• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2000년도 제15차 학술회의논문집
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• pp.167-167
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• 2000

This study aims at the development of REC sensor causing the gauge error in the hot strip rolling process, and the improvement of the hydraulic AGC (Automatic Gauge Control) system. The gauge error outbreaks from the various reasons, however, mainly the roll eccentricity is considered to cause a such kind of error. In the study, the REC (Roll Eccentricity Control System) sensor is designed using sensor An On - line test of the system shows the comprehensive effects of controlling the gauge error of the hot strip. On - Line test shows the possibility of enhancing the accuracy for gauge.

• 산업기술연구
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• 제22권B호
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• pp.89-93
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• 2002

When testing products before shipment to the customer, quality characteristics are measured to decide whether or not their values are between the specification limits. Unfortunately, this testing procedure can lead to incorrect decisions because of gauge error. That is, good products can erroneously be qualified as bad, and bad products as good, and this has consequences for producer's and consumer's risk. In cases of such as this, the compressed gauge limit can be used to achieve the desired product quality level dictated by the manufacturer or the customer. A compressed gauge limit is a limit set by the manufacturer on a test gauge that is tighter than the specification limit established by the customer. The compressed gauge limits should be set at levels to achieve the defect levels desired by the customer and simultaneously minimize the loss of good product that is rejected due to errors in the gauges. In this article, the models for determining the defect levels and the losses obtained by adding compressed gauge limits will be developed. A response surface model approach is utilized which allows an optimal operating condition to be generated relatively easily.

• 한국환경과학회지
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• 제18권10호
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• pp.1115-1121
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• 2009

The purpose of this study is to estimate the impact of rainfall measurement according to the installation conditions of rain gauges: windbreak, grass mat, installation elevation or obstacle. Rain gauges were installed by the standards of Korea Meteorological Administration(KMA), and the rainfall measurement was conducted daily unit during two years(2007~2008). In conclusion, observed error of rain gauge did not affect whether windbreak was installed or not. If there is the obstacle around rain gauge, average error rate was increased about 3.3%: (2007year-2.49%, 2008year-4.10%). If rain gauge is located in a high place, average error rate was increased about 4.89%. Additionally, the observed error of rain gauge according to the wind speed has a positive correlation with obstacle and installation elevation and has a negative correlation with windbreak and has no affection with grass mat.

• 전기전자학회논문지
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• 제16권1호
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• pp.34-44
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• 2012

본 논문은 스트레인 게이지(strain gauge)식 로드셀(loadcell)의 대표적인 크립오차(creep error)에 대해서 디지털 신호처리방식을 사용한 실용적인 보상법(compensation method)을 제안한다. 신호의 보상방법은 로드셀의 출력응답을 실측해서 보상상수(시정수)와 보상계수를 결정한 후 마이크로프로세서의 내부메모리에 보상상수와 보상계수를 저장한 후 중량값을 디지털로 표시할 시점에 마이크로프로세서에서 연산처리한 크립에러 보상처리값을 로드셀의 출력신호에서 실측한 에러값과 서로 상쇠시키는 보상방법이다. 추가적으로 보상방법을 디지털전자저울에 직접 적용 시험하기 위해서 전용의 보상소프트웨어를 제작한 후 디지털전자저울의 크립특성을 실측해서 보상전 정격출력의 크립오차 0.03%의 로드셀을 정밀디지털전자저울의 허용오차 범위인 0.01%~0.001%이상으로 복잡한 연산처리 없이 정확하게 직접 보상처리하는 실용적인 방법을 제안했다.

• 한국경영과학회:학술대회논문집
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• 대한산업공학회/한국경영과학회 1991년도 춘계공동학술대회 발표논문 및 초록집; 전북대학교, 전주; 26-27 Apr. 1991
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• pp.379-401
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• 1991

A comprehensive computer software has been implemented in conjunction with the software for volumetric error generator, to assess simulation on specific measurement tasks. The simulation algorithms have been developed for major measurement tasks, such as step gauge, ring gauge, sphere gauge, and cylinder gauge simulations etc. Verification and practical applications of the developed module have shown its efficiency and validity.

• 대한수학회보
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• 제46권4호
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• pp.627-644
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• 2009

The gauge-Uzawa method which has been constructed in [11] is a projection type method to solve the evolution Navier-Stokes equations. The method overcomes many shortcomings of projection methods and displays superior numerical performance [11, 12, 15, 16]. However, we have obtained only suboptimal accuracy via the energy estimate in [11]. In this paper, we study semi-discrete gauge-Uzawa method to prove optimal accuracy via energy estimate. The main key in this proof is to construct the intermediate equation which is formed to gauge-Uzawa algorithm. We will estimate velocity errors via comparing with the intermediate equation and then evaluate pressure errors via subtracting gauge-Uzawa algorithm from Navier-Stokes equations.

