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"Yong Hoon Lee"

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Design and Performance Test of Fast Steering Mirror
Byoung Ju Lee, Yong Hoon Lee, Hyeong Rae Kim, Ye Eun Bae, Sang Uk Nam, Jae Woo Jung, Sang Won Jung, Young Jin Park, Jun Young Yoon, No Cheol Park, Seoung Han Lee
J. Korean Soc. Precis. Eng. 2025;42(11):927-936.
Published online November 1, 2025
DOI: https://doi.org/10.7736/JKSPE.025.070

Currently, advanced countries such as the US and the UK are researching laser-based weapons and communication systems. The application of Fast Steering Mirror (FSM) is crucial in laser systems to control internal optical paths and compensate for disturbances, including atmospheric fluctuations and mechanical vibrations. Additionally, research is underway to enhance image clarity in surveillance and reconnaissance systems, such as Electro-Optical/Infrared (EO/IR) systems, by applying FSM technology. Consequently, the demand for FSMs is rising, necessitating the development of small, lightweight, and high-performance solutions. In this study, we designed a compact and lightweight FSM with a diameter of 25 mm, and its performance was validated through rigorous testing. Furthermore, we developed a piezoelectric actuator using single crystal piezoelectric material to ensure a wide operating bandwidth and rapid response speed for the FSM. Before manufacturing the designed FSM, we conducted modeling and simulation (M&S) to analyze its performance and confirm that it met the required specifications. Subsequently, a prototype of the FSM was produced, and its operating range, bandwidth, and accuracy were evaluated through performance tests.

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Article
Open Controller Technology for the Process Monitoring of CFRP Machining
In Hugh Choi, Keyong Hoon Lee
J. Korean Soc. Precis. Eng. 2019;36(1):19-28.
Published online January 1, 2019
DOI: https://doi.org/10.7736/KSPE.2019.36.1.19
Since becoming highly functional, complex and flexible, the machining system of CFRP(Carbon Fiber Reinforced Plastic) has recently become highly functional, complex and flexible, its has its controllers are changing into open and distributed structures. These, and need controlling to be controlled to maintain good quality of for a quality of machined parts. In particularSpecifically, an open controller is required urgently needed to apply the optimal processing program for each material and development of embedded SW, which enables after-production of CFRP, CFRP-metal stack material, waterjet processing, inspection, and modification. As theThe characteristics of CFRP materials may create processing defects such as stratified material stripping and un-cut., a A process monitoring module that can minimize or prevent the defects this technology needs to should be applied to hence reducinge tool wear causedthrough by high hardness carbon fiber. Since CFRP is mostly made from additive forming, there are many drilling processes, that require precision measurement techniques and process signal monitoring technology, exist. Tsince the cutting force load and various signals generated during processing are weaker than those during metal processing. An open controller for process control and monitoring of a CFRP processing system was therefore developed. The system will then It is going to develop open controller SW structural design and open platform, multi-channel signal processing algorithm and sensor system, process specific functions (CFRP process control, boundary detection, etc.) and mount drilling tool parent monitoring algorithm on open platform.

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  • Comparative Analysis and Monitoring of Tool Wear in Carbon Fiber Reinforced Plastics Drilling
    Kyeong Bin Kim, Jang Hoon Seo, Tae-Gon Kim, Byung-Guk Jun, Young Hun Jeong
    Journal of the Korean Society for Precision Engineering.2020; 37(11): 813.     CrossRef
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