• Korea Trade Review
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• v.44 no.5
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• pp.143-159
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• 2019

This study explores the relationship between outward foreign direct investment (FDI) and innovation in 61 industries of Korea between 1999 and 2016. In order to mitigate the endogeneity problem due to potential reverse causality between FDI and innovation, we use the GMM (generalized method of moments). Our results are as follows. First, FDI has a positive effect on innovation. A possible explanation is that through FDI, multinational companies may assimilate host countries' technologies and knowledge by learning, and then recreating new technologies. Furthermore, this positive effect appears greater, as industrial competition becomes fiercer. This result provides empirical evidence that by recreating technology and knowledge learned through FDI with their own intangible assets, such as patents, they may gain a competitive edge over competitors. Second, this study confirms the greater positive effects of FDI in developed countries, as well as countries with higher technology levels. Finally, strategic asset seeking FDI has the greatest positive impact on innovation in Korean industries. In summary, our findings provide empirical evidence that Korean multinationals can learn technology and knowledge of host countries through FDI to secure a competitive edge in the Korean market.

• Korea Trade Review
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• v.44 no.2
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• pp.269-282
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• 2019

This study analyzes the effects of participation in the global production network on the income inequality using panel data from 2005 to 2016 for 63 countries. In this study were used fixed effects model with autocorrelation, random effect model with autocorrelation and the GLS method. Results are as follows: First, the economic development level supports the Kuznets hypothesis. And then, the forward participation in global value chains increased income inequality, and the backward participation decreased income inequality. In order to derive more detailed estimation results, we analyzed OECD countries and non-OECD countries. First, OECD countries featured decreased, but increased beyond a certain level as a U-shaped curve, that did not support the Kuznets hypothesis. In contrast, non-OECD countries followed the Kuznets U-curve. Second, participation in the global production network showed that both OECD and non-OECD countries featured increased income inequality. In contrast, backward participation appears to mitigate income inequality both in OECD and non-OECD countries. Finally, the ratio of labor and capital is significant in mitigating income inequality in non-OECD countries in which they feature backward participation in production networks. This can be interpreted as developing economies participate in the global production network due to increased capital accumulation and increased the labor productivity.

• Journal of Family Relations
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• v.22 no.3
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• pp.3-27
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• 2017

Objectives: This study examined the effects of married couple's sexual satisfaction on perceived family strengths based on family systems theory that the changes of family subsystem could extend itself to involve the entire family system. Methods: For this purpose, the structured survey was conducted by 151 married couples living in Jeollanam-do and Gwangju. The data was analysed by SPSS 21.0 program. Results: First, the average scores of family strengths and sexual satisfaction were a little higher than the middle. There were no differences between husbands and wives. Second, family strengths perceived by husbands were significantly affected by income satisfaction, conflicts and sexual satisfaction. In wives, education level, satisfaction with communication times, conflicts and sexual satisfaction were influential factors. Conclusion: It is necessary to pay the most attention to sexual satisfaction of couples in order to improve family strengths. In addition, it is actually required to develop various couple programs about enhancing sexual satisfaction related to the effective couple communication and problem-solving methods. It also have to imply the requirements considering characteristics of male and female, husbands and wives.

• Journal of the Korean Society of Visualization
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• v.19 no.3
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• pp.99-105
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• 2021

In this study, the thermal stratification in solar seasonal thermal storage tanks was numerically simulated. The effects of the aspect ratio (AR) and inlet velocity on the thermal stratification in the diffuser type heat storage tank were investigated. The temperature distributions inside the tank were similar with velocity fields. Jet flows from opposite diffusers encountered each other at the tank center region. Thereafter, the downward flows occurred, and this flows strongly affected the thermal stratification. When AR was smaller than 2, these downward flows influenced a further distance and enhanced mixing inside the tank. Thermal stratification was evaluated by thermocline thickness and degree of stratification, and AR of 3 had the highest degree of stratification. The inlet velocity effect was expressed with the ratio (Re/Ri) of Reynolds and Richardson numbers. The second-order approximation was found for the relationship between the thermocline thickness and log Re/Ri.

• Korean Journal of Childcare and Education
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• v.18 no.6
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• pp.59-73
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• 2022

Objective: The purpose of this study is to verify the effect of early childhood teacher's constructivist educational beliefs and teaching efficacy on creative teaching behavior. Methods: The subjects of this study were 262 early childhood teachers working in daycare centers and kindergartens all over the country. A questionnaire was administered which assessed early childhood teacher's constructivist educational beliefs, teaching efficacy, and creative teaching behavior. SPSS 28.0 was used for data analysis. Results: First, the constructivist educational beliefs of early childhood teachers had a positive effect on teaching efficacy. Second, it was found that early childhood teachers' constructivist educational beliefs and teaching efficacy had a positive effect on creative teaching behavior, and at the same time, early childhood teachers' constructivist educational beliefs were partially mediated by teaching efficacy. Conclusion/Implications: This study revealed the mediating effects of teaching efficacy in constructivist educational beliefs and creative teaching behavior relationships. Therefore, in order to promote creative teaching behavior of early childhood teachers, efforts should be made to increase teaching efficacy based on constructivist educational beliefs.

