• 디지털융복합연구
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• 제15권4호
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• pp.1-11
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• 2017

본 연구의 목적은 청소년들의 자기주도학습 능력 향상을 위한 SMMIS 모형 기반의 온라인 종합진단검사 도구를 개발하는 것이다. 이를 위해 문헌 분석 및 전문가 검토를 거쳐 초 중학생용과 고등학생용 검사 문항을 개발하였다. 아울러 해석 규준 설정을 위해 총 1,626명의 초, 중, 고등학생을 대상으로 검사를 실시하였다. 그 결과를 토대로 블렌디드러닝 기반 온라인 자기주도학습 종합진단검사 시스템을 개발하였다. 아울러 청소년 대상 블렌디드러닝 기반 온라인 종합진단검사 결과의 구체적 활용 방안과 향후 보완 및 후속 연구 방향에 대해 논의하였다.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2002년도 가을 학술발표회 논문집
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• pp.227-232
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• 2002

To evaluate the practical application of oyster shells as construction materials, an experimental study was performed. More specifically, the long-term mechanical properties and durability of concrete blended with oyster shells were investigated. Test results indicate that long-term strength of concrete blended with 10% oyster shells is almost identical to that of normal concrete. However, the long-term strength of concrete blended with 20% oyster shells Is appreciably lower than that of normal concrete. 1'hereby, concrete with higher oyster shell has the possibility giving a bad influence on the concrete long-term strength. Elastic modulus of concrete blended with crushed oyster shells decreases as the blending mixture ratio increases. Namely, the modulus is reduced by approximately 10∼15% when oyster shells are blended up to 20% replacing the fine aggregate. The drying shrinkage strain increases as the blending ratio increases. In addition, the existing model code of drying shrinkage does not coincide with the test results of this study. An adequate prediction equation needs to be developed. The utilization of oyster shells as the fine aggregate in concrete has an insignificant effect on freezing and thawing resistance, carbonation and sulfuric acid attack of concrete recycling. However, water permeability is considerably improved.

• 산업융합연구
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• 제19권1호
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• pp.27-32
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• 2021

노벨 엔지니어링은 독서를 통하여 문제를 찾아내고, 이를 공학적인 방법으로 해결해보는 융합수업모형이다. 이제까지의 노벨 엔지니어링 연구는 온전히 대면으로 진행되어왔다. 그러나 COVID-19 사태 이후를 대비하여 온라인과 오프라인 수업을 병행한 블렌디드 러닝의 연구가 매우 필요하다. 그래서 본 연구에서는 블렌디드 노벨 엔지니어링 수업이 초등학생들의 창의적 문제해결력 향상에 미치는 영향에 대해서 연구하였다. 연구 결과, 이 수업이 자기 확신 및 독립성, 확산적 사고, 비판적 사고, 동기적 요소 요인에서 기존의 문제해결 프로젝트 수업보다 더 높은 효과가 있다는 것이 증명되었다. 이는 블렌디드 노벨 엔지니어링 수업이 2015 개정 교육과정에서 제시한 역량 중심 수업을 위해서 매우 효과적이라는 것을 의미한다. 이 연구로 인하여 코로나 이후 시대에 블렌디드 노벨 엔지니어링이 학교 현장에 확산되어 정착될 수 있기를 기대한다.

• Advances in aircraft and spacecraft science
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• 제8권4호
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• pp.303-330
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• 2021

The paper discusses the effect of the winglets on the aerodynamic and aeroacoustic performance of Boeing 737-800 aircraft by numerical approach. For this purpose, computational fluid dynamics and fluent commercial software are used to solve the compressible flow governing equations. The RANS method and the K-ω SST turbulence model are selected to simulate the subsonic flow around the wing with acceptable accuracy and low computational cost. The main variables of steady flow around the simple and blended wing in constant atmospheric conditions are computed by numerical solution of governing equations. The solution of the acoustic field has also been accomplished by the broad-band acoustic source model. The results reveal that adding a blended winglet increases the pressure difference near the wingtip,which increases the lift force. Also, the blended winglet reduces the power and magnitude of vorticities around the wingtip, which reduces the wing's drag force. The effects of winglets on aerodynamic forces lead to a 3.8% increase in flight range and a 3.6% increase in the maximum payload of the aircraft. Also, the acoustic power level variables on the surfaces and fields around the wing have been investigated integrally and locally.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2008년도 춘계 학술발표회 제20권1호
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• pp.1041-1044
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• 2008

The addition of chemical inert filler in blended cement, such as limestone or chemical inert silica fume, will produce a physical effect on cement hydration. Due to the high surface area of inert filler in the mixtures, it provides sites for the nucleation and growth of hydration products, thus improving the hydration rate of cement compounds and consequently increasing the strength at early age. This paper proposes a model of hydration of Portland cement blended with chemical inert filler. This model considers the influence of water to cement ratio, cement particle size, cement composition and addition of chemical inert filler on hydration. The heat evolution, degree of hydration and porosity are obtained as accompanied results in hydration process. The prediction results agree well with experiment results.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2012년도 추계학술대회
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• pp.334-337
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• 2012

