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정태성(Tae Sung Jeong),제갈소영(Soyoung Jekal),임성현(S. H. Rhim),홍순철(S. C. Hong) 한국자기학회 2017 韓國磁氣學會誌 Vol.27 No.2
Recent study shows that ordered alloy of L1₂ XPt₃ (M= V, Cr, Mn, Co, and Fe) exhibits various magnetic phases such as ferromagnetic-to-antiferromagnetic transition at the MnPt₃ surface. Moreover, it has been argued that CrPt₃, in particular, possess large magnetocrystalline anisotropy and Kerr rotation with possible violation of Hund’s rule. As such, we extend our work to thickness dependence of the magnetic structure of CrPt₃ thin film using density functional theory. Magnetic ground state of the bulk CrPt₃ turns out to be ferromagnetic (FM), where other magnetic phases such as A-type (A-AF), C-type (C-AF), and G-type antiferromagnetic (GAF) state have higher total energies than FM by 0.517, 0.591, and 0.183 eV, respectively, and magnetic moments of Cr in bulk are respectively 2.807 (FM), 2.805 (A-AF), 2.794 (C-AF) and 2.869 μ<SUB>B</SUB> (G-AF). We extend our study to CrPt₃(001) thin films with CrPtand Pt-termination. The thickness and surface-termination dependences of magnetism are investigated for 3-9 monolayers (ML), where different magnetic phases from bulk emerge: C-AF for CrPt-terminated 3ML and G-AF for Pt-terminated 5ML have energy difference relative to FM by 8 and 54 meV, respectively. Furthermore, thickness- and surface-termination-dependent magnetocrystalline anisotropies of the CrPt₃(001) films are discussed.
Lee, Tae Gyoung,Ranot, Mahipal,Seong, Won Kyung,Jung, Soon-Gil,Kang, W N,Joo, J H,Kim, C-J,Jun, B-H,Kim, Youngha,Zhao, Y,Dou, S X IOP Publishing Ltd 2009 Superconductor science & technology Vol.22 No.4
<P>We report on the fabrication of superconducting MgB<SUB>2</SUB> thin films on textured Cu(100) tape under low pressure and temperature by using a hybrid physical–chemical vapor deposition (HPCVD) technique to explore the possible broad range of deposition. Thermodynamic calculations for the Mg–B system have been carried out and the pressure–temperature phase diagram was obtained. Our results demonstrate that the deposition of superconducting MgB<SUB>2</SUB> films is possible beyond the theoretically calculated growth window, where the sublimation of Mg is taking place. The structural and microstructural investigations reveal that MgB<SUB>2</SUB> films are <I>c</I>-axis-oriented normal to the substrate. The highest <I>J</I><SUB>c</SUB> of ∼1.34 × 10<SUP>5</SUP> A cm<SUP>−2</SUP> at 5 K under 3 T is obtained for the film grown at 460 °C. The critical current density (<I>J</I><SUB>c</SUB>) and flux pinning force density (<I>F</I><SUB>p</SUB>) of MgB<SUB>2</SUB> films are enhanced with decreasing growth temperature. This could be attributed to the high density of grain boundaries which may act as effective flux pinning centers. These findings suggest an alternative route to fabricate MgB<SUB>2</SUB> tapes at low temperature for large scale applications.</P>
Hwangbo, C,Tae, N,Lee, S,Kim, O,Park, O K,Kim, J,Kwon, S-H,Lee, J-H Macmillan Publishers Limited 2016 Oncogene Vol.35 No.3
<P>Syntenin, a tandem PDZ domain containing scaffold protein, functions as a positive regulator of cancer cell progression in several human cancers. We report here that syntenin positively regulates transforming growth factor (TGF)-beta 1-mediated Smad activation and the epithelial-to-mesenchymal transition (EMT) by preventing caveolin-1-mediated internalization of TGF-beta type I receptor (T beta RI). Knockdown of syntenin suppressed TGF-beta 1-mediated cell migration, transcriptional responses and Smad2/3 activation in various types of cells; however, overexpression of syntenin facilitated TGF-beta 1-mediated responses. In particular, syntenin knockdown abolished both the basal and TGF-beta 1-mediated repression of E-cadherin expression, as well as induction of vimentin expression along with Snail and Slug upregulation; thus, blocking the TGF-beta 1-induced EMT in A549 cells. In contrast, overexpression of syntenin exhibited the opposite effect. Knockdown of syntenin-induced ubiquitination and degradation of T beta RI, but not TGF-beta type II receptor, leading to decreased T beta RI expression at the plasma membrane. Syntenin associated with T beta RI at its C-terminal domain and a syntenin mutant lacking C-terminal domain failed to increase TGF-beta 1-induced responses. Biochemical analyzes revealed that syntenin inhibited the interaction between caveolin-1 and T beta RI and knockdown of syntenin induced a massive internalization of T beta RI and caveolin-1 from lipid rafts, indicating that syntenin may increase TGF-beta signaling by inhibiting caveolin-1-dependent internalization of T beta RI. Moreover, a positive correlation between syntenin expression and phospho-Smad2 levels is observed in human lung tumors. Taken together, these findings demonstrate that syntenin may act as an important positive regulator of TGF-beta signaling by regulating caveolin-1-mediated internalization of T beta RI; thus, providing a novel function for syntenin that is linked to cancer progression.</P>
