• Korean Journal of Health Education and Promotion
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• v.27 no.1
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• pp.9-19
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• 2010

Objectives: This study is to identify the factors which affect children's preventive behavior for novel influenza A(H1N1) and to provide basic data to health education for children. Methods: The subject of this study were 551 children who were attending on the 4~6th grade in elementary school in Seoul. The data were collected using a self-reporting questionnaire for 5 days from October 12 through 16, 2009. Data were all digitized and analyzed using SPSS 17.0K. Results: As for relationship between preventive behavior and the other variables, correlations were observed with sensibility, self efficacy, respond efficacy and behavior intention, and it was statistically significant(p<.001). According to the result of analyzing factors affecting preventive behavior for Novel Influenza A(H1N1), it was affected by variables such as perceived threat, perceived efficacy, behavior intention. Behavior intention was the most influencing variable and has shown influence in order of self efficacy, sensibility, severity and respond efficacy as follows. Conclusion: The results showed effects on preventive behavior of perceived threat, perceived efficacy and behavior intention. It may be beneficial to improve empowerment for students to prevent influenza A(H1N1) by focusing on perceived threat, perceived efficacy, behavior intention.

• Bulletin of the Korean Mathematical Society
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• v.44 no.1
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• pp.177-184
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• 2007

We study the asymptotic behavior of nonlinear Volterra difference system $$x(n+1)=f(n,x(n))+{\sum\limits^{n}_{s=n_{o}}\;g(n,s,x(s)),\;x(n_{o})=xo$$ by using the resolvent matrix R(n, m) of the corresponding linear Volterra system and the comparison principle.

• Korean Journal of Child Studies
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• v.36 no.5
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• pp.173-188
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• 2015

The main purpose of this study was to investigate the effects of a mother's big five personality factors and playfulness on maternal parenting behavior. The participants consisted of 270 mothers with young children, aged 3-6 years old. The subjects completed questionnaires on IPIP(International Personality Item Pool), PAS(Playfulness Scale for Adults) and Parenting Behavior. The results were as follows. First, regarding the relationships of the mother'personality and parenting behavior, higher levels of neuroticism(N) in the mothers resulted in lower levels of warmth acceptance(W A) in parenting behavior. Higher levels of extroversion(E), openness(O), agreeableness(A), and conscientiousness(C) resulted in higher levels of W A. In terms of the relationships of the mother's playfulness and parenting behavior, higher levels of playfulness resulted in higher levels of W A. and lower levels of permissiveness nonintervention(P N) and rejection restriction(R R). Second, N, E, C, and a maternal sense of humor had an effect in W A. C was found to have an effect in P N and N was observed to have an effect in R R.

• Journal of Family Relations
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• v.23 no.2
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• pp.3-28
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• 2018

Objectives: The study examined the mediated role of family functioning in the relation between fathers' and mothers' depression and drinking behaviors, and children's internalizing/externalizing problems and peer-play behavior. Methods: The study utilized data from the Panel Study on Korean Children(PSKC), namely Wave 5 data(N=1,703) for parental depression and drinking behavior, Wave 6 data(N=1,662) for family functioning, and Wave 7 data(N=1,620) for children's internalizing/externalizing problems and peer-play behavior. Results: Mothers' perceived family functioning mediated the relation between parental depression and boys' internalizing/externalizing problems. Second, fathers' perceived family functioning mediated the relation between parental depression and children's peer-play behavior. Third, only when both parents engaged in an above-average level of drinking behavior, did father perceive that their family functioning was low. Conclusions: This study showed the mediated effect of family functioning in the influence of parental depression and drinking behavior on children's developmental outcomes. The study ditermined that fathers and mothers played different roles in children's development, and found different mechanisms related to parental depression and their drinking behavior.

• Korean Journal of Metals and Materials
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• v.49 no.10
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• pp.774-779
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• 2011

S-N fatigue behavior of cast 304 stainless steel was studied at 25, -50 and $-196^{\circ}C$ and at a stress ratio of -1 in uniaxial and bending loading condition. It was found that the resistance to S-N fatigue was greatly improved with decreasing testing temperature. The normalized S-N fatigue curves by tensile strength at three different testing temperatures matched each other, suggesting that tensile strength determines the S-N fatigue resistance of cast 304 stainless steel at low temperatures. The effects of different loading on the resistance to S-N fatigue of cast 304 stainless steel were quantified. The S-N fatigue curves at 25, -50 and $-196^{\circ}C$ were described by using Basquin's law the relationship between the S-N fatigue curve and the testing temperature was obtained by using a simple regression method.

