1. School of Information Science and Engineering, Fujian University of Technology, Fuzhou, Fujian 350108, China
2. Mountain Area Research Institute of Hebei Province, Agricultural University of Hebei, Baoding, Hebei 071000, China
3. Research Center for Microelectronics Technology in Fujian University of Technology, Fujian University of Technology, Fuzhou, Fujian 350108, China