1. School of Electronical and Information Engineering, Anhui University of Technology, Maanshan, Anhui 243002, China
2. School of Computer Sciences and Technology, Anhui University of Technology, Maanshan, Anhui 243002, China
3. School of Computer Sciences and Information, Anqing Normal University, Anqing, Anhui 246133, China
4. Institute of Physical Science and Information Technology, Anhui University, Hefei, Anhui 230601, China