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Consulteu Documents de Congressos per autor "Universitat de Vic. Escola Politècnica Superior"

Consulteu Documents de Congressos per autor "Universitat de Vic. Escola Politècnica Superior"

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  • 2-Dimensional invariant tori for the spatial isosceles 3-body problem
    Corbera Subirana, Montserrat; Llibre, Jaume (World Scientific Publishing, 2000)
    We consider the circular Sitnikov problem as a special case of the restricted spatial isosceles 3-body problem. In appropriate coordinates we show the existence of 2-dimensional invariant tori that are formed by union of ...
  • A Canonical Genetic Algorithm for Blind Inversion of Linear Channels
    Rojas, Fernando; Solé-Casals, Jordi; Monte-Moreno, Enric; Puntonet, Carlos G.; Prieto, Alberto (Springer, 2006)
    It is well known the relationship between source separation and blind deconvolution: If a filtered version of an unknown i.i.d. signal is observed, temporal independence between samples can be used to retrieve the original ...
  • A family of fast walsh hadamard algorithms with identical sparse matrix factorization
    Martí i Puig, Pere (IEEE, 2006)
    In this letter, we present a family of fast Walsh Hadamard transform algorithms that have an identical and iterative stage factorization. We show the transform factorization in terms of identical sparse matrices that ...
  • A fast OFDM-CDMA user demultiplexing architecture
    Martí i Puig, Pere; Sala Álvarez, J. (IEEE, 2000)
    A fast algorithm based on a butterfly structure is presented that demultiplexes the symbols of a particular type of MC-MA (Multi-Carrier Multiple-Access) modulation previously proposed for indoor radio communications ...
  • A morphodynamic mechanism for transverse bars in the nearshore
    Caballeria, Miquel; Falqués, Albert; Coco, G.; Huntley, D.A. (American Society of Civil Engineers, 2001)
    Sand bars which are normal to the coastline have been described on sandy beaches Irom low to moderate wave energy (Niedoroda and Tanner, 1979; Konicki and Holman, 2000). A generating mechanism lor such bars is here proposed ...
  • A Preliminary Review of Behavioural Biometrics for Health Monitoring in the Elderly
    Solé-Casals, Jordi; Vancea, Mihaela; March Amengual, Jaume Miquel (2014)
    This article explores the potential of ICT-based biometrics for monitoring the health status of the elderly people. It departs from specific ageing and biometric traits to then focus on behavioural biometric traits like ...
  • A recursive approach to Multiscalar Data Interpolation of sparsely sampled sea surface measurements at different spatial resolutions
    Reig Bolaño, Ramon; García Ladona, Emili; Parisi Baradad, Vicenç; Martí i Puig, Pere (IEEE, 2008)
    Abstract- In many oceanographic studies there is a need to reconstruct a signal from a set of sparse measurements. We propose an algorithm to iteratively approximate the intermediate values between irregularly sampled ...
  • A Robust Multiple Feature Approach To Endpoint Detection In Car Environment Based On Advanced Classifiers
    Comas, C.; Monte-Moreno, Enric; Solé-Casals, Jordi (Springer, 2005)
    In this paper we propose an endpoint detection system based on the use of several features extracted from each speech frame, followed by a robust classifier (i.e Adaboost and Bagging of decision trees, and a multilayer ...
  • A Simple Approximation for Fast Nonlinear Deconvolution
    Solé-Casals, Jordi; Caiafa, Cesar F. (Springer, 2011)
    When dealing with nonlinear blind deconvolution, complex mathematical estimations must be done giving as a result very slow algorithms. This is the case, for example, in speech processing or in microarray data analysis. ...
  • A(-infinity)-interpolation in the ball
    Massaneda Clares, Xavier (Cambridge University Press, 1998)
    We give a necessary and sufficient condition for a sequence [ak}k in the unit ball of C° to be interpolating for the class A~°° of holomorphic functions with polynomial growth. The condition, which goes along the lines ...
  • Adaptive Smoothing Applied to fMRI Data
