中文摘要：

LIU Yan-Hong Received her master and Ph. D. degrees from the Department of Automation, Tsinghua University in 1992 and 2006, respectively. She is currently an associate professor with the School of Elec- trical Engineering, Zhengzhou University. Her research interest covers control of non- linear systems and nonlinear differential algebraic systems. Corresponding author of this paper. E-mail： liuyh@zzu.edu.cn LI Chun-Wen Received his bachelor, master, and Ph.D. degrees from the Department of Automation, Tsinghua University in 1982, 1985, and 1989, respectively. Since 1994, he has been a professor with the Department of Automation, Tsinghua University. His research interest covers nonlinear control system, non-standard analysis, complex system control, and quantum control system. E-mail： lcw@tsinghua.edu.cn WANG Yu-Zhen Received his Ph.D. degree from the Institute of Systems Science, Chinese Academy of Sciences in 2001. From 2001 to 2003, he was a post-doctoral fellow with Tsinghua University. Since 2003, he has been a professor with the School of Control Science and Engineering, Shandong University. From March 2004 to June 2004 and February 2006 to May 2006, he was a visiting research fellow with the City University of Hong Kong. FromSeptember 2004 to May 2005, he was a visiting research fellow with the National University of Singapore. His research interest covers nonlinear control systems, Hamiltonian systems, and robust control. E-maih wangyz@sdu.edu.cn