Browsing NTNU Open by Author "Agra, Agostinho"

Now showing items 1-9 of 9

    • A maritime inventory routing problem with stochastic sailing and port times 

      Agra, Agostinho; Christiansen, Marielle; Delgado, Alexandrino; Hvattum, Lars Magnus (Journal article; Peer reviewed, 2015)
      This paper describes a stochastic short sea shipping problem where a company is responsible for both the distribution of oil products between islands and the inventory management of those products at consumption storage ...

    • A Maritime Inventory Routing Problem: Discrete Time Formulations and Valid Inequalities 

      Agra, Agostinho; Andersson, Henrik; Christiansen, Marielle; Wolsey, L (Journal article; Peer reviewed, 2013)
      A single-product maritime inventory routing problem (MIRP) is studied in which the production and consumption rates vary over the planning horizon. The problem involves a heterogeneous fleet and multiple production and ...

    • Hybrid heuristics for a short sea inventory routing problem 

      Agra, Agostinho; Christiansen, Marielle; Delgado, Alexandrino; Simonetti, Luidi (Journal article; Peer reviewed, 2014)
      We consider a short sea fuel oil distribution problem where an oil company is responsible for the routing and scheduling of ships between ports such that the demand for various fuel oil products is satisfied during the ...

    • Improved models for a single vehicle continuous-time inventory routing problem with pickups and deliveries 

      Agra, Agostinho; Christiansen, Marielle; Wolsey, Laurence (Peer reviewed; Journal article, 2022)
      We consider an inventory routing problem in which a single vehicle is responsible for the transport of a commodity from a set of supply locations to a set of demand locations. At each location the inventory must be kept ...

    • Layered Formulation for the Robust Vehicle Routing Problem with Time Windows 

      Agra, Agostinho; Christiansen, Marielle; Figueiredo, Rosa; Hvattum, Lars Magnus; Poss, Michael; Requejo, Cristina (Journal article; Peer reviewed, 2012)
      This paper studies the vehicle routing problem with time windows where travel times are uncertain and belong to a predetermined polytope. The objective of the problem is to find a set of routes that services all nodes of ...

    • A MIP based local search heuristic for a stochastic maritime inventory routing problem 

      Agra, Agostinho; Christiansen, Marielle; Hvattum, Lars Magnus; Rodrigues, Filipe (Chapter, 2016)
      We consider a single product maritime inventory routing problem in which the production and consumption rates are constant over the planning horizon. The problem involves a heterogeneous fleet of ships and multiple production ...

    • Mixed integer formulatins for a short sea fuel oil distribution problem 

      Agra, Agostinho; Christiansen, Marielle; Delgado, Alexandrino (Journal article; Peer reviewed, 2013)
      We consider a short sea fuel oil distribution problem occurring in the archipelago at Cape Verde. Here, an oil company is responsible for the routing and scheduling of ships between the islands such that the demand for ...

    • Robust Optimization for a Maritime Inventory Routing Problem 

      Agra, Agostinho; Christiansen, Marielle; Hvattum, Lars Magnus; Rodrigues, Filipe (Journal article; Peer reviewed, 2018)
      We consider a single product maritime inventory routing problem in which the production and consumption rates are constant over the planning horizon. The problem involves a heterogeneous fleet and multiple production and ...

    • The robust vehicle routing problem with time windows 

      Agra, Agostinho; Christiansen, Marielle; Figueiredo, Rosa; Hvattum, Lars Magnus; Poss, Michael; Requejo, Cristina (Journal article; Peer reviewed, 2013)
      This paper addresses the robust vehicle routing problem with time windows. We are motivated by a problem that arises in maritime transportation where delays are frequent and should be taken into account. Our model only ...