• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.15 no.12
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• pp.1079-1084
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• 2002

Because complex insulation method is used in EHV(extra high voltage) insulation systems, macro Interfaces between two different bulk materials which affect the stability of insulation system exist inevitably. Interface between toughened epoxy and silicone rubber was selected as a interface in EHV insulation systems and tested AC interfacial breakdown properties with variation of many conditions to influence on electrical Properties, such as interfacial pressure, roughness and oil. Specimen was designed to reduce the effect of charge transport from electrode in the process of breakdown and to have the tangential electrical potential with the direction of the interface between epoxy and silicone rubber by using FEM(finite elements method). It could control the interfacial pressure, roughness and viscosity of oil. From the result of this study, it was shown that the interfacial breakdown voltage is improved by increasing interfacial Pressure and oil. In particular, the dielectric strength saturates at certain interracial Pressure level. The decreasing ratio of the interfacial breakdown voltage in non-oiled specimen was increased by the temperature rising, while oiled specimen was not affected by temperature.

• Journal of the Korean Geographical Society
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• v.42 no.4
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• pp.560-581
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• 2007

The purpose of this paper is to present a conceptual framework and a stage of development of trust building and to study the factors affecting on the trust building in economics space. Conceptual framework on trust building in economics space is combined of in the three approaches. The macro(structural and institutional) approach includes normative and regulative factors(laws, norms), and positionality in social and economic systems(beliefs, political ideologies, institutions). The meso(intersubjective) approach contains the personal fronts(expressive factors, social cues, significant symbols) and settings(physical space, intermediary such as technologies & knowledges). The micro(subjective) approach comprises the willingness(internalization of value) and calculation(risk and uncertainties analysis) of economic actors. According to sustainable cooperation among economic actors, trust building to the macro(structural and institutional) level, the meso(intersubjective) level, and the micro(subjective) level develop by stages. The factors such as long-term and repeated interaction, information sharing and reciprocity, interdependence and asset specificity, uncertainty, proximity, and culture & norm of corporate and formal institution are determinants on the trust building across economic actors in economic space.

• The Journal of the Convergence on Culture Technology
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• v.10 no.6
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• pp.151-157
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• 2024

The purpose of the study was to investigate social support as a mediator in the relationship between social activity and successful aging among older adults. For this purpose, the non-ramdom purposive sampling and snowball sampling procedure were used to select the older adults over 65 years old who registered at the Senior Welfare Center in Daegu and Kyungpook and data were collected from 254 elderly. SPSS and PROCESS Macro Program were utilized to analyze the collected data. Findings of this study showed that participation in social activity, social support and successful aging were positively related among older adults, and those who participate in social activity actively and perceive higher level of social support seemed to experience higher level of successful aging. Moreover, the participation in social activity and social support were statistically significant factors in explaining the variance of successful aging, and social support was a statistically significant mediator in the effect of participation in social activity on the successful aging among older adults. Finally, based on the results of this study, the practical implication for the improving successful aging among older adults and the further research were recommended.

• The Transactions of the Korean Institute of Electrical Engineers A
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• v.53 no.5
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• pp.285-295
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• 2004

The outage cost assessment has an important position for determination of the optimal level or optimal range of reliability for power system expansion planning. Establishing the worth of service reliability is a very difficult and subjective task. While the utility cost(reliability cost) will generally increase as consumers are provided with higher reliability, the consumer costs(reliability worth) associated with supply interruptions will decrease as the reliability increases. The total costs to society are the sum of these two individual costs and the optimum or target level of reliability is achieved at minimum point of the total cost curve. This paper addresses the role, need and assessment algorithms and methodologies of the outage cost in power system expansion planning. In a case study, the outage cost has been assessed using macro approach for our country 15years(1986-200l) in the case study. Additionally, determination processing of optimum reliability level is presented in another case study with the five buses MRBTS.

• Journal of Digital Convergence
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• v.16 no.6
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• pp.371-383
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• 2018

The purpose of this study was to examine the effects of sex and gender role identity on college life adaptation. The participants were 142 male and 146 female students. The university life adaptation scale and gender role identity scale were carried out, and we conducted a parallel multiple mediator model using Process macro. As a result, while the effect of sex on adaptation level and resources was significant, the explanatory power increased to a meaningful level when effect of gender role identity was considered. In the adaptation level, the effects of masculinity and femininity are similar in magnitude, but in the resources, masculinity has a more positive effect. Finally, male students were mediated through masculinity and female students were mediated through femininity, which has a positive effect on adaptation. These results suggest a differentiated guidance direction according to sex and identity, and suggest that enterprising and challenging spirit is important.

• Journal of the Korean Data and Information Science Society
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• v.18 no.4
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• pp.1023-1032
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• 2007

We introduce the statistical system of the Commonwelth Independence State(CIS) countries located in the Central Asia. At present, the level of the national statistics production system of Korean National Statistical Office(NSO) is very high and locate on just behind Japan among all asian countries, and they are also trying to reach the statistics quality level upto the advanced developed countries in the world. To have the optimal Statistics production processing, we must understand the methodologies parts as well as the aspect of the macro statistics that can be applied to the country#s economic plan. Like the history is repeated, it is valuable to look at the development history of statistical system of other countries one century ago. We study the relationship among CIS countries along with the history of Russian statistics development. It will be helpful to look and understand the statistical system of CIS countries including Russia to use their statistics for international comparison study.

