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1401.4944
Thibault Deleu
Thibault Deleu, Mathieu Dervin, Kenta Kasai, Fran\c{c}ois Horlin
Iterative pre-distortion of the non-linear satellite channel
null
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Digital Video Broadcasting - Satellite - Second Generation (DVB-S2) is the current European standard for satellite broadcast and broadband communications. It relies on high order modulations up to 32-amplitude/phase-shift-keying (APSK) in order to increase the system spectral efficiency. Unfortunately, as the modulation order increases, the receiver becomes more sensitive to physical layer impairments, and notably to the distortions induced by the power amplifier and the channelizing filters aboard the satellite. Pre-distortion of the non-linear satellite channel has been studied for many years. However, the performance of existing pre-distortion algorithms generally becomes poor when high-order modulations are used on a non-linear channel with a long memory. In this paper, we investigate a new iterative method that pre-distorts blocks of transmitted symbols so as to minimize the Euclidian distance between the transmitted and received symbols. We also propose approximations to relax the pre-distorter complexity while keeping its performance acceptable.
[ { "created": "Mon, 20 Jan 2014 15:35:45 GMT", "version": "v1" }, { "created": "Tue, 13 May 2014 12:12:34 GMT", "version": "v2" } ]
2014-05-14
[ [ "Deleu", "Thibault", "" ], [ "Dervin", "Mathieu", "" ], [ "Kasai", "Kenta", "" ], [ "Horlin", "François", "" ] ]
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1401.4945
Andrea Marini
Samudra Roy, Andrea Marini and Fabio Biancalana
Free-carrier driven spatio-temporal dynamics in amplifying silicon waveguides
5 pages, 4 figures
Phys. Rev. A 89, 053827 (2014)
10.1103/PhysRevA.89.053827
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We theoretically investigate the free-carrier induced spatio-temporal dynamics of continuous waves in silicon waveguides embedded in an amplifying medium. Optical propagation is governed by a cubic Ginzburg-Landau equation coupled with an ordinary differential equation accounting for the free-carrier dynamics. We find that, owing to free-carrier dispersion, countinuous waves are modulationally unstable in both anomalous and normal dispersion regimes and chaotically generate unstable accelerating pulses.
[ { "created": "Mon, 20 Jan 2014 15:36:54 GMT", "version": "v1" } ]
2014-05-28
[ [ "Roy", "Samudra", "" ], [ "Marini", "Andrea", "" ], [ "Biancalana", "Fabio", "" ] ]
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1401.4947
Gian Piero Puccioni
G.P. Puccioni and G.L. Lippi
Fast dynamics and spectral properties of a multilongitudinal-mode semiconductor laser: evolution of an ensemble of driven, globally coupled nonlinear modes
14 pages, 14 figures in color
null
null
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We analyze the fast transient dynamics of a multi-longitudinal mode semiconductor laser on the basis of a model with intensity coupling. The dynamics, coupled to the constraints of the system and the below-threshold initial conditions, imposes a faster growth of the side modes in the initial stages of the transient, thereby leading the laser through a sequence of states where the modal intensity distribution dramatically differs from the asymptotic one. A detailed analysis of the below-threshold, deterministic dynamical evolution allows us to explain the modal dynamics in the strongly coupled regime where the total intensity peak and relaxation oscillations take place, thus providing an explanation for the modal dynamics observed in the slow, hidden evolution towards the asymptotic state (cf. Phys. Rev. A 85, 043823 (2012)). The dynamics of this system can be interpreted as the transient response of a driven, globally coupled ensemble of nonlinear modes evolving towards an equilibrium state. Since the qualitative dynamics do not depend on the details of the interaction but only on the structure of the coupling, our results hold for a whole class of globally, bilinearly coupled oscillators.
[ { "created": "Mon, 20 Jan 2014 15:40:47 GMT", "version": "v1" } ]
2014-01-21
[ [ "Puccioni", "G. P.", "" ], [ "Lippi", "G. L.", "" ] ]
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1401.4950
Matthias Petschow
Matthias Petschow (1), ((1) AICES, RWTH Aachen)
MRRR-based Eigensolvers for Multi-core Processors and Supercomputers
PhD thesis
null
null
null
cs.MS cs.NA cs.PF math.NA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The real symmetric tridiagonal eigenproblem is of outstanding importance in numerical computations; it arises frequently as part of eigensolvers for standard and generalized dense Hermitian eigenproblems that are based on a reduction to tridiagonal form. For its solution, the algorithm of Multiple Relatively Robust Representations (MRRR or MR3 in short) - introduced in the late 1990s - is among the fastest methods. To compute k eigenpairs of a real n-by-n tridiagonal T, MRRR only requires O(kn) arithmetic operations; in contrast, all the other practical methods require O(k^2 n) or O(n^3) operations in the worst case. This thesis centers around the performance and accuracy of MRRR.
[ { "created": "Mon, 20 Jan 2014 15:52:03 GMT", "version": "v1" } ]
2014-01-21
[ [ "Petschow", "Matthias", "", "AICES, RWTH Aachen" ] ]
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1401.4953
Han Jingjun
Jingjun Han, Liyun Dai, Bican Xia
Constructing Fewer Open Cells by GCD Computation in CAD Projection
Accepted by ISSAC 2014 (July 23--25, 2014, Kobe, Japan)
null
10.1145/2608628.2608676
null
cs.SC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A new projection operator based on cylindrical algebraic decomposition (CAD) is proposed. The new operator computes the intersection of projection factor sets produced by different CAD projection orders. In other words, it computes the gcd of projection polynomials in the same variables produced by different CAD projection orders. We prove that the new operator still guarantees obtaining at least one sample point from every connected component of the highest dimension, and therefore, can be used for testing semi-definiteness of polynomials. Although the complexity of the new method is still doubly exponential, in many cases, the new operator does produce smaller projection factor sets and fewer open cells. Some examples of testing semi-definiteness of polynomials, which are difficult to be solved by existing tools, have been worked out efficiently by our program based on the new method.
[ { "created": "Mon, 20 Jan 2014 15:55:33 GMT", "version": "v1" }, { "created": "Sat, 17 May 2014 15:20:27 GMT", "version": "v2" } ]
2014-05-20
[ [ "Han", "Jingjun", "" ], [ "Dai", "Liyun", "" ], [ "Xia", "Bican", "" ] ]
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1401.4963
Dr. Georgios M. Nikolopoulos
G M Nikolopoulos and P Lambropoulos
Frequency response of an atomic resonance driven by weak free-electron-laser fluctuating pulses
arXiv admin note: substantial text overlap with arXiv:1209.2231
J. Phys. B: At. Mol. Opt. Phys. 46, 164010 (2013)
10.1088/0953-4075/46/16/164010
null
quant-ph physics.atom-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Motivated by recent experiments pertaining to the interaction of weak SASE-FEL pulses with atoms and molecules, we investigate the conditions under which such interactions can be described in the framework of a simple phase-diffusion model with decorrelated atom-field dynamics. The nature of the fluctuations that are inevitably present in SASE-FEL pulses is shown to play a pivotal role in the success of the decorrelation. Our analysis is performed in connection with specific recent experimental results from FLASH in the soft X-ray regime.
[ { "created": "Mon, 20 Jan 2014 16:13:50 GMT", "version": "v1" } ]
2014-01-21
[ [ "Nikolopoulos", "G M", "" ], [ "Lambropoulos", "P", "" ] ]
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1401.4965
Marc Hellmuth
Marc Hellmuth and Tilen Marc
On the Cartesian Skeleton and the Factorization of the Strong Product of Digraphs
null
null
10.1016/j.tcs.2014.10.045
null
cs.DM math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The three standard products (the Cartesian, the direct and the strong product) of undirected graphs have been wellinvestigated, unique prime factor decomposition (PFD) are known and polynomial time algorithms have been established for determining the prime factors. For directed graphs, unique PFD results with respect to the standard products are known. However, there is still a lack of algorithms, that computes the PFD of directed graphs with respect to the direct and the strong product in general. In this contribution, we focus on the algorithmic aspects for determining the PFD of directed graphs with respect to the strong product. Essential for computing the prime factors is the construction of a so-called Cartesian skeleton. This article introduces the notion of the Cartesian skeleton of directed graphs as a generalization of the Cartesian skeleton of undirected graphs. We provide new, fast and transparent algorithms for its construction. Moreover, we present a first polynomial time algorithm for determining the PFD with respect to the strong product of arbitrary connected digraphs.
[ { "created": "Mon, 20 Jan 2014 16:16:13 GMT", "version": "v1" } ]
2014-11-11
[ [ "Hellmuth", "Marc", "" ], [ "Marc", "Tilen", "" ] ]
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1401.4970
Gregory Bewley
Eberhard Bodenschatz, Gregory P. Bewley, Holger Nobach, Michael Sinhuber and Haitao Xu
Variable Density Turbulence Tunnel Facility
45 pages, 31 figures
null
10.1063/1.4896138
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The Variable Density Turbulence Tunnel (VDTT) at the Max Planck Institute for Dynamics and Self-Organization in G\"ottingen, Germany produces very high turbulence levels at moderate flow velocities, low power consumption and adjustable kinematic viscosity between $10^{-4} m^2/s$ and $10^{-7} m^2/s$. The Reynolds number can be varied by changing the pressure or flow rate of the gas or by using different non-flammable gases including air. The highest kinematic viscosities, and hence lowest Reynolds numbers, are reached with air or nitrogen at 0.1 bar. To reach the highest Reynolds numbers the tunnel is pressurized to 15 bar with the dense gas sulfur hexafluoride (SF$_6$). Turbulence is generated at the upstream ends of two measurement sections with grids, and the evolution of this turbulence is observed as it moves down the length of the sections. We describe the instrumentation presently in operation, which consists of the tunnel itself, classical grid turbulence generators, and state-of-the-art nano-fabricated hot-wire anemometers provided by Princeton University [Vallikivi et al. (2011) Exp. Fluids 51, 1521]. We report measurements of the characteristic scales of the flow and of turbulent spectra up to Taylor Reynolds number $R_\lambda \approx 1600$, higher than any other grid-turbulence experiment. We also describe instrumentation under development, which includes an active grid and a Lagrangian particle tracking system that moves down the length of the tunnel with the mean flow. In this configuration, the properties of the turbulence are adjustable and its structure is resolvable up to $R_\lambda \approx 8000$.
[ { "created": "Mon, 20 Jan 2014 16:30:57 GMT", "version": "v1" }, { "created": "Thu, 23 Jan 2014 16:10:14 GMT", "version": "v2" }, { "created": "Thu, 3 Jul 2014 20:54:57 GMT", "version": "v3" } ]
2015-06-18
[ [ "Bodenschatz", "Eberhard", "" ], [ "Bewley", "Gregory P.", "" ], [ "Nobach", "Holger", "" ], [ "Sinhuber", "Michael", "" ], [ "Xu", "Haitao", "" ] ]
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1401.4972
Lelia Blin
L\'elia Blin and S\'ebastien Tixeuil
Compact Deterministic Self-Stabilizing Leader Election: The Exponential Advantage of Being Talkative
null
null
null
null
cs.DC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper focuses on compact deterministic self-stabilizing solutions for the leader election problem. When the protocol is required to be \emph{silent} (i.e., when communication content remains fixed from some point in time during any execution), there exists a lower bound of Omega(\log n) bits of memory per node participating to the leader election (where n denotes the number of nodes in the system). This lower bound holds even in rings. We present a new deterministic (non-silent) self-stabilizing protocol for n-node rings that uses only O(\log\log n) memory bits per node, and stabilizes in O(n\log^2 n) rounds. Our protocol has several attractive features that make it suitable for practical purposes. First, the communication model fits with the model used by existing compilers for real networks. Second, the size of the ring (or any upper bound on this size) needs not to be known by any node. Third, the node identifiers can be of various sizes. Finally, no synchrony assumption, besides a weakly fair scheduler, is assumed. Therefore, our result shows that, perhaps surprisingly, trading silence for exponential improvement in term of memory space does not come at a high cost regarding stabilization time or minimal assumptions.
[ { "created": "Mon, 20 Jan 2014 16:34:46 GMT", "version": "v1" } ]
2014-01-21
[ [ "Blin", "Lélia", "" ], [ "Tixeuil", "Sébastien", "" ] ]
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1401.4973
Samson Abramsky
Samson Abramsky
What are the fundamental structures of concurrency? We still don't know!
5 pages
Electronic Notes in Theoretical Computer Science 162 (2006): 37-41
null
null
cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Process algebra has been successful in many ways; but we don't yet see the lineaments of a fundamental theory. Some fleeting glimpses are sought from Petri Nets, physics and geometry.
[ { "created": "Mon, 20 Jan 2014 16:35:23 GMT", "version": "v1" } ]
2014-01-21
[ [ "Abramsky", "Samson", "" ] ]
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1401.4975
Dr. Georgios M. Nikolopoulos
P. Lambropoulos and G. M. Nikolopoulos
Multiple Ionization under Strong XUV to X-ray Radiation
null
Eur. Phys. J. Special Topics 222, 2067 (2013)
10.1140/epjst/e2013-01987-7
null
physics.atom-ph quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We review the main aspects of multiple photoionization processes in atoms exposed to intense, short wavelength radiation. The main focus is the theoretical framework for the description of such processes as well as the conditions under which direct multiphoton multiple ionization processes can dominate over the sequential ones. We discuss in detail the mechanisms available in different wavelength ranges from the infrared to the hard X-rays. The effect of field fluctuations, present at this stage in all SASE free-electron-laser (FEL) facilities, as well as the effect of the interaction volume integration, are also discussed.
[ { "created": "Mon, 20 Jan 2014 16:36:27 GMT", "version": "v1" } ]
2014-01-21
[ [ "Lambropoulos", "P.", "" ], [ "Nikolopoulos", "G. M.", "" ] ]
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1401.4981
Maddalena Mantovani
Benjamin Canuel, Eric Genin, Maddalena Mantovani, Julien Marque, Paolo Ruggi and Matteo Tacca
A sub nrad beam pointing monitoring and stabilization system for controlling input beam jitter in GW interferometers
null
null
10.1364/AO.53.002906
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper a simple and very effective control system to monitor and suppress the beam jitter noise at the input of an optical system, called Beam Pointing Control (BPC) system, will be described showing the theoretical principle and an experimental demonstration for the application of large scale gravitational wave interferometers, in particular for the Advanced Virgo detector. For this purpose the requirements for the control accuracy and the sensing noise will be computed by taking into account the Advanced Virgo optical configuration and the outcomes will be compared with the experimental measurement obtained in the laboratory. The system has shown unprecedented performance in terms of control accuracy and sensing noise. The BPC system has achieved a control accuracy of ~ $10^{-8}$ rad for the tilt and ~ $10^{-7}$ m for the shift and a sensing noise of less than 1 nrad/$\sqrt{Hz}$ resulting compliant with the Advance Virgo gravitational wave interferometer requirements.
[ { "created": "Mon, 20 Jan 2014 16:54:58 GMT", "version": "v1" } ]
2015-06-18
[ [ "Canuel", "Benjamin", "" ], [ "Genin", "Eric", "" ], [ "Mantovani", "Maddalena", "" ], [ "Marque", "Julien", "" ], [ "Ruggi", "Paolo", "" ], [ "Tacca", "Matteo", "" ] ]
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1401.4994
Nikolaos Mavridis
Nikolaos Mavridis
A Review of Verbal and Non-Verbal Human-Robot Interactive Communication
null
null
null
null
cs.RO cs.CL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, an overview of human-robot interactive communication is presented, covering verbal as well as non-verbal aspects of human-robot interaction. Following a historical introduction, and motivation towards fluid human-robot communication, ten desiderata are proposed, which provide an organizational axis both of recent as well as of future research on human-robot communication. Then, the ten desiderata are examined in detail, culminating to a unifying discussion, and a forward-looking conclusion.
[ { "created": "Mon, 20 Jan 2014 17:31:05 GMT", "version": "v1" } ]
2014-01-21
[ [ "Mavridis", "Nikolaos", "" ] ]
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1401.4996
Bikashkali Midya
Bikashkali Midya
Supersymmetry generated one-way invisible PT-symmetric optical crystals
Final version
Physical Review A 89, 032116 (2014)
10.1103/PhysRevA.89.032116
null
physics.optics quant-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We use supersymmetry transformations to design transparent and one-way reflectionless (thus unidirectionally invisible) complex crystals with balanced gain and loss profiles. The scattering coefficients are investigated using the transfer matrix approach. It is shown that the amount of reflection from the left can be made arbitrarily close to zero whereas the reflection from the right is enhanced arbitrarily (or vice versa).
