Intelligent Nonlinear Friction Compensation Using Friction Observer and Backstepping Control. - Seong Ik Han; Chan Se Jeong; Sung Hee Park; Young Man Jeong; Chang Don Lee; Soon Yong Yang (ICIC (1), 2009)

Tool handling system using hydraulic actuator. - Kyung Taik Park; Doo Hyung Kim; Seock Joon Kim; Han Me Kim; Chang Don Lee (URAI, 2011)