Analysis and design of two types of digital repetitive control systems. - Woo Sok Chang; Il Hong Suh; Tae Won Kim (Autom., 1995)

Modeling of an Omni-Directional High Precision Friction Drive Positioning Stage. - Woo Sok Chang; Kamal Youcef-Toumi (ICRA, 1998)

An electromechanical valve drive incorporating a nonlinear mechanical transformer. - Woo Sok Chang (2003)

Development of 2-DOF robotic exoskeleton for upper limb rehabilitation after stroke. - Keunyoung Park; HongSoo Park; Sang Ho Yoon; Byung Ju Dan; Byeong-Rim Jo; Woo Sok Chang (RO-MAN, 2013)

Development of smart mobile walker for elderly and disabled. - Gyung-Hwan Yuk; HongSoo Park; Byung Ju Dan; Byeong-Rim Jo; Woo Sok Chang (RO-MAN, 2013)

Development of 2-DOF powered exoskeleton for upper limb rehabilitation. - Keunyoung Park; HongSoo Park; Sang Ho Yoon; Byung Ju Dan; Woo Sok Chang (URAI, 2013)

Smart walker development based on experts' feedback for elderly and disabled. - Gyung-Hwan Yuk; Yoon Young Chang; HongSoo Park; Byung Ju Dan; Woo Sok Chang (URAI, 2013)

Preliminary study for a soft wearable knee extensor to assist physically weak people. - Daegeun Park; HyunKi In; Haemin Lee; Sangyeop Lee; Inwook Koo; Brian Byunghyun Kang; Keunyoung Park; Woo Sok Chang; Kyu-Jin Cho (URAI, 2014)