Calculations of AC magnetic losses from the experimental field profiles in various types of coated conductors under applied fields

Yoo, J,Lee, S,Jung, Y,Lee, J,Youm, D,Ha, H,Kim, H,Ko, R-K,Oh, S Institute of Physics 2008 Journal of physics. Conference series Vol.97 No.1

<P>We measured the field profiles, <I>H</I>(<I>x,H</I><SUB>a</SUB>) s, near the surface of coated conductors (CCs) by using the scanning Hall probe method. The samples were SmBCO-CC tape fabricated by co-evaporation method and YBCO-CC tape fabricated by PLD method. The applied fields, <I>H</I><SUB>a</SUB>s, were decreased from <I>H</I><SUB>peak</SUB>to -<I>H</I><SUB>peak</SUB> stepwise. From the values of <I>H</I>(<I>x,H</I><SUB>a</SUB>), we calculated the current profiles, <I>J</I>(<I>x,H</I><SUB>a</SUB>) s, by the inversion method. From the values of <I>J</I>(<I>x,H</I><SUB>a</SUB>) and the corresponding flux densities, we calculated the hysteretic energy losses per cycle, <I>Q</I><SUB>M</SUB>s, for various <I>H</I><SUB>peak</SUB>s. From the values of <I>Q</I><SUB>M</SUB>, we calculated the characteristic functions, <I>g</I>s, by using the relation, <I>g</I>= π<I>Q</I><SUB>M</SUB>/μ<SUB>0</SUB><I>I</I><SUP>2</SUP><SUB>c</SUB>. Here, <I>I</I><SUB>c</SUB> is the critical current. For the range of <I>H</I><SUB>peak</SUB>/<I>H</I><SUB>c</SUB>≤ 3, the <I>g</I>-values of SmBCO CC tape were larger than those of YBCO CC tape. However, for the range of <I>H</I><SUB>peak</SUB>/<I>H</I><SUB>c</SUB> ≥ 3, the <I>g</I>-values of SmBCO CC tape were smaller than those of YBCO CC tape. When <I>H</I><SUB>peak</SUB>/<I>H</I><SUB>c</SUB> = 3, both sample show almost same value of <I>g.</I>However we found qualitatively different <I>J–B</I> hysteretic curves for both samples. We also compared our <I>g</I>-values with other <I>g</I>-values, which were directly measured by energy loss experiments. Our <I>g</I>-values of YBCO CC tapes were basically similar to the Brandt's theoretical values of <I>g</I> in the most range of <I>I</I><SUB>peak</SUB> in our measurements.</P>

Validation of egg yolk antibody based C-ELISA for avian influenza surveillance in breeder duck

Jeong, O.M.,Kim, M.C.,Kang, H.M.,Ha, G.W.,Oh, J.S.,Yoo, J.E.,Park, C.H.,Kwon, J.S.,Pack, M.R.,Kim, H.R.,Kim, Y.J.,Kwon, J.H.,Lee, Y.J. Elsevier Scientific Pub. Co 2010 Veterinary microbiology Vol.144 No.3

Active surveillance for avian influenza virus (AIV) has expanded from chicken to various poultry species including duck. To further effective antibody screening in laying breeder ducks, we validated the egg yolk antibody as alternative source to serum for AIV antibody. Sera and eggs were collected at weekly intervals after two types of AIV vaccination, H5N3 and H9N2. The antibody levels were determined by an agar gel immunodiffusion (AGID) test, haemagglutination inhibition (HI) test and the competitive enzyme-linked immunosorbent assay (C-ELISA). AGID test did not detect antibodies in egg yolk, and the agreement between AGID test and either HI test or C-ELISA in serum was slight and fair based on kappa statistics (kappa value (κ)@?0.19 in H5N3 group and κ@?0.37 in H9N2 groups). However, there was almost perfect agreement between HI test and C-ELISA (κ>0.9 in all group). The C-ELISA was as sensitive and specific as the HI test, and could be used as a pre-screening test for the detection of type A avian influenza virus antibody. Comparison was made between egg yolk and serum antibody titers by a regression analysis. A high correlation was observed between serum and yolk antibody titers (r=0.8762 for H5N3 and 0.8914 for H9N2 in HI test; r=1 for H5N3 and 0.9686 for H9N2 in ELISA test), although egg yolk antibodies were detected later and remained lower levels than serum antibodies. In field trials involving 54 duck flocks, the positive rate of egg yolk and serum samples showed agreement for the detection of AIV antibody. We concluded that as an alternative to serum, antibody monitoring of laying breeder duck using egg yolk with C-ELISA is feasible and is recommended.

