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1402.2810
Georgios Zois
Evripidis Bampis, Vincent Chau, Dimitrios Letsios, Giorgio Lucarelli, Ioannis Milis and Georgios Zois
Energy Efficient Scheduling of MapReduce Jobs
22 pages
null
null
null
cs.DC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
MapReduce is emerged as a prominent programming model for data-intensive computation. In this work, we study power-aware MapReduce scheduling in the speed scaling setting first introduced by Yao et al. [FOCS 1995]. We focus on the minimization of the total weighted completion time of a set of MapReduce jobs under a given budget of energy. Using a linear programming relaxation of our problem, we derive a polynomial time constant-factor approximation algorithm. We also propose a convex programming formulation that we combine with standard list scheduling policies, and we evaluate their performance using simulations.
[ { "created": "Wed, 12 Feb 2014 13:16:16 GMT", "version": "v1" } ]
2014-02-13
[ [ "Bampis", "Evripidis", "" ], [ "Chau", "Vincent", "" ], [ "Letsios", "Dimitrios", "" ], [ "Lucarelli", "Giorgio", "" ], [ "Milis", "Ioannis", "" ], [ "Zois", "Georgios", "" ] ]
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1402.2811
Thomas Philbin
T.G. Philbin
Making geometrical optics exact
5 pages
J. Mod. Opt. 61 (2014) 552
10.1080/09500340.2014.899646
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Geometrical optics (GO) is widely used in studies of electromagnetic materials because of its ease of use compared to full-wave numerical simulations. Exact solutions for waves can, however, differ significantly from the GO approximation. In particular, effects that are "perfect" for waves cannot usually be derived using GO. Here we give a method for designing materials in which GO is exact for some waves. This enables us to find interesting analytical solutions for exact wave propagation in inhomogeneous media. Two examples of the technique are given: a material in which two point sources do not interfere, and a perfect isotropic cloak for waves from a point source. We also give the form of material response required for GO to be exact for all waves.
[ { "created": "Wed, 12 Feb 2014 13:19:39 GMT", "version": "v1" } ]
2015-06-18
[ [ "Philbin", "T. G.", "" ] ]
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1402.2812
Salman Parsa
Salman Parsa
Algorithms for Dynamic Reeb Graphs
There was a problem with the argument used in the original submission. It seems that the truly dynamic nature of the problem puts it in the category of problems such as dynamic graph connectivity that do not have known poly-logarithmic algorihtms. To see the claims in the abstract and a reduction of the problem to a dynamic graph problem refer to my PhD thesis
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null
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cs.CG cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present an algorithm for updating the Reeb graph under fully dynamic changes of the function values. The basic event is the interchange of two consecutive vertex values. The algorithm updates the Reeb graph in $O(l g{n})$ worst-case deterministic time for each such interchange, where $l$ is an upper bound on the size of the star of the involved vertices, and g(n) is a worst-case bound for the dynamic graph connectivity problem. Moreover, we argue that $O(l)$ is a lower bound for this operation in general.
[ { "created": "Wed, 12 Feb 2014 13:21:27 GMT", "version": "v1" }, { "created": "Tue, 18 Mar 2014 15:44:14 GMT", "version": "v2" }, { "created": "Fri, 17 Jul 2015 12:07:00 GMT", "version": "v3" } ]
2015-07-20
[ [ "Parsa", "Salman", "" ] ]
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1402.2814
Eric Voutier
Eric Voutier
Physics perspectives at JLab with a polarized positron beam
Proc. of MENU 2013, XIIIrd International Conference on Meson-Nucleon Physics and the Structure of the Nucleon, Rome (Italy), September 30 - October 4, 2013 (To appear in EPJ Web of Conferences)
null
10.1051/epjconf/20147308007
null
physics.acc-ph hep-ex nucl-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Polarized positron beams are in some respect mandatory complements to polarized electron beams. The advent of the PEPPo concept for polarized positron production opens the possibility for the developement at the Jefferson Laboratory of a continuous polarized positron beam. The benefits of such a beam for hadronic structure studies are discussed, together with the technical and technological challenges to face.
[ { "created": "Wed, 12 Feb 2014 13:42:25 GMT", "version": "v1" } ]
2015-06-18
[ [ "Voutier", "Eric", "" ] ]
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1402.2819
Luca Tubiana Ph.D.
Luca Tubiana
On the factorization of composite polymer knots into separated prime components
13 pages, 11 Figures
null
10.1103/PhysRevE.89.052602
null
cond-mat.stat-mech physics.comp-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Using Monte Carlo simulations and advanced knot localization methods, we analyze the length and distribution of prime components in composite knots tied on Freely Jointed Rings (FJRs). For increasing contour length, we observe the progressive factorization of composite knots into separated prime components. However, we observe that a complete factorization, equivalent to the "decorated ring" picture, is not obtained even for rings of contour lengths $N\simeq 3N_0$, about tens of times the most probable length of the prime knots tied on the rings. The decorated ring hypothesis has been used in literature to justify the factorization of composite knots probabilities into the knotting probabilities of their prime components. Following our results, we suggest that such hypothesis may not be necessary to explain the factorization of the knotting probabilities, at least when polymers excluded volume is not relevant. We rationalize the behavior of the system through a simple one dimensional model in which prime knots are replaced by sliplinks randomly placed on a circle, with the only constraint that the length of the loops has the same distribution of the length of the corresponding prime knots.
[ { "created": "Wed, 12 Feb 2014 13:49:31 GMT", "version": "v1" } ]
2015-06-18
[ [ "Tubiana", "Luca", "" ] ]
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1402.2826
Aniket Bera
Aniket Bera and Dinesh Manocha
Realtime Multilevel Crowd Tracking using Reciprocal Velocity Obstacles
null
null
null
null
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a novel, realtime algorithm to compute the trajectory of each pedestrian in moderately dense crowd scenes. Our formulation is based on an adaptive particle filtering scheme that uses a multi-agent motion model based on velocity-obstacles, and takes into account local interactions as well as physical and personal constraints of each pedestrian. Our method dynamically changes the number of particles allocated to each pedestrian based on different confidence metrics. Additionally, we use a new high-definition crowd video dataset, which is used to evaluate the performance of different pedestrian tracking algorithms. This dataset consists of videos of indoor and outdoor scenes, recorded at different locations with 30-80 pedestrians. We highlight the performance benefits of our algorithm over prior techniques using this dataset. In practice, our algorithm can compute trajectories of tens of pedestrians on a multi-core desktop CPU at interactive rates (27-30 frames per second). To the best of our knowledge, our approach is 4-5 times faster than prior methods, which provide similar accuracy.
[ { "created": "Tue, 11 Feb 2014 15:49:53 GMT", "version": "v1" } ]
2014-02-13
[ [ "Bera", "Aniket", "" ], [ "Manocha", "Dinesh", "" ] ]
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1402.2827
Carlos Gershenson
Carlos Gershenson
Harnessing the Complexity of Education with Information Technology
5 pages, 2 figures. Commentary
Complexity, 20(5):13-16. 2015
10.1002/cplx.21536
null
cs.CY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Education at all levels is facing several challenges in most countries, such as low quality, high costs, lack of educators, and unsatisfied student demand. Traditional approaches are becoming unable to deliver the required education. Several causes for this inefficiency can be identified. I argue that beyond specific causes, the lack of effective education is related to complexity. However, information technology is helping us overcome this complexity.
[ { "created": "Mon, 10 Feb 2014 22:44:41 GMT", "version": "v1" } ]
2016-04-01
[ [ "Gershenson", "Carlos", "" ] ]
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1402.2830
Mikael Rechtsman
D. Guzman-Silva, C. Mejia-Cortes, M.A. Bandres, M.C. Rechtsman, S. Weimann, S. Nolte, M. Segev, A. Szameit, and R. A. Vicencio
Experimental observation of bulk and edge transport in photonic Lieb lattices
8 pages; 4 figures
New Journal of Physics 16 (2014) 063061
10.1088/1367-2630/16/6/063061
null
physics.optics cond-mat.mes-hall
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We analyze the transport of light in the bulk and at the edge of photonic Lieb lattices, whose unique feature is the existence of a flat band representing stationary states in the middle of the band structure that can form localized bulk states. We find that transport in bulk Lieb lattices is significantly affected by the particular excitation site within the unit cell, due to overlap with the flat band states. Additionally, we demonstrate the existence of new edge states in anisotropic Lieb lattices. These states arise due to a virtual defect at the lattice edges and are not described by the standard tight-binding model.
[ { "created": "Wed, 12 Feb 2014 14:22:51 GMT", "version": "v1" } ]
2018-09-03
[ [ "Guzman-Silva", "D.", "" ], [ "Mejia-Cortes", "C.", "" ], [ "Bandres", "M. A.", "" ], [ "Rechtsman", "M. C.", "" ], [ "Weimann", "S.", "" ], [ "Nolte", "S.", "" ], [ "Segev", "M.", "" ], [ "Szameit", "A.", "" ], [ "Vicencio", "R. A.", "" ] ]
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1402.2833
Sarah Becker
Sarah Becker, Bethany A. Frew, Gorm B. Andresen, Timo Zeyer, Stefan Schramm, Martin Greiner, Mark Z. Jacobson
Features of a fully renewable US electricity system: Optimized mixes of wind and solar PV and transmission grid extensions
19 pages, 18 figures
Energy 72, 443-458 (Aug 2014)
10.1016/j.energy.2014.05.067
null
physics.soc-ph cond-mat.dis-nn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Wind and solar PV generation data for the entire contiguous US are calculated, on the basis of 32 years of weather data with temporal resolution of one hour and spatial resolution of 40x40km$^2$, assuming site-suitability-based as well as stochastic wind and solar PV capacity distributions throughout the country. These data are used to investigate a fully renewable electricity system, resting primarily upon wind and solar PV power. We find that the seasonal optimal mix of wind and solar PV comes at around 80% solar PV share, owing to the US summer load peak. By picking this mix, long-term storage requirements can be more than halved compared to a wind only mix. The daily optimal mix lies at about 80% wind share due to the nightly gap in solar PV production. Picking this mix instead of solar only reduces backup energy needs by about 50%. Furthermore, we calculate shifts in FERC (Federal Energy Regulatory Commission)-level LCOE (Levelized Costs Of Electricity) for wind and solar PV due to their differing resource quality and fluctuation patterns. LCOE vary by up to 35% due to regional conditions, and LCOE-optimal mixes turn out to largely follow resource quality. A transmission network enhancement among FERC regions is constructed to transfer high penetrations of solar and wind across FERC boundaries, based on a novel least-cost optimization approach.
[ { "created": "Wed, 12 Feb 2014 14:28:35 GMT", "version": "v1" } ]
2014-07-29
[ [ "Becker", "Sarah", "" ], [ "Frew", "Bethany A.", "" ], [ "Andresen", "Gorm B.", "" ], [ "Zeyer", "Timo", "" ], [ "Schramm", "Stefan", "" ], [ "Greiner", "Martin", "" ], [ "Jacobson", "Mark Z.", "" ] ]
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1402.2836
Martin Erdmann H
Martin Erdmann, Robert Fischer, Christian Glaser, Dennis Klingebiel, Raphael Krause, Daniel Kuempel, Gero Mueller, Marcel Rieger, Jan Steggemann, Martin Urban, David Walz, Klaus Weidenhaupt, Tobias Winchen, Birgitta Weltermann
A field study of data analysis exercises in a bachelor physics course using the internet platform VISPA
21 pages, 8 figures, 1 table, for the internet platform VISPA see http://vispa.physik.rwth-aachen.de
Eur. J. Phys. 35 (2014) 035018
10.1088/0143-0807/35/3/035018
null
physics.ed-ph astro-ph.HE hep-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Bachelor physics lectures on particle physics and astrophysics were complemented by exercises related to data analysis and data interpretation at the RWTH Aachen University recently. The students performed these exercises using the internet platform VISPA, which provides a development environment for physics data analyses. We describe the platform and its application within the physics course, and present the results of a student survey. The students acceptance of the learning project was positive. The level of acceptance was related to their individual preference for learning with a computer. Furthermore, students with good programming skills favor working individually, while students who attribute themselves having low programming abilities favor working in teams. The students appreciated approaching actual research through the data analysis tasks.
[ { "created": "Wed, 12 Feb 2014 14:31:30 GMT", "version": "v1" } ]
2014-04-08
[ [ "Erdmann", "Martin", "" ], [ "Fischer", "Robert", "" ], [ "Glaser", "Christian", "" ], [ "Klingebiel", "Dennis", "" ], [ "Krause", "Raphael", "" ], [ "Kuempel", "Daniel", "" ], [ "Mueller", "Gero", "" ], [ "Rieger", "Marcel", "" ], [ "Steggemann", "Jan", "" ], [ "Urban", "Martin", "" ], [ "Walz", "David", "" ], [ "Weidenhaupt", "Klaus", "" ], [ "Winchen", "Tobias", "" ], [ "Weltermann", "Birgitta", "" ] ]
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1402.2840
Mahsa Shirmohammadi
Laurent Doyen, Thierry Massart, Mahsa Shirmohammadi
Robust Synchronization in Markov Decision Processes
27 pages, 9 figures, 3 Tables. arXiv admin note: text overlap with arXiv:1310.2935
null
null
null
cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider synchronizing properties of Markov decision processes (MDP), viewed as generators of sequences of probability distributions over states. A probability distribution is p-synchronizing if the probability mass is at least p in some state, and a sequence of probability distributions is weakly p-synchronizing, or strongly p-synchronizing if respectively infinitely many, or all but finitely many distributions in the sequence are p-synchronizing. For each synchronizing mode, an MDP can be (i) sure winning if there is a strategy that produces a 1-synchronizing sequence; (ii) almost-sure winning if there is a strategy that produces a sequence that is, for all {\epsilon} > 0, a (1-{\epsilon})-synchronizing sequence; (iii) limit-sure winning if for all {\epsilon} > 0, there is a strategy that produces a (1-{\epsilon})-synchronizing sequence. For each synchronizing and winning mode, we consider the problem of deciding whether an MDP is winning, and we establish matching upper and lower complexity bounds of the problems, as well as the optimal memory requirement for winning strategies: (a) for all winning modes, we show that the problems are PSPACE-complete for weakly synchronizing, and PTIME-complete for strongly synchronizing; (b) we show that for weakly synchronizing, exponential memory is sufficient and may be necessary for sure winning, and infinite memory is necessary for almost-sure winning; for strongly synchronizing, linear-size memory is sufficient and may be necessary in all modes; (c) we show a robustness result that the almost-sure and limit-sure winning modes coincide for both weakly and strongly synchronizing.
[ { "created": "Wed, 12 Feb 2014 14:47:05 GMT", "version": "v1" }, { "created": "Fri, 18 Apr 2014 17:00:26 GMT", "version": "v2" }, { "created": "Mon, 30 Jun 2014 15:42:47 GMT", "version": "v3" } ]
2014-07-01
[ [ "Doyen", "Laurent", "" ], [ "Massart", "Thierry", "" ], [ "Shirmohammadi", "Mahsa", "" ] ]
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1402.2843
Edouard Bonnet
Edouard Bonnet and Vangelis Th. Paschos
Sparsification and subexponential approximation
16 pages
null
null
null
cs.CC cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Instance sparsification is well-known in the world of exact computation since it is very closely linked to the Exponential Time Hypothesis. In this paper, we extend the concept of sparsification in order to capture subexponential time approximation. We develop a new tool for inapproximability, called approximation preserving sparsification and use it in order to get strong inapproximability results in subexponential time for several fundamental optimization problems as Max Independent Set, Min Dominating Set, Min Feedback Vertex Set, and Min Set Cover.
[ { "created": "Wed, 12 Feb 2014 15:07:50 GMT", "version": "v1" }, { "created": "Fri, 14 Feb 2014 17:35:33 GMT", "version": "v2" } ]
2014-02-17
[ [ "Bonnet", "Edouard", "" ], [ "Paschos", "Vangelis Th.", "" ] ]
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1402.2845
Alex Gorodetsky
Alex A. Gorodetsky, Youssef M. Marzouk
Efficient Localization of Discontinuities in Complex Computational Simulations
null
null
null
null
cs.CE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Surrogate models for computational simulations are input-output approximations that allow computationally intensive analyses, such as uncertainty propagation and inference, to be performed efficiently. When a simulation output does not depend smoothly on its inputs, the error and convergence rate of many approximation methods deteriorate substantially. This paper details a method for efficiently localizing discontinuities in the input parameter domain, so that the model output can be approximated as a piecewise smooth function. The approach comprises an initialization phase, which uses polynomial annihilation to assign function values to different regions and thus seed an automated labeling procedure, followed by a refinement phase that adaptively updates a kernel support vector machine representation of the separating surface via active learning. The overall approach avoids structured grids and exploits any available simplicity in the geometry of the separating surface, thus reducing the number of model evaluations required to localize the discontinuity. The method is illustrated on examples of up to eleven dimensions, including algebraic models and ODE/PDE systems, and demonstrates improved scaling and efficiency over other discontinuity localization approaches.
