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.
| Parameter | Descriptions |
| | 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 |
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