• Korean Journal of Social Welfare
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• v.61 no.1
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• pp.57-79
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• 2009

This study analyzes the effect of poverty on child development outcomes including academic achievement, self-esteem, depression/anxiety, attention problems, aggression, and delinquency. The poverty experiences among elementary school children are longitudinally observed during 3 years between the 4th grade and the 6th grade. When development outcomes are compared among persistently poor children, transitory poor children, and non-poor children, academic achievement is found to be significantly different. The analyses of the relationships between the poverty status and developmental trajectories show that academic achievement among non-poor children has improved over time, while the level of poor children's achievement has decreased. The result also shows that problematic behaviors such as attention problems, aggression, delinquency has improved over time among all the children. Yet, the gap between poor and non-poor children has not decreased. The multivariate analyses indicate that the effect of poverty remains statistically significant only for academic achievement after children's individual and familial characteristics are controlled. Past experiences of poverty in addition to the current poverty affect academic achievement and persistent poverty has a stronger effect than transitory poverty on academic achievement, although the findings are not consistent across all the estimated models.

• Journal of KIISE
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• v.42 no.12
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• pp.1495-1502
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• 2015

Data compression involves a trade-off between delay time and data size. Greater delay times require smaller data sizes and vice versa. There have been many studies performed in the field of wireless sensor networks on increasing network life cycle durations by reducing data size to minimize energy consumption; however, reductions in data size result in increases of delay time due to the added processing time required for data compression. Meanwhile, as energy generation occurs periodically in solar energy-based wireless sensor networks, redundant energy is often generated in amounts sufficient to run a node. In this study, this excess energy is used to reduce the delay time between nodes in a sensor network consisting of solar energy-based nodes. The energy threshold value is determined by a formula based on the residual energy and charging speed. Nodes with residual energy below the threshold transfer data compressed to reduce energy consumption, and nodes with residual energy above the threshold transfer data without compression to reduce the delay time between nodes. Simulation based performance verifications show that the technique proposed in this study exhibits optimal performance in terms of both energy and delay time compared with traditional methods.

• Korean Journal of Child Studies
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• v.22 no.3
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• pp.49-61
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• 2001

This study explored concurrent and prospective relationships of the coping strategies of 4th and 6th grade children in peer conflict focusing on bullying, victim, and prosocial behavior. Instruments were the Self-Report Coping Scale and the Peer Relations Questionnaire. Concurrent results of Study I showed children using more avoidance and fewer approach strategies were more likely to bullies or victims; and children using fewer avoidance and more approach coping strategies were more likely to be prosocial children. Externalizing best explained bullies and victims; seeking social support best explained prosocial children. Prospective results of Study II showed children using more externalizing and fewer problem solving were more likely to be bullies; and children employing internalizing and externalizing were more likely to be victims; and children using more seeking social support were more likely to be prosocial children. It was also found that externalizing at Time I best predicted bullies, internalizing best predicted victims, and seeking social support best predicted prosocial children.

• Korean Journal of Social Welfare
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• v.62 no.4
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• pp.129-148
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• 2010

This study analyzed the effect of poverty on children's health, using data from wave 1-5(2004-2008) lf the Seoul Panel Study of Children surveys(SPSC). The analysis results indicated that poverty has a negative effect on child health over time when controlling for potential variables that mediate the family income-child health association. There was also a strong cumulative effect of poverty that explains much of the strengthening association between the length of poverty and child health. The negative effect of poverty on child health could be enhanced through poor mother-child relationship and marital conflict. This finding suggests that programs to improve child health, by implication, will require family level interventions such as increasing income support and improving care-giving and family interaction.

