• A hybrid method based on linear programming and tabu search for routing of logging trucks 

      Flisberg, Patrik; Lidén, Bertil; Rönnqvist, Mikael (Discussion paper, Working paper, 2007)
      In this paper, we consider an operational routing problem to decide the daily routes of logging trucks in forestry. The industrial problem is difficult and includes aspects such as pickup and delivery with split pickups, ...
    • Integrated planning of production, inventory and ship loading at refineries 

      Bengtsson, Jens; Flisberg, Patrik; Rönnqvist, Mikael (Report;2010:26, Research report, 2010-12)
      Refinery operation planning is a complex task since refinery processes and inventories are tightly interconnected. We study deterministic refinery planning when ships are loaded with a blend of components. Any delay in ...
    • Optimized on-line process control of bleaching operations with OptCab 

      Flisberg, Patrik; Nilsson, Stefan; Rönnqvist, Mikael (Discussion paper, Working paper, 2007)
      To produce pulp for paper production or as market pulp is a complicated on-line process with many integrated stages that impact the final quality. In the bleaching plant which is at the end of pulp production, the main ...
    • 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 ...
    • RuttOpt : a decision support system for routing of logging trucks 

      Andersson, Gert; Flisberg, Patrik; Lidén, Bertil; Rönnqvist, Mikael (Discussion paper, Working paper, 2007)
      We describe the decision support system RuttOpt, which is developed for scheduling logging trucks in the Swedish forest industry. The system is made up of a number of modules. One module is the Swedish road database NVDB ...
    • 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 ...