Effects of $BaCO_3$ purity on the superconducting properties of top seeded melt growth processed $Y_{1+x}Ba_2Cu_3O_y$ superconductors

Choi, J.S.,Park, S.D.,Jun, B.H.,Han, Y.H.,Sung, T.H.,Choo, K.N.,Kim, C.J. The Korean Society of Superconductivity and Cryoge 2009 한국초전도저온공학회논문지 Vol.11 No.2

Effects of $BaCO_3$ purity on the superconducting properties of top seeded melt growth (TSMG) processed $Y_{1+x}Ba_2Cu_3O_{7-y}$ (Y1+x, x=0.1 and 0.2) superconductors were investigated. $YBa_2Cu_3O_{7-y}$ (Y123) powder prepared using $BaCO_3$ with 99.75% purity and commercially available Y123 powder of 99.9% were used for the fabrication of single Y123 grain superconductors. $T_c$ values of the Y1+x samples prepared using low purity Y123 powder were slightly lower than those of the samples prepared using a high purity powder. In addition to the lower $T_c$, an anomalous peak effect in the intermediate magnetic fields was observed in Y1+x samples prepared using the low purity $BaCO_3$ powder. The slight decrease in $T_c$ and the anomalous peak effect are ascribed to the possible incorporation of a Y123 phase with impurity elements such as strontium and calcium included in the $BaCO_3$powder of 99.7%. The result suggests that the low purity $BaCO_3$ powder of a low price can be used as a raw power for the fabrication of single grain YBCO bulk superconductors.

딥러닝 기법을 이용한 전해가공의 홀가공 특성 분석

최승건(S. G. Choi),김준영(J. Y. Kim),이은상(E. S. Lee) 한국생산제조학회 2019 한국생산제조시스템학회 학술발표대회 논문집 Vol.2019 No.5

Extensions of smooth mappings into biduals and weak continuity

Choi, Y.S.,Hajek, P.,Lee, H.J. Academic Press ; Elsevier Science B.V. Amsterdam 2013 Advances in mathematics Vol.234 No.-

We study properties of uniformly differentiable mappings between real Banach spaces. Among our main results are generalizations of a number of classical results for linear operators on L<SUB>~</SUB>-spaces into the setting of uniformly differentiable mappings. Denote by B<SUB>X</SUB> the closed unit ball of a Banach space X. Let X be a L<SUB>~,λ</SUB>-space, λ≥1, and let Y be a Banach space. Let T:B<SUB>X</SUB>→Y be a continuous mapping which is uniformly differentiable in the open unit ball of X. Assuming that T is weakly compact, then T can be extended, preserving its best smoothness properties, into the mapping from the 1λ-multiple of the unit ball of any superspace of the domain space X into the same range space Y. We also show that T maps weakly Cauchy sequences from λB<SUB>X</SUB> into norm convergent sequences in Y. This is a uniformly smooth version of the Dunford-Pettis property for the L<SUB>~,λ</SUB>-spaces. We also show that a uniformly differentiable mapping T, which is not necessarily weakly compact, still maps weakly Cauchy sequences from λB<SUB>X</SUB> into norm convergent sequences in Y, provided Y<SUP>**</SUP> does not contain an isomorphic copy of c<SUB>0</SUB>. We prove that for certain pairs of Banach spaces the completion of the space of polynomials equipped with the topology of uniform convergence on the bounded sets (of the functions and their derivatives up to order k) coincides with the space of uniformly differentiable (up to order k) mappings. Our work is based on a number of tools that are of independent interest. We prove, for every pair of Banach spaces X,Y, that any continuous mapping T:B<SUB>X</SUB>→Y, which is uniformly differentiable of order up to k in the interior of B<SUB>X</SUB>, can be extended, preserving its best smoothness, into a bidual mapping T@?:B<SUB>X^*^*</SUB>→Y<SUP>**</SUP>. Another main tool is a result of Zippin's type. We show that weakly Cauchy sequences in X=C(K) can be uniformly well approximated by weakly Cauchy sequences from a certain C[0,α], α is a countable ordinal, subspace of X<SUP>**</SUP>.

