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1402.6833
Aleksey Polubotko
V.P. Chelibanov, A.M. Polubotko
Electrodynamical Forbiddance of Strong Quadrupole Light-Molecule Interaction in the Methane Molecule and its Manifestation in Surface Enhanced Hyper Raman Scattering Spectra
12 pages
null
null
null
physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
It is demonstrated in the framework of the Dipole-Quadrupole theory, that strong quadrupole light-molecule interaction, which is responsible for the most enhancement of SEHRS in the methane molecule, which belongs to the symmetry group, experiences so-called electrodynamical forbiddance due to electrodynamical law, and does not influence on the formation of the SEHRS spectra. This forbiddance results in the fact that the lines, caused by the totally symmetric vibrations, transforming after the unit irreducible representation, which are observed in symmetrical molecules with another sufficiently high groups of the point symmetry, such as pyrazine and phenazine, with symmetry group, must be slight, or be absent at all. In this case in methane the most enhanced lines are those, caused by vibrations, transforming by the irreducible representation, or .
[ { "created": "Thu, 27 Feb 2014 09:20:04 GMT", "version": "v1" } ]
2014-02-28
[ [ "Chelibanov", "V. P.", "" ], [ "Polubotko", "A. M.", "" ] ]
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1402.6835
Hiroshi Saito
Hiroshi Saito
Spatial Design of Physical Network Robust against Earthquakes
arXiv admin note: text overlap with arXiv:1312.7187
null
10.1109/JLT.2014.2385100
null
cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper analyzes the survivability of a physical network against earthquakes and proposes spatial network design rules to make a network robust against earthquakes. The disaster area model used is fairly generic and bounded. The proposed design rules for physical networks include: (i) a shorter zigzag route can reduce the probability that a network intersects a disaster area, (ii) an additive performance metric, such as repair cost, is independent of the network shape if the route length is fixed, and (iii) additional routes within a ring network does not decrease the probability that all the routes between a given pair of nodes intersect the disaster area, but a wider detour route decreases it. Formulas for evaluating the probability of disconnecting two given nodes are also derived. An optimal server placement is shown as an application of the theoretical results. These analysis results are validated through empirical earthquake data.
[ { "created": "Thu, 27 Feb 2014 09:23:09 GMT", "version": "v1" } ]
2015-06-18
[ [ "Saito", "Hiroshi", "" ] ]
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1402.6837
Navinder Singh
Navinder Singh
Thermodynamical Phase transitions, the mean-field theories, and the renormalization (semi)group: A pedagogical introduction
30 Pages, 19 figures
null
null
null
cond-mat.stat-mech physics.hist-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
While analyzing second order thermodynamical phase transitions, Lev Landau (the famous Russian physicist) introduced a very vital concept, the concept of an "order parameter". This not only amalgamated the previous fragmentary theoretical understanding of phase transitions (an arsenal of mean-field theories) but also it put forward the important theory of "spontaneous symmetry breaking". Today, order parameter concept is a paradigm both in condensed matter physics and in high energy physics, and Landau theory is a pinnacle of all mean-field theories. Mean field theories are good qualitative descriptors of the phase transition behavior. But all mean-field theories (including Landau's theory) fail at the critical point (the problem of large correlation length). The problems with large correlation length in quantum many-body systems are the hardest problems known in theoretical physics (both in condensed matter and in particle physics). It was Ken Wilson's physical insights and his powerful mathematical skills that opened a way to the solution of such hard problems. This manuscript is a perspective on these issues. Starting with simple examples of phase transitions (like ice/water; diamond/graphite etc.) we address the following important questions: Why does non-analyticity (sharp phase transitions) arise when thermodynamical functions (i.e., free energies etc) are good analytic functions? How does Landau's program unify all the previous mean-field theories? Why do all the mean-field theories fail near the critical point? How does Wilson's program go beyond all the mean-field theories? What is the origin emergence and universality?
[ { "created": "Thu, 27 Feb 2014 09:43:45 GMT", "version": "v1" } ]
2014-02-28
[ [ "Singh", "Navinder", "" ] ]
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1402.6840
Pawe{\l} Kowalski
P. Kowalski, L. Raczy\'nski, T. Bednarski, P. Bia{\l}as, E. Czerwi\'nski, K. Giergiel, {\L}. Kap{\l}on, A. Kochanowski, G. Korcyl, J. Kowal, T. Kozik, W. Krzemie\'n, M. Molenda, I. Moskal, P. Moskal, Sz. Nied\'zwiecki, M. Pa{\l}ka, M. Pawlik-Nied\'zwiecka, Z. Rudy, P. Salabura, N.G. Sharma, M. Silarski, A. S{\l}omski, J. Smyrski, A. Strzelecki, K. Szyma\'nski, W. Wi\'slicki, P. Witkowski, M. Zieli\'nski, N. Zo\'n
Determination of the map of efficiency of the J-PET detector with the GATE package
14 pages, 9 figures, proceeding from conference Symposium on Positron Emission Tomography: http://koza.if.uj.edu.pl/pet-symposium-2013/
Bio-Algorithms and Med-Systems 10(2), 85-90 (2014)
10.1515/bams-2014-0002
null
physics.ins-det
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A novel PET detector consisting of strips of polymer scintillators is being developed by the J-PET Collaboration. The map of efficiency and the map of geometrical acceptance of the 2-strip J-PET scanner are presented. Map of efficiency was determined using the Monte Carlo simulation software GATE based on GEANT4. Both maps were compared using method based on the chi2 test.
[ { "created": "Thu, 27 Feb 2014 09:57:40 GMT", "version": "v1" } ]
2014-08-19
[ [ "Kowalski", "P.", "" ], [ "Raczyński", "L.", "" ], [ "Bednarski", "T.", "" ], [ "Białas", "P.", "" ], [ "Czerwiński", "E.", "" ], [ "Giergiel", "K.", "" ], [ "Kapłon", "Ł.", "" ], [ "Kochanowski", "A.", "" ], [ "Korcyl", "G.", "" ], [ "Kowal", "J.", "" ], [ "Kozik", "T.", "" ], [ "Krzemień", "W.", "" ], [ "Molenda", "M.", "" ], [ "Moskal", "I.", "" ], [ "Moskal", "P.", "" ], [ "Niedźwiecki", "Sz.", "" ], [ "Pałka", "M.", "" ], [ "Pawlik-Niedźwiecka", "M.", "" ], [ "Rudy", "Z.", "" ], [ "Salabura", "P.", "" ], [ "Sharma", "N. G.", "" ], [ "Silarski", "M.", "" ], [ "Słomski", "A.", "" ], [ "Smyrski", "J.", "" ], [ "Strzelecki", "A.", "" ], [ "Szymański", "K.", "" ], [ "Wiślicki", "W.", "" ], [ "Witkowski", "P.", "" ], [ "Zieliński", "M.", "" ], [ "Zoń", "N.", "" ] ]
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1402.6851
Lailai Zhu Mr.
Lailai Zhu (KTH, Mechanics and EPFL, LFMI) Cecilia Rorai (NORDITA, KTH, Mechanics), Dhrubaditya Mitra (NORDITA), and Luca Brandt (KTH, Mechanics)
A microfluidic device to sort capsules by deformability: A numerical study
preprint, 7 pages 6 figures
Soft matter, 2014, 10, 7705-7711
10.1039/C4SM01097C
NORDITA-2014-22
physics.flu-dyn physics.bio-ph physics.comp-ph physics.med-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Guided by extensive numerical simulations, we propose a microfluidic device that can sort elastic capsules by their deformability. The device consists of a duct embedded with a semi-cylindrical obstacle, and a diffuser which further enhances the sorting capability. We demonstrate that the device can operate reasonably well under changes in the initial position of the the capsule. The efficiency of the device remains essentially unaltered under small changes of the obstacle shape (from semi-circular to semi-elliptic cross-section). Confinement along the direction perpendicular to the plane of the device increases its efficiency. This work is the first numerical study of cell sorting by a realistic microfluidic device.
[ { "created": "Thu, 27 Feb 2014 10:22:39 GMT", "version": "v1" }, { "created": "Sun, 15 Jun 2014 19:25:13 GMT", "version": "v2" }, { "created": "Sun, 22 Jun 2014 12:25:58 GMT", "version": "v3" }, { "created": "Wed, 25 Jun 2014 08:58:52 GMT", "version": "v4" } ]
2014-09-18
[ [ "Zhu", "Lailai", "", "KTH, Mechanics and EPFL, LFMI" ], [ "Rorai", "Cecilia", "", "NORDITA,\n KTH, Mechanics" ], [ "Mitra", "Dhrubaditya", "", "NORDITA" ], [ "Brandt", "Luca", "", "KTH,\n Mechanics" ] ]
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1402.6853
Florian Trinter
L. Ph. H. Schmidt, C. Goihl, D. Metz, H. Schmidt-B\"ocking, R. D\"orner, S. Yu. Ovchinnikov, J. H. Macek, and D. R. Schultz
Vortices associated with the wave function of a single electron emitted in slow ion-atom collisions
null
Physical Review Letters 112, 083201 (2014)
10.1103/PhysRevLett.112.083201
null
physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present measurements and calculations of the momentum distribution of electrons emitted during the ion-atom collision 10 keV/u $He^{2+}+He \rightarrow He^{+} + He^{2+} + e^{-}$, which show rich structures for ion scattering angles above 2 mrad arising dominantly from two-electron states. Our calculations reveal that minima in the measured distributions are zeros in the electronic probability density resulting from vortices in the electronic current.
[ { "created": "Thu, 27 Feb 2014 10:25:45 GMT", "version": "v1" } ]
2014-02-28
[ [ "Schmidt", "L. Ph. H.", "" ], [ "Goihl", "C.", "" ], [ "Metz", "D.", "" ], [ "Schmidt-Böcking", "H.", "" ], [ "Dörner", "R.", "" ], [ "Ovchinnikov", "S. Yu.", "" ], [ "Macek", "J. H.", "" ], [ "Schultz", "D. R.", "" ] ]
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1402.6859
Ahmed Ibrahim Taloba
M. H. Marghny, Ahmed I. Taloba
Outlier Detection using Improved Genetic K-means
null
null
null
null
cs.LG cs.DB
http://creativecommons.org/licenses/by-nc-sa/3.0/
The outlier detection problem in some cases is similar to the classification problem. For example, the main concern of clustering-based outlier detection algorithms is to find clusters and outliers, which are often regarded as noise that should be removed in order to make more reliable clustering. In this article, we present an algorithm that provides outlier detection and data clustering simultaneously. The algorithmimprovesthe estimation of centroids of the generative distribution during the process of clustering and outlier discovery. The proposed algorithm consists of two stages. The first stage consists of improved genetic k-means algorithm (IGK) process, while the second stage iteratively removes the vectors which are far from their cluster centroids.
[ { "created": "Thu, 27 Feb 2014 11:07:00 GMT", "version": "v1" } ]
2014-05-25
[ [ "Marghny", "M. H.", "" ], [ "Taloba", "Ahmed I.", "" ] ]
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1402.6862
Mohammad Reza Keshtkaran
Mohammad Reza Keshtkaran and Zhi Yang
A Fast, robust algorithm for power line interference cancellation in neural recording
18 pages, 21 figures, to appear in Journal of Neural Engineering
M. R. Keshtkaran and Z. Yang, "A fast, robust algorithm for power line interference cancellation in neural recording," J. Neural Eng., vol. 11, no. 2, p. 026017, Apr. 2014
10.1088/1741-2560/11/2/026017
null
cs.SY physics.med-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Power line interference may severely corrupt neural recordings at 50/60 Hz and harmonic frequencies. In this paper, we present a robust and computationally efficient algorithm for removing power line interference from neural recordings. The algorithm includes four steps. First, an adaptive notch filter is used to estimate the fundamental frequency of the interference. Subsequently, based on the estimated frequency, harmonics are generated by using discrete-time oscillators, and then the amplitude and phase of each harmonic are estimated through using a modified recursive least squares algorithm. Finally, the estimated interference is subtracted from the recorded data. The algorithm does not require any reference signal, and can track the frequency, phase, and amplitude of each harmonic. When benchmarked with other popular approaches, our algorithm performs better in terms of noise immunity, convergence speed, and output signal-to-noise ratio (SNR). While minimally affecting the signal bands of interest, the algorithm consistently yields fast convergence and substantial interference rejection in different conditions of interference strengths (input SNR from -30 dB to 30 dB), power line frequencies (45-65 Hz), and phase and amplitude drifts. In addition, the algorithm features a straightforward parameter adjustment since the parameters are independent of the input SNR, input signal power, and the sampling rate. The proposed algorithm features a highly robust operation, fast adaptation to interference variations, significant SNR improvement, low computational complexity and memory requirement, and straightforward parameter adjustment. These features render the algorithm suitable for wearable and implantable sensor applications, where reliable and real-time cancellation of the interference is desired.
[ { "created": "Thu, 27 Feb 2014 11:27:17 GMT", "version": "v1" }, { "created": "Mon, 24 Mar 2014 13:03:10 GMT", "version": "v2" } ]
2014-03-25
[ [ "Keshtkaran", "Mohammad Reza", "" ], [ "Yang", "Zhi", "" ] ]
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1402.6865
J\'er\^ome Kunegis
J\'er\^ome Kunegis
Applications of Structural Balance in Signed Social Networks
37 pages
null
null
null
cs.SI physics.soc-ph
http://creativecommons.org/licenses/by/3.0/
We present measures, models and link prediction algorithms based on the structural balance in signed social networks. Certain social networks contain, in addition to the usual 'friend' links, 'enemy' links. These networks are called signed social networks. A classical and major concept for signed social networks is that of structural balance, i.e., the tendency of triangles to be 'balanced' towards including an even number of negative edges, such as friend-friend-friend and friend-enemy-enemy triangles. In this article, we introduce several new signed network analysis methods that exploit structural balance for measuring partial balance, for finding communities of people based on balance, for drawing signed social networks, and for solving the problem of link prediction. Notably, the introduced methods are based on the signed graph Laplacian and on the concept of signed resistance distances. We evaluate our methods on a collection of four signed social network datasets.
[ { "created": "Thu, 27 Feb 2014 11:32:50 GMT", "version": "v1" } ]
2014-02-28
[ [ "Kunegis", "Jérôme", "" ] ]
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1402.6871
Xia Dongmei
Xia DongMei and Yu BoXiang and Li XiaoBo and Sun XiLei and Ding YaYun and Zhou Li and Cao Jun and Hu Wei and Ye XingCheng and Chen HaiTao and Ding XueFeng and Du Bing
Temperature dependence of the light yield of the LAB-based and mesitylene-based liquid scintillators
null
null
null
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physics.ins-det hep-ex
http://creativecommons.org/licenses/publicdomain/
We studied the temperature dependence of the light yield of the linear alkyl benzene (LAB)-based and mesitylene-based liquid scintillators. The light yield increases by 23% for both liquid scintillators when the temperature is lowered from $26\;^{\circ}$C to $-40\;^{\circ }$C, correcting for the temperature response of the photomultiplier tube. The measurements help to understand the energy response of the liquid scintillator detectors. Especially, the next generation reactor neutrino experiments for neutrino mass hierarchy, such as the Jiangmen Underground Neutrino Observatory (JUNO), require very high energy resolution. As no apparent degradation on the liquid scintillator transparency was observed, lowering the operation temperature of the detector to $\sim4\;^\circ$C will increase the photoelectron yield of the detector by 13%, combining the light yield increase of the liquid scintillator and the quantum efficiency increase of the photomultiplier tubes.
[ { "created": "Thu, 27 Feb 2014 11:49:37 GMT", "version": "v1" } ]
2014-02-28
[ [ "DongMei", "Xia", "" ], [ "BoXiang", "Yu", "" ], [ "XiaoBo", "Li", "" ], [ "XiLei", "Sun", "" ], [ "YaYun", "Ding", "" ], [ "Li", "Zhou", "" ], [ "Jun", "Cao", "" ], [ "Wei", "Hu", "" ], [ "XingCheng", "Ye", "" ], [ "HaiTao", "Chen", "" ], [ "XueFeng", "Ding", "" ], [ "Bing", "Du", "" ] ]
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1402.6875
Miroslaw Brewczyk
Tomasz Karpiuk, Miros{\l}aw Brewczyk, Kazimierz Rz\k{a}\.zewski, Anita Gaj, Jonathan B. Balewski, Alexander T. Krupp, Michael Schlagm\"uller, Robert L\"ow, Sebastian Hofferberth, and Tilman Pfau
Imaging single Rydberg electrons in a Bose-Einstein condensate
New J. Phys., accepted
New J. Phys. 17 (2015) 053046
null
null
physics.atom-ph cond-mat.quant-gas quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The quantum mechanical states of electrons in atoms and molecules are distinct orbitals, which are fundamental for our understanding of atoms, molecules and solids. Electronic orbitals determine a wide range of basic atomic properties, allowing also for the explanation of many chemical processes. Here, we propose a novel technique to optically image the shape of electron orbitals of neutral atoms using electron-phonon coupling in a Bose-Einstein condensate. To validate our model we carefully analyze the impact of a single Rydberg electron onto a condensate and compare the results to experimental data. Our scheme requires only well-established experimental techniques that are readily available and allows for the direct capture of textbook-like spatial images of single electronic orbitals in a single shot experiment.
[ { "created": "Thu, 27 Feb 2014 11:56:32 GMT", "version": "v1" }, { "created": "Sat, 16 May 2015 15:56:17 GMT", "version": "v2" } ]
2015-05-29
[ [ "Karpiuk", "Tomasz", "" ], [ "Brewczyk", "Mirosław", "" ], [ "Rzążewski", "Kazimierz", "" ], [ "Gaj", "Anita", "" ], [ "Balewski", "Jonathan B.", "" ], [ "Krupp", "Alexander T.", "" ], [ "Schlagmüller", "Michael", "" ], [ "Löw", "Robert", "" ], [ "Hofferberth", "Sebastian", "" ], [ "Pfau", "Tilman", "" ] ]
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1402.6876
Li Dengjie
Li Dengjie
Cosmic Muon Induced Backgrounds in the Daya Bay Reactor Neutrino Experiment
4 pages,6 figures,conference
null
null
null
physics.ins-det hep-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Muon induced neutrons and long-lived radioactive isotopes are important background sources for low-energy underground experiments. We study the produced processes and properties of cosmic muon induced backgrounds, show the muon veto system used for rejecting these backgrounds and the methods to estimate residual backgrounds in the Daya Bay Reactor Neutrino Experiment.
[ { "created": "Thu, 27 Feb 2014 11:57:17 GMT", "version": "v1" } ]
2014-02-28
[ [ "Dengjie", "Li", "" ] ]
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1402.6878
Atsushi Mori
Atsushi Mori, Yoshihisa Suzuki, Masahide Sato
Gravitational tempering in colloidal epitaxy to reduce defects further
12 pages, 2 figures; submitted to Crystal Growth and Design
Crystal Growth & Design, Vol. 14, Issue 5, pp.2083-2086
10.1021/cg401884k
null
cond-mat.soft cond-mat.mtrl-sci physics.chem-ph physics.comp-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Less-defective colloidal crystals can be used as photonic crystals. To this end, colloidal epitaxy was proposed in 1997 as a method to reduce the stacking defects in the colloidal crystals. In this method, face-centered cubic (fcc) (001) stacking is forced by a template. In fcc (001) stacking, in contract to fcc {111} stacking, the stacking sequence is unique and thus the stacking fault can be avoided. Additionally, in 1997, an effect of gravity that reduces the stacking disorder in hard-sphere (HS) colloidal crystals was found. Recently, we have proposed a gravitational tempering method based on a result of Monte Carlo (MC) simulations using the HS model; after a colloidal crystal is grown in a relatively strong gravitational field, the defects can be reduced by decreasing the gravity strength and maintain for a period of time. Here, we demonstrate this method using MC simulations with a programed gravitation. The dramatic disappearance of defect structures is observed. Gravitational tempering can complement gravitational annealing; some defect structures that accidentally remain after gravitational annealing (keeping the colloidal crystal under gravity of a considerable constant strength) can be erased.
