• 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 ...
    • 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 ...
    • An Optimization-Based Approach to Facility Layout Planning in Hospitals 

      Kvillum, Vilde Nielsen; Vigerust, Anne Marit Rørholt (Master thesis, 2018)
      There are several major decisions involved when building a hospital. The purpose of the hospital needs to be established, and the associated departments that will constitute the hospital need to be determined. Also, the ...
    • Block scheduling at magnetic resonance imaging labs 

      Gullhav, Anders N.; Christiansen, Marielle; Nygreen, Bjørn; Aarlott, Mats Mathisen; Medhus, Jon Erik; Skomsvoll, Johan Fredrik; Østbyhaug, Per Olav (Journal article; Peer reviewed, 2017)
      This paper considers a tactical block scheduling problem at a major Norwegian hospital. Here, specific patient groups are reserved time blocks for scanning at a heterogeneous set of Magnetic Resonance Imaging (MRI) labs. ...
    • Compression and expansion at the right pinch temperature 

      Fu, Chao; Uv, Preben Maurstad; Nygreen, Bjørn; Gundersen, Truls (Journal article; Peer reviewed, 2017)
      Heat Integration is extended to the topic of Heat and Work Integration when pressure changing equipment such as compressors and expanders are included in heat exchanger network design. The latter topic is much more complex ...
    • Compression and Expansion at the Right Pinch Temperature 

      Fu, Chao; Uv, Preben Maurstad; Nygreen, Bjørn; Gundersen, Truls (Chapter, 2017)
      Heat Integration is extended to the topic of Heat and Work Integration when pressure changing equipment such as compressors and expanders are included in heat exchanger network design. The latter topic is much more complex ...
    • Decision support for tonnage allocation in dry bulk liner shipping 

      Flateby, Oydis Kristine (Master thesis, 2013)
      Maritime transportation represents the major transportation mode of international trade and the world seaborne trade continues to grow. There exists however an oversupply of ships representing a serious challenge for ship ...
    • Emergency Department Layout Planning Using A Simulation And Optimization Approach 

      Berdal, Tore Bjørseth; Nydal, Erlend Moian (Master thesis, 2020)
      Flere faktorer påvirker hvordan et akuttmottak fungerer, blant annet dyktige ansatte, tilstrekkelig kapasitet av ressurser og ansatte, fornuftig arbeidsfordeling samt gode planer for å håndtere kritiske situasjoner. Men, ...
    • Heuristic solution approach to simultaneous optimization of heat and work integration - A two-level optimization model using genetic algorithms to establish the energy target for maximum heat and work recovery 

      Borge, Kari Sofie Hall (Master thesis, 2017)
      Heat integration is of significant importance to the process industry in the efforts of reducing energy consumption and total annual costs. The heat integration problem attempts finding the optimal interconnections of ...
    • 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 ...
    • Optimal design of heat exchanger networks with pressure changes. 

      Uv, Preben Maurstad (Master thesis, 2016)
      Due to climate change is it desirable to improve the energy efficiency of production systems. The environmental impact will decrease with increasing energy efficiency and it will even reduce the operational cost. Heat ...
    • Optimization based design of an IRCC process with CO2 capture 

      Johnsen, Erik Lien (Master thesis, 2011)
      To deal with the threat of climate change, many technologies should be investigated, and power generation through an IRCC with CO2 capture is one alternative. However, capturing CO2 has a negative effect on the efficiency ...
    • Optimization of membrane systems for post-combustion CO2 capture 

      Johnsen, Niklas Sparr (Master thesis, 2015)
      The increasing threat of climate change due to human emissions of global greenhouse gases has led to investigation of several technologies to mitigate such emissions from large point sources. One of these technologies is ...
    • Optimization-based Resource Allocation in Cloud Computing 

      Gullhav, Anders Nordby (Doctoral thesis at NTNU;2016:39, Doctoral thesis, 2016)
      This thesis considers the resource allocation problem of a cloud service provider (SP), which provides at set of services delivered through the software-as-a-service model. The SP owns and operates a private cloud, but in ...
    • Service Brokering in Cloud Computing 

      Holmen, Mari; Braaten, Sindre Møgster (Master thesis, 2014)
      AbstractWith the expanding cloud computing market new business models take form, and the focus in the market is on differentiation and adapting to the escalating demands of the customers. To satisfy the business segment ...
    • Service Deployment in Heterogeneous Cloud-like Environments 

      Gullhav, Anders Nordby (Master thesis, 2011)
      The amount of power consumed by data centres world wide is increasing, and due to growing electricity bills, service providers aim more attention on energy-efficient management of their data centres. In order to achieve ...
    • Simulation Modelling and Analysis of the Time Planners' Problem - Scheduling Patients for MRI Examinations 

      Eilertsen, Anders Rogne; Selvaag, Hanna Mørreaunet (Master thesis, 2017)
      The goal of this thesis is to identify possible areas of improvement in the scheduling process for MRI appointments at St. Olavs University Hospital. Our attention has been on the time planning, as this is considered to ...
    • Simulation of the response time distribution of fault-tolerant multi-tier cloud services 

      Gullhav, Anders Nordby; Nygreen, Bjørn; Heegaard, Poul Einar (Journal article; Peer reviewed, 2016)
      We are considering the problem of obtaining the response time distribution of fault-tolerant multi-tier services. In the provision of software-as-a-service applications, the service provider is obliged to ensure a certain ...
    • Stochastic investment model for offshore oil and gas production 

      Flasnes, Maren Omli (Master thesis, 2013)
      This report presents a stochastic multistage model that addresses strategic subsea separator investment decisions with reservoir uncertainty. Since strategic decisions in the petroleum industry have long-term consequences ...