[ { "created": "Mon, 20 Jan 2014 17:40:34 GMT", "version": "v1" }, { "created": "Wed, 22 Jan 2014 20:34:26 GMT", "version": "v2" }, { "created": "Thu, 13 Mar 2014 16:51:01 GMT", "version": "v3" } ]
2014-03-14
[ [ "Midya", "Bikashkali", "" ] ]
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1401.5004
Chithrupa Ramesh
Chithrupa Ramesh, Henrik Sandberg and Karl H. Johansson
Stability Analysis and Design of a Network of Event-based Systems
null
null
null
null
cs.SY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider a network of event-based systems that use a shared wireless medium to communicate with their respective controllers. These systems use a contention resolution mechanism to arbitrate access to the shared network. We identify sufficient conditions for Lyapunov mean square stability of each control system in the network, and design event-based policies that guarantee it. Our stability analysis is based on a Markov model that removes the network-induced correlation between the states of the control systems in the network. Analyzing the stability of this Markov model remains a challenge, as the event-triggering policy renders the estimation error non-Gaussian. Hence, we identify an auxiliary system that furnishes an upper bound for the variance of the system states. Using the stability analysis, we design policies, such as the constant-probability policy, for adapting the event-triggering thresholds to the delay in accessing the network. Realistic wireless networked control examples illustrate the applicability of the presented approach.
[ { "created": "Mon, 20 Jan 2014 18:14:19 GMT", "version": "v1" } ]
2014-01-21
[ [ "Ramesh", "Chithrupa", "" ], [ "Sandberg", "Henrik", "" ], [ "Johansson", "Karl H.", "" ] ]
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1401.5014
Lee-Ad Gottlieb
Lee-Ad Gottlieb and Shay Solomon
Light spanners for snowflake metrics
null
null
null
null
cs.CG cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A classic result in the study of spanners is the existence of light low-stretch spanners for Euclidean spaces. These spanners ahve arbitrary low stretch, and weight only a constant factor greater than that of the minimum spanning tree of the points (with dependence on the stretch and Euclidean dimention). A central open problem in this field asks whether other spaces admit low weight spanners as well - for example metric space with low intrinsic dimension - yet only a handful of results of this type are known. In this paper, we consider snowflake metric spaces of low intrinsic dimension. The {\alpha}-snowflake of a metric (X,{\delta}) is the metric (X,${\delta}^{\alpha}$) for 0<{\alpha}<1. By utilizing an approach completely different than those used for Euclidean spaces, we demonstrate that snowflake metrics admit light spanners. Further, we show that the spanner is of diameter O($\log$n), a result not possible for Euclidean spaces. As an immediate corollary to our spanner, we obtain dramatic improvments in algorithms for the traveling salesman problem in this setting, achieving a polynomial-time approximation scheme with near-linear runtime. Along the way, we show that all ${\ell}_p$ spaces admit light spanners, a result of interest in its own right.
[ { "created": "Mon, 20 Jan 2014 18:57:08 GMT", "version": "v1" } ]
2014-01-21
[ [ "Gottlieb", "Lee-Ad", "" ], [ "Solomon", "Shay", "" ] ]
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1401.5021
Andrea Apolloni
Andrea Apolloni, Chiara Poletto, Jose' J. Ramasco, Pablo Jensen, Vittoria Colizza
Metapopulation epidemic models with heterogeneous mixing and travel behaviour
null
BMC Theoretical Biology and Medical Modelling 2014, 11:3
null
null
physics.soc-ph q-bio.PE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The complex interplay between population movements in space and non-homogeneous mixing patterns have so far hindered the fundamental understanding of the conditions for spatial invasion through a general theoretical framework. To address this issue, we present an analytical modelling approach taking into account such interplay under general conditions of mobility and interactions, in the simplifying assumption of two population classes. We describe a spatially structured population with non-homogeneous mixing and travel behaviour through a multi-host stochastic epidemic metapopulation model. Different population partitions, mixing patterns and mobility structures are considered, along with a specific application for the study of the role of age partition in the early spread of the 2009 H1N1 pandemic influenza. We provide a complete mathematical formulation of the model and derive a semi-analytical expression of the threshold condition for global invasion of an emerging infectious disease in the metapopulation system. A rich solution space is found that depends on the social partition of the population, the pattern of contacts across groups and their relative social activity, the travel attitude of each class, and the topological and traffic features of the mobility network. Reducing the activity of the less social group and reducing the cross-group mixing are predicted to be the most efficient strategies for controlling the pandemic potential in the case the less active group constitutes the majority of travellers. If instead traveling is dominated by the more social class, our model predicts the existence of an optimal across-groups mixing that maximises the pandemic potential of the disease, whereas the impact of variations in the activity of each group is less important.
[ { "created": "Mon, 20 Jan 2014 19:15:16 GMT", "version": "v1" } ]
2014-01-21
[ [ "Apolloni", "Andrea", "" ], [ "Poletto", "Chiara", "" ], [ "Ramasco", "Jose' J.", "" ], [ "Jensen", "Pablo", "" ], [ "Colizza", "Vittoria", "" ] ]
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1401.5027
Qing Ke
Qing Ke and Yong-Yeol Ahn
Tie Strength Distribution in Scientific Collaboration Networks
null
Phys. Rev. E 90, 032804 (2014)
10.1103/PhysRevE.90.032804
null
physics.soc-ph cs.SI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Science is increasingly dominated by teams. Understanding patterns of scientific collaboration and their impacts on the productivity and evolution of disciplines is crucial to understand scientific processes. Electronic bibliography offers a unique opportunity to map and investigate the nature of scientific collaboration. Recent work have demonstrated a counter-intuitive organizational pattern of scientific collaboration networks: densely interconnected local clusters consist of weak ties, whereas strong ties play the role of connecting different clusters. This pattern contrasts itself from many other types of networks where strong ties form communities while weak ties connect different communities. Although there are many models for collaboration networks, no model reproduces this pattern. In this paper, we present an evolution model of collaboration networks, which reproduces many properties of real-world collaboration networks, including the organization of tie strengths, skewed degree and weight distribution, high clustering and assortative mixing.
[ { "created": "Mon, 20 Jan 2014 19:40:23 GMT", "version": "v1" }, { "created": "Wed, 22 Jan 2014 01:43:53 GMT", "version": "v2" }, { "created": "Sun, 6 Jul 2014 19:16:01 GMT", "version": "v3" } ]
2014-09-17
[ [ "Ke", "Qing", "" ], [ "Ahn", "Yong-Yeol", "" ] ]
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1401.5031
Joseph Ramsey
Joseph D. Ramsey
A Scalable Conditional Independence Test for Nonlinear, Non-Gaussian Data
4 Figures, 2 Boxes, 1 Table, 15 Pages
null
null
null
cs.AI stat.ME
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Many relations of scientific interest are nonlinear, and even in linear systems distributions are often non-Gaussian, for example in fMRI BOLD data. A class of search procedures for causal relations in high dimensional data relies on sample derived conditional independence decisions. The most common applications rely on Gaussian tests that can be systematically erroneous in nonlinear non-Gaussian cases. Recent work (Gretton et al. (2009), Tillman et al. (2009), Zhang et al. (2011)) has proposed conditional independence tests using Reproducing Kernel Hilbert Spaces (RKHS). Among these, perhaps the most efficient has been KCI (Kernel Conditional Independence, Zhang et al. (2011)), with computational requirements that grow effectively at least as O(N3), placing it out of range of large sample size analysis, and restricting its applicability to high dimensional data sets. We propose a class of O(N2) tests using conditional correlation independence (CCI) that require a few seconds on a standard workstation for tests that require tens of minutes to hours for the KCI method, depending on degree of parallelization, with similar accuracy. For accuracy on difficult nonlinear, non-Gaussian data sets, we also compare a recent test due to Harris & Drton (2012), applicable to nonlinear, non-Gaussian distributions in the Gaussian copula, as well as to partial correlation, a linear Gaussian test.
[ { "created": "Mon, 20 Jan 2014 19:54:27 GMT", "version": "v1" }, { "created": "Wed, 29 Jan 2014 16:05:12 GMT", "version": "v2" } ]
2014-01-30
[ [ "Ramsey", "Joseph D.", "" ] ]
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1401.5037
Navin Kashyap
Manuj Mukherjee, Navin Kashyap, Yogesh Sankarasubramaniam
Achieving SK Capacity in the Source Model: When Must All Terminals Talk?
A 5-page version of this paper was submitted to the 2014 IEEE International Symposium on Information Theory (ISIT 2014)
null
10.1109/ISIT.2014.6875014
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we address the problem of characterizing the instances of the multiterminal source model of Csisz\'ar and Narayan in which communication from all terminals is needed for establishing a secret key of maximum rate. We give an information-theoretic sufficient condition for identifying such instances. We believe that our sufficient condition is in fact an exact characterization, but we are only able to prove this in the case of the three-terminal source model. We also give a relatively simple criterion for determining whether or not our condition holds for a given multiterminal source model.
[ { "created": "Mon, 20 Jan 2014 20:04:26 GMT", "version": "v1" } ]
2016-11-17
[ [ "Mukherjee", "Manuj", "" ], [ "Kashyap", "Navin", "" ], [ "Sankarasubramaniam", "Yogesh", "" ] ]
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1401.5039
Katherine Driggs-Campbell
Katherine Driggs-Campbell, Guillaume Bellegarda, Victor Shia, S. Shankar Sastry, and Ruzena Bajcsy
Experimental Design for Human-in-the-Loop Driving Simulations
null
null
null
null
cs.SY cs.HC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This report describes a new experimental setup for human-in-the-loop simulations. A force feedback simulator with four axis motion has been setup for real-time driving experiments. The simulator will move to simulate the forces a driver feels while driving, which allows for a realistic experience for the driver. This setup allows for flexibility and control for the researcher in a realistic simulation environment. Experiments concerning driver distraction can also be carried out safely in this test bed, in addition to multi-agent experiments. All necessary code to run the simulator, the additional sensors, and the basic processing is available for use.
[ { "created": "Mon, 20 Jan 2014 20:05:52 GMT", "version": "v1" } ]
2014-01-21
[ [ "Driggs-Campbell", "Katherine", "" ], [ "Bellegarda", "Guillaume", "" ], [ "Shia", "Victor", "" ], [ "Sastry", "S. Shankar", "" ], [ "Bajcsy", "Ruzena", "" ] ]
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1401.5051
Olivier Cur\'e
Olivier Cur\'e and Guillaume Blin and Dominique Revuz and David Faye
WaterFowl, a Compact, Self-indexed RDF Store with Inference-enabled Dictionaries
12 pages, 3 figures
null
null
null
cs.DB
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we present a novel approach -- called WaterFowl -- for the storage of RDF triples that addresses some key issues in the contexts of big data and the Semantic Web. The architecture of our prototype, largely based on the use of succinct data structures, enables the representation of triples in a self-indexed, compact manner without requiring decompression at query answering time. Moreover, it is adapted to efficiently support RDF and RDFS entailment regimes thanks to an optimized encoding of ontology concepts and properties that does not require a complete inference materialization or extensive query rewriting algorithms. This approach implies to make a distinction between the terminological and the assertional components of the knowledge base early in the process of data preparation, i.e., preprocessing the data before storing it in our structures. The paper describes the complete architecture of this system and presents some preliminary results obtained from evaluations conducted on our first prototype.
[ { "created": "Mon, 20 Jan 2014 20:48:05 GMT", "version": "v1" } ]
2014-01-21
[ [ "Curé", "Olivier", "" ], [ "Blin", "Guillaume", "" ], [ "Revuz", "Dominique", "" ], [ "Faye", "David", "" ] ]
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1401.5054
Jose Alberto Garc\'ia Guti\'errez Sr.
Jos\'e Alberto Garc\'ia Guti\'errez, Alejandro Mateo Hern\'andez D\'iaz
An\'alisis e implementaci\'on de algoritmos evolutivos para la optimizaci\'on de simulaciones en ingenier\'ia civil. (draft)
In Spanish. The authors acknowledge corrections, comments and suggestions to this paper, thanks.
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cs.NE cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper studies the applicability of evolutionary algorithms, particularly, the evolution strategies family in order to estimate a degradation parameter in the shear design of reinforced concrete members. This problem represents a great computational task and is highly relevant in the framework of the structural engineering that for the first time is solved using genetic algorithms. You are viewing a draft, the authors appreciate corrections, comments and suggestions to this work.
[ { "created": "Mon, 20 Jan 2014 20:55:13 GMT", "version": "v1" }, { "created": "Sun, 6 Apr 2014 19:29:19 GMT", "version": "v2" }, { "created": "Sat, 21 Jun 2014 20:07:11 GMT", "version": "v3" } ]
2014-06-24
[ [ "Gutiérrez", "José Alberto García", "" ], [ "Díaz", "Alejandro Mateo Hernández", "" ] ]
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1401.5086
Olivier Ruatta
Olivier Ruatta, Mark Sciabica, Agnes Szanto
Over-constrained Weierstrass iteration and the nearest consistent system
null
null
null
null
cs.SC math.OC
http://creativecommons.org/licenses/publicdomain/
We propose a generalization of the Weierstrass iteration for over-constrained systems of equations and we prove that the proposed method is the Gauss-Newton iteration to find the nearest system which has at least $k$ common roots and which is obtained via a perturbation of prescribed structure. In the univariate case we show the connection of our method to the optimization problem formulated by Karmarkar and Lakshman for the nearest GCD. In the multivariate case we generalize the expressions of Karmarkar and Lakshman, and give explicitly several iteration functions to compute the optimum. The arithmetic complexity of the iterations is detailed.
[ { "created": "Mon, 20 Jan 2014 21:07:54 GMT", "version": "v1" } ]
2014-01-22
[ [ "Ruatta", "Olivier", "" ], [ "Sciabica", "Mark", "" ], [ "Szanto", "Agnes", "" ] ]
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1401.5092
Quan Geng
Quan Geng and Tie Liu
Symmetric Two-User Gaussian Interference Channel with Common Messages
13 pages, 1 figure
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We consider symmetric two-user Gaussian interference channel with common messages. We derive an upper bound on the sum capacity, and show that the upper bound is tight in the low interference regime, where the optimal transmission scheme is to send no common messages and each receiver treats interference as noise. Our result shows that although the availability of common messages provides a cooperation opportunity for transmitters, in the low interference regime the presence of common messages does not help increase the sum capacity.
[ { "created": "Mon, 20 Jan 2014 21:21:44 GMT", "version": "v1" } ]
2014-01-22
[ [ "Geng", "Quan", "" ], [ "Liu", "Tie", "" ] ]
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1401.5093
Travis Martin
Travis Martin, Xiao Zhang, and M. E. J. Newman
Localization and centrality in networks
5 pages, 1 figure
Phys. Rev. E 90, 052808 (2014)
10.1103/PhysRevE.90.052808
null
cs.SI cond-mat.stat-mech physics.soc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Eigenvector centrality is a common measure of the importance of nodes in a network. Here we show that under common conditions the eigenvector centrality displays a localization transition that causes most of the weight of the centrality to concentrate on a small number of nodes in the network. In this regime the measure is no longer useful for distinguishing among the remaining nodes and its efficacy as a network metric is impaired. As a remedy, we propose an alternative centrality measure based on the nonbacktracking matrix, which gives results closely similar to the standard eigenvector centrality in dense networks where the latter is well behaved, but avoids localization and gives useful results in regimes where the standard centrality fails.
[ { "created": "Mon, 20 Jan 2014 21:22:40 GMT", "version": "v1" }, { "created": "Sat, 3 Jan 2015 15:49:15 GMT", "version": "v2" } ]
2015-01-06
[ [ "Martin", "Travis", "" ], [ "Zhang", "Xiao", "" ], [ "Newman", "M. E. J.", "" ] ]
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1401.5097
Olle Fredriksson
Olle Fredriksson
Distributed call-by-value machines
null
null
null
null
cs.PL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a new abstract machine, called DCESH, which describes the execution of higher-order programs running in distributed architectures. DCESH implements a generalised form of Remote Procedure Call that supports calling higher-order functions across node boundaries, without sending actual code. Our starting point is a variant of the SECD machine that we call the CES machine, which implements reduction for untyped call-by-value PCF. We successively add the features that we need for distributed execution and show the correctness of each addition. First we add heaps, forming the CESH machine, which provides features necessary for more efficient execution, and show that there is a bisimulation between the CES and the CESH machine. Then we construct a two-level operational semantics, where the high level is a network of communicating machines, and the low level is given by local machine transitions. Using these networks, we arrive at our final system, the distributed CESH machine (DCESH). We show that there is a bisimulation relation also between the CESH machine and the DCESH machine. All the technical results have been formalised and proved correct in Agda, and a prototype compiler has been developed.
