Now showing items 21-40 of 79

    • BASES DE DADES (Examen 2n quadrim) 

      Gavaldà Mestre, Ricard (Universitat Politècnica de Catalunya, 2007-05-23)
      Exam
      Restricted access to the UPC academic community
    • Bases de Dades (Examen 2n quadrimestre) 

      Gavaldà Mestre, Ricard (Universitat Politècnica de Catalunya, 2007-06-29)
      Exam
      Restricted access to the UPC academic community
    • Bootstrapping and learning PDFA in data streams 

      Balle Pigem, Borja de; Castro Rabal, Jorge; Gavaldà Mestre, Ricard (2012)
      Conference report
      Open Access
      Markovian models with hidden state are widely-used formalisms for modeling sequential phenomena. Learnability of these models has been well studied when the sample is given in batch mode, and algorithms with PAC-like ...
    • Bounding the expected length of longest common subsequences and forests 

      Scheihing, R.; Navarro, G.; Gavaldà Mestre, Ricard; Baeza-Yates, R. (1998-09-01)
      External research report
      Open Access
      We present improvements to two techniques to find lower and upper bounds for the expected length of longest common subsequences and forests of two random sequences of the same length, over a fixed size, uniformly ...
    • Bounding the expected length of longest common subsequences and forests 

      Baeza-Yates, Ricardo A; Gavaldà Mestre, Ricard; Navarro, Gonzalo (1996-05)
      External research report
      Open Access
      Subsumed by LSI-98-50-R
    • Building green cloud services at low cost 

      Berral García, Josep Lluís; Goiri, Iñigo; Nguyen, Thu D.; Gavaldà Mestre, Ricard; Torres Viñals, Jordi; Bianchini, Ricardo (Institute of Electrical and Electronics Engineers (IEEE), 2014)
      Conference lecture
      Open Access
      Interest in powering datacenters at least partially using on-site renewable sources, e.g. solar or wind, has been growing. In fact, researchers have studied distributed services comprising networks of such “green” datacenters, ...
    • Characterization of the CPAP-treated patient population in Catalonia 

      Turino, Cecilia; Bertrán, Sandra; Gavaldà Mestre, Ricard; Teixidó, Ivan; Woehrle, Holger; Rué, Montserrat; Solsona, Francesc; Escarrabill, Joan; Colls, Cristina; García Altés, Anna; Batlle, Jordi de; Sánchez de la Torre, Manuel; Barbé, Ferran (2017-09-21)
      Article
      Open Access
      There are different phenotypes of obstructive sleep apnoea (OSA), many of which have not been characterised. Identification of these different phenotypes is important in defining prognosis and guiding the therapeutic ...
    • Characterizing chronic disease and polymedication prescription patterns from electronic health records 

      Zamora, Martí; Baradad, Manel; Amado, Ester; Cordomí, Sílvia; Limón, Esther; Ribera, Juliana; Arias Vicente, Marta; Gavaldà Mestre, Ricard (Institute of Electrical and Electronics Engineers (IEEE), 2015)
      Conference report
      Open Access
      Population aging in developed countries brings an increased prevalence of chronic disease and of polymedication-patients with several prescribed types of medication. Attention to chronic, polymedicated patients is a priority ...
    • Clustering patients with tensor decomposition 

      Ruffini, Matteo; Gavaldà Mestre, Ricard; Limón, Esther (2017)
      Conference lecture
      Open Access
      In this paper we present a method for the unsupervised clustering of high-dimensional binary data, with a special focus on electronic healthcare records. We present a robust and efficient heuristic to face this problem ...
    • Coding complexity: the computational complexity of succinct descriptions 

      Balcázar Navarro, José Luis; Gavaldà Mestre, Ricard; Watanabe, Osamu (1996-09)
      External research report
      Open Access
      For a given set of strings, the problem of obtaining a succinct description becomes an important subject of research, related to several areas of theoretical computer science. In structural complexity theory, researchers ...
    • Compressibility of infinite binary sequences 

