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1401.5315
Mudhahir Al-Ajmi
Arbab I. Arbab and Mudhahir Al-Ajmi
The quaternionic commutator bracket and its implications
8 pages
Symmetry 2018, 10(10), 513
10.3390/sym10100513
null
physics.gen-ph quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A quaternionic commutator bracket for position and momentum shows that the quaternionic wave function, \emph{viz.} $\widetilde{\psi}=(\frac{i}{c}\,\psi_0\,,\vec{\psi})$, represents a state of a particle with orbital angular momentum, $L=3\,\hbar$, resulting from the internal structure of the particle. This angular momentum can be attributed to spin of the particle. The vector $\vec{\psi}$, points along the direction of $\vec{L}$. When a charged particle is placed in an electromagnetic fields the interaction energy reveals that the magnetic moments interact with the electric and magnetic fields giving rise to terms similar to Aharonov-Bohm and Aharonov-Casher effects.
[ { "created": "Tue, 21 Jan 2014 13:34:54 GMT", "version": "v1" }, { "created": "Thu, 25 Oct 2018 09:55:10 GMT", "version": "v2" } ]
2018-10-26
[ [ "Arbab", "Arbab I.", "" ], [ "Al-Ajmi", "Mudhahir", "" ] ]
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1401.5316
Hsin-Hao Su
Hsin-Hao Su
A Distributed Minimum Cut Approximation Scheme
null
null
null
null
cs.DS cs.DC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we study the problem of approximating the minimum cut in a distributed message-passing model, the CONGEST model. The minimum cut problem has been well-studied in the context of centralized algorithms. However, there were no known non-trivial algorithms in the distributed model until the recent work of Ghaffari and Kuhn. They gave algorithms for finding cuts of size $O(\epsilon^{-1}\lambda)$ and $(2+\epsilon)\lambda$ in $O(D)+\tilde{O}(n^{1/2+\epsilon})$ rounds and $\tilde{O}(D+\sqrt{n})$ rounds respectively, where $\lambda$ is the size of the minimum cut. This matches the lower bound they provided up to a polylogarithmic factor. Yet, no scheme that achieves $(1+\epsilon)$-approximation ratio is known. We give a distributed algorithm that finds a cut of size $(1+\epsilon)\lambda$ in $\tilde{O}(D+\sqrt{n})$ time, which is optimal up to polylogarithmic factors.
[ { "created": "Tue, 21 Jan 2014 13:39:38 GMT", "version": "v1" } ]
2014-01-22
[ [ "Su", "Hsin-Hao", "" ] ]
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1401.5320
Ranjana Prakash
Ranjana Prakash and Ajay K. Yadav
Measurement of Anomalous Moments of Creation and Annihilation Operators
4 pages, 1 Figure
null
null
null
physics.optics quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose a scheme for measurements of anomalous moments of creation and annihilation operators requiring only one beam splitter, only one photodetector and not many measurements with phase-shift $\varphi$ in homodyning. This has advantageous over scheme of Shchukin and Vogel [Phys. Rev. A 72, 043808 (2005)] which requires many photodetectors, many beam splitters and a large number of measurements with phase-shift $\varphi$ as a Fourier transform is calculated integrating over $\varphi$.
[ { "created": "Tue, 21 Jan 2014 14:20:29 GMT", "version": "v1" } ]
2014-01-22
[ [ "Prakash", "Ranjana", "" ], [ "Yadav", "Ajay K.", "" ] ]
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1401.5321
Wook Jung
Wook Jung and Shih-Chun Chang
An Integer Programming Approach to UEP Coding for Multiuser Broadcast Channels
submitted to ISIT 2014
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, an integer programming approach is introduced to construct Unequal Error Protection (UEP) codes for multiuser broadcast channels. We show that the optimal codes can be constructed that satisfy the integer programming bound. Based on the bound, we compute asymptotic code rate and perform throughput analysis for the degraded broadcast channel.
[ { "created": "Tue, 21 Jan 2014 14:20:34 GMT", "version": "v1" } ]
2014-01-22
[ [ "Jung", "Wook", "" ], [ "Chang", "Shih-Chun", "" ] ]
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1401.5323
Manuel Linsenmeier
Manuel Linsenmeier and Salvatore Pascale and Valerio Lucarini
Climate of Earth-like planets with high obliquity and eccentric orbits: implications for habitability conditions
16 figures, 3 tables
null
10.1016/j.pss.2014.11.003
null
astro-ph.EP physics.ao-ph physics.geo-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We explore the effects of seasonal variability for the climate of Earth-like planets as determined by the two parameters polar obliquity and orbital eccentricity using a general circulation model of intermediate complexity. In the first part of the paper we examine the consequences of different values of obliquity and eccentricity for the spatio-temporal patterns of radiation and surface temperatures as well as for the main characteristics of the atmospheric circulations. In the second part we analyse the associated implications for the habitability of planets close to the outer edge of the habitable zone (HZ). This part of the paper focuses in particular on the multistability property of climate, i.e. the parallel existence of both an ice-free and an ice-covered climate state. Our results show that seasonal variability affects both the existence of and transitions between the two climate states. Moreover, our experiments reveal that planets with Earth-like atmospheres and high seasonal variability can have ice-free areas at much larger distance from the host star than planets without seasonal variability, which leads to a substantial expansion of the outer edge of the HZ. Sensitivity experiments exploring the role of azimuthal obliquity and surface heat capacity test the robustness of our results. On circular orbits, our findings obtained with a general circulation model agree well with previous studies based on one dimensional energy balance models, whereas significant differences are found on eccentric orbits.
[ { "created": "Tue, 21 Jan 2014 14:22:06 GMT", "version": "v1" }, { "created": "Sat, 3 May 2014 14:15:19 GMT", "version": "v2" }, { "created": "Tue, 8 Jul 2014 10:54:33 GMT", "version": "v3" }, { "created": "Thu, 9 Oct 2014 22:57:40 GMT", "version": "v4" } ]
2014-12-02
[ [ "Linsenmeier", "Manuel", "" ], [ "Pascale", "Salvatore", "" ], [ "Lucarini", "Valerio", "" ] ]
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1401.5325
Samson Abramsky
Samson Abramsky and Radha jagadeesan
Game Semantics for Access Control
21 pages
In Proceedings of MFPS 25, Electronic Notes in Theoretical Computer Science, Vol. 249, pages 135-156, 2009
null
null
cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We introduce a semantic approach to the study of logics for access control and dependency analysis, based on Game Semantics. We use a variant of AJM games with explicit justification (but without pointers). Based on this, we give a simple and intuitive model of the information flow constraints underlying access control. This is used to give strikingly simple proofs of \emph{non-interference theorems} in robust, semantic versions.
[ { "created": "Tue, 21 Jan 2014 14:24:55 GMT", "version": "v1" } ]
2014-01-22
[ [ "Abramsky", "Samson", "" ], [ "jagadeesan", "Radha", "" ] ]
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1401.5327
Dimitri Kartsaklis
Dimitri Kartsaklis
Compositional Operators in Distributional Semantics
null
null
10.1007/s40362-014-0017-z
null
cs.CL cs.AI math.CT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This survey presents in some detail the main advances that have been recently taking place in Computational Linguistics towards the unification of the two prominent semantic paradigms: the compositional formal semantics view and the distributional models of meaning based on vector spaces. After an introduction to these two approaches, I review the most important models that aim to provide compositionality in distributional semantics. Then I proceed and present in more detail a particular framework by Coecke, Sadrzadeh and Clark (2010) based on the abstract mathematical setting of category theory, as a more complete example capable to demonstrate the diversity of techniques and scientific disciplines that this kind of research can draw from. This paper concludes with a discussion about important open issues that need to be addressed by the researchers in the future.
[ { "created": "Tue, 21 Jan 2014 14:28:01 GMT", "version": "v1" } ]
2014-05-14
[ [ "Kartsaklis", "Dimitri", "" ] ]
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1401.5330
Mohamed A. El-Sayed
Mohamed A. El-Sayed, S. Abdel-Khalek, and Hanan H. Amin
Study of Neural Network Algorithm for Straight-Line Drawings of Planar Graphs
null
International Journal of Computer Science and Information Security (IJCSIS) ISSN 1947-5500, Vol. 9, No. 9, pp. 13-19, 2011
null
null
cs.CG cs.NE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Graph drawing addresses the problem of finding a layout of a graph that satisfies given aesthetic and understandability objectives. The most important objective in graph drawing is minimization of the number of crossings in the drawing, as the aesthetics and readability of graph drawings depend on the number of edge crossings. VLSI layouts with fewer crossings are more easily realizable and consequently cheaper. A straight-line drawing of a planar graph G of n vertices is a drawing of G such that each edge is drawn as a straight-line segment without edge crossings. However, a problem with current graph layout methods which are capable of producing satisfactory results for a wide range of graphs is that they often put an extremely high demand on computational resources. This paper introduces a new layout method, which nicely draws internally convex of planar graph that consumes only little computational resources and does not need any heavy duty preprocessing. Here, we use two methods: The first is self organizing map known from unsupervised neural networks which is known as (SOM) and the second method is Inverse Self Organized Map (ISOM).
[ { "created": "Tue, 21 Jan 2014 14:45:02 GMT", "version": "v1" } ]
2014-01-22
[ [ "El-Sayed", "Mohamed A.", "" ], [ "Abdel-Khalek", "S.", "" ], [ "Amin", "Hanan H.", "" ] ]
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1401.5333
Robert Prevedel
R. Prevedel, Y.-G. Yoon, M. Hoffmann, N. Pak, G. Wetzstein, S. Kato, T. Schr\"odel, R. Raskar, M. Zimmer, E.S. Boyden, A. Vaziri
Simultaneous whole-animal 3D-imaging of neuronal activity using light field microscopy
25 pages, 7 figures, incl. supplementary information
Nature Methods 11, 727 (2014)
10.1038/nmeth.2964
null
physics.optics q-bio.NC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
3D functional imaging of neuronal activity in entire organisms at single cell level and physiologically relevant time scales faces major obstacles due to trade-offs between the size of the imaged volumes, and spatial and temporal resolution. Here, using light-field microscopy in combination with 3D deconvolution, we demonstrate intrinsically simultaneous volumetric functional imaging of neuronal population activity at single neuron resolution for an entire organism, the nematode Caenorhabditis elegans. The simplicity of our technique and possibility of the integration into epi-fluoresence microscopes makes it an attractive tool for high-speed volumetric calcium imaging.
[ { "created": "Tue, 21 Jan 2014 14:53:14 GMT", "version": "v1" }, { "created": "Mon, 22 Dec 2014 09:58:09 GMT", "version": "v2" } ]
2014-12-23
[ [ "Prevedel", "R.", "" ], [ "Yoon", "Y. -G.", "" ], [ "Hoffmann", "M.", "" ], [ "Pak", "N.", "" ], [ "Wetzstein", "G.", "" ], [ "Kato", "S.", "" ], [ "Schrödel", "T.", "" ], [ "Raskar", "R.", "" ], [ "Zimmer", "M.", "" ], [ "Boyden", "E. S.", "" ], [ "Vaziri", "A.", "" ] ]
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1401.5334
Laurent Michel D
Laurent Michel and Pascal Van Hentenryck
A Microkernel Architecture for Constraint Programming
null
null
null
null
cs.AI cs.PL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper presents a microkernel architecture for constraint programming organized around a number of small number of core functionalities and minimal interfaces. The architecture contrasts with the monolithic nature of many implementations. Experimental results indicate that the software engineering benefits are not incompatible with runtime efficiency.
[ { "created": "Tue, 21 Jan 2014 14:56:14 GMT", "version": "v1" } ]
2014-01-22
[ [ "Michel", "Laurent", "" ], [ "Van Hentenryck", "Pascal", "" ] ]
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1401.5338
Jan Leike
Jan Leike and Matthias Heizmann
Ranking Templates for Linear Loops
TACAS 2014
null
null
null
cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a new method for the constraint-based synthesis of termination arguments for linear loop programs based on linear ranking templates. Linear ranking templates are parametrized, well-founded relations such that an assignment to the parameters gives rise to a ranking function. This approach generalizes existing methods and enables us to use templates for many different ranking functions with affine-linear components. We discuss templates for multiphase, piecewise, and lexicographic ranking functions. Because these ranking templates require both strict and non-strict inequalities, we use Motzkin's Transposition Theorem instead of Farkas Lemma to transform the generated $\exists\forall$-constraint into an $\exists$-constraint.
[ { "created": "Tue, 21 Jan 2014 15:09:14 GMT", "version": "v1" } ]
2014-01-22
[ [ "Leike", "Jan", "" ], [ "Heizmann", "Matthias", "" ] ]
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1401.5339
Noah Friedkin
Noah E. Friedkin
Complex Objects in the Polytopes of the Linear State-Space Process
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null
null
null
math.OC cs.MA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A simple object (one point in $m$-dimensional space) is the resultant of the evolving matrix polynomial of walks in the irreducible aperiodic network structure of the first order DeGroot (weighted averaging) state-space process. This paper draws on a second order generalization the DeGroot model that allows complex object resultants, i.e, multiple points with distinct coordinates, in the convex hull of the initial state-space. It is shown that, holding network structure constant, a unique solution exists for the particular initial space that is a sufficient condition for the convergence of the process to a specified complex object. In addition, it is shown that, holding network structure constant, a solution exists for dampening values sufficient for the convergence of the process to a specified complex object. These dampening values, which modify the values of the walks in the network, control the system's outcomes, and any strongly connected typology is a sufficient condition of such control.
[ { "created": "Tue, 21 Jan 2014 15:17:35 GMT", "version": "v1" } ]
2014-01-22
[ [ "Friedkin", "Noah E.", "" ] ]
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1401.5341
Laurent Michel D
Pascal Van Hentenryck and Laurent Michel
Domain Views for Constraint Programming
Workshop: TRICS13: Techniques foR Implementing Constraint programming, September 2013, CP, Uppsala
null
null
null
cs.AI cs.PL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Views are a standard abstraction in constraint programming: They make it possible to implement a single version of each constraint, while avoiding to create new variables and constraints that would slow down propagation. Traditional constraint-programming systems provide the concept of {\em variable views} which implement a view of the type $y = f(x)$ by delegating all (domain and constraint) operations on variable $y$ to variable $x$. This paper proposes the alternative concept of {\em domain views} which only delegate domain operations. Domain views preserve the benefits of variable views but simplify the implementation of value-based propagation. Domain views also support non-injective views compositionally, expanding the scope of views significantly. Experimental results demonstrate the practical benefits of domain views.
[ { "created": "Tue, 21 Jan 2014 15:22:29 GMT", "version": "v1" } ]
2014-01-22
[ [ "Van Hentenryck", "Pascal", "" ], [ "Michel", "Laurent", "" ] ]
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1401.5342
Michael Atlan
Antoine Dill\'ee, Romain Cancilliere, Fernando Lopes, Michael Atlan
Video-rate computational heterodyne holography
null
null
10.1364/OL.39.002090
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a versatile computational image rendering software of optically-acquired holograms. The reported software can process 4 Megapixel 8-bit raw frames from a sensor array acquired at a sustained rate of 80 Hz. Video-rate image rendering is achieved by streamline image processing with commodity computer graphics hardware. For time-averaged holograms acquired in off-axis optical configuration with a frequency-shifted reference beam, wide-field imaging of one tunable spectral component is permitted. This software is validated by phase-stepped hologram rendering, and non-contact monitoring of surface acoustic waves by single and dual sideband hologram rendering. It demonstrates the suitability of holography for video-rate computational laser Doppler imaging in heterodyne optical configuration.
[ { "created": "Tue, 21 Jan 2014 15:23:32 GMT", "version": "v1" } ]
2015-06-18
[ [ "Dillée", "Antoine", "" ], [ "Cancilliere", "Romain", "" ], [ "Lopes", "Fernando", "" ], [ "Atlan", "Michael", "" ] ]
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1401.5344
Michael Atlan
Francois Bruno, J\'er\^ome Laurent, Daniel Royer, Michael Atlan
Holographic imaging of surface acoustic waves
null
Applied Physics Letters 104 (2014) 083504
10.1063/1.4866390
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We report on an experimental demonstration of surface acoustic waves monitoring on a thin metal plate with heterodyne optical holography. Narrowband imaging of local optical pathlength modulation is achieved with a frequency-tunable time-averaged laser Doppler holographic imaging scheme on a sensor array, at video-rate. This method enables robust and quantitative mapping of out-of-plane vibrations of nanometric amplitudes at radiofrequencies.
[ { "created": "Tue, 21 Jan 2014 15:24:14 GMT", "version": "v1" }, { "created": "Tue, 18 Mar 2014 18:09:44 GMT", "version": "v2" } ]
2014-03-19
[ [ "Bruno", "Francois", "" ], [ "Laurent", "Jérôme", "" ], [ "Royer", "Daniel", "" ], [ "Atlan", "Michael", "" ] ]
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1401.5346
Malcolm McRoberts
Malcolm McRoberts
Software Licensing in the Cloud Age
null
International Journal of Soft Computing and Software Engineering [JSCSE], Vol. 3, No. 3, pp. 395-402, 2013
10.7321/jscse.v3.n3.60
null
cs.CY cs.DC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Cloud computing represents a major shift in information systems architecture, combining both new deployment models and new business models. Rapid provisioning, elastic scaling, and metered usage are essential characteristics of cloud services, and they require cloud resources with these same characteristics. When cloud services depend on commercial software, the licenses for that software become another resource to be managed by the cloud. This paper examines common licensing models, including open source, and how well they function in a cloud services model. It discusses creative, new, cloud-centric licensing models and how they allow providers to preserve and expand their revenue streams as their partners and customers transition to the cloud. The paper concludes by identifying the next steps to achieve standardized, cloud-friendly licensing models.
