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1401.0240
Ming-Chang Chen
M.-C. Chen, C. Hern\'andez-Garc\'ia, C. Mancuso, F. Dollar, B. Galloway, D. Popmintchev, P.-C. Huang, B. Walker, L. Plaja, A. Jaron-Becker, A. Becker, T. Popmintchev, M. M. Murnane, H. C. Kapteyn
Generation of Bright Isolated Attosecond Soft X-Ray Pulses Driven by Multi-Cycle Mid-Infrared Lasers
14 pages, and 4 figures
null
10.1073/pnas.1407421111
null
physics.optics physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
High harmonic generation driven by femtosecond lasers makes it possible to capture the fastest dynamics in molecules and materials. However, to date the shortest attosecond (as) pulses have been produced only in the extreme ultraviolet (EUV) region of the spectrum below 100 eV, which limits the range of materials and molecular systems that can be explored. Here we use advanced experiment and theory to demonstrate a remarkable convergence of physics: when mid-infrared lasers are used to drive the high harmonic generation process, the conditions for optimal bright soft X-ray generation naturally coincide with the generation of isolated attosecond pulses. The temporal window over which phase matching occurs shrinks rapidly with increasing driving laser wavelength, to the extent that bright isolated attosecond pulses are the norm for 2 \mu m driving lasers. Harnessing this realization, we demonstrate the generation of isolated soft X-ray attosecond pulses at photon energies up to 180 eV for the first time, that emerge as linearly chirped 300 as pulses with a transform limit of 35 as. Most surprisingly, we find that in contrast to as pulse generation in the EUV, long-duration, multi-cycle, driving laser pulses are required to generate isolated soft X-ray bursts efficiently, to mitigate group velocity walk-off between the laser and the X-ray fields that otherwise limit the conversion efficiency. Our work demonstrates a clear and straightforward approach for robustly generating bright attosecond pulses of electromagnetic radiation throughout the soft X ray region of the spectrum.
[ { "created": "Wed, 1 Jan 2014 01:18:15 GMT", "version": "v1" } ]
2014-07-17
[ [ "Chen", "M. -C.", "" ], [ "Hernández-García", "C.", "" ], [ "Mancuso", "C.", "" ], [ "Dollar", "F.", "" ], [ "Galloway", "B.", "" ], [ "Popmintchev", "D.", "" ], [ "Huang", "P. -C.", "" ], [ "Walker", "B.", "" ], [ "Plaja", "L.", "" ], [ "Jaron-Becker", "A.", "" ], [ "Becker", "A.", "" ], [ "Popmintchev", "T.", "" ], [ "Murnane", "M. M.", "" ], [ "Kapteyn", "H. C.", "" ] ]
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1401.0242
Shulabh Gupta
Shulabh Gupta, Li Jun Jiang and Christophe Caloz
Unveiling Magnetic Dipole Radiation in Phase-Reversal Leaky-Wave Antennas
4 pages, 3 figures
null
10.1109/LAWP.2014.2317739
null
physics.class-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The radiation principle of travelling-wave type phase-reversal antennas is explained in details, unveiling the presence of magnetic-dipole radiation in addition to well-known electric dipole radiation. It is point out that such magnetic dipole radiation is specific to the case of traveling-wave phase-reversal antennas whereas only electric-dipole radiation exists in resonant-type phase-reversal antennas. It is shown that a phase-reversal travelling-wave antenna alternately operates as an array of magnetic dipoles and an array of electric-dipoles during a time-harmonic period. This radiation mechanism is confirmed through both full-wave and experimental results.
[ { "created": "Wed, 1 Jan 2014 02:15:32 GMT", "version": "v1" } ]
2015-06-18
[ [ "Gupta", "Shulabh", "" ], [ "Jiang", "Li Jun", "" ], [ "Caloz", "Christophe", "" ] ]
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1401.0245
Sujit Gath
S.J Gath and R.V Kulkarni
A Review: Expert System for Diagnosis of Myocardial Infarction
7 pages. arXiv admin note: text overlap with arXiv:1006.4544 by other authors
null
null
null
cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A computer Program Capable of performing at a human-expert level in a narrow problem domain area is called an expert system. Management of uncertainty is an intrinsically important issue in the design of expert systems because much of the information in the knowledge base of a typical expert system is imprecise, incomplete or not totally reliable. In this paper, the author present s the review of past work that has been carried out by various researchers based on development of expert systems for the diagnosis of cardiac disease
[ { "created": "Wed, 1 Jan 2014 03:59:22 GMT", "version": "v1" } ]
2014-01-03
[ [ "Gath", "S. J", "" ], [ "Kulkarni", "R. V", "" ] ]
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1401.0247
Yingyu Liang
Maria-Florina Balcan, Yingyu Liang, Pramod Gupta
Robust Hierarchical Clustering
37 pages
null
null
null
cs.LG cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
One of the most widely used techniques for data clustering is agglomerative clustering. Such algorithms have been long used across many different fields ranging from computational biology to social sciences to computer vision in part because their output is easy to interpret. Unfortunately, it is well known, however, that many of the classic agglomerative clustering algorithms are not robust to noise. In this paper we propose and analyze a new robust algorithm for bottom-up agglomerative clustering. We show that our algorithm can be used to cluster accurately in cases where the data satisfies a number of natural properties and where the traditional agglomerative algorithms fail. We also show how to adapt our algorithm to the inductive setting where our given data is only a small random sample of the entire data set. Experimental evaluations on synthetic and real world data sets show that our algorithm achieves better performance than other hierarchical algorithms in the presence of noise.
[ { "created": "Wed, 1 Jan 2014 04:16:21 GMT", "version": "v1" }, { "created": "Sun, 13 Jul 2014 01:51:05 GMT", "version": "v2" } ]
2014-07-15
[ [ "Balcan", "Maria-Florina", "" ], [ "Liang", "Yingyu", "" ], [ "Gupta", "Pramod", "" ] ]
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1401.0248
Evgeny Latkin
Evgeny Latkin
Twofold fast summation
All used tests and testing results available at author's Web site: https://sites.google.com/site/yevgenylatkin/
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cs.NA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Debugging accumulation of floating-point errors is hard; ideally, computer should track it automatically. Here we consider twofold approximation of an exact real with value + error pair of floating-point numbers. Normally, value + error sum is more accurate than value alone, so error can estimate deviation between value and its exact target. Fast summation algorithm, that provides twofold sum of x[1]+...+x[N] or dot product x[1]*y[1]+...+x[N]*y[N], can be same fast as direct summation sometimes if leveraging processor underused potential. This way, we can hit three goals: improve precision, track inaccuracy, and do this with little if any loss in performance.
[ { "created": "Wed, 1 Jan 2014 04:25:16 GMT", "version": "v1" }, { "created": "Fri, 3 Jan 2014 03:35:24 GMT", "version": "v2" } ]
2014-01-06
[ [ "Latkin", "Evgeny", "" ] ]
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1401.0255
Dinesh Govindaraj
Dinesh Govindaraj, Tao Wang, S.V.N. Vishwanathan
Modeling Attractiveness and Multiple Clicks in Sponsored Search Results
null
null
null
null
cs.IR cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Click models are an important tool for leveraging user feedback, and are used by commercial search engines for surfacing relevant search results. However, existing click models are lacking in two aspects. First, they do not share information across search results when computing attractiveness. Second, they assume that users interact with the search results sequentially. Based on our analysis of the click logs of a commercial search engine, we observe that the sequential scan assumption does not always hold, especially for sponsored search results. To overcome the above two limitations, we propose a new click model. Our key insight is that sharing information across search results helps in identifying important words or key-phrases which can then be used to accurately compute attractiveness of a search result. Furthermore, we argue that the click probability of a position as well as its attractiveness changes during a user session and depends on the user's past click experience. Our model seamlessly incorporates the effect of externalities (quality of other search results displayed in response to a user query), user fatigue, as well as pre and post-click relevance of a sponsored search result. We propose an efficient one-pass inference scheme and empirically evaluate the performance of our model via extensive experiments using the click logs of a large commercial search engine.
[ { "created": "Wed, 1 Jan 2014 06:45:58 GMT", "version": "v1" } ]
2014-01-03
[ [ "Govindaraj", "Dinesh", "" ], [ "Wang", "Tao", "" ], [ "Vishwanathan", "S. V. N.", "" ] ]
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1401.0260
Pedro Henrique Juliano Nardelli
Pedro H. J. Nardelli, Nicolas Rubido, Chengwei Wang, Murilo S. Baptista, Carlos Pomalaza-Raez, Paulo Cardieri, Matti Latva-aho
Models for the modern power grid
Submitted to EPJ-ST Power Grids, May 2015
null
10.1140/epjst/e2014-02219-6
null
cs.SY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This article reviews different kinds of models for the electric power grid that can be used to understand the modern power system, the smart grid. From the physical network to abstract energy markets, we identify in the literature different aspects that co-determine the spatio-temporal multilayer dynamics of power system. We start our review by showing how the generation, transmission and distribution characteristics of the traditional power grids are already subject to complex behaviour appearing as a result of the the interplay between dynamics of the nodes and topology, namely synchronisation and cascade effects. When dealing with smart grids, the system complexity increases even more: on top of the physical network of power lines and controllable sources of electricity, the modernisation brings information networks, renewable intermittent generation, market liberalisation, prosumers, among other aspects. In this case, we forecast a dynamical co-evolution of the smart grid and other kind of networked systems that cannot be understood isolated. This review compiles recent results that model electric power grids as complex systems, going beyond pure technological aspects. From this perspective, we then indicate possible ways to incorporate the diverse co-evolving systems into the smart grid model using, for example, network theory and multi-agent simulation.
[ { "created": "Wed, 1 Jan 2014 07:14:36 GMT", "version": "v1" }, { "created": "Mon, 14 Apr 2014 13:48:28 GMT", "version": "v2" }, { "created": "Thu, 8 May 2014 06:43:43 GMT", "version": "v3" }, { "created": "Mon, 16 Jun 2014 07:41:15 GMT", "version": "v4" } ]
2015-06-18
[ [ "Nardelli", "Pedro H. J.", "" ], [ "Rubido", "Nicolas", "" ], [ "Wang", "Chengwei", "" ], [ "Baptista", "Murilo S.", "" ], [ "Pomalaza-Raez", "Carlos", "" ], [ "Cardieri", "Paulo", "" ], [ "Latva-aho", "Matti", "" ] ]
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1401.0263
Xiongwei Zhu
Xiongwei Zhu
The Roads to LPA Based Free Electron Laser
5 pages, 2 figures
null
null
null
physics.acc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we simply outline the present status of the free electron laser and the laser plasma based accelerator, and we simply discuss the potential possible roads appearing in the accelerator community to use the laser plasma based accelerator into the field of the free electron laser.
[ { "created": "Wed, 1 Jan 2014 08:12:43 GMT", "version": "v1" } ]
2014-01-03
[ [ "Zhu", "Xiongwei", "" ] ]
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1401.0270
Aurelio Agliolo Gallitto
Rosaria Conti, Aurelio Agliolo Gallitto, Emilio Fiordilino
Measurement of the convective heat-transfer coefficient
8 pages, 2 embedded figures. Accepted for publication in The Physics Teacher
Phys. Teach. 52 (2014) 109
10.1119/1.4862118
null
physics.ed-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose an experiment for investigating how objects cool down toward the thermal equilibrium with its surrounding through convection. We describe the time dependence of the temperature difference of the cooling object and the environment with an exponential decay function. By measuring the thermal constant tau, we determine the convective heat-transfer coefficient, which is a characteristic constant of the convection system.
[ { "created": "Wed, 1 Jan 2014 10:38:03 GMT", "version": "v1" } ]
2014-01-28
[ [ "Conti", "Rosaria", "" ], [ "Gallitto", "Aurelio Agliolo", "" ], [ "Fiordilino", "Emilio", "" ] ]
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1401.0279
Darko Dimitrov
Darko Dimitrov
On structural properties of trees with minimal atom-bond connectivity index
null
null
null
null
cs.DM math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The {\em atom-bond connectivity (ABC) index} is a degree-based molecular descriptor, that found chemical applications. It is well known that among all connected graphs, the graphs with minimal ABC index are trees. A complete characterization of trees with minimal $ABC$ index is still an open problem. In this paper, we present new structural properties of trees with minimal ABC index. Our main results reveal that trees with minimal ABC index do not contain so-called {\em $B_k$-branches}, with $k \geq 5$, and that they do not have more than four $B_4$-branches.
[ { "created": "Wed, 1 Jan 2014 12:44:58 GMT", "version": "v1" } ]
2014-01-03
[ [ "Dimitrov", "Darko", "" ] ]
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1401.0281
Artem Badasyan
Artem Badasyan, Shushanik A. Tonoyan, Achille Giacometti, Rudolf Podgornik, V. Adrian Parsegian, Yevgeni Sh. Mamasakhlisov and Vladimir F. Morozov
A unified description of solvent effects in the helix-coil transition
12 pages, 12 figures, to be submitted to PRE
null
10.1103/PhysRevE.89.022723
null
q-bio.BM cond-mat.soft physics.bio-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We analyze the problem of the helix-coil transition in explicit solvents analytically by using spin-based models incorporating two different mechanisms of solvent action: explicit solvent action through the formation of solvent-polymer hydrogen bonds that can compete with the intrinsic intra-polymer hydrogen bonded configurations (competing interactions) and implicit solvent action, where the solvent-polymer interactions tune biopolymer configurations by changing the activity of the solvent (non-competing interactions). The overall spin Hamiltonian is comprised of three terms: the background \emph{in vacuo} Hamiltonian of the "Generalized Model of Polypeptide Chain" type and two additive terms that account for the two above mechanisms of solvent action. We show that on this level the solvent degrees of freedom can be {\sl explicitly} and {\sl exactly} traced over, the ensuing effective partition function combining all the solvent effects in a unified framework. In this way we are able to address helix-coil transitions for polypeptides, proteins, and DNA, with different buffers and different external constraints. Our spin-based effective Hamiltonian is applicable for treatment of such diverse phenomena as cold denaturation, effects of osmotic pressure on the cold and warm denaturation, complicated temperature dependence of the hydrophobic effect as well as providing a conceptual base for understanding the behavior of Intrinsically Disordered Proteins and their analogues.
[ { "created": "Wed, 1 Jan 2014 13:29:29 GMT", "version": "v1" } ]
2015-06-18
[ [ "Badasyan", "Artem", "" ], [ "Tonoyan", "Shushanik A.", "" ], [ "Giacometti", "Achille", "" ], [ "Podgornik", "Rudolf", "" ], [ "Parsegian", "V. Adrian", "" ], [ "Mamasakhlisov", "Yevgeni Sh.", "" ], [ "Morozov", "Vladimir F.", "" ] ]
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1401.0282
Reza Nourjou
Reza Nourjou, Michinori Hatayama, Stephen F. Smith, Atabak Sadeghi and Pedro Szekely
Design of a GIS-based Assistant Software Agent for the Incident Commander to Coordinate Emergency Response Operations
3 pages, 1 figure, In Workshop on Robots and Sensors integration in future rescue INformation system (ROSIN' 13). In Conjunction of the IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS' 13), 2013
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null
null
cs.MA cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Problem: This paper addresses the design of an intelligent software system for the IC (incident commander) of a team in order to coordinate actions of agents (field units or robots) in the domain of emergency/crisis response operations. Objective: This paper proposes GICoordinator. It is a GIS-based assistant software agent that assists and collaborates with the human planner in strategic planning and macro tasks assignment for centralized multi-agent coordination. Method: Our approach to design GICoordinator was to: analyze the problem, design a complete data model, design an architecture of GICoordinator, specify required capabilities of human and system in coordination problem solving, specify development tools, and deploy. Result: The result was an architecture/design of GICoordinator that contains system requirements. Findings: GICoordinator efficiently integrates geoinformatics with artifice intelligent techniques in order to provide a spatial intelligent coordinator system for an IC to efficiently coordinate and control agents by making macro/strategic decisions. Results define a framework for future works to develop this system.
[ { "created": "Wed, 1 Jan 2014 13:35:06 GMT", "version": "v1" } ]
2014-01-03
[ [ "Nourjou", "Reza", "" ], [ "Hatayama", "Michinori", "" ], [ "Smith", "Stephen F.", "" ], [ "Sadeghi", "Atabak", "" ], [ "Szekely", "Pedro", "" ] ]
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1401.0293
Helge Kragh
Helge Kragh
Photon: New light on an old name
16 pages; 4 figures
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null
null
physics.hist-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
After G. N. Lewis (1875-1946) proposed the term "photon" in 1926, many physicists adopted it as a more apt name for Einstein's light quantum. However, Lewis' photon was a concept of a very different kind, something few physicists knew or cared about. It turns out that Lewis' name was not quite the neologism that it has usually been assumed to be. The same name was proposed or used earlier, apparently independently, by at least four scientists. Three of the four early proposals were related to physiology or visual perception, and only one to quantum physics. Priority belongs to the American physicist and psychologist L. T. Troland (1889-1932), who coined the word in 1916, and five years later it was independently introduced by the Irish physicist J. Joly (1857-1933). Then in 1925 a French physiologist, Rene Wurmser (1890-1993), wrote about the photon, and in July 1926 his compatriot, the physicist F. Wolfers (ca. 1890-1971), did the same in the context of optical physics. None of the four pre-Lewis versions of "photon" was well known and they were soon forgotten.
