Development of Two-DOF Simultaneous Gravity Compensator for Mobile Manipulator. - Soo Yeon Choi; Hyunyong Lee; Ji Man Park; Hansol Kang; Seong Won Nam; Bum Su Yi; Yeong Woo Son; Jae Young Oh; Jun Ha Song; Bo Geun Kim; Dae Geun Song; Hyouk Ryeol Choi (IEEE Robotics Autom. Lett., 2025)