• Journal of the Korean Society of Earth Science Education
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• v.14 no.3
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• pp.267-276
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• 2021

The purpose of this study is to research seasonal constellation experiments and to find out what are effective seasonal constellation experiments according to school salary. we organized seasonal constellation experiments with 24 elementary preparatory teachers and asked them to what effective experiments are for each school class. As a result, constellation learning through direct experience activities through role play is the most effective in elementary school, and in middle and high schools, using the stellarium program to realistically observe and reason about seasonal changes in constellations was selected as an effective experiment. Pre-service teachers recognized that experiments in which direct experience and specific manipulation activities were emphasized in elementary school, and experiments in which observation of realistic natural phenomena and reasoning activities were emphasized were effective in middle and high schools.

• The Bulletin of The Korean Astronomical Society
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• v.41 no.2
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• pp.53.1-53.1
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• 2016

국립대구과학관 천체 관측 핵심시설인 1m 반사망원경을 개발하고 설치 완료하였다. 본 발표에서는 국립대구과학관 1m 망원경의 시스템 사양과 개발 및 설치과정을 전반적으로 기술하고 앞으로의 활용계획에 대해 소개하고자 한다. 이번에 도입된 주망원경은 지난 2014년 11월부터 광학계 및 마운트 설계를 시작으로 2016년 5월까지 약 1년 6개월의 개발기간을 거쳐 설치 완료되었다. 순수 국내기술로 개발된 주망원경은 주경 1,000mm(부경 300mm)의 유효구경을 가지며 후방초점거리가 700mm인 초점비 F/8의 리치-크레티앙 방식의 광학계로 설계되었다. 레이저 간섭계를 이용하여 거울면 전체의 형상 오차를 정밀하게 측정한 결과 주경면 PV < ${\lambda}/4$, RMS < ${\lambda}/20$, 부경면 PV < ${\lambda}/10$, RMS < ${\lambda}/50$의 형상 정밀도를 가진다. 포크형태의 경위대식 마운트 구조로 방위각, 고도 양축과 디로테이터에 각각 모터가 장착되어 움직이는 다이렉트 드라이브 방식으로 구동된다. 최대 구동속도는 $2^{\circ}/s$이상, 포인팅 정밀도는 2'이하, 10분간 추적 정밀도는 3"이하(10분간 오토가이더 추적 정밀도는 1"이하)의 구동 성능을 가진다. 제어용 컨트롤 시스템은 JTCS(Justek Telescope Control System)를 사용한다. 성능 평가를 위해 시험 관측된 10~13등급 사이 10개의 별들에 대한 FWHM 측정결과는 4~5" 범위에 있다. 앞으로 지속적인 성능 평가와 업그레이드를 통해 향후 정밀도를 높여 학술 연구용으로 공개할 예정이다. 이번 국립대구과학관 1m 주망원경의 도입으로 지역 천문교육 프로그램이 한 단계 더 도약할 수 있을 것으로 기대한다.

• Journal of the Korean earth science society
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• v.40 no.1
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• pp.86-106
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• 2019

The purpose of this study is to develop an astronomy education program reflecting astronomical thinking to be used at science museum and to investigate the effect of the program on the improvement of astronomical thinking ability of high school students. After selecting the components of astronomical thinking through literature studies, we developed an astronomy education program consisting of four stages: demonstration and observation, and question and thinking, support and group discussion, demonstration and assessment. In order to verify the effectiveness of the program, we conducted a covariance analysis on the pre- and post-tests of the experimental group and control group to examine the level of students' thinking before and after using the program in teaching and learning. As a result, it was confirmed that the astronomy education program reflecting astronomical thinking was effective in promoting students' astronomical thinking ability. In particular, this program was effective in enhancing the ability of modeling by reconstructing the observed astronomical phenomenon from the viewpoint of the universe with respect to spatial thinking in the astronomy domain. It was also effective to improve the ability of organizing the system by grasping the relationship between the elements constituting the astronomical system in relation to the system thinking in the astronomy domain. This study is significant in suggesting a specific teaching and learning program to develop students' astronomical thinking.

• Journal of the Institute of Convergence Signal Processing
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• v.16 no.4
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• pp.162-167
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• 2015

This paper describes the reason and the problem solving for the double-layer pattern of a Daejeon correlator operated in Korea-Japan Correlation Center. When the electric power of an input signal in the correlator is charged small enough to be buried in the noise, it is hard to see a signal with a specific pattern in the input signal, but when the electric power is large, a specific one is reported to be seen. By comparing data from observation with one from software correlator, it was confirmed from the analysis using the AIPS software that the amplitude gain of a source signal was affected about 3%. Therefore, in order to solve the problem of double-layer patterns, we found that a problem in the memory management module responsible for both the data input and the data serialization of the correlator is a cause for the double-layer pattern detected periodically. In other words, while data is serialized and read repeatedly in the memory area assigned to serialize the data from the serialization module, redundant last data is generated and an overlap for the memory allocation is occurred. Therefore, by modifying the program of the FPGA memory sections on serialization module to correct the problem, we confirmed that double-layer pattern is disappeared and correlation results are normally acquired.

• Journal of The Korean Association For Science Education
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• v.41 no.6
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• pp.441-454
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• 2021

In this study, we propose the composition of contents on the area of astronomy for high school Earth Science elective courses for the 2022 revised curriculum based on high school students' perceptions of changes in Earth Science core concepts over the curriculum revisions, and analysis of learning elements in the area of astronomy for domestic and foreign Earth Science curriculum. Four Earth Science education experts compared and analyzed the astronomy contents presented in Korea, the US, British Columbia (BC) in Canada, Japan, and the International Baccalaureate Diploma Program (IBDP) curriculum. According to the survey results, high school students who answered that they were most interested in the core concepts of astronomy expressed a lot of regret that the contents related to astronomical observation were eliminated from the 2015 revised curriculum. As a result of comparing domestic and foreign curriculum, Korea and IBDP curriculum dealt with the largest amount of learning elements in astronomy. In the case of BC in Canada and IBDP, astronomy was offered as an independent subject, and the curriculums of Japan and Korea dealt with astronomy in the Earth Science subject. According to the results, it is necessary to develop general elective courses in Earth Science with astronomy-related contents with high discriminating power in order to strengthen astronomy education. Since astronomy requires background knowledge from various disciplines and inter-disciplinary learning was required, it is necessary to organize the career-related elective courses in Earth Science so that astronomy can be dealt with according to the knowledge structure of general Astronomy. Based on the research results, ways to organize astronomy contents for Earth Science elective courses were suggested.