1. Information and Communication Engineering, Postdoctoral Research Station, Hefei University of Technology, Heifei 230009, China
2. AnHui Province Key Laboratory of Affective, Computing and Advanced Intelligent Machine, School of Computer and Information, Hefei University of Technology, Hefei 230009, China
3. Institute of Technology and Science, The University of Tokushima, Minami Josanjima, Tokushima 770-8506, Japan