1. College of Computer Science and Technology, Qingdao University, Qingdao, China
2. School of Electronic and Information Engineering, Xian Jiaotong University, Xi’an, China
3. Department of Computer Science, Sam Houston State University, Huntsville, TX, USA
4. School of Cyber Science and Engineering, Shanghai Jiao Tong University, Shanghai, China
5. Technical Research and Development Department, JIC IOT Company Ltd., Nanchang, China