• Journal of Digital Convergence
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• v.16 no.6
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• pp.53-61
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• 2018

In this study, we investigated whether the model attributes of CSR ads (value addition, attractiveness, expertise, trustworthiness) affect the attitude of the company. We also examined the mediating role of message authenticity in the model attributes and corporate attitudes of CSR advertisements. The results of the study are as follows. First, the value addition, attractiveness, and reliability of the CSR advertising model have a positive effect on the message authenticity of the CSR advertisement. Second, the attractiveness and expertise of the CSR advertising model have a positive effect on the attitude of the company. Third, the effects of the CSR advertising model on the value addition, attractiveness, and reliability are completely mediated by the message authenticity of the CSR advertisement. The results of this study suggest that it is effective to select the models with value addition, attractiveness, and expert image when producing CSR advertisements.

• Journal of The Korean Association of Information Education
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• v.15 no.4
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• pp.645-660
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• 2011

The purpose of this study is to identify the causal relationship among perceived instrumentality, mastery goal orientation, self-regulated learning and academic achievement in cyber education. 317 current students of the W cyber university participated in the study. The results of structural equation modeling analysis are as follows: First, endogenous instrumentality affects mastery goal orientation. Second, mastery goal orientation affects self-regulated learning. Third, while exogenous instrumentality had negative effect on academic achievement, self-regulated learning was the only variable that had positive effect on academic achievement. In addition, the result indicated that endogenous instrumentality had indirect effect on academic achievement and self-regulated learning mediated between mastery goal orientation and academic achievement.

• The Journal of Korean Association of Computer Education
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• v.18 no.1
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• pp.55-68
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• 2015

The purpose of the study is to examine a structural relationship among mobile self-efficacy, mobility, perceived ease of use, perceived usefulness, and intention to use of a mobile learning service using technology acceptance model. The result revealed that mobile self-efficacy, mobility had a direct effect on perceived ease of use. Second, mobile self-efficacy, mobility, perceived ease of use had a direct effect on perceived usefulness. Third, mobile self-efficacy, mobility, perceived usefulness had a direct effect on intention to use of a mobile learning service. However, perceived ease of use did not have a effect on behavioral intention of mobile learning service.

• Journal of Environmental Policy
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• v.8 no.2
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• pp.145-164
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• 2009

Environmental problems, such as the depletion of natural resources, global warming, and the destruction of ecological systems, are among the most serious problems facing the planet. Since the early 1990's, many OECD countries have undertaken green tax reforms by introducing new environmental taxes to protect the environment. Environmental taxes have been used as an instrument of environmental policy more than direct regulation because economic instruments have a comparative advantage over direct regulation in terms of cost effectiveness and pollution abatement incentives. However, one important reason why green tax reforms have not progressed is due to fears regarding the negative effect of environmental taxes on international competitiveness in the industry and trade sectors. The main purpose of this paper is to analyze the effects of environmental taxes on industry and trade by using a theoretical model to compare the effects of environmental taxes on pollution-intensive and energy-saving industries.

• Journal of the Korean Home Economics Association
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• v.33 no.4
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• pp.173-188
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• 1995

