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1401.0987
Chi Jin
Chi Jin, Ziteng Wang, Junliang Huang, Yiqiao Zhong, Liwei Wang
Differentially Private Data Releasing for Smooth Queries with Synthetic Database Output
null
null
null
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cs.DB stat.ML
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider accurately answering smooth queries while preserving differential privacy. A query is said to be $K$-smooth if it is specified by a function defined on $[-1,1]^d$ whose partial derivatives up to order $K$ are all bounded. We develop an $\epsilon$-differentially private mechanism for the class of $K$-smooth queries. The major advantage of the algorithm is that it outputs a synthetic database. In real applications, a synthetic database output is appealing. Our mechanism achieves an accuracy of $O (n^{-\frac{K}{2d+K}}/\epsilon )$, and runs in polynomial time. We also generalize the mechanism to preserve $(\epsilon, \delta)$-differential privacy with slightly improved accuracy. Extensive experiments on benchmark datasets demonstrate that the mechanisms have good accuracy and are efficient.
[ { "created": "Mon, 6 Jan 2014 05:12:01 GMT", "version": "v1" } ]
2014-01-07
[ [ "Jin", "Chi", "" ], [ "Wang", "Ziteng", "" ], [ "Huang", "Junliang", "" ], [ "Zhong", "Yiqiao", "" ], [ "Wang", "Liwei", "" ] ]
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1401.0989
Yasuyuki Matsuo
Yasuyuki Matsuo (Mie University, Japan)
Role of parity transformation for the fluctuation theorem: Limit cycle and symmetry breaking
15 pages, 2 figures. Published version
Physical Review E 89, 022124 (2014)
10.1103/PhysRevE.89.022124
null
cond-mat.stat-mech nlin.CD physics.class-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The fluctuation theorem of the Crooks type is studied for thermodynamic nonlinear- multivariate systems. In particular, a bivariate system having a limit cycle is discussed in detail. It is explicitly shown how the time reversal operation has to be combined with the parity transformation in order to derive the fluctuation theorem for the change of the renormalized entropy. Furthermore, breakdown of the symmetry in a limit-cycle model due to the effect of fluctuations is also discussed.
[ { "created": "Mon, 6 Jan 2014 05:34:22 GMT", "version": "v1" }, { "created": "Tue, 7 Jan 2014 06:47:19 GMT", "version": "v2" }, { "created": "Fri, 24 Jan 2014 02:13:25 GMT", "version": "v3" }, { "created": "Wed, 26 Feb 2014 06:17:27 GMT", "version": "v4" } ]
2014-02-27
[ [ "Matsuo", "Yasuyuki", "", "Mie University, Japan" ] ]
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1401.0991
Arup Nandy Kumar
Arup Kumar Nandy and C. S. Jog
Conservation properties of the trapezoidal rule in linear time domain analysis of acoustics and structures
null
null
null
null
physics.comp-ph math.NA
http://creativecommons.org/licenses/by-nc-sa/3.0/
The trapezoidal rule, which is a special case of the Newmark family of algorithms, is one of the most widely used methods for transient hyperbolic problems. In this work, we show that this rule conserves linear and angular momenta and energy in the case of undamped linear elastodynamics problems, and an `energy-like measure' in the case of undamped acoustic problems. These conservation properties, thus, provide a rational basis for using this algorithm. In linear elastodynamics problems, variants of the trapezoidal rule that incorporate `high-frequency' dissipation are often used, since the higher frequencies, which are not approximated properly by the standard displacement-based approach, often result in unphysical behavior. Instead of modifying the trapezoidal algorithm, we propose using a hybrid finite element framework for constructing the stiffness matrix. Hybrid finite elements, which are based on a two-field variational formulation involving displacement and stresses, are known to approximate the eigenvalues much more accurately than the standard displacement-based approach, thereby either bypassing or reducing the need for high-frequency dissipation. We show this by means of several examples, where we compare the numerical solutions obtained using the displacement-based and hybrid approaches against analytical solutions.
[ { "created": "Mon, 6 Jan 2014 05:49:42 GMT", "version": "v1" } ]
2014-01-07
[ [ "Nandy", "Arup Kumar", "" ], [ "Jog", "C. S.", "" ] ]
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1401.0994
Xiangyun Zhou
Chunxiao Cai, Yueming Cai, Xiangyun Zhou, Weiwei Yang, and Wendong Yang
When Does Relay Transmission Give a More Secure Connection in Wireless Ad Hoc Networks?
Accepted for publication in IEEE Transactions On Information Forensics and Security
null
10.1109/TIFS.2013.2297835
null
cs.IT cs.CR math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Relay transmission can enhance coverage and throughput, while it can be vulnerable to eavesdropping attacks due to the additional transmission of the source message at the relay. Thus, whether or not one should use relay transmission for secure communication is an interesting and important problem. In this paper, we consider the transmission of a confidential message from a source to a destination in a decentralized wireless network in the presence of randomly distributed eavesdroppers. The source-destination pair can be potentially assisted by randomly distributed relays. For an arbitrary relay, we derive exact expressions of secure connection probability for both colluding and non-colluding eavesdroppers. We further obtain lower bound expressions on the secure connection probability, which are accurate when the eavesdropper density is small. By utilizing these lower bound expressions, we propose a relay selection strategy to improve the secure connection probability. By analytically comparing the secure connection probability for direct transmission and relay transmission, we address the important problem of whether or not to relay and discuss the condition for relay transmission in terms of the relay density and source-destination distance. These analytical results are accurate in the small eavesdropper density regime.
[ { "created": "Mon, 6 Jan 2014 06:42:01 GMT", "version": "v1" } ]
2016-11-17
[ [ "Cai", "Chunxiao", "" ], [ "Cai", "Yueming", "" ], [ "Zhou", "Xiangyun", "" ], [ "Yang", "Weiwei", "" ], [ "Yang", "Wendong", "" ] ]
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1401.0997
Malisa Vucinic
Malisa Vucinic (LIG Laboratoire d'Informatique de Grenoble), Bernard Tourancheau (LIG Laboratoire d'Informatique de Grenoble), Andrzej Duda (LIG Laboratoire d'Informatique de Grenoble)
Performance Comparison of the RPL and LOADng Routing Protocols in a Home Automation Scenario
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Wireless Communications and Networking Conference (WCNC), 2013 IEEE (2013)
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null
cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
RPL, the routing protocol proposed by IETF for IPv6/6LoWPAN Low Power and Lossy Networks has significant complexity. Another protocol called LOADng, a lightweight variant of AODV, emerges as an alternative solution. In this paper, we compare the performance of the two protocols in a Home Automation scenario with heterogenous traffic patterns including a mix of multipoint-to-point and point-to-multipoint routes in realistic dense non-uniform network topologies. We use Contiki OS and Cooja simulator to evaluate the behavior of the ContikiRPL implementation and a basic non-optimized implementation of LOADng. Unlike previous studies, our results show that RPL provides shorter delays, less control overhead, and requires less memory than LOADng. Nevertheless, enhancing LOADng with more efficient flooding and a better route storage algorithm may improve its performance.
[ { "created": "Mon, 6 Jan 2014 07:09:53 GMT", "version": "v1" } ]
2014-01-07
[ [ "Vucinic", "Malisa", "", "LIG Laboratoire d'Informatique de Grenoble" ], [ "Tourancheau", "Bernard", "", "LIG Laboratoire d'Informatique de Grenoble" ], [ "Duda", "Andrzej", "", "LIG\n Laboratoire d'Informatique de Grenoble" ] ]
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1401.0998
Olivier Hermant
Lisa Allali (LIX), Olivier Hermant (CRI, INRIA Paris-Rocquencourt)
Semantic A-translation and Super-consistency entail Classical Cut Elimination
null
LPAR 19 - 19th Conference on Logic for Programming, Artificial Intelligence, and Reasoning - 2013 8312 (2013) 407-422
null
null
cs.LO math.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We show that if a theory R defined by a rewrite system is super-consistent, the classical sequent calculus modulo R enjoys the cut elimination property, which was an open question. For such theories it was already known that proofs strongly normalize in natural deduction modulo R, and that cut elimination holds in the intuitionistic sequent calculus modulo R. We first define a syntactic and a semantic version of Friedman's A-translation, showing that it preserves the structure of pseudo-Heyting algebra, our semantic framework. Then we relate the interpretation of a theory in the A-translated algebra and its A-translation in the original algebra. This allows to show the stability of the super-consistency criterion and the cut elimination theorem.
[ { "created": "Mon, 6 Jan 2014 07:10:21 GMT", "version": "v1" } ]
2014-01-07
[ [ "Allali", "Lisa", "", "LIX" ], [ "Hermant", "Olivier", "", "CRI, INRIA Paris-Rocquencourt" ] ]
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1401.1003
Nanditha Rao Ms
Nanditha P. Rao, Shahbaz Sarik and Madhav P. Desai
On the likelihood of multiple bit upsets in logic circuits
6 pages
null
null
null
cs.AR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Soft errors have a significant impact on the circuit reliability at nanoscale technologies. At the architectural level, soft errors are commonly modeled by a probabilistic bit-flip model. In developing such abstract fault models, an important issue to consider is the likelihood of multiple bit errors caused by particle strikes. This likelihood has been studied to a great extent in memories, but has not been understood to the same extent in logic circuits. In this paper, we attempt to quantify the likelihood that a single transient event can cause multiple bit errors in logic circuits consisting of combinational gates and flip-flops. In particular, we calculate the conditional probability of multiple bit-flips given that a single bit flips as a result of the transient. To calculate this conditional probability, we use a Monte Carlo technique in which samples are generated using detailed post-layout circuit simulations. Our experiments on the ISCAS'85 benchmarks and a few other circuits indicate that, this conditional probability is quite significant and can be as high as 0.31. Thus we conclude that multiple bit-flips must necessarily be considered in order to obtain a realistic architectural fault model for soft errors.
[ { "created": "Mon, 6 Jan 2014 07:36:13 GMT", "version": "v1" } ]
2014-01-07
[ [ "Rao", "Nanditha P.", "" ], [ "Sarik", "Shahbaz", "" ], [ "Desai", "Madhav P.", "" ] ]
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1401.1004
Takashi Sako
Y.Itow, H.Menjo, G.Mitsuka, T.Sako, K.Kasahara, T.Suzuki, S.Torii, O.Adriani, A.Tricomi, Y.Goto and K.Tanida
Letter of intent; Precise measurements of very forward particle production at RHIC
37 pages, 22 figures, Letter of Intent submitted to the RHIC PAC in June 2013
null
null
null
physics.ins-det hep-ex nucl-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we propose an experiment for the precise measurements of very forward particle production at RHIC. The proposal is to install a LHCf-like calorimeter in the ZDC installation slot at one of the RHIC interaction points. By installing a high-resolution electromagnetic calorimeter at this location we measure the spectra of photons, neutrons and pi0 at pseudo rapidity eta above 6. The new measurements at 500 GeV p-p collisions contribute to improve the hadronic interaction models used in the cosmic-ray air shower simulations. Using a similar kinematic coverage at RHIC to that of the measurements at LHC, we can test the Feynman scaling with a wide energy range and make the extrapolation of models into cosmic-ray energy more reliable. Combination of a high position resolution of the LHCf detector and a high energy resolution of the ZDC makes it possible to determine pT of forward neutrons with the ever best resolution. This enables us to study the forward neutron spin asymmetry discovered at RHIC in more detail. Another new experiment expected at RHIC is world-first light-ion collisions. Cosmic-ray interaction models have been so far tested with accelerator data, but colliders have provided only p-p and heavy-ion collisions. To simulate the interaction between cosmic-ray particles and atmosphere, collision of light ions like nitrogen is a ultimate goal for the cosmic-ray physics. We propose 200 GeV p-N collisions together with 200 GeV p-p collisions to study the nuclear effects in the forward particle production. The experiment can be performed by using the existing LHCf detector. Considering the geometry and response of one of the LHCf detectors, we propose some short dedicated operations. Ideal beam conditions are summarized in this paper. Our basic idea is to bring one of the LHCf detectors to RHIC and then operate from 2016 season at RHIC.
[ { "created": "Mon, 6 Jan 2014 07:38:34 GMT", "version": "v1" } ]
2014-01-07
[ [ "Itow", "Y.", "" ], [ "Menjo", "H.", "" ], [ "Mitsuka", "G.", "" ], [ "Sako", "T.", "" ], [ "Kasahara", "K.", "" ], [ "Suzuki", "T.", "" ], [ "Torii", "S.", "" ], [ "Adriani", "O.", "" ], [ "Tricomi", "A.", "" ], [ "Goto", "Y.", "" ], [ "Tanida", "K.", "" ] ]
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1401.1008
Daisuke Akamatsu
Daisuke Akamatsu, Hajime Inaba, Kazumoto Hosaka, Masami Yasuda, Atsushi Onae, Tomonari Suzuyama, Masaki Amemiya, and Feng-Lei Hong
Spectroscopy and frequency measurement of the $^{87}$Sr clock transition by laser linewidth transfer using an optical frequency comb
5 pages, 4 figures
Applied Physics Express 7, 012401 (2014)
10.7567/APEX.7.012401
null
physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We perform spectroscopic observations of the 698-nm clock transition in $^{87}$Sr confined in an optical lattice using a laser linewidth transfer technique. A narrow-linewidth laser interrogating the clock transition is prepared by transferring the linewidth of a master laser (1064 nm) to that of a slave laser (698 nm) with a high-speed controllable fiber-based frequency comb. The Fourier-limited spectrum is observed for an 80-ms interrogating pulse. We determine that the absolute frequency of the 5s$^{2}$ $^{1}$S$_{0}$ - 5s5p $^{3}$P$_{0}$ clock transition in $^{87}$Sr is 429 228 004 229 872.0 (1.6) Hz referenced to the SI second.
[ { "created": "Mon, 6 Jan 2014 07:48:09 GMT", "version": "v1" } ]
2015-06-18
[ [ "Akamatsu", "Daisuke", "" ], [ "Inaba", "Hajime", "" ], [ "Hosaka", "Kazumoto", "" ], [ "Yasuda", "Masami", "" ], [ "Onae", "Atsushi", "" ], [ "Suzuyama", "Tomonari", "" ], [ "Amemiya", "Masaki", "" ], [ "Hong", "Feng-Lei", "" ] ]
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1401.1009
Frederic Mayet
F. Mayet (1), J. Billard (2), G. Bosson (1), O. Bourrion (1), O. Guillaudin (1), J. Lamblin (1), J. P. Richer (1), Q. Riffard (1), D. Santos (1), F. J. Iguaz (3), L. Lebreton (4), D. Maire (4) ((1) LPSC Grenoble, (2) MIT, (3) Univ. Zaragoza, (4) IRSN Cadarache)
Measurement of the electron drift velocity for directional dark matter detectors
Proceedings of the 4th international conference on Directional Detection of Dark Matter (CYGNUS 2013), 10-12 June 2013, Toyama, Japan
J. Phys. Conf. Ser. 469 (2013) 012006
10.1088/1742-6596/469/1/012006
in2p3-00845411
astro-ph.IM physics.ins-det
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Three-dimensional track reconstruction is a key issue for directional Dark Matter detection. It requires a precise knowledge of the electron drift velocity. Magboltz simulations are known to give a good evaluation of this parameter. However, large TPC operated underground on long time scale may be characterized by an effective electron drift velocity that may differ from the value evaluated by simulation. In situ measurement of this key parameter is hence a way to avoid bias in the 3D track reconstruction. We present a dedicated method for the measurement of the electron drift velocity with the MIMAC detector. It is tested on two gas mixtures : $\rm CF_4$ and $\rm CF_4+CHF_3$. We also show that adding $\rm CHF_3$ allows us to lower the electron drift velocity while keeping almost the same Fluorine content of the gas mixture.
[ { "created": "Mon, 6 Jan 2014 07:53:06 GMT", "version": "v1" } ]
2014-01-07
[ [ "Mayet", "F.", "" ], [ "Billard", "J.", "" ], [ "Bosson", "G.", "" ], [ "Bourrion", "O.", "" ], [ "Guillaudin", "O.", "" ], [ "Lamblin", "J.", "" ], [ "Richer", "J. P.", "" ], [ "Riffard", "Q.", "" ], [ "Santos", "D.", "" ], [ "Iguaz", "F. J.", "" ], [ "Lebreton", "L.", "" ], [ "Maire", "D.", "" ] ]
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1401.1011
Guangxu Zhu
Guangxu Zhu, Caijun Zhong, Himal A. Suraweera, Zhaoyang Zhang and Chau Yuen
Outage Probability of Dual-Hop Multiple Antenna AF Systems with Linear Processing in the Presence of Co-Channel Interference
14 pages TWC
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper considers a dual-hop amplify-and-forward (AF) relaying system where the relay is equipped with multiple antennas, while the source and the destination are equipped with a single antenna. Assuming that the relay is subjected to co-channel interference (CCI) and additive white Gaussian noise (AWGN) while the destination is corrupted by AWGN only, we propose three heuristic relay precoding schemes to combat the CCI, namely, 1) Maximum ratio combining/maximal ratio transmission (MRC/MRT), 2) Zero-forcing/MRT (ZF/MRT), 3) Minimum mean-square error/MRT (MMSE/MRT). We derive new exact outage expressions as well as simple high signal-to-noise ratio (SNR) outage approximations for all three schemes. Our findings suggest that both the MRC/MRT and the MMSE/MRT schemes achieve a full diversity of N, while the ZF/MRT scheme achieves a diversity order of N-M, where N is the number of relay antennas and M is the number of interferers. In addition, we show that the MMSE/MRT scheme always achieves the best outage performance, and the ZF/MRT scheme outperforms the MRC/MRT scheme in the low SNR regime, while becomes inferior to the MRC/MRT scheme in the high SNR regime. Finally, in the large N regime, we show that both the ZF/MRT and MMSE/MRT schemes are capable of completely eliminating the CCI, while perfect interference cancelation is not possible with the MRC/MRT scheme.
