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ESM 상호연관분석을 통한 악성코드 탐지정책에 관한 연구
김학수 ( Haksoo Kim ) 한국정보처리학회 2009 한국정보처리학회 학술대회논문집 Vol.16 No.2
갈수록 심각해져가는 보안위협 속에 많은 기관들은 다양한 정보보호시스템을 구축하고, 이를 통합하는 통합보안관리시스템을 운영하고 있다. 이러한 통합보안관리시스템은 이기종간 보안로그를 상호연관 분석 할 수 있는 기능을 다양한 방법을 통해 제공하고 있다. 이러한 다양한 상호연관분석 방법 중 다단계 상호연관분석 방법을 이용한 통합보안관리시스템에서 내부자원이 악성코드에 악용되는 걸 사전에 탐지할 수 있는 상호연관분석 정책을 제안한다.
R-134a를 사용한 자동차용 스크롤 압축기의 스크롤 형상변화가 성능에 미치는 영향
이건호,김학수,조금남,유정열,Lee, Geonho,Kim, Haksoo,Cho, Keumnam,Yoo, Jungyul 대한기계학회 1998 大韓機械學會論文集B Vol.22 No.11
The present study investigated the effects of geometric parameters considered on the performance of an automotive scroll compressor by assuming ideal, semi-real and real gases for R-134a. The geometric parameters were center thickness of scroll, height of scroll and the size of discharge port. Fourth-order Runge-Kutta method was applied to solve the thermodynamic equations, leaking rate equation and the equation of motion of discharge valve for ideal, semi-real, and real gases. The volumetric and adiabatic efficiencies for semi-real and real gases differed little, but those for ideal gas differed by 18% and 25% compared with those for real gas at 2,000rpm. The volumetric efficiency changed little as the design angle of scroll (${\gamma}$) changed, but the adiabatic efficiency at ${\gamma}$ of $34^{\circ}$ was higher by 2.4% than that of $147^{\circ}$ for 2,000rpm. The volumetric and adiabatic efficiencies at scroll height of 29.8mm were higher by 1.7% and 2.8% than those of 65.8mm. The volumetric efficiency changed little as the size of discharge port changed, but the adiabatic efficiency increased a little as the size of discharge port decreased.
김성환(Sunghwan Kim),이창구(Changu Lee),김학수(Haksoo Kim),박성환(Sunghwan Park),고영상(Youngsang Ko) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
The developments of high strength materials for automotive engine moving system have become a critical issue due to the trend of high horse power and down-size engines. A crankshaft, in particular, is of importance because it rotates with experiencing more load as engine power and fuel efficiency are increased. Therefore, stiffness and durability of crankshaft are great concern for entire engine performance as well as life-time. In this study, high strength bainite steel has been developed, and its durability has been increased by 10% compared to conventional high strength steels but maintaining cost and produce ability are similar to those. Also, hardening mechanism and fatigue properties were investigated.