[ { "created": "Thu, 27 Feb 2014 11:59:33 GMT", "version": "v1" }, { "created": "Fri, 28 Feb 2014 03:59:00 GMT", "version": "v2" } ]
2014-05-09
[ [ "Mori", "Atsushi", "" ], [ "Suzuki", "Yoshihisa", "" ], [ "Sato", "Masahide", "" ] ]
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1402.6880
Mark Keane
M.T. Keane and A. Gerow
It's distributions all the way down!: Second order changes in statistical distributions also occur
null
Behavioral & Brain Sciences, 2014, 37(1), 87
10.1017/S0140525X13001763
null
cs.CL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The textual, big-data literature misses Bentley, OBrien, & Brocks (Bentley et als) message on distributions; it largely examines the first-order effects of how a single, signature distribution can predict population behaviour, neglecting second-order effects involving distributional shifts, either between signature distributions or within a given signature distribution. Indeed, Bentley et al. themselves under-emphasise the potential richness of the latter, within-distribution effects.
[ { "created": "Thu, 27 Feb 2014 12:12:11 GMT", "version": "v1" } ]
2019-08-19
[ [ "Keane", "M. T.", "" ], [ "Gerow", "A.", "" ] ]
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1402.6882
Lu Lu
Minglong Zhang and Lu Lu and Soung-Chang Liew
An Optimal Decoding Strategy for Physical-layer Network Coding over Multipath Fading Channels
Submitted to IEEE Transactions on Vehicular Technology
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present an optimal decoder for physical-layer network coding (PNC) in a multipath fading channels. Previous studies on PNC have largely focused on the single path case. For PNC, multipath not only introduces inter-symbol interference (ISI), but also cross-symbol interference (Cross-SI) between signals simultaneously transmitted by multiple users. In this paper, we assume the transmitters do not have channel state information (CSI). The relay in the PNC system, however, has CSI. The relay makes use of a belief propagation (BP) algorithm to decode the multipath-distorted signals received from multiple users into a network-coded packet. We refer to our multipath decoding algorithm as MP-PNC. Our simulation results show that, benchmarked against synchronous PNC over a one-path channel, the bit error rate (BER) performance penalty of MP-PNC under a two-tap ITU channel model can be kept within 0.5dB. Moreover, it outperforms a MUD-XOR algorithm by 3dB -- MUD-XOR decodes the individual information from both users explicitly before performing the XOR network-coding mapping. Although the framework of fading-channel PNC presented in this paper is demonstrated based on two-path and three-path channel models, our algorithm can be easily extended to cases with more than three paths.
[ { "created": "Thu, 27 Feb 2014 12:22:38 GMT", "version": "v1" }, { "created": "Tue, 8 Jul 2014 06:06:36 GMT", "version": "v2" } ]
2014-07-09
[ [ "Zhang", "Minglong", "" ], [ "Lu", "Lu", "" ], [ "Liew", "Soung-Chang", "" ] ]
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1402.6888
Adam Erskine
Adam Erskine, J Michael Herrmann
CriPS: Critical Dynamics in Particle Swarm Optimization
null
null
null
null
cs.NE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Particle Swarm Optimisation (PSO) makes use of a dynamical system for solving a search task. Instead of adding search biases in order to improve performance in certain problems, we aim to remove algorithm-induced scales by controlling the swarm with a mechanism that is scale-free except possibly for a suppression of scales beyond the system size. In this way a very promising performance is achieved due to the balance of large-scale exploration and local search. The resulting algorithm shows evidence for self-organised criticality, brought about via the intrinsic dynamics of the swarm as it interacts with the objective function, rather than being explicitly specified. The Critical Particle Swarm (CriPS) can be easily combined with many existing extensions such as chaotic exploration, additional force terms or non-trivial topologies.
[ { "created": "Thu, 27 Feb 2014 12:35:27 GMT", "version": "v1" } ]
2014-02-28
[ [ "Erskine", "Adam", "" ], [ "Herrmann", "J Michael", "" ] ]
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1402.6889
Broes De Cat
Broes De Cat, Marc Denecker, Peter Stuckey, Maurice Bruynooghe
Lazy Model Expansion: Interleaving Grounding with Search
null
Journal of Artificial Intelligence Research, feb 2015, volume 52, pages 235-286
null
null
cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Finding satisfying assignments for the variables involved in a set of constraints can be cast as a (bounded) model generation problem: search for (bounded) models of a theory in some logic. The state-of-the-art approach for bounded model generation for rich knowledge representation languages, like ASP, FO(.) and Zinc, is ground-and-solve: reduce the theory to a ground or propositional one and apply a search algorithm to the resulting theory. An important bottleneck is the blowup of the size of the theory caused by the reduction phase. Lazily grounding the theory during search is a way to overcome this bottleneck. We present a theoretical framework and an implementation in the context of the FO(.) knowledge representation language. Instead of grounding all parts of a theory, justifications are derived for some parts of it. Given a partial assignment for the grounded part of the theory and valid justifications for the formulas of the non-grounded part, the justifications provide a recipe to construct a complete assignment that satisfies the non-grounded part. When a justification for a particular formula becomes invalid during search, a new one is derived; if that fails, the formula is split in a part to be grounded and a part that can be justified. The theoretical framework captures existing approaches for tackling the grounding bottleneck such as lazy clause generation and grounding-on-the-fly, and presents a generalization of the 2-watched literal scheme. We present an algorithm for lazy model expansion and integrate it in a model generator for FO(ID), a language extending first-order logic with inductive definitions. The algorithm is implemented as part of the state-of-the-art FO(ID) Knowledge-Base System IDP. Experimental results illustrate the power and generality of the approach.
[ { "created": "Thu, 27 Feb 2014 12:35:41 GMT", "version": "v1" }, { "created": "Tue, 3 Feb 2015 20:08:25 GMT", "version": "v2" } ]
2015-02-04
[ [ "De Cat", "Broes", "" ], [ "Denecker", "Marc", "" ], [ "Stuckey", "Peter", "" ], [ "Bruynooghe", "Maurice", "" ] ]
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1402.6890
Matthew Hennessy
Matthew G. Hennessy, Victor M. Burlakov, Alain Goriely, Andreas M\"unch, and Barbara Wagner
Controlled topological transitions in thin film phase separation
Submitted 23/12/2013
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null
null
physics.flu-dyn cond-mat.mtrl-sci math.AP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper the evolution of a binary mixture in a thin-film geometry with a wall at the top and bottom is considered. By bringing the mixture into its miscibility gap so that no spinodal decomposition occurs in the bulk, a slight energetic bias of the walls towards each one of the constituents ensures the nucleation of thin boundary layers that grow until the constituents have moved into one of the two layers. These layers are separated by an interfacial region where the composition changes rapidly. Conditions that ensure the separation into two layers with a thin interfacial region are investigated based on a phase-field model. Using matched asymptotic expansions a corresponding sharp-interface problem for the location of the interface is established. It is then argued that this newly created two-layer system is not at its energetic minimum but destabilizes into a controlled self-replicating pattern of trapezoidal vertical stripes by minimizing the interfacial energy between the phases while conserving their area. A quantitative analysis of this mechanism is carried out via a thin-film model for the free interfaces, which is derived asymptotically from the sharp-interface model.
[ { "created": "Thu, 27 Feb 2014 12:42:25 GMT", "version": "v1" } ]
2014-02-28
[ [ "Hennessy", "Matthew G.", "" ], [ "Burlakov", "Victor M.", "" ], [ "Goriely", "Alain", "" ], [ "Münch", "Andreas", "" ], [ "Wagner", "Barbara", "" ] ]
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1402.6903
Smruti Ranjan Sarangi
Seema Sethia, Shouri Chatterjee, Sunil Kale, Amit Gupta, Smruti R. Sarangi
Three Experiments to Analyze the Nature of the Heat Spreader
4 pages, 9 figures
null
null
null
cs.OH
http://creativecommons.org/licenses/by/3.0/
In this paper, we describe ongoing work to investigate the properties of the heat spreader, and its implication on architecture research. In specific, we conduct two experiments to quantify the heat distribution across the surface of a spreader during normal operation. The first experiment uses T-type thermocouples, to find the temperature difference across different points on the spreader. We observe about a 6 degree celsius temperature difference on average. In the second experiment, we try to capture the temperature gradients using an infrared camera. However, this experiment was inconclusive because of some practical constraints such as the low emissivity of the spreader. We conclude that to properly model the spreader, it is necessary to conduct detailed finite element simulations. We describe a method to accurately measure the thermal conductivity of the heat spreader such that it can be used to compute the steady state temperature distribution across the spreader.
[ { "created": "Thu, 27 Feb 2014 13:45:16 GMT", "version": "v1" } ]
2014-02-28
[ [ "Sethia", "Seema", "" ], [ "Chatterjee", "Shouri", "" ], [ "Kale", "Sunil", "" ], [ "Gupta", "Amit", "" ], [ "Sarangi", "Smruti R.", "" ] ]
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1402.6905
Eric Perim Martins
E. Perim, A. F. Fonseca, N. M. Pugno, D. S. Galvao
Violation of the Universal Behavior of Membranes Inside Cylindrical Tubes at Nanoscale
null
EPL, 105 (2014) 56002
10.1209/0295-5075/105/56002
null
cond-mat.mes-hall cond-mat.mtrl-sci physics.comp-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Recently, it was proposed based on classical elasticity theory and experiments at macroscale, that the conformations of sheets inside cylindrical tubes present a universal behavior. A natural question is whether this behavior still holds at nanoscale. Based on molecular dynamics simulations and analytical modeling for graphene and boron nitride membranes confined inside carbon nanotubes, we show that the class of universality observed at macroscale is violated at nanoscale. The precise origins of these discrepancies is addressed and proven to be related to both surface and atomistic effects.
[ { "created": "Thu, 27 Feb 2014 13:48:23 GMT", "version": "v1" } ]
2014-10-06
[ [ "Perim", "E.", "" ], [ "Fonseca", "A. F.", "" ], [ "Pugno", "N. M.", "" ], [ "Galvao", "D. S.", "" ] ]
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1402.6908
Ka Chun Lam
Lee Yin Tat, Lam Ka Chun, Lui Lok Ming
Landmark-matching Transformation with Large Deformation via n-dimensional Quasi-conformal Maps
arXiv admin note: text overlap with arXiv:1210.8025 by other authors
null
null
null
cs.CG math.OC
http://creativecommons.org/licenses/by-nc-sa/3.0/
We propose a new method to obtain landmark-matching transformations between n-dimensional Euclidean spaces with large deformations. Given a set of feature correspondences, our algorithm searches for an optimal folding-free mapping that satisfies the prescribed landmark constraints. The standard conformality distortion defined for mappings between 2-dimensional spaces is first generalized to the $n$-dimensional conformality distortion $K(f)$ for a mapping $f$ between $n$-dimensional Euclidean spaces $(n \geq 3)$. We then propose a variational model involving $K(f)$ to tackle the landmark-matching problem in higher dimensional spaces. The generalized conformality term $K(f)$ enforces the bijectivity of the optimized mapping and minimizes its local geometric distortions even with large deformations. Another challenge is the high computational cost of the proposed model. To tackle this, we have also proposed a numerical method to solve the optimization problem more efficiently. Alternating direction method with multiplier (ADMM) is applied to split the optimization problem into two subproblems. Preconditioned conjugate gradient method with multi-grid preconditioner is applied to solve one of the sub-problems, while a fixed-point iteration is proposed to solve another subproblem. Experiments have been carried out on both synthetic examples and lung CT images to compute the diffeomorphic landmark-matching transformation with different landmark constraints. Results show the efficacy of our proposed model to obtain a folding-free landmark-matching transformation between $n$-dimensional spaces with large deformations.
[ { "created": "Thu, 27 Feb 2014 13:55:14 GMT", "version": "v1" }, { "created": "Mon, 11 May 2015 07:01:15 GMT", "version": "v2" } ]
2015-05-12
[ [ "Tat", "Lee Yin", "" ], [ "Chun", "Lam Ka", "" ], [ "Ming", "Lui Lok", "" ] ]
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1402.6915
Matteo Conforti
Matteo Conforti
Exact cascading nonlinearity in quasi-phase-matched quadratic media
null
null
10.1364/OL.39.002427
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The evolution of light pulses and beams in a quasi-phase-matched (QPM) quadratic medium is usually described by considering only the spatial harmonic of the QPM grating that minimizes the residual phase-mismatch. I show that, for strongly phase-mismatched interactions (the cascading regime), several harmonics need to be accounted for in order to obtain the correct value of the effective cubic nonlinearity, of which I find a simple analytical expression. I discuss the effects of the higher order harmonics of the grating on solitary wave propagation.
[ { "created": "Thu, 27 Feb 2014 14:13:10 GMT", "version": "v1" } ]
2015-06-18
[ [ "Conforti", "Matteo", "" ] ]
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1402.6916
Arghya Majee
Arghya Majee, Markus Bier, and S. Dietrich
Electrostatic interaction between colloidal particles trapped at an electrolyte interface
Submitted
J. Chem. Phys. 140, 164906 (2014)
10.1063/1.4872240
null
cond-mat.soft physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The electrostatic interaction between colloidal particles trapped at the interface between two immiscible electrolyte solutions is studied in the limit of small inter-particle distances. Within an appropriate model exact analytic expressions for the electrostatic potential as well as for the surface and line interaction energies are obtained. They demonstrate that the widely used superposition approximation, which is commonly applied to large distances between the colloidal particles, fails qualitatively at small distances and is quantitatively unreliable even at large distances. Our results contribute to an improved description of the interaction between colloidal particles trapped at fluid interfaces.
[ { "created": "Thu, 27 Feb 2014 14:13:59 GMT", "version": "v1" } ]
2014-05-07
[ [ "Majee", "Arghya", "" ], [ "Bier", "Markus", "" ], [ "Dietrich", "S.", "" ] ]
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1402.6926
Peter Foster
Peter Foster, Matthias Mauch and Simon Dixon
Sequential Complexity as a Descriptor for Musical Similarity
13 pages, 9 figures, 8 tables. Accepted version
IEEE/ACM Transactions on Audio, Speech, and Language Processing, vol. 22 no. 12, pp. 1965-1977, 2014
10.1109/TASLP.2014.2357676
null
cs.IR cs.LG cs.SD
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose string compressibility as a descriptor of temporal structure in audio, for the purpose of determining musical similarity. Our descriptors are based on computing track-wise compression rates of quantised audio features, using multiple temporal resolutions and quantisation granularities. To verify that our descriptors capture musically relevant information, we incorporate our descriptors into similarity rating prediction and song year prediction tasks. We base our evaluation on a dataset of 15500 track excerpts of Western popular music, for which we obtain 7800 web-sourced pairwise similarity ratings. To assess the agreement among similarity ratings, we perform an evaluation under controlled conditions, obtaining a rank correlation of 0.33 between intersected sets of ratings. Combined with bag-of-features descriptors, we obtain performance gains of 31.1% and 10.9% for similarity rating prediction and song year prediction. For both tasks, analysis of selected descriptors reveals that representing features at multiple time scales benefits prediction accuracy.
[ { "created": "Thu, 27 Feb 2014 14:51:48 GMT", "version": "v1" }, { "created": "Fri, 28 Feb 2014 15:14:37 GMT", "version": "v2" }, { "created": "Sun, 28 Sep 2014 23:33:44 GMT", "version": "v3" } ]
2014-09-30
[ [ "Foster", "Peter", "" ], [ "Mauch", "Matthias", "" ], [ "Dixon", "Simon", "" ] ]
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1402.6932
Xin Yuan
Xin Yuan, Patrick Llull, Xuejun Liao, Jianbo Yang, Guillermo Sapiro, David J. Brady and Lawrence Carin
Low-Cost Compressive Sensing for Color Video and Depth
8 pages, CVPR 2014
null
null
null
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A simple and inexpensive (low-power and low-bandwidth) modification is made to a conventional off-the-shelf color video camera, from which we recover {multiple} color frames for each of the original measured frames, and each of the recovered frames can be focused at a different depth. The recovery of multiple frames for each measured frame is made possible via high-speed coding, manifested via translation of a single coded aperture; the inexpensive translation is constituted by mounting the binary code on a piezoelectric device. To simultaneously recover depth information, a {liquid} lens is modulated at high speed, via a variable voltage. Consequently, during the aforementioned coding process, the liquid lens allows the camera to sweep the focus through multiple depths. In addition to designing and implementing the camera, fast recovery is achieved by an anytime algorithm exploiting the group-sparsity of wavelet/DCT coefficients.
[ { "created": "Thu, 27 Feb 2014 15:15:43 GMT", "version": "v1" } ]
2014-02-28
[ [ "Yuan", "Xin", "" ], [ "Llull", "Patrick", "" ], [ "Liao", "Xuejun", "" ], [ "Yang", "Jianbo", "" ], [ "Sapiro", "Guillermo", "" ], [ "Brady", "David J.", "" ], [ "Carin", "Lawrence", "" ] ]
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1402.6942
Jakub Nalepa
Jakub Nalepa and Zbigniew J. Czech
A Parallel Memetic Algorithm to Solve the Vehicle Routing Problem with Time Windows
15 pages
Studia Informatica 33 (1), pp 91-106 (2012)
null
null
cs.DC cs.NE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper presents a parallel memetic algorithm for solving the vehicle routing problem with time windows (VRPTW). The VRPTW is a well-known NP-hard discrete optimization problem with two objectives. The main objective is to minimize the number of vehicles serving customers scattered on the map, and the second one is to minimize the total distance traveled by the vehicles. Here, the fleet size is minimized in the first phase of the proposed method using the parallel heuristic algorithm (PHA), and the traveled distance is minimized in the second phase by the parallel memetic algorithm (PMA). In both parallel algorithms, the parallel components co-operate periodically in order to exchange the best solutions found so far. An extensive experimental study performed on the Gehring and Homberger's benchmark proves the high convergence capabilities and robustness of both PHA and PMA. Also, we present the speedup analysis of the PMA.
[ { "created": "Thu, 27 Feb 2014 15:41:05 GMT", "version": "v1" } ]
2014-02-28
[ [ "Nalepa", "Jakub", "" ], [ "Czech", "Zbigniew J.", "" ] ]
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1402.6944
Subhajit Saha
Subhajit Saha and Subenoy Chakraborty
Particle Production and Universal Thermodynamics
18 pages, 13 figures
General Relativity and Gravitation 47, 127 (2015)
10.1007/s10714-015-1964-7
null
physics.gen-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In the present work, particle creation mechanism has been employed to the Universe as a thermodynamical system. The Universe is considered to be a spatially flat FRW model and cosmic fluid is chosen as a perfect fluid with a barotropic equation of state -- $p = (\gamma -1)\rho$. By proper choice of the particle creation rate, expressions for the entropy and temperature have been determined at various stages of evolution of the Universe. Finally, using the deceleration parameter $q$ as a function of the redshift parameter $z$ based on recent observations, the particle creation rate has been evaluated and its variation at different epochs have been shown graphically.
