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Electrical Properties of ZrO2 and YSZ Films Deposited by Pulsed Laser Deposition
S.H. Kim,B.H. Park,D.H. Seo,D.-S. Suh,I.K. Yoo,I.R. Hwang,I.S. Byun,J.E. Lee,J.H. Lee,J.S. Choi,J.S. Kim,M.J. Lee,S. Seo,S.H. Hong,S.H. Jeon,S.-H. Kim,Y.S. Joung 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.47 No.2
Polycrystalline ZrO2 and yttria-stabilized ZrO2 thin films have been deposited on Pt/Ti/SiO2/Si substrates by pulsed-laser-deposition methods. Pt/ZrO2/Pt and Pt/YSZ/Pt capacitor structures show giant conductivity switching behaviors which can be utilized for nonvolatile memory devices. Maximum on/off ratio of 106 and good endurance even after 105 times conductivity switching are observed in a typical Pt/ZrO2/Pt whose ZrO2 film has been deposited at 100C and at an oxygen pressure of 50 mTorr. The Pt/ZrO2/Pt structure exhibits two ohmic behaviors in the low-voltage region (V < 1.4 V), depending on the value of previously applied high voltage, and Schottky-type conduction in the high-voltage region (1.4 V < V < 8.9 V). It seems that conductivity switching behaviors in our Pt/ZrO2/Pt structure result from changes in both the Schottky barrier and the bulk conductivity controlled by applied voltages. A Pt/YSZ/Pt capacitor structure has more stable reset voltage and current state than a Pt/ZrO2/Pt capacitor structure. Moreover, a Pt/YSZ/Pt capacitor structure shows higher conductivity than a Pt/ZrO2/Pt capacitor structure, which may result from substitution of Y3+ ions for Zr4+ ions.
Synergistic antibacterial effect of curcumin against methicillin-resistant Staphylococcus aureus
Mun, S.H.,Joung, D.K.,Kim, Y.S.,Kang, O.H.,Kim, S.B.,Seo, Y.S.,Kim, Y.C.,Lee, D.S.,Shin, D.W.,Kweon, K.T.,Kwon, D.Y. G. Fischer 2013 Phytomedicine Vol.20 No.8
<P>Methicillin-resistant Staphylococcus aureus (MRSA) are spread among infected patients, with infection rates increasing at an alarming rate. Furthermore, increased resistance to antibiotics has resulted in serious challenges in the treatment of infectious diseases worldwide. Under the selection pressure of exposure to antibiotics, microorganisms evolve to survive against the new conditions imposed by therapy. Therefore, there exists a need to develop alternative natural or combination drug therapies. Curcumin (CCM), a natural polyphenolic flavonoid isolated from the rhizome of a plant, Curcuma longa Linne., has been found to possess many beneficial biological activities. The aim of this study was to investigate the synergistic effect of curcumin and antibiotics as well as to determine the antibacterial activity of CCM against specific MRSA strains. The antibacterial activity of CCM was assessed by the broth microdilution method (by calculating the minimal inhibitory concentration [MIC]), checkerboard dilution test, and time-kill assay. Antimicrobial activity of CCM was observed against all tested strains. The MICs of CCM against 10 strains of S. aureus ranged from 125 to 250 mu g/ml. In the checkerboard test, CCM markedly reduced the MICs of the antibiotics oxacillin (OXI), ampicillin (AMP), ciprofloxacin (CIP), and norfloxacin (NOR) used against MRSA. The time-kill curves showed that a combined CCM and OXI treatment reduced the bacterial counts below the lowest detectable limit after 24 h. This study suggested that CCM reduced the MICs of several antibiotics tested, notably of OXI, AMP, CIP, and NOR, and that CCM in combination with antibiotics could lead to the development of new combination of antibiotics against MRSA infection. (C) 2013 Published by Elsevier GmbH.</P>
Kim, S.H.,Byun, I.S.,Hwang, I.R.,Choi, J.S.,Park, B.H.,Seo, S.,Lee, Man Jong,Seo, D.H.,Jeoung, E.J.,Suh, D.-S.,Joung, Y.S.,Yoo, I.K. Trans Tech Publications, Ltd. 2006 Key Engineering Materials Vol.306 No.-
<P>Polycrystalline ZrO2 and yttria-stablilized ZrO2 thin films have been deposited on Pt/Ti/SiO2/Si substrates by pulsed laser deposition methods. Pt/ZrO2/Pt and Pt/YSZ/Pt capacitor structures show giant conductivity switching behaviors which can be utilized for nonvolatile memory devices. Maximum on/off ratio of 106 and good endurance even after 105 times conductivity switching are observed in a typical Pt/ZrO2/Pt whose ZrO2 film has been deposited at 100 °C and an oxygen pressure of 50 mTorr. The Pt/ZrO2/Pt structure exhibits two ohmic behaviors in the low voltage region (V < 1.4 V) depending on the value of previously applied high voltage and Schottky-type conduction in the high voltage region (1.4 V < V < 8.9 V). It seems that conductivity switching behaviors in our Pt/ZrO2/Pt structure result from the changes in both the Schottky barrier and the bulk conductivity controlled by applied voltages. A Pt/YSZ/Pt capacitor structure has more stable reset voltage and current state than a Pt/ZrO2/Pt capacitor structure. Moreover, a Pt/YSZ/Pt capacitor structure shows higher Conductivity than a Pt/ZrO2/Pt capacitor structure, which may result from substitution of Y3+ ions for Zr4+ ions.</P>
