• 한국초등과학교육학회지:초등과학교육
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• 제22권2호
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• pp.149-155
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• 2003

The objective of this research was to study the impact of metacognitive lesson models on the formation of magnetic field concepts. The subjects of this research was eighty students from two sixth grade classes. One class of forty of these students was the experimental group, which the metacognitive strategic lesson model was applied, and the other class of forty students was the control group which the traditional lessons were conducted. As the result of the experiment, the experimental group and the control group, which previously did not show difference in terms of achievement of conceptualizing magnetic field, displayed a significant difference. According to the comparison between the pre-experiment test on the students' previous concepts and the achievement of the students after the experiment, the middle group showed difference between the experimental group and the control group in a small degree. The lower group showed a notable difference between the two groups and the higher group showed no difference. In terms of achievements shown in different questions asked, there was little difference in the questions that were stated in the textbook while there was a significant difference in the questions that applied the contents of the textbook. The higher academic group, according to the test on the previous concepts, did not show much difference between the experimental group and the control group when they were asked about the concepts of the textbook. In terms of the comparison in the metacognitive levels, both the higher and lower metacognitive experimental groups' average grade was higher than the control groups' and showed an important statistical difference.

• 한국초등과학교육학회지:초등과학교육
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• 제33권2호
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• pp.258-272
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• 2014

The purpose of this study is to investigate the perception on sedimentary rock in elementary science 'Earth and Space' domain for elementary school students. For this purpose, questionnaires on the sedimentary rock perception were developed. And the sedimentary rock perception was examined for random sampling of 5th and 6th grade 656 students. As a result, students chosen incorrect answers of the average 53.8% for questions of sedimentary rock perception. Over the average rate of incorrect answers in 18 questions were 10 questions (3 in the creation of sedimentary rock, 5 in the classification of sedimentary rock, 2 in the sedimentary layer). When the results were stratified by residence, grade and gender, there were significant differences in 8 questions between students in urban and rural areas, in 6 questions between 5th and 6th grade students, and in 3 questions between male and female students. The study that understanding of elementary students for sedimentary rock can be provided for form the master planning the teaching strategy to student's scientific concepts in elementary school. The results are also contributed to find an effective ways for modify misconceptions of sedimentary rock to the scientific concepts.

• 한국초등과학교육학회지:초등과학교육
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• 제32권4호
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• pp.503-514
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• 2013

The purpose of this study is to investigate the perception on fossil in elementary science 'Earth and Space' domain for elementary school students. For this purpose, the fossil perception inventory was developed. And the fossil perception was examined for random sampling of 5th and 6th grade 635 students. As a result, students chosen incorrect answer of the average 30.8% for questions of fossil perception. Over the average rate of incorrect answers in 20 questions were 8 questions(3 in the definitions for fossil, 2 in the creation of fossil, 2 in the fossil, sedimentary, stratum, 1 in the understanding for fossil). When the results were analyzed by residence and grade, there were significant differences in 7 questions between students in urban and rural areas, and between 5th and 6th students, there were important contrasts in 4 questions. The data that understanding of elementary students fossil can be provided for form the basis planning the teaching method to correct student's scientific concepts in elementary school. The results are also contributed to find an effective way for modify misconceptions of fossils to the scientific concepts.

• 대한예방한의학회지
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• 제17권3호
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• pp.115-128
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• 2013

Objectives : This study was aimed to investigate burn out degree of K.M.D.s(Korean medicine doctors) who work at convalescent hospitals and to find contributional factors for the result. The relationship between burn out and job performance was also studied. Methods : 77 K.M.D.s(Male 49(63.6%), Female 28(36.4%)) participated in this survey that has 62 main questions about burn out, job performance, job environment and Social demographic characteristics. Survey was conducted from 19th Aug. 2013 to 6th Nov. 2013. Results : Average of burn out degree of K.M.D.s was 2.62 out of 5. Emotional exhaustion was highest (2.80) and depersonalization was lowest(2.20) among subordinate concepts of burn out. Work place location and average income of the subjective which are subordinate concepts of social demographic characteristics showed significant correlation with job performance. Role conflict, relation of co-worker, workload were significant factors for emotional exhaustion and meaning of the job, will of patient, challenge were significant factors for lack of feeling of accomplishment by multiple regression analysis. Relation of co-worker, aggression of patient and meaning of the job were also significant factors for depersonalization. Conclusion : Emotional exhaustion and lack of feeling of accomplishment among subordinate concepts of burn out were high in the subjective who participated this study. Significant factors that contribute to burn out of this study, shows different result compare to the studies that show other factors contribute to burn out who works at convalescent hospital or other place.

