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1402.4997
Alfredo Luis
Alfredo Luis and Angel S. Sanz
Nonclassical polarization dynamics in classical-like states
8 pages, 3 figures
Phys. Rev. A 92, 023832 (2015)
10.1103/PhysRevA.92.023832
null
quant-ph physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Quantum polarization is investigated by means of a trajectory picture based on the Bohmian formulation of quantum mechanics. Relevant examples of classical-like two-mode field states are thus examined, namely Glauber and SU(2) coherent states. Although these states are often regarded as classical, the analysis here shows that the corresponding electric-field polarization trajectories display topologies very different from those expected from classical electrodynamics. Rather than incompatibility with the usual classical model, this result demonstrates the dynamical richness of quantum motions, determined by local variations of the system quantum phase in the corresponding (polarization) configuration space, absent in classical-like models. These variations can be related to the evolution in time of the phase, but also to its dependence on configurational coordinates, which is the crucial factor to generate motion in the case of stationary states like those here considered. In this regard, for completeness these results are compared those obtained from nonclassical N00N states.
[ { "created": "Thu, 20 Feb 2014 13:53:25 GMT", "version": "v1" }, { "created": "Tue, 23 Dec 2014 20:38:51 GMT", "version": "v2" }, { "created": "Tue, 1 Sep 2015 05:41:17 GMT", "version": "v3" } ]
2015-09-02
[ [ "Luis", "Alfredo", "" ], [ "Sanz", "Angel S.", "" ] ]
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1402.4998
Dries van Oosten
H. Zhang, S. A. Wolbers, D. M. Krol, J. I. Dijkhuis, and D. van Oosten
Modelling and experiments of self-reflectivity under femtosecond ablation conditions
11 pages, 8 figures
null
null
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a numerical model which describes the propagation of a single femtosecond laser pulse in a medium of which the optical properties dynamically change within the duration of the pulse. We use a Finite Difference Time Domain (FDTD) method to solve the Maxwell's equations coupled to equations describing the changes in the material properties. We use the model to simulate the self-reflectivity of strongly focused femtosecond laser pulses on silicon and gold under laser ablation condition. We compare the simulations to experimental results and find excellent agreement.
[ { "created": "Thu, 20 Feb 2014 13:54:54 GMT", "version": "v1" } ]
2014-02-21
[ [ "Zhang", "H.", "" ], [ "Wolbers", "S. A.", "" ], [ "Krol", "D. M.", "" ], [ "Dijkhuis", "J. I.", "" ], [ "van Oosten", "D.", "" ] ]
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1402.5003
Magnus M. Halldorsson
Marijke H.L. Bodlaender and Magn\'us M. Halld\'orsson
Beyond Geometry : Towards Fully Realistic Wireless Models
null
null
null
null
cs.NI cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Signal-strength models of wireless communications capture the gradual fading of signals and the additivity of interference. As such, they are closer to reality than other models. However, nearly all theoretic work in the SINR model depends on the assumption of smooth geometric decay, one that is true in free space but is far off in actual environments. The challenge is to model realistic environments, including walls, obstacles, reflections and anisotropic antennas, without making the models algorithmically impractical or analytically intractable. We present a simple solution that allows the modeling of arbitrary static situations by moving from geometry to arbitrary decay spaces. The complexity of a setting is captured by a metricity parameter Z that indicates how far the decay space is from satisfying the triangular inequality. All results that hold in the SINR model in general metrics carry over to decay spaces, with the resulting time complexity and approximation depending on Z in the same way that the original results depends on the path loss term alpha. For distributed algorithms, that to date have appeared to necessarily depend on the planarity, we indicate how they can be adapted to arbitrary decay spaces. Finally, we explore the dependence on Z in the approximability of core problems. In particular, we observe that the capacity maximization problem has exponential upper and lower bounds in terms of Z in general decay spaces. In Euclidean metrics and related growth-bounded decay spaces, the performance depends on the exact metricity definition, with a polynomial upper bound in terms of Z, but an exponential lower bound in terms of a variant parameter phi. On the plane, the upper bound result actually yields the first approximation of a capacity-type SINR problem that is subexponential in alpha.
[ { "created": "Thu, 20 Feb 2014 14:11:14 GMT", "version": "v1" } ]
2014-02-21
[ [ "Bodlaender", "Marijke H. L.", "" ], [ "Halldórsson", "Magnús M.", "" ] ]
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1402.5006
Dahe Liu
Juan Liu, Jiulin Shi, Yijun Tang, Kaixing Zhu, Yuan Ge, Xuegang Chen, Xingdao He, Dahe Liu
Effect of atmospheric environment on the attenuation coefficient of light in water
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null
null
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physics.ao-ph physics.geo-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The attenuation coefficient of 532 nm light in water under different atmospheric conditions was investigated. Measurements were made over a two-year period at the same location and show that the attenuation coefficient is significantly influenced by the atmospheric environment. It is lowest when the atmospheric pressure is high and temperature is low, and is highest when the atmospheric pressure is low and temperature is high. The maximum attenuation coefficient of pure water in these studies was about three times the minimum value. The mechanism of the phenomena is discussed. These results are also important in underwater acoustics.
[ { "created": "Thu, 20 Feb 2014 14:15:53 GMT", "version": "v1" } ]
2014-02-21
[ [ "Liu", "Juan", "" ], [ "Shi", "Jiulin", "" ], [ "Tang", "Yijun", "" ], [ "Zhu", "Kaixing", "" ], [ "Ge", "Yuan", "" ], [ "Chen", "Xuegang", "" ], [ "He", "Xingdao", "" ], [ "Liu", "Dahe", "" ] ]
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1402.5007
Romain Garnier
Romain Garnier, Andr\'e Barka, Olivier Pascal
Efficient periodic band diagram computation using a finite element method, Arnoldi eigensolver and sparse linear system solver
null
Computer Physics Communications, Volume 184, Issue 7, July 2013, Pages 1673-1682
10.1016/j.cpc.2013.02.011
null
physics.comp-ph
http://creativecommons.org/licenses/by-nc-sa/3.0/
We present here a Finite Element Method devoted to the simulation of 3D periodic structures of arbitrary geometry. The numerical method based on ARPACK and PARDISO libraries, is discussed with the aim of extracting the eigenmodes of periodical structures and thus establishing their frequency band gaps. Simulation parameters and the computational optimization are the focus. Resolution will be used to characterize EBG (Electromagnetic Band Gap) structures, such as plasma rods and metallic cubes.
[ { "created": "Thu, 20 Feb 2014 14:16:33 GMT", "version": "v1" } ]
2014-02-21
[ [ "Garnier", "Romain", "" ], [ "Barka", "André", "" ], [ "Pascal", "Olivier", "" ] ]
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1402.5010
Quentin Merigot
Hiba Abdallah (LJK), Quentin M\'erigot (LJK)
On the reconstruction of convex sets from random normal measurements
null
null
null
null
cs.CG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the problem of reconstructing a convex body using only a finite number of measurements of outer normal vectors. More precisely, we suppose that the normal vectors are measured at independent random locations uniformly distributed along the boundary of our convex set. Given a desired Hausdorff error eta, we provide an upper bounds on the number of probes that one has to perform in order to obtain an eta-approximation of this convex set with high probability. Our result rely on the stability theory related to Minkowski's theorem.
[ { "created": "Thu, 20 Feb 2014 14:30:41 GMT", "version": "v1" } ]
2014-02-21
[ [ "Abdallah", "Hiba", "", "LJK" ], [ "Mérigot", "Quentin", "", "LJK" ] ]
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1402.5014
Jian-Jun Shu
Jian-Jun Shu and Graham Wilks
Heat transfer in the flow of a cold, axisymmetric jet over a hot sphere
null
Journal of Heat Transfer-Transactions of the ASME, Vol. 135, No. 3, pp. 032201, 2013
10.1115/1.4007980
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The heat transfer characteristics of thin film flow over a hot sphere resulting from a cold vertical jet of liquid falling onto the surface has been investigated. The underlying physical features have been illustrated by numerical solutions of high accuracy based on the modified Keller box method. The solutions for film thickness distribution are good agreement with those obtained approximately by using the Pohlhausen integral momentum technique and observed experimentally by using water as working fluid, thus providing a basic confirmation of the validity of the results presented.
[ { "created": "Thu, 20 Feb 2014 14:42:33 GMT", "version": "v1" }, { "created": "Fri, 7 Mar 2014 15:01:58 GMT", "version": "v2" } ]
2014-03-10
[ [ "Shu", "Jian-Jun", "" ], [ "Wilks", "Graham", "" ] ]
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1402.5018
Jian-Jun Shu
Jian-Jun Shu
Laminar film condensation heat transfer on a vertical, non-isothermal, semi-infinite plate
null
Arabian Journal for Science and Engineering, Vol. 37, No. 6, pp. 1711-1721, 2012
10.1007/s13369-012-0272-8
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper gives similarity transformations for laminar film condensation on a vertical flat plate with variable temperature distribution and finds analytical solutions for arbitrary Prandtl numbers and condensation rates. The work contrasts with Sparrow and Gregg's assertion that wall temperature variation does not permit similarity solutions. To resolve the long debatable issue regarding heat transfer of non-isothermal case, some useful formulas are obtained, including significant correlations for varying Prandtl numbers. Results are compared with the available experimental data.
[ { "created": "Thu, 20 Feb 2014 14:53:13 GMT", "version": "v1" }, { "created": "Fri, 28 Feb 2014 13:59:54 GMT", "version": "v2" } ]
2014-03-03
[ [ "Shu", "Jian-Jun", "" ] ]
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1402.5019
Yi Liu Dr
Guillaume Point, Yi Liu, Yohann Brelet, Sergey Mitryukovskiy, Pengji Ding, Aur\'elien Houard, and Andr\'e Mysyrowicz
Lasing of ambient air with microjoule pulse energy pumped by a multi terawatt IR femtosecond laser
null
null
10.1364/OL.39.001725
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We report on the lasing action of atmospheric air pumped by an 800 nm femtosecond laser pulse with peak power up to 4 TW. Lasing emission at 428 nm increases rapidly over a small range of pump laser power, followed by saturation above ~ 1.5 TW. The maximum lasing pulse energy is measured to be 2.6 uJ corresponding to an emission power in the MW range, while a maximum conversion efficiency of is measured at moderate pump pulse energy. The optical gain inside the filament plasma is estimated to be excess of 0.7/cm. The lasing emission shows a doughnut profile, reflecting the spatial distribution of the pump-generated white-light continuum that acts as a seed for the lasing. We attribute the pronounced saturation to the defocusing of the seed in the plasma amplifying region and to the saturation of the seed intensity.
[ { "created": "Thu, 20 Feb 2014 14:55:01 GMT", "version": "v1" } ]
2015-06-18
[ [ "Point", "Guillaume", "" ], [ "Liu", "Yi", "" ], [ "Brelet", "Yohann", "" ], [ "Mitryukovskiy", "Sergey", "" ], [ "Ding", "Pengji", "" ], [ "Houard", "Aurélien", "" ], [ "Mysyrowicz", "André", "" ] ]
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1402.5022
David Gagnon
David A. Gagnon, Nathan C. Keim, Xiaoning Shen, Paulo E. Arratia
Fluid-Induced Propulsion of Rigid Particles in Wormlike Micellar Solutions
null
null
10.1063/1.4896598
null
physics.flu-dyn cond-mat.soft physics.bio-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In the absence of inertia, a reciprocal swimmer achieves no net motion in a viscous Newtonian fluid. Here, we investigate the ability of a reciprocally actuated particle to translate through a complex fluid that possesses a network using tracking methods and birefringence imaging. A geometrically polar particle, a rod with a bead on one end, is reciprocally rotated using magnetic fields. The particle is immersed in a wormlike micellar (WLM) solution that is known to be susceptible to the formation of shear bands and other localized structures due to shear-induced remodeling of its microstructure. Results show that the nonlinearities present in this WLM solution break time-reversal symmetry under certain conditions, and enable propulsion of an artificial "swimmer." We find three regimes dependent on the Deborah number (De): net motion towards the bead-end of the particle at low De, net motion towards the rod-end of the particle at intermediate De, and no appreciable propulsion at high De. At low De, where the particle time-scale is longer then the fluid relaxation time, we believe that propulsion is caused by an imbalance in the fluid first normal stress differences between the two ends of the particle (bead and rod). At De~1, however, we observe the emergence of a region of network anisotropy near the rod using birefringence imaging. This anisotropy suggests alignment of the micellar network, which is "locked in" due to the shorter time-scale of the particle relative to the fluid.
[ { "created": "Thu, 20 Feb 2014 15:07:21 GMT", "version": "v1" }, { "created": "Tue, 17 Jun 2014 15:26:44 GMT", "version": "v2" }, { "created": "Tue, 15 Jul 2014 18:52:10 GMT", "version": "v3" }, { "created": "Sat, 13 Sep 2014 20:55:35 GMT", "version": "v4" } ]
2015-06-18
[ [ "Gagnon", "David A.", "" ], [ "Keim", "Nathan C.", "" ], [ "Shen", "Xiaoning", "" ], [ "Arratia", "Paulo E.", "" ] ]
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1402.5023
Jian-Jun Shu
Jian-Jun Shu and Jenn Shiun Lee
Fundamental solutions for micropolar fluids
null
Journal of Engineering Mathematics, Vol. 61, No. 1, pp. 69-79, 2008
10.1007/s10665-007-9160-8
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
New fundamental solutions for micropolar fluids are derived in explicit form for two- and three-dimensional steady unbounded Stokes and Oseen flows due to a point force and a point couple, including the two-dimensional micropolar Stokeslet, the two- and three-dimensional micropolar Stokes couplet, the three-dimensional micropolar Oseenlet, and the three-dimensional micropolar Oseen couplet. These fundamental solutions do not exist in Newtonian flow due to the absence of microrotation velocity field. The flow due to these singularities is useful for understanding and studying microscale flows. As an application, the drag coefficients for a solid sphere or a circular cylinder that translates in a low-Reynolds-number micropolar flow are determined and compared with those corresponding to Newtonian flow. The drag coefficients in a micropolar fluid are greater than those in a Newtonian fluid.
[ { "created": "Thu, 20 Feb 2014 15:09:30 GMT", "version": "v1" }, { "created": "Fri, 28 Feb 2014 14:10:02 GMT", "version": "v2" } ]
2014-03-03
[ [ "Shu", "Jian-Jun", "" ], [ "Lee", "Jenn Shiun", "" ] ]
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1402.5029
Nicolas Emilio Bordenabe
Nicol\'as E. Bordenabe, Konstantinos Chatzikokolakis, Catuscia Palamidessi
Optimal Geo-Indistinguishable Mechanisms for Location Privacy
13 pages
null
10.1145/2660267.2660345
null
cs.CR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider the geo-indistinguishability approach to location privacy, and the trade-off with respect to utility. We show that, given a desired degree of geo-indistinguishability, it is possible to construct a mechanism that minimizes the service quality loss, using linear programming techniques. In addition we show that, under certain conditions, such mechanism also provides optimal privacy in the sense of Shokri et al. Furthermore, we propose a method to reduce the number of constraints of the linear program from cubic to quadratic, maintaining the privacy guarantees and without affecting significantly the utility of the generated mechanism. This reduces considerably the time required to solve the linear program, thus enlarging significantly the location sets for which the optimal mechanisms can be computed.
[ { "created": "Thu, 20 Feb 2014 15:21:42 GMT", "version": "v1" }, { "created": "Sat, 16 Aug 2014 18:43:33 GMT", "version": "v2" }, { "created": "Sun, 24 Aug 2014 22:11:45 GMT", "version": "v3" } ]
2014-08-26
[ [ "Bordenabe", "Nicolás E.", "" ], [ "Chatzikokolakis", "Konstantinos", "" ], [ "Palamidessi", "Catuscia", "" ] ]
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Optimal Geo-Indistinguishable Mechanisms for Location Privacy
https://arxiv.org/abs/1402.5029v3
https://arxiv.org/pdf/1402.5029v3.pdf
https://github.com/chatziko/location-guard
true
true
https://paperswithcode.com/paper/optimal-geo-indistinguishable-mechanisms-for
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1402.5030
Vladimir Yuryev
Arthur N. Yuryev, prepared for publication by V. A. Yuryev
Recurrent algorithms for detection of stochastic signals in the state space
Prepared for publication in English by V. A. Yuryev in 1991; 58 pages. 9 figures. Arthur N. Yuryev (1932/07/05-1990/09/30); Y. A. Furman, A. N. Yuryev and V. V. Yanshin, Numerical methods of binary image processing and recognition. Krasnoyarsk University, Krasnoyarsk, Russia, 1992, Chapter 2; ISBN 5-7470-0204-X
null
null
null
physics.optics physics.data-an
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The paper is devoted to synthesis of recurrent algorithms for detection of stochastic signals given in state space. The structure of the algorithms synthesized is shown to be close to that of the Kalman filter. Analysis of one of the algorithms synthesized is carried out. Illustration of connection between weight coefficients of processing system, which are formed in implicit form, is given. Dynamics of amplification and feedback coefficients of the system is studied; calculation of its detection characteristics is fulfilled. Synthesis of the filters is also carried out for the continuous time. The algorithms synthesized are extended to the case of a mixture of stochastic correlated interferences and white noise. Modification of one of the algorithms is made which enables its use for solving problems of multialternative detection.
[ { "created": "Thu, 20 Feb 2014 15:24:36 GMT", "version": "v1" } ]
2014-02-21
[ [ "Yuryev", "Arthur N.", "" ], [ "Yuryev", "prepared for publication by V. A.", "" ] ]
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1402.5034
Lucas Paletta
Sigal Sina, Sarit Kraus, Avi Rosenfeld
Using the Crowd to Generate Content for Scenario-Based Serious-Games
null
null
null
IDGEI/2014/03
cs.AI cs.HC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In the last decade, scenario-based serious-games have become a main tool for learning new skills and capabilities. An important factor in the development of such systems is the overhead in time, cost and human resources to manually create the content for these scenarios. We focus on how to create content for scenarios in medical, military, commerce and gaming applications where maintaining the integrity and coherence of the content is integral for the system's success. To do so, we present an automatic method for generating content about everyday activities through combining computer science techniques with the crowd. We use the crowd in three basic ways: to capture a database of scenarios of everyday activities, to generate a database of likely replacements for specific events within that scenario, and to evaluate the resulting scenarios. We found that the generated scenarios were rated as reliable and consistent by the crowd when compared to the scenarios that were originally captured. We also compared the generated scenarios to those created by traditional planning techniques. We found that both methods were equally effective in generated reliable and consistent scenarios, yet the main advantages of our approach is that the content we generate is more varied and much easier to create. We have begun integrating this approach within a scenario-based training application for novice investigators within the law enforcement departments to improve their questioning skills.