• Korean Journal of School Psychology
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• v.18 no.2
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• pp.175-195
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• 2021

Intimate friendships and a sense of belonging have positive effects on adolescent's psychological adaptation. Belongingness orientation is the motivation to belong. It is divided into growth orientation and deficit-reduction orientation, both of which have different effects on psychological adaptation and interpersonal characteristics. This study was conducted to determine how adolescents' belongingness orientation affected their psychological adaptation and friend networks. Students in their second year of middle school were surveyed both at the beginning and end of the spring semester. Friend networks were measured through network centrality analysis. Multilevel regression analysis produced three major results. The first major result was that the correlations between growth orientation and loneliness and between growth orientation and stress at the beginning of the spring semester was statistically significant even when friend network centrality was included in the analysis model, but the correlation between deficit-reduction orientation and loneliness and between deficit-reduction orientation and stress were not statistically significant. The second major result was that growth orientation significantly predicted friend network centrality at the end of the spring semester. This effect was significant even when friend network centrality at the beginning of the semester and psychological adaptation level at the end of the spring semester were added to the analysis model. The third major result was that the correlation between friend network centrality at the end of the semester and psychological adaptation level was statistically significant even when psychological adaptation levels at the beginning and the end of the semester were included in the analysis model. This study is meaningful in that it had a short-term longitudinal design and empirically demonstrated the relationship between belongingness orientation and psychological adaptation level of adolescents and between belongingness orientation and the development of friend networks. Lastly, we discussed limitations of this study and provided suggestions for future research.

• 한국노년학
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• v.38 no.4
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• pp.1035-1055
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• 2018

The purpose of this study is to investigate the relationship between public care and family care. Public care for older adults began in 2008 with the implementation of the Long-Term Care insurance in South Korea. Although the expansion of public care has the purpose of reducing the care burden for the family, it is not easy to say whether the developments of public care system reduce the amount of family care for older family members. Theoretically, public care and family care are expected to have various relationships depending on the degree of the role and function(substitution, hierarchical compensatory, task specific, supplementation, complementarity). And literatures have showed inconsistent results depending on the country, data, and methods. In this study, we analyzed the relationship between two care types focusing on home care services for older persons. Analyses were based on data from the second(2008) to sixth(2016) waves of Korean Longitudinal Study of Ageing(KLoSA). To investigate elderly care dynamics in the households, we pooled the data for four changes between two periods(2008-2010, 2010-2012, 2012-2014, and 2014-2016). This study used an analytic sample of 262 older adults, who are aged 55 over and experienced public care at least one point of time. We used Fixed-Effects(FE) model to analyze the differences within the same individuals under the condition that time-invariant unobserved factors are controlled. This study distinguished the cases of entry into public care and other cases of exiting public care. The results showed that older people who are dependent on public care are less dependent on family care than before. In both entry and exit groups, negative relations were maintained, but in the entering stage of public care, the degree of negative relations was relatively small, whereas in the stage of maintaining or departing from public care, relatively negative relations were strong. At the beginning periods, even though public care increased, family care did not decrease significantly. On the other hand, at the time of ending public care and relying on family care, family care increased significantly. The results of this study show that the relationship between public care and family care is close to hierarchical compensatory model and varies according to the stage of caring transition. Also, it was found that the cases of transition from public care to family care have the biggest burden of elderly care than other groups.

• Journal of the Korea Society of Computer and Information
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• v.25 no.9
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• pp.159-166
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• 2020

The purpose of this research is to suggest some practical and policy implications for improving adolescent's self-esteem through analyzing longitudinally the effects of parental attitude, peer relationship, student-teacher relationship, school learning activity, life-goal on adolescent's self-esteem by using latent growth curve model. Analytical data was obtained from the KYCPS. The analytical results showed that the change model of adolescent's self_esteem turned out to be a leaner model in which the change rate and intercept were significant. Second, time dependent variables influence on adolescent's self_ esteem meaningfully. Third, time dependent variables influence on adolescent's self_ esteem changes significantly. This study proposed some policy implications basing on these findings.

