• Proceedings of the Korean Nuclear Society Conference
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• 1998.05a
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• pp.699-706
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• 1998

한국원자력연구소에서는 원자력중장기연구의 일환으로 한국형 표준원전을 모의하는 종합열수력실증실험을 계획하고 있으며, 현재 실험장치에 대한 척도해석(Scaling Analysis), 예비해석(Scoping Analysis) 및 개념설계를 수행하고 있다. 본 논문에서는 영광 3/4호기를 대상으로 척도해석을 통하여 실험장치를 개념설계하고, 저온관 6인치 소형냉각재 상실사고에 대하여 예비해석을 수행한 결과를 보여준다. 개념설계된 실험장치는 높이비가 참조원자로와 동일하고, 체적비가 1/200이다. 실험장치의 개념설계는 이상유동에 대한 3단계 척도법을 적용하였으며, 개념설계의 타당성을 입증하기 위해 RELAP5/MOD3.1 코드를 사용하여 정상상태 및 저온관 6인치 소형냉각재 상실사고시 계통의 거동을 예비 계산하였다. 실험장치에 대한 예비해석결과 사고 거동이 참조원자로와 잘 일치하는 것으로 나타났다. 또한 수평관 및 주냉각재펌프의 척도기준이 사고의 진행과정에 영향을 미치는 중요한 인자로 밝혀졌다

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2019.05a
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• pp.570-571
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• 2019

우리나라의 건설연장에서 발생하는 재해율은 OECD 국가 중 최고 수준이며, 건설현장에서 발생하는 다양한 재해에 대한 예비연구가 필요하며, 건설현장의 다양한 사고유형 중 무너짐(붕괴/도괴)이 38.5%로 가장 높게 나타나고 있으므로 사고원인에 대한 분석과 무너짐에 대한 사전 조짐을 판단할 수 있는 데이터 분석을 통한 예비연구가 필요하다고 할 수 있다. 본 논문에서는 건설현장은 현장의 특성상 사고가 발생하면 큰 사고로 이어지고, 2차사고까지 동반할 수 있기 때문에 건설현장의 상태정보를 체계적으로 관리할 수 있는 안전사고 예방/관리 플랫폼 및 상태계측모듈을 연구개발하며, 건설현장 상태정보로부터 안전사고가 발생할 수 있는 조건을 예측할 수 있는 분석 알고리즘 개발에 대한 연구를 수행하고자 한다.

• Journal of The Korean Association For Science Education
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• v.40 no.5
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• pp.485-502
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• 2020

The purpose of this study was to develop an instrument for the measuring students' state curiosity and anxiety by dividing science learning context into three stages: when confronting scientific task, checking the results, learning science concepts, and verify the validity and reliability of the measurement tools developed. For this purpose, based on the theoretical background of various prior studies, science state curiosity and science state anxiety were defined in three stages of the learning context, and preliminary items were developed according to these definitions. The preliminary items were developed with the same number and the basic framework for each stage to identify changes in state curiosity and anxiety. Some preliminary items were refined during the confirming face validity and content validity. As a result of the exploratory and confirmatory factor analysis, the measurement tool consisted of five items of state curiosity and five items of state anxiety (two factors, ten items) at each stage, and confirmed the construct validity of the measurement tool. The Cronbach alpha was 0.8 or higher for each factor or for all items. This measurement tool is meaningful in that it can measure the state curiosity and anxiety applicable in three stages of science learning context and identify the changes.

• Journal of Educational Research in Mathematics
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• v.24 no.3
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• pp.311-331
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• 2014

For preservice teachers' instrumental-to-relational pedagogical content knowledge transformations, this research designed several didactical tasks based on Kinach's cognitive strategies. The researcher identified preservice teachers' understanding about what is a definition and how to teach it. By challenging their fixed ideas about definitions, the researcher could motivate them to embrace the new teaching approach which guides reinvention of definitions. The PCK development was not the simple process of filling their tabular rasa PCK with theories of mathematics education, but the dialectical process of identifying, challenging, changing and extending preservice teachers' existent PCK. This research will contribute to explore new directions of mathematics teachers' PCK development and the method of teacher education.

• Journal of Elementary Mathematics Education in Korea
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• v.22 no.2
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• pp.161-181
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• 2018

This study involved an investigation of prospective elementary teachers' preconceptions and experiences of diagrams and their ability to draw diagrams in solving math word problems. A questionnaire and two math word problems were administered to prospective elementary teachers who began to taking an introductory mathematics education course. The results from the analysis of their responses to the questionnaire items indicate that prospective elementary teachers appreciate the value of diagrams as tools for problem solving and communication. In addition, prospective elementary teachers have the will not only to teach their future students how to use diagrams but also to encourage them to draw diagrams in solving math word problems. However, the results also indicates that prospective elementary teachers neither use diagrams spontaneously in their math problem solving activities nor have confidence in drawing useful diagrams. Prospective elementary teachers also manifested low scores on the questionnaire items asking whether they were taught how to draw useful diagrams or encouraged by their teachers to use diagrams in their previous learning experiences. The results from the analysis of the diagrams that prospective elementary teachers drew in solving math word problems showed that most of them had difficulty drawing diagrams that represent their reasoning and solving process.

