• Journal of ILASS-Korea
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• v.6 no.1
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• pp.35-43
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• 2001

Previous studies on image processing techniques for panicle size measurement usually have focused on a single panicle or weakly overlapped particles. In the present work, the image processing algorithm for particle size measurement has been improved to process heavily-overlapped spherical-particle images. The algorithm consists of two steps; detection of boundaries which separate the images of the overlapped panicles from the background and the panicle identification process. For the first step, Sobel operator (using gray-level gradient) and the thinning process was adopted, and compared with the gray-level thresholding method that has been widely adopted. In the second, Hough transform was used. Hough transform is the detection algorithm of parametric curves such as straight lines or circles which can be described by several parameters. To reduce the measurement error, the process of finding the true center was added. The improved algorithm was tested by processing an image frame which contains heavily overlapped spherical panicles. The results showed that both the performances of detecting the overlapped images and separating the panicle from them were improved.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2011.05a
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• pp.73-76
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• 2011

본 논문에서는 세라믹 비파괴 검사를 이용하여 획득한 소재 영상에서 기존의 결함 검출 방법보다 결함 검출의 정확도를 개선하기 위한 개선된 결함 검출 방법을 제안한다. 제안된 결함 검출 방법은 명암 대비를 강조하기 위해 최소 명암도와 최대 명암도를 이용한 Ends-in Search Stretching 기법을 적용하여 비파괴 영상의 명암 대비를 강조한다. Stretching 기법이 적용된 영상에 $7{\times}7$ Sobel 마스크를 적용하여 비파괴 영상의 경계 영역을 추출하고, 영상의 잡음을 제거하기 위해 비등방성 필터링을 적용하여 영상을 보정한다. 보정된 영상에서 임계치 이진화 기법을 적용하여 경계 영역의 기울기를 계산하고, 계산된 기울기를 이용하여 비파괴 영상의 영역을 세분화한다. 세분화된 영역을 구분하기 위해 Grassfire Labeling 기법을 적용한다. Grassfire Labeling 기법이 적용된 영상을 Ends-in Search Stretching 기법이 적용된 비파괴 영상에 적용한 후에 대각선 이진화 기법을 적용한다. 이진화된 영상에서 형태학적 정보를 이용하여 잡음을 제거하고 결함을 검출한다. 본 논문에서 제안한 방법을 획득한 세라믹 소재 영상을 대상으로 실험한 결과, 기존의 결함 검출 방법보다 더 효과적으로 소재의 결함을 추출할 수 있는 것을 확인할 수 있었다.

• Human Ecology Research
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• v.52 no.6
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• pp.651-668
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• 2014

The main purpose of this study was to examine the relationship between social support, life satisfaction, and school-related adjustments of adolescents. The participants were 260 junior high school students (140 male and 120 female students) from the Seoul area. They completed questionnaires on social support, life satisfaction, and school-related adjustments. The collected data were analyzed using basic descriptive statistics, Pearson's correlation, and a multiple regression analysis. Baron and Kenny's method was used and examined, and the Sobel test was performed to determine the mediating model's significance. It was adapted to SPSS ver. 19.0 for Windows. The major findings were as follows: first, social support (parents/teacher/friend) was positively correlated with the adolescents' school-related adjustment. Second, the adolescents' life satisfaction was also positively correlated with the adolescents' school-related adjustments. In addition, social support was positively correlated with life satisfaction. It was further found that the adolescents' life satisfaction tended to play a perfectly/partially mediating role between social support and school-related adjustment; that is, social support (parents/teacher/friend) was shown to have not only a direct effect, but also an indirect effect through the adolescents' life satisfaction, on the school-related adjustments. These results clearly indicated that adolescents' life satisfaction plays a crucial role in the relationship between social support and the adolescents' school-related adjustments.

