• Title/Summary/Keyword: 은하

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Light Curve Analyses of the Eclipsing Binary EROS 1010 in the Large Magellanic Cloud (대마젤란은하 식쌍성 EROS 1010의 광도곡선 분석)

  • Hong, Kyeong-Soo;Kang, Young-Woon
    • Journal of Astronomy and Space Sciences
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    • v.26 no.3
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    • pp.295-304
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    • 2009
  • We present BV light curves of EROS 1010 which is located in the central bar of the Large Magellanic Cloud. The BV light curves including BR and I light curves observed by the EROS and OGLE projects, have been analyzed using the 2005 version of the Wilson & Devinney Differential Correction program for the photometric solutions. The absolute dimensions of EROS 1010 were calculated by adopting the distance modulus of the Large Magellanic Cloud, $m-M=18.^m3{\sim}18.^m5$.

A Study on the Expansional Aspects and Supporting Schemes of Scenario (시나리오의 확장 양상과 지원 방안에 관한 연구)

  • Lee Chang-Jo;Kim Yong-Do
    • Journal of Game and Entertainment
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    • v.2 no.1
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    • pp.56-63
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    • 2006
  • It is handled here in this paper, the orality and literacy of scenario, as a basic study for the expansional aspects of scenario at first. And next, it is grasped the specialness and potential energy of scenario checking various matter of Gutenberg Galaxy provided as a literal civilization. Further, basing on the former, various peculiarities of scenario have been linked to the digital storytelling of the internet basic and image writing of visual culture, and the various supporting schemes for new scenario format and creative circumstances in order to build the importance and the ranking of scenario have been presented in the era of the digital image contents. After all, the intention of this study particularly is to lay great emphasis on the supporting schemes and Scenario Galaxy such as a specialized graduate school and national story & scenario agency from a national point of view.

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$4^{th}$ K-GMT Summer School - Seeking Answers to Open Questions (제4회 거대마젤란망원경 여름학교 - 의문들에 대한 해답을 찾아서)

  • Lee, Joon Hyeop;Hwang, Narae;Park, Byeong-Gon;Kim, Yee Jin;Lee, Jae-Joon;Lee, Ho-Gyu;Kim, Minjin
    • The Bulletin of The Korean Astronomical Society
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    • v.39 no.2
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    • pp.122.1-122.1
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    • 2014
  • 다가오는 거대마젤란망원경 (GMT) 시대를 이끌어갈 신진 연구자들의 연구역량 증진을 위해, 2014년 8월 25일부터 29일까지 4박5일에 걸쳐 경상북도 경주시 대명리조트에서 제4회 거대마젤란망원경 여름학교를 개최하였다. 총 40명이 학생으로서 참가한 이번 여름학교에서는 다음과 같은 두 가지 새로운 프로그램이 시도되었다. (1) 관측천문학의 기초, 우리은하 천문학의 기초, 외부은하 천문학의 기초 등 세 번의 기초강의를 선택적으로 제공하였다. (2) 별과 행성, 항성종족과 화학진화, 은하 형성, 고적색이동 천체와 재이온화, 우주론 등 총 다섯 개 분야에서 심화강의를 제공한 뒤에 각 강의내용과 연관된 열린 질문들을 화두로 해서 학생들 간에 조별 토론을 진행하였다. 이는 정해진 답이 없는 문제를 놓고 토론을 통해 능동적으로 답을 찾아가는 과정을 훈련하기 위해 고안된 것이다. 본 포스터에서는 제4회 거대마젤란망원경 여름학교의 결과를 정리하고 앞으로 나아갈 GMT 계절학교의 방향을 점검해본다.

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K-GMT 과학연구

  • Gyeong, Jae-Man;Kim, Sang-Cheol;Seon, Gwang-Il;Lee, Chang-Hui;Lee, Jun-Hyeop;Lee, Jae-Jun;Sin, Jong-Ho;Seong, Eon-Chang;Kim, Min-Jin;Lee, Jong-Cheol;Park, Byeong-Gon;Kim, Yeong-Su;Cheon, Mu-Yeong
    • The Bulletin of The Korean Astronomical Society
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    • v.37 no.1
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    • pp.63.2-63.2
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    • 2012
  • 한국천문연구원의 대형광학망원경 개발사업(K-GMT)의 세 가지 세부 목표 중 GMT 망원경 건설 후 GMT 망원경 활용 극대화가 그 하나이며 이 목표를 달성하기 위한 두 부류의 큰 활동이 이루어지고 있다. 첫째, 국내 전문가로 구성된 과학.기기 워킹그룹(Science Instrument Working Group)은 한국천문학계 연구역량강화 프로그램을 준비하고 시행하고 있으며 2012년 K-GMT 여름학교를 개최할 예정이다. 둘째, 천문연은 2개의 핵심연구주제를 선정하고 2011년부터 학계와 공동으로 pilot 연구를 수행하고 있다. 이 학연공동연구에서는 AAT를 이용한 남반구 별탄생영역 관측, CFHT를 이용한 은하단/은하군 관측을 수행하였고 2012년엔 UKIRT 망원경을 이용하여 우리은하평면의 [FeII] 서베이 관측 등을 수행할 계획이다.

