Optimizing Construction Project Labor Utilization Using Differential Evolution: A Comparative Study of Mutation Strategies

Algorithm 2

Evaluating project labor utilization.

Begin Algorithm

Set ProjectDeadline, WorkingHoursPerShift // project information

Define PenaltyFactor // used when the constraint of project deadline is violated

Define ES, LS, EF, LF of each activity using Algorithm 1

Define Start Time of Activity: StartTime // ES() ≤ StartTime ≤ LS()

Calculate Finish Time of Activity: FinishTime = StartTime + Duration

Calculate Daily Labor Demand:

Calculate Moment of around time axis by (1)

Calculate DeadlinePenalty = PenaltyFactor ⋅ max(0, ProjectDuration − ProjectDeadline);

Calculate Fitness = + DeadlinePenalty

Return Fitness

End Algorithm