Qiang Qian received his BSc from Nanjing University of Aeronautics and Astronautics (NUAA), China. Currently he is a PhD student at the Department of Computer Science and Engineering, NUAA. His research interests include data mining and pattern recognition. E-mail: s.chen@nuaa.edu.cnSongcan Chen received his BSc in mathematics from Hangzhou University (now merged into Zhejiang University) in 1983. In December 1985, he completed the MSc in computer applications at Shanghai Jiaotong University and began working at Nanjing University of Aeronautics and Astronautics(NUAA) from January 1986 as an assistant lecturer. There he received a PhD degree in communication and information systems in 1997. Since 1998, as a full professor, he has been with the Department of Computer Science and Engineering at NUAA. His research interests include pattern recognition, machine learning, and neural computing. In these fields, he has authored or coauthored over 130 scientific journal papers.