• The Bulletin of The Korean Astronomical Society
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• 제39권2호
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• pp.99.1-99.1
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• 2014

달은 global magnetic fields가 존재하지 않으나, 달 표면에 국지적으로 자기장이 존재하며 이러한 현상의 원인은 계속 연구중이다. 달의 자기이상 현상이 나타나는 지역 중 광학적으로 밝고 어두운 패턴이 관측되는 지역을 Swirl이라한다. Mare Crisium ($17.18^{\circ}N$, $59.1^{\circ}E$)은 표면에 2개의 자기이상 지역과 광학적으로 밝은 지역들이 존재하지만, Swirl로 잘 알려진 Reiner Gamma와 같은 지역의 광학적 밝기와 패턴의 차이가 있다. 이를 위해 본 연구에서는 Lunar Prospector (LP) 위성의 magnetometer (MAG) 자료를 이용하여 자기장 분포에 관한 연구 및 Clementine 위성의 UV/VIS 영상자료를 이용하여 광학적 특성 연구를 진행하였다. LP의 MAG 자료는 Mare Cirisium지역의 22.3 km 고도에서 관측된 744개의 자료를 활용하였으며, Clementine의 영상자료는 750 nm, 950 nm의 반사도에 따른 Optical Maturity (OMAT)를 활용하였다. Mare Crisium의 북쪽지역은 자기이상 현상과 OMAT의 고유특성이 동시에 나타나며 이는 swirl과 유사하다. 특히, Mare Cirisum서쪽에 있는 Proclus crater 잔해 일부가 Mare Crisium의 북쪽지역까지 퍼져있어 이와 관련하여 자기장 존재여부에 따른 광학적 특성의 차이점을 조사하였다. 본 논문에서는 Mare Crisium 지역의 Swirl 진위여부를 추론하며, 본 논문에서 이용한 방법의 유용성에 대하여 검증하고자 한다.

• Journal of the Korean Institute of Educational Facilities
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• 제12권3호
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• pp.22-32
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• 2005

This paper is to propose a design possibility that incorporates participatory process and also to emphasize the participatory process applied to the planning of outdoor playground space open to the neighboring community. Community design based on the participation method can be understood as an attitude about a force for change in the creation and management of environments for people who are the major users of them. Planning for outdoor space is an integral part of school education and a vital component of child development. For the design of outdoor space of Samyang Elementary School it first needs to examine the current and emerging needs of students, teachers and parents as community residents through the participatory design method. A series of workshops and interviews are taken to identify dreams and ideal spaces of each group. An assessment of existing school spaces and design possibility of reprogrammed outdoor spaces are proposed to match the major demands of participants. Selected outdoor places are chosen and designed to accommodate options for various play settings and to make the school pleasant places where members of the neighborhood can gather for relaxation in restful surroundings.

• The Bulletin of The Korean Astronomical Society
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• 제37권2호
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• pp.113.2-113.2
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• 2012

An innovative solar observing satellite, Hinode, has successfully observed the detailed evolution of a rapidly developing emerging flux region from the beginning of its appearance at the solar surface. The high spatial and temporal resolution provided by the satellite enables to capture the prominent dynamic processes such as the rotational motion of a polarity region with intense magnetic flux which is reminiscent of a cyclone on the Earth, and a running wave that spreads ahead of this rotating polarity region. This 'solar cyclone' is, on the other hand, generated differently from terrestrial cyclones, and a possible generating mechanism for it is demonstrated with a three-dimensional magnetohydrodynamic simulation of a twisted magnetic flux tube emerging from the solar interior into the solar atmosphere. The simulation shows that the rotational motion is caused by a strong downflow of plasma along the twisted field lines that form a helical pillar standing upright on the Sun.

• The Bulletin of The Korean Astronomical Society
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• 제44권1호
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• pp.52.1-52.1
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• 2019

The Helioseismic and Magnetic Imager (HMI) is the instrument of Solar Dynamics Observatory (SDO) to study the magnetic field and oscillation at the solar surface. The HMI image is not enough to analyze very small magnetic features on solar surface since it has a spatial resolution of one arcsec. Super resolution is a technique that enhances the resolution of a low resolution image. In this study, we use a method for enhancing the solar image resolution using a Deep-learning model which generates a high resolution HMI image from a low resolution HMI image (4 by 4 binning). Deep learning networks try to find the hidden equation between low resolution image and high resolution image from given input and the corresponding output image. In this study, we trained a model based on a very deep residual channel attention networks (RCAN) with HMI images in 2014 and test it with HMI images in 2015. We find that the model achieves high quality results in view of both visual and measures: 31.40 peak signal-to-noise ratio(PSNR), Correlation Coefficient (0.96), Root mean square error (RMSE) is 0.004. This result is much better than the conventional bi-cubic interpolation. We will apply this model to full-resolution SDO/HMI and GST magnetograms.

