• KSCE Journal of Civil and Environmental Engineering Research
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• v.29 no.6A
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• pp.625-639
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• 2009

Experimental and analytical studies are performed on the mechanical behavior of concrete-filled tubular(CFT) truss girders for different f/L ratios. Bending tests are conducted on two CFT truss girder specimens to determine fundamental structural characteristics such as the strength and deformation properties. Nonlinear material models for CFT members subjected to an axial compressive force are compared in this paper by using the nonlinear finite element program, ABAQUS. Previous researchers have proposed several nonlinear stress-strain models of confined concrete. In this study, the nonlinear analyses are performed applying several stress-strain models for confined concrete proposed by Mander, Sakino, Han, Susantha and Ellobody, and the results are compared with the experimental results in terms of load-deflection and load-strain relationships. Based on the comparisons of the load-deflection relationships, the models proposed by Mander and Susantha provide a maximum load about 12.0~13.8% higher and that by Sakino gives a maximum load about 7.6% higher than the experimental results. The models proposed by Han and Ellobody give a maximum load only about 0.2~1.2% higher than the test results, showing the best agreement among the proposed stress-strain models. However, the load-strain relations predicted by the existing models generally provide conservative results exhibiting larger strains than the experimental data.

• Journal of Veterinary Science
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• v.24 no.4
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• pp.51.1-51.17
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• 2023

Background: To date, various genotypes of infectious bronchitis virus (IBV) have co-circulated and in Korea, GI-15 and GI-19 lineages were prevailing. The spike protein, particularly S1 subunit, is responsible for receptor binding, contains hypervariable regions and is also responsible for the emerging of novel variants. Objective: This study aims to investigate the putative major amino acid substitutions for the variants in GI-19. Methods: The S1 sequence data of IBV isolated from 1986 to 2021 in Korea (n = 188) were analyzed. Sequence alignments were carried out using Multiple alignment using Fast Fourier Transform of Geneious prime. The phylogenetic tree was generated using MEGA-11 (ver. 11.0.10) and Bayesian analysis was performed by BEAST v1.10.4. Selective pressure was analyzed via online server Datamonkey. Highlights and visualization of putative critical amino acid were conducted by using PyMol software (version 2.3). Results: Most (93.5%) belonged to the GI-19 lineage in Korea, and the GI-19 lineage was further divided into seven subgroups: KM91-like (Clade A and B), K40/09-like, QX-like (I-IV). Positive selection was identified at nine and six residues in S1 for KM91-like and QX-like IBVs, respectively. In addition, several positive selection sites of S1-NTD were indicated to have mutations at common locations even when new clades were generated. They were all located on the lateral surface of the quaternary structure of the S1 subunits in close proximity to the receptor-binding motif (RBM), putative RBM motif and neutralizing antigenic sites in S1. Conclusions: Our results suggest RBM surrounding sites in the S1 subunit of IBV are highly susceptible to mutation by selective pressure during evolution.

• Journal of Korea Entertainment Industry Association
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• v.13 no.5
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• pp.155-165
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• 2019

The sense of happiness of early childhood teachers has a great influence not only on teaching but also on infants. The purpose of this research is to investigate how prospective pre-service teachers' sense of happiness influence their teacher professionalism and teacher efficacy. The subjects were 264 pre-service teachers' in Gwangju metropolitan city and Jeollanamdo province. Statistical analysis of this study was done by Pearson's correlation coefficient and multiple regression analysis using SPSS WIN 22.0 program. The results of this study were as follows. First, there were significant positive relationships among the sense of happiness on teacher professionalism and teacher efficacy. There was a significant positive correlation between external happiness, inner happiness, and self-regulated happiness, which are indicating that there is a meaningful correlation between pre-service teachers' sense of happiness, teacher professionalism and teacher efficacy. Second, the sense of happiness was an important factor for predicting the teacher professionalism and teacher efficacy of pre-service early childhood teachers. The results of this study show that the pre - service teacher 's sense of happiness is a predictor variable that positively affects teacher professionalism and teacher efficacy. In conclusion, It is meaningful in seeking ways to improve teacher education by enhancing the euphoria of prospective pre-service teachers during school life and strengthening positive aspects of the educational contents and processes of the institutions that train infant teachers.

