Now showing items 1-20 of 25

    • A branch-and-cluster coordination scheme for selecting prison facility sites under uncertainty 

      Hernández, Patricio; Alonso-Ayuso, Antonio; Bravo, Fernanda; Escudero, Laureano F.; Guignard, Monique; Marianov Kluge, Vladimir; Weintraub Pohorille, Andrés (PERGAMON-ELSEVIER, 2012-09)
      A multi-period stochastic model and an algorithmic approach to location of prison facilities under uncertainty are presented and applied to the Chilean prison system. The problem consists of finding locations and sizes of ...
    • A multicriteria optimization model for sustainable forest management under climate change uncertainty:an application in Portugal 

      Alvarez Miranda, Eduardo; García Gonzalo, Jordi; Ulloa Fierro, Felipe; Weintraub Pohorille, Andrés; Barreiro, Susana (Elsevier, 2018-08-16)
      We propose a multicriteria decision-making framework to support strategic decisions in forest management, taking into account uncertainty due to climate change and sustainability goals. In our setting, uncertainty is modeled ...
    • A Strategic Empty Container Logistics Optimization in a Major Shipping Company 

      Epstein Numhauser, Rafael; Neely, Andrés; Weintraub Pohorille, Andrés; Valenzuela, Fernando; Hurtado, Sergio; González, Guillermo; Beiza, Alex; Naveas, Mauricio; Infante, Florencio; Alarcón, Fernando; Angulo, Gustavo; Berner, Cristián; Catalán, Jaime; González, Cristián; Yung, Daniel (2012-02)
      In this paper, we present a system that Compañía Sud Americana de Vapores (CSAV), one of the world’s largest shipping companies, developed to support its decisions for repositioning and stocking empty containers. CSAV’s ...
    • Accounting for climate change in a forest planning stochastic optimization model 

      García Gonzalo, Jordi; Pais, Cristóbal; Bachmatiuk, Joanna; Weintraub Pohorille, Andrés (Canadian Science, 2016)
      An approach is proposed for incorporating the variations in timber growth and yield due to climate change uncertainty into the forest harvesting decision process. A range of possible climate scenarios are transformed by a ...
    • An approach for efficient ship routing 

      Romero, Gonzalo; Durán Maggiolo, Guillermo; Marenco, Javier; Weintraub Pohorille, Andrés (John Wiley & Sons, 2013)
      Ship routing problems are a particular kind of routing problems where the vehicles to be routed are vessels or ships, usually in maritime environments. In contrast to land routing, ship routing has unique features, including ...
    • Branch-and-price and constraint programming for solving a real-life technician dispatching problem 

      Cortés Carrillo, Cristián; Gendreau, Michel; Rousseau, Louis Martin; Souyris, Sebastián; Weintraub Pohorille, Andrés (Elsevier, 2014)
      We consider a real problem faced by a large company providing repair services of office machines in Santiago, Chile. In a typical day about twenty technicians visit seventy customers in a predefined service area in ...
    • Brief history of systems analysis in forest resources 

      Bruce Bare, B.; Weintraub Pohorille, Andrés (Springer, 2015)
      An introduction to the special volume on Operations Research in Forestry from the 14th Symposium for Systems Analysis in Forest Resources, held at the Marbella Resort, Maitencillo, Chile, March 8–11, 2011. This volume ...
    • Building a stochastic programming model from scratch: a harvesting management example 

      Rios Uribe, Ignacio; Weintraub Pohorille, Andrés; Wets, Roger (Routledge, 2016)
      We analyse how to deal with the uncertainty before solving a stochastic optimization problem and we apply it to a forestry management problem. In particular, we start from historical data to build a stochastic process for ...
    • A combinatorial heuristic approach for solving real-size machinery location and road design problems in forestry planning 

      Epstein Numhauser, Rafael; Weintraub Pohorille, Andrés; Sapunar, Pedro; Nieto, Enrique; Sessions, Julian B.; Sessions, John; Bustamante, Fernando; Musante, Hugo (INST OPERATIONS RESEARCH MANAGEMENT SCIENCES, 2006-12)
      The location and operation of harvest machinery, along with the design and construction of access roads, are important problems faced by forestry planners, making up about 55% of total production costs. One of the main ...
    • Introduction to the interfaces special issue on operations research in mining 

      Newman, Alexandra; Weintraub Pohorille, Andrés (INFORMS, 2014)
      This special issue in mining presents surveys and applications. Specifically, in the former category, the issue contains a tutorial on open-pit mine-scheduling models, a literature review on equipment selection, and ...
    • Mathematical models for optimizing production chain planning in salmon farming 

