• 한국광학회:학술대회논문집
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• 한국광학회 2004년도 제15회 정기총회 및 동계학술발표회
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• pp.62-63
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• 2004

• 한국섬유공학회:학술대회논문집
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• 한국섬유공학회 1997년도 춘계학술발표회 논문집
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• pp.127-133
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• 1997

Authors measured the apparent contact angle in a yarn using microscope because it gives a useful information in the evaluation of comfort factors in fabrics. The mechanical stage of microscope was designed and built to facilitate this measurement. Variables examined were the fiber type, the twisting number, and the fluid type. All produced significant effect most of which could be rationalized based on the known concepts. The methodology used and the results obtained are discussed in detail.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2003년도 춘계학술대회
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• pp.857-862
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• 2003

In this paper, we concern for development of precise measuement system for civil structure by using one chip microprocessor based on communication system. The datalogger is developed by using 80C196KC microprocessor. It has RF communication modul and data acquisition function for several kinds of sensors such as load cell, tilt-meter, strain gauge, tension meter, themocouple and so on. The data is acquisited by datalogger is sent to a main server which is located at central monitoring office. The server has a function suppervising several data points located at civil structures, it analyzes the data and shows the data graphically. The effectiveness of the developed system is proven through experimental results by an application for the bridge of Nakdong river edge in Busan, Korea.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1997년도 추계학술대회 논문집
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• pp.220-223
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• 1997

Moire topography method is a well-known non-contacting 3-D measuement method. Recently, the automatic 3-D measurement by moire topography has been required since the method was frequently applied to the engineering and medical fields. 3-D measurement using projection moire topography is very attractive because of it's high measuring speed and high sensitivity. In this paper, using two-wavelength method of projection moire topography tested to measuring object with the 2x-ambiguity problem. Experimental results prove that the proposed scheme is capable of finding absolute fringe orders, so that the 2x-ambiguity problem can be effectively overcome so as to treat large step discontinuities in measured objects.

• 한국광학회지
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• 제5권2호
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• pp.198-203
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• 1994

구면의 긴 곡률반경을 측정하기 위하여 양방향 층밀리기 간섭계를 이용하는 새로운 방법을 제시하였다. 시준장치의 광원을 미세이동시켜 출사광선의 곡률중심과 시험구면의 초점을 일치시키는 비시준 조명방법을 사용하였으며 양방향 층밀리기 간섭계를 사용하여 시험구면에서 출사한 광선의 시준 여부를 정확히 확인하였다. 이 방법은 렌즈의 긴 초점길이도 측정할 수 있으며 여러가지 변수에 의한 측정정확도를 자세히 분석하였다.

• Journal of Nutrition and Health
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• 제30권3호
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• pp.277-285
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• 1997

The purpose of this study was to investigate the relationship among nutrient intake, life style, and serum lipids level in 108 healthy middle-aged men in Taegu. A convenient method was to assess nutritional intake. Anthropometric measuement of body weight and hight were measured and average energy expenditure was calculated. The mean body mass index(BMI) was 22.8$\pm$2.4 and it was in the middle of the mean BMI of Korean men. Obesity rate of study subject were 13.2%. Daily energy intake was not sufficient as 88.4% of recommended dietary allowances and the energy percentage of carboydrate, fat protein was 65 : 21 : 14. Mean intake of vitamin A, B1, C and Ca were lower than RDA. There was a highly significant negative correlation between the systolic blood pressure and calcium intake(r=-0.28, p<0.05). Smokers showed significantly higher blood glucose than non-smokers. Skipping meals and uneven diurnal distribution(no breakfast and large evening meals) are associated with high triglyceride level in this population. There was a highly significant correlation between body weight and plasma lipids. Energy expenditure was negatively correlated with plasma triglyceride level. Especially, atherogenic index was significantly lower in job-time physically active worker than that in sedentary worker. Above data provides valuable imformation to the community for program planning as well as to health providers who work individual male adults to meet their nutrition needs and to control blood lipids.

