• Educational Technology International
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• 제10권1호
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• pp.137-155
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• 2009

The purpose of this research is to develop Blended-TBL(Team Based Learning) model that emphasizes the active participation and teamwork of students in on-off blended learning environment, and apply it into the college course and explore whether self-regulated learning between one group pretest and posttest is different. For this, this research investigated the concept and the characteristics of Team Based Learning, and developed the Blended-TBL Model to apply it into the college course, and finally prove effects of Blended-TBL model on self-regulated learning using Motivated Strategies for Learning Questionnaire (MSLQ). The participants in this study were 57 college students. They participated in on-off blended-TBL course for 15weeks. Participants followed the content grounded and the problem solving steps in collaborative team-based learning. This research practiced a quantitative research to find out the statistical difference of the self-regulated learning between pretest and posttest using SPSS. The result revealed that Blended-TBL students improved self-regulated learning including motivation, cognitive, metacognitive, and resource management. Based on this result, this research discussed the effects of Blended-TBL on Self-Regulated Learning and suggested the further study.

• Educational Technology International
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• 제15권2호
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• pp.71-88
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• 2014

A variety of studies to predict students' performance have been conducted since educational data such as web-log files traced from Learning Management System (LMS) are increasingly used to analyze students' learning behaviors. However, it is still challenging to predict students' learning achievement in blended learning environment where online and offline learning are combined. In higher education, diverse cases of blended learning can be formed from simple use of LMS for administrative purposes to full usages of functions in LMS for online distance learning class. As a result, a generalized model to predict students' academic success does not fulfill diverse cases of blended learning. This study compares two blended learning classes with each prediction model. The first blended class which involves online discussion-based learning revealed a linear regression model, which explained 70% of the variance in total score through six variables including total log-in time, log-in frequencies, log-in regularities, visits on boards, visits on repositories, and the number of postings. However, the second case, a lecture-based class providing regular basis online lecture notes in Moodle show weaker results from the same linear regression model mainly due to non-linearity of variables. To investigate the non-linear relations between online activities and total score, RF (Random Forest) was utilized. The results indicate that there are different set of important variables for the two distinctive types of blended learning cases. Results suggest that the prediction models and data-mining technique should be based on the considerations of diverse pedagogical characteristics of blended learning classes.

• 대한공업교육학회지
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• 제30권1호
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• pp.19-36
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• 2005

The purpose of this study is to develop the Public Practice Center's teaching-learning model by applying blended learning strategies which is complementary to the expected problems such as expansion of the educational object and diversity of the curriculum to maximize the educational effect and to analyze activation types of the Practical Practice Center to expand the Public Practice Center's function and role by studying the document. Blended Learning Strategies are established in consideration of the following eight (8) factors ; learning environment, learning purpose, learning contents, learning time, learning place, learning type, learning media, type of interaction. It is redesigned and amended to the KEDI's individual confirmation instruction model for skill learning (1975) which is considered to be effective in the filed of education by applying features, educational contents of the Public Practice Center's teaching and merit of Blended Learning Strategies simultaneous. This model is composed of six (6) steps as shown below; 1. Understanding on the purpose and orientation 2. Observation for demonstration of fundamental skill 3. Ex on-line learning 4. Acquirement of element skill 5. Confirmation for acquirement of fundamental skill 6. After on-line learning. Further to this, this model is designed so that the above eight factors will be applied to the students effectively and the merit of e-learning and off-line practice will be mixed to the learner's expectation and satisfaction.

• Advances in concrete construction
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• 제7권3호
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• pp.167-174
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• 2019

Metakaolin (MK), which is increasingly being used to produce high performance concrete, is produced by calcining purified kaolinite between 650 and $700^{\circ}C$ in a rotary kiln. The carbonation resistance of metakaolin blended concrete is lower than that of control concrete. Hence, it is critical to consider carbonation durability for rationally using metakaolin in the concrete industry. This study presents microstructure modeling during the carbonation of metakaolin blended concrete. First, based on a blended hydration mo del, the amount of carbonatable substances and porosity are determined. Second, based on the chemical reactions between carbon dioxide and carbonatable substances, the reduction of concrete porosity due to carbonation is calculated. Furthermore, $CO_2$ diffusivity is evaluated considering the concrete composition and exposed environment. The carbonation depth of concrete is analyzed using a diffusion-based model. The proposed microstructure model takes into account the influences of concrete composition, concrete curing, and exposure condition on carbonation. The proposed model is useful as a predetermination tool for the evaluation of the carbonation service life of metakaolin blended concrete.