• Human Ecology Research
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• v.58 no.3
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• pp.299-313
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• 2020

This study investigated the relationship among fathers' parenting involvement, mothers' parenting competence, and young children's self-control. Participants consisted of 325 mothers and young children (169 boys and 153 girls) from the Seoul area who completed questionnaires on fathers' parenting involvement, mothers' parenting competence, and young children's self-control. Data were statistically analyzed using basic descriptive statistics, Pearson's correlation, and multiple regression analysis. Baron and Kenny's method was examined. Subsequently, the Sobel test was performed to check the mediating model's significance and was adapted to SPSS version 21.0 for Windows. The major findings were as follows. First, fathers' parenting involvement was positively correlated with young children's self-control and mothers' parenting competence. Second, mothers' parenting competence was positively correlated with young children's self-control. The mothers' parenting competence indicated a tendency to play a perfectly/partially play a mediating role between fathers' parenting involvement and young children's self-control; consequently, a fathers' parenting involvement had a direct effect as well as an indirect effect through the mothers' parenting competence on young children's self-control. The results indicated that a mothers' parenting competence plays a crucial role in the relationship between a fathers' parenting involvement and the young children's self-control.

• Journal of Fisheries and Marine Sciences Education
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• v.24 no.2
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• pp.333-345
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• 2012

NOAA/AVHRR, Topex/Poseidon, and Jason-1 data were used to analyze sea surface temperatures and thermal fronts in the North East Asia Seas. Temporal and spatial analyses were based on data from 1993 to 2008. The amplitude and phase for the annual mode on SL and SST were investigated with harmonic analysis. The geographical distribution of amplitudes for comparison of SL and SST are slightly reverse in southwest-northeast tilted direction. The time series analysis conducted on the entire researched area presented consistent pattern. Peak of Sea Level was presented 1~2 months after the peak of the surface sea temperature was shown. This explains that Sea Level change occurs after the generation of surface sea temperature change in sea. The Sobel edge detection method delineated four fronts. Thermal fronts generally occurred over steep bathymetric slopes. Annual amplitudes and phases were bounded within these frontal areas.

• Journal of Korean Public Health Nursing
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• v.31 no.3
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• pp.518-527
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• 2017

Purpose: This study examined the relationship among stressful life events, mindfulness and depression, and explored the mediating role of mindfulness between stressful life events and depression in nursing students. Methods: A cross-sectional survey was undertaken. A sample of 120 nursing students participated in the study. The self-reported measures of stressful life events (revised life stress scale), depression (DASS-D) and mindfulness (MAAS) were adopted in April, 2017. The data were analyzed using descriptive statistics, frequency, Pearson correlation coefficient and multiple regression. Mediation analysis was performed using the Baron & Kenny method and Sobel test. Results: The mean scores of stressful life events, mindfulness and depression were 39.50, 77.03, and 8.18, respectively. Higher levels of stressful life events were associated with lower mindfulness (r = -46, p < .001) and higher depression (r = -44, p < .001), and mindfulness was negatively associated with depression (r = -72, p < .001). Mindfulness showed full mediation in the relationship between stressful life events and depression. Conclusion: Stressful life events influenced the nursing students' depression via the full mediating effect of mindfulness. Promoting mindfulness plays an important role in reducing depression in nursing students. Therefore, it is important to develop a mindfulness program or use a mindfulness-based stress reduction program (MBSR) for nursing students.

• Journal of Korean Public Health Nursing
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• v.31 no.3
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• pp.528-539
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• 2017

Purpose: This study examined the mediating effects of gratitude on the relationship between life stress and depression in nursing students. Methods: The participants were 181 nursing students recruited from 2 universities in B and D cities in South Korea. Baron and Kenny's regression method and the Sobel test were employed to analyze the mediating effects of gratitude on the association between life stress and depression, via the SPSS/WIN 18.0 program. Results: The participants' mean depression score was 9.58, and there were significant differences in depression according to perceived interpersonal relationships and perceived physical health statue. In addition, gratitude exerted partial mediating effects on the relationship between life stress and depression. Conclusion: This study indicated gratitude as factors managing depression in nursing students. Based on the results of this study, strategies to increase nursing students' gratitude are highly recommended for management of their depression.

