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고온에 노출된 비정질 강섬유 보강 고강도 콘크리트의 역학적 특성
최경철,김규용,김홍섭,황의철,남정수 한국콘크리트학회 2020 콘크리트학회논문집 Vol.32 No.1
In this paper, stress-strain, compressive strength, elastic modulus and thermal expansion strain of amorphous steel fiber reinforced high strength concrete exposed to high temperatures of 100, 200, 300, 500 and 700 °C were investigated. The concrete used compressive strength 100 and 120 MPa high strength concrete, 0.0, 0.3 and 0.5 vol% amorphous steel fiber were mixed. As a result, the specimens containing amorphous steel fibers showed small peak strain and thermal expansion strain, and compressive strength and modulus of elasticity were measured relatively higher than 300 °C. Therefore, the cracks of concrete caused by the expansion of the aggregate and the shrinkage of the cement paste are controlled by the thermal expansion strain and the maximum strain due to the incorporation of the amorphous steel fiber, so that the strength and stiffness degradation phenomenon of the high-strength concrete could be improved.
압축강도 및 가열속도에 따른 콘크리트의 내부수증기압 평가
최경철,김규용,민충식,이태규,남정수 한국구조물진단유지관리학회 2011 한국구조물진단학회 학술발표회논문집 Vol.2011 No.9
When fire occurs, Constucture is dameged. Because concrete under high temperature can occur spalling. According to previous studies, Spalling is related with vapor pressure of concrete. Vapor pressure has different behavior with concrete compressive strength and Heating rate. In this study, Spalling and Vapor pressure were evaluated with compressive strength and Heating rate. Concrete compressive strength are 27, 40, 60, 80, 100㎫ and Heat by ISO-834 standard fire curve and 1℃/min. In the result, In case of ISO-834 Spalling occurs in All specimen except 27㎫. and In 1℃/min, All specimen didn't occur spalling except 100㎫. And water vapor pressure was increased With the increasing strength. But the specimen occurred spalling, water vapor pressure is low.
최경철,김승희 한국독성학회 2013 Toxicological Research Vol.29 No.4
Phytoestrogens exist in edible compounds commonly found in fruits or plants. For long times, phytoestrogens have been used for therapeutic treatments against human diseases, and they can be promising ingredients for future pharmacological industries. Kaempferol is a yellow compound found in grapes, broccoli and yellow fruits, which is one of flavonoid as phytoestrogens. Kaempferol has been suggested to have an antioxidant and anti-inflammatory effect. In past decades, many studies have been performed to examine anti-toxicological role(s) of kaempferol against human cancers. It has been shown that kaempferol may be involved in the regulations of cell cycle, metastasis, angiogenesis and apoptosis in various cancer cell types. Among them, there have been a few of the studies to examine a relationship between kaempferol and apoptosis. Thus, in this review, we highlight the effect(s) of kaempferol on the regulation of apoptosis in diverse cancer cell models. This could be a forecast in regard to use of kaempferol as promising treatment against human diseases.
최경철,안성일,김승훈,장철,김국주,양기열 에스케이텔레콤 (주) 2008 Telecommunications Review Vol.18 No.6
현재 디스플레이 산업의 중심은 평판 디스플레이에서 플렉시블 디스플레이로 넘어가고 있다. 본 논문에서는 플렉시블 디스플레이의 중심이 되는 기술들의 이해를 돕기 위해 플렉시블 액정 디스플레이, 플렉시블 유기발광 다이오드, 플렉시블 플라즈마 디스플레이 그리고 전자종이의 순으로 소개하고, 각 방식을 채택하여 실제 제품을 발표한 현황들을 알아보도록 한다.