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도시 주거공간 내 가로협곡의 기하학적 특성이 열쾌적성에 미치는 영향 - 의사결정나무 분석 방법으로 -
차수연(Cha, Su-Yeon),오규식(Oh, Kyu-Shik) 대한건축학회 2020 대한건축학회논문집 Vol.36 No.12
This study analyzed the impact of the geometry of Urban Street Canyons (USCs) on citizens’ thermal comfort in order to manage urban spaces in response to the deterioration of the urban thermal environment due to climate change. Aspect ratio, formed by the height of buildings and width of streets, and street orientation were selected as the geometric characteristics of USCs. PET at 1.5m height calculated by ENVI-met, the microclimate simulation software, was chosen to determine the parameter of thermal comfort. Using the decision tree analysis, USCs of the case study area were classified into 10 nodes according to the geometry and thermal perception of each USCs. In addition, PET by each node derived by segmentation was analyzed over time. As a result, thermal comfort was found to differ according to the shadow generation rate of the streets - the higher the shadow generation rate, the more comfortable the thermal environment. More specifically, first, the higher the aspect ratio is, the more thermal comfort is found. Second, the more parallel the street orientation is and according to the direction of sunlight, the less thermal comfort is determined. Third, the impact of street orientation is indicated clearly when the aspect ratio is between 1.471 to 2.209. These results can be applied to establishing urban form, framed by building and street or for redeveloping street spaces in consideration to the thermal environment.
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다이캐스팅 공정으로 제조한 ADC12 알루미늄 합금의 물성 향상 및 진공 열처리 효과
조지훈,함다슬,오성찬,차수연,강현철,Jo, Jihoon,Ham, Daseul,Oh, Seongchan,Cha, Su Yeon,Kang, Hyon Chol 한국결정성장학회 2021 한국결정성장학회지 Vol.31 No.1
We report structural, mechanical, and thermal properties of diecast ADC12 aluminum alloys characterized using synchrotron X-ray diffraction (XRD), scanning electron microscopy, energy dispersive X-ray (EDX) analysis, thermal conductivity (λ), Vickers hardness (Hv), and stress-strain measurements. We also studied the effect of post-annealing performed in a vacuum atmosphere on the mechanical properties of diecast ADC12 alloys. EDX and XRD results revealed that Al2Cu and AlCu3 grains are formed, well dispersed in Al base and highly crystalline. Ultimate tensile strength (UTS) of 307.9 ± 9.1 MPa and elongation of 2.98 ± 0.62 % were estimated. λ was 129.3 ± 0.27 W/m·K and Hv was approximately 130. Both values were significantly higher than the reported values. At annealing temperatures ranging from 25 to 200℃, UTS and Hv values remained constant, while as the annealing temperature increased to 500℃, these values gradually decreased. This is because stabilization of the microstructure improves toughness and ductility. 최적의 조건에서ADC12 알루미늄 합금을 다이캐스팅 기법으로 제조하여 구조적, 기계적, 열적 성질을 연구하였다. 또한 진공에서 후속 열처리한 ADC12 알루미늄 합금의 기계적 물성 변화를 규명하였다. 방사광 X-선 회절 및 energy dispersive X-선 화학조성 분석법을 통하여 ADC12 합금은 알루미늄 기저에 알루미늄과 구리의 화합물인 Al2Cu 및 AlCu3 상이 결정질 형태로 분포하고 있음을 규명하였다. 대표적인 기계적 물성값인 인장강도와 연신율은 각각 307.9 ± 9.1 MPa와 2.98 ± 0.62 %이다. 기존 보고보다 우수한 열전도도(129.3 ± 0.27 W/m·K)와 비이커스 경도값(Hv = 130)을 나타낸다. 후속 열처리 결과, 200℃까지는 기계적 물성치가 일정하게 유지되었으나, 이후 500℃까지 열처리 온도를 증가시킬 경우에는 인장강도와 비이커스 경도가 점진적으로 감소하였다. 이는 열처리 도중 미세조직이 안정화되면서 인성과 연성이 향상되었기 때문이다.
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뉴스프레임 유형과 정부 신뢰도가 금연정책 지지도와 금연의도에 미치는 영향 미디어 옹호 접근
백혜진 ( Hye Jin Paek ),차수연 ( Su Yeon Cha ),남유진 ( Eu Jin Nam ),김도훈 ( Do Hun Kim ) 한국PR학회 2015 PR연구 Vol.19 No.1
This study takes a media advocacy perspective to understand what types of news frames more effective on tobacco high-tax policy and quitting intention. In addition, it examines the main and moderating effects of trust in government on the public’s support for the policy and quitting intention. Data were collected online among 434 adult smokers nationwide with three news frame conditions (human interest, economy consequences, health consequences). Results indicate that the study participants who read news about the cigarette price increase with an economy frame had a significantly lower level of support for the policy. In addition, trust in government also had a significantly positive main effect on public support in that those who have a higher level of trust in government tended to support the policy more. Some moderating effects of trust in government were found on both policy support and quitting intention if the policy were enacted.
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