Yong Xia is a professor in the Department of Civil and Environmental Engineering at the Hong Kong Polytechnic University. He has established health monitoring systems for a wide range of structures, including the the world-longest Hong Kong-Zhuhai-Macao Bridge. He is a council member of the International Society for Structural Health Monitoring of Intelligent Infrastructure and a fellow of The Hong Kong Institution of Engineers.Yi Zhou is an associate professor in the Department of Civil Engineering at the University of Science and Technology Beijing. He serves as a council member of the Institute of Diagnosis Treatment and Maintenance for Engineering at the Architectural Society of China and a research fellow at the National Observation and Research Station of Material Corrosion and Structural Safety of the Hong Kong-Zhuhai-Macao Bridge.