[ { "created": "Mon, 6 Jan 2014 08:26:40 GMT", "version": "v1" } ]
2014-01-07
[ [ "Zhu", "Guangxu", "" ], [ "Zhong", "Caijun", "" ], [ "Suraweera", "Himal A.", "" ], [ "Zhang", "Zhaoyang", "" ], [ "Yuen", "Chau", "" ] ]
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1401.1016
Pinar Sen
Pinar Sen and Ali Ozgur Yilmaz
Factor Graph Based LMMSE Filtering for Colored Gaussian Processes
5 pages, 4 figures
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose a low complexity, graph based linear minimum mean square error (LMMSE) filter in which the non-white characteristics of a random process are taken into account. Our method corresponds to block LMMSE filtering, and has the advantage of complexity linearly increasing with the block length and the ease of incorporating the a priori information of the input signals whenever possible. The proposed method can be used with any random process with a known autocorrelation function with the help of an approximation to an autoregressive (AR) process. We show through extensive simulations that our method performs very close to the optimal block LMMSE filtering for Gaussian input signals.
[ { "created": "Mon, 6 Jan 2014 09:01:15 GMT", "version": "v1" }, { "created": "Tue, 13 May 2014 08:22:01 GMT", "version": "v2" } ]
2014-05-14
[ [ "Sen", "Pinar", "" ], [ "Yilmaz", "Ali Ozgur", "" ] ]
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1401.1018
Roumen Tsekov
R. Tsekov
A novel protocol for linearization of the Poisson-Boltzmann equation
null
Ann. Univ. Sofia, Fac. Chem. Pharm. 106 (2014) 59-64
null
null
physics.chem-ph cond-mat.soft
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A new protocol for linearization of the Poisson-Boltzmann equation is proposed and the resultant electrostatic equation coincides formally with the Debye-Huckel equation, the solution of which is well known for many electrostatic problems. The protocol is examined on the example of electrostatically stabilized nano-bubbles and it is shown that stable nano-bubbles could be present in aqueous solutions of anionic surfactants near the critical temperature, if the surface potential is constant. At constant surface charge non nano-bubble could exist.
[ { "created": "Mon, 6 Jan 2014 09:27:22 GMT", "version": "v1" }, { "created": "Sun, 30 Mar 2014 05:57:03 GMT", "version": "v2" }, { "created": "Sat, 25 Oct 2014 04:38:54 GMT", "version": "v3" } ]
2014-10-28
[ [ "Tsekov", "R.", "" ] ]
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1401.1024
Marius Lindauer
Holger Hoos and Roland Kaminski and Marius Lindauer and Torsten Schaub
Solver Scheduling via Answer Set Programming
To appear in Theory and Practice of Logic Programming (TPLP)
null
null
null
cs.AI cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Although Boolean Constraint Technology has made tremendous progress over the last decade, the efficacy of state-of-the-art solvers is known to vary considerably across different types of problem instances and is known to depend strongly on algorithm parameters. This problem was addressed by means of a simple, yet effective approach using handmade, uniform and unordered schedules of multiple solvers in ppfolio, which showed very impressive performance in the 2011 SAT Competition. Inspired by this, we take advantage of the modeling and solving capacities of Answer Set Programming (ASP) to automatically determine more refined, that is, non-uniform and ordered solver schedules from existing benchmarking data. We begin by formulating the determination of such schedules as multi-criteria optimization problems and provide corresponding ASP encodings. The resulting encodings are easily customizable for different settings and the computation of optimum schedules can mostly be done in the blink of an eye, even when dealing with large runtime data sets stemming from many solvers on hundreds to thousands of instances. Also, the fact that our approach can be customized easily enabled us to swiftly adapt it to generate parallel schedules for multi-processor machines.
[ { "created": "Mon, 6 Jan 2014 09:58:02 GMT", "version": "v1" } ]
2014-01-07
[ [ "Hoos", "Holger", "" ], [ "Kaminski", "Roland", "" ], [ "Lindauer", "Marius", "" ], [ "Schaub", "Torsten", "" ] ]
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1401.1030
Clotilde Lethiec
Clotilde Lethiec, Ferruccio Pisanello, Luigi Carbone, Alberto Bramati, Laurent Coolen and Agn\`es Ma\^itre
Polarimetry-based analysis of dipolar transitions of single colloidal CdSe/CdS dot-in-rods
null
2014 New J. Phys. 16 093014
10.1088/1367-2630/16/9/093014
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We prove experimentally, upon polarization analysis performed on a large statistic of single nanoemitters, that high quality core/shell CdSe/CdS dot-in-rods behave as linear dipoles. Moreover, the dipole in-plane and out-of-plane orientations could be assessed. We demonstrate in particular that, contrary to expectations, the emitting dipole is not aligned with the elongated axis of the dot-in-rod. Besides, the polarimetric measurements prove that the excitation transition cannot be approximated by a single linear dipole, contrary to the emission transition. Finally, we highlight that non-radiative channels of charge carrier recombination do not affect the dipolar nature of the radiative transitions.
[ { "created": "Mon, 6 Jan 2014 10:14:29 GMT", "version": "v1" } ]
2015-04-20
[ [ "Lethiec", "Clotilde", "" ], [ "Pisanello", "Ferruccio", "" ], [ "Carbone", "Luigi", "" ], [ "Bramati", "Alberto", "" ], [ "Coolen", "Laurent", "" ], [ "Maître", "Agnès", "" ] ]
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1401.1031
Noreen Jamil
Noreen Jamil
Constraint Solvers for User Interface Layout
null
null
null
null
cs.HC cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Constraints have played an important role in the construction of GUIs, where they are mainly used to define the layout of the widgets. Resizing behavior is very important in GUIs because areas have domain specific parameters such as form the resizing of windows. If linear objective function is used and window is resized then error is not distributed equally. To distribute the error equally, a quadratic objective function is introduced. Different algorithms are widely used for solving linear constraints and quadratic problems in a variety of different scientific areas. The linear relxation, Kaczmarz, direct and linear programming methods are common methods for solving linear constraints for GUI layout. The interior point and active set methods are most commonly used techniques to solve quadratic programming problems. Current constraint solvers designed for GUI layout do not use interior point methods for solving a quadratic objective function subject to linear equality and inequality constraints. In this paper, performance aspects and the convergence speed of interior point and active set methods are compared along with one most commonly used linear programming method when they are implemented for graphical user interface layout. The performance and convergence of the proposed algorithms are evaluated empirically using randomly generated UI layout specifications of various sizes. The results show that the interior point algorithms perform significantly better than the Simplex method and QOCA-solver, which uses the active set method implementation for solving quadratic optimization.
[ { "created": "Mon, 6 Jan 2014 10:29:07 GMT", "version": "v1" } ]
2014-01-07
[ [ "Jamil", "Noreen", "" ] ]
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1401.1032
Mehdi Moussaid
Mehdi Moussaid
Opinion Formation and the Collective Dynamics of Risk Perception
null
PLoS ONE 8(12): e84592
10.1371/journal.pone.0084592
null
physics.soc-ph cs.SI nlin.AO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The formation of collective opinion is a complex phenomenon that results from the combined effects of mass media exposure and social influence between individuals. The present work introduces a model of opinion formation specifically designed to address risk judgments, such as attitudes towards climate change, terrorist threats, or children vaccination. The model assumes that people collect risk information from the media environment and exchange them locally with other individuals. Even though individuals are initially exposed to the same sample of information, the model predicts the emergence of opinion polarization and clustering. In particular, numerical simulations highlight two crucial factors that determine the collective outcome: the propensity of individuals to search for independent information, and the strength of social influence. This work provides a quantitative framework to anticipate and manage how the public responds to a given risk, and could help understanding the systemic amplification of fears and worries, or the underestimation of real dangers.
[ { "created": "Mon, 6 Jan 2014 10:29:51 GMT", "version": "v1" } ]
2014-01-07
[ [ "Moussaid", "Mehdi", "" ] ]
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1401.1042
Yedidia Haim
Y. Haim, Y. Marciano and G. deBotton
An experimental apparatus for study of direct {\beta}-radiation conversion for energy harvesting
4 pages, 5 figures
Proc. PowerMEMS 2012, pp. 428-431
null
null
physics.ins-det
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper introduces the development and testing of an experimental apparatus for characterization of a direct charging nuclear battery. The battery consists of a parallel-plates capacitor which is charged in a vacuum by the current of {\beta}-radiation particles (electrons) emitted from a radioisotope. A 63Ni radioisotope with an activity of 15mCi that produces a 20pA current was selected as the radiation source. The apparatus is unique in its design, having ultra-low leakage current and a few options for charge measurements. Preliminary results of a few tests are presented to demonstrate the capabilities of the apparatus.
[ { "created": "Mon, 6 Jan 2014 11:12:57 GMT", "version": "v1" } ]
2014-01-07
[ [ "Haim", "Y.", "" ], [ "Marciano", "Y.", "" ], [ "deBotton", "G.", "" ] ]
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1401.1043
Ibrahim A
A. Ibrahim, Shivakumar Sastry and P.S. Sastry
Discovering Compressing Serial Episodes from Event Sequences
27 pages 3 figure
null
null
null
cs.DB
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Most pattern mining methods output a very large number of frequent patterns and isolating a small but relevant subset is a challenging problem of current interest in frequent pattern mining. In this paper we consider discovery of a small set of relevant frequent episodes from data sequences. We make use of the Minimum Description Length principle to formulate the problem of selecting a subset of episodes. Using an interesting class of serial episodes with inter-event constraints and a novel encoding scheme for data using such episodes, we present algorithms for discovering small set of episodes that achieve good data compression. Using an example of the data streams obtained from distributed sensors in a composable coupled conveyor system, we show that our method is very effective in unearthing highly relevant episodes and that our scheme also achieves good data compression.
[ { "created": "Mon, 6 Jan 2014 11:16:01 GMT", "version": "v1" }, { "created": "Sat, 11 Oct 2014 10:47:52 GMT", "version": "v2" } ]
2014-10-14
[ [ "Ibrahim", "A.", "" ], [ "Sastry", "Shivakumar", "" ], [ "Sastry", "P. S.", "" ] ]
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1401.1053
Benedikt Ahrens
Benedikt Ahrens and R\'egis Spadotti
Terminal semantics for codata types in intensional Martin-L\"of type theory
14 pages, ancillary files contain formalized proof in the proof assistant Coq; v2: 20 pages, title and abstract changed, give a terminal semantics for streams as well as for matrices, Coq proof files updated accordingly
null
null
null
cs.LO math.CT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this work, we study the notions of relative comonad and comodule over a relative comonad, and use these notions to give a terminal coalgebra semantics for the coinductive type families of streams and of infinite triangular matrices, respectively, in intensional Martin-L\"of type theory. Our results are mechanized in the proof assistant Coq.
[ { "created": "Mon, 6 Jan 2014 11:58:48 GMT", "version": "v1" }, { "created": "Tue, 22 Apr 2014 14:34:34 GMT", "version": "v2" } ]
2014-04-23
[ [ "Ahrens", "Benedikt", "" ], [ "Spadotti", "Régis", "" ] ]
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Terminal semantics for codata types in intensional Martin-Löf type theory
https://arxiv.org/abs/1401.1053v2
https://arxiv.org/pdf/1401.1053v2.pdf
https://github.com/benediktahrens/coinductives
false
false
https://paperswithcode.com/paper/terminal-semantics-for-codata-types-in
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1401.1059
Pulkit Grover
Pulkit Grover
"Information-Friction" and its implications on minimum energy required for communication
Accepted in IEEE Trans. Information Theory; preliminary version presented at ISIT '13
null
10.1109/TIT.2014.2365777
null
cs.IT cs.CC math-ph math.IT math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Just as there are frictional losses associated with moving masses on a surface, what if there were frictional losses associated with moving information on a substrate? Indeed, many modes of communication suffer from such frictional losses. We propose to model these losses as proportional to "bit-meters," i.e., the product of mass of information (i.e., the number of bits) and the distance of information transport. We use this "information- friction" model to understand fundamental energy requirements on encoding and decoding in communication circuitry. First, for communication across a binary input AWGN channel, we arrive at fundamental limits on bit-meters (and thus energy consumption) for decoding implementations that have a predetermined input-independent length of messages. For encoding, we relax the fixed-length assumption and derive bounds for flexible-message- length implementations. Using these lower bounds we show that the total (transmit + encoding + decoding) energy-per-bit must diverge to infinity as the target error probability is lowered to zero. Further, the closer the communication rate is maintained to the channel capacity (as the target error-probability is lowered to zero), the faster the required decoding energy diverges to infinity.
[ { "created": "Mon, 6 Jan 2014 12:34:35 GMT", "version": "v1" }, { "created": "Mon, 1 Sep 2014 11:52:42 GMT", "version": "v2" } ]
2016-11-15
[ [ "Grover", "Pulkit", "" ] ]
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1401.1061
Yingqian Zhang
Sicco Verwer, Yingqian Zhang, Qing Chuan Ye
Learning optimization models in the presence of unknown relations
37 pages. Working paper
null
10.1016/j.artint.2015.05.004
null
cs.AI cs.GT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In a sequential auction with multiple bidding agents, it is highly challenging to determine the ordering of the items to sell in order to maximize the revenue due to the fact that the autonomy and private information of the agents heavily influence the outcome of the auction. The main contribution of this paper is two-fold. First, we demonstrate how to apply machine learning techniques to solve the optimal ordering problem in sequential auctions. We learn regression models from historical auctions, which are subsequently used to predict the expected value of orderings for new auctions. Given the learned models, we propose two types of optimization methods: a black-box best-first search approach, and a novel white-box approach that maps learned models to integer linear programs (ILP) which can then be solved by any ILP-solver. Although the studied auction design problem is hard, our proposed optimization methods obtain good orderings with high revenues. Our second main contribution is the insight that the internal structure of regression models can be efficiently evaluated inside an ILP solver for optimization purposes. To this end, we provide efficient encodings of regression trees and linear regression models as ILP constraints. This new way of using learned models for optimization is promising. As the experimental results show, it significantly outperforms the black-box best-first search in nearly all settings.
[ { "created": "Mon, 6 Jan 2014 12:42:47 GMT", "version": "v1" }, { "created": "Tue, 15 Apr 2014 11:22:03 GMT", "version": "v2" } ]
2018-10-16
[ [ "Verwer", "Sicco", "" ], [ "Zhang", "Yingqian", "" ], [ "Ye", "Qing Chuan", "" ] ]
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1401.1065
Meghdad Ghari
Meghdad Ghari
Labeled Sequent Calculus and Countermodel Construction for Justification Logics
71 pages
null
null
null
math.LO cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Justification logics are modal-like logics that provide a framework for reasoning about justifications. This paper introduces labeled sequent calculi for justification logics, as well as for hybrid modal-justification logics. Using the method due to Sara Negri, we internalize the Kripke-style semantics of justification logics, known as Fitting models, within the syntax of the sequent calculus to produce labeled sequent calculus. We show that our labeled sequent calculi enjoy a weak subformula property, all of the rules are invertible and the structural rules (weakening and contraction) and cut are admissible. Finally soundness and completeness are established, and termination of proof search for some of the labeled systems are shown. We describe a procedure, for some of the labeled systems, which produces a derivation for valid sequents and a countermodel for non-valid sequents. We also show a model correspondence for justification logics in the context of labeled sequent calculus.
[ { "created": "Mon, 6 Jan 2014 13:13:19 GMT", "version": "v1" }, { "created": "Wed, 5 Nov 2014 09:14:14 GMT", "version": "v2" } ]
2014-11-06
[ [ "Ghari", "Meghdad", "" ] ]
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1401.1068
Martin van Mourik
M.W. van Mourik, W.J. Engelen, E.J.D. Vredenbregt, and O.J. Luiten
Ultrafast electron diffraction using an ultracold source
5 pages, 4 figures
null
null
null
physics.acc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present diffraction patterns from micron-sized areas of mono-crystalline graphite obtained with an ultracold and ultrafast electron source. We show that high spatial coherence is manifest in the visibility of the patterns even for picosecond bunches of appreciable charge, enabled by the extremely low source temperature (~ 10 K). For a larger, ~ 100 um spot size on the sample, spatial coherence lengths > 10 nm result, sufficient to resolve diffraction patterns of complex protein crystals. This makes the source ideal for ultrafast electron diffraction of complex macromolecular structures such as membrane proteins, in a regime unattainable by conventional photocathode sources. By further reducing the source size, sub-um spot sizes on the sample become possible with spatial coherence lengths exceeding 1 nm, enabling ultrafast nano-diffraction for material science.
