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Why No Backward-moving Wave Occurs in a Homogeneous Semi-infinite Dielectric Slab?
Incheol SHIN,윤성현 한국물리학회 2014 새물리 Vol.64 No.10
The usual textbook determination of the wave resulting from a wave incident onto a homogenous semi-infinite slab presupposes the absence of a backward-moving wave within the slab. However, in the case of electromagnetic waves, this seems, at least to some, to be in apparent contradiction with the physical intuition on the radiation emitted by the constituents of the medium. In this paper we resolve the issue from a scattering-theoretic point of view. For the case of a slab of finite length, the scattered wave within the medium consists of both forward- and backward-moving ones, and the backward-moving part turns out to be a superposition of the waves due to single and multiple planar reflections at the second boundary of the slab. For time-harmonic waves, each such contribution is oscillatory and exponential in the slab length, leading to the absence in dispute. We also provide another justification for the absence based on the simple symmetry of a semi-infinite slab and a composition rule of scattering matrices for one-dimensional composite systems.
A Novel Abnormal Behavior Detection Framework to Maximize the Availability in Smart Grid
Incheol Shin 한국스마트미디어학회 2017 스마트미디어저널 Vol.6 No.3
A large volume of research has been devoted to the development of security tools for protecting the Smart Grid systems, however the most of them have not taken the Availability, Integrity, Confidentiality (AIC) security triad model, not like CIA triad model in traditional Information Technology (IT) systems, into account the security measures for the electricity control systems. Thus, this study would propose a novel security framework, an abnormal behavior detection system, to maximize the availability of the control systems by considering a unique set of characteristics of the systems.
Shin, Incheol,Lee, Zee-Won,Kweon, Soo-Mi,Leem, Sun-Hee,Kim, Jae-Hong,Kim, Byung-Chul,Ha, Kwon-Soo 東亞大學校附設遺傳工學硏究所 1999 遺傳工學硏究 Vol.- No.6
We have investigated possible roles of RhoA and H₂O₂ in the elevation of intracellular Ca²+[Ca²+]i) by phosphatidic acid (PA) in Rat-2 fibroblasts. PA induced a transient elevation of [Ca²+]i in nthe presence or absence of EGTA. Lysophosphatidic acid (LPA) also increased [Ca²+]i, but the sustained Ca²+ response was inhibited by EGTA. LPA stimulated the production of inositol phosphates, but PA did not. In the presence of EGTA, preincubation with LPA completely blocked the subsequent elevation of [Ca²+]i by PA, but not vice versa. PA stimulated the translocation of RhoA to the particulate fraction as did LPA. Scrape loading of C3 transferase inhibited the transient Ca²+ response to PA, but not to LPA, suggesting an essential role of RhoA in the elevation of [Ca²+]i by PA, H₂O₂ also induced a transient increase of [Ca²+]i as did PA. H₂O₂ scavengers, catalase and N-acetyl-L-cysteine, completely blocked the rise of [Ca²+]i stimulated by PA, but not by LPA. Furthermore, preincubation with PA blocked the subsequent Ca²+ response to H₂O₂, and the incubation with H₂O₂ also blocked the PA-induced rise of [Ca²+]i. Thus, it was suggested that PA stimulated Ca²+ release from PA-sensitive, but not inositol 1,4,5-trisphosphate-sensitive,Ca²+? stores by the activation of RhoA and intracellular H₂O₂.
A Novel Abnormal Behavior Detection Framework to Maximize the Availability in Smart Grid
Shin, Incheol THE KOREAN INSTITUTE OF SMART MEDIA 2017 스마트미디어저널 Vol.6 No.3
A large volume of research has been devoted to the development of security tools for protecting the Smart Grid systems, however the most of them have not taken the Availability, Integrity, Confidentiality (AIC) security triad model, not like CIA triad model in traditional Information Technology (IT) systems, into account the security measures for the electricity control systems. Thus, this study would propose a novel security framework, an abnormal behavior detection system, to maximize the availability of the control systems by considering a unique set of characteristics of the systems.
신인철(Incheol Shin) 한국정보보호학회 2014 情報保護學會誌 Vol.24 No.5
최근, 에너지, 정보통신, 방위산업, 정부, 금융 등 국가기반시설(national critical infrastructures)들에 대한 사이버 보안 위협이 급격히 증가하고 있으며 이에 대응하기 위해 미국을 비롯한 주요 국가에서는 감시제어 및 데이터 취득 시스템(SCADA: Supervisory Control and Data Acquisition)에 대한 사이버 보안에 많은 노력을 기울이고 있다. 특히, 주요 국가기반시설은 다양한 실시간 분산 제어시스템 및 네트워크를 통해 사이버 세계(cyber world)와 물리적 세계(physical world)를 연계한다. 하지만 이 같은 역동성(dynamic), 확장성(scalability), 다양성(diversity)으로 특징지어질수 있는 실시간 분산제어시스템간의 상호연결과 연동을 통해 구성되는 해당시설은 기존의 보안기술 적용을 통해 보안성향상을 기대할 수 없다. 따라서 본고에서는 실시간 분산 제어시스템과 다양한 네트워크로 구성되는 기반시설들을 대상으로 하는 여러 가지 보안 위협 및 특징을 소개하고 이에 대응하기 위한 전략 및 연구기술 동향을 간략히 서술한다.
SDN을 통한 스마트그리드 복원력(Resilience) 향상 이슈
신인철(Incheol Shin) 한국정보보호학회 2015 情報保護學會誌 Vol.25 No.5
SDN (Software Defined Networking)은 동적 재설정(Dynamic Reconfiguration)기능을 통해 지금껏 존재하지 않았던 유연성(Flexibility)을 IP(Internet Protocol)에 제공한다. 또한, 네트워크 관리, QoS (Quality of Service) 최적화, 시스템 복원력(Resilience) 강화를 위한 다양한 응용프로그램을 지원한다. 스마트그리드(Smart Grid)시스템에 SDN을 적용하기 위한 다양한 연구가 진행 중이며, 본 문서에서는 다양한 사고(Failures) 혹은 불법적인 공격으로부터 해당 시스템 복원력향상을 위한 이슈에 대해 언급한다. 이와 같은 문제점들에 대한 논의 없이 전력회사는 SDN의 장점을 충분히 활용하지 못할 가능성이 높다. 본 문서를 통해, SDN을 통한 스마트그리드 복원력향상, SDN으로 인한 추가적인 보안위협 등에 대해 논의할 것이다.