• 대한화학회지
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• 제56권2호
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• pp.274-289
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• 2012

이 연구의 목적은 중학교 과학수업에서 나타나는 과학교사의 교수전략을 분석하고, 이러한 전략을 사용하는 이유로 부터 교수지향을 분석하고, PCK의 요소들 사이의 관계를 파악하여 PCK 모델의 개선 방향에 대하여 제안하는 것이다. 이를 위하여 교육 경력 등이 다양한 3명의 교사들을 연구대상자로 선정하였다. 그리고 반 구조화 된 면담과 수업 관찰을 통해 자료를 수집하였다. 얻은 자료로부터 연구대상 교사들의 교수전략의 유형을 분석하여 이를 근거로 교수지향을 판단할 수 있었다. 또한 교수전략을 사용한 이유로부터 교수내용지식의 다른 요소들인 교육과정에 대한 지식과 학습자에 대한 지식이 중요하게 영향을 미쳤음을 확인할 수 있었다. 따라서 수업을 통해 드러나는 실천적 교수전략은 내면화된 교수지향을 판단하는 가장 효율적인 방법이며, 교육과정에 대한 지식과 학습자에 대한 지식은 교수전략을 형성하는 근간이 되는 PCK 요소임을 확인하였다. 이러한 연구 결과를 토대로 PCK 모델 개선의 필요성을 제안하였다.

• Animal Bioscience
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• 제37권8호
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• pp.1317-1332
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• 2024

Objective: Rare study of the non-coding and regulatory regions of the genome limits our ability to decode the mechanisms of fatty liver hemorrhage syndrome (FLHS) in chickens. Methods: Herein, we constructed the high-fat diet-induced FLHS chicken model to investigate the genome-wide active enhancers and transcriptome by H3K27ac target chromatin immunoprecipitation sequencing (ChIP-seq) and RNA sequencing (RNA-Seq) profiles of normal and FLHS liver tissues. Concurrently, an integrative analysis combining ChIP-seq with RNA-Seq and a comparative analysis with chicken FLHS, rat non-alcoholic fatty liver disease (NAFLD) and human NAFLD at the transcriptome level revealed the enhancer and super enhancer target genes and conservative genes involved in metabolic processes. Results: In total, 56 and 199 peak-genes were identified in upregulated peak-genes positively regulated by H3K27ac (Cor (peak-gene correlation) ≥0.5 and log2(FoldChange) ≥1) (PP) and downregulated peak-genes positively regulated by H3K27ac (Cor (peak-gene correlation) ≥0.5 and log2(FoldChange)≤-1) (PN), respectively; then we screened key regulatory targets mainly distributing in lipid metabolism (PCK1, APOA4, APOA1, INHBE) and apoptosis (KIT, NTRK2) together with MAPK and PPAR signaling pathway in FLHS. Intriguingly, PCK1 was also significantly covered in up-regulated super-enhancers (SEs), which further implied the vital role of PCK1 during the development of FLHS. Conclusion: Together, our studies have identified potential therapeutic biomarkers of PCK1 and elucidated novel insights into the pathogenesis of FLHS, especially for the epigenetic perspective.

• 한국수학교육학회지시리즈A:수학교육
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• 제56권4호
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• pp.407-434
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• 2017

The purpose of this study is to develop and verify the TPACK measurement tool for middle and high school mathematics teachers in the Korean context. Also, by clarifying the relationship between subordinate factors of Mathematics teachers' TPACK, an attempt was made to provide suggestions on the designs and directions for the in-service and pre-service teacher education and the programs for improving mathematics teachers' TPACK in the future. In order to achieve this goal, TPACK factors of mathematics teachers were extracted by reviewing literature on PCK, MKT, and TPACK. Then, content validity, basic statistical survey, reliability verification, exploratory factor analysis, confirmatory factor analysis, and structural equation model verification were conducted sequentially. At first, preliminary analysis was carried out on 79 mathematics teachers, and 76 items excluding the items with extreme value and reliability were included in the basic statistical analysis. And secondly, an exploratory factor analysis was conducted on 376 mathematics teachers, and this instrument consisted of 7 subordinate factors(CK, PK, TK, PCK, TCK, TPK, TPACK) and 61 items. Also by conducting confirmatory factor analysis and structural equation model test with 254 mathematics teachers, the measurement tool was confirmed the validity and reliability through statistically significant analysis. Then, the importance of integrated knowledge was confirmed by looking at the relationship between the TPACK factors of in-service mathematics teachers. The integrated knowledge(PCK, TCK, TPK) has played a crucial role in the formation of TPACK rather than the knowledge of CK, PK, and TK alone. Finally, the validity of TCK was confirmed through the structural equation modeling of TPACK. TCK not only directly affected TPACK, but also indirectly through TPK. According to these affirmative results, this measurement tool is claimed to be suitable for measuring the factors of Mathematics teachers' TPACK, and also the structural equation model can be regarded as a suitable model for analyzing the structural relationship of mathematics teachers' TPACK.