[ { "created": "Mon, 6 Jan 2014 13:24:13 GMT", "version": "v1" } ]
2014-01-07
[ [ "van Mourik", "M. W.", "" ], [ "Engelen", "W. J.", "" ], [ "Vredenbregt", "E. J. D.", "" ], [ "Luiten", "O. J.", "" ] ]
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1401.1070
Rosine Lallement
R. Lallement, J.L. Bertaux, E. Quemerais, B.R. Sandel
Galactic Cosmic Rays measured by UVS on Voyager 1 and the end of the modulation: Is the upwind heliopause a collapsed charge-exchange layer?
12 ages, 8 figures, accepted for publication in Astronomy & Astrophysics
null
10.1051/0004-6361/201322705
null
astro-ph.GA astro-ph.HE physics.space-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The detectors of the UltraViolet Spectrographs (UVS) on Voyager 1/2 are recording a background that was earlier assigned to disintegrations in the RTG. We show that it arises instead from Galactic Cosmic Rays (GCRs). We show the 1992-2013 GCR flux measured by UVS on V1 and, by comparing with data from the GCR dedicated detectors, we estimate the energy range responsible for this UVS signal, around 300 MeV, and the response of UVS to the GCR anisotropy. After the abrupt jumps of May and August 2012 the count rate has been fluctuating only slightly around a constant value, but comparing with data from the LECP and the CRS instruments shows that those small variations are only responses to a varying anisotropy and not to a flux change. Taking advantage of the similarity in energy range to one of the products of the CRS instrument suite, we use the ratio between the two independent signals as a proxy for the temporal evolution of the GCR spectral slope around the 300 MeV range. We show that this slope has remained unchanged since Aug 2012 and find strong evidence that it will no longer vary, implying the end of the modulation at those energies and that V1 at this date is near or past the heliopause. The origin of this narrow and stagnating inner heliosheath is still unclear, and we discuss the potential effects of low solar wind speed episodes and subsequent self-amplified charge-exchange with interstellar neutrals, as a source of deceleration and collapse. We suggest that the quasi-static region encountered by V1 may be related to such effects, triggered by the strong post solar-maximum variability. This did not happen for V2 due to its trajectory at an angle further from the heliosphere axis and a later termination shock crossing. The existence on the upwind side of a mixing layer formed by charge transfer instead of a pure plasma contact discontinuity could explain various observations.
[ { "created": "Mon, 6 Jan 2014 13:26:28 GMT", "version": "v1" } ]
2015-06-18
[ [ "Lallement", "R.", "" ], [ "Bertaux", "J. L.", "" ], [ "Quemerais", "E.", "" ], [ "Sandel", "B. R.", "" ] ]
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1401.1076
Hasan Fatih Kisoglu hfk
H.F.Kisoglu, A.Caliskan, S.Sultansoy, M.Yilmaz
Design and Optimization of Low Energy Beam Transport for TAC Proton Facility
null
null
null
null
physics.acc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this study, a low energy beam transport (LEBT) channel for the proton linac section of the Turkish Accelerator Center (TAC) has been designed by using TRAVEL code. Commonly used LEBT including two focusing solenoid magnets will transport and match the H- beam from a volume source to RFQ. In the beam dynamics simulations of such a LEBT line, 95% space-charge compensation (SCC) has been considered in this study. We aimed to find out the determination of our RFQ input parameters that gives the best possible beam quality at the entrance of the RFQ using beam collimator in the LEBT line as an alternative way. In this way, we have acquired the best possible beam quality on RFQ input plane as well as optimizing the LEBT line.
[ { "created": "Mon, 6 Jan 2014 13:43:42 GMT", "version": "v1" }, { "created": "Wed, 28 May 2014 07:53:57 GMT", "version": "v2" } ]
2014-05-29
[ [ "Kisoglu", "H. F.", "" ], [ "Caliskan", "A.", "" ], [ "Sultansoy", "S.", "" ], [ "Yilmaz", "M.", "" ] ]
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1401.1085
Quirijn Bouts
Sander P. A. Alewijnse, Quirijn W. Bouts, Alex P. ten Brink, Kevin Buchin
Distribution-Sensitive Construction of the Greedy Spanner
16 pages,22 figures. Full version of the ESA 2014 publication with the same title
null
null
null
cs.CG cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The greedy spanner is the highest quality geometric spanner (in e.g. edge count and weight, both in theory and practice) known to be computable in polynomial time. Unfortunately, all known algorithms for computing it take Omega(n^2) time, limiting its applicability on large data sets. We observe that for many point sets, the greedy spanner has many `short' edges that can be determined locally and usually quickly, and few or no `long' edges that can usually be determined quickly using local information and the well-separated pair decomposition. We give experimental results showing large to massive performance increases over the state-of-the-art on nearly all tests and real-life data sets. On the theoretical side we prove a near-linear expected time bound on uniform point sets and a near-quadratic worst-case bound. Our bound for point sets drawn uniformly and independently at random in a square follows from a local characterization of t-spanners we give on such point sets: we give a geometric property that holds with high probability on such point sets. This property implies that if an edge set on these points has t-paths between pairs of points `close' to each other, then it has t-paths between all pairs of points. This characterization gives a O(n log^2 n log^2 log n) expected time bound on our greedy spanner algorithm, making it the first subquadratic time algorithm for this problem on any interesting class of points. We also use this characterization to give a O((n + |E|) log^2 n log log n) expected time algorithm on uniformly distributed points that determines if E is a t-spanner, making it the first subquadratic time algorithm for this problem that does not make assumptions on E.
[ { "created": "Mon, 6 Jan 2014 14:04:05 GMT", "version": "v1" }, { "created": "Mon, 30 Jun 2014 13:36:29 GMT", "version": "v2" } ]
2014-07-01
[ [ "Alewijnse", "Sander P. A.", "" ], [ "Bouts", "Quirijn W.", "" ], [ "Brink", "Alex P. ten", "" ], [ "Buchin", "Kevin", "" ] ]
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1401.1086
Paulo Shakarian
Paulo Shakarian, Hansheng Lei, Roy Lindelauf
Power Grid Defense Against Malicious Cascading Failure
null
null
null
null
cs.CR cs.MA physics.soc-ph
http://creativecommons.org/licenses/publicdomain/
An adversary looking to disrupt a power grid may look to target certain substations and sources of power generation to initiate a cascading failure that maximizes the number of customers without electricity. This is particularly an important concern when the enemy has the capability to launch cyber-attacks as practical concerns (i.e. avoiding disruption of service, presence of legacy systems, etc.) may hinder security. Hence, a defender can harden the security posture at certain power stations but may lack the time and resources to do this for the entire power grid. We model a power grid as a graph and introduce the cascading failure game in which both the defender and attacker choose a subset of power stations such as to minimize (maximize) the number of consumers having access to producers of power. We formalize problems for identifying both mixed and deterministic strategies for both players, prove complexity results under a variety of different scenarios, identify tractable cases, and develop algorithms for these problems. We also perform an experimental evaluation of the model and game on a real-world power grid network. Empirically, we noted that the game favors the attacker as he benefits more from increased resources than the defender. Further, the minimax defense produces roughly the same expected payoff as an easy-to-compute deterministic load based (DLB) defense when played against a minimax attack strategy. However, DLB performs more poorly than minimax defense when faced with the attacker's best response to DLB. This is likely due to the presence of low-load yet high-payoff nodes, which we also found in our empirical analysis.
[ { "created": "Mon, 6 Jan 2014 14:08:09 GMT", "version": "v1" } ]
2014-01-07
[ [ "Shakarian", "Paulo", "" ], [ "Lei", "Hansheng", "" ], [ "Lindelauf", "Roy", "" ] ]
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1401.1094
B. P. Datta
B. P. Datta
Study of variations as desired-relative (DELTA), rather than absolute, differences: falsification of the purpose of achieving source-representative and closely comparable lab-results
20 Pages (including facts-illustrative [3] Tables and [2] Figures)
null
null
null
physics.gen-ph physics.data-an
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Recently (arXiv:1101.0973), it has been pointed out by us that the possible variation in any source (S) specific elemental isotopic (viz. 2H/1H) abundance ratio SR can more accurately be assessed by its absolute estimate Sr [viz. as (Sr - DR), with D as a standard-source] than by either corresponding measured-relative (S/W-DELTA) estimate ([Sr/Wr] - 1) or DELTA-scale-converted-relative (S/D-DELTA) estimate ([Sr/DR] - 1). Here, we present the fundamentals behind scale-conversion, thereby enabling to understand why at all Sr should be the source- and/ or variation-characterizing key, i.e. why different lab-specific results should be more closely comparable as absolute estimates (SrLab1, SrLab2) than as desired-relative (S/D-DELTALab1, S/D-DELTALab2) estimates. Further, the study clarifies that: (i) the DELTA-scale-conversion (S/W-DELTA into S/D-DELTA, even with the aid of calibrated auxiliary-reference-standard(s) Ai(s)) cannot make the estimates (as S/D-DELTA, and thus Sr) free of the measurement-reference W; (ii) the employing of (increasing number of) Ai-standards should cause the estimates to be rather (increasingly) inaccurate and, additionally, Ai(s)-specific; and (iii) the S/D-DELTA-estimate may, specifically if S happens to be very close to D in isotopic composition (IC), even misrepresent S; but the corresponding Sr should be very accurate. However, for S and W to be increasingly closer in IC, the S/D-DELTA-estimate and also Sr are shown to be increasingly accurate, irrespective of whether the S/W-DELTA-measurement accuracy could thus be improved or not. Clearly, improvement in measurement-accuracy should ensure additional accuracy in results.
[ { "created": "Fri, 3 Jan 2014 11:13:53 GMT", "version": "v1" } ]
2014-01-07
[ [ "Datta", "B. P.", "" ] ]
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1401.1096
Ali Mostafazadeh
Ali Mostafazadeh
A Differential Integrability Condition for Two-Dimensional Hamiltonian Systems
4 pages
Acta Polytechnica 54, 139-141 (2014)
10.14311/AP.2014.54.0139
null
math-ph math.MP physics.class-ph quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We review, restate, and prove a result due to Kaushal and Korsch [Phys. Lett. A 276, 47 (2000)] on the complete integrability of two-dimensional Hamiltonian systems whose Hamiltonian satisfies a set of four linear second order partial differential equations. In particular, we show that a two-dimensional Hamiltonian system is completely integrable, if the Hamiltonian has the form $H=T+V$ where $V$ and $T$ are respectively harmonic functions of the generalized coordinates and the associated momenta.
[ { "created": "Mon, 6 Jan 2014 14:48:08 GMT", "version": "v1" } ]
2014-05-20
[ [ "Mostafazadeh", "Ali", "" ] ]
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1401.1097
Pascal Marquet
Pascal Marquet
Definition of a moist-air entropy potential temperature. Application to FIRE-I data flights
43 pages / 17 Figures. Published in the Q. J. R. Meteorol. Soc. Volume 137, Issue 656, pages 768-791, April 2011 Part A. V1 to V4: three footnotes (p.9-19-31); arXiv references to next related papers (2012 / 2014); ... ; Paper on (Third-Law) moist-air enthalpy accepted in January 2014; correct typos, boxed equations in sections 4 and 8
null
10.1002/qj.787
null
physics.ao-ph physics.flu-dyn physics.geo-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A moist entropy potential temperature -- denoted by ${\theta}_{s}$ -- is defined analytically in terms of the specific entropy for moist air. The expression for ${\theta}_{s}$ is valid for a general mixing of dry air, water vapour and possible condensed water species. It verifies the same conservative properties as the moist entropy, even for varying dry air or total water content. The moist formulation for ${\theta}_{s}$ is equal to the dry formulation $\theta$ if dry air is considered and it verifies new properties valid for the moist air cases, both saturated or under-saturated ones. Exact and approximate versions of ${\theta}_{s}$ are evaluated for several Stratocumulus cases, in particular by using the aircraft observations FIRE-I experiment data sets. It appears that there is no (or small) jump in ${\theta}_{s}$ at the top of the PBL. The mixing in moist entropy is almost complete in the PBL, with the same values observed in the clear air and the cloudy regions, including the very top of the entrainment region. The Randall-Deardorff CTEI analysis may be interpreted as a mixing in moist entropy criterion. The iso-${\theta}_{s}$ lines are plotted on skew $T$-$\ln(p)$ and conserved variable diagrams. All these properties could suggest some hints on the use of moist entropy (or ${\theta}_{s}$) in cloud modelling or in mixing processes, with the marine Stratocumulus considered as a paradigm of moist turbulence.
[ { "created": "Mon, 6 Jan 2014 14:49:09 GMT", "version": "v1" }, { "created": "Wed, 15 Jan 2014 08:06:20 GMT", "version": "v2" }, { "created": "Mon, 20 Jan 2014 19:29:39 GMT", "version": "v3" }, { "created": "Wed, 26 Feb 2014 09:12:44 GMT", "version": "v4" } ]
2014-02-27
[ [ "Marquet", "Pascal", "" ] ]
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1401.1098
Gintautas P. Kamuntavi\v{c}ius
Gintautas P. Kamuntavi\v{c}ius
Kinematic relativity of quantum Hamiltonian
5 pages
null
null
null
physics.gen-ph quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
It is shown that the well-known relativistic correction of quantum Hamiltonian that is present in textbooks appears after quantization of oversimplified relativistic kinetic energy decomposition. Using the proper expression one obtains the kinetic energy operator which relation with the ususal one is consistent with corresponding relation of kinetic energies in special relativity theory. The Schr\"odinger equation with this operator gives new interesting possibilities for quantum phenomena description.
[ { "created": "Mon, 6 Jan 2014 14:50:50 GMT", "version": "v1" } ]
2014-01-07
[ [ "Kamuntavičius", "Gintautas P.", "" ] ]
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1401.1100
Klaus Jaffe Dr
Klaus Jaffe, Astrid Florez, Cristina M Gomes, Daniel Rodriguez, Carla Achury
On the biological and cultural evolution of shame: Using internet search tools to weight values in many cultures
Submitted for publication
null
null
null
cs.CY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Shame has clear biological roots and its precise form of expression affects social cohesion and cultural characteristics. Here we explore the relative importance between shame and guilt by using Google Translate to produce translation for the words shame, guilt, pain, embarrassment and fear to the 64 languages covered. We also explore the meanings of these concepts among the Yanomami, a horticulturist hunter-gatherer tribe in the Orinoquia. Results show that societies previously described as 'guilt societies' have more words for guilt than for shame, but the large majority, including the societies previously described as 'shame societies', have more words for shame than for guilt. Results are consistent with evolutionary models of shame which predict a wide scatter in the relative importance between guilt and shame, suggesting that cultural evolution of shame has continued the work of biological evolution, and that neither provides a strong adaptive advantage to either shame or guilt. We propose that the study of shame will improve our understanding of the interaction between biological and cultural evolution in the evolution of cognition and emotions.
[ { "created": "Fri, 3 Jan 2014 15:34:28 GMT", "version": "v1" }, { "created": "Mon, 3 Feb 2014 21:57:06 GMT", "version": "v2" } ]
2014-02-05
[ [ "Jaffe", "Klaus", "" ], [ "Florez", "Astrid", "" ], [ "Gomes", "Cristina M", "" ], [ "Rodriguez", "Daniel", "" ], [ "Achury", "Carla", "" ] ]
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1401.1102
Attilio Sacripanti
Attilio Sacripanti
How to enhance effectiveness of Direct Attack Judo throws
37 pages, 1 Diagram, 7 tables, 97 figures, this paper will be published,in Italian language, without mathematical framework into the Italian Judo Federation Magazine: "Athlon" FIJLKAM Yr 2014 Nu. 2
null
null
null
physics.pop-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper is performed an appraisal of the Olympic Sport Judo effectiveness in the optics of Biomechanics. To broaden the classical view,the field of experimentation is obviously the high level competition in which most of rotational application can be found applied more or less instinctively by high level Athletes. Considering the two biomechanical tools that are the physical basis of judo throws it is possible to obtain such results from the analysis of high competition application:Lever Techniques are enhanced in their effectiveness in three ways: The rotational movements, strictly connected to the Lever techniques mechanics achieving victory in competition, can be extended to the unbalance phase. The rotational movements can be applied in a totally new way putting away even the unbalance that is basic in the Lever techniques. The Lever tool can be hybridized with the Couple tool to lower the energy consumption. Couple Techniques are enhanced in their effectiveness also in three ways: The Couple tool that doesnt need unbalance allowing uke body rotate around his center of mass, is enhanced utilizing the Uke body smaller resistance directions,normally summarized in Diagonal attacks. The vertical rotational movements in the transverse plan with the axis in the sagittal plane can be added to the Couple application with transverse rotation and axis in the frontal plane to overcome some defensive resistance, mainly in the trunk and leg group of Couple techniques,like Uchi Mata or O Soto Gari. The rotational movements enhance the throwing action changing the mechanics of Couple into Lever applying a Torque,both with the direction change of one force or the time delay of his application. This analysis, expanded with a short physical framework, clarifies hidden deep concepts and helps teacher and coaches in their professional work.
