Sun Bao-feng

Research reviews of socio-economic impact evaluation for VMS project on freeway

VMS project works as an essential component in ITS traffic information offering system. The paper reviews main international literatures of impact evaluation on VMS, points out issues existing in the past researches, analyzes socio-economic benefits produced by VMS and offers calculating models. Based on analysis in different evaluation methods, the paper applies benefit-cost analysis method, in an effort to show that socio-economic impact evaluation for VMS should begin with the control strategy of VMS, and subsequently technology evaluation, because above them are design and technology bases of VMS. Socio-economic impacts or benefits are reflected through its effects on traffic system and broad society and environment. The approach to identify VMSs socio-economic impacts in traffic network system is applicable to explore potential or indirect benefits of VMS, especially to evaluate integrative impacts among VMS and other components of traffic information offering system for ITS.

Remanufacturing System Cost Management Based on Integration of Target Costing and Activity-Based Costing

Cost management plays a very important part in the implementation of remanufacturing. This paper has firstly described the remanufacturing process which includes disassembling, sorting, inspecting, cleaning, refurbishing, re-inspecting etc. Then after the brief introduction of target costing (TC) method and activity-based costing (ABC) method, the integrated system of the two methods are established which will allow remanufacturing companies to account and control costs both at the strategic level and the operational level. Through an example of an automotive component remanufacturing company, the application and effectiveness of the integrated system are shown and a series of meaningful conclusions have been got, such as the rank of activity cost of each kind of product, the possible reasons of higher activity costs etc. Finally, some strategies are given for cost control. The integrated system put forward in this paper will be of great help and practical significance for cost management of remanufacturing companies.

Collinear Competition between Rail Transit and Bus Transit Based on Population Competition Model

The paper discusses the collinear competition problem between urban rail transit and conventional bus transit. It compares ecological population competition with collinear transit competition, and utilizes ecological theories and means to solve the collinear competition problem between transit modes. A collinear competition model between rail transit and bus transit based on Lotka-Volterra population competition model is set up to analyze the competition mechanism quantitatively and search for the equilibrium. The real data are applied for demonstration and some reliable conclusions are obtained.

Dynamic order strategy(R, s t , S T ) for automobile spare parts on a target service level

This paper studies on dynamic order strategy for auto spare parts on a target service level. A new three-dimensional classification is proposed integrated order policy of spare parts. It improves the present the weakness of ABC classification and combines with three control variables influenced the order policy, X demand, Y item price and Z variation of demand, to classify all spare parts. Unlike most extant inventory-control approaches, Strategy(R, st, ST) offered is a kind of dynamic order strategy integrated with inventory control parameters with inventory check cycle (R), dynamic reorder point (st) and dynamic order quantity (ST) and is set the goal with a target service level while minimizing of total inventory cost. It takes into accounts the dynamic requirements in category, time and quantity in accordance with automobile spare parts. Simulation experiments were performed by ARENA 10.0 to represent the performance of strategy (R, st, ST) and the optimized strategy is given. Outcomes simulating show that dynamic strategy (R, st, ST) enables to carry out dynamic inventory management and control by parameters R, st, ST for automobile spare parts. Also a goal under a certain target service level while satisfied the minimization of total inventory cost can be come true.

IDENTIFYING AND ELIMINATING CONSTRAINTS IN REVERSE LOGISTICS SYSTEM OF END-OF-LIFE HOME APPLIANCE

This research is conducted mainly to focus on constraints in the reverse logistics system of End-of-Life home appliance in China. With case study of Remanufacturing Plant, Resource Constraints in system are identified by logistics simulation, and then they are eliminated finally through using Drum-Buffer-Rope (DBR) scheduling of Theory of Constraints. Inventory Buffer is set just before the constraint unit as well as buffer size model is established. Outcomes suggests that DBR scheduling is exactly an effective approach to eliminate Resource Constraints and it enables to achieve the objective of optimizing parameters of throughput (T), investment (I) and operating expense (OE), even logistics balance.