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韓國 妊婦의 TORC H病原體에 關한 抗體 保有에 關한 硏究
柳承一,金善行,洪性鳳 고려대학교 의과대학 1985 고려대 의대 잡지 Vol.22 No.3
During the recent 15 years, there was a significant changes in the incidence of viral infection in pregnancy. In addition, TORCH agents are the most prevalent microbes among them, and their infections during pregnancy, either primary or recurrent, may affect the feauses in utero and the neonates at the time of delivery. Although we have achieved some progress in controlling them in the view point of prevention and treatment, but it is still insufficient. The purpose of this study is to determine the baseline prevalence of antibodies for TORCH agents during various stage of pregnancy in Seoul, Korea. From 92 asymptomatic pregnant women, 92 single serum sample were taken and examined the antibodies for TORCH agents by ELISA (C.M.V., R.V., H.S.V.) and H.A.I. test (Toxoplasmosis). The followings are the results. 1. The prevalences of antibodies to each of the TORCH agent were 1.08% for toxoplasma, 93.47% for C.M.V., 71.73% for R.V. and 84.74% for H.S.V. 2. The prevalences of antibodies for C.M.V. and R.V. were much higher in the term pregnancy group compared to early pregnancy. This findings suggest some evidence of vulnerability to viral infection during pregnacy. 3. The prevalences of C.M.V., R.V. and H.S.V. antibodies were in parallelism with the increasing age of women. Almost all women over 30-35 years had C.M,V., R.V., H.S.V. antibodies. 4. In multiparous women, the prevalences of antibodies for TORCH agents were higher than that in nulliparous women. 5. In the women with history of previous fetal wastage, the prevalence of TORCH antibodies were higher especially for C.M.V. compared with women without past history of previous fetal wastage.
최병호,유봉선,박원욱,박익민 대한금속재료학회 2004 대한금속·재료학회지 Vol.42 No.8
The effects of Ca addition on the liquid oxidation behaviors of AZ91 alloys have been investigated. The oxide layers formed on the molten Ca-containing AZ91 alloys were investigated by using scanning electron microscope and Auger electron spectroscopy in order to elucidate the effect of Ca additions on the ignition and burning of the molten alloys. The thermogravimetric measurements indicated that Ca-containing AZ91 alloys have good oxidation resistance. AES depth analysis revealed that the oxide layers on the molten Ca-containing AZ91 alloys consisted of several layers; the outer layer mainly consisted of CaO and the inner layer was mainly a mixture of CaO-MgO and Al₂O₃. The formation of protective CaO in the oxide layer was directly responsible for improved oxidation resistance of the Ca-containing AZ91 alloys.
김일수,김학형,조선영,강봉용,강문진,유관종 한국공작기계학회 2004 한국공작기계학회 춘계학술대회논문집 Vol.2004 No.-
Over the last few years, there has been a growing interest in quantitative representation of the weld pools in order to relate the processing conditions to the driving forces of the weldment produced and to use this information for the optimization of the welding process. A theoretical model offers a powerful alternative to check the physical concepts of the welding process and the effects of driving forces. To solve this problem, a 2-D thermo-fluid model were developed for determining temperature and velocity distribution for the GMA welding process.
Solidification of AZ31 magnesium alloy plate in a horizontal continuous casting process
You, Bong Sun,Yim, Chang Dong,Kim, Su Hyeon Elsevier 2005 Materials science & engineering. properties, micro Vol.413 No.-
<P><B>Abstract</B></P><P>Magnesium plate of 120mm width and 30mm thickness was produced by horizontal continuous casting, and its microstructures were analyzed on the surface and in the plate interior. The defect formation on the surface and subsurface, such as side cracks, buckling, pores and segregation, was very sensitive to the casting condition and processing parameters. Especially, a secondary cooling was effective in refining the microstructure and controlling the grain size distribution across the plate thickness, which means that the cooling rate and curvature of the solid/liquid interface in the mold changed. According to AES analysis on the surface, the thickness of the oxide layer was not more than 0.3μm. However, the cyclic marks on the surface were obvious, because the plate were drawn by four-step cycle. In the case of several defects, they caused side cracks during rolling and survived even after rolling. Thus, it was concluded that pretreatment of the as-cast plate, such as homogenization and surface machining, is necessary to produce sound thin sheet by hot rolling.</P>
도시철도 근로자 직종별 산업재해 현황 분석 및 개선방안
지유선(You sun Ji),정성봉(seong bong Jeong) 한국철도학회 2017 한국철도학회 학술발표대회논문집 Vol.2017 No.05
2014년도 서울 수도권 교통지표를 살펴보면 대중교통이 전체 수송률의 66%이며 이중 도시철도는 39%를 차지하고 있다. 대중교통수송분담률은 전반적으로 증가하는 추세에 있고, 도시철도에 대한 이용도가 높아지면서 고장 및 사고 사례도 증가하고 있다. 도시철도의 안전한 운행을 위해서는 업무를 수행하는 근로자의 건강권 확보와 산업재해 예방이 무엇보다 중요하다. 본 연구에서는 도시철도에 종사하는 근로자들의 건강권 확보와 산업재해를 예방하기 위해 도시철도 근로자의 직종별 산업재해 현황과 소속별 현황을 살펴보고 개선방안에 대해 고찰하고자 한다. According to traffic metrics in the Seoul metropolitan area in FY 2014, public transportation accounts for 66% of the total transportation and double urban railways account for 39%. The number of cases of breakdowns and accidents is increasing as the use of urban railways increases and there is no better way to ensure the health rights of workers who work for the safe operation of urban railways and the prevention of labor accidents In this study, in order to secure the health rights of workers who work on urban railways and to prevent work-related accidents, it is necessary to look at the current state of work-related disasters by occupational categories of urban railway workers, I would like to consider this.