韓國人의 標準體重値와 正常適應體重値에 關한 硏究

尹太永,崔重明,朴淳永,金大棒 韓國保健敎育學會 1996 보건교육건강증진학회지 Vol.13 No.1

Using Random Sampling, the authors measured the body heights and weights of 31,151 persons- 17,102 in males and 14,049 in females from metropolitan, urban and rural areas between 6 to over 80 year old - for the purpose of investigating the type and the actual condition of the Korean's growth and development. At first, on the basis of the results, the authors measured the growth and development, various kinds of physiques, nutritional index of the 6 to 20s age group. Second, the authors presented the standard body weight of males and females by their body height, who were in the end of their growth (20-29 age group). Third, the authors calculated and presented the normal adapted body weight of the age group who were over 30 age after the growth had been completed. Forth, the author presented the obesity rate of the adults over 20 years old by body mass index. Finally, the authors compared chronological change of the Koreans' body heights and body weights with the results of other researchers. 1. Body Measurement Rapid growth, in terms of body height, which is described by a straight line on a growth curve has been observed among males in the ages 6-13 and among females 6-14. That growth curve turned out to be slower among the people of higher ages by both sexes. The cross-over occurred in both sexes at 11-14. The highest growth rate for a year is at 13-16 for males and 11-13 for females. This indicates that females enter a rapidly growing stage 2 years earlier than males. 2. Various Physiques and Nutritional Index Rapid growth, in terms of Relative Body Weight Index, which is described by a straight line, has been observed among males in the ages 6-16 and females in the ages 6-14. The cross-over occurred in both sexes 12.5-14.5 age in the adolescencent period. Whereupon females outgrow males. The Roher Index displayed more good value in case of females than male and in the adolescent period, the level of fullness is lower than after the completion of development. The Kaup Indices of both sexes increase with age. The index is less than 2.0 for males in 6-14 age group and for females in 6-13 age group and with this, it appeared that development of horizontal axis to long axis is poor. The index is more than 2.0 after 15 age group in males and 14 age group in females and developmental state4 age group and for females in 6-13 age group and with this, it appeared that development of horizontal axis to long axis is poor. The index is more than 2.0 after 15 age group in males and 14 age group in females and developmental state. Body Mass Index is less than 20 for males 6-14 age group and for females in 6-13 age group. In the case of the higher age group, that index maintains a normal state. 3. Average Body Height, Body Weight and Desirable Body Weight of Korean Youth (20-29 Age Group) The average body weight and body height of full-grown Korean youth was 172.5 ± 5.4㎝ and 66.3 = 9.5㎏ for male, 159.3 ±4.6 ㎝ and 53.5 ±6.9 ㎏ for females. In the case of calculating Desirable Body Weight of Korean youth, correlation coefficient of r = + 0.38(p < 0.001)between body height and body weight was found the male group and r = + 0.37(p < 0.001) in the female group, from which respective linear regression equation of body weight and height was established for male and female as follows; Male : Y(Body Weight, ㎏) = 0.66 x (Body Height, ㎝) - 48.93 Female :Y(Body Weight, ㎏) = 0.56 x (Body Height, ㎝) - 36.01 4. Formulae for calculating Normal Adapted Body Weight of Korean Adult. ⅰ)Average body height and body weight by age-groups 30-39 age-group Male : 170.4 ±4.9㎝ and 67.6 ±8.1㎏ Female : 158.5 ±3.9㎝ and 53.6 ±6.0㎏ 40-49 age-group Male : 169.1 ±4.9㎝ and 68.0 ±8.5㎏ Female : 157.3 ±4.7㎝ and 56.8 ±7.7㎏ 50-59 age-group Male : 168.1 ±6.8㎝ and 66.0 ±8.1㎏ Female : 157.2 ±4.7㎝ and 57.3 ±7.1㎏ 60-69 age-group Male : 168.0 ±5.3㎝ and 46.7 ±8.7㎏ Female : 155.2 ±5.0㎝ and 56.2 ±9.1㎏ Over 70 age-group Male : 166.1± 6.5㎝ and 62.8±1.2㎏ Female : 152.8 ±5.3㎝ and 52.8 ±8.5㎏ ⅱ) Correlation Coefficient and Linear Regression Equation by Age-groups 30-39 age-group Male : r=+0.44(p<0.001), Y=0.73X-57.94 Female : r=+0.45(p<0.001), Y=0.68X-55.52 40-39 age-group Male : r=+0.54(p<0.001), Y=0.93X-89.92 Female : r=+0.41(p<0.001), Y=0.67X-50.52 50-59 age-group Male : r=+0.32(p<0.001), Y=0.38X-1.22 Female : r=+0.37(p<0.001), Y=0.55X-29.76 60-69 age-group Male : r=+0.51(p<0.001), Y=0.83X-74.84 Female : r=+0.39(p<0.001), Y=0.70X-53.06 over 70 age-group Male : r=+0.63(p<0.001), Y=1.10X-119.96 Female : r=+0.40(p<0.001), Y=0.63X-44.64 Standard Body Weight and Normal Adapted Body Weight of Korean Adult by Age. Using respective regression equation, standard body weight<Table 10, 11>, normal adapted body weight <Table 12~21>, overweight and underweight of the Korean Adult was established for each age group. 6. Obesity Rate of Korean Adult Obesity rate of Korean adult was 9.4% (Male: 9.9%, Female : 8.4%). 7. The Chronological Change on Mean Values of Body Height and Body Weight in Korean Adult The Comparison with the mean values of body height and weight from 1910s to the present 1994 was been remarkably improved, and listed in <Table 23>.

