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1401.6904
Hanlei Wang
Hanlei Wang
Adaptive Visual Tracking for Robotic Systems Without Image-Space Velocity Measurement
21 pages, 3 figures, revised for making improvements based on the reviewers' and AE's comments from Automatica and for adding the journal reference
Automatica, 55: 294-301, May 2015
10.1016/j.automatica.2015.02.029
null
cs.RO cs.SY math.OC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we investigate the visual tracking problem for robotic systems without image-space velocity measurement, simultaneously taking into account the uncertainties of the camera model and the manipulator kinematics and dynamics. We propose a new image-space observer that exploits the image-space velocity information contained in the unknown kinematics, upon which, we design an adaptive controller without using the image-space velocity signal where the adaptations of the depth-rate-independent kinematic parameter and depth parameter are driven by both the image-space tracking errors and observation errors. The major superiority of the proposed observer-based adaptive controller lies in its simplicity and the separation of the handling of multiple uncertainties in visually servoed robotic systems, thus avoiding the overparametrization problem of the existing work. Using Lyapunov analysis, we demonstrate that the image-space tracking errors converge to zero asymptotically. The performance of the proposed adaptive control scheme is illustrated by a numerical simulation.
[ { "created": "Mon, 27 Jan 2014 15:56:28 GMT", "version": "v1" }, { "created": "Sat, 12 Apr 2014 11:22:39 GMT", "version": "v2" }, { "created": "Mon, 27 Apr 2015 18:42:55 GMT", "version": "v3" } ]
2015-06-15
[ [ "Wang", "Hanlei", "" ] ]
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1401.6911
Adrian Brown
Adrian J. Brown, Thomas J. Cudahy, Malcolm R. Walter
Hydrothermal alteration at the Panorama Formation, North Pole Dome, Pilbara Craton, Western Australia
29 pages, 9 figures, 2 tables
Precambrian Research (2006) 151, 211-223
10.1016/j.precamres.2006.08.014
null
astro-ph.EP physics.geo-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
An airborne hyperspectral remote sensing dataset was obtained of the North Pole Dome region of the Pilbara Craton in October 2002. It has been analyzed for indications of hydrothermal minerals. Here we report on the identification and mapping of hydrothermal minerals in the 3.459 Ga Panorama Formation and surrounding strata. The spatial distribution of a pattern of subvertical pyrophyllite rich veins connected to a pyrophyllite rich palaeohorizontal layer is interpreted to represent the base of an acid-sulfate epithermal system that is unconformably overlain by the stromatolitic 3.42 Ga Strelley Pool Chert.
[ { "created": "Fri, 24 Jan 2014 20:51:20 GMT", "version": "v1" } ]
2014-01-28
[ [ "Brown", "Adrian J.", "" ], [ "Cudahy", "Thomas J.", "" ], [ "Walter", "Malcolm R.", "" ] ]
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1401.6927
\'Agnes Vib\'ok
A. Perveaux, D. Lauvergnat, B. Lasorne, F. Gatti, M. A. Robb, G. J. Hal\'asz, and \'A. Vib\'ok
Attosecond electronic and nuclear quantum photodynamics of ozone: time-dependent Dyson orbitals and dipole
null
null
10.1088/0953-4075/47/12/124010
null
physics.atm-clus physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A nonadiabatic scheme for the description of the coupled electron and nuclear motions in the ozone molecule was proposed recently. An initial coherent nonstationary state was prepared as a superposition of the ground state and the excited Hartley band. In this situation neither the electrons nor the nuclei are in a stationary state. The multiconfiguration time dependent Hartree method was used to solve the coupled nuclear quantum dynamics in the framework of the adiabatic separation of the time-dependent Schr\"odinger equation. The resulting wave packet shows an oscillation of the electron density between the two chemical bonds. As a first step for probing the electronic motion we computed the time-dependent molecular dipole and the Dyson orbitals. The latter play an important role in the explanation of the photoelectron angular distribution. Calculations of the Dyson orbitals are presented both for the time-independent as well as the time-dependent situations. We limited our description of the electronic motion to the Franck-Condon region only due to the localization of the nuclear wave packets around this point during the first 5-6 fs.
[ { "created": "Mon, 27 Jan 2014 17:01:25 GMT", "version": "v1" } ]
2015-06-18
[ [ "Perveaux", "A.", "" ], [ "Lauvergnat", "D.", "" ], [ "Lasorne", "B.", "" ], [ "Gatti", "F.", "" ], [ "Robb", "M. A.", "" ], [ "Halász", "G. J.", "" ], [ "Vibók", "Á.", "" ] ]
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1401.6929
Wojciech Wislicki
W. Wi\'slicki, T. Bednarski, P. Bia{\l}as, E. Czerwi\'nski, {\L}. Kap{\l}on, A. Kochanowski, G. Korcyl, J. Kowal, P. Kowalski, T. Kozik, W. Krzemie\'n, M. Molenda, P. Moskal, S. Nied\'zwiecki, M. Pa{\l}ka, M. Pawlik, L. Raczy\'nski, Z. Rudy, P. Salabura, N.G. Sharma, M. Silarski, A. S{\l}omski, J. Smyrski, A. Strzelecki, A. Wieczorek, M. Zieli\'nski, N. Zo\'n
Computing support for advanced medical data analysis and imaging
9 p, 3 figs, based on talk given at Symposium on Positron Emission Tomography, Sept. 19-22, 2013, Jagiellonian University, Krak\'ow, Pl
Bio-Algorithms and Med-Systems 10(2014)52
10.1515/bams-2014-0001
null
physics.comp-ph cs.CV cs.DC physics.ins-det physics.med-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We discuss computing issues for data analysis and image reconstruction of PET-TOF medical scanner or other medical scanning devices producing large volumes of data. Service architecture based on the grid and cloud concepts for distributed processing is proposed and critically discussed.
[ { "created": "Mon, 27 Jan 2014 17:02:37 GMT", "version": "v1" } ]
2014-05-27
[ [ "Wiślicki", "W.", "" ], [ "Bednarski", "T.", "" ], [ "Białas", "P.", "" ], [ "Czerwiński", "E.", "" ], [ "Kapłon", "Ł.", "" ], [ "Kochanowski", "A.", "" ], [ "Korcyl", "G.", "" ], [ "Kowal", "J.", "" ], [ "Kowalski", "P.", "" ], [ "Kozik", "T.", "" ], [ "Krzemień", "W.", "" ], [ "Molenda", "M.", "" ], [ "Moskal", "P.", "" ], [ "Niedźwiecki", "S.", "" ], [ "Pałka", "M.", "" ], [ "Pawlik", "M.", "" ], [ "Raczyński", "L.", "" ], [ "Rudy", "Z.", "" ], [ "Salabura", "P.", "" ], [ "Sharma", "N. G.", "" ], [ "Silarski", "M.", "" ], [ "Słomski", "A.", "" ], [ "Smyrski", "J.", "" ], [ "Strzelecki", "A.", "" ], [ "Wieczorek", "A.", "" ], [ "Zieliński", "M.", "" ], [ "Zoń", "N.", "" ] ]
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1401.6931
David Shepherd
Xi Ge, David Shepherd, Kostadin Damevski, Emerson Murphy-Hill
How the Sando Search Tool Recommends Queries
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cs.SE cs.IR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Developers spend a significant amount of time searching their local codebase. To help them search efficiently, researchers have proposed novel tools that apply state-of-the-art information retrieval algorithms to retrieve relevant code snippets from the local codebase. However, these tools still rely on the developer to craft an effective query, which requires that the developer is familiar with the terms contained in the related code snippets. Our empirical data from a state-of-the-art local code search tool, called Sando, suggests that developers are sometimes unacquainted with their local codebase. In order to bridge the gap between developers and their ever-increasing local codebase, in this paper we demonstrate the recommendation techniques integrated in Sando.
[ { "created": "Mon, 27 Jan 2014 17:05:37 GMT", "version": "v1" } ]
2014-01-28
[ [ "Ge", "Xi", "" ], [ "Shepherd", "David", "" ], [ "Damevski", "Kostadin", "" ], [ "Murphy-Hill", "Emerson", "" ] ]
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1401.6943
Guillaume Riboux
Guillaume Riboux and Jos\'e Manuel Gordillo
The critical impact speed for the splash of a drop
13 pages, 13 figures
null
null
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Making use of experimental and theoretical considerations, in this Letter we deduce a criterion to determine the critical velocity for which a drop impacting a smooth dry surface either spreads over the substrate or disintegrates into smaller droplets. The derived equation, which expresses the splash threshold velocity as a function of the material properties of the two fluids involved, the drop radius and the mean free path of the molecules composing the surrounding gaseous atmosphere, has been thoroughly validated experimentally at normal atmospheric conditions using eight different liquids, with viscosities ranging from $3\times 10^{-4}$ to $10^{-2}$ Pa$\cdot$s and interfacial tension coefficients which vary between $17$ and $72$ mN$\cdot$m$^{-1}$.
[ { "created": "Mon, 27 Jan 2014 17:49:10 GMT", "version": "v1" }, { "created": "Mon, 10 Mar 2014 12:40:17 GMT", "version": "v2" }, { "created": "Fri, 28 Mar 2014 11:40:59 GMT", "version": "v3" } ]
2014-03-31
[ [ "Riboux", "Guillaume", "" ], [ "Gordillo", "José Manuel", "" ] ]
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1401.6946
Pierluigi Poggiolini
A. Carena, G. Bosco, V. Curri, Y. Jiang, P. Poggiolini, F. Forghieri
On the Accuracy of the GN-Model and on Analytical Correction Terms to Improve It
This paper has been accepted for publication on OSA Optics Express, with the title: "The EGN model of nonlinear fiber propagation"
null
null
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The GN-model has been proposed as an approximate but sufficiently accurate tool for predicting uncompensated optical coherent transmission system performance, in realistic scenarios. For this specific use, the GN-model has enjoyed substantial validation, both simulative and experimental. Recently, however, it has been pointed out that its predictions, when used to obtain a detailed picture of non-linear interference (NLI) noise accumulation along a link, may be affected by a substantial NLI overestimation error, especially in the first spans of the link. In this paper we analyze in detail the GN-model errors. We discuss recently proposed formulas for correcting such errors and show that they neglect several contributions to NLI, so that they may substantially underestimate NLI in specific situations, especially over low-dispersion fibers. We derive a complete set of formulas accounting for all single, cross, and multi-channel effects, this set constitutes what we have called the enhanced GN-model (EGN-model). We extensively validate the EGN model by comparison with accurate simulations in several different system scenarios. The overall EGN model accuracy is found to be very good when assessing detailed span-by-span NLI accumulation and excellent when estimating realistic system maximum reach. The computational complexity vs. accuracy trade-offs of the various versions of the GN and EGN models are extensively discussed.
[ { "created": "Mon, 27 Jan 2014 18:02:22 GMT", "version": "v1" }, { "created": "Tue, 4 Mar 2014 17:16:59 GMT", "version": "v2" }, { "created": "Thu, 13 Mar 2014 01:10:02 GMT", "version": "v3" }, { "created": "Fri, 21 Mar 2014 17:53:10 GMT", "version": "v4" }, { "created": "Thu, 27 Mar 2014 13:43:51 GMT", "version": "v5" }, { "created": "Tue, 1 Apr 2014 09:17:41 GMT", "version": "v6" }, { "created": "Fri, 6 Jun 2014 11:08:11 GMT", "version": "v7" } ]
2014-06-09
[ [ "Carena", "A.", "" ], [ "Bosco", "G.", "" ], [ "Curri", "V.", "" ], [ "Jiang", "Y.", "" ], [ "Poggiolini", "P.", "" ], [ "Forghieri", "F.", "" ] ]
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1401.6951
Asim Ghosh
Asim Ghosh, Nachiketa Chattopadhyay, Bikas K. Chakrabarti
Inequality in Societies, Academic Institutions and Science Journals: Gini and k-indices
5 pages, 3 figures
Physica A 410 (2014) 30-34
10.1016/j.physa.2014.05.026
null
physics.soc-ph cs.DL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Social inequality is traditionally measured by the Gini-index ($g$). The $g$-index takes values from $0$ to $1$ where $g=0$ represents complete equality and $g=1$ represents complete inequality. Most of the estimates of the income or wealth data indicate the $g$ value to be widely dispersed across the countries of the world: \textit{g} values typically range from $0.30$ to $0.65$ at a particular time (year). We estimated similarly the Gini-index for the citations earned by the yearly publications of various academic institutions and the science journals. The ISI web of science data suggests remarkably strong inequality and universality ($g=0.70\pm0.07$) across all the universities and institutions of the world, while for the journals we find $g=0.65\pm0.15$ for any typical year. We define a new inequality measure, namely the $k$-index, saying that the cumulative income or citations of ($1-k$) fraction of people or papers exceed those earned by the fraction ($k$) of the people or publications respectively. We find, while the $k$-index value for income ranges from $0.60$ to $0.75$ for income distributions across the world, it has a value around $0.75\pm0.05$ for different universities and institutions across the world and around $0.77\pm0.10$ for the science journals. Apart from above indices, we also analyze the same institution and journal citation data by measuring Pietra index and median index.
[ { "created": "Mon, 27 Jan 2014 18:26:12 GMT", "version": "v1" }, { "created": "Tue, 28 Jan 2014 18:09:18 GMT", "version": "v2" }, { "created": "Tue, 6 May 2014 08:39:07 GMT", "version": "v3" }, { "created": "Thu, 8 May 2014 19:18:13 GMT", "version": "v4" }, { "created": "Mon, 26 May 2014 15:12:44 GMT", "version": "v5" } ]
2014-05-27
[ [ "Ghosh", "Asim", "" ], [ "Chattopadhyay", "Nachiketa", "" ], [ "Chakrabarti", "Bikas K.", "" ] ]
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1401.6954
Miao Yu
Miao Yu and Hao Lin
Quantification of propidium iodide delivery with millisecond electric pulses: A model study
null
null
null
null
physics.bio-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A model study of propidium iodide delivery with millisecond electric pulses is presented; this work is a companion of the experimental efforts by Sadik et al. [1]. Both membrane permeabilization and delivery are examined with respect to six extra-cellular conductivities. The transmembrane potential of the permeabilized regions exhibits a consistent value, which corresponds to a bifurcation point in the pore-radius-potential relation. Both the pore area density and membrane conductance increase with an increasing extra-cellular conductivity. On the other hand, the inverse correlation between propidium iodide delivery and extra-cellular conductivity as observed in the experiments is quantitatively captured by the model. This agreement confirms that this behavior is primarily mediated by electrophoretic transport during the pulse. The results suggest that electrophoresis is important even for the delivery of small molecules such as propidium iodide. The direct comparison between model prediction and experimental data presented in this work helps validate the former as a robust predictive tool for the study of electroporation.
[ { "created": "Mon, 27 Jan 2014 18:40:11 GMT", "version": "v1" } ]
2014-01-28
[ [ "Yu", "Miao", "" ], [ "Lin", "Hao", "" ] ]
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1401.6956
Joon Kwon
Joon Kwon and Panayotis Mertikopoulos
A continuous-time approach to online optimization
null
null
null
null
math.OC cs.LG stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider a family of learning strategies for online optimization problems that evolve in continuous time and we show that they lead to no regret. From a more traditional, discrete-time viewpoint, this continuous-time approach allows us to derive the no-regret properties of a large class of discrete-time algorithms including as special cases the exponential weight algorithm, online mirror descent, smooth fictitious play and vanishingly smooth fictitious play. In so doing, we obtain a unified view of many classical regret bounds, and we show that they can be decomposed into a term stemming from continuous-time considerations and a term which measures the disparity between discrete and continuous time. As a result, we obtain a general class of infinite horizon learning strategies that guarantee an $\mathcal{O}(n^{-1/2})$ regret bound without having to resort to a doubling trick.
[ { "created": "Mon, 27 Jan 2014 18:45:54 GMT", "version": "v1" }, { "created": "Thu, 27 Feb 2014 14:36:01 GMT", "version": "v2" } ]
2014-02-28
[ [ "Kwon", "Joon", "" ], [ "Mertikopoulos", "Panayotis", "" ] ]
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1401.6961
Matt Challacombe
Matt Challacombe and Nicolas Bock
An N-Body Solution to the Problem of Fock Exchange
5 pages, 2 figures
null
10.1063/1.4868636
LA-UR-14-20354
cs.DS
http://creativecommons.org/licenses/by/3.0/
We report an N-Body approach to computing the Fock exchange matrix with and without permutational symmetry. The method achieves an O(N lg N) computational complexity through an embedded metric-query, allowing hierarchical application of direct SCF criteria. The advantages of permutational symmetry are found to be 4-fold for small systems, but decreasing with increasing system size and/or more permissive neglect criteria. This work sets the stage for: (1) the introduction of range queries in multi-level multipole schemes for rank reduction, and (2) recursive task parallelism.
