Horizontal And Vertical Integration Of Maritime Supply Chain Transportation Resources Under Portfolio Contract

With the further promotion of economic globalization,shipping plays an increasingly important role in it,and thus the maritime supply chain has also been greatly developed.In recent years,the integration of resources has been the general trend,so the integration of resources in the maritime supply chain is also imperative,through the integration of resources in the maritime supply chain not only can improve the operational efficiency of the maritime supply chain,but also can improve the overall revenue of the maritime supply chain.While integrating the resources of the maritime supply chain,the maritime supply chain will be affected by various uncertain factors,such as the disruption of the maritime supply chain nodes caused by the epidemic and other unexpected events,and the unstable freight price caused by the fluctuation of demand.Therefore,this thesis studies the resource integration of maritime supply chain based on the consideration of node disruption and demand uncertainty.This thesis adopts a combination contract for horizontal and vertical resource integration of the maritime supply chain from the perspective of maximizing the overall revenue of the maritime supply chain,in which the horizontal resource integration adopts a quantity discount contract and the vertical adopts a revenue sharing contract,and then constructs the bi-level programming model in this thesis.The upper-level model ensures that the benefits of the maritime supply chain are maximized,employs opportunity constraints to describe the impact of demand uncertainty and node disruption on the decision-makers,and optimizes the horizontal and vertical integration strategy of multiple ports for upstream and downstream enterprises;the lower level model aims to minimize supplier transportation costs while maximizing the flow of containerized cargo,with the goal of minimizing total cost of suppliers.An improved algorithm combining genetic algorithm,Monte Carlo and least-fee maximum flow is used to solve the model of this thesis.The analysis of the cases concludes that under the influence of node disruption and demand uncertainty,the benefits of maritime supply chain integration are higher than those without integration.The negative impact of node disruptions on the maritime supply chain is significantly greater than that of demand uncertainty.The adoption of combination contracts for maritime supply chain resource integration can mitigate the negative impacts of node disruption and demand uncertainty to a certain extent.The adoption of revenue sharing contract for vertical resource integration of maritime supply chain can increase the competitiveness of participating nodes in the same tier to a certain extent,while the adoption of quantity discount contract for horizontal resource integration of maritime common supply chain can reduce the cost of participating nodes themselves to a certain extent,while further increasing the profit margin of nodes.The main contribution made in this thesis is that,compared with previous studies on maritime supply chain resource integration,this thesis adopts the form of combined contract to integrate maritime supply chain transportation resources horizontally and vertically,and analyzes the impact of maritime supply chain horizontal and vertical resource integration strategies on nodes under combined contract,considering node disruption and demand uncertainty.