• Journal of the Korean Magnetics Society
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• v.25 no.6
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• pp.175-179
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• 2015

The half-metallicity and magnetism of the (001) surfaces of $(AlP)_1/(CrP)_1$ superlattice were investigated by means of FLAPW (Full-potential Liniarized Augmented Plane Wave) method. We considered four types of (001) surface termination, i.e., Al(S)-, Cr(S)-, P(S)Al(S-1)- and P(S)Cr(S-1)-term systems. We found that only Cr(S)-term system maintains the half-metallicity at the surface as only this system has the calculated magnetic moment of integer number of bohr magnetons. The magnetic moment of Cr(S) atom in the system was $3.02{\mu}_B$ which was increased from the bulk value by the effects of band narrowing and increased spin-splitting at the surface. The electronic density of states of the P(S) atom in the P(S)Al(S-1)-term showed very sharp surface states due to the broken $p_z$ bonds at the surface. We found there is still a strong p-d hybridization between the P(S) and Cr(S-1) layers in the P(S)Cr(S-1)-term which causes a considerable increase of magnetic moment of P(S) atom.

• Journal of the Korean Chemical Society
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• v.36 no.2
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• pp.318-323
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• 1992

Following seven new nucleophilic adducts of sulfilimine compounds were prepared by the addition of 1-methyl-5-mercapto-1,2,3,4-tetrazole to vinylsulfilimine derivatives; S-Phenyl-S-2-(1-methyl-1,2,3,4-tetrazole-5-thio)-ethyl-N-p-tosylsulfilimine, S-p-tolyl-S-2-(1-methyl-1,2,3,4-tetrazole-5-thio)-ethyl-N-p-tosylsulfilimine, S-m-tolyl-S-2-(1-methyl-1,2,3,4-tetrazole-5-thio)-ethyl-N-p-tosylsulfilimine, S-p-chlorophenyl-S-2-(1-methyl-1,2,3,4-tetrazole-5-thio)-ethyl-N-p-tosylsulfilimine, S-p-bromophenyl-S-2-(1-methyl-1,2,3,4-tetrazole-5-thio)-ethyl-N-p-tosylsulfilimine, S-p-methoxyphenyl-S-2-(1-methyl-1,2,3,4-tetrazole-5-thio)-ethyl-N-p-tosylsulfilimine and S-p-nitrophenyl-S-2-(1-methyl-1,2,3,4-tetrazole-5-thio)-ethyl-N-p-tosylsulfilimine. The structures of these adducts were confirmed by elemental analyses, MP, UV, IR-and NMR-Spectra.

• The Korean Journal of Physiology and Pharmacology
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• v.6 no.3
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• pp.139-142
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• 2002

To examine intracellular signaling of human $S1P_3\;(hS1P_3),$ a sphingosine 1-phosphate (S1P) receptor in plasma membrane, $hS1P_3$ DNA was transfected into RH7777 rat hepatoma cell line, and the inhibition of forskolin-induced cAMP accumulation and activation of MAP kinases by S1P were tested. In $hS1P_3$ transformants, S1P inhibited forskolin-induced activation of adenylyl cyclase activity by about 80% and activated MAP kinases in dose-dependent and pertussis-toxin (PTX) sensitive manners. In oocytes expressing $hS1P_3$ receptor, S1P evoked $Cl^-$ conductance. These data suggested that PTX-sensitive G proteins are involved in $hS1P_3-mediated$ signaling, especially the positive action of S1P in cell proliferation. The potential advantages of rat hepatoma cells for the research of sphingosine 1-phosphate receptor are discussed.

• Korean Journal of Human Ecology
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• v.12 no.4
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• pp.417-432
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• 2003

