• Child Health Nursing Research
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• 제24권1호
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• pp.37-47
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• 2018

Purpose: The purpose of this study was to construct a model to explain the parenting satisfaction associated with the role transition of older mothers with preschool children. Methods: The participants of this study were mothers of 3- to 6-year-old children who gave birth after 35 years of age, and were drawn from 16 child care centers and 8 kindergartens in 4 administrative districts of B city. Data were analyzed using SPSS for Windows version 22.0 and AMOS for Windows version 22.0. Results: Parental stress, mother-child interactions, parental beliefs regarding personality, and socioeconomic status (income, education, and occupation) had direct effects on parenting satisfaction. Social support also showed direct and indirect effects. Among the sub factors of child temperament, sociability had a significant effect. These variables explained 57.4% of the variation in parenting satisfaction. Conclusion: The results of this study will contribute to the development of effective programs to enhance the parenting satisfaction of older mothers, and will help older mothers through the role transition necessary for the growth of their children.

• Human Ecology Research
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• 제59권1호
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• pp.113-125
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• 2021

Previous research on the association between marriage and life satisfaction is limited due to the lack of attempts to investigate the time profiles of life satisfaction around marriage. This study addresses unresolved questions about the positive association between marriage and life satisfaction as well as tests if it is moderated by childhood parental divorce. Using 14 waves of the Korean Welfare Panel Study(N=3,890 individuals or 25,338 person-year observations), the author first used an ordinary least squares model with clustered standard errors and found that married people reported higher life satisfaction before marriage, compared to people who remained single during the survey. This result supports a social selection perspective. Next, the author used a fixed effects regression model and found that the transition into marriage was associated with an initial rise and subsequent decline in life satisfaction. Life satisfaction increased after reaching its lowest level in the third year of marriage. Life satisfaction after the transition into marriage was significantly higher than that observed three or more years prior to marriage. The result supports a social causation perspective. Such changing patterns were not moderated by parental divorce during childhood. This study advances the current literature on marriage and life satisfaction by using a nationally representative longitudinal data set as well as by testing social selection and causation perspectives.

• 한국초전도ㆍ저온공학회논문지
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• 제24권2호
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• pp.19-22
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• 2022

We studied the effect of substrate-induced strain state on the superconducting transition in GdBa₂Cu₃O_7-x(GdBCO)/La_0.7Sr_0.3MnO₃ (LSMO) bilayers deposited on a LaAlO₃ (LAO) substrate. The stain state of LSMO is controlled by increasing the thickness from 20 nm to 80 nm. Analyses on the extended X-ray absorption fine structure (EXAFS) measurements reveal difference in the direction of MnO₆ octahedral distortion depending on the LSMO thickness, which leads to a difference in anisotropy of magnetization of LSMO layer. The superconducting transitions of our system are strongly correlated with the magnetic anisotropy accompanied by the MnO₆ octahedron distortion in a specific direction. This result suggests the possibility of improving the superconducting transition in the GdBCO/LSMO bilayer system by controlling the degree of competition between superconductivity and ferromagnetism via adjusting strain state in the LSMO layer.

• 한국경제지리학회지
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• 제24권4호
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• pp.386-399
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• 2021

본 연구는 폭발적으로 성장하고 있는 전기차 산업을 대상으로 한다. 현재 중국은 세계 최대의 전기차 생산량을 기록하고 있으며, 다수의 글로벌 기업 및 로컬 기업들이 전기차 산업 전환환경에 조응하여 다양한 활동을 전개하고 있다. 이러한 전환의 원인과 환경적 특성을 분석하기 위해 생산 네트워크의 주요 행위자인 중국정부와 완성차기업, 전후방 연계산업상의 기업들의 활동을 분석했다. 그 결과 중국정부의 전폭적인 지원으로 기존 행위자들의 기능적 변화, 신규 행위자들의 진입 증가 등을 통해 새로운 가치가 동반되는 전기차 산업공간으로의 전환이 나타났다.

