中文摘要：

To whom correspondence should be addressed. E-mail： zhangxw@hhuc.edu.cn Received on May 10, 2010 Zhang Xuewu, born in 1973. He is a Ph.D. candidate in Hohai University now. He received the B.S. degree and the M.S. degree in computer and information engineering from Hohai University in 1998 and 2006, respectively. Currently, he is an associate professor of communication engineering at the School of Computer and Information Engineering, Hohai University. He has published over 20 research papers and obtained over 10 patents. His research interests include pattern recognition, multimedia signal processing, machine learning and bionics.