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Cu<SUB>54</SUB>Ni<SUB>6</SUB>Zr<SUB>22</SUB>Ti<SUB>18</SUB> 벌크비정질 합금의 Nd:YAG 레이저 점용접 특성
김종현(J. H. Kim),이제훈(J. H. Lee),신승용(S. Y. Shin),배정찬(J.C. Bae),이창희(C. H. Lee) 한국레이저가공학회 2005 한국레이저가공학회지 Vol.8 No.2
Weldability is largely dependent on the phase evolution and the microstructure of the weld. For the weld ability of the Cu<SUB>54</SUB>Ni<SUB>6</SUB>Zr<SUB>22</SUB>Ti<SUB>18</SUB> bulk metallic glass, the crystallization affects the sensitivity of the weld to the brittle failure.<BR> In order to suppress the irreversible crystallization, Nd:YAG laser welding was chosen. The pulsed Nd:YAG laser was irradiated onto the BMG plate and the effects of the pulse shape [peak power intensity and pulse duration time] on the crystallinity were evaluated.
Fe계 연자성 합금 분말의 고온 압연시 자성특성에 미치는 압연인자들의 영향
김휘준(H. J. Kim),이주호(J. H. Lee),이성호(S. H. Lee),박은수(E. S. Park),허무영(M. Y. Huh),배정찬(J. C. Bae) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.5
Iron-based soft magnetic materials are widely used as cores, such as transformer transformers, motors, and generators. Reducing losses generated from soft magnetic materials of these applications results in improving energy conversion efficiency. Recently, the new P/M soft magnetic material realized an energy loss of 68 W/kg with a drive magnetic flux of 1 T, at a frequency of 1 kHz, rivaling general-purpose electromagnetic steel sheet in the low frequency range of 200 Hz to 1 kHz. In this research, the effect of rolling parameters on soft magnetic properties of Fe-based powder cores was investigated. The Fe-based soft magnetic plates were produced by the hot powder rolling process after both pure Fe and Fe-4%Si powders were canned, evacuated, and sealed in Cu can. The soft magnetic properties such as energy loss and coercive power were measured by B-H curve analyzer. The soft magnetic properties of rolled sheets were measured under conditions of a magnetic flux density of 1 T at a frequency of 200 kHz. It was found that rolling reduction ratio is the most effective parameter on reducing both energy loss and coercivity because of increasing aspect ratio with reduction ratio. By increasing aspect ratio from 1 to 9 through hot rolling of pure Fe powder, a significant loss reduction of one-third that of SPS sample was achieved.
$Cu_{54}Ni_{6}Zr_{22}Ti_{18}$ 벌크비정질 합금의 Nd:YAG 레이저 점용접 특성
김종현,이제훈,신승용,배정찬,이창희,Kim, J.H.,Lee, J.H.,Shin, S.Y.,Bae, J.C.,Lee, C.H. 한국레이저가공학회 2005 한국레이저가공학회지 Vol.8 No.2
Weldability is largely dependent on the phase evolution and the microstructure of the weld. For the weldability of the $Cu_{54}Ni_6Zr_{22}Ti_{18}$ bulk metallic glass, the crystallization affects the sensitivity of the weld to the brittle failure. In order to suppress the irreversible crystallization, Nd:YAG laser welding was chosen. The pulsed Nd:YAG laser was irradiated onto the BMG plate and the effects of the pulse shape [peak power intensity and pulse duration time] on the crystallinity were evaluated.
