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JKSPE : Journal of the Korean Society for Precision Engineering

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Design and Control of Master Device with Force Feedback for Teleoperated ERCP Guidewire Insertion
Woocheol Shin, SeongHyeon Won, YongJung Lee, Daehie Hong
J. Korean Soc. Precis. Eng. 2025;42(9):723-733.
Published online September 1, 2025
DOI: https://doi.org/10.7736/JKSPE.024.133

ERCP (Endoscopic Retrograde Cholangiopancreatography) is a common procedure used to diagnose and treat biliary and pancreatic diseases. However, the repeated exposure to X-ray radiation during these procedures poses health risks to surgeons. Teleoperation systems can help reduce this exposure, but they face challenges such as the lack of force feedback and differences between the master device's mechanisms and the movements of surgical tools, which can diminish surgical precision. This study aimed to develop a master device with force feedback specifically for teleoperated ERCP guidewire insertion, drawing inspiration from the natural hand movements of surgeons. The device includes a ring-shaped translation control handle and a rotation control handle, both designed to allow unlimited movement, thereby intuitively replicating the operation of the guidewire. A force feedback system was incorporated to enable collision detection and prevent potential injuries during procedures. Experimental results showed that the proposed system enhances control precision, reduces handling inertia, and provides effective force feedback. These advancements ensure safer and more accurate guidewire manipulation, addressing key limitations of existing teleoperation systems. Ultimately, this device not only minimizes radiation exposure for surgeons but also facilitates intuitive and precise teleoperated ERCP procedures.

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Controller for Unmanned Aerial Vehicle Using Parallel Mechanism
Woo Hyuk Jeon, Soobin Cho, Seongkyun Jeong, Jae Hwan Bong
J. Korean Soc. Precis. Eng. 2022;39(11):819-824.
Published online November 1, 2022
DOI: https://doi.org/10.7736/JKSPE.022.060
It is difficult for a human operator to find roll, pitch, yaw (RPY) that indicates the desired direction of unmanned aerial vehicle (UAV) in a three-dimensional space. Herein, a controller for UAV was developed allowing the human operator controlling the direction of UAV without finding RPY information. The algorithm implemented in the controller automatically calculated RPY information of UAV from the normal vector of the end effector. The developed controller was designed using a parallel mechanism. The joint angles of the controller were measured using potentiometers to estimate the normal vector of the end effector. Five subjects participated in an experiment to control a vector in three-dimensional space to follow a randomly generated target vector using the developed controller and the thumb sticks. The performance of the two controllers was evaluated by two methods: measuring the required time to reduce the error between the controlled vector and the target vector to be less than 0.1 cm and calculating a normalized error between the controlled vector and the target vector after manipulating the controlled vector for 10 seconds. When using the developed controller, the difference in control ability between subjects was reduced, and both required time and normalized error were generally reduced.
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Touch Screen Based Assistance Technique for Underwater Manipulation of Cable Burying ROV
Gun Rae Cho, Geonhui Ki, Ji-Hong Li
J. Korean Soc. Precis. Eng. 2019;36(4):349-361.
Published online April 1, 2019
DOI: https://doi.org/10.7736/KSPE.2019.36.4.349
URI-T can perform various underwater construction tasks such as cable burial and maintenance. Successful sea trial results show that URI-T could be used in underwater construction fields. To improve the efficiency of URI-T, an assisted teleoperation scheme for underwater manipulations was also proposed. For the proposed scheme, by touching several points on the touch screen, one can move the manipulator to the target; it can reduce the burden of teleoperation of every degree-of-freedom (DOF) of the manipulators. The scheme also has a position estimation technique that can estimate six DOF position of the objects using 2D positions on the two images from cameras deployed in stereo. Via touch screen, the 2D positions are fed to guarantee reliability of the estimated results, which is one of the most important points in the underwater interventions. A control structure for the assisted teleoperation was investigated using the position estimation technique. The structure involved an inverse kinematics scheme based on the weighted damped least squares, which can resolve the kinematical limitations: workspace limit and singularity, and joint limits on position and velocity. This study established that the proposed assistance technique could significantly reduce operation time in comparison with the conventional teleoperation.

Citations

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  • Study for Operation Method of Underwater Cable and Pipeline Burying ROV Trencher using Barge and Its Application in Real Construction
    Min-Gyu Kim, Hyungjoo Kang, Mun-Jik Lee, Gun Rae Cho, Ji-Hong Li, Tae-Sam Yoon, Jaeheung Ju, Han-Wan Kwak
    Journal of Ocean Engineering and Technology.2020; 34(5): 361.     CrossRef
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