      Balcázar Navarro, José Luis; Gavaldà Mestre, Ricard; Hermo Huguet, Montserrat (1996-02-06)
      External research report
      Open Access
      It is known that infinite binary sequences of constant Kolmogorov complexity are exactly the recursive ones. Such a kind of statement no longer holds in the presence of resource bounds. Contrary to what intuition might ...
    • Computational complexity of small descriptions 

      Gavaldà Mestre, Ricard; Watanabe, Osamu (1990-11-19)
      External research report
      Open Access
      For a set L that is polynomial time reducible (in short, = sub T super P-reducible) to some sparse set, we investigate the computational complexity of such sparse sets relative to L. We construct sets A and B such that ...
    • Computational power of neural networks: a Kolmogorov complexity characterization 

      Balcázar Navarro, José Luis; Gavaldà Mestre, Ricard; Siegelmann, H. (1993-01-01)
      External research report
      Open Access
      The computational power of neural networks depends on properties of the real numbers used as weights. We focus on networks restricted to compute in polynomial time, operating on boolean inputs. Previous work has demonstrated ...
    • Detecting sentiment change in twitter streaming data 

      Bifet Figuerol, Albert Carles; Holmes, Geoffrey; Pfahringer, Bernhard; Gavaldà Mestre, Ricard (2011)
      Conference report
      Open Access
      MOA-TweetReader is a real-time system to read tweets in real time, to detect changes, and to fi nd the terms whose frequency changed. Twitter is a micro-blogging service built to discover what is happening at any moment ...
    • Discontinuities in recurrent neural networks 

      Gavaldà Mestre, Ricard; Siegelmann, Hava T (1997-03)
      External research report
      Open Access
      This paper studies the computational power of various discontinuous real computational models that are based on the classical analog recurrent neural network (ARNN). This ARNN consists of finite number of neurons; each ...
    • Does training affect match performance? A study using data mining and tracking devices 

      Fernández, Javier; Medina Leal, Daniel; Gómez, Antonio; Arias Vicente, Marta; Gavaldà Mestre, Ricard (2016)
      Conference lecture
      Open Access
      FIFA has recently allowed the use of electronic performance and tracking systems (EPTS) in professional football competition, providing teams with novel and more accurate data. Physical performance has not yet taken much ...
    • Empowering automatic data-center management with machine learning 

      Berral García, Josep Lluís; Gavaldà Mestre, Ricard; Torres Viñals, Jordi (2013)
      External research report
      Open Access
      The Cloud as computing paradigm has become nowadays crucial for most Internet business models. Managing a cloud and optimizing its performance on a moment-by-moment basis is not easy given as the amount and diversity of ...
    • Empowering automatic data-center management with machine learning 

      Berral García, Josep Lluís; Gavaldà Mestre, Ricard; Torres Viñals, Jordi (2013)
      Conference lecture
      Restricted access - publisher's policy
      The Cloud as computing paradigm has become nowadays crucial for most Internet business models. Managing and optimizing its performance on a moment-by-moment basis is not easy given as the amount and diversity of elements ...
    • Energy-efficient and multifaceted resource management for profit-driven virtualized data centers 

      Goiri Presa, Íñigo; Berral García, Josep Lluís; Fitó, Josep Oriol; Julià Massó, Ferran; Nou Castell, Ramon; Guitart Fernández, Jordi; Gavaldà Mestre, Ricard; Torres Viñals, Jordi (Elsevier, 2012-05)
      Article
      Restricted access - publisher's policy
      As long as virtualization has been introduced in data centers, it has been opening new chances for resource management. Nowadays, it is not just used as a tool for consolidating underused nodes and save power; it also ...
    • Enrichment of virtual screening results using induced-fit techniques 

      Iglesias, Jelisa; Sae-oon, Suwipa; Hernandez, Gabriela; Estrada, Jorge; Gavaldà Mestre, Ricard; Guallar, Victor (Barcelona Supercomputing Center, 2015-05-05)
      Conference report
      Open Access
      This project aims to improve the results of virtual screening and docking techniques used for drug design, using induced-fit techniques and a consensus scoring approach.