• 한국환경교육학회지:환경교육
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• 제23권2호
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• pp.32-45
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• 2010

The purpose of the present study is to develop ecological experience learning program for the wetland so that elementary school students can recognize the significance and values of wetland and have the attitudes to protect it through their ecological experience learning, and investigate changes in elementary school students' perception for wetland. The experimental class was composed of 26 elementary school students and took the ecological experience learning. The comparison class was also composed of 26 students who took theoretical learning for wetland. It was found that knowledge and attitudes for wetland of the experimental class were significantly high not only in the knowledge area but also in the affective area than those of the comparison class. And it was found that interest and curiosity into wetland were elevated also in the results of the qualitative evaluation, suggesting that we could get the effect of ecological experience learning. Therefore, it is thought that above all, more experience learning programs for wetland are needed to develop for elementary school students' right view of nature and minds to love it by continuously finding and providing materials of experience learning like those of this research in the future.

• 한국간호교육학회지
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• 제25권2호
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• pp.173-185
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• 2019

Purpose: This study was conducted to develop and test effects of flipped learning on a health education program for allergic rhinitis patients. Methods: The study was a nonequivalent control group pretest-posttest design, with 38 participants (experimental group: 19, control group: 19). The education program for allergic rhinitis patients with flipped learning developed for this study was conducted in pre-class, in-class, and post-class stages for a total of 12 weeks. For the in-class stage, a TREAT model suitable for patient education program was developed. Data were analyzed with an independent t-test and repeated measures ANOVA. Results: The experimental group showed significant improvement in knowledge (F=15.029, p<.001), self-efficacy (F=6.814, p<.001) and self-care behavior (F=41.761, p<.001). In addition, subjective symptoms (F=61.453, p<.001) and quality of life (F=52.413, p<.001) improved. Conclusion: The results of this study show that flipped learning in an education program is an effective method for those in their twenties persistent moderate-severe allergic rhinitis. Therefore, the education program for allergic rhinitis developed by this study is actively recommended for nurses or health managers at universities to educate subjects in their twenties with allergic rhinitis.

• 한국초전도ㆍ저온공학회논문지
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• 제9권1호
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• pp.61-66
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• 2007

A transmission class high-temperature superconducting(HTS) power cable system is being developed in Korea. For insulation design of this cable the grading method of insulating paper is proposed. Two kinds of laminated polypropylene paper that has different thickness has been used as the electrical insulation material. The use of graded insulation gives improved mechanical bending properties of the cable. In a HTS cable technology the terminations are important components. A HTS cable termination is energized with the line-to-ground voltage between the coaxial center and outer surrounding conductors. in the axial direction. There is also a temperature difference from ambient to about 77 K. For insulation design of this termination, glass fiber reinforced plastic(GFRP) was used as the insulation material of the termination body, and the capacitance-graded method is proposed. This paper will report on the experimental investigations on impulse breakdown and surface flashover characteristics of the insulation materials for insulation design of a transmission class HTS power cable and termination. Based on these experimental data, the electrical insulation design of a transmission class HTS power cable and termination was carried out.

• 대한산업공학회지
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• 제40권4호
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• pp.404-414
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• 2014

Yield prediction is important to manage semiconductor quality. Many researches with machine learning algorithms such as SVM (support vector machine) are conducted to predict yield precisely. However, yield prediction using SVM is hard because extremely imbalanced and big data are generated by final test procedure in semiconductor manufacturing process. Using SVM algorithm with imbalanced data sometimes cause unnecessary support vectors from major class because of unselected support vectors from minor class. So, decision boundary at target class can be overwhelmed by effect of observations in major class. For this reason, we propose a under-sampling method with minor class based SVM (MCSVM) which overcomes the limitations of ordinary SVM algorithm. MCSVM constructs the model that fixes some of data from minor class as support vectors, and they can be good samples representing the nature of target class. Several experimental studies with using the data sets from UCI and real manufacturing process represent that our proposed method performs better than existing sampling methods.

• 초등상담연구
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• 제9권1호
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• pp.95-110
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• 2010

