• Journal of Internet Computing and Services
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• v.17 no.3
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• pp.33-43
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• 2016

In this study, 3D-image based course material has been suggested as a potential pedagogical tool for laboratory courses for aviational maintenance in vocational high schools. With a special focus on assembly/disassembly of the combustion chamber, 3D contents described here are created by Soildworks 2014 based on the textbook widely used in aviational high schools. By analyzing several textbooks currently adopted at various schools, we have clearly shown that the current text-based teaching method is far from being effective regarding providing adequate learning environment for high school students who study aviational maintenance. From the analysis of the conventional textbooks, it is seen that it is urgent that we should come up with more effective and efficient way of teaching methods for these topics at vocational high schools. Using Solidworks, we have developed very vivid 3D image-based course material for topics related to a combustion chamber in the airplane. Newly developed 3D material is seen to clearly show step by step procedures of assembly and disassembly of the combustion chamber which has crucial importance in the aviational laboratory courses. Especially the transparent feature in Solidworks could make it possible to observe the parts covered by outer casing, which can not be seen even in any laboratory class with real objects. 3D animated views could provided unprecedented learning environment for students to acquire core knowledge with ease for the maintenance of a combustion chamber. In order to provide easy access for students to this 3D-based course material, the exclusive viewer is also developed using MS office powerpoint 2007. An example of a learning plan using 3d course material is suggested as well.

• Journal of the Korean Society for information Management
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• v.22 no.4 s.58
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• pp.153-172
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• 2005

The purpose of this study is to reveal how undergraduate students' computer literacy and library knowledge can affect their frequency of library material use and information literacy, and analyze the correlations between frequency of library material use and information literacy. Data were collected by distributing questionnaires to students of 7 universities in 8 credit-given user education courses, and correlations with variables were analyzed through hypothesis testing. It was suggested that with strong support of university administration, user education should be taught by using more of scholarly library material.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.30 no.10
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• pp.677-682
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• 2017

Lamination is used extensively in various industries. The type of lamination applied to the material depends on the precision level required, which varies for materials needed for everyday use, materials used in high-tech industries, and processes employed to fabricate finished products. Especially in hot lamination, the distribution of the surface temperature of the heating roller is very important to avoid the generation of internal bubbles and ensure flatness of the attached materials, and thus maintain a good standard of quality and productivity. In this study, we have developed a system to monitor the surface temperature of the heating rollerby applying a heterogeneous controller and a non - contact temperature sensor. This monitoring system accurately measures the surface temperature of the heating roller and applies the RS485 MODBUS communication method for easy expansion. Using this system, a laminated prototype was fabricated, and its efficacy for non-contact temperature sensor calibration, Ethernet IP communication, stoppage of the heating roller, and determination of temperature distribution with rotation was examined for its potential usage in industries.

• The Korean Journal of Community Living Science
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• v.18 no.2
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• pp.313-321
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• 2007

The study examined the level of understanding and satisfaction of parents who should receive the food materials and monitor the food service, and would provided the basic data for more desirable school feeding system. The analysis was based on the participation level in materials receiving and food service monitoring, condition of equipment, knowledge about materials and the opinions about monitoring education. 160 monitors out of Daejeon primary schools were used and 60% of them were in the age of thirties and the others were in forties. Equipment condition for material receiving was good and most of the monitors were familiar with the ways of using the machines. Difficulties of material receiving were found in meat(65.6%) and sea food(21.9%), and the ratios of activities and the intention to participate in monitoring education were high with 25.0% and 72.5% respectively. Most of the monitors thought sanitary conditions of food materials(100.0%) and delivery persons(96.9%) were very good or good. And 90% of the respondents changed their perception of school food service positive after monitoring. In conclusion, most of the parents wanted to participate in the monitoring and material receiving actively and showed great willingness to receive monitoring education.

