• Journal of Korea Water Resources Association
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• v.54 no.12
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• pp.1305-1316
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• 2021

In this study, a new empirical formula for 2D transverse dispersion coefficient was developed using the results of previous tracer test studies, and the performance of the formula was evaluated. Since many tracer test studies have been conducted under the conditions where the width-to-depth ratio is less than 50, the existing empirical formulas developed using these imbalanced tracer test results have limitations in applying to rivers with a width-to-depth ratio greater than 50. Therefore, in order to develop an empirical formula for transverse dispersion coefficient using the imbalanced tracer test data, the Synthetic Minority Oversampling TEchnique (SMOTE) was used to oversample new data representing the properties of the existing tracer test data. The hydraulic data and the transverse dispersion coefficients in conditions of width-to-depth ratio greater than 50 were oversampled using the SMOTE. The reliability of the oversampled data was evaluated using the ROC (Receiver Operating Characteristic) curve. The empirical formula of transverse dispersion coefficient was developed including the oversampled data, and the performance of the results were compared with the empirical formulas suggested in previous studies using R². From the comparison results, the value of R² was 0.81 for the range of W/H < 50 and 0.92 for 50 < W/H, which were improved accuracy compared to the previous studies.

• The Journal of the Korea Contents Association
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• v.22 no.6
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• pp.261-272
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• 2022

During the China's long history, many ethnic groups have developed their own traditions of local music which is an important part of their precious cultures. Meanwhile, each ethnic group developed its own worldview and music culture according to its unique living environment, special lifestyle and mode of production. The clarinet is a Western instrument, and has been influenced to some extent by Chinese minority culture while being introduced to China. Therefore, musicians tried to find ways of using Western musical instruments to express various elements of Chinese minority music. Focusing on two clarinet works 'The Song of Grazing Horses' by Wang Yan and 'The Sound of Pamir Clarinet Concerto' by Hu Bijing, this paper aims to analyze the musical characteristics of minority groups expressed by the clarinet in two aspects: the formation of the music style, the artistic characteristics conveyed through the works. Specifically, it consists of five parts: ethnic mode and tonality, rhythm, time signature, melody making, and imitation of animals. It also analyzes the cultural characteristics of Tajik and Mongolian music reflected in the two works in combination with living environment, mode of production, life style, and ethnic emotions. This study aims to provide a theoretical basis for composers and performers who want to understand and acquire the musical style of modern Chinese clarinet works. It also helps to find a better way to play traditional Chinese music with Western instruments.

• Korean Journal of Social Welfare Studies
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• v.42 no.2
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• pp.381-417
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• 2011

The primary goal of this study is to examine the factors that affect how satisfied sexual minorities are with their lives. This study focuses on how sexual minorities perceive social stigma, the social influences involved in its perception, and the effects this perception has. Using stress-coping theory, this study looks at how social stigma, as a perceived stress, affects social support and self-esteem, how the stigma influences the degree to which individuals "come out" in an effort to cope, and the resultant effects of this coping mechanism on life satisfaction. The data used if from a sample of 478 individuals who self identify as gay, lesbian or bisexual. It was collected through an online survey. Using SEM, the quality was evaluated by analyzing the measurement model, and the relationship of the variables included in the theoretical model was verified by analyzing the structural model. The results of this study show that social stigma directly affects the life satisfaction of Korean sexual minorities. It significantly influences the social support they receive(from family and sexual minority peers), and their self-esteem. The degree to which the individual "comes out" is shown to affect life satisfaction as well. In contrast, the mediating effect of heterosexual support is shown to be insignificant. Based on the analyses, practical strategies regarding social stigma, social support, self-esteem, and "coming out" are suggested for sexual minorities. The social stigma should be reduced and society-scaled campaigns promoted in order to improve their level of life satisfaction. In addition, institutional protection should be developed and specialized educational courses on human rights provided which will empower these minorities with self-help mechanisms. Furthermore, issues such as establishing support system and providing a social welfare system for the sexual minority community are discussed.

• Korean Journal of Legislative Studies
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• v.25 no.3
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• pp.33-67
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• 2019

This study analyzes whether online political activities have an important impact on attitudes toward the legalization of same-sex marriage and the anti-discrimination law and whether these effects are different by the religion of voters. The main findings are as follows. First, the ideology variable has a significant effect on attitude toward legalizing same-sex marriage and enacting anti-discrimination law. Second, the higher the degree of online political activities, the more likely they will support two issues. Third, the effect on attitudes toward the enactment of anti-discrimination law has appeared different by religion. In other words, Protestants, compared to other religions, are more likely to oppose the enactment of anti-discrimination laws as the level of online political activities increased. Our study is meaningful in that we found online political activities play an important role in making voters' attitudes positively toward the enhancement of the right of sexual minorities. Also, although ideological conflicts are usually intense in diplomatic and security issues in Korea, the sexual minority issue would be likely to be an crucial as a dimension of ideological conflicts.

