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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.
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 $SnO_2$.
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.
김명식(Myung-Sik Kim) 한국철학회 2007 철학 Vol.92 No.-
이글은 심의이론의 관점에서 동물실험 문제를 다룬다. 우선 동물실험 논쟁을 개괄한 다음, 심의민주주의의 주요 이론가인 하버마스와 롤즈 입장에서 바라본 동물의 지위 문제를 디룬다. 이를 통해 심의이론의 특정을 파악한다. 동물도 인간과 마찬가지로 쾌락과 고통을 느끼고, 고등동물의 경우 자기의식 수준의 지각능력을 갖고 있다는 사실은 중요하다. 그래서 동물은 단순한 무생물괴는 다른 대접을 받아야 한다. 하지만 레건과 싱어의 요구는 과도하다. 현실적으로 동물의 내재적 가치를 존중하거나, 이익평둥고려의 원칙을 적용하는 문명은 불가능하기 때문이다. 또한 하버마스와 롤즈가 주장하듯이 도덕은 어디까지나 인간들의 사회적 협력을 위한 하나의 구성물이라는 점을 간과할 수 없다. 레건과 싱어의 입장을 극단적으로 밀고 갈 경우 그것은 ‘우리는 왜 도덕적이어야 하는가’라는 ‘도덕의 실천 동기’와 관련해 심각한 난관에 봉착한다. 동물은 인간을 위해 존재하는 단순한 수단이 아니지만, 동시에 우리가 같은 種으로서, 그리고 같은 사회를 구성하는 구성원으로서 인간을 다른 종과 구별하는 것은 잘못되었다고 할 수 없다. 동물에 대한 배려는 인류의 생존과 문명의 발전이 병행되는 수준에서 이루어져야 한다. 이런 맥락에서 우리는 동물실험을 되도록이면 삼가야 하지만 대안이 없을 경우 동물실험은 정당화된다. 이 경우에도 동물의 고통을 최소화하도록 노력해야 한다. 이 글은 점점 일반화되는 추세인 3R,즉 감소(reduction) 개선(refinement) 대체(replacement) 대안법에 찬성한다. This article deals with animal experiment in terms of deliberative theory. Firstly, it outlines the arguments for and against animal experiment, and then examines the moral standing of animals in views of Habermas and Rawls who are outstanding theorists in the camp of deliberative democracy. In doing so, we expect that we catch the implicit features of deliberative theory. It is important that animals as well as humans are sentient beings and higher animals have the ability of self-consciousness. Animals should be treated differently from inanimate beings. However, Regan and Singer overemphasize the standing of animals. In reality, it is impossible for us to respect the inherent worth of animals and to put the principle of equal consideration of interests into practice. As Habermas and Rawls see, morality is only the social constructions which humans make for social cooperation. We meet the dilemma around moral motivation, "Why should we be moral?", if we adhere to the principles of Regan and Singer in the extreme. Animals are not instrumental beings for human and at the same time, it is not wrong of us to discriminate against animals on the ground of species. We should respect animals at the level of which we can secure our survival and the development of our civilization. In this context, we should avoid animal experiment as possible, but it can be justifiable unless we have any alternative. In this case, we should make efforts to reduce the suffering of animals. We agree to 3R principles: reduction, refinement, and replacement.
AMESim을 이용한 Multi Step Transmission용 오일펌프 해석에 관한 연구
김명식(Myung Sik Kim),정원지(Won Jee Chung),박수성(Su Seong Park) 한국생산제조학회 2010 한국공작기계학회 추계학술대회논문집 Vol.2010 No.-
Oil pump is necessary that the transmission and engine system to improve the performance. This paper is a preliminary study about trochoid oil pump (inlet and outlet) chamber for the optimization of the shape. Changes in a volume of cavity is induced by considering leakage, modeling a working plan the hydraulic circuit recognizes the operating characteristics of the oil pump. Under this paper for increasing efficiency and reducing the pressure in pumping to conduct research.