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1401.5952
Alberto Comin
Alberto Comin, Richard Ciesielski, Giovanni Piredda, Kevin Donkers, Achim Hartschuh
Compression of Ultrashort Laser Pulses via Gated Multiphoton Intrapulse Interference Phase Scans
11 pages, 7 figures
null
10.1364/JOSAB.31.001118
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Delivering femtosecond laser light in the focal plane of a high numerical aperture microscope objective is still a challenge, despite significant developments in the generation of ultrashort pulses. One of the most popular techniques, used to correct phase distortions resulting from propagation through transparent media, is the multiphoton intrapulse interference phase scan (MIIPS). The accuracy of MIIPS however is limited when higher order phase distortions are present. Here we introduce an improvement, called Gated-MIIPS, which avoids shortcomings of MIIPS, reduces the influence of higher order phase terms, and can be used to more efficiently compress broad band laser pulses even with a simple 4f pulse shaper setup. In this work we present analytical formulas for MIIPS and Gated-MIIPS valid for chirped Gaussian pulses; we show an approximated analytic expression for Gated-MIIPS valid for arbitrary pulse shapes; finally we demonstrate the increased accuracy of Gated-MIIPS via experiment and numerical simulation.
[ { "created": "Thu, 23 Jan 2014 12:15:04 GMT", "version": "v1" }, { "created": "Wed, 26 Mar 2014 11:06:42 GMT", "version": "v2" } ]
2015-06-18
[ [ "Comin", "Alberto", "" ], [ "Ciesielski", "Richard", "" ], [ "Piredda", "Giovanni", "" ], [ "Donkers", "Kevin", "" ], [ "Hartschuh", "Achim", "" ] ]
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1401.5953
Abhisekh Sankaran
Abhisekh Sankaran, Bharat Adsul, Supratik Chakraborty
A Generalization of the {\L}o\'s-Tarski Preservation Theorem over Classes of Finite Structures
28 pages, 1 figure
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null
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cs.LO math.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We investigate a generalization of the {\L}o\'s-Tarski preservation theorem via the semantic notion of \emph{preservation under substructures modulo $k$-sized cores}. It was shown earlier that over arbitrary structures, this semantic notion for first-order logic corresponds to definability by $\exists^k\forall^*$ sentences. In this paper, we identify two properties of classes of finite structures that ensure the above correspondence. The first is based on well-quasi-ordering under the embedding relation. The second is a logic-based combinatorial property that strictly generalizes the first. We show that starting with classes satisfying any of these properties, the classes obtained by applying operations like disjoint union, cartesian and tensor products, or by forming words and trees over the classes, inherit the same property. As a fallout, we obtain interesting classes of structures over which an effective version of the {\L}o\'s-Tarski theorem holds.
[ { "created": "Thu, 23 Jan 2014 12:15:37 GMT", "version": "v1" } ]
2014-01-24
[ [ "Sankaran", "Abhisekh", "" ], [ "Adsul", "Bharat", "" ], [ "Chakraborty", "Supratik", "" ] ]
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1401.5954
Michel Peyrard
Johannes-Geert Hagmann, Naoko Nakagawa and Michel Peyrard
Characterization of the low temperature properties of a simplified protein model
null
Phys. Rev. E 89, 012705-1-13 (2014)
10.1103/PhysRevE.89.012705
null
cond-mat.stat-mech cond-mat.soft physics.bio-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Prompted by results that showed that a simple protein model, the frustrated G\=o model, appears to exhibit a transition reminiscent of the protein dynamical transition, we examine the validity of this model to describe the low-temperature properties of proteins. First, we examine equilibrium fluctuations. We calculate its incoherent neutron-scattering structure factor and show that it can be well described by a theory using the one-phonon approximation. By performing an inherent structure analysis, we assess the transitions among energy states at low temperatures. Then, we examine non-equilibrium fluctuations after a sudden cooling of the protein. We investigate the violation of the fluctuation--dissipation theorem in order to analyze the protein glass transition. We find that the effective temperature of the quenched protein deviates from the temperature of the thermostat, however it relaxes towards the actual temperature with an Arrhenius behavior as the waiting time increases. These results of the equilibrium and non-equilibrium studies converge to the conclusion that the apparent dynamical transition of this coarse-grained model cannot be attributed to a glassy behavior.
[ { "created": "Thu, 23 Jan 2014 12:23:17 GMT", "version": "v1" } ]
2014-01-24
[ [ "Hagmann", "Johannes-Geert", "" ], [ "Nakagawa", "Naoko", "" ], [ "Peyrard", "Michel", "" ] ]
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1401.5957
Mark Levene
Trevor Fenner, Mark Levene, and George Loizou
A stochastic evolutionary model for survival dynamics
10 pages, 2 figures
null
10.1016/j.physa.2014.05.038
null
physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The recent interest in human dynamics has led researchers to investigate the stochastic processes that explain human behaviour in different contexts. Here we propose a generative model to capture the essential dynamics of survival analysis, traditionally employed in clinical trials and reliability analysis in engineering. In our model, the only implicit assumption made is that the longer an actor has been in the system, the more likely it is to have failed. We derive a power-law distribution for the process and provide preliminary empirical evidence for the validity of the model from two well-known survival analysis data sets.
[ { "created": "Thu, 23 Jan 2014 12:37:06 GMT", "version": "v1" }, { "created": "Wed, 7 May 2014 07:04:13 GMT", "version": "v2" } ]
2015-06-18
[ [ "Fenner", "Trevor", "" ], [ "Levene", "Mark", "" ], [ "Loizou", "George", "" ] ]
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1401.5959
Markus Lange-Hegermann
Markus Lange-Hegermann
The Differential Dimension Polynomial for Characterizable Differential Ideals
null
null
null
null
math.AC cs.SC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We generalize the differential dimension polynomial from prime differential ideals to characterizable differential ideals. Its computation is algorithmic, its degree and leading coefficient remain differential birational invariants, and it decides equality of characterizable differential ideals contained in each other.
[ { "created": "Thu, 23 Jan 2014 12:39:17 GMT", "version": "v1" } ]
2014-01-25
[ [ "Lange-Hegermann", "Markus", "" ] ]
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1401.5965
Gwennou Coupier
Pierre-Yves Gires and Aparna Srivastav and Chaouqi Misbah and Thomas Podgorski and Gwennou Coupier
Pairwise hydrodynamic interactions and diffusion in a vesicle suspension
null
Phys. Fluids 26, 013304 (2014)
10.1063/1.4861900
null
physics.flu-dyn cond-mat.soft physics.bio-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The hydrodynamic interaction of two deformable vesicles in shear flow induces a net displacement, in most cases an increase of their distance in the transverse direction. The statistical average of these interactions leads to shear-induced diffusion in the suspension, both at the level of individual particles which experience a random walk made of successive interactions, and at the level of suspension where a non-linear down-gradient diffusion takes place, an important ingredient in the structuring of suspension flows. We make an experimental and computational study of the interaction of a pair of lipid vesicles in shear flow by varying physical parameters, and investigate the decay of the net lateral displacement with the distance between the streamlines on which the vesicles are initially located. This decay and its dependency upon vesicle properties can be accounted for by a simple model based on the well established law for the lateral drift of a vesicle in the vicinity of a wall. In the semi-dilute regime, a determination of self-diffusion coefficients is presented.
[ { "created": "Thu, 23 Jan 2014 13:23:26 GMT", "version": "v1" } ]
2014-01-24
[ [ "Gires", "Pierre-Yves", "" ], [ "Srivastav", "Aparna", "" ], [ "Misbah", "Chaouqi", "" ], [ "Podgorski", "Thomas", "" ], [ "Coupier", "Gwennou", "" ] ]
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1401.5966
Hossein Hosseini
Hossein Hosseini, Ali Goli, Neda Barzegar Marvasti, Masoume Azghani and Farokh Marvasti
Image Block Loss Restoration Using Sparsity Pattern as Side Information
null
null
null
null
cs.MM cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we propose a method for image block loss restoration based on the notion of sparse representation. We use the sparsity pattern as side information to efficiently restore block losses by iteratively imposing the constraints of spatial and transform domains on the corrupted image. Two novel features, including a pre-interpolation and a criterion for stopping the iterations, are proposed to improve the performance. Also, to deal with practical applications, we develop a technique to transmit the side information along with the image. In this technique, we first compress the side information and then embed its LDPC coded version in the least significant bits of the image pixels. This technique ensures the error-free transmission of the side information, while causing only a small perturbation on the transmitted image. Mathematical analysis and extensive simulations are performed to validate the method and investigate the efficiency of the proposed techniques. The results verify that the proposed method outperforms its counterparts for image block loss restoration.
[ { "created": "Thu, 23 Jan 2014 13:23:27 GMT", "version": "v1" }, { "created": "Sat, 27 Aug 2016 00:50:13 GMT", "version": "v2" } ]
2016-08-30
[ [ "Hosseini", "Hossein", "" ], [ "Goli", "Ali", "" ], [ "Marvasti", "Neda Barzegar", "" ], [ "Azghani", "Masoume", "" ], [ "Marvasti", "Farokh", "" ] ]
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1401.5968
Pekka Janhunen
Pekka Janhunen
Simulation study of the plasma brake effect
15 pages, 17 figures, 2 tables, in press in Annales Geophysicae
null
10.5194/angeo-32-1207-2014
null
astro-ph.IM physics.plasm-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The plasma brake is a thin negatively biased tether which has been proposed as an efficient concept for deorbiting satellites and debris objects from low Earth orbit. We simulate the interaction with the ionospheric plasma ram flow with the plasma brake tether by a high performance electrostatic particle in cell code to evaluate the thrust. The tether is assumed to be perpendicular to the flow. We perform runs for different tether voltage, magnetic field orientation and plasma ion mass. We show that a simple analytical thrust formula reproduces most of the simulation results well. The interaction with the tether and the plasma flow is laminar (i.e., smooth and not turbulent) when the magnetic field is perpendicular to the tether and the flow. If the magnetic field is parallel to the tether, the behaviour is unstable and thrust is reduced by a modest factor. The case when the magnetic field is aligned with the flow can also be unstable, but does not result in notable thrust reduction. We also fix an error in an earlier reference. According to the simulations, the predicted thrust of the plasma brake is large enough to make the method promising for low Earth orbit (LEO) satellite deorbiting. As a numerical example we estimate that a 5 km long plasma brake tether weighing 0.055 kg could produce 0.43 mN breaking force which is enough to reduce the orbital altitude of a 260 kg object mass by 100 km during one year.
[ { "created": "Thu, 23 Jan 2014 13:37:14 GMT", "version": "v1" }, { "created": "Fri, 29 Aug 2014 06:47:57 GMT", "version": "v2" } ]
2015-06-18
[ [ "Janhunen", "Pekka", "" ] ]
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1401.5972
Anatoliy Lukyanov Dr
A.E. Belyaev, N.I. Klyui, R.V. Konakova, A.M. Luk'yanov, Yu.M. Sveshnikov, A.M. Klyui
Optical properties of irradiated epitaxial GaN films
null
Ukrainian Journal of Physics, 2009, Vol. 54, no. 1-2, pp. 207-215 (www.ujp.bitp.kiev.ua)
null
null
cond-mat.mtrl-sci physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The influence of a microwave treatment (MWT) on the optical properties of hexagonal GaN films has been studied. To estimate the internal mechanical strains and the degree of structural perfection in a thin near-surface layer of the film, the electroreflectance (ER) method is used. The ER spectra are measured in the interval of the first direct interband transitions. It has been shown that the MWT results in the relaxation of internal mechanical strains in the irradiated films. In addition, the structural perfection in the thin near-surface layer of the irradiated film became higher. A mechanism that includes resonance effects and the local heating of the film defect regions is proposed to explain the effects observed.
[ { "created": "Thu, 23 Jan 2014 13:41:37 GMT", "version": "v1" } ]
2014-01-24
[ [ "Belyaev", "A. E.", "" ], [ "Klyui", "N. I.", "" ], [ "Konakova", "R. V.", "" ], [ "Luk'yanov", "A. M.", "" ], [ "Sveshnikov", "Yu. M.", "" ], [ "Klyui", "A. M.", "" ] ]
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1401.5976
Heiko Bauke
Sven Ahrens, Heiko Bauke, Christoph H. Keitel, Rainer Grobe
Electron-spin dynamics induced by photon spins
null
New Journal of Physics, vol. 16, article 103028 (2014)
10.1088/1367-2630/16/10/103028
null
quant-ph physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Strong rotating magnetic fields may cause a precession of the electron's spin around the rotation axis of the magnetic field. The superposition of two counterpropagating laser beams with circular polarization and opposite helicity features such a rotating magnetic field component but also carries spin. The laser's spin density, that can be expressed in terms of the lase's electromagnetic fields and potentials, couples to the electron's spin via a relativistic correction to the Pauli equation. We show that the quantum mechanical interaction of the electron's spin with the laser's rotating magnetic field and with the laser's spin density counteract each other in such a way that a net spin rotation remains with a precession frequency that is much smaller than the frequency one would expect from the rotating magnetic field alone. In particular, the frequency scales differently with the laser's electric field strength depending on if relativistic corrections are taken into account or not. Thus, the relativistic coupling of the electron's spin to the laser's spin density changes the dynamics not only quantitatively but also qualitatively as compared to the nonrelativistic theory. The electron's spin dynamics is a genuine quantum mechanical relativistic effect.
[ { "created": "Thu, 23 Jan 2014 14:03:30 GMT", "version": "v1" }, { "created": "Wed, 15 Oct 2014 20:03:08 GMT", "version": "v2" } ]
2014-10-17
[ [ "Ahrens", "Sven", "" ], [ "Bauke", "Heiko", "" ], [ "Keitel", "Christoph H.", "" ], [ "Grobe", "Rainer", "" ] ]
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1401.5980
Dimitri Kartsaklis
Dimitri Kartsaklis, Mehrnoosh Sadrzadeh, Stephen Pulman, Bob Coecke
Reasoning about Meaning in Natural Language with Compact Closed Categories and Frobenius Algebras
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null
null
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cs.CL cs.AI math.CT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Compact closed categories have found applications in modeling quantum information protocols by Abramsky-Coecke. They also provide semantics for Lambek's pregroup algebras, applied to formalizing the grammatical structure of natural language, and are implicit in a distributional model of word meaning based on vector spaces. Specifically, in previous work Coecke-Clark-Sadrzadeh used the product category of pregroups with vector spaces and provided a distributional model of meaning for sentences. We recast this theory in terms of strongly monoidal functors and advance it via Frobenius algebras over vector spaces. The former are used to formalize topological quantum field theories by Atiyah and Baez-Dolan, and the latter are used to model classical data in quantum protocols by Coecke-Pavlovic-Vicary. The Frobenius algebras enable us to work in a single space in which meanings of words, phrases, and sentences of any structure live. Hence we can compare meanings of different language constructs and enhance the applicability of the theory. We report on experimental results on a number of language tasks and verify the theoretical predictions.
[ { "created": "Thu, 23 Jan 2014 14:20:58 GMT", "version": "v1" } ]
2014-05-13
[ [ "Kartsaklis", "Dimitri", "" ], [ "Sadrzadeh", "Mehrnoosh", "" ], [ "Pulman", "Stephen", "" ], [ "Coecke", "Bob", "" ] ]
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1401.5986
Lutz Bornmann Dr.
Lutz Bornmann
How are excellent (highly cited) papers defined in bibliometrics? A quantitative analysis of the literature
Accepted for publication in Research Evaluation
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null
null
cs.DL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
As the subject of research excellence has received increasing attention (in science policy) over the last few decades, increasing numbers of bibliometric studies have been published dealing with excellent papers. However, many different methods have been used in these studies to identify excellent papers. The present quantitative analysis of the literature has been carried out in order to acquire an overview of these methods and an indication of an "average" or "most frequent" bibliometric practice. The search in the Web of Science yielded 321 papers dealing with "highly cited", "most cited", "top cited" and "most frequently cited". Of the 321 papers, 16 could not be used in this study. In around 80% of the papers analyzed in this study, a quantitative definition has been provided with which to identify excellent papers. With definitions which relate to an absolute number, either a certain number of top cited papers (58%) or papers with a minimum number of citations are selected (17%). Around 23% worked with percentile rank classes. Over these papers, there is an arithmetic average of the top 7.6% (arithmetic average) or of the top 3% (median). The top 1% is used most frequently in the papers, followed by the top 10%. With the thresholds presented in this study, in future, it will be possible to identify excellent papers based on an "average" or "most frequent" practice among bibliometricians.
[ { "created": "Wed, 22 Jan 2014 12:07:55 GMT", "version": "v1" } ]
2014-01-24
[ [ "Bornmann", "Lutz", "" ] ]
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1401.5991
Dieter Bothe
Dieter Bothe, Wolfgang Dreyer
Continuum thermodynamics of chemically reacting fluid mixtures
null
Acta Mechanica 226, 1757-1805 (2015)
10.1007/s00707-014-1275-1
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider viscous, heat conducting mixtures of molecularly miscible chemical species forming a fluid in which the constituents can undergo chemical reactions. Assuming a common temperature for all components, we derive a closed system of partial mass and partial momentum balances plus a mixture balance of internal energy. This is achieved by careful exploitation of the entropy principle and requires appropriate definitions of absolute temperature and chemical potentials, based on an adequate definition of thermal energy excluding diffusive contributions. The resulting interaction forces split into a thermo-mechanical and a chemical part, where the former turns out to be symmetric in case of binary interactions. For chemically reacting systems and as a new result, the chemical interaction force is a contribution being non-symmetric outside of chemical equilibrium. The theory also provides a rigorous derivation of the so-called generalized thermodynamic driving forces, avoiding the use of approximate solutions to the Boltzmann equations. Moreover, using an appropriately extended version of the entropy principle and introducing cross-effects already before closure as entropy invariant couplings between principal dissipative mechanisms, the Onsager symmetry relations become a strict consequence. With a classification of the factors in the binary products of the entropy production according to their parity--instead of the classical partition into so-called fluxes and driving forces--the apparent anti-symmetry of certain couplings is thereby also revealed. If the diffusion velocities are small compared to the speed of sound, the Maxwell-Stefan equations follow in the case without chemistry, thereby neglecting wave phenomena in the diffusive motion. This results in a reduced model with only mass being balanced individually. In the reactive case ...
