• Journal of the Korean Chemical Society
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• v.47 no.2
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• pp.155-164
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• 2003

This study examined the types of explanations related to physical change and chemical change in the science textbooks of middle and high school based on the prior study of science teachers' understanding. For this research, the researchers analyzed 44 textbooks of middle school science and high school chemistry. As a result, there were no explanation or property type explanation represented in most of the textbooks related to physical and chemical change concepts. Also, there are few relationship represented between physical change and chemical change, and the examples related to physical change and chemical change were confused. These representations of textbooks can give rise to confusion of understanding of teachers and learners. So, it needs to re-design the explanation types correctly and constantly in science textbooks related to physical change and chemical change.

• Journal of the Korean Society of Earth Science Education
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• v.6 no.2
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• pp.112-123
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• 2013

Under this research, the survey is made on the definitive influence of the first-year education process of the science focus school for each of humanities, science and science core courses and the level of satisfaction of the non-curriculum experiment activity program for each course to find out the effectiveness of the first-year education process of the science focus school. For this purpose, this research has set three research issues. First, By clarifying the research result through the first-year education curriculum for science core school, noticeable change was observed for science focus school students through the change of attitude related to science for each desired course of students. Second, in the self-directed learning characteristics change, there was meaningful change for each desired field of students. Students hoping for humanities curriculum had great help in improvement of creative thinking for openness, creativeness and the like, but the influence was slightly insufficient in the moderation and control capability on themselves in learning attitude. Third, By analyzing the research result comprehensively, the first-year education curriculum for science core school provides high level of tailored science learning for the science focus school students and the level of satisfaction for students was significantly high.

• Proceedings of the Korean Magnestics Society Conference
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• 2008.12a
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• pp.60.1-60.1
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• 2008

• 한국정보디스플레이학회:학술대회논문집
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• 2006.08a
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• pp.1210-1213
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• 2006

The effect of surface treatment on CNT cathodes used in field emission displays was investigated. A liquid method using a polymer-based organic solution and a mechanical method were applied. The liquid method, using PVA(polyvinyl alcohol) showed high potential compared to the mechanical adhesive taping and rolling method used in the fabrication of CNT cathodes for large-sized field emission displays with high emission uniformity and a low cost.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2022.10a
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• pp.404-406
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• 2022

In this study, a data science class plan was designed for the high school credit system in general high schools. Since it is difficult to secure class hours in elementary and middle schools or general high schools, learners cannot freely take new subjects such as data science. Therefore, a lesson plan was designed based on the ADDIE model for 15 students who applied for data science at general high schools in A city. Through this study, it was possible to design the data science class according to the learning method.

• Proceedings of the KIPE Conference
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• 2003.07b
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• pp.499-502
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• 2003

This paper presents the voltage source type half bridge lossless auxiliary inductor snubber assisted series capacitor compensated resonant high frequency inverter for induction heated fixing roller in copy machines. This high-frequency inverter treated here can completely achieve zero current soft switching (ZCS) commutation for wide power regulation range under its constant frequency pulse density modulation (PDM) scheme. Its transient and steady-state operating principle is originally presented fur a constant frequency PDM control strategy under a ZCS operation commutation, together with its output effective power regulation characteristics-based on the PDM strategy. The experimental operating performances of this ZCS-PDM high frequency inverter using IGBTs are illustrated as compared with computer simulation ones. Its power losses and actual efficiency are evaluated and discussed on the basis of simulation and experimental results.

• Hwankyungkyoyuk
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• v.19 no.3
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• pp.93-101
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• 2006

The purpose of this study was to investigate the cognition of high school students and science teachers on the endocrine disruptors. Subjects of this study were 204 high school students and 26 science teachers. The results were as follows. Students obtained informations about endocrine disruptors mainly through mass media like TV, radio or lesson in school. Most of them were interested in endocrine disruptors and they thought that endocrine disruptors were very dangerous for people. And they preferred learning materials such as movies, images, and animations, but they didn't want to participate in activity of education on endocrine disruptors actively. Science teachers has agreed to needs of education on endocrine disruptors and has required education programs such as movies, images or animations for effective endocrine disruptors education.

• Progress in Superconductivity and Cryogenics
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• v.23 no.3
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• pp.5-9
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• 2021

Comprehensive utilization of sulfur-containing iron tailings (SIT) not only solves environmental problems but also creates certain economic value. The iron element from SIT was enriched by the superconducting high gradient magnetic separation (S-HGMS) technology in this study. In the experiments, the total iron content (TFe) was increased from 26.3% to 60.5% with the total sulfur content (TS) of 5.9% under the optimal parameters, i.e., a magnetic flux density of 0.4 T, a slurry flow rate of 1500 mL/min. The high-quality sulfur-containing material with TFe of more than 60% was obtained, which can be used for preparing high-sulfur free cutting steel. The S-HGMS technology can realize the resource utilization of iron tailings with high added value.

• Journal of Gifted/Talented Education
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• v.23 no.1
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• pp.25-47
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• 2013

The purpose of this study was to explore the meaning of early entrance experiences of science gifted high school students. The subjects were 13 students who are attending science gifted high school in Seoul. The research data were collected through in-depth interviews. The qualitative study applied the phenomenological method of Giorgi. The early entrance experiences of science gifted high school students were clustered into 13 specific themes and 5 general structures. The results indicated that the early entrance students were surprised by their admissions from the school and they worry about their lack of readiness. However, they follow up their missed 1 year study after all. It took from a few weeks to 1~2 years depending on the student. At any rate, the environment of the school such as differentiated curricular, dormitory life, and studying atmospheres were helpful for the students to adopt easily. Even though they sometimes show a little deficiency, it won't be an issue, they just corporate each other and pursue their studies. As time goes on, they become friends even though they call other students 'big brother'. When the placement of gifted students take place, we do not need to hesitate because of their age, but need to consider the environment of school and characteristics of student.

• Journal of Korean society of Dental Hygiene
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• v.5 no.1
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• pp.53-62
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• 2005

To prepare basic data for oral health promotion of high school students through the survey of the recognition of oral health care, a questionnaire survey was conducted for 268 students. Statistical analysis was conducted using the SPSS 11.5 with ${\chi}^2$-test, fisher's exact test, t-test and logistic regression. The obtained results were as follows 1. The average of the high school student's oral health knowledge was $13.12{\pm}2.06$. Statistically school girls were higher(pE0.05) than school boy's oral health knowledge(male: 12.91, female: 13.35), tooth brushing frequency(male: 4times or more-15.4%, female: 4times or more-29.8%), and preventive dental visit(male: 8.1%, female: 17.5%). 2. More than 70% of high school students was concerned about oral health. According to the self-judgement of oral health, more than 50% of them was answered that they wasn't sure of oral health. 3. Only 13% of high school students received oral health education and 80% of them recognized oral health manpower's education needs. 4. The logistic regression analysis illustrated that high school student's preventive dental visit was independently associated with the self-judgement of oral health. The odds ratio was 3.0 and statistically significant.