This study examined the characteristics of the relationship of HOME, sociodemographic variables and children's verbal ability at age four, five, six, Expecially this study investigated causal relationships amoong the variables which are supposed to affect children's verbal ability by children's age and sex. The subject of this study were 180 children and their mothers. Instruments included inventory of home stimulation(HOME), inventory of socio-demographic variables, inventory of the children's verbla ability. The results obtained from this study were as follows : 1. For the most part, HOME and socio-demographic variables had a significant positive correlation with children's verbal ability. 2. The variables that significantly predicted children's verbal ability differed according to children's age and sex. That is, play materials, breadth of experience and economic status of the home were predictive of boy's verbal ability at age four, while aspects of physical environment, breadth of experience were predictive at age five, fostering maturity and independence, parent's education were predictive at age six. And developmental stimulation and breadth of experience were predictive of girl's verbal ability at age four, while developmental stimulation, economic status of the home were predictive at age five, developmental stimulation and play materials were predictive at age six. 3. the results of the analysis of the causal model showed that the kind of variables that affected children's verbal ability directly differed according to children's age and sex. That is, indirect stimulation and direct stimulation affected boy's verbal ability directly at age four and five, while indirect stimulation and parent's education affected boy's verbal ability at age six. And indirect stimulation, direct stimulation, emotional climate of the home affected girl's verbal ability directly at age four, while direct stimulation, economic status of the home, indirect stimulation affected directly at age five, parent's education, indirect stimulation and direct stimulation affected girl's verbal ability at age six. 4. Another causal model of the HOME, socio-demographic variables affecting children's verbal ability showed that total HOME scores more significantly affected boys and girl's verbal ability directly than socio-demographic variables at all ages.

• Proceedings of the Korea Water Resources Association Conference
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• 2011.05a
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• pp.415-415
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• 2011

수문학 또는 하천유출은 크게 기후학적은 인자 (온도, 바람, 상대습도 등)나 지형학적 인자 (지표면 경사, 흙의 종류, 하천의 면적, 하천의 길이 등)들에 의해 결정된다. 지형학적 인자들 중인 하천의 면적 그리고 주하천의 길이에 의한 영향은 비첨두홍수량의 과 수문곡선의 모양에 크게 관여되어 있다. 일반적으로 유역형상이 좁고 주하천의 길이(유로연장)가 긴 하천의 경우 단위면적당 유출량과 시간과의 그래프에서 수문곡선은 넓고 낮은 형태 모습을 지니지만 유역의 형상이 넓고 주하천의 길이기 짧은 하천은 수문곡선이 좁고 높은 형태의 모습을 가진다. 이러한 유역형상의 차이에 따라 Horton (1932)은 유역의 면적과 주하천의 길이의 비로 형상계수 (Shape Factor)의 공식을 제시하였다. 유역면적에 비해 유로연장이 길면 형상계수가 작아지고 첨두홍수량이 작아지는 반면 유역면적에 비해 유로연장이 짧을수록 형상계수가 커져 첨두홍수량이 커지는 형상을 발견할 수 있다. 형상계수와 비첨두홍수량의 상관관계를 알아보기 위하여 상수 전용댐 안전성 대책 및 치수능력 증대 방안연구 (2008) 보고서에서 적용한 유역들을 비교하였다. 이 보고서에 있는 38개의 유역들 중에서 형상계수가 0< <1 인 유역들을 선택한 후 형상계수와 지속시간별 비첨두홍수량의 관계 그리고 유역면적과 지속시간별 비첨두홍수량의 관계를 도시하였다. 추세선에 의한 결정계수인 $R^2$ 의 값을 비교하여 형상계수와 비첨두홍수량과의 관계를 조명하였다. 또한, 형상계수에 따른 순간단위도의 첨두시간 및 첨두유량을 비교하기 위하여 유역면적이 $300m^2$내외이며, 서로 다른 형상계수를 갖는 유역을 선정하여 연구를 진행하였다. 대상유역의 관측값을 이용하여 Nash모형을 적용한 순간단위도를 산정하였으며, 형상계수에 따른 첨두시간 및 첨두유량의 비교분석을 수행하였다.

• Proceedings of the Korea Water Resources Association Conference
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• 2007.05a
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• pp.841-845
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• 2007

