• 기술혁신학회지
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• 제4권1호
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• pp.110-126
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• 2001

In this study, we survey the demand of precision measurement technology including instrument and technical manpower in Korean industry and institution. Also this study is purposed to improve the metrological technology by suggesting the solution of technical problems.

• Journal of Biosystems Engineering
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• 제35권6호
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• pp.443-449
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• 2010

A machine vision-based instrument to measure a droplet size spectrum of a spray nozzle was developed and tested to evaluate its accuracy on measuring spray droplet sizes and classifying nozzle sizes. The instrument consisted of a machine vision, light emitting diode (LED) illumination and a desktop computer. The illumination and machine vision were controlled by the computer through a C++ program. The program controlled the machine vision to capture droplet images under controlled illumination, and processed the droplet images to characterize the droplet size distribution of a spray nozzle. An image processing algorithm was developed to improve the accuracy of the system by eliminating random noise and out-of-focus droplets in droplet images while measuring droplet sizes. The instrument measured sizes of the three different balls (254.0, 497.8 and $793.8\;{\mu}m$) and the measurement ranges were $241.2-273.6\;{\mu}m$, $492.9-529.6\;{\mu}m$ and $800.8-824.1\;{\mu}m$ for 254.0-, 497.84- and $793.75-\;{\mu}m$ balls, respectively. Error of the measured droplet mean was less than 3.0 %. Droplet statistics, $D_{V0.1}$, $D_{V0.5}$ and $D_{V0.9}$, of a reference nozzle set were measured, and droplet size spectra of five spray nozzles covering from very fine to extremely coarse were measured to classify spray nozzle sizes. Ninety percent of the classification results of the instrument agreed with manufacturer's classification. A comparison study was carried out between developed and commercial instruments, and measurement results of the developed instrument were within 20 % of commercial instrument results.

• 한국정밀공학회지
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• 제27권4호
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• pp.33-39
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• 2010

Manufacturing accuracy of a precision instrument was essential to stability and efficiency of the product. Accordingly, geometrically accuracy management of precision instrument was very becoming the technique in order to design and manufacturing for machine. In this study, Measuring System is developed for extra long roller using non-contact sensor. Futhermore, It's studied by Geometric Tolerance. Exact roundness is obtained to Least Squares method from the reference circle of measured data. Measuring System is analyzed point of measurement and straightness of extra long roller is evaluated by FEM.

• 대한임베디드공학회논문지
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• 제9권4호
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• pp.219-227
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• 2014

Natural disasters such as a ground collapse and a landslide have broken out due to the climate change of the Korea and the reckless expansion of cities and roads. The climate changes and the reckless urbanization have made the ground weak. Thus, it is important to keep a close eye on the highly weakened landslide and to prevent its natural disasters. In order to prevent these disasters, this paper presents a system of recognizing the road slide condition by measuring the displacements using laser scanner instrument. The previous system of monitoring the road slide has some problems as inaccurate recognition due to using only images from a camera, or expensive system such as artificial satellites and aircraft systems. To solve this problem, our proposed system uses the 3D range data from the laser scanner for measuring the accurate displacement of the road slide and optical flows from the Lucas-Kanade algorithm for recognizing the road slide in the image.

• 전기학회논문지P
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• 제59권4호
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• pp.423-427
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• 2010

Portable sheet resistance-measuring instrument using the dual-configuration Four-Point Probe method is developed for the purpose of precisely measuring the sheet resistance of conducting thin films. While single-configuration Four-Point Probe method has disadvantages of applying sample size, shape and thickness corrections for a probe spacing, the developed instrument has advantages of no such corrections, little edge effects and measuring simply and accurately the sheet resistance between $0.2\Omega/sq$ and $2k\Omega/sq$.

• 대한기계학회논문집
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• 제13권5호
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• pp.862-874
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• 1989

본 연구에서는 반경법 진원도 측정기의 회전정도와 편심에 의한 영향을 제거 하여 시험편의 형상오차와 측정기 자체의 오차특성을 분리함으로써 진원도 측정의 정도를 향상시킬 수 있는 방법에 대하여 검토하였다. 진원도의 표시법으로는 최근 최소영역법에 의해 규정되는 경우가 많으나 이는 일반적으로 많은 연산시간을 요구 하므로 비경제적인 면이 있다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2001년도 추계학술대회 논문집
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• pp.156-162
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• 2001

Current collection performance on-line tests for a Korean High Speed Train being developed in G7 project is scheduled to start in June, 2002. In this paper, preparatory efforts for measuring contact forces which is regarded as one of major measuring items in the test are introduced. Specifically speaking, review of frequencies related with contact force fluctuations, brief of contact force measuring algorithm, review of measuring instrument specifications and development of a data acquisition program are presented.