• 재활간호학회지
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• 제5권2호
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• pp.145-155
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• 2002

Purpose: This study tries to analyze the differences of memory performance and the metamemory of the elderly women according to degree of depression. And also it attempts to find the correlations among the sub-concepts of metamemory which have close relationships to the memory performance followed by the depression. Methods: The subjects of this study are 60 the elderly women who are older than sixty years in Busan city, Korea. We use the MIA(Dixon, et al., 1988) to measure metamemory and measure the memory performances such as the immeadiate word recall, the delayed word recall, the word recognition task, and face recognition. Results: 1. The average point of deprssed elderly womens' metamemory was significantly lower than non-depressed womens' point(t=10.86 p<.0017). Looking into subconcept of metamemory, depressed elderly womens' strategy, capacity, change, achievement point were significantly lower than non-depressed women. 2. In terms of immediate word recall and delayed word recall performances, depressed elderly women are significantly lower than non-depressed elderly women. 3. The degree of depressed elderly womens' metamemory(strategy, achievement, change, capacity) has significant correlations with immediate word recall performances. Conclusion: Metamemory has close relationship with the memory performance of elderly women. And also depressed elderly's sub-concepts of metamemory which have influences on their memory performance are different from non-depressed elderly's sub-concepts. Therefore, when we try to develop some programs to prevent memory decrease of elderly women, we should take these point into consideration.

• Computers and Concrete
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• 제3권5호
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• pp.357-373
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• 2006

The concepts of four parameters of nominal water-cement ratio, equivalent water-cement ratio, average paste thickness, fly ash-binder ratio were introduced. It was verified that the four parameters and the mix proportion of mortar can be transformed each other. The behaviors (strength, workability, et al.) of mortar primarily determined by the mix proportion of mortar now depend on the four parameters. The prediction models of strength and workability of mortar were built based on artificial neural networks (ANNs). The calculation models of average paste thickness and equivalent water-cement ratio of mortar can be obtained by the reversal deduction of the two prediction models, respectively. A mortar mix proportion design algorithm was proposed. The proposed mortar mix proportion design algorithm is expected to reduce the number of trial and error, save cost, laborers and time.

• Journal of Biosystems Engineering
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• 제27권1호
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• pp.19-24
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• 2002

According to the field test, the transient power transmission efficiency of a tractor driveline fluctuated in a range of 56 to 86% and the mean value was about 72.5%. Therefore, the constant efficiency model commonly used for a simulation of power performance was not proper far predicting such a variable of efficiency. In order to predict power efficiency more accurately, new concepts of the maximum efficiency and drag torque were introduced and a new model based on the these concepts was proposed. The difference between measured and model-predicted efficiencies was about 1.5% in average with a standard deviation of 1.1%. The new power efficiency model was expected to enhance the accuracy of predicting power transmission efficiencies of tractor drivelines.