낙차공(drop structure)은 치수목적의 하천정비를 위한 주요 수공구조물이다. 하지만 국내외적으로 환경을 고려한 하천공법이 요구되면서 고낙차로 인해 발생하는 수중생물의 단절은 기존 낙차공의 큰 문제로 대두되었다. 이에 기존 고낙차를 이용한 낙차공 보다는 완만한 경사를 가지는 낙차공을 설치함으로써 기존 낙차공에 의해 단절되었던 어류의 이동통로로서의 역할과 주변 경관개선을 위해 설치하고 있는 구조물이 필요하였다. 본 연구는 위와 같은 필요성에서 시작되었으며 완경사 낙차공을 경사형 낙차공이라 정의하고 조건에 따른 흐름특성을 수리실험을 통해 분석하였다. 연구내용은 경사형 낙차공의 경사조건과 하상재료의 입경에 따라 발생하는 에너지 소산에 따른 효율과 구조물 하류부 도수현상에 대한 것으로 이를 통해 경사형 낙차공 조건에 따른 흐름특성을 파악하였다. 수리실험은 폭 0.6m, 길이 20.0m 인 가변경사수로에서 수행하였으며, 하상재료는 크기에 따라 2가지 입경(16mm, 25mm)의 재료를 선정하였고, 구조물 경사에 대해 각각 1V:2H, 1V:3H, 1V:4H, 1V:6H의 경사도를 가지는 모형을 제작하여 실험을 수행하였다. 유량조건 및 도수발생위치는 유입부 수위에 따라 단계별로 4가지 수위조건을 만족시키는 유량을 통수하였고, 하류부 수위를 조절하여 도수위치를 조절하여 유입부(1), 낙차공부(5), 사류부(1), 하류부(1)에 대하여 총 8개 지점을 선정하여 수위$(y_n)$ 및 유속(V), 도수길이(Lr), 도수발생거리(Lj) 등을 측정하였다.

• Journal of the Korean Geosynthetics Society
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• v.16 no.4
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• pp.1-11
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• 2017

In this study, 1/6 small-scale model tests of helical piles were conducted to evaluate their installation time and ultimate capacities. Model sand layers were constructed using sand pluviating method to produce uniform soil relative density. For installation of different helical piles varying locations (vertical center-to-center spacings of 50 mm and 150 mm) of helix plates, two different rotation speeds of 15 rpm and 30 rpm were implemented. Cone penetration equipment was installed within the hallow section of the helical pile to increase ultimate capacity of helical pile and to evaluate soil properties of plugged soils and soils below pile tip after installation of the piles. Based on the test results, the most fasted installation was possible under the condition of "rotation speed of 30 rpm and center-to-center spacing of 50 mm", and the highest ultimate capacity was mobilized under the condition of "rotation speed of 30 rpm and center-to-center spacing of 150 mm with cone penetration implementation."

• Journal of Korea Water Resources Association
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• v.48 no.10
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• pp.781-791
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• 2015

Dam risk analysis requires a systematic process to ensure that hydrologic variables (e.g. precipitation, discharge and water surface level) contribute to each other. However, the existing dam risk approach showed a limitation in assessing the interdependencies across the variables. This study aimed to develop Bayesian network based dam risk analysis model to better characterize the interdependencies. It was found that the proposed model provided advantages which would enable to better identify and understand the interdependencies and uncertainties over dam risk analysis. The proposed model also provided a scenario-based risk evaluation framework which is a function of the failure probability and the consequence. This tool would give dam manager a framework for prioritizing risks more effectively.

• The Journal of the Korea Contents Association
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• v.15 no.5
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• pp.674-683
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• 2015

'Fun' may be a basic desire of all human beings, but studies that combine both education and enjoyment were very limited, with the exception of the sports and games subjects. As a result, this study focused on the fun induced from the actual site of education, beginning under the premise that this can increase the effectiveness of education. In particular, it has been concluded that more fun is especially required in compulsory education that disregards one's opinion, with the Social Service Personnel that are required to undergo two weeks of compulsory job training selected as the test subjects. In order to comprehend how the 'fun factor' from the Social Service Personnel' job training influences the educational effectiveness, the causal relationship between learning flow, group flow and learning satisfaction has been proven using the structural equation model. Through this, the median between fun and education was found, as well as whether fun education has an actual effect on educational effectiveness. In addition, it is an opportuniy to emphasise the need for enjoyable education for not just Social Service Personnel, but for all involuntary learners.