[ { "created": "Tue, 21 Jan 2014 15:25:04 GMT", "version": "v1" } ]
2014-01-22
[ [ "McRoberts", "Malcolm", "" ] ]
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1401.5347
Jan Leike
Matthias Heizmann, Jochen Hoenicke, Jan Leike, Andreas Podelski
Linear Ranking for Linear Lasso Programs
ATVA 2013
null
null
null
cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The general setting of this work is the constraint-based synthesis of termination arguments. We consider a restricted class of programs called lasso programs. The termination argument for a lasso program is a pair of a ranking function and an invariant. We present the---to the best of our knowledge---first method to synthesize termination arguments for lasso programs that uses linear arithmetic. We prove a completeness theorem. The completeness theorem establishes that, even though we use only linear (as opposed to non-linear) constraint solving, we are able to compute termination arguments in several interesting cases. The key to our method lies in a constraint transformation that replaces a disjunction by a sum.
[ { "created": "Tue, 21 Jan 2014 15:27:07 GMT", "version": "v1" } ]
2014-01-22
[ [ "Heizmann", "Matthias", "" ], [ "Hoenicke", "Jochen", "" ], [ "Leike", "Jan", "" ], [ "Podelski", "Andreas", "" ] ]
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1401.5351
Jan Leike
Jan Leike
Ranking Function Synthesis for Linear Lasso Programs
Master's Thesis
null
null
null
cs.LO
http://creativecommons.org/licenses/by/3.0/
The scope of this work is the constraint-based synthesis of termination arguments for the restricted class of programs called linear lasso programs. A termination argument consists of a ranking function as well as a set of supporting invariants. We extend existing methods in several ways. First, we use Motzkin's Transposition Theorem instead of Farkas' Lemma. This allows us to consider linear lasso programs that can additionally contain strict inequalities. Existing methods are restricted to non-strict inequalities and equalities. Second, we consider several kinds of ranking functions: affine-linear, piecewise and lexicographic ranking functions. Moreover, we present a novel kind of ranking function called multiphase ranking function which proceeds through a fixed number of phases such that for each phase, there is an affine-linear ranking function. As an abstraction to the synthesis of specific ranking functions, we introduce the notion ranking function template. This enables us to handle all ranking functions in a unified way. Our method relies on non-linear algebraic constraint solving as a subroutine which is known to scale poorly to large problems. As a mitigation we formalize an assessment of the difficulty of our constraints and present an argument why they are of an easier kind than general non-linear constraints. We prove our method to be complete: if there is a termination argument of the form specified by the given ranking function template with a fixed number of affine-linear supporting invariants, then our method will find a termination argument. To our knowledge, the approach we propose is the most powerful technique of synthesis-based discovery of termination arguments for linear lasso programs and encompasses and enhances several methods having been proposed thus far.
[ { "created": "Tue, 21 Jan 2014 15:36:43 GMT", "version": "v1" } ]
2014-01-22
[ [ "Leike", "Jan", "" ] ]
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1401.5353
Blake Barker
Blake Barker
STABLAB Documentation for KdV : Numerical proof of stability of roll waves in the small-amplitude limit for inclined thin film flow
Documentation, 255 pages
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null
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cs.MS cs.NA math.NA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We document the MATLAB code used in the following study: Numerical proof of stability of roll waves in the small-amplitude limit for inclined thin film flow.
[ { "created": "Tue, 21 Jan 2014 15:43:52 GMT", "version": "v1" } ]
2014-01-22
[ [ "Barker", "Blake", "" ] ]
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1401.5354
Tillmann Miltzow
Andrei Asinowski, Bal\'azs Keszegh and Tillmann Miltzow
Counting Houses of Pareto Optimal Matchings in the House Allocation Problem
24 pages 2 Figures revised
null
null
null
math.CO cs.CC cs.DM cs.GT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let $A,B$ with $|A| = m$ and $|B| = n\ge m$ be two sets. We assume that every element $a\in A$ has a reference list over all elements from $B$. We call an injective mapping $\tau$ from $A$ to $B$ a matching. A blocking coalition of $\tau$ is a subset $A'$ of $A$ such that there exists a matching $\tau'$ that differs from $\tau$ only on elements of $A'$, and every element of $A'$ improves in $\tau'$, compared to $\tau$ according to its preference list. If there exists no blocking coalition, we call the matching $\tau$ an exchange stable matching (ESM). An element $b\in B$ is reachable if there exists an exchange stable matching using $b$. The set of all reachable elements is denoted by $E^*$. We show \[|E^*| \leq \sum_{i = 1,\ldots, m}{\left\lfloor\frac{m}{i}\right\rfloor} = \Theta(m\log m).\] This is asymptotically tight. A set $E\subseteq B$ is reachable (respectively exactly reachable) if there exists an exchange stable matching $\tau$ whose image contains $E$ as a subset (respectively equals $E$). We give bounds for the number of exactly reachable sets. We find that our results hold in the more general setting of multi-matchings, when each element $a$ of $A$ is matched with $\ell_a$ elements of $B$ instead of just one. Further, we give complexity results and algorithms for corresponding algorithmic questions. Finally, we characterize unavoidable elements, i.e., elements of $B$ that are used by all ESM's. This yields efficient algorithms to determine all unavoidable elements.
[ { "created": "Tue, 21 Jan 2014 15:44:22 GMT", "version": "v1" }, { "created": "Mon, 14 Apr 2014 14:53:54 GMT", "version": "v2" }, { "created": "Wed, 7 Oct 2015 14:27:53 GMT", "version": "v3" }, { "created": "Thu, 17 Mar 2016 10:59:11 GMT", "version": "v4" } ]
2016-03-18
[ [ "Asinowski", "Andrei", "" ], [ "Keszegh", "Balázs", "" ], [ "Miltzow", "Tillmann", "" ] ]
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1401.5360
Janis Noetzel
H. Boche, J. Noetzel
Positivity, Discontinuity, Finite Resources and Nonzero Error for Arbitrarily Varying Quantum Channels
19 pages, no figures. Corrected typos. Large parts of the introduction are rewritten, especially the historical part from the earlier verions is completely deleted. This version contains an additional theorem (Theorem 5) which summarizes our findings concerning the points of discontinuity of the deterministic message transmission capacity
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10.1063/1.4902930
null
quant-ph cs.IT math-ph math.IT math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This work is motivated by a quite general question: Under which circumstances are the capacities of information transmission systems continuous? The research is explicitly carried out on arbitrarily varying quantum channels (AVQCs). We give an explicit example that answers the recent question whether the transmission of messages over AVQCs can benefit from distribution of randomness between the legitimate sender and receiver in the affirmative. The specific class of channels introduced in that example is then extended to show that the deterministic capacity does have discontinuity points, while that behaviour is, at the same time, not generic: We show that it is continuous around its positivity points. This is in stark contrast to the randomness-assisted capacity, which is always continuous in the channel. Our results imply that the deterministic message transmission capacity of an AVQC can be discontinuous only in points where it is zero, while the randomness assisted capacity is nonzero. Apart from the zero-error capacities, this is the first result that shows a discontinuity of a capacity for a large class of quantum channels. The continuity of the respective capacity for memoryless quantum channels had, among others, been listed as an open problem on the problem page of the ITP Hannover for about six years before it was proven to be continuous. We also quantify the interplay between the distribution of finite amounts of randomness between the legitimate sender and receiver, the (nonzero) decoding error with respect to the average error criterion that can be achieved over a finite number of channel uses and the number of messages that can be sent. This part of our results also applies to entanglement- and strong subspace transmission. In addition, we give a new sufficient criterion for the entanglement transmission capacity with randomness assistance to vanish.
[ { "created": "Tue, 21 Jan 2014 16:03:15 GMT", "version": "v1" }, { "created": "Wed, 26 Feb 2014 17:05:19 GMT", "version": "v2" }, { "created": "Wed, 7 May 2014 10:41:09 GMT", "version": "v3" } ]
2015-06-18
[ [ "Boche", "H.", "" ], [ "Noetzel", "J.", "" ] ]
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1401.5364
Kiran Sree Pokkuluri Prof
Pokkuluri Kiran Sree, Inampudi Ramesh Babu, SSSN Usha Devi N
HMACA: Towards Proposing a Cellular Automata Based Tool for Protein Coding, Promoter Region Identification and Protein Structure Prediction
null
International Journal of Research in Computer Applications & Information Technology, Volume 1, Issue 1, July-September, 2013, pp. 26-31
null
null
cs.CE cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Human body consists of lot of cells, each cell consist of DeOxaRibo Nucleic Acid (DNA). Identifying the genes from the DNA sequences is a very difficult task. But identifying the coding regions is more complex task compared to the former. Identifying the protein which occupy little place in genes is a really challenging issue. For understating the genes coding region analysis plays an important role. Proteins are molecules with macro structure that are responsible for a wide range of vital biochemical functions, which includes acting as oxygen, cell signaling, antibody production, nutrient transport and building up muscle fibers. Promoter region identification and protein structure prediction has gained a remarkable attention in recent years. Even though there are some identification techniques addressing this problem, the approximate accuracy in identifying the promoter region is closely 68% to 72%. We have developed a Cellular Automata based tool build with hybrid multiple attractor cellular automata (HMACA) classifier for protein coding region, promoter region identification and protein structure prediction which predicts the protein and promoter regions with an accuracy of 76%. This tool also predicts the structure of protein with an accuracy of 80%.
[ { "created": "Tue, 21 Jan 2014 16:15:29 GMT", "version": "v1" } ]
2014-01-22
[ [ "Sree", "Pokkuluri Kiran", "" ], [ "Babu", "Inampudi Ramesh", "" ], [ "N", "SSSN Usha Devi", "" ] ]
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1401.5367
Roberto Lopez-Herrejon
Roberto E. Lopez-Herrejon, Javier Ferrer, Francisco Chicano, Evelyn Nicole Haslinger, Alexander Egyed, Enrique Alba
Towards a Benchmark and a Comparison Framework for Combinatorial Interaction Testing of Software Product Lines
null
null
null
null
cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
As Software Product Lines (SPLs) are becoming a more pervasive development practice, their effective testing is becoming a more important concern. In the past few years many SPL testing approaches have been proposed, among them, are those that support Combinatorial Interaction Testing (CIT) whose premise is to select a group of products where faults, due to feature interactions, are more likely to occur. Many CIT techniques for SPL testing have been put forward; however, no systematic and comprehensive comparison among them has been performed. To achieve such goal two items are important: a common benchmark of feature models, and an adequate comparison framework. In this research-in-progress paper, we propose 19 feature models as the base of a benchmark, which we apply to three different techniques in order to analyze the comparison framework proposed by Perrouin et al. We identify the shortcomings of this framework and elaborate alternatives for further study.
[ { "created": "Tue, 21 Jan 2014 16:20:24 GMT", "version": "v1" } ]
2014-01-22
[ [ "Lopez-Herrejon", "Roberto E.", "" ], [ "Ferrer", "Javier", "" ], [ "Chicano", "Francisco", "" ], [ "Haslinger", "Evelyn Nicole", "" ], [ "Egyed", "Alexander", "" ], [ "Alba", "Enrique", "" ] ]
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1401.5382
Tharun Prasath M
M. Tharun Prasath
Continuous Speech Recognition Based on Deterministic Finite Automata Machine using Utterance and Pitch Verification
null
null
null
null
cs.FL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper introduces a set of acoustic modeling techniques for utterance verification (UV) based continuous speech recognition (CSR). Utterance verification in this work implies the ability to determine when portions of a hypothesized word string correspond to incorrectly decoded vocabulary words or out-of-vocabulary words that may appear in an utterance. This capability is implemented here as a likelihood ratio (LR). There are two UV techniques that are presented here. The first is voice verification along with the vocabulary testing, at the same time the parameters for UV models are generated based on the optimization criterion which is directly related to the LR measure. The second technique is a pitch recognition based on weighted finite-state transducers. These transducers provide a common and natural representation for major components of speech recognition systems, including hidden Markov models (HMMs), context-dependency models, pronunciation dictionaries, statistical grammars, and word or phone lattices. The finite state machine processes the acoustic parameters of UV models. The results of an experimental study presented in the paper shows that LR based parameter estimation results in a significant improvement in UV performance for this task. The study also found that the use of the LR based weighted finite-state transducers along with the UV, can provide as much as an 11% improvement in UV performance when compared to existing UV procedures. Finally, it was also found that the performance of the finite state machine was highly dependent on the use of the LR criterion in training acoustic models. Several observations are made in the paper concerning the formation of confidence measures for UV and the interaction of these techniques with statistical language models.
[ { "created": "Tue, 21 Jan 2014 16:51:07 GMT", "version": "v1" } ]
2014-01-22
[ [ "Prasath", "M. Tharun", "" ] ]
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1401.5383
Rayan Chikhi
Rayan Chikhi, Antoine Limasset, Shaun Jackman, Jared Simpson and Paul Medvedev
On the representation of de Bruijn graphs
Journal version (JCB). A preliminary version of this article was published in the proceedings of RECOMB 2014
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null
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q-bio.QM cs.DS q-bio.GN
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The de Bruijn graph plays an important role in bioinformatics, especially in the context of de novo assembly. However, the representation of the de Bruijn graph in memory is a computational bottleneck for many assemblers. Recent papers proposed a navigational data structure approach in order to improve memory usage. We prove several theoretical space lower bounds to show the limitation of these types of approaches. We further design and implement a general data structure (DBGFM) and demonstrate its use on a human whole-genome dataset, achieving space usage of 1.5 GB and a 46% improvement over previous approaches. As part of DBGFM, we develop the notion of frequency-based minimizers and show how it can be used to enumerate all maximal simple paths of the de Bruijn graph using only 43 MB of memory. Finally, we demonstrate that our approach can be integrated into an existing assembler by modifying the ABySS software to use DBGFM.
[ { "created": "Tue, 21 Jan 2014 16:55:02 GMT", "version": "v1" }, { "created": "Wed, 22 Jan 2014 16:53:37 GMT", "version": "v2" }, { "created": "Fri, 14 Feb 2014 22:55:09 GMT", "version": "v3" }, { "created": "Mon, 6 Oct 2014 12:39:56 GMT", "version": "v4" } ]
2014-10-07
[ [ "Chikhi", "Rayan", "" ], [ "Limasset", "Antoine", "" ], [ "Jackman", "Shaun", "" ], [ "Simpson", "Jared", "" ], [ "Medvedev", "Paul", "" ] ]
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1401.5387
Petar Jurcevic
P. Jurcevic, B. P. Lanyon, P. Hauke, C. Hempel, P. Zoller, R. Blatt, C. F. Roos
Observation of entanglement propagation in a quantum many-body system
[v1]: 11 pages, 4 figures, 4 extended data figures; [v2]: Update Reference [26], for Complentary work see also arXiv:1401.5088; [v3]: Update acknowledgments
Nature 511, 202 (2014)
10.1038/nature13461
null
quant-ph cond-mat.mes-hall cond-mat.quant-gas cond-mat.supr-con physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The key to explaining a wide range of quantum phenomena is understanding how entanglement propagates around many-body systems. Furthermore, the controlled distribution of entanglement is of fundamental importance for quantum communication and computation. In many situations, quasiparticles are the carriers of information around a quantum system and are expected to distribute entanglement in a fashion determined by the system interactions. Here we report on the observation of magnon quasiparticle dynamics in a one-dimensional many-body quantum system of trapped ions representing an Ising spin model. Using the ability to tune the effective interaction range, and to prepare and measure the quantum state at the individual particle level, we observe new quasiparticle phenomena. For the first time, we reveal the entanglement distributed by quasiparticles around a many-body system. Second, for long-range interactions we observe the divergence of quasiparticle velocity and breakdown of the light-cone picture that is valid for short-range interactions. Our results will allow experimental studies of a wide range of phenomena, such as quantum transport, thermalisation, localisation and entanglement growth, and represent a first step towards a new quantum-optical regime with on-demand quasiparticles with tunable non-linear interactions.
[ { "created": "Tue, 21 Jan 2014 17:18:33 GMT", "version": "v1" }, { "created": "Wed, 22 Jan 2014 12:48:07 GMT", "version": "v2" }, { "created": "Fri, 24 Jan 2014 13:49:47 GMT", "version": "v3" } ]
2014-07-16
[ [ "Jurcevic", "P.", "" ], [ "Lanyon", "B. P.", "" ], [ "Hauke", "P.", "" ], [ "Hempel", "C.", "" ], [ "Zoller", "P.", "" ], [ "Blatt", "R.", "" ], [ "Roos", "C. F.", "" ] ]
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1401.5389
Sajib Dasgupta
Sajib Dasgupta, Vincent Ng
Which Clustering Do You Want? Inducing Your Ideal Clustering with Minimal Feedback
null
Journal Of Artificial Intelligence Research, Volume 39, pages 581-632, 2010
10.1613/jair.3003
null
cs.IR cs.CL cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
While traditional research on text clustering has largely focused on grouping documents by topic, it is conceivable that a user may want to cluster documents along other dimensions, such as the authors mood, gender, age, or sentiment. Without knowing the users intention, a clustering algorithm will only group documents along the most prominent dimension, which may not be the one the user desires. To address the problem of clustering documents along the user-desired dimension, previous work has focused on learning a similarity metric from data manually annotated with the users intention or having a human construct a feature space in an interactive manner during the clustering process. With the goal of reducing reliance on human knowledge for fine-tuning the similarity function or selecting the relevant features required by these approaches, we propose a novel active clustering algorithm, which allows a user to easily select the dimension along which she wants to cluster the documents by inspecting only a small number of words. We demonstrate the viability of our algorithm on a variety of commonly-used sentiment datasets.