[ { "created": "Mon, 6 Jan 2014 14:56:57 GMT", "version": "v1" }, { "created": "Tue, 7 Jan 2014 10:12:19 GMT", "version": "v2" } ]
2014-01-08
[ [ "Sacripanti", "Attilio", "" ] ]
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1401.1106
Felix Krahmer
Felix Krahmer and Holger Rauhut
Structured random measurements in signal processing
22 pages, 2 figures
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Compressed sensing and its extensions have recently triggered interest in randomized signal acquisition. A key finding is that random measurements provide sparse signal reconstruction guarantees for efficient and stable algorithms with a minimal number of samples. While this was first shown for (unstructured) Gaussian random measurement matrices, applications require certain structure of the measurements leading to structured random measurement matrices. Near optimal recovery guarantees for such structured measurements have been developed over the past years in a variety of contexts. This article surveys the theory in three scenarios: compressed sensing (sparse recovery), low rank matrix recovery, and phaseless estimation. The random measurement matrices to be considered include random partial Fourier matrices, partial random circulant matrices (subsampled convolutions), matrix completion, and phase estimation from magnitudes of Fourier type measurements. The article concludes with a brief discussion of the mathematical techniques for the analysis of such structured random measurements.
[ { "created": "Mon, 6 Jan 2014 14:59:55 GMT", "version": "v1" }, { "created": "Sun, 6 Jul 2014 13:06:40 GMT", "version": "v2" } ]
2014-07-08
[ [ "Krahmer", "Felix", "" ], [ "Rauhut", "Holger", "" ] ]
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1401.1117
Navin Kashyap
Manuj Mukherjee and Navin Kashyap
On the Communication Complexity of Secret Key Generation in the Multiterminal Source Model
A 5-page version of this manuscript will be submitted to the 2014 IEEE International Symposium on Information Theory (ISIT 2014)
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cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Communication complexity refers to the minimum rate of public communication required for generating a maximal-rate secret key (SK) in the multiterminal source model of Csiszar and Narayan. Tyagi recently characterized this communication complexity for a two-terminal system. We extend the ideas in Tyagi's work to derive a lower bound on communication complexity in the general multiterminal setting. In the important special case of the complete graph pairwise independent network (PIN) model, our bound allows us to determine the exact linear communication complexity, i.e., the communication complexity when the communication and SK are restricted to be linear functions of the randomness available at the terminals.
[ { "created": "Mon, 6 Jan 2014 15:24:36 GMT", "version": "v1" }, { "created": "Sat, 11 Jan 2014 18:16:25 GMT", "version": "v2" } ]
2014-01-14
[ [ "Mukherjee", "Manuj", "" ], [ "Kashyap", "Navin", "" ] ]
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1401.1121
True Merrill
J. True Merrill and S. Charles Doret and Grahame D. Vittorini and J. P. Addision and Kenneth R. Brown
Transformed Composite Sequences for Improved Qubit Addressing
5 pages, 4 figures
Phys. Rev. A 90, 040301 (2014)
10.1103/PhysRevA.90.040301
null
quant-ph physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Selective laser addressing of a single atom or atomic ion qubit can be improved using narrowband composite pulse sequences. We describe a Lie-algebraic technique to generalize known narrowband sequences and introduce new sequences related by dilation and rotation of sequence generators. Our method improves known narrowband sequences by decreasing both the pulse time and the residual error. Finally, we experimentally demonstrate these composite sequences using $^{40}$Ca$^+$ ions trapped in a surface-electrode ion trap.
[ { "created": "Mon, 6 Jan 2014 15:44:42 GMT", "version": "v1" }, { "created": "Wed, 22 Jan 2014 00:32:19 GMT", "version": "v2" } ]
2014-10-08
[ [ "Merrill", "J. True", "" ], [ "Doret", "S. Charles", "" ], [ "Vittorini", "Grahame D.", "" ], [ "Addision", "J. P.", "" ], [ "Brown", "Kenneth R.", "" ] ]
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1401.1123
Nicolas Galichet
Nicolas Galichet (LRI, INRIA Saclay - Ile de France), Mich\`ele Sebag (LRI, INRIA Saclay - Ile de France), Olivier Teytaud (LRI, INRIA Saclay - Ile de France)
Exploration vs Exploitation vs Safety: Risk-averse Multi-Armed Bandits
16 pages
Asian Conference on Machine Learning 2013, Canberra : Australia (2013)
null
null
cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Motivated by applications in energy management, this paper presents the Multi-Armed Risk-Aware Bandit (MARAB) algorithm. With the goal of limiting the exploration of risky arms, MARAB takes as arm quality its conditional value at risk. When the user-supplied risk level goes to 0, the arm quality tends toward the essential infimum of the arm distribution density, and MARAB tends toward the MIN multi-armed bandit algorithm, aimed at the arm with maximal minimal value. As a first contribution, this paper presents a theoretical analysis of the MIN algorithm under mild assumptions, establishing its robustness comparatively to UCB. The analysis is supported by extensive experimental validation of MIN and MARAB compared to UCB and state-of-art risk-aware MAB algorithms on artificial and real-world problems.
[ { "created": "Mon, 6 Jan 2014 15:53:25 GMT", "version": "v1" } ]
2014-01-07
[ [ "Galichet", "Nicolas", "", "LRI, INRIA Saclay - Ile de France" ], [ "Sebag", "Michèle", "", "LRI, INRIA Saclay - Ile de France" ], [ "Teytaud", "Olivier", "", "LRI, INRIA Saclay - Ile\n de France" ] ]
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1401.1124
Yu Chen
Yu Chen, Weicheng Xie, Xiufen Zou
A binary differential evolution algorithm learning from explored solutions
null
null
null
null
cs.NE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Although real-coded differential evolution (DE) algorithms can perform well on continuous optimization problems (CoOPs), it is still a challenging task to design an efficient binary-coded DE algorithm. Inspired by the learning mechanism of particle swarm optimization (PSO) algorithms, we propose a binary learning differential evolution (BLDE) algorithm that can efficiently locate the global optimal solutions by learning from the last population. Then, we theoretically prove the global convergence of BLDE, and compare it with some existing binary-coded evolutionary algorithms (EAs) via numerical experiments. Numerical results show that BLDE is competitive to the compared EAs, and meanwhile, further study is performed via the change curves of a renewal metric and a refinement metric to investigate why BLDE cannot outperform some compared EAs for several selected benchmark problems. Finally, we employ BLDE solving the unit commitment problem (UCP) in power systems to show its applicability in practical problems.
[ { "created": "Mon, 6 Jan 2014 15:54:16 GMT", "version": "v1" }, { "created": "Sat, 10 May 2014 13:01:45 GMT", "version": "v2" } ]
2014-05-13
[ [ "Chen", "Yu", "" ], [ "Xie", "Weicheng", "" ], [ "Zou", "Xiufen", "" ] ]
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1401.1125
Anuj Dawar
Matthew Anderson and Anuj Dawar
On Symmetric Circuits and Fixed-Point Logics
22 pages. Full version of a paper to appear in STACS 2014
null
null
null
cs.CC cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study properties of relational structures such as graphs that are decided by families of Boolean circuits. Circuits that decide such properties are necessarily invariant to permutations of the elements of the input structures. We focus on families of circuits that are symmetric, i.e., circuits whose invariance is witnessed by automorphisms of the circuit induced by the permutation of the input structure. We show that the expressive power of such families is closely tied to definability in logic. In particular, we show that the queries defined on structures by uniform families of symmetric Boolean circuits with majority gates are exactly those definable in fixed-point logic with counting. This shows that inexpressibility results in the latter logic lead to lower bounds against polynomial-size families of symmetric circuits.
[ { "created": "Mon, 6 Jan 2014 15:54:42 GMT", "version": "v1" } ]
2014-01-07
[ [ "Anderson", "Matthew", "" ], [ "Dawar", "Anuj", "" ] ]
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1401.1128
Pasquale Cilibrizzi
P. Cilibrizzi, H. Ohadi, T. Ostatnicky, A. Askitopoulos, W. Langbein, P. Lagoudakis
Linear wave dynamics explains observations attributed to dark-solitons in a polariton quantum fluid
Article + Supplementary Information (tot. 18 pages)
Phys. Rev. Lett. 113, 103901 (2014)
10.1103/PhysRevLett.113.103901
null
physics.optics cond-mat.quant-gas
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We investigate the propagation and scattering of polaritons in a planar GaAs microcavity in the linear regime under resonant excitation. The propagation of the coherent polariton wave across an extended defect creates phase and intensity patterns with identical qualitative features previously attributed to dark and half-dark solitons of polaritons. We demonstrate that these features are observed for negligible nonlinearity (i.e., polariton-polariton interaction) and are, therefore, not sufficient to identify dark and half-dark solitons. A linear model based on the Maxwell equations is shown to reproduce the experimental observations.
[ { "created": "Mon, 6 Jan 2014 16:02:38 GMT", "version": "v1" }, { "created": "Fri, 19 Sep 2014 17:01:09 GMT", "version": "v2" } ]
2014-09-22
[ [ "Cilibrizzi", "P.", "" ], [ "Ohadi", "H.", "" ], [ "Ostatnicky", "T.", "" ], [ "Askitopoulos", "A.", "" ], [ "Langbein", "W.", "" ], [ "Lagoudakis", "P.", "" ] ]
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1401.1137
Fran\c{c}ois Caron
Fran\c{c}ois Caron and Emily B. Fox
Sparse graphs using exchangeable random measures
New title. Extended version
null
null
null
stat.ME cs.SI math.ST stat.ML stat.TH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Statistical network modeling has focused on representing the graph as a discrete structure, namely the adjacency matrix, and considering the exchangeability of this array. In such cases, the Aldous-Hoover representation theorem (Aldous, 1981;Hoover, 1979} applies and informs us that the graph is necessarily either dense or empty. In this paper, we instead consider representing the graph as a measure on $\mathbb{R}_+^2$. For the associated definition of exchangeability in this continuous space, we rely on the Kallenberg representation theorem (Kallenberg, 2005). We show that for certain choices of such exchangeable random measures underlying our graph construction, our network process is sparse with power-law degree distribution. In particular, we build on the framework of completely random measures (CRMs) and use the theory associated with such processes to derive important network properties, such as an urn representation for our analysis and network simulation. Our theoretical results are explored empirically and compared to common network models. We then present a Hamiltonian Monte Carlo algorithm for efficient exploration of the posterior distribution and demonstrate that we are able to recover graphs ranging from dense to sparse--and perform associated tests--based on our flexible CRM-based formulation. We explore network properties in a range of real datasets, including Facebook social circles, a political blogosphere, protein networks, citation networks, and world wide web networks, including networks with hundreds of thousands of nodes and millions of edges.
[ { "created": "Mon, 6 Jan 2014 16:57:16 GMT", "version": "v1" }, { "created": "Wed, 9 Apr 2014 15:13:26 GMT", "version": "v2" }, { "created": "Fri, 27 Mar 2015 12:40:04 GMT", "version": "v3" } ]
2016-02-22
[ [ "Caron", "François", "" ], [ "Fox", "Emily B.", "" ] ]
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1401.1138
Adrian Ispas
Adrian Ispas, Christian Schneider, Gerd Ascheid, Reiner Thom\"a
Analysis of the Local Quasi-Stationarity of Measured Dual-Polarized MIMO Channels
null
null
10.1109/TVT.2014.2358942
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
It is common practice in wireless communications to assume strict or wide-sense stationarity of the wireless channel in time and frequency. While this approximation has some physical justification, it is only valid inside certain time-frequency regions. This paper presents an elaborate characterization of the non-stationarity of wireless dual-polarized channels in time. The evaluation is based on urban macrocell measurements performed at 2.53 GHz. In order to define local quasi-stationarity (LQS) regions, i.e., regions in which the change of certain channel statistics is deemed insignificant, we resort to the performance degradation of selected algorithms specific to channel estimation and beamforming. Additionally, we compare our results to commonly used measures in the literature. We find that the polarization, the antenna spacing, and the opening angle of the antennas into the propagation channel can strongly influence the non-stationarity of the observed channel. The obtained LQS regions can be of significant size, i.e., several meters, and thus the reuse of channel statistics over large distances is meaningful (in an average sense) for certain algorithms. Furthermore, we conclude that, from a system perspective, a proper non-stationarity analysis should be based on the considered algorithm.
[ { "created": "Mon, 6 Jan 2014 17:01:25 GMT", "version": "v1" } ]
2014-09-19
[ [ "Ispas", "Adrian", "" ], [ "Schneider", "Christian", "" ], [ "Ascheid", "Gerd", "" ], [ "Thomä", "Reiner", "" ] ]
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1401.1139
Andrew Polonsky
Andrew Polonsky
Extensionality of lambda-*
25 pages
null
null
null
cs.LO
http://creativecommons.org/licenses/by-nc-sa/3.0/
We prove an extensionality theorem for the "type-in-type" dependent type theory with Sigma-types. We suggest that the extensional equality type be identified with the logical equivalence relation on the free term model of type theory.
[ { "created": "Mon, 6 Jan 2014 17:03:53 GMT", "version": "v1" } ]
2014-01-07
[ [ "Polonsky", "Andrew", "" ] ]
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1401.1140
Axel Bacher
Axel Bacher, Olivier Bodini, Alice Jacquot
Efficient random sampling of binary and unary-binary trees via holonomic equations
null
null
null
null
cs.DS math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a new uniform random sampler for binary trees with $n$ internal nodes consuming $2n + \Theta(\log(n)^2)$ random bits on average. This makes it quasi-optimal and out-performs the classical Remy algorithm. We also present a sampler for unary-binary trees with $n$ nodes taking $\Theta(n)$ random bits on average. Both are the first linear-time algorithms to be optimal up to a constant.
[ { "created": "Mon, 6 Jan 2014 17:04:52 GMT", "version": "v1" }, { "created": "Tue, 7 Jan 2014 08:36:22 GMT", "version": "v2" } ]
2018-02-20
[ [ "Bacher", "Axel", "" ], [ "Bodini", "Olivier", "" ], [ "Jacquot", "Alice", "" ] ]
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1401.1148
Andrew Polonsky
Andrew Polonsky
Internalization of extensional equality
31 pages
null
null
null
cs.LO
http://creativecommons.org/licenses/by-nc-sa/3.0/
We give a type system in which the universe of types is closed by reflection into it of the logical relation defined externally by induction on the structure of types. This contribution is placed in the context of the search for a natural, syntactic construction of the extensional equality type (Tait [1995], Altenkirch [1999], Coquand [2011], Licata and Harper [2012], Martin-Lof [2013]). The system is presented as an extension of lambda-*, the terminal pure type system in which the universe of all types is a type. The universe inconsistency is then removed by the usual method of stratification into levels. We give a set-theoretic model for the stratified system. We conjecture that Strong Normalization holds as well.
[ { "created": "Mon, 6 Jan 2014 17:27:47 GMT", "version": "v1" }, { "created": "Wed, 5 Mar 2014 14:00:04 GMT", "version": "v2" }, { "created": "Fri, 20 Feb 2015 00:08:27 GMT", "version": "v3" } ]
2015-02-23
[ [ "Polonsky", "Andrew", "" ] ]
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1401.1152
Radek Stefan
Michal Bene\v{s}, Radek \v{S}tefan
Hygro-thermo-mechanical analysis of spalling in concrete walls at high temperatures as a moving boundary problem
null
null
10.1016/j.ijheatmasstransfer.2015.01.050
null
cs.CE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A mathematical model allowing coupled hygro-thermo-mechanical analysis of spalling in concrete walls at high temperatures by means of the moving boundary problem is presented. A simplified mechanical approach to account for effects of thermal stresses and pore pressure build-up on spalling is incorporated into the model. The numerical algorithm based on finite element discretization in space and the semi-implicit method for discretization in time is presented. The validity of the developed model is carefully examined by a comparison between experimental tests performed by Kalifa et al. (2000) and Mindeguia (2009) on concrete prismatic specimens under unidirectional heating of temperature of 600 ${\deg}$C and ISO 834 fire curve and the results obtained from the numerical model.
[ { "created": "Mon, 6 Jan 2014 17:42:41 GMT", "version": "v1" }, { "created": "Tue, 7 Jan 2014 08:46:25 GMT", "version": "v2" }, { "created": "Fri, 9 Jan 2015 14:24:19 GMT", "version": "v3" } ]
2015-02-13
[ [ "Beneš", "Michal", "" ], [ "Štefan", "Radek", "" ] ]
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1401.1154
Franco Ferrari
Franco Ferrari and Yani Zhao
Monte Carlo Computation of the Vassiliev knot invariant of degree 2 in the integral representation
35 pages, 13 figures, LaTeX + RevTeX 4.1, a mistake in the name of one of the authors has been corrected
null
null
null
math.NA cs.NA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In mathematics there is a wide class of knot invariants that may be expressed in the form of multiple line integrals computed along the trajectory C describing the spatial conformation of the knot. In this work it is addressed the problem of evaluating invariants of this kind in the case in which the knot is discrete, i.e. its trajectory is constructed by joining together a set of segments of constant length. Such discrete knots appear almost everywhere in numerical simulations of systems containing one dimensional ring-shaped objects. Examples are polymers, the vortex lines in fluids and superfluids like helium and other quantum liquids. Formally, the trajectory of a discrete knot is a piecewise smooth curve characterized by sharp corners at the joints between contiguous segments. The presence of these corners spoils the topological invariance of the knot invariants considered here and prevents the correct evaluation of their values. To solve this problem, a smoothing procedure is presented, which eliminates the sharp corners and transforms the original path C into a curve that is everywhere differentiable. The procedure is quite general and can be applied to any discrete knot defined off or on lattice. This smoothing algorithm is applied to the computation of the Vassiliev knot invariant of degree 2 denoted here with the symbol r(C). This is the simplest knot invariant that admits a definition in terms of multiple line integrals. For a fast derivation of r(C), it is used a Monte Carlo integration technique. It is shown that, after the smoothing, the values of r(C) may be evaluated with an arbitrary precision. Several algorithms for the fast computation of the Vassiliev knot invariant of degree 2 are provided.