• THE INTERNATIONAL COMMERCE & LAW REVIEW
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• v.61
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• pp.303-325
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• 2014

As the development of information and globalization of world economy enters new condition, the stake of every nation's makes more complwx, and multilateral negotiation lead by WTO is seriously delayed. But the number of agreement about FTA increase exponentially. In this study we aim to consider whether Korean FTA affects the relation of the trade of Korea and Japan or not, especially Automobile industry. The composition of this paper is as follows. Chap. 1 is Introduction. In Chap. 2, we consider the change of the Trade Policy of Korea focusing in FTA. In Chap. 3, we consider how Korean FTA affect the structure of Japan's Trade, especially the automobile industry of Korea and Japan. In Chap. 4, we have conclusion. As the conclusion, the impact to the automobile industry of Korea and Japan is that Korean FTA works to Korean automobile industry advantageously in micro level, but in macro level, the competition of world automobile industry move into a next generation technology market.

• East Asian Economic Review
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• v.28 no.3
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• pp.315-357
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• 2024

The rapid development of China's digital economy has enabled China to lead the world in financial technology (FinTech). In this context, it is imperative to study the impact of FinTech at the macro level on the sources of R&D financing for micro-enterprises. Using the data of A-share listed companies on the main boards of China's Shanghai and Shenzhen cities and the municipal-level FinTech development index from 2011 to 2020, this paper conducts an empirical test by applying the system generalized method of moments estimation (system GMM). Fintech facilitates firms' external financing of R&D. There is significant heterogeneity across different types of firms, with fintech facilitating R&D financing more strongly for young and non-state firms. This study not only complements the literature on the impact of fintech on R&D financing but also has essential practical guidance significance, which can provide valuable guidance and assistance to different types of enterprises in their R&D financing decision-making process.

• Journal of Environmental Science International
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• v.23 no.2
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• pp.291-302
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• 2014

We have studied characteristics of community structure on the benthic macro-invertebrates at twelve selected sites in upstream, midstream and downstream of Paemsagol, Piagol, Chilseongol and Daeseonggol, major streams of Jirisan Mountain, for three years from April 2008 to September 2010. As a result, 2 phyla, 3 classes, 11 orders, 41 families, 119 species and 4,449 individuals of benthic macro-invertebrates have been collected and classified in this study. Among them EPT group (Ephemeroptera, Plecoptera, Trichoptera), commonly appearing taxa in clean stream ecosystem, was found most frequently. The highest species number of benthic macro-invertebrates were collected in 2008, the year with lower climatic influence including heavy rain. In almost all of survey sites 80% or over of EPT group were counted, and St. 1 scored highest rate of EPT group at 92.59%. Most dominant species was Ecdyonurus kibumensis at 12.83% of dominance index, and subdominant species was Goerodes KUb at 6.81% of dominance index. The investigation of the feeding function group indicated that gathering-collectors were dominant with 26 species and 1,334 individuals, while the number of filtering-collectors was lowest with 11 species and 230 individuals. This result represents that the feeding function group of Jirisan Mountain is mountainous stream-specific one. Both diversity index and richness index were lowest at the midstream of Chilseongol (St. 5), while the midstreams of Daeseonggol (St. 11) and Piagol (St. 8) were highest in diversity and richness indices respectively. The analyses of linear regression and correlation were performed in order to investigate and to predict the appearance aspect of EPT group by altitude. The results showed that the ratio of Plecopteran species number has increased by the elevation of the altitude at 0.05 significance level. Cluster analysis was also carried out for evaluating environmental similarities among survey sites. As a result, upper regions of Paemsagol (St. 1) and Piagol have clustered as most similar sites each other, while the midstream of Piagol (St. 8) has separated with lower similarity value than other sites in species composition.

• Journal of Families and Better Life
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• v.26 no.1
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• pp.51-67
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• 2008

The study analyzes divorce rates in Korea and makes suggestions for the future research of divorce rates. Based on the data from Korea Statistical Information System (KOSIS) of the National Statistics Organization, trends for divorce rates change and the relations between divorce rates and macro environmental factors are analyzed. Macro environmental factors include socioeconomic factors such as, Korean War, Vietnam War, oil shock, IMP economic crisis and gross national income (GNI), whereas demographical factors include population structure, rates of female labor participation, and geographical location. The principle characteristics of divorce rates are as follows: 1) the Crude divorce rates (CDR) and the number of divorced had been increased from 1970 to 2004, then the trend changed to a decrease; 2) the slope of the change were the highest during 1998 to 2004 after the IMP economic crisis. The relations between socioeconomic factors are as follows: 1) during the war there was a small increase of CDR for a short period of time; 2) the economic crisis of the nation tend to increase the CDR, while the IMP economic crisis had a strong impact on an increase of CDR because of the interaction effect among the population structure, women's sex role changes as well as the level of standard of living. The increase in CDR from 1990 to 2000 can be explained partly by the population of baby Boomers passing through their marriage and divorce process. The number of population residing in the rural area and the middle class households, and the mobility of population also had an impact on the divorce rates changes. The recommendations for the future research were as follows: 1) the need to develop new divorce statistics that are based on a marriage cohort or a birth cohort because family behavior is a mixture of personal, social and political responses, and because CDR is not an accurate measure of divorce rate since it was influenced by population structure; 2) the need to include micro personal factors as well as macro social factors in a model to find an interaction effect between those variables.