[ { "created": "Thu, 20 Feb 2014 15:33:03 GMT", "version": "v1" } ]
2014-02-21
[ [ "Sina", "Sigal", "" ], [ "Kraus", "Sarit", "" ], [ "Rosenfeld", "Avi", "" ] ]
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1402.5035
Roi Baer
Daniel Neuhauser, Yi Gao, Christopher Arntsen, Cyrus Karshenas, Eran Rabani and Roi Baer
Breaking the theoretical scaling limit for predicting quasi-particle energies: The stochastic GW approach
null
null
10.1103/PhysRevLett.113.076402
null
cond-mat.mes-hall physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We develop a formalism to calculate the quasi-particle energy within the GW many-body perturbation correction to the density functional theory (DFT). The occupied and virtual orbitals of the Kohn-Sham (KS) Hamiltonian are replaced by stochastic orbitals used to evaluate the Green function, the polarization potential, and thereby the GW self-energy. The stochastic GW (sGW) relies on novel theoretical concepts such as stochastic time-dependent Hartree propagation, stochastic matrix compression and spatial/temporal stochastic decoupling techniques. Beyond the theoretical interest, the formalism enables linear scaling GW calculations breaking the theoretical scaling limit for GW as well as circumventing the need for energy cutoff approximations. We illustrate the method for silicon nanocrystals of varying sizes with over 3000 electrons.
[ { "created": "Thu, 20 Feb 2014 15:34:44 GMT", "version": "v1" }, { "created": "Wed, 28 May 2014 18:56:08 GMT", "version": "v2" } ]
2015-06-18
[ [ "Neuhauser", "Daniel", "" ], [ "Gao", "Yi", "" ], [ "Arntsen", "Christopher", "" ], [ "Karshenas", "Cyrus", "" ], [ "Rabani", "Eran", "" ], [ "Baer", "Roi", "" ] ]
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1402.5036
Carlos P. Herrero
Carlos P. Herrero
Structural characterization of ice polymorphs from self-avoiding walks
8 pages, 6 figures, 2 tables
null
10.1016/j.chemphys.2014.05.015
null
physics.chem-ph cond-mat.mtrl-sci cond-mat.stat-mech
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Topological properties of crystalline ice structures are studied by means of self-avoiding walks on their H-bond networks. The number of self-avoiding walks, C_n, for eight ice polymorphs has been obtained by direct enumeration up to walk length n = 27. This has allowed us to determine the `connective constant' or effective coordination number `mu' of these structures as the limit of the ratio C_n/C_{n-1} for large n. This structure-dependent parameter `mu' is related with other topological characteristics of ice polymorphs, such as the mean and minimum ring size, or the topological density of network sites. A correlation between the connective constant and the configurational entropy of hydrogen-disordered ice structures is discussed.
[ { "created": "Thu, 20 Feb 2014 15:36:25 GMT", "version": "v1" } ]
2015-06-18
[ [ "Herrero", "Carlos P.", "" ] ]
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1402.5037
Lucas Paletta
Ian Dunwell, Panagiotis Petridis, Petros Lameras, Maurice Hendrix, and Stella Doukianou, Mark Gaved
Assessing the Reach and Impact of Game-Based Learning Approaches to Cultural Competency and Behavioural Change
null
null
null
IDGEI/2014/08
cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
As digital games continue to be explored as solutions to educational and behavioural challenges, the need for evaluation methodologies which support both the unique nature of the format and the need for comparison with other approaches continues to increase. In this workshop paper, a range of challenges are described related specifically to the case of cultural learning using digital games, in terms of how it may best be assessed, understood, and sustained through an iterative process supported by research. An evaluation framework is proposed, identifying metrics for reach and impact and their associated challenges, as well as presenting ethical considerations and the means to utilize evaluation outcomes within an iterative cycle, and to provide feedback to learners. Presenting as a case study a serious game from the Mobile Assistance for Social Inclusion and Empowerment of Immigrants with Persuasive Learning Technologies and Social Networks (MASELTOV) project, the use of the framework in the context of an integrative project is discussed, with emphasis on the need to view game-based learning as a blended component of the cultural learning process, rather than a standalone solution. The particular case of mobile gaming is also considered within this case study, providing a platform by which to deliver and update content in response to evaluation outcomes. Discussion reflects upon the general challenges related to the assessment of cultural learning, and behavioural change in more general terms, suggesting future work should address the need to provide sustainable, research-driven platforms for game-based learning content.
[ { "created": "Thu, 20 Feb 2014 15:37:23 GMT", "version": "v1" } ]
2014-02-21
[ [ "Dunwell", "Ian", "" ], [ "Petridis", "Panagiotis", "" ], [ "Lameras", "Petros", "" ], [ "Hendrix", "Maurice", "" ], [ "Doukianou", "Stella", "" ], [ "Gaved", "Mark", "" ] ]
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1402.5039
Lucas Paletta
Hazael Jones, Nicolas Sabouret, Ionut Damian, Tobias Baur, Elisabeth Andr\'e, Ka\'ska Porayska-Pomsta and Paola Rizzo
Interpreting social cues to generate credible affective reactions of virtual job interviewers
null
null
null
IDGEI/2014/06
cs.AI cs.CY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we describe a mechanism of generating credible affective reactions in a virtual recruiter during an interaction with a user. This is done using communicative performance computation based on the behaviours of the user as detected by a recognition module. The proposed software pipeline is part of the TARDIS system which aims to aid young job seekers in acquiring job interview related social skills. In this context, our system enables the virtual recruiter to realistically adapt and react to the user in real-time.
[ { "created": "Thu, 20 Feb 2014 15:38:43 GMT", "version": "v1" }, { "created": "Tue, 25 Feb 2014 11:04:53 GMT", "version": "v2" } ]
2014-02-26
[ [ "Jones", "Hazael", "" ], [ "Sabouret", "Nicolas", "" ], [ "Damian", "Ionut", "" ], [ "Baur", "Tobias", "" ], [ "André", "Elisabeth", "" ], [ "Porayska-Pomsta", "Kaśka", "" ], [ "Rizzo", "Paola", "" ] ]
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1402.5043
Lucas Paletta
Marwen Belkaid, Nicolas Sabouret
A logical model of Theory of Mind for virtual agents in the context of job interview simulation
null
null
null
IDGEI/2014/10
cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Job interview simulation with a virtual agents aims at improving people's social skills and supporting professional inclusion. In such simulators, the virtual agent must be capable of representing and reasoning about the user's mental state based on social cues that inform the system about his/her affects and social attitude. In this paper, we propose a formal model of Theory of Mind (ToM) for virtual agent in the context of human-agent interaction that focuses on the affective dimension. It relies on a hybrid ToM that combines the two major paradigms of the domain. Our framework is based on modal logic and inference rules about the mental states, emotions and social relations of both actors. Finally, we present preliminary results regarding the impact of such a model on natural interaction in the context of job interviews simulation.
[ { "created": "Thu, 20 Feb 2014 15:40:08 GMT", "version": "v1" } ]
2014-02-21
[ [ "Belkaid", "Marwen", "" ], [ "Sabouret", "Nicolas", "" ] ]
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1402.5045
Lucas Paletta
Nicolas Sabouret, Haza\"el Jones, Magalie Ochs, Mathieu Chollet, Catherine Pelachaud
Expressing social attitudes in virtual agents for social training games
null
null
null
IDGEI/2014/11
cs.HC cs.AI cs.CY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The use of virtual agents in social coaching has increased rapidly in the last decade. In order to train the user in different situations than can occur in real life, the virtual agent should be able to express different social attitudes. In this paper, we propose a model of social attitudes that enables a virtual agent to reason on the appropriate social attitude to express during the interaction with a user given the course of the interaction, but also the emotions, mood and personality of the agent. Moreover, the model enables the virtual agent to display its social attitude through its non-verbal behaviour. The proposed model has been developed in the context of job interview simulation. The methodology used to develop such a model combined a theoretical and an empirical approach. Indeed, the model is based both on the literature in Human and Social Sciences on social attitudes but also on the analysis of an audiovisual corpus of job interviews and on post-hoc interviews with the recruiters on their expressed attitudes during the job interview.
[ { "created": "Thu, 20 Feb 2014 15:41:26 GMT", "version": "v1" } ]
2014-02-21
[ [ "Sabouret", "Nicolas", "" ], [ "Jones", "Hazaël", "" ], [ "Ochs", "Magalie", "" ], [ "Chollet", "Mathieu", "" ], [ "Pelachaud", "Catherine", "" ] ]
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1402.5047
Lucas Paletta
Stefano Piana, Alessandra Staglian\`o, Francesca Odone, Alessandro Verri, Antonio Camurri
Real-time Automatic Emotion Recognition from Body Gestures
null
null
null
IDGEI/2014/02
cs.HC cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Although psychological research indicates that bodily expressions convey important affective information, to date research in emotion recognition focused mainly on facial expression or voice analysis. In this paper we propose an approach to realtime automatic emotion recognition from body movements. A set of postural, kinematic, and geometrical features are extracted from sequences 3D skeletons and fed to a multi-class SVM classifier. The proposed method has been assessed on data acquired through two different systems: a professionalgrade optical motion capture system, and Microsoft Kinect. The system has been assessed on a "six emotions" recognition problem, and using a leave-one-subject-out cross validation strategy, reached an overall recognition rate of 61.3% which is very close to the recognition rate of 61.9% obtained by human observers. To provide further testing of the system, two games were developed, where one or two users have to interact to understand and express emotions with their body.
[ { "created": "Thu, 20 Feb 2014 15:42:32 GMT", "version": "v1" } ]
2014-02-21
[ [ "Piana", "Stefano", "" ], [ "Staglianò", "Alessandra", "" ], [ "Odone", "Francesca", "" ], [ "Verri", "Alessandro", "" ], [ "Camurri", "Antonio", "" ] ]
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null
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1402.5051
Eran Iceland
Eran Iceland and Alex Samorodnitsky
On Coset Leader Graphs of LDPC Codes
null
null
null
null
cs.IT cs.DM math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Our main technical result is that, in the coset leader graph of a linear binary code of block length n, the metric balls spanned by constant-weight vectors grow exponentially slower than those in $\{0,1\}^n$. Following the approach of Friedman and Tillich (2006), we use this fact to improve on the first linear programming bound on the rate of LDPC codes, as the function of their minimal distance. This improvement, combined with the techniques of Ben-Haim and Lytsin (2006), improves the rate vs distance bounds for LDPC codes in a significant sub-range of relative distances.
[ { "created": "Thu, 20 Feb 2014 15:49:49 GMT", "version": "v1" }, { "created": "Tue, 16 Dec 2014 19:04:49 GMT", "version": "v2" } ]
2014-12-17
[ [ "Iceland", "Eran", "" ], [ "Samorodnitsky", "Alex", "" ] ]
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1402.5052
Xin Liu
Xin Liu, Zaiwen Wen, Xiao Wang, Michael Ulbrich and Yaxiang Yuan
On the Analysis of the Discretized Kohn-Sham Density Functional Theory
29 pages
null
null
null
physics.comp-ph math.NA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we study a few theoretical issues in the discretized Kohn-Sham (KS) density functional theory (DFT). The equivalence between either a local or global minimizer of the KS total energy minimization problem and the solution to the KS equation is established under certain assumptions. The nonzero charge densities of a strong local minimizer are shown to be bounded below by a positive constant uniformly. We analyze the self-consistent field (SCF) iteration by formulating the KS equation as a fixed point map with respect to the potential. The Jacobian of these fixed point maps is derived explicitly. Both global and local convergence of the simple mixing scheme can be established if the gap between the occupied states and unoccupied states is sufficiently large. This assumption can be relaxed if the charge density is computed using the Fermi-Dirac distribution and it is not required if there is no exchange correlation functional in the total energy functional. Although our assumption on the gap is very stringent and is almost never satisfied in reality, our analysis is still valuable for a better understanding of the KS minimization problem, the KS equation and the SCF iteration.
[ { "created": "Thu, 20 Feb 2014 15:52:00 GMT", "version": "v1" } ]
2014-02-21
[ [ "Liu", "Xin", "" ], [ "Wen", "Zaiwen", "" ], [ "Wang", "Xiao", "" ], [ "Ulbrich", "Michael", "" ], [ "Yuan", "Yaxiang", "" ] ]
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1402.5059
Vaughan Thomas
Vaughan L. Thomas and Binh K. Lieu and Mihailo R. Jovanovi\'c and Brian Farell and Petros Ioannou and Dennice F. Gayme
Self-sustaining turbulence in a restricted nonlinear model of plane Couette flow
19 Pages, 7 Figures, 14 subfigures
null
10.1063/1.4898159
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper demonstrates the maintenance of self-sustaining turbulence in a restricted nonlinear (RNL) model of plane Couette flow. The RNL system is derived directly from the Navier Stokes equations and permits computationally tractable studies of the dynamical system obtained using stochastic structural stability theory (S3T), which is a second order approximation of the statistical state dynamics of the flow. The RNL model shares the dynamical restrictions of the S3T model but can be easily implemented through reducing a DNS code to the equations governing the RNL system. Comparisons of turbulence arising from DNS and RNL simulations demonstrate that the RNL system supports self-sustaining turbulence with a mean flow as well as structural and dynamical features that are consistent with DNS. These results demonstrate that the simplified RNL/S3T system captures fundamental aspects of fully developed turbulence in wall-bounded shear flows and motivates use of the RNL/S3T system for further study of wall turbulence.
[ { "created": "Thu, 20 Feb 2014 16:30:44 GMT", "version": "v1" } ]
2015-06-18
[ [ "Thomas", "Vaughan L.", "" ], [ "Lieu", "Binh K.", "" ], [ "Jovanović", "Mihailo R.", "" ], [ "Farell", "Brian", "" ], [ "Ioannou", "Petros", "" ], [ "Gayme", "Dennice F.", "" ] ]
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1402.5064
Elliot Kaplan
E. J. Kaplan
On the saturation of non-axisymmetric instabilites of magnetized spherical Couette flow
10 pages, 9 figures
Phys. Rev. E 89, 063016 (2014)
10.1103/PhysRevE.89.063016
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We numerically investigate the saturation of the hydromagnetic instabilities of a magnetized spherical Couette flow. Previous simulations [Hollerbach, 2009] demonstrated region where the axisymmetric flow, calculated from a 2-D simulation, was linearly unstable to nonaxisymmetric perturbations. Full, nonlinear, 3d simulations [Hollerbach 2009, Travnikov 2011] showed that the saturated state would consist only of harmonics of one azimuthal wave number, though there were bifurcations and transitions as nondimensional parameters (Re, Ha) were varied. Here, the energy transfer between different aziumthal modes is formulated as a network. This demonstrates a mechanism or the saturation of one mode and for the suppression of other unstable modes. A given mode grows by extracting energy from the axisymmetric flow, and then saturates as the energy transfer to its second harmonic equals this inflow. At the same time, this mode suppresses other unstable modes by facilitating an energy transfer to linearly stable modes.
[ { "created": "Thu, 20 Feb 2014 16:43:12 GMT", "version": "v1" }, { "created": "Mon, 5 May 2014 08:46:46 GMT", "version": "v2" } ]
2014-07-02
[ [ "Kaplan", "E. J.", "" ] ]
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1402.5069
Imre Ferenc Barna Dr.
Imre Ferenc Barna and Attila Rikard Imre
Theoretical Study of Steam Condensation Induced Water Hammer Phenomena in Horizontal Pipeline
10 pages, 3 figures, 1 table submitted to Experimental Thermal and Fluid Science
Kerntechnik 80, (2015) 5
10.3139/124.110537
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We investigate steam condensation induced water hammer (CIWH) phenomena and present new theoretical results. We use the WAHA3 model based on two-phase flow six first-order partial differential equations that present one dimensional, surface averaged mass, momentum and energy balances. A second order accurate high-resolution shock-capturing numerical scheme was applied with different kind of limiters in the numerical calculations. The applied two-fluid model shows some similarities to Relap5 which is widely used in the nuclear industry to simulate nuclear power plant accidents. This model was validated with different CIWH experiments which were performed in the PMK-2 facility, which is a full-pressure thermo-hydraulic model of the nuclear power plant of VVER-440/312 type in the Energy Research Center of the Hungarian Academy of Sciences in Budapest and in the Rosa facility in Japan. In our recent study we show the first part of a planned large database which will give us the upper and lower flooding mass flow rates for various pipe geometries where CIWH can happen. Such a reliable database would be a great help for future reactor constructions and scheming.
[ { "created": "Thu, 20 Feb 2014 16:48:04 GMT", "version": "v1" } ]
2017-01-09
[ [ "Barna", "Imre Ferenc", "" ], [ "Imre", "Attila Rikard", "" ] ]
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1402.5073
Xiangrong Zeng
Xiangrong Zeng and M\'ario A. T. Figueiredo
Exploiting Two-Dimensional Group Sparsity in 1-Bit Compressive Sensing
RecPad 2013, Lisbon, Portugal
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null
null
cs.CV cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose a new approach, {\it two-dimensional fused binary compressive sensing} (2DFBCS) to recover 2D sparse piece-wise signals from 1-bit measurements, exploiting 2D group sparsity for 1-bit compressive sensing recovery. The proposed method is a modified 2D version of the previous {\it binary iterative hard thresholding} (2DBIHT) algorithm, where the objective function includes a 2D one-sided $\ell_1$ (or $\ell_2$) penalty function encouraging agreement with the observed data, an indicator function of $K$-sparsity, and a total variation (TV) or modified TV (MTV) constraint. The subgradient of the 2D one-sided $\ell_1$ (or $\ell_2$) penalty and the projection onto the $K$-sparsity and TV or MTV constraint can be computed efficiently, allowing the appliaction of algorithms of the {\it forward-backward splitting} (a.k.a. {\it iterative shrinkage-thresholding}) family. Experiments on the recovery of 2D sparse piece-wise smooth signals show that the proposed approach is able to take advantage of the piece-wise smoothness of the original signal, achieving more accurate recovery than 2DBIHT. More specifically, 2DFBCS with the MTV and the $\ell_2$ penalty performs best amongst the algorithms tested.
