• Journal of Educational Research in Mathematics
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• v.20 no.3
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• pp.305-322
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• 2010

The epistemological obstacles in the area learning of plane figure can be categorized into two types that is closely related to an attribute of measurement and is strongly connected with unit square. First, reasons for the obstacle related to an attribute of measurement are that 'area' is in conflict. with 'length' and the definition of 'plane figure' is not accordance with that of 'measurement'. Second, the causes of epistemological obstacles related to unit square are that unit square is not a basic unit to students and students have little understanding of the conception of the two dimensions. Thus, To overcome the obstacle related to an attribute of measurement, students must be able to distinguish between 'area' and 'length' through a variety of measurement activities. And, the definition of area needs to be redefined with the conception of measurement. Also, the textbook should make it possible to help students to induce the formula with the conception of 'array' and facilitate the application of formula in an integrated way. Meanwhile, To overcome obstacles related to unit square, authentic subject matter of real life and the various shapes of area need to be introduced in order for students to practice sufficient activities of each measure stage. Furthermore, teachers should seek for the pedagogical ways such as concrete manipulable activities to help them to grasp the continuous feature of the conception of area. Finally, it must be study on epistemological obstacles for good understanding. As present the cause and the teaching implication of epistemological obstacles through the research of epistemological obstacles, it must be solved.

• Journal of Fisheries and Marine Sciences Education
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• v.24 no.3
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• pp.446-458
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• 2012

This research aims to analyze on the instruction effectiveness of ability grouping based on 'setting' and the result is as following. Superior group had a positive effect from the aspect of self-conception, satisfaction on class, and learning attitude while average and inferior group had a negative effect from the aspect of self-conception, satisfaction on class, and learning attitude. Therefore, the point seems to be that ability-grouping class based on 'setting' only helps the students in the superior group. Therefore, it is necessary to reconsider the educational policy of variable curriculum classroom by achievement Level implemented by current ability-grouping. A method should be prepared to help all the students in superior, average, and inferior level.

• Journal of The Korean Association For Science Education
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• v.19 no.4
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• pp.516-527
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• 1999

The purpose of this study was to find out the responses of students confronted with discrepant situation about inertia concept. We had developed two discrepant situation patterns according to conceptual change model(Kwon, 1989). And we examined the students' responses to the discrepant situations of the 3 inertia problems by interview method. In the result of this study. many students in discrepant situation 1 failed to explain the situation Some students gave up their preconception and showed new conception that was different from preconception. But most of their new conceptions were not scientific conception. In discrepant situation 2. the major characteristics of students responses were the assimilation strategies. Many students modified their preconception in some part but didn't change it. After discrepant situation. students' conceptions were changed more diverse conceptions than preconceptions.

• Journal of The Korean Association For Science Education
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• v.27 no.1
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• pp.28-36
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• 2007

This study investigated the influences of small group discussion and students' visual learning style in learning chemical concepts with drawing and writing as methods to assist students in connecting and integrating multiple external representations. Seventh graders (N=449) at a coed middle school were assigned to individual drawing (ID), pair drawing (PD), individual writing (IW), and pair writing (PW) groups. All students learned "Boyle's Law" and "Charles's Law" for two class periods. Analyses of the results revealed that the students in the PD group, regardless of students' visual learning style, scored significantly higher than those in the ID group in a conception test. The scores of the students with strong visual learning preference in the PW group were significantly higher than those in the IW group in the conception test, while the scores of the students with weak visual learning preference were not significantly different between the two groups. Although the conception test scores of the PD group were higher than those of the PW group, the difference was relatively small. It was found that most students in both PD and PW groups perceived pair drawing and pair writing positively upon cognitive and motivational aspects.

• Journal of The Korean Association For Science Education
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• v.20 no.4
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• pp.634-641
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• 2000

The degree of cognitive conflict, conceptual change, and the retention of conception in studying 'the cause of rising water at burning a candle in a bottle' with anomalous data were compared by age and gender. According to 'change of belief in initial theory', 7 types of responses to anomalous data were ordered by 4 levels. In comparing the results by age, producing cognitive conflict by anomalous data, conceptual change, and the retention of conception were found to be more effective for older students than younger students. However, the degree of cognitive conflict was not significantly correlated with the conception and retention tests scores. The results of Mann-Whitney U test revealed that there were no significant differences by gender in the degree of cognitive conflict, conceptual change, and the retention of conception.

• Education of Primary School Mathematics
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• v.14 no.2
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• pp.147-164
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• 2011

The national mathematics curriculum revised in 2007 emphasized students' mathematical communication and the curriculum is currently applied to all grades. In order to promote students' mathematical communication, the teacher needs to understand full implications and apply them to instruction. This study examined how teachers employed mathematical communication in their instruction and how they perceived it. The results showed that teachers had lack of understanding of student-centered instruction and mathematical communication. They also did not use various representation activities and discussion-based activities as expected. The number of students per classroom was reported by teachers as a main barrier to promote mathematical communication, but it did not make substantial differences in practice. Building on the results, this paper included implications for improving teachers' conception of mathematical communication.

