1. School of Economics and Management, Taishan University,Taian,China
2. School of Information Science and Technology, Taishan University,Taian,China
3. College of Physics and Electronic Engineering, Taishan University,Taian,China
4. School of Information Science and Engineering, University of Jinan,Shandong Provincial Key Laboratory of Network-based Intelligent Computing,Jinan,China
5. School of Information Science and Engineering, University of Jinan,Jinan,China