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이대성,홍유라 고신대학교의과대학 2007 고신대학교 의과대학 학술지 Vol.22 No.2
Background : The Outcome of Infants weighing less than 1,500 g(very low birth weight infants : VLBWI) reflect recent progress in neonatal intensive care. In this study, we evaluated mortality and morbidity of very low birth weight (VLBW) infants during the past eleven years. Methods : A retrospective review of medical record was analyzed for VLBWIs admitted to the neonatal intensive care unit of Kosin University Gospel hospital between January 1, 1996 and March 31 2007. Results : The incidence of VLBWI was 3.6%. Overall survival rate of VLBWI was 65.9%. The survival rate increased significantly over time(period Ⅰ: 49.4%, period Ⅱ : 82.4%, P<0.05). The survival rate increased as birth weight increased. The incidence of respiratory distress syndrome was 70.3%(102/171), bronchopulmonary dysplasia 32.1% (36/171), intraventricular hemorrhage 19.4%(33/171), sepsis 24.4%(41/171). The main causes of death were respiratory distress syndrome and sepsis. Conclusion : The survival rate of VLBWI during recent 11 years was 65.9%. Survival rate increased as birth weight and gestational age increased. More efforts are needed to improve the long term outcome by reducing common morbidities.
이대성,양인영,전용민,김춘택,양수석,Lee, Dae-Sung,Yang, In-Young,Jun, Yong-Min,Kim, Chun-Taek,Yang, Soo-Seok 대한기계학회 2002 大韓機械學會論文集B Vol.26 No.11
An Altitude Engine Test Facility(AETF) was built at the Korea Aerospace Research Institute in October 1999 and has been being operated for altitude testing of gas turbine engines of 3,000 Ibf class or less. The AETF has been calibrated using several engines such as J69 of Teledyne Co. as a facility checkout engine. Uncertainty analyses on the air flow rate and thrust were performed using the test results, according to ASME PTC 19.1-1998. Several modifications on the facility and test method were made in order to improve the measurement uncertainty to a satisfactory level over the whole operating envelop. Spatial distributions of pressure and temperature were measured, sensors were substituted by more accurate ones, inlet duct was modified to refine the flow quality, and pressure control logic was revised to remove the cell pressure fluctuation. As a result, the uncertainty of the air flow measurement was improved by 0.1% over all the test conditions, and the net thrust measurement by up to 3%. The improved measurement uncertainties of air flow and thrust are 0.68~O.73% and 0.4~1.3%, respectively.
이대성,나기창,김용준,Lee, Dai Sung,Na, Ki Chang,Kim, Yong Joon 대한자원환경지질학회 1985 자원환경지질 Vol.18 No.4
A petrological study has been done in the pyeongchang-Jaecheon area which is a northwestern part of the basement of Ogcheon zone for the purpose of comparison of the area to the Nogjeon-Yeongchun area which is the antipodal basement of the zone in the petrological and geotectonical view points. The major units of the area are Precambrian granitic gneissic complex, banded gneiss, linea ted leucocratic gneiss and pegmatitic leucogranitic gneiss in the west, elongated exposure of quartz schist (or partly quartzite) and phyllite, named as Jungdaegal-bong Group correlated to the lower sequence of Joseon Group, in the middle, and limestone and calcic dolomite, Iptanri Formation, correlated to the middle of Joseon Group in the east. Igneous plutons are distributed in the areas of gneissic complex and limestone formation as well as in the Eosangcheon and Daedaeri areas in the southeastern out of the area. Present study reveals that the gneissic complex are the products of granitization to metamorphism of amphibolite facies in the order of above mentioned from the metasediments of schists and calcareous rocks. A notable characteristics of the phyllite of Jungdaegal-bong Group is the presence of syntectonically segregated quartz rods in the forms of lens, swirl or boudinage in evenly distributed in the phyllitic to chloritic matrix. Igneous rocks range in composition from gabbro through diorite, granodiorite, to schistosed and porphyritic granites in stock and dike. The orogenic movement of the Ogcheon zone initiated in the middle Proterozoic time, pre-sedimentation of Ogcheon Group and superposed the granitization in Permian, Jurassic Daebo orogeny with granitic batholiths and stocks, and Cretaceous plutonic intrusion.
북한 급변사태 시나리오Ⅰ : 재스민혁명 국가들과 북한의 비교를 중심으로
이대성 한국융합보안학회 2017 융합보안 논문지 Vol.17 No.1
2011년 1월 튀니지에서 시작된 재스민혁명은 북아프리카와 중동지역 국가들에 많은 변화를 가져왔으며, 우리는 그 원 인을 살펴볼 필요가 있다. 우선, 이 지역의 왕정과 독재체제 국가들은 장기집권을 위하여 야당, 언론 등을 탄압하였고, 특 권계층에 집중된 권력은 부정부패를 양산하였다. 다음으로, 이 지역 국가들의 국가수입 대부분은 왕실과 독재자에게 귀속 되었고, 이를 배분하는 과정에서 문제가 발생하기 시작하였다. 특히, 1990년대 유가하락과 2000년대 생필품 가격 상승은 정부에 대한 불신을 초래하는 계기가 되었다. 마지막으로, 2 000년부터 2010년까지 이 지역 국가들의 인터넷 사용자가 평균 4,863% 증가하였고, 페이스북(Facebook), 트위터(Twitte r) 등과 같은 소셜 네트워크 서비스(SNS)의 증대도 국가차원의 정보 통제를 어렵게 한 요인이 되었다. 그렇다면, 과연 북한의 급변사태 가능성은 어떠한가에 대한 고민을 해야 한다고 본다. 이를 위해 재스민혁명이 발생 국가들과 북한의 정 치, 경제, 사회적 특성 등을 비교․분석할 필요가 있으며, 그 시사점을 도출하고자 한다. The Jasmine Revolution started from Tunisia in January 2011 has brought many changes into countries in North Africa and Middle East. We need to study the causes of the revolution. First, the kings and dictators in those countries oppressed the opposition parties and the media aiming for long-term seizure of power. The power concentrated on specific people produced illegalities and corruption. Secondly, most of the national income of those countries belonged to kings and dictators producing problems during the distribution of the income. Especially, with the decrease of oil price in 1990s and the increase of the price of daily necessities in 2000s people lost their credits on their governments. Lastly, the number of people in those countries using the Internet has increased by 4,863% from 2000 to 2010. The expansion of social network services such as Facebook and Twitter was one of factors that made the information control by those countries difficult. We should think about the possibility of sudden change in North Korea. It is necessary to compare and analyze the political, economic and social characteristics between those countries and North Korea. It shouldn’t be just a simple comparison or analysis. It should provide basic data for objective and quantified index development in relation to sudden change in North Korea.