Research on Loading and Unloading Resource Scheduling and Optimization of Rail–Road Transportation in Container Terminal Based on “Internet +” —for Ghana Container Port Development Planning

Table 2

Decision variables table.

Symbol	Definition	Symbol	Definition
	0-1 variable, if loading operations are finished at the same place () on train with the unloading operations by the same gantry crane , then it is 1, otherwise, it is 0		0-1 variable, if loading operation and unloading operation of the same truck are finished by the same gantry crane , then it is 1, otherwise, it is 0
	0-1 variable, if container operation is finished by gantry crane , then it is 1, otherwise, it is 0		0-1 variable, if gantry crane moves to the start place of operation after finishing the operation, then it is 1, otherwise, it is 0