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Constraining Dust Properties of high-z Lyα Emitters using the ALMA Archive

  • Moon, Byeongha;Yang, Yujin;Oh, Suyeon
    • The Bulletin of The Korean Astronomical Society
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    • v.42 no.2
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    • pp.73.2-73.2
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    • 2017
  • 고적색편이의 $Ly{\alpha}$ 방출은하($Ly{\alpha}$ emitter; LAE)는 UV 연속복사에 비해 강한 $Ly{\alpha}$ 방출선을 내는 천체로서 매우 젊고, 낮은 금속함량을 가진 원시은하이다. LAE의 강한 $Ly{\alpha}$ 방출선은 먼지가 매우 적기 때문에 소광이 거의 없이 은하에서 탈출하거나, 먼지의 국지적인 분포 때문에 나타나는 것으로 추정된다. 그러나 기존 전파관측 시설의 낮은 감도 때문에 LAE의 먼지성분은 잘 알려져 있지 않다. 우리는 Atacama Large Millimeter/Submillimeter Array (ALMA)에 의해 우연히 관측된 LAE을 찾아 먼지연속복사를 직접적으로 검출하는 시도를 해 보았다. COSMOS와 ECDFS 영역에서 발견된 약 954개의 LAE 중에서 총 38개가 ALMA로 관측된 영역에 우연히 위치한다는 것을 발견하였고, 이 중 18개의 LAE에 대해 ALMA 관측영상을 모두 더하는 방법(image stacking)을 이용하여, LAE에서 방출되는 먼지연속복사의 상한선을 결정하였다: S(0.50-0.67mm) < $63.2{\mu}Jy$, S(0.21-0.38mm) < $46.7{\mu}Jy$. 본 연구에서는 비록 직접적인 검출에는 실패하였으나, 주어진 LAE 샘플에 대한 ALMA archive 검색, 원자료 다운로드, 영상 만들기, 이미지 합침 과정을 자동화하는 Python 파이프라인을 완성하였다. 이 자동화된 과정을 이용하면, 앞으로 ALMA archive가 늘어남에 따라 감도가 높아진 실험을 쉽게 반복할 수 있을 것으로 기대된다.

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Importance of subgingival contour of anterior mandibular region with narrow space (공간이 협소한 하악 전치부에서 치은하 형태(Subgingival contour)의 중요성)

  • Jungsam, Lee
    • Journal of the Korean Academy of Esthetic Dentistry
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    • v.31 no.1
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    • pp.4-10
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    • 2022
  • A lack of space can be a key challenge when restoring lower anterior teeth using implants, especially for proper implant placement and the limitation on suitable implant selections. Moreover, depending on the shape of the prosthetic, the adjacent teeth and bone around the implant can also have a significant impact, while in certain cases, the implant can have a detrimental effect on the surrounding bone. Therefore, this case series highlights how variations in the subgingival contour can produce different results for the biology of the marginal bone around an implant and the interproximal bone of the adjacent teeth.

Changes in Antioxidant and Antioxidant Enzymes Activities of Soybean Leaves Subjected to Water Stress (대두에서 수분스트레스에 의한 항산화제와 항산화효소의 활성도 변화)

  • Kang, Sang-Jae;Park, Woo-Churl;Kim, Tae-Sung
    • Applied Biological Chemistry
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    • v.42 no.3
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    • pp.246-251
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    • 1999
  • This experiment was carried out to elucidate and investigate the changes in the content of antioxidants and the activities of antioxidant enzymes in the leaves of soybean subjected to water stresses. The results obtained were as follows; Leaves of soybeans subjected to water stresses have showed the differences in the activities of the antioxidant enzymes. In eunhakong, the activity of APOX was increased within a few days, but that of GR was decreased, whereas the activities of APOX and GR were gradually decreased in eunhakong. The activity of MDHAR of the leaves of eunhakong subjected to drought stress was gradually increased within 4days, whereas that of flooding was increased within 2days. We are supposed that the activities of APOX and MDHAR are coupled to maintain ascorbate concentration. In eunhakong, the relative activity of DHAR subjected to flooding was higher than that of drought. These results imply that DHAR is the only enzyme participating in the regeneration of ascorbate when the activity of MDHAR was limited by the deficiency of NADPH. The contents of ascorbate and reduced glutathione subjected to drought stress decreased continually, whereas those subjected to flooding stress recovered after five days of treatment.

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Ozone-induced Alterations in the Activities of Enzymes in Soybean Leaves (대두에서 오존처리에 의한 몇가지 효소의 활성도 변화)

  • Kang, Sang-Jae;Park, Woo-Churl;Kim, Bok-Jin
    • Korean Journal of Environmental Agriculture
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    • v.18 no.3
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    • pp.259-264
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    • 1999
  • This experiment was carried out to investigate the changes of antioxidant enzymes activities in soybean leaves, exposed to 0.2ppm of ozone. We have investigated whether Eunhakong and Samnamkong may scavenge ozone induced activated oxygen species by invoking antioxidant enzymes such as ascorbate peroxidase(APOX), glutathione reductase(GR), monodehydroascorbate reductase(MDHAR), dehydroascorbate reductase(DHAR). Ozone exposure preferentially increased APOX, GR and MDHAR activities, whereas that of DHAR only decreased slowly. When soybean plans were fumigated with 0.2ppm of ozone, the levels of ascorbate and reduced glutathione decreased within a few hours. In eunhakong, which has, slightly a strong tolerance to ozone, was found to have higher antioxidants levels than samnamkong. However, there was no remarkable difference two cultivars in the activities of enzymes which protect