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몰드변압기에서 용량성 프로브에 의한 부분방전 검출 기술
정광석,박대원,차현규,차상욱,길경석,Jung, Kwang-Seok,Park, Dae-Won,Cha, Hyeon-Kyu,Cha, Sang-Wook,Kil, Gyung-Suk 한국전기전자재료학회 2011 전기전자재료학회논문지 Vol.24 No.4
This paper dealt with a partial discharge (PD) detection method for insulation diagnosis in cast-resin transformers. To detect PD pulse, a planar-capacitive probe was designed and fabricated. The probe has no insulation problem and can be installed on cast-resin transformers even in operation since it does not connect with high voltage conductor. The PD measurement system consists of the capacitive probe, a coupling network of 100 [kHz] low-cutoff frequency, and an amplifier with a gain of 40 [dB] and a frequency bandwidth of 500 [Hz]~45 [MHz]. A plane-needle and a plane-plane electrode system were fabricated to simulate insulation defects in a cast-resin transformer. Sensitivity of the PD measurement system, which is evaluated by a standard calibrator was 0.35 [mV/pC] for positive and 0.45 [mV/pC] for negative, respectively. The PD detection by the capacitive probe was less sensitive than that by a coupling capacitor according to IEC 60270, but we could analyze the magnitude and the phase distribution of PD pulse.
정광석,Jung, Kwangsuk 한국교통대학교 융복합기술연구소 2015 융ㆍ복합기술연구소 논문집 Vol.5 No.2
A novel topology for the magnet gear is proposed in this study. Differently from the existing methods, both sides of magnet array in this topology are used, resulting in increasing the efficiency of the mechanism. The closed magnetic path between the magnetic elements decreases the leakage flux, so the interlinking magnetic flux through the air-gap is focused and intensified. This paper discusses the dominant parameters of the proposed magnet gear influencing the resulting transmission torque. The parameters are designed from the sensitivity analysis using the commercial FEM analysis tool. And, the test setup for verifying the performance of the system is described.
정광석,원광민 제어로봇시스템학회 2011 제어로봇시스템학회 국내학술대회 논문집 Vol.2011 No.5
To prevent defects such as contamination and scratch caused by mechanical contact, conductive sheets which are produced through continuous web process can be levitated and transferred without friction with roller. In this paper, a few actuating principles for non-contact conveyance of conductive sheet are discussed along with real hardware implementation. Specially, the feasibility of each principle is analyzed at a control side.
동적 스트레칭이 제자리 멀리뛰기 동작의 운동역학적 수행력에 미치는 효과 분석
정광석,김성민,문제헌 한국체육교육학회 2023 한국체육교육학회지 Vol.28 No.2
목적: 본 연구의 목적은 학교체육 현장에서 수행할 수 있도록 고안한 동적 스트레칭이 제자리 멀리뛰기 동작의 운동역학적 수행력에 미치는 영향을 분석하는데 있다. 방법: 본 연구에서는 C 지역 소재 대학에 재학 중인 남자 대학생 24명(Age: 22.13±2.28 years, Height: 174.34±4.92 cm, Weight: 70.46±7.24 kg)을 대상으로 신체에 마커 부착 후 준비운동을 실시하고 지면반력 측정기위에서 제자리 멀리뛰기를 1분 간격으로 3회 실시하였다. 그리고 준비된 동적 스트레칭을 10분 간 수행한 후 동일한 방법으로 제자리 멀리뛰기를 3회 실시하였다. 측정변인은 제자리 멀리뛰기 동작을 통해 제자리 멀리뛰기의 기록, 신체중심의 최대 수평속도, 전후/좌우 방향의 지면반력, 전후면 방향의 엉덩, 무릎, 발목관절 최대각도, 각속도, 모멘트를 산출하였다. 모든 통계분석은 대응표본 차이검정을 적용하였고 통계적 유의수준은 α=.05로 설정하였다. 결과: 제자리 멀리뛰기 기록은 동적 스트레칭 전 보다 동적 스트레칭 후 약 7 cm 증가하였고, 신체중심 수평속도는빠르게 나타났다(p<.05). 무릎관절의 최대 폄 각속도와 발목관절의 최대 발바닥굽힘 각속도는 좌우측 다리 모두 동적스트레칭 실시 전 보다 빠르게 나타났다(p<.05). 최대 전후 및 수직 지면반력은 좌우측 다리 모두 증가하였다(p<.05). 결론: 동적 스트레칭을 통해 제자리 멀리뛰기 기록, 신체중심 수평 속도, 무릎 및 발목관절 각속도, 최대 전후/수직 지면반력을 증가시킬 수 있었다.
Machine Learning Application to the Korean Freshwater Ecosystems
정광석,김동균,전태수,주기재 한국생태학회 2005 Journal of Ecology and Environment Vol.28 No.6
ecosystem research. Currently, many studies have been carried out to find the patterns of environmental impact on dynamics of communities in aquatic ecosystems. Ecological models popularly adapted by many researchers have been a means of information processing in dealing with dynamics in various ecosystems. The up-to-date trend in ecological modelling partially turns to the application of ML to explain specific ecological events in complex ecosystems and to overcome the necessity of complicated data manipulation. This paper briefly introduces ML techniques applied to freshwater ecosystems in Korea. The manuscript provides promising information for the ecologists who utilize ML for elucidating complex ecological patterns and undertaking modelling of spatial and temporal dynamics of communities.
전자기력 조합에 기초한 평면 구동기를 이용한 자기 부상 방식 초정밀 스테이지
정광석,백윤수,Jeong, Gwang-Seok,Baek, Yun-Su 대한기계학회 2001 大韓機械學會論文集A Vol.25 No.11
In this Paper, we suggest the precision stage using a novel non-contact planar actuator that utilizes an interaction between an array type of air-core solenoids and permanent magnets. The former with axes arranged in the mutually orthogonal direction is fixed on the stator and the latter with the same polar direction is attached below the stage. The promising magnetic structure has little uncertainty such as hysteresis loss caused by ferromagnetic material, then it is simple to quantify the magnetic phenomenon. And all the magnetic forces are transmitted through narrow air-gap between the coil and the permanent magnet, therefore the structure can be highly compacted. Furthermore, the stage or plate can be perfectly isolated from the stator without any wire connection, leading to diminish the generating possibility of wear particles due to mechanical contact. Then. it is estimated that the proposed operating principle is very suitable for work requiring high accuracy and cleanness. or general-purpose nano stage. The main issues rebated to the plate driving are discussed here.