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Comparative evaluation of runoff and water quality using HSPF and SWMM
Lee, Sae-Bom,Yoon, Chun-Gyeong,Jung, Kwang Wook,Hwang, Ha Sun IWA Publishing 2010 Water Science & Technology Vol.62 No.6
<P>Stormwater pollution is the untreated contaminated water that drains into natural waterways from land uses within an urban catchment. Several studies have demonstrated the deterioration of water quality in receiving bodies of water caused by stormwater runoff. The data have reported that urban runoff play primary roles in degrading water quality in adjacent aquatic systems. The accurate estimation of non-pollutant loads from urban runoff and the prediction of water quality in receiving waters are important. The objective of this paper is to assess the applicability of the watershed scale hydrologic and water quality simulation models SWMM and HSPF to simulate the hydrology of a small watershed in the Han River Basin. Monitoring was performed in small scale watersheds, which is homogeneous land use. The applicability of SWMM and HSPF model was examined for small watersheds using hourly monitoring data. The results of SWMM were reasonably reflected with observed data in small scale urban area. HSPF model was effective at specifying parameters related to runoff and water quality when using hourly monitoring data. The watershed models used in this study adequately simulated watershed characteristics and are recommended to support watershed management.</P>
( Sae Bom Shin ),( Hyeon Jeong Lee ),( Jong Wook Lee ),( Woo Sung Min ),( Ki Seong Eom ) 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1
Background: Thrombophilia is a group of hereditary and acquired conditions which has a propensity of repeated formation of thrombi in the veins and/or arteries. Many conditions are involved in thrombophilia. Homocysteine is known to damage the vascular endothelium and promote thrombosis. Acquired hyperhomocysteinemia can be caused by vitamin B 12, vitamin B6, or folate deficiency. Here, we report a case of acquired thrombophilia with recurrent venous thromboembolism developed after total gastrectomy. Case Presentation: A 32 year-old male was referred to Abu Dhabi for evaluation of a recurrent venous thromboembolism. In 2011, he had bariatric surgery for morbid obesity. Since April 2012 following the surgery, he was admitted repeatedly for recurrent venous thromboembolism. In our hospital, all the routine laboratory tests were within the reference ranges, except for serum vitamin B12 (65 pg/mL, ref range, 180 - 914) and homocysteine level (21.9mol/L, ref range, 3.0 - 15.0). Screening for inherited thrombophilia revealed negative results. Other tests for acquired thrombophilia were all negative. He kept on heparinization as well as warfarin. Vitamin B12 replacement was initiated intramuscularly at a dose of 1,000g every other day for 1 week. Serum homocysteine levels fell to 13.7 mol/L in 2 weeks after vitamin replacement. Conclusion: It is important to measure serum homocysteine level in all patients with acquired thrombophilia to avoid missing this rare but potentially curable condition. Results from randomized clinical trials have been unable to translate convincingly homocysteine lowering into improved clinical outcome for the secondary prevention of cardiovascular disease. However, because most randomized intervention trials published to date have included patients with only mildly elevated homocysteine levels, the role of combined vitamin supplementation should be clarified in patients with moderately or severely elevated homocysteine levels in the future trials.
Technostress from mobile communication and its impact on quality of life and productivity
( Sae Bom Lee ),( Sang Chul Lee ),( Yung Ho Suh ) 한국품질경영학회 2015 한국품질경영학회 학술대회 Vol.2015 No.2
Purpose: Information communication technology (ICT) contains both a positive and negative side. This study investigates the negative side such as induced stress and its impacts on the productivity and quality of life of business workers. This study contributes to this area of research by focusing on social interactions and personal life after work hours in understanding the phenomenon of technostress. Methodology/Approach: This study examines how social interaction stressors and personal life stressors are related to use of mobile instant messenger after work hours. The related strain is regarded as having a negative influence on productivity and quality of life. A model was proposed and tested using a web-based and offline (face-to-face) survey was employed. Confirmatory factor analysis and structural equation model analysis were implemented in AMOS 18.0. Findings: The study found that social insecurity, invasion of life, and work-home conflict had a positive relation with perceived strain, which in turn had a negative effect on life satisfaction. On the other hand, perceived strain positively affected productivity. Originality/Value: Conclusively, this study developed a model for technostress from mobile communication and empirically tested the validity of the proposed model.
가압조건의 마이크로웨이브 추출에서 몇가지 인삼성분의 추출특성 모니터링
이새봄(Sae-Bom Lee),이기동(Gee-Dong Lee),정용진(Yong-Jin Jeong),김정숙(Jeong-Sook Kim),권중호(Joong-Ho Kwon) 한국식품영양과학회 1999 한국식품영양과학회지 Vol.28 No.5
천연물로부터 목적성분을 신속하게 추출할 수 있는 가압조건의 마이크로웨이브 추출방법을 이용하여 가용성 인삼성분의 추출에 따른 추출물의 페놀성 화합물 함량, 갈색도 및 전자공여작용의 추출특성을 반응표면분석에 의해 모니터링하였다. 총 페놀성 화합물의 함량에 대한 최대값은 에탄올 농도 67.88%, 추출온도 145℃, 추출시간 6.24분에서 21.65㎎/100ml로 나타났다. 총 페놀성 화합물의 함량은 추출온도가 높고 에탄올 농도가 높을수록 증가하였다. 갈색도는 에탄올 농도 67.21%, 추출온도 147℃, 추출시간 6.02분에서 가장 높은 수치를 나타내었고, 추출온도가 높을수록 증가하였다. 전자공여작용에 대한 최대값은 에탄올 농도 54.33%, 추출온도 147℃, 추출시간 6.11분에서 24.50 units이었다. 전자공여작용은 추출온도가 높을수록 증가하였으며, 에탄올 농도가 50~65% 범위에서 가장 높았다. Microwave extraction system equipped with closed vessels, which is known to rapidly extract target compounds from natural products, was applied to monitor the changes in phenolic compounds, browning color intensity and electron donating ability by using response surface methodology(RSM). Maximum content of phenolic compound was 21.65㎎/100ml in 67.88% of ethanol concentration, 145℃ of extraction temperature, and 6.24 min of extraction time. The phenolic compounds in extracts are dependent on the increase of the extraction temperature and the ethanol concentration. Browning color intensity, which was maximized in 67.21%, 147℃, and 6.02 min, was proportional to the increase of the extraction temperature. Maximum value of electron donating ability was 24.50 units in 54.33%, 147℃, and 6.11 min. The electron donating ability of extracts was dependent on the increase of extraction temperature and maximized in the range from 50 to 65% of ethanol concentration.