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Youngtae Cho 한국사회학회 2005 한국사회학회 사회학대회 논문집 Vol.2005 No.-
This article examines the contemporary health status of Metropolitan Seoul adult residents, employing activity limitations and chronic disease status. To take into account the recent and unprecedented pattern of population redistribution by socioeconomic status in Metropolitan Seoul, we consider individual-and area-level risk factors both discretely and simultaneously, utilizing multilevel analysis techniques. Findings suggest a significant degree of uneven spatial distribution of adverse health across small areas in Metropolitan Seoul. While most individual factors are associated with the risk of adverse health outcomes, in a pattern generally similar to that observed in Western societies, none of the area-level risk factors is associated with adverse health in this population. Of particular interest is that individuals of very low educational attainment are at substantially higher risk of activity limitations and life-threatening chronic diseases.
롤러 가압 임프린트 공정에서 잔류막에 미치는 공정 변수의 영향
조영태(Youngtae Cho),정윤교(Yoon-Gyo Jung) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.5-3
In order to apply the nano imprint technology in the large area process, roller pressing is promising because of low cost and high productivity. When pressing mold by roller, liquid resin is locally squeezed by mold and substrate. In this study, the main focus is to understand which process parameter affects the residual layer. To do this, simple analytic model was introduced. Especially, we insert aspect ratio term in the equation. As a result, when the aspect ratio of pattern in the mold increases, the thickness of residual layer also increases. For the conclusion, the uniformity of residual layer could be accomplished by the control of velocity and pressing force in roller pressing imprint process.
조영태(Youngtae Cho),안형식(Hyong-sik Ahn),정성원(Sung Won Jung) 한국인구학회 2001 한국인구학 Vol.24 No.2
지난 20 여년간 미주 한인의 수는 급속도로 증가하였다. 하지만 이들의 건강에 관한 연구는 거의 이루어지지 않았다. 본 연구는 기대여명(期待餘命), 연령별 사망률, 그리고 사망의 주요원인 등을 통한 본국 거주 한국인과 미주 한인의 건강 수준 비교를 그 목적으로 한다. 분석결과 전반적으로 미주 한인이 같은 연령의 한국인에 비해 기대여명은 더 높고, 연령별 사망률은 더 낮게 나타났다. 사망의 주요 원인에 관한 분석 결과, 미주 한인에게 있어서 신생물 (Neoplasms)로 인한 사망이 빈번하게 발견되었으나 소화기계 질환 (Diseases of the digestive system), 특히 간질환으로 인한 사망률은 동일연령의 본국 거주 한국인에 비해 크게 낮은 것으로 나타났다. 두 인구 집단간 큰 차이를 보이는 신생물과 소화기계 질환에 대해 인구 사회 경제적 요소들을 통제하여 회귀 분석을 실시한 결과 신생물로 인한 사망 비율의 차이는 사라졌지만, 소화기계 질환으로 인한 사망 비율의 차이는 변함이 없었다. 결론적으로 미주 한인이 본국 거주 한국인에 비해 상대적으로 양호한 건강상태를 유지하고 있다고 볼 수 있고, 이는 미주 한인의 교육수준이 상대적으로 높고, 이민 후 보다 건강한 생활습관을 습득하기 때문이라고 여겨진다. 그러나 미주 한인의 경우 이질적인 문화와 언어 사용에 의한 정신적 스트레스와 소수민족이기 때문에 보건정책의 혜택에서 쉽게 소외된다는 사실 등을 고려할 때 본 연구 결과는 보다 지속적고 심도있는 연구의 필요성을 시사한다. Even though the number of Korean Americans has dramatically increased over the last 20 years, there have been very few studies that have examined the health of this population. This paper investigates the contemporary health status of Korean Americans in comparison to Koreans, employing mortality related health measures: life expectancy, age-specific death rates, and leading cause of death. Overall, we find that Korean American adults enjoy longer life expectancy and lower age-specific death rates than do their Korean counterparts, suggesting superior health status of the former as compared to the latter. Comparison of leading causes of death indicates that Korean American adults (age of 25-64) are more likely to die from neoplasms than are their Korean counterparts, while Koreans show a dramatically higher probability of death from liver-related diseases than Korean Americans. When these two causes of death are regressed on various demographic and socioeconomic factors. the difference in prevalence of neoplasms between the two populations disappeared. while that of liver-related diseases remains unaffected. Based on the outcomes from this research, we suggest that Korean Americans are a self-selected group in terms of health and socioeconomic status, and they adopt healthy behaviors after immigration. This has resulted in the relatively superior health of Korean Americans as compared to Koreans.
