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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.
모바일 인스턴트 메신저 이용자의 만족도, 충성도와 전환의도에 영향을 미치는 요인 연구
이새봄 ( Sae Bom Lee ),왕아금 ( Ya Qin Wang ),서영호 ( Yung Ho Suh ) 한국품질경영학회 2015 품질경영학회지 Vol.43 No.4
Purpose: The Purposes of this study are (1) to examine why users are communicating through MIM (2) to understand what factors impact these users’satisfaction and loyalty.Methods: We use a questionnaire survey to collect 256 data on users’perceptions of Kakaotalk. We also use a structural equation modeling method by using AMOS 18.0.Results: Company trust, communication voice, connectedness, and perceived network size are found to be statistically significant factors affecting. Also, satisfaction influence on word of mouth and intention to switch.Conclusion: This study develops a research model from the MIM context. We suggest three points of view as company characteristics, device interactivity, and social factor. We examine the determinants of users’satisfaction and loyalty. The results can offer valuable insights for future mobile services research.