El treball del grup comprèn l'optimització numèrica, la modelització de problemes resolubles amb optimització, i l'aplicació de tècniques adients a problemes de l'enginyeria, la indústria, la logística i les tecnologies de la informació. L'optimització numèrica inclou l'estudi de les propietats del problemes estudiats, l'anàlisi de nous algorismes d'optimització (lineal, no lineal, contínua, entera i combinatòria), el desenvolupament de procediments numèrics per a la seva implementació computacional eficient i la comparació amb algorismes previs, si existeixen. La part de modelització implica la cerca de formulacions escaients que permetin la resolució de problemes reals, sovint de gran dimensió. Els problemes reals en que el grup està treballant actualment són: protecció i privacitat de dades estadístiques; i generació òptima d'electricitat en un entorn multimercat.

http://futur.upc.edu/GNOM

The group works on both the numerical optimisation and the modelling of problems that can be solved through optimisation. Its work on numerical optimisation includes the analysis of new optimisation algorithms (linear, nonlinear, continuous and integer) and their convergence, the development of numerical procedures for their efficient computational implementation, and the comparison to existing algorithms. The work on modelling focuses on the solution of real problems, which are often large-scale, by finding an equivalentmathematical formulation leading to an optimisation problem, and applying a suitable solver, that has either been specially developed or is commercially available. The modelling languages that are available are used.

http://futur.upc.edu/GNOM

The group works on both the numerical optimisation and the modelling of problems that can be solved through optimisation. Its work on numerical optimisation includes the analysis of new optimisation algorithms (linear, nonlinear, continuous and integer) and their convergence, the development of numerical procedures for their efficient computational implementation, and the comparison to existing algorithms. The work on modelling focuses on the solution of real problems, which are often large-scale, by finding an equivalentmathematical formulation leading to an optimisation problem, and applying a suitable solver, that has either been specially developed or is commercially available. The modelling languages that are available are used.

http://futur.upc.edu/GNOM

Enviaments recents

  • Heuristic solucions to the facility location problem with general Bernoulli demands 

    Albareda Sambola, Maria; Fernández Aréizaga, Elena; Saldanha da Gama, Francisco (2017-09-28)
    Article
    Accés obert
    In this paper, a heuristic procedure is proposed for the facility location problem with general Bernoulli demands. This is a discrete facility location problem with stochastic demands that can be formulated as a two-stage ...
  • Bases numèriques de les rutines del paquet "POPNOLC", "AGTU", "AFAU", "AFSU, i "AQCH" d'actualització de factoritzacions de Cholesky, per addició o sostracció de matrius de rang U 

    Nabona Francisco, Narcís (1985)
    Report de recerca
    Accés obert
    Efectua una deducció dels algorismes coneguts i d'actualització de factoritzacions de Cholesky de matrius simàtriques definides positives, per addició o sostracció de matrius de rang u. A més se'n fa una anàlisi numèrica ...
  • Comparison of production strategies and degree of postponement when incorporating additive manufacturing to product supply chains 

    Minguella Canela, Joaquim; Muguruza Blanco, Asier; Ramón Lumbierres, Daniel Jacobo; Heredia, F.-Javier (Francisco Javier); Gimeno Feu, Robert; Guo, Ping; Hamilton, Mary; Shastry, Kiron; Webb, Sunny (2017-10-06)
    Article
    Accés obert
    The best-selling products manufactured nowadays are made in long series along rigid product value chains. Product repetition and continuous/stable manufacturing is seen as a chance for achieving economies of scale. ...
  • On using an improved Benders method for cell suppression 

    Baena, Daniel; Castro Pérez, Jordi; Frangioni, Antonio (2017)
    Text en actes de congrés
    Accés obert
    The cell suppression problem (CSP) is one of the most widely applied methods for tabular data protection. Given a set of primary cells to be protected, CSP aims at finding a set of secondary cells to be additionally removed ...
  • Demand aggregator flexibility forecast: price incentives sensitivity assessment 

    Kotsis, Grigorios; Moschos, Ioannis; Corchero García, Cristina; Cruz Zambrano, Miguel (Institute of Electrical and Electronics Engineers (IEEE), 2015)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    This work seeks to determine the potentials of a Demand Aggregator into the Demand Response scheme. The authors describe and validate the optimization technique used by the Aggregator to enable demand flexibility in domestic ...
  • 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. ...
  • Optimización de costos logísticos: un caso de estudio de una empresa de plásticos 

    Mata Pérez, Miguel; Heredia, F.-Javier (Francisco Javier); Morales Carreón, Claudia Maribel (2016)
    Text en actes de congrés
    Accés obert
    Hoy en día los costos logísticos representan una gran oportunidad de mejora para las empresas siendo los costos de transporte y los costos de inventario los más representativos. En este trabajo se presenta un estudio de ...
  • 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 ...
  • A second order cone formulation of continuous CTA model 

    Lesaja, Goran; Castro Pérez, Jordi; Oganian, Anna (Springer, 2016)
    Text en actes de congrés
    Accés obert
    In this paper we consider a minimum distance Controlled Tabular Adjustment (CTA) model for statistical disclosure limitation (control) of tabular data. The goal of the CTA model is to find the closest safe table to some ...
  • Revisiting interval protection, a.k.a. partial cell suppression, for tabular data 

    Castro Pérez, Jordi; Via Baraldés, Anna (Springer, 2016)
    Text en actes de congrés
    Accés obert
    Interval protection or partial cell suppression was introduced in “M. Fischetti, J.-J. Salazar, Partial cell suppression: A new methodology for statistical disclosure control, Statistics and Computing, 13, 13–21, 2003” as ...

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