돼지 교배조합별 등심의 품질특성 비교

정지택(J. T. Jeong),최영석(Y. S. Choi),이진규(J. K. Lee),최정석(J. S. Choi),정영철(Y. C. Jung),정종현(J. H. Jung),최양일(Y. I. Choi) 충북대학교 동물생명과학연구소 2016 동물생명과학연구 Vol.8 No.-

This study was conducted to compare the quality characteristics of pork loin from crossbred combination in pigs. The crossbred combination were Y×Y, YL×Y, YL×D and YL×L(L:Landrace, Y:Yorkshire, D:Duroc). In the proximate composition, the moisture content of YL×D was higher compared with the other crossbred combination. The fat content of YL×Y was significantly higher compared with the other crossbred combination(p<0.05). There ware no significantly difference in share force, WHC, dip loss and cooking loss. The lightness (L<SUP>*</SUP>) value of YL×Y was significantly higher compare with the other crossbred combination(p<0.05). The redness (a<SUP>*</SUP>) values of Y×Y was higher compared with the other crossbred combination. In sensory characteristics, the juiciness, tenderness, flavor and overall acceptability of YL×D were higher compared with the other crossbred combination. As results, it is considered that this information about crossbred combination pigs would be used as a basic data for improvement of pork quality.

Serum lactoferrin level as a serologic biomarker for allergic rhinitis

Choi, G. -S.,Shin, S. -Y.,Kim, J. -H.,Lee, H. -Y.,Palikhe, N. S.,Ye, Y. -M.,Kim, S. -H.,Park, H. -S. Blackwell Publishing Ltd 2010 Clinical and experimental allergy Vol.40 No.3

