• Korean Educational Research Journal
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• v.40 no.3
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• pp.1-16
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• 2019

The purpose of this study is to explore the factors related to high school students 'academic stress. This study uses data from KEDI's(KELS 2013 6th). The data were analyzed using descriptive statistics, Pearson correlation analysis, and hierarchical analysis using the SPSS Statistics program. The results of the study are as follows. First, personal factors, social support factors, and family-related factors showed statistically significant correlation with academic stress. Second, personal factors, family-related factors, and social support factors were all found to have statistically significant effects on high school students' academic stress. After controlling the personal factors and family-related factors, the social support factors further explain the academic stress of high school students by two percent, and the most influential variable among social support factors was the relationship with their parents.

• Korean Journal of Social Welfare
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• v.69 no.3
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• pp.141-164
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• 2017

The purpose of this study is to understand the school achievement of domestic adopted children in Korea and its related factors. Although the developmental outcomes of domestic adopted children were the focus of research interests, their school achievement has never been fully addressed in Korea. The subsample (9-17 years old) of 5th wave data of was used for the analysis. The results showed that the school achievement level of domestic adopted children was not significantly different from their non-adopted peers during elementary school years except the mathematics, but changed drastically after they entered the middle school, showing significantly lower level from their non-adopted peers. Factors related with the overall school achievement were the level of school, maternal education, age at adoption, child's self-esteem and school adjustment. For specific subject, however, significant factors were found to be somewhat different. Based on the results of the study, the practical guidelines to improve the school achievement of adopted children were suggested. Also, suggestions for the following studies were made.

• 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.

• Korean Journal of Social Welfare
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• v.68 no.3
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• pp.105-125
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• 2016

School absenteeism is considered one of the early predictors of school drop-out and serious delinquency or criminal behavior. The primary goal of the current study was to explore the protective and risk factors related to changing school absenteeism over time based on the ecological-systemic perspective. The data was derived from the Korean Children and Youth Panel Survey (KCYPS) using the 2011 and 2012 survey waves collected from 2,378 elementary school students. Using this data, Panel Fixed Effects Analysis was conducted. Major findings indicated that daily computer usage, parental abuse, school activity attendance, and school grades had an effect on students missing school days over time. Specifically, high levels of computer usage and parental abuse were related to increased school absenteeism, while high levels of school activity attendance and school grades were associated with decreased school absenteeism. These findings emphasized the importance of predictive intervention for children and suggested the need to construct a school absenteeism monitoring system in South Korea.

• The KIPS Transactions:PartC
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• v.18C no.6
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• pp.423-432
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• 2011

Recently, OpenFlow has been paid attention to as a fundamental technology which provides a function of virtualization and programmability in network. In Korea, deployment of OpenFlow networks in campuses and the interconnection between them through tunneling in layer 3 has been performed. However, the performance of the interconnected networks is decreased due to delay in IP layer. In this paper, we design and deploy nation-wide, not local, OpenFlow networks in a pure layer 2 environment over KREONET. After that, we do end-to-end Round-trip Time measurements and TCP/UDP performance tests in OpenFlow and normal networks, and do comparison and analysis on the test results. The results show that the nation-wide OpenFlow networks provide equal performance to normal networks except for the initial packet loss for UDP streaming. In regards to the performance decrease due to early UDP packet loss, we can mitigate it by implementing exceptional procedures in a controller which deal with the same continuous "Packet_in" events.

• Journal of Digital Convergence
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• v.19 no.9
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• pp.361-371
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• 2021

This study investigated the longitudinal effect of peer play behavior (PPB) during toddlerhood on social competence (SC), followed by the effect on adaptation to elementary school. Data were collected from the 4th to 9th Panel Study on Korean Children between 2011 to 2016, of which the data collected from 114 boys and 94 girls were finally analyzed. Multi-Mediator Model Analysis were performed using SPSS and PROCESS macro programs. First, PPB observed at the age of three significantly predicted PPB observed at ages four and five. It significantly affected SC observed at the age of six after transitioning through PPB at each stage. Second, PPB observed at the age of three significantly impacted the degree of adaptation in the first and second grades of elementary school. The medium identified in this second finding was PPB observed after the age of three and SC observed at the age of six.

