• Adaptive large neighborhood search heuristics for multi-tier service deployment problems in clouds 

      Gullhav, Anders Nordby; Cordeau, Jean-Francois; Hvattum, Lars Magnus; Nygreen, Bjørn (Journal article; Peer reviewed, 2016)
      This paper proposes adaptive large neighborhood search (ALNS) heuristics for two service deployment problems in a cloud computing context. The problems under study consider the deployment problem of a provider of ...
    • A maritime inventory routing problem with stochastic sailing and port times 

      Agra, Agostinho; Christiansen, Marielle; Delgado, Alexandrino; Hvattum, Lars Magnus (Journal article; Peer reviewed, 2015)
      This paper describes a stochastic short sea shipping problem where a company is responsible for both the distribution of oil products between islands and the inventory management of those products at consumption storage ...
    • A Multi-Stage Stochastic Facility Routing Model for Humanitarian Logistics Planning 

      Rø, Kristina Fougner; Rennemo, Sigrid Johansen (Master thesis, 2012)
      This thesis presents a humanitarian logistics decision model to be used in the event of a disaster. The operations under consideration span from opening of local distribution facilities and initial allocation of supplies, ...
    • An effective heuristic for solving a combined cargo and inventory routing problem in tramp shipping 

      Hemmati, Ahmad; Stålhane, Magnus; Hvattum, Lars Magnus; Andersson, Henrik (Journal article; Peer reviewed, 2015)
      In this paper a vendor managed inventory (VMI) service in tramp shipping is considered. VMI takes advantage of introducing flexibility in delivery time and cargo quantities by transferring inventory management and ordering ...
    • A Price-Based Algorithm for Multi-Player Equilibrium Problems 

      Wilthil, Mads Falmår; Rasmussen, Pål Eskild (Master thesis, 2015)
      This thesis is about improving the solution time for energy market equilibrium models. Equilibrium models have seen an increased usage over the last years, and the models used for numerical analysis are growing larger and ...
    • A Strategic Tool for Competence Building within the Health Sector: With the Use of Nurse Rerostering 

      Lilleby, Hilde Elise Sæther (Master thesis, 2012)
      Implementing a model of competence building in the XpressMP and building a case based on a simplified version of a hospital gave room for computational studies. A lower amount of nurse rotation lead to lower cost of external ...
    • A survey on maritime fleet size and mix problems 

      Pantuso, Giovanni; Fagerholt, Kjetil; Hvattum, Lars Magnus (Journal article; Peer reviewed, 2014-06-01)
      This paper presents a literature survey on the fleet size and mix problem in maritime transportation. Fluctuations in the shipping market and frequent mismatches between fleet capacities and demands highlight the relevance ...
    • A survey on maritime fleet size and mix problems 

      Pantuso, Giovanni; Fagerholt, Kjetil; Hvattum, Lars Magnus (Journal article, 2013)
      This paper presents a literature survey on the fleet size and mix problem in maritime transportation. Fluctuations in the shipping market and frequent mismatches between fleet capacities and demands highlight the relevance ...
    • A three-stage stochastic facility routing model for disaster response planning 

      Rennemo, Sigrid Johansen; Rø, Kristina Fougner; Hvattum, Lars Magnus; Tirado, Gregorio (Journal article; Peer reviewed, 2014)
      This paper presents a three-stage mixed-integer stochastic programming model for disaster response planning, considering the opening of local distribution facilities, initial allocation of supplies, and last mile distribution ...
    • Benchmark Suite for Industrial and Tramp Ship Routing and Scheduling Problems 

      Hemmati, Ahmad; Hvattum, Lars Magnus; Fagerholt, Kjetil; Norstad, Inge (Journal article; Peer reviewed, 2014-07-01)
      This paper considers a class of cargo ship routing and scheduling problems from industrial and tramp shipping and presents a wide range of benchmark instances that have been created to represent realistic planning problems ...
    • Benchmark Suite for Industrial and Tramp Ship Routing and Scheduling Problems 

      Hemmati, Ahmad; Hvattum, Lars Magnus; Fagerholt, Kjetil; Norstad, Inge (Journal article; Peer reviewed, 2014)
      This paper considers a class of cargo ship routing and scheduling problems from industrial and tramp shipping and presents a wide range of benchmark instances that have been created to represent realistic planning problems ...
    • Determining the Optimal Vessel Fleet for Maintenance of Offshore Wind Farms 

      Vefsnmo, Hanne Merete (Master thesis, 2013)
      Today the offshore wind energy industry needs financial support to be profitable.For offshore wind farms to be more competitive against other energy sources, thecosts must be reduced, and this may be achieved by increasing ...
    • Evaluating Association Football Player Performances Using Markov Models 

      Haave, Haakon Sveiverud; Høiland, Håkon (Master thesis, 2017)
      Historically, association football player performance evaluation has been based on subjective opinions and intuition, which is subject to cognitive bias. This thesis develops data driven player ratings, argued to tend ...
    • Fleet Deployment Optimization in Liner Shipping 

      Steen, Sondre Morten (Master thesis, 2012)
      This thesis presents a study of a real fleet deployment problem in liner shipping. In the context of data from Saga Forest Carriers and actual contracts between charterers and shipping companies, an optimization model is ...
    • Heuristics for a Dual-Level Stochastic Fleet Size and Mix Problem for Maintenance Operations at Offshore Wind Farms 

      Joshi, Manu; Bolstad, Kamilla Hamre (Master thesis, 2016)
      Due to high costs, the offshore wind industry is currently not economically viable on its own. For offshore wind to be a profitable future energy source, it is therefore necessary to find methods for reducing costs. ...
    • Heuristics for dynamic and stochastic routing in industrial shipping 

      Tirado, Gregorio; Hvattum, Lars Magnus; Fagerholt, Kjetil; Cordeau, Jean-François (Journal article; Peer reviewed, 2012)
      Maritime transportation plays a central role in international trade, being responsible for the majority of long-distance shipments in terms of volume. One of the key aspects in the planning of maritime transportation systems ...
    • Heuristics for dynamic and stochastic routing in industrial shipping 

      Tirado, Gregorio; Hvattum, Lars Magnus; Fagerholt, Kjetil; Cordeau, Jean-François (Journal article; Peer reviewed, 2013-01)
      Maritime transportation plays a central role in international trade, being responsible for the majority of long-distance shipments in terms of volume. One of the key aspects in the planning of maritime transportation systems ...
    • Heuristics for the robust vehicle routing problem with time windows 

      Braaten, Simen V.; Gjønnes, Ola; Hvattum, Lars Magnus; Tirado, Gregorio (Journal article; Peer reviewed, 2017)
      Uncertainty is frequently present in logistics and transportation, where vehicle routing problems play a crucial role. However, due to the complexity inherent in dealing with uncertainty, most research has been devoted to ...
    • Introducing profit maximization in inventory routing problems 

      Zaitseva, Anna (Master thesis, 2017)
    • Layered Formulation for the Robust Vehicle Routing Problem with Time Windows 

      Agra, Agostinho; Christiansen, Marielle; Figueiredo, Rosa; Hvattum, Lars Magnus; Poss, Michael; Requejo, Cristina (Journal article; Peer reviewed, 2012)
      This paper studies the vehicle routing problem with time windows where travel times are uncertain and belong to a predetermined polytope. The objective of the problem is to find a set of routes that services all nodes of ...