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عنوان انگلیسی مقاله:
Optimizing temporary work and overtime in the Time Cost Quality Trade-offProblem
ترجمه فارسی عنوان مقاله:
بهینه سازی کار موقت و اضافه کاری در مسٔله تقابل کیفیت هزینه زمان
Sciencedirect - Elsevier - European Journal of Operational Research, 284 (2020) 743-761. doi:10.1016/j.ejor.2020.01.013
Jully Jeunet a , ∗, Mayassa Bou Orm b
In spite of its significant contribution to project success, quality has been scarcely addressed in the lit- erature on deterministic project scheduling problems. Although it is recognized that higher qualities are associated with longer processing times, no relationship between quality and resource consumption has been analytically derived to support this statement. As manufacturing projects can be accelerated us- ing additional manpower such as overtime and temporary workers, we derive an analytical relationship between quality and manpower since overtime and overmanning negate quality. We also take into ac- count productivity losses due to overmanning. Contrary to most previous contributions that focus on the project overall quality as an aggregation of quality levels attained at the individual activities, we impose each activity to reach a minimum quality threshold, which is consistent with project management prac- tices. Consequently, we develop a mixed integer linear programming (MILP) to optimize temporary work and overtime so as to accelerate a project with quality and productivity considerations. The objective is to simultaneously determine for each activity the number of permanent, temporary and overtime work- ers over the processing periods in order to minimize the makespan, the total cost and the overall quality losses subject to individual quality constraints, precedence relationships, nonpreemption and availability of resources. Our approach is successfully applied on numerous instances based on a real project of a high speed locomotive as well as on other projects taken from the literature.
Keywords: Project scheduling | Time Cost Quality Trade-offProblem | Activity quality | Temporary work | Overtime