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"Joong Bae Kim"

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"Joong Bae Kim"

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A Highway Secondary Accident Prevention System based on FFT Analysis of Vehicle Collision Sounds
Minki Jung, Young Shin Cho, Yongsik Ham, Joong Bae Kim
J. Korean Soc. Precis. Eng. 2025;42(9):749-756.
Published online September 1, 2025
DOI: https://doi.org/10.7736/JKSPE.025.037

This study introduces a highway secondary accident prevention system that employs Fast Fourier Transform (FFT) analysis of vehicle collision sounds. The system is designed to identify abnormal acoustic patterns produced during collisions and skidding events, enabling faster and more accurate accident detection than traditional methods. When a crash is detected, visual warning signals are instantly sent to nearby vehicles using LED devices powered by a photovoltaic panel and an energy storage system (ESS). Experimental results showed 100% detection accuracy during independent playback of collision, skidding, and driving sounds, and 80% accuracy during simultaneous playback. These results confirm the system's ability to effectively differentiate accident-related sounds and deliver timely alerts. This research offers an innovative and environmentally sustainable approach to enhancing highway safety and reducing the societal and economic consequences of secondary accidents.

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Thermal Design of Heatsink for M.2 NVMe SSD Reliability
Chan Ho Kim, Jinsung Rho, Joong Bae Kim
J. Korean Soc. Precis. Eng. 2023;40(5):389-397.
Published online May 1, 2023
DOI: https://doi.org/10.7736/JKSPE.023.001
M.2 NVMe SSD (Non-Volatile Memory express Solid-State Drive), which have higher computational speed and reliability than conventional devices, have come to be widely used. Recent studies have reported that M.2 NVMe SSD are beginning to have thermal issues due to the increasing heat generation occurring with the high chip density and high-performance operation in a limited space. Thermal issues in the controller and memory units of M.2 NVMe SSD lead to increased failure rates and decreased data retention times. In this study, we propose a compact and optimized thermal solution for commercial M.2 NVMe SSD installed between the mainboard and GPU (Graphic Processing Unit). A thermal and fluid dynamics simulation of an M.2 NVMe SSD, including the heatsink, was performed, and the Genetic Algorithm method was used to optimize the heatsink size.
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SEM Image Quality Improvement and MTF Measurement Technique for Image Quality Evaluation Using Convolutional Neural Network
Chan Ki Kim, Eung Chang Lee, Joong Bae Kim, Jinsung Rho
J. Korean Soc. Precis. Eng. 2023;40(4):275-282.
Published online April 1, 2023
DOI: https://doi.org/10.7736/JKSPE.023.003
As the size of semiconductor devices gradually decreases, it is important to measure and analyze semiconductor devices, to improve the image quality of semiconductors. We use VDSR, one of the Super-Resolution methods to improve the quality of semiconductor devices’ SEM images. VDSR is also a convolutional neural network that can be optimized with various parameters. In this study, a VDSR model for semiconductor devices’ SEM images was optimized using parameters such as depth of layers and amount of training data. Meanwhile, the quantitative evaluation and the qualitative evaluation did not match at the low scale factor. To solve this problem, we proposed an MTF measurement method using the slanted edge for better quantitative evaluation. This method was verified by comparing the results with the PSNR and SSIM index results, which are known as quality indicators. Based on the results, it was confirmed that using the MTF value could be a better approach for the evaluation of SEM images of the semiconductor device than using PSNR and SSIM.
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Dual-arm Robot for Cell Production of Cellular Phone
Hyun Min Do, Taeyong Choi, Chanhun Park, Dong Il Park, Jin Ho Kyung, Kye Kyung Kim, Sang Seung Kang, Joong Bae Kim, Jae Yeon Lee
J. Korean Soc. Precis. Eng. 2013;30(9):893-899.
Published online September 1, 2013
Recently, the requirement of automation in the cell production system is increasing due to a decrease of skilled workers who are the key point of a cell production system. This paper proposes a dual-arm robot designed and implemented with consideration of being applied to a cell production line of cellular phone. A specification was derived from the analysis of production process and the consideration of configuration for human-robot cooperation. Design and implementation results of the proposed dual-arm robot were suggested and the feasibility was verified through the demonstration of the proposed robot in some of packaging job of cellular phone.
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Object Recognition Method for Industrial Intelligent Robot
Kye Kyung Kim, Sang Seung Kang, Joong Bae Kim, Jae Yeon Lee, Hyun Min Do, Taeyong Choi, Jin Ho Kyung
J. Korean Soc. Precis. Eng. 2013;30(9):901-908.
Published online September 1, 2013
The introduction of industrial intelligent robot using vision sensor has been interested in automated factory. 2D and 3D vision sensors have used to recognize object and to estimate object pose, which is for packaging parts onto a complete whole. But it is not trivial task due to illumination and various types of objects. Object image has distorted due to illumination that has caused low reliability in recognition. In this paper, recognition method of complex shape object has been proposed. An accurate object region has detected from combined binary image, which has achieved using DoG filter and local adaptive binarization. The object has recognized using neural network, which is trained with sub-divided object class according to object type and rotation angle. Predefined shape model of object and maximal slope have used to estimate the pose of object. The performance has evaluated on ETRI database and recognition rate of 96% has obtained.
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