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.

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.

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.

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.

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.

플로팅 기술이 유성기어세트의 하중 분할 개선에 미치는 영향 분석

정우진 ( Woo-jin Chung ),박영준 ( Young-jun Park ),조승제 ( Seung-je Cho ),김범수 ( Beom-soo Kim ) 한국농업기계학회 2019 한국농업기계학회 학술발표논문집 Vol.24 No.1

유성기어박스의 핵심 부품인 유성기어세트는 기어세트의 크기를 작게 하면서 큰 동력을 전달할 수 있다는 장점이 있다. 유성기어세트의 긴 수명을 위해서는 하중 분할이 균일하게 이뤄져야 한다. 이상적인 유성기어세트의 경우 각 유성기어에 동일한 하중이 가해지지만, 실제 유성기어세트에서는 제작 및 조립 오차들로 인하여 균일하지 않은 하중 분할이 발생한다. 균일하지 않은 하중 분할은 기어의 수명을 감소시키기 때문에, 유성기어세트의 긴 수명을 위해서는 하중 분할 개선이 필수적이다. 유성기어세트의 하중 분할을 개선하기 위한 방법들 중 가장 간단하면서도 보편적으로 쓰이는 방법은 플로팅(floating) 기술이다. 본 연구의 목적은 플로팅 기술을 적용하여 유성기어세트의 하중 분할을 개선하는 것이다. 플로팅 기술은 3가지의 다른 방법(선기어 플로팅, 링기어 플로팅, 선기어+링기어 플로팅)으로 적용되었다. 상용소프트웨어인 RomaxDESIGNER를 사용하여 기어박스를 모델링하였으며, 플로팅 기술 적용 방법에 따른 유성기어세트의 하중 분할 개선 차이를 확인하기 위하여 총 4개의 기어박스 모델이 개발되었다. 4개의 기어박스 모델은 플로팅 기술이 적용되지 않은 모델, 선기어 플로팅이 적용된 모델, 링기어 플로딩이 적용된 모델, 선기어 플로팅과 링기어 플로팅 모두 적용된 모델로 구성되었다. 4개의 모델을 비교분석한 결과, 플로팅 기술을 통해 유성기어세트의 하중 분할을 개선할 수 있음을 확인하였다. 또한, 유성기어세트의 구성 요소 중 단일 요소(선기어 또는 링기어)에만 플로팅 기술을 적용하는 것보다는 2개의 요소에 모두 플로팅기술을 적용하는 것이 더 큰 효과를 낳는다는 것을 확인하였다. 따라서 본 연구의 결과를 통해 플로팅 기술의 적용 방법에 따라 유성기어세트의 하중 분할 개선 정도가 다르다는 것을 확인하였다. 또한 플로팅 기술을 적용함으로써 유성기어세트의 수명을 개선시킬 수 있다는 것을 확인하였다.

인공신경망 모델을 활용한 기어 최적 설계

정우진(Woo-Jin Chung),문동주(Dong-Joo Moon),박영준(Young-Jun Park) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11

인공신경망 모델을 활용한 기어 최적 설계

정우진(Woo-Jin Chung),문동주(Dong-Joo Moon),박영준(Young-Jun Park) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11

의료수요자 중심의 통합의료모델 개발을 위한 의료전문직의 인식에 대한 연구

정우진(Chung Woo Jin),조치흠(Cho Chi Heum),임영규(Lim Young Kyu),이현지(Lee Hyun Ji) 동양사회사상학회 2016 사회사상과 문화 Vol.19 No.1

오늘날 한국의료시장에서 의료수요자의 다수는 양방과 한방을 모두 이용하는 의료서비스를 소비하고, 다수의 병의원이 양방과 한방의 협진을 실시하고 있다. 그럼에도 불구하고 양방과 한방의 통합적인 사용에 대한 의료제도와 의료정책이 미비한 관계로 의료수요자들의 혼란과 중복진료, 과잉진료의 문제를 해결하기 어려운 실정이다. 최근에는 세계적으로 의료헤게모니를 장악했던 서구의학계가 통합의학에 대한 문제의식과 필요성에 입각한 통합의학 트렌드를 주도하고 있다. 반면 양방과 한방이 독립적인 의료체계를 가지고 각각 독립적인 발전을 이룬 한국의학계는 이러한 트렌드에 대한 즉각적인 대처에 미비하다. 본 연구에서는 의료수요자 중심의 통합의료모델을 개발하기 위해서, 계명대학교 동산의료원의 의사와 간호사를 대상으로 통합의학에 대한 인식, 통합의학의 필요성, 통합의학이 필요한 질환에 대한 인식을 조사하였다. 이 조사는 양방 종합병원에 근무하는 의료전문직을 조사대상자로 제한하고 있다는 점, 조사대상자의 사례 수가 한정되어 있는 점 등의 제약이 있지만, 통합의료모델을 개발하기 위한 기초연구라는 점에서 그 의미를 가지고 있다. Nowadays many Koreans use both kinds of medical services which are Western medicine and Korean traditional medicine. And many hospitals provide integrated medical service. But medical care system and medical policy for integrated use of Western medicine and Korean traditional medicine is not completed. Therefore, confusion of medical consumer, duplicated diagnosis, and over treatment often occur. Lately Western medicine which occupies the medical hegemony leads the trend of integrated medicine. But because Western medicine and Korean traditional medicine has developed independently, it s very difficult that Korean medicine manages the new trend. In this paper, we have investigated the recognition for integrated medicine, the necessity of integrated medicine, the awareness of the diseases which need the treatment of integrated medicine to medical doctors and nurses of Keimyung Dongsan Medical Center. The purpose of research is to develop the integrated medical model which fits to the need of medical consumers. This research has some limitations like the restriction of pollee and the limited numbers of sample. But this research can be the basic work to develop the integrated medical model.

만성 C형간염의 관리와 새로운 치료법

정우진 ( Woo Jin Chung ) 대한간학회 2018 간학회 싱글토픽 심포지움 Vol.2018 No.1