Exploració per tema "Operations research"

Ara es mostren els items 1-20 de 254

    • 4IR Integration of information technology best practice framework in operational technology 

      Shilenge, Musa; Telukdarie, Arnesh (OmniaScience, 2021)
      Article
      Accés obert
      Purpose: Since inception in the 1970s, Operational Technology (OT) systems were designed to operate in isolation from Information Technology (IT) systems mainly due to differences in objectives relating to Confidentiality, ...

    • A branch and bound approach for the capacitated plant location problem using cuts from the partial convex hull 

      Barceló Bugeda, Jaime (1984)
      Report de recerca
      Accés obert
      The efficient solution of capacitated plant location problems usually requires the development of specific software mainly when the problems are pure integer ones, standard mathematical programming codes being highly ...

    • A case study for the assessment of a dynamic passenger ride sharing mobility service 

      Linares Herreros, María Paz; Montero Mercadé, Lídia; Barceló Bugeda, Jaime; Casanovas Garcia, Josep; Carmona Bautista, Carlos; Serch, Oriol (2017)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Sustainable mobility is not merely a technological question. While automotive technology will be part of the solution, it will also be combined with a paradigm shift from car ownership to vehicle usage, which itself will ...

    • A Dynamic Stochastic Model For Balance Sheet Optimization 

      Barnils Sanchez, Armand (Universitat Politècnica de Catalunya / Illinois Institute of Technology, 2013)
      Treball Final de Grau
      Accés restringit per decisió de l'autor
      Realitzat a/amb:   Illinois Institute of Technology

    • A flexoelectric microelectromechanical system on silicon 

      Bhaskar, Umesh Kumar; Banerjee, Nirupam; Abdollahi Hosnijeh, Amir; Wang, Zhen; Scholm, Darrell G.; Rijnders, Guus; Catalan, Gustau (2016)
      Article
      Accés obert
      Flexoelectricity allows a dielectric material to polarize in response to a mechanical bending moment and, conversely, to bend in response to an electric field. Compared with piezoelectricity, flexoelectricity is a weak ...

    • A flow formulation for the optimum communication spanning tree 

      Fernández Aréizaga, Elena; Luna Mota, Carlos; Hildenbrandt, Achim; Reinelt, Gerard; Wiesberg, Stefan (Universidad de La Laguna, 2013)
      Text en actes de congrés
      Accés obert
      In this paper we address the Optimum Communication Spanning Tree Problem. We present a formulation that uses three index variables and we propose several families of inequalities, which can be used to reinforce the ...

    • A local multiple proper generalized decomposition based on the partition of unity 

      Ibáñez Pinillo, Rubén; Abisset Chavanne, Emmanuelle; Chinesta Soria, Francisco; Huerta, Antonio; Cueto Prendes, Elias (John Wiley & sons, 2019-10-12)
      Article
      Accés obert
      It is well known that model order reduction techniques that project the solution of the problem at hand onto alow-dimensional subspace present difficulties when this solution lies on a non-linear manifold. To overcomethese ...

    • A method of multiobjective decision making using a vector value function 

      Ríos Insúa, Sixto; González Pachón, Jacinto; Mateos, Alfonso (Institut d'Estadística de Catalunya, 1994)
      Article
      Accés obert
      A decision situation with partial information on preferences by means of a vector value function is assumed. The concept of minimum value dispersion solution as a reference point joined with a pseudodistance function from ...

    • A mixed-integer linear program for real-time train platforming management 

      Garcia Ródenas, Ricardo; López García, Maria Luz; Cadarso Morga, Luis; Codina Sancho, Esteve (Elsevier, 2022-03-11)
      Article
      Accés obert
      Unexpected events may perturb operations and generate conflicts that must be addressed promptly to limit delay propagation and other negative impacts on the network. The real-time railway traffic management problem deals ...

