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1401.7626
Jacob Langham
Jacob Langham, Irina Biktasheva, Dwight Barkley
Asymptotic dynamics of reflecting spiral waves
14 pages, 13 figures
Phys. Rev. E 90, 062902 (2014)
10.1103/PhysRevE.90.062902
null
nlin.PS physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Resonantly forced spiral waves in excitable media drift in straight-line paths, their rotation centers behaving as point-like objects moving along trajectories with a constant velocity. Interaction with medium boundaries alters this velocity and may often result in a reflection of the drift trajectory. Such reflections have diverse characteristics and are known to be highly nonspecular in general. In this context we apply the theory of response functions, which via numerically computable integrals, reduces the reaction-diffusion equations governing the whole excitable medium to the dynamics of just the rotation center and rotation phase of a spiral wave. Spiral reflection trajectories are computed by this method for both small- and large-core spiral waves in the Barkley model. Such calculations provide insight into the process of reflection as well as explanations for differences in trajectories across parameters, including the effects of incidence angle and forcing amplitude. Qualitative aspects of these results are preserved far beyond the asymptotic limit of weak boundary effects and slow resonant drift.
[ { "created": "Wed, 29 Jan 2014 19:11:33 GMT", "version": "v1" }, { "created": "Fri, 5 Dec 2014 18:49:50 GMT", "version": "v2" } ]
2014-12-08
[ [ "Langham", "Jacob", "" ], [ "Biktasheva", "Irina", "" ], [ "Barkley", "Dwight", "" ] ]
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1401.7631
Natalia Melnikova
N.B. Melnikova, D. Jordan, V.V. Krzhizhanovskaya, P.M.A. Sloot
Slope Instability of the Earthen Levee in Boston, UK: Numerical Simulation and Sensor Data Analysis
null
null
null
null
cs.CE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The paper presents a slope stability analysis for a heterogeneous earthen levee in Boston, UK, which is prone to occasional slope failures under tidal loads. Dynamic behavior of the levee under tidal fluctuations was simulated using a finite element model of variably saturated linear elastic perfectly plastic soil. Hydraulic conductivities of the soil strata have been calibrated according to piezometers readings, in order to obtain correct range of hydraulic loads in tidal mode. Finite element simulation was complemented with series of limit equilibrium analyses. Stability analyses have shown that slope failure occurs with the development of a circular slip surface located in the soft clay layer. Both models (FEM and LEM) confirm that the least stable hydraulic condition is the combination of the minimum river levels at low tide with the maximal saturation of soil layers. FEM results indicate that in winter time the levee is almost at its limit state, at the margin of safety (strength reduction factor values are 1.03 and 1.04 for the low-tide and high-tide phases, respectively); these results agree with real-life observations. The stability analyses have been implemented as real-time components integrated into the UrbanFlood early warning system for flood protection.
[ { "created": "Wed, 29 Jan 2014 19:27:24 GMT", "version": "v1" } ]
2014-01-30
[ [ "Melnikova", "N. B.", "" ], [ "Jordan", "D.", "" ], [ "Krzhizhanovskaya", "V. V.", "" ], [ "Sloot", "P. M. A.", "" ] ]
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1401.7635
Martin Monperrus
Benoit Baudry (INRIA - IRISA), Simon Allier (INRIA - IRISA), Martin Monperrus (INRIA Lille - Nord Europe)
Tailored Source Code Transformations to Synthesize Computationally Diverse Program Variants
null
Proceedings of the International Symposium on Software Testing and Analysis, 2014
10.1145/2610384.2610415
null
cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The predictability of program execution provides attackers a rich source of knowledge who can exploit it to spy or remotely control the program. Moving target defense addresses this issue by constantly switching between many diverse variants of a program, which reduces the certainty that an attacker can have about the program execution. The effectiveness of this approach relies on the availability of a large number of software variants that exhibit different executions. However, current approaches rely on the natural diversity provided by off-the-shelf components, which is very limited. In this paper, we explore the automatic synthesis of large sets of program variants, called sosies. Sosies provide the same expected functionality as the original program, while exhibiting different executions. They are said to be computationally diverse. This work addresses two objectives: comparing different transformations for increasing the likelihood of sosie synthesis (densifying the search space for sosies); demonstrating computation diversity in synthesized sosies. We synthesized 30184 sosies in total, for 9 large, real-world, open source applications. For all these programs we identified one type of program analysis that systematically increases the density of sosies; we measured computation diversity for sosies of 3 programs and found diversity in method calls or data in more than 40% of sosies. This is a step towards controlled massive unpredictability of software.
[ { "created": "Wed, 29 Jan 2014 19:35:42 GMT", "version": "v1" } ]
2021-11-12
[ [ "Baudry", "Benoit", "", "INRIA - IRISA" ], [ "Allier", "Simon", "", "INRIA - IRISA" ], [ "Monperrus", "Martin", "", "INRIA Lille - Nord Europe" ] ]
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1401.7637
Subhash Kak
Subhash Kak
Guaman Poma's Yupana and Inca Astronomy
11 pages, 15 figures
Indian Journal of History of Science, vol. 54.4, December 2019, pp. 397-404
null
null
physics.hist-ph physics.pop-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
An explanation is provided for the Inca counting board described by Guaman Poma in 1615. Although the board could have been used in more than one way, we show that based on certain reasonable assumptions regarding non-uniform representation of numbers its most likely use was counting in multiples of 6, 24, and 72. The independent numbers represented on its five rows are 92, 31, 29, 79, and 56 that appear to be astronomically connected to sub-periods within the year and planet periods in a manner similar to Mayan astronomy. Based on these and other considerations we propose that the board fulfilled an astronomical counting function.
[ { "created": "Wed, 29 Jan 2014 19:44:35 GMT", "version": "v1" }, { "created": "Mon, 17 Feb 2014 19:40:21 GMT", "version": "v2" } ]
2020-02-14
[ [ "Kak", "Subhash", "" ] ]
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1401.7651
O\u{g}uz Sunay
Volkan Yazici, M. Oguz Sunay, Ali O. Ercan
Controlling a Software-Defined Network via Distributed Controllers
6 pages, 4 figures
Proceedings of the 2012 NEM Summit, pp. 16-20, Istanbul, Turkey, October 16-18, 2012
null
null
cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we propose a distributed OpenFlow controller and an associated coordination framework that achieves scalability and reliability even under heavy data center loads. The proposed framework, which is designed to work with all existing OpenFlow controllers with minimal or no required changes, provides support for dynamic addition and removal of controllers to the cluster without any interruption to the network operation. We demonstrate performance results of the proposed framework implemented over an experimental testbed that uses controllers running Beacon.
[ { "created": "Wed, 29 Jan 2014 20:35:00 GMT", "version": "v1" } ]
2014-01-30
[ [ "Yazici", "Volkan", "" ], [ "Sunay", "M. Oguz", "" ], [ "Ercan", "Ali O.", "" ] ]
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1401.7655
Vadim Markel
Fan Zhao, John C. Schotland and Vadim A. Markel
Inversion of the star transform
Accepted to Inverse Problems in this form
Inverse Problems 30, 105001 (2014)
10.1088/0266-5611/30/10/105001
null
math-ph math.MP physics.med-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We define the star transform as a generalization of the broken ray transform introduced by us in previous work. The advantages of using the star transform include the possibility to reconstruct the absorption and the scattering coefficients of the medium separately and simultaneously (from the same data) and the possibility to utilize scattered radiation which, in the case of the conventional X-ray tomography, is discarded. In this paper, we derive the star transform from physical principles, discuss its mathematical properties and analyze numerical stability of inversion. In particular, it is shown that stable inversion of the star transform can be obtained only for configurations involving odd number of rays. Several computationally-efficient inversion algorithms are derived and tested numerically.
[ { "created": "Wed, 29 Jan 2014 20:43:32 GMT", "version": "v1" }, { "created": "Tue, 6 May 2014 21:56:10 GMT", "version": "v2" } ]
2015-01-13
[ [ "Zhao", "Fan", "" ], [ "Schotland", "John C.", "" ], [ "Markel", "Vadim A.", "" ] ]
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1401.7659
Joseph H. Thywissen
Dylan Jervis and Joseph H. Thywissen
Making an ultracold gas
16 pages, 2 figures. New version includes corrections, improved format, and hyperlinked references. To appear as Chapter 2 in "Quantum gas experiments - exploring many-body states," P. Torma, K. Sengstock, eds. (Imperial College Press, 2014)
null
10.1142/9781783264766_0002
null
cond-mat.quant-gas physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We provide an introduction to the experimental physics of quantum gases. At the low densities of ultracold quantum gases, confinement can be understood from single-particle physics, and interactions can be understood from two-body physics. The structure of atoms provides resonances both in the optical domain and in the radio-frequency domain. Atomic structure data is given for the 27 atomic isotopes that had been brought to quantum degeneracy at the time this chapter was written. We discuss the motivations behind choosing among these species. We review how static and oscillatory fields are treated mathematically. An electric dipole moment can be induced in a neutral atom, and is the basis for optical manipulation as well as short-range interactions. Many atoms have permanent magnetic dipole moments, which can be used for trapping or long-range interactions. The Toronto $^{40}$K/$^{87}$Rb lattice experiment provides an illustration of how these tools are combined to create an ultracold, quantum-degenerate gas.
[ { "created": "Wed, 29 Jan 2014 20:47:30 GMT", "version": "v1" }, { "created": "Mon, 24 Mar 2014 15:34:28 GMT", "version": "v2" } ]
2017-08-23
[ [ "Jervis", "Dylan", "" ], [ "Thywissen", "Joseph H.", "" ] ]
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1401.7662
Yaron Bromberg
Yaron Bromberg and Hui Cao
Generating non-Rayleigh speckles with tailored intensity statistics
Comments are welcome
Rev. Lett. 115, 213904 (2014)
10.1103/PhysRevLett.112.213904
null
physics.optics quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We experimentally generate speckle patterns with non-Rayleigh intensity statistics using a phase-only spatial light modulator. By introducing high order correlations to the input light fields we redistribute the intensity among the speckle grains, while preserving the granular structure of the pattern. Our method is versatile and allows for generating speckle patterns with enhanced or diminished contrast in a controlled manner.
[ { "created": "Wed, 29 Jan 2014 20:55:19 GMT", "version": "v1" }, { "created": "Thu, 20 Mar 2014 18:37:24 GMT", "version": "v2" } ]
2017-04-17
[ [ "Bromberg", "Yaron", "" ], [ "Cao", "Hui", "" ] ]
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1401.7694
Jason Gross
Jason Gross and Adam Chlipala and David I. Spivak
Experience Implementing a Performant Category-Theory Library in Coq
The final publication will be available at link.springer.com. This version includes a full bibliography which does not fit in the Springer version; other than the more complete references, this is the version submitted as a final copy to ITP 2014
null
10.1007/978-3-319-08970-6_18
null
math.CT cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We describe our experience implementing a broad category-theory library in Coq. Category theory and computational performance are not usually mentioned in the same breath, but we have needed substantial engineering effort to teach Coq to cope with large categorical constructions without slowing proof script processing unacceptably. In this paper, we share the lessons we have learned about how to represent very abstract mathematical objects and arguments in Coq and how future proof assistants might be designed to better support such reasoning. One particular encoding trick to which we draw attention allows category-theoretic arguments involving duality to be internalized in Coq's logic with definitional equality. Ours may be the largest Coq development to date that uses the relatively new Coq version developed by homotopy type theorists, and we reflect on which new features were especially helpful.
[ { "created": "Wed, 29 Jan 2014 22:29:29 GMT", "version": "v1" }, { "created": "Fri, 18 Apr 2014 00:11:11 GMT", "version": "v2" } ]
2022-05-04
[ [ "Gross", "Jason", "" ], [ "Chlipala", "Adam", "" ], [ "Spivak", "David I.", "" ] ]
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Experience Implementing a Performant Category-Theory Library in Coq
https://arxiv.org/abs/1401.7694v2
https://arxiv.org/pdf/1401.7694v2.pdf
https://github.com/agda/agda-categories
false
false
https://paperswithcode.com/paper/experience-implementing-a-performant-category
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1401.7698
Philip Morrison
Z. Yoshida and P. J. Morrison
A hierarchy of noncanonical Hamiltonian systems: circulation laws in an extended phase space
null
Fluid Dyn. Res. 46 (2014) 031412
10.1088/0169-5983/46/3/031412
null
math-ph math.DG math.DS math.MP physics.flu-dyn physics.plasm-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The dynamics of an ideal fluid or plasma is constrained by topological invariants such as the circulation of (canonical) momentum or, equivalently, the flux of the vorticity or magnetic fields. In the Hamiltonian formalism, topological invariants restrict the orbits to submanifolds of the phase space. While the coadjoint orbits have a natural symplectic structure, the global geometry of the degenerate (constrained) Poisson manifold can be very complex. Some invariants are represented by the center of the Poisson algebra (i.e., the Casimir elements such as the helicities), and then, the global structure of phase space is delineated by Casimir leaves. However, a general constraint is not necessarily integrable, which precludes the existence of an appropriate Casimir element; the circulation is an example of such an invariant. In this work, we formulate a systematic method to embed a Hamiltonian system in an extended phase space; we introduce mock fields and extend the Poisson algebra so that the mock fields are Lie-dragged by the flow vector. A mock field defines a new Casimir element, a cross helicity, which represents topological constraints including the circulation. Unearthing a Casimir element brings about immense advantage in the study of dynamics and equilibria -- the so-called energy-Casimir method becomes ready available. Yet, a mock field does not a priori have a physical meaning. Here we proffer an interpretation of a Casimir element obtained, e.g., by such a construction as an adiabatic invariant associated with a hidden "microscopic" angle variable, and in this way give the mock field a physical meaning. We proceed further and consider a perturbation of the Hamiltonian by a canonical pair, composed of the Casimir element and the angle, that causes the topological constraint to be unfrozen. The theory is applied to the tearing modes of MHD.
[ { "created": "Wed, 29 Jan 2014 23:12:43 GMT", "version": "v1" } ]
2015-06-18
[ [ "Yoshida", "Z.", "" ], [ "Morrison", "P. J.", "" ] ]
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1401.7699
Albert Roura
Albert Roura, Wolfgang Zeller and Wolfgang P. Schleich
Overcoming loss of contrast in atom interferometry due to gravity gradients
14+7 pages including appendices, 9 figures; v2 minor changes, matches published version
New J. Phys. 16, 123012 (2014)
10.1088/1367-2630/16/12/123012
null
physics.atom-ph gr-qc quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Long-time atom interferometry is instrumental to various high-precision measurements of fundamental physical properties, including tests of the equivalence principle. Due to rotations and gravity gradients, the classical trajectories characterizing the motion of the wave packets for the two branches of the interferometer do not close in phase space, an effect which increases significantly with the interferometer time. The relative displacement between the interfering wave packets in such open interferometers leads to a fringe pattern in the density profile at each exit port and a loss of contrast in the oscillations of the integrated particle number as a function of the phase shift. Paying particular attention to gravity gradients, we present a simple mitigation strategy involving small changes in the timing of the laser pulses which is very easy to implement. A useful representation-free description of the state evolution in an atom interferometer is introduced and employed to analyze the loss of contrast and mitigation strategy in the general case. (As a by-product, a remarkably compact derivation of the phase-shift in a general light-pulse atom interferometer is provided.) Furthermore, exact results are obtained for (pure and mixed) Gaussian states which allow a simple interpretation in terms of the alignment of Wigner functions in phase-space. Analytical results are also obtained for expanding Bose-Einstein condensates within the time-dependent Thomas-Fermi approximation. Finally, a combined strategy for rotations and nonaligned gravity gradients is considered as well.
[ { "created": "Wed, 29 Jan 2014 23:18:01 GMT", "version": "v1" }, { "created": "Fri, 10 Jul 2015 13:47:13 GMT", "version": "v2" } ]
2015-07-13
[ [ "Roura", "Albert", "" ], [ "Zeller", "Wolfgang", "" ], [ "Schleich", "Wolfgang P.", "" ] ]
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1401.7700
Haris Aziz
Haris Aziz
Random assignment with multi-unit demands
17 pages
null
null
null
cs.GT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider the multi-unit random assignment problem in which agents express preferences over objects and objects are allocated to agents randomly based on the preferences. The most well-established preference relation to compare random allocations of objects is stochastic dominance (SD) which also leads to corresponding notions of envy-freeness, efficiency, and weak strategyproofness. We show that there exists no rule that is anonymous, neutral, efficient and weak strategyproof. For single-unit random assignment, we show that there exists no rule that is anonymous, neutral, efficient and weak group-strategyproof. We then study a generalization of the PS (probabilistic serial) rule called multi-unit-eating PS and prove that multi-unit-eating PS satisfies envy-freeness, weak strategyproofness, and unanimity.
