HU Liang Received his master and Ph. D. degrees in computer science from Jilin University, in 1993 and 1999, respectively. Currently, he is a professor at the College of Computer Science and Technology, Jilin University. His research interest covers network security and distributed computing, including related theories, models, and algorithms of PKI/IBE, IDS/IPS, and grid computing. E-mail: hul@jlu.edu.cn CHE Xi-Long Received his bachelor and master degrees in computer science from Jilin University, in 2003 and 2006, respectively. Currently, he is a Ph.D. candidate at the College of Computer Science and Technology, Jilin University. His research interest covers computational intelligence and grid computing, including related theories, models and algorithms of ANN, SVC/SVR, evolutionary computa- tion and their applications in grid computing. Corresponding author of this paper. E-mail: paco01008@gmail.com