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허원근,김희선,김광조 한국정보보호학회 2000 情報保護學會誌 Vol.28 No.1
본 연구는 전자선거 프로토콜의 요구사항을 규정해 보고, 컴퓨터 통신상에서 이를 충족시키기 위한 암호기법 들을 분석해 본다. 전자선거의 도입이 선거 비용을 절감시키고 투표 장소의 제약을 획기적으로 개선하지만 매표방지등의 문제로 아직은 완전한 이동성을 제공하지는 못한다. 그리고 투표결과의 정확성 검증과 매표방지는 서로 상충되는 요구사항이기도 하다. 실제선거에서는 효율성의 문제로 영지식증명기법등의 사용이 제약 받을 수도 있다. 이러한 문제들을 정리하고, 실제의 선거 절차와 선거 속성들이 전자선거 프로토콜로 어떻게 구현되었는지 비교 검토함으로써, 규정한 요구사항들의 선택적인 적용에 활용코자 한다.
The presence of high level soluble herpes virus entry mediator in sera of gastric cancer patients
허숙경,주성아,김규열,박상민,Sung Hun Back,박능화,민영주,안원근,Thu-Ha Thi Nguyen,Sun-Min Kim,김병삼 생화학분자생물학회 2012 Experimental and molecular medicine Vol.44 No.2
The development of gastric cancer (GC) is closely related to chronic inflammation caused by Helicobacter pylori infection, and herpes virus entry mediator (HVEM) is a receptor expressed on the surface of leukocytes that mediates potent inflammatory responses in animal models. However, the role of HVEM in human GC has not been studied. Previously, we showed that the interaction of HVEM on human leukocytes with its ligand LIGHT induces intracellular calcium mobilization,which results in inflammatory responses including induction of proinflammatory cytokine production and anti-bacterial activities. In this study, we report that leukocytes from GC patients express lower levels of membrane HVEM (mHVEM) and have lower LIGHT-induced bactericidal activities than those from healthy controls (HC). In contrast, levels of soluble HVEM (sHVEM) in the sera of GC patients were significantly higher than in those of HC. We found that monocyte membrane-bound HVEM is released into the medium when cells are activated by proinflammatory cytokines such as TNF-α and IL-8, which are elevated in the sera of GC patients. mHVEM level dropped in parallel with the release of sHVEM, and release was completely blocked by the metalloprotease inhibitor,GM6001. We also found that the low level of mHVEM on GC patient leukocytes was correlated with low LIGHT-induced bactericidal activities against H. pylori and S. aureus and production of reactive oxygen species. Our results indicate that mHVEM on leukocytes and sHVEM in sera may contribute to the development and/or progression of GC.
이정섭,허정필,김성준,최원근,이우종,이상민,정영석 한국화재감식학회 2018 한국화재감식학회 학회지 Vol.9 No.1
As demand for photovoltaic system increases, there were the fire accidents related to photovoltaic array junction box. In this study, we have revealed that the junction box be exposed to the humid air and easily subjected to the fire by short-circuit. And though the arc in the box, the DC is continuously applied to the box and the risk of electric shock increases.
자동차 주유구 커버에 대한 사출성형과 2색 코팅 동시 구현에 관한 연구
배형섭,박동현,김부곤,서창호,허원근,이호상,Bae, Hyung-Sup,Park, Dong-Hyun,Kim, Boo-Kon,Seo, Chang-Ho,Heo, Won-Geun,Lee, Ho-Sang 한국금형공학회 2021 한국금형공학회지 Vol.15 No.1
Mold design for in-mold coating was carried out to achieve simultaneous injection molding and two-color coating for car gas cap cover. The developed mold includes one core and three cavities which are composed of a substrate cavity and two coating cavities. To provide a sealing edge for complete seal during the second coating, the first coated material was used at the boundary between the first coating and the second one, and injection molded substrate was used at the parting line. The materials used were PC/ABS for substrate and 2-component Polyurea for coating. Through experiments, it was found that the suggested sealing edges were effective for complete seal during the second coating. In cavity pressure traces, there were three peaks caused by mold closing, coating-material injection and cleaning-piston advancement inside the mixing head. The cavity pressure increased with decreasing coating thickness.