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Mo-실리사이드 형성 메카니즘에 관한 연구 : Ⅱ. 表面 Morphology와 電氣的 特性 Ⅱ. Surface Morphologies and Electrical Properties
박종윤,한전건,이상균,김기선 성균관대학교 기초과학연구소 1992 論文集 Vol.43 No.2
Mo-disilicide 박막은 n-Si(100) 기판위에 전자선 증착과 이어지는 진공 또는 질소 분위기에서 급속 열처리(RTA : Rapid Thermal Annealing) 장치에 의한 열적 확산(thermal diffusion)법에 의해서 만들어졌다. 이들 박막의 화학적 조성과 morphology는 XRD, AED(ADP), TEM, NOM에 의해서 분리되어졌다. Mo/Si계의 안정된 최종상은 tetragonal-MoSi₂였고, 표면 morphology와 grain size는 상호 의존하며 열처리 온도에 따하서 크기가 증가되었다. 상온에서 증착한 박막에서는 계면에서 얇은 SiO_2 층이 보였고 이 층의 존재로 Si의 확산이 억제됨을 확인하였으며, 기판온도를 400℃로 유지하며 pre-annealing을 120분 동안 부여한 시료에서는 Mo-silicide가 columnar 구조로 성장됨이 보였다. 그리고, 전기적 특성은 sheet 저항과 Schotty 장벽높이가 조사되었는데, 열처리 온도 증가에 따라 감소하는 sheet저항은 grain size에 의존하며, 최저치는 700℃에서 1분 동안 열처리 한 시료의 값인 2.1Ω/□으로 열처리 온도 증가에 대해 더 이상 변화하지 않는 최종적인 값이다. 그러나 Schotty barrier height는 0.56eV로 열처리 온도, 분위기에 따라 변화하지 않으며 hexagonal-과 tetragonal-MoSi₂둘 모두에서 같았다. Molybdenum disilicide films have been prepared onto n-Si(100) substrates with electron-beam deposition and sequently post-annealing by rapid thermal annealing in the ambient of N₂ or vacuum. The chemical compositions and morphology of films were analyzed by XRD, ADP, TEM, and NOM methods. We confirm that the stable phase of Mo/Si system is tetragonal-MoSi₂ phase, and the surface morphology and grain size were depended upon the annealing temperature. There are SiO₂ layers at the interface of MoSi₂ film evaporated at room temperature and the thermal diffusion of Si was interrupted by the layers. However, the thin films with the substrate temperature of 400℃ have growned to the MoSi₂ with columnar structure. We measured the electrical properties, the sheet resistance and Schottky barrier height, of MoSi₂ thin films. The sheet resistance was depended upon the grain size and the smallest value was 2.1Ω/□ at room temperature after annealing at 700℃ for 1 min. The Schottky barrier height was independed upon the annealing temperature and ambient, and was about 0.56eV for hexagonal- and tetragonal-MoSi₂.
가공열처리에 의한 Ti-6Al-4V 합금의 조직 및 경도 변화에 대한 연구
서동이,김성진,한전건 成均館大學校 科學技術硏究所 1988 論文集 Vol.39 No.2
The microstructure and hardness change by thermomechanical processing was studied in the temperature range of α+β phase(800℃) and above the β-transus temperature(1,050℃) respectively in Ti-6A1-4V alloy. Equiaxed a morphology could be obtained through hot rolling and annealing at 800℃ while a lamellar structure was produced only by solution treatment followed by annealing without hot rolling. The morphology change from lamellar a to equiaxed a was Promoted with increasing the degree of deformation. Thermome chanical processing above β transus temperature resulted in the combined structure of serrated α, acicular a and fine lamellar structure. It was also found that prolonged annealing could induce the formation of egaiaxed α at highly stressed area. Hardness appeared to be higher in lamellar a structure than equiaxed a structure.
Han, Yo-Han,Kee, Ji-Ye,Park, Seong-Hwan,Mun, Jeong-Geon,Jeon, Hee-Dong,Park, Jinbong,Zou, Qin-Peng,Liu, Xiang-Qian,Hong, Seung-Heon Elsevier 2019 Phytomedicine Vol.62 No.-
<P><B>Abstract</B></P> <P><B>Background</B></P> <P>Although rubrofusarin-6-β-gentiobioside (RFG), which is a component of <I>Cassiae tora</I> seed, could likely regulate hyperlipidemia, its anti-obesity effect and related mechanism have not been elucidated.</P> <P><B>Purpose</B></P> <P>The aim of this study was to examine whether RFG can ameliorate obesity and the mechanism of lipid accumulation regulated by RFG.</P> <P><B>Study design</B></P> <P>In <I>in vitro</I> experiments, we confirmed the anti-adipogenic effect of RFG using 3T3-L1 cells and human adipose mesenchymal stem cells (hAMSCs). To confirm the anti-obesity effect, High-Fat Diet (HFD)-induced obese mice were selected as a model.</P> <P><B>Methods</B></P> <P>We investigated anti-adipogenic effects of RFG using MTS assay, Oil Red O Staining, real-time RT-PCR, western blot analysis, and immunofluorescence staining. The anti-obesity effect of RFG was confirmed in HFD-induced mice model using hematoxylin and eosin staining and serum analysis.</P> <P><B>Results</B></P> <P>RFG inhibited lipid accumulation in 3T3-L1 cells and hAMSCs by reducing expression of mammalian targets of rapamycin (mTOR), peroxisome proliferator-activated receptor (PPAR)γ, and CCAAT-enhancer binding protein (C/EBP)α. RFG phosphorylated AMP-activated protein kinase (AMPK) in a liver kinase B (LKB) 1-independent manner. Moreover, the anti-adipogenic effect of RFG was blocked by AMPK inhibitor. These results suggest that RFG inhibits lipid accumulation via AMPK signaling. Furthermore, RFG reduced the body weight, size of epididymal white adipose tissue (eWAT), and fatty liver in the mice. RFG also suppressed levels of adipogenic factors PPARγ, C/EBPα, FAS, LPL, and aP2) by activating AMPK in the eWAT and liver.</P> <P><B>Conclusion</B></P> <P>RFG can ameliorate obesity, and thus, could be used as a therapeutic agent for treating obesity.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Han, Seulgi,Hwang, Byung Woo,Jeon, Eun Young,Jung, Dooyup,Lee, Geon Hui,Keum, Do Hee,Kim, Ki Su,Yun, Seok Hyun,Cha, Hyung Joon,Hahn, Sei Kwang American Chemical Society 2017 ACS NANO Vol.11 No.10
