Jin Xin Cao

Time-Dependent Discrete Transportation Network Design

The transportation network construction takes place over a quite long time span and need enough budget. The budget is from the allocation of funds in phases and the construction cost change in the process of the construction. The general static transportation network design problems ignores the problems above. So the optimal solution obtained by the static model is best in short time, and it is may be unfeasible in the actual situation. Based on the actual situation and the shortage of the static model, the time-dependent transport network design is proposed in this study. The plan horizon is divided into N intervals and a bi-level model is built to describe the problem. The objective of the upper-level is to minimize the total cost of the whole stages. the lower-level model is a user equilibrium model. Then the branch and bound (B-B) algorithm is designed to solve the model. It is obvious that the solution of the time-dependent simulation model is more feasible than the solution of the static sequential design.

Tandem Lift Quay Cranes and Yard Trucks Scheduling Problem at Container Terminals

The reasonable dispatching and scheduling of the Tandem Quay Cranes and trucks is the foundation to improve the efficiency of the container terminals. Under the base of single lift quay cranes research, a research on Tandem Lift Quay Cranes and Yard Trucks scheduling is carried on in this paper. A mixed integer programming (MIP) model can be built to solve an integrated tandem lift quay crane and yard truck scheduling problem (i-TLQCYT). A Local Sequence-cut Method is applied to solve the model. Then the shortest time to complete the unloading operations can be got.

An Integration Optimization for Berth Allocation and Quay Crane Scheduling Method Based on the Genetic and Ant Colony Algorithm

The berth and quay crane in port are scarce resources. The scheduling optimization of them affects the ships operating costs directly. In this paper we build an integration optimization model of berth allocation and quay crane scheduling to minimize the operating costs of quay crane and operating costs of the ships. A new genetic and ant colony algorithm is designed to solve this model.

Integration and Optimization of Quay Cranes and Trucks at Container Terminal

Along with the rapid growth of world trade, new requirement for throughput efficiency of modern container port are put forward. The existing optimization method to research the transport of the container terminal is single and complex. So in this article, the quantitative integrated optimization of the quay cranes and the trucks is made and the research scale is enlarge, in order to improve the efficiency of the research results. A model is built based on queuing network theory, and the mathematical algorithm is used to solve the model. Some experiments are used to demonstrate the feasibility and effectiveness of this study. The result shows that developed a genetic algorithm get the most optimal ratio of resource, and through a series of numerical examples . Are given The method to match the quay cranes and the trucks at container port logistics system, obtained by the techniques and algorithms in this study, can improvs the comprehensive efficiency of container ports.

The Integrated Berth and Quay Crane Scheduling Problem in Container Terminals

With the current development of the berth and quay crane in China, minimizing the total time of all ships stopping at the port, and maximizing the utilization rate of quay cranes to reduce the waiting time in the queue at the anchorage are the key to success in the field of container terminals. The objective of this paper is to minimize the total time of all stopped ships at the port and to maximize the operation efficiency of quay cranes. Compared with single berth and quay crane allocation, this paper analyzes the berth-quay crane as a whole, and an integer programming model with some constraints is built for this problem. Then the heuristic algorithm is used in this paper to optimize the problem and gain the solution. This paper provides a guide for practical operation.

Research on the Urban Traffic Flow and Traffic Problems in Hohhot

With a sustained growth of cars, many urban traffic problems caused by cars should be solved as soon as possible. However, basic urban traffic investigation and analysis of current situation is the the basis and the key to solve the problems. In this paper, investigation of traffic volume and pot speed is done at DongYing Road in Hohhot, and basic data base is established. Some significant parameters of urban traffic are calculated, and current traffic situation of the investigated road is detailedly analysed and studied. What is more, some problems found during the investigation are proposed and corresponding feasible suggestions are given.

Analysis of the Traffic Parameters Based on Traffic Investigation in the Hohhot

Urbanization sweeping the world has greatly increased the speed of urban life, and cars become the development trend of modern city. As a consequence, there is a growing number of contradictions within the systems of urban traffic. This article conducted traffic surveys in the West Second Ring road of Hohhot and analyzed the collected traffic data. Analysis to identify the existing problems of the Second Ring Road through the traffic parameters, given the optimization proposal based on the status, simulated the optimization method by VISSIM simulation software as while.

The Integrated Yard Truck and Yard Crane Scheduling and Storage Allocation Problem at Container Terminals

The storage block allocation, the yard truck and yard crane scheduling are three separate sub-problems in container terminals, playing an important role in the efficiency of port discharging operations. This paper proposes an integer programming model considering these three problems as a whole. The objective is to minimize the time when all the unloading operations have been completed and all containers have been stacked at storage block. A Local Sequence-Cut (LSC) method is developed to solve the problem.

Research on the Optimization Model of Berth Allocation-Quay Crane Assignment-Truck Scheduling at Container Terminals

The major difficulties of the operation of loading, unloading and transportation at container terminals are how to schedule berths, quay cranes and trucks more effectively and efficiently. Therefore, how to optimize their configurations effectively and connect them more reasonably is a problem which should be solved eagerly. However, a reasonable and effective optimization model is the basis and the key of this problem. The operation time of container terminals mainly depends on the time of ships in port and the operation time of trucks, quay cranes and yard cranes. So, the objective of this paper is to minimize the sum of these four parts. An optimization model based on some reasonable and necessary hypotheses is proposed and an algorithm and procedure are designed.

The Integrated Optimization of Container Port Logistics System Resources

The container port develops from the traditional loading and unloading transportation to the modern comprehensive logistics industry. Its function has made great extension, however the logistics system needs to be further integration optimization , this paper aims at the present stage of the unbalanced development of port container transportation , the service and coordinated ability is weak , the consciousness of cooperative competition is more poorer , the multimodal transportation is imperfection, the construction of information automation lag and so on, proposing measures to strengthen technological innovation , improve the consciousness of cooperative competition , and improve the level of container transportation services , etc. speeding up the integrated optimization of Container port logistics system resources and give full play to the container port overall advantage ,so as to promote competition ability .