• 대한전기학회:학술대회논문집
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• 대한전기학회 2000년도 하계학술대회 논문집 A
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• pp.550-551
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• 2000

This paper suggests the system which monitors and diagnoses the distribution transformers. Moreover, this paper has established the system for the multi diagnoses by all the informations. Through the proven oil sensor, the oil temperature, capacitance and $tan{\delta}$ could be measured throughly, and followed by these informations, detected problems of the distribution transformers, using wireless data communication, could directly reported to the main host. For this, the proposed system is divided into sensor part and controller part. To prove the usefulness of the system, the paper compared and analyzed the system with the existing one, and after studying the correlation of the both, the result proved its goodness.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 1998년도 추계학술대회 논문집
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• pp.198-203
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• 1998

To acquire the high precision of profile for standard electrode of loss angle, it is needed ultraprecision machining technology like MEAP(Magnetic Electronic Abrasive Polishing) and the very high profile measurement technology which can measure a micro unit about the workpiece. So, in this paper, it was developed the measurement system of precision of profile using non-contactable sensor that was approximate sensor of capacitance type, because that is better than others in the electrical characteristics. And standard electrode of loss angle was machined by the MEAP machining technology. In this study, it was development of precision measurement system. This system could be used measure the workpiece of roundness and straightness much more precise and faster than general mechanical measurement system done before. And it could be helped to minimize machining time and planning by very fast and precise measurement about the workpiece.

• 제어로봇시스템학회논문지
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• 제20권4호
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• pp.463-467
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• 2014

High precision machining technology has become one of the most important parts in the development of a precision machine. Such a machine requires high precision positioning as well as high speed on a large workspace. For machining systems having high precision positioning with a long stroke, it is necessary to examine the repeatability of the reference position decision. Though ball-screw driven linear stages equipped with linear scale have high precision feed drivers and a long stroke, they have some limitations for reference position decisions if they have not been equipped with an accurate home sensor. This study is performed to experimentally examine the repeatability for home position decision of a photo micro sensor as a home switch of a ball-screw driven linear stage by using a capacitance probe.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 심포지엄 논문집 정보 및 제어부문
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• pp.234-236
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• 2006

Because of its long measurement range and ultra-precise resolution. the heterodyne laser interferometer systems are very common in various industry area such as semiconductor manufacturing. However the periodical nonlinearity property caused from frequency mixing is an obstacle to improve the high measurement accuracy in nanometer scale. In this paper to minimize the effect of nonlinearity, we propose an adaptive nonlinearity compensation algorithm. We first compute compensation parameters using least square (LS) with the capacitance displacement sensor as a reference input. We then update the parameters with recursive LS (RLS) while the values are optimized to modify the elliptical phase into circular one. Through comparison with some experimental results of laser system, we demonstrate the effectiveness of our proposed algorithm.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2007년도 심포지엄 논문집 정보 및 제어부문
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• pp.86-88
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• 2007

In the semiconductor manufacturing industry, the heterodyne laser interferometer plays as an ultra-precise measurement system. However, the heterodyne laser interferometer has some unwanted nonlinearity error which is caused from frequency-mixing. This is an obstacle to improve the measurement accuracy in nanometer scale. In this paper we propose a compensation algorithm based on RLS(recursive least square) method and artificial intelligence method, which reduce the nonlinearity error in the heterodyne laser interferometer. With the capacitance displacement sensor we get a reference signal which can be transformed into the intensity domain. Using the back-propagation Neural Network method, we train the network to track the reference signal. Through some experiments, we demonstrate the effectiveness of the proposed algorithm in measurement accuracy.

• 한국정보전자통신기술학회논문지
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• 제7권4호
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• pp.200-204
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• 2014

가정에서 사용하는 LPG는 용량을 측정할 수 있는 방법이 없기 때문에 공급자에 의존할 수밖에 없었다. 또한 LPG 가스 교체 시기를 알 수 없기 때문에 가스 용량을 측정하여 교체시기에 대한 경보를 필요로 하고 있다. 본 연구에서는 사용자와 공급자가 믿고 신뢰할 수 있는 있도록 가스통을 교체할 시기를 알려 주고, 공급가스 용량을 쉽게 알 수 있도록 하기 위해 홀 효과 센서를 적용하여 가스 용량 측정 밸브 시스템을 개발하였다.

