Recent additions

  • A Fuzzy-Stochastic Multi-Objective Model for Sustainable Planning of a Closed-Loop Supply Chain Considering Mixed Uncertainty and Network Flexibility 

    Yu, Hao; Solvang, Wei Deng (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-05-11)
    Closed-loop supply chain network design (CLSCND) has been increasingly spotlighted over the latest decade. The focus has been given to maximize the economic performance, resource utilization and sustainability through incorporating a holistic decision-making on both forward and reverse logistics. In this paper, a new fuzzy-stochastic multi-objective mathematical model is formulated for sustainable ...
  • A New Look at the Single Ladder Problem (SLP) via Integer Parametric Solutions to the Corresponding Quartic Equation 

    Høibakk, Ralph; Lukkassen, Dag; Meidell, Annette; Persson, Lars Erik (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-02-18)
    The aim is to put new light on the single ladder problem (SLP). Some new methods for finding complete integer solutions to the corresponding quartic equation z 4 −2L z 3 +( L 2 − a 2 − b 2 ) z 2 +2L a 2 z− L 2 a 2 =0 z4−2Lz3+(L2−a2−b2)z2+2La2z−L2a2=0 are developed. For the case L≥ L min L≥Lmin , these methods imply a complete parametric representation for integer ...
  • Wind energy at remote islands in arctic region—A case study of Solovetsky islands 

    Ghani, Rizwan; Kangash, Aleksei; Virk, Muhammad Shakeel; Maryandshev, Pavel; Mustafa, Mohamad (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-10-07)
    This paper describes a case study of wind resource assessment and wind park design at the Solovetsky Islands, which are located in the Arctic region of northern Russia. The Solovetsky historical and cultural complex has been included in the list of UNESCO's World Heritage Sites. 18 years of data of wind climatology from the NASA Langley Research Center are used for wind resource assessment at the ...
  • Reverse Logistics Network Design for Effective Management of Medical Waste in Epidemic Outbreaks: Insights from the Coronavirus Disease 2019 (COVID-19) Outbreak in Wuhan (China) 

    Yu, Hao; Sun, Xu; Solvang, Wei Deng; Zhao, Xu (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-03-09)
    The outbreak of an epidemic disease may pose significant treats to human beings and may further lead to a global crisis. In order to control the spread of an epidemic, the effective management of rapidly increased medical waste through establishing a temporary reverse logistics system is of vital importance. However, no research has been conducted with the focus on the design of an epidemic reverse ...
  • Experimental study of ice accretion on S826 & S832 wind turbine blade profiles 

    Jin, Jia Yi; Virk, Muhammad Shakeel (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-10-16)
    To optimize the aerodynamic performance and reduce production losses of wind turbine operating in icing conditions, it is necessary to better understand the ice accretion physics along wind turbine blade. This paper describes a case study of ice accretion physics and its effects on aerodynamic performance of S826 and S832 airfoils for dry and wet ice conditions. Both these airfoils have different ...
  • An investigation into empirical ice density formulations for dry ice growth on cylinders 

    Sokolov, Pavlo; Virk, Muhammad Shakeel (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-10-17)
    This paper describes an investigation into the empirical accreted icing density formulations, namely the numerical fits by (Makkonen and Stallabrass, 1984) and (Jones, 1990). Typically, the icing severity is estimated by the masses of the accreted ice, however, for this study the focus is primarily on the accreted ice densities and thicknesses for the main purpose of estimating the ice loads, in ...
  • Study of ice accretion and icing effects on aerodynamic characteristics of DU96 wind turbine blade profile 

    Jin, Jia Yi; Virk, Muhammad (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-01-26)
    In order to optimize the large wind turbines operation in ice prone cold regions, it is important to better understand the ice accretion physics and its effects on aerodynamic performance and power production losses. This paper describes a case study of ice accretion on DU96-W-180 airfoil, which has been used for large wind turbine blades such as NREL 5 MW. Analysis has been carried out for glaze ...
  • Architecture for Safe Human-Robot Collaboration: Multi-Modal Communication in Virtual Reality for Efficient Task Execution 

    Shu, Beibei; Sziebig, Gabor; Pieters, Roel (Peer reviewed; Chapter; Bokkapittel, 2019-08-01)
    Task-sharing and Human-Robot Collaboration has gained increased attention with the widespread commissioning and usage of collaborative robots. However, recent studies show that the fenceless collaborative robots are not as harmless as they look like. In order to study Human-Robot Interaction scenarios, in a safe manner, we propose to execute the scenario in Virtual Reality simulation and afterwards ...
  • Review of energy demands and wind resource assessment of the Solovetsky Archipelago 

    Ghani, Rizwan; Virk, Muhammad Shakeel; Kangash, Aleksei; Maryandshev, Pavel; lubov, viktar; Mustafa, Mohamad (Journal article; Tidsskriftartikkel, 2019-07)
    This paper aims to analyse the current situation of the energy system of the remote island territory of Solovetsky Archipelago. The Solovetsky historical and cultural complex was included in the list of UNESCO World Heritage Sites. Diesel fuel, which is used on the archipelago is expensive and pollutes the environment. By using Computational Fluid Dynamics (CFD) based numerical method, this study ...
  • Non-parametric Linear Technique for Measuring the Efficiency of Winter Road Maintenance in the Arctic Area 