• 종양간호연구
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• 제1권1호
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• pp.18-31
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• 2001

This Research was designed to develop an instrument that can be used for measuring and analysing the degree of the quality of life of the Allogenic bone marrow transplantation survivors and to provide basic data to help them attain a better quality of life. The subjects of this study were a total of 101 people who were undergone Allogenic bone marrow transplantation and were over 100 days after transplantation. Data were collected during the period from September 3 to December 2. 2000. In Developing this instrument, the researcher established a conceptual framework based on the result of previous research, interview of patients and medical staff and researcher's experience. The scale for this instrument consisted of 51 items. Responses were obtained from the respondents through a self reporting method and each item had a possible score of 5. The collected data were analyzed using the SPSS program. The reliability of the scale was tested by Cronbach‘s alpha. For the examination of the component factors of the measuring instruments, factor analysis method was used. Examination of the difference in the quality of life as related to demographic variables was done using t-test, analysis of variance(ANOVA). For the examination of the major variables influencing the quality of life, Pearson's Correlations was used. The results were as follows: (1) The reliability of the instrument was 0.90 (Cronbach's alpha) (2) The validity of the instrument was tested by factor analysis. The result of the factor analysis of the 51 items is making up the instruments were classified into the following factor; emotional state, Interpersonal problem, physical problem, spiritual state, social problem, decrease of physical energy, physical problem-eye, physical problem-skin and mucosa, health awareness, elimination problem, worry about health, financial problem, sexual problem. (3) Demographic variables related to quality of life is the time after transplantation. GVHD experience, lose of job. Age at the transplantation, diagnosis, type of the transplantation, marital status, monthly income, educational background, sex, religion are not related to the quality of life.

• 한국과학교육학회지
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• 제28권2호
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• pp.139-149
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• 2008

본 연구에서는 과학 영재 학생들의 과학적 문제발견 능력을 측정하기 위해 타당도와 신뢰도가 높은 검사 도구를 개발하였다. 먼저, 과학적 문제발견 능력에 대한 조작적 정의를 바탕으로 5개의 하위 평가 요소(적절성, 융통성, 독창성, 정교성, 가치 판단)를 선정하였으며 평가 기준을 구안하였다. 개발된 검사 도구는 내용 및 평가 기준에 대해 과학교육 전문가의 타당도 검증을 거친 후 과학 고등학교 학생들에게 투입되었으며, 채점 결과를 바탕으로 구인 타당도를 검증받았다. 또한 채점자간 신뢰도는 대체로 높게 나타났으며, 문항 난이도 와 변별도 역시 적절한 것으로 나타났다. 앞으로 과학적 문제발견 능력에 대한 합의된 정의를 도출해내어야 하며 평가의 객관성을 확보하기 위한 더 나은 방안을 강구해야 한다.

• 과학교육연구지
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• 제43권2호
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• pp.258-269
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• 2019

이 연구는 핵심역량의 관점에서 STEAM 교육의 효과를 조사할 수 있는 'STEAM 교육 핵심역량 조사 도구'를 개발하였다. STEAM 교육과 관련된 국내 외 선행연구 고찰을 바탕으로 전문가 협의회를 통한 반성적 재검토와 외부 전문가의 검증을 통하여 조사도구의 초안이 완성하였다. 개발된 조사도구는 학생 408명을 대상으로 예비 조사를 실시하였고, 신뢰도 확인과 확인적 요인 분석과 같은 통계 분석을 통하여 최종 완성하였다. 최종 개발된 조사도구의 문항은 융합(7문항), 창의(11문항), 도전(5문항), 배려(9문항)의 총 32문항으로 구성되었다. 각 요인별 Cronbach's ${\alpha}$값은 .849에서 .929로 높은 신뢰도를 나타내었다. 이 연구를 통해 개발된 조사도구는 STEAM 교육의 효과를 학생의 핵심역량 관점에서 조사하는데 활용될 수 있을 것이다.