• 한국노년학
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• v.38 no.3
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• pp.667-683
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• 2018

This study reviews advances in research made during the last decade in studies of aging families in Korea. Specifically, we provide a critical review of the theoretical directions and empirical findings of 87 research articles focused on aging families published in the Journal of the Korean Gerontological Society between 2008 and 2017. Topics and issues covered include: (a) diversity in family structures and households, (b) intergenerational relations, (c) intimate relations, and (d) family problems in later life. We found that while research applying theories and employing advanced methodologies has increased, embracing more diverse theories and ensuring nationally representative panel data from multi-reporters within families will enhance future research in aging and families. The authors conclude that more multidisciplinary and interdisciplinary approaches are needed in the field of family studies and gerontology in Korea.

• 한국노년학
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• v.41 no.3
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• pp.397-420
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• 2021

The paper tried to determine relationships between volunteering and hypertension risks, symptom betterment, activity difficulty occurrences, and medicine treatment among middle-aged and older adults, with a prospective cohort study. Multilevel mixed-effects generalized linear models were used for the analysis of longitudinal panel data collected over 10 years from 2008 to 2018, using 5,867 cohort samples. The results showed that those who volunteered at least 200 hours per year were 3.4 times more lower than not-volunteering in risks of hypertension, those who volunteered yearly 50~99 hours were a lot more improved than not-volunteering in the symptom betterment, those who volunteered yearly at least 200 hours were 7.7 times lower than not-volunteering in activity difficulty occurrences, and those who volunteered yearly 50~99 hours were 2.5 times lower than not-volunteering in the occurrences of medicine treatment. These indicate that volunteering among middle-aged and older adults may have health benefits against incident hypertension. Finally the thesis discusses the study limitations, future directions of studies, and the practices implications.

• Proceedings of the Korea Water Resources Association Conference
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• 2017.05a
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• pp.294-294
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• 2017

본 연구에서는 입력 매개변수의 변화에 따른 하천의 수리특성의 변화를 분석하기 위하여 2차원 수리해석 모형의 입력변수들에 대하여 초기 입력값의 15%~ +15% 범위로 변화시켜 해석하였다. 하도내 구조물 주변의 2차원 부정류 해석으로 각각의 매개변수의 입력값에 따라 나타나는 해석결과 최댓값들의 영향을 검토하여 하도내 2차원 분석결과에서 각각의 매개변수의 민감도를 파악하였다. 2차원 수리해석 입력자료의 민감도 분석을 위하여 수온, 밀도, 난류교환계수, 조도계수, MP(Marsh Porosity)에 대한 초기치를 기준으로 $0%{\sim}{\pm}15%$ 변화된 값을 각각 입력하여 하도내 합류부와 구조물 주변에 나타나는 2차원 수리특성 변화를 분석하고 하도구간의 종단 및 횡단에 대해서 각각 매개변수들의 결과 값에 따라 변화되는 특성을 분석하였다.

• Proceedings of the Korea Water Resources Association Conference
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• 2006.05a
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• pp.515-518
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• 2006

수많은 교각들이 규칙적으로 배치되어 있는 복개하천이나 하천종단교량 등의 경우 개별적인 교각의 후면부에서 발생하는 와류로 인한 에너지 손실이 누적되어 흐름에 큰 저항요인으로 작용한다. 격자기둥의 형상과 종방향 및 횡방향 배치간격이 배수시스템의 통수능에 미치는 영향을 파악하기 위해 본 연구에서는 사각형 및 둥근장방형 격자기둥에 대한 기초적인 수리 실험을 실시하고 그 결과를 분석하였다.