Yongjun Du received his B.S. degree in mathematics education from Shaanxi Normal University, Xi’an, China, in 2005; and his M.S. degree in applied mathematics in 2007 from Northwestern Polytechnical University, Xi’an, China, where he also received the Ph.D. degree in industrial engineering in 2020. He is currently a Lecturer in the Department of Management Science and Engineering with the School of Economics and Management, Lanzhou University of Technology, Lanzhou, China. He has authored or co-authored more than 10 academic papers and articles in journals and conferences in the past five years. He also headed and participated in four government-supported foundations. His research interests include reliability modeling, importance measures and maintenance management.