[ { "created": "Thu, 20 Feb 2014 17:05:59 GMT", "version": "v1" }, { "created": "Fri, 21 Feb 2014 09:34:01 GMT", "version": "v2" } ]
2014-02-24
[ [ "Zeng", "Xiangrong", "" ], [ "Figueiredo", "Mário A. T.", "" ] ]
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1402.5074
Xiangrong Zeng
Xiangrong Zeng and M\'ario A. T. Figueiredo
Binary Fused Compressive Sensing: 1-Bit Compressive Sensing meets Group Sparsity
Conf. on Telecommunications - ConfTele, Castelo Branco, Portugal, Vol. 1, pp. 65 - 68, May, 2013
null
null
null
cs.CV cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose a new method, {\it binary fused compressive sensing} (BFCS), to recover sparse piece-wise smooth signals from 1-bit compressive measurements. The proposed algorithm is a modification of the previous {\it binary iterative hard thresholding} (BIHT) algorithm, where, in addition to the sparsity constraint, the total-variation of the recovered signal is upper constrained. As in BIHT, the data term of the objective function is an one-sided $\ell_1$ (or $\ell_2$) norm. Experiments on the recovery of sparse piece-wise smooth signals show that the proposed algorithm is able to take advantage of the piece-wise smoothness of the original signal, achieving more accurate recovery than BIHT.
[ { "created": "Thu, 20 Feb 2014 17:06:15 GMT", "version": "v1" } ]
2014-02-21
[ [ "Zeng", "Xiangrong", "" ], [ "Figueiredo", "Mário A. T.", "" ] ]
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1402.5076
Xiangrong Zeng
Xiangrong Zeng and M\'ario A. T. Figueiredo
Robust Binary Fused Compressive Sensing using Adaptive Outlier Pursuit
Accepted by ICASSP 2014
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null
null
cs.CV cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose a new method, {\it robust binary fused compressive sensing} (RoBFCS), to recover sparse piece-wise smooth signals from 1-bit compressive measurements. The proposed method is a modification of our previous {\it binary fused compressive sensing} (BFCS) algorithm, which is based on the {\it binary iterative hard thresholding} (BIHT) algorithm. As in BIHT, the data term of the objective function is a one-sided $\ell_1$ (or $\ell_2$) norm. Experiments show that the proposed algorithm is able to take advantage of the piece-wise smoothness of the original signal and detect sign flips and correct them, achieving more accurate recovery than BFCS and BIHT.
[ { "created": "Thu, 20 Feb 2014 17:07:23 GMT", "version": "v1" }, { "created": "Thu, 20 Mar 2014 11:11:45 GMT", "version": "v2" } ]
2014-03-21
[ [ "Zeng", "Xiangrong", "" ], [ "Figueiredo", "Mário A. T.", "" ] ]
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1402.5077
Xiangrong Zeng
Xiangrong Zeng and M\'ario A. T. Figueiredo
Group-sparse Matrix Recovery
ICASSP 2014
null
null
null
cs.LG cs.CV stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We apply the OSCAR (octagonal selection and clustering algorithms for regression) in recovering group-sparse matrices (two-dimensional---2D---arrays) from compressive measurements. We propose a 2D version of OSCAR (2OSCAR) consisting of the $\ell_1$ norm and the pair-wise $\ell_{\infty}$ norm, which is convex but non-differentiable. We show that the proximity operator of 2OSCAR can be computed based on that of OSCAR. The 2OSCAR problem can thus be efficiently solved by state-of-the-art proximal splitting algorithms. Experiments on group-sparse 2D array recovery show that 2OSCAR regularization solved by the SpaRSA algorithm is the fastest choice, while the PADMM algorithm (with debiasing) yields the most accurate results.
[ { "created": "Thu, 20 Feb 2014 17:08:34 GMT", "version": "v1" } ]
2014-02-21
[ [ "Zeng", "Xiangrong", "" ], [ "Figueiredo", "Mário A. T.", "" ] ]
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1402.5078
Kri\v{s}j\=anis Pr\=usis
Andris Ambainis and Kri\v{s}j\=anis Pr\=usis
A Tight Lower Bound on Certificate Complexity in Terms of Block Sensitivity and Sensitivity
12 pages
null
10.1007/978-3-662-44465-8_4
null
cs.CC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Sensitivity, certificate complexity and block sensitivity are widely used Boolean function complexity measures. A longstanding open problem, proposed by Nisan and Szegedy, is whether sensitivity and block sensitivity are polynomially related. Motivated by the constructions of functions which achieve the largest known separations, we study the relation between 1-certificate complexity and 0-sensitivity and 0-block sensitivity. Previously the best known lower bound was $C_1(f)\geq \frac{bs_0(f)}{2 s_0(f)}$, achieved by Kenyon and Kutin. We improve this to $C_1(f)\geq \frac{3 bs_0(f)}{2 s_0(f)}$. While this improvement is only by a constant factor, this is quite important, as it precludes achieving a superquadratic separation between $bs(f)$ and $s(f)$ by iterating functions which reach this bound. In addition, this bound is tight, as it matches the construction of Ambainis and Sun up to an additive constant.
[ { "created": "Thu, 20 Feb 2014 17:16:23 GMT", "version": "v1" }, { "created": "Thu, 31 Jul 2014 11:55:55 GMT", "version": "v2" } ]
2015-03-27
[ [ "Ambainis", "Andris", "" ], [ "Prūsis", "Krišjānis", "" ] ]
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1402.5083
Bernard Meehan
B.T. Meehan, J.H.J. Niederhaus
Fully Three-dimensional Simulation and Modeling of a Dense Plasma Focus
null
null
null
null
physics.plasm-ph
http://creativecommons.org/licenses/publicdomain/
A Dense Plasma Focus (DPF) is a pulsed-power machine that electromagnetically accelerates and cylindrically compresses a shocked plasma in a Z-pinch. The pinch results in a brief (about 100 nanosecond) pulse of X-rays, and, for some working gases, also a pulse of neutrons. A great deal of experimental research has been done into the physics of DPF reactions, and there exist mathematical models describing its behavior during the different time phases of the reaction. Two of the phases, known as the inverse pinch and the rundown, are approximately governed by magnetohydrodynamics, and there are a number of well-established codes for simulating these phases in two dimensions or in three dimensions under the assumption of axial symmetry. There has been little success, however, in developing fully three-dimensional simulations. In this work we present three-dimensional simulations of DPF reactions and demonstrate that 3D simulations predict qualitatively and quantitatively different behavior than their 2D counterparts. One of the most important quantities to predict is the time duration between the formation of the gas shock and Z-pinch, and the 3D simulations more faithfully represent experimental results for this time duration and are essential for accurate prediction of future experiments.
[ { "created": "Thu, 20 Feb 2014 17:32:21 GMT", "version": "v1" } ]
2014-02-21
[ [ "Meehan", "B. T.", "" ], [ "Niederhaus", "J. H. J.", "" ] ]
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1402.5086
Aravindh Krishnamoorthy
Aravindh Krishnamoorthy
Symmetric QR Algorithm with Permutations
null
null
null
null
cs.NA cs.MS math.NA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we present the QR Algorithm with Permutations that shows an improved convergence rate compared to the classical QR algorithm. We determine a bound for performance based on best instantaneous convergence, and develop low complexity methods for computing the permutation matrices at every iteration. We use simulations to verify the improvement, and to compare the performance of proposed algorithms to the classical QR algorithm.
[ { "created": "Thu, 20 Feb 2014 17:34:49 GMT", "version": "v1" } ]
2014-02-21
[ [ "Krishnamoorthy", "Aravindh", "" ] ]
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1402.5093
Lorenzo Lodi
Lorenzo Lodi, Oleg L. Polyansky, Jonathan Tennyson, Alexander Alijah, Nikolai F. Zobov
QED correction for H$_3^+$
null
Physical Review A, Volume: 89 Article Number: 032505 (2014)
10.1103/PhysRevA.89.032505
null
physics.chem-ph astro-ph.SR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A quantum electrodynamics (QED) correction surface for the simplest polyatomic and polyelectronic system H$_3^+$ is computed using an approximate procedure. This surface is used to calculate the shifts to vibration-rotation energy levels due to QED; such shifts have a magnitude of up to 0.25 cm$^{-1}$ for vibrational levels up to 15~000 cm$^{-1}$ and are expected to have an accuracy of about 0.02 cm$^{-1}$. Combining the new H$_3^+$ QED correction surface with existing highly accurate Born-Oppenheimer (BO), relativistic and adiabatic components suggests that deviations of the resulting {\it ab initio} energy levels from observed ones are largely due to non-adiabatic effects.
[ { "created": "Thu, 20 Feb 2014 18:22:40 GMT", "version": "v1" } ]
2014-06-27
[ [ "Lodi", "Lorenzo", "" ], [ "Polyansky", "Oleg L.", "" ], [ "Tennyson", "Jonathan", "" ], [ "Alijah", "Alexander", "" ], [ "Zobov", "Nikolai F.", "" ] ]
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1402.5106
Marco Ornigotti Dr.
Marco Ornigotti and Andrea Aiello
Generalized Bessel beams with two indices
null
null
null
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We report on a new class of exact solutions of the scalar Helmholtz equation obtained by carefully engineering the form of the angular spectrum of a Bessel beam. We consider in particular the case in which the angular spectrum of such generalized beams has, in the paraxial zone, the same radial structure as Laguerre-Gaussian beams. We investigate the form of these new beams as well as their peculiar propagation properties.
[ { "created": "Thu, 20 Feb 2014 19:12:25 GMT", "version": "v1" } ]
2014-02-21
[ [ "Ornigotti", "Marco", "" ], [ "Aiello", "Andrea", "" ] ]
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1402.5108
Jayme Vicente De Luca
Daniel C\^amara de Souza and Jayme De Luca
Solutions of the Wheeler-Feynman equations with discontinuous velocities
9 pages, 8 figures
null
10.1063/1.4905201
null
physics.class-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We generalize Wheeler-Feynman electrodynamics with a variational boundary-value problem with past and future boundary segments that can include velocity discontinuity points. Critical-point trajectories must satisfy the Euler-Lagrange equations of the action functional, which are neutral-differential delay equations of motion (the Wheeler-Feynman equations of motion). At velocity discontinuity points, critical-point orbits must satisfy the Weierstrass-Erdmann conditions of continuity of partial momenta and partial energies. We study a special class of boundary data having the shortest time-separation between boundary segments, for which case the Wheeler-Feynman equations reduce to a two-point boundary problem for an ordinary differential equation. For this simple case we prove that the extended variational problem has solutions with discontinuous velocities. We construct a numerical method to solve the Wheeler-Feynman equations together with the Weierstrass-Erdmann conditions and calculate some numerical orbits with discontinuous velocities.
[ { "created": "Thu, 20 Feb 2014 19:21:43 GMT", "version": "v1" }, { "created": "Sat, 8 Mar 2014 20:53:43 GMT", "version": "v2" } ]
2019-04-17
[ [ "de Souza", "Daniel Câmara", "" ], [ "De Luca", "Jayme", "" ] ]
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1402.5110
Laszlo Gyongyosi Dr.
Laszlo Gyongyosi
Singular Layer Transmission for Continuous-Variable Quantum Key Distribution
48 pages, 9 figures
null
null
null
quant-ph cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We develop a singular layer transmission model for continuous-variable quantum key distribution (CVQKD). In CVQKD, the transmit information is carried by continuous-variable (CV) quantum states, particularly by Gaussian random distributed position and momentum quadratures. The reliable transmission of the quadrature components over a noisy link is a cornerstone of CVQKD protocols. The proposed singular layer uses the singular value decomposition of the Gaussian quantum channel, which yields an additional degree of freedom for the phase space transmission. This additional degree of freedom can further be exploited in a multiple-access scenario. The singular layer defines the eigenchannels of the Gaussian physical link, which can be used for the simultaneous reliable transmission of multiple user data streams. Our transmission model also includes the singular interference avoider (SIA) precoding scheme. The proposed SIA precoding scheme prevents the eigenchannel interference to reach an optimal transmission over a Gaussian link. We demonstrate the results through the adaptive multicarrier quadrature division-multiuser quadrature allocation (AMQD-MQA) CVQKD multiple-access scheme. We define the singular model of AMQD-MQA and characterize the properties of the eigenchannel interference. We propose the SIA precoding of Gaussian random quadratures and the optimal decoding at the receiver. We show a random phase space constellation scheme for the Gaussian sub-channels. The singular layer transmission provides improved simultaneous transmission rates for the users with unconditional security in a multiple-access scenario, particularly in crucial low signal-to-noise ratio regimes.
[ { "created": "Thu, 20 Feb 2014 19:30:36 GMT", "version": "v1" } ]
2014-02-21
[ [ "Gyongyosi", "Laszlo", "" ] ]
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1402.5114
Shafi'i Muhammad Abdulhamid Mr
Shafii Muhammad Abdulhamid, Hassan Abdulazeez, Ochoche Abraham and Umar Mohammed
Analysing Membership Profile Privacy Issues in Online Social Networks
20 pages
IUP Journal of Information Technology 7 (3), 2011
null
null
cs.SI cs.SY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A social networking site is an on-line service that attracts a society of subscribers and provides such users with a multiplicity of tools for distribution personal data and creating subscribers generated content directed to a given users interest and personal life. Operators of online social networks are gradually giving out potentially sensitive information about users and their relationships with advertisers, application developers, and data-mining researchers. Some criminals too uses information gathered through membership profile in social networks to break peoples PINs and passwords. In this paper, we looked at the field structure of membership profiles in ten popular social networking sites. We also analysed how private information can easily be made public in such sites. At the end recommendations and countermeasures were made on how to safe guard subscribers personal data.
[ { "created": "Tue, 18 Feb 2014 23:54:40 GMT", "version": "v1" } ]
2014-02-21
[ [ "Abdulhamid", "Shafii Muhammad", "" ], [ "Abdulazeez", "Hassan", "" ], [ "Abraham", "Ochoche", "" ], [ "Mohammed", "Umar", "" ] ]
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1402.5121
Daniel S. Katz
Daniel S. Katz
Challenges in Selecting Software to be Reused
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cs.SE
http://creativecommons.org/licenses/by/3.0/
This is a position paper for Sharing, Re-Use and Circulation of Resources in Cooperative Scientific Work, a CSCW'14 workshop. It discusses the role of software in NSF's CIF21 vision and the SI2 program, which is intended to support that goal. SI2 primarily supports software projects that are proposed in response to solicitations, and some of the criteria used by the peer-reviewers and by NSF in evaluating these projects depend on predicting scientific impact. This paper discusses some ideas on how the prediction of scientific impact can be improved.
[ { "created": "Tue, 18 Feb 2014 13:42:21 GMT", "version": "v1" }, { "created": "Wed, 30 Apr 2014 14:39:53 GMT", "version": "v2" }, { "created": "Mon, 27 Oct 2014 13:08:47 GMT", "version": "v3" } ]
2014-10-28
[ [ "Katz", "Daniel S.", "" ] ]
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1402.5123
Abdelmalek Amine
Abdelmalek Amine, Reda Mohamed Hamou, Michel Simonet
Detecting Opinions in Tweets
13 pages, 2 figures
International Journal Of Data Mining And Emerging Technologies, Year : 2013, Volume : 3, Issue : 1 First page : ( 23) Last page : ( 32) Print ISSN : 2249-3212. Online ISSN : 2249-3220
10.5958/j.2249-3220.3.1.004
null
cs.CL cs.SI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Given the incessant growth of documents describing the opinions of different people circulating on the web, including Web 2.0 has made it possible to give an opinion on any product in the net. In this paper, we examine the various opinions expressed in the tweets and classify them positive, negative or neutral by using the emoticons for the Bayesian method and adjectives and adverbs for the Turney's method
[ { "created": "Thu, 20 Feb 2014 20:15:18 GMT", "version": "v1" } ]
2014-02-21
[ [ "Amine", "Abdelmalek", "" ], [ "Hamou", "Reda Mohamed", "" ], [ "Simonet", "Michel", "" ] ]
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1402.5131
Hanie Sedghi
Hanie Sedghi and Anima Anandkumar and Edmond Jonckheere
Multi-Step Stochastic ADMM in High Dimensions: Applications to Sparse Optimization and Noisy Matrix Decomposition
appeared in Neural Information Processing Systems(NIPS) 2014. arXiv admin note: text overlap with arXiv:1207.4421 by other authors
null
null
null
cs.LG math.OC stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose an efficient ADMM method with guarantees for high-dimensional problems. We provide explicit bounds for the sparse optimization problem and the noisy matrix decomposition problem. For sparse optimization, we establish that the modified ADMM method has an optimal convergence rate of $\mathcal{O}(s\log d/T)$, where $s$ is the sparsity level, $d$ is the data dimension and $T$ is the number of steps. This matches with the minimax lower bounds for sparse estimation. For matrix decomposition into sparse and low rank components, we provide the first guarantees for any online method, and prove a convergence rate of $\tilde{\mathcal{O}}((s+r)\beta^2(p) /T) + \mathcal{O}(1/p)$ for a $p\times p$ matrix, where $s$ is the sparsity level, $r$ is the rank and $\Theta(\sqrt{p})\leq \beta(p)\leq \Theta(p)$. Our guarantees match the minimax lower bound with respect to $s,r$ and $T$. In addition, we match the minimax lower bound with respect to the matrix dimension $p$, i.e. $\beta(p)=\Theta(\sqrt{p})$, for many important statistical models including the independent noise model, the linear Bayesian network and the latent Gaussian graphical model under some conditions. Our ADMM method is based on epoch-based annealing and consists of inexpensive steps which involve projections on to simple norm balls. Experiments show that for both sparse optimization and matrix decomposition problems, our algorithm outperforms the state-of-the-art methods. In particular, we reach higher accuracy with same time complexity.