• Journal of Korea Entertainment Industry Association
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• v.13 no.8
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• pp.189-198
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• 2019

This study aims to make meaning of the reactions of the Korean people through the text mining of comments on videos of the December 2018 MMA performance of intro on YouTube. For this, comments on 15 YouTube videos were collected over the past 10 months. With the collected data, a total of 5,135 comments were analyzed through crawling using the Python and BeautifulSoup programs, data was refined over a total of 3 sessions, and a final total of 5,080 comments were used as analysis material. A mining technique was used for data analysis and the process of refinement, analysis, and visualization was achieved using the Textom program. Research results showed that keyword analysis showed the keywords of 'performance', 'Korea', 'video', 'top', 'cool', 'dance', 'idol', 'legend', 'love', and 'gratitude' in that order and keywords such as 'patriotism' and 'Olympics' also appeared frequently. N-gram analysis showed that comments with contexts such as 'a top performance that will remain a legend among Korean idol performances', and 'an idol performance that displayed the traditional culture of Korea' were in higher ranks. Based on such keyword analysis results, topic modeling was applied and 5 top keywords were extracted from a total of 5 topics. Analysis results of topic contents and distribution showed that topics in the comments of this performance's videos largely consisted of the 3 reactions of 'high praise regarding the stage performance', 'affection towards the fusion and artistic sublimation of Korean traditional dance', and 'gratitude towards the uploading of cool dance videos'

• 한국노년학
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• v.32 no.2
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• pp.649-668
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• 2012

The purpose of this study ahead of the aging society in Korea to prevent problems of the elderly aged new addiction Internet Addiction and identify factors affecting the quantitative increase and qualitative improvement beyond that aims to promote. To this end, residents in Seoul over the age of 60's targets, local welfare, cultural centers, senior centers and other research in the area through one-on-one interviews were conducted the survey. Findings The average degree of Internet addiction elderly 36.16 points (SD = 10.02) and the distribution of at least 20 points to 65 points, respectively. Factors affecting the degree of Internet addiction as a computer time (β = .248, p <.001), mon allowance (β = .180, p <.01), age (β = .139, p <.01) and social support (β = .087, p <.05), self-efficacy (β = - .078, p <.05), most used location (β = - .116, p <.05), degree of family relationship (β = - .147, p <.01), housing type (β = - .153, p <.01), were of the order, this factor was 17.6% of the variance. In other words, the more computer time, the higher the age, the more mon allowance, housing is not self, the lower the degree of family relationship, the house is not a place most used, lower self-efficacy, social support is high As increasing the degree of Internet addiction was thought to be the two predictor variables. Survey results to target the elderly through the Internet addiction group psychotherapy program implementation, and production and distribution of manuals related to Internet use and addiction-related factors, according to the case-by-case Case management services are tailored to be done, and the Internet in general for seniors potential risks related to use in training and preventive services for the elderly will need to be made.

• 한국노년학
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• v.30 no.4
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• pp.1409-1427
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• 2010

The purpose of this study is to understand volunteer work experiences of senior citizen volunteers serving in the welfare center in K district in the aspect of an insider and to apprehend the meaning. The objects of this study are fifteen senior citizen volunteers and two social workers who do volunteer works in the welfare center, and this study utilized the qualitative study method through observations and in-depth interviews from 2009.09.02 to 2009.10.21. The data analysis is processed by the qualitative analysis program, Nvivo 2.0, and the processed data are analyzed in accordance with the grounded theories of Strauss and Corbin. As a result of reviewing data, the meanings about volunteer work experiences of senior citizens are induced as eight factors; senior citizens' identity in an old aging society, desire fulfillment through volunteer works by senior citizens, various leisure activities to help their health in mind and body, acceptance attitude about aging, mental supports from their families, finding activities suitable for each person's personality and capability, changes of perception about the handicapped, and endeavors to spend meaningful old age. Through results and discussion obtained by this study, the conclusion is as below: First, participation induction factors are identities of elderly people in aging society, acceptance attitudes toward aging and emotional support from families in the matter of senior citizens' volunteer work. Second, programs suitable for individual aptitude and capability should be implemented for activating senior citizens' volunteer work. Third, participation in senior citizens' volunteer work indicates desire satisfaction through senior citizens' volunteer work, leisure activities helping health for body and mind, and life changes such as changes of perception about handicapped people etc.

