• A branch and price approach for deployment of multi-tier software services in clouds 

      Gullhav, Anders Nordby; Nygreen, Bjørn (Journal article; Peer reviewed, 2016)
      This paper considers a service deployment problem that combines service placement and replication level decisions in a cloud computing context. The services are composed of multiple components that are to be placed on nodes ...
    • 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 shortest-path-based approach for the stochastic knapsack problem with non-decreasing expected overfilling costs 

      Range, Troels Martin; Kozlowski, Dawid; Petersen, Niels Christian (Journal article; Peer reviewed, 2018)
      The knapsack problem (KP) is concerned with the selection of a subset of multiple items with known positive values and weights such that the total value of selected items is maximized and their total weight does not exceed ...
    • A two-phase heuristic for an in-port ship routing problem with tank allocation 

      Wang, Xin; Arnesen, Mari Jevne; Fagerholt, Kjetil; Gjestvang, Magnhild; Thun, Kristian (Journal article; Peer reviewed, 2017)
      This paper addresses an in-port ship routing problem with tank allocation that arises in the chemical shipping industry. The aim is to optimize a tanker’s port call operation that integrates sequencing decisions for visiting ...
    • 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 ...
    • Bi-objective offshore supply vessel planning with costs and persistence objectives 

      Borthen, Thomas; Loennechen, Henrik; Fagerholt, Kjetil; Wang, Xin; Vidal, Thibault (Journal article; Peer reviewed, 2019)
      This paper introduces a bi-objective model for the offshore supply vessel planning problem (SVPP) in the oil & gas industry. The SVPP consists of determining a new weekly plan for sailing the platform supply vessels whenever ...
    • 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 ...
    • Optimal Charging and Repositioning of Electric Vehicles in a Free-Floating Carsharing System 

      Folkestad, Carl Axel Aadne; Hansen, Nora Åsheim; Fagerholt, Kjetil; Andersson, Henrik; Pantuso, Giovanni (Journal article; Peer reviewed, 2019)
      Carsharing has received increased attention from the Operations Research community in recent years. Currently, many systems are adopting electric vehicles that require charging when battery levels fall below a given level. ...
    • Scheduling two-way ship traffic for the Kiel Canal: Model, extensions and a matheuristic 

      Meisel, Frank; Fagerholt, Kjetil (Peer reviewed; Journal article, 2019)
      The Kiel Canal is an artificial waterway of about 100 km that connects the North Sea and the Baltic Sea. It allows ships to save several hundred kilometers of travel distance compared with going around the Jutland Peninsula ...
    • 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, 2013)
      This paper addresses the robust vehicle routing problem with time windows. We are motivated by a problem that arises in maritime transportation where delays are frequent and should be taken into account. Our model only ...