• Management & Information Systems Review
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• v.38 no.1
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• pp.121-139
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• 2019

This study aims to identify the change of customer participation(CP) which is essential to the service industry as the relationship between the customer and the employee develops. The latent growth modeling analysis based on the longitudinal data is utilized to examine the pattern of the change. This is based on the fact that CP needs to be understood in the relationship and is to confirm the change in CP by the development of the relationship. Given the dynamics of the relationship, we intend to overcome the limitations of previous cross-sectional researches by revealing the trajectory of CP in the relationship through the longitudinal data. We also want to examine which variables in the relationship can facilitate changes of CP. Research has shown that CP is significantly changed with the development of the relationship when we analyzed it through latent growth modeling. This confirms that CP needs to be understood in the relationship. In addition, 'relationship proneness' variable and 'dependence to provider' variable have positive effects on the initial values of CP, but they have not been established to promote the changes of CP. Consequently, when considering the dynamics of relationships, it is important to recognize that CP is also dynamic. This study sought to get out of the cross-sectional and fragmented understanding of CP that is dynamic. Through this, we would like to propose the successful operation of the customer management program of service firms in relation to CP. This will lead to the success of service encounter where appropriate CP levels at each stage of relationship development can be achieved.

• Korean Journal of Social Welfare
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• v.58 no.4
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• pp.197-217
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• 2006

This study examined whether a relationship between retirement transitions and psychological well-being of the elderly may differ by gender and residential areas, and whether associative factors of psychological well-being may vary by gender and residential areas. The sample included 1,124 older adults aged 60 and over, which derived from the first wave and the third wave data of the "Aging and the Quality of Life of the Elderly in Korea: A Longitudinal Study" living in Seoul and Chuncheon. The total sample was divided into four sub-samples(urban male elders, rural male elders, urban female elders, and rural female elders) to answer research questions. Psychological well-being was measured by measured by the PGCMS developed by Lawton, and a retirement variable had four categories: being continuously non-retired, newly retired, newly non-retired, and being continuously retired with a reference group of being continuously non-retired. Multivariate OLS regression was run separately for the four groups. For urban male elders, retirement transition was associated with worse psychological well-being whereas no relationship between retirement transitions and psychological well-being was found for rural male elders, urban female elders, and rural female elders. Associative factors of psychological well-being varied by gender and residential areas. The findings implies that a relationship between retirement transitions and psychological well-being of the elderly may differ by gender and residential areas, and these differential effects of retirement transitions may be attributable to different life experiences and economic activities through a life course and different roles after retirement. Also, different associative factors of psychological well-being for the four sub-samples reflect variations in their different life course.

• The Journal of Korean Academic Society of Nursing Education
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• v.29 no.4
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• pp.440-449
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• 2023

Purpose: This study aimed to identify the reciprocal relationship between parenting attitudes (positive and negative) and adolescent emotional problems as indicated by aggression, social withdrawal, and depression. Methods: This study analyzed longitudinal data from 2,325 parents and their children from the Korea Children and Youth Panel Survey 2018 at three time points over a three-year period (the first to third grade of middle school). Autoregressive cross-lagged modeling was conducted using AMOS 26.0. Results: The results indicated that both parenting attitudes and adolescents' emotional problems were relatively stable over time. In other words, the parenting attitude at a previous point affects the parenting attitude at a later point, and the emotional problem at the previous point continues to affect the emotional problem at the later point. There were no significant cross-lagged effects from both positive and negative parenting attitudes to adolescents' emotional problems. In contrast, adolescents' emotional problems at previous time points positively predicted negative parenting attitudes at later time points. In other words, if there were many emotional problems of aggression, social withdrawal, and depression in adolescents at a previous time, negative parenting attitudes such as rejection, force, and inconsistency at a later time increased. Conclusion: This study can reflect the characteristics of the development of independence in adolescence. Parents should deal with their children's emotional problems based on their understanding of the developmental characteristics of adolescence, and this study provides a strategy for parents to establish appropriate parenting attitudes for adolescents with emotional problems.