[ { "created": "Thu, 20 Feb 2014 20:48:10 GMT", "version": "v1" }, { "created": "Tue, 11 Mar 2014 00:15:42 GMT", "version": "v2" }, { "created": "Wed, 19 Mar 2014 09:42:26 GMT", "version": "v3" }, { "created": "Mon, 16 Jun 2014 03:53:05 GMT", "version": "v4" }, { "created": "Sun, 7 Dec 2014 03:36:03 GMT", "version": "v5" }, { "created": "Tue, 7 Jul 2015 00:13:55 GMT", "version": "v6" } ]
2015-07-08
[ [ "Sedghi", "Hanie", "" ], [ "Anandkumar", "Anima", "" ], [ "Jonckheere", "Edmond", "" ] ]
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Multi-Step Stochastic ADMM in High Dimensions: Applications to Sparse Optimization and Noisy Matrix Decomposition
http://arxiv.org/abs/1402.5131v6
http://arxiv.org/pdf/1402.5131v6.pdf
https://github.com/FanjieLUO/matlab
false
false
https://paperswithcode.com/paper/multi-step-stochastic-admm-in-high-dimensions
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1402.5138
Dieter Pfoser
Mahmuda Ahmed and Sophia Karagiorgou and Dieter Pfoser and Carola Wenk
A Comparison and Evaluation of Map Construction Algorithms
null
null
10.1007/s10707-014-0222-6
null
cs.CG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Map construction methods automatically produce and/or update road network datasets using vehicle tracking data. Enabled by the ubiquitous generation of georeferenced tracking data, there has been a recent surge in map construction algorithms coming from different computer science domains. A cross-comparison of the various algorithms is still very rare, since (i) algorithms and constructed maps are generally not publicly available and (ii) there is no standard approach to assess the result quality, given the lack of benchmark data and quantitative evaluation methods. This work represents a first comprehensive attempt to benchmark map construction algorithms. We provide an evaluation and comparison of seven algorithms using four datasets and four different evaluation measures. In addition to this comprehensive comparison, we make our datasets, source code of map construction algorithms and evaluation measures publicly available on mapconstruction.org. This site has been established as a repository for map con- struction data and algorithms and we invite other researchers to contribute by uploading code and benchmark data supporting their contributions to map construction algorithms.
[ { "created": "Wed, 19 Feb 2014 21:50:39 GMT", "version": "v1" }, { "created": "Thu, 12 Jun 2014 14:51:46 GMT", "version": "v2" } ]
2014-11-19
[ [ "Ahmed", "Mahmuda", "" ], [ "Karagiorgou", "Sophia", "" ], [ "Pfoser", "Dieter", "" ], [ "Wenk", "Carola", "" ] ]
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1402.5139
Jian-Jun Shu
Jian-Jun Shu and Graham Wilks
Heat transfer in the flow of a cold, two-dimensional draining sheet over a hot, horizontal cylinder
arXiv admin note: substantial text overlap with arXiv:1402.5014, arXiv:1402.4386
European Journal of Mechanics B-Fluids, Vol. 28, No. 1, pp. 185-190, 2009
10.1016/j.euromechflu.2008.04.001
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The paper considers heat transfer characteristics of thin film flow over a hot horizontal cylinder resulting from a cold vertical sheet of liquid falling onto the surface. The underlying physical features of the developing film thickness, velocity and temperature distributions have been illustrated by numerical solutions of high accuracy for large Reynolds numbers using the modified Keller box method. The solutions for film thickness distribution are good agreement with those obtained using the Pohlhausen integral momentum technique thus providing a basic confirmation of the validity of the results presented.
[ { "created": "Thu, 20 Feb 2014 15:18:22 GMT", "version": "v1" }, { "created": "Mon, 3 Mar 2014 13:22:45 GMT", "version": "v2" } ]
2014-03-04
[ [ "Shu", "Jian-Jun", "" ], [ "Wilks", "Graham", "" ] ]
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1402.5155
Marta Santos
M. D. Santos, S. N. Dorogovtsev, J. F. F. Mendes
Biased imitation in coupled evolutionary games in interdependent networks
20 pages, 8 figures
Scientific Reports 4, 4436 (2014)
10.1038/srep04436
null
physics.soc-ph q-bio.PE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We explore the evolutionary dynamics of two games - the Prisoner's Dilemma and the Snowdrift Game - played within distinct networks (layers) of interdependent networks. In these networks imitation and interaction between individuals of opposite layers is established through interlinks. We explore an update rule in which revision of strategies is a biased imitation process: individuals imitate neighbors from the same layer with probability p, and neighbors from the second layer with complementary probability 1 - p. We demonstrate that a small decrease of p from p = 1 (which corresponds to forbidding strategy transfer between layers) is sufficient to promote cooperation in the Prisoner's Dilemma subpopulation. This, on the other hand, is detrimental for cooperation in the Snowdrift Game subpopulation. We provide results of extensive computer simulations for the case in which layers are modelled as regular random networks, and support this study with analytical results for coupled well-mixed populations.
[ { "created": "Thu, 20 Feb 2014 21:54:05 GMT", "version": "v1" }, { "created": "Sat, 22 Mar 2014 11:29:21 GMT", "version": "v2" } ]
2014-04-10
[ [ "Santos", "M. D.", "" ], [ "Dorogovtsev", "S. N.", "" ], [ "Mendes", "J. F. F.", "" ] ]
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1402.5159
Yi-Hsieh Wang
Yi-Hsieh Wang and Brandon M. Anderson and Charles W. Clark
Spinor Bose-Einstein Condensates of Positronium
14 pages, 9 figures
Phys. Rev. A 89, 043624 (2014)
10.1103/PhysRevA.89.043624
null
cond-mat.quant-gas physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Bose-Einstein condensates (BECs) of positronium (Ps) have been of experimental and theoretical interest due to their potential application as the gain medium of a $\gamma$-ray laser. Ps BECs are intrinsically spinor due to the presence of ortho-positronium (o-Ps) and para-positronium (p-Ps), whose annihilation lifetimes differ by three orders of magnitude. In this paper, we study the spinor dynamics and annihilation processes in the p-Ps/o-Ps system using both solutions of the time-dependent Gross-Pitaevskii equations and a semiclassical rate-equation approach. The spinor interactions have an $O(4)$ symmetry which is broken to $SO(3)$ by an internal energy difference between o-Ps and p-Ps. For an initially unpolarized condensate, there is a threshold density of $\approx 10^{19}$ cm$^{-3}$ at which spin mixing between o-Ps and p-Ps occurs. Beyond this threshold, there are unstable spatial modes accompanied by spin mixing. To ensure a high production yield above the critical density, a careful choice of external field must be made to avoid the spin mixing instability.
[ { "created": "Thu, 20 Feb 2014 22:24:34 GMT", "version": "v1" }, { "created": "Mon, 13 Apr 2015 19:44:45 GMT", "version": "v2" } ]
2015-04-14
[ [ "Wang", "Yi-Hsieh", "" ], [ "Anderson", "Brandon M.", "" ], [ "Clark", "Charles W.", "" ] ]
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1402.5161
Roberto Rossi
Roberto Rossi and Steven Prestwich and S. Armagan Tarim
Statistical Constraints
null
Proceedings of the 21st European Conference on Artificial Intelligence, ECAI 2014, August 18-22, 2014, Prague, Czech Republic, IOS Press, Volume 263, pp. 777-782, 2014
10.3233/978-1-61499-419-0-777
null
cs.AI stat.ME
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We introduce statistical constraints, a declarative modelling tool that links statistics and constraint programming. We discuss two statistical constraints and some associated filtering algorithms. Finally, we illustrate applications to standard problems encountered in statistics and to a novel inspection scheduling problem in which the aim is to find inspection plans with desirable statistical properties.
[ { "created": "Thu, 20 Feb 2014 22:29:59 GMT", "version": "v1" }, { "created": "Tue, 25 Feb 2014 21:38:16 GMT", "version": "v2" }, { "created": "Fri, 28 Feb 2014 20:16:41 GMT", "version": "v3" }, { "created": "Sun, 1 Jun 2014 14:39:30 GMT", "version": "v4" }, { "created": "Thu, 14 Aug 2014 21:33:04 GMT", "version": "v5" } ]
2014-09-09
[ [ "Rossi", "Roberto", "" ], [ "Prestwich", "Steven", "" ], [ "Tarim", "S. Armagan", "" ] ]
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Statistical Constraints
http://arxiv.org/abs/1402.5161v5
http://arxiv.org/pdf/1402.5161v5.pdf
https://github.com/gwr3n/syat-choco
true
false
https://paperswithcode.com/paper/statistical-constraints
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1402.5164
Justin Thaler
Varun Kanade and Justin Thaler
Distribution-Independent Reliable Learning
20 pages
null
null
null
cs.LG cs.CC cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study several questions in the reliable agnostic learning framework of Kalai et al. (2009), which captures learning tasks in which one type of error is costlier than others. A positive reliable classifier is one that makes no false positive errors. The goal in the positive reliable agnostic framework is to output a hypothesis with the following properties: (i) its false positive error rate is at most $\epsilon$, (ii) its false negative error rate is at most $\epsilon$ more than that of the best positive reliable classifier from the class. A closely related notion is fully reliable agnostic learning, which considers partial classifiers that are allowed to predict "unknown" on some inputs. The best fully reliable partial classifier is one that makes no errors and minimizes the probability of predicting "unknown", and the goal in fully reliable learning is to output a hypothesis that is almost as good as the best fully reliable partial classifier from a class. For distribution-independent learning, the best known algorithms for PAC learning typically utilize polynomial threshold representations, while the state of the art agnostic learning algorithms use point-wise polynomial approximations. We show that one-sided polynomial approximations, an intermediate notion between polynomial threshold representations and point-wise polynomial approximations, suffice for learning in the reliable agnostic settings. We then show that majorities can be fully reliably learned and disjunctions of majorities can be positive reliably learned, through constructions of appropriate one-sided polynomial approximations. Our fully reliable algorithm for majorities provides the first evidence that fully reliable learning may be strictly easier than agnostic learning. Our algorithms also satisfy strong attribute-efficiency properties, and provide smooth tradeoffs between sample complexity and running time.
[ { "created": "Thu, 20 Feb 2014 22:41:39 GMT", "version": "v1" } ]
2014-02-25
[ [ "Kanade", "Varun", "" ], [ "Thaler", "Justin", "" ] ]
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1402.5165
Yakov Babichenko
Yakov Babichenko
Axiomatic Approach to Solutions of Games
null
null
null
null
cs.GT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider solutions of normal form games that are invariant under strategic equivalence. We consider additional properties that can be expected (or be desired) from a solution of a game, and we observe the following: - Even the weakest notion of individual rationality restricts the set of solutions to be equilibria. This observation holds for all types of solutions: in pure-strategies, in mixed strategies, and in correlated strategies where the corresponding notions of equilibria are pure-Nash, Nash and coarse-correlated. An action profile is (strict) simultaneous maximizer if it simultaneously globally (strictly) maximizes the payoffs of all players. - If we require that a simultaneous maximizer (if it exists) will be a solution, then the solution contains the set of pure Nash equilibria. - There is no solution for which a strict simultaneous maximizer (if it exists) is the unique solution.
[ { "created": "Thu, 20 Feb 2014 22:56:02 GMT", "version": "v1" } ]
2014-02-24
[ [ "Babichenko", "Yakov", "" ] ]
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1402.5172
Mingsheng Ying
Mingsheng Ying, Nengkun Yu and Yuan Feng
Alternation in Quantum Programming: From Superposition of Data to Superposition of Programs
arXiv admin note: substantial text overlap with arXiv:1209.4379
null
null
null
cs.PL cs.LO quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We extract a novel quantum programming paradigm - superposition of programs - from the design idea of a popular class of quantum algorithms, namely quantum walk-based algorithms. The generality of this paradigm is guaranteed by the universality of quantum walks as a computational model. A new quantum programming language QGCL is then proposed to support the paradigm of superposition of programs. This language can be seen as a quantum extension of Dijkstra's GCL (Guarded Command Language). Surprisingly, alternation in GCL splits into two different notions in the quantum setting: classical alternation (of quantum programs) and quantum alternation, with the latter being introduced in QGCL for the first time. Quantum alternation is the key program construct for realizing the paradigm of superposition of programs. The denotational semantics of QGCL are defined by introducing a new mathematical tool called the guarded composition of operator-valued functions. Then the weakest precondition semantics of QGCL can straightforwardly derived. Another very useful program construct in realizing the quantum programming paradigm of superposition of programs, called quantum choice, can be easily defined in terms of quantum alternation. The relation between quantum choices and probabilistic choices is clarified through defining the notion of local variables. We derive a family of algebraic laws for QGCL programs that can be used in program verification, transformations and compilation. The expressive power of QGCL is illustrated by several examples where various variants and generalizations of quantum walks are conveniently expressed using quantum alternation and quantum choice. We believe that quantum programming with quantum alternation and choice will play an important role in further exploiting the power of quantum computing.
[ { "created": "Thu, 20 Feb 2014 23:35:58 GMT", "version": "v1" } ]
2014-02-24
[ [ "Ying", "Mingsheng", "" ], [ "Yu", "Nengkun", "" ], [ "Feng", "Yuan", "" ] ]
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1402.5176
Ko-Jen Hsiao
Ko-Jen Hsiao, Jeff Calder, Alfred O. Hero III
Pareto-depth for Multiple-query Image Retrieval
null
null
10.1109/TIP.2014.2378057
null
cs.IR cs.LG stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Most content-based image retrieval systems consider either one single query, or multiple queries that include the same object or represent the same semantic information. In this paper we consider the content-based image retrieval problem for multiple query images corresponding to different image semantics. We propose a novel multiple-query information retrieval algorithm that combines the Pareto front method (PFM) with efficient manifold ranking (EMR). We show that our proposed algorithm outperforms state of the art multiple-query retrieval algorithms on real-world image databases. We attribute this performance improvement to concavity properties of the Pareto fronts, and prove a theoretical result that characterizes the asymptotic concavity of the fronts.
[ { "created": "Fri, 21 Feb 2014 00:42:48 GMT", "version": "v1" } ]
2015-06-18
[ [ "Hsiao", "Ko-Jen", "" ], [ "Calder", "Jeff", "" ], [ "Hero", "Alfred O.", "III" ] ]
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1402.5180
Majid Janzamin
Animashree Anandkumar and Rong Ge and Majid Janzamin
Guaranteed Non-Orthogonal Tensor Decomposition via Alternating Rank-$1$ Updates
We have added an additional sub-algorithm to remove the (approximate) residual error left after the tensor power iteration
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null
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cs.LG math.NA stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we provide local and global convergence guarantees for recovering CP (Candecomp/Parafac) tensor decomposition. The main step of the proposed algorithm is a simple alternating rank-$1$ update which is the alternating version of the tensor power iteration adapted for asymmetric tensors. Local convergence guarantees are established for third order tensors of rank $k$ in $d$ dimensions, when $k=o \bigl( d^{1.5} \bigr)$ and the tensor components are incoherent. Thus, we can recover overcomplete tensor decomposition. We also strengthen the results to global convergence guarantees under stricter rank condition $k \le \beta d$ (for arbitrary constant $\beta > 1$) through a simple initialization procedure where the algorithm is initialized by top singular vectors of random tensor slices. Furthermore, the approximate local convergence guarantees for $p$-th order tensors are also provided under rank condition $k=o \bigl( d^{p/2} \bigr)$. The guarantees also include tight perturbation analysis given noisy tensor.
[ { "created": "Fri, 21 Feb 2014 01:37:02 GMT", "version": "v1" }, { "created": "Mon, 16 Jun 2014 16:29:13 GMT", "version": "v2" }, { "created": "Sun, 3 Aug 2014 22:00:58 GMT", "version": "v3" }, { "created": "Wed, 4 Mar 2015 20:40:42 GMT", "version": "v4" } ]
2015-03-05
[ [ "Anandkumar", "Animashree", "" ], [ "Ge", "Rong", "" ], [ "Janzamin", "Majid", "" ] ]
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1402.5183
Ping Lu
Ping Lu, Yonghua Yan, Chaoqun Liu
Numerical Study on Mechanism of Multiple Rings Formation
null
null
null
null
physics.flu-dyn
http://creativecommons.org/licenses/by/3.0/
In this paper, the flow around each ring-like vortex is investigated by high order DNS including first sweep, first ejection, second sweep, second ejection, positive spike, momentum deficit, vortex shape, vortex location, strength of sweeps, etc. Meanwhile, the mechanism about formation of momentum deficit is deeply studied. A new mechanism on how the multiple rings are formed one by one found both by experiment and by DNS in late boundary layer transition is presented. It also reveals that the relation between streamwise vortex and spanvise vertex rings, and how the vorticity is transferred between them.
[ { "created": "Fri, 21 Feb 2014 01:54:54 GMT", "version": "v1" } ]
2014-02-24
[ [ "Lu", "Ping", "" ], [ "Yan", "Yonghua", "" ], [ "Liu", "Chaoqun", "" ] ]
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1402.5187
Nordin Zakaria
Chan-Yet Lai, Nordin Zakaria
Towards an Intelligent Framework for Pressure-based 3D Curve Drawing
This paper was rejected from GI 2014. Comment from the chief reviewer:All reviewers noted that the ideas behind this paper were promising, but felt that research was not quite sufficiently developed...Although all agreed that this idea is insightful and has the potential to lead to a valuable contribution,... the idea is not yet sufficiently developed to warrant publication
null
null
null
cs.HC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Pen pressure is an input channel typically available in tablet pen device. To date, little attention has been paid to the use of pressure in the domain of graphical interaction, its usage largely limited to drawing and painting program, typically for varying brush characteristic such as stroke width, opacity and color. In this paper, we explore the use of pressure in 3D curve drawing. The act of controlling pressure using pen, pencil and brush in real life appears effortless, but to mimic this natural ability to control pressure using a pressure sensitive pen in the realm of electronic medium is difficult. Previous pressure based interaction work have proposed various signal processing techniques to improve the accuracy in pressure control, but a one-for-all signal processing solution tend not to work for different curve types. We propose instead a framework which applies signal processing techniques tuned to individual curve type. A neural network classifier is used as a curve classifier. Based on the classification, a custom combination of signal processing techniques is then applied. Results obtained point to the feasibility and advantage of the approach.
