Yang Jun was born in 1964. She received her M. S. degree from the applied mathematics, Harbin Institute of Technology in 1991, and her Ph.D. degree in mathematics from Harbin Institute of Technology in 2002. She is currently a professor of mathematics of Yanshan University. Her research interests include functional differential and difference equation, oscillation and stability analysis for time-delay system and its application. E-mail: jyang@ysu.edu.cn Li Shiyong was born in 1982. He received his B. S. degree in mathematics from Qingdao University in 2004, and his M. S. degree from Yanshan University in 2007. Now he is a Ph.D. student in Beijing Jiaotong University. His research interests include congestion control in network, nonlinear optimization and queueing theory. Long Chengnian was born in 1977. He received the Ph.D. degree from the Institute of Electrical Engineering, Yanshan University, in 2004. His current research ihterests include TCP congestion control for wireless network, and non-cooperative game in wireless ad Hoc networks. Guan Xinping was born in 1963. He received the Ph. D. degree in electrical engineering from Harbin Institute of Technology in 1999. Currently, he is a Professor of control theory and control engineering of Yanshan University. His research interests include energy- efficiency protocol design in wireless sensor networks, non-cooperative game in wireless ad hoc networks, internet congestion control in high speed networks and robust control and intelligent control of time-delay systems.