[ { "created": "Wed, 12 Feb 2014 15:16:11 GMT", "version": "v1" }, { "created": "Mon, 4 Aug 2014 18:06:35 GMT", "version": "v2" } ]
2014-08-05
[ [ "Gorodetsky", "Alex A.", "" ], [ "Marzouk", "Youssef M.", "" ] ]
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1402.2852
Shmuel Onn
Shmuel Onn
Robust Integer Programming
null
Operations Research Letters, 42:558-560, 2014
null
null
math.OC cs.DM cs.DS math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We provide a complexity classification of four variants of robust integer programming when the underlying Graver basis is given. We discuss applications to robust multicommodity flows and multidimensional transportation, and describe an effective parametrization of robust integer programming.
[ { "created": "Wed, 12 Feb 2014 15:34:21 GMT", "version": "v1" }, { "created": "Thu, 13 Feb 2014 08:45:47 GMT", "version": "v2" } ]
2014-11-04
[ [ "Onn", "Shmuel", "" ] ]
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1402.2861
Manuel Fiolhais
Julio G\"u\'emez and Manuel Fiolhais
From mechanics to thermodynamics -- analysis of selected examples
15 pages, 5 figures
European Journal of Physics 34 (2013) 345-357
10.1088/0143-0807/34/2/345
null
physics.class-ph physics.ed-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present and discuss a selected set of problems of classical mechanics and thermodynamics. The discussion is based on the use of the impulse-momentum equation simultaneously with the centre-of-mass (pseudo-work) equation or with the first law of thermodynamics, depending on the nature of the problem. Thermodynamical aspects of classical mechanics, namely problems involving non-conservative forces or variation of mechanical energy are discussed, in different reference frames, in connection with the use of one or the other energy equation, and with the compliance of the Principle of Relativity.
[ { "created": "Tue, 11 Feb 2014 16:50:34 GMT", "version": "v1" } ]
2014-02-17
[ [ "Güémez", "Julio", "" ], [ "Fiolhais", "Manuel", "" ] ]
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1402.2863
Liang Dai
Liang Dai, Mojtaba Soltanalian, Kristiaan Pelckmans
On the Randomized Kaczmarz Algorithm
This paper will appear in IEEE Signal processing letters, vol. 21, no. 3, March 2014
null
10.1109/LSP.2013.2294376
null
cs.SY math.OC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Randomized Kaczmarz Algorithm is a randomized method which aims at solving a consistent system of over determined linear equations. This note discusses how to find an optimized randomization scheme for this algorithm, which is related to the question raised by \cite{c2}. Illustrative experiments are conducted to support the findings.
[ { "created": "Wed, 12 Feb 2014 16:01:50 GMT", "version": "v1" } ]
2016-11-17
[ [ "Dai", "Liang", "" ], [ "Soltanalian", "Mojtaba", "" ], [ "Pelckmans", "Kristiaan", "" ] ]
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1402.2864
Liang Dai
Liang Dai, Kristiaan Pelckmans
Sparse Estimation From Noisy Observations of an Overdetermined Linear System
This paper is provisionally accepted by Automatica
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null
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cs.SY stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This note studies a method for the efficient estimation of a finite number of unknown parameters from linear equations, which are perturbed by Gaussian noise. In case the unknown parameters have only few nonzero entries, the proposed estimator performs more efficiently than a traditional approach. The method consists of three steps: (1) a classical Least Squares Estimate (LSE), (2) the support is recovered through a Linear Programming (LP) optimization problem which can be computed using a soft-thresholding step, (3) a de-biasing step using a LSE on the estimated support set. The main contribution of this note is a formal derivation of an associated ORACLE property of the final estimate. That is, when the number of samples is large enough, the estimate is shown to equal the LSE based on the support of the {\em true} parameters.
[ { "created": "Wed, 12 Feb 2014 16:02:43 GMT", "version": "v1" }, { "created": "Sun, 25 May 2014 18:44:04 GMT", "version": "v2" } ]
2014-05-27
[ [ "Dai", "Liang", "" ], [ "Pelckmans", "Kristiaan", "" ] ]
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1402.2867
Natalie Kerracher
Natalie Kerracher, Jessie Kennedy, and Kevin Chalmers
Tasks for Temporal Graph Visualisation
42 pages
null
null
null
cs.OH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In [1], we describe the design and development of a task taxonomy for temporal graph visualisation. This paper details the full instantiation of that task taxonomy. Our task taxonomy is based on the Andrienko framework [2], which uses a systematic approach to develop a formal task framework for visual tasks specifically associated with Exploratory Data Analysis. The Andrienko framework is intended to be applicable to all types of data, however, it does not consider relational (graph) data. We therefore extended both their data model and task framework for temporal graph data, and instantiated the extended version to produce a comprehensive list of tasks of interest during exploratory analysis of temporal graph data. As expected, our instantiation of the framework resulted in a very large task list; with more than 144 variations of attribute based tasks alone, it is too large to fit in a standard journal paper, hence we provide the detailed listing in this document.
[ { "created": "Mon, 10 Feb 2014 09:54:05 GMT", "version": "v1" } ]
2014-02-13
[ [ "Kerracher", "Natalie", "" ], [ "Kennedy", "Jessie", "" ], [ "Chalmers", "Kevin", "" ] ]
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1402.2871
Christopher Amato
Christopher Amato and George D. Konidaris and Gabriel Cruz and Christopher A. Maynor and Jonathan P. How and Leslie P. Kaelbling
Planning for Decentralized Control of Multiple Robots Under Uncertainty
null
null
null
null
cs.RO cs.AI cs.MA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We describe a probabilistic framework for synthesizing control policies for general multi-robot systems, given environment and sensor models and a cost function. Decentralized, partially observable Markov decision processes (Dec-POMDPs) are a general model of decision processes where a team of agents must cooperate to optimize some objective (specified by a shared reward or cost function) in the presence of uncertainty, but where communication limitations mean that the agents cannot share their state, so execution must proceed in a decentralized fashion. While Dec-POMDPs are typically intractable to solve for real-world problems, recent research on the use of macro-actions in Dec-POMDPs has significantly increased the size of problem that can be practically solved as a Dec-POMDP. We describe this general model, and show how, in contrast to most existing methods that are specialized to a particular problem class, it can synthesize control policies that use whatever opportunities for coordination are present in the problem, while balancing off uncertainty in outcomes, sensor information, and information about other agents. We use three variations on a warehouse task to show that a single planner of this type can generate cooperative behavior using task allocation, direct communication, and signaling, as appropriate.
[ { "created": "Wed, 12 Feb 2014 16:13:16 GMT", "version": "v1" } ]
2014-02-13
[ [ "Amato", "Christopher", "" ], [ "Konidaris", "George D.", "" ], [ "Cruz", "Gabriel", "" ], [ "Maynor", "Christopher A.", "" ], [ "How", "Jonathan P.", "" ], [ "Kaelbling", "Leslie P.", "" ] ]
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1402.2873
Jin-Han Xie
Jin-Han Xie and Jacques Vanneste
Boundary streaming with Navier boundary condition
11 pages, 3 figures
Phys. Rev. E 89, 063010 (2014)
10.1103/PhysRevE.89.063010
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In microfluidic applications involving high-frequency acoustic waves over a solid boundary, the Stokes boundary-layer thickness $\delta$ is so small that some non-negligible slip may occur at the fluid-solid interface. This paper assesses the impact of the slip by revisiting the classical problem of steady acoustic streaming over a flat boundary with the Navier boundary condition $u|_{y=0} = L_\mathrm{s} \partial_y u|_{y=0}$, where $u$ is the velocity tangent to the boundary $y=0$, and the parameter $L_\mathrm{s}$ is the slip length. The limit outside the boundary layer provide an effective slip velocity. A general expression is obtained for the streaming velocity outside the boundary layer as a function of the dimensionless parameter $L_\mathrm{s}/\delta$. Particularising to travelling and standing waves shows that the boundary slip respectively increases and decreases the streaming velocity.
[ { "created": "Wed, 12 Feb 2014 16:18:16 GMT", "version": "v1" }, { "created": "Fri, 14 Feb 2014 17:49:37 GMT", "version": "v2" }, { "created": "Tue, 29 Apr 2014 12:37:41 GMT", "version": "v3" }, { "created": "Tue, 24 Jun 2014 18:20:19 GMT", "version": "v4" } ]
2014-06-25
[ [ "Xie", "Jin-Han", "" ], [ "Vanneste", "Jacques", "" ] ]
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1402.2874
Maria Paola Santisi D'Avila
Maria Paola Santisi D'Avila (JAD), Luca Lenti (IFSTTAR/GERS/SV), Jean-Fran\c{c}ois Semblat (IFSTTAR/GERS/SV), Ali Gandomzadeh (LCPC/MSRGI), Salvatore Martino, Luis Fabian Bonilla
Strong seismic motions estimated from a one direction-three components ("1d-3c") approach, application to the city of rome, italy
5th International Conference on Earthquake Geotechnical Engineering, Chile (2011)
null
null
null
physics.geo-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Strong seismic motions in soils generally lead to both a stiffness reduction and an increase of the energy dissipation in the surficial layers. In order to study such phenomena, several nonlinear constitutive models were proposed and were generally implemented for 1D soil columns. However, one of the main difficulties of complex rheologies is the large number of parameters needed to describe the model. In this sense, the multi-surface cyclic plasticity approach, developed by Iwan in 1967 but linked to Prandtl or Preisach theoretical work, is an interesting choice: the only data needed is the modulus reduction curve. Past studies have generally implemented such models for one-directional shear wave propagation in a "1D" soil column considering one motion component only ("1C"). Conversely, this work aims at studying strong motion amplification by considering seismic wave propagation in a "1D" soil column accounting for the influence of the 3D loading path on the nonlinear behavior of each soil layer. In the "1D-3C" approach, the three components (3C) of the outcrop motion are simultaneously propagated into a horizontally layered soil for which a three-dimensional constitutive relation is used (Finite Element Method). The alluvial site considered in this study corresponds to the Tiber River Valley, close to the historical centre of Rome (Italy). The computations are performed considering the waveforms referred as the 14th October 1997 Umbria-Marche earthquake, recorded on outcropping bedrock. Time histories and stress-strain hysteretic loops are computed all along the soil column. The octahedral stress, the strain-depth profiles and the transfer functions in acceleration (surface/outcrop spectral ratios) are estimated for the 1D-1C and the 1D-3C approaches, evidencing the influence of the three-dimensional loading path.
[ { "created": "Mon, 10 Feb 2014 07:19:31 GMT", "version": "v1" } ]
2014-02-13
[ [ "D'Avila", "Maria Paola Santisi", "", "JAD" ], [ "Lenti", "Luca", "", "IFSTTAR/GERS/SV" ], [ "Semblat", "Jean-François", "", "IFSTTAR/GERS/SV" ], [ "Gandomzadeh", "Ali", "", "LCPC/MSRGI" ], [ "Martino", "Salvatore", "" ], [ "Bonilla", "Luis Fabian", "" ] ]
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1402.2875
Anton Daitche
Anton Daitche and Tam\'as T\'el
Memory effects in chaotic advection of inertial particles
null
New Journal of Physics 16 073008 (2014)
10.1088/1367-2630/16/7/073008
null
physics.flu-dyn nlin.CD
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A systematic investigation of the effect of the history force on particle advection is carried out for both heavy and light particles. General relations are given to identify parameter regions where the history force is expected to be comparable with the Stokes drag. As an illustrative example, a paradigmatic two-dimensional flow, the von K\'arm\'an flow is taken. For small (but not extremely small) particles all investigated dynamical properties turn out to heavily depend on the presence of memory when compared to the memoryless case: the history force generates a rather non-trivial dynamics that appears to weaken (but not to suppress) inertial effects, it enhances the overall contribution of viscosity. We explore the parameter space spanned by the particle size and the density ratio, and find a weaker tendency for accumulation in attractors and for caustics formation. The Lyapunov exponent of transients becomes larger with memory. Periodic attractors are found to have a very slow, $t^{-1/2}$ type convergence towards the asymptotic form. We find that the concept of snapshot attractors is useful to understand this slow convergence: an ensemble of particles converges exponentially fast towards a snapshot attractor, which undergoes a slow shift for long times.
[ { "created": "Wed, 12 Feb 2014 16:19:54 GMT", "version": "v1" }, { "created": "Thu, 24 Jul 2014 11:50:37 GMT", "version": "v2" } ]
2014-07-25
[ [ "Daitche", "Anton", "" ], [ "Tél", "Tamás", "" ] ]
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1402.2879
Robert Heath
Robert M. Heath, Michael G. Tanner, Alessandro Casaburi, Mark G. Webster, Lara San Emeterio Alvarez, Zoe H. Barber, Richard J. Warburton, Robert H. Hadfield
Nano-optical observation of cascade switching in a parallel superconducting nanowire single photon detector
11 pages, 2 figures
Appl. Phys. Lett. 104, 063503 (2014)
10.1063/1.4865199
null
quant-ph cond-mat.supr-con physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The device physics of parallel-wire superconducting nanowire single photon detectors is based on a cascade process. Using nano-optical techniques and a parallel wire device with spatially-separate pixels we explicitly demonstrate the single- and multi-photon triggering regimes. We develop a model for describing efficiency of a detector operating in the arm-trigger regime. We investigate the timing response of the detector when illuminating a single pixel and two pixels. We see a change in the active area of the detector between the two regimes and find the two-pixel trigger regime to have a faster timing response than the one-pixel regime.
[ { "created": "Wed, 12 Feb 2014 16:23:36 GMT", "version": "v1" } ]
2014-02-13
[ [ "Heath", "Robert M.", "" ], [ "Tanner", "Michael G.", "" ], [ "Casaburi", "Alessandro", "" ], [ "Webster", "Mark G.", "" ], [ "Alvarez", "Lara San Emeterio", "" ], [ "Barber", "Zoe H.", "" ], [ "Warburton", "Richard J.", "" ], [ "Hadfield", "Robert H.", "" ] ]
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1402.2880
Anthony Scemama
Anthony Scemama, Nicolas Renon and Mathias Rapacioli
A Sparse SCF algorithm and its parallel implementation: Application to DFTB
13 pages, 11 figures
J. Chem. Theory Comput., 2014, 10 (6), 2344-2354
10.1021/ct500115v
null
physics.chem-ph cs.DC physics.comp-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present an algorithm and its parallel implementation for solving a self consistent problem as encountered in Hartree Fock or Density Functional Theory. The algorithm takes advantage of the sparsity of matrices through the use of local molecular orbitals. The implementation allows to exploit efficiently modern symmetric multiprocessing (SMP) computer architectures. As a first application, the algorithm is used within the density functional based tight binding method, for which most of the computational time is spent in the linear algebra routines (diagonalization of the Fock/Kohn-Sham matrix). We show that with this algorithm (i) single point calculations on very large systems (millions of atoms) can be performed on large SMP machines (ii) calculations involving intermediate size systems (1~000--100~000 atoms) are also strongly accelerated and can run efficiently on standard servers (iii) the error on the total energy due to the use of a cut-off in the molecular orbital coefficients can be controlled such that it remains smaller than the SCF convergence criterion.
[ { "created": "Wed, 12 Feb 2014 16:27:00 GMT", "version": "v1" } ]
2016-07-25
[ [ "Scemama", "Anthony", "" ], [ "Renon", "Nicolas", "" ], [ "Rapacioli", "Mathias", "" ] ]
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1402.2885
Davide Faranda
Davide Faranda and Flavio Maria Emanuele Pons and B\'ereng\`ere Dubrulle
Statistical early-warning indicators based on Auto-Regressive Moving-Average processes
5 pages, 4 figures
null
10.1088/1751-8113/47/25/252001
null
physics.data-an nlin.CD
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We address the problem of defining early warning indicators of critical transition. To this purpose, we fit the relevant time series through a class of linear models, known as Auto-Regressive Moving-Average (ARMA(p,q)) models. We define two indicators representing the total order and the total persistence of the process, linked, respectively, to the shape and to the characteristic decay time of the autocorrelation function of the process. We successfully test the method to detect transitions in a Langevin model and a 2D Ising model with nearest-neighbour interaction. We then apply the method to complex systems, namely for dynamo thresholds and financial crisis detection.
[ { "created": "Wed, 12 Feb 2014 16:36:07 GMT", "version": "v1" } ]
2015-06-18
[ [ "Faranda", "Davide", "" ], [ "Pons", "Flavio Maria Emanuele", "" ], [ "Dubrulle", "Bérengère", "" ] ]
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1402.2887
Maria Paola Santisi D'Avila
Maria Paola Santisi D'Avila (JAD), Luca Lenti (IFSTTAR/GERS/SV), Jean-Fran\c{c}ois Semblat (IFSTTAR/GERS/SV)
Mod\'elisation 1D-3Composantes de la r\'eponse sismique d'une colonne de sol multicouche \`a comportement non lin\'eaire
18th International Conference on Soil Mechanics and Geotechnical Engineering, France (2013)
null
null
null
physics.geo-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose a one-directional three-component (1D-3C) approach to model the unidirectional (1D) propagation of a three component (3C) earthquake for seismic response analyses of horizontal multilayer soils, considering a 3D nonlinear constitutive behaviour for soils. An elasto-plastic cyclic constitutive behaviour of the Masing-Prandtl-Iwan type, using just the shear modulus decay curve for soil characterization, is implemented in a finite element scheme. Seismic response of soil profiles appears dependent on incident wave polarization, elastic and dynamic properties of medium and seismic impedance contrast between soil layers. Propagating a 3C signal induces a multiaxial stress interaction decreasing soil strength and increasing nonlinear effects. Soil profiles in the Tohoku area (Japan) are loaded by seismic signals recorded at outcrops or downhole, during the 2011 Tohoku earthquake. The nonlinear seismic response of each soil profile, represented in terms of acceleration, hysteresis loops and stress and strain profiles with depth, is compared in both cases of superposition of three one-component propagation effects (1D-1C) and 1D-3C.