• Korean Journal of Childcare and Education
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• v.17 no.6
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• pp.29-52
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• 2021

Objective: The purpose of this study was to investigate the mediating effects of the parent-teacher trust relationship and cooperative behavior in the relationship between the emotional intelligence of infant teachers and their play teaching efficacy. Methods: A total number of 216 teachers in charge of infants under the age of two at childcare centers located in H, Y, and O cities in Gyeonggi-do participated in the survey. Using SPSS 23.0 and AMOS 22, descriptive statistics, correlation and structural equation model were analyzed. Results: First, the emotional intelligence of infant teachers had a direct effect on play teaching efficacy. Second, the emotional intelligence of infant teachers influenced play teaching efficacy through parent-teacher's trust relationship. Third, the emotional intelligence of infant teachers influenced play teaching efficacy through parent-teacher cooperative behavior. Fourthly, it was found that the parent-teacher trust relationship and cooperative behavior were mediated sequentially in the influence of the emotional intelligence of infant teachers on play teaching efficacy. Conclusion/Implications: The results of this study emphasize the importance of improving the emotional intelligence of teachers and the trust and cooperation between parents and teachers in order to increase the ability of early childhood teacher's play teaching efficacy.

• Advances in nano research
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• v.14 no.3
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• pp.261-271
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• 2023

The present study follows three main goals. First, an analytical solution with high accuracy is developed to assess the effects of embedding pre-strained shape memory alloy (SMA) wires on the critical buckling temperatures of rectangular sandwich plates made of soft core and graphite fiber/epoxy (GF/EP) face sheets based on piecewise low-order shear deformation theory (PLSDT) using Brinson's model. As the second goal, this study compares the effects of SMAs on the thermal buckling of sandwich plates with those of carbon nanotubes (CNTs). The glass transition temperature is considered as a limiting factor. For each material, the effective ranges of operating temperature and thickness ratio are determined for real situations. The results indicate that depending on the geometric parameters and thermal conditions, one of the SMAs and CNTs may outperform the other. The third purpose is to study the thermal buckling of sandwich plates with advanced hybrid SMA/CNT/GF/EP composite face sheets. It is shown that in some circumstances, the co-incorporation of SMAs and CNTs leads to an astonishing enhancement in the critical buckling temperatures of sandwich plates.

• Journal of Distribution Science
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• v.21 no.8
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• pp.83-96
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• 2023

Purpose: This study examined the relationship between the factors (Credibility, Usability) and user Innovativeness of the ChatGPT on TRA (Theory of Reasoned Action; Subjective Norm, Attitude) and Switching Intention. TRA and Innovation Diffusion Theory (IDT) were used. Research design, data and methodology: From April 26 to 27, 2023, an online panel survey agency was commissioned to conduct a survey of GhatGPT users in their 20s and 40s in Korea, and a total of 210 people were used for the final analysis. Verification of the research model was performed using SPSS and AMOS. Results: First, ChatGPT factors (Credibility, Usability) were found to have positive effects on TRA (Subjective Norm, Attitude). Second, ChatGPT user Innovativeness was found to have a positive effect on TRA (Subjective Norm, Attitude). Third, ChatGPT users' TRA (Subjective Norm, Attitude) were found to have positive effects on Switching Intention. Conclusions: These results mean that the superior Usability and Credibility of ChatGPT and the Innovativeness of users have a significant effect on the Switching Intention from existing Portal Service (Naver, Google, Daum, etc.) to ChatGPT. Generative AI such as ChatGPT should strive to develop various services such as improving the convenience of functions so that innovative users can use them easily and conveniently in order to provide services that meet expectations.

• Steel and Composite Structures
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• v.44 no.5
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• pp.651-676
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• 2022

Most of the experimental, theoretical, and numerical studies on the stability of functionally graded composites are deterministic, while there are full of complex interactions of variables with an inherently probabilistic nature, this paper presents a non-intrusive framework to investigate the stochastic nonlinear buckling behaviors of porous functionally graded cylindrical shells exposed to inevitable source-uncertainties. Euler-Lagrange equations are theoretically derived based on the three variable refined shear deformation theory. Closed-form solutions for the shell buckling loads are achieved by solving the deterministic eigenvalue problems. The analytical results are verified with numerical results obtained from finite element analyses that are conducted in the commercial software ABAQUS. The non-intrusive framework is completed by integrating the Monte Carlo simulation with the verified closed-form solutions. The convergence studies are performed to determine the effective pseudorandom draws of the simulation. The accuracy and efficiency of the framework are verified with statistical results that are obtained from the first and second-order perturbation techniques. Eleven cases of individual and compound uncertainties are investigated. Sensitivity analyses are conducted to figure out the five cases that have profound perturbative effects on the shell buckling loads. Complete probability distributions of the first three critical buckling loads are completely presented for each profound uncertainty case. The effects of the shell thickness, volume fraction index, and stochasticity degree on the shell buckling load under compound uncertainties are studied. There is a high probability that the shell has non-unique buckling modes in stochastic environments, which should be known for reliable analysis and design of engineering structures.

• Korean Journal of Childcare and Education
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• v.19 no.6
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• pp.55-77
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• 2023

Objective: The purpose of this study was to evaluate the empathy of children aged 4 to 5 through the empathy interview tool and to verify the effects of children's and mothers' variables on the children's empathy. Methods: The subjects of this study were 102 pairs of children aged 4 to 5 and their mothers. The research was conducted through children's interviews and mothers' questionnaires. The data were analyzed using Pearson's correlation and multiple regression analysis. Results: First, girls exhibited a higher level of empathy than boys. Second, significant correlations were found between mothers' empathy, parenting behavior, emotional expression, and children's empathy. Third, the influences of independent variables on children's empathy followed the order of mothers' emotional empathy, positive emotional expression, and children's gender. Conclusion/Implications: This study identified variables in children and their mothers that influenced children's empathy. These findings contribute to a deeper understanding of children's empathy and can serve as fundamental data for intervention programs aimed at enhancing children's empathy.