<P>The recent progress in photonic nanomaterials has contributed greatly to the development of photomedicines. However, the finite depth of light penetration is still a serious limitation, constraining their clinical applications. Here, we developed a. poly(allylamine) (PAAm)-modified upconversion nanoparticle/hyaluronate rose bengal (UCNP/PAAm/HA-RB) conjugate complex for photochemical bonding of deep tissue with near-infrared (NIR) light illumination. Compared to the conventional invasive treatment via suturing and stapling, the UCNP/PAAm/HA-RB conjugate complex could be noninvasively delivered into the deep tissue and accelerate the tissue bonding upon NIR light illumination. HA in the outer layer of the complex facilitated the penetration of RB into the collagen layer of the dermis. The NIR light triggered UCNP of NaYF4: Yb/Er (Y:Yb:Er = 78:20:2) in the complex to illuminate visible green light under the skin tissue. The activated RB in the HA-RB conjugate by the green light induced radical formation for the cross linking of incised collagen matrix. An in vitro light propagation test and collagen fibrillogenesis analysis, an in vivo animal tissue bonding test, and an ex vivo tensile strength test of dissected skin tissues confirmed the successful photochemical tissue bonding effect of the UCNP/PAAm/HA-RB conjugate complex.</P>
Han, Chang Yeob,Ki, Sung Hwan,Kim, Young Woo,Noh, Kyoung,Lee, Da Yeon,Kang, Bomi,Ryu, Jae-Ha,Jeon, Raok,Kim, Eun Hyun,Hwang, Se Jin,Kim, Sang Geon Mary Ann Liebert, Inc 2011 ANTIOXIDANTS AND REDOX SIGNALING Vol.14 No.2
<P>Hepatic steatosis, a hepatic component of metabolic syndrome, is common and may progress to steatohepatitis and cirrhosis. The liver X receptor-α (LXRα)-sterol regulatory element binding protein-1c (SREBP-1c) pathway plays a key role in hepatic steatosis. This study investigated the potential of ajoene, a stable garlic by-product, to inhibit high fat diet (HFD)-induced hepatic steatosis and the underlying mechanism. Ajoene treatment attenuated fat accumulation and induction of lipogenic genes in the liver of HFD-fed mice. Blood biochemical analyses and histopathologic examinations showed that ajoene prevented liver injury with the inhibition of oxidative stress, as evidenced by thiobarbituric acid reactive substances formation and nitrotyrosinylation. Moreover, ajoene treatment inhibited LXRα agonist (T0901317)-mediated SREBP-1c activation, and transactivation of the lipogenic target genes in hepatocytes. Ajoene was found to activate AMP-activated protein kinase (AMPK) via LKB1, responsible for the inhibition of p70 ribosomal S6 kinase-1 (S6K1). The ability of ajoene to repress T0901317-induced SREBP-1c expression was antagonized by inhibition of AMPK or activation of S6K1, supporting the role of these kinases in the antisteatotic effect. Our results demonstrate that ajoene has an effect of activating AMPK through LKB1 and inhibit S6K1 activity, contributing to the prevention of SREBP-1c-mediated hepatic lipogenesis via the inhibition of LXRα activity.</P>
Photo-annealed amorphous titanium oxide for perovskite solar cells
Jeon, Jae Bum,Kim, Byeong Jo,Bang, Gi Joo,Kim, Min-cheol,Lee, Dong Geon,Lee, Jae Myeong,Lee, Minho,han, Hyun Soo,Boschloo, Gerrit,Lee, Sangwook,Jung, Hyun Suk The Royal Society of Chemistry 2019 Nanoscale Vol.11 No.41
<P>Electron selective layers are important to the efficiency, stability and hysteresis of perovskite solar cells. Photo-annealing is a low-cost, roll-to-roll-compatible process that can be applied to the post-treatment fabrication of sol-gel based metal oxide layers. Here, we fabricate an amorphous titanium oxide electron selective layer at a low temperature in a dry atmosphere using a UV light annealing system and compare it with a thermal annealing process. Active oxygen species are created by using UV light to promote hydrolysis and condense the TiO2 precursor, which removes organic ligands effectively. The photo-annealed TiO2-based perovskite solar cell has a power conversion efficiency of 19.37% without hysteresis.</P>
한병호 ( Han Byeong Ho ),조동휘 ( Jo Dong Hwi ),전태희 ( Jeon Tae Hui ),주기중 ( Ju Gi Jung ),이중건 ( Lee Jung Geon ),이종수 ( Lee Jong Su ),송갑영 ( Song Gab Yeong ) 대한내과학회 2003 대한내과학회지 증례 특집호 65-5 부록3 Vol.0 No.-
Typhoid fever often manifests hepatic involvement but pleural involvement has rarely been reported to occur as a complication of typhoid fever. One case of typhoid pleurisy, in which Salmonella was isolated from the blood, is presented with the brief revi