[ { "created": "Mon, 20 Jan 2014 21:32:38 GMT", "version": "v1" } ]
2014-01-22
[ [ "Fredriksson", "Olle", "" ] ]
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1401.5098
Mohamed A. El-Sayed
Mohamed A. El-Sayed, S. Abdel-Khalek, and Eman Abdel-Aziz
Study of Efficient Technique Based On 2D Tsallis Entropy For Image Thresholding
null
International Journal on Computer Science and Engineering (IJCSE), Vol. 3 No. 9, pp. 3125-3138, 2011
null
null
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Thresholding is an important task in image processing. It is a main tool in pattern recognition, image segmentation, edge detection and scene analysis. In this paper, we present a new thresholding technique based on two-dimensional Tsallis entropy. The two-dimensional Tsallis entropy was obtained from the twodimensional histogram which was determined by using the gray value of the pixels and the local average gray value of the pixels, the work it was applied a generalized entropy formalism that represents a recent development in statistical mechanics. The effectiveness of the proposed method is demonstrated by using examples from the real-world and synthetic images. The performance evaluation of the proposed technique in terms of the quality of the thresholded images are presented. Experimental results demonstrate that the proposed method achieve better result than the Shannon method.
[ { "created": "Mon, 20 Jan 2014 21:36:51 GMT", "version": "v1" } ]
2014-01-22
[ [ "El-Sayed", "Mohamed A.", "" ], [ "Abdel-Khalek", "S.", "" ], [ "Abdel-Aziz", "Eman", "" ] ]
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1401.5099
Cedric Westphal
Cedric Westphal
A Stable Fountain Code Mechanism for Peer-to-Peer Content Distribution
accepted to IEEE INFOCOM 2014, 9 pages
null
10.1109/INFOCOM.2014.6848204
null
cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Most peer-to-peer content distribution systems require the peers to privilege the welfare of the overall system over greedily maximizing their own utility. When downloading a file broken up into multiple pieces, peers are often asked to pass on some possible download opportunities of common pieces in order to favor rare pieces. This is to avoid the missing piece syndrome, which throttles the download rate of the peer-to-peer system to that of downloading the file straight from the server. In other situations, peers are asked to stay in the system even though they have collected all the file's pieces and have an incentive to leave right away. We propose a mechanism which allows peers to act greedily and yet stabilizes the peer-to-peer content sharing system. Our mechanism combines a fountain code at the server to generate innovative new pieces, and a prioritization for the server to deliver pieces only to new peers. While by itself, neither the fountain code nor the prioritization of new peers alone stabilizes the system, we demonstrate that their combination does, through both analytical and numerical evaluation.
[ { "created": "Mon, 20 Jan 2014 21:38:56 GMT", "version": "v1" } ]
2016-11-17
[ [ "Westphal", "Cedric", "" ] ]
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1401.5102
Felipe Gomez Cuba
Felipe G\'omez-Cuba, Francisco J. Gonz\'alez-Casta\~no
Improving Third-Party Relaying for LTE-A: A Realistic Simulation Approach
17 one-column pages, 9 figures, accepted for publication in IEEE ICC 2014 MWN
null
null
null
cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this article we propose solutions to diverse conflicts that result from the deployment of the (still immature) relay node (RN) technology in LTE-A networks. These conflicts and their possible solutions have been observed by implementing standard-compliant relay functionalities on the Vienna simulator. As an original experimental approach, we model realistic RN operation, taking into account that transmitters are not active all the time due to half-duplex RN operation. We have rearranged existing elements in the simulator in a manner that emulates RN behavior, rather than implementing a standalone brand-new component for the simulator. We also study analytically some of the issues observed in the interaction between the network and the RNs, to draw conclusions beyond simulation observation. The main observations of this paper are that: $i$) Additional time-varying interference management steps are needed, because the LTE-A standard employs a fixed time division between eNB-RN and RN-UE transmissions (typical relay capacity or throughput research models balance them optimally, which is unrealistic nowadays); $ii$) There is a trade-off between the time-division constraints of relaying and multi-user diversity; the stricter the constraints on relay scheduling are, the less flexibility schedulers have to exploit channel variation; and $iii$) Thee standard contains a variety of parameters for relaying configuration, but not all cases of interest are covered.
[ { "created": "Mon, 20 Jan 2014 21:47:20 GMT", "version": "v1" } ]
2014-01-22
[ [ "Gómez-Cuba", "Felipe", "" ], [ "González-Castaño", "Francisco J.", "" ] ]
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1401.5107
Martin Hofmann
Martin Hofmann and Wei Chen
B\"uchi Types for Infinite Traces and Liveness
null
null
null
null
cs.LO cs.PL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We develop a new type and effect system based on B\"uchi automata to capture finite and infinite traces produced by programs in a small language which allows non-deterministic choices and infinite recursions. There are two key technical contributions: (a) an abstraction based on equivalence relations defined by the policy B\"uchi automaton, the B\"uchi abstraction; (b) a novel type and effect system to correctly capture infinite traces. We show how the B\"uchi abstraction fits into the abstract interpretation framework and show soundness and completeness.
[ { "created": "Mon, 20 Jan 2014 22:06:15 GMT", "version": "v1" } ]
2014-01-22
[ [ "Hofmann", "Martin", "" ], [ "Chen", "Wei", "" ] ]
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1401.5108
Mohamed A. El-Sayed
Mohamed A. El-Sayed and Mohamed A. Khafagy
An Identification System Using Eye Detection Based On Wavelets And Neural Networks
Mohamed A. El-Sayed and Mohamed A. Khafagy, An Identification System Using Eye Detection Based On Wavelets And Neural Networks. International Journal Of Computer And Information Technology. Vol. 1, No. 2, pp. 43-48, 2012. arXiv admin note: text overlap with arXiv:1205.5097 by other authors without attribution
International Journal Of Computer And Information Technology, 2012
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cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The randomness and uniqueness of human eye patterns is a major breakthrough in the search for quicker, easier and highly reliable forms of automatic human identification. It is being used extensively in security solutions. This includes access control to physical facilities, security systems and information databases, Suspect tracking, surveillance and intrusion detection and by various Intelligence agencies through out the world. We use the advantage of human eye uniqueness to identify people and approve its validity as a biometric. . Eye detection involves first extracting the eye from a digital face image, and then encoding the unique patterns of the eye in such a way that they can be compared with pre-registered eye patterns. The eye detection system consists of an automatic segmentation system that is based on the wavelet transform, and then the Wavelet analysis is used as a pre-processor for a back propagation neural network with conjugate gradient learning. The inputs to the neural network are the wavelet maxima neighborhood coefficients of face images at a particular scale. The output of the neural network is the classification of the input into an eye or non-eye region. An accuracy of 90% is observed for identifying test images under different conditions included in training stage.
[ { "created": "Mon, 20 Jan 2014 22:10:52 GMT", "version": "v1" } ]
2014-01-22
[ [ "El-Sayed", "Mohamed A.", "" ], [ "Khafagy", "Mohamed A.", "" ] ]
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1401.5110
Dmitri A. Uzdensky
Dmitri A. Uzdensky and Shane Rightley
Plasma Physics of Extreme Astrophysical Environments
56 pages, 1 figure. Invited review accepted for publication in Reports on Progress in Physics
null
10.1088/0034-4885/77/3/036902
null
astro-ph.HE physics.plasm-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Certain classes of astrophysical objects, namely magnetars and central engines of supernovae and gamma-ray bursts (GRBs), are characterized by extreme physical conditions not encountered elsewhere in the Universe. In particular, they possess magnetic fields that exceed the critical quantum field of 44 teragauss. Figuring out how these complex ultra-magnetized systems work requires understanding various plasma processes, both small-scale kinetic and large-scale magnetohydrodynamic (MHD). However, an ultra-strong magnetic field modifies the underlying physics to such an extent that many relevant plasma-physical problems call for building QED-based relativistic quantum plasma physics. In this review, after describing the extreme astrophysical systems of interest and identifying the key relevant plasma-physical problems, we survey the recent progress in the development of such a theory. We discuss how a super-critical field modifies the properties of vacuum and matter and outline the basic theoretical framework for describing both non-relativistic and relativistic quantum plasmas. We then turn to astrophysical applications of relativistic QED plasma physics relevant to magnetar magnetospheres and central engines of supernovae and long GRBs. Specifically, we discuss propagation of light through a magnetar magnetosphere; large-scale MHD processes driving magnetar activity and GRB jet launching and propagation; energy-transport processes governing the thermodynamics of extreme plasma environments; micro-scale kinetic plasma processes important in the interaction of intense magnetospheric electric currents with a magnetar's surface; and magnetic reconnection of ultra-strong magnetic fields. Finally, we point out that future progress will require the development of numerical modeling capabilities.
[ { "created": "Mon, 20 Jan 2014 22:31:40 GMT", "version": "v1" } ]
2015-06-18
[ [ "Uzdensky", "Dmitri A.", "" ], [ "Rightley", "Shane", "" ] ]
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1401.5111
Dave Stikkolorum
Dave R. Stikkolorum, Michel R.V. Chaudron, Oswald de Bruin
The Art of Software Design, a Video Game for Learning Software Design Principles
Winning paper gamification contest at ACM/IEEE 15th International Conference on Model Driven Engineering Languages and Systems (Models 2012, Innsbruck)
null
null
null
cs.HC cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper introduces our gamification of a part of our software design curriculum. Based on typical design principles a motivating learning game is developed to train students in software design. We use Bloom's taxonomy to determine learning objectives. We keep the player engaged with direct feedback in a challenging level based game with increasing complexity. Players can evaluate their design actions with the help of the visualisation of control and data flows. The main learning objective: applying design principles, fits the game's main activity. This supports the learning by doing approach of lecturers. A user test indicates possible learning effects and a playable game.
[ { "created": "Mon, 20 Jan 2014 22:36:27 GMT", "version": "v1" } ]
2014-01-22
[ [ "Stikkolorum", "Dave R.", "" ], [ "Chaudron", "Michel R. V.", "" ], [ "de Bruin", "Oswald", "" ] ]
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1401.5113
Samson Abramsky
Samson Abramsky
Retracing some paths in Process Algebra
17 pages
In CONCUR'96: Concurrency Theory, pp. 1-17. Springer Berlin Heidelberg, 1996
null
null
cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We use traced monoidal categories to give a precise general version of "geometry of interaction". We give a number of examples of both "particle-style" and "wave-style" instances of this construction. We relate these ideas to semantics of computation.
[ { "created": "Mon, 20 Jan 2014 22:51:06 GMT", "version": "v1" } ]
2014-01-22
[ [ "Abramsky", "Samson", "" ] ]
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1401.5124
Victoria Kostina
Victoria Kostina, Sergio Verd\'u
Channels with cost constraints: strong converse and dispersion
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IEEE Transactions on Information Theory, vol. 61, no. 5, pp. 2415-2429, May 2015
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper shows the strong converse and the dispersion of memoryless channels with cost constraints and performs refined analysis of the third order term in the asymptotic expansion of the maximum achievable channel coding rate, showing that it is equal to $\frac 1 2 \frac {\log n}{n}$ in most cases of interest. The analysis is based on a non-asymptotic converse bound expressed in terms of the distribution of a random variable termed the $\mathsf b$-tilted information density, which plays a role similar to that of the $\mathsf d$-tilted information in lossy source coding. We also analyze the fundamental limits of lossy joint-source-channel coding over channels with cost constraints.
[ { "created": "Mon, 20 Jan 2014 23:24:11 GMT", "version": "v1" }, { "created": "Fri, 30 May 2014 17:13:44 GMT", "version": "v2" }, { "created": "Thu, 8 Oct 2015 02:50:02 GMT", "version": "v3" } ]
2015-10-09
[ [ "Kostina", "Victoria", "" ], [ "Verdú", "Sergio", "" ] ]
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1401.5125
Victoria Kostina
Victoria Kostina, Sergio Verd\'u
Nonasymptotic noisy lossy source coding
IEEE Transactions on Information Theory, 2016
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper shows new general nonasymptotic achievability and converse bounds and performs their dispersion analysis for the lossy compression problem in which the compressor observes the source through a noisy channel. While this problem is asymptotically equivalent to a noiseless lossy source coding problem with a modified distortion function, nonasymptotically there is a noticeable gap in how fast their minimum achievable coding rates approach the common rate-distortion function, as evidenced both by the refined asymptotic analysis (dispersion) and the numerical results. The size of the gap between the dispersions of the noisy problem and the asymptotically equivalent noiseless problem depends on the stochastic variability of the channel through which the compressor observes the source.
[ { "created": "Mon, 20 Jan 2014 23:32:09 GMT", "version": "v1" }, { "created": "Fri, 16 Sep 2016 03:14:57 GMT", "version": "v2" } ]
2016-09-19
[ [ "Kostina", "Victoria", "" ], [ "Verdú", "Sergio", "" ] ]
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1401.5126
Benjamin Anderson
Benjamin R. Anderson and Mark G. Kuzyk
Mechanisms of the refractive index change in DO11/PMMA due to photodegradation
5 pages 6 figures
null
10.1016/j.optmat.2014.03.004
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Using a white light interferometric microscope (WLIM) we measure the photodamage induced change in the complex index of refraction of disperse orange 11 (DO11) dye-doped (poly)methyl-methacrylate. We find that the change in the imaginary part of the refractive index is consistent with previous measurements of photodamage-induced absorbance change. Additionally, we find that the change in the real refractive index can be separated into a component due to damage to the dye molecules and a component due to irreversible damage to the polymer.
[ { "created": "Mon, 20 Jan 2014 23:36:59 GMT", "version": "v1" } ]
2015-06-18
[ [ "Anderson", "Benjamin R.", "" ], [ "Kuzyk", "Mark G.", "" ] ]
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1401.5136
Cong Li
Cong Li, Michael Georgiopoulos, Georgios C. Anagnostopoulos
A Unifying Framework for Typical Multi-Task Multiple Kernel Learning Problems
17 pages, 1 figure. Accepted by IEEE Transactions on Neural Networks and Learning Systems; currently published as Early Access Article
null
null
null
cs.LG
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Over the past few years, Multi-Kernel Learning (MKL) has received significant attention among data-driven feature selection techniques in the context of kernel-based learning. MKL formulations have been devised and solved for a broad spectrum of machine learning problems, including Multi-Task Learning (MTL). Solving different MKL formulations usually involves designing algorithms that are tailored to the problem at hand, which is, typically, a non-trivial accomplishment. In this paper we present a general Multi-Task Multi-Kernel Learning (Multi-Task MKL) framework that subsumes well-known Multi-Task MKL formulations, as well as several important MKL approaches on single-task problems. We then derive a simple algorithm that can solve the unifying framework. To demonstrate the flexibility of the proposed framework, we formulate a new learning problem, namely Partially-Shared Common Space (PSCS) Multi-Task MKL, and demonstrate its merits through experimentation.
[ { "created": "Tue, 21 Jan 2014 01:16:44 GMT", "version": "v1" } ]
2014-01-22
[ [ "Li", "Cong", "" ], [ "Georgiopoulos", "Michael", "" ], [ "Anagnostopoulos", "Georgios C.", "" ] ]
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1401.5143
Yasuo Tabei
Shirou Maruyama and Yasuo Tabei
Fully Online Grammar Compression in Constant Space
This is an extended version of a proceeding accepted to Data Compression Conference (DCC), 2014
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null
null
cs.DS
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present novel variants of fully online LCA (FOLCA), a fully online grammar compression that builds a straight line program (SLP) and directly encodes it into a succinct representation in an online manner. FOLCA enables a direct encoding of an SLP into a succinct representation that is asymptotically equivalent to an information theoretic lower bound for representing an SLP (Maruyama et al., SPIRE'13). The compression of FOLCA takes linear time proportional to the length of an input text and its working space depends only on the size of the SLP, which enables us to apply FOLCA to large-scale repetitive texts. Recent repetitive texts, however, include some noise. For example, current sequencing technology has significant error rates, which embeds noise into genome sequences. For such noisy repetitive texts, FOLCA working in the SLP size consumes a large amount of memory. We present two variants of FOLCA working in constant space by leveraging the idea behind stream mining techniques. Experiments using 100 human genomes corresponding to about 300GB from the 1000 human genomes project revealed the applicability of our method to large-scale, noisy repetitive texts.