      Bravo, Fernanda; Durán Maggiolo, Guillermo; Lucena, Abilio; Marenco, Javier; Morán, Diego; Weintraub Pohorille, Andrés (John Wiley, 2013)
      The salmon farming production chain is structured in four consecutive phases: freshwater, seawater, plant processing, and distribution and marketing. The phases interact in a pull manner, freshwater stocks fish to meet ...
    • Medium range optimization of copper extraction planning under uncertainty in future copper prices 

      Alonso-Ayuso, Antonio; Carvallo Löhr, Luis Felipe; Escudero, Laureano F.; Guignard, Monique; Pi, Jiaxing; Puranmalka, Raghav; Weintraub Pohorille, Andrés (Elsevier, 2014)
      Deterministic mine planning models along a time horizon have proved to be very effective in supporting decisions on sequencing the extraction of material in copper mines. Some of these models have been developed for, and ...
    • A mixed integer programming model to evaluate integrating strategies in the forest value chain - a case study in the Chilean forest industry 

      Troncoso, Juan; D'Amours, Sophie; Flisberg, Patrik; Roennqvist, Mikael; Weintraub Pohorille, Andrés (Canadian Science Publishing, 2015)
      When a company is integrated vertically, it can manage and plan its overall value chain in one direct and integrated approach. However in many cases, companies follow a decoupled approach where forests and production plants ...
    • Operations Research challenges in forestry: 33 open problems 

      Ronnqvist, Mikael; D’Amours, Sophie; Weintraub Pohorille, Andrés; Jofré, Alejandro; Gunn, Eldon; Haight, Robert G.; Martell, David; Murray, Alan T.; Romero, Carlos (Springer, 2015)
      Forestry has contributed many problems to the Operations Research (OR) community. At the same time, OR has developed many models and solution methods for use in forestry. In this article, we describe the current status ...
    • Operations research in the natural resource industry 

      Bjorndal, T.; Herrero, I.; Newman, A.; Romero, C.; Weintraub Pohorille, Andrés (WILEY-BLACKWELL, 2012-03)
      Operations research is becoming increasingly prevalent in the natural resource sector, specifically in agriculture, fisheries, forestry and mining. While there are similar research questions in these areas, e. g., how to ...
    • Operations research models and the management of agricultural and forestry resources: A review and comparison 

      Weintraub Pohorille, Andrés; Romero, Carlos (INST OPERATIONS RESEARCH MANAGEMENT SCIENCES, 2006-10)
      Operations research (OR) has helped people to understand and manage agricultural and forestry resources during the last 40 years. We analyzed its use to assess the past performance of OR models in this field and to highlight ...
    • Operations research transforms the scheduling of chilean soccer leagues and south American world cup qualifiers 

      Alarcón, Fernando; Durán, Guillermo; Guajardo, Mario; Miranda Pino, Jaime; Muñoz, Hugo; Ramírez, Luis; Ramírez, Mario; Sauré Valenzuela, Denis; Siebert, Matías; Souyris, Sebastián; Weintraub Pohorille, Andrés; Wolf Yadlin, Rodrigo; Zamorano, Gonzalo (INFORMS, 2017)
      For the past 12 years, the Chilean Professional Soccer Association (ANFP) hasapplied operations research (OR) techniques to schedule soccer leagues in Chile. Usinginteger programming-based methods, the ANFP decides which ...
    • The optimal rotation of a flammable forest stand when both carbon sequestration and timber are valued: a multi-criteria approach 

      Díaz Balteiro, Luis; Martell, David L.; Romero, Carlos; Weintraub Pohorille, Andrés (Springer Science+Business Media, 2014)
      This paper proposes a multi-criteria approach that accounts for the risk of fire when determining the optimal rotation of a forest stand that is being managed for both timber production and carbon sequestration purposes. ...
    • Optimizing Long-Term Production Plans in Underground and Open-Pit Copper Mines 

      Epstein Numhauser, Rafael; Goic Figueroa, Marcel; Weintraub Pohorille, Andrés; Catalán, Jaime; Santibáñez, Pablo; Urrutia, Rodolfo; Cancino, Raúl; Gaete, Sergio; Aguayo, Augusto; Caro Valdés, Felipe (2012-02)
      We present a methodology for long-term mine planning based on a general capacitated multicommodity network flow formulation. It considers underground and open-pit ore deposits sharing multiple downstream processing plants ...
    • Review of combinatorial problems induced by spatial forest harvesting planning 

      Weintraub Pohorille, Andrés; Murray, Alan T. (ELSEVIER, 2006-04-01)
      In the last two decades forest planning and management has become very much focused on spatially oriented decisions, due to the introduction of spatial details, such as road building, and environmental concerns, like ...