[ { "created": "Thu, 23 Jan 2014 14:43:10 GMT", "version": "v1" }, { "created": "Fri, 28 Feb 2014 20:27:05 GMT", "version": "v2" }, { "created": "Tue, 18 Nov 2014 14:30:34 GMT", "version": "v3" } ]
2016-04-01
[ [ "Bothe", "Dieter", "" ], [ "Dreyer", "Wolfgang", "" ] ]
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1401.5995
Rudolf Treumann
R. A. Treumann and W. Baumjohann
Collisionless Magnetic Reconnection in Space Plasmas
Review paper
Frontiers Phys., Space Physics, 1, Article 31, 2013
10.3389/fphys.2013.00031
null
physics.space-ph astro-ph.HE astro-ph.SR physics.plasm-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Magnetic reconnection requires the violation of the frozen-in condition which ties gyrating charged particles to the magnetic field inhibiting diffusion. Ongoing reconnection has been identified in near-Earth space as being responsible for the excitation of substorms, magnetic storms, generation of field aligned currents and their consequences, the wealth of auroral phenomena. Its theoretical understanding is now on the verge of being completed. Reconnection takes place in thin current sheets. Analytical concepts proceeded gradually down to the microscopic scale, the scale of the electron skin depth or inertial length, recognizing that current layers that thin do preferentially undergo spontaneous reconnection. Thick current layers start reconnecting when being forced by plasma inflow to thin. For almost half a century the physical mechanism of reconnection has remained a mystery. Spacecraft in situ observations in combination with sophisticated numerical simulations in two and three dimensions recently clarified the mist, finding that reconnection produces a specific structure of the current layer inside the electron inertial (also called electron diffusion) region around the reconnection site, the X line. Onset of reconnection is attributed to pseudo-viscous contributions of the electron pressure tensor aided by electron inertia and drag, creating a complicated structured electron current sheet, electric fields, and an electron exhaust extended along the current layer. We review the general background theory and recent developments in numerical simulation on collisionless reconnection. It is impossible to cover the entire field of reconnection in a short space-limited review. The presentation necessarily remains cursory, determined by our taste, preferences, and knowledge. Only a small amount of observations is included in order to support the few selected numerical simulations.
[ { "created": "Thu, 23 Jan 2014 15:08:32 GMT", "version": "v1" } ]
2014-01-24
[ [ "Treumann", "R. A.", "" ], [ "Baumjohann", "W.", "" ] ]
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1401.5996
Jose Teixeira
Jose Teixeira and Tingting Lin
Collaboration in the open-source arena: The WebKit case
As submitted to ACM SIG MIS Computers and People Research (CPR) May 29 - 31, 2014 Singapore
null
10.1145/2599990.2600009
null
cs.CY cs.SI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In an era of software crisis, the move of firms towards distributed software development teams is being challenged by emerging collaboration issues. On this matter, the open-source phenomenon may shed some light, as successful cases on distributed collaboration in the open-source community have been recurrently reported. In this paper, we explore the collaboration networks in the WebKit open-source project, by mining WebKit's source-code version-control-system data with Social Network Analysis (SNA). Our approach allows us to observe how key events in the mobile-device industry have affected the WebKit collaboration network over time. With our findings, we show the explanation power from network visualizations capturing the collaborative dynamics of a high-networked software project over time; and highlight the power of the open-source fork concept as a nexus enabling both features of competition and collaboration. We also reveal the WebKit project as a valuable research site manifesting the novel notion of open-coopetition, where rival firms collaborate with competitors in the open-source community.
[ { "created": "Thu, 23 Jan 2014 15:11:46 GMT", "version": "v1" } ]
2014-08-15
[ [ "Teixeira", "Jose", "" ], [ "Lin", "Tingting", "" ] ]
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1401.5997
Michael Benzaquen
Matilda Backholm, Michael Benzaquen, Thomas Salez, Elie Rapha\"el and Kari Dalnoki-Veress
Capillary levelling of a cylindrical hole in a viscous film
10 pages, 9 figures, accepted for publication in Soft Matter
Soft Matter, 10 2550 (2014)
null
null
cond-mat.soft physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The capillary levelling of cylindrical holes in viscous polystyrene films was studied using atomic force microscopy as well as quantitative analytical scaling arguments based on thin film theory and self-similarity. The relaxation of the holes was shown to consist of two different time regimes: an early regime where opposing sides of the hole do not interact, and a late regime where the hole is filling up. For the latter, the self-similar asymptotic profile was derived analytically and shown to be in excellent agreement with experimental data. Finally, a binary system of two holes in close proximity was investigated where the individual holes fill up at early times and coalesce at longer times.
[ { "created": "Thu, 23 Jan 2014 15:13:50 GMT", "version": "v1" } ]
2014-04-01
[ [ "Backholm", "Matilda", "" ], [ "Benzaquen", "Michael", "" ], [ "Salez", "Thomas", "" ], [ "Raphaël", "Elie", "" ], [ "Dalnoki-Veress", "Kari", "" ] ]
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1401.6000
Raed Jaberi
Raed Jaberi
On computing the $2$-vertex-connected components of directed graphs
null
null
null
null
cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we consider the problem of computing the $2$-vertex-connected components ($2$-vccs) of directed graphs. We present two new algorithms for solving this problem. The first algorithm runs in $O(mn^{2})$ time, the second in $O(nm)$ time. Furthermore, we show that the old algorithm of Erusalimskii and Svetlov runs in $O(nm^{2})$ time. In this paper, we investigate the relationship between $2$-vccs and dominator trees. We also present an algorithm for computing the $3$-vertex-connected components ($3$-vccs) of a directed graph in $O(n^{3}m)$ time, and we show that the $k$-vertex-connected components ($k$-vccs) of a directed graph can be computed in $O(mn^{2k-3})$ time. Finally, we consider three applications of our new algorithms, which are approximation algorithms for problems that are generalization of the problem of approximating the smallest $2$-vertex-connected spanning subgraph of $2$-vertex-connected directed graph.
[ { "created": "Thu, 23 Jan 2014 15:22:23 GMT", "version": "v1" } ]
2014-01-24
[ [ "Jaberi", "Raed", "" ] ]
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1401.6002
Cyril Voyant
Cyril Voyant (SPE), Gilles Notton (SPE), Christophe Paoli (SPE), Marie Laure Nivet (SPE), Marc Muselli (SPE), Kahina Dahmani (LRIA)
Numerical weather prediction or stochastic modeling: an objective criterion of choice for the global radiation forecasting
International Journal of Energy Technology and Policy (2014)
null
null
null
stat.AP cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Numerous methods exist and were developed for global radiation forecasting. The two most popular types are the numerical weather predictions (NWP) and the predictions using stochastic approaches. We propose to compute a parameter noted constructed in part from the mutual information which is a quantity that measures the mutual dependence of two variables. Both of these are calculated with the objective to establish the more relevant method between NWP and stochastic models concerning the current problem.
[ { "created": "Wed, 22 Jan 2014 19:33:20 GMT", "version": "v1" } ]
2014-01-24
[ [ "Voyant", "Cyril", "", "SPE" ], [ "Notton", "Gilles", "", "SPE" ], [ "Paoli", "Christophe", "", "SPE" ], [ "Nivet", "Marie Laure", "", "SPE" ], [ "Muselli", "Marc", "", "SPE" ], [ "Dahmani", "Kahina", "", "LRIA" ] ]
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1401.6003
Esben Klinkby
Esben Klinkby, Konstantin Batkov, Ferenc Mezei, Troels Sch{\o}nfeldt, Alan Takibayev, Luca Zanini
Voluminous D2 source for intense cold neutron beam production at the ESS
3 pages, 2 figures
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physics.ins-det nucl-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The development of the flat moderator concept at ESS recently opened up the possibility that a single flat moderator above the target could serve all the scattering instruments, that rely on high brightness. This would allow for the introduction of a fundamentally different moderator below the target for the complementary needs of certain fundamental physics experiments. To facilitate experiments depending on the total number of neutrons in a sizable beam, the option of a voluminous D2 moderator, in a large cross-section extraction guide is discussed and its neutronic performance is assessed.
[ { "created": "Thu, 23 Jan 2014 15:31:48 GMT", "version": "v1" } ]
2014-01-24
[ [ "Klinkby", "Esben", "" ], [ "Batkov", "Konstantin", "" ], [ "Mezei", "Ferenc", "" ], [ "Schønfeldt", "Troels", "" ], [ "Takibayev", "Alan", "" ], [ "Zanini", "Luca", "" ] ]
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1401.6007
Ian Edmonds Dr
Ian Edmonds
Evidence of two different types of short term solar modulation of regional surface temperature and cloud
30 pages, 15 figures
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null
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astro-ph.EP astro-ph.SR physics.ao-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Recent work indicates that 27 day variations in cosmic ray flux during 2007 2009 are phase locked to 27 day variations in cloud and surface temperature at Shetland. Here we extend the study to other regions including Central England, US and Australia and to several other annual intervals that exhibit strong 27 day variation in cosmic ray flux and sunspot area. Band pass filtering was used to obtain 27 day components of daily maximum temperature in each region and 27 day components of cloud variation were determined, in Australia only, from solar exposure records. When cosmic ray flux is the dominant influence phase locked variations in surface temperature occur in each of the regions with, however, in phase or anti phase variation in different regions. Similar phase locking of 27 day variation in surface temperature to sunspot area variation occurs when sunspot activity is the dominant influence with indications that changes from in phase to anti phase variation are linked to flipping of sunspot activity from one active longitude to another. The 27 day component of cloud in Australia was phase locked to the 27 day component of temperature in Central England in two of the intervals studied, 1997 and 2005, indicating the global nature of the connection between solar disturbance and the lower atmosphere. It was observed that very large swings in 27 day temperature components are often correlated with 27 day variation in solar activity.
[ { "created": "Wed, 22 Jan 2014 07:30:33 GMT", "version": "v1" } ]
2014-01-24
[ [ "Edmonds", "Ian", "" ] ]
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1401.6011
Michael Sagraloff
Michael Sagraloff
A Near-Optimal Algorithm for Computing Real Roots of Sparse Polynomials
null
null
null
null
cs.NA cs.CC cs.SC math.NA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let $p\in\mathbb{Z}[x]$ be an arbitrary polynomial of degree $n$ with $k$ non-zero integer coefficients of absolute value less than $2^\tau$. In this paper, we answer the open question whether the real roots of $p$ can be computed with a number of arithmetic operations over the rational numbers that is polynomial in the input size of the sparse representation of $p$. More precisely, we give a deterministic, complete, and certified algorithm that determines isolating intervals for all real roots of $p$ with $O(k^3\cdot\log(n\tau)\cdot \log n)$ many exact arithmetic operations over the rational numbers. When using approximate but certified arithmetic, the bit complexity of our algorithm is bounded by $\tilde{O}(k^4\cdot n\tau)$, where $\tilde{O}(\cdot)$ means that we ignore logarithmic. Hence, for sufficiently sparse polynomials (i.e. $k=O(\log^c (n\tau))$ for a positive constant $c$), the bit complexity is $\tilde{O}(n\tau)$. We also prove that the latter bound is optimal up to logarithmic factors.
[ { "created": "Thu, 23 Jan 2014 15:43:06 GMT", "version": "v1" } ]
2014-01-24
[ [ "Sagraloff", "Michael", "" ] ]
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1401.6013
Linhao Li
Linhao Li, Ping Wang, Qinghua Hu and Sijia Cai
Efficient Background Modeling Based on Sparse Representation and Outlier Iterative Removal
12pages, 10figures
null
10.1109/TCSVT.2014.2380195
null
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Background modeling is a critical component for various vision-based applications. Most traditional methods tend to be inefficient when solving large-scale problems. In this paper, we introduce sparse representation into the task of large scale stable background modeling, and reduce the video size by exploring its 'discriminative' frames. A cyclic iteration process is then proposed to extract the background from the discriminative frame set. The two parts combine to form our Sparse Outlier Iterative Removal (SOIR) algorithm. The algorithm operates in tensor space to obey the natural data structure of videos. Experimental results show that a few discriminative frames determine the performance of the background extraction. Further, SOIR can achieve high accuracy and high speed simultaneously when dealing with real video sequences. Thus, SOIR has an advantage in solving large-scale tasks.
[ { "created": "Thu, 23 Jan 2014 15:44:48 GMT", "version": "v1" }, { "created": "Tue, 5 Jan 2016 07:59:54 GMT", "version": "v2" } ]
2016-01-06
[ [ "Li", "Linhao", "" ], [ "Wang", "Ping", "" ], [ "Hu", "Qinghua", "" ], [ "Cai", "Sijia", "" ] ]
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1401.6015
Parisa Jalili Marandi
Parisa Jalili Marandi, Marco Primi, Nicolas Schiper, Fernando Pedone
Ring Paxos: High-Throughput Atomic Broadcast
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null
null
null
cs.DC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Atomic broadcast is an important communication primitive often used to implement state-machine replication. Despite the large number of atomic broadcast algorithms proposed in the literature, few papers have discussed how to turn these algorithms into efficient executable protocols. This paper focuses on a class of atomic broadcast algorithms based on Paxos, with its corresponding desirable properties: safety under asynchrony assumptions, liveness under weak synchrony assumptions, and resiliency-optimality. The paper presents two protocols, M-Ring Paxos and U-Ring Paxos, derived from Paxos. The protocols inherit the properties of Paxos and can be implemented very efficiently. We report a detailed performance analysis of M-Ring Paxos and U-Ring Paxos and compare them to other atomic broadcast protocols.
[ { "created": "Thu, 23 Jan 2014 15:49:17 GMT", "version": "v1" } ]
2014-01-24
[ [ "Marandi", "Parisa Jalili", "" ], [ "Primi", "Marco", "" ], [ "Schiper", "Nicolas", "" ], [ "Pedone", "Fernando", "" ] ]
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1401.6020
Ghassem Tofighi
Ghassem Tofighi, Kaamran Raahemifar, Anastasios N. Venetsanopoulos
A Brief Review on Models for Performance Evaluation in DSS Architecture
Find it online here: http://www.jscse.com/papers/?vol=3&no=3&n=68
null
10.7321/jscse.v3.n3.68
null
cs.PF cs.SE
http://creativecommons.org/licenses/by/3.0/
Distributed Software Systems are used these days by many people in the real time operations and modern enterprise applications. One of the most important and essential attributes of measurements for the quality of service of distributed software is performance. Performance models can be employed at early stages of the software development cycle to characterize the quantitative behavior of software systems. In this research, performance models based on fuzzy logic approach, queuing network approach and Petri net approach have been reviewed briefly. One of the most common ways in performance analysis of distributed software systems is translating the UML diagrams to mathematical modeling languages for the description of distributed systems such as queuing networks or Petri nets. In this paper, some of these approaches are reviewed briefly. Attributes which are used for performance modeling in the literature are mostly machine based. On the other hand, end users and client parameters for performance evaluation are not covered extensively. In this way, future research could be based on developing hybrid models to capture user decision variables which make system performance evaluation more user driven.
[ { "created": "Thu, 23 Jan 2014 15:51:32 GMT", "version": "v1" } ]
2014-01-25
[ [ "Tofighi", "Ghassem", "" ], [ "Raahemifar", "Kaamran", "" ], [ "Venetsanopoulos", "Anastasios N.", "" ] ]
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1401.6021
Piero Olla
Piero Olla
Pros and cons of swimming in a noisy environment
13 pages 4 figures
Phys. Rev. E Vol 89, 032136 (2014)
10.1103/PhysRevE.89.032136
null
cond-mat.stat-mech cond-mat.soft physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The problem of optimal microscopic swimming in a noisy environment is analyzed. A simplified model in which propulsion is generated by the relative motion of three spheres connected by immaterial links has been considered. We show that an optimized noisy microswimmer requires less power for propulsion (on the average), than an optimal noiseless counterpart, migrating with identical mean velocity and swimming stroke amplitude. We also show that noise can be used to overcome some of the limitations of the scallop theorem, and have a swimmer that is able to propel itself with control over just one degree of freedom.
[ { "created": "Thu, 23 Jan 2014 15:54:18 GMT", "version": "v1" }, { "created": "Fri, 28 Mar 2014 17:33:31 GMT", "version": "v2" } ]
2015-06-18
[ [ "Olla", "Piero", "" ] ]
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1401.6022
Rishab Nithyanand
Xiang Cai, Rishab Nithyanand, and Rob Johnson
New Approaches to Website Fingerprinting Defenses
null
null
null
null
cs.CR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Website fingerprinting attacks enable an adversary to infer which website a victim is visiting, even if the victim uses an encrypting proxy, such as Tor. Previous work has shown that all proposed defenses against website fingerprinting attacks are ineffective. This paper advances the study of website fingerprinting attacks and defenses in two ways. First, we develop bounds on the trade-off between security and bandwidth overhead that any fingerprinting defense scheme can achieve. This enables us to compare schemes with different security/overhead trade-offs by comparing how close they are to the lower bound. We then refine, implement, and evaluate the Congestion Sensitive BuFLO scheme outlined by Cai, et al. CS-BuFLO, which is based on the provably-secure BuFLO defense proposed by Dyer, et al., was not fully-specified by Cai, et al, but has nonetheless attracted the attention of the Tor developers. Our experiments find that CS-BuFLO has high overhead (around 2.3-2.8x) but can get 6x closer to the bandwidth/security trade-off lower bound than Tor or plain SSH.
[ { "created": "Thu, 23 Jan 2014 15:55:20 GMT", "version": "v1" } ]
2014-01-24
[ [ "Cai", "Xiang", "" ], [ "Nithyanand", "Rishab", "" ], [ "Johnson", "Rob", "" ] ]
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1401.6023
Si-Hyeon Lee
Si-Hyeon Lee and Sae-Young Chung
A Unified Approach for Network Information Theory
52 pages, 7 figures, submitted to IEEE Transactions on Information theory, a shorter version will appear in Proc. IEEE ISIT 2015
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we take a unified approach for network information theory and prove a coding theorem, which can recover most of the achievability results in network information theory that are based on random coding. The final single-letter expression has a very simple form, which was made possible by many novel elements such as a unified framework that represents various network problems in a simple and unified way, a unified coding strategy that consists of a few basic ingredients but can emulate many known coding techniques if needed, and new proof techniques beyond the use of standard covering and packing lemmas. For example, in our framework, sources, channels, states and side information are treated in a unified way and various constraints such as cost and distortion constraints are unified as a single joint-typicality constraint. Our theorem can be useful in proving many new achievability results easily and in some cases gives simpler rate expressions than those obtained using conventional approaches. Furthermore, our unified coding can strictly outperform existing schemes. For example, we obtain a generalized decode-compress-amplify-and-forward bound as a simple corollary of our main theorem and show it strictly outperforms previously known coding schemes. Using our unified framework, we formally define and characterize three types of network duality based on channel input-output reversal and network flow reversal combined with packing-covering duality.
