Affiliation: | 1. School of Computer and Information Engineering, Harbin University of Commerce, Harbin 150028, China 2. Dept.of Computer Science, Harbin Normal University, Harbin 150080, China 3. School of Computer Science and Technology, Harbin Institute of Technology, Harbin 150001, China 4. Faculty of Software of Fujian Normal University, Fuzhou 350007, China |