본 연구는 또래 칭찬활동 프로그램이 초등학생의 교우관계와 학급응집성에 미치는 영향을 알아보기 위하여 실시되었다. 서울특별시에 소재한 J초등학교 5학년 2개 학급을 실험집단과 통제집단으로 나누어 실험집단에 프로그램을 처치하고 사후검사와 추후검사를 실시하여 프로그램의 효과를 검증하였다. 프로그램의 타당도를 검증하기 위하여 예비 실시를 통해 미비점과 문제점을 보완하였다. 연구 결과 또래 칭찬활동프로그램을 처치한 실험집단은 교우관계와 학급응집성에서 모두 유의미한 효과가 나타났으며, 아동 소감과 연구자의 관찰에서도 이 프로그램을 통해 아동의 교우관계가 개선되고, 학급응집성이 증가한 것을 알 수 있었다. 그러나 통제집단에서도 학기 초 아동의 학급생활 적응으로 인해 교우관계의 일부 하위변인에서 유의미한 효과가 나타났으며, 추후검사에서 실험집단 아동의 교우관계 하위변인 중 일부에서 효과가 감소한 것이 드러나기도 하였다. 학급응집성은 사후검사보다 추후검사에서 더욱 유의미하게 증가한 점으로 보아 본 연구에서 실시한 또래 칭찬활동 프로그램은 학급응집성의 증가와 유지에 긍정적인 영향을 미친다는 것을 알 수 있었다. 앞으로의 연구에서는 교우관계를 지속적으로 높이기 위한 프로그램의 내용 수정이나 추후지도에 관한 연구가 필요하다고 본다.

• 한국초등수학교육학회지
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• 제13권1호
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• pp.115-140
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• 2009

Freudenthal은 수학화를 핵심 개념으로 하는 현실주의 수학 교육론을 주창하였다. 수학화란 현실 안에 있는 여러 현상들을 수학적인 수단을 사용하여 조직함으로써 현실에 질서를 부여하는 활동을 말한다. 본 연구에서는 Freudenthal의 수학화 이론을 바탕으로 제 7차 초등 수학 교과서 5-가 단계의 넓이 단원을 재구성하여 실험적인 지도만을 작성한 다음, 이를 통하여 교수 실험을 실시함으로써, 수학화를 통한 넓이의 지도 방안의 효과와 더불어 학생들의 넓이 개념과 공식에 대한 이해 실태를 분석하였다. 그 결과, 넓이의 개념 이해 측면에서는 실험반 학생들이 우수하였으나, 넓이의 계산 측면에서는 유의미한 차이가 없는 것으로 나타났다.

• International journal of advanced smart convergence
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• 제4권1호
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• pp.64-70
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• 2015

This paper proposes fluorescent electronic ballast with high power factor and low line input current harmonics. The system performance can be improved by a charged pump circuit. Details of design and circuit operation are described. The proposed electronic ballast is modified from single-stage half bridge class D electronic ballast by adding capacitor parallel with each power switch and setting the circuit parameter to operate under class DE inverter condition. By using this proposed method the DC bus voltage can be reduced around by 50% compare with conventional class D inverter circuit. Because the power switches are operated at zero voltage switching condition and low dv/dt of class DE switching. The experimental results show that the proper frequency of the prototype is around 50 kHz with input power factor of 0.982, $THD_i$ 10.2% at full load and efficiency of more than 90%.

• 대한치과교정학회지
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• 제24권4호
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• pp.819-826
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• 1994

This study was designed to get the knowledges of the ideal arch form of the class I malocclusion patients of Koreans with first premolar extraction. The subjects consisted of 98 individuals with class I malocclusion with first premolar extraction. The results were as follows ; 1 Author found the ideal arch shape of the class I malocclusion patients with first premolar extraction. 2. Equations of ideal arch form of the class I malocclusion patients with first premolar extraction were obtained from SPSS.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2003년도 추계종합학술대회
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• pp.548-551
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• 2003

JSize 는 유닉스 운영체제의 size 프로그램에 대응하는 자바 등가 프로그램이다. 유닉스 size 프로그램은 실행 파일을 분석하여 그 파일이 메모리에 적재되었을 때 얼마 정도의 코드와 데이터 영역을 차지할지를 예측하게 한다. 마찬가지로 JSize 는 자바 클래스 파일을 분석하여 그 파일이 메모리에 적재되었을 때 얼마 정도의 클래스 영역 메모리를 차지할지를 예측하게 하는 기능을 갖는다. 본 논문은 클래스 파일을 분석하여 얻은 정보로부터 클래스 영역의 크기를 예측할 수 있게 하는 원리에 대해 소개한다. 아울러 실험을 통해 JSize 의 예측 정확성을 실제로 알아보았다.

• 대한원격탐사학회지
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• 제36권1호
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• pp.55-65
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• 2020

Image classification needs the spectral similarity comparison between spectral features of each pixel and the representative spectral features of each class. The spectral similarity is obtained by computing the spectral feature vector distance between the pixel and the class. Each spectral feature contributes differently in the image classification depending on the class separability of the spectral feature, which is computed using a suitable vector distance measure such as the Bhattacharyya distance. We propose a method to determine the weight value of each spectral feature in the computation of feature vector distance for the similarity measurement. The weight value is determined by the ratio between each feature separability value to the total separability values of all the spectral features. We created ten spectral features consisting of seven bands of Landsat-8 OLI image and three indices, NDVI, NDWI and NDBI. For three experimental test sites, we obtained the overall accuracies between 95.0% and 97.5% and the kappa coefficients between 90.43% and 94.47%.