[ { "created": "Tue, 21 Jan 2014 01:41:17 GMT", "version": "v1" }, { "created": "Wed, 29 Jan 2014 06:37:29 GMT", "version": "v2" } ]
2014-01-30
[ [ "Maruyama", "Shirou", "" ], [ "Tabei", "Yasuo", "" ] ]
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1401.5148
Bahman Kalantari
Bahman Kalantari
Solving Cubic Equations By the Quadratic Formula
6 pages, 2 figures
null
null
null
cs.NA math.NA
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Let $p(z)$ be a monic cubic complex polynomial with distinct roots and distinct critical points. We say a critical point has the {\it Voronoi property} if it lies in the Voronoi cell of a root $\theta$, $V(\theta)$, i.e. the set of points that are closer to $\theta$ than to the other roots. We prove at least one critical point has the Voronoi property and characterize the cases when both satisfy this property. It is known that for any $\xi \in V(\theta)$, the sequence $B_m(\xi) =\xi - p(\xi) d_{m-2}/d_{m-1}$ converges to $\theta$, where $d_m$ satisfies the recurrence $d_m =p'(\xi)d_{m-1}-0.5 p(\xi)p''(\xi)d_{m-2} +p^2(\xi)d_{m-3}$, $d_0 =1, d_{-1}=d_{-2}=0$. Thus by the Voronoi property, there is a solution $c$ of $p'(z)=0$ where $B_m(c)$ converges to a root of $p(z)$. The speed of convergence is dependent on the ratio of the distances between $c$ and the closest and the second closest roots of $p(z)$. This results in a different algorithm for solving a cubic equation than the classical methods. We give polynomiography for an example.
[ { "created": "Tue, 21 Jan 2014 02:19:26 GMT", "version": "v1" } ]
2014-01-22
[ [ "Kalantari", "Bahman", "" ] ]
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1401.5151
Yoshiyuki Kabashima
Yoshiyuki Kabashima and Mikko Vehkapera
Signal recovery using expectation consistent approximation for linear observations
5 pages, 1 figure
ISIT 2014 proceedings pp. 226-230 (2014)
null
null
cs.IT cond-mat.dis-nn math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A signal recovery scheme is developed for linear observation systems based on expectation consistent (EC) mean field approximation. Approximate message passing (AMP) is known to be consistent with the results obtained using the replica theory, which is supposed to be exact in the large system limit, when each entry of the observation matrix is independently generated from an identical distribution. However, this is not necessarily the case for general matrices. We show that EC recovery exhibits consistency with the replica theory for a wider class of random observation matrices. This is numerically confirmed by experiments for the Bayesian optimal signal recovery of compressed sensing using random row-orthogonal matrices.
[ { "created": "Tue, 21 Jan 2014 02:31:03 GMT", "version": "v1" }, { "created": "Mon, 7 Jul 2014 01:09:37 GMT", "version": "v2" } ]
2014-07-08
[ [ "Kabashima", "Yoshiyuki", "" ], [ "Vehkapera", "Mikko", "" ] ]
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1401.5155
Jafar Shayan
Jafar Shayan, Ahmad Azarnik, Suriayati Chuprat, Sasan Karamizadeh, Mojtaba Alizadeh
Identifying Benefits and risks associated with utilizing cloud computing
null
null
10.7321/jscse.v3.n3.63
null
cs.DC cs.CY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Cloud computing is an emerging computing model where IT and computing operations are delivered as services in highly scalable and cost effective manner. Recently, embarking this new model in business has become popular. Companies in diverse sectors intend to leverage cloud computing architecture, platforms and applications in order to gain higher competitive advantages. Likewise other models, cloud computing brought advantages to attract business but meanwhile fostering cloud has led to some risks, which can cause major impacts if business does not plan for mitigation. This paper surveys the advantages of cloud computing and in contrast the risks associated using them. Finally we conclude that a well-defined risk management program that focused on cloud computing is an essential part of gaining value from benefits of cloud computing.
[ { "created": "Tue, 21 Jan 2014 02:52:39 GMT", "version": "v1" } ]
2014-01-22
[ [ "Shayan", "Jafar", "" ], [ "Azarnik", "Ahmad", "" ], [ "Chuprat", "Suriayati", "" ], [ "Karamizadeh", "Sasan", "" ], [ "Alizadeh", "Mojtaba", "" ] ]
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1401.5156
Juliana Wahid
Juliana Wahid, Naimah Mohd Hussin
Harmony Search Algorithm for Curriculum-Based Course Timetabling Problem
null
International Journal of Soft Computing and Software Engineering [JSCSE], Vol. 3, No. 3, pp. 365-371, 2013
10.7321/jscse.v3.n3.55
null
cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, harmony search algorithm is applied to curriculum-based course timetabling. The implementation, specifically the process of improvisation consists of memory consideration, random consideration and pitch adjustment. In memory consideration, the value of the course number for new solution was selected from all other course number located in the same column of the Harmony Memory. This research used the highest occurrence of the course number to be scheduled in a new harmony. The remaining courses that have not been scheduled by memory consideration will go through random consideration, i.e. will select any feasible location available to be scheduled in the new harmony solution. Each course scheduled out of memory consideration is examined as to whether it should be pitch adjusted with probability of eight procedures. However, the algorithm produced results that were not comparatively better than those previously known as best solution. With proper modification in terms of the approach in this algorithm would make the algorithm perform better on curriculum-based course timetabling.
[ { "created": "Tue, 21 Jan 2014 03:01:50 GMT", "version": "v1" } ]
2014-01-22
[ [ "Wahid", "Juliana", "" ], [ "Hussin", "Naimah Mohd", "" ] ]
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1401.5157
Toshiyuki Maeda
Toshiyuki Maeda, Masanori Fujii, Isao Hayashi
Skill Analysis with Time Series Image Data
5 pages, 6 figures
International Journal of Soft Computing and Software Engineering [JSCSE], Vol. 3, No. 3, pp. 576-580, 2013
10.7321/jscse.v3.n3.87
null
cs.AI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a skill analysis with time series image data using data mining methods, focused on table tennis. We do not use body model, but use only hi-speed movies, from which time series data are obtained and analyzed using data mining methods such as C4.5 and so on. We identify internal models for technical skills as evaluation skillfulness for the forehand stroke of table tennis, and discuss mono and meta-functional skills for improving skills.
[ { "created": "Tue, 21 Jan 2014 03:03:56 GMT", "version": "v1" } ]
2014-01-22
[ [ "Maeda", "Toshiyuki", "" ], [ "Fujii", "Masanori", "" ], [ "Hayashi", "Isao", "" ] ]
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1401.5161
Jiro Murata
S. Tanaka, S. Ozaki, Y. Sakamoto, R. Tanuma, T. Yoshida and J. Murata
Development of a novel scintillation-trigger detector for the MTV experiment using aluminum-metallized film tapes
to be published in Nuclear Instruments and Methods A
Nuclear Instruments and Methods in Physics Research A 752 (2014) 47-53
10.1016/j.nima.2014.03.025
null
physics.ins-det hep-ex
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
A new type of a trigger-scintillation counter array designed for the MTV experiment at TRIUMF-ISAC has been developed, which uses aluminum-metallized film tape for wrapping to achieve the required assembling precision of $\pm$0.5 mm. The MTV experiment uses a cylindrical drift chamber (CDC) as the main electron-tracking detector. The barrel-type trigger counter is placed inside the CDC to generate a trigger signal using 1 mm thick, 300 mm long thin plastic scintillation counters. Detection efficiency and light attenuation compared with conventional wrapping materials are studied.
[ { "created": "Tue, 21 Jan 2014 03:15:23 GMT", "version": "v1" }, { "created": "Thu, 13 Mar 2014 06:32:15 GMT", "version": "v2" } ]
2015-05-21
[ [ "Tanaka", "S.", "" ], [ "Ozaki", "S.", "" ], [ "Sakamoto", "Y.", "" ], [ "Tanuma", "R.", "" ], [ "Yoshida", "T.", "" ], [ "Murata", "J.", "" ] ]
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1401.5162
Nalika Ulapane
Nalika Ulapane, Sunil Abeyratne, Prabath Binduhewa, Chamari Dhanapala, Shyama Wickramasinghe, Nimal Rathnayake
A Simple Software Application for Simulating Commercially Available Solar Panels
21 pages, 8 figures, 2 tables
International Journal of Soft Computing And Software Engineering (JSCSE) e-ISSN: 2251-7545 Vol.2, No.5, 2012
10.7321/jscse.v2.n5.5
null
cs.CE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This article addresses the formulation and validation of a simple PC based software application developed for simulating commercially available solar panels. The important feature of this application is its capability to produce speedy results in the form of solar panel output characteristics at given environmental conditions by using minimal input data. Besides, it is able to deliver critical information about the maximum power point of the panel at a given environmental condition in quick succession. The application is based on a standard equation which governs solar panels and works by means of estimating unknown parameters in the equation to fit a given solar panel. The process of parameter estimation is described in detail with the aid of equations and data of a commercial solar panel. A validation of obtained results for commercial solar panels is also presented by comparing the panel manufacturers' results with the results generated by the application. In addition, implications of the obtained results are discussed along with possible improvements to the developed software application.
[ { "created": "Tue, 21 Jan 2014 03:20:10 GMT", "version": "v1" } ]
2014-01-22
[ [ "Ulapane", "Nalika", "" ], [ "Abeyratne", "Sunil", "" ], [ "Binduhewa", "Prabath", "" ], [ "Dhanapala", "Chamari", "" ], [ "Wickramasinghe", "Shyama", "" ], [ "Rathnayake", "Nimal", "" ] ]
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1401.5163
Alexandre Melo M
Alexandre M Melo Silva, Christiano C Maciel, Suelene do Carmo Correa
Multi-hop Energy-efficient Control for Heterogeneous Wireless Sensor Networks Using Fuzzy Logic
2013 JSCSE
JSCSE Vol. 3, No. 3, 2013
10.7321/jscse.v3.n3.10
SCSE'13 2013
cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Wireless Sensor Networks (WSN) have severe energy constraints imposed by limited capacity of the internal battery of sensor nodes. These restrictions stimulate the development of energy-efficient strategies aimed at increasing the period of stability and lifetime of these networks. In this paper, we propose a centralized control to elect more appropriate Cluster Heads, assuming three levels of heterogeneity and multi-hop communication between Cluster Heads. The centralized control uses the k-means algorithm, responsible for the division of clusters and Fuzzy Logic to elect the Cluster Head and selecting the best route of communication. The study results indicate that the proposed approach can increase the period of stability and lifetime in WSN.
[ { "created": "Tue, 21 Jan 2014 03:22:20 GMT", "version": "v1" } ]
2014-01-22
[ [ "Silva", "Alexandre M Melo", "" ], [ "Maciel", "Christiano C", "" ], [ "Correa", "Suelene do Carmo", "" ] ]
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1401.5165
Yeresime Suresh
Yeresime Suresh and Santanu Ku. Rath
A Genetic Algorithm based Approach for Test Data Generation in Basis Path Testing
7 pages, 5 figures
null
10.7321/jscse.v3.n3.49
null
cs.SE
http://creativecommons.org/licenses/by-nc-sa/3.0/
Software Testing is a process to identify the quality and reliability of software, which can be achieved through the help of proper test data. However, doing this manually is a difficult task due to the presence of number of predicate nodes in the module. So, this leads towards a problem of NP-complete. Therefore some intelligence-based search algorithms have to be used to generate test data. In this paper, we use a soft computing based approach, genetic algorithm to generate test data based on the set of basis paths. This paper combines the characteristics of genetic algorithm with test data, making use of the merits of respective global and local optimization capability to improve the generation capacity of test data. This automated process of generating test data optimally helps in reducing the test effort and time of a tester. Finally, the proposed approach is applied for ATM withdrawal task. Experimental results show that genetic algorithm was able to generate suitable test data based on a fitness value and avoid redundant data by optimization.
[ { "created": "Tue, 21 Jan 2014 03:23:48 GMT", "version": "v1" } ]
2014-01-22
[ [ "Suresh", "Yeresime", "" ], [ "Rath", "Santanu Ku.", "" ] ]
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1401.5168
Xuan Guang
Jiyong Lu, Xuan Guang, and Fang-Wei Fu
Distributed Storage Schemes over Unidirectional Ring Networks
two columns, 5 pages, 8 figures, and submitted to the ISIT 2014
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null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we study distributed storage problems over unidirectional ring networks. A lower bound on the reconstructing bandwidth to recover total original data for each user is proposed, and it is achievable for arbitrary parameters. If a distributed storage scheme can achieve this lower bound with equality for each user, we say it an optimal reconstructing distributed storage scheme (ORDSS). Furthermore, the repair problem for a failed storage node in ORDSSes is under consideration and a tight lower bound on the repair bandwidth for each storage node is obtained. Particularly, we indicate the fact that for any ORDSS, every storage node can be repaired with repair bandwidth achieving the lower bound with equality. In addition, we present an efficient approach to construct ORDSSes for arbitrary parameters by using the concept of Euclidean division. Finally, we take an example to characterize the above approach.
[ { "created": "Tue, 21 Jan 2014 03:36:07 GMT", "version": "v1" } ]
2014-01-22
[ [ "Lu", "Jiyong", "" ], [ "Guang", "Xuan", "" ], [ "Fu", "Fang-Wei", "" ] ]
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1401.5169
Feng Wang
X. G. Ma and F. Wang
Calculations of gamma-ray spectral profiles of linear alkanes in the positron annihilation process
15 pages, 2 tables and 3 figures
null
null
null
physics.chem-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The positron-electron annihilation gamma-ray spectra of linear alkanes CnH2n+2 (n=1-12) have been studied systematically. A profile quality (PQ) parameter, is introduced to assess the agreement between the obtained theoretical profiles and the experimental measurements in the entire region of energy shift of the spectra. Together with the Doppler shift of the gamma-ray spectra, the two parameters,PQ and Doppler shift, are able to provide a more comprehensive assessment of the calculated gamma-ray spectra with respect to available experiment. Applying the recently developed docking model, the present study determines the positrophilic electrons for individual alkanes from which the gamma-ray spectral profiles are calculated. The results achieve an excellent agreement with experiment, not only with respect to the Doppler shift, but also with respect to the gamma-ray profiles in the photon energy region up to 5 keV. The study further calculates the gamma-ray spectra of other linear alkanes in the series without available experimental measurements, such as heptane (C7H16), octane (C8H18), decane (C10H22) and undecane (C11H24). The results obtained show a dominance of the positrophilic electrons in the lowest occupied valence orbital (LOVO) in the positron-electron annihilation process, in agreement with previous studies.
[ { "created": "Tue, 21 Jan 2014 04:02:24 GMT", "version": "v1" } ]
2014-01-22
[ [ "Ma", "X. G.", "" ], [ "Wang", "F.", "" ] ]
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1401.5174
Zhi Li
Zhi Li, Ali C. Begen, Joshua Gahm, Yufeng Shan, Bruce Osler, David Oran
Streaming Video over HTTP with Consistent Quality
Refined version submitted to ACM Multimedia Systems Conference (MMSys), 2014
null
null
null
cs.NI cs.MM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In conventional HTTP-based adaptive streaming (HAS), a video source is encoded at multiple levels of constant bitrate representations, and a client makes its representation selections according to the measured network bandwidth. While greatly simplifying adaptation to the varying network conditions, this strategy is not the best for optimizing the video quality experienced by end users. Quality fluctuation can be reduced if the natural variability of video content is taken into consideration. In this work, we study the design of a client rate adaptation algorithm to yield consistent video quality. We assume that clients have visibility into incoming video within a finite horizon. We also take advantage of the client-side video buffer, by using it as a breathing room for not only network bandwidth variability, but also video bitrate variability. The challenge, however, lies in how to balance these two variabilities to yield consistent video quality without risking a buffer underrun. We propose an optimization solution that uses an online algorithm to adapt the video bitrate step-by-step, while applying dynamic programming at each step. We incorporate our solution into PANDA -- a practical rate adaptation algorithm designed for HAS deployment at scale.
[ { "created": "Tue, 21 Jan 2014 04:35:08 GMT", "version": "v1" } ]
2014-01-22
[ [ "Li", "Zhi", "" ], [ "Begen", "Ali C.", "" ], [ "Gahm", "Joshua", "" ], [ "Shan", "Yufeng", "" ], [ "Osler", "Bruce", "" ], [ "Oran", "David", "" ] ]
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1401.5175
Tanmay Sinha
Tanmay Sinha
Supporting MOOC Instruction with Social Network Analysis
10 pages, 4 figures, 3 tables
null
null
null
cs.SI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
With an expansive and ubiquitously available gold mine of educational data, Massive Open Online courses (MOOCs) have become the an important foci of learning analytics research. In this paper, we investigate potential reasons as to why are these digitalized learning repositories being plagued with huge attrition rates. We analyze an ongoing online course offered in Coursera using a social network perspective, with an objective to identify students who are actively participating in course discussions and those who are potentially at a risk of dropping off. We additionally perform extensive forum analysis to visualize student's posting patterns longitudinally. Our results provide insights that can assist educational designers in establishing a pedagogical basis for decision-making while designing MOOCs. We infer prominent characteristics about the participation patterns of distinct groups of students in the networked learning community, and effectively discover important discussion threads. These methods can, despite the otherwise prohibitive number of students involved, allow an instructor to leverage forum behavior to identify opportunities for support.
