Xiaojie Xu received the B. Eng. degree from Huazhong University of Science and Technology, Wuhan, China, in 1982,and the M. Eng. Degree from Kobe University, Kobe, Japan, in 1996. Also, he completed the Doctor Course, Department of Control Engineering, Tokyo Institute of Technology, Tokyo, Japan, from 1996 to 2000.From 1982 to 1987, he was with Wuhan Shipping Industry College and Changjiang Institute of Shipping Science,Wuhan, China, respectively. From 1988 to 1992, he worked in Wuhan Patent Agency, Wuhan, China. Since 2001 he has been with Wuhan University. He is presently an Associate Professor at the School of Electrical Engineering, Wuhan University, Wuhan, China.