• 한국지구과학회지
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• 제22권4호
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• pp.259-267
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• 2001

이 연구의 목적은 STS 학습 프로그램의 적용이 실업계 고등학생의 과학과 관련된 태도에 미치는 효과를 찾는 것이다. 이를 위하여 고등학교 ‘공통 과학’ 중 지구과학 영역을 선택하였고, STS 학습 프로그램을 1년 간 경북 구미시의 실업고등학교 2학년 여학생 6개반(318명)을 대상으로 하여 교수-학습에 적용하였다. 이런 과정에서 STS 학습 프로그램에 필요한 학습 보조 자료들도 개발하여 활용하였다. 그 결과 STS 학습 프로그램의 적용 후가 적용 전보다는 학생들의 과학 성취도 및 태도에 긍정적인 효과를 나타낸 것으로 나타났다.

• 대한화학회지
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• 제55권5호
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• pp.875-881
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• 2011

이 연구에서는 자연과학을 전공하는 대학생과 고등학교 과학교사를 대상으로 대학에서의 과학 학습에 영향을 주는 요인과 고등학교 과학교육 개선 방향에 대한 인식을 알아보았다. 대학생들은 전공별로 대학에서의 과학 학습에 주는 영향을 주는 요인에 대해 다른 양상을 보이는 것으로 나타났다. 물리학과의 경우에는 수학 능력과 논리적 사고력, 화학과와 생물학과의 경우에는 영어 능력과 기초 과학 지식이 대학에서 공부하는 데 큰 영향을 준다고 인식하는 경향이 있었다. 대학생과 과학 교사 두 집단 모두 기초 과학 지식과 수학 능력이 대학에서의 과학 학습에 크게 영향을 준다고 인식하는 것으로 나타났다. 대학에서의 성공적인 과학 학습을 위한 과학교육 개선 방안으로, 대학생들은 탐구 기회 확대, 과학교사들은 선택과목의 필수 이수 확대라고 각각 응답하여 두 집단 간 다른 양상을 나타내었다.

• 영재교육연구
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• 제5권2호
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• pp.1-15
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• 1995

The latest researchs show that students have their own preconceptions about scientific phenomena or theory before they learn about it in school. The preconceptions exert a great influence on the teaching and learning science. The purpose of this study is to find out the effect of intelligence and attitude to science on elementary school students were sampled from 4th and 6th grade. Data were obtained by IQ test and the questionnaires on scientific conception and attitude toward science. The result was analyzed by t-test, Correlation and ANOVA in the statistical packages SPSS/PC+. The major findings of this study are as follows : 1. The mean score of scientific conception of elementary school students was 12.89. The mean score of attitude to science was 247.29. The mean score of intelligence was 109.93. 2. The correlation coefficient between scientific conception and intelligence (r=.5098)was relatively high(p<.001). The correlation coefficient between attitude to science and scientific conception(r=.2364) was low(p<.001). 3. Significant difference on science conception was found among grade levels(p<.001). Significant difference on science conception was not found between sex (p>.05). 4. The subjects were divided into 4 groups by intelligence and attitude toward science. These 4 groups show the significant difference (p<.01) in the scientific conception. The groups of high of high intelligence showed high scientific conception.

• 설비공학논문집
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• 제25권4호
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• pp.187-193
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• 2013

Thanks to the characteristic of high-rise buildings, the increase of wind speed according to the height of a building makes it possible to use high wind power resources, many countries led by some advanced nations are recently making steady and persistent effort in introducing small wind turbine systems as a step to lower electric power load in high-rise buildings. The aim of this research is to propose an optimum application process of a small wind turbine system in high-rise buildings. To achieve this goal, the case studies on the applications of high-rise and tall buildings were conducted and the best application among them was selected. On the basis of the case studies, an application process was proposed.

• 영재교육연구
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• 제25권6호
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• pp.971-987
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• 2015

본 연구에서는 학교정보공시를 활용하여 과학중점 고등학교에서의 SW동아리 활동 실태를 분석하였다. 전국의 103개 과학중점 고등학교를 대상으로 SW동아리에 영향을 주는 요인을 분석하였으며, 학교교육계획서, 학교특색사업계획서, 과학중점학교 운영보고서를 통해 SW동아리 활동 실태를 분석하였다. 동아리 참여율에 가장 많은 영향을 미치는 것은 정보교과의 편성이므로 교육과정 개편이 가장 시급한 것으로 판단된다. 또한 SW관련 비교과활동 및 예산지원은 정(+)적 영향을 미치고 있었고, 고등학교가 소재한 지역의 사회 경제적 배경을 반영하기 위해 사용한 학비지원율은 부(-)적 영향을 미치고 있었다. 그러나 고등학교의 전반적인 학력 수준을 파악하기 위한 학업성취도는 유의한 영향을 미치지 않았다. 따라서 가능한 많은 학생들이 SW관련 비교과활동을 할 수 있도록 지원하되, 이를 위해서는 지역 및 학교의 특성을 반영한 프로그램 개발 및 예산지원이 필요할 것으로 판단된다.

