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이정규 한국수자원학회 1987 물과 미래(한국수자원학회지) Vol.20 No.4
해양방류구에서 연직밀도구배가 있고, 임의의 수류의 방향과 속도를 가지고 흐르는 주변수중으로 방류되는 폐수의 초기 최소 희석도와 최종상승고를 예측하는 개선된 수학적 모형을 제시하였다. 밀도구배가 없는 균일한 수중에서 선분플륨의 방류실험을 통하여 얻은 결과를 이용하여 선형밀도구배를 가진 수중으로 방류되는 경우에 대한 해가 유도되었다. 유속, 유향, 밀도의 성층화 및 노즐의 형태에 대한 영향이 고찰되었으며 계산결과는 실험치와 비교되었다. An improved mathematical model is presented which will predict the initial minimum dilution and terminal rise height of wastewater discharged from ocean outfalls into density stratified water flowing at an arbitary direction and speed. Solutions are derived for discharge into linearly stratified water, based on three-dimensional experimental work on line plumes in unstratified currents. The effects of current speed, direction, stratification and type of nozzle are discussed, and the model predictions are compared to laboratory experiments.
이정규 한국수자원학회 1989 물과 미래(한국수자원학회지) Vol.22 No.2
부정류지하수 흐름에 대한 편미분방정식 Blotzmann 변환을 통하여 상미분방정식으로 변환되었으며 유한차분법을 이용하여 수치해를 구하였다. Richardson법과 차분식을 이용하여 미지초기수면구배(missing intial slope)를 구하는 새로운 방법이 제안되었다. 본 연구에서 제안된 방법으로 초기수면구배를 구하였으며 이 값들은 다른 연구결과와 비교한 바 아주 좋은 일치를 보여주었으며 또한 이 방법이 해를 구하는데 간편하고 쉬운 방법임을 보여주었다. The partial differential equation of the groundwater flow was reduced to an ordinary differential equation by the Boltzmann transformation. Its numerical solutions were obtained by the finite difference method and the new method to get the initial missing slope using the Richardson method and the finite difference equation was proposed. The solutions computed by the newly proposed method were compared with investigator's computations and they showed a satisfactory agreement and that the proposed method is easy and simple to get solutions.
이정규,김윤진,이상엽 부산대학교 병원 암연구소 2008 부산대병원학술지 Vol.- No.23
Purpose: Recently, several biological markers have been identified as risk factors for cardiovascular disease and are also associated with an increase in the risk of metabolic syndrome. However, little is known about the relative importance of homocysteine in the association with metabolic syndrome. We thus compared homocysteine and their association with metabolic syndrome. Subjects and Methods: We measured homocysteine in 4,624 Korean adults without a medical history of cardiovascular disease, acute diseases, or cancer. Metabolic syndrome was defined using criteria from the updated National Cholesterol Education Program Adult Treatment Panel III (ATP III) and the International Diabetes Federation (IDF). Results: The prevalence of metabolic syndrome by the ATP Ⅲ was higher than the prevalence according to the IDF criteria (16.4% vs. 12.9%, respectively). All clinical and metabolic variables showed significant differences between subjects with and without metabolic syndrome (P<0.001). Subjects with metabolic syndrome also had significantly higher WBC counts, hs-CRP, homocysteine, cystatin C uric acid, and GGT levels compared to subjects without metabolic syndrome (P<0.001). Correlations between metabolic syndrome and homocysteine was weak (partial correlation coefficient <0.10) and difficult to interpret. Conclusions: These findings suggest that there was weak relationship with homocysteine and metabolic syndrome.