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도시열섬 완화를 위한 나무심기운동에 따른 지표면 온도 변화 분석 - 구미시를 사례로 -
김경훈,김형수,권용하,박인선,정윤재,KIM, Kyunghun,KIM, Hung Soo,KWON, Yong-Ha,PARK, Insun,CHOUNG, Yun-Jae 한국지리정보학회 2022 한국지리정보학회지 Vol.25 No.1
Due to climate change, temperature is rising worldwide. Since rapid growth has been achieved focused on cities, South Korea is experiencing serious environmental problems such as heat island and air pollution in urban areas. To solve this problem, the central and each local government are actively promoting tree planting campaigns. This study quantitatively calculated changes in green areas and vegetation of Gumi by the tree planting campaign, and analyzed the temperature changes accordingly. For the target area, the green area, vegetation index, and ground temperature were calculated for 4 different time periods using the given Landsat satellite images. As a result of the study, the green area of was increased by 7.24km<sup>2</sup> and 4.93km<sup>2</sup> for two regions, respectively. Accordingly, the vegetation index increased by 0.14 to 0.16, and the temperature decreased by 0.8 to 1.2℃. The Tree planting campaign not only plays a role in lowering the temperature of the city but also does various roles such as air purification, carbon absorption, and providing green rest areas to citizens. Therefore the campaign should be carried out continuously.
해외 재난 발생이 국내 경제에 미치는 파급효과 분석 : 중국 사례를 중심으로
김경훈(Kim,Kyunghun),정재원(Jung,Jaewon),배영혜(Bae,Young Hye),이준형(Lee,Junhyeong),김형수(Kim,Hung So) 한국방재학회 2021 한국방재학회논문집 Vol.21 No.6
과거에는 자연재난으로 인한 피해가 해당 국가에만 국한되어있었지만;세계가 경제적으로 하나의 공동체가 되어가면서 다른 국가에도 영향을 주는 사례들이 증가하고 있다. 이러한 사례들이 증가하고 있지만 해외재난의 파급효과에 대한 연구는 부족한 상황이다. 이에 본 연구에서는 해외 재난 발생 시에 국내 경제 발생할 수 있는 파급효과에 대해서 분석하였다. 중국 사례를 기반으로 해외재난시나리오를 만들었으며;투입계수를 통해 국내에 발생할 수 있는 파급효과를 정량적으로 산정하였다. 해외재난시나리오를 통해서 파급효과를 산정한 결과;직접피해의 경우에는 GDP의 0.08% 수준이었으며 간접피해까지 추가한 총 피해액은 0.39%로 나타났다. 이를 통해서 해외 재난이 국내 경제에 큰 피해를 발생시킬 수 있다는 것을 확인할 수 있었다. In the past;damage from natural disasters was limited to the country directly affected;but as the world becomes one economic community;instances of damage spreading to other countries are increasing. Nonetheless;there has been insufficient research on the ripple effect of foreign disaster. This study thus analyzed the ripple effect on the domestic economy from foreign disaster;using a disaster scenario based on cases of China. The ripple effect was quantitatively calculated using an industry input coefficient. The results show that the direct damage was 0.08% of Gross Domestic Product (GDP);and the total amount of damage (including indirect damage) was 0.39% of GDP;thus demonstrating that foreign disaster could cause great damage to the domestic economy.
전단박화 효과를 고려한 R2R 공정에서의 잉크전달 과정에 관한 FSI 해석
김경훈(Kyunghun Kim),남태원(Taewon Nam),김소희(Sohee Kim),나양(Yang Na) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
In most of the earlier numerical studies for the practical R2R printing system, the conductive ink was used to be idealized by a Newtonian fluid. Considering the fact that the real conductive ink can be better described by a non-Newtonian fluid with a shear thinning effect, FSI analysis was conducted to investigate the effect of variable viscosity using a CFD technique for the R2R printing process. Numerical results showed that non-Newtonian model representing a shear thinning effect tend to produce relatively lower printing quality than that of the Newtonian model in terms of amount of transferred ink. Also, it was found that non-negligible web deflection occurs in all the geometries considered in the present work but the ratio of the web deflection gets smaller as the web handling speed becomes higher, indicating that the problems associated with the higher web handling speed may be more alleviated in the range of tens of microns than in the range of a couple hundred microns.