[ { "created": "Mon, 20 Jan 2014 06:55:51 GMT", "version": "v1" }, { "created": "Sun, 21 Dec 2014 11:40:28 GMT", "version": "v2" }, { "created": "Mon, 6 Jul 2015 07:12:36 GMT", "version": "v3" } ]
2016-05-04
[ [ "Saha", "Subhajit", "" ], [ "Chakraborty", "Subenoy", "" ] ]
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1402.6949
Thomas Salez
Yu Chai, Thomas Salez, Joshua D. McGraw, Michael Benzaquen, Kari Dalnoki-Veress, Elie Rapha\"el, and James A. Forrest
A direct quantitative measure of surface mobility in a glassy polymer
null
Science, 343 994 (2014)
10.1126/science.1244845
null
cond-mat.soft cond-mat.mes-hall cond-mat.mtrl-sci cond-mat.other physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Thin polymer films have striking dynamical properties that differ from their bulk counterparts. With the simple geometry of a stepped polymer film on a substrate, we probe mobility above and below the glass transition temperature $T_{\textrm{g}}$. Above $T_{\textrm{g}}$ the entire film flows, while below $T_{\textrm{g}}$ only the near surface region responds to the excess interfacial energy. An analytical thin film model for flow limited to the free surface region shows excellent agreement with sub-$T_{\textrm{g}}$ data. The system transitions from whole film flow to surface localized flow over a narrow temperature region near the bulk $T_{\textrm{g}}$. The experiments and model provide a measure of surface mobility in a sample geometry where confinement and substrate effects are negligible. This fine control of the glassy rheology is of key interest to nanolithography among numerous other applications.
[ { "created": "Thu, 27 Feb 2014 16:05:13 GMT", "version": "v1" }, { "created": "Sun, 2 Aug 2015 15:47:33 GMT", "version": "v2" } ]
2015-08-04
[ [ "Chai", "Yu", "" ], [ "Salez", "Thomas", "" ], [ "McGraw", "Joshua D.", "" ], [ "Benzaquen", "Michael", "" ], [ "Dalnoki-Veress", "Kari", "" ], [ "Raphaël", "Elie", "" ], [ "Forrest", "James A.", "" ] ]
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1402.6952
Guangda Hu
Jop Bri\"et and Zeev Dvir and Guangda Hu and Shubhangi Saraf
Lower Bounds for Approximate LDC
null
null
null
null
cs.CC cs.DM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study an approximate version of $q$-query LDCs (Locally Decodable Codes) over the real numbers and prove lower bounds on the encoding length of such codes. A $q$-query $(\alpha,\delta)$-approximate LDC is a set $V$ of $n$ points in $\mathbb{R}^d$ so that, for each $i \in [d]$ there are $\Omega(\delta n)$ disjoint $q$-tuples $(\vec{u}_1,\ldots,\vec{u}_q) $ in $V$ so that $\text{span}(\vec{u}_1,\ldots,\vec{u}_q)$ contains a unit vector whose $i$'th coordinate is at least $\alpha$. We prove exponential lower bounds of the form $n \geq 2^{\Omega(\alpha \delta \sqrt{d})}$ for the case $q=2$ and, in some cases, stronger bounds (exponential in $d$).
[ { "created": "Thu, 27 Feb 2014 16:14:10 GMT", "version": "v1" } ]
2014-02-28
[ [ "Briët", "Jop", "" ], [ "Dvir", "Zeev", "" ], [ "Hu", "Guangda", "" ], [ "Saraf", "Shubhangi", "" ] ]
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1402.6956
Michael Marino
EXO-200 Collaboration: J.B. Albert, D.J. Auty, P.S. Barbeau, E. Beauchamp, D. Beck, V. Belov, C. Benitez-Medina, J. Bonatt, M. Breidenbach, T. Brunner, A. Burenkov, G.F. Cao, C. Chambers, J. Chaves, B. Cleveland, M. Coon, A. Craycraft, T. Daniels, M. Danilov, S.J. Daugherty, C.G. Davis, J. Davis, R. DeVoe, S. Delaquis, T. Didberidze, A. Dolgolenko, M.J. Dolinski, M. Dunford, W. Fairbank Jr., J. Farine, W. Feldmeier, P. Fierlinger, D. Fudenberg, G. Giroux, R. Gornea, K. Graham, G. Gratta, C. Hall, S. Herrin, M. Hughes, M.J. Jewell, X.S. Jiang, A. Johnson, T.N. Johnson, S. Johnston, A. Karelin, L.J. Kaufman, R. Killick, T. Koffas, S. Kravitz, A. Kuchenkov, K.S. Kumar, D.S. Leonard, F. Leonard, C. Licciardi, Y.H. Lin, R. MacLellan, M.G. Marino, B. Mong, D. Moore, R. Nelson, A. Odian, I. Ostrovskiy, C. Ouellet, A. Piepke, A. Pocar, C.Y. Prescott, A. Rivas, P.C. Rowson, M.P. Rozo, J.J. Russell, A. Schubert, D. Sinclair, S. Slutsky, E. Smith, V. Stekhanov, M. Tarka, T. Tolba, D. Tosi, K. Twelker, P. Vogel, J.-L. Vuilleumier, A. Waite, J. Walton, T. Walton, M. Weber, L.J. Wen, U. Wichoski, J.D. Wright, L. Yang, Y.-R. Yen, O.Ya. Zeldovich, Y.B. Zhao
Search for Majorana neutrinos with the first two years of EXO-200 data
9 pages, 6 figures
Nature 510, 229-234 (12 June 2014)
10.1038/nature13432
null
nucl-ex hep-ex physics.ins-det
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Many extensions of the Standard Model of particle physics suggest that neutrinos should be Majorana-type fermions, but this assumption is difficult to confirm. Observation of neutrinoless double-beta decay ($0\nu \beta \beta$), a spontaneous transition that may occur in several candidate nuclei, would verify the Majorana nature of the neutrino and constrain the absolute scale of the neutrino mass spectrum. Recent searches carried out with $^{76}$Ge (GERDA experiment) and $^{136}$Xe (KamLAND-Zen and EXO-200 experiments) have established the lifetime of this decay to be longer than $10^{25}$ yr, corresponding to a limit on the neutrino mass of 0.2-0.4 eV. Here we report new results from EXO-200 based on 100 kg$\cdot$yr of $^{136}$Xe exposure, representing an almost fourfold increase from our earlier published datasets. We have improved the detector resolution at the $^{136}$Xe double-beta-decay Q-value to $\sigma$/E = 1.53% and revised the data analysis. The obtained half-life sensitivity is $1.9\cdot10^{25}$ yr, an improvement by a factor of 2.7 compared to previous EXO-200 results. We find no statistically significant evidence for $0\nu \beta \beta$ decay and set a half-life limit of $1.1\cdot10^{25}$ yr at 90% CL. The high sensitivity holds promise for further running of the EXO-200 detector and future $0\nu \beta \beta$ decay searches with nEXO.
[ { "created": "Thu, 27 Feb 2014 16:24:12 GMT", "version": "v1" }, { "created": "Wed, 4 Jun 2014 21:13:11 GMT", "version": "v2" } ]
2014-09-25
[ [ "200 Collaboration", "", "" ], [ "Albert", "J. B.", "" ], [ "Auty", "D. J.", "" ], [ "Barbeau", "P. S.", "" ], [ "Beauchamp", "E.", "" ], [ "Beck", "D.", "" ], [ "Belov", "V.", "" ], [ "Benitez-Medina", "C.", "" ], [ "Bonatt", "J.", "" ], [ "Breidenbach", "M.", "" ], [ "Brunner", "T.", "" ], [ "Burenkov", "A.", "" ], [ "Cao", "G. F.", "" ], [ "Chambers", "C.", "" ], [ "Chaves", "J.", "" ], [ "Cleveland", "B.", "" ], [ "Coon", "M.", "" ], [ "Craycraft", "A.", "" ], [ "Daniels", "T.", "" ], [ "Danilov", "M.", "" ], [ "Daugherty", "S. J.", "" ], [ "Davis", "C. G.", "" ], [ "Davis", "J.", "" ], [ "DeVoe", "R.", "" ], [ "Delaquis", "S.", "" ], [ "Didberidze", "T.", "" ], [ "Dolgolenko", "A.", "" ], [ "Dolinski", "M. J.", "" ], [ "Dunford", "M.", "" ], [ "Fairbank", "W.", "Jr." ], [ "Farine", "J.", "" ], [ "Feldmeier", "W.", "" ], [ "Fierlinger", "P.", "" ], [ "Fudenberg", "D.", "" ], [ "Giroux", "G.", "" ], [ "Gornea", "R.", "" ], [ "Graham", "K.", "" ], [ "Gratta", "G.", "" ], [ "Hall", "C.", "" ], [ "Herrin", "S.", "" ], [ "Hughes", "M.", "" ], [ "Jewell", "M. J.", "" ], [ "Jiang", "X. S.", "" ], [ "Johnson", "A.", "" ], [ "Johnson", "T. N.", "" ], [ "Johnston", "S.", "" ], [ "Karelin", "A.", "" ], [ "Kaufman", "L. J.", "" ], [ "Killick", "R.", "" ], [ "Koffas", "T.", "" ], [ "Kravitz", "S.", "" ], [ "Kuchenkov", "A.", "" ], [ "Kumar", "K. S.", "" ], [ "Leonard", "D. S.", "" ], [ "Leonard", "F.", "" ], [ "Licciardi", "C.", "" ], [ "Lin", "Y. H.", "" ], [ "MacLellan", "R.", "" ], [ "Marino", "M. G.", "" ], [ "Mong", "B.", "" ], [ "Moore", "D.", "" ], [ "Nelson", "R.", "" ], [ "Odian", "A.", "" ], [ "Ostrovskiy", "I.", "" ], [ "Ouellet", "C.", "" ], [ "Piepke", "A.", "" ], [ "Pocar", "A.", "" ], [ "Prescott", "C. Y.", "" ], [ "Rivas", "A.", "" ], [ "Rowson", "P. C.", "" ], [ "Rozo", "M. P.", "" ], [ "Russell", "J. J.", "" ], [ "Schubert", "A.", "" ], [ "Sinclair", "D.", "" ], [ "Slutsky", "S.", "" ], [ "Smith", "E.", "" ], [ "Stekhanov", "V.", "" ], [ "Tarka", "M.", "" ], [ "Tolba", "T.", "" ], [ "Tosi", "D.", "" ], [ "Twelker", "K.", "" ], [ "Vogel", "P.", "" ], [ "Vuilleumier", "J. -L.", "" ], [ "Waite", "A.", "" ], [ "Walton", "J.", "" ], [ "Walton", "T.", "" ], [ "Weber", "M.", "" ], [ "Wen", "L. J.", "" ], [ "Wichoski", "U.", "" ], [ "Wright", "J. D.", "" ], [ "Yang", "L.", "" ], [ "Yen", "Y. -R.", "" ], [ "Zeldovich", "O. Ya.", "" ], [ "Zhao", "Y. B.", "" ] ]
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1402.6958
Andrea Cimatoribus
Andrea Cimatoribus, Hans van Haren and Louis Gostiaux
Comparison of Ellison and Thorpe scales from Eulerian ocean temperature observations
Major revision, 20 pages, 8 figures
Journal of Geophysical Research: Oceans Volume 119, Issue 10, pages 7047-7065, October 2014
10.1002/2014JC010132
null
physics.flu-dyn physics.ao-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Ocean turbulence dissipation rate is estimated either by means of microstructure shear measurements, or by adiabatically reordering vertical profiles of density. The latter technique leads to the estimate of the Thorpe scale, which in turn can be used to obtain average turbulence dissipation rate by comparing the Thorpe scale to the Ozmidov scale. In both cases, the turbulence dissipation rate can be estimated using single vertical profiles from shipborne instrumentation. We present here an alternative method to estimate the length scale of overturns by using the Ellison length scale. The Ellison scale is estimated from temperature variance just beyond the internal wave band, measured by moored instruments. We apply the method to high resolution temperature data from two moorings deployed at different locations around the Josephine seamount (North Eastern Atlantic Ocean), in a region of bottom-intensified turbulence. The variance of the temperature time series just above the internal wave frequency band is well correlated with the Thorpe scale. The method is based on the time--frequency decomposition of variance called "maximum overlap discrete wavelet transform". The results show that the Ellison length scale can be a viable alternative to the Thorpe scale for indirectly estimating turbulence dissipation rate from moored instruments in the ocean if time resolution is sufficiently high. We suggest that fine structure contaminated temperature measurements can provide reliable information on turbulence intensity.
[ { "created": "Thu, 27 Feb 2014 16:32:58 GMT", "version": "v1" }, { "created": "Tue, 18 Mar 2014 15:21:55 GMT", "version": "v2" }, { "created": "Mon, 31 Mar 2014 15:13:29 GMT", "version": "v3" }, { "created": "Wed, 7 May 2014 15:41:40 GMT", "version": "v4" }, { "created": "Fri, 19 Sep 2014 09:02:56 GMT", "version": "v5" } ]
2014-12-16
[ [ "Cimatoribus", "Andrea", "" ], [ "van Haren", "Hans", "" ], [ "Gostiaux", "Louis", "" ] ]
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1402.6959
Mihaela Vatasescu
Mihaela Vatasescu
Entanglement between electronic and vibrational degrees of freedom in a laser-driven molecular system
30 pages, 8 figures
Phys. Rev. A 88, 063415 (2013)
10.1103/PhysRevA.88.063415
null
quant-ph physics.atm-clus physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We investigate the entanglement between electronic and vibrational degrees of freedom produced by a vibronic coupling in a molecular system described in the Born-Oppenheimer approximation. Entanglement in a pure state of the Hilbert space $\cal{H}$$=$$\cal{H}$$_{el}$$\bigotimes$$\cal{H}$$_{vib}$ is quantified using the von Neumann entropy of the reduced density matrix and the reduced linear entropy. Expressions for these entanglement measures are derived for the $2 \times N_v$ and $3 \times N_v$ cases of the bipartite entanglement, where 2 and 3 are the dimensions of the electronic Hilbert space $\cal{H}$$_{el}$, and $N_v$ is the dimension of $\cal{H}$$_{vib}$. We study the entanglement dynamics for two electronic states coupled by a laser pulse (a $2 \times N_v$ case), taking as an example a coupling between the $a^3\Sigma_{u}^{+} (6s,6s)$ and $1_g(6s,6p_{3/2})$ states of the Cs$_2$ molecule. The reduced linear entropy expression obtained for the $3 \times N_v$ case is used to follow the entanglement evolution in a scheme proposed for the control of the vibronic dynamics in a Cs$_2$ cold molecule, implying the $a^3\Sigma_{u}^{+}(6s,6s)$, $0_g^-(6s,6p_{3/2})$, and $0_g^-(6s,5d)$ electronic states, which are coupled by a non-adiabatic radial coupling and a sequence of chirped laser pulses.
[ { "created": "Thu, 27 Feb 2014 16:33:32 GMT", "version": "v1" } ]
2014-03-05
[ [ "Vatasescu", "Mihaela", "" ] ]
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1402.6964
Austin Benson
Austin R. Benson, Jason D. Lee, Bartek Rajwa, David F. Gleich
Scalable methods for nonnegative matrix factorizations of near-separable tall-and-skinny matrices
null
Proceedings of Neural Information Processing Systems, 2014
null
null
cs.LG cs.DC cs.NA stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Numerous algorithms are used for nonnegative matrix factorization under the assumption that the matrix is nearly separable. In this paper, we show how to make these algorithms efficient for data matrices that have many more rows than columns, so-called "tall-and-skinny matrices". One key component to these improved methods is an orthogonal matrix transformation that preserves the separability of the NMF problem. Our final methods need a single pass over the data matrix and are suitable for streaming, multi-core, and MapReduce architectures. We demonstrate the efficacy of these algorithms on terabyte-sized synthetic matrices and real-world matrices from scientific computing and bioinformatics.
[ { "created": "Thu, 27 Feb 2014 16:41:26 GMT", "version": "v1" } ]
2018-01-08
[ [ "Benson", "Austin R.", "" ], [ "Lee", "Jason D.", "" ], [ "Rajwa", "Bartek", "" ], [ "Gleich", "David F.", "" ] ]
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Scalable methods for nonnegative matrix factorizations of near-separable tall-and-skinny matrices
http://arxiv.org/abs/1402.6964v1
http://arxiv.org/pdf/1402.6964v1.pdf
https://github.com/arbenson/mrnmf
true
true
https://paperswithcode.com/paper/scalable-methods-for-nonnegative-matrix
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1402.6967
Kristian Madsen
K. H. Madsen, S. Ates, J. Liu, A. Javadi, S. M. Albrecht, I. Yeo, S. Stobbe, P. Lodahl
Efficient out-coupling of high-purity single photons from a coherent quantum dot in a photonic-crystal cavity
13 pages, 8 figures, submitted
Phys. Rev. B 90, 155303 (2014)
10.1103/PhysRevB.90.155303
null
quant-ph cond-mat.mes-hall physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We demonstrate a single-photon collection efficiency of $(44.3\pm2.1)\%$ from a quantum dot in a low-Q mode of a photonic-crystal cavity with a single-photon purity of $g^{(2)}(0)=(4\pm5)\%$ recorded above the saturation power. The high efficiency is directly confirmed by detecting up to $962\pm46$ kilocounts per second on a single-photon detector on another quantum dot coupled to the cavity mode. The high collection efficiency is found to be broadband, as is explained by detailed numerical simulations. Cavity-enhanced efficient excitation of quantum dots is obtained through phonon-mediated excitation and under these conditions, single-photon indistinguishability measurements reveal long coherence times reaching $0.77\pm0.19$ ns in a weak-excitation regime. Our work demonstrates that photonic crystals provide a very promising platform for highly integrated generation of coherent single photons including the efficient out-coupling of the photons from the photonic chip.
[ { "created": "Thu, 27 Feb 2014 16:45:48 GMT", "version": "v1" }, { "created": "Thu, 2 Oct 2014 16:08:35 GMT", "version": "v2" } ]
2014-10-14
[ [ "Madsen", "K. H.", "" ], [ "Ates", "S.", "" ], [ "Liu", "J.", "" ], [ "Javadi", "A.", "" ], [ "Albrecht", "S. M.", "" ], [ "Yeo", "I.", "" ], [ "Stobbe", "S.", "" ], [ "Lodahl", "P.", "" ] ]
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1402.6970
Daegene Song
D. Song
The P versus NP Problem in Quantum Physics
4 pages, 2 figures
null
null
null
physics.gen-ph cs.CC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Motivated by the fact that information is encoded and processed by physical systems, the P versus NP problem is examined in terms of physical processes. In particular, we consider P as a class of deterministic, and NP as nondeterministic, polynomial-time physical processes. Based on these identifications, we review a self-reference physical process in quantum theory, which belongs to NP but cannot be contained in P.
