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Babinet의 원리와 Generalized Sheet Transition Conditions(GSTCs)를 이용한 메타스크린 해석
이선규(Sun-Gyu Lee),이정해(Jeong-Hae Lee) 한국전자파학회 2018 한국전자파학회논문지 Vol.29 No.9
Babinet의 원리와 generalized sheet transition conditions(GSTCs)를 이용한 메타스크린 해석 방법을 제안하였다. 먼저, Babinet의 원리로부터 동일한 치수를 갖는 메타필름과 메타스크린의 상보스크린 관계를 확인하였다. 이러한 특성은 메타필름의 가장 기본구조인 패치표면의 반사계수와 메타스크린의 가장 기본구조인 메쉬표면의 투과계수 결과로부터 검증하였다. 또한, GSTCs에 의해 계산된 패치표면의 반사계수와 메쉬표면의 투과계수의 관계에도 동일하게 적용됨을 확인하였다. 이를 통해 분극률 밀도(polarizability density)를 이용한 메타필름 설계가 메타스크린 설계에 이용될 수 있음을 보였다. 제안된 방법은 전자기파의 크기, 위상, 편파 등의 제어가 요구되는 다양한 메타표면 단위 구조 분석에 적용 가능할 것으로 예상된다. Using Babinet"s principle and generalized sheet transition conditions(GSTCs), an analysis method for metascreens is proposed. First, the relation of a complementary screen between a metafilm and metascreen with the same dimensions was confirmed using Babinet"s principle. These properties were verified by comparing the reflection coefficient of the patch and the transmission coefficient of the mesh. The patch and mesh are the basic structures of metafilms and metascreens, respectively. Based on these findings, it is also confirmed that the reflection coefficient of the patch surface calculated by GSTCs has the same value as the transmission coefficient of the mesh surface. It is expected that the proposed analysis methods can be applied to the magnitude, phase, and polarization of electromagnetic waves in the various unit structures of a given metasurface.
재활용 수지를 이용한 이중바닥방식의 조립형 녹화 시스템에 관한 실험적 연구
이선규(Lee Sun-Gyu),최성민(Choi Sung-Min),오상근(Oh Sang-Keun) 대한건축학회 2008 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.28 No.1(구조계)
The purpose of this study was to make up for the weak points of existing waterproofing for green roof. Therefore, we make an estimate of a applicable possibility through the performance valuation for green roof on the building. In test methods, we progressed performance tests about six item on the KS. of the data. The results of this study were as follows; the performance was agreemented Korea standard. Consequently, Double layer green-roof system of assembly-type with recycled films is able to solving problem that the existing green roof complicated to Maintenance.
통계적 기법을 활용한 복합열화환경 시험의 정량화 방안에 관한 연구
이선규(Lee Sun-Gyu),최성민(Choi Sung-Min),오상근(Oh Sang-Keun) 대한건축학회 2009 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.29 No.1(구조계)
The quality of the material is managed to quantifying the performance requirement of waterproofing materials on Korea standard. But the waterproofing material frequent occurred to don't display performances Even though one passes Korea standard, because it has various variables to occur waterproofing defections by the environment of construction in the field. Therefore, this study is intended as a proposal of quantitative plan to have size of influence on the waterproofing material using the univariate ANOVA of the statistical procedure through the performance test to have mixxing the deterioration factors(temperature, sulphuric acid, and sodium chloride). Test a result, the waterproofing film which are exposed to be particular combined deterioration environments is confirmed what it lose a function to get damaged, and the peeling resistance data make a comparison to relative size of materials by deterioration factors.
진동구조물 슬래브 보호층으로서 라텍스 콘크리트의 수밀특성 분석
이선규 ( Sun Gyu Lee ),이정훈 ( Jung Hoon Lee ),최성민 ( Sung Min Choi ),오상근 ( Sang Keun Oh ) 한국건축시공학회 2009 한국건축시공학회 학술발표대회 논문집 Vol.9 No.1
The LMC method of construction which have application to the road bridge is being considered the least relative importance about the watertight performance, because it focused on the durability of concrete. However, The LMC which is being expanded scope of application to the method of construction has grown importance about the watertight performance on the usability and maintenance side as well as durability. In this study, The latex concrete of two types which are different from mingled-ratio of the latex made a comparison to the compressive strength, watertight performance, dynamic wheel load resistance performance and confirmed what it has resistibility about chemical action through the chemical resistance test. The initial strength and watertight performance showed that were tendency the downward at 14 days. However, The long-term strength after 28 days showed that it has firm performance. In consequence, The initial curing of latex concrete is required to scrupulous care and attention at the site application. As a chemical resistance test result, The specimen that is steeped in sulphuric acid solution of 2% discovered the delamination phenomenon. However, it was confirmed that delamination phenomenon don``t have an effect on the compressive strength. Moreover, As a dynamic wheel load resistance test result, The latex concrete was concluded to confirming the durability and running stability, because it had hardly any thickness reduction of latex concrete surface about dynamic wheel load and rarely found crack and delamination.