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1402.1232
Matthew Petrasiunas
M.J. Petrasiunas, J.B.O. Wood, D. Kielpinski, E.W. Streed
Three-photon excitation of quantum dots with a telecom band ultrafast fiber laser
6 pages, 3 figures
null
10.1007/s00340-014-5924-9
null
physics.optics cond-mat.mes-hall
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We demonstrate three-photon excitation in quantum dots with a mode-locked fiber laser operating in the telecommunications band. We compare spectra and intensity dependence of fluorescence from one- and three-photon excitation of commercially available 640 nm quantum dots, using a 372 nm diode laser for one-photon excitation and 116 fs pulses from a mode-locked fiber laser with a center wavelength of 1575 nm for three-photon excitation.
[ { "created": "Thu, 6 Feb 2014 02:17:57 GMT", "version": "v1" } ]
2015-06-18
[ [ "Petrasiunas", "M. J.", "" ], [ "Wood", "J. B. O.", "" ], [ "Kielpinski", "D.", "" ], [ "Streed", "E. W.", "" ] ]
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1402.1233
Thomas K\"uhne
Thomas Spura, Christopher John, Scott Habershon and Thomas D. K\"uhne
Nuclear quantum effects in liquid water from path-integral simulations using an ab initio force matching approach
15 pages, 11 figures, 2 tables
Mol. Phys. 113, 808 (2015)
10.1080/00268976.2014.981231
null
physics.chem-ph cond-mat.soft cond-mat.stat-mech physics.comp-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We have applied path integral simulations, in combination with new ab initio based water potentials, to investigate nuclear quantum effects in liquid water. Because direct ab initio path integral simulations are computationally expensive, a flexible water model is parameterized by force-matching to density functional theory-based molecular dynamics simulations. The resulting effective potentials provide an inexpensive replacement for direct ab inito molecular dynamics simulations and allow efficient simulation of nuclear quantum effects. Static and dynamic properties of liquid water at ambient conditions are presented and the role of nuclear quantum effects, exchange-correlation functionals and dispersion corrections are discussed in regards to reproducing the experimental properties of liquid water.
[ { "created": "Thu, 6 Feb 2014 03:06:56 GMT", "version": "v1" }, { "created": "Wed, 12 Feb 2014 17:32:56 GMT", "version": "v2" } ]
2015-04-21
[ [ "Spura", "Thomas", "" ], [ "John", "Christopher", "" ], [ "Habershon", "Scott", "" ], [ "Kühne", "Thomas D.", "" ] ]
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1402.1241
Shafi'i Muhammad Abdulhamid Mr
Shafii Muhammad Abdulhamid, Ismaila Idris
Design Evaluation of Some Nigerian University Portals: A Programmer's Point of View
8 pages. Computer Science and Telecommunications 2010
null
null
null
cs.CY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Today, Nigerian Universities feel pressured to get a portal up and running dynamic, individualized web systems have become essential for institutions of higher learning. As a result, most of the Nigerian University portals nowadays do not meet up to standard. In this paper, ten Nigerian University portals were selected and their design evaluated in accordance with the international best practices. The result was revealing.
[ { "created": "Thu, 6 Feb 2014 04:25:53 GMT", "version": "v1" } ]
2014-02-07
[ [ "Abdulhamid", "Shafii Muhammad", "" ], [ "Idris", "Ismaila", "" ] ]
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1402.1242
Shafi'i Muhammad Abdulhamid Mr
Ismaila Idris, Shafii Muhammad Abdulhamid
An Improved AIS Based E-mail Classification Technique for Spam Detection
6 pages, 2 figures, 1 table
The Eighth International Conference on eLearning for Knowledge-Based Society, 23-24 February 2012, Thailand
null
null
cs.CR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
An improved email classification method based on Artificial Immune System is proposed in this paper to develop an immune based system by using the immune learning, immune memory in solving complex problems in spam detection. An optimized technique for e-mail classification is accomplished by distinguishing the characteristics of spam and non-spam that is been acquired from trained data set. These extracted features of spam and non-spam are then combined to make a single detector, therefore reducing the false rate. (Non-spam that were wrongly classified as spam). Effectiveness of our technique in decreasing the false rate shall be demonstrated by the result that will be acquired.
[ { "created": "Thu, 6 Feb 2014 04:27:50 GMT", "version": "v1" } ]
2014-02-07
[ [ "Idris", "Ismaila", "" ], [ "Abdulhamid", "Shafii Muhammad", "" ] ]
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1402.1243
Shafi'i Muhammad Abdulhamid Mr
Shafii Muhammad Abdulhamid, Gana Usman
Destination Information Management System for Tourist
8 pages. Computer Science and Telecommunications 2010
null
null
null
cs.HC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The use of information and communication technology in our day to day activities is now unavoidable. In tourism developments, destination information and management systems are used to guide visitors and provide information to both visitors and management of the tour sites. In this paper, information and navigation system was designed for tourists, taking some Niger state of Nigeria tourism destinations into account. The information management system was designed using Java Applet (NetBeans IDE 6.1), Hypertext MarkUp Language (HTML), Personal Home Page (PHP), Java script and MySQL as the back-end integration database. Two different MySQL servers were used, the MySQL query browser and the WAMP5 server to compare the effectiveness of the system developed.
[ { "created": "Thu, 6 Feb 2014 04:30:39 GMT", "version": "v1" } ]
2014-02-07
[ [ "Abdulhamid", "Shafii Muhammad", "" ], [ "Usman", "Gana", "" ] ]
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1402.1245
Aruna G.R
Ms.Aruna.G.R, Mr.SivanArulSelvan
A Survey on Delay-Aware Network Structure for Wireless Sensor Networks with Consecutive Data Collection Processes
4 pages,3 figures, "Published with International Journal of Engineering Trends and Technology (IJETT)"
IJETT, 7(4),198-201, 2014 published by seventh sense research group
10.14445/22315381/IJETT-V7P240
null
cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A Wireless Sensor Network (WSN) consists of spatially distributed autonomous sensors to monitor physical or environmental conditions, such as temperature, sound, pressure,etc. In sensing applications, data packets are flowing from sensor nodes to base station. In data collection processes, bottom up approach is used. In bottom up approach, all nodes send their sensed data packets to base station directly. In this approach will lead to increased delay, which will lead to higher energy consumption. To reduce the energy consumption of sensor nodes,Clustering Algorithm and Low-Energy Adaptive Clustering Hierarchy (LEACH) are being used. Efficient gathering in Wireless Sensor information systems, Power Efficient Gathering in Sensor Information System (PEGASIS) is being used. There are lot of research issues in Wireless Sensor Networks such as delay, lifetime of network, energy dissipation which needs to be resolved.
[ { "created": "Thu, 6 Feb 2014 05:10:55 GMT", "version": "v1" } ]
2014-02-07
[ [ "R", "Ms. Aruna. G.", "" ], [ "SivanArulSelvan", "Mr.", "" ] ]
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1402.1246
Rubia R
Ms.Rubia.R, Mr.SivanArulSelvan
A Survey on Mobile Data Gathering in Wireless Sensor Networks - Bounded Relay
4 pages, 1 figure, "Published with International Journal of Engineering Trends and Technology (IJETT)"
IJETT, 7(5),205-208,2014 published by seventh sense research group
10.14445/22315381/IJETT-V7P247
null
cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Most of the wireless sensor networks consist of static sensors, which can be deployed in a wide environment for monitoring applications. While transmitting the data from source to static sink, the amount of energy consumption of the sensor node is high. It results in reduced lifetime of the network.Some of the WSN architectures have been proposed based on Mobile Elements. There is large number of approaches to resolve the above problem. It is found those two approaches, namely Single Hop Data Gathering problem (SHDGP) and mobile Data Gathering, which is used to increase the lifetime of the network. Single Hop Data Gathering Problem is used to achieve the uniform energy consumption. The mobile Data Gathering algorithm is used to find the minimal set of points in the sensor network, which serves as data gathering points for mobile network. Even after so many decades of research, there are some unresolved problems like non uniform energy consumption, increased latency, which needs to be resolved.
[ { "created": "Thu, 6 Feb 2014 05:11:35 GMT", "version": "v1" } ]
2014-02-07
[ [ "R", "Ms. Rubia.", "" ], [ "SivanArulSelvan", "Mr.", "" ] ]
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1402.1248
Michael Biercuk
Michael W Lee, Marie Claire Jarratt, Christian Marciniak, and Michael J Biercuk
Frequency Stabilization of a 369 nm Diode Laser by Nonlinear Spectroscopy of Ytterbium Ions in a Discharge
Related papers available at http://www.physics.usyd.edu.au/~mbiercuk/Publications.html
null
10.1364/OE.22.007210
null
physics.atom-ph physics.optics quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We demonstrate stabilisation of an ultraviolet diode laser via Doppler free spectroscopy of Ytterbium ions in a discharge. Our technique employs polarization spectroscopy, which produces a natural dispersive lineshape whose zero-crossing is largely immune to environmental drifts, making this signal an ideal absolute frequency reference for Yb$^+$ ion trapping experiments. We stabilise an external-cavity diode laser near 369 nm for cooling Yb$^+$ ions, using amplitude-modulated polarisation spectroscopy and a commercial PID feedback system. We achieve stable, low-drift locking with a standard deviation of measured laser frequency ~400 kHz over 10 minutes, limited by the instantaneous linewidth of the diode laser. These results and the simplicity of our optical setup makes our approach attractive for stabilization of laser sources in atomic-physics applications.
[ { "created": "Thu, 6 Feb 2014 05:18:34 GMT", "version": "v1" } ]
2015-06-18
[ [ "Lee", "Michael W", "" ], [ "Jarratt", "Marie Claire", "" ], [ "Marciniak", "Christian", "" ], [ "Biercuk", "Michael J", "" ] ]
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1402.1252
Manojkumar M. K.
Manojkumar.M.K, Sathya.D
A Survey on an Effective Defense Mechanism against Reactive Jamming Attacks in WSN
4 pages,3 figures,"Published with International Journal of Computer Trends and Technology (IJCTT)"
IJCTT 7(3):143-146, January 2014. Published by Seventh Sense Research Group
10.14445/22312803/IJCTT-V7P129
null
cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A Wireless Sensor Network (WSN) is a self-configure network of sensor nodes communicate among themselves using radio signals and deployed in quantity to sense, monitor and to understand the physical world. A jammer is an entity which interferes with the physical transmission and reception of wireless communications. Reactive jamming attack is a major security problem in the wireless sensor network. The reactive jammer stays quiet when the channel is idle. The jammer starts transmitting a radio signal as soon as it senses activity on the channel. The reactive jammer nodes will be deactivated by identifying all the trigger nodes, at the same time a jammer node is localized by exploiting the changes in the neighbor nodes. The affected node can be identified, by analyzing the changes in its communication range, compared to its neighbors. The paper proposes a survey on trigger node identification and a detailed survey on techniques to identify trigger nodes and highly concentrated on the reactive jammer.
[ { "created": "Thu, 6 Feb 2014 05:34:32 GMT", "version": "v1" } ]
2014-02-07
[ [ "K", "Manojkumar. M.", "" ], [ "D", "Sathya.", "" ] ]
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1402.1254
Hua Xia Dr
H. Xia, N. Francois, H. Punzmann and M. Shats
Taylor particle dispersion during transition to fully developed two-dimensional turbulence
5 pages, 4 figures
Physical Review Letters, 112, 104501(2014)
10.1103/PhysRevLett.112.104501
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We report new measurements of single particle dispersion in turbulent two-dimensional (2D) flows. Laboratory experiments in electromagnetically driven and Faraday wave driven turbulence reveal a transition from weakly dispersing superdiffusive regime to strongly dispersing Brownian diffusion as the flow energy is increased in a broad range. The transition to fully developed 2D turbulence is characterized by the topological changes in the fluid particle trajectories and the development of self-similar diffusion. The degree of 2D turbulence development can be quantified by a parameter describing the deviation of single particle dispersion from the Taylor dispersion.
[ { "created": "Thu, 6 Feb 2014 05:56:52 GMT", "version": "v1" } ]
2015-06-18
[ [ "Xia", "H.", "" ], [ "Francois", "N.", "" ], [ "Punzmann", "H.", "" ], [ "Shats", "M.", "" ] ]
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1402.1257
Nishant Vadnere
Nishant Vadnere, R.G.Mehta, D.P.Rana, N.J.Mistry and M.M.Raghuwanshi
Incremental classification using Feature Tree
5 Pages, 1 figure, International conference on recent trends and innovations in engineering and technology - 2013 (ICRTIET-2013)
null
null
null
cs.DB
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In recent years, stream data have become an immensely growing area of research for the database, computer science and data mining communities. Stream data is an ordered sequence of instances. In many applications of data stream mining data can be read only once or a small number of times using limited computing and storage capabilities. Some of the issues occurred in classifying stream data that have significant impact in algorithm development are size of database, online streaming, high dimensionality and concept drift. The concept drift occurs when the properties of the historical data and target variable change over time abruptly in such a case that the predictions will become inaccurate as time passes. In this paper the framework of incremental classification is proposed to solve the issues for the classification of stream data. The Trie structure based incremental feature tree, Trie structure based incremental FP (Frequent Pattern) growth tree and tree based incremental classification algorithm are introduced in the proposed framework.
[ { "created": "Thu, 6 Feb 2014 06:17:18 GMT", "version": "v1" }, { "created": "Fri, 7 Feb 2014 17:34:51 GMT", "version": "v2" } ]
2014-02-10
[ [ "Vadnere", "Nishant", "" ], [ "Mehta", "R. G.", "" ], [ "Rana", "D. P.", "" ], [ "Mistry", "N. J.", "" ], [ "Raghuwanshi", "M. M.", "" ] ]
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1402.1258
Vishal Verma
Mohit Kumar Gupta, Vishal Verma, Megha Singh Verma
In-Memory Database Systems - A Paradigm Shift
Pages-4, Figures-1, Published with International Journal of Engineering Trends and Technology (IJETT)
International Journal of Engineering Trends and Technology (IJETT) 6(6):333-336, Dec. 2013. Published by Seventh Sense Research Group
null
null
cs.DB
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In today world, organizations like Google, Yahoo, Amazon, Facebook etc. are facing drastic increase in data. This leads to the problem of capturing, storing, managing and analyzing terabytes or petabytes of data, stored in multiple formats, from different internal and external sources. Moreover, new applications scenarios like weather forecasting, trading, artificial intelligence etc. need huge data processing in real time. These requirements exceed the processing capacity of traditional on-disk database management systems to manage this data and to give speedy real time results. Therefore, data management needs new solutions for coping with the challenges of data volumes and processing data in real-time. An in-memory database system (IMDS) is a latest breed of database management system which is becoming answer to above challenges with other supporting technologies. IMDS is capable to process massive data distinctly faster. This paper explores IMDS approach and its associated design issues and challenges. It also investigates some famous commercial and open-source IMDS solutions available in the market.
[ { "created": "Thu, 6 Feb 2014 06:17:51 GMT", "version": "v1" } ]
2014-02-07
[ [ "Gupta", "Mohit Kumar", "" ], [ "Verma", "Vishal", "" ], [ "Verma", "Megha Singh", "" ] ]
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1402.1259
Fahhad Alharbi
Raka Jovanovic and Sabre Kais and Fahhad H. Alharbi
Efficient method for localized functions using domain transformation and Fourier sine series
16 pages, 3 figures
Molecular Physics ahead-of-print (2013): 1-8
10.1080/00268976.2013.859311
null
quant-ph math.NA physics.comp-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
An efficient approach to handle localized states by using spectral methods (SM) in one and three dimensions is presented. The method consists of transformation of the infinite domain to the bounded domain in $(0, \pi)$ and using the Fourier sine series as a set of basis functions for the SM. It is shown that with an appropriate choice of transformation functions, this method manages to preserve the good properties of original SMs; more precisely, superb computational efficiency when high level of accuracy is necessary. This is made possible by analytically exploiting the properties of the transformation function and the Fourier sine series. An especially important property of this approach is the possibility of calculating the Hartree energy very efficiently. This is done by exploiting the positive properties of the sine series as a basis set and conducting an extinctive part of the calculations analytically. We illustrate the efficiency of this method and implement it to solve the Poisson's and Helmholtz equations in both one and three dimensions. The efficiency of the method is verified through a comparison to recently published results for both one and three dimensional problems.
[ { "created": "Thu, 6 Feb 2014 06:29:16 GMT", "version": "v1" } ]
2014-02-07
[ [ "Jovanovic", "Raka", "" ], [ "Kais", "Sabre", "" ], [ "Alharbi", "Fahhad H.", "" ] ]
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1402.1261
Konstantin Lotov V.