• 한국전기전자재료학회논문지
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• 제21권9호
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• pp.783-788
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• 2008

We suggest a CNT-based gas sensor for breath alcohol measurement. The sensor was composed of single-walled carbon nanotubes (SWCNTs) thin film on flexible PES (polyethersulfone) substrate, and the SWCNTs thin film was formed by multiple spray-coating with SWCNTs solution which was well-dispersed, highly controlled and functionalized in ethanol solvent. In this work, three types of SWCNTs thin films were deposited with changes in the number of spray-coatings to 20, 40 and 60 times in order to compare electrical response properties of the SWCNTs thin films. from the fabricated sensors, conductance and capacitance responses were measured and discussed. Alcohol gas sensors have been commercialized widely as gauge for breath alcohol measurement which is applicable to checking whether car drivers are drinking-driving or not. Our alcohol gas sensors showed good sensitivity and linearity even at room temperature.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2022년도 봄 학술논문 발표대회
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• pp.61-62
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• 2022

The unit quantity is an important factor influencing the durability, workability, and quality of concrete. Methods for measuring the unit quantity include a high frequency heating method, a unit volume mass method, a capacitance method, and a microwave method. However, these methods have disadvantages of poor measurement method, time required, and accuracy, and a relatively experimental method compensating for these disadvantages was used to measure the unit quantity using a high frequency main sensor (FDR) capable of simple and fast measurement. In addition, the unit quantity was evaluated by analyzing the measurement data through deep learning.

• 한국방사선학회논문지
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• 제16권7호
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• pp.969-974
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• 2022

디지털 엑스레이 디텍터 영상 취득에 있어 동적 범위를 최대화하고 영상지연을 최소화하기 위해서는 엑스레이 영상센서의 픽셀내 포토다이오드에 존재하는 잔류 정전기생용량을 빠르고 완전하기 제거하는 것이 매우 중요하다. 이러한 요구사항은 특히 고속 프레임과 낮은 영상지연이 필요한 산업용 2D/3D 자동화 엑스레이 검사와 의료용 CT 엑스레이 디텍터에 특별히 요구된다. 본 연구는 리셋 박막트랜지스터, 리드아웃 박막트랜지스터 그리고 포토다이오드로 픽셀이 구성된 듀오픽스^TM 엑스레이 영상센서를 처음으로 제안한다. 듀오픽스^TM 엑스레이 영상센서의 구동을 검증하기 위해 105 ㎛의 픽셀 사이즈, 347 mm × 430 mm의 영상영역 그리고 3300 × 4096의 픽셀 (13.5M pixels)을 갖는 듀오픽스^TM 엑스레이 영상센서를 설계, 제작하여 모듈테스터와 영상취득 프로그램을 통해 영상을 취득하였다.

• 한국콘텐츠학회논문지
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• 제8권6호
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• pp.8-15
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• 2008

본 논문에서는 광 마이크로폰의 주파수 응답특성 분석을 위해 시스템을 제안하고 구현하였다. 현재 사용되어지고 있는 캐패시턴스 마이크로폰과 광섬유 전송로형 광 마이크로폰(FOM)은 낮은 지향성과 크기, 무게, 비싼 가격 등에서 단점을 나타내고 있다. 반면 제안된 광 마이크로폰은 저가의 소자로 구성할 수 있으며, 소형, 경량화, 높은 지향성 등의 장점을 갖는다. 본 논문에서 제안하는 광 마이크로폰의 헤드 부는 인가된 음압에 따라서 전후로 움직이게 되어있으며, 반사판이 부착되어 있는 형태로 구성되어 있다. 광 헤드와 진동판사이의 거리를 변화시켜가며 응답특성을 측정하여 선형성과 민감도가 최대인 지점을 동작 점으로 결정하였다. 컴퓨터 기반 음향 측정/분석 프로그램인 Smaart Live와 USBPre를 사용하여 음향 신호의 주파수를 변화시켜 가며 구현한 광 마이크로폰의 광전 변환된 신호의 출력을 측정하였으며, 기존의 캐패시턴스 마이크로폰과 비교 분석하였다. 측정된 광 마이크로폰은 비교 콘덴서 마이크로폰과 거의 동일한 출력 특성을 나타내었으며, 주파수 대역폭은 약 ${\pm}3$[dB] 이내에서 300[Hz]-3[kHz] 정도의 성능을 나타내었다.