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김명식,배규식,Kim, Myung-Sik,Bae, Kyoo-Sik 한국재료학회 2008 한국재료학회지 Vol.18 No.9
BGA test sockets failed earlier than the expected life-time due to abnormal signal delay, shown especially at the low temperature ($-50^{\circ}C$). Analysis of failed sockets was conducted by EDX, AES, and XRD. A SnO layer contaminated with C was found to form on the surface of socket pins. The formation of SnO layer was attributed to the repeated Sn transfer from BGA balls to pin surface and instant oxidation of fresh Sn. As a result, contact resistance increased, inducing signal delay. Abnormal signal delay at the low temperature was attributed to the increasing resistivity of Sn oxide with decreasing temperature, as manifested by the resistance measurement of $SnO_2$.
김명식,임장근,Kim, Myung-Sik,Lim, Jang-Keun 대한기계학회 1999 大韓機械學會論文集A Vol.23 No.6
For the effective analysis of two dimensional plane problems with geometrical discontinuities, singular finite element has been proposed. The element matrix equation was formulated on the basis of hybrid variational principle and Trefftz function sets derived consistently from the complex theory of plane elasticity by introducing a conformal mapping function. In order to suggest the accuracy characteristics of the proposed singular finite element, typical plane problems were analyzed and these results were compared with exact solutions. The singular finite element gives the comparatively exact values of stress concentration factors or stress intensity factors and can be effectively used for the analysis of mechanical structures containing various geometrical discontinuities.
PTFE 및 W 첨가가 Ni-P 도금의 내마모 특성에 미치는 영향
김명식,홍진원,배규식,Kim, Myung-Sik,Hong, Jin-Won,Bae, Kyoo-Sik 한국반도체디스플레이기술학회 2007 반도체디스플레이기술학회지 Vol.6 No.2
Electroless Ni-P coating is widely used for chemical, electronic, and semiconductor equipment parts because of its corrosion resistance. The incorporation of chemically-inert PTFE particles into the Ni-P films improves properties such as, non-stick, anti-adhesive and better corrosion resistance. However, soft PTFE particles degrade the hardness, wear and abrasion resistance. In this study, effects of PTFE and W addition to the Ni-P-coatings were compared by the XRD, SEM, sheet resistance, contact angle, and microhardness measurements. The change in sheet resistance was negligible, but contact angle was doubled by the addition of PTFE and W. The microhardness was lower for Ni-P-PTFE, but higher for Ni-P-PTFE-W coatings, compared to that of Ni-P coatings.
췌담도 ; 알코올성 췌장염과 간경변환자에서 알코올 대사효소와 사이토카인의 유전자 다형성
김명식 ( Kim Myeong Sig ),정석 ( Jeong Seog ),이진우 ( Lee Jin U ),권계숙 ( Kwon Gye Sug ),이돈행 ( Lee Don Haeng ),김범수 ( Kim Beom Su ),김형길 ( Kim Hyeong Gil ),신용운 ( Sin Yong Un ),김영수 ( Kim Yeong Su ) 대한소화기학회 2003 대한소화기학회 추계학술대회 Vol.2003 No.-
<목적> 만성음주에 의한 장기의 손상의 개인적 감수성의 차이는 알코올 대사효소나 사이토카인의 유전자 다형성에 의해 영향을 받을 것으로 생각된다. 이 연구는 알코올성 췌장염과 알코올성 간경변 환자에서 알코올 탈수소효소2(ADH2), 알코올 탈수소효소3 (ADH3), 알데하이드 탈수소효소2 (ALDH2), 미소체 에탄올 산화계의 사이토크롬 P450 2E1효소(CYP2E1), 4가지 사이토카인(IL-1, IL-6, IL-8, TNF-α)들의 유전자의 유전자형
알코올성 췌장염과 간경변 환자에서 알코올대사효소와 시토카인의 유전자 다형성
김명식 ( Myong Sik Kim ),이돈행 ( Don Haeng Lee ),강효승 ( Hyo Seung Kang ),박현신 ( Hyun Shin Park ),정석 ( Seok Jung ),이진우 ( Jin Woo Lee ),권계숙 ( Kye Sook Kwon ),김범수 ( Pum Soo Kim ),김형길 ( Hyung Gil Kim ),신용운 ( Yon 대한소화기학회 2004 대한소화기학회지 Vol.43 No.6
Background/Aims: Susceptibility to organ damage induced by alcohol may be related to inherited variations (polymorphisms) in alcohol-metabolizing enzymes, or polymorphisms affecting cytokines. The aim of this study was to compare the genotype and allelic frequencies of ADH2, ADH3, ALDH2, cytochrome P450-2E1, IL-1, IL-6, IL-8 and tumor necrosis factor-α in patients with alcoholic pancreatitis and alcoholic liver cirrhosis with those of controls. Methods: We determined the polymorphism of genes of the above-mentioned alcohol-metabolizing enzymes and cytokines in 29 alcoholic pancreatitis patients (AP), 22 alcoholic liver cirrhosis patients (LC) and 100 healthy blood donors (control). The genotypes were characterized by restriction fragment length polymorphism after amplification of genomic DNA by polymerase chain reaction. Results: The allelic frequency of CYP2E1*c2 was significantly different in three groups (AP: LC: Control=0.224: 0.136: 0.320, p<0.05). There was no significant difference in the other genotypes or allelic frequencies of the three groups. The allelic frequencies of CYP2E1*c2 and ALDH2*2 were more frequent in the control than patients with alcoholic liver cirrhosis (LC: Control=0.136: 0.320, p<0.05, LC: Control=0.114: 0.265, p<0.05). Allelic frequencies of ADH2 was statisitcally different between LC and control (ADH2*1; LC: Control=0.727: 0.495, ADH2*2; 0.227: 0.360, ADH2*3; 0.046: 0.145, p<0.05). Conclusions: There was no difference in the frequencies of genotype and allele of enzymes and cytokines among the three groups. However, frequency of ADH2*1 was significantly higher and those of CYP2E1*c2 and ALDH2*2 were significantly lower than LC group than control. (Korean J Gastro-enterol 2004;43:355-363)