Powered upper-limb control using passivity-based nonlinear disturbance observer for unknown payload carrying applications. - Minjun Kim 003; Woongyong Lee; Jae Yeon Choi; Yong Sik Park; Sung Ho Park; Goo Bong Chung; Kyung-Lyong Han; Il Seop Choi; Il Hong Suh; Youngjin Choi; Wan Kyun Chung (ICRA, 2016)