[ { "created": "Mon, 27 Jan 2014 18:56:47 GMT", "version": "v1" } ]
2015-06-18
[ [ "Challacombe", "Matt", "" ], [ "Bock", "Nicolas", "" ] ]
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1401.6962
Hugo Reboredo
Hugo Reboredo, Francesco Renna, Robert Calderbank, Miguel R. D. Rodrigues
Compressive Classification of a Mixture of Gaussians: Analysis, Designs and Geometrical Interpretation
38 pages, 7 figures. Submitted for publication in IEEE Transactions on Information Theory
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null
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cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper derives fundamental limits on the performance of compressive classification when the source is a mixture of Gaussians. It provides an asymptotic analysis of a Bhattacharya based upper bound on the misclassification probability for the optimal Maximum-A-Posteriori (MAP) classifier that depends on quantities that are dual to the concepts of diversity-order and coding gain in multi-antenna communications. The diversity-order of the measurement system determines the rate at which the probability of misclassification decays with signal-to-noise ratio (SNR) in the low-noise regime. The counterpart of coding gain is the measurement gain which determines the power offset of the probability of misclassification in the low-noise regime. These two quantities make it possible to quantify differences in misclassification probability between random measurement and (diversity-order) optimized measurement. Results are presented for two-class classification problems first with zero-mean Gaussians then with nonzero-mean Gaussians, and finally for multiple-class Gaussian classification problems. The behavior of misclassification probability is revealed to be intimately related to certain fundamental geometric quantities determined by the measurement system, the source and their interplay. Numerical results, representative of compressive classification of a mixture of Gaussians, demonstrate alignment of the actual misclassification probability with the Bhattacharya based upper bound. The connection between the misclassification performance and the alignment between source and measurement geometry may be used to guide the design of dictionaries for compressive classification.
[ { "created": "Mon, 27 Jan 2014 18:57:59 GMT", "version": "v1" } ]
2014-01-28
[ [ "Reboredo", "Hugo", "" ], [ "Renna", "Francesco", "" ], [ "Calderbank", "Robert", "" ], [ "Rodrigues", "Miguel R. D.", "" ] ]
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1401.6963
Fern Hunt Dr
Fern Y. Hunt
Optimal Spread in Network Consensus Models
6 pages, 4 figures. This paper replaces an earlier version. The entire paper has been rewritten. In addition to the results of the previous version, a normalized submodular function is introduced and is used to obtain a performance ratio for our algorithm. We also provide a comparison with the approximation obtained using the greedy algorithm
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cs.DM cs.DS
http://creativecommons.org/publicdomain/zero/1.0/
In a model of network communication based on a random walk in an undirected graph, what subset of nodes (subject to constraints on the set size), enable the fastest spread of information? The dynamics of spread is described by a process dual to the movement from informed to uninformed nodes. In this setting, an optimal set $A$ minimizes the sum of the expected first hitting times $F(A)$, of random walks that start at nodes outside the set. In this paper,the problem is reformulated so that the search for solutions is restricted to a class of optimal and "near" optimal subsets of the graph. We introduce a submodular, non-decreasing rank function $\rho$, that permits some comparison between the solution obtained by the classical greedy algorithm and one obtained by our methods. The supermodularity and non-increasing properties of $F$ are used to show that the rank of our solution is at least $(1-\frac{1}{e})$ times the rank of the optimal set. When the solution has a higher rank than the greedy solution this constant can be improved to $(1-\frac{1}{e})(1+\chi)$ where $\chi >0$ is determined a posteriori. The method requires the evaluation of $F$ for sets of some fixed cardinality $m$, where $m$ is much smaller than the cardinality of the optimal set. When $F$ has forward elemental curvature $\kappa$, we can provide a rough description of the trade-off between solution quality and computational effort $m$ in terms of $\kappa$.
[ { "created": "Mon, 27 Jan 2014 19:00:44 GMT", "version": "v1" }, { "created": "Fri, 31 Jan 2014 14:30:29 GMT", "version": "v2" }, { "created": "Thu, 7 May 2015 17:46:17 GMT", "version": "v3" }, { "created": "Mon, 22 Feb 2016 17:13:35 GMT", "version": "v4" } ]
2016-02-23
[ [ "Hunt", "Fern Y.", "" ] ]
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1401.6964
Dmitry Zinoviev
Dmitry Zinoviev and Sarah Llewelyn
Co-Evolution of Friendship and Publishing in Online Blogging Social Networks
6 pages, 7 figures. Has been presented as a poster at WebSci-2012
null
null
null
cs.SI physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In the past decade, blogging web sites have become more sophisticated and influential than ever. Much of this sophistication and influence follows from their network organization. Blogging social networks (BSNs) allow individual bloggers to form contact lists, subscribe to other blogs, comment on blog posts, declare interests, and participate in collective blogs. Thus, a BSN is a bimodal venue, where users can engage in publishing (post) as well as in social (make friends) activities. In this paper, we study the co-evolution of both activities. We observed a significant positive correlation between blogging and socializing. In addition, we identified a number of user archetypes that correspond to "mainly bloggers," "mainly socializers," etc. We analyzed a BSN at the level of individual posts and changes in contact lists and at the level of trajectories in the friendship-publishing space. Both approaches produced consistent results: the majority of BSN users are passive readers; publishing is the dominant active behavior in a BSN; and social activities complement blogging, rather than compete with it.
[ { "created": "Mon, 27 Jan 2014 20:43:23 GMT", "version": "v1" } ]
2014-01-28
[ [ "Zinoviev", "Dmitry", "" ], [ "Llewelyn", "Sarah", "" ] ]
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1401.6966
Roman Pechhacker
R. Pechhacker and D. Tsiklauri
3D particle-in-cell simulation of electron acceleration by Langmuir waves in an inhomogeneous plasma
null
Phys. Plasmas 21, 012903 (2014)
10.1063/1.4863494
null
astro-ph.SR physics.plasm-ph physics.space-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A possible solution to the unexplained high intensity hard x-ray (HXR) emission observable during solar flares was investigated via 3D fully relativistic, electromagnetic particle-in-cell (PIC) simulations with realistic ion to electron mass ratio. A beam of accelerated electrons was injected into a magnetised, Maxwellian, homogeneous and inhomogeneous background plasma. The electron distribution function was unstable to the beam-plasma instability and was shown to generate Langmuir waves, while relaxing to plateau formation. In order to estimate the role of the background density gradient on an unbound (infinite spatial extent) beam, three different scenarios were investigated: a) a uniform density background; b) a weak density gradient, n_R/n_L=3; c) a strong gradient case, n_R/n_L=10, where n_R and n_L denote background electron densities on the left and right edges of the simulation box respectively. The strong gradient case produced the largest fraction of electrons beyond 15 v_th. Further, two cases (uniform and strong gradient background) with spatially localized beam injections were performed aiming to show drifts of the generated Langmuir wave wavenumbers, as suggested in previous studies. For the strong gradient case, the Langmuir wave power is shown to drift to smaller wavenumbers, as found in previous quasi-linear simulations.
[ { "created": "Mon, 27 Jan 2014 19:11:08 GMT", "version": "v1" } ]
2014-04-09
[ [ "Pechhacker", "R.", "" ], [ "Tsiklauri", "D.", "" ] ]
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1401.6967
A. I. Nikishov
A.I Nikishov
How much weigh a pound in gravitational field
3 pages, no figures
null
null
null
physics.gen-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The force in the equation of motion of a particle should be in accordance with energy conservation in a constant gravitational field. It turns out that this is possible only if the force is given by the change of momentum per unit of coordinate (not proper) time. We discuss the consequences of this fact. In particular it turns out that the spring balance, which keeps the body at rest in (strong) gravitation field, shows the finite value even at infinitely close approach to horizons of black holes, if they exist in Nature.
[ { "created": "Wed, 22 Jan 2014 11:16:11 GMT", "version": "v1" } ]
2014-01-28
[ [ "Nikishov", "A. I", "" ] ]
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1401.6968
Anastasios Kyrillidis
Anastasios Kyrillidis and George N. Karystinos
Fixed-rank Rayleigh Quotient Maximization by an $M$PSK Sequence
15 pages, 12 figures, To appear in IEEE Transactions on Communications
null
null
null
cs.IT math.CO math.IT math.OC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Certain optimization problems in communication systems, such as limited-feedback constant-envelope beamforming or noncoherent $M$-ary phase-shift keying ($M$PSK) sequence detection, result in the maximization of a fixed-rank positive semidefinite quadratic form over the $M$PSK alphabet. This form is a special case of the Rayleigh quotient of a matrix and, in general, its maximization by an $M$PSK sequence is $\mathcal{NP}$-hard. However, if the rank of the matrix is not a function of its size, then the optimal solution can be computed with polynomial complexity in the matrix size. In this work, we develop a new technique to efficiently solve this problem by utilizing auxiliary continuous-valued angles and partitioning the resulting continuous space of solutions into a polynomial-size set of regions, each of which corresponds to a distinct $M$PSK sequence. The sequence that maximizes the Rayleigh quotient is shown to belong to this polynomial-size set of sequences, thus efficiently reducing the size of the feasible set from exponential to polynomial. Based on this analysis, we also develop an algorithm that constructs this set in polynomial time and show that it is fully parallelizable, memory efficient, and rank scalable. The proposed algorithm compares favorably with other solvers for this problem that have appeared recently in the literature.
[ { "created": "Mon, 27 Jan 2014 19:59:31 GMT", "version": "v1" } ]
2014-01-28
[ [ "Kyrillidis", "Anastasios", "" ], [ "Karystinos", "George N.", "" ] ]
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1401.6971
Bhupesh Bishnoi
Tangudu Bharat Kumar, Bhaskar Awadhiya, E.MeherAbhinav, Bahniman Ghosh and Bhupesh Bishnoi
Performance Analysis of Spin Transfer Torque Random Access Memory with cross shaped free layer using Heusler Alloys by using micromagnetic studies
7 pages, 6 figures
null
null
null
cs.ET
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We investigated the performance of spin transfer torque random access memory (STT-RAM) cell with cross shaped Heusler compound based free layer using micromagnetic simulations. We designed the free layer using Cobalt based Heusler compounds. Here in this paper, simulation results predict that switching time from one state to other state is reduced. Also it is examined that critical switching current density to switch the magnetization of free layer of STT RAM cell is reduced.
[ { "created": "Fri, 24 Jan 2014 17:55:26 GMT", "version": "v1" } ]
2014-01-28
[ [ "Kumar", "Tangudu Bharat", "" ], [ "Awadhiya", "Bhaskar", "" ], [ "MeherAbhinav", "E.", "" ], [ "Ghosh", "Bahniman", "" ], [ "Bishnoi", "Bhupesh", "" ] ]
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1401.6975
Nicolas Delfosse
Nicolas Delfosse, Jean-Pierre Tillich
A decoding algorithm for CSS codes using the X/Z correlations
10 pages
IEEE International Symposium on Information Theory - ISIT 2014, pp.1071-1075
10.1109/ISIT.2014.6874997
null
cs.IT math.IT quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose a simple decoding algorithm for CSS codes taking into account the correlations between the X part and the Z part of the error. Applying this idea to surface codes, we derive an improved version of the perfect matching decoding algorithm which uses these X/Z correlations.
[ { "created": "Mon, 27 Jan 2014 19:32:59 GMT", "version": "v1" } ]
2016-11-29
[ [ "Delfosse", "Nicolas", "" ], [ "Tillich", "Jean-Pierre", "" ] ]
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1401.6981
Nicolas Kourtellis Ph.D.
Nicolas Kourtellis, Gianmarco De Francisci Morales, Francesco Bonchi
Scalable Online Betweenness Centrality in Evolving Graphs
15 pages, 9 Figures, accepted for publication in IEEE Transactions on Knowledge and Data Engineering
null
null
null
cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Betweenness centrality is a classic measure that quantifies the importance of a graph element (vertex or edge) according to the fraction of shortest paths passing through it. This measure is notoriously expensive to compute, and the best known algorithm runs in O(nm) time. The problems of efficiency and scalability are exacerbated in a dynamic setting, where the input is an evolving graph seen edge by edge, and the goal is to keep the betweenness centrality up to date. In this paper we propose the first truly scalable algorithm for online computation of betweenness centrality of both vertices and edges in an evolving graph where new edges are added and existing edges are removed. Our algorithm is carefully engineered with out-of-core techniques and tailored for modern parallel stream processing engines that run on clusters of shared-nothing commodity hardware. Hence, it is amenable to real-world deployment. We experiment on graphs that are two orders of magnitude larger than previous studies. Our method is able to keep the betweenness centrality measures up to date online, i.e., the time to update the measures is smaller than the inter-arrival time between two consecutive updates.
[ { "created": "Mon, 27 Jan 2014 19:50:47 GMT", "version": "v1" }, { "created": "Tue, 28 Apr 2015 16:22:52 GMT", "version": "v2" } ]
2015-04-29
[ [ "Kourtellis", "Nicolas", "" ], [ "Morales", "Gianmarco De Francisci", "" ], [ "Bonchi", "Francesco", "" ] ]
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Scalable Online Betweenness Centrality in Evolving Graphs
http://arxiv.org/abs/1401.6981v2
http://arxiv.org/pdf/1401.6981v2.pdf
https://github.com/nicolas-kourtellis/StreamingBetweenness
true
true
https://paperswithcode.com/paper/scalable-online-betweenness-centrality-in
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1401.6982
Nicola Perra
Fabio Ciulla, Nicola Perra, Andrea Baronchelli, Alessandro Vespignani
Damage detection via shortest path network sampling
null
null
10.1103/PhysRevE.89.052816
null
physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Large networked systems are constantly exposed to local damages and failures that can alter their functionality. The knowledge of the structure of these systems is however often derived through sampling strategies whose effectiveness at damage detection has not been thoroughly investigated so far. Here we study the performance of shortest path sampling for damage detection in large scale networks. We define appropriate metrics to characterize the sampling process before and after the damage, providing statistical estimates for the status of nodes (damaged, not-damaged). The proposed methodology is flexible and allows tuning the trade-off between the accuracy of the damage detection and the number of probes used to sample the network. We test and measure the efficiency of our approach considering both synthetic and real networks data. Remarkably, in all the systems studied the number of correctly identified damaged nodes exceeds the number false positives allowing to uncover precisely the damage.
[ { "created": "Mon, 27 Jan 2014 19:53:29 GMT", "version": "v1" }, { "created": "Wed, 29 Jan 2014 19:35:02 GMT", "version": "v2" } ]
2015-06-18
[ [ "Ciulla", "Fabio", "" ], [ "Perra", "Nicola", "" ], [ "Baronchelli", "Andrea", "" ], [ "Vespignani", "Alessandro", "" ] ]
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1401.6984
Yajie Miao
Yajie Miao
Kaldi+PDNN: Building DNN-based ASR Systems with Kaldi and PDNN
unpublished manuscript
null
null
null
cs.LG cs.CL
http://creativecommons.org/licenses/by-nc-sa/3.0/
The Kaldi toolkit is becoming popular for constructing automated speech recognition (ASR) systems. Meanwhile, in recent years, deep neural networks (DNNs) have shown state-of-the-art performance on various ASR tasks. This document describes our open-source recipes to implement fully-fledged DNN acoustic modeling using Kaldi and PDNN. PDNN is a lightweight deep learning toolkit developed under the Theano environment. Using these recipes, we can build up multiple systems including DNN hybrid systems, convolutional neural network (CNN) systems and bottleneck feature systems. These recipes are directly based on the Kaldi Switchboard 110-hour setup. However, adapting them to new datasets is easy to achieve.
[ { "created": "Mon, 27 Jan 2014 19:55:34 GMT", "version": "v1" } ]
2014-01-28
[ [ "Miao", "Yajie", "" ] ]
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1401.6988
Marcos Portnoi
Marcos Portnoi
Criptografia com Curvas El\'ipticas
Portuguese, 14 pages
null
null
null
cs.CR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper presents an overview of the use of elliptic curves in cryptography. The security of this cryptosystem is based on the discrete logarithm problem, which appears to be much harder compared to the discrete logarithm problem in other cryptosystems. An overview of common cryptosystems is given, such as Diffie-Hellman and RSA, and an elliptic curve cryptography scheme is discussed. -------- Este trabalho apresenta o uso das curvas el\'ipticas em criptografia. Sua seguran\c{c}a est\'a baseada no problema do logaritmo discreto. Este problema aparentemente \'e significativamente mais dif\'icil de resolver, comparado com o problema do logaritmo discreto usado por outros sistemas de criptografia. \'E dada uma vis\~ao geral de sistemas de criptografia comuns, como Diffie-Hellman e RSA, e discute-se um esquema de criptografia usando curvas el\'ipticas.
