• East Asian mathematical journal
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• v.26 no.2
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• pp.115-140
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• 2010

The purpose of this paper was to develop manipulative materials to teach the angle concepts and construct a teaching-learning program by using that. Furthermore, this study analyzed how does the program affect students understanding of the angle concepts. To check the effects of learning activities with manipulative materials on the understanding of an angle concepts, applied observation during class and write a mathematics journal writing, a description of students impressions at the end of the class and analyzed before and after test paper. We find that students approached the subject more friendly and knew well about the mathematical concepts by using materials. Furthermore, this activity helped that way to solve add and subtract of the angle, estimate ability, round angle concept, positive response in mathematics learning.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2012.05a
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• pp.25-27
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• 2012

The domestic construction industry recognize that review of design and construct-ability has the devastating effects. The way to take advantage of BIM for increase the possibility of discovered the design errors in advance are being discussed a lot recently. Since 2012, Public procurement published that the Turn-key project which is the more than 50 billion won in construction have to let the BIM-based design be mandatory. However, people expected the advent of BIM technology can resolve the existing design errors. But the situation is the connection of design stage and construction stage is very insufficient in domestic. Therefore, in this study understanding the types of design errors in construction phase. according the review of design errors before construction. Then can acceleration the application of BIM to improve the workability in a construction site.

• School Mathematics
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• v.13 no.1
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• pp.19-36
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• 2011

This study provides middle school students with an opportunity to construct elementary functions with dynamic geometry based on the proportion between lengths of triangle to activate students' intuition in handling elementary algebraic functions and their geometric properties. In addition, this study emphasizes the process of justification about the choice of students' construction method to improve students' deductive reasoning ability. As a result of the pilot lesson study, this paper shows the characteristics of the students' construction process of elementary functions and the roles the teacher plays in the process.

• Journal of Educational Research in Mathematics
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• v.9 no.1
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• pp.295-309
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• 1999

The primary purpose of this study is to investigate problems with the current mathematics textbook. According to a survey, the following were the findings: Textbook is only a tool-book for introducing mathematical facts. It is a unique book for all students possessing different level of mathematical ability. There is difficulty in teaming math using technological devices and in activating(mental and concrete) manipulative activities. There is difficulty in communicating while doing mathematics. There is lack of defined and developed layout of textbook, et. al. It can be however found that these problems can be solved to some degrees, when mathematics textbook is developed based on constructivism. Recently, in mathematics education, it has been gradually emphasized that constructivism can be powerful in teaching and learning mathematics. There are however some difficulties in developing mathematics textbooks to reflect constructivism, such as to fill the gap between the contents written in the national curriculum determined in advance and the contents which students construct psychologically or socially in mathematics class.

• Proceedings of the KIEE Conference
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• 2000.07d
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• pp.2327-2329
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• 2000

This paper addresses the use of a nonlinear modeling procedure which construct a wavelet-based fuzzy model using genetic algorithm. A fuzzy inference system has the functional equivalence with a wavelet transform. Therefore, a wavelet-based fuzzy model using GA inherits the advantage of wavelet transform. Hereby, its performance is promoted. By help of the ability of GA to search the optimum globally, parameters of wavelet transform is determined closely to the optimal point. The feasibility of the proposed fuzzy model is proved by modelling a highly nonlinear function and comparing it with previous research.

• The Journal of Sustainable Design and Educational Environment Research
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• v.11 no.3
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• pp.46-54
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• 2012

The accuracy of cost estimation at an early stage in school building project is one of the critical factors for successful completion. So various of techniques are developed to predict the construction cost accurately and expeditely. Among the techniques, Support Vector Machine(SVM) has an excellent ability for generalization performance. Therefore, the purpose of this study is to construct the prediction model for construction cost of educational building project using support vector machine technique. And to verify the accuracy of prediction model for construction cost. The performance data used in this study are 217 school building project cost which have been completed from 2004 to 2007 in Gyeonggi-Do, Korea. The result shows that average error rate was 7.48% for SVM prediction model. So using SVM model on predicting construction cost of educational building project will be a considerably effective way at the early project stage.

• Journal of Agricultural Extension & Community Development
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• v.3 no.2
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• pp.265-271
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• 1996

Locals of Control is considered one of the main imporment factors on responsible environmental behaviors(REB). It is defined as an individual's perception of his or ha ability to bring about change through his a her behavior. This psychological construct is divided in two, external and internal. Internal locus of control(ILOC) is imporment as predictor for responsible environmental behaviors. This study was conducted to investigate the Locus of Control and relations with REB in Undergraduate Students. The data were collected mainly through questionnaires and a total of 157 responded questionnaires was analyzed for the study. The statistical methods used in this study were frequency, percentile and correlation. The major findings of this study were (1) Most of undergraduate students had internal locus of control(75.2%). (2) According to region, rural students showed high levels in ILOC and REB.

• Korean Journal of Child Studies
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• v.18 no.2
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• pp.19-32
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• 1997

This study explored an alternative activity for the assessment of young children's literacy in Korea; namely, the evaluation of children's ability to construct meaning independent of decoding skill. The subjects were 78 children 4 to 5 years of age in Seoul. Instruments were the researcher's revised form of the Story Construction from a Picture Book, TRSR (Teachers' Ratings of Students' Reading) designed by van Kraayenoord & Paris (1996), and the revised form of the WLAT (Written Language Awareness Test, Kim, 1995). The assessment scores and oral responses of the children were analyzed by Pearson's r, MANOVA and one-way ANOVA, using repeated measures. The findings showed that (1) the story construction total scores were significantly correlated with WALT scores and the subcategory scores were intercorrelated with each other. (2) The story construction total scores differed by age, and (3) the 2 phase scores were higher than the 1 phase scores.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.20 no.43
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• pp.393-408
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• 1997

In the early 1990s, as Korean automobile industry has made rapid progress due to favorable trend in domestic demand and steady increase of export it is very important to analyze the extents of competitiveness and the trends of change in the field of production. In this dissertation, the current situation of our competitiveness and its changes in the field of production are synthetically reviewed through examining productivity and quality, that is output, as well as other overall factors related in the process of production. And this analysis reassures that first of all, our prior tasks lie in the quality and volume of production, and we should develope competitiveness through multilateral innovation of management Now in order to meet these prior tasks, we must secure our own technology design and ability for innovaton ; enlarge overseas local production technical tie-up with leading companies and develop M&A for globalization ; improve price competitiveness, construct cooperation of labor and capital, and improve the structure of finance for innovation of management saving the cost ; establish the new method of production for the preparation of increasing overseas investment in near future.

• Research in Mathematical Education
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• v.12 no.3
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• pp.215-233
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• 2008

Deep comprehension of basic mathematical notions and concepts is a basic condition of a successful teaching. Some elements of algebraic thinking belong to the elementary school mathematics. The question "What stays the same and what changes?" link arithmetic problems with algebraic conception of variable. We have studied beliefs and comprehensions of future elementary school mathematics teachers on early algebra. Pre-service teachers from three academic pedagogical colleges deal with mathematical problems from the pre-algebra point of view, with the emphasis on changes and invariants. The idea is that the intensive use of non-formal algebra may help learners to construct a better understanding of fundamental ideas of arithmetic on the strong basis of algebraic thinking. In this article the study concerning arithmetic series is described. Considerable number of pre-service teachers moved from formulas to deep comprehension of the subject. Additionally, there are indications of ability to apply the conception of change and invariance in other mathematical and didactical contexts.