[ { "created": "Thu, 16 Jan 2014 04:56:03 GMT", "version": "v1" } ]
2014-01-22
[ [ "Dasgupta", "Sajib", "" ], [ "Ng", "Vincent", "" ] ]
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1401.5390
S.R.K. Branavan
S.R.K. Branavan, David Silver, Regina Barzilay
Learning to Win by Reading Manuals in a Monte-Carlo Framework
null
Journal Of Artificial Intelligence Research, Volume 43, pages 661-704, 2012
10.1613/jair.3484
null
cs.CL cs.AI cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Domain knowledge is crucial for effective performance in autonomous control systems. Typically, human effort is required to encode this knowledge into a control algorithm. In this paper, we present an approach to language grounding which automatically interprets text in the context of a complex control application, such as a game, and uses domain knowledge extracted from the text to improve control performance. Both text analysis and control strategies are learned jointly using only a feedback signal inherent to the application. To effectively leverage textual information, our method automatically extracts the text segment most relevant to the current game state, and labels it with a task-centric predicate structure. This labeled text is then used to bias an action selection policy for the game, guiding it towards promising regions of the action space. We encode our model for text analysis and game playing in a multi-layer neural network, representing linguistic decisions via latent variables in the hidden layers, and game action quality via the output layer. Operating within the Monte-Carlo Search framework, we estimate model parameters using feedback from simulated games. We apply our approach to the complex strategy game Civilization II using the official game manual as the text guide. Our results show that a linguistically-informed game-playing agent significantly outperforms its language-unaware counterpart, yielding a 34% absolute improvement and winning over 65% of games when playing against the built-in AI of Civilization.
[ { "created": "Sat, 18 Jan 2014 21:10:57 GMT", "version": "v1" } ]
2014-01-22
[ [ "Branavan", "S. R. K.", "" ], [ "Silver", "David", "" ], [ "Barzilay", "Regina", "" ] ]
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1401.5391
Dominic Orchard
Dominic Orchard, Tomas Petricek, Alan Mycroft
The semantic marriage of monads and effects
extended abstract
null
null
null
cs.PL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Wadler and Thiemann unified type-and-effect systems with monadic semantics via a syntactic correspondence and soundness results with respect to an operational semantics. They conjecture that a general, "coherent" denotational semantics can be given to unify effect systems with a monadic-style semantics. We provide such a semantics based on the novel structure of an indexed monad, which we introduce. We redefine the semantics of Moggi's computational lambda-calculus in terms of (strong) indexed monads which gives a one-to-one correspondence between indices of the denotations and the effect annotations of traditional effect systems. Dually, this approach yields indexed comonads which gives a unified semantics and effect system to contextual notions of effect (called coeffects), which we have previously described.
[ { "created": "Tue, 21 Jan 2014 17:23:45 GMT", "version": "v1" } ]
2014-01-22
[ [ "Orchard", "Dominic", "" ], [ "Petricek", "Tomas", "" ], [ "Mycroft", "Alan", "" ] ]
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1401.5394
Thomas Varghese
Sven Schewe, Thomas Varghese
Determinising Parity Automata
null
Proceedings of MFCS 2014, Springer-Verlag Lecture Notes in Computer Science Vol. 8634(1): pp 486-498
10.1007/978-3-662-44522-8_41
null
cs.FL cs.GT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Parity word automata and their determinisation play an important role in automata and game theory. We discuss a determinisation procedure for nondeterministic parity automata through deterministic Rabin to deterministic parity automata. We prove that the intermediate determinisation to Rabin automata is optimal. We show that the resulting determinisation to parity automata is optimal up to a small constant. Moreover, the lower bound refers to the more liberal Streett acceptance. We thus show that determinisation to Streett would not lead to better bounds than determinisation to parity. As a side-result, this optimality extends to the determinisation of B\"uchi automata.
[ { "created": "Tue, 21 Jan 2014 17:32:51 GMT", "version": "v1" } ]
2014-09-12
[ [ "Schewe", "Sven", "" ], [ "Varghese", "Thomas", "" ] ]
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1401.5401
Yongpeng Wu
Yongpeng Wu, Chao-Kai Wen, Chengshan Xiao, Xiqi Gao, and Robert Schober
Linear MIMO Precoding in Jointly-Correlated Fading Multiple Access Channels with Finite Alphabet Signaling
7 pages, 2 figures, accepted for ICC14
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we investigate the design of linear precoders for multiple-input multiple-output (MIMO) multiple access channels (MAC). We assume that statistical channel state information (CSI) is available at the transmitters and consider the problem under the practical finite alphabet input assumption. First, we derive an asymptotic (in the large-system limit) weighted sum rate (WSR) expression for the MIMO MAC with finite alphabet inputs and general jointly-correlated fading. Subsequently, we obtain necessary conditions for linear precoders maximizing the asymptotic WSR and propose an iterative algorithm for determining the precoders of all users. In the proposed algorithm, the search space of each user for designing the precoding matrices is its own modulation set. This significantly reduces the dimension of the search space for finding the precoding matrices of all users compared to the conventional precoding design for the MIMO MAC with finite alphabet inputs, where the search space is the combination of the modulation sets of all users. As a result, the proposed algorithm decreases the computational complexity for MIMO MAC precoding design with finite alphabet inputs by several orders of magnitude. Simulation results for finite alphabet signalling indicate that the proposed iterative algorithm achieves significant performance gains over existing precoder designs, including the precoder design based on the Gaussian input assumption, in terms of both the sum rate and the coded bit error rate.
[ { "created": "Tue, 21 Jan 2014 18:03:39 GMT", "version": "v1" } ]
2014-01-22
[ [ "Wu", "Yongpeng", "" ], [ "Wen", "Chao-Kai", "" ], [ "Xiao", "Chengshan", "" ], [ "Gao", "Xiqi", "" ], [ "Schober", "Robert", "" ] ]
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1401.5402
Kyle McEnery Mr
K. R. McEnery, M. S. Tame, S. A. Maier, M. S. Kim
Tunable negative permeability in a quantum plasmonic metamaterial
11 pages, 6 figures
Phys. Rev. A 89, 013822 (2014)
10.1103/PhysRevA.89.013822
null
quant-ph physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider the integration of quantum emitters into a negative permeability metamaterial design in order to introduce tunability as well as nonlinear behavior. The unit cell of our metamaterial is a ring of metamolecules, each consisting of a metal nanoparticle and a two-level semiconductor quantum dot (QD). Without the QDs, the ring of the unit cell is known to act as an artificial optical magnetic resonator. By adding the QDs we show that a Fano interference profile is introduced into the magnetic field scattered from the ring. This induced interference is shown to cause an appreciable effect in the collective magnetic resonance of the unit cell. We find that the interference provides a means to tune the response of the negative permeability metamaterial. The exploitation of the QD's inherent nonlinearity is proposed to modulate the metamaterial's magnetic response with a separate control field.
[ { "created": "Tue, 21 Jan 2014 18:03:50 GMT", "version": "v1" } ]
2014-01-22
[ [ "McEnery", "K. R.", "" ], [ "Tame", "M. S.", "" ], [ "Maier", "S. A.", "" ], [ "Kim", "M. S.", "" ] ]
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1401.5404
Adam Kaminski
Rui Jiang, Daixiang Mou, Yun Wu, Lunan Huang, Colin D. McMillen, Joseph Kolis, Henry G. Giesber III, John J. Egan, Adam Kaminski
Tunable VUV laser based spectrometer for Angle Resolved Photoemission Spectroscopy (ARPES)
6 pages, 4 figures
Review of Scienctific Instruments 85, 033902 (2014)
10.1063/1.4867517
null
physics.optics cond-mat.str-el
http://creativecommons.org/licenses/publicdomain/
We have developed an angle-resolved photoemission spectrometer with tunable VUV laser as a photon source. The photon source is based on the fourth harmonic generation of a near IR beam from a Ti:sapphire laser pumped by a CW green laser and tunable between 5.3eV and 7eV. The most important part of the set-up is a compact, vacuum enclosed fourth harmonic generator based on KBBF crystals, grown hydrothermally in the US. This source can deliver a photon flux of over 10^14 photons/s. We demonstrate that this energy range is sufficient to measure the kz dispersion in an iron arsenic high temperature superconductor, which was previously only possible at synchrotron facilities.
[ { "created": "Tue, 21 Jan 2014 18:08:30 GMT", "version": "v1" } ]
2017-03-21
[ [ "Jiang", "Rui", "" ], [ "Mou", "Daixiang", "" ], [ "Wu", "Yun", "" ], [ "Huang", "Lunan", "" ], [ "McMillen", "Colin D.", "" ], [ "Kolis", "Joseph", "" ], [ "Giesber", "Henry G.", "III" ], [ "Egan", "John J.", "" ], [ "Kaminski", "Adam", "" ] ]
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1401.5407
Thanuka Wickramarathne
J Xu, TL Wickramarathne, EK Grey, K Steinhaeuser, R Keller, J Drake, N Chawla and DM Lodge
Patterns of Ship-borne Species Spread: A Clustering Approach for Risk Assessment and Management of Non-indigenous Species Spread
null
null
null
null
cs.SI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The spread of non-indigenous species (NIS) through the global shipping network (GSN) has enormous ecological and economic cost throughout the world. Previous attempts at quantifying NIS invasions have mostly taken "bottom-up" approaches that eventually require the use of multiple simplifying assumptions due to insufficiency and/or uncertainty of available data. By modeling implicit species exchanges via a graph abstraction that we refer to as the Species Flow Network (SFN), a different approach that exploits the power of network science methods in extracting knowledge from largely incomplete data is presented. Here, coarse-grained species flow dynamics are studied via a graph clustering approach that decomposes the SFN to clusters of ports and inter-cluster connections. With this decomposition of ports in place, NIS flow among clusters can be very efficiently reduced by enforcing NIS management on a few chosen inter-cluster connections. Furthermore, efficient NIS management strategy for species exchanges within a cluster (often difficult due higher rate of travel and pathways) are then derived in conjunction with ecological and environmental aspects that govern the species establishment. The benefits of the presented approach include robustness to data uncertainties, implicit incorporation of "stepping-stone" spread of invasive species, and decoupling of species spread and establishment risk estimation. Our analysis of a multi-year (1997--2006) GSN dataset using the presented approach shows the existence of a few large clusters of ports with higher intra-cluster species flow that are fairly stable over time. Furthermore, detailed investigations were carried out on vessel types, ports, and inter-cluster connections. Finally, our observations are discussed in the context of known NIS invasions and future research directions are also presented.
[ { "created": "Tue, 21 Jan 2014 18:13:57 GMT", "version": "v1" } ]
2014-01-22
[ [ "Xu", "J", "" ], [ "Wickramarathne", "TL", "" ], [ "Grey", "EK", "" ], [ "Steinhaeuser", "K", "" ], [ "Keller", "R", "" ], [ "Drake", "J", "" ], [ "Chawla", "N", "" ], [ "Lodge", "DM", "" ] ]
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1401.5418
Daniel Dault
Daniel Dault, Naveen V. Nair, Jie Li, Balasubramaniam Shanker
The Generalized Method of Moments for Electromagnetic Boundary Integral Equations
15 pages
null
10.1109/TAP.2014.2315205
null
physics.comp-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Generalized Method of Moments (GMM) is a partition of unity based technique for solving electromagnetic and acoustic boundary integral equations. Past work on the GMM for electromagnetics was confined to geometries modeled by piecewise flat tessellations and suffered from spurious internal line charges. In the present article, we redesign the GMM scheme and demonstrate its ability to model scattering from PEC scatterers composed of mixtures of smooth and non-smooth geometrical features. Furthermore, we demonstrate that because the partition of unity provides function and effective geometrical continuity between patches, the GMM permits mixtures of local geometry descriptions and approximation function spaces with significantly more freedom than traditional moment methods.
[ { "created": "Tue, 21 Jan 2014 18:55:52 GMT", "version": "v1" } ]
2015-06-18
[ [ "Dault", "Daniel", "" ], [ "Nair", "Naveen V.", "" ], [ "Li", "Jie", "" ], [ "Shanker", "Balasubramaniam", "" ] ]
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1401.5423
Kevin Cossel
Kang-Kuen Ni, Huanqian Loh, Matt Grau, Kevin C. Cossel, Jun Ye, Eric A. Cornell
State-specific detection of trapped HfF$^+$ by photodissociation
4 pages, 5 figures
null
10.1016/j.jms.2014.02.001
null
physics.atom-ph physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We use (1+1$'$) resonance-enhanced multiphoton photodissociation (REMPD) to detect the population in individual rovibronic states of trapped HfF$^+$ with a single-shot absolute efficiency of 18%, which is over 200 times better than that obtained with fluorescence detection. The first photon excites a specific rotational level to an intermediate vibronic band at 35,000-36,500 cm$^{-1}$, and the second photon, at 37,594 cm$^{-1}$ (266 nm), dissociates HfF$^+$ into Hf$^+$ and F. Mass-resolved time-of-flight ion detection then yields the number of state-selectively dissociated ions. Using this method, we observe rotational-state heating of trapped HfF$^+$ ions from collisions with neutral Ar atoms. Furthermore, we measure the lifetime of the $^3\Delta_1$ $v=0,\, J=1$ state to be 2.1(2) s. This state will be used for a search for a permanent electric dipole moment of the electron.
[ { "created": "Tue, 21 Jan 2014 19:07:36 GMT", "version": "v1" } ]
2015-06-18
[ [ "Ni", "Kang-Kuen", "" ], [ "Loh", "Huanqian", "" ], [ "Grau", "Matt", "" ], [ "Cossel", "Kevin C.", "" ], [ "Ye", "Jun", "" ], [ "Cornell", "Eric A.", "" ] ]
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1401.5424
Roy Hayes Jr
Roy Hayes, Peter Beling, William Scherer
Real Time Strategy Language
null
null
null
null
cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Real Time Strategy (RTS) games provide complex domain to test the latest artificial intelligence (AI) research. In much of the literature, AI systems have been limited to playing one game. Although, this specialization has resulted in stronger AI gaming systems it does not address the key concerns of AI researcher. AI researchers seek the development of AI agents that can autonomously interpret learn, and apply new knowledge. To achieve human level performance, current AI systems rely on game specific knowledge of an expert. The paper presents the full RTS language in hopes of shifting the current research focus to the development of general RTS agents. General RTS agents are AI gaming systems that can play any RTS games, defined in the RTS language. This prevents game specific knowledge from being hard coded into the system, thereby facilitating research that addresses the fundamental concerns of artificial intelligence.
[ { "created": "Tue, 21 Jan 2014 19:14:22 GMT", "version": "v1" } ]
2014-01-22
[ [ "Hayes", "Roy", "" ], [ "Beling", "Peter", "" ], [ "Scherer", "William", "" ] ]
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1401.5430
Michael Atlan
Francois Bruno, J\'er\^ome Laurent, Claire Prada, Benjamin Lamboul, Bruno Passilly, Michael Atlan
Non-destructive testing of composite plates by holographic vibrometry
null
null
10.1063/1.4871178
null
physics.optics physics.ins-det
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We report on a wide-field optical monitoring method for revealing local delaminations in sandwich-type composite plates at video-rate by holographic vibrometry. Non-contact measurements of low frequency flexural waves is performed with time-averaged heterodyne holography. It enables narrowband imaging of local out-of-plane nanometric vibration amplitudes under sinusoidal excitation, and reveals delamination defects, which cause local resonances of flexural waves. The size of the defect can be estimated from the first resonance frequency of the flexural wave and the mechanical parameters of the observed layer of the composite plate.
[ { "created": "Tue, 21 Jan 2014 19:35:04 GMT", "version": "v1" } ]
2015-06-18
[ [ "Bruno", "Francois", "" ], [ "Laurent", "Jérôme", "" ], [ "Prada", "Claire", "" ], [ "Lamboul", "Benjamin", "" ], [ "Passilly", "Bruno", "" ], [ "Atlan", "Michael", "" ] ]
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1401.5433
Boumahdi Fatima Mme
Fatima Boumahdi, Rachid Chalal
SoaDssPm: A new Service-Oriented Architecture of the decision support system for the Project Management
International Conference on Control, Engineering Information Technology (CEIT'13)
Economics & Strategic Management of Business Process (ESMB) vol 1; pp. 6-10, 2013
null
null
cs.SE
http://creativecommons.org/licenses/by/3.0/
This paper presents an architecture for the Project Management, which is defined using the concepts behind ServiceOriented and Decision Support System. The framework described, denominated as SoaDssPm, represents the following: a coherent solution to the problem of control Project Management the existing gap between the real execution of Project Management by describing the business process and relationships required by a SOA solution, and its objectives representation, in which the decisional aspects determine the final shape of the system, providing decision support to the identified business processes and constraints.