[ { "created": "Fri, 21 Feb 2014 02:09:32 GMT", "version": "v1" } ]
2014-02-24
[ [ "Lai", "Chan-Yet", "" ], [ "Zakaria", "Nordin", "" ] ]
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1402.5188
Chao Wang
Chao Wang
Collision free autonomous navigation and formation building for non-holonomic ground robots
null
null
null
null
cs.RO math.OC
http://creativecommons.org/licenses/by/3.0/
The primary objective of a safe navigation algorithm is to guide the object from its current position to the target position while avoiding any collision with the en-route obstacles, and the appropriate obstacle avoidance strategies are the key factors to ensure safe navigation tasks in dynamic environments. In this report, three different obstacle avoidance strategies for safe navigation in dynamic environments have been presented. The biologically-inspired navigation algorithm (BINA) is efficient in terms of avoidance time. The equidistant based navigation algorithm (ENA) is able to achieve navigation task with in uncertain dynamic environments. The navigation algorithm algorithm based on an integrated environment representation (NAIER) allows the object to seek a safe path through obstacles in unknown dynamic environment in a human-like fashion. The performances and features of the proposed navigation algorithms are confirmed by extensive simulation results and experiments with a real non-holonomic mobile robot. The algorithms have been implemented on two real control systems: intelligent wheelchair and robotic hospital bed. The performance of the proposed algorithms with SAM and Flexbed demonstrate their capabilities to achieve navigation tasks in complicated real time scenarios. The proposed algorithms are easy to be implemented in real time and costly efficient. An extra study on networked multi-robots formation building algorithm is presented in this paper. A constructive and easy-to-implement decentralised control is proposed for a formation building of a group of random positioned objects. Furthermore, the problem of formation building with anonymous objects is addressed. This randomised decentralised navigation algorithm achieves the convergence to a desired configuration with probability 1.
[ { "created": "Fri, 21 Feb 2014 02:22:57 GMT", "version": "v1" } ]
2014-02-24
[ [ "Wang", "Chao", "" ] ]
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1402.5192
Wiroonsak Santipach
Wiroonsak Santipach, Kritsada Mamat, Ake Tonsirisittikun, Kaemmatat Jiravanstit
Power and Bit Allocation for Wireless OFDM Channels with Finite-Rate Feedback and Subcarrier Clustering
null
Kasetsart Journal (Natural Science), vol. 47, no. 6, pp. 898-908, Nov.-Dec. 2013
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The study investigated the allocation of transmission power and bits for a point-to-point orthogonal frequency-division multiplexing channel assuming perfect channel information at the receiver, but imperfect channel information at the transmitter. Channel information was quantized at the receiver and was sent back to the transmitter via a finite-rate feedback channel. Based on limited feedback from the receiver, the corresponding transmitter adapted the power level and/or modulation across subcarriers. To reduce the amount of feedback, subcarriers were partitioned into different clusters and an on/off threshold-based power allocation was applied to subcarrier clusters. In addition, two options were proposed to interpolate a channel frequency response from a set of quantized channel gains and apply the optimal water-filling allocation or a greedy bit allocation based on channel interpolation. Proposed schemes with finite feedback rates were shown to perform close to the optimal allocation without a feedback-rate constraint. In the numerical example, channel capacity decreased about 6% from the optimum when one bit of feedback per subcarrier was used.
[ { "created": "Fri, 21 Feb 2014 02:58:08 GMT", "version": "v1" } ]
2015-10-16
[ [ "Santipach", "Wiroonsak", "" ], [ "Mamat", "Kritsada", "" ], [ "Tonsirisittikun", "Ake", "" ], [ "Jiravanstit", "Kaemmatat", "" ] ]
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1402.5194
Rui Han
Rui Han, Xiaoyi Lu
On Big Data Benchmarking
7 pages, 4 figures, 2 tables, accepted in BPOE-04 (http://prof.ict.ac.cn/bpoe_4_asplos/)
null
null
null
cs.PF cs.DB
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Big data systems address the challenges of capturing, storing, managing, analyzing, and visualizing big data. Within this context, developing benchmarks to evaluate and compare big data systems has become an active topic for both research and industry communities. To date, most of the state-of-the-art big data benchmarks are designed for specific types of systems. Based on our experience, however, we argue that considering the complexity, diversity, and rapid evolution of big data systems, for the sake of fairness, big data benchmarks must include diversity of data and workloads. Given this motivation, in this paper, we first propose the key requirements and challenges in developing big data benchmarks from the perspectives of generating data with 4V properties (i.e. volume, velocity, variety and veracity) of big data, as well as generating tests with comprehensive workloads for big data systems. We then present the methodology on big data benchmarking designed to address these challenges. Next, the state-of-the-art are summarized and compared, following by our vision for future research directions.
[ { "created": "Fri, 21 Feb 2014 03:03:16 GMT", "version": "v1" } ]
2014-02-24
[ [ "Han", "Rui", "" ], [ "Lu", "Xiaoyi", "" ] ]
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1402.5196
Kensuke Nakanishi
Kensuke Nakanishi, Shinsuke Hara, Takahiro Matsuda, Kenichi Takizawa, Fumie Ono, and Ryu Miura
Synchronization-Free Delay Tomography Based on Compressed Sensing
null
null
null
null
cs.NI cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Delay tomography has so far burdened source and receiver measurement nodes in a network with two requirements such as path establishment and clock synchronization between them. In this letter, we focus on the clock synchronization problem in delay tomography and propose a synchronization-free delay tomography scheme. The proposed scheme selects a path between source and receiver measurement nodes as a reference path, which results in a loss of equation in a conventional delay tomography problem. However, by utilizing compressed sensing, the proposed scheme becomes robust to the loss. Simulation experiments confirm that the proposed scheme works comparable to a conventional delay tomography scheme in networks with no clock synchronization between source and receiver measurement nodes.
[ { "created": "Fri, 21 Feb 2014 03:33:24 GMT", "version": "v1" } ]
2014-02-24
[ [ "Nakanishi", "Kensuke", "" ], [ "Hara", "Shinsuke", "" ], [ "Matsuda", "Takahiro", "" ], [ "Takizawa", "Kenichi", "" ], [ "Ono", "Fumie", "" ], [ "Miura", "Ryu", "" ] ]
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1402.5205
Thilagavathi Jayamurugan
D. Thilagavathi, Antony Selvadoss Thanamani
A Survey on Dynamic Job Scheduling in Grid Environment Based on Heuristic Algorithms
6 Pages, 1 FiguerE, "Published with International Journal of Computer Trends and Technology (IJCTT)". arXiv admin note: contains excessive text overlap with other internet sources
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null
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cs.DC cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Computational Grids are a new trend in distributed computing systems. They allow the sharing of geographically distributed resources in an efficient way, extending the boundaries of what we perceive as distributed computing. Various sciences can benefit from the use of grids to solve CPU-intensive problems, creating potential benefits to the entire society. Job scheduling is an integrated part of parallel and distributed computing. It allows selecting correct match of resource for a particular job and thus increases the job throughput and utilization of resources. Job should be scheduled in an automatic way to make the system more reliable, accessible and less sensitive to subsystem failures. This paper provides a survey on various heuristic algorithms, used for scheduling in grid.
[ { "created": "Fri, 21 Feb 2014 05:01:24 GMT", "version": "v1" } ]
2014-08-24
[ [ "Thilagavathi", "D.", "" ], [ "Thanamani", "Antony Selvadoss", "" ] ]
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1402.5207
Maxwell Young
Michael A. Bender and Jeremy T. Fineman and Seth Gilbert and Maxwell Young
How to Scale Exponential Backoff
null
null
null
null
cs.DC cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Randomized exponential backoff is a widely deployed technique for coordinating access to a shared resource. A good backoff protocol should, arguably, satisfy three natural properties: (i) it should provide constant throughput, wasting as little time as possible; (ii) it should require few failed access attempts, minimizing the amount of wasted effort; and (iii) it should be robust, continuing to work efficiently even if some of the access attempts fail for spurious reasons. Unfortunately, exponential backoff has some well-known limitations in two of these areas: it provides poor (sub-constant) throughput (in the worst case), and is not robust (to resource acquisition failures). The goal of this paper is to "fix" exponential backoff by making it scalable, particularly focusing on the case where processes arrive in an on-line, worst-case fashion. We present a relatively simple backoff protocol~Re-Backoff~that has, at its heart, a version of exponential backoff. It guarantees expected constant throughput with dynamic process arrivals and requires only an expected polylogarithmic number of access attempts per process. Re-Backoff is also robust to periods where the shared resource is unavailable for a period of time. If it is unavailable for $D$ time slots, Re-Backoff provides the following guarantees. When the number of packets is a finite $n$, the average expected number of access attempts for successfully sending a packet is $O(\log^2( n + D))$. In the infinite case, the average expected number of access attempts for successfully sending a packet is $O( \log^2(\eta) + \log^2(D) )$ where $\eta$ is the maximum number of processes that are ever in the system concurrently.
[ { "created": "Fri, 21 Feb 2014 05:47:48 GMT", "version": "v1" }, { "created": "Wed, 16 Jul 2014 14:51:16 GMT", "version": "v2" }, { "created": "Fri, 14 Nov 2014 06:09:09 GMT", "version": "v3" }, { "created": "Sun, 12 Jul 2015 06:09:28 GMT", "version": "v4" } ]
2015-07-14
[ [ "Bender", "Michael A.", "" ], [ "Fineman", "Jeremy T.", "" ], [ "Gilbert", "Seth", "" ], [ "Young", "Maxwell", "" ] ]
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1402.5208
Bhaskar DasGupta
Bhaskar DasGupta and Lakshmi Kaligounder
Densely Entangled Financial Systems
to appear in Network Models in Economics and Finance, V. Kalyagin, P. M. Pardalos and T. M. Rassias (editors), Springer Optimization and Its Applications series, Springer, 2014
in Network Models in Economics and Finance, V. Kalyagin, P. M. Pardalos and Th. M. Rassias (eds.), Springer Optimization and Its Applications series, 100, 85-105, Springer, 2014
10.1007/978-3-319-09683-4__5
null
q-fin.RM cs.CE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In [1] Zawadoski introduces a banking network model in which the asset and counter-party risks are treated separately and the banks hedge their assets risks by appropriate OTC contracts. In his model, each bank has only two counter-party neighbors, a bank fails due to the counter-party risk only if at least one of its two neighbors default, and such a counter-party risk is a low probability event. Informally, the author shows that the banks will hedge their asset risks by appropriate OTC contracts, and, though it may be socially optimal to insure against counter-party risk, in equilibrium banks will {\em not} choose to insure this low probability event. In this paper, we consider the above model for more general network topologies, namely when each node has exactly 2r counter-party neighbors for some integer r>0. We extend the analysis of [1] to show that as the number of counter-party neighbors increase the probability of counter-party risk also increases, and in particular the socially optimal solution becomes privately sustainable when each bank hedges its risk to at least n/2 banks, where n is the number of banks in the network, i.e., when 2r is at least n/2, banks not only hedge their asset risk but also hedge its counter-party risk.
[ { "created": "Fri, 21 Feb 2014 05:54:10 GMT", "version": "v1" } ]
2018-08-20
[ [ "DasGupta", "Bhaskar", "" ], [ "Kaligounder", "Lakshmi", "" ] ]
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1402.5214
Takahiro Kohsokabe
Takahiro Kohsokabe and Kunihiko Kaneko
Evolution-Development Congruence in Pattern Formation Dynamics: Bifurcations in Gene Expressions and Regulation of Networks Structures
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null
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q-bio.PE physics.bio-ph q-bio.MN
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Search for possible relationships between phylogeny and ontogeny is one of the most important issues in the field of evolutionary developmental biology. By representing developmental dynamics of spatially located cells with gene expression dynamics with cell-to-cell interaction under external morphogen gradient, evolved are gene regulation networks under mutation and selection with the fitness to approach a prescribed spatial pattern of expressed genes. For most of thousands of numerical evolution experiments, evolution of pattern over generations and development of pattern by an evolved network exhibit remarkable congruence. Here, both the pattern dynamics consist of several epochs to form successive stripe formations between quasi-stationary regimes. In evolution, the regimes are generations needed to hit relevant mutations, while in development, they are due to the emergence of slowly varying expression that controls the pattern change. Successive pattern changes are thus generated, which are regulated by successive combinations of feedback or feedforward regulations under the upstream feedforward network that reads the morphogen gradient. By using a pattern generated by the upstream feedforward network as a boundary condition, downstream networks form later stripe patterns. These epochal changes in development and evolution are represented as same bifurcations in dynamical-systems theory, and this agreement of bifurcations lead to the evolution-development congruences. Violation of the evolution-development congruence, observed exceptionally, is shown to be originated in alteration of the boundary due to mutation at the upstream feedforward network. Our results provide a new look on developmental stages, punctuated equilibrium, developmental bottlenecks, and evolutionary acquisition of novelty in morphogenesis.
[ { "created": "Fri, 21 Feb 2014 06:35:54 GMT", "version": "v1" }, { "created": "Tue, 31 Mar 2015 00:59:06 GMT", "version": "v2" } ]
2015-04-01
[ [ "Kohsokabe", "Takahiro", "" ], [ "Kaneko", "Kunihiko", "" ] ]
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1402.5223
Yoichi Tanabe
Yoichi Tanabe, Khuong Kim Huynh, Ryo Nouchi, Satoshi Heguri, Gang Mu, Jingtao Xu, Hidekazu Shimotani, Katsumi Tanigaki
Electron and Hole Injection via Charge Transfer at the Topological-Insulator $Bi_{2-x}Sb_xTe_{3-y}Se_y$/Organic-Molecule Interface
22 page, 3 figure
J. Phys. Chem. C 2014, 118, 3533-3538
10.1021/jp409715s
null
cond-mat.mtrl-sci cond-mat.mes-hall physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
As a methodology for controlling the carrier transport of topological insulators (TI's), a flexible tuning in carrier number on the surface states (SS's) of three dimensional TI's by surface modifications using organic molecules is described. The principle of the carrier tuning and its type conversion of TI's presented in this research are based on the charge transfer of holes or electrons at the TI/organic molecule interface. By employing 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4-TCNQ) as an electron acceptor or tetracyanoquinodimethane (TCNQ) as a donor for n- and p- Bi2-xSbxTe3-ySey (BSTS) single crystals, successful carrier conversion from n to p and its reverse mode is demonstrated depending on the electron affinities of the molecules. The present method provides a nondestructive and efficient method for local tuning in carrier density of TI's, and is useful for future applications.
[ { "created": "Fri, 21 Feb 2014 08:06:40 GMT", "version": "v1" } ]
2014-02-24
[ [ "Tanabe", "Yoichi", "" ], [ "Huynh", "Khuong Kim", "" ], [ "Nouchi", "Ryo", "" ], [ "Heguri", "Satoshi", "" ], [ "Mu", "Gang", "" ], [ "Xu", "Jingtao", "" ], [ "Shimotani", "Hidekazu", "" ], [ "Tanigaki", "Katsumi", "" ] ]
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1402.5224
Yaroslav Kartashov
Yaroslav V. Kartashov, Victor A. Vysloukh
Mode conversion in nonlinear waveguides stimulated by the longitudinal bi-harmonic refractive index modulation
15 pages, 6 figures, to appear in Europhysics Letters
null
10.1209/0295-5075/105/54001
null
physics.optics nlin.PS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study specific features of resonant mode conversion in nonlinear waveguides stimulated by the bi-harmonic longitudinal modulation of its parameters, which includes changes of the waveguide depth as well as its bending (in the one-dimensional case) or spiraling (in the two-dimensional case). We demonstrate the possibility of simultaneous excitation of higher-order modes of different parities and topologies with controllable energy weights. The output mode composition is highly sensitive to the variation in the input power and detuning from the resonant modulation frequency.
[ { "created": "Fri, 21 Feb 2014 08:12:10 GMT", "version": "v1" } ]
2015-06-18
[ [ "Kartashov", "Yaroslav V.", "" ], [ "Vysloukh", "Victor A.", "" ] ]
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1402.5226
Toshimasa Morita
Toshimasa Morita
Approach towards quasi-monoenergetic laser ion acceleration with doped target
null
null
10.1063/1.4876759
null
physics.plasm-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Ion acceleration by using a laser pulse irradiating a disk target which includes hydrogen and carbon is examined using three-dimensional particle-in-cell simulations. It is shown that over $200$ MeV protons can be generated by using a $620$TW, $5\times10^{21}$ W/cm$^2$ laser pulse. In a polyethylene (CH$_2$) target, protons and carbon ions separate and form two layers by radiation pressure acceleration. A strong Coulomb explosion in this situation and Coulomb repulsion between each layer generates high energy protons. A doped target, low density hydrogen within a carbon disk, becomes a double layer target which is comprised of a thin and low density hydrogen disk on the surface of a high-$Z$ atom layer. This then generates a quasi-monoenergetic proton beam.
