• 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 ...
    • Common mistakes in computing the nucleolus 

      Guajardo, Mario; Jörnsten, Kurt (Discussion paper;15/14, Working paper, 2014-04)
      Despite linear programming and duality have correctly been incorporated in algorithms to compute the nucleolus, we have found mistakes in how these have been used in a broad range of applications. Overlooking the fact ...
    • 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 ...
    • 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, ...
    • Lower and upper bounds for linear production 

      Bjørndal, Endre; Jörnsten, Kurt (Discussion paper, Working paper, 2002-11)
      We study a model of a production economy in which every set of agents owns a set of resources, and where they all have access to the same technology. The agents can cooperate by pooling their resources, and the total profit ...
    • Speciality oils supply chain optimization: from a decoupled to an integrated planning approach 

      Guajardo, Mario; Kylinger, Martin; Rönnqvist, Mikael (Discussion paper;03/12, Working paper, 2012-03)
      We study a problem of tactical planning in a divergent supply chain. It involves decisions regarding production, inventory, internal transportation, sales and distribution to customers. The problem is motivated by the ...