Effect of Si interlayer thickness and post-metallization annealing on Ge MOS capacitor on Ge-on-Si substrate

Yoo, O.S.,Oh, J.,Kang, C.Y.,Lee, B.H.,Han, I.S.,Choi, W.H.,Kwon, H.M.,Na, M.K.,Majhi, P.,Tseng, H.H.,Jammy, R.,Wang, J.S.,Lee, H.D. Elsevier Sequoia 2008 Materials science & engineering. B, Advanced funct Vol.154 No.-

We demonstrated the effect of post-metallization annealing and Si interlayer thickness on Ge MOS capacitor on Ge-on-Si substrate with HfO<SUB>2</SUB>/TaN. Ge outdiffusion and oxygen interdiffusion were completely suppressed by thick Si interfacial layer. As a result, formation of insufficient low-k Ge oxides was effectively inhibited. It is confirmed that gate current of Si passivated Ge MOS was decreased by Si IL and decrease of gate current, J<SUB>g</SUB> is saturated after Si IL of 2nm. It was also observed that when Si IL is thick enough to restrict Ge outdiffusion, increase of J<SUB>g</SUB> is not due to the temperature-induced Ge outdiffusion but due to the partial crystallization of HfO<SUB>2</SUB> at higher annealing temperature.

보건소 건강생활실천사업에 대한 이용자의 서비스 만족도

김수현,김지혜,박지현,손햇님,송준영,유현진,이소연,이주희,이지은,전소현 이화여자대학교 간호과학대학 2014 이화간호학회지 Vol.- No.48

Purpose : The purpose of this study is to identify satisfaction of adults who participate in healthy life practicing programs which are being provided by public health care centers. Method : Data were drawn from 129 adults who have utilized healthy life practicing programs regarding exercise, nutrition, and non-smoking offered by 2 public health centers in Seoul, using a structured questionnaire from 18th, October 2013 to 19th, November 2013. Descriptive statistics, t-test and ANOVA with Scheffe’s test were applied for data analyses using SPSS Statistics 21.0. Results : There were significant differences in satisfaction with healthy life practicing programs according to sex(F=6.848, p=.010), education level(F=5.289, p=.023), and age(F=5.950, p=.003). Also, satisfaction with healthy life practicing programs was significantly associated with degree of muscle strength exercise(F=4.881, p=.009). Satisfaction with exercise program was higher than satisfaction with nutrition healthy life practicing programs(t=5.997, p=.003). Conclusion : The degree of satisfaction with healthy life practicing programs was different according to participants’ socio-demographic characteristics. Therefore, providers of healthy life practicing programs need to consider sex, age, and educational level of program participants to improve satisfaction with healthy life practicing programs.

An exploration of the antioxidant effects of garlic saponins in mouse-derived C2C12 myoblasts

Kang, J. S.,Kim, S. O.,Kim, G.-Y.,Hwang, H. J.,Kim, B. W.,Chang, Y.-C.,Kim, W.-J.,Kim, C. M.,Yoo, Y. H.,Choi, Y. H. Spandidos Publications 2016 INTERNATIONAL JOURNAL OF MOLECULAR MEDICINE Vol.37 No.1

<P>In this study, we aimed to confirm the protective effects of garlic saponins against oxidative stress-induced cellular damage and to further elucidate the underlying mechanisms in mouse-derived C2C12 myoblasts. Relative cell viability was determined by 3-(4.5-dimethylthiazol-2-yl)-2.5 diphenyltetrazolium bromide assay. Comet assay was used to measure DNA damage and oxidative stress was determined using 2 ',7 '-dichlorofluorescein diacetate to measure intracellular reactive oxygen species (ROS) generation. Western blot analysis and small interfering RNA (siRNA)-based knockdown were used in order to investigate the possible molecular mechanisms. Our results revealed that garlic saponins prevented hydrogen peroxide (H2O2)-induced growth inhibition and exhibited scavenging activity against intracellular ROS. We also observed that garlic saponins prevented H2O2-induced comet tail formation and decreased the phosphorylation levels of gamma H2AX expression, suggesting that they can prevent H2O2-induced DNA damage. In addition, garlic saponins increased the levels of heme oxygenase-1 (HO-1), a potent antioxidant enzyme associated with the induction and phosphorylation of nuclear factor erythroid 2-related factor 2 (Nrf2) and the translocation of Nrf2 from the cytosol into the nucleus. However, the protective effects of garlic saponins on H2O2-induced ROS generation and growth inhibition were significantly reduced by zinc protoporphyrin IX, an HO-1 competitive inhibitor. In addition, the potential of garlic saponins to mediate HO-1 induction and protect against H2O2-mediated growth inhibition was adversely affected by transient transfection with Nrf2-specific siRNA. Garlic saponins activated extracellular signal-regulated kinase (ERK) signaling, whereas a specific ERK inhibitor was able to inhibit HO-1 upregulation, as well as Nrf2 induction and phosphorylation. Taken together, the findings of our study suggest that garlic saponins activate the Nrf2/HO-1 pathway by enabling ERK to contribute to the induction of phase II antioxidant and detoxifying enzymes, including HO-1 in C2C12 cells.</P>

