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Articles by Qing-hua Zheng
Total Records ( 2 ) for Qing-hua Zheng
  Qing-hua Zheng , S. Jiang , F. Zhang , T. Peng and C. Chen
  In this study, we propose a low-delay ALM protocol named TapMulti on Tapestry to achieve scalability and low-delay, . In TapMulti protocol, a delivery tree is designed to reduce end-to-end delay and improve stability of multicast system. This low-delay delivery tree is constructed on Tapestry and it can guarantee a tradeoff between delay and network-traffic load of multicast system by constraining width (maximal out-degree of node in the delivery tree) and depth of the delivery tree. Moreover, the efficient and proportional route mechanism of Tapestry is exploited to decrease the control cost to maintain multicast delivery tree. Simulated results indicate that, compared with other existing ALM approaches on Tapestry, TapMulti is of distinct advantages in aspects of end-to-end delay and control cost.
  Wan-Yu Deng , Kai Zhang , Qing-Hua Zheng and Wei Wei
  Compared with macro visualization like small-world structure in WWW, some fields such as knowledge visualization need such layout that can show detailed information of nodes and at the same time can reveal clustered structure of the Graph. Based on modular decomposition, energy model and adjustable center distance, one hierarchical layout algorithm was proposed. Through modular decomposition, the graph was firstly represented by a tree hierarchically. The local positions were then obtained from bottom to top and then the global positions are obtained from top to bottom. The experimental results on various datasets showed that the algorithm can achieve artistic and nearly non-overlapping appearance.
 
 
 
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