Research on the Distribution of Emergency Supplies during the COVID-19 Epidemic

Table 1

Parametric design description table.

Symbols	Meaning of symbols
	Distance traveled by the distribution vehicle from node to node
	Travel time of the distribution vehicle from node to node
	Speed of distribution vehicles
	The amount of distribution required for node
	Service time at demand point
	The left time window for demand point
	The right time window for demand point
	The left time window of the distribution center
C	The maximum load capacity of vehicles
M	A large enough positive number