• Proceedings of The KACE
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• 2018.01a
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• pp.41-44
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• 2018

교육데이터마이닝은 다양한 교육 환경에서 생성되는 막대한 양의 데이터를 활용하여 학습자들의 학습 유형, 학습 진도를 분석, 예측하고 교육 성취를 효과적으로 향상시키는 것을 목적으로 한다. 효과적인 교육데이터마이닝 결과를 얻기 위해서는 교육데이터에 대한 정제 과정이 필요하며 DBSCAN 클러스터링을 통해 교육데이터에 포함된 노이즈 데이터를 제거하고 생성된 각 클러스터에서 동일한 비율로 데이터를 추출함으로써 편향되지 않은 표본 데이터를 생성할 수 있다. 하지만 DBSCAN은 두 개의 전역 매개변수에 의해 다양한 밀도분포를 가지는 클러스터를 생성할 수 없다는 문제점이 있으며 이는 교육 데이터를 정제함에 있어 치명적인 문제점이 될 수 있다. 본 논문에서는 DBSCAN의 문제점을 개선하고 클러스터링 정확도를 향상시키기 위해 고정된 매개변수를 사용하지 않고 각 밀도분포에 대해 최적의 입력 매개변수를 결정함으로써 다양한 밀도분포를 가지는 클러스터들을 효과적으로 생성하는 C-DBSCAN을 제안한다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.20 no.11
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• pp.27-32
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• 2019

This study examined the mediated effects of job satisfaction and the control effects of the perceived organizational support awareness on the effects of safety awareness recognized by construction workers on unsafe acts as a way to reduce unsafe acts. To this end, 439 workers at 23 construction sites across the country received a questionnaire from July 1 to July 20, 2019 and the data were analyzed, which resulted in the following conclusions. First, the sense of safety in which construction workers are late has a direct influence on job satisfaction. Second, job satisfaction recognized by construction workers has been shown to have a direct negative effect on the anxiety act. Third, job satisfaction was influenced by the medium in relation to safety awareness and anxiety transfer act recognized by construction workers. Fourth, the adjustment effect of the perceived organizational support awareness in the relationship between safety awareness and task satisfaction was shown to be significant. This study suggests that to prevent unsafe acts at construction sites, increased safe acts reduce the level of anxiety transfer due to a high sense of safety and job satisfaction by workers.

• The Journal of Society for e-Business Studies
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• v.25 no.1
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• pp.65-82
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• 2020

Start-ups often use crowdfunding platforms such as Wadiz to get financing from corporate investors and general public. These platforms include functions to increase participant activity through the number of comments, interest and online word-of-mouth. This study aims to elucidate how these functions related to a participant activity exhibit mediating effects on a success of crowdfunding and an achievement rate of targeted investment amount. To this end, the individual variables such as progress period, target amount, venture company, experience of attracting investment, possession of intellectual property rights, a career of the representative and an award experience of the representative were classified into the project characteristics, the company characteristics and the representative characteristics through not only previous studies but also interviews with investment professionals and platform operators. Afterwards, this study went through an empirical verification process using a structural equation model that has both crowdfunding performance and participant activity, which is the independent and mediating factors of three perspectives, as well as the dependent variables. In other words, this study analyzes how the characteristics of three perspectives affect the participant activity and how the participant activity had the mediating effects on the crowdfunding performance. In addition, it derives how the analysis results mentioned above vary according to business types (internet services, culture/art, manufacturing/distribution) and investment styles (stock type and bond type). It is expected that this study will help not only in deriving the factors affecting the performance of an investment type crowdfunding but also in preparing the measures to increase a participant activity.

• Journal of vocational education research
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• v.35 no.6
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• pp.1-19
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• 2016

This study is to analyze the effect of job relatedness of content in learning, job stress and organization communication on turnover intention and to examine whether the job satisfaction has a mediating effect by using HCCP 2013 panel data. The data was analyzed through Windows SPSS 23.0 program. Major findings of the study were as follows. First, It has significant result that job relatedness of content in learning, job stress and organization communication affects turnover intention. Second, job satisfaction mediates between job relatedness of content in learning and turnover intention. The job relatedness of content in learning level is higher, the turnover intention will be lower through mediating job satisfaction. Third, job satisfaction is also significant effect between job stress and turnover intention. Although the job stress gets higher, the turnover intention can be lower because of job satisfaction. Finally, the relationship between organization communication and turnover intention is mediated by job satisfaction. Therefore, the company should prepare employee's turnover intention to control through this study.

• The Journal of the Korea Contents Association
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• v.19 no.3
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• pp.100-113
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• 2019

The purpose of this study was to confirm the characteristics of released prisoners through demographic and sociological variables and to investigate the effects of childhood traumatic experiences on family functioning and the mediating effects of anger expression method. For this purpose, Korea Rehabilitation Agency were selected and finally 400 released prisoners were analyzed. As a result, it appeared that anger expression method played a role of mediating variable when childhood trauma experience affects family functioning. Childhood trauma experience not only directly affects family functioning, but indirectly affects family functioning through anger expression method and the anger expression method played a role as partial mediating variable. Based on the results of this study, we emphasized the need for intervention and education for anger expression method in psychological counseling interventions to improve family functioning as a way to suppress the second offense of released prisoners with childhood abuse experience.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.20 no.9
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• pp.111-120
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• 2019

