• 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 Traveling Salesman Problem with Pickups and Deliveries and Stochastic Travel Times: An Application from Chemical Shipping 

      Elgesem, Aurora Smith; Skogen, Eline Sophie; Wang, Xin; Fagerholt, Kjetil (Journal article; Peer reviewed, 2018)
      This paper introduces a single-ship routing problem with stochastic travel times that is faced by a chemical shipping company in the Port of Houston. We take into explicit consideration the uncertain waiting times associated ...
    • 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 ...
    • Bidding in sequential electricity markets: The Nordic case 

      Boomsma, Trine Krogh; Juul, Nina; Fleten, Stein-Erik (Journal article; Peer reviewed, 2014)
      For electricity market participants trading in sequential markets with differences in price levels and risk exposure, it is relevant to analyze the potential of coordinated bidding. We consider a Nordic power producer who ...
    • Dynamic job assignment: A column generation approach with an application to surgery allocation 

      Range, Troels Martin; Kozlowski, Dawid; Petersen, Niels Christian (Journal article; Peer reviewed, 2018)
      We consider the assignment of jobs to heterogeneous agents in a dynamic system with a rolling time horizon. An example is a hospital operating theatre where the jobs are surgeries and the agents are the surgeons. The paper ...
    • An exact solution method for the capacitated item-sharing and crowdshipping problem 

      Behrend, Moritz; Meisel, Frank; Fagerholt, Kjetil; Andersson, Henrik (Peer reviewed; Journal article, 2019)
      The item-sharing and crowdshipping problem combines two concepts of the sharing economy, namely item-sharing and crowdshipping. Item-sharing is about renting items among members of a sharing community. Crowdshipping addresses ...
    • Hybrid heuristics for a short sea inventory routing problem 

      Agra, Agostinho; Christiansen, Marielle; Delgado, Alexandrino; Simonetti, Luidi (Journal article; Peer reviewed, 2014)
      We consider a short sea fuel oil distribution problem where an oil company is responsible for the routing and scheduling of ships between ports such that the demand for various fuel oil products is satisfied during the ...
    • Industrial and Tramp Ship Routing Problems: Closing the Gap for Real-Scale Instances 

      Homsi, Gabriel; Martinelli, Rafael; Vidal, Thibaut; Fagerholt, Kjetil (Peer reviewed; Journal article, 2019)
      Recent studies in maritime logistics have introduced a general ship routing problem and a benchmark suite based on real shipping segments, considering pickups and deliveries, cargo selection, ship-dependent starting ...
    • Inventory routing with pickups and deliveries 

      Archetti, Claudia; Christiansen, Marielle; Speranza, M. Grazia (Journal article; Peer reviewed, 2018)
      This paper introduces a class of problems which integrate pickup and delivery vehicle routing problems (PDPs) and inventory management, and we call them inventory routing problems with pickups and deliveries (IRP-PD). We ...
    • Maritime crude oil transportation – A split pickup and split delivery problem 

      Hennig, Frank; Nygreen, Bjørn; Christiansen, Marielle; Fagerholt, Kjetil; Furman, Kevin C; Song, Jinhwa; Kocis, Gary R; Warrick, Philip H (Journal article; Peer reviewed, 2012)
      The maritime oil tanker routing and scheduling problem is known to the literature since before 1950. In the presented problem, oil tankers transport crude oil from supply points to demand locations around the globe. The ...
    • Risk aversion in imperfect natural gas markets 

      Egging, Ruud; Pichler, Alois; Kalvø, Øyvind Iversen; Walle-Hansen, Thomas Meyer (Journal article; Peer reviewed, 2017)
      This paper presents a natural gas market equilibrium model that considers uncertainty in shale gas reserve exploration. Risk aversion is modeled using a risk measure known as the Average Value-at-Risk (also referred to as ...
    • Stochastic short-term hydropower planning with inflow scenario trees 

      Seguin, Sara; Fleten, Stein-Erik; Cote, Pascal; Pichler, Alois; Audet, Charles (Journal article; Peer reviewed, 2016)
      This paper presents an optimization approach to solve the short-term hydropower unit commitment and loading problem with uncertain inflows. A scenario tree is built based on a forecasted fan of inflows, which is developed ...
    • Structural Estimation of Switching Costs for Peaking Power Plants 

      Fleten, Stein-Erik; Haugom, Erik; Pichler, Alois; Ullrich, Carl J. (Journal article; Peer reviewed, 2019)
      We estimates costs associated with mothballing, restarting, abandoning and maintaining peaking power plants. We develop a real options model to explain switching and maintenance behavior of plant managers. The constrained ...
    • Switching from Oil to Gas Production in a Depleting Field 

      Støre, Kristian; Fleten, Stein-Erik; Hagspiel, Verena; Nunes, Cláudia (Journal article; Peer reviewed, 2018)
      We derive an optimal decision rule with regards to making an irreversible switch from oil to gas production. The approach can be used by petroleum field operators to maximize the value creation from a petroleum field with ...
    • Technology adoption in a declining market 

      Hagspiel, Verena; Huisman, Kuno J.M.; Kort, P.M.; Lavrutich, Maria; Nunes, Clàudia; Pimentel, Rita (Journal article; Peer reviewed, 2020)
      Rapid technological developments are inducing the shift in consumer demand from existing products towards new alternatives. When operating in a declining market, the profitability of incumbent firms is largely dependent ...