1. Center for Environmental Sensing and Modeling (CENSAM) IRGSingapore-MIT Alliance for Research and Technology (SMART) Centre 1 CREATE Way 138602 Singapore
2. Department of Microsystem EngineeringNorthwestern Polytechnical University 127 West Youyi Road, Beilin District Xi'an Shaanxi 710072 China
3. School of Mechanical and Aerospace EngineeringNanyang Technological University 50 Nanyang Avenue 639798 Singapore
4. School of Electronics and Information TechnologySun Yat-sen University No. 135, Xingang Xi Road Guangzhou 510275 China
5. Department of Mechanical EngineeringMassachusetts Institute of Technology 77 Massachusetts Avenue Cambridge, MA 02139 USA