s.a.s rezazad - Department of Industrial Engineering and Management Systems, Amir Kabir University of Technology, Iran
m aminnayeri - Department of Industrial Engineering and Management Systems, Amir Kabir University of Technology, Iran
h karimi - Department of Industrial Engineering, K.N.Toosi University of Technology, Iran

In this paper an uncapacitated multiple allocation p-hub median problem is discussed. The model minimizes the transportation cost based on inventory service level at hubs through double paths betweenhubs. Inventory service level is defined as the percent of inventory shortage of vehicles at hubs accordingto passengers demand and replenishment time of vehicles. A real data from 25 nodes of municipality district 14 of Tehran is used to evaluate the performance of inventory service level in hub networks

Hub Location Allocation , Inventory Service Level , Congestion , Double Path Approach