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이건영(Geon-Young Lee),정유석(Yoo-Suk Jung),홍만표(Man-Pyo Hong) 한국정보과학회 2000 정보과학회논문지 : 시스템 및 이론 Vol.27 No.11
프로그램의 실행시간은 캐쉬 메모리의 효율적 사용과 밀접한 관계가 있다. 특히 간섭 실패는 프로그램의 성능에 큰 영향을 미치지만 나타나는 형태가 불규칙적이므로 예측하기가 매우 어렵다. 본 논문에서는 직접 사상 캐쉬전략을 사용한 완전 중첩 루프 내 배열의 캐쉬 실패율(cache miss ratio)을 구하는 분석적 모델을 제시한다. 논문에서 제시한 모델은 임의의 캐쉬 위치에 각 배열이 접근한 시간을 기반으로 다음주기에서 캐쉬 실패의 발생 여부를 예측하는데, 간섭으로 발생한 캐쉬 실패 개수에 대해 기존에 제시된 모델보다 더 빠르고 정확한 예측이 가능하다. 특히, 한문장의 수행시간 예측시간은 배열의 크기와 독립적이기 때문에, 전체 프로그램의 수행시간 예측은 배열의 크기 및 문장의 반복 회수 배만큼 빠른 결과를 보여준다. 본 모델은 프로그램의 성능예측 뿐만 아니라 데이타 지역성의 최적화, 캐쉬 구성, 스케쥴링 등에서도 이용 가능하다. Program execution time is closely related with the efficient utilization of cache memory. Moreover, the time is greatly affected by the interference miss, but the cache miss behavior of a program is highly unpredictable. In this paper we present novel analytical model of the cache miss ratio consisting mainly of array operation inside nested loops for direct-mapping caches, and using this model we predict the program execution time. Our model predicts whether or not cache miss occurs in next period based on access time of array being loaded in cache. This model is faster and more accurate than previous models. A significant advantage is that the calculation time is proportional to the number of array references in the program. Applications of this model range from performance evaluation and prediction to data locality optimizations.
이건영(Geon-Young Lee),강윤호(Yun-Ho Kang),이근상(Geun-Sang Lee),이삼노(Sam-No Lee),김종규(Jong-Kyou Kim) 한국마린엔지니어링학회 2007 한국마린엔지니어링학회 학술대회 논문집 Vol.2007 No.-
연안에서 해양개발, 수로유지 및 수질 개선 등을 목적을 준설이 시행되고 있다. 수질 개선을 목적으로 하는 준설공사의 경우 준설량을 정확하게 예측하는 것이 공사비용 및 공사기간을 결정하는데 매우 중요한 요소이다. 본 논문에서는 현재 국내에서 가장 널리 사용되고 있는 양단면평균법과 GSIS의 기법 중 역거리가중(Inverse Distance Weight; IDW) 보간법, Kriging 보간법 및 불규칙삼각망(Triangulated Irregular Network; TIN) 보간법을 이용하여 준설량을 산정하였다. 또한 GSIS를 이용하여 준설공사를 체계적으로 관리할 수 있는 준설관리체계 구축안을 제시하였다. In coastal areas, dredging is carried out for the purpose of ocean development, channel maintenance, water quality improvement, and so on. An accurate estimate of the dredging volume can decrease excessive amounts of uncontaminated dredging materials. Also, it can minimize the period and expense of the construction. In the moment, the end area formula method is generally used for calculating dredging volume. The position of sediment investigation is decided empirically through in-situ survey. However, in foreign countries the investigation is decided before dredging through an effective terrain analysis. This study is focused on making a management tool for marine dredging using Geo-Spatial Information System(GSIS). The Marine Dredging Management System(MDMS) developed in this study is a GSIS-based integrated system consisting of three compartments such as estimation of dredging volume, prediction of flow currents and water quality parameters.
체외 수정시술에 의한 쌍태 임신과 정상 쌍태 임신의 임신 결과와 신생아 예후 비교
김병욱(Byung Wook Kim),이건영(Geon Young Lee),이영진(Young Jin Lee),홍민(Min Hong),이정렬(Jeong Yel Lee),이준희(Jun Hee Lee),정인배(In Bai Chung) 대한산부인과학회 2001 Obstetrics & Gynecology Science Vol.44 No.11
N/A Objective : To compare the obstetric complications and perinatal outcomes of twin pregnancies conceived by In Vitro Fertilization and Embryo Transfer to twin pregnancies conceived naturally. Methods : Maternal and neonatal data were reviewed for all twin pregnancies. All twin pregnancies(n=116) were divided into IVF twin pregnancyes group(n=43) and naturally conceived twin pregnancyes(n=72). The obstetric and perinatal outcomes were compared and analysed. Statistical analysis was performed using student's t-test, χ2 test, and Fisher exact test. Statistical significance was defined as p<0.05. Results : There were no significant differences in maternal age and gestational age between two groups but nulliparity was higher in IVF-ET twin group than naturally conceived twin group. Also no differences of obstetrics and perinatal outcomes were seen between two groups. Conclusion : Although twin pregnancies following IVF-ET are more likely to result in bad prognosis, in this study obstetric and perinatal outcomes are comparable to those of naturally conceived twin pregnancies.
