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Ja Choon Koo
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Journal Articles

A New Cam-Follower Safety Joint Mechanism Design Based on Variable-Length Four-Bar Linkage for Robot Safety

Seung Guk Baek, Hyungpil Moon, Hyouk Ryeol Choi, Ja Choon Koo
Journal: Journal of Mechanisms and Robotics
Article Type: Research Papers
J. Mechanisms Robotics. February 2022, 14(1): 011004.
Paper No: JMR-21-1115
DOI: https://doi.org/10.1115/1.4051518
Published Online: July 5, 2021
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Topics: Design, Linkages, Safety, Stiffness, Robots, Rotation
Proceedings Papers

Passive Air Leakage Detection Mechanism for a Vacuum Suction Actuator

Seung Ho Lee, Dong Jun Oh, Ja Choon Koo
Proc. ASME. ISPS2021, ASME 2021 30th Conference on Information Storage and Processing Systems, V001T09A003, June 2–3, 2021
Paper No: ISPS2021-65236
DOI: https://doi.org/10.1115/ISPS2021-65236
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Topics: Actuators, Leakage, Suction, Vacuum, Springs, Air flow, Brakes, Compressors, Inflow, Pressure
Proceedings Papers

Design of a Novel Variable Stiffness Series Elastic Actuator for Extended Linearity

Seung Ho Lee, Hyeok Jin Lee, Kyeong Ha Lee, Ji Min Baek, Ja Choon Koo
Proc. ASME. ISPS2019, ASME 2019 28th Conference on Information Storage and Processing Systems, V001T08A003, June 27–28, 2019
Paper No: ISPS2019-7499
DOI: https://doi.org/10.1115/ISPS2019-7499
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Topics: Actuators, Design, Stiffness, Torque, Displacement, Seas, Sensors, Robotics, Simulation
Proceedings Papers

Cost Effective On-Site Fault Diagnosis Home Appliance Using a Smart Phone and Support Vector Machine

Ji Min Baek, Kyeong Ha Lee, Seung Ho Lee, Ja Choon Koo
Proc. ASME. ISPS2019, ASME 2019 28th Conference on Information Storage and Processing Systems, V001T13A001, June 27–28, 2019
Paper No: ISPS2019-7445
DOI: https://doi.org/10.1115/ISPS2019-7445
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Topics: Fault diagnosis, Support vector machines, Machinery, Algorithms, Filters, Microphones, Washing machines, Acoustics, Electronics, Engineers
Journal Articles

Sliding Filament Joint Mechanism: Biomimetic Artificial Joint Mechanism for Artificial Skeletal Muscles

Kyeong Ho Cho, Ho Sang Jung, Sang Yul Yang, Youngeun Kim, Hugo Rodrigue, Hyungpil Moon, Ja Choon Koo, Hyouk Ryeol Choi
Journal: Journal of Mechanisms and Robotics
Article Type: Research-Article
J. Mechanisms Robotics. April 2019, 11(2): 021004.
Paper No: JMR-18-1265
DOI: https://doi.org/10.1115/1.4042349
Published Online: February 27, 2019
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Topics: Artificial joints, Biomimetics, Displacement, Gears, Muscle, Rotation, Wire, Actuators, Weight (Mass), Shrinkage (Materials)
Includes: Supplementary data
Proceedings Papers

Real-Time High Bandwidth Feedforward Position Control of Electro-Hydraulic Actuator Using Non-Minimum Phase Inverse Model

Kyeong Ha Lee, Seung Guk Baek, Ja Choon Koo
Proc. ASME. IDETC-CIE2017, Volume 9: 13th ASME/IEEE International Conference on Mechatronic and Embedded Systems and Applications, V009T07A053, August 6–9, 2017
Paper No: DETC2017-67628
DOI: https://doi.org/10.1115/DETC2017-67628
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Topics: Actuators, Feedforward control, Position control, Control equipment, Feedback, Transfer functions, Algorithms, Errors, Matlab, Signals
Proceedings Papers

A New Highly Sensitive Dielectric Slip Detection Sensor for a Robotic Operation

Sung Joon Kim, Ja Choon Koo
Proc. ASME. ISPS2017, ASME 2017 Conference on Information Storage and Processing Systems, V001T07A001, August 29–30, 2017
Paper No: ISPS2017-5403
DOI: https://doi.org/10.1115/ISPS2017-5403
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Topics: Robotics, Sensors, Skin, Tactile sensors, Electrodes, Grasping, Polymers, Algorithms, Aluminum, Delays
Proceedings Papers