• 한국수학교육학회지시리즈A:수학교육
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• 제57권3호
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• pp.311-328
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• 2018

In school mathematics, the concept of an average is not a concept that is limited to a unit of statistics. In particular, high school students will learn about arithmetic mean and geometric mean in the process of learning absolute inequality. In calculus learning, the concept of average is involved when learning the concept of average speed. The arithmetic mean is the same as the procedure used when students mean the test scores. However, the procedure for obtaining the geometric mean differs from the procedure for the arithmetic mean. In addition, if the arithmetic mean and the geometric mean are the discrete quantity, then the mean rate of change or the average speed is different in that it considers continuous quantities. The average concept that students learn in school mathematics differs in the quantitative nature of procedures and objects. Nevertheless, it is not uncommon to find out how students construct various mathematical concepts into mathematical knowledge. This study focuses on this point and conducted the interviews of the students(three) in the second grade of high school. And the expression of students in the process of average concept formation in arithmetic mean, geometric mean, average speed. This study can be meaningful because it suggests practical examples to students about the assertion that various scholars should experience various properties possessed by the average. It is also meaningful that students are able to think about how to construct the mean conceptual properties inherent in terms such as geometric mean and mean speed in arithmetic mean concept through interview data.

• 대한공업교육학회지
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• 제36권1호
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• pp.167-190
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• 2011

이 연구는 기술 가정과 '정보통신기술의 활용'단원에서 문제 해결 과제중심 수업이 주요 개념의 이해 정도와 학습 태도에 미치는 효과를 밝히는 데 그 목적이 있다. 이를 위해 4차시에 해당하는 '정보통신기술의 활용'단원을 실험집단에게는 문제 해결 과제 중심 수업으로 진행하고 통제집단에게는 강의식 수업으로 진행하였다. 서울특별시 소재 중학교 2학년 2개 학급 각 68명으로 구성된 실험집단과 통제집단에 대해 개념의 이해 정도와 학습 태도를 실험한 결과는 다음과 같다. 첫째, 정보통신에 대한 개념 이해 정도를 알아본 실험에서는 사전장사에서 두 집단 사이에 유의미한 차이가 나타나지 않았으나 사후검사에서는 문제 해결 과제 중심 수업을 한 실험집단이 강의식 수업을 한 통제 집단보다 평균 5.87점 높게 나타났다. 아울러 p< .05 수준에서 통계적으로 유의미한 차이를 보였다. 정보 통신에 대한 개념을 4개의 하위 영역으로 구분하였음 때, 통신의 원리와 방식, 네트워크의 연결에 대한 개념 이해에 관한 2개 영역의 검사에서는 두 집단 사이에 p< .05 수준에서 유의미한 차이를 보이지 않았으나 나머지 2개 영역인 정보의 표현과 유형, 통신 네트워크의 구성과 종류에 관한 개념 이해 검사에서는 유의미한 차이가 나타났다. 둘째, 학습태도에 관한 실험에서는 문제 해결 과제 중심 수업을 적용한 실험집단이 강의식 수업을 적용한 통제집단보다 학습태도가 더 바람직하게 변화되고 있음을 확인할 수 있었다. 이러한 결과는 '정보통신기술의 활용'단원에서 문제 해결 과제중심 수업이 강의식 수업에 비해 주요 개념의 이해 정도와 학습 태도를 보다 긍정적으로 향상시킴을 보여준다.

• 한국전자통신학회논문지
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• 제19권1호
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• pp.295-300
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• 2024

본 논문에서는 SNOMED CT 용어체계가 가지는 불완전성을 논의하고 이를 유지하는 방법으로 형제 노드 간 유사성을 평가하는 지표를 제안한다. SNOMED CT는 방대한 양의 의학용어를 포함하고 있으나 계층구조 내 컨셉의 누락 등 온톨로지의 불완전성 문제가 존재한다. 누락된 컨셉 발견을 위해 다수의 노드로 구성된 형제 노드 그룹 내에서의 노드 간 유사도 평가를 위한 지표를 제안하고 유사도가 낮은 그룹을 도출하였다. 2023년 3월 SNOMED CT 국제 배포판에 적용하여 형제 노드 그룹들의 유사도를 분석한 결과 임상적 발견 컨셉의 하위 컨셉들 중 2개 이상의 형제 노드를 가진 29,199개의 형제 노드 그룹의 평균 유사도는 0.81로 나타났다. 반면, 유사도가 가장 낮은 그룹은 중독 컨셉의 자식 컨셉으로 그 유사도는 0.0036으로 확인되었다.