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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.
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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 $SnO_2$.
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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.
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김명식(Kim Myung-Sik) 한국과학기술학회 2001 과학기술학연구 Vol.1 No.1
이 글은 1999년 유네스코 한국위원회가 개최한 제 2차 생명복제 합의회의를 다룬다. 기존의 연구는 합의회의를 시민참여모델의 일환으로만 이해했고, 그것이 갖고 있는 심의민주주의적 측면을 다루지 못했다. 이 글은 시민들이 합의회의에 참여해 중요한 사회적 쟁점을 토론이라는 형식을 통해서 다루었다는 점에 주목한다. 합의회의는 시민의 공적인 판단에 기초한다는 점에서 선호취합적 민주주의와는 다르다. 이번 합의 회의는 한국에서 있었던 최초의 심의민주주의의 실험이라는 점에서 역사적 의의를 갖는다. 1) 우선 합의회의의 토대를 살펴본다. 그것은 과학의 사회구성주의, 사회적 토론의 전통, 심의민주주의다. 2) 심의민주주의가 무엇인지 살펴본다. 그것은 사적 선호가 아니라 공적 판단에 기초한다는 점에서 기존의 선호취합적 민주주의모델과 구별된다. 3) 이번 합의회의에서 실험된 심의민주주의의 특징과 의미를 살펴본다. 합의회의에서 시민들은 심의과정의 결과로 자신들의 선호를 변화시키고, 공동체적 사유로 발전하는 모습이 관찰되었다. 이는 심의민주주의의 의미를 확인해주는 것이다. 동시에 이번 합의회의는 심의민주주의의 문제점과 개선점을 확인하는 계기이기도 하다. 우선 시민패널과 전문가패널 간의 위계뿐만 아니라, 토론능력과 관련해 시민패널간의 위계가 발견되었다는 점이다. 둘째, 생명의 가치를 논증이나 담론의 형식으로 표현하기가 쉽지 않다는 점이다. 셋째, 생명복제가 미래세대 및 자연과 관련된다는 점에서 이들을 배려하는 제도적 노력이 요구된다는 점이다. This article addresses the 2nd Korean consensus conference on cloning that was held by the Korean National commission for UNESCO in 1999. Though previous perspectives recognized the conference as a new citizen's participatory institution. they do not consider that it contains the ideal of deliberative democracy. This article notes that the citizens participated directly and handled the important social agenda through debate in the consensus conference. The consensus conference is another democratic form derived from preference aggregating democracy in the sense that it basically depends on public judgement of the citizens. This consensus conference has the historical meaning because it is in fact the first experiment of deliberative democracy in Korea. 1) We examine the theoretical foundations of consensus conference. They are social constructionism of science, the tradition of societal debate, and deliberative democracy. 2) We explore what deliberative democracy is. It is different from aggregating preference democracy in the sense that it depends on public judgement rather than private preferences. 3) We investigate the features and meaning of deliberative democracy which has experiment on the conference. In the Consensus Conference it was observed that citizens changed their preferences and went forward to developing their view of community as a result of the process of deliberation. It can be said to confirm the significance of deliberative democracy. However, it is simultaneously an opportunity to clarify some problems of deliberative democracy. First of all, it shows that there were hierarchies within the citizens' panel as well as between the citizens' and the specialists' panels. Secondly, there are difficulties in expressing the value of life in argument or discourse. Also, we need the institutional efforts concerning future generations and nonhuman beings in the respect that cloning relates to them.
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CORE-Dedup: 내용보존 접근 지역성 활용한 IO 크기 분할 기반 중복제거
김명식(Myung-Sik Kim),원유집(You-Jip Won) 한국컴퓨터정보학회 2015 韓國컴퓨터情報學會論文誌 Vol.20 No.6
고성능 내장형 기기의 대중화 및 광대역 통신기술의 발달로 생성-관리되는 데이터가 증가하고 있다. 중복제거 기법은 중복된 저장 요청을 판별하여 유일한 데이터만을 저장함으로써 저장 공간을 절약하는 방법으로 폭증하는 데이터의 저장과 처리 시스템을 경제적으로 구축 할 수 있다. 본 연구는 입출력 크기 (IO Extent) 단위 기반 분할 방법을 사용한 CORE-Dedup을 제안한다. CORE-Dedup의 Extent 단위 분할은 접근한 Content가 보존하는 접근 단위의 속성을 활용 한다. 가상머신에서 IO 경향을 수집하고 고정 크기 분할과 새로운 Extent 분할 방법에 대해 중복제거 성능을 비교 평가하였다. 동일 크기 워크로드 경우 4 KB 고정 분할 대비 적은 색인 버퍼를 가지고 유사한 수준의 중복 비교를 성능을 얻을 수 있다. 특히 다수 유저의 유사 IO 중복 접근을 가정한 워크로드 경우에는 CORE-Dedup이 Extent 단위 분할의 넓은 워크로드 Coverage에 의해 고정 크기 분할을 사용한 동일 조건의 Inline-Dedup에 비해 1/10 수준 버퍼를 가지고도 유사 중복제거 성능을 얻었다. 10명 사용자의 동일 compile 입출력을 가정한 병합 워크로드에서 4 KB 고정 크기 분할에서는 14,500개 분할 색인에서 최대 60.4%의 중복 발견율을 얻었으나 Extent 분할에서는 1,700개 색인만으로 57.6%를 얻었다. Recent wide spread of embedded devices and technology growth of broadband communication has led to rapid increase in the volume of created and managed data. As a result, data centers have to increase the storage capacity cost-effectively to store the created data. Data deduplication is one way to save the storage space by removing redundant data. This work propose IO extent based deduplication schemes called CORE-Dedup that exploits content-preserving access locality. We acquire IO traces from block device layer in virtual machine host, and compare the deduplication performance of chunking method between the fixed size and IO extent based. At multiple workload of 10 user’s compile in virtual machine environment, the result shows that 4 KB fixed size chunking and IO extent based chunking use chunk index 14500 and 1700, respectively. The deduplication rate account for 60.4% and 57.6% on fixed size and IO extent chunking, respectively.
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매입형 히트파이프를 이용한 매스콘크리트 수화열 분산 효과
김명식(Myung-Sik Kim),염치선(Chi-Sun Youm),백동일(Dong-Il Baek) 한국해양공학회 2009 韓國海洋工學會誌 Vol.23 No.4
Although most of existing hydration heat control methods show a certain degree of hydration heat control, generally, there are many problems as mentioned above. Therefore, our laboratory previously developed a hydration heat control method using an exposed heat pipe, which solves most of these problems and simultaneously displays excellent hydration heat control. Unfortunately, even this method had some problems such as the processing, transport, and assembly of heat pipes, and the surface treatment of a cut plane after pouring, and hardening concrete. Therefore, in this study, a hydration heat control method using an embedded pipe has been developed with the expectation that this method solves those problems in hydration heat control using an exposed heat pipe. As a result of the experiment, the peak temperature of ECHP and ICHP specimen about 4.5~6.5℃ than the OPC specimen and the probability of thermal cracked generated in ECHP and ICHP specimen decreased up to 13~20%. Finally, it was confirmed in this study that the hydration heat control method using an embedded heat pipe is significantly more superior and cost effective than the existing method of an exposed one.
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