Konstantin Lotov, Alexander Sosedkin, Alexey Petrenko
Long-term evolution of broken wakefields in finite radius plasmas
5 pages, 6 figures
null
10.1103/PhysRevLett.112.194801
null
physics.plasm-ph physics.acc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A novel effect of fast heating and charging a finite-radius plasma is discovered in the context of plasma wakefield acceleration. As the plasma wave breaks, the most of its energy is transferred to plasma electrons which create strong charge-separation electric field and azimuthal magnetic field around the plasma. The slowly varying field structure is preserved for hundreds of wakefield periods and contains (together with hot electrons) up to 80% of the initial wakefield energy.
[ { "created": "Thu, 6 Feb 2014 06:34:28 GMT", "version": "v1" } ]
2015-06-18
[ [ "Lotov", "Konstantin", "" ], [ "Sosedkin", "Alexander", "" ], [ "Petrenko", "Alexey", "" ] ]
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1402.1263
Eli A. Meirom
Eli A. Meirom, Chris Milling, Constantine Caramanis, Shie Mannor, Ariel Orda, Sanjay Shakkottai
Localized epidemic detection in networks with overwhelming noise
null
null
null
null
cs.SI cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider the problem of detecting an epidemic in a population where individual diagnoses are extremely noisy. The motivation for this problem is the plethora of examples (influenza strains in humans, or computer viruses in smartphones, etc.) where reliable diagnoses are scarce, but noisy data plentiful. In flu/phone-viruses, exceedingly few infected people/phones are professionally diagnosed (only a small fraction go to a doctor) but less reliable secondary signatures (e.g., people staying home, or greater-than-typical upload activity) are more readily available. These secondary data are often plagued by unreliability: many people with the flu do not stay home, and many people that stay home do not have the flu. This paper identifies the precise regime where knowledge of the contact network enables finding the needle in the haystack: we provide a distributed, efficient and robust algorithm that can correctly identify the existence of a spreading epidemic from highly unreliable local data. Our algorithm requires only local-neighbor knowledge of this graph, and in a broad array of settings that we describe, succeeds even when false negatives and false positives make up an overwhelming fraction of the data available. Our results show it succeeds in the presence of partial information about the contact network, and also when there is not a single "patient zero", but rather many (hundreds, in our examples) of initial patient-zeroes, spread across the graph.
[ { "created": "Thu, 6 Feb 2014 07:16:16 GMT", "version": "v1" } ]
2014-02-07
[ [ "Meirom", "Eli A.", "" ], [ "Milling", "Chris", "" ], [ "Caramanis", "Constantine", "" ], [ "Mannor", "Shie", "" ], [ "Orda", "Ariel", "" ], [ "Shakkottai", "Sanjay", "" ] ]
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1402.1264
Sourav Roy
Sourav Roy, Narendra Nath Dutta and Sonjoy Majumder
Relativistic coupled cluster calculations on hyperfine structures and electromagnetic transition amplitudes of In III
11 pages, 4 figures
null
10.1103/PhysRevA.89.042511
null
physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Hyperfine constants and anomalies of ground as well as few low lying excited states of $^{113,115,117}$In III are studied with highly correlated relativistic coupled-cluster theory. The ground state hyperfine splitting of $^{115}$In III is estimated to be 106.8 GHz. A shift of almost 1.9 GHz of the above frequency has been calculated due to modified nuclear dipole moment. This splitting result shows its applicability as communication band and frequency standards at $10^{-11}$ sec. Correlations study of hyperfine constants indicates a few distinct features of many-body effects in the wave-functions in and near the nuclear region of this ion. Astrophysically important forbidden transition amplitudes are estimated for the first time in the literature to our knowledge. The calculated oscillator strengths of few allowed transitions are compared with recent experimental and theoretical results wherever available.
[ { "created": "Thu, 6 Feb 2014 07:17:14 GMT", "version": "v1" } ]
2015-06-18
[ [ "Roy", "Sourav", "" ], [ "Dutta", "Narendra Nath", "" ], [ "Majumder", "Sonjoy", "" ] ]
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1402.1268
Yoshihiko Hasegawa
Yoshihiko Hasegawa and Masanori Arita
Optimal implementations for reliable circadian clocks
5 pages, 4 figures; 6 pages of supplemental material with 2 figures
Physical Review Letters, 113, 108101 (2014)
10.1103/PhysRevLett.113.108101
null
physics.bio-ph q-bio.MN
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Circadian rhythms are acquired through evolution to increase the chances for survival through synchronizing with the daylight cycle. Reliable synchronization is realized through two trade-off properties: regularity to keep time precisely, and entrainability to synchronize the internal time with daylight. We found by using a phase model with multiple inputs that achieving the maximal limit of regularity and entrainability entails many inherent features of the circadian mechanism. At the molecular level, we demonstrate the role sharing of two light inputs, phase advance and delay, as is well observed in mammals. At the behavioral level, the optimal phase-response curve inevitably contains a dead zone, a time during which light pulses neither advance nor delay the clock. We reproduce the results of phase-controlling experiments entrained by two types of periodic light pulses. Our results indicate that circadian clocks are designed optimally for reliable clockwork through evolution.
[ { "created": "Thu, 6 Feb 2014 08:15:25 GMT", "version": "v1" }, { "created": "Sun, 17 Aug 2014 15:38:26 GMT", "version": "v2" } ]
2014-10-02
[ [ "Hasegawa", "Yoshihiko", "" ], [ "Arita", "Masanori", "" ] ]
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1402.1270
Abderrahim Mohammed El Amine
Abderrahim Mohammed El Amine
Vers une interface pour l enrichissement des requetes en arabe dans un systeme de recherche d information
9 pages, in French
CIIA'2009 : 2eme Conference Internationale sur Informatique et ses Applications, Saida - Algerie, 03 -04 Mai 2009
null
null
cs.IR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This presentation focuses on the automatic expansion of Arabic request using morphological analyzer and Arabic Wordnet. The expanded request is sent to Google.
[ { "created": "Thu, 6 Feb 2014 08:29:19 GMT", "version": "v1" } ]
2014-02-07
[ [ "Amine", "Abderrahim Mohammed El", "" ] ]
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1402.1274
George Tsibidis
George D. Tsibidis
Thermal response of double-layered metal films after ultrashort pulsed laser irradiation: the role of nonthermal electron dynamics
null
Applied Physics Letters 104, 051603 (2014)
10.1063/1.4863959
null
cond-mat.mtrl-sci cond-mat.mes-hall physics.comp-ph physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The thermal response of a Cu-Ti double-layered film is investigated after laser irradiation with ultrashort pulses (pulse duration {\tau}p=50fs, 800nm laser wavelength) in submelting conditions by including the influence of nonthermal electrons. A revised two-temperature model is employed to account for the contribution of nonthermal electron distribution while the variation of the optical properties of the material during the laser beam irradiation is also incorporated into the model. Theoretical results can provide significant insight into the physical mechanism that characterize electron dynamics and can facilitate production of controllable ultra-high strength Cu-Ti alloys with promising applications.
[ { "created": "Thu, 6 Feb 2014 08:51:07 GMT", "version": "v1" } ]
2014-02-07
[ [ "Tsibidis", "George D.", "" ] ]
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1402.1279
Qing Ai
Yao Shen, Hsin-Yu Ko, Qing Ai, Shie-Ming Peng, and Bih-Yaw Jin
Molecular Split-Ring Resonators Based on Metal String Complexes
8 pages, 8 figures
J. Phys. Chem. C 118, 3766 (2014)
10.1021/jp410619d
null
physics.optics cond-mat.mes-hall cond-mat.mtrl-sci quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Metal string complexes or extended metal atom chains (EMACs) belong to a family of molecules that consist of a linear chain of directly bonded metal atoms embraced helically by four multidentate organic ligands. These four organic ligands are usually made up of repeating pyridyl units, single-nitrogen-substituted heterocyclic annulenes, bridged by independent amido groups. Here, in this paper, we show that these heterocyclic annulenes are actually nanoscale molecular split-ring resonators (SRRs) that can exhibit simultaneous negative electric permittivity and magnetic permeability in the UV-Vis region. Moreover, a monolayer of self-assembled EMACs is a periodic array of molecular SRRs which can be considered as a negative refractive index material. In the molecular scale, where the quantum-size effect is significant, we apply the tight-binding method to obtain the frequency-dependent permittivity and permeability of these molecular SRRs with their tensorial properties carefully considered.
[ { "created": "Thu, 6 Feb 2014 09:00:10 GMT", "version": "v1" } ]
2014-02-24
[ [ "Shen", "Yao", "" ], [ "Ko", "Hsin-Yu", "" ], [ "Ai", "Qing", "" ], [ "Peng", "Shie-Ming", "" ], [ "Jin", "Bih-Yaw", "" ] ]
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1402.1283
Nizar Rokbani
Abdallah Zaidi, Nizar Rokbani, and Adel. M. Alimi
A Hierarchical fuzzy controller for a biped robot
4 pages- 9 figures. Proc of The 2013 International Conference on Individual and Collective Behaviors in Robotics (ICBR 2013)
null
null
null
cs.RO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper the investigation is placed on the hierarchic neuro-fuzzy systems as a possible solution for biped control. An hierarchic controller for biped is presented, it includes several sub-controllers and the whole structure is generated using the adaptive Neuro-fuzzy method. The proposed hierarchic system focus on the key role that the centre of mass position plays in biped robotics, the system sub-controllers generate their outputs taken into consideration the position of that key point.
[ { "created": "Thu, 6 Feb 2014 09:09:56 GMT", "version": "v1" } ]
2014-02-07
[ [ "Zaidi", "Abdallah", "" ], [ "Rokbani", "Nizar", "" ], [ "Alimi", "Adel. M.", "" ] ]
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1402.1285
Jorge Gonz\'alez-Dom\'inguez
Jorge Gonz\'alez-Dom\'inguez, Evangelos Georganas, Yili Zheng, Mar\'ia J. Mart\'in
Constructing Performance Models for Dense Linear Algebra Algorithms on Cray XE Systems
null
null
null
null
cs.DC cs.MS cs.PF
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Hiding or minimizing the communication cost is key in order to obtain good performance on large-scale systems. While communication overlapping attempts to hide communications cost, 2.5D communication avoiding algorithms improve performance scalability by reducing the volume of data transfers at the cost of extra memory usage. Both approaches can be used together or separately and the best choice depends on the machine, the algorithm and the problem size. Thus, the development of performance models is crucial to determine the best option for each scenario. In this paper, we present a methodology for constructing performance models for parallel numerical routines on Cray XE systems. Our models use portable benchmarks that measure computational cost and network characteristics, as well as performance degradation caused by simultaneous accesses to the network. We validate our methodology by constructing the performance models for the 2D and 2.5D approaches, with and without overlapping, of two matrix multiplication algorithms (Cannon's and SUMMA), triangular solve (TRSM) and Cholesky. We compare the estimations provided by these models with the experimental results using up to 24,576 cores of a Cray XE6 system and predict the performance of the algorithms on larger systems. Results prove that the estimations significantly improve when taking into account network contention.
[ { "created": "Thu, 6 Feb 2014 09:16:38 GMT", "version": "v1" } ]
2014-02-07
[ [ "González-Domínguez", "Jorge", "" ], [ "Georganas", "Evangelos", "" ], [ "Zheng", "Yili", "" ], [ "Martín", "María J.", "" ] ]
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1402.1287
Brijender Kahanwal Dr.
Brijender Kahanwal
Towards High Performance Computing (Hpc) Through Parallel Programming Paradigms and Their Principles
11 pages, 2 figures. International Journal of Programming Languages and Applications (IJPLA) 2014
null
10.5121/ijpla.2014.4104
null
cs.PL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Nowadays, we are to find out solutions to huge computing problems very rapidly. It brings the idea of parallel computing in which several machines or processors work cooperatively for computational tasks. In the past decades, there are a lot of variations in perceiving the importance of parallelism in computing machines. And it is observed that the parallel computing is a superior solution to many of the computing limitations like speed and density; non-recurring and high cost; and power consumption and heat dissipation etc. The commercial multiprocessors have emerged with lower prices than the mainframe machines and supercomputers machines. In this article the high performance computing (HPC) through parallel programming paradigms (PPPs) are discussed with their constructs and design approaches.
[ { "created": "Thu, 6 Feb 2014 09:34:01 GMT", "version": "v1" } ]
2014-02-07
[ [ "Kahanwal", "Brijender", "" ] ]
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1402.1296
Tiago Guerreiro
Ricardo Jo\~ao Silveira Santos Gamboa
Mnemonical Body Shortcuts: Gestural Interface for Mobile Devices
124 pages, MSc Thesis, Technical University of Lisbon
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null
null
cs.HC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Mobile devices' user interfaces are still quite similar to traditional interfaces offered by desktop computers, but those can be highly problematic when used in a mobile context. Human gesture recognition in mobile interaction appears as an important area to provide suitable on-the-move usability. We present a body space based approach to improve mobile device interaction and mobile performance, which we named as Mnemonical Body Shortcuts. The human body is presented as a rich repository of meaningful relations which are always available to interact with. These body-based gestures allow the user to naturally interact with mobile devices with no movement limitations. Preliminary studies using Radio Frequency Identification (RFID) technology were performed, validating Mnemonical Body Shortcuts as an appropriate new mobile interaction mechanism. Following those studies, we developed inertial sensing prototypes using an accelerometer, ending in the construction and user testing of a gestural interface for mobile devices capable of properly recognizing Mnemonical Body Shortcuts and also providing suitable user control mechanisms and audio, visual and haptic feedback.
[ { "created": "Thu, 6 Feb 2014 09:54:25 GMT", "version": "v1" } ]
2014-02-07
[ [ "Gamboa", "Ricardo João Silveira Santos", "" ] ]
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1402.1298
Lenka Zdeborova
Yoshiyuki Kabashima, Florent Krzakala, Marc M\'ezard, Ayaka Sakata, and Lenka Zdeborov\'a
Phase transitions and sample complexity in Bayes-optimal matrix factorization
50 pages, 10 figures
IEEE Transactions on Information Theory (Volume:62 , Issue: 7, Pages: 4228 - 4265) 2016
10.1109/TIT.2016.2556702
null
cs.NA cond-mat.stat-mech cs.IT cs.LG math.IT stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We analyse the matrix factorization problem. Given a noisy measurement of a product of two matrices, the problem is to estimate back the original matrices. It arises in many applications such as dictionary learning, blind matrix calibration, sparse principal component analysis, blind source separation, low rank matrix completion, robust principal component analysis or factor analysis. It is also important in machine learning: unsupervised representation learning can often be studied through matrix factorization. We use the tools of statistical mechanics - the cavity and replica methods - to analyze the achievability and computational tractability of the inference problems in the setting of Bayes-optimal inference, which amounts to assuming that the two matrices have random independent elements generated from some known distribution, and this information is available to the inference algorithm. In this setting, we compute the minimal mean-squared-error achievable in principle in any computational time, and the error that can be achieved by an efficient approximate message passing algorithm. The computation is based on the asymptotic state-evolution analysis of the algorithm. The performance that our analysis predicts, both in terms of the achieved mean-squared-error, and in terms of sample complexity, is extremely promising and motivating for a further development of the algorithm.
[ { "created": "Thu, 6 Feb 2014 09:56:50 GMT", "version": "v1" }, { "created": "Sat, 31 Jan 2015 20:56:04 GMT", "version": "v2" }, { "created": "Mon, 21 Mar 2016 18:07:08 GMT", "version": "v3" } ]
2016-07-19
[ [ "Kabashima", "Yoshiyuki", "" ], [ "Krzakala", "Florent", "" ], [ "Mézard", "Marc", "" ], [ "Sakata", "Ayaka", "" ], [ "Zdeborová", "Lenka", "" ] ]
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1402.1307
Anne Amy-Klein
Anthony Bercy (LPL, SYRTE), Sa\"ida Guellati-Kh\'elifa (LKB - Jussieu), Fabio Stefani (LPL, SYRTE), Giorgio Santarelli (LP2N), Christian Chardonnet (LPL), Paul-Eric Pottie (SYRTE), Olivier Lopez (LPL), Anne Amy-Klein (LPL)
In-line extraction of an ultra-stable frequency signal over an optical fiber link
null
null
10.1364/JOSAB.31.000678
null
physics.optics quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We demonstrate in-line extraction of an ultra-stable frequency signal over an optical link of 92-km of installed telecommunication fibers, following the proposition of G. Grosche in 2010. We show that the residual frequency noise at the extraction end is noticeably below that at the main link output when the extraction is near the input end, as expected from a simple model of the noise compensation. We obtain relative frequency instabilities, expressed as overlapping Allan deviation, of 8x10-16 at 1 s averaging time and a few 10-19 at 1 day. These results are at the state-of-the-art for a link using urban telecommunication fibers. We also propose an improved scheme which delivers an ultra-stable signal of higher power, in order to feed a secondary link. In-line extraction opens the way to a broad distribution of an ultra-stable frequency reference, enabling a wide range of applications beyond metrology.
