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김철환,채원탁 한국강구조학회 2002 韓國鋼構造學會 論文集 Vol.14 No.5
beam of composite structure composed of the RC structure in the end part and steel structure in thecentral part were investigated during cyclic loading, in order to evaluate strength, stifness, and deformational capacity. The parameters used in this study include the amount of reinforced steel bar between the steel beam and RC structure and the existence of the sticking plate. Test results showed that all specimens had stabilized hysteresis loops. Likewise, the specimens with sticking plate had higher load-carrying capacity compared with the one without it. In addition, the stifness of the composite structure was higher than the steel structure. All specimens also showed good rotational capacity. 본 연구에서는 단부 철근콘트리트구조와 중앙부 철골구조로 이루어진 복합구조 보를 대상으로 내력 및 강성 , 변형능력을 평가하기 위해 반복재하 실험을 행하였다 . 주된 실험변수는 철근콘크리트와 철골보의 이종구조 이음부부의 응력전달을 위해 철골보에 접합되는 철근의 개수와 단부 콘크리트를 구속하여 강성을 상승시킬 목적으로 설치되는 부착판의 설치유무이다 . 실험결과 모든 실험체가 방추형의 이력 거동을 나타내며 안정된 거동을 하였으며 , 내력에 있어서는 부착판 설치 실험체의 경우가 기본형 실험체 보다 높게 나타났다 . 또한, 강성에 있어서도 단부에 부착판을 설치한 실험체가 설치하지 않은 실험체에 비하여 보다 높게 나타났으며 , 모든 실험체가 최대 내력시의 부재각이 0.03rad..
김철환 인제대학교 1999 仁濟醫學 Vol.20 No.2
Objective: The smoking rate of Korean males has been reported that it was over 70%. Smoking is the major factor causing 30% of all adults' cancers and other major diseases such as chronic obstructive lung diseases, coronary heart disease, cerebral infart, and gastric ulcers. I started this study to see the smoking rate, their nicotine dependence, and the factors related to smoking of adult men in Seoul. Methods and Materials: The survey using the pre-maid questionnaire was performed to 746 men who gathered to receive the annual Civil Defense training during the period from September 23 to 30 1998. I discarded the 68 questionnaires which was improper, and analysed 678 ones. Results: Smokers were 76.1%, ex-smokers 9.7%, and non-smokers 14.2% respectively. 46.2% of smokers replied that they tried to stop smoking but failed. 88.4% of them tried to stop smoking without any smoking cessation aids. Alcohol drinking and stress was statistically significantly associated with smoking, but education was not. Conclusion: The percentage of smokers were 76.1%. The higher was nicotine dependence, the more they smoked and drank, but the less they tried to stop smoking.