이상학(Sang Hag Lee),최현일(Hyun Il Choi),김병욱(Byung Wook Kim),이건영(Geon Young Lee),차동수(Dong Soo Cha),이영진(Young Jin Lee) 대한산부인과학회 2001 Obstetrics & Gynecology Science Vol.44 No.11
N/A Objective : The purpose of this study was to review the clinical features, treatments and prognosis of the borderline malignant tumors of the ovary. Methods : Thirty-two patients with borderline malignant tumors of the ovary were admitted, operated and confirmed with postoperative histopathological study at department of obstetrics and gynecology, Yonsei University Wonju Christian Hospital. The data were collected retrospectively and all charts were reviewed. Results : The incidence of borderline malignant ovarian tumor was 19.2% (32/167). Age distribution revealed between 18 and 77 years old, the mean age was 43.1 years old. As for the parity distribution of borderline malignant tumor, nulliparity was most common (43.8%). The most common chief complaint was abdominal distension (34.4%). Histologic subtypes were mucinous in 19 cases (59.4%), serous in 13 cases (40.6%). According to FIGO classification, 28 cases (87.5%) were stage I, 1 case (3.1%) was stage II, 3 cases (9.4%) were stage III. Sixteen cases (50%) underwent conservative surgery (unilateral salpingooophorectomy or cystectomy). Sixteen cases (50%) were treated with total abdominal hysterectomy and bilateral salpingooophorectomy. Fifteen cases (46.9%) received adjuvant postoperative chemotherapy. Excluding 5 cases lost to follow up, patients were alive and were followed from 9 months to 100 months. (mean 36 months)
여수국가산업단지 인근 지역 대기오염물질 농도에 영향을 미치는 요인분석
김민영,변정훈,이영훈,이건영,한지은,이예림,임지현,장봉기 순천향대학교 기초과학연구소 2022 순천향자연과학연구 논문집 Vol.28 No.1,2
Eight monitoring stations in the Yeosu National Industrial Complex will determine the concentration of air pollutants measured every hour in 2019, analyze what factors affect them, and how they correlate with the air pollutant measurements. Six air pollutants (SO2, NO2, O3, CO, PM-10 and PM-2.5) measured at eight monitoring stations around Yeosu National Industrial Complex (Seogang-dong, Wolnae-dong, Munsu-dong, Yeocheon-dong, Deokchung-dong, Hwayang-myeon, Yulchon-myeon, Samil-dong) the measurement data for each hour of the year were downloaded to analyze the concentration by weather condition, time zone, season, separation distance from Yeosu Industrial Complex, and separation distance from Gwangyang Industrial Complex. SO2, NO2, and CO concentrations were significantly higher in winter, significantly lower in summer, and O3, PM-10, and PM-2.5 concentrations were significantly higher in spring. SO2, CO, PM-10, and PM-2.5 concentrations were significantly higher between 10 a.m. and 12 p.m., NO2 concentrations were significantly higher between 7 a.m. and 9 a.m., and O3 concentrations were significantly higher between 13 p.m. and 15 p.m.(p<0.001). The concentration of air pollutants (SO2, NO2, CO, PM-10, PM-2.5) excluding O3 was found to have a negative (-) correlation with weather condition, and in the case of O3, it was found to have a positive (+) correlation with PM-10, PM-2.5, temperature and wind speed. It was confirmed that the concentration of air pollutants emitted from the Yeosu National Industrial Complex differs depending on the season, time and distance to the industrial complex. This study aims to establish measures to minimize health damage to residents living relatively close to the industrial complex and contribute to the establishment of management and response measures according to the properties of substances to reduce the concentration of air pollutants in the future.
이상학,김병욱,이영심,정인배,이영진,한혁동,이건영 대한산부인과학회 2001 Obstetrics & Gynecology Science Vol.44 No.9
Anemia is the one of the most common complications among pregnant women, but sideroblastic anemia is very rare condition. The sideroblastic anemias have diverse etiologies but have in common an impaired biosynthesis of heme in the erythroid cells of the marrow. The ringed sideroblasts in the bone marrow aspirate is diagnostic hallmark of sideroblastic anemia. We report here a prenatal care and delivery in a pregnant woman complicated by hereditary sideroblastic anemia. This patient was treated with 200mg of pyridoxine per day during entire pregnancy period and further more, 4mg of oral folate per day was supplemented because concomitant folate deficiency is frequent in case of erythroid hyperplasia. Intermittently, the transfusions of packed red blood cells were required to maintain the hemoglobin level in the 9 to 10gm/dl range. We have experienced healthy maternal and perinatal outcome.