Random planar graphs and the London street networkIn this paper we analyse the street network of London both in its primary and dual representation. To understand its properties, we consider three idealised models based on a grid, a static random…A. P. Masucci, D. Smith, A. Crooks et al.·Mar 31, 2009SaveLearn
Methods for detection and characterization of signals in noisy data with the Hilbert-Huang TransformThe Hilbert-Huang Transform is a novel, adaptive approach to time series analysis that does not make assumptions about the data form. Its adaptive, local character allows the decomposition of…Alexander Stroeer, John K. Cannizzo, Jordan B. Camp et al.·Mar 26, 2009SaveLearn
Nonparametric estimation of the heterogeneity of a random medium using Compound Poisson Process modeling of wave multiple scatteringIn this paper, we present a nonparametric method to estimate the heterogeneity of a random medium from the angular distribution of intensity transmitted through a slab of random material. Our…Nicolas Le Bihan, Ludovic Margerin·Mar 26, 2009SaveLearn
Generalised cascadesIn this manuscript we give thought to the aftermath on the stable probability density function when standard multiplicative cascades are generalised cascades based on the q-product of Borges that…Silvio M. Duarte Queiros·Mar 20, 2009SaveLearn
Detecting network communities by propagating labels under constraintsWe investigate the recently proposed label-propagation algorithm (LPA) for identifying network communities. We reformulate the LPA as an equivalent optimization problem, giving an objective function…Michael J. Barber, John W. Clark·Mar 18, 2009SaveLearn
Limits of Declustering Methods for Disentangling Exogenous from Endogenous Events in Time Series with Foreshocks, Main shocks and AftershocksMany time series in natural and social sciences can be seen as resulting from an interplay between exogenous influences and an endogenous organization. We use a simple (ETAS) model of events…D. Sornette, S. Utkin·Mar 18, 2009SaveLearn
Joint Bayesian endmember extraction and linear unmixing for hyperspectral imageryThis paper studies a fully Bayesian algorithm for endmember extraction and abundance estimation for hyperspectral imagery. Each pixel of the hyperspectral image is decomposed as a linear combination…Nicolas Dobigeon, Said Moussaoui, Martial Coulon et al.·Mar 17, 2009SaveLearn
On the SIRs (Signal-to-Interference-Ratio) in Discrete-Time Autonomous Linear NetworksIn this letter, we improve the results in [5] by relaxing the symmetry assumption and also taking the noise term into account. The author examines two discrete-time autonomous linear systems whose…Zekeriya Uykan·Mar 13, 2009SaveLearn
Structure of shells in complex networksIn a network, we define shell as the set of nodes at distance with respect to a given node and define r as the fraction of nodes outside shell . In a transport process,…Jia Shao, Sergey V. Buldyrev, Lidia A. Braunstein et al.·Mar 11, 2009SaveLearn
The Dynamics of EEG EntropyEEG time series are analyzed using the diffusion entropy method. The resulting EEG entropy manifests short-time scaling, asymptotic saturation and an attenuated alpha-rhythm modulation. These…M. Ignaccolo, M. Latka, W. Jernajczyk et al.·Mar 5, 2009SaveLearn
Waiting time dynamics of priority-queue networksWe study the dynamics of priority-queue networks, generalizations of the binary interacting priority queue model introduced by Oliveira and Vazquez [Physica A 388, 187 (2009)]. We found that…Byungjoon Min, K. -I. Goh, I. -M. Kim·Mar 4, 2009SaveLearn
Breakthrough in Interval Data Fitting II. From Ranges to Means and Standard DeviationsInterval analysis, when applied to the so called problem of experimental data fitting, appears to be still in its infancy. Sometimes, partly because of the unrivaled reliability of interval methods,…Marek W. Gutowski·Mar 2, 2009SaveLearn
Breakthrough in Interval Data Fitting I. The Role of Hausdorff DistanceThis is the first of two papers describing the process of fitting experimental data under interval uncertainty. Here I present the methodology, designed from the very beginning as an…Marek W. Gutowski·Mar 2, 2009SaveLearn
