1. Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, P. R. China
2. Beijing Technology and Business University, Beijing 100048, P. R. China
3. College of Engineering, Dali University, Dali 671003, China
4. Faculty of Information Engineering and Automation, Kunming University of Science and Technology, Kunming 650093, P. R. China