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권남열,강두영,손훈 한국전산구조공학회 2016 한국전산구조공학회논문집 Vol.29 No.3
본 논문에서는 풍산 FNS에서 개발한 force-feedback형 고정밀 국산 3축 가속도계의 성능을 실험적으로 평가하고, 건설구조물 전산구조해석 및 유지관리용 건전성 모니터링에의 적용성을 논한다. 레이트 테이블 및 가진기를 통해 다양한 형태로 가진실험을 수행함으로써 국산 가속도계의 비선형성, 대역폭, 저주파 신호계측 성능, 바이어스 특성을 검증하고, 국내 가속도계 시장의 대부분을 차지하고 있는 해외 업체들의 대표적 가속도계와 성능을 비교 평가하여 국산 가속도계의 적용성과 시장진입 가능성을 평가하였다. 실험분석 결과 국산 가속도계는 실험으로 평가한 모든 항목에서 실험에 사용된 수입 가속도계보다 좋은 성능을 보였다. 특히 건설 구조물 계측에 필수적인 저주파 대역 계측성능은 수입 가속도계의 성능을 능가하였으며, 바이어스도 상수 특성을 가장 잘 유지하는 것으로 나타나 향후 실험기반 구조해석 및 구조물 장기 건전도 모니터링에 좋은 대안이 될 것으로 평가된다. A high-precision force-feedback 3-axes accelerometer developed in Korea has been investigated and studied for the verification of feasibility in the computational analysis and health monitoring of civil infrastructures. Through a series of experiment, the nonlinearity, bandwidth, low-frequency signal measurement accuracy and bias characteristics of the accelerometer has been thoroughly compared to those of two accelerometers produced by two market leaders in domestic and global accelerometer market. The experiment results shows that the overall measurement performance of the accelerometer has superiority over the performance of the two accelerometers from global market leader companies. Especially, the accelerometer shows a better low-frequency signal measurement accuracy and constant bias characteristic, which are mostly required in the computational analysis and the long-term health monitoring of large-scale civil infrastructures.
전계와 자계가 식물씨앗의 발아와 초기생장에 미치는 영향
문재덕,권남열 대한전기학회 2006 전기학회논문지C Vol.55 No.6(C)
- All the plants on earth live under an electric and magnetic field because the earth is a magnet and there is an electric field between the charged cloud and the ground. It has been reported that electromagnetic fields influence both the activation of ions and polarization of dipoles in living cells of seeds and plants, though the mechanism of these actions is still poorly understood. In this paper, the effects of the electric and magnetic fields and exposure times to the germination of several vegetable seeds and its early growth have been investigated experimentally to find out the feasibility of a plant factory for mass production of clean and unpolluted vegetables. The germination rate and the growth rate of some seeds under the fields exposed were analysed and compared with those of unexposed ones. It is found that the germination rate and its early growth rate of exposed seeds under the fields were accelerated about 1.1-1.4 and 1.7-2.2 times in maximum compared with those of unexposed ones. But, however, an inhibitory effect on germination and plant early growth were shown in the case of the higher electric and magnetic fields.
전계와 자계가 식물씨앗의 발아와 초기생장에 미치는 영향
文在德(Jae-Duk Moon),權男烈(Nam-Yul Kyon) 대한전기학회 2006 전기학회논문지C Vol.55 No.6
All the plants on earth live under an electric and magnetic field because the earth is a magnet and there is an electric field between the charged cloud and the ground. It has been reported that electromagnetic fields influence both the activation of ions and polarization of dipoles in living cells of seeds and plants, though the mechanism of these actions is still poorly understood. In this paper, the effects of the electric and magnetic fields and exposure times to the germination of several vegetable seeds and its early growth have been investigated experimentally to find out the feasibility of a plant factory for mass production of clean and unpolluted vegetables. The germination rate and the growth rate of some seeds under the fields exposed were analysed and compared with those of unexposed ones. It is found that the germination rate and its early growth rate of exposed seeds under the fields were accelerated about 1.1-1.4 and 1.7-2.2 times in maximum compared with those of unexposed ones. But, however, an inhibitory effect on germination and plant early growth were shown in the case of the higher electric and magnetic fields.
High-shock silicon accelerometer with suspended piezoresistive sensing bridges
배공명,이재민,권기범,한기호,권남열,한정삼,고종수 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.4
A high-shock 2000 g accelerometer with suspended piezoresistive sensing bridges has been designed, fabricated, and tested. Structuralsize of the accelerometer has been obtained through an optimal design process. Four resistors are electrically connected to form a Wheatstonebridge circuit. A sensitivity of 25.5 μV/g has been measured from the fabricated accelerometer with a nonlinearity of 0.2% in anacceleration range within 2000 g. The real-time response of the fabricated accelerometers accurately follows the reference accelerometer. The newly fabricated accelerometer has survived an over-shock condition of 4667 g.
High-Shock Silicon Accelerometer with a Plate Spring
이재민,장창욱,최창준,권기범,한정삼,권남열,고종수 한국정밀공학회 2016 International Journal of Precision Engineering and Vol.17 No.5
In this paper, a high-shock 2,000 g accelerometer with a plate spring has been designed, fabricated, and tested. The proposed accelerometer with a plate spring uses a device layer of an SOI (silicon on insulator) wafer. Moreover, the accelerometer has the merits of a simple fabrication process and the possibility of precisely controlling the thickness of the spring. In addition, the accelerometer has high structural stability because it is fabricated such that the plate spring surrounds the mass of the accelerometer. The detailed design dimensions of the proposed accelerometer were determined through an optimal design process. Furthermore, the proposed accelerometer was fabricated via MEMS processes. When a shock of 2,000 g was applied, the sensitivity of the fabricated accelerometer was 34.6 μV/g. When a shock within 2,000 g was applied, the non-linearity of the accelerometer was measured to be 1.4% or below. In addition, the transverse sensitivity of the fabricated accelerometer was 15% less than the measured sensitivity. The newly fabricated acceleration sensor showed stability to the extent that it was not destroyed even under a shock of 6,034 g, which was three times higher than the sensing range.
High-shock silicon accelerometer with an over-range stopper
이재민,장창욱,최창준,권기범,한정삼,권남열,고종수 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.4
In this research, an accelerometer with an over-range stopper was designed, fabricated and evaluated. When a shock beyond the sensing range is applied to an acceleration sensor, an over-range stopper limits the amount of longitudinal deformation in the sensing bridge, which is weak to shocks, below a certain level and so prevents the acceleration sensor from breaking. To analyze the effect of the overrange stopper shape on acceleration sensor performance, we fabricated high-shock accelerometers with over-range stoppers of three different lengths (short, medium and long models). We then performed a comparative analysis of the performance of each accelerometer.
오철수 교수 정년퇴임 기념호 : 펄스 고전압을 인가한 정전 산포 장치의 농약액 대전 특성과 과수 병충해 방제 특성
배창환 ( Chang Hwan Bae ),이운태 ( Woon Tae Lee ),권남열 ( Nam Yeol Kwon ),문재덕 ( Jae Duk Moon ),박승록 ( Seung Lok Park ),오철수 ( Chul Soo Oh ),강태경 ( Tae Gyung Kang ),이동현 ( Dong Hyeon Lee ),이동혁 ( Dong Hyeok Lee ) 경북대학교 전자기술연구소 2003 電子技術硏究誌 Vol.23 No.-