• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2000년도 추계학술대회 논문집
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• pp.39-42
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• 2000

Cutrent technological development toward miniaturization requires smaller components. These components usually generate complex multi-DOF motions other than simple 1-DOF motlon. Therefore it is essential to develop measurement methodology for 6-DOF motions. In this paper, a new 6-DOF measurement system for milli-struchlre is presented. This methodology basically employs the Optical Beam Deflection Method (OBDM) with a diffraction grating. A laser beam is emitted toward the difliaction grating which could be attached on the surface of a milli-structue and the incident ray is dif'||'&'||'acted in several directions. Among these difliacted beams, $0^{th}$ and $\pm$ $1^{th}4" order difkicted rays are detected by 4 Quadrant Photodiodes. From coordinate values fram each detector, we can get information for 6-DOF motions with lineariration method, Required resolutions for milli-struchue measurement are suh-micrometer in translation and arcsec in rotation. Experimental results indicate that proposed system has possibility to satisfy this requirement.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2005년도 추계학술대회 논문집 Vol.18
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• pp.321-322
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• 2005

In this paper, we dealt with a partial discharge(PD) measurement system that has been accepted as an effective and non-destructive technique for estimating reliabilities of low-voltage electrical and electronic components. Calibration tests on laboratory set-up have shown that the PD measurement system has a stable sensitivity of 37.6 mv/pC. In an application test on photo coupler, we could detect 0.1 pC level of partial discharge at the applied voltage of AC 520 $V_{peak}$.

• 한국전자통신학회논문지
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• 제8권12호
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• pp.1971-1978
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• 2013

구취에 대한 성인들의 대상자별 구취를 측정하고 성분을 분석하여 각 요인별로 구취성분과의 상관관계를 조사함으로써 효율적인 구취제거 방안을 마련하는데 기초자료로 활용하고자 2011년 2월 1일부터 2012년 1월 30일까지 12개월간 대전과 충남에 소재한 각 1개의 치과병원 외래환자 80명씩 총 160명을 대상으로 하였다. 분석결과, Oral chroma 구취측정치에서 hydrogen sulfide의 측정치가 112ppb 이상인 경우는 9.4%이었고, methyl mercaptan의 측정치가 26ppb 이상인 경우는 20.6%, dimethyl sulfide의 측정치가 8ppb이상인 경우는 44.0%로 세 가지 성분 중 가장 높은 수치를 나타냈다. oral chroma로 측정한 methyl mercaptan성분과 dimethyl sulfide성분만 0.578로 높은 양의 상관관계가 있는 것으로 나타났다. 이에 구취를 유발하는 다양한 성분들에 대하여 다각적인 연구가 필요할 것으로 사료된다.

• 한국정보처리학회논문지
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• 제6권9호
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• pp.2365-2372
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• 1999

재사용도 측정 모델은 다음 조건을 만족해야 한다. 1) 측정 속성(척도)들과 컴포넌트들을 쉽게 삽입 삭제할 수 있어야 한다. 2) 타당성에 근거하여 컴포넌트들을 정량적으로 평가할 수 있어야 한다. 3) 가정된 지식을 요구하지 않아야 한다. 4) 각 측정 속성들의 중요도를 객관적으로 산출할 수 있어야 한다. 따라서 본 논문에서는 위의 조건들을 만족시킬 수 있는 재사용 컴포넌트들의 재사용도 측정 모델을 제안한다. 제안된 모델은 적합한 측정 인자들을 선택하고, 러프집합을 이용하여 그들의 중요도를 산출한다. 다음으로 컴포넌트의 재사용도를 측정하기 위해서, 퍼지 적분을 이용하여 측정 인자들의 중요도와 측정값을 종합한다. 마지막으로 기능 중심 컴포넌트들에 제안된 모델을 적용하고, 통계적 방법으로 모델의 타당성을 보인다.

• Journal of the Optical Society of Korea
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• 제19권6호
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• pp.649-657
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• 2015

We present a surface color measurement including quantities of surface color, methods, and uncertainty evaluation. Based on a relation between spectral reflectance and surface color, we study how an uncertainty of spectral reflectance propagates to surface color. In analyzing the uncertainty propagation, we divide the uncertainty into uncorrelated components, fully correlated components, and correlated components with spectrally varying correlations. As an experimental example, we perform spectro-reflectometric measurements for ceramic color plates. With measured spectral reflectance and its uncertainty evaluation, we determine surface color and analyze uncertainties of the ceramic color plates.