[ { "created": "Thu, 6 Feb 2014 10:34:40 GMT", "version": "v1" } ]
2015-06-18
[ [ "Bercy", "Anthony", "", "LPL, SYRTE" ], [ "Guellati-Khélifa", "Saïda", "", "LKB -\n Jussieu" ], [ "Stefani", "Fabio", "", "LPL, SYRTE" ], [ "Santarelli", "Giorgio", "", "LP2N" ], [ "Chardonnet", "Christian", "", "LPL" ], [ "Pottie", "Paul-Eric", "", "SYRTE" ], [ "Lopez", "Olivier", "", "LPL" ], [ "Amy-Klein", "Anne", "", "LPL" ] ]
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1402.1309
Yanik Ngoko
Yanik Ngoko, Christophe C\'erin, Alfredo Goldman, and Dejan Milojicic
Backtracking algorithms for service selection
31 pages
null
null
null
cs.DC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we explore the automation of services' compositions. We focus on the service selection problem. In the formulation that we consider, the problem's inputs are constituted by a behavioral composition whose abstract services must be bound to concrete ones. The objective is to find the binding that optimizes the {\it utility} of the composition under some services level agreements. We propose a complete solution. Firstly, we show that the service selection problem can be mapped onto a Constraint Satisfaction Problem (CSP). The benefit of this mapping is that the large know-how in the resolution of the CSP can be used for the service selection problem. Among the existing techniques for solving CSP, we consider the backtracking. Our second contribution is to propose various backtracking-based algorithms for the service selection problem. The proposed variants are inspired by existing heuristics for the CSP. We analyze the runtime gain of our framework over an intuitive resolution based on exhaustive search. Our last contribution is an experimental evaluation in which we demonstrate that there is an effective gain in using backtracking instead of some comparable approaches. The experiments also show that our proposal can be used for finding in real time, optimal solutions on small and medium services' compositions.
[ { "created": "Thu, 6 Feb 2014 10:38:26 GMT", "version": "v1" } ]
2014-02-07
[ [ "Ngoko", "Yanik", "" ], [ "Cérin", "Christophe", "" ], [ "Goldman", "Alfredo", "" ], [ "Milojicic", "Dejan", "" ] ]
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1402.1310
Yair Censor
R. Davidi, Y. Censor, R.W. Schulte, S. Geneser, and L. Xing
Feasibility-Seeking and Superiorization Algorithms Applied to Inverse Treatment Planning in Radiation Therapy
Contemporary Mathematics, accepted for publication
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null
null
math.OC physics.med-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We apply the recently proposed superiorization methodology (SM) to the inverse planning problem in radiation therapy. The inverse planning problem is represented here as a constrained minimization problem of the total variation (TV) of the intensity vector over a large system of linear two-sided inequalities. The SM can be viewed conceptually as lying between feasibility-seeking for the constraints and full-fledged constrained minimization of the objective function subject to these constraints. It is based on the discovery that many feasibility-seeking algorithms (of the projection methods variety) are perturbation-resilient, and can be proactively steered toward a feasible solution of the constraints with a reduced, thus superiorized, but not necessarily minimal, objective function value.
[ { "created": "Thu, 6 Feb 2014 10:42:42 GMT", "version": "v1" } ]
2014-02-07
[ [ "Davidi", "R.", "" ], [ "Censor", "Y.", "" ], [ "Schulte", "R. W.", "" ], [ "Geneser", "S.", "" ], [ "Xing", "L.", "" ] ]
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1402.1314
Arul Lawrence Selvakumar
A.Arul Lawernce Selvakumar, R.S.Ratastogi (Member IAENG)
Study the function of building blocks in SHA Family
null
null
null
null
cs.CR
http://creativecommons.org/licenses/by/3.0/
In this paper we analyse the role of some of the building blocks in SHA-256. We show that the disturbance correction strategy is applicable to the SHA-256 architecture and we prove that functions $\Sigma$, $\sigma$ are vital for the security of SHA-256 by showing that for a variant without them it is possible to find collisions with complexity 2 64 hash operations. As a step towards an analysis of the full function, we present the results of our experiments on Hamming weights of expanded messages for different variants of the message expansion and show that there exist low-weight expanded messages for XOR-linearised variants.
[ { "created": "Thu, 6 Feb 2014 10:55:21 GMT", "version": "v1" } ]
2014-02-07
[ [ "Selvakumar", "A. Arul Lawernce", "", "Member IAENG" ], [ "Ratastogi", "R. S.", "", "Member IAENG" ] ]
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1402.1319
Edward Barnes
Enno K\"atelh\"on, Edward O. Barnes, Kay J. Krause, Bernhard Wolfrum, Richard G. Compton
Equality of diffusion-limited chronoamperometric currents to equal area spherical and cubic nanoparticles on a supporting electrode surface
null
null
10.1016/j.cplett.2014.01.036
null
physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We computationally investigate the chronoamperometric current response of spherical and cubic particles on a supporting insulating surface. By using the method of finite differences and random walk simulations, we can show that both systems exhibit identical responses on all time scales if their exposed surface areas are equal. This result enables a simple and computationally effcient method to treat certain spherical geometries in random walk based noise investigations.
[ { "created": "Thu, 6 Feb 2014 11:24:28 GMT", "version": "v1" }, { "created": "Fri, 7 Feb 2014 09:59:24 GMT", "version": "v2" } ]
2016-11-25
[ [ "Kätelhön", "Enno", "" ], [ "Barnes", "Edward O.", "" ], [ "Krause", "Kay J.", "" ], [ "Wolfrum", "Bernhard", "" ], [ "Compton", "Richard G.", "" ] ]
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1402.1321
Artur Ishkhanyan
T.A. Shahverdyan, D.S. Mogilevtsev, V.M. Red'kov, and A.M. Ishkhanyan
Complete-return spectrum for a generalized Rosen-Zener two-state term-crossing model
null
Nonlinear phenomena in complex systems 16(1), 86 (2013)
null
null
physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The general semiclassical time-dependent two-state problem is considered for a specific field configuration referred to as the generalized Rosen-Zener model. This is a rich family of pulse amplitude- and phase-modulation functions describing both non-crossing and term-crossing models with one or two crossing points. The model includes the original constant-detuning non-crossing Rosen-Zener model as a particular case. We show that the governing system of equations is reduced to a confluent Heun equation. When inspecting the conditions for returning the system to the initial state at the end of the interaction with the field, we reformulate the problem as an eigenvalue problem for the peak Rabi frequency and apply the Rayleigh-Schr\"odinger perturbation theory. Further, we develop a generalized approach for finding the higher-order approximations, which is applicable for the whole variation region of the involved input parameters of the system. We examine the general surface in the 3D space of input parameters, which defines the position of the n-th order return-resonance, and show that the section of the general surface is accurately approximated by an ellipse. We find a highly accurate analytic description through the zeros of a Kummer confluent hypergeometric function. From the point of view of the generality, the analytical description of mentioned curve for the whole variation range of all involved parameters is the main result of the present paper.
[ { "created": "Thu, 6 Feb 2014 11:27:26 GMT", "version": "v1" } ]
2014-02-07
[ [ "Shahverdyan", "T. A.", "" ], [ "Mogilevtsev", "D. S.", "" ], [ "Red'kov", "V. M.", "" ], [ "Ishkhanyan", "A. M.", "" ] ]
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1402.1324
Tiago Guerreiro
Ivo Rafael
UCAT: Ubiquitous Context Awareness Tools for The Blind
93 pages, MSc Thesis, University of Lisbon
null
null
null
cs.HC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Visually impaired people are often confronted with new environments and they find themselves face to face with an innumerous amount of difficulties when facing these environments. Having to surpass and deal with these difficulties that arise with their condition is something that we can help diminish. They are one sense down when trying to understand their surrounding environments and gather information about what is happening around them. Nowadays, mobile devices present significant computing and technological capacity which has been increasing to the point where it is very common for most people to have access to a device with Bluetooth, GPS, Wi-Fi, and both high processing and storage capacities. This allows us to think of applications that can do so much to help people with difficulties. In the particular case of blind people, the lack of visual information can be bypassed with other contextual information retrieved by their own personal devices. Our goal is to provide information to blind users, be able to give them information about the context that surrounds them. We wanted to provide the blind users with the tools to create information and be able to share this information between each other, information about people, locations or objects. Our approach was to split the project into a data and information gathering phase where we did our field search and interviewed and elaborated on how is the situation of environment perception for blind users, followed by a technical phase where we implement a system based on the first stage. Our results gathered from both the collecting phase and our implementing phase showed that there is potential to use these tools in the blind community and that they welcome the possibilities and horizons that it opens them.
[ { "created": "Thu, 6 Feb 2014 11:35:07 GMT", "version": "v1" } ]
2014-02-07
[ [ "Rafael", "Ivo", "" ] ]
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1402.1326
Artur Ishkhanyan
A.M. Ishkhanyan and A.E. Grigoryan
Fifteen classes of solutions of the quantum two-state problem in terms of the confluent Heun function
null
J. Phys. A 47, 465205 (2014)
10.1088/1751-8113/47/46/465205
null
physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We derive 15 classes of time-dependent two-state models solvable in terms of the confluent Heun functions. These classes extend over all the known families of three- and two-parametric models solvable in terms of the hypergeometric and the confluent hypergeometric functions to more general four-parametric classes involving three-parametric detuning modulation functions. In the case of constant detuning the field configurations describe excitations of two-state quantum systems by symmetric or asymmetric pulses of controllable width and edge-steepness. The classes that provide constant detuning pulses of finite area are identified and the factors controlling the corresponding pulse shapes are discussed. The positions and the heights of the peaks are mostly defined by two of the three parameters of the detuning modulation function, while the pulse width is mainly controlled by the third one, the constant term. The classes suggest numerous symmetric and asymmetric chirped pulses and a variety of models with two crossings of the frequency resonance. We discuss the excitation of a two-level atom by a pulse of Lorentzian shape with a detuning providing one or two crossings of the resonance. We derive closed form solutions for particular curves in the 3D space of the involved parameters which compose the complete return spectrum of the considered two-state quantum system.
[ { "created": "Thu, 6 Feb 2014 11:37:18 GMT", "version": "v1" }, { "created": "Tue, 11 Mar 2014 01:35:51 GMT", "version": "v2" }, { "created": "Sun, 9 Nov 2014 20:20:31 GMT", "version": "v3" } ]
2014-11-11
[ [ "Ishkhanyan", "A. M.", "" ], [ "Grigoryan", "A. E.", "" ] ]
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1402.1327
Rushirajsinh Zala
Mr.Rushirajsinh L. Zala, Mr.Brijesh B. Mehta, Mr.Mahipalsinh R. Zala
A Survey on Spatial Co-location Patterns Discovery from Spatial Datasets
6 pages,8 figures
IJCTT 7(3):137-142, January 2014
10.14445/22312803/IJCTT-V7P140
null
cs.DB
http://creativecommons.org/licenses/by/3.0/
Spatial data mining or Knowledge discovery in spatial database is the extraction of implicit knowledge, spatial relations and spatial patterns that are not explicitly stored in databases. Co-location patterns discovery is the process of finding the subsets of features that are frequently located together in the same geographic area. In this paper, we discuss the different approaches like Rule based approach, Join-less approach, Partial Join approach and Constraint neighborhood based approach for finding co-location patterns.
[ { "created": "Thu, 6 Feb 2014 11:37:45 GMT", "version": "v1" } ]
2014-02-07
[ [ "Zala", "Mr. Rushirajsinh L.", "" ], [ "Mehta", "Mr. Brijesh B.", "" ], [ "Zala", "Mr. Mahipalsinh R.", "" ] ]
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1402.1330
Artur Ishkhanyan
A.M. Ishkhanyan and A.E. Grigoryan
Time-dependent level crossing models solvable in terms of the confluent Heun functions
arxiv admin note: substantial text overlap with arXiv:1402.1326
null
null
null
physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We discuss the level-crossing field configurations for which the quantum time-dependent two-state problem is solvable in terms of the confluent Heun functions. We show that these configurations belong to fifteen four-parametric families of models that generalize all the known 3- and 2-parametric families for which the problem is solvable in terms of the Gauss hypergeometric and the Kummer confluent hypergeometric functions. Analyzing the general case of variable Rabi frequency and frequency detuning we mention that the most notable features of the models provided by the derived classes are due to the extra constant term in the detuning modulation function. Due to this term the classes suggest numerous symmetric or asymmetric chirped pulses and a variety of models with two crossings of the frequency resonance. The latter models are generated by both real and complex transformations of the independent variable. In general, the resulting detuning functions are asymmetric, the asymmetry being controlled by the parameters of the detuning modulation function. In some cases, however, the asymmetry may be additionally caused by the amplitude modulation function. We present an example of the latter possibility and additionally mention a constant amplitude model with periodically repeated resonance-crossings. Finally, we discuss the excitation of a two-level atom by a pulse of Lorentzian shape with a detuning providing one or two crossings of the resonance. Using a series expansion of the solution of the confluent Heun equation in terms of the Kummer hypergeometric functions we derive particular closed form solutions of the two-state problem for this field configuration. The particular sets of the involved parameters for which these solutions are obtained define curves in the 3D space of the involved parameters belonging to the complete return spectrum of the considered two-state quantum system.
[ { "created": "Thu, 6 Feb 2014 11:44:45 GMT", "version": "v1" }, { "created": "Mon, 10 Feb 2014 10:42:46 GMT", "version": "v2" } ]
2014-11-11
[ [ "Ishkhanyan", "A. M.", "" ], [ "Grigoryan", "A. E.", "" ] ]
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1402.1331
Abhishek Bhattacharya
Abhishek Bhattacharya, Tanusree Chatterjee
An Estimation Method of Measuring Image Quality for Compressed Images of Human Face
6 pages
null
10.14445/22312803/IJCTT-V7P144
null
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Nowadays digital image compression and decompression techniques are very much important. So our aim is to calculate the quality of face and other regions of the compressed image with respect to the original image. Image segmentation is typically used to locate objects and boundaries (lines, curves etc.)in images. After segmentation the image is changed into something which is more meaningful to analyze. Using Universal Image Quality Index(Q),Structural Similarity Index(SSIM) and Gradient-based Structural Similarity Index(G-SSIM) it can be shown that face region is less compressed than any other region of the image.
[ { "created": "Thu, 6 Feb 2014 11:58:42 GMT", "version": "v1" } ]
2014-02-07
[ [ "Bhattacharya", "Abhishek", "" ], [ "Chatterjee", "Tanusree", "" ] ]
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1402.1338
Gail Higginbottom
Gail Higginbottom and Roger Clay
Origins of Megalithic Astronomy in Britain
23 pages, 12 Figures, 1 Table
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null
null
physics.hist-ph physics.pop-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
By c. 3000 BC, in the late Neolithic, there had been a significant change in the way people materialized their cosmology across Scotland with the introduction of free-standing stones. These were erected almost until the end of the Bronze Age (Burl 2000, 1993). Significantly, a series of astronomical patternings have been empirically verified for many Bronze Age monuments that were erected between 1400-900 BC (Higginbottom et 14 al. 2013, 2003, 2001, 2000). Further, two series of complex landscape patternings associated with the same monuments and their orientations have been identified (Higginbottom et al. 2013 & Higginbottom 'in preparation' - Bronze Age megalithic monuments on the isle of Mull). However, when and where these patterns were first associated with standing-stone structures was unknown. Through innovative statistics and software we show that visible astronomical-landscape variables found at Bronze Age sites on the inner isles and mainland of western Scotland were actually first established nearly two millennia earlier, with the erection of the first 'great circles' in Britain: Callanish on the Isle of Lewis and Stenness on the Isle of Orkney. In particular, we introduce our new statistical test that enables the quantitative determination of astronomical connections of stone circles. It is seen that, whilst different standing-stone monuments were created over time (Burl 2000, 1993; 22 Higginbottom et al. 2013; Sheridan & Brophy 2012) with a mixture of landscape variables (Higginbottom et al. 2013), there are nevertheless highly relevant aspects that remained unchanged through these years. This suggests that there is some continuity of this cosmological system through time, despite the various radical material and social changes that occurred from the late Neolithic to the Late Bronze Age (Lynch 2000; Mullin 26 2001; Owoc 2001).
[ { "created": "Thu, 6 Feb 2014 12:39:11 GMT", "version": "v1" }, { "created": "Tue, 7 Apr 2015 03:52:32 GMT", "version": "v2" } ]
2015-04-08
[ [ "Higginbottom", "Gail", "" ], [ "Clay", "Roger", "" ] ]
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1402.1347
Praboo N N
N.N. Praboo and P.K. Bhaba
Simulation work on Fractional Order PI{\lambda} Control Strategy for speed control of DC motor based on stability boundary locus method
7 pages, 13 figures, Published with International Journal of Engineering Trends and Technology (IJETT)
IJETT, 4(8):3403-309, August 2013
null
null
cs.SY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper deals with the design of Fractional Order Proportional Integral (FO-PI{\lambda}) controller for the speed control of DC motor. A mathematical model of DC motor control system is derived and based on this model fractional order PI{\lambda} controller is designed using stability boundary locus method to satisfy required gain margin (GM) and phase margin (PM) of the system. Servo and Regulatory tracking simulation runs are carried out for the speed control of DC motor. The performance of the fractional order PI{\lambda} (FO-PI{\lambda}) controller is compared with Integer Order Relay Feedback Proportional Integral (IO-RFPI) controller. Finally the stability of both control system is considered.
