• Korea journal of population studies
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• v.35 no.1
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• pp.77-99
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• 2012

This study aimed at developing a model for estimating fertility rates for Korea under some conditions. The model is expected to provide the basic information for establishing and evaluating the polices in prompt and adequate response to low fertility and population ageing. The model was established on the basis of experiences by some OECD countries in Europe, having experienced the fertility increase trend and being economically well-developed, because Korea has never experienced the steady increase in fertility rate since 1960. This study collected about 20 years' time series data for each of selected countries and applied to the regression model, which is called a 'panel analysis' to take into considerations both cross-sectional and longitudinal aspects of fertility change simultaneously. Simulation of the model for Korea and some panel countries showed a very small difference, less than 0.1, between the estimated rate and the observed rate for each year during 2006~2010. Thus, the model, as established in this study, is evaluated as accurate or well-fitted to a considerable extent.

• The Journal of the Korea Contents Association
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• v.19 no.5
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• pp.472-483
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• 2019

This study purposed to analyze how teacher experience of instructional change (EIC), teacher morale (TM), and school climate (SC) mediate or moderate the relationship between teacher efforts on instructional improvement (EII) and teacher efficacy (TE). For the purpose, the 6th year data of Gyeonggi Education Panel Study (GEPS) which was administered in 2017 for the 9th grade students and their teachers from 197 middle schools in Gyeonggi Province was used. As results, the mediation effects of EIC on the link between EII and TE was found only under the innovative climate. The moderation effects of TM on the connection between EIC and TE were appeared in both of the permissive and the innovative climate. Finally, the moderated mediation effects of the TM in the innovative climate were bigger rather than in the permissive climate.

• Journal of Digital Convergence
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• v.20 no.3
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• pp.517-527
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• 2022

This study aimed to compare changes in cognitive function, depression and ability to perform activity of daily living (ADL) in patients with dementia, mild cognitive impairment (MCI), and ischemic stroke (IS) and to identify factors associated with changes in instrumental ADL. A total of 86 patients (dementia=30, MCI=32, and IS=24) were included to analyse cognitive function, depression, and basic and instrumental ADL obtained at the time of diagnosis and 1 year after baseline. Repeated measures analysis of variance and multiple linear regression were used. A significant group by time interaction was found in executive function (p=.037) and instrumental ADL (p=.023) across groups. The MCI group has little change in executive function and instrumental ADL from the baseline to 1 year after diagnosis while other two groups showed changes with the dementia group showing declines and the group of IS having improvement in these factors over time. Changes in executive function(p=.030) and basic ADL (p<.001) explained 26.9% in the variance of changes in instrumental ADL. These findings showed a different changing pattern in executive function during the first year after diagnosis of dementia, MCI, and IS which have cognitive changes as their main symptoms, probably leading to a different changing pattern in instrumental ADL. Healthcare professionals should routinely assess for executive function and instrumental ADL problems and intervene to maintain and improve these functional outcomes immediately after disease.

• Journal of the Korean Society of Clothing and Textiles
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• v.32 no.12
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• pp.1878-1890
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• 2008

The main objective of this study was to examine how Chinese consumers' perceptions toward Korean apparel products have changed over the years. Specifically, motives for purchasing Korean apparel products, information sources, purchase criteria and evaluation on Korean apparel products were investigated. Data were collected in 2002, 2003, 2005, and 2007 from young female Chinese in Beijing, China during the months of June and July. A total of 603 questionnaires were collected and 578 were used in the final analysis. The results of two-way analysis of variance by year and purchase experience indicated that in overall, purchase motives and importance of various information sources changed greatly over the years, while evaluation on Korean apparel products have remained relatively stable. In comparison to the longitudinal changes in Chinese perception toward Korean apparel products, Chinese consumers' perception toward Korean apparel products did not differ significantly in most of variables according to purchase experience.

• International Journal of Highway Engineering
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• v.10 no.3
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• pp.221-230
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• 2008

In Korea, Expressway and National Highway System has been continually managed by their own pavement management system. The pavement condition evaluation system has not been developed for the municipal roads except for Seoul city. Therefore, this study focuses on analyzing the characteristics of distress in major city's pavement and developing the pavement condition index for the municipal PMS. Panel rating and pavement condition survey for the selected pavement sections were conducted for developing pavement condition index. Municipal level pavement condition index(MPCI) was developed by statistical analysis. Also, a sensitivity analysis for each independent variable of the MPCI and comparison with other pavement condition indicies, such as SPI and HPCI, were performed.

• Proceedings of the Korea Water Resources Association Conference
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• 2016.05a
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• pp.361-361
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• 2016

