• Korean System Dynamics Review
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• v.15 no.1
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• pp.29-50
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• 2014

This study aims to comprehensively understand the dynamics of the dementia as a social problem and to find out its causes and solutions, using the systems thinking approach. The contents of the study are as follows. Firstly, it examines the existing studies on the dementia, draws their limitations and further presents the major variables to understand the dementia as a social problem. Second, it analyzes the structure of the causation in order to find out the dynamics of the problem. Lastly, it concludes with the suggestions to solve the problem based on its feedback structure presented in the causal loop diagrams. This study is expected to make a useful and basic material to grope for the solutions, as the first research to dynamically understand the dementia as a social problem.

• Journal of the Korea Society of Computer and Information
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• v.22 no.9
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• pp.179-185
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• 2017

The purpose of this study was to investigate the relationships between occupational identity, occupation satisfaction, and self-efficacy of care workers in care hospitals and to draw implications for improving the quality of care services. In order to accomplish the purpose of this study, the occupational identity of care workers in care hospitals as an independent variable, occupation satisfaction as a dependent variable of occupational identity, and self-efficacy as a moderating variable were selected. The causal relationships between occupational identity and occupation satisfaction and the moderating effect of self-efficacy were analyzed. As a result of the analysis, the occupational identity of care workers in care hospitals showed significant effects on occupation satisfaction and job commitment. Also, the effects of occupational identity on occupation satisfaction and job commitment differ depending on self-efficacy, which means that moderating effects of self-efficacy are significant. Based on this analytical results, the theoretical and policy implications of this study were suggested, and the directions and limitations of this study were suggested.

• Culinary science and hospitality research
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• v.20 no.5
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• pp.52-58
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• 2014

The aim of the present study is to investigate the structural relationships of organizational work-family support, job satisfaction, organizational commitment and turnover intention among Korean hotel employees. In order to achieve the study goal, frequency analysis, confirmatory factor analysis, reliability analysis, correlation analysis and covariance structure analysis were undertaken using SPSS(18.0) and AMOS(18.0). The result shows that organizational work-family support has a significantly positive effect on job satisfaction and it also positively impacts on organizational commitment. However, it doesn't have any significant effect on turnover intention. This study also suggests that each of job satisfaction and organizational commitment has a significantly negative effect on turnover intention. Through the abovementioned results, we can find out that each of job satisfaction and organizational commitment can completely mediate the relationship between organizational work-family support and turnover intention.

• Korean Journal of Child Studies
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• v.30 no.6
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• pp.125-137
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• 2009

This study reviews facts and trends of harmful environments in the last decade that negatively affected children's development. Younger children have been exposed to harmful media, drugs, facilities, and objects. A matter of chemical substances contaminating in-door air has become quite controversial, recently. In order to provide a better understanding of harmful environments against children, there are great needs for a survey covering all ages based on the clear definition of the term harmful environments, research identifying its causal effects on child development in the context of both parent-child and peer relationships, and a longitudinal study processing its effects in a life-span perspective. It is suggested that by providing parent education and a plenty of cultural facilities as social efforts to create sound family culture, psycho-social and physical environments of children are improved. Furthermore, legal regulations and supervision on harmful environments are needed to be strengthened.

• Journal of the Korean Home Economics Association
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• v.35 no.1
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• pp.443-459
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• 1997

The purpose of this study were (1) to investigate the effect of environments on the ecological value orientation (2) to examine the effect of environments and ecological value orientation on housewives' recycling behavior and (3) to analyze the hypothesized causal model of the housewives' recycling behavior in order to explain direct and indirect effects of the selected variables. 687 samples were selected from housewives living in Seoul. Cronbach's a, descriptive statistics and stepwise multiple regression were used for data analysis The major findings are as follows: Housewives' recycling behavior In conclusion the result of the path analysis explained the contribution of variables on housewives' household recycling. It was found that the ecological value orientation makes the most significant contribution to household recycling.