[ { "created": "Mon, 27 Jan 2014 20:15:17 GMT", "version": "v1" } ]
2014-01-28
[ [ "Portnoi", "Marcos", "" ] ]
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1401.6995
Jerry Vavra
J.Va'vra
What is needed to accept the new explanation of DAMA results
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null
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astro-ph.IM physics.ins-det
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The DAMA experiment clearly observes a small oscillatory signal. The observed yearly modulation is in phase with the Earth's motion around the Sun. Recent reference [Vavra, 2014] suggested that the DAMA experiment observes a WIMP of much smaller mass than what Xenon 10, Xenon 100, LUX and CDMS experiments can possibly reach. Scattering would occur on proton or oxygen target present in the NaI(Tl) crystal as OH-contamination at a few ppm level. This paper elaborates further on the idea that the OH-molecule could act as a very sensitive detection mechanism for neutrons or WIMPs, and suggests a calibration procedure to prove this idea. We also propose a new detector concept to detect a low mass WIMP.
[ { "created": "Mon, 27 Jan 2014 20:32:37 GMT", "version": "v1" } ]
2014-01-28
[ [ "Va'vra", "J.", "" ] ]
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1401.6999
Yulia Emelianova
Yulia P. Emelianova, Valeriy V. Emelyanov, Nikita M. Ryskin
Synchronization of two coupled multimode oscillators with time-delayed feedback
19 pages, 10 figures
null
10.1016/j.cnsns.2014.03.031
null
nlin.CD physics.comp-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Effects of synchronization in a system of two coupled oscillators with time-delayed feedback are investigated. Phase space of a system with time delay is infinite-dimensional. Thus, the picture of synchronization in such systems acquires many new features not inherent to finite-dimensional ones. A picture of oscillation modes in cases of identical and non-identical coupled oscillators is studied in detail. Periodical structure of amplitude death and "broadband synchronization" zones is investigated. Such a behavior occurs due to the resonances between different modes of the infinite-dimensional system with time delay.
[ { "created": "Mon, 27 Jan 2014 20:46:17 GMT", "version": "v1" }, { "created": "Wed, 29 Jan 2014 08:14:35 GMT", "version": "v2" }, { "created": "Sat, 3 May 2014 09:08:15 GMT", "version": "v3" } ]
2014-05-06
[ [ "Emelianova", "Yulia P.", "" ], [ "Emelyanov", "Valeriy V.", "" ], [ "Ryskin", "Nikita M.", "" ] ]
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1401.7002
Matthew Wright PhD
Nabila Rahman, Matthew Wright, Donggang Liu
Fast and energy-efficient technique for jammed region mapping in wireless sensor networks
8 pages, 5 figures
null
null
null
cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Wireless sensor networks (WSNs) have great practical importance for surveillance systems to perform monitoring by acquiring and sending information on any intrusion in a secured area. Requirement of very little human intervention is one of the most desirable features of WSNs, thus making it a cheaper and safer alternative for securing large areas such as international borders. Jamming attacks in WSNs can be applied to disrupt communications among the sensor nodes in the network. Since it is difficult to prevent jamming attacks, detection and mapping out the jammed regions is critical to overcome this problem. In a security monitoring scenario, the network operators will be able to take proper measures against jamming once the jammed regions in the network are known to them. It is also desirable to keep the interactions of the sensor nodes in the network minimal, as they are low powered devices and need to conserve their resources. In this paper we propose a light-weight technique for faster mapping of the jammed regions. We minimize the load on the sensors by removing the actual responsibility of mapping from the network to the central base station (BS). After a few nodes report to the BS, it carries out the task of mapping of the jammed regions in the network. We use our simulation results to compare our proposed system with the existing techniques and also to measure the performance of our system. Our results show that the jammed regions in a network can be mapped from fewer nodes reporting to the base station.
[ { "created": "Mon, 27 Jan 2014 20:55:31 GMT", "version": "v1" } ]
2014-01-28
[ [ "Rahman", "Nabila", "" ], [ "Wright", "Matthew", "" ], [ "Liu", "Donggang", "" ] ]
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1401.7006
Aria Ghasemian Sahebi
Aria G. Sahebi and S. Sandeep Pradhan
Polar Codes for Some Multi-terminal Communications Problems
arXiv admin note: substantial text overlap with arXiv:1401.6482
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
It is shown that polar coding schemes achieve the known achievable rate regions for several multi-terminal communications problems including lossy distributed source coding, multiple access channels and multiple descriptions coding. The results are valid for arbitrary alphabet sizes (binary or nonbinary) and arbitrary distributions (symmetric or asymmetric).
[ { "created": "Sat, 25 Jan 2014 05:13:23 GMT", "version": "v1" }, { "created": "Mon, 28 Apr 2014 02:12:00 GMT", "version": "v2" } ]
2014-04-29
[ [ "Sahebi", "Aria G.", "" ], [ "Pradhan", "S. Sandeep", "" ] ]
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1401.7008
Hor\'acio Santana Vieira
H. S. Vieira, V. B. Bezerra
Lagrangian formulation of Newtonian cosmology
5 pages. accepted for publication in Revista Brasileira de Ensino de F\'{i}sica (RBEF). arXiv admin note: text overlap with arXiv:astro-ph/0309756 by other authors
Rev. Bras. Ensino F\'is. 36 (2014) 3310
10.1590/S1806-11172014000300010
null
physics.gen-ph physics.hist-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we use the Lagrangian formalism of classical mechanics and some assumptions to obtain cosmological differential equations analogous to Friedmann and Einstein equations, obtained from the theory of general relativity. This method can be used to a universe constituted of incoherent matter, that is, the cosmologic substratum is comprised of dust.
[ { "created": "Sat, 25 Jan 2014 19:35:58 GMT", "version": "v1" }, { "created": "Fri, 28 Mar 2014 20:28:01 GMT", "version": "v2" }, { "created": "Fri, 18 Jul 2014 20:42:07 GMT", "version": "v3" } ]
2014-09-24
[ [ "Vieira", "H. S.", "" ], [ "Bezerra", "V. B.", "" ] ]
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1401.7020
Samantha Hansen
R.H. Byrd, S.L. Hansen, J. Nocedal, Y.Singer
A Stochastic Quasi-Newton Method for Large-Scale Optimization
null
null
null
null
math.OC cs.LG stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The question of how to incorporate curvature information in stochastic approximation methods is challenging. The direct application of classical quasi- Newton updating techniques for deterministic optimization leads to noisy curvature estimates that have harmful effects on the robustness of the iteration. In this paper, we propose a stochastic quasi-Newton method that is efficient, robust and scalable. It employs the classical BFGS update formula in its limited memory form, and is based on the observation that it is beneficial to collect curvature information pointwise, and at regular intervals, through (sub-sampled) Hessian-vector products. This technique differs from the classical approach that would compute differences of gradients, and where controlling the quality of the curvature estimates can be difficult. We present numerical results on problems arising in machine learning that suggest that the proposed method shows much promise.
[ { "created": "Mon, 27 Jan 2014 21:01:33 GMT", "version": "v1" }, { "created": "Wed, 18 Feb 2015 12:01:35 GMT", "version": "v2" } ]
2015-02-19
[ [ "Byrd", "R. H.", "" ], [ "Hansen", "S. L.", "" ], [ "Nocedal", "J.", "" ], [ "Singer", "Y.", "" ] ]
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1401.7034
Marcos Portnoi
Marcos Portnoi and Joberto S. B. Martins
TARVOS - an Event-Based Simulator for Performance Analysis, Supporting MPLS, RSVP-TE, and Fast Recovery
XIII Brazilian Symposium on Multimedia and the Web - Webmedia 2007, Oct. 20-24, 2007, Gramado, RS, Brazil, vol. 1, p. 222-229
XIII Brazilian Symposium on Multimedia and the Web - Webmedia 2007, Oct. 20-24, 2007, Gramado, RS, Brazil, vol. 1, p. 222-229
null
null
cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper presents a new discrete event-based network simulator named TARVOS - Computer Networks Simulator, being designed as part of the first Author's Masters research and will provide support to simulating MPLS architecture, several RSVP-TE protocol functionalities and fast recovery in case of link failure. The tool is used in a case study, where the impact of a link failure on a VoIP application, within an MPLS domain network, is analyzed. The paper displays a preliminary research of six already available simulators and reasons why they were not adopted as tools for the Masters research. Then, it follows to describe the basics of TARVOS implementation and exhibits the case study simulated by this new tool.
[ { "created": "Mon, 27 Jan 2014 21:51:21 GMT", "version": "v1" } ]
2014-01-29
[ [ "Portnoi", "Marcos", "" ], [ "Martins", "Joberto S. B.", "" ] ]
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1401.7036
Benjamin M. Friedrich
Rui Ma, Gary S. Klindt, Ingmar H. Riedel-Kruse, Frank J\"ulicher, Benjamin M. Friedrich
Active phase and amplitude fluctuations of flagellar beating
accepted for publication in Physical Review Letters
null
10.1103/PhysRevLett.113.048101
null
q-bio.CB cond-mat.soft physics.bio-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The eukaryotic flagellum beats periodically, driven by the oscillatory dynamics of molecular motors, to propel cells and pump fluids. Small, but perceivable fluctuations in the beat of individual flagella have physiological implications for synchronization in collections of flagella as well as for hydrodynamic interactions between flagellated swimmers. Here, we characterize phase and amplitude fluctuations of flagellar bending waves using shape mode analysis and limit cycle reconstruction. We report a quality factor of flagellar oscillations, $Q=38.0\pm 16.7$ (mean$\pm$s.e.). Our analysis shows that flagellar fluctuations are dominantly of active origin. Using a minimal model of collective motor oscillations, we demonstrate how the stochastic dynamics of individual motors can give rise to active small-number fluctuations in motor-cytoskeleton systems.
[ { "created": "Mon, 27 Jan 2014 21:59:59 GMT", "version": "v1" }, { "created": "Wed, 2 Jul 2014 20:32:53 GMT", "version": "v2" } ]
2015-06-18
[ [ "Ma", "Rui", "" ], [ "Klindt", "Gary S.", "" ], [ "Riedel-Kruse", "Ingmar H.", "" ], [ "Jülicher", "Frank", "" ], [ "Friedrich", "Benjamin M.", "" ] ]
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1401.7039
Francis Robicheaux
F. Robicheaux
A proposal for sympathetically cooling neutral molecules using cold ions
null
Phys. Rev. A 89, 062701 (2014)
10.1103/PhysRevA.89.062701
null
physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We describe a method for cooling neutral molecules that have magnetic and electric dipole moments using collisions with cold ions. An external magnetic field is used to split the ground rovibrational energy levels of the molecule. The highest energy state within the ground rovibrational manifold increases in energy as the distance to the ion decreases leading to a repelling potential. At low energy, inelastic collisions are strongly suppressed due to the large distance of closest approach. Thus, a collision between a neutral molecule and a cold ion will lead to a decrease in the molecule's kinetic energy with no change in internal energy. We present results for the specific case of OH molecules cooled by Be$^+$, Mg$^+$, or Ca$^+$ ions.
[ { "created": "Mon, 27 Jan 2014 22:17:19 GMT", "version": "v1" } ]
2014-08-22
[ [ "Robicheaux", "F.", "" ] ]
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1401.7042
Sariel Har-Peled
Sariel Har-Peled, Amir Nayyeri, Mohammad Salavatipour, Anastasios Sidiropoulos
How to Walk Your Dog in the Mountains with No Magic Leash
null
null
null
null
cs.CG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We describe a $O(\log n )$-approximation algorithm for computing the homotopic \Frechet distance between two polygonal curves that lie on the boundary of a triangulated topological disk. Prior to this work, algorithms were known only for curves on the Euclidean plane with polygonal obstacles. A key technical ingredient in our analysis is a $O(\log n)$-approximation algorithm for computing the minimum height of a homotopy between two curves. No algorithms were previously known for approximating this parameter. Surprisingly, it is not even known if computing either the homotopic \Frechet distance, or the minimum height of a homotopy, is in NP.
[ { "created": "Mon, 27 Jan 2014 22:47:15 GMT", "version": "v1" }, { "created": "Tue, 1 Sep 2015 18:24:08 GMT", "version": "v2" } ]
2015-09-02
[ [ "Har-Peled", "Sariel", "" ], [ "Nayyeri", "Amir", "" ], [ "Salavatipour", "Mohammad", "" ], [ "Sidiropoulos", "Anastasios", "" ] ]
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1401.7043
Andrew Mastin
Andrew Mastin, Patrick Jaillet, Sang Chin
Randomized Minmax Regret for Combinatorial Optimization Under Uncertainty
null
null
null
null
cs.DM cs.GT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The minmax regret problem for combinatorial optimization under uncertainty can be viewed as a zero-sum game played between an optimizing player and an adversary, where the optimizing player selects a solution and the adversary selects costs with the intention of maximizing the regret of the player. The existing minmax regret model considers only deterministic solutions/strategies, and minmax regret versions of most polynomial solvable problems are NP-hard. In this paper, we consider a randomized model where the optimizing player selects a probability distribution (corresponding to a mixed strategy) over solutions and the adversary selects costs with knowledge of the player's distribution, but not its realization. We show that under this randomized model, the minmax regret version of any polynomial solvable combinatorial problem becomes polynomial solvable. This holds true for both the interval and discrete scenario representations of uncertainty. Using the randomized model, we show new proofs of existing approximation algorithms for the deterministic model based on primal-dual approaches. Finally, we prove that minmax regret problems are NP-hard under general convex uncertainty.
[ { "created": "Mon, 27 Jan 2014 22:59:52 GMT", "version": "v1" }, { "created": "Sat, 20 Sep 2014 03:34:18 GMT", "version": "v2" } ]
2014-09-23
[ [ "Mastin", "Andrew", "" ], [ "Jaillet", "Patrick", "" ], [ "Chin", "Sang", "" ] ]
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1401.7047
Jonathan Tu
Jonathan H. Tu, Clarence W. Rowley, J. Nathan Kutz, and Jessica K. Shang
Toward compressed DMD: spectral analysis of fluid flows using sub-Nyquist-rate PIV data
null
Exp. Fluids 55(9):1805 (2014)
10.1007/s00348-014-1805-6
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Dynamic mode decomposition (DMD) is a powerful and increasingly popular tool for performing spectral analysis of fluid flows. However, it requires data that satisfy the Nyquist-Shannon sampling criterion. In many fluid flow experiments, such data are impossible to capture. We propose a new approach that combines ideas from DMD and compressed sensing. Given a vector-valued signal, we take measurements randomly in time (at a sub-Nyquist rate) and project the data onto a low-dimensional subspace. We then use compressed sensing to identify the dominant frequencies in the signal and their corresponding modes. We demonstrate this method using two examples, analyzing both an artificially constructed test dataset and particle image velocimetry data collected from the flow past a cylinder. In each case, our method correctly identifies the characteristic frequencies and oscillatory modes dominating the signal, proving the proposed method to be a capable tool for spectral analysis using sub-Nyquist-rate sampling.
[ { "created": "Mon, 27 Jan 2014 23:30:17 GMT", "version": "v1" } ]
2014-09-17
[ [ "Tu", "Jonathan H.", "" ], [ "Rowley", "Clarence W.", "" ], [ "Kutz", "J. Nathan", "" ], [ "Shang", "Jessica K.", "" ] ]
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1401.7056
James Drake
J. F. Drake and M. Swisdak and P. A. Cassak and T. D. Phan
On the 3-D structure and dissipation of reconnection-driven flow-bursts
null
null
10.1002/2014GL060249
null
physics.plasm-ph astro-ph.SR physics.space-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The structure of magnetic reconnection-driven outflows and their dissipation are explored with large-scale, 3-D particle-in-cell (PIC) simulations. Outflow jets resulting from 3-D reconnection with a finite length x-line form fronts as they propagate into the downstream medium. A large pressure increase ahead of this ``reconnection jet front'' (RJF), due to reflected and transmitted ions, slows the front so that its velocity is well below the velocity of the ambient ions in the core of the jet. As a result, the RJF slows and diverts the high-speed flow into the direction perpendicular to the reconnection plane. The consequence is that the RJF acts as a thermalization site for the ion bulk flow and contributes significantly to the dissipation of magnetic energy during reconnection even though the outflow jet is subsonic. This behavior has no counterpart in 2-D reconnection. A simple analytic model predicts the front velocity and the fraction of the ion bulk flow energy that is dissipated.