[ { "created": "Wed, 1 Jan 2014 15:19:18 GMT", "version": "v1" }, { "created": "Fri, 3 Jan 2014 08:21:54 GMT", "version": "v2" }, { "created": "Fri, 28 Feb 2014 07:39:43 GMT", "version": "v3" } ]
2014-03-03
[ [ "Kragh", "Helge", "" ] ]
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1401.0294
Vadim E. Levit
Vadim E. Levit and David Tankus
Complexity results for generating subgraphs
18 pages, 3 figures, 1 table. arXiv admin note: text overlap with arXiv:1312.7563
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cs.DM math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A graph G is well-covered if all its maximal independent sets are of the same cardinality. Assume that a weight function w is defined on its vertices. Then G is w-well-covered if all maximal independent sets are of the same weight. For every graph G, the set of weight functions w such that G is w-well-covered is a vector space, denoted WCW(G). Let B be a complete bipartite induced subgraph of G on vertex sets of bipartition B_X and B_Y. Then B is generating if there exists an independent set S such that S \cup B_X and S \cup B_Y are both maximal independent sets of G. A relating edge is a generating subgraph in the restricted case that B = K_{1,1}. Deciding whether an input graph G is well-covered is co-NP-complete. Therefore finding WCW(G) is co-NP-hard. Deciding whether an edge is relating is co-NP-complete. Therefore, deciding whether a subgraph is generating is co-NP-complete as well. In this article we discuss the connections among these problems, provide proofs for NP-completeness for several restricted cases, and present polynomial characterizations for some other cases.
[ { "created": "Wed, 1 Jan 2014 15:20:17 GMT", "version": "v1" }, { "created": "Sun, 20 Nov 2016 12:56:29 GMT", "version": "v2" } ]
2016-11-22
[ [ "Levit", "Vadim E.", "" ], [ "Tankus", "David", "" ] ]
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1401.0297
Pratim Kumar Chattaraj
Ranjita Das and Pratim Kumar Chattaraj
Gas Storage Potential of Li-decorated ExBox4+
null
null
null
null
physics.atm-clus
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The newly developed compound ExBox4+ is explored to check whether it is a proficient hydrogen storage material. Both exoherdal and endohedral hydrogen adsorption on ExBox4+ are studied. Endohedral hydrogen molecules interact strongly than exohedral ones. The hydrogen adsorption energy is as good as the recently studied charged fullerenes. The hydrogen storage capacity appears to be ~4.3 wt%. The endohedral CO sorption is also analysed with the help of DFT. The first principle DFT calculation and MD simulation are performed to investigate the effect of lithium doping on the gas adsorbing capacity and adsorption enthalpy as well as adsorption energy of ExBox4+.The metal atom interaction with ExBox4+is found to be pretty strong, and the interaction energy appears to be higher than the metal cohesive energy.The thermodynamic parameters suggest that metal doping method is spontaneous in nature. The analysis of adsorption energy, thermodynamic properties and MD simulation results suggest that Li doped ExBox4+ can be a promising gas adsorbing material. Lithium doping increases the gas adsorption capacity of ExBox4+. The Li decorated ExBox4+ is found to adsorb twenty four hydrogen molecules with a gravimetric wt% of 6.23. Adsorption of CO on the metal decorated ExBox4+ is also studied. AIM analysis is performed to obtain a general idea of the bonding interaction between Li-H and Li-C.
[ { "created": "Wed, 1 Jan 2014 15:46:40 GMT", "version": "v1" } ]
2014-01-03
[ [ "Das", "Ranjita", "" ], [ "Chattaraj", "Pratim Kumar", "" ] ]
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1401.0302
Yinan Yu
Yinan Yu, Shawn Mitryk, Guido Mueller
Arm locking for space-based laser interferometry gravitational wave observatories
18 pages
null
10.1103/PhysRevD.90.062005
null
gr-qc astro-ph.IM physics.ins-det
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Laser frequency stabilization is a critical part of the interferometry measurement system of space-based gravitational wave observatories such as the Laser Interferometer Space Antenna (LISA). Arm locking as a proposed frequency stabilization technique, transfers the stability of the long arm lengths to the laser frequency. The arm locking sensor synthesizes an adequately filtered linear combination of the inter-spacecraft phase measurements to estimate the laser frequency noise, which can be used to control the laser frequency. At the University of Florida we developed the hardware-based University of Florida LISA Interferometer Simulator (UFLIS) to study and verify laser frequency noise reduction and suppression techniques under realistic LISA-like conditions. These conditions include the variable Doppler shifts between the spacecraft, LISA-like signal travel times, optical transponders, realistic laser frequency and timing noise. We review the different types of arm locking sensors and discuss their expected performance in LISA. The presented results are supported by results obtained during experimental studies of arm locking under relevant LISA-like conditions. We measured the noise suppression as well as initial transients and frequency pulling in the presence of Doppler frequency errors. This work has demonstrated the validity and \ feasibility of arm locking in LISA.
[ { "created": "Wed, 1 Jan 2014 16:20:29 GMT", "version": "v1" }, { "created": "Wed, 8 Jan 2014 18:14:11 GMT", "version": "v2" } ]
2015-06-18
[ [ "Yu", "Yinan", "" ], [ "Mitryk", "Shawn", "" ], [ "Mueller", "Guido", "" ] ]
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1401.0304
Shahar Mendelson
Shahar Mendelson
Learning without Concentration
null
null
null
null
cs.LG stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We obtain sharp bounds on the performance of Empirical Risk Minimization performed in a convex class and with respect to the squared loss, without assuming that class members and the target are bounded functions or have rapidly decaying tails. Rather than resorting to a concentration-based argument, the method used here relies on a `small-ball' assumption and thus holds for classes consisting of heavy-tailed functions and for heavy-tailed targets. The resulting estimates scale correctly with the `noise level' of the problem, and when applied to the classical, bounded scenario, always improve the known bounds.
[ { "created": "Wed, 1 Jan 2014 16:28:19 GMT", "version": "v1" }, { "created": "Wed, 22 Oct 2014 17:59:50 GMT", "version": "v2" } ]
2014-10-23
[ [ "Mendelson", "Shahar", "" ] ]
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1401.0323
Tian Wang
Tian Wang, Hamid Krim, Yannis Viniotis
Analysis and Control of Beliefs in Social Networks
null
null
10.1109/TSP.2014.2352591
null
cs.SI physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we investigate the problem of how beliefs diffuse among members of social networks. We propose an information flow model (IFM) of belief that captures how interactions among members affect the diffusion and eventual convergence of a belief. The IFM model includes a generalized Markov Graph (GMG) model as a social network model, which reveals that the diffusion of beliefs depends heavily on two characteristics of the social network characteristics, namely degree centralities and clustering coefficients. We apply the IFM to both converged belief estimation and belief control strategy optimization. The model is compared with an IFM including the Barabasi-Albert model, and is evaluated via experiments with published real social network data.
[ { "created": "Wed, 1 Jan 2014 19:22:14 GMT", "version": "v1" }, { "created": "Fri, 3 Jan 2014 01:48:10 GMT", "version": "v2" } ]
2015-06-18
[ [ "Wang", "Tian", "" ], [ "Krim", "Hamid", "" ], [ "Viniotis", "Yannis", "" ] ]
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1401.0332
Himadri Pathak
Himadri Pathak, B. K. Sahoo, B. P. Das, Nayana Vaval, Sourav Pal
Relativistic Equation of Motion Coupled-Cluster Method: Application to the closed-shell atomic systems
null
PhysRevA.89.042510,(2014)
10.1103/PhysRevA.89.042510
null
physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We report our successful implementation of the full fledged relativistic equation of motion coupled cluster (EOMCC) method. This method is employed to compute the principal ionization potentials (IPs) of closed-shell rare gas atoms, He-like ions, Be-like ions along with Na+, Al+, K+, Be, and Mg. Four component Dirac spinors are used in the calculations and the one and two electron integrals are evaluated using the Dirac Coulomb Hamiltonian. Our results are in excellent agreement with those available measurements, which are taken from the National Institute of Science and Technology database (NIST). We also present results using the second order many-body perturbation theory (MBPT(2)) and random phase approximation (RPA) in the EOMCC framework. These results are compared with those of EOMCC at the level of single and double excitations in order to assess the role of the electron correlation effects in the intermediate schemes considered in our calculations .
[ { "created": "Wed, 1 Jan 2014 21:11:37 GMT", "version": "v1" }, { "created": "Sun, 5 Jan 2014 21:45:44 GMT", "version": "v2" }, { "created": "Wed, 8 Jan 2014 06:54:08 GMT", "version": "v3" } ]
2014-04-24
[ [ "Pathak", "Himadri", "" ], [ "Sahoo", "B. K.", "" ], [ "Das", "B. P.", "" ], [ "Vaval", "Nayana", "" ], [ "Pal", "Sourav", "" ] ]
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1401.0333
Kiran Sankar Maiti
Kiran Sankar Maiti and Christoph Scheurer
Vibrational Spectroscopy of Methyl benzoate
11 pages, 8 figures
null
null
null
physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Methyl benzoate (MB) is studied as a model compound for the development of new IR pulse schemes with possible applicability to biomolecules. Anharmonic vibrational modes of MB are calculated on different level (MP2, SCS, CCSD(T) with varying basis sets) ab-initio PESs using the vibrational self-consistent field (VSCF) method and its correlation corrected extensions. Dual level schemes, combining different quantum chemical methods for diagonal and coupling potentials, are systematically studied and applied successfully to reduce the computational cost. Isotopic substitution of {\beta}-hydrogen by deuterium is studied to obtain a better understanding of the molecular vibrational coupling topology.
[ { "created": "Wed, 1 Jan 2014 21:12:53 GMT", "version": "v1" } ]
2014-01-03
[ [ "Maiti", "Kiran Sankar", "" ], [ "Scheurer", "Christoph", "" ] ]
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1401.0336
Rachel Cummings
Rachel Cummings, Federico Echenique, Adam Wierman
The Empirical Implications of Privacy-Aware Choice
null
null
null
null
cs.GT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper initiates the study of the testable implications of choice data in settings where agents have privacy preferences. We adapt the standard conceptualization of consumer choice theory to a situation where the consumer is aware of, and has preferences over, the information revealed by her choices. The main message of the paper is that little can be inferred about consumers' preferences once we introduce the possibility that the consumer has concerns about privacy. This holds even when consumers' privacy preferences are assumed to be monotonic and separable. This motivates the consideration of stronger assumptions and, to that end, we introduce an additive model for privacy preferences that does have testable implications.
[ { "created": "Wed, 1 Jan 2014 21:17:22 GMT", "version": "v1" } ]
2014-01-03
[ [ "Cummings", "Rachel", "" ], [ "Echenique", "Federico", "" ], [ "Wierman", "Adam", "" ] ]
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1401.0340
Ahmed El Shafie
Ahmed El Shafie
Optimal Random Access and Random Spectrum Sensing for an Energy Harvesting Cognitive Radio with and without Primary Feedback Leveraging
ACCEPTED in EAI Endorsed Transactions on Cognitive Communications. arXiv admin note: substantial text overlap with arXiv:1208.5659
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cs.IT cs.NI math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider a secondary user (SU) with energy harvesting capability. We design access schemes for the SU which incorporate random spectrum sensing and random access, and which make use of the primary automatic repeat request (ARQ) feedback. We study two problem-formulations. In the first problem-formulation, we characterize the stability region of the proposed schemes. The sensing and access probabilities are obtained such that the secondary throughput is maximized under the constraints that both the primary and secondary queues are stable. Whereas in the second problem-formulation, the sensing and access probabilities are obtained such that the secondary throughput is maximized under the stability of the primary queue and that the primary queueing delay is kept lower than a specified value needed to guarantee a certain quality of service (QoS) for the primary user (PU). We consider spectrum sensing errors and assume multipacket reception (MPR) capabilities. Numerical results show the enhanced performance of our proposed systems.
[ { "created": "Wed, 1 Jan 2014 22:08:31 GMT", "version": "v1" }, { "created": "Sat, 4 Jan 2014 10:27:35 GMT", "version": "v2" }, { "created": "Sun, 27 Apr 2014 11:35:14 GMT", "version": "v3" } ]
2014-04-29
[ [ "Shafie", "Ahmed El", "" ] ]
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1401.0346
Dmitry Shcherbakov L
D. Shcherbakov, K. Motovilov, I. Erofeev, A. Astafiev
Optical control of cardiac cell excitability based on two-photon infrared absorption of AzoTAB
null
null
null
null
physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Recent studies of AzoTAB activity in excitable cell cultures have shown that this substance is able to control excitability depending on isomer, cis or trans, predominating in the cellular membrane. Control of isomerization can be performed noninvasively by UV-visual radiation. At the same time it is well-known that azobenezenes can be effectively transformed from one isomer into another by two-photon absorption. Current work is devoted to the study of trans-AzoTAB two-photon transformation in aqueous solution and inside primal neonatal contractive rat cardiomyocytes. In accordance with results obtained Azo-TAB can be used as a probe for two-photon optical control of cardiac excitability.
[ { "created": "Wed, 1 Jan 2014 22:52:18 GMT", "version": "v1" } ]
2014-01-03
[ [ "Shcherbakov", "D.", "" ], [ "Motovilov", "K.", "" ], [ "Erofeev", "I.", "" ], [ "Astafiev", "A.", "" ] ]
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1401.0347
Rodrigo de Lamare
Peng Li and Rodrigo C. de Lamare
Distributed Iterative Detection Based on Reduced Message Passing for Networked MIMO Cellular Systems
9 pages, 6 figures. IEEE Transactions on Vehicular Technology, 2014
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper considers base station cooperation (BSC) strategies for the uplink of a multi-user multi-cell high frequency reuse scenario where distributed iterative detection (DID) schemes with soft/hard interference cancellation algorithms are studied. The conventional distributed detection scheme exchanges {soft symbol estimates} with all cooperating BSs. Since a large amount of information needs to be shared via the backhaul, the exchange of hard bit information is preferred, however a performance degradation is experienced. In this paper, we consider a reduced message passing (RMP) technique in which each BS generates a detection list with the probabilities for the desired symbol that are sorted according to the calculated probability. The network then selects the best {detection candidates} from the lists and conveys the index of the constellation symbols (instead of double-precision values) among the cooperating cells. The proposed DID-RMP achieves an inter-cell-interference (ICI) suppression with low backhaul traffic overhead compared with {the conventional soft bit exchange} and outperforms the previously reported hard/soft information exchange algorithms.
[ { "created": "Wed, 1 Jan 2014 23:10:48 GMT", "version": "v1" } ]
2014-01-03
[ [ "Li", "Peng", "" ], [ "de Lamare", "Rodrigo C.", "" ] ]
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1401.0348
Henry Cohn
Nir Bitansky, Ran Canetti, Henry Cohn, Shafi Goldwasser, Yael Tauman Kalai, Omer Paneth, Alon Rosen
The impossibility of obfuscation with auxiliary input or a universal simulator
19 pages
null
null
null
cs.CR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we show that the existence of general indistinguishability obfuscators conjectured in a few recent works implies, somewhat counterintuitively, strong impossibility results for virtual black box obfuscation. In particular, we show that indistinguishability obfuscation for all circuits implies: * The impossibility of average-case virtual black box obfuscation with auxiliary input for any circuit family with super-polynomial pseudo-entropy. Such circuit families include all pseudo-random function families, and all families of encryption algorithms and randomized digital signatures that generate their required coin flips pseudo-randomly. Impossibility holds even when the auxiliary input depends only on the public circuit family, and not the specific circuit in the family being obfuscated. * The impossibility of average-case virtual black box obfuscation with a universal simulator (with or without any auxiliary input) for any circuit family with super-polynomial pseudo-entropy. These bounds significantly strengthen the impossibility results of Goldwasser and Kalai (STOC 2005).
[ { "created": "Wed, 1 Jan 2014 23:18:36 GMT", "version": "v1" }, { "created": "Sun, 5 Jan 2014 03:47:42 GMT", "version": "v2" }, { "created": "Thu, 13 Feb 2014 04:58:39 GMT", "version": "v3" } ]
2014-02-14
[ [ "Bitansky", "Nir", "" ], [ "Canetti", "Ran", "" ], [ "Cohn", "Henry", "" ], [ "Goldwasser", "Shafi", "" ], [ "Kalai", "Yael Tauman", "" ], [ "Paneth", "Omer", "" ], [ "Rosen", "Alon", "" ] ]
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1401.0355
Liya Fan
Liya Fan, Bo Gao, Xi Sun, Fa Zhang and Zhiyong Liu
Improving the Load Balance of MapReduce Operations based on the Key Distribution of Pairs
null
null
null
null
cs.DC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Load balance is important for MapReduce to reduce job duration, increase parallel efficiency, etc. Previous work focuses on coarse-grained scheduling. This study concerns fine-grained scheduling on MapReduce operations. Each operation represents one invocation of the Map or Reduce function. Scheduling MapReduce operations is difficult due to highly screwed operation loads, no support to collect workload statistics, and high complexity of the scheduling problem. So current implementations adopt simple strategies, leading to poor load balance. To address these difficulties, we design an algorithm to schedule operations based on the key distribution of intermediate pairs. The algorithm involves a sub-program for selecting operations for task slots, and we name it the Balanced Subset Sum (BSS) problem. We discuss properties of BSS and design exact and approximation algorithms for it. To transparently incorporate these algorithms into MapReduce, we design a communication mechanism to collect statistics, and a pipeline within Reduce tasks to increase resource utilization. To the best of our knowledge, this is the first work on scheduling MapReduce workload at this fine-grained level. Experiments on PUMA [T+12] benchmarks show consistent performance improvement. The job duration can be reduced by up to 37%, compared with standard MapReduce.
