Now showing items 1-18 of 18

  • Absolute-type shaft encoding using LFSR sequences with a prescribed length 

    Fuertes Armengol, José Mª; Balle Pigem, Borja de; Ventura Capell, Enric (2008-03-31)
    Article
    Open Access
    Maximal-length binary sequences have existed for a long time. They have many interesting properties, and one of them is that, when taken in blocks of n consecutive positions, they form 2n - 1 different codes in a closed ...
  • Absolute type shaft encoding using LFSR sequences with prescribed length 

    Fuertes Armengol, José Mª; Balle, Borja; Ventura Capell, Enric (2006-02)
    Article
    Open Access
    Maximal-length binary sequences have been known for a long time. They have many interesting properties, one of them is that when taken in blocks of n consecutive positions they form 2 n ° 1 diÆerent codes in a ...
  • Association between time to reperfusion and outcome is primarily driven by the time from imaging to reperfusion 

    Ribó, Marc; Molina, Carlos A.; Cobo Valeri, Erik; Cerda, Neus; Tomasello, Alejandro; Urra, Xabier; Sanroman, Luis; Dávalos Errando, Antoni; Jovin, Tudor G. (2016-04-01)
    Article
    Open Access
    Background and Purpose A progressive decline in the odds of favorable outcome as time to reperfusion increases is well known. However, the impact of specific workflow intervals is not clear.; Methods We studied the mechanical ...
  • A stochastic version of the strategy-based congested transit assignment model and a technique by smoothing approximations 

    Codina Sancho, Esteve; Rosell Camps, Francisca (Springer, 2018)
    Article
    Restricted access - publisher's policy
    This paper develops a stochastic version for the strategybased congested transit assignment problem stated by Cominetti and Correa (Trans. Sci. 35(3):250-267, 2001). As a distinctive approach, this stochastic version takes ...
  • Bayesian Optimization in Machine Learning 

    Jiménez Luna, José (Universitat Politècnica de Catalunya / Universitat de Barcelona, 2017-06)
    Master thesis
    Open Access
    Bayesian optimization has risen over the last few years as a very attractive approach to find the optimum of noisy, expensive to evaluate, and possibly black-box functions. One of the fields where these functions are common ...
  • Comparación de la estimación de la volatilidad de una serie financiera, a través de la metodología del filtro de Kalman y el filtro de partículas en el contexto de los modelos de espacio-estado 

    Quispe Anastacio, Erick Mauricio (Universitat Politècnica de Catalunya / Universitat de Barcelona, 2018-06)
    Master thesis
    Open Access
    Mediante un ejercicio comparativo, el objetivo del presente trabajo, es estimar la volatilidad de una serie financiera a través de dos algoritmos; el filtro de Kalman y el filtro de partículas, abordados en el contexto de ...
  • Contagion between United States and european markets during the recent crises 

    Muñoz Gracia, María del Pilar; Márquez Cebrián, Dolores; Sánchez Espigares, Josep Anton (2011-07)
    Article
    Open Access
    The main objective of this paper is to detect the existence of financial contagion between the North American and European markets during the recent crises. To accomplish this, the relationships between the US and the Euro ...
  • Disseny d'assaig clínic seqüencial de comparació de temps de supervivència amb aproximació bayesiana i models d'Ahmed i Beta-Binomial 

    Navarro Pérez, Valentí (Universitat Politècnica de Catalunya, 2011-02)
    Master thesis
    Open Access
    Aquest treball de màster conté una proposta de disseny d'assaig clínic bayesià seqüencial basat en el model d'Ahmed pel càlcul de la supervivència i en el model conjugat beta-binomial per la variable de seguretat. A més ...
  • Disseny i anàlisi d'un assaig clínic seqüencial per a malalts d'ICTUS 

    Cerdà Ros, Maria Neus (Universitat Politècnica de Catalunya, 2015-07)
    Master thesis (pre-Bologna period)
    Restricted access - author's decision
    Programació amb SAS de l anàlisi de la variable principal d un assaig clínic de disseny seqüencial en pacients amb ictus. La assignació és dinàmica, minimitzant les diferències en 5 factors pronòstics mesurats immediatament ...
  • Ideal hierarchical secret sharing schemes 