• 대한지구과학교육학회지
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• 제6권1호
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• pp.40-49
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• 2013

The purpose of this study was to investigate a motivation system about science learning and interest in science among elementary, middle & high school students and analyze on the their relations. For this, the questionnaires on interest in science that developed by Kind et al., (2007) were selected and translated. After that, second-grade 80 students, fourth-grade 87 students, sixth-grade 107 students, eighth-grade 123 students and eleventh-grade 128 students were required to accomplish a questionnaire on behavioral inhibition system/behavioral activation system about science learning (SL-BIS/BAS), interest in science. Based on these materials, SL-BIS/BAS by student's variables and relations of between the system to interest in science have been analyzed. The result of this study shows the followings. First, the sensitivity about SL-BIS was no significant difference in School levels. But sensitivity about SL-BAS and interest in science in elementary and high school was higher than it in middle school. Second, there were low negative correlation with SL-BIS and interest in science, and relatively high positive correlation with SL-BAS and interest in science. Through the results of this study, relations of motivation to related variables, and the motivation by student's variables are identified. These results would be helpful for teachers to understand the difference about motivation by students' variables and to make a plan for the appropriate strategies for learners.

• 한국방송∙미디어공학회:학술대회논문집
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• 한국방송공학회 2009년도 IWAIT
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• pp.768-772
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• 2009

This paper proposes a method for measurement three-dimensional trajectories of bubbles generated around a swimmer's arms from stereo high-speed camera videos. This method is based on two techniques: two-dimensional trajectory estimation in single-camera images and trajectory pair matching in stereo-camera images. The two-dimensional trajectory is estimated by block matching using similarity of bubble shape and probability of bubble displacement. The trajectory matching is achieved by a consistensy test using epipolar constraint in multiple frames. The experimental results in two-dimensional trajectory estimation showed the estimation accuracy of 47% solely by the general optical flow estimation, whereas 71% taking the bubble displacement into consideration. This concludes bubble displacement is an efficient aspect in this estimation. In three-dimensional trajectory estimation, bubbles were visually captured moving along the flow generated by an arm; which means an efficient material for swimmers to swim faster.

• 전력전자학회:학술대회논문집
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• 전력전자학회 1998년도 Proceedings ICPE 98 1998 International Conference on Power Electronics
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• pp.701-708
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• 1998

This paper presents a novel non-resonant PWM DC-DC converter for X-ray high-voltage power generator using the parasitic impedances of the high-voltage high-frequency link transformer with its output high-voltage control scheme and steady-state characteristics compared to the conventional series-parallel resonant DC-DC converter. The key point of this approach is to evaluate effectiveness of reduction of the turn ratio of the high-voltage high-frequency transformer on improvements in power conversion efficiency and the power factor applying a boost AC-DC converter as DC voltage source, especially in the long exposure term and light output load ranges.

• 한국분말재료학회지
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• 제20권5호
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• pp.338-344
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• 2013

Fe-TiC composite was fabricated from Fe and TiC powders by high-energy milling and subsequent spark-plasma sintering. The microstructure, particle size and phase of Fe-TiC composite powders were investigated by field emission scanning electron microscopy and X-ray diffraction to evaluate the effect of milling conditions on the size and distribution of TiC particles in Fe matrix. TiC particle size decreased with milling time. The average TiC particle size of 38 nm was obtained after 60 minutes of milling at 1000 rpm. Prepared Fe-TiC powder mixture was densified by spark-plasma sintering. Sintered Fe-TiC compacts showed a relative density of 91.7~96.2%. The average TiC particle size of 150 nm was observed from the FE-SEM image. The microstructure, densification behavior, Vickers hardness, and fracture toughness of Fe-TiC sintered compact were investigated.

• 한국과학교육학회지
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• 제15권3호
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• pp.303-309
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• 1995

The purpose of this study was to evaluate the effects of STS Programs on science-related attitude of junior high school students. For this study, samples of 198 students who are in grade 8 were selected. The eight STS Programs were used in this study. One group pretest-posttest design was used in this study as an experimental design. The TOSRA was used in this study as the science-related attitude evaluation instrument. The major results of this study are as followings: 1. The effects of STS programs about the junior high school students' science-related attitude indicated that there were no statistically significant differences between pretest and posttest. 2. Total students were classified as high(above about mean) or low (bellow about mean) on the basis of science-related attitude pretest scores. The low level students have improved from using of STS programs in teaching science on science-related attitude scores. The high level students have dropped from using of STS programs in teaching science on science-related attitude scores.