• A simulated annealing algorithm for routing problems with fuzzy constrains 

      Zarandi, Mohammad Hossein Fazel; Hemmati, Ahmad; Davari, Soheil; Turksen, I. Burhan (Journal article; Peer reviewed, 2014)
      This paper puts forward a location-routing problem with fuzzy demands (LRPFD). A fuzzy chance constrained programming (CCP) model is presented and a simulation-embedded simulated annealing (SA) algorithm is proposed to ...
    • An effective heuristic for solving a combined cargo and inventory routing problem in tramp shipping 

      Hemmati, Ahmad; Stålhane, Magnus; Hvattum, Lars Magnus; Andersson, Henrik (Journal article; Peer reviewed, 2015)
      In this paper a vendor managed inventory (VMI) service in tramp shipping is considered. VMI takes advantage of introducing flexibility in delivery time and cargo quantities by transferring inventory management and ordering ...
    • Benchmark Suite for Industrial and Tramp Ship Routing and Scheduling Problems 

      Hemmati, Ahmad; Hvattum, Lars Magnus; Fagerholt, Kjetil; Norstad, Inge (Journal article; Peer reviewed, 2014)
      This paper considers a class of cargo ship routing and scheduling problems from industrial and tramp shipping and presents a wide range of benchmark instances that have been created to represent realistic planning problems ...
    • Capacitated location-routing problem with time windows under uncertainty 

      Zarandi, Mohammad Hossein Fazel; Hemmati, Ahmad; Davari, Soheil; Turksen, I. Burhan (Journal article; Peer reviewed, 2012)
      This paper puts forward a location-routing problem with time windows (LRPTW) under uncertainty. It has been assumed that demands of customers and travel times are fuzzy variables. A fuzzy chance constrained programming ...
    • Optimization models and methods for maritime cargo and inventory routing problems 

      Hemmati, Ahmad (Doctoral thesis at NTNU;2015:198, Doctoral thesis, 2015)
      This thesis is part of the DOMinant II project. The DOMinant II project is a collaboration between three Norwegian research groups within the field of operations research. The goal of the project is to reduce the gap ...