[ { "created": "Wed, 29 Jan 2014 23:19:54 GMT", "version": "v1" }, { "created": "Thu, 15 Jan 2015 03:45:09 GMT", "version": "v2" }, { "created": "Fri, 19 Jun 2015 09:51:42 GMT", "version": "v3" } ]
2015-06-22
[ [ "Aziz", "Haris", "" ] ]
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1401.7702
Benjamin Miller
Benjamin A. Miller, Michelle S. Beard, Patrick J. Wolfe, and Nadya T. Bliss
A Spectral Framework for Anomalous Subgraph Detection
In submission to the IEEE, 16 pages, 8 figures
IEEE Trans. Signal Process. 63 (2015) 4191-4206
10.1109/TSP.2015.2437841
null
cs.SI stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A wide variety of application domains are concerned with data consisting of entities and their relationships or connections, formally represented as graphs. Within these diverse application areas, a common problem of interest is the detection of a subset of entities whose connectivity is anomalous with respect to the rest of the data. While the detection of such anomalous subgraphs has received a substantial amount of attention, no application-agnostic framework exists for analysis of signal detectability in graph-based data. In this paper, we describe a framework that enables such analysis using the principal eigenspace of a graph's residuals matrix, commonly called the modularity matrix in community detection. Leveraging this analytical tool, we show that the framework has a natural power metric in the spectral norm of the anomalous subgraph's adjacency matrix (signal power) and of the background graph's residuals matrix (noise power). We propose several algorithms based on spectral properties of the residuals matrix, with more computationally expensive techniques providing greater detection power. Detection and identification performance are presented for a number of signal and noise models, including clusters and bipartite foregrounds embedded into simple random backgrounds as well as graphs with community structure and realistic degree distributions. The trends observed verify intuition gleaned from other signal processing areas, such as greater detection power when the signal is embedded within a less active portion of the background. We demonstrate the utility of the proposed techniques in detecting small, highly anomalous subgraphs in real graphs derived from Internet traffic and product co-purchases.
[ { "created": "Wed, 29 Jan 2014 23:39:39 GMT", "version": "v1" }, { "created": "Wed, 22 Oct 2014 04:01:00 GMT", "version": "v2" } ]
2016-09-06
[ [ "Miller", "Benjamin A.", "" ], [ "Beard", "Michelle S.", "" ], [ "Wolfe", "Patrick J.", "" ], [ "Bliss", "Nadya T.", "" ] ]
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1401.7709
Deepayan Chakrabarti
Deepayan Chakrabarti, Stanislav Funiak, Jonathan Chang, Sofus A. Macskassy
Joint Inference of Multiple Label Types in Large Networks
null
null
null
null
cs.LG cs.SI stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We tackle the problem of inferring node labels in a partially labeled graph where each node in the graph has multiple label types and each label type has a large number of possible labels. Our primary example, and the focus of this paper, is the joint inference of label types such as hometown, current city, and employers, for users connected by a social network. Standard label propagation fails to consider the properties of the label types and the interactions between them. Our proposed method, called EdgeExplain, explicitly models these, while still enabling scalable inference under a distributed message-passing architecture. On a billion-node subset of the Facebook social network, EdgeExplain significantly outperforms label propagation for several label types, with lifts of up to 120% for recall@1 and 60% for recall@3.
[ { "created": "Thu, 30 Jan 2014 00:38:53 GMT", "version": "v1" } ]
2014-01-31
[ [ "Chakrabarti", "Deepayan", "" ], [ "Funiak", "Stanislav", "" ], [ "Chang", "Jonathan", "" ], [ "Macskassy", "Sofus A.", "" ] ]
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1401.7713
Lingqiao Liu
Lingqiao Liu, Lei Wang, Chunhua Shen
A Generalized Probabilistic Framework for Compact Codebook Creation
null
null
null
null
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Compact and discriminative visual codebooks are preferred in many visual recognition tasks. In the literature, a number of works have taken the approach of hierarchically merging visual words of an initial large-sized codebook, but implemented this approach with different merging criteria. In this work, we propose a single probabilistic framework to unify these merging criteria, by identifying two key factors: the function used to model class-conditional distribution and the method used to estimate the distribution parameters. More importantly, by adopting new distribution functions and/or parameter estimation methods, our framework can readily produce a spectrum of novel merging criteria. Three of them are specifically focused in this work. In the first criterion, we adopt the multinomial distribution with Bayesian method; In the second criterion, we integrate Gaussian distribution with maximum likelihood parameter estimation. In the third criterion, which shows the best merging performance, we propose a max-margin-based parameter estimation method and apply it with multinomial distribution. Extensive experimental study is conducted to systematically analyse the performance of the above three criteria and compare them with existing ones. As demonstrated, the best criterion obtained in our framework achieves the overall best merging performance among the comparable merging criteria developed in the literature.
[ { "created": "Thu, 30 Jan 2014 01:02:50 GMT", "version": "v1" } ]
2014-01-31
[ [ "Liu", "Lingqiao", "" ], [ "Wang", "Lei", "" ], [ "Shen", "Chunhua", "" ] ]
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1401.7714
Francois Le Gall
Fran\c{c}ois Le Gall
Powers of Tensors and Fast Matrix Multiplication
28 pages
Proceedings of the 39th International Symposium on Symbolic and Algebraic Computation (ISSAC 2014), pp. 296-303, 2014
10.1145/2608628.2627493
null
cs.DS cs.CC cs.SC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper presents a method to analyze the powers of a given trilinear form (a special kind of algebraic constructions also called a tensor) and obtain upper bounds on the asymptotic complexity of matrix multiplication. Compared with existing approaches, this method is based on convex optimization, and thus has polynomial-time complexity. As an application, we use this method to study powers of the construction given by Coppersmith and Winograd [Journal of Symbolic Computation, 1990] and obtain the upper bound $\omega<2.3728639$ on the exponent of square matrix multiplication, which slightly improves the best known upper bound.
[ { "created": "Thu, 30 Jan 2014 01:11:22 GMT", "version": "v1" } ]
2021-10-05
[ [ "Gall", "François Le", "" ] ]
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null
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1401.7715
Jianing Shi
Jianing V. Shi, Wotao Yin, Aswin C. Sankaranarayanan, and Richard G. Baraniuk
Video Compressive Sensing for Dynamic MRI
30 pages, 9 figures
null
null
null
cs.CV math.OC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a video compressive sensing framework, termed kt-CSLDS, to accelerate the image acquisition process of dynamic magnetic resonance imaging (MRI). We are inspired by a state-of-the-art model for video compressive sensing that utilizes a linear dynamical system (LDS) to model the motion manifold. Given compressive measurements, the state sequence of an LDS can be first estimated using system identification techniques. We then reconstruct the observation matrix using a joint structured sparsity assumption. In particular, we minimize an objective function with a mixture of wavelet sparsity and joint sparsity within the observation matrix. We derive an efficient convex optimization algorithm through alternating direction method of multipliers (ADMM), and provide a theoretical guarantee for global convergence. We demonstrate the performance of our approach for video compressive sensing, in terms of reconstruction accuracy. We also investigate the impact of various sampling strategies. We apply this framework to accelerate the acquisition process of dynamic MRI and show it achieves the best reconstruction accuracy with the least computational time compared with existing algorithms in the literature.
[ { "created": "Thu, 30 Jan 2014 01:18:26 GMT", "version": "v1" }, { "created": "Sat, 1 Feb 2014 22:50:51 GMT", "version": "v2" } ]
2014-02-04
[ [ "Shi", "Jianing V.", "" ], [ "Yin", "Wotao", "" ], [ "Sankaranarayanan", "Aswin C.", "" ], [ "Baraniuk", "Richard G.", "" ] ]
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1401.7717
Hatem Abou-zeid
Hatem Abou-zeid and Hossam S. Hassanein
Predictive Green Wireless Access: Exploiting Mobility and Application Information
null
IEEE Wireless Communications Magazine, vol. 20, no. 5, pp. 92-99, Oct. 2013
10.1109/MWC.2013.6664479
null
cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The ever increasing mobile data traffic and dense deployment of wireless networks have made energy efficient radio access imperative. As networks are designed to satisfy peak user demands, radio access energy can be reduced in a number of ways at times of lower demand. This includes putting base stations (BSs) to intermittent short sleep modes during low load, as well as adaptively powering down select BSs completely where demand is low for prolonged time periods. In order to fully exploit such energy conserving mechanisms, networks should be aware of the user temporal and spatial traffic demands. To this end, this article investigates the potential of utilizing predictions of user location and application information as a means to energy saving. We discuss the development of a predictive green wireless access (PreGWA) framework and identify its key functional entities and their interaction. To demonstrate the potential energy savings we then provide a case study on stored video streaming and illustrate how exploiting predictions can minimize BS resource consumption within a single cell, and across a network of cells. Finally, to emphasize the practical potential of PreGWA, we present a distributed heuristic that reduces resource consumption significantly without requiring considerable information or signaling overhead.
[ { "created": "Thu, 30 Jan 2014 02:18:54 GMT", "version": "v1" } ]
2014-01-31
[ [ "Abou-zeid", "Hatem", "" ], [ "Hassanein", "Hossam S.", "" ] ]
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1401.7720
Erneson Oliveira
E. A. Oliveira, J. S. Andrade Jr. and H. A. Makse
Large cities are less green
null
Oliveira, E. A., Andrade Jr., J. S. and Makse, H. A. Large Cities are less green. Sci. Rep. 4, 4235 (2014)
10.1038/srep04235
null
physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study how urban quality evolves as a result of carbon dioxide emissions as urban agglomerations grow. We employ a bottom-up approach combining two unprecedented microscopic data on population and carbon dioxide emissions in the continental US. We first aggregate settlements that are close to each other into cities using the City Clustering Algorithm (CCA) defining cities beyond the administrative boundaries. Then, we use data on $\rm{CO}_2$ emissions at a fine geographic scale to determine the total emissions of each city. We find a superlinear scaling behavior, expressed by a power-law, between $\rm{CO}_2$ emissions and city population with average allometric exponent $\beta = 1.46$ across all cities in the US. This result suggests that the high productivity of large cities is done at the expense of a proportionally larger amount of emissions compared to small cities. Furthermore, our results are substantially different from those obtained by the standard administrative definition of cities, i.e. Metropolitan Statistical Area (MSA). Specifically, MSAs display isometric scaling emissions and we argue that this discrepancy is due to the overestimation of MSA areas. The results suggest that allometric studies based on administrative boundaries to define cities may suffer from endogeneity bias.
[ { "created": "Thu, 30 Jan 2014 02:52:34 GMT", "version": "v1" }, { "created": "Mon, 16 Jun 2014 22:43:51 GMT", "version": "v2" } ]
2014-09-15
[ [ "Oliveira", "E. A.", "" ], [ "Andrade", "J. S.", "Jr." ], [ "Makse", "H. A.", "" ] ]
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1401.7727
Benjamin Rubinstein
Battista Biggio and Igino Corona and Blaine Nelson and Benjamin I. P. Rubinstein and Davide Maiorca and Giorgio Fumera and Giorgio Giacinto and and Fabio Roli
Security Evaluation of Support Vector Machines in Adversarial Environments
47 pages, 9 figures; chapter accepted into book 'Support Vector Machine Applications'
null
null
null
cs.LG cs.CR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Support Vector Machines (SVMs) are among the most popular classification techniques adopted in security applications like malware detection, intrusion detection, and spam filtering. However, if SVMs are to be incorporated in real-world security systems, they must be able to cope with attack patterns that can either mislead the learning algorithm (poisoning), evade detection (evasion), or gain information about their internal parameters (privacy breaches). The main contributions of this chapter are twofold. First, we introduce a formal general framework for the empirical evaluation of the security of machine-learning systems. Second, according to our framework, we demonstrate the feasibility of evasion, poisoning and privacy attacks against SVMs in real-world security problems. For each attack technique, we evaluate its impact and discuss whether (and how) it can be countered through an adversary-aware design of SVMs. Our experiments are easily reproducible thanks to open-source code that we have made available, together with all the employed datasets, on a public repository.
[ { "created": "Thu, 30 Jan 2014 03:37:18 GMT", "version": "v1" } ]
2014-01-31
[ [ "Biggio", "Battista", "" ], [ "Corona", "Igino", "" ], [ "Nelson", "Blaine", "" ], [ "Rubinstein", "Benjamin I. P.", "" ], [ "Maiorca", "Davide", "" ], [ "Fumera", "Giorgio", "" ], [ "Giacinto", "Giorgio", "" ], [ "Roli", "and Fabio", "" ] ]
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1401.7728
Jacques H.H. Perk
Jacques H.H. Perk
A Simple Method to Reduce Thermodynamic Derivatives by Computer
LaTeX, uses revtex, 4 pages
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null
null
physics.comp-ph physics.ed-ph physics.hist-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Studies in thermodynamics often require the reduction of some first or second order partial derivatives in terms of a smaller basic set. A simple algorithm to perform such a reduction is presented here, together with a review of earlier related works. The algorithm uses Jacobians and is written in Maple language, but it is easily translated in terms of any other computer algebra language.
[ { "created": "Thu, 9 Jan 2014 20:13:37 GMT", "version": "v1" } ]
2014-02-11
[ [ "Perk", "Jacques H. H.", "" ] ]
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1401.7733
Sunil Kumar c
C.Sunil Kumar, J.Seetha, S.R.Vinotha
Security Implications of Distributed Database Management System Models
null
null
null
null
cs.DB
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Security features must be addressed when escalating a distributed database. The choice between the object oriented and the relational data model, several factors should be considered. The most important of these factors are single and multilevel access controls (MAC), protection and integrity maintenance. While determining which distributed database replica will be more secure for a particular function, the choice should not be made exclusively on the basis of available security features. One should also query the effectiveness and efficiency of the delivery of these characteristics. In this paper, the security strengths and weaknesses of both database models and the thorough problems initiate in the distributed environment are conversed.
[ { "created": "Thu, 30 Jan 2014 04:43:22 GMT", "version": "v1" } ]
2014-01-31
[ [ "Kumar", "C. Sunil", "" ], [ "Seetha", "J.", "" ], [ "Vinotha", "S. R.", "" ] ]
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1401.7734
Masud Mansuripur
Masud Mansuripur
Radiation pressure and the linear momentum of the electromagnetic field in magnetic media
16 pages, 5 figures, 48 equations, 24 references
Published in Optics Express, Vol. 15, No. 21, pp 13502-13517 (2007)
10.1364/OE.15.013502
null
physics.optics physics.class-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We examine the force of the electromagnetic radiation on linear, isotropic, homogeneous media specified in terms of their permittivity epsilon and permeability mu. A formula is proposed for the electromagnetic Lorentz force on the magnetization M, which is treated here as an Amperian current loop. Using the proposed formula, we demonstrate conservation of momentum in several cases that are amenable to rigorous analysis based on the classical Maxwell equations, the Lorentz law of force, and the constitutive relations. Our analysis yields precise expressions for the density of the electromagnetic and mechanical momenta inside the media that are specified by their (epsilon, mu) parameters. An interesting consequence of this analysis is the identification of an "intrinsic" mechanical momentum density, ExM/c^2, analogous to the electromagnetic (or Abraham) momentum density, ExH/c^2. (Here E and H are the magnitudes of the electric and magnetic fields, respectively, and c is the speed of light in vacuum.) This intrinsic mechanical momentum, associated with the magnetization M in the presence of an electric field E, is apparently the same "hidden" momentum that was predicted by W. Shockley and R.P. James nearly four decades ago.
[ { "created": "Thu, 30 Jan 2014 04:48:42 GMT", "version": "v1" } ]
2014-01-31
[ [ "Mansuripur", "Masud", "" ] ]
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1401.7735
Nitesh Goyal
Anuj Tewari, Nitesh Goyal, Matthew K Chan, Tina Yau, John Canny, Ulrik Schroeder
SPRING: speech and pronunciation improvement through games, for Hispanic children
ACM ICTD 2010
null
10.1145/2369220.2369265
null
cs.HC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Lack of proper English pronunciations is a major problem for immigrant population in developed countries like U.S. This poses various problems, including a barrier to entry into mainstream society. This paper presents a research study that explores the use of speech technologies merged with activity-based and arcade-based games to do pronunciation feedback for Hispanic children within the U.S. A 3-month long study with immigrant population in California was used to investigate and analyze the effectiveness of computer aided pronunciation feedback through games. In addition to quantitative findings that point to statistically significant gains in pronunciation quality, the paper also explores qualitative findings, interaction patterns and challenges faced by the researchers in dealing with this community. It also describes the issues involved in dealing with pronunciation as a competency.
[ { "created": "Thu, 30 Jan 2014 04:50:19 GMT", "version": "v1" } ]
2019-02-12
[ [ "Tewari", "Anuj", "" ], [ "Goyal", "Nitesh", "" ], [ "Chan", "Matthew K", "" ], [ "Yau", "Tina", "" ], [ "Canny", "John", "" ], [ "Schroeder", "Ulrik", "" ] ]
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1401.7739
Ian Petersen
A. Lanzon and I. R. Petersen
Stability robustness of a feedback interconnection of systems with negative imaginary frequency response
null
IEEE Transactions on Automatic Control, vol 53, no 4, pp 1042-1046 2008
null
null
math.OC cs.SY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A necessary and sufficient condition, expressed simply as the DC loop gain (ie the loop gain at zero frequency) being less than unity, is given in this paper to guarantee the internal stability of a feedback interconnection of Linear Time-Invariant (LTI) Multiple-Input Multiple-Output (MIMO) systems with negative imaginary frequency response. Systems with negative imaginary frequency response arise for example when considering transfer functions from force actuators to co-located position sensors, and are commonly important in for example lightly damped structures. The key result presented here has similar application to the small-gain theorem, which refers to the stability of feedback interconnections of contractive gain systems, and the passivity theorem (or more precisely the positive real theorem in the LTI case), which refers to the stability of feedback interconnections of positive real systems. A complete state-space characterisation of systems with negative imaginary frequency response is also given in this paper and also an example that demonstrates the application of the key result is provided.
