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Cu-Ni-Zn 페라이트의 미세조직과 전자파 흡수 특성
정재우,이완재,Jeong, Jae-U,Lee, Wan-Jae 한국재료학회 1995 한국재료학회지 Vol.5 No.5
EMI 대책용 전자파 흡수체로 알려진 cu-Ni-쿠 페라이트를 분말야금법으로 제조하여, 성형압력과 소결온도의 변화에 따른 미세조직을 과낯ㄹ하고, 투과반사법으로 전자파 흡수능을 측정하여 조직과의 관계로 검토하였다. 하소는 공기중에서 90$0^{\circ}C$로 2시간동안 행하는 것이 최적이었다. 미세조직과 입자의 크기는 성형압과 소결온도로 제어할 수 있다. 100Mpa로 성형한 것이 치밀하고, 전자파 흡수특성이 우수하였다. 복소유전율과 복소투자율은 기공도와 소결밀도에 영향을 받았다. 전자파흡수능은 밀도보다는 입자의 크기에 더 큰 영향을 받았다.
미국과 한국의 복합운송 전개와 시사점 : 미국 철도운송을 중심으로
정재우,김희철 한국무역통상학회 2019 무역통상학회지 Vol.19 No.6
This article relates the current status of rail-oriented international multimodal transport between the United States and South Korea. For this article, the issue will be on rail freight transport of United States of America as this mode is the most important mode for North America. Most of all, the objective of this paper is to provide a first approximation of the rail freight infrastructure developments and improvements in the continental United States rail network. So the methodology of this paper is to conduct comparative analysis with United States and South Korea in terms of GDP, trade volume, the current status of container terminal, the implementation of international multimodal transport. United States is well established in the field of rail transportation network. But South Korea has a very strong competitiveness in the field of road transportation.
Amino acid transporters as tetraspanin TM4SF5 binding partners
정재우,김지언,김은미,Jung Weon Lee 생화학분자생물학회 2020 Experimental and molecular medicine Vol.52 No.-
Transmembrane 4 L6 family member 5 (TM4SF5) is a tetraspanin that has four transmembrane domains and can be Nglycosylated and palmitoylated. These posttranslational modifications of TM4SF5 enable homophilic or heterophilic binding to diverse membrane proteins and receptors, including growth factor receptors, integrins, and tetraspanins. As a member of the tetraspanin family, TM4SF5 promotes protein-protein complexes for the spatiotemporal regulation of the expression, stability, binding, and signaling activity of its binding partners. Chronic diseases such as liver diseases involve bidirectional communication between extracellular and intracellular spaces, resulting in immune-related metabolic effects during the development of pathological phenotypes. It has recently been shown that, during the development of fibrosis and cancer, TM4SF5 forms protein-protein complexes with amino acid transporters, which can lead to the regulation of cystine uptake from the extracellular space to the cytosol and arginine export from the lysosomal lumen to the cytosol. Furthermore, using proteomic analyses, we found that diverse amino acid transporters were precipitated with TM4SF5, although these binding partners need to be confirmed by other approaches and in functionally relevant studies. This review discusses the scope of the pathological relevance of TM4SF5 and its binding to certain amino acid transporters.
정재우,이범호,이시원,최승현,김덕진 한국자동차공학회 2022 International journal of automotive technology Vol.23 No.2
Recently, considerable effort has been devoted to improving vehicle fuel efficiency and emissions during real road trips. An analysis of vehicle driving energy is typically based on vehicle dynamics, and it has been very effectively used for the analysis of vehicle operation, brake down analysis of the required energy, prediction of vehicle performance, and vehicle control design. In this work, on the basis of the results of driving and powertrain operation analyses performed for diesel sport utility vehicles, a new trip unit of CO2 emission and NOx emission model that reflects real road operating conditions such as the coolant temperature and engine and vehicle efficiency changes is presented. In particular, the developed model does not require detailed powertrain specifications and performance maps, and is constructed to enable simple configuration, easy utilization, and extended application. The model was verified by comparing its results with those of the National Institute of Environmental Research (NIER) driving mode test, which is a domestic vehicle driving mode test, and with the results of an actual road driving analysis. Finally, a model analysis of energy consumption factors for different vehicle speeds on real roads is presented.