Sharif University of Technology Scientia Iranica 1026-3098 27 3 2020 06 01 Mathematical modelling of a decentralized multi-echelon supply chain network considering service level under uncertainty 1634 1654 21142 10.24200/sci.2018.50733.1842 EN R. Nourifar Department of Industrial Engineering, Mazandaran University of Science and Technology, Babol, P.O. Box 4716685635, Iran I. Mahdavi Department of Industrial Engineering, Mazandaran University of Science and Technology, Babol, P.O. Box 4716685635, Iran N. Mahdavi-Amiri Department of Mathematical Sciences, Sharif University of Technology, Tehran, Iran. M.M. Paydar Department of Industrial Engineering, Babol Noshirvani University of Technology, Babol, Iran. Journal Article 2018 04 06 We study a multi-time, multi-product and multi-echelon supply chain aggregate procurement, production and distribution planning problem and discuss the implications of formulating a tri-level model to integrate procurement, production and distribution, maintaining the existing hierarchy in the decision process. In our model, there are three different decision makers controlling the procurement, production and the distribution processes in the absence of cooperation because of different optimization strategies. First, we present a hierarchical tri-level programming model to deal with decentralized supply chain problems. Then, an algorithm is presented to solve the proposed model. A numerical illustration is provided to show the applicability of the optimization model and the proposed algorithm. In order to evaluate the application of the model and the proposed algorithm, ten sets of small and large problems are randomly generated and tested. The experimental results show that our proposed fuzzy-stochastic simulation based hierarchical interactive particle swarm optimization (Sim-HIPSO) performs well in finding good approximate solutions within reasonable computation times. https://scientiairanica.sharif.edu/article_21142_d2252b15ec092bfe5f703fef49aa127c.pdf