[ { "created": "Fri, 21 Feb 2014 08:14:40 GMT", "version": "v1" } ]
2015-06-18
[ [ "Morita", "Toshimasa", "" ] ]
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1402.5233
Dinesh Rabindran
Dinesh Rabindran and Delbert Tesar
Study of the Dynamic Coupling Term (\mu) in Parallel Force/Velocity Actuated Systems
Proc. IEEE International Conference on Automation Science and Engineering, Sept. 2007, Scottsdale, Arizona, pp. 418-423
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null
null
cs.RO
http://creativecommons.org/licenses/by-nc-sa/3.0/
Presented in this paper is an actuator concept, called a Parallel Force/Velocity Actuator (PFVA), that combines two fundamentally distinct actuators (one using low gear reduction or even direct drive, which we will call a Force Actuator (FA) and the other with a high reduction gear train that we will refer to as a Velocity Actuator (VA)). The objective of this work is to evaluate the effect of the relative scale factor, RSF, (ratio of gear reductions) between these inputs on their dynamic coupling. We conceptually describe a Parallel Force/Velocity Actuator (PFVA) based on a Dual-Input-Single- Output (DISO) epicyclic gear train. We then present an analytical formulation for the variation of the dynamic coupling term w.r.t. RSF. Conclusions from this formulation are illustrated through a numerical example involving a 1-DOF four-bar linkage. It is shown, both analytically and numerically, that as we increase the RSF, the two inputs to the PFVA are decoupled w.r.t. the inertia torques. This understanding can serve as an important design guideline for PFVAs. The paper also presents two limitations of this study and suggests future work based on these caveats.
[ { "created": "Fri, 21 Feb 2014 09:13:05 GMT", "version": "v1" } ]
2014-02-24
[ [ "Rabindran", "Dinesh", "" ], [ "Tesar", "Delbert", "" ] ]
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1402.5234
Yi Liu Dr
Sergey Mitryukovskiy, Yi Liu, Pengji Ding, Aur\'elien Houard, and Andr\'e Mysyrowicz
Backward stimulated radiation from filaments in Nitrogen gas and air pumped by circularly polarized 800 nm femtosecond laser pulses
null
null
10.1364/OE.22.012750
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We report on strong backward stimulated emission at 337 nm in Nitrogen gas pumped by circularly polarized femtosecond laser pulses at 800 nm. A distinct dependence of the backward UV spectrum on pump laser polarization and intensity is observed, pointing to the occurrence of backward amplified spontaneous emission inside filaments. We attribute the population inversion to inelastic collision between the free electrons produced by the pump laser and neutral N2 molecules. The addition of Oxygen molecules is detrimental for the gain, reducing it to near threshold at atmospheric concentration.
[ { "created": "Fri, 21 Feb 2014 09:14:56 GMT", "version": "v1" } ]
2015-06-18
[ [ "Mitryukovskiy", "Sergey", "" ], [ "Liu", "Yi", "" ], [ "Ding", "Pengji", "" ], [ "Houard", "Aurélien", "" ], [ "Mysyrowicz", "André", "" ] ]
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1402.5244
Mehmet Emre Tasgin
Mehmet Emre Tasgin, Ildar Salakhutdinov, Dania Kendziora, Musa Kurtulus Abak, Deniz Turkpence, Luca Piantanida, Ljiljana Fruk, Marco Lazzarino, and Alpan Bek
Fluorescence Excitation by Enhanced Plasmon Upconversion under Continuous Wave Illumination
11 pages, 8 figures
null
null
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We demonstrate effective background-free continuous wave nonlinear optical excitation of molecules that are sandwiched between asymmetrically constructed plasmonic gold nanoparticle clusters. We observe that near infrared photons are converted to visible photons through efficient plasmonic second harmonic generation. Our theoretical model and simulations demonstrate that Fano resonances may be responsible for being able to observe nonlinear conversion using a continuous wave light source. We show that nonlinearity enhancement of plasmonic nanostructures via coupled quantum mechanical oscillators such as molecules can be several orders larger as compared to their classical counterparts.
[ { "created": "Fri, 21 Feb 2014 10:36:29 GMT", "version": "v1" }, { "created": "Thu, 15 May 2014 11:47:58 GMT", "version": "v2" }, { "created": "Mon, 3 Aug 2015 17:35:14 GMT", "version": "v3" }, { "created": "Sun, 12 Jun 2016 12:31:39 GMT", "version": "v4" } ]
2016-06-14
[ [ "Tasgin", "Mehmet Emre", "" ], [ "Salakhutdinov", "Ildar", "" ], [ "Kendziora", "Dania", "" ], [ "Abak", "Musa Kurtulus", "" ], [ "Turkpence", "Deniz", "" ], [ "Piantanida", "Luca", "" ], [ "Fruk", "Ljiljana", "" ], [ "Lazzarino", "Marco", "" ], [ "Bek", "Alpan", "" ] ]
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1402.5245
Yann Busnel
Emmanuelle Anceaume (IRISA, INRIA - SUPELEC), Yann Busnel (LINA), Bruno Sericola (INRIA - IRISA)
New results on a generalized coupon collector problem using Markov chains
14 pages
null
null
null
math.PR cs.DM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study in this paper a generalized coupon collector problem, which consists in determining the distribution and the moments of the time needed to collect a given number of distinct coupons that are drawn from a set of coupons with an arbitrary probability distribution. We suppose that a special coupon called the null coupon can be drawn but never belongs to any collection. In this context, we obtain expressions of the distribution and the moments of this time. We also prove that the almost-uniform distribution, for which all the non-null coupons have the same drawing probability, is the distribution which minimizes the expected time to get a fixed subset of distinct coupons. This optimization result is extended to the complementary distribution of that time when the full collection is considered, proving by the way this well-known conjecture. Finally, we propose a new conjecture which expresses the fact that the almost-uniform distribution should minimize the complementary distribution of the time needed to get any fixed number of distinct coupons.
[ { "created": "Fri, 21 Feb 2014 10:37:27 GMT", "version": "v1" } ]
2014-02-24
[ [ "Anceaume", "Emmanuelle", "", "IRISA, INRIA - SUPELEC" ], [ "Busnel", "Yann", "", "LINA" ], [ "Sericola", "Bruno", "", "INRIA - IRISA" ] ]
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1402.5252
Oliver Brandt
Oliver Brandt, Sergio Fern\'andez-Garrido, Johannes K. Zettler, Esperanza Luna, Uwe Jahn, Caroline Ch\`eze, and Vladimir M. Kaganer
Statistical analysis of the shape of one-dimensional nanostructures: determining the coalescence degree of spontaneously formed GaN nanowires
null
Cryst. Growth Des. 14, 2246 (2014)
10.1021/cg401838q
null
cond-mat.mes-hall cond-mat.mtrl-sci physics.data-an
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Single GaN nanowires formed spontaneously on a given substrate represent nanoscopic single crystals free of any extended defects. However, due to the high area density of thus formed GaN nanowire ensembles, individual nanowires coalesce with others in their immediate vicinity. This coalescence process may introduce strain and structural defects, foiling the idea of defect-free material due to the nanowire geometry. To investigate the consequences of this process, a quantitative measure of the coalescence of nanowire ensembles is required. We derive objective criteria to determine the coalescence degree of GaN nanowire ensembles. These criteria are based on the area-perimeter relationship of the cross-sectional shapes observed, and in particular on their circularity. Employing these criteria, we distinguish single nanowires from coalesced aggregates in an ensemble, determine the diameter distribution of both, and finally analyze the coalescence degree of nanowire ensembles with increasing fill factor.
[ { "created": "Fri, 21 Feb 2014 11:10:51 GMT", "version": "v1" }, { "created": "Tue, 15 Apr 2014 08:01:08 GMT", "version": "v2" } ]
2015-03-27
[ [ "Brandt", "Oliver", "" ], [ "Fernández-Garrido", "Sergio", "" ], [ "Zettler", "Johannes K.", "" ], [ "Luna", "Esperanza", "" ], [ "Jahn", "Uwe", "" ], [ "Chèze", "Caroline", "" ], [ "Kaganer", "Vladimir M.", "" ] ]
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1402.5255
Christian von der Weth
Christian von der Weth, Manfred Hauswirth
Analysing Parallel and Passive Web Browsing Behavior and its Effects on Website Metrics
22 pages, 11 figures, 3 tables, 29 references. arXiv admin note: text overlap with arXiv:1307.1542
null
null
null
cs.HC cs.IR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Getting deeper insights into the online browsing behavior of Web users has been a major research topic since the advent of the WWW. It provides useful information to optimize website design, Web browser design, search engines offerings, and online advertisement. We argue that new technologies and new services continue to have significant effects on the way how people browse the Web. For example, listening to music clips on YouTube or to a radio station on Last.fm does not require users to sit in front of their computer. Social media and networking sites like Facebook or micro-blogging sites like Twitter have attracted new types of users that previously were less inclined to go online. These changes in how people browse the Web feature new characteristics which are not well understood so far. In this paper, we provide novel and unique insights by presenting first results of DOBBS, our long-term effort to create a comprehensive and representative dataset capturing online user behavior. We firstly investigate the concepts of parallel browsing and passive browsing, showing that browsing the Web is no longer a dedicated task for many users. Based on these results, we then analyze their impact on the calculation of a user's dwell time -- i.e., the time the user spends on a webpage -- which has become an important metric to quantify the popularity of websites.
[ { "created": "Fri, 21 Feb 2014 11:15:02 GMT", "version": "v1" } ]
2014-02-24
[ [ "von der Weth", "Christian", "" ], [ "Hauswirth", "Manfred", "" ] ]
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1402.5259
Gattaca Lv
Gattaca Lv
An Analysis of Rank Aggregation Algorithms
null
null
null
null
cs.DS cs.GT cs.MA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Rank aggregation is an essential approach for aggregating the preferences of multiple agents. One rule of particular interest is the Kemeny rule, which maximises the number of pairwise agreements between the final ranking and the existing rankings. However, Kemeny rankings are NP-hard to compute. This has resulted in the development of various algorithms. Fortunately, NP-hardness may not reflect the difficulty of solving problems that arise in practice. As a result, we aim to demonstrate that the Kemeny consensus can be computed efficiently when aggregating different rankings in real case. In this paper, we extend a dynamic programming algorithm originally for Kemeny scores. We also provide details on the implementation of the algorithm. Finally, we present results obtained from an empirical comparison of our algorithm and two other popular algorithms based on real world and randomly generated problem instances. Experimental results show the usefulness and efficiency of the algorithm in practical settings.
[ { "created": "Fri, 21 Feb 2014 11:25:42 GMT", "version": "v1" }, { "created": "Thu, 27 Feb 2014 12:00:15 GMT", "version": "v2" }, { "created": "Thu, 10 Apr 2014 05:07:10 GMT", "version": "v3" }, { "created": "Sat, 26 Apr 2014 15:16:20 GMT", "version": "v4" }, { "created": "Sun, 4 May 2014 17:35:45 GMT", "version": "v5" } ]
2014-05-06
[ [ "Lv", "Gattaca", "" ] ]
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1402.5261
Anna Mrozik Mrs
Anna Mrozik, Barbara Marczewska, Pawel Bilski and Wojciech Gieszczyk
Investigation of OSL signal of resistors from mobile phones for accidental dosimetry
The manuscript was submitted for publication in the Special Issue of Radiation Measurements. The SSD17 manuscript presented during Poster Session
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physics.ins-det
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Resistors from mobile phones, usually located near the human body, are considered as individual dosimeters of ionizing radiation in emergency situations. The resistors contain Al2O3, which is optically stimulated luminescence (OSL) material sensitive to ionizing radiation. This work is focused on determination of dose homogeneity within a mobile phones which was carried out by OSL measurements of resistors placed in different parts inside the mobile phone. Separate, commercially available resistors, similar in the shape and size to the resistors from circuit board of the studied mobile phone, were situated in different locations inside it. The irradiations were performed in uniform 60Co and 137Cs radiation fields, with the mobile phones connected and not connected to the cellular network. The dose decrease of 9% was measured for original resistors situated between layer of copper-clad laminate and battery, in comparison to the dose at the front of the phone. The resistors showed the lower signal when the mobile phone was connected to the cellular network, due to higher temperature inside the housing. The profile of fading was investigated within 3 month period for resistors irradiated with 1 Gy of gamma rays to estimate of the fading coefficient.
[ { "created": "Fri, 21 Feb 2014 11:46:30 GMT", "version": "v1" } ]
2014-02-24
[ [ "Mrozik", "Anna", "" ], [ "Marczewska", "Barbara", "" ], [ "Bilski", "Pawel", "" ], [ "Gieszczyk", "Wojciech", "" ] ]
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1402.5265
Rami Mochaourab
Rami Mochaourab and Eduard Jorswieck
Coalitional Games in MISO Interference Channels: Epsilon-Core and Coalition Structure Stable Set
to appear in IEEE Transactions on Signal Processing, 14 pages, 14 figures, 3 tables
null
10.1109/TSP.2014.2367466
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The multiple-input single-output interference channel is considered. Each transmitter is assumed to know the channels between itself and all receivers perfectly and the receivers are assumed to treat interference as additive noise. In this setting, noncooperative transmission does not take into account the interference generated at other receivers which generally leads to inefficient performance of the links. To improve this situation, we study cooperation between the links using coalitional games. The players (links) in a coalition either perform zero forcing transmission or Wiener filter precoding to each other. The $\epsilon$-core is a solution concept for coalitional games which takes into account the overhead required in coalition deviation. We provide necessary and sufficient conditions for the strong and weak $\epsilon$-core of our coalitional game not to be empty with zero forcing transmission. Since, the $\epsilon$-core only considers the possibility of joint cooperation of all links, we study coalitional games in partition form in which several distinct coalitions can form. We propose a polynomial time distributed coalition formation algorithm based on coalition merging and prove that its solution lies in the coalition structure stable set of our coalition formation game. Simulation results reveal the cooperation gains for different coalition formation complexities and deviation overhead models.
[ { "created": "Fri, 21 Feb 2014 11:55:42 GMT", "version": "v1" }, { "created": "Thu, 26 Jun 2014 15:12:14 GMT", "version": "v2" }, { "created": "Fri, 31 Oct 2014 18:13:58 GMT", "version": "v3" }, { "created": "Wed, 12 Nov 2014 17:38:05 GMT", "version": "v4" } ]
2015-06-18
[ [ "Mochaourab", "Rami", "" ], [ "Jorswieck", "Eduard", "" ] ]
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1402.5267
J\"urgen M\"unch
Holger Neu, Thomas Hanne, J\"urgen M\"unch, Stefan Nickel, Andreas Wirsen
Simulation-Based Risk Reduction for Planning Inspections
16 pages. The final publication is available at http://link.springer.com/chapter/10.1007%2F3-540-36209-6_9
Product Focused Software Process Improvement, volume 2559 of Lecture Notes in Computer Science, pages 78-93. Springer Berlin Heidelberg, 2002
10.1007/3-540-36209-6_9
null
cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Organizations that develop software have recognized that software process models are particularly useful for maintaining a high standard of quality. In the last decade, simulations of software processes were used in several settings and environments. This paper gives a short overview of the benefits of software process simulation and describes the development of a discrete-event model, a technique rarely used before in that field. The model introduced in this paper captures the behavior of a detailed code inspection process. It aims at reducing the risks inherent in implementing inspection processes and techniques in the overall development process. The determination of the underlying cause-effect relations using data mining techniques and empirical data is explained. Finally, the paper gives an outlook on our future work.
[ { "created": "Fri, 21 Feb 2014 11:59:25 GMT", "version": "v1" } ]
2014-02-24
[ [ "Neu", "Holger", "" ], [ "Hanne", "Thomas", "" ], [ "Münch", "Jürgen", "" ], [ "Nickel", "Stefan", "" ], [ "Wirsen", "Andreas", "" ] ]
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1402.5271
Ian Hill Ph.D.
Ian R. Hill, Yuri B. Ovchinnikov, Elizabeth M. Bridge, E. Anne Curtis, Patrick Gill
Zeeman Slowers for Strontium based on Permanent Magnets
null
null
10.1088/0953-4075/47/7/075006
null
physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present the design, construction, and characterisation of longitudinal- and transverse-field Zeeman slowers, based on arrays of permanent magnets, for slowing thermal beams of atomic Sr. The slowers are optimised for operation with deceleration related to the local laser intensity (by the parameter $\epsilon$), which uses more effectively the available laser power, in contrast to the usual constant deceleration mode. Slowing efficiencies of up to $\approx$ $18$ $%$ are realised and compared to those predicted by modelling. We highlight the transverse-field slower, which is compact, highly tunable, light-weight, and requires no electrical power, as a simple solution to slowing Sr, well-suited to spaceborne application. For $^{88}$Sr we achieve a slow-atom flux of around $6\times 10^9$ atoms$\,$s$^{-1}$ at $30$ ms$^{-1}$, loading approximately $5\times 10^8$ atoms in to a magneto-optical-trap (MOT), and capture all isotopes in approximate relative natural abundances.
[ { "created": "Fri, 21 Feb 2014 12:17:34 GMT", "version": "v1" } ]
2015-06-18
[ [ "Hill", "Ian R.", "" ], [ "Ovchinnikov", "Yuri B.", "" ], [ "Bridge", "Elizabeth M.", "" ], [ "Curtis", "E. Anne", "" ], [ "Gill", "Patrick", "" ] ]
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1402.5273
Aurelien Drezet
A. Drezet and C. Genet
Imaging surface plasmons: from leaky waves to far-field radiation
This contains the original Phys. Rev. Lett. article and the supplementary information file
Phys. Rev. Lett. 110, 213901 (2013)
10.1103/PhysRevLett.110.213901
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We show that, contrary to the common wisdom, surface plasmon poles are not involved in the imaging process in leakage radiation microscopy. Identifying the leakage radiation modes directly from a transverse magnetic potential leads us to reconsider the surface plasmon field and unfold the non-plasmonic contribution to the image formation. While both contributions interfere in the imaging process, our analysis reveals that the reassessed plasmonic field embodies a pole mathematically similar to the usual surface plasmon pole. This removes a long-standing ambiguity associated with plasmonic signals in leakage radiation microscopy.