[ { "created": "Mon, 10 Feb 2014 07:17:54 GMT", "version": "v1" } ]
2014-02-13
[ [ "D'Avila", "Maria Paola Santisi", "", "JAD" ], [ "Lenti", "Luca", "", "IFSTTAR/GERS/SV" ], [ "Semblat", "Jean-François", "", "IFSTTAR/GERS/SV" ] ]
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1402.2889
Vladimir Shelistov
E.A. Demekhin, N.V. Nikitin, V.S. Shelistov
Three-dimensional Coherent Structures of Electrokinetic Instability
null
Phys. Rev. E 90, 013031 (2014)
10.1103/PhysRevE.90.013031
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A direct numerical simulation of the three-dimensional elektrokinetic instability near a charge selective surface (electric membrane, electrode, or system of micro-/nanochannels) is carried out and analyzed. A special finite-difference method was used for the space discretization along with a semi-implicit $3\frac{1}{3}$-step Runge-Kutta scheme for the integration in time. The calculations employed parallel computing. Three characteristic patterns, which correspond to the overlimiting currents, are observed: (a) two-dimensional electroconvective rolls, (b) three-dimensional regular hexagonal structures, and (c) three-dimensional structures of spatiotemporal chaos, which are a combination of unsteady hexagons, quadrangles and triangles. The transition from (b) to (c) is accompanied by the generation of interacting two-dimensional solitary pulses.
[ { "created": "Wed, 12 Feb 2014 16:41:21 GMT", "version": "v1" } ]
2014-08-06
[ [ "Demekhin", "E. A.", "" ], [ "Nikitin", "N. V.", "" ], [ "Shelistov", "V. S.", "" ] ]
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1402.2890
Bei Yu
Bei Yu and Yen-Hung Lin and Gerard Luk-Pat and Duo Ding and Kevin Lucas and David Z. Pan
A High-Performance Triple Patterning Layout Decomposer with Balanced Density
null
null
null
null
cs.AR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Triple patterning lithography (TPL) has received more and more attentions from industry as one of the leading candidate for 14nm/11nm nodes. In this paper, we propose a high performance layout decomposer for TPL. Density balancing is seamlessly integrated into all key steps in our TPL layout decomposition, including density-balanced semi-definite programming (SDP), density-based mapping, and density-balanced graph simplification. Our new TPL decomposer can obtain high performance even compared to previous state-of-the-art layout decomposers which are not balanced-density aware, e.g., by Yu et al. (ICCAD'11), Fang et al. (DAC'12), and Kuang et al. (DAC'13). Furthermore, the balanced-density version of our decomposer can provide more balanced density which leads to less edge placement error (EPE), while the conflict and stitch numbers are still very comparable to our non-balanced-density baseline.
[ { "created": "Wed, 12 Feb 2014 16:43:46 GMT", "version": "v1" } ]
2014-02-13
[ [ "Yu", "Bei", "" ], [ "Lin", "Yen-Hung", "" ], [ "Luk-Pat", "Gerard", "" ], [ "Ding", "Duo", "" ], [ "Lucas", "Kevin", "" ], [ "Pan", "David Z.", "" ] ]
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1402.2892
Thabet Slimani
Thabet Slimani, Amor Lazzez
Efficient Analysis of Pattern and Association Rule Mining Approaches
14 pages, 3 figures. arXiv admin note: text overlap with arXiv:1312.4800; and with arXiv:1109.2427 by other authors
International Journal of Information Technology and Computer Science (IJITCS), vol.6, no.3, pp.70-81, 2014
10.5815/ijitcs.2014.03.09
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cs.DB
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The process of data mining produces various patterns from a given data source. The most recognized data mining tasks are the process of discovering frequent itemsets, frequent sequential patterns, frequent sequential rules and frequent association rules. Numerous efficient algorithms have been proposed to do the above processes. Frequent pattern mining has been a focused topic in data mining research with a good number of references in literature and for that reason an important progress has been made, varying from performant algorithms for frequent itemset mining in transaction databases to complex algorithms, such as sequential pattern mining, structured pattern mining, correlation mining. Association Rule mining (ARM) is one of the utmost current data mining techniques designed to group objects together from large databases aiming to extract the interesting correlation and relation among huge amount of data. In this article, we provide a brief review and analysis of the current status of frequent pattern mining and discuss some promising research directions. Additionally, this paper includes a comparative study between the performance of the described approaches.
[ { "created": "Wed, 12 Feb 2014 16:45:54 GMT", "version": "v1" } ]
2014-02-13
[ [ "Slimani", "Thabet", "" ], [ "Lazzez", "Amor", "" ] ]
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1402.2894
Bei Yu
Bei Yu and Sheqin Dong and Statoshi Goto
Multi-Voltage and Level-Shifter Assignment Driven Floorplanning
null
null
10.1109/ASICON.2009.5351219
null
cs.AR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
As technology scales, low power design has become a significant requirement for SOC designers. Among the existing techniques, Multiple-Supply Voltage (MSV) is a popular and effective method to reduce both dynamic and static power. Besides, level shifters consume area and delay, and should be considered during floorplanning. In this paper, we present a new floorplanning system, called MVLSAF, to solve multi-voltage and level shifter assignment problem. We use a convex cost network flow algorithm to assign arbitrary number of legal working voltages and a minimum cost flow algorithm to handle level-shifter assignment. The experimental results show MVLSAF is effective.
[ { "created": "Wed, 12 Feb 2014 16:55:10 GMT", "version": "v1" } ]
2014-02-13
[ [ "Yu", "Bei", "" ], [ "Dong", "Sheqin", "" ], [ "Goto", "Statoshi", "" ] ]
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1402.2899
Bei Yu
Duo Ding and Bei Yu and David Z. Pan
GLOW: A global router for low-power thermal-reliable interconnect synthesis using photonic wavelength multiplexing
null
null
10.1109/ASPDAC.2012.6165031
null
cs.AR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we examine the integration potential and explore the design space of low power thermal reliable on-chip interconnect synthesis featuring nanophotonics Wavelength Division Multiplexing (WDM). With the recent advancements, it is foreseen that nanophotonics holds the promise to be employed for future on-chip data signalling due to its unique power efficiency, signal delay and huge multiplexing potential. However, there are major challenges to address before feasible on-chip integration could be reached. In this paper, we present GLOW, a hybrid global router to provide low power opto-electronic interconnect synthesis under the considerations of thermal reliability and various physical design constraints such as optical power, delay and signal quality. GLOW is evaluated with testing cases derived from ISPD07-08 global routing benchmarks. Compared with a greedy approach, GLOW demonstrates around 23%-50% of total optical power reduction, revealing great potential of on-chip WDM interconnect synthesis.
[ { "created": "Wed, 12 Feb 2014 17:03:22 GMT", "version": "v1" } ]
2014-02-13
[ [ "Ding", "Duo", "" ], [ "Yu", "Bei", "" ], [ "Pan", "David Z.", "" ] ]
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1402.2902
Deliang Fan Deliang Fan
Deliang Fan, Mrigank Sharad, Abhronil Sengupta, Kaushik Roy
Hierarchical Temporal Memory Based on Spin-Neurons and Resistive Memory for Energy-Efficient Brain-Inspired Computing
this work was submitted to IEEE Transactions on Neural Networks and Learning Systems. It is under review now
null
10.1109/TNNLS.2015.2462731
null
cs.ET cond-mat.dis-nn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Hierarchical temporal memory (HTM) tries to mimic the computing in cerebral-neocortex. It identifies spatial and temporal patterns in the input for making inferences. This may require large number of computationally expensive tasks like, dot-product evaluations. Nano-devices that can provide direct mapping for such primitives are of great interest. In this work we show that the computing blocks for HTM can be mapped using low-voltage, fast-switching, magneto-metallic spin-neurons combined with emerging resistive cross-bar network (RCN). Results show possibility of more than 200x lower energy as compared to 45nm CMOS ASIC design
[ { "created": "Mon, 10 Feb 2014 19:50:32 GMT", "version": "v1" } ]
2016-11-17
[ [ "Fan", "Deliang", "" ], [ "Sharad", "Mrigank", "" ], [ "Sengupta", "Abhronil", "" ], [ "Roy", "Kaushik", "" ] ]
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1402.2903
Vadim E. Levit
Vadim E. Levit and Eugen Mandrescu
Computing Unique Maximum Matchings in O(m) time for Konig-Egervary Graphs and Unicyclic Graphs
10 pages, 5 figures
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null
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cs.DM math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let alpha(G) denote the maximum size of an independent set of vertices and mu(G) be the cardinality of a maximum matching in a graph G. A matching saturating all the vertices is perfect. If alpha(G) + mu(G) equals the number of vertices of G, then it is called a Konig-Egervary graph. A graph is unicyclic if it has a unique cycle. In 2010, Bartha conjectured that a unique perfect matching, if it exists, can be found in O(m) time, where m is the number of edges. In this paper we validate this conjecture for Konig-Egervary graphs and unicylic graphs. We propose a variation of Karp-Sipser leaf-removal algorithm (Karp and Spiser, 1981), which ends with an empty graph if and only if the original graph is a Konig-Egervary graph with a unique perfect matching obtained as an output as well. We also show that a unicyclic non-bipartite graph G may have at most one perfect matching, and this is the case where G is a Konig-Egervary graph.
[ { "created": "Wed, 12 Feb 2014 17:22:46 GMT", "version": "v1" } ]
2014-02-13
[ [ "Levit", "Vadim E.", "" ], [ "Mandrescu", "Eugen", "" ] ]
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1402.2904
Bei Yu
Duo Ding and Bei Yu and Joydeep Ghosh and David Z. Pan
EPIC: Efficient prediction of IC manufacturing hotspots with a unified meta-classification formulation
null
null
10.1109/ASPDAC.2012.6164956
null
cs.AR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we present EPIC, an efficient and effective predictor for IC manufacturing hotspots in deep sub-wavelength lithography. EPIC proposes a unified framework to combine different hotspot detection methods together, such as machine learning and pattern matching, using mathematical programming/optimization. EPIC algorithm has been tested on a number of industry benchmarks under advanced manufacturing conditions. It demonstrates so far the best capability in selectively combining the desirable features of various hotspot detection methods (3.5-8.2% accuracy improvement) as well as significant suppression of the detection noise (e.g., 80% false-alarm reduction). These characteristics make EPIC very suitable for conducting high performance physical verification and guiding efficient manufacturability friendly physical design.
[ { "created": "Wed, 12 Feb 2014 17:25:05 GMT", "version": "v1" } ]
2014-02-13
[ [ "Ding", "Duo", "" ], [ "Yu", "Bei", "" ], [ "Ghosh", "Joydeep", "" ], [ "Pan", "David Z.", "" ] ]
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1402.2906
Bei Yu
Yen-Hung Lin and Bei Yu and David Z. Pan and Yih-Lang Li
TRIAD: a triple patterning lithography aware detailed router
null
null
10.1145/2429384.2429408
null
cs.AR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
TPL-friendly detailed routers require a systematic approach to detect TPL conflicts. However, the complexity of conflict graph (CG) impedes directly detecting TPL conflicts in CG. This work proposes a token graph-embedded conflict graph (TECG) to facilitate the TPL conflict detection while maintaining high coloring-flexibility. We then develop a TPL aware detailed router (TRIAD) by applying TECG to a gridless router with the TPL stitch generation. Compared to a greedy coloring approach, experimental results indicate that TRIAD generates no conflicts and few stitches with shorter wirelength at the cost of 2.41x of runtime.
[ { "created": "Wed, 12 Feb 2014 17:34:01 GMT", "version": "v1" } ]
2014-02-14
[ [ "Lin", "Yen-Hung", "" ], [ "Yu", "Bei", "" ], [ "Pan", "David Z.", "" ], [ "Li", "Yih-Lang", "" ] ]
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1402.2908
Sylvain Schmitz
Sylvain Schmitz and Philippe Schnoebelen
The Power of Well-Structured Systems
Invited talk
Proceedings of Concur 2013, Lecture Notes in Computer Science vol. 8052, pp. 5--24
10.1007/978-3-642-40184-8_2
null
cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Well-structured systems, aka WSTSs, are computational models where the set of possible configurations is equipped with a well-quasi-ordering which is compatible with the transition relation between configurations. This structure supports generic decidability results that are important in verification and several other fields. This paper recalls the basic theory underlying well-structured systems and shows how two classic decision algorithms can be formulated as an exhaustive search for some "bad" sequences. This lets us describe new powerful techniques for the complexity analysis of WSTS algorithms. Recently, these techniques have been successful in precisely characterising the power, in a complexity-theoretical sense, of several important WSTS models like unreliable channel systems, monotonic counter machines, or networks of timed systems.
[ { "created": "Wed, 12 Feb 2014 17:35:34 GMT", "version": "v1" } ]
2014-02-13
[ [ "Schmitz", "Sylvain", "" ], [ "Schnoebelen", "Philippe", "" ] ]
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1402.2910
Leonid Slepyan I
Mark Ayzenberg-Stepanenko, Gennady Mishuris, Leonid Slepyan
Brittle fracture in a periodic structure with internal potential energy. Spontaneous crack propagation
16 Figures
null
10.1098/rspa.2014.0121
null
cond-mat.soft physics.class-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Spontaneous brittle fracture is studied based on the recently introduced model (Mishuris and Slepyan, Brittle fracture in a periodic structure with internal potential energy. Proc. Roy. Soc. A, in press). A periodic structure is considered, where only the prospective crack-path layer is specified as a discrete set of alternating initially stretched and compressed bonds. A bridged crack destroying initially stretched bonds may propagate under a certain level of the internal energy without external sources. The general analytical solution with the crack speed $-$ energy relation is presented in terms of the crack-related dynamic Green's function. For the anisotropic two-line chain and lattice considered earlier in quasi-statics, the dynamic problem is examined in detail. The crack speed is found to grow unboundedly as the energy approaches its upper limit. It is revealed that the spontaneous fracture can occur in the form of a pure bridged, partially bridged or fully open crack depending on the internal energy level. Generally, the steady-state mode of the crack propagation is found to be realised, whereas an irregular growth, clustering and the crack speed oscillations are detected in a vicinity of the lower bound of the energy.
[ { "created": "Wed, 12 Feb 2014 17:45:42 GMT", "version": "v1" } ]
2015-06-18
[ [ "Ayzenberg-Stepanenko", "Mark", "" ], [ "Mishuris", "Gennady", "" ], [ "Slepyan", "Leonid", "" ] ]
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1402.2911
Jose D'Incao
V. E. Colussi, Chris H. Greene, and J. P. D'Incao
Three-body Physics in Strongly Correlated Spinor Condensates
5+ pages, 1 figure, and supplementary material (4 pages)
Phys. Rev. Lett. 113, 045302 (2014)
10.1103/PhysRevLett.113.045302
null
quant-ph cond-mat.quant-gas physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Spinor condensates have proven to be a rich area for probing many-body phenomena richer than that of an ultracold gas consisting of atoms restricted to a single spin state. In the strongly correlated regime, the physics controlling the possible novel phases of the condensate remains largely unexplored, and few-body aspects can play a central role in the properties and dynamics of the system through manifestations of Efimov physics. The present study solves the three-body problem for bosonic spinors using the hyperspherical adiabatic representation and characterizes the multiple families of Efimov states in spinor systems as well as their signatures in the scattering observables relevant for spinor condensates. These solutions exhibit a rich array of possible phenomena originating in universal few-body physics, which can strongly affect the spin dynamics and three-body mean-field contributions for spinor condensates. The collisional aspects of atom-dimer spinor condensates are also analyzed and effects are predicted that derive from Efimov physics.
[ { "created": "Wed, 12 Feb 2014 17:45:54 GMT", "version": "v1" } ]
2014-12-30
[ [ "Colussi", "V. E.", "" ], [ "Greene", "Chris H.", "" ], [ "D'Incao", "J. P.", "" ] ]
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1402.2917
Wolfgang L\"offler
W. L\"offler, J. F. Nye, J. H. Hannay
An experiment on the shifts of reflected C-lines
9 pages, 2 figures
null
10.1088/2040-8978/16/8/085703
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
An experiment is described that tests theoretical predictions on how C-lines incident obliquely on a surface behave on reflection. C-lines in a polarised wave are the analogues of the optical vortices carried by a complex scalar wave, which is the usual model for describing light and other electromagnetic waves. The centre of a laser beam that carries a (degenerate) C-line is shifted on reflection by the well-known Goos-H\"anchen and Imbert-Fedorov effects, but the C-line itself splits into two, both of which are shifted longitudinally and laterally; their shifts are different from that of the beam centre. To maximise the effect to be measured, internal reflection in a glass prism close to the critical angle was used. In a simple situation like this two recently published independent theories of C-line reflection overlap and it is shown that their predictions are identical. The measured differences in the lateral shifts of the two reflected C-lines are compared with theoretical expectations over a range of incidence angles.
