• Journal of Elementary Mathematics Education in Korea
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• v.4 no.1
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• pp.1-19
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• 2000

This paper aims to enhance students' interest in the use of calculators in mathematics education and promote their use of calculators in real-life situations. Towards these ends, problem types and instructional models developed for the efficient utilization of calculators. The instructional models focus on teaching mathematics relying on the path through which expert teachers have gone through to gain relevant knowledge. By developing problem types and instructional models suitable for calculator use, We can contribute to a better attainment of instructional goals in mathematics education. The instructional models and problem types will aid teachers in making decisions about instructional development plan and basic features of instructional activities. The use of a new medium will also lead to increased interest and confidence in learning, thus contributing to the enhancement of students' ego.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.16 no.8
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• pp.1717-1724
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• 2012

Information of social relationship of users on online is useful information for other services such as recommend information of commercial activity. So, there is a lot of studies analysis with connection to visualization of social network. Most of the previous works of visualization focus on representing user's relationship on social network by a complex multi dimension graph. However, this method is difficult to identify the important of relationship to focus on personal user intuitively. In order to resolve above problem, this paper proposes a new visualization method using the user's correlation and user relationship of network node. The proposed method visualizes the hierarchy relationship of users using the internal relation of network reflecting user's message and external relation of network nodes.

• Journal of the Institute of Electronics Engineers of Korea SC
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• v.46 no.3
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• pp.36-43
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• 2009

Electrocardiogram (ECG) is a graphical record of the voltages generated during the heart beats, and is very useful in observing the status of the heart of the human or animals. In this paper, an ECG monitoring system is developed for the small animals, such as the rat. This system is very useful in monitoring the side effect of drugs. Since small animals have faster heart rate than the human case, the monitoring system has a faster sampling frequency and processing speed. Furthermore, for a realtime monitoring of the small moving animals, the system is composed of a small wireless ECG module, which is based on the IEEE 802.121.4 wireless physical layer. The developed wireless ECG system can successfully monitor the ECG of small animals, such as the rat.

• Journal of Korean Home Economics Education Association
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• v.22 no.4
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• pp.1-13
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• 2010

The purpose of this study was to examine how the basic directions proposed in the Dietary Education Support Act were reflected in the dietary section of home economics textbooks for middle schools. The eleven different kinds of the 2007 revised textbooks were considered in the study. It was found that all of the textbooks considered reflected well in general the basic directions in the Dietary Support Act - formation of healthy dietary habits, promotion of dietary activities, practice of green dietary, preservation of traditional dietary, utilization of local food products, etc. in terms of their organization and description. However, it was also revealed that there were great differences among them in their treatment of visual materials like figures, photos, graphs, etc., news articles, and interesting anecdotal stories.

• Journal of the Korean School Mathematics Society
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• v.8 no.3
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• pp.357-366
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• 2005

This Study suggests some ideas how we develop a network of content structure based on informal context and method how we decide a sequence of mathematical syllabus from those Structures. 10th grade students in the process conceptual development was observed and interviewed in 2 hour teaching and learning experiment. Three related characteristics of student's thought in structuring math. Content and sequencing it were investigated as follows : (a) the reasoning that they do reflective abstraction well(or do not well) in acquisition of conceptual knowledge. (b) the method that teacher can use resuits in (a) to organize the content structure. (c) the ways that teacher find the process knowledge in informal content structure. That is, this study investigated the way we, curriculum designer, can create well defined content structure and instructional sequence strongly based on the learners' understanding.

• School Mathematics
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• v.16 no.1
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• pp.83-110
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• 2014

This study analyzed the mathematics textbooks of middle grades in the first Korean curriculum, based on the modern trends of mathematics education curriculum, comparing with present Korean curriculum's other textbooks and the American textbook, MiC. The mathematics textbooks in the first Korean curriculum are based on various situations in our real life and introduce mathematical concepts throughout a set of mathematics problems. The textbooks present mathematical concepts with connected knowledge and include mathematical activities which make students use mathematical table, graph and formula at the same time. And students are actively required to discuss together during the mathematics problem solving process. As the results of this modern review on Korean 1st curriculum and middle grades mathematics textbooks, it would provide preliminary data and meaningful implications for the next curriculum and concomitant instructional materials.

• School Mathematics
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• v.19 no.4
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• pp.691-712
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• 2017

It is an important to develop teachers' statistical reasoning or thinking by teacher education. In this study, the "comparing two data sets" tasks is focused as a way to develop pre-service elementary teachers' reasoning about core ideas of statistics such as distribution, variability, center, and spread. 6 teams of each 4 pre-service elementary teachers participated on the tasks and their presentations are analyzed based on Pfannkuch's (2006) teachers' inference model in comparing two data sets. As a result, they paid attention to the distribution and variability in the statistical problem solving by the "comparing two data sets" tasks, and used their contextual knowledge to make a statistical decision. In addition, they used some statistics and graphs as the reference for statistical communication, which is expected to provide implications for improving statistical education. The finding implies that the "comparing two data sets" tasks can be used to develop statistical reasoning of pre-service elementary teachers. Some recommendations are suggested for teacher education by these tasks.

• Communications of Mathematical Education
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• v.35 no.3
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• pp.323-340
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• 2021

The purpose of this case study is to explore the similarities revealed in the process of solving and generalizing word problems related to systems of linear equations in two variables according to covariational reasoning. As a result, student S, who reasoned with coordination of value level, had a static image of the quantities given in the situation. student D, who reasoned with smooth continuous covariation level, had a dynamic image of the quantities in the problem situation and constructed an invariant relationship between the quantities. The results of this study suggest that the activity that constructs the relationship between the quantities in solving word problems helps to strengthen the mathematical problem solving ability, and that teaching methods should be prepared to strengthen students' covariational reasoning in algebra learning.

• Journal of the Korea Society of Computer and Information
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• v.8 no.2
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• pp.51-56
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• 2003

The structuring of Web information supports a strong user side viewpoint that a user wants his/her own needs on snooping a specific Web site. Not only the depth first algorithm or the breadth-first algorithm, but also the Web information is abstracted to a hierarchical structure. A prototype system is suggested in order to visualize and to represent a semantic significance. As a motivating example, the Web test site is suggested and analyzed with respect to several keywords. As a future research, the Web site model should be extended to the whole WWW and an accurate assessment function needs to be devised by which several suggested models should be evaluated.

• Journal of the Korean Society of Food Science and Nutrition
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• v.26 no.4
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• pp.726-732
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• 1997

The purpose of this study is to develop a software program to diagnose and assess status of dietary intake obtained using 24-hour dietary recall method. This program consist of four functions. The first function is assessing tile general status of the body such as ideal body weight, obesity measure, activity expenditure energy and total energy requirement by the analysis of age, height, weight and the degree of activity. The second one is calculating the intake number of food classified by the food group and evaluating the status of food intake by comparing them with the number of standardized intake in recommended dietary allowances for Koreans,6th revision. Third one is calculating energy and nutrient intakes contributed by the food group in dietary intake and evaluating the status of dietary intake by comparing the nutrient intake with the recommended dietary allowance for Korean, especially calculating and evaluating the status of dietary fat intake. The fourth function is calculating and evaluating the status of nutrient intake and nutrients energy Percent contributed by three regular meals and at least one in-between-meal snack. The results are displayed as tabular forms and graphical forms on the computer screen.