백련초 (Opuntia ficus-indica var., saboten)의 Salmonella와 Escherichia coli O157 : H7에 대한 항균효과
김소현,권남훈,김지연,임지연,배원기,김준만,노경민,허진,정우경,박건택,이종은,라정찬,박용호,Kim, So-Hyun,Kwon, Nam-Hoon,Kim, J.Y.,Lim, J.Y.,Bae, W.K.,Kim, J.M.,Noh, K.M.,Hur, J.,Jung, W.K.,Park, K.T.,Lee, J.E.,Ra, J.C.,Park, Yong-Ho 한국식품위생안전성학회 2002 한국식품위생안전성학회지 Vol.17 No.2
항생제 및 항균 물질 등의 오, 남용으로 인하여 항생제 내성균들이 등장, 사회적으로 큰 문제가 되고 있으며, 최근에는 식물이나 probiotics 등과 같이 항생제를 대체할 수 있는 물질에 대한 연구가 활발히 진행되고 있다. 이에 본 연구에서는 국내에서 오래 전부터 민간 요법으로 사용되어 오던 백련초 (Opuntia ficus-indica var. saboten)를 이용하여 in vitro와 in vivo에서 Salmonella enteyica serova. Enteritidis (S. enteritidis), S. enterica serova. Typhimurium (S. Typhimurium) DT104 및 Escherichia coli O157:H7에 대한 항균능을 평가하였다 백련초의 수용액이 포함된 Moulter Hinton agar에 Salmonella spp. 및 S. coli O157:H7를 접종한 결과 이들 균에 대한 억제능(inhibitory activity)을 확인할 수 있었다. 백련초 제제를 경구투여한 군에서 분변으로 배출되는 S.typhimurium DT104의 수가 급격히 감소하였고, 낀 후에는 더 이상 분변으로 균이 배출되지 않았으며, intestinal IgA가 유의적으로 증가함이 확인되었다. 본 연구를 통하여 백련초가 in vitro에서 S. enteritis, S. Typhimurium DT104와 E. coli O157:H7대한 항균력을 나타낼 뿐만 아니라 마우스의 gastrointestinal tract에서 역시 Salmonella에 대한 항균력을 보임을 확인할 수 있었다. 본 연구를 통해 백련초 및 그 성분을 이용한 병원성 세균의 제거 및 면역 증진 효과 등과 같은 연구의 필요성이 확인되었고, 그 응용 가능성도 매우 높을 것으로 사료된다. With the incidence of antibiotic resistant bacteria there is increasing interest in natural products such as herb extract and probiotics to control antibiotic resistant bacteria. This study was focused on the determination of antimicrobial activity of Opuntia ficus-indica var. saboten against Salmonella enetrica serovar Enteritidis (S. enterifidis), S. enterica serovar Typhimurium (S. Typhimurium) DT 104 and Escherichia coli 0157:H7. Though bactericidal effect of 0. ficus-indica var. saboten was not observed, it had significant inhibitory activity against Salmonella spp. and E. coli O157:H7 on the Moulter Hinton agar containing its solution dissolved in deionized water. To investigate the antimicrobial activity in vivo, mice were challenged with 5. Typhimurium DT104 (3.7$\times$108 cfu/mouse) after pre-feeding 0. ficus-indica var. saboten solution. The fecal shedding of S. Typhimurium DT104 was more dramatically decreased and not detectable in feces and intestines 3 days after challenge in mice fed with 0. ficus-indica var. saboten. Antibody responses of the intestinal IgA were also significantly increased in mice fed with 0. ficus-indica var. saboten. These findings suggest that Opuntia ficus-indica var. saboten decreased the shedding of S. Typhimurium DT104 in vitro and also in the gastrointestinal tract in mice. In addition, administration of the product might enhance the mucosal immune response against S. Typhimurium DT 104. In conclusion, Opuntia ficus-indica var. saboten might be useful to control antibiotic resistant bacteria in vivo and in vitro.
알루미늄 5052 합금 판재의 이형 압연 시 변형률 상태에 미치는 윤활의 영향
박은수(E. S. Park),황규철(K. C. Hwang),허무영(M. Y. Huh),김휘준(H. J. Kim),배정찬(J. C. Bae) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.5
In order to investigate the effect of strain states attributed to the lubrication during shape rolling, shape rolling for V-sectioned sheets was carried out with and without lubrication. The evolution of strain states during shape rolling was studied by three-dimensional finite element method (FEM). Shape rolling with and without lubrication produces shape-rolled samples in fairly similar outer shapes, since the distribution of normal strain components is nearly independent of the lubrication condition. In contrast, the distribution of shear strain components strongly depends on the lubrication condition.