1. School of Mechanical and Aerospace Engineering; Nanyang Technological University; Singapore 639798 Singapore
2. Micro-Nano Manufacturing and System Integration Center Chongqing Institute of Green and Intelligent Technology; Chinese Academy of Sciences; Chongqing 400714 PR China
3. Center for Environmental Sensing and Modeling (CENSAM); Singapore-MIT Alliance for Research and Technology (SMART) Centre; Singapore 117543 Singapore
4. Department of Architecture; Massachusetts Institute of Technology; Cambridge MA 02139 USA