Dipeptidyl petidase-IV inhibitor (gemigliptin) inhibits tunicamycin-induced endoplasmic reticulum stress, apoptosis and inflammation in H9c2 cardiomyocytes

Hwang, H.J.,Jung, T.W.,Ryu, J.Y.,Hong, H.C.,Choi, H.Y.,Seo, J.A.,Kim, S.G.,Kim, N.H.,Choi, K.M.,Choi, D.S.,Baik, S.H.,Yoo, H.J. North-Holland 2014 Molecular and cellular endocrinology Vol.392 No.1

The direct effects of dipeptidyl peptidase-IV (DPP-IV) inhibitors on endoplasmic reticulum (ER) stress-induced apoptosis and inflammation in cardiomyocytes have not been elucidated. H9c2 cell viability, which was reduced by tunicamycin, was increased after DPP-IV inhibitor gemigliptin treatment. Gemigliptin significantly decreased the tunicamycin-mediated increase in glucose regulated protein 78 (GRP78) expression and ER stress-mediated signaling molecules such as protein kinase RNA-like endoplasmic reticulum kinase (PERK)/C-EBP homologous protein (CHOP) and inositol-requiring enzyme 1α (IRE1α)/c-Jun N-terminal kinase (JNK)-p38. Furthermore, gemigliptin effectively induced Akt phosphorylation in a dose-dependent manner. Using flow cytometry and Hoechst staining, we showed that treatment with Akt inhibitor significantly blocked the anti-apoptotic effects mediated by gemigliptin. The reduction in tunicamycin-induced GRP78 level and PERK/CHOP pathway activity by gemigliptin was reversed after treatment with Akt inhibitor. In conclusion, gemigliptin effectively inhibited ER stress-induced apoptosis and inflammation in cardiomyocytes via Akt/PERK/CHOP and IRE1α/JNK-p38 pathways, suggesting its direct protective role in cardiovascular diseases.

Effects of Egg Yolk Antibodies Produced in Response to Different Antigenic Fractions of E. coli O157:H7 on E. coli Suppression

Chae, H.S.,Singh, N.K.,Ahn, C.N.,Yoo, Y.M.,Jeong, S.G.,Ham, J.S.,Kim, D.W. Asian Australasian Association of Animal Productio 2006 Animal Bioscience Vol.19 No.11

The objective of this research was to provide the characterization and method for producing anti-E. coli O157:H7 antibodies in egg-laying hens and to determine if the antibody can restrain the proliferation of E. coli O157:H7 in-vitro. Selected antigenic fractions (whole cell, outer membrane protein and lipopolysaccharide (LPS)) from E. coli O157:H7 were injected to hens in order to produce anti-E. coli O157:H7 antibodies. The immune response and the egg yolk antibodies of laying hens against the whole cell, outer membrane protein and LPS antigens were monitored by ELISA. The level of antibodies against whole cell antigen monitored through ELISA sharply increased after the initial immunization, and it was found to be maximum on day 49 however, the level was maintained up to day 70. Antibodies (5 mg/ml) directed against the whole cell inhibited E. coli proliferation 10-13 times more than outer membrane protein or LPS. The antibody response against the whole cell antigens appeared to have higher activity in restraining the proliferation of E. coli O157:H7 than antibody against outer membrane protein or LPS. Results reflected that increasing the IgY's in the egg yolk could prevent greater economic losses due to human and animal health from pathogenic bacteria i.e. E. coli O157:H7.

