Robust H∞ FIR sampled-data filter for uncertain time-varying systems with unknown nonlinearity. - M. E. Lee; H. S. Ryu; O. K. Kwon (ECC, 2001)

Design and Implementation of Artificial Intelligent Motorized Wheelchair System using Speech Recognition and Joystick. - L. H. Kim; S. I. Kang; H. S. Ryu; W. I. Jang; S. B. Lee; Abhijit S. Pandya (Control. Intell. Syst., 2005)