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Kang, M.O.,Joo, J.,Jun, B.H.,Park, S.D.,Kim, C.S.,Kim, C.J. The Korea Institute of Applied Superconductivity a 2019 한국초전도저온공학회논문지 Vol.21 No.1
This study was carried out to investigate the effect of milling of boron (B), which is one of raw materials of $MgB_2$, on the critical current density ($J_c$) of $MgB_2$. B powder used in this study is semi-amorphous B (Pavezyum, Turkey, 97% purity, 1 micron). The size of B powder was reduced by planetary milling using $ZrO_2$ balls (a diameter of 2 mm). The B powder and balls with a ratio of 1:20 were charged in a ceramic jar and then the jar was filled with toluene. The milling time was varied from 0 to 8 h. The milled B powders were mixed with Mg powder in the composition of (Mg+2B), and the powder mixtures were uniaxially pressed at 3 tons. The powder compacts were heat-treated at $700^{\circ}C$ for 1 h in flowing argon gas. Powder X-ray diffraction and FWHM (Full width at half maximum) were used to analyze the phase formation and crystallinity of $MgB_2$. The superconducting transition temperature ($T_c$) and $J_c$ of $MgB_2$ were measured using a magnetic property measurement system (MPMS). It was found that $B_2O_3$ was formed by B milling and the subsequent drying process, and the volume fraction of $B_2O_3$ increased as milling time increased. The $T_c$ of $MgB_2$ decreased with increasing milling time, which was explained in terms of the decreased volume fraction of $MgB_2$, the line broadening of $MgB_2$ peaks and the formation of $B_2O_3$. The $J_c$ at 5 K increased with increasing milling time. The $J_c$ increase is more remarkable at the magnetic field higher than 3 T. The $J_c$ at 5 K and 4 T was the highest as $4.37{\times}10^4A/cm^2$ when milling time was 2 h. The $J_c$ at 20 K also increased with increasing milling time. However, The $J_c$ of the samples with the prolonged milling for 6 and 8 h were lower than that of the non-milled sample.
JEON, B.Y.,LEE, H‐,Y.,PARK, E‐,C.,CHOI, K.S.,JUN, J.K.,KIM, Y.,HAN, M.A.,YOON, N‐,H.,KIM, E.J.,JEON, S.M. Blackwell Publishing Ltd 2011 European journal of cancer care Vol.20 No.6
<P>JEON B.Y., LEE H‐Y., PARK E‐C., CHOI K.S., JUN J.K., KIM Y., HAN M.A., YOON N‐H., KIM E.J. & JEON S.M. (2011) <I>European Journal of Cancer Care</I><B>20</B>, 803–809</P><P><B>Satisfaction with mammography in the National Cancer Screening Programme participants of age 40s in Korea</B></P><P>The aim of this study was to evaluate satisfaction with the National Cancer Screening Programme of mammography in Korea and to examine the association between subscales of satisfaction and general satisfaction. We conducted a cross‐sectional telephone survey for women who had obtained a National Cancer Screening Programme mammographic screening at general hospitals between May and October 2008. The present study included 2005 women in their forties. We performed multivariate linear regression using dependent variable as general satisfaction and independent variables as subscales of satisfaction, such as pre‐screening information transfer, staff interpersonal skills, physical surroundings and results reporting. Participants were stratified according to the result of their mammogram as negative or positive. Mean score of satisfaction was above 2.5 of 4 for all subscales. Women who received positive results were less satisfied with all of subscale factors. Staff interpersonal skills were the most important factor that contributed to general satisfaction. Future efforts such as staff training programme of communication/attitude skills, ensuring privacy and explanation of possible discomfort of the screening would be needed.</P>
Kim, B.H.,Hong, W.G.,Moon, H.R.,Lee, S.M.,Kim, J.M.,Kang, S.,Jun, Y.,Kim, H.J. Pergamon Press ; Elsevier Science Ltd 2012 International journal of hydrogen energy Vol.37 No.19
In order to prove the existence of an optimum interlayer distance for H<SUB>2</SUB> uptake, we have obtained H<SUB>2</SUB> isotherms with respect to the interlayer distance of pillared-graphene oxide (GO) at 1.0 bar and 77 K. Interlayer distances of GO were changed by intercalation of three kinds of diaminoalkanes with a different number of carbon atoms (NH<SUB>2</SUB>(CH<SUB>2</SUB>)<SUB>n</SUB>NH<SUB>2</SUB>, n = 2, 6, 10) as pillars and changing the subsequent thermal annealing conditions. We found an optimum GO interlayer distance for maximum H<SUB>2</SUB> uptake at 6.3 A similar to the predicted distance from first-principles calculations for graphitic materials, and the value obtained from thermally modulated GO. Our results experimentally corroborate the existence of an optimum interlayer distance and demonstrate the importance of an interlayer distance for the design of materials for H<SUB>2</SUB> storage.