• 한국연소학회지
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• 제7권2호
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• pp.7-14
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• 2002

The probability density functions (PDF) of temperature were measured by coherent anti-Stokes Raman Spectroscopy (CARS) in flames of gas turbine combustor sector rig of an aero-engine. The combustor was operated at simulated ground idle conditions with standard kerosene fuel. Temperature PDFs had been measured near fuel nozzle with change of rotation of a swirler and existence of a prefilmer. The characteristic features of temperature PDFs showed the variation of combustion configurations at four experimental conditions. Without a prefilmer, large recirculation of high temperature gas was expected in the co-flow condition and un vaporized fuel fragments were detected in the counter-flow condition. With a prefilmer, the enhanced mixing increased combustion intensity near fuel nozzle in the counter-flow condition and the flame was attached far from the fuel nozzle in the co-flow condition.

• 한국해양공학회:학술대회논문집
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• 한국해양공학회 2001년도 춘계학술대회 논문집
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• pp.150-153
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• 2001

In this paper, the tensile test of three kinds of the specimens was performed. Type I specimen is without notch and type II, III specimens have a radius of semi-circular edge crack of 2.5mm, 4.0mm. The tensile load(20kN and 30kN) was applied to the specimen by Universal Testing Machine. 3D-ESPI system and strain gauge measured simultaneously the strain in the center of the specimen and near the edge crack. The test results were compared with each other. Moreover, the stress concentration factor based on geometric information was calculated to confirm the accuracy of the strain measured by 3D-ESPI system. The calculated strain was compared with the measured one by 3D-ESPI system. As a result, it was confirmed that 3D-ESPI system measured the right strain near the semi-circular edge crack of the specimens.

• 한국초등과학교육학회지:초등과학교육
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• 제41권4호
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• pp.658-672
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• 2022

초등학교 과학에서 속력 관련 단원의 독특한 교수·학습 곤란은 주로 학생의 수학적 사고력 및 속력의 측정과 관련된 절차적 지식의 부족에 기인한 것으로, 교육과정 및 교과서는 이점을 고려하여 구성할 필요가 있다. 속력 단원의 교육과정 및 교과서 내용 구성과 관련된 시사점을 얻기 위하여 2007 개정 교육과정부터 2015 개정 교육과정까지 3개 교육과정 및 이에 따른 교과서의 속력 관련 단원의 구성 체계와 내용을 살펴보고, 선행 연구에 비추어 적절성을 분석하였다. 분석 결과를 통해 현재의 내용 구성은 이동 거리와 시간 및 속력 사이의 입체적인 관계를 파악하기 보다는 암기에 의한 기계적 알고리즘을 통해 물체의 속력만을 계산할 위험이 있어 이중 수직선과 같은 시각화 모형 및 간단한 수를 활용하여 속력의 의미를 단계적으로 학습할 수 있도록 재구성할 필요가 있다는 점을 밝혔다. 또한 조사를 통해 얻은 자료를 이용하여 물체의 운동을 해석하는 활동보다는 실제 운동하는 물체의 이동 거리와 걸린 시간을 직접 측정하여 그래프로 나타내고 분석하도록 함으로써 과정 기능 등 탐구 수행 능력을 향상시키는 것의 필요성에 대해 논의하였다. 마지막으로 적용 차시에서 현재의 교육과정과 교과서에서는 일상생활과의 연계를 강조하고 있지만 단원의 주된 학습 내용인 운동학과는 다소 다르게 동역학과 관련된 내용을 다루고 있어 학습한 내용을 익히고 활용할 수 있도록 속력과 관련된 사례를 중심으로 내용을 새롭게 구성할 필요가 있다는 점을 밝혔다. 새 교육과정 및 교과서에서는 학습하기 어렵고 지도하기 까다로운 내용을 제외하기 보다는 과학의 가치를 깨닫고 과학 학습을 향유할 수 있도록 핵심 주제를 체계적으로 깊이 학습할 기회를 제공할 것을 제안한다.