Hongyang Liu, associate professor of Liupanshui Normal University, Liupanshui, China. He received aB.S. degree and an M.S. degree in Mining Engineering from China University of Mining and Technology, Xuzhou, China, in 2011 and 2014 respectively. He is currently working towards a Ph.D. in Mining Engineering with the School of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao, China. His research interests include mining pressure, strata control, and gas prevention and control.