He received his B.S. and M.S. degrees in automation from Shandong Industrial University (now merged into Shandong University), Jinan, China, in 1982 and 1987, respectively. Since 2000, he has been a Professor in Biomedical Engineering with the School of Control Science and Engineering, Shandong University where he was the Head of the research group of Noninvasive Evaluation of Cardiovascular Function. Prof. Liu was a recipient of the First Prize of the Science and Technology Award in technical invention awarded by the Ministry of Education, China, in 2003, and the Second Prize of the Science and Technology Award in invention awarded by Shandong Province, China, in 2016. He has authored over 100 articles, and he also holds more than 15 Chinese invention patents. His research interests include novel solutions for noninvasive detection of cardiovascular function, biomedical signal processing, biomedical measurements and devices, and physiological system modeling.