[ { "created": "Wed, 12 Feb 2014 18:17:04 GMT", "version": "v1" } ]
2015-06-18
[ [ "Löffler", "W.", "" ], [ "Nye", "J. F.", "" ], [ "Hannay", "J. H.", "" ] ]
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1402.2921
Andre Anders
Joakim Andersson, Pavel Ni and Andr\'e Anders
Smoothing of Discharge Inhomogeneities at High Currents in Gasless High Power Impulse Magnetron Sputtering
submitted for the 7th Triennial Special Issue of the IEEE Transactions on Plasma Science "Images in Plasma Science," scheduled for publication in August 2014; Manuscript length is limited to 2 pages
null
10.1109/TPS.2014.2334600
null
physics.plasm-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The discharges in high power impulse magnetron sputtering (HiPIMS) have been reported to consist of azimuthally inhomogeneous plasma with locally increased light emission. The luminous zones seemingly travel around the racetrack and are implicated in generation of the high ion kinetic energies observed in HiPIMS. We show that the inhomogeneities smooth out at high discharge current to yield azimuthally homogeneous plasma. This may have implications for the spatial and kinetic energy distribution of sputtered particles, and therefore also on the thin films deposited by high power impulse magnetron sputtering.
[ { "created": "Wed, 12 Feb 2014 18:29:37 GMT", "version": "v1" } ]
2015-06-18
[ [ "Andersson", "Joakim", "" ], [ "Ni", "Pavel", "" ], [ "Anders", "André", "" ] ]
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1402.2925
arXiv Admin
Slim Triki, Taher Mekki and Anas Kamoun
Modeling Switched Behavior with Hybrid Bond Graph: Application to a Tank system
arXiv admin note: submission has been withdrawn by arXiv administrators due to inappropriate text reuse from external sources
IJCSI International Journal of Computer Science Issues, Vol. 11, Issue 1, No 2,pp. 60-66, January 2014
null
null
cs.SY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Different approaches have been used in the development of system models. In addition, modeling and simulation approaches are essential for design, analysis, control, and diagnosis of complex systems. This work presents a Simulink model for systems with mixed continuous and discrete behaviors. The model simulated was developed using the bond graph methodology and we model hybrid systems using hybrid bond graphs (HBGs), that incorporates local switching functions that enable the reconfiguration of energy flow paths. This approach has been implemented as a software tool called the MOdeling and Transformation of HBGs for Simulation (MOTHS) tool suite which incorporates a model translator that create Simulink models. Simulation model of a three-tank system that includes a switching component was developed using the bond graph methodology, and MoTHS software were used to build a Simulink model of the dynamic behavior.
[ { "created": "Wed, 12 Feb 2014 18:38:16 GMT", "version": "v1" }, { "created": "Thu, 9 Jun 2016 15:36:38 GMT", "version": "v2" } ]
2016-06-10
[ [ "Triki", "Slim", "" ], [ "Mekki", "Taher", "" ], [ "Kamoun", "Anas", "" ] ]
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1402.2930
Martin Helmer
Martin Helmer
An Algorithm to Compute the Topological Euler Characteristic, Chern-Schwartz-MacPherson Class and Segre Class of Projective Varieties
null
null
10.1016/j.jsc.2015.03.007
null
math.AG cs.SC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let $V$ be a closed subscheme of a projective space $\mathbb{P}^n$. We give an algorithm to compute the Chern-Schwartz-MacPherson class, Euler characteristic and Segre class of $ V$. The algorithm can be implemented using either symbolic or numerical methods. The algorithm is based on a new method for calculating the projective degrees of a rational map defined by a homogeneous ideal. Using this result and known formulas for the Chern-Schwartz-MacPherson class of a projective hypersurface and the Segre class of a projective variety in terms of the projective degrees of certain rational maps we give algorithms to compute the Chern-Schwartz-MacPherson class and Segre class of a projective variety. Since the Euler characteristic of $V$ is the degree of the zero dimensional component of the Chern-Schwartz-MacPherson class of $V$ our algorithm also computes the Euler characteristic $\chi(V)$. Relationships between the algorithm developed here and other existing algorithms are discussed. The algorithm is tested on several examples and performs favourably compared to current algorithms for computing Chern-Schwartz-MacPherson classes, Segre classes and Euler characteristics.
[ { "created": "Wed, 12 Feb 2014 18:52:38 GMT", "version": "v1" }, { "created": "Wed, 18 Mar 2015 16:02:29 GMT", "version": "v2" } ]
2016-03-24
[ [ "Helmer", "Martin", "" ] ]
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1402.2934
Tommaso Toffoli
Lev B Levitin and Tommaso Toffoli
A quantum limit on the information retrievable from an image
3 pages
null
null
null
quant-ph physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider the physical limitations imposed on the information content of an image by the wave and quantum nature of light, when the image is obtained by illuminating a reflecting or transmitting planar object by natural---i.e., fully thermalized---light, or by observation of an object emitting incoherent (thermal) radiation. The discreteness of the degrees of freedom and the statistical properties of thermal radiation are taken into account. We derive the maximum amount of information that can be retrieved from the object. This amount is always finite and is proportional to the area of the object, the solid angle under which the entrance pupil of the receiver is seen from the object, and the time of observation. An explicit expression for the information in the case where the information recorded by the receiver obeys Planck's spectral distribution is obtained. The amount of information per photon of recorded radiation is a universal numerical constant, independent of the parameters of observation.
[ { "created": "Wed, 12 Feb 2014 19:09:29 GMT", "version": "v1" } ]
2014-02-13
[ [ "Levitin", "Lev B", "" ], [ "Toffoli", "Tommaso", "" ] ]
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1402.2936
Jens Steinwandt
Jens Steinwandt, Florian Roemer, Martin Haardt, Giovanni Del Galdo
R-dimensional ESPRIT-type algorithms for strictly second-order non-circular sources and their performance analysis
accepted at IEEE Transactions on Signal Processing, 15 pages, 6 figures
null
10.1109/TSP.2014.2342673
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
High-resolution parameter estimation algorithms designed to exploit the prior knowledge about incident signals from strictly second-order (SO) non-circular (NC) sources allow for a lower estimation error and can resolve twice as many sources. In this paper, we derive the R-D NC Standard ESPRIT and the R-D NC Unitary ESPRIT algorithms that provide a significantly better performance compared to their original versions for arbitrary source signals. They are applicable to shift-invariant R-D antenna arrays and do not require a centrosymmetric array structure. Moreover, we present a first-order asymptotic performance analysis of the proposed algorithms, which is based on the error in the signal subspace estimate arising from the noise perturbation. The derived expressions for the resulting parameter estimation error are explicit in the noise realizations and asymptotic in the effective signal-to-noise ratio (SNR), i.e., the results become exact for either high SNRs or a large sample size. We also provide mean squared error (MSE) expressions, where only the assumptions of a zero mean and finite SO moments of the noise are required, but no assumptions about its statistics are necessary. As a main result, we analytically prove that the asymptotic performance of both R-D NC ESPRIT-type algorithms is identical in the high effective SNR regime. Finally, a case study shows that no improvement from strictly non-circular sources can be achieved in the special case of a single source.
[ { "created": "Wed, 12 Feb 2014 19:15:24 GMT", "version": "v1" }, { "created": "Fri, 1 Aug 2014 17:45:37 GMT", "version": "v2" }, { "created": "Tue, 6 Jan 2015 19:57:03 GMT", "version": "v3" } ]
2015-01-07
[ [ "Steinwandt", "Jens", "" ], [ "Roemer", "Florian", "" ], [ "Haardt", "Martin", "" ], [ "Del Galdo", "Giovanni", "" ] ]
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1402.2940
Laurent Mugnier
Nicolas V\'edrenne, Laurent M. Mugnier, Vincent Michau, Marie-Th\'er\`ese Velluet and Rudolph Bierent
Laser beam complex amplitude measurement by phase diversity
Accepted for publication in Optics Express
null
10.1364/OE.22.004575
null
physics.optics physics.ins-det
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The control of the optical quality of a laser beam requires a complex amplitude measurement able to deal with strong modulus variations and potentially highly perturbed wavefronts. The method proposed here consists in an extension of phase diversity to complex amplitude measurements that is effective for highly perturbed beams. Named CAMELOT for Complex Amplitude MEasurement by a Likelihood Optimization Tool, it relies on the acquisition and processing of few images of the beam section taken along the optical path. The complex amplitude of the beam is retrieved from the images by the minimization of a Maximum a Posteriori error metric between the images and a model of the beam propagation. The analytical formalism of the method and its experimental validation are presented. The modulus of the beam is compared to a measurement of the beam profile, the phase of the beam is compared to a conventional phase diversity estimate. The precision of the experimental measurements is investigated by numerical simulations.
[ { "created": "Tue, 11 Feb 2014 18:03:01 GMT", "version": "v1" }, { "created": "Thu, 13 Feb 2014 10:47:01 GMT", "version": "v2" } ]
2015-06-18
[ [ "Védrenne", "Nicolas", "" ], [ "Mugnier", "Laurent M.", "" ], [ "Michau", "Vincent", "" ], [ "Velluet", "Marie-Thérèse", "" ], [ "Bierent", "Rudolph", "" ] ]
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1402.2941
Zohaib Khan
Zohaib Khan, Faisal Shafait, Yiqun Hu, Ajmal Mian
Multispectral Palmprint Encoding and Recognition
Preliminary version of this manuscript was published in ICCV 2011. Z. Khan A. Mian and Y. Hu, "Contour Code: Robust and Efficient Multispectral Palmprint Encoding for Human Recognition", International Conference on Computer Vision, 2011. MATLAB Code available: https://sites.google.com/site/zohaibnet/Home/codes
null
null
null
cs.CV
http://creativecommons.org/licenses/by-nc-sa/3.0/
Palmprints are emerging as a new entity in multi-modal biometrics for human identification and verification. Multispectral palmprint images captured in the visible and infrared spectrum not only contain the wrinkles and ridge structure of a palm, but also the underlying pattern of veins; making them a highly discriminating biometric identifier. In this paper, we propose a feature encoding scheme for robust and highly accurate representation and matching of multispectral palmprints. To facilitate compact storage of the feature, we design a binary hash table structure that allows for efficient matching in large databases. Comprehensive experiments for both identification and verification scenarios are performed on two public datasets -- one captured with a contact-based sensor (PolyU dataset), and the other with a contact-free sensor (CASIA dataset). Recognition results in various experimental setups show that the proposed method consistently outperforms existing state-of-the-art methods. Error rates achieved by our method (0.003% on PolyU and 0.2% on CASIA) are the lowest reported in literature on both dataset and clearly indicate the viability of palmprint as a reliable and promising biometric. All source codes are publicly available.
[ { "created": "Thu, 6 Feb 2014 06:35:51 GMT", "version": "v1" } ]
2014-02-13
[ [ "Khan", "Zohaib", "" ], [ "Shafait", "Faisal", "" ], [ "Hu", "Yiqun", "" ], [ "Mian", "Ajmal", "" ] ]
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1402.2945
Andre Anders
Jonathan Kolbeck and Andr\'e Anders
Unusual Cathode Erosion Patterns Observed for Steered Arc Sources
Manuscript submitted to the 7th Triennial Special Issue of the IEEE Transactions on Plasma Science "Images in Plasma Science," scheduled for publication in August 2014. Manuscript length is limited to 2 pages
null
10.1109/TPS.2014.2328333
null
physics.plasm-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A cathodic arc source with a magnetron-type magnetic field was investigated for stability, erosion, and compatibility with a linear macroparticle filter. Here we report about unusual arc spot erosion patterns, which were narrow (~ 2 mm) with periodic pits when operating in argon, and broad (~ 10 mm) with periodic groves and ridges when operating in an argon and oxygen mixtures. These observations can be correlated with the ignition probability for type 2 and type 1 arc spots, respectively.
[ { "created": "Wed, 12 Feb 2014 19:36:10 GMT", "version": "v1" } ]
2015-06-18
[ [ "Kolbeck", "Jonathan", "" ], [ "Anders", "André", "" ] ]
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1402.2948
Petr \v{C}erm\'ak
Petr \v{C}erm\'ak, Alessio Lomuscio, Fabio Mogavero, Aniello Murano
MCMAS-SLK: A Model Checker for the Verification of Strategy Logic Specifications
null
null
null
null
cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We introduce MCMAS-SLK, a BDD-based model checker for the verification of systems against specifications expressed in a novel, epistemic variant of strategy logic. We give syntax and semantics of the specification language and introduce a labelling algorithm for epistemic and strategy logic modalities. We provide details of the checker which can also be used for synthesising agents' strategies so that a specification is satisfied by the system. We evaluate the efficiency of the implementation by discussing the results obtained for the dining cryptographers protocol and a variant of the cake-cutting problem.
[ { "created": "Tue, 11 Feb 2014 18:21:25 GMT", "version": "v1" }, { "created": "Thu, 13 Feb 2014 11:05:29 GMT", "version": "v2" }, { "created": "Fri, 16 May 2014 09:47:01 GMT", "version": "v3" } ]
2014-05-19
[ [ "Čermák", "Petr", "" ], [ "Lomuscio", "Alessio", "" ], [ "Mogavero", "Fabio", "" ], [ "Murano", "Aniello", "" ] ]
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1402.2949
Aaron Karper
Aaron Karper
A Programming Language Oriented Approach to Computability
Bachelor thesis at the University of Bern, supervised by Professor Dr. Thomas Strahm
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cs.PL cs.LO
http://creativecommons.org/licenses/publicdomain/
The field of computability and complexity was, where computer science sprung from. Turing, Church, and Kleene all developed formalisms that demonstrated what they held "intuitively computable". The times change however and today's (aspiring) computer scientists are less proficient in building automata or composing functions and are much more native to the world of programming languages. This article will try to introduce typical concepts of computability theory and complexity in a form more fitted for a modern developer. It is mostly based on \cite{jones}, but takes input from other sources to provide examples, additional information, etc.
[ { "created": "Mon, 10 Feb 2014 21:35:37 GMT", "version": "v1" } ]
2014-02-13
[ [ "Karper", "Aaron", "" ] ]
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1402.2951
Andre Anders
Andr\'e Anders, Pavel Ni, and Joakim Andersson
Drifting Ionization Zone in Sputtering Magnetron Discharges at Very Low Currents
The manuscript was submitted to the 7th Triennial Special Issue of the IEEE Transactions on Plasma Science "Images in Plasma Science," scheduled for publication in August 2014. The manuscript length is limited to 2 pages
null
10.1109/TPS.2014.2334601
null
physics.plasm-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Discharges with crossed electric and magnetic fields are known to develop instabilities that are crucial in the transport of charged particles. Sputtering magnetrons are no exception. While most recent studies focused on traveling ionization zones in high power impulse magnetron sputtering, we show here fast camera images of magnetron discharges at very low current. A single drifting ionization zone is always present, even down to the threshold current of about 10 mA.
[ { "created": "Wed, 12 Feb 2014 19:49:47 GMT", "version": "v1" } ]
2015-06-18
[ [ "Anders", "André", "" ], [ "Ni", "Pavel", "" ], [ "Andersson", "Joakim", "" ] ]
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1402.2958
Stephen Eckel
Stephen Eckel, Jeffrey G. Lee, Fred Jendrzejewski, Noel Murray, Charles W. Clark, Christopher J. Lobb, William D. Phillips, Mark Edwards and Gretchen K. Campbell
Hysteresis in a quantized, superfluid atomtronic circuit
20 pages, 4 figures
Nature 506, 200-203 (2014)
10.1038/nature12958
null
cond-mat.quant-gas physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Atomtronics is an emerging interdisciplinary field that seeks new functionality by creating devices and circuits where ultra-cold atoms, often superfluids, play a role analogous to the electrons in electronics. Hysteresis is widely used in electronic circuits, e.g., it is routinely observed in superconducting circuits and is essential in rf-superconducting quantum interference devices [SQUIDs]. Furthermore, hysteresis is as fundamental to superfluidity (and superconductivity) as quantized persistent currents, critical velocity, and Josephson effects. Nevertheless, in spite of multiple theoretical predictions, hysteresis has not been previously observed in any superfluid, atomic-gas Bose-Einstein condensate (BEC). Here we demonstrate hysteresis in a quantized atomtronic circuit: a ring of superfluid BEC obstructed by a rotating weak link. We directly detect hysteresis between quantized circulation states, in contrast to superfluid liquid helium experiments that observed hysteresis directly in systems where the quantization of flow could not be observed and indirectly in systems that showed quantized flow. Our techniques allow us to tune the size of the hysteresis loop and to consider the fundamental excitations that accompany hysteresis. The results suggest that the relevant excitations involved in hysteresis are vortices and indicate that dissipation plays an important role in the dynamics. Controlled hysteresis in atomtronic circuits may prove to be a crucial feature for the development of practical devices, just as it has in electronic circuits like memory, digital noise filters (e.g., Schmitt triggers), and magnetometers (e.g., SQUIDs).
