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평판 사이 정방형실린더 주위의 난류 유동에 대한 LES
김도형,양경수,Kim, Do-Hyeong,Yang, Gyeong-Su 대한기계학회 2002 大韓機械學會論文集B Vol.26 No.2
Turbulent flow past a square cylinder confined in a channel is numerically investigated by Large Eddy Simulation(LES). The main objectives of this study are to verify the experimental results of Nakagawa et al.[Exp. in Fluids, Vol. 27, 3, pp. 284∼294, 1999] by LES and to obtain related flow information in detail. The LES results obtained are in excellent agreement with the experiment both qualitatively and quantitatively. The passive paticles numerically released into the flow field clearly show the barman vortex street. However, the vortices shed from the cylinder are significantly affected by the presence of the plates. Futhermore, periodic and alternating vortex-rollups are observed in the vicinity of the plates. The rolled-up vortex is convected downstream together with the corresponding Karman vortex forming a counter-rotating vortex pair. It is also revealed that the cylinder greatly enhances mixing process of the flow.
김도형,양경수,신동신,Kim, Do-Hyeong,Yang, Kyung-Soo,Shin, Dong-Shin 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.10
In this study, turbulent flows in a planar combustor which has a square rib-type flame holder are numerically investigated by Large Eddy Simulation(LES). Firstly, the flow fields with or without jet injection downstream of the flame-holder are examined using uniform inlet velocity. Comparison of the present LES results with experimental one shows a good agreement. Secondly, to investigate mixing of oxidizer(air) and fuel injected behind the flame holder, the scalar-transport equation is introduced and solved. From the instantaneous flow and scalar fields, complex and intense mixing phenomena between fuel and jet are observed. It is shown that the ratio of jet to blocked air velocity is an important factor to determine the flow structure. Especially, when the ratio is large enough, the fuel jet penetrates the main vortices shed from the flame holder, resulting in significant changes in the flow and scalar fields.
김도형,박승민,Kim, Do-Hyeong,Park, Seung-Min 한국정보처리학회 2002 정보처리학회논문지D Vol.9 No.1
본 논문에서는 정보가전용 실시간 운영체제 Q+에 탑재된 라이브러리의 설계 및 구현에 대해 기술한다. 실시간 운영체제에서의 라이브러리는 표준 인터페이스에 따라 정의되어야 하고, 실시간 운영체제의 응용 분야에 적합한 함수들을 제공하여야 한다. 구현된 Q+ 라이브러리는 응용 프로그램간의 호환성을 보장하기 위해서, POSIX.1, ISO 7942 GKS 등의 업계 및 국제 표준에 따라 설계되었다. 그리고, Q+ 응용 분야에 적합한 C 표준 함수, 그래픽/윈도우 함수, 네트워크 관련 함수, 보안 지원 함수, 파일 시스템 관련 함수들을 제공한다. Q+ 라이브러리는 Q+ 커널과 디지털 TV용 셋탑박스, 그리고 디버깅 툴인 KBUG를 이용하여 구현되었다. This paper describes the design and implementation of library for real-time operating system Q+, that was developed for the internet appliance. The library in the real-time operating system should be defined according to the standard interface and support the functions that are adequate to the real-time application. To ensure the compatibility between application programs, the Q+ library follows industrial and international standards, such as POSIX.1, ISO 7942 GKS. And, to support the Q+ application, library provides C standard functions, graphic/window functions, network functions, security support functions, file system functions. The Q+ library was implemented using the Q+ kernel, Digital TV set-top box, and KBUG debugging tool.
실시간 운영체계 Q+를 위한 C 표준 라이브러리 설계 및 구현
김도형,박승민,Kim, Do-Hyeong,Park, Seung-Min 한국정보처리학회 2001 정보처리학회논문지 A Vol.8 No.1
This paper describes the design and implementation of C standard library for real-time operating system Q+, that is being developed for the internet appliance. The C library in the real-time operating system should be defined according to the standard interface and support the concurrent execution of threads. The implemented C standard library is reentrant and follows POSIX.l standard interface. And, the C standard library functions, which are adequate to the Q+ application and commonly provided by commercial real-time operating systems, are selected among POSIX.l standard functions. The C standard library is implemented on the Q+ kernel and D-TV set-top box according to the implementation sequence, which is determined by analyzing the relation of function calls.
금융회사를 위한 기업 정보보호 포털(EISP) 시스템의 설계 및 구현
김도형,Kim, Do-Hyeong 한국융합보안학회 2021 융합보안 논문지 Vol.21 No.1
금융회사는 금융정보를 보호하기 위해 정보보호 전략 및 계획을 수립하고 정보보호 관리체계 운영, 정보보호 시스템 구축 및 운영, 취약점 점검, 보안관제 등 다양한 정보보호 활동을 하고 있다. 본 논문에서는 금융회사에서 수행 중인 각종 정보보호 활동에 대한 가시성을 확보하고 통합 관리할 수 있는 금융회사를 위한 기업 정보보호 포털 시스템을 제시하고자 한다. 기업 정보보호 포털 시스템은 정보보호 부서의 활동을 시스템화하여 정보보호 활동이 정보보호 부서만의 활동이 아닌 최고경영자부터 임직원까지 참여할 수 있도록 통합된 환경을 제공한다. 이를 통해 최고경영진이 기업경영에 정보보호를 반영할 수 있는 정보보호 거버넌스로도 활용할 수 있다. To protect financial information, financial companies establish strategies and plans for information security, operate information security management systems, establish and operate information security systems, check vulnerabilities, and secure information. This paper aims to present an information security portal system for financial companies that can gain visibility into various information security activities being undertaken by financial companies and can be integrated and managed. The information security portal system systemizes the activities of the information security department, providing an integrated environment for information security activities to participate from CEOs to executives and employees, not just from the information security department. Through this, it can also be used as information security governance that can be used by top executives to reflect information security in corporate management.