This study examined the mediating effects of perceived organizational support (POS) on the relationship between the person-job fit and job satisfaction of service workers. POS is divided into socioemotional POS and instrumental POS. To achieve the research purpose, a questionnaire survey was conducted on workers in charge of service jobs in domestic companies through an on-line survey system and finally, the results of 281 respondents were analyzed to verify the hypothesized research model with an 80.3% effective recovery rate. The findings are as follows. First, the person-job fit has positive effects on job satisfaction and POS. Second, among the sub-constructs of POS, socioemotional support has mediating effects, but instrumental support has no mediating effects on the relationship between person-job fit and job satisfaction. Based on the results of this study, this study suggests theoretical and practical implications for the human resource development and management of service workers. Overall, changes in the recruitment system, which can judge the person-job fit of employees who perform emotional labor facing customers, organizational culture and personnel system for establishing socioemotional support system, and compensation and workforce development system, are needed to enhance the job satisfaction of service workers.

• The Journal of the Korea Contents Association
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• v.22 no.5
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• pp.527-541
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• 2022

This study analyzed the structural relationship between motivation to participate in online lifelong education through YouTube, academic self-efficacy, and learning flow, where learners are rapidly increasing due to the spread of COVID-19. For this study, an online survey was conducted from July 16 to 30, 2021 for adult learners living in the metropolitan area. A total of 428 people participated in the survey, and a total of 409 copies of the results were analyzed, excluding 19 insincere responses. The main analysis results are as follows. First, The fitness of the research model was verified to be suitable for all analysis. Second, as a result of confirming the coefficients and statistical significance of each pathway in the research model, the motivation to participate in YouTube lifelong education was learning flow and academic self-efficacy, and academic self-efficacy also had a positive effect on learning flow. Third, it was confirmed that the effect of participation motivation in YouTube lifelong education on learning flow through academic self-efficacy was a statistically significant partial mediation. This study is meaningful in that it verified the structural relationship analysis between participation motive, academic self-efficacy, and learning flow in online lifelong education using YouTube reflecting the digital transformation of lifelong education due to COVID-19. Reflecting the need for re-regulation of lifelong education formed after COVID-19 and the flow of digital transformation through the research results, we discussed how lifelong education can enhance learners' motivation to participate and strengthen learning flow through academic self-efficacy as a medium.

• Proceedings of the Korean Society of Computer Information Conference
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• 2019.07a
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• pp.247-248
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• 2019

본 논문에서는 블루투스 비콘을 이용해 고소 작업장 등의 위험지역에서 작업자 추적 및 확인과 안전 벨트고리를 체결했는지 여부와 작업자의 행동에 따른 데이터를 추가로 수집하여 작업자의 행동 패턴을 분석하였다. IoT 국제 표준인 oneM2M을 기반으로 IoT Device와 Application을 연결하는 중간 매개체로 모비우스 플랫폼을 사용해 시스템을 구축하였다. 또한, 본 연구팀의 선행 연구에서 작업자 위험 행동분류 시스템을 개선할 수 있는 연구 결과를 비교하였다.

• Korean Journal of Social Welfare
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• v.69 no.1
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• pp.223-254
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• 2017

This study was carried out to examine whether the moderated mediating effect of SNS addiction resulting from marital dissatisfaction and loneliness is influenced by gender or size and composition of social capital. 714 married men and women in their 20's to 40's were participated in this study. The data were collected by online research center with quota sampling based on demographical proportion. To analyze this research model, the moderated mediating effect utilizing structural equation was used. The results of this study were summarized as follows. First, it is verified that the loneliness moderated between marital dissatisfaction and SNS addiction. Since the relationship between independent and dependent variable is insignificant, comparison of competition model was able to determine if mediating effect was fully or partially shown. As a result, the complete mediated model was ultimately chosen because its various goodness-of-fit index including $x^2$ performed fairly well. Second, the mediating effect which moderates social capital size was presented in the mediated model between the marital dissatisfaction, loneliness and SNS addiction. Specifically, It implies that group who recognizes their social capital big recognizes the route and effect size more than that who considers their social capital small. And the moderated mediating effect depending on different type of social capital among the marital dissatisfaction and loneliness and between SNS addiction was substantiated. It implies that disequilibration of SNS social capital in face-to-face sphere and in online acted as a danger fact with respect to the marital dissatisfaction, loneliness and SNS addiction. The implications of these findings were discussed, and directions for future studies were also proposed.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.17 no.4
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• pp.138-146
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• 2016

This study examined the mediating effects of the adult educator's characteristics on the relationship between the characteristics of the participants attending adult continuing education and the happiness index of lifelong learning, the motivation of participating in learning and the institution characteristics. The research results showed that there is no difference in the happiness index of lifelong learning according to the sex of the adult learners, education level, age, residence, participation experience of lifelong learning, occupation, and type of lifelong programming being participated. The characteristics of adult learners do not have a direct impact on the happiness index of lifelong learning. The characteristics of adult learners affect the characteristics of adult educators, motivation of participating in learning and institution characteristics. Although the characteristics of educators do not affect the happiness index of lifelong learning, the motivation of participating in learning and institution characteristics have a positive impact on the happiness index of lifelong learning. While the characteristics of adult educators do not have a mediating role for the characteristics of adult learners and happiness index of lifelong learning, the motivation of participating in learning and institution characteristics have shown a complete mediation for the characteristics of adult learners and the happiness index of lifelong learning. These findings suggest that the participating motivation of adult learners, adult educator's improved understanding on adult learners and education quality of education institution are very important for increasing the happiness index through a lifelong learning experience.