[ { "created": "Tue, 28 Jan 2014 00:30:44 GMT", "version": "v1" }, { "created": "Tue, 18 Mar 2014 17:29:55 GMT", "version": "v2" } ]
2015-06-18
[ [ "Drake", "J. F.", "" ], [ "Swisdak", "M.", "" ], [ "Cassak", "P. A.", "" ], [ "Phan", "T. D.", "" ] ]
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1401.7057
Masud Mansuripur
Masud Mansuripur, Armis R. Zakharian, and Jerome V. Moloney
Radiation pressure on a dielectric wedge
11 pages, 4 figures, 29 equations, 11 references
Published in Optics Express, Vol. 13, No. 6, pp 2064-2074 (2005)
10.1364/OPEX.13.002064
null
physics.optics physics.class-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The force of electromagnetic radiation on a dielectric medium may be derived by a direct application of the Lorentz law of classical electrodynamics. While the light's electric field acts upon the (induced) bound charges in the medium, its magnetic field exerts a force on the bound currents. We use the example of a wedge-shaped solid dielectric, immersed in a transparent liquid and illuminated at Brewster's angle, to demonstrate that the linear momentum of the electromagnetic field within dielectrics has neither the Minkowski nor the Abraham form; rather, the correct expression for momentum density has equal contributions from both. The time rate of change of the incident momentum thus expressed is equal to the force exerted on the wedge plus that experienced by the surrounding liquid.
[ { "created": "Tue, 28 Jan 2014 00:35:39 GMT", "version": "v1" } ]
2014-01-29
[ [ "Mansuripur", "Masud", "" ], [ "Zakharian", "Armis R.", "" ], [ "Moloney", "Jerome V.", "" ] ]
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1401.7068
Masud Mansuripur
Armis R. Zakharian, Masud Mansuripur, and Jerome V. Moloney
Radiation pressure and the distribution of electromagnetic force in dielectric media (II)
16 pages, 12 figures, 11 equations, 10 references
Published in Optics Express, Vol. 13, No. 7, pp 2321-2336 (2005)
10.1364/OPEX.13.002321
null
physics.optics physics.class-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Using the Finite-Difference-Time-Domain (FDTD) method, we compute the electromagnetic field distribution in and around dielectric media of various shapes and optical properties. With the aid of the constitutive relations, we proceed to compute the bound charge and bound current densities, then employ the Lorentz law of force to determine the distribution of force-density within the regions of interest. For a few simple cases where analytical solutions exist, these solutions are found to be in complete agreement with our numerical results. We also analyze the distribution of fields and forces in more complex systems, and discuss the relevance of our findings to experimental observations. In particular, we demonstrate the single-beam trapping of a dielectric micro-sphere immersed in a liquid under conditions that are typical of optical tweezers.
[ { "created": "Tue, 28 Jan 2014 02:22:47 GMT", "version": "v1" } ]
2014-01-29
[ [ "Zakharian", "Armis R.", "" ], [ "Mansuripur", "Masud", "" ], [ "Moloney", "Jerome V.", "" ] ]
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1401.7070
Andrey A. Sukhorukov
Diana A. Antonosyan, Alexander S. Solntsev, Andrey A. Sukhorukov
Effect of loss on photon-pair generation in nonlinear waveguides arrays
17 pages, 10 figures
Phys. Rev. A 90, 043845 (2014)
10.1103/PhysRevA.90.043845
null
physics.optics quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We describe theoretically the process of spontaneous parametric down-conversion in quadratic nonlinear waveguide arrays in the presence of linear loss. We derive a set of discrete Schrodinger-type equations for the biphoton wave function, and the wave function of one photon when the other photon in a pair is lost. We demonstrate effects arising from loss-affected interference between the generated photon pairs and show that nonlinear waveguide arrays can serve as a robust loss-tolerant integrated platform for the generation of entangled photon states with non-classical spatial correlations.
[ { "created": "Tue, 28 Jan 2014 03:02:29 GMT", "version": "v1" } ]
2014-11-04
[ [ "Antonosyan", "Diana A.", "" ], [ "Solntsev", "Alexander S.", "" ], [ "Sukhorukov", "Andrey A.", "" ] ]
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1401.7072
Martin Z. Bazant
Todd R. Ferguson and Martin Z. Bazant
Phase Transformation Dynamics in Porous Battery Electrodes
null
null
null
null
physics.chem-ph cond-mat.mtrl-sci
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Porous electrodes composed of multiphase active materials are widely used in Li-ion batteries, but their dynamics are poorly understood. Two-phase models are largely empirical, and no models exist for three or more phases. Using a modified porous electrode theory based on non-equilibrium thermodynamics, we show that experimental phase behavior can be accurately predicted from free energy models, without artificially placing phase boundaries or fitting the open circuit voltage. First, we simulate lithium intercalation in porous iron phosphate, a popular two-phase cathode, and show that the zero-current voltage gap, sloping voltage plateau and under-estimated exchange currents all result from size-dependent nucleation and mosaic instability. Next, we simulate porous graphite, the standard anode with three stable phases, and reproduce experimentally observed fronts of color-changing phase transformations. These results provide a framework for physics-based design and control for electrochemical systems with complex thermodynamics.
[ { "created": "Tue, 28 Jan 2014 03:25:47 GMT", "version": "v1" }, { "created": "Thu, 6 Feb 2014 04:14:31 GMT", "version": "v2" } ]
2014-02-07
[ [ "Ferguson", "Todd R.", "" ], [ "Bazant", "Martin Z.", "" ] ]
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1401.7074
Amin Sakzad
Amin Sakzad, Emanuele Viterbo, Joseph Jean Boutros, and Yi Hong
Phase Precoded Compute-and-Forward with Partial Feedback
5 Pages, 4 figures, submitted to ISIT 2014
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this work, we propose phase precoding for the compute-and-forward (CoF) protocol. We derive the phase precoded computation rate and show that it is greater than the original computation rate of CoF protocol without precoder. To maximize the phase precoded computation rate, we need to 'jointly' find the optimum phase precoding matrix and the corresponding network equation coefficients. This is a mixed integer programming problem where the optimum precoders should be obtained at the transmitters and the network equation coefficients have to be computed at the relays. To solve this problem, we introduce phase precoded CoF with partial feedback. It is a quantized precoding system where the relay jointly computes both a quasi-optimal precoder from a finite codebook and the corresponding network equations. The index of the obtained phase precoder within the codebook will then be fedback to the transmitters. A "deep hole phase precoder" is presented as an example of such a scheme. We further simulate our scheme with a lattice code carved out of the Gosset lattice and show that significant coding gains can be obtained in terms of equation error performance.
[ { "created": "Tue, 28 Jan 2014 03:34:48 GMT", "version": "v1" } ]
2014-01-29
[ [ "Sakzad", "Amin", "" ], [ "Viterbo", "Emanuele", "" ], [ "Boutros", "Joseph Jean", "" ], [ "Hong", "Yi", "" ] ]
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1401.7075
Masud Mansuripur
Masud Mansuripur
Radiation pressure and the linear momentum of light in dispersive dielectric media
6 pages, 2 figures, 15 equations, 8 references
Published in Optics Express, Vol. 13, No. 6, pp 2245-2250 (2005)
10.1364/OPEX.13.002245
null
physics.optics physics.class-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We derive an exact expression for the radiation pressure of a quasi- monochromatic plane wave incident from the free space onto the flat surface of a semi-infinite dielectric medium. In order to account for the total optical momentum (incident plus reflected) that is transferred to the dielectric, the mechanical momentum acquired by the medium must be added to the rate of flow of the electromagnetic momentum (the so-called Abraham momentum) inside the dielectric. We confirm that the electromagnetic momentum travels with the group velocity of light inside the medium. The photon drag effect, in which the photons captured in a semiconductor appear to have the Minkowski momentum, is explained by analyzing a model system consisting of a thin absorptive layer embedded in a transparent dielectric.
[ { "created": "Tue, 28 Jan 2014 03:37:27 GMT", "version": "v1" } ]
2014-01-29
[ [ "Mansuripur", "Masud", "" ] ]
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1401.7076
Dmitry Berdinsky
Dmitry Berdinsky, Tae-wan Kim, Durkbin Cho, Cesare Bracco, Sutipong Kiatpanichgij
Bases of T-meshes and the refinement of hierarchical B-splines
null
Berdinsky D., Kim T., Cho D., Bracco C., Kiatpanichgij S., "Bases of T-meshes and the refinement of hierarchical B-splines", Computer Methods in Applied Mechanics and Engineering 2015, V. 283, pp. 841-855
10.1016/j.cma.2014.09.023
null
cs.CG math.NA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we consider spaces of bivariate splines of bi-degree (m, n) with maximal order of smoothness over domains associated to a two-dimensional grid. We define admissible classes of domains for which suitable combinatorial technique allows us to obtain the dimension of such spline spaces and the number of tensor-product B-splines acting effectively on these domains. Following the strategy introduced recently by Giannelli and Juettler, these results enable us to prove that under certain assumptions about the configuration of a hierarchical T-mesh the hierarchical B-splines form a basis of bivariate splines of bi-degree (m, n) with maximal order of smoothness over this hierarchical T-mesh. In addition, we derive a sufficient condition about the configuration of a hierarchical T-mesh that ensures a weighted partition of unity property for hierarchical B-splines with only positive weights.
[ { "created": "Tue, 28 Jan 2014 03:38:01 GMT", "version": "v1" } ]
2021-08-18
[ [ "Berdinsky", "Dmitry", "" ], [ "Kim", "Tae-wan", "" ], [ "Cho", "Durkbin", "" ], [ "Bracco", "Cesare", "" ], [ "Kiatpanichgij", "Sutipong", "" ] ]
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1401.7077
Gerardo Febres
Gerardo Febres, Klaus Jaffe
Quantifying literature quality using complexity criteria
Submitted for publication. 29 pages. 8 figures, 4 tables, 4 appendixes
Journal of Quantitative Linguistics, 2017, Vol 24, Iss 1
10.1080/09296174.2016.1169847
null
cs.CL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We measured entropy and symbolic diversity for English and Spanish texts including literature Nobel laureates and other famous authors. Entropy, symbol diversity and symbol frequency profiles were compared for these four groups. We also built a scale sensitive to the quality of writing and evaluated its relationship with the Flesch's readability index for English and the Szigriszt's perspicuity index for Spanish. Results suggest a correlation between entropy and word diversity with quality of writing. Text genre also influences the resulting entropy and diversity of the text. Results suggest the plausibility of automated quality assessment of texts.
[ { "created": "Tue, 28 Jan 2014 03:48:01 GMT", "version": "v1" }, { "created": "Mon, 10 Feb 2014 20:11:28 GMT", "version": "v2" }, { "created": "Sat, 24 Jan 2015 03:38:02 GMT", "version": "v3" }, { "created": "Sun, 15 Jan 2017 15:49:55 GMT", "version": "v4" } ]
2017-01-17
[ [ "Febres", "Gerardo", "" ], [ "Jaffe", "Klaus", "" ] ]
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1401.7082
Masud Mansuripur
Masud Mansuripur
Angular momentum of circularly polarized light in dielectric media
10 pages, 3 figures, 16 equations, 14 references
Published in Optics Express, Vol. 13, No. 14, pp 5315-5324 (2005)
10.1364/OPEX.13.005315
null
physics.optics physics.class-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A circularly polarized plane-wave is known to have no angular momentum when examined through Maxwell's equations. This, however, contradicts the experimentally observed facts, where finite segments of plane waves are known to be capable of imparting angular momentum to birefringent platelets. Using a superposition of four plane-waves propagating at slightly different angles to a common direction, we derive an expression for the angular momentum density of a single plane-wave in the limit when the propagation directions of the four beams come into alignment. We proceed to use this four-beam technique to analyze the conservation of angular momentum when a plane-wave enters a dielectric slab from the free space. The angular momentum of the beam is shown to decrease upon entering the dielectric medium, by virtue of the fact that the incident beam exerts a torque on the slab surface at the point of entry. When the beam leaves the slab, it imparts an equal but opposite torque to the exit facet, thus recovering its initial angular momentum upon re-emerging into the free-space. Along the way, we derive an expression for the outward-directed force of a normally incident, finite-diameter beam on a dielectric surface; the possible relationship between this force and the experimentally observed bulging of a liquid surface under intense illumination is explored.
[ { "created": "Tue, 28 Jan 2014 04:26:22 GMT", "version": "v1" } ]
2014-01-29
[ [ "Mansuripur", "Masud", "" ] ]
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1401.7085
Wentao Huang
Wentao Huang and Tracey Ho and Michael Langberg and Joerg Kliewer
Reverse Edge Cut-Set Bounds for Secure Network Coding
null
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider the problem of secure communication over a network in the presence of wiretappers. We give a new cut-set bound on secrecy capacity which takes into account the contribution of both forward and backward edges crossing the cut, and the connectivity between their endpoints in the rest of the network. We show the bound is tight on a class of networks, which demonstrates that it is not possible to find a tighter bound by considering only cut set edges and their connectivity.
[ { "created": "Tue, 28 Jan 2014 04:49:20 GMT", "version": "v1" } ]
2014-01-29
[ [ "Huang", "Wentao", "" ], [ "Ho", "Tracey", "" ], [ "Langberg", "Michael", "" ], [ "Kliewer", "Joerg", "" ] ]
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1401.7088
Monowar Hasan
Hina Tabassum, Uzma Siddique, Ekram Hossain, and Md. Jahangir Hossain
Cellular Downlink Performance with Base Station Sleeping, User Association, and Scheduling
Submitted to IEEE Transactions on Wireless Communications
null
10.1109/TWC.2014.2336249
null
cs.NI cs.IT math.IT stat.AP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Base station (BS) sleeping has emerged as a viable solution to enhance the overall network energy efficiency by inactivating the underutilized BSs. However, it affects the performance of users in sleeping cells depending on their BS association criteria, their channel conditions towards the active BSs, and scheduling criteria and traffic loads at the active BSs. This paper characterizes the performance of cellular systems with BS sleeping by developing a systematic framework to derive the spectral efficiency and outage probability of downlink transmission to the sleeping cell users taking into account the aforementioned factors. In this context, we develop a user association scheme in which a typical user in a sleeping cell selects a BS with \textbf{M}aximum best-case \textbf{M}ean channel \textbf{A}ccess \textbf{P}robability (MMAP) which is calculated by all active BSs based on their existing traffic loads. We consider both greedy and round-robin schemes at active BSs for scheduling users in a channel. Once the association is performed, the exact access probability for a typical sleeping cell user and the statistics of its received signal and interference powers are derived to evaluate the spectral and energy efficiencies of transmission. For the sleeping cell users, we also consider the conventional \textbf{M}aximum \textbf{R}eceived \textbf{S}ignal \textbf{P}ower (MRSP)-based user association scheme along with greedy and round-robin schemes at the BSs. The impact of cell-zooming is incorporated in the derivations to analyze its feasibility in reducing the coverage holes created by BS sleeping. Numerical results show the trade-offs between spectral efficiency and energy efficiency in various network scenarios. The accuracy of the analysis is verified through Monte-Carlo simulations.
[ { "created": "Tue, 28 Jan 2014 05:39:31 GMT", "version": "v1" } ]
2016-11-17
[ [ "Tabassum", "Hina", "" ], [ "Siddique", "Uzma", "" ], [ "Hossain", "Ekram", "" ], [ "Hossain", "Md. Jahangir", "" ] ]
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1401.7090
Keang-Po Ho
Keang-Po Ho, Joseph M. Kahn and Jeffrey P. Wilde
Wavelength-Selective Switches for Mode-Division Multiplexing: Scaling and Performance Analysis
12 pages, 9 figures. appears in Journal of Lightwave Technology, 2014
null
10.1109/JLT.2014.2355812
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Wavelength-selective switches for mode-division-multiplexing systems are designed by scaling switches from single-mode systems. All modes at a given wavelength are switched as a unit, which is necessary in systems with substantial mode coupling, and minimizes the number of ports required to accommodate a given traffic volume. When a pure mode is present at the input, modal transmission and coupling coefficients are mode-dependent and may be computed using a simple mode-clipping model. When multiple modes are present, interference between modes alters the transmission and coupling coefficients, shifting the passband center frequency and changing its bandwidth. Mode-coupling matrices are used to compute mixed modes having the narrowest or widest bandwidths, or having the largest center-frequency offsets. In a specific design for graded-index fiber, five mode groups and 50-GHz channel spacing, the one-sided bandwidth may change up to $\pm$3.6 GHz. In a system with many cascaded switches and strong mode coupling, the end-to-end response per switch may be characterized by a mode-averaged transmission coefficient.
