Research Article

Research on Hub-and-Spoke Transportation Network of China Railway Express

Table 1

The variables used for the p-hub median model in condition of fixed discount coefficient.

ParameterDescriptions

Discount factor between hubs
Traffic volume from node i to node j
Transportation cost for each traffic unit between nodes
0-1 variable, if the container flowing from node i to j passes through the hub k to m, then take 1; otherwise, take 0
0-1 variable, it takes 1 when node i is assigned to the hub k; otherwise, it takes 0
Total number of hub nodes