[ { "created": "Mon, 6 Jan 2014 17:45:17 GMT", "version": "v1" }, { "created": "Tue, 7 Jan 2014 10:00:21 GMT", "version": "v2" } ]
2014-01-09
[ [ "Ferrari", "Franco", "" ], [ "Zhao", "Yani", "" ] ]
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1401.1158
Benjamin Roth
Benjamin Roth, Tassilo Barth, Michael Wiegand, Mittul Singh, Dietrich Klakow
Effective Slot Filling Based on Shallow Distant Supervision Methods
to be published in: Proceedings of the Sixth Text Analysis Conference (TAC 2013)
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cs.CL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Spoken Language Systems at Saarland University (LSV) participated this year with 5 runs at the TAC KBP English slot filling track. Effective algorithms for all parts of the pipeline, from document retrieval to relation prediction and response post-processing, are bundled in a modular end-to-end relation extraction system called RelationFactory. The main run solely focuses on shallow techniques and achieved significant improvements over LSV's last year's system, while using the same training data and patterns. Improvements mainly have been obtained by a feature representation focusing on surface skip n-grams and improved scoring for extracted distant supervision patterns. Important factors for effective extraction are the training and tuning scheme for distant supervision classifiers, and the query expansion by a translation model based on Wikipedia links. In the TAC KBP 2013 English Slotfilling evaluation, the submitted main run of the LSV RelationFactory system achieved the top-ranked F1-score of 37.3%.
[ { "created": "Mon, 6 Jan 2014 18:03:11 GMT", "version": "v1" } ]
2014-01-07
[ [ "Roth", "Benjamin", "" ], [ "Barth", "Tassilo", "" ], [ "Wiegand", "Michael", "" ], [ "Singh", "Mittul", "" ], [ "Klakow", "Dietrich", "" ] ]
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1401.1163
Matthias W\"ahlisch
Emmanuel Baccelli, Felix Juraschek, Oliver Hahm, Thomas C. Schmidt, Heiko Will, and Matthias W\"ahlisch
Proceedings of the 3rd MANIAC Challenge, Berlin, Germany, July 27 - 28, 2013
null
null
null
null
cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This is the Proceedings of the 3rd MANIAC Challenge, which was held in Berlin, Germany, July 27 - 28, 2013.
[ { "created": "Mon, 6 Jan 2014 18:40:43 GMT", "version": "v1" }, { "created": "Wed, 8 Jan 2014 19:31:13 GMT", "version": "v2" } ]
2014-01-09
[ [ "Baccelli", "Emmanuel", "" ], [ "Juraschek", "Felix", "" ], [ "Hahm", "Oliver", "" ], [ "Schmidt", "Thomas C.", "" ], [ "Will", "Heiko", "" ], [ "Wählisch", "Matthias", "" ] ]
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1401.1170
Kui Ren
Charles Radin and Kui Ren and Lorenzo Sadun
The Asymptotics of Large Constrained Graphs
null
J. Phys. A: Math. Theor., 47, 2014, 175001
10.1088/1751-8113/47/17/175001
null
math.CO cs.SI math-ph math.MP
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We show, through local estimates and simulation, that if one constrains simple graphs by their densities $\varepsilon$ of edges and $\tau$ of triangles, then asymptotically (in the number of vertices) for over $95\%$ of the possible range of those densities there is a well-defined typical graph, and it has a very simple structure: the vertices are decomposed into two subsets $V_1$ and $V_2$ of fixed relative size $c$ and $1-c$, and there are well-defined probabilities of edges, $g_{jk}$, between $v_j\in V_j$, and $v_k\in V_k$. Furthermore the four parameters $c, g_{11}, g_{22}$ and $g_{12}$ are smooth functions of $(\varepsilon,\tau)$ except at two smooth `phase transition' curves.
[ { "created": "Mon, 6 Jan 2014 19:11:41 GMT", "version": "v1" }, { "created": "Sat, 1 Mar 2014 01:50:28 GMT", "version": "v2" } ]
2017-03-16
[ [ "Radin", "Charles", "" ], [ "Ren", "Kui", "" ], [ "Sadun", "Lorenzo", "" ] ]
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1401.1171
Zhenhua Yu
Zhenhua Yu, Arthur J. Redfern, and G. Tong Zhou
Using Delta-Sigma Modulators in Visible Light OFDM Systems
Accepted by IEEE Wireless and Optical Communication Conference (WOCC 2014), Newark, New Jersey, May 2014
null
10.1109/WOCC.2014.6839942
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Visible light communications (VLC) are motivated by the radio-frequency (RF) spectrum crunch and fast-growing solid-state lighting technology. VLC relies on white light emitting diodes (LEDs) to provide communication and illumination simultaneously. Simple two-level on-off keying (OOK) and pulse-position modulation (PPM) are supported in IEEE standard due to their compatibility with existing constant current LED drivers, but their low spectral efficiency have limited the achievable data rates of VLC. Orthogonal frequency division multiplexing (OFDM) has been applied to VLC due to its high spectral efficiency and ability to combat inter-symbol-interference (ISI). However, VLC-OFDM inherits the disadvantage of high peak-to-average power ratio (PAPR) from RF-OFDM. Besides, the continuous magnitude of OFDM signals requires complicated mixed-signal digital-to-analog converter (DAC) and modification of LED drivers. We propose the use of delta-sigma modulators in visible light OFDM systems to convert continuous magnitude OFDM symbols into LED driver signals. The proposed system has the communication theory advantages of OFDM along with the practical analog and optical advantages of simple two level driver signals. Simulation results are provided to illustrate the proposed system.
[ { "created": "Mon, 6 Jan 2014 19:23:30 GMT", "version": "v1" }, { "created": "Sun, 22 Jun 2014 17:57:13 GMT", "version": "v2" } ]
2014-06-25
[ [ "Yu", "Zhenhua", "" ], [ "Redfern", "Arthur J.", "" ], [ "Zhou", "G. Tong", "" ] ]
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1401.1174
Hessam Zakerzadeh
Hessam Zakerzadeh, Charu C. Aggrawal and Ken Barker
Towards Breaking the Curse of Dimensionality for High-Dimensional Privacy: An Extended Version
13 pages, An extended version of the paper accepted in 2014 SIAM international conference on Data Mining
null
null
null
cs.DB
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The curse of dimensionality has remained a challenge for a wide variety of algorithms in data mining, clustering, classification and privacy. Recently, it was shown that an increasing dimensionality makes the data resistant to effective privacy. The theoretical results seem to suggest that the dimensionality curse is a fundamental barrier to privacy preservation. However, in practice, we show that some of the common properties of real data can be leveraged in order to greatly ameliorate the negative effects of the curse of dimensionality. In real data sets, many dimensions contain high levels of inter-attribute correlations. Such correlations enable the use of a process known as vertical fragmentation in order to decompose the data into vertical subsets of smaller dimensionality. An information-theoretic criterion of mutual information is used in the vertical decomposition process. This allows the use of an anonymization process, which is based on combining results from multiple independent fragments. We present a general approach which can be applied to the k-anonymity, l-diversity, and t-closeness models. In the presence of inter-attribute correlations, such an approach continues to be much more robust in higher dimensionality, without losing accuracy. We present experimental results illustrating the effectiveness of the approach. This approach is resilient enough to prevent identity, attribute, and membership disclosure attack.
[ { "created": "Mon, 6 Jan 2014 19:35:23 GMT", "version": "v1" } ]
2014-01-07
[ [ "Zakerzadeh", "Hessam", "" ], [ "Aggrawal", "Charu C.", "" ], [ "Barker", "Ken", "" ] ]
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1401.1178
Paolo Marconcini
Demetrio Logoteta, Paolo Marconcini, Claudio Bonati, Maurizio Fagotti, Massimo Macucci
High-performance solution of the transport problem in a graphene armchair structure with a generic potential
12 pages, 6 eps figures. Final published version. Comments and comparisons added
Phys. Rev. E 89, 063309 (2014)
10.1103/PhysRevE.89.063309
null
cond-mat.mes-hall physics.comp-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose an efficient numerical method to study the transport properties of armchair graphene ribbons in the presence of a generic external potential. The method is based on a continuum envelope-function description with physical boundary conditions. The envelope functions are computed in the reciprocal space, and the transmission is then obtained with a recursive scattering matrix approach. This allows a significant reduction of the computational time with respect to finite difference simulations.
[ { "created": "Mon, 6 Jan 2014 19:55:24 GMT", "version": "v1" }, { "created": "Thu, 3 Jul 2014 20:34:35 GMT", "version": "v2" } ]
2014-07-07
[ [ "Logoteta", "Demetrio", "" ], [ "Marconcini", "Paolo", "" ], [ "Bonati", "Claudio", "" ], [ "Fagotti", "Maurizio", "" ], [ "Macucci", "Massimo", "" ] ]
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1401.1190
Purnendu Banerjee
Souvik Bhowmick, Purnendu Banerjee
Bangla Text Recognition from Video Sequence: A New Focus
null
NATIONAL CONFERENCE ON COMPUTING AND SYSTEMS (NaCCS), pp. 62-67,2012
null
null
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Extraction and recognition of Bangla text from video frame images is challenging due to complex color background, low-resolution etc. In this paper, we propose an algorithm for extraction and recognition of Bangla text form such video frames with complex background. Here, a two-step approach has been proposed. First, the text line is segmented into words using information based on line contours. First order gradient value of the text blocks are used to find the word gap. Next, a local binarization technique is applied on each word and text line is reconstructed using those words. Secondly, this binarized text block is sent to OCR for recognition purpose.
[ { "created": "Mon, 6 Jan 2014 20:25:26 GMT", "version": "v1" } ]
2014-01-07
[ [ "Bhowmick", "Souvik", "" ], [ "Banerjee", "Purnendu", "" ] ]
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1401.1198
Josh May
Josh May, John Tonge, Warren B. Mori, Frederico Fi\'uza, Ricardo A. Fonseca, Lu\'is O. Silva and Chuang Ren
Enhanced Stopping of Macro-Particles in Particle-in-Cell Simulations
29 pages, 7 figures; v2 - added reference; v3 - improved fig. 1&2
null
10.1063/1.4875708
null
physics.plasm-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We derive an equation for energy transfer from relativistic charged particles to a cold background plasma appropriate for finite-size particles that are used in particle-in-cell simulation codes. Expressions for one-, two-, and three-dimensional particles are presented, with special attention given to the two-dimensional case. This energy transfer is due to the electric field of the wake set up in the background plasma by the relativistic particle. The enhanced stopping is dependent on the $q^2/m$, where $q$ is the charge and $m$ is the mass of the relativistic particle, and therefore simulation macro-particles with large charge but identical $q/m$ will stop more rapidly. The stopping power also depends on the effective particle shape of the macro-particle. These conclusions are verified in particle-in-cell simulations. We present 2D simulations of test particles, relaxation of high-energy tails, and integrated fast ignition simulations showing that the enhanced drag on macro-particles may adversely affect the results of these simulations in a wide range of high-energy density plasma scenarios. We also describe a particle splitting algorithm which can potentially overcome this problem and show its effect in controlling the stopping of macro-particles.
[ { "created": "Mon, 6 Jan 2014 20:57:03 GMT", "version": "v1" }, { "created": "Wed, 8 Jan 2014 00:12:13 GMT", "version": "v2" }, { "created": "Wed, 22 Jan 2014 21:28:00 GMT", "version": "v3" } ]
2015-06-18
[ [ "May", "Josh", "" ], [ "Tonge", "John", "" ], [ "Mori", "Warren B.", "" ], [ "Fiúza", "Frederico", "" ], [ "Fonseca", "Ricardo A.", "" ], [ "Silva", "Luís O.", "" ], [ "Ren", "Chuang", "" ] ]
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1401.1203
Zhiyang Liu
Zhiyang Liu, Lin Dai
A Comparative Study of Downlink MIMO Cellular Networks with Co-located and Distributed Base-Station Antennas
Submitted to IEEE Transactions on Wireless Communications
null
10.1109/TWC.2014.2355833
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Despite the common belief that substantial capacity gains can be achieved by using more antennas at the base-station (BS) side in cellular networks, the effect of BS antenna topology on the capacity scaling behavior is little understood. In this paper, we present a comparative study on the ergodic capacity of a downlink single-user multiple-input-multiple-output (MIMO) system where BS antennas are either co-located at the center or grouped into uniformly distributed antenna clusters in a circular cell. By assuming that the number of BS antennas and the number of user antennas go to infinity with a fixed ratio $L\gg 1$, the asymptotic analysis reveals that the average per-antenna capacities in both cases logarithmically increase with $L$, but in the orders of $\log_2 L$ and $\tfrac{\alpha}{2}\log_2 L$, for the co-located and distributed BS antenna layouts, respectively, where $\alpha>2$ denotes the path-loss factor. The analysis is further extended to the multi-user case where a 1-tier (7-cell) MIMO cellular network with $K\gg 1$ uniformly distributed users in each cell is considered. By assuming that the number of BS antennas and the number of user antennas go to infinity with a fixed ratio $L\gg K$, an asymptotic analysis is presented on the downlink rate performance with block diagonalization (BD) adopted at each BS. It is shown that the average per-antenna rates with the co-located and distributed BS antenna layouts scale in the orders of $\log_2 \tfrac{L}{K}$ and $\log_2 \frac{(L-K+1)^{\alpha/2}}{K}$, respectively. The rate performance of MIMO cellular networks with small cells is also discussed, which highlights the importance of employing a large number of distributed BS antennas for the next-generation cellular networks.
[ { "created": "Sun, 5 Jan 2014 14:02:07 GMT", "version": "v1" }, { "created": "Mon, 9 Jun 2014 14:29:59 GMT", "version": "v2" } ]
2014-10-07
[ [ "Liu", "Zhiyang", "" ], [ "Dai", "Lin", "" ] ]
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1401.1204
Denis Sipp
Cl\'ement Mettot and Florent Renac and Denis Sipp
Computation of eigenvalue sensitivity to base flow modifications in a discrete framework: Application to open-loop control
null
null
10.1016/j.jcp.2014.03.022
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A fully discrete formalism is introduced to perform stability analysis of a turbulent compressible flow whom dynamics is modeled with the Reynolds-Averaged Navier-Stokes (RANS) equations. The discrete equations are linearized using finite differences and the Jacobian is computed using repeated evaluation of the residuals. Stability of the flow is assessed solving an eigenvalue problem. The sensitivity gradients which indicate regions of the flow where a passive control device could stabilize the unstable eigenvalues are defined within this fully discrete framework. Second order finite differences are applied to the discrete residual to compute the gradients. In particular, the sensitivity gradients are shown to be linked to the Hessian of the RANS equations. The introduced formalism and linearization method are generic: the code used to evaluate the residual of the RANS equations can be used in a black box manner, and the complex linearization of the Hessian is avoided. The method is tested on a two dimensional deep cavity case, the flow is turbulent with a Reynolds number equal to 860 000 and compressible with a Mach number of 0.8. Several turbulence models and numerical schemes are used to validate the method. Physical features of the flow are recovered, such as the fundamental frequency of the natural flow as well as acoustic mechanisms, suggesting the validity of the method. The sensitivity gradients are then computed and validated, the error in predicting the eigenvalue variation being found less than 3\%. Control maps using a small steady control device are finally obtained, indicating that the control area should be chosen in the vicinity of the leading edge of the cavity.
[ { "created": "Sun, 5 Jan 2014 20:58:49 GMT", "version": "v1" } ]
2015-06-18
[ [ "Mettot", "Clément", "" ], [ "Renac", "Florent", "" ], [ "Sipp", "Denis", "" ] ]
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1401.1205
Young S Kim
S. Baskal and Y. S. Kim
Lens optics and the continuity problems of the ABCD matrix
Latex 11 pages with 2 figures, to be published in the Journal of Modern Optics
null
10.1080/09500340.2014.880524
null
physics.optics quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Paraxial lens optics is discussed to study the continuity properties of the $ABCD$ beam transfer matrix. The two-by-two matrix for the one-lens camera-like system can be converted to an equi-diagonal form by a scale transformation, leaving the off-diagonal elements invariant. It is shown that the matrix remains continuous during the focusing process, but this transition is not analytic. However, its first derivative is still continuous, which leads to the concept of "tangential continuity." It is then shown that this tangential continuity is applicable to $ABCD$ matrices pertinent to periodic optical systems, where the equi-diagonalization is achieved by a similarity transformation using rotations. It is also noted that both the scale transformations and the rotations can be unified within the framework of Hermitian transformations.
