Enviaments recents

  • On geometrical properties of preconditioners in IPMs for classes of block-angular problems 

    Castro Pérez, Jordi; Nasini, Stefano (2017)
    Article
    Accés obert
    One of the most efficient interior-point methods for some classes of block-angular structured problems solves the normal equations by a combination of Cholesky factorizations and preconditioned conjugate gradient for, ...
  • A linear optimization based method for data privacy in statistical tabular data 

    Castro Pérez, Jordi; González Alastrué, José Antonio (2017-06-15)
    Article
    Accés obert
    National Statistical Agencies routinely disseminate large amount of data. Prior to dissemination these data have to be protected to avoid releasing confidential information. Controlled tabular adjustment (CTA) is one of ...
  • The probabilistic p-center problem: Planning service for potential customers 

    Martínez Merino, Luisa I.; Albareda Sambola, Maria; Rodríguez Chía, Antonio Manuel (Elsevier, 2017-10-16)
    Article
    Accés restringit per política de l'editorial
    This work deals with the probabilistic p-center problem, which aims at minimizing the expected maximum distance between any site with demand and its center, considering that each site has demand with a specific probability. ...
  • Taking advantage of unexpected WebCONSORT results 

    Cobo Valeri, Erik; González Alastrué, José Antonio (2016)
    Article
    Accés obert
    To estimate treatment effects, trials are initiated by randomising patients to the interventions under study and finish by comparing patient evolution. In order to improve the trial report, the CONSORT statement provides ...
  • Hub network design problems with profits 

    Alibeyg, Armaghan; Contreras Aguilar, Ivan; Fernández Aréizaga, Elena (2016-12-01)
    Article
    Accés restringit per política de l'editorial
    This paper presents a class of hub network design problems with profit-oriented objectives, which extend several families of classical hub location problems. Potential applications arise in the design of air and ground ...
  • Introducing capacitaties in the location of unreliable facilities 

    Albareda Sambola, Maria; Landete, Mercedes; Monge Ivars, Juan Francisco; Sainz Pardo, José Luis (Elsevier, 2017-05-16)
    Article
    Accés restringit per política de l'editorial
    The goal of this paper is to introduce facility capacities into the Reliability Fixed-Charge Location Problem in a sensible way. To this end, we develop and compare different models, which represent a tradeoff between the ...
  • Interior-point solver for convex separable block-angular problems 

    Castro Pérez, Jordi (2016-01)
    Article
    Accés obert
    Constraints matrices with block-angular structures are pervasive in optimization. Interior-point methods have shown to be competitive for these structured problems by exploiting the linear algebra. One of these approaches ...
  • A cutting-plane approach for large-scale capacitated multi-period facility location using a specialized interior-point method 

    Castro Pérez, Jordi; Nasini, Stefano; Saldanha da Gama, Francisco (2016-09-19)
    Article
    Accés obert
    We propose a cutting-plane approach (namely, Benders decomposition) for a class of capacitated multi-period facility location problems. The novelty of this approach lies on the use of a specialized interior-point method ...
  • A mathematical programming approach for different scenarios of bilateral bartering 

    Nasini, Stefano; Castro Pérez, Jordi; Fonseca Casas, Pau (Institut d'Estadística de Catalunya, 2015-01-01)
    Article
    Accés obert
    The analysis of markets with indivisible goods and fixed exogenous prices has played an important role in economic models, especially in relation to wage rigidity and unemployment. This paper provides a novel mathematical ...
  • Importancia de la potencia y la hipótesis en el valor p 

    Cortés Martínez, Jordi; Casals, Martí; Langohr, Klaus; González Alastrué, José Antonio (Elsevier, 2015-12-09)
    Article
    Accés obert
    Los lectores de Medicina Clínica conocen bien la importancia de definir bien el denominador de una proporción para estimar una probabilidad: “No es lo mismo la probabilidad de que un católico sea Papa que la de que un Papa ...

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