Viser treff 119-138 av 158

    • A Simulation-Based Analysis for Effective Distribution of COVID-19 Vaccines: A Case Study in Norway 

      Sun, Xu; Andol, Eugenia Ama; Yu, Hao (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-08-24)
      Since December 2020, the vaccines from several manufacturers, e.g., Pfizer/BioNTech, Moderna, etc., have been approved for mass vaccination to control the COVID-19 pandemic, which has caused more than 100 million infections and 2.4 million deaths. These vaccines are produced and transported in large quantities to suffice the needs of several countries. Before arriving at the end-users, the vaccines ...
    • Smart Monitoring of Manufacturing Systems for Automated Decision-Making: A Multi-Method Framework 

      Pourhejazy, Pourya (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-10-15)
      Smart monitoring plays a principal role in the intelligent automation of manufacturing systems. Advanced data collection technologies, like sensors, have been widely used to facilitate real-time data collection. Computationally efficient analysis of the operating systems, however, remains relatively underdeveloped and requires more attention. Inspired by the capabilities of signal analysis and ...
    • SMEs challenges and needs in relation to innovation agendas and strategies 

      Ericson, Åsa; Holmqvist, Johan; Wenngren, Johan; Kaartinen, Heidi; Solvang, Wei Deng (Conference object; Konferansebidrag, 2016-06-21)
      Regional research project are, as is also regional industry, highly need-based. That is, understanding the stakeholders’ (or customers’) real challenges and related needs is important. This study is based on interviews with SMEs in the Northern parts of Finland, Norway and Sweden, but also on available innovation agendas and strategies for each country. The differences among the companies in those ...
    • Solving a Real-World Urban Postal Service Network Redesign Problem 

      Yu, Hao; Sun, Xu; Solvang, Wei Deng; Laporte, Gilbert (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-05-28)
      Due to recent technological advancements, more diversified customer demand, and increasingly harder competition, traditional postal service systems have experienced significant changes all over the world. In Norway, through a strategic reform called post-in-shop, undertaken in 2013, most postal services are now provided at postal service counters located in retailer stores in order to improve ...
    • Solving the Location Problem of Printers in a University Campus Using p-Median Location Model and AnyLogic Simulation 

      Sun, Xu; Yu, Hao; Solvang, Wei Deng (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-01-03)
      The location decision on service facilities is of significant importance in determining the accessibility of the service provided. Due to this reason, it has been extensively focused over the past decades by both researchers and practitioners. This paper investigates a novel two-phase hybrid method combining both optimization model and agent-based simulation in order to solve the location problem ...
    • State of the Art Review of Atmospheric Icing Sensors 

      Mughal, Umair Najeeb; Virk, Muhammad Shakeel; Mustafa, Mohamad (Journal article; Peer reviewed; Tidsskriftartikkel, 2016-03-31)
      A state of the art review of atmospheric icing sensors is presented in this article, in order to understand their design and working principle for future developments. It is found that most atmospheric icing sensors which are capable of delivering maximum information are based upon direct measurement of the physical properties (electrical or mechanical) of atmospheric ice. Some field measurements ...
    • Steady and Time Dependent Study of Laminar Separation Bubble (LSB) behavior along UAV Airfoil RG-15 

      Muhammed, Manaf; Virk, Muhammad Shakeel (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-03-29)
      The flow around the Unmanned Arial Vehicle (UAV) operating at a low Reynolds number regime of the O() is predominantly laminar and it leads to the formation of Laminar Separation Bubble (LSB). The pressure, shear stress, and heat flux distribution are considerably affected by LSB, which affects lift, drag, and pitching moment values. Most existing RANS (Reynolds-Averaged Navier-Stokes) turbulence ...
    • A Stochastic Closed-Loop Supply Chain Network Optimization Problem Considering Flexible Network Capacity 

      Yu, Hao; Solvang, Wei Deng; Sun, Xu (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-01-03)
      Nowadays, due to the concern of environmental challenges, global warming and climate change, companies across the globe have increasingly focused on the sustainable operations and management of their supply chains. Closed-loop supply chain (CLSC) is a new concept and practice, which combines both traditional forward supply chain and reverse logistics in order to simultaneously maximize the utilization ...
    • A Stochastic Network Design Problem for Hazardous Waste Management 

      Yu, Hao; Sun, Xu; Solvang, Wei Deng; Laporte, Gilbert; Lee, Carman K M (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-08-05)
      Hazardous waste management is of paramount importance due to the potential threats posed to the environment and local residents. The design of a hazardous waste management system involves several important decisions, i.e., the determination of the locations and sizes of treatment, recycling and disposal facilities, and organizing the transportation of hazardous waste among different facilities. In ...
    • A stochastic programming approach with improved multi-criteria scenario-based solution method for sustainable reverse logistics design of Waste electrical and electronic equipment (WEEE) 

