A Genetic Algorithm with Lower Neighborhood Search for the Three-Dimensional Multiorder Open-Size Rectangular Packing Problem

Table 3

Description of the decision variables.

Variables	Description
	The length of the -th packing case
	The width of the -th packing case
	The height of the -th packing case
	Coordinates of the x-axis position of the -th item in the -th order loaded into the packing box
	Coordinates of the y-axis position of the -th item in the -th order loaded into the packing box
	Coordinates of the z-axis position of the -th item in the -th order loaded into the packing box
, , , , , , , ,	0-1 variables that determine the direction of rotation when the -th item in the th order is boxed
	0-1 variable for designing nonoverlapping constraints between item and item in the -th order