• 응용통계연구
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• 제5권2호
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• pp.211-227
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• 1992

본논문은 지금까지 집락분석방법에서 많이 사용되는 유사도 또는 비유사도의 정의 및 이들의 수학적 성질을 알아보고, 또한 이들에 의해서 생성되는 비유사도 행렬을 이용하여 계층적 집락분석을 실시하였다. 이 경우에 가정된 초기의 집락 구조를 정확하게 잘 재생시킬 수 있는 비유사도의 측정방법과 계층적 응집법의 상호 관계를 질적자료와 양적자료 각각에 대하여 고찰하고, 이들에 관련된 시뮬레이션 결과를 제시하였다.

• 대한원격탐사학회지
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• 제19권2호
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• pp.135-147
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• 2003

본 연구는 한반도 위성 영상자료에 다단계 계층군집 영상분류법을 적용하여 관측지역의 피복특성을 분석한다. 다단계 계층군집 영상분류는 크게 두 단계로 이루어진다. 첫 번째 단계는 계층군집에 의해 공간적으로 근접하고 있는 이웃집단간의 결합을 하는 공간확장 영상분할 단계이고 두번째 단계는 결합지역의 공간적 제약 없이 영상분할 단계에서 분할된 집단을 계층군집에 의해 적은 한정적인 수의 클래스로 분류하는 과정이다. 계층군집 영상분류는 수치영상의 계층구조에 근거하여 매 단계 두 개의 집단을 한 개의 집단으로 합병하므로 클래스 수에 따른 분류집단 간의 관계를 나타내는 계층나무를 구성할 수 있다. 실험결과는 계층군집 영상분류에 의해 구성된 계층나무는 토지사용간의 계층구조를 자세히 밝혀주고 토지 피복 특성의 정확한 분석에는 좀 더 자세한 분광정보가 필요함을 보여주고 있다.

• 한국지능시스템학회:학술대회논문집
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• 한국퍼지및지능시스템학회 1993년도 Fifth International Fuzzy Systems Association World Congress 93
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• pp.1317-1320
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• 1993

We are concerned with developing a robust method for comprehensive scene analysis. In particular, we address the problem of representing spatial relations between regions in a segmented 2D image. Spatial relations are modeled as fuzzy sets. The method has two aspects, symbolic and quantitative, consisting of assigning labels for spatial relations and numeric degrees to which a relation holds respectively. The procedure of deriving a spatial relation is hierarchical taking into account geometric/physical characteristics of the regions in question.

• 천문학회보
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• 제40권1호
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• pp.76.1-76.1
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• 2015

We study the environmental dependence of the mass-size relation especially for the most massive early type galaxies (M>$10^{11.2}M_{\odot}$) in the redshift range 0.15~0.25. As a measure of the environment, galaxy number densities are measured by the $10^{th}$ nearest galaxies within 7000km/s from galaxies with spectroscopic redshifts. We find that galaxies more massive than $10^{11.6}M_{\odot}$ show the environmental dependence in the mass-size relation. The galaxies with M>$10^{11.6}M_{\odot}$ located in the densest, cluster like environment have larger sizes than their counterparts located in a low dense environment. We also find that this environmental dependence of the mass-size relation originates from the brightest cluster galaxies (BCG) rather than non-BCG galaxies. Our result can be explained with a hierarchical growth of the most massive galaxies through dissipation-less merger in dense environments.

• 천문학회보
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• 제40권2호
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• pp.29.1-29.1
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• 2015

We study the environmental dependence of the mass-size relation for the most massive early type galaxies (M > $10^{10.7}M_{\odot}$) in the redshift range 0.10~0.15. As a measure of the environment, galaxy number densities are measured by the $10^{th}$ nearest galaxies within 6500km/s from galaxies with spectroscopic redshifts. The sizes of galaxies are measured by non-parametric method. We find that galaxies more massive than $10^{11.1}M_{\odot}$ show the environmental dependence in the mass-size relation. The galaxies with M > $10^{11.1}M_{\odot}$ located in the densest, cluster like environment have larger sizes and extended surface brightness profiles than their counterparts located in a low dense environment. We also find that the environmental dependence of the mass-size relation is more significant for the brightest cluster galaxies (BCGs) than non-BCGs. Our result can be explained with a hierarchical growth of the most massive galaxies through dissipation-less merger in dense environment.

