• Journal of the Korean Data and Information Science Society
• /
• 제25권5호
• /
• pp.1107-1116
• /
• 2014

In this paper, we review recent developments in network analysis using the graph theory, and introduce ongoing research area with relevant theoretical results. In specific, we introduce basic notations in graph, and conditional and marginal approach in constructing the adjacency matrix. Also, we introduce the Marcenko-Pastur law, the Tracy-Widom law, the white Wishart distribution, and the spiked distribution. Finally, we mention the relationship between degrees and eigenvalues for the detection of hubs in a network.

• 한국콘텐츠학회논문지
• /
• 제21권5호
• /
• pp.409-421
• /
• 2021

본 연구는 청소년의 스마트폰 의존도, 공격성 및 부모 양육방식 간의 관계를 규명하고, 스마트폰 의존도와 공격성에 대한 부모 양육방식의 매개효과를 검증하는 데 목적이 있다. 첫째, 청소년의 스마트폰 의존도는 부모 양육방식 및 공격성에 부적 및 정적 상관관계가 있는 것으로 나타났다. 둘째, 청소년의 스마트폰 의존도는 부모의 긍정적 양육방식을 매개로 청소년의 공격성에 부적으로 유의한 영향을 준 반면, 스마트폰 의존도는 부정적 양육방식을 매개로 공격성에 정적으로 유의한 영향을 준 것으로 나타났다. 즉, 청소년의 스마트폰 의존도는 공격성을 높였으며, 이 때 부모의 긍정적 양육방식(따스함, 자율성지지, 구조제공)은 스마트폰 의존도를 매개하여 청소년의 공격성을 낮춘 반면, 부모의 부정적 양육방식(거부, 강요, 비일관성)은 스마트폰 의존도를 매개하여 공격성을 높이는 것으로 나타났다.

• 한국도서관정보학회지
• /
• 제20권
• /
• pp.317-349
• /
• 1993

The purpose of this study lies in identifying Korean scientists' dependency on foreign scientific and technical information (STI), with emphasis on investigating the causes and results. Especially, this study intends to investigate the impacts that a growing dependency on foreign STI might have brought and will bring about on the development of indigenous STI in ROK. To the end, the present discussion covers the following specific research questions: 1) what are the major information sources used by Korean scientists to locate STI necessary for research-related activities\ulcorner 2) to what extent do Korean scientists use foreign STI for research-related activates, as compared to the use of domestic STI\ulcorner 3) what are the major factors causing the information dependency among Korean scientists and what are the results of the growing information dependency\ulcorner And finally, 4) what suggestions can be made for ROK to further its indigenous STI development, while minimizing its dependency on foreign STI\ulcorner Survey method, together with citation analysis method, is employed as the major data collection technique. The survey sample consists of 167 most 'representative' Korean scientists selected on the basis of their research productivity. 167 specially-designed questionnaires were mailed and 104 out of 167 were responded. Follow-up interviews were carried out for 32 out of 104 respondents, who returned the questionnaire but did not answer some specific questions. The data collected from these 104 respondents were analyzed on the basis of two distinguished groups namely, junior and senior scientist groups. Among the 104 respondents, 58 a n.0, ppeared to belong to a group of senior scientists (older than age 45 and finished their final degrees since 1980), and 46 belonged to a group of junior scientists (younger than age 45 and finished their final degrees before 1980). The major findings of the present study include: 1) Korean scientists regard 'scientific and technical journals and books'as the most important information source to obtain the recent STI; 2) their dependency on foreign STI, for the purposes of research and teaching, is extremely high (information dependency for research activities is 88.5%, and that for teaching activities 91.2%); 3) the information dependency of junior scientists are higher than that of senior scientists; 4) Korean scientists' growing information dependency is closely related to both small quantity and low quality of domestically-produced STI, and has a statistically significant relationship with their educational background; and finally, 5) in order to theoretically explain the growing information dependency of Korean scientists, a hypothesis - 'chronic cycle of information dependency' was developed and introduced. The present study suggests the promotion of indigenous STI as a desirable alternative to escape from the 'chronic cycle of information dependency. Localization of the imported foreign STI is suggested as a good strategy for the indigenous STI development, and also suggested are STI policies for both success of localization process and promotion of more efficient STI flows at national and international level.

• 사회복지연구
• /
• 제47권3호
• /
• pp.251-277
• /
• 2016

본 연구의 목적은 청소년의 휴대전화 의존과 우울 및 공격성 간의 관계를 부모양육태도와 또래관계의 매개효과를 검증하여 청소년복지 실천적 함의를 모색하는 것이다. 이를 위하여 한국청소년정책연구원의 한국아동 청소년패널조사(Korean Children and Youth Panel Survey, KCYPS)의 초등학교 4학년 4차년도와 5차년도 자료를 이용하여 중학교 1학년 시기의 청소년 휴대전화 의존과 중학교 2학년 시기의 우울과 공격성간의 관계에서 부모양육태도와 또래관계의 매개효과를 구조방정식모형으로 분석하였다. 연구결과 청소년의 휴대전화 의존은 우울과 공격성에 직접적인 정적 영향을 미치는 것으로 나타났다. 둘째, 부모양육태도와 또래관계의 매개효과를 분석한 결과, 부모양육태도와 또래관계 모두 휴대전화 의존이 우울에 미치는 영향과 공격성에 미치는 영향을 부분 매개하는 것으로 나타났다. 즉, 휴대전화 의존은 긍정적 부모양육태도를 감소시키며 이는 청소년의 우울과 공격성을 모두 증가시켰으며, 휴대전화 의존은 또래관계를 악화시키며 그로 인해 청소년의 우울과 공격성을 증가시키는 것으로 나타났다. 이러한 연구결과를 바탕으로 휴대전화 의존과 부모양육태도, 또래관계를 개선하여 청소년의 우울 및 공격성을 완화시키기 위한 실천적 개입 방안을 모색해 보았다.