임경순,진동일,김대경,김성우,정소용,최화식 한국가축번식학회 1998 Reproductive & developmental biology Vol.22 No.1
This experiment was carried out to improve in vitro development of rabbit one-cell embryos to the blastocyst stage. One-cell rabbit embryos were collected at 19∼20hr after superovulation induction and incubated at 39℃ in 5% CO_(2) for 72hr. In order to find optimum conditions in medium that affects the rabbit embryo's development in vitro, RDH medium which mixed with RPMI1640, DMEM and Ham's F10 was compared with the previously reported mediums (Ham's F10 and RD) for embryo development and cell numbers. Three additives (BSA, taurine and glucose) were tested for the development of rabbit one-cell embryos in vitro. When the embryos were cultured in RDH medium, their development was markedly promoted as compared with Ham's F-10 or RD alone. Glucose exhibited no significant effects on embryo development and cell numbers. BSA appeared to promote transition from morula to blastocyst stage and taurine increased cell numbers of cultured embryos markedly regardless of mediums. BSA and taurine together in RDH medium showed the additive effects on embryo development and cell number.
한우 배최장근내 지방 함량이 한우육의 이화학적 특성에 미치는 영향
이종문,김진형,조수현,김용곤,박범영,유명모,정석근 한국동물자원과학회 2000 한국축산학회지 Vol.42 No.2
The longissimus dorsi from Hanwoo bulls (n = 90) and steers (n = 139) were separated and divided by 7 groups of different fat contents such as $lt; 2%, 2-3.9%, 4-5.9%, 6.0-7.9%, 8.0-9.9%, 10.0-11.9% and ≥ 12%, and their physicochemical and sensory characteristics were examined. As fat contents increased, the contents of moisture, protein and ash were decreased. Warner-Bratzler Shear force(WBS) was lower (4.07㎏/0.5inch²) for the loins containing ≥12% intramuscular fat than the others. There was no significant differences in water holding capacity(WHC) among the loins containing different fat contents, In sensory evaluation, beef loins with high intramuscular fat contents had high scores in juiciness, tenderness and flavor. CIE L, a and b values in meat color were high as the intramuscular fat contents increased. Therefore, technology for feeding and breeding which can increase the intramuscular fat of Hanwoo should be developed and rearing the steers rather than bulls are recommended.
최일곤,정옥진,김상렬 동아대학교 생산기술연구소 1999 生産技術硏究所硏究論文集 Vol.4 No.2
The drying properties of the urea resin moulding material was investigated according to drying temperature, drying time and recycle rate of exhausting gas in the process of drying. We obtained the following results ; water content of material decreases with increasing drying time and drying temperature, but increases with increasing recycle rate of exhausting gas. The correlation equation on water content of the urea resin moulding material was obtained through a regression analysis of experimental data.
Feasibility experiment of physics-based global electron temperature profile control in KSTAR
Kim, H.-S.,Kim, S.H.,Jeon, Y.M.,Na, Y.-S.,Bae, Y.S.,Hahn, S.H.,Joung, M.,Lee, K.D.,Han, H.S.,Woo, M.H.,Lee, T.G.,Yun, S.W.,Yoon, S.W. Elsevier 2018 Fusion engineering and design Vol.135 No.1
<P><B>Abstract</B></P> <P>KSTAR experiments have been conducted aiming at establishing a real-time control system that uses multiple actuators (NBI and ECH) to control the plasma profiles (T<SUB>e</SUB> and q profiles) and validating an applied physics-based plasma profile response model. Toward establishing the multiple plasma profile control system, the control experiment of the electron temperature profile has been performed in KSTAR as a first step. Although the plasma profile control system was in the commissioning phase, the electron temperature was feedback controlled successfully in real-time while the normalized radial profile of electron temperature remained nearly constant. In the circumstance, the implemented physics-based response model was successfully validated against control experiments with a step variation on the control target and an application of multiple actuators. The robustness of the controller is examined against an external disturbance in which a static version of the control matrix was used.</P>