[ { "created": "Thu, 2 Jan 2014 01:42:23 GMT", "version": "v1" }, { "created": "Mon, 14 Apr 2014 03:35:22 GMT", "version": "v2" } ]
2014-04-15
[ [ "Fan", "Liya", "" ], [ "Gao", "Bo", "" ], [ "Sun", "Xi", "" ], [ "Zhang", "Fa", "" ], [ "Liu", "Zhiyong", "" ] ]
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1401.0359
Andrew Winslow
Benjamin Hescott, Caleb Malchik, Andrew Winslow
Tight Bounds for Active Self-Assembly Using an Insertion Primitive
To appear in Algorithmica. An abstract (12-page) version of this paper appeared in the proceedings of ESA 2014
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null
null
cs.FL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We prove two tight bounds on the behavior of a model of self-assembling particles introduced by Dabby and Chen (SODA 2013), called insertion systems, where monomers insert themselves into the middle of a growing linear polymer. First, we prove that the expressive power of these systems is equal to context-free grammars, answering a question posed by Dabby and Chen. Second, we prove that systems of $k$ monomer types can deterministically construct polymers of length $n = 2^{\Theta(k^{3/2})}$ in $O(\log^{5/3}(n))$ expected time, and that this is optimal in both the number of monomer types and expected time.
[ { "created": "Thu, 2 Jan 2014 02:50:43 GMT", "version": "v1" }, { "created": "Tue, 21 Jan 2014 19:39:28 GMT", "version": "v2" }, { "created": "Mon, 5 May 2014 18:20:05 GMT", "version": "v3" }, { "created": "Tue, 1 Jul 2014 18:38:13 GMT", "version": "v4" }, { "created": "Tue, 27 Oct 2015 20:59:17 GMT", "version": "v5" } ]
2015-10-29
[ [ "Hescott", "Benjamin", "" ], [ "Malchik", "Caleb", "" ], [ "Winslow", "Andrew", "" ] ]
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1401.0362
Hao Peng
Hao Peng and Yuan Qi
EigenGP: Gaussian Process Models with Adaptive Eigenfunctions
Accepted by IJCAI 2015
null
null
null
cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Gaussian processes (GPs) provide a nonparametric representation of functions. However, classical GP inference suffers from high computational cost for big data. In this paper, we propose a new Bayesian approach, EigenGP, that learns both basis dictionary elements--eigenfunctions of a GP prior--and prior precisions in a sparse finite model. It is well known that, among all orthogonal basis functions, eigenfunctions can provide the most compact representation. Unlike other sparse Bayesian finite models where the basis function has a fixed form, our eigenfunctions live in a reproducing kernel Hilbert space as a finite linear combination of kernel functions. We learn the dictionary elements--eigenfunctions--and the prior precisions over these elements as well as all the other hyperparameters from data by maximizing the model marginal likelihood. We explore computational linear algebra to simplify the gradient computation significantly. Our experimental results demonstrate improved predictive performance of EigenGP over alternative sparse GP methods as well as relevance vector machine.
[ { "created": "Thu, 2 Jan 2014 03:12:28 GMT", "version": "v1" }, { "created": "Tue, 25 Mar 2014 03:50:33 GMT", "version": "v2" }, { "created": "Mon, 13 Jul 2015 06:11:18 GMT", "version": "v3" } ]
2015-07-14
[ [ "Peng", "Hao", "" ], [ "Qi", "Yuan", "" ] ]
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EigenGP: Gaussian Process Models with Adaptive Eigenfunctions
http://arxiv.org/abs/1401.0362v3
http://arxiv.org/pdf/1401.0362v3.pdf
https://github.com/hao-peng/EigenGP
true
false
https://paperswithcode.com/paper/eigengp-gaussian-process-models-with-adaptive
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1401.0366
Vaisagh Viswanathan
Vaisagh Viswanathan and Chong Eu Lee and Michael Harold Lees and Siew Ann Cheong and Peter M. A. Sloot
Quantitative Comparison Between Crowd Models for Evacuation Planning and Evaluation
12 pages, 25 figures, accepted in EPJ B
null
10.1140/epjb/e2014-40699-x
null
cs.MA cs.CY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Crowd simulation is rapidly becoming a standard tool for evacuation planning and evaluation. However, the many crowd models in the literature are structurally different, and few have been rigorously calibrated against real-world egress data, especially in emergency situations. In this paper we describe a procedure to quantitatively compare different crowd models or between models and real-world data. We simulated three models: (1) the lattice gas model, (2) the social force model, and (3) the RVO2 model, and obtained the distributions of six observables: (1) evacuation time, (2) zoned evacuation time, (3) passage density, (4) total distance traveled, (5) inconvenience, and (6) flow rate. We then used the DISTATIS procedure to compute the compromise matrix of statistical distances between the three models. Projecting the three models onto the first two principal components of the compromise matrix, we find the lattice gas and RVO2 models are similar in terms of the evacuation time, passage density, and flow rates, whereas the social force and RVO2 models are similar in terms of the total distance traveled. Most importantly, we find that the zoned evacuation times of the three models to be very different from each other. Thus we propose to use this variable, if it can be measured, as the key test between different models, and also between models and the real world. Finally, we compared the model flow rates against the flow rate of an emergency evacuation during the May 2008 Sichuan earthquake, and found the social force model agrees best with this real data.
[ { "created": "Thu, 2 Jan 2014 04:44:20 GMT", "version": "v1" }, { "created": "Fri, 10 Jan 2014 06:02:51 GMT", "version": "v2" } ]
2014-02-05
[ [ "Viswanathan", "Vaisagh", "" ], [ "Lee", "Chong Eu", "" ], [ "Lees", "Michael Harold", "" ], [ "Cheong", "Siew Ann", "" ], [ "Sloot", "Peter M. A.", "" ] ]
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1401.0367
Jianwen Dong
Wen-Jie Chen, Shao-Ji Jiang, Xiao-Dong Chen, Jian-Wen Dong, C. T. Chan
Experimental realization of photonic topological insulator in a uniaxial metacrystal waveguide
8 pages, 4 figures
Nature Communications 5, 5782 (2014)
10.1038/ncomms6782
null
physics.optics cond-mat.mes-hall
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Achieving robust transport has attracted much attention in both electronic and photonic systems. Time-reversal invariant photonic crystal can be employed to realize backscattering-immune chiral state, but the chiral bandgap is topologically trivial. Here, we designed and fabricated a metacrystal comprising non-resonant meta-atoms sandwiched between two metallic plates and the system exhibits topological phase transition as established by group classification. The nontrivial bandgap was confirmed by experimentally measured transmission spectra, calculated nonzero spin Chern number and Z2 index. Gapless spin-filtered edge states were demonstrated experimentally by measuring the magnitude and phase of the fields. The transpsort robustness of the edge states were also observed when an obstacle is introduced near the edge.
[ { "created": "Thu, 2 Jan 2014 05:43:02 GMT", "version": "v1" } ]
2016-02-11
[ [ "Chen", "Wen-Jie", "" ], [ "Jiang", "Shao-Ji", "" ], [ "Chen", "Xiao-Dong", "" ], [ "Dong", "Jian-Wen", "" ], [ "Chan", "C. T.", "" ] ]
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1401.0376
Chao Zhang
Chao Zhang, Lei Zhang, Wei Fan, Jieping Ye
Generalization Bounds for Representative Domain Adaptation
arXiv admin note: substantial text overlap with arXiv:1304.1574
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cs.LG stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we propose a novel framework to analyze the theoretical properties of the learning process for a representative type of domain adaptation, which combines data from multiple sources and one target (or briefly called representative domain adaptation). In particular, we use the integral probability metric to measure the difference between the distributions of two domains and meanwhile compare it with the H-divergence and the discrepancy distance. We develop the Hoeffding-type, the Bennett-type and the McDiarmid-type deviation inequalities for multiple domains respectively, and then present the symmetrization inequality for representative domain adaptation. Next, we use the derived inequalities to obtain the Hoeffding-type and the Bennett-type generalization bounds respectively, both of which are based on the uniform entropy number. Moreover, we present the generalization bounds based on the Rademacher complexity. Finally, we analyze the asymptotic convergence and the rate of convergence of the learning process for representative domain adaptation. We discuss the factors that affect the asymptotic behavior of the learning process and the numerical experiments support our theoretical findings as well. Meanwhile, we give a comparison with the existing results of domain adaptation and the classical results under the same-distribution assumption.
[ { "created": "Thu, 2 Jan 2014 07:32:01 GMT", "version": "v1" } ]
2014-01-03
[ [ "Zhang", "Chao", "" ], [ "Zhang", "Lei", "" ], [ "Fan", "Wei", "" ], [ "Ye", "Jieping", "" ] ]
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1401.0379
Pierre Lescanne
Katarzyna Grygiel, Pierre Lescanne (LIP)
Counting Terms in the Binary Lambda Calculus
null
null
null
null
cs.LO cs.DM cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In a paper entitled Binary lambda calculus and combinatory logic, John Tromp presents a simple way of encoding lambda calculus terms as binary sequences. In what follows, we study the numbers of binary strings of a given size that represent lambda terms and derive results from their generating functions, especially that the number of terms of size n grows roughly like 1.963447954^n.
[ { "created": "Thu, 2 Jan 2014 07:43:54 GMT", "version": "v1" } ]
2014-01-03
[ [ "Grygiel", "Katarzyna", "", "LIP" ], [ "Lescanne", "Pierre", "", "LIP" ] ]
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1401.0380
Jeng-Da Chai
Jeng-Da Chai
Thermally-assisted-occupation density functional theory with generalized-gradient approximations
27 pages, 15 figures, 3 tables, supplementary material not included. This is an extension of our previous work [e.g., see arXiv:1201.4866]
J. Chem. Phys. 140, 18A521 (2014)
10.1063/1.4867532
null
physics.chem-ph cond-mat.mtrl-sci cond-mat.str-el physics.atm-clus physics.comp-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We extend the recently proposed thermally-assisted-occupation density functional theory (TAO-DFT) [J.-D. Chai, J. Chem. Phys. 136, 154104 (2012)] to generalized-gradient approximation (GGA) exchange-correlation density functionals. Relative to our previous TAO-LDA (i.e., the local density approximation to TAO-DFT), the resulting TAO-GGAs are significantly superior for a wide range of applications, such as thermochemistry, kinetics, and reaction energies. For noncovalent interactions, TAO-GGAs with empirical dispersion corrections are shown to yield excellent performance. Due to their computational efficiency for systems with strong static correlation effects, TAO-LDA and TAO-GGAs are applied to study the electronic properties (e.g., the singlet-triplet energy gaps, vertical ionization potentials, vertical electron affinities, fundamental gaps, and symmetrized von Neumann entropy) of acenes with different number of linearly fused benzene rings (up to 100), which is very challenging for conventional electronic structure methods. The ground states of acenes are shown to be singlets for all the chain lengths studied here. With the increase of acene length, the singlet-triplet energy gaps, vertical ionization potentials, and fundamental gaps decrease monotonically, while the vertical electron affinities and symmetrized von Neumann entropy (i.e., a measure of polyradical character) increase monotonically.
[ { "created": "Thu, 2 Jan 2014 07:48:17 GMT", "version": "v1" }, { "created": "Thu, 13 Feb 2014 19:24:41 GMT", "version": "v2" } ]
2015-06-18
[ [ "Chai", "Jeng-Da", "" ] ]
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1401.0387
Giovanni Bussi
Cameron Abrams and Giovanni Bussi
Enhanced Sampling in Molecular Dynamics Using Metadynamics, Replica-Exchange, and Temperature-Acceleration
Accepted for publication on Entropy
C. Abrams and G. Bussi, Entropy 16, 163 (2014)
10.3390/e16010163
null
cond-mat.stat-mech physics.chem-ph physics.comp-ph
http://creativecommons.org/licenses/by/3.0/
We review a selection of methods for performing enhanced sampling in molecular dynamics simulations. We consider methods based on collective variable biasing and on tempering, and offer both historical and contemporary perspectives. In collective-variable biasing, we first discuss methods stemming from thermodynamic integration that use mean force biasing, including the adaptive biasing force algorithm and temperature acceleration. We then turn to methods that use bias potentials, including umbrella sampling and metadynamics. We next consider parallel tempering and replica-exchange methods. We conclude with a brief presentation of some combination methods.
[ { "created": "Thu, 2 Jan 2014 08:30:03 GMT", "version": "v1" } ]
2014-01-03
[ [ "Abrams", "Cameron", "" ], [ "Bussi", "Giovanni", "" ] ]
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1401.0395
Trupti Kodinariya prof
Trupti M. Kodinariya
Hybrid Approach to Face Recognition System using Principle component and Independent component with score based fusion process
null
null
null
null
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Hybrid approach has a special status among Face Recognition Systems as they combine different recognition approaches in an either serial or parallel to overcome the shortcomings of individual methods. This paper explores the area of Hybrid Face Recognition using score based strategy as a combiner/fusion process. In proposed approach, the recognition system operates in two modes: training and classification. Training mode involves normalization of the face images (training set), extracting appropriate features using Principle Component Analysis (PCA) and Independent Component Analysis (ICA). The extracted features are then trained in parallel using Back-propagation neural networks (BPNNs) to partition the feature space in to different face classes. In classification mode, the trained PCA BPNN and ICA BPNN are fed with new face image(s). The score based strategy which works as a combiner is applied to the results of both PCA BPNN and ICA BPNN to classify given new face image(s) according to face classes obtained during the training mode. The proposed approach has been tested on ORL and other face databases; the experimented results show that the proposed system has higher accuracy than face recognition systems using single feature extractor.
[ { "created": "Thu, 2 Jan 2014 09:21:24 GMT", "version": "v1" } ]
2014-01-03
[ [ "Kodinariya", "Trupti M.", "" ] ]
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1401.0396
Marek Piotr\'ow
Marek Piotr\'ow
Faster 3-Periodic Merging Networks
null
null
null
null
cs.DS cs.DC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider the problem of merging two sorted sequences on a comparator network that is used repeatedly, that is, if the output is not sorted, the network is applied again using the output as input. The challenging task is to construct such networks of small depth. The first constructions of merging networks with a constant period were given by Kuty{\l}owski, Lory\'s and Oesterdikhoff. They have given $3$-periodic network that merges two sorted sequences of $N$ numbers in time $12\log N$ and a similar network of period $4$ that works in $5.67\log N$. We present a new family of such networks that are based on Canfield and Williamson periodic sorter. Our $3$-periodic merging networks work in time upper-bounded by $6\log N$. The construction can be easily generalized to larger constant periods with decreasing running time, for example, to $4$-periodic ones that work in time upper-bounded by $4\log N$. Moreover, to obtain the facts we have introduced a new proof technique.
[ { "created": "Thu, 2 Jan 2014 09:24:17 GMT", "version": "v1" } ]
2014-01-03
[ [ "Piotrów", "Marek", "" ] ]
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1401.0400
Simon Schmidt
Gabriel Renault and Simon Schmidt
On the Complexity of the Mis\`ere Version of Three Games Played on Graphs
null
null
null
null
cs.DM math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We investigate the complexity of finding a winning strategy for the mis\`ere version of three games played on graphs : two variants of the game $\text{NimG}$, introduced by Stockmann in 2004 and the game $\text{Vertex Geography}$ on both directed and undirected graphs. We show that on general graphs those three games are $\text{PSPACE}$-Hard or Complete. For one $\text{PSPACE}$-Hard variant of $\text{NimG}$, we find an algorithm to compute an effective winning strategy in time $\mathcal{O}(\sqrt{|V(G)|}.|E(G)|)$ when $G$ is a bipartite graph.
[ { "created": "Thu, 2 Jan 2014 09:43:40 GMT", "version": "v1" }, { "created": "Sun, 3 May 2015 16:12:37 GMT", "version": "v2" } ]
2015-05-05
[ [ "Renault", "Gabriel", "" ], [ "Schmidt", "Simon", "" ] ]
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1401.0406
Milton da Costa Lopes Fo.
Anne Bronzi, Milton Lopes Filho and Helena Nussenzveig Lopes
Wild solutions for 2D incompressible ideal flow with passive tracer
10 pages
null
10.4310/CMS.2015.v13.n5.a12
null
math.AP physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In Ann. Math., 170 (2009), 1417-1436, C. De Lellis and L. Sz\'ekelyhidi Jr. constructed wild solutions of the incompressible Euler equations using a reformulation of the Euler equations as a differential inclusion together with convex integration. In this article we adapt their construction to the system consisting of adding the transport of a passive scalar to the two-dimensional incompressible Euler equations.
