우리나라 남성 흡연자의 금연의향 담배가격 분석

정우진,이선미,신가영,임승지,조경숙,Chung, Woo-Jin,Lee, Sun-Mi,Shin, Ka-Young,Lim, Seung-Ji,Cho, Kyung-Sook 대한예방의학회 2008 예방의학회지 Vol.41 No.3

Objectives : The purpose of this study was to estimate the willingness to quit cigarette price among Korean male adults, and to examine the factors affecting the willingness to quit cigarette price. Methods : The data was collected by a random digit dial telephone survey. 702 samples were analyzed by using t-tests, ANOVA and OLS regression analysis. To estimate the willingness to quit cigarette price, smokers were asked dichotomous questions with open-ended follow-up and the starting point of the price was randomized by one of 5 bid prices elicited from a pilot study. Results : The mean of the willingness to quit cigarette price was 4,287 Won per package, which was about 2,000 Won higher than the mean of the actual price the smokers now paid. About 41% of respondents were willing to quit smoking if the price of cigarette would be increased by 3,000 Won, and if the price would be increased by 20,000 Won, all respondents were willing to quit smoking. The factors associated with the willingness to quit cigarette price were the place of residence, the amount of smoking and the degree of exposure to smoking through the mass media. Conclusions : The results showed that to get people to quit smoking, increasing the cigarette price would obviously be effective and much higher prices have a greater effect. Furthermore, to enlarge the effect of increased cigarette prices, providing more cessation programs to small towns, reducing the amount of smoking and decreasing or prohibiting advertisements of cigarettes and smoking in the mass media will be efficient.

음주의 사회경제적 비용 추계

정우진,전현준,이선미,Chung, Woo-Jin,Chun, Hyun-Jun,Lee, Sun-Mi 대한예방의학회 2006 예방의학회지 Vol.39 No.1

Objectives: We wanted to estimate the annual socioeconomic costs of alcohol drinking in Korea. Methods: The costs were classified as direct costs, indirect costs and the other costs. The direct costs consisted of direct medical costs, indirect medical costs and subsidiary medical costs. Particularly, the medical costs and population attributable fraction for disease were considered to reflect the calculation of the direct medical costs. The indirect costs were computed by the extent to which the loss of productivity and loss of the workforce might have occurred due to changes in mortality and morbidity according to alcohol drinking. The other costs consisted of property loss, administration costs and costs of alcoholic beverage. Results: The annual costs, which seemed to be attributable to alcohol drinking, were estimated to be 149,352 hundred million won (2.86% of GDP). In case of the latter, the amount includes 9,091 hundred million won for direct costs (6.09%), 62,845 hundred million won for the reduction and loss of productivity (42.08%), 44,691 hundred million won for loss of the workforce (29.92%), and the other costs (21.91%). Conclusions: Our study confirms that compared with the cases of Japan (1.9% of GNP) and the other advanced countries (1.00-1.42% of GDP), alcohol drinking incurs substantial socioeconomic costs to the Korean society. Therefore, this study provides strong support for government interventions to control alcohol drinking in Korea.

우리나라 성인 남성의 흡연여부와 흡연량에 미치는 담배가격의 효과

정우진,이선미,최승주,신가영,조경숙,임승지,Chung, Woo-Jin,Lee, Sun-Mi,Choi, Sung-Joo,Shin, Ka-Young,Cho, Kyung-Sook,Lim, Seung-Ji 대한예방의학회 2007 예방의학회지 Vol.40 No.5

Objectives: To determine the impact of cigarette prices on the decision to initiate and quit smoking by taking into account the interdependence of smoking and other behavioral risk factors. Methods: The study population consisted of 3,000 male Koreans aged ${\ge}20$. A survey by telephone interview was undertaken to collect information on cigarette price, smoking and other behavioral risk factors. A two-part model was used to examine separately the effect of price on the decision to be a smoker, and on the amount of cigarettes smoked. Results: The overall price elasticity of cigarettes was estimated at -0.66, with a price elasticity of -0.02 for smoking participation and -0.64 for the amount of cigarettes consumed by smokers. The inclusion of other behavioral risk factors reduced the estimated price elasticity for smoking participation substantially, but had no effect on the conditional price elasticity for the quantity of cigarettes smoked. Conclusions: From the public health and financial perspectives, an increase in cigarette price would significantly reduce smoking prevalence as well as cigarette consumption by smokers in Korea.

