1. Institute of Electronic Technique and Material Development Guangzhou Panyu Polytechnic Guangzhou 511483 P. R. China
2. School of Intelligent Manufacturing Guangzhou Panyu Polytechnic Guangzhou 511483 P. R. China
3. School of Information Engineering Guangzhou Panyu Polytechnic Guangzhou 511483 P. R. China
4. Songshan Lake Education Management Centre Bureau of Education of Dongguang City Dongguan 523429 P. R. China