남자대학생의 정신건강, 부모양육태도, 애착이 도박중독에 미치는 영향

김혜진,박재희,유지원,이수현,이지은,임소정,장우주,지연주,최민정,김석선,박향진 이화여자대학교 간호과학대학 2016 이화간호학회지 Vol.- No.50

Objectives: The purpose of this research was to identify the effect of mental health, parenting attitude and attachment on gambling addiction severity among male college students. Methods: Subjects of the research were 292 students recruited from colleges in Seoul, Korea. The questionnaires were composed of CPGI, DASS-21, PBI, ECR-R. The data was statistically analyzed by Chi-square, ANOVA, Scheffe test and Pearson’s correlation. Results: The proportion of moderate-risk gambling and high-risk gambling group was reported 28.1%. There a statistically significant difference between gambling addiction severity groups in Anxiety(F=3.19, p<.05). Statistically significant linear relationship was found between Anxiety and gambling addiction score(r=.15, p<.05). There was statistically significant difference between gambling addiction severity groups in Caring(F=4.74, p<.01). Statistically significant linear relationship was found between Caring and gambling addiction score(r=-2.14, p<.01). There was statistically significant difference between gambling addiction severity groups in Overprotection(F=4.74, p<.01). Statistically significant linear relationship was examined between Overprotection and gambling addiction score(r=.20, p<.01). Significant difference was examined between gambling addiction severity in Attachment Anxiety(F=3.76, p<.05). Attachment Anxiety showed significant linear relationship with gambling addiction score(r=-.17, p<.01). Significant differences were examined between gambling addiction severity in Attachment avoidance (F=3.46, p<.05). Attachment avoidance showed no significant relationship with gambling addiction score(r=-.09, p=.12). Conclusions: This study showed the effect of mental health, parenting attitude and attachment on gambling addiction severity among male college students. Based on the result, it is recommend for nurses to develop intervention to prevent gambling addiction among college students by lowering anxiety, stabilizing attachment through desirable caring attitude from parents.

Role of n-type seed-layers in microstructural evolution of intrinsic nanocrystalline silicon and solar cell performance

Lee, J.E.,Ahn, S.,Park, J.H.,Yoo, J.,Yoon, K.H.,Kim, D.,Cho, J.S. Elsevier 2013 CURRENT APPLIED PHYSICS Vol.13 No.7

Nanocrystalline silicon (nc-Si:H) thin-film n-i-p solar cells were constructed on flexible stainless steel substrates by plasma-enhanced chemical vapor deposition. Influence of the n-type seed-layer on the microstructural evolution of the subsequent intrinsic nc-Si:H absorbers and the resultant performance of nc-Si:H solar cells was investigated. The crystalline volume fraction of the seed-layer can be effectively controlled by varying the hydrogen (H<SUB>2</SUB>) to silane (SiH<SUB>4</SUB>) gas flow ratio. Defect-dense amorphous regions were observed at the initial growth stage of the i-layers deposited on low crystalline volume fraction (X<SUB>c</SUB><SUP>n</SUP>) n-type seed-layers. Increasing the X<SUB>c</SUB><SUP>n</SUP> reduced the amorphous region at the n/i interface of the i nc-Si:H layers, evidenced by Raman scattering and transmission electron microscopy (TEM) measurements. Elimination of the defect-rich amorphous region within the i-layer by depositing the nc-Si:H solar cells on highly crystalline seed-layer caused significant improvements in the short circuit current density (J<SUB>sc</SUB>) and fill factor (FF). This is mainly due to the enhancement of long-wavelength light response and extraction efficiency of photo-carrier charges. The nc-Si:H solar cells prepared on a highly crystalline seed-layer (X<SUB>c</SUB><SUP>n</SUP>=73%) exhibited a 65.6% higher conversion efficiency than those on the n-type amorphous layers (X<SUB>c</SUB><SUP>n</SUP>=0%).

22 H. pylori 감염시 NSAID의 항암 효과에 대한 실험적 증거

김도현 ( D. H. Kim ),이기명 ( K. M. Lee ),박현진 ( H. J. Park ),최찬임 ( C. I. Chor ),원명이 ( M. I. Won ),김인혜 ( I. H. Kim ),정재연 ( J. H. Jung ),유병무 ( B. M. Yoo ),김진홍 ( J. H. Kim ),조성원 ( S. W. Cho ),함기백 ( K. B. Hahm 대한소화기학회 2002 대한소화기학회 추계학술대회 Vol.2002 No.-