• Korea journal of population studies
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• v.32 no.3
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• pp.73-101
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• 2009

이 연구의 주된 목적은 주택연금제도의 이용의향에 영향을 미치는 요인을 파악하되 예비노인과 노인을 구분하여 살펴보는 것이다. 특히 주택연금제도의 이용의향에 영향을 미치는 변수 중 인구사회 및 경제학적 변수를 포함하여 자녀관련 요인이나 노후대비 관련 요인 등 선행연구에서 조명하지 못했던 변수들을 중심으로 다른 변수들의 영향력을 통제한 후에 이들이 얼마만큼 영향을 미치는지 살펴보고자 하였다. 그 결과 예비노인과 노인에게서 공통적으로 나타났던 결과들은 자녀와의 관계적 측면과 관련된 변수인 주택상속의향이었으며, 다르게 나타났던 결과들은 예비노인의 경우 주택연금제도 이용에 대한 자녀의 찬성정도와 더불어 삶의 질 향상 측면으로 대표되는 다양한 여가활동을 즐길 수 있다는 판단이며, 노인의 경우 주택연금이 자녀부담감소에 도움이 될 것이라는 인식과 더불어 건강상태로 대표되는 경제적인 측면이 주택연금제도 이용의향에 더 영향을 미쳤음을 살펴볼 수 있었다.

• Journal of Convergence for Information Technology
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• v.12 no.5
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• pp.139-149
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• 2022

The purpose of this study is to develop and analyze the effects of an educational program that can cultivate artificial intelligence(AI) convergence education competency for future education and enhance students' understanding of pre-service teachers. For this end, an AI convergence education program using Machine Learning for Kids and Scratch 3 was developed for 15 weeks under the theme of classifying the state of matter. The developed program were treated by K University pre-service teachers who participated voluntarily. As a result, pre-service teachers were able to metaphorically understand the learning process of students through understanding of machine learning training process. In addition, the pre-post t-test result of AI teaching efficacy showed a statistically significant improvement with t=-7.137 (p<.000). Therefore, it is suggested that the AI convergence education program developed in this study can help to increase the understanding of the pre-service teacher's students in an indirect way other than practice teaching, and can contribute to foster AI education competency.

• Journal of the Korean Chemical Society
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• v.59 no.5
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• pp.454-465
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• 2015

The goal of this study is to investigate pre-service chemistry teachers’ understanding of the boiling process of a liquid mixture. We surveyed 65 students in the chemistry program of the College of Education about the boiling point of a 50%(by mole) ethanol aqueous solution and the temperature changes during heating. We then interviewed 9 of these students. According to the survey results, the percent of the pre-service teachers who thought that the boiling point of the ethanol solution would be ‘between the boiling points of ethanol and water (78-100 ℃)’ and ‘the same as that of ethanol’ were 52.3% and 35.4%, respectively. The majority of those who stated the former explained that the boiling point of the ethanol solution increased due to the effects of attraction or blocking by water molecules. Most of those who believed the latter explained that physical properties such as the boiling point would not be changed by the addition of water. With regard to the temperature change during heating, 69.2% of the teachers thought that the temperature would increase gradually while boiling, which some thought resulted from the increasing amount of water in the solution as the ethanol boiled off. Others thought that two temperature plateaus would be observed as each component of the liquid mixture underwent phase transition at its specific boiling point. When asked about the particle model of the gas phase during the boiling and evaporation process, some students drew both ethanol and water during evaporation but only ethanol when boiling. We discussed several alternative concepts of pre-service chemistry teachers about the boiling process of liquid mixtures and ways to improve their understanding.

• The Monthly Diabetes
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• s.219
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• pp.50-51
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• 2008

당뇨병환자가 10만명을 육박해 당뇨 대란이 예상되는 가운데, 당뇨병 예비자 또한 그 수가 만만치 않다. 당뇨병 예비자에는 생활습관이 불규칙하거나, 운동을 전혀 하지 않는 사람, 비만한 사람 등이 포함이 되는데, 당뇨병 전단계라 불리우는 내당능장애와 공복혈당장애 환자도 마찬가지이다. 당뇨병 전단계는 확실하게 당뇨병으로 진단을 받은 것은 아니지만 당뇨병으로 발전할 가능성이 충분한 상태로써 공복, 식후혈당이 이상이 있는 경우를 말한다. 이러한 환자도 당뇨병환자와 똑같은 치료법으로 관리를 해야 훗날 당뇨병으로 발전하거나, 그로 인한 합병증의 피해를 줄일 수 있다.

• Journal of Korean Elementary Science Education
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• v.43 no.1
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• pp.170-184
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• 2024

This study focused on the practical research needed to improve elementary school science lesson plans. Specifically, a video clip-based pedagogical reasoning activity that included elementary student misconceptions was presented and the influences of this activity on preservice teachers' science lesson planning were assessed. First, the eight preservice teacher participants were asked to write a lesson plan for a dissolution and solution unit, after which a first semi-structured interview was conducted. Then, the participants participated in a video clip-based pedagogical reasoning activity. Based on the activity results, the participants revised their previously planned lessons, and second semi-structured interviews were conducted. The data from the preservice teachers' lesson plans and interview transcripts were analyzed using a constant comparative method to investigate the lesson plan changes. It was found that after the video clip-based pedagogical reasoning activity, the preservice teacher tightened the activity or changed the material to understand the students' thinking processes. In addition, they supplemented their goals and assessment criteria to accommodate the diverse students' thinking. Some also specified motivational strategies that considered student interests, motivation, and possible misconceptions. However, some preservice teachers still set goals that did not sufficiently account for student misconceptions and some planned the student assessments based only on the learning goals rather than the students' thinking. The few preservice teachers were able to develop motivational strategies that considered interest, motivation, and misconceptions. The preservice teachers claimed that they had difficulty predicting the misconceptions and connecting these to the lesson content. Discussions were then held to assist the preservice teachers to consider possible student misconceptions when planning their lessons.