Model and Algorithm for Dependent Activity Schedule Optimization Combining with BIM

Table 1

List of the main symbols.

Variables	Meaning
	Upstream duration
	Downstream duration
	Characteristics of upstream activities
	The reliable of vendors
	Decision time
	Communication time
	The start time of overlapping & the first communication time
	Time interval between two adjacent communications
	The amount of communication intervals
	Maturity of upstream activity at t-time
	The maturity evolution coefficient of upstream activities before overlapping
	The maturity evolution coefficient of downstream activities after overlapping
	Downstream sensitivity
	Team error correction ability
	Learning coefficient
	The rework time caused by the change of upstream activities in the adjacent two communication intervals
	The total rework time
	The total duration
	The shorting duration
	The overlapping time
	Unit rework cost
	Unit overlapping cost
	Unit reward amount
	Unit communication cost
	The total revenue
TC	Communication frequency