• Journal of Korea Society of Digital Industry and Information Management
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• v.5 no.1
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• pp.127-139
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• 2009

Recently a rapid development of Information Technology including Internet have brought new way of education such as Distance education, Cyber University, Home Schooling and so on. This change of education have also brought about the change of a tool and medium for education. It is a using multimedia contents in education. Using the multimedia learning contents on line education is considered as one of new way of education and expected to bring learner's better performance. Therefore, it's necessary to research online education contents and its design. In this paper, we discussed how the multimedia contents should be designed to help to reinforce what the learner have learned and researched a critical factor of online contents to effect on learner's better performance.

• Journal of Korea Society of Industrial Information Systems
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• v.13 no.2
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• pp.69-79
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• 2008

Due to popularization of the wireless Internet and mobile devices the infrastructure of the ubiquitous environment, where users can get information whatever they want anytime and anywhere, is created. Therefore, a variety of fields including the education studies methods for efficiency of information transmission using on-line and off-line contents. In this paper, we propose the Mixed Mobile Education system(MME) that improves educational efficiency using on-line and off-line contents on mobile devices. Because it is hard to input new data and cannot use similar off-line contents in systems used additional tags, the proposed system does not use additional tags but recognizes of-line contents as we extract feature points in the input image using the mobile camera. We use the Scale Invariant Feature Transform(SIFT) algorithm to extract feature points which are not affected by noise, color distortion, size and rotation in the input image captured by the low resolution camera. And we use the client-server architecture for solving the limited storage size of the mobile devices and for easily registration and modification of data. Experimental results show that compared with previous work, the proposed system has some advantages and disadvantages and that the proposed system has good efficiency on various environments.

• The Mathematical Education
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• v.63 no.3
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• pp.451-466
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• 2024

This study investigated elementary preservice teachers' conceptions of a generating line, an ambiguous concept in school mathematics. The preservice teachers' conceptions of a generating line can be classified into four types: (a) only cones have generating lines, (b) only cones and cylinders have generating lines, (c) solids of revolution have generating lines, (d) straight lines on the lateral surface are generating lines. 22.1% of all preservice teachers believed that only cones have generating lines, and most of them followed the definition of a generating line presented in elementary mathematics textbooks. The conception that only cones and cylinders have generating lines was the least investigated. However, since there were instances where generating lines were defined with the use of a director curve, it became important to explore topics more thoroughly, such as generating lines of a truncated cone. 27.9% of all preservice teachers believed that solids of revolution have generating lines. This conception was marked by differing opinions on whether spheres also have generating lines. The conception that straight lines on the lateral surface are generating lines was the most frequently investigated. This conception differs from the traditional view in school mathematics because it suggests using a director curve to define generating lines. Based on these analysis results, the researcher developed specific teaching methods that considered both subject matter knowledge and pedagogical content knowledge for preservice teachers. In addition, the researcher proposed a consensus definition of a generating line in mathematics education.

• Journal of The Korean Association of Information Education
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• v.9 no.3
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• pp.473-482
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• 2005

We think that the class homepage can be solution for the problems in the cyber space or on-line community because students can practice activities in the on-line community, communicate with teachers or colleague, exchange opinions with parents and use it for learning. However, students would lose interest easily in the existing class homepage for lack of its immersion elements as compared with the commercial on-line communities. The class homepage needs to have immersion elements to reach its purpose. It is one of the solutions to use the avatars. Therefore, we studied on the influence of the avatars as the immersion of the elementary class homepage and the students cyber-self. As a result, we knew that the avatars can act enough as immersion element to achieve construction purpose of the class homepage and that use avatar helps in affirmative cyber self formation of elementary students.

• Journal of the Korea Fashion and Costume Design Association
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• v.11 no.2
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• pp.75-84
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• 2009

The following research analyzed the sewing teaching of the tailored jacket shown in fashion textbooks, which are currently used in universities and educational organizations in the fashion industry. To analyze the sewing teaching of tailored jackets, we analyzed 35 textbooks in the market. Among them we used 14 textbooks which dealt with the patter formation method of tailored jackets, and cutting and sewing methods. First, the stitching direction and the location of attachment varied. The type of sticking tape and its position also differed, emphasizing the need to make an institutionalized education material which is based on the characteristic of the fabric and its silhouette. Second, controlling the ease length of the right side sewing princess line, or information about the shoulder line and sleeve line of the notch as not specifically shown in the textbooks. Furthermore, not many textbooks showed how to pull the lower part of the texture out of sight, nor did they explain why this needed to be done. Third, the lining is usually slightly larger than the outer texture of the clothing, as the lining is usually tugged in the sewing process, and this method makes the clothes more comfortable. The method of sewing the princessline $0.2{\sim}0.3cm$ outside the outer pattern was the most recommended. The center-back side was usually 2cm in activity measurements, but it turned out that a textbook which required ease treatment on the shoulder line did not do so on the lining material. The textbooks used in this research dealt only with how to manufacture a tailored jacket without full explanation about textures which could influence the manufacturing. The production method and process differed between different textbooks, showing the need to make a institutionalized education material. In a quickly-changing era where there is rapid change in the dressmaking procedure, we need to help students understand the process more easily through a formalized education process.

