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Browsing by Author "Universitat de Vic. Escola Politècnica Superior"

Browsing by Author "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 ...
  • 3r Mercatec Osona
    Universitat de Vic. Escola Politècnica Superior (03-05-2012)
    El Mercatec Osona és una exposició de treballs i projectes de tecnologia i ciències aplicades de diverses centres educatius d'Osona, el Ripollès, i zones circumdants, que ofereix als estudiants la possibilitat de mostrar ...
  • 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 contour based approach for bilateral mammogram registration using discrete wavelet analysis
    Reig Bolaño, Ramon; Parisi Baradad, Vicenç; Martí i Puig, Pere (Springer, 2009)
    Registration of mammograms is an essential step to increase the effectiveness of all screening programs planned to early detect breast cancer in asymptomatic women. New techniques based on data fusion of different spatial ...
  • A dynamic model for the risk of bladder cancer progression
    Porta, Núria; Calle, M. Luz; Malats i Riera, Núria; Gómez, Guadalupe (Wiley, 2012)
    We propose a multistate modeling approach to describe the observed evolution of patients diagnosed with nonmuscle- invasive bladder cancer. On the basis of data from the Spanish Bladder Cancer/EPICURO study, we adjust a ...
  • 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 new otolith image contour descriptor based on partial reflection
    Reig Bolaño, Ramon; Martí i Puig, Pere; Lombarte, A.; Soria Pérez, José Antonio; Parisi Baradad, Vicenç (Springer, 2010)
    In this paper we propose a new contour descriptor for reconstructing fish otolith contours that uses half the number of coefficients needed by the classical elliptical Fourier descriptors (EFDs) for the same accuracy. The ...
  • A non-linear VAD for noisy environments
    Solé-Casals, Jordi; Zaiats, Vladimir (Springer, 2010)
    This paper deals with non-linear transformations for improving the performance of an entropy-based voice activity detector (VAD). The idea to use a non-linear transformation has already been applied in the field of ...
  • 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 Semiparametric hierarchical method for a regression model with an interval-censored covariate
    Calle, M. Luz; Gómez, Guadalupe (Blackwell Publishers, 2005)
    A Bayesian framework is proposed for analysing regression models in which one of the covariates is interval-censored. Such a situation was encountered in an AIDS clinical trial in which the goal was to examine the ...
  • 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 subcritical instability of wave-driven alongshore currents
    Dodd, Nick; Iranzo, Vicente; Caballeria, Miquel (American Geophyisical Union, 2004)
    The development of shear instabilities of a wave-driven alongshore current is investigated. In particular, we use weakly nonlinear theory to investigate the possibility that such instabilities, which have been observed ...
  • A vision for transdisciplinarity in Future Earth: Perspectives from young researchers
    Rivera-Ferre, Marta G.; Pereira, Laura; Karpouzoglou, Timothy; Nicholas, Kimberly A.; Onzere, Sheila (New Leaf Associates, 2013)
    Meeting the demand for food, energy, and water as world population increases is a major goal for the food systems of the future These future challenges, which are complex, multiscalar, and cross-sectoral in nature, require ...
  • 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 ...
  • Adapting established instruments to build useful food sovereignty indicators
    Binimelis Adell, Rosa; Rivera-Ferre, Marta G.; Tendero, Guillem; Badal, Marc; Heras, María; Gamboa, Gonzalo; Ortega Cerdà, Miquel (Taylor & Francis, 2014)
    The recent context of global food emergency and ecological crisis has increased the relevance of people’s struggle for food sovereignty (FSv), which promotes the transformation of the dominant food system and claims ‘the ...
  • 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 ...

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