• 품질경영학회지
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• 제24권3호
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• pp.145-159
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• 1996

In today's organization, measurement plays a crucial role in helping improve process or quality. In this paper, we review the measurement error study, classical gauge repeatability and reproducibility study, and designed experiment suited for the determination of the measurement capability. Measurement error study is very simple to use but is rather crude. Hence, it should be used as a preliminary study to determine whether further study is necessary. Classical gauge repeatability and reproducibility (GR&R) study is the most common technique for evaluation of gauge capability. It calculates a percentage that relates the repeatability, reproducibility, and overall R&R to the specification range for the parameter measured. Hence, the individual repeatability and reproducibility statistics will indicate the area on which to concentrate. However, GR&R study only gives a point estimate of each component, which leaves a room for improvement. It is always good to integrate the use of control charts to ascertain the statistical stability of the measurement process. The tools of statistical experimental design are available for a comprehensive design and analysis of the measurement process. Hence, in this paper, we present gauge capability analysis as an experimental design problem and compare it with the classical GR&R study.

• 한국항행학회논문지
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• 제23권2호
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• pp.214-220
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• 2019

산업현장에서의 안전사고 빈도가 높은 지게차 전복의 주요 원인인 과적을 방지하기 위해 개발된 앵커(anchor) 볼트 형태의 strain 게이지 센서의 초기 값 오차를 보정하는 방법을 제안하였다. Strain 게이지 센서의 초기 값 오차는 앵커 볼트의 물리적이고 기계적 오차와 환경적 문제에기인하는 것을 확인하였다. 이러한 원인들을 제조 공정에서 제거하는 것은 본 연구의 범위를 벗어나는 것이기 때문에 제반 원인들을 고려한 보정 값을 찾고, 이 보정 값으로 strain 게이지 센서부를 구성하는 ADC 모듈의 초기 값을 보정하는 방법을 적용하였다. 보정 값 도출을 위하여 선형 보간법을 채택하였다. 도출한 보정 값을 4개의 strain 게이지 센서에 적용하여 시험한 결과 4개의 센서 모두 실제 중량 값과의 차이가 5% 이내가 되는 것을 확인하였다. 아울러 초기 값 보정 전에는 센서들의 ADC 값과 적재 중량 실제 값의 상관성이 없었던 점도 동시에 해결할 수 있었다.

• 한국농공학회지
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• 제38권2호
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• pp.108-122
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• 1996

This study was to introduced estimation model for optimum probabilistic rainfall intensity on hydrological area. Originally, probabilistic rainfall intensity formula have been characterized different coefficient of formula and model following watersheds. But recently in korea rainfall intensity formula does not use unionize applyment standard between administration and district. And mingle use planning formula with not assumption model. Following the number of year hydrological duration adjust areal index. But, with adjusting formula applyment was without systematic conduct. This study perceive the point as following : 1) Use method of excess probability of Iwai to calculate survey rainfall intensity value. 2) And, use method of least squares to calculate areal coefficient for a unit of 157 rain gauge station. And, use areal coefficient was introduced new probabilistic rainfall intensity formula for each rain gauge station. 3) And, use new probabilistic rainfall intensity formula to adjust a unit of fourteen duration-a unit of fifteen year probabilistic rainfall intensity. 4) The above survey value compared with adjustment value. And use three theory of error(absolute mean error, squares mean error, relative error ratio) to choice optimum probabilistic rainfall intensity formula for a unit of 157 rain gauge station.

• 생물환경조절학회지
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• 제7권3호
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• pp.268-274
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• 1998

열수지 경류센서에 의한 멜론의 흡수량 측정오차는 최저 0.3%에서 최대 31.8% 범위 내에 있었으며, 일사량 20MJ.m$^{-2}$ .d$^{-1}$에서는 오차가 적었으나 일사량이 이보다 많아지면 많아질수록 센서측정 경류량이 실측양액 소비량보다 적어지는 경향이었고 일사량이 적어질수록 센서측정 경류량이 실측양액 소비량보다 많아지는 경향이었다. 센서간의 오차는 최저 0.1%에서 최대 13.0%의 오차율을 보였다. 열수지센서측정 경류량은 일사량이나 온도와 고도의 부의 상관관계를 보였다. 그러므로 이를 이용 보정계수를 산출하면 보다 정확한 멜론의 경류량을 측정할 수 있을 것으로 판단되었다.