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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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  • ICA as a preprocessing technique for classification
    Sánchez Poblador, Víctor Manuel; Monte-Moreno, Enric; Solé-Casals, Jordi (Springer, 2004)
    In this paper we propose the use of the independent component analysis (ICA) [1] technique for improving the classification rate of decision trees and multilayer perceptrons [2], [3]. The use of an ICA for the ...
  • ICA Cleaning procedure for EEG signals analysis: application to Alzheimer's disease detection
    Solé-Casals, Jordi; Vialatte, François B.; Pantel, J.; Prvulovic, D.; Haenschel, C.; Cichocki, Andrej (2010)
    To develop systems in order to detect Alzheimer’s disease we want to use EEG signals. Available database is raw, so the first step must be to clean signals properly. We propose a new way of ICA cleaning on a database ...
  • IFFTIFFT core architecture with an identical stage structure for wireless LAN communications
    Serra i Serra, Moisès; Martí i Puig, Pere; Carrabina, Jaume (IEEE, 2004)
    Abstrac(- This paper shows the design of the IFFT module corresponding to the baseband processing of an OFDM transmitter according to the IEEE802.11a-g and Hiperlan/2 standard. This module will be included in a future OFDM ...
  • Image Processing to Detect and Classify Situations and States of Elderly People
    Reig Bolaño, Ramon; Martí i Puig, Pere; Bajo, Javier; Rodríguez, Sara; De Paz, Juan F.; Rubio, Manuel P. (Springer, 2011)
    Abstract. Monitoring and tracking of elderly people using vision algorithms is an strategy gaining relevance to detect anomalous and potentially dangerous situations and react immediately. In general vision algorithms ...
  • Implementation of a Channel Equalizer for OFDM Wireless LANs
    Serra i Serra, Moisès; Martí i Puig, Pere; Carrabina, Jaume (IEEE, 2004)
    This paper presents an implementation of a channel equalizer for a wireless OFDM according to the IEEE 802.11a and Hiperlan/2 standard. In order to implement the equalizer, algorithms of low computational complexity have ...
  • Improved Sparse Bump Modeling for Electrophysiological Data
    Vialatte, François B.; Dauwels, Justin; Solé-Casals, Jordi; Maurice, Monique; Cichocki, Andrej (Springer, 2008)
    Bump modeling is a method used to extract oscillatory bursts in electrophysiological signals, who are most likely to be representative of local synchronies. In this paper we present an improved sparse bump modeling ...
  • Improving a leaves automatic recognition process using PCA
    Solé-Casals, Jordi; Travieso, Carlos M.; Alonso, Jesús B.; Ferrer, Miguel A. (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 ...
  • Improving algorithm speed in PNL mixture separation and Wiener system inversion
    Solé-Casals, Jordi; Babaie-Zadeh, Massoud; Jutten, Christian; Pham, Dinh-Tuan (2003)
    This paper proposes a very simple method for increasing the algorithm speed for separating sources from PNL mixtures or invertingWiener systems. The method is based on a pertinent initialization of the inverse system, ...
  • Improving the Quality of EEG Data in Patients With Alzheimers Disease Using ICA
    Vialatte, François B.; Solé-Casals, Jordi; Maurice, Monique; Latchoumane, Charles-François V.; Hudson, Niegel; Wimalaratna, Sunil R.; Jaeseung, Jeonga; Cichocki, Andrej (Springer, 2008)
    Does Independent Component Analysis (ICA) denature EEG signals? We applied ICA to two groups of subjects (mild Alzheimer patients and control subjects). The aim of this study was to examine whether or not the ICA method ...
  • Initialisation of Nonlinearities for PNL and Wiener systems Inversion
    Solé-Casals, Jordi; Jutten, Christian; Pham, Dinh-Tuan (Springer, 2003)
    This paper proposes a very fast method for blindly initial- izing a nonlinear mapping which transforms a sum of random variables. The method provides a surprisingly good approximation even when the basic assumption is ...
  • Integrative analysis of the Regulatory Region of the FGFR3 Oncogene
    Bau i Macià, Josep; Cullell i Dalmau, Marta; Solé-Casals, Jordi (Springer, 2011)
    The study of transcriptional regulation often needs the integration of diverse yet independent data. In the present work, sequence conservation, predic-tion of transcription factor binding sites (TFBS) and gene expression ...
  • Investigation of ICA algorithms for feature extraction of EEG signals in discrimination of Alzheimer disease
    Solé-Casals, Jordi; Vialatte, François B.; Chen, Zhe; Cichocki, Andrej (2008)
    In this paper we present a quantitative comparisons of different independent component analysis (ICA) algorithms in order to investigate their potential use in preprocessing (such as noise reduction and feature extraction) the ...
  • Market Stock Decisions Based on Morphological Filtering
    Martí i Puig, Pere; Reig Bolaño, Ramon; Bajo, Javier; Rodríguez, Sara (Springer, 2010)
    In this paper we use a nonlinear processing technique based on mathematical morphology to develop a simple day trading system that automatically decides the timing to commute the marked strategy in terms of sort/long ...
  • Mathematical Morphology Preprocessing to Mitigate AWGN Effects: Improving Pitch Tracking Performance in Hard Noise Conditions
    Martí i Puig, Pere; Solé-Casals, Jordi; Reig Bolaño, Ramon; Zaiats, Vladimir (Springer, 2010)
    Abstract. In this paper we show how a nonlinear preprocessing of speech signal -with high noise- based on morphological filters improves the performance of robust algorithms for pitch tracking (RAPT). This result happens ...
  • Nonlinear prediction based on score function
    Solé-Casals, Jordi; Monte-Moreno, Enric (2002)
    The linear prediction coding of speech is based in the assumption that the generation model is autoregresive. In this paper we propose a structure to cope with the nonlinear effects presents in the generation of the ...
  • Parameterization of written signatures based on EFD
    Martí i Puig, Pere; Danés Garolera, Jaume; Solé-Casals, Jordi (Springer, 2013)
    In this work we propose a method to quantify written signatures from digitalized images based on the use of Elliptical Fourier Descriptors (EFD). As usually signatures are not represented as a closed contour, and being ...
  • Population ageing and ICT: An exploratory review of technology innovation trough digital applications
    Solé-Casals, Jordi; Vancea, Mihaela; March Amengual, Jaume Miquel; Villà-Freixa, Jordi (ScitePress, 2014)
    The multidimensional process of physical, psychological, and social change produced by population ageing affects not only the quality of life of elderly people but also of our societies. Some dimensions of population ageing ...
  • Post-Nonlinear Mixtures and Beyond
    Solé-Casals, Jordi; Jutten, Christian (TSI Press, 2004)
    Although sources in general nonlinear mixturm arc not separable iising only statistical independence, a special and realistic case of nonlinear mixtnres, the post nonlinear (PNL) mixture is separable choosing a suited ...
  • Rapid prototyping with the visual data environment of an OFDM WLAN system
    Serra i Serra, Moisès; Martí i Puig, Pere; Carrabina, Jordi (SPIE, 2005)
    In this paper a rapid prototyping design flow is presented and applied to a prototype of the base-band physical layer of a Hiperlan/2 WLAN transceiver. This physical layer is a high performance multi-rate system that contains ...
  • Reducción del vector de características de reconocimiento facial
    Travieso, Carlos M.; Solé-Casals, Jordi; Zaiats, Vladimir; Alonso, Jesús B.; Ferrer, Miguel A. (2008)
    In this present work, we are proposing a characteristics reduction system for a facial biometric identification system, using transformed domains such as discrete cosine transformed (DCT) and discrete wavelets transformed ...

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