Multimodal Transport Network Optimization Considering Safety Stock under Real-Time Information

Table 1

The description of each symbol.

Symbol	The description
	The selling price per unit of goods, represents the distribution department
	The regular order cost per unit of merchandise, , that is, the normal wholesale price of the production department
	The unit residual value of unsold goods,
	The unit penalty cost for unmet demand
	The unit combined transshipment price of goods from distribution department to distribution department ,
	The unit transfer cost of goods from distribution department j to distribution department i, assuming that the cost is borne by distribution department j,
	Regular order quantity of distribution department i
	The initial random market demand is predicted by distribution department i, and assume obeys normal distribution.
	The cumulative distribution function of
	The probability density function of
	The random market demand of distribution department i after the demand information is updated
	The cumulative distribution function of after the requirement information is updated
	The density function of after the requirement information is updated
	The cost of an emergency order per unit of merchandise, , that is, the emergency wholesale price of the production department
	After the demand information is updated, the order quantity of distribution department i,
	After the demand information is updated, distribution department i needs the quantity of urgent order,
	The expected profit of distribution department i on regular orders
	The expected profit of distribution department i after the demand information is updated and inventory adjustment is completed
	The ordering time provided by the production department,
	The lead time,
	The profit of production department
	Regular production cost of production department
	Emergency production cost of production department