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Pore formation in in situ processed MgB<sub>2</sub> superconductors
Yi, J.H.,Kim, K.T.,Jun, B.H.,Sohn, J.M.,Kim, B.G.,Joo, J.,Kim, C.J. North-Holland 2009 Physica. C, Superconductivity Vol.469 No.15
MgB<SUB>2</SUB> bulks were prepared by an in situ process which utilizes the reaction between boron and magnesium powder. The reaction time was fixed at 0.5h and the temperature was changed from 600<SUP>o</SUP>C to 1000<SUP>o</SUP>C. The density decrease due to pore formation and mass (mainly magnesium) loss during the formation reaction of MgB<SUB>2</SUB> was observed in all samples. In addition to the pore formation, a pellet expansion which can be explained by the outgrowth of MgB<SUB>2</SUB> grains was also observed. Two different mechanisms were adopted to explain the pore formation; Kirkendall pores formed at a temperature below the melting point (m.p.) of magnesium by a difference in the diffusivity between magnesium and boron, and the pores formed at a temperature above the m.p. by melting of magnesium and a capillary movement. The density, T<SUB>c</SUB> and J<SUB>c</SUB> results suggest that the current carrying capacity can be improved by a careful control of the process parameters regarding a pore evolution.
남녀 대학생의 신체만족도, 자아존중감과 우울에 대한 비교연구
김나영,김민정,김진경,박민주,박민지,이다솜,이민경,이지영,전양지,정하은 이화여자대학교 간호과학대학 2010 이화간호학회지 Vol.- No.44
The purpose of this study was to know relationship among body image and self esteem, depression obtained from male and female. Also we wanted to know what is differences between male and female groups. We intended to provide basis materials for developing programs to increase body image, self esteem and to decrease depression at the same time. Object of our study were male and female who are in collage. There were 90 people in each group. We used frequency analysis to know general characteristics, and we use frequency analysis and descriptive statistic analysis to know question distribution. We studied relationship among body image and self esteem and depression with using Spearman Correlation and analysised the differences between male and female groups with using T-test. This is the result of our research. 1. ale show higher BCS and BET scores than women. Between male and female, self-esteem have no big differences. And female is more depressive than male. 2. he two elements that body image and depression are in inverse proportion to each other in both male and female university students. 3. The two elements that self-esteem and depression are in inverse proportion to each other in both male and female university students. 4. The two elements that body image and self-esteem are in inverse proportion to each other in both male and female university students. And male have high correlation between BCS and BET, BCS and self-esteem, self-esteem and depression tha female. On the other hand, female have high correlation between BET and self-esteem, BET and depression In short, both male and female have correlation between body image, self-esteem and depression. Especially, between self-esteem snd depression have high correlation. In body image, especially female have high correlation between BET and depression. Finally we found the fact that female is more sensitively react than male about appearance.
Investigation of lauric acid dopant as a novel carbon source in MgB<sub>2</sub> wire
Lee, C.M.,Lee, S.M.,Park, G.C.,Joo, J.,Lim, J.H.,Kang, W.N.,Yi, J.H.,Jun, B.H.,Kim, C.J. North-Holland 2010 Physica. C, Superconductivity Vol.470 No.20
We fabricated lauric acid (LA) doped MgB<SUB>2</SUB> wires and investigated the effects of the LA doping. For the fabrication of the LA-doped MgB<SUB>2</SUB> wires, B powder was mixed with LA at 0-5wt.% of the total amount of MgB<SUB>2</SUB> using an organic solvent, dried, and then the LA-treated B and Mg powders were mixed stoichiometrically. The powder mixture was loaded into an Fe tube and the assemblage was drawn and sintered at 900<SUP>o</SUP>C for 3h under an argon atmosphere. We observed that the LA doping induced the substitution of C for the B sites in MgB<SUB>2</SUB> and that the actual content of C increased monotonically with increasing LA doping level. The LA-doped MgB<SUB>2</SUB> wires exhibited a lower critical temperature (T<SUB>c</SUB>), but better critical current density (J<SUB>c</SUB>) behavior in a high magnetic field: the 5wt.% LA-doped sample had a J<SUB>c</SUB> value of 5.32x10<SUP>3</SUP>A/cm<SUP>2</SUP>, which was 2.17 times higher than that of the pristine sample (2.45x10<SUP>3</SUP>A/cm<SUP>2</SUP>) at 5K and 6T, suggesting that LA is an effective C dopant in MgB<SUB>2</SUB> for enhancing the high-field J<SUB>c</SUB> performance.
