• Nuclear Engineering and Technology
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• v.55 no.3
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• pp.1105-1117
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• 2023

In this study, the pressure drop behavior of single- and two-phase flows of air and water through the porous beds filled with uniform and non-uniform sized spherical particles was examined. The pressure drop data in the single-phase flow experiments for the uniform particle beds agreed well with the original Ergun correlation. The results from the two-phase flow experiments were analyzed using numerical results based on three types of previous models. In the experiments for the uniform particle beds, the data on the two-phase pressure drop clearly showed the effect of the flow regime transition with a variation in the gas flow rate under stagnant liquid condition. The numerical analyses indicated that the predictability of the previous models for the experimental data relied mainly on the sub-models of the flow regime transitions and interfacial drag. In the experiments for the non-uniform particle beds, the two-phase pressure loss could be predicted well with numerical calculations based on the effective particle diameter. However, the previous models failed to accurately predict the counter-current flooding limit observed in the experiments. Finally, we propose a relation of falling liquid velocity into the particle bed by gravity to appropriately simulate the CCFL phenomenon.

• International Journal of Human Ecology
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• v.5 no.1
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• pp.83-95
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• 2004

The purpose of the study was to examine the determinants of financial well-being of the baby boomers. With data on 1,789 households from the 1998 Survey of Consumer Finances, the study provided a profile of baby boomers using demands, resources, financial attitudes, and financial practices. The descriptive statistics showed that 18% of the baby boomers were financially well off showing that they met the guidelines for two financial ratios: liquidity and solvency ratio. The results of logistic analysis on the measures of financial well-being revealed that financial management practices played an important role in predicting boomer's financial well-being. This suggested a positive approach of financial education to the baby boomers to help them manage their current finance well as well as prepare for their retirement.

• Journal of Families and Better Life
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• v.26 no.6
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• pp.71-82
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• 2008

The purpose of this study was to identify factors affecting the purchases of well-being tea drinks based on the analysis of demographic characteristics, well-being oriented consumer behaviors, and consumer consciousness toward well-being tea drinks. The subjects of this study were undergraduates and graduate students in Seoul. The findings were summarized as follows: 1. Well-being oriented consumer behavior patterns were categorized in three factors; non-dietary life, selective dietary life, and regular/temperate behavior and consumer consciousness toward well-being tea drinks were categorized in two factors; habit/ familiarity and health/ economical efficiency. 2. Multiple regression analysis was used for finding out factors affecting the purchases of well-being tea drinks; independent variables were demographic characteristics(sex, monthly average family income and the amount of personal expenditure), well-being oriented consumer behavior factors and consumer consciousness factors toward well-being tea drinks. Weekly purchase frequency of well-being tea drinks was defined as a dependent variable. As a result, the purchases of well-being tea drinks were influenced in order of regular/temperate behavior, the consciousness of health/ economical efficiency, the amount of personal expenditure and the consciousness of habit/ familiarity. Especially, regular/temperate behavior negatively affected the purchases of well-being tea drinks.

• The Journal of the Korea Contents Association
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• v.18 no.2
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• pp.57-72
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• 2018

Choi Dong-hoon's films tend to have not been well treated academically in Korea. But from the point of view that his works have succeeded in box office and survived in the market for some reason, there seems to be new possibilities to treat them. In this paper, the two movies with ten million audiences, and that are Choi's original scenario and caper film genre are tried to examine the success factors in box office on "making well made story". Often, well-made films have both genre-customary and creative aspects. Choi Dong-hoon's movies are the same. and faithfully follow the rules of caper film genre. At the same time, these two films have complex adaptive systematic creativity, in which multiple characters are self-organizing with their story patterns actively. And since there is a proper coexistence of customary and original aspects in the and , these two films are seemed to be at the edge of the chaos, which is the most market adaptable.