[ { "created": "Wed, 12 Feb 2014 01:21:32 GMT", "version": "v1" } ]
2014-02-28
[ [ "Song", "D.", "" ] ]
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1402.6973
Michael Markovitch
Michael Markovitch, Gabriel Scalosub
Bounded Delay Scheduling with Packet Dependencies
null
null
null
null
cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A common situation occurring when dealing with multimedia traffic is having large data frames fragmented into smaller IP packets, and having these packets sent independently through the network. For real-time multimedia traffic, dropping even few packets of a frame may render the entire frame useless. Such traffic is usually modeled as having {\em inter-packet dependencies}. We study the problem of scheduling traffic with such dependencies, where each packet has a deadline by which it should arrive at its destination. Such deadlines are common for real-time multimedia applications, and are derived from stringent delay constraints posed by the application. The figure of merit in such environments is maximizing the system's {\em goodput}, namely, the number of frames successfully delivered. We study online algorithms for the problem of maximizing goodput of delay-bounded traffic with inter-packet dependencies, and use competitive analysis to evaluate their performance. We present competitive algorithms for the problem, as well as matching lower bounds that are tight up to a constant factor. We further present the results of a simulation study which further validates our algorithmic approach and shows that insights arising from our analysis are indeed manifested in practice.
[ { "created": "Thu, 27 Feb 2014 17:02:30 GMT", "version": "v1" } ]
2014-02-28
[ [ "Markovitch", "Michael", "" ], [ "Scalosub", "Gabriel", "" ] ]
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1402.6977
James Paul Sobol Mr
J. P. Sobol and Saijun Wu
Imaging cold atoms with shot-noise and diffraction limited holography
16 pages, 4 figures. An inaccurate statement has been corrected
null
10.1088/1367-2630/16/9/093064
null
physics.atom-ph physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We theoretically develop and experimentally demonstrate a holographic method for imaging cold atoms at the diffraction and photon shot noise limits. Aided by a double point source reference field, a simple iterative algorithm robustly removes the twin image of an $^{87}$Rb cold atom sample during the image reconstruction. Shot-noise limited phase shift and absorption images are consistently retrieved at various probe detunings, and during the laser cooling process. We consistently resolve less than 2 mrad phase shift ($0.4~\%$ attenuation) of the probe light, outperforming shot-noise limited phase-contrast (absorption) imaging by a factor of 4 or more if the same camera is used without pixel saturation. We discuss the possible extension of this work for precise phase imaging of dense atomic gases, and for off-resonant probing of multiple atoms in optical lattices.
[ { "created": "Thu, 27 Feb 2014 17:13:58 GMT", "version": "v1" }, { "created": "Thu, 12 Jun 2014 14:27:58 GMT", "version": "v2" }, { "created": "Mon, 11 Aug 2014 15:46:40 GMT", "version": "v3" }, { "created": "Wed, 13 Aug 2014 09:00:36 GMT", "version": "v4" } ]
2015-06-18
[ [ "Sobol", "J. P.", "" ], [ "Wu", "Saijun", "" ] ]
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1402.6978
Kamesh Namuduri
Kamesh Namuduri and Gayatri Mehta
Fundamental Limits of Video Coding: A Closed-form Characterization of Rate Distortion Region from First Principles
12 pages, 7 figures
null
null
null
cs.IT cs.MM math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Classical motion-compensated video coding methods have been standardized by MPEG over the years and video codecs have become integral parts of media entertainment applications. Despite the ubiquitous use of video coding techniques, it is interesting to note that a closed form rate-distortion characterization for video coding is not available in the literature. In this paper, we develop a simple, yet, fundamental characterization of rate-distortion region in video coding based on information-theoretic first principles. The concept of conditional motion estimation is used to derive the closedform expression for rate-distortion region without losing its generality. Conditional motion estimation offers an elegant means to analyze the rate-distortion trade-offs and demonstrates the viability of achieving the bounds derived. The concept involves classifying image regions into active and inactive based on the amount of motion activity. By appropriately modeling the residuals corresponding to active and inactive regions, a closed form expression for rate-distortion function is derived in terms of motion activity and spatio-temporal correlation that commonly exist in video content. Experiments on real video clips using H.264 codec are presented to demonstrate the practicality and validity of the proposed rate-distortion analysis.
[ { "created": "Thu, 27 Feb 2014 17:24:30 GMT", "version": "v1" } ]
2014-02-28
[ [ "Namuduri", "Kamesh", "" ], [ "Mehta", "Gayatri", "" ] ]
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1402.6979
Nicholas Mecholsky
Nicholas A. Mecholsky, Lorenzo Resca, Ian L. Pegg, Marco Fornari
Theory of Band Warping and its Effects on Thermoelectronic Transport Properties
23 pages, 5 figures. To appear in Physical Review B
Phys. Rev. B 89, 155131 (2014)
10.1103/PhysRevB.89.155131
null
cond-mat.mtrl-sci cond-mat.other physics.comp-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Optical and transport properties of materials depend heavily upon features of electronic band structures in proximity to energy extrema in the Brillouin zone (BZ). Such features are generally described in terms of multi-dimensional quadratic expansions and corresponding definitions of effective masses. Multi-dimensional expansions, however, are permissible only under strict conditions that are typically violated by degenerate bands and even some non-degenerate bands. Suggestive terms such as "band warping" or "corrugated energy surfaces" have been used to refer to such situations and ad hoc methods have been developed to treat them. While numerical calculations may reflect such features, a complete theory of band warping has not been developed. We develop a generally applicable theory, based on radial expansions, and a corresponding definition of angular effective mass. Our theory also accounts for effects of band non-parabolicity and anisotropy, which hitherto have not been precisely distinguished from, if not utterly confused with, band warping. Based on our theory, we develop precise procedures to evaluate band warping quantitatively. As a benchmark demonstration, we analyze the warping features of valence bands in silicon using first-principles calculations and we compare those with previous semi-empirical models. We use our theory and angular effective masses to generalize derivations of tensorial transport coefficients for cases of either single or multiple electronic bands, with either quadratically expansible or warped energy surfaces. From that theory we discover the formal existence at critical points of transport-equivalent ellipsoidal bands that yield identical results from the standpoint of any transport property. Additionally, we illustrate the drastic effects that band warping can induce on thermoelectric properties using multi-band models.
[ { "created": "Thu, 27 Feb 2014 17:27:35 GMT", "version": "v1" }, { "created": "Wed, 5 Mar 2014 19:06:33 GMT", "version": "v2" } ]
2014-04-29
[ [ "Mecholsky", "Nicholas A.", "" ], [ "Resca", "Lorenzo", "" ], [ "Pegg", "Ian L.", "" ], [ "Fornari", "Marco", "" ] ]
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1402.6985
Drew Thomas
M. S. Benilov, D. M. Thomas
Asymptotic theory of double layer and shielding of electric field at the edge of illuminated plasma
5 figures, submitted to Physics of Plasmas
Phys. Plasmas 21 (2014) 043501
10.1063/1.4870013
null
physics.plasm-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The method of matched asymptotic expansions is applied to the problem of a collisionless plasma generated by UV illumination localized in a central part of the plasma in the limiting case of small Debye length ${\lambda}_D$. A second-approximation asymptotic solution is found for the double layer positioned at the boundary of the illuminated region and for the un-illuminated plasma for the plane geometry. Numerical calculations for different values of ${\lambda}_D$ are reported and found to confirm the asymptotic results. The net integral space charge of the double layer is asymptotically small, although in the plane geometry it is just sufficient to shield the ambipolar electric field existing in the illuminated region and thus to prevent it from penetrating into the un-illuminated region. The double layer has the same mathematical nature as the intermediate transition layer separating an active plasma and a collisionless sheath, and the underlying physics is also the same. In essence, the two layers represent the same physical object: a transonic layer.
[ { "created": "Thu, 27 Feb 2014 17:38:54 GMT", "version": "v1" } ]
2015-07-20
[ [ "Benilov", "M. S.", "" ], [ "Thomas", "D. M.", "" ] ]
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1402.6990
Janos Balog
Janos Balog
Relativistic trajectory variables in 1+1 dimensional Ruijsenaars-Schneider type models
17 pages, latex. Introduction rearranged, references added
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hep-th physics.class-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A general algorithm to construct particle trajectories in 1+1 dimensional canonical relativistic models is presented. The method is a generalization of the construction used in Ruijsenaars-Schneider models and provides a simple proof of the fact that the latter satisfies the world-line conditions granting proper physical Poincare invariance. The 2-particle case for the rational Ruijsenaars-Schneider model is worked out explicitly. It is shown that the particle coordinates do not Poisson commute, as required by the no-interaction theorem of Currie, Jordan and Sudarshan.
[ { "created": "Thu, 27 Feb 2014 17:49:35 GMT", "version": "v1" }, { "created": "Sat, 8 Mar 2014 09:46:13 GMT", "version": "v2" } ]
2014-03-11
[ [ "Balog", "Janos", "" ] ]
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1402.6991
Sujit Datta
Sujit S. Datta, T. S. Ramakrishnan, and David A. Weitz
Mobilization of a trapped non-wetting fluid from a three-dimensional porous medium
null
Physics of Fluids 26, 022002 (2014)
10.1063/1.4866641
null
physics.flu-dyn cond-mat.dis-nn cond-mat.mes-hall cond-mat.soft physics.geo-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We use confocal microscopy to directly visualize the formation and complex morphologies of trapped non-wetting fluid ganglia within a model 3D porous medium. The wetting fluid continues to flow around the ganglia after they form; this flow is characterized by a capillary number, Ca. We find that the ganglia configurations do not vary for small Ca; by contrast, as Ca is increased above a threshold value, the largest ganglia start to become mobilized and are ultimately removed from the medium. By combining our 3D visualization with measurements of the bulk transport, we show that this behavior can be quantitatively understood by balancing the viscous forces exerted on the ganglia with the pore-scale capillary forces that keep them trapped within the medium. Our work thus helps elucidate the fluid dynamics underlying the mobilization of a trapped non-wetting fluid from a 3D porous medium.
[ { "created": "Thu, 27 Feb 2014 17:49:35 GMT", "version": "v1" } ]
2014-02-28
[ [ "Datta", "Sujit S.", "" ], [ "Ramakrishnan", "T. S.", "" ], [ "Weitz", "David A.", "" ] ]
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1402.6993
Gabriele Sicuro
Sergio Caracciolo, Carlo Lucibello, Giorgio Parisi, Gabriele Sicuro
Scaling hypothesis for the Euclidean bipartite matching problem
11 pages
Phys. Rev. E 90, 012118 (2014)
10.1103/PhysRevE.90.012118
null
cond-mat.dis-nn cs.DM cs.GR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose a simple yet very predictive form, based on a Poisson's equation, for the functional dependence of the cost from the density of points in the Euclidean bipartite matching problem. This leads, for quadratic costs, to the analytic prediction of the large $N$ limit of the average cost in dimension $d=1,2$ and of the subleading correction in higher dimension. A non-trivial scaling exponent, $\gamma_d=\frac{d-2}{d}$, which differs from the monopartite's one, is found for the subleading correction. We argue that the same scaling holds true for a generic cost exponent in dimension $d>2$.
[ { "created": "Thu, 27 Feb 2014 17:52:34 GMT", "version": "v1" }, { "created": "Fri, 22 Aug 2014 09:24:31 GMT", "version": "v2" } ]
2014-08-25
[ [ "Caracciolo", "Sergio", "" ], [ "Lucibello", "Carlo", "" ], [ "Parisi", "Giorgio", "" ], [ "Sicuro", "Gabriele", "" ] ]
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1402.6999
Philippe Regis Guy Piot
P. Piot, C. A. Brau, B. K. Choi, B. Blomberg, W. E. Gabella, B. Ivanov, J. Jarvis, M. H. Mendenhall, D. Mihalcea, S. Panuganti, P. Prieto, J. Reid
First Operation of an Ungated Diamond Field-Emission Array Cathode in a L-Band Radiofrequency Electron Source
4 pages, 7 figures; preprint submitted to Applied Physics Letters
Appl. Phys. Lett. 104, 263504 (2014)
10.1063/1.4884375
FERMILAB-PUB-13-323-APC
physics.acc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We report on the first successful operation of a field-emitter-array cathode in a conventional L-band radio-frequency electron source. The cathode consisted of an array of $\sim 10^6$ diamond diamond tips on pyramids. Maximum current on the order of 15~mA were reached and the cathode did not show appreciable signs of fatigue after weeks of operation. The measured Fowler-Nordheim characteristics, transverse beam density, and current stability are discussed. Numerical simulations of the beam dynamics are also presented.
[ { "created": "Thu, 27 Feb 2014 18:30:36 GMT", "version": "v1" } ]
2014-07-07
[ [ "Piot", "P.", "" ], [ "Brau", "C. A.", "" ], [ "Choi", "B. K.", "" ], [ "Blomberg", "B.", "" ], [ "Gabella", "W. E.", "" ], [ "Ivanov", "B.", "" ], [ "Jarvis", "J.", "" ], [ "Mendenhall", "M. H.", "" ], [ "Mihalcea", "D.", "" ], [ "Panuganti", "S.", "" ], [ "Prieto", "P.", "" ], [ "Reid", "J.", "" ] ]
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1402.7001
Laurens van der Maaten
Laurens van der Maaten, Minmin Chen, Stephen Tyree and Kilian Weinberger
Marginalizing Corrupted Features
null
null
null
null
cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The goal of machine learning is to develop predictors that generalize well to test data. Ideally, this is achieved by training on an almost infinitely large training data set that captures all variations in the data distribution. In practical learning settings, however, we do not have infinite data and our predictors may overfit. Overfitting may be combatted, for example, by adding a regularizer to the training objective or by defining a prior over the model parameters and performing Bayesian inference. In this paper, we propose a third, alternative approach to combat overfitting: we extend the training set with infinitely many artificial training examples that are obtained by corrupting the original training data. We show that this approach is practical and efficient for a range of predictors and corruption models. Our approach, called marginalized corrupted features (MCF), trains robust predictors by minimizing the expected value of the loss function under the corruption model. We show empirically on a variety of data sets that MCF classifiers can be trained efficiently, may generalize substantially better to test data, and are also more robust to feature deletion at test time.
[ { "created": "Thu, 27 Feb 2014 18:31:33 GMT", "version": "v1" } ]
2014-02-28
[ [ "van der Maaten", "Laurens", "" ], [ "Chen", "Minmin", "" ], [ "Tyree", "Stephen", "" ], [ "Weinberger", "Kilian", "" ] ]
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1402.7005
Ziyu Wang
Ziyu Wang, Babak Shakibi, Lin Jin, Nando de Freitas
Bayesian Multi-Scale Optimistic Optimization
15 pages
null
null
null
stat.ML cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Bayesian optimization is a powerful global optimization technique for expensive black-box functions. One of its shortcomings is that it requires auxiliary optimization of an acquisition function at each iteration. This auxiliary optimization can be costly and very hard to carry out in practice. Moreover, it creates serious theoretical concerns, as most of the convergence results assume that the exact optimum of the acquisition function can be found. In this paper, we introduce a new technique for efficient global optimization that combines Gaussian process confidence bounds and treed simultaneous optimistic optimization to eliminate the need for auxiliary optimization of acquisition functions. The experiments with global optimization benchmarks and a novel application to automatic information extraction demonstrate that the resulting technique is more efficient than the two approaches from which it draws inspiration. Unlike most theoretical analyses of Bayesian optimization with Gaussian processes, our finite-time convergence rate proofs do not require exact optimization of an acquisition function. That is, our approach eliminates the unsatisfactory assumption that a difficult, potentially NP-hard, problem has to be solved in order to obtain vanishing regret rates.
[ { "created": "Thu, 27 Feb 2014 18:38:02 GMT", "version": "v1" } ]
2014-02-28
[ [ "Wang", "Ziyu", "" ], [ "Shakibi", "Babak", "" ], [ "Jin", "Lin", "" ], [ "de Freitas", "Nando", "" ] ]
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1402.7006
J. M. Vaquero
D. Mateos, M. Ant\'on and J. M. Vaquero
Influence of solar eclipse of November 3rd, 2013 on the total ozone column over Badajoz, Spain
15 pages, 3 figures, accepted for publication in Journal of Atmospheric and Solar-Terrestrial Physics
null
10.1016/j.jastp.2014.02.005
null
physics.ao-ph astro-ph.EP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The hybrid eclipse of November 3rd, 2013 was observed as partial with a magnitude equal to 0.126 from Badajoz (38^\circ 53' N, 6^\circ 58' W). The evolution of the Total Ozone Column (TOC) values during 4 hours was monitored using a Solar Light Microtops-II manual sun-photometer. Before the eclipse, TOC remained invariable ~280 Dobson Units (DU) for one hour and a half. Once the eclipse was started, a clear decrease in TOC occurred. After the eclipse maximum (with TOC = 273 DU), a rapid TOC recovery was observed. When the eclipse was over, TOC came back to values ~280 DU.
[ { "created": "Thu, 27 Feb 2014 19:07:53 GMT", "version": "v1" } ]
2015-06-18
[ [ "Mateos", "D.", "" ], [ "Antón", "M.", "" ], [ "Vaquero", "J. M.", "" ] ]
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1402.7011
Matjaz Perc
Dirk Helbing, Dirk Brockmann, Thomas Chadefaux, Karsten Donnay, Ulf Blanke, Olivia Woolley-Meza, Mehdi Moussaid, Anders Johansson, Jens Krause, Sebastian Schutte, Matjaz Perc
Saving Human Lives: What Complexity Science and Information Systems can Contribute
67 pages, 25 figures; accepted for publication in Journal of Statistical Physics [for related work see http://www.futurict.eu/]
J. Stat. Phys. 158 (2015) 735-781
10.1007/s10955-014-1024-9
null
physics.soc-ph cs.SI nlin.AO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We discuss models and data of crowd disasters, crime, terrorism, war and disease spreading to show that conventional recipes, such as deterrence strategies, are often not effective and sufficient to contain them. Many common approaches do not provide a good picture of the actual system behavior, because they neglect feedback loops, instabilities and cascade effects. The complex and often counter-intuitive behavior of social systems and their macro-level collective dynamics can be better understood by means of complexity science. We highlight that a suitable system design and management can help to stop undesirable cascade effects and to enable favorable kinds of self-organization in the system. In such a way, complexity science can help to save human lives.
[ { "created": "Wed, 26 Feb 2014 20:51:27 GMT", "version": "v1" }, { "created": "Thu, 22 May 2014 19:56:11 GMT", "version": "v2" } ]
2015-02-04
[ [ "Helbing", "Dirk", "" ], [ "Brockmann", "Dirk", "" ], [ "Chadefaux", "Thomas", "" ], [ "Donnay", "Karsten", "" ], [ "Blanke", "Ulf", "" ], [ "Woolley-Meza", "Olivia", "" ], [ "Moussaid", "Mehdi", "" ], [ "Johansson", "Anders", "" ], [ "Krause", "Jens", "" ], [ "Schutte", "Sebastian", "" ], [ "Perc", "Matjaz", "" ] ]
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1402.7015
Fabian Pedregosa
Fabian Pedregosa (INRIA Saclay - Ile de France, INRIA Paris - Rocquencourt), Michael Eickenberg (INRIA Saclay - Ile de France, LNAO), Philippe Ciuciu (INRIA Saclay - Ile de France, NEUROSPIN), Bertrand Thirion (INRIA Saclay - Ile de France, NEUROSPIN), Alexandre Gramfort (LTCI)
Data-driven HRF estimation for encoding and decoding models
appears in NeuroImage (2015)
null
10.1016/j.neuroimage.2014.09.060
null
cs.CE cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Despite the common usage of a canonical, data-independent, hemodynamic response function (HRF), it is known that the shape of the HRF varies across brain regions and subjects. This suggests that a data-driven estimation of this function could lead to more statistical power when modeling BOLD fMRI data. However, unconstrained estimation of the HRF can yield highly unstable results when the number of free parameters is large. We develop a method for the joint estimation of activation and HRF using a rank constraint causing the estimated HRF to be equal across events/conditions, yet permitting it to be different across voxels. Model estimation leads to an optimization problem that we propose to solve with an efficient quasi-Newton method exploiting fast gradient computations. This model, called GLM with Rank-1 constraint (R1-GLM), can be extended to the setting of GLM with separate designs which has been shown to improve decoding accuracy in brain activity decoding experiments. We compare 10 different HRF modeling methods in terms of encoding and decoding score in two different datasets. Our results show that the R1-GLM model significantly outperforms competing methods in both encoding and decoding settings, positioning it as an attractive method both from the points of view of accuracy and computational efficiency.
