• 한국약용작물학회:학술대회논문집
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• 2012.05a
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• pp.77-78
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• 2012

• Water for future
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• v.20 no.1
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• pp.63-72
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• 1987

This study describes a procedure of movable bed model tests and discusses the similitude with a view to state of the art. The prediction of littoral transport in the vicinity of coastal structure of nuclear power #9, 10 has been attempted. From the result of the present movable model study, it was found that the offshore breakwater is more excellent than the groyne and the rip-current barrier for the prevention against in take siltations and for the stability of investigated coastal structure of nuclear power plant.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2005.10a
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• pp.572-575
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• 2005

A microlens connected to microfluidic channel is fabricated. The microlens is sealed with an elastomeric membrane which deforms by pressure of fluid driven by a syringe pump resulting in the shape change of the microlens. The optical properties of the microlens could be controlled by changing the microlens shape. The microlens system were made of an elastomer, PDMS, using molding from a photoplastic master patterned by UV photolithography. The test results show the optical property of the lens could be made into convex and concave type by applying the fluidic pressure positive and negative.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2005.10a
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• pp.318-321
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• 2005

FIB (Focused ion Beam) milling on a 500-nm-thick silicon nitride membrane was studied in order to fabricate a high-resolution shadow mask, or called a nanostencil. The silicon nitride membrane was fabricated by MEMS processes of LPCVD, photolithography, ICP etching and bulk silicon etching. The apertures made by FIB milling and normal photolithography were compared. The square metal pattern deposited through FIB milled shadow mask showed 6 times smaller comer radius than the case of photolithography. The results show high resolution patterning could be achieved by local deposition through FIB milled shadow-mask.

• Education of Primary School Mathematics
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• v.4 no.1
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• pp.75-82
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• 2000

The purpose of this study is to investigate the recognition fur mathematics subject in the 5th and 6th graders elementary students. To carry out this study, the 5th and 6th graders recognition as learning mathematics subject was investigated by questionaire. The questionaire was analysed by using frequency and percentage. The 5th and 6th graders had difficulties in the hierarchical problem because mathematics is very systematic and hierarchical, and other had difficulties in studying mathematics because the explanation of the problem solving process in the textbook was not detailed. Others had difficulties in studying mathematics because of quick loaming progress, in applying the formulas and property of mathematics.

• Proceedings of The Korean Society of Agricultural and Forest Meteorology Conference
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• 2012.07a
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• pp.34-37
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• 2012

• Proceedings of The Korean Society of Agricultural and Forest Meteorology Conference
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• 2017.11a
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• pp.36-37
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• 2017

• Proceedings of The Korean Society of Agricultural and Forest Meteorology Conference
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• 2012.07a
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• pp.132-136
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• 2012

• Proceedings of The Korean Society of Agricultural and Forest Meteorology Conference
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• 2019.08a
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• pp.283-284
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• 2019

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.18 no.8
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• pp.38-43
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• 2019

Electrowetting on dielectric (EWOD) is a unique method of shape control of small-volume droplets in microfluidic biochips that relies on modification of surface wetting characteristics using electrical methods. In this study, the droplet shape control on various dielectric surfaces by the EWOD and the effect of droplets on the contact angle as well as the shape were investigated. The droplet used in the experiment was on a sample substrate with $5{\mu}l$ of de-ionized water (DIW) using a micropipette, and wettability was measured with a contact angle meter. This study is expected to be helpful for the development of various micro-total-analysis-systems (${\mu}TAS$) and microfluidic systems with MEMS technology.