variable neighbourhood search

Building separating concentric balls to solve a multi-instance classification problem

  • Emilio Carrizosa
  • José F. Gordillo
  • Frank Plastria
    • Categories (Mixed) Integer Nonlinear Programming, Data-Mining, Meta Heuristics Tags , , ,

    In this work, we consider a classification problem where the objects to be classified are bags of instances which are vectors measuring d different attributes. The classification rule is defined in terms of a ball, whose center and radius are the parameters to be computed. Given a bag, it is assigned to the positive class … Read more

    Covering models with time-dependent demand

  • Emilio Carrizosa
  • José F. Gordillo
  • Dolores R. Santos-Peñate
    • Categories Applications - OR and Management Sciences, Finance and Economics, Meta Heuristics Tags , , , ,

    In this paper a covering model for locating facilities with time-dependent demand is introduced. Not only the facility locations, but also the instants at which such facilities become operative, are considered as decision variables in order to determine the maximal-profit decision. Expressed as a mixed nonlinear integer program, structural properties are derived for particular demand … Read more