Pan Shaoming

A dynamic statistical model for geospatial data access laws based on cloud computing

The strategy of storage and organization can be adjusted utilizing the access and distribution law of the spatial data, which will significantly improve system performance of spatial data services. The access and distribution law of the spatial data based on Hotmap and Zipf-like are statics, and can not reflect its global information real-time. A dynamic statistical method based on collaborative cloud is proposed in this paper to resolve above-mentioned problems. The nodes service capabilities are calculated in our algorithm. The node agents with good service capabilities are chosen preferentially in the group to fuse dynamic statistical information. The experimental results show that the performance of our algorithm can be improved by about 29% compared with the algorithm of random nodes. The algorithm can meet the need of dynamic statistics in large scale cloud mode with high efficiency.

Call Routing Algorithm for NGN Multimedia Communication Based on Quasi-homo-administrative Domain

Aimed at the lower access efficiency between administrative domains (AD) in NGN multimedia communication, we adopted the coding pattern for telephone number based on ITU-T E.164 protocol and the method in resolving process of DNS, and put forward a routing addressing algorithm for inter-domain communication. This algorithm was based on quasi-homo-administrative domain (QUAD). It used H.225 Annex G protocol messages to exchange address templates between superior level and lower level ADs. Therefore, they could get real-time address information. And all level ADs could keep a routing table of all ancestors. When it initiated a call, it applied for resolving an address to the furthest quasi-homo-level ancestor directly. So the resolving process could be done in a comparatively smaller domain. By analyzing the algorithm performance and simulating the algorithm model, we find it can reduce the response delay of routing greatly. It can also decrease the using and traffic of communication channels. In addition, it has the same coding pattern for telephone number like PSTN. So it can realize the intercommunication between PSTN network and Internet easily