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비내시경적 누낭비강문합술에서 비강내공의 모양에 따른 수술 성공률
권영아,김호창,하명숙,김성주,장재우,Young A Kwon,MD,Ho Chang Kim,MD,Myung Sook Ha,MD,Sung Joo Kim,MD,PhD,Jae Woo Jang,MD,PhD 대한안과학회 2009 대한안과학회지 Vol.50 No.1
Purpose: To evaluate the success rates according to the shape of rhinostomy after endonasal dacryocystorhinostomy. Methods: We analyzed 131 patients (188 cases) who had undergone endonasal dacryocystorhinostomy with a minimum follow-up of 6 months. After surgery, all cases were classified into flat, alcove, concave, or concealed concave types according to Jane’s rhinostomy classification. Patency to irrigation and improved symptoms were considered indicative of a successful outcome. Results: There were 81 flat type patients (125 cases), 31 alcove type patients (42 cases), 19 concave type patients (21 cases), and no cases were classified as concealed concave type. The success rates were 75.2%, 85.7%, 81.0% respectively, and the most common cause of failure was the formation of granulation within the ostium. The success rates did not significantly vary according to the shape of rhinostomy (p=0.144). Conclusions: The success rates after endonasal dacryocystorhinostomy of flat, alcove, and concave types in turn were 75.2%, 85.7%, and 81.0%.
음이온 멀티체인형 계면활성제의 메탄 가스 하이드레이트 형성시 효과
권영아(Kwon, Young-Ah),정광은(Jeong, Kwang-Eun),박종목(Park, Jong-Mok),김철웅(Kim, Chul-Ung),채호정(Chae, Ho-Jeong),정순용(Jeong, Soon-Yong),임진형(Yim, Jin-Heong),이주동(Lee, Ju-Dong) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.06
본 연구에서는 고밀도, 고촉진 가스하이드레이트 생성 촉진제 (promoter)의 개발을 위하여 음이온성 멀티체인형 게면활성제를 제조하였다. 또한 각 계면활성제의 알킬그룹의 길이에 따라 같은 조건에서의 계면활성제의 촉진 효과를 비교하였다. 1?C에서 35bar,40bar로 압력을 달리하여 비교 실험하여 메탄 하이드레이트 생성속도를 측정하고, 각 조건에서의 계면활성제의 촉진 효과를 비교하였다. 알킬그룹의 길이가 짧을수록, 압력이 높을수록 촉진 속도가 빠르다. 또한 기존의 상용화된 SDS(Sodium dodecyl sulfate)보다 본 연구에서 제조한 C10의 음이온성 멀티체인형 계면활성제가 SDS 대비하여 소량으로도 충분한 효과를 나타냄을 확인하였다.
권영아(Young-Ah Kwon),김지연(Jiyoun Kim),이승호(Seungho Lee) 대한지리학회 2005 대한지리학회지 Vol.40 No.3
본 연구에서는 우리나라 19개 지점의 일평균기온을 분석하여 꽃샘추위 발생 일수의 분포와 변화 경향을 파악하고자 하였다. 꽃샘추위 발생일은 일평균기온과 일평균기온 평년값(1971~2000)의 편차를 계산하여 일평균기온이 평년값보다 낮은 상위 10%에 해당하거나 당일과 2일전과의 평균기온 차에서 당일의 평균기온이 낮은 상위 10%에 해당하는 날로 정의하였다. 꽃샘추위 발생일은 서해안이 동해안보다 많고, 위도가 높아질수록 많다. 꽃샘추위 발생일의 순별 분포 유형은 기압계 및 지형과 밀접한 관련이 있어 동해안과 서해안 지역, 도서 지역으로 구별된다. 꽃샘추위의 발생 일수는 한반도가 시베리아 고기압의 영향을 받는 빈도 및 강도와 관련이 있으며 최근 대부분 지역에서 감소하는 경향이다. 그러나 울릉도와 동해안 지역에서는 꽃샘추위 발생 일수 변화가 거의 없어 꽃샘추위 발생 원인이 다르다. This paper was examined distribution and changing trends on occurrence days of Spring Colds(cold surge in the flowering season) from the end of February to early in April during 1973-2004. We defined an occurrence day of Spring Colds as above 10% of the anomalies of mean daily temperature or above 10% of the difference of the daily mean temperature between the day before two days. In the west coastal region, the occurrence days of Spring Colds is higher in the end of February and less frequent in the early in April. In the east coastal region, the occurrence days of Spring Colds is higher in the early in April. Spring Colds is closely related with frequencies and a intensities of Siberian High. The occurrence days of Spring Colds has decreased in the most area except Ulleung island and the east coastal region.
토지이용 유형에 따른 기온 특성 -서울시 자동기상관측지점 주변을 사례로-
권영아 ( Kwon Yeong A ),이현영 ( Lee Hyeon Yeong ) 한국환경영향평가학회 2003 환경영향평가 Vol.12 No.4
The influence of land-use type on surrounding temperature was studied the relationships between land-use types and the air condition analyzing AWS (Automatic Weather Station) data of Seoul from KMA (Korea Meteorological Administration). The distribution of air temperature by land-use type has been influenced by the different heating and cooling rates. The difference of heating rates depending on the land-use type was largest at 2-3hours after sunrise and the difference of cooling rates was largest from 2hours before sunset to 2hours after sunset with its maximum at sunset. The difference of cooling rates is greatest in a clear and calm weather situation and the large difference in cooling rates between the green areas and built-up area is up to 1.5℃/h. By season, the difference of cooling rates is largest in fall and in turn spring, winter and summer. In a cloudy or rainy day, the difference in heating and cooling rates on land-use type is not distinct but the tendency is similar to a clear day. In all seasons, the rate of difference occurrence of the daily range of temperature between the green areas and built-up area was large, especially fall. In a fall with a clear and calm day, the magnitude of the daily range of temperature between the green areas and built-up area was largest.