The purpose of this study was to investigate the relationships between mother's beliefs on child rearing and children's self-perceptions. The subject of this study were comprised of 167 children aged 8-10 in Iksan & Kunsan city from Dec. 2 to Dec. 8, 2000. The children's self-perceptions were assessed by the self perceptions profile for children. Mother's beliefs questionnaire, developed by Okagaki and Sternberg, was used to obtain the data on mother's beliefs of parenting. The methods of analyses included basic descriptive categorical analysis as well as t-test, one way ANOVA-test, and multiple regression analyses. The major findings from the analyses are as follows: First, a significant difference was found in the degree of mother's beliefs about child rearing by mother's religion(p<.01), mother's education(p<.05), income(p<.001), level of life (p<.0l), mother's job, mother and fathers' agreement of child rearing(p<.05), relationship between mother and child(p<.05) in independence but a significant difference was not found in the degree of mother's beliefs about child rearing in accommodation. Second, the levels of children's scholastic performance were related to higher levels of mother's education(p<.001), mother's income(p<.001), mother and fathers' agreement of child rearing(p<.01). The levels of children's social competence was related to higher, child's gender (p<.01); girls were higher than boys. The levels of children's athletic abilities were not significant. The levels of children's physical appearance was related to higher levels of mother's education(p<.01), mother's income(p<.01), level of life(p<.05), mother's marriage(not divorce)(p<.01). The levels of children's behavioral conduct were related to higher levels of child's gender (p<.05), mother's education(p<.01), mother's income (p<.01), relationship between father and child(p<.0l). The levels of children's global self worth were related to higher levels of mother's age(p<.05), mother's education(p<.001), level of life(p<.05). Third according to the multiple regression analyses for the relationships between mother's beliefs about child rearing and children's self perceptions, mother's beliefs on the creativity were related to higher levels of children's scholastic performance, social competence, and mother's beliefs on the problem solving skills to higher levels of children's behavioral conduct and mother's beliefs on the accommodation to lower levels of children's scholastic performance, social conduct.

• Journal of Life Science
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• v.21 no.2
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• pp.183-193
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• 2011

Migration and differentiation of mesenchymal stem cells are crucial for tissue regeneration in response to injury. Sphingosine-1-phosphate (S1P) is a bioactive lipid that regulates a variety of biological processes, including proliferation, survival, differentiation and motility. In the present study, we determined the role of S1P in migration and differentiation of human bone marrow-derived mesenchymal stem cells (BMSCs). S1P stimulated migration of BMSCs in a dose- and time-dependent manner, and pre-incubation of the cells with pertussis toxin completely abrogated S1P-induced migration, suggesting involvement of Gi-coupled receptors in S1P-induced cell migration. S1P elicited elevation of intracellular concentration of $Ca^{2+}$ ($[Ca^{2+}]_i$) and pretreatment with VPC23019, an antagonist of $S1P_1/S1P_3$, blocked S1P-induced migration and increase of $[Ca^{2+}]_i$. Small interfering RNA-mediated knockdown of endogenous $S1P_1$ attenuated S1P-induced migration of BMSCs. Furthermore, S1P treatment induced expression of $\alpha$-smooth muscle actin ($\alpha$-SMA), a smooth muscle marker, and pretreatment with VPC23019 abrogated S1P-induced $\alpha$-SMA expression. S1P induced phosphorylation of p38 mitogen-activated protein kinase (MAPK), and pretreatment of cells with SB202190, an inhibitor of p38 MAPK, or adenoviral overexpression of a dominant-negative mutant of the p38 MAPK blocked S1P-induced cell migration and $\alpha$-SMA expression. Taken together, these results suggest that S1P stimulates migration and smooth muscle differentiation of BMSCs through an $S1P_1$-p38 MAPK-dependent mechanism.

• Journal of applied mathematics & informatics
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• v.31 no.5_6
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• pp.651-659
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• 2013

A graph is $s$-regular if its automorphism group acts regularly on the set of its $s$-arcs. In this paper, the cubic $s$-regular graphs of order 12p, 36p, 44p, 52p, 66p, 68p and 76p are classified for each $s{\geq}1$ and each prime $p$. The number of cubic $s$-regular graphs of order 12p, 36p, 44p, 52p, 66p, 68p and 76p is 4, 3, 7, 8, 1, 4 and 1, respectively. As a partial result, we determine all cubic $s$-regular graphs of order 70p except for $p$ = 31, 41.

• Bulletin of the Korean Mathematical Society
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• v.57 no.2
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• pp.429-441
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• 2020

Let M(X, Y) denote the space of multipliers from X to Y, where X and Y are analytic function spaces. As we known, for Dirichlet-type spaces 𝓓_α^p, M(𝓓_p-1^p, 𝓓_q-1^q) = {0}, if p ≠ q, 0 < p, q < ∞. If 0 < p, q < ∞, p ≠ q, 0 < s < 1 such that p + s, q + s > 1, then M(𝓓_p-2+s^p, 𝓓_q-2+s^q) = {0}. However, X ∩ 𝓓_p-1^p ⊆ X ∩ 𝓓_q-1^q and X ∩ 𝓓_p-2+s^p ⊆ X ∩ 𝓓_q-2+s^p whenever X is a subspace of the Bloch space 𝓑 and 0 < p ≤ q < ∞. This says that the set of multipliers M(X ∩ 𝓓 _p-2+s^p, X∩𝓓_q-2+s^q) is nontrivial. In this paper, we study the multipliers M(X ∩ 𝓓_p-2+s^p, X ∩ 𝓓_q-2+s^q) for distinct classical subspaces X of the Bloch space 𝓑, where X = 𝓑, BMOA or 𝓗^∞.