• Korean Journal of Culture and Social Issue
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• v.20 no.1
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• pp.1-18
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• 2014

In some studies regarding acculturation strategies developed Berry(1997), not the preference for integration, but the preference for assimilation showed the best adjustment, which is different from the results of the majority of studies. For the reason of these results, we supposed that when the people of the host society expect the minority members to be assimilated to the host society and the minority members have very similar culture to the host society, the preference for assimilation in the minority members would show the best adjustment. And we tested this hypothesis with Korean-Chinese who had very similar culture to Korean culture and Han-Chinese who had very different culture from Korean culture. For two hundred and twenty five students(63 Korean-Chinese and 162 Han-Chinese), we asked them to complete a questionnaire including Acculturation Strategies Scale, Psychological Well-being Scale, and Depression Inventory. Data from the survey were analysed using two-way ANOVA. As a result, the interaction effect of acculturation strategies and ethnic types affected both of psychological well-being and depression. In details, for Korean-Chinese students, the preference for assimilation showed the highest levels of psychological well-being and the lowest levels of depression, but the preference for integration showed the lowest levels of psychological well-being and the highest levels of depression. For Han-Chinese students, the preference for integration showed the highest levels of psychological well-being and the lowest levels of depression, and the preference for marginalization showed the lowest levels of psychological well-being and the highest levels of depression. We discussed the meanings of the results, implications, and interventions to help Chinese students adjust Korean society.

• Information Systems Review
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• v.24 no.4
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• pp.23-40
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• 2022

Although Support Vector Machine(SVM) has been used in various fields such as bankruptcy prediction model, the hyperplane learned by SVM in class imbalance problem can be severely skewed toward minority class and has a negative impact on performance because the area of majority class is expanded while the area of minority class is invaded. This study proposed optimized uneven margin SVM(OPT-UMSVM) combining threshold moving or post scaling method with UMSVM to cope with the limitation of the traditional even margin SVM(EMSVM) in class imbalance problem. OPT-UMSVM readjusted the skewed hyperplane to the majority class and had better generation ability than EMSVM improving the sensitivity of minority class and calculating the optimized performance. To validate OPT-UMSVM, 10-fold cross validations were performed on five sub-datasets with different imbalance ratio values. Empirical results showed two main findings. First, UMSVM had a weak effect on improving the performance of EMSVM in balanced datasets, but it greatly outperformed EMSVM in severely imbalanced datasets. Second, compared to EMSVM and conventional UMSVM, OPT-UMSVM had better performance in both balanced and imbalanced datasets and showed a significant difference performance especially in severely imbalanced datasets.

• Korean Journal of Child Studies
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• v.26 no.5
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• pp.31-38
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• 2005

This study investigated the performance of 346 students on the Reynold intellectual Assessment Scale scores for sex, ethnic, and socioeconomic differences. The sample consisted of 198 males and 148 females(271 White, 32 Black, 20 Hispanic, 8 Asian, and 15 others) who were referred for gifted evaluation. The findings indicated significant differences between the IQ scores with regard to sex, ethnicity, and socioeconomic status. Implications of these findings are discussed. in terms of assessing minority group members with the Reynolds Intellectual Assessment Scales (RIAS) to identify gifted children.

• Korean Journal of Materials Research
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• v.14 no.1
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• pp.9-12
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• 2004

Metallic impurities, such as Fe, Cu, and Au, become generation and recombination centers for minority carriers when combined with oxide precipitates or silicon self-interstitial clusters. As these centers may cause leakage and discharge in silicon devices, their prevention through gettering of the metallic impurities is an important issue. In this article, key aspects of intrinsic gettering, such as oxygen control, wafer cleaning, device area denudation, and bulk oxygen precipitation are discussed, and a practical method of implementing intrinsic gettering is outlined.

• Journal of the Korean Institute of Telematics and Electronics
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• v.19 no.5
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• pp.38-42
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• 1982

N+-P/P+solar cells were fabricated by using the polycrystalline silline wafer with the resistivity of 3-6 ohm-cm. minority carrier lifetimes, measured by Nd: YAG laser, were from 100ns up to 150ns. Conversion efficiency measured under AM 1 irradiation, were about 4%.

• 한국신재생에너지학회:학술대회논문집
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• 2008.05a
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• pp.431-431
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• 2008