• Research in Community and Public Health Nursing
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• v.12 no.1
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• pp.142-149
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• 2001

The health education for elementary school students is a very important factor in the development of adult health practices. Particularly, eyesight is difficult to recover if lost. Therefore, prevention is better than cure. This study was conducted to investigate the factors that affect the visual health behavior of elementary school students and to furnish basic materials and directions for the promotion of elementary school health. The investigation was carried out for 4 days from 9. 18. 2000 to 9. 21. 2000 for 199 children in 3 elementary schools. A questionnaire was composed of 3 questions about general property. 20 questions about visual health behavior. 7 questions about visual self-efficacy. 5 questions about visual motivation. 16 questions about self-conception. 20 questions about the health locus of control. The data was analysed by an SAS program for t-test. ANOVA. correlation, and multiple regression tests. The results are as follows. 1. The visual health behavior of elementary school children was good (average 52.53). 2. For visual health behavior, school, year, and sex were influential factors. economic levels were not. 3. Visual health behavior had a significant correlation with visual self-efficacy, visual health motives and self-conception. but not with the locus of control. 4. In the multiple regression test, visual self-efficacy and self-conception were significant prediction factors -- the suitability of the regression model was 30.8%. Suggestions from the results are as follows: First, school year and sex had a significant influence on visual health behavior: therefore, it is necessary to consider these two factors when education programs are developed. Second, this study was carried out for students in a partial area only. Therefore, repeated studies for a large sample are necessary for the future.

• Journal of The Korean Association For Science Education
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• v.26 no.7
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• pp.805-812
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• 2006

In this study the description patterns of chemistry textbooks on the boiling point elevation phenomenon and the understanding patterns of high school students, pre-service teachers and chemistry teachers were investigated. High school chemistry II textbooks developed in the 6th and 7th national curricula were analyzed and the conception patterns of subjects on this phenomenon were categorized using a questionnaire developed for this study. The description patterns of science textbooks were classified into three: 'decreasing of surface solvent molecules', 'attraction force between solvent and solute molecules' and 'decreasing of surface solvent molecules and attraction force between solvent and solute molecules'. In the result of the conception analysis, the ratio of 'attraction force between solvent and solute molecules' was high among students, pre-service teachers, and chemistry teachers. There was a propensity that they would like to explain the boiling point elevation in terms of enthalpy rather than entropy, and in order to analyze this propensity, follow-up interviews were carried out.

• Journal of Science Education
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• v.37 no.3
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• pp.434-445
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• 2013

The purpose of this study is to aid the teaching strategy for the teacher by investigating the preconception of the earthquake for 4th grade students in elementary school before learn the curriculum. For this, 31 grade students who lived in Seongnam in Gyeonggi province were interviewed with the questionnaire. The following is the findings. On the definition of an earthquake, 64.9% of the students had scientific conception. On the question of 'what happens on the ground when there is an earthquake', 59.2% of the students responded shaking or cracking of the earth, ground, things or building. On the question of 'what a person should do when there is an earthquake', most of the students responded by more than two answers. In contrast, on the causes of an earthquake, there were the largest percentage (35.3%) students who answered they didn't know. Except for one student, there were no students had talked about scientific conception. On the question of 'what happens below when there is an earthquake', 26.3% of the students responded they didn't know. On the place where an earthquake occurs rather frequently, 22.2% of the students mentioned an island. On the reason, 39.9% of the students responded they didn't know and there were no students with scientific answers. This study showed 4th grade students had scientific conception on the definition of an earthquake, and they had many experience interaction with external environment on 'what happens on the ground when there is an earthquake', 'the place where an earthquake occur rather frequently'. However the students had relatively small experience on the causes of an earthquake, on 'what happens below the ground when there is an earthquake', and earthquake-prone areas. Based on this study, additional research must be conducted on science in which the students' preconceptions is investigated to connect back to curriculum development. In addition, consideration must be given on how to integrate the thinking processes of students during the curriculum development process.

• Journal of the Korean earth science society
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• v.23 no.2
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• pp.132-139
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• 2002

One of the prime objectives of school science is to help the children learn science concepts and conceptual schemes that will help them understand and interpret their environment. One of the basic scientific concepts is 'Change -everything existing in universe is changing always'. The purpose of this study was to investigate the characteristics of elementary and secondary students' conception of change. The subjects for this study were 489 students in Korea; 111 fourth graders, 95 sixth graders, 140 seventh graders and 143 ninth graders. Four items - mountain, river, ground, sea -were used for investigating students conception of change because representing the nature world in elementary and secondary level. The subjects were asked to check whether each item was changing and to explain each their check. Students' explanations were classified by whether they were sound understanding geologically, or not. The rate of responses that each item was changing was compared by grades and the rate of geological explanations was also compared by grades. Because students' conceptions of change might were effected by time scale, the additional questions that asked students whether the present status of four items were equivalent to the that of several points of time. As a result, the rate of scientific answers and patterns of explanations were similar by grade and the rate of geological understandings was relatively low. The frequencies of concept of change were more dropped as the point of time was closer to present.