[ { "created": "Thu, 23 Jan 2014 16:00:24 GMT", "version": "v1" }, { "created": "Tue, 28 Jan 2014 11:56:49 GMT", "version": "v2" }, { "created": "Thu, 21 May 2015 17:20:34 GMT", "version": "v3" } ]
2015-05-22
[ [ "Lee", "Si-Hyeon", "" ], [ "Chung", "Sae-Young", "" ] ]
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1401.6024
Martin Slawski
Martin Slawski, Matthias Hein, Pavlo Lutsik
Matrix factorization with Binary Components
appeared in NIPS 2013
null
null
null
stat.ML cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Motivated by an application in computational biology, we consider low-rank matrix factorization with $\{0,1\}$-constraints on one of the factors and optionally convex constraints on the second one. In addition to the non-convexity shared with other matrix factorization schemes, our problem is further complicated by a combinatorial constraint set of size $2^{m \cdot r}$, where $m$ is the dimension of the data points and $r$ the rank of the factorization. Despite apparent intractability, we provide - in the line of recent work on non-negative matrix factorization by Arora et al. (2012) - an algorithm that provably recovers the underlying factorization in the exact case with $O(m r 2^r + mnr + r^2 n)$ operations for $n$ datapoints. To obtain this result, we use theory around the Littlewood-Offord lemma from combinatorics.
[ { "created": "Thu, 23 Jan 2014 16:02:19 GMT", "version": "v1" } ]
2014-01-24
[ [ "Slawski", "Martin", "" ], [ "Hein", "Matthias", "" ], [ "Lutsik", "Pavlo", "" ] ]
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1401.6025
Irene M\'arquez-Corbella
Alain Couvreur, Irene M\'arquez-Corbella and Ruud Pellikaan
Cryptanalysis of McEliece Cryptosystem Based on Algebraic Geometry Codes and their subcodes
A part of the material of this article has been published at the conferences ISIT 2014 with title "A polynomial time attack against AG code based PKC" and 4ICMCTA with title "Crypt. of PKC that use subcodes of AG codes". This long version includes detailed proofs and new results: the proceedings articles only considered the reconstruction of ECP while we discuss here the reconstruction of ECA
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cs.IT math.AG math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We give polynomial time attacks on the McEliece public key cryptosystem based either on algebraic geometry (AG) codes or on small codimensional subcodes of AG codes. These attacks consist in the blind reconstruction either of an Error Correcting Pair (ECP), or an Error Correcting Array (ECA) from the single data of an arbitrary generator matrix of a code. An ECP provides a decoding algorithm that corrects up to $\frac{d^*-1-g}{2}$ errors, where $d^*$ denotes the designed distance and $g$ denotes the genus of the corresponding curve, while with an ECA the decoding algorithm corrects up to $\frac{d^*-1}{2}$ errors. Roughly speaking, for a public code of length $n$ over $\mathbb F_q$, these attacks run in $O(n^4\log (n))$ operations in $\mathbb F_q$ for the reconstruction of an ECP and $O(n^5)$ operations for the reconstruction of an ECA. A probabilistic shortcut allows to reduce the complexities respectively to $O(n^{3+\varepsilon} \log (n))$ and $O(n^{4+\varepsilon})$. Compared to the previous known attack due to Faure and Minder, our attack is efficient on codes from curves of arbitrary genus. Furthermore, we investigate how far these methods apply to subcodes of AG codes.
[ { "created": "Thu, 23 Jan 2014 16:02:44 GMT", "version": "v1" }, { "created": "Mon, 29 Feb 2016 18:48:25 GMT", "version": "v2" }, { "created": "Sat, 3 Jun 2017 11:02:01 GMT", "version": "v3" } ]
2017-06-06
[ [ "Couvreur", "Alain", "" ], [ "Márquez-Corbella", "Irene", "" ], [ "Pellikaan", "Ruud", "" ] ]
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1401.6030
Sergey Sysoev
Sergey Sysoev
The Effective Solving of the Tasks from NP by a Quantum Computer
The paper is submitted to the IEEE Transactions on Information Theory journal
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null
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cs.CC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The new model of quantum computation is proposed, for which an effective algorithm of solving any task in NP is described. The work is based and inspired be the Grover's algorithm for solving NP-tasks with quadratic speedup compared to the classical computation model. The provided model and algorithm exhibit the exponential speedup over that described by Grover.
[ { "created": "Thu, 23 Jan 2014 16:10:16 GMT", "version": "v1" }, { "created": "Tue, 9 Dec 2014 14:35:41 GMT", "version": "v2" } ]
2014-12-10
[ [ "Sysoev", "Sergey", "" ] ]
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1401.6031
Nikolay Alekseechkin
Nikolay V. Alekseechkin
Multivariable theory of droplet nucleation in a single-component vapor
36 pages, 7 figures
null
10.1016/j.physa.2014.06.050
null
physics.chem-ph cond-mat.soft
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The multivariable theory of nucleation [N. V. Alekseechkin, J. Chem. Phys. 124, 124512 (2006)] is applied to the droplet nucleation in a supersaturated single-component vapor; the droplet volume V, temperature T, and volume change rate U=V_dot are the variables of the theory. A new approach based on macroscopic kinetics is developed for the droplet evolution and results in the derived equations for U_dot, V_dot, and T_dot. It is shown that there is no the viscosity effect in the employed ideal gas approximation, so the variable U can be omitted. The nonisothermal effect (the discrepancy between the actual and isothermal nucleation rates) earlier studied numerically is analytically examined here. The calculated steady state distribution function of droplets shows their average overheating relatively the vapor temperature. An inert background gas is shown to diminish the nonisothermal effect in comparison with a pure vapor case.
[ { "created": "Thu, 23 Jan 2014 16:10:19 GMT", "version": "v1" }, { "created": "Tue, 28 Jan 2014 22:12:57 GMT", "version": "v2" } ]
2015-06-18
[ [ "Alekseechkin", "Nikolay V.", "" ] ]
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1401.6036
Martino Borello
Martino Borello and Gabriele Nebe
On involutions in extremal self-dual codes and the dual distance of semi self-dual codes
12 pages
null
null
null
math.CO cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A classical result of Conway and Pless is that a natural projection of the fixed code of an automorphism of odd prime order of a self-dual binary linear code is self-dual. In this paper we prove that the same holds for involutions under some (quite strong) conditions on the codes. In order to prove it, we introduce a new family of binary codes: the semi self-dual codes. A binary self-orthogonal code is called semi self-dual if it contains the all-ones vector and is of codimension 2 in its dual code. We prove upper bounds on the dual distance of semi self-dual codes. As an application we get the following: let C be an extremal self-dual binary linear code of length 24m and s in Aut(C) be a fixed point free automorphism of order 2. If m is odd or if m=2k with binom{5k-1}{k-1} odd then C is a free F_2<s>-module. This result has quite strong consequences on the structure of the automorphism group of such codes.
[ { "created": "Thu, 23 Jan 2014 16:22:42 GMT", "version": "v1" }, { "created": "Mon, 24 Nov 2014 11:14:10 GMT", "version": "v2" } ]
2014-11-25
[ [ "Borello", "Martino", "" ], [ "Nebe", "Gabriele", "" ] ]
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1401.6039
Marco Dalai
Marco Dalai and Andreas Winter
Constant Compositions in the Sphere Packing Bound for Classical-Quantum Channels
ISIT 2014. Two issues that were left open in Section IV of the first version are now solved
Proc. ISIT 2014, pp. 151-155
10.1109/ISIT.2014.6874813
null
cs.IT math.IT quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The sphere packing bound, in the form given by Shannon, Gallager and Berlekamp, was recently extended to classical-quantum channels, and it was shown that this creates a natural setting for combining probabilistic approaches with some combinatorial ones such as the Lov\'asz theta function. In this paper, we extend the study to the case of constant composition codes. We first extend the sphere packing bound for classical-quantum channels to this case, and we then show that the obtained result is related to a variation of the Lov\'asz theta function studied by Marton. We then propose a further extension to the case of varying channels and codewords with a constant conditional composition given a particular sequence. This extension is then applied to auxiliary channels to deduce a bound which can be interpreted as an extension of the Elias bound.
[ { "created": "Thu, 23 Jan 2014 16:31:18 GMT", "version": "v1" }, { "created": "Mon, 28 Apr 2014 14:20:52 GMT", "version": "v2" } ]
2014-12-02
[ [ "Dalai", "Marco", "" ], [ "Winter", "Andreas", "" ] ]
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1401.6041
Jos\'e Antonio P\'erez-Hern\'andez
M. F. Ciappina, J. A. P\'erez-Hern\'andez, T. Shaaran, and M. Lewenstein
Coherent XUV generation driven by sharp metal tips photoemission
arXiv admin note: substantial text overlap with arXiv:1309.0349
null
10.1140/epjd/e2014-50060-4
null
physics.optics physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
It was already experimentally demonstrated that high-energy electrons can be generated using metal nanotips as active media. In addition, it has been theoretically proven that the high-energy tail of the photoemitted electrons is intrinsically linked to the recollision phenomenon. Through this recollision process it is also possible to convert the energy gained by the laser-emitted electron in the continuum in a coherent XUV photon. It means the emission of harmonic radiation appears to be feasible, although it has not been experimentally demonstrated hitherto till now. In this paper, we employ a quantum mechanical approach to model the electron dipole moment including both the laser experimental conditions and the bulk matter properties and predict is possible to generate coherent UV and XUV radiation using metal nanotips as sources. Our quantum mechanical results are fully supported by their classical counterparts.
[ { "created": "Thu, 23 Jan 2014 16:36:52 GMT", "version": "v1" } ]
2015-06-18
[ [ "Ciappina", "M. F.", "" ], [ "Pérez-Hernández", "J. A.", "" ], [ "Shaaran", "T.", "" ], [ "Lewenstein", "M.", "" ] ]
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1401.6046
Shulabh Gupta
T. Paradis, S. Gupta, Q. Zhang, L. J. Jiang, and C. Caloz
Hybrid-cascade Coupled-Line Phasers for High-resolution Radio-Analog Signal Processing
2 pages, 5 figures
null
null
null
physics.ins-det physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A hybrid-cascade (HC) coupled-line phaser configuration is presented to synthesize enhanced group delay responses for high-resolution Radio-Analog Signal Processing (R-ASP). Using exact analytical transfer functions, the superiority of HC coupled-line phasers over conventional transversally cascaded C-section phasers is demonstrated and verified using full-wave simulations.
[ { "created": "Tue, 14 Jan 2014 04:50:43 GMT", "version": "v1" } ]
2014-01-24
[ [ "Paradis", "T.", "" ], [ "Gupta", "S.", "" ], [ "Zhang", "Q.", "" ], [ "Jiang", "L. J.", "" ], [ "Caloz", "C.", "" ] ]
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1401.6047
Dmitri Priimak
Dmitri Priimak
Finite difference numerical method for the superlattice Boltzmann transport equation and case comparison of CPU(C) and GPU(CUDA) implementations
14 pages, 6 figures
null
10.1016/j.jcp.2014.08.028
null
physics.comp-ph cond-mat.mtrl-sci
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a finite difference numerical algorithm for solving two dimensional spatially homogeneous Boltzmann transport equation which describes electron transport in a semiconductor superlattice subject to crossed time dependent electric and constant magnetic fields. The algorithm is implemented both in C language targeted to CPU and in CUDA C language targeted to commodity NVidia GPU. We compare performances and merits of one implementation versus another and discuss various software optimization techniques.
[ { "created": "Thu, 23 Jan 2014 16:43:42 GMT", "version": "v1" }, { "created": "Tue, 18 Mar 2014 17:15:51 GMT", "version": "v2" }, { "created": "Mon, 21 Jul 2014 20:00:41 GMT", "version": "v3" } ]
2015-06-18
[ [ "Priimak", "Dmitri", "" ] ]
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1401.6048
Ronen I. Brafman
Ronen I. Brafman, Guy Shani
Replanning in Domains with Partial Information and Sensing Actions
null
Journal Of Artificial Intelligence Research, Volume 45, pages 565-600, 2012
10.1613/jair.3711
null
cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Replanning via determinization is a recent, popular approach for online planning in MDPs. In this paper we adapt this idea to classical, non-stochastic domains with partial information and sensing actions, presenting a new planner: SDR (Sample, Determinize, Replan). At each step we generate a solution plan to a classical planning problem induced by the original problem. We execute this plan as long as it is safe to do so. When this is no longer the case, we replan. The classical planning problem we generate is based on the translation-based approach for conformant planning introduced by Palacios and Geffner. The state of the classical planning problem generated in this approach captures the belief state of the agent in the original problem. Unfortunately, when this method is applied to planning problems with sensing, it yields a non-deterministic planning problem that is typically very large. Our main contribution is the introduction of state sampling techniques for overcoming these two problems. In addition, we introduce a novel, lazy, regression-based method for querying the agents belief state during run-time. We provide a comprehensive experimental evaluation of the planner, showing that it scales better than the state-of-the-art CLG planner on existing benchmark problems, but also highlighting its weaknesses with new domains. We also discuss its theoretical guarantees.
[ { "created": "Thu, 23 Jan 2014 16:44:51 GMT", "version": "v1" } ]
2014-01-24
[ [ "Brafman", "Ronen I.", "" ], [ "Shani", "Guy", "" ] ]
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1401.6049
Richard Hoshino
Richard Hoshino, Ken-ichi Kawarabayashi
Generating Approximate Solutions to the TTP using a Linear Distance Relaxation
null
Journal Of Artificial Intelligence Research, Volume 45, pages 257-286, 2012
10.1613/jair.3713
null
cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In some domestic professional sports leagues, the home stadiums are located in cities connected by a common train line running in one direction. For these instances, we can incorporate this geographical information to determine optimal or nearly-optimal solutions to the n-team Traveling Tournament Problem (TTP), an NP-hard sports scheduling problem whose solution is a double round-robin tournament schedule that minimizes the sum total of distances traveled by all n teams. We introduce the Linear Distance Traveling Tournament Problem (LD-TTP), and solve it for n=4 and n=6, generating the complete set of possible solutions through elementary combinatorial techniques. For larger n, we propose a novel "expander construction" that generates an approximate solution to the LD-TTP. For n congruent to 4 modulo 6, we show that our expander construction produces a feasible double round-robin tournament schedule whose total distance is guaranteed to be no worse than 4/3 times the optimal solution, regardless of where the n teams are located. This 4/3-approximation for the LD-TTP is stronger than the currently best-known ratio of 5/3 + epsilon for the general TTP. We conclude the paper by applying this linear distance relaxation to general (non-linear) n-team TTP instances, where we develop fast approximate solutions by simply "assuming" the n teams lie on a straight line and solving the modified problem. We show that this technique surprisingly generates the distance-optimal tournament on all benchmark sets on 6 teams, as well as close-to-optimal schedules for larger n, even when the teams are located around a circle or positioned in three-dimensional space.
[ { "created": "Thu, 23 Jan 2014 16:45:07 GMT", "version": "v1" } ]
2014-01-24
[ [ "Hoshino", "Richard", "" ], [ "Kawarabayashi", "Ken-ichi", "" ] ]
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1401.6050
Hai Zhao
Hai Zhao, Xiaotian Zhang, Chunyu Kit
Integrative Semantic Dependency Parsing via Efficient Large-scale Feature Selection
null
Journal Of Artificial Intelligence Research, Volume 46, pages 203-233, 2013
10.1613/jair.3717
null
cs.CL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Semantic parsing, i.e., the automatic derivation of meaning representation such as an instantiated predicate-argument structure for a sentence, plays a critical role in deep processing of natural language. Unlike all other top systems of semantic dependency parsing that have to rely on a pipeline framework to chain up a series of submodels each specialized for a specific subtask, the one presented in this article integrates everything into one model, in hopes of achieving desirable integrity and practicality for real applications while maintaining a competitive performance. This integrative approach tackles semantic parsing as a word pair classification problem using a maximum entropy classifier. We leverage adaptive pruning of argument candidates and large-scale feature selection engineering to allow the largest feature space ever in use so far in this field, it achieves a state-of-the-art performance on the evaluation data set for CoNLL-2008 shared task, on top of all but one top pipeline system, confirming its feasibility and effectiveness.
[ { "created": "Thu, 23 Jan 2014 16:45:39 GMT", "version": "v1" } ]
2014-01-25
[ [ "Zhao", "Hai", "" ], [ "Zhang", "Xiaotian", "" ], [ "Kit", "Chunyu", "" ] ]
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1401.6053
Ebrahim Nasrabadi
Ebrahim Nasrabadi and Ronald Koch
Flows over time in time-varying networks
null
null
null
null
cs.SY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
There has been much research on network flows over time due to their important role in real world applications. This has led to many results, but the more challenging continuous time model still lacks some of the key concepts and techniques that are the cornerstones of static network flows. The aim of this paper is to advance the state of the art for dynamic network flows by developing the continuous time analogues of the theory for static network flows. Specifically, we make use of ideas from the static case to establish a reduced cost optimality condition, a negative cycle optimality condition, and a strong duality result for a very general class of network flows over time.
[ { "created": "Thu, 23 Jan 2014 16:59:40 GMT", "version": "v1" } ]
2014-01-24
[ [ "Nasrabadi", "Ebrahim", "" ], [ "Koch", "Ronald", "" ] ]
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1401.6054
Max Alekseyev
Max A. Alekseyev
Computing the inverses, their power sums, and extrema for Euler's totient and other multiplicative functions
null
Journal of Integer Sequences 19 (2016), Article 16.5.2
null
null
cs.DM cs.DS math.NT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose a generic algorithm for computing the inverses of a multiplicative function under the assumption that the set of inverses is finite. More generally, our algorithm can compute certain functions of the inverses, such as their power sums (e.g., cardinality) or extrema, without direct enumeration of the inverses. We illustrate our algorithm with Euler's totient function $\varphi(\cdot)$ and the $k$-th power sum of divisors $\sigma_k(\cdot)$. For example, we can establish that the number of solutions to $\sigma_1(x) = 10^{1000}$ is 15,512,215,160,488,452,125,793,724,066,873,737,608,071,476, while it is intractable to iterate over the actual solutions.