Youngtae Byun,Junsik Ahn,Deuk-Su Kim,Jeong-Hwan Lee,Young-Kug Choo,Kwang-Hui Cho,Kisung Ko 한국당과학회 2013 한국당과학회 학술대회 Vol.2013 No.1
Plants are considered to represent a promising expression system for production of valuable recombinant immunotherapeutic proteins. Plants as an expression system has several advantages: lack of animal pathogenic contaminants, low cost of production, and ease of agricultural scale-up compared to available systems. We have studied to enhance expression efficiency of immunotherapeutic recombinant protein GA733, colorectal cancer vaccine candidate with fusion of human IgG Fc fragment and KDEL, endoplasmic reticulum retention signal resulting in GA733-FcK. Furthermore, selectively harvesting plant tissues highly expressing GA733-FcK from entire plant biomass is essential to improve final productivity. Thus, in this study, we have established several transgenic plant lines to highly express GA733-FcK and investigated variable expression level of recombinant GA733-FcK proteins along with leaf and stem tissues. The mRNA and protein levels in top, middle, and bottom leaf or stem tissues were observed using real time PCR and immunoblot analyses. In addition, the glycan structures and DNA methylation patterns were studied with respect of aging of plant tissues.
Monte-Carlo 모의실험을 이용한 초·중·고등학교의환기부족 평가
최영태(Youngtae Choe),박진현(Jinhyeon Park),김은채(Eunchae Kim),류현수(Hyoensu Ryu) 김동준(Dong Jun Kim),민기홍(Kihong Min),정다영(Dayoung Jung),우병렬(Byung Lyul Woo),조만수(Mansu Cho),양원호(Wonho Yang) 한국환경보건학회 2020 한국환경보건학회지 Vol.46 No.6
Objectives: Indoor air quality has become more important aspeople spend most of their times indoors. Since students spend most of their times at home or at school, they are more likely to be exposed to indoor air pollutants. Ventilation in school classrooms can affect health and learning performance. In this study, ventilation deficiency was evaluated in school classrooms using Monte Carlo simulation. Methods: This study used sensor-based monitoring for six months to measure carbon dioxide (CO2) concentrations in classrooms in elementary, middle, and high schools. The volume of the classroom and the number of students were investigated, and the students’ body surface area was used to calculate the CO2 emission rate. The distribution of ventilation rates was estimated by measured CO2 concentration and a massbalance model using Monte Carlo simulation. Results: In the elementary, middle, and high schools, the average CO2 concentrations exceeded 1000 ppm, indicating that the ventilation rates were insufficient. The ventilation rates were deficient from July to August and in December, but showed relatively high ventilation rates in October. Forty-three percent of elementary schools, 56% of middle schools, and 62% of high schools showed insufficient ventilation rates. Conclusions: The ventilation rates calculated in elementary, middle and high schools were found to be quite insufficient. Therefore, proper management is needed to overcome the lack of ventilation and improve air quality.
최영태(Youngtae Choe),허정(Jung Heo),박진현(Jinhyeon Park),김은채(Eunchae Kim),류현수(Hyoensu Ryu),김동준(Dong Jun Kim),조만수(Mansu Cho),이채관(Chaekwan Lee),이종대(Jongdae Lee),양원호(Wonho Yang) 한국환경보건학회 2020 한국환경보건학회지 Vol.46 No.3
Objectives: Much attention has been paid to indoor air quality. Ventilation within schools is important because of indoor air quality and its effect on health and learning performance. In this study, we evaluated the carbon dioxide (CO2) concentrations and ventilation rates in schools. Methods: This study measured the concentration of CO2 in elementary, middle, and high school classrooms over six months. The seasons during the study were summer, fall, and winter. Sensor-based monitoring was used and the basic characteristics of the classroom were investigated. The body surface area of the students was used to calculate the CO2 generation rate, and the air change per hour (ACH) was evaluated using mass balance modeling. Results: The average CO2 concentration measured in most schools exceeded 1000 ppm. The ventilation rates varied from season to season. Compared to the recommended ventilation rate of 4.9 ACH, the roughly 3 ACH calculated in this study indicates that most schools possessed insufficient ventilation. Conclusions: The concentration of CO2 in school classrooms could be an indicator of indoor air quality and can affect students learning ability. In this study, CO2 concentrations exceeding the standard indicate a lack of ventilation along with problems with indoor air quality. Therefore, appropriate improvements are needed to overcome these problems.