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임베디드 소프트웨어 결함 추적을 위한 효율적인 Record and Replay 기법 개발
김우종 ( Woojong Kim ),유민수 ( Minsoo Ryu ) 한국정보처리학회 2008 한국정보처리학회 학술대회논문집 Vol.15 No.1
임베디드 시스템이 소형화되면서도 많은 기능들이 요구됨에 따라 여기에 올라가는 임베디드 소프트웨어 역시 점점 복잡해지고 있다. 특히 멀티 쓰레드 환경에서 수행되는 임베디드 소프트웨어의 경우, 실행도중 오류가 발생했을 때 버그의 원인을 찾기가 어려울 뿐 아니라, 버그를 재현하는 것 또한 쉽지 않다. 효과적인 디버깅을 하기 위해서는 프로그램 실행 중에 버그가 발생했던 상황을 그대로 재현해야 한다. 본 논문에서는 프로그램이 실행하는 도중에 이벤트가 발생하는 시점의 이벤트정보를 record 하고, 나중에 이를 이용하여 버그가 발생한 시점으로 replay 할 수 있는 기법을 개발하였다. VPOS[1] 에 이 기법을 적용함으로써 임베디드 소프트웨어의 결함을 좀더 쉽게 탐지하여 효율적인 디버깅이 가능하도록 하였다.
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배지윤(Bae, Jiyoon),이경선(Lee, Kyung-Sun),김우종(Kim, Woojong) 대한건축학회 2018 대한건축학회논문집 Vol.34 No.10
Currently, the way of providing housing in Korea has been regarded as public rental housing through large-scale development by the government. However, there is an increasing need for qualitative growth not only in quantitative growth but also in policies, systems, and sustainable design. The purpose of this study is to explore the applicable methods for domestic social housing through the policy and design guideline study of UK social housing which has achieved qualitative growth through diversification of development subject. First, the concept of social housing in the UK and sustainable housing design elements will be examined. Second, the characteristics and policy direction, project background, management and sustainability of five social housing projects over the last 10 years in the UK will be analyzed. In conclusion, in order to achieve the sustainable design of social housing, the construction of the social housing in terms of policy and environment must include safe and eco-friendly design adaptability that can secure local identity and respond flexibly to social change. In addition, the social housing in the UK, which forms a sustainable complex through cooperation between the public and the private sector based on its place and history, can be a guideline for establishing policies and design guidelines in terms of urban regeneration.
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금속 적층제조된 대형 실린더 부품의 열변형에 미치는 적층 높이 및 재료 특성 영향에 관한 해석
이슬비(Seulbi Lee),방태양(Tae Yang Bang),김우종(Woojong Kim),강민철(Mincheol Kang),최윤석(Yoon Suk Choi) 대한용접·접합학회 2021 대한용접·접합학회지 Vol.39 No.3
The laser powder bed fusion technique involves depositing layers by selectively melting a material. This leads to rapid melting and solidification, followed by repeated reheating and remelting. The complex thermal hysteresis and resultant thermal gradient inevitably cause thermal stress and distortion in additively manufactured products. The thermal stress and distortion lead to dimensional inaccuracies, defects such as delamination and cracking, and finally, adverse effects on the product life. In this study, a thermomechanical analysis of a large cylinder (hollow shape, with a height of 750 mm, an outer diameter of 500 mm, and a thickness of 20 mm) was performed using the finite element method to investigate the effects of building height and material properties on thermal distortion. Specifically, the evolution of thermal distortion was systematically interpreted with the thermal hysteresis. Depending on the building height of the cylinder, the thermal hysteresis was influenced by the bed plate and the thermal effect of the predeposited and postdeposited layers. In addition, the thermal distortion tendencies of Ti-6Al-4V and Inconel 718 metal powders were examined based on the material properties, particularly thermal diffusivity. The maximum thermal distortion occurred at approximately 100 mm below the top surface of the cylinder for both materials. Moreover, the thermal distortion of the Ti-6Al-4V was more significant than that of Inconel 718 because of the lower thermal diffusivity of the former.
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문화소외지역의 커뮤니티 재생을 위한 영국 청소년 센터 디자인에 관한 연구
배지윤 ( Jiyoon Bae ),이경선 ( Kyungsun Lee ),김우종 ( Woojong Kim ) 한국공간디자인학회 2018 한국공간디자인학회논문집 Vol.13 No.5
(Background and Purpose) In Korea, the policies and programs for youth related to the polarization of social environment and change urgently need to be changed. Particularly, as it is easy to be exposed to diverse problems, such as juvenile delinquency and crime, in culturally or socially marginalized areas, a new type of spatial support for the youth, such as spaces to stay and learn, is desperately needed. Therefore, this study seeks to find ways to improve youth education policy and cultural space in Korea through an analysis of the characteristics of the UK youth education program and welfare policy for community revitalization in culturally marginalized areas, as well as a case analysis of youth center design. (Method) First, the characteristics of UK educational welfare policies, youth policies, and related programs were examined through literature review. Second, the concept and role of community revitalization of UK youth facilities were reviewed. Third, the study analyzed the public, social, and physical environment strategies for sustainable communities and revitalization, through a case study of five UK youth centers, characterized as culturally and socially isolated and built in London and nearby suburbs in 2013. (Results) The case facilities were used to prevent juvenile delinquency and crime in the alienated areas and serve as educational facilities. In terms of publicity, various local governments and councils were organized and actively participated from the early stage of youth center construction, to the promotion of youth learning and after-school activities. The social environment provided spatial programs closely related to the characteristics and needs of the local community, along with various employment, education, and start-up opportunities to save the local economy. In terms of the physical environment, the facilities minimized the impact on the natural environment, enhanced the connectivity and accessibility of traffic, and built friendly and comfortable spaces through high-quality design in consideration of local characteristics. (Conclusions) First, the UK Youth Center is characterized not only as a place for students but also as a community space for communicating with locals. This dual purpose is achieved through institutional and strategic governance systems and the effective participation of individuals and various organizations. Second, the youth center, as a unified educational model, promotes creative and artistic activity through sports and recreational facilities in the multi-purpose space, and facilitates the activation of institutional education outside the shelter. Third, youth centers in culturally marginalized areas can remodel existing buildings or expand public announcements so that more outdoor activities can be accommodated. In Korea, the construction and design of a youth center after a creative school in culturally alienated areas must be accompanied by theoretical analysis and policy to provide training programs according to the local characteristics and conditions. Design should be planned with close interaction with the community involved.
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