[ { "created": "Thu, 2 Jan 2014 10:18:58 GMT", "version": "v1" } ]
2015-10-01
[ [ "Bronzi", "Anne", "" ], [ "Filho", "Milton Lopes", "" ], [ "Lopes", "Helena Nussenzveig", "" ] ]
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1401.0412
Fei Tan
Fei Tan, Jiajing Wu, Yongxiang Xia and Chi K. Tse
Traffic congestion in interconnected complex networks
8 pages
Phys. Rev. E 89, 062813 (2014)
10.1103/PhysRevE.89.062813
null
physics.soc-ph cs.SI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Traffic congestion in isolated complex networks has been investigated extensively over the last decade. Coupled network models have recently been developed to facilitate further understanding of real complex systems. Analysis of traffic congestion in coupled complex networks, however, is still relatively unexplored. In this paper, we try to explore the effect of interconnections on traffic congestion in interconnected BA scale-free networks. We find that assortative coupling can alleviate traffic congestion more readily than disassortative and random coupling when the node processing capacity is allocated based on node usage probability. Furthermore, the optimal coupling probability can be found for assortative coupling. However, three types of coupling preferences achieve similar traffic performance if all nodes share the same processing capacity. We analyze interconnected Internet AS-level graphs of South Korea and Japan and obtain similar results. Some practical suggestions are presented to optimize such real-world interconnected networks accordingly.
[ { "created": "Thu, 2 Jan 2014 11:06:58 GMT", "version": "v1" }, { "created": "Thu, 23 Jan 2014 02:03:14 GMT", "version": "v2" } ]
2014-07-02
[ [ "Tan", "Fei", "" ], [ "Wu", "Jiajing", "" ], [ "Xia", "Yongxiang", "" ], [ "Tse", "Chi K.", "" ] ]
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1401.0417
Christos Boutsidis
Christos Boutsidis, Malik Magdon-Ismail
Faster SVD-Truncated Least-Squares Regression
2014 IEEE International Symposium on Information Theory
null
null
null
cs.DS math.NA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We develop a fast algorithm for computing the "SVD-truncated" regularized solution to the least-squares problem: $ \min_{\x} \TNorm{\matA \x - \b}. $ Let $\matA_k$ of rank $k$ be the best rank $k$ matrix computed via the SVD of $\matA$. Then, the SVD-truncated regularized solution is: $ \x_k = \pinv{\matA}_k \b. $ If $\matA$ is $m \times n$, then, it takes $O(m n \min\{m,n\})$ time to compute $\x_k $ using the SVD of \math{\matA}. We give an approximation algorithm for \math{\x_k} which constructs a rank-\math{k} approximation $\tilde{\matA}_{k}$ and computes $ \tilde{\x}_{k} = \pinv{\tilde\matA}_{k} \b$ in roughly $O(\nnz(\matA) k \log n)$ time. Our algorithm uses a randomized variant of the subspace iteration. We show that, with high probability: $ \TNorm{\matA \tilde{\x}_{k} - \b} \approx \TNorm{\matA \x_k - \b}$ and $\TNorm{\x_k - \tilde\x_k} \approx 0. $
[ { "created": "Thu, 2 Jan 2014 11:19:11 GMT", "version": "v1" }, { "created": "Wed, 28 May 2014 19:44:50 GMT", "version": "v2" } ]
2014-05-29
[ [ "Boutsidis", "Christos", "" ], [ "Magdon-Ismail", "Malik", "" ] ]
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1401.0423
Jungwon Kim
Hyoji Kim, Peng Qin, Youjian Song, Heewon Yang, Junho Shin, Chur Kim, Kwangyun Jung, Chingyue Wang, and Jungwon Kim
Sub-20-Attosecond Timing Jitter Mode-Locked Fiber Lasers
7 pages, 8 figures, 1 table
IEEE J. Sel. Top. Quantum Electron. 20, 901108 (2014)
10.1109/JSTQE.2014.2298454
null
physics.optics physics.ins-det
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We demonstrate 14.3-attosecond timing jitter [integrated from 10 kHz to 94 MHz offset frequency] optical pulse trains from 188-MHz repetition-rate mode-locked Yb-fiber lasers. In order to minimize the timing jitter, we shorten the non-gain fiber length to shorten the pulsewidth and reduce excessive higher-order nonlinearity and nonlinear chirp in the fiber laser. The measured jitter spectrum is limited by the amplified spontaneous emission limited quantum noise in the 100 kHz - 1 MHz offset frequency range, while it was limited by the relative intensity noise-converted jitter in the lower offset frequency range. This intrinsically low timing jitter enables sub-100-attosecond synchronization between the two mode-locked Yb-fiber lasers over the full Nyquist frequency with a modest 10-kHz locking bandwidth. The demonstrated performance is the lowest timing jitter measured from any free-running mode-locked fiber lasers, comparable to the performance of the lowest-jitter Ti:sapphire solid-state lasers.
[ { "created": "Thu, 2 Jan 2014 11:56:41 GMT", "version": "v1" }, { "created": "Fri, 17 Jan 2014 11:37:16 GMT", "version": "v2" } ]
2014-03-25
[ [ "Kim", "Hyoji", "" ], [ "Qin", "Peng", "" ], [ "Song", "Youjian", "" ], [ "Yang", "Heewon", "" ], [ "Shin", "Junho", "" ], [ "Kim", "Chur", "" ], [ "Jung", "Kwangyun", "" ], [ "Wang", "Chingyue", "" ], [ "Kim", "Jungwon", "" ] ]
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1401.0430
Constantin Siriteanu
Constantin Siriteanu, Akimichi Takemura, Satoshi Kuriki, Donald St. P. Richards, Hyundong Shin
Schur Complement Based Analysis of MIMO Zero-Forcing for Rician Fading
32 pages, 4 figures, 1 table
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
For multiple-input/multiple-output (MIMO) spatial multiplexing with zero-forcing detection (ZF), signal-to-noise ratio (SNR) analysis for Rician fading involves the cumbersome noncentral-Wishart distribution (NCWD) of the transmit sample-correlation (Gramian) matrix. An \textsl{approximation} with a \textsl{virtual} CWD previously yielded for the ZF SNR an approximate (virtual) Gamma distribution. However, analytical conditions qualifying the accuracy of the SNR-distribution approximation were unknown. Therefore, we have been attempting to exactly characterize ZF SNR for Rician fading. Our previous attempts succeeded only for the sole Rician-fading stream under Rician--Rayleigh fading, by writing it as scalar Schur complement (SC) in the Gramian. Herein, we pursue a more general, matrix-SC-based analysis to characterize SNRs when several streams may undergo Rician fading. On one hand, for full-Rician fading, the SC distribution is found to be exactly a CWD if and only if a channel-mean--correlation \textsl{condition} holds. Interestingly, this CWD then coincides with the \textsl{virtual} CWD ensuing from the \textsl{approximation}. Thus, under the \textsl{condition}, the actual and virtual SNR-distributions coincide. On the other hand, for Rician--Rayleigh fading, the matrix-SC distribution is characterized in terms of determinant of matrix with elementary-function entries, which also yields a new characterization of the ZF SNR. Average error probability results validate our analysis vs.~simulation.
[ { "created": "Thu, 2 Jan 2014 12:57:23 GMT", "version": "v1" }, { "created": "Tue, 4 Mar 2014 13:28:59 GMT", "version": "v2" }, { "created": "Thu, 13 Mar 2014 23:59:25 GMT", "version": "v3" }, { "created": "Fri, 26 Sep 2014 06:47:16 GMT", "version": "v4" } ]
2014-09-29
[ [ "Siriteanu", "Constantin", "" ], [ "Takemura", "Akimichi", "" ], [ "Kuriki", "Satoshi", "" ], [ "Richards", "Donald St. P.", "" ], [ "Shin", "Hyundong", "" ] ]
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1401.0432
G Ramakrishna
N.S. Narayanaswamy and G. Ramakrishna
On Minimum Average Stretch Spanning Trees in Polygonal 2-trees
17 pages, 12 figures
null
null
null
cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A spanning tree of an unweighted graph is a minimum average stretch spanning tree if it minimizes the ratio of sum of the distances in the tree between the end vertices of the graph edges and the number of graph edges. We consider the problem of computing a minimum average stretch spanning tree in polygonal 2-trees, a super class of 2-connected outerplanar graphs. For a polygonal 2-tree on $n$ vertices, we present an algorithm to compute a minimum average stretch spanning tree in $O(n \log n)$ time. This algorithm also finds a minimum fundamental cycle basis in polygonal 2-trees.
[ { "created": "Thu, 2 Jan 2014 13:31:13 GMT", "version": "v1" }, { "created": "Mon, 14 Apr 2014 07:37:46 GMT", "version": "v2" } ]
2014-04-15
[ [ "Narayanaswamy", "N. S.", "" ], [ "Ramakrishna", "G.", "" ] ]
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1401.0437
Omer Melih Gul
Omer Melih Gul, Elif Uysal-Biyikoglu
UROP: A Simple, Near-Optimal Scheduling Policy for Energy Harvesting Sensors
32 pages, 10 figures, submitted to IEEE Transactions on Information Theory
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper considers a single-hop wireless network where a central node (or fusion center, FC) collects data from a set of m energy harvesting (EH) nodes (e.g. nodes of a wireless sensor network). In each time slot, k of m nodes can be scheduled by the FC for transmission over k orthogonal channels. FC has no knowledge about EH processes and current battery states of nodes; however, it knows outcomes of previous transmission attempts. The objective is to find a low complexity scheduling policy that maximizes total throughput of the data backlogged system using the harvested energy, for all types (uniform, non-uniform, independent, correlated (i.e. Markovian), etc.) EH processes. Energy is assumed to be stored losslessly in the nodes batteries, up to a storage capacity (the infinite capacity case is also considered.) The problem is treated in finite and infinite problem horizons. A low-complexity policy, UROP (Uniformizing Random Ordered Policy) is proposed, whose near optimality is shown. Numerical examples indicate that under a reasonable-sized battery capacity, UROP uses the arriving energy with almost perfect efficiency. As the problem is a restless multi-armed bandit (RMAB) problem with an average reward criterion, UROP may have a wider application area than communication networks.
[ { "created": "Thu, 2 Jan 2014 13:49:28 GMT", "version": "v1" } ]
2014-01-03
[ [ "Gul", "Omer Melih", "" ], [ "Uysal-Biyikoglu", "Elif", "" ] ]
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1401.0443
Pradeesha Ashok
Pradeesha Ashok and Ninad Rajgopal and Sathish Govindarajan
Selection Lemmas for various geometric objects
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null
null
null
cs.CG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Selection lemmas are classical results in discrete geometry that have been well studied and have applications in many geometric problems like weak epsilon nets and slimming Delaunay triangulations. Selection lemma type results typically show that there exists a point that is contained in many objects that are induced (spanned) by an underlying point set. In the first selection lemma, we consider the set of all the objects induced (spanned) by a point set $P$. This question has been widely explored for simplices in $\mathbb{R}^d$, with tight bounds in $\mathbb{R}^2$. In our paper, we prove first selection lemma for other classes of geometric objects. We also consider the strong variant of this problem where we add the constraint that the piercing point comes from $P$. We prove an exact result on the strong and the weak variant of the first selection lemma for axis-parallel rectangles, special subclasses of axis-parallel rectangles like quadrants and slabs, disks (for centrally symmetric point sets). We also show non-trivial bounds on the first selection lemma for axis-parallel boxes and hyperspheres in $\mathbb{R}^d$. In the second selection lemma, we consider an arbitrary $m$ sized subset of the set of all objects induced by $P$. We study this problem for axis-parallel rectangles and show that there exists an point in the plane that is contained in $\frac{m^3}{24n^4}$ rectangles. This is an improvement over the previous bound by Smorodinsky and Sharir when $m$ is almost quadratic.
[ { "created": "Thu, 2 Jan 2014 14:06:04 GMT", "version": "v1" } ]
2014-01-03
[ [ "Ashok", "Pradeesha", "" ], [ "Rajgopal", "Ninad", "" ], [ "Govindarajan", "Sathish", "" ] ]
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1401.0444
Vincent Wens
Vincent Wens
Investigating complex networks with inverse models: analytical aspects of spatial leakage and connectivity estimation
19 pages, 4 figures, including 5 appendices; v2: minor edits, 1 appendix added; v3: expanded version, v4: minor edits
Physical Review E 91, 012823 (2015)
10.1103/PhysRevE.91.012823
null
physics.data-an q-bio.NC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Network theory and inverse modeling are two standard tools of applied physics, whose combination is needed when studying the dynamical organization of spatially distributed systems from indirect measurements. However, the associated connectivity estimation may be affected by spatial leakage, an artifact of inverse modeling that limits the interpretability of network analysis. This paper investigates general analytical aspects pertaining to this issue. First, the existence of spatial leakage is derived from the topological structure of inverse operators. Then, the geometry of spatial leakage is modeled and used to define a geometric correction scheme, which limits spatial leakage effects in connectivity estimation. Finally, this new approach for network analysis is compared analytically to existing methods based on linear regressions, which are shown to yield biased coupling estimates.
[ { "created": "Thu, 2 Jan 2014 14:09:31 GMT", "version": "v1" }, { "created": "Mon, 6 Jan 2014 08:16:56 GMT", "version": "v2" }, { "created": "Wed, 10 Dec 2014 17:36:40 GMT", "version": "v3" }, { "created": "Thu, 29 Jan 2015 13:37:24 GMT", "version": "v4" } ]
2015-01-30
[ [ "Wens", "Vincent", "" ] ]
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1401.0445
Siva ANANTHARAMAN
Siva Anantharaman (LIFO, Universite d'Orleans (France)), Christopher Bouchard (University at Albany - SUNY), Paliath Narendran (University at Albany - SUNY), Micha\"el Rusinowitch (Loria-INRIA Grand Est, Nancy (France))
Unification modulo a 2-sorted Equational theory for Cipher-Decipher Block Chaining
26 pages
Logical Methods in Computer Science, Volume 10, Issue 1 (February 9, 2014) lmcs:808
10.2168/LMCS-10(1:5)2014
null
cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We investigate unification problems related to the Cipher Block Chaining (CBC) mode of encryption. We first model chaining in terms of a simple, convergent, rewrite system over a signature with two disjoint sorts: list and element. By interpreting a particular symbol of this signature suitably, the rewrite system can model several practical situations of interest. An inference procedure is presented for deciding the unification problem modulo this rewrite system. The procedure is modular in the following sense: any given problem is handled by a system of `list-inferences', and the set of equations thus derived between the element-terms of the problem is then handed over to any (`black-box') procedure which is complete for solving these element-equations. An example of application of this unification procedure is given, as attack detection on a Needham-Schroeder like protocol, employing the CBC encryption mode based on the associative-commutative (AC) operator XOR. The 2-sorted convergent rewrite system is then extended into one that fully captures a block chaining encryption-decryption mode at an abstract level, using no AC-symbols; and unification modulo this extended system is also shown to be decidable.
[ { "created": "Thu, 2 Jan 2014 14:17:55 GMT", "version": "v1" }, { "created": "Tue, 4 Feb 2014 21:35:17 GMT", "version": "v2" }, { "created": "Thu, 6 Feb 2014 13:14:05 GMT", "version": "v3" } ]
2015-07-01
[ [ "Anantharaman", "Siva", "", "LIFO, Universite d'Orleans" ], [ "Bouchard", "Christopher", "", "University at Albany - SUNY" ], [ "Narendran", "Paliath", "", "University at\n Albany - SUNY" ], [ "Rusinowitch", "Michaël", "", "Loria-INRIA Grand Est, Nancy" ] ]
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1401.0447
Renaud Lambiotte
Renaud Lambiotte, Vsevolod Salnikov and Martin Rosvall
Effect of Memory on the Dynamics of Random Walks on Networks
6 pages; 6 figures
null
null
null
physics.soc-ph cs.SI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Pathways of diffusion observed in real-world systems often require stochastic processes going beyond first-order Markov models, as implicitly assumed in network theory. In this work, we focus on second-order Markov models, and derive an analytical expression for the effect of memory on the spectral gap and thus, equivalently, on the characteristic time needed for the stochastic process to asymptotically reach equilibrium. Perturbation analysis shows that standard first-order Markov models can either overestimate or underestimate the diffusion rate of flows across the modular structure of a system captured by a second-order Markov network. We test the theoretical predictions on a toy example and on numerical data, and discuss their implications for network theory, in particular in the case of temporal or multiplex networks.
[ { "created": "Thu, 2 Jan 2014 14:27:29 GMT", "version": "v1" } ]
2014-01-03
[ [ "Lambiotte", "Renaud", "" ], [ "Salnikov", "Vsevolod", "" ], [ "Rosvall", "Martin", "" ] ]
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null
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1401.0450
Michele Merano
G.Jayaswal, G.Mistura, and M.Merano
Observation of the Imbert-Fedorov effect via weak value amplification
null
null
10.1364/OL.39.002266
null
physics.optics quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Weak measurements have recently allowed for the observation of the spin-Hall effect of light in reflection or transmission, which is a spin-dependent light beam shift orthogonal to the plane of incidence. We report here the observation of the Imbert-Fedorov shift via a weak value amplification scheme. The Imbert-Fedorov effect does not depend on the spin of the incident photon only, but it has richer polarization dependence. We prove that weak measurements allow for a complete experimental characterization of the polarization properties of this tiny optical effect.
