• 한국도로학회지:도로
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• v.19 no.2
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• pp.18-23
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• 2017

• The Journal of the Acoustical Society of Korea
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• v.4 no.3
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• pp.53-57
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• 1985

• KIPE Magazine
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• v.4 no.6
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• pp.15-22
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• 1999

• 한국도로학회지:도로
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• v.13 no.3
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• pp.49-51
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• 2011

• ICROS
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• v.4 no.3
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• pp.7-9
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• 1998

• Proceedings of the Korea Water Resources Association Conference
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• 2009.05a
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• pp.1908-1912
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• 2009

유량자료는 물의 순환과정을 규명하고 효율적인 수자원 개발 및 이수 치수 계획 등에 매우 귀중하게 이용된다. 그러나 이러한 유량자료를 확보하는 데는 많은 시간과 경비 등이 요구되기 때문에 주요 수위의 유량측정자료로 수위-유량관계 곡선식(Stage-Discharge Curve)을 개발하여 유량자료를 환산하고 있다. 따라서 수위-유량관계 곡선식의 신뢰도는 유량자료의 품질에 절대적인 영향을 미치는 요인으로 작용된다. 수문학을 연구하는 많은 학자들은 고품질의 유량자료를 생산하여 신뢰성 있는 곡선식을 개발하고자 유량측정 방법과 기준, 장비개량 등에 관한 연구를 수행하고 있다. 측정하고자 하는 기기별 측정 성과에 대한 연구 자료가 거의 없이 국내에 보급된 다양한 유속측정기기를 사용하여 유량자료를 생산하여 활용하고 있다. 본 연구에서는 규격화된 콘크리트 수로에 일정한 유량을 흘려보내고 다양한 측정기기를 이용하여 유속을 측정하였다. 그리고 이 측정성과를 이용하여 유량을 산정하고 비교분석하였다. 실험을 위해서 국내에서 일반적으로 사용되고 있는 측정기기로 마그네틱유속계(Electromagnetic Current Meter), 휴대용유량계(Flow Meter), 프라이스유속계(USGS Type AA Current Meter), 갈수기용유속계(USGS Pygmy Meter)등의 장비를 사용하였으며, 동일한 조건에서 유량을 얻음으로 측정 기기가 제시하는 유량을 알 수 있었다. 비교검토에 적용하고자 측정한 수심으로는 0.25m, 0.30m, 0.35m, 0.40m의 4개 Case로 진행이 되었으며, 측정방법으로는 도섭법(Wading Measurement)에 의하거나 케이블웨이(Cableway), 교량법(Bridge Measurement), 보트법(Boat Measurement)등이 있으나, 신뢰성과 정확도를 높이기 위해 도섭법으로 수면에서 0.6d 지점의 유량측정방법(1점법)을 적용하였다. USGS Type AA Current Meter, USGS Pygmy Meter는 유속측정기기의 검교정을 받았으므로 다른 실험유속측정치의 비교를 위한 기준값으로 사용하였다. 따라서 국내에서 널리 사용되는 측정기기(Electromagnetic Current meter, Flow Meter, USGS Type AA Current Meter, USGS Pygmy Meter)별 검토 결과 프라이스유속계를 기준으로 마그네틱유속계는 ${\pm}$10% 이상, 갈수기용 유속계 및 휴대용 유량계는 ${\pm}$5% 미만의 차이가 있음을 확인할 수 있었다.

• Journal of The Korean Association For Science Education
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• v.22 no.3
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• pp.455-465
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• 2002

This study investigates students' preconceptions about measurement theory; repeating measurements. how to handle repeat measurements, measurement errors, and uncertainty. Thirty students in seventh grade participated in this study. Students' conceptions were elicited using observation and interview notes. Half of the students measured only two times. and none of them more than five times. After repeating measurements, seventy seven percent of them selected result according to their feelings, while only thirteen percent of them calculated the mean. Sixty percent of them regarded the main cause of measurement errors as their mistakes, not as the problems of environment or measuring instrument. Most students thought the main reason of various results by different persons or time period as human. Forty percent of them denied the uncertainty of measurement, while thirty three agreed, and most students thought the reason of uncertainty was due to human imperfection. This study showed more than half of the students did not know how to handle repeat measurements, and they regarded the cause of measurement errors as their mistakes. In addition, they thought the main reason of various measuring results and uncertainty as human.

• Journal of the Korean Vacuum Society
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• v.16 no.1
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• pp.52-57
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• 2007

The interaction force between biomolecules(DNA-DNA, antigen-antibody, ligand-receptor, protein-protein) defines not only biomolecular function, but also their mechanical properties and hence bio-sensor. Atomic force microscopy(AFM) is nowadays frequently applied to determine interaction forces between biological molecules and biomolecular force measurements, obtained for example using AFM can provide valuable molecular-level information on the interactions between biomolecules. A proper modification of an AFM tip and/or a substrate with biomolecules permits the direct measurement of intermolecular interactions, such as DNA-DNA, protein-protein, and ligand-receptor, etc. and a microcantilever-based sensor appeared as a promising approach for ultra sensitive detection of biomolecular interactions.

• Journal of the Korean Society for Nondestructive Testing
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• v.21 no.2
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• pp.169-176
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• 2001

In modern industry, the accuracy and the sulfate-finish requirements for machined parts have been becoming ever more stringent. In addition, the measurement and understanding of surface topography is rapidly attracting the attention of the physicist and chemist as well as the engineer. Optical measuring method is used in vibration measurement, crack and defect detection with the advent of opto-mechatronics, and it is expected to play an important role in surface topography. In this study, the principle of confocal microscope is described, and the advanced 3-D surface measuring system that has better performance than the traditional confocal microscope is developed. Suitable fixtures arc developed and integrated with the computer system for generating 3-D surface and form data. Software for data acquisition and analysis of various parameters in surface geometrical features has been developed.

• KSBB Journal
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• v.21 no.1 s.96
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• pp.49-53
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• 2006

The aim of this research is to estimate the values of biological kinetic parameters of pharmaceutical wastewater for understanding biochemical properties. Maximum specific growth rate (${\mu}m$), yield coefficient (Y), and half-velocity coefficient (KS) were determined using oxygen uptake rate (OUR), and the results were 10.49/day (0.437/hr), 0.655, and 38.89 mg/L, respectively. Measured ${\mu}max$ by nonlinear regression of Monod equation was 10.63/day (or 0.443/hr), and this value was similar with above result. These parameters may be used to increase efficiency of pharmaceutical wastewater treatment and to determine amount of oxygen needed to removal BOD and dissolved oxygen in activated sludge process.