Research on the Optimization of Cross-Border Logistics Paths of the “Belt and Road” in the Inland Regions

Table 1

Model parameters.

Unit freight		The road transportation unit cost	Fixed costs		The fixed fees for services provided by the dry port
		The railway transportation unit cost			The fixed fee for the service provided by the airport
		The water transportation unit cost			The fixed fees for services provided by the seaport
		The air transportation unit cost	Freight volume		The freight volume from the source to the destination
Carbon emission		The unit carbon emission factor of road transportation			The freight volume discount factor
		The unit carbon emission factor of railway transportation
		The unit carbon emission factor of water transportation	Storage time		The storage time in the domestic seaport
		The unit carbon emission factor of air transportation unit carbon			The storage time in the dry port
		Carbon tax value			The storage time in the domestic airport
Transport distance		The road distance from domestic source to dry port			The storage time in the foreign dry port
		The road distance from domestic source to domestic seaport			The storage time in the foreign airport
		The road distance from the foreign seaport to the foreign destination			The storage time in the foreign seaport
		The road distance from the foreign dry port to the foreign destination	Transport speed		The air transportation speed
		The railway distance from the dry port to domestic the sea port			The railway transportation speed
		The air distance from the domestic airport to foreign the airport			The water transportation speed
		The railway distance from the dry port to the foreign dry port			The road transportation speed
		The water distance from the domestic seaport p to foreign the seaport