[ { "created": "Thu, 23 Jan 2014 17:03:45 GMT", "version": "v1" }, { "created": "Sat, 19 Apr 2014 00:42:49 GMT", "version": "v2" }, { "created": "Tue, 17 May 2016 14:20:06 GMT", "version": "v3" } ]
2016-05-18
[ [ "Alekseyev", "Max A.", "" ] ]
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1401.6056
Philipp Schneeweiss
Sigrid Holleis and Thomas Hoinkes and Christian Wuttke and Philipp Schneeweiss and Arno Rauschenbeutel
Experimental stress-strain analysis of tapered silica optical fibers with nanofiber waist
null
Appl. Phys. Lett. 104, 163109 (2014)
10.1063/1.4873339
null
physics.class-ph physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We experimentally determine tensile force-elongation diagrams of tapered optical fibers with a nanofiber waist. The tapered optical fibers are produced from standard silica optical fibers using a heat and pull process. Both, the force-elongation data and scanning electron microscope images of the rupture points indicate a brittle material. Despite the small waist radii of only a few hundred nanometers, our experimental data can be fully explained by a nonlinear stress-strain model that relies on material properties of macroscopic silica optical fibers. This is an important asset when it comes to designing miniaturized optical elements as one can rely on the well-founded material characteristics of standard optical fibers. Based on this understanding, we demonstrate a simple and non-destructive technique that allows us to determine the waist radius of the tapered optical fiber. We find excellent agreement with independent scanning electron microscope measurements of the waist radius.
[ { "created": "Thu, 23 Jan 2014 17:11:31 GMT", "version": "v1" } ]
2014-04-29
[ [ "Holleis", "Sigrid", "" ], [ "Hoinkes", "Thomas", "" ], [ "Wuttke", "Christian", "" ], [ "Schneeweiss", "Philipp", "" ], [ "Rauschenbeutel", "Arno", "" ] ]
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1401.6058
James RA Davenport
James R. A. Davenport and Robert DeLine
The Readability of Tweets and their Geographic Correlation with Education
4 page note
null
null
null
cs.SI physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Twitter has rapidly emerged as one of the largest worldwide venues for written communication. Thanks to the ease with which vast quantities of tweets can be mined, Twitter has also become a source for studying modern linguistic style. The readability of text has long provided a simple method to characterize the complexity of language and ease that documents may be understood by readers. In this note we use a modified version of the Flesch Reading Ease formula, applied to a corpus of 17.4 million tweets. We find tweets have characteristically more difficult readability scores compared to other short format communication, such as SMS or chat. This linguistic difference is insensitive to the presence of "hashtags" within tweets. By utilizing geographic data provided by 2% of users, joined with "ZIP Code Tabulation Area" (ZCTA) level education data from the U.S. Census, we find an intriguing correlation between the average readability and the college graduation rate within a ZCTA. This points towards a difference in either the underlying language, or a change in the type of content being tweeted in these areas
[ { "created": "Thu, 23 Jan 2014 17:15:56 GMT", "version": "v1" } ]
2014-01-24
[ [ "Davenport", "James R. A.", "" ], [ "DeLine", "Robert", "" ] ]
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1401.6059
Manuel A. Matias
P. Parra-Rivas, D. Gomila, M. A. Matias, S. Coen, and L. Gelens
Dynamics of localized and patterned structures in the Lugiato-Lefever equation determine the stability and shape of optical frequency combs
13 pages, 13 figures, under review with PRA (since October 2013)
Phys. Rev. A 89, 043813 (2014)
10.1103/PhysRevA.89.043813
null
physics.optics nlin.PS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
It has been recently uncovered that coherent structures in microresonators such as cavity solitons and patterns are intimately related to Kerr frequency combs. In this work, we present a general analysis of the regions of existence and stability of cavity solitons and patterns in the Lugiato-Lefever equation, a mean-field model that finds applications in many different nonlinear optical cavities. We demonstrate that the rich dynamics and coexistence of multiple solutions in the Lugiato-Lefever equation are of key importance to understanding frequency comb generation. A detailed map of how and where to target stable Kerr frequency combs in the parameter space defined by the frequency detuning and the pump power is provided. Moreover, the work presented also includes the organization of various dynamical regimes in terms of bifurcation points of higher co-dimension in regions of parameter space that were previously unexplored in the Lugiato-Lefever equation. We discuss different dynamical instabilities such as oscillations and chaotic regimes.
[ { "created": "Thu, 23 Jan 2014 17:19:23 GMT", "version": "v1" } ]
2014-05-28
[ [ "Parra-Rivas", "P.", "" ], [ "Gomila", "D.", "" ], [ "Matias", "M. A.", "" ], [ "Coen", "S.", "" ], [ "Gelens", "L.", "" ] ]
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1401.6060
Marco Mondelli
Marco Mondelli, S. Hamed Hassani, Igal Sason, and R\"udiger Urbanke
Achieving Marton's Region for Broadcast Channels Using Polar Codes
26 pages, 11 figures, accepted to IEEE Trans. Inform. Theory and presented in part at ISIT'14
null
10.1109/ISIT.2014.6874844
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper presents polar coding schemes for the 2-user discrete memoryless broadcast channel (DM-BC) which achieve Marton's region with both common and private messages. This is the best achievable rate region known to date, and it is tight for all classes of 2-user DM-BCs whose capacity regions are known. To accomplish this task, we first construct polar codes for both the superposition as well as the binning strategy. By combining these two schemes, we obtain Marton's region with private messages only. Finally, we show how to handle the case of common information. The proposed coding schemes possess the usual advantages of polar codes, i.e., they have low encoding and decoding complexity and a super-polynomial decay rate of the error probability. We follow the lead of Goela, Abbe, and Gastpar, who recently introduced polar codes emulating the superposition and binning schemes. In order to align the polar indices, for both schemes, their solution involves some degradedness constraints that are assumed to hold between the auxiliary random variables and the channel outputs. To remove these constraints, we consider the transmission of $k$ blocks and employ a chaining construction that guarantees the proper alignment of the polarized indices. The techniques described in this work are quite general, and they can be adopted to many other multi-terminal scenarios whenever there polar indices need to be aligned.
[ { "created": "Thu, 23 Jan 2014 17:23:38 GMT", "version": "v1" }, { "created": "Thu, 20 Feb 2014 17:09:15 GMT", "version": "v2" }, { "created": "Fri, 10 Oct 2014 18:29:05 GMT", "version": "v3" } ]
2016-11-15
[ [ "Mondelli", "Marco", "" ], [ "Hassani", "S. Hamed", "" ], [ "Sason", "Igal", "" ], [ "Urbanke", "Rüdiger", "" ] ]
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1401.6063
Gisbert Jan{\ss}en
Holger Boche and Gisbert Jan{\ss}en
Resource cost results for one-way entanglement distillation and state merging of compound and arbitrarily varying quantum sources
Improved presentation. Close to the published version. Results unchanged. 25 pages, 0 figures
J. Math. Phys. 55, 082208 (2014)
10.1063/1.4893635
null
quant-ph cs.IT math-ph math.IT math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider one-way quantum state merging and entanglement distillation under compound and arbitrarily varying source models. Regarding quantum compound sources, where the source is memoryless, but the source state an unknown member of a certain set of density matrices, we continue investigations begun in the work of Bjelakovi\'c et. al. [Universal quantum state merging, J. Math. Phys. 54, 032204 (2013)] and determine the classical as well as entanglement cost of state merging. We further investigate quantum state merging and entanglement distillation protocols for arbitrarily varying quantum sources (AVQS). In the AVQS model, the source state is assumed to vary in an arbitrary manner for each source output due to environmental fluctuations or adversarial manipulation. We determine the one-way entanglement distillation capacity for AVQS, where we invoke the famous robustification and elimination techniques introduced by R. Ahlswede. Regarding quantum state merging for AVQS we show by example, that the robustification and elimination based approach generally leads to suboptimal entanglement as well as classical communication rates.
[ { "created": "Thu, 23 Jan 2014 17:26:21 GMT", "version": "v1" }, { "created": "Wed, 19 Feb 2014 15:19:21 GMT", "version": "v2" }, { "created": "Tue, 26 Aug 2014 14:47:41 GMT", "version": "v3" } ]
2014-08-27
[ [ "Boche", "Holger", "" ], [ "Janßen", "Gisbert", "" ] ]
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1401.6066
Loic Rolland
Virgo collaboration : T. Accadia, F. Acernese, M. Agathos, A. Allocca, P. Astone, G. Ballardin, F. Barone, M. Barsuglia, A. Basti, Th. S. Bauer, M. Bejger, M .G. Beker, C. Belczynski, D. Bersanetti, A. Bertolini, M. Bitossi, M. A. Bizouard, M. Blom, M. Boer, F. Bondu, L. Bonelli, R. Bonnand, V. Boschi, L. Bosi, C. Bradaschia, M. Branchesi, T. Briant, A. Brillet, V. Brisson, T. Bulik, H. J. Bulten, D. Buskulic, C. Buy, G. Cagnoli, E. Calloni, B. Canuel, F. Carbognani, F. Cavalier, R. Cavalieri, G. Cella, E. Cesarini, E. Chassande-Mottin, A. Chincarini, A. Chiummo, F. Cleva, E. Coccia, P.-F. Cohadon, A. Colla, M. Colombini, A. Conte, J.-P. Coulon, E. Cuoco, S. D'Antonio, V. Dattilo, M. Davier, R. Day, G. Debreczeni, J. Degallaix, S. Del\'eglise, W. Del Pozzo, H. Dereli, R. De Rosa, L. Di Fiore, A. Di Lieto, A. Di Virgilio, M. Drago, G. Endr\H{o}czi, V. Fafone, S. Farinon, I. Ferrante, F. Ferrini, F. Fidecaro, I. Fiori, R. Flaminio, J.-D. Fournier, S. Franco, S. Frasca, F. Frasconi, L. Gammaitoni, F. Garufi, G. Gemme, E. Genin, A. Gennai, A. Giazotto, R. Gouaty, M. Granata, P. Groot, G. M. Guidi, A. Heidmann, H. Heitmann, P. Hello, G. Hemming, P. Jaranowski, R.J.G. Jonker, M. Kasprzack, F. K\'ef\'elian, I. Kowalska, A. Kr\'olak, A. Kutynia, C. Lazzaro, M. Leonardi, N. Leroy, N. Letendre, T. G. F. Li, M. Lorenzini, V. Loriette, G. Losurdo, E. Majorana, I. Maksimovic, V. Malvezzi, N. Man, V. Mangano, M. Mantovani, F. Marchesoni, F. Marion, J. Marque, F. Martelli, L. Martinelli, A. Masserot, D. Meacher, J. Meidam, C. Michel, L. Milano, Y. Minenkov, M. Mohan, N. Morgado, B. Mours, M. F. Nagy, I. Nardecchia, L. Naticchioni, G. Nelemans, I. Neri, M. Neri, F. Nocera, C. Palomba, F. Paoletti, R. Paoletti, A. Pasqualetti, R. Passaquieti, D. Passuello, M. Pichot, F. Piergiovanni, L. Pinard, R. Poggiani, M. Prijatelj, G. A. Prodi, M. Punturo, P. Puppo, D. S. Rabeling, I. R\'acz, P. Rapagnani, V. Re, T. Regimbau, F. Ricci, F. Robinet, A. Rocchi, L. Rolland, R. Romano, D. Rosi\'nska, P. Ruggi, E. Saracco, B. Sassolas, D. Sentenac, V. Sequino, S. Shah, K. Siellez, L. Sperandio, N. Straniero, R. Sturani, B. Swinkels, M. Tacca, A. P. M. ter Braack, A. Toncelli, M. Tonelli, O. Torre, F. Travasso, G. Vajente, J. F. J. van den Brand, C. Van Den Broeck, S. van der Putten, M. V. van der Sluys, J. van Heijningen, M. Vas\'uth, G. Vedovato, J. Veitch, D. Verkindt, F. Vetrano, A. Vicer\'e, J.-Y. Vinet, S. Vitale, H. Vocca, L.-W. Wei, M. Yvert, A. Zadro\.zny, J.-P. Zendri
Reconstruction of the gravitational wave signal $h(t)$ during the Virgo science runs and independent validation with a photon calibrator
35 pages, 16 figures. Accepted by CQG
T Accadia et al 2014 Class. Quantum Grav. 31 165013
10.1088/0264-9381/31/16/165013
null
gr-qc physics.ins-det
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Virgo detector is a kilometer-scale interferometer for gravitational wave detection located near Pisa (Italy). About 13 months of data were accumulated during four science runs (VSR1, VSR2, VSR3 and VSR4) between May 2007 and September 2011, with increasing sensitivity. In this paper, the method used to reconstruct, in the range 10 Hz-10 kHz, the gravitational wave strain time series $h(t)$ from the detector signals is described. The standard consistency checks of the reconstruction are discussed and used to estimate the systematic uncertainties of the $h(t)$ signal as a function of frequency. Finally, an independent setup, the photon calibrator, is described and used to validate the reconstructed $h(t)$ signal and the associated uncertainties. The uncertainties of the $h(t)$ time series are estimated to be 8% in amplitude. The uncertainty of the phase of $h(t)$ is 50 mrad at 10 Hz with a frequency dependence following a delay of 8 $\mu$s at high frequency. A bias lower than $4\,\mathrm{\mu s}$ and depending on the sky direction of the GW is also present.
[ { "created": "Thu, 23 Jan 2014 17:38:16 GMT", "version": "v1" }, { "created": "Thu, 3 Jul 2014 11:49:22 GMT", "version": "v2" } ]
2014-08-07
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1401.6069
Luca Barletta
Luca Barletta, Gerhard Kramer
On Continuous-Time White Phase Noise Channels
4 pages, Accepted for presentation. ISIT 2014
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A continuous-time model for the additive white Gaussian noise (AWGN) channel in the presence of white (memoryless) phase noise is proposed and discussed. It is shown that for linear modulation the output of the baud-sampled filter matched to the shaping waveform represents a sufficient statistic. The analysis shows that the phase noise channel has the same information rate as an AWGN channel but with a penalty on the average signal-to-noise ratio, the amount of penalty depending on the phase noise statistic.
[ { "created": "Thu, 23 Jan 2014 17:55:42 GMT", "version": "v1" }, { "created": "Mon, 28 Apr 2014 07:07:30 GMT", "version": "v2" } ]
2014-04-29
[ [ "Barletta", "Luca", "" ], [ "Kramer", "Gerhard", "" ] ]
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1401.6070
Adrian Dumitrescu
Adrian Dumitrescu and Anirban Ghosh and Csaba D. T\'oth
On Fence Patrolling by Mobile Agents
13 pages, 6 figures
null
null
null
cs.DS cs.DM math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Suppose that a fence needs to be protected (perpetually) by $k$ mobile agents with maximum speeds $v_1,\ldots,v_k$ so that no point on the fence is left unattended for more than a given amount of time. The problem is to determine if this requirement can be met, and if so, to design a suitable patrolling schedule for the agents. Alternatively, one would like to find a schedule that minimizes the \emph{idle time}, that is, the longest time interval during which some point is not visited by any agent. We revisit this problem, introduced by Czyzowicz et al.(2011), and discuss several strategies for the cases where the fence is an open and a closed curve, respectively. In particular: (i) we disprove a conjecture by Czyzowicz et al. regarding the optimality of their Algorithm ${\mathcal A_2}$ for unidirectional patrolling of a closed fence; (ii) we present an algorithm with a lower idle time for patrolling an open fence, improving an earlier result of Kawamura and Kobayashi.
[ { "created": "Thu, 23 Jan 2014 17:56:52 GMT", "version": "v1" } ]
2014-01-25
[ [ "Dumitrescu", "Adrian", "" ], [ "Ghosh", "Anirban", "" ], [ "Tóth", "Csaba D.", "" ] ]
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1401.6076
Jan Gieseler
Jan Gieseler, Marko Spasenovic, Lukas Novotny, Romain Quidant
Nonlinear mode-coupling and synchronization of a vacuum-trapped nanoparticle
5 pages, 3 figures
Physical Review Letters,112, 103603 (2014)
10.1103/PhysRevLett.112.103603
null
cond-mat.mes-hall physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the dynamics of a laser-trapped nanoparticle in high vacuum. Using parametric coupling to an external excitation source, the linewidth of the nanoparticle's oscillation can be reduced by three orders of magnitude. We show that the oscillation of the nanoparticle and the excitation source are synchronized, exhibiting a well-defined phase relationship. Furthermore, the external source can be used to controllably drive the nanoparticle into the nonlinear regime, thereby generating strong coupling between the different translational modes of the nanoparticle. Our work contributes to the understanding of the nonlinear dynamics of levitated nanoparticles in high vacuum and paves the way for studies of pattern formation, chaos, and stochastic resonance.
[ { "created": "Thu, 23 Jan 2014 18:14:24 GMT", "version": "v1" } ]
2014-03-14
[ [ "Gieseler", "Jan", "" ], [ "Spasenovic", "Marko", "" ], [ "Novotny", "Lukas", "" ], [ "Quidant", "Romain", "" ] ]
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1401.6097
Mine Alsan Ms
Mine Alsan and Emre Telatar
Polarization as a novel architecture to boost the classical mismatched capacity of B-DMCs
Submitted to ISIT 2014
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We show that the mismatched capacity of binary discrete memoryless channels can be improved by channel combining and splitting via Ar{\i}kan's polar transformations. We also show that the improvement is possible even if the transformed channels are decoded with a mismatched polar decoder.
[ { "created": "Thu, 23 Jan 2014 18:41:36 GMT", "version": "v1" } ]
2014-01-24
[ [ "Alsan", "Mine", "" ], [ "Telatar", "Emre", "" ] ]
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1401.6098
Guohua Wu
Guohua Wu, Huilin Wang, Haifeng Li, Witold Pedrycz, Dishan Qiu, Manhao Ma, Jin Liu
An adaptive Simulated Annealing-based satellite observation scheduling method combined with a dynamic task clustering strategy
23 pages, 5 figures, 4 tables
null
null
null
cs.AI cs.CE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Efficient scheduling is of great significance to rationally make use of scarce satellite resources. Task clustering has been demonstrated to realize an effective strategy to improve the efficiency of satellite scheduling. However, the previous task clustering strategy is static. That is, it is integrated into the scheduling in a two-phase manner rather than in a dynamic fashion, without expressing its full potential in improving the satellite scheduling performance. In this study, we present an adaptive Simulated Annealing based scheduling algorithm aggregated with a dynamic task clustering strategy (or ASA-DTC for short) for satellite observation scheduling problems (SOSPs). First, we develop a formal model for the scheduling of Earth observing satellites. Second, we analyze the related constraints involved in the observation task clustering process. Thirdly, we detail an implementation of the dynamic task clustering strategy and the adaptive Simulated Annealing algorithm. The adaptive Simulated Annealing algorithm is efficient, with the endowment of some sophisticated mechanisms, i.e. adaptive temperature control, tabu-list based revisiting avoidance mechanism, and intelligent combination of neighborhood structures. Finally, we report on experimental simulation studies to demonstrate the competitive performance of ASA-DTC. Moreover, we show that ASA-DTC is especially effective when SOSPs contain a large number of targets or these targets are densely distributed in a certain area.