[ { "created": "Thu, 30 Jan 2014 05:09:46 GMT", "version": "v1" } ]
2014-01-31
[ [ "Lanzon", "A.", "" ], [ "Petersen", "I. R.", "" ] ]
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1401.7741
Mevlut Bulut Dr
Mevlut Bulut
ReducedCBT and SuperCBT, Two New and Improved Complete Binary Tree Structures
12 pages research paper, contains 6 figures and a table
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null
null
cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Between the leaves and the nodes of a complete binary tree, a separate parent-child-sister hierarchy is employed independent of the parent-child-sister hierarchy used for the rest of the tree. Two different versions of such a local hierarchy are introduced. The result of the first proposed hierarchy is a faster and smaller footprint, while the second one provides the size variation functionality without a significant computational overhead. This novel approach brings considerable memory gains and performance boosts to the complete binary tree based algorithms.
[ { "created": "Thu, 30 Jan 2014 05:16:01 GMT", "version": "v1" } ]
2014-01-31
[ [ "Bulut", "Mevlut", "" ] ]
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1401.7743
Balaji T
T.Balaji and Dr.M.Sumathi
Effective Features of Remote Sensing Image Classification Using Interactive Adaptive Thresholding Method
5 pages,International Conference on Intelligent Computing Applications - ICICA 2014
null
null
null
cs.CV
http://creativecommons.org/licenses/by-nc-sa/3.0/
Remote sensing image classification can be performed in many different ways to extract meaningful features. One common approach is to perform edge detection. A second approach is to try and detect whole shapes, given the fact that these shapes usually tend to have distinctive properties such as object foreground or background. To get optimal results, these two approaches can be combined. This paper adopts a combinatorial optimization method to adaptively select threshold based features to improve remote sensing image. Feature selection is an important combinatorial optimization problem in the remote sensing image classification. The feature selection method has to achieve three characteristics: first the performance issues by facilitating data collection and reducing storage space and classification time, second to perform semantics analysis helping to understand the problem, and third to improve prediction accuracy by avoiding the curse of dimensionality. The goal of this thresholding an image is to classify pixels as either dark or light and evaluation of classification results. Interactive adaptive thresholding is a form of thresholding that takes into account spatial variations in illumination of remote sensing image. We present a technique for remote sensing based adaptive thresholding using the interactive satellite image of the input. However, our solution is more robust to illumination changes in the remote sensing image. Additionally, our method is simple and easy to implement but it is effective algorithm to classify the image pixels. This technique is suitable for preprocessing the remote sensing image classification, making it a valuable tool for interactive remote based applications such as augmented reality of the classification procedure.
[ { "created": "Thu, 30 Jan 2014 05:33:27 GMT", "version": "v1" } ]
2014-01-31
[ [ "Balaji", "T.", "" ], [ "Sumathi", "Dr. M.", "" ] ]
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1401.7745
Ian Petersen
Ian R. Petersen and Alexander Lanzon
Feedback Control of Negative-Imaginary Systems: Large Flexible structures with colocated actuators and sensors
null
Control Systems Magazine, vol. 30, no. 5, pp. 54 - 72, 2010
null
null
cs.SY math.OC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper presents a survey of recent results on the theory of negative imaginary systems. This theory can be applied to the robust control of large flexible structures with colocated force actuators and position sensors.
[ { "created": "Thu, 30 Jan 2014 05:40:41 GMT", "version": "v1" } ]
2014-01-31
[ [ "Petersen", "Ian R.", "" ], [ "Lanzon", "Alexander", "" ] ]
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1401.7747
Alexander Romanenko
A. Romanenko, A. Grassellino, O. Melnychuk, D. A. Sergatskov
Dependence of the residual surface resistance of superconducting RF cavities on the cooling dynamics around $T_\mathrm{c}$
null
null
10.1063/1.4875655
null
physics.acc-ph cond-mat.supr-con
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We report a strong effect of the cooling dynamics through $T_\mathrm{c}$ on the amount of trapped external magnetic flux in superconducting niobium cavities. The effect is similar for fine grain and single crystal niobium and all surface treatments including electropolishing with and without 120$^\circ$C baking and nitrogen doping. Direct magnetic field measurements on the cavity walls show that the effect stems from changes in the flux trapping efficiency: slow cooling leads to almost complete flux trapping and higher residual resistance while fast cooling leads to the much more efficient flux expulsion and lower residual resistance.
[ { "created": "Thu, 30 Jan 2014 05:44:32 GMT", "version": "v1" }, { "created": "Mon, 3 Feb 2014 22:29:39 GMT", "version": "v2" }, { "created": "Fri, 7 Mar 2014 22:18:01 GMT", "version": "v3" } ]
2015-06-18
[ [ "Romanenko", "A.", "" ], [ "Grassellino", "A.", "" ], [ "Melnychuk", "O.", "" ], [ "Sergatskov", "D. A.", "" ] ]
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1401.7753
Barbara Obryk
Barbara Obryk, Paola Batistoni, Sean Conroy, Brian D. Syme, Sergey Popovichev, Ion E. Stamatelatos, Theodora Vasilopoulou, Pawe{\l} Bilski and JET EFDA Contributors
Thermoluminescence measurements of neutron streaming through JET Torus Hall ducts
Presented at the 11th International Symposium on Fusion Nuclear Technology (ISFNT), held in Barcelona, Spain, from 16-20 September 2013
null
10.1016/j.fusengdes.2013.12.045
null
physics.ins-det
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Thermoluminescence detectors (TLD) were used for dose measurements at JET. Several hundreds of LiF detectors of various types, standard LiF:Mg,Ti and highly sensitive LiF:Mg,Cu,P were produced. LiF detectors consisting of natural lithium are sensitive to slow neutrons, their response to neutrons being enhanced by 6Li-enriched lithium or suppressed by using lithium consisting entirely of 7Li. Pairs of 6LiF/7LiF detectors allow distinguishing between neutron/non-neutron components of a radiation field. For detection of neutrons of higher energy, polyethylene (PE-300) moderators were used. TLDs, located in the centre of cylindrical moderators, were installed at eleven positions in the JET hall and the hall labyrinth in July 2012, and exposure took place during the last two weeks of the experimental campaign. Measurements of the gamma dose were obtained for all positions over a range of about five orders of magnitude variation. As the TLDs were also calibrated in a thermal neutron field, the neutron fluence at the experimental position could be derived. The experimental results are compared with calculations using the MCNP code. The results confirm that the TLD technology can be usefully applied to measurements of neutron streaming through JET Torus Hall ducts.
[ { "created": "Thu, 30 Jan 2014 06:59:21 GMT", "version": "v1" } ]
2014-01-31
[ [ "Obryk", "Barbara", "" ], [ "Batistoni", "Paola", "" ], [ "Conroy", "Sean", "" ], [ "Syme", "Brian D.", "" ], [ "Popovichev", "Sergey", "" ], [ "Stamatelatos", "Ion E.", "" ], [ "Vasilopoulou", "Theodora", "" ], [ "Bilski", "Paweł", "" ], [ "Contributors", "JET EFDA", "" ] ]
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1401.7758
J\"urgen M\"unch
Frank Elberzhager, Stephan Kremer, J\"urgen M\"unch, Danilo Assmann
Focusing Testing by Using Inspection and Product Metrics
29 pages. The final publication is available at http://www.worldscientific.com/doi/abs/10.1142/s0218194013400093. arXiv admin note: substantial text overlap with arXiv:1312.0713
International Journal of Software Engineering and Knowledge Engineering, 23(04):433-462, 2013
10.1142/S0218194013400093
null
cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A well-known approach for identifying defect-prone parts of software in order to focus testing is to use different kinds of product metrics such as size or complexity. Although this approach has been evaluated in many contexts, the question remains if there are further opportunities to improve test focusing. One idea is to identify other types of information that may indicate the location of defect-prone software parts. Data from software inspections, in particular, appear to be promising. This kind of data might already lead to software parts that have inherent difficulties or programming challenges, and in consequence might be defect-prone. This article first explains how inspection and product metrics can be used to focus testing activities. Second, we compare selected product and inspection metrics commonly used to predict defect-prone parts (e.g., size and complexity metrics, inspection defect content metrics, and defect density metrics). Based on initial experience from two case studies performed in different environments, the suitability of different metrics for predicting defect-prone parts is illustrated. The studies revealed that inspection defect data seems to be a suitable predictor, and a combination of certain inspection and product metrics led to the best prioritizations in our contexts. In addition, qualitative experience is presented, which substantiates the expected benefit of using inspection results to optimize testing.
[ { "created": "Thu, 30 Jan 2014 07:49:10 GMT", "version": "v1" }, { "created": "Tue, 4 Feb 2014 07:45:41 GMT", "version": "v2" } ]
2014-02-05
[ [ "Elberzhager", "Frank", "" ], [ "Kremer", "Stephan", "" ], [ "Münch", "Jürgen", "" ], [ "Assmann", "Danilo", "" ] ]
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1401.7765
Goulc'hen Loas
Goulc'hen Loas, Mehdi Alouini, and Marc Vallet
Optical fiber Sagnac interferometer for sensing scalar directional refraction: application to magnetochiral birefringence
17 pages, 8 figures
null
10.1063/1.4871988
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a set-up dedicated to the measurement of the small scalar directional anisotropies associated to the magnetochiral interaction. The apparatus, based on a polarization-independent fiber Sagnac interferometer, is optimized to be insensitive to circular anisotropies and to residual absorption. It can thus characterize samples of biological interests, for which the two enantiomers are not available and/or which present poor transmission. The signal-to-noise ratio is shown to be limited only by the source intensity noise, leading to a detection limit of Df = 500 nrad.Hz-1/2. It yields a limit on the magnetochiral index nMC < 4 10-13 T-1 at 1550 nm for the organic molecules tested.
[ { "created": "Thu, 30 Jan 2014 08:59:09 GMT", "version": "v1" } ]
2015-06-18
[ [ "Loas", "Goulc'hen", "" ], [ "Alouini", "Mehdi", "" ], [ "Vallet", "Marc", "" ] ]
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1401.7772
Ahmed Alaa
Ahmed M. Alaa, Mahmoud H. Ismail and Hazim Tawfik
Spectrum Sensing Via Reconfigurable Antennas: Is Cooperation of Secondary Users Indispensable?
Accepted for IEEE WCNC 2014
null
10.1109/WCNC.2014.6952239
null
cs.NI cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This work presents an analytical framework for characterizing the performance of cooperative and noncooperative spectrum sensing schemes by figuring out the tradeoff between the achieved diversity and coding gains in each scheme. Based on this analysis, we try to answer the fundamental question: can we dispense with SUs cooperation and still achieve an arbitrary diversity gain? It is shown that this is indeed possible via a novel technique that can offer diversity gain for a single SU using a single antenna. The technique is based on the usage of a reconfigurable antenna that changes its propagation characteristics over time, thus creating an artificial temporal diversity. It is shown that the usage of reconfigurable antennas outperforms cooperative as well as non-cooperative schemes at low and high Signal-to-Noise Ratios (SNRs). Moreover, if the channel state information is available at the SU, an additional SNR gain can also be achieved.
[ { "created": "Thu, 30 Jan 2014 09:18:40 GMT", "version": "v1" } ]
2016-11-15
[ [ "Alaa", "Ahmed M.", "" ], [ "Ismail", "Mahmoud H.", "" ], [ "Tawfik", "Hazim", "" ] ]
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1401.7774
Michael Motsch
Michael Motsch, Paul Jansen, Josef A. Agner, Hansj\"urg Schmutz, Fr\'ed\'eric Merkt
Slow and velocity-tunable beams of metastable He$_2$ by multistage Zeeman deceleration
10 pages, 7 figures
Phys. Rev. A 89, 043420 (2014)
10.1103/PhysRevA.89.043420
null
physics.chem-ph physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Metastable helium molecules (He$_2^*$) have been generated by striking a discharge in a supersonic expansion of helium gas from a pulsed valve. When operating the pulsed valve at room temperature, 77K, and 10K, the mean velocity of the supersonic beam was measured to be 1900m/s, 980m/s, and 530m/s, respectively. A 55-stage Zeeman decelerator operated in a phase-stable manner was then used to further reduce the beam velocity and tune it in the range between 100 and 150m/s. The internal-state distribution of the decelerated sample was established by photoionization spectroscopy.
[ { "created": "Thu, 30 Jan 2014 09:30:26 GMT", "version": "v1" } ]
2014-04-24
[ [ "Motsch", "Michael", "" ], [ "Jansen", "Paul", "" ], [ "Agner", "Josef A.", "" ], [ "Schmutz", "Hansjürg", "" ], [ "Merkt", "Frédéric", "" ] ]
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1401.7776
Takuma Akimoto
Eiji Yamamoto, Takuma Akimoto, Masato Yasui, Kenji Yasuoka
Origin of subdiffusion of water molecules on cell membrane surfaces
6 pages, 4 figures
Sci. Rep. 4, 4720 (2014)
10.1038/srep04720
null
physics.bio-ph cond-mat.stat-mech physics.comp-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Water molecules play an important role in providing unique environments for biological reactions on cell membranes. It is widely believed that water molecules form bridges that connect lipid molecules and stabilize cell membranes. Using all-atom molecular dynamics simulations, we show that translational and rotational diffusion of water molecules on lipid membrane surfaces exhibit subdiffusion. Moreover, we provide evidence that both divergent mean trapping time (continuous-time random walk) and long-correlated noise (fractional Brownian motion) contribute to this subdiffusion. These results suggest that subdiffusion on cell membranes causes the water retardation, an enhancement of cell membrane stability, and a higher reaction efficiency.
[ { "created": "Thu, 30 Jan 2014 09:38:20 GMT", "version": "v1" } ]
2014-08-04
[ [ "Yamamoto", "Eiji", "" ], [ "Akimoto", "Takuma", "" ], [ "Yasui", "Masato", "" ], [ "Yasuoka", "Kenji", "" ] ]
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1401.7778
null
R McAdams
Control and calculation of the titanium sublimation pumping speed and re-ionisation in the MAST Neutral Beam Injectors
24 pages, 13 figures
Fusion Engineering and Design, Vol.90, January 2015, pp.47-54
10.1016/j.fusengdes.2014.11.006
null
physics.acc-ph physics.ins-det
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A high pumping speed is required in neutral beam injectors to minimise re-ionisation of the neutral beams. The neutral beam injectors on MAST use titanium sublimation pumps. These pumps do not have a constant pumping speed; their pumping speed depends on the gettering surface history and on both the integrated and applied gas load. In this paper we report a method of maintaining a constant pumping speed,through different evaporation schemes, suitable for operations of the MAST beamline for both short and relatively long beam pulses by measurement of the pressure in the beamline. In addition the MCNP code is then used to calculate the gas profile in the beamline by adjusting the input pumping speed to match the measured pressure. This allows the resulting gas profile to be used for calculation of the re-ionisation levels and an example is given.
[ { "created": "Thu, 30 Jan 2014 09:44:35 GMT", "version": "v1" } ]
2015-10-29
[ [ "McAdams", "R", "" ] ]
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1401.7796
Jarah Evslin
Marco Grassi, Jarah Evslin, Emilio Ciuffoli, Xinmin Zhang
Showering Cosmogenic Muons in A Large Liquid Scintillator
24 pages, 18 figures, v4: Improved precision of bundle rates
JHEP 1409 (2014) 049
10.1007/JHEP09(2014)049
null
physics.ins-det hep-ex hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present the results of FLUKA simulations of the propagation of cosmogenic muons in a 20 kton spherical liquid scintillator detector underneath 700 to 900 meters of rock. A showering muon is one which deposits at least 3 GeV in the detector in addition to ionization energy. We find that 20 percent of muons are showering and a further 10 percent of muon events are muon bundles of which more than one muon enters the detector. In this range the showering and bundle fractions are robust against changes in the depth and topography, thus the total shower and bundle rate for a given experiment can be obtained by combining our results with an estimate for the total muon flux. One consequence is that a straightforward adaptation of the full detector showering muon cuts used by KamLAND to JUNO or RENO 50 would yield a nearly vanishing detector efficiency.
