Sharif Digital Repository

In this research, we propose a formulated approach to locate and allocate two level of a three-level closed-loop supply chain consist of a number of capable points production facilities, redistribution centers and customer clusters for multiple products in multiple time periods. Also, we consider environmental aspects in this supply chain network by taking into account an objective function, aside from cost objective function, in the template of emitted carbon dioxide. In this research for the first time we consider vehicles’ emitted CO2 different in each period which is a result of gradual depreciation of vehicles. In the end for the sake of validating model’s performance we developed few... 

Recently, reducing greenhouse gas emissions and the damage to the environment is very important. Due to the increasing environmental awareness of the people on the one hand, and government pressure to reduce damage to the environment on the other hand, has led organizations to pay more attention to this important issue. In addition, these organizations in order to participate in the global competition, should consider green criteria along with other criteria. Hence, the organizations to outsourcing part of their work are looking for Suppliers who along with other criteria also meet the criteria for being green. In this study, a new two-stage approach based on fuzzy... 

Today the environmental management with an emphasis on environmental protection has become one of the most important issues of our customers, governments, industry and competitors and the global and international pressures require the organizations to produce environmentally friendly products and services. This challenge led to the creation of a new concept known as green supply chain management in business areas which is a combination of environmental and supply chain thinking. The aim of this study was to evaluate the performance of green supply chain management using SCOR model and offered suggestions for its improvement and the hypothesis of the proper performance of supply chain... 

Location-routing problems are a class of well-known supply chain problems. the purpose of these problems are to locate depots, assign customers to the located depots, and to determine the routes in a way to minimize the costs of the supply chain.In the past two decades, with a rise in environmental problems including air pollution, green location-routing problems have been introduced and studied, problems in which environmental aspects such as air pollution have been considered.In this study, first, we model a two-stage stochastic green location routing problem; this problem includes a certain number of cities that each represent a customer. the locations of the cities are known and each... 

Blood is a very valuable material for the life of human beings and should be transfused to the patient as soon as possible in case of necessity. It is s perishable product and different blood products have different shelf lives. Therefore, it is important to manage properly blood product inventories in hospitals to avoid shortage and outdate as much as possible. In this research, a bi-objective mixed-integer programming model is developed which aims to simultaneously minimize the total cost of the supply chain network and the total environmental impacts of the activities of the supply chain network. Since the nature of the problem is uncertain, a robust possibilistic programming approach is... 

Due to the huge contribution of commercial transportation in creating pollutants, if various companies around the world are able to use electric vehicles, a big step will be taken in the direction of reducing pollution and expanding green supply chains. Despite the development of the infrastructure of electric vehicles and their use to transport goods and serve customers, this clean technology still faces many challenges.Among the weaknesses that researchers have been trying to deal with since the formation of electric vehicle routing is their low range of motion. After examining the way of using commercial electric vehicles, this research introduces the routing model of electric vehicles...