    Hatamzad, Mahshid; Polanco Pinerez, Geanette (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-10-05)
    Improving the performance of Winter Road Maintenance (WRM) can increase the traffic safety and reduce the cost as well as environmental impacts. This study evaluates the efficiency of WRM technique, named salting, in the Arctic area by using Data Envelopment Analysis (DEA), which is a non-parametric linear method to measure the efficiencies of decision-making units (DMUs) based on handling multiple ...
  • Droplet distribution spectrum effects on dry ice growth on cylinders 

    Sokolov, Pavlo; Virk, Muhammad (Journal article; Peer reviewed, 2019-01-06)
    A detailed parametric analytical study along with a series of viscid multiphase numerical simulations of ice accretion were performed in comparison with experimental data of ice accretion on a 30 mm diameter cylinder. The study was performed for droplet distribution spectra, Langmuir (A-J), in addition to an experimental droplet distribution obtained in an icing tunnel.<br>Analysis shows that droplet ...
  • Digitalized manufacturing logistics in engineer-to-order operations 

    Strandhagen, Jo Wessel; Buer, Sven-Vegard; Semini, Marco; Alfnes, Erlend (Chapter; Bokkapittel, 2019)
    The high complexity in Engineer-To-Order (ETO) operations causes major challenges for manufacturing logistics, especially in complex ETO, i.e. one-of-a-kind production. Increased digitalization of manufacturing logistics processes and activities can facilitate more efficient coordination of the material and information flows for manufacturing operations in general. However, it is not clear how to ...
  • An Improved Mathematical Model for Green Lock Scheduling Problem of the Three Gorges Dam 

    Zhao, Xu; Lin, Qianjun; Yu, Hao (Journal article; Peer reviewed, 2019-05-08)
    In recent years, the environmental pollutions at the Three Gorges Dam have become an increasingly concerning issue of the Chinese government. One of the most significant environmental problems is the carbon emissions from the lockage operations at the two ship locks of the Three Gorges Dam. Currently, due to the large amount of vessels passing through the dam, there is always a long queue of vessels ...
  • A multi-objective mathematical programming for sustainable reverse logistics network design. Part II: Model application and analysis 

    Yu, Hao; Solvang, Wei Deng; Solvang, Bjørn (Peer reviewed; Chapter; Bokkapittel, 2016-02)
    Reverse logistics has received more and more attention during the past decade due to the increasing public awareness of sustainable development. Because of the fluctuation in both quantity and quality of the reverse material flow, design and planning of reverse logistics network is much more complicated compared with the forward ones. Therefore, it is important to develop decision support tools for ...
  • A value chain analysis for bioenergy production from biomass and biodegradable waste: a case study in Northern Norway 

    Yu, Hao; Roman, Elisabeth; Solvang, Wei Deng (Peer reviewed; Chapter, 2018-09-12)
    During the past decades, the concerns of the depletion of fossil fuels and global warming caused by excess GHG emissions have become the most important driving force for the development and utilization of renewable energy resources. The successful experiences from the EU-28 have proved that bioenergy production from biomass and biodegradable waste is the most reliable and promising solution in ...
  • Overview of modern teaching equipment that supports distant learning 

    Horvath, Csongor Mark; Thomessen, Trygve; Sziebig, Gabor (Journal article; Peer reviewed, 2018)
    Laboratory is a key element of engineering and applied sciences educational systems. With the development of Internet and connecting IT technologies, the appearance of remote laboratories was inevitable. Virtual laboratories are also available; they place the experiment in a simulated environment. However, this writing focuses on remote experiments not virtual ones. From the students’ point ...
  • Location-based analysis and optimization of service network performance: A case study 

    Yang, Shuo; Yu, Hao; Solvang, Wei Deng (Peer reviewed; Book; Chapter, 2018-05-07)
    The location problem of service network has been extensively focused by researchers in operational research due to the difficulty in balancing the level of service and efficiency. On the one hand, installing a large number of service facilities within the service network improves availability and responsiveness to customer demands, but it also increases the investment and operating cost. While on ...
  • Review of Icing Effects on Wind Turbine in Cold Regions 

    Virk, Muhammad; Afzal, Faizan (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-12-05)
    This paper describes a brief overview of main issues related to atmospheric ice accretion on wind turbines installed in cold climate region. Icing has significant effects on wind turbine performance particularly from aerodynamic and structural integrity perspective, as ice accumulates mainly on the leading edge of the blades that change its aerodynamic profile shape and effects its structural dynamics ...
  • A Comparison of Two Location Models in Optimizing the Decision-making on the Relocation Problem of Post Offices at Narvik, Norway 

    Yu, Hao; Solvang, Wei Deng (Peer reviewed; Book; Chapter, 2018)
    Since 2013, the postal service provider in Norway: Posten has implemented a new strategic plan to close their large post offices across the country for improving the cost and operational efficiency. Instead, with the cooperation with large retailers, the local postal service is provided at the Posten sub-branches at some supermarkets. In this paper, an optimization problem for relocating the post ...
  • Incorporating flexible capacity in the planning of a multi-product multi-echelon sustainable reverse logistics network under uncertainty 

    Yu, Hao; Solvang, Wei Deng (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-07-05)
    With the focus on sustainable development, the value recovery from End-of-Life (EOL) and End-of-Use (EOU) products has been given considerable attention by the whole society. Reverse logistics is the process for value recovery and re-creation through a series of activities, i.e., repair, remanufacturing, recycling and energy recovery. However, due to the stochastic reverse product flow, unstable ...

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