      Yu, Hao; Solvang, Wei Deng (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-12-17)
      Today, the increased public concern for sustainable development and more stringent environmental regulations have become the most important driving forces for value recovery from end-of-life and end-of use products through reverse logistics. Waste electrical and electronic equipment (WEEE) contains both valuable components that need to be recycled and hazardous substances that have to be properly ...
    • Study of Airflow Behavior for Duplex Circular Cylinders 

      Sokolov, Pavlo; Virk, Muhammad Shakeel (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-09-16)
      The modeling of atmospheric ice accretion on duplex cylinders received a limited attention, with modeling carried by Wagner and Qing et al. The publicly available experimental data about the ice accretion on the duplex cylinders is limited to experiments of Qing et al. and Veerakumar et al. When comparing the data of Wagner and Qing et al. with the results of Veerakumar et al., the major ...
    • Study of Dry Ice Growth on Duplex Cylinders 

      Sokolov, Pavlo; Virk, Muhammad Shakeel (Journal article; Tidsskriftartikkel; Peer reviewed, 2022)
      A study of dry ice growth on bundled (duplex) cylinders has been performed using icing wind tunnel experiments and computational fluid dynamics (CFD) numerical simulations. The aim of this study is to "fill the gaps" in the works of Wagner (2010) and Qing et al. (2018). The numerical simulations cover a range of possible icing conditions by varying the operating wind speed, median volume diameter, ...
    • 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 ...
    • Study of Ice Accretion on Horizontal Axis Wind Turbine Blade using 2D and 3D Numerical Approach 

      Jin, Jia Yi; Virk, Muhammad Shakeel; Qin, hu; Jiang, Xingliang (Journal article; Tidsskriftartikkel; Peer reviewed, 2020)
      In order to optimize the wind turbine operation in ice prone cold regions, it is important to better understand the ice accretion process and how it affects the wind turbine performance. In this paper, Computational Fluid Dynamics (CFD) based 2D and 3D numerical techniques are used to simulate the airflow/droplet behaviour and resultant ice accretion on a 300 kW wind ...
    • Study of Ice Accretion on Horizontal Axis Wind Turbine Blade Using 2D and 3D Numerical Approach 

      Jin, Jia Yi; Virk, Muhammad Shakeel; Hu, Qin; Jiang, Xingliang (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-09-07)
      In order to optimize the wind turbine operation in ice prone cold regions, it is important to better understand the ice accretion process and how it affects the wind turbine performance. In this paper, Computational Fluid Dynamics (CFD) based 2D and 3D numerical techniques are used to simulate the airflow/droplet behaviour and resultant ice accretion on a 300 kW wind turbine blade. The aim is to ...
    • Study of ice accretion on wind turbine blade profiles using thermal infrared imaging 

      Yousuf, Adeel; Jin, Jia Yi; Sokolov, Pavlo; Virk, Muhammad Shakeel (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-07-08)
      Atmospheric icing has been recognized as hindrance in proper utilization of good wind resources in cold regions. There is a growing need to better understand the ice accretion physics along wind turbine blades to improve its performance and for optimal design of anti/de-icing system. This article describes a study of ice accretion along wind turbine blade profiles using thermal infrared imaging. Surface ...
    • Study of Wind Flow Angle and Velocity on Ice Accretion of Transmission Line Composite Insulators 

      Huang, Yafei; Virk, Muhammad Shakeel; Xingliang, Jiang (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-08-18)
      Ice accretion on insulators in cold regions is a serious and inevitable problem for power transmission lines, which may cause over-load and icing flashover accidents and can lead to wide power outage. In this research work, multiphase numerical simulations are carried out to investigate the effect of wind flow angle & velocity on the ice accretion of transmission line composite insulators. To verify ...
    • Study of Wind Flow Angle and Velocity on Ice Accretion of Transmission Line Composite Insulators 

      Huang, Yafei; Virk, Muhammad Shakeel; Jiang, Xingliang (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-08-18)
      Ice accretion on insulators in cold regions is a serious and inevitable problem for power transmission lines, which may cause over-load and icing flashover accidents and can lead to wide power outage. In this research work, multiphase numerical simulations are carried out to investigate the effect of wind flow angle & velocity on the ice accretion of transmission line composite insulators. To verify ...
    • Supply Chain Control Tower and the Adoption of Intelligent Dock Booking for Improving Efficiency 

      Wyciślak, Sławomir; Pourhejazy, Pourya (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-10-13)
      Poor coordination at distribution centers is a prime source of supply chain delays and energy waste that can be avoided through real-time planning and enhanced visibility. As a modern logistics topic with implications for supply chain transformation, Intelligent Dock Booking (IDB) coordinates the incoming and outgoing shipments at distribution centers. The research on IDB is at the early development ...
    • System Integration for Smart Reverse Logistics Management 

      Sun, Xu; Yu, Hao; Solvang, Wei Deng (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-02-16)
      To maximize the value and material recovery from waste products, smart reverse logistics aims at managing the complex flows of physical items, cash, data, and information. The effective management of these flows requires optimal decision making at strategic, tactical, and operational levels. To support the decision making, predictive, prescriptive, and descriptive analytics have been proved to be ...