This paper studies in detail the naming principle of published or subscribed parameters of simulation models in a distributed flight simulation system, analyzes and illustrates the composing characteristics and constructing algorithm of the published, subscribed or self-subscribed parameter area.

By analyzing the shortcomings of the traditional pattern of the university libraries in purchasing electronic resources which hinders the establishment of the resources-sharing platform,this article gives a deep expatiation on the advantages of the new platform for joint construction of electronic resources based on regional group purchase.

By analyzing shopping centers of America, Japan, Europe and southeastern Asia, this article states that some places of China have the right opportunity to develop large shopping centers, and large shopping center which has supper function out of its own regions have reached its limitation, but regional shopping centers will fully expand with the development of urbanization in China.