ZnO varistor의 과도전도 현상에 대한 연구

김명식 金烏工科大學校 1995 論文集 Vol.16 No.-

Transient conduction phenomena of ZnO varistors were investigated through two methods. One is the experiment and another is the computer simulation with the theory of conduction mechanism such as "Role of the hole diffusion current on the conduction mechanism in ZnO varistors". From these results, we found that the delay times of ZnO varistors are strongly affected by the electron hole generation rate in reverse biased Schottky barrier. Therefore, it is necessary to increase the electron hole generation rate for the enhancement of the response time in ZnO varistors.

수중불분리콘크리트의 강도 특성에 대한 기초적 연구

김명식,이상명,최의식 釜慶大學校 1998 釜慶大學校 論文集 Vol.3 No.2

Recently, as we see the trend of using aggregate, is widespread, that is using crushed stone as a coarse aggregate, and using sea sand as a substitute for fine aggregate. In this study, we used mixed sand (river sand : sea sand = 1:1), we changed W/C, and the amount of antiwashout underwater admixture, and the superplasticizer. We produced and cured in the air and salt water, we investigated the compressive strength, tensile strength, flexural strength of the specimens. In our results, the basis of slump flow was satisfied, pH and suspension were under the standard amount. The most effective use of antiwashout underwater admixture in quantity was 1.0%, and the rate of tensile strength and flexural strength to the compressive strength increases as the W/C increases.

공립유치원 종일제 운영의 활성화 방안

박명희,박성식 금오공과대학교 2005 論文集 Vol.26 No.-

감염된 경골 골절의 치료

박명식 全北大學校 1986 論文集 Vol.28 No.-

현대산업과 기계문명의 발달로 사지 장관골 골절양상은 개방성 또는 분쇄성인 경우가 많으며 연부조직의 손상과 골분실등이 점차증가 추세에 있다. 이러한 개방성창상을 통한 감염은 골의 불유합을 초래하여 많은 문제점을 제기하게 되며, 또한 비개방성 골절에서도 압박금속판을 사용하여 치료한 경우에는 1.8%의 감염율을 보고하였다. 저자는 본 전북대학교 정형외과학교실에 입원하여 치료 받았던 조기에 감염된 경골골절 환자 18례를 대상으로 다음과 같은 결론을 얻을수 있었다. 첫째로 전례가 남자였으며 20대가 4례로 50%를 차지하였다. 둘째로 골절의 원인은 교통사고가 16례로 대부분을 차지하였다. 셋째로 개방성골절이 15례로 83.4% 였으며 이중 9례가 type Ⅲ였다. 넷째로 감염의 원인균은 총 9례 (50%)에서 S.aureus가 검출되어 가장 많은 원인균임을 보여주었고 다음은 혼합감염이 비교적 높은 빈도를 보였다. 다섯째 견고한 고정술, 자가 해면골이식술 및 세척술의 방법으로 평균 10.2개월만에 골유합을 얻을 수 있었다. In treatment of 18 cases of infected tibia fracture that we undergone from march, 1980 to december, 1984, we use some principles of treatment, that is, rigid osteosynthesis, autogenous cancellous bone graft and irrigation system, so we obtain the good results. The conclusion are as follows: 1. All cases were men, and they occured more commonly in young adults, 9 cases (50%) were in third decade. 2. The most common cause of initial injury of infected tibia fracture was traffic accident. 3. Fifteen of 18 cases (83.4%) was open fractures and of this, 9 cases was type Ⅲ in the classiflcation of Gustilo and Anderson. 4. The most common causative organism of infected tibia fracture was S. aureus in 9 cases(50%). 5. By rigid osteosynthesis, autogenous cancellous bone graft and irrigation method, bony union was achieved at average 10.2 months.

韓國에 있어서 蘇聯硏究의 實態 및 傾向과 展望 : trends and prospects

李命植 단국대학교 미소연구소 1987 미소연구 Vol.1 No.-

Soviet studies in Korea witnessed, in the 1960’s, a continuing folw of the Soviet case, as indeed of other cases. In the 1970’s and the 1980’s it also witnessed a folw of studies of another, newer, and broader type-studies of theoretical bent concerned with the construction of general analytical models of Soviet studies. Accordingly, the purpose of this paper is to review and examine the general trends and problems of Soviet studies in Korea. In order to cahieve the purpose, the reviewer consider in three parts firstly, what was the basic motive of Soviet studies in Korea, especially in the 1960’s; secondly how Soviet studies in Korea developed during the 1970’s and the 1980’s; finally, what are the problems to study Soviet Affairs in Korea. In terms of the difficult problems to study soviet affairs in Korea, the reviewer insisted that one of the most urgent tasks confronting the field of Russian studiesin korea be the identification and preservation of the primary source materials that document the domestic and external affairs.

상수도관의 노후도에 대한 환경영향인자의 상관성 분석

정원식,이현동,김이태,유명진 대한상하수도학회 2003 상하수도학회지 Vol.17 No.2

This study is performed to evaluate the correlation of environmental factors for drinking water pipe deterioration using statistical analysis such as multiple regression, cluster analysis, discriminant analysis, and the adequacy and dependability of grouping factors used to deterioration prediction model. Results of this study are presented that high correlation related to pipe deterioration is showed not laying year of pipe but characteristic of surrounding area and analysis of chemical components. Therefore, major influence factors of pipe deterioration for types of cast iron pipe are product quality of pipe, environmental factors using pipe deterioration evaluation model is classified to 4 types such as group related to pipe body and to hydraulic & water quality, and to characteristics of surrounding area, and to trouble & discontent of customer. And the very high adequacy of group classification is represented that the applied grouping items in this study are agree to previous studies.