[ { "created": "Thu, 6 Feb 2014 13:27:01 GMT", "version": "v1" } ]
2014-02-07
[ [ "Praboo", "N. N.", "" ], [ "Bhaba", "P. K.", "" ] ]
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1402.1348
Deepak Nayak Ranjan
Deepak Ranjan Nayak, Sumit Kumar Sahu and Jahangir Mohammed
A Cellular Automata based Optimal Edge Detection Technique using Twenty-Five Neighborhood Model
7 pages, 9 figures
International Journal of Computer Applications, Volume 84, Number 10, Year of Publication: 2013
10.5120/14614-2869
null
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Cellular Automata (CA) are common and most simple models of parallel computations. Edge detection is one of the crucial task in image processing, especially in processing biological and medical images. CA can be successfully applied in image processing. This paper presents a new method for edge detection of binary images based on two dimensional twenty five neighborhood cellular automata. The method considers only linear rules of CA for extraction of edges under null boundary condition. The performance of this approach is compared with some existing edge detection techniques. This comparison shows that the proposed method to be very promising for edge detection of binary images. All the algorithms and results used in this paper are prepared in MATLAB.
[ { "created": "Thu, 6 Feb 2014 13:32:39 GMT", "version": "v1" } ]
2014-02-07
[ [ "Nayak", "Deepak Ranjan", "" ], [ "Sahu", "Sumit Kumar", "" ], [ "Mohammed", "Jahangir", "" ] ]
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1402.1349
Veronika Cheplygina
Veronika Cheplygina, David M. J. Tax, Marco Loog
Dissimilarity-based Ensembles for Multiple Instance Learning
Submitted to IEEE Transactions on Neural Networks and Learning Systems, Special Issue on Learning in Non-(geo)metric Spaces
IEEE Transactions on Neural Networks and Learning Systems, Volume 27, Issue 6, 2016, pages 1379 - 1391
10.1109/TNNLS.2015.2424254
null
stat.ML cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In multiple instance learning, objects are sets (bags) of feature vectors (instances) rather than individual feature vectors. In this paper we address the problem of how these bags can best be represented. Two standard approaches are to use (dis)similarities between bags and prototype bags, or between bags and prototype instances. The first approach results in a relatively low-dimensional representation determined by the number of training bags, while the second approach results in a relatively high-dimensional representation, determined by the total number of instances in the training set. In this paper a third, intermediate approach is proposed, which links the two approaches and combines their strengths. Our classifier is inspired by a random subspace ensemble, and considers subspaces of the dissimilarity space, defined by subsets of instances, as prototypes. We provide guidelines for using such an ensemble, and show state-of-the-art performances on a range of multiple instance learning problems.
[ { "created": "Thu, 6 Feb 2014 13:35:01 GMT", "version": "v1" } ]
2016-07-12
[ [ "Cheplygina", "Veronika", "" ], [ "Tax", "David M. J.", "" ], [ "Loog", "Marco", "" ] ]
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1402.1356
Ya Cheng Professor
Jiangxin Song, Jintian Lin, Jialei Tang, Lingling Qiao, Ya Cheng
Integration of an optical fiber taper with an optical microresonator fabricated in glass by femtosecond laser 3D micromachining
13 pages, 4 figures
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physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We report on fabrication of a microtoroid resonator of a high-quality factor (i. e., Q-factor of ~3.24x10^6 measured under the critical coupling condition) using femtosecond laser three-dimensional (3D) micromachining. Coupling of light into and out of the microresonator has been realized with a fiber taper that is reliably assembled with the microtoroid. The assembly of the fiber taper to the microtoroid is achieved by welding the fiber taper onto the sidewall of the microtoroid using CO2 laser irradiation. The integrated microresonator maintains a high Q-factor of 3.21x10^5 as measured in air.
[ { "created": "Thu, 6 Feb 2014 14:02:35 GMT", "version": "v1" } ]
2014-02-07
[ [ "Song", "Jiangxin", "" ], [ "Lin", "Jintian", "" ], [ "Tang", "Jialei", "" ], [ "Qiao", "Lingling", "" ], [ "Cheng", "Ya", "" ] ]
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1402.1359
Kai Berger
Kai Berger and Jeyarajan Thiyagalingam
Real-time Pedestrian Surveillance with Top View Cumulative Grids
null
null
null
null
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This manuscript presents an efficient approach to map pedestrian surveillance footage to an aerial view for global assessment of features. The analysis of the footages relies on low level computer vision and enable real-time surveillance. While we neglect object tracking, we introduce cumulative grids on top view scene flow visualization to highlight situations of interest in the footage. Our approach is tested on multiview footage both from RGB cameras and, for the first time in the field, on RGB-D-sensors.
[ { "created": "Thu, 6 Feb 2014 14:09:25 GMT", "version": "v1" } ]
2014-02-07
[ [ "Berger", "Kai", "" ], [ "Thiyagalingam", "Jeyarajan", "" ] ]
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1402.1361
Jean-Guillaume Fages
Jean-Guillaume Fages, Gilles Chabert and Charles Prud'homme
Combining finite and continuous solvers
Presented at Workshop TRICS in conference CP'13
null
null
null
cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Combining efficiency with reliability within CP systems is one of the main concerns of CP developers. This paper presents a simple and efficient way to connect Choco and Ibex, two CP solvers respectively specialised on finite and continuous domains. This enables to take advantage of the most recent advances of the continuous community within Choco while saving development and maintenance resources, hence ensuring a better software quality.
[ { "created": "Thu, 6 Feb 2014 14:21:26 GMT", "version": "v1" } ]
2014-02-07
[ [ "Fages", "Jean-Guillaume", "" ], [ "Chabert", "Gilles", "" ], [ "Prud'homme", "Charles", "" ] ]
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1402.1362
Rosalind J Allen
Thomas W. Lion and Rosalind J. Allen
Osmosis with active solutes
6 pages
null
10.1209/0295-5075/106/34003
null
cond-mat.soft physics.comp-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Despite much current interest in active matter, little is known about osmosis in active systems. Using molecular dynamics simulations, we investigate how active solutes perturb osmotic steady states. We find that solute activity increases the osmotic pressure, and can also expel solvent from the solution - i.e. cause reverse osmosis. The latter effect cannot be described by an effective temperature, but can be reproduced by mapping the active solution onto a passive one with the same degree of local structuring as the passive solvent component. Our results provide a basic framework for understanding active osmosis, and suggest that activity-induced structuring of the passive component may play a key role in the physics of active-passive mixtures.
[ { "created": "Thu, 6 Feb 2014 14:23:33 GMT", "version": "v1" } ]
2015-06-18
[ [ "Lion", "Thomas W.", "" ], [ "Allen", "Rosalind J.", "" ] ]
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1402.1364
Jonas Rodewald
Philipp Haslinger, Nadine D\"orre, Philipp Geyer, Jonas Rodewald, Stefan Nimmrichter and Markus Arndt
A universal matter-wave interferometer with optical ionization gratings in the time domain
7 pages, 4 figures
Nature Physics 9, 144 148, 2013
10.1038/nphys2542
null
quant-ph physics.atm-clus physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Matter-wave interferometry with atoms and molecules has attracted a rapidly growing interest over the past two decades, both in demonstrations of fundamental quantum phenomena and in quantum-enhanced precision measurements. Such experiments exploit the non-classical superposition of two or more position and momentum states which are coherently split and rejoined to interfere. Here, we present the experimental realization of a universal near-field interferometer built from three short-pulse single-photon ionization gratings. We observe quantum interference of fast molecular clusters, with a composite de Broglie wavelength as small as 275 fm. Optical ionization gratings are largely independent of the specific internal level structure and are therefore universally applicable to different kinds of nanoparticles, ranging from atoms to clusters, molecules and nanospheres. The interferometer is sensitive to fringe shifts as small as a few nanometers and yet robust against velocity-dependent phase shifts, since the gratings exist only for nanoseconds and form an interferometer in the time domain.
[ { "created": "Thu, 6 Feb 2014 14:33:37 GMT", "version": "v1" } ]
2014-02-07
[ [ "Haslinger", "Philipp", "" ], [ "Dörre", "Nadine", "" ], [ "Geyer", "Philipp", "" ], [ "Rodewald", "Jonas", "" ], [ "Nimmrichter", "Stefan", "" ], [ "Arndt", "Markus", "" ] ]
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1402.1368
Laszlo Csirmaz
Laszlo Csirmaz and G\'abor Tardos
On-line secret sharing
null
Des. Codes Cryptopgr (2012) 63: 127-147
10.1007/s10623-011-9540-y
null
cs.IT cs.CR math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In an on-line secret sharing scheme the dealer assigns shares in the order the participants show up, knowing only those qualified subsets whose all members she has seen. We assume that the overall access structure is known and only the order of the participants is unknown. On-line secret sharing is a useful primitive when the set of participants grows in time, and redistributing the secret is too expensive. In this paper we start the investigation of unconditionally secure on-line secret sharing schemes. The complexity of a secret sharing scheme is the size of the largest share a single participant can receive over the size of the secret. The infimum of this amount in the on-line or off-line setting is the on-line or off-line complexity of the access structure, respectively. For paths on at most five vertices and cycles on at most six vertices the on-line and offline complexities are equal, while for other paths and cycles these values differ. We show that the gap between these values can be arbitrarily large even for graph based access structures. We present a general on-line secret sharing scheme that we call first-fit. Its complexity is the maximal degree of the access structure. We show, however, that this on-line scheme is never optimal: the on-line complexity is always strictly less than the maximal degree. On the other hand, we give examples where the first-fit scheme is almost optimal, namely, the on-line complexity can be arbitrarily close to the maximal degree. The performance ratio is the ratio of the on-line and off-line complexities of the same access structure. We show that for graphs the performance ratio is smaller than the number of vertices, and for an infinite family of graphs the performance ratio is at least constant times the square root of the number of vertices.
[ { "created": "Thu, 6 Feb 2014 14:46:11 GMT", "version": "v1" } ]
2014-02-07
[ [ "Csirmaz", "Laszlo", "" ], [ "Tardos", "Gábor", "" ] ]
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1402.1371
Veronika Cheplygina
David M. J. Tax, Veronika Cheplygina, Marco Loog
Quantile Representation for Indirect Immunofluorescence Image Classification
null
null
null
null
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In the diagnosis of autoimmune diseases, an important task is to classify images of slides containing several HEp-2 cells. All cells from one slide share the same label, and by classifying cells from one slide independently, some information on the global image quality and intensity is lost. Considering one whole slide as a collection (a bag) of feature vectors, however, poses the problem of how to handle this bag. A simple, and surprisingly effective, approach is to summarize the bag of feature vectors by a few quantile values per feature. This characterizes the full distribution of all instances, thereby assuming that all instances in a bag are informative. This representation is particularly useful when each bag contains many feature vectors, which is the case in the classification of the immunofluorescence images. Experiments on the classification of indirect immunofluorescence images show the usefulness of this approach.
[ { "created": "Thu, 6 Feb 2014 14:56:55 GMT", "version": "v1" } ]
2014-02-07
[ [ "Tax", "David M. J.", "" ], [ "Cheplygina", "Veronika", "" ], [ "Loog", "Marco", "" ] ]
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1402.1375
Przemyslaw Perlikowski
Piotr Koluda and Przemyslaw Perlikowski and Krzysztof Czolczynski and Tomasz Kapitaniak
Synchronization of two self-excited double pendula
null
null
10.1140/epjst/e2014-02129-7
null
physics.class-ph nlin.CD
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider the synchronization of two self-excited double pendula. We show that such pendula hanging on the same beam can have four different synchronous configurations. Our approximate analytical analysis allows us to derive the synchronization conditions and explain the observed types of synchronization. We consider an energy balance in the system and describe how the energy is transferred between the pendula via the oscillating beam, allowing thus the pendula synchronization. Changes and stability ranges of the obtained solutions with increasing and decreasing masses of the pendula are shown using path-following.
[ { "created": "Thu, 6 Feb 2014 15:09:18 GMT", "version": "v1" } ]
2015-06-18
[ [ "Koluda", "Piotr", "" ], [ "Perlikowski", "Przemyslaw", "" ], [ "Czolczynski", "Krzysztof", "" ], [ "Kapitaniak", "Tomasz", "" ] ]
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1402.1376
Gennady Koganov A
Gennady A. Koganov and Reuben Shuker
Super/Subradiant Second Harmonic Generation
null
null
null
null
physics.optics physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A scheme for active second harmonics generation is suggested. The system comprises $N$ three-level atoms in ladder configuration, situated into resonant cavity. It is found that the system can lase in either superradiant or subradiant regime, depending on the number of atoms $N$. When N passes some critical value the transition from the super to subradiance occurs in a phase-transition-like manner. Stability study of the steady state supports this conclusion.
[ { "created": "Thu, 6 Feb 2014 15:16:03 GMT", "version": "v1" } ]
2014-02-07
[ [ "Koganov", "Gennady A.", "" ], [ "Shuker", "Reuben", "" ] ]
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1402.1377
Edward Haeusler
Davi Romero de Vasconcelos and Edward Hermann Haeusler
Reasoning about Games via a First-order Modal Model Checking Approach
Extended version of article published in the SBMF 2007. Accepted to ENTCS. Withdrawn from ENTCS in 2014 in virtue to submission to other venue
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null
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cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this work, we present a logic based on first-order CTL, namely Game Analysis Logic (GAL), in order to reason about games. We relate models and solution concepts of Game Theory as models and formulas of GAL, respectively. Precisely, we express extensive games with perfect in- formation as models of GAL, and Nash equilibrium and subgame perfect equilibrium by means of formulas of GAL. From a practical point of view, we provide a GAL model checker in order to analyze games automatically. We use our model checker in at least two directions: to find solution con- cepts of Game Theory; and, to analyze players that are based on standard algorithms of the AI community, such as the minimax procedure.
[ { "created": "Thu, 6 Feb 2014 15:29:21 GMT", "version": "v1" }, { "created": "Mon, 14 Apr 2014 15:54:46 GMT", "version": "v2" } ]
2014-04-15
[ [ "de Vasconcelos", "Davi Romero", "" ], [ "Haeusler", "Edward Hermann", "" ] ]
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1402.1379
Jin-Kao Hao
Zhang-Hua Fu and Jin-Kao Hao
A Three-Phase Search Approach for the Quadratic Minimum Spanning Tree Problem
29 pages
null
null
null
cs.DS cs.NE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Given an undirected graph with costs associated with each edge as well as each pair of edges, the quadratic minimum spanning tree problem (QMSTP) consists of determining a spanning tree of minimum total cost. This problem can be used to model many real-life network design applications, in which both routing and interference costs should be considered. For this problem, we propose a three-phase search approach named TPS, which integrates 1) a descent-based neighborhood search phase using two different move operators to reach a local optimum from a given starting solution, 2) a local optima exploring phase to discover nearby local optima within a given regional search area, and 3) a perturbation-based diversification phase to jump out of the current regional search area. Additionally, we introduce dedicated techniques to reduce the neighborhood to explore and streamline the neighborhood evaluations. Computational experiments based on hundreds of representative benchmarks show that TPS produces highly competitive results with respect to the best performing approaches in the literature by improving the best known results for 31 instances and matching the best known results for the remaining instances only except two cases. Critical elements of the proposed algorithms are analyzed.
[ { "created": "Thu, 6 Feb 2014 15:31:49 GMT", "version": "v1" } ]
2014-02-07
[ [ "Fu", "Zhang-Hua", "" ], [ "Hao", "Jin-Kao", "" ] ]
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1402.1384
Florent Krzakala
Florent Krzakala and Andre Manoel and Eric W. Tramel and Lenka Zdeborova
Variational Free Energies for Compressed Sensing
5 pages, 3 figures
Information Theory Proceedings (ISIT), 2014 IEEE International Symposium on, page(s) 1499 - 1503
10.1109/ISIT.2014.6875083
null
cs.IT cond-mat.stat-mech math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider the variational free energy approach for compressed sensing. We first show that the na\"ive mean field approach performs remarkably well when coupled with a noise learning procedure. We also notice that it leads to the same equations as those used for iterative thresholding. We then discuss the Bethe free energy and how it corresponds to the fixed points of the approximate message passing algorithm. In both cases, we test numerically the direct optimization of the free energies as a converging sparse-estimationalgorithm.