• 한국지구과학회지
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• 제45권3호
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• pp.239-259
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• 2024

본 연구에서는 지구과학 교육 연구 논문들을 대상으로 질적 메타 분석을 통해 집단적 PCK (cPCK) 중 '특정 과학 주제(온실 효과, 지구 온난화, 기후변화)에 대한 학생 이해 지식'을 도출하고자 하였다. 이를 위해 온실 효과, 지구 온난화, 기후변화에 대한 학생 대체 개념(오개념)과 관련된 지구과학 교육 연구 논문 22편을 선정하여 각각의 정의, 원인(매커니즘), 그리고 영향에 대하여 분석하였다. 분석 결과를 종합하기 위해 언어 네트워크 분석, 정신모형틀을 적용하였다. 연구 결과는 다음과 같다; (1) 온실 효과에 대한 학생들의 개념 이해를 메타 분석한 결과, 온실 효과와 지구 온난화를 같은 의미로 사용하는 것으로 분석되었으며, 온실 기체의 종류를 제한적으로 알고 있고, 온실 기체의 역할을 이해하지 못하는 것으로 나타났다. 또한 온실 효과의 발생을 환경오염이나 오존층의 변화와 관련지어 생각하고, 지표-대기의 열수지 평형과 온실 효과를 관련짓지 못하는 것으로 분석되었다. (2) 지구 온난화에 대한 학생들의 개념 이해를 메타 분석한 결과, 지구 온난화를 해수면 상승과 같은 의미로 사용하는 것으로 분석되었으며, 지구 온난화의 발생을 환경오염, 오존층의 변화, 빙하의 융해와 관련지어 생각하고, 지표-대기의 열수지 평형이 깨져 지구 온난화가 나타나는 것으로 이해하고 있었다. 또한 지구 온난화가 환경에 미치는 영향을 잘못 알고 있는 것으로 분석되었다. (3) 기후변화에 대한 학생들의 개념 이해를 메타 분석한 결과, 기후변화를 지구 온난화, 기상 변화, 기상 이변과 같은 의미로 사용하는 것으로 분석되었으며, 기후변화의 발생을 대기오염, 오존층의 파괴와 관련지어 생각하는 것으로 분석되었다. 또한 기후변화가 우리 생활과 환경에 미치는 영향을 잘못 알고 있는 것으로 분석되었다. 이에 대한 분석 결과를 언어 네트워크 분석을 통해 종합한 결과, 집단적 PCK로서 3가지 정신모형(범주적 오해, 기제적 오해, 위계적 오해)을 표현할 수 있었다. 이와 같은 연구 결과를 바탕으로 지구과학 교사 PCK 개발을 위한 함의를 논의하였다.

• 한국과학교육학회지
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• 제33권7호
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• pp.1385-1402
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• 2013

이 연구는 끓는점 오름에 대한 내용표상화 활동과 모의수업 실행을 통해서 예비교사의 PCK를 분석하였다. 예비교사의 지식을 PCK 요소에 따라 분석한 결과, 대부분의 예비교사는 끓는점 오름에 대한 개념적인 이해를 중시하였는데, 일부는 끓는점 오름 현상을 과학적인 시각으로 이해하고, 수식을 도구로 사용하며, 실생활에 적용되는 경험을 통해 학습 동기를 얻게하는 과학 교수 지향도 보였다. 예비교사는 끓는점 오름에 관하여 가르쳐야 할 중요한 내용의 대부분을 개념 이해를 위해 습득해야 할 지식으로 제시했으며, 과학적 사고나 탐구능력 신장을 위한 내용은 나타나지 않았다. 또한 교과서 내용의 수준과 전개 순서에 의존하는 경향을 보였으며 일부는 교과서 편집상 강조되어있는 용어나 자료를 학습할 내용으로 여기거나, 예제 문제의 풀이를 학습 목표로 보는 경우도 있었다. 학생 이해에 대한 지식은 부족한 것으로 나타났는데, 실제 교수 경험이 없는 예비교사들은 자신의 학습 경험을 바탕으로 학생 수준을 간접적으로 이해하려고 시도하므로, 예비교사교육과정에서 오개념 자료 등을 적극적으로 활용할 필요가 있다. 교수 전략과 평가에 대한 지식은 다른 요소에 비해 피상적으로 표현되었는데, 목표와 연계된 방법을 고민하기 보다는 순환학습과 발견학습 같은 모형의 적용만을 언급하거나 일반적인 평가 방법을 나열하는데 그쳤다.

