王玉峰 To whom correpondence should be addressed. E-mail: B018068@bupt.edu.cn, wfwang@njupt.edu.cn; Wang Yufeng, born in 1974. He received his Ph. D degrees in State Key Laboratory of Networking and Switching Technologies, Beijing University of Posts and Telecommunications (BUFF) in 2004. Presently, He worked in Nanjing University of Posts and Telecommunications. His research interests include P2P and sensor networks.