TY - JOUR ID - 3087 TI - Optimization of an energy based bi-objective multi skilled resource investment project scheduling problem JO - AUT Journal of Modeling and Simulation JA - MISCJ LA - en SN - 2588-2953 AU - Javanmard, Sh. AU - Afshar-Nadjafi, B. AU - Akhavan-Niaki, S.T. AD - Faculty of Industrial and Mechanical Engineering, Qazvin Branch, Islamic Azad University, Qazvin, Iran AD - Department of Industrial Engineering, Sharif University of Technology, Tehran, Iran Y1 - 2018 PY - 2018 VL - 50 IS - 2 SP - 129 EP - 140 KW - Multi-skilled project scheduling KW - resource investment problem KW - Energy usage KW - Ant colony optimization DO - 10.22060/miscj.2018.13848.5084 N2 - Growing concern in management of energy due to the increasing energy costs, has forced managers to optimize the amount of energy required to provide products and services. This research integrates an energy-based resource investment project-scheduling problem (RIP) under a multi-skilled structure of the resources. The proposed energy-based multi-skilled resource investment problem (EB-MSRIP) consists of a single project with a set of tasks that require several skills to be competed. Each skill could be applied in several levels of efficiency, each including significant energy and implementation costs. Similar to RIPs, in the EB-MSRIP the required levels of skills are considered as decision variables and a bi-objective formulation is proposed for the problem. The first objective of the model minimizes total cost with regards to energy consumption cost and implementation cost of required multi-skilled resources, and the second one minimizes the project’s makespan. The epsilon constraint method has been used to validate the developed formulation on several small-size instances. For larger problem instances, as epsilon constraint method fails to obtain a solution, the multi-objective ant colony optimization (MOACO) algorithm has been implemented to tackle the problems. The key control parameters of the proposed MOACO are tuned by Taguchi method. Computational results in terms of several measures, including MID, DM, NPS and SNS, determine notable advantages of proposed MOACO.  UR - https://miscj.aut.ac.ir/article_3087.html L1 - https://miscj.aut.ac.ir/article_3087_460b3ec0b7f9c9b2f9c9658c1cb8a3b1.pdf ER -