[ { "created": "Fri, 21 Feb 2014 12:23:13 GMT", "version": "v1" } ]
2015-06-18
[ [ "Drezet", "A.", "" ], [ "Genet", "C.", "" ] ]
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1402.5275
Abhishek Bhattacharya
Tanusree Chatterjee, Abhishek Bhattacharya
VHDL Modeling of Intrusion Detection & Prevention System (IDPS) A Neural Network Approach
null
null
10.14445/22312803/IJCTT-V8P110
null
cs.CR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The rapid development and expansion of World Wide Web and network systems have changed the computing world in the last decade and also equipped the intruders and hackers with new facilities for their destructive purposes. The cost of temporary or permanent damages caused by unauthorized access of the intruders to computer systems has urged different organizations to increasingly implement various systems to monitor data flow in their network. The systems are generally known as Intrusion Detection System (IDS).Our objective is to implement an artificial network approach to the design of intrusion detection and prevention system and finally convert the designed model to a VHDL (Very High Speed Integrated Circuit Hardware Descriptive Language) code. This feature enables the system to suggest proper actions against possible attacks. The promising results of the present study show the potential applicability of ANNs for developing practical IDSs.
[ { "created": "Fri, 21 Feb 2014 12:27:55 GMT", "version": "v1" } ]
2014-02-24
[ [ "Chatterjee", "Tanusree", "" ], [ "Bhattacharya", "Abhishek", "" ] ]
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1402.5281
Aurelien Drezet
O. Mollet, G. Bachelier, C. Genet, S. Huant, A. Drezet
Plasmonic interferometry: probing launching dipoles in scanning-probe plasmonics
To appear in Journal of Applied Physics (2014)
null
10.1063/1.4867395
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We develop a semi-analytical method for analyzing surface plasmon interferometry using near-field scanning optical sources. We compare our approach to Young double hole interferometry experiments using scanning tunneling microscope (STM) discussed in the literature and realize experiments with an aperture near-field scanning optical microscope (NSOM) source positioned near a ring like aperture slit milled in a thick gold film. In both cases the agreement between experiments and model is very good. We emphasize the role of dipole orientations and discuss the role of magnetic versus electric dipole contributions to the imaging process as well as the directionality of the effective dipoles associated with the various optical and plasmonic sources.
[ { "created": "Fri, 21 Feb 2014 12:42:50 GMT", "version": "v1" } ]
2015-06-18
[ [ "Mollet", "O.", "" ], [ "Bachelier", "G.", "" ], [ "Genet", "C.", "" ], [ "Huant", "S.", "" ], [ "Drezet", "A.", "" ] ]
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1402.5284
Andr\'e Uschmajew
Reinhold Schneider and Andr\'e Uschmajew
Convergence results for projected line-search methods on varieties of low-rank matrices via \L{}ojasiewicz inequality
null
null
null
null
math.OC cs.LG math.NA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The aim of this paper is to derive convergence results for projected line-search methods on the real-algebraic variety $\mathcal{M}_{\le k}$ of real $m \times n$ matrices of rank at most $k$. Such methods extend Riemannian optimization methods, which are successfully used on the smooth manifold $\mathcal{M}_k$ of rank-$k$ matrices, to its closure by taking steps along gradient-related directions in the tangent cone, and afterwards projecting back to $\mathcal{M}_{\le k}$. Considering such a method circumvents the difficulties which arise from the nonclosedness and the unbounded curvature of $\mathcal{M}_k$. The pointwise convergence is obtained for real-analytic functions on the basis of a \L{}ojasiewicz inequality for the projection of the antigradient to the tangent cone. If the derived limit point lies on the smooth part of $\mathcal{M}_{\le k}$, i.e. in $\mathcal{M}_k$, this boils down to more or less known results, but with the benefit that asymptotic convergence rate estimates (for specific step-sizes) can be obtained without an a priori curvature bound, simply from the fact that the limit lies on a smooth manifold. At the same time, one can give a convincing justification for assuming critical points to lie in $\mathcal{M}_k$: if $X$ is a critical point of $f$ on $\mathcal{M}_{\le k}$, then either $X$ has rank $k$, or $\nabla f(X) = 0$.
[ { "created": "Fri, 21 Feb 2014 12:49:51 GMT", "version": "v1" }, { "created": "Tue, 9 Sep 2014 14:46:26 GMT", "version": "v2" }, { "created": "Wed, 22 Apr 2015 17:15:02 GMT", "version": "v3" } ]
2015-04-23
[ [ "Schneider", "Reinhold", "" ], [ "Uschmajew", "André", "" ] ]
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1402.5287
Gleb Beliakov
Gleb Beliakov
On fast matrix-vector multiplication with a Hankel matrix in multiprecision arithmetics
11 pages
null
null
null
math.NA cs.NA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present two fast algorithms for matrix-vector multiplication $y=Ax$, where $A$ is a Hankel matrix. The current asymptotically fastest method is based on the Fast Fourier Transform (FFT), however in multiprecision arithmetics with very high accuracy FFT method is actually slower than schoolbook multiplication for matrix sizes up to $n=8000$. One method presented is based on a decomposition of multiprecision numbers into sums, and applying standard or double precision FFT. The second method, inspired by Karatsuba multiplication, is based on recursively performing multiplications with matrices of half-size of the original. Its complexity in terms of the matrix size $n$ is $\Theta(n^{\log 3})$. Both methods are applicable to Toeplitz matrices and to circulant matrices.
[ { "created": "Fri, 21 Feb 2014 13:03:18 GMT", "version": "v1" }, { "created": "Mon, 24 Mar 2014 10:40:07 GMT", "version": "v2" } ]
2014-03-25
[ [ "Beliakov", "Gleb", "" ] ]
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1402.5292
Francois Lique
Fran\c{c}ois Lique, Pascal Honvault and Alexandre Faure
Ortho-para-H$_2$ conversion processes in astrophysical media
34 pages, 7 fugures
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null
null
physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We report in this review recent fully-quantum time-independent calculations of cross sections and rate constants for the gas phase ortho-to-para conversion of H$_2$ by H and H$^+$. Such processes are of crucial interest and importance in various astrophysical environments. The investigated temperature ranges was 10$-$1500 K for H+H$_2$ and 10$-$100 K for H$^+$+H$_2$. Calculations were based on highly accurate H$_3$ and H$_3^+$ global potential energy surfaces. Comparisons with previous calculations and with available measurements are presented and discussed. It is shown that the existence of a long-lived intermediate complex H$_3^+$ in the (barrierless) H$^+$+H$_2$ reaction give rise to a pronounced resonance structure and a statistical behaviour, in contrast to H+H$_2$ which proceeds through a barrier of $\sim 5000$ K. In the cold interstellar medium ($T\leq 100$ K), the ortho-to-para conversion is thus driven by proton exchange while above $\sim$300 K, the contribution of hydrogen atoms become significant or even dominant. Astrophysical applications are briefly discussed by comparing, in particular, the relative role of the conversion processes in the gas phase ({\it via} H, H$^+$, H$_2$ and H$_3^+$) and on the surface of dust particles. Perspectives concerning future calculations at higher temperatures are outlined.
[ { "created": "Fri, 21 Feb 2014 13:42:54 GMT", "version": "v1" } ]
2014-02-24
[ [ "Lique", "François", "" ], [ "Honvault", "Pascal", "" ], [ "Faure", "Alexandre", "" ] ]
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1402.5294
Christoph Hauri
Andrei G. Stepanov, Clemens Ruchert, Julien Levallois, Christian Erny and Christoph P. Hauri
Generation of broadband THz pulses in organic crystal OH1 at room temperature and 10 K
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cond-mat.mtrl-sci physics.optics
http://creativecommons.org/licenses/publicdomain/
We studied the effects of cryogenic cooling of a 2-[3-(4-hydroxystyryl)-5, 5-dimethylcyclohex-2-enylidene] malononitrile (OH1) crystal on the generation of broadband THz pulses via collinear optical rectification of 1350 nm femtosecond laser pulses. Cooling of the OH1 crystal from room temperature to 10 K leads to a ~10% increase of the pump-to-THz energy conversion efficiency and a shift of the THz pulse spectra to a higher frequency range. Both effects are due the temperature variation of THz absorption and the refractive index of the OH1 crystal. This conclusion has been verified by temperature dependent measurements of the linear absorption in the THz frequency region.
[ { "created": "Fri, 21 Feb 2014 13:51:40 GMT", "version": "v1" }, { "created": "Wed, 5 Mar 2014 13:20:29 GMT", "version": "v2" } ]
2014-03-06
[ [ "Stepanov", "Andrei G.", "" ], [ "Ruchert", "Clemens", "" ], [ "Levallois", "Julien", "" ], [ "Erny", "Christian", "" ], [ "Hauri", "Christoph P.", "" ] ]
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1402.5301
Andreas Skyman
Andreas Skyman, Hans Nordman, Daniel Tegnered
Gyrokinetic modelling of stationary electron and impurity profiles in tokamaks
18 pages, 10 figures, submitted to Physics of Plasmas
null
10.1063/1.4894739
null
physics.plasm-ph
http://creativecommons.org/licenses/by/3.0/
Particle transport due to Ion Temperature Gradient/Trapped Electron (ITG/TE) mode turbulence is investigated using the gyrokinetic code GENE. Both a reduced quasilinear (QL) treatment and nonlinear (NL) simulations are performed for typical tokamak parameters corresponding to ITG dominated turbulence. A selfconsistent treatment is used, where the stationary local profiles are calculated corresponding to zero particle flux simultaneously for electrons and trace impurities. The scaling of the stationary profiles with magnetic shear, safety factor, electron-to-ion temperature ratio, collisionality, toroidal sheared rotation, triangularity, and elongation is investigated. In addition, the effect of different main ion mass on the zero flux condition is discussed. The electron density gradient can significantly affect the stationary impurity profile scaling. It is therefore expected, that a selfconsistent treatment will yield results more comparable to experimental results for parameter scans where the stationary background density profile is sensitive. This is shown to be the case in scans over magnetic shear, collisionality, elongation, and temperature ratio, for which the simultaneous zero flux electron and impurity profiles are calculated. A slight asymmetry between hydrogen, deuterium and tritium with respect to profile peaking is obtained, in particular for scans in collisionality and temperature ratio.
[ { "created": "Fri, 21 Feb 2014 14:29:28 GMT", "version": "v1" } ]
2015-06-18
[ [ "Skyman", "Andreas", "" ], [ "Nordman", "Hans", "" ], [ "Tegnered", "Daniel", "" ] ]
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1402.5303
Andrew Winslow
Eli Fox-Epstein, Csaba T\'oth, and Andrew Winslow
Diffuse Reflection Radius in a Simple Polygon
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null
null
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cs.CG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
It is shown that every simple polygon in general position with $n$ walls can be illuminated from a single point light source $s$ after at most $\lfloor (n-2)/4\rfloor$ diffuse reflections, and this bound is the best possible. A point $s$ with this property can be computed in $O(n\log n)$ time. It is also shown that the minimum number of diffuse reflections needed to illuminate a given simple polygon from a single point can be approximated up to an additive constant in polynomial time.
[ { "created": "Fri, 21 Feb 2014 14:33:25 GMT", "version": "v1" }, { "created": "Mon, 24 Feb 2014 18:33:16 GMT", "version": "v2" }, { "created": "Sun, 17 May 2015 22:26:29 GMT", "version": "v3" } ]
2015-05-19
[ [ "Fox-Epstein", "Eli", "" ], [ "Tóth", "Csaba", "" ], [ "Winslow", "Andrew", "" ] ]
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1402.5307
Joseph Cotter
Sandra Eibenberger, Xiaxi Cheng, J.P. Cotter, Markus Arndt
Absolute absorption cross sections from photon recoil in a matter-wave interferometer
Four pages, three figures
Phys. Rev. Lett. 112, 250402 (2014)
10.1103/PhysRevLett.112.250402
null
quant-ph physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We measure the absolute absorption cross section of molecules using a matter-wave interferometer. A nanostructured density distribution is imprinted onto a dilute molecular beam through quantum interference. As the beam crosses the light field of a probe laser some molecules will absorb a single photon. These absorption events impart a momentum recoil which shifts the position of the molecule relative to the unperturbed beam. Averaging over the shifted and unshifted components within the beam leads to a reduction of the fringe visibility, enabling the absolute absorption cross section to be extracted with high accuracy. This technique is independent of the molecular density, it is minimally invasive and successfully eliminates all problems related to photon-cycling, state-mixing, photo-bleaching, photo-induced heating, fragmentation and ionization. It can therefore be extended to a wide variety of neutral molecules, clusters and nanoparticles.
[ { "created": "Fri, 21 Feb 2014 14:40:37 GMT", "version": "v1" }, { "created": "Wed, 13 Aug 2014 10:06:27 GMT", "version": "v2" } ]
2014-08-20
[ [ "Eibenberger", "Sandra", "" ], [ "Cheng", "Xiaxi", "" ], [ "Cotter", "J. P.", "" ], [ "Arndt", "Markus", "" ] ]
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1402.5310
Donn Morrison
Donn Morrison
Toward automatic censorship detection in microblogs
13 pages. Updated with example cascades figure and typo fixes. To appear at the International Workshop on Data Mining in Social Networks (PAKDD-SocNet) 2014
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null
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cs.SI physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Social media is an area where users often experience censorship through a variety of means such as the restriction of search terms or active and retroactive deletion of messages. In this paper we examine the feasibility of automatically detecting censorship of microblogs. We use a network growing model to simulate discussion over a microblog follow network and compare two censorship strategies to simulate varying levels of message deletion. Using topological features extracted from the resulting graphs, a classifier is trained to detect whether or not a given communication graph has been censored. The results show that censorship detection is feasible under empirically measured levels of message deletion. The proposed framework can enable automated censorship measurement and tracking, which, when combined with aggregated citizen reports of censorship, can allow users to make informed decisions about online communication habits.
[ { "created": "Fri, 21 Feb 2014 14:47:20 GMT", "version": "v1" }, { "created": "Thu, 27 Feb 2014 13:28:06 GMT", "version": "v2" } ]
2014-02-28
[ [ "Morrison", "Donn", "" ] ]
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1402.5311
Eldar Aharoni
Eldar Aharoni and Eyal Kushilevitz
On the Power of Multiplexing in Number-on-the-Forehead Protocols
null
null
null
null
cs.CC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the direct-sum problem for $k$-party ``Number On the Forehead'' (NOF) deterministic communication complexity. We prove several positive results, showing that the complexity of computing a function $f$ in this model, on $\ell$ instances, may be significantly cheaper than $\ell$ times the complexity of computing $f$ on a single instance. Quite surprisingly, we show that this is the case for ``most'' (boolean, $k$-argument) functions. We then formalize two-types of sufficient conditions on a NOF protocol $Q$, for a single instance, each of which guarantees some communication complexity savings when appropriately extending $Q$ to work on $\ell$ instances. One such condition refers to what each party needs to know about inputs of the other parties, and the other condition, additionally, refers to the communication pattern that the single-instance protocol $Q$ uses. In both cases, the tool that we use is ``multiplexing'': we combine messages sent in parallel executions of protocols for a single instance, into a single message for the multi-instance (direct-sum) case, by xoring them with each other.
[ { "created": "Fri, 21 Feb 2014 14:53:11 GMT", "version": "v1" } ]
2014-02-24
[ [ "Aharoni", "Eldar", "" ], [ "Kushilevitz", "Eyal", "" ] ]
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1402.5313
Aurelien Drezet
O. Mollet, S. Huant, and A. Drezet
Scanning plasmonic microscopy by image reconstruction from the Fourier space
null
Optics Express vol. 20, pp. 28923-28928 (2012)
10.1364/OE.20.028923
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We demonstrate a simple scheme for high-resolution imaging of nanoplasmonic structures that basically removes most of the resolution limiting allowed light usually transmitted to the far field. This is achieved by implementing a Fourier lens in a near-field scanning optical microscope (NSOM) operating in the leakage-radiation microscopy (LRM) mode. The method consists of reconstructing optical images solely from the plasmonic `forbidden' light collected in the Fourier space. It is demonstrated by using a point-like nanodiamond-based tip that illuminates a thin gold film patterned with a sub-wavelength annular slit. The reconstructed image of the slit shows a spatial resolution enhanced by a factor $\simeq 4$ compared to NSOM images acquired directly in the real space.
[ { "created": "Fri, 21 Feb 2014 14:55:41 GMT", "version": "v1" }, { "created": "Tue, 25 Feb 2014 08:39:45 GMT", "version": "v2" } ]
2015-06-18
[ [ "Mollet", "O.", "" ], [ "Huant", "S.", "" ], [ "Drezet", "A.", "" ] ]
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1402.5318
Stefano Vercellati
Ilario Boscolo, Fabrizio Castelli, Marco Stellato, Stefano Vercellati
The parametric spring-mass system, its connection with non-linear optics, and an approach for undergraduate students
11 pages, 11 figures,submitted to American Journal of Physics
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null
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physics.ed-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The spring-mass system studied in undergraduate physics laboratories may exhibit complex dynamics due to the simultaneous action of gravitational and elastic forces in addition to air friction. In the first part of this paper, we describe a laboratory experiment aimed at beginner students which also gives those with a more advanced background an opportunity to explore more complex aspects of the motions involved. If students are not given predefined apparatus but are allowed instead to design their own set-up for the experiment, they may also learn something about the thought processes and experimental procedures used in physics. In the second part of this paper, we present a systematic study of the parametric behavior of the system because teachers have to master its dynamics. The non-linear interaction between the vertical and the pendular oscillations in a vertical spring-mass system depends on the ratio between the frequencies of the two motions and on the motion's excitation. Systematic experimental investigations, coupled with relevant simulations, highlight the many aspects of physics involved in the partition of energy transfer between the two modes. The different motion waveforms obtained by sweeping through the resonance curve and by applying small and strong excitations are presented and analyzed. The influence of the unavoidable spurious motions is investigated. An analogy between the parametric interaction in a spring--mass system and that found during frequency conversion in non-linear optical crystals is discussed.