• Architectural research
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• 제20권1호
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• pp.27-34
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• 2018

To improve the chloride ingress resistance of concrete, slag is widely used as a mineral admixture in concrete industry. And currently, most of experimental investigations about non steady state diffusion tests of chloride penetration are started after four weeks standard curing of concrete. For slag blended concrete, during submerged chloride penetration tests periods, binder reaction proceeds continuously, and chloride diffusivity decreases. However, so far the dependence of chloride ingress on curing ages are not detailed considered. To address this disadvantage, this paper shows a numerical procedure to analyze simultaneously binder hydration reactions and chloride ion penetration process. First, using a slag blended cement hydration model, degree of reactions of binders, combined water, and capillary porosity of hardening blended concrete are determined. Second, the dependences of chloride diffusivity on capillary porosity of slag blended concrete are clarified. Third, by considering time dependent chloride diffusivity and surface chloride content, chloride penetration profiles in hardening concrete are calculated. The proposed prediction model is verified through chloride immersion penetration test results of concrete with different water to binder ratios and slag contents.

• Journal of the Korean Data and Information Science Society
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• 제17권2호
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• pp.543-557
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• 2006

This paper is concerned with the applicability of the chi-square approximation to the six disparity statistics: the Pearson chi-square, the generalized likelihood ratio, the power divergence, the blended weight chi-square, the blended weight Hellinger distance, and the negative exponential disparity statistic. Three dimensional contingency tables of small and moderate sample sizes are generated to be fitted to all possible hierarchical log-linear models: the completely independent model, the conditionally independent model, the partial association models, and the model with one variable independent of the other two. For models with direct solutions of expected cell counts, point estimates and confidence intervals of the 90 and 95 percentage points of six statistics are explored. For model without direct solutions, the empirical significant levels and the empirical powers of six statistics to test the significance of the three factor interaction are computed and compared.

• 한국학교수학회논문집
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• 제9권1호
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• pp.1-17
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• 2006

현재 학교수학이 추구하는 목표는 수학의 기본적인 지식과 기능을 습득하고 수학적으로 사고하는 능력을 길러 실생활의 여러 가지 문제를 합리적으로 해결할 수 있는 능력과 태도를 기르는 것이다. 이에 부합하기 위해서 본 연구는 협동학습 모델 중 개별화 학습프로그램이 큰 장점인 TAI 모델과 특별한 소집단 성적 산출로 인해 모든 소집단 구성원이 소집단 성공에 기여할 수 있다는 장점을 가지고 있는 STAD 모델을 혼합하여 새로운 모델을 제시하였다. 이 새로운 혼합모델을 학교 현장에 적용하여 학습자의 문제해결능력 및 정의적 영역에 있어서 어떤 영향을 주는지 알아보았다.

• 대한가정학회지
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• 제48권5호
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• pp.129-143
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• 2010

In order to improve the quality of student teachers' practicum, this study analysed the current situation of student teachers' field practice in child care centers. The study also assessed the practicum implementation case of H Cyber University. First, this research examined the characteristics of practicum implementation in universities. Second, a variety of strategies based on a blended model, on/off-line lectures, professor-student interaction, university-daycare centers collaboration, e-mentoring, and student teachers' portfolios that reduce the problems of student teachers' training, were explored. Finally, the practicum implementation case that adopted these factors was assessed. The results from this case study implied that student teachers' practicums based on a blended model can be an alternative method for problem-solving in existing student teachers' training in universities.

• 한국콘텐츠학회논문지
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• 제10권3호
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• pp.463-471
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• 2010

학습 본 연구의 목적은 블랜디드 러닝 환경에서 적용될 학업 성취 수준별 교수 학습 모형을 제안하는 것이다. 블랜디드 러닝 환경에 포함된 변인과 구조를 살펴보기 위해 웹 학습요소와 자기조절학습을 기초로 하여 두 종류의 설문지를 개발하였고, 또한 이를 적용한 반응을 근거로 하여 각 요소 간 위상과 경로를 표현하였다. 본 연구에서는 고등학생 154명을 실험 대상으로 2주간 사이버 학습을 실시하고 각 학습자의 성취 수준과 설문지 자료를 획득하였다. 또한 상관분석, 전통적 다차원척도법 그리고 중회귀분석을 적용하여 통계적 처리를 통해 각 요소 간 위상과 경로를 규명하고 블랜디드 러닝 모형을 정형화하였다.

• 컴퓨터교육학회논문지
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• 제12권5호
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• pp.49-62
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• 2009

평생교육기관의 역할을 수행하고 있는 방송통신고등학교의 특별활동은 제반 여건의 부족과 수업 연구에 대한 부족으로 사실상 운영되지 못하고 있는 실정이다. 이에 본 연구에서는 방송고 특별활동의 효과적인 운영 방안을 탐색하기 위하여 특별활동 온라인 콘텐츠를 방송고에 시범 적용하였으며, 그 결과 수업 운영에 필요한 시사점을 도출하였다. 이러한 시사점을 바탕으로 방송고 특별활동 운영에 필요한 5가지 Blended-Learning 영역을 선정하였으며, 이 중 방송고 특별활동에 맞는 교수 학습 방법과 전략을 블랜딩한 직접교수모형을 구안하였다. 따라서 이러한 연구 결과를 바탕으로 방송고 학생의 특수성과 특별활동 내용상의 특성을 반영한 방송고 특별활동 Blended-Learning 수업 모형을 개발하였다.