Affiliation: | 1. Department of Information and Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450046, China;2. Key Laboratory for Wide Band Gap Semiconductor Materials and Devices of Education, School of Microelectronics, Xidian University, Xi'an 710071, China;3. Department of Mathematics and Information Science, North China University of Water Resources and Electric Power, Zhengzhou 450046, China |