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A Study of Effective Defense-In-Depth Strategy of Cyber Security on ICS
Seong-Muk Choi,Rae-Hyung Kim,Ga-Ye Kim,Hyeon-Kyung Lee,GwangYong Gim,Jong-Bae Kim 보안공학연구지원센터 2016 International Journal of Security and Its Applicat Vol.10 No.5
The system of SCADA(Supervisory Control and Data Acquisition Security) used in electricity, water, petroleum and gas, transportation as well as manufacturing, is to collect scattered data and to monitor assets related as a centralized suppression system. ICS system, including current SCADA, is not isolated from outside, being connected with IT solution, and can operate equipment through broadband network, instead of accessing physically. Accordingly, the security accident of suppressing system can occur in the fields of antagonistic nations, terrorists, foundational facility invaders, natural disasters and ill-will or accidental actions. The security control examined in this study provides a defense-in-depth strategy which is applicable to the effective cyber security strategy regarding ICS to protect the confidentiality of information, zero defect, availability through the classification of control, operational control and technological control.
Combustion and Emission Characteristics of a Natural Gas Engine under Different Operating Conditions
Haeng Muk Cho,Bang Quan He 대한환경공학회 2009 Environmental Engineering Research Vol.14 No.2
Natural gas is a promising alternative fuel of internal combustion engines. In this paper, the combustion and emission characteristics were investigated on a natural gas engine at two different fuel injection timings during the intake stroke. The results show that fuel injection timing affects combustion processes. The optimum spark timing (MBT) achieving the maximum indicated mean effective pressure (IMEP) is related to fuel injection timing and air fuel ratio. At MBT spark timing, late fuel injection timing delays ignition timing and prolongs combustion duration in most cases. But fuel injection timing has little effect on IMEP at fixed lambdas. The coefficient of variation (COV) of IMEP is dependent on air fuel ratio, throttle positions and fuel injection timings at MBT spark timing. The COV of IMEP increases with lambda in most cases. Late fuel injection timings can reduce the COV of IMEP at part loads. Moreover, engine-out CO and total hydrocarbon (THC) emissions can be reduced at late fuel injection timing.
A Study on the Malicious Process Detection System Model based on Security Agent
Seong-Muk Choi,Yeol-Joo Ryou,Hoo-Ki Lee,Hee-Hoon Cho,Jong-Bae Kim 한국정보통신학회 2015 2016 INTERNATIONAL CONFERENCE Vol.7 No.1
As recently use of Internet gets increased rapidly, infection path through the network becomes diverse. In particular, attacks by Bot mainly work at C&C (command-andcontrol) server but it can be secured just by blocking IP because C&C server runs in form of IP. However, these attackers too get gradually intelligent as they try to connect periphrastically in order to avoid server blocking. Once these malicious codes infiltrate user’s system, it is not easy to detect it through general detection method while it is running. In this paper, so, we propose malicious process detection system based on security agent in order to prevent damage caused by malicious code infection from being spread.
Risk Propagation Through a Platform: The Failure Risk Perspective on Platform Sharing
Chang Muk Kang,Hong, Yoo S.,Woonghee Tim Huh,Wanmo Kang IEEE 2015 IEEE TRANSACTIONS ON ENGINEERING MANAGEMENT - Vol.62 No.3
<P>A product platform is a set of subsystems and interfaces that are commonly shared by a variety of products. Although platform sharing is considered an effective means of cost saving, it also runs the risk of propagating a particular failure across multiple products when the platform is defectively designed. Thus, sharing a common platform effectively can amplify the risk of incurring a large number of failures. In this paper, we formulate a quantitative model for assessing amplified failure risk. Our analysis shows an unexpected result that the platform risk increases as we become more assured of our design capability; i.e, when a defective design rarely happens, the magnitude of risk amplification becomes much larger. The numerical investigation of a platform planning case sheds light on the importance of risk assessment in determining the level of commonality in designing a platform.</P>
Microstructural characterization of multiphase GDC/NiO composites using image processing
Seung-Muk Bae,Kyoung-Soo Kang,박주식,황진하 한양대학교 세라믹연구소 2009 Journal of Ceramic Processing Research Vol.10 No.6
Image processing was employed in combination with electron microscopy to quantitatively estimate the spatial microstructure in a multi-phase mixture used in energy-based applications. The original images were obtained using scanning electron microscopy in complementary modes, i.e. secondary electron and back-scattered electron modes. Based on the digitized and optimized images, the microstructural characterization incorporates quantitative information for each constituent, i.e. the fraction, size distribution, and contiguity. The refined image analysis procedure was applied to a mixture composed of an ionic conductor and an electronic conductor, Gd2O3-Doped CeO2 and NiO. The implications of the image processing are discussed with regard to sophisticated synthesis and processing of renewable energy materials.