[ { "created": "Tue, 21 Jan 2014 04:53:41 GMT", "version": "v1" } ]
2014-01-22
[ [ "Sinha", "Tanmay", "" ] ]
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1401.5176
Casey Meakin
Miroslav Moc\'ak (1), Casey Meakin (1,2,3), Maxime Viallet (4), David Arnett (2), ((1) Los Alamos, (2) Steward Observatory, (3) New Mexico Consortium, (4) MPIA)
Compressible Hydrodynamic Mean-Field Equations in Spherical Geometry and their Application to Turbulent Stellar Convection Data
176 Pages, 115 Figures
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astro-ph.SR physics.flu-dyn physics.geo-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present a statistical analysis of turbulent convection in stars within our Reynolds-Averaged Navier Stokes (RANS) framework in spherical geometry which we derived from first principles. The primary results reported in this document include: (1) an extensive set of mean-field equations for compressible, multi-species hydrodynamics, and (2) corresponding mean-field data computed from various simulation models. Some supplementary scale analysis data is also presented. The simulation data which is presented includes: (1) shell convection during oxygen burning in a 23 solar mass supernova progenitor, (2) envelope convection in a 5 solar mass red giant, (3) shell convection during the helium flash, and (4) a hydrogen injection flash in a 1.25 solar mass star. These simulations have been partially described previously in Meakin [2006], Meakin and Arnett [2007a,b, 2010], Arnett et al. [2009, 2010], Viallet et al. [2011, 2013a,b] and Mocak et al. [2009, 2011]. New data is also included in this document with several new domain and resolution configurations as well as some variations in the physical model such as convection zone depth and driving source term. The long term goal of this work is to aid in the development of more sophisticated models for treating hydrodynamic phenomena (e.g., turbulent convection) in the field of stellar evolution by providing a direct link between 3D simulation data and the mean fields which are modeled by 1D stellar evolution codes. As such, this data can be used to test previously proposed turbulence models found in the literature and sometimes used in stellar modeling. This data can also serve to test basic physical principles for model building and inspire new prescriptions for use in 1D evolution codes.
[ { "created": "Tue, 21 Jan 2014 05:03:22 GMT", "version": "v1" } ]
2014-01-22
[ [ "Mocák", "Miroslav", "" ], [ "Meakin", "Casey", "" ], [ "Viallet", "Maxime", "" ], [ "Arnett", "David", "" ] ]
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Compressible Hydrodynamic Mean-Field Equations in Spherical Geometry and their Application to Turbulent Stellar Convection Data
http://arxiv.org/abs/1401.5176v1
http://arxiv.org/pdf/1401.5176v1.pdf
https://github.com/mmicromegas/PROMPI_DATA
false
false
https://paperswithcode.com/paper/compressible-hydrodynamic-mean-field
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1401.5178
Umer Asgher
Umer Asgher, Fahad Moazzam Dar, Ali Hamza, Abdul Moeed Paracha
Analysis of Increasing Malwares and Cyber Crimes Using Economic Approach
5 pages, Special Issue The Proceeding of International Conference on Soft Computing and Software Engineering 2013 [SCSE 13], San Francisco State University, CA, U.S.A., March 2013
The International Journal of Soft Computing and Software Engineering [JSCSE],2013, Vol. 3, No. 3, e-ISSN: 2251-7545
10.7321/jscse.v3.n3.74
null
cs.CY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The economics of an internet crime has newly developed into a field of controlling black money. This economic approach not only provides estimated technique of analyzing internet crimes but also gives details to analyzers of system dependability and divergence. This paper will highlight on the subject of online crime, which has formed its industry since. It all started from amateur hackers who cracked websites and wrote malicious software in pursuit of fun or achieving limited objectives to professional hacking. In the past days, electronic fraud was main objective but now it has been changed into electronic hacking. This study focuses the issue through an economic analysis of available web forum to deals in malware and private information. The findings of this survey research provide considerable in-depth sight into the functions of malware economy spinning around computer impositions and compromise. In this regard, the survey research paper may benefit particularly computer security officials, the law enforcement agencies, and in general prospective anyone involved in better understanding cybercrime from the offender standpoint.
[ { "created": "Tue, 21 Jan 2014 05:17:18 GMT", "version": "v1" } ]
2014-01-22
[ [ "Asgher", "Umer", "" ], [ "Dar", "Fahad Moazzam", "" ], [ "Hamza", "Ali", "" ], [ "Paracha", "Abdul Moeed", "" ] ]
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1401.5181
Umer Asgher
Fahad Moazzam Dar, Umer Asgher, Daniyal Malik, Emmad Adil, Hassan Shahzad, Anees Ali
Automation of Prosthetic Upper Limbs for Transhumeral Amputees Using Switch-controlled Motors
7 Pages, The International Journal of Soft Computing and Software Engineering [JSCSE], Vol. 3, No. 3, Special Issue The Proceeding of International Conference on Soft Computing and Software Engineering 2013 [SCSE 13], San Francisco State University, CA, U.S.A., March 2013
The International Journal of Soft Computing and Software Engineering [JSCSE], Vol. 3, No. 3, 2013. e-ISSN: 2251-7545
10.7321/jscse.v3.n3.90
e-ISSN: 2251-7545
cs.HC cs.RO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The issues of research required in the field of bio medical engineering and externally-powered prostheses are attracting attention of regulatory bodies and the common people in various parts of the globe. Today, 90 percent of prostheses used are conventional body powered cable-controlled ones which are very uncomfortable to the amputees as fairly large amount of forces and excursions have to be generated by the amputee. Additionally, its amount of rotation is limited. Alternatively, prosthetic limbs driven using electrical motors might deliver added functionality and improved control, accompanied by better cosmesis, however,it could be bulky and costly. Presently existing proposals usually require fewer bodily response and need additional upkeep than the cable operated prosthetic limbs. Due to the motives mentioned, proposal for mechanization of body-powered prostheses, with ease of maintenance and cost in mind, is presented in this paper. The prosthetic upper limb which is being automated is for Transhumeral type of amputees that is amputated from above elbow. The study consists of two main portions: one is lifting mechanism of the limb and the other is gripping mechanism for the hand using switch controls, which is the most cost effective and optimized solution, rather than using complex and expensive myoelectric control signals.
[ { "created": "Tue, 21 Jan 2014 05:26:34 GMT", "version": "v1" } ]
2014-01-22
[ [ "Dar", "Fahad Moazzam", "" ], [ "Asgher", "Umer", "" ], [ "Malik", "Daniyal", "" ], [ "Adil", "Emmad", "" ], [ "Shahzad", "Hassan", "" ], [ "Ali", "Anees", "" ] ]
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1401.5183
Hamdi Al-Jamimi Mr.
Hamdi A. Al-Jamimi and Moataz Ahmed
Transition from Analysis to Software Design: A Review and New Perspective
null
null
null
null
cs.SE
http://creativecommons.org/licenses/by/3.0/
Analysis and design phases are the most crucial part of the software development life-cycle. Reusing the artifacts of these early phases is very beneficial to improve the productivity and software quality. In this paper we analyze the literature on the automatic transformation of artifacts from the problem space (i.e., requirement analysis models) into artifacts in the solution space (i.e., architecture, design and implementation code). The goal is to assess the current state of the art with regard to the ability of automatically reusing previously developed software designs in synthesizing a new design for a given requirement. We surveyed various related areas such as model-driven development and model transformation techniques. Our analysis revealed that this topic has not been satisfactorily covered yet. Accordingly, we propose a framework consists of three stages to address uncovered limitations in current approaches.
[ { "created": "Tue, 21 Jan 2014 05:29:35 GMT", "version": "v1" } ]
2014-01-22
[ [ "Al-Jamimi", "Hamdi A.", "" ], [ "Ahmed", "Moataz", "" ] ]
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1401.5185
Yuta Kaneko
Yuta Kaneko, Zensho Yoshida
Numerical study on a canonized Hamiltonian system representing reduced magnetohydrodynamics and its comparison with two-dimensional Euler system
null
null
10.1063/1.4863982
null
physics.plasm-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Introducing a Clebsch-like parameterization, we have formulated a canonical Hamiltonian system on a symplectic leaf of reduced magnetohydrodynamics. An interesting structure of the equations is in that the Lorentz-force, which is a quadratic nonlinear term in the conventional formulation, appears as a linear term -{\Delta}Q, just representing the current density (Q is a Clebsch variable, and {\Delta} is the two-dimensional Laplacian); omitting this term reduces the system into the two-dimensional Euler vorticity equation of a neutral fluid. A heuristic estimate shows that current sheets grow exponentially (even in a fully nonlinear regime) together with the action variable P that is conjugate to Q. By numerical simulation, the predicted behavior of the canonical variables, yielding exponential growth of current sheets, has been demonstrated.
[ { "created": "Tue, 21 Jan 2014 05:38:33 GMT", "version": "v1" } ]
2015-06-18
[ [ "Kaneko", "Yuta", "" ], [ "Yoshida", "Zensho", "" ] ]
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1401.5186
Tomokatsu Onaga
Tomokatsu Onaga and Shigeru Shinomoto
Bursting transition in a linear self-exciting point process
6 pages, 3 figures
Physical Review E 89 (2014) 042817
10.1103/PhysRevE.89.042817
null
physics.data-an q-bio.NC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Self-exciting point processes describe the manner in which every event facilitates the occurrence of succeeding events. By increasing excitability, the event occurrences start to exhibit bursts even in the absence of external stimuli. We revealed that the transition is uniquely determined by the average number of events added by a single event, $1-1/\sqrt{2} \approx 0.2929$, independently of the temporal excitation profile. We further extended the theory to multi-dimensional processes, to be able to incite or inhibit bursting in networks of agents.
[ { "created": "Tue, 21 Jan 2014 05:42:13 GMT", "version": "v1" } ]
2014-05-01
[ [ "Onaga", "Tomokatsu", "" ], [ "Shinomoto", "Shigeru", "" ] ]
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1401.5187
Asaf Weinstein
Asaf Weinstein and Ehud Weinstein
Inequalities for the Bayes Risk
null
null
null
null
cs.IT math.IT math.ST stat.TH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Several inequalities are presented which, in part, generalize inequalities by Weinstein and Weiss, giving rise to new lower bounds for the Bayes risk under squared error loss.
[ { "created": "Tue, 21 Jan 2014 06:11:57 GMT", "version": "v1" } ]
2014-01-22
[ [ "Weinstein", "Asaf", "" ], [ "Weinstein", "Ehud", "" ] ]
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1401.5191
J\"urgen M\"unch
Jens Heidrich, J\"urgen M\"unch
Goal-Oriented Setup and Usage of Custom-Tailored Software Cockpits
15 pages. The final publication is available at http://link.springer.com/chapter/10.1007%2F978-3-540-69566-0_4
Product-Focused Software Process Improvement, volume 5089 of Lecture Notes in Computer Science, pages 4-18. Springer Berlin Heidelberg, 2008
10.1007/978-3-540-69566-0_4
null
cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Software Cockpits, also known as Software Project Control Centers, support the management and controlling of software and system development projects and provide means for quantitative measurement-based project control. Currently, many companies are developing simple control dashboards that are mainly based on Spreadsheet applications. Alternatively, they use solutions providing a fixed set of project control functionality that cannot be sufficiently customized to their specific needs and goals. Specula is a systematic approach for defining reusable, customizable control components and instantiate them according to different organizational goals and characteristics based on the Quality Improvement Paradigm (QIP) and GQM. This article gives an overview of the Specula approach, including the basic conceptual model, goal-oriented measurement, and the composition of control components based on explicitly stated measurement goals. Related approaches are discussed and the use of Specula as part of industrial case studies is described.
[ { "created": "Tue, 21 Jan 2014 06:21:28 GMT", "version": "v1" } ]
2014-01-22
[ [ "Heidrich", "Jens", "" ], [ "Münch", "Jürgen", "" ] ]
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1401.5194
David Elkouss Coronas
Marco Tomamichel, Jesus Martinez-Mateo, Christoph Pacher, David Elkouss
Fundamental Finite Key Limits for One-Way Information Reconciliation in Quantum Key Distribution
null
Quantum Information Processing (2017) 16:280
10.1007/s11128-017-1709-5
null
quant-ph cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The security of quantum key distribution protocols is guaranteed by the laws of quantum mechanics. However, a precise analysis of the security properties requires tools from both classical cryptography and information theory. Here, we employ recent results in non-asymptotic classical information theory to show that one-way information reconciliation imposes fundamental limitations on the amount of secret key that can be extracted in the finite key regime. In particular, we find that an often used approximation for the information leakage during information reconciliation is not generally valid. We propose an improved approximation that takes into account finite key effects and numerically test it against codes for two probability distributions, that we call binary-binary and binary-Gaussian, that typically appear in quantum key distribution protocols.
[ { "created": "Tue, 21 Jan 2014 06:34:34 GMT", "version": "v1" }, { "created": "Tue, 10 Oct 2017 09:02:15 GMT", "version": "v2" } ]
2017-10-11
[ [ "Tomamichel", "Marco", "" ], [ "Martinez-Mateo", "Jesus", "" ], [ "Pacher", "Christoph", "" ], [ "Elkouss", "David", "" ] ]
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1401.5197
Shenghao Wang
Shenghao Wang, Kai Zhang, Zhili Wang, Kun Gao, Zhao Wu, Peiping Zhu and Ziyu Wu
A user-friendly nano-CT image alignment and 3D reconstruction platform based on LabVIEW
9 pages, 5 figures, 1 chart
2015 Chinese Physics C, 39 (1): 018001
10.1088/1674-1137/39/1/018001
null
cs.CE physics.med-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
X-ray computed tomography at the nanometer scale (nano-CT) offers a wide range of applications in scientific and industrial areas. Here we describe a reliable, user-friendly and fast software package based on LabVIEW that may allow to perform all procedures after the acquisition of raw projection images in order to obtain the inner structure of the investigated sample. A suitable image alignment process to address misalignment problems among image series due to mechanical manufacturing errors, thermal expansion and other external factors has been considered together with a novel fast parallel beam 3D reconstruction procedure, developed ad hoc to perform the tomographic reconstruction. Remarkably improved reconstruction results obtained at the Beijing Synchrotron Radiation Facility after the image calibration confirmed the fundamental role of this image alignment procedure that minimizes unwanted blurs and additional streaking artifacts always present in reconstructed slices. Moreover, this nano-CT image alignment and its associated 3D reconstruction procedure fully based on LabVIEW routines, significantly reduce the data post-processing cycle, thus making faster and easier the activity of the users during experimental runs.
[ { "created": "Tue, 21 Jan 2014 07:01:37 GMT", "version": "v1" }, { "created": "Mon, 17 Feb 2014 06:53:38 GMT", "version": "v2" }, { "created": "Tue, 15 Apr 2014 08:31:25 GMT", "version": "v3" } ]
2015-01-13
[ [ "Wang", "Shenghao", "" ], [ "Zhang", "Kai", "" ], [ "Wang", "Zhili", "" ], [ "Gao", "Kun", "" ], [ "Wu", "Zhao", "" ], [ "Zhu", "Peiping", "" ], [ "Wu", "Ziyu", "" ] ]
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1401.5198
Kushal Ahmed
Kushal Ahmed, Toby Myers, Lian Wen and Abdul Sattar
Detecting Requirements Defects Utilizing A Mathematical Framework for Behavior Engineering
12 pages
The International Journal of Soft Computing and Software Engineering [JSCSE], Vol. 3, No. 3. 2013 (http://www.jscse.com/papers/vol3.no3/vol3.no3.29.pdf)
10.7321/jscse.v3.n3.29
null
cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Behavior Engineering (BE) provides a rigorous way to derive a formal specification of a software system from the requirements written in natural language. Its graphical specification language, Behavior Tree (BT), has been used with success in industry to systematically translate large, complex, and often erroneous requirements into an integrated model of the software system. BE's process, the Behavior Modeling Process (BMP), allows requirements to be translated into individual requirement BTs one at a time, which are then integrated to form a holistic view of the system. The integrated BT then goes through a series of modifications to construct a specification BT, which is used for validation and verification. The BMP also addresses different types of defects in the requirements throughout its process. However, BT itself is a graphical modeling notation, and the types of integration relations, how they correspond to particular issues, how they should be integrated and how to get formal specification have not been clearly defined. As a result, the BMP is informal, and provides guidelines to perform all these tasks on an ad-hoc basis. In this paper, we first introduce a mathematical framework which defines the graphical form of BTs which we use to define the integration relationships of BTs and to formalize the integration strategy of the BMP. We then formulate semi-automated requirements defects detection techniques by utilizing this underlying mathematical framework, which may be extended to formalize the BMP, develop change management framework for it, build techniques for round-trip engineering and so on.