[ { "created": "Mon, 6 Jan 2014 14:52:10 GMT", "version": "v1" } ]
2015-06-18
[ [ "Baskal", "S.", "" ], [ "Kim", "Y. S.", "" ] ]
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1401.1206
Ming Liu
Ming Liu (IETR), Maryline H\'elard (IETR), Jean-Fran\c{c}ois H\'elard (IETR), Matthieu Crussi\`ere (IETR)
A Fast Decodable Full-Rate STBC with High Coding Gain for 4x2 MIMO Systems
2013 IEEE 24th International Symposium on Personal Indoor and Mobile Radio Communications (PIMRC), London : United Kingdom (2013)
null
10.1109/PIMRC.2013.6666222
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this work, a new fast-decodable space-time block code (STBC) is proposed. The code is full-rate and full-diversity for 4x2 multiple-input multiple-output (MIMO) transmission. Due to the unique structure of the codeword, the proposed code requires a much lower computational complexity to provide maximum-likelihood (ML) decoding performance. It is shown that the ML decoding complexity is only O(M^{4.5}) when M-ary square QAM constellation is used. Finally, the proposed code has highest minimum determinant among the fast-decodable STBCs known in the literature. Simulation results prove that the proposed code provides the best bit error rate (BER) performance among the state-of-the-art STBCs.
[ { "created": "Mon, 6 Jan 2014 20:04:19 GMT", "version": "v1" } ]
2014-01-08
[ [ "Liu", "Ming", "", "IETR" ], [ "Hélard", "Maryline", "", "IETR" ], [ "Hélard", "Jean-François", "", "IETR" ], [ "Crussière", "Matthieu", "", "IETR" ] ]
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1401.1225
Kolja Knauer
Bart{\l}omiej Bosek, Stefan Felsner, Kolja Knauer, Grzegorz Matecki
On the Duality of Semiantichains and Unichain Coverings
10 pages, 3 figures
null
null
null
math.CO cs.DM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study a min-max relation conjectured by Saks and West: For any two posets $P$ and $Q$ the size of a maximum semiantichain and the size of a minimum unichain covering in the product $P\times Q$ are equal. For positive we state conditions on $P$ and $Q$ that imply the min-max relation. Based on these conditions we identify some new families of posets where the conjecture holds and get easy proofs for several instances where the conjecture had been verified before. However, we also have examples showing that in general the min-max relation is false, i.e., we disprove the Saks-West conjecture.
[ { "created": "Mon, 6 Jan 2014 21:13:41 GMT", "version": "v1" } ]
2014-01-08
[ [ "Bosek", "Bartłomiej", "" ], [ "Felsner", "Stefan", "" ], [ "Knauer", "Kolja", "" ], [ "Matecki", "Grzegorz", "" ] ]
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1401.1227
Andrei Afanasev
Andrei Afanasev, Carl E. Carlson, and Asmita Mukherjee
Novel Properties of Twisted-Light Absorption
8 pages, 3 figures; completed formalism for the radiation pressure
J. Opt. Soc. Am. B, Vol. 31, 2721-2727 (2014)
10.1364/JOSAB.31.002721
null
quant-ph physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We discuss novel features of twisted-light absorption both by hydrogen-like atoms and by micro-particles. First, we extend the treatment of atomic photoexcitation by twisted photons to include atomic recoil, derive generalized quantum selection rules and consider phenomena of forbidden atomic transitions. Second, using the same electromagnetic potential for the twisted light beams, we analyze the radiation pressure from these beams on micro-sized particles, and verify that while the Poynting vector can in some circumstances point back toward the source, a complete analysis nonetheless gives a repulsive radiation pressure.
[ { "created": "Mon, 6 Jan 2014 21:44:48 GMT", "version": "v1" }, { "created": "Mon, 28 Apr 2014 23:47:23 GMT", "version": "v2" } ]
2014-10-17
[ [ "Afanasev", "Andrei", "" ], [ "Carlson", "Carl E.", "" ], [ "Mukherjee", "Asmita", "" ] ]
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1401.1232
Yeray Cachon YC
Yeray Cachon Santana
A Cryptographic Scheme Of Mellin Transform
Cryptography using Mellin's transform
null
null
null
cs.CR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper it has been developed an algorithm for cryptography, using the Mellin's transform. Cryptography is very important to protect data to ensure that two people, using an insecure channel, may communicate in a secure way. In the present age, ensure the communications will essential to shared data that have to be protected. The original message is a plain text, and the encrypted form as cipher text. The cipher text message contains all the information of the plain text, but is cannot be read from a human without a key and a method to decrypt it.
[ { "created": "Mon, 6 Jan 2014 22:50:30 GMT", "version": "v1" } ]
2014-01-08
[ [ "Santana", "Yeray Cachon", "" ] ]
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1401.1234
Edriss Titi
Chongsheng Cao, Jinkai Li and Edriss S. Titi
Global Well-posedness of Strong Solutions to the 3D Primitive Equations with Horizontal Eddy Diffusivity
arXiv admin note: substantial text overlap with arXiv:1312.6035
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math.AP physics.ao-ph physics.flu-dyn physics.geo-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we consider the initial-boundary value problem of the 3D primitive equations for oceanic and atmospheric dynamics with only horizontal diffusion in the temperature equation. Global well-posedness of strong solutions are established with $H^2$ initial data.
[ { "created": "Mon, 6 Jan 2014 22:55:18 GMT", "version": "v1" } ]
2014-01-08
[ [ "Cao", "Chongsheng", "" ], [ "Li", "Jinkai", "" ], [ "Titi", "Edriss S.", "" ] ]
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1401.1236
Sergio G\'omez
Sergio Gomez, Alberto Fernandez, Clara Granell, Alex Arenas
Structural patterns in complex systems using multidendrograms
null
Entropy 15 (2013) 5464-5474
10.3390/e15125464
null
physics.data-an cs.IR cs.SI physics.comp-ph physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Complex systems are usually represented as an intricate set of relations between their components forming a complex graph or network. The understanding of their functioning and emergent properties are strongly related to their structural properties. The finding of structural patterns is of utmost importance to reduce the problem of understanding the structure-function relationships. Here we propose the analysis of similarity measures between nodes using hierarchical clustering methods. The discrete nature of the networks usually leads to a small set of different similarity values, making standard hierarchical clustering algorithms ambiguous. We propose the use of "multidendrograms", an algorithm that computes agglomerative hierarchical clusterings implementing a variable-group technique that solves the non-uniqueness problem found in the standard pair-group algorithm. This problem arises when there are more than two clusters separated by the same maximum similarity (or minimum distance) during the agglomerative process. Forcing binary trees in this case means breaking ties in some way, thus giving rise to different output clusterings depending on the criterion used. Multidendrograms solves this problem grouping more than two clusters at the same time when ties occur.
[ { "created": "Mon, 6 Jan 2014 23:08:51 GMT", "version": "v1" } ]
2014-01-08
[ [ "Gomez", "Sergio", "" ], [ "Fernandez", "Alberto", "" ], [ "Granell", "Clara", "" ], [ "Arenas", "Alex", "" ] ]
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1401.1239
Behzad Asadi
Behzad Asadi, Lawrence Ong, and Sarah J. Johnson
The Capacity of Three-Receiver AWGN Broadcast Channels with Receiver Message Side Information
This is an extended version of the same-titled paper submitted to IEEE International Symposium on Information Theory (ISIT) 2014
Proceedings of the 2014 IEEE International Symposium on Information Theory (ISIT 2014), Honolulu, USA, pp. 2899-2903, June 29-July 4, 2014
10.1109/ISIT.2014.6875364
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper investigates the capacity region of three-receiver AWGN broadcast channels where the receivers (i) have private-message requests and (ii) know the messages requested by some other receivers as side information. We classify these channels based on their side information into eight groups, and construct different transmission schemes for the groups. For six groups, we characterize the capacity region, and show that it improves both the best known inner and outer bounds. For the remaining two groups, we improve the best known inner bound by using side information during channel decoding at the receivers.
[ { "created": "Mon, 6 Jan 2014 23:45:43 GMT", "version": "v1" } ]
2014-09-04
[ [ "Asadi", "Behzad", "" ], [ "Ong", "Lawrence", "" ], [ "Johnson", "Sarah J.", "" ] ]
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1401.1241
Rodrigo Angelo Muniz
Rodrigo A. Muniz and J. E. Sipe
Coherent control of optical injection of spin and currents in topological insulators
10 pages, 4 figures
Phys. Rev. B 89, 205113 (2014)
10.1103/PhysRevB.89.205113
null
cond-mat.mes-hall cond-mat.mtrl-sci physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Topological insulators have surface states with a remarkable helical spin structure, with promising prospects for applications in spintronics. Strategies for generating spin polarized currents, such as the use of magnetic contacts and photoinjection, have been the focus of extensive research. While several optical methods for injecting currents have been explored, they have all focused on one-photon absorption. Here we consider the use of both a fundamental optical field and its second harmonic, which allows the injection of spin polarized carriers and current by a nonlinear process involving quantum interference between one- and two-photon absorption. General expressions are derived for the injection rates in a generic two-band system, including those for one- and two-photon absorption processes as well as their interference. Results are given for carrier, spin density and current injection rates on the surface of topological insulators, for both linearly and circularly polarized light. We identify the conditions that would be necessary for experimentally verifying these predictions.
[ { "created": "Mon, 6 Jan 2014 23:50:13 GMT", "version": "v1" } ]
2014-05-21
[ [ "Muniz", "Rodrigo A.", "" ], [ "Sipe", "J. E.", "" ] ]
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1401.1247
Guy Van den Broeck
Mathias Niepert and Guy Van den Broeck
Tractability through Exchangeability: A New Perspective on Efficient Probabilistic Inference
In Proceedings of the 28th AAAI Conference on Artificial Intelligence
null
null
null
cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Exchangeability is a central notion in statistics and probability theory. The assumption that an infinite sequence of data points is exchangeable is at the core of Bayesian statistics. However, finite exchangeability as a statistical property that renders probabilistic inference tractable is less well-understood. We develop a theory of finite exchangeability and its relation to tractable probabilistic inference. The theory is complementary to that of independence and conditional independence. We show that tractable inference in probabilistic models with high treewidth and millions of variables can be understood using the notion of finite (partial) exchangeability. We also show that existing lifted inference algorithms implicitly utilize a combination of conditional independence and partial exchangeability.
[ { "created": "Tue, 7 Jan 2014 00:30:25 GMT", "version": "v1" }, { "created": "Tue, 22 Apr 2014 22:21:16 GMT", "version": "v2" } ]
2014-04-24
[ [ "Niepert", "Mathias", "" ], [ "Broeck", "Guy Van den", "" ] ]
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1401.1254
Xianhai Lu
Xianhai Lu, Yingchao Du, Wenhui Huang, Chuanxiang Tang
Bunch evolution study in optimization of MeV ultrafast electron diffraction
null
null
10.1088/1674-1137/38/12/128201
null
physics.acc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Megaelectronvolt ultrafast electron diffraction (UED) is a promising detection tool for ultrafast processes. The quality of diffraction image is determined by the transverse evolution of the probe bunch. In this paper, we study the contributing terms of the emittance and space charge effects to the bunch evolution in MeV UED scheme, employing a mean-field model with an ellipsoidal distribution as well as particle tracking simulation. Small transverse dimension of the drive laser is found critical to improve the reciprocal resolution, exploiting both smaller emittance and larger transverse bunch size before the solenoid. The degradation of reciprocal spatial resolution caused by the space charge effects should be carefully controlled.
[ { "created": "Tue, 7 Jan 2014 02:04:53 GMT", "version": "v1" } ]
2015-06-18
[ [ "Lu", "Xianhai", "" ], [ "Du", "Yingchao", "" ], [ "Huang", "Wenhui", "" ], [ "Tang", "Chuanxiang", "" ] ]
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1401.1257
Yong-Yeol Ahn
Azadeh Nematzadeh, Emilio Ferrara, Alessandro Flammini, Yong-Yeol Ahn
Optimal network modularity for information diffusion
8 pages, 10 figures
Phys. Rev. Lett. 113, 088701 (2014)
10.1103/PhysRevLett.113.088701
null
physics.soc-ph cs.SI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We investigate the impact of community structure on information diffusion with the linear threshold model. Our results demonstrate that modular structure may have counter-intuitive effects on information diffusion when social reinforcement is present. We show that strong communities can facilitate global diffusion by enhancing local, intra-community spreading. Using both analytic approaches and numerical simulations, we demonstrate the existence of an optimal network modularity, where global diffusion require the minimal number of early adopters.
[ { "created": "Tue, 7 Jan 2014 02:53:21 GMT", "version": "v1" }, { "created": "Thu, 10 Jul 2014 02:23:23 GMT", "version": "v2" }, { "created": "Thu, 18 Sep 2014 13:19:59 GMT", "version": "v3" } ]
2014-09-19
[ [ "Nematzadeh", "Azadeh", "" ], [ "Ferrara", "Emilio", "" ], [ "Flammini", "Alessandro", "" ], [ "Ahn", "Yong-Yeol", "" ] ]
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1401.1258
Karim Habak
Karim Habak, Khaled A. Harras and Moustafa Youssef
OSCAR: A Collaborative Bandwidth Aggregation System
null
null
null
null
cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The exponential increase in mobile data demand, coupled with growing user expectation to be connected in all places at all times, have introduced novel challenges for researchers to address. Fortunately, the wide spread deployment of various network technologies and the increased adoption of multi-interface enabled devices have enabled researchers to develop solutions for those challenges. Such solutions aim to exploit available interfaces on such devices in both solitary and collaborative forms. These solutions, however, have faced a steep deployment barrier. In this paper, we present OSCAR, a multi-objective, incentive-based, collaborative, and deployable bandwidth aggregation system. We present the OSCAR architecture that does not introduce any intermediate hardware nor require changes to current applications or legacy servers. The OSCAR architecture is designed to automatically estimate the system's context, dynamically schedule various connections and/or packets to different interfaces, be backwards compatible with the current Internet architecture, and provide the user with incentives for collaboration. We also formulate the OSCAR scheduler as a multi-objective, multi-modal scheduler that maximizes system throughput while minimizing energy consumption or financial cost. We evaluate OSCAR via implementation on Linux, as well as via simulation, and compare our results to the current optimal achievable throughput, cost, and energy consumption. Our evaluation shows that, in the throughput maximization mode, we provide up to 150% enhancement in throughput compared to current operating systems, without any changes to legacy servers. Moreover, this performance gain further increases with the availability of connection resume-supporting, or OSCAR-enabled servers, reaching the maximum achievable upper-bound throughput.
[ { "created": "Tue, 7 Jan 2014 03:08:01 GMT", "version": "v1" } ]
2014-02-13
[ [ "Habak", "Karim", "" ], [ "Harras", "Khaled A.", "" ], [ "Youssef", "Moustafa", "" ] ]
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1401.1259
Wu Zhi-Xi
Zhi-Xi Wu and Han-Xin Yang
Social dilemma alleviated by sharing the gains with immediate neighbors
9 pages, 4 figures
PhysRevE.89.012109(2014)
10.1103/PhysRevE.89.012109
null
physics.soc-ph nlin.AO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the evolution of cooperation in the evolutionary spatial prisoner's dilemma game (PDG) and snowdrift game (SG), within which a fraction $\alpha$ of the payoffs of each player gained from direct game interactions is shared equally by the immediate neighbors. The magnitude of the parameter $\alpha$ therefore characterizes the degree of the relatedness among the neighboring players. By means of extensive Monte Carlo simulations as well as an extended mean-field approximation method, we trace the frequency of cooperation in the stationary state. We find that plugging into relatedness can significantly promote the evolution of cooperation in the context of both studied games. Unexpectedly, cooperation can be more readily established in the spatial PDG than that in the spatial SG, given that the degree of relatedness and the cost-to-benefit ratio of mutual cooperation are properly formulated. The relevance of our model with the stakeholder theory is also briefly discussed.
[ { "created": "Tue, 7 Jan 2014 03:13:50 GMT", "version": "v1" } ]
2014-01-13
[ [ "Wu", "Zhi-Xi", "" ], [ "Yang", "Han-Xin", "" ] ]
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1401.1274
Liang Gao Dr.
Liang Gao, Chaoming Song, Ziyou Gao, Albert-L\'aszl\'o Barab\'asi, James P. Bagrow, Dashun Wang
Quantifying Information Flow During Emergencies
Under review in Scientific Reports
Scientific Reports 4, 3997 2014
10.1038/srep03997
null
physics.soc-ph cs.SI
http://creativecommons.org/licenses/by-nc-sa/3.0/
Recent advances on human dynamics have focused on the normal patterns of human activities, with the quantitative understanding of human behavior under extreme events remaining a crucial missing chapter. This has a wide array of potential applications, ranging from emergency response and detection to traffic control and management. Previous studies have shown that human communications are both temporally and spatially localized following the onset of emergencies, indicating that social propagation is a primary means to propagate situational awareness. We study real anomalous events using country-wide mobile phone data, finding that information flow during emergencies is dominated by repeated communications. We further demonstrate that the observed communication patterns cannot be explained by inherent reciprocity in social networks, and are universal across different demographics.
