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인터쿨러용 판형열교환기 내부유로의 유동현상에 관한 전산유체해석
윤천석(Cheon Seog Yoon),한승한(Seunghan Han) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Plate heat exchangers (PHE) have been widely used in different industrial applications, because of high heat transfer efficiency per unit volume. Basic study is performed for the feasibility of PHE to intercooler in automotive. In order to understand the flow phenomena in the plate heat exchanger, a channel which was formed by the upper and lower plate in single plate was considered as calculation domains. Because chevrons attached on the upper plate are brazed with chevrons attached on the lower plate. the flow channel has very complex configuration. This complex geometry was analyzed by Fluent which is general CFD (computational fluid dynamics) S/W. To validate this methodology the proper experimental and theoretical data are collected and compared with numerical results. Finally, due to the lack of experimental values for PHE to intercooler, various chevron angles and air velocities at inlet were tested in terms of physical phenomena. From this point of view, results of velocity vector path lines, static pressure, heat flux. heat transfer coefficient, and Nusselt number are physically reasonable and accepted for the solutions. Thus, the methodology of the flow analysis in the full geometry of the channel was established for the predictions of performance in plate heat exchanger.<br/>
이질적인 환경에서 사용 환경 기반 적응형 컨텐츠 서비스 시스템
김천석(Cheon Seog Kim),김덕연(Duck Yeon Kim),윤정현(Jeong Hyun Yoon),이정근(Jeong Keun Lee),노용만(Yong Man Ro) 한국방송·미디어공학회 2004 한국방송공학회 학술발표대회 논문집 Vol.2004 No.-
본 논문에서는 사용자의 다양한 이질적인 사용 환경(단말기기, 네트워크 품질 등)에 최적화된 멀티미디어 컨텐츠를 제공하는 시스템에 대해 제안한다. 제안된 시스템은 MPEG-21 멀티미디어 프레임 워크를 기반으로 한다. 시스템은 클라이언트 미디어 서버, 적응 변환 서버, 그리고 툴 서버로 구성된다. 또한 제안된 시스템은 사용자의 사용 환경 정보를 분석하고, 생성하는 사용 환경 정보 에이전트 모듈과, 이를 받아 분석하는 정책 결정 엔진 모듈, 그리고 이를 제어 하고 관리하는 제어모듈도 제공된다. 구성된 시스템에 대해 MPEG-2 교육 방송 컨텐츠에 대해 다양한 사용환경에 대해 적용하여 제안된 MPEG-21 기반 서비스 시스템이 유효함을 확인 하였다.
Jeong Yoon Chae,Park Jihyun,Cheon Yu Jeong,Lee Ki Seog 한국응용생명화학회 2023 Applied Biological Chemistry (Appl Biol Chem) Vol.66 No.-
Mycobacterium tuberculosis CuvA (Rv1422, MtCuvA) has previously been suggested that it may play a critical role in nutrient utilization and cell wall synthesis required for physiological adaptation in a host cell, but its biochemical details remain unclear. Our previous studies showed that MtCuvA can bind to uridine diphosphate (UDP) sugars as a cell wall precursor component. To verify its functional roles, we report here the biochemical properties of MtCuvA for the binding of UDP-N-acetylglucosamine (GlcNAc) using site-directed mutagenesis and docking simulation. The KD values for UDP-sugars indicate that MtCuvA prefers to bind UDP-GlcNAc as a physiological ligand compared to UDP-glucose. Mutational studies of MtCuvA showed that H12A, T33A, D36A, Q154A, S196, T199A, N226A, and H298A mutants significantly affected the binding to UDP-GlcNAc. We also observed that UDP, but not GlcNAc, could bind to MtCuvA. These results imply that the presence of UDP moiety in the ligand is necessary for interaction with MtCuvA. Moreover, mutational studies of MtCuvA with UDP showed that residues H12, S196, T199, N226, and H298 may be involved in its binding to the UDP moiety, almost consistent with the docking simulation results. Our results provide an insight into the interaction of MtCuvA with UDP-GlcNAc as a key precursor of peptidoglycan.
Simulation of Quench in Pancake-shaped Superconducting Magnet Using a Quasi-three-dimensional Model
Wang, Qiuliang,Yoon, Cheon-Seog,Kim, Kee-Man The Korean Superconductivity Society 2000 Progress in superconductivity Vol.1 No.2
A quench phenomenon is caused by an external disturbance in a superconducting magnet, where the magnet is operating in a cryogenic environment. The heat coupling between the layers and pancakes of the magnet can induce the normal zone propagation with fast speed. In order to analyze quench behavior in a pancake-shaped superconducting magnet, a quasi-three-dimensional model is proposed. A moving mesh finite volume method is employed in solving the heat conduction equation. The quench process of the superconducting magnet is studied under the various operating conditions and cooling conditions.