[ { "created": "Tue, 21 Jan 2014 07:06:14 GMT", "version": "v1" } ]
2014-01-22
[ [ "Ahmed", "Kushal", "" ], [ "Myers", "Toby", "" ], [ "Wen", "Lian", "" ], [ "Sattar", "Abdul", "" ] ]
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1401.5200
Houssam Abbas
Houssam Abbas, Bardh Hoxha, Georgios Fainekos, Jyotirmoy V. Deshmukh, James Kapinski, Koichi Ueda
Conformance Testing as Falsification for Cyber-Physical Systems
null
null
null
null
cs.SY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In Model-Based Design of Cyber-Physical Systems (CPS), it is often desirable to develop several models of varying fidelity. Models of different fidelity levels can enable mathematical analysis of the model, control synthesis, faster simulation etc. Furthermore, when (automatically or manually) transitioning from a model to its implementation on an actual computational platform, then again two different versions of the same system are being developed. In all previous cases, it is necessary to define a rigorous notion of conformance between different models and between models and their implementations. This paper argues that conformance should be a measure of distance between systems. Albeit a range of theoretical distance notions exists, a way to compute such distances for industrial size systems and models has not been proposed yet. This paper addresses exactly this problem. A universal notion of conformance as closeness between systems is rigorously defined, and evidence is presented that this implies a number of other application-dependent conformance notions. An algorithm for detecting that two systems are not conformant is then proposed, which uses existing proven tools. A method is also proposed to measure the degree of conformance between two systems. The results are demonstrated on a range of models.
[ { "created": "Tue, 21 Jan 2014 07:17:47 GMT", "version": "v1" }, { "created": "Sat, 31 May 2014 08:34:44 GMT", "version": "v2" } ]
2014-06-03
[ [ "Abbas", "Houssam", "" ], [ "Hoxha", "Bardh", "" ], [ "Fainekos", "Georgios", "" ], [ "Deshmukh", "Jyotirmoy V.", "" ], [ "Kapinski", "James", "" ], [ "Ueda", "Koichi", "" ] ]
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1401.5208
Chen Guo
Chen Guo, Cenzhe Zhu, Teng Tiow Tay
ShAppliT: A Novel Broker-mediated Solution to Generic Application Sharing in a Cluster of Closed Operating Systems
17 pages
International Journal of Soft Computing and Software Engineering Vol. 2, No. 6, 2012
10.7321/jscse.v2.n6.2
null
cs.DC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
With advances in hardware and networking technologies and mass manufacturing, the cost of high end hardware had fall dramatically in recent years. However, software cost still remains high and is the dominant fraction of the overall computing budget. Application sharing is a promising solution to reduce the overall IT cost. Currently software licenses are still based on the number of copies installed. An organization can thus reduce the IT cost if the users are able to remotely access the software that is installed on certain computer servers instead of running the software on every local computer. In this paper, we propose a generic application sharing architecture for users' application sharing in a cluster of closed operating systems such as Microsoft Windows. We also propose a broker-mediated solution where we allow multiple users to access a single user software license on a time multiplex basis through a single logged in user. An application sharing tool called ShAppliT has been introduced and implemented in Microsoft Windows operating system. We evaluated their performance on CPU usage and memory consumption when a computer is hosting multiple concurrent shared application sessions.
[ { "created": "Tue, 21 Jan 2014 07:37:08 GMT", "version": "v1" } ]
2014-01-22
[ [ "Guo", "Chen", "" ], [ "Zhu", "Cenzhe", "" ], [ "Tay", "Teng Tiow", "" ] ]
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1401.5209
Pablo Cristian Tissera
Pablo Cristian Tissera (1), Alicia Castro (1), A. Marcela Printista (1), Emilio Luque (2) ((1) LIDIC-Departamento de Inform\'atica-Universidad Nacional de San Luis Argentina, (2) Departamento de Arquitectura y Sistemas Operativos - Universidad Aut\'onoma de Barcelona)
Simulating Behaviours to face up an Emergency Evacuation
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null
null
431
cs.OH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Computer based models describing pedestrian behavior in an emergency evacuation play a vital role in the development of active strategies that minimize the evacuation time when a closed area must be evacuated. The reference model has a hybrid structure where the dynamics of fire and smoke propagation are modeled by means of Cellular Automata and for simulating people's behavior we are using Intelligent Agents. The model consists of two sub-models, called environmental and pedestrian ones. As part of the pedestrian model, this paper concentrates in a methodology that is able to model some of the frequently observed human's behaviors in evacuation exercises. Each agent will perceive what is happening around, select the options that exist in that context and then it makes a decision that will reflect its ability to cope with an emergency evacuation, called in this work, behavior. We also developed simple exercises where the model is applied to the simulation of an evacuation due to a potential hazard, such as fire, smoke or some kind of collapse.
[ { "created": "Tue, 21 Jan 2014 07:44:26 GMT", "version": "v1" } ]
2014-01-22
[ [ "Tissera", "Pablo Cristian", "" ], [ "Castro", "Alicia", "" ], [ "Printista", "A. Marcela", "" ], [ "Luque", "Emilio", "" ] ]
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1401.5216
Micha{\l} Karpi\'nski
Micha{\l} Karpi\'nski and Maciej Pacut
Multi-GPU parallel memetic algorithm for capacitated vehicle routing problem
This paper has been withdrawn by the author due to crucial error in the experimental evaluation
null
null
null
cs.DC cs.NE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The goal of this paper is to propose and test a new memetic algorithm for the capacitated vehicle routing problem in parallel computing environment. In this paper we consider simple variation of vehicle routing problem in which the only parameter is the capacity of the vehicle and each client only needs one package. We present simple reduction to prove the existence of polynomial-time algorithm for capacity 2. We analyze the efficiency of the algorithm using hierarchical Parallel Random Access Machine (PRAM) model and run experiments with code written in CUDA (for capacities larger than 2).
[ { "created": "Tue, 21 Jan 2014 08:18:20 GMT", "version": "v1" }, { "created": "Mon, 6 Mar 2017 12:27:48 GMT", "version": "v2" } ]
2017-03-07
[ [ "Karpiński", "Michał", "" ], [ "Pacut", "Maciej", "" ] ]
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1401.5221
Hadi Kasiri Mr
Hadi kasiri, hamid reza momeni, Atiyeh Kasiri
Optimal Intelligent Control for Wind Turbulence Rejection in WECS Using ANNs and Genetic Fuzzy Approach
International journal of soft computing & soft engineering 2012
null
10.7321/jscse.v2.n.9.2
null
cs.SY cs.NE
http://creativecommons.org/licenses/by/3.0/
One of the disadvantages in Connection of wind energy conversion systems (WECSs) to transmission networks is plentiful turbulence of wind speed. Therefore effects of this problem must be controlled. Nowadays, pitch-controlled WECSs are increasingly used for variable speed and pitch wind turbines. Megawatt class wind turbines generally turn at variable speed in wind farm. Thus turbine operation must be controlled in order to maximize the conversion efficiency below rated power and reduce loading on the drive-train. Due to random and non-linear nature of the wind turbulence and the ability of Multi-Layer Perceptron (MLP) and Radial Basis Function (RBF) Artificial Neural Networks (ANNs) in the modeling and control of this turbulence, in this study, widespread changes of wind have been perused using MLP and RBF artificial NNs. In addition in this study, a new genetic fuzzy system has been successfully applied to identify disturbance wind in turbine input. Thus output power has been regulated in optimal and nominal range by pitch angle regulation. Consequently, our proposed approaches have regulated output aerodynamic power and torque in the nominal rang.
[ { "created": "Tue, 21 Jan 2014 08:51:48 GMT", "version": "v1" } ]
2014-01-22
[ [ "kasiri", "Hadi", "" ], [ "momeni", "hamid reza", "" ], [ "Kasiri", "Atiyeh", "" ] ]
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1401.5224
Nicola Ivan Giannoccaro
Nicola Ivan Giannoccaro, Giovanni Indiveri, Luigi Spedicato
Least Entropy-Like Approach for Reconstructing L-Shaped Surfaces Using a Rotating Array of Ultrasonic Sensors
15 pages, 15 figures
International Journal of Soft Computing And Software Engineering (JSCSE) e-ISSN: 2251-7545 Vol.2,No.6, 2012 Published online: Jun 6, 2012
10.7321/jscse.v2.n6.1
null
cs.RO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper introduces a new algorithm for accurately reconstructing two smooth orthogonal surfaces by processing ultrasonic data. The proposed technique is based on a preliminary analysis of a waveform energy indicator in order to classify the data as belonging to one of the two flat surfaces. The following minimization of a nonlinear cost function, inspired by the mathematical definition of Gibbs entropy, allows to estimate the plane parameters robustly with respect to the presence of outlying data. These outliers are mainly due to the effect of multiple reflections arising in the surfaces intersection region. The scanning system consists of four inexpensive ultrasonic sensors rotated by means of a precision servo digital motor in order to obtain distance measurements for each orientation. Experimental results are presented and compared with the classic Least Squares Method demonstrating the potentiality of the proposed approach in terms of precision and reliability.
[ { "created": "Tue, 21 Jan 2014 08:53:27 GMT", "version": "v1" } ]
2014-01-22
[ [ "Giannoccaro", "Nicola Ivan", "" ], [ "Indiveri", "Giovanni", "" ], [ "Spedicato", "Luigi", "" ] ]
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1401.5225
J. Rogel-Salazar
J Rogel-Salazar, H A Jim\'enez-Romero, S Ch\'avez-Cerda
Full characterisation of Airy beams under physical principles
9 pages, 8 figures in colour, to appear in PRA
null
10.1103/PhysRevA.89.023807
null
physics.optics quant-ph
http://creativecommons.org/licenses/by-nc-sa/3.0/
The propagation characteristics of Airy beams is investigated and fully described under the traveling waves approach analogous to that used for non-diffracting Bessel beams. This is possible when noticing that Airy functions are in fact Bessel functions of fractional order 1 . We show how physical 3 principles impose restrictions such that the non-diffracting Airy beams cannot be of infinite extent as has been argued, and introduce for the first time quantitative expressions for the maximum transverse and longitudinal extent of Airy beams. We show that under the appropriate physical conditions it is possible to obtain higher-order Airy beams.
[ { "created": "Tue, 21 Jan 2014 08:53:33 GMT", "version": "v1" } ]
2015-06-18
[ [ "Rogel-Salazar", "J", "" ], [ "Jiménez-Romero", "H A", "" ], [ "Chávez-Cerda", "S", "" ] ]
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1401.5226
Nicolas Gillis
Nicolas Gillis
The Why and How of Nonnegative Matrix Factorization
25 pages, 5 figures. Some typos and errors corrected, Section 3.2 reorganized
null
null
In: "Regularization, Optimization, Kernels, and Support Vector Machines", J.A.K. Suykens, M. Signoretto and A. Argyriou (eds), Chapman & Hall/CRC, Machine Learning and Pattern Recognition Series, pp. 257-291, 2014
stat.ML cs.IR cs.LG math.OC
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Nonnegative matrix factorization (NMF) has become a widely used tool for the analysis of high-dimensional data as it automatically extracts sparse and meaningful features from a set of nonnegative data vectors. We first illustrate this property of NMF on three applications, in image processing, text mining and hyperspectral imaging --this is the why. Then we address the problem of solving NMF, which is NP-hard in general. We review some standard NMF algorithms, and also present a recent subclass of NMF problems, referred to as near-separable NMF, that can be solved efficiently (that is, in polynomial time), even in the presence of noise --this is the how. Finally, we briefly describe some problems in mathematics and computer science closely related to NMF via the nonnegative rank.
[ { "created": "Tue, 21 Jan 2014 09:03:12 GMT", "version": "v1" }, { "created": "Fri, 7 Mar 2014 10:32:43 GMT", "version": "v2" } ]
2014-12-10
[ [ "Gillis", "Nicolas", "" ] ]
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The Why and How of Nonnegative Matrix Factorization
http://arxiv.org/abs/1401.5226v2
http://arxiv.org/pdf/1401.5226v2.pdf
https://github.com/nzhinusoftcm/review-on-collaborative-filtering
false
false
https://paperswithcode.com/paper/the-why-and-how-of-nonnegative-matrix
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1401.5230
Yinxiao Xiang
Yinxiao Xiang, Pidong Wang, Wei Cai, Xinzheng Zhang, Cuifeng Ying and Jingjun Xu
Plasmonic Tamm states: second enhancement of light inside the plasmonic waveguide
3 pages, 4 figures
null
10.1364/JOSAB.31.002769
null
physics.optics
http://creativecommons.org/licenses/by/3.0/
A type of Tamm states inside metal-insulator-metal (MIM) waveguides is proposed. An impedance based transfer matrix method is adopted to study and optimize it. With the participation of the plasmonic Tamm states, fields could be enhanced twice: the ffirst is due to the coupling between a normal waveguide and a nanoscaled plasmonic waveguide and the second is due to the strong localization and field enhancement of Tamm states. As shown in our 2D coupling configuration, |E|^2 is enhanced up to 1050 times when 1550 nm light is coupled from an 300 nm Si slab waveguide into an 40 nm MIM waveguide.
[ { "created": "Tue, 21 Jan 2014 09:25:11 GMT", "version": "v1" } ]
2016-10-31
[ [ "Xiang", "Yinxiao", "" ], [ "Wang", "Pidong", "" ], [ "Cai", "Wei", "" ], [ "Zhang", "Xinzheng", "" ], [ "Ying", "Cuifeng", "" ], [ "Xu", "Jingjun", "" ] ]
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1401.5232
Juan Pablo Carbajal
Konstantinos Dermitzakis and Juan Pablo Carbajal
Bio-inspired friction switches: adaptive pulley systems
Conference. First submission, before reviews
Intelligent Robots and Systems (IROS), 2013 IEEE/RSJ International Conference on , vol., no., pp.947,952, 3-7 Nov. 2013
10.1109/IROS.2013.6696464
null
cs.RO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Frictional influences in tendon-driven robotic systems are generally unwanted, with efforts towards minimizing them where possible. In the human hand however, the tendon-pulley system is found to be frictional with a difference between high-loaded static post-eccentric and post-concentric force production of 9-12% of the total output force. This difference can be directly attributed to tendon-pulley friction. Exploiting this phenomenon for robotic and prosthetic applications we can achieve a reduction of actuator size, weight and consequently energy consumption. In this study, we present the design of a bio-inspired friction switch. The adaptive pulley is designed to minimize the influence of frictional forces under low and medium-loading conditions and maximize it under high-loading conditions. This is achieved with a dual-material system that consists of a high-friction silicone substrate and low-friction polished steel pins. The system, designed to switch its frictional properties between the low-loaded and high-loaded conditions, is described and its behavior experimentally validated with respect to the number and spacing of pins. The results validate its intended behavior, making it a viable choice for robotic tendon-driven systems.
[ { "created": "Tue, 21 Jan 2014 09:32:44 GMT", "version": "v1" } ]
2014-01-22
[ [ "Dermitzakis", "Konstantinos", "" ], [ "Carbajal", "Juan Pablo", "" ] ]
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1401.5233
Sendy Phang
Sendy Phang, Ana Vukovic, Hadi Susanto, Trevor M. Benson, and Phillip Sewell
Impact of Dispersive and Saturable Gain/Loss on Bistability of Nonlinear Parity-Time Bragg Gratings
5 pages, 5 figures, submitted to Optics letters
Optics Letters, Vol. 39, Issue 9, pp. 2603-2606 (2014)
10.1364/OL.39.002603
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We report on the impact of realistic gain and loss models on the bistable operation of nonlinear parity-time Bragg gratings. In our model we include both dispersive and saturable gain and show that levels of gain/loss saturation can have significant impact on the bistable operation of a nonlinear PT Bragg grating based on GaAs material. The hysteresis of the nonlinear PT Bragg grating is analyzed for different levels of gain and loss and different saturation levels. We show that high saturation levels can improve the nonlinear operation by reducing the intensity at which the bistability occurs. However when the saturation intensity is low, saturation inhibits the PT characteristics of the grating.