• The Journal of Korean Academic Society of Nursing Education
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• v.23 no.1
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• pp.5-14
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• 2017

Purpose: The purpose of this study was to examine the effects of the mental health promotion program based on Positive Psychology for adolescents with problem behavior. Methods: The study used a nonequivalent control group pretest-posttest design. Eligible participants were first grade students in two high schools in K Province. The inclusion criteria for the study were those with scores in the upper 15% on the Korean Youth Self-Report. A total of 74 participants were assigned to an 8-session program (n=38) or to a control (n=36) group. The outcome variables were psychological well-being, depression, and self-esteem. Results: There were no statistically significant differences in demographic variables or outcome variables, except self-esteem, between the two groups at the baseline. The experimental group had higher mean scores on psychological well-being and self-esteem and a lower mean score on depression. There were significant differences in psychological well-being (t=3.45, p=.001), self-esteem (F=5.45, p=.022), and depression (t=-2.80, p=.007) between the two groups. Conclusion: The mental health promotion program based on Positive Psychology was effective in decreasing depression as well as improving psychological well-being and self-esteem for adolescents with problem behavior. This study contributes to suggesting a framework for promoting mental health for high school students with problem behavior.

• Korean Journal of Culture and Social Issue
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• v.14 no.1
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• pp.19-45
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• 2008

The present study investigated the relationship between the perceptions of social change and subjective well-being, and the effectiveness of coping resources in such a relationship by comparing the structural equation models of the samples obtained in two countries (Korea and the United States). Participants in two countries reported their perceived pace of social change, evaluation of social change, subjective well-being, personal resources(self-esteem and self-efficacy), and social resources. Based on the survey data, a structural equation models was developed and compared across two samples to examine the moderation effects of coping resources by culture and nations. As a result, it was revealed that the perceived pace of social change affected subjective well-being through the mediation of the evaluations of social change and that there were differences in the effectiveness of coping resources: social resources had stronger effects for the Korean sample whereas personal resources had stronger effects for the U.S. sample. Discussions on the psychological impact of a new type of social stress, social change, is included.

• Journal of Environmental Impact Assessment
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• v.9 no.4
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• pp.349-362
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• 2000

In the study, the feasibility of landscape ecological measures as indices system for interpretation and evaluation of regional ecosystem was investigated through the application to Yongin City. Each patch metrics well showed the class structure and supplemented the class metrics, and class metrics also showed well the landscape structure and supplemented the landscape metrics. And the change analysis through subtraction of two set of landscape ecological measurement in two point of time showed the dynamic trends very well. One of the dynamic trends in Yongin City was the rapid fragmentation. While there was no landcover data on Yongin City, using Landsat data and remote sensing techniques were proved to be efficient and effective to produce the digital landcover data.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.26 no.6
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• pp.421-424
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• 2013

The Hall factor in a quantum well structure with X or L-type indirect conduction valleys is calculated for various strain conditions. The two-dimensional constant energy surfaces of occupied valleys are proven to be identical. As a result, the Hall factor depends on the relative direction of occupied valleys to the growth direction, regardless of the number of occupied valleys. This work is widely applicable to the two-dimensional structure with indirect conduction minima for any growth direction and under different strain conditions.

• Progress in Superconductivity and Cryogenics
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• v.21 no.3
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• pp.6-12
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• 2019

Extended Drude model has been used to obtain information of correlations from measured optical spectra of strongly correlated electron systems. The optical self-energy can be defined by the extended Drude model formalism. One can extract the optical self-energy and the electron-boson spectral density function from measured reflectance spectra using a well-developed usual process, which is consistent with several steps including the extended Drude model and generalized Allen's formulas. Here we used a reverse process of the usual process to investigate the extended Drude analysis when an additional low-energy interband transition is included. We considered two typical electron-boson spectral density model functions for two different (normal and d-wave superconducting) material states. Our results show that the low-energy interband transition might give significant effects on the electron-boson spectral density function obtained using the usual process. However, we expect that the low-energy interband transition can be removed from measured spectra in a proper way if the transition is well-defined or well-known.

• East Asian mathematical journal
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• v.38 no.3
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• pp.339-346
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• 2022

In this paper, a comparison of two types of quantitative two weight conditions for the boundedness of the dyadic paraproduct and the commutator of the Hilbert transform is provided. In the case of the commutator [b, H], the conditions of the well-known Bloom's inequality [2] and the slightly different types of two weight inequality introduced in [1] are compared around the A₂-conditions on weights and the novel conditions on the function b.