This paper approaches Genetic algorithm for multi objective optimization of the multi item multi period procurement lot sizing problem. A mathematical model is developed to simulate raw material procurement lot sizing analysis for a real time valve manufacturing company. Model takes into account the constraints imposed by the budget, maximum order quantity and limited warehouse space. The analy...

the scarcity of water resources and supply resources limitation, have caused an increasing gap between water supply and demand specially in recent decades in almost all regions of the globe. one of the best known solutions proposed by the economists is using the different water pricing approaches thereby obtaining the optimal allocation and social justice. to this purpose, this paper uses the p...

In this paper, we continue addressing the multi-region distribution problem of petroleum products in large quantities involving the use of a fleet of tankers parked in depots. This heterogeneous fleet consists of vehicles owned by the company or of renting, non-compartmentalized and without volumeters, to serve customers from removal sites. The objective is to minimize transportation cost while...

dam reservoirs supplies water resources for drinking, agriculture, and industry almost in all parts of iran. lack of proper utilization rules and unbalanced demands versus available water has led to many problems regarding to ineffective use of the water resources. precipitation and flow rate are stochastic phenomena. therefore, multi-step processes related to the water use efficiency should be...

In this paper, a comprehensive mathematical model for designing an electric power supply chain network via considering preventive maintenance under risk of network failures is proposed. The risk of capacity disruption of the distribution network is handled via using a two-stage stochastic programming as a framework for modeling the optimization problem. An applied method of planning for the net...

this paper proposes a new mathematical model for the integrated procurement-production-distribution problem of a fuzzy mixed integer linear programming (fmilp) type. considering the uncertainty in real problems, a number of parameters such as demand, capacity, and cost where their values are not available or known precisely, have been considered as trapezoidal fuzzy numbers. to solve fuzzy mixe...

One of the most complicated decision making problems for managers is the evaluation of bank performance, which involves various criteria. There are many studies about bank efficiency evaluation by network DEA in the literature review. These studies do not focus on multi-level network. Wu (Eur J Oper Res 207:856–864, 2010) proposed a bi-level structure for cost efficiency at the first time. In t...

due to the importance of supplier selection issue in supply chain management (scm) and ,also,  the increasing tendency of organizations to their social responsibilities, in this paper, we survey the supplier selection issue as a multi objective problem while considering the factor of corporate social responsibility (csr) as a mathematical parameter. the purpose of this paper is to design a mode...