Li Caina was born in 1981. She is now pursuing the M. S. degree in the Research Center of Control Science and Engineering, Southern Yangtze University, China. Her current research interest includes robust passive control of linear system. E-mail: licaina 228@163.com Cui Baotong was born in 1960. He received the Ph. D. degree in control theory and control engineering from the College of Automation Science and Engineering, South China University of Technology, China, in 2003. He was a post-doctoral fellow at Shanghai Jiaotong University, China, from 2003 to 2005, He joined the Southern Yangtze University, China in 2003, where he is a full professor for College of Communication and Control Engineering. His current research interests include systems analysis, stability theory, artificial neural networks, impulsive control, and chaos synchronization. E-mail: btcui@vip.sohu.com