New actuator system using movable pulley for bio-mimetic system and wearable robot applications. - Hoyul Lee; Chulwoo Lee; Seongjin Kim; Youngjin Choi (ICRA, 2010)

Stackable 4-BAR mechanisms and their robotic applications. - Hoyul Lee; Youngjin Choi (IROS, 2010)

Stackable manipulator for mobile manipulation robot. - Hoyul Lee; Yonghwan Oh; Woong Hee Shon; Youngjin Choi (ICRA, 2012)