• The Bulletin of The Korean Astronomical Society
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• 제44권1호
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• pp.81.2-81.2
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• 2019

We develop an image-to-image translation model, which is a popular deep learning method based on conditional Generative Adversarial Networks (cGANs), to generate solar magnetograms and EUV images from sunspot drawings. For this, we train the model using pairs of sunspot drawings from Mount Wilson Observatory (MWO) and their corresponding SDO/HMI magnetograms and SDO/AIA EUV images (512 by 512) from January 2012 to September 2014. We test the model by comparing pairs of actual SDO images (magnetogram and EUV images) and the corresponding AI-generated ones from October to December in 2014. Our results show that bipolar structures and coronal loop structures of AI-generated images are consistent with those of the original ones. We find that their unsigned magnetic fluxes well correlate with those of the original ones with a good correlation coefficient of 0.86. We also obtain pixel-to-pixel correlations EUV images and AI-generated ones. The average correlations of 92 test samples for several SDO lines are very good: 0.88 for AIA 211, 0.87 for AIA 1600 and 0.93 for AIA 1700. These facts imply that AI-generated EUV images quite similar to AIA ones. Applying this model to the Galileo sunspot drawings in 1612, we generate HMI-like magnetograms and AIA-like EUV images of the sunspots. This application will be used to generate solar images using historical sunspot drawings.

• Current Optics and Photonics
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• 제3권5호
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• pp.466-472
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• 2019

A system for continuous-wave coherent Doppler lidar (CW lidar), made up of all-fiber structures and a coaxial transmission telescope, was set up for wind measurement in Hefei (31.84 N, 117.27 E), Anhui province of China. The lidar uses a fiber laser as a light source at a wavelength of $1.55{\mu}m$, and focuses the laser beam on a location 80 m away from the telescope. Using the CW lidar, radial wind measurement was carried out. Subsequently, the spectra of the atmospheric backscattered signal were analyzed. We tested the noise and obtained the lower limit of wind velocity as 0.721 m/s, through the Rayleigh criterion. According to the number of Doppler peaks in the radial wind spectrum, a classification retrieval algorithm (CRA) combining a Gaussian fitting algorithm and a spectral centroid algorithm is designed to estimate wind velocity. Compared to calibrated pulsed coherent wind lidar, the correlation coefficient for the wind velocity is 0.979, with a standard deviation of 0.103 m/s. The results show that CW lidar offers satisfactory performance and the potential for application in wind measurement.

• Journal of Astronomy and Space Sciences
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• 제30권1호
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• pp.25-32
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• 2013

We statistically investigated the properties of low-latitude Pi2 pulsations using Bohyun (BOH, Mlat = $29.8^{\circ}$, L = 1.35) ground magnetometer data in 2008. For this 1-year interval, 582 Pi2 events were identified when BOH was in the nightside from 1800 to 0600 local times. We found the following Pi2 characteristics. (1) The occurrence distribution of Pi2s is relatively constant in local times. (2) The Pi2 frequency varies in local times. That is, Pi2 pulsations in postmidnight sector had higher frequency than in premidnight sector. (3) Pi2 power in premidnight sector is stronger than in postmidnight sector. (4) Pi2 frequency has positive correlation with solar wind speed and AE index. (5) Pi2 power has not a clear correlation with solar wind parameters. This indicates that Pi2 power is not controlled by external sources. (6) It is found that the most probable-time between Pi2 onsets is ${\Delta}t$ ~ 37.5 min: This is interpreted to be the period between Pi2 pulsations when they occur cyclically. We suggest that ${\Delta}t$ ~ 37.5 min is the occurrence rate of reconnection of open field lines in the tail lobe.

• The Bulletin of The Korean Astronomical Society
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• 제34권1호
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• pp.113.1-113.1
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• 2009

• The Journal of Sustainable Design and Educational Environment Research
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• 제16권3호
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• pp.61-68
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• 2017

The purpose of this study is to suggest the necessary measures for the school safety experience education space to provide the elementary school students with the ability to provide safety education through experiences routinely and repeatedly. For this purpose, we investigated the conditions of safety experience in Jeollabuk-do and the case of other cities as a factor for operating the school safety experience educational space. In order to clarify the appropriateness of this, a questionnaire was conducted for the teachers in the local area. As a result of the analysis, it was found that the use of two classrooms in the place and the scale in the operation of the school safety experiential education space should be sought in various places such as hall, multipurpose room, and gymnasium according to the school condition. Experiential areas should be operated by elementary school students customized, but specialized facilities or large scale should be used for professional safety experience facilities. For efficient operation, the base school wanted to be located in a place where accessibility of other school students was easy, and that a school with sufficient space would be selected.

• The Journal of Sustainable Design and Educational Environment Research
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• 제17권1호
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• pp.12-22
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• 2018

The purpose of this study is to suggest a space planning direction that can more effectively support creativity and character education in elementary school. In order to do this, we investigated the current state of space creation and the space utilization of schools that operate creativity and Character Education programs. In addition, we surveyed and analyzed the user satisfaction and demand for school space in terms of creativity and character education. The results of this study are as follows: First, 23 design criteria were drawn for each main space in which creative and character education programs are conducted. Second, we investigated the priority and satisfaction of the space that is frequently used in the school for creativity and personality education. Third, we surveyed the types and priorities of new spaces needed to cultivate students' creativity and character. Fourth, 14 concrete space planning directions for creating creativity and character education were suggested.