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모바일 환경 적응 시스템을 위한 보안 서비스 구조 설계 및 구현
김수형(Soo-Hyung Kim),장철수(ChoulSoo Jang),노명찬(MyungChan Roh),김중배(Joong-Bae Kim) 한국정보과학회 2004 한국정보과학회 학술발표논문집 Vol.31 No.1A
본 논문은 모바일 환경 적응 시스템을 대상으로 한 보안 서비스 프레임워크의 요구 사항을 제시하고, 제시된 요구 사항을 만족시킬 수 있도록 개발된 프레임워크의 특징과 구조에 대해서 살펴본다. 개발된 프레임워크는 사용자의 세션과 해당 사용자의 보안 정보를 연계할 수 있는 보안 어댑터 모듈, 사용자 단말의 특성을 이해할 수 있는 단말 프로파일 관리 모듈, 해당 사용자를 인증하고 인증된 사용자의 역할 정보에 기반하여 시스템 자원의 접근을 통제할 수 있는 보안 서비스 모듈로 구성된다.
김수형(Soo-Hyung Kim),장철수(ChoulSoo Jang),노명찬(MyungChan Roh),김중배(Joong-Bae Kim) 한국정보과학회 2003 한국정보과학회 학술발표논문집 Vol.30 No.2Ⅲ
본 논문은 모바일 응용 서버 시스템에서 인증, 역할 기반 접근 제어, 사용자 개인 정보 관리 등과 같은 보안 서비스를 제공하기 위해 개발된 사용자 관리 시스템에 대한 구조와 기능에 대해 설명하고자 한다. 또한, 모바일 환경에 따른 특이 사항들을 처리하는 기능과 방법들에 대해 살펴 볼 것이다. 개발된 사용자 관리 시스템은 크게 응용 서버 시스템의 하위 보안 프레임워크 부분과 모바일 응용 개발자에게 직접 응용의 보안 로직을 개발할 수 있도록 지원 API를 가지며 모바일 응용 서버 시스템 특화된 보안 서비스를 제공하는 모바일 보안 처리 부분으로 나뉘어져 있다.
Yun, Yeo-Myeong,Kim, Myungchan,Kim, Hyojeon,Kim, Dong-Hoon,Kwon, Eilhann E.,Kang, Seoktae Elsevier 2019 Journal of environmental management Vol.234 No.-
<P><B>Abstract</B></P> <P>Demineralization is required in upgrading low-grade coal to serve as an alternative energy resource for the production of fuel and valuable chemicals but generates a large amount of low-grade coal wastewater (LCWW). The objective of this study was to investigate the effects of a co-substrate on an anaerobic membrane bioreactor (AnMBR) treating LCWW. CH<SUB>4</SUB> was not produced during the operation fed by LCWW alone. When yeast wastes (YW) were supplemented, there was a gradual increase in the biodegradability of LCWW, achieving 182 CH<SUB>4</SUB> mL/g COD with 58% COD removal efficiency. The analysis of physicochemical characteristics in the effluent of AnMBR, done by excitation-emission matrix (EEM) and size exclusion chromatography (SEC), showed that the proportion of soluble microbial products (SMPs) and aromatic group with high-molecular weight (>1 kDa) increased. Microbial analysis revealed that the increased dominance of bacteria <I>Comamonas</I>, <I>Methanococcus,</I> and <I>Methanosarcina</I> facilitated biodegradation of LCWW in the presence of YW.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Enhanced biodegradation of low-grade coal wastewater by adding yeast extract. </LI> <LI> Increased soluble microbial products and aromatic groups with high molecular weight. </LI> <LI> Increased dominance of bacteria <I>Comamonas</I>, <I>Methanococcus,</I> and <I>Methanosarcina</I>. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Woong Kim,Seung-Chan Jeong,Chan-young Shin,송미경,조윤,Jung-hee Lim,MyungChan Gye,Jae-Chun Ryu 대한독성 유전단백체 학회 2018 Molecular & cellular toxicology Vol.14 No.2
Backgrounds: Exposure to airborne particulate matter (PM2.5), a PM with an aerodynamic diameter of less than 2.5 μm, is known to be associated with a variety of adverse health effects, particularly related to the respiratory system. However, the molecular mechanisms involved in fine PM toxicity are still not well-characterized. In this study, we estimate pulmonary toxic mechanism using two types (water soluble extract, WPM2.5, and organic soluble extract, O-PM2.5) of PM2.5 on human lung epithelial cells(A549). Methods: Samples were collected using a high-volume air sampler. Each sample was divided into two groups by its own types (water soluble extract, W-PM2.5, and organic soluble extract, O-PM2.5). In the present study, two types of PM2.5-induced cytotoxic and genotoxic effects and expression of toxicity-related genes were evaluated using human lung epithelial cells (A549). Also, the production of intracellular reactive oxygen species was measured to investigate the mechanism of cell death induced by PM2.5 Results: Both W-PM2.5 and O-PM2.5 exposures significantly reduced the viability of A549 cells in a dosedependent manner, and expression of 17 cell deathrelated genes were significantly regulated in the PM2.5 exposure group. Exposure of PM2.5 significantly induced the production of ROS. Further, data obtained from the Comet assay indicated that two extracts of PM2.5 caused DNA damage in A549 cells in a dose-dependent manner. Conclusion: Our study suggests that ROS-mediated DNA damage may play a major role in PM2.5-induced cell death. This finding represents the basis for further studies addressing the pathophysiological mechanisms of PM2.5 exposure.
유기전자소자 적용을 위한 저온 공정용 배리어 박막 연구
Junmo Kim,이동구,이원호,Myungchan An,Youngchan Jang,배형우 한국센서학회 2019 센서학회지 Vol.28 No.6
Recently, semiconducting organic materials have been spotlighted as next-generation electronic materials based on their tunable electrical and optical properties, low-cost process, and flexibility. However, typical organic semiconductor materials are vulnerable to moisture and oxygen. Therefore, an encapsulation layer is essential for application of electronic devices. In this study, SiNx thin films deposited at process temperatures below 150 °C by plasma-enhanced chemical vapor deposition (PECVD) were characterized for application as an encapsulation layer on organic devices. A single structured SiNx thin film was optimized as an organic light-emitting diode (OLED) encapsulation layer at process temperature of 80 °C. The optimized SiNx film exhibited excellent water vapor transmission rate (WVTR) of less than 5 ×10-5g/m2 ·day and transmittance of over 87.3% on the visible region with thickness of 1 µm. Application of the SiNx thin film on the top-emitting OLED showed that the PECVD process did not degrade the electrical properties of the device, and the OLED with SiNx exhibited improved operating lifetime