http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Song, Hyoseok,Jeon, Heeyoung,Shin, Changhee,Shin, Seokyoon,Jang, Woochool,Park, Joohyun,Chang, Jaewan,Choi, Jae Hyoung,Kim, Younsoo,Lim, HanJin,Seo, Hyungtak,Jeon, Hyeongtag Elsevier S.A. 2016 Thin Solid Films Vol.619 No.-
<P><B>Abstract</B></P> <P>In this study, we report the effect of process conditions on the crystallinity and energy band structure of atomic layer deposition (ALD) ZrO<SUB>2</SUB> films deposited, using tris(dimethylamino) cyclopentadienyl zirconium as a precursor and ozone as a reactant. ZrO<SUB>2</SUB> films exhibited systematic changes in phase and energy band gap as a function of the ozone concentration. The crystal phase was transformed from the monoclinic phase to a tetragonal phase in the presence of higher ozone concentrations. In addition, spectroscopic ellipsometry measurements showed that the optical band gap and oxygen vacancy defects decreased with increasing ozone concentration. The valence band maximum also shifted closer to the Fermi energy level with increasing ozone concentration. The change in electronic structure driven by a high concentration of ozone led to reduced leakage current density and a high dielectric constant in the ZrO<SUB>2</SUB>-based metal-insulator-metal capacitors. These improvements were not observed for depositions performed using conventional ZrO<SUB>2</SUB> ALD with oxygen and water reactants.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We report the effect of ozone concentration on the properties of ZrO<SUB>2</SUB> thin films. </LI> <LI> The ZrO<SUB>2</SUB> at higher O<SUB>3</SUB> transformed from a monoclinic phase to a tetragonal phase. </LI> <LI> The ZrO<SUB>2</SUB> at higher O<SUB>3</SUB> concentration showed the reduced leakage current. </LI> <LI> The ZrO<SUB>2</SUB> at higher O<SUB>3</SUB> concentration showed the higher dielectric constant. </LI> </UL> </P>
An, Hyoseok,Lee, Jae Won,Lee, Hyun Ji,Seo, Yerang,Park, Honghyun,Lee, Kuen Yong Elsevier 2018 Carbohydrate polymers Vol.197 No.-
<P><B>Abstract</B></P> <P>Hyaluronate-based hydrogels have been widely exploited as synthetic extracellular matrices in many tissue engineering applications, including cartilage tissue engineering. Hyaluronate-based hydrogels are typically prepared by chemical cross-linking reactions, in which chemical reagents may induce side effects, unless they are completely removed after the cross-linking reaction. We thus suggest the utilization of hybrid materials composed of hyaluronate as a main chain and alginate for physical cross-linking to simply form hydrogels in the presence of calcium ions under physiological conditions. In this study, we hypothesized that the introduction of biomimetic peptides to hyaluronate-alginate hybrid (HAH) hydrogels could be useful to regulate the chondrocyte phenotype, including chondrogenic differentiation. HAH was modified with the arginine-glycine-aspartate (RGD) peptide as a cell–matrix interaction motif and/or histidine-alanine-valine (HAV) as a cell–cell interaction motif. The HAV peptide is known to bind to cadherin, which is a key factor involved in homophilic cell–cell interactions as well as chondrogenesis. The viability and growth of mouse chondrocytes (ATDC5 cells) increased significantly when cultured on RGD-modified HAH hydrogels. Cell aggregates formed on HAV-modified HAH hydrogels, resulting in enhanced chondrogenic differentiation via enhanced cell–cell interactions by HAV modification. Interestingly, a synergistic effect of HAV and RGD peptides within HAH hydrogels on chondrogenesis was found in 3-D experiments <I>in vitro</I>. This approach to utilizing physically cross-linkable hyaluronate-based hydrogels presenting biomimetic peptides has potential applications in tissue engineering, including cartilage regeneration.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Hyaluronate-alginate hybrid (HAH) forms a hydrogel using calcium ions. </LI> <LI> HAH gel presenting biomimetic peptides has potential in tissue engineering. </LI> <LI> Precise control of cell-matrix and cell-cell interactions of HAH hydrogel is critical. </LI> </UL> </P>
송한,황정현,Jaehee Myung,Hyoseok Seo,Hyojeong Yi,Hee-Sun Sim,Bong-Su Kim,William C. Nierman,김희남 한국분자세포생물학회 2009 Molecules and cells Vol.27 No.2
Pathogens Burkholderia pseudomallei (Bp) and Burkholderia mallei (Bm) contain a large number (> 12,000) of Simple Sequence Repeats (SSRs). To study the extent to which these features have contributed to the diversification of genes, we have conducted comparative studies with nineteen genomes of these bacteria. We found 210 genes with characteristic types of SSR variations. SSRs with nonamer repeat units were the most abundant, followed by hexamers and trimers. Amino acids with smaller and nonpolar R-groups are preferred to be encoded by the variant SSRs, perhaps due to their minimal impacts to protein functionality. A majority of these genes appears to code for surface or secreted proteins that may directly interact with the host factors during pathogenesis or other environmental factors. There also are others that encode diverse functions in the cytoplasm, and this protein variability may reflect an extensive involvement of phase variation in survival and adaptation of these pathogens.
CFD코드를 이용한 HPSI Pump Room의 화재안전성 평가
조남진(Cho, Namjin),임동수(Im, Dongsu),서효석(Seo, Hyoseok),조태연(Cho, Teayeon),윤기열(Yun, Kiyoul) 한국방재학회 2017 한국방재학회논문집 Vol.17 No.4
원전은 드물게 화재가 발생되며, 화재사고 시 원자로의 정지 유발과 동시에 안전정지 기기 등을 손상시켜 방사능 유출이라는 대규모 피해를 야기 시킬 수 있어 차별화된 화재 안전 설계 조건이 요구된다. 본 연구에서는 원전의 다양한 펌프실 중 중요 펌프의 케이블들이 관통해서 지나가는 고압안전주입펌프실에 대해서 CFD 전산코드를 통해 화재의 거동을 예측하고 안전성을 검증하고자 하였다. 고압안전주입펌프실의 화재 안전성평가를 위한 화재모델은 FDS (Fire Dynamics Simulator)를 이용하였으며 NUREG-1934, NUREG/CR-6850 등에 기초하여 화재시뮬레이션을 수행하였다. 그 결과로 화재발생 시 각 배기의 방화댐퍼닫힘 시간을 확인하였고, 케이블의 손상 시간을 평가하였으며, 이를 통해 원자력 발전소의 안전성 평가 및 확보를 위한 정보를 제공하고자 한다. Although fire accidents in nuclear power plants rarely occurs, it may cause a stoppage of a nuclear reactor and damage of safety devices and cause massive damage such as radiation leakage. Therefore, nuclear power plants require specialized fire safety design conditions. In this study, CFD code is used to predict fire behavior and verify safety for HPSI (High Pressure Safety Injection) Pump Room passing through cables of important pump among various pump rooms of nuclear power plant. Fire simulation was performed based on NUREG-1934, NUREG / CR-6850, etc. using Fire Dynamics Simulator (FDS) as a fire model for fire safety evaluation of HPSI Pump Room. As a result, the fire damper closing time of each exhaust was checked and the damage time of the cable was evaluated. This will provide information for safety assessment and assurance of nuclear power plants.