    • A model and an algorithm for the grouping problem in telecom networks 

      García, F.; Hackbarth, Klaus D. (Universitat Politècnica de Catalunya. Centre de Càlcul, 1991)
      Article
      Accés obert
      This paper deals with the so called grouping problem which arises in telecommunication network optimization when transmission equipment with a certain hierarchy is used. It is shown how this problem is embedded in the ...

    • A model for the simultaneous selection of bus lines and frequency setting problems in the expansion of public transit systems 

      Maureira Alegría, Grace Kelly; Codina Sancho, Esteve (Elsevier, 2020-03-02)
      Article
      Accés obert
      When expanding an existing public transport system a common practice consists of defining a set of candidate new lines andfrom them, choose those that will revert into a greater increase of the system’s performance while ...

    • A new optimal electricity market bid model solved through perspective cuts 

      Corchero García, Cristina; Mijangos Fernández, Eugenio; Heredia, F.-Javier (Francisco Javier) (Springer, 2013-04)
      Article
      Accés obert
      On current electricity markets the electrical utilities are faced with very sophisticated decision making problems under uncertainty. Moreover, when focusing in the short-term management, generation companies must include ...

    • A production planning problem in FMS 

      Escudero, L. F.; Pérez-Sainz de Rozas, G. (Universitat Politècnica de Barcelona. Centre de Càlcul, 1987)
      Article
      Accés obert
      We present in this work a hierarchical approach for generating alternatives for production planning in a generic floor shop problem within the environment of Flexible Manufacturing Systems (hereafter, FMS). Briefly, the ...

    • A Proper Generalized Decomposition (PGD) approach to crack propagation in brittle materials: with application to random field material properties 

      Garikapati, Hasini; Zlotnik, Sergio; Díez, Pedro; Verhoosel, Clemens V.; van Brummelen, Harald (Springer, 2020-02)
      Article
      Accés obert
      Understanding the failure of brittle heterogeneous materials is essential in many applications. Heterogeneities in materialproperties are frequently modeled through random fields, which typically induces the need to solve ...

    • A review of impact damage detection in structures using strain data 

      Mujica Delgado, Luis Eduardo; Rodellar Benedé, José; Vehí Casellas, José (2010)
      Article
      Accés obert
      This paper aims to provide a state-of-the-art review on impact damage detection techniques in structures using strain data. An overview of impact detection systems is provided. These include sensors, specimens, and impact ...

    • A semi-parametric joint model for two sequential times to events and one longitudinal covariate 

      Serrat Piè, Carles; Abel Huertas, Jaime; Gómez Melis, Guadalupe (2012)
      Comunicació de congrés
      Accés obert
      The present work proposes a joint model for two sequential times to events together with longitudinal information, as an extension of the joint model by Wolfsohn and Tsiatis (1997) for one time to event and one longitudinal ...

    • A simulation-enhanced lean design process 

      Marvel, Jon H.; Standrigde, Charles Robert (School of Industrial and Aeronautic Engineering of Terrassa (ETSEIAT). Universitat Politècnica de Catalunya (UPC), 2009-06)
      Article
      Accés obert
      A traditional lean transformation process does not validate the future state before implementation, relying instead on a series of iterations to modify the system until performance is satisfactory. An enhanced lean process ...

    • A stochastic congested strategy-based transit assignment model with hard capacity constraints 

      Codina Sancho, Esteve; Rosell Camps, Francisca (Elsevier, 2019-02-01)
      Article
      Accés obert
      This paper expands on the stochastic version of the strategy-based congested transit assignment problem described in Codina and Rosell (2017b), specifically by extending it to cases dealing with explicit line capacities. ...

    • A stochastic programming model for the optimal electricity market bid problem with bilateral contracts for thermal and combined cycle units 

      Heredia, F.-Javier (Francisco Javier); Rider Flores, Marcos Julio; Corchero García, Cristina (2008-10)
      Article
      Accés obert
      This paper developed a stochastic programming model that integrated the most recent regula- tion rules of the Spanish peninsular system for bilateral contracts in the day-ahead optimal bid problem. Our model allows a ...

    • 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
      Accés restringit per política de l'editorial
      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 ...