• 대한기계학회논문집A
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• 제39권5호
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• pp.517-526
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• 2015

본 논문은 쿼드로터 자세제어의 신뢰성 향상을 목적으로 다종 센서 구성 및 다종 센서 데이터 융합 알고리즘 적용을 연구한 결과이다. 먼저, 쿼드로터에 대한 동역학적 모델링에 관한 수식을 도출하였으며, 획득된 수식을 기초로 쿼드로터에 대한 수학적 모델링을 진행하였고 이를 기반으로 신뢰성이 향상된 다종 센서 데이터를 입력으로 하는 컴퓨터 시뮬레이션을 수행하였다. 쿼드로터 자세제어를 위해 다종 센서 데이터의 신뢰성 향상이 필요했으며 이를 위해 다종 센서 데이터 입력에 대한 칼만 필터링를 진행하였고, 이후 쿼드로터의 수학적 모델링에 적용하여 오차를 보상토록 하였다. 관련 컴퓨터 시뮬레이션 결과를 실제 쿼드로터 시스템에 적용하기 위하여 쿼드로터를 짐벌에 장착한 실제 시스템을 구성하였고 이후 쿼드로터를 호버링 상태에서 사용자가 요구하는 각도 변화에 따른 실험을 수행하였다. 실제 실험을 통한 쿼드로터 자세제어 데이터를 산출하였으며, 이를 바탕으로 추가적인 컴퓨터 시뮬레이션을 통한 설계한 다종 센서 및 쿼드로터 자세 제어 시스템의 성능 검증을 진행하였다.

• 한국수학교육학회지시리즈E:수학교육논문집
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• 제34권4호
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• pp.465-484
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• 2020

본 연구에서는 수학 현장체험학습 프로그램이 학생들의 수학 학습에 대한 태도에 미치는 영향을 밝히고자 하였다. 이를 위해 2019년 제주목 관아에서 학생들이 직접 걸어 다니면서 체험할 수 있는 제주목 관아 매쓰투어(Math-Tour) 프로그램을 개발하였다. 프로그램에는 제주목 관아에서 볼 수 있는 여러 자연물과 인공물을 이용한 수학 문제를 제시하였다. 이후 제주시 A 중학교 학생들을 대상으로 체험하도록 하여 그 효과를 알아보았다. 매쓰투어에 참여한 학생들을 대상으로 사전·사후 수학 학습 태도 검사와 인터뷰를 실시하고, 소감문을 작성하도록 하여 이를 분석했다. 분석 결과, 수학 현장체험학습 프로그램인 제주목 관아 매쓰투어가 학생들의 수학 학습 태도 신장에 통계적으로 유의미한 영향을 미친다는 결론을 얻을 수 있었다. 이는 수학 현장학습 프로그램이 학생들의 수학 학습 태도를 개선하는데 유의미한 방법으로 활용될 수 있다는 것을 시사해 준다.

• 한국수학교육학회지시리즈D:수학교육연구
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• 제14권3호
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• pp.249-262
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• 2010

Large Midwest university faculty members proposed the Science and Technology Enhancement Program Project (STEP) to improve students' learning in the secondary mathematics classroom using modules of inquiry-based teaching. The purpose of this study was to determine the impact of the STEP Project on students' attitude toward mathematics. Hierarchical linear models (HLM) were used to evaluate the impact of the STEP Project. The sample group for the study was 130 ninth grade students enrolled in Integrated Algebra I in a large urban school district. The school was one of eight secondary schools that participated in the STEP Project. The classes in the treatment group were three of five classes ordered in terms of the highest, middle, and lowest mean GPA. The control group consisted of two other middle GPA classes. The classes had an average of 25 students. Teachers who previously had been involved in the STEP Project taught all treatment and control classes. The inquiry-based teaching activities provided by the project were confined to the treatment classes. The survey measuring students' attitudes toward mathematics were obtained for both groups of students. The inquiry-based teaching affected students' attitudes toward mathematics (p < 0.07, ES = 3.07). Especially, students who had preexisting low attitudes toward mathematics were significantly affected by treatment (p < 0.02, ES = 0.02), while the treatment positively affected African American students overall at p < 0.08 (ES = 0.58).

• East Asian mathematical journal
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• 제31권2호
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• pp.245-273
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• 2015

The purpose of this study is to investigate environmental factors that affect mathematics learning of students in multicultural families. For this study, as study subjects, eight elementary school students and one middle school student, who were born and grew up in multicultural families in Korea due to international marriage of Korean father and foreign mother, and their five mothers were selected. To examine factors affecting mathematics learning and interests of students in multicultural families, relationships with parents, friends, and teachers were surveyed, and mathematics attitude test was performed. After conducting one on one interview based on collected questionnaires and results of the attitude test, qualitative data analysis was performed. As a result of survey and interview, positive factors affecting mathematics learning of students in multicultural families included arousing interest in mathematics through mother's mathematics teaching in her mother language and direct teaching, good peer relation, teacher's compliment and encouragement, and lowering the burden of language in accordance with characteristics of mathematics course.