[ { "created": "Tue, 28 Jan 2014 06:02:16 GMT", "version": "v1" }, { "created": "Thu, 4 Sep 2014 04:22:48 GMT", "version": "v2" } ]
2015-06-18
[ [ "Ho", "Keang-Po", "" ], [ "Kahn", "Joseph M.", "" ], [ "Wilde", "Jeffrey P.", "" ] ]
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1401.7095
Thibault Frisson
Thibault Frisson, Roman Poeschl
Coherent noise source identification in multi channel analysis
Public version of the CALICE Internal Note CIN-022
null
null
null
physics.ins-det hep-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The evaluation of coherent noise can provide useful information in the study of detectors. The identification of coherent noise sources is also relevant for uncertainty calculations in analyse where several channels are combined. The study of the covariance matrix give information about coherent noises. Since covariance matrix of high dimension data could be difficult to analyse, the development of analysis tools is needed. Principal Component Analysis (PCA) is a powerful tool for such analysis. It has been shown that we can use PCA to find coherent noises in ATLAS calorimeter or the CALICE Si-W electromagnetic calorimeter physics prototype. However, if several coherent noise sources are combined, the interpretation of the PCA may become complicated. In this paper, we present another method based on the study of the covariance matrix to identify noise sources. This method has been developed for the study of front end ASICs dedicated to CALICE calorimeters. These calorimeters are designed and studied for experiments at the ILC. We also study the reliability of the method with simulations. Although this method has been developped for a specific application, it can be used for any multi channel analysis.
[ { "created": "Tue, 28 Jan 2014 06:52:37 GMT", "version": "v1" } ]
2014-01-29
[ [ "Frisson", "Thibault", "" ], [ "Poeschl", "Roman", "" ] ]
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1401.7100
Craig Jin
Reza Zolfaghari, Nicolas Epain, Craig T. Jin, Joan Glaun\`es, Anthony Tew
Large Deformation Diffeomorphic Metric Mapping And Fast-Multipole Boundary Element Method Provide New Insights For Binaural Acoustics
Submitted as a conference paper to IEEE ICASSP 2014
null
10.1109/ICASSP.2014.6854123
null
cs.CG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper describes how Large Deformation Diffeomorphic Metric Mapping (LDDMM) can be coupled with a Fast Multipole (FM) Boundary Element Method (BEM) to investigate the relationship between morphological changes in the head, torso, and outer ears and their acoustic filtering (described by Head Related Transfer Functions, HRTFs). The LDDMM technique provides the ability to study and implement morphological changes in ear, head and torso shapes. The FM-BEM technique provides numerical simulations of the acoustic properties of an individual's head, torso, and outer ears. This paper describes the first application of LDDMM to the study of the relationship between a listener's morphology and a listener's HRTFs. To demonstrate some of the new capabilities provided by the coupling of these powerful tools, we examine the classical question of what it means to ``listen through another individual's outer ears.'' This work utilizes the data provided by the Sydney York Morphological and Acoustic Recordings of Ears (SYMARE) database.
[ { "created": "Tue, 28 Jan 2014 07:18:33 GMT", "version": "v1" } ]
2016-11-17
[ [ "Zolfaghari", "Reza", "" ], [ "Epain", "Nicolas", "" ], [ "Jin", "Craig T.", "" ], [ "Glaunès", "Joan", "" ], [ "Tew", "Anthony", "" ] ]
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1401.7103
Alexander Vorob'ev
Alexander Vorob'ev, Anton Chesnitskiy, Alexander Toropov, and Victor Prinz
Three-axis Hall transducer based on semiconductor microtubes
9 pages, 5 figures, 21 references
Applied Physics Letters, Volume: 103, Issue: 17, Article Number: 173513, Published: OCT 21 2013
10.1063/1.4826680
null
cond-mat.mes-hall physics.ins-det
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A three-axis Hall transducer based on GaAs/AlGaAs/InGaAs microtubes has been fabricated. The possibility of simultaneous measurement of all the three magnetic field components with such a transducer was demonstrated. It was also shown possible to pack the free-standing parts of the transducer with polydimethylsiloxane for protection of those parts from mechanical actions.
[ { "created": "Tue, 28 Jan 2014 07:19:51 GMT", "version": "v1" } ]
2014-01-29
[ [ "Vorob'ev", "Alexander", "" ], [ "Chesnitskiy", "Anton", "" ], [ "Toropov", "Alexander", "" ], [ "Prinz", "Victor", "" ] ]
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1401.7104
J\"urgen M\"unch
Olga Jaufman, J\"urgen M\"unch
Acquisition of a Project-Specific Process
15 pages. The final publication is available at http://link.springer.com/chapter/10.1007%2F11497455_27
Product Focused Software Process Improvement, volume 3547 of Lecture Notes in Computer Science, pages 328-342. Springer Berlin Heidelberg, 2005
10.1007/11497455_27
null
cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Currently, proposed development processes are often considered too generic for operational use. This often leads to a misunderstanding of the project-specific processes and its refuse. One reason for non-appropriate project-specific processes is insufficient support for the tailoring of generic processes to project characteristics and context constraints. To tackle this problem, we propose a method for the acquisition of a project-specific process. This method uses a domain-specific process line for top-down process tailoring and supports bottom-up refinement of the defined generic process based on tracking process activities. The expected advantage of the method is tailoring efficiency gained by usage of a process line and higher process adherence gained by bottom-up adaptation of the process. The work described was conducted in the automotive domain. This article presents an overview of the so-called Emergent Process Acquisition method (EPAc) and sketches an initial validation study.
[ { "created": "Tue, 28 Jan 2014 07:30:53 GMT", "version": "v1" } ]
2014-01-29
[ [ "Jaufman", "Olga", "" ], [ "Münch", "Jürgen", "" ] ]
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1401.7110
Zhengjun Cao
Zhengjun Cao and Lihua Liu
A Fast String Matching Algorithm Based on Lowlight Characters in the Pattern
null
null
null
null
cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We put forth a new string matching algorithm which matches the pattern from neither the left nor the right end, instead a special position. Comparing with the Knuth-Morris-Pratt algorithm and the Boyer-Moore algorithm, the new algorithm is more flexible to pick the position for starting comparisons. The option really brings it a saving in cost.
[ { "created": "Tue, 28 Jan 2014 08:27:19 GMT", "version": "v1" } ]
2014-01-29
[ [ "Cao", "Zhengjun", "" ], [ "Liu", "Lihua", "" ] ]
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1401.7114
Junyoung Nam
Junyoung Nam
Fundamental Limits in Correlated Fading MIMO Broadcast Channels: Benefits of Transmit Correlation Diversity
29 pages, 8 figures
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We investigate asymptotic capacity limits of the Gaussian MIMO broadcast channel (BC) with spatially correlated fading to understand when and how much transmit correlation helps the capacity. By imposing a structure on channel covariances (equivalently, transmit correlations at the transmitter side) of users, also referred to as \emph{transmit correlation diversity}, the impact of transmit correlation on the power gain of MIMO BCs is characterized in several regimes of system parameters, with a particular interest in the large-scale array (or massive MIMO) regime. Taking the cost for downlink training into account, we provide asymptotic capacity bounds of multiuser MIMO downlink systems to see how transmit correlation diversity affects the system multiplexing gain. We make use of the notion of joint spatial division and multiplexing (JSDM) to derive the capacity bounds. It is advocated in this paper that transmit correlation diversity may be of use to significantly increase multiplexing gain as well as power gain in multiuser MIMO systems. In particular, the new type of diversity in wireless communications is shown to improve the system multiplexing gain up to by a factor of the number of degrees of such diversity. Finally, performance limits of conventional large-scale MIMO systems not exploiting transmit correlation are also characterized.
[ { "created": "Tue, 28 Jan 2014 08:57:03 GMT", "version": "v1" }, { "created": "Tue, 8 Apr 2014 13:16:44 GMT", "version": "v2" }, { "created": "Fri, 10 Oct 2014 16:05:51 GMT", "version": "v3" } ]
2014-10-13
[ [ "Nam", "Junyoung", "" ] ]
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1401.7116
Teemu Roos
Andrew Barron, Teemu Roos and Kazuho Watanabe
Bayesian Properties of Normalized Maximum Likelihood and its Fast Computation
Submitted to ISIT-2004 conference
null
null
null
cs.IT cs.LG math.IT stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The normalized maximized likelihood (NML) provides the minimax regret solution in universal data compression, gambling, and prediction, and it plays an essential role in the minimum description length (MDL) method of statistical modeling and estimation. Here we show that the normalized maximum likelihood has a Bayes-like representation as a mixture of the component models, even in finite samples, though the weights of linear combination may be both positive and negative. This representation addresses in part the relationship between MDL and Bayes modeling. This representation has the advantage of speeding the calculation of marginals and conditionals required for coding and prediction applications.
[ { "created": "Tue, 28 Jan 2014 09:06:30 GMT", "version": "v1" } ]
2014-01-29
[ [ "Barron", "Andrew", "" ], [ "Roos", "Teemu", "" ], [ "Watanabe", "Kazuho", "" ] ]
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1401.7117
Brice Saint-Michel
B Saint-Michel, E Herbert, J Salort, C Baudet, M Bon Mardion, P Bonnay, M Bourgoin, B Castaing, L Chevillard, F Daviaud, P Diribarne, B Dubrulle, Y Gagne, M Gibert, A Girard, B H\'ebral, Th Lehner, B Rousset
Probing quantum and classical turbulence analogy through global bifurcations in a von K\'arm\'an liquid Helium experiment
5 pages, 5 figures
null
10.1063/1.4904378
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We report measurements of the dissipation in the Superfluid Helium high REynold number von Karman flow (SHREK) experiment for different forcing conditions, through a regime of global hysteretic bifurcation. Our macroscopical measurements indicate no noticeable difference between the classical fluid and the superfluid regimes, thereby providing evidence of the same dissipative anomaly and response to asymmetry in fluid and superfluid regime. %In the latter case, A detailed study of the variations of the hysteretic cycle with Reynolds number supports the idea that (i) the stability of the bifurcated states of classical turbulence in this closed flow is partly governed by the dissipative scales and (ii) the normal and the superfluid component at these temperatures (1.6K) are locked down to the dissipative length scale.
[ { "created": "Tue, 28 Jan 2014 09:09:53 GMT", "version": "v1" }, { "created": "Fri, 31 Jan 2014 08:33:17 GMT", "version": "v2" } ]
2015-12-15
[ [ "Saint-Michel", "B", "" ], [ "Herbert", "E", "" ], [ "Salort", "J", "" ], [ "Baudet", "C", "" ], [ "Mardion", "M Bon", "" ], [ "Bonnay", "P", "" ], [ "Bourgoin", "M", "" ], [ "Castaing", "B", "" ], [ "Chevillard", "L", "" ], [ "Daviaud", "F", "" ], [ "Diribarne", "P", "" ], [ "Dubrulle", "B", "" ], [ "Gagne", "Y", "" ], [ "Gibert", "M", "" ], [ "Girard", "A", "" ], [ "Hébral", "B", "" ], [ "Lehner", "Th", "" ], [ "Rousset", "B", "" ] ]
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1401.7124
Ricardo Martinez-Garcia
Ricardo Martinez-Garcia, Justin M. Calabrese and Cristobal Lopez
Optimal search in interacting populations:Gaussian jumps vs Levy flights
9 pages, 6 figures
Physical Review E, 89(3), 032718, 2014
10.1103/PhysRevE.89.032718
null
cond-mat.stat-mech physics.bio-ph q-bio.PE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We investigated the relationships between search efficiency, movement strategy, and non-local communication in the biological context of animal foraging. We considered situations where the members of a population of foragers perform either Gaussian jumps or Levy flights, and show that the search time is minimized when communication among individuals occurs at intermediate ranges, independently of the type of movement. Additionally, while Brownian strategies are more strongly influenced by the communication mechanism, Levy flights still result in shorter overall search durations.
[ { "created": "Tue, 28 Jan 2014 10:04:16 GMT", "version": "v1" } ]
2014-03-28
[ [ "Martinez-Garcia", "Ricardo", "" ], [ "Calabrese", "Justin M.", "" ], [ "Lopez", "Cristobal", "" ] ]
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1401.7129
Viswanadh Konjeti
Garimella Rama Murthy
Towards a Resolution of P = NP Conjecture
15 pages. arXiv admin note: substantial text overlap with arXiv:1207.0634
null
null
null
cs.NA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this research paper, the problem of optimization of a quadratic form over the convex hull generated by the corners of hypercube is attempted and solved. It is reasoned that under some conditions, the optimum occurs at the corners of hypercube. Results related to the computation of global optimum stable state (an NP hard problem) are discussed. An algorithm is proposed. It is hoped that the results shed light on resolving the P not equal to NP problem.
[ { "created": "Tue, 28 Jan 2014 10:36:04 GMT", "version": "v1" } ]
2014-01-29
[ [ "Murthy", "Garimella Rama", "" ] ]
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1401.7134
Kasper Fl{\o}e Trillingsgaard
Kasper Fl{\o}e Trillingsgaard and Petar Popovski
Block-Fading Channels with Delayed CSIT at Finite Blocklength
Extended version of a paper submitted to ISIT'14
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In many wireless systems, the channel state information at the transmitter (CSIT) can not be learned until after a transmission has taken place and is thereby outdated. In this paper, we study the benefits of delayed CSIT on a block-fading channel at finite blocklength. First, the achievable rates of a family of codes that allows the number of codewords to expand during transmission, based on delayed CSIT, are characterized. A fixed-length and a variable-length characterization of the rates are provided using the dependency testing bound and the variable-length setting introduced by Polyanskiy et al. Next, a communication protocol based on codes with expandable message space is put forth, and numerically, it is shown that higher rates are achievable compared to coding strategies that do not benefit from delayed CSIT.
[ { "created": "Tue, 28 Jan 2014 10:59:35 GMT", "version": "v1" } ]
2014-01-29
[ [ "Trillingsgaard", "Kasper Fløe", "" ], [ "Popovski", "Petar", "" ] ]
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1401.7141
Xiao Lu
Dusit Niyato, Xiao Lu, and Ping Wang
Adaptive Power Management for Wireless Base Station in Smart Grid Environment
IEEE Wireless Communication (17 pages, 6 figures.)
null
10.1109/MWC.2012.6393517
null
cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The growing concerns of a global environmental change raises a revolution on the way of utilizing energy. In wireless industry, green wireless communications has recently gained increasing attention and is expected to play a major role in reduction of electrical power consumption. In particular, actions to promote energy saving of wireless communications with regard to environmental protection are becoming imperative. To this purpose, we study a green communication system model where wireless base station is provisioned with a combination of renewable power source and electrical grid to minimize power consumption as well as meeting the users' demand. More specifically, we focus on an adaptive power management for wireless base station to minimize power consumption under various uncertainties including renewable power generation, power price, and wireless traffic load. We believe that demand side power management solution based on the studied communication architecture is a major step towards green wireless communications.
[ { "created": "Tue, 28 Jan 2014 11:12:21 GMT", "version": "v1" } ]
2016-11-17
[ [ "Niyato", "Dusit", "" ], [ "Lu", "Xiao", "" ], [ "Wang", "Ping", "" ] ]
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1401.7146
Xiao Lu
Xiao Lu, Ke Zhang, Chuan Heng Foh, and Cheng Peng Fu
SSthreshless Start: A Sender-Side TCP Intelligence for Long Fat Network
25 pages, 10 figures, 7 tables
null
null
null
cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Measurement shows that 85% of TCP flows in the internet are short-lived flows that stay most of their operation in the TCP startup phase. However, many previous studies indicate that the traditional TCP Slow Start algorithm does not perform well, especially in long fat networks. Two obvious problems are known to impact the Slow Start performance, which are the blind initial setting of the Slow Start threshold and the aggressive increase of the probing rate during the startup phase regardless of the buffer sizes along the path. Current efforts focusing on tuning the Slow Start threshold and/or probing rate during the startup phase have not been considered very effective, which has prompted an investigation with a different approach. In this paper, we present a novel TCP startup method, called threshold-less slow start or SSthreshless Start, which does not need the Slow Start threshold to operate. Instead, SSthreshless Start uses the backlog status at bottleneck buffer to adaptively adjust probing rate which allows better seizing of the available bandwidth. Comparing to the traditional and other major modified startup methods, our simulation results show that SSthreshless Start achieves significant performance improvement during the startup phase. Moreover, SSthreshless Start scales well with a wide range of buffer size, propagation delay and network bandwidth. Besides, it shows excellent friendliness when operating simultaneously with the currently popular TCP NewReno connections.