• Korean System Dynamics Review
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• v.16 no.2
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• pp.33-52
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• 2015

This study aims to comprehensively understand the dynamics of the community network of Community Child Centers and further find out the measures to activate its community network based on the Systems Thinking. The contents of the study are as follows. Firstly, it examines the existing studies on the community network of Community Child Centers and presents the major variables to understand the situation of its community network. Secondly, it analyzes the structure of its causation in order to understand the dynamics of its community network. Lastly, it concludes with the suggestions to activate its community network based on its feedback structure presented in the causal loop diagrams. This study is expected to make a useful and basic material as the first research to dynamically understand the community network issue of the Community Child Centers.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.14 no.4
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• pp.1796-1816
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• 2020

The health and safety of elderly and disabled patients who cannot live alone is an important issue. Timely detection of sudden events is necessary to protect these people, and anomaly detection in smart homes is an efficient approach to extracting such information. In the real world, there is a causal relationship between an occupant's behaviour and the order in which appliances are used in the home. Bayesian networks are appropriate tools for assessing the probability of an effect due to the occurrence of its causes, and vice versa. This paper defines different subsets of random variables on the basis of sensory data from a smart home, and it presents an anomaly detection system based on various models of Bayesian networks and drawing upon these variables. We examine different models to obtain the best network, one that has higher assessment scores and a smaller size. Experimental evaluations of real datasets show the effectiveness of the proposed method.

• Proceedings of the Korean Environmental Health Society Conference
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• 2005.06a
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• pp.303-305
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• 2005

3-Monochloro-1,2-propanediol (3-MCPD) is a contaminant of acid-hydrolyzed vegetable protein. Several reports have suggested that chronic exposure to 3-MCPD could produce neurotoxicity in vitro or neurobehavioral effects inaspects of experimental animals. Disturbance of the nitric oxide signaling pathway by chronic exposure to 3-MCPD may be a causal factor of neurological disorders in rats. In order to investigate the relationship between 3-MCPD administration and expression of inducibal nitric oxide synthase (iNOS), the numbers and distribution patterns of iNOS-immunoreactive neurons were examined. At the all three bregma level examined, the optical density of iNOS-postive neurons was significantly increased following exposure to 3-MCPD. The change was more severe in the upper layer than in deep layer of the cortex. These data suggest that 3-MCPD toxicity may be mediated through disturbances to the nitric oxide signaling pathway.

• Journal of the Korean housing association
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• v.12 no.4
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• pp.93-104
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• 2001

This study has been performed to analyze size and deficit problem of residential space in later life. In this study, 216 Koreans aged 50 to 79 were surveyed for their current residential space ad family related items such as age, marital status, living arrangement, birth order, and housing status. The results are drawn as follows: 1. The space size significantly fluctuates by marital status, number of generations living together, tenure, and structure type; For example, use of indoor area per person ranges from 7.01 pyoung for three-generation households to 19.53 for one-generation households. 2. s for space deficit, very old widowed females, 60's living in rented or multi-family housing units, and those living in three generations are high risk groups of the space deficit below 7 young per person. In this study, further researches are recommended as follows; Regarding the highest risk group of space deficit, life styles causing space-related conflicts should be studied, and accordingly proper welfare services for the causal life styles be offered. Housing maintenance & utility costs be investigated and guidelines should be proposed for any surplus groups among the 60's, so that their space surplus can be reduced by suitable adjustment process.

• Earthquakes and Structures
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• v.4 no.2
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• pp.181-202
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• 2013

It is well known that the properties of the soil deposits, especially the damping, depend on both frequency and strain amplitude. Therefore it is important to consider both dependencies to calculate the soil response against earthquakes in order to estimate input motions to buildings. However, it has been difficult to calculate the seismic response of the soil considering both dependencies directly. The author has studied the time domain evaluation of the frequency dependent dynamic stiffness, and proposed a simple hysteretic damping model that satisfies the causality condition. In this paper, this model was applied to nonlinear analyses considering the effects of the strain amplitude dependency of the soil. The basic characteristics of the proposed method were studied using a two layered soil model. The response behavior was compared with the conventional model e.g. the Ramberg-Osgood model and the SHAKE model. The characteristics of the proposed model were studied with regard to the effects of element divisions and the frequency dependency that is a key feature of the model. The efficiency of the model was confirmed by these studies.