[ { "created": "Tue, 21 Jan 2014 09:33:35 GMT", "version": "v1" }, { "created": "Wed, 26 Mar 2014 13:52:58 GMT", "version": "v2" } ]
2015-01-30
[ [ "Phang", "Sendy", "" ], [ "Vukovic", "Ana", "" ], [ "Susanto", "Hadi", "" ], [ "Benson", "Trevor M.", "" ], [ "Sewell", "Phillip", "" ] ]
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1401.5234
Elodie Leducq
Elodie Leducq
On the third weight of generalized Reed-Muller codes
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null
null
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cs.IT math.IT math.NT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this paper, we study the third weight of generalized Reed-Muller codes. We prove under some restrictive condition that the third weight of generalized Reed-Muller codes depends on the third weight of generalized Reed-Muller codes of small order with two variables. In some cases, we are able to determine the third weight and the third weight codewords of generalized Reed-Muller codes.
[ { "created": "Tue, 21 Jan 2014 09:38:33 GMT", "version": "v1" } ]
2014-01-22
[ [ "Leducq", "Elodie", "" ] ]
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1401.5236
Semseddin Gunduz
Semseddin Gunduz and Aysen Namlu
The Effect Of Online Cooperative Homework On Students' Academic Success
The International Conference on Soft Computing and Software Engineering (SCSE'13)
null
null
null
cs.CY
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this study, the effect of online cooperative learning homework practices on academic success of students is searched. The experience group of the research consists of 58 students from Anadolu University Education Faculty Education of Computer and Instruction Technology Section. Students in A section are taken to traditional method by neutral appointment; those in B section are taken to online homework practice method. In each class consisting of 29 people, it's decided that 14 students prepare their homework individually; the rest 15 students prepare their homework with cooperative as triple groups. It's students' own choice to prepare their homework individually or cooperatively. There has been a success scale at the end of the teaching period. According to research results, there isn't statistically considerable difference between students who attend traditional homework practices and online homework practices. According to research results, there isn't statistically considerable difference between students who attend individual homework practices and cooperative homework practices. The academic success of the students who attend online-based individual homework practices is higher than traditional individual and online based cooperative learning homework practices.
[ { "created": "Tue, 21 Jan 2014 09:43:02 GMT", "version": "v1" } ]
2014-01-22
[ [ "Gunduz", "Semseddin", "" ], [ "Namlu", "Aysen", "" ] ]
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1401.5245
Ayman Bahaa-Eldin
Ayman M Bahaa-Eldeen, Abdel-Moneim A. Wahdan, Hani M. K. Mahdi
Edge detection of binary images using the method of masks
null
Ain Shams University, Faculty of Engineering Scientific Bulletin, Volume 35, Issue 3, pp 349-355, (2000)
null
null
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In this work the method of masks, creating and using of inverted image masks, together with binary operation of image data are used in edge detection of binary images, monochrome images, which yields about 300 times faster than ordinary methods. The method is divided into three stages: Mask construction, Fundamental edge detection, and Edge Construction Comparison with an ordinary method and a fuzzy based method is carried out.
[ { "created": "Tue, 21 Jan 2014 09:57:23 GMT", "version": "v1" } ]
2014-01-22
[ [ "Bahaa-Eldeen", "Ayman M", "" ], [ "Wahdan", "Abdel-Moneim A.", "" ], [ "Mahdi", "Hani M. K.", "" ] ]
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1401.5246
Ayman Bahaa-Eldin
Ayman M. Bahaa-Eldin, A.M.A. Wahdan, H.M.K. Mahdi
Genetic Algorithms and its use with back-propagation network
null
AIN Shams University, Faculty of Engineering Scientific Bulletin, Volume 35, Issue 3, pp 337-348 (2000)
null
null
cs.NE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Genetic algorithms are considered as one of the most efficient search techniques. Although they do not offer an optimal solution, their ability to reach a suitable solution in considerably short time gives them their respectable role in many AI techniques. This work introduces genetic algorithms and describes their characteristics. Then a novel method using genetic algorithm in best training set generation and selection for a back-propagation network is proposed. This work also offers a new extension to the original genetic algorithms
[ { "created": "Tue, 21 Jan 2014 10:01:27 GMT", "version": "v1" } ]
2014-01-22
[ [ "Bahaa-Eldin", "Ayman M.", "" ], [ "Wahdan", "A. M. A.", "" ], [ "Mahdi", "H. M. K.", "" ] ]
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1401.5247
Massimiliano Zanin
Massimiliano Zanin, Pedro A. Sousa, Ernestina Menasalvas
Information content: assessing meso-scale structures in complex networks
Published as: M. Zanin, P. A. Sousa and E. Menasalvas, Information content: assessing meso-scale structures in complex networks EPL 106 (3), (2014) 30001
EPL 106 (3), (2014) 30001
10.1209/0295-5075/106/30001
null
physics.soc-ph cs.SI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We propose a novel measure to assess the presence of meso-scale structures in complex networks. This measure is based on the identification of regular patterns in the adjacency matrix of the network, and on the calculation of the quantity of information lost when pairs of nodes are iteratively merged. We show how this measure is able to quantify several meso-scale structures, like the presence of modularity, bipartite and core-periphery configurations, or motifs. Results corresponding to a large set of real networks are used to validate its ability to detect non-trivial topological patterns.
[ { "created": "Tue, 21 Jan 2014 10:03:41 GMT", "version": "v1" }, { "created": "Sat, 17 May 2014 10:42:57 GMT", "version": "v2" } ]
2015-06-18
[ [ "Zanin", "Massimiliano", "" ], [ "Sousa", "Pedro A.", "" ], [ "Menasalvas", "Ernestina", "" ] ]
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1401.5252
Natasa Adzic
Natasa Adzic and Rudolf Podgornik
Kirkwood-Shumaker interactions and general thermal fluctuation forces
5 pages, to be submitted to EPL
null
null
null
physics.bio-ph cond-mat.soft
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We present an extension of the Kirkwood-Shumaker (KS) theory of proton-fluctuation interactions to situations where the perturbation theory, usually invoked to derive these interactions, fails. In order to do that we formulate a generalized theory of fluctuation interactions with non-linear macroion (surface) free energy term that naturally leads to the long-range KS interactions, but can also be straightforwardly generalized to situations where the perturbation expansion ceases to be valid. It also allows for other surface free energy terms to be treated within the same formalism, enabling us to derive the complete fluctuation interaction with monopolar and dipolar fluctuations included, leading to the KS theory as a limiting form.
[ { "created": "Tue, 21 Jan 2014 10:23:57 GMT", "version": "v1" } ]
2014-01-22
[ [ "Adzic", "Natasa", "" ], [ "Podgornik", "Rudolf", "" ] ]
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1401.5254
Pietro Codara
Pietro Codara, Ottavio M. D'Antona, Vincenzo Marra
Valuations in G\"{o}del Logic, and the Euler Characteristic
15 pages, 1 figure
Journal of Multiple-Valued Logic and Soft Computing 19 (2012) 71-84
null
null
cs.LO cs.DM math.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Using the lattice-theoretic version of the Euler characteristic introduced by V. Klee and G.-C. Rota in the Sixties, we define the Euler characteristic of a formula in G\"{o}del logic (over finitely or infinitely many truth-values). We then prove that the information encoded by the Euler characteristic is classical, i.e. coincides with the analogous notion defined over Boolean logic. Building on this, we define many-valued versions of the Euler characteristic of a formula $\varphi$, and prove that they indeed provide information about the logical status of $\varphi$ in G\"{o}del logic. Specifically, our first main result shows that the many-valued Euler characteristics are invariants that separate many-valued tautologies from non-tautologies. Further, we offer an initial investigation of the linear structure of these generalised characteristics. Our second main result is that the collection of many-valued characteristics forms a linearly independent set in the real vector space of all valuations of G\"{o}del logic over finitely many propositional variables.
[ { "created": "Tue, 21 Jan 2014 10:27:26 GMT", "version": "v1" } ]
2014-01-22
[ [ "Codara", "Pietro", "" ], [ "D'Antona", "Ottavio M.", "" ], [ "Marra", "Vincenzo", "" ] ]
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1401.5258
Farrukh Arslan
Farrukh Arslan
Service Oriented Paradigm for Massive Multiplayer Online Games
null
International Journal of Soft Computing and Software Engineering [JSCSE], Vol. 2, No. 5, pp. 35-47, 2012
10.7321/jscse.v2.n5.4
null
cs.NI cs.DC cs.MM cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
In recent times Massive Multiplayer Online Game has appeared as a computer game that enables hundreds of players from all parts of the world to interact in a game world (common platform) at the same time instance. Current architecture used for MMOGs based on the classic tightly coupled distributed system. While, MMOGs are getting more interactive same time number of interacting users is increasing, classic implementation architecture may raise scalability and interdependence issues. This requires a loosely coupled service oriented architecture to support evolution in MMOG application. Data flow architecture, Event driven architecture and client server architecture are basic date orchestration approaches used by any service oriented architecture. Real time service is hottest issue for service oriented architecture. The basic requirement of any real time service oriented architecture is to ensure the quality of service. In this paper we have proposed a service oriented architecture for massive multiplayer online game and a specific middleware (based on open source DDS) in MMOGs for fulfilling real time constraints.
[ { "created": "Tue, 21 Jan 2014 10:49:01 GMT", "version": "v1" } ]
2014-01-22
[ [ "Arslan", "Farrukh", "" ] ]
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1401.5261
Pietro Codara
Pietro Codara, Ottavio M. D'Antona, Vincenzo Marra
An Analysis of Ruspini Partitions in G\"odel Logic
22 pages
International Journal of Approximate Reasoning 50/6 (2009) 825-836
10.1016/j.ijar.2009.02.007
null
cs.LO math.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
By a Ruspini partition we mean a finite family of fuzzy sets $\{f_1, \ldots, f_n\}$, $f_i : [0,1] \to [0,1]$, such that $\sum_{i=1}^n f_i(x)=1$ for all $x \in [0,1]$, where $[0,1]$ denotes the real unit interval. We analyze such partitions in the language of G\"odel logic. Our first main result identifies the precise degree to which the Ruspini condition is expressible in this language, and yields inter alia a constructive procedure to axiomatize a given Ruspini partition by a theory in G\"odel logic. Our second main result extends this analysis to Ruspini partitions fulfilling the natural additional condition that each $f_i$ has at most one left and one right neighbour, meaning that $\min_{x \in [0,1]}{\{f_{i_1}(x),f_{i_2}(x),f_{i_3}(x)\}}=0$ holds for $i_1\neq i_2\neq i_3$.
[ { "created": "Tue, 21 Jan 2014 11:00:05 GMT", "version": "v1" } ]
2014-01-22
[ [ "Codara", "Pietro", "" ], [ "D'Antona", "Ottavio M.", "" ], [ "Marra", "Vincenzo", "" ] ]
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1401.5265
J\"urgen M\"unch
Adam Trendowicz, Michael Ochs, Axel Wickenkamp, J\"urgen M\"unch, Yasushi Ishigai, Takashi Kawaguchi
An Integrated Approach for Identifying Relevant Factors Influencing Software Development Productivity
15 pages. The final publication is available at http://link.springer.com/chapter/10.1007%2F978-3-540-85279-7_18
Balancing Agility and Formalism in Software Engineering, volume 5082 of Lecture Notes in Computer Science, pages 223-237, Springer Berlin Heidelberg, 2008
10.1007/978-3-540-85279-7_18
null
cs.SE
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Managing software development productivity and effort are key issues in software organizations. Identifying the most relevant factors influencing project performance is essential for implementing business strategies by selecting and adjusting proper improvement activities. There is, however, a large number of potential influencing factors. This paper proposes a novel approach for identifying the most relevant factors influencing software development productivity. The method elicits relevant factors by integrating data analysis and expert judgment approaches by means of a multi-criteria decision support technique. Empirical evaluation of the method in an industrial context has indicated that it delivers a different set of factors compared to individual data- and expert-based factor selection methods. Moreover, application of the integrated method significantly improves the performance of effort estimation in terms of accuracy and precision. Finally, the study did not replicate the observation of similar investigations regarding improved estimation performance on the factor sets reduced by a data-based selection method.
[ { "created": "Tue, 21 Jan 2014 11:08:36 GMT", "version": "v1" } ]
2014-01-22
[ [ "Trendowicz", "Adam", "" ], [ "Ochs", "Michael", "" ], [ "Wickenkamp", "Axel", "" ], [ "Münch", "Jürgen", "" ], [ "Ishigai", "Yasushi", "" ], [ "Kawaguchi", "Takashi", "" ] ]
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1401.5266
Christoph Haase
Christoph Haase
Subclasses of Presburger Arithmetic and the Weak EXP Hierarchy
10 pages, 2 figures
null
10.1145/2603088.2603092
null
cs.LO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
It is shown that for any fixed $i>0$, the $\Sigma_{i+1}$-fragment of Presburger arithmetic, i.e., its restriction to $i+1$ quantifier alternations beginning with an existential quantifier, is complete for $\mathsf{\Sigma}^{\mathsf{EXP}}_{i}$, the $i$-th level of the weak EXP hierarchy, an analogue to the polynomial-time hierarchy residing between $\mathsf{NEXP}$ and $\mathsf{EXPSPACE}$. This result completes the computational complexity landscape for Presburger arithmetic, a line of research which dates back to the seminal work by Fischer & Rabin in 1974. Moreover, we apply some of the techniques developed in the proof of the lower bound in order to establish bounds on sets of naturals definable in the $\Sigma_1$-fragment of Presburger arithmetic: given a $\Sigma_1$-formula $\Phi(x)$, it is shown that the set of non-negative solutions is an ultimately periodic set whose period is at most doubly-exponential and that this bound is tight.
[ { "created": "Tue, 21 Jan 2014 11:13:27 GMT", "version": "v1" }, { "created": "Mon, 12 May 2014 14:26:18 GMT", "version": "v2" } ]
2014-10-01
[ [ "Haase", "Christoph", "" ] ]
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1401.5269
Stephan Mertens
Stephan Mertens
Stable Roommates Problem with Random Preferences
14 pages, 6 figures, 4 algorithms, 1 table; Journal of Statistical Mechanics: Theory and Experiment (2015) P01020
null
10.1088/1742-5468/2015/01/P01020
null
cs.DS cs.CC math.CO
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
The stable roommates problem with $n$ agents has worst case complexity $O(n^2)$ in time and space. Random instances can be solved faster and with less memory, however. We introduce an algorithm that has average time and space complexity $O(n^\frac{3}{2})$ for random instances. We use this algorithm to simulate large instances of the stable roommates problem and to measure the probabilty $p_n$ that a random instance of size $n$ admits a stable matching. Our data supports the conjecture that $p_n = \Theta(n^{-1/4})$.
[ { "created": "Tue, 21 Jan 2014 11:16:51 GMT", "version": "v1" }, { "created": "Wed, 21 Jan 2015 11:54:09 GMT", "version": "v2" } ]
2015-01-22
[ [ "Mertens", "Stephan", "" ] ]
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1401.5271
Anton Babaev
A.A. Babaev, G. Cavoto, S.B. Dabagov
Deflection of proton beams by crystal miscut surface
null
null
null
null
physics.acc-ph
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
First computer experiment results on proton beam deflection by the crystal miscut surface are presented. The phenomenology of proton channeling and quasichanneling has been applied to describe new features of the beam deflection. The analysis predicts efficient beam deflection by the acute crystal end due to repelling miscut potential.
[ { "created": "Tue, 21 Jan 2014 11:22:31 GMT", "version": "v1" } ]
2014-01-22
[ [ "Babaev", "A. A.", "" ], [ "Cavoto", "G.", "" ], [ "Dabagov", "S. B.", "" ] ]
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1401.5272
Ramji Venkataramanan
Ramji Venkataramanan, Sekhar Tatikonda
The Rate-Distortion Function and Excess-Distortion Exponent of Sparse Regression Codes with Optimal Encoding
16 pages. IEEE Transactions on Information Theory
IEEE Transactions on Information Theory, Vol. 63, no. 8, pp. 5228-5243 (August 2017)
10.1109/TIT.2017.2716360
null
cs.IT math.IT math.ST stat.TH
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper studies the performance of sparse regression codes for lossy compression with the squared-error distortion criterion. In a sparse regression code, codewords are linear combinations of subsets of columns of a design matrix. It is shown that with minimum-distance encoding, sparse regression codes achieve the Shannon rate-distortion function for i.i.d. Gaussian sources $R^*(D)$ as well as the optimal excess-distortion exponent. This completes a previous result which showed that $R^*(D)$ and the optimal exponent were achievable for distortions below a certain threshold. The proof of the rate-distortion result is based on the second moment method, a popular technique to show that a non-negative random variable $X$ is strictly positive with high probability. In our context, $X$ is the number of codewords within target distortion $D$ of the source sequence. We first identify the reason behind the failure of the standard second moment method for certain distortions, and illustrate the different failure modes via a stylized example. We then use a refinement of the second moment method to show that $R^*(D)$ is achievable for all distortion values. Finally, the refinement technique is applied to Suen's correlation inequality to prove the achievability of the optimal Gaussian excess-distortion exponent.
