• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.30 no.6
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• pp.84-91
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• 2002

Temperature distribution in the GTD111 turbine blade used in power plaints is calculated by heat transfer analysis. Linear stress analysis of the turbine blade is also carried out under thermal loads and centrifugal forces. The numerical results of steady state heat transfer analysis slow that high temperature distribution occurs at the leading edge and tip section of the blade. The thermal stress result indicates that the equivalent stress at the tip of the pressure surface is higher than other sections of the blade. Maximum centrifugal stresses without the thermal effect occurs at the front of the fir tree. From the thermal-centrifugal stress analysis, maximum equivalent stress occurs at the fir tree. Stresses applied by the thermal loads and centrifugal forces are less than the yield stress. The GTD111 turbine blade is safe to be used in the power plants.

• Applied Chemistry for Engineering
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• v.34 no.1
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• pp.23-29
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• 2023

Microfluidic reactors have been made to achieve significant development for the generation of new functional materials to apply in a variety of fields. Over the last decade, microfluidic reactors have attracted attention as a user-friendly approach that is enabled to control physicochemical parameters such as size, shape, composition, and surface property. Here, we develop a centrifugal microfluidic reactor that can control the flow of fluid based on centrifugal force and generate multifunctional particles of various sizes and compositions. A centrifugal microfluidic reactor is fabricated by combining microneedles, micro- centrifuge tubes, and conical tubes, which are easily obtained in the laboratory. Depending on the experimental control param- eters, including centrifuge rotation speed, alginate concentration, calcium ion concentration, and distance from the needle to the calcium aqueous solution, this strategy not only enables the generation of size-controlled microparticles in a simple and reproducible manner but also achieves scalable production without the use of complicated skills or advanced equipment. Therefore, we believe that this simple strategy could serve as an on-demand platform for a wide range of industrial and academic applications, particularly for the development of advanced smart materials with new functionalities in biomedical engineering.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.9 no.2
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• pp.107-114
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• 1989

Model pile pull-out tests have been executed to investigate the characteristics of the critical relative displacement at which the critical pile skin resistance is mobilized. Test result shows that the critical relative displacement is neither constant nor pile size dependent, but it is the most closely related with the magnitude of the critical skin resistance. The empirical relationship between the two quantities has been established. Behavior of centrifuge physical models of skin-resistance-related problems has been investigated on a quantitative basis by a computational method. A pile downdrag problem has been employed as an example of the skin-resistance-related problems. A simple transfer function type method has been developed for the analysis of the downdrag. It is concluded from the analysis that centrifuge physical modeling of skin-resistance-related problems may lead to an erroneous result on an unconservative side, as may have been expected due to the violation of the similarity rule by the quantity of the critical relative displacement.

• Proceedings of the KGS Conference
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• 2003.05a
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• pp.141-147
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• 2003

경지 개간 과정은 일차적으로 해당 지역의 자연지리적 특색을 반영하고 당대의 자연 환경 극복 기술, 인접 지역과의 교통망과 접근성, 토지 이용에 영향을 주는 경제적, 제도적 여건 변화, 국가 중심지와의 사회ㆍ정치적 구심력 및 원심력 등과의 관련 속에서 전개되므로 형태적 범주 내지 가시적 영역을 넘어서 고찰되어야 할 필요가 있다. (중략)

• Magazine of the Korea Concrete Institute
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• v.6 no.6
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• pp.35-41
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• 1994

• Geotechnical Engineering
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• v.21 no.9
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• pp.15-20
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• 2005

• 수도
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• v.24 no.5 s.86
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• pp.87-101
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• 1997

• 지반과기술
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• v.4 no.3
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• pp.61-77
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• 2007

• Journal of Technologic Dentistry
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• v.4 no.1
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• pp.9-12
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• 1982

• Journal of the Korea Furniture Society
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• v.10 no.2
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• pp.63-71
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• 1999

본 연구는 목재중의 수분량이 변화하는 비정상태하에 있어서의 액체투과성을 평가하기 위한 새로운 방법으로써 원심법에 의한 액체투과성을 평가하기 위한 새로운 방법으로써 원심법에 의한 액체투과성의 평가법을 확립해 보고자 실시하였다. 이 방법은 원심력장에 있어서의 액체투과성과 원심처리부로부터 액체투과성을 평가하는 것이다. 실험결과, 삼나무(Cryptomeria japonica)와 미송 (Pseudotsuga menziesii)은 서로 다른 탈수경과를 나타내었다. 삼나무는 미송보다 더 많은 탈수량을 보였고 재내의 태수량의 변이가 심하였다. 한편 변재와 심재의 탈수거동에 있어서 삼나무는 기체투과성에 의해 평가된 값과 상반된 결과를 나타내었다. 즉, 2200∼3300rpm의 범위에서 편재는 심재보다 탈수량이 적었다.