• The Bulletin of The Korean Astronomical Society
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• v.39 no.1
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• pp.65.2-65.2
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• 2014

태양 빛이 달 표면에서 반사될 때는 일부가 편광 된다. 이러한 월면 편광은 달 표토층 입자의 크기와 성분을 알려주는 중요한 정보이나, 이전의 달 궤도선에서는 한 번도 탐사되지 않았다. 또한 달 탐사임무에 있어 틈새시장인 월면 특이지역 연구에도 편광이 중요한 기초자료를 제공한다는 사실이 최근 밝혀졌다. 이에 본 연구진은 한국형 달 탐사선을 위한 우리나라 고유의 창의적 과학 임무 중 하나로 <월면 다파장 편광 탐사>를 제안하며, 이러한 탐사에 필요한 기초연구 및 선행연구를 수행하고 있다. 본 발표에서는 우리가 수행한 지상으로부터의 다파장 편광 관측 결과를 보고하고, 최근 시작한 랩실험과 컴퓨터 시뮬레이션 실험에 대해 소개할 것이다.

• Journal of the Korean Institute of Educational Facilities
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• v.11 no.2
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• pp.5-16
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• 2004

Auditorium and gymnasium are utilized in rare cases compared to the large spacial size. From Monday to Saturday, the use of them is extremely rare, which shows the serious example of economical inefficiency of architectural space. To solve these problems, inquiries from the various viewpoints will be necessary. Architecture-philosophically, how can space and time considered sufficiently? How is the structure related to phase. The object of this study is to arrange newly economical efficiency of space and time which are treated slightingly as they mentioned above and the plan about the design of the architectural space and multipurpose room.

• Journal of Korean Elementary Science Education
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• v.40 no.1
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• pp.55-65
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• 2021

The purpose of this study was to investigate the effects of application of maker education program in school maker space on the creative problem solving ability and self-directed learning ability of elementary students. For research, we secured 18 periods of creative experience activities with 5 categories appropriate for elementary students, and integrated these activities into an elementary maker education program in school maker space. Pre and post tests were done before and after application of this maker education program to assess the changing in participants' creative problem solving ability and self-directed learning ability. The results of this study can be summarized as follows: First, the maker education program meaningfully improved the creative problem-solving abilities of elementary school students. Second, the maker education program meaningfully improved the self-directed learning abilities of elementary school students. From interview with the students, we could know that this program made the students have self-confidence and gave them favorable impression.

• Journal of the Korean Institute of Educational Facilities
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• v.6 no.4
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• pp.5-15
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• 1999

This study aims to suggest guidelines of open classroom in open elementary school. It consists of following three parts. The first part takes a theoretical review of open education and open classroom. And the second makes analysis of architectural characteristics of open classroom as case studies which are analyzed in terms of modul, function and ratio of open space, etc. The last part is user need analysis of the open space.

• The Bulletin of The Korean Astronomical Society
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• v.38 no.1
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• pp.72.1-72.1
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• 2013

Camera for QUasars in EArly uNiverse (CQUEAN) is an optical CCD camera, developed by Center for Exploration of Origin of the Universe (CEOU), which is now searching for high red shift quasar candidates. It has been operated since 2010, attached to the 2.1m Otto Struve telescope at the McDonald Observatory, USA. Based on the previous operation experiences, we present CQUEAN II system design which has a new filter wheel allowing with 20 narrow band filters. In addition, the auto guiding system will be rearranged and the interfacing units between the telescope and the instrument will become stabilized.

• The Bulletin of The Korean Astronomical Society
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• v.35 no.2
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• pp.48.1-48.1
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• 2010

A numerical simulation study of the solar coronal plasma reveals that a ballooning instability can develop in the course of flux rope merging. When magnetic field lines from different flux ropes reconnect, a new field line connecting farther footpoints is generated. Since the field line length abruptly increases, the field line expands outward. If the plasma beta is low, this expansion takes place more or less evenly over the whole field line. If, on the other hand, the plasma beta is high enough somewhere in this field line, the outward expansion is not even, but is localized as in a bulging balloon. This ballooning section of the magnetic field penetrates out of the overlying field, and eventually the originally underlying field and the overlying field come to interchange their apex positions. This process may explain how a field structure that has stably been confined by an overlying field can occasionally show a localized eruptive behavior.

• The Bulletin of The Korean Astronomical Society
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• v.42 no.2
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• pp.60.1-60.1
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• 2017

In this study we apply Convolution Neural Network(CNN) to solar flare occurrence prediction with various parameter options using the 00:00 UT MDI images from 1996 to 2010 (total 4962 images). We assume that only X, M and C class flares correspond to "flare occurrence" and the others to "non-flare". We have attempted to look for the best options for the models with two CNN pre-trained models (AlexNet and GoogLeNet), by modifying training images and changing hyper parameters. Our major results from this study are as follows. First, the flare occurrence predictions are relatively good with about 80 % accuracies. Second, both flare prediction models based on AlexNet and GoogLeNet have similar results but AlexNet is faster than GoogLeNet. Third, modifying the training images to reduce the projection effect is not effective. Fourth, skill scores of our flare occurrence model are mostly better than those of the previous models.

• The Bulletin of The Korean Astronomical Society
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• v.37 no.2
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• pp.131.1-131.1
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• 2012

We use three-dimensional magnetohydrodynamic (MHD) simulations of flux emergence from solar subsurface to corona. In our previous work, we reported the relation between magnetic-field configuration and the flux expansion factor. Following these results, we investigate where an upflow is generated in an active region and how its location is related to the flux expansion factor. We also derive physical quantities of a real active region from observation data provided by Nobeyama Radioheliograph (NoRH), X-Ray Telescope (XRT), and Extreme Ultraviolet Imaging Spectrometer (EIS) onboard Hinode. These physical quantities are plasma density, temperature and flow. By comparing the simulation result and observational one, we will discuss the properties of the location producing a solar wind.

• Communications of the Korean Mathematical Society
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• v.31 no.3
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• pp.647-656
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• 2016

In this paper, we define the generalized golden shaped hypersurfaces in Lorentz space forms. Based on the classification of proper semi-Riemannian hypersurfaces in semi-Riemannian real space forms, we obtain the whole families of the generalized golden shaped hypersurfaces in Lorentz space forms.

• The Bulletin of The Korean Astronomical Society
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• v.41 no.2
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• pp.36.3-37
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• 2016

ECS(Error Compensation Software)는 알루미늄 자유곡면 반사경의 형상정밀도를 향상시키기 위해 개발된 보정가공 소프트웨어이다. DTM(Diamond Turning Machine)을 이용한 가공공정에서 가공오차의 변화를 쉽게 확인하며 형상을 보정할 수 있도록 설계되었다. 보정가공 공정은 (1) 10차 다항식을 이용하여 표면을 설계한 후 DTM에 입력할 가공경로 계산, (2) DTM에 가공경로를 입력하여 가공, (3) 3차원 초정밀 형상측정 장비로 반사경의 가공오차 분석, (4) 가공오차를 보정하여 새로운 10차 다항식 설계, (5) 보정가공경로 계산 후 재가공으로 이루어진다. 그동안의 공정은 다항식의 설계, 가공경로 계산, 반사경의 가공오차 분석을 위해 다수의 프로그램들을 실행해야만 했다. 본 연구에서는 ECS가 알루미늄 자유곡면 반사경 제작을 위한 통합 보정가공 소프트웨어를 제공하여, 사용자가 작업을 효율적으로 수행하기를 기대한다.