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 1

Variables definition table.

Symbol	Definition	Symbol	Definition
	Set of operations of loading or unloading containers, operation is different from operation .		Positive number that is large enough
	Number of gantry cranes on a loading and unloading line		Set of operations of loading or unloading for gantry crane .
	Total amount of loading and unloading operations		Total amount of loading and unloading operations for gantry crane
	Original X-coordinate of container		Final X-coordinate of container
	Original Y-coordinate of container		Final Y-coordinate of container
	Original Z-coordinate of container		Final Z-coordinate of container
,	Unloading operation and loading operation , which are carried out at the same place on the train	,	Unloading operation and loading operation q, which are carried out at the same trailer
	Length of container		Width of container
	Width of trucks operation passageway		Width of loading/unloading line
	The minimum height that the container bottom ascends when it was moved crosswise by lifting sling		Height of container
	Height of railway flatcar floor		Height of truck floor
	Safe distance between two gantry cranes		Distance that gantry crane trolley moves from to from operation to
	The distance travelled by gantry crane when it completes the operation		The distance travelled by gantry crane trolley when it completes the operation
	The distance travelled by lifting sling when it completes the operation		Speed of gantry crane
	Speed of lifting sling when it ascends or descends with container		Speed of gantry crane trolley
	The permitting time for operation of railway flatcars		Speed of lifting sling when it ascends or descends idly
	The moment when the loading or unloading operation of gantry crane is started		The moment when the loading or unloading operation of gantry crane is finished
	The moment when gantry crane starts operation		The moment when gantry crane completes operation
	The scheduled arrival moment of the truck for operation		The time cost of that gantry crane finishes operation of container , and then moves to the start place of operation of container