[ { "created": "Thu, 6 Feb 2014 15:49:38 GMT", "version": "v1" } ]
2014-10-03
[ [ "Krzakala", "Florent", "" ], [ "Manoel", "Andre", "" ], [ "Tramel", "Eric W.", "" ], [ "Zdeborova", "Lenka", "" ] ]
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1402.1386
Philipp Singer
Philipp Singer, Fabian Fl\"ock, Clemens Meinhart, Elias Zeitfogel and Markus Strohmaier
Evolution of Reddit: From the Front Page of the Internet to a Self-referential Community?
Published in the proceedings of WWW'14 companion
null
10.1145/2567948.2576943
null
cs.SI cs.CY physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In the past few years, Reddit -- a community-driven platform for submitting, commenting and rating links and text posts -- has grown exponentially, from a small community of users into one of the largest online communities on the Web. To the best of our knowledge, this work represents the most comprehensive longitudinal study of Reddit's evolution to date, studying both (i) how user submissions have evolved over time and (ii) how the community's allocation of attention and its perception of submissions have changed over 5 years based on an analysis of almost 60 million submissions. Our work reveals an ever-increasing diversification of topics accompanied by a simultaneous concentration towards a few selected domains both in terms of posted submissions as well as perception and attention. By and large, our investigations suggest that Reddit has transformed itself from a dedicated gateway to the Web to an increasingly self-referential community that focuses on and reinforces its own user-generated image- and textual content over external sources.
[ { "created": "Thu, 6 Feb 2014 15:53:04 GMT", "version": "v1" }, { "created": "Wed, 12 Feb 2014 15:02:28 GMT", "version": "v2" }, { "created": "Mon, 23 Jun 2014 12:55:44 GMT", "version": "v3" } ]
2014-06-24
[ [ "Singer", "Philipp", "" ], [ "Flöck", "Fabian", "" ], [ "Meinhart", "Clemens", "" ], [ "Zeitfogel", "Elias", "" ], [ "Strohmaier", "Markus", "" ] ]
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null
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1402.1389
Yarin Gal
Yarin Gal, Mark van der Wilk, Carl E. Rasmussen
Distributed Variational Inference in Sparse Gaussian Process Regression and Latent Variable Models
9 pages, 8 figures
null
null
null
stat.ML cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Gaussian processes (GPs) are a powerful tool for probabilistic inference over functions. They have been applied to both regression and non-linear dimensionality reduction, and offer desirable properties such as uncertainty estimates, robustness to over-fitting, and principled ways for tuning hyper-parameters. However the scalability of these models to big datasets remains an active topic of research. We introduce a novel re-parametrisation of variational inference for sparse GP regression and latent variable models that allows for an efficient distributed algorithm. This is done by exploiting the decoupling of the data given the inducing points to re-formulate the evidence lower bound in a Map-Reduce setting. We show that the inference scales well with data and computational resources, while preserving a balanced distribution of the load among the nodes. We further demonstrate the utility in scaling Gaussian processes to big data. We show that GP performance improves with increasing amounts of data in regression (on flight data with 2 million records) and latent variable modelling (on MNIST). The results show that GPs perform better than many common models often used for big data.
[ { "created": "Thu, 6 Feb 2014 16:08:40 GMT", "version": "v1" }, { "created": "Mon, 29 Sep 2014 21:16:47 GMT", "version": "v2" } ]
2014-10-01
[ [ "Gal", "Yarin", "" ], [ "van der Wilk", "Mark", "" ], [ "Rasmussen", "Carl E.", "" ] ]
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Distributed Variational Inference in Sparse Gaussian Process Regression and Latent Variable Models
http://arxiv.org/abs/1402.1389v2
http://arxiv.org/pdf/1402.1389v2.pdf
https://github.com/markvdw/GParML
true
true
https://paperswithcode.com/paper/distributed-variational-inference-in-sparse
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1402.1397
Katrin Wolff
Marc Hennes, Katrin Wolff, Holger Stark
Self-induced polar order of active Brownian particles in a harmonic trap
5 pages, 4 figures, supplemental material and 2 videos
null
10.1103/PhysRevLett.112.238104
null
cond-mat.soft physics.bio-ph physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Hydrodynamically interacting active particles in an external harmonic potential form a self-assembled fluid pump at large enough P\'eclet numbers. Here, we give a quantitative criterion for the formation of the pump and show that particle orientations align in the self-induced flow field in surprising analogy to ferromagnetic order where the active P\'eclet number plays the role of inverse temperature. The particle orientations follow a Boltzmann distribution $\Phi(\mathbf{p}) \sim \exp(A p_z)$ where the ordering mean field $A$ scales with active P\'eclet number and polar order parameter. The mean flow field in which the particles' swimming directions align corresponds to a regularized stokeslet with strength proportional to swimming speed. Analytic mean-field results are compared with results from Brownian dynamics simulations with hydrodynamic interactions included and are found to capture the self-induced alignment very well.
[ { "created": "Thu, 6 Feb 2014 16:32:30 GMT", "version": "v1" } ]
2015-06-18
[ [ "Hennes", "Marc", "" ], [ "Wolff", "Katrin", "" ], [ "Stark", "Holger", "" ] ]
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1402.1399
Carlos Kornuta
Juan Toloza, Nelson Acosta, Carlos Kornuta
WiFiPos: An In/Out-Door Positioning Tool
7 pages, 6 figures, "Published with International Journal of Computer Trends and Technology (IJCTT)"
International Journal of Computer Trends and Technology (IJCTT.6(2).1-7.December 2013.Published by Seventh Sense Research Group
null
null
cs.NI
http://creativecommons.org/licenses/by/3.0/
Geographical location solutions have a wide diversity of applications, ranging from emergency services to access to tourist and entertainment services. GPS (Global Positioning System) is the most widely used system for outdoor areas. Since it requires a direct line of sight with the satellites, it cannot be used indoors. For indoor positioning, the most commonly used technology to calculate the position of mobile devices is Wi-Fi. In this article, we present a positioning tool called WiFiPos based on Wi-Fi signal processing. This tool uses different variations of the Fingerprint technique to analyze the performance and accuracy of the system both indoors and outdoors.
[ { "created": "Thu, 6 Feb 2014 16:36:22 GMT", "version": "v1" } ]
2014-02-07
[ [ "Toloza", "Juan", "" ], [ "Acosta", "Nelson", "" ], [ "Kornuta", "Carlos", "" ] ]
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1402.1402
Zhenlin Guo
Zhenlin Guo and Ping Lin and John S. Lowengrub
A numerical method for the quasi-incompressible Cahn-Hilliard-Navier-Stokes equations for variable density flows with a discrete energy law
null
null
10.1016/j.jcp.2014.07.038
null
math-ph math.MP math.NA physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we investigate numerically a diffuse interface model for the Navier-Stokes equation with fluid-fluid interface when the fluids have different densities \cite{Lowengrub1998}. Under minor reformulation of the system, we show that there is a continuous energy law underlying the system, assuming that all variables have reasonable regularities. It is shown in the literature that an energy law preserving method will perform better for multiphase problems. Thus for the reformulated system, we design a $C^0$ finite element method and a special temporal scheme where the energy law is preserved at the discrete level. Such a discrete energy law (almost the same as the continuous energy law) for this variable density two-phase flow model has never been established before with $C^0$ finite element. A Newton's method is introduced to linearise the highly non-linear system of our discretization scheme. Some numerical experiments are carried out using the adaptive mesh to investigate the scenario of coalescing and rising drops with differing density ratio. The snapshots for the evolution of the interface together with the adaptive mesh at different times are presented to show that the evolution, including the break-up/pinch-off of the drop, can be handled smoothly by our numerical scheme. The discrete energy functional for the system is examined to show that the energy law at the discrete level is preserved by our scheme.
[ { "created": "Thu, 6 Feb 2014 16:39:42 GMT", "version": "v1" }, { "created": "Wed, 19 Feb 2014 11:43:16 GMT", "version": "v2" } ]
2015-06-18
[ [ "Guo", "Zhenlin", "" ], [ "Lin", "Ping", "" ], [ "Lowengrub", "John S.", "" ] ]
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null
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1402.1404
Yusuke Uchiyama
Paolo W. Cattaneo, Matteo De Gerone, Flavio Gatti, Miki Nishimura, Wataru Ootani, Massimo Rossella and Yusuke Uchiyama
Development of High Precision Timing Counter Based on Plastic Scintillator with SiPM Readout
11 pages, 17 figures, accepted by IEEE Trans. Nucl. Sci
IEEE Trans. Nucl. Sci. 61, 2657-2666 (2014)
10.1109/TNS.2014.2347576
null
physics.ins-det hep-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
High-time-resolution counters based on plastic scintillator with silicon photomultiplier (SiPM) readout have been developed for applications to high energy physics experiments for which relatively large-sized counters are required. We have studied counter sizes up to $120\times40\times5$ mm^3 with series connection of multiple SiPMs to increase the sensitive area and thus achieve better time resolution. A readout scheme with analog shaping and digital waveform analysis is optimized to achieve the highest time resolution. The timing performance is measured using electrons from a Sr-90 radioactive source, comparing different scintillators, counter dimensions, and types of near-ultraviolet sensitive SiPMs. As a result, a resolution of $\sigma =42 \pm 2$ ps at 1 MeV energy deposition is obtained for counter size $60\times 30 \times 5$ mm^3 with three SiPMs ($3\times3$ mm^2 each) at each end of the scintillator. The time resolution improves with the number of photons detected by the SiPMs. The SiPMs from Hamamatsu Photonics give the best time resolution because of their high photon detection efficiency in the near-ultraviolet region. Further improvement is possible by increasing the number of SiPMs attached to the scintillator.
[ { "created": "Thu, 6 Feb 2014 16:45:48 GMT", "version": "v1" }, { "created": "Mon, 11 Aug 2014 15:26:53 GMT", "version": "v2" } ]
2014-10-17
[ [ "Cattaneo", "Paolo W.", "" ], [ "De Gerone", "Matteo", "" ], [ "Gatti", "Flavio", "" ], [ "Nishimura", "Miki", "" ], [ "Ootani", "Wataru", "" ], [ "Rossella", "Massimo", "" ], [ "Uchiyama", "Yusuke", "" ] ]
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1402.1409
Mikhail Tamm
Mikhail V. Tamm, Vladimir I. Stadnichuk, Alena M. Ilyina and Denis S. Grebenkov
Overlap of two Brownian trajectories: exact results for scaling functions
null
Phys. Rev. E 89, 042137 (2014)
10.1103/PhysRevE.89.042137
null
math-ph cond-mat.stat-mech math.MP physics.data-an
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider two random walkers starting at the same time $t=0$ from different points in space separated by a given distance $R$. We compute the average volume of the space visited by both walkers up to time $t$ as a function of $R$ and $t$ and dimensionality of space $d$. For $d<4$, this volume, after proper renormalization, is shown to be expressed through a scaling function of a single variable $R/\sqrt{t}$. We provide general integral formulas for scaling functions for arbitrary dimensionality $d<4$. In contrast, we show that no scaling function exists for higher dimensionalities $d \geq 4$
[ { "created": "Thu, 6 Feb 2014 17:06:56 GMT", "version": "v1" } ]
2016-01-07
[ [ "Tamm", "Mikhail V.", "" ], [ "Stadnichuk", "Vladimir I.", "" ], [ "Ilyina", "Alena M.", "" ], [ "Grebenkov", "Denis S.", "" ] ]
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1402.1419
Heide Ibrahim
Heide Ibrahim, Benji Wales, Samuel Beaulieu, Bruno E. Schmidt, Nicolas Thir\'e, \'Eric Bisson, Christoph T. Hebeisen, Vincent Wanie, Mathieu Gigu\'ere, Jean-Claude Kieffer, Joseph Sanderson, Michael S. Schuurman, and Fran\c{c}ois L\'egar\'e
Tabletop imaging of structural evolutions in chemical reactions
null
null
10.1007/978-3-319-13242-6_31
null
physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The introduction of femto-chemistry has made it a primary goal to follow the nuclear and electronic evolution of a molecule in time and space as it undergoes a chemical reaction. Using Coulomb Explosion Imaging we have shot the first high-resolution molecular movie of a to and fro isomerization process in the acetylene cation. So far, this kind of phenomenon could only be observed using VUV light from a Free Electron Laser [Phys. Rev. Lett. 105, 263002 (2010)]. Here we show that 266 nm ultrashort laser pulses are capable of initiating rich dynamics through multiphoton ionization. With our generally applicable tabletop approach that can be used for other small organic molecules, we have investigated two basic chemical reactions simultaneously: proton migration and C=C bond-breaking, triggered by multiphoton ionization. The experimental results are in excellent agreement with the timescales and relaxation pathways predicted by new and definitively quantitative ab initio trajectory simulations.
[ { "created": "Thu, 6 Feb 2014 17:23:50 GMT", "version": "v1" } ]
2017-11-22
[ [ "Ibrahim", "Heide", "" ], [ "Wales", "Benji", "" ], [ "Beaulieu", "Samuel", "" ], [ "Schmidt", "Bruno E.", "" ], [ "Thiré", "Nicolas", "" ], [ "Bisson", "Éric", "" ], [ "Hebeisen", "Christoph T.", "" ], [ "Wanie", "Vincent", "" ], [ "Giguére", "Mathieu", "" ], [ "Kieffer", "Jean-Claude", "" ], [ "Sanderson", "Joseph", "" ], [ "Schuurman", "Michael S.", "" ], [ "Légaré", "François", "" ] ]
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1402.1425
Ragnar Nevries
Ragnar Nevries and Christian Rosenke
Towards a Characterization of Leaf Powers by Clique Arrangements
null
null
null
null
cs.DM math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The class ${\cal L}_k$ of $k$-leaf powers consists of graphs $G=(V,E)$ that have a $k$-leaf root, that is, a tree $T$ with leaf set $V$, where $xy \in E$, if and only if the $T$-distance between $x$ and $y$ is at most $k$. Structure and linear time recognition algorithms have been found for $2$-, $3$-, $4$-, and, to some extent, $5$-leaf powers, and it is known that the union of all $k$-leaf powers, that is, the graph class ${\cal L} = \bigcup_{k=2}^\infty {\cal L}_k$, forms a proper subclass of strongly chordal graphs. Despite from that, no essential progress has been made lately. In this paper, we use the new notion of clique arrangements to suggest that leaf powers are a natural special case of strongly chordal graphs. The clique arrangement ${\cal A}(G)$ of a chordal graph $G$ is a directed graph that represents the intersections between maximal cliques of $G$ by nodes and the mutual inclusion of these vertex subsets by arcs. Recently, strongly chordal graphs have been characterized as the graphs that have a clique arrangement without bad $k$-cycles for $k \geq 3$. We show that the clique arrangement of every graph of ${\cal L}$ is free of bad $2$-cycles. The question whether this characterizes the class ${\cal L}$ exactly remains open.
[ { "created": "Thu, 6 Feb 2014 17:35:18 GMT", "version": "v1" } ]
2014-02-07
[ [ "Nevries", "Ragnar", "" ], [ "Rosenke", "Christian", "" ] ]
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1402.1429
Zheng Qu
Stephane Gaubert and Zheng Qu
Checking the strict positivity of Kraus maps is NP-hard
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null
null
null
cs.CC cs.IT math.IT math.OA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Basic properties in Perron-Frobenius theory are strict positivity, primitivityand irreducibility. Whereas for nonnegative matrices, these properties are equivalent to elementary graph properties which can be checked in polynomial time, we show that for Kraus maps- the noncommutative generalization of stochastic matrices - checking strict positivity (whether the map sends the cone to its interior) is NP-hard. The proof proceeds by reducing to the latter problem the existence of a non-zero solution of a special system of bilinear equations. The complexity of irreducibility and primitivity is also discussed in the noncommutative setting.
[ { "created": "Thu, 6 Feb 2014 17:38:57 GMT", "version": "v1" } ]
2014-02-07
[ [ "Gaubert", "Stephane", "" ], [ "Qu", "Zheng", "" ] ]
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1402.1431
Theivasanthi Thirugnanasambandan
T.Theivasanthi and M.Alagar
Innovation of Superparamagnetism in Lead Nanoparticles
Transition to Superparamagnetism of Pb nanoparticles. 10 pages 2 Tables, 3 Figures, 4 equations, 45 References
Physics and Technical Sciences. 2013, 1(3): 39-45
10.12966/pts.10.01.2013
null
cond-mat.mtrl-sci physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This work reports, some of the features related to the room temperature superparamagnetic behaviours of lead nanoparticles. Such behaviours have not been discussed elaborately, in any literatures, so far. It is obvious from our studies that the superparamagnetic behaviours of Pb nanoparticles are surprising behaviours, since bulk Pb has diamagnetic behaviours. Hysteresis curve from Vibrating Sample Magnetometer study of Pb nanopowder (metal) serves some new observations. The successful calculations of values like magnetic size, saturation magnetization, coercive field, and remanent magnetism confirm its superparamagnetic nature and explore its potential application in various industries. This work throws some light on and helps further research.