<P>Summary</P><P>Background</P><P>Allergic rhinitis (AR) is a very common disease and a risk factor for allergic asthma. The discovery of new biomarkers for the early detection of AR would improve the clinical outcomes and reduce socio-economic burden. We sought to identify a novel serologic marker for detection of AR using a proteomic approach.</P><P>Methods</P><P>To identify the proteins involved in AR, comparative proteomics was applied using nasal lavage fluids (NLFs) taken before and after a nasal provocation test (NPT) with <I>Dermatophagoides pteronyssinus</I> (<I>Dpt</I>) in a subject with AR sensitized to <I>Dpt</I>. The clinical relevance of the identified proteins was evaluated by ELISA using NLFs and sera from the three study groups: <I>Dpt</I>-sensitive AR; asymptomatic <I>Dpt</I>-sensitive controls; and non-atopic healthy controls. The sensitivities and specificities of the candidate proteins for predicting AR were determined using receiver operating characteristic (ROC) curves.</P><P>Results</P><P>In proteomic analysis, lactoferrin expression was up-regulated after NPT. The validation study using ELISA showed a significantly lower serum lactoferrin level in the AR group than those of the other two groups (<I>P</I><0.05, respectively). To discriminate between subjects with or without AR, the optimal serum cut-off level of lactoferrin was set at <307 ng/mL using the ROC curve. The sensitivity and specificity for predicting AR were 81.4% and 58%. When combined with serum <I>Dpt</I>-specific IgE level, the sensitivity and specificity for predicting AR were 76.7% and 79.2%.</P><P>Conclusion</P><P>These results suggest that the serum lactoferrin level is associated with the phenotype of <I>Dpt</I>-sensitive AR, and in combination with the serum <I>Dpt</I>-specific IgE level, may be a potential serologic marker for early detection of AR.</P><P><I>Cite this as</I>: G.-S. Choi, S.-Y. Shin, J.-H. Kim, H.-Y. Lee, N. S. Palikhe, Y.-M. Ye, S.-H. Kim and H.-S. Park, <I>Clinical & Experimental Allergy</I>, 2010 (40) 403–410.</P>

Enhanced magnetic coercivity and maximum energy product in double-perovskite Y₂CoMnO₆single crystals

Choi, H. Y.,Oh, S. H.,Moon, J. Y.,Kim, M. K.,Oh, D. G.,Lee, N.,Choi, Y. J. Wiley (John WileySons) 2015 Physica Status Solidi. Rapid Research Letters Vol.9 No.11

대학생의 인터넷중독 및 스마트폰 중독 정도와 미술 치료 인식에 대한 조사 연구

박혜원,송승윤,윤하영,이경현,이소영,이지원,진예은,최시온,허은서,황다빈,신주현,이인영 이화여자대학교 간호학회 2018 이화간호학회지 Vol.- No.52

Purpose: Investigate the level of Internet and smart phone addiction of college students and difference of their perception on the art therapy. Method: Data was collected using 4 categories of questionnaires. Participants of this study were 383 college students who are currently attending universities located in seoul, Kyung-Ki and Incheon. The Chi-square test, One-way Analysis of Variance, Scheffé test were performed using IBM SPSS Statistics 23.0 Result: First, the study has established that the status of attending universities, grade, people who living with, age affected the level of Internet addiction of college students. In terms of the level of smart phone addiction of college students, the status of attending universities, gender, age were the affective factors. Second, there was a significant difference on the perception of the advantages of the art therapy and the level of acknowledging it, depending on the level of Internet addiction. Finally, depending on the level of smartphone addiction, there was a significant difference in the level of perception of the art therapy, expectation toward the art therapy and the helpfulness of art therapy. The more the participants are close to the addicted level, the more they want to experience the art therapy. Conclusion: These results suggest. First, it is necessary to use bigger group of participants. Second, it is necessary to improve the research methods for college students. Third, nurse should offer holistic care toward the patients regarding their general characteristics by adapting this study. Finally, it is necessary to improve the art therapy programs for the college students who are addicted to the Internet and smartphone and to develop researches proving the effectiveness of these programs.

