1. College of Information Engineering Shaoyang University Shaoyang China
2. Sichuan Province Key Laboratory of Information Materials and Devices Application College of Optoelectronic Engineering Chengdu University of Information Technology Chengdu China
3. State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of China Chengdu China
4. School of Civil Engineering and Geomatics Southwest Petroleum University Chengdu China
5. College of Electrical and Information Engineering Hunan University Changsha China