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AE기법 이용한 JLF/STS304이종재료의 최적 마찰용접조건에 관한 연구
윤한기,이진경,이상필,공유식 한국비파괴검사학회 2003 한국비파괴검사학회지 Vol.23 No.2
저방사화 페라이트강인 JLF는 핵융합로의 블랑켓과 같은 열교환기의 재료로써 유용한 재료이다. 이 재료의 광범위한 적용을 위해서는 JLF강과 다른 재료와의 접합기술의 개발이 중요하다. 최근 두 이종재료간의 접합에는 마찰용접이 많이 이용되고 있으며 본 연구에서도 JLF강과 STS304 간의 마찰용접에 의한 용접특성을 평가하였으며 특히 비파괴기법중의 하나인 음향방출 기법을 이용하여 두 이종재료간의 용접특성 및 최적의 용접조건을 평가하였다. 음향방출 파라미터중의 하나인 카운트와 사상수 등이 최적용접조건 및 용접품질을 평가하는데 유효한 파라미터들이었다. Japanese low activation ferritic steel(JLF) is a good material for the parts of heat exchanger such as blanket and diverter. At first, JLF was developed as a candidate for structural materials in nuclear fusion applications. However, the development of the jointing technique of JLF steel to other materials is important for wide applications of this material to the industry fields. Recently the jointing technologies including diffusion bonding, brazing, roll bonding, explosive bonding and hot iso-static pressing have been studied for the heterogeneous materials of JLF-1 steel(Fe-9Cr-2W-V-Ta) and stainless steel(STS304). Friction welding is one of the most popular welding methods for two different kinds of materials. In this paper, the JLF-1 steel was jointed to STS304 by friction welding method and the optimal conditions of the friction welding discussed. Acoustic emission was used as a nondestructive technique to evaluate the weld quality in processing.
대동맥 판막 치환술 후 반복되는 Acinetobacter baumannii 균혈증의 원인이 된 대동맥염 1예
정용필,김성철,송은희,장은영,김은경,김윤지,성흥섭,김미나,최상호,우준희,김양수 대한감염학회 2007 감염과 화학요법 Vol.39 No.3
감염성 대동맥염은 흔하지 않지만 매우 위중한 질병으로 Salmonella so.와 S. aureus가 주된 원인균이다. 아직까지 병원내 감염의 주요 원인균인 Acinetobacter baumannii에 의한 감염성 대동맥염은 보고된 바가 없었다. 저자들은 대동맥 판막 치환술을 시행받은 76세 남자 환자에서 적절한 항생제 투여에도 반복되는 A. baumannii 균혈증의 원인이 감염성 대동맥염으로 진단되었던 1예를 경험하였기에 보고하는 바이다. Infectious aortitis is an uncommon yet, life threatening disease. Early surgical treatment and prolonged antibiotic therapy is crucial to survival. Salmonella sp. and Staphylococcus aureus are the most common organisms isolated. There is no case report of infectious aortitis caused by Acinetobacter baumannii, which has recently emerged as a major cause of health care-associated infections. Here, we describe a 76-year-old male with infectious aortitis who experienced recurrent bacteremia due to A. baumannii in spite of adequate antimicrobial therapy after aortic valve replacement.
( Sung Woo Cho ),( Jung Hoon Cha ),( Na Ri Park ),( Won Hee Hur ),( Pill Soo Sung ),( Jong Young Choi ),( Seung Kew Yoon ),( Si Hyun Bae ),( Hee Chul Nam ) 대한간학회 2020 춘·추계 학술대회 (KASL) Vol.2020 No.1
Aims: Non-alcoholic fatty liver disease (NAFLD) is a metabolic- related disorder ranging from simple steatosis to more severe forms, but the exact mechanism of progression remains unknown. MicroRNAs(miR), a class of small noncoding RNAs, are implicated in controlling a variety of biological processes. The aim of this study is to investigate the regulatory and protective role of miR-22-3p in NAFLD progression. Methods: Both in vitro and in vivo models of NAFLD were generated by treating HepG2 and Huh-7 cells with palmitic acid (PA) and by feeding mice a high-fat diet (HFD), respectively. HE and Oil Red O staining were used to examine liver tissue morphology and lipid deposition, respectively. qRT-PCR (quantitative real time polymerase chain reaction) was used for investigate expression of miR, SIRT1, and proteins involved in lipogenesis Results: HFD-mice hepatic tissues and PA-treated HepG2 and Huh-7 cells presented excess lipid production. Both in vitro and in vivo NAFLD model displayed decreased miR-22-3p and SIRT1 expression as evidenced by qRT-PCR. Overexpression of miR-22-3p induced downregulation of FAS, PPAR gamma and SREBP-1c via upregulation of SIRT1 expression. Reduction of hepatic lipid accumulation was observed by Oil red O staining. Conclusions: In this study, miR-22-3p had a role in ameliorating hepatic lipogenesis by regulation of SIRT1 signal pathway in NAFLD model. The overexpressed miR-22-3p protects hepatocytes from lipid metabolism and suppresses hepatic lipogenesis, suggesting as a potential target for the therapeutic strategy of NAFLD.