[ { "created": "Thu, 2 Jan 2014 14:42:27 GMT", "version": "v1" }, { "created": "Fri, 24 Jan 2014 11:11:04 GMT", "version": "v2" }, { "created": "Wed, 19 Mar 2014 16:45:23 GMT", "version": "v3" } ]
2015-06-18
[ [ "Jayaswal", "G.", "" ], [ "Mistura", "G.", "" ], [ "Merano", "M.", "" ] ]
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1401.0458
David F. Nettleton
David F. Nettleton, Vicenc Torra, and Anton Dries
The effect of constraints on information loss and risk for clustering and modification based graph anonymization methods
21 pages, 6 figures, 7 tables
null
null
This research is partially supported by the Spanish MEC (projects ARES CONSOLIDER INGENIO 2010 CSD2007-00004--eAEGISTSI2007-65406-C03-02--and HIPERGRAPH TIN2009-14560-C03-01)
cs.CR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we present a novel approach for anonymizing Online Social Network graphs which can be used in conjunction with existing perturbation approaches such as clustering and modification. The main insight of this paper is that by imposing additional constraints on which nodes can be selected we can reduce the information loss with respect to key structural metrics, while maintaining an acceptable risk. We present and evaluate two constraints, 'local1' and 'local2' which select the most similar subgraphs within the same community while excluding some key structural nodes. To this end, we introduce a novel distance metric based on local subgraph characteristics and which is calibrated using an isomorphism matcher. Empirical testing is conducted with three real OSN datasets, six information loss measures, five adversary queries as risk measures, and different levels of k-anonymity. The results show that overall, the methods with constraints give the best results for information loss and risk of disclosure.
[ { "created": "Thu, 2 Jan 2014 15:46:06 GMT", "version": "v1" }, { "created": "Fri, 14 Feb 2014 17:04:36 GMT", "version": "v2" }, { "created": "Thu, 27 Feb 2014 17:02:33 GMT", "version": "v3" }, { "created": "Tue, 1 Jul 2014 15:10:06 GMT", "version": "v4" } ]
2021-01-07
[ [ "Nettleton", "David F.", "" ], [ "Torra", "Vicenc", "" ], [ "Dries", "Anton", "" ] ]
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1401.0461
Boris Gralak
Boris Gralak, Michel Lequime, Myriam Zerrad, Claude Amra
Phase retrieval of reflection and transmission coefficients from Kramers-Kronig relations
submitted for publication
null
10.1364/JOSAA.32.000456
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Analytic and passivity properties of reflection and transmission coefficients of thin-film multilayered stacks are investigated. Using a rigorous formalism based on the inverse Helmholtz operator, properties associated to causality principle and passivity are established when both temporal frequency and spatial wavevector are continued in the complex plane. This result extends the range of situations where the Kramers-Kronig relations can be used to deduce the phase from the intensity. In particular, it is rigorously shown that Kramers-Kronig relations for reflection and transmission coefficients remain valid at a fixed angle of incidence. Possibilities to exploit the new relationships are discussed.
[ { "created": "Thu, 2 Jan 2014 16:04:00 GMT", "version": "v1" } ]
2015-06-18
[ [ "Gralak", "Boris", "" ], [ "Lequime", "Michel", "" ], [ "Zerrad", "Myriam", "" ], [ "Amra", "Claude", "" ] ]
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1401.0463
Rodrigo de Lamare
Rodrigo C. de Lamare and Raimundo Sampaio-Neto
Sparsity-Aware Adaptive Algorithms Based on Alternating Optimization with Shrinkage
10 pages, 3 figures. IEEE Signal Processing Letters, 2014
null
null
null
cs.SY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This letter proposes a novel sparsity-aware adaptive filtering scheme and algorithms based on an alternating optimization strategy with shrinkage. The proposed scheme employs a two-stage structure that consists of an alternating optimization of a diagonally-structured matrix that speeds up the convergence and an adaptive filter with a shrinkage function that forces the coefficients with small magnitudes to zero. We devise alternating optimization least-mean square (LMS) algorithms for the proposed scheme and analyze its mean-square error. Simulations for a system identification application show that the proposed scheme and algorithms outperform in convergence and tracking existing sparsity-aware algorithms.
[ { "created": "Thu, 2 Jan 2014 16:15:09 GMT", "version": "v1" } ]
2014-01-03
[ [ "de Lamare", "Rodrigo C.", "" ], [ "Sampaio-Neto", "Raimundo", "" ] ]
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1401.0468
Mabel Iglesias-Ham
Mabel Iglesias-Ham, Michael Kerber and Caroline Uhler
Sphere Packing with Limited Overlap
12 pages, 3 figures, submitted to SOCG 2014
null
null
null
cs.CG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The classical sphere packing problem asks for the best (infinite) arrangement of non-overlapping unit balls which cover as much space as possible. We define a generalized version of the problem, where we allow each ball a limited amount of overlap with other balls. We study two natural choices of overlap measures and obtain the optimal lattice packings in a parameterized family of lattices which contains the FCC, BCC, and integer lattice.
[ { "created": "Thu, 2 Jan 2014 16:36:24 GMT", "version": "v1" } ]
2014-01-03
[ [ "Iglesias-Ham", "Mabel", "" ], [ "Kerber", "Michael", "" ], [ "Uhler", "Caroline", "" ] ]
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1401.0480
Denzil Correa
Denzil Correa and Ashish Sureka
Chaff from the Wheat : Characterization and Modeling of Deleted Questions on Stack Overflow
11 pages, Pre-print
null
null
null
cs.IR cs.SI
http://creativecommons.org/licenses/by-nc-sa/3.0/
Stack Overflow is the most popular CQA for programmers on the web with 2.05M users, 5.1M questions and 9.4M answers. Stack Overflow has explicit, detailed guidelines on how to post questions and an ebullient moderation community. Despite these precise communications and safeguards, questions posted on Stack Overflow can be extremely off topic or very poor in quality. Such questions can be deleted from Stack Overflow at the discretion of experienced community members and moderators. We present the first study of deleted questions on Stack Overflow. We divide our study into two parts (i) Characterization of deleted questions over approx. 5 years (2008-2013) of data, (ii) Prediction of deletion at the time of question creation. Our characterization study reveals multiple insights on question deletion phenomena. We observe a significant increase in the number of deleted questions over time. We find that it takes substantial time to vote a question to be deleted but once voted, the community takes swift action. We also see that question authors delete their questions to salvage reputation points. We notice some instances of accidental deletion of good quality questions but such questions are voted back to be undeleted quickly. We discover a pyramidal structure of question quality on Stack Overflow and find that deleted questions lie at the bottom (lowest quality) of the pyramid. We also build a predictive model to detect the deletion of question at the creation time. We experiment with 47 features based on User Profile, Community Generated, Question Content and Syntactic style and report an accuracy of 66%. Our feature analysis reveals that all four categories of features are important for the prediction task. Our findings reveal important suggestions for content quality maintenance on community based question answering websites.
[ { "created": "Thu, 2 Jan 2014 17:36:32 GMT", "version": "v1" } ]
2014-01-03
[ [ "Correa", "Denzil", "" ], [ "Sureka", "Ashish", "" ] ]
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1401.0486
Najiba Tagougui
Najiba Tagougui, Houcine Boubaker, Monji Kherallah, Adel M. ALIMI
A Hybrid NN/HMM Modeling Technique for Online Arabic Handwriting Recognition
null
International Journal of Computational Linguistics Research Volume 4 Number 3 September 2013 pp. 107-118
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null
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this work we propose a hybrid NN/HMM model for online Arabic handwriting recognition. The proposed system is based on Hidden Markov Models (HMMs) and Multi Layer Perceptron Neural Networks (MLPNNs). The input signal is segmented to continuous strokes called segments based on the Beta-Elliptical strategy by inspecting the extremum points of the curvilinear velocity profile. A neural network trained with segment level contextual information is used to extract class character probabilities. The output of this network is decoded by HMMs to provide character level recognition. In evaluations on the ADAB database, we achieved 96.4% character recognition accuracy that is statistically significantly important in comparison with character recognition accuracies obtained from state-of-the-art online Arabic systems.8
[ { "created": "Thu, 2 Jan 2014 17:58:27 GMT", "version": "v1" } ]
2014-01-03
[ [ "Tagougui", "Najiba", "" ], [ "Boubaker", "Houcine", "" ], [ "Kherallah", "Monji", "" ], [ "ALIMI", "Adel M.", "" ] ]
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1401.0494
Minyar Sassi
Ines Benali-Sougui, Minyar Sassi-Hidri, Amel Grissa-Touzi
Flexible SQLf query based on fuzzy linguistic summaries
null
International Conference on Control, Engineering & Information Technology (CEIT), Proceedings Engineering & Technology, Vol. 1, pp. 175-180, 2013
null
null
cs.DB
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Data is often partially known, vague or ambiguous in many real world applications. To deal with such imprecise information, fuzziness is introduced in the classical model. SQLf is one of the practical language to deal with flexible fuzzy querying in Fuzzy DataBases (FDB). However, with a huge amount of fuzzy data, the necessity to work with synthetic views became a challenge for many DB community researchers. The present work deals with Flexible SQLf query based on fuzzy linguistic summaries. We use the fuzzy summaries produced by our Fuzzy-SaintEtiq approach. It provides a description of objects depending on the fuzzy linguistic labels specified as selection criteria.
[ { "created": "Thu, 2 Jan 2014 18:14:33 GMT", "version": "v1" } ]
2014-01-03
[ [ "Benali-Sougui", "Ines", "" ], [ "Sassi-Hidri", "Minyar", "" ], [ "Grissa-Touzi", "Amel", "" ] ]
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1401.0496
Iasson Karafyllis
Iasson Karafyllis and Markos Papageorgiou
Global Stability Results for Traffic Networks
22 pages, 1 figure, to be submitted for possible publication
null
null
null
math.OC cs.SY math.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper provides sufficient conditions for global asymptotic stability and global exponential stability, which can be applied to nonlinear, large-scale, uncertain discrete-time systems. The conditions are derived by means of vector Lyapunov functions. The obtained results are applied to traffic networks for the derivation of sufficient conditions of global exponential stability of the uncongested equilibrium point of the network. Specific results and algorithms are provided for freeway models. Various examples illustrate the applicability of the obtained results.
[ { "created": "Thu, 2 Jan 2014 18:16:51 GMT", "version": "v1" }, { "created": "Mon, 24 Mar 2014 08:58:03 GMT", "version": "v2" } ]
2014-03-25
[ [ "Karafyllis", "Iasson", "" ], [ "Papageorgiou", "Markos", "" ] ]
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1401.0508
Giulio Magli
Giulio Magli
The Giza "written" landscape and the double project of King Khufu
Archaeoastronomy/History of Astronomy
Time and Mind 9, 57-74, 2016
null
null
physics.hist-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In recent years, different scientific disciplines, from Physics to Egyptology, from Geology to Archaeoastronomy, evidenced a series of clues pointing to the possibility that the original project of the pyramid complex of Khufu at Giza included also the project of the second pyramid complex at the same site, that of Khafra. The aim of the present paper is to discuss this issue in a systematic fashion and to explore its consequences on the way the ancient Egyptians conceived and built monuments and entire landscapes during the Old Kingdom.
[ { "created": "Thu, 2 Jan 2014 19:08:42 GMT", "version": "v1" } ]
2016-09-27
[ [ "Magli", "Giulio", "" ] ]
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1401.0513
Bernhard Mehlig
K. Gustavsson, S. Vajedi, and B. Mehlig
Clustering of particles falling in a turbulent flow
5 pages, 3 figures, supplemental material
Phys. Rev. Lett. 112, 214501 (2014)
10.1103/PhysRevLett.112.214501
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Spatial clustering of identical particles falling through a turbulent flow enhances the collision rate between the falling particles, an important problem in aerosol science. We analyse this problem using perturbation theory in a dimensionless parameter, the so-called Kubo number. This allows us to derive an analytical theory quantifying the spatial clustering. We find that clustering of small particles in incompressible random velocity fields may be reduced or enhanced by the effect of gravity (depending on the Stokes number of the particles) and may be strongly anisotropic.
[ { "created": "Thu, 2 Jan 2014 19:28:10 GMT", "version": "v1" }, { "created": "Fri, 28 Mar 2014 19:10:06 GMT", "version": "v2" } ]
2015-06-18
[ [ "Gustavsson", "K.", "" ], [ "Vajedi", "S.", "" ], [ "Mehlig", "B.", "" ] ]
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1401.0514
Chris J. Maddison
Chris J. Maddison and Daniel Tarlow
Structured Generative Models of Natural Source Code
null
null
null
null
cs.PL cs.LG stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the problem of building generative models of natural source code (NSC); that is, source code written and understood by humans. Our primary contribution is to describe a family of generative models for NSC that have three key properties: First, they incorporate both sequential and hierarchical structure. Second, we learn a distributed representation of source code elements. Finally, they integrate closely with a compiler, which allows leveraging compiler logic and abstractions when building structure into the model. We also develop an extension that includes more complex structure, refining how the model generates identifier tokens based on what variables are currently in scope. Our models can be learned efficiently, and we show empirically that including appropriate structure greatly improves the models, measured by the probability of generating test programs.
[ { "created": "Thu, 2 Jan 2014 19:35:31 GMT", "version": "v1" }, { "created": "Fri, 20 Jun 2014 08:12:20 GMT", "version": "v2" } ]
2014-06-23
[ [ "Maddison", "Chris J.", "" ], [ "Tarlow", "Daniel", "" ] ]
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1401.0523
Khalid Jebari hassani
Khalid Jebari, Mohammed Madiafi, Abdelaziz El Moujahid
Solving Poisson Equation by Genetic Algorithms
null
International Journal of Computer Applications Volume 83, No 5, December 2013
null
null
cs.NE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper deals with a method for solving Poisson Equation (PE) based on genetic algorithms and grammatical evolution. The method forms generations of solutions expressed in an analytical form. Several examples of PE are tested and in most cases the exact solution is recovered. But, when the solution cannot be expressed in an analytical form, our method produces a satisfactory solution with a good level of accuracy
[ { "created": "Thu, 2 Jan 2014 20:15:00 GMT", "version": "v1" } ]
2014-01-03
[ [ "Jebari", "Khalid", "" ], [ "Madiafi", "Mohammed", "" ], [ "Moujahid", "Abdelaziz El", "" ] ]
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1401.0525
Konstantinos Mavrokoridis
K. Mavrokoridis, F. Ball, J. Carroll, M. Lazos, K. J. McCormick, N. A. Smith, C. Touramanis, J. Walker
Optical Readout of a Two Phase Liquid Argon TPC using CCD Camera and THGEMs
The acronym TGEM was changed to THGEM. Typos in text and figures were corrected. References were added
null
10.1088/1748-0221/9/02/P02006
null
physics.ins-det
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper presents a preliminary study into the use of CCDs to image secondary scintillation light generated by THick Gas Electron Multipliers (THGEMs) in a two phase LAr TPC. A Sony ICX285AL CCD chip was mounted above a double THGEM in the gas phase of a 40 litre two-phase LAr TPC with the majority of the camera electronics positioned externally via a feedthrough. An Am-241 source was mounted on a rotatable motion feedthrough allowing the positioning of the alpha source either inside or outside of the field cage. Developed for and incorporated into the TPC design was a novel high voltage feedthrough featuring LAr insulation. Furthermore, a range of webcams were tested for operation in cryogenics as an internal detector monitoring tool. Of the range of webcams tested the Microsoft HD-3000 (model no:1456) webcam was found to be superior in terms of noise and lowest operating temperature. In ambient temperature and atmospheric pressure 1 ppm pure argon gas, the THGEM gain was approximately 1000 and using a 1 msec exposure the CCD captured single alpha tracks. Successful operation of the CCD camera in two-phase cryogenic mode was also achieved. Using a 10 sec exposure a photograph of secondary scintillation light induced by the Am-241 source in LAr has been captured for the first time.
[ { "created": "Thu, 2 Jan 2014 20:24:50 GMT", "version": "v1" }, { "created": "Thu, 20 Feb 2014 09:44:27 GMT", "version": "v2" } ]
2015-06-18
[ [ "Mavrokoridis", "K.", "" ], [ "Ball", "F.", "" ], [ "Carroll", "J.", "" ], [ "Lazos", "M.", "" ], [ "McCormick", "K. J.", "" ], [ "Smith", "N. A.", "" ], [ "Touramanis", "C.", "" ], [ "Walker", "J.", "" ] ]
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1401.0543
Amy Fu
Amy Fu and Parastoo Sadeghi and Muriel Medard
Beyond the Min-Cut Bound: Deterministic Network Coding for Asynchronous Multirate Broadcast
null
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In a single hop broadcast packet erasure network, we demonstrate that it is possible to provide multirate packet delivery outside of what is given by the network min-cut. This is achieved by using a deterministic non-block-based network coding scheme, which allows us to sidestep some of the limitations put in place by the block coding model used to determine the network capacity. Under the network coding scheme we outline, the sender is able to transmit network coded packets above the channel rate of some receivers, while ensuring that they still experience nonzero delivery rates. Interestingly, in this generalised form of asynchronous network coded broadcast, receivers are not required to obtain knowledge of all packets transmitted so far. Instead, causal feedback from the receivers about packet erasures is used by the sender to determine a network coded transmission that will allow at least one, but often multiple receivers, to deliver their next needed packet. Although the analysis of deterministic coding schemes is generally a difficult problem, by making some approximations we are able to obtain tractable estimates of the receivers' delivery rates, which are shown to match reasonably well with simulation. Using these estimates, we design a fairness algorithm that allocates the sender's resources so all receivers will experience fair delivery rate performance.
