Study On Facility Location, Lot Sizing And Pricing Problem In Closed Loop Supply Chain

Nowadays, the competition and environment protection give more and more pressureon the companies. To handle with them, many companies begin the study on closed loopsupply chain to develop potential resources and meet the demand of environment protec-tion.This research firstly studies a capacitated facility location and lot sizing problem inclosed loop supply chain. This problem conclude two behaviors which are new products’selling and return products’ recycling. To enhance the relationship of forward logisticsand reverse logistics, the integration of joint locations and combined transportation areintroduced in this model. For this mathematical model, a Benders Decomposition Al-gorithm is developed to solve it. I add Valid Inequalities in the Banders Masterproblemto increase the validity of its optimal solution and disaggregate the Benders Subproblemto get more detail Benders cuts which can reduce the feasible region of Benders Mas-terproblem in a more accurate-exact way. After finish the whole algorithm, it is testedthrough some numerical experiments, which study the coordination of inventory reviewperiods and capacities’ impact on performance. Also it proves the acceleration efects ofthe two accelerated methods in the convergence of Benders decomposition and proves theefectiveness of the whole accelerated Benders decomposition Algorithm.This research secondly studies a capacitated facility location and pricing in forwardlogistics.This problem studies the pricing and selling behaviors of new products and re-manufacturing products. I develop a quadratic programming model and a mixed integerprogramming model for the line sharp or inverted-U shape relationship between demandand price. The two models are solved by Cplex12.4and I study the trends of pricing andtransaction strategies when the efect of demand cannibalization increases.By the study on these two problem, our research provide an efective algorithm forthe integrated problem in closed loop supply chain. Also, it provides valuable informa-tion for the companies’ price strategy when they start remanufacturing.