Competitive Supply chain coordination models of original equipment manufacturer-contract manufacturer based on contract optimization - دانشکده فنی و مهندسی
Competitive Supply chain coordination models of original equipment manufacturer-contract manufacturer based on contract optimization
نوع: Type: Thesis
مقطع: Segment: PHD
عنوان: Title: Competitive Supply chain coordination models of original equipment manufacturer-contract manufacturer based on contract optimization
ارائه دهنده: Provider: Ahmad Lotfi
اساتید راهنما: Supervisors: Dr. P. Samuei
اساتید مشاور: Advisory Professors:
اساتید ممتحن یا داور: Examining professors or referees: Dr. P.Fattahi,Dr. D. Rahmani
زمان و تاریخ ارائه: Time and date of presentation: 2025
مکان ارائه: Place of presentation: آمفی تئاتر
چکیده: Abstract: One of the research areas that has attracted the attention of researchers in the last few decades is the OEM-CM supply chain, whose relationships are defined by a contract. The overall goal of this thesis is to create coordination in the multi-OEM-multi-CM supply chain with multiple outsourcing based on contract optimization in the case of increased disruption (resulting from the bullwhip effect phenomenon) and competition. To better examine the dimensions of the research, the problem was examined in the form of four subproblems. In the first research subproblem, the largest lower bound index for the variance ratio of demand estimates from the perspective of contract manufacturers was calculated and a bi-objective nonlinear programming model was presented to reduce the bullwhip effect and determine the optimal parameters of the contract. The goal of the second subproblem is to create coordination based on a revenue sharing contract. Using the concept of a centralized supply chain, a new approach was obtained to obtain win-win conditions for the members. The results showed that there is a threshold outsourcing price beyond which manufacturers under the contract are motivated to overproduce and otherwise tend to produce according to the order quantity. The results showed that by optimizing the contract, the profit of members in the centralized mode is not less than that in the decentralized mode and a win-win situation can be created for the members. In the third sub-problem of the research, the goal is to create coordination in the supply chain using a hybrid contract (revenue sharing and option contract). To create coordination, two new methods based on the definition of the sub-supply chain and the linearization approach were used. The findings showed that the method based on the use of sub-chains is an efficient method for creating coordination and the game leader creates a win-win game by adjusting the parameters. The linearization-based approach also showed that among the different settings, options can be found that create win-win conditions for the parties. It was also proven that only for some values of the risk aversion threshold, the chain can be coordinated. In the fourth sub-problem of the research, coordination over a long period of time in the case of a hybrid revenue-sharing-option contract and without a hybrid contract was investigated. The dynamic behavior between producers based on changes in the contract participation percentage parameter was modeled using predator-prey equations and a new coordination strategy was presented. The results showed that for some values of the contract participation percentage parameter, the supply chain cannot be coordinated. Also, for some values of the contract participation percentage, more flexibility can be obtained in choosing the optimal solution for the win-win case.