• 한국식생활문화학회지
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• 제36권3호
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• pp.284-292
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• 2021

The food service industry has grown larger with changes in the economic and socio-cultural environment. In this saturated food service industry, generation X and MZ are the main consumer forces that demand attention. That is because a generation is the main psychographic factor that reflects personal values and lifestyle based on one's life cycle. From such a perspective, a generation in marketing has been used as a variable to predict a market by supplementing demographic factors. Accordingly, this study classified generations into generation X and generation MZ with the use of the 2019 consumer behavior survey for food by Korea Rural Economic Institute (KREI) and then investigated the factors influencing group and personal dining-out expenses. The analysis was carried out applying the Tobit model using SPSS and R. The positively influential variables on generation X's personal dining-out expenditure were male, single person, high income and simple lifestyle, whereas housewives, personal ethical consciousness, behavioral ethical consciousness, and safe dietary life were negatively influential variables. The positively influential variables on generation MZ's personal dining-out expenditures were male, dual-income, high education level, corporate and governmental ethical consciousness, while the number of family members and safe dietary life were negatively influential variables.

• 한국가축번식학회지
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• 제22권3호
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• pp.237-244
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• 1998

To investigate the fidelity of transgene transmission and expression, we produced transgenic mice carrying bovine $\beta$-casein/bovine grwoth hormone(bGH) fusion gene and examined transmission efficiency and expression level of the transgene in the founders and their progeny. The transgene was composed of 1.8 kb bovine $\beta$-casein promoter and 2.1 kb bGH gene. Ten transgenic mice were produced. Milk and mammary gland were collected from eight transgenic lines at 10-day lactation and a, pp.ied to Western and Northern blot analyses. The bGH expression was detected in four of them. The concentrations of bGH in milk were highly variable from 4$\mu\textrm{g}$/ml to 600$\mu\textrm{g}$/ml depending on the lines. The bGH mRNA level in mammary gland was closely correlated with the bGH concentration in milk in each transgenic line. These results indicated that bGH transgene expression was a, pp.opriately regulated in the mammary gland and secreted into milk in transgenic mice. By using two transgenic lines(#2, #7) secreting a considerable amoung of bGH into their milk, the inferitance and maintenance of transgenic phenotype were assessed in successive four generations. The mean transmission frequencies of transgene in lines #2 and #7 were 34% and 40%, respectively. The bGH concentration in milk were 80, 240, 120, 60$\mu\textrm{g}$/ml in each G0(generation 0), G2, G3, G4 generation of line #2 and 600, 1600, 860, 900$\mu\textrm{g}$/ml in each G1. G2, G3, G4 generation of line #7. These results demonstrated that bovine $\beta$-casein/bGH gene was stably transmitted from generation to generation in a Menelian fashion in trasgenic mice and consistenly expressed in their milk throughout the generations, although there was a little variation in the transmission frequency and expression level of the transgene between generations.

• 한국수학교육학회지시리즈C:초등수학교육
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• 제19권1호
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• pp.79-112
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• 2016

본 연구의 목적은 구성주의를 기반으로 하는 학습자 중심 수학 수업이 학생들의 추론능력과 지식 구성 수준에 미치는 영향을 알아보는데 있다. 이를 위해 초등학교 4학년 분수 단원을 구성주의 수학 수업으로 재구성하여 수업을 실천하고, 학생들의 추론능력과 분수 지식 생성 수준에 미치는 영향을 알아보았다. 분석 결과로부터 다음과 같은 결론을 얻을 수 있었다. 구성주의를 바탕으로 한 학습자 중심 수업은 교사 중심 수업보다 학생들의 추론능력과 학습한 내용에 대한 재생력, 학습하지 않은 지식의 생성력에 긍정적인 영향을 준다. 구성주의를 바탕으로 한 학습자 중심 수업은 교사 중심 수업보다 분수 지식 생성 수준을 향상시키는데 효과가 있다. 구성주의를 바탕으로 한 학습자 중심 수업은 수학적 추론능력을 발달시켜 지식 생성 능력 수준을 향상시킨다. 또한, 추론능력과 분수 지식 생성 능력이 학습자 중심 수업을 받은 학생들에게서는 상관이 있었으며 교사 중심 수업을 받은 학생들은 추론능력이 높아도 생성하지 못하는 경우가 많았으나 실험집단은 추론능력이 높으면 지식 생성이 가능하였다. 따라서 학습자 중심 수업은 학생들의 추론능력에 긍정적인 영향을 미치며 이를 통해 지식 생성 수준도 향상될 수 있다.

• 한국해양공학회지
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• 제29권4호
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• pp.317-321
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• 2015

Many kinds of generation systems have been developed to use ocean energy. Among these, with the use of an oscillating water column (OWC) for power generation is attracting attention. The OWC-type wave power generation system converts wave energy into electricity by operating a generator turbine with the oscillating water level in a column of water. There are two ways to convert wave power into electricity using an OWC. One uses a cross-flow turbine using the water level inside the OWC. The other method uses the flow of air in a Wells turbine, which depends on the water level. An experiment was carried out using a 2-D wave tank in order to minimize the number of empirical tests. The design factors were taken from Koo et al. (2012) and the experimental environment assumed by free surface motion. This paper deals with characteristics of two types of wave energy conversion systems combine with a breakwater. One model uses an air-driven Wells turbine and a cross-flow water turbine. The other type uses a cross-flow water turbine. Wave energy converters with OWCs have mostly been studied using air-driven Wells turbines. The efficiency of the cross-flow turbine was about 15% higher than that of the other model, and the water level of the OWC internal chamber for the cross-flow water turbine and air-driven Wells turbine was less than about 40% lower than the one using only the cross-flow water turbine.

