Kai Liu received his B.S., M.S. and Ph.D. degrees at Xidian University, Xi’an, China in 1994, 1997 and 2001, respectively. From Mar. 2000 to Feb. 2001, he was a visiting researcher at Shizuoka University, Hamamatsu, Japan. From Jan. 2002 to Feb. 2004, he was a senior research associate at Illinois Institute of Technology, Chicago, USA. From Feb. 2015 to Mar. 2016, he was a visiting scholar at Texas A&M University, College Station, USA. He is currently a professor at the School of Electronics and Information Engineering, Beihang University, Beijing, China. His research interests include Information Communication Technology and Computing Intelligence.