<i>HLA‐B*40:02:18</i>, a new <i>HLA‐B*40</i> allele
Ko, S.‐,Y.,Oh, H.‐,B.,Jun, J.‐,H.,Kwon, O.‐,J. Munksgaard 2014 Tissue antigens Vol.83 No.6
<P>The new allele <I>B*40:02</I>:<I>18</I> showed one nucleotide difference with <I>B*40:02:01</I> at codon 111 (CGC/CGT).</P>
B*39:60, a novel HLA‐B*39 allele identified by sequence‐based typing
Ko, S.‐,Y.,Oh, H.‐,B.,Heo, Y.‐,S.,Jun, J. H.,Kwon, O.‐,J. Blackwell Publishing Ltd 2011 Tissue antigens Vol.77 No.2
<P>The new allele B*39:60 showed one nucleotide difference with B*39:01:01 at codon 152 (GTG/GCG).</P>
Yu Jun Wong,Vy H. Nguyen,Hwai-I Yang,Jie Li,Michael Huan Le,Wan-Jung Wu,Nicole Xinrong Han,Khi Yung Fong,Elizabeth Chen,Connie Wong,Fajuan Rui,Xiaoming Xu,Qi Xue,Xin Yu Hu,Wei Qiang Leow,George Boon-B 대한간학회 2023 Clinical and Molecular Hepatology(대한간학회지) Vol.29 No.3
Background/Aims: Chronic hepatitis B (CHB) and fatty liver (FL) often co-exist, but natural history data of this dual condition (CHB-FL) are sparse. Via a systematic review, conventional meta-analysis (MA) and individual patient-level data MA (IPDMA), we compared liver-related outcomes and mortality between CHB-FL and CHB-no FL patients. Methods: We searched 4 databases from inception to December 2021 and pooled study-level estimates using a random- effects model for conventional MA. For IPDMA, we evaluated outcomes after balancing the two study groups with inverse probability treatment weighting (IPTW) on age, sex, cirrhosis, diabetes, ALT, HBeAg, HBV DNA, and antiviral treatment. Results: We screened 2,157 articles and included 19 eligible studies (17,955 patients: 11,908 CHB-no FL; 6,047 CHB-FL) in conventional MA, which found severe heterogeneity (I2=88–95%) and no significant differences in HCC, cirrhosis, mortality, or HBsAg seroclearance incidence (P=0.27–0.93). IPDMA included 13,262 patients: 8,625 CHB-no FL and 4,637 CHB-FL patients who differed in several characteristics. The IPTW cohort included 6,955 CHB-no FL and 3,346 CHB-FL well-matched patients. CHB-FL patients (vs. CHB-no FL) had significantly lower HCC, cirrhosis, mortality and higher HBsAg seroclearance incidence (all P≤0.002), with consistent results in subgroups. CHB-FL diagnosed by liver biopsy had a higher 10-year cumulative HCC incidence than CHB-FL diagnosed with non-invasive methods (63.6% vs. 4.3%, P<0.0001). Conclusions: IPDMA data with well-matched CHB patient groups showed that FL (vs. no FL) was associated with significantly lower HCC, cirrhosis, and mortality risk and higher HBsAg seroclearance probability.
Kim, H.,Dindulkar, S.D.,Jeong, D.,Park, S.,Jun, B.H.,Cho, E.,Jung, S. Korean Society of Industrial and Engineering Chemi 2016 Journal of industrial and engineering chemistry Vol.44 No.-
<P>A new pentacosadiynoyl cyclosophoraose (P-Cys) was synthesized using a biosourced cyclooligosac-charide with intrinsic complexation capacity. NOESY analysis revealed that switchable molecular behavior of pentacosadiynoyl moiety attached to P-Cys was dependent on the external lipophilicity. Both encapsulation by cyclosophoraose and switchable emulsification by pentacosadiynoyl moiety in P-Cys make it possible to finely formulate a nanoemulsion state for an external hydrophobic guest molecule like Sudan III. Various physicochemical properties of the emulsions of P-Cys were investigated using TEM and DLS. The results indicate that P-Cys is a useful potential platform for the encapsulating emulsification of bioactive molecules for cosmetic and pharmaceutical applications. (C) 2016 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.</P>
Effects of carbon substitution via ball-milling in MgB<sub>2</sub>
Lee, J.H.,Jun, B.H.,Kim, C.J.,Park, H.W. North-Holland 2009 Physica. C, Superconductivity Vol.469 No.15
In this study, we have synthesized the C-doped MgB<SUB>2</SUB> samples by solid-state reaction after mixing Mg powder with the attrition-milled B and C powders. The C added powders were mixed according to the nominal atomic ratio of Mg(B<SUB>1-x</SUB>C<SUB>x</SUB>)<SUB>2</SUB> with x=0, 0.005, 0.015, 0.025, and 0.05. The analysis of X-ray diffraction showed that the (110) peaks, which correspond to the lattice parameter a, were shifted to a higher angle as the increasing of carbon contents. These results indicated that the B substitution for C became more dominant at higher doping level of C. The sample having the composition of Mg(B<SUB>0.975</SUB>C<SUB>0.025</SUB>)<SUB>2</SUB> gave the best critical current density (Jc) of ∼5000Acm<SUP>-2</SUP> at 8T and 5K, as compared to the ∼1200Acm<SUP>-2</SUP> for the undoped sample.