Newton method is proposed to solve convex optimization problems with stochastic objectives. The use of stochastic gradient descent algorithms is widespread, but the number of iterations required to approximate optimal arguments can be prohibitive in high dimensional problems. Application of second order methods, on the other hand, is impracticable because computation of objective function Hessian inverses incurs excessive computational cost. BFGS modifies gradient descent by introducing a Hessian approximation matrix computed from finite gradient differences. RES utilizes stochastic gradients in lieu of deterministic gradients for both, the determination of descent directions and the approximation of the objective function's curvature. Since stochastic gradients can be computed at manageable computational cost RES is realizable and retains the convergence rate advantages of its deterministic counterparts. Convergence results show that lower and upper bounds on the Hessian egeinvalues of the sample functions are sufficient to guarantee convergence to optimal arguments. Numerical experiments showcase reductions in convergence time relative to stochastic gradient descent algorithms and non-regularized stochastic versions of BFGS. An application of RES to the implementation of support vector machines is developed.
[ { "created": "Wed, 29 Jan 2014 19:10:23 GMT", "version": "v1" } ]
2015-06-18
[ [ "Mokhtari", "Aryan", "" ], [ "Ribeiro", "Alejandro", "" ] ]
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