1. School of Mechatronic Engineering, Guangdong Polytechnic Normal University, Guangzhou, China
2. School of Electronics and Information, Guangdong Polytechnic Normal University, Guangzhou, China
3. Zhonggang Steel Structure Engineering Company Ltd. of Hunan Hengyue, Hengyang, China
4. School of Computer Science, Guangdong Polytechnic Normal University, Guangzhou, China