Wu Qing was born in 1975. She received her M. E. degree in applied mathematics from Xidian University in 2005. Now she is studying for her Ph.D. degree in applied mathematics. Her main research interests include pattern recognition, machine learning and data mining. E-mail: qwu@mail.xidian.edu.cn Liu Sanyang was born in 1959. He is a professor and a doctoral supervisor in Department of Maghematieal Sciences in Xidian University. He is the author or coauthor of more than 300 scientific papers. His main research interests include optimization theory and computation, Learning theory, and data mining. Zhang Leyou was born in 1977. He received his M. E. degree in applied mathematics from Xidian University in 2002. Now he is studying for his Ph.D. degree in applied mathematics, His main research interests include machine learning and artificial intelligence,