[ { "created": "Wed, 5 Feb 2014 07:41:31 GMT", "version": "v1" } ]
2014-02-07
[ [ "Theivasanthi", "T.", "" ], [ "Alagar", "M.", "" ] ]
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1402.1433
Volker Tritschler K
V. K. Tritschler, B. J. Olson, S. K. Lele, S. Hickel, X. Y. Hu, N. A. Adams
On the Richtmyer-Meshkov instability evolving from a deterministic multimode planar interface
34 pages, submitted to Journal of Fluid Mechanics
null
10.1017/jfm.2014.436
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We investigate the shock-induced turbulent mixing between a light and heavy gas, where a Richtmyer-Meshkov instability (RMI) is initiated by a $\Ma = 1.5$ shock wave. The prescribed initial conditions define a deterministic multimode interface perturbation between the gases, which can be imposed exactly for different simulation codes and resolutions to allow for quantitative comparison. Well-resolved large-eddy simulations are performed using two different and independently developed numerical methods with the objective of assessing turbulence structures, prediction uncertainties and convergence behaviour. The two numerical methods differ fundamentally with respect to the employed subgrid-scale regularisation, each representing state-of-the-art approaches to RMI. Unlike previous studies the focus of the present investigation is to quantify uncertainties introduced by the numerical method, as there is strong evidence that subgrid-scale regularisation and truncation errors may have a significant effect on the linear and non-linear stages of the RMI evolution. Fourier diagnostics reveal that the larger energy containing scales converge rapidly with increasing mesh resolution and thus are in excellent agreement for the two numerical methods. Spectra of gradient dependent quantities, such as enstrophy and scalar dissipation rate, show stronger dependencies on the small-scale flow field structures in consequence of truncation error effects, which for one numerical method are dominantly dissipative and for the other dominantly dispersive.
[ { "created": "Thu, 6 Feb 2014 17:46:22 GMT", "version": "v1" }, { "created": "Fri, 13 Jun 2014 08:56:27 GMT", "version": "v2" } ]
2015-06-18
[ [ "Tritschler", "V. K.", "" ], [ "Olson", "B. J.", "" ], [ "Lele", "S. K.", "" ], [ "Hickel", "S.", "" ], [ "Hu", "X. Y.", "" ], [ "Adams", "N. A.", "" ] ]
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1402.1435
Helene Mathis
Fran\c{c}ois James (MAPMO), H\'el\`ene Mathis (LMJL)
Modeling phase transition and metastable phases
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math.NA math.AP physics.class-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose a model that describes phase transition including metastable phases present in the van der Waals Equation of State (EoS). We introduce a dynamical system that is able to depict the mass transfer between two phases, for which equilibrium states are both metastable and stable states, including mixtures. The dynamical system is then used as a relaxation source term in a isothermal two-phase model. We use a Finite volume scheme (FV) that treats the convective part and the source term in a fractional step way. Numerical results illustrate the ability of the model to capture phase transition and metastable states.
[ { "created": "Thu, 6 Feb 2014 17:51:25 GMT", "version": "v1" } ]
2014-02-07
[ [ "James", "François", "", "MAPMO" ], [ "Mathis", "Hélène", "", "LMJL" ] ]
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1402.1438
Perry Nicolas
Alexandre Candlot (IRCCyN), Nicolas Perry (LGM2B), Alain Bernard (IRCCyN), Samar Ammar-Khodja (IRCCyN)
Deployment of an Innovative Resource Choice Method for Process Planning
null
CIRP Journal of Manufacturing Systems 35, 5 (2006) 487-506
null
null
cs.OH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Designers, process planners and manufacturers naturally consider different concepts for a same object. The stiffness of production means and the design specification requirements mark out process planners as responsible of the coherent integration of all constraints. First, this paper details an innovative solution of resource choice, applied for aircraft manufacturing parts. In a second part, key concepts are instanced for the considered industrial domain. Finally, a digital mock up validates the solution viability and demonstrates the possibility of an in-process knowledge capitalisation and use. Formalising the link between Design and Manufacturing allows to hope enhancements of simultaneous Product / Process developments.
[ { "created": "Wed, 5 Feb 2014 14:34:31 GMT", "version": "v1" } ]
2014-02-07
[ [ "Candlot", "Alexandre", "", "IRCCyN" ], [ "Perry", "Nicolas", "", "LGM2B" ], [ "Bernard", "Alain", "", "IRCCyN" ], [ "Ammar-Khodja", "Samar", "", "IRCCyN" ] ]
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1402.1445
Eleonora Alfinito Dr.
E. Alfinito and L. Reggiani
Opsin vs opsin: new materials for biotechnological applications
10 pages, 8 figures revised version with more figures
J. Appl. Phys. 116, 064901 (2014)
10.1063/1.4892445
null
q-bio.BM cond-mat.soft physics.bio-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The need of new diagnostic methods satisfying, as an early detection, a low invasive procedure and a cost-efficient value, is orienting the technological research toward the use of bio-integrated devices, in particular bio-sensors. The set of know-why necessary to achieve this goal is wide, from biochemistry to electronics and is summarized in an emerging branch of electronics, called \textit{proteotronics}. Proteotronics is here here applied to state a comparative analysis of the electrical responses coming from type-1 and type-2 opsins. In particular, the procedure is used as an early investigation of a recently discovered family of opsins, the proteorhodopsins activated by blue light, BPRs. The results reveal some interesting and unexpected similarities between proteins of the two families, suggesting the global electrical response are not strictly linked to the class identity.
[ { "created": "Mon, 3 Feb 2014 16:04:28 GMT", "version": "v1" }, { "created": "Wed, 9 Jul 2014 14:52:25 GMT", "version": "v2" }, { "created": "Sat, 9 Aug 2014 08:39:08 GMT", "version": "v3" } ]
2015-06-18
[ [ "Alfinito", "E.", "" ], [ "Reggiani", "L.", "" ] ]
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1402.1447
Athanasios Laliotis
Thierry Passerat de Silans, Athanasios Laliotis, Isabelle Maurin, Marie Pascale Gorza, Pedro Chaves de Souza Segundo, Martial Ducloy, Daniel Bloch
Experimental observations of temperature effects in the near-field regime of the Casimir-Polder interaction
accepted for publication in Laser Physics
null
10.1088/1054-660X/24/7/074009
null
physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We investigate the temperature dependence of the Casimir-Polder interaction in the electrostatic limit. This unusual phenomenon relies on the coupling between a virtual atomic transition and a thermal excitation of surface polariton modes. We first focus on the scenario where a Cs(8P3/2) atom is next to a CaF2 or a BaF2 surface. Our theoretical predictions show a strong temperature dependence of the van der Waals coefficient at experimentally accessible conditions. A series of spectroscopic measurements performed in a specially designed Cs vapour cell containing a CaF2 tube is presented. Our results illustrate the sensitivity of atom surface-interaction experiments to the quality and chemical stability of the surface material and emphasize the need of using more durable materials, such as sapphire. We finally discuss selective reflection experiments on Cs(7D3/2) in an all-sapphire cell that clearly demonstrate a temperature dependent van der Waals coefficient.
[ { "created": "Thu, 6 Feb 2014 18:21:18 GMT", "version": "v1" } ]
2015-06-18
[ [ "de Silans", "Thierry Passerat", "" ], [ "Laliotis", "Athanasios", "" ], [ "Maurin", "Isabelle", "" ], [ "Gorza", "Marie Pascale", "" ], [ "Segundo", "Pedro Chaves de Souza", "" ], [ "Ducloy", "Martial", "" ], [ "Bloch", "Daniel", "" ] ]
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1402.1448
Maarten Biesheuvel
P.M. Biesheuvel, D. Brogioli, H.V.M. Hamelers
Electrostatic cooling in Ion-Exchange Membranes
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physics.chem-ph cond-mat.soft
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In ion-exchange membrane processes, ions and water flow under the influence of gradients in hydrostatic pressure, ion chemical potential, and electrical potential (voltage), leading to solvent flow, ionic fluxes and ionic current. At the outer surfaces of the membranes, electrical double layers (EDLs) are formed (Donnan layers). When a current flows through the membrane, we argue that besides Joule heating in the bulk of the membrane and in the electrolyte outside the membrane, there is also electrostatic heating and cooling in the EDLs. In addition, when fluid flows through a charged membrane, at the outsides of the membrane there is pressure-related heating or cooling due to the osmotic and hydrostatic pressure differences across the EDLs.
[ { "created": "Thu, 6 Feb 2014 18:22:07 GMT", "version": "v1" }, { "created": "Fri, 28 Jun 2019 14:54:45 GMT", "version": "v2" } ]
2019-07-01
[ [ "Biesheuvel", "P. M.", "" ], [ "Brogioli", "D.", "" ], [ "Hamelers", "H. V. M.", "" ] ]
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1402.1450
Luca Bortolussi
Luca Bortolussi and Dimitrios Milios and Guido Sanguinetti
Smoothed Model Checking for Uncertain Continuous Time Markov Chains
null
null
null
null
cs.LO cs.SY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider the problem of computing the satisfaction probability of a formula for stochastic models with parametric uncertainty. We show that this satisfaction probability is a smooth function of the model parameters. This enables us to devise a novel Bayesian statistical algorithm which performs statistical model checking simultaneously for all values of the model parameters from observations of truth values of the formula over individual runs of the model at isolated parameter values. This is achieved by exploiting the smoothness of the satisfaction function: by modelling explicitly correlations through a prior distribution over a space of smooth functions (a Gaussian Process), we can condition on observations at individual parameter values to construct an analytical approximation of the function itself. Extensive experiments on non-trivial case studies show that the approach is accurate and several orders of magnitude faster than naive parameter exploration with standard statistical model checking methods.
[ { "created": "Thu, 6 Feb 2014 18:23:28 GMT", "version": "v1" }, { "created": "Wed, 22 Oct 2014 12:10:39 GMT", "version": "v2" } ]
2014-10-23
[ [ "Bortolussi", "Luca", "" ], [ "Milios", "Dimitrios", "" ], [ "Sanguinetti", "Guido", "" ] ]
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1402.1454
Sarath Chandar A P
Sarath Chandar A P, Stanislas Lauly, Hugo Larochelle, Mitesh M. Khapra, Balaraman Ravindran, Vikas Raykar, Amrita Saha
An Autoencoder Approach to Learning Bilingual Word Representations
10 pages
null
null
null
cs.CL cs.LG stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Cross-language learning allows us to use training data from one language to build models for a different language. Many approaches to bilingual learning require that we have word-level alignment of sentences from parallel corpora. In this work we explore the use of autoencoder-based methods for cross-language learning of vectorial word representations that are aligned between two languages, while not relying on word-level alignments. We show that by simply learning to reconstruct the bag-of-words representations of aligned sentences, within and between languages, we can in fact learn high-quality representations and do without word alignments. Since training autoencoders on word observations presents certain computational issues, we propose and compare different variations adapted to this setting. We also propose an explicit correlation maximizing regularizer that leads to significant improvement in the performance. We empirically investigate the success of our approach on the problem of cross-language test classification, where a classifier trained on a given language (e.g., English) must learn to generalize to a different language (e.g., German). These experiments demonstrate that our approaches are competitive with the state-of-the-art, achieving up to 10-14 percentage point improvements over the best reported results on this task.
[ { "created": "Thu, 6 Feb 2014 18:53:30 GMT", "version": "v1" } ]
2014-02-07
[ [ "P", "Sarath Chandar A", "" ], [ "Lauly", "Stanislas", "" ], [ "Larochelle", "Hugo", "" ], [ "Khapra", "Mitesh M.", "" ], [ "Ravindran", "Balaraman", "" ], [ "Raykar", "Vikas", "" ], [ "Saha", "Amrita", "" ] ]
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1402.1461
Andrea Franchi
A. Franchi, L. Farvacque, F. Ewald, G. Le Bec, K. B. Scheidt
First simultaneous measurement of sextupolar and octupolar resonance driving terms in a circular accelerator from turn-by-turn beam position monitors data
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null
10.1103/PhysRevSTAB.17.074001
null
physics.acc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Beam lifetime in storage rings and colliders is affected by, among other effects, lattice nonlinearities. Their control are of great benefit to the dynamic aperture of an accelerator, whose enlargement leads in general to more efficient injection and longer lifetime. This article describes a procedure to evaluate and correct unwanted nonlinearities by using turn-by-turn beam position monitor data, which is an evolution of previous works on the resonance driving terms (RDTs). Effective sextupole magnetic errors and tilts at the ESRF electron storage ring are evaluated and corrected (when possible) by using this technique. For the first time, also octupolar RDTs could be measured and used to define an octupolar model for the main quadrupoles. Most of the deviations from the model observed in the sextupolar RDTs of the ESRF storage ring turned out to be generated by focusing errors rather than by sextupole errors. These results could be achieved thanks to new analytical formulas describing the harmonic content of the nonlinear betatron motion to the second order. For the first time, RDTs have been also used for beam-based calibration of individual sextupole magnets. They also proved to be a powerful tool in predicting faulty magnets and in validating magnetic models. This technique provides also a figure of merit for a self-assessment of the reliability of the data analysis.
[ { "created": "Thu, 6 Feb 2014 19:14:38 GMT", "version": "v1" }, { "created": "Tue, 17 Apr 2018 08:08:18 GMT", "version": "v2" } ]
2018-04-18
[ [ "Franchi", "A.", "" ], [ "Farvacque", "L.", "" ], [ "Ewald", "F.", "" ], [ "Bec", "G. Le", "" ], [ "Scheidt", "K. B.", "" ] ]
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1402.1466
Alex Mrozack
Alex Mrozack, Martin Heimbeck, Daniel L. Marks, Jonathan Richard, Henry O. Everitt, David J. Brady
Compressive and Adaptive Millimeter-wave SAR
null
null
null
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We apply adaptive sensing techniques to the problem of locating sparse metallic scatterers using high-resolution, frequency modulated continuous wave W-band RADAR. Using a single detector, a frequency stepped source, and a lateral translation stage, inverse synthetic aperture RADAR reconstruction techniques are used to search for one or two wire scatterers within a specified range, while an adaptive algorithm determined successive sampling locations. The two-dimensional location of each scatterer is thereby identified with sub-wavelength accuracy in as few as 1/4 the number of lateral steps required for a simple raster scan. The implications of applying this approach to more complex scattering geometries are explored in light of the various assumptions made.
[ { "created": "Thu, 6 Feb 2014 19:54:34 GMT", "version": "v1" } ]
2014-02-07
[ [ "Mrozack", "Alex", "" ], [ "Heimbeck", "Martin", "" ], [ "Marks", "Daniel L.", "" ], [ "Richard", "Jonathan", "" ], [ "Everitt", "Henry O.", "" ], [ "Brady", "David J.", "" ] ]
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1402.1467
Evgeny Nikulchev
Evgeny Nikulchev
Reconstruction Models for Attractors in the Technical and Economic Processes
5 pages
International Journal of Computer Trends and Technology. 2013. V.6 N.3. P.171-175
10.14445/22312803/IJCTT-V6N3P128
null
cs.CE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The article discusses building models based on the reconstructed attractors of the time series. Discusses the use of the properties of dynamical chaos, namely to identify the strange attractors structure models. Here is used the group properties of differential equations, which consist in the symmetry of particular solutions. Examples of modeling engineering systems are given.
[ { "created": "Thu, 6 Feb 2014 19:54:39 GMT", "version": "v1" } ]
2014-02-07
[ [ "Nikulchev", "Evgeny", "" ] ]
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1402.1469
Evgeny Nikulchev
Evgeniy Pluzhnik, Evgeny Nikulchev
Use of Dynamical Systems Modeling to Hybrid Cloud Database
8 pages
International Journal of Communications, Network and System Sciences.2013.V.6. N.12. PP. 505-512
10.4236/ijcns.2013.612054
null
cs.DB
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In the article, an experiment is aimed at clarifying the transfer efficiency of the database in the cloud infrastructure. The system was added to the control unit, which has guided the database search in the local part or in the cloud. It is shown that the time data acquisition remains unchanged as a result of modification. Suggestions have been made about the use of the theory of dynamic systems to hybrid cloud database. The present work is aimed at attracting the attention of spe-cialists in the field of cloud database to the apparatus control theory. The experiment presented in this article allows the use of the description of the known methods for solving important practical problems.
