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허베이 스피리트호 원유유출시 방제작업과 대사증후군의 연관성
이익진,장봉기,이종화,손부순,정해관,하미나,최영현,박명숙,Lee, Ik-Jin,Jang, Bong-Ki,Lee, Jong-Wha,Son, Bu-Soon,Cheong, Hae-Kwan,Ha, Mina,Choi, Young-Hyun,Park, Myungsook 한국환경보건학회 2015 한국환경보건학회지 Vol.41 No.5
Objectives: We aimed to assess the risk of metabolic syndrome one year after the 2007 Hebei Spirit oil spill in Taean, Korea among people exposed to spilt oil during clean-up work. Methods: A total of 6,923 adults, including 3,019 males and 3,904 females, participated in the study. Health examinations and blood tests (total cholesterol, triglycerides, HDL, fasting blood sugar) were performed. A logistic regression model adjusting for age, gender, smoking history, drinking history, income, education, and marital status was used to estimate the risk of metabolic syndrome associated with the level of oil spill exposure. Results: The prevalence of metabolic syndrome was 24.9% among males and 18% among females. Compared with people living within 20 km of the coastline, the risk of metabolic syndrome among people living within 0.8 km of the coastline was significantly higher (male OR=1.696, 95% CI=1.320-2.178, female OR=1.992, 95% CI=1.549-2.561), including a significant dose-response relationship for distance from early contaminate coastline (p<0.001). The risk of metabolic syndrome was higher according to the increase of duration of cleaning work. The risk of metabolic syndrome among people who participated in the clean-up work for more than 116 days, compared with people who participated in the cleaning work for or less 14 days, was significantly higher (male OR=1.845, 95% CI=1.448-2.353, female OR=1.752, CI=1.378-2.228), with a significant dose-response relationship for days of clean-up work (p<0.001). Conclusion: This study showed that there is a significant association between exposure to the oil spill during the clean-up work, distance from early contaminate coastline and the risk of metabolic syndrome in a doseresponse manner.
이익진 ( Ik Jin Lee ),안규동 ( Kyu Dong Ahn ),조광성 ( Kwang Sung Cho ),김남수 ( Nam Su Kim ),이성수 ( Sung Su Lee ),이병국 ( Byung Kook Lee ) 한국산업위생학회 2004 한국산업보건학회지 Vol.14 No.3
This study is to find out which the elements could cause the pollution in the soil, and to what the degree of the pollution has been progressed so far, with samples of the soils from such work places as 6 lead storage battery factories, a primary lead smelting factory, and a litharge factory, and finally from the area that is considered not to have been polluted by any industrial activities. The study variables are the number of employees, the date of foundation of workplace, the amount of use of lead, the size of the land, the size of facilities, and the capacity of dust collector. We inspected the accuracy and the precision of the portable X-ray Fluorescence which has been rarely used in this nation. Followings are the details of our inspection. 1. For the verification of the accuracy and the precision, we prepared three different concentrations. For the accuracy, we had 219.6% collection rate from low concentration, 97.8% from middle concentration, and 101.4% form high concentration. We found the variation modules by concentration, for the precision, to be 23.1% from low concentration, 1.91% from middle concentration, and 0.66% from high concentration, the result of which shows us that the portable X-ray fluorescence`s accuracy and precision are somewhat low with low concentration, and high with middle or high concentration. 2. The lowest level of pollution in workplace caused by lead was that of D company`s with its average concentration was 182±2.512mg/kg the highest, C company`s with 72,069±2.548mg/kg. 3. We studied the association the date of foundation of workplace, the amount of use of lead, the size of the land, the rate of the building occupation of the land, lead amount in the soil, the capacity of the dust collector and devided the capacity of the dust collector by the size of the building to find out the relation between the dust collector`s affection per unit area and the rate of lead in the soil. From this study, which indicate the older the date of foundation of workplace, the smaller using lead, occupation of the land, the building occupation of the land, the capacity of the dust collector, the rate of the dust collector`s affection per unit area. 4. We made a comparitive study of only the groups of the storage battery company in the same way as above. From this study, we had almost the same result as we did from the study on the whole lead-related workplaces; the only different results we got from the variation of the amount the number of employees, which indicates the bigger the number of employees, the less soil pollution. It shows and the result is statistically worthy of attention(p<0.05). Is judged that use about utilization because it analytical accuracy and precision are high and have a lot of advantages about free medical care pretreatment and sample ore that analysis is difficult with galena specially in concentration more than constant level to inflect portable XRF in measurement about lead concentration among soil in place of business and estimation.
이익진(Ikjin Lee),강경환(Kyeonghwan Kang) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
Metamodeling is a method that approximates the actual model and has been used in various fields to solve engineering problems with high computational cost. However, if the number of design variables increases, the number of samples required to satisfy a reasonable accuracy increases exponentially, making it difficult to apply. However, there is a lack of research on a practical metamodeling technique to solve this problem. In this study, a meta-modeling and sampling strategy that increases the efficiency of metamodel generation by decomposing design variables and creating sub-space to perform reliability analysis is proposed. This method is used to obtain optimal design of high-dimensional and high-cost simulation models. The numerical example shows that the proposed method shows that the efficiency is significantly improved compared to the conventional approach.