Detection of Slippage Using Flexible Tactile Sensor for a Robot Fingertip

Sung Joon Kim, Jae Young Choi, Hyung Pil Moon, Hyouk Ryeol Choi, Ja Choon Koo
Proc. ASME. ISPS2016, ASME 2016 Conference on Information Storage and Processing Systems, V001T07A011, June 20–21, 2016
Paper No: ISPS2016-9567
DOI: https://doi.org/10.1115/ISPS2016-9567
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Topics: Robots, Tactile sensors, Sensors, End effectors, Nitrile rubber, Electrodes, Fatigue testing, Fingerprints, Graphene, Skin
Proceedings Papers

A Real Time Cost Effective Geometry Calibration Method for Isocenter Tracking of a Rotating Gantry Using Optical Vision Sensors

Zheng Yuan Li, Sungsoo Ryo, Hyuk Jin Lee, Ja Choon Koo
Proc. ASME. ISPS2016, ASME 2016 Conference on Information Storage and Processing Systems, V001T07A008, June 20–21, 2016
Paper No: ISPS2016-9559
DOI: https://doi.org/10.1115/ISPS2016-9559
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Topics: Calibration, Geometry, Sensors, Deformation, Lasers, Complementary metal oxide semiconductors, Finite element analysis, Imaging, Manufacturing, Optical instruments
Proceedings Papers

Development of a Novel Pneumatic Artificial Muscles Actuator Embedded Backbone and Position Sensor Using 3D-Printer

Hyuk Jin Lee, Baek Chul Kim, Ja Choon Koo
Proc. ASME. IDETC-CIE2015, Volume 9: 2015 ASME/IEEE International Conference on Mechatronic and Embedded Systems and Applications, V009T07A084, August 2–5, 2015
Paper No: DETC2015-47209
DOI: https://doi.org/10.1115/DETC2015-47209
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Topics: Actuators, Muscle, Sensors, Buckling, End effectors, Tendons
Proceedings Papers

Development of a Biomimetic Vibrotactile Sensor for Dynamic Deformation With an Array of Polymer Structures

Jae Young Choi, Baek Chul Kim, Ja Choon Koo
Proc. ASME. IDETC-CIE2015, Volume 9: 2015 ASME/IEEE International Conference on Mechatronic and Embedded Systems and Applications, V009T07A085, August 2–5, 2015
Paper No: DETC2015-47213
DOI: https://doi.org/10.1115/DETC2015-47213
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Topics: Biomimetics, Deformation, Polymers, Sensors, Skin, Vibration, Surface roughness, Density, Signals
Proceedings Papers

Optical Head Alignment Method Using Serial Manipulators for Maskless Lithography System

Jong Yoon Choi, Sae Whan Park, Yong Seok Inh, Zheng Yuan Li, Ja Choon Koo
Proc. ASME. ISPS2014, 2014 Conference on Information Storage and Processing Systems, V001T07A004, June 23–24, 2014
Paper No: ISPS2014-6927
DOI: https://doi.org/10.1115/ISPS2014-6927
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Topics: Manipulators, Maskless lithography, Algorithms, Errors, Kinematics, Design, Lithography, Reflectance, Cathode ray oscilloscopes, Electron beams
Proceedings Papers

Parallel Micro Manipulator for Effective Optical Spot Array Alignment

Zheng Yuan Li, Sae Whan Park, Yong Seok Inh, Jong Yoon Choi, Ja Choon Koo
Proc. ASME. ISPS2014, 2014 Conference on Information Storage and Processing Systems, V001T07A005, June 23–24, 2014
Paper No: ISPS2014-6929
DOI: https://doi.org/10.1115/ISPS2014-6929
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Topics: Genetic algorithms, Manipulators, Maskless lithography
Proceedings Papers

Position Alignment of Micro Manipulator Using Root Mean Square Errors for Maskless Lithography System

Yong Seok Ihn, Sae Whan Park, Ja Choon Koo
Proc. ASME. ISPS2013, ASME 2013 Conference on Information Storage and Processing Systems, V001T07A013, June 24–25, 2013
Paper No: ISPS2013-2943
DOI: https://doi.org/10.1115/ISPS2013-2943
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Topics: Errors, Manipulators, Maskless lithography, Mirrors, Photomasks, Lithography, Microelectromechanical systems, Manufacturing, Semiconductors (Materials)
Journal Articles

Finite Element Analysis for Shock Resistance Evaluation of Cushion-Packaged Multifunction Printer Considering Internal Modules

Se-Chang Kim, Dae-Geun Cho, Tae-Gyu Kim, Se-Hun Jung, Ja-Choon Koo, Moon-Ki Kim, Jae-Boong Choi
Journal: Journal of Electronic Packaging
Article Type: Research-Article
J. Electron. Packag. December 2013, 135(4): 041001.
Paper No: EP-13-1004
DOI: https://doi.org/10.1115/1.4024748
Published Online: August 7, 2013
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Topics: Finite element analysis, Finite element model, Shock (Mechanics), Impact testing, Packaging