• Structural Engineering and Mechanics
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• 제82권3호
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• pp.271-282
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• 2022

The active learning surrogate model based on adaptive sampling strategy is increasingly popular in reliability analysis. However, most of the existing sampling strategies adopt the trial and error method to determine the size of the Monte Carlo (MC) candidate sample pool which satisfies the requirement of variation coefficient of failure probability. It will lead to a reduction in the calculation efficiency of reliability analysis. To avoid this defect, a new method for determining the optimal size of the MC candidate sample pool is proposed, and a new structural reliability analysis method combining polynomial chaos-based Kriging model (PC-Kriging) with adaptive sampling region is also proposed (PCK-ASR). Firstly, based on the lower limit of the confidence interval, a new method for estimating the optimal size of the MC candidate sample pool is proposed. Secondly, based on the upper limit of the confidence interval, an adaptive sampling region strategy similar to the radial centralized sampling method is developed. Then, the k-means++ clustering technique and the learning function LIF are used to complete the adaptive design of experiments (DoE). Finally, the effectiveness and accuracy of the PCK-ASR method are verified by three numerical examples and one practical engineering example.

• 한국가정과교육학회지
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• 제29권1호
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• pp.35-56
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• 2017

본 연구의 목적은 가정과교사를 대상으로 가정교과교육학 지식의 구성요인을 확인하여 척도를 개발한 후 개발된 측정도구의 신뢰도와 타당도를 검증하는 것이다. 이러한 연구 목적을 달성하기 위해 문헌 연구를 기초로 문항을 구성한 후 현직 가정과교사를 통해 내용타당도를 검증하였으며, 예비조사는 우편조사를 통하여 137개 응답을, 본 조사는 온라인 조사방법을 이용하여 220개 응답을 수집 분석하였다. 연구결과는 다음과 같다. 첫째, 가정교과교육학 지식을 반영하는 29문항을 개발하고 현직 가정과교사와 함께 각 문항이 측정하고자 하는 목적에 타당한지 내용타당도를 검토한 후 7문항이 제거되어 가정교과관 지식(6문항), 가정과교육과정 지식(9문항), 가정과수업전략 지식(7문항) 등 3개 영역의 22개 문항을 확정하였다. 둘째, 내용타당도를 거친 22문항들은 예비조사에서 신뢰도 검사를 한 결과 가정교과교육학 지식 전체와 각 요인의 Cronbach ${\alpha}$는 모두 기준치 0.7 이상, 문항간 총간 상관계수도 기준치 0.5 이상으로 높은 신뢰도를 보였다. 셋째, 본 조사에서는 신뢰도와 구인 집중 판별 준거타당도를 검사하였다. 신뢰도검사를 한 결과 Cronbach ${\alpha}$와 문항간 총간 상관계수 모두 기준치 이상으로 나와 높은 신뢰도를 보였다. 확인적 요인분석을 통해 구인타당도를 검증하기 위해 적합도 지수를 알아본 결과(CFI=.92, RMSEA=.06, SRMR=.05), 세 요인으로 구성된 측정도구가 가정교과교육학 지식을 잘 반영하고 있음을 확인하였다. 집중 판별 타당도 검증을 위해 각 구성요인의 문항들이 해당 요인에 의해 잘 설명되는지를 검사한 결과, 세 잠재요인 모두 수용가능한 신뢰도 수준과 변별력을 보였다. 준거타당도는 교사효능감과 측정도구의 상관계수가 0.7로 나타났고, 단순회귀분석을 통해 가정교과교육학 지식이 높을수록 교사효능감이 높은 것으로 나타났다. 이와 같이 신뢰도와 타당도 검사를 통해 3개 요인 22개 문항으로 이루어진 가정교과교육 지식을 측정하는 도구가 검증되었다.

• 대한지구과학교육학회지
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• 제4권3호
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• pp.278-296
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• 2011

