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D.C magnetron sputter법으로 증착된 TiAlN의 중간층에 따른 특성연구
김명호,이도재,이광민,김운섭,김민기,박범수,양국현,Kim, Myoung-Ho,Lee, Doh-Jae,Lee, Kwang-Min,Kim, Woon-Sub,Kim, Min-Ki,Park, Burm-Su,Yang, Kook-Hyun 한국재료학회 2008 한국재료학회지 Vol.18 No.10
TiAlN films were deposited on WC-5Co substrates with different buffer layers by D.C. magnetron sputtering. The films were evaluated by microstructural observations and measuring of preferred orientation, hardness value, and adhesion force. As a process variable, various buffer layers were used such as TiAlN single layer, TiAlN/TiAl, TiAlN/TiN and TiAlN/CrN. TiAlN coating layer showed columnar structures which grew up at a right angle to the substrates. The thickness of the TiAlN coating layer was about $1.8{\mu}m$, which was formed for 200 minutes at $300^{\circ}$. XRD analysis showed that the preferred orientation of TiAlN layer with TiN buffer layer was (111) and (200), and the specimens of TiAlN/TiAl, TiAlN/CrN, TiAlN single layer have preferred orientation of (111), respectively. TiAlN single layer and TiAlN/TiAl showed good adhesion properties, showing an over 80N adhesion force, while TiAlN/TiN film showed approximately 13N and the TiAlN/CrN was the worst case, in which the layer was destroyed because of high internal residual stress. The value of micro vickers hardness of the TiAlN single layer, TiAlN/TiAl and TiAlN/TiN layers were 2711, 2548 and 2461 Hv, respectively.
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한국에 있어서의 학교급식개선을 위한 연구 II. 자활급식 2년간의 관찰
김명호,이원덕,김영옥,김문식,Kim, Myung-Ho,Lee, Won-Duck,Kim, Young-Ok,Kim, Moon-Shik 대한예방의학회 1976 Journal of Preventive Medicine and Public Health Vol.9 No.1
It is obvious that adequate nutrition is essential for growth and development of school children, and many elementary schools in this country have already practiced it. Therefore, it would seem apparent that the school feeding program would have a significant effect on the growth and development of school children. This paper presents a two-year experimental school-feeding program from 1973 to 1974, and attempts to evaluate its effects by before-and-after nutrition surveys conducted in two elementary schools, one experimental and the other as a control. The two schools are both located in the same county (Yongin-Kun, Kyunggi-Do), and the families of their students are presumed to share the same socio-economic level. To assess the effect of school-feeding, we measured height, weight, chest circumference and grasping power. Physical examination was done foresigns of nutritional deficiency. A stool examination for parasites and blood examinations for hemoglobin, hematocrit and serum protein were included. Analyses were done for 150 students selected randomly at the beginning of the program. These students attended the school throughout the program period. Results are as follows: 1. The amount of increase of height, weight, chest cirumference and grasping power were greater in the experimental school than in the control school, but the differences are not statistically significant. 2. Signs of vitamin deficiency decreased in both experimental and control schools during the two-year program period. 3. At the time of the 1974 post-survey, values of Hb. & Hct. revealed no significant differences between the two schools, but serum protein level was a little higher than that of general Korean rural children of the same age. 4. Infestation rate of parasites had increased in both schools during the two-year program period. 5. Each student of the two schools was classified into three major classes, according to the level of economic condition of his or her parents, namely higher, middle and lower. The results of each class of the experimental school was compared with that of the corresponding class of the control school, expecting the relative magnitude of change largest in the lower economic class of the experimental school. However, change was greatest in the middle class, still not being statistically significant. Finally, the authors concluded that the two-year period for such a program is not sufficiently long for its beneficial effects to be demonstrated and measured. As long as the growth and development of children are concerned, planning with a more distant perspective is required, as well as the development of new methods of evaluation.
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선행관계를 고려한 다중버젼을 기반 실시간 동시성 제어 기법
김명호,홍석희(Myoung Ho Kim),Seok Hee Hong 한국정보과학회 1997 정보과학회논문지(B) Vol.24 No.11
본 논문은 실시간 데이타베이스를 위한 다중버젼을 이용한 잠금 기법을 제안한다. 실시간 처리 시스템에서 사용하는 우선 순위를 기반으로 제안하는 동시성 제어 기법은 높은 우선순위를 가지는 트랜잭션을 선호하여 데이타 충돌을 해결한다. 다중버젼과 선행관계를 사용함으로써 동시성을 증가시켰을 뿐 아니라 종료시한을 초과하는 트랜잭션의 수를 줄이고자 시도하였다. 트랜잭션들 간의 직렬성 순서를 의미하는 선형관계의 사용은 불필요한 트랜잭션의 철회를 피할 뿐 아니라 시스템의 성능을 저하시키는 교착상태를 발생시키지 않게 한다. 우선순위를 고려하여 데이타 충돌을 해결하지만 낮은 우선순위의 트랜잭션이라도 종료시점에 가까운 경우 불필요하게 철회되지 않는다. 본 논문에서는 모의실험을 통하여 제안한 동시성 제어 기법의 성능을 비교 평가하였다. This paper investigates a multiversion concurrency control algorithm for real-time databases. Based on a priority cognitive algorithm commonly used in real-time processing, the proposed algorithm resolves data conflicts among transactions in favor of the urgent transactions, I,e., those with higher priority. Our algorithm increases the degree of transaction concurrency while minimizing the transactions that miss their deadlines. This is achieved by using precedence relationships and multiple versions. A precedence relationship, which implies a serialization order among conflicting transactions, is utilized to resolve data conflicts and avoid deadlocks. The algorithm dynamically determines the abortion of lower priority transactions depending on the likelihood of roll-backs and their states of execution. This leads to saving system resources by reducing unnecessry abortion of the lower priority transactions. We present the experimental results of our algorithm, comparing other real-time concurrency control algorithms. It is shown that the proposed algorithm has superior performance to several algorithms for real-time databases.
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한국(韓國) 전통(傳統)의 자연관(自然觀)과 인간관(人間觀)
김명호,Kim, Myungho 사상체질의학회 1996 사상체질의학회지 Vol.8 No.1
Culture is way of life. And a culture is based on the view of nature and humun being. Korea has many kinds of tradition. Out of them, Korean character Hangul, food and medicine have been succeeded as they were in old days. So I tried to induce Korean view of nature and human being from those traditions. The common principle induced from them is Yin-yang and five elements. Yin-yang and five elements is away to cognize nature by Korean people. That means Yin-yang is thought to be the principle of nature. Nature is what life is born or produced. And mankind is a part of nature. Thus Yin-yang and five elements works on mankind in the same way as they do on nature. Mankind is born and grows on the earth. So human body consists of four, parts of the earth, which are light, air, water and soil. It is essential for human being to maintain balance and harmony in nature with nature and as nature.
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김명호,Kim, Myeong-Ho 한국건강관리협회 1986 건강소식 Vol.10 No.7
우리나라 사람들이 여행하거나 진출하는 지역에서 만연되고 있는 질병에 대한 상식(생활사, 전염원, 면역성, 예방법)을 신문, 방송을 통해 범국민적으로 계몽활동을 전개하도록 하여야 하며, 해외에 여행 또는 근무 할 사람에 대해 현지의 환경에 대한 지도교육을 실시해야 한다.
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