Evaluation of multi-objective closed loop supply chain network integrated with blockchain for used lubrication oils obtained from vehicles in military forces by the linear programming

This thesis focuses on possible a solution about the Multi-objective Closed Loop Supply Chain Network which is integrated with Blockchain was designed for reduced costs and be provided visibility in the supply chain. Our first objective function is to reduce the cost by minimizing the amount of lubrication oil that purchase from the outside. Other objective function is to minimizing the environmental damage caused by used lubricating oil. We used the traceability and transparency features of Blockchain technology to reduce costs. We tried to reduce production and transfer costs by making these properties a parameter. The network is converted into the mathematical model and the mathematical model is solved with GAMS-CPLEX package program, the results of the long-term solution of the system solved by linear programming methods were evaluated.