• 한국노년학
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• v.29 no.1
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• pp.71-87
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• 2009

The purpose of this study were to identify factors of successful aging and to suggest a successful aging model of elderly using Rowe & Kahn's model of successful aging. The components of the factors consisted of healthful status, physical·cognitive functions, psychosocial characteristics and productive activities. Data were collected from 2,958 elderly who has spouse and aged 65 above in KOSA Panel. Data were analyzed by Amos program 7.0 version. The statistical techniques were used descriptive statistics χ² and covariance structural analysis. Major findings of this study were as follows; Healthful status were positively related to increasing effort on physical·cognitive functions as well as psychosocial characteristics. Physical·cognitive functions were positively and directly related to psychosocial characteristics and productive activities. Psychosocial characteristics were positively and directly related to productive activities. Physical·cognitive functions and psychosocial characteristics were increased by receiving a direct and positive effort from healthful status. Productive activities were increased by receiving a direct and positive effort from physical·cognitive functions and psychosocial characteristics. Specific and realistic measures should be prepared for successful aging not only for present elderly but also for the future elderly people. Further research should be continued and encouraged to improve the implications for the successful aging especially in korea.

• 한국노년학
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• v.29 no.4
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• pp.1645-1663
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• 2009

The purpose of the study is to analyze the mediating effects of self-image on the relationship between experience of discrimination and self-esteem among the elderly in Korea. Furthermore, it is to explore whether these effects are moderated by social and economic activity participation. Data were collected from a cross-sectional survey of 543 community-dwelling Korean older adults (age≥65) drawn from community and senior centers in the mid-size city in Korea. The statistical analysis was performed by a structural equation modeling using LISREL statistical program. The results are fourfold. First, experiences of discrimination exerted the negative effects on physical, dispositional, and competent self-images of the elderly. Second, dispositional and competent self-image brought down by discriminative experiences lowered the levels of self-esteem. Third, social activity participation moderated the negative effects of discrimination experiences on physical and dispositional self-images. It also moderated the effects of dispositional self-image on self-esteem. Fourth, economic activity participation did not show moderating effects on the relationship between experience of discrimination and self-images. Meanwhile, it moderated the effect of competent self-image on self-esteem. These results demonstrate that to improve self-esteem of the elderly population, social welfare policies should make effort to reduce discrimination toward the elderly. Furthermore, social welfare organizations should also try to implement diverse community based programs geared for enhancing social and economic activities for elderly. Limitations and directions for future research are also discussed.

• 한국노년학
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• v.31 no.4
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• pp.1209-1228
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• 2011

The study is set out to examine the degree of on the life satisfaction and policy effects of the job creation project for the participating elderly The Subject of the study were 950 elderly people patrici parted In the job·creation project for the elderly in the aged welfare agency in the Seoul. For data analysis, SPSS15.0 for window program was utilized. The primary findings from the research can be summarized as follows. It was found that as for the participating reasons for the creation project most have responded to coding the living expenses; followed by the a sense of fulfillment by work, maintain health, not wanting to burden their children, society participating. After examining the difference in the personal effects felt by the elderly after participating in the job creation project by participation type, it revealed that the elderly who has participated in the job creation project has responded to the improved mental health, followed by the mental steadily and the alleviation of Ioneliness, in the order given for the personal effects. but the analysis on the social effects of the job creation project for the elderly by the participation type showed that the most elderly participating in the thought the promotion of social participating as the social effects of the job crenation project. The analysis on the degree of on the life satisfaction for the job creation project were effects policy. It is safe to say in order to raise the degree of satisfaction and vitalize the job creation project for the elderly, more realistic job creation project which reflects the characteristics of each type and various demands of the elderly would be essential.

• 한국노년학
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• v.31 no.3
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• pp.607-621
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• 2011

Purpose The purpose of this study was to examine the relationship between physical activities, sleep disturbance, and health related quality of life (HRQOL) in patients with chronic obstructive pulmonary disease (COPD). Methods A descriptive survey design used pretest dataset of COPD symptom management intervention study (N=245). Measures included the international physical activity questionnaire, the COPD and asthma sleep impact scale, and the St. George's respiratory questionnaire of HRQOL. The data were analyzed using descriptive analysis, t-test, ANOVA, Pearson correlation coefficients, and simultaneous multiple regression by the SPSS WIN 18.0 program. Results The mean scores (SD) of HRQOL and sleep disturbance were 36.04 (19.43) and 14.33 (6.20), respectively. About 32% of participants were physically inactive. The multivariate approach showed the patients who have more sleep disturbance (β=.27), lower levels of FEV1 % predicted (β=-.23), lower physical activities (β=-.19), lower household income (β=-.16), and diagnosed longer than 5 years (β=.14) reported lower HRQOL (R²=.34). Conclusion The findings of this study suggest that improving the quality of sleep and physical activities can be efficient strategies for HRQOL in patients with COPD. Future research in enhancing HRQOL through improving sleep quality and physical activities is needed.