[ { "created": "Thu, 2 Jan 2014 21:02:34 GMT", "version": "v1" } ]
2014-01-06
[ [ "Fu", "Amy", "" ], [ "Sadeghi", "Parastoo", "" ], [ "Medard", "Muriel", "" ] ]
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1401.0546
Muhammad Omer Bin Saeed
Muhammad Saqib Sohail, Muhammad Omer Bin Saeed, Syed Zeeshan Rizvi, Mobien Shoaib and Asrar Ul Haq Sheikh
Low-Complexity Particle Swarm Optimization for Time-Critical Applications
24 pages, 1 figure
null
null
null
cs.NE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Particle swam optimization (PSO) is a popular stochastic optimization method that has found wide applications in diverse fields. However, PSO suffers from high computational complexity and slow convergence speed. High computational complexity hinders its use in applications that have limited power resources while slow convergence speed makes it unsuitable for time critical applications. In this paper, we propose two techniques to overcome these limitations. The first technique reduces the computational complexity of PSO while the second technique speeds up its convergence. These techniques can be applied, either separately or in conjunction, to any existing PSO variant. The proposed techniques are robust to the number of dimensions of the optimization problem. Simulation results are presented for the proposed techniques applied to the standard PSO as well as to several PSO variants. The results show that the use of both these techniques in conjunction results in a reduction in the number of computations required as well as faster convergence speed while maintaining an acceptable error performance for time-critical applications.
[ { "created": "Thu, 2 Jan 2014 21:09:55 GMT", "version": "v1" } ]
2014-01-06
[ [ "Sohail", "Muhammad Saqib", "" ], [ "Saeed", "Muhammad Omer Bin", "" ], [ "Rizvi", "Syed Zeeshan", "" ], [ "Shoaib", "Mobien", "" ], [ "Sheikh", "Asrar Ul Haq", "" ] ]
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1401.0550
Valeriy Etkin
V. A. Etkin
Methodological principles of modern thermodynamics
17 pages, 2 figures
null
null
null
physics.gen-ph
http://creativecommons.org/licenses/by/3.0/
The article describes basic principles of the theory which unites thermodynamics of reversible and irreversible processes also extends them methods on processes of transfer and transformation of any forms of energy
[ { "created": "Thu, 2 Jan 2014 21:45:34 GMT", "version": "v1" } ]
2014-02-10
[ [ "Etkin", "V. A.", "" ] ]
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1401.0555
Xiang-Yao Wu
Xiang-Yao Wu, Hong Li, Xiao-Jing Liu, Si-Qi Zhang, Ji Ma, Guang-Huai Wang, Hai-Xin Gao, Heng-Mei Li, Hong-Chun Yuan
Relativistic spinor equation of photon
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physics.gen-ph quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we have proposed the spiron equation of free and non-free photon, and give the spin operator and spin wave function of photon. We calculate the helicity of photon and prove there are left-handed and right-handed photon. By the spiron equation of non-free photon, we can study the quantum property of photon in medium, which can be used in quantum optics, photonic crystals and so on.
[ { "created": "Thu, 2 Jan 2014 22:11:08 GMT", "version": "v1" } ]
2014-01-06
[ [ "Wu", "Xiang-Yao", "" ], [ "Li", "Hong", "" ], [ "Liu", "Xiao-Jing", "" ], [ "Zhang", "Si-Qi", "" ], [ "Ma", "Ji", "" ], [ "Wang", "Guang-Huai", "" ], [ "Gao", "Hai-Xin", "" ], [ "Li", "Heng-Mei", "" ], [ "Yuan", "Hong-Chun", "" ] ]
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1401.0561
Janne Lindqvist
Michael Sherman, Gradeigh Clark, Yulong Yang, Shridatt Sugrim, Arttu Modig, Janne Lindqvist, Antti Oulasvirta, Teemu Roos
User-Generated Free-Form Gestures for Authentication: Security and Memorability
null
null
null
null
cs.CR cs.HC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper studies the security and memorability of free-form multitouch gestures for mobile authentication. Towards this end, we collected a dataset with a generate-test-retest paradigm where participants (N=63) generated free-form gestures, repeated them, and were later retested for memory. Half of the participants decided to generate one-finger gestures, and the other half generated multi-finger gestures. Although there has been recent work on template-based gestures, there are yet no metrics to analyze security of either template or free-form gestures. For example, entropy-based metrics used for text-based passwords are not suitable for capturing the security and memorability of free-form gestures. Hence, we modify a recently proposed metric for analyzing information capacity of continuous full-body movements for this purpose. Our metric computed estimated mutual information in repeated sets of gestures. Surprisingly, one-finger gestures had higher average mutual information. Gestures with many hard angles and turns had the highest mutual information. The best-remembered gestures included signatures and simple angular shapes. We also implemented a multitouch recognizer to evaluate the practicality of free-form gestures in a real authentication system and how they perform against shoulder surfing attacks. We conclude the paper with strategies for generating secure and memorable free-form gestures, which present a robust method for mobile authentication.
[ { "created": "Thu, 2 Jan 2014 23:15:27 GMT", "version": "v1" } ]
2014-01-06
[ [ "Sherman", "Michael", "" ], [ "Clark", "Gradeigh", "" ], [ "Yang", "Yulong", "" ], [ "Sugrim", "Shridatt", "" ], [ "Modig", "Arttu", "" ], [ "Lindqvist", "Janne", "" ], [ "Oulasvirta", "Antti", "" ], [ "Roos", "Teemu", "" ] ]
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1401.0564
EPTCS
Nazareno Aguirre (Universidad Nacional de R\'io Cuarto), Leila Ribeiro (Universidade Federal do Rio Grande do Sul)
Proceedings First Latin American Workshop on Formal Methods
null
EPTCS 139, 2014
10.4204/EPTCS.139
null
cs.SE cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Formal approaches to software development are techniques that aim at developing quality software by employing notations, analysis processes, etc., based on mathematical grounds. Although traditionally they aim at increasing software correctness, formal techniques have been applied to various other aspects of software quality. Moreover, while originally formal methods employed complex "heavyweight" mechanisms for analysis (often manual or semi automated), there has been progress towards embracing "lightweight", many times fully automated, analysis techniques, that broaden the adoption of formal methods in various software engineering contexts. The Latin American Workshop on Formal Methods brings together researchers working in formal methods, and related areas such as automated analysis. In particular, the workshop provides a venue for Latin American researchers working in these areas, to promote their interaction and collaboration. The workshop was held in August as a satellite event of CONCUR 2013. It took place in Buenos Aires, Argentina's capital and largest city, and one of the most interesting cultural places in South America.
[ { "created": "Thu, 2 Jan 2014 23:29:24 GMT", "version": "v1" } ]
2014-01-06
[ [ "Aguirre", "Nazareno", "", "Universidad Nacional de Río Cuarto" ], [ "Ribeiro", "Leila", "", "Universidade Federal do Rio Grande do Sul" ] ]
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1401.0565
Rona Oran
R. Oran, E. Landi, B. van der Holst, I. V. Sokolov, T. I. Gombosi
Alfv\'en Wave Turbulence as a Coronal Heating Mechanism: Simultaneously Predicting the Heating Rate and the Wave-Induced Emission Line Broadening
Submitted to the Astrophysical Journal
null
null
null
astro-ph.SR physics.space-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In the present work, we test the predictions of the AWSoM model, a global extended-MHD model capable of calculating the propagation and turbulent dissipation of Alfv\'en waves in any magnetic topology, against high resolution spectra of the quiescent off-disk solar corona. Wave dissipation is the only heating mechanism assumed in this model. Combining 3D model results with the CHIANTI atomic database, we were able to create synthetic line-of-sight spectra which include the effects of emission line broadening due to both thermal and wave-related non-thermal motions. To the best of our knowledge this is the first time a global model is used to obtain synthetic non-thermal line broadening. We obtained a steady-state solution driven by a synoptic magnetogram and compared the synthetic spectra with SUMER observations of a quiescent area above the solar west limb extending between 1.04 and 1.34 solar radii at the equator. Both the predicted line widths and the total line fluxes were consistent with the observations for 5 different ions. Using the 3D solution, we were able to locate the region that contributes the most to the emission used for measuring electron properties; we found that region to be a pseudo-streamer, whose modeled electron temperature and density are consistent with the measured ones. We conclude that the turbulent dissipation assumed in the AWSoM model can simultaneously account for the observed heating rate and the non-dissipated wave energy observed in this region.
[ { "created": "Thu, 2 Jan 2014 23:39:39 GMT", "version": "v1" } ]
2014-01-06
[ [ "Oran", "R.", "" ], [ "Landi", "E.", "" ], [ "van der Holst", "B.", "" ], [ "Sokolov", "I. V.", "" ], [ "Gombosi", "T. I.", "" ] ]
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1401.0569
Son Doan
Son Doan, Mike Conway, Tu Minh Phuong, Lucila Ohno-Machado
Natural Language Processing in Biomedicine: A Unified System Architecture Overview
25 pages, 5 figures, book chapter in Clinical Bioinformatics, 2014, edited by Ronand Trent
null
10.1007/978-1-4939-0847-9_16
null
cs.CL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In modern electronic medical records (EMR) much of the clinically important data - signs and symptoms, symptom severity, disease status, etc. - are not provided in structured data fields, but rather are encoded in clinician generated narrative text. Natural language processing (NLP) provides a means of "unlocking" this important data source for applications in clinical decision support, quality assurance, and public health. This chapter provides an overview of representative NLP systems in biomedicine based on a unified architectural view. A general architecture in an NLP system consists of two main components: background knowledge that includes biomedical knowledge resources and a framework that integrates NLP tools to process text. Systems differ in both components, which we will review briefly. Additionally, challenges facing current research efforts in biomedical NLP include the paucity of large, publicly available annotated corpora, although initiatives that facilitate data sharing, system evaluation, and collaborative work between researchers in clinical NLP are starting to emerge.
[ { "created": "Fri, 3 Jan 2014 00:57:13 GMT", "version": "v1" }, { "created": "Wed, 8 Jan 2014 19:00:04 GMT", "version": "v2" } ]
2014-08-10
[ [ "Doan", "Son", "" ], [ "Conway", "Mike", "" ], [ "Phuong", "Tu Minh", "" ], [ "Ohno-Machado", "Lucila", "" ] ]
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1401.0572
Pengfei Lan
Pengfei Lan, Yuming Zhou, Adrian N. Pfeiffer, Qingbin Zhang, Peixiang Lu, Katsumi Midorikawa Lu
Revealing the role of electron correlation in sequential double ionization
14 pages, 5 figures, submitted
Phys. Rev. A 89, 033424(2014)
10.1103/PhysRevA.89.033424
null
physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The experimental observations of sequential double ionization (SDI) of Ar [A. N. Pfeiffer {\it et al.}, Nature Phys. {\bf 7}, 428 (2011)], such as the four-peak momentum distribution and the ionization time of the first and second electrons, are investigated and reproduced with a quantum model by including and excluding the $e$-$e$ correlation effect. Based on the comparison of experiment and simulation, the role of $e$-$e$ correlation in SDI is discussed. It is shown that the inclusion of $e$-$e$ correlation is necessary to reproduce the momentum distribution of electrons.
[ { "created": "Fri, 3 Jan 2014 01:41:54 GMT", "version": "v1" } ]
2014-04-01
[ [ "Lan", "Pengfei", "" ], [ "Zhou", "Yuming", "" ], [ "Pfeiffer", "Adrian N.", "" ], [ "Zhang", "Qingbin", "" ], [ "Lu", "Peixiang", "" ], [ "Lu", "Katsumi Midorikawa", "" ] ]
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1401.0578
Jwo-Yuh Wu
Ling-Hua Chang and Jwo-Yuh Wu
An Improved RIP-Based Performance Guarantee for Sparse Signal Recovery via Orthogonal Matching Pursuit
38 pages,4 figures
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A sufficient condition reported very recently for perfect recovery of a K-sparse vector via orthogonal matching pursuit (OMP) in K iterations is that the restricted isometry constant of the sensing matrix satisfies delta_K+1<1/(sqrt(delta_K+1)+1). By exploiting an approximate orthogonality condition characterized via the achievable angles between two orthogonal sparse vectors upon compression, this paper shows that the upper bound on delta can be further relaxed to delta_K+1<(sqrt(1+4*delta_K+1)-1)/(2K).This result thus narrows the gap between the so far best known bound and the ultimate performance guarantee delta_K+1<1/(sqrt(delta_K+1)) that is conjectured by Dai and Milenkovic in 2009. The proposed approximate orthogonality condition is also exploited to derive less restricted sufficient conditions for signal reconstruction in several compressive sensing problems, including signal recovery via OMP in a noisy environment, compressive domain interference cancellation, and support identification via the subspace pursuit algorithm.
[ { "created": "Fri, 3 Jan 2014 02:48:12 GMT", "version": "v1" } ]
2014-01-06
[ [ "Chang", "Ling-Hua", "" ], [ "Wu", "Jwo-Yuh", "" ] ]
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1401.0579
Tengyu Ma
Sanjeev Arora, Aditya Bhaskara, Rong Ge, Tengyu Ma
More Algorithms for Provable Dictionary Learning
23 pages
null
null
null
cs.DS cs.LG stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In dictionary learning, also known as sparse coding, the algorithm is given samples of the form $y = Ax$ where $x\in \mathbb{R}^m$ is an unknown random sparse vector and $A$ is an unknown dictionary matrix in $\mathbb{R}^{n\times m}$ (usually $m > n$, which is the overcomplete case). The goal is to learn $A$ and $x$. This problem has been studied in neuroscience, machine learning, visions, and image processing. In practice it is solved by heuristic algorithms and provable algorithms seemed hard to find. Recently, provable algorithms were found that work if the unknown feature vector $x$ is $\sqrt{n}$-sparse or even sparser. Spielman et al. \cite{DBLP:journals/jmlr/SpielmanWW12} did this for dictionaries where $m=n$; Arora et al. \cite{AGM} gave an algorithm for overcomplete ($m >n$) and incoherent matrices $A$; and Agarwal et al. \cite{DBLP:journals/corr/AgarwalAN13} handled a similar case but with weaker guarantees. This raised the problem of designing provable algorithms that allow sparsity $\gg \sqrt{n}$ in the hidden vector $x$. The current paper designs algorithms that allow sparsity up to $n/poly(\log n)$. It works for a class of matrices where features are individually recoverable, a new notion identified in this paper that may motivate further work. The algorithm runs in quasipolynomial time because they use limited enumeration.
[ { "created": "Fri, 3 Jan 2014 02:52:17 GMT", "version": "v1" } ]
2014-01-06
[ [ "Arora", "Sanjeev", "" ], [ "Bhaskara", "Aditya", "" ], [ "Ge", "Rong", "" ], [ "Ma", "Tengyu", "" ] ]
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1401.0583
Garrett Warnell
Garrett Warnell, Sourabh Bhattacharya, Rama Chellappa, Tamer Basar
Adaptive-Rate Compressive Sensing Using Side Information
null
null
null
null
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We provide two novel adaptive-rate compressive sensing (CS) strategies for sparse, time-varying signals using side information. Our first method utilizes extra cross-validation measurements, and the second one exploits extra low-resolution measurements. Unlike the majority of current CS techniques, we do not assume that we know an upper bound on the number of significant coefficients that comprise the images in the video sequence. Instead, we use the side information to predict the number of significant coefficients in the signal at the next time instant. For each image in the video sequence, our techniques specify a fixed number of spatially-multiplexed CS measurements to acquire, and adjust this quantity from image to image. Our strategies are developed in the specific context of background subtraction for surveillance video, and we experimentally validate the proposed methods on real video sequences.
[ { "created": "Fri, 3 Jan 2014 04:01:29 GMT", "version": "v1" } ]
2014-01-06
[ [ "Warnell", "Garrett", "" ], [ "Bhattacharya", "Sourabh", "" ], [ "Chellappa", "Rama", "" ], [ "Basar", "Tamer", "" ] ]
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1401.0585
Thomas Sandholm
Thomas Sandholm, Dongman Lee, Bjorn Tegelund, Seonyeong Han, Byoungheon Shin, Byoungoh Kim
CloudFridge: A Testbed for Smart Fridge Interactions
null
null
null
null
cs.HC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a testbed for exploring novel smart refrigerator interactions, and identify three key adoption-limiting interaction shortcomings of state-of-the-art smart fridges: lack of 1) user experience focus, 2) low-intrusion object recognition and 2) automatic item position detection. Our testbed system addresses these limitations by a combination of sensors, software filters, architectural components and a RESTful API to track interaction events in real-time, and retrieve current state and historical data to learn patterns and recommend user actions. We evaluate the accuracy and overhead of our system in a realistic interaction flow. The accuracy was measured to 83-88% and the overhead compared to a representative state-of-the-art barcode scanner improved by 27%. We also showcase two applications built on top of our testbed, one for finding expired items and ingredients of dishes; and one to monitor your health. The pattern that these applications have in common is that they cast the interaction as an item-recommendation problem triggered when the user takes something out. Our testbed could help reveal further user-experience centric interaction patterns and new classes of applications for smart fridges that inherently, by relying on our testbed primitives, mitigate the issues with existing approaches.