[ { "created": "Tue, 21 Jan 2014 19:40:24 GMT", "version": "v1" } ]
2014-01-22
[ [ "Boumahdi", "Fatima", "" ], [ "Chalal", "Rachid", "" ] ]
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1401.5435
Takeyasu Ito
T. M. Ito, D. H. Beck, S. M. Clayton, C. Crawford, S. A. Currie, W. C. Griffith, J. C. Ramsey, A. L. Roberts, R. Schmid, G. M. Seidel, D. Wagner, W. Yao
High electric field development for the SNS nEDM Experiment
3 pages, based on a talk given at the High Voltage in Noble Liquids (HVNL13) Workshop, FNAL, 8-9 November 2013
null
null
LA-UR-13-29211
physics.ins-det nucl-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A new experiment to search for the permanent electric dipole moment of the neutron is being developed for installation at the Spallation Neutron Source at Oak Ridge National Laboratory. This experiment will be performed in liquid helium at ? 0:4 K and requires a large electric field (E ~ 75 kV/cm) to be applied in liquid helium. We have constructed a new HV test apparatus to study electric breakdown in liquid helium. Initial results demonstrated that it is possible to apply fields exceeding 100 kV/cm in a 1 cm gap between two electropolished stainless steel electrodes12 cm in diameter for a wide range of pressures.
[ { "created": "Tue, 21 Jan 2014 19:43:25 GMT", "version": "v1" } ]
2014-01-22
[ [ "Ito", "T. M.", "" ], [ "Beck", "D. H.", "" ], [ "Clayton", "S. M.", "" ], [ "Crawford", "C.", "" ], [ "Currie", "S. A.", "" ], [ "Griffith", "W. C.", "" ], [ "Ramsey", "J. C.", "" ], [ "Roberts", "A. L.", "" ], [ "Schmid", "R.", "" ], [ "Seidel", "G. M.", "" ], [ "Wagner", "D.", "" ], [ "Yao", "W.", "" ] ]
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1401.5437
Pawel Tecmer
Matthieu Mottet, Pawel Tecmer, Katharina Boguslawski, Ors Legeza and Markus Reiher
Quantum Entanglement in Carbon-Carbon, Carbon-Phosphorus and Silicon-Silicon Bonds
9 figures, 8 pages
Phys. Chem. Chem. Phys., 16, 8872-8880 (2014)
10.1039/C4CP00277F
null
cond-mat.str-el physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The chemical bond is an important local concept to understand chemical compounds and processes. Unfortunately, like most local concepts, the chemical bond and the bond order do not correspond to any physical observable and thus cannot be determined as an expectation value of a quantum chemical operator. We recently demonstrated [Boguslawski et al., J. Chem. Theory Comput., 2013, 9, 2959--2973] that one- and two-orbital-based entanglement measures can be applied to interpret electronic wave functions in terms of orbital correlation. Orbital entanglement emerged to be a powerful tool to provide a qualitative understanding of bond-forming and bond-breaking processes, and allowed for an estimation of bond orders of simple diatomic molecules beyond the classical bonding models. In this article we demonstrate that the orbital entanglement analysis can be extended to polyatomic molecules to understand chemical bonding.
[ { "created": "Sun, 19 Jan 2014 20:05:34 GMT", "version": "v1" } ]
2017-09-13
[ [ "Mottet", "Matthieu", "" ], [ "Tecmer", "Pawel", "" ], [ "Boguslawski", "Katharina", "" ], [ "Legeza", "Ors", "" ], [ "Reiher", "Markus", "" ] ]
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1401.5444
Ray Maleh
Ray Maleh and Frank A. Boyle
Exploiting Spectral Leakage for Spectrogram Frequency Super-resolution
Presented at the 2013 Asilomar Conference on Signals, Systems & Computers
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The spectrogram is a classical DSP tool used to view signals in both time and frequency. Unfortunately, the Heisenberg Uncertainty Principal limits our ability to use them for detecting and measuring narrowband signal modulation in wideband environments. On a spectrogram, instantaneous frequency can only be measured to the nearest bin without additional interpolation. This work presents a novel technique for extracting higher accuracy frequency estimates. Whereas most practitioners seek to suppress spectral leakage, we use mismatched windows to exploit such artifacts in order to produce super-resolved spectral displays. We present a derivation of our methodology and exhibit several interesting examples.
[ { "created": "Tue, 21 Jan 2014 20:10:30 GMT", "version": "v1" } ]
2014-01-22
[ [ "Maleh", "Ray", "" ], [ "Boyle", "Frank A.", "" ] ]
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1401.5448
Shuang Zhang
Wenlong Gao, Mark Lawrence, Biao Yang, Fu Liu, Fengzhou Fang, Benjamin B\'eri, Jensen Li, Shuang Zhang
Topological Photonic Phase in Chiral Hyperbolic Metamaterials
11 pages, 3 figures. To appear in PRL
null
10.1103/PhysRevLett.114.037402
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Recently the possibility of achieving one-way backscatter immune transportation of light by mimicking the topological order present within certain solid state systems, such as topological insulators, has received much attention. Thus far however, demonstrations of non-trivial topology in photonics have relied on photonic crystals with precisely engineered lattice structures, periodic on the scale of the operational wavelength and composed of finely tuned, complex materials. Here we propose a novel effective medium approach towards achieving topologically protected photonic surface states robust against disorder on all length scales and for a wide range of material parameters. Remarkably, the non-trivial topology of our metamaterial design results from the Berry curvature arising from the transversality of electromagnetic waves in a homogeneous medium. Our investigation therefore acts to bridge the gap between the advancing field of topological band theory and classical optical phenomena such as the Spin Hall effect of light. The effective medium route to topological phases will pave the way for highly compact one-way transportation of electromagnetic waves in integrated photonic circuits.
[ { "created": "Tue, 21 Jan 2014 20:21:13 GMT", "version": "v1" }, { "created": "Fri, 19 Dec 2014 23:20:19 GMT", "version": "v2" } ]
2015-06-18
[ [ "Gao", "Wenlong", "" ], [ "Lawrence", "Mark", "" ], [ "Yang", "Biao", "" ], [ "Liu", "Fu", "" ], [ "Fang", "Fengzhou", "" ], [ "Béri", "Benjamin", "" ], [ "Li", "Jensen", "" ], [ "Zhang", "Shuang", "" ] ]
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1401.5451
Poulomi Sadhukhan
Poulomi Sadhukhan and Somendra M. Bhattacharjee
Thermodynamic relations for DNA phase transitions
9 Pages, 5 figures. To appear in Indian Journal of Physics, Special Issue on the occasion of 125th Birth Anniversary of Sir C V Raman
Indian J Phys (2014) 88: 895-904
10.1007/s12648-014-0489-3
null
cond-mat.soft cond-mat.stat-mech physics.bio-ph q-bio.BM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The force induced unzipping transition of a double stranded DNA is considered from a purely thermodynamic point of view. This analysis provides us with a set of relations that can be used to test microscopic theories and experiments. The thermodynamic approach is based on the hypothesis of impenetrability of the force in the zipped state. The melting and the unzipping transitions are considered in the same framework and compared with the existing statistical model results. The analysis is then extended to a possible continuous unzipping transition.
[ { "created": "Tue, 21 Jan 2014 20:28:41 GMT", "version": "v1" }, { "created": "Tue, 22 Apr 2014 18:19:46 GMT", "version": "v2" } ]
2015-06-18
[ [ "Sadhukhan", "Poulomi", "" ], [ "Bhattacharjee", "Somendra M.", "" ] ]
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1401.5461
Regine Frank
Georg Maret, Tilo Sperling, Wolfgang B\"uhrer, Andreas Lubatsch, Regine Frank, Christof M. Aegerter
Inelastic scattering puts in question recent claims of Anderson localization of light
null
Nature Photonics 7, 934-935 (2013)
10.1038/nphoton.2013.281
null
cond-mat.dis-nn cond-mat.mes-hall cond-mat.mtrl-sci cond-mat.soft physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The interplay between nonlinear effects and Anderson localization in disordered optical fibres1 has recently attracted great interest, and it is important in the action of random lasers in which closed multiple scattering loops have enhanced intensity. As optical nonlinearities in TiO2 can give valuable information on the nature of light transport in strongly scattering powders, we studied these effects in an extended experimental and theoretical investigation (to be published). Now, Scheffold and Wiersma have ...
[ { "created": "Tue, 21 Jan 2014 20:59:53 GMT", "version": "v1" } ]
2015-04-08
[ [ "Maret", "Georg", "" ], [ "Sperling", "Tilo", "" ], [ "Bührer", "Wolfgang", "" ], [ "Lubatsch", "Andreas", "" ], [ "Frank", "Regine", "" ], [ "Aegerter", "Christof M.", "" ] ]
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1401.5465
Wanling Gao
Zijian Ming, Chunjie Luo, Wanling Gao, Rui Han, Qiang Yang, Lei Wang, and Jianfeng Zhan
BDGS: A Scalable Big Data Generator Suite in Big Data Benchmarking
null
null
null
null
cs.DB
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Data generation is a key issue in big data benchmarking that aims to generate application-specific data sets to meet the 4V requirements of big data. Specifically, big data generators need to generate scalable data (Volume) of different types (Variety) under controllable generation rates (Velocity) while keeping the important characteristics of raw data (Veracity). This gives rise to various new challenges about how we design generators efficiently and successfully. To date, most existing techniques can only generate limited types of data and support specific big data systems such as Hadoop. Hence we develop a tool, called Big Data Generator Suite (BDGS), to efficiently generate scalable big data while employing data models derived from real data to preserve data veracity. The effectiveness of BDGS is demonstrated by developing six data generators covering three representative data types (structured, semi-structured and unstructured) and three data sources (text, graph, and table data).
[ { "created": "Wed, 22 Jan 2014 02:17:52 GMT", "version": "v1" }, { "created": "Thu, 20 Feb 2014 08:13:48 GMT", "version": "v2" }, { "created": "Thu, 27 Feb 2014 03:40:26 GMT", "version": "v3" } ]
2014-02-28
[ [ "Ming", "Zijian", "" ], [ "Luo", "Chunjie", "" ], [ "Gao", "Wanling", "" ], [ "Han", "Rui", "" ], [ "Yang", "Qiang", "" ], [ "Wang", "Lei", "" ], [ "Zhan", "Jianfeng", "" ] ]
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1401.5471
Lorenzo Sironi
Lorenzo Sironi (Harvard) and Anatoly Spitkovsky (Princeton)
Relativistic Reconnection: an Efficient Source of Non-Thermal Particles
6 pages, 5 figures, ApJL accepted, movies available at https://www.cfa.harvard.edu/~lsironi/Site/sigma10.no.guide.field/
null
10.1088/2041-8205/783/1/L21
null
astro-ph.HE physics.plasm-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In magnetized astrophysical outflows, the dissipation of field energy into particle energy via magnetic reconnection is often invoked to explain the observed non-thermal signatures. By means of two- and three-dimensional particle-in-cell simulations, we investigate anti-parallel reconnection in magnetically-dominated electron-positron plasmas. Our simulations extend to unprecedentedly long temporal and spatial scales, so we can capture the asymptotic state of the system beyond the initial transients, and without any artificial limitation by the boundary conditions. At late times, the reconnection layer is organized into a chain of large magnetic islands connected by thin X-lines. The plasmoid instability further fragments each X-line into a series of smaller islands, separated by X-points. At the X-points, the particles become unmagnetized and they get accelerated along the reconnection electric field. We provide definitive evidence that the late-time particle spectrum integrated over the whole reconnection region is a power-law, whose slope is harder than -2 for magnetizations sigma>10. Efficient particle acceleration to non-thermal energies is a generic by-product of the long-term evolution of relativistic reconnection in both two and three dimensions. In three dimensions, the drift-kink mode corrugates the reconnection layer at early times, but the long-term evolution is controlled by the plasmoid instability, that facilitates efficient particle acceleration, in analogy to the two-dimensional physics. Our findings have important implications for the generation of hard photon spectra in pulsar winds and relativistic astrophysical jets.
[ { "created": "Tue, 21 Jan 2014 21:00:15 GMT", "version": "v1" } ]
2015-06-18
[ [ "Sironi", "Lorenzo", "", "Harvard" ], [ "Spitkovsky", "Anatoly", "", "Princeton" ] ]
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1401.5481
Igor Iosilevskiy
Igor Iosilevskiy
"Phase freezeout" in isentropically expanding matter
6 pages, 2 figures, 11 refs. Proceedings of Int. Conference "Physics of Extreme State of Matter" (Elbrus-2011), 1-6 February 2011, Russia
"Physics of Extreme State of Matter", Eds. V.Fortov et al., IPCP RAS Publ., Chernogolovka, Russia, 2011, PP. 99-102
null
null
physics.plasm-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Features of isentropic expansion of warm dense matter (WDM) created by intense energy fluxes (strong shock compression or instant isochoric heating by laser or heavy ions) are under discussion in situation when ($i$) -- thermodynamic trajectory of such expansion crosses binodal of liquid-gas phase transition, and ($ii$) -- expansion within the two-phase region is going along equilibrium branch (not metastable one) of the two-phase mixture isentrope. It is known in the plane case that because of break in the expansion isentrope at binodal point (in $P-V$ plane) i.e. jump of sound velocity in this point, there appears extended zone ("boiling layer") of uniformity in expanding material with constant thermodynamic and kinematic parameters. It corresponds just to the state on this binodal of boiling liquid. The point is that because of self-similarity of such expansion (in plane case) this boiling layer contains finite and fixed part of whole expanding material. This property makes it possible (at least formally) to discuss this type of isentropic expansion of WDM as a tool for generation (and diagnostics) of extended uniform state of matter exactly on binodal (and even in critical point) when parameters of this binodal (and/or thermophysical properties on it) are not known. It is natural to use the term "phase freezeout" for this regime of expansion. It is similar to the terms "chemical freezeout" and "kinetic freezeout", which are widely used in interpretation of quark-hardon transformations during expansion of quark-gluon "fireball" in ultra-high energy ionic collisions in supercolliders. General hydrodynamic scheme of adiabatic movements for the case of ensemble of well positioned plates or foils (stack target) under instant isochoric heating (for example, by heavy ion beam) is considered as elaboration of simple idea of phase freeze-out ("reverberation" regime).
[ { "created": "Tue, 21 Jan 2014 21:00:52 GMT", "version": "v1" } ]
2014-01-23
[ [ "Iosilevskiy", "Igor", "" ] ]
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1401.5482
Bradley Hauer
Bradley D Hauer, Paul H Kim, Callum Doolin, Allison JR MacDonald, Hugh Ramp and John P Davis
On-Chip Cavity Optomechanical Coupling
31 pages, 9 figures
EPJ Techniques and Instrumentation 1, 4 (2014)
10.1140/epjti4
null
cond-mat.mes-hall physics.ins-det physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
On-chip cavity optomechanics, in which strong co-localization of light and mechanical motion is engineered, relies on efficient coupling of light both into and out of the on-chip optical resonator. Here we detail our particular style of tapered and dimpled optical fibers, pioneered by the Painter group at Caltech, which are a versatile and reliable solution to efficient on-chip coupling. First, a brief overview of tapered, single mode fibers is presented, in which the single mode cutoff diameter is highlighted. The apparatus used to create a dimpled tapered fiber is then described, followed by a comprehensive account of the procedure by which a dimpled tapered fiber is produced and mounted in our system. The custom-built optical access vacuum chambers in which our on-chip optomechanical measurements are performed are then discussed. Finally, the process by which our optomechanical devices are fabricated and the method by which we explore their optical and mechanical properties is explained. It is our expectation that this manuscript will enable the novice to develop advanced optomechanical experiments.
[ { "created": "Tue, 21 Jan 2014 21:01:14 GMT", "version": "v1" } ]
2014-05-19
[ [ "Hauer", "Bradley D", "" ], [ "Kim", "Paul H", "" ], [ "Doolin", "Callum", "" ], [ "MacDonald", "Allison JR", "" ], [ "Ramp", "Hugh", "" ], [ "Davis", "John P", "" ] ]
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1401.5497
Markus Reiher
Sebastian F. Keller and Markus Reiher
Determining Factors for the Accuracy of DMRG in Chemistry
16 pages, 2 figures, 1 table
Chimia 68 (2014) 200-203
10.2533/chimia.2014.200
null
physics.chem-ph cond-mat.str-el physics.comp-ph quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Density Matrix Renormalization Group (DMRG) algorithm has been a rising star for the accurate ab initio exploration of Born-Oppenheimer potential energy surfaces in theoretical chemistry. However, owing to its iterative numerical nature, pit falls, that can affect the accuracy of DMRG energies, need to be circumvented. Here, after a brief introduction into this quantum chemical method, we discuss criteria that determine the accuracy of DMRG calculations.
[ { "created": "Tue, 21 Jan 2014 21:37:43 GMT", "version": "v1" } ]
2014-05-13
[ [ "Keller", "Sebastian F.", "" ], [ "Reiher", "Markus", "" ] ]
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1401.5503
Spyros Themelis
Spyros I. Themelis
Two-color pump-probe dynamics of transitions between doubly excited states of Helium
10 pages, 5 figures
Balkan Physics Letters, BPL, 12 (3), pp. 158 - 167 (2004) - 1 July 2004
null
null
physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We discuss the dynamics of the two-photon resonant ionization of helium involving two autoionizing states in the presence of two-color laser fields. The first source is tuned around the transition from the ground state to the 2s2p 1Po autoionizing state, and the second couples the state 2s2p 1Po to the 2p2 1S autoionizing state. The laser coupling between the doubly excited states is shown to lead to modifications of the Beutler-Fano profile and the appearance of an Autler-Townes doublet. This double resonance effect between autoionizing states can be observed at moderate laser intensities easily attainable by currently operated sources.