Yi, J.Y.,Lee, N.H.,Chung, M.S. Academic Press, etc 2016 FOOD SCIENCE AND TECHNOLOGY -ZURICH- Vol.66 No.-
<P>The objective of this study was to characterize the inactivation effects of a pilot-scale continuous-flow intense pulsed light (IPL) system on microorganisms in untreated groundwater used in the food industry. The inactivation effects of laboratory- and pilot-scale IPL systems on murine norovirus (MNV), a human norovirus surrogate, were also investigated. Flow rates of 40, 32, 20 and 12 l/min were tested (corresponding to 89,113, 179, and 290 s of treatment time in a chamber, respectively). A 290-s pilot-scale IPL treatment at an energy dose of 14.02 J/cm(2) resulted in a 4.79-log reduction of Escherichia coli C600 in water with an initial count of 10(5)-10(6) CFU/ml, while a 270-s treatment at an energy dose of 13.05 J/cm(2) resulted in a 2.91-log inactivation of aerobic and facultative anaerobic heterotrophs in untreated groundwater with the initial count of 4.5 x 10(4) CFU/ml. An 89-s treatment at a dose of 4.30 J/cm(2) resulted in a 3.35-log inactivation of MNV in water with the initial count of 10(3)-10(4) PFU/ml. The energy dose and the inactivation level showed linearity for this system. These trends should form the basis of a large-scale IPL-based water management system with improved energy efficiency. (C) 2015 Elsevier Ltd. All rights reserved.</P>
Cho, J.,Pham, D.P.,Jung, J.,Shin, C.,Park, J.,Kim, S.,Tuan Le, A.H.,Park, H.,Iftiquar, S.M.,Yi, J. Pergamon 2016 Materials science in semiconductor processing Vol.41 No.-
In this study, we report an appreciably increased efficiency from 6% up to 9.1% of hydrogenated amorphous silicon germanium (a-SiGe:H) thin film solar cells by using a combination of different p-doped window layers, such as boron doped hydrogenated amorphous silicon (p-a-Si:H), amorphous silicon oxide (p-a-SiO<SUB>x</SUB>:H), microcrystalline silicon (p-@?c-Si:H), and microcrystalline silicon oxide (p-@?c-SiO<SUB>x</SUB>:H). Optoelectronic properties and the role of these p-layers in the enhancement of a-SiGe:H cell efficiency were also examined and discussed. An improvement of 1.62mA/cm<SUP>2</SUP> in the short-circuit current density (J<SUB>sc</SUB>) is attributed to the higher band gap of p-type silicon oxide layers. In addition, an increase in open-circuit voltage (V<SUB>oc</SUB>) by 150mV and fill factor (FF) by 6.93% is ascribed to significantly improved front TCO/p-layer interface contact.
본원 치과에 내원한 치성낭종(Odontogenic Cyst)환자에 대한 임상적 고찰
조민,이상은,류재준,김성문,임재석,김회종 大韓顎顔面成形再建外科學會 1990 Maxillofacial Plastic Reconstructive Surgery Vol.12 No.2
Odontogenic cyst has been reviewed with a report on the 193 cases clinico-statistically. We found that cysts occur frequently at third decade male as 29% and second decade female as 30%. Maxilla is prevalent site as 74.6% than mandible. Uper incisiors and lower third molars are the most prebalant teeth. Swelling is the most frequent chief complaint. After enucleating, we grafted to the cystic cavities in 10 cases.