Clean room robot with non-contact joints using magnetic bearings. - Toshiro Higuchi; Koichi Oka; Hiroshi Sugawara (Adv. Robotics, 1992)

A miniaturized levitation system with motion control using a piezoelectric actuator. - Takeshi Morita 002; Katsumi Shimizu; Masayuki Hasegawa; Koichi Oka; Toshiro Higuchi (IEEE Trans. Control. Syst. Technol., 2002)

Design, Modeling and Performance Testing of End-Effector for Sweet Pepper Harvesting Robot Hand. - Shivaji Bachche; Koichi Oka (J. Robotics Mechatronics, 2013)

Green pepper stem position detection by using a piezo sensor. - Peteris Eizentals; Koichi Oka (ASCC, 2015)

Fruit Pose Estimation and Stem Touch Detection for Green Pepper Automatic Harvesting. - Peteris Eizentals; Koichi Oka; Akinori Harada (ISER, 2016)

3D pose estimation of green pepper fruit for automated harvesting. - Peteris Eizentals; Koichi Oka (Comput. Electron. Agric., 2016)

Realization of Flexible Motion of Robot Joint with A Novel Permanent Magnetic Spring. - Ming Zhang; Lijin Fang; Feng Sun 007; Xingwei Sun; Yue Gao; Koichi Oka (ISR, 2018)

Bearingless motor with noncontact power supply* - FEM analysis of rotation performance -. - Koichi Oka; Isao Tanii; Kazuma Makita; James Lin; Akinori Harada (ASCC, 2019)

Design and Analysis of a Magnetic Levitation Tension Testing Device. - Mengyi Ren; Koichi Oka (IECON, 2021)

Fixed Stiffness-Damping Control of a Magnetic Levitation Bending Testing Device. - Mengyi Ren; Koichi Oka (AIM, 2022)

Control and simulation test of an unmanned aerial vehicle. - Kranthi Kumar Deveerasetty; Koichi Oka; Akinori Harada; Yimin Zhou 001 (ASCC, 2022)

Design and Analysis of a Non-Contact Tension Testing Device Based on Magnetic Levitation. - Mengyi Ren; Koichi Oka (IEEE Access, 2022)

Design of Zero-Power Control Strategy With Resisting Tilt of Hybrid Magnetic Levitation System. - Chuan Zhao; Koichi Oka; Feng Sun 007; Akinori Harada; Junjie Jin; Ming Zhang (IEEE Trans. Ind. Electron., 2022)

Design of a Noncontact Bending Testing Device Using Magnetic Levitation Mechanism. - Mengyi Ren; Koichi Oka (IEEE Trans. Ind. Electron., 2024)

Design and performance analysis of soft pneumatic manipulator-based linear cutter and stem holder for sweet pepper harvesting. - Zinat Tasneem; Koichi Oka (J. Field Robotics, 2024)