[ { "created": "Thu, 30 Jan 2014 11:09:57 GMT", "version": "v1" }, { "created": "Mon, 24 Feb 2014 15:42:24 GMT", "version": "v2" }, { "created": "Sat, 19 Jul 2014 05:32:33 GMT", "version": "v3" }, { "created": "Mon, 15 Sep 2014 10:20:16 GMT", "version": "v4" } ]
2015-11-05
[ [ "Grassi", "Marco", "" ], [ "Evslin", "Jarah", "" ], [ "Ciuffoli", "Emilio", "" ], [ "Zhang", "Xinmin", "" ] ]
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1401.7798
Lorenzo Pareschi
Giacomo Albi, Michael Herty, Lorenzo Pareschi
Kinetic description of optimal control problems and applications to opinion consensus
25 pages, 18 figures
null
null
null
math.OC nlin.AO physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper an optimal control problem for a large system of interacting agents is considered using a kinetic perspective. As a prototype model we analyze a microscopic model of opinion formation under constraints. For this problem a Boltzmann-type equation based on a model predictive control formulation is introduced and discussed. In particular, the receding horizon strategy permits to embed the minimization of suitable cost functional into binary particle interactions. The corresponding Fokker-Planck asymptotic limit is also derived and explicit expressions of stationary solutions are given. Several numerical results showing the robustness of the present approach are finally reported.
[ { "created": "Thu, 30 Jan 2014 11:14:28 GMT", "version": "v1" } ]
2014-01-31
[ [ "Albi", "Giacomo", "" ], [ "Herty", "Michael", "" ], [ "Pareschi", "Lorenzo", "" ] ]
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1401.7799
Ted Hawkins
Ted Hawkins, Andrew Lemon, Alec Gibson
Introducing Morphit, a new type of spreadsheet technology
6 Pages, 4 colour figures, Proc. European Spreadsheet Risks Int. Grp. (EuSpRIG) 2013, ISBN: 978-1-9054045-1-3
null
null
null
cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper describes a new type of spreadsheet which mitigates the errors caused by incorrect range referencing in formulae. This spreadsheet is composed of structured worksheets called tables which contain a hierarchical organization of fields. Formulae are defined at the field-level removing the need for positional references. In addition, relationships can be defined between fields in tables, allowing data to be modeled rather than simply processed and providing a re-usable framework for authoring spreadsheets. We shall describe the key features of tables with an emphasis on error detection and avoidance.
[ { "created": "Thu, 30 Jan 2014 11:20:12 GMT", "version": "v1" } ]
2014-01-31
[ [ "Hawkins", "Ted", "" ], [ "Lemon", "Andrew", "" ], [ "Gibson", "Alec", "" ] ]
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1401.7807
Andrew Pitts
Andrew M. Pitts
An Equivalent Presentation of the Bezem-Coquand-Huber Category of Cubical Sets
10 pages
null
null
null
cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Staton has shown that there is an equivalence between the category of presheaves on (the opposite of) finite sets and partial bijections and the category of nominal restriction sets: see [2, Exercise 9.7]. The aim here is to see that this extends to an equivalence between the category of cubical sets introduced in [1] and a category of nominal sets equipped with a "01-substitution" operation. It seems to me that presenting the topos in question equivalently as 01-substitution sets rather than cubical sets will make it easier (and more elegant) to carry out the constructions and calculations needed to build the intended univalent model of intentional constructive type theory.
[ { "created": "Thu, 30 Jan 2014 11:47:48 GMT", "version": "v1" } ]
2014-01-31
[ [ "Pitts", "Andrew M.", "" ] ]
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An Equivalent Presentation of the Bezem-Coquand-Huber Category of Cubical Sets
http://arxiv.org/abs/1401.7807v1
http://arxiv.org/pdf/1401.7807v1.pdf
https://github.com/mortberg/cubicaltt
false
false
https://paperswithcode.com/paper/an-equivalent-presentation-of-the-bezem
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1401.7814
Henk Vlootman
Henk Vlootman, Felienne Hermans
A Maintainability Checklist for Spreadsheets
10 pages, 2 tables, 1 colour figure, Proc. European Spreadsheet Risks Int. Grp. (EuSpRIG) 2013, ISBN: 978-1-9054045-1-3
null
null
null
cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Spreadsheets are widely used in industry, because they are flexible and easy to use. Often, they are even used for business-critical applications. It is however difficult for spreadsheet users to correctly assess the maintainability of spreadsheets. Maintainability of spreadsheets is important, since spreadsheets often have a long lifespan, during which they are used by several users. In this paper, we present a checklist aimed at measuring the maintainability of a spreadsheet. This is achieved via asking several questions, and can indicate whether the spreadsheet is safe to use now and in the future. We demonstrate the applicability of our approach on 11 spreadsheets from the EUSES corpus.
[ { "created": "Thu, 30 Jan 2014 11:57:57 GMT", "version": "v1" } ]
2014-01-31
[ [ "Vlootman", "Henk", "" ], [ "Hermans", "Felienne", "" ] ]
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1401.7815
Vyacheslav Sokolov
V. G. Plotnichenko, D. V. Philippovskiy, V. O. Sokolov, M. V. Sukhanov, A. P. Velmuzhov, M. F. Churbanov, and E. M. Dianov
Infrared luminescence in Bi-doped Ge-S and As-Ge-S chalcogenide glasses and fibers
7 pages, 4 figures
Optical Materials Express, 4 366 (2014)
10.1364/OME.4.000366
null
cond-mat.mtrl-sci physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Experimental and theoretical studies of spectral properties of chalcogenide Ge-S and As-Ge-S glasses and fibers are performed. A broad infrared (IR) luminescence band which covers the 1.2-2.3~$\mu$m range with a lifetime about 6~$\mu$s is discovered. Similar luminescence is also present in optical fibers drawn from these glasses. Arsenic addition to Ge-S glass significantly enhances both its resistance to crystallization and the intensity of the luminescence. Computer modeling of Bi-related centers shows that interstitial Bi$^+$ ions adjacent to negatively charged S vacancies are most likely responsible for the IR luminescence.
[ { "created": "Thu, 30 Jan 2014 12:06:19 GMT", "version": "v1" } ]
2014-01-31
[ [ "Plotnichenko", "V. G.", "" ], [ "Philippovskiy", "D. V.", "" ], [ "Sokolov", "V. O.", "" ], [ "Sukhanov", "M. V.", "" ], [ "Velmuzhov", "A. P.", "" ], [ "Churbanov", "M. F.", "" ], [ "Dianov", "E. M.", "" ] ]
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1401.7816
Navid Constantinou
Navid C. Constantinou, Adrian Lozano-Dur\'an, Marios-Andreas Nikolaidis, Brian F. Farrell, Petros J. Ioannou and Javier Jim\'enez
Turbulence in the highly restricted dynamics of a closure at second order: comparison with DNS
18 pages, 14 figures
J. Phys.: Conf. Ser., 2014, 506, 012004
10.1088/1742-6596/506/1/012004
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
S3T (Stochastic Structural Stability Theory) employs a closure at second order to obtain the dynamics of the statistical mean turbulent state. When S3T is implemented as a coupled set of equations for the streamwise mean and perturbation states, nonlinearity in the dynamics is restricted to interaction between the mean and perturbations. The S3T statistical mean state dynamics can be approximately implemented by similarly restricting the dynamics used in a direct numerical simulation (DNS) of the full Navier-Stokes equations (referred to as the NS system). Although this restricted nonlinear system (referred to as the RNL system) is greatly simplified in its dynamics in comparison to the associated NS, it nevertheless self-sustains a turbulent state in wall-bounded shear flow with structures and dynamics comparable to that in observed turbulence. Moreover, RNL turbulence can be analyzed effectively using theoretical methods developed to study the closely related S3T system. In order to better understand RNL turbulence and its relation to NS turbulence, an extensive comparison is made of diagnostics of structure and dynamics in these systems. Although quantitative differences are found, the results show that turbulence in the RNL system closely parallels that in NS and suggest that the S3T/RNL system provides a promising reduced complexity model for studying turbulence in wall-bounded shear flows.
[ { "created": "Thu, 30 Jan 2014 12:10:58 GMT", "version": "v1" } ]
2014-04-17
[ [ "Constantinou", "Navid C.", "" ], [ "Lozano-Durán", "Adrian", "" ], [ "Nikolaidis", "Marios-Andreas", "" ], [ "Farrell", "Brian F.", "" ], [ "Ioannou", "Petros J.", "" ], [ "Jiménez", "Javier", "" ] ]
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1401.7821
Stephen Allen
Stephen Allen
Spatial Modelling Techniques in Microsoft Excel
9 pages, 5 colour figures, 1 table, Proc. European Spreadsheet Risks Int. Grp. (EuSpRIG) 2013, ISBN: 978-1-9054045-1-3
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cs.HC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We begin by considering the expectations of the creators of VisiCalc, the first spreadsheet. The emphasis is on the nature of the spreadsheet grid. The grid is taken as a presentational method for showing a solution to a Sudoku puzzle. We consider methods or approaches for the solution. We look at the relationship between this model and academic papers on the methods for describing and categorising end-user models generally. We consider whether the type of model described here should be categorised separately. The complexity of the model is reviewed in the context of commendations to minimise overly sophisticated presentational constructs and formulae.
[ { "created": "Thu, 30 Jan 2014 12:29:46 GMT", "version": "v1" } ]
2014-01-31
[ [ "Allen", "Stephen", "" ] ]
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1401.7822
Francesc Malet Giralt
Francesc Malet, Andre Mirtschink, Klaas J. H. Giesbertz, Lucas O. Wagner, and Paola Gori-Giorgi
Exchange-correlation functionals from the strongly-interacting limit of DFT: Applications to model chemical systems
9 pages, 6 figures. Submitted to PCCP's Themed Collection on Density Functional Theory and its Applications
Phys. Chem. Chem. Phys., 2014, 16 (28), 14551 - 14558
10.1039/C4CP00407H
null
physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study model one-dimensional chemical systems (representative of their three-dimensional counterparts) using the strictly-correlated electrons (SCE) functional, which, by construction, becomes asymptotically exact in the limit of infinite coupling strength. The SCE functional has a highly non-local dependence on the density and is able to capture strong correlation within Kohn- Sham theory without introducing any symmetry breaking. Chemical systems, however, are not close enough to the strong-interaction limit so that, while ionization energies and the stretched H2 molecule are accurately described, total energies are in general way too low. A correction based on the exact next leading order in the expansion at infinite coupling strength of the Hohenberg-Kohn functional largely improves the results.
[ { "created": "Thu, 30 Jan 2014 12:29:46 GMT", "version": "v1" } ]
2017-09-13
[ [ "Malet", "Francesc", "" ], [ "Mirtschink", "Andre", "" ], [ "Giesbertz", "Klaas J. H.", "" ], [ "Wagner", "Lucas O.", "" ], [ "Gori-Giorgi", "Paola", "" ] ]
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1401.7826
Ali Mansouri mr
Ali Mansouri and Mohamed Salim bouhlel
The result for the grundy number on p4 classes
5 pages
International Journal of Next-Generation Networks (IJNGN) Vol.5, No.4, December 2013
null
null
cs.DM math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Our work becomes integrated into the general problem of the stability of the network ad hoc. Some, works attacked (affected) this problem. Among these works, we find the modelling of the network ad hoc in the form of a graph. We can resume the problem of coherence of the network ad hoc of a problem of allocation of frequency We study a new class of graphs, the fat-extended P4 graphs, and we give a polynomial time algorithm to calculate the Grundy number of the graphs in this class. This result implies that the Grundy number can be found in polynomial time for many graphs
[ { "created": "Thu, 30 Jan 2014 12:35:32 GMT", "version": "v1" } ]
2014-06-06
[ [ "Mansouri", "Ali", "" ], [ "bouhlel", "Mohamed Salim", "" ] ]
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1401.7828
Cristina Flaut
Cristina Flaut
Codes over a subset of Octonion Integers
null
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we define codes over some Octonion integers. We prove that in some conditions these codes can correct up to two errors for a transmitted vector and the code rate of the codes is grater than the code rate of the codes defined on some subset of Quaternion integers.
[ { "created": "Thu, 30 Jan 2014 12:38:13 GMT", "version": "v1" } ]
2014-01-31
[ [ "Flaut", "Cristina", "" ] ]
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1401.7831
Garreth Ruane
Garreth J. Ruane, Prachyathit Kanburapa, Jiaxuan Han, and Grover A. Swartzlander Jr
Vortex-phase filtering technique for extracting spatial information from unresolved sources
7 pages, 8 figures
Appl. Opt. 53, 4503-4508 (2014)
10.1364/AO.53.004503
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A white light vortex coronagraph was used to experimentally achieve sub-resolution detection. The angular location of the centroid, $\gamma$, and the angular extent of circular pinhole sources, $\Theta$, were measured to within errors of $\delta\gamma = \pm0.015\,\lambda/D$ and $\delta\Theta = \pm0.026\,\lambda/D$. This technique has two advantages over conventional imaging: simple power measurements are made and shorter exposure times may be required to achieve a sufficient signal-to-noise ratio.
[ { "created": "Thu, 30 Jan 2014 12:52:19 GMT", "version": "v1" }, { "created": "Wed, 19 Mar 2014 14:30:40 GMT", "version": "v2" }, { "created": "Sat, 31 May 2014 20:43:31 GMT", "version": "v3" }, { "created": "Tue, 15 Jul 2014 01:23:10 GMT", "version": "v4" } ]
2014-07-16
[ [ "Ruane", "Garreth J.", "" ], [ "Kanburapa", "Prachyathit", "" ], [ "Han", "Jiaxuan", "" ], [ "Swartzlander", "Grover A.", "Jr" ] ]
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1401.7837
Andrea Andrisani
Antonio Dumas, Andrea Andrisani, Maurizio Bonnici, Mauro Madonia, Michele Trancossi
A new correlation between solar energy radiation and some atmospheric parameters
23 pages, 3 figures, 4 tables
null
null
null
physics.ao-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The energy balance for an atmospheric layer near the soil is evaluated. By integrating it over the whole day period a linear relationship between the global daily solar radiation incident on a horizontal surface and the product of the sunshine hours at clear sky with the maximum temperature variation in the day is achieved. The results show a comparable accuracy with some well recognized solar energy models such as the \ang-Prescott one, at least for Mediterranean climatic area. Validation of the result has been performed using old dataset which are almost contemporary and relative to the same sites with the ones used for comparison.
[ { "created": "Thu, 30 Jan 2014 13:27:50 GMT", "version": "v1" } ]
2014-01-31
[ [ "Dumas", "Antonio", "" ], [ "Andrisani", "Andrea", "" ], [ "Bonnici", "Maurizio", "" ], [ "Madonia", "Mauro", "" ], [ "Trancossi", "Michele", "" ] ]
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1401.7838
Isabella von Sivers
Isabella von Sivers and Gerta K\"oster
Dynamic Stride Length Adaptation According to Utility And Personal Space
Authors version, 30 Pages, accepted for publication in Transportation Research Part B: Methodological. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document
Transportation Research Part B: Methodological, 2015, Vol. 74, pages 104 - 117
10.1016/j.trb.2015.01.009
null
physics.soc-ph cs.MA math.OC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Pedestrians adjust both speed and stride length when they navigate difficult situations such as tight corners or dense crowds. They try to avoid collisions and to preserve their personal space. State-of-the-art pedestrian motion models automatically reduce speed in dense crowds simply because there is no space where the pedestrians could go. The stride length and its correct adaptation, however, are rarely considered. This leads to artefacts that impact macroscopic observation parameters such as densities in front of bottlenecks and, through this, flow. Hence modelling stride adaptation is important to increase the predictive power of pedestrian models. To achieve this we reformulate the problem as an optimisation problem on a disk around the pedestrian. Each pedestrian seeks the position that is most attractive in a sense of balanced goals between the search for targets, the need for individual space and the need to keep a distance from obstacles. The need for space is modelled according to findings from psychology defining zones around a person that, when invaded, cause unease. The result is a fully automatic adjustment that allows calibration through meaningful social parameters and that gives visually natural results with an excellent fit to measured experimental data.
[ { "created": "Thu, 30 Jan 2014 13:32:16 GMT", "version": "v1" }, { "created": "Fri, 17 Oct 2014 14:28:48 GMT", "version": "v2" }, { "created": "Mon, 2 Mar 2015 13:43:11 GMT", "version": "v3" } ]
2015-03-03
[ [ "von Sivers", "Isabella", "" ], [ "Köster", "Gerta", "" ] ]
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1401.7842
J\'er\^ome Bonelle
Jerome Bonelle and Alexandre Ern
Analysis of Compatible Discrete Operator Schemes for the Stokes Equations on Polyhedral Meshes
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math.NA cs.CE cs.NA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Compatible Discrete Operator schemes preserve basic properties of the continuous model at the discrete level. They combine discrete differential operators that discretize exactly topological laws and discrete Hodge operators that approximate constitutive relations. We devise and analyze two families of such schemes for the Stokes equations in curl formulation, with the pressure degrees of freedom located at either mesh vertices or cells. The schemes ensure local mass and momentum conservation. We prove discrete stability by establishing novel discrete Poincar\'e inequalities. Using commutators related to the consistency error, we derive error estimates with first-order convergence rates for smooth solutions. We analyze two strategies for discretizing the external load, so as to deliver tight error estimates when the external load has a large irrotational or divergence-free part. Finally, numerical results are presented on three-dimensional polyhedral meshes.
