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황성철,양일승 대한건축학회지회연합회 2006 대한건축학회연합논문집 Vol.8 No.4
Composite girder is connected using stud connector between the concrete slab and the steel girder. Because of composite effect, the load carrying capacities in positive bending moment and rigidity of composite girder is bigger than those of the steel girder. However, because neutral-axis risen, curvature of the composite girder is smaller than that of the steel girder. This paper analyzed the relation of composite effect and neutral-axis by variation of the steel girders. The conclusions derived from this study are as follows. 1) The load carrying capacities of composite girder in positive bending moment rise from 20% to 80% than those of the steel girder. However, cases that area of the steel girder is over 200m2 can not expected composite effect. 2) When composite effect is over 1.4 times of steel girder, neutral-axis rise to the upper flange. 3) Also, in cases that area of the steel girder is over 200m2, curvature of steel girder is less than that of the steel girder.
실내 공간의 빛 환경 조절에 관한 연구 : 컴퓨터 프로그램을 利用한 窓面글레어 豫測
황성철,김강수 대한건축학회 2002 대한건축학회논문집 Vol.18 No.5
To design the space with windows, the views and the natural light are generally considered. But, it is difficult to design with the daylight, because it is unpredictable. Also, especially the glare from windows results in its difficulty in the space design with windows. The purpose of this study was to evaluate and predict the discomfort glare from a window in the CIE standard overcast sky. For this research, a computer software program was developed to simulate DGI and UGR glare evaluations, and results provided by these glare evaluation system were analyzed for a variety of window conditions such as window-wall ratios, observer's positions, and window shapes. To verify the computer program, Superlite 2.1 and Radiance were used in this study. The results show that the keys to control window glare are as follows ; in a room shape, a small size cell-type room rather than a wide open-plan one is desirable; in wall-window ratio, below 60% window ratio is appropriate.
Embedded Boundary Method를 이용한 불규칙한 지형에서의 감쇠 파동장 기반 초동주시 계산
황성철,이강훈,편석준 한국지구물리.물리탐사학회 2019 지구물리와 물리탐사 Vol.22 No.1
The first-arrival traveltime calculation method based on the damped wave equation overcomes the shortcomings of ray-tracing methods. Since this algorithm needs to solve the damped wave equation, numerical modeling is essential. However, it is not desirable to use the finite-difference method (FDM), which has good computational efficiency, for simulating the land seismic data because of irregular topography. Thus, the finite-element method (FEM) which requires higher computational cost than FDM has been used to correctly describe the irregular topography. In this study, we computed first-arrival traveltimes in an irregular topographic model using FDM incorporating embedded boundary method (EBM) to overcome this problem. To verify the accuracy and efficiency of the proposed algorithm, we compared our results with those of FEM. As a result, the proposed method using EBM not only provided the same accuracy as the FEM but also showed the improved computational efficiency. 감쇠 파동장 기반 초동주시 계산은 기존 파선추적법의 단점을 보완하는 초동주시 계산기법이다. 이 기법은 주파수 영역 감쇠 파동장을 구해야 하기 때문에 수치 모델링이 필수적이다. 하지만 육상 탄성파 탐사 자료를 모사할 경우 불규칙한 지형을 고려해야 하기 때문에 계산 효율이 좋은 유한 차분법을 적용하기 어렵다. 불규칙한 지형을 정확하게 모사하기 위해 유한 요소법을 사용할 경우 계산량이 크게 증가한다는 단점이 있다. 이 논문에서는 이러한 문제점을 극복하기위하여 embedded boundary method (EBM)를 유한 차분법에 적용하여 불규칙한 지형에서 초동주시를 계산하였다. 제안한 초동주시 계산기법의 정확도와 효율성을 확인하기 위하여 유한 요소법과 비교하였다. 수치 실험 결과 EBM을 적용한초동주시 계산기법이 유한 요소법을 이용한 방법과 대등한 정확성을 보였고, 계산 효율은 더 향상되는 것을 확인할 수있었다.