Blar i NHH Brage på forfatter "Bredström, David"

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    • A branch and price algorithm for the combined vehicle routing and scheduling problem with synchronization constraints 

      Bredström, David; Rönnqvist, Mikael (Discussion paper, Working paper, 2007)
      In this paper we present a branch and price algorithm for the combined vehicle routing and scheduling problem with synchronization constraints. The synchronization constraints are used to model situations when two or more ...

    • Combined vehicle routing and scheduling with temporal precedence and synchronization constraints 

      Bredström, David; Rönnqvist, Mikael (Discussion paper, Working paper, 2006)
      We present a mathematical programming model for the combined vehicle routing and scheduling problem with time windows and additional temporal constraints. The temporal constraints allow for imposing pairwise synchronization ...

    • Coordination of refinery production and sales planning 

      Bredström, David; Rönnqvist, Mikael (Report, Research report, 2008-11)
      Coordination of activities in the supply chain is important in order improve the overall performance. The best approach is to use integrated planning of such activities. However, in many cases it is not possible to use ...

    • A new method for robustness in rolling horizon planning 

      Bredström, David; Rönnqvist, Mikael (Report, Research report, 2008-11)
      In this paper we describe a new method to solve Linear Programming (LP) problems with uncertain parameters. We apply this to planning problems where a rolling planning horizon is used. The method is based on a decomposition ...

    • Refinery optimization platform : a user’s manual : version 1.0 

      Bredström, David; Flisberg, Patrik; Rud, Linda; Rönnqvist, Mikael (Report, Research report, 2008-11)
      This is a manual for the Refinery Optimization Platform ROP which is a flexible platform for studying refinery production planning. The user can model the overall refining process in a multiperiodic setting, with linear ...

    • Refinery production planning : model and solution method 

      Bredström, David; Flisberg, Patrik; Rönnqvist, Mikael (Report, Research report, 2008-11)
      In this paper we present a general model and solution approach for refinery process planning. The model is nonlinear and has a flexible description to account for different configurations at a refinery. The solution approach ...

    • Searching for optimal integer solutions to set partitioning problems using column generation 

      Bredström, David; Jörnsten, Kurt; Rönnqvist, Mikael (Discussion paper;20/07, Working paper, 2007-08)
      We describe a new approach to produce integer feasible columns to a set partitioning problem directly in solving the linear programming (LP) relaxation using column generation. Traditionally, column generation is aimed ...

    • Simulation of production and sales planning in refinery operations 

      Bredström, David; Flisberg, Patrik; Rönnqvist, Mikael (Report, Research report, 2008-11)
      In this paper we discuss some computational experiments on simulating refinery operations. We compare an integrated approach with recursively solving a production planning and sales planning problem. We test two different ...

    • Supply Chain Optimization in Pulp Distribution using a Rolling Horizon Solution Approach 

      Bredström, David; Rönnqvist, Mikael (Discussion paper, Working paper, 2006)
      In this paper we consider a combined supply chain and ship routing problem for a large pulp producer in Scandinavia. The problem concerns the distribution of pulp to customers, with route scheduling of ships as a central ...