[ { "created": "Wed, 12 Feb 2014 20:21:10 GMT", "version": "v1" }, { "created": "Wed, 1 Oct 2014 17:30:52 GMT", "version": "v2" } ]
2014-10-02
[ [ "Eckel", "Stephen", "" ], [ "Lee", "Jeffrey G.", "" ], [ "Jendrzejewski", "Fred", "" ], [ "Murray", "Noel", "" ], [ "Clark", "Charles W.", "" ], [ "Lobb", "Christopher J.", "" ], [ "Phillips", "William D.", "" ], [ "Edwards", "Mark", "" ], [ "Campbell", "Gretchen K.", "" ] ]
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1402.2959
Sebastien Verel
Gabriela Ochoa, S\'ebastien Verel (LISIC), Fabio Daolio (ISI), Marco Tomassini (ISI)
Local Optima Networks: A New Model of Combinatorial Fitness Landscapes
null
Recent Advances in the Theory and Application of Fitness Landscapes, Hendrik Richter, Andries Engelbrecht (Ed.) (2014) 233-262
10.1007/978-3-642-41888-4_9
null
cs.NE cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This chapter overviews a recently introduced network-based model of combinatorial landscapes: Local Optima Networks (LON). The model compresses the information given by the whole search space into a smaller mathematical object that is a graph having as vertices the local optima and as edges the possible weighted transitions between them. Two definitions of edges have been proposed: basin-transition and escape-edges, which capture relevant topological features of the underlying search spaces. This network model brings a new set of metrics to characterize the structure of combinatorial landscapes, those associated with the science of complex networks. These metrics are described, and results are presented of local optima network extraction and analysis for two selected combinatorial landscapes: NK landscapes and the quadratic assignment problem. Network features are found to correlate with and even predict the performance of heuristic search algorithms operating on these problems.
[ { "created": "Wed, 12 Feb 2014 20:21:54 GMT", "version": "v1" } ]
2014-02-13
[ [ "Ochoa", "Gabriela", "", "LISIC" ], [ "Verel", "Sébastien", "", "LISIC" ], [ "Daolio", "Fabio", "", "ISI" ], [ "Tomassini", "Marco", "", "ISI" ] ]
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1402.2963
William Bradley
William F. Bradley
Running in Circles: Packet Routing on Ring Networks
Bradley, William F. (2002). Running in circles: packet routing on ring networks (Doctoral dissertation, Massachusetts Institute of Technology)
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math.PR cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
I analyze packet routing on unidirectional ring networks, with an eye towards establishing bounds on the expected length of the queues. Suppose we route packets by a greedy "hot potato" protocol. If packets are inserted by a Bernoulli process and have uniform destinations around the ring, and if the nominal load is kept fixed, then I can construct an upper bound on the expected queue length per node that is independent of the size of the ring. If the packets only travel one or two steps, I can calculate the exact expected queue length for rings of any size. I also show some stability results under more general circumstances. If the packets are inserted by any ergodic hidden Markov process with nominal loads less than one, and routed by any greedy protocol, I prove that the ring is ergodic.
[ { "created": "Wed, 12 Feb 2014 20:29:58 GMT", "version": "v1" } ]
2014-02-13
[ [ "Bradley", "William F.", "" ] ]
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1402.2964
Michael Hahn
Michael Hahn
Electron Impact Ionization of Stored Highly Charged Ions
Accepted for Journal of Physics Conference Series
null
10.1088/1742-6596/488/1/012050
null
physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Accurate cross section data for electron impact ionization (EII) are needed in order to interpret the spectra of collisionally ionized plasmas both in astrophysics and in the laboratory. Models and spectroscopic diagnostics of such plasmas rely on accurate ionization balance calculations, which depend, in turn, on the underlying rates for EII and electron-ion recombination. EII measurements have been carried out using the TSR storage ring located at the Max-Planck-Institut fuer Kernphysik in Heidelberg, Germany. Storage ring measurements are largely free of metastable contamination, resulting in unambiguous EII data, unlike what is encountered with other experimental geometries. As it is impractical to perform experiments for every ion, theory must provide the bulk of the necessary EII data. In order to guide theory, TSR experiments have focused on providing at least one measurement for every isoelectronic sequence. EII data have been measured for ions from 13 isoelectronic sequences: Li-like silicon and chlorine, Be-like sulfur, B-like magnesium, and F-like through K-like iron. These experimental results provide an important benchmark for EII theory.
[ { "created": "Wed, 12 Feb 2014 20:31:26 GMT", "version": "v1" } ]
2015-06-18
[ [ "Hahn", "Michael", "" ] ]
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1402.2965
Bin Jiang
Bin Jiang, Junjun Yin, and Qingling Liu
Zipf's Law for All the Natural Cities around the World
20 pages, 6 figures, 2 tables
International Journal of Geographical Information Science, 29(3), 498-522, 2015
10.1080/13658816.2014.988715
null
nlin.AO physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Two fundamental issues surrounding research on Zipf's law regarding city sizes are whether and why this law holds. This paper does not deal with the latter issue with respect to why, and instead investigates whether Zipf's law holds in a global setting, thus involving all cities around the world. Unlike previous studies, which have mainly relied on conventional census data such as populations, and census-bureau-imposed definitions of cities, we adopt naturally (in terms of data speaks for itself) delineated cities, or natural cities, to be more precise, in order to examine Zipf's law. We find that Zipf's law holds remarkably well for all natural cities at the global level, and remains almost valid at the continental level except for Africa at certain time instants. We further examine the law at the country level, and note that Zipf's law is violated from country to country or from time to time. This violation is mainly due to our limitations; we are limited to individual countries, or to a static view on city-size distributions. The central argument of this paper is that Zipf's law is universal, and we therefore must use the correct scope in order to observe it. We further find Zipf's law applied to city numbers; the number of cities in the first largest country is twice as many as that in the second largest country, three times as many as that in the third largest country, and so on. These findings have profound implications for big data and the science of cities. Keywords: Night-time imagery, city-size distributions, head/tail division rule, head/tail breaks, big data
[ { "created": "Wed, 12 Feb 2014 20:34:18 GMT", "version": "v1" }, { "created": "Wed, 21 May 2014 06:32:31 GMT", "version": "v2" }, { "created": "Sun, 28 Sep 2014 18:40:34 GMT", "version": "v3" }, { "created": "Mon, 3 Nov 2014 11:55:56 GMT", "version": "v4" } ]
2020-11-09
[ [ "Jiang", "Bin", "" ], [ "Yin", "Junjun", "" ], [ "Liu", "Qingling", "" ] ]
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1402.2967
Jan K\v{r}et\'insk\'y
Tom\'a\v{s} Br\'azdil and Krishnendu Chatterjee and Martin Chmel\'ik and Vojt\v{e}ch Forejt and Jan K\v{r}et\'insk\'y and Marta Kwiatkowska and David Parker and Mateusz Ujma
Verification of Markov Decision Processes using Learning Algorithms
null
null
null
null
cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a general framework for applying machine-learning algorithms to the verification of Markov decision processes (MDPs). The primary goal of these techniques is to improve performance by avoiding an exhaustive exploration of the state space. Our framework focuses on probabilistic reachability, which is a core property for verification, and is illustrated through two distinct instantiations. The first assumes that full knowledge of the MDP is available, and performs a heuristic-driven partial exploration of the model, yielding precise lower and upper bounds on the required probability. The second tackles the case where we may only sample the MDP, and yields probabilistic guarantees, again in terms of both the lower and upper bounds, which provides efficient stopping criteria for the approximation. The latter is the first extension of statistical model-checking for unbounded properties in MDPs. In contrast with other related approaches, we do not restrict our attention to time-bounded (finite-horizon) or discounted properties, nor assume any particular properties of the MDP. We also show how our techniques extend to LTL objectives. We present experimental results showing the performance of our framework on several examples.
[ { "created": "Mon, 10 Feb 2014 15:33:35 GMT", "version": "v1" }, { "created": "Sun, 23 Mar 2014 19:48:47 GMT", "version": "v2" }, { "created": "Mon, 30 Mar 2015 13:59:12 GMT", "version": "v3" } ]
2015-03-31
[ [ "Brázdil", "Tomáš", "" ], [ "Chatterjee", "Krishnendu", "" ], [ "Chmelík", "Martin", "" ], [ "Forejt", "Vojtěch", "" ], [ "Křetínský", "Jan", "" ], [ "Kwiatkowska", "Marta", "" ], [ "Parker", "David", "" ], [ "Ujma", "Mateusz", "" ] ]
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1402.2970
Piotr Skowron
Piotr Skowron and Krzysztof Rzadca and Anwitaman Datta
Cooperation and Competition when Bidding for Complex Projects: Centralized and Decentralized Perspectives
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cs.GT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
To successfully complete a complex project, be it a construction of an airport or of a backbone IT system, agents (companies or individuals) must form a team having required competences and resources. A team can be formed either by the project issuer based on individual agents' offers (centralized formation); or by the agents themselves (decentralized formation) bidding for a project as a consortium---in that case many feasible teams compete for the contract. We investigate rational strategies of the agents (what salary should they ask? with whom should they team up?). We propose concepts to characterize the stability of the winning teams and study their computational complexity.
[ { "created": "Wed, 12 Feb 2014 20:52:12 GMT", "version": "v1" }, { "created": "Thu, 8 May 2014 17:16:56 GMT", "version": "v2" }, { "created": "Thu, 15 Sep 2016 16:44:59 GMT", "version": "v3" } ]
2016-09-16
[ [ "Skowron", "Piotr", "" ], [ "Rzadca", "Krzysztof", "" ], [ "Datta", "Anwitaman", "" ] ]
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1402.2991
Jean-Michel Muller
Stef Graillat (LIP6), Vincent Lef\`evre (Inria Grenoble Rh\^one-Alpes / LIP Laboratoire de l'Informatique du Parall\'elisme), Jean-Michel Muller (Inria Grenoble Rh\^one-Alpes / LIP Laboratoire de l'Informatique du Parall\'elisme)
On the maximum relative error when computing x^n in floating-point arithmetic
null
null
null
null
cs.NA math.NA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we improve the usual relative error bound for the computation of x^n through iterated multiplications by x in binary floating-point arithmetic. The obtained error bound is only slightly better than the usual one, but it is simpler. We also discuss the more general problem of computing the product of n terms.
[ { "created": "Tue, 11 Feb 2014 20:13:14 GMT", "version": "v1" } ]
2014-02-14
[ [ "Graillat", "Stef", "", "LIP6" ], [ "Lefèvre", "Vincent", "", "Inria Grenoble Rhône-Alpes\n / LIP Laboratoire de l'Informatique du Parallélisme" ], [ "Muller", "Jean-Michel", "", "Inria Grenoble Rhône-Alpes / LIP Laboratoire de l'Informatique du\n Parallélisme" ] ]
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1402.2996
Valery Vilisov
Valery Vilisov
Robot Training Under Conditions of Incomplete Information
null
null
null
null
cs.RO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The development of the works of the author about adaptive algorithms of teaching the robotic systems with the help of operator is described here. An operator is assumed to be an experience decision-maker and sane carrier of a target which the robotic system needs to achieve. The works characteristic is that the behavior of the robotic system is not specified a priori (as standard) but is formed adaptively based on the information about the situation and decisions made by a decision-maker. In this scheme the robotic system and the decision-maker can cooperate in the normal operation mode of the robotic system or in the time sharing mode with the possibility to plan actively the experiment on the robotic system. If the adaptive scheme is chosen, there are teaching stages and operating stages of the robotic system. At that the decision-maker can act slowly having the possibility to weigh the decision made. This way allows the robotic system reacting flexibly by switching between preset models and respond to the environment instability. The data integrity about the environment condition and about target preferences of an operator plays a very important role in robotic system work. The effective work of the robotic system depends on the effective settings of a preference model of the robotic system based on the decisions of the decision-maker and on the effective control. The influence of settings and control factors on the index of effectiveness of the robotic system is subject of this work. The uncertainty may be caused by the data flow limitation received by the operator on the stage of the model setting.
[ { "created": "Wed, 12 Feb 2014 22:10:52 GMT", "version": "v1" } ]
2015-09-08
[ [ "Vilisov", "Valery", "" ] ]
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1402.2998
Jingchen Feng
Jingchen Feng, Herbert Levine, Xiaoming Mao, and Leonard M. Sander
Alignment and Nonlinear Elasticity in Biopolymer Gels
5 pages, 4 Figures
null
10.1103/PhysRevE.91.042710
null
cond-mat.soft physics.bio-ph q-bio.QM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a Landau type theory for the non-linear elasticity of biopolymer gels with a part of the order parameter describing induced nematic order of fibers in the gel. We attribute the non-linear elastic behavior of these materials to fiber alignment induced by strain. We suggest an application to contact guidance of cell motility in tissue. We compare our theory to simulation of a disordered lattice model for biopolymers. We treat homogeneous deformations such as simple shear, hydrostatic expansion, and simple extension, and obtain good agreement between theory and simulation. We also consider a localized perturbation which is a simple model for a contracting cell in a medium.
[ { "created": "Wed, 12 Feb 2014 22:36:03 GMT", "version": "v1" }, { "created": "Tue, 14 Oct 2014 18:35:02 GMT", "version": "v2" } ]
2015-06-18
[ [ "Feng", "Jingchen", "" ], [ "Levine", "Herbert", "" ], [ "Mao", "Xiaoming", "" ], [ "Sander", "Leonard M.", "" ] ]
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1402.3005
Ramy Mawad
Ramy Mawad
Earth\'s Mass Variability
35 pages, 11 figures
null
null
null
physics.gen-ph astro-ph.EP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The perturbation of the Earth caused by variability of mass of Earth as additional reason with gravity of celestial bodies and shape of the Earth. The Earth eating and collecting matters from space and loss or eject matters to space through its flying in the space around the Sun. The source of the rising in the global sea level is not closed in global warming and icebergs, but the outer space is the additional important source for this rising. The Earth eats waters from space in unknown mechanism. The mass of the Earth become greater in November i.e. before transit apoapsis two months, and become latter in February i.e. after transit apoapsis to two months.
[ { "created": "Wed, 12 Feb 2014 23:31:10 GMT", "version": "v1" } ]
2022-03-29
[ [ "Mawad", "Ramy", "" ] ]
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1402.3008
John Sous
J. Sous, P. Goel and M. Nooijen
Similarity transformed equation of motion coupled cluster theory revisited: a benchmark study of valence excited states
Invited article to the Special Issue of Molecular Physics "proceedings of Molecular Quantum Mechanics 2013: electron correlation: the many-body problem at the heart of chemistry" dedicated as a Festschrift for Professor Rodney Bartlett; 49 pages, 10 figures, 11 tables
Mol. Phys. 112, 616 (2014)
10.1080/00268976.2013.847216
null
physics.chem-ph physics.atom-ph physics.comp-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The similarity transformed equation of motion coupled cluster (STEOM-CC) method is benchmarked against CC3 and EOM-CCSDT-3 for a large test set of valence excited states of organic molecules studied by Schreiber et al. [M. Schreiber, M.R. Silva-Junior, S.P. Sauer, and W. Thiel, J. Chem. Phys. $\textbf{128}$, 134110 (2008)]. STEOM-CC is found to behave quite satisfactorily and provides significant improvement over EOM-CCSD, CASPT2 and NEVPT2 for singlet excited states, lowering standard deviations of these methods by almost a factor of 2. Triplet excited states are found to be described less accurately, however. Besides the parent version of STEOM-CC, additional variations are considered. STEOM-D includes a perturbative correction from doubly excited determinants. The novel STEOM-H ($\omega$) approach presents a sophisticated technique to render the STEOM-CC transformed Hamiltonian hermitian. In STEOM-PT, the expensive CCSD step is replaced by many-body second-order perturbation theory (MBPT(2)), while extended STEOM (EXT-STEOM) provides access to doubly excited states. To study orbital invariance in STEOM, we investigate orbital rotation in the STEOM-ORB approach. Comparison of theses variations of STEOM for the large test set provides a comprehensive statistical basis to gauge the usefulness of these approaches.
[ { "created": "Wed, 12 Feb 2014 23:53:24 GMT", "version": "v1" }, { "created": "Thu, 4 Jan 2018 17:55:09 GMT", "version": "v2" } ]
2018-01-09
[ [ "Sous", "J.", "" ], [ "Goel", "P.", "" ], [ "Nooijen", "M.", "" ] ]
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1402.3010
Eray Ozkural
Eray \"Ozkural, Cevdet Aykanat
1-D and 2-D Parallel Algorithms for All-Pairs Similarity Problem
null
null
null
null
cs.IR cs.DC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
All-pairs similarity problem asks to find all vector pairs in a set of vectors the similarities of which surpass a given similarity threshold, and it is a computational kernel in data mining and information retrieval for several tasks. We investigate the parallelization of a recent fast sequential algorithm. We propose effective 1-D and 2-D data distribution strategies that preserve the essential optimizations in the fast algorithm. 1-D parallel algorithms distribute either dimensions or vectors, whereas the 2-D parallel algorithm distributes data both ways. Additional contributions to the 1-D vertical distribution include a local pruning strategy to reduce the number of candidates, a recursive pruning algorithm, and block processing to reduce imbalance. The parallel algorithms were programmed in OCaml which affords much convenience. Our experiments indicate that the performance depends on the dataset, therefore a variety of parallelizations is useful.
