Now showing items 1-19 of 19

  • Characterization of phylogenetic networks with NetTest 

    Arenas, Miguel; Patricio, Mateus; Posada, David; Valiente Feruglio, Gabriel Alejandro (2010-05-20)
    Article
    Open Access
    Background: Typical evolutionary events like recombination, hybridization or gene transfer make necessary the use of phylogenetic networks to properly depict the evolution of DNA and protein sequences. Although several ...
  • Deterministic and stochastic assessment of the harmonic currents consumed by discharge lamps 

    Mesas García, Juan José; Sainz Sapera, Luis; Ferrer Biosca, Alberto (2011-01)
    Article
    Restricted access - publisher's policy
  • Empirical approach for real-time estimation of air flow rates in a subway station 

    Di Perna, Costanzo; Carbonari, Alessandro; Ansuini, Roberta; Casals Casanova, Miquel (2014-05-01)
    Article
    Restricted access - publisher's policy
    The EU-funded project called SEAM4US (Sustainable Energy mAnageMent for Underground Stations) is targeted to define advanced control systems for cost-effective management of subway stations, which will be applied to the pilot
  • Estimation of the uncertainty in time domain indices of RR time series 

    García González, Miguel Ángel; Fernández Chimeno, Mireya; Ramos Castro, Juan José (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2007-03-31)
    Article
    Open Access
    A method for estimating the uncertainty in time-domain indices of RR time series is described. The method relies on the central limit theorem that states that the distribution of a sample average of independent samples has ...
  • Frames: a maximum entropy statistical estimate of the inverse problem 

    Rebollo Neira, Laura; Fernández Rubio, Juan Antonio; Plastino, Angel Luís (1997-01)
    Open Access
    A maximum entropy statistical treatment of an inverse problem concerning frame theory is presented. The problem arises from the fact that a frame is an overcomplete set of vectors that defines a mapping with no unique ...
  • Generalized equipartition theorem and confining walls 

    Rey Oriol, Rosendo (2015-06)
    Article
    Open Access
    It is shown that the generalized equipartition theorem as applied to the momentum may fail, even though the usual conditions of validity are met. This failure is linked to the nature of the confining walls, with ideal walls ...
  • N-gram-based Machine Translation 

    Mariño Acebal, José Bernardo; Banchs Martínez, Rafael Enrique; Crego Clemente, Josep Maria; Gispert Brosa, Adrian de; Lambert, Patrik; Rodríguez Fonollosa, José Adrián; Ruiz Costa-Jussà, Marta (2006-12)
    Article
    Open Access
    This article describes in detail an n-gram approach to statistical machine translation. This approach consists of a log-linear combination of a translation model based on n-grams of bilingual units, which are referred to ...
  • On the inverse windowed Fourier transform 

    Rebollo Neira, Laura; Fernández Rubio, Juan Antonio (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1999-11-30)
    Article
    Open Access
    The inversion problem concerning the windowed Fourier transform is considered. It is shown that, out of the infinite solutions that the problem admits, the windowed Fourier transform is the "optimal" solution according to ...
  • Positive time-frequency distributions based on joint marginal constraints 

    Rodríguez Fonollosa, Javier (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1996-08-01)
    Article
    Open Access
    This correspondence studies the formulation of members of the Cohen-Posch class of positive time-frequency energy distributions. Minimization of cross-entropy measures with respect to different priors and the case of ...
  • Reply to 

    Egozcue Rubí, Juan José (2009-10)
    Article
    Restricted access - publisher's policy
  • Routing with prioritization based on statistics in OBS networks 

    Escolar Díaz, Mariana; Hesselbach Serra, Xavier (2009)
    Conference report
    Open Access
    This paper introduces a new strategy to provide QoS in IP/OBS networks, using Routing with Prioritization Based on Statistics (RPBS). This proposal uses the feedback scheme in optical networks to provide statistical knowledge ...
  • Statistical Modelling of Channel Occupancy in Trunked PAMR Systems 

    Jordán Parra, Javier; Barceló Arroyo, Francisco (Elsevier Science B.V., 1997-06)
    Article
    Restricted access - publisher's policy
    Public access mobile radio systems (PAMR) using trunking technology allow more efficient use of the frequency spectrum, as all the users of the system jointly use a common pool of channels. Trunked PAMR systems can operate ...
  • Statistical reference criteria for adaptive signal processing in digital communications 

    Sala i Álvarez, Josep; Vázquez Grau, Gregorio (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1997-01-01)
    Article
    Open Access
    A general criterion for the design of adaptive systems in digital communications called the statistical reference criterion is proposed. The criterion is based on imposition of the probability density function of the ...
  • Statistical study of resonance in AC traction systems equipped with Steinmetz circuit 

    Monjo Mur, Lluís; Sainz Sapera, Luis; Rull Duran, Joan (2013-10)
    Article
    Restricted access - publisher's policy
    AC traction systems can be 25 kV/50 Hz single-phase, non-linear, time-varying loads of random naturecausing unbalance and distortion of the supply voltages. To reduce voltage unbalance, thyristor controlledreactances are ...
  • Statistics of the slope-method estimator 

    Rocadenbosch Burillo, Francisco; Comerón Tejero, Adolfo; Albiol Schnitger, Lorena (Optical Society of America, 2000-11-30)
    Article
    Open Access
    The slope method has customarily been used and is still used for inversion of atmospheric optical parameters, extinction, and backscatter in homogeneous atmospheres from lidar returns. Our aim is to study the underlying ...
  • System identification using a linear combination of cumulant slices 

    Rodríguez Fonollosa, José Adrián; Vidal Manzano, José (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1993-07-01)
    Article
    Open Access
    In this paper we develop a new linear approach to identify the parameters of a moving average (MA) model from the statistics of the output. First, we show that, under some constraints, the impulse response of the system ...
  • The continuous wavelet transform as a maximum entropy solution of the corresponding inverse problem 

    Rebollo Neira, Laura; Fernández Rubio, Juan Antonio (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1999-07-31)
    Article
    Open Access
    The continuous wavelet transform is obtained as a maximum entropy solution of the corresponding inverse problem. It is well known that although a signal can be reconstructed from its wavelet transform, the expansion is ...
  • The influence of 5-HTT and COMT genotypes on verbal fluency in ecstasy users 

    Fagundo, Ana B.; Cuyas, Elisabet; Verdejo Garcia, Antonio; Khymenets, Olha; Langohr, Klaus; Martín-Santos, Rocío; Farré, Magí; de la Torre, Rafael (2010-09)
    Article
    Restricted access - publisher's policy
    Deficits in verbal fluency associated with ecstasy use have been well established; however, the mechanisms underlying this impairment have yet to be elucidated. In this study we investigated for the first time whether there ...
  • Wigner higher-order spectra: definition, properties, computation and application to transient signal analysis 

    Rodríguez Fonollosa, Javier; Nikias, Chrysostomos L. (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1993-01-31)
    Article
    Open Access
    The Wigner higher order moment spectra (WHOS) are defined as extensions of the Wigner-Ville distribution (WD) to higher order moment spectra domains. A general class of time-frequency higher order moment spectra is also ...