우리나라 고령층 정보화 교육은 1999년부터 시작되어 왔다. 그러나 현재까지도 정보화 수준은 기초적인 수준을 벗어나지 못하고 있는 실정이다. 문제점으로는 정보화 교육이란 다른 일반적인 교육과 달리 고령층에게는 일반적인 교육 방법으로는 높은 수준을 기대하기가 어렵다. 따라서 본 논문에서는 현행의 문제점을 파악하고 학습자와 교수자간에 연계할 수 있는 학습방법과 Blended Learning을 고령층 정보화교육에 접목시켜 변화 해 온 8여년간 고령층 정보화 교육의 수준 향샹된 연구 결과를 나타내보기로 한다.

• 한국간호교육학회지
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• 제19권1호
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• pp.16-23
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• 2013

Purpose: The purpose of this study was to examine the effects of intrinsic motivation and e-learning strategies on nursing students' learning satisfaction in blended e-learning environment. Method: The survey was performed with 111 undergraduate nursing students who have taken community health nursing in 1 university. The data was collected by questionnaires and were analyzed with the IBM SPSS statistics 20.0, using descriptive statistics, Pearson's correlation coefficient and multiple regression. Results: The mean score for intrinsic motivation was 3.25, for e-learning strategies, 3.56, and for learning satisfaction, 3.69. Significant positive correlation among intrinsic motivation, e-learning strategies, and learning satisfaction. The regression model explained 41.4% of learning satisfaction. Both intrinsic motivation and e-learning strategies were significant predictor of learning satisfaction. Conclusion: In order to improve the learners' learning achievement and learning satisfaction in blended e-learning environment, intrinsic motivation should be strengthen and e-learning strategies should be developed.

• 동서간호학연구지
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• 제16권2호
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• pp.96-104
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• 2010

Purpose: This research is a case study on a problem-based learning (PBL) model with blended learning in a nursing college. Methods: The target students were nursing sophomores in a nursing college who agreed to participate in a blended learning course and to be subjects in this study for 15 weeks. The questionnaires developed by Baek (2003) and Lee (2007) were modified and applied to collect data. Results: The students' satisfaction with the blending learning was the highest in the item "Online community activities were helpful in enhancing knowledge." The level of satisfaction with PBL was the highest in the item "It was helpful to listen my classmates' opinions rather than thinking all by myself." Conclusion: This study is suggestive that blended learning is effective to improve learning satisfaction by reinforcing practicality of face-to-face study to online learning. Various learning methods based on students' demands and preferences should be applied in nursing education.

• Computers and Concrete
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• 제20권2호
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• pp.247-255
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• 2017

This study aimed to develop a Rule Based Mamdani Type Fuzzy Logic (RBMFL) model to predict the flexural strengths and compressive strengths of blended cements under elevated temperatures. Clinoptilolite was used as cement substitution material in the experimental stage. Substitution ratios in the cement mortar mix designs were selected as 0% (reference), 5%, 10%, 15% and 20%. The data used in the modeling process were obtained experimentally, after mortar specimens having reached the age of 90 days and exposed to $300^{\circ}C$, $400^{\circ}C$, $500^{\circ}C$ temperatures for 3 hours. In the RBMFL model, temperature ($C^{\circ}$) and substitution ratio of clinoptilolite (%) were inputs while the compressive strengths and flexural strengths of mortars were outputs. Results were compared by using some statistical methods. Statistical comparison results showed that rule based Mamdani type fuzzy logic can be an alternative approach for the evaluation of the mechanical properties of concrete under elevated temperature.

• 수산해양교육연구
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• 제28권3호
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• pp.872-880
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• 2016

The purpose of this study is to find the research trends relating to flipped learning through keyword network analysis. For investigating this topic, final 100 papers (removed due to overlap in all 205 papers) were selected as subjects from the result of research databases such as RISS, DBPIA, and KISS. After keyword extraction, coding, and data cleaning, we made a 2-mode network with final 202 keywords. In order to find out the research trends, frequency analysis, social network structural property analysis based on co-keyword network modeling, and social network centrality analysis were used. Followings were the results of the research: (a) Achievement, writing, blended learning, teaching and learning model, learner centered education, cooperative leaning, and learning motivation, and self-regulated learning were found to be the most common keywords except flipped learning. (b) Density was .088, and geodesic distance was 3.150 based on keyword network type 2. (c) Teaching and learning model, blended learning, and satisfaction were centrally located and closed related to other keywords. Satisfaction, teaching and learning model blended learning, motivation, writing, communication, and achievement were playing an intermediary role among other keywords.