[ { "created": "Thu, 13 Feb 2014 00:14:33 GMT", "version": "v1" } ]
2014-02-14
[ [ "Özkural", "Eray", "" ], [ "Aykanat", "Cevdet", "" ] ]
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1402.3011
Mikolas Janota
Joao Marques-Silva and Mikolas Janota
Computing Minimal Sets on Propositional Formulae I: Problems & Reductions
This version contains some fixes in formatting and bibliography
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cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Boolean Satisfiability (SAT) is arguably the archetypical NP-complete decision problem. Progress in SAT solving algorithms has motivated an ever increasing number of practical applications in recent years. However, many practical uses of SAT involve solving function as opposed to decision problems. Concrete examples include computing minimal unsatisfiable subsets, minimal correction subsets, prime implicates and implicants, minimal models, backbone literals, and autarkies, among several others. In most cases, solving a function problem requires a number of adaptive or non-adaptive calls to a SAT solver. Given the computational complexity of SAT, it is therefore important to develop algorithms that either require the smallest possible number of calls to the SAT solver, or that involve simpler instances. This paper addresses a number of representative function problems defined on Boolean formulas, and shows that all these function problems can be reduced to a generic problem of computing a minimal set subject to a monotone predicate. This problem is referred to as the Minimal Set over Monotone Predicate (MSMP) problem. This exercise provides new ways for solving well-known function problems, including prime implicates, minimal correction subsets, backbone literals, independent variables and autarkies, among several others. Moreover, this exercise motivates the development of more efficient algorithms for the MSMP problem. Finally the paper outlines a number of areas of future research related with extensions of the MSMP problem.
[ { "created": "Thu, 13 Feb 2014 00:27:51 GMT", "version": "v1" }, { "created": "Fri, 14 Feb 2014 14:48:55 GMT", "version": "v2" } ]
2014-02-17
[ [ "Marques-Silva", "Joao", "" ], [ "Janota", "Mikolas", "" ] ]
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1402.3015
N. Raj Rao
Curtis Jin and Raj Rao Nadakuditi and Eric Michielssen and Stephen Rand
Backscatter analysis based algorithms for increasing transmission through highly-scattering random media using phase-only modulated wavefronts
Revised version contains results of additional simulations
null
10.1364/JOSAA.31.001788
null
physics.optics cond-mat.dis-nn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Recent theoretical and experimental advances have shed light on the existence of so-called `perfectly transmitting' wavefronts with transmission coefficients close to 1 in strongly backscattering random media. These perfectly transmitting eigen-wavefronts can be synthesized by spatial amplitude and phase modulation. Here, we consider the problem of transmission enhancement using phase-only modulated wavefronts. We develop physically realizable iterative and non-iterative algorithms for increasing the transmission through such random media using backscatter analysis. We theoretically show that, despite the phase-only modulation constraint, the non-iterative algorithms will achieve at least about 25$\pi$% or about 78.5% transmission assuming there is at least one perfectly transmitting eigen-wavefront and that the singular vectors of the transmission matrix obey a maximum entropy principle so that they are isotropically random. We numerically analyze the limits of phase-only modulated transmission in 2-D with fully spectrally accurate simulators and provide rigorous numerical evidence confirming our theoretical prediction in random media with periodic boundary conditions that is composed of hundreds of thousands of non-absorbing scatterers. We show via numerical simulations that the iterative algorithms we have developed converge rapidly, yielding highly transmitting wavefronts using relatively few measurements of the backscatter field. Specifically, the best performing iterative algorithm yields approx 70% transmission using just 15-20 measurements in the regime where the non-iterative algorithms yield approximately 78.5% transmission but require measuring the entire modal reflection matrix.
[ { "created": "Thu, 13 Feb 2014 00:48:03 GMT", "version": "v1" }, { "created": "Fri, 20 Jun 2014 13:37:39 GMT", "version": "v2" } ]
2015-06-18
[ [ "Jin", "Curtis", "" ], [ "Nadakuditi", "Raj Rao", "" ], [ "Michielssen", "Eric", "" ], [ "Rand", "Stephen", "" ] ]
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1402.3017
Yiqi Zhang
Yiqi Zhang, Milivoj R. Beli\'c, Huaibin Zheng, Haixia Chen, Changbiao Li, Jianping Song, and Yanpeng Zhang
The Nonlinear Talbot Effect of Rogue Waves
4 pages, 4 figures
Phys. Rev. E, 89, 032902 (2014)
10.1103/PhysRevE.89.032902
null
nlin.PS physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Akhmediev and Kuznetsov-Ma breathers are rogue wave solutions of the nonlinear Schr\"odinger equation (NLSE). Talbot effect (TE) is an image recurrence phenomenon in the diffraction of light waves. We report the nonlinear TE of rogue waves in a cubic medium. It is different from the linear TE, in that the wave propagates in a NL medium and is an eigenmode of NLSE. Periodic rogue waves impinging on a NL medium exhibit recurrent behavior, but only at the TE length and at the half-TE length with a \pi-phase shift; the fractional TE is absent. The NL TE is the result of the NL interference of the lobes of rogue wave breathers. This interaction is related to the transverse period and intensity of breathers, in that the bigger the period and the higher the intensity, the shorter the TE length.
[ { "created": "Thu, 13 Feb 2014 01:43:22 GMT", "version": "v1" } ]
2014-03-11
[ [ "Zhang", "Yiqi", "" ], [ "Belić", "Milivoj R.", "" ], [ "Zheng", "Huaibin", "" ], [ "Chen", "Haixia", "" ], [ "Li", "Changbiao", "" ], [ "Song", "Jianping", "" ], [ "Zhang", "Yanpeng", "" ] ]
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1402.3021
Mukund Raghothaman
Rajeev Alur, Adam Freilich, Mukund Raghothaman
Regular Combinators for String Transformations
This is the full version, with omitted proofs and constructions, of the conference paper currently in submission
null
null
null
cs.FL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We focus on (partial) functions that map input strings to a monoid such as the set of integers with addition and the set of output strings with concatenation. The notion of regularity for such functions has been defined using two-way finite-state transducers, (one-way) cost register automata, and MSO-definable graph transformations. In this paper, we give an algebraic and machine-independent characterization of this class analogous to the definition of regular languages by regular expressions. When the monoid is commutative, we prove that every regular function can be constructed from constant functions using the combinators of choice, split sum, and iterated sum, that are analogs of union, concatenation, and Kleene-*, respectively, but enforce unique (or unambiguous) parsing. Our main result is for the general case of non-commutative monoids, which is of particular interest for capturing regular string-to-string transformations for document processing. We prove that the following additional combinators suffice for constructing all regular functions: (1) the left-additive versions of split sum and iterated sum, which allow transformations such as string reversal; (2) sum of functions, which allows transformations such as copying of strings; and (3) function composition, or alternatively, a new concept of chained sum, which allows output values from adjacent blocks to mix.
[ { "created": "Thu, 13 Feb 2014 02:17:03 GMT", "version": "v1" } ]
2014-02-14
[ [ "Alur", "Rajeev", "" ], [ "Freilich", "Adam", "" ], [ "Raghothaman", "Mukund", "" ] ]
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1402.3022
Arkady Zgonnikov
Arkady Zgonnikov, Ihor Lubashevsky, Shigeru Kanemoto, Toru Miyazawa, Takashi Suzuki
To react or not to react? Intrinsic stochasticity of human control in virtual stick balancing
18 pages, 9 figures, 2 tables
null
null
null
physics.bio-ph cs.SY nlin.AO q-bio.NC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Understanding how humans control unstable systems is central to many research problems, with applications ranging from quiet standing to aircraft landing. Increasingly much evidence appears in favor of event-driven control hypothesis: human operators only start actively controlling the system when the discrepancy between the current and desired system states becomes large enough. The event-driven models based on the concept of threshold can explain many features of the experimentally observed dynamics. However, much still remains unclear about the dynamics of human-controlled systems, which likely indicates that humans employ more intricate control mechanisms. The present paper argues that control activation in humans may be not threshold-driven, but instead intrinsically stochastic, noise-driven. Specifically, we suggest that control activation stems from stochastic interplay between the operator's need to keep the controlled system near the goal state on one hand and the tendency to postpone interrupting the system dynamics on the other hand. We propose a model capturing this interplay and show that it matches the experimental data on human balancing of virtual overdamped stick. Our results illuminate that the noise-driven activation mechanism plays a crucial role at least in the considered task, and, hypothetically, in a broad range of human-controlled processes.
[ { "created": "Thu, 13 Feb 2014 02:42:49 GMT", "version": "v1" }, { "created": "Mon, 9 Jun 2014 14:11:59 GMT", "version": "v2" }, { "created": "Mon, 16 Jun 2014 01:49:52 GMT", "version": "v3" } ]
2014-06-17
[ [ "Zgonnikov", "Arkady", "" ], [ "Lubashevsky", "Ihor", "" ], [ "Kanemoto", "Shigeru", "" ], [ "Miyazawa", "Toru", "" ], [ "Suzuki", "Takashi", "" ] ]
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1402.3023
Martin Mosquera
Martin A. Mosquera, Adam Wasserman
Integer Discontinuity of Density Functional Theory
5 pages, 2 figures
null
10.1103/PhysRevA.89.052506
null
physics.chem-ph
http://creativecommons.org/licenses/by-nc-sa/3.0/
Density functional approximations to the exchange-correlation energy of Kohn-Sham theory, such as the local density approximation and generalized gradient approximations, lack the well-known integer discontinuity, a feature that is critical to describe molecular dissociation correctly. Moreover, standard approximations to the exchange-correlation energy also fail to yield the correct linear dependence of the ground-state energy on the number of electrons when this is a non-integer number obtained from the grand canonical ensemble statistics. We present a formal framework to restore the integer discontinuity of any density functional approximation. Our formalism derives from a formula for the exact energy functional and a new constrained search functional that recovers the linear dependence of the energy on the number of electrons.
[ { "created": "Thu, 13 Feb 2014 03:05:17 GMT", "version": "v1" } ]
2015-06-18
[ [ "Mosquera", "Martin A.", "" ], [ "Wasserman", "Adam", "" ] ]
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1402.3032
Ziming Zhang
Ziming Zhang
Regularization for Multiple Kernel Learning via Sum-Product Networks
null
null
null
null
stat.ML cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we are interested in constructing general graph-based regularizers for multiple kernel learning (MKL) given a structure which is used to describe the way of combining basis kernels. Such structures are represented by sum-product networks (SPNs) in our method. Accordingly we propose a new convex regularization method for MLK based on a path-dependent kernel weighting function which encodes the entire SPN structure in our method. Under certain conditions and from the view of probability, this function can be considered to follow multinomial distributions over the weights associated with product nodes in SPNs. We also analyze the convexity of our regularizer and the complexity of our induced classifiers, and further propose an efficient wrapper algorithm to optimize our formulation. In our experiments, we apply our method to ......
[ { "created": "Thu, 13 Feb 2014 05:06:53 GMT", "version": "v1" } ]
2014-02-14
[ [ "Zhang", "Ziming", "" ] ]
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1402.3034
Sukhpal Singh
Sukhpal Singh and Inderveer Chana
Formal Specification Language Based IaaS Cloud Workload Regression Analysis
6 Pages including 2 figures, Published by IEEE Joint Chapter of IE/PEL/CS under IEEE UP section
Presented in the IEEE International Conference on Control, Computing, Communication and Materials (ICCCCM-2013) held at UIT, Allahabad, India on August 03-04, 2013
10.1109/ICCCCM.2013.6648901
978-1?4799?1375?6/13/$31.00 {copyright}2013 IEEE
cs.DC
http://creativecommons.org/licenses/publicdomain/
Cloud Computing is an emerging area for accessing computing resources. In general, Cloud service providers offer services that can be clustered into three categories: SaaS, PaaS and IaaS. This paper discusses the Cloud workload analysis. The efficient Cloud workload resource mapping technique is proposed. This paper aims to provide a means of understanding and investigating IaaS Cloud workloads and the resources. In this paper, regression analysis is used to analyze the Cloud workloads and identifies the relationship between Cloud workloads and available resources. The effective organization of dynamic nature resources can be done with the help of Cloud workloads. Till Cloud workload is considered a vital talent, the Cloud resources cannot be consumed in an effective style. The proposed technique has been validated by Z Formal specification language. This approach is effective in minimizing the cost and submission burst time of Cloud workloads.
[ { "created": "Thu, 13 Feb 2014 05:24:37 GMT", "version": "v1" } ]
2014-02-14
[ [ "Singh", "Sukhpal", "" ], [ "Chana", "Inderveer", "" ] ]
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1402.3035
Dolya Sergey N.
S. N. Dolya
Electromagnetic acceleration of electrically charged bodies
12 pages, 1 figure
null
null
null
physics.acc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Acceleration of electrically charged bodies is carried out by the electric field running via the spiral structure of the electric pulse. The accelerated particles have a cylindrical shape with a diameter of cylinder two millimeters, a length of the conical part thirteen millimeters and the total length three hundred millimeters. Pre-acceleration of the cylinder up to speed one kilometer per second is performed by gas-dynamic. The pulse with the voltage amplitude two megavolts and the power three hundreds megawatts goes into the spiral waveguide synchronously with the rod injected onto it. The rod is accelerated by the traveling pulse in the longitudinal direction up to the finite velocity six kilometers per second for length three hundreds meters.
[ { "created": "Thu, 13 Feb 2014 05:52:02 GMT", "version": "v1" } ]
2014-02-14
[ [ "Dolya", "S. N.", "" ] ]
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1402.3036
David Morgenthaler
J. David Morgenthaler and T. C. Hu
Optimal Alphabetic Ternary Trees
null
null
null
null
cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We give a new algorithm to construct optimal alphabetic ternary trees, where every internal node has at most three children. This algorithm generalizes the classic Hu-Tucker algorithm, though the overall computational complexity has yet to be determined.
[ { "created": "Thu, 13 Feb 2014 06:00:59 GMT", "version": "v1" } ]
2014-02-14
[ [ "Morgenthaler", "J. David", "" ], [ "Hu", "T. C.", "" ] ]
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1402.3040
Jia-Fei Hong
Jia-Fei Hong, Kathleen Ahrens, Chu-Ren Huang
Event Structure of Transitive Verb: A MARVS perspective
Chinese Lexical Semantics Workshop 2011(CLSW 2011) published in International Journal of Computer Processing of Languages (Vol. 24, No. 01, March 2012)
International Journal of Computer Processing of Languages (Vol. 24, No. 01, March 2012)
10.1142/S179384061240003X
null
cs.CL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Module-Attribute Representation of Verbal Semantics (MARVS) is a theory of the representation of verbal semantics that is based on Mandarin Chinese data (Huang et al. 2000). In the MARVS theory, there are two different types of modules: Event Structure Modules and Role Modules. There are also two sets of attributes: Event-Internal Attributes and Role-Internal Attributes, which are linked to the Event Structure Module and the Role Module, respectively. In this study, we focus on four transitive verbs as chi1(eat), wan2(play), huan4(change) and shao1(burn) and explore their event structures by the MARVS theory.
[ { "created": "Thu, 13 Feb 2014 06:44:24 GMT", "version": "v1" } ]
2014-02-14
[ [ "Hong", "Jia-Fei", "" ], [ "Ahrens", "Kathleen", "" ], [ "Huang", "Chu-Ren", "" ] ]
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1402.3043
Vladislav A. Yastrebov
David S. Kammer, Vladislav A. Yastrebov, Guillaume Anciaux, Jean-Francois Molinari
The existence of a critical length scale in regularised friction
21 pages, 7 figures
Journal of the Mechanics and Physics of Solids, 63:40-50 (2014)
10.1016/j.jmps.2013.10.007
null
physics.geo-ph physics.comp-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study a regularisation of Coulomb's friction law on the propagation of local slip at an interface between a deformable and a rigid solid. This regularisation, which was proposed based on experimental observations, smooths the effect of a sudden jump in the contact pressure over a characteristic length scale. We apply it in numerical simulations in order to analyse its influence on the behaviour of local slip. We first show that mesh convergence in dynamic simulations is achieved without any numerical damping in the bulk and draw a convergence map with respect to the characteristic length of the friction regularisation. By varying this length scale on the example of a given slip event, we observe that there is a critical length below which the friction regularisation does not affect anymore the propagation of the interface rupture. A spectral analysis of the regularisation on a periodic variation of Coulomb's friction is conducted to confirm the existence of this critical length. The results indicate that if the characteristic length of the friction regularisation is smaller than the critical length, a slip event behaves as if it was governed by Coulomb's law. We therefore propose that there is a domain of influence of the friction regularisation depending on its characteristic length and on the frequency content of the local slip event. A byproduct of the analysis is related to the existence of a physical length scale characterising a given frictional interface. We establish that the experimental determination of this interface property may be achieved by experimentally monitoring slip pulses whose frequency content is rich enough.
