1. College of Electronic and Information Engineering, Tongji University, Shanghai, China
2. Institute for Infocomm Research Agency for Science, Technology and Research, Fusionopolis Way, Singapore
3. Department of Electronic and Electrical Engineering, University College London, London, U.K.
4. School of Cyber Science and Technology, Beihang University, Beijing, China
5. Department of Electrical and Computer Engineering, Utah State University, Logan, UT, USA
6. International Research Institute of Disaster Science, Tohoku University, Sendai, Japan