[ { "created": "Tue, 7 Jan 2014 05:16:37 GMT", "version": "v1" } ]
2014-06-27
[ [ "Gao", "Liang", "" ], [ "Song", "Chaoming", "" ], [ "Gao", "Ziyou", "" ], [ "Barabási", "Albert-László", "" ], [ "Bagrow", "James P.", "" ], [ "Wang", "Dashun", "" ] ]
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1401.1276
Tzuhsuan Ma
Tzuhsuan Ma, Alexander B. Khanikaev, S. Hossein Mousavi, Gennady Shvets
Topologically protected photonic transport in bi-anisotropic meta-waveguides
13 pages, 4 figures
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physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose a design of two-dimensional bi-anisotropic meta-waveguide exhibiting topologically nontrivial photonic phase and robust photonic transport. The structure proposed represents a waveguide formed by a periodic array of metallic cylinders placed inside parallel metal plates and is designed to support two pairs of Dirac cones thus allowing emulation of the spin of the electrons in condensed matter systems. It is shown, that by making the meta-waveguide bi-anisotropic one can mimic the spin-orbital interaction in topological insulators and open a complete photonic topological band gap. First-principle numerical simulations demonstrate that the domain walls between two meta-waveguides with reversed bi-anisotropy support photonic edge states robust against certain classes of structural imperfections, including sharp bends and disorder.
[ { "created": "Tue, 7 Jan 2014 05:36:15 GMT", "version": "v1" } ]
2014-01-08
[ [ "Ma", "Tzuhsuan", "" ], [ "Khanikaev", "Alexander B.", "" ], [ "Mousavi", "S. Hossein", "" ], [ "Shvets", "Gennady", "" ] ]
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1401.1288
Nobuyasu Shiga
Nobuyasu Shiga, Michiaki Mizuno, Kohta Kido, Piyaphat Phoonthong, Kunihiro Okada
Accelerating the Averaging Rate of Atomic Ensemble Clock Stability using Atomic Phase Lock
12 pages, 6 figures
New Journal of Physics 16 (2014) 073029
10.1088/1367-2630/16/7/073029
null
quant-ph physics.atom-ph physics.plasm-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We experimentally demonstrated that the stability of an atomic clock improves at fastest rate $\tau^{-1}$ (where $\tau$ is the averaging time) when the phase of a local oscillator is genuinely compared to the continuous phase of many atoms in a single trap (atomic phase lock). For this demonstration, we developed a simple method that repeatedly monitors the atomic phase while retaining its coherence by observing only a portion of the whole ion cloud. Using this new method, we measured the continuous phase over 3 measurement cycles, and thereby improved the stability scaling from $\tau^{-1/2}$ to $\tau^{-1}$ during the 3 measurement cycles. %Compared with the standard method that initialize phase during each measurement cycle, the long term stability was improved by a factor of $\sqrt{n_{cp}}$ (where $n_{cp}$ is the number of continuous phase measurements). This simple method provides a path by which atomic clocks can approach a quantum projection noise limit, even when the measurement noise is dominated by the technical noise.
[ { "created": "Tue, 7 Jan 2014 06:56:23 GMT", "version": "v1" }, { "created": "Fri, 27 Jun 2014 05:49:42 GMT", "version": "v2" } ]
2014-07-24
[ [ "Shiga", "Nobuyasu", "" ], [ "Mizuno", "Michiaki", "" ], [ "Kido", "Kohta", "" ], [ "Phoonthong", "Piyaphat", "" ], [ "Okada", "Kunihiro", "" ] ]
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1401.1289
J\"urgen M\"unch
Jens Heidrich and J\"urgen M\"unch
Implementing Software Project Control Centers: An Architectural View
14 pages. The final publication is available at http://link.springer.com/chapter/10.1007%2F978-3-540-89403-2_25
Software Process and Product Measurement, volume 5338 of Lecture Notes in Computer Science, pages 302-315. Springer Berlin Heidelberg, 2008
10.1007/978-3-540-89403-2_25
null
cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Setting up effective and efficient mechanisms for controlling software and system development projects is still challenging in industrial practice. On the one hand, necessary prerequisites such as established development processes, understanding of cause-effect relationships on relevant indicators, and sufficient sustainability of measurement programs are often missing. On the other hand, there are more fundamental methodological deficits related to the controlling process itself and to appropriate tool support. Additional activities that would guarantee the usefulness, completeness, and precision of the result- ing controlling data are widely missing. This article presents a conceptual architecture for so-called Software Project Control Centers (SPCC) that addresses these challenges. The architecture includes mechanisms for getting sufficiently precise and complete data and supporting the information needs of different stakeholders. In addition, an implementation of this architecture, the so-called Specula Project Support Environment, is sketched, and results from evaluating this implementation in industrial settings are presented.
[ { "created": "Tue, 7 Jan 2014 06:58:04 GMT", "version": "v1" } ]
2014-01-08
[ [ "Heidrich", "Jens", "" ], [ "Münch", "Jürgen", "" ] ]
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1401.1290
Garry Pantelis
Garry Pantelis
Program Verification of Numerical Computation
null
null
null
null
cs.MS cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
These notes outline a formal method for program verification of numerical computation. It forms the basis of the software package VPC in its initial phase of development. Much of the style of presentation is in the form of notes that outline the definitions and rules upon which VPC is based. The initial motivation of this project was to address some practical issues of computation, especially of numerically intensive programs that are commonplace in computer models. The project evolved into a wider area for program construction as proofs leading to a model of inference in a more general sense. Some basic results of machine arithmetic are derived as a demonstration of VPC.
[ { "created": "Tue, 7 Jan 2014 07:07:49 GMT", "version": "v1" } ]
2014-01-08
[ [ "Pantelis", "Garry", "" ] ]
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1401.1292
Jie-Jun Tseng
Chih-Hao Lin, Chia-Seng Chang and Sai-Ping Li
An Empirical Method to Measure Stochasticity and Multifractality in Nonlinear Time Series
10 pages, 11 figures
Phys. Rev. E88(2013) 062912
10.1103/PhysRevE.88.062912
null
q-fin.ST physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
An empirical algorithm is used here to study the stochastic and multifractal nature of nonlinear time series. A parameter can be defined to quantitatively measure the deviation of the time series from a Wiener process so that the stochasticity of different time series can be compared. The local volatility of the time series under study can be constructed using this algorithm and the multifractal structure of the time series can be analyzed by using this local volatility. As an example, we employ this method to analyze financial time series from different stock markets. The result shows that while developed markets evolve very much like an Ito process, the emergent markets are far from efficient. Differences about the multifractal structures and leverage effects between developed and emergent markets are discussed. The algorithm used here can be applied in a similar fashion to study time series of other complex systems.
[ { "created": "Tue, 7 Jan 2014 07:26:36 GMT", "version": "v1" } ]
2014-01-08
[ [ "Lin", "Chih-Hao", "" ], [ "Chang", "Chia-Seng", "" ], [ "Li", "Sai-Ping", "" ] ]
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1401.1294
Hossein Shokri Ghadikolaei
Hossein Shokri-Ghadikolaei and Carlo Fischione
Analysis and Optimization of Random Sensing Order in Cognitive Radio Networks
16 pages, 12 figures, 7 tables, accepted in Journal of Selected Areas in Communications (J-SAC) CR series and will be published in Apr'15
null
null
null
cs.IT cs.PF math.IT math.PR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Developing an efficient spectrum access policy enables cognitive radios to dramatically increase spectrum utilization while ensuring predetermined quality of service levels for primary users. In this paper, modeling, performance analysis, and optimization of a distributed secondary network with random sensing order policy are studied. Specifically, the secondary users create a random order of available channels upon primary users return, and then find optimal transmission and handoff opportunities in a distributed manner. By a Markov chain analysis, the average throughputs of the secondary users and average interference level among the secondary and primary users are investigated. A maximization of the secondary network performance in terms of the throughput while keeping under control the average interference is proposed. It is shown that despite of traditional view, non-zero false alarm in the channel sensing can increase channel utilization, especially in a dense secondary network where the contention is too high. Then, two simple and practical adaptive algorithms are established to optimize the network. The second algorithm follows the variations of the wireless channels in non-stationary conditions and outperforms even static brute force optimization, while demanding few computations. The convergence of the distributed algorithms are theoretically investigated based on the analytical performance indicators established by the Markov chain analysis. Finally, numerical results validate the analytical derivations and demonstrate the efficiency of the proposed schemes. It is concluded that fully distributed sensing order algorithms can lead to substantial performance improvements in cognitive radio networks without the need of centralized management or message passing among the users.
[ { "created": "Tue, 7 Jan 2014 07:32:51 GMT", "version": "v1" }, { "created": "Sun, 18 May 2014 21:28:10 GMT", "version": "v2" }, { "created": "Wed, 3 Sep 2014 07:08:27 GMT", "version": "v3" } ]
2014-09-04
[ [ "Shokri-Ghadikolaei", "Hossein", "" ], [ "Fischione", "Carlo", "" ] ]
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1401.1299
Lei Gao
Lei Gao, Tao Zhu, and Jing Zeng
Wavelength Spacing Tunable, Multiwavelength Q-Switched Mode-Locked Laser Based on Graphene-Oxide-Deposited Tapered Fiber
5 pages, 7 figures
null
null
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A wavelength spacing tunable, multiwavelength Q-switched mode-locked (QML) fiber laser in an erbium-doped fiber cavity based on graphene oxide deposited on tapered fiber is proposed by choosing the diameter and length of the taper, graphene oxide thickness and cavity dispersion, in which the wavelength spacing could be tuned by pump power. The evolutions of temporal and spectral with different pump strengths are investigated. Results show that the tunability of the multiwavelength laser can be interpreted by the bound states of QML laser resulting from a mutual interaction of dispersion, nonlinear effect, insertion loss, and pump power. To the best of our knowledge, it is the first experimental observation of bound states of QML, which provides a new mechanism to fabricate tunable multiwavelength laser.
[ { "created": "Tue, 7 Jan 2014 07:56:32 GMT", "version": "v1" } ]
2014-01-08
[ [ "Gao", "Lei", "" ], [ "Zhu", "Tao", "" ], [ "Zeng", "Jing", "" ] ]
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1401.1302
Saravanan Thirumuruanathan
Senjuti Basu Roy, Ioanna Lykourentzou, Saravanan Thirumuruganathan, Sihem Amer-Yahia, Gautam Das
Optimization in Knowledge-Intensive Crowdsourcing
12 pages
null
null
null
cs.DB cs.SI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present SmartCrowd, a framework for optimizing collaborative knowledge-intensive crowdsourcing. SmartCrowd distinguishes itself by accounting for human factors in the process of assigning tasks to workers. Human factors designate workers' expertise in different skills, their expected minimum wage, and their availability. In SmartCrowd, we formulate task assignment as an optimization problem, and rely on pre-indexing workers and maintaining the indexes adaptively, in such a way that the task assignment process gets optimized both qualitatively, and computation time-wise. We present rigorous theoretical analyses of the optimization problem and propose optimal and approximation algorithms. We finally perform extensive performance and quality experiments using real and synthetic data to demonstrate that adaptive indexing in SmartCrowd is necessary to achieve efficient high quality task assignment.
[ { "created": "Tue, 7 Jan 2014 08:02:45 GMT", "version": "v1" } ]
2014-01-08
[ [ "Roy", "Senjuti Basu", "" ], [ "Lykourentzou", "Ioanna", "" ], [ "Thirumuruganathan", "Saravanan", "" ], [ "Amer-Yahia", "Sihem", "" ], [ "Das", "Gautam", "" ] ]
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1401.1305
J. C. J. Koelemeij
N. Sotiropoulos, C. M. Okonkwo, R. Nuijts, H. de Waardt, and J. C. J. Koelemeij
Delivering 10 Gb/s optical data with picosecond timing uncertainty over 75 km distance
This paper was published in Opt.Express and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org/oe/abstract.cfm?uri=oe-21-26-32643 Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law
Opt. Express 21, 32643-32654 (2013)
10.1364/OE.21.032643
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We report a method to determine propagation delays of optical 10 Gb/s data traveling through a 75 km long amplified fiber link with an uncertainty of 4 ps. The one-way propagation delay is determined by two-way exchange and cross correlation of short (< 1 ms) bursts of 10 Gb/s data, with a single-shot time resolution better than 2.5 ps. We thus achieve a novel optical communications link suited for both long-haul high-capacity data transfer and time transfer with picosecond-range uncertainty. This opens up the perspective of synchronized optical telecommunication networks allowing picosecond-range time distribution and millimeter-range positioning.
[ { "created": "Tue, 7 Jan 2014 08:22:58 GMT", "version": "v1" } ]
2014-01-08
[ [ "Sotiropoulos", "N.", "" ], [ "Okonkwo", "C. M.", "" ], [ "Nuijts", "R.", "" ], [ "de Waardt", "H.", "" ], [ "Koelemeij", "J. C. J.", "" ] ]
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1401.1306
Jeremie Bec
Jeremie Bec, Holger Homann, and Samriddhi Sankar Ray
Gravity-driven enhancement of heavy particle clustering in turbulent flow
4 pages, 4 figures
null
10.1103/PhysRevLett.112.184501
null
physics.flu-dyn cond-mat.stat-mech nlin.CD
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Heavy particles suspended in a turbulent flow settle faster than in a still fluid. This effect stems from a preferential sampling of the regions where the fluid flows downward and is quantified here as a function of the level of turbulence, of particle inertia, and of the ratio between gravity and turbulent accelerations. By using analytical methods and detailed, state-of-the-art numerical simulations, settling is shown to induce an effective horizontal two-dimensional dynamics that increases clustering and reduce relative velocities between particles. These two competing effects can either increase or decrease the geometrical collision rates between same-size particles and are crucial for realistic modeling of coalescing particles.
[ { "created": "Tue, 7 Jan 2014 08:25:57 GMT", "version": "v1" } ]
2015-06-18
[ [ "Bec", "Jeremie", "" ], [ "Homann", "Holger", "" ], [ "Ray", "Samriddhi Sankar", "" ] ]
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1401.1307
Jiping Xiong
Jiping Xiong, Qinghua Tang, and Jian Zhao
1-bit Compressive Data Gathering for Wireless Sensor Networks
null
null
null
null
cs.NI
http://creativecommons.org/licenses/by/3.0/
Compressive sensing (CS) has been widely used for the data gathering in wireless sensor networks for the purpose of reducing the communication overhead recent years. In this paper, we first show that with simple modification, 1-bit compressive sensing can also been used for the data gathering in wireless sensor networks to further reduce the communication overhead. We also propose a novel blind 1-bit CS reconstruction algorithm which outperforms other state of the art blind 1-bit CS reconstruction algorithms. Experimental results on real sensor datasets demonstrate the efficiency of our method.
[ { "created": "Tue, 7 Jan 2014 08:32:15 GMT", "version": "v1" } ]
2014-01-08
[ [ "Xiong", "Jiping", "" ], [ "Tang", "Qinghua", "" ], [ "Zhao", "Jian", "" ] ]
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1401.1308
Tobias Kretz
Tobias Kretz, Karsten Lehmann, Ingmar Hofs\"a{\ss}, Axel Leonhardt
Dynamic Assignment in Microsimulations of Pedestrians
Contribution to 93rd Annual Meeting of the Transportation Research Board (TRB) 2014. Contribution no. 14-0941
in Annual Meeting of the Transportation Research Board, 14-0941 (2014)
null
null
cs.CE cs.MA physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A generic method for dynamic assignment used with microsimulation of pedestrian dynamics is introduced. As pedestrians - unlike vehicles - do not move on a network, but on areas they in principle can choose among an infinite number of routes. To apply assignment algorithms one has to select for each OD pair a finite (realistically a small) number of relevant representatives from these routes. This geometric task is the main focus of this contribution. The main task is to find for an OD pair the relevant routes to be used with common assignment methods. The method is demonstrated for one single OD pair and exemplified with an example.
[ { "created": "Tue, 7 Jan 2014 08:32:54 GMT", "version": "v1" } ]
2014-02-10
[ [ "Kretz", "Tobias", "" ], [ "Lehmann", "Karsten", "" ], [ "Hofsäß", "Ingmar", "" ], [ "Leonhardt", "Axel", "" ] ]
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1401.1309
Meng Xiao
Meng Xiao, Z. Q. Zhang, and C. T. Chan
Surface Impedance and Bulk Band Geometric Phases in One-Dimensional Systems
null
null
10.1103/PhysRevX.4.021017
null
cond-mat.mes-hall physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Surface impedance is an important concept in classical wave systems such as photonic crystals (PCs). For example, the condition of an interface state formation in the interfacial region of two different one-dimensional PCs is simply Z_SL +Z_SR=0, where Z_SL (Z_SR)is the surface impedance of the semi-infinite PC on the left- (right-) hand side of the interface. Here, we also show a rigorous relation between the surface impedance of a one-dimensional PC and its bulk properties through the geometrical (Zak) phases of the bulk bands, which can be used to determine the existence or non-existence of interface states at the interface of the two PCs in a particular band gap. Our results hold for any PCs with inversion symmetry, independent of the frequency of the gap and the symmetry point where the gap lies in the Brillouin Zone. Our results provide new insights on the relationship between surface scattering properties, the bulk band properties and the formation of interface states, which in turn can enable the design of systems with interface states in a rational manner.