[ { "created": "Thu, 27 Feb 2014 18:50:58 GMT", "version": "v1" }, { "created": "Sun, 6 Apr 2014 06:11:17 GMT", "version": "v2" }, { "created": "Tue, 15 Jul 2014 11:14:00 GMT", "version": "v3" }, { "created": "Mon, 6 Oct 2014 16:39:55 GMT", "version": "v4" }, { "created": "Fri, 31 Oct 2014 13:47:01 GMT", "version": "v5" }, { "created": "Fri, 7 Nov 2014 11:27:19 GMT", "version": "v6" } ]
2014-11-10
[ [ "Pedregosa", "Fabian", "", "INRIA Saclay - Ile de France, INRIA Paris -\n Rocquencourt" ], [ "Eickenberg", "Michael", "", "INRIA Saclay - Ile de France, LNAO" ], [ "Ciuciu", "Philippe", "", "INRIA Saclay - Ile de France, NEUROSPIN" ], [ "Thirion", "Bertrand", "", "INRIA Saclay - Ile de France, NEUROSPIN" ], [ "Gramfort", "Alexandre", "", "LTCI" ] ]
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1402.7017
Ichrak Amdouni
Ichrak Amdouni (INRIA Paris-Rocquencourt), C\'edric Adjih (INRIA Paris-Rocquencourt), Pascale Minet (INRIA Paris-Rocquencourt)
Joint Routing and STDMA-based Scheduling to Minimize Delays in Grid Wireless Sensor Networks
null
null
null
RR-8488
cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this report, we study the issue of delay optimization and energy efficiency in grid wireless sensor networks (WSNs). We focus on STDMA (Spatial Reuse TDMA)) scheduling, where a predefined cycle is repeated, and where each node has fixed transmission opportunities during specific slots (defined by colors). We assume a STDMA algorithm that takes advantage of the regularity of grid topology to also provide a spatially periodic coloring ("tiling" of the same color pattern). In this setting, the key challenges are: 1) minimizing the average routing delay by ordering the slots in the cycle 2) being energy efficient. Our work follows two directions: first, the baseline performance is evaluated when nothing specific is done and the colors are randomly ordered in the STDMA cycle. Then, we propose a solution, ORCHID that deliberately constructs an efficient STDMA schedule. It proceeds in two steps. In the first step, ORCHID starts form a colored grid and builds a hierarchical routing based on these colors. In the second step, ORCHID builds a color ordering, by considering jointly both routing and scheduling so as to ensure that any node will reach a sink in a single STDMA cycle. We study the performance of these solutions by means of simulations and modeling. Results show the excellent performance of ORCHID in terms of delays and energy compared to a shortest path routing that uses the delay as a heuristic. We also present the adaptation of ORCHID to general networks under the SINR interference model.
[ { "created": "Thu, 27 Feb 2014 18:53:29 GMT", "version": "v1" }, { "created": "Mon, 1 Sep 2014 12:19:50 GMT", "version": "v2" } ]
2014-09-02
[ [ "Amdouni", "Ichrak", "", "INRIA Paris-Rocquencourt" ], [ "Adjih", "Cédric", "", "INRIA\n Paris-Rocquencourt" ], [ "Minet", "Pascale", "", "INRIA Paris-Rocquencourt" ] ]
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1402.7019
Ossi Kaltiokallio J.
Ossi Kaltiokallio, H\"useyin Yi\u{g}itler, and Riku J\"antti
A Three-State Received Signal Strength Model for Device-free Localization
null
null
null
null
cs.OH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The indoor radio propagation channel is typically modeled as a two-state time-variant process where one of the states represents the channel when the environment is static, whereas the other state characterizes the medium when it is altered by people. In this paper, the aforementioned process is augmented with an additional state. It is shown that the changes in received signal strength are dictated by: i) electronic noise, when a person is not present in the monitored area; ii) reflection, when a person is moving in the close vicinity of the line-of-sight; iii) shadowing, when a person is obstructing the line-of-sight component of the transmitter-receiver pair. Statistical and spatial models for the three states are derived and the models are empirically validated. Based on the models, a simplistic device-free localization application is designed which aims to: first, estimate the temporal state of the channel using a hidden Markov model; second, track a person using a particle filter. The results suggest that the tracking accuracy is enhanced by at least 65% while the link's sensitivity region is increased by 100% or more with respect to empirical models presented in earlier works.
[ { "created": "Mon, 24 Feb 2014 18:31:56 GMT", "version": "v1" } ]
2014-02-28
[ [ "Kaltiokallio", "Ossi", "" ], [ "Yiğitler", "Hüseyin", "" ], [ "Jäntti", "Riku", "" ] ]
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1402.7023
Robert Van Gorder
Robert A. Van Gorder
Quantum Hasimoto transformation and nonlinear waves on a superfluid vortex filament under the quantum local induction approximation
33 pages, 6 figures
null
null
null
physics.flu-dyn nlin.CD nlin.PS nlin.SI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Hasimoto transformation between the classical LIA (local induction approximation, a model approximating the motion of a thin vortex filament) and the nonlinear Schr\"odinger equation (NLS) has proven very useful in the past, since it allows one to construct new solutions to the LIA once a solution to the NLS is known. In the present paper, the quantum form of the LIA (which includes mutual friction effects) is put into correspondence with a type of complex nonlinear dispersive partial differential equation (PDE) with cubic nonlinearity (similar in form to a Ginsburg-Landau equation, with additional nonlinear terms). Transforming the quantum LIA in such a way enables one to obtain quantum vortex filament solutions once solutions to this dispersive PDE are known. From our quantum Hasimoto transformation, we determine the form and behavior of Stokes waves and a standing 1-soliton solution under normal and binormal friction effects. The soliton solution on a quantum vortex filament is a natural generalization of the classical 1-soliton solution constructed mathematically by Hasimoto (which motivated subsequent real-world experiments). The quantum Hasimoto transformation is useful when normal fluid velocity is relatively weak, so for the case where the normal fluid velocity is dominant we resort to other approaches. We consider the dynamics of the tangent vector to the vortex filament directly from the quantum LIA, and this approach, while less elegant than the quantum Hasimoto transformation, enables us to study waves primarily driven by the normal fluid velocity.
[ { "created": "Wed, 5 Feb 2014 01:20:04 GMT", "version": "v1" }, { "created": "Thu, 3 Jul 2014 22:20:03 GMT", "version": "v2" }, { "created": "Wed, 19 Nov 2014 22:52:28 GMT", "version": "v3" } ]
2014-11-21
[ [ "Van Gorder", "Robert A.", "" ] ]
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1402.7025
Max Welling
Max Welling
Exploiting the Statistics of Learning and Inference
Proceedings of the NIPS workshop on "Probabilistic Models for Big Data"
null
null
null
cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
When dealing with datasets containing a billion instances or with simulations that require a supercomputer to execute, computational resources become part of the equation. We can improve the efficiency of learning and inference by exploiting their inherent statistical nature. We propose algorithms that exploit the redundancy of data relative to a model by subsampling data-cases for every update and reasoning about the uncertainty created in this process. In the context of learning we propose to test for the probability that a stochastically estimated gradient points more than 180 degrees in the wrong direction. In the context of MCMC sampling we use stochastic gradients to improve the efficiency of MCMC updates, and hypothesis tests based on adaptive mini-batches to decide whether to accept or reject a proposed parameter update. Finally, we argue that in the context of likelihood free MCMC one needs to store all the information revealed by all simulations, for instance in a Gaussian process. We conclude that Bayesian methods will remain to play a crucial role in the era of big data and big simulations, but only if we overcome a number of computational challenges.
[ { "created": "Wed, 26 Feb 2014 10:47:09 GMT", "version": "v1" }, { "created": "Tue, 4 Mar 2014 21:12:43 GMT", "version": "v2" } ]
2014-03-06
[ [ "Welling", "Max", "" ] ]
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1402.7031
Lev Mourokh
Lev Mourokh and Franco Nori
Energy transfer efficiency in the FMO complex strongly coupled to a vibronic mode
null
Phys. Rev. E 92, 052720 (2015)
10.1103/PhysRevE.92.052720
null
physics.bio-ph physics.chem-ph quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Using methods of condensed matter and statistical physics, we examine the transport of excitons through the Fenna-Matthews-Olson (FMO) complex from a receiving antenna to a reaction center. Writing the equations of motion for the exciton creation/annihilation operators, we are able to describe the exciton dynamics, even in the regime when the reorganization energy is of the order of the intra-system couplings. In particular, we obtain the well-known quantum oscillations of the site populations. We determine the exciton transfer efficiency in the presence of a quenching field and protein environment. While the majority of the protein vibronic modes are treated as a heat bath, we address the situation when specific modes are strongly coupled to excitons and examine the effects of these modes on the quantum oscillations and the energy transfer efficiency. We find that, for the vibronic frequencies below 16 meV, the exciton transfer is drastically suppressed. We attribute this effect to the formation of "polaronic states" where the exciton is transferred back and forth between the two pigments with the absorption/emission of the vibronic quanta, instead of proceeding to the reaction center. The same effect suppresses the quantum beating at the vibronic frequency of 25 meV. We also show that the efficiency of the energy transfer can be enhanced when the vibronic mode strongly couples to the third pigment only, instead of coupling to the entire system.
[ { "created": "Tue, 11 Feb 2014 23:44:31 GMT", "version": "v1" } ]
2016-02-23
[ [ "Mourokh", "Lev", "" ], [ "Nori", "Franco", "" ] ]
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1402.7032
Xiangqun Fu
Xiangqun Fu, Wansu Bao, Jianhong Shi, Fada Li, Yuchao Zhang
Parameter security characterization of knapsack public-key crypto under quantum computing
9 pages
null
null
null
cs.CR cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In order to research the security of the knapsack problem under quantum algorithm attack, we study the quantum algorithm for knapsack problem over Z_r based on the relation between the dimension of the knapsack vector and r. First, the oracle function is designed based on the knapsack vector B and S, and the quantum algorithm for the knapsack problem over Z_r is presented. The observation probability of target state is not improved by designing unitary transform, but oracle function. Its complexity is polynomial. And its success probability depends on the relation between n and r. From the above discussion, we give the essential condition for the knapsack problem over Z_r against the existing quantum algorithm attacks, i.e. r<O(2^n). Then we analyze the security of the Chor-Rivest public-key crypto.
[ { "created": "Mon, 24 Feb 2014 15:31:48 GMT", "version": "v1" } ]
2014-02-28
[ [ "Fu", "Xiangqun", "" ], [ "Bao", "Wansu", "" ], [ "Shi", "Jianhong", "" ], [ "Li", "Fada", "" ], [ "Zhang", "Yuchao", "" ] ]
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1402.7033
Johan Hansson
Johan Hansson
Physical Origin of Elementary Particle Masses
18 pages
EJTP 11, No. 30 (2014) 87-100
null
null
physics.gen-ph hep-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In contemporary particle physics, the masses of fundamental particles are incalculable constants, being supplied by experimental values. Inspired by observation of the empirical particle mass spectrum, and their corresponding physical interaction couplings, we propose that the masses of elementary particles arise solely due to the self-interaction of the fields associated with the charges of a particle. A first application of this idea is seen to yield correct order of magnitude predictions for neutrinos, charged leptons and quarks. We then discuss more ambitious models, where also different generations may arise from \textit{e.g.} self-organizing bifurcations due to the underlying non-linear dynamics, with the coupling strength acting as "non-linearity" parameter. If the model is extended to include gauge bosons, the photon is automatically the only fundamental particle to remain massless as it has no charges. It results that gluons have an effective range $\sim 1$fm, physically explaining why QCD has finite reach.
[ { "created": "Tue, 4 Feb 2014 11:33:45 GMT", "version": "v1" } ]
2014-02-28
[ [ "Hansson", "Johan", "" ] ]
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1402.7035
Patrick Butler
Naren Ramakrishnan, Patrick Butler, Sathappan Muthiah, Nathan Self, Rupinder Khandpur, Parang Saraf, Wei Wang, Jose Cadena, Anil Vullikanti, Gizem Korkmaz, Chris Kuhlman, Achla Marathe, Liang Zhao, Ting Hua, Feng Chen, Chang-Tien Lu, Bert Huang, Aravind Srinivasan, Khoa Trinh, Lise Getoor, Graham Katz, Andy Doyle, Chris Ackermann, Ilya Zavorin, Jim Ford, Kristen Summers, Youssef Fayed, Jaime Arredondo, Dipak Gupta, David Mares
'Beating the news' with EMBERS: Forecasting Civil Unrest using Open Source Indicators
null
null
null
null
cs.SI cs.CY physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We describe the design, implementation, and evaluation of EMBERS, an automated, 24x7 continuous system for forecasting civil unrest across 10 countries of Latin America using open source indicators such as tweets, news sources, blogs, economic indicators, and other data sources. Unlike retrospective studies, EMBERS has been making forecasts into the future since Nov 2012 which have been (and continue to be) evaluated by an independent T&E team (MITRE). Of note, EMBERS has successfully forecast the uptick and downtick of incidents during the June 2013 protests in Brazil. We outline the system architecture of EMBERS, individual models that leverage specific data sources, and a fusion and suppression engine that supports trading off specific evaluation criteria. EMBERS also provides an audit trail interface that enables the investigation of why specific predictions were made along with the data utilized for forecasting. Through numerous evaluations, we demonstrate the superiority of EMBERS over baserate methods and its capability to forecast significant societal happenings.
[ { "created": "Thu, 27 Feb 2014 19:40:02 GMT", "version": "v1" }, { "created": "Fri, 28 Feb 2014 02:25:57 GMT", "version": "v2" } ]
2014-03-03
[ [ "Ramakrishnan", "Naren", "" ], [ "Butler", "Patrick", "" ], [ "Muthiah", "Sathappan", "" ], [ "Self", "Nathan", "" ], [ "Khandpur", "Rupinder", "" ], [ "Saraf", "Parang", "" ], [ "Wang", "Wei", "" ], [ "Cadena", "Jose", "" ], [ "Vullikanti", "Anil", "" ], [ "Korkmaz", "Gizem", "" ], [ "Kuhlman", "Chris", "" ], [ "Marathe", "Achla", "" ], [ "Zhao", "Liang", "" ], [ "Hua", "Ting", "" ], [ "Chen", "Feng", "" ], [ "Lu", "Chang-Tien", "" ], [ "Huang", "Bert", "" ], [ "Srinivasan", "Aravind", "" ], [ "Trinh", "Khoa", "" ], [ "Getoor", "Lise", "" ], [ "Katz", "Graham", "" ], [ "Doyle", "Andy", "" ], [ "Ackermann", "Chris", "" ], [ "Zavorin", "Ilya", "" ], [ "Ford", "Jim", "" ], [ "Summers", "Kristen", "" ], [ "Fayed", "Youssef", "" ], [ "Arredondo", "Jaime", "" ], [ "Gupta", "Dipak", "" ], [ "Mares", "David", "" ] ]
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1402.7037
Simon Lee Dettmer
Simon L Dettmer, Stefano Pagliara, Karolis Misiunas, Ulrich F Keyser
Anisotropic diffusion of spherical particles in closely confining microchannels
8 pages, 6 figures
Physical Review E, Vol.98, Issue 6, Article No. 062305, Year 2014
10.1103/PhysRevE.89.062305
null
physics.flu-dyn cond-mat.soft
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present here the measurement of the diffusivity of spherical particles closely confined by narrow microchannels. Our experiments yield a two-dimensional map of the position-dependent diffusion coefficients parallel and perpendicular to the channel axis with a resolution down to 129 nm. The diffusivity was measured simultaneously in the channel interior, the bulk reservoirs, as well as the channel entrance region. In the channel interior we found strongly anisotropic diffusion. While the perpendicular diffusion coefficient close to the confining walls decreased down to approximately 25% of the value on the channel axis, the parallel diffusion coefficient remained constant throughout the entire channel width. In addition to the experiment, we performed finite element simulations for the diffusivity in the channel interior and found good agreement with the measurements. Our results reveal the distinctive influence of strong confinement on Brownian motion, which is of significance to microfluidics as well as quantitative models of facilitated membrane transport.
[ { "created": "Thu, 27 Feb 2014 19:41:50 GMT", "version": "v1" }, { "created": "Thu, 19 Jun 2014 12:34:02 GMT", "version": "v2" } ]
2014-06-20
[ [ "Dettmer", "Simon L", "" ], [ "Pagliara", "Stefano", "" ], [ "Misiunas", "Karolis", "" ], [ "Keyser", "Ulrich F", "" ] ]
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1402.7050
Serena Ivaldi
Serena Ivaldi and Vincent Padois and Francesco Nori
Tools for dynamics simulation of robots: a survey based on user feedback
15 pages
null
null
null
cs.RO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The number of tools for dynamics simulation has grown in the last years. It is necessary for the robotics community to have elements to ponder which of the available tools is the best for their research. As a complement to an objective and quantitative comparison, difficult to obtain since not all the tools are open-source, an element of evaluation is user feedback. With this goal in mind, we created an online survey about the use of dynamical simulation in robotics. This paper reports the analysis of the participants' answers and a descriptive information fiche for the most relevant tools. We believe this report will be helpful for roboticists to choose the best simulation tool for their researches.
[ { "created": "Thu, 27 Feb 2014 20:13:28 GMT", "version": "v1" } ]
2014-02-28
[ [ "Ivaldi", "Serena", "" ], [ "Padois", "Vincent", "" ], [ "Nori", "Francesco", "" ] ]
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1402.7058
Dhrubaditya Mitra
Anupam Gupta (Uni of Rome and IISc), Dhrubaditya Mitra (NORDITA), Prasad Perlekar (TCIS), and Rahul Pandit (IISc)
Statistical Properties of the Intrinsic Geometry of Heavy-particle Trajectories in Two-dimensional, Homogeneous, Isotropic Turbulence
submitted to Phys. Rev. Lett. The supplementary information is added as an appendix
null
null
NORDITA-2014-2
physics.flu-dyn cond-mat.stat-mech math-ph math.MP physics.comp-ph
http://creativecommons.org/licenses/by/3.0/
We obtain, by extensive direct numerical simulations, trajectories of heavy inertial particles in two-dimensional, statistically steady, homogeneous, and isotropic turbulent flows, with friction. We show that the probability distribution function $\mathcal{P}(\kappa)$, of the trajectory curvature $\kappa$, is such that, as $\kappa \to \infty$, $\mathcal{P}(\kappa) \sim \kappa^{-h_{\rm r}}$, with $h_{\rm r} = 2.07 \pm 0.09$. The exponent $h_{\rm r}$ is universal, insofar as it is independent of the Stokes number ($\rm{St}$) and the energy-injection wave number. We show that this exponent lies within error bars of their counterparts for trajectories of Lagrangian tracers. We demonstrate that the complexity of heavy-particle trajectories can be characterized by the number $N_{\rm I}(t,{\rm St})$ of inflection points (up until time $t$) in the trajectory and $n_{\rm I} ({\rm St}) \equiv \lim_{t\to\infty} \frac{N_{\rm I} (t,{\rm St})}{t} \sim {\rm St}^{-\Delta}$, where the exponent $\Delta = 0.33 \pm0.02$ is also universal.