[ { "created": "Thu, 13 Feb 2014 07:08:39 GMT", "version": "v1" } ]
2014-02-14
[ [ "Kammer", "David S.", "" ], [ "Yastrebov", "Vladislav A.", "" ], [ "Anciaux", "Guillaume", "" ], [ "Molinari", "Jean-Francois", "" ] ]
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1402.3044
Piotr Skowron
Piotr Skowron and Piotr Faliszewski and Jerome Lang
Finding a Collective Set of Items: From Proportional Multirepresentation to Group Recommendation
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cs.GT cs.AI cs.MA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider the following problem: There is a set of items (e.g., movies) and a group of agents (e.g., passengers on a plane); each agent has some intrinsic utility for each of the items. Our goal is to pick a set of $K$ items that maximize the total derived utility of all the agents (i.e., in our example we are to pick $K$ movies that we put on the plane's entertainment system). However, the actual utility that an agent derives from a given item is only a fraction of its intrinsic one, and this fraction depends on how the agent ranks the item among the chosen, available, ones. We provide a formal specification of the model and provide concrete examples and settings where it is applicable. We show that the problem is hard in general, but we show a number of tractability results for its natural special cases.
[ { "created": "Thu, 13 Feb 2014 07:14:28 GMT", "version": "v1" }, { "created": "Fri, 8 Jan 2016 19:51:00 GMT", "version": "v2" } ]
2016-01-11
[ [ "Skowron", "Piotr", "" ], [ "Faliszewski", "Piotr", "" ], [ "Lang", "Jerome", "" ] ]
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1402.3052
Malte Kaluza C
A. S\"avert, S. P. D. Mangles, M. Schnell, E. Siminos, J. M. Cole, M. Leier, M. Reuter, M. B. Schwab, M. M\"oller, K. Poder, O. J\"ackel, G. G. Paulus, C. Spielmann, S. Skupin, Z. Najmudin, and M. C. Kaluza
Direct observation of the injection dynamics of a laser wakefield accelerator using few-femtosecond shadowgraphy
5 pages, 4 figures
Physical Review Letters 115, 055002 (2015)
10.1103/PhysRevLett.115.055002
null
physics.plasm-ph physics.acc-ph physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present few-femtosecond shadowgraphic snapshots taken during the non-linear evolution of the plasma wave in a laser wakefield accelerator with transverse synchronized few-cycle probe pulses. These snapshots can be directly associated with the electron density distribution within the plasma wave and give quantitative information about its size and shape. Our results show that self-injection of electrons into the first plasma wave period is induced by a lengthening of the first plasma period. Three dimensional particle in cell simulations support our observations.
[ { "created": "Thu, 13 Feb 2014 07:40:58 GMT", "version": "v1" }, { "created": "Fri, 31 Jul 2015 08:51:52 GMT", "version": "v2" } ]
2015-08-03
[ [ "Sävert", "A.", "" ], [ "Mangles", "S. P. D.", "" ], [ "Schnell", "M.", "" ], [ "Siminos", "E.", "" ], [ "Cole", "J. M.", "" ], [ "Leier", "M.", "" ], [ "Reuter", "M.", "" ], [ "Schwab", "M. B.", "" ], [ "Möller", "M.", "" ], [ "Poder", "K.", "" ], [ "Jäckel", "O.", "" ], [ "Paulus", "G. G.", "" ], [ "Spielmann", "C.", "" ], [ "Skupin", "S.", "" ], [ "Najmudin", "Z.", "" ], [ "Kaluza", "M. C.", "" ] ]
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1402.3054
A. I. Milstein
R.N. Lee and A.I. Milstein
Coulomb corrections to electron scattering on the extended source and the proton charge radius
4 pages, 1 figure
null
null
null
hep-ph nucl-th physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
It is shown that the account for the proton charge form factor in the Coulomb corrections to the electron-proton scattering cross section noticeably diminishes the difference between the value of the proton charge radius $r_{\mathrm{E}}$, extracted from the $ep$ scattering data, and that following from the muonic hydrogen data. For the electron energy much higher than the electron mass but much smaller than $r_{\mathrm{E}}^{-1}\approx 230$~MeV, the relative correction has the universal form $\delta r_{\mathrm{E}}/r_{\mathrm{E}}=-\pi\alpha/2$, where $\alpha$ is the fine structure constant.
[ { "created": "Thu, 13 Feb 2014 07:42:11 GMT", "version": "v1" } ]
2014-02-14
[ [ "Lee", "R. N.", "" ], [ "Milstein", "A. I.", "" ] ]
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1402.3066
Antonis Achilleos
Antonis Achilleos
Complexity Jumps In Multiagent Justification Logic Under Interacting Justifications
null
null
null
null
cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Logic of Proofs, LP, and its successor, Justification Logic, is a refinement of the modal logic approach to epistemology in which proofs/justifications are taken into account. In 2000 Kuznets showed that satisfiability for LP is in the second level of the polynomial hierarchy, a result which has been successfully repeated for all other one-agent justification logics whose complexity is known. We introduce a family of multi-agent justification logics with interactions between the agents' justifications, by extending and generalizing the two-agent versions of the Logic of Proofs introduced by Yavorskaya in 2008. Known concepts and tools from the single-agent justification setting are adjusted for this multiple agent case. We present tableau rules and some preliminary complexity results. In several cases the satisfiability problem for these logics remains in the second level of the polynomial hierarchy, while for others it is PSPACE or EXP-hard. Furthermore, this problem becomes PSPACE-hard even for certain two-agent logics, while there are EXP-hard logics of three agents.
[ { "created": "Thu, 13 Feb 2014 09:00:38 GMT", "version": "v1" }, { "created": "Sat, 26 Apr 2014 04:12:50 GMT", "version": "v2" } ]
2014-04-29
[ [ "Achilleos", "Antonis", "" ] ]
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1402.3067
Tobias Fritz
John C. Baez and Tobias Fritz
A Bayesian Characterization of Relative Entropy
32 pages, minor revision
Theory and Applications of Categories, Vol. 29 No. 16 (2014), 421-456
null
null
cs.IT math-ph math.IT math.MP math.PR quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We give a new characterization of relative entropy, also known as the Kullback-Leibler divergence. We use a number of interesting categories related to probability theory. In particular, we consider a category FinStat where an object is a finite set equipped with a probability distribution, while a morphism is a measure-preserving function $f: X \to Y$ together with a stochastic right inverse $s: Y \to X$. The function $f$ can be thought of as a measurement process, while s provides a hypothesis about the state of the measured system given the result of a measurement. Given this data we can define the entropy of the probability distribution on $X$ relative to the "prior" given by pushing the probability distribution on $Y$ forwards along $s$. We say that $s$ is "optimal" if these distributions agree. We show that any convex linear, lower semicontinuous functor from FinStat to the additive monoid $[0,\infty]$ which vanishes when $s$ is optimal must be a scalar multiple of this relative entropy. Our proof is independent of all earlier characterizations, but inspired by the work of Petz.
[ { "created": "Thu, 13 Feb 2014 09:02:27 GMT", "version": "v1" }, { "created": "Fri, 11 Jul 2014 12:24:57 GMT", "version": "v2" } ]
2017-08-22
[ [ "Baez", "John C.", "" ], [ "Fritz", "Tobias", "" ] ]
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1402.3070
Parth Gupta
Parth Gupta, Rafael E. Banchs and Paolo Rosso
Squeezing bottlenecks: exploring the limits of autoencoder semantic representation capabilities
null
null
null
null
cs.IR cs.LG stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a comprehensive study on the use of autoencoders for modelling text data, in which (differently from previous studies) we focus our attention on the following issues: i) we explore the suitability of two different models bDA and rsDA for constructing deep autoencoders for text data at the sentence level; ii) we propose and evaluate two novel metrics for better assessing the text-reconstruction capabilities of autoencoders; and iii) we propose an automatic method to find the critical bottleneck dimensionality for text language representations (below which structural information is lost).
[ { "created": "Thu, 13 Feb 2014 09:54:01 GMT", "version": "v1" } ]
2014-02-14
[ [ "Gupta", "Parth", "" ], [ "Banchs", "Rafael E.", "" ], [ "Rosso", "Paolo", "" ] ]
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1402.3072
Seyoung Yun
Se-Young Yun and Alexandre Proutiere
Community Detection via Random and Adaptive Sampling
null
null
null
null
cs.SI physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we consider networks consisting of a finite number of non-overlapping communities. To extract these communities, the interaction between pairs of nodes may be sampled from a large available data set, which allows a given node pair to be sampled several times. When a node pair is sampled, the observed outcome is a binary random variable, equal to 1 if nodes interact and to 0 otherwise. The outcome is more likely to be positive if nodes belong to the same communities. For a given budget of node pair samples or observations, we wish to jointly design a sampling strategy (the sequence of sampled node pairs) and a clustering algorithm that recover the hidden communities with the highest possible accuracy. We consider both non-adaptive and adaptive sampling strategies, and for both classes of strategies, we derive fundamental performance limits satisfied by any sampling and clustering algorithm. In particular, we provide necessary conditions for the existence of algorithms recovering the communities accurately as the network size grows large. We also devise simple algorithms that accurately reconstruct the communities when this is at all possible, hence proving that the proposed necessary conditions for accurate community detection are also sufficient. The classical problem of community detection in the stochastic block model can be seen as a particular instance of the problems consider here. But our framework covers more general scenarios where the sequence of sampled node pairs can be designed in an adaptive manner. The paper provides new results for the stochastic block model, and extends the analysis to the case of adaptive sampling.
[ { "created": "Thu, 13 Feb 2014 10:00:07 GMT", "version": "v1" }, { "created": "Wed, 19 Feb 2014 20:32:31 GMT", "version": "v2" } ]
2014-02-20
[ [ "Yun", "Se-Young", "" ], [ "Proutiere", "Alexandre", "" ] ]
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1402.3074
Parastoo Sadeghi
Ulric J. Ferner, Parastoo Sadeghi, Neda Aboutorab, and Muriel Medard
Scheduling Advantages of Network Coded Storage in Point-to-Multipoint Networks
null
null
null
null
cs.IT cs.NI math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider scheduling strategies for point-to-multipoint (PMP) storage area networks (SANs) that use network coded storage (NCS). In particular, we present a simple SAN system model, two server scheduling algorithms for PMP networks, and analytical expressions for internal and external blocking probability. We point to select scheduling advantages in NCS systems under normal operating conditions, where content requests can be temporarily denied owing to finite system capacity from drive I/O access or storage redundancy limitations. NCS can lead to improvements in throughput and blocking probability due to increased immediate scheduling options, and complements other well documented NCS advantages such as regeneration, and can be used as a guide for future storage system design.
[ { "created": "Thu, 13 Feb 2014 10:07:06 GMT", "version": "v1" } ]
2014-02-14
[ [ "Ferner", "Ulric J.", "" ], [ "Sadeghi", "Parastoo", "" ], [ "Aboutorab", "Neda", "" ], [ "Medard", "Muriel", "" ] ]
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1402.3075
Lukas Gilz Lukas Gilz
Lukas Gilz, Luis Rico-P\'erez and James R. Anglin
Decoherence of trapped bosons by buffer gas scattering: What length scales matter?
null
Phys. Rev. A 89, 052131 (2014)
10.1103/PhysRevA.89.052131
null
quant-ph physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We ask and answer a basic question about the length scales involved in quantum decoherence: how far apart in space do two parts of a quantum system have to be, before a common quantum environment decoheres them as if they were entirely separate? We frame this question specifically in a cold atom context. How far apart do two populations of bosons have to be, before an environment of thermal atoms of a different species (`buffer gas') responds to their two particle numbers separately? An initial guess for this length scale is the thermal coherence length of the buffer gas; we show that a standard Born-Markov treatment partially supports this guess, but predicts only inverse-square saturation of decoherence rates with distance, and not the much more abrupt Gaussian behavior of the buffer gas's first-order coherence. We confirm this Born-Markov result with a more rigorous theory, based on an exact solution of a two-scatterer scattering problem, which also extends the result beyond weak scattering. Finally, however, we show that when interactions within the buffer gas reservoir are taken into account, an abrupt saturation of the decoherence rate does occur, exponentially on the length scale of the buffer gas's mean free path.
[ { "created": "Thu, 13 Feb 2014 10:10:19 GMT", "version": "v1" } ]
2014-06-11
[ [ "Gilz", "Lukas", "" ], [ "Rico-Pérez", "Luis", "" ], [ "Anglin", "James R.", "" ] ]
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1402.3080
Santhy Viswam
Santhy Viswam and Sajeer Karattil
Software Requirement Specification Using Reverse Speech Technology
5 pages, International Journal of Computer Trends and Technology (IJCTT) vol.5 no.4
null
null
null
cs.CL cs.SD
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Speech analysis had been taken to a new level with the discovery of Reverse Speech (RS). RS is the discovery of hidden messages, referred as reversals, in normal speech. Works are in progress for exploiting the relevance of RS in different real world applications such as investigation, medical field etc. In this paper we represent an innovative method for preparing a reliable Software Requirement Specification (SRS) document with the help of reverse speech. As SRS act as the backbone for the successful completion of any project, a reliable method is needed to overcome the inconsistencies. Using RS such a reliable method for SRS documentation was developed.
[ { "created": "Thu, 13 Feb 2014 10:28:43 GMT", "version": "v1" } ]
2014-02-14
[ [ "Viswam", "Santhy", "" ], [ "Karattil", "Sajeer", "" ] ]
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1402.3088
Francesco Picano
Iman Lashgari and Francesco Picano and Wim-Paul Breugem and Luca Brandt
Laminar, turbulent and inertial shear-thickening regimes in channel flow of neutrally buoyant particle suspensions
appears in Physical Review Letters 2014
null
10.1103/PhysRevLett.113.254502
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The aim of this Letter is to characterize the flow regimes of suspensions of finite-size rigid particles in a viscous fluid at finite inertia. We explore the system behavior as function of the particle volume fraction and the Reynolds number (the ratio of flow and particle inertia to viscous forces). Unlike single phase flows where a clear distinction exists between the laminar and the turbulent states, three different regimes can be identified in the presence of a particulate phase, with smooth transitions between them. At low volume fractions, the flow becomes turbulent when increasing the Reynolds number, transitioning from the laminar regime dominated by viscous forces to the turbulent regime characterized by enhanced momentum transport by turbulent eddies. At larger volume fractions, we identify a new regime characterized by an even larger increase of the wall friction. The wall friction increases with the Reynolds number (inertial effects) while the turbulent transport is weakly affected, as in a state of intense inertial shear-thickening. This state may prevent the transition to a fully turbulent regime at arbitrary high speed of the flow.
[ { "created": "Thu, 13 Feb 2014 11:05:38 GMT", "version": "v1" }, { "created": "Fri, 14 Nov 2014 15:22:18 GMT", "version": "v2" } ]
2015-06-18
[ [ "Lashgari", "Iman", "" ], [ "Picano", "Francesco", "" ], [ "Breugem", "Wim-Paul", "" ], [ "Brandt", "Luca", "" ] ]
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1402.3089
Moshe Schwartz
Moshe Schwartz and Ehud Perlsman
Sensitivity of Yield Optimized Superoscillations
null
null
null
null
physics.data-an cond-mat.stat-mech
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Super oscillating signals are band limited signals that oscillate in some region faster than their largest Fourier component. Such signals have many obvious scientific and technological applications, yet their practical use is strongly limited by the fact that an overwhelming proportion of the energy goes into that part of the signal, which is not superoscillating. In a recent article the problem of optimization of such signals has been studied. In that article the concept of superoscillation yield is defined as the ratio of the energy in the super oscillations to the total energy of the signal, given the range in time and frequency of the superoscillations, which is imposed by forcing the signal to interpolate among a set of predetermined points. The optimization of the superoscillation yield consists of obtaining the Fourier coefficients of the low frequency components of which the signal consists, that maximize the yield under the interpolation constraint. Since in practical applications it is impossible to determine the Fourier coefficients with infinite precision, it is necessary to answer two questions. The first is how is the superoscillating nature of the signal affected by random small deviations in those Fourier coefficients and the second is how is the yield affected? These are the questions addressed in the present article. Limits on the necessary precision are obtained. Those limits seem not to be impractical.
[ { "created": "Thu, 13 Feb 2014 11:08:18 GMT", "version": "v1" } ]
2014-02-18
[ [ "Schwartz", "Moshe", "" ], [ "Perlsman", "Ehud", "" ] ]
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1402.3091
Jeffrey Shallit
Christopher Drexler-Lemire and Jeffrey Shallit
Notes and Note-Pairs in Noergaard's Infinity Series
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null
null
null
math.CO cs.DM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Danish composer Per Noergaard defined the "infinity series" s = (s(n))_n>=0 by the rules s(0) = 0, s(2n) = -s(n) for n >= 1, and s(2n + 1) = s(n) + 1 for n >= 0; it figures prominently in many of his compositions. Here we give several new results about this sequence: first, the set of binary representations of the positions of each note forms a context-free language that is not regular; second, a complete characterization of exactly which note-pairs appear; third, that consecutive occurrences of identical phrases are widely separated. We also consider to what extent the infinity series is unique.
[ { "created": "Thu, 13 Feb 2014 11:21:10 GMT", "version": "v1" } ]
2014-02-14
[ [ "Drexler-Lemire", "Christopher", "" ], [ "Shallit", "Jeffrey", "" ] ]
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1402.3092
Ivan Vartaniants
A. Singer, U. Lorenz, A. Marras, A. Klyuev, J. Becker, K. Schlage, P. Skopintsev, O. Gorobtsov, A. Shabalin, H.-C. Wille, H. Franz, H. Graafsma, and I. A. Vartanyants
Intensity interferometry of single x-ray pulses from a synchrotron storage ring
16 pages, 6 figures, 42 references
Phys. Rev. Lett. 113, 064801, /1-4 (2014)
10.1103/PhysRevLett.113.064801
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We report on measurements of second-order intensity correlations at the high brilliance storage ring PETRA III using a prototype of the newly developed Adaptive Gain Integrating Pixel Detector (AGIPD). The detector recorded individual synchrotron radiation pulses with an x-ray photon energy of 14.4 keV and repetition rate of about 5 MHz. The second-order intensity correlation function was measured simultaneously at different spatial separations that allowed to determine the transverse coherence length at these x-ray energies. The measured values are in a good agreement with theoretical simulations based on the Gaussian Schell-model.
[ { "created": "Thu, 13 Feb 2014 11:28:43 GMT", "version": "v1" } ]
2014-11-06
[ [ "Singer", "A.", "" ], [ "Lorenz", "U.", "" ], [ "Marras", "A.", "" ], [ "Klyuev", "A.", "" ], [ "Becker", "J.", "" ], [ "Schlage", "K.", "" ], [ "Skopintsev", "P.", "" ], [ "Gorobtsov", "O.", "" ], [ "Shabalin", "A.", "" ], [ "Wille", "H. -C.", "" ], [ "Franz", "H.", "" ], [ "Graafsma", "H.", "" ], [ "Vartanyants", "I. A.", "" ] ]
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1402.3094
Bijaya Sahoo Dr.
Madhulita Das, B. K. Sahoo, Sourav Pal
Relativistic Spectroscopy of Plasma Embedded Li-like Systems with the Screening Effects in the Two-body Debye Potentials
5 tables and 10 figures
null
10.1088/0953-4075/47/17/175701
null
physics.atom-ph physics.optics physics.plasm-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The spectroscopic properties of Li atom and Li-like Ca and Ti ions in the plasma environment are investigated using a relativistic coupled-cluster (RCC) method. Assuming the plasma is of low density and very hot, we consider the Debye model with two approximations by accounting the screening effects: (i) in the nuclear potential alone and (ii) in both the nuclear and the electron-electron interaction potentials. First, the calculations for the energies and the lifetimes of the atomic states are carried out for the plasma free systems in order to check their accuracies following which they are investigated in the plasma environment. It is observed that screenings in the electron-electron interaction potentials stabilize the systems more than the case when the screenings present only in the nuclear potential. Similarly, the earlier predicted blue and red shifts in the $\Delta n=0$ and $\Delta n \ne 0$ transition lines (with the principal quantum number $n$) of the Li-like ions change significantly in the case (ii) approximation. The level-crossings among the energy levels are observed for the large screening effects which seem to be prominent in the states of higher orbital angular momentum. The lifetimes of many low-lying states and the relative line-intensities of the allowed transitions are estimated considering different plasma screening strengths.
[ { "created": "Thu, 13 Feb 2014 11:33:57 GMT", "version": "v1" } ]
2015-06-18
[ [ "Das", "Madhulita", "" ], [ "Sahoo", "B. K.", "" ], [ "Pal", "Sourav", "" ] ]
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1402.3096
Irfan Deli research
Irfan Deli and Naim \c{C}a\u{g}man
Relations on FP-Soft Sets Applied to Decision Making Problems
soft applications
Journal of New Theory 3 (2015) 98-107
null
null
math.LO cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this work, we first define relations on the fuzzy parametrized soft sets and study their properties. We also give a decision making method based on these relations. In approximate reasoning, relations on the fuzzy parametrized soft sets have shown to be of a primordial importance. Finally, the method is successfully applied to a problems that contain uncertainties.
[ { "created": "Thu, 13 Feb 2014 11:39:27 GMT", "version": "v1" } ]
2016-02-12
[ [ "Deli", "Irfan", "" ], [ "Çağman", "Naim", "" ] ]
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1402.3105
Stefan Hickel PhD
Stefan Hickel
DNS and LES of two-phase flows with cavitation
Keynote Lecture ERCOFTAC Workshop DLES 9, April 3-5, 2013, Dresden, Germany. to appear in Direct and Large-Eddy Simulation IX, Springer
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null
null
physics.flu-dyn physics.comp-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We report on recent progress in the physical and numerical modeling of compressible two-phase flows that involve phase transition between the liquid and gaseous state of the fluid. The high-speed dynamics of cavitation bubbles is studied in well-resolved simulations (DNS) with a sharp-interface numerical model on a micro scale. The underlying assumption of the employed evaporation/condensation model is that phase change occurs in thermal non-equilibrium and that the associated timescale is larger than that of the wave dynamics. Results for the collapse of a spherical vapor bubble close to a solid wall are discussed for three different bubble-wall configurations. The major challenge for such numerical investigations is to accurately reproduce the dynamics of the interface between liquid and vapor during the entire collapse process, including the high-speed dynamics of the late stages, where compressibility of both phases plays a decisive role. Direct interface resolving simulations are intractable for real world technical applications such as turbulent flows involving cavitation clouds with millions of vapor bubbles and a wide range of time and length scales. For this reason, we developed a coarse grained model for large-eddy simulation (LES) of turbulent two-phase flows with cavitation. In LES, vapor bubbles constitute sub-grid scales that have to be modeled accordingly. On the grid scale, we solve the compressible Navier-Stokes equations for a homogeneous mixture of liquid and vapor. For deriving an appropriate equation of state, we assume that the characteristic time scale of phase change is much smaller than the numerical time step and that phase change is isentropic and in mechanical equilibrium at the saturation pressure. This macroscopic model is applied to realistic technical problems and to more generic flows to study the mutual interaction of turbulence and cavitation.
[ { "created": "Thu, 13 Feb 2014 12:21:03 GMT", "version": "v1" } ]
2014-02-14
[ [ "Hickel", "Stefan", "" ] ]
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1402.3107
Abdelhafid Zitouni
Zitouni Abdelhafid
Rigorous Description Of Design Components Functionality: An Approach Based Contract
10pages, 7 figures
IJCSI : International Journal of Computer Science Issues, ISSN: 1694-0814, Vol. 9, Issue. 1, pp 187-196, January 2012
null
null
cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Current models for software components have made component-based software engineering practical. However, these models are limited in the sense that their support for the characterization/specification of design components primarily deals with syntactic issues. To avoid mismatch and misuse of components, more comprehensive specification of software components is required, In this paper, we present a contract-based approach to analyze and model the both aspects (functional and non-functional) properties of design components and their composition in order to detect and correct composition errors. This approach permits to characterize the structural, interface and behavioural aspects of design component. To enable this we present a pattern contract language that captures the structural and behavioral requirements associated with a range of patterns, as well as the system properties that are guaranteed as a result. In addition, we propose the use of the LOTOS language as an ADL for formalizing these aspects. We illustrate the approach by applying it to a standard design
[ { "created": "Thu, 13 Feb 2014 12:25:34 GMT", "version": "v1" } ]
2014-02-14
[ [ "Abdelhafid", "Zitouni", "" ] ]
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1402.3117
Michael Sarrazin
Aline Emplit, Jian Xiang Lian, Isabelle Huynen, Alexandru Vlad, Michael Sarrazin
Colloidal pattern replication through contact photolithography operated in a "Talbot-Fabry-Perot" regime
12 pages, 7 figures, 1 table. Published in Nanotechnology
Nanotechnology 25 (2014) 145303
10.1088/0957-4484/25/14/145303
null
physics.optics cond-mat.mes-hall cond-mat.mtrl-sci
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We detail on a continuous colloidal pattern replication by using contact photolithography. Chrome on quartz masks are fabricated using colloidal nanosphere lithography and subsequently used as photolithography stamps. Hexagonal pattern arrangements with different dimensions (980, 620 and 480 nm, using colloidal particles with respective diameters) have been studied. When the mask and the imaged resist layer were in intimate contact, a high fidelity pattern replica was obtained after photolithography exposure and processing. In turn, the presence of an air-gap in between has been found to affect the projected image onto the photoresist layer, strongly dependent on the mask feature size and air-gap height. Pattern replication, inversion and hybridization was achieved for 980 nm-period mask; no hybridization for the 620 nm; and only pattern replication for the 480 nm. These results are interpreted in the framework of a "Talbot-Fabry-Perot" effect. Numerical simulations corroborate with the experimental findings providing insight into the involved processes highlighting the important parameters affecting the exposure pattern. The approach allows complex subwavelength patterning and is relevant for a 3D layer-by-layer printing.
[ { "created": "Thu, 13 Feb 2014 13:07:46 GMT", "version": "v1" } ]
2014-03-18
[ [ "Emplit", "Aline", "" ], [ "Lian", "Jian Xiang", "" ], [ "Huynen", "Isabelle", "" ], [ "Vlad", "Alexandru", "" ], [ "Sarrazin", "Michael", "" ] ]
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1402.3119
Vasilis Ntranos
Vasilis Ntranos, Mohammad Ali Maddah-Ali, Giuseppe Caire
Cellular Interference Alignment
null
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Interference alignment promises that, in Gaussian interference channels, each link can support half of a degree of freedom (DoF) per pair of transmit-receive antennas. However, in general, this result requires to precode the data bearing signals over a signal space of asymptotically large diversity, e.g., over an infinite number of dimensions for time-frequency varying fading channels, or over an infinite number of rationally independent signal levels, in the case of time-frequency invariant channels. In this work we consider a wireless cellular system scenario where the promised optimal DoFs are achieved with linear precoding in one-shot (i.e., over a single time-frequency slot). We focus on the uplink of a symmetric cellular system, where each cell is split into three sectors with orthogonal intra-sector multiple access. In our model, interference is "local", i.e., it is due to transmitters in neighboring cells only. We consider a message-passing backhaul network architecture, in which nearby sectors can exchange already decoded messages and propose an alignment solution that can achieve the optimal DoFs. To avoid signaling schemes relying on the strength of interference, we further introduce the notion of \emph{topologically robust} schemes, which are able to guarantee a minimum rate (or DoFs) irrespectively of the strength of the interfering links. Towards this end, we design an alignment scheme which is topologically robust and still achieves the same optimum DoFs.
[ { "created": "Thu, 13 Feb 2014 13:10:05 GMT", "version": "v1" } ]
2014-02-14
[ [ "Ntranos", "Vasilis", "" ], [ "Maddah-Ali", "Mohammad Ali", "" ], [ "Caire", "Giuseppe", "" ] ]
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1402.3120
Emeric Balogh
Emeric Balogh, Katalin Kov\'acs, Valer Tosa and Katalin Varj\'u
A case study for terahertz-assisted single attosecond pulse generation
null
J. Phys. B: At. Mol. Opt. Phys. 45, 074022 (2012)
10.1088/0953-4075/45/7/074022
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We numerically investigate the use of strong THz radiation in assisting single attosecond pulse generation by few-cycle, 800 nm laser pulses. We optimize focusing conditions to generate short and powerful single attosecond pulses of high-energy photons by keeping the parameters of the THz field within the limits achieved experimentally. We show that using optimal focusing geometry isolated attosecond pulses shorter than 100 as can be obtained even in the absence of further gating or XUV compression techniques, using an 8 fs generating pulse. Furthermore, quantum path control of short- and long-trajectory components is demonstrated by varying the delay between the THz and IR pulses.
[ { "created": "Thu, 13 Feb 2014 13:15:31 GMT", "version": "v1" } ]
2014-02-14
[ [ "Balogh", "Emeric", "" ], [ "Kovács", "Katalin", "" ], [ "Tosa", "Valer", "" ], [ "Varjú", "Katalin", "" ] ]
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1402.3125
Sune K. Jakobsen
Sune K Jakobsen
Information Theoretical Cryptogenography
34 pages, 1 figure
null
null
null
cs.CR cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider problems where $n$ people are communicating and a random subset of them is trying to leak information, without making it clear who are leaking the information. We introduce a measure of suspicion, and show that the amount of leaked information will always be bounded by the expected increase in suspicion, and that this bound is tight. We ask the question: Suppose a large number of people have some information they want to leak, but they want to ensure that after the communication, an observer will assign probability at most $c$ to the events that each of them is trying to leak the information. How much information can they reliably leak, per person who is leaking? We show that the answer is $- \frac{\log(1-c)}{c} -\log(e)$ bits.
[ { "created": "Thu, 13 Feb 2014 13:33:06 GMT", "version": "v1" } ]
2014-02-14
[ [ "Jakobsen", "Sune K", "" ] ]
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1402.3128
Wei-Chun Chu
Wei-Chun Chu, Toru Morishita, and C. D. Lin
Probing dipole-forbidden autoionizing states by isolated attosecond pulses
10 pages, 6 figures
Physical Review A 89, 033427 (2014)
10.1103/PhysRevA.89.033427
null
physics.atom-ph quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose a general technique to retrieve the information of dipole-forbidden resonances in the autoionizing region. In the simulation, a helium atom is pumped by an isolated attosecond pulse in the extreme ultraviolet (EUV) combined with a few-femtosecond laser pulse. The excited wave packet consists of the $^1S$, $^1P$, and $^1D$ states, including the background continua, near the $2s2p(^1P)$ doubly excited state. The resultant electron spectra with various laser intensities and time delays between the EUV and laser pulses are obtained by a multilevel model and an ab initio time-dependent Schr\"odinger equation calculation. By taking the ab initio calculation as a "virtual measurement", the dipole-forbidden resonances are characterized by the multilevel model. We found that in contrast to the common assumption, the nonresonant coupling between the continua plays a significant role in the time-delayed electron spectra, which shows the correlation effect between photoelectrons before they leave the core. This technique takes the advantages of ultrashort pulses uniquely and would be a timely test for the current attosecond technology.
[ { "created": "Thu, 13 Feb 2014 13:42:25 GMT", "version": "v1" }, { "created": "Thu, 27 Mar 2014 14:58:19 GMT", "version": "v2" } ]
2014-03-28
[ [ "Chu", "Wei-Chun", "" ], [ "Morishita", "Toru", "" ], [ "Lin", "C. D.", "" ] ]
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1402.3129
J\"orn Schwandt
Joern Schwandt, Eckhart Fretwurst, Robert Klanner, Ioannis Kopsalis, Jiaguo Zhang
Design and First Tests of a Radiation-Hard Pixel Sensor for the European X-Ray Free-Electron Laser
null
null
10.1109/TNS.2014.2304239
null
physics.ins-det
http://creativecommons.org/licenses/by-nc-sa/3.0/
The high intensity and high repetition rate of the European X-ray Free-Electron Laser, presently under construction in Hamburg, requires silicon sensors which can stand X-ray doses of up to 1 GGy for 3 years of operation at high bias voltage. Within the AGIPD Collaboration the X-ray-radiation damage in MOS Capacitors and Gate-Controlled Diodes fabricated by four vendors on high-ohmic n-type silicon with two crystal orientations and dif- ferent technological parameters, has been studied for doses between 1 kGy and 1 GGy. The extracted values of oxide-charge and surface-current densi- ties have been used in TCAD simulations, and the layout and technological parameters of the AGIPD pixel sensor optimized. It is found that the op- timized layout for high X-ray doses is significantly different from the one for non-irradiated sensors. First sensors and test structures have been de-livered in early 2013. Measurement results for X-ray doses of 0 to 10 MGy and their comparison to simulations are presented. They demonstrate that the optimization has been successful and that the sensors fulfill the required specifications.
[ { "created": "Thu, 13 Feb 2014 13:43:56 GMT", "version": "v1" } ]
2015-06-18
[ [ "Schwandt", "Joern", "" ], [ "Fretwurst", "Eckhart", "" ], [ "Klanner", "Robert", "" ], [ "Kopsalis", "Ioannis", "" ], [ "Zhang", "Jiaguo", "" ] ]
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1402.3132
Martin Leder
Martin Leder, Christopher Grossert and Martin Weitz
Veselago lensing with ultracold atoms in an optical lattice
null
Nature Communications 5, 3327 (2014)
10.1038/ncomms4327
null
physics.optics physics.atom-ph quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Veselago pointed out that electromagnetic wave theory allows for materials with a negative index of refraction, in which most known optical phenomena would be reversed. A slab of such a material can focus light by negative refraction, an imaging technique strikingly different from conventional positive refractive index optics, where curved surfaces bend the rays to form an image of an object. Here we demonstrate Veselago lensing for matter waves, using ultracold atoms in an optical lattice. A relativistic, i.e. photon-like, dispersion relation for rubidium atoms is realized with a bichromatic optical lattice potential. We rely on a Raman $\pi$-pulse technique to transfer atoms between two different branches of the dispersion relation, resulting in a focusing completely analogous to the effect described by Veselago for light waves. Future prospects of the demonstrated effects include novel sub-de Broglie wave imaging applications.
[ { "created": "Thu, 13 Feb 2014 13:50:45 GMT", "version": "v1" } ]
2014-02-17
[ [ "Leder", "Martin", "" ], [ "Grossert", "Christopher", "" ], [ "Weitz", "Martin", "" ] ]
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