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부산지역 조선업 용접공들의 진폐증에 관한 역학적 조사연구
이채언,이종태,손혜숙,김성천,배기택,박형종,김용완,윤임중,Lee, C.U.,Lee, Jong-Tae,Shon, H.S.,Kim, S.C.,Pae, K.T.,Park, H.J.,Kim, Y.W.,Yun, I.G. 대한예방의학회 1989 Journal of Preventive Medicine and Public Health Vol.22 No.1
Authors studied on the prevalence of 94 cases of pneumoconiosis who were found out through the screening test on 1,062 workers engaged in welding process at 36 shipyard in Pusan area from March 1st, 1986 to November 30th, 1986. The result were as follows; 1. Dust concentration was measured $4.49{\pm}0.54mg/m^3$ in the small scale shipyard while it was $6.25{\pm}1.08mg/m^3$ in the large one. 2. The prevalence of welder's lung was 8.9% (male:8.5%, female:12.0%) and this is consist of 4.9% suspected pneumoconiosis and 4.0% pneumoconiosis more than category 1/0. 3. The prevalence was significantly increased according to the duration of dust exposure(p<0.05), and it showed the increasing tendency by the age group. 4. The prevalence was significantly higher in the large scale shipyard than is the small scale one(p<0.01). 5. The type and shape of opacities were 71.4% of p type and 28.6% of q type, however no pneumoconiosis with r type observed in this study. 6. The main subjective symptoms were the sputum(29.8%), coughing(25.5%), shortness of breath(20.2%), fatique(6.4%), and chest pain(5.3%). In other hand, 57.4% of pneumoconiosis were asymptomatic. 7. The prevalence of pulmonary tuberculosis was radiologically 1.7% in all subjects including 5.3% in pneumoconiosis and 1.3% in no pneumoconiosis(p<0.01).
김용태(YOUNG T. KIM),정찬운(CHAN M. CHUNG),정대용(D.Y. JEONG),이종태(JONG T. LEE) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.5_1
A medium duty hydrogen-natural gas fueled engine using hydrogen enriched CNG fuel can obtain stable operation at ultra lean condition and reduce emissions extremely. Reduction of CO₂in its engine is the one of most benefit. In this study, compression ratio were investigated including performance of this engine. As results, it was found that phenomenon of pressure oscillation it means occurring knock was increased due to large specific volume of hydrogen when R_(dH2) was increased. Even if same compression ratio, pressure oscillation was remarkable according to increasing R_(dH2).