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양희수,채종철,박형민,조규현,김연한,조일현,임은경,Yang, Heesu,Chae, Jongchul,Park, Hyungmin,Maurya, Ram Ajor,Cho, Kyuhyun,Kim, Yeon-Han,Cho, Il-Hyun,Lim, Eun-Kyung 한국천문학회 2012 天文學會報 Vol.37 No.2
We observed an Ellerman bomb(EB) and its associated surge using the Fast Imaging Solar Spectrograph(FISS) and the broadband TiO filter of the 1.6 meter New Solar Telescope at Big Bear Solar Observatory. As is well-known, the EB appears as a feature that is very bright at the far wings of the H alpha line. The lambdameter method applied to these wings indicates that the EB is blue-shifted up to 6km/s in velocity. In the photospheric level below the EB, we see rapidly growing "granule-like" feature. The transverse velocity of the dark lane at the edge of the "granule" increased with time as reached a peak of 6km/s, at the time of the EB's occurrence. The surge was seen in absorption and varied rapidly both in the H alpha and the Ca II 8542 line. It originated from the Ellerman bomb, and was impulsively accelerated to 20km/s toward us(blueshift). Then the velocity of the surge gradually changed from blueshift of 20km/s to redshift of 40km/s. By adopting the cloud model, we estimated the temperature of the surge material at about 27000K and the non-thermal velocity at about 10km/s. Our results shed light on the conventional idea that an EB results from the magnetic reconnection of an emerging flux tube and pre-existing field line.
채종철,박형민,양희수,박영득,조경석,안광수,Chae, Jongchul,Park, Hyungmin,Yang, Heesu,Park, Young-Deuk,Cho, Kyung-Suk,Ahn, Kwangsu,Cao, Wenda 한국천문학회 2012 天文學會報 Vol.37 No.2
The characteristics of Doppler shifts in a quiet region of the Sun are investigated by comparing between the $H{\alpha}$ line and the Caii infrared line at 854.2 nm. A small area of $16^{\prime\prime}{\times}40^{\prime\prime}$ was observed for about half an hour with the Fast Imaging Solar Spectrograph (FISS) of the 1.6 meter New Solar Telescope (NST) at Big Bear Solar Observatory. The observed area contains a network region and an internetwork region, and identified in the network region are $H{\alpha}$ fibrils, Caii fibrils and bright points. We infer the Doppler velocity from each line profile at a point with the lambdameter method as a function of half wavelength separation ${\Delta}{\lambda}$. It is confirmed that the bisector of the spatially-averaged Caii line profile has an inverse C-shape of with a significant peak redshift of +1.8 km/s. In contrast, the bisector of the spatially-averaged $H{\alpha}$ line profile has a different shape; it is almost vertically straight or, if not, has a C-shape with a small peak blueshift of -0.5 km/s. In both the lines, the bisectors of bright network points are much different from those of other features in that they are significantly redshifted not only at the line centers, but also at the wings. We also find that the spatio-temporal fluctuation of Doppler shift inferred from the Caii line is correlated with those of the $H{\alpha}$ line. The strongest correlation occurs in the internework region, and when the inner wings rather than the line centers are used to determine Doppler shift. In this region, the RMS value of Doppler shift fluctuation is the largest at the line center, and monotonically decreases with ${\Delta}{\lambda}$. We discuss the physical implications of our results on the formation of the $H{\alpha}$ line and Caii 854.2 nm line in the quiet region chromosphere.
박형민,채종철,송동욱,양희수,장비호,박영득,나자경,조경석,안광수,Park, Hyungmin,Chae, Jongchul,Song, Donguk,Yang, Heesu,Jang, Bi-Ho,Park, Young-Deuk,Nah, Jakyoung,Cho, Kyung-Suk,Ahn, Kwangsu 한국천문학회 2012 天文學會報 Vol.37 No.2
For the study of fine-scale structure and dynamics in the solar chromosphere, the Fast Imaging Solar Spectrograph (FISS) was installed in 1.6m New Solar Telescope at Big Bear Solar Observatory in 2010. The instrument, installed at a vertical table of the Coude lab, is properly working and producing data for science. From the analysis of the data, however, we noticed that a couple of problems exist that deteriorate image quality : lower light level and poorer resolution of the CaII band data. After several tests, we found that the relay optics at the right position is crucial role for the spatial resolution of raster-scan images. By using resolution target, we re-aligned relay optics and other components of the spectrograph. Here we present the result of optical test and new data taken by the FISS.
Seeking the meaning of quality education: Paradigm changes from the 1960s to the 2010s
Sung-Sang Yoo(유성상),Da Jung Jung(정다정),Heesu Yang(양희수),Esoul Moon(문은솔),Yoonjung Hwang(황윤정) 한국교육개발원 2019 KEDI Journal of Educational Policy Vol.16 No.2
While quality education has regained global attention since the World Education Forum 2015, there is rare agreement on the term “quality education” within the international community, as well as in academia. This study aims to review articles on quality education published in selected academic journals between the 1960s and the 2010s to find a pattern of change in how quality education is defined. Inspired by Tikly and Barrett (2011) and Tikly (2011), this study applies four main discourses — postcolonial, input-output, human rights and social justice — to explore trends in international journal articles on quality education. From the 1960s to the 2010s, the number of published articles on quality education has increased each decade. While the predominance of the input-output approach has continued, our analysis shows that the conceptualization of quality education has diversified since 1960. The human rights approach in quality education studies has steadily increased since 2000, although rarely do studies address the postcolonial approach. Moreover, research embracing the social justice approach noticeably increased in the 2010s. While further rigorous studies are required to analyze why the way we address quality education has changed, we conclude that it has been influenced by diversified multilateralism in the education sector and the varying roles education plays in the changing paradigm of international development. 2015년 세계교육포럼 이후 교육의 질이 전 지구적인 주목을 받게 되었음에도 불구하고, 국제사회뿐 아니라 학술의 장에서도 “교육의 질” 개념에 대한 합의가 이루어지지 않고 있다. 이 연구는 어떻게 교육의 질이 개념화되어왔는지 그 변화의 패턴을 탐색하기 위해 1960년대부터 2010년까지 발행된 교육의 질 관련 학술지 논문을 검토하였다. Tikly와 Barrett (2011) 및 Tikly (2011)의 논의에 기반하여, 이 연구는 교육의 질에 관한 국제 학술지 논문에 네 개의 담론 – 포스트식민주의, 투입산출, 인권, 사회정의 – 을 적용하였다. 1960년대와 2010년대 사이에, 교육의 질에 관한 학술지 논문의 수는 증가하는 경향을 보였다. 투입산출 접근이 미치는 영향이 중요하게 유지되어왔음에도 불구하고, 교육의 질에 대한 개념은 다양화되어 왔다. 포스트식민주의 관점을 취한 연구가 거의 발견되지 않은 한편, 인권 접근을 취하는 연구는 2000년 이후 꾸준히 증가해왔다. 사회정의 접근을 보여주는 연구는 2010년대 이후 의미 있게 증가하고 있다. 교육의 질 개념의 이러한 다변화는 교육 분야 행위자의 다자화와 및 국제개발 담론의 다양화에 기인하는 것으로 분석된다.