A Multiscale Approach for Free-Float Bike-Sharing Electronic Fence Location Planning: A Case Study of Shenzhen City

Table 1

Notations of model formulation.

Sets	Definition
J	Electronic fence candidate collection,
K	Collection of user demand points for borrowing bikes,
I	Collection of user demand points for returning bikes,
Variables
	Equals 1 if the electronic fence is deployed in the location j, 0 if not
	Equals 1 if the demand for borrowing bike point k is served by electronic fence j, 0 if not
	Equals 1 if the demand for returning bike point k is served by electronic fence j, 0 if not
	The area for planning and deployment of electronic fence j. Unit:
Parameters
	The number of initial bikes at the electronic fence j
	User demand for borrowing bikes at k
	User demand for returning bikes at i
	Fixed cost of electronic fence, unit: yuan/place; the cost of land occupation for bikes. Unit: ; the distance cost incurred during the process of bike borrowing and returning by users,
	Percentage of area per electronic fence j in the study area
	The land area occupied by each individual bicycle,
	Number of candidate electronic fences
	Electronic fence capacity coefficient
	The distance generated by the user during the borrowing process; the distance generated by the user during the returning process; the maximum distance of borrowing and returning bikes