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연소반응 합성된 TiC 분말 소결체의 미세구조에 미치는 금속 Binder 영향
김명진,박민우,전재호,한유동 慶星大學校 1998 論文集 Vol.19 No.2
TiC cermets werefabricated by sintering of TiC and metal powders produced by self propagating high temperature systhesis (SHS). A total of five different cermet systems were studied. These are TiC-Ni, TiC-Co, TiC-Fe, TiC-Al and TiC-Cu. Powders of Ti, C, and metals (Ni, Co, Fe, Cu, Al) were first reacted to form TiC carbide in the matrix of each metal by SHS. The reaction products were crushed into fine powders, which were subsequently sintered at high temperatures either in hydrogen atmosphere or in vacuum for over 1 hours. The mocrosturctural evolution of the cermets was studied including carbide particle size and shape, growth of particles, and density of sintered body. The effects of different binder metals on the mocrosturctures of the cermets are discussed.
박유영,조재훈,여명석,김광우 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1
The objective of this study is to develop the operation model of the double-skin facade for energy conservation and user comfort. This study proposes development process of the operation model in three steps. A case study is used to investigate the feasibility of the process. The G building in Kungkido is chosen. The main contents of this study are as follows. 1) The operation objectives and standards are established. And the operation factors classified according to the objectives and standards. 2) Correlation of the operation factors are clarified. And Individual models. The operation model is essential to building which has the double-skin facade and logical operation would be improved by this model. For the practical application of this operation model, it will be needed to connect the building management system.
임철수,류정호,엄명도,황진우,김예은 한국대기환경학회 2004 한국대기환경학회지 Vol.20 No.2
Diesel engines which emit a lot of PM and NOx have been known as a main air polluter. Especially, diesel particulate matters (DPM) including black smoke are hazardous air pollutants to human health and environment. The nations retaining advanced engine technologies have reinforced emission regulations. To meet these regulations diesel engine manufacturers have developed low-emission diesel engines, aftertreatment equipments, alternative fuel technologies and so on. In this study, particle number concentrations characteristics according to particle size and engine driving conditions were analyzed when these low-emission technologies were applied. There was a tendency of increasing particle number concentrations from heavy-duty diesel engines with increasing engine rpm and load rate. In the cases of CDPF (Catalytic Diesel Particulate Filter), CNG (Compressed Natural Gas) engine and ULSD (Ultra Low Sulfur Diesel) more than 99% of particle number concentration were removed.
대퇴골 간부 골절 치료에서 확공성 금속정과 비확공성 금속성 사용시 임상적 차이 비교
박희곤,김명호,유문집,변우섭 대한골절학회 2003 대한골절학회지 Vol.16 No.2
목 적: 대퇴골 간부 골절의 치료에 있어 확공성 금속정을 사용한 경우와 비확공성 금속정을 사용한 경우, 그 임상적 차이를 비교 분석해 보고자 하였다. 대상 및 방법: 1997년 6월부터 2000년 4월까지 대퇴 간부 골절로 진단, 본원에서 확공성 금속정 또는 비확공성 금속정으로 치료한 105례의 환자 중에서 1년 이상 추시 가능했던 95례의 활자를 대상으로 하였다 이중 확공성 금속정 사용군이 74례, 비확공성 사용군이 21례이였다. 골절의 분류는Winquist-Hansen 분류를 사용하였으며, 확공성 금속정을 사용한 경우는 Ⅰ형 20례, Ⅱ형 37례, Ⅲ형 15례, Ⅳ형 2례이였으며 비확공성 금속정을 사용한 경우는 Ⅰ형 0례, Ⅱ형 7례, Ⅲ형 10례, Ⅳ형 4례였다. 연구 방법으로는 연구 대상의 추시 기간 동안의 의무기록과 방사선학적 검사를 토대로 수술 시간, 수술시 출혈량, 최초 가골 형성 시기, 골절 유합 시기 및 합병증 등을 후향적으로 비교하여 통계학적 분석을 시행하였다. 결 과: 수술시간은 확공성 금속정 사용군이 평균 107분, 비확공성 금속정 사용군이 94분으로 통계학적 유의성을 보였으며 (p<0.005) 수술이 출혈량의 경우 금속정 사용군이 400㎖, 비확공성 금속정 사용군이 250 ㎖로 통계학적 유의성을 보였다 (p<0.001). 그 외 최고 가골 형성 시기나 골절 유합 시기 등에서는 통계학적 유의성이 없었으나, 골절 유합 시기가 비확공성 금속정 사용군에서 전반적으로 늦는 경향을 보였다. 결 론: 대퇴골 간부 골절 치료에 있어 비확공성 금속정을 사용한 경우가 확공성 금속정을 사용한 경우에 비해 수술 시간 및 수술시 출혈량에 있어 유리함이 통계학적으로 유의하게 나타나 제한된 경우에서는 비확공성 금속정의 사용을 고려해도 좋을 것으로 사료된다. Purpose: The comparative analysis of clinical difference between the use of reamed nail and unreamed nail in treatment of femoral shaft fracture. Materials and Methods: In 105 patients with femoral shaft fracture who were treated with reamed nail or unreamed nail between June of 1997 and April of 2000, 95 patients who underwent more than a year of follow-up were selected. Winquist-Hansen criteria was applied for the classification of fracture. Based on the medical records and radiological examinations, conducted a retrospective, statistical analysis of the duration of operation, the amount of bleeding during operation, the first time of callus formation, union time, and complications. Results: The average duration of operation was 107 minutes for reamed nail group, and 94 minutes for unreamed nail group, and the difference was statistically significant (p<0.005). The amount of bleeding during the operation was 400㎖ for reamed nail group and 250㎖ for unreamed nail group, and the difference was statistically significant (p<0.001). There was no statistical difference in the first time of callus formation and union time between the two groups but, in general union time tend to be long in unreamed nail group. Conclusion: In the treatment of femoral shaft fracture, the use of unreamed nail was shown to have an advantage over the use of reamed nail in terms of the duration of operation and the amount of bleeding. We recommend restrictive cases.