    Farràs Ventura, Oriol; Padró Laimon, Carles (Springer, 2010)
    Conference report
    Open Access
    Hierarchical secret sharing is among the most natural generalizations of threshold secret sharing, and it has attracted a lot of attention from the invention of secret sharing until nowadays. Several constructions of ideal ...
  • Introduction to natural language understanding and chatbots 

    Cristino Marcos, Víctor (Universitat Politècnica de Catalunya, 2018-09)
    Bachelor thesis
    Open Access
    The aim of this thesis is to give an introduction to Natural Language Understanding. Many tools and language models are described along this work in order to teach a machine the ability to analyze and understand human ...
  • Inverse sampling and triangular sequential designs to compare a small proportion with a reference value 

    Moreno Aguado, Víctor; Martín, Isaac; Torres, Fernando; Horas, Manuel; Ríos, José; González, Juan R. (Institut d'Estadística de Catalunya, 2002)
    Article
    Open Access
    Inverse sampling and formal sequential designs may prove useful in reducing the sample size in studies where a small population proportion p is compared with a hypothesized reference proportion p0. These methods are applied ...
  • Lesiones en la lucha tradicional: el caso de la lucha leonesa (2005-2015) 

    Blasco Carmona, M. J.; Casals Toquero, Martí; Fernández Villa, Tania; Langohr, Klaus (2018-12-01)
    Article
    Open Access
    El objetivo de este estudio fue describir la localización anatómica, el tipo y la gravedad de las lesiones ocurridas en las competiciones oficiales de las ligas de verano masculinas (2005-2015) de Lucha Leonesa. Al objeto ...
  • On sequential and fixed designs for estimation with comparisons and applications 

    Terbeche, Mekki; Broderick O. Oluyede; Barbour, Ahmed (Institut d'Estadística de Catalunya, 2005)
    Article
    Open Access
    HolaA fully sequential approach to the estimation of the difference of two population means for distributions belonging to the exponential family of distributions is adopted and compared with the best fixed design. Results ...
  • Optimal non-perfect uniform secret sharing schemes 

    Farràs Ventura, Oriol; Hansen, Torben; Kaced, Tarik; Padró Laimon, Carles (Springer, 2014)
    Conference report
    Open Access
    A secret sharing scheme is non-perfect if some subsets of participants that cannot recover the secret value have partial information about it. The information ratio of a secret sharing scheme is the ratio between the maximum ...
  • Safety and efficacy of thrombectomy in acute ischaemic stroke (REVASCAT): 1-year follow-up of a randomised open-label trial 

    Dávalos Errando, Antoni; Cobo Valeri, Erik; Molina, Carlos A.; Chamorro, Ángel; de Miquel, Maria Angeles; San Román, L.; Serena Leal, Joaquín; López-Cancio, Elena; Ribó, Marc; Millán, Mónica; Urra, Xabier; Cardona, Pere; Tomasello, Alejandro; Castaño, Carlos; Blasco, Jordi; Aja, Lucia; Rublera, Marta; Gomis Cortina, Meritxell; Renú, Arturo; Lara, Blanca; Fàbregas, Joan Martí; Jankowitz, Brian; Cerdà, Neus; Jovin, Tudor G. (2017-03-16)
    Article
    Open Access
  • Sample size computation for non-inferiority trials with survival endpoint and interim analyses 

    Alonso García, Lucia Alexandra (Universitat Politècnica de Catalunya / Universitat de Barcelona, 2018-06)
    Master thesis
    Restricted access - author's decision
    The main goal of this master thesis is to compute the sample size of the OPTIMAL study (OPTimizing Irradiation through Molecular Assessment of Lymph node), which is a non-inferiority clinical trial with survival data and ...
  • Which method to use? An assessment of data mining methods in Environmental Data Science 

    Gibert, Karina; Izquierdo Sebastián, Joaquín; Sànchez-Marrè, Miquel; Hamilton, Serena H.; Rodriguez Roda, Ignasi; Holmes, Geoffrey (Elsevier, 2018-12)
    Article
    Restricted access - publisher's policy
    Data Mining (DM) is a fundamental component of the Data Science process. Over recent years a huge library of DM algorithms has been developed to tackle a variety of problems in fields such as medical imaging and traffic ...