• 천문학회보
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• 제41권1호
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• pp.69.2-69.2
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• 2016

We study the environmental dependence of the mass-size relation for the most massive early type galaxies (M>$10^{10.7}M_{\odot}$) in the redshift range 0.10~0.15. The sizes of galaxies are measured by non-parametric method. We find that galaxies more massive than $10^{11.1}M_{\odot}$ show the environmental dependence in the mass-size relation. The galaxies with M>$10^{11.1}M_{\odot}$ located in the densest, cluster like environment have larger sizes and extended surface brightness profiles than their counterparts located in a low dense environment. We also find that the environmental dependence of the mass-size relation is more significant for the brightest cluster galaxies (BCGs) than non-BCGs. We use the semi analytic galaxy formation simulation based on the Millennium 1 Simulation for interpretation. Our result can be explained with a hierarchical growth of the most massive galaxies through dissipation-less merger in dense environment.

• 근관절건강학회지
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• 제26권3호
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• pp.195-204
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• 2019

Purpose: This study was conducted to identify the relationships between role conflict, nursing organizational culture, resilience and nursing performance and the factors influencing nursing performance in clinical nurses. Methods: The participants were 191 nurses working for more than 6 months in a National University Hospital. Data were collected through self-report questionnaires from October to November in 2016. Collected data were analyzed using descriptive statistics, t-test, ANOVA, Pearson correlation coefficients, and hierarchical multiple linear regression with SPSS/WIN 24.0. Results: Factors affecting nursing performance in clinical nurses were resilience (β=.41, p<.001), relation-oriented nursing organizational culture (β=.12, p=.007) and hierarchical-oriented nursing organizational culture (β=.13, p=.047). These factors explained about 37.7% of the variability in nursing performance (F=10.57, p<.001). Conclusion: It is necessary to estabilish a relation-oriented nursing organizational culture in nursing organization. Also, education and intervention programs to improve nurses' resilience should be developed in order to increase nursing performance in clinical nurses.

• Human Ecology Research
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• 제52권3호
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• pp.313-324
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• 2014

This study investigated the effects of acculturative stress and resilience on the depression of university students from North Korea, and examined the moderating effect of resilience on the relation between acculturative stress and depression. The participants of this study were 116 university students from North Korea (53 males and 63 females) aged between 20 and 35 years. The participants were asked to respond either to a written questionnaire or to an online survey system designed to measure research variables. The data were analyzed by using descriptive statistics and a hierarchical regression. The moderating effect of resilience was examined by means of a hierarchical regression. The major findings were as follows: first, an increase in the level of acculturative stress increased that of depression, whereas an increase in the level of resilience decreased that of depression. Second, the moderating effect of resilience on the relation between acculturative stress and depression was statistically significant. That is, the negative influence of acculturative stress on depression was greater when the level of resilience was low, compared to when it was high. In summary, both acculturative stress and resilience had significant effects on the depression of university students from North Korea. Moreover, resilience buffered the detrimental effect of acculturative stress on their depression.

• 대한가정학회지
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• 제50권5호
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• pp.13-24
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• 2012

This study examined the effects of mothers' reactions toward children's negative emotion as well as mothers' emotional expressivity on children's social withdrawal. 206 children (103 boys, 103 girls; aged 4-5 years old) and their mothers participated in the study. Mothers reported their reactions to their child's negative emotion along with their expressivity. The teachers completed a rating scale to measure children's social withdrawal. The collected data was analyzed using descriptive statistics, Pearson's productive correlation coefficient, and hierarchical multiple regressions. The results showed a relation between mothers' distress reactions and punitive responses and children's social withdrawal. A mother's positive expressivity was negatively related to a child's social withdrawal. A hierarchical regression analysis indicated that the effects of mothers' punitive responses and minimization responses on children's withdrawal were moderated by a mother's positive expressivity. Mothers' punitive responses and minimization responses were positively associated with children's social withdrawal, especially for children who had the lowest level of mother's positive expressivity.

• 아동학회지
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• 제37권4호
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• pp.169-179
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• 2016

Objective: This study investigated the moderating and mediating effects of flourishing among child-care teacher's emotional labor and burnout. Methods: The participants included 243 child-care teachers in daycare centers in Jeju. To verify moderating effect of flourishing in relation between surface acting and burnout, 2-way ANOVA was used. To verify mediating effect of flourishing in relation between deep acting and burnout, the hierarchical regression and bootstrapping analyses were used. Results: First, the surface acting of emotional labors showed significantly positive effect with burnout and the deep acting of emotional labors shows significantly negative effect with burnout. And the surface acting of emotional labors shows significantly negative effect with flourishing and the deep acting of emotional labors shows significantly positive effect with flourishing. Also the flourishing shows significantly negative effect with burnout. Second, it was revealed that the flourishing plays a role as moderator in relation between surface acting and burnout. Finally, it was revealed that the flourishing plays a role as mediator in relation between deeping acting and burnout. Conclusion: This study illustrates that flourishing acts as differently in relation to emotional labor (surface acting/deep acting) and burnout.