[ { "created": "Tue, 28 Jan 2014 11:50:10 GMT", "version": "v1" } ]
2014-01-29
[ [ "Lu", "Xiao", "" ], [ "Zhang", "Ke", "" ], [ "Foh", "Chuan Heng", "" ], [ "Fu", "Cheng Peng", "" ] ]
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1401.7148
Cornelia Victoria Anghel Drugarin
Anghel Drugarin, Cornelia Victoria
A Software Design through Electrical System for a Building
Politehnica Timisoara Press, nov.2013
null
null
null
cs.OH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Computer aided design of lighting systems made new installations of lighting dimensioning and verification of existing lighting systems for both indoor and outdoor lighting systems.The design of the building light system was in a dedicated software, named DiaLux, version 4.11.
[ { "created": "Tue, 28 Jan 2014 11:55:00 GMT", "version": "v1" } ]
2014-01-29
[ [ "Drugarin", "Anghel", "" ], [ "Victoria", "Cornelia", "" ] ]
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1401.7157
Christopher Niall Thomas
Christophe Craeye (1), Stafford Withington (2), Christopher N. Thomas (2) ((1) Universite catholique de Louvain, (2) University of Cambridge)
Characteristic Functions Describing the Power Absorption Response of Periodic Structures to Partially Coherent Fields
Submitted to JOSA A
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null
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physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Many new types of sensing or imaging surfaces are based on periodic thin films. It is explained how the response of those surfaces to partially coherent fields can be fully characterized by a set of functions in the wavenumber spectrum domain. The theory is developed here for the case of 2D absorbers with TE illumination and arbitrary material properties in the plane of the problem, except for the resistivity which is assumed isotropic. Sum and difference coordinates in both spatial and spectral domains are conveniently used to represent the characteristic functions, which are specialized here to the case of periodic structures. Those functions can be either computed or obtained experimentally. Simulations rely on solvers based on periodic-boundary conditions, while experiments correspond to Energy Absorption Interferometry (EAI), already described in the literature. We derive rules for the convergence of the representation versus the number of characteristic functions used, as well as for the sampling to be considered in EAI experiments. Numerical examples are given for the case of absorbing strips printed on a semi-infinite substrate.
[ { "created": "Tue, 28 Jan 2014 12:25:27 GMT", "version": "v1" } ]
2014-01-29
[ [ "Craeye", "Christophe", "", "Universite catholique de Louvain" ], [ "Withington", "Stafford", "", "University of Cambridge" ], [ "Thomas", "Christopher N.", "", "University of Cambridge" ] ]
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1401.7161
Hwanchol Jang
Hwanchol Jang, Saeid Nooshabadi, Kiseon Kim, Heung-No Lee
Circular Sphere Decoding: A Low Complexity Detection for MIMO Systems with General Two-dimensional Signal Constellations
Published in IEEE Trans. Vehicular Technology
null
10.1109/TVT.2016.2570942
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose a low complexity complex valued Sphere Decoding (CV-SD) algorithm, referred to as Circular Sphere Decoding (CSD) which is applicable to multiple-input multiple-output (MIMO) systems with arbitrary two dimensional (2D) constellations. CSD provides a new constraint test. This constraint test is carefully designed so that the element-wise dependency is removed in the metric computation for the test. As a result, the constraint test becomes simple to perform without restriction on its constellation structure. By additionally employing this simple test as a prescreening test, CSD reduces the complexity of the CV-SD search. We show that the complexity reduction is significant while its maximum-likelihood (ML) performance is not compromised. We also provide a powerful tool to estimate the pruning capacity of any particular search tree. Using this tool, we propose the Predict-And-Change strategy which leads to a further complexity reduction in CSD. Extension of the proposed methods to soft output SD is also presented.
[ { "created": "Tue, 28 Jan 2014 12:49:50 GMT", "version": "v1" }, { "created": "Mon, 20 Apr 2015 05:53:03 GMT", "version": "v2" }, { "created": "Wed, 11 May 2016 02:41:18 GMT", "version": "v3" }, { "created": "Fri, 20 May 2016 08:12:40 GMT", "version": "v4" } ]
2016-11-17
[ [ "Jang", "Hwanchol", "" ], [ "Nooshabadi", "Saeid", "" ], [ "Kim", "Kiseon", "" ], [ "Lee", "Heung-No", "" ] ]
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1401.7165
Surjya Ram
S. P. Ram, S. R. Mishra, S. K. Tiwari and H. S. Rawat
Temperature and phase-space density of cold atom cloud in a quadrupole magnetic trap
9 pages, 7 figures
null
10.3938/jkps.65.462
null
physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present studies on the modifications in temperature, number density and phase-space density when a laser cooled atom cloud from the optical molasses is trapped in a quadrupole magnetic trap. Theoretically it is shown that for a given temperature and size of the cloud from the molasses, the phase-space density in the magnetic trap first increases with magnetic field gradient and then decreases with it, after attaining a maximum value at an optimum value of magnetic field gradient. The experimentally measured variation in phase-space density in the magnetic trap with the magnetic field gradient has shown the similar trend. However, the experimentally measured values of number density and phase-space density are much lower than their theoretically predicted values. This is attributed to the higher experimentally observed temperature in the magnetic trap than the theoretically predicted temperature. Nevertheless, these studies can be useful to set a higher phase-space density in the trap by setting the optimum value of field gradient of the quadrupole magnetic trap.
[ { "created": "Tue, 28 Jan 2014 13:08:06 GMT", "version": "v1" }, { "created": "Tue, 10 Jun 2014 04:57:25 GMT", "version": "v2" } ]
2015-06-18
[ [ "Ram", "S. P.", "" ], [ "Mishra", "S. R.", "" ], [ "Tiwari", "S. K.", "" ], [ "Rawat", "H. S.", "" ] ]
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1401.7166
Martin Lemoine
M. Lemoine (IAP), G. Pelletier (IPAG), L. Gremillet (CEA/DAM/DIF), I. Plotnikov (IPAG)
Current-driven filamentation upstream of magnetized relativistic collisionless shocks
14 pages, 8 figures; to appear in MNRAS
null
10.1093/mnras/stu213
null
astro-ph.HE astro-ph.CO physics.plasm-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The physics of instabilities in the precursor of relativistic collisionless shocks is of broad importance in high energy astrophysics, because these instabilities build up the shock, control the particle acceleration process and generate the magnetic fields in which the accelerated particles radiate. Two crucial parameters control the micro-physics of these shocks: the magnetization of the ambient medium and the Lorentz factor of the shock front; as of today, much of this parameter space remains to be explored. In the present paper, we report on a new instability upstream of electron-positron relativistic shocks and we argue that this instability shapes the micro-physics at moderate magnetization levels and/or large Lorentz factors. This instability is seeded by the electric current carried by the accelerated particles in the shock precursor as they gyrate around the background magnetic field. The compensation current induced in the background plasma leads to an unstable configuration, with the appearance of charge neutral filaments carrying a current of the same polarity, oriented along the perpendicular current. This ``current-driven filamentation'' instability grows faster than any other instability studied so far upstream of relativistic shocks, with a growth rate comparable to the plasma frequency. Furthermore, the compensation of the current is associated with a slow-down of the ambient plasma as it penetrates the shock precursor (as viewed in the shock rest frame). This slow-down of the plasma implies that the ``current driven filamentation'' instability can grow for any value of the shock Lorentz factor, provided the magnetization \sigma <~ 10^{-2}. We argue that this instability explains the results of recent particle-in-cell simulations in the mildly magnetized regime.
[ { "created": "Tue, 28 Jan 2014 13:11:18 GMT", "version": "v1" } ]
2015-06-18
[ [ "Lemoine", "M.", "", "IAP" ], [ "Pelletier", "G.", "", "IPAG" ], [ "Gremillet", "L.", "", "CEA/DAM/DIF" ], [ "Plotnikov", "I.", "", "IPAG" ] ]
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1401.7169
Tomaso Erseghe
Tomaso Erseghe
On the Evaluation of the Polyanskiy-Poor-Verdu Converse Bound for Finite Blocklength Coding in AWGN
13 pages, 10 figures. Matlab code available from http://dgt.dei.unipd.it section Download->Finite Blocklength Regime
IEEE Transactions on Information Theory, Vol. 61, No. 12, pp. 6578-6590, December 2015
10.1109/TIT.2015.2494061
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A tight converse bound to channel coding rate in the finite block-length regime and under AWGN conditions was recently proposed by Polyanskiy, Poor, and Verdu (PPV). The bound is a generalization of a number of other classical results, and it was also claimed to be equivalent to Shannon's 1959 cone packing bound. Unfortunately, its numerical evaluation is troublesome even for not too large values of the block-length n. In this paper we tackle the numerical evaluation by compactly expressing the PPV converse bound in terms of non-central chi-squared distributions, and by evaluating those through a an integral expression and a corresponding series expansion which exploit a method proposed by Temme. As a result, a robust evaluation method and new insights on the bound's asymptotics, as well as new approximate expressions, are given.
[ { "created": "Tue, 28 Jan 2014 13:19:53 GMT", "version": "v1" }, { "created": "Mon, 18 May 2015 12:16:37 GMT", "version": "v2" }, { "created": "Wed, 15 Jun 2016 13:21:20 GMT", "version": "v3" } ]
2016-06-16
[ [ "Erseghe", "Tomaso", "" ] ]
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1401.7171
Lei Song
Joost-Pieter Katoen and Lei Song and Lijun Zhang
Probably Safe or Live
null
null
null
null
cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper presents a formal characterisation of safety and liveness properties \`a la Alpern and Schneider for fully probabilistic systems. As for the classical setting, it is established that any (probabilistic tree) property is equivalent to a conjunction of a safety and liveness property. A simple algorithm is provided to obtain such property decomposition for flat probabilistic CTL (PCTL). A safe fragment of PCTL is identified that provides a sound and complete characterisation of safety properties. For liveness properties, we provide two PCTL fragments, a sound and a complete one. We show that safety properties only have finite counterexamples, whereas liveness properties have none. We compare our characterisation for qualitative properties with the one for branching time properties by Manolios and Trefler, and present sound and complete PCTL fragments for characterising the notions of strong safety and absolute liveness coined by Sistla.
[ { "created": "Tue, 28 Jan 2014 13:22:25 GMT", "version": "v1" }, { "created": "Fri, 16 May 2014 10:34:19 GMT", "version": "v2" } ]
2014-05-19
[ [ "Katoen", "Joost-Pieter", "" ], [ "Song", "Lei", "" ], [ "Zhang", "Lijun", "" ] ]
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1401.7174
Roy Shiloh
Roy Shiloh, Yossi Lereah, Yigal Lilach and Ady Arie
Sculpturing the Electron Wave Function
13 pages, 4 figures. Submitted to Nature
null
10.1016/j.ultramic.2014.04.007
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Coherent electrons such as those in electron microscopes, exhibit wave phenomena and may be described by the paraxial wave equation. In analogy to light-waves, governed by the same equation, these electrons share many of the fundamental traits and dynamics of photons. Today, spatial manipulation of electron beams is achieved mainly using electrostatic and magnetic fields. Other demonstrations include simple phase-plates and holographic masks based on binary diffraction gratings. Altering the spatial profile of the beam may be proven useful in many fields incorporating phase microscopy, electron holography, and electron-matter interactions. These methods, however, are fundamentally limited due to energy distribution to undesired diffraction orders as well as by their binary construction. Here we present a new method in electron-optics for arbitrarily shaping of electron beams, by precisely controlling an engineered pattern of thicknesses on a thin-membrane, thereby molding the spatial phase of the electron wavefront. Aided by the past decade's monumental leap in nano-fabrication technology and armed with light-optic's vast experience and knowledge, one may now spatially manipulate an electron beam's phase in much the same way light waves are shaped simply by passing them through glass elements such as refractive and diffractive lenses. We show examples of binary and continuous phase-plates and demonstrate the ability to generate arbitrary shapes of the electron wave function using a holographic phase-mask. This opens exciting new possibilities for microscopic studies of materials using shaped electron beams and enables electron beam lithography without the need to move the electron beam or the sample, as well as high resolution inspection of electronic chips by structured electron illumination.
[ { "created": "Tue, 28 Jan 2014 13:29:09 GMT", "version": "v1" } ]
2014-07-17
[ [ "Shiloh", "Roy", "" ], [ "Lereah", "Yossi", "" ], [ "Lilach", "Yigal", "" ], [ "Arie", "Ady", "" ] ]
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1401.7178
Sergey Moiseev A
S. A. Moiseev, A. I. Sidorova, and B. S. Ham
Stationary and quasi-stationary light pulse in three-level cold atomic system
10 pages, 14 figures
null
10.1103/PhysRevA.89.043802
null
physics.optics physics.atom-ph quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We have studied stationary and quasi-stationary signal light pulses in cold lambda-type atomic media driven by counterpropagating control laser fields at the condition of electromagnetically induced transparency. By deriving a dispersion relation we present spectral and temporal properties of the signal light pulse and a significant influence of atomic decoherence on the coupled stationary light pulses for spatial splitting. Finally we discuss quasi-stationary light pulse evolution characterized by frozen spatial spreading for a robust coherent control of slow light pulses.
[ { "created": "Tue, 28 Jan 2014 13:39:48 GMT", "version": "v1" } ]
2015-06-18
[ [ "Moiseev", "S. A.", "" ], [ "Sidorova", "A. I.", "" ], [ "Ham", "B. S.", "" ] ]
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1401.7181
Lichao Zhao
L. Zhao, J. Jiang, and Y. Liu
Optimizing a spin-flip Zeeman slower
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null
null
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cond-mat.quant-gas physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a design of a spin-flip Zeeman slower controlled by a fast feedback circuit for a sodium Bose-Einstein condensate apparatus. We also demonstrate how the efficiency of the slower strongly depends on its intrinsic parameters, and compare these observations with a few theoretical models. Our findings lead to a simple three-step procedure of designing an optimal Zeeman slower for neutral atoms, especially for those atomic species with high initial velocities, such as sodium and lithium atoms.
[ { "created": "Tue, 28 Jan 2014 13:55:48 GMT", "version": "v1" } ]
2014-01-29
[ [ "Zhao", "L.", "" ], [ "Jiang", "J.", "" ], [ "Liu", "Y.", "" ] ]
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1401.7188
Orestis Georgiou
Orestis Georgiou, Carl P. Dettmann, Justin P. Coon
Network Connectivity: Stochastic vs. Deterministic Wireless Channels
6 pages, 5 figures
null
null
null
cs.NI cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the effect of stochastic wireless channel models on the connectivity of ad hoc networks. Unlike in the deterministic geometric disk model where nodes connect if they are within a certain distance from each other, stochastic models attempt to capture small-scale fading effects due to shadowing and multipath received signals. Through analysis of local and global network observables, we present conclusive evidence suggesting that network behaviour is highly dependent upon whether a stochastic or deterministic connection model is employed. Specifically we show that the network mean degree is lower (higher) for stochastic wireless channels than for deterministic ones, if the path loss exponent is greater (lesser) than the spatial dimension. Similarly, the probability of forming isolated pairs of nodes in an otherwise dense random network is much less for stochastic wireless channels than for deterministic ones. The latter realisation explains why the upper bound of $k$-connectivity is tighter for stochastic wireless channels. We obtain closed form analytic results and compare to extensive numerical simulations.
[ { "created": "Tue, 28 Jan 2014 14:02:54 GMT", "version": "v1" } ]
2014-01-29
[ [ "Georgiou", "Orestis", "" ], [ "Dettmann", "Carl P.", "" ], [ "Coon", "Justin P.", "" ] ]
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1401.7190
Olivier Marquet
Olivier Marquet and Martin Larsson
Global wake instabilities of low aspect-ratio flate-plates
25 pages, 14 figures
null
10.1016/j.euromechflu.2014.05.005
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper investigates the linear destabilization of three-dimensional steady wakes developing behind flate plates placed normal to the incoming flow. Plates characterized by low length-to-width ratio $L$ are considered here. By varying this aspect ratio in the range $1 \le L \le 6$ three destabilization scenarios are identified. For very low aspect ratio $1 \le L \le 2$, the flow is first destabilized, when increasing the Reynolds number,by a steady global mode that breaks the top/bottom planar reflectional symmetry. The symmetric steady flow bifurcates, via a pitchfork bifurcation, towards an asymmetric steady wakes, similarly to the case of axisymmetric wakes behind sphere and disks. For long aspect ratio, $2.5 \le L \le 6$, the first unstable mode also breaks the top/bottom symmetry but is unsteady. A Hopf bifurcation occurs, as for the wake developing behind a two-dimensional circular cylinder. Finally an intermediate regime $2 \le L \le 2.5$ is found for which the flow gets first unstable to an unsteady mode that breaks the left/right planar reflectional symmetry.
