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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
Publisher: ASME
Article Type: Research Papers
J. Mechanisms Robotics. February 2022, 14(1): 011004.
Paper No: JMR-21-1115
https://doi.org/10.1115/1.4051518
Published Online: July 5, 2021
View Article titled, A New Cam-Follower Safety Joint Mechanism Design Based on Variable-Length Four-Bar Linkage for Robot Safety
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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
Publisher: American Society of Mechanical Engineers
Paper No: ISPS2021-65236
https://doi.org/10.1115/ISPS2021-65236
View Paper titled, Passive Air Leakage Detection Mechanism for a Vacuum Suction Actuator
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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
Publisher: American Society of Mechanical Engineers
Paper No: ISPS2019-7499
https://doi.org/10.1115/ISPS2019-7499
View Paper titled, Design of a Novel Variable Stiffness Series Elastic Actuator for Extended Linearity
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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
Publisher: American Society of Mechanical Engineers
Paper No: ISPS2019-7445
https://doi.org/10.1115/ISPS2019-7445
View Paper titled, Cost Effective On-Site Fault Diagnosis Home Appliance Using a Smart Phone and Support Vector Machine
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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
Publisher: ASME
Article Type: Research-Article
J. Mechanisms Robotics. April 2019, 11(2): 021004.
Paper No: JMR-18-1265
https://doi.org/10.1115/1.4042349
Published Online: February 27, 2019
View Article titled, Sliding Filament Joint Mechanism: Biomimetic Artificial Joint Mechanism for Artificial Skeletal Muscles
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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
Publisher: American Society of Mechanical Engineers
Paper No: DETC2017-67628
https://doi.org/10.1115/DETC2017-67628
View Paper titled, Real-Time High Bandwidth Feedforward Position Control of Electro-Hydraulic Actuator Using Non-Minimum Phase Inverse Model
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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
Publisher: American Society of Mechanical Engineers
Paper No: ISPS2017-5403
https://doi.org/10.1115/ISPS2017-5403
View Paper titled, A New Highly Sensitive Dielectric Slip Detection Sensor for a Robotic Operation
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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
Publisher: American Society of Mechanical Engineers
Paper No: ISPS2016-9567
https://doi.org/10.1115/ISPS2016-9567
View Paper titled, Detection of Slippage Using Flexible Tactile Sensor for a Robot Fingertip
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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
Publisher: American Society of Mechanical Engineers
Paper No: ISPS2016-9559
https://doi.org/10.1115/ISPS2016-9559
View Paper titled, A Real Time Cost Effective Geometry Calibration Method for Isocenter Tracking of a Rotating Gantry Using Optical Vision Sensors
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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
Publisher: American Society of Mechanical Engineers
Paper No: DETC2015-47209
https://doi.org/10.1115/DETC2015-47209
View Paper titled, Development of a Novel Pneumatic Artificial Muscles Actuator Embedded Backbone and Position Sensor Using 3D-Printer
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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
Publisher: American Society of Mechanical Engineers
Paper No: DETC2015-47213
https://doi.org/10.1115/DETC2015-47213
View Paper titled, Development of a Biomimetic Vibrotactile Sensor for Dynamic Deformation With an Array of Polymer Structures
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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
Publisher: American Society of Mechanical Engineers
Paper No: ISPS2014-6927
https://doi.org/10.1115/ISPS2014-6927
View Paper titled, Optical Head Alignment Method Using Serial Manipulators for Maskless Lithography System
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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
Publisher: American Society of Mechanical Engineers
Paper No: ISPS2014-6929
https://doi.org/10.1115/ISPS2014-6929
View Paper titled, Parallel Micro Manipulator for Effective Optical Spot Array Alignment
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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
Publisher: American Society of Mechanical Engineers
Paper No: ISPS2013-2943
https://doi.org/10.1115/ISPS2013-2943
View Paper titled, Position Alignment of Micro Manipulator Using Root Mean Square Errors for Maskless Lithography System
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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
Publisher: ASME
Article Type: Research-Article
J. Electron. Packag. December 2013, 135(4): 041001.
Paper No: EP-13-1004
https://doi.org/10.1115/1.4024748
Published Online: August 7, 2013
View Article titled, Finite Element Analysis for Shock Resistance Evaluation of Cushion-Packaged Multifunction Printer Considering Internal Modules
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Topics: Finite element analysis, Finite element model, Shock (Mechanics), Impact testing, Packaging