Effect of weak interlayer coupling on critical fluctuation in high $T_c$ superconductors
Kim, Jin-Tae,Kang, W.N.,Chung, S.H.,Ha, D.H.,Yoo, K.H.,Kim, M.S.,Lee, Sung-Ik,Park, Y.K.,Park, J.C. The Korean Superconductivity Society 1999 Progress in superconductivity Vol.1 No.1
The magnetization and/or resistivity of high $T_c$ superconductors ($YBa_2Cu_3O_{7-\delta}$(YBCO) single crystal, $Bi_2Sr_2CaCu_2O_8$ (Bi-2212) single crystal, $Tl_2Ba_2CaCu_2O_8$ (Tl-2212) film, $HgBa_2Ca_2Cu_3O_8$ (Hg-1223) film) have been measured as a function of magnetic field H and temperature T. The extracted fluctuation part of the magnetization and conductivity exhibits a critical behavior consistent with the three-dimensional XY model. The dynamic critical exponent z does not sensitively vary with a type of the superconductors. The value of z ranges from 1.5 to $1.8{\pm}0.1$. However, the static critical exponent ${\nu}$ is the most largely increased in Tl-2212 that has a weaker interlayer coupling strength than YBCO; the value of ${\nu}$ is 0.669, 0.909, 1.19, and 1.338 for YBCO, Bi-2212, Hg-1223, and Tl-2212 respectively. The results indicate that the weak interlayer coupling along the c-axis of high $T_c$ superconductors near $T_c$ does not influence the dynamic critical exponent z (the same value of superfluid $^4He$), but significantly increases the static critical exponent ${\nu}$.
비대칭적인 열 및 물질전달이 있는 수직채널에서의 자연대류 해석
태춘섭,이충구 충북대학교 건설기술연구소 1998 建設技術論文集 Vol.17 No.1
This study aims to investigate theoretically the role of heat and mass transfer, in connection with the vaporisation of thin liquid film on the lower girt of inside channel, in natural convection flows driven by the buoyancy forces of thermal and mass diffusion. The upper surface provides a uniform heat flux, though asymmetric. The FDM(Finite Difference Method) was used to solve the governing equations of laminar natural connective channel flow. The relationship between the dimensionless flow rate and Grashof number was presented graphically in terms of the ratio of wet- or dry-pant channel length to the heated length. The result of this study elucidated the important role of liquid film in laminar natural connective flows.
박종성,황성준,이승관,이창규,이국성,강영태 高麗大學校 倂設 保健大學 保健科學硏究所 1994 保健科學論集 Vol.20 No.1
Comparison of methods studies should compare results by new or proposed method with those by a reference quality method or other generally accepted analytical method for which the performance is documented. The least squares method is frequently used to calculate the slope and intercept of the best line through a set of data points. However, least squares regression slopes and intercepts may be incorrect if the underlying assumptions of the least squares model are not met. Latest in the line of Hitachi systems, the Hitachi 747 is a high volume, random access system. It has capabilities for running states, automatic return of samples with a smaller volume, parameters for serum/plasma and urine, and multitasking capability. We performed method comparison studies against the current method for 8 different analytes with 49 samples for each chemistry. Also, Data analysis was performed according to the Kuwa protocol. The results of statistical studies indicate an acceptable performance over a clinically relevant range. We conclude that the Hitachi 747 analyzer is a reliable, precise and accurate system for routine clinical analytes. Its convenience and simplicity make it superior to the current autoanalyzer for our clinical applications in a hospital setting.
Lyu, Seung Woo,Park, Young Min,Yang, Tae Young,Ryu, S.C.,Stevens, Ron,Park, Hong Chae Trans Tech Publications, Ltd. 2007 Key engineering materials Vol.336 No.-
<P>The dispersion and rheological behavior of aqueous alumina, zirconia, and mixed alumina/ zirconia slurries have been studied in terms of solid loading and the incorporated multiple processing additives. Darvan-C, Dynol 604, Glycerol, and PVA were used as the dispersant, surfactant, cryoprotectant, and binder, respectively. Sedimentation density increased significantly on adding the dispersant; its effectiveness was similar for both the alumina and zirconia suspensions. With further addition of binder, the sedimentation density decreased. The suspension viscosity generally behaved in an opposite manner to the sedimentation density, i.e., low sedimentation density gave high low-shear viscosity, indicative of high order structure formation in the suspended particles. Shear rate rheology of suspensions with high dispersant content showed a shear thinning but with low dispersant content (≤2 wt.%), however, it showed a shear thickening at high shear rate (>600 s-1).</P>
Tae, C. H.,Moon, C. M.,Kim, S. E.,Jung, S. A.,Eun, C. S.,Park, J. J.,Seo, G. S.,Cha, J. M.,Park, S. C.,Chun, J. Springer Science + Business Media 2017 Journal of gastroenterology Vol.52 No.7
<P>Conclusions Women, having undergone the procedure in small-to-medium-sized cities and the presence of an HRA at the index colonoscopy were found to be independent risk factors for late surveillance colonoscopy. Late surveillance is significantly predictive of subsequent HRA or CRC.</P>