• Preventive Nutrition and Food Science
• /
• 제12권2호
• /
• pp.111-114
• /
• 2007

Water vapor adsorption kinetics of Inonotus mushroom powders were investigated in temperature and water activity ranges of 20 to 40$^{\circ}C$ and 0.30 to 0.81, respectively. Initial water vapor adsorption rate of mushroom powders increased with increases in temperature and water activity. The temperature dependency of water activity followed the Clausius-Clapeyron equation. The net isosteric heat of sorption increased with an increase in water activity. Water vapor adsorption kinetics of the mushroom powders can be well described by a simple empirical model. Temperature dependency of the reaction rate constant followed the Arrhenius relationship. The activation energy ranged from 56.86 to 91.35 kJ/mol depending on water activity. Kinetic compensation relationship was observed between k$_o$ and E$_a$ with the isokinetic temperature of 790.27 K.

• Journal of the Korean Data and Information Science Society
• /
• 제26권4호
• /
• pp.1017-1025
• /
• 2015

In mathematical statistics education, we can use mutual information as a tool for evaluating the degree of dependency between two random variables. The ordinary correlation coefficient provides information only on linear dependency, not on nonlinear relationship between two random variables if any. In this paper as a measure of the degree of dependency between random variables, we suggest the use of symmetric uncertainty and ${\lambda}$ which are defined in terms of mutual information. They can be also considered as generalized correlation coefficients for both linear and non-linear dependence of random variables.

• 정신신체의학
• /
• 제4권2호
• /
• pp.182-197
• /
• 1996

For the purpose of examining the relationship between smoking, perceived stress and vulnerability factors, and furthermore suggesting interventions to reduce excessive smoking and prevent nicotine dependency effectively, the questionnaires of perceived stress(stressful experiences), ways of stress coping(passive and active copings), smoking motives, social influence, age, amounts of smoking, and nicotine dependency were administered to smokers among medical students in Chosun university(n=186). 1) As a result of classifying smokers by the types of smoking, the most was a type of smokers to reduce negative emotions and the next in order were addictive smokers, smoker for stimulation, smoker for pleasure, etc. 2) The effects of motive, age, and active coping style were significant, but the effects of perceived stress, passive coping style, and social influence were not significant in average amount of daily smoking. 3) The effects of motive, social influence, and age were significant, but the effects of perceived stress, passive and active coping styles were not significant in the degree of nicotine dependency. To summarize, it is concluded that there were a lot of people who smoke to solve negative emotions, but the direct effects of perceived stress and passive coping style on both average amounts of daily smoking and the degree of nicotine dependency were not significant. On the other hand, motive, age, active coping style, and social influence were proved to be more important variables than the others in explaining college students' smoking.

• 한국수산과학회지
• /
• 제25권4호
• /
• pp.322-323
• /
• 1992

• 한국생활과학회지
• /
• 제23권2호
• /
• pp.163-174
• /
• 2014

This study aimed to discriminate the groups clustered by mobile phone dependency and use type and to explore the quality of parent child-rearing attitudes and peer relationships predicting the types of groups. The subjects were the 688 fourth-grade students participating in the Korea Child Youth Panel Surveys. The data were analyzed with descriptive statistics, cluster analysis, One-way ANOVA and multinominal logistic regressions. The main results of this study were as follows. Firstly, as the result of cluster analysis inputting the mobile phone dependency and use type, the four clustered groups were produced. Secondly, the quality of parent child-rearing attitudes and peer relationships discriminating the four groups were parents' supervision, over-involvement, love, senses of non-alienation from peers and communicating with them. Therefore, this study suggested the parent education and peer-relationship improving program to form children's good habits of mobile phone use.

• 기본간호학회지
• /
• 제17권3호
• /
• pp.382-390
• /
• 2010

Purpose: This study was done to identify the relationship of perceived health, coping strategies, dependency, suicidal ideation and depression widowed elders, and to identify predictors of depression in this population. Method: The research design for this study was a descriptive survey design using a convenience sampling. Data collection was done using self-questionnaire with 162 elders from welfare centers for senior citizens located in 3 cities, Seoul, Gangneung and Seosan. Pearson correlation coefficients and stepwise multiple regression with the SPSS Win 12.0 Program were used to analyze the data. Results: Depression had significant negative correlations with perceived health (r=-.525, p<.001), and coping strategies (r=-.253, p=.005) and positive correlations with dependency (r=.430, p<.001), and suicidal ideation (r=.473, p<.001). The explained variance for depression was 47.5%. Of the variables, perceived health (${\beta}=-.237$, p=.003), suicidal ideation (${\beta}=.398$, p<.001) and dependency (${\beta}=.341$, p<.001) significantly predicted the degree of depression. Conclusion: Findings from this study provide a comprehensive understanding of depression and related factors for widowed elders in Korea. However, further study with a larger random sample and more a detailed research design is necessary.