The purpose of this study is to examine the pedagogical content knowledge (PCK) elements and the changes in the science lesson planning and implementation difficulties experienced by high-career elementary school teachers with over 20 years of educational experience through the instructional consulting case of the Seoul City Office of Education Scholarship Support Group in order to find implications on effective instructional consulting support plan for improving the science teaching professionalism of high-career elementary school teachers. The result of this study is as follows : First, the pedagogical content knowledge (PCK) elements on the science lesson planning and implementation difficulties experienced by high-career elementary school teachers with over 20 years of educational experience were related to teaching strategy and they experienced difficulties in lesson content organization using lesson model and experiment facilitation and questioning, as well as in the area of interest and motive management that are definitional characteristic of learner in the learner element. Second, as for the changes in the PCK through science instructional consulting, they recognized the importance of the designing and experimenting process as students become the subject in the experiment facilitation in lesson, and they ended up attempting the postscript for promoting the thinking power of students. In addition, it was found that not only the cognitive characteristic but also the definitional characteristic of learner is important in science lesson and that students' motive is also an element that needs to be continuously managed. Third, as for effective instructional consulting plan for enhancing the science teaching professionalism of high-career elementary school teachers, it was revealed that it is necessary to first develop lesson expertise improvement consulting program that takes into account of teaching profession advancement phase of high-career teachers, and establish instructional consulting system and human resource pool of high-quality consultants based on the administrative and financial support from the Office of Education. The academic significance of this study is in the fact that it examined and searched for support plan on science teaching professionalism of high-career elementary school teacher, but a more extensive and in-depth study is needed since there is a limitation in this study on the object of study and the period.

• 한국수학교육학회지시리즈A:수학교육
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• 제57권1호
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• pp.1-36
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• 2018

The purpose of this study is to examine the relationship between utilization of technology and TPACK in mathematics teachers, and to analyze needs and retentions, difference between needs and retentions, and educational needs of TPACK in mathematics teachers. Furthermore, we will prioritize TPACK items that mathematics teachers want to change, and provide implications for teacher education related to TPACK in the future. To do this, we analyzed 328 mathematics teachers nationwide by using survey on the utilization of technology, averages of TPACK's needs and retentions, t-test of two averages, Borich's educational needs analysis, and the Locus for Focus model. The results are as follows. Firstly, the actual utilization rate was lower than the positive recognition of utilization of technology by mathematics teachers, and many mathematics teachers mentioned the lack of knowledge related to TPACK. Secondly, the characteristics of in-service mathematics teacher's needs and retentions for TPACK were clear, and TPACK's starting line of in-service mathematics teacher can be different from pre-mathematics teacher's. The retentions was high in the order of CK, PCK and PK, and the needs was higher in the order of TPACK, TCK, TK and TPK. All of the higher retentions were knowledge related to PCK, and the value of CK was extremely high among them. In addition, mathematics teachers recognized needs for integrated knowledge related to technology, and they needed more TCK than TPK. The difference between needs and retentions showed that all items except two items in the PK were significant. Retentions of all items in CK was higher than needs, needs of all items in TK, TCK, TPK and TPACK was higher than retentions, PK and PCK were mixed. Thirdly, based on the analysis of Borich's educational needs and the Locus for Focus model, teacher education on TPACK for mathematics teachers needs to focus on TPACK, TK, TCK, and TPK. Specifically, TPACK needs to combine technology in terms of creativity-convergence, mathematical connections, communication, improvement of evaluation quality, and TK needs to new technology acquisition, function of utilizing technology, troubleshoot problems with technology, TCK needs to mathematical value(esthetic, practical) with technology, and TPK needs to consider technology in terms of evaluation methods, teaching and learning methods, improvement of pedagogy. Therefore, when determining the direction of teacher education related to TPACK in the future, if they try to reflect these items in detail, the teachers could participate more actively and receive practical help.

• 대한지구과학교육학회지
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• 제6권1호
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• pp.69-77
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• 2013

The study aims to figure out pre-service elementary teachers' knowledge understanding on 'stratum and rock' as well as teaching-learning types on the same topic. A total of 65 seniors in an advanced science education course at B University of Education joined the research to fulfill the purpose above. With PCK classification framework, the study examined pre-service teachers' knowledge understanding on 'stratum and rock' while it analyzed how the teachers would teach the given topic to students. The results of the study are presented as follows. First, it was observed that the pre-service elementary teachers have a great understanding on 'stratum and rock' that would be taught via a science textbook for elementary fourth graders. However, regarding terms in 'shale and limestone', they appeared to have a relatively short understanding. Second, PCK elements of the pre-service teachers related to 'stratum and rock' were analyzed and according to the results, the teachers would be interested in teaching model selecting in the teaching-learning strategy field while they would be well aware of how important it is for them to perform an experiment in a teaching process. The teachers also appeared to understand that the teacher question can be mutual complementary during class. However, it turned out that the teachers would have a very much low understanding on learners' prior knowledge as they particularly believe that learning could be significantly affected by the learners' perception level as well as their learning interest and motive. Third, the pre-service elementary teachers were told to design teaching plans on 'stratum and rock' so that the study could find out what learning-teaching methods the teachers would adopt to teach the topic. It was learned that the teachers would proceed with the class basically by giving the learners a descriptive explanation on the topic and also by using pictures and drawings to enhance the learners' understanding during the class.