우리나라 여성의 만혼(晩婚) 이 첫 출산간격에 미치는 영향

정우진,이경애,이선미,Chung, Woo-Jin,Lee, Kyoung-Ae,Lee, Sun-Mi 대한예방의학회 2006 예방의학회지 Vol.39 No.3

Objectives: The purpose of this study was to examine the effect of women's late age of marriage on the interval between marriage and their first birth Methods: Data from Year 2000 Korea National Fertility Survey was collected through direct interview questionings, and the data was analyzed based on randomly selected sampling. In particular, the married women (N=5,648) were analyzed for the factors that determined the first-birth interval by performing Cox's proportional hazard model survival analysis. Results: Unlike previous findings, the woman whose age of marriage was 30 or more was more likely to delay the birth of her first baby than were the other women who married earlier. Further, a woman's age at marriage, a woman's residence before marriage, her husband's religion, her husband's level of education and the difference in age between the woman and her husband significantly influenced the first-birth interval. In contrast, for a married woman, her age, level of education, current residence and religion were not significant predictors of her first birth interval. Conclusions: Our study showed that women who married at the age of 30 years or more tend to postpone their first birth in Korea. When facing the increasing number of women who marry at a late age, the Korean government should implement population and social policies to encourage married women have their first child as early as possible.

토착 미생물을 이용한 MTBE와 BTEX의 혐기성 생분해 연구

정우진,장순웅,Chung, Woo-Jin,Chang, Soon-Woong 한국지하수토양환경학회 2016 지하수토양환경 Vol.21 No.3

The simultaneous biodegradation between MTBE (Gasoline additives) and BTEX (Benzene, Toluene, Ethyl-benzene, o-Xylene, m-Xylene, p-Xylene) was achieved within a competitive inter-relationship, with not only electron accepters such as nitrate, sulfate, and iron(III) without oxygen, but also with electron donors such as MTBE and BTEX. Preexisting indigenous microorganisms from a domestic sample of gasoline contaminated soil was used for a lab-scale batch test. The result of the test showed that the biodegradation rate of MTBE decreased when there was co-existing MTBE and BTEX, compared to having just MTBE present. The growth of indigenous microorganisms was not affected in the case of the MTBE treatment, whereas the growth of the microorganisms was decreased in combined MTBE and BTEX sample. This may indicate that an inhibitor related to biodegradation when BTEX and MTBE are mixed will be found. This inhibitor may be found to retard the anaerobic conditions needed for efficient breakdown of these complex carbon chain molecules in-situ. Moreover, it is also possible that an unknown competitive reaction is being imposed on the interactions between MTBE and BTEX dependent on conditions, ratios of mixture, etc.

소아에서 human metapneumovirus와 respiratory syncytial virus에 의한 호흡기질환의 비교

정우진 ( Woo Jin Chung ),강성실 ( Sung Shil Kang ),방경원 ( Kyong Won Bang ),전윤홍 ( Yoon Hong Chun ),윤종서 ( Jong Seo Yoon ),김현희 ( Hyun Hee Kim ),김진택 ( Jin Tack Kim ),이준성 ( Joon Sung Lee ) 대한소아알레르기호흡기학회 2013 Allergy Asthma & Respiratory Disease Vol.1 No.2