[ { "created": "Thu, 30 Jan 2014 13:43:11 GMT", "version": "v1" } ]
2014-01-31
[ [ "Bonelle", "Jerome", "" ], [ "Ern", "Alexandre", "" ] ]
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1401.7846
Georgios Ropokis
George A. Ropokis, David Gesbert, Kostas Berberidis
Optimal power control in Cognitive MIMO systems with limited feedback
null
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, the problem of optimal power allocation in Cognitive Radio (CR) Multiple Input Multiple Output (MIMO) systems is treated. The focus is on providing limited feedback solutions aiming at maximizing the secondary system rate subject to a constraint on the average interference caused to primary communication. The limited feedback solutions are obtained by reducing the information available at secondary transmitter (STx) for the link between STx and the secondary receiver (SRx) as well as by limiting the level of available information at STx that corresponds to the link between the STx and the primary receiver PRx. Monte Carlo simulation results are given that allow to quanitfy the performance achieved by the proposed algorithms.
[ { "created": "Thu, 30 Jan 2014 14:11:09 GMT", "version": "v1" } ]
2014-01-31
[ [ "Ropokis", "George A.", "" ], [ "Gesbert", "David", "" ], [ "Berberidis", "Kostas", "" ] ]
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1401.7860
Gayane Panina Mrs
Gaiane Panina, Dirk Siersma
Motion planning and control of a planar polygonal linkage
to appear in J. Symb. Comp
Journal of Synbolic Computation 88 (2018) 5-20
10.1016/j.jsc.2018.02.002
null
math.MG cs.RO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
For a polygonal linkage, we produce a fast navigation algorithm on its configuration space. The basic idea is to approximate the configuration space by the vertex-edge graph of its cell decomposition discovered by the first author. The algorithm has three aspects: (1) the number of navigation steps does not exceed 15 (independent of the linkage), (2) each step is a disguised flex of a quadrilateral from one triangular configuration to another, which is a well understood type of flex, and (3) each step can be performed explicitly by adding some extra bars and obtaining a mechanism with one degree of freedom.
[ { "created": "Thu, 30 Jan 2014 14:35:43 GMT", "version": "v1" }, { "created": "Sun, 13 Mar 2016 13:24:14 GMT", "version": "v2" } ]
2018-04-05
[ [ "Panina", "Gaiane", "" ], [ "Siersma", "Dirk", "" ] ]
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1401.7872
Ismael Rafols
Ismael Rafols, Harry K. MacWilliams, Yasuo Maeda and Yasuji Sawada
On the conflict between precision and robustness in the proportion regulation of cell types
This was a pre-print of January 2001 that was never published. The study was part of the PhD thesis of Ismael Rafols
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physics.bio-ph q-bio.CB
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In Dictyostelium discoideum the proportion of cell types is known to be actively regulated, recovering, for example, after the removal of a given cell type. However, we have recently shown that regulation is intrinsically imprecise: it controls the proportion above/below certain upper and lower thresholds, but not within an allowed range of values that these thresholds define. To explain this finding we present a model based on (i) a global negative feedback, and (ii) a cell-autonomous positive feedback leading to a hysteresis-like behaviour (i.e, a bistability of cell type). The simulated cell-type proportion is indeed found to span a range of values as a consequence of the bistability. We conclude that there is a general conflict between the precision of proportion regulation and the robustness of the differentiation of cell types.
[ { "created": "Thu, 30 Jan 2014 15:02:42 GMT", "version": "v1" } ]
2014-01-31
[ [ "Rafols", "Ismael", "" ], [ "MacWilliams", "Harry K.", "" ], [ "Maeda", "Yasuo", "" ], [ "Sawada", "Yasuji", "" ] ]
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1401.7874
Stuart Mangles
S. M. Hooker, R. Bartolini, S. P. D. Mangles, A. T\"unnermann, L. Corner, J. Limpert, A. Seryi, R. Walczak
Multi-Pulse Laser Wakefield Acceleration: A New Route to Efficient, High-Repetition-Rate Plasma Accelerators and High Flux Radiation Sources
null
null
10.1088/0953-4075/47/23/234003
null
physics.acc-ph physics.plasm-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Laser-driven plasma accelerators can generate accelerating gradients three orders of magnitude larger than radio-frequency accelerators and have achieved beam energies above 1 GeV in centimetre long stages. However, the pulse repetition rate and wall-plug efficiency of plasma accelerators is limited by the driving laser to less than approximately 1 Hz and 0.1% respectively. Here we investigate the prospects for exciting the plasma wave with trains of low-energy laser pulses rather than a single high-energy pulse. Resonantly exciting the wakefield in this way would enable the use of different technologies, such as fibre or thin-disc lasers, which are able to operate at multi-kilohertz pulse repetition rates and with wall-plug efficiencies two orders of magnitude higher than current laser systems. We outline the parameters of efficient, GeV-scale, 10-kHz plasma accelerators and show that they could drive compact X-ray sources with average photon fluxes comparable to those of third-generation light source but with significantly improved temporal resolution. Likewise FEL operation could be driven with comparable peak power but with significantly larger repetition rates than extant FELs.
[ { "created": "Thu, 30 Jan 2014 15:13:01 GMT", "version": "v1" } ]
2015-06-18
[ [ "Hooker", "S. M.", "" ], [ "Bartolini", "R.", "" ], [ "Mangles", "S. P. D.", "" ], [ "Tünnermann", "A.", "" ], [ "Corner", "L.", "" ], [ "Limpert", "J.", "" ], [ "Seryi", "A.", "" ], [ "Walczak", "R.", "" ] ]
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1401.7881
A. M. Fedotov
N.V. Elkina, A.M. Fedotov, C. Herzing, H. Ruhl
Accurate numerical simulation of radiation reaction effects in strong electromagnetic fields
16 pages, 13 figures
null
null
null
physics.plasm-ph physics.acc-ph physics.comp-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Landau-Lifshitz equation provides an efficient way to account for the effects of radiation reaction without acquiring the non-physical solutions typical for the Lorentz-Abraham-Dirac equation. We solve the Landau-Lifshitz equation in its covariant four-vector form in order to control both the energy and momentum of radiating particle. Our study reveals that implicit time-symmetric collocation methods of the Runge-Kutta-Nystr\"om type are superior in both accuracy and better maintaining the mass-shell condition than their explicit counterparts. We carry out an extensive study of numerical accuracy by comparing the analytical and numerical solutions of the Landau-Lifshitz equation. Finally, we present the results of simulation of particles scattering by a focused laser pulse. Due to radiation reaction, particles are less capable for penetration into the focal region, as compared to the case of radiation reaction neglected. Our results are important for designing the forthcoming experiments with high intensity laser fields.
[ { "created": "Thu, 30 Jan 2014 15:24:44 GMT", "version": "v1" } ]
2014-01-31
[ [ "Elkina", "N. V.", "" ], [ "Fedotov", "A. M.", "" ], [ "Herzing", "C.", "" ], [ "Ruhl", "H.", "" ] ]
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1401.7886
Arnaud Spiwack
Guyslain Naves and Arnaud Spiwack
Balancing lists: a proof pearl
To appear in proceedings of Interactive Theorem Proving (2014)
null
null
null
cs.DS cs.LO
http://creativecommons.org/licenses/by/3.0/
Starting with an algorithm to turn lists into full trees which uses non-obvious invariants and partial functions, we progressively encode the invariants in the types of the data, removing most of the burden of a correctness proof. The invariants are encoded using non-uniform inductive types which parallel numerical representations in a style advertised by Okasaki, and a small amount of dependent types.
[ { "created": "Thu, 30 Jan 2014 15:40:18 GMT", "version": "v1" }, { "created": "Fri, 13 Jun 2014 12:32:39 GMT", "version": "v2" } ]
2014-06-16
[ [ "Naves", "Guyslain", "" ], [ "Spiwack", "Arnaud", "" ] ]
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1401.7890
Xiangju Qin
Xiangju Qin, Michael Salter-Townshend, P\'adraig Cunningham
Exploring the Relationship between Membership Turnover and Productivity in Online Communities
null
null
null
null
cs.SI physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
One of the more disruptive reforms associated with the modern Internet is the emergence of online communities working together on knowledge artefacts such as Wikipedia and OpenStreetMap. Recently it has become clear that these initiatives are vulnerable because of problems with membership turnover. This study presents a longitudinal analysis of 891 WikiProjects where we model the impact of member turnover and social capital losses on project productivity. By examining social capital losses we attempt to provide a more nuanced analysis of member turnover. In this context social capital is modelled from a social network perspective where the loss of more central members has more impact. We find that only a small proportion of WikiProjects are in a relatively healthy state with low levels of membership turnover and social capital losses. The results show that the relationship between social capital losses and project performance is U-shaped, and that member withdrawal has significant negative effect on project outcomes. The results also support the mediation of turnover rate and network density on the curvilinear relationship.
[ { "created": "Thu, 30 Jan 2014 15:52:46 GMT", "version": "v1" } ]
2014-01-31
[ [ "Qin", "Xiangju", "" ], [ "Salter-Townshend", "Michael", "" ], [ "Cunningham", "Pádraig", "" ] ]
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1401.7892
Arash Mafi
Elham Nazemosadat and Arash Mafi
Nonlinear switching in a concentric ring core chalcogenide glass optical fiber for passively mode-locking a fiber laser
null
null
10.1364/OL.39.004675
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose an all-fiber mode-locking device which operates based on nonlinear switching in a novel concentric ring core fiber structure. The design is particularly attractive given the ease of fabrication and coupling to other components in a mode-locked fiber laser cavity. The nonlinear switching in this coupler is studied and the relative power transmission is obtained. The analysis shows that this nonlinear switch is practical for mode-locking fiber lasers and is forgiving to fabrication errors.
[ { "created": "Thu, 30 Jan 2014 15:54:01 GMT", "version": "v1" } ]
2015-06-05
[ [ "Nazemosadat", "Elham", "" ], [ "Mafi", "Arash", "" ] ]
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1401.7898
Aryeh Kontorovich
Aryeh Kontorovich and Roi Weiss
Maximum Margin Multiclass Nearest Neighbors
null
null
null
null
cs.LG math.ST stat.TH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We develop a general framework for margin-based multicategory classification in metric spaces. The basic work-horse is a margin-regularized version of the nearest-neighbor classifier. We prove generalization bounds that match the state of the art in sample size $n$ and significantly improve the dependence on the number of classes $k$. Our point of departure is a nearly Bayes-optimal finite-sample risk bound independent of $k$. Although $k$-free, this bound is unregularized and non-adaptive, which motivates our main result: Rademacher and scale-sensitive margin bounds with a logarithmic dependence on $k$. As the best previous risk estimates in this setting were of order $\sqrt k$, our bound is exponentially sharper. From the algorithmic standpoint, in doubling metric spaces our classifier may be trained on $n$ examples in $O(n^2\log n)$ time and evaluated on new points in $O(\log n)$ time.
[ { "created": "Thu, 30 Jan 2014 16:00:43 GMT", "version": "v1" } ]
2014-01-31
[ [ "Kontorovich", "Aryeh", "" ], [ "Weiss", "Roi", "" ] ]
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1401.7902
Gilles Gerbier
G. Gerbier, I. Giomataris, P. Magnier, A. Dastgheibi, M. Gros, D. Jourde, E. Bougamont, X.F. Navick, T. Papaevangelou, J. Galan, J. Derre, I. Savvidis, G. Tsiledakis
NEWS : a new spherical gas detector for very low mass WIMP detection
6 pages, 8 figures
null
null
null
astro-ph.IM hep-ex physics.ins-det
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The main characteristics of a new concept of spherical gaseous detectors, with some details on its operation are first given. The very low energy threshold of such detector has led to investigations of its potential performance for dark matter particle searches, in particular low mass WIMP's : original methods for energy and fiducial volume calibration and background rejection are described and preliminary results obtained with a low radioactivity prototype operated in Laboratoire Souterrain de Modane ("Frejus" lab) are presented. Typical expected sensitivities in cross section for low mass WIMP's are also shown, and other applications briefly discussed.
[ { "created": "Thu, 30 Jan 2014 16:09:58 GMT", "version": "v1" } ]
2014-01-31
[ [ "Gerbier", "G.", "" ], [ "Giomataris", "I.", "" ], [ "Magnier", "P.", "" ], [ "Dastgheibi", "A.", "" ], [ "Gros", "M.", "" ], [ "Jourde", "D.", "" ], [ "Bougamont", "E.", "" ], [ "Navick", "X. F.", "" ], [ "Papaevangelou", "T.", "" ], [ "Galan", "J.", "" ], [ "Derre", "J.", "" ], [ "Savvidis", "I.", "" ], [ "Tsiledakis", "G.", "" ] ]
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1401.7903
Amir H. Fatollahi
Marjan-S. Mirahmadi, Amir H. Fatollahi
Eigenvalue problem for radial potentials in space with SU(2) fuzziness
1+20 pages, 2 figs, LaTeX
null
10.1063/1.4892999
null
physics.gen-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The eigenvalue problem for radial potentials is considered in a space whose spatial coordinates satisfy the SU(2) Lie algebra. As the consequence, the space has a lattice nature and the maximum value of momentum is bounded from above. The model shows interesting features due to the bound, namely, a repulsive potential can develop bound-states, or an attractive region may be forbidden for particles to propagate with higher energies. The exact radial eigen-functions in momentum space are given by means of the associated Chebyshev functions. For the radial stepwise potentials the exact energy condition and the eigen-functions are presented. For a general radial potential it is shown that the discrete energy spectrum can be obtained in desired accuracy by means of given forms of continued fractions.
[ { "created": "Fri, 3 Jan 2014 07:37:46 GMT", "version": "v1" } ]
2015-06-18
[ [ "Mirahmadi", "Marjan-S.", "" ], [ "Fatollahi", "Amir H.", "" ] ]
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1401.7909
Fred Morstatter
Fred Morstatter, J\"urgen Pfeffer, Huan Liu
When is it Biased? Assessing the Representativeness of Twitter's Streaming API
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null
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cs.SI physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Twitter has captured the interest of the scientific community not only for its massive user base and content, but also for its openness in sharing its data. Twitter shares a free 1% sample of its tweets through the "Streaming API", a service that returns a sample of tweets according to a set of parameters set by the researcher. Recently, research has pointed to evidence of bias in the data returned through the Streaming API, raising concern in the integrity of this data service for use in research scenarios. While these results are important, the methodologies proposed in previous work rely on the restrictive and expensive Firehose to find the bias in the Streaming API data. In this work we tackle the problem of finding sample bias without the need for "gold standard" Firehose data. Namely, we focus on finding time periods in the Streaming API data where the trend of a hashtag is significantly different from its trend in the true activity on Twitter. We propose a solution that focuses on using an open data source to find bias in the Streaming API. Finally, we assess the utility of the data source in sparse data situations and for users issuing the same query from different regions.
[ { "created": "Thu, 30 Jan 2014 16:27:14 GMT", "version": "v1" } ]
2014-01-31
[ [ "Morstatter", "Fred", "" ], [ "Pfeffer", "Jürgen", "" ], [ "Liu", "Huan", "" ] ]
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1401.7918
Emilija Celakoska
Kostadin Tren\v{c}evski, Emilija Celakoska
Equations of motion for two-body problem according to an observer inside the gravitational field
null
JDSGT 9(2), 2011
10.1080/1726037X.2011.10698596
null
physics.gen-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we consider equations of motion for 2-body problem according to an observer close to one of the gravitational bodies. The influence of the Thomas precession of the observer's frame has an important role. The equations of motion are based on a nonlinear connection modified by the action of an orthogonal tensor which synchronizes the 4-velocities of the considered two bodies. Finally we present periastron shift according to an observer inside the gravitational field, using the orthonormal coordinates. This is different approach than that used in General Relativity where the periastron shift is only given as observed far from the massive bodies.
[ { "created": "Sat, 4 Jan 2014 17:51:43 GMT", "version": "v1" } ]
2014-01-31
[ [ "Trenčevski", "Kostadin", "" ], [ "Celakoska", "Emilija", "" ] ]
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1401.7921
Daniel R. Amor
Daniel R. Amor and Ricard V. Sol\'e
Catastrophic shifts and lethal thresholds in a propagating front model of unstable tumour progression
10 pages, 5 figures
null
10.1103/PhysRevE.90.022710
null
physics.bio-ph q-bio.CB q-bio.PE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Unstable dynamics characterizes the evolution of most solid tumors. Because of an increased failure of maintaining genome integrity, a cumulative increase in the levels of gene mutation and loss is observed. Previous work suggests that instability thresholds to cancer progression exist, defining phase transition phenomena separating tumor-winning scenarios from tumor extinction or coexistence phases. Here we present an integral equation approach to the quasispecies dynamics of unstable cancer. The model exhibits two main phases, characterized by either the success or failure of cancer tissue. Moreover, the model predicts that tumor failure can be due to either a reduced selective advantage over healthy cells or excessive instability. We also derive an approximate, analytical solution that predicts the front speed of aggressive tumor populations on the instability space.
