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Articles by Zhang Deyun
Total Records ( 2 ) for Zhang Deyun
  Gao Lei , Zhang Deyun , Wang Lei and Shi Hongfeng
  To the case k = 3 of the Berman`s approximation algorithm, the improved algorithm is proposed in this study. It constructs a Voronoi region to get the cost of triple subtree on the basis of using Fibonacci heap to count the shortest distance of each pair of points in the corresponding set. Then, to decrease useless triples by the topology analysis of Steinertree, it simplifies the topology and reduces the time complexity. In the experiment results, the filter factor β is above 0.9 for each example, some even up to 0.999. It shows that many useless triples have been filtered before the beginning of the evaluation phase and the construction phase.
  Zhao Dongping , Zhang Deyun and He Lin
  Network Address Translation (NAT) has become a powerful function of routers, which effectively conceals the size and topology of the private network from the outside. NAT works at the IP and TCP/UDP levels by translating the address and port numbers in the IP header and TCP/UDP header, respectively. But real-time applications such as voice over IP use IP addresses and port numbers inside their data payloads. In this paper, the author presents a new method, Application Level Gateways (ALGs), to allow an application on a host in one address realm to connect to its counterpart running on a host in different realm transparently. An ALG may interact with NAT to set up state, use NAT state information, modify application specific payload and perform whatever else is necessary to get the application running across disparate address realms. The concept of sub-flow classifier for H.323 packets is also proposed to shorten the call set-up time. The experiments demonstrate it very efficient and feasible.
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