Magnetic Properties of Mn-Doped ZnO Films Prepared by Reactive Cosputtering
Sang Yoon Park,이영백,Jie Hoon Kang,Pill Jin Kim,김태희,Young Jun Yoo 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.3
Zn1¡xMnxO ¯lms with smooth surfaces were prepared Si(100) substrates by reactive cosputtering of high-purity Mn and ZnO targets in an oxygen ambient with partial pressures ranging from 2.2 £ 10¡7 to 1.2 £ 10¡5 Torr. The ¯lm deposited at an oxygen partial pressure of 2.2 £ 10¡7 Torr exhibited a ferromagnetic behavior with a Curie temperature above 350 K while the ¯lms for oxygen partial pressures higher than 1.2 £ 10¡6 Torr revealed nonmagnetic properties. Our results evidently show that the oxygen vacancy plays an important role in the magnetic ordering of Mn-doped ZnO ¯lm. Our experimental results show the possibility for applications of Mn-doped ZnO-based tunneling devices.
Yoon, Yong Pill,Lee, Hyun Jae,Lee, Dong-Ung,Lee, Sang Kook,Hong, Jang-Hee,Lee, Choong Jae The Korean Academy of Tuberculosis and Respiratory 2015 Tuberculosis and Respiratory Diseases Vol.78 No.3
Background: Adenophora triphylla var. japonica is empirically used for controlling airway inflammatory diseases in folk medicine. We evaluated the gene expression and production of mucin from airway epithelial cells in response to lupenone, lupeol and taraxerol derived from Adenophora triphylla var. japonica. Methods: Confluent NCI-H292 cells were pretreated with lupenone, lupeol or taraxerol for 30 minutes and then stimulated with tumor necrosis factor ${\alpha}$ (TNF-${\alpha}$) for 24 hours. The MUC5AC mucin gene expression and production were measured by reverse transcription-polymerase chain reaction and enzyme-linked immunosorbent assay, respectively. Additionally, we examined whether lupenone, lupeol or taraxerol affects MUC5AC mucin production induced by epidermal growth factor (EGF) and phorbol 12-myristate 13-acetate (PMA), the other 2 stimulators of airway mucin production. Results: Lupenone, lupeol, and taraxerol inhibited the gene expression and production of MUC5AC mucin induced by TNF-${\alpha}$ from NCI-H292 cells, respectively. The 3 compounds inhibited the EGF or PMA-induced production of MUC5AC mucin in NCI-H292 cells. Conclusion: These results indicated that lupenone, lupeol and taraxerol derived from Adenophora triphylla var. japonica regulates the production and gene expression of mucin, by directly acting on airway epithelial cells. In addition, the results partly explain the mechanism of of Adenophora triphylla var. japonica as a traditional remedy for diverse inflammatory pulmonary diseases.
Pioglitazone Improves Oocyte Maturation and Subsequent Developmental Competence of Porcine Embryos
Sang-Gi Jeong,Seung-Eun Lee,Won-Jae Kim,Jae-Wook Yoon,Chan-Oh Park,Hyo-Jin Park,Dong-Yong Hong,Eun-Young Kim,Se-Pill Park 한국동물생명공학회(구 한국동물번식학회) 2018 발생공학 국제심포지엄 및 학술대회 Vol.2018 No.06
The optimization of culture condition is both basic and important for improving oocyte maturation, subsequent development of preimplantation embryo, and further implantation. This study performed to confirm effect of pioglitazone (PIO) treatment directly on porcine oocyte during in vitro maturation, further development of embryo. Immature oocytes were cultured in IVM medium, containing 0, 0.01, 0.1, 1, and 10 μM pioglitazone (0, 0.01, 0.1, 1, and 10 PIO, respectively) for 44 h. Although both oocyte survival and polar body emission did not significantly differ between the control and PIO-treated groups, percentage of normal spindle formation and chromosome alignment was increased in the 1 PIO-treated group than in the control group (control, 60.9±8.2%; and 1 PIO, 81.5±5.9%, p<0.1). Level of GSH was significantly increased in 1 PIO-treated group than in the control group (control, 100.0±5.0%; and 1 PIO, 119.8±5.2%, p<0.05), while the level of ROS was not differ in all groups. The rate of blastocyst was significantly higher in the 1 PIO-treated group than in the control at day 6 (control, 29.6±2.5%; and 1 PIO, 37.9±2.3%, p<0.05) and 7 (control, 35.1±1.6%; and 1 PIO, 41.8±2.7%, p<0.05), respectively. These results indicated that PIO treatment during IVM showing beneficial effects on oocyte and embryonic development. Pioglitazone will contribute to enhancing efficiency of in vitro production.