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Landsat 8 위성자료를 이용한 도심녹지 냉각효과 분석
김근회,이영곤,김재환,최희욱,김백조 대한원격탐사학회 2018 大韓遠隔探査學會誌 Vol.34 No.2
Urban green areas or forest regions play an important role in lowering the air temperature of the surrounding areas. This cooling effect does not only affect inside of the green areas, but also extends into neighboring streets and buildings. In this study, the Land Surface Temperature (LST) are retrieved from the Landsat 8 satellite data for 8 clear days in Seoul, Korea from 2013 to 2015, and used for analyzing the cooling effect at an urban green region, Seonjeongneung, located in the southern part of Seoul. The LST distribution from the boundary of the Seonjeongneung presents that the cooling effect of the green areas was found to extend in many directions into the urban areas. The LST estimations of residential and commercial areas around the Seonjeongneung are also analyzed to assess how the green areas affect the type of land cover and the surroundings in the urban areas. Relatively lower LST for the residential areas from the Seonjeongneung boundary ranges from 100 to 250 m, resulting in an average cooling effect of 2.3°C. On the other hand, the LST distribution in the commercial areas shows that the effective distance of green areas are relatively low in the range of 0 to 200 m, which means the average cooling effect is approximately 0.3°C. This result shows that the cooling effect of the Seonjeongneung is clearly noticeable, particularly, the residential areas show greater cooling effect than commercial areas. 도심녹지는 도심 주변의 높은 기온을 낮춰 주는 중요한 역할을 한다. 도심녹지의 냉각효과는 녹지내부 뿐만 아니라 주변 도로와 빌딩 지역에도 영향을 준다. 도심녹지가 주변에 미치는 영향을 분석하기 위해2013년부터 2015년까지 관측된 Landsat 8 위성자료를 이용하여 서울 선정릉 주변의 지표면온도를 산출하였다. 선정릉 주변의 지표면온도 분포를 분석한 결과, 도심녹지의 냉각효과는 녹지를 중심으로 여러 방향에서 나타나는 것을 확인하였다. 도심녹지의 냉각효과에 미치는 토지피복의 영향을 살펴보기 위하여 주거지역과 상업지역에 대해 냉각효과를 분석한 결과 주거지역의 냉각효과 범위가 100∼250 m로 나타났고, 평균 2.3°C 의 냉각효과를 보였다. 반면, 상업지역의 냉각효과 범위는 0∼200 m 였고, 평균 약 0.3°C의 냉각효과를 보였다. 이러한 분석 결과를 통해 도심녹지의 냉각효과는 상업지역보다 주거지역에서 강도와 범위가 큼을 알수 있었다.
스테로이드와 칼슘통로 차단제가 단일 고선량 방사선 조사에 의한 백서 뇌세포자멸사에 미치는 영향
김근회,김세훈,김우재,정용구,임동준,조태형,서중근 대한신경외과학회 2003 Journal of Korean neurosurgical society Vol.33 No.2
Objective:Radiation injury includes radiation necrosis and apoptosis. The purpose of this study is whether steroids and calcium channel blockers are effective for the prevention of single high dose irradiation-induced apoptosis in the rat brain. Methods:Eighty Sprague-Dawley rats were divided into four experimental groups:Control(nontreated, n=20), Dexamethasone-treated(0.1mg/kg, n=20), Prednisolone-treated(2mg/kg, n=20), Nimodipine-treated (0.5mg/kg, n=20). After drug was administered, the right hemisphere of rat's brain was exposed to a single 10Gy dose of gamma rays using Ir-192. All brains underwent histological examination at 1 week, 2 weeks, 4 weeks, and 8 weeks after irradiation to evaluate cortical thickness and number of apoptotic cells. Apoptotic cells were detected by TUNEL assay. Results:In nimodipine-treated group, apoptotic cell count was reduced significantly, compared to that of control(non treated) group at 4 and 8 weeks after irradiation(p<0.05). The decrease of cortical thickness was reduced significantly in nimodipine-treated group, compared to that of control group(p<0.05). There was no significant changes in the number of apoptotic cells and cortical thickness in prednisolone and dexamethasone-treated groups compared with those of control. Conclusion:These results suggest that nimodipine treatment may have effects on the prevention of radiation-induced apoptosis. If it could be established that calcium channel blockers inhibit radiation injury, they might be useful in radiation therapy. Further investigation of calcium channel blockers including dosage effectiveness, intracellular calcium ion concentration and effects on tumor tissue are necessary to clarify the usefulness of nimodipine. Key words:Radiation;Apoptosis;Dexamethasone;Prednisolone;Nimodipine.
고해상도 수치모델을 이용한 제주국제공항 저층급변풍 예측
김근회,최희욱,석재혁,김연희 한국항공운항학회 2021 한국항공운항학회지 Vol.29 No.4
In aviation meteorology, the low level wind shear is defined as a sudden change of head wind below 1600 feet that can affect the departing and landing of the aircraft. Jeju International Airport is an area where low level wind shear is frequently occurred by Mt. Halla. Forecasting of such wind shear would be useful in providing early warnings to aircraft. In this study, we investigated the performance of statistical downscaling model, called Korea Meteorological Administration Post-processing (KMAP) with a 100m resolution in forecasting wind shear by the complex terrain. The wind shear forecasts was produced by calculating the wind differences between stations aligned with the runways. Two typical wind shear cases caused by complex terrain are validated by comparing to Low Level Wind Shear Alert System (LLWAS). This has been shown to have a good performance for describing air currents caused by terrain.