• Journal of the korean academy of Pediatric Dentistry
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• v.30 no.1
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• pp.80-91
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• 2003

Mutans streptococci, especially S. mutans and S. sobrinus strongly implicated in pathogenesis of dental caries, the major cause of tooth loss in children. Use of an antibacterial agent controlling dental caries has been rationalized. The present study was performed to observe the antibacterial effect of inorganic polyphosphates (polyP) on S. mutans and S. sobrinus. S. mutans GS5 and S. sobrinus 6715 were grown in brain-heart infusion broth with or without polyP. Minimal inhibitory concentration (MIC) of polyP for S. mutans GS5 was determined to be 0.08% and that for S. sobrius 6715 was 0.17%. PolyP 15 added to the growing culture of S. mutans GS5 and S. sobrinus 6715 at their exponential phase was as effective in inhibiting the growth of S. mutans GS5 and S. sobrinus 6715 as polyP added at the very beginning of the culture. More than 85% of the cells lost their viability determined by viable cell count when polyP 15 was added to the culture of growing S. mutans GS5 at MIC, suggesting that polyP 15 has bacterial effect on the bacterium. And more than 99.9% of the cells lost their viability determined by viable cell count when polyP 15 was added to the culture of growing S. sobrinus 6715 at MIC, suggesting that polyP 15 has bacterial effect on the bacterium. Intracellular nucleotide release from S. mutans CS5 and S. sobrinus 6715 was increased in the presence of polyP 15 for 5h but was not really reversed by the addition of divalent cations like $Ca^{++}\;and\;Mg^{++}$. The majority of the cells appeared to be atypical in their shape, demonstrating accumulation of highly electron-dense granules and ghost cells. The overall results suggest that polyP have a strong bactericidal activity against S. mutans and S. sobrinus in which lysis in relation to chelation may not play the major role but unknown mechanism that possibly affects the viability of the bacterium may be involved. PolyP may be used as an agent for prevention of dental caries.

• Proceedings of the Korea Concrete Institute Conference
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• 2009.05a
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• pp.525-526
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• 2009

On this paper we induce calcite($CaCO_3$) precipitation using microbial biomineralization of the Sporosarcina pasteurii and evaluate required performance evaluation by adjusting it to mortar. As a result carbonation normal mortar test piece(C3S-W) and mortar test piece(C3S-S.p) mixed with Sporosarcina pasteurii, reaction of C3S-S.p was late than C3S-W. Also, in the case of carbonation experiment of C3S-S.p curing in the Urea-CaCl2 aqueous solution(Medium) during 28days and durability of the C3S-W, durability of the mortar test piece(C3S-S.p) mixed with Sporosarcina pasteurii become higher than normal mortar test piece(C3S-W).

• Korean Security Journal
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• no.33
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• pp.229-260
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• 2012

The purpose of this study is to categorize the past Chiefs of Presidenteal Security Service so far based on their level of expertise and authority so that we can identify some specific reasons as to why some of them are recognized as successful while others are not, and that the categorization will be a guideline to future successful administration. In order to do so, a quantitative research has been implemented through meetings of a group security science expert who has been in security business for substantial amount of time. The result is as following: Authoritative/professional: 2nd Chief of P.S.S. Park, Jong-Gyu, 5th Chief of P.S.S. Jang, Se-Dong, 7th Chief of P.S.S. Lee, Hyeon-Wu, 8th Chief of P.S.S. Choi, Seok-Rip. Authoritative/Non-professional: 1st Chief of P.S.S. Hong, Jong-cheol, 3rd Chief of P.S.S. Cha, Ji-cheol, 6th Chief of P.S.S. Ahn, Hyeon-Tae, 14th Chief of P.S.S. Kim, In-Jong. Non-authoritative/professional: 4th Chief of P.S.S. Jeong, Dong-Ho, 9th Chief of P.S.S. Park, Sang-Beom, 13th Chief of P.S.S. Yom. Sang-Guk. Non-authoritative/Non-professional: 10th Chief of P.S.S. Kim, Gwang-Seok, 11th Chief of P.S.S. Ahn, Ju-Seop, 12th Chief of P.S.S. Kim, Se-Ok. This categorization research on the Chief of P.S.S. suggests that any president, to be a successful one, must choose the Chief of P.S.S. based on his/her expertise in order to secure national security.