Guest Edited by Zhiyong Fan (Hong Kong University of Science and Technology, Hong Kong SAR, China), Johnny C. Ho (City University of Hong Kong, Hong Kong SAR, China), Chuan Wang (Washington University in St. Louis, MO 63130, USA), Yun-Ze Long (Qingdao University, Qingdao 266071, China), and Huan Liu (Huazhong University of Science and Technology, Wuhan, 430074, China)