[ { "created": "Thu, 6 Feb 2014 19:59:14 GMT", "version": "v1" } ]
2014-02-07
[ [ "Pluzhnik", "Evgeniy", "" ], [ "Nikulchev", "Evgeny", "" ] ]
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1402.1473
Yuxin Chen
Yuxin Chen and Leonidas J. Guibas and Qi-Xing Huang
Near-Optimal Joint Object Matching via Convex Relaxation
null
31st International Conference on Machine Learning, vol. 32, pp. 100 - 108, June 2014
null
null
cs.LG cs.CV cs.IT math.IT math.OC stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Joint matching over a collection of objects aims at aggregating information from a large collection of similar instances (e.g. images, graphs, shapes) to improve maps between pairs of them. Given multiple matches computed between a few object pairs in isolation, the goal is to recover an entire collection of maps that are (1) globally consistent, and (2) close to the provided maps --- and under certain conditions provably the ground-truth maps. Despite recent advances on this problem, the best-known recovery guarantees are limited to a small constant barrier --- none of the existing methods find theoretical support when more than $50\%$ of input correspondences are corrupted. Moreover, prior approaches focus mostly on fully similar objects, while it is practically more demanding to match instances that are only partially similar to each other. In this paper, we develop an algorithm to jointly match multiple objects that exhibit only partial similarities, given a few pairwise matches that are densely corrupted. Specifically, we propose to recover the ground-truth maps via a parameter-free convex program called MatchLift, following a spectral method that pre-estimates the total number of distinct elements to be matched. Encouragingly, MatchLift exhibits near-optimal error-correction ability, i.e. in the asymptotic regime it is guaranteed to work even when a dominant fraction $1-\Theta\left(\frac{\log^{2}n}{\sqrt{n}}\right)$ of the input maps behave like random outliers. Furthermore, MatchLift succeeds with minimal input complexity, namely, perfect matching can be achieved as soon as the provided maps form a connected map graph. We evaluate the proposed algorithm on various benchmark data sets including synthetic examples and real-world examples, all of which confirm the practical applicability of MatchLift.
[ { "created": "Thu, 6 Feb 2014 20:16:35 GMT", "version": "v1" } ]
2015-01-06
[ [ "Chen", "Yuxin", "" ], [ "Guibas", "Leonidas J.", "" ], [ "Huang", "Qi-Xing", "" ] ]
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1402.1484
Ioannis Psarros
Ioannis Z. Emiris, Ioannis Psarros
Counting Euclidean embeddings of rigid graphs
10 pages, 5 figures
null
null
null
cs.CG math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A graph is called (generically) rigid in $\mathbb{R}^d$ if, for any choice of sufficiently generic edge lengths, it can be embedded in $\mathbb{R}^d$ in a finite number of distinct ways, modulo rigid transformations. Here we deal with the problem of determining the maximum number of planar Euclidean embeddings as a function of the number of the vertices. We obtain polynomial systems which totally capture the structure of a given graph, by exploiting distance geometry theory. Consequently, counting the number of Euclidean embeddings of a given rigid graph, reduces to the problem of counting roots of the corresponding polynomial system.
[ { "created": "Thu, 6 Feb 2014 20:50:22 GMT", "version": "v1" }, { "created": "Wed, 25 Jan 2017 16:33:35 GMT", "version": "v2" } ]
2017-01-26
[ [ "Emiris", "Ioannis Z.", "" ], [ "Psarros", "Ioannis", "" ] ]
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1402.1485
Jan Sykora
Jan S\'ykora and Anna Ku\v{c}erov\'a
Uncertainty Propagation in Elasto-Plastic Material
null
null
null
null
cs.CE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Macroscopically heterogeneous materials, characterised mostly by comparable heterogeneity lengthscale and structural sizes, can no longer be modelled by deterministic approach instead. It is convenient to introduce stochastic approach with uncertain material parameters quantified as random fields and/or random variables. The present contribution is devoted to propagation of these uncertainties in mechanical modelling of inelastic behaviour. In such case the Monte Carlo method is the traditional approach for solving the proposed problem. Nevertheless, convergence rate is relatively slow, thus new methods (e.g. stochastic Galerkin method, stochastic collocation approach, etc.) have been recently developed to offer fast convergence for sufficiently smooth solution in the probability space. Our goal is to accelerate the uncertainty propagation using a polynomial chaos expansion based on stochastic collocation method. The whole concept is demonstrated on a simple numerical example of uniaxial test at a material point where interesting phenomena can be clearly understood.
[ { "created": "Thu, 6 Feb 2014 20:55:49 GMT", "version": "v1" } ]
2014-02-07
[ [ "Sýkora", "Jan", "" ], [ "Kučerová", "Anna", "" ] ]
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1402.1488
Jarmo M\"akel\"a Dr.
Jarmo M\"akel\"a
Vacuum Energy, Black Holes and the Cosmological Constant
An essay submitted to the Gravity Research Foundation 2014 Awards for Essays on Gravitation
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null
null
physics.gen-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider a possibility that the formally infinite vacuum energy of the quantized matter fields could be stored into Planck-size quantum black holes acting as the fundamental constituents of space and time. Using the recently proposed thermodynamical equation of state obeyed by the cosmological constant we indicate, how this idea might explain the smallness of the cosmological constant, if the vacuum energy is the source of the cosmological constant.
[ { "created": "Thu, 6 Feb 2014 17:45:53 GMT", "version": "v1" } ]
2014-02-10
[ [ "Mäkelä", "Jarmo", "" ] ]
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1402.1500
Eran Shaham Mr.
Eran Shaham, David Sarne, Boaz Ben-Moshe
Co-clustering of Fuzzy Lagged Data
Under consideration for publication in Knowledge and Information Systems. The final publication is available at Springer via http://dx.doi.org/10.1007/s10115-014-0758-7
null
10.1007/s10115-014-0758-7
null
cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The paper focuses on mining patterns that are characterized by a fuzzy lagged relationship between the data objects forming them. Such a regulatory mechanism is quite common in real life settings. It appears in a variety of fields: finance, gene expression, neuroscience, crowds and collective movements are but a limited list of examples. Mining such patterns not only helps in understanding the relationship between objects in the domain, but assists in forecasting their future behavior. For most interesting variants of this problem, finding an optimal fuzzy lagged co-cluster is an NP-complete problem. We thus present a polynomial-time Monte-Carlo approximation algorithm for mining fuzzy lagged co-clusters. We prove that for any data matrix, the algorithm mines a fuzzy lagged co-cluster with fixed probability, which encompasses the optimal fuzzy lagged co-cluster by a maximum 2 ratio columns overhead and completely no rows overhead. Moreover, the algorithm handles noise, anti-correlations, missing values and overlapping patterns. The algorithm was extensively evaluated using both artificial and real datasets. The results not only corroborate the ability of the algorithm to efficiently mine relevant and accurate fuzzy lagged co-clusters, but also illustrate the importance of including the fuzziness in the lagged-pattern model.
[ { "created": "Thu, 6 Feb 2014 21:02:16 GMT", "version": "v1" }, { "created": "Thu, 15 May 2014 12:01:08 GMT", "version": "v2" } ]
2014-05-16
[ [ "Shaham", "Eran", "" ], [ "Sarne", "David", "" ], [ "Ben-Moshe", "Boaz", "" ] ]
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null
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1402.1503
Ganesh Sundaramoorthi
Omar Arif, Ganesh Sundaramoorthi, Byung-Woo Hong, Anthony Yezzi
Tracking via Motion Estimation with Physically Motivated Inter-Region Constraints
19 pages
null
null
null
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we propose a method for tracking structures (e.g., ventricles and myocardium) in cardiac images (e.g., magnetic resonance) by propagating forward in time a previous estimate of the structures via a new deformation estimation scheme that is motivated by physical constraints of fluid motion. The method employs within structure motion estimation (so that differing motions among different structures are not mixed) while simultaneously satisfying the physical constraint in fluid motion that at the interface between a fluid and a medium, the normal component of the fluid's motion must match the normal component of the motion of the medium. We show how to estimate the motion according to the previous considerations in a variational framework, and in particular, show that these conditions lead to PDEs with boundary conditions at the interface that resemble Robin boundary conditions and induce coupling between structures. We illustrate the use of this motion estimation scheme in propagating a segmentation across frames and show that it leads to more accurate segmentation than traditional motion estimation that does not make use of physical constraints. Further, the method is naturally suited to interactive segmentation methods, which are prominently used in practice in commercial applications for cardiac analysis, where typically a segmentation from the previous frame is used to predict a segmentation in the next frame. We show that our propagation scheme reduces the amount of user interaction by predicting more accurate segmentations than commonly used and recent interactive commercial techniques.
[ { "created": "Thu, 6 Feb 2014 21:27:25 GMT", "version": "v1" } ]
2014-02-10
[ [ "Arif", "Omar", "" ], [ "Sundaramoorthi", "Ganesh", "" ], [ "Hong", "Byung-Woo", "" ], [ "Yezzi", "Anthony", "" ] ]
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1402.1510
Maura Brunetti
Maura Brunetti, Nad\`ege Marchiando, Nicolas Berti, J\'er\^ome Kasparian
Nonlinear fast growth of water waves under wind forcing
7 pages, 4 figures, accepted in Phys. Lett. A
null
10.1016/j.physleta.2014.02.004
null
physics.ao-ph physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In the wind-driven wave regime, the Miles mechanism gives an estimate of the growth rate of the waves under the effect of wind. We consider the case where this growth rate, normalised with respect to the frequency of the carrier wave, is of the order of the wave steepness. Using the method of multiple scales, we calculate the terms which appear in the nonlinear Schr\"odinger (NLS) equation in this regime of fast-growing waves. We define a coordinate transformation which maps the forced NLS equation into the standard NLS with constant coefficients, that has a number of known analytical soliton solutions. Among these solutions, the Peregrine and the Akhmediev solitons show an enhancement of both their lifetime and maximum amplitude which is in qualitative agreement with the results of tank experiments and numerical simulations of dispersive focusing under the action of wind.
[ { "created": "Thu, 6 Feb 2014 22:03:11 GMT", "version": "v1" } ]
2015-06-18
[ [ "Brunetti", "Maura", "" ], [ "Marchiando", "Nadège", "" ], [ "Berti", "Nicolas", "" ], [ "Kasparian", "Jérôme", "" ] ]
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1402.1515
Jianshu Chen
Jianshu Chen, Zaid J. Towfic, Ali H. Sayed
Dictionary Learning over Distributed Models
16 pages, 8 figures. To appear in IEEE Transactions on Signal Processing
null
10.1109/TSP.2014.2385045
null
cs.LG cs.DC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we consider learning dictionary models over a network of agents, where each agent is only in charge of a portion of the dictionary elements. This formulation is relevant in Big Data scenarios where large dictionary models may be spread over different spatial locations and it is not feasible to aggregate all dictionaries in one location due to communication and privacy considerations. We first show that the dual function of the inference problem is an aggregation of individual cost functions associated with different agents, which can then be minimized efficiently by means of diffusion strategies. The collaborative inference step generates dual variables that are used by the agents to update their dictionaries without the need to share these dictionaries or even the coefficient models for the training data. This is a powerful property that leads to an effective distributed procedure for learning dictionaries over large networks (e.g., hundreds of agents in our experiments). Furthermore, the proposed learning strategy operates in an online manner and is able to respond to streaming data, where each data sample is presented to the network once.
[ { "created": "Thu, 6 Feb 2014 22:19:19 GMT", "version": "v1" }, { "created": "Sun, 7 Dec 2014 05:40:44 GMT", "version": "v2" } ]
2015-06-18
[ [ "Chen", "Jianshu", "" ], [ "Towfic", "Zaid J.", "" ], [ "Sayed", "Ali H.", "" ] ]
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1402.1518
Edisher Kaghashvili
Edisher Kh. Kaghashvili
Alfv\'en Wave Driven High Frequency Waves in the Solar Atmosphere: Implications for Ion Heating
1 figure
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null
null
astro-ph.SR physics.space-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This work is an extension of Kaghashvili [1999] where ion-cyclotron wave dissipation channel for Alfv\'en waves was discussed. While our earlier study dealt with the mode coupling in the commonly discussed sense, here we study changes in the initial waveform due to interaction of the initial driver Alfv\'en wave and the plasma inhomogeneity, which are implicitly present in the equations, but were not elaborated in Kaghashvili [1999]. Using a cold plasma approximation, we show how high frequency waves (higher than the initial driver Alfv\'en wave frequency) are generated in the inhomogeneous solar plasma flow. The generation of the high frequency forward and backward propagating modified fast magnetosonic/whistler waves as well as the generation of the driven Alfv\'en waves is discussed in the solar atmosphere. The generated high frequency waves have a shorter dissipation timescale, and they can also resonant interact with particles using both the normal cyclotron and anomalous cyclotron interaction channels. These waves can also be important in space, Earths magnetosphere, the ionosphere, and laboratory plasma processes.
[ { "created": "Thu, 6 Feb 2014 22:32:41 GMT", "version": "v1" } ]
2014-02-10
[ [ "Kaghashvili", "Edisher Kh.", "" ] ]
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1402.1519
Somsubhra Barik
Somsubhra Barik and Haris Vikalo
Sparsity-aware sphere decoding: Algorithms and complexity analysis
Submitted to IEEE Transactions on Signal Processing
null
10.1109/TSP.2014.2307836
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Integer least-squares problems, concerned with solving a system of equations where the components of the unknown vector are integer-valued, arise in a wide range of applications. In many scenarios the unknown vector is sparse, i.e., a large fraction of its entries are zero. Examples include applications in wireless communications, digital fingerprinting, and array-comparative genomic hybridization systems. Sphere decoding, commonly used for solving integer least-squares problems, can utilize the knowledge about sparsity of the unknown vector to perform computationally efficient search for the solution. In this paper, we formulate and analyze the sparsity-aware sphere decoding algorithm that imposes $\ell_0$-norm constraint on the admissible solution. Analytical expressions for the expected complexity of the algorithm for alphabets typical of sparse channel estimation and source allocation applications are derived and validated through extensive simulations. The results demonstrate superior performance and speed of sparsity-aware sphere decoder compared to the conventional sparsity-unaware sphere decoding algorithm. Moreover, variance of the complexity of the sparsity-aware sphere decoding algorithm for binary alphabets is derived. The search space of the proposed algorithm can be further reduced by imposing lower bounds on the value of the objective function. The algorithm is modified to allow for such a lower bounding technique and simulations illustrating efficacy of the method are presented. Performance of the algorithm is demonstrated in an application to sparse channel estimation, where it is shown that sparsity-aware sphere decoder performs close to theoretical lower limits.
[ { "created": "Thu, 6 Feb 2014 22:39:12 GMT", "version": "v1" } ]
2015-06-18
[ [ "Barik", "Somsubhra", "" ], [ "Vikalo", "Haris", "" ] ]
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1402.1523
Val\'erio Ramos Batista
Antonio Elias Fabris, Marcelo Zanchetta do Nascimento, Val\'erio Ramos Batista
Programming plantation lines on driverless tractors
null
null
null
null
cs.CE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Recent advances in Agricultural Engineering include image processing, robotics and geographic information systems (GIS). Some tasks are still accomplished manually, like drawing plantation lines that optimize productivity. Herewith we present an algorithm to find the optimal plantation lines in linear time. The algorithm is based upon classical results of Geometry which enabled a source code with only 573 lines. We have implemented it in Matlab for sugar cane, and it can be easily adapted to other crops like coffee, maize and soy.
[ { "created": "Thu, 6 Feb 2014 23:14:58 GMT", "version": "v1" } ]
2014-02-10
[ [ "Fabris", "Antonio Elias", "" ], [ "Nascimento", "Marcelo Zanchetta do", "" ], [ "Batista", "Valério Ramos", "" ] ]
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1402.1526
Justin Hsu
Marco Gaboardi, Emilio Jes\'us Gallego Arias, Justin Hsu, Aaron Roth, Zhiwei Steven Wu
Dual Query: Practical Private Query Release for High Dimensional Data
null
Journal of Privacy and Confidentiality 7(2) 53--77 (2017)
null
null
cs.DS cs.CR cs.DB cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a practical, differentially private algorithm for answering a large number of queries on high dimensional datasets. Like all algorithms for this task, ours necessarily has worst-case complexity exponential in the dimension of the data. However, our algorithm packages the computationally hard step into a concisely defined integer program, which can be solved non-privately using standard solvers. We prove accuracy and privacy theorems for our algorithm, and then demonstrate experimentally that our algorithm performs well in practice. For example, our algorithm can efficiently and accurately answer millions of queries on the Netflix dataset, which has over 17,000 attributes; this is an improvement on the state of the art by multiple orders of magnitude.
[ { "created": "Thu, 6 Feb 2014 23:20:43 GMT", "version": "v1" }, { "created": "Thu, 19 Nov 2015 04:36:00 GMT", "version": "v2" } ]
2018-03-16
[ [ "Gaboardi", "Marco", "" ], [ "Arias", "Emilio Jesús Gallego", "" ], [ "Hsu", "Justin", "" ], [ "Roth", "Aaron", "" ], [ "Wu", "Zhiwei Steven", "" ] ]
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1402.1527
Michele Tamagnone
Michele Tamagnone and Julien Perruisseau-Carrier
Predicting input impedance and efficiency of graphene reconfigurable dipoles using a simple circuit model
4 pages, 4 figures. Accepted in IEEE Antenna and Wireless Propagation Letters
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10.1109/LAWP.2014.2305400
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
An analytical circuit model able to predict the input impedance of reconfigurable graphene plasmonic dipoles is presented. A suitable definition of plasmonic characteristic impedance, employing natural currents, is used to for consistent modeling of the antenna-load connection in the circuit. In its purely analytical form, the model shows good agreement with full-wave simulations, and explains the remarkable tuning properties of graphene antennas. Furthermore, using a single full-wave simulation and scaling laws, additional parasitic elements can be determined for a vast parametric space, leading to very accurate modeling. Finally, we also show that the modeling approach allows fair estimation of radiation efficiency as well. The approach also applies to thin plasmonic antennas realized using noble metals or semiconductors.
