• An Educational Game in Collaborative Logistics 

      D'Amours, Sophie; Rönnqvist, Mikael (Journal article; Peer reviewed, 2013)
      We describe an educational game in collaborative logistics. The game is based on an award-winning application in cost allocation in transportation. The purpose of the game is to acquire an understanding of negotiation, ...
    • Backhauling in forest transportation : models, methods and practical usage 

      Carlsson, Dick; Rönnqvist, Mikael (Discussion paper, Working paper, 2006)
      Transportation planning in forestry is divided into strategic, tactical and operational depending on the length of the planning horizon. We consider a tactical problem of finding efficient backhauling routes. Given a set ...
    • 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 ...
    • Cost allocation in collaborative forest transportation 

      Frisk, Mikael; Göthe-Lundgren, Maud; Jörnsten, Kurt; Rönnqvist, Mikael (Discussion paper, Working paper, 2006)
      Transportation planning is an important part of the wood flow chain in forestry. There are often several forest companies operating in the same region and co-ordination between two or more companies is rare. However, there ...
    • Hvorfor samarbeide? 

      Audy, Jean-Francois; Lehoux, Nadia; D'Amours, Sophie; Rönnqvist, Mikael (Journal article; Peer reviewed, 2011)
      Mange bedrifter ser på samarbeid som en mulighet til å styrke sin egen konkurransekraft, få tilgang til nye markeder og innfri operasjonelle, samfunnsmessige og miljørelaterte krav og restriksjoner. Samtidig har hver enkelt ...
    • 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, ...
    • Incitements for transportation collaboration by cost allocation 

      Dahlberg, Joen; Engevall, Stefan; Göthe-Lundgren, Maud; Jørnsten, Kurt; Rönnqvist, Mikael (Journal article; Peer reviewed, 2018)
      In this paper, we focus on how cost allocation can be used as a means to create incentives for collaboration among companies, with the aim of reducing the total transportation cost. The collaboration is assumed to be ...
    • 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 ...
    • Inventory management of spare parts in an energy company 

      Guajardo, Mario; Rönnqvist, Mikael; Halvorsen, Ann Mari; Kallevik, Svein Inge (Discussion paper;06/12, Working paper, 2012-06)
      We address a problem of inventory management of spare parts in the context of a large energy company, producer of oil and gas. Spare parts are critical for assuring operational conditions in offshore platforms. About ...
    • Issues in collaborative logistics 

      D’Amours, Sophie; Rönnqvist, Mikael (Report, Research report, 2008-11)
      Collaborative logistics is becoming more important in today’s industry. This is driven by increased environ-mental concerns, improved efficiency through collaborative planning supporting resources sharing and new business ...
    • Modeling an integrated market for sawlogs, pulpwood and forest bioenergy 

      Kong, Jiehong; Rönnqvist, Mikael; Frisk, Mikael (Discussion paper;2011:11, Working paper, 2011-06)
      Traditionally, most applications in the initial stage of forest supply chain deal with sawlogs to sawmills, pulpwood to pulp or paper mills and forest residues to heating plants. However, in the past decades, soaring ...
    • 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 ...
    • Optimal heating of large block of flats 

      Gustafsson, Stig-Inge; Rönnqvist, Mikael (Discussion paper, Working paper, 2007)
    • 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 ...
    • 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 ...