• 가정과삶의질연구
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• 제19권3호
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• pp.135-155
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• 2001

The purpose of this study was to investigate the general tendency of family/kin ritual transition and to find out related variables. For this purpose, 593 subjects of rural family were interviewed with questionnaires. The major results of the study were summarized as follows: 1. It was discovered that the characteristics of the ritual transition among the rural families is same as the urban families, i.e. westernization, commercialization, and socialization. But the speed of rural area was relatively slow. 2. In contemporary family/kin rites, traditional structure coexisted with external westernized aspects by the group who were elderly, lowly educated, lowly earned and Buddhist. 3. The family/kin rites were more significantly different depending on the age than gender, and the religion was the significant variable to the family/kin rites. So the family/kin ritual management education programs were needed.

• 대한가정학회지
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• 제37권7호
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• pp.1-16
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• 1999

Information technology and globalization are two main forces that will bring in a social transition in the new millenium. Human Ecology, as a discipline to study the interaction between individuals and families and their environment, needs to define a new mission in changing social environments. This paper analyzes the forces behind this social transition and their influences to the lifestyle of individuals and families. It also defines new missions of Human Ecology in terms of education, subjects and methods of research, and public responsibilities. As the society changes, the paradigm of Human Ecology should be expanded to cover newly appearing environmental factors. It should be emphasized that these expanded areas should be under the unified field of Human Ecology to offer the integrated approaches that other specialized field may not offer.

• Journal of Magnetics
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• 제17권1호
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• pp.13-18
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• 2012

Starting with Kubo's formula and using the projection operator technique introduced by Kawabata, EPR lineprofile function for a $Mn^{2+}$-doped wurtzite structure GaN semiconductor was derived as a function of temperature at a frequency of 9.49 GHz (X-band) in the presence of external electromagnetic field. The line-width is barely affected in the low-temperature region because there is no correlation between the resonance fields and the distribution function. At higher temperature the line-width increases with increasing temperature due to the interaction of electrons with acoustic phonons. Thus, the present technique is considered to be more convenient to explain the resonant system as in the case of other optical transition systems.

• 대한화학회지
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• 제22권3호
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• pp.111-116
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• 1978

메탄올-물, 에탄올-물, 아세톤-물 및 아세토니트릴-물의 二成分 混合溶媒에서 鹽化페닐메탄술포닐의 加溶媒分解反應을 速度論的으로硏究하였다. 反應速度는 反陽性子溶媒에서 보다 陽性子溶媒에서 더 빨랐으며, 이온化能力에 對한 反應速度의 感度 즉 Winstein 圖示의 m와 轉移狀態의 溶媒和數는 陽性子溶媒에서 훨씬 작았다. 이것은 陽性子溶媒의 水素結合溶媒和에 依한 初期狀態의 安定化로서 생각할 수 있다. 反應은 모든 溶媒系에 있어서 轉移狀態의 結合形成이 結合破壤을 앞지르는$S_N2$ 메카니즘으로 일어난다 할 수 있다.

• Journal of Magnetics
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• 제10권2호
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• pp.71-75
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• 2005

An effective method, i.e., the solid atom method, is suggested to obtain the Coulomb interaction parameter, U, and the Hund exchange coupling constant, J, for use in the LDA+U calculation. The par~meters are obtained self-consistently during the LDA+U calculation. The method is applied to typical transition metal oxides and $MnB^{VI}(B^{VI}=S,Se,Te)$. The U values for the transition metal oxides have similar magnitude to previous calculations although they are obtained by a much simpler method. $MnB^{VI}s$ have been characterized as crossroads materials between charge transfer and band insulators by the LDA+U calculation.

• 반도체디스플레이기술학회지
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• 제11권1호
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• pp.35-39
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• 2012

$YAlO_3:Tb{_x}^{3+}$ has been synthesized by a combustion process and the concentration x of Tb was varied from 0.001 and 0.05 mol% per mole of $YAlO_3$. The emission optical properties on the $YAlO_3:Tb{_x}^{3+}$ have been investigated by time-resolved photoluminescence spectra and decay curves of center wavelength. The emission color changes from blue to green with increasing the $Tb^{3+}$ concentration from x= 0.001 to 0.05 mole fraction in $YAlO_3$ host. This emission color change can be explained in terms of cross-relaxation processes. Decay curves of emission intensity indicate that the type of energy transfer is donor-acceptor transition.