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Apache와 PostgreSQL을 이용한 WebDAV 서버의 설계
정혜영(HyeYoung Jung),안건태(GeonTae Ahn),박희종(HeeJong Park),문남두(NamDoo Moon),이명준(MyungJoon Lee) 한국정보과학회 2004 한국정보과학회 학술발표논문집 Vol.31 No.1A
분산된 작업 공간의 사용자가 인터넷을 통하여 협업을 할 수 있도록 하기 위하여 WebDAV 명세가 W3C의 IETF의 작업 그룹에 의해서 1992년 2월에 발표되었다. WebDAV는 HTTP/1.1을 확장한 웹 통신 프로토콜로서, 인터넷을 통하여 광범위하고 다양한 콘텐츠의 비동기적인 협업을 지원하기 위한 표준 하부 구조를 제공한다. 이러한 명세를 지원하는 WebDAV 서버의 주요 기능은 HTTP/1.1의 기본적인 웹 서버의 기능을 제공하면서 확장된 WebDAV 명세의 기능을 제공하는 것이다. 본 논문에서 설계한 WebDAV 서버는 WebDAV를 지원하고 있는 공개 소프트웨어인 아파치 웹 서버의 mod_dav 모듈을 확장한 것으로 WebDAV의 자원과 속성 및 잠금 정보를 기존의 파일 시스템의 파일 형태로 관리하고 있는 것을 자원의 속성과 잠금 정보 부분을 PostgreSQL 데이터베이스에서 관리하도록 하였다. WebDAV 자원의 속성과 잠금 정보를 파일로 관리함으로 인한 성능 저하와 확장성의 문제를 해결할 수 있다.
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Heui Joo Park,Yeong-chun Kim,Heejong Moon,Minwon Park,Inkeun Yu 대한전기학회 2018 Journal of Electrical Engineering & Technology Vol.13 No.3
Degradation due to delamination occurs frequently in the high temperature superconductors (HTS) coil of rotating machines made with 2nd generation (2G) HTS wire, and the authors have observed other similar cases. Since an HTS field coil for a rotating machine is required to have stable current control and maintain a steady state, co-winding techniques for insulation material and epoxy resin for shape retention and heat transfer improvement are applied during coil fabrication. However, the most important limiting factor of this technique is delamination, which is known to be caused by the difference in thermal expansion between the epoxy resin and 2G HTS wire. Therefore, in this study, the experimental results of mixing the ratio of epoxy resin and alumina (Al2O3) filler were applied to the fabrication of small and large test coils to solve the problem of degradation. For the verification of this scheme, eight prototypes of single pancake coils with different shapes were fabricated. They showed good results. The energization and operation maintenance tests of the stacked coils were carried out under liquid neon conditions similar to the operation temperature of an MWclass rotating machine. In conclusion, it was confirmed that the alumina powder mixed with epoxy resin in an appropriate ratio is an effective solution of de-lamination problem of 2G HTS coil.
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Park, Heui Joo,Kim, Yeong-chun,Moon, Heejong,Park, Minwon,Yu, Inkeun The Korean Institute of Electrical Engineers 2018 Journal of Electrical Engineering & Technology Vol.13 No.3
Degradation due to delamination occurs frequently in the high temperature superconductors (HTS) coil of rotating machines made with 2nd generation (2G) HTS wire, and the authors have observed other similar cases. Since an HTS field coil for a rotating machine is required to have stable current control and maintain a steady state, co-winding techniques for insulation material and epoxy resin for shape retention and heat transfer improvement are applied during coil fabrication. However, the most important limiting factor of this technique is delamination, which is known to be caused by the difference in thermal expansion between the epoxy resin and 2G HTS wire. Therefore, in this study, the experimental results of mixing the ratio of epoxy resin and alumina ($Al_2O3$) filler were applied to the fabrication of small and large test coils to solve the problem of degradation. For the verification of this scheme, eight prototypes of single pancake coils with different shapes were fabricated. They showed good results. The energization and operation maintenance tests of the stacked coils were carried out under liquid neon conditions similar to the operation temperature of an MW-class rotating machine. In conclusion, it was confirmed that the alumina powder mixed with epoxy resin in an appropriate ratio is an effective solution of de-lamination problem of 2G HTS coil.
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THERMO-MECHANICAL COUPLED ANALYSIS OF HOT PRESS FORMING WITH 22MnB5 STEEL
Hyung-gyu Kim,Chanhee Won,Seungho Choi,Moon-gyu Gong,Joon-gyu Park,Heejong Lee,Jonghun Yoon 한국자동차공학회 2019 International journal of automotive technology Vol.20 No.4
This paper mainly concerns the thermo-mechanical analysis to evaluate the process parameters in the hot press forming with the 22MnB5 sheet such as the austenitization temperature, transport and quenching time for enhancing the efficiency in the production cycle. It is noted that the transport time is most influencing process parameter in the hot press forming to increase production efficiency without sacrificing the strength of the final product. In addition, we newly proposed a scheme to reproduce the flow curves of the hot stamped 22MnB5 sheet with respect to the martensite fraction by correlating the numerical analyses and tensile test results. To take into consideration of the strength variation in the hot stamped door impact beam, entire part is partitioned into several domains on which adaptive flow curves are assigned with respect to the martensite fraction. It demonstrates a good agreement with experimental 3-point bending test with the hot stamped door impact beam when applying the proposed method adopting adaptive flow curves with respect to the martensite fraction.
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Lee, Se-Jung,Cho, Young-Hwa,Kim, Heejong,Park, Keerang,Park, Sung-Kyu,Ha, Sang-Do,Kim, Wun-Jae,Moon, Sung-Kwon Spandidos Publications 2009 ONCOLOGY REPORTS Vol.22 No.6
<P>The thorns of Gleditsia sinensis have traditionally been used in the treatment of several diseases, which includes their use as anti-tumor agents, but there has been no scientific evidence of this anti-tumor effect. However, the present study has identified a novel mechanism for the anti-tumor effect of Gleditsia sinensis thorns in the treatment of colon cancer. Treatment with the ethanol extract of Gleditsia sinensis thorns (EEGS) resulted in significant growth inhibition together with G2/M-phase cell cycle arrest at a dose of 600 microg/ml (IC50) in HCT116 cells. In addition, treatment with EEGS induced p27 expression and down-regulated expression of cyclins and cyclin-dependent kinases. Moreover, EEGS treatment induced phosphorylation of extracellular signal-regulated kinases (ERK), p38 MAP kinase and JNK (c-Jun N-terminal kinases). Among the pathways examined, only PD98059 (ERK-specific inhibitor) abolished EEGS-dependent p27 expression. Similarly, suppression of ERK function reversed EEGS-mediated cell proliferation inhibition and decreased cell cycle proteins. In addition, tumor necrosis factor-alpha (TNF-alpha)-induced matrix metalloproteinase-9 (MMP-9) expression was inhibited by EEGS treatment via decreased transcriptional activity of both activator protein-1 (AP-1) and nuclear factor-kappaB. Finally, EEGS treatment significantly reduced tumor sizes in HCT116 cell-xenografted tumor tissues, which was associated with the changed levels of ERK phosphorylation, p27 and MMP-9 expression. Overall, these results have identified a novel molecular mechanism for EEGS in the treatment of colon cancer and might provide a theoretical basis for the potential therapeutic use of EEGS in the treatment of malignancies.</P>
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