[ { "created": "Tue, 14 Jan 2014 22:46:27 GMT", "version": "v1" } ]
2014-01-24
[ [ "Wu", "Guohua", "" ], [ "Wang", "Huilin", "" ], [ "Li", "Haifeng", "" ], [ "Pedrycz", "Witold", "" ], [ "Qiu", "Dishan", "" ], [ "Ma", "Manhao", "" ], [ "Liu", "Jin", "" ] ]
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1401.6099
Muhammad Usman
Muhammad Usman
Electronic and Optical Properties of [110]-Tilted InAs/GaAs Quantum Dot Stacks
Accepted for publication in PRB (Rapid Comm.)
Physical Review B, 89, 081302(R), 2014
10.1103/PhysRevB.89.081302
null
cond-mat.mes-hall physics.comp-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Multi-million atom simulations are performed to study stacking-angle ($\theta$) dependent strain profiles, electronic structure, and polarization-resolved optical modes from [110]-tilted quantum dot stacks (QDSs). Our calculations reveal highly asymmetrical biaxial strain distributions for the tilted QDSs that strongly influence the confinements of hole wave functions and thereby control the polarization response. The calculated values of degree of polarizations, in good agreement with the available experimental data, predict a unique property of the tilted QDSs that the isotropic polarization response can be realized from both [110] and [-110] cleaved-edges $-$ a feature inaccessible from the conventional [001]-QDSs. Detailed investigations of polar plots further establish that tilting the QDSs provides an additional knob to fine tune their polarization properties.
[ { "created": "Thu, 23 Jan 2014 18:44:56 GMT", "version": "v1" } ]
2014-03-18
[ [ "Usman", "Muhammad", "" ] ]
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1401.6100
K. Eric Harper
K. Eric Harper and Thijmen de Gooijer
Performance Impact of Lock-Free Algorithms on Multicore Communication APIs
17 pages, 8 figures, 36 references, Embedded World Conference 2013
null
null
null
cs.DC cs.OS cs.PF cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Data race conditions in multi-tasking software applications are prevented by serializing access to shared memory resources, ensuring data consistency and deterministic behavior. Traditionally tasks acquire and release locks to synchronize operations on shared memory. Unfortunately, lock management can add significant processing overhead especially for multicore deployments where tasks on different cores convoy in queues waiting to acquire a lock. Implementing more than one lock introduces the risk of deadlock and using spinlocks constrains which cores a task can run on. The better alternative is to eliminate locks and validate that real-time properties are met, which is not directly considered in many embedded applications. Removing the locks is non-trivial and packaging lock-free algorithms for developers reduces the possibility of concurrency defects. This paper details how a multicore communication API implementation is enhanced to support lock-free messaging and the impact this has on data exchange latency between tasks. Throughput and latency are compared on Windows and Linux between lock-based and lock-free implementations for data exchange of messages, packets, and scalars. A model of the lock-free exchange predicts performance at the system architecture level and provides a stop criterion for the refactoring. The results show that migration from single to multicore hardware architectures degrades lock-based performance, and increases lock-free performance.
[ { "created": "Thu, 9 Jan 2014 00:04:41 GMT", "version": "v1" } ]
2014-01-24
[ [ "Harper", "K. Eric", "" ], [ "de Gooijer", "Thijmen", "" ] ]
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1401.6102
Fernando Almeida Dr.
Fernando Almeida, Jos\'e D. Santos, Jos\'e A. Monteiro
e-commerce business models in the context of web3.0 paradigm
12 pages, International Journal of Advanced Information Technology (IJAIT) Vol. 3, No. 6, December 2013
null
10.5121/ijait.2013.3601
null
cs.CY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Web 3.0 promises to have a significant effect in users and businesses. It will change how people work and play, how companies use information to market and sell their products, as well as operate their businesses. The basic shift occurring in Web 3.0 is from information-centric to knowledge-centric patterns of computing. Web 3.0 will enable people and machines to connect, evolve, share and use knowledge on an unprecedented scale and in new ways that make our experience of the Internet better. Additionally, semantic technologies have the potential to drive significant improvements in capabilities and life cycle economics through cost reductions, improved efficiencies, enhanced effectiveness, and new functionalities that were not possible or economically feasible before. In this paper we look to the semantic web and Web 3.0 technologies as enablers for the creation of value and appearance of new business models. For that, we analyze the role and impact of Web 3.0 in business and we identify nine potential business models, based in direct and undirected revenue sources, which have emerged with the appearance of semantic web technologies.
[ { "created": "Thu, 9 Jan 2014 15:12:19 GMT", "version": "v1" } ]
2014-01-24
[ [ "Almeida", "Fernando", "" ], [ "Santos", "José D.", "" ], [ "Monteiro", "José A.", "" ] ]
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1401.6111
Andrey Tolokonnikov
A. Tolokonnikov
Boundary conditions effects on the ground state of a two-electron atom in a vacuum cavity
8 pages, 10 figures
null
null
null
physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The ground state properties of the two-electron atom with atomic number $Z\geq 2$ in the spherical vacuum cavity with general boundary conditions of "not going out" are studied. It is shown that for certain parameters of the cavity such atom could either decay into the one-electron atom with the same atomic number and an electron or be in stable state with the binding and ionization energies several times bigger than the same energies of the free atom. By analogy with the Wigner-Seitz model of metallic bonding, the possibility of the existence of such effects on the lattice formed by the vacuum cavities filled with the two-electron atoms of the same type is discussed.
[ { "created": "Thu, 23 Jan 2014 18:57:12 GMT", "version": "v1" } ]
2014-01-24
[ [ "Tolokonnikov", "A.", "" ] ]
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1401.6113
Yanqing Wang
Yanqing Wang, Yaowen Liang, Luning Liu, Ying Liu
A Motivation Model of Peer Assessment in Programming Language Learning
12 pages, 2 figures, 3 tables
null
10.1177/0735633115571303
null
cs.CY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Peer assessment is an efficient and effective learning assessment method that has been used widely in diverse fields in higher education. Despite its many benefits, a fundamental problem in peer assessment is that participants lack the motivation to assess others' work faithfully and fairly. Non-consensus is a common challenge that makes the reliability of peer assessment a primary concern in practices. This research proposes a motivation model that uses review deviation and radicalization to identify non-consensus in peer assessment. The proposed model is implemented as a software module in a peer code review system called EduPCR4. EduPCR4 is able to monitor this measure and trigger teacher's arbitration when it detects possible non-consensus. An empirical study conducted in a university-level C programming course showed that the proposed model and its implementation helped to improve the peer assessment practices in many aspects.
[ { "created": "Sat, 18 Jan 2014 05:14:44 GMT", "version": "v1" } ]
2015-06-19
[ [ "Wang", "Yanqing", "" ], [ "Liang", "Yaowen", "" ], [ "Liu", "Luning", "" ], [ "Liu", "Ying", "" ] ]
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1401.6114
Michael E. Peskin
W. A. Barletta, M. Bai, M. Battaglia, O. Bruning, J. Byrd, R. Ent, J. Flanagan, W. Gai, J. Galambos, G. Hoffstaetter, M. Hogan, M. Klute, S. Nagaitsev, M. Palmer, S. Prestemon, T. Roser, L. Rossi, V. Shiltsev, G. Varner, K. Yokoya
Planning the Future of U.S. Particle Physics (Snowmass 2013): Chapter 6: Accelerator Capabilities
26 pages
null
null
null
hep-ex hep-ph physics.acc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
These reports present the results of the 2013 Community Summer Study of the APS Division of Particles and Fields ("Snowmass 2013") on the future program of particle physics in the U.S. Chapter 6, on Accelerator Capabilities, discusses the future progress of accelerator technology, including issues for high-energy hadron and lepton colliders, high-intensity beams, electron-ion colliders, and necessary R&D for future accelerator technologies.
[ { "created": "Thu, 23 Jan 2014 18:59:20 GMT", "version": "v1" } ]
2014-01-24
[ [ "Barletta", "W. A.", "" ], [ "Bai", "M.", "" ], [ "Battaglia", "M.", "" ], [ "Bruning", "O.", "" ], [ "Byrd", "J.", "" ], [ "Ent", "R.", "" ], [ "Flanagan", "J.", "" ], [ "Gai", "W.", "" ], [ "Galambos", "J.", "" ], [ "Hoffstaetter", "G.", "" ], [ "Hogan", "M.", "" ], [ "Klute", "M.", "" ], [ "Nagaitsev", "S.", "" ], [ "Palmer", "M.", "" ], [ "Prestemon", "S.", "" ], [ "Roser", "T.", "" ], [ "Rossi", "L.", "" ], [ "Shiltsev", "V.", "" ], [ "Varner", "G.", "" ], [ "Yokoya", "K.", "" ] ]
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1401.6115
Michael E. Peskin
M. G. Gilchriese, P. Cushman, K. Heeger, J. Klein, K. Scholberg, H. Sobel, M. Witherell
Planning the Future of U.S. Particle Physics (Snowmass 2013): Chapter 7: Underground Laboratory Capabilities
19 pages
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null
hep-ex hep-ph physics.ins-det
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
These reports present the results of the 2013 Community Summer Study of the APS Division of Particles and Fields ("Snowmass 2013") on the future program of particle physics in the U.S. Chapter 7, on Underground Laboratory Capabilities, discusses the prospects and requirements for large underground experiments such as those for neutrino physics, proton decay, and dark matter.
[ { "created": "Thu, 23 Jan 2014 18:59:38 GMT", "version": "v1" } ]
2014-01-24
[ [ "Gilchriese", "M. G.", "" ], [ "Cushman", "P.", "" ], [ "Heeger", "K.", "" ], [ "Klein", "J.", "" ], [ "Scholberg", "K.", "" ], [ "Sobel", "H.", "" ], [ "Witherell", "M.", "" ] ]
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1401.6116
Michael E. Peskin
M. Demarteau, R. Lipton, H. Nicholson, I. Shipsey, D. Akerib, A. Albayrak-Yetkin, J. Alexander, J. Anderson, M. Artuso, D. Asner, R. Ball, M. Battaglia, C. Bebek, J. Beene, Y. Benhammou, E. Bentefour, M. Bergevin, A. Bernstein, B. Bilki, E. Blucher, G. Bolla, D. Bortoletto, N. Bowden, G. Brooijmans, K. Byrum, B. Cabrera, G. Cancelo, J. Carlstrom, B. Casey, C. Chang, J. Chapman, C.H. Chen, I. Childres, D. Christian, M. Convery, W. Cooper J. Corso, J. Cumalat, P. Cushman, C. Da Via, S. Dazeley, P. Debbins, G. Deptuch, S. Dhawan, V. Di Benedetto, B. DiGiovene, Z. Djurcic, S. Dye, A. Elagin, J. Estrada, H. Evans, E. Etzion, J. Fast, C. Ferretti, P. Fisher, B. Fleming, K. Francis, P. Friedman, H. Frisch, M. Garcia-Sciveres, C. Gatto, G. Geronim, G. Gilchriese, S. Golwala, C. Grant, A. Grillo, E. Gr\"unendahl, P. Gorham, L. Guan, G. Gutierrez, C. Haber, J. Hall, G. Haller, C. Hast, U. Heintz, T. Hemmick, D. G. Hitlin, C. Hogan, M. Hohlmann, E. Hoppe, L. Hsu, M. Huffer, K. Irwin, F. Izraelevitch, G. Jennings, M. Johnson, A. Jung, H. Kagan, C. Kenney, S. Kettell, R. Khanna, V. Khristenko, F. Krennrich, K. Kuehn, R. Kutschke, J. Learned, A. T. Lee, D. Levin, T. Liu, A. T. K. Liu, D. Lissauer, J. Love, D. Lynn, D. MacFarlane, S. Magill, S. Majewski, J. Mans, J. Maricic, P. Marleau, A. Mazzacane, D. McKinsey, J. Mehl, A. Mestvirisvilli, S. Meyer, N. Mokhov, M. Moshe, A. Mukherjee, P. Murat, S. Nahn, M. Narain, P. Nadel-Turonski, M. Newcomer, K. Nishimura, D. Nygren, E. Oberla, Y. Onel, M. Oreglia, J. Orrell, J. Paley, A. Para, S. Parker, V. Polychronakos, S. Pordes, P. Privitera, A. Prosser, M. Pyle, J. Raaf, E. Ramberg, R. Rameika, B. Rebel, J. Repond, D. Reyna, L. Ristori, R. Rivera, A. Ronzhin, R. Rusack, J. Russ, A. Ryd, H. Sadrozinski, H. Sahoo, M. C. Sanchez, C. Sanzeni, S. Schnetzer, S. Seidel, A. Seiden, I. Schmidt, A. Shenai, T. Shutt, Y. Silver, W. Smith, D. Snowden-Ifft, A. Sonnenschein, D. Southwick, L. Spiegel, M. Stanitzki, S. Striganov, D. Su, R. Sumner, R. Svoboda, M. Sweany, R. Talaga, R. Tayloe, S. Tentindo, N. Terentiev, J. Thom-Levy, C. Thorn, J. Tiffenberg, W. Trischuk, R. Tschirhart, M. Turner, D. Underwood, L. Uplegger, J. Urheim, M. Vagins, K. Van Bibber, G. Varner, R. Varner, J. Va'vra, H. Von der Lippe, R. Wagner, S. Wagner, C. Weaverdyck, H. Wenzel, A. Weinstein, M. Wetstein, A. White, R. Wigman, P. Wilson, D. Winn, P. Winter, C. Woody, L. Xia, J. Q. Xie, Z. Ye, M. F. Yeh, T. Yetkin, J. H. Yoo, J. Yu, J. M. Yu, S. Zeller, J. L. Zhang, J.J. Zhu, B. Zhou, R. Y. Zhu, B. Zitzer
Planning the Future of U.S. Particle Physics (Snowmass 2013): Chapter 8: Instrumentation Frontier
50 pages
null
null
null
hep-ex hep-ph physics.ins-det
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
These reports present the results of the 2013 Community Summer Study of the APS Division of Particles and Fields ("Snowmass 2013") on the future program of particle physics in the U.S. Chapter 8, on the Instrumentation Frontier, discusses the instrumentation needs of future experiments in the Energy, Intensity, and Cosmic Frontiers, promising new technologies for particle physics research, and issues of gathering resources for long-term research in this area.
[ { "created": "Thu, 23 Jan 2014 18:59:57 GMT", "version": "v1" } ]
2014-01-24
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1401.6117
Michael E. Peskin
L. A. T. Bauerdick, S. Gottlieb, G. Bell, K. Bloom, T. Blum, D. Brown, M. Butler, A. Connolly, E. Cormier, P. Elmer, M. Ernst, I. Fisk, G. Fuller, R. Gerber, S. Habib, M. Hildreth, S. Hoeche, D. Holmgren, C. Joshi, A. Mezzacappa, R. Mount, R. Pordes, B. Rebel, L. Reina, M. C. Sanchez, J. Shank, P. Spentzouris, A. Szalay, R. Van de Water, M. Wobisch, S. Wolbers
Planning the Future of U.S. Particle Physics (Snowmass 2013): Chapter 9: Computing
36 pages
null
null
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hep-ex hep-lat hep-ph physics.acc-ph physics.ins-det
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
These reports present the results of the 2013 Community Summer Study of the APS Division of Particles and Fields ("Snowmass 2013") on the future program of particle physics in the U.S. Chapter 9, on Computing, discusses the computing challenges for future experiments in the Energy, Intensity, and Cosmic Frontiers, for accelerator science, and for particle theory, as well as structural issues in supporting the intense uses of computing required in all areas of particle physics.
[ { "created": "Thu, 23 Jan 2014 19:00:15 GMT", "version": "v1" } ]
2014-01-24
[ [ "Bauerdick", "L. A. T.", "" ], [ "Gottlieb", "S.", "" ], [ "Bell", "G.", "" ], [ "Bloom", "K.", "" ], [ "Blum", "T.", "" ], [ "Brown", "D.", "" ], [ "Butler", "M.", "" ], [ "Connolly", "A.", "" ], [ "Cormier", "E.", "" ], [ "Elmer", "P.", "" ], [ "Ernst", "M.", "" ], [ "Fisk", "I.", "" ], [ "Fuller", "G.", "" ], [ "Gerber", "R.", "" ], [ "Habib", "S.", "" ], [ "Hildreth", "M.", "" ], [ "Hoeche", "S.", "" ], [ "Holmgren", "D.", "" ], [ "Joshi", "C.", "" ], [ "Mezzacappa", "A.", "" ], [ "Mount", "R.", "" ], [ "Pordes", "R.", "" ], [ "Rebel", "B.", "" ], [ "Reina", "L.", "" ], [ "Sanchez", "M. C.", "" ], [ "Shank", "J.", "" ], [ "Spentzouris", "P.", "" ], [ "Szalay", "A.", "" ], [ "Van de Water", "R.", "" ], [ "Wobisch", "M.", "" ], [ "Wolbers", "S.", "" ] ]
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1401.6119
Michael E. Peskin
M. Bardeen, D. Cronin-Hennessy, R. M. Barnett, P. Bhat, K. Cecire, K. Cranmer, T. Jordan, I. Karliner, J. Lykken, P. Norris, H. White, K. Yurkewicz
Planning the Future of U.S. Particle Physics (Snowmass 2013): Chapter 10: Communication, Education, and Outreach
26 pages
null
null
null
hep-ex hep-lat hep-ph hep-th physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
These reports present the results of the 2013 Community Summer Study of the APS Division of Particles and Fields ("Snowmass 2013") on the future program of particle physics in the U.S. Chapter 10, on Communication, Education, and Outreach, discusses the resources and issues for the communication of information about particle physics to teachers and students, to scientists in other fields, to policy makers, and to the general public.
