Blar i Institutt for marin teknikk på forfatter "Fagerholt, Kjetil"
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The Aquaculture Service Vessel Routing Problem with Time Dependent Travel Times and Synchronization Constraints
Lianes, Ingeborg Margrete; Noreng, Maren Theisen; Fagerholt, Kjetil; Slette, Hans Tobias; Meisel, Frank (Journal article; Peer reviewed, 2021)This paper studies the Aquaculture Service Vessel Routing Problem (ASVRP), which is an important planning problem arising in sea-based fish farming. In the ASVRP, there is a set of fish farms located in the sea, where each ... -
Benefits and Barriers using Operations Research based Decision Support Software in Dry Bulk Chartering
Garnås, Sindre Joakim (Master thesis, 2014)The objective of this thesis is to address the benefits and barriers in using operations research (OR) based decision support software (DSS) in the evaluation of cargo and vessel fixtures within dry bulk chartering. The ... -
Cost-Emission Relations for Maritime Logistics Support in Aquaculture
Slette, Hans Tobias; Asbjørnslett, Bjørn Egil; Fagerholt, Kjetil (Journal article; Peer reviewed, 2019)This paper presents a method for evaluation of the economic cost of reducing the emissions from a fleet operating in the aquaculture industry. The method accounts for the fact that different fleet compositions perform ... -
Effective utilization of service vessels in fish farming: Fleet design considering the characteristics of the locations
Slette, Hans Tobias; Asbjørnslett, Bjørn Egil; Fagerholt, Kjetil; Lianes, Ingeborg Margrete; Noreng, Maren Theisen (Peer reviewed; Journal article, 2022)Effective utilization of service vessels in sea-based fish farming requires that the vessels are suited to the operating environments at the fish farms. This paper presents a methodology for assessing service vessel fleet ... -
Emission Control Areas: Effect on the Fleet Renewal Problem
Sørgård, Ellen Helene (Master thesis, 2014)An important strategic planning problem in shipping is the fleet renewal problem. The purpose for liner shipping companies is to minimize the company's costs while finding the best way in which to develop a fleet over time ... -
Evaluating fleet effectiveness in tactical emergency response missions using a maximal covering formulation
Pettersen, Sigurd Solheim; Fagerholt, Kjetil; Asbjørnslett, Bjørn Egil (Peer reviewed; Journal article, 2019)This paper concerns the evaluation of alternative fleets of advanced special vessels, like coast guard or emergency response and rescue vessels. The paper proposes a mathematical programming formulation of the Fleet ... -
Evaluating port development strategies for a modal shift: a Norwegian case study
Ormevik, Andreas Breivik; Erikstad, Stein Ove; Fagerholt, Kjetil (Peer reviewed; Journal article, 2020)We study the design of a multi-modal distribution network for the transportation of incoming containers from a container terminal to nearby customer regions. The motivation for the study has been the relocation of the ... -
Impact of simulation model fidelity and simulation method on ship operational performance evaluation in sea passage scenarios
Nielsen, Jørgen Bremnes; Sandvik, Endre; Pedersen, Eilif; Asbjørnslett, Bjørn Egil; Fagerholt, Kjetil (Journal article; Peer reviewed, 2019)In this paper, we present and investigate important factors that influence a vessels fuel consumption during operation and what model fidelity that is required to adequately capture these factors in fuel consumption ... -
Maritime fleet composition under future greenhouse gas emission restrictions and uncertain fuel prices
Loennechen, Olav; Fagerholt, Kjetil; Lagemann, Benjamin; Stålhane, Magnus (Peer reviewed; Journal article, 2024)This paper studies the maritime fleet composition problem with uncertain future fuel and carbon prices under the restriction of complying with future greenhouse gas (GHG) emission restrictions. We propose a two-stage ... -
Maximizing the rate of return on the capital employed in shipping capacity renewal
Mørch, Ove; Fagerholt, Kjetil; Pantuso, Giovanni; Rakke, Jørgen Glomvik (Journal article; Peer reviewed, 2017)Decisions regarding investments in capacity expansion/renewal require taking into account both the operating fitness and the financial performance of the investment. While several operating requirements have been considered ... -
Mixed Integer Optimization of Battery Utilization in Machinery Configurations for Deep-Sea Liquefied Natural Gas and Floating Storage and Regasification Unit Operations
Justad, Andreas Malm (Master thesis, 2020) -
Operational sea passage scenario generation for virtual testing of ships using an optimization for simulation approach
Sandvik, Endre; Nielsen, Jørgen Bremnes; Asbjørnslett, Bjørn Egil; Pedersen, Eilif; Fagerholt, Kjetil (Peer reviewed; Journal article, 2020)In this paper, a model for implementation of sea passage operational scenarios in the context of simulation-based design of ships is presented. To facilitate the transition towards more energy-efficient shipping, the ability ... -
Optimal ship lifetime fuel and power system selection
Lagemann, Benjamin; Lindstad, Elizabeth; Fagerholt, Kjetil; Rialland, Agathe Isabelle; Erikstad, Stein Ove (Journal article; Peer reviewed, 2021) -
Resilience by Latent Capabilities in Marine Systems
Pettersen, Sigurd Solheim (Doctoral theses at NTNU;2018:394, Doctoral thesis, 2018)This thesis addresses the need for resilience, the ability of a system to recover from a disruption, in marine systems. It proposes to enhance resilience in the operational phase by taking advantage of latent capabilities, ... -
Supply Chain Design under Uncertainty: Locating LNG distribution centers in an emerging market with uncertain demand
Fekene, Marius Kongsfjell (Master thesis, 2014)According to the International Energy Agency, the global use of natural gas will increase dramatically in the next two to three decades. Due to factors ranging from national and international energy market regulations to ... -
The Fishing Vessel - Optimising Design and Functionality Based on Profit Optimisation of Fishery Selection, Routing and Change of Equipment Configuration
Vestre, Synne (Master thesis, 2020)Norsk fiskerinæring har de siste årene hatt en jevn økonomisk vekst, men en øvre grense på hvor mye havområdene tåler har blitt nådd. Norske myndigheter har derfor gitt norske fartøy større muligheter til å ta i bruk nye ... -
Using Optimization to Evaluate the Potential for Multimodal Cargo Distribution in a Regional Port
Ormevik, Andreas Breivik (Master thesis, 2020) -
Vessel Operations in Exposed Aquaculture: Achieving safe and efficient operation of vessel fleets in fish farm systems experiencing challenging metocean conditions
Slette, Hans Tobias (Doctoral theses at NTNU;2023:42, Doctoral thesis, 2023)Fartøysoperasjoner i eksponert havbruk Eksponert havbruk vil kreve at servicebåter brukt i havbruksnæringa er tilpasset mer krevende sjøkondisjoner enn i skjermede lokaliteter, slik at evne til å utføre marine operasjoner ...