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김상화(Sang Hwa Kim),방정숙(Jeong Suk Pang) 학습자중심교과교육학회 2011 학습자중심교과교육연구 Vol.11 No.4
본 연구는 현행 수학과 교육과정에서 강조하고 있는 수학적 의사소통 능력 신장을 위한 수업 중 표현중심 수학 수업에 대해 살펴보았다. 초등 교사들은 학생 개개인의 수학적 사고나 특성을 살려 다양한 표현을 할 수 있도록 수업을 하는 것이 중요하다고 인식하지만 실제 수업에서는 잘 이루어지지 않는다. 이에 본 연구에서는 2·4·6학년에서 표현중심의 수학적 의사소통 수업을 구현하고 표현중심 성취요소 도달 정도와 학생들의 표현 산출물을 분석하였다. 분석 결과를 토대로 표현중심 수학수업을 구현할 때의 교사 역할에 대한 시사점을 논의하였다. This paper analyzed three mathematics teaching practices focused on representation as a way to fostering students mathematical communication ability which has been emphasized in recent mathematics curricular revisions. Elementary school teachers tend to recognize easily the importance of multiple representations on the basis of individual students mathematical thinking abilities or characteristics, but often report considerable difficulties in implementing such an idea in their actual classrooms. Given this, this paper first illustrates how three teachers implemented mathematics instruction focused on representation in their second, fourth, and sixth grade classrooms respectively. It then analyzes how learning expectations related to mathematical representation were attained in each classroom. Students various products were additionally analyzed in terms of the diversity of representational forms and thinking processes through mathematical representations. This paper finally discusses the role of a teacher for effective mathematics teaching focused on representation.
고정밀 회전체의 불평형 변동에 따른 회전정밀도 영향에 관한 연구
김상화(Sang-Hwa Kim),김병하(Byung-Ha Kim),진용규(Yong-Gyoo Jin) 한국기계가공학회 2012 한국기계가공학회지 Vol.11 No.3
The spindle unit is a core part in high precision machine tool. Rotation accuracy of spindle unit is needed for high dignity cutting and improving the performance of machine tool. However, there are many factors to effect to rotational error motion(rotation accuracy). This study studied how rotational error motion is variation when unbalance amount is variation. Rotation accuracy of initial spindle unit is decided depending on parts and assembly such as bearing. When it is rotation, vibration and noise is appeared depending on volume of unbalance amount, so it works to decrease unbalance amount. The purpose of the study tests that unbalance amount how much effects to initial rotation condition. The result of the study shows that accuracy of parts and assembly is highly necessary to reach high rotation accuracy and unbalance amount hardly effects to initial rotation accuracy. However, it shorten spindle"s life because vibration and noise is increasing by increasing unbalance amount and we can expect situation that rotation accuracy is falling by long time operation.
고정밀 스핀들의 회전정밀도 측정 오차 분리법에 관한 연구
김상화(Sang-Hwa Kim),김병하(Byung-Ha Kim),진용규(Yong-Gyoo Jin) 한국기계가공학회 2014 한국기계가공학회지 Vol.13 No.1
The rotation of a spindle unit must be accurate for high-quality machining and toimprove the quality of the machine tools.Therefore, the propermeasurement of the rotation accuracy and ensuring a proper analysis are very important. Separateprocesses are necessary because spindle errorsand roundness errorsassociated with the test balls can both factor into the measured rotation error values. We used three methodsto discern test ball errors and analyzedwhich could be deemed as the most proper technique in a test of the rotation accuracy of the main spindle of a machine tool.
고정밀 공작기계 이송장치의 정밀도 측정방법 및 불확도 요인에 관한 연구
김상화(Sang-Hwa Kim),김병하(Byung-Ha Kim),최우각(Woo-Gak Choi) 한국기계가공학회 2012 한국기계가공학회지 Vol.11 No.4
Very important content in performance evaluation of machine tool is positioning accuracy and repeatability precision measurements of feed mechanism. A study analyses the measurement method and uncertainty factors by ISO-based test method. Reliable results can’t be derived without the notion of measurement uncertainty. The reason is that the measured value includes a lot of uncertain factors. Finding the factor that affects the measurement of parameter is important for estimation of measurement precision. In this paper, the evaluation of uncertainty analysis about positioning accuracy and repeatability precision measurements of high precision feed mechanism is presented to evaluate the important factors of uncertainty.
홈트레이닝(home training) 참여자들의 자기결정성이 운동만족과 재이용에 미치는 영향 (경찰관련학과 재학생 대상)
김상화(Sang-Hwa Kim) 한국컴퓨터정보학회 2022 韓國컴퓨터情報學會論文誌 Vol.27 No.4
본 논문에서는 홈트레이닝에 참여하여 체력을 단련하고 있는 경찰관련학과 학생들의 자기결정성과 홈트레이닝 만족도와 재이용과의 관계를 알아보고자 하였다. 이를 위해 부산, 경남지역 D, S, K대학교 경찰행정학과, 경찰무도학과 재학생중 홈트레이닝에 참여한 경험이 있는 학생 349명을 대상으로 조사하였다. SPSSWIN VER 25+, AMOS 20.0 프로그램을 이용하여 자기결정성, 운동만족, 재이용 요인간의 관계를 검증한 결과, 첫째, 홈트레이닝 참여자의 자기결정성 하위요인인 자율성, 유능감, 관계성은 홈트레이닝 만족도에 긍정적인 영향을 미쳤다. 둘째, 홈트레이닝 참여자의 운동만족은 홈트레이닝 재이용에 긍정적인 영향을 미쳤다. In this paper, we propose the relationship between self-determination, home training satisfaction, and reuse of police-related students who participate in home training and train their physical strength. The subjects of this study were students enrolled in the Department of Police Administration and Police Martial Arts at D, S, and K universities in Busan and Gyeongnam area. Among them, 349 students who had participated in home training were surveyed. As a result of verifying the relationship between self-determination, exercise satisfaction, and reuse factors using the collected data, SPSSWIN VER 25+, AMOS 20.0 program, First, autonomy, competence, and relationship, which are sub-factors of self-determination of home training participants, had a positive effect on home training satisfaction. Second, exercise satisfaction of home training participants had a positive effect on home training reuse. Based on the research results,It is essential to identify and manage what home training participants demand. It is believed that this can be a positive process for the development of home training.
초등학교 교사들의 수학적 의사소통 활용 실태 및 인식 조사 -초등학교 1,2학년을 담당한 교사들을 대상으로
김상화 ( Sang Hwa Kim ),방정숙 ( Jeong Suk Pang ) 한국수학교육학회 2011 初等 數學敎育 Vol.14 No.2
The national mathematics curriculum revised in 2007 emphasized students` mathematical communication and the curriculum is currently applied to all grades. In order to promote students` mathematical communication, the teacher needs to understand full implications and apply them to instruction. This study examined how teachers employed mathematical communication in their instruction and how they perceived it. The results showed that teachers had lack of understanding of student-centered instruction and mathematical communication. They also did not use various representation activities and discussion-based activities as expected. The number of students per classroom was reported by teachers as a main barrier to promote mathematical communication, but it did not make substantial differences in practice. Building on the results, this paper included implications for improving teachers` conception of mathematical communication.