[ { "created": "Thu, 23 Jan 2014 19:00:34 GMT", "version": "v1" }, { "created": "Fri, 24 Jan 2014 19:54:22 GMT", "version": "v2" } ]
2014-01-27
[ [ "Bardeen", "M.", "" ], [ "Cronin-Hennessy", "D.", "" ], [ "Barnett", "R. M.", "" ], [ "Bhat", "P.", "" ], [ "Cecire", "K.", "" ], [ "Cranmer", "K.", "" ], [ "Jordan", "T.", "" ], [ "Karliner", "I.", "" ], [ "Lykken", "J.", "" ], [ "Norris", "P.", "" ], [ "White", "H.", "" ], [ "Yurkewicz", "K.", "" ] ]
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1401.6120
Aurelien Thierry
Guillaume Bonfante (INRIA Nancy - Grand Est / LORIA), Jean-Yves Marion (INRIA Nancy - Grand Est / LORIA), Fabrice Sabatier (INRIA Nancy - Grand Est / LORIA), Aur\'elien Thierry (INRIA Nancy - Grand Est / LORIA)
Analysis and Diversion of Duqu's Driver
Malware 2013 - 8th International Conference on Malicious and Unwanted Software (2013)
null
null
null
cs.CR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The propagation techniques and the payload of Duqu have been closely studied over the past year and it has been said that Duqu shared functionalities with Stuxnet. We focused on the driver used by Duqu during the infection, our contribution consists in reverse-engineering the driver: we rebuilt its source code and analyzed the mechanisms it uses to execute the payload while avoiding detection. Then we diverted the driver into a defensive version capable of detecting injections in Windows binaries, thus preventing further attacks. We specifically show how Duqu's modified driver would have detected Duqu.
[ { "created": "Wed, 8 Jan 2014 12:43:09 GMT", "version": "v1" } ]
2014-01-24
[ [ "Bonfante", "Guillaume", "", "INRIA Nancy - Grand Est / LORIA" ], [ "Marion", "Jean-Yves", "", "INRIA Nancy - Grand Est / LORIA" ], [ "Sabatier", "Fabrice", "", "INRIA Nancy - Grand Est\n / LORIA" ], [ "Thierry", "Aurélien", "", "INRIA Nancy - Grand Est / LORIA" ] ]
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1401.6122
Tanmoy Chakraborty
Tanmoy Chakraborty, Dipankar Das, Sivaji Bandyopadhyay
Identifying Bengali Multiword Expressions using Semantic Clustering
25 pages, 3 figures, 5 tables, International Journal of Linguistics and Language Resources (Lingvistic{\ae} Investigationes), 2014
null
null
null
cs.CL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
One of the key issues in both natural language understanding and generation is the appropriate processing of Multiword Expressions (MWEs). MWEs pose a huge problem to the precise language processing due to their idiosyncratic nature and diversity in lexical, syntactical and semantic properties. The semantics of a MWE cannot be expressed after combining the semantics of its constituents. Therefore, the formalism of semantic clustering is often viewed as an instrument for extracting MWEs especially for resource constraint languages like Bengali. The present semantic clustering approach contributes to locate clusters of the synonymous noun tokens present in the document. These clusters in turn help measure the similarity between the constituent words of a potentially candidate phrase using a vector space model and judge the suitability of this phrase to be a MWE. In this experiment, we apply the semantic clustering approach for noun-noun bigram MWEs, though it can be extended to any types of MWEs. In parallel, the well known statistical models, namely Point-wise Mutual Information (PMI), Log Likelihood Ratio (LLR), Significance function are also employed to extract MWEs from the Bengali corpus. The comparative evaluation shows that the semantic clustering approach outperforms all other competing statistical models. As a by-product of this experiment, we have started developing a standard lexicon in Bengali that serves as a productive Bengali linguistic thesaurus.
[ { "created": "Thu, 23 Jan 2014 19:03:18 GMT", "version": "v1" } ]
2014-01-24
[ [ "Chakraborty", "Tanmoy", "" ], [ "Das", "Dipankar", "" ], [ "Bandyopadhyay", "Sivaji", "" ] ]
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1401.6124
Fabricio de Franca Olivetti
Fabricio Olivetti de Franca
Iterative Universal Hash Function Generator for Minhashing
6 pages, 4 tables, 1 algorithm
null
null
null
cs.LG cs.IR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Minhashing is a technique used to estimate the Jaccard Index between two sets by exploiting the probability of collision in a random permutation. In order to speed up the computation, a random permutation can be approximated by using an universal hash function such as the $h_{a,b}$ function proposed by Carter and Wegman. A better estimate of the Jaccard Index can be achieved by using many of these hash functions, created at random. In this paper a new iterative procedure to generate a set of $h_{a,b}$ functions is devised that eliminates the need for a list of random values and avoid the multiplication operation during the calculation. The properties of the generated hash functions remains that of an universal hash function family. This is possible due to the random nature of features occurrence on sparse datasets. Results show that the uniformity of hashing the features is maintaned while obtaining a speed up of up to $1.38$ compared to the traditional approach.
[ { "created": "Thu, 23 Jan 2014 19:03:38 GMT", "version": "v1" } ]
2014-01-25
[ [ "de Franca", "Fabricio Olivetti", "" ] ]
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Iterative Universal Hash Function Generator for Minhashing
http://arxiv.org/abs/1401.6124v1
http://arxiv.org/pdf/1401.6124v1.pdf
https://github.com/folivetti/HBLCoClust
true
true
https://paperswithcode.com/paper/iterative-universal-hash-function-generator
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1401.6125
HyungTae Kim Dr.
HyungTae Kim, HaeJeong Yang
Software Architecture and Subclassing Technique for Semiconductor Manufacturing Machines
12 pages, 10 figures, International Journal of Soft Computing And Software Engineering (JSCSE). 2012 ISSN: 2251-7545
null
10.7321/jscse.v2.n12.1
null
cs.OH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper proposed software architecture for operating an automatic semiconductor manufacturing machine. Recent machines for semiconductor process are required for high level of automation which are composed of motion control, machine vision, data acquisition and networking. These functions are executed through industrial equipments that are generally installed in a computer. The equipments occupy a great part of system resource and generate a lot of computation, so the software structure should be designed for efficiency. The proposed architecture is consisted of four layers and virtual equipments(VEs). The VEs are made by subclassing the physical equipments(PEs) and the layers are coded into thread which updates the status of VEs. Subroutines in a program refer to the pointer of VEs, and direct access to physical equipment are prohibited. The number of access (NOA) to PEs in typical industrial application was simulated for the unlimited access structure and the presented structure. The result showed that the proposed structure was more efficient than typical ones and irrespective of subroutines. This architecture was also applied to design a machine operating software and performed automatic wafer dicing.
[ { "created": "Tue, 21 Jan 2014 07:19:14 GMT", "version": "v1" } ]
2014-01-24
[ [ "Kim", "HyungTae", "" ], [ "Yang", "HaeJeong", "" ] ]
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1401.6131
Jo\~ao V. Gra\c{c}a
Jo\~ao V. Gra\c{c}a, Kuzman Ganchev, Luisa Coheur, Fernando Pereira, Ben Taskar
Controlling Complexity in Part-of-Speech Induction
null
Journal Of Artificial Intelligence Research, Volume 41, pages 527-551, 2011
10.1613/jair.3348
null
cs.CL cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider the problem of fully unsupervised learning of grammatical (part-of-speech) categories from unlabeled text. The standard maximum-likelihood hidden Markov model for this task performs poorly, because of its weak inductive bias and large model capacity. We address this problem by refining the model and modifying the learning objective to control its capacity via para- metric and non-parametric constraints. Our approach enforces word-category association sparsity, adds morphological and orthographic features, and eliminates hard-to-estimate parameters for rare words. We develop an efficient learning algorithm that is not much more computationally intensive than standard training. We also provide an open-source implementation of the algorithm. Our experiments on five diverse languages (Bulgarian, Danish, English, Portuguese, Spanish) achieve significant improvements compared with previous methods for the same task.
[ { "created": "Thu, 16 Jan 2014 05:20:08 GMT", "version": "v1" } ]
2014-01-24
[ [ "Graça", "João V.", "" ], [ "Ganchev", "Kuzman", "" ], [ "Coheur", "Luisa", "" ], [ "Pereira", "Fernando", "" ], [ "Taskar", "Ben", "" ] ]
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1401.6134
Yasin Yilmaz
Yasin Yilmaz, Ziyu Guo, Xiaodong Wang
Sequential Joint Spectrum Sensing and Channel Estimation for Dynamic Spectrum Access
null
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Dynamic spectrum access under channel uncertainties is considered. With the goal of maximizing the secondary user (SU) throughput subject to constraints on the primary user (PU) outage probability we formulate a joint problem of spectrum sensing and channel state estimation. The problem is cast into a sequential framework since sensing time minimization is crucial for throughput maximization. In the optimum solution, the sensing decision rule is coupled with the channel estimator, making the separate treatment of the sensing and channel estimation strictly suboptimal. Using such a joint structure for spectrum sensing and channel estimation we propose a distributed (cooperative) dynamic spectrum access scheme under statistical channel state information (CSI). In the proposed scheme, the SUs report their sufficient statistics to a fusion center (FC) via level-triggered sampling, a nonuniform sampling technique that is known to be bandwidth-and-energy efficient. Then, the FC makes a sequential spectrum sensing decision using local statistics and channel estimates, and selects the SU with the best transmission opportunity. The selected SU, using the sensing decision and its channel estimates, computes the transmit power and starts data transmission. Simulation results demonstrate that the proposed scheme significantly outperforms its conventional counterparts, under the same PU outage constraints, in terms of the achievable SU throughput.
[ { "created": "Wed, 22 Jan 2014 20:23:02 GMT", "version": "v1" } ]
2014-01-24
[ [ "Yilmaz", "Yasin", "" ], [ "Guo", "Ziyu", "" ], [ "Wang", "Xiaodong", "" ] ]
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1401.6135
Shirin Saeedi Bidokhti
Shirin Saeedi Bidokhti and Gerhard Kramer
Capacity Bounds for a Class of Diamond Networks
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null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A class of diamond networks are studied where the broadcast component is modelled by two independent bit-pipes. New upper and low bounds are derived on the capacity which improve previous bounds. The upper bound is in the form of a max-min problem, where the maximization is over a coding distribution and the minimization is over an auxiliary channel. The proof technique generalizes bounding techniques of Ozarow for the Gaussian multiple description problem (1981), and Kang and Liu for the Gaussian diamond network (2011). The bounds are evaluated for a Gaussian multiple access channel (MAC) and the binary adder MAC, and the capacity is found for interesting ranges of the bit-pipe capacities.
[ { "created": "Thu, 23 Jan 2014 19:17:06 GMT", "version": "v1" } ]
2014-01-24
[ [ "Bidokhti", "Shirin Saeedi", "" ], [ "Kramer", "Gerhard", "" ] ]
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1401.6136
Jan Ostergaard
Adel Zahedi, Jan Ostergaard, Soren Holdt Jensen, Patrick Naylor, Soren Bech
Distributed Remote Vector Gaussian Source Coding with Covariance Distortion Constraints
This is the final version accepted at ISIT'14
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we consider a distributed remote source coding problem, where a sequence of observations of source vectors is available at the encoder. The problem is to specify the optimal rate for encoding the observations subject to a covariance matrix distortion constraint and in the presence of side information at the decoder. For this problem, we derive lower and upper bounds on the rate-distortion function (RDF) for the Gaussian case, which in general do not coincide. We then provide some cases, where the RDF can be derived exactly. We also show that previous results on specific instances of this problem can be generalized using our results. We finally show that if the distortion measure is the mean squared error, or if it is replaced by a certain mutual information constraint, the optimal rate can be derived from our main result.
[ { "created": "Thu, 23 Jan 2014 19:22:23 GMT", "version": "v1" }, { "created": "Wed, 4 Jun 2014 13:04:08 GMT", "version": "v2" } ]
2014-06-05
[ [ "Zahedi", "Adel", "" ], [ "Ostergaard", "Jan", "" ], [ "Jensen", "Soren Holdt", "" ], [ "Naylor", "Patrick", "" ], [ "Bech", "Soren", "" ] ]
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1401.6141
Anna Frishman
Anna Frishman and Gregory Falkovich
New type of anomaly in turbulence
null
Phys. Rev. Lett. 113, 024501 (2014)
10.1103/PhysRevLett.113.024501
null
nlin.CD cond-mat.stat-mech hep-th physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The turbulent energy flux through scales, $\bar{\epsilon}$, remains constant and non vanishing in the limit of zero viscosity, which results in the fundamental anomaly of time irreversibility. It was considered straightforward to deduce from this the Lagrangian velocity anomaly, $\left< d u^2/dt\right>=-4 \bar{\epsilon}$ at $t=0$, where $\vec{u}$ is the velocity difference of a pair of particles, initially separated by a fixed distance. In this letter we demonstrate that this derivation assumed first taking the limit $t \to 0$ and then $\nu \to 0$, while the true anomaly requires taking viscosity to zero first. For compressible turbulence we find that the limits $t \to 0$ and $\nu \to 0$ do not commute and the Lagrangian anomaly is completely altered: $\left< d u^2/dt\right>$ has different values forward and backward in time. We show that this new anomaly is related to the particles entering/exiting shocks forward/backward in time. For incompressible flows, on the other hand, we show that the limits can be interchanged and the Lagrangian anomaly is still induced by the flux law, apparently due to a homogeneous distribution of fluid particles at all times.
[ { "created": "Thu, 23 Jan 2014 19:52:40 GMT", "version": "v1" }, { "created": "Tue, 11 Feb 2014 15:35:42 GMT", "version": "v2" }, { "created": "Tue, 9 Sep 2014 06:45:45 GMT", "version": "v3" } ]
2015-06-18
[ [ "Frishman", "Anna", "" ], [ "Falkovich", "Gregory", "" ] ]
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1401.6145
Monowar Hasan
Hesham ElSawy and Ekram Hossain
On Stochastic Geometry Modeling of Cellular Uplink Transmission with Truncated Channel Inversion Power Control
Submitted to IEEE Transactions on Wireless Communications (TWC)
null
null
null
cs.IT cs.NI math.IT math.ST stat.TH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Using stochastic geometry, we develop a tractable uplink modeling paradigm for outage probability and spectral efficiency in both single and multi-tier cellular wireless networks. The analysis accounts for per user equipment (UE) power control as well as the maximum power limitations for UEs. More specifically, for interference mitigation and robust uplink communication, each UE is required to control its transmit power such that the average received signal power at its serving base station (BS) is equal to a certain threshold $\rho_o$. Due to the limited transmit power, the UEs employ a truncated channel inversion power control policy with a cutoff threshold of $\rho_o$. We show that there exists a transfer point in the uplink system performance that depends on the tuple: BS intensity ($\lambda$), maximum transmit power of UEs ($P_u$), and $\rho_o$. That is, when $P_u$ is a tight operational constraint with respect to [w.r.t.] $\lambda$ and $\rho_o$, the uplink outage probability and spectral efficiency highly depend on the values of $\lambda$ and $\rho_o$. In this case, there exists an optimal cutoff threshold $\rho^*_o$, which depends on the system parameters, that minimizes the outage probability. On the other hand, when $P_u$ is not a binding operational constraint w.r.t. $\lambda$ and $\rho_o$, the uplink outage probability and spectral efficiency become independent of $\lambda$ and $\rho_o$. We obtain approximate yet accurate simple expressions for outage probability and spectral efficiency which reduce to closed-forms in some special cases.
[ { "created": "Thu, 23 Jan 2014 19:59:44 GMT", "version": "v1" } ]
2014-01-24
[ [ "ElSawy", "Hesham", "" ], [ "Hossain", "Ekram", "" ] ]
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1401.6157
Christian Schulz
Christian Schulz, Amin Mazloumian, Alexander M Petersen, Orion Penner, Dirk Helbing
Exploiting citation networks for large-scale author name disambiguation
14 pages, 5 figures
EPJ Data Science 2014, 3:11
10.1140/epjds/s13688-014-0011-3
null
cs.DL cs.SI physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a novel algorithm and validation method for disambiguating author names in very large bibliographic data sets and apply it to the full Web of Science (WoS) citation index. Our algorithm relies only upon the author and citation graphs available for the whole period covered by the WoS. A pair-wise publication similarity metric, which is based on common co-authors, self-citations, shared references and citations, is established to perform a two-step agglomerative clustering that first connects individual papers and then merges similar clusters. This parameterized model is optimized using an h-index based recall measure, favoring the correct assignment of well-cited publications, and a name-initials-based precision using WoS metadata and cross-referenced Google Scholar profiles. Despite the use of limited metadata, we reach a recall of 87% and a precision of 88% with a preference for researchers with high h-index values. 47 million articles of WoS can be disambiguated on a single machine in less than a day. We develop an h-index distribution model, confirming that the prediction is in excellent agreement with the empirical data, and yielding insight into the utility of the h-index in real academic ranking scenarios.
[ { "created": "Thu, 23 Jan 2014 20:42:11 GMT", "version": "v1" }, { "created": "Wed, 10 Dec 2014 01:20:41 GMT", "version": "v2" } ]
2014-12-11
[ [ "Schulz", "Christian", "" ], [ "Mazloumian", "Amin", "" ], [ "Petersen", "Alexander M", "" ], [ "Penner", "Orion", "" ], [ "Helbing", "Dirk", "" ] ]
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1401.6169
Hossein Soleimani
Hossein Soleimani, David J. Miller
Parsimonious Topic Models with Salient Word Discovery
null
IEEE Transaction on Knowledge and Data Engineering, 27 (2015) 824-837
10.1109/TKDE.2014.2345378
null
cs.LG cs.CL cs.IR stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose a parsimonious topic model for text corpora. In related models such as Latent Dirichlet Allocation (LDA), all words are modeled topic-specifically, even though many words occur with similar frequencies across different topics. Our modeling determines salient words for each topic, which have topic-specific probabilities, with the rest explained by a universal shared model. Further, in LDA all topics are in principle present in every document. By contrast our model gives sparse topic representation, determining the (small) subset of relevant topics for each document. We derive a Bayesian Information Criterion (BIC), balancing model complexity and goodness of fit. Here, interestingly, we identify an effective sample size and corresponding penalty specific to each parameter type in our model. We minimize BIC to jointly determine our entire model -- the topic-specific words, document-specific topics, all model parameter values, {\it and} the total number of topics -- in a wholly unsupervised fashion. Results on three text corpora and an image dataset show that our model achieves higher test set likelihood and better agreement with ground-truth class labels, compared to LDA and to a model designed to incorporate sparsity.