[ { "created": "Fri, 3 Jan 2014 04:45:49 GMT", "version": "v1" } ]
2014-01-06
[ [ "Sandholm", "Thomas", "" ], [ "Lee", "Dongman", "" ], [ "Tegelund", "Bjorn", "" ], [ "Han", "Seonyeong", "" ], [ "Shin", "Byoungheon", "" ], [ "Kim", "Byoungoh", "" ] ]
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1401.0587
Stephen Pankavich
Stephen Pankavich and Peter Ortoleva
Nanosystem Self-Assembly Pathways Discovered via All-Atom Multiscale Analysis
3 figures
J. Phys. Chem. B. 116 (2012) 8355-8362
null
null
physics.bio-ph q-bio.BM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider the self-assembly of composite structures from a group of nanocomponents, each consisting of particles within an $N$-atom system. Self-assembly pathways and rates for nanocomposites are derived via a multiscale analysis of the classical Liouville equation. From a reduced statistical framework, rigorous stochastic equations for population levels of beginning, intermediate, and final aggregates are also derived. It is shown that the definition of an assembly type is a self-consistency criterion that must strike a balance between precision and the need for population levels to be slowly varying relative to the time scale of atomic motion. The deductive multiscale approach is complemented by a qualitative notion of multicomponent association and the ensemble of exact atomic-level configurations consistent with them. In processes such as viral self-assembly from proteins and RNA or DNA, there are many possible intermediates, so that it is usually difficult to predict the most efficient assembly pathway. However, in the current study, rates of assembly of each possible intermediate can be predicted. This avoids the need, as in a phenomenological approach, for recalibration with each new application. The method accounts for the feedback across scales in space and time that is fundamental to nanosystem self-assembly. The theory has applications to bionanostructures, geomaterials, engineered composites, and nanocapsule therapeutic delivery systems.
[ { "created": "Fri, 3 Jan 2014 05:23:54 GMT", "version": "v1" } ]
2014-01-06
[ [ "Pankavich", "Stephen", "" ], [ "Ortoleva", "Peter", "" ] ]
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1401.0591
Puneet Kumar
Puneet Kumar, Dharminder Kumar, Narendra Kumar
ICT in Local Self Governance: A Study of Rural India
6 pages, 4 figures, Published with International Journal of Computer Applications (IJCA)
International Journal of Computer Applications 83(6):31-36, December 2013. Published by Foundation of Computer Science, New York, USA
10.5120/14453-2714
null
cs.CY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The concept of local self-governance is not new as it has its roots in ancient time even before the era of Mauryan emperors. This paper depicts the journey of local self-governance from antediluvian time to 21st century. Further, in the current scenario Information and Communication Technology (ICT) has emerged as a successful tool for dissemination of various e-governance services and in this regard the Government of India has formulated NeGP with adequate service delivery mechanism. With the inculcation of ICT, various applications were designed by central as well as state governments which lead towards strengthening of PRIs for rural reform. This paper also throws some light on necessity of ICT in self-governance along with some case studies.
[ { "created": "Fri, 3 Jan 2014 06:09:33 GMT", "version": "v1" } ]
2014-01-06
[ [ "Kumar", "Puneet", "" ], [ "Kumar", "Dharminder", "" ], [ "Kumar", "Narendra", "" ] ]
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1401.0592
Fei Xu
Fei Xu, Bi-cai Zheng, WEi Luo, Yan-qing Lu
The influence of van der Waals forces on the waveguide deformation and power limit of nanoscale optomechanical systems
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null
null
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The ultra-short range force, van der Waals force (VWF), will rise rapidly when one nanoscale waveguide is close to another one, and be stronger than the external transverse gradient force (TGF). We theoretically investigate the giant influence of the VWF on the device performance in a typical optomechanical system consisting of a suspended silicon waveguide and a silica substrate including waveguide deformation stiction and failure mechanism. The device shows unique optically-activated plastic/elastic behaviors and stiction due to the VWF. When the input optical power is above the critical power, the waveguide is sticking to the substrate and the deformation is plastic and unrecoverable, even though the total force is less than the yield strength of the waveguide material. This is important and helpful for the design and applications of optomechanical devices.
[ { "created": "Fri, 3 Jan 2014 06:13:32 GMT", "version": "v1" } ]
2014-01-06
[ [ "Xu", "Fei", "" ], [ "Zheng", "Bi-cai", "" ], [ "Luo", "WEi", "" ], [ "Lu", "Yan-qing", "" ] ]
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1401.0598
Wu Wu
Wu Wu, Jiulin Hu, Xiaofang Huang, Huijie Chen, Bo Sun
Flight trajectory recreation and playback system of aerial mission based on ossimplanet
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null
null
null
cs.HC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Recreation of flight trajectory is important among research areas. The design of a flight trajectory recreation and playback system is presented in this paper. Rather than transferring the flight data to diagram, graph and table, flight data is visualized on the 3D global of ossimPlanet. ossimPlanet is an open-source 3D global geo-spatial viewer and the system realization is based on analysis it. Users are allowed to choose their interested flight of aerial mission. The aerial photographs and corresponding configuration files in which flight data is included would be read in. And the flight statuses would be stored. The flight trajectory is then recreated. Users can view the photographs and flight trajectory marks on the correct positions of 3D global. The scene along flight trajectory is also simulated at the plane's eye point. This paper provides a more intuitive way for recreation of flight trajectory. The cost is decreased remarkably and security is ensured by secondary development on open-source platform.
[ { "created": "Fri, 3 Jan 2014 07:10:25 GMT", "version": "v1" } ]
2014-01-06
[ [ "Wu", "Wu", "" ], [ "Hu", "Jiulin", "" ], [ "Huang", "Xiaofang", "" ], [ "Chen", "Huijie", "" ], [ "Sun", "Bo", "" ] ]
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1401.0606
Sergiy Perepelytsya
O.O. Liubysh, O.M. Alekseev, S.Yu. Tkachov, S.M. Perepelytsya
Effect of ionic ordering in conductivity experiments of DNA aqueous solutions
12 pages, 6figures. Ukr. J. Phys. (2014)
null
null
null
q-bio.BM cond-mat.soft physics.bio-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The effects of ionic ordering in DNA water solutions are studied by conductivity experiments. The conductivity measurements are performed for the solutions of DNA with KCl salt in the temperature range from 28 to 70 C. Salt concentration vary from 0 to 2 M. The conductivity of solutions without DNA but with the same concentration of KCl salt are also performed. The results show that in case of salt free solution of DNA the melting process of the double helix is observed, while in case of DNA solution with added salt the macromolecule denaturation is not featured. For salt concentrations lower than some critical one (0.4 M) the conductivity of DNA solution is higher than the conductivity of KCl water solution without DNA. Starting from the critical concentration the conductivity of KCl solution is higher than the conductivity of DNA solution with added salt. For description of the experimental data phenomenological model is elaborated basing on electrolyte theory. In framework of the developed model a mechanism of counterion ordering is introduced. According to this mechanism under the low salt concentrations electrical conductivity of the system is caused by counterions of DNA ion-hydrate shell. Increasing the amount of salt to the critical concentration counterions condense on DNA polyanion. Further increase of salt concentration leads to the formation of DNA-salt complexes that decreases the conductivity of the system.
[ { "created": "Fri, 3 Jan 2014 08:43:34 GMT", "version": "v1" } ]
2014-01-06
[ [ "Liubysh", "O. O.", "" ], [ "Alekseev", "O. M.", "" ], [ "Tkachov", "S. Yu.", "" ], [ "Perepelytsya", "S. M.", "" ] ]
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1401.0608
Ali Sheharyar
Ali Sheharyar, Othmane Bouhali
A Framework for Creating a Distributed Rendering Environment on the Compute Clusters
null
null
null
null
cs.DC cs.GR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper discusses the deployment of existing render farm manager in a typical compute cluster environment such as a university. Usually, both a render farm and a compute cluster use different queue managers and assume total control over the physical resources. But, taking out the physical resources from an existing compute cluster in a university-like environment whose primary use of the cluster is to run numerical simulations may not be possible. It can potentially reduce the overall resource utilization in a situation where compute tasks are more than rendering tasks. Moreover, it can increase the system administration cost. In this paper, a framework has been proposed that creates a dynamic distributed rendering environment on top of the compute clusters using existing render farm managers without requiring the physical separation of the resources.
[ { "created": "Fri, 3 Jan 2014 08:48:25 GMT", "version": "v1" } ]
2014-01-06
[ [ "Sheharyar", "Ali", "" ], [ "Bouhali", "Othmane", "" ] ]
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1401.0613
Peixiang Lu
Cheng Huang, Pengfei Lan, Yueming Zhou, Qingbin Zhang, Kunlong Liu, and Peixiang Lu
Revisiting the tunnelling site of electrons in strong field enhanced ionization of molecules
null
null
10.1103/PhysRevA.90.043420
null
physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We investigated electron emissions in strong field enhanced ionization of asymmetric diatomic molecules by quantum calculations. It is demonstrated that the widely-used intuitive physical pic- ture, i.e., electron wave packet direct ionization from the up-field site (DIU), is incomplete. Besides DIU, we find another two new ionization channels, the field-induced excitation with subsequent ionization from the down-field site (ESID), and the up-field site (ESIU). The contributions from these channels depend on the molecular asymmetry and internuclear distance. Our work provides a more comprehensive physical picture for the long-standing issue about enhanced ionization of diatomic molecules.
[ { "created": "Fri, 3 Jan 2014 09:28:55 GMT", "version": "v1" } ]
2015-06-18
[ [ "Huang", "Cheng", "" ], [ "Lan", "Pengfei", "" ], [ "Zhou", "Yueming", "" ], [ "Zhang", "Qingbin", "" ], [ "Liu", "Kunlong", "" ], [ "Lu", "Peixiang", "" ] ]
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1401.0614
Paola Gori-Giorgi
Andr\'e Mirtschink, C. J. Umrigar, John D. Morgan III, and Paola Gori-Giorgi
Energy Density Functionals From the Strong-Coupling Limit Applied to the Anions of the He Isoelectronic Series
Accepted for the JCP Special Topic Issue "Advances in DFT Methodology"
null
10.1063/1.4871018
null
physics.chem-ph physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Anions and radicals are important for many applications including environmental chemistry, semiconductors, and charge transfer, but are poorly described by the available approximate energy density functionals. Here we test an approximate exchange-correlation functional based on the exact strong-coupling limit of the Hohenberg-Kohn functional on the prototypical case of the He isoelectronic series with varying nuclear charge $Z<2$, which includes weakly bound negative ions and a quantum phase transition at a critical value of $Z$, representing a big challenge for density functional theory. We use accurate wavefunction calculations to validate our results, comparing energies and Kohn-Sham potentials, thus also providing useful reference data close to and at the quantum phase transition. We show that our functional is able to bind H$^-$ and to capture in general the physics of loosely bound anions, with a tendency to strongly overbind that can be proven mathematically. We also include corrections based on the uniform electron gas which improve the results.
[ { "created": "Fri, 3 Jan 2014 09:38:14 GMT", "version": "v1" }, { "created": "Sun, 6 Apr 2014 10:49:56 GMT", "version": "v2" } ]
2015-06-18
[ [ "Mirtschink", "André", "" ], [ "Umrigar", "C. J.", "" ], [ "Morgan", "John D.", "III" ], [ "Gori-Giorgi", "Paola", "" ] ]
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1401.0615
Anna-Lena Trautmann
Anna-Lena Trautmann
Message Encoding for Spread and Orbit Codes
Submitted to IEEE International Symposium on Information Theory 2014
null
10.1109/ISIT.2014.6875303
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Spread codes and orbit codes are special families of constant dimension subspace codes. These codes have been well-studied for their error correction capability and transmission rate, but the question of how to encode messages has not been investigated. In this work we show how the message space can be chosen for a given code and how message en- and decoding can be done.
[ { "created": "Fri, 3 Jan 2014 10:07:28 GMT", "version": "v1" } ]
2014-09-03
[ [ "Trautmann", "Anna-Lena", "" ] ]
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1401.0616
Colin Cotter
C.J. Cotter and A.T.T. McRae
Compatible finite element methods for numerical weather prediction
To appear in ECMWF Seminar proceedings 2014
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null
null
math.NA physics.ao-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This article takes the form of a tutorial on the use of a particular class of mixed finite element methods, which can be thought of as the finite element extension of the C-grid staggered finite difference method. The class is often referred to as compatible finite elements, mimetic finite elements, discrete differential forms or finite element exterior calculus. We provide an elementary introduction in the case of the one-dimensional wave equation, before summarising recent results in applications to the rotating shallow water equations on the sphere, before taking an outlook towards applications in three-dimensional compressible dynamical cores.
[ { "created": "Fri, 3 Jan 2014 10:20:07 GMT", "version": "v1" } ]
2014-01-06
[ [ "Cotter", "C. J.", "" ], [ "McRae", "A. T. T.", "" ] ]
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1401.0621
Zizheng Cao
Z. Cao, Q. Wang, R. Lu, H.P.A. van den Boom, E. Tangdiongga, and A.M.J. Koonen
Phase modulation parallel optical delay detector for microwave angle-of-arrival measurement with accuracy monitored
null
null
10.1364/OL.39.001497
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A novel phase modulation parallel optical delay detector is proposed for microwave angle-of-arrival (AOA) measurement with accuracy monitored by using only one dual-electrode Mach-Zenhder modulator. A theoretical model is built up to analyze the proposed system including measurement accuracy monitoring. The spatial delay measurement is translated into the phase shift between two replicas of a microwave signal. Thanks to the accuracy monitoring, the phase shifts from 5{\deg} to 165{\deg} are measured with less than 3.1{\deg} measurement error.
[ { "created": "Fri, 3 Jan 2014 10:57:17 GMT", "version": "v1" } ]
2015-06-18
[ [ "Cao", "Z.", "" ], [ "Wang", "Q.", "" ], [ "Lu", "R.", "" ], [ "Boom", "H. P. A. van den", "" ], [ "Tangdiongga", "E.", "" ], [ "Koonen", "A. M. J.", "" ] ]
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1401.0625
Yakov Nekrich
Moshe Lewenstein, Yakov Nekrich, Jeffrey Scott Vitter
Space-Efficient String Indexing for Wildcard Pattern Matching
15 pages, extended version of the STACS paper
null
null
null
cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper we describe compressed indexes that support pattern matching queries for strings with wildcards. For a constant size alphabet our data structure uses $O(n\log^{\varepsilon}n)$ bits for any $\varepsilon>0$ and reports all $\mathrm{occ}$ occurrences of a wildcard string in $O(m+\sigma^g \cdot\mu(n) + \mathrm{occ})$ time, where $\mu(n)=o(\log\log\log n)$, $\sigma$ is the alphabet size, $m$ is the number of alphabet symbols and $g$ is the number of wildcard symbols in the query string. We also present an $O(n)$-bit index with $O((m+\sigma^g+\mathrm{occ})\log^{\varepsilon}n)$ query time and an $O(n(\log\log n)^2)$-bit index with $O((m+\sigma^g+\mathrm{occ})\log\log n)$ query time. These are the first non-trivial data structures for this problem that need $o(n\log n)$ bits of space.
[ { "created": "Fri, 3 Jan 2014 11:08:34 GMT", "version": "v1" } ]
2014-01-06
[ [ "Lewenstein", "Moshe", "" ], [ "Nekrich", "Yakov", "" ], [ "Vitter", "Jeffrey Scott", "" ] ]
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1401.0629
Thomas Niebler
Stephan Doerfel and Daniel Zoller and Philipp Singer and Thomas Niebler and Andreas Hotho and Markus Strohmaier
Of course we share! Testing Assumptions about Social Tagging Systems
null
null
null
null
cs.IR cs.DL cs.SI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Social tagging systems have established themselves as an important part in today's web and have attracted the interest from our research community in a variety of investigations. The overall vision of our community is that simply through interactions with the system, i.e., through tagging and sharing of resources, users would contribute to building useful semantic structures as well as resource indexes using uncontrolled vocabulary not only due to the easy-to-use mechanics. Henceforth, a variety of assumptions about social tagging systems have emerged, yet testing them has been difficult due to the absence of suitable data. In this work we thoroughly investigate three available assumptions - e.g., is a tagging system really social? - by examining live log data gathered from the real-world public social tagging system BibSonomy. Our empirical results indicate that while some of these assumptions hold to a certain extent, other assumptions need to be reflected and viewed in a very critical light. Our observations have implications for the design of future search and other algorithms to better reflect the actual user behavior.
[ { "created": "Fri, 3 Jan 2014 11:59:34 GMT", "version": "v1" }, { "created": "Thu, 27 Mar 2014 13:03:32 GMT", "version": "v2" }, { "created": "Fri, 28 Mar 2014 09:41:21 GMT", "version": "v3" } ]
2014-03-31
[ [ "Doerfel", "Stephan", "" ], [ "Zoller", "Daniel", "" ], [ "Singer", "Philipp", "" ], [ "Niebler", "Thomas", "" ], [ "Hotho", "Andreas", "" ], [ "Strohmaier", "Markus", "" ] ]
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1401.0630
Nikita Tarasov
E. G. Turitsyna, S. V. Smirnov, S. Sugavanam, N. Tarasov, X. Shu, S. A. Babin, E. V. Podivilov, D. V. Churkin, G. Falkovich, S. K. Turitsyn
The laminar-turbulent transition in a fibre laser
27 pages, 12 figures
Nature Photonics 7, 783-786 (2013)
10.1038/nphoton.2013.246
null
physics.optics physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Studying transition to a highly disordered state of turbulence from a linearly stable coherent laminar state is conceptually and technically challenging and immensely important, e.g. all pipe and channel flows are of that type. In optics, understanding how systems lose coherence with increase of spatial size or excitation level is an open fundamental problem of practical importance. Here we identify, arguably, the simplest system where this classical problem can be studied: we learnt to operate a fibre laser in laminar and turbulent regimes. We show that laminar phase is an analogue of a one-dimensional coherent condensate and turbulence onset is through a spatial loss of coherence. We discover a new mechanism of laminar-turbulent transition in laser operation: condensate destruction by the clustering of dark and grey solitons. This is important both for the design of devices exploiting coherent dynamics and for conceptually new technologies based on systems operating far from thermodynamic equilibrium.