• The Journal of Korean Association of Computer Education
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• v.19 no.6
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• pp.33-44
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• 2016

In this study, learning preferences of the informatics gifted participating in on-line programming practice has been investigated and the tutoring strategy based on learning styles was developed and verified its effectiveness. On-line programming learning is the environment in which learning is done through interaction with a tutor. For determination of the students' learning styles, Grasha-Reichmann's learning style was utilized. Key elements, learning activity and feedback, of tutoring strategy were derived based on learning style and developed on-line programming learning tutoring strategy. To verify the effectiveness, six-class period of learning C-language of 173 middle and high school students based on learning styles was applied for 12 weeks. As a result, the experiment group applied with a tutoring strategy based on the learning style showed significant improvements in terms of satisfaction and achievement than the control group.

• The Mathematical Education
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• v.50 no.1
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• pp.27-40
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• 2011

The purpose of this paper is to analyze and discuss the viewpoint dealing with the fundamental figures-point, line segment, and angle-of elementary school teachers. In fact, our main subjects in this article are as follows; how do elementary school teachers deal with the fundamental figures?, what is the general notion about the fundamental figures of elementary school teachers? Our such subjects come from the survey results about the 'fundamental figures in J. A. Ko(2009); the elementary school students have a tendency to regard the fundamental figures as not mathematical figures. In this article, we discuss mainly the meta-cognitive shift in the transform of notion, for example, from 'congruent' concept to 'equal' concept, about the fundamental figures.

• Animal Systematics, Evolution and Diversity
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• v.34 no.2
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• pp.96-100
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• 2018

One species of Euteliidae, Targalla delatrix ($Guen{\acute{e}}e$) and two species of Nolidae, Nola miyanoi Sasaki and Nola semiconfusa (Inoue) are reported for the first time in Korea. Targalla delatrix can be distinguished by the dark brownish forewings that show the transverse antemedial line, the costally rounded postmedial line and the bowl shaped marking on the costal part of subtermen and the dark brownish hindwings. Nola miyanoi can be distinguished by the whitish forewings that have the band-shaped central fascia with the blackish undulating antemedial line and the dark brownish undulating postmedial line and the whitish hindwings with a light blackish discal dot. Nola semiconfusa can be distinguished by the light grayish forewings that show deeply indented antemedial line, medially strongly projected and dentate postmedial line, a dark brownish subterminal line and a dark brownish termen, and the whitish hindwings with a light grayish discal dot. Adults and genitalia are illustrated and briefly described with their biological and distributional notes.

• Korean Journal of Optics and Photonics
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• v.13 no.5
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• pp.449-454
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• 2002

We have studied the effects of incoherent pumping on EIA at the transition between the $F_g=2$ ground state and the $F_e=3$ excited state in $^{85}Rb\;D_1$-line. Generally, the studies about EIA have been done in the cycling transition, where the population has no loss to other states. In the case of EIA by using the $^{85}Rb\;D_1$ transition line, the population is transferred to the other hyperfine state due to optical pumping. We incoherently pumped the atoms from $F_g=3\;to\;F_g=2$ with the pumping beam, which is resonant at the transition from $F_g=3\;to\;F_g=2$. We were able to observe the effects of incoherent pumping depending on the power and the polarization of the pumping beam.

• Journal of Science Education
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• v.34 no.1
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• pp.72-83
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• 2010

This study aims to analyze the types of arrows used on the inscriptions in the light unit of 7th grade science textbooks, and to investigate middle students' conceptions on the meaning of the arrows. The types of arrows in 9 science textbooks were analyzed. Based on this analysis, the instrument was developed to access how 7th graders perceive the meaning of arrows. In addition, we interviewed 7th graders, 2 students in high level, 2 in the middle, and 2 in low level by their achievement level, to investigate their perceptions on the meaning of the arrows. We analyzed 4 types of arrow by the process in which the reflected light from the object come into one's eyes. Students tend to perceive the meaning of the solid line and the dotted line of arrows differently according to their achievement level. When the light pathway is represented in which the reflected or refracted light enter into our eyes, it is necessary to describe and teach clearly both the meaning of solid line as the light from the object and the meaning of dotted line as the perception of the existence of the object.