Research on Path Optimization of Vehicle-Drone Joint Distribution considering Customer Priority

Table 3

Variables.

Symbol	Definition
	Binary variable: 1, if a vehicle s is enabled; 0, otherwise
	Binary variable: 1, if a drone s is enabled; 0, otherwise
	Binary variable: 1, if customer i is delivered by vehicle s; 0, otherwise
	Binary variable: 1, if customer i goods are delivered by drones carried by vehicle s; 0, otherwise
	Binary variable: 1, if vehicle s from i to j; 0, otherwise
	Binary variable: 1, if vehicle s carrying drone from i to j; 0, otherwise
	Relationship between soft time window and satisfaction loss function