[ { "created": "Fri, 3 Jan 2014 12:02:44 GMT", "version": "v1" } ]
2014-01-06
[ [ "Turitsyna", "E. G.", "" ], [ "Smirnov", "S. V.", "" ], [ "Sugavanam", "S.", "" ], [ "Tarasov", "N.", "" ], [ "Shu", "X.", "" ], [ "Babin", "S. A.", "" ], [ "Podivilov", "E. V.", "" ], [ "Churkin", "D. V.", "" ], [ "Falkovich", "G.", "" ], [ "Turitsyn", "S. K.", "" ] ]
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1401.0636
Franz X. Bronold
Elena Thiessen, Rafael L. Heinisch, Franz X. Bronold, and Holger Fehske
Infrared light extinction by charged dielectric core-coat particles
12 pages, 8 figures
Eur. Phys. J. D 68, 98 (2014)
10.1140/epjd/e2014-50009-7
null
physics.plasm-ph physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the effect of surplus electrons on the infrared extinction of dielectric particles with a core-coat structure and propose to use it for an optical measurement of the particle charge in a dusty plasma. The particles consist of an inner core with negative and an outer coat with positive electron affinity. Both the core and the coat give rise to strong transverse optical phonon resonances, leading to anomalous light scattering in the infrared. Due to the radial profile of the electron affinity electrons accumulate in the coat region making the infrared extinction of this type of particles very charge-sensitive, in particular, the extinction due to a resonance arising solely due to the core-coat structure. The maximum of this resonance is in the far-infrared and responds to particle charges realizable in ordinary dusty laboratory plasmas.
[ { "created": "Fri, 3 Jan 2014 12:27:36 GMT", "version": "v1" } ]
2014-04-30
[ [ "Thiessen", "Elena", "" ], [ "Heinisch", "Rafael L.", "" ], [ "Bronold", "Franz X.", "" ], [ "Fehske", "Holger", "" ] ]
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1401.0640
Tarek El-Shishtawy Ahmed
Fatma El-Ghannam and Tarek El-Shishtawy
Multi-Topic Multi-Document Summarizer
null
International Journal of Computer Science & Information Technology (IJCSIT) Vol 5, No 6, December 2013
10.5121/ijcsit
null
cs.CL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Current multi-document summarization systems can successfully extract summary sentences, however with many limitations including: low coverage, inaccurate extraction to important sentences, redundancy and poor coherence among the selected sentences. The present study introduces a new concept of centroid approach and reports new techniques for extracting summary sentences for multi-document. In both techniques keyphrases are used to weigh sentences and documents. The first summarization technique (Sen-Rich) prefers maximum richness sentences. While the second (Doc-Rich), prefers sentences from centroid document. To demonstrate the new summarization system application to extract summaries of Arabic documents we performed two experiments. First, we applied Rouge measure to compare the new techniques among systems presented at TAC2011. The results show that Sen-Rich outperformed all systems in ROUGE-S. Second, the system was applied to summarize multi-topic documents. Using human evaluators, the results show that Doc-Rich is the superior, where summary sentences characterized by extra coverage and more cohesion.
[ { "created": "Fri, 3 Jan 2014 13:07:29 GMT", "version": "v1" } ]
2014-01-06
[ [ "El-Ghannam", "Fatma", "" ], [ "El-Shishtawy", "Tarek", "" ] ]
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1401.0642
Uri Levy
Uri Levy and Yaron Silberberg
Electrical-Field Distributions in Waveguide Arrays - Exact and Approximate
93 pages, 67 figures
null
null
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Five methods of calculating electrical field distributions in one dimensional wave-guide arrays are reviewed. We analytically solve the scalar Helmholtz Equation and, based on the computed Bloch functions and associated bands of propagation constants, generate the exact field distribution maps. For the approximated slowly varying envelope equation we show that the base Bloch functions are identical to those in the exact case, and study the differences in the bands of propagation constants. We demonstrate that by selecting the reference refractive index value, it is possible to minimize the error in propagation constants of any desired band. For the distributions calculated by the coupled mode theory, we reveal the similarity and differences of the band made of eigenvalues of the coupled mode equations matrix when compared to the first band of propagation constants found by the exact solution. Analysis of two numeric beam propagation methods shows that the relative accuracy of the calculated field distributions of each of these methods depends on excitation conditions. The presented analysis of the slowly varying envelope equation provides guide lines for selecting the value of the reference refractive index to be incorporated in these numeric methods where an analytic solution is difficult to work out or in the frequently occurring cases where an analytic solution does not exist at all.
[ { "created": "Fri, 3 Jan 2014 13:12:38 GMT", "version": "v1" }, { "created": "Mon, 6 Jan 2014 07:28:28 GMT", "version": "v2" }, { "created": "Thu, 27 Feb 2014 10:38:38 GMT", "version": "v3" }, { "created": "Fri, 21 Mar 2014 15:57:04 GMT", "version": "v4" } ]
2014-03-24
[ [ "Levy", "Uri", "" ], [ "Silberberg", "Yaron", "" ] ]
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1401.0643
Benjamin Favier
B. Favier, A.J. Barker, C. Baruteau and G.I. Ogilvie
Nonlinear evolution of tidally forced inertial waves in rotating fluid bodies
17 pages, 17 figures, accepted for publication in MNRAS
null
10.1093/mnras/stu003
null
astro-ph.EP physics.flu-dyn physics.geo-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We perform one of the first studies into the nonlinear evolution of tidally excited inertial waves in a uniformly rotating fluid body, exploring a simplified model of the fluid envelope of a planet (or the convective envelope of a solar-type star) subject to the gravitational tidal perturbations of an orbiting companion. Our model contains a perfectly rigid spherical core, which is surrounded by an envelope of incompressible uniform density fluid. The corresponding linear problem was studied in previous papers which this work extends into the nonlinear regime, at moderate Ekman numbers (the ratio of viscous to Coriolis accelerations). By performing high-resolution numerical simulations, using a combination of pseudo-spectral and spectral element methods, we investigate the effects of nonlinearities, which lead to time-dependence of the flow and the corresponding dissipation rate. Angular momentum is deposited non-uniformly, leading to the generation of significant differential rotation in the initially uniformly rotating fluid, i.e. the body does not evolve towards synchronism as a simple solid body rotator. This differential rotation modifies the properties of tidally excited inertial waves, changes the dissipative properties of the flow, and eventually becomes unstable to a secondary shear instability provided that the Ekman number is sufficiently small. Our main result is that the inclusion of nonlinearities eventually modifies the flow and the resulting dissipation from what linear calculations would predict, which has important implications for tidal dissipation in fluid bodies. We finally discuss some limitations of our simplified model, and propose avenues for future research to better understand the tidal evolution of rotating planets and stars.
[ { "created": "Fri, 3 Jan 2014 13:16:00 GMT", "version": "v1" } ]
2014-03-05
[ [ "Favier", "B.", "" ], [ "Barker", "A. J.", "" ], [ "Baruteau", "C.", "" ], [ "Ogilvie", "G. I.", "" ] ]
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1401.0645
Matthew England Dr
Russell Bradford, James H. Davenport, Matthew England, Scott McCallum and David Wilson
Truth Table Invariant Cylindrical Algebraic Decomposition
40 pages
Journal of Symbolic Computation 76, pp. 1-35, 2016
10.1016/j.jsc.2015.11.002
null
cs.SC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
When using cylindrical algebraic decomposition (CAD) to solve a problem with respect to a set of polynomials, it is likely not the signs of those polynomials that are of paramount importance but rather the truth values of certain quantifier free formulae involving them. This observation motivates our article and definition of a Truth Table Invariant CAD (TTICAD). In ISSAC 2013 the current authors presented an algorithm that can efficiently and directly construct a TTICAD for a list of formulae in which each has an equational constraint. This was achieved by generalising McCallum's theory of reduced projection operators. In this paper we present an extended version of our theory which can be applied to an arbitrary list of formulae, achieving savings if at least one has an equational constraint. We also explain how the theory of reduced projection operators can allow for further improvements to the lifting phase of CAD algorithms, even in the context of a single equational constraint. The algorithm is implemented fully in Maple and we present both promising results from experimentation and a complexity analysis showing the benefits of our contributions.
[ { "created": "Fri, 3 Jan 2014 13:23:05 GMT", "version": "v1" }, { "created": "Tue, 30 Dec 2014 14:49:59 GMT", "version": "v2" }, { "created": "Fri, 13 Nov 2015 18:08:13 GMT", "version": "v3" } ]
2016-02-23
[ [ "Bradford", "Russell", "" ], [ "Davenport", "James H.", "" ], [ "England", "Matthew", "" ], [ "McCallum", "Scott", "" ], [ "Wilson", "David", "" ] ]
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1401.0647
Matthew England Dr
D.J. Wilson, R.J. Bradford, J.H. Davenport and M. England
Cylindrical Algebraic Sub-Decompositions
26 pages
Mathematics in Computer Science: Volume 8, Issue 2, pages 263-288, Springer, 2014
10.1007/s11786-014-0191-z
null
cs.SC math.AG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Cylindrical algebraic decompositions (CADs) are a key tool in real algebraic geometry, used primarily for eliminating quantifiers over the reals and studying semi-algebraic sets. In this paper we introduce cylindrical algebraic sub-decompositions (sub-CADs), which are subsets of CADs containing all the information needed to specify a solution for a given problem. We define two new types of sub-CAD: variety sub-CADs which are those cells in a CAD lying on a designated variety; and layered sub-CADs which have only those cells of dimension higher than a specified value. We present algorithms to produce these and describe how the two approaches may be combined with each other and the recent theory of truth-table invariant CAD. We give a complexity analysis showing that these techniques can offer substantial theoretical savings, which is supported by experimentation using an implementation in Maple.
[ { "created": "Fri, 3 Jan 2014 13:49:31 GMT", "version": "v1" }, { "created": "Thu, 24 Apr 2014 11:27:56 GMT", "version": "v2" } ]
2014-06-27
[ [ "Wilson", "D. J.", "" ], [ "Bradford", "R. J.", "" ], [ "Davenport", "J. H.", "" ], [ "England", "M.", "" ] ]
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1401.0648
Carl Mummert
Carl Mummert, Alaeddine Saadaoui, Sean Sovine
The modal logic of Reverse Mathematics
null
Archive for Mathematical Logic May 2015, Volume 54, Issue 3-4, pp 425-437
10.1007/s00153-015-0417-z
null
math.LO cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The implication relationship between subsystems in Reverse Mathematics has an underlying logic, which can be used to deduce certain new Reverse Mathematics results from existing ones in a routine way. We use techniques of modal logic to formalize the logic of Reverse Mathematics into a system that we name s-logic. We argue that s-logic captures precisely the "logical" content of the implication and nonimplication relations between subsystems in Reverse Mathematics. We present a sound, complete, decidable, and compact tableau-style deductive system for s-logic, and explore in detail two fragments that are particularly relevant to Reverse Mathematics practice and automated theorem proving of Reverse Mathematics results.
[ { "created": "Fri, 3 Jan 2014 13:51:02 GMT", "version": "v1" } ]
2015-04-21
[ [ "Mummert", "Carl", "" ], [ "Saadaoui", "Alaeddine", "" ], [ "Sovine", "Sean", "" ] ]
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1401.0654
Weihua Deng Professor
Weihua Deng, Minghua Chen, Eli Barkai
Numerical algorithms for the forward and backward fractional Feynman-Kac equations
27 pages, 8 figures
Journal of Scientific Computing, 62(3), 718-746, 2015
10.1007/s10915-014-9873-6
null
physics.comp-ph math.NA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Feynman-Kac equations are a type of partial differential equations describing the distribution of functionals of diffusive motion. The probability density function (PDF) of Brownian functionals satisfies the Feynman-Kac formula, being a Schr\"{o}dinger equation in imaginary time. The functionals of no-Brownian motion, or anomalous diffusion, follow the fractional Feynman-Kac equation [J. Stat. Phys. 141, 1071-1092, 2010], where the fractional substantial derivative is involved. Based on recently developed discretized schemes for fractional substantial derivatives [arXiv:1310.3086], this paper focuses on providing algorithms for numerically solving the forward and backward fractional Feynman-Kac equations; since the fractional substantial derivative is non-local time-space coupled operator, new challenges are introduced comparing with the general fractional derivative. Two ways (finite difference and finite element) of discretizing the space derivative are considered. For the backward fractional Feynman-Kac equation, the numerical stability and convergence of the algorithms with first order accuracy are theoretically discussed; and the optimal estimates are obtained. For all the provided schemes, including the first order and high order ones, of both forward and backward Feynman-Kac equations, extensive numerical experiments are performed to show their effectiveness.
[ { "created": "Fri, 3 Jan 2014 14:29:29 GMT", "version": "v1" } ]
2015-02-03
[ [ "Deng", "Weihua", "" ], [ "Chen", "Minghua", "" ], [ "Barkai", "Eli", "" ] ]
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1401.0655
Robert Gilles
Owen Sims and Robert P. Gilles
Critical Nodes In Directed Networks
28 pages, 6 figures, 2 tables
null
null
null
cs.SI physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Critical nodes or "middlemen" have an essential place in both social and economic networks when considering the flow of information and trade. This paper extends the concept of critical nodes to directed networks. We identify strong and weak middlemen. Node contestability is introduced as a form of competition in networks; a duality between uncontested intermediaries and middlemen is established. The brokerage power of middlemen is formally expressed and a general algorithm is constructed to measure the brokerage power of each node from the networks adjacency matrix. Augmentations of the brokerage power measure are discussed to encapsulate relevant centrality measures. We use these concepts to identify and measure middlemen in two empirical socio-economic networks, the elite marriage network of Renaissance Florence and Krackhardt's advice network.
[ { "created": "Fri, 3 Jan 2014 15:16:31 GMT", "version": "v1" }, { "created": "Sat, 1 Feb 2014 16:03:36 GMT", "version": "v2" } ]
2014-02-04
[ [ "Sims", "Owen", "" ], [ "Gilles", "Robert P.", "" ] ]
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1401.0657
Ricard Menchon-Enrich
Ricard Menchon-Enrich, Suzanne McEndoo, Jordi Mompart, Veronica Ahufinger, Thomas Busch
Tunneling-induced angular momentum for single cold atoms
6 pages, 5 figures
Phys. Rev. A 89, 013626 (2014)
10.1103/PhysRevA.89.013626
null
quant-ph cond-mat.quant-gas physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the generation of angular momentum carrying states for a single cold particle by breaking the symmetry of a spatial adiabatic passage process in a two-dimensional system consisting of three harmonic potential wells. By following a superposition of two eigenstates of the system, a single cold particle is completely transferred to the degenerate first excited states of the final trap, which are resonantly coupled via tunneling to the ground states of the initial and middle traps. Depending on the total time of the process, angular momentum is generated in the final trap, with values that oscillate between $\pm\hbar$. This process is discussed in terms of the asymptotic eigenstates of the individual wells and the results have been checked by simulations of the full two-dimensional Schr\"odinger equation.
[ { "created": "Fri, 3 Jan 2014 15:26:45 GMT", "version": "v1" } ]
2014-04-02
[ [ "Menchon-Enrich", "Ricard", "" ], [ "McEndoo", "Suzanne", "" ], [ "Mompart", "Jordi", "" ], [ "Ahufinger", "Veronica", "" ], [ "Busch", "Thomas", "" ] ]
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1401.0658
Stefan Ulrych
S. Ulrych
Conformal relativity with hypercomplex variables
null
Proc. R. Soc. A 470:20140027 (2014)
10.1098/rspa.2014.0027
null
physics.gen-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Majorana's arbitrary spin theory is considered in a hyperbolic complex representation. The underlying differential equation is embedded into the gauge field theories of Sachs and Carmeli. In particular, the approach of Sachs can serve as a unified theory of general relativity and electroweak interactions. The method is extended to conformal space with the intention to introduce the strong interaction. It is then possible to use the wave equation, operating on representation functions of the conformal group, to describe the dynamics of matter fields. The resulting gauge groups resemble closely the gauge symmetries of Glashow-Salam-Weinberg and the Standard Model.
[ { "created": "Wed, 1 Jan 2014 08:10:00 GMT", "version": "v1" }, { "created": "Sat, 17 May 2014 04:32:34 GMT", "version": "v2" }, { "created": "Sun, 15 Jun 2014 05:26:46 GMT", "version": "v3" }, { "created": "Sat, 13 Sep 2014 14:32:45 GMT", "version": "v4" } ]
2014-09-16
[ [ "Ulrych", "S.", "" ] ]
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