• East Asian mathematical journal
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• 제28권4호
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• pp.363-381
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• 2012

The purpose of this study to analyze correlation for the tendency of mathematics anxiety, traits according to the factors of mathematics anxiety and mathematics attitude depending on the teacher variable through a survey of mathematics anxiety and attitude toward mathematics on teaching mathematics of elementary school teachers. To solve the questions above, sampled 250 elementary school teachers in Daegu province. As a result of the study, mathematics anxiety on teaching is not actually formed a lot. However, the more training experience with mathematics, previous academic career, education career were, the lower mathematics anxiety was. The results showed that mathematics anxiety is affected by previous academic career, training experience with mathematics in particular. In addition, we found that mathematics anxiety is affected by mathematics anxiety in their school, recognition of the ability to explain mathematics contents and attitudes toward mathematics.

• 한국수학교육학회지시리즈A:수학교육
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• 제42권3호
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• pp.403-417
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• 2003

The purpose of this study is to analyze the effects of the use of calculators in elementary school mathematics education. For this purpose, we established the subject matters of the research as folloows; (1) to develop the lesson plan and the students' activity sheet related to the use of calculators. (2) to analyze the effects of the use of calculators when we applied the materials developed. Four classes of sixth grade students were sampled two elementary schools in D city. Two of them were assigned to the calculator group and the others to traditional group. The experiment was conducted for 10 class times. Two kinds of test instruments were used: pretest and post test. The pretest scores guaranteed that both groups were homogeneous. Post-test was used to identify the effect of use of calculator and the post-test scores were analyzed by t-test. We also used questionnaire to identify the students' change of attitude toward mathematics. The results of this study as fellows: (1) The calculator group got scores significantly higher than the traditional group on the test. (2) The students' attitude in calculator group was changed a little positively.

• 한국항공운항학회지
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• 제13권3호
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• pp.9-21
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• 2005

The stable motion has been judged by mathematical modeling of the conditions that a rocket flies flexibly to take an active part in atmosphere. In this paper, the rocket conditions consist of the air speed, thrust and automatic attitude control. Aerodynamic force, a critical trust and a critical air speed are determined by comparing mathematical knowledges with eigenfrequencies of vibration equation. And then rocket object model is designed. Parameters and eigenfrequencies are used in dimensionless forms for in general applications by eliminating restrictions such as dimension, weight and select of materials.

• 한국수학교육학회지시리즈D:수학교육연구
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• 제25권1호
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• pp.21-43
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• 2022

Investigating the relationship between intrinsic and extrinsic motivation and their effects on affective mathematics engagement in a cultural context is critical for determining which types of motivation promote affective mathematics engagement and the relationship with cultural affordance. The investigation in the current study is comprised of two dependent studies. The results from Phase 1 indicate that attitude and emotion are better explained by extrinsic motivation, while self-acknowledgment and value are better explained by intrinsic motivation. The results of Phase 2 indicate that the Korean sample has greater extrinsic motivation, attitude, and emotion, while the U.S. sample has greater intrinsic motivation, self-acknowledgment, and value. The key outcome for this research is that disentangling cultural affordance from the emotional and cognitive structures is impossible.

• Journal of Advanced Marine Engineering and Technology
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• 제28권4호
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• pp.675-684
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• 2004

The Helicopter system has a non-linearity and complexity. Futhermore, because of absence of its correct mathematical model. it is difficult to control accurately its attitudes for elevation angle and azimuth one. Therefore, we proposed a GA-PID control technique to control these angles efficiently. The proposed GA-PID controller can systematically generate optimal PID parameters by applying GA theory to a helicopter attitude control system. Through the computer simulation, the GA-PID technique shows better attitude control characteristic than traditional PID control technique.

• 한국보육지원학회지
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• 제13권6호
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• pp.69-86
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• 2017

Objective: This study was conducted to investigate the effects of small-group arithmetic word problem activities with concrete materials on 5 year old children's mathematical ability and attitude. Methods: A total of 34 five-year-old children (control group 16 children, experimental group18 children) attending two kindergartens in P city participated in this study. Fifteen small-group arithmetic word problem activities with concrete materials were conducted in the classroom of the experimental group twice a week for eight weeks. Before and after the activities, all the participants individually took a basic arithmetic test, mathematical word problem solving test, and mathematical attitudes test. Results: First, we observed that the children in the experimental group achieved significantly higher scores on the mathematical ability tests, including the basic arithmetic test and mathematical word problems solving test when compared to the children in the control group. Second, we also found that children in the experimental group showed higher improvement in the mathematical attitudes test than their counterparts. Conclusion/Implications: The results of this study suggest that small-group arithmetic word problem activities with concrete materials are effective in improving children's mathematical ability and attitudes.