1. College of Computer Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, China
2. Naveen Jindal School of Management, University of Texas at Dallas, Richardson, Texas
3. Jiangsu Key Laboratory of Big Data Security & Intelligent Processing, Nanjing University of Posts and Telecommunications, Nanjing, China
4. College of Electronic and Information Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, China