Purpose: Human metapneumovirus (hMPV) is known to result in clinical manifestation similar to respiratory syncytial virus (RSV) in children. But some recent studies showed different features. This study compared the clinical manifestation of respiratory disease between hMPV and RSV. Methods: A total of 801 children who admitted to Seoul St. Mary’s Hospital for respiratory infection from January to June, 2012 were enrolled. Respiratory viral polymerase chain reaction (PCR) using nasopharyngeal swab was performed in all children. We grouped hMPV positive children and RSV positive children and compared clinical features between them by retrospective chart review. Results: Among 801 children, 365 showed one virus PCR positive with 44 showing hMPV and 41 showing RSV. Respiratory diseases were upper respiratory infection, acute bronchitis, acute bronchiolitis and pneumonia. The peak season was March and April for hMPV and February and March for RSV. Fever incidence, fever duration and neutrophil percent of complete blood cell count were higher in hMPV group than RSV group (P<0.05). The mean age of hMPV group was higher than RSV group (P<0.05). But in acute bronchiolitis children, there was no mean age difference between two group. Acute bronchiolitis incidence declined with increased age for both group (P<0.05). The hMPV group showed relatively lower bronchiolitis and higher pneumonia incidence than RSV group, suggesting relation with age. Conclusion: Respiratory infection by hMPV developed at late winter and spring, slightly later than RSV and at older age. The lower incidence of acute bronchiolitis for hMPV infection than RSV is maybe due to older age than RSV. (Allergy Asthma Respir Dis 2013;1:157-163)

확률적 사망률 예측모형에 의한 국민건강보험 진료비 장기 전망

정우진 ( Woo Jin Chung ) 한국사회보장학회 2007 사회보장연구 Vol.23 No.2

COVID-19과 간질환과의 연관

정우진 ( Woo Jin Chung ) 대한간학회 2021 Postgraduate Courses (PG) Vol.2021 No.1

Coronavirus disease 2019 (COVID-19) pandemics affected many aspects of the socioeconomic structure in Korea, especially in medical practice. As a major route of infection, the respiratory system is a key organ leading to increased risk of mortality and morbidity. However, it is well known that extra-respiratory involvement of COVID-19 also significantly affects patients’ outcomes. Patients with chronic liver disease are not at increased risk of infection with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). But, the risk of severe courses of COVID-19 may be different depending on the nature of the chronic liver disease and the presence of advanced fibrosis or cirrhosis. The present topic will summarize current evidences on the risk of infection and severe COVID-19 courses in patients with variable liver diseases.

링기어 플로팅이 유성 기어의 하중 분할에 미치는 영향

정우진 ( Woo-jin Chung ),박영준 ( Young-jun Park ),이기훈 ( Ki-hun Lee ) 한국농업기계학회 2017 한국농업기계학회 학술발표논문집 Vol.22 No.2

유성 기어의 하중 분할은 유성 기어의 크기와 수명에 영향을 미치는 중요한 설계 요인 중의 하나이다. 다양한 오차들로 인하여 유성 기어에 발생하는 불균일한 하중 분할은 기어의 수명을 감소시킨다. 본 연구의 목적은 링기어 플로팅이 유성 기어의 하중 분할에 미치는 영향을 분석하는 것이다. 분석 대상인 기어 박스는 하나의 평행축 기어 세트와 하나의 유성 기어 세트로 이루어져 있으며, 전동식 지게차의 주행 장치로 사용된다. 상용 소프트웨어인 RomaxDESIGNER를 이용하여 기어박스를 모델링하였으며, 실제 제작과 동일한 조건으로 링기어 플로팅을 구현하였다. 또한, 링기어 플로팅의 하중 분할 효과를 비교분석하기 위하여 링기어가 고정된 모델도 추가로 개발하였다. 두 모델의 비교분석 결과, 링기어 플로팅을 활용하여 유성 기어의 하중 분할이 개선될 수 있음을 확인하였다. 따라서 본 연구의 결과를 통해 링 기어를 하우징에 고정시키는 것이 아니라 플로팅 상태로 만듦으로써 유성 기어 세트의 수명을 개선시킬 수 있다는 것을 확인하였다.

헬리컬 기어의 정적 전달오차 계산을 위한 개선된 해석적 모델

정우진(Woo-Jin Chung),한현우(Hyun-Woo Han),박정호(Jung-Ho Park),박영준(Young-Jun Park) 한국자동차공학회 2020 한국자동차공학회 부문종합 학술대회 Vol.2020 No.7