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M&S 컴포넌트의 신속 개발과 재사용을 위한 프레임워크 및 도구 개발
이용헌,조규태,이승영,황근철,김세환,Lee, Yong Heon,Cho, Kyu Tae,Lee, Seung Young,Hwang, Keun Chul,Kim, Sae Hwan 한국시뮬레이션학회 2013 한국시뮬레이션학회 논문지 Vol.22 No.4
국방 M&S 분야에서 모의 기반 획득 방법이 필수적인 정책으로 인식되면서 획득 단계별 M&S 적용을 위한 협업이 필요해지고 M&S 컴포넌트를 쉽게 개발하고 공유하기 위한 공통 기반환경의 구축이 필요하게 되었다. 이를 위하여 본 연구에서는 모델 개발 재사용성 향상을 위한 형식론 기반의 시뮬레이션 프레임워크와 신속 개발을 위한 GUI 기반 모델링 환경을 제안한다. 제안하는 프레임워크는 플러그인 기반으로 동작하며 XML 기반 객체 모델을 바탕으로 하고 있기 때문에 모델의 개발과 변경에 대해 유연한 설계를 할 수 있으며 외부체계 연동, 모델 데이터 로깅과 같은 시뮬레이션 지원 기능을 구현하는데 효과적이다. 본 논문에서는 이러한 프레임워크 및 모델링 개발 도구의 구조와 기능 요소들에 대해 설명한다. Modeling and simulation technology is being used in various fields. Especially in the field of military, Simulation-Based Acquisition (SBA) is recognized as a essential policy. To effectively carry out SBA, modeling and simulation techniques should be applied in the whole life-cycle for the weapon system development, and the framework and tools which can help the rapid component development and reusability are needed. In this research, we use the simulation framework based on modeling formalism for enhancement of reusability and a GUI-based modeling environment for rapid M&S component development. The Proposed framework can act as plug-in components on the basis of XML-based object model, so that the flexible design is possible for the change of the model and simulation structure. In addition, our methods are effective to implement the functions for supporting simulation such as the model data logging and communication with external systems. In this paper, we describe an architecture and functions for the framework and tools.
원심주조방법으로 제조된 고속도강 압연롤의 미세조직과 파괴특성
이성학,이희춘,황근철 대한금속재료학회(대한금속학회) 1997 대한금속·재료학회지 Vol.35 No.12
A study was made of the effects of alloying elements on microstructural factors of nine high speed steel (HSS) rolls manufactured by centrifugal casting method. Particular emphasis was placed on the role of hard carbides located along solidification cell boundary and the type of the martensite matrix. Microstructural observation, X-ray diffraction analysis, and hardness measurement were conducted on the rolls to identify carbides. Various types of carbides mostly segregated in the intercellular regions were dependent upon alloying elements and their amount, and played an important role in overall roll hardness. The effects of alloying elements were analyzed on the basis of the liquidus surface diagram, suggesting that the proper contents of carbon, tungsten, molybdenum, chromium, and vanadium were 1.9-2.0%, 3-4%, 3-4%, 5-7%, and 5-6%, respectively.
뫼스바우어 분광분석기법을 이용한 압연롤재료의 열처리 단계별 상분석
오세진,권순주,이성학,황근철,오홍석 대한금속재료학회(대한금속학회) 1999 대한금속·재료학회지 Vol.37 No.8
The phases in a high speed steel (HSS) roll and a nickel-grain cast iron (Ni-grain) roll were quantitatively analyzed by Mo¨ssbauer spectroscopy. Particular emphasis was placed on the presence of retained austenite formed during heat treatment. Roll microstructures were examined by using Mo¨ssbauer spectroscopy as well as optical microscopy and X-ray diffraction analysis. In the HSS roll, austenite formed after austenitization disappeared after tempering. However, in the Ni-grain roll, austenite was formed during casting, and a considerable amount of austenite still remained after stress relief treatment at 450℃ for 30 min. From these results, the longer stress relief time or the higher stress relief temperature was suggested in order to remove the retained austenite in the Ni-grain roll. The Mo¨ssbauer analysis data matched well with the microstructures and the X-ray diffraction analysis data, confirming that the Mo¨ssbauer analysis is quite useful for the quantitative phase analysis of the rolls.
안상호,이성학,이언식,황근철 대한금속재료학회(대한금속학회) 1997 대한금속·재료학회지 Vol.35 No.1
The black iron oxide layers formed in the surface of two HSS rolls were investigated. The microstructural observation of the surface region of the HSS roll with more W and Mo additions indicated that microcracks were formed in the black iron oxide layers, and propagated along needle-shaped M₂C type carbides, thereby leading to the final separation of the black iron oxide layers from the roll surface. On the other hand, on the HSS roll with less W and Mo additions, the black iron oxide layers were hardly formed since they were fallen off easily from the roll surface. These results were explained by the molybdenum addition which affected the amount of M₂C carbides and the black iron oxide formation. In order to achieve the stable black iron oxide layer on the HSS roll surface, the molybdenum content should be controlled carefully.