[ { "created": "Tue, 21 Jan 2014 22:04:46 GMT", "version": "v1" }, { "created": "Thu, 23 Jan 2014 19:54:33 GMT", "version": "v2" } ]
2014-01-24
[ [ "Themelis", "Spyros I.", "" ] ]
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1401.5505
J\"org G\"otte
J\"org B. G\"otte, Wolfgang L\"offler, Mark R. Dennis
Eigenpolarizations for Giant Transverse Optical Beam Shifts
5 pages, 3 figures (accepted for publication in Physical Review Letters)
Physical Review Letters 112, 233901 (2014)
10.1103/PhysRevLett.112.233901
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We show how careful control of the incident polarization of a light beam close to the Brewster angle gives a giant transverse spatial shift on reflection. This resolves the long-standing puzzle of why such beam shifts transverse to the incident plane [Imbert-Fedorov (IF) shifts] tend to be an order of magnitude smaller than the related Goos-H\"anchen (GH) shifts in the longitudinal direction, which are largest close to critical incidence. We demonstrate that with the proper initial polarization the transverse displacements can be equally large, which we confirm experimentally near Brewster incidence. In contrast to the established understanding these polarizations are elliptical and angle-dependent. We explain the magnitude of the IF shift by an analogous change of the symmetry properties for the reflection operators as compared to the GH shift.
[ { "created": "Tue, 21 Jan 2014 22:10:41 GMT", "version": "v1" }, { "created": "Sat, 31 May 2014 05:30:19 GMT", "version": "v2" } ]
2014-06-12
[ [ "Götte", "Jörg B.", "" ], [ "Löffler", "Wolfgang", "" ], [ "Dennis", "Mark R.", "" ] ]
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1401.5509
Boulaalam Abdelhak
Abdelhak Boulaalam, El Habib Nfaoui, Omar El Beqqali
Intelligent Product: Mobile Agent Architecture Integrating the End of Life Cycle (EOL) For minimizing the lunch phase PLM
8 pages, 11 figures, The Proceeding of International Conference on Soft Computing and Software Engineering 2013
International Journal of Soft Computing and Software Engineering [JSCSE], Vol. 3, No. 3, pp. 107-114, 2013, Doi: 10.7321/jscse.v3.n3.18
10.7321/jscse.v3.n3.18
null
cs.OH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
To improve the increasingly demands products that are customized, all business activities performed along the product life cycle must be coordinated and efficiently managed along the extended enterprise. For this, enterprise had wanted to retain control over the whole product lifecycle especially when the product is in use/recycling (End Of Life phase). Although there have been many previous research works about product lifecycle management in the beginning of life (BOL) and middle of life (MOL) phases, few addressed the end of life (EOL) phase, in particular, when the product is at the customers. In this paper, based on product embedded device identification (PEID) and mobile agent technologies, and with the advent of the development of the "intelligent products", we will try to improve innovation: (a) by minimize the lunch phase, (b) and the involvement of the customer in product lifecycle.
[ { "created": "Tue, 21 Jan 2014 22:35:36 GMT", "version": "v1" } ]
2014-01-23
[ [ "Boulaalam", "Abdelhak", "" ], [ "Nfaoui", "El Habib", "" ], [ "Beqqali", "Omar El", "" ] ]
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1401.5510
Vladislav A. Yastrebov Dr.
Vladislav A. Yastrebov, Michael Fischlschweiger, Georges Cailletaud, Thomas Antretter
The role of phase interface energy in martensitic transformations: a lattice Monte-Carlo simulation
10 pages, 3 figures, 22 references
Mechanics Research Communications, 56:37-41 (2014)
10.1016/j.mechrescom.2013.11.006
null
cond-mat.mtrl-sci physics.comp-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
To study martensitic phase transformation we use a micromechanical model based on statistical mechanics. Employing lattice Monte-Carlo simulations and realistic material properties for shape-memory alloys (SMA), we investigate the combined influence of the external stress, temperature, and interface energy between the austenitic and martensitic phase on the transformation kinetics and the effective material compliance. The one-dimensional model predicts well many features of the martensitic transformation that are observed experimentally. Particularly, we study the influence of the interface energy on the transformation width and the effective compliance. In perspective, the obtained results might be helpful for the design of new SMAs for more sensitive smart structures and more efficient damping systems.
[ { "created": "Tue, 21 Jan 2014 22:41:28 GMT", "version": "v1" } ]
2014-01-23
[ [ "Yastrebov", "Vladislav A.", "" ], [ "Fischlschweiger", "Michael", "" ], [ "Cailletaud", "Georges", "" ], [ "Antretter", "Thomas", "" ] ]
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1401.5512
Stefan Schneider
Russell Impagliazzo, Shachar Lovett, Ramamohan Paturi, Stefan Schneider
0-1 Integer Linear Programming with a Linear Number of Constraints
null
null
null
null
cs.CC cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We give an exact algorithm for the 0-1 Integer Linear Programming problem with a linear number of constraints that improves over exhaustive search by an exponential factor. Specifically, our algorithm runs in time $2^{(1-\text{poly}(1/c))n}$ where n is the number of variables and cn is the number of constraints. The key idea for the algorithm is a reduction to the Vector Domination problem and a new algorithm for that subproblem.
[ { "created": "Tue, 21 Jan 2014 22:46:18 GMT", "version": "v1" }, { "created": "Tue, 18 Feb 2014 23:27:30 GMT", "version": "v2" } ]
2014-02-20
[ [ "Impagliazzo", "Russell", "" ], [ "Lovett", "Shachar", "" ], [ "Paturi", "Ramamohan", "" ], [ "Schneider", "Stefan", "" ] ]
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1401.5520
Zhisong Qu
Zhisong Qu, Michael Fitzgerald, Matthew John Hole
Analysing the impact of anisotropy pressure on tokamak equilibria
null
Plasma Phys. Control. Fusion 56 (2014) 075007
10.1088/0741-3335/56/7/075007
null
physics.plasm-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Neutral beam injection or ion cyclotron resonance heating induces pressure anisotropy. The axisymmetric plasma equilibrium code HELENA has been upgraded to include anisotropy and toroidal flow. With both analytical and numerical methods, we have studied the determinant factors in anisotropic equilibria and their impact on flux surfaces, magnetic axis shift, the displacement of pressures and density contours from flux surface. With $p_\parallel/p_\perp \approx 1.5$, $p_\perp$ can vary 20% on $s=0.5$ flux surface, in a MAST like equilibrium. We have also re-evaluated the widely applied approximation to anisotropy in which $p^*=(p_\parallel + p_\perp)/2$, the average of parallel and perpendicular pressure, is taken as the approximate isotropic pressure. We find the reconstructions of the same MAST discharge with $p_\parallel/p_\perp \approx 1.25$, using isotropic and anisotropic model respectively, to have a 3% difference in toroidal field but a 66% difference in poloidal current.
[ { "created": "Tue, 21 Jan 2014 23:22:55 GMT", "version": "v1" }, { "created": "Thu, 20 Mar 2014 23:33:02 GMT", "version": "v2" } ]
2015-02-10
[ [ "Qu", "Zhisong", "" ], [ "Fitzgerald", "Michael", "" ], [ "Hole", "Matthew John", "" ] ]
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1401.5522
Bradley Lowery
Mathieu Faverge, Julien Herrmann, Julien Langou, Bradley Lowery, Yves Robert and Jack Dongarra
Designing LU-QR hybrid solvers for performance and stability
15 pages
null
null
null
math.NA cs.NA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper introduces hybrid LU-QR al- gorithms for solving dense linear systems of the form Ax = b. Throughout a matrix factorization, these al- gorithms dynamically alternate LU with local pivoting and QR elimination steps, based upon some robustness criterion. LU elimination steps can be very efficiently parallelized, and are twice as cheap in terms of floating- point operations, as QR steps. However, LU steps are not necessarily stable, while QR steps are always stable. The hybrid algorithms execute a QR step when a robustness criterion detects some risk for instability, and they execute an LU step otherwise. Ideally, the choice between LU and QR steps must have a small computational overhead and must provide a satisfactory level of stability with as few QR steps as possible. In this paper, we introduce several robustness criteria and we establish upper bounds on the growth factor of the norm of the updated matrix incurred by each of these criteria. In addition, we describe the implementation of the hybrid algorithms through an exten- sion of the PaRSEC software to allow for dynamic choices during execution. Finally, we analyze both stability and performance results compared to state-of-the-art linear solvers on parallel distributed multicore platforms.
[ { "created": "Tue, 21 Jan 2014 23:45:16 GMT", "version": "v1" } ]
2014-01-23
[ [ "Faverge", "Mathieu", "" ], [ "Herrmann", "Julien", "" ], [ "Langou", "Julien", "" ], [ "Lowery", "Bradley", "" ], [ "Robert", "Yves", "" ], [ "Dongarra", "Jack", "" ] ]
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1401.5524
Scott Hsu
D. R. Welch, T. C. Genoni, C. Thoma, D. V. Rose, and S. C. Hsu
Particle-in-cell simulations of laser beat-wave magnetization of dense plasmas
18 pages, 10 figures, submitted for publication
Physics of Plasmas 21, 032704 (2014)
10.1063/1.4868225
LA-UR-14-20350
physics.plasm-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The interaction of two lasers with a difference frequency near that of the ambient plasma frequency produces beat waves that can resonantly accelerate thermal electrons. These beat waves can be used to drive electron current and thereby embed magnetic fields into the plasma [D. R. Welch et al., Phys. Rev. Lett. 109, 225002 (2012)]. In this paper, we present two-dimensional particle-in-cell simulations of the beat-wave current-drive process over a wide range of angles between the injected lasers, laser intensities, and plasma densities. We discuss the application of this technique to the magnetization of dense plasmas, motivated in particular by the problem of forming high-beta plasma targets in a standoff manner for magneto-inertial fusion. The feasibility of a near-term experiment embedding magnetic fields using lasers with micron-scale wavelengths into a $\sim 10^{18}$-cm$^{-3}$-density plasma is assessed.
[ { "created": "Wed, 22 Jan 2014 00:09:28 GMT", "version": "v1" } ]
2014-03-13
[ [ "Welch", "D. R.", "" ], [ "Genoni", "T. C.", "" ], [ "Thoma", "C.", "" ], [ "Rose", "D. V.", "" ], [ "Hsu", "S. C.", "" ] ]
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1401.5528
Monowar Hasan
Bharat Shrestha, Ekram Hossain, Kae Won Choi
Distributed and Centralized Hybrid CSMA/CA-TDMA Schemes for Single-Hop Wireless Networks
Submitted to IEEE Transactions on Wireless Communications (TWC)
null
10.1109/TWC.2014.2327102
null
cs.NI cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The strength of carrier-sense multiple access with collision avoidance (CSMA/CA) can be combined with that of time-division multiple access (TDMA) to enhance the channel access performance in wireless networks such as the IEEE 802.15.4-based wireless personal area networks (WPANs). In particular, the performance of legacy CSMA/CA-based medium access control (MAC) scheme in congested networks can be enhanced through a hybrid CSMA/CA-TDMA scheme while preserving the scalability property. In this paper, we present distributed and centralized channel access models which follow the transmission strategies based on Markov decision process (MDP) to access both contention period and contention-free period in an intelligent way. The models consider the buffer status as an indication of congestion provided that the offered traffic does not exceed the channel capacity. We extend the models to consider the hidden node collision problem encountered due to the signal attenuation caused by channel fading. The simulation results show that the MDP-based distributed channel access scheme outperforms the legacy slotted CSMA/CA scheme. This scheme also works efficiently in a network consisting of heterogeneous nodes. The centralized model outperforms the distributed model but requires the global information of the network.
[ { "created": "Wed, 22 Jan 2014 00:48:35 GMT", "version": "v1" } ]
2016-11-18
[ [ "Shrestha", "Bharat", "" ], [ "Hossain", "Ekram", "" ], [ "Choi", "Kae Won", "" ] ]
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1401.5530
Monowar Hasan
E. Hossain, M. Rasti, H. Tabassum, A. Abdelnasser
Evolution Towards 5G Multi-tier Cellular Wireless Networks: An Interference Management Perspective
IEEE Wireless Communications Magazine, to appear
null
10.1109/MWC.2014.6845056
null
cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The evolving fifth generation (5G) cellular wireless networks are envisioned to overcome the fundamental challenges of existing cellular networks, e.g., higher data rates, excellent end-to-end performance and user-coverage in hot-spots and crowded areas with lower latency, energy consumption and cost per information transfer. To address these challenges, 5G systems need to adopt a multi-tier architecture consisting of macrocells, different types of licensed small cells, relays, and device-to-device (D2D) networks to serve users with different quality-of-service (QoS) requirements in a spectrum and energy-efficient manner. Starting with the visions and requirements of 5G multi-tier networks, this article outlines the challenges of interference management (e.g., power control, cell association) in these networks with shared spectrum access (i.e., when the different network tiers shares the same licensed spectrum). It is argued that the existing interference management schemes will not be able to address the interference management problem in prioritized 5G multi-tier networks where users in different tiers have different priorities for channel access. In this context, a survey and qualitative comparison of the potential existing cell association and power control schemes is provided to demonstrate their limitations for interference management in 5G networks. Open challenges are highlighted and guidelines are provided to modify the existing schemes in order to overcome these limitations and make them suitable for the emerging 5G systems.
[ { "created": "Wed, 22 Jan 2014 00:54:19 GMT", "version": "v1" }, { "created": "Mon, 17 Feb 2014 04:59:01 GMT", "version": "v2" } ]
2016-11-17
[ [ "Hossain", "E.", "" ], [ "Rasti", "M.", "" ], [ "Tabassum", "H.", "" ], [ "Abdelnasser", "A.", "" ] ]
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1401.5532
Sergey Varganov
Dmitry A. Fedorov, Andrei Derevianko, Sergey A. Varganov
Accurate potential energy, dipole moment curves, and lifetimes of vibrational states of heteronuclear alkali dimers
null
J. Chem. Phys. 140, 184315 (2014)
10.1063/1.4875038
null
physics.chem-ph physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We calculate the potential energy curves, the permanent dipole moment curves, and the lifetimes of the ground and excited vibrational states of the heteronuclear alkali dimers XY (X, Y = Li, Na, K, Rb, Cs) in the X1{\Sigma}+ electronic state using the coupled cluster with singles doubles and triples (CCSDT) method. All-electron quadruple-{\zeta} basis sets with additional core functions are used for Li and Na, and small-core relativistic effective core potentials with quadruple-{\zeta} quality basis sets are used for K, Rb and Cs. The inclusion of the coupled cluster non-perturbative triple excitations is shown to be crucial for obtaining the accurate potential energy curves. Large one-electron basis set with additional core functions is needed for the accurate prediction of permanent dipole moments. The dissociation energies are overestimated by only 14 cm-1 for LiNa and by no more than 114 cm-1 for the other molecules. The discrepancies between the experimental and calculated harmonic vibrational frequencies are less than 1.7 cm-1, and the discrepancies for the anharmonic correction are less than 0.1 cm-1. We show that correlation between atomic electronegativity differences and permanent dipole moment of heteronuclear alkali dimers is not perfect. To obtain the vibrational energies and wave functions the vibrational Schr\"odinger equation is solved with the B-spline basis set method. The transition dipole moments between all vibrational states, the Einstein coefficients and the lifetimes of the vibrational states are calculated. We analyze the decay rates of the vibrational states in terms of spontaneous emission, and stimulated emission and absorption induced by black body radiation. In all studied heteronuclear alkali dimers the ground vibrational states have much longer lifetimes than any excited states.
[ { "created": "Wed, 22 Jan 2014 01:09:23 GMT", "version": "v1" } ]
2016-10-05
[ [ "Fedorov", "Dmitry A.", "" ], [ "Derevianko", "Andrei", "" ], [ "Varganov", "Sergey A.", "" ] ]
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1401.5534
Jihad Touma
Jihad Touma and Scott Tremaine
The statistical mechanics of self-gravitating Keplerian disks
J. Phys. A (Fast Track Communication), published (minor changes from v1), 32 pages, 4 figures
J. Phys. A: Math. Theor. 47 (2014) 292001
null
null
astro-ph.GA cond-mat.stat-mech physics.plasm-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We describe the dynamics and thermodynamics of collisionless particle disks orbiting a massive central body, in the case where the disk mass is small compared to the central mass, the self-gravity of the disk dominates the non-Keplerian force, and the spread in semi-major axes is small. We show that with plausible approximations such disks have logarithmic two-body interactions and a compact phase space, and therefore exhibit thermodynamics that are simpler than most other gravitating systems, which require a confining box and artificial softening of the potential at small scales to be thermodynamically well-behaved. We solve for the microcanonical axisymmetric thermal equilibria and demonstrate the existence of a symmetry-breaking bifurcation into lopsided equilibria. We discuss the relation between thermal and dynamical instability in these systems and draw connections to astrophysical settings, as well as to the wider subject of the statistical mechanics of particles with logarithmic long-range interactions, such as point vortices in two-dimensional fluids.