• Korean Journal of Adult Nursing
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• v.28 no.4
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• pp.482-490
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• 2016

Purpose: The purpose of the study was to examine the impact of self-efficacy in the prevention of sexually transmitted diseases (STD), knowledge of and susceptibility to STD, and the role of gender in sexual autonomy. Methods: Data were collected from 267 college students using self-report questionnaires during the period from the first to the twentieth of June 2015. Data were analyzed using $x^2$ test, Fisher's exact test, t-test, Pearson correlation coefficients, simple and multiple regression techniques with the PASW/WIN 20.0 program. Mediation analysis was performed according to the Baron and Kenny method and Sobel test. Results: In male students, self-efficacy for STD prevention showed a full mediating effect in the relationship between STD susceptibility and sexual autonomy (${\beta}$=-.08, p=.370). But in female students, it had a partial mediating effect (${\beta}$=-.25, p=.001). And self-efficacy for STD prevention showed partial mediating effects in the relationship between knowledge of STD and sexual autonomy in the both male (${\beta}$=.25, p=.005) and female students (${\beta}$=.33, p<.001). Conclusion: To enhance college students' sexual autonomy, it may be useful to build effective strategies enhancing students' knowledge about and susceptibility to STD and to develop a self-efficacy promotion program for college students.

• The Journal of Asian Finance, Economics and Business
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• v.7 no.9
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• pp.427-438
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• 2020

This study aims to analyze and confirm brand awareness' role in influencing the repurchase intention both directly and indirectly on customer satisfaction variables and repurchase intention variables. The contribution brought by this study is to reflect manifest variables such as recall, purchase, and consumption. The number of respondents in this study was 200 samples using the online survey data collection method (Google form), while the research approach is quantitative explanatory. The data analysis test tools include the Structural Equation Modeling (SEM) approach with AMOS as a statistical data analysis software and Sobel test to indirectly test the relationship. This study consists of four hypotheses, of which three hypotheses are positively and significantly related (brand awareness on repurchase intention, brand awareness on customer satisfaction, and customer satisfaction on repurchase intention). Through indirect relationship, namely, brand awareness on repurchase intention through customer satisfaction, the study showed no significant effect. In a comprehensive way, this study emphasizes the factor of customer satisfaction as a determinant of consumer loyalty and repurchase intention. Therefore, creating optimal customer satisfaction, service excellence, promotion and massive advertising, guaranteeing the safety and ease-of-use apps, and ease of shopping, especially for e-commerce industry, is a serious concern.

• The Journal of Asian Finance, Economics and Business
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• v.7 no.7
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• pp.199-208
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• 2020

This study investigates the direct and indirect effects, mediated by audit committee quality, of managerial ownership, institutional ownership, and profitability on intellectual capital (IC) disclosure. The object observed of this study is companies listed on the Indonesia Stock Exchange (IDX) in the 2014-2018 period that are classified as high intellectual capital-intensive industries. Based on the sampling method, purposive sampling, 51 companies were selected as samples. This study used path analysis techniques with IBM SPSS version 25 to study the direct and indirect influences of managerial ownership, institutional ownership, and profitability toward IC disclosure. The results of this study show that managerial ownership, profitability and audit committee quality have a significant positive effect on IC disclosure whereas institutional ownership has significant negative effect on IC disclosure. This study also provides empirical evidence, supported by the sobel test, that the audit committee quality is able to mediate the effect of institutional ownership and profitability on IC disclosure. However, the audit committee quality is not able to mediate the effect of managerial ownership on IC disclosure. These findings develop and strengthen the results of prior studies related to the implementation of signaling theory and agency theory in devoting more understanding about IC disclosure.