[ { "created": "Tue, 28 Jan 2014 14:13:18 GMT", "version": "v1" } ]
2015-06-18
[ [ "Marquet", "Olivier", "" ], [ "Larsson", "Martin", "" ] ]
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1401.7191
Gordana Dodig Crnkovic
Gordana Dodig-Crnkovic
Modeling Life as Cognitive Info-Computation
Manuscript submitted to Computability in Europe CiE 2014
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cs.OH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This article presents a naturalist approach to cognition understood as a network of info-computational, autopoietic processes in living systems. It provides a conceptual framework for the unified view of cognition as evolved from the simplest to the most complex organisms, based on new empirical and theoretical results. It addresses three fundamental questions: what cognition is, how cognition works and what cognition does at different levels of complexity of living organisms. By explicating the info-computational character of cognition, its evolution, agent-dependency and generative mechanisms we can better understand its life-sustaining and life-propagating role. The info-computational approach contributes to rethinking cognition as a process of natural computation in living beings that can be applied for cognitive computation in artificial systems.
[ { "created": "Tue, 28 Jan 2014 14:14:18 GMT", "version": "v1" } ]
2014-01-29
[ [ "Dodig-Crnkovic", "Gordana", "" ] ]
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1401.7193
Hussein Abbass A
Antony W. Iorio, Hussein A. Abbass, Svetoslav Gaidow, Axel Bender
Visualizing Cognitive Moves for Assessing Information Perception Biases in Decision Making
null
null
null
null
cs.HC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In decision making a key source of uncertainty is people's perception of information which is influenced by their attitudes toward risk. Both, perception of information and risk attitude, affect the interpretation of information and hence the choice of suitable courses of action in a variety of contexts ranging from project planning to military operations. Visualization associated with the dynamics of cognitive states of people processing information and making decision is therefore not only important for analysis but has also significant practical applications, in particular in the military command and control domain. In this paper, we focus on a major concept that affect human cognition in this context: reliability of information. We introduce Cognitive Move Diagrams (CMD)---a simple visualization tool---to represent and evaluate the impact of this concept on decision making. We demonstrate through both a hypothetical example and a subject matter expert based experiment that CMD are effective in visualizing, detecting and qualifying human biases.
[ { "created": "Tue, 28 Jan 2014 14:25:15 GMT", "version": "v1" } ]
2014-01-29
[ [ "Iorio", "Antony W.", "" ], [ "Abbass", "Hussein A.", "" ], [ "Gaidow", "Svetoslav", "" ], [ "Bender", "Axel", "" ] ]
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1401.7211
Giulio Guzzinati
Giulio Guzzinati, Laura Clark, Armand B\'ech\'e, Jo Verbeeck
Measuring the Orbital Angular Momentum of Electron Beams
5 pages, 4 figurse
Phys. Rev. A 89, 025803 (2014)
10.1103/PhysRevA.89.025803
null
physics.optics physics.ins-det quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The recent demonstration of electron vortex beams has opened up the new possibility of studying orbital angular momentum (OAM) in the interaction between electron beams and matter. To this aim, methods to analyze the OAM of an electron beam are fundamentally important and a necessary next step. We demonstrate the measurement of electron beam OAM through a variety of techniques. The use of forked holographic masks, diffraction from geometric apertures, diffraction from a knife-edge and the application of an astigmatic lens are all experimentally demonstrated. The viability and limitations of each are discussed with supporting numerical simulations.
[ { "created": "Tue, 28 Jan 2014 15:14:29 GMT", "version": "v1" }, { "created": "Fri, 7 Feb 2014 13:55:30 GMT", "version": "v2" } ]
2014-02-18
[ [ "Guzzinati", "Giulio", "" ], [ "Clark", "Laura", "" ], [ "Béché", "Armand", "" ], [ "Verbeeck", "Jo", "" ] ]
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1401.7216
Felip Riera-Palou Dr.
Felip Riera-Palou
Reconfigurable Structures for Direct Equalisation in Mobile Receivers
PhD Thesis, University of Bradford (UK), 2002
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Any communication channel will usually distort the transmitted signal. This is especially true in the case of mobile systems, where multipath propagation causes the received signal to be seriously degraded. Over the years, many techniques have been proposed to combat channel effects. Two of the most popular are linear equalisation (LE) and decision feedback equalisation (DFE). These methods offer a good compromise between performance and computational complexity. LE and DFE are implemented using finite impulse response (FIR) filters whose frequency spectrum approximates the inverse of the channel spectrum plus noise. In mobile systems, the equaliser is made adaptable in order to be able to respond to the channel variations. Adaptability is achieved using adaptive FIR filters whose coefficients are iteratively updated. In principle, an infinite number of filter coefficients would be needed to achieve perfect channel inversion. In practice, the number of taps must be finite. Simulations show that, in realistic scenarios, making the equaliser longer than a certain (undetermined) number of taps will not yield any benefit. Moreover, computation and power will be wasted. In battery powered devices, like mobile terminals, it would be desirable to have the equaliser properly dimensioned. The equaliser's optimum length strongly depends on the particular scenario, and as channel conditions vary, this optimum is likely to vary. This thesis presents novel techniques to perform equaliser length adjustment. Methods for the LE and the DFE have been developed. Simulations in many different scenarios show that the proposed schemes optimise the number of taps to be used. Moreover, these techniques are able to detect changes in the channel and re-adjust the equaliser length appropriately.
[ { "created": "Tue, 28 Jan 2014 15:25:16 GMT", "version": "v1" } ]
2014-01-29
[ [ "Riera-Palou", "Felip", "" ] ]
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1401.7220
Daniel Marsden
Daniel Marsden
Category Theory Using String Diagrams
null
null
null
null
math.CT cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In work of Fokkinga and Meertens a calculational approach to category theory is developed. The scheme has many merits, but sacrifices useful type information in the move to an equational style of reasoning. By contrast, traditional proofs by diagram pasting retain the vital type information, but poorly express the reasoning and development of categorical proofs. In order to combine the strengths of these two perspectives, we propose the use of string diagrams, common folklore in the category theory community, allowing us to retain the type information whilst pursuing a calculational form of proof. These graphical representations provide a topological perspective on categorical proofs, and silently handle functoriality and naturality conditions that require awkward bookkeeping in more traditional notation. Our approach is to proceed primarily by example, systematically applying graphical techniques to many aspects of category theory. We develop string diagrammatic formulations of many common notions, including adjunctions, monads, Kan extensions, limits and colimits. We describe representable functors graphically, and exploit these as a uniform source of graphical calculation rules for many category theoretic concepts. These graphical tools are then used to explicitly prove many standard results in our proposed diagrammatic style.
[ { "created": "Tue, 28 Jan 2014 15:30:16 GMT", "version": "v1" }, { "created": "Sun, 9 Nov 2014 21:13:55 GMT", "version": "v2" } ]
2014-11-11
[ [ "Marsden", "Daniel", "" ] ]
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1401.7224
L. S. Schulman
Bernard Gaveau and Lawrence S. Schulman
Is ergodicity a reasonable hypothesis?
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null
null
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cond-mat.stat-mech physics.chem-ph physics.hist-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In the physics literature "ergodicity" is taken to mean that a system, including a macroscopic one, visits all microscopic states in a relatively short time. We show that this is an impossibility even if that time is billions of years. We also suggest that this feature does not contradict most physical considerations since those considerations deal with correlations of only a few particles.
[ { "created": "Sat, 25 Jan 2014 11:02:18 GMT", "version": "v1" } ]
2014-01-29
[ [ "Gaveau", "Bernard", "" ], [ "Schulman", "Lawrence S.", "" ] ]
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1401.7225
L. S. Schulman
B. Gaveau, L. Granger, M. Moreau, and L. S. Schulman
Relative entropy, interaction energy and the nature of dissipation
null
null
10.3390/e16063173
null
cond-mat.stat-mech math-ph math.MP physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Many thermodynamic relations involve inequalities, with equality if a process does not involve dissipation. In this article we provide equalities in which the dissipative contribution is shown to involve the relative entropy (a.k.a. Kullback-Leibler divergence). The processes considered are general time evolutions both in classical and quantum mechanics, and the initial state is sometimes thermal, sometimes partially so. By calculating a transport coefficient we show that indeed---at least in this case---the source of dissipation in that coefficient is the relative entropy.
[ { "created": "Mon, 27 Jan 2014 20:04:02 GMT", "version": "v1" } ]
2015-06-18
[ [ "Gaveau", "B.", "" ], [ "Granger", "L.", "" ], [ "Moreau", "M.", "" ], [ "Schulman", "L. S.", "" ] ]
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1401.7227
Haran Jackson
Haran Jackson, Michele Taroni, David Ponting
A Two-Level Variant of Additive Schwarz Preconditioning for Use in Reservoir Simulation
Submitted to Numerical Linear Algebra with Applications
null
null
null
math.NA cs.NA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The computation time for reservoir simulation is dominated by the linear solver. The sets of linear equations which arise in reservoir simulation have two distinctive features: the problems are usually highly anisotropic, with a dominant vertical flow direction, and the commonly used fully implicit method requires a simultaneous solution for pressure and saturation or molar concentration variables. These variables behave quite differently, with the pressure feeling long-range effects while the saturations vary locally. In this paper we review preconditioned iterative methods used for solving the linear system equations in reservoir simulation and their parallelisation. We then propose a variant of the classical additive Schwarz preconditioner designed to achieve better results on a large number of processors and discuss some directions for future research.
[ { "created": "Tue, 28 Jan 2014 15:43:58 GMT", "version": "v1" }, { "created": "Thu, 6 Feb 2014 00:18:32 GMT", "version": "v2" }, { "created": "Fri, 7 Feb 2014 01:58:01 GMT", "version": "v3" } ]
2014-02-10
[ [ "Jackson", "Haran", "" ], [ "Taroni", "Michele", "" ], [ "Ponting", "David", "" ] ]
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1401.7229
Rui Wang
Rui Wang and Xiaojun Yuan
MIMO Multiway Relaying with Pairwise Data Exchange: A Degrees of Freedom Perspective
13 pages, 7 figures
null
10.1109/TSP.2014.2347924
null
cs.IT math.IT
http://creativecommons.org/licenses/by/3.0/
In this paper, we study achievable degrees of freedom (DoF) of a multiple-input multiple-output (MIMO) multiway relay channel (mRC) where $K$ users, each equipped with $M$ antennas, exchange messages in a pairwise manner via a common $N$-antenna relay node. % A novel and systematic way of joint beamforming design at the users and at the relay is proposed to align signals for efficient implementation of physical-layer network coding (PNC). It is shown that, when the user number $K=3$, the proposed beamforming design can achieve the DoF capacity of the considered mRC for any $(M,N)$ setups. % For the scenarios with $K>3$, we show that the proposed signaling scheme can be improved by disabling a portion of relay antennas so as to align signals more efficiently. Our analysis reveals that the obtained achievable DoF is always piecewise linear, and is bounded either by the number of user antennas $M$ or by the number of relay antennas $N$. Further, we show that the DoF capacity can be achieved for $\frac{M}{N} \in \left(0,\frac{K-1}{K(K-2)} \right]$ and $\frac{M}{N} \in \left[\frac{1}{K(K-1)}+\frac{1}{2},\infty \right)$, which provides a broader range of the DoF capacity than the existing results. Asymptotic DoF as $K\rightarrow \infty$ is also derived based on the proposed signaling scheme.
[ { "created": "Tue, 28 Jan 2014 15:45:17 GMT", "version": "v1" }, { "created": "Wed, 27 Aug 2014 10:31:58 GMT", "version": "v2" } ]
2015-06-18
[ [ "Wang", "Rui", "" ], [ "Yuan", "Xiaojun", "" ] ]
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1401.7233
Arkadiusz Stopczynski Mr.
Arkadiusz Stopczynski, Vedran Sekara, Piotr Sapiezynski, Andrea Cuttone, Mette My Madsen, Jakob Eg Larsen, Sune Lehmann
Measuring large-scale social networks with high resolution
null
null
10.1371/journal.pone.0095978
null
cs.SI physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper describes the deployment of a large-scale study designed to measure human interactions across a variety of communication channels, with high temporal resolution and spanning multiple years - the Copenhagen Networks Study. Specifically, we collect data on face-to-face interactions, telecommunication, social networks, location, and background information (personality, demographic, health, politics) for a densely connected population of 1,000 individuals, using state-of-art smartphones as social sensors. Here we provide an overview of the related work and describe the motivation and research agenda driving the study. Additionally the paper details the data-types measured, and the technical infrastructure in terms of both backend and phone software, as well as an outline of the deployment procedures. We document the participant privacy procedures and their underlying principles. The paper is concluded with early results from data analysis, illustrating the importance of multi-channel high-resolution approach to data collection.
[ { "created": "Tue, 28 Jan 2014 15:49:39 GMT", "version": "v1" }, { "created": "Thu, 13 Feb 2014 19:22:30 GMT", "version": "v2" } ]
2014-06-10
[ [ "Stopczynski", "Arkadiusz", "" ], [ "Sekara", "Vedran", "" ], [ "Sapiezynski", "Piotr", "" ], [ "Cuttone", "Andrea", "" ], [ "Madsen", "Mette My", "" ], [ "Larsen", "Jakob Eg", "" ], [ "Lehmann", "Sune", "" ] ]
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1401.7234
Bruno Teheux
Bruno Teheux
Propositional dynamic logic for searching games with errors
null
null
null
null
cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We investigate some finitely-valued generalizations of propositional dynamic logic with tests. We start by introducing the (n+1)-valued Kripke models and a corresponding language based on a modal extension of {\L}ukasiewicz many-valued logic. We illustrate the definitions by providing a framework for an analysis of the R\'enyi - Ulam searching game with errors. Our main result is the axiomatization of the theory of the (n+1)-valued Kripke models. This result is obtained through filtration of the canonical model of the smallest (n+1)-valued propositional dynamic logic.
[ { "created": "Tue, 28 Jan 2014 15:49:42 GMT", "version": "v1" } ]
2014-01-29
[ [ "Teheux", "Bruno", "" ] ]
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1401.7239
Laura Sheble
Laura Sheble and Annie T. Chen
Contexts of diffusion: Adoption of research synthesis in Social Work and Women's Studies
To appear in proceedings of the 2014 International Conference on Social Computing, Behavioral-Cultural Modeling, and Prediction (SBP2014)
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cs.SI cs.DL physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Texts reveal the subjects of interest in research fields, and the values, beliefs, and practices of researchers. In this study, texts are examined through bibliometric mapping and topic modeling to provide a birds eye view of the social dynamics associated with the diffusion of research synthesis methods in the contexts of Social Work and Women's Studies. Research synthesis texts are especially revealing because the methods, which include meta-analysis and systematic review, are reliant on the availability of past research and data, sometimes idealized as objective, egalitarian approaches to research evaluation, fundamentally tied to past research practices, and performed with the goal informing future research and practice. This study highlights the co-influence of past and subsequent research within research fields; illustrates dynamics of the diffusion process; and provides insight into the cultural contexts of research in Social Work and Women's Studies. This study suggests the potential to further develop bibliometric mapping and topic modeling techniques to inform research problem selection and resource allocation.