[ { "created": "Fri, 21 Feb 2014 15:06:27 GMT", "version": "v1" } ]
2014-02-24
[ [ "Boscolo", "Ilario", "" ], [ "Castelli", "Fabrizio", "" ], [ "Stellato", "Marco", "" ], [ "Vercellati", "Stefano", "" ] ]
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1402.5322
Xinlu Xu
X. L. Xu (1), Y. P. Wu (1), C. J. Zhang (1), F. Li (1), Y. Wan (1), J. F. Hua (1), C.-H. Pai (1), W. Lu (1,2), P. Yu (2), C. Joshi (2) and W. B. Mori (2) ((1) Tsinghua University, China (2) University of California Los Angeles)
Low emittance electron beam generation from a laser wakefield accelerator using two laser pulses with different wavelengths
18 pages (one column), 7 figures
null
10.1103/PhysRevSTAB.17.061301
null
physics.acc-ph physics.plasm-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Ionization injection triggered by short wavelength laser pulses inside a nonlinear wakefield driven by a longer wavelength laser is examined via multi-dimensional particle-in-cell simulations. We find that very bright electron beams can be generated through this two-color scheme in either collinear propagating or transverse colliding geometry. For a fixed laser intensity $I$, lasers with longer/shorter wavelength $\lambda$ have larger/smaller ponderomotive potential ($\propto I \lambda^2$). The two color scheme utilizes this property to separate the injection process from the wakefield excitation process. Very strong wakes can be generated at relatively low laser intensities by using a longer wavelength laser driver (e.g. a $10 \micro\meter$ CO$_2$ laser) due to its very large ponderomotive potential. On the other hand, short wavelength laser can produce electrons with very small residual momenta ($p_\perp\sim a_0\sim \sqrt{I}\lambda$) inside the wake, leading to electron beams with very small normalized emittances (tens of $\nano\meter$). Using particle-in-cell simulations we show that a $\sim10 \femto\second$ electron beam with $\sim4 \pico\coulomb$ of charge and a normalized emittance of $\sim 50 \nano\meter$ can be generated by combining a 10 $\micro\meter $ driving laser with a 400 $\nano\meter$ injection laser, which is an improvement of more than one order of magnitude compared to the typical results obtained when a single wavelength laser used for both the wake formation and ionization injection.
[ { "created": "Fri, 21 Feb 2014 15:16:18 GMT", "version": "v1" } ]
2015-06-18
[ [ "Xu", "X. L.", "" ], [ "Wu", "Y. P.", "" ], [ "Zhang", "C. J.", "" ], [ "Li", "F.", "" ], [ "Wan", "Y.", "" ], [ "Hua", "J. F.", "" ], [ "Pai", "C. -H.", "" ], [ "Lu", "W.", "" ], [ "Yu", "P.", "" ], [ "Joshi", "C.", "" ], [ "Mori", "W. B.", "" ] ]
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1402.5323
Francis Bell III
Francis Bell, Chunyu Zhao, Ahmet Sacan
PDBCirclePlot: A Novel Visualization Method for Protein Structures
Application note, 5 pages, 1 figure
null
null
null
q-bio.QM cs.CE q-bio.BM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Interactive molecular graphics applications facilitate analysis of three dimensional protein structures. Naturally, non-interactive 2-D snapshots of the protein structures do not convey the same level of geometric detail. Several 2-D visualization methods have been in use to summarize structural information, including contact maps and 2-D cartoon views. We present a new approach for 2-D visualization of protein structures where amino acid residues are displayed on a circle and spatially close residues are depicted by links. Furthermore, residue-specific properties, such as conservation, accessibility, temperature factor, can be displayed as plots on the same circular view.
[ { "created": "Thu, 20 Feb 2014 20:35:48 GMT", "version": "v1" } ]
2014-02-24
[ [ "Bell", "Francis", "" ], [ "Zhao", "Chunyu", "" ], [ "Sacan", "Ahmet", "" ] ]
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1402.5324
Alexander Jones
Alex D. Jones, Ben Adcock, Anders C. Hansen
On Asymptotic Incoherence and its Implications for Compressed Sensing of Inverse Problems
null
null
null
null
cs.IT math.IT math.NA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Recently, it has been shown that incoherence is an unrealistic assumption for compressed sensing when applied to many inverse problems. Instead, the key property that permits efficient recovery in such problems is so-called local incoherence. Similarly, the standard notion of sparsity is also inadequate for many real world problems. In particular, in many applications, the optimal sampling strategy depends on asymptotic incoherence and the signal sparsity structure. The purpose of this paper is to study asymptotic incoherence and its implications towards the design of optimal sampling strategies and efficient sparsity bases. It is determined how fast asymptotic incoherence can decay in general for isometries. Furthermore it is shown that Fourier sampling and wavelet sparsity, whilst globally coherent, yield optimal asymptotic incoherence as a power law up to a constant factor. Sharp bounds on the asymptotic incoherence for Fourier sampling with polynomial bases are also provided. A numerical experiment is also presented to demonstrate the role of asymptotic incoherence in finding good subsampling strategies.
[ { "created": "Fri, 21 Feb 2014 15:36:15 GMT", "version": "v1" }, { "created": "Tue, 7 Jul 2015 22:12:01 GMT", "version": "v2" } ]
2015-07-09
[ [ "Jones", "Alex D.", "" ], [ "Adcock", "Ben", "" ], [ "Hansen", "Anders C.", "" ] ]
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1402.5326
Cheuk Ting Li
Cheuk Ting Li and Ayfer \"Ozg\"ur
Channel Diversity needed for Vector Space Interference Alignment
22 pages, 4 figures. Presented in part at the IEEE International Symposium on Information Theory, Honolulu, USA, June 2014. Published in IEEE Transactions on Information Theory (Volume: 62, Issue: 4, April 2016)
IEEE Transactions on Information Theory (Volume: 62, Issue: 4, April 2016)
10.1109/TIT.2016.2529844
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider vector space interference alignment strategies over the $K$-user interference channel and derive an upper bound on the achievable degrees of freedom as a function of the channel diversity $L$, where the channel diversity is modeled by $L$ real-valued parallel channels with coefficients drawn from a non-degenerate joint distribution. The seminal work of Cadambe and Jafar shows that when $L$ is unbounded, vector space interference alignment can achieve $1/2$ degrees of freedom per user independent of the number of users $K$. However wireless channels have limited diversity in practice, dictated by their coherence time and bandwidth, and an important question is the number of degrees of freedom achievable at finite $L$. When $K=3$ and if $L$ is finite, Bresler et al show that the number of degrees of freedom achievable with vector space interference alignment is bounded away from $1/2$, and the gap decreases inversely proportional to $L$. In this paper, we show that when $K\geq4$, the gap is significantly larger. In particular, the gap to the optimal $1/2$ degrees of freedom per user can decrease at most like $1/\sqrt{L}$, and when $L$ is smaller than the order of $2^{(K-2)(K-3)}$, it decays at most like $1/\sqrt[4]{L}$.
[ { "created": "Fri, 21 Feb 2014 15:39:29 GMT", "version": "v1" }, { "created": "Wed, 26 Nov 2014 23:51:17 GMT", "version": "v2" }, { "created": "Tue, 1 Sep 2015 02:14:20 GMT", "version": "v3" }, { "created": "Wed, 7 Sep 2016 09:54:53 GMT", "version": "v4" } ]
2016-09-08
[ [ "Li", "Cheuk Ting", "" ], [ "Özgür", "Ayfer", "" ] ]
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1402.5329
Thierry Lahaye
Florence Nogrette, Henning Labuhn, Sylvain Ravets, Daniel Barredo, Lucas B\'eguin, Aline Vernier, Thierry Lahaye, Antoine Browaeys
Single-atom trapping in holographic 2D arrays of microtraps with arbitrary geometries
9 pages, 10 figures
Phys. Rev. X 4, 021034 (2014)
10.1103/PhysRevX.4.021034
null
physics.atom-ph cond-mat.quant-gas quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We demonstrate single-atom trapping in two-dimensional arrays of microtraps with arbitrary geometries. We generate the arrays using a Spatial Light Modulator (SLM), with which we imprint an appropriate phase pattern on an optical dipole trap beam prior to focusing. We trap single $^{87}{\rm Rb}$ atoms in the sites of arrays containing up to $\sim100$ microtraps separated by distances as small as $3\;\mu$m, with complex structures such as triangular, honeycomb or kagome lattices. Using a closed-loop optimization of the uniformity of the trap depths ensures that all trapping sites are equivalent. This versatile system opens appealing applications in quantum information processing and quantum simulation, e.g. for simulating frustrated quantum magnetism using Rydberg atoms.
[ { "created": "Fri, 21 Feb 2014 15:46:16 GMT", "version": "v1" } ]
2014-05-27
[ [ "Nogrette", "Florence", "" ], [ "Labuhn", "Henning", "" ], [ "Ravets", "Sylvain", "" ], [ "Barredo", "Daniel", "" ], [ "Béguin", "Lucas", "" ], [ "Vernier", "Aline", "" ], [ "Lahaye", "Thierry", "" ], [ "Browaeys", "Antoine", "" ] ]
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1402.5339
Maria Paola Santisi D'Avila
Mauro Schulz, Maria Paola Santisi D'Avila (JAD)
Analysis of reinforced concrete beams by the equivalent section method
2011 FIB Symposium, Czech Republic (2011)
null
10.1002/suco.201190012
null
physics.class-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This research investigates the analysis of reinforced concrete beams subjected to combined axial load, bending moment and shear force. Cross-sections of general shape are divided, along the height, into plane elements. The biaxial behavior is represented according to the smeared rotating crack approach. Using traditionally accepted hypotheses for beams, the shear flow is determined by applying the Jouravski formula to an "equivalent section", which takes into account the nonlinear material behavior. The "Equivalent Section Method", originally proposed by Diaz (1980) and Diaz and Schulz (1981), is improved and simplified. The formulation is implemented applying the bidimensional constitutive model A, proposed by Vecchio and Collins (1993). The tension-stiffening effect is considered as adopted by Polak and Vecchio (1993). Shear slip at crack surfaces, Poisson's ratio and other secondary effects are not considered. Validation is undertaken by comparison with experimental results obtained by other researchers. The examples include reinforced and prestressed concrete beams, for normal and high strength concrete. The formulation satisfactorily predicts the ultimate capacity under different load combinations. The whole set of equilibrium, compatibility and constitutive equations are satisfied, the stiffness derivatives are explicitly calculated and the algorithms show good convergence.
[ { "created": "Mon, 10 Feb 2014 07:17:23 GMT", "version": "v1" } ]
2014-02-24
[ [ "Schulz", "Mauro", "", "JAD" ], [ "D'Avila", "Maria Paola Santisi", "", "JAD" ] ]
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1402.5350
Celso de Araujo Duarte
Celso de Araujo Duarte
The classical geometrization of the electromagnetism
17 pages, no figures
International Journal of Geometric Methods in Modern Physics, 2015
10.1142/S0219887815600221
null
physics.gen-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Following the line of the history, if by one side the electromagnetic theory was consolidated on the 19th century, the emergence of the special and the general relativity theories on the 20th century opened possibilities of further developments, with the search for the unification of the gravitation and the electromagnetism on a single unified theory. Some attempts to the geometrization of the electromagnetism emerged in this context, where these first models resided strictly on a classical basis. Posteriorly, they were followed by more complete and embracing quantum field theories. The present work reconsiders the classical viewpoint, with the purpose of showing that at first order of approximation the electromagnetism constitutes a geometric structure aside other phenomena as gravitation, and that magnetic monopoles do not exist at least up to this order of approximation. Even though being limited, the model is consistent and offers the possibility of an experimental test of validity.
[ { "created": "Wed, 29 Jan 2014 23:07:58 GMT", "version": "v1" }, { "created": "Mon, 10 Mar 2014 02:08:37 GMT", "version": "v2" }, { "created": "Wed, 11 Feb 2015 01:43:12 GMT", "version": "v3" }, { "created": "Mon, 6 Jul 2015 16:34:12 GMT", "version": "v4" }, { "created": "Thu, 13 Aug 2015 20:23:25 GMT", "version": "v5" } ]
2019-11-14
[ [ "Duarte", "Celso de Araujo", "" ] ]
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1402.5351
Jian-Jun Shu
Jian-Jun Shu
On generalized Tian Ji's horse racing strategy
null
Interdisciplinary Science Reviews, Vol. 37, No. 2, pp. 187-193, 2012
10.1179/0308018812Z.00000000014
null
cs.GT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Tian Ji's horse racing strategy, a famous Chinese legend, constitutes a promising concept to be applied to important issues in today's competitive environment; this strategy is elaborated on and analyzed by examining the general case. The mathematical formulation concerning the calculation of winning, drawing or losing combinations and probabilities is presented to illustrate the interesting insights on how ancient philosophies could promote thinking in business competitiveness, in particular, the wisdom behind sacrificing the part for the benefit of the whole or sacrificing the short-term objectives in order to gain the long-term goal.
[ { "created": "Fri, 21 Feb 2014 17:01:23 GMT", "version": "v1" }, { "created": "Fri, 28 Feb 2014 14:38:20 GMT", "version": "v2" }, { "created": "Mon, 24 Apr 2017 17:37:43 GMT", "version": "v3" } ]
2017-04-25
[ [ "Shu", "Jian-Jun", "" ] ]
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1402.5358
J\'anos P\'anovics
Tam\'as K\'adek and J\'anos P\'anovics
Extended Breadth-First Search Algorithm
5 pages, 1 figure, 1 table
International Journal of Computer Science Issues, Volume 10, Issue 6, No 2, ISSN (Print): 1694-0814, ISSN (Online): 1694-0784, November 2013, pp. 78-82
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cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The task of artificial intelligence is to provide representation techniques for describing problems, as well as search algorithms that can be used to answer our questions. A widespread and elaborated model is state-space representation, which, however, has some shortcomings. Classical search algorithms are not applicable in practice when the state space contains even only a few tens of thousands of states. We can give remedy to this problem by defining some kind of heuristic knowledge. In case of classical state-space representation, heuristic must be defined so that it qualifies an arbitrary state based on its "goodness," which is obviously not trivial. In our paper, we introduce an algorithm that gives us the ability to handle huge state spaces and to use a heuristic concept which is easier to embed into search algorithms.
[ { "created": "Fri, 21 Feb 2014 17:21:52 GMT", "version": "v1" } ]
2014-02-24
[ [ "Kádek", "Tamás", "" ], [ "Pánovics", "János", "" ] ]
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1402.5359
Parthajit Mohapatra
Parthajit Mohapatra and Chandra R. Murthy
On the Capacity of the 2-User Interference Channel with Transmitter Cooperation and Secrecy Constraints
77 pages, part of it has been accepted for publication in SPAWC 2013 and NCC 2014. Accepted, IEEE Transactions on Information Theory, May 2016
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper studies the value of limited rate cooperation between the transmitters for managing interference and simultaneously ensuring secrecy, in the 2-user Gaussian symmetric interference channel (GSIC). First, the problem is studied in the symmetric linear deterministic IC (SLDIC) setting, and achievable schemes are proposed, based on interference cancelation, relaying of the other user's data bits, and transmission of random bits. In the proposed achievable scheme, the limited rate cooperative link is used to share a combination of data bits and random bits depending on the model parameters. Outer bounds on the secrecy rate are also derived, using a novel partitioning of the encoded messages and outputs depending on the relative strength of the signal and the interference. The inner and outer bounds are derived under all possible parameter settings. It is found that, for some parameter settings, the inner and outer bounds match, yielding the capacity of the SLDIC under transmitter cooperation and secrecy constraints. In some other scenarios, the achievable rate matches with the capacity region of the 2-user SLDIC without secrecy constraints derived by Wang and Tse [1]; thus, the proposed scheme offers secrecy for free, in these cases. Inspired by the achievable schemes and outer bounds in the deterministic case, achievable schemes and outer bounds are derived in the Gaussian case. The proposed achievable scheme for the Gaussian case is based on Marton's coding scheme and stochastic encoding along with dummy message transmission. One of the key techniques used in the achievable scheme for both the models is interference cancelation, which simultaneously offers two seemingly conflicting benefits: it cancels interference and ensures secrecy. Many of the results derived in this paper extend to the asymmetric case also.
[ { "created": "Fri, 21 Feb 2014 17:23:35 GMT", "version": "v1" }, { "created": "Tue, 16 Sep 2014 12:53:38 GMT", "version": "v2" }, { "created": "Mon, 13 Jun 2016 09:35:14 GMT", "version": "v3" } ]
2016-06-14
[ [ "Mohapatra", "Parthajit", "" ], [ "Murthy", "Chandra R.", "" ] ]
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1402.5360
Chanabasayya Vastrad M
Doreswamy, Chanabasayya M. Vastrad
Important Molecular Descriptors Selection Using Self Tuned Reweighted Sampling Method for Prediction of Antituberculosis Activity
published 2013
null
null
null
cs.LG stat.AP stat.ML
http://creativecommons.org/licenses/by/3.0/
In this paper, a new descriptor selection method for selecting an optimal combination of important descriptors of sulfonamide derivatives data, named self tuned reweighted sampling (STRS), is developed. descriptors are defined as the descriptors with large absolute coefficients in a multivariate linear regression model such as partial least squares(PLS). In this study, the absolute values of regression coefficients of PLS model are used as an index for evaluating the importance of each descriptor Then, based on the importance level of each descriptor, STRS sequentially selects N subsets of descriptors from N Monte Carlo (MC) sampling runs in an iterative and competitive manner. In each sampling run, a fixed ratio (e.g. 80%) of samples is first randomly selected to establish a regresson model. Next, based on the regression coefficients, a two-step procedure including rapidly decreasing function (RDF) based enforced descriptor selection and self tuned sampling (STS) based competitive descriptor selection is adopted to select the important descriptorss. After running the loops, a number of subsets of descriptors are obtained and root mean squared error of cross validation (RMSECV) of PLS models established with subsets of descriptors is computed. The subset of descriptors with the lowest RMSECV is considered as the optimal descriptor subset. The performance of the proposed algorithm is evaluated by sulfanomide derivative dataset. The results reveal an good characteristic of STRS that it can usually locate an optimal combination of some important descriptors which are interpretable to the biologically of interest. Additionally, our study shows that better prediction is obtained by STRS when compared to full descriptor set PLS modeling, Monte Carlo uninformative variable elimination (MC-UVE).
[ { "created": "Fri, 21 Feb 2014 17:24:53 GMT", "version": "v1" } ]
2014-02-24
[ [ "Doreswamy", "", "" ], [ "Vastrad", "Chanabasayya M.", "" ] ]
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