• Corrosion Science and Technology
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• 제20권5호
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• pp.308-314
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• 2021

Neutron dose level at bottom head of a reactor pressure vessel (RPV) was calculated using reactor vessel neutron transport for a Korean nuclear power plant A. At 34 EFPY with a 40-year (2042) design life after plating repair, irradiation fast neutron effect was 6.6x10¹⁵ n/cm². As helium(He) gas can be generated by Ni only at 1/10⁶ level of 5 × 10²¹ n/cm², He generation possibility in the Ni plating layer is very little during 40 years of operation (2042, 34 EFPY). Thermal neutrons can significantly affect the generation of He from Ni metal. At 10 years after a repair, He can be generated at a level of about 0.06 appm, a level that can add general welding repair without any consideration. After 40 years of repair, 9.8 appm of He may be generated. Although this is a rather high value, it is within the range of 0.1 to 10 appm when welding repair can be applied. Clad repair by Ni electroplating technology is expected to greatly improve the operation efficiency by improving the safety and shortening the maintenance period of the nuclear power plant.

• 전력전자학회논문지
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• 제21권6호
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• pp.481-485
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• 2016

When analyzing economic feasibility for installing a PV generation plant at a certain location, the prediction of possible annual power production at the site using the target PV panels should be conducted on the basis of the local weather data provided by a local weather forecasting office. In addition, the prediction of PV generating power under certain weather conditions is useful for fault diagnosis and performance evaluation of PV generation plants during actual operation. This study analyzes PV cell characteristics according to a variety of weather conditions, including ambient temperature and irradiance level. From the analysis and simulation results, this work establishes a proper model that can predict the output characteristics of PV cells under changes in weather conditions.

• 한국주거학회:학술대회논문집
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• 한국주거학회 2005년도 추계학술대회 논문집
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• pp.51-56
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• 2005

The purpose of this study was to examine the needs of apartment residents for community programs by generations. For this study, the data from the focus group interview(35 participants) and the questionnaire survey(186 participants) were analyzed. The major results were as follows; 1) The residents in different generations had different characteristics and life values. Y generation showed higher value in Technology/Consumption/Individual than other generations. BB generation had higher value both in Health/Property/Family and Prudence/Reality. G generation scored a higher level in Tradition/Conservatism. 2) The residents in all generations showed a high level in needs of community programs and especially higher rates in needs of communication programs items. However, there were gaps in program needs among different generations. Therefore, the community programs should be specialized provided by considering unique needs of different generations.

• 가정과삶의질연구
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• 제22권5호
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• pp.253-264
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• 2004

The objective of this study was to investigate the change of the level of the performance of family rituals and socialization of them, and to compare the change of the attitudes between daughter and mother generation. Research data were collected in 1992 and 2002 from families living in Seoul. Housewives and university students from these families completed the questionnaires. Major findings were as follows: Most of the family performed the birthday parties, traditional rituals, and memorial days. The level of the performance of the birthday rituals, and rituals from western culture has increased for a decade. The socialization of the following family rituals is increasing: banquets for parents' 60th birthday, wedding anniversaries, employment ceremony, commencement ceremony. There was significant difference in the attitude between younger and older generations regarding performance of the family rituals between 1992 and 2002.

• Journal of Electrical Engineering and Technology
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• 제13권1호
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• pp.78-88
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• 2018

The liberalization of electricity market and environmental concerns are the major driving forces for the development of Distributed Generation (DG). The mode of grid-connected wind power generation is becoming popular and has matured as a reliable DG technology. The voltage generated by the wind generator is stepped up to the higher voltage by the transformers before connecting to the grid. Operating algorithm of the differential relays for transformer protection used in the wind farms need to be modified to take care of the dynamic nature of fault current caused by the intermittent nature of the wind power. An algorithm for the differential relay is proposed in which dual slope characteristics are adjusted with varying fault level situation according to the wind generator in service as well as with the wind speed. A case study conducted for a typical wind farm shows that the proposed method avoids mal-operation of the differential relay in varying wind power conditions.

• 가족자원경영과 정책
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• 제3권2호
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• pp.1-16
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• 1999

The purpose of this empirical study is to examine the effect of leisure facilities preferences and leisure activities of new-generation married women on their life satisfaction. The samples was composed of 195 married women under 35 years. old, selected by age and local distribution. The major findings of this study re as follows. The new-generation wives preferred culture.intellectual arts facilities to sport facilities to sport facilities and participated in home-oriented activities. The more new-generation married women participated in active leisure, the higher level they showed in life satisfaction. There is no significant affect of leisure facilities preference on life satisfaction. The finding of this study provide implications regarding the policies on leisure facilities and leisure education programs to enhance the quality of life of the new-generation wives, such as establishing community leisure facilities which can help the mother as well as young children enjoy their leisure activities with less expense, and managing continuing education programs in which the new-generation wives easily participate with their families.