[1] School of Computer Science and Engineering, South China University of Technology, Guangzhou 510006, China
[2] Department of Mathematics, South China University of Technology, Guangzhou 510640, China
[3] Guangdong Power Grid Corporation Information Center, Guangzhou 510080, China
[4] Faculty of Computer, Guangdong University of Technology, Guangzhou 510006, China
[5] Natural Sciences Collegium, Eckerd College, FL, United States