[ { "created": "Wed, 22 Jan 2014 21:47:48 GMT", "version": "v1" }, { "created": "Thu, 11 Sep 2014 20:24:41 GMT", "version": "v2" } ]
2016-05-16
[ [ "Soleimani", "Hossein", "" ], [ "Miller", "David J.", "" ] ]
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Parsimonious Topic Models with Salient Word Discovery
http://arxiv.org/abs/1401.6169v2
http://arxiv.org/pdf/1401.6169v2.pdf
https://github.com/hsoleimani/PTM
true
true
https://paperswithcode.com/paper/parsimonious-topic-models-with-salient-word
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1401.6170
Jose Teixeira
Joni Salminen and Jose Teixeira
Fools gold? Developer dilemmas in a closed mobile application market platform
Presented at the 15th International Conference on Electronic Commerce, ICEC 2013, Turku, Finland, August 13-15, 2013
null
10.1007/978-3-642-39808-7_11
null
cs.CY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we outline some potential conflicts that platform owners and software developers face in mobile application markets. Our arguments are based on comments captured in specialized online discussion forums, in which developers gather to share knowledge and experiences. The key findings indicate conflicts of interests, including 1) intra-platform competition, 2) discriminative promotion, 3) entry prevention, 4) restricted monetization, 5) restricted knowledge sharing, 6) substitution, and 7) strategic technology selection. Opportunistic platform owners may use their power to discriminate between third-part software developers. However, there are also potential strategic solutions that developers can apply; for example diversification (multi-homing), syndication and brand building.
[ { "created": "Thu, 23 Jan 2014 15:49:47 GMT", "version": "v1" } ]
2014-01-27
[ [ "Salminen", "Joni", "" ], [ "Teixeira", "Jose", "" ] ]
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1401.6174
Gong Zhe-Xuan
Zhe-Xuan Gong, Michael Foss-Feig, Spyridon Michalakis and Alexey V. Gorshkov
Persistence of locality in systems with power-law interactions
5 pages, 4 figures, version accepted by PRL
Phys. Rev. Lett. 113, 030602 (2014)
10.1103/PhysRevLett.113.030602
null
quant-ph cond-mat.quant-gas physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Motivated by recent experiments with ultra-cold matter, we derive a new bound on the propagation of information in $D$-dimensional lattice models exhibiting $1/r^{\alpha}$ interactions with $\alpha>D$. The bound contains two terms: One accounts for the short-ranged part of the interactions, giving rise to a bounded velocity and reflecting the persistence of locality out to intermediate distances, while the other contributes a power-law decay at longer distances. We demonstrate that these two contributions not only bound but, except at long times, \emph{qualitatively reproduce} the short- and long-distance dynamical behavior following a local quench in an $XY$ chain and a transverse-field Ising chain. In addition to describing dynamics in numerous intractable long-range interacting lattice models, our results can be experimentally verified in a variety of ultracold-atomic and solid-state systems.
[ { "created": "Thu, 23 Jan 2014 21:00:05 GMT", "version": "v1" }, { "created": "Mon, 7 Jul 2014 17:48:30 GMT", "version": "v2" } ]
2015-10-06
[ [ "Gong", "Zhe-Xuan", "" ], [ "Foss-Feig", "Michael", "" ], [ "Michalakis", "Spyridon", "" ], [ "Gorshkov", "Alexey V.", "" ] ]
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1401.6183
Eric Edlund
Eric M. Edlund and Hantao Ji
Nonlinear stability of laboratory quasi-Keplerian flows
11 pages, 5 figures. Accepted for publication in PRE
Phys. Rev. E 89, 021004(R), 2014
10.1103/PhysRevE.89.021004
null
astro-ph.IM physics.flu-dyn
http://creativecommons.org/licenses/publicdomain/
Experiments in a modified Taylor-Couette device, spanning Reynolds numbers of $10^5$ to greater than $10^6$, reveal the nonlinear stability of astrophysically-relevant flows. Nearly ideal rotation, expected in the absence of axial boundaries, is achieved for a narrow range of operating parameters. Departures from the optimal control space identify centrifugal instability of boundary layers as the primary source of turbulence likely observed in former experiments. By driving turbulence from a series of jets we demonstrate the robustly quiescent nature of quasi-Keplerian flows, indicating that sustained turbulence does not exist.
[ { "created": "Thu, 23 Jan 2014 21:01:41 GMT", "version": "v1" }, { "created": "Mon, 27 Jan 2014 14:24:11 GMT", "version": "v2" } ]
2014-03-04
[ [ "Edlund", "Eric M.", "" ], [ "Ji", "Hantao", "" ] ]
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1401.6184
Thomas Vogel
Christoph Junghans, Danny Perez, Thomas Vogel
Molecular Dynamics in the Multicanonical Ensemble: Equivalence of Wang-Landau Sampling, Statistical Temperature Molecular Dynamics, and Metadynamics
null
J. Chem. Theory Comput. 10, 5, 1843-1847 (2014)
10.1021/ct500077d
null
cond-mat.stat-mech cond-mat.mtrl-sci cond-mat.soft physics.comp-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We show direct formal relationship between the Wang-Landau iteration [PRL 86, 2050 (2001)], metadynamics [PNAS 99, 12562 (2002)] and statistical temperature molecular dynamics [PRL 97, 050601 (2006)], the major Monte Carlo and molecular dynamics work-horses for sampling from a generalized, multicanonical ensemble. We demonstrate that statistical temperature molecular dynamics (which is formally derived from the Wang-Landau method), augmented by the introduction of kernel updates of the statistical temperature, generates dynamics which are indistinguishable from a corresponding metadynamics simulation. We also show that the use of a Gaussian kernel significantly improves the performance of statistical temperature molecular dynamics, highlighting the practical benefits of this improved formal understanding.
[ { "created": "Thu, 23 Jan 2014 21:02:55 GMT", "version": "v1" }, { "created": "Tue, 29 Apr 2014 19:59:32 GMT", "version": "v2" } ]
2021-05-13
[ [ "Junghans", "Christoph", "" ], [ "Perez", "Danny", "" ], [ "Vogel", "Thomas", "" ] ]
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1401.6189
Zeev Dvir
Jean Bourgain, Zeev Dvir, Ethan Leeman
Affine extractors over large fields with exponential error
To appear in Comput. Complex
null
null
null
cs.CC math.NT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We describe a construction of explicit affine extractors over large finite fields with exponentially small error and linear output length. Our construction relies on a deep theorem of Deligne giving tight estimates for exponential sums over smooth varieties in high dimensions.
[ { "created": "Thu, 23 Jan 2014 21:15:16 GMT", "version": "v1" } ]
2014-01-27
[ [ "Bourgain", "Jean", "" ], [ "Dvir", "Zeev", "" ], [ "Leeman", "Ethan", "" ] ]
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1401.6190
Georg B\"ocherer
Georg B\"ocherer
Probabilistic Signal Shaping for Bit-Metric Decoding
7 pages; compared to v2, the title has slightly changed. More references to related work have been added. A shortened version will appear in the proceedings of the ISIT 14
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cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A scheme is proposed that combines probabilistic signal shaping with bit-metric decoding. The transmitter generates symbols according to a distribution on the channel input alphabet. The symbols are labeled by bit strings. At the receiver, the channel output is decoded with respect to a bit-metric. An achievable rate is derived using random coding arguments. For the 8-ASK AWGN channel, numerical results show that at a spectral efficiency of 2 bits/s/Hz, the new scheme outperforms bit-interleaved coded modulation (BICM) without shaping and BICM with bit shaping (i Fabregas and Martinez, 2010) by 0.87 dB and 0.15 dB, respectively, and is within 0.0094 dB of the coded modulation capacity. The new scheme is implemented by combining a distribution matcher with a systematic binary low-density parity-check code. The measured finite-length gains are very close to the gains predicted by the asymptotic theory.
[ { "created": "Thu, 23 Jan 2014 21:16:58 GMT", "version": "v1" }, { "created": "Tue, 28 Jan 2014 07:49:05 GMT", "version": "v2" }, { "created": "Sun, 20 Apr 2014 03:47:26 GMT", "version": "v3" } ]
2014-04-22
[ [ "Böcherer", "Georg", "" ] ]
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1401.6193
Paloma A. Huidobro
A. Gonzalez-Tudela, P. A. Huidobro, L. Martin-Moreno, C. Tejedor, and F.J. Garcia-Vidal
Reversible dynamics of single quantum emitters near metal-dielectric interfaces
null
Physical Review B 89, 041402(R) (2014)
10.1103/PhysRevB.89.041402
null
cond-mat.mes-hall physics.optics quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Here we present a systematic study of the dynamics of a single quantum emitter near a flat metal-dielectric interface. We identify the key elements that determine the onset of reversibility in these systems by using a formalism suited for absorbing media and through an exact integration of the dynamics. Moreover, when the quantum emitter separation from the surface is small, we are able to describe the dynamics within a pseudomode description that yields analytical understanding and allows more powerful calculations.
[ { "created": "Thu, 23 Jan 2014 21:22:10 GMT", "version": "v1" } ]
2014-01-27
[ [ "Gonzalez-Tudela", "A.", "" ], [ "Huidobro", "P. A.", "" ], [ "Martin-Moreno", "L.", "" ], [ "Tejedor", "C.", "" ], [ "Garcia-Vidal", "F. J.", "" ] ]
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1401.6194
Paloma A. Huidobro
Paloma A. Huidobro, Sadao Ota, Xiaodong Yang, Xiaobo Yin, F. J. Garcia-Vidal, and Xiang Zhang
Plasmonic Brownian ratchet
null
Physical Review B 88, 201401(R) (2013)
10.1103/PhysRevB.88.201401
null
cond-mat.mes-hall physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Here we present a Brownian ratchet based on plasmonic interactions. By periodically turning on and off a laser beam that illuminates a periodic array of plasmonic nanostructures with broken spatial symmetry, the random thermal motion of a subwavelength dielectric bead is rectified into one direction. By means of the Molecular Dynamics technique we show a statistical directed drift in particle flow.
[ { "created": "Thu, 23 Jan 2014 21:22:27 GMT", "version": "v1" } ]
2014-01-27
[ [ "Huidobro", "Paloma A.", "" ], [ "Ota", "Sadao", "" ], [ "Yang", "Xiaodong", "" ], [ "Yin", "Xiaobo", "" ], [ "Garcia-Vidal", "F. J.", "" ], [ "Zhang", "Xiang", "" ] ]
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1401.6196
Quan Zhou
Q. Zhou, O. Michailovich and Y. Rathi
Spatially regularized reconstruction of fibre orientation distributions in the presence of isotropic diffusion
33 pages, 14 figures, journal
null
null
null
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The connectivity and structural integrity of the white matter of the brain is nowadays known to be implicated into a wide range of brain-related disorders. However, it was not before the advent of diffusion Magnetic Resonance Imaging (dMRI) that researches have been able to examine the properties of white matter in vivo. Presently, among a range of various methods of dMRI, high angular resolution diffusion imaging (HARDI) is known to excel in its ability to provide reliable information about the local orientations of neural fasciculi (aka fibre tracts). Moreover, as opposed to the more traditional diffusion tensor imaging (DTI), HARDI is capable of distinguishing the orientations of multiple fibres passing through a given spatial voxel. Unfortunately, the ability of HARDI to discriminate between neural fibres that cross each other at acute angles is always limited, which is the main reason behind the development of numerous post-processing tools, aiming at the improvement of the directional resolution of HARDI. Among such tools is spherical deconvolution (SD). Due to its ill-posed nature, however, SD standardly relies on a number of a priori assumptions which are to render its results unique and stable. In this paper, we propose a different approach to the problem of SD in HARDI, which accounts for the spatial continuity of neural fibres as well as the presence of isotropic diffusion. Subsequently, we demonstrate how the proposed solution can be used to successfully overcome the effect of partial voluming, while preserving the spatial coherency of cerebral diffusion at moderate-to-severe noise levels. In a series of both in silico and in vivo experiments, the performance of the proposed method is compared with that of several available alternatives, with the comparative results clearly supporting the viability and usefulness of our approach.
[ { "created": "Thu, 23 Jan 2014 21:37:48 GMT", "version": "v1" } ]
2014-01-27
[ [ "Zhou", "Q.", "" ], [ "Michailovich", "O.", "" ], [ "Rathi", "Y.", "" ] ]
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1401.6208
Rafayel Mirzoyan
A. Sargsyan, A. Tonoyan, R. Mirzoyan, D. Sarkisyan, A.M. Wojciechowski A. Stabrawa and W. Gawlik
Saturated-absorption spectroscopy revisited: atomic transitions in strong magnetic fields ($>$20 mT) with a micrometer-thin cell
4 pages, 6 figures
null
10.1364/OL.39.002270
null
physics.atom-ph physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The existence of cross-over resonances makes saturated-absorption spectra very complicated when external magnetic field B is applied. It is demonstrated for the first time that the use of micrometric-thin cells (MTC, $L\approx40\,\mu$m) allows application of SA for quantitative studies of frequency splittings and shifts of the Rb atomic transitions in a wide range of external magnetic fields, from 0.2 up to 6 kG (20-600 mT). We compare the SA spectra obtained with the MTC with those obtained with other techniques, and present applications for optical magnetometry with micrometer spatial resolution and a broadly tunable optical frequency reference.
[ { "created": "Thu, 23 Jan 2014 22:49:42 GMT", "version": "v1" }, { "created": "Mon, 27 Jan 2014 22:53:04 GMT", "version": "v2" } ]
2015-06-18
[ [ "Sargsyan", "A.", "" ], [ "Tonoyan", "A.", "" ], [ "Mirzoyan", "R.", "" ], [ "Sarkisyan", "D.", "" ], [ "Stabrawa", "A. M. Wojciechowski A.", "" ], [ "Gawlik", "W.", "" ] ]
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1401.6210
Pradeep Chathuranga Weeraddana
Elisabetta Alfonsetti, Pradeep Chathuranga Weeraddana, Carlo Fischione
A Semi Distributed Approach for Min-Max Fair Car-Parking Slot Assignment Problem
14 pages, 12 figures, 2 tables
null
null
null
math.OC cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Designing efficient car parking mechanisms that can be potentially integrated into future intelligent transportation systems is of crucial importance. Usually, the related design problems are combinatorial and the worst-case complexity of optimal solution approaches grows exponentially with the problem sizes. Therefore, such optimal approaches are not scalable and practically undesirable. As a result, almost all existing methods for parking slot assignment are simple and greedy approaches, where each car is assigned a free parking slot, which is closer to its destination. Moreover, no emphasis is placed to optimize the social benefit of the users during the parking slot assignment. In this paper, the fairness as a metric for modeling the aggregate social benefit of the users is considered and a distributed algorithm based on Lagrange duality theory is developed. The proposed algorithm is gracefully scalable compared to the optimal methods. In addition, it is shown that the proposed car parking mechanism preserves privacy in the sense that any car involved in the algorithm will not be able to discover the destination of any other car during the algorithm iterations. Numerical results illustrate the performance of the proposed algorithm compared to the optimal assignment and a greedy method. They show that our algorithm yields a good tradeoff between the implementation-level simplicity and the performance. Even though the main emphasis in this paper resides in the car parking slot assignment problem, our formulation and the algorithms, in general, can also be applied or adopted in fair agent-target assignment problems in other application domains.
[ { "created": "Thu, 23 Jan 2014 23:00:56 GMT", "version": "v1" } ]
2014-01-27
[ [ "Alfonsetti", "Elisabetta", "" ], [ "Weeraddana", "Pradeep Chathuranga", "" ], [ "Fischione", "Carlo", "" ] ]
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1401.6217
Omer San
Omer San, Anne E. Staples, Traian Iliescu
A posteriori analysis of low-pass spatial filters for approximate deconvolution large eddy simulations of homogeneous incompressible flows
null
International Journal of Computational Fluid Dynamics, 29, 40-66 (2015)
10.1080/10618562.2014.991391
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The goal of this paper is twofold: first, it investigates the effect of low-pass spatial filters for approximate deconvolution large eddy simulation (AD-LES) of turbulent incompressible flows. Second, it proposes the hyper-differential filter as a means of increasing the accuracy of the AD-LES model without increasing the computational cost. Box filters, Pad\'{e} filters, and differential filters with a wide range of parameters are studied in the AD-LES framework. The AD-LES model, in conjunction with these spatial filters, is tested in the numerical simulation of the three-dimensional Taylor-Green vortex problem. The numerical results are benchmarked against direct numerical simulation (DNS) data. An under-resolved numerical simulation is also used for comparison purposes. Four criteria are used to investigate the AD-LES model equipped with these spatial filters: (i) the time series of the volume-averaged enstrophy; (ii) the volume-averaged third-order structure function; (iii) the $L^2$-norm of the velocity and vorticity errors; and (iv) the volume-averaged velocity and vorticity correlation coefficients. According to these criteria, the numerical results yield the following two conclusions: first, the AD-LES model equipped with any of these spatial filters yields accurate results at a fraction of the computational cost of DNS. Second, the most accurate results are obtained with the hyper-differential filter, followed by the differential filter. We demonstrate that the results highly depend on the selection of the filtering procedure. Although a careful parameter choice makes each class of filters used in this study competitive, it seems that filters whose transfer function resembles that of the Fourier cut-off filter (such as the hyper-differential filters) tend to perform best.
[ { "created": "Thu, 23 Jan 2014 23:43:16 GMT", "version": "v1" } ]
2018-01-29
[ [ "San", "Omer", "" ], [ "Staples", "Anne E.", "" ], [ "Iliescu", "Traian", "" ] ]
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1401.6218
Omer San
Omer San, Traian Iliescu
A stabilized proper orthogonal decomposition reduced-order model for large scale quasigeostrophic ocean circulation
null
Advances in Computational Mathematics, 41, 1289-1319 (2015)
10.1007/s10444-015-9417-0
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, a stabilized proper orthogonal decomposition (POD) reduced-order model (ROM) is presented for the barotropic vorticity equation. We apply the POD-ROM model to mid-latitude simplified oceanic basins, which are standard prototypes of more realistic large-scale ocean dynamics. A mode dependent eddy viscosity closure scheme is used to model the effects of the discarded POD modes. A sensitivity analysis with respect to the free eddy viscosity stabilization parameter is performed for various POD-ROMs with different numbers of POD modes. The POD-ROM results are validated against the Munk layer resolving direct numerical simulations using a fully conservative fourth-order Arakawa scheme. A comparison with the standard Galerkin POD-ROM without any stabilization is also included in our investigation. Significant improvements in the accuracy over the standard Galerkin model are shown for a four-gyre ocean circulation problem. This first step in the numerical assessment of the POD-ROM shows that it could represent a computationally efficient tool for large scale oceanic simulations over long time intervals.
