1. School of Computer Science and Technology, Heilongjiang University , Harbin 150080, China
2. Department of Computer Science, Shantou University , Shantou 515063, China
3. Department of Computer Science and Information Technology, La Trobe University , Melbourne, VIC 3083, Australia
4. School of Information Science and Engineering, Yanshan University , Qinhuangdao 066004, China
5. Center for Frontier Medical Engineering, Chiba University , Chiba 2638522, Japan
6. School of Mathematical Science, Heilongjiang University , Harbin 150080, China