• 2D-packing with an application to stowage in Roll-on Roll-off liner shipping 

      Hansen, Jone; Hukkelberg, Ivar; Fagerholt, Kjetil; Stålhane, Magnus; Rakke, Jørgen Glomvik (Journal article; Peer reviewed, 2016-08-14)
      Roll-on/Roll-off (RoRo) ships represent the primary source for transporting vehicles and other types of rolling material over long distances. In this paper we focus on operational decisions related to stowage of cargoes ...
    • A New Formulation for the Combined Maritime Fleet Deployment and Inventory Management Problem 

      Dong, Bo; Bektas, Tolga; Chandra, Saurabh; Christiansen, Marielle; Fagerholt, Kjetil (Journal article; Peer reviewed, 2017-09-27)
      This paper addresses the fleet deployment problem and in particular the treatment of inventory in the maritime case. A new model based on time-continuous formulation for the combined maritime fleet deployment and inventory ...
    • A Shortest Path Heuristic for Evaluating the Quality of Stowage Plans in Roll-On Roll-Off Liner Shipping 

      Hansen, Jone R.; Fagerholt, Kjetil; Stålhane, Magnus (Journal article; Peer reviewed, 2017-09-27)
      Roll-on Roll-off shipping companies transport rolling cargo, such as cars, trucks and large construction machines. When sailing, this type of cargo must be attached to the deck using chains, to prevent damaging the cargo. ...
    • A vessel pickup and delivery problem from the disruption management in offshore supply vessel operations 

      Albjerk, Nils; Danielsen, Teodor; Krey, Stian; Stålhane, Magnus; Fagerholt, Kjetil (Journal article; Peer reviewed, 2016-06-10)
      This paper considers a vessel pickup and delivery problem that arises in the case of disruptions in the supply vessel logistics in the offshore oil and gas industry. The problem can be modelled as a multi-vehicle pickup ...
    • Maritime fleet deployment with speed optimization and voyage separation requirements 

      Borander, Venke; Straume, Anders; Dong, Bo; Fagerholt, Kjetil; Wang, Xin (Journal article; Peer reviewed, 2018-09-20)
      A shipping company operates a heterogeneous fleet of ships to service a given number of voyages on a number of trade routes over the planning horizon. Each ship has a predefined speed range within which it can sail. Fuel ...
    • Offshore supply planning in a rolling time horizon 

      Fernandez Cuesta, Eirik; Andersson, Henrik; Fagerholt, Kjetil (Journal article; Peer reviewed, 2018-09-20)
      This paper presents a real transportation problem stemming from offshore oil and gas logistics and shows how optimization models used in a rolling horizon simulation framework can be very valuable to assess and improve the ...
    • Visualizing Cyber Security Risks with Bow-Tie Diagrams 

      Bernsmed, Karin; Frøystad, Christian; Meland, Per Håkon; Nesheim, Dag Atle; Rødseth, Ørnulf Jan (Journal article; Peer reviewed, 2018-01-19)
      Safety and security risks are usually analyzed independently, by different people using different tools. Consequently, the system analyst may fail to realize cyber attacks as a contributing factor to safety impacts or, on ...