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김재중 ( J.-j. Kim ),김기인 ( G..-i. Kim ),곽은영 ( E.-y. Kwak ),권호열 ( H.-y. Kwon ),권원일 ( W. Kwon ) 한국정보처리학회 2010 한국정보처리학회 학술대회논문집 Vol.17 No.1
IT 기술의 발달로 자료의 대형화, 통신의 초고속 광역화가 이루어짐에 따라 우리 실생활과 비즈니스에 밀접하게 연관되어있을 뿐 만 아니라, 분산서비스거부(DDos)공격과 대규모 개인정보 유출사례 등은 데이터베이스(DB) 보안의 중요성은 한층 높아지고 있다. 본 논문에서는 대형 개인 정보 유출사고의 가능성을 안고 있는 기업에서 DB 암호화 구축 이후 발생할 수 있는 장애요소를 최소화할 수 있도록 DB 보안 요구사항에 기반한 점검 항목을 도출하고 테스트 방안을 제시하였다.
논문 : 기계적 성질 ; 용탕단조된 Mg-Al-Zn-Si합금의 미세조직 및 파괴거동
김재중 ( Jae Joong Kim ),추성훈 ( Seong Hun Choo ),김도향 ( Do Hyang Kim ),김락준 ( Nack J. Kim ) 대한금속재료학회 ( 구 대한금속학회 ) 1998 대한금속·재료학회지 Vol.36 No.6
Microstructure and fracture behavior of the squeeze cast Mg-Al-Zn-Si alloys (AZ91-Si, AZ51-Si, AZ51 Si-Ca) have been investigated in the present study. To clarify the fracture behavior, in-situ fracture test and fractographic observation were conducted. The higher Al content promoted formation of the polygonal type Mg2Si, but resulting in reduction of the ductility due to increase in amount of Mg17Al12 and to presence of coarse Mg2Si. The lower Al content favored formation of the chinese script type Mg2Si which promoted the brittle fracture along the Mg2Si/matrix interface. AZ51-Si alloy had a higher ductility than AZ91-Si, because a number of slip lines were developed inside grains and cracks were blunted by matrix. The addition of Ca eliminated the chinese script type Mg2Si. Instead, fine Mg2Si particles were present in a polygonal shape, resulting in improvement of mechanical properties.
박정철(J. C. Park),김재중(J. J. KIM),김인철(I. C. KIM) 한국해양공학회 2001 韓國海洋工學會誌 Vol.15 No.2
Water waves propagate over irregular bottom bathymetry are transformed by refraction, diffraction, shoaling, reflection etc. Principal factor of wave transform is bottom bathymetry, but in case of current field, current is another important factor which effect wave transformation. The governing equation of this study is develop as wave-current equation type to investigate the effect of wave-current interaction. Is starts from Berkhoff's(1972) mild slope equation and is transformed to time-dependent hyperbolic type equation by using variational principal, Finally the governing equation is shown as a parabolic type equation by splitting method.<br/> This wave-current model was applied to the Kwangan beach which is located at Pusan. The numerical simulation results of this model show the characteristics of wave transformation and flow pattern around the Kwangan beach fairly well.
박정철(J. C. Park),김재중(J. J. Kim),이정만(J. M. Lee) 한국항해항만학회 2000 한국항해항만학회 학술대회논문집 Vol.1 No.2
Water waves propagate over irregular bottom bathymetry are transformed by refraction, diffraction, shoaling, reflection etc. Principal factor of wave transform is bottom bathymetry, but in case of current field, current is another important factor which effect wave transformation. The governing equation of this study is develop as wave-current equation type to investigate the effect of wave-current interaction. This wave-current model was applied to the Kwangan beach which is located at Pusan. The numerical simulation results of this model show the characteristics of wave transformation and flow pattern around the Kwangan beach fairly well.