기상이변으로 인하여 최근 10년 동안 해마다 홍수와 가뭄 피해가 극심하였고 그에 따른 경제적 손실 또한 증가하고 있다. 이에 우리나라에서는 4대강 살리기 사업으로 다기능보 건설 및 준설을 통하여 용수확보 및 홍수조절능력을 향상시키고자 하였다. 하지만 그로인해 하천환경이 많이 변하였으며, 그에 따른 하도의 안정성 확보 및 효율적인 유지관리가 요구되는 상황이다. 체계적인 하천관리를 위해서는 24시간/365일 하천상황 분석과 함께 실시간 수리학적 체류시간 분석 등을 통한 하천 및 하도내 수자원 관리 기초자료 필요성이 요구된다. 따라서 본 연구에서는 변화된 하천을 정확히 반영하고, 보의 운영조건을 고려한 2차원 수리해석을 실시하여 하천관리를 위한 기초 자료를 제공하고자 한다. 다기능보의 지형조건과 운영조건을 반영할 수 있는 EFDC 모형을 이용하여 낙동강에 대해 2차원 수리모형을 구축하였다. 자료기반모형을 이용하여 지류 유입량을 예측하여 적용하였으며, 보 상류 및 하류부 수위를 상 하류단 경계조건으로 구성하였다. 이를 통해 보별 유입량 및 보 상류의 주요지점의 수위, 유량에 대한 다양한 조건을 확정론적 방법과 추계학적 방법으로 분석하여 주요지점에서의 유량 및 수위 수문곡선, 수위/유량 종단양상, 주요지점별 도달 시간 등을 제시하였다. 또한 확정론적 수위 및 유량의 홍수기 및 저 갈수기, 계절 및 분기, 일단위및 시단위 등의 시계열 결과를 도출하였으며, 유량규모별 전파 양상을 분석하여 강우-유량-도달 시간의 조건표를 제시하여 보의 운영에 직접적으로 활용할 수 있도록 하였다. 본 연구를 통해 낙동강에서의 하천관리를 위한 기초자료를 제공할 수 있으며, 다양한 조건에 대한 보 운영 및 하천 유지관리의 가이드라인을 제시할 수 있을 것으로 판단된다.

• Journal of Gifted/Talented Education
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• v.23 no.1
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• pp.49-65
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• 2013

The purpose of this study is to investigate the longitudinal impact of the engagement of private tutoring on student achievement and the influence of the engagement of gifted education on the effect of private tutoring by applying hierarchical linear growth modeling technique on the KELS (Korean Education Longitudinal Study) data. For the analysis, we used KELS data including the score of Mathematics achievement from 2005 to 2007 in order to get useful variables like whether or not to engage private tutoring, weekly time and monthly cost of private tutoring, the experience of gifted education, gender, prior achievement of 6th grade, parents' monthly income, internal motivation and self-efficacy. The sample consisted of 4,435 7th graders from Korean middle schools who were included in the KELS and have the data available to a significant dataset having no missing values include. The result suggest that the private tutoring experience predicted students' high Mathematics achievement and the interaction between grade and private tutoring time and cost has negative impact on the mathematics achievement. In contrast, it was found that the experience of gifted education has negative impact on the growth of mathematics achievement, but positive impact on the effect of private tutoring cost on the mathematics achievement. In other words, the experience of gifted education shows affirmative impact on the effect of private tutoring cost on the mathematics achievement indirectly. On the basis of this results, we discussed deeply the effect of private tutoring on the Mathematics achievement and the influence and its meaning of the experience of gifted education on the effect of private tutoring.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.20 no.12
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• pp.348-356
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• 2019

The purpose of this study was to identify latent classes in changes of mothers' daily life stress over six years from multicultural families and to test its relationship with early adolescents' perceived neglecting parental attitudes and their academic achievements. For achieving this purpose, as the study sample 1,039 students were gathered from the 4th grade of elementary school to 3rd grade of middle school, using Growth Mixture Modeling, Multiple Group Analysis, and One-way ANOVA. The results were as follows. First, latent classes of mothers' daily life stress were categorized into three types: high-stable trajectory, moderate-changing trajectory, and low-changing trajectory. Second, these three types showed different characteristics in early adolescents' perceived neglecting parental attitudes and academic achievements. Third, early adolescents' perceived neglecting parental attitude were not significant determinants of the latent classes while academic achievements were. The findings of this study may provide a framework for understanding the relationships among mothers' daily life stress and early adolescents' perceived neglecting parental attitudes and their academic achievements in multicultural families and practical implications for providing social support to overcome daily life stress of mothers in multicultural families.

• Journal of Korean Society of Forest Science
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• v.76 no.2
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• pp.161-168
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• 1987

Forest road (10 Km) constructed for the demonstrational purpose by Forest Work Training Center (F.T.C.) in 1984 was partly damaged through the roadside landside and ditch erosion by the typhoon in 1986. The causes were investigated to apply for protecting against the damage of mountain forest road. The damaging length caused by roadside landside is around 3% out of total length of 10 Km forest road, and mostly coming from the curve road filled up more than 10 m slope length on the concave mountain slope, partly from the foot of fillslope along the ever-following valley and from the both side of fillslope under the outlet of culvert with ever-flowing water. In case of ditch erosion, the big damage at V-type ditch is coming from the overflow of valley water flowing down along the inside slope. Other problem is also showing in the steepness of longitudial gradient, which is felt as a problem in road to be constructed under more than 10 persent of gradient. Other cause of ditch erosion is coming from the bury of sand basin (water collecting wall) by the debris in small diameter culvert zone, namely less than 400mm, in diameter and by the soil mass slumped down from steep wall slope. From above results the causes of F.T.C. model road damage is showing to come from no-following the general guide or little experience to protect against the forest road damage. When improved above mentioned mistakes, F.T.C. Method of mountain forest road type could be developed as a model of Mountain forest road.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.26 no.5D
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• pp.783-796
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• 2006

Rut-resistance pavement is adopted to prevent pavement from plastic deformation since 1998. The objective of this paper is to investigate performance and economic efficiency between rut-resistance pavement and conventional hot-mix asphalt(HMA) on national highway. The pavement deterioration models incorporated in HDM-4 have been calibrated and adapted to local road conditions based on observed pavement rut-depth data. Based on calibration result of HDM-4, the economic evaluation including road agency cost and user cost is performed for 34 road pavement sections. Furthermore, we presented optimal timing for maintenance and performance levels subject to different budget. We found that rut-resistance pavement is performing better than conventional hot-mix asphalt in most road sections. Furthermore, we confirmed that the application of HDM-4 is useful for pavement project planning and evaluation. More investigation is needed to enlarge the scope of the pavement data and to explore more deeply socio-environmental cost and delay cost.