• The Mathematical Education
• /
• v.57 no.3
• /
• pp.231-246
• /
• 2018

In this paper, we applied Sfard's reification theory to analyze the secondary students' level of conceptualization with regard to the formula of quadratic equation. Through the generation and development of mathematical concepts from a historical perspective, Sfard classified the formulation process into three stages of interiorization, condensation, and reification, and proposed levels of formulation. Based on this theory, we constructed a test tool reflecting the reversibility of the nature of manipulation of Piaget's theory as a criterion of content judgement in order to grasp students' conceptualization level of the formula of quadratic equation. By applying this tool, we analyzed the conceptualization level of the formula of quadratic equation of the $9^{th}$ and $10^{th}$ graders. The main results are as follows. First, approximately 45% of $9^{th}$ graders can not memorize the formula of quadratic equation, or even if they memorize, they do not have the ability of accurate calculation to apply for it. Second, high school curriculum requires for students to use the formula of the quadratic equation, but about 60% of $10^{th}$ graders have not reached at the level of reification that they can use the formula of quadratic equation. Third, as a result of imaginarily correcting the error of the previous concept, there was a change in the levels of $9^{th}$ graders, and there was no change in $10^{th}$ graders.

• School Mathematics
• /
• v.8 no.4
• /
• pp.417-439
• /
• 2006

Many studies indicate the emerging crisis of education of calculus even though the emphasis of calculus have been widely recognized. In our classrooms, the education of calculus also has been faced with its bounds. Most instructions of calculus is too much emphasis on the algebraic approach, thus students solve mathematical problems without truly understanding the underlying concept. The purpose of this study is to develop mathematization teaching and learning materials and methods in caculus based on the mathematization teaching and learning theories by Freudenthal and the variability principles of conceptual learning by Dienes, In order to this purpose, first, we analyzed the high school mathematics II textbook of 7th curriculum in Korea. Second, we developed mathematization teaching and learning materials and methods in highschool calculus. Consequently, the following conclusions have been drawn: we have reorganized and reconstructed the context problem in calculus based on concepts of tangent line and instantaneous rate of change.

• School Mathematics
• /
• v.18 no.1
• /
• pp.15-42
• /
• 2016

Clarifying differences of scholastic characteristics showed in male and female students is the first step for resolving the differences. It is difficult that we figure out them by one test. If we evaluate a few subjects, they can't have generality. So, we must evaluate lots of subjects through several years by all-around contents. We keep going on like that, we can get objective and valid results. Accordingly, I dealt with 2010~2014 NAEA taken by complete enumeration evaluation for elementary, middle, and high school students. From the evaluation, while I organized the achievement scores and the average of percentage of correct answers from aspects of whole test, item types, and content domains, I elicited from differences of scholastic characteristics showed in male and female students by achievement levels. On the basis of these, I explored ways which can resolve the differences in male and female students and I proposed several suggestions to look for the better ways.

• Journal of Gifted/Talented Education
• /
• v.19 no.3
• /
• pp.477-501
• /
• 2009

The Purpose of this study is to investigate the general trends of research on gifted education in Korea, by analyzing the articles published during the last thirty years. A total of 347 articles from 14 academic journals which are registered were yearly and synthetically analyzed. The articles were examined in terms of their topics, domains, and age and grade. The most widely researched topic was the cognitive characteristics of the gifted followed by curriculum and affective characteristics of the gifted. Studies on scientifically, generally and mathematically gifted students occupied 86% of total researches. Researches utilized elementary students as their subjects more than middle school or high school students. There is a lack of research on the problems that the gifted students face and on the assessment of gifted education institutes. Moreover, there is hardly any longitudinal study.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
• /
• 2015.10a
• /
• pp.95-97
• /
• 2015

Automatic Collision Prevention Training and RADAR Simulation Training, designated educations by the STCW Convention, are essential for officers to complete in order to board a ship. Recently, designated education institution standard based curriculum and requirements of the necessary facilities have been placed as a regulatory advisory requiring each institutions to match this and introduce equipment for simulation education, the FMSS(Full Mission Simulator System). Since the introduction of this research until today, a survey has been executed in order to find out the effect of utilizing the FMSS in ARPA/RADRA/Simulation Training for a period of 1 year. The result showed that 2.13times have been more effective. In addition, based on the results, identifying problems that occur during the education period and providing solutions to these problems have been proposed.