[ { "created": "Thu, 27 Feb 2014 20:30:36 GMT", "version": "v1" } ]
2014-03-05
[ [ "Gupta", "Anupam", "", "Uni of Rome and IISc" ], [ "Mitra", "Dhrubaditya", "", "NORDITA" ], [ "Perlekar", "Prasad", "", "TCIS" ], [ "Pandit", "Rahul", "", "IISc" ] ]
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1402.7060
Konrad Dabrowski
Konrad K. Dabrowski and Dani\"el Paulusma
Classifying the Clique-Width of $H$-Free Bipartite Graphs
13 pages, 4 figures
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null
null
cs.DM math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let $G$ be a bipartite graph, and let $H$ be a bipartite graph with a fixed bipartition $(B_H,W_H)$. We consider three different, natural ways of forbidding $H$ as an induced subgraph in $G$. First, $G$ is $H$-free if it does not contain $H$ as an induced subgraph. Second, $G$ is strongly $H$-free if $G$ is $H$-free or else has no bipartition $(B_G,W_G)$ with $B_H\subseteq B_G$ and $W_H\subseteq W_G$. Third, $G$ is weakly $H$-free if $G$ is $H$-free or else has at least one bipartition $(B_G,W_G)$ with $B_H\not\subseteq B_G$ or $W_H\not\subseteq W_G$. Lozin and Volz characterized all bipartite graphs $H$ for which the class of strongly $H$-free bipartite graphs has bounded clique-width. We extend their result by giving complete classifications for the other two variants of $H$-freeness.
[ { "created": "Thu, 27 Feb 2014 20:41:54 GMT", "version": "v1" } ]
2014-02-28
[ [ "Dabrowski", "Konrad K.", "" ], [ "Paulusma", "Daniël", "" ] ]
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1402.7063
Spyros Sioutas SS
Nikolaos Nodarakis, Spyros Sioutas, Dimitrios Tsoumakos, Giannis Tzimas and Evaggelia Pitoura
Rapid AkNN Query Processing for Fast Classification of Multidimensional Data in the Cloud
12 pages, 14 figures, 4 tables (it will be submitted to DEXA 2014)
null
null
null
cs.DB
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A $k$-nearest neighbor ($k$NN) query determines the $k$ nearest points, using distance metrics, from a specific location. An all $k$-nearest neighbor (A$k$NN) query constitutes a variation of a $k$NN query and retrieves the $k$ nearest points for each point inside a database. Their main usage resonates in spatial databases and they consist the backbone of many location-based applications and not only (i.e. $k$NN joins in databases, classification in data mining). So, it is very crucial to develop methods that answer them efficiently. In this work, we propose a novel method for classifying multidimensional data using an A$k$NN algorithm in the MapReduce framework. Our approach exploits space decomposition techniques for processing the classification procedure in a parallel and distributed manner. To our knowledge, we are the first to study the classification of multidimensional objects under this perspective. Through an extensive experimental evaluation we prove that our solution is efficient and scalable in processing the given queries. We investigate many different perspectives that can affect the total computational cost, such as different dataset distributions, number of dimensions, growth of $k$ value and granularity of space decomposition and prove that our system is efficient, robust and scalable.
[ { "created": "Thu, 27 Feb 2014 20:46:09 GMT", "version": "v1" } ]
2014-02-28
[ [ "Nodarakis", "Nikolaos", "" ], [ "Sioutas", "Spyros", "" ], [ "Tsoumakos", "Dimitrios", "" ], [ "Tzimas", "Giannis", "" ], [ "Pitoura", "Evaggelia", "" ] ]
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1402.7069
Pavel Polynkin
Craig Ament, Lee Johnson, Andreas Schmitt-Sody, Adrian Lucero, Thomas Milster, Pavel Polynkin
Generation of multi-terawatt vortex laser beams
13 pages, 7 figures
null
10.1364/AO.53.003355
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We report the fabrication of large-area phase masks on thin fused-silica substrates that are suitable for shaping multi-terawatt femtosecond laser beams. We apply these phase masks for the generation of intense femtosecond optical vortices. We further quantify distortions of the vortex beam patterns that result from several common types of mask defects.
[ { "created": "Thu, 27 Feb 2014 20:57:15 GMT", "version": "v1" } ]
2015-06-18
[ [ "Ament", "Craig", "" ], [ "Johnson", "Lee", "" ], [ "Schmitt-Sody", "Andreas", "" ], [ "Lucero", "Adrian", "" ], [ "Milster", "Thomas", "" ], [ "Polynkin", "Pavel", "" ] ]
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1402.7072
Hai Lin
H. Lin
Exact solutions of macroscopic self-consistent electromagnetic fields and microscopic distribution of Vlasov-Maxwell system
10 pages, 0 figure, 20 conferences
null
null
null
physics.plasm-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Strict mathematics reveals that the strict solution of a Vlasov-Maxwell equation set cannot be of a zero-temperature mathematical form. This universal property of Vlasov-Maxwell system can lead to a closed equation set of three macroscopic quantities: selfconsistent fields E, B and fluid velocity u, and hence their exact solutions.Strict solution of microscoipc distribution governed by self-consistent electromagnetic fields is found to be a universal extension of well-known BGK mode, which corresponds to electrostatic case.
[ { "created": "Thu, 27 Feb 2014 06:45:51 GMT", "version": "v1" } ]
2014-03-03
[ [ "Lin", "H.", "" ] ]
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1402.7089
Khanh Kieu
K. Kieu, D. Churin, E. M. Wright, R. A. Norwood, and N. Peyghambarian
Nonlinear stimulated Brillouin scattering in a single-mode optical fiber
null
null
null
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We predict and experimentally observe a nonlinear variant of stimulated Brillouin scattering in a single-mode fiber that arises from consideration of higher-order processes for phonon generation. The effect manifests itself at high laser excitation as the appearance of Stokes gain for a detuning equal to half of the conventional Brillouin frequency in the fiber, with no accompanying anti-Stokes absorption at the opposite detuning, and requires counter-propagating pump beams for phase-matching. We believe that this could be a new nonlinear optical effect that has not been observed before.
[ { "created": "Thu, 27 Feb 2014 21:17:38 GMT", "version": "v1" } ]
2014-03-03
[ [ "Kieu", "K.", "" ], [ "Churin", "D.", "" ], [ "Wright", "E. M.", "" ], [ "Norwood", "R. A.", "" ], [ "Peyghambarian", "N.", "" ] ]
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1402.7105
Jennifer Wise
Jennifer Wise, Sarah Loeb
Fool's Solitaire on Joins and Cartesian Products of Graphs
null
null
null
null
math.CO cs.DM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Peg solitaire is a game generalized to connected graphs by Beeler and Hoilman. In the game pegs are placed on all but one vertex. If $xyz$ form a 3-vertex path and $x$ and $y$ each have a peg but $z$ does not, then we can remove the pegs at $x$ and $y$ and place a peg at $z$. By analogy with the moves in the original game, this is called a jump. The goal of the peg solitaire game on graphs is to find jumps that reduce the number of pegs on the graph to 1. Beeler and Rodriguez proposed a variant where we instead want to maximize the number of pegs remaining when no more jumps can be made. Maximizing over all initial locations of a single hole, the maximum number of pegs left on a graph $G$ when no jumps remain is the fool's solitaire number $F(G)$. We determine the fool's solitaire number for the join of any graphs $G$ and $H$. For the cartesian product, we determine $F(G \Box K_k)$ when $k \ge 3$ and $G$ is connected and show why our argument fails when $k=2$. Finally, we give conditions on graphs $G$ and $H$ that imply $F(G \Box H) \ge F(G) F(H)$.
[ { "created": "Thu, 27 Feb 2014 23:09:18 GMT", "version": "v1" } ]
2014-03-03
[ [ "Wise", "Jennifer", "" ], [ "Loeb", "Sarah", "" ] ]
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1402.7107
Youhan Fang
Youhan Fang, Jesus-Maria Sanz-Serna and Robert D. Skeel
Compressible Generalized Hybrid Monte Carlo
27 pages, 2 figures
null
10.1063/1.4874000
null
physics.comp-ph stat.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
One of the most demanding calculations is to generate random samples from a specified probability distribution (usually with an unknown normalizing prefactor) in a high-dimensional configuration space. One often has to resort to using a Markov chain Monte Carlo method, which converges only in the limit to the prescribed distribution. Such methods typically inch through configuration space step by step, with acceptance of a step based on a Metropolis(-Hastings) criterion. An acceptance rate of 100% is possible in principle by embedding configuration space in a higher-dimensional phase space and using ordinary differential equations. In practice, numerical integrators must be used, lowering the acceptance rate. This is the essence of hybrid Monte Carlo methods. Presented is a general framework for constructing such methods under relaxed conditions: the only geometric property needed is (weakened) reversibility; volume preservation is not needed. The possibilities are illustrated by deriving a couple of explicit hybrid Monte Carlo methods, one based on barrier-lowering variable-metric dynamics and another based on isokinetic dynamics.
[ { "created": "Fri, 28 Feb 2014 00:01:07 GMT", "version": "v1" } ]
2015-06-18
[ [ "Fang", "Youhan", "" ], [ "Sanz-Serna", "Jesus-Maria", "" ], [ "Skeel", "Robert D.", "" ] ]
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1402.7110
Joseph Calvey
J.R. Calvey, G. Dugan, W. Hartung, J.A. Livezey, J. Makita, M.A. Palmer
Measurement and Modeling of Electron Cloud in a Field Free Environment Using Retarding Field Analyzers
null
null
10.1103/PhysRevSTAB.17.061001
null
physics.acc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
As part of the CESR-TA program at Cornell, diagnostic devices to measure and quantify the electron cloud effect have been installed throughout the CESR ring. One such device is the Retarding Field Analyzer (RFA), which provides information on the local electron cloud density and energy distribution. In a magnetic field free environment, RFA measurements can be directly compared with simulation to study the growth and dynamics of the cloud on a quantitative level. In particular, the photoemission and secondary emission characteristics of the instrumented chambers can be determined simultaneously.
[ { "created": "Fri, 28 Feb 2014 00:09:50 GMT", "version": "v1" }, { "created": "Tue, 1 Apr 2014 15:51:41 GMT", "version": "v2" } ]
2015-06-18
[ [ "Calvey", "J. R.", "" ], [ "Dugan", "G.", "" ], [ "Hartung", "W.", "" ], [ "Livezey", "J. A.", "" ], [ "Makita", "J.", "" ], [ "Palmer", "M. A.", "" ] ]
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1402.7111
Slava G. Turyshev
Slava G. Turyshev, Mikhail V. Sazhin, and Viktor T. Toth
General relativistic laser interferometric observables of the GRACE-Follow-On mission
29 pages, 2 figures, revtex4
Phys. Rev. D 89, 105029 (2014)
10.1103/PhysRevD.89.105029
null
gr-qc astro-ph.EP physics.geo-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We develop a high-precision model for laser ranging interferometric (LRI) observables of the GRACE Follow-On (GRACE-FO) mission. For this, we study the propagation of an electromagnetic wave in the gravitational field in the vicinity of an extended body, in the post-Newtonian approximation of the general theory of relativity. We present a general relativistic model for the phase of a plane wave that accounts for contributions of all the multipoles of the gravitating body, its angular momentum, as well as the contribution of tidal fields produced by external sources. We develop a new approach to model a coherent signal transmission in the gravitational field of the solar system that relies on a relativistic treatment of the phase. We use this approach to describe high-precision interferometric measurements on GRACE-FO and formulate the key LRI observables, namely the phase and phase rate of a coherent laser link between the two spacecraft. We develop a relativistic model for the LRI-enabled range between the two GRACE-FO spacecraft, accurate to less than 1 nm, and a high-precision model for the corresponding range rate, accurate to better than 0.1 nm/s. We also formulate high-precision relativistic models for the double one-way range (DOWR) and DOWR-enabled range rate observables originally used on GRACE and now studied for interferometric measurements on GRACE-FO. Our formulation justifies the basic assumptions behind the design of the GRACE-FO mission and highlights the importance of achieving nearly circular and nearly identical orbits for the GRACE-FO spacecraft.
[ { "created": "Fri, 28 Feb 2014 00:22:40 GMT", "version": "v1" } ]
2014-05-29
[ [ "Turyshev", "Slava G.", "" ], [ "Sazhin", "Mikhail V.", "" ], [ "Toth", "Viktor T.", "" ] ]
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1402.7113
Mohammad Mirhosseini
Mohammad Mirhosseini, Omar S. Maga\~na-Loaiza, Malcolm N. O'Sullivan, Brandon Rodenburg, Mehul Malik, Martin P. J. Lavery, Miles J. Padgett, Daniel J. Gauthier, and Robert W. Boyd
High-dimensional quantum cryptography with twisted light
null
New J. Phys. 17, 033033 (2015)
10.1088/1367-2630/17/3/033033
null
quant-ph physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Quantum key distributions (QKD) systems often rely on polarization of light for encoding, thus limiting the amount of information that can be sent per photon and placing tight bounds on the error that such a system can tolerate. Here we describe a proof-of-principle experiment that indicates the feasibility of high-dimensional QKD based on the transverse structure of the light field, allowing for the transfer of more than 1 bit per photon. Our implementation uses the orbital angular momentum (OAM) of photons and the corresponding mutually unbiased basis of angular position (ANG). Our experiment uses a digital micro-mirror device for the rapid generation of OAM and ANG modes at 4 kHz, and a mode sorter capable of sorting single photons based on their OAM and ANG content with a separation efficiency of 93\%. Through the use of a 7-dimensional alphabet encoded in the OAM and ANG bases, we achieve a channel capacity of 2.05 bits per sifted photon. Our experiment shows that, in addition to having an increased information capacity, QKD systems based on spatial-mode encoding will be more tolerant to errors and thus more robust against eavesdropping attacks.
[ { "created": "Fri, 28 Feb 2014 00:52:56 GMT", "version": "v1" }, { "created": "Mon, 6 Oct 2014 22:04:48 GMT", "version": "v2" } ]
2015-03-23
[ [ "Mirhosseini", "Mohammad", "" ], [ "Magaña-Loaiza", "Omar S.", "" ], [ "O'Sullivan", "Malcolm N.", "" ], [ "Rodenburg", "Brandon", "" ], [ "Malik", "Mehul", "" ], [ "Lavery", "Martin P. J.", "" ], [ "Padgett", "Miles J.", "" ], [ "Gauthier", "Daniel J.", "" ], [ "Boyd", "Robert W.", "" ] ]
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1402.7118
Michael Clear
Michael Clear and Constantinos Patsakis and Paul Laird
Lightweight Self-Bootstrapping Multiparty Computations of Time-Series Data with Custom Collusion Tolerance
preprint, 14 pages
null
null
null
cs.CR
http://creativecommons.org/licenses/by-nc-sa/3.0/
In this work we compare two recent multiparty computation (MPC) protocols for private summation in terms of performance. Both protocols allow multiple rounds of aggregation from the same set of public keys generated by parties in an initial stage. We instantiate the protocols with a fast elliptic curve and provide an experimental comparison of their performance for different phases of the protocol. Furthermore, we introduce a technique that allows the computational load of both protocols to be reduced at the expense of protection against collusion tolerance. We prove that both protocols remain secure with this technique, and evaluate its impact on collusion tolerance and the number of rounds supported.
[ { "created": "Fri, 28 Feb 2014 01:37:33 GMT", "version": "v1" } ]
2014-03-03
[ [ "Clear", "Michael", "" ], [ "Patsakis", "Constantinos", "" ], [ "Laird", "Paul", "" ] ]
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1402.7122
Anonymous Anonymous Mr.
Meghyn Bienvenu, Diego Calvanese, Magdalena Ortiz, Mantas Simkus
Nested Regular Path Queries in Description Logics
added Figure 1
null
null
null
cs.LO cs.AI cs.DB
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Two-way regular path queries (2RPQs) have received increased attention recently due to their ability to relate pairs of objects by flexibly navigating graph-structured data. They are present in property paths in SPARQL 1.1, the new standard RDF query language, and in the XML query language XPath. In line with XPath, we consider the extension of 2RPQs with nesting, which allows one to require that objects along a path satisfy complex conditions, in turn expressed through (nested) 2RPQs. We study the computational complexity of answering nested 2RPQs and conjunctions thereof (CN2RPQs) in the presence of domain knowledge expressed in description logics (DLs). We establish tight complexity bounds in data and combined complexity for a variety of DLs, ranging from lightweight DLs (DL-Lite, EL) up to highly expressive ones. Interestingly, we are able to show that adding nesting to (C)2RPQs does not affect worst-case data complexity of query answering for any of the considered DLs. However, in the case of lightweight DLs, adding nesting to 2RPQs leads to a surprising jump in combined complexity, from P-complete to Exp-complete.
[ { "created": "Fri, 28 Feb 2014 02:52:57 GMT", "version": "v1" }, { "created": "Tue, 4 Mar 2014 18:18:00 GMT", "version": "v2" } ]
2014-03-05
[ [ "Bienvenu", "Meghyn", "" ], [ "Calvanese", "Diego", "" ], [ "Ortiz", "Magdalena", "" ], [ "Simkus", "Mantas", "" ] ]
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1402.7123
Li Heting
Li Heting and Jia Qika
Optimization of single-step tapering amplitude and energy detuning for high-gain FELs
4 pages,3figures,1 table
null
null
null
physics.acc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We put forward a method to optimize the step-tapering amplitude of undulator strength and initial energy detuning of electron beam with the goal of maximizing the saturation power of high-gain FELs, based on the physics of longitudinal electron beam phase space. Using the FEL simulation code GENESIS, we numerically demonstrate the accuracy of the estimation for parameters corresponding to the linac coherent light source and the Tesla test facility.
[ { "created": "Fri, 28 Feb 2014 03:19:34 GMT", "version": "v1" } ]
2014-03-03
[ [ "Heting", "Li", "" ], [ "Qika", "Jia", "" ] ]
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1402.7125
Peixiang Lu
Meiyan Qin, Xiaosong Zhu, Yang Li, Qingbin Zhang, Pengfei Lan, and Peixiang Lu
Probing rotational wave-packet dynamics with the structural minimum in high-order harmonic spectra
null
Optics Express, Vol. 22, Issue 6, pp. 6362-6371 (2014)
10.1364/OE.22.006362
null
physics.atom-ph physics.chem-ph physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We investigate the alignment-dependent high-order harmonic spectrum generated from nonadiabatically aligned molecules around the first half rotational revival. It is found that the evolution of the molecular alignment is encoded in the structural minima. To reveal the relation between the molecular alignment and the structural minimum in the high-order harmonic spectrum, we perform an analysis based on the two-center interference model. Our analysis shows that the structural minimum position depends linearly on the inverse of the alignment parameter $<\cos^2\theta>$. This linear relation indicates the possibility of probing the rotational wave-packet dynamics by measuring the spectral minima.
