چكيده به لاتين
Abstract:
Intermodal transportation is amongst the most complicated modes of transportation that have played a significant role in the growth of global business in recent decades. Instead of a single mode of transportation, it is a comprehensive and coordinated system incorporating different modes of transportation including marine, road, rail and air. Thus, designing a network capable of coordinating these modes in a socially, economically and environmentally sustainable way is of critical importance. The aim of this research is to design a sustainable intermodal transportation network under disruption. The mathematical model consists of three objective functions representing different aspects of sustainability in transportation. The first objective is to minimize total costs including maintenance and strengthening the arcs and nodes of the network. The second objective is to minimize delays caused by disruptions and the third objective is to minimize total emissions produced during the whole freight transportation process. In addition to arcs, failure in transportation nodes are also taken into account in this research. Therefore, the infrastructure agency has to decide on whether or not to strengthen arcs and nodes and the transportation company has to decide on the maintenance of vehicles. In order to solve the resultant multi-objective stochastic optimization problem, a hybrid epsilon constraint-scenario based robust optimization approach is applied. A real case study consisting a fraction of Iran’s freight transportation network from Shahid Rajaei and Boushehr ports to Tehran province has been analyzed using the proposed approach. To this end, the model has been implemented and solved in GAMS software. Analysis of the Pareto efficient solutions indicate that decreasing delays and environmental impacts leads to an increase in total costs. These results help the infrastructure agency and transportation companies to trade-off between delay/environmental impact reduction and cost minimization. Finally, a sensitivity analysis has been done to investigate the effect of changes in the budget of transportation company/infrastructure agency as well as the effects of the decision-maker’s risk aversion on total costs, total delays and environmental performance of the network.