[ { "created": "Thu, 30 Jan 2014 16:52:34 GMT", "version": "v1" }, { "created": "Tue, 15 Jul 2014 09:34:26 GMT", "version": "v2" } ]
2015-06-18
[ [ "Amor", "Daniel R.", "" ], [ "Solé", "Ricard V.", "" ] ]
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1401.7922
Domiziano Mostacci
Vincenzo Molinari, Domiziano Mostacci
Dispersion Relation of Longitudinal Waves in Liquid He-4 in the Framework of Quantum Macroscopic Equations derived from Bohm's Potential
17 pages 3 figures (embedded)
Physica A, 435 (2015) 28-35
10.1016/j.physa.2015.04.034
null
physics.gen-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
He-4 is known to become superfluid at very low temperatures. This effect is now generally accepted to be connected with BEC (Bose-Einstein Condensation). The dispersion relation of pressure waves in superfluid He-4 has been determined at 1.1 {\deg}K by Yarnell et al., and exhibits a non monotonic behavior - with a maximum and a minimum - usually explained in terms of excitations called rotons, introduced by Landau. In the present work an attempt is made to describe the phenomenon within the bohmian interpretation of QM. To this end, the effects of the intermolecular potential, taken to be essentially of the Lennard-Jones type modified to account for molecule finiteness, are included as a Vlasov-type self-consistent field. A dispersion relation is found, that is in quite good agreement with Yarnell's curve. Keywords: Bohm potential; Intermolecular potential; Dispersion relation; Superfluid He-4; First sound. PACS: 05.30.Jp; 05.20.Dd; 03.75.Kk; 67.25.dt
[ { "created": "Tue, 7 Jan 2014 15:47:18 GMT", "version": "v1" }, { "created": "Sun, 16 Mar 2014 13:02:33 GMT", "version": "v2" }, { "created": "Thu, 7 Aug 2014 16:17:26 GMT", "version": "v3" }, { "created": "Fri, 8 Aug 2014 12:47:34 GMT", "version": "v4" }, { "created": "Wed, 13 Aug 2014 18:22:48 GMT", "version": "v5" }, { "created": "Fri, 15 Aug 2014 08:45:38 GMT", "version": "v6" }, { "created": "Mon, 18 Aug 2014 11:29:55 GMT", "version": "v7" }, { "created": "Wed, 15 Apr 2015 20:04:01 GMT", "version": "v8" } ]
2015-05-25
[ [ "Molinari", "Vincenzo", "" ], [ "Mostacci", "Domiziano", "" ] ]
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1401.7923
Marc Lelarge
Marc Lelarge
Loopy annealing belief propagation for vertex cover and matching: convergence, LP relaxation, correctness and Bethe approximation
revised version, 23 pages
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null
null
cs.DM cs.DS cs.IT math-ph math.IT math.MP math.PR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
For the minimum cardinality vertex cover and maximum cardinality matching problems, the max-product form of belief propagation (BP) is known to perform poorly on general graphs. In this paper, we present an iterative loopy annealing BP (LABP) algorithm which is shown to converge and to solve a Linear Programming relaxation of the vertex cover or matching problem on general graphs. LABP finds (asymptotically) a minimum half-integral vertex cover (hence provides a 2-approximation) and a maximum fractional matching on any graph. We also show that LABP finds (asymptotically) a minimum size vertex cover for any bipartite graph and as a consequence compute the matching number of the graph. Our proof relies on some subtle monotonicity arguments for the local iteration. We also show that the Bethe free entropy is concave and that LABP maximizes it. Using loop calculus, we also give an exact (also intractable for general graphs) expression of the partition function for matching in term of the LABP messages which can be used to improve mean-field approximations.
[ { "created": "Thu, 30 Jan 2014 16:56:12 GMT", "version": "v1" }, { "created": "Mon, 7 Jul 2014 20:47:35 GMT", "version": "v2" } ]
2014-07-09
[ [ "Lelarge", "Marc", "" ] ]
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1401.7930
Eugene Loza
V.A. Kostygin, G.S. Stolyarenko, G.M. Kochetov, A.M. Tugay, V.N. Vashchenko
Water softening by single-bowl ion exchange filter efficiency estimate and improvement
14 pages, 5 figures
null
null
null
physics.chem-ph physics.ins-det
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The article presents results of experimental investigations of the water softener in a laboratory installation of uninterruptible countercurrent ion exchange filter, which has a movable layer of ion exchange material. The installation provides for two simultaneous processes: counter ion sorption and regeneration of the sorbent with the processing capability of the sorbent in the regeneration zone by ultrasonic radiation.
[ { "created": "Thu, 30 Jan 2014 17:29:00 GMT", "version": "v1" } ]
2014-01-31
[ [ "Kostygin", "V. A.", "" ], [ "Stolyarenko", "G. S.", "" ], [ "Kochetov", "G. M.", "" ], [ "Tugay", "A. M.", "" ], [ "Vashchenko", "V. N.", "" ] ]
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1401.7933
Andres Santos
Nagi Khalil, Vicente Garz\'o, and Andr\'es Santos
Hydrodynamic Burnett equations for inelastic Maxwell models of granular gases
16 pages, 5 figures; v2: new Appendix (D) and new references added
Phys. Rev. E 89, 052201 (2014)
10.1103/PhysRevE.89.052201
null
cond-mat.soft cond-mat.stat-mech physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The hydrodynamic Burnett equations and the associated transport coefficients are exactly evaluated for generalized inelastic Maxwell models. In those models, the one-particle distribution function obeys the inelastic Boltzmann equation, with a velocity-independent collision rate proportional to the $\gamma$ power of the temperature. The pressure tensor and the heat flux are obtained to second order in the spatial gradients of the hydrodynamic fields with explicit expressions for all the Burnett transport coefficients as functions of $\gamma$, the coefficient of normal restitution, and the dimensionality of the system. Some transport coefficients that are related in a simple way in the elastic limit become decoupled in the inelastic case. As a byproduct, existing results in the literature for three-dimensional elastic systems are recovered, and a generalization to any dimension of the system is given. The structure of the present results is used to estimate the Burnett coefficients for inelastic hard spheres.
[ { "created": "Thu, 30 Jan 2014 17:48:45 GMT", "version": "v1" }, { "created": "Tue, 6 May 2014 07:30:41 GMT", "version": "v2" } ]
2014-05-07
[ [ "Khalil", "Nagi", "" ], [ "Garzó", "Vicente", "" ], [ "Santos", "Andrés", "" ] ]
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1401.7941
Stefano Albrecht
Stefano V. Albrecht, Subramanian Ramamoorthy
Exploiting Causality for Selective Belief Filtering in Dynamic Bayesian Networks
44 pages; final manuscript published in Journal of Artificial Intelligence Research (JAIR)
null
10.1613/jair.5044
null
cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Dynamic Bayesian networks (DBNs) are a general model for stochastic processes with partially observed states. Belief filtering in DBNs is the task of inferring the belief state (i.e. the probability distribution over process states) based on incomplete and noisy observations. This can be a hard problem in complex processes with large state spaces. In this article, we explore the idea of accelerating the filtering task by automatically exploiting causality in the process. We consider a specific type of causal relation, called passivity, which pertains to how state variables cause changes in other variables. We present the Passivity-based Selective Belief Filtering (PSBF) method, which maintains a factored belief representation and exploits passivity to perform selective updates over the belief factors. PSBF produces exact belief states under certain assumptions and approximate belief states otherwise, where the approximation error is bounded by the degree of uncertainty in the process. We show empirically, in synthetic processes with varying sizes and degrees of passivity, that PSBF is faster than several alternative methods while achieving competitive accuracy. Furthermore, we demonstrate how passivity occurs naturally in a complex system such as a multi-robot warehouse, and how PSBF can exploit this to accelerate the filtering task.
[ { "created": "Thu, 30 Jan 2014 18:05:48 GMT", "version": "v1" }, { "created": "Wed, 9 Dec 2015 14:54:34 GMT", "version": "v2" }, { "created": "Mon, 25 Apr 2016 17:51:09 GMT", "version": "v3" } ]
2016-04-26
[ [ "Albrecht", "Stefano V.", "" ], [ "Ramamoorthy", "Subramanian", "" ] ]
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1401.7944
Fragkiskos Papadopoulos
Constantinos Psomas, Fragkiskos Papadopoulos
Performance Rescaling of Complex Networks
To appear in IEEE Communications Letters
IEEE Communications Letters, Vol. 18, Issue 4, pp. 684-687, 2014
10.1109/LCOMM.2014.021014.132684
null
cs.NI cond-mat.stat-mech cs.SI physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Recent progress in network topology modeling [1], [2] has shown that it is possible to create smaller-scale replicas of large complex networks, like the Internet, while simultaneously preserving several important topological properties. However, the constructed replicas do not include notions of capacities and latencies, and the fundamental question of whether smaller networks can reproduce the performance of larger networks remains unanswered. We address this question in this letter, and show that it is possible to predict the performance of larger networks from smaller replicas, as long as the right link capacities and propagation delays are assigned to the replica's links. Our procedure is inspired by techniques introduced in [2] and combines a time-downscaling argument from [3]. We show that significant computational savings can be achieved when simulating smaller-scale replicas with TCP and UDP traffic, with simulation times being reduced by up to two orders of magnitude.
[ { "created": "Thu, 30 Jan 2014 18:18:22 GMT", "version": "v1" } ]
2015-08-18
[ [ "Psomas", "Constantinos", "" ], [ "Papadopoulos", "Fragkiskos", "" ] ]
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1401.7949
Donatella Cassettari
Rowan W. G. Moore, Lucie A. Lee, Elizabeth A. Findlay, Lara Torralbo-Campo, Graham D. Bruce and Donatella Cassettari
Measurement of Vacuum Pressure with a Magneto-Optical Trap: a Pressure-Rise Method
5 pages, 6 figures
Rev. Sci. Instrum. 86, 093108 (2015)
10.1063/1.4928154
null
physics.atom-ph cond-mat.quant-gas physics.ins-det
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The lifetime of an atom trap is often limited by the presence of residual background gases in the vacuum chamber. This leads to the lifetime being inversely proportional to the pressure. Here we use this dependence to estimate the pressure and to obtain pressure rate-of-rise curves, which are commonly used in vacuum science to evaluate the performance of a system. We observe different rates of pressure increase in response to different levels of outgassing in our system. Therefore we suggest that this is a sensitive method which will be useful in applications of cold atom systems, in particular where the inclusion of a standard vacuum gauge is impractical.
[ { "created": "Thu, 30 Jan 2014 18:33:35 GMT", "version": "v1" }, { "created": "Thu, 29 Jan 2015 09:38:35 GMT", "version": "v2" } ]
2015-10-14
[ [ "Moore", "Rowan W. G.", "" ], [ "Lee", "Lucie A.", "" ], [ "Findlay", "Elizabeth A.", "" ], [ "Torralbo-Campo", "Lara", "" ], [ "Bruce", "Graham D.", "" ], [ "Cassettari", "Donatella", "" ] ]
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1401.7960
Jeremy Shears
Jeremy Shears, Carl Knight, Martin Lewis, Lee Macdonald, Stewart Moore, Jeff Young
In the footsteps of Ebenezer Porter Mason and his nebulae
13 pages, 7 Figures. Accepted for publication in the Journal of the British Astronomical Association
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physics.hist-ph astro-ph.IM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In 1839 Ebenezer Porter Mason (1819-1840) produced detailed drawings of the Omega Nebula (M17), the Trifid Nebula (M20) and the eastern part of the Veil Nebula (NGC 6992 and 6995). He used a 12-inch (30 cm) reflector that he and his friends had built at Yale College, which at the time was the largest telescope in the USA. The drawings were remarkable for their accuracy and for his adoption of a new technique for delineating gradients in nebulosity using isophotes, or lines of equal brightness. This paper reviews his life and his observations, comparing his results with those of the modern amateur astronomer.
[ { "created": "Thu, 30 Jan 2014 19:18:11 GMT", "version": "v1" } ]
2014-01-31
[ [ "Shears", "Jeremy", "" ], [ "Knight", "Carl", "" ], [ "Lewis", "Martin", "" ], [ "Macdonald", "Lee", "" ], [ "Moore", "Stewart", "" ], [ "Young", "Jeff", "" ] ]
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1401.7962
Cornelia Victoria Anghel Drugarin
Anghel Drugarin, Cornelia Victoria
Numerical application and Turbo C program using the Gauss-Jordan Method
in Romanian
Algebra liniara. Programare liniara, vol.1, Eftimie Murgu,Press Resita (2003). AGIR Press, vol.22, 2012, pp.171-176
null
null
cs.MS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The article presents the general notions and algorithm about the Gauss-Jordan method. An eloquent example is given and the Turbo C program illustrated this method. We conclude that we can obtain by this method the determinant, by simple calculations and reducing the rounding errors
[ { "created": "Wed, 29 Jan 2014 10:44:45 GMT", "version": "v1" } ]
2014-01-31
[ [ "Drugarin", "Anghel", "" ], [ "Victoria", "Cornelia", "" ] ]
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1401.7970
David Malec
Erik D. Demaine, MohammadTaghi Hajiaghayi, Hamid Mahini, David L. Malec, S. Raghavan, Anshul Sawant, Morteza Zadimoghadam
How to Influence People with Partial Incentives
null
null
null
null
cs.GT cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the power of fractional allocations of resources to maximize influence in a network. This work extends in a natural way the well-studied model by Kempe, Kleinberg, and Tardos (2003), where a designer selects a (small) seed set of nodes in a social network to influence directly, this influence cascades when other nodes reach certain thresholds of neighbor influence, and the goal is to maximize the final number of influenced nodes. Despite extensive study from both practical and theoretical viewpoints, this model limits the designer to a binary choice for each node, with no way to apply intermediate levels of influence. This model captures some settings precisely, e.g. exposure to an idea or pathogen, but it fails to capture very relevant concerns in others, for example, a manufacturer promoting a new product by distributing five "20% off" coupons instead of giving away one free product. While fractional versions of problems tend to be easier to solve than integral versions, for influence maximization, we show that the two versions have essentially the same computational complexity. On the other hand, the two versions can have vastly different solutions: the added flexibility of fractional allocation can lead to significantly improved influence. Our main theoretical contribution is to show how to adapt the major positive results from the integral case to the fractional case. Specifically, Mossel and Roch (2006) used the submodularity of influence to obtain their integral results; we introduce a new notion of continuous submodularity, and use this to obtain matching fractional results. We conclude that we can achieve the same greedy $(1-1/e-\epsilon)$-approximation for the fractional case as the integral case. In practice, we find that the fractional model performs substantially better than the integral model, according to simulations on real-world social network data.
[ { "created": "Thu, 30 Jan 2014 20:09:12 GMT", "version": "v1" } ]
2014-01-31
[ [ "Demaine", "Erik D.", "" ], [ "Hajiaghayi", "MohammadTaghi", "" ], [ "Mahini", "Hamid", "" ], [ "Malec", "David L.", "" ], [ "Raghavan", "S.", "" ], [ "Sawant", "Anshul", "" ], [ "Zadimoghadam", "Morteza", "" ] ]
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1401.7974
Bin Liu
Bin Liu and J. Goree
Mobility in a strongly coupled dusty plasma with gas
null
null
10.1103/PhysRevE.89.043107
null
physics.plasm-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The mobility of a charged projectile in a strongly coupled dusty plasma is simulated. A net force $F$, opposed by a combination of collisional scattering and gas friction, causes projectiles to drift at a mobility-limited velocity $u_p$. The mobility $\mu_p=u_p/F$ of the projectile's motion is obtained. Two regimes depending on $F$ are identified. In the high force regime, $\mu_p \propto F^{0.23}$, and the scattering cross section $\sigma_s$ diminishes as $u_p^{-6/5}$. Results for $\sigma_s$ are compared with those for a weakly coupled plasma and for two-body collisions in a Yukawa potential. The simulation parameters are based on microgravity plasma experiments.
[ { "created": "Thu, 30 Jan 2014 20:31:48 GMT", "version": "v1" } ]
2015-06-18
[ [ "Liu", "Bin", "" ], [ "Goree", "J.", "" ] ]
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1401.7976
Sebastien Bize
Jocelyne Gu\'ena, Michel Abgrall, Andr\'e Clairon and S\'ebastien Bize
Contributing to TAI with a Secondary Representation of the SI Second
13 pages, 10 figures, 3 tables, 80 references
Metrologia 51, 108 (2014)
10.1088/0026-1394/51/1/108
null
physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We report the first contribution to the international atomic time (TAI) based on a secondary representation of the SI second. This work is done with the LNE-SYRTE FO2-Rb fountain frequency standard using the $^{87}$Rb ground state hyperfine transition. We describe FO2-Rb and how it is connected to local and international time scales. We report on local measurements of this frequency standard in the SI system, i.e. against primary frequency standards, down to a fractional uncertainty of $4.4\times 10^{-16}$, and on the establishment of the recommended value for the $^{87}$Rb hyperfine transition by the CIPM. We also report on the process that led to the participation of the FO2-Rb frequency standard to $Circular~T$ and to the elaboration of TAI. This participation enables us to demonstrate absolute frequency measurement directly in terms of the SI second realized by the TAI ensemble with a statistical uncertainty of $1.1\times 10^{-16}$, therefore at the limit allowed by the accuracy of primary frequency standards. This work constitutes a demonstration of how other secondary representations, based on optical transitions, could also be used for TAI, and an investigation of a number of issues relevant to a future redefinition of the SI second.