• Journal of Practical Engineering Education
• /
• v.7 no.2
• /
• pp.107-112
• /
• 2015

In this paper, it was investigated academic achievement whether any differences in accordance with the teaching methods in the materials processing section in 'technology and home economics' curricular. Target groups were compared to the eighth grade and ninth grade junior high school. Both eighth and ninth grade were selected for the first time learning the material processing section. The eighth grade was lessoned using the educational media, but the ninth grade was lessoned using writing. The results from the six questions, in one educational media utilization class got 71.1% correct answers, the other groups got 45.3% correct answers. The average percent correct differences between the two groups showed 25.8% points improvement in academic achievement.

• Journal of the Korean Institute of Educational Facilities
• /
• v.22 no.2
• /
• pp.3-13
• /
• 2015

The policy of the Ministry of education through the social awareness and issues are being changed. Accordingly, in response to the school building which also has to be changed. This study is Low-floor(1~2 floor) for high accessibility, important management and a lot of locomotion. This study is analysis by floor of newly established schools in Chungbuk. Facility and space on the possible low-floor situated are classified administrative zone, health zone, student support + local exchange zone, STEAM(creativity, personality) supporting zone. The administrative area includes administration office, principal's office and board rooms. The administrative zone is located against schoolyard. Because it is possible visual control of schoolyard. also it controls visitor access so it is placed near main entrance. Health zone is located near a special class, counseling center and wee class for emergency situation. and is located near schoolyard for visual control. Student support + local exchange area includes library and computer lab, audio-visual room, auditorium or gymnasium. It put more emphasis resident welfare, culture and education. So it opens for local residents. It is located center of few stories or near entrance. STEAM(creativity, personality) supports science lab, art room, family room. It is possible such a theory class, experience class and indoor and outdoor class. It is located few floors. This study is used as a reference for school building projects planing.

• Journal of Digital Convergence
• /
• v.11 no.11
• /
• pp.71-83
• /
• 2013

In a EFL situation, most Korean students and teachers are exclusively dependent on English textbooks to acquire the cultural factors of English. Therefore, it is necessary to analyze cultural elements in the English Textbooks. The results of the study are as follows: First, although all of the textbooks contain the culture part at the end of each lesson, it is insufficient for students to build a cultural schema. Second, in the analysis of cultural types, three types of cultures are presented in a similar percentage. Third, the culture elements were analyzed based on the 7th national curriculum revised in 2011. The most dominant is the culture regarding arts and literature. Forth, in nationality analysis, universal culture takes up the largest portion. Therefore, it is required more efforts to improve students' knowledge of the American and English culture.

• Journal of the Korean earth science society
• /
• v.30 no.4
• /
• pp.513-526
• /
• 2009

It has long been that the unit of oceanic salinity changed from permil (%o) to other unit. However, the middle-and high- school textbooks of science and earth science have still used %o as salinity unit that was defined a long time ago. The objectives of this study are to briefly discuss about the historical development of change in salinity unit and measurement techniques, to present differences between the salinity units of psu (practical salinity unit) and %o, and to address the need and validity for the correction of salinity unit in the textbooks. Twenty-seven kinds of textbooks based on the 7th National Curriculum were analyzed to investigate the expression of salinity unit and the definition of salinity. The results were compared with the usage of salinity units in the articles published in Journal of Korean Society of Oceanography from 1967 to 2008. The percentages by the use of %o were 96.3% in the text and 83.8% in the graphs or tables of the textbooks. By contrast, the scientific papers began to use psu from 1994 and then %o has seldom been used since 2004.

• Smart Media Journal
• /
• v.7 no.3
• /
• pp.51-56
• /
• 2018

Banana is the eighth most important crop in the world designated by the United Nations Food and Agriculture Organization (FAO). In terms of production, it is the fourth most harvested crop following wheat, rice, and corn, considered to be a promising food source for mankind as it is not only scrumptious but also rich in nutrients. However, abnormal cultivation methods that mankind has invented to breed bananas is currently pushing them to the state of extinction. The aim of this study is to develop information-rich digital contents that can easily and intriguingly convey information about steadily but certainly increasing risk of banana extinction. The end-users are middle and high school students who are assumed to be aware of the agricultural revolution through their school curriculum. The linear storytelling method was meant to encourage the end-users to be interested in the causes and processes in which banana has become endangered. For generating a natural interaction between the content and the end-users, a parallel, upper-lower structure was used, in which the relationship between the stories comprising several stages and the information graphic supporting each story is represented. This paper can support an information campaign about the endangered species.