[ { "created": "Tue, 21 Jan 2014 11:22:48 GMT", "version": "v1" }, { "created": "Fri, 7 Feb 2014 11:57:57 GMT", "version": "v2" }, { "created": "Tue, 29 Apr 2014 13:43:46 GMT", "version": "v3" }, { "created": "Fri, 18 Dec 2015 19:47:25 GMT", "version": "v4" }, { "created": "Sun, 4 Jun 2017 08:28:03 GMT", "version": "v5" }, { "created": "Mon, 19 Jun 2017 16:15:11 GMT", "version": "v6" } ]
2017-07-17
[ [ "Venkataramanan", "Ramji", "" ], [ "Tatikonda", "Sekhar", "" ] ]
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1401.5277
Sergey Goncharov
Sergey Goncharov and Stefan Milius and Alexandra Silva
Towards a Uniform Theory of Effectful State Machines
final version accepted by TOCL
ACM Transactions on Computational Logic, March 2020, Article No.: 23, Volume 21, Issue 3
10.1145/3372880
null
cs.LO cs.FL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Using recent developments in coalgebraic and monad-based semantics, we present a uniform study of various notions of machines, e.g. finite state machines, multi-stack machines, Turing machines, valence automata, and weighted automata. They are instances of Jacobs' notion of a T-automaton, where T is a monad. We show that the generic language semantics for T-automata correctly instantiates the usual language semantics for a number of known classes of machines/languages, including regular, context-free, recursively-enumerable and various subclasses of context free languages (e.g. deterministic and real-time ones). Moreover, our approach provides new generic techniques for studying the expressivity power of various machine-based models.
[ { "created": "Tue, 21 Jan 2014 11:32:44 GMT", "version": "v1" }, { "created": "Tue, 18 Feb 2014 18:41:01 GMT", "version": "v2" }, { "created": "Mon, 28 Apr 2014 07:50:07 GMT", "version": "v3" }, { "created": "Fri, 12 Oct 2018 08:16:36 GMT", "version": "v4" }, { "created": "Thu, 14 Nov 2019 18:54:43 GMT", "version": "v5" }, { "created": "Tue, 17 Mar 2020 16:21:38 GMT", "version": "v6" } ]
2020-03-18
[ [ "Goncharov", "Sergey", "" ], [ "Milius", "Stefan", "" ], [ "Silva", "Alexandra", "" ] ]
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1401.5287
Antonios Kalampakas
Antonios Kalampakas
k-Colorability is Graph Automaton Recognizable
null
null
10.29020/nybg.ejpam.v16i1.4629
null
cs.FL cs.DM
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Automata operating on general graphs have been introduced by virtue of graphoids. In this paper we construct a graph automaton that recognizes $k$-colorable graphs.
[ { "created": "Tue, 21 Jan 2014 12:17:53 GMT", "version": "v1" } ]
2023-02-01
[ [ "Kalampakas", "Antonios", "" ] ]
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1401.5289
Stanislav Simeonov
Stanislav Simeonov, Neli Simeonova
Graphical Interface for Visually Impaired People Based on Bi-stable Solenoids
4 pages, 5 figures, The International Journal of Soft Computing and Software Engineering, ISSN:2251-7545
null
10.7321/jscse
null
cs.HC
http://creativecommons.org/licenses/by-nc-sa/3.0/
In this paper a concept for hardware realization of graphic tactile display for visually impaired peoples is presented. For realization of tactile actuators bi-stable, solenoids and PIC based control board are used. The selected algorithm for series activation of each row of display allows using minimal number of active components to set and reset the solenoids. Finally, a program algorithm of control board is discussed. The project is funded by Bulgarian National Science Fund NSF Grant D ID 02 14, 2009 2013
[ { "created": "Tue, 21 Jan 2014 12:21:48 GMT", "version": "v1" } ]
2014-01-22
[ [ "Simeonov", "Stanislav", "" ], [ "Simeonova", "Neli", "" ] ]
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1401.5292
Etienne Payet
\'Etienne Payet, Fred Mesnard, Fausto Spoto
Non-Termination Analysis of Java Bytecode
17 pages, technical report written in May 2012
null
null
null
cs.PL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We introduce a fully automated static analysis that takes a sequential Java bytecode program P as input and attempts to prove that there exists an infinite execution of P. The technique consists in compiling P into a constraint logic program P_CLP and in proving non-termination of P_CLP; when P consists of instructions that are exactly compiled into constraints, the non-termination of P_CLP entails that of P. Our approach can handle method calls; to the best of our knowledge, it is the first static approach for Java bytecode able to prove the existence of infinite recursions. We have implemented our technique inside the Julia analyser. We have compared the results of Julia on a set of 113 programs with those provided by AProVE and Invel, the only freely usable non-termination analysers comparable to ours that we are aware of. Only Julia could detect non-termination due to infinite recursion.
[ { "created": "Tue, 21 Jan 2014 12:35:09 GMT", "version": "v1" } ]
2014-01-22
[ [ "Payet", "Étienne", "" ], [ "Mesnard", "Fred", "" ], [ "Spoto", "Fausto", "" ] ]
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1401.5297
Gergeky Bicz\'ok
Gergely Biczok, Santiago Diez Martinez, Thomas Jelle, John Krogstie
Navigating MazeMap: indoor human mobility, spatio-logical ties and future potential
6 pages, accepted at PerMoby Workshop at IEEE PerCom 2014
null
10.1109/PerComW.2014.6815215
null
cs.SY cs.NI cs.SI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Global navigation systems and location-based services have found their way into our daily lives. Recently, indoor positioning techniques have also been proposed, and there are several live or trial systems already operating. In this paper, we present insights from MazeMap, the first live indoor/outdoor positioning and navigation system deployed at a large university campus in Norway. Our main contribution is a measurement case study; we show the spatial and temporal distribution of MazeMap geo-location and wayfinding requests, construct the aggregated human mobility map of the campus and find strong logical ties between different locations. On one hand, our findings are specific to the venue; on the other hand, the nature of available data and insights coupled with our discussion on potential usage scenarios for indoor positioning and location-based services predict a successful future for these systems and applications.
[ { "created": "Tue, 21 Jan 2014 12:57:08 GMT", "version": "v1" } ]
2016-11-17
[ [ "Biczok", "Gergely", "" ], [ "Martinez", "Santiago Diez", "" ], [ "Jelle", "Thomas", "" ], [ "Krogstie", "John", "" ] ]
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1401.5300
Yanqing Wang
Yanqing Wang, Chong Wang, Xiaojie Li, Sijing Yun, Minjing Song
How are identifiers named in open source software? About popularity and consistency
10 pages, 3 figures, 5 tables
International Journal of Computer and Information Technology, vol 3, no 3, 2014
null
null
cs.SE cs.PL
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
With the rapid increasing of software project size and maintenance cost, adherence to coding standards especially by managing identifier naming, is attracting a pressing concern from both computer science educators and software managers. Software developers mainly use identifier names to represent the knowledge recorded in source code. However, the popularity and adoption consistency of identifier naming conventions have not been revealed yet in this field. Taking forty-eight popular open source projects written in three top-ranking programming languages Java, C and C++ as examples, an identifier extraction tool based on regular expression matching is developed. In the subsequent investigation, some interesting findings are obtained. For the identifier naming popularity, it is found that Camel and Pascal naming conventions are leading the road while Hungarian notation is vanishing. For the identifier naming consistency, we have found that the projects written in Java have a much better performance than those written in C and C++. Finally, academia and software industry are urged to adopt the most popular naming conventions consistently in their practices so as to lead the identifier naming to a standard, unified and high-quality road.
[ { "created": "Tue, 21 Jan 2014 13:02:36 GMT", "version": "v1" }, { "created": "Sat, 31 May 2014 05:49:41 GMT", "version": "v2" } ]
2014-06-03
[ [ "Wang", "Yanqing", "" ], [ "Wang", "Chong", "" ], [ "Li", "Xiaojie", "" ], [ "Yun", "Sijing", "" ], [ "Song", "Minjing", "" ] ]
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1401.5305
Qiutao Zhuang
Qiutao Zhuang, Xiao Ma and Aleksander Kavcic
Bounds on the ML Decoding Error Probability of RS-Coded Modulation over AWGN Channels
arXiv admin note: text overlap with arXiv:1309.1555 by other authors
null
null
null
cs.IT math.IT
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
This paper is concerned with bounds on the maximum-likelihood (ML) decoding error probability of Reed-Solomon (RS) codes over additive white Gaussian noise (AWGN) channels. To resolve the difficulty caused by the dependence of the Euclidean distance spectrum on the way of signal mapping, we propose to use random mapping, resulting in an ensemble of RS-coded modulation (RS-CM) systems. For this ensemble of RS-CM systems, analytic bounds are derived, which can be evaluated from the known (symbol-level) Hamming distance spectrum. Also presented in this paper are simulation-based bounds, which are applicable to any specific RS-CM system and can be evaluated by the aid of a list decoding (in the Euclidean space) algorithm. The simulation-based bounds do not need distance spectrum and are numerically tight for short RS codes in the regime where the word error rate (WER) is not too low. Numerical comparison results are relevant in at least three aspects. First, in the short code length regime, RS-CM using BPSK modulation with random mapping has a better performance than binary random linear codes. Second, RS-CM with random mapping (time varying) can have a better performance than with specific mapping. Third, numerical results show that the recently proposed Chase-type decoding algorithm is essentially the ML decoding algorithm for short RS codes.
[ { "created": "Tue, 21 Jan 2014 13:08:47 GMT", "version": "v1" } ]
2014-01-22
[ [ "Zhuang", "Qiutao", "" ], [ "Ma", "Xiao", "" ], [ "Kavcic", "Aleksander", "" ] ]
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1401.5306
Anthony Marcus Ph.D.
Anthony Marcus, Ionut Cardei, Borko Furht, Osman Salem and Ahmed Mehaoua
A Mobile Device Prototype Application for the Detection and Prediction of Node Faults in Wireless Sensor Networks
null
null
null
null
cs.NI
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Various implementations of wireless sensor networks (i.e. personal area-, wireless body area- networks) are prone to node and network failures by such characteristics as limited node energy resources and hardware damage incurred from their surrounding environment (i.e. flooding, forest fires, a patient falling). This may jeopardize their reliability to act as early warning systems, monitoring systems for patients and athletes, and industrial and environmental observation networks. Following the current trend and widespread use of hand held, mobile communication devices, we outline an application architecture designed to detect and predict faulty nodes in wireless sensor networks. Furthermore, we implement our design as a proof of concept prototype for Android-based smartphones, which may be extended to develop other applications used for monitoring networked wireless personal area and body sensors used in other capacities. We have conducted several preliminary experiments to demonstrate the use of our design, which is capable of monitoring networks of wireless sensor devices and predicting node faults based on several localized metrics. As attributes of such networks may change over time, any models generated when the application is initialized must be updated periodically such that the applied machine learning algorithm maintains high levels of both accuracy and precision. The application is designed to discover node faults and, once identified, alert the user so that appropriate action may be taken.
[ { "created": "Tue, 21 Jan 2014 13:10:22 GMT", "version": "v1" } ]
2014-01-22
[ [ "Marcus", "Anthony", "" ], [ "Cardei", "Ionut", "" ], [ "Furht", "Borko", "" ], [ "Salem", "Osman", "" ], [ "Mehaoua", "Ahmed", "" ] ]
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1401.5309
Francesco Picano
Stefano Olivieri, Francesco Picano, Gaetano Sardina, Daniele Iudicone, Luca Brandt
The effect of the Basset history force on particle clustering in Homogeneous and Isotropic Turbulence
null
Physics of Fluids 26 (04), 041704, 2014
10.1063/1.4871480
null
physics.flu-dyn
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
We study the effect of the Basset history force on the dynamics of small particles transported in homogeneous and isotropic turbulence and show that this term, often neglected in previous numerical studies, reduces the small-scale clustering typical of inertial particles. The contribution of this force to the total particle acceleration is, on average, responsible for about 10% of the total acceleration and particularly relevant during rare strong events. At moderate density ratios, i.e. sand or metal powder in water, its presence alters the balance of forces determining the particle acceleration.
[ { "created": "Tue, 21 Jan 2014 13:22:53 GMT", "version": "v1" }, { "created": "Thu, 3 Apr 2014 14:29:08 GMT", "version": "v2" }, { "created": "Tue, 20 May 2014 10:12:57 GMT", "version": "v3" } ]
2014-05-21
[ [ "Olivieri", "Stefano", "" ], [ "Picano", "Francesco", "" ], [ "Sardina", "Gaetano", "" ], [ "Iudicone", "Daniele", "" ], [ "Brandt", "Luca", "" ] ]
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1401.5310
Qiangsheng Huang
Qiangsheng Huang, Jianxin Cheng, Liu Liu, and Sailing He
Ultracompact Adiabatic Bi-sectional Tapered Coupler for the Si/III-V Heterogeneous Integration
7 pages, 6 figures
null
null
null
physics.optics
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
An ultracompact bi-sectional adiabatic tapered coupler, which is suitable for an adiabatic mode transformation between a common single mode SOI wire waveguide and a Si/III-V hybrid waveguide, are proposed for Si/III-V heterogeneous integration. Since the bi-sectional tapered coupler mimics a semi-3D taper and avoids exciting the unwanted high-order modes in the thick p-InP cladding layer (which is removed in the first tapered section), the length of the adiabatic mode coupler can be dramatically shortened. Taking into account the mask design and the fabrication tolerance, we design the tapered structure only in the III/V structure, while keeping the SOI wire waveguide straight. In the proposed structure, the length of the bi-sectional tapered coupler can be 9.5 {\mu}m with a large fundamental mode-coupling ratio (over 95%) in a bandwidth of ~100 nm, and provides 100 nm tolerance to misalignment, even when the BCB layer is as thick as 50 nm.
[ { "created": "Tue, 21 Jan 2014 13:23:24 GMT", "version": "v1" } ]
2014-01-22
[ [ "Huang", "Qiangsheng", "" ], [ "Cheng", "Jianxin", "" ], [ "Liu", "Liu", "" ], [ "He", "Sailing", "" ] ]
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1401.5311
Dacheng Tao
Changxing Ding, Jonghyun Choi, Dacheng Tao and Larry S. Davis
Multi-Directional Multi-Level Dual-Cross Patterns for Robust Face Recognition
accepted version to IEEE TPAMI
null
10.1109/TPAMI.2015.2462338
null
cs.CV
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
To perform unconstrained face recognition robust to variations in illumination, pose and expression, this paper presents a new scheme to extract "Multi-Directional Multi-Level Dual-Cross Patterns" (MDML-DCPs) from face images. Specifically, the MDMLDCPs scheme exploits the first derivative of Gaussian operator to reduce the impact of differences in illumination and then computes the DCP feature at both the holistic and component levels. DCP is a novel face image descriptor inspired by the unique textural structure of human faces. It is computationally efficient and only doubles the cost of computing local binary patterns, yet is extremely robust to pose and expression variations. MDML-DCPs comprehensively yet efficiently encodes the invariant characteristics of a face image from multiple levels into patterns that are highly discriminative of inter-personal differences but robust to intra-personal variations. Experimental results on the FERET, CAS-PERL-R1, FRGC 2.0, and LFW databases indicate that DCP outperforms the state-of-the-art local descriptors (e.g. LBP, LTP, LPQ, POEM, tLBP, and LGXP) for both face identification and face verification tasks. More impressively, the best performance is achieved on the challenging LFW and FRGC 2.0 databases by deploying MDML-DCPs in a simple recognition scheme.
[ { "created": "Tue, 21 Jan 2014 13:24:16 GMT", "version": "v1" }, { "created": "Thu, 6 Aug 2015 02:28:49 GMT", "version": "v2" } ]
2015-08-07
[ [ "Ding", "Changxing", "" ], [ "Choi", "Jonghyun", "" ], [ "Tao", "Dacheng", "" ], [ "Davis", "Larry S.", "" ] ]
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Multi-Directional Multi-Level Dual-Cross Patterns for Robust Face Recognition
https://arxiv.org/abs/1401.5311v2
https://arxiv.org/pdf/1401.5311v2.pdf
https://github.com/ppolon/dcp
true
false
https://paperswithcode.com/paper/multi-directional-multi-level-dual-cross
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