A Novel Resource-Leveling Approach for Construction Project Based on Differential Evolution

Table 1

Metrics for performance measurement.

Performance measurement	Notation	Calculation
Fitness function	𝑓	𝑓=∑^𝑇𝑘=1𝑦𝑘^2
Maximum resource demand	RDmax	RDmax=𝑦max
Cumulative variation of the resource demand between consecutive periods	CRV	CRV=∑^𝑇−1𝑘=1𝑦𝑘+1−𝑦𝑘
Maximum variation of the resource demand between two consecutive periods	RVmax	RVmax=max^𝑇−1𝑘=1𝑦𝑘+1−𝑦𝑘

Note: 𝑇 is the total project duration. 𝑦_𝑘 represents the resource requirements at day kth. 𝑦_max denotes the peak of the resource demand throughout the project execution.