[ { "created": "Thu, 6 Feb 2014 23:25:00 GMT", "version": "v1" } ]
2015-06-18
[ [ "Tamagnone", "Michele", "" ], [ "Perruisseau-Carrier", "Julien", "" ] ]
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1402.1530
Marco Compagnoni
Marco Compagnoni, Roberto Notari
TDOA--based localization in two dimensions: the bifurcation curve
11 pages, 3 figures, to appear in Fundamenta Informaticae
Fundamenta Informaticae XXI (2014) 1001-1012
10.3233/FI-2014-1118
null
cs.SD gr-qc math.AC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we complete the study of the geometry of the TDOA map that encodes the noiseless model for the localization of a source from the range differences between three receivers in a plane, by computing the Cartesian equation of the bifurcation curve in terms of the positions of the receivers. From that equation, we can compute its real asymptotic lines. The present manuscript completes the analysis of [Inverse Problems, Vol. 30, Number 3, Pages 035004]. Our result is useful to check if a source belongs or is closed to the bifurcation curve, where the localization in a noisy scenario is ambiguous.
[ { "created": "Thu, 6 Feb 2014 23:43:28 GMT", "version": "v1" } ]
2016-04-07
[ [ "Compagnoni", "Marco", "" ], [ "Notari", "Roberto", "" ] ]
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1402.1533
Holger Flechsig
Holger Flechsig
Nucleotide-induced conformational motions and transmembrane gating dynamics in a bacterial ABC transporter
11 pages, 4 figures
null
null
null
q-bio.BM cond-mat.soft physics.bio-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
ATP-binding cassette (ABC) transporters are integral membrane proteins that mediate the exchange of diverse substrates across membranes powered by ATP hydrolysis. We report results of coarse-grained dynamical simulations performed for the bacterial heme transporter HmuUV. Based on the nucleotide-free structure, we have constructed a ligand-elastic-network description for this protein and investigated ATP-induced conformational motions in structurally resolved computer experiments. As we found, interactions with nucleotides resulted in generic motions which are functional and robust. Upon binding of ATP-mimicking ligands the structure changed from a conformation in which the nucleotide-binding domains formed an open shape, to a conformation in which they were found in tight contact and the transmembrane domains were rotated. The heme channel was broadened in the ligand-bound complex and the gate to the cytoplasm, which was closed in the nucleotide-free conformation, was rendered open by a mechanism that involved tilting motions of essential transmembrane helices. Based on our findings we propose that the HmuUV transporter behaves like a `simple' mechanical device in which, induced by binding of ATP ligands, linear motions of the nucleotide-binding domains are translated into rotational motions and internal tilting dynamics of the transmembrane domains that control gating inside the heme pathway.
[ { "created": "Fri, 7 Feb 2014 00:52:53 GMT", "version": "v1" } ]
2014-02-10
[ [ "Flechsig", "Holger", "" ] ]
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1402.1535
Ricardo Fernandes
R. Q. A Fernandes, and E. H. Haeusler, and L. C. P. D Pereira
PUC-Logic
33 pages, 1 figure
null
null
null
cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a logic for Proximity-based Understanding of Conditionals (PUC-Logic) that unifies the Counterfactual and Deontic logics proposed by David Lewis. We also propose a natural deduction system (PUC-ND) associated to this new logic. This inference system is proven to be sound, complete, normalizing and decidable. The relative completeness for the $\boldsymbol{V}$ and $\boldsymbol{CO}$ logics is shown to emphasize the unified approach over the work of Lewis.
[ { "created": "Fri, 7 Feb 2014 01:32:30 GMT", "version": "v1" } ]
2014-02-10
[ [ "Fernandes", "R. Q. A", "" ], [ "Haeusler", "E. H.", "" ], [ "Pereira", "L. C. P. D", "" ] ]
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1402.1544
Neelesh Patankar
Rahul Bale, Anup A. Shirgaonkar, Izaak D. Neveln, Amneet Pal Singh Bhalla, Malcolm A. MacIver, and Neelesh A. Patankar
Separability of drag and thrust in undulatory animals and machines
41 pages, 13 figures, 4 tables
Sci. Rep. 4 , 7329, 2014
10.1038/srep07329
null
physics.flu-dyn physics.bio-ph q-bio.QM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
For nearly a century, researchers have tried to understand the swimming of aquatic animals in terms of a balance between the forward thrust from swimming movements and drag on the body. Prior approaches have failed to provide a separation of these two forces for undulatory swimmers such as lamprey and eels, where most parts of the body are simultaneously generating drag and thrust. We nonetheless show that this separation is possible, and delineate its fundamental basis in undulatory swimmers. Our approach unifies a vast diversity of undulatory aquatic animals (anguilliform, sub-carangiform, gymnotiform, bal- istiform, rajiform) and provides design principles for highly agile bioinspired underwater vehicles. This approach has practical utility within biology as well as engineering. It is a predictive tool for use in understanding the role of the mechanics of movement in the evolutionary emergence of morphological features relating to locomotion. For example, we demonstrate that the drag-thrust separation framework helps to predict the observed height of the ribbon fin of electric knifefish, a diverse group of neotropical fishes which are an important model system in sensory neurobiology. We also show how drag-thrust separation leads to models that can predict the swimming velocity of an organism or a robotic vehicle.
[ { "created": "Fri, 7 Feb 2014 02:56:36 GMT", "version": "v1" } ]
2015-02-04
[ [ "Bale", "Rahul", "" ], [ "Shirgaonkar", "Anup A.", "" ], [ "Neveln", "Izaak D.", "" ], [ "Bhalla", "Amneet Pal Singh", "" ], [ "MacIver", "Malcolm A.", "" ], [ "Patankar", "Neelesh A.", "" ] ]
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1402.1545
Carol Niznik
Dr. Carol A. Niznik
The Tactical Optimal Strategy Game (TOSG) Protocol Cockpit Software Control For Massive Ordnance Penetrator Release
e-ISSN: 2251-7545
The International Journal of Soft Computing and Software Engineering [JSCSE], Vol. 3, No. 3, 2013, pp.474-480
10.7321/jscse.v3.n3.72
null
cs.CY cs.GT
http://creativecommons.org/licenses/publicdomain/
The Massive Ordnance Penetrator(MOP) has been developed to destroy deeply buried nuclear components by controlled release from a B2 or B52 airplane. This type of release must be cockpit software controlled by the Tactical Optimal Strategy Game(TOSG) Protocol to optimally determine the war game aspects of the dueling from other countries' MOP releases, and the depth at which the MOP explosions can occur for maximal safety and risk concerns. The TOSG Protocol characteristics of games of strategy, games of optimal strategy and tactical games are defined initially by the game of strategy as a certain series of events, each of which must have a finite number of distinct results. The outcome of a game of strategy, in some cases, depends on chance. All other events depend on the free decision of the players. A game has a solution if there exist two strategies, which become optimal strategies when each mathematically attains the value of the game. The TOSG Protocol war game tactical problem for a class of games can be mathematically modeled as a combat between two airplanes, each carrying a MOP as the specification of the accuracy of the firing machinery and the total amount of ammunition that each plane carries. This silent duel occurs, because each MOP bomber is unable to determine the number of times its opponent has missed. The TOSG Protocol realizes a game theory solution of the tactical optimal strategy game utilizing the theory of games of timing, games of pursuit, games of time lag, games of sequence, games of maneuvering, games of search, games of positioning and games of aiming and evasion.
[ { "created": "Fri, 7 Feb 2014 03:22:19 GMT", "version": "v1" } ]
2014-02-10
[ [ "Niznik", "Dr. Carol A.", "" ] ]
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1402.1546
Weiwei Sun
Renchu Song, Weiwei Sun, Baihua Zheng, Yu Zheng
PRESS: A Novel Framework of Trajectory Compression in Road Networks
27 pages, 17 figures
null
null
null
cs.DB
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Location data becomes more and more important. In this paper, we focus on the trajectory data, and propose a new framework, namely PRESS (Paralleled Road-Network-Based Trajectory Compression), to effectively compress trajectory data under road network constraints. Different from existing work, PRESS proposes a novel representation for trajectories to separate the spatial representation of a trajectory from the temporal representation, and proposes a Hybrid Spatial Compression (HSC) algorithm and error Bounded Temporal Compression (BTC) algorithm to compress the spatial and temporal information of trajectories respectively. PRESS also supports common spatial-temporal queries without fully decompressing the data. Through an extensive experimental study on real trajectory dataset, PRESS significantly outperforms existing approaches in terms of saving storage cost of trajectory data with bounded errors.
[ { "created": "Fri, 7 Feb 2014 03:29:08 GMT", "version": "v1" } ]
2014-02-10
[ [ "Song", "Renchu", "" ], [ "Sun", "Weiwei", "" ], [ "Zheng", "Baihua", "" ], [ "Zheng", "Yu", "" ] ]
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1402.1552
Jae Woo Lee
Ashadun Nobi, Sungmin Lee, Doo Hwan Kim, and Jae Woo Lee
Correlation and Network Topologies in Global and Local Stock Indices
11 pages,4 figures
null
10.1016/j.physleta.2014.07.009
null
q-fin.ST physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This study examined how the correlation and network structure of 30 global indices and 145 local Korean indices belonging to the KOSPI 200 have changed during the 13-year period, 2000-2012. The correlations among the indices were calculated. The results showed that although the average correlations of the global indices increased with time, the local indices showed a decreasing trend except for drastic changes during crises. The average correlation of the local indices exceeded the global indices during the crises from 2000-2002, implying a strong correlation structure among the local indices during this period due to the detrimental effect of the dot-com bubble. The threshold networks (TN) were constructed in the observation time window by assigning a threshold value and determining the network topologies. A significant change in the network topologies was observed due to the financial crises in both markets. The Jaccard similarities were also determined using the common links of TNs. The TNs of the financial network were not consistent with the evolution of the time, and the successive TNs of the global indices were more similar than those of the successive local indices. Finally, the Jaccard similarities identified the change in the market state due to a crisis in both markets.
[ { "created": "Fri, 7 Feb 2014 05:19:01 GMT", "version": "v1" } ]
2015-06-18
[ [ "Nobi", "Ashadun", "" ], [ "Lee", "Sungmin", "" ], [ "Kim", "Doo Hwan", "" ], [ "Lee", "Jae Woo", "" ] ]
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1402.1555
Alessandro Toffoli
Alessandro Toffoli, Alberto Alberello, Luke G. Bennetts, Michael H. Meylan, Claudio Cavaliere, Alexandr Babanin
An experimental model of reflection and transmission of ocean waves by an ice floe
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physics.flu-dyn physics.ao-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
An experimental model of reflection and transmission of ocean waves by an ice floe is presented. Evolution of mechanically-generated, regular waves is monitored in front and in the lee of a solitary, square floe, made of a synthetic material. Results confirm dependence of reflection and transmission on the period of the incident wave. Results also indicate that wave overwash on the floe affects reflection and transmission.
[ { "created": "Fri, 7 Feb 2014 05:38:09 GMT", "version": "v1" }, { "created": "Tue, 25 Mar 2014 07:08:01 GMT", "version": "v2" }, { "created": "Thu, 26 Jun 2014 06:31:50 GMT", "version": "v3" } ]
2014-06-27
[ [ "Toffoli", "Alessandro", "" ], [ "Alberello", "Alberto", "" ], [ "Bennetts", "Luke G.", "" ], [ "Meylan", "Michael H.", "" ], [ "Cavaliere", "Claudio", "" ], [ "Babanin", "Alexandr", "" ] ]
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1402.1557
Xinchen Zhang
Xinchen Zhang and Martin Haenggi
The Performance of Successive Interference Cancellation in Random Wireless Networks
null
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper provides a unified framework to study the performance of successive interference cancellation (SIC) in wireless networks with arbitrary fading distribution and power-law path loss. An analytical characterization of the performance of SIC is given as a function of different system parameters. The results suggest that the marginal benefit of enabling the receiver to successively decode k users diminishes very fast with k, especially in networks of high dimensions and small path loss exponent. On the other hand, SIC is highly beneficial when the users are clustered around the receiver and/or very low-rate codes are used. Also, with multiple packet reception, a lower per-user information rate always results in higher aggregate throughput in interference-limited networks. In contrast, there exists a positive optimal per-user rate that maximizes the aggregate throughput in noisy networks. The analytical results serve as useful tools to understand the potential gain of SIC in heterogeneous cellular networks (HCNs). Using these tools, this paper quantifies the gain of SIC on the coverage probability in HCNs with non-accessible base stations. An interesting observation is that, for contemporary narrow-band systems (e.g., LTE and WiFi), most of the gain of SIC is achieved by canceling a single interferer.
[ { "created": "Fri, 7 Feb 2014 05:59:43 GMT", "version": "v1" } ]
2014-02-10
[ [ "Zhang", "Xinchen", "" ], [ "Haenggi", "Martin", "" ] ]
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1402.1563
J\"urgen M\"unch
Ansgar Lamersdorf, J\"urgen M\"unch, Dieter Rombach
Towards a Multi-criteria Development Distribution Model: An Analysis of Existing Task Distribution Approaches
10 pages. The final publication is available at http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4638658
IEEE International Conference on Global Software Engineering (ICGSE 2008), pages 109-118, 2008
10.1109/ICGSE.2008.15
null
cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Distributing development tasks in the context of global software development bears both many risks and many opportunities. Nowadays, distributed development is often driven by only a few factors or even just a single factor such as workforce costs. Risks and other relevant factors such as workforce capabilities, the innovation potential of different regions, or cultural factors are often not recognized sufficiently. This could be improved by using empirically-based multi-criteria distribution models. Currently, there is a lack of such decision models for distributing software development work. This article focuses on mechanisms for such decision support. First, requirements for a distribution model are formulated based on needs identified from practice. Then, distribution models from different domains are surveyed, compared, and analyzed in terms of suitability. Finally, research questions and directions for future work are given.
[ { "created": "Fri, 7 Feb 2014 07:16:12 GMT", "version": "v1" } ]
2014-02-10
[ [ "Lamersdorf", "Ansgar", "" ], [ "Münch", "Jürgen", "" ], [ "Rombach", "Dieter", "" ] ]
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1402.1565
Dr. Georgios M. Nikolopoulos
G. M. Nikolopoulos and P. Lambropoulos
Multiple Ionization of Neon under soft x-rays: Theory vs Experiment
null
J. Phys. B: At. Mol. Opt. Phys. 47 (2014) 115001
10.1088/0953-4075/47/11/115001
null
physics.atom-ph quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a rather elaborate theoretical model describing the dynamics of Neon under radiation of photon energies $\sim 93$ eV and pulse duration in the range of 15 fs, within the framework of Lowest non-vanishing Order of Perturbation Theory (LOPT), cast in terms of rate equations. Our model includes sequential as well as direct multiple ionization channels from the 2s and 2p atomic shells, including aspects of fine structure, whereas the stochastic nature of SASE-FEL light pulses is also taken into account. Our predictions for the ionization yields of the different ionic species are in excellent agreement with the related experimental observations at FLASH.
[ { "created": "Fri, 7 Feb 2014 07:38:32 GMT", "version": "v1" } ]
2015-06-18
[ [ "Nikolopoulos", "G. M.", "" ], [ "Lambropoulos", "P.", "" ] ]
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1402.1572
Martina Cardone
Martina Cardone, Daniela Tuninetti, Raymond Knopp, Umer Salim
New Outer Bounds for the Interference Channel with Unilateral Source Cooperation
Submitted to IEEE International Symposium on Information Theory (ISIT) 2014
null
10.1109/ISIT.2014.6875068
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper studies the two-user interference channel with unilateral source cooperation, which consists of two source-destination pairs that share the same channel and where one full-duplex source can overhear the other source through a noisy in-band link. Novel outer bounds of the type 2Rp+Rc/Rp+2Rc are developed for the class of injective semi-deterministic channels with independent noises at the different source-destination pairs. The bounds are then specialized to the Gaussian noise case. Interesting insights are provided about when these types of bounds are active, or in other words, when unilateral cooperation is too weak and leaves "holes" in the system resources.
[ { "created": "Fri, 7 Feb 2014 08:56:58 GMT", "version": "v1" } ]
2016-11-17
[ [ "Cardone", "Martina", "" ], [ "Tuninetti", "Daniela", "" ], [ "Knopp", "Raymond", "" ], [ "Salim", "Umer", "" ] ]
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