• Current Optics and Photonics
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• 제2권6호
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• pp.606-611
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• 2018

Measurement of the nonlinear optical coefficients is not an easy task since it requires complicated experimental setup and analysis. We suggest an easy way to estimate the relative nonlinear optical tensor components by direct measurement of the output powers of the second harmonic generation and spontaneous parametric down conversion experiments. The experiments were done in quasi-phase-matched type-0 as well as type-1 interactions at similar pump wavelengths in a 5% MgO-doped periodically poled $LiNbO_3$ crystal to obtain the ratio of the nonlinear optical tensor components $d_{33}/d_{31}$ in each experiment. The obtained ratios were then compared with the previously ascertained values [J. Opt. Soc. Am. B, 14, 2268-2294 (1997)].

• Journal of Electrical Engineering and Technology
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• 제7권6호
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• pp.845-851
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• 2012

Power system loads have a significant impact on a system. Although it is difficult to precisely describe loads in a mathematical model, accurately modeling them is important for a system analysis. The traditional load modeling method is based on the load components of a bus. Recently, the load modeling method based on measurements from a system has been introduced and developed by researchers. The two major components of a load modeling problem are determining the mathematical model for the target system and estimating the parameters of the determined model. We use the composite load model, which has both static and dynamic load characteristics. The ZIP model and the induction motor model are used for the static and dynamic load models, respectively. In this work, we propose the measurement-based parameter estimation method for the composite load model. The test system and related measurements are obtained using transient security assessment tool(TSAT) simulation program and PSS/E. The parameter estimation is then verified using these measurements. Cases are tested and verified using the sample system and its related measurements.

• 한국지능시스템학회논문지
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• 제6권4호
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• pp.17-26
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• 1996

Software reuse is a method which increases the productivity of software, nevertheless software reuse is not employed well in real world. One of the important factors occured this proplem is insufficinet inforamtion in understanding and adapting the existing components. Understanding and adapting of components can be measured emplying user's experience and the attributes which the existing programs provide. Especially user's experience is very important attribute in understanding and adapting components, and it can't be measured by simple metrics. We propose in this paper, the reuse-easingess measurement system using fuzzy logic. This system can provide information regarding reusing components by reflecting user's experience from user's point of view, and can reduce the reuse effort signinificantly.

• Journal of electromagnetic engineering and science
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• 제15권4호
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• pp.250-257
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• 2015

This paper presents an experimental measurement system for 3-6 GHz microwave tomography (MT) of the breast. The measurement system is constructed as a minimal test bed to verify key components such as the sensing antennas, radio frequency (RF) transceiver, sensing mechanism, and image reconstruction method for our advanced MT system detecting breast cancer at an early stage. The test bed has eight RF channels operating at 3 to 6 GHz for high spatial resolution and a two-axis scanning mechanism for three-dimensional measurement. The measurement results from the test bed are shown and discussed.

• 한국산학기술학회논문지
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• 제16권6호
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• pp.3672-3679
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• 2015

열차 운행에 따른 전장품들의 발열을 예측하기 위해 동력차 내 벽면온도 및 외부 유출 온도 및 풍속, 외부로부터 유입되는 유입 공기의 유입 온도 및 속도를 측정하였다. 이를 위하여 적외선카메라를 이용하여 고속열차 내부의 전장품 및 벽 표면의 온도를 측정하였다. 또한 전장품에서 발생하는 열은 고속열차 천장에 설치된 덕트를 통하여 외부로 배출된다. 배출되는 공기의 온도 및 속도를 측정하였고, 외부에서 동력차 내부로 들어오는 유입공기의 온도 및 속도도 측정하였다. 또한 부착형 온도센서를 이용하여 동력차 내부의 벽 및 전장품 표면에서의 온도를 측정하였다. 측정된 결과를 이용하여 열차 주행에 따른 전장품의 발열 특성을 분석하였다.