Ana Viana

The probabilistic travelling salesman problem with crowdsourcing

  • Alberto Santini
  • Ana Viana
  • Xenia Klimentova
  • João Pedro Pedroso
    • Categories Stochastic Programming, Supply Chain Management Tags , ,

    We study a variant of the Probabilistic Travelling Salesman Problem arising when retailers crowdsource last-mile deliveries to their own customers, who can refuse or accept in exchange for a reward. A planner must identify which deliveries to offer, knowing that all deliveries need fulfilment, either via crowdsourcing or using the retailer’s own vehicle. We formalise … Read more

    Unit commitment with valve-point loading effect

  • Mikio Kubo
  • João Pedro Pedroso
  • Ana Viana
    • Categories Applications - OR and Management Sciences, Production and Logistics, Scheduling Tags , , ,

    Valve-point loading affects the input-output characteristics of generating units, bringing the fuel costs nonlinear and nonsmooth. This has been considered in the solution of load dispatch problems, but not in the planning phase of unit commitment. This paper presents a mathematical optimization model for the thermal unit commitment problem considering valve-point loading. The formulation is … Read more