    Bartés i Serrallonga, Manel; Serra Grabulosa, Josep M.; Adan, Ana; Falcón, Carles; Bargalló, Núria; Solé-Casals, Jordi (SciTePress - Science and Technology Publications, 2012)
    One problem of fMRI images is that they include some noise coming from many other sources like the heart beat, breathing and head motion artifacts. All these sources degrade the data and can cause wrong results in the ...
  • Algoritmos interactivos para la separación de fuentes y deconvolución de canal mediante Java
    Jiménez Reifs, David; Solé-Casals, Jordi; Jutten, Christian (2000)
    El objetivo de estos programas es crear una herramienta que nos permita, de una manera fácil, entender mejor la separación de fuentes y la deconvolución de canal . Por eso se presenta el diseño, mediante Java, de una ...
  • Alzheimer disease diagnosis based on automatic spontaneous speech analysis
    Lopez-de-Ipiña, Karmele; Alonso, Jesús B.; Solé-Casals, Jordi; Barroso, Nora; Faundez-Zanuy, Marcos; Ecay-Torres, Miriam; Travieso, Carlos M.; Ezeiza, Aitzol; Estanga, A. (SciTePress - Science and Technology Publications, 2012)
    Alzheimer’s disease (AD) is the most prevalent form of progressive degenerative dementia and it has a high socio-economic impact in Western countries, therefore is one of the most active research areas today. Its diagnosis ...
  • Alzheimer Disease Diagnosis based on Automatic Spontaneous Speech Analysis
    Lopez-de-Ipiña, Karmele; Alonso, Jesús B.; Solé-Casals, Jordi; Barroso, Nora; Faundez-Zanuy, Marcos; Ecay-Torres, Miriam; Travieso, Carlos M.; Ezeiza, Aitzol; Estanga, A. (2013)
    Alzheimer’s disease (AD) is the most prevalent form of progressive degenerative dementia and it has a high socio-economic impact in Western countries, therefore is one of the most active research areas today. Its diagnosis ...
  • Anisotropic low-temperature magnetoresistivity in the normal state of L2−xCexCuO4 single crystals
    Crusellas Font, M. Àngels; Fontcuberta, J.; Piñol, S. (Elsevier, 1994)
    We report in-plane ρab(T, H) and c-axis ρc(T, H) electrical magnetoresistivity measurements on several L2−x CexCuO4 (L=Pr, Sm, Nd) superconducting single crystals. It is found that in the normal state both resistivities ...
  • Applications of Cumulants in Speech Processing
    Zaiats, Vladimir; Solé-Casals, Jordi; Martí i Puig, Pere; Reig Bolaño, Ramon (Springer, 2010)
    This paper analyzes applications of cumulant analysis in speech processing. The main focus is made on an integral representation for cUl1luJants using integrals involving cyclic products of kernels. These integrals serve ...
  • Automatic detection of laryngeal pathologies in running speech based on the HMM transformation of the nonlinear dynamics
    Travieso, Carlos M.; Alonso, Jesús B.; Orozco-Arroyave, J.R.; Solé-Casals, Jordi; Gallego Jutglà, Esteve (Springer, 2013)
    This work describes a novel system for characterizing Laryngeal Pathologies using nonlinear dynamics, considering different complexity measures that are mainly based on the analysis of the time delay embedded space. The ...
  • Automatic Recognition of Leaves by Shape Detection Pre-Processing with Ica
    Solé-Casals, Jordi; Travieso, Carlos M.; Ferrer, Miguel A.; Alonso, Jesús B.; Briceno, Juan Carlos (Springer, 2009)
    In this work we present a simulation of a recognition process with perimeter characterization of a simple plant leaves as a unique discriminating parameter. Data coding allowing for independence of leaves size and orientation ...
  • Blind channel deconvolution of real world signals using source separation techniques
    Solé-Casals, Jordi; Monte-Moreno, Enric (Springer, 2005)
    In this paper we present a method for blind deconvolution of linear channels based on source separation techniques, for real word signals. This technique applied to blind deconvolution problems is based in exploiting ...
  • Blind Inversion of Wiener System using a minimization-projection (MP) approach
    Babaie-Zadeh, Massoud; Solé-Casals, Jordi; Jutten, Christian (2003)
    In this paper, a new algorithm for blind inversion of Wiener systems is presented. The algorithm is based on minimization of mutual information of the output samples. This minimization is done through a Minimization-Projection ...

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