[ { "created": "Thu, 23 Jan 2014 23:47:05 GMT", "version": "v1" } ]
2018-01-29
[ [ "San", "Omer", "" ], [ "Iliescu", "Traian", "" ] ]
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1401.6219
Youlong Wu
Youlong Wu and Mich\`ele Wigger
Coding Schemes with Rate-Limited Feedback that Improve over the Nofeedback Capacity for a Large Class of Broadcast Channels
58 pages, 4 figures, accepted by IEEE Transactions on Information Theory
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose two coding schemes for the two-receiver discrete memoryless broadcast channel (BC) with rate-limited feedback from one or both receivers. They improve over the nofeedback capacity region for a large class of channels, including the class of \emph{strictly essentially less-noisy BCs} that we introduce in this article. Examples of strictly essentially less-noisy BCs are the binary symmetric BC (BSBC) or the binary erasure BC (BEBC) with unequal cross-over or erasure probabilities at the two receivers. When the feedback rates are sufficiently large, our schemes recover all previously known capacity results for discrete memoryless BCs with feedback. In both our schemes, we let the receivers feed back quantization messages about their receive signals. In the first scheme, the transmitter simply \emph{relays} the quantization information obtained from Receiver 1 to Receiver 2, and vice versa. This provides each receiver with a second observation of the input signal and can thus improve its decoding performance unless the BC is physically degraded. Moreover, each receiver uses its knowledge of the quantization message describing its own outputs so as to attain the same performance as if this message had not been transmitted at all. In our second scheme the transmitter first \emph{reconstructs and processes} the quantized output signals, and then sends the outcome as a common update information to both receivers. A special case of our second scheme applies also to memoryless BCs without feedback but with strictly-causal state-information at the transmitter and causal state-information at the receivers. It recovers all previous achievable regions also for this setup with state-information.
[ { "created": "Thu, 23 Jan 2014 23:47:29 GMT", "version": "v1" }, { "created": "Sun, 29 Jun 2014 20:37:35 GMT", "version": "v2" }, { "created": "Thu, 18 Feb 2016 17:33:40 GMT", "version": "v3" } ]
2016-02-19
[ [ "Wu", "Youlong", "" ], [ "Wigger", "Michèle", "" ] ]
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1401.6220
Abdul Basit Memon
Abdul Basit Memon and Erik I. Verriest
Maximally persistent connections for the periodic type
Submitted to the 21st International Symposium on Mathematical Theory of Networks and Systems, Groningen, The Netherlands
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cs.SY math.OC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper considers the optimal control problem of connecting two periodic trajectories with maximal persistence. A maximally persistent trajectory is close to the periodic type in the sense that the norm of the image of this trajectory under the operator defining the periodic type is minimal among all trajectories. A solution is obtained in this paper for the case when the two trajectories have the same period but it turns out to be only piecewise continuous and so an alternate norm is employed to obtain a continuous connection. The case when the two trajectories have different but rational periods is also solved. The problem of connecting periodic trajectories is of interest because of the observation that the operating points of many biological and artificial systems are limit cycles and so there is a need for a unified optimal framework of connections between different operating points. This paper is a first step towards that goal.
[ { "created": "Fri, 24 Jan 2014 00:00:24 GMT", "version": "v1" } ]
2014-01-27
[ [ "Memon", "Abdul Basit", "" ], [ "Verriest", "Erik I.", "" ] ]
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1401.6224
Maria Kalimeri
Maria Kalimeri, Vassilios Constantoudis, Constantinos Papadimitriou, Konstantinos Karamanos, Fotis K. Diakonos and Harris Papageorgiou
Word-length entropies and correlations of natural language written texts
13 pages + 1 page of supporting information, 9 figures
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null
null
cs.CL physics.data-an
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the frequency distributions and correlations of the word lengths of ten European languages. Our findings indicate that a) the word-length distribution of short words quantified by the mean value and the entropy distinguishes the Uralic (Finnish) corpus from the others, b) the tails at long words, manifested in the high-order moments of the distributions, differentiate the Germanic languages (except for English) from the Romanic languages and Greek and c) the correlations between nearby word lengths measured by the comparison of the real entropies with those of the shuffled texts are found to be smaller in the case of Germanic and Finnish languages.
[ { "created": "Fri, 24 Jan 2014 00:26:58 GMT", "version": "v1" } ]
2014-01-27
[ [ "Kalimeri", "Maria", "" ], [ "Constantoudis", "Vassilios", "" ], [ "Papadimitriou", "Constantinos", "" ], [ "Karamanos", "Konstantinos", "" ], [ "Diakonos", "Fotis K.", "" ], [ "Papageorgiou", "Harris", "" ] ]
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1401.6226
Tunji Adebiyi
Adetunji Adebiyi, Chris Imafidon
Using Neural Network to Propose Solutions to Threats in Attack Patterns
11 Pages
International Journal of Soft Computing and Software Engineering [JSCSE], Vol. 3, No. 1, 2013
10.7321/jscse.v3.n1.1
null
cs.CR cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In the last decade, a lot of effort has been put into securing software application during development in the software industry. Software security is a research field in this area which looks at how security can be weaved into software at each phase of software development lifecycle (SDLC). The use of attack patterns is one of the approaches that have been proposed for integrating security during the design phase of SDLC. While this approach help developers in identify security flaws in their software designs, the need to apply the proper security capability that will mitigate the threat identified is very important. To assist in this area, the uses of security patterns have been proposed to help developers to identify solutions to recurring security problems. However due to different types of security patterns and their taxonomy, software developers are faced with the challenge of finding and selecting appropriate security patterns that addresses the security risks in their design. In this paper, we propose a tool based on Neural Network for proposing solutions in form of security patterns to threats in attack patterns matching attacking patterns. From the result of performance of the neural network, we found out that the neural network was able to match attack patterns to security patterns that can mitigate the threat in the attack pattern. With this information developers are better informed in making decision on the solution for securing their application.
[ { "created": "Fri, 24 Jan 2014 00:42:53 GMT", "version": "v1" } ]
2014-01-27
[ [ "Adebiyi", "Adetunji", "" ], [ "Imafidon", "Chris", "" ] ]
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1401.6227
Niki Vazou
Niki Vazou, Eric L. Seidel, Ranjit Jhala
From Safety To Termination And Back: SMT-Based Verification For Lazy Languages
null
null
null
null
cs.PL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
SMT-based verifiers have long been an effective means of ensuring safety properties of programs. While these techniques are well understood, we show that they implicitly require eager semantics; directly applying them to a lazy language is unsound due to the presence of divergent sub-computations. We recover soundness by composing the safety analysis with a termination analysis. Of course, termination is itself a challenging problem, but we show how the safety analysis can be used to ensure termination, thereby bootstrapping soundness for the entire system. Thus, while safety invariants have long been required to prove termination, we show how termination proofs can be to soundly establish safety. We have implemented our approach in liquidHaskell, a Refinement Type-based verifier for Haskell. We demonstrate its effectiveness via an experimental evaluation using liquidHaskell to verify safety, functional correctness and termination properties of real-world Haskell libraries, totaling over 10,000 lines of code.
[ { "created": "Fri, 24 Jan 2014 00:45:45 GMT", "version": "v1" } ]
2014-01-27
[ [ "Vazou", "Niki", "" ], [ "Seidel", "Eric L.", "" ], [ "Jhala", "Ranjit", "" ] ]
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1401.6231
Chang-Bae Kim
Byung-Hoon Min, Chan-Yong An and Chang-Bae Kim
A study on the turbulent transport of an advective nature in the fluid plasma
null
null
10.3938/jkps.65.471
null
physics.plasm-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Advective nature of the electrostatic turbulent flux of plasma energy is studied numerically in a nearly adiabatic state. Such a state is represented by the Hasegawa-Mima equation that is driven by a noise that may model the destabilization due to the phase mismatch of the plasma density and the electric potential. The noise is assumed to be Gaussian and not to be invariant under reflection along a direction $\hat s$. It is found that the flux density induced by such noise is anisotropic: While it is random along $\hat s$, it is not along the perpendicular direction ${\hat s}_\perp$ and the flux is not diffusive. The renormalized response may be approximated as advective with the velocity being proportional to $(k\rho_s)^2$ in the Fourier space $\vec k$.
[ { "created": "Fri, 24 Jan 2014 00:53:46 GMT", "version": "v1" } ]
2015-06-18
[ [ "Min", "Byung-Hoon", "" ], [ "An", "Chan-Yong", "" ], [ "Kim", "Chang-Bae", "" ] ]
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1401.6233
Stefan Nagele
Qi-Cheng Ning, Liang-You Peng, Shu-Na Song, Wei-Chao Jiang, Stefan Nagele, Renate Pazourek, Joachim Burgd\"orfer, Qihuang Gong
Attosecond streaking of Cohen-Fano interferences in the photoionization of H$_2^+$
null
Phys. Rev. A 90, 013423 (2014)
10.1103/PhysRevA.90.013423
null
physics.atom-ph physics.atm-clus physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present the first numerical simulation of the time delay in the photoionization of the simplest diatomic molecule H$_2^+$ as observed by attosecond streaking. We show that the strong variation of the Eisenbud-Wigner-Smith time delay as a function of energy and emission angle becomes observable in the streaking time shift provided laser field-induced components are accounted for. The strongly enhanced photoemission time shifts are traced to destructive Cohen-Fano (or two-center) interferences. Signatures of these interferences in the streaking trace are shown to be enhanced when the ionic fragments are detected in coincidence.
[ { "created": "Fri, 24 Jan 2014 00:59:47 GMT", "version": "v1" } ]
2014-07-31
[ [ "Ning", "Qi-Cheng", "" ], [ "Peng", "Liang-You", "" ], [ "Song", "Shu-Na", "" ], [ "Jiang", "Wei-Chao", "" ], [ "Nagele", "Stefan", "" ], [ "Pazourek", "Renate", "" ], [ "Burgdörfer", "Joachim", "" ], [ "Gong", "Qihuang", "" ] ]
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1401.6235
Evgeny Latkin
Evgeny Latkin
Twofold fast arithmetic
C++ experimental code and test results available via Web: https://sites.google.com/site/yevgenylatkin/
null
null
null
cs.NA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Can we assure math computations by automatic verifying floating-point accuracy? We define fast arithmetic (based on Dekker [1971]) over twofold approximations $z\approx z_0+z_1$, such that $z_0$ is standard result and $z_1$ assesses inaccuracy $\Delta z_0=z-z_0$. We propose on-fly tracking $z_1$, detecting if $\Delta z_0$ appears too high. We believe permanent tracking is worth its cost. C++ test code for Intel AVX available via web.
[ { "created": "Fri, 24 Jan 2014 01:33:54 GMT", "version": "v1" }, { "created": "Tue, 28 Jan 2014 05:58:56 GMT", "version": "v2" }, { "created": "Fri, 11 Apr 2014 04:58:06 GMT", "version": "v3" }, { "created": "Thu, 17 Apr 2014 04:28:11 GMT", "version": "v4" }, { "created": "Mon, 21 Apr 2014 07:10:44 GMT", "version": "v5" }, { "created": "Thu, 10 Jul 2014 10:35:43 GMT", "version": "v6" } ]
2014-07-11
[ [ "Latkin", "Evgeny", "" ] ]
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1401.6236
Michael Cohen
Michael B. Cohen, Rasmus Kyng, Jakub W. Pachocki, Richard Peng, Anup Rao
Preconditioning in Expectation
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null
null
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cs.DS cs.NA math.NA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We show that preconditioners constructed by random sampling can perform well without meeting the standard requirements of iterative methods. When applied to graph Laplacians, this leads to ultra-sparsifiers that in expectation behave as the nearly-optimal ones given by [Kolla-Makarychev-Saberi-Teng STOC`10]. Combining this with the recursive preconditioning framework by [Spielman-Teng STOC`04] and improved embedding algorithms, this leads to algorithms that solve symmetric diagonally dominant linear systems and electrical flow problems in expected time close to $m\log^{1/2}n$ .
[ { "created": "Fri, 24 Jan 2014 01:37:37 GMT", "version": "v1" } ]
2014-01-27
[ [ "Cohen", "Michael B.", "" ], [ "Kyng", "Rasmus", "" ], [ "Pachocki", "Jakub W.", "" ], [ "Peng", "Richard", "" ], [ "Rao", "Anup", "" ] ]
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1401.6240
Shaobo Lin
Shaobo Lin, Xia Liu, Jian Fang and Zongben Xu
Is Extreme Learning Machine Feasible? A Theoretical Assessment (Part II)
13 pages
null
null
null
cs.LG
http://creativecommons.org/licenses/by-nc-sa/3.0/
An extreme learning machine (ELM) can be regarded as a two stage feed-forward neural network (FNN) learning system which randomly assigns the connections with and within hidden neurons in the first stage and tunes the connections with output neurons in the second stage. Therefore, ELM training is essentially a linear learning problem, which significantly reduces the computational burden. Numerous applications show that such a computation burden reduction does not degrade the generalization capability. It has, however, been open that whether this is true in theory. The aim of our work is to study the theoretical feasibility of ELM by analyzing the pros and cons of ELM. In the previous part on this topic, we pointed out that via appropriate selection of the activation function, ELM does not degrade the generalization capability in the expectation sense. In this paper, we launch the study in a different direction and show that the randomness of ELM also leads to certain negative consequences. On one hand, we find that the randomness causes an additional uncertainty problem of ELM, both in approximation and learning. On the other hand, we theoretically justify that there also exists an activation function such that the corresponding ELM degrades the generalization capability. In particular, we prove that the generalization capability of ELM with Gaussian kernel is essentially worse than that of FNN with Gaussian kernel. To facilitate the use of ELM, we also provide a remedy to such a degradation. We find that the well-developed coefficient regularization technique can essentially improve the generalization capability. The obtained results reveal the essential characteristic of ELM and give theoretical guidance concerning how to use ELM.
[ { "created": "Fri, 24 Jan 2014 01:57:42 GMT", "version": "v1" } ]
2014-01-27
[ [ "Lin", "Shaobo", "" ], [ "Liu", "Xia", "" ], [ "Fang", "Jian", "" ], [ "Xu", "Zongben", "" ] ]
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1401.6241
Alexander Yukio Piggott
Alexander Y. Piggott, Konstantinos G. Lagoudakis, Tomas Sarmiento, Michal Bajcsy, Gary Shambat, and Jelena Vu\v{c}kovi\'c
Photo-oxidative tuning of individual and coupled GaAs photonic crystal cavities
4 pages, 3 figures
null
10.1364/OE.22.015017
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We demonstrate a new photo-induced oxidation technique for tuning GaAs photonic crystal cavities using a $390~\mathrm{nm}$ pulsed laser with an average power of $10~\mathrm{\mu W}$. The laser oxidizes a small $\left(\sim 500~\mathrm{nm}\right)$ diameter spot, reducing the local index of refraction and blueshifting the cavity. The tuning progress can be actively monitored in real time. We also demonstrate tuning an individual cavity within a pair of proximity-coupled cavities, showing that this method can be used to correct undesired frequency shifts caused by fabrication imperfections in cavity arrays.
[ { "created": "Fri, 24 Jan 2014 02:00:31 GMT", "version": "v1" }, { "created": "Wed, 29 Jan 2014 08:46:07 GMT", "version": "v2" }, { "created": "Thu, 30 Jan 2014 19:35:26 GMT", "version": "v3" } ]
2014-06-12
[ [ "Piggott", "Alexander Y.", "" ], [ "Lagoudakis", "Konstantinos G.", "" ], [ "Sarmiento", "Tomas", "" ], [ "Bajcsy", "Michal", "" ], [ "Shambat", "Gary", "" ], [ "Vučković", "Jelena", "" ] ]
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1401.6244
Yanqing Wang
Yanqing Wang, Hong Ge, Xiaojing Feng, Jie Yu
On measuring team stability in cooperative learning: An example of consecutive course projects on software engineering
11 pages, 3 figures, 5 tables
null
null
null
cs.CY cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Cooperative learning theory has shown that stable membership is a hallmark of effective work teams. According to relation strength and social network centrality, this paper proposes an approach to measure team stability reasons in consecutive cooperative learning. Taking consecutive course projects of software engineering in a university as examples, we examine the relation between team stability and learning performance in consecutive cooperative learning from two parts: learning score and learning satisfaction. Through empirical analysis, it arrives at the conclusion that learning score is in weak positive correlation with team stability. Through questionnaire and interviews, it finds out 78% of the students did not value the importance of team stability, and 67% of the teachers never recommend the students to keep stable teams. Finally, we put forward an expected correlation model of learning performance as future work and discuss instability as well.
[ { "created": "Fri, 24 Jan 2014 02:45:48 GMT", "version": "v1" } ]
2014-01-27
[ [ "Wang", "Yanqing", "" ], [ "Ge", "Hong", "" ], [ "Feng", "Xiaojing", "" ], [ "Yu", "Jie", "" ] ]
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1401.6248
Bowen Xiao
Yoshitaka Hatta, Jorge Noronha, Bo-Wen Xiao
Exact analytical solutions of second-order conformal hydrodynamics
5 pages, 3 figures. A few typo corrected
Phys. Rev. D 89, 051702 (2014)
10.1103/PhysRevD.89.051702
YITP-14-6
hep-th hep-ph nucl-th physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present some exact solutions of relativistic second-order hydrodynamic equations in theories with conformal symmetry. Starting from a spherically expanding solution in ideal hydrodynamics, we take into account general conformal second-order corrections, and construct, for the first time, fully analytical axisymmetric exact solutions including the case with nonzero vorticity. These solutions are time-reversible despite having a nonvanishing shear stress tensor and provide a useful quantitative measure of the second-order effects in relativistic hydrodynamics.
[ { "created": "Fri, 24 Jan 2014 03:45:02 GMT", "version": "v1" }, { "created": "Thu, 30 Jan 2014 15:58:19 GMT", "version": "v2" } ]
2014-03-26
[ [ "Hatta", "Yoshitaka", "" ], [ "Noronha", "Jorge", "" ], [ "Xiao", "Bo-Wen", "" ] ]
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