[ { "created": "Wed, 29 Jan 2014 20:28:54 GMT", "version": "v1" } ]
2014-01-31
[ [ "Guéna", "Jocelyne", "" ], [ "Abgrall", "Michel", "" ], [ "Clairon", "André", "" ], [ "Bize", "Sébastien", "" ] ]
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1401.7985
Raymond Ang\'elil
Raymond Ang\'elil, J\"urg Diemand, Kyoko K. Tanaka, Hidekazu Tanaka
Properties of Liquid Clusters in Large-scale Molecular Dynamics Nucleation Simulations
16 pages, 19 figures, accepted for publication in J. Chem. Phys
J. Chem. Phys. 140, 074303 (2014)
10.1063/1.4865256
null
physics.chem-ph cond-mat.soft
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We have performed large-scale Lennard-Jones molecular dynamics simulations of homogeneous vapor-to-liquid nucleation, with $10^9$ atoms. This large number allows us to resolve extremely low nucleation rates, and also provides excellent statistics for cluster properties over a wide range of cluster sizes. The nucleation rates, cluster growth rates, and size distributions are presented in Diemand et al. [J. Chem. Phys. {\bf 139}, 74309 (2013)], while this paper analyses the properties of the clusters. We explore the cluster temperatures, density profiles, potential energies and shapes. A thorough understanding of the properties of the clusters is crucial to the formulation of nucleation models. Significant latent heat is retained by stable clusters, by as much as $\Delta kT = 0.1 \epsilon$ for clusters with size $i = 100$. We find that the clusters deviate remarkably from spherical - with ellipsoidal axis ratios for critical cluster sizes typically within $b/c = 0.7\pm 0.05$ and $a/c = 0.5 \pm 0.05$. We examine cluster spin angular momentum, and find that it plays a negligible role in the cluster dynamics. The interfaces of large, stable clusters are thiner than planar equilibrium interfaces by $10-30\%$. At the critical cluster size, the cluster central densities are between $5-30\%$ lower than the bulk liquid expectations. These lower densities imply larger-than-expected surface areas, which increase the energy cost to form a surface, which lowers nucleation rates.
[ { "created": "Thu, 30 Jan 2014 14:31:08 GMT", "version": "v1" } ]
2014-04-07
[ [ "Angélil", "Raymond", "" ], [ "Diemand", "Jürg", "" ], [ "Tanaka", "Kyoko K.", "" ], [ "Tanaka", "Hidekazu", "" ] ]
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1401.8001
Evan Scannapieco
Sharanya Sur, Liubin Pan, Evan Scannapieco
Mixing in Magnetized Turbulent Media
16 pages, 8 figures, ApJ, in press
null
10.1088/0004-637X/784/2/94
null
astro-ph.GA physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Turbulent motions are essential to the mixing of entrained fluids and are also capable of amplifying weak initial magnetic fields by small-scale dynamo action. Here we perform a systematic study of turbulent mixing in magnetized media, using three-dimensional magnetohydrodynamic simulations that include a scalar concentration field. We focus on how mixing depends on the magnetic Prandtl number, Pm, from 1 to 4 and the Mach number, M}, from 0.3 to 2.4. For all subsonic flows, we find that the velocity power spectrum has a k^-5/3 slope in the early, kinematic phase, but steepens due to magnetic back reactions as the field saturates. The scalar power spectrum, on the other hand, flattens compared to k^-5/3 at late times, consistent with the Obukohov-Corrsin picture of mixing as a cascade process. At higher Mach numbers, the velocity power spectrum also steepens due to the presence of shocks, and the scalar power spectrum again flattens accordingly. Scalar structures are more intermittent than velocity structures in subsonic turbulence while for supersonic turbulence, velocity structures appear more intermittent than the scalars only in the kinematic phase. Independent of the Mach number of the flow, scalar structures are arranged in sheets in both the kinematic and saturated phases of the magnetic field evolution. For subsonic turbulence, scalar dissipation is hindered in the strong magnetic field regions, probably due to Lorentz forces suppressing the buildup of scalar gradients, while for supersonic turbulence, scalar dissipation increases monotonically with increasing magnetic field strength. At all Mach numbers, mixing is significantly slowed by the presence of dynamically-important small-scale magnetic fields, implying that mixing in the interstellar medium and in galaxy clusters is less efficient than modeled in hydrodynamic simulations.
[ { "created": "Thu, 30 Jan 2014 21:07:31 GMT", "version": "v1" }, { "created": "Mon, 3 Feb 2014 05:26:14 GMT", "version": "v2" } ]
2015-06-18
[ [ "Sur", "Sharanya", "" ], [ "Pan", "Liubin", "" ], [ "Scannapieco", "Evan", "" ] ]
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1401.8007
Xiangbao Yin Yin Xiangbao
Xiangbao Yin
The effect of incident angle of pumping light on Cholesteric Liquid Crystal tunable laser wavelength
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physics.optics
http://creativecommons.org/licenses/by-nc-sa/3.0/
One notable feature of dye doped cholesteric liquid crystal is the variation of pitch and refractive index as the incidence angle of the pumping light shifts. Based on this feature, this paper studies the effects of pumping light's incidence angle on emission properties of the dye doped cholesteric liquid crystal tunable laser. First, we investigated the relationship among the concentration of chiral reagent, the incidence angle of the pumping light, and the pitch of liquid-crystal display (LCD); then we made a tunable-wavelength laser and pumped the prepared sample with 532nm laser outputted from the Nd: YAG multi-frequency pulse laser. As the incident angle of the pumping light shifts between 20 {\deg} ~ 90 {\deg}, the tuning range of the wavelength emitted by the laser reaches 10.73nm, ranging between 647.38nm and 658.11nm.
[ { "created": "Wed, 29 Jan 2014 04:47:21 GMT", "version": "v1" } ]
2014-02-03
[ [ "Yin", "Xiangbao", "" ] ]
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1401.8008
David Venuto
David Venuto, Toby Dylan Hocking, Lakjaree Sphanurattana, Masashi Sugiyama
Support vector comparison machines
null
null
null
null
stat.ML cs.LG
http://creativecommons.org/licenses/by/4.0/
In ranking problems, the goal is to learn a ranking function from labeled pairs of input points. In this paper, we consider the related comparison problem, where the label indicates which element of the pair is better, or if there is no significant difference. We cast the learning problem as a margin maximization, and show that it can be solved by converting it to a standard SVM. We use simulated nonlinear patterns, a real learning to rank sushi data set, and a chess data set to show that our proposed SVMcompare algorithm outperforms SVMrank when there are equality pairs.
[ { "created": "Thu, 30 Jan 2014 21:49:16 GMT", "version": "v1" }, { "created": "Wed, 20 Dec 2017 21:44:21 GMT", "version": "v2" }, { "created": "Thu, 23 Jul 2020 23:55:11 GMT", "version": "v3" } ]
2020-07-27
[ [ "Venuto", "David", "" ], [ "Hocking", "Toby Dylan", "" ], [ "Sphanurattana", "Lakjaree", "" ], [ "Sugiyama", "Masashi", "" ] ]
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Support vector comparison machines
https://arxiv.org/abs/1401.8008v3
https://arxiv.org/pdf/1401.8008v3.pdf
https://github.com/tdhock/rankSVMcompare
true
true
https://paperswithcode.com/paper/support-vector-comparison-machines
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1401.8009
Alexander Turbiner
Horacio Olivares-Pil\'on and Alexander V. Turbiner
The H$_2^+$ molecular ion: low-lying states
45 pages, 10 tables, 35 figures, 33 refs., text partly rewritten, 2 tables removed, 3 figures removed but 3 added, 3 references added
Annals of Physics 373 (2016) 581-608
10.1016/j.aop.2016.07.018
null
quant-ph physics.atom-ph physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Matching for a wavefunction the WKB expansion at large distances and Taylor expansion at small distances leads to a compact, few-parametric uniform approximation found in {\it J. Phys. B44, 101002 (2011)}. The ten low-lying eigenstates of H$_2^+$ of the quantum numbers $(n,m,\La,\pm)$\, with $n=m=0$ at $\La=0,1,2$, with $n=1$, $m=0$ and $n=0$, $m=1$ at $\La=0$ of both parities are explored for all interproton distances $R$. For all these states this approximation provides the relative accuracy $\lesssim 10^{-5}$ (not less than 5 s.d.) locally, for any real coordinate $x$ in eigenfunctions, when for total energy $E(R)$ it gives 10-11 s.d. for $R \in [0,50]$~a.u. Corrections to the approximation are evaluated in the specially-designed, convergent perturbation theory. Separation constants are found with not less than 8 s.d. The oscillator strength for the electric dipole transitions $E1$ is calculated with not less than 6~s.d. A dramatic dip in the $E1$ oscillator strength $f_{1s\si_g-3p\si_u}$ at $R \sim R_{eq}$ is observed. The magnetic dipole and electric quadrupole transitions are calculated for the first time with not less than 6~s.d. in oscillator strength. For two lowest states $(0,0,0,\pm)$ (or, equivalently, $1s\si_g$ and $2p\si_u$ states) the potential curves are checked and confirmed in the Lagrange mesh method within 12~s.d. Based on them the Energy Gap between $1s\si_g$ and $2p\si_u$ potential curves is approximated with modified Pade $R e^{-R} [Pade(8/7)](R)$ with not less than 4-5 figures at $R \in [0, 40]$\,a.u. Sum of potential curves $E_{1s\si_g} + E_{2p\si_u}$ is approximated by Pade $1/R [Pade(5/8)](R)$ in $R \in [0, 40]$\,a.u. with not less than {3-4} figures.
[ { "created": "Thu, 30 Jan 2014 21:51:19 GMT", "version": "v1" }, { "created": "Sat, 30 Apr 2016 14:10:30 GMT", "version": "v2" }, { "created": "Sat, 14 May 2016 18:25:59 GMT", "version": "v3" } ]
2019-08-13
[ [ "Olivares-Pilón", "Horacio", "" ], [ "Turbiner", "Alexander V.", "" ] ]
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1401.8019
Pawel Tecmer
Katharina Boguslawski, Pawe{\l} Tecmer, Paul W. Ayers, Patrick Bultinck, Stijn De Baerdemacker, Dimitri Van Neck
Efficient description of strongly correlated electrons with mean-field cost
4 pages, 4 figures
Phys. Rev. B, 89, 201106(R) (2014)
10.1103/PhysRevB.89.201106
null
cond-mat.str-el physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present an efficient approach to the electron correlation problem that is well-suited for strongly interacting many-body systems, but requires only mean-field-like computational cost. %which is based on orbital optimization of electron pairs. The performance of our approach is illustrated for the one-dimensional Hubbard model with periodic boundary conditions for different chain lengths, and for the non-relativistic quantum chemical Hamiltonian exploring the symmetric dissociation of the H$_{50}$ hydrogen chain.
[ { "created": "Thu, 30 Jan 2014 22:57:58 GMT", "version": "v1" }, { "created": "Tue, 15 Apr 2014 21:42:02 GMT", "version": "v2" }, { "created": "Sat, 2 Aug 2014 21:54:50 GMT", "version": "v3" } ]
2014-08-05
[ [ "Boguslawski", "Katharina", "" ], [ "Tecmer", "Paweł", "" ], [ "Ayers", "Paul W.", "" ], [ "Bultinck", "Patrick", "" ], [ "De Baerdemacker", "Stijn", "" ], [ "Van Neck", "Dimitri", "" ] ]
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1401.8022
Lili Su
Lili Su, Olgica Milenkovic
Synchronizing Rankings via Interactive Communication
null
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider the problem of exact synchronization of two rankings at remote locations connected by a two-way channel. Such synchronization problems arise when items in the data are distinguishable, as is the case for playlists, tasklists, crowdvotes and recommender systems rankings. Our model accounts for different constraints on the communication throughput of the forward and feedback links, resulting in different anchoring, syndrome and checksum computation strategies. Information editing is assumed of the form of deletions, insertions, block deletions/insertions, translocations and transpositions. The protocols developed under the given model are order-optimal with respect to genie aided lower bounds.
[ { "created": "Thu, 30 Jan 2014 23:10:59 GMT", "version": "v1" }, { "created": "Wed, 12 Feb 2014 00:41:32 GMT", "version": "v2" } ]
2014-02-13
[ [ "Su", "Lili", "" ], [ "Milenkovic", "Olgica", "" ] ]
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1401.8023
David Wood
Bradley Baetz and David R. Wood
Brooks' Vertex-Colouring Theorem in Linear Time
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null
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Technical Report CS-AAG-2001-05, Basser Department of Computer Science, The University of Sydney, 2001
cs.DM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Brooks' Theorem [R. L. Brooks, On Colouring the Nodes of a Network, Proc. Cambridge Philos. Soc.} 37:194-197, 1941] states that every graph $G$ with maximum degree $\Delta$, has a vertex-colouring with $\Delta$ colours, unless $G$ is a complete graph or an odd cycle, in which case $\Delta+1$ colours are required. Lov\'asz [L. Lov\'asz, Three short proofs in graph theory, J. Combin. Theory Ser. 19:269-271, 1975] gives an algorithmic proof of Brooks' Theorem. Unfortunately this proof is missing important details and it is thus unclear whether it leads to a linear time algorithm. In this paper we give a complete description of the proof of Lov\'asz, and we derive a linear time algorithm for determining the vertex-colouring guaranteed by Brooks' Theorem.
[ { "created": "Thu, 30 Jan 2014 23:11:08 GMT", "version": "v1" } ]
2014-02-03
[ [ "Baetz", "Bradley", "" ], [ "Wood", "David R.", "" ] ]
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1401.8030
Asif Haque
Asif Haque
Transit Fare Arbitrage: Case Study of San Francisco Bay Area Rapid Transit (BART) System
null
null
null
null
cs.CY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Transit fare arbitrage is the scenario when two or more commuters agree to swap tickets during travel in such a way that total cost is lower than otherwise. Such arbitrage allows pricing inefficiencies to be explored and exploited, leading to improved pricing models. In this paper we discuss the basics of fare arbitrage through an intuitive pricing framework involving population density. We then analyze the San Francisco Bay Area Rapid Transit (BART) system to understand underlying inefficiencies. We also provide source code and comprehensive list of pairs of trips with significant arbitrage gain at github.com/asifhaque/transit-arbitrage. Finally, we point towards a uniform payment interface for different kinds of transit systems.
[ { "created": "Thu, 30 Jan 2014 23:45:01 GMT", "version": "v1" } ]
2014-02-03
[ [ "Haque", "Asif", "" ] ]
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1401.8032
Kirsty Hannam
Kirsty Hannam, David A. Powell, Ilya V. Shadrivov and Yuri S. Kivshar
Broadband chiral metamaterials with large optical activity
6 pages, 7 figures, submitted to Phys. Rev. B
null
10.1103/PhysRevB.89.125105
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study theoretically and experimentally a novel type of metamaterial with hybrid elements composed of twisted pairs of cross-shaped meta-atoms and their complements. We reveal that such two-layer metasurfaces demonstrate large, dispersionless optical activity at the transmission resonance accompanied by very low ellipticity. We develop a retrieval procedure to determine the effective material parameters for this structure, which has lower-order symmetry ($\mathrm {C}_4$) than other commonly studied chiral structures. We verify our new theoretical approach by reproducing numerical and experimental scattering parameters.
[ { "created": "Thu, 30 Jan 2014 23:59:28 GMT", "version": "v1" } ]
2015-06-18
[ [ "Hannam", "Kirsty", "" ], [ "Powell", "David A.", "" ], [ "Shadrivov", "Ilya V.", "" ], [ "Kivshar", "Yuri S.", "" ] ]
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1401.8038
Sergei Chichin
Sergei Chichin, Quoc Bao Vo, Ryszard Kowalczyk
Truthful Market-based Trading of Cloud Resources with Reservation Price
10 pages, 18 figures
null
null
null
cs.GT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
With the rapidly growing demand for the cloud services, a need for efficient methods to trade computing resources increases. Commonly used fixed-price model is not always the best approach for trading cloud resources, because of its inflexible and static nature. Dynamic trading systems, which make use of market mechanisms, show promise for more efficient resource allocation and pricing in the cloud. However, most of the existing mechanisms ignore the seller's costs of providing the resources. In order to address it, we propose a single-sided market mechanism for trading virtual machine instances in the cloud, where the cloud provider can express the reservation prices for traded cloud services. We investigate the theoretical properties of the proposed mechanism and prove that it is truthful, i.e. the buyers do not have an incentive to lie about their true valuation of the resources. We perform extensive experiments in order to investigate the impact of the reserve price on the market outcome. Our experiments show that the proposed mechanism yields near optimal allocations and has a low execution time.
