1. Computer and Electronic Information, Guangxi University, Nanning 530004, P. R. China
2. Sichuan Changhong Elect Co Ltd, AI Res, Chengdu 610000, Sichuan, P. R. China
3. Guangxi Normal University for Nationalities, Chongzuo 532200, P. R. China
4. Zhuhai UM Science and Technology Research Institute, Zhuhai 519000, P. R. China, yytang@umac.mo