Polyvinylidene Fluoride의 압전성에 관한 연구

강명식 大田工業大學 1988 한밭대학교 논문집 Vol.5 No.2

The temperature characteristics of the piezoelectric constants, k, d, e, g in biaxially oriented Polyvinylidene Fluoride film poled by various conditions are studied. The piezoelectric resonance method by IRE Standard, D-E hysteresis curve, the piezoelectric output voltage by mechanical shook are measured. From the experimental results, it is concluded as follows. 1) The longitudinal piezoelectric effect is very large comparing with the transverse effect. 2) The longitudinal piezoelectric strain constant d_33 is increased with increasing the ambient temperature ranging from 0℃ to 100℃, but its stress constant e_33 is constant. 3) The temperature dependence of d_33, e_33 can be explained by the facts that the piezoelectricity in BO-PVDF film are mainly originated from the dependents of mechanical stress on spontaneous polarization arid dimensional effect. 4) It is confirmed that, in measuring the piezoelectric constants of organic piezoelectric material, the resonance method is also valid.

한국문화의 사상기반과 그 미래학적 가능성분석을 통한 제품디자인 개발요소 연구

최명식,임성철 경희대학교 디자인연구원 2005 예술· 디자인학연구 Vol.7 No.2

Recently, design needs the social foundation for the cultural identity along with national interest in them. However, the core subjects of study and development have not had access to radical design renovation because they are just tied up to morphological approaches to the traditional culture rather than proceed to essential contents of the identity. Because the creation of design is not given from the outside, but reveals itself from within, it could not be considered without approaching the culture that endlessly creates novelty. If we do not narrow down the distance of the identity, tied up to the appearance of the culture that has been produced for centuries, we cannot be guaranteed the vitality and values of design however strongly we put stress on the culture in our design. Thus, we inevitably need the study of the contents of the cultural identity and a procedure of social agreement to it in order to derive developmental elements of product design differently from the methodological studies so far. In addition to this, we try to present abstract notions required in product design through interpreting the issue of identity in the perspective of thoughts and cultural assimilation.

Monte Carlo 시뮬레이션을 이용한 이온 주입시의 점결함 분포의 계산

손명식,이준하,변기량,황호정 중앙대학교 기술과학연구소 1995 기술과학연구소 논문집 Vol.25 No.-

이온 주입시의 점결함 분포를 간접적으로 계산하기 위해 단결정 실리콘에서의 3차원 이온 주입 시뮬레이터인 TRICSI (TRansport Ions in Crystal Slilicon) Monte Carlo 코드를 확장하여 Boron 이온 주입시의 에너지와 dose에 따른 불순물(particle) 및 점결함 분포(point defect)를 계산하였다. 결함 분포는 Modified Kinchin-Pease equation을 단결정 실리콘에 적용하여 displacement damage에 의해 발생한 Frenkel Pair(vacancy-interstitial)분포를 계산하였으며 이온 주입시의 웨이퍼 온도에 의한 Frenkel Pair 소멸 효과는 고려하지 않았다. 계산 결과는 3차원 각면으로의 2차원 투영 불순물 농도로 표현하고 주입된 dose와 에너지에 다른 마스크 주입시의 에너지 및 dose 의존성 도펀트 분포와 이에 따른 damage 분포를 이해하는 데 중요한 정보가 될 것으로 기대된다. We extended our ion implantation simulator, TRICSI (TRansport lons in Crystal Slilicon) Monte Carlo(MC) code, and indirectly calculated particle and its generating point defect distributions depending on energy and dose during boron implantation into <100> single0crystal silicon. The point defect distribution of Frenkel Pair(vacancy-interstitial) was abtained by applying the modified Kinchin-Pease equation, which usually uses in MC simulation in amorphous target, to MC simulation in crystalline silicon. We did not considered the annihilation of Frenkel Pairs due to wafer temperature. The calculated results were projected onto each free-dimensional plane, presented as two-dimensional concentration profile on it. The particle concentration profile was presented with typical open mask structure. We expect that these results help understand the dopant and its generating damage distributions depending on energy and dose during boron implantation.

Surface Rolling 時 作業條件이 表面粗度에 미치는 硏究

강명순,김희남,전영식 明知大學校 産業技術硏究所 1984 産業技術硏究所論文集 Vol.3 No.-

The surface rolling method which is one of the plastic deformation processes makes good surface roughness with reduction of diameter and increase of hardness. In this study, three NACHI 6000 ZZ bearing were used for surface rolling tool on a mild steel and high carbon steel. The objective of this study is to investigate the effect of rolling on surface roughness, however the auther also observed the reduction of workpiece diameter and hardness increase of the surface. By this study the following results have been obtained with the mild steel and high carbon steel. 1. The surface roughness is affected by the factors such as elements of rolling speed, feed, and the applied force. 2. The surface roughness increased when rolling speed increased and when rolling speed is 12 m/min and feed is constant (0.36 mm/rev) the finest surface roughness has been produced for mild steel and high carbon steel. 3. When the rolling speed is fixed (12m/min from item 2), the slower the feed the better roughness has been obtained. When feed was 0.261 m/min the roughness was (0.18μRa∼0.22μRa) for mild steel and for high carbon steel when the rolling speed was 5m/min and feed was 0.36 mm/rev, the roughness of 0.39μRa∼0.42μRa has been obtained. 4. The finest surface roughness has been obtain when the applied rolling force is 0.5 Kg/mm and 0.56㎏/mm for mild steel and high carbon steel respectively.