Amplification of Porcine SRY Gene for Sex Determination

Choi, S.G.,Bae, M.S.,Lee, E.S.,Kim, S.O.,Kim, B.K.,Yang, J.H.,Jeon, C.E.,Kim, H.H.,Hwang, Y.J.,Lee, E.S.,Kim, D.Y. Asian Australasian Association of Animal Productio 2009 Animal Bioscience Vol.22 No.8

The separation of X and Y chromosome-bearing sperm is of use in many aspects of livestock maintenance. In this study, we sought to determine the difference in DNA content between X- and Y-bearing sperm, separate sperm into X- and Y-enriched pools, and assess the efficacy of sorting. Sperm collected from Duroc and miniature pigs were stained with 20.8 $\mu{M}$ Hoechst 33342 and analyzed using a high-speed cell sorter. Measurement of the fluorescence intensity of stained sperm nuclei revealed that the X-bearing sperm of Duroc and miniature pigs respectively contain 2.75% and 2.88% more DNA than Y-bearing sperm. In total, 50.18% of the sperm were assigned to the X-sorted sample and 49.82% was assigned to the Y-sorted sample for Duroc pigs. For miniature pigs, the Xsorted sample represented 50.19% of the population and the Y-sorted represented 49.81% of the population. Duplex PCR was used to evaluate accuracy of sorting. A fast and reliable method for porcine sexing was developed through amplification of the sex-determining region of the Y chromosome gene (SRY). Oligonucleotide primers were designed to amplify the conserved porcine SRY high motility group (HMG) box sequence motif. We found that the primer pair designed in this study was 1.46 times more specific than previously reported primers. Thus, this study shows that the present method can be applied in porcine breeding programs to facilitate manipulation of the sex ratio of offspring and to achieve precise sexing of porcine offspring by amplification of the HMG box of the SRY gene.

Bi_2Sr_2Ca_1-xNa_xCu_2O_8+y 산화물 고온초전도체의 Ca 위치에 Na치환 효과

이민수,송승용,이종용,송기영,최봉수 대전산업대학교 반도체기술연구소 1999 半導體技術硏究所報 Vol.1 No.-

산화물 고온초전도체의 초전도성은 Cu-O면의 hole 농도와 밀접한 상호관계를 갖고 있음이 잘 알려져있다. 그러므로 본 연구에서는 Cu-O면의 hole 농도를 변화시키기 위해, Bi계 2212상(80K 상)의 구조안에 있는 +2가인 Ca 위치에 +1가의 알카리 원소를 치환하였다. 즉, Cu-O면의 hole 농도를 변화시킴에 따른 초전도성의 변화 및 초전도체의 결정구조 변화를 조사하였다. 그 결과 Ca 위치에 Na를 치환한 고용한계는 x<0.3이었다. 시료 안의 Na 치환량을 증가시킴에 따라 임계온도 T_c 와 hole 농도는 점차 증가하여 최대값을 갖은 후 서서히 감소 되었고, Na 치환량 x>-0.7 이상에서는 금속 - 반도체 전이현상이 관찰되었다. 또한 Na 치환의 고용한계내에서 결정상수 c^-축은 점차 감소하였고, a,b- 축은 점차 증가되는 경향을 보였다. The samples of Bi_2Sr_2Ca_1-xNa_xCu_2O_8+y with various carrier concentration were synthesized by substituting Na for Ca ion. The superconducting properties, hall coefficients and X-ray powder diffraction were measured the samples. Single phase samples were obtained for 0<-x0.3 of Bi_2Sr_2Ca_1-xNa_xCu_2O_8+y. In the single phase, the critical temperature T_c and carrier concentration increase with the increase of Na concentration pass through a maximum and then decreases. In the range of x>-0.7 to the Na doped samples, howerever, we observed the metal-semiconductor transition. The c-axis seemed to decrease and a, and b-axes increase with increasing Na concentration in the single phase. Decreasing of c-axis while increasing x is due to the smaller size of Na^-1 ions to the Ca+2 ions. In the range of x>0.3 however, the trend becomes ambiguous due to the inclusion of the 10 K phase and impurity phase.