Yujuan Yin received her B.S. degree in 1987 from Department of Mathematics, Shandong University, M.E. degree in 1997, and Ph.D. degree in Control Theory and Applications in 2007, from Northeastern University, China. She is presently a professor in Liaoning University now. Her main research interests include switched systems, switched singular systems and impulsive control. E-mail:yinyj64@tom.com. Jan Zhao received his Ph.D. in Control Theory and Applications in 1991 at Northeastern University, China. From 1992 to 1993 he has a postdoctoral fellow at the same School of Information Science and Engineering, Northeastern University, China, where he is currently a professor. From February, 1998 to February 1999, he was a visiting scholar at the Coor-dinated Science Laboratory. University of Illi-nois Urbana-Champaign. He has held a Research Fellow position at Department of Electronic Engineering, City University of Hong Kong. His main research interests include switched systems, nonlinear systems, geometric control theory, and robust control. E-mail: zhaojun9305@126.com. Yuzhong LIU was born in 1963. He received his Ph.D. degree in Control Theory and Engineering at Northeastern University in 2001. He is currently a professor in the School of Mathematics and Systems Science, Shenyang Normal University. His main research interests include nonlinear control systems, hybrid systems and networked control systems. E-mail: liuyuzhong@sina.com.