1 Research Institute of Science for Safety and Sustainability, National Institute of Advanced Industrial Science and Technology, 16-1 Onogawa, Tsukuba, Ibaraki 305-8569, Japan.
2 Department of Mechanical Engineering, City University of Hong Kong, Kowloon Tong, Hong Kong. Electronic address: djlee@ntu.edu.tw.
3 Engineering Department - Palermo University, Viale delle Scienze, Ed. 8, 90128 Palermo, Italy.
4 School of Civil and Environmental Engineering, University of Technology Sydney, Sydney 2007, NWS, Australia.