This paper gives the traffic simulation results of using message trunking,transmission trunking and quasi-transmission trunking in centered processing trunking radio system, the effects of three types of different trunking technology on traffic characteristics andthe traffic characteristics of centered processing trunking radio system.

Internal and External Increasing Returns, Dynamic Portfolio and Cluster Development: Empirical Study of the Automobile and Component Industry Cluster in Taizhou, Zhejiang, P. R. China;

The private enterprises cluster development is a very important phenomenon in Quanzhou s industrial structure ,and its strategy has been a essential content of Quanzhou s (economical) development .

Experiences got from cluster development in western advanced countries provide examples for the second undertaking of the medium and small sized .

Finally on the basis of the conclusion, we also put forward some suggestion about how to bulid up the R&D cluster for differe.