Dr. Kefu Liu currently is full professor in the Department of Mechanical Engineering, Lakehead University, Canada. He received the B.Eng. degree and the M.Sc. degree in Mechanical Engineering, Central South University, China, in 1981 and 1984, respectively, and the Ph.D. degree in Mechanical Engineering, Technical University of Nova Scotia, Canada, in 1992. He was assistant professor at St. Mary’s University from 1993 to 1995 and at Dalhousie University from 1995 to 1998, respectively. He joined Lakehead University as assistant professor in 1998 and was promoted to associate professor in 2001 and full professor in 2005. Dr. Liu is a member of the Canadian Society of Mechanical Engineering and a license holder of Professional Engineers Ontario. Dr. Liu’s research interests include vibration theory, vibration control, energy harvesting, machine condition monitoring and diagnosis, robotics, and mechatronics. He has published more than 80 journal papers and 40 conference papers.