[ { "created": "Fri, 28 Feb 2014 03:44:51 GMT", "version": "v1" }, { "created": "Tue, 4 Mar 2014 01:56:29 GMT", "version": "v2" } ]
2014-03-13
[ [ "Qin", "Meiyan", "" ], [ "Zhu", "Xiaosong", "" ], [ "Li", "Yang", "" ], [ "Zhang", "Qingbin", "" ], [ "Lan", "Pengfei", "" ], [ "Lu", "Peixiang", "" ] ]
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1402.7127
Mo Li
Nathan Youngblood, Yoska Anugrah, Rui Ma, Steven J. Koester, and Mo Li
Multifunctional graphene optical modulator and photodetector integrated on silicon waveguides
18 pages, 4 figures
null
10.1021/nl500712u
null
physics.optics cond-mat.mes-hall
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
For optical communication, information is converted between optical and electrical signal domains at a high rate. The devices to achieve such a conversion are various types of electro-optical modulators and photodetectors. These two types of optoelectronic devices, equally important, require different materials and consequently it has been challenging to realize both using a single material combination, especially in a way that can be integrated on the ubiquitous silicon platform. Graphene, with its gapless band structure, stands out as a unique optoelectronic material that allows both photodetection and optical modulation. Here, we demonstrate a single graphene-based device that simultaneously provides both efficient optical modulation and photodetection. The graphene device is integrated on a silicon waveguide and is tunable with a gate made from another layer of graphene to achieve near-infrared photodetection responsivity of 57 mA/W and modulation depth of 64%. This novel multifunctional device may lead to many unprecedented optoelectronic applications.
[ { "created": "Fri, 28 Feb 2014 03:59:20 GMT", "version": "v1" } ]
2015-06-18
[ [ "Youngblood", "Nathan", "" ], [ "Anugrah", "Yoska", "" ], [ "Ma", "Rui", "" ], [ "Koester", "Steven J.", "" ], [ "Li", "Mo", "" ] ]
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1402.7131
Leon Abdillah
Pesos Umami, Leon Andretti Abdillah, Ilman Zuhri Yadi
Sistem pendukung keputusan pemberian beasiswa bidik misi
Konferensi Nasional Sistem Informasi (KNSI), STMIK Dipanegara Makassar, Sulawesi Selatan, 2014
P. Umami, et al., "Sistem penunjang keputusan pemberian beasiswa bidik misi," in Konferensi Nasional Sistem Informasi (KNSI), STMIK Dipanegara Makassar, Sulawesi Selatan, 2014
null
null
cs.CY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Decision support systems (DSS) have been used in many applications to speed up decision making. This article will discuss the implementation of DSS for decision-making for scholarships "bidik misi". In terms of processing data related to the bidik misi scholarship are accordance with the regulations set by UBD. To facilitate the selection process of bidik misi scholarship then the authors used SAW method. The criteria for this scholarship involves academic achievement index, parents income, parents dependents number, semester, etc. Author also used waterfall model approach to developed the systems. The result is a decision support system that able to help decisions making quickly and in accordance with the rules of bidik misi scholarship.
[ { "created": "Fri, 28 Feb 2014 04:56:09 GMT", "version": "v1" } ]
2014-03-03
[ [ "Umami", "Pesos", "" ], [ "Abdillah", "Leon Andretti", "" ], [ "Yadi", "Ilman Zuhri", "" ] ]
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1402.7136
Peter Benes Ing.
Peter Mark Benes, Ivo Bukovsky, Matous Cejnek and Jan Kalivoda
Neural Network Approach to Railway Stand Lateral Skew Control
P. M. Benes et al., "Neural Network Approach to Railway Stand Lateral Skew Control" in Computer Science & Information Technology (CS& IT), Sydney, NSW, Australia, AIRCC, 2014, pp. 327-339
null
null
null
cs.SY cs.NE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The paper presents a study of an adaptive approach to lateral skew control for an experimental railway stand. The preliminary experiments with the real experimental railway stand and simulations with its 3-D mechanical model, indicates difficulties of model-based control of the device. Thus, use of neural networks for identification and control of lateral skew shall be investigated. This paper focuses on real-data based modeling of the railway stand by various neural network models, i.e; linear neural unit and quadratic neural unit architectures. Furthermore, training methods of these neural architectures as such, real-time-recurrent-learning and a variation of back-propagation-through-time are examined, accompanied by a discussion of the produced experimental results.
[ { "created": "Fri, 28 Feb 2014 05:34:36 GMT", "version": "v1" } ]
2014-03-03
[ [ "Benes", "Peter Mark", "" ], [ "Bukovsky", "Ivo", "" ], [ "Cejnek", "Matous", "" ], [ "Kalivoda", "Jan", "" ] ]
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1402.7137
Adam Anderson
R. Agnese, A.J. Anderson, M. Asai, D. Balakishiyeva, R. Basu Thakur, D.A. Bauer, J. Beaty, J. Billard, A. Borgland, M.A. Bowles, D. Brandt, P.L. Brink, R. Bunker, B. Cabrera, D.O. Caldwell, D.G. Cerdeno, H. Chagani, Y. Chen, M. Cherry, J. Cooley, B. Cornell, C.H. Crewdson, P. Cushman, M. Daal, D. DeVaney, P.C.F. Di Stefano, E. Do Couto E Silva, T. Doughty, L. Esteban, S. Fallows, E. Figueroa-Feliciano, G.L. Godfrey, S.R. Golwala, J. Hall, S. Hansen, H.R. Harris, S.A. Hertel, B.A. Hines, T. Hofer, D. Holmgren, L. Hsu, M.E. Huber, A. Jastram, O. Kamaev, B. Kara, M.H. Kelsey, S. Kenany, A. Kennedy, M. Kiveni, K. Koch, A. Leder, B. Loer, E. Lopez Asamar, R. Mahapatra, V. Mandic, C. Martinez, K.A. McCarthy, N. Mirabolfathi, R.A. Moffatt, R.H. Nelson, L. Novak, K. Page, R. Partridge, M. Pepin, A. Phipps, M. Platt, K. Prasad, M. Pyle, H. Qiu, W. Rau, P. Redl, A. Reisetter, R.W. Resch, Y. Ricci, M. Ruschman, T. Saab, B. Sadoulet, J. Sander, R.L. Schmitt, K. Schneck, R.W. Schnee, S. Scorza, D.N. Seitz, B. Serfass, B. Shank, D. Speller, A. Tomada, S. Upadhyayula, A.N. Villano, B. Welliver, D.H. Wright, S. Yellin, J.J. Yen, B.A. Young, J. Zhang
Search for Low-Mass WIMPs with SuperCDMS
6 pages, 4 figures; figure 1 updated, submitted to Phys. Rev. Lett
Phys. Rev. Lett. 112, 241302 (2014)
10.1103/PhysRevLett.112.241302
null
hep-ex astro-ph.CO physics.ins-det
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We report a first search for weakly interacting massive particles (WIMPs) using the background rejection capabilities of SuperCDMS. An exposure of 577 kg-days was analyzed for WIMPs with mass < 30 GeV/c2, with the signal region blinded. Eleven events were observed after unblinding. We set an upper limit on the spin-independent WIMP-nucleon cross section of 1.2e-42 cm2 at 8 GeV/c2. This result is in tension with WIMP interpretations of recent experiments and probes new parameter space for WIMP-nucleon scattering for WIMP masses < 6 GeV/c2.
[ { "created": "Fri, 28 Feb 2014 05:37:11 GMT", "version": "v1" }, { "created": "Wed, 12 Mar 2014 22:59:19 GMT", "version": "v2" } ]
2014-06-25
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1402.7142
Xavier Caruso
Xavier Caruso (IRMAR), David Roe, Tristan Vaccon (IRMAR)
Tracking p-adic precision
null
null
10.1112/S1461157014000357
null
math.NT cs.SC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a new method to propagate $p$-adic precision in computations, which also applies to other ultrametric fields. We illustrate it with many examples and give a toy application to the stable computation of the SOMOS 4 sequence.
[ { "created": "Fri, 28 Feb 2014 06:12:22 GMT", "version": "v1" } ]
2014-08-13
[ [ "Caruso", "Xavier", "", "IRMAR" ], [ "Roe", "David", "", "IRMAR" ], [ "Vaccon", "Tristan", "", "IRMAR" ] ]
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1402.7143
Ashwin Rajadesingan
Ashwin Rajadesingan and Huan Liu
Identifying Users with Opposing Opinions in Twitter Debates
Corrected typos in Section 4, under "Visibly Opinionated Users". The numbers did not add up. Results remain unchanged
Lecture Notes in Computer Science, Vol. 8393, 2014
null
null
cs.SI cs.CY physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In recent times, social media sites such as Twitter have been extensively used for debating politics and public policies. These debates span millions of tweets and numerous topics of public importance. Thus, it is imperative that this vast trove of data is tapped in order to gain insights into public opinion especially on hotly contested issues such as abortion, gun reforms etc. Thus, in our work, we aim to gauge users' stance on such topics in Twitter. We propose ReLP, a semi-supervised framework using a retweet-based label propagation algorithm coupled with a supervised classifier to identify users with differing opinions. In particular, our framework is designed such that it can be easily adopted to different domains with little human supervision while still producing excellent accuracy
[ { "created": "Fri, 28 Feb 2014 06:12:27 GMT", "version": "v1" }, { "created": "Thu, 10 Apr 2014 16:12:35 GMT", "version": "v2" } ]
2014-04-11
[ [ "Rajadesingan", "Ashwin", "" ], [ "Liu", "Huan", "" ] ]
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1402.7146
Sumei Huang
Sumei Huang and G. S. Agarwal
Coherent perfect absorption of path entangled single photons
12 pages, 6 figures
Optics Express 22, 20936 (2014)
10.1364/OE.22.020936
null
physics.optics quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We examine the question of coherent perfect absorption (CPA) of single photons, and more generally, of the quantum fields by a {\it macroscopic} medium. We show the CPA of path entangled single photons in a Fabry-Perot interferometer containing an absorptive medium. The frequency of perfect absorption can be controlled by changing the interferometer parameters like the reflectivity and the complex dielectric constant of the material. We exhibit similar results for path entangled photons in micro-ring resonators. For entangled fields like the ones produced by a down converter the CPA aspect is evident in phase sensitive detection schemes such as in measurements of the squeezing spectrum.
[ { "created": "Fri, 28 Feb 2014 06:42:59 GMT", "version": "v1" }, { "created": "Fri, 22 Aug 2014 16:22:34 GMT", "version": "v2" } ]
2015-06-18
[ [ "Huang", "Sumei", "" ], [ "Agarwal", "G. S.", "" ] ]
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1402.7150
Mukund Raghothaman
Rajeev Alur, Milo Martin, Mukund Raghothaman, Christos Stergiou, Stavros Tripakis, Abhishek Udupa
Synthesizing Finite-state Protocols from Scenarios and Requirements
This is the working draft of a paper currently in submission. (February 10, 2014)
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cs.FL cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Scenarios, or Message Sequence Charts, offer an intuitive way of describing the desired behaviors of a distributed protocol. In this paper we propose a new way of specifying finite-state protocols using scenarios: we show that it is possible to automatically derive a distributed implementation from a set of scenarios augmented with a set of safety and liveness requirements, provided the given scenarios adequately \emph{cover} all the states of the desired implementation. We first derive incomplete state machines from the given scenarios, and then synthesis corresponds to completing the transition relation of individual processes so that the global product meets the specified requirements. This completion problem, in general, has the same complexity, PSPACE, as the verification problem, but unlike the verification problem, is NP-complete for a constant number of processes. We present two algorithms for solving the completion problem, one based on a heuristic search in the space of possible completions and one based on OBDD-based symbolic fixpoint computation. We evaluate the proposed methodology for protocol specification and the effectiveness of the synthesis algorithms using the classical alternating-bit protocol.
[ { "created": "Fri, 28 Feb 2014 07:15:00 GMT", "version": "v1" } ]
2014-03-03
[ [ "Alur", "Rajeev", "" ], [ "Martin", "Milo", "" ], [ "Raghothaman", "Mukund", "" ], [ "Stergiou", "Christos", "" ], [ "Tripakis", "Stavros", "" ], [ "Udupa", "Abhishek", "" ] ]
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1402.7162
Hamdi Yalin Yalic
Hamdi Yalin Yalic
Visual Saliency Model using SIFT and Comparison of Learning Approaches
8 pages, 6 figures, 2 tables
Computer Science & Information Technology, Volume 4, Number 2, 2014, page 275-282
10.5121/csit.2014.4223
null
cs.CV
http://creativecommons.org/licenses/by-nc-sa/3.0/
Humans' ability to detect and locate salient objects on images is remarkably fast and successful. Performing this process by using eye tracking equipment is expensive and cannot be easily applied, and computer modeling of this human behavior is still a problem to be solved. In our study, one of the largest public eye-tracking databases which has fixation points of 15 observers on 1003 images is used. In addition to low, medium and high-level features which have been used in previous studies, SIFT features extracted from the images are used to improve the classification accuracy of the models. A second contribution of this paper is the comparison and statistical analysis of different machine learning methods that can be used to train our model. As a result, a best feature set and learning model to predict where humans look at images, is determined.
[ { "created": "Fri, 28 Feb 2014 08:33:17 GMT", "version": "v1" } ]
2014-03-03
[ [ "Yalic", "Hamdi Yalin", "" ] ]
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1402.7170
Pablo Martinez Olmos
Pablo M. Olmos, David G. M. Mitchell, Dmitri Truhachev, Daniel J. Costello Jr
Improving the Finite-Length Performance of Spatially Coupled LDPC Codes by Connecting Multiple Code Chains
Submitted to IEEE Transactions on Information Theory, February 2014
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null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we analyze the finite-length performance of codes on graphs constructed by connecting spatially coupled low-density parity-check (SC-LDPC) code chains. Successive (peeling) decoding is considered for the binary erasure channel (BEC). The evolution of the undecoded portion of the bipartite graph remaining after each iteration is analyzed as a dynamical system. When connecting short SC-LDPC chains, we show that, in addition to superior iterative decoding thresholds, connected chain ensembles have better finite-length performance than single chain ensembles of the same rate and length. In addition, we present a novel encoding/transmission scheme to improve the performance of a system using long SC-LDPC chains, where, instead of transmitting codewords corresponding to a single SC-LDPC chain independently, we connect consecutive chains in a multi-layer format to form a connected chain ensemble. We refer to such a transmission scheme to as continuous chain (CC) transmission of SC-LDPC codes. We show that CC transmission can be implemented with no significant increase in encoding/decoding complexity or decoding delay with respect a system using a single SC-LDPC code chain for encoding.
[ { "created": "Fri, 28 Feb 2014 09:10:34 GMT", "version": "v1" } ]
2014-03-03
[ [ "Olmos", "Pablo M.", "" ], [ "Mitchell", "David G. M.", "" ], [ "Truhachev", "Dmitri", "" ], [ "Costello", "Daniel J.", "Jr" ] ]
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1402.7182
Michael Bonitz
Hauke Thomsen, Patrick Ludwig, Michael Bonitz, Jan Schablinski, Dietmar Block, Andr\'e Schella and Andr\'e Melzer
Controlling strongly correlated dust clusters with lasers
null
Journal of Physics D: Appl. Phys. 47, 383001 (2014)
10.1088/0022-3727/47/38/383001
null
physics.plasm-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The most attractive feature of dusty plasmas is the possibility to create strong correlations at room temperatures. At the same time, these plasmas allow for a precise diagnostics with single-particle resolution. From such measurements, the structural properties of finite two-dimensional (2D) clusters and three-dimensional (3D) spherical crystals in nearly harmonic traps-Yukawa balls-have been explored in great detail. Their structural properties-the shell compositions and the order within the shells-have been investigated and good agreement to theoretical predictions was found. Open questions on the agenda are the excitation behavior, the structural changes, and phase transitions that occur at elevated temperature. In order to increase the dust temperature in the experiment various techniques have been used. Among them, laser heating appears to have unique capabilities because it affects only the dust particles, leaving the lighter plasma components unchanged. Here we report on recent experimental results where laser heating methods were further improved and applied to finite 2D and 3D clusters. Comparing to simulations, we demonstrate that this indeed allows to increase the temperature in a controlled manner. For the analysis of thermodynamics and phase transitions in these finite systems, we present theoretical and experimental results on the basis of the instantaneous normal modes, pair distribution function and the recently introduced center-two-particle distribution function.
[ { "created": "Fri, 28 Feb 2014 10:05:10 GMT", "version": "v1" }, { "created": "Mon, 7 Jul 2014 07:03:41 GMT", "version": "v2" } ]
2014-09-09
[ [ "Thomsen", "Hauke", "" ], [ "Ludwig", "Patrick", "" ], [ "Bonitz", "Michael", "" ], [ "Schablinski", "Jan", "" ], [ "Block", "Dietmar", "" ], [ "Schella", "André", "" ], [ "Melzer", "André", "" ] ]
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1402.7184
Edvin Wedin
Edvin Wedin and Peter Hegarty
The Hegselmann-Krause dynamics for continuous agents and a regular opinion function do not always lead to consensus
11 pages, 3 figures
null
null
null
math.DS cs.SI cs.SY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present an example of a regular opinion function which, as it evolves in accordance with the discrete-time Hegselmann-Krause bounded confidence dynamics, always retains opinions which are separated by more than two. This confirms a conjecture of Blondel, Hendrickx and Tsitsiklis.
[ { "created": "Fri, 28 Feb 2014 10:21:00 GMT", "version": "v1" } ]
2014-03-03
[ [ "Wedin", "Edvin", "" ], [ "Hegarty", "Peter", "" ] ]
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1402.7190
Venugopal K r
S kumarasawamy, Srikanth P L, Manjula S H, K R Venugopal, L M Patnaik
Two Stage Prediction Process with Gradient Descent Methods Aligning with the Data Privacy Preservation
14 pages
International Journal of Information Processing, 7(3), 68-82, 2013
null
null
cs.DB
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Privacy preservation emphasize on authorization of data, which signifies that data should be accessed only by authorized users. Ensuring the privacy of data is considered as one of the challenging task in data management. The generalization of data with varying concept hierarchies seems to be interesting solution. This paper proposes two stage prediction processes on privacy preserved data. The privacy is preserved using generalization and betraying other communicating parties by disguising generalized data which adds another level of privacy. The generalization with betraying is performed in first stage to define the knowledge or hypothesis and which is further optimized using gradient descent method in second stage prediction for accurate prediction of data. The experiment carried with both batch and stochastic gradient methods and it is shown that bulk operation performed by batch takes long time and more iterations than stochastic to give more accurate solution.
[ { "created": "Fri, 28 Feb 2014 10:36:16 GMT", "version": "v1" } ]
2014-03-03
[ [ "kumarasawamy", "S", "" ], [ "L", "Srikanth P", "" ], [ "H", "Manjula S", "" ], [ "Venugopal", "K R", "" ], [ "Patnaik", "L M", "" ] ]
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1402.7194
Jiulin Du
Yanjun Zhou, Jiulin Du
Escape rate for the power-law distribution in low-to-intermediate damping
15 pages, 2 figures
Physica A 403 (2014) 244
10.1016/j.physa.2014.02.022
null
cond-mat.stat-mech physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Escape rate in the low-to-intermediate damping connecting the low damping with the intermediate damping is established for the power-law distribution on the basis of flux over population theory. We extend the escape rate in the low damping to the low-to-intermediate damping, and get an expression for the power-law distribution. Then we apply the escape rate for the power-law distribution to the experimental study of the excited-state isomerization, and show a good agreement with the experimental value. The extra current and the improvement of the absorbing boundary condition are discussed.
