Chen Weisheng was born in 1977. He received the B. S. degree from Qufu Normal University in 2000 and the M. S degree from Xidian University in 2004. Now he is a Ph. D candidate in the Department of Applied Mathematics at Xidian University. His research interests include adaptive control, neural network control and iterative learning control. E-mail: wsh_chen@tom.com Li Junmin was born in 1965. He received the B. S. and M. S. degrees from Xidian University in 1987, 1990, respectively. He received the Ph. D degree from Xi' an Jiaotong University in 1997. Currently, he is a professor of the Department of Applied Mathematics at Xidian University. His research interests include nonlinear and adaptive control, iterative learning control and hybrid systems.