A data mining algorithm for automated characterisation of fluctuations in multichannel timeseriesWe present a data mining technique for the analysis of multichannel oscillatory timeseries data and show an application using poloidal arrays of magnetic sensors installed in the H-1 heliac. The…D. G. Pretty, B. D. Blackwell·Feb 25, 2009SaveLearn
Ultimate "SIR" in Autonomous Linear Networks with Symmetric Weight Matrices, and Its Use to Stabilize the Network - A Hopfield-like networkIn this paper, we present and analyse two Hopfield-like nonlinear networks, in continuous-time and discrete-time respectively. The proposed network is based on an autonomous linear system with a…Zekeriya Uykan·Feb 23, 2009SaveLearn
Analysis of "SIR" ("Signal"-to-"Interference"-Ratio) in Discrete-Time Autonomous Linear Networks with Symmetric Weight MatricesIt's well-known that in a traditional discrete-time autonomous linear systems, the eigenvalues of the weigth (system) matrix solely determine the stability of the system. If the spectral radius…Zekeriya Uykan·Feb 23, 2009SaveLearn
The relativity of theoryA general information-theoretic framework for deriving physical laws is presented and a principle of informational physics is enunciated within its context. Existing approaches intended to derive…Nisheeth Srivastava·Feb 19, 2009SaveLearn
From Sigmoid Power Control Algorithm to Hopfield-like Neural Networks: "SIR"-Balancing Sigmoid-Based Networks- Part II: Discrete TimeIn the first part in [12], we present and analyse a Sigmoid-based "Signal-to-Interference Ratio, (SIR)" balancing dynamic network, called Sgm"SIR"NN, which exhibits similar properties…Zekeriya Uykan·Feb 15, 2009SaveLearn
From Sigmoid Power Control Algorithm to Hopfield-like Neural Networks: "SIR" ("Signal"-to-"Interference"-Ratio)-Balancing Sigmoid-Based Networks- Part I: Continuous TimeContinuous-time Hopfield network has been an important focus of research area since 1980s whose applications vary from image restoration to combinatorial optimization from control engineering to…Zekeriya Uykan·Feb 15, 2009SaveLearn
How often does theory match experiment?In every sphere of science, theories make predictions and experiments validate them. However, common experience suggests that theoretically predicted exact magnitude for a parameter, constitute a…Anirban Banerji·Feb 12, 2009SaveLearn
Properties and application of the form A· exp(-(x-c)2/(a(x-c)+2b2)) for investigation of ultra high energy cascadesThe form A· exp(-(x-c)2 /(a(x-c)+2b2)) is an asymmetric distribution intermediate between the normal and exponential distributions. Some specific properties of the form are presented and…A. A. Kirillov, I. A. Kirillov·Feb 12, 2009SaveLearn
About the parabolic relation existing between the skewness and the kurtosis in time series of experimental dataIn this work we investigate the origin of the parabolic relation between skewness and kurtosis often encountered in the analysis of experimental time-series. We argue that the numerical values of the…F. Sattin, M. Agostini, R. Cavazzana et al.·Feb 12, 2009SaveLearn
Dynamics of EEG Entropy: beyond signal plus noiseEEG time series are analyzed using the diffusion entropy method. The resulting EEG entropy manifests short-time scaling, asymptotic saturation and an attenuated alpha-rhythm modulation. These…M. Ignaccolo, M. Latka, W. Jernajczyk et al.·Feb 6, 2009SaveLearn
Bridge Bounding: A Local Approach for Efficient Community Discovery in Complex NetworksThe increasing importance of Web 2.0 applications during the last years has created significant interest in tools for analyzing and describing collective user activities and emerging phenomena within…Symeon Papadopoulos, Andre Skusa, Athena Vakali et al.·Feb 5, 2009SaveLearn
Detrended fluctuation analysis of power-law-correlated sequences with random noisesImprovement in time resolution sometimes introduces short-range random noises into temporal data sequences. These noises affect the results of power-spectrum analyses and the Detrended Fluctuation…Shin-ichi Tadaki·Feb 4, 2009SaveLearn