[ { "created": "Tue, 7 Jan 2014 08:36:46 GMT", "version": "v1" } ]
2014-04-29
[ [ "Xiao", "Meng", "" ], [ "Zhang", "Z. Q.", "" ], [ "Chan", "C. T.", "" ] ]
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1401.1313
Sayan Mitra Sayan Mitra
Sayan Mitra
Proving Abstractions of Dynamical Systems through Numerical Simulations
null
null
null
null
cs.SY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A key question that arises in rigorous analysis of cyberphysical systems under attack involves establishing whether or not the attacked system deviates significantly from the ideal allowed behavior. This is the problem of deciding whether or not the ideal system is an abstraction of the attacked system. A quantitative variation of this question can capture how much the attacked system deviates from the ideal. Thus, algorithms for deciding abstraction relations can help measure the effect of attacks on cyberphysical systems and to develop attack detection strategies. In this paper, we present a decision procedure for proving that one nonlinear dynamical system is a quantitative abstraction of another. Directly computing the reach sets of these nonlinear systems are undecidable in general and reach set over-approximations do not give a direct way for proving abstraction. Our procedure uses (possibly inaccurate) numerical simulations and a model annotation to compute tight approximations of the observable behaviors of the system and then uses these approximations to decide on abstraction. We show that the procedure is sound and that it is guaranteed to terminate under reasonable robustness assumptions.
[ { "created": "Tue, 7 Jan 2014 08:59:05 GMT", "version": "v1" } ]
2014-01-08
[ [ "Mitra", "Sayan", "" ] ]
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1401.1318
Chandra Sekhar Mr
Vorugunti Chandra Sekhar and Mrudula Sarvabhatla
A Robust Biometric-Based Three-factor Remote User Authentication Scheme
null
null
null
null
cs.CR
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The rapid development of Internet of Things (IoT) technology, which is an inter connection of networks through an insecure public channel i.e. Internet demands for authenticating the remote user trying to access the secure network resources. In 2013, Ankita et al. proposed an improved three factor remote user authentication scheme. In this poster we will show that Ankita et al scheme is vulnerable to known session specific temporary information attack, on successfully performing the attack, the adversary can perform all other major cryptographic attacks. As a part of our contribution, we will propose an improved scheme which is resistance to all major cryptographic attacks and overcomes the defects in Ankita et al. scheme.
[ { "created": "Tue, 7 Jan 2014 09:29:57 GMT", "version": "v1" } ]
2014-01-08
[ [ "Sekhar", "Vorugunti Chandra", "" ], [ "Sarvabhatla", "Mrudula", "" ] ]
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1401.1321
Vyacheslav Yukalov
V.I. Yukalov, E.P. Yukalova, and D. Sornette
Utility Rate Equations of Group Population Dynamics in Biological and Social Systems
Latex file, 39 pages, 8 figures
PLOS One 8, e83225 (2013)
null
null
physics.soc-ph q-bio.PE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a novel system of equations to describe the evolution of self-organized structured societies (biological or human) composed of several trait groups. The suggested approach is based on the combination of ideas employed in the theory of biological populations, system theory, and utility theory. The evolution equations are defined as utility rate equations, whose parameters are characterized by the utility of each group with respect to the society as a whole and by the mutual utilities of groups with respect to each other. We analyze in detail the cases of two groups (cooperators and defectors) and of three groups (cooperators, defectors, and regulators) and find that, in a self-organized society, neither defectors nor regulators can overpass the maximal fractions of about 10% each. This is in agreement with the data for bee and ant colonies. The classification of societies by their distance from equilibrium is proposed. We apply the formalism to rank the countries according to the introduced metric quantifying their relative stability, which depends on the cost of defectors and regulators as well as their respective population fractions. We find a remarkable concordance with more standard economic ranking based, for instance, on GDP per capita.
[ { "created": "Tue, 7 Jan 2014 09:33:30 GMT", "version": "v1" } ]
2014-01-08
[ [ "Yukalov", "V. I.", "" ], [ "Yukalova", "E. P.", "" ], [ "Sornette", "D.", "" ] ]
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1401.1322
Jochen Fick
Jean-Baptiste Decombe, Jean-Fran\c{c}ois Bryche, Jean-Fran\c{c}ois Motte, Jo\"el Chevrier, Serge Huant, and Jochen Fick
Transmission and reflection characteristics of metal-coated optical fiber tip pairs
null
Appl. Opt., Vol. 52, page 6620-6624, 2013
10.1364/AO.52.006620
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The optical transmission and reflection in between two metalized optical fiber tips is studied in the optical near-field and far-field domains. Besides aluminum-coated tips for near-field scanning optical microscopy (NSOM), specifically developed gold-coated fiber tips cut by focused ion beam (FIB) are investigated. Transverse transmission maps of sub-wavelength width clearly evidence optical near-field coupling between the tips for short tip distances and becomes essentially Gaussian-shaped for larger distances in the far-field regime. Moreover concentric reflection fringes observed for NSOM-type tips illustrate the influence of the receiving fiber tip on the emission pattern of the source tip.
[ { "created": "Tue, 7 Jan 2014 09:36:57 GMT", "version": "v1" } ]
2014-01-08
[ [ "Decombe", "Jean-Baptiste", "" ], [ "Bryche", "Jean-François", "" ], [ "Motte", "Jean-François", "" ], [ "Chevrier", "Joël", "" ], [ "Huant", "Serge", "" ], [ "Fick", "Jochen", "" ] ]
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1401.1326
J\"urgen M\"unch
Michael Kl\"as, Frank Elberzhager, J\"urgen M\"unch, Klaus Hartjes, Olaf von Graevemeyer
Transparent Combination of Expert and Measurement Data for Defect Prediction: An Industrial Case Study
10 pages. The final publication is available at http://ieeexplore.ieee.org/xpl/articleDetails.jsp?tp=&arnumber=6062145
Proceedings of the 32nd ACM/IEEE International Conference on Software Engineering (ICSE '10), pages 119-128, New York, NY, USA, 2010
10.1145/1810295.1810313
null
cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Defining strategies on how to perform quality assurance (QA) and how to control such activities is a challenging task for organizations developing or maintaining software and software-intensive systems. Planning and adjusting QA activities could benefit from accurate estimations of the expected defect content of relevant artifacts and the effectiveness of important quality assurance activities. Combining expert opinion with commonly available measurement data in a hybrid way promises to overcome the weaknesses of purely data-driven or purely expert-based estimation methods. This article presents a case study of the hybrid estimation method HyDEEP for estimating defect content and QA effectiveness in the telecommunication domain. The specific focus of this case study is the use of the method for gaining quantitative predictions. This aspect has not been empirically analyzed in previous work. Among other things, the results show that for defect content estimation, the method performs significantly better statistically than purely data-based methods, with a relative error of 0.3 on average (MMRE).
[ { "created": "Tue, 7 Jan 2014 09:56:17 GMT", "version": "v1" } ]
2014-01-08
[ [ "Kläs", "Michael", "" ], [ "Elberzhager", "Frank", "" ], [ "Münch", "Jürgen", "" ], [ "Hartjes", "Klaus", "" ], [ "von Graevemeyer", "Olaf", "" ] ]
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1401.1327
Costas Papachristou
C. J. Papachristou
The hidden symmetry and Mr. Higgs!
6 pages; added appendix & reference
null
null
null
physics.pop-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Written in non-technical language, this review article explains the significance of the Higgs field and the associated Higgs boson in High-Energy Physics. The connection of symmetry with particle interactions and their unification is also discussed in this context. The presentation is informal and physical concepts are demonstrated through metaphors from everyday experience.
[ { "created": "Tue, 7 Jan 2014 09:58:17 GMT", "version": "v1" }, { "created": "Wed, 29 Jan 2014 11:46:04 GMT", "version": "v2" } ]
2014-01-30
[ [ "Papachristou", "C. J.", "" ] ]
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1401.1330
Sascha Kurz
Sascha Kurz and Nikolas Tautenhahn
Classes of Complete Simple Games that are All Weighted
14 pages, to be presented and published at ICORES 2014: http://www.icores.org/
null
null
null
math.CO cs.GT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Important decisions are likely made by groups of agents. Thus group decision making is very common in practice. Very transparent group aggregating rules are given by weighted voting, where each agent is assigned a weight. Here a proposal is accepted if the sum of the weights of the supporting agents meets or exceeds a given quota. We study a more general class of binary voting systems -- complete simple games -- and propose an algorithm to determine which sub classes, parameterized by the agent's type composition, are weighted.
[ { "created": "Tue, 7 Jan 2014 10:11:53 GMT", "version": "v1" } ]
2014-01-08
[ [ "Kurz", "Sascha", "" ], [ "Tautenhahn", "Nikolas", "" ] ]
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1401.1331
Igor Shparlinski
Oscar Garcia-Morchon, Ronald Rietman, Igor E. Shparlinski and Ludo Tolhuizen
Interpolation and Approximation of Polynomials in Finite Fields over a Short Interval from Noisy Values
null
null
null
null
math.NT cs.CR cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Motivated by a recently introduced HIMMO key distribution scheme, we consider a modification of the noisy polynomial interpolation problem of recovering an unknown polynomial $f(X) \in Z[X]$ from approximate values of the residues of $f(t)$ modulo a prime $p$ at polynomially many points $t$ taken from a short interval.
[ { "created": "Tue, 7 Jan 2014 10:13:42 GMT", "version": "v1" } ]
2014-01-08
[ [ "Garcia-Morchon", "Oscar", "" ], [ "Rietman", "Ronald", "" ], [ "Shparlinski", "Igor E.", "" ], [ "Tolhuizen", "Ludo", "" ] ]
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1401.1333
Bogdan Oancea
Bogdan Oancea and \c{S}Tefan Cristian Ciucu
Time series forecasting using neural networks
Proceedings of the CKS 2013 International Conference
Proceedings of the CKS 2013 International Conference
null
null
cs.NE
http://creativecommons.org/licenses/by/3.0/
Recent studies have shown the classification and prediction power of the Neural Networks. It has been demonstrated that a NN can approximate any continuous function. Neural networks have been successfully used for forecasting of financial data series. The classical methods used for time series prediction like Box-Jenkins or ARIMA assumes that there is a linear relationship between inputs and outputs. Neural Networks have the advantage that can approximate nonlinear functions. In this paper we compared the performances of different feed forward and recurrent neural networks and training algorithms for predicting the exchange rate EUR/RON and USD/RON. We used data series with daily exchange rates starting from 2005 until 2013.
[ { "created": "Tue, 7 Jan 2014 10:29:24 GMT", "version": "v1" } ]
2018-02-09
[ [ "Oancea", "Bogdan", "" ], [ "Ciucu", "ŞTefan Cristian", "" ] ]
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1401.1346
Shengyao Chen
Feng Xi, Shengyao Chen, and Zhong Liu
Quadrature Compressive Sampling for Radar Signals
16 pages, 15 figures submitted to IEEE Trans on Signal Processing
null
10.1109/TSP.2014.2315168
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Quadrature sampling has been widely applied in coherent radar systems to extract in-phase and quadrature (I and Q) components in the received radar signal. However, the sampling is inefficient because the received signal contains only a small number of significant target signals. This paper incorporates the compressive sampling (CS) theory into the design of the quadrature sampling system, and develops a quadrature compressive sampling (QuadCS) system to acquire the I and Q components with low sampling rate. The QuadCS system first randomly projects the received signal into a compressive bandpass signal and then utilizes the quadrature sampling to output compressive I and Q components. The compressive outputs are used to reconstruct the I and Q components. To understand the system performance, we establish the frequency domain representation of the QuadCS system. With the waveform-matched dictionary, we prove that the QuadCS system satisfies the restricted isometry property with overwhelming probability. For K target signals in the observation interval T, simulations show that the QuadCS requires just O(Klog(BT/K)) samples to stably reconstruct the signal, where B is the signal bandwidth. The reconstructed signal-to-noise ratio decreases by 3dB for every octave increase in the target number K and increases by 3dB for every octave increase in the compressive bandwidth. Theoretical analyses and simulations verify that the proposed QuadCS is a valid system to acquire the I and Q components in the received radar signals.
[ { "created": "Tue, 7 Jan 2014 11:44:01 GMT", "version": "v1" } ]
2015-06-18
[ [ "Xi", "Feng", "" ], [ "Chen", "Shengyao", "" ], [ "Liu", "Zhong", "" ] ]
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1401.1347
Matthias W\"ahlisch
Cristian Chilipirea, Andreea-Cristina Petre, Ciprian Dobre
MANIAC Challenge: The Wolf-pack strategy
Published in: E. Baccelli, F. Juraschek, O. Hahm, T. C. Schmidt, H. Will, M. W\"ahlisch (Eds.), Proc. of 3rd MANIAC Challenge, Berlin, Germany, July 27 - 28, 2013, arXiv:1401.1163, Jan. 2014
null
null
MANIAC/2013/03
cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
MANIAC Challenge raises a problem of game theory, different players strategies intertwine and the success of any player is dependent on the actions of all players in the system. A truly fair scenario is when all the strategies are identical, all the nodes co-operate and they all equally share the rewards and risks that come with every transfer. A successful strategy is one that tries to diverge from the equilibrium to maximize its own gains and it manages to do so. We propose the wolf-pack strategy. Unlike standard game-theory based strategies, our strategy does not penalize the nodes that diverge from fairness or from equilibrium, as we believe most nodes will do so in an attempt to get an advantage over the other nodes. The wolf-pack strategy will try to always find the most successful node or nodes and penalize them. We believe that just like in nature, a number of small predators can take down the bigger, more profitable ones. Furthermore during the Challenge we test two different strategies that provide completely opposite results. These offer a clear picture of what the best strategy is and the problems of the current system.
[ { "created": "Tue, 7 Jan 2014 11:44:45 GMT", "version": "v1" } ]
2014-01-08
[ [ "Chilipirea", "Cristian", "" ], [ "Petre", "Andreea-Cristina", "" ], [ "Dobre", "Ciprian", "" ] ]
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1401.1349
Matthias W\"ahlisch
Isaac Supeene, Asanga Udugama, Ren\'e Steinr\"ucken
Selfishness as a Virtue in Mobile Ad Hoc Networks
Published in: E. Baccelli, F. Juraschek, O. Hahm, T. C. Schmidt, H. Will, M. W\"ahlisch (Eds.), Proc. of 3rd MANIAC Challenge, Berlin, Germany, July 27 - 28, 2013, arXiv:1401.1163, Jan. 2014
null
null
MANIAC/2013/05
cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Using Mobile Ad Hoc Networks as a way to break the dependency of mobile communications on permanent infrastructure has been an active area of research for several years, but only more recently has consideration been given to the economics of a distributed mobile service. In particular, the topic of handling nodes that act selfishly or maliciously has not yet been explored in detail. In this paper, we discuss the SAVMAN strategy for mobile offloading under the rules of the 2013 MANIAC Challenge.
[ { "created": "Tue, 7 Jan 2014 11:50:44 GMT", "version": "v1" } ]
2014-01-08
[ [ "Supeene", "Isaac", "" ], [ "Udugama", "Asanga", "" ], [ "Steinrücken", "René", "" ] ]
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1401.1373
Jerome Petri
J. P\'etri
A spectral method in space and time to solve the advection-diffusion and wave equations in a bounded domain
26 pages, 8 figures, 3 tables
null
null
null
physics.comp-ph math.NA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The advection-diffusion and wave equations are the fundamental equations governing any physical law and therefore arise in many areas of physics and astrophysics. For complex problems and geometries, only numerical simulations can give insight into quantitative and accurate behavior of the seeked solutions. The standard numerical algorithm to solve partial differential equations is to split the space and time discretisation separately into different uncorrelated methods. Time is usually advanced by explicit schemes, or, for too restrictive time steps, by implicit or semi-implicit algorithms. This separate time and space slicing is artificial and sometimes unpractical. Indeed, treating space and time directions symmetrically and simultaneously without splitting is highly recommended in some problems like diffusion. It is the purpose of this work to present a simple numerical algorithm to solve the standard linear scalar advection-diffusion and wave equations using a fully spectral method in a two-dimensional Cartesian $(x,t)$ bounded space-time domain. Generalization in three-dimensions $(x,y,t)$ is shown for the pure diffusion problem. The basic idea is to expand the unknown function in Chebyshev polynomials for the spatial variables $(x,y)$ as well as for the time variable $t$. We show typical examples and demonstrate the spectral accuracy of the method. The great advantage of fully spectral methods resides in their high-accuracy for a relatively small number of grid points (for sufficiently smooth solutions) compared to standard time-stepping techniques.
[ { "created": "Tue, 7 Jan 2014 13:44:15 GMT", "version": "v1" } ]
2014-01-08
[ [ "Pétri", "J.", "" ] ]
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1401.1376
Thomas Buchmann
Thomas Buchmann, Johannes Baumgartl, Dominik Henrich and Bernhard Westfechtel
Towards A Domain-specific Language For Pick-And-Place Applications
Presented at DSLRob 2013 (arXiv:1312.5952)
null
null
DSLRob/2013/04
cs.RO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Programming robots is a complicated and time-consuming task. A robot is essentially a real-time, distributed embedded system. Often, control and communication paths within the system are tightly coupled to the actual physical configuration of the robot. Thus, programming a robot is a very challenging task for domain experts who do not have a dedicated background in robotics. In this paper we present an approach towards a domain specific language, which is intended to reduce the efforts and the complexity which is required when developing robotic applications. Furthermore we apply a software product line approach to realize a configurable code generator which produces C++ code which can either be run on real robots or on a robot simulator.
[ { "created": "Tue, 7 Jan 2014 13:44:52 GMT", "version": "v1" } ]
2014-01-08
[ [ "Buchmann", "Thomas", "" ], [ "Baumgartl", "Johannes", "" ], [ "Henrich", "Dominik", "" ], [ "Westfechtel", "Bernhard", "" ] ]
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