[ { "created": "Fri, 31 Jan 2014 02:07:15 GMT", "version": "v1" } ]
2014-02-03
[ [ "Chichin", "Sergei", "" ], [ "Vo", "Quoc Bao", "" ], [ "Kowalczyk", "Ryszard", "" ] ]
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null
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1401.8039
Shinji Okada
S. Okada, D. A. Bennett, W. B. Doriese, J. W. Fowler, K. D. Irwin, S. Ishimoto, M. Sato, D. R. Schmidt, D. S. Swetz, H. Tatsuno, J. N. Ullom, S. Yamada
High-resolution kaonic-atom x-ray spectroscopy with transition-edge-sensor microcalorimeters
6 pages, 3 figures, Proceedings of 15th International Workshop on Low Temperature Detectors (LTD-15, Pasadena, California, June 24-28, 2013), To be published in a special issue of the Journal of Low Temperature Physics (JLTP)
null
10.1007/s10909-014-1137-1
null
physics.ins-det nucl-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We are preparing for an ultra-high resolution x-ray spectroscopy of kaonic atoms using an x-ray spectrometer based on an array of superconducting transition-edge-sensor microcalorimeters developed by NIST. The instrument has excellent energy resolutions of 2 - 3 eV (FWHM) at 6 keV and a large collecting area of about 20 mm^2. This will open new door to investigate kaon-nucleus strong interaction and provide new accurate charged-kaon mass value.
[ { "created": "Fri, 31 Jan 2014 02:16:00 GMT", "version": "v1" }, { "created": "Wed, 19 Feb 2014 00:57:26 GMT", "version": "v2" } ]
2014-03-06
[ [ "Okada", "S.", "" ], [ "Bennett", "D. A.", "" ], [ "Doriese", "W. B.", "" ], [ "Fowler", "J. W.", "" ], [ "Irwin", "K. D.", "" ], [ "Ishimoto", "S.", "" ], [ "Sato", "M.", "" ], [ "Schmidt", "D. R.", "" ], [ "Swetz", "D. S.", "" ], [ "Tatsuno", "H.", "" ], [ "Ullom", "J. N.", "" ], [ "Yamada", "S.", "" ] ]
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1401.8042
Kun Tu
Kun Tu, Bruno Ribeiro, Hua Jiang, Xiaodong Wang, David Jensen, Benyuan Liu and Don Towsley
Online Dating Recommendations: Matching Markets and Learning Preferences
6 pages, 4 figures, submission on 5th International Workshop on Social Recommender Systems
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cs.SI cs.IR physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Recommendation systems for online dating have recently attracted much attention from the research community. In this paper we proposed a two-side matching framework for online dating recommendations and design an LDA model to learn the user preferences from the observed user messaging behavior and user profile features. Experimental results using data from a large online dating website shows that two-sided matching improves significantly the rate of successful matches by as much as 45%. Finally, using simulated matchings we show that the the LDA model can correctly capture user preferences.
[ { "created": "Fri, 31 Jan 2014 02:30:31 GMT", "version": "v1" } ]
2014-02-03
[ [ "Tu", "Kun", "" ], [ "Ribeiro", "Bruno", "" ], [ "Jiang", "Hua", "" ], [ "Wang", "Xiaodong", "" ], [ "Jensen", "David", "" ], [ "Liu", "Benyuan", "" ], [ "Towsley", "Don", "" ] ]
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1401.8044
Kevin Carlberg
Kevin Carlberg, Ray Tuminaro, and Paul Boggs
Preserving Lagrangian structure in nonlinear model reduction with application to structural dynamics
Submitted to SIAM Journal on Scientific Computing (SISC)
SIAM Journal on Scientific Computing, Vol. 37, No. 2, p. B153-B184 (2015)
10.1137/140959602
null
cs.CE math.NA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This work proposes a model-reduction methodology that preserves Lagrangian structure (equivalently Hamiltonian structure) and achieves computational efficiency in the presence of high-order nonlinearities and arbitrary parameter dependence. As such, the resulting reduced-order model retains key properties such as energy conservation and symplectic time-evolution maps. We focus on parameterized simple mechanical systems subjected to Rayleigh damping and external forces, and consider an application to nonlinear structural dynamics. To preserve structure, the method first approximates the system's `Lagrangian ingredients'---the Riemannian metric, the potential-energy function, the dissipation function, and the external force---and subsequently derives reduced-order equations of motion by applying the (forced) Euler--Lagrange equation with these quantities. From the algebraic perspective, key contributions include two efficient techniques for approximating parameterized reduced matrices while preserving symmetry and positive definiteness: matrix gappy POD and reduced-basis sparsification (RBS). Results for a parameterized truss-structure problem demonstrate the importance of preserving Lagrangian structure and illustrate the proposed method's merits: it reduces computation time while maintaining high accuracy and stability, in contrast to existing nonlinear model-reduction techniques that do not preserve structure.
[ { "created": "Fri, 31 Jan 2014 02:43:14 GMT", "version": "v1" } ]
2015-04-16
[ [ "Carlberg", "Kevin", "" ], [ "Tuminaro", "Ray", "" ], [ "Boggs", "Paul", "" ] ]
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1401.8045
Chang Qing Sun Dr
Chang Q Sun
A Supersolid Skin Covering both Water and Ice
null
null
10.1039/C4CP02516D
null
cond-mat.soft cond-mat.mtrl-sci physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The mysterious nature and functionality of water and ice skins remain baffling to the community since 1859 when Farady firstly proposed liquid skin lubricating ice. Here we show the presence of supersolid phase that covers both water and ice using Raman spectroscopy measurements and quantum calculations. In the skin of two molecular layers thick, molecular undercoordination shortens the H-O bond by ~16% and lengthens the OH nonbond by ~25% through repulsion between electron pairs on adjacent O atoms, which depresses the density from 0.92 for bulk ice to 0.75 gcm-3. The O:H-O cooperative relaxation stiffens the H-O stretching phonon from 3200/3150 cm-1 to the same value of 3450 cm-1 and raises the melting temperature of both skins by up to ~310 K. Numerical derivatives on the viscosity and charge accumulation suggests that the elastic, polarized, and thermally stable supersolid phase makes the ice frictionless and water skin hydrophobic and ice like at room temperature.
[ { "created": "Fri, 31 Jan 2014 02:43:58 GMT", "version": "v1" } ]
2014-09-26
[ [ "Sun", "Chang Q", "" ] ]
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1401.8046
Nerio Borges
Nerio Borges (Universidad Sim\'on Bol\'ivar), Blai Bonet (Universidad Sim\'on Bol\'ivar)
Universal First-Order Logic is Superfluous for NL, P, NP and coNP
null
Logical Methods in Computer Science, Volume 10, Issue 1 (March 3, 2014) lmcs:1011
10.2168/LMCS-10(1:15)2014
null
cs.LO cs.CC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this work we continue the syntactic study of completeness that began with the works of Immerman and Medina. In particular, we take a conjecture raised by Medina in his dissertation that says if a conjunction of a second-order and a first-order sentences defines an NP-complete problems via fops, then it must be the case that the second-order conjoint alone also defines a NP-complete problem. Although this claim looks very plausible and intuitive, currently we cannot provide a definite answer for it. However, we can solve in the affirmative a weaker claim that says that all ``consistent'' universal first-order sentences can be safely eliminated without the fear of losing completeness. Our methods are quite general and can be applied to complexity classes other than NP (in this paper: to NLSPACE, PTIME, and coNP), provided the class has a complete problem satisfying a certain combinatorial property.
[ { "created": "Fri, 31 Jan 2014 02:44:45 GMT", "version": "v1" }, { "created": "Fri, 28 Feb 2014 09:03:06 GMT", "version": "v2" } ]
2015-07-01
[ [ "Borges", "Nerio", "", "Universidad Simón Bolívar" ], [ "Bonet", "Blai", "", "Universidad\n Simón Bolívar" ] ]
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1401.8048
Edward Witten
Edward Witten
A Note On Einstein, Bergmann, and the Fifth Dimension
8 pp
null
null
null
physics.hist-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This note is devoted to a detail concerning the work of Albert Einstein and Peter Bergmann on unified theories of electromagnetism and gravitation in five dimensions. In their paper of 1938, Einstein and Bergmann were among the first to introduce the modern viewpoint in which a four-dimensional theory that coincides with Einstein-Maxwell theory at long distances is derived from a five-dimensional theory with complete symmetry among all five dimensions. But then they drew back, modifying the theory in a way that spoiled the five-dimensional symmetry and looks contrived to modern readers. Why? According to correspondence of Peter Bergmann with the author, the reason was that the more symmetric version of the theory predicts the existence of a new long range field (a massless scalar field). In 1938, Einstein and Bergmann did not wish to make this prediction. (Based on a lecture at the Einstein Centennial Celebration at the Library of Alexandria, June, 2005.
[ { "created": "Fri, 31 Jan 2014 02:50:34 GMT", "version": "v1" } ]
2014-02-03
[ [ "Witten", "Edward", "" ] ]
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1401.8053
Ognjen Arandjelovi\'c PhD
Ognjen Arandjelovic
Hallucinating optimal high-dimensional subspaces
Pattern Recognition, 2014
null
null
null
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Linear subspace representations of appearance variation are pervasive in computer vision. This paper addresses the problem of robustly matching such subspaces (computing the similarity between them) when they are used to describe the scope of variations within sets of images of different (possibly greatly so) scales. A naive solution of projecting the low-scale subspace into the high-scale image space is described first and subsequently shown to be inadequate, especially at large scale discrepancies. A successful approach is proposed instead. It consists of (i) an interpolated projection of the low-scale subspace into the high-scale space, which is followed by (ii) a rotation of this initial estimate within the bounds of the imposed ``downsampling constraint''. The optimal rotation is found in the closed-form which best aligns the high-scale reconstruction of the low-scale subspace with the reference it is compared to. The method is evaluated on the problem of matching sets of (i) face appearances under varying illumination and (ii) object appearances under varying viewpoint, using two large data sets. In comparison to the naive matching, the proposed algorithm is shown to greatly increase the separation of between-class and within-class similarities, as well as produce far more meaningful modes of common appearance on which the match score is based.
[ { "created": "Fri, 31 Jan 2014 03:28:10 GMT", "version": "v1" } ]
2014-02-03
[ [ "Arandjelovic", "Ognjen", "" ] ]
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1401.8064
Tanran Zhang
Ben Niu, Tanran Zhang, Xiaoyan Zhu, Hui Li and Zongqing Lu
Priority-Aware Private Matching Schemes for Proximity-Based Mobile Social Networks
15 pages, 18 figures
null
null
null
cs.CR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The rapid developments of mobile devices and online social networks have resulted in increasing attention to Mobile Social Networking (MSN). The explosive growth of mobile-connected and location-aware devices makes it possible and meaningful to do the Proximity-based Mobile Social Networks (PMSNs). Users can discover and make new social interactions easily with physical-proximate mobile users through WiFi/Bluetooth interfaces embedded in their smartphones. However, users enjoy these conveniences at the cost of their growing privacy concerns. To address this problem, we propose a suit of priority-aware private matching schemes to privately match the similarity with potential friends in the vicinity. Unlike most existing work, our proposed priority-aware matching scheme (P-match) achieves the privacy goal by combining the commutative encryption function and the Tanimoto similarity coefficient which considers both the number of common attributes between users as well as the corresponding priorities on each common attribute. Further, based on the newly constructed similarity function which takes the ratio of attributes matched over all the input set into consideration, we design an enhanced version to deal with some potential attacks such as unlimitedly inputting the attribute set on either the initiator side or the responder side, etc. Finally, our proposed E-match avoids the heavy cryptographic operations and improves the system performance significantly by employing a novel use of the Bloom filter. The security and communication/computation overhead of our schemes are thoroughly analyzed and evaluated via detailed simulations and implementation.
[ { "created": "Fri, 31 Jan 2014 05:27:10 GMT", "version": "v1" } ]
2014-02-03
[ [ "Niu", "Ben", "" ], [ "Zhang", "Tanran", "" ], [ "Zhu", "Xiaoyan", "" ], [ "Li", "Hui", "" ], [ "Lu", "Zongqing", "" ] ]
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1401.8065
Yoshihiro Yura
Yoshihiro Yura and Hideki Takayasu and Didier Sornette and Misako Takayasu
Financial Brownian particle in the layered order book fluid and Fluctuation-Dissipation relations
null
null
10.1103/PhysRevLett.112.098703
null
q-fin.TR physics.data-an physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We introduce a novel description of the dynamics of the order book of financial markets as that of an effective colloidal Brownian particle embedded in fluid particles. The analysis of a comprehensive market data enables us to identify all motions of the fluid particles. Correlations between the motions of the Brownian particle and its surrounding fluid particles reflect specific layering interactions; in the inner-layer, the correlation is strong and with short memory while, in the outer-layer, it is weaker and with long memory. By interpreting and estimating the contribution from the outer-layer as a drag resistance, we demonstrate the validity of the fluctuation-dissipation relation (FDR) in this non-material Brownian motion process.
[ { "created": "Fri, 31 Jan 2014 05:29:40 GMT", "version": "v1" } ]
2015-06-18
[ [ "Yura", "Yoshihiro", "" ], [ "Takayasu", "Hideki", "" ], [ "Sornette", "Didier", "" ], [ "Takayasu", "Misako", "" ] ]
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1401.8069
Reena Philips Mrs
Rashmi N, Suma V
Defect Detection Efficiency A Combined Approach
6 Pages, 2 Figures
International Journal of Advanced Computer Research (ISSN (print): 2249 - 7277 ISSN (online): 2277 - 7970) Volume - 3 Number - 3 Issue - 11 September - 2013
null
null
cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Survival of IT industries depends much upon the development of high quality and customer satisfied software products. Quality however can be viewed from various perspectives such as deployment of the products within estimated resources, constrains and also being defect free. Testing is one of the promising techniques ever since the inception of software in the global market. Though there are several testing techniques existing, the most widely accepted is the conventional scripted testing. Despite of advancement in the technology, achieving defect free deliverables is yet a challenge. This paper therefore aims to enhance the existing testing techniques in order to achieve nearly zero defect products through the combined approach of scripted and exploratory testing. This approach thus enables the testing team to capture maximum defects and thereby reduce the expensive nature of overheads. Further, it leads towards generation of high quality products and assures the continued customer satisfaction.
[ { "created": "Fri, 31 Jan 2014 06:48:59 GMT", "version": "v1" } ]
2014-02-03
[ [ "N", "Rashmi", "" ], [ "V", "Suma", "" ] ]
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1401.8071
Sascha Kurz
Miriam Kie{\ss}ling, Sascha Kurz, and J\"org Rambau
An exact column-generation approach for the lot-type design problem -- extended abstract
4 pages, 2 tables, presented at ISCO 2012
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null
null
math.OC cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider a fashion discounter that supplies any of its many branches with an integral multiple of lots whose size assortment structure stems from a set of many applicable lot-types. We design a column generation algorithm for the optimal approximation of the branch and size dependent demand by a supply using a bounded number of lot-types.
[ { "created": "Fri, 31 Jan 2014 06:54:57 GMT", "version": "v1" } ]
2016-03-26
[ [ "Kießling", "Miriam", "" ], [ "Kurz", "Sascha", "" ], [ "Rambau", "Jörg", "" ] ]
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1401.8072
J\"urgen M\"unch
Ove Armbrust, Masafumi Katahira, Yuko Miyamoto, J\"urgen M\"unch, Haruka Nakao, Alexis Ocampo
Scoping Software Process Models - Initial Concepts and Experience from Defining Space Standards
13 pages. The final publication is available at http://link.springer.com/chapter/10.1007%2F978-3-540-79588-9_15
Making Globally Distributed Software Development a Success Story, volume 5007 of Lecture Notes in Computer Science, pages 160-172. Springer Berlin Heidelberg, 2008
10.1007/978-3-540-79588-9_15
null
cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Defining process standards by integrating, harmonizing, and standardizing heterogeneous and often implicit processes is an important task, especially for large development organizations. However, many challenges exist, such as limiting the scope of process standards, coping with different levels of process model abstraction, and identifying relevant process variabilities to be included in the standard. On the one hand, eliminating process variability by building more abstract models with higher degrees of interpretation has many disadvantages, such as less control over the process. Integrating all kinds of variability, on the other hand, leads to high process deployment costs. This article describes requirements and concepts for determining the scope of process standards based on a characterization of the potential products to be produced in the future, the projects expected for the future, and the respective process capabilities needed. In addition, the article sketches experience from determining the scope of space process standards for satellite software development. Finally, related work with respect to process model scoping, conclusions, and an outlook on future work are presented.
[ { "created": "Fri, 31 Jan 2014 06:58:00 GMT", "version": "v1" } ]
2014-02-03
[ [ "Armbrust", "Ove", "" ], [ "Katahira", "Masafumi", "" ], [ "Miyamoto", "Yuko", "" ], [ "Münch", "Jürgen", "" ], [ "Nakao", "Haruka", "" ], [ "Ocampo", "Alexis", "" ] ]
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