[ { "created": "Fri, 28 Feb 2014 10:43:16 GMT", "version": "v1" }, { "created": "Mon, 3 Mar 2014 08:11:33 GMT", "version": "v2" } ]
2015-08-10
[ [ "Zhou", "Yanjun", "" ], [ "Du", "Jiulin", "" ] ]
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1402.7198
Venugopal K r
T Shiva Prakash, K B Raja, K R Venugopal, S S Iyengar, L M Patnaik
Two-Hop Routing with Traffic-Differentiation for QoS Guarantee in Wireless Sensor Networks
13 pages
International Journal of Information Processing, 7(3), 100-112, 2013
null
null
cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper proposes a Traffic-Differentiated Two-Hop Routing protocol for Quality of Service (QoS) in Wireless Sensor Networks (WSNs). It targets WSN applications having different types of data traffic with several priorities. The protocol achieves to increase Packet Reception Ratio (PRR) and reduce end-to-end delay while considering multi-queue priority policy, two-hop neighborhood information, link reliability and power efficiency. The protocol is modular and utilizes effective methods for estimating the link metrics. Numerical results show that the proposed protocol is a feasible solution to addresses QoS service differenti- ation for traffic with different priorities.
[ { "created": "Fri, 28 Feb 2014 10:45:59 GMT", "version": "v1" } ]
2014-03-03
[ [ "Prakash", "T Shiva", "" ], [ "Raja", "K B", "" ], [ "Venugopal", "K R", "" ], [ "Iyengar", "S S", "" ], [ "Patnaik", "L M", "" ] ]
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1402.7200
Venugopal K r
Leena Giri G, Srikanth P L, S H Manjula, K R Venugopal, L M Patnaik
Mathematical Model of Semantic Look - An Efficient Context Driven Search Engine
12 pages
International Journal of Information Processing, 7(2), 20-31, 2013
null
null
cs.IR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The WorldWideWeb (WWW) is a huge conservatory of web pages. Search Engines are key applications that fetch web pages for the user query. In the current generation web architecture, search engines treat keywords provided by the user as isolated keywords without considering the context of the user query. This results in a lot of unrelated pages or links being displayed to the user. Semantic Web is based on the current web with a revised framework to display a more precise result set as response to a user query. The current web pages need to be annotated by finding relevant meta data to be added to each of them, so that they become useful to Semantic Web search engines. Semantic Look explores the context of user query by processing the Semantic information recorded in the web pages. It is compared with an existing algorithm called OntoLook and it is shown that Semantic Look is a better optimized search engine by being more than twice as fast as OntoLook.
[ { "created": "Fri, 28 Feb 2014 10:55:24 GMT", "version": "v1" } ]
2014-03-03
[ [ "G", "Leena Giri", "" ], [ "L", "Srikanth P", "" ], [ "Manjula", "S H", "" ], [ "Venugopal", "K R", "" ], [ "Patnaik", "L M", "" ] ]
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1402.7201
Eugene Kazantsev
Eugene Kazantsev (INRIA Grenoble Rh\^one-Alpes / LJK Laboratoire Jean Kuntzmann)
Optimal boundary conditions at the staircase-shaped coastlines
Submitted to Ocean Dynamics. (27/02/2014)
null
10.1007/s10236-014-0780-z
null
physics.ao-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A 4D-Var data assimilation technique is applied to the rectangular-box configuration of the NEMO in order to identify the optimal parametrization of boundary conditions at lateral boundaries. The case of the staircase-shaped coastlines is studied by rotating the model grid around the center of the box. It is shown that, in some cases, the formulation of the boundary conditions at the exact boundary leads to appearance of exponentially growing modes while optimal boundary conditions allow to correct the errors induced by the staircase-like appriximation of the coastline.
[ { "created": "Fri, 28 Feb 2014 10:57:43 GMT", "version": "v1" } ]
2015-06-18
[ [ "Kazantsev", "Eugene", "", "INRIA Grenoble Rhône-Alpes / LJK Laboratoire Jean\n Kuntzmann" ] ]
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1402.7202
Sebastien Tanzilli
Thomas Meany, Lutfi A. Ngah, Matthew J. Collins, Alex S. Clark, Robert J. Williams, Benjamin J. Eggleton, M. J. Steel, Michael J. Withford, Olivier Alibart, and S\'ebastien Tanzilli
Hybrid photonic circuit for multiplexed heralded single photons
5 pages, double column, 3 figures
Laser Photonics Rev. 8, No. 3, L42-L46 (2014)
10.1002/lpor.201400027
null
quant-ph physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A key resource for quantum optics experiments is an on-demand source of single and multiple photon states at telecommunication wavelengths. This letter presents a heralded single photon source based on a hybrid technology approach, combining high efficiency periodically poled lithium niobate waveguides, low-loss laser inscribed circuits, and fast (>1 MHz) fibre coupled electro-optic switches. Hybrid interfacing different platforms is a promising route to exploiting the advantages of existing technology and has permitted the demonstration of the multiplexing of four identical sources of single photons to one output. Since this is an integrated technology, it provides scalability and can immediately leverage any improvements in transmission, detection and photon production efficiencies.
[ { "created": "Fri, 28 Feb 2014 11:05:45 GMT", "version": "v1" } ]
2014-08-06
[ [ "Meany", "Thomas", "" ], [ "Ngah", "Lutfi A.", "" ], [ "Collins", "Matthew J.", "" ], [ "Clark", "Alex S.", "" ], [ "Williams", "Robert J.", "" ], [ "Eggleton", "Benjamin J.", "" ], [ "Steel", "M. J.", "" ], [ "Withford", "Michael J.", "" ], [ "Alibart", "Olivier", "" ], [ "Tanzilli", "Sébastien", "" ] ]
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1402.7205
Pierre-Jean Spaenlehauer
Jean-Charles Faugere (INRIA Paris-Rocquencourt), Pierre-Jean Spaenlehauer (INRIA Nancy - Grand Est / LORIA), Jules Svartz (INRIA Paris-Rocquencourt)
Sparse Gr\"obner Bases: the Unmixed Case
20 pages, Corollary 6.1 has been corrected, ISSAC 2014, Kobe : Japan (2014)
null
10.1145/2608628.2608663
null
cs.SC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Toric (or sparse) elimination theory is a framework developped during the last decades to exploit monomial structures in systems of Laurent polynomials. Roughly speaking, this amounts to computing in a \emph{semigroup algebra}, \emph{i.e.} an algebra generated by a subset of Laurent monomials. In order to solve symbolically sparse systems, we introduce \emph{sparse Gr\"obner bases}, an analog of classical Gr\"obner bases for semigroup algebras, and we propose sparse variants of the $F_5$ and FGLM algorithms to compute them. Our prototype "proof-of-concept" implementation shows large speed-ups (more than 100 for some examples) compared to optimized (classical) Gr\"obner bases software. Moreover, in the case where the generating subset of monomials corresponds to the points with integer coordinates in a normal lattice polytope $\mathcal P\subset\mathbb R^n$ and under regularity assumptions, we prove complexity bounds which depend on the combinatorial properties of $\mathcal P$. These bounds yield new estimates on the complexity of solving $0$-dim systems where all polynomials share the same Newton polytope (\emph{unmixed case}). For instance, we generalize the bound $\min(n_1,n_2)+1$ on the maximal degree in a Gr\"obner basis of a $0$-dim. bilinear system with blocks of variables of sizes $(n_1,n_2)$ to the multilinear case: $\sum n_i - \max(n_i)+1$. We also propose a variant of Fr\"oberg's conjecture which allows us to estimate the complexity of solving overdetermined sparse systems.
[ { "created": "Fri, 28 Feb 2014 11:24:10 GMT", "version": "v1" }, { "created": "Mon, 5 May 2014 19:01:28 GMT", "version": "v2" }, { "created": "Wed, 25 Jun 2014 15:42:46 GMT", "version": "v3" } ]
2014-06-26
[ [ "Faugere", "Jean-Charles", "", "INRIA Paris-Rocquencourt" ], [ "Spaenlehauer", "Pierre-Jean", "", "INRIA Nancy - Grand Est / LORIA" ], [ "Svartz", "Jules", "", "INRIA\n Paris-Rocquencourt" ] ]
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1402.7213
Eglantine Camby
Eglantine Camby and Oliver Schaudt
A new characterization of $P_k$-free graphs
13 pages, 4 figures
null
null
null
cs.DM math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The class of graphs that do not contain an induced path on $k$ vertices, $P_k$-free graphs, plays a prominent role in algorithmic graph theory. This motivates the search for special structural properties of $P_k$-free graphs, including alternative characterizations. Let $G$ be a connected $P_k$-free graph, $k \ge 4$. We show that $G$ admits a connected dominating set whose induced subgraph is either $P_{k-2}$-free, or isomorphic to $P_{k-2}$. Surprisingly, it turns out that every minimum connected dominating set of $G$ has this property. This yields a new characterization for $P_k$-free graphs: a graph $G$ is $P_k$-free if and only if each connected induced subgraph of $G$ has a connected dominating set whose induced subgraph is either $P_{k-2}$-free, or isomorphic to $C_k$. This improves and generalizes several previous results; the particular case of $k=7$ solves a problem posed by van 't Hof and Paulusma [A new characterization of $P_6$-free graphs, COCOON 2008]. In the second part of the paper, we present an efficient algorithm that, given a connected graph $G$ on $n$ vertices and $m$ edges, computes a connected dominating set $X$ of $G$ with the following property: for the minimum $k$ such that $G$ is $P_k$-free, the subgraph induced by $X$ is $P_{k-2}$-free or isomorphic to $P_{k-2}$. As an application our results, we prove that Hypergraph 2-Colorability, an NP-complete problem in general, can be solved in polynomial time for hypergraphs whose vertex-hyperedge incidence graph is $P_7$-free.
[ { "created": "Fri, 28 Feb 2014 11:50:27 GMT", "version": "v1" } ]
2014-03-03
[ [ "Camby", "Eglantine", "" ], [ "Schaudt", "Oliver", "" ] ]
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1402.7216
Jana Paz\'urikov\'a
Jana Paz\'urikov\'a
Large-Scale Molecular Dynamics Simulations for Highly Parallel Infrastructures
thesis proposal
null
null
null
cs.DC cs.CE physics.comp-ph
http://creativecommons.org/licenses/by-nc-sa/3.0/
Computational chemistry allows researchers to experiment in sillico: by running a computer simulations of a biological or chemical processes of interest. Molecular dynamics with molecular mechanics model of interactions simulates N-body problem of atoms$-$it computes movements of atoms according to Newtonian physics and empirical descriptions of atomic electrostatic interactions. These simulations require high performance computing resources, as evaluations within each step are computationally demanding and billions of steps are needed to reach interesting timescales. Current methods decompose the spatial domain of the problem and calculate on parallel/distributed infrastructures. Even the methods with the highest strong scaling hit the limit at half a million cores: they are not able to cut the time to result if provided with more processors. At the dawn of exascale computing with massively parallel computational resources, we want to increase the level of parallelism by incorporating parallel-in-time computation to molecular dynamics simulations. Calculation of results in several successive time points simultaneously without a priori knowledge has been examined with no major success. We will study and implement a novel combinations of methods that according to our theoretical analyses should achieve promising speed-up compared to sequential-in-time calculation.
[ { "created": "Fri, 28 Feb 2014 11:59:08 GMT", "version": "v1" } ]
2014-03-03
[ [ "Pazúriková", "Jana", "" ] ]
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1402.7217
Tobias Thiele
Tobias Thiele, Stefan Filipp, Josef Anton Agner, Hansj\"urg Schmutz, Johannes Deiglmayr, Mathias Stammeier, Pitt Allmendinger, Fr\'ed\'eric Merkt, Andreas Wallraff
Manipulating Rydberg atoms close to surfaces at cryogenic temperatures
12 pages, 10 figures
Phys. Rev. A 90, 013414 (2014)
10.1103/PhysRevA.90.013414
null
physics.atom-ph cond-mat.mes-hall quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Helium atoms in Rydberg states have been manipulated coherently with microwave radiation pulses near a gold surface and near a superconducting NbTiN surface at a temperature of $3 \text{K}$. The experiments were carried out with a skimmed supersonic beam of metastable $(1\text{s})^1(2\text{s})^1\, {}^1\text{S}_0$ helium atoms excited with laser radiation to $n\text{p}$ Rydberg levels with principal quantum number $n$ between $30$ and $40$. The separation between the cold surface and the center of the collimated beam is adjustable down to $250 \mu\text{m}$. Short-lived $n\text{p}$ Rydberg levels were coherently transferred to the long-lived $n\text{s}$ state to avoid radiative decay of the Rydberg atoms between the photoexcitation region and the region above the cold surfaces. Further coherent manipulation of the $n\text{s}$ Rydberg levels with pulsed microwave radiation above the surfaces enabled measurements of stray electric fields and allowed us to study the decoherence of the atomic ensemble. Adsorption of residual gas onto the surfaces and the resulting slow build-up of stray fields was minimized by controlling the temperature of the surface and monitoring the partial pressures of H$_2$O, N$_2$, O$_2$ and CO$_2$ in the experimental chamber during the cool-down. Compensation of the stray electric fields to levels below $100 \text{mV}/\text{cm}$ was achieved over a region of $6 \text{mm}$ along the beam-propagation direction which, for the $1770 \text{m}/\text{s}$ beam velocity, implies the possibility to preserve the coherence of the atomic sample for several microseconds above the cold surfaces.
[ { "created": "Fri, 28 Feb 2014 12:01:57 GMT", "version": "v1" } ]
2014-07-23
[ [ "Thiele", "Tobias", "" ], [ "Filipp", "Stefan", "" ], [ "Agner", "Josef Anton", "" ], [ "Schmutz", "Hansjürg", "" ], [ "Deiglmayr", "Johannes", "" ], [ "Stammeier", "Mathias", "" ], [ "Allmendinger", "Pitt", "" ], [ "Merkt", "Frédéric", "" ], [ "Wallraff", "Andreas", "" ] ]
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1402.7222
Xun-Wei Xu
Xun-Wei Xu, Yu-xi Liu, Chang-Pu Sun, and Yong Li
Mechanical PT symmetry in coupled optomechanical systems
12 pages, 11 figures
Phys. Rev. A 92, 013852 (2015)
10.1103/PhysRevA.92.013852
null
quant-ph cond-mat.mes-hall physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose to realize mechanical parity-time PT symmetry in two coupled optomechanical systems. To provide gain to one mechanical resonator and the same amount of damping to the other, the two optical cavities should be driven by blue- and red-detuned laser fields, respectively. After adiabatically eliminating the degrees of freedom of the cavity modes, we derive a formula to describe the PT symmetry of two coupled mechanical resonators. Mechanical PT-symmetric phase transition is demonstrated by the dynamical behavior of the mechanical resonators. Moreover, we study the effect of the quantum noises on the dynamical behavior of the mechanical resonators when the system is in the quantum regime.
[ { "created": "Fri, 28 Feb 2014 12:34:43 GMT", "version": "v1" }, { "created": "Fri, 14 Mar 2014 06:31:00 GMT", "version": "v2" }, { "created": "Thu, 5 Jun 2014 05:45:29 GMT", "version": "v3" }, { "created": "Mon, 3 Aug 2015 05:05:49 GMT", "version": "v4" } ]
2015-08-04
[ [ "Xu", "Xun-Wei", "" ], [ "Liu", "Yu-xi", "" ], [ "Sun", "Chang-Pu", "" ], [ "Li", "Yong", "" ] ]
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1402.7223
Henning Hasemann
Dennis Boldt, Henning Hasemann, Alexander Kr\"oller, Marcel Karnstedt, Christian von der Weth
SPARQL for Networks of Embedded Systems
null
null
null
null
cs.DB cs.DC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Semantic Web (or Web of Data) represents the successful efforts towards linking and sharing data over the Web. The cornerstones of the Web of Data are RDF as data format and SPARQL as de-facto standard query language. Recent trends show the evolution of the Web of Data towards the Web of Things, integrating embedded devices and smart objects. Data stemming from such devices do not share a common format, making the integration and querying impossible. To overcome this problem, we present our approach to make embedded systems first-class citizens of the Web of Things. Our framework abstracts from individual deployments to represent them as common data sources in line with the ideas behind the Semantic Web. This includes the execution of arbitrary SPARQL queries over the data from a pool of embedded devices and/or external data sources. Handling verbose RDF data and executing SPARQL queries in an embedded network poses major challenges to minimize the involved processing and communication cost. We therefore present an in-network query processor aiming to push processing steps onto devices. We demonstrate the practical application and the potential benefits of our framework in a comprehensive evaluation using a real-world deployment and a range of SPARQL queries stemming from a common use case of the Web of Things.
[ { "created": "Fri, 28 Feb 2014 12:36:12 GMT", "version": "v1" } ]
2014-03-03
[ [ "Boldt", "Dennis", "" ], [ "Hasemann", "Henning", "" ], [ "Kröller", "Alexander", "" ], [ "Karnstedt", "Marcel", "" ], [ "von der Weth", "Christian", "" ] ]
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1402.7224
Nela Lekic
Alexander Grigoriev, Steven Kelk, Nela Lekic
On low treewidth graphs and supertrees
null
null
null
null
cs.DM cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Compatibility of unrooted phylogenetic trees is a well studied problem in phylogenetics. It asks to determine whether for a set of k input trees there exists a larger tree (called a supertree) that contains the topologies of all k input trees. When any such supertree exists we call the instance compatible and otherwise incompatible. It is known that the problem is NP-hard and FPT, although a constructive FPT algorithm is not known. It has been shown that whenever the treewidth of an auxiliary structure known as the display graph is strictly larger than the number of input trees, the instance is incompatible. Here we show that whenever the treewidth of the display graph is at most 2, the instance is compatible. Furthermore, we give a polynomial-time algorithm to construct a supertree in this case. Finally, we demonstrate both compatible and incompatible instances that have display graphs with treewidth 3, highlighting that the treewidth of the display graph is (on its own) not sufficient to determine compatibility.
[ { "created": "Fri, 28 Feb 2014 12:37:40 GMT", "version": "v1" } ]
2014-03-03
[ [ "Grigoriev", "Alexander", "" ], [ "Kelk", "Steven", "" ], [ "Lekic", "Nela", "" ] ]
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1402.7228
Henning Hasemann
Henning Hasemann, Alexander Kr\"oller, Max Pagel
The Wiselib TupleStore: A Modular RDF Database for the Internet of Things
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cs.DB cs.DC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Internet of Things movement provides self-configuring and universally interoperable devices. While such devices are often built with a specific application in mind, they often turn out to be useful in other contexts as well. We claim that by describing the devices' knowledge in a universal way, IoT devices can become first-class citizens in the Internet. They can then exchange data between heterogeneous hardware, different applications and large data sources on the Web. Our key idea --- in contrast to most existing approaches --- is to not restrict the domain of knowledge that can be expressed on the device in any way and, at the same time, allow this knowledge to be machine-understandable and linkable across different locations. We propose an architecture that allows to connect embedded devices to the Semantic Web by expressing their knowledge in the Resource Description Framework (RDF). We present the Wiselib TupleStore, a modular embedded database tailored specifically for the storage of RDF. The Wiselib TupleStore is portable to many platforms including Contiki and TinyOS and allows a variety of trade-offs, making it able to scale to a large variety of hardware scenarios. We discuss the applicability of RDF to heterogeneous resource-constrained devices and compare our system to the existing embedded tuple stores Antelope and TeenyLIME.
[ { "created": "Fri, 28 Feb 2014 12:52:47 GMT", "version": "v1" } ]
2014-03-03
[ [ "Hasemann", "Henning", "" ], [ "Kröller", "Alexander", "" ], [ "Pagel", "Max", "" ] ]
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