Modeling of inventory routing problem considering collaborative strategy and change of minimum delivery unit constraint in emergency logistics

Abstract

This study focuses on the emergency logistics of building members for the purpose of early restoration of damaged building. Building members are assumed to be delivered out of the affected area in an unprocessed state and processed during the delivery plan. Therefore, it is necessary to consider the changes in minimum delivery unit constraints. This study formulated three delivery strategies, including a collaborative strategy, to minimize delays in delivery. Comparing each strategy using numerical experiments, it was shown that the use of a secondary storage facility with processing capability is most effective in reducing delays in delivery. In addition, it was shown that the use of planned transshipment, one of the collaborative strategies, can reduce delivery delays without using additional equipment.