[ { "created": "Tue, 28 Jan 2014 15:57:01 GMT", "version": "v1" } ]
2014-01-29
[ [ "Sheble", "Laura", "" ], [ "Chen", "Annie T.", "" ] ]
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1401.7249
Atif Khan
Atif Ali Khan, Oumair Naseer, Daciana Iliescu, Evor Hines
Fuzzy Controller Design for Assisted Omni-Directional Treadmill Therapy
Presented at: "The International Conference on Soft Computing and Software Engineering (SCSE 2013)" at San Francisco State University at Downtown Campus, in San Francisco, California, USA, March 1-2, 2013
The International Journal of Soft Computing and Software Engineering [JSCSE], Vol. 3, No. 3, pp. 30-37, 2013
10.7321/jscse.v3.n3.8
null
cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
One of the defining characteristic of human being is their ability to walk upright. Loss or restriction of such ability whether due to the accident, spine problem, stroke or other neurological injuries can cause tremendous stress on the patients and hence will contribute negatively to their quality of life. Modern research shows that physical exercise is very important for maintaining physical fitness and adopting a healthier life style. In modern days treadmill is widely used for physical exercises and training which enables the user to set up an exercise regime that can be adhered to irrespective of the weather conditions. Among the users of treadmills today are medical facilities such as hospitals, rehabilitation centres, medical and physiotherapy clinics etc. The process of assisted training or doing rehabilitation exercise through treadmill is referred to as treadmill therapy. A modern treadmill is an automated machine having built in functions and predefined features. Most of the treadmills used today are one dimensional and user can only walk in one direction. This paper presents the idea of using omnidirectional treadmills which will be more appealing to the patients as they can walk in any direction, hence encouraging them to do exercises more frequently. This paper proposes a fuzzy control design and possible implementation strategy to assist patients in treadmill therapy. By intelligently controlling the safety belt attached to the treadmill user, one can help them steering left, right or in any direction. The use of intelligent treadmill therapy can help patients to improve their walking ability without being continuously supervised by the specialists. The patients can walk freely within a limited space and the support system will provide continuous evaluation of their position and can adjust the control parameters of treadmill accordingly to provide best possible assistance.
[ { "created": "Fri, 24 Jan 2014 14:25:53 GMT", "version": "v1" } ]
2014-01-29
[ [ "Khan", "Atif Ali", "" ], [ "Naseer", "Oumair", "" ], [ "Iliescu", "Daciana", "" ], [ "Hines", "Evor", "" ] ]
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1401.7260
Joerg Evers
David W. Sch\"onleber, Martin G\"arttner, J\"org Evers
Coherent versus incoherent excitation dynamics in dissipative many-body Rydberg systems
10 pages, 10 figures
Phys. Rev. A 89, 033421 (2014)
10.1103/PhysRevA.89.033421
null
physics.atom-ph quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the impact of dephasing on the excitation dynamics of a cloud of ultracold two-level Rydberg atoms for both resonant and off-resonant laser excitation, using the wave function Monte Carlo (MCWF) technique. We find that while for resonant laser driving, dephasing mainly leads to an increase of the Rydberg population and a decrease of the Mandel Q parameter, at off-resonant driving strong dephasing toggles between direct excitation of pairs of atoms and subsequent excitation of single atoms, respectively. These two excitation mechanisms can be directly quantified via the pair correlation function, which shows strong suppression of the two-photon resonance peak for strong dephasing. Consequently, qualitatively different dynamics arise in the excitation statistics for weak and strong dephasing in off-resonant excitation. Our findings show that time-resolved excitation number measurements can serve as a powerful tool to identify the dominating process in the system's excitation dynamics.
[ { "created": "Tue, 28 Jan 2014 17:01:38 GMT", "version": "v1" } ]
2015-06-18
[ [ "Schönleber", "David W.", "" ], [ "Gärttner", "Martin", "" ], [ "Evers", "Jörg", "" ] ]
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1401.7261
Mohammad Kazemi
Mohammad Kazemi and Sahar Hashemgeloogerdi
On the Cooperative Communication over Cognitive Interference Channel
null
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we investigate the problem of communication over cognitive interference channel (CIC) with partially cooperating (PC) destinations (CIC-PC). This channel consists of two source nodes communicating two independent messages to their corresponding destination nodes. One of the sources, referred to as the cognitive source, has a noncausal knowledge of the message of the other source, referred to as the primary source. Each destination is assumed to decode only its intended message. In addition, the destination corresponding to the cognitive source assists the other destination by transmitting cooperative information through a relay link. We derive a new upper bound on the capacity region of discrete memoryless CI-CPC. Moreover, we characterize the capacity region for two new classes of this channel: (1) degraded CIC-PC, and (2) a class of semideterministic CIC-PC.
[ { "created": "Tue, 28 Jan 2014 17:01:50 GMT", "version": "v1" } ]
2014-01-29
[ [ "Kazemi", "Mohammad", "" ], [ "Hashemgeloogerdi", "Sahar", "" ] ]
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1401.7262
Marwa El Hefnawy
Marwa El Hefnawy and Gerhard Kramer
Impact of Spectrum Sharing on the Efficiency of Faster-Than-Nyquist Signaling
IEEE copyrights notice applies. This paper is accepted at WCNC 2014
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cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Capacity computations are presented for Faster-Than-Nyquist (FTN) signaling in the presence of interference from neighboring frequency bands. It is shown that Shannon's sinc pulses maximize the spectral efficiency for a multi-access channel, where spectral efficiency is defined as the sum rate in bits per second per Hertz. Comparisons using root raised cosine pulses show that the spectral efficiency decreases monotonically with the roll-off factor. At high signal-to-noise ratio, these pulses have an additive gap to capacity that increases monotonically with the roll-off factor.
[ { "created": "Tue, 28 Jan 2014 17:07:52 GMT", "version": "v1" } ]
2014-01-29
[ [ "Hefnawy", "Marwa El", "" ], [ "Kramer", "Gerhard", "" ] ]
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1401.7263
William Bradley
William F. Bradley
Superconcentration on a Pair of Butterflies
null
null
null
null
cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Suppose we concatenate two directed graphs, each isomorphic to a $d$ dimensional butterfly (but not necessarily identical to each other). Select any set of $2^k$ input and $2^k$ output nodes on the resulting graph. Then there exist node disjoint paths from the input nodes to the output nodes. If we take two standard butterflies and permute the order of the layers, then the result holds on sets of any size, not just powers of two.
[ { "created": "Tue, 28 Jan 2014 17:10:24 GMT", "version": "v1" } ]
2014-01-29
[ [ "Bradley", "William F.", "" ] ]
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1401.7266
Robert W. Johnson Jr
Robert W. Johnson
Remarks on the derivation and evaluation of the Stacey-Sigmar model for tokamak equilibrium
7 pages, revised. This paper has annoyed reviewers at two journals so far; let's see how many more get annoyed before it gets published
null
null
null
physics.plasm-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Stacey-Sigmar model for tokamak equilibrium as presented in the literature relies heavily on the neoclassical theory of the electrostatic field. Its neglect of Gauss's law is inconsistent with the potential formulation of electrodynamics. Its treatment of the dynamic electric field generated by the central heating and poloidal field coils also is suspect. Its derivation of the viscosity term remains incomplete and does not account for the varying pitch angle of the magnetic field. A derivation of the viscosity term which respects the pitch angle can account for the radial force commonly ascribed to the radial electrostatic field, thereby obviating the desire to neglect Gauss's law.
[ { "created": "Tue, 28 Jan 2014 17:23:37 GMT", "version": "v1" }, { "created": "Sat, 24 May 2014 14:35:31 GMT", "version": "v2" } ]
2014-05-27
[ [ "Johnson", "Robert W.", "" ] ]
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1401.7267
Jaewon Yang
Jaewon Yang, Julian McAuley, Jure Leskovec
Community Detection in Networks with Node Attributes
Published in the proceedings of IEEE ICDM '13
null
10.1109/ICDM.2013.167
null
cs.SI physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Community detection algorithms are fundamental tools that allow us to uncover organizational principles in networks. When detecting communities, there are two possible sources of information one can use: the network structure, and the features and attributes of nodes. Even though communities form around nodes that have common edges and common attributes, typically, algorithms have only focused on one of these two data modalities: community detection algorithms traditionally focus only on the network structure, while clustering algorithms mostly consider only node attributes. In this paper, we develop Communities from Edge Structure and Node Attributes (CESNA), an accurate and scalable algorithm for detecting overlapping communities in networks with node attributes. CESNA statistically models the interaction between the network structure and the node attributes, which leads to more accurate community detection as well as improved robustness in the presence of noise in the network structure. CESNA has a linear runtime in the network size and is able to process networks an order of magnitude larger than comparable approaches. Last, CESNA also helps with the interpretation of detected communities by finding relevant node attributes for each community.
[ { "created": "Tue, 28 Jan 2014 17:27:04 GMT", "version": "v1" } ]
2016-11-15
[ [ "Yang", "Jaewon", "" ], [ "McAuley", "Julian", "" ], [ "Leskovec", "Jure", "" ] ]
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1401.7273
Ali Al-Bashabsheh
Ali Al-Bashabsheh and Yongyi Mao
On Stochastic Estimation of Partition Function
null
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we show analytically that the duality of normal factor graphs (NFG) can facilitate stochastic estimation of partition functions. In particular, our analysis suggests that for the $q-$ary two-dimensional nearest-neighbor Potts model, sampling from the primal NFG of the model and sampling from its dual exhibit opposite behaviours with respect to the temperature of the model. For high-temperature models, sampling from the primal NFG gives rise to better estimators whereas for low-temperature models, sampling from the dual gives rise to better estimators. This analysis is validated by experiments.
[ { "created": "Tue, 28 Jan 2014 17:46:38 GMT", "version": "v1" } ]
2014-01-29
[ [ "Al-Bashabsheh", "Ali", "" ], [ "Mao", "Yongyi", "" ] ]
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1401.7276
Adrian Melott
Adrian L. Melott (University of Kansas)
Comment on: Comment on "Mysterious abrupt carbon-14 increase in coral contributed by a comet" Yi Liu et al
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astro-ph.EP astro-ph.HE astro-ph.SR physics.ao-ph physics.geo-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Unfortunately, Liu et al. contains a number of errors and omissions which compromise its conclusions. These have to do with the amount of 14C which is necessary to deposit in the atmosphere in order to see a perturbation like that in 774 AD, and the ability of a comet to do so.
[ { "created": "Tue, 28 Jan 2014 17:50:24 GMT", "version": "v1" } ]
2014-01-30
[ [ "Melott", "Adrian L.", "", "University of Kansas" ] ]
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1401.7277
Klaas Giesbertz
K. J. H. Giesbertz and R. van Leeuwen
Compact two-electron wave function for bond dissociation and Van der Waals interactions: A natural amplitude assessment
16 pages, 13 figures
J. Chem. Phys. 140, 184108 (2014)
10.1063/1.4875338
null
physics.chem-ph cond-mat.str-el physics.atom-ph physics.comp-ph quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Electron correlations in molecules can be divided in short range dynamical correlations, long range Van der Waals type interactions and near degeneracy static correlations. In this work we analyze for a one-dimensional model of a two-electron system how these three types of correlations can be incorporated in a simple wave function of restricted functional form consisting of an orbital product multiplied by a single correlation function $f(r_{12})$ depending on the interelectronic distance $r_{12}$. Since the three types of correlations mentioned lead to different signatures in terms of the natural orbital (NO) amplitudes in two-electron systems we make an analysis of the wave function in terms of the NO amplitudes for a model system of a diatomic molecule. In our numerical implementation we fully optimize the orbitals and the correlation function on a spatial grid without restrictions on their functional form. Due to this particular form of the wave function, we can prove that none of the amplitudes vanishes and moreover that it displays a distinct sign pattern and a series of avoided crossings as a function of the bond distance in agreement with the exact solution. This shows that the wave function Ansatz correctly incorporates the long range Van der Waals interactions. We further show that the approximate wave function gives an excellent binding curve and is able to describe static correlations. We show that in order to do this the correlation function $f(r_{12})$ needs to diverge for large $r_{12}$ at large internuclear distances while for shorter bond distances it increases as a function of $r_{12}$ to a maximum value after which it decays exponentially. We further give a physical interpretation of this behavior.
[ { "created": "Tue, 28 Jan 2014 17:51:15 GMT", "version": "v1" }, { "created": "Tue, 25 Mar 2014 07:36:32 GMT", "version": "v2" }, { "created": "Mon, 12 May 2014 15:00:22 GMT", "version": "v3" } ]
2014-05-13
[ [ "Giesbertz", "K. J. H.", "" ], [ "van Leeuwen", "R.", "" ] ]
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1401.7282
Serge Aubry
S. Aubry
A Unified Theory of Chemical Reactions
null
null
null
null
physics.chem-ph physics.bio-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose a new and general formalism for elementary chemical reactions where quantum electronic variables are used as reaction coordinates. This formalism is in principle applicable to all kinds of chemical reactions ionic or covalent. Our theory reveals the existence of an intermediate situation between ionic and covalent which may be almost barrierless and isoenegetic and which should be of high interest for understanding biochemistry.
[ { "created": "Tue, 28 Jan 2014 17:58:23 GMT", "version": "v1" } ]
2014-01-29
[ [ "Aubry", "S.", "" ] ]
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1401.7284
Janardhan Kulkarni
Nikhil Bansal, Janardhan Kulkarni
Minimizing Flow-Time on Unrelated Machines
The new version fixes some typos in the previous version. The paper is accepted for publication in STOC 2015
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cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider some flow-time minimization problems in the unrelated machines setting. In this setting, there is a set of $m$ machines and a set of $n$ jobs, and each job $j$ has a machine dependent processing time of $p_{ij}$ on machine $i$. The flow-time of a job is the total time the job spends in the system (completion time minus its arrival time), and is one of the most natural quality of service measure. We show the following two results: an $O(\min(\log^2 n,\log n \log P))$ approximation algorithm for minimizing the total-flow time, and an $O(\log n)$ approximation for minimizing the maximum flow-time. Here $P$ is the ratio of maximum to minimum job size. These are the first known poly-logarithmic guarantees for both the problems.
[ { "created": "Tue, 28 Jan 2014 18:09:20 GMT", "version": "v1" }, { "created": "Tue, 9 Jun 2015 23:01:10 GMT", "version": "v2" } ]
2015-06-11
[ [ "Bansal", "Nikhil", "" ], [ "Kulkarni", "Janardhan", "" ] ]
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1401.7287
Giulio Cimini
Giulio Cimini and Angel S\'anchez
Learning dynamics explains human behavior in Prisoner's Dilemma on networks
null
J. R. Soc. Interface. 2014 11 94 20131186
10.1098/rsif.2013.1186
null
physics.soc-ph cs.GT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Cooperative behavior lies at the very basis of human societies, yet its evolutionary origin remains a key unsolved puzzle. Whereas reciprocity or conditional cooperation is one of the most prominent mechanisms proposed to explain the emergence of cooperation in social dilemmas, recent experimental findings on networked Prisoner's Dilemma games suggest that conditional cooperation also depends on the previous action of the player---namely on the `mood' in which the player currently is. Roughly, a majority of people behaves as conditional cooperators if they cooperated in the past, while they ignore the context and free-ride with high probability if they did not. However, the ultimate origin of this behavior represents a conundrum itself. Here we aim specifically at providing an evolutionary explanation of moody conditional cooperation. To this end, we perform an extensive analysis of different evolutionary dynamics for players' behavioral traits---ranging from standard processes used in game theory based on payoff comparison to others that include non-economic or social factors. Our results show that only a dynamic built upon reinforcement learning is able to give rise to evolutionarily stable moody conditional cooperation, and at the end to reproduce the human behaviors observed in the experiments.
[ { "created": "Tue, 28 Jan 2014 18:16:25 GMT", "version": "v1" } ]
2016-03-22
[ [ "Cimini", "Giulio", "" ], [ "Sánchez", "Angel", "" ] ]
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1401.7288
Kenta Kasai
Kosuke Sakata, Kenta Kasai and Kohichi Sakaniwa
Spatially-Coupled Precoded Rateless Codes with Bounded Degree Achieve the Capacity of BEC under BP decoding
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cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Raptor codes are known as precoded rateless codes that achieve the capacity of BEC. However the maximum degree of Raptor codes needs to be unbounded to achieve the capacity. In this paper, we prove that spatially-coupled precoded rateless codes achieve the capacity with bounded degree under BP decoding.
[ { "created": "Tue, 28 Jan 2014 18:26:49 GMT", "version": "v1" } ]
2014-01-29
[ [ "Sakata", "Kosuke", "" ], [ "Kasai", "Kenta", "" ], [ "Sakaniwa", "Kohichi", "" ] ]
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1401.7289
Kenta Kasai
Takuya Okazaki and Kenta Kasai
Spatially-Coupled MacKay-Neal Codes with No Bit Nodes of Degree Two Achieve the Capacity of BEC
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null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Obata et al. proved that spatially-coupled (SC) MacKay-Neal (MN) codes achieve the capacity of BEC. However, the SC-MN codes codes have many variable nodes of degree two and have higher error floors. In this paper, we prove that SC-MN codes with no variable nodes of degree two achieve the capacity of BEC.
[ { "created": "Tue, 28 Jan 2014 18:26:51 GMT", "version": "v1" } ]
2014-01-29
[ [ "Okazaki", "Takuya", "" ], [ "Kasai", "Kenta", "" ] ]
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