• Journal of The Korean Association For Science Education
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• v.12 no.2
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• pp.1-18
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• 1992

The curriculum especially in Korea plays a crucial role in developing instructional materials. It serves as a criterion for selecting and organizing content of teaching materials. Therefore, the validity of a curriculum can be justified through testing effectiveness of an instructional material developed in accordance with the curriculum. This paper presents an instructional method and material developed based on the current tendency of educational thoughts that emphasize STS and students - centered teaching strategies in science education. The instructional material was organized around the concept and its subconcept of "nutrition" as presented in the high school biology textbooks now in use in the nation as well as in a few world-wide countries. It was also organized by the use of biological events and phenomena which high school students in rural areas can easily encounter through their everyday lives. The significant findings in this study are : ${\circ}$ The achievement levels in experimental groups were higher than one in controlled groups. ${\circ}$ The students as well as the teachers involved in this study showed positive attitude toward the instructional method developed in the process of this study. ${\circ}$ The greater part of the students among the controlled groups hoped that biology would be taught by this kind of teaching procedure and materials.

• Journal of the Semiconductor & Display Technology
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• v.11 no.2
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• pp.75-80
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• 2012

Polymer composites which have electrical properties have been studied in various industries. The Multi-walled carbon nanotube (MWCNT) are thought to be reinforcements for polymers because of their high aspect ratio and specially mechanical, thermal and electrical properties. We introduced MWCNT and impact modifier in order to improve thermal and mechanical properties of Polyphenylene sulfide (PPS) and give electric characteristic to PPS. The thermal properties were investigated by Differential scanning calorimeter (DSC) and Thermogravimetric analysis (TGA). The morphology, mechanical properties and electrical characteristic were performed by Field emission scanning electron microscopy (FE-SEM), Izod impact tester and surface resistance meter. As a result, we could find that the PPS/MWCNT composites have high conductivity and good mechanical properties than neat PPS resin.

• Elastomers and Composites
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• v.49 no.2
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• pp.160-166
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• 2014

The formulation of six basecoats was designed using aluminium pastes for the per-painted system in the automotive. The aluminium pastes contain pancake type metallic pigment, #501, #801, #601 and cornflake type metallic pigment, #750, #770, #790. The relative cure density of the basecoat increased in order of #501, #801, #601, #750, #770, #790. T-bending, impact resistance, and taping adhesion showed increment with increasing cure density. In the appearance( combined factor) test on cornflake type pigment, The basecoat including the smallest particle size pigment, #790 resulted in the best combined factor compared to other two systems(#750, #770).

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.18 no.12
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• pp.1106-1110
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• 2005

We fabricated (110) silicon hard master by using anisotropic wet etching for embossing. The etching chemical for the silicon wafer was a TMAH $25\%$ solution. The anisotropic wet etching produces a smooth sidewall surface and the surface roughness of the fabricated master is about 3 nm. After spin coating an organic-inorganic sol-gel hybrid material on a silicon substrate, we employed hot embossing technique operated at a low pressure and temperature to form patterns on the silicon substrate by using the fabricated master. We successfully fabricated the multi-mode planar optical waveguides showing low propagation loss of 0.4 dB/cm. The surface roughness of embossed patterns was uniform for more than 10 times of the embossing processes with a single hydrophobic surface treatment of the silicon hard master.

• Journal of Engineering Education Research
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• v.7 no.4
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• pp.22-31
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• 2004

The 'focus group' is a well established methodology to evaluate the characters and features of the mother group qualitatively. In outcomes based engineering education, it is a key issue to select a proper tool for evaluating the achievement of outcomes. Based on understanding of the method. A 'focus group' was introduced to evaluate the outcomes qualitatively in the engineering education. The issues in the procedure, implementation and analysis were studied. The guide manual for specific outcomes (life-long learning, contemporary issue, cooperation world-widely) was also suggested.

• Journal of The Korean Association For Science Education
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• v.11 no.2
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• pp.49-65
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• 1991

There is now a large body of research which investigate the preconceptions held by the students in a variety of school levels ranging from the elementary schools to the universities. A problem exists, however, in applying the fingings of the research to the practices of science education. Meanwhile the field of science education is in urgent need of the new instructional theories. One viable means of improving such problematic situation as this is to develop the teaching/learning materials which incorporate the suggestions implied by the results of the research. A prosedure for developing an instructional material and the application of the material in the naturalistic classes are described. Also described in this article are the analyses of the effectiveness of the materials and the implications of this developmental study for the teaching strategies of science.