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김진욱,김근영,Kim. Jin-Wook,Kim. Guen-Young 한국방재학회 2008 한국방재학회 학술발표대회논문집 Vol.2008 No.1
Because nature disaster would be increased society damage, government has to prepare the system for response to the disaster. In this study we proposed the concept element of response technology and strategy for the flood and typhoon disaster. And we define the emergence service criteria.
고정 소수점 산술연산에 기반한 양방향 DC-DC 컨버터의 디지털 제어기 설계
장명혁(Myung-Hyuk Jang),김근영(Guen-Young Kim),이광운(Kwang-Woon Lee) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
본 논문에서는 비절연 하프브리지 타입 양방향 DC-DC 컨버터의 전류 및 전압 제어기를 고정소수점 산술 연산에 기반하여 설계하는 방법에 대해 제안하고, PSIM을 이용한 컴퓨터 모의실험을 통해 제안된 방식의 유효성을 검증하였다.
이홍규(Lee hong-kyu),김근영(Kim guen-young),유대성(Yoo dae-sung),오창석(Oh chang-suk) 한국콘텐츠학회 2004 한국콘텐츠학회 종합학술대회 논문집 Vol.2 No.1
본 논문에서는 최근에 빈번하게 발생하는 트래픽 폭주 공격에 대해 대응하기 위하여 기존의 SNMP를 이용하는 트래픽 폭주공격 탐지방법을 향상시키기 위해 임계값 ε와 임계값 θ을 사용하였다. 임계치에 따라서 트래픽 분석을 실행시킴으로써 시스템 자원을 보다 효율적으로 이용하기 위한 방법을 제시하였다. In this paper, We used thresholds ε, θ to improve traffic flooding attack detection method using SNMP in opposition to frequent traffic flooding attack. accordingly, we can use system resourses more efficient as execute traffic analysys by threshold
팽창률이 일정한 노즐을 사용한 AIR-KNIFE 유동에 관한 연구
이동원(Dong-Won Lee),강남철(Nam-Cheol Kang),김근영(Guen-Young Kim),권영두(Young-Doo Kwon),권순범(Soon-Bum Kwon) 한국전산유체공학회 2008 한국전산유체공학회지 Vol.13 No.4
In the process of continuous hot-dip galvanizing, it is well known that the gas wiping through an air knife system is most effective because of its uniformity in coating thickness, possibility of thin coating, workability in high speed, and simplicity of control. However, gas wiping used in the galvanizing process brings about a problem of splashing at the strip edge above a certain high speed of process. It is also known that the problem of edge splashing is more harmful than that at the mid strip surface. For a given liquid(of a certain viscosity and surface tension), the onset of splashing mainly depends upon the strip velocity, the gas-jet pressure, and the nozzle’s stand-off distance. In these connections in the present study, we proposed three kinds of air knife system having nozzles of constant expansion rate, and compared the jet structures issuing from newly proposed nozzle systems with the result by a conventional one. In numerical analysis, the governing equations are consisted of two-dimensional time dependent Navier-Stokes equations, and the standard k-ε turbulence model is employed to solve turbulence stress and so on. As the result, it is found that we had better use the constant expansion-rate nozzle which can be interpreted from the point view of the energy saving for the same coating thickness. Also, we better reduce the size of separation bubble and enhance the cutting ability at the strip surface, by using an air-knife having constant expansion-rate nozzle.