[ { "created": "Wed, 22 Jan 2014 01:35:10 GMT", "version": "v1" }, { "created": "Thu, 11 Sep 2014 19:06:18 GMT", "version": "v2" } ]
2014-09-12
[ [ "Touma", "Jihad", "" ], [ "Tremaine", "Scott", "" ] ]
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1401.5535
Shu Kong
Shu Kong, Zhuolin Jiang, Qiang Yang
Learning Mid-Level Features and Modeling Neuron Selectivity for Image Classification
19 pages, 14 figures
null
null
null
cs.CV cs.LG cs.NE cs.RO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We now know that mid-level features can greatly enhance the performance of image learning, but how to automatically learn the image features efficiently and in an unsupervised manner is still an open question. In this paper, we present a very efficient mid-level feature learning approach (MidFea), which only involves simple operations such as $k$-means clustering, convolution, pooling, vector quantization and random projection. We explain why this simple method generates the desired features, and argue that there is no need to spend much time in learning low-level feature extractors. Furthermore, to boost the performance, we propose to model the neuron selectivity (NS) principle by building an additional layer over the mid-level features before feeding the features into the classifier. We show that the NS-layer learns category-specific neurons with both bottom-up inference and top-down analysis, and thus supports fast inference for a query image. We run extensive experiments on several public databases to demonstrate that our approach can achieve state-of-the-art performances for face recognition, gender classification, age estimation and object categorization. In particular, we demonstrate that our approach is more than an order of magnitude faster than some recently proposed sparse coding based methods.
[ { "created": "Wed, 22 Jan 2014 01:35:59 GMT", "version": "v1" }, { "created": "Thu, 23 Jan 2014 09:19:10 GMT", "version": "v2" } ]
2014-01-24
[ [ "Kong", "Shu", "" ], [ "Jiang", "Zhuolin", "" ], [ "Yang", "Qiang", "" ] ]
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1401.5536
Alex Dytso
Alex Dytso, Daniela Tuninetti, Natasha Devroye
On Discrete Alphabets for the Two-user Gaussian Interference Channel with One Receiver Lacking Knowledge of the Interfering Codebook
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null
null
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cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In multi-user information theory it is often assumed that every node in the network possesses all codebooks used in the network. This assumption is however impractical in distributed ad-hoc and cognitive networks. This work considers the two- user Gaussian Interference Channel with one Oblivious Receiver (G-IC-OR), i.e., one receiver lacks knowledge of the interfering cookbook while the other receiver knows both codebooks. We ask whether, and if so how much, the channel capacity of the G-IC- OR is reduced compared to that of the classical G-IC where both receivers know all codebooks. Intuitively, the oblivious receiver should not be able to jointly decode its intended message along with the unintended interfering message whose codebook is unavailable. We demonstrate that in strong and very strong interference, where joint decoding is capacity achieving for the classical G-IC, lack of codebook knowledge does not reduce performance in terms of generalized degrees of freedom (gDoF). Moreover, we show that the sum-capacity of the symmetric G-IC- OR is to within O(log(log(SNR))) of that of the classical G-IC. The key novelty of the proposed achievable scheme is the use of a discrete input alphabet for the non-oblivious transmitter, whose cardinality is appropriately chosen as a function of SNR.
[ { "created": "Wed, 22 Jan 2014 01:41:32 GMT", "version": "v1" } ]
2014-01-23
[ [ "Dytso", "Alex", "" ], [ "Tuninetti", "Daniela", "" ], [ "Devroye", "Natasha", "" ] ]
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1401.5541
Theodore Drivas D
Gregory L. Eyink, Theodore D. Drivas
Spontaneous Stochasticity and Anomalous Dissipation for Burgers Equation
minor revisions, paper will appear in JSP
Journal of Statistical Physics 158 (2), 386-432, 2015
10.1007/s10955-014-1135-33
null
math-ph math.AP math.MP physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We develop a Lagrangian approach to conservation-law anomalies in weak solutions of inviscid Burgers equation, motivated by previous work on the Kraichnan model of turbulent scalar advection. We show that the entropy solutions of Burgers possess Markov stochastic processes of (generalized) Lagrangian trajectories backward in time for which the Burgers velocity is a backward martingale. This property is shown to guarantee dissipativity of conservation-law anomalies for general convex functions of the velocity. The backward stochastic Burgers flows with these properties are not unique, however. We construct infinitely many such stochastic flows, both by a geometric construction and by the zero-noise limit of the Constantin-Iyer stochastic representation of viscous Burgers solutions. The latter proof yields the spontaneous stochasticity of Lagrangian trajectories backward in time for Burgers, at unit Prandtl number. It is conjectured that existence of a backward stochastic flow with the velocity as martingale is an admissibility condition which selects the unique entropy solution for Burgers. We also study linear transport of passive densities and scalars by inviscid Burgers flows. We show that shock solutions of Burgers exhibit spontaneous stochasticity backward in time for all Prandtl numbers, implying conservation-law anomalies for linear transport. We discuss the relation of our results for Burgers with incompressible Navier-Stokes turbulence, especially Lagrangian admissibility conditions for Euler solutions and the relation between turbulent cascade directions and time-asymmetry of Lagrangian stochasticity.
[ { "created": "Wed, 22 Jan 2014 02:13:44 GMT", "version": "v1" }, { "created": "Thu, 24 Apr 2014 14:19:28 GMT", "version": "v2" } ]
2017-10-06
[ [ "Eyink", "Gregory L.", "" ], [ "Drivas", "Theodore D.", "" ] ]
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1401.5543
Jun Yang
Jun Yang and Fady Alajaji and Glen Takahara
Lower Bounds on the Probability of a Finite Union of Events
SIAM Journal on Discrete Mathematics, 2016
null
null
null
math.PR cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, lower bounds on the probability of a finite union of events are considered, i.e. $P\left(\bigcup_{i=1}^N A_i\right)$, in terms of the individual event probabilities $\{P(A_i), i=1,\ldots,N\}$ and the sums of the pairwise event probabilities, i.e., $\{\sum_{j:j\neq i} P(A_i\cap A_j), i=1,\ldots,N\}$. The contribution of this paper includes the following: (i) in the class of all lower bounds that are established in terms of only the $P(A_i)$'s and $\sum_{j:j\neq i} P(A_i\cap A_j)$'s, the optimal lower bound is given numerically by solving a linear programming (LP) problem with $N^2-N+1$ variables; (ii) a new analytical lower bound is proposed based on a relaxed LP problem, which is at least as good as the bound due to Kuai, et al.; (iii) numerical examples are provided to illustrate the performance of the bounds.
[ { "created": "Wed, 22 Jan 2014 02:47:08 GMT", "version": "v1" }, { "created": "Thu, 23 Jan 2014 15:58:24 GMT", "version": "v2" }, { "created": "Tue, 18 Mar 2014 18:14:45 GMT", "version": "v3" }, { "created": "Thu, 19 Jun 2014 03:07:10 GMT", "version": "v4" }, { "created": "Fri, 1 Feb 2019 23:24:32 GMT", "version": "v5" } ]
2019-02-05
[ [ "Yang", "Jun", "" ], [ "Alajaji", "Fady", "" ], [ "Takahara", "Glen", "" ] ]
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1401.5546
Christopher Stewart
Chen Li
GreenMail: Reducing Email Service's Carbon Emission with Minimum Cost
Master's Thesis
null
null
null
cs.OH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Internet services contribute a large fraction of worldwide carbon emission nowadays, in a context of increasing number of companies tending to provide and more and more developers use Internet services. Noticeably, a trend is those service providers are trying to reduce their carbon emissions by utilizing on-site or off-site renewable energy in their datacenters in order to attract more customers. With such efforts have been paid, there are still some users who are aggressively calling for even cleaner Internet services. For example, over 500,000 Facebook users petitioned the social networking site to use renewable energy to power its datacenter. However, it seems impossible for such demand to be satisfied merely from the inside of those production datacenters, considering the transition cost and stability. Outside the existing Internet services, on the other hand, may easily set up a proxy service to attract those renewable-energy-sensitive users, by 1) using carbon neutral or even over-offsetting cloud instances to bridge the end user and traditional Internet services; and 2) estimating and offsetting the carbon emissions from the traditional Internet services. In our paper, we proposed GreenMail, which is a general IMAP proxy caching system that connects email users and traditional email services. GreenMail runs on green web hosts to cache users' emails on green cloud instances. Besides, it offsets the carbon emitted by traditional backend email services. With GreenMail, users could set a carbon emission constraint and use traditional email service without breaking any code modification of user side and email server side.
[ { "created": "Wed, 22 Jan 2014 03:24:12 GMT", "version": "v1" } ]
2014-01-23
[ [ "Li", "Chen", "" ] ]
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1401.5551
Hajir Roozbehani
Hajir Roozbehani and Yury Polyanskiy
Algebraic Methods of Classifying Directed Graphical Models
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null
null
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cs.IT math.IT math.ST stat.TH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Directed acyclic graphical models (DAGs) are often used to describe common structural properties in a family of probability distributions. This paper addresses the question of classifying DAGs up to an isomorphism. By considering Gaussian densities, the question reduces to verifying equality of certain algebraic varieties. A question of computing equations for these varieties has been previously raised in the literature. Here it is shown that the most natural method adds spurious components with singular principal minors, proving a conjecture of Sullivant. This characterization is used to establish an algebraic criterion for isomorphism, and to provide a randomized algorithm for checking that criterion. Results are applied to produce a list of the isomorphism classes of tree models on 4,5, and 6 nodes. Finally, some evidence is provided to show that projectivized DAG varieties contain useful information in the sense that their relative embedding is closely related to efficient inference.
[ { "created": "Wed, 22 Jan 2014 04:45:01 GMT", "version": "v1" }, { "created": "Tue, 23 Dec 2014 03:35:58 GMT", "version": "v2" } ]
2014-12-24
[ [ "Roozbehani", "Hajir", "" ], [ "Polyanskiy", "Yury", "" ] ]
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1401.5553
Dmitry Zinoviev
Dmitry Zinoviev
Peer Ratings in Massive Online Social Networks
9 pages, 1 table, 6 figures. Presented at INSNA SunBelt, March 2012
null
null
null
cs.SI physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Instant quality feedback in the form of online peer ratings is a prominent feature of modern massive online social networks (MOSNs). It allows network members to indicate their appreciation of a post, comment, photograph, etc. Some MOSNs support both positive and negative (signed) ratings. In this study, we rated 11 thousand MOSN member profiles and collected user responses to the ratings. MOSN users are very sensitive to peer ratings: 33% of the subjects visited the researcher's profile in response to rating, 21% also rated the researcher's profile picture, and 5% left a text comment. The grades left by the subjects are highly polarized: out of the six available grades, the most negative and the most positive are also the most popular. The grades fall into three almost equally sized categories: reciprocal, generous, and stingy. We proposed quantitative measures for generosity, reciprocity, and benevolence, and analyzed them with respect to the subjects' demographics.
[ { "created": "Wed, 22 Jan 2014 04:57:01 GMT", "version": "v1" } ]
2014-01-23
[ [ "Zinoviev", "Dmitry", "" ] ]
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1401.5555
Monowar Hasan
Hina Tabassum, Zaher Dawy, Ekram Hossain, Mohamed-Slim Alouini
Interference Statistics and Capacity Analysis for Uplink Transmission in Two-Tier Small Cell Networks: A Geometric Probability Approach
We have withdrawn the paper due to some limitations
null
null
null
cs.IT cs.NI math.IT math.ST stat.TH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Small cell networks are evolving as an economically viable solution to ameliorate the capacity and coverage of state-of-the-art wireless cellular systems. Nonetheless, the dense and unplanned deployment of the small cells (e.g., femtocells, picocells) with restricted user access significantly increases the impact of interference on the overall network performance. To this end, this paper presents a novel framework to derive the statistics of the interference considering dedicated and shared spectrum access for uplink transmissions in two-tier small cell networks such as the macrocell-femtocell networks. The derived expressions are validated by the Monte-Carlo simulations. Numerical results are generated to assess the feasibility of shared and dedicated spectrum access in femtocells under varying traffic load and spectral reuse scenarios.
[ { "created": "Wed, 22 Jan 2014 05:18:23 GMT", "version": "v1" }, { "created": "Thu, 30 Jan 2014 20:58:39 GMT", "version": "v2" } ]
2014-01-31
[ [ "Tabassum", "Hina", "" ], [ "Dawy", "Zaher", "" ], [ "Hossain", "Ekram", "" ], [ "Alouini", "Mohamed-Slim", "" ] ]
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1401.5559
Norazira A Jalil
Nuzulha Khilwani Ibrahim, Emaliana Kasmuri, Norazira A Jalil, Mohd Adili Norasikin, Sazilah Salam, Mohamad Riduwan Md Nawawi
License Plate Recognition (LPR): A Review with Experiments for Malaysia Case Study
null
null
10.7321/jscse.v3.n3.15
null
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Most vehicle license plate recognition use neural network techniques to enhance its computing capability. The image of the vehicle license plate is captured and processed to produce a textual output for further processing. This paper reviews image processing and neural network techniques applied at different stages which are preprocessing, filtering, feature extraction, segmentation and recognition in such way to remove the noise of the image, to enhance the image quality and to expedite the computing process by converting the characters in the image into respective text. An exemplar experiment has been done in MATLAB to show the basic process of the image processing especially for license plate in Malaysia case study. An algorithm is adapted into the solution for parking management system. The solution then is implemented as proof of concept to the algorithm.
[ { "created": "Wed, 22 Jan 2014 05:39:41 GMT", "version": "v1" } ]
2014-01-23
[ [ "Ibrahim", "Nuzulha Khilwani", "" ], [ "Kasmuri", "Emaliana", "" ], [ "Jalil", "Norazira A", "" ], [ "Norasikin", "Mohd Adili", "" ], [ "Salam", "Sazilah", "" ], [ "Nawawi", "Mohamad Riduwan Md", "" ] ]
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1401.5561
Umamaheswari Ganesh
C.P.Sumathi (1), T.Santanam (2) and G.Umamaheswari (1) ((1) Department of Computer Science, SDNB Vaishnav College For Women, Chennai, India. (2) Department of Computer Science, DG Vaishnav College For Men, Chennai, India)
A Study of Various Steganographic Techniques Used for Information Hiding
17 Pages, International Journal of Computer Science & Engineering Survey (IJCSES) Vol.4, No.6, December 2013
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cs.MM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Steganography derives from the Greek word steganos, meaning covered or secret, and graphy (writing or drawing). Steganography is a technology where modern data compression, information theory, spread spectrum, and cryptography technologies are brought together to satisfy the need for privacy on the Internet. This paper is an attempt to analyse the various techniques used in steganography and to identify areas in which this technique can be applied, so that the human race can be benefited at large.
[ { "created": "Wed, 22 Jan 2014 05:58:55 GMT", "version": "v1" } ]
2014-01-23
[ [ "Sumathi", "C. P.", "" ], [ "Santanam", "T.", "" ], [ "Umamaheswari", "G.", "" ] ]
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1401.5566
Yuichiro Yano Mr
Yuichiro Yano and Shigeyoshi Goka
High-contrast Coherent Population Trapping based on Crossed Polarizers Method
8 pages, 15 figures
IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, vol. 61, no. 12 (2014)
10.1109/TUFFC.2014.006623
null
physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We developed a method based on crossed polarizers to observe high-contrast coherent population trapping (CPT) resonance. Since crossed polarizers have a simple optical system, our method is suitable for chip-scale atomic clocks (CSACs). We calculated the Faraday rotation in CPT in a linearly polarized light field (lin || lin) using two pairs of lambda system models based on the density matrix and estimated the spectrum of the Faraday rotation. After that, we measured the contrast and linewidth with the crossed polarizers method. A comparison of the theoretical model and experiment data showed they were in good agreement. Moreover, the experimental results showed that a high contrast (88.4 %) and narrow linewidth (1.15 kHz) resonance could be observed using a Cs gas cell and D1-line vertical-cavity surfaceemitting laser (VCSEL).
[ { "created": "Wed, 22 Jan 2014 06:31:42 GMT", "version": "v1" }, { "created": "Sun, 14 Dec 2014 06:28:12 GMT", "version": "v2" } ]
2014-12-16
[ [ "Yano", "Yuichiro", "" ], [ "Goka", "Shigeyoshi", "" ] ]
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1401.5567
Lin Tie
Lin Tie
On Controllability and Near-controllability of Multi-input Discrete-time Bilinear Systems in Dimension Two
14 pages
null
null
null
cs.SY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper completely solves the controllability problems of two-dimensional multi-input discrete-time bilinear systems with and without drift. Necessary and sufficient conditions for controllability, which cover the existing results, are obtained by using an algebraic method. Furthermore, for the uncontrollable systems, near-controllability is studied and necessary and sufficient conditions for the systems to be nearly controllable are also presented. Examples are provided to demonstrate the conceptions and results of the paper.
[ { "created": "Wed, 22 Jan 2014 06:36:28 GMT", "version": "v1" } ]
2014-01-23
[ [ "Tie", "Lin", "" ] ]
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1401.5577
Patrick LaVictoire
Mihaly Barasz, Paul Christiano, Benja Fallenstein, Marcello Herreshoff, Patrick LaVictoire, Eliezer Yudkowsky
Robust Cooperation in the Prisoner's Dilemma: Program Equilibrium via Provability Logic
18 pages. Updated 2021 to indicate that bounded analogues of these results have yet to be proved
null
null
null
cs.GT cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider the one-shot Prisoner's Dilemma between algorithms with read-access to one anothers' source codes, and we use the modal logic of provability to build agents that can achieve mutual cooperation in a manner that is robust, in that cooperation does not require exact equality of the agents' source code, and unexploitable, meaning that such an agent never cooperates when its opponent defects. We construct a general framework for such "modal agents", and study their properties.
