A Research On The Functional Mechanism Of Developing Method And Design Pattern In Building Transportation Information System

Transportation networks have been well developed in China nowadays. How to fully excavate the potent of transportation, raise the efficiency and lower the cost must be carefully planned before construction. Information system building is the necessity of modern transportation and logistics. In light of this, the dissertation studies the development from a systematic view. A "top-down" qualitative-analysis and a "down-top" quantitative-analysis, Statistic and estimation analysis are combined used in the research to observe the action of different developing methods on different type of information system developing processes.(1) The qualitative analysis of functional mechanism of developing methodThe information system developing process is divided into four quadrants by pre and post information system developing, system logical and physical layer. Six functional domains are identified. Different characters of the methods are analyzed in the four quadrants and the six domains on a qualitative level. Different effects on information system developing under the direction of different methods are also discussed.(2) The statistic analysis of the functional mechanism of developing methodsDeveloping-method-sensitive factor set is summarized from the key process domains in CMM (Capacity Maturity Model) and the issues which most frequently discussed in information system overall evaluation fields. Data is collected from the information-system-developing-process documents of three systems which base on different developing method. Statistic analysis is made. It is concluded that the type of module, the logical complexity of module, the analysis and design ability of developer, time cost on module analysis, and the normalization of documents have important impact on the developing quality and efficiency. Furthermore, the influence of these factors to the efficiency of the whole developing process is found to be 1/3.(3) The overall evaluation and analysis of the functional mechanism of information system A comprehensive evaluation-indicator system of information system developing is established based on a systematic view. The DEA method is used to establish the input evaluation model and the super-efficiency model established base on the studies on the characters of several evaluation methods. Based on the relative efficiency analysis of three information system developed by three different methods, it is concluded that the DEA of three systems are all effective and the Object-Oriented method is found to be most effective. Furthermore, instructive conclusions are drawn by reducing evaluation indicators and after multiple-round evaluation to find the key factors in the information system developing process.(4) The empirical study on the function of design pattern on the optimization design of information systemRepresentative function models are selected from three systems. Optimized design plan based on design pattern is proposed respectively on the optimization of complex module design, the optimization of domain common component design, and the optimization of cross-domain common component design. Qualitative analyses are also given to the optimized design result.