• 한국항공우주학회지
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• 제31권10호
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• pp.66-72
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• 2003

우주발사체의 2단용 엔진으로 10톤급 케로신 액체로켓엔진에 대한 냉각 기구로서, 재생냉각과 막냉각을 고려한 냉각특성에 대한 해석전 연구를 수행하였다. 연소기 내에서 연소 가스의 유동이 축방향으로 층류화되어 있다는 개념하에, 엔진 단면을 서로 독립적인 중심부와 외곽부로 나누며, 외곽부에는 여분의 연료를 분무시킴으로써 연소가스 온도를 낮추어 냉각채널로 전달되는 열유속량과 벽면 온도를 감소시킬 수 있었으며, 엔진의 열적 안정성을 향상시킬 수 있었다.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2003년도 제21회 추계학술대회 논문집
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• pp.78-82
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• 2003

우주발사체의 2단용 엔진으로 10톤급 케로신 재생 냉각 방식의 액체로켓엔진에 대한 보조 냉각 기구로서, 막냉각을 고려한 냉각특성에 대한 해석적 연구를 수행하였다. 연소기내에서 연소가스의 유동이 축방향으로 층류화되어 있다는 개념하에, 엔진 단면을 서로 독립적인 중심부와 외곽부로 나누며, 외곽부에는 여분의 연료를 분무시킴으로써 연소가스 온도를 낮추어 냉각채널로 전달되는 열유속량과 벽면 온도를 감소시킬 수 있었으며, 엔진의 열적 안정성을 향상시킬 수 있었다.

• 한국실내디자인학회:학술대회논문집
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• 한국실내디자인학회 2005년도 춘계학술발표대회 논문집
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• pp.257-258
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• 2005

The university building which is located in Daehak-ro where the commercial buildings are. The color of the building exterior and the signs are various to distinguish. To recognize the building exterior among the surrounding areas, it needs visual and bright color on it. The blue and white selected from the color of university identity. The core of the building is treated as a tower In vertically and white color is painted. And the rest parts of the building are treated horizontally and blue color is painted. The color of the building exterior shows the visual effects not only symbolism but attention.

• Steel and Composite Structures
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• 제28권1호
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• pp.83-98
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• 2018

This research was conducted to study the behavior of exterior concrete beam-column joints with reinforced shape memory alloy (SMA) bars tested under cyclic loading. These bars benefit from superelastic behavior and can stand high loads without residual strains. The experimental part of the study, 8 specimens of exterior concrete beam-column joints were made and tested. Two different types of concrete with 30 and 45 MPa were used. Four specimens contained SMA bars and 4 specimens contained steel bars in beam-column joints. Furthermore, different transverse reinforcements were used in beams investigate the effects of concrete confinement. Specimens were tested under cyclic loading. Results show that SMA bars are capable of recentering to their original shape after standing large displacements. Due to the superelastic behavior of SMA bars, cracks at the joint core vanish under cyclic loading. As the cyclic loading increased, bending failure occurred in the beam outside the joint core. In the analytical parts of the study, specimens were simulated using the SeismoStruct software. Experimental and analytical results showed a satisfactory correlation. Plastic hinge length at the beam joint for specimens with SMA and steel bars was calculated by empirical equations, experimental and analytical results. It was shown that Paulay's and Priestley's equations are appropriate for concrete beam-column joints in both types of bars.