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이광민,이기원,박경덕,정준,차종한,신다미 한국신뢰성학회 2023 신뢰성응용연구 Vol.23 No.4
Purpose: Design failure mode and effect analysis (D-FMEA) in begins the early stages of design and is completed at the time when production drawings are published. However, in the case of research and development (R&D) projects for domestic ship weapon systems, it is difficult to return the design of D-FMEA results because the manufactured prototype is mounted on the warship in the force integration prototype. In addition, D-FMEA cannot be performed for all areas of a developing weapon system. Therefore, a plan to perform D-FMEA is proposed herein, including a procedure for selecting items for D-FMEA, for application on the R&D projects of domestic warship weapon systems. Methods: In this study, a procedure was proposed in consideration of regulations and guidelines and the development environment of domestic warship systems such as design and prototype production. In addition, a case in which potential defects and failure modes were prevented and managed in advance was presented by the D-FMEA implementation of the R&D projects of actual weapons systems. Results: The proposed D-FMEA target-item-selection procedure was explained, and D-FMEA analysis was performed on the selected items to derive a potential failure mode with a high risk priority number (RPN). The improved RPN was confirmed by presenting and applying a design change plan for the derived potential failure mode. Conclusion: The proposed procedure can be used to perform reliability tests for improving the potential defects identified via D-FMEA.
이광민,김진천,이재성,김영립 한국분말야금학회 2004 한국분말재료학회지 (KPMI) Vol.11 No.2
1980년대 후반부터 집중적으로 연구되어온 기계적 합금화 공정 기술은 이제 단순화합물 조성의 합금화공정 뿐 만아니라 기계화학적(Mechanochemical) 방법으로까지 진보되어 다양한 시스템으로의 응용기술로까지 발전하게 되었다 더욱이 최근 나노기술의 한고상 제조기술로서도 역할을 하게 되는 기계적 합금화 공정 기술은 21세기에 있어서도 본문에서 연급한 바와 같은 고온용 고장도 Al 합금제조 외에도 나노결정립 분말, 자성재료, 에너지전환/저장기능재료, 준결정상제어 분야로서의 무한한 응용 가능성을 기대해 볼 수 있다.
기계적 합금화 방법에 의한 Cu-C계 복합금속분말의 제조 및 미세구조 제어 특성
이광민 한국분말야금학회 1997 한국분말재료학회지 (KPMI) Vol.4 No.1
It was investigated whether mechanical alloying (MA) processing could be more effective to the formation of metallic composite powder in Cu-C system. Elemental powder mixtures of Cu-70vo1.%C were mechanically alloyed with an attritor in an argon atmosphere and microstructural evolution was examined by X-ray diffraction analysis, scanning electron microscopy and transmission electron microscopy. It has been found that even with the high volume fraction of immiscible graphite in Cu-C system, the refinement with a few ten nanometer size as well as the highly uniform distribution of copper phases have been achieved by the MA processing.