Prof. Sun-Ok Chung is a Professor of the Department of Biosystems Machinery Engineering at Chungnam National University, Republic of Korea. He obtained his BS and MS at the Department of Agricultural Machinery, Seoul National University, in 1995 and 1997, respectively, and a PhD in Biological Engineering from the University of Missouri, USA. His research areas are agricultural field machinery, engineering technologies for precision agriculture, and sensing and control of bio-production environment.