• The Journal of the Korea Contents Association
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• v.6 no.4
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• pp.63-68
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• 2006

For the almost co티am convergent series $S_n$ of independent random variables, by investigating the limiting behavior of the tail series, $T_n=S-S_{n-1}=\sum_{i=n}^{\infty}X_i$, the rate of convergence of the series $S_n$ to a random variable S is studied in this paper. More specifically, the equivalence between the tail series weak law of large numbers and a limit law is established for a quasi-monotone decreasing sequence, thereby extending a result of Previous work to the wider class of the norming constants.

• Communications of the Korean Mathematical Society
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• v.9 no.4
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• pp.767-772
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• 1994

For an $n \times n$ complex matrix $A = [A_{ij}]$, the permanent of A, per A, is defined by $$ per A = \sub_{\sigma \in S_n}{a_{1 \sigma(1)} a_{2 \sigma(2)} \cdots a_{n \sigma(n)} $$ where $S_n$ stands for the symmetric group on the set {1, 2, ..., n}.

• The Bulletin of The Korean Astronomical Society
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• v.42 no.2
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• pp.55.5-56
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• 2017

Galaxy dynamics probes weak gravity at accelerations below the de Sitter scale of acceleration adS = cH, where c is the velocity of light and H is the Hubble parameter. Low and high redshift galaxies hereby offer a novel probe of weak gravity in an evolving cosmology, satisfying H(z) = H0(1 + A(6z + 12z^2 +12z^3+ 6z^4+ (6/5)z^5)/(1 + z) with baryonic matter content A sans tension to H0 in surveys of the Local Universe. Galaxy rotation curves show anomalous galaxy dynamics in weak gravity aN < adS across a transition radius r beyond about 5 kpc for galaxy mass of 1e11 solar mass. where aN is the Newtonian acceleration based on baryonic matter content. We identify this behavior with a holographic origin of inertia from entanglement entropy, that introduces a C0 onset across aN=adS with asymptotic behavior described by a Milgrom parameter satisfying a0=omega/(2pi), where omega=sqrt(1-q)H is a fundamental eigenfrequency of the cosmological horizon. Extending an earlier confrontation with data covering 0.003 < aN/adS < 1 at redshift z about zero in Lellie et al. (2016), the modest anomalous behavior in the Genzel et al. sample at redshifts 0.854 < z <2.282 is found to be mostly due to clustering 0.36 < aN/adS < 1 close to the C0 onset to weak gravity and an increase of up to 65% in a0.

• Mass Spectrometry Letters
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• v.6 no.3
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• pp.65-70
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• 2015

N-Alkyl/benzyl substituted isatin derivatives are intermediates and synthetic precursors for the preparation of biological active heterocycles. N-alkyl/benzyl isatins have showed various biological activities, such as cytotoxicity, antiviral, caspase inhibition, cannabinoid receptor 2 agonists for the treatment of neuropathic pain, etc. In this study, N-alkyl/benzyl isatin derivatives were synthesized from isatin and alkyl/benzyl halides in presence of K₂CO₃ in DMF and excellent to quantitative yields (~95%) were obtained. Isatins and benzyl-isatins were condensed with fluorescein hydrazide to form fluorescein hydrazone. All the compounds were subjected to their fragmentation behavior study using LC/MSⁿ. N-Alkyl substituted isatin derivatives fragmented at nitrogen-carbon (N-C) bond, hence gave daughter ion as [RN+H]⁺. Whereas, N-benzyl substituted isatin derivatives fragmented at carbon-carbon (C-C) bond of alkyl chain which linked with nitrogen molecules, therefore gave N-methyl fragments [RNCH₂]⁺. This study demonstrated that, isatin moiety present in a small/large molecule or in a matrix of reaction mixture with/without N-alkyl/benzyl substituents can be identified by mass spectroscopic fragmentation behavior study.

• Korean Journal of Child Studies
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• v.26 no.6
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• pp.17-28
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• 2005

To understand further the differences in the distribution of attachment classifications assigned to 12-15 month old infant raised in Korea(N=85) and the U.S.(N=104), detailed analyses of maternal and infant behavior during the Strange Situation was undertaken. Indices of infants' attachment behavior with their mothers and distress during separations were rated. The percentage of Korean infants classified as secure versus insecure mirrored the global distribution, however, fewer Korean babies were classified as avoidant, As predicted, secure Korean babies were less likely than secure U.S. babies to approach their mothers, maintain contact or show resistant behavior and more often displayed distress during the second separation from their mother. Resistant Korean babies, however, did not significantly differ from resistant U.S. babies with respect to their attachment behavior but more often displayed distress when left with a stranger. These findings are discussed with respect to cultural differences in caregiving.