[ { "created": "Wed, 22 Jan 2014 07:39:52 GMT", "version": "v1" }, { "created": "Mon, 5 Apr 2021 01:26:49 GMT", "version": "v2" } ]
2021-04-06
[ [ "Barasz", "Mihaly", "" ], [ "Christiano", "Paul", "" ], [ "Fallenstein", "Benja", "" ], [ "Herreshoff", "Marcello", "" ], [ "LaVictoire", "Patrick", "" ], [ "Yudkowsky", "Eliezer", "" ] ]
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1401.5580
Pradip Sircar
Jugalkishore K. Banoth, Pradip Sircar
Polynomial Transformation Method for Non-Gaussian Noise Environment
4 pages
WORLDCOMP 2011, Proc. CSC, pp. 329, Jul 18-21, 2011, Las Vegas, Nevada, USA
null
null
math.ST cs.CE stat.TH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Signal processing in non-Gaussian noise environment is addressed in this paper. For many real-life situations, the additive noise process present in the system is found to be dominantly non-Gaussian. The problem of detection and estimation of signals corrupted with non-Gaussian noise is difficult to track mathematically. In this paper, we present a novel approach for optimal detection and estimation of signals in non-Gaussian noise. It is demonstrated that preprocessing of data by the orthogonal polynomial approximation together with the minimum error-variance criterion converts an additive non-Gaussian noise process into an approximation-error process which is close to Gaussian. The Monte Carlo simulations are presented to test the Gaussian hypothesis based on the bicoherence of a sequence. The histogram test and the kurtosis test are carried out to verify the Gaussian hypothesis.
[ { "created": "Wed, 22 Jan 2014 07:45:29 GMT", "version": "v1" } ]
2014-01-23
[ [ "Banoth", "Jugalkishore K.", "" ], [ "Sircar", "Pradip", "" ] ]
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1401.5581
Ming Tang
Ai-Xiang Cui, Wei Wang, Ming Tang, Yan Fu, Xiaoming Liang, and Younghae Do
Efficient allocation of heterogeneous response times in information spreading process
8 pages, 6 figures
null
10.1063/1.4890612
null
physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Recently, the impacts of spatiotemporal heterogeneities of human activities on spreading dynamics have attracted extensive attention. In this paper, to study heterogeneous response times on information spreading, we focus on the susceptible-infected spreading dynamics with adjustable power-law response time distribution based on uncorrelated scale-free networks. We find that the stronger the heterogeneity of response times is, the faster the information spreading is in the early and middle stages. Following a given heterogeneity, the procedure of reducing the correlation between the response times and degrees of individuals can also accelerate the spreading dynamics in the early and middle stages. However, the dynamics in the late stage is slightly more complicated, and there is an optimal value of the full prevalence time changing with the heterogeneity of response times and the response time-degree correlation, respectively. The optimal phenomena results from the efficient allocation of heterogeneous response times.
[ { "created": "Wed, 22 Jan 2014 07:48:15 GMT", "version": "v1" } ]
2015-06-18
[ [ "Cui", "Ai-Xiang", "" ], [ "Wang", "Wei", "" ], [ "Tang", "Ming", "" ], [ "Fu", "Yan", "" ], [ "Liang", "Xiaoming", "" ], [ "Do", "Younghae", "" ] ]
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1401.5582
Chenwei Wang
Chenwei Wang
Beyond One-Way Communication: Degrees of Freedom of Multi-Way Relay MIMO Interference Networks
26 pages, 3 figures
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We characterize the degrees of freedom (DoF) of multi-way relay MIMO interference networks. In particular, we consider a wireless network consisting of 4 user nodes, each with M antennas, and one N-antenna relay node. In this network, each user node sends one independent message to each of the other user nodes, and there are no direct links between any two user nodes, i.e., all communication must pass through the relay node. For this network, we show that the symmetric DoF value per message is given by max(min(M/3,N/7),min(2M/7,N/6)) normalized by space dimensions, i.e., piecewise linear depending on M and N alternatively. While the information theoretic DoF upper bound is established for every M and N, the achievability relying on linear signal subspace alignment is established in the spatially-normalized sense in general. In addition, by deactivating 4 messages to form a two-way relay MIMO X channel, we also present the DoF result in the similar piecewise linear type. The central new insight to emerge from this work is the notion of inter-user signal subspace alignment incorporating the idea of network coding, which is the key to achieve the optimal DoF for multi-way relay interference networks. Moreover, this work also settles the feasibility of linear interference alignment that extends the feasibility framework from one-way to multi-way relay interference networks.
[ { "created": "Wed, 22 Jan 2014 07:51:10 GMT", "version": "v1" } ]
2014-01-23
[ [ "Wang", "Chenwei", "" ] ]
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1401.5583
Brian Brubach
Brian Brubach
Improved Online Square-into-Square Packing
15 pages, 3 figures
null
null
null
cs.CG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we show an improved bound and new algorithm for the online square-into-square packing problem. This two-dimensional packing problem involves packing an online sequence of squares into a unit square container without any two squares overlapping. The goal is to find the largest area $\alpha$ such that any set of squares with total area $\alpha$ can be packed. We show an algorithm that can pack any set of squares with total area $\alpha \leq 3/8$ into a unit square in an online setting, improving the previous bound of $11/32$.
[ { "created": "Wed, 22 Jan 2014 07:52:52 GMT", "version": "v1" } ]
2014-01-23
[ [ "Brubach", "Brian", "" ] ]
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1401.5585
Elio Antonello
E. Antonello
Water-filled telescopes
7 pages; to appear in the proceedings of the Conference for the tercentenary of the birth R.G. Boscovich, Pavia, Italy, Sept. 2011
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null
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physics.hist-ph astro-ph.SR physics.pop-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this short note we discuss the case of the thought experiments on water-filled telescopes and their realizations during 18th and 19th century. The story of those instruments shows that the scientific progress occurs in a curious way, since there was no stringent reason for the construction of a water-filled telescope.
[ { "created": "Wed, 22 Jan 2014 08:40:47 GMT", "version": "v1" } ]
2014-01-23
[ [ "Antonello", "E.", "" ] ]
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1401.5589
Stephen Odaibo
Stephen G. Odaibo
The Gabor-Einstein Wavelet: A Model for the Receptive Fields of V1 to MT Neurons
40 pages, 13 Figures. We presented a portion of this work in various parts at the National Medical Association's 111th Annual Convention and Scientific Assembly in Toronto Ontario, Canada (Jul. 2013); at the 23rd Annual Washington Retina Symposium in Washington D.C., U.S.A. (Oct. 2013); and at the Society for Neuroscience's 43rd Annual Meeting in San Diego California, U.S.A. (Nov. 2013)
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q-bio.NC cs.CV physics.bio-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Our visual system is astonishingly efficient at detecting moving objects. This process is mediated by the neurons which connect the primary visual cortex (V1) to the middle temporal (MT) area. Interestingly, since Kuffler's pioneering experiments on retinal ganglion cells, mathematical models have been vital for advancing our understanding of the receptive fields of visual neurons. However, existing models were not designed to describe the most salient attributes of the highly specialized neurons in the V1 to MT motion processing stream; and they have not been able to do so. Here, we introduce the Gabor-Einstein wavelet, a new family of functions for representing the receptive fields of V1 to MT neurons. We show that the way space and time are mixed in the visual cortex is analogous to the way they are mixed in the special theory of relativity (STR). Hence we constrained the Gabor-Einstein model by requiring: (i) relativistic-invariance of the wave carrier, and (ii) the minimum possible number of parameters. From these two constraints, the sinc function emerged as a natural descriptor of the wave carrier. The particular distribution of lowpass to bandpass temporal frequency filtering properties of V1 to MT neurons (Foster et al 1985; DeAngelis et al 1993b; Hawken et al 1996) is clearly explained by the Gabor-Einstein basis. Furthermore, it does so in a manner innately representative of the motion-processing stream's neuronal hierarchy. Our analysis and computer simulations show that the distribution of temporal frequency filtering properties along the motion processing stream is a direct effect of the way the brain jointly encodes space and time. We uncovered this fundamental link by demonstrating that analogous mathematical structures underlie STR and joint cortical spacetime encoding. This link will provide new physiological insights into how the brain represents visual information.
[ { "created": "Wed, 22 Jan 2014 08:48:53 GMT", "version": "v1" } ]
2014-01-23
[ [ "Odaibo", "Stephen G.", "" ] ]
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1401.5592
Jonas Fransson
Jonas Fransson and Jie Ren and Jian-Xin Zhu
Electrical and Thermal Control of Magnetic Exchange Interactions
five pages, four figures, submitted; published version
Phys. Rev. Lett. 113, 257201 (2014)
10.1103/PhysRevLett.113.257201
null
cond-mat.mes-hall cond-mat.stat-mech physics.atm-clus
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We investigate the far-from-equilibrium nature of magnetic anisotropy and exchange interactions between molecular magnets embedded in a tunnel junction. By mapping to an effective spin model, these magnetic interactions can be divided into three types: isotropic Heisenberg, anisotropic Ising, and anisotropic Dzyaloshinski-Moriya contributions, which are attributed to the background non-equilibrium electronic structures. We further demonstrate that both the magnetic self and exchange interactions can be controlled either electrically by gating and tuning voltage bias, or thermally by adjusting temperature bias. We show that the Heisenberg and Ising interactions scale linearly, while the Dzyaloshinski-Moriya interaction scales quadratically, with the molecule-lead coupling strength. The interactions scale linearly with the effective spin-polarizations of the leads and the molecular coherence. Our results pave a way for smart control of magnetic exchange interactions at atomic and molecular levels.
[ { "created": "Wed, 22 Jan 2014 09:01:04 GMT", "version": "v1" }, { "created": "Wed, 7 Jan 2015 07:27:18 GMT", "version": "v2" } ]
2015-01-08
[ [ "Fransson", "Jonas", "" ], [ "Ren", "Jie", "" ], [ "Zhu", "Jian-Xin", "" ] ]
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1401.5599
Siarhei Charapitsa V.
Siarhei Charapitsa, Nikita Kulevich, Svetlana Sytova, Yurii Yakuba
Correct quantitative determination of ethanol and volatile compounds in alcohol products
4 pages, 2 figures, submitted to Proc. of the Wine Active Compounds (WAC) 2014 international conference (Beaune, France, March 26-28, 2014)
null
null
null
physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Determination of the volume content of ethanol in the alcohol products in practice is usually determined by pycnometry, electronic densimetry, or densimetry using a hydrostatic balance in accordance with Commission Regulation No 2870/2000. However, these methods determine directly only density of the tested liquid sample and does not take into account the effects of other volatile components such as aldehydes, esters and higher alcohols. So they are appropriate only for binary water-ethanol solutions in accordance with international table adopted by the International Legal Metrology Organization in its Recommendation No 22. Availability notable concentrations of the higher alcohols and ethers in different alcohol-based products, e. g. in whisky, cognac, brandy, wine as well as in waste alcohol and alcohol beverage production, leads to the significant contribution of these compounds in the value of the density of tested alcohol-containing sample. As a result, determination of the volume of ethanol content for such alcohol products in gives the value of the strength, which may significantly differ from the true one. Using incorrectly calculated volume content of ethyl alcohol leads to incorrect results determining the quantities of volatile compounds in the alcohol-containing products, expressed in milligrams per liter of absolute alcohol. We propose experimental results of the method of correct determination of ethanol and other volatile compounds content in waste products of alcohol and alcoholic beverage industry by gas chromatography. Calculations are based on the measured value of sample density and volatile compound concentrations expressed in mg per liter of absolute alcohol [JAFC 61(2013)2950]. The method can be easily incorporated into daily practice of analytical and control laboratories with no additional material, financial or time costs.
[ { "created": "Wed, 22 Jan 2014 09:49:11 GMT", "version": "v1" } ]
2014-01-23
[ [ "Charapitsa", "Siarhei", "" ], [ "Kulevich", "Nikita", "" ], [ "Sytova", "Svetlana", "" ], [ "Yakuba", "Yurii", "" ] ]
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1401.5602
Laurent Najman
Fabio Dias (LIGM), Jean Cousty (LIGM), Laurent Najman (LIGM)
Dimensional operators for mathematical morphology on simplicial complexes
Pattern Recognition Letters (2014) To appear
null
null
null
cs.DM math.AT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this work we study the framework of mathematical morphology on simplicial complex spaces. Simplicial complexes are widely used to represent multidimensional data, such as meshes, that are two dimensional complexes, or graphs, that can be interpreted as one dimensional complexes. Mathematical morphology is one of the most powerful frameworks for image processing, including the processing of digital structures, and is heavily used for many applications. However, mathematical morphology operators on simplicial complex spaces is not a concept fully developed in the literature. Specifically, we explore properties of the dimensional operators, small, versatile operators that can be used to define new operators on simplicial complexes, while maintaining properties from mathematical morphology. These operators can also be used to recover many morphological operators from the literature. Matlab code and additional material, including the proofs of the original properties, are freely available at \url{https://code.google.com/p/math-morpho-simplicial-complexes.}
[ { "created": "Wed, 22 Jan 2014 09:56:25 GMT", "version": "v1" } ]
2014-01-23
[ [ "Dias", "Fabio", "", "LIGM" ], [ "Cousty", "Jean", "", "LIGM" ], [ "Najman", "Laurent", "", "LIGM" ] ]
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1401.5603
Ming-Hui Lu
Cheng He, Xiao-Chen Sun, Xiao-ping Liu, Zi-Wen Liu, Yulin Chen, Ming-Hui Lu, Yan-Feng Chen
Optical Analogue of Quantum Spin Hall Effect in a Two-Dimensional Gyrotropic Photonic Crystal
20 pages, 5 figures
null
null
null
physics.optics cond-mat.mes-hall
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose an optical counterpart of the quantum spin Hall (QSH) effect in a two-dimensional photonic crystal composed of a gyrotropic medium exhibiting both gyroelectric and gyromagnetic properties simultaneously. Such QSH effect shows unidirectional polarization-dependent transportation of photonic topological edged states, which is robust against certain disorders and impurities. More importantly, we find that such unique property is not protected by conventional time-reversal symmetry of photons obeying the Bosonic statistics but rather by the same symmetry, as electron's time-reversal symmetry. Based on the tight-binding approximation approach, we construct an effective Hamiltonian for this photonic structure, which is shown to have a similar form to that of an electronic QSH system. Furthermore, the invariant of such model is calculated in order to unify its topological non-trivial character. Our finding provides a viable way to exploit the optical topological property, and also can be leveraged to develop a photonic platform to mimic the spin properties of electrons.
[ { "created": "Wed, 22 Jan 2014 09:56:44 GMT", "version": "v1" } ]
2014-01-23
[ [ "He", "Cheng", "" ], [ "Sun", "Xiao-Chen", "" ], [ "Liu", "Xiao-ping", "" ], [ "Liu", "Zi-Wen", "" ], [ "Chen", "Yulin", "" ], [ "Lu", "Ming-Hui", "" ], [ "Chen", "Yan-Feng", "" ] ]
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1401.5607
Vincenzo De Florio
Vincenzo De Florio
Quality Indicators for Collective Systems Resilience
In submission(revised version) to Technological Forecasting & Social Change
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null
null
cs.CY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Resilience is widely recognized as an important design goal though it is one that seems to escape a general and consensual understanding. Often mixed up with other system attributes; traditionally used with different meanings in as many different disciplines; sought or applied through diverse approaches in various application domains, resilience in fact is a multi-attribute property that implies a number of constitutive abilities. To further complicate the matter, resilience is not an absolute property but rather it is the result of the match between a system, its current condition, and the environment it is set to operate in. In this paper we discuss this problem and provide a definition of resilience as a property measurable as a system-environment fit. This brings to the foreground the dynamic nature of resilience as well as its hard dependence on the context. A major problem becomes then that, being a dynamic figure, resilience cannot be assessed in absolute terms. As a way to partially overcome this obstacle, in this paper we provide a number of indicators of the quality of resilience. Our focus here is that of collective systems, namely those systems resulting from the union of multiple individual parts, sub-systems, or organs. Through several examples of such systems we observe how our indicators provide insight, at least in the cases at hand, on design flaws potentially affecting the efficiency of the resilience strategies. A number of conjectures are finally put forward to associate our indicators with factors affecting the quality of resilience.
[ { "created": "Wed, 22 Jan 2014 10:07:45 GMT", "version": "v1" } ]
2014-01-23
[ [ "De Florio", "Vincenzo", "" ] ]
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1401.5612
Aymen Louati
Aymen Louati, Chadlia Jerad, Kamel Barkaoui
Formalization and Verification of Hierarchical Use of Interaction Overview Diagrams Using Timing Diagrams
8 pages, 6 figures
null
null
null
cs.SE cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Thanks to its graphical notation and simplicity, Unified Modeling Language (UML) is a de facto standard and a widespread language used in both industry and academia, despite the fact that its semantics is still informal. The Interaction Overview Diagram (IOD) is introduced in UML2; it allows the specification of the behavior in the hierarchical way. This paper is a contribution towards a formal dynamic semantics of UML2. We start by formalizing the Hierarchical use of IOD. Afterward, we complete the mapping of IOD, Sequence Diagrams and Timing Diagrams into Hierarchical Colored Petri Nets (HCPNs) using the Timed colored Petri Nets (timed CP-net). Our approach helps designers to get benefits from abstraction as well as refinement at more than two levels of hierarchy which reduces verification complexity.
[ { "created": "Wed, 22 Jan 2014 10:22:32 GMT", "version": "v1" } ]
2014-01-23
[ [ "Louati", "Aymen", "" ], [ "Jerad", "Chadlia", "" ], [ "Barkaoui", "Kamel", "" ] ]
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1401.5620
Stefano Musacchio
Enrico Deusebio, Guido Boffetta, Erik Lindborg, Stefano Musacchio
Dimensional transition in rotating turbulence
null
null
10.1103/PhysRevE.90.023005
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this work we investigate, by means of direct numerical simulations, how rotation affects the bi-dimensionalization of a turbulent flow. We study a thin layer of fluid, forced by a two-dimensional forcing, within the framework of the "split cascade" in which the injected energy flows both to small scales (generating the direct cascade) and to large scale (to form the inverse cascade). It is shown that rotation reinforces the inverse cascade at the expense of the direct one, thus promoting bi-dimensionalization of the flow. This is achieved by a suppression of the enstrophy production at large scales. Nonetheless, we find that, in the range of rotation rates investigated, increasing the the vertical scale causes a reduction of the flux of the inverse cascade. Our results suggest that, even in rotating flows, the inverse cascade may eventually disappear when the vertical scale is sufficiently large with respect to the forcing scale.
[ { "created": "Wed, 22 Jan 2014 11:11:49 GMT", "version": "v1" }, { "created": "Sat, 31 May 2014 12:18:01 GMT", "version": "v2" } ]
2015-06-18
[ [ "Deusebio", "Enrico", "" ], [ "Boffetta", "Guido", "" ], [ "Lindborg", "Erik", "" ], [ "Musacchio", "Stefano", "" ] ]
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1401.5630
Taha Sochi
P.J. Storey and Taha Sochi
The Continuum Emission Spectrum of Hf 2-2 near the Balmer Limit and the ORL versus CEL abundance and temperature Discrepancy
7 pages, 6 figures, 3 tables
null
10.1093/mnras/stu477
null
astro-ph.SR physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The continuum spectrum of the planetary nebula Hf 2-2 close to the Balmer discontinuity is modeled in the context of the long standing problem of the abundance and temperature discrepancy found when analyzing optical recombination lines and collisionally excited forbidden lines in nebulae. Models are constructed using single and double Maxwell-Boltzmann distributions as well as kappa-distributions for the energies of the free electrons. New results for the necessary continuum and line emission coefficients are presented calculated with kappa-distributed energies. The best fit to the observed continuum spectrum is found to be a model comprising two components with dramatically different temperatures and with a Maxwell-Boltzmann distribution of electron energies. On the basis of a chi-squared analysis, this model is strongly favored over a model with kappa-distributed electron energies.
[ { "created": "Wed, 22 Jan 2014 11:38:21 GMT", "version": "v1" } ]
2014-04-10
[ [ "Storey", "P. J.", "" ], [ "Sochi", "Taha", "" ] ]
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1401.5631
Antoine Bret
Antoine Bret
Robustness of the filamentation instability in arbitrarily oriented magnetic field: Full 3D calculation
To appear in Physics of Plasmas
null
10.1063/1.4864071
null
physics.plasm-ph astro-ph.HE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The filamentation (Weibel) instability plays a key role in the formation of collisionless shocks which are thought to produce Gamma-Ray-Bursts and High-Energy-Cosmic-Rays in astrophysical environments. While it has been known for long that a flow-aligned magnetic field can completely quench the instability, it was recently proved in 2D that in the cold regime, such cancelation is possible if and only if the field is perfectly aligned. Here, this result is finally extended to a 3D geometry. Calculations are conducted for symmetric and asymmetric counter-streaming relativistic plasma shells. 2D results are retrieved in 3D: the instability can never be completely canceled for an oblique magnetic field. In addition, the maximum growth-rate is always larger for wave vectors lying in the plan defined by the flow and the oblique field. On the one hand, this bears consequences on the orientation of the generated filaments. On the other hand, it certifies 2D simulations of the problem can be performed without missing the most unstable filamentation modes.
[ { "created": "Wed, 22 Jan 2014 11:47:30 GMT", "version": "v1" } ]
2015-06-18
[ [ "Bret", "Antoine", "" ] ]
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1401.5632
Manoj Krishnaswamy
Manoj Krishnaswamy, G. Hemantha Kumar
Enhancing Template Security of Face Biometrics by Using Edge Detection and Hashing
11 pages, 13 figures, Journal. arXiv admin note: text overlap with arXiv:1307.7474 by other authors
International Journal of Information Processing, 7(4), 11-20, 2013, ISSN : 0973-8215
null
null
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we address the issues of using edge detection techniques on facial images to produce cancellable biometric templates and a novel method for template verification against tampering. With increasing use of biometrics, there is a real threat for the conventional systems using face databases, which store images of users in raw and unaltered form. If compromised not only it is irrevocable, but can be misused for cross-matching across different databases. So it is desirable to generate and store revocable templates for the same user in different applications to prevent cross-matching and to enhance security, while maintaining privacy and ethics. By comparing different edge detection methods it has been observed that the edge detection based on the Roberts Cross operator performs consistently well across multiple face datasets, in which the face images have been taken under a variety of conditions. We have proposed a novel scheme using hashing, for extra verification, in order to harden the security of the stored biometric templates.
[ { "created": "Wed, 22 Jan 2014 11:50:08 GMT", "version": "v1" } ]
2014-01-23
[ [ "Krishnaswamy", "Manoj", "" ], [ "Kumar", "G. Hemantha", "" ] ]
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1401.5634
Eugene Rosenfeld
E. V. Rosenfeld, A. V. Zakharov
Relation between the charge/discharge processes of dust particles and the dynamics of dust clouds over the Moon surface
in Russian
null
null
null
astro-ph.EP physics.space-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
It is shown that the appearance of lunar horizon glow and streamers observed above the lunar terminator described by the dynamic fountain mode byl Stubbs et al. (2006) requires a value of dust particles charge several orders exceed what they obtain on the Lunar surface. To obtain a sufficient charge due to a departure of photoelectrons separated submicron particles have to flow over the surface during tens of seconds or even several minutes. Therefore for emergence of dust streamers at the lunar sunrise it is necessary that dust particles do not lose the positive charge during a night.
[ { "created": "Wed, 22 Jan 2014 11:55:05 GMT", "version": "v1" } ]
2014-01-23
[ [ "Rosenfeld", "E. V.", "" ], [ "Zakharov", "A. V.", "" ] ]
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1401.5635
Nicolas Gautier
Nicolas Gautier and Jean-Luc Aider
Experimental Feed-Forward Control of the Backwards-Facing Step Flow
null
null
null
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Closed-loop control of an amplifier flow is experimentally investigated. A feed-forward algorithm is implemented to control the flow downstream a backward-facing step. Upstream and downstream data are extracted from real-time velocity fields to compute an ARMAX model used to effect actuation. This work, done at Reynolds number 430 investigates the practical feasibility of this approach which has shown great promise in a recent numerical study by Herv\'e et al (2012). The linear nature of the regime is checked, 2D upstream perturbations are introduced, and the degree to which the flow can be controlled is quantified. The resulting actuation is able to effectively reduce downstream energy levels and fluctuations. The limitations and difficulties of applying such an approach to an experiment are also emphasized.
[ { "created": "Wed, 22 Jan 2014 11:55:26 GMT", "version": "v1" }, { "created": "Mon, 24 Mar 2014 10:40:28 GMT", "version": "v2" } ]
2014-03-25
[ [ "Gautier", "Nicolas", "" ], [ "Aider", "Jean-Luc", "" ] ]
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1401.5636
Shohei Shimizu
Takanori Inazumi, Takashi Washio, Shohei Shimizu, Joe Suzuki, Akihiro Yamamoto, Yoshinobu Kawahara
Causal Discovery in a Binary Exclusive-or Skew Acyclic Model: BExSAM
10 pages. A longer version of our UAI2011 paper (Inazumi et al., 2011). arXiv admin note: text overlap with arXiv:1202.3736
null
null
null
stat.ML cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Discovering causal relations among observed variables in a given data set is a major objective in studies of statistics and artificial intelligence. Recently, some techniques to discover a unique causal model have been explored based on non-Gaussianity of the observed data distribution. However, most of these are limited to continuous data. In this paper, we present a novel causal model for binary data and propose an efficient new approach to deriving the unique causal model governing a given binary data set under skew distributions of external binary noises. Experimental evaluation shows excellent performance for both artificial and real world data sets.
[ { "created": "Wed, 22 Jan 2014 11:58:27 GMT", "version": "v1" } ]
2014-01-23
[ [ "Inazumi", "Takanori", "" ], [ "Washio", "Takashi", "" ], [ "Shimizu", "Shohei", "" ], [ "Suzuki", "Joe", "" ], [ "Yamamoto", "Akihiro", "" ], [ "Kawahara", "Yoshinobu", "" ] ]
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1401.5638
Youcef Dahmani
Dahmani Youcef, Hamri Maamar
Specification of the State Lifetime in the DEVS Formalism by Fuzzy Controller
IJAIT International Journal of Advanced Information Technology (IJAIT) Vol. 3, No.2, April 2013
null
10.5121/ijait.2013.3201
null
cs.OH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper aims to develop a new approach to assess the duration of state in the DEVS formalism by fuzzy controller. The idea is to define a set of fuzzy rules obtained from observers or expert knowledge and to specify a fuzzy model which computes this duration, this latter is fed into the simulator to specify the new value in the model. In conventional model, each state is defined by a mean lifetime value whereas our method, calculates for each state the new lifetime according to inputs values. A wildfire case study is presented at the end of the paper. It is a challenging task due to its complex behavior, dynamical weather condition, and various variables involved. A global specification of the fuzzy controller and the forest fire model are presented in the DEVS formalism and comparison between conventional and fuzzy method is illustrated.
[ { "created": "Wed, 22 Jan 2014 12:00:23 GMT", "version": "v1" } ]
2014-01-23
[ [ "Youcef", "Dahmani", "" ], [ "Maamar", "Hamri", "" ] ]
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1401.5643
Francis Robicheaux
P. L. Price, L. D. Noordam, H. B. van Linden van den Heuvell, and F. Robicheaux
Hole burning and higher order photon effects in attosecond light-atom interaction
null
Phys. Rev. A 89, 033414 (2014)
10.1103/PhysRevA.89.033414
null
physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We have performed calculations of attosecond laser-atom interactions for laser intensities where interesting two and three photon effects become relevant. In particular, we examine the case of "hole burning" in the initial orbital. Hole burning is present when the laser pulse duration is shorter than the classical radial period because the electron preferentially absorbs the photon near the nucleus. We also examine how 3 photon Raman process can lead to a time delay in the outgoing electron for the energy near one photon absorption. For excitation out of the hydrogen $2s$ state, an intensity of $2.2\times 10^{16}$ W/cm$^2$ leads to a 6 attosecond delay of the outgoing electron. We argue that this delay is due to the hole burning in the initial state.
[ { "created": "Wed, 22 Jan 2014 12:33:59 GMT", "version": "v1" } ]
2014-06-02
[ [ "Price", "P. L.", "" ], [ "Noordam", "L. D.", "" ], [ "Heuvell", "H. B. van Linden van den", "" ], [ "Robicheaux", "F.", "" ] ]
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1401.5644
Issam Sahmoudi issam sahmoudi
Issam Sahmoudi and Hanane Froud and Abdelmonaime Lachkar
A new keyphrases extraction method based on suffix tree data structure for arabic documents clustering
17 pages, 3 figures
International Journal of Database Management Systems ( IJDMS ) Vol.5, No.6, December 2013
10.5121/ijdms.2013.5602
null
cs.CL cs.IR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Document Clustering is a branch of a larger area of scientific study known as data mining .which is an unsupervised classification using to find a structure in a collection of unlabeled data. The useful information in the documents can be accompanied by a large amount of noise words when using Full Text Representation, and therefore will affect negatively the result of the clustering process. So it is with great need to eliminate the noise words and keeping just the useful information in order to enhance the quality of the clustering results. This problem occurs with different degree for any language such as English, European, Hindi, Chinese, and Arabic Language. To overcome this problem, in this paper, we propose a new and efficient Keyphrases extraction method based on the Suffix Tree data structure (KpST), the extracted Keyphrases are then used in the clustering process instead of Full Text Representation. The proposed method for Keyphrases extraction is language independent and therefore it may be applied to any language. In this investigation, we are interested to deal with the Arabic language which is one of the most complex languages. To evaluate our method, we conduct an experimental study on Arabic Documents using the most popular Clustering approach of Hierarchical algorithms: Agglomerative Hierarchical algorithm with seven linkage techniques and a variety of distance functions and similarity measures to perform Arabic Document Clustering task. The obtained results show that our method for extracting Keyphrases increases the quality of the clustering results. We propose also to study the effect of using the stemming for the testing dataset to cluster it with the same documents clustering techniques and similarity/distance measures.
[ { "created": "Wed, 22 Jan 2014 12:36:38 GMT", "version": "v1" } ]
2014-01-23
[ [ "Sahmoudi", "Issam", "" ], [ "Froud", "Hanane", "" ], [ "Lachkar", "Abdelmonaime", "" ] ]
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1401.5648
Luis Enrique Correa Rocha Dr
Luis Enrique Correa Rocha and Naoki Masuda
Random walk centrality for temporal networks
main text + supplementary material
New Journal of Physics 16 063023 (2014)
10.1088/1367-2630/16/6/063023
null
physics.soc-ph cs.SI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Nodes can be ranked according to their relative importance within the network. Ranking algorithms based on random walks are particularly useful because they connect topological and diffusive properties of the network. Previous methods based on random walks, as for example the PageRank, have focused on static structures. However, several realistic networks are indeed dynamic, meaning that their structure changes in time. In this paper, we propose a centrality measure for temporal networks based on random walks which we call TempoRank. While in a static network, the stationary density of the random walk is proportional to the degree or the strength of a node, we find that in temporal networks, the stationary density is proportional to the in-strength of the so-called effective network. The stationary density also depends on the sojourn probability q which regulates the tendency of the walker to stay in the node. We apply our method to human interaction networks and show that although it is important for a node to be connected to another node with many random walkers at the right moment (one of the principles of the PageRank), this effect is negligible in practice when the time order of link activation is included.
[ { "created": "Wed, 22 Jan 2014 13:02:01 GMT", "version": "v1" } ]
2014-06-17
[ [ "Rocha", "Luis Enrique Correa", "" ], [ "Masuda", "Naoki", "" ] ]
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1401.5657
Marek Kurdej
Marek Kurdej (HEUDIASYC), Julien Moras (HEUDIASYC), V\'eronique Cherfaoui (HEUDIASYC), Philippe Bonnifait (HEUDIASYC)
Enhancing Mobile Object Classification Using Geo-referenced Maps and Evidential Grids
6 pp. arXiv admin note: substantial text overlap with arXiv:1207.1016
IEEE/RSJ International Conference on Intelligent Robots and Systems. 5th Workshop on Planning, Perception and Navigation for Intelligent Vehicles, Tokyo : Japan (2013)
null
null
cs.RO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Evidential grids have recently shown interesting properties for mobile object perception. Evidential grids are a generalisation of Bayesian occupancy grids using Dempster- Shafer theory. In particular, these grids can handle efficiently partial information. The novelty of this article is to propose a perception scheme enhanced by geo-referenced maps used as an additional source of information, which is fused with a sensor grid. The paper presents the key stages of such a data fusion process. An adaptation of conjunctive combination rule is presented to refine the analysis of the conflicting information. The method uses temporal accumulation to make the distinction between stationary and mobile objects, and applies contextual discounting for modelling information obsolescence. As a result, the method is able to better characterise the occupied cells by differentiating, for instance, moving objects, parked cars, urban infrastructure and buildings. Experiments carried out on real- world data illustrate the benefits of such an approach.
[ { "created": "Wed, 22 Jan 2014 13:18:13 GMT", "version": "v1" } ]
2014-01-23
[ [ "Kurdej", "Marek", "", "HEUDIASYC" ], [ "Moras", "Julien", "", "HEUDIASYC" ], [ "Cherfaoui", "Véronique", "", "HEUDIASYC" ], [ "Bonnifait", "Philippe", "", "HEUDIASYC" ] ]
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1401.5660
Sergey Skipetrov E
C. P. Lapointe, P. Zakharov, F. Enderli, T. Feurer, S. E. Skipetrov and F. Scheffold
Numerical study of Anderson localization of terahertz waves in disordered waveguides
6 pages, 5 figures
EPL 105, 34002 (2014)
10.1209/0295-5075/105/34002
null
physics.optics cond-mat.dis-nn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a numerical study of electromagnetic wave transport in disordered quasi-one-dimensional waveguides at terahertz frequencies. Finite element method calculations of terahertz wave propagation within LiNbO$_{3}$ waveguides with randomly arranged air-filled circular scatterers exhibit an onset of Anderson localization at experimentally accessible length scales. Results for the average transmission as a function of waveguide length and scatterer density demonstrate a clear crossover from diffusive to localized transport regime. In addition, we find that transmission fluctuations grow dramatically when crossing into the localized regime. Our numerical results are in good quantitative agreement with theory over a wide range of experimentally accessible parameters both in the diffusive and localized regime opening the path towards experimental observation of terahertz wave localization.
[ { "created": "Wed, 22 Jan 2014 13:27:02 GMT", "version": "v1" } ]
2014-02-21
[ [ "Lapointe", "C. P.", "" ], [ "Zakharov", "P.", "" ], [ "Enderli", "F.", "" ], [ "Feurer", "T.", "" ], [ "Skipetrov", "S. E.", "" ], [ "Scheffold", "F.", "" ] ]
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