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탄소강 후판용접부의 피로수명 및 잔류응력에 미치는 열처리 영향
안익태 ( I. T. An ),김원태 ( W. T. Kim ),조종래 ( J. R. Jo ),문영훈 ( Y. H. Moon ) 한국열처리공학회 2003 熱處理工學會誌 Vol.16 No.3
N/A The effects of heat treatment on the fatigue life and welding residual stress of welded plates were investigated in this study. The plates were welded by flux cored are welding process, and post weld heat treated at 600℃ for 1 hour. The residual stresses of welded plates before and after post weld heat treatment were measured by hole drilling method. To measure the fatigue life of welded plates, low cycle fatigue tests under strain control and high cycle fatigue tests under load control were performed respectively, by using cylindrical specimens containing weld metal and heat affected zone. The obtained result shows that the post weld heat treatment reduces the residual stress, and resultantly changes the fatigue life of welded plate. Goodman diagrammatic analysis has also been performed to study the effect of post weld heat treatment on the high cycle fatigue life.
HBsAg에 오염된 혈액검체에 대한 化學的 消毒劑의 效果에 關한 硏究
함건주,이정녀,조종래,노상옥,김공현 인제대학교 1993 仁濟醫學 Vol.14 No.1
병원에서 각종 진단 목적에 이용되는 환자의 혈액 검체 내에는 세균, 바이러스 등의 병원성 미생물에 감염된 것이 많다. 따라서 본 실험은 검사를 마친 이들 검체의 대부분이 적절한 살균 조작을 거치지 않음으로써 유발될 수 있는 환경오염이나 질병의 전파 등 보건위생상 중대한 문제를 예방하고자 B형 간염 항원 양성 혈장을 사용하여 여러가지 소독제의 바이러스에 대한 불활성화 능력을 방사 면역 측정법(Radioimmunoassay, RIA)으로 측정하였다. 실험 결과는 반응 시간 7시간인 경우 2% 농도에서 benzalkonium chloride가 98.6%로 가장 높았고, glutarldehyde는 92.3%, MLDGH는 88.6%였으며, NaOCl은 68.8%의 순서로 나타났다. 따라서 2% benzalkonium chloride를 사용하는 것이 가장 효과적인 것으로 평가되었다. Contaminated blood with microorganism and virus is put into the environment without any discontamination treatment. It may give rise to a serious health and sanitation problems and also to a threat of spreading infectious disease. In order to select the appropriate disinfectant and disinfection procedure, the teats performed in vitro via artificially contaminated blood with hepatitis B surface antigen(HBs Ag) positive plasma using several disinfectants commonly used in hospitals. The tested disinfectants were sodium hypochlorite(NaOCL), sodium dichloroisocyanurate(NaDCC), ethyl alcohol(EtOH), povidon iodine, cresol soap, benzalkonium chloride, mono-laurel-di(aminoethyl)-glycin HCI(MLDGH) and glutaraldehyde. The HBs Ag inactivation study was performed using the Radioimmunoassay(RIA) method. The results were as follows ; The inactivation effect on the HBs Ag of the benzalkonium chloride, glutaraldehyde, MLDGH, and NaOCL was 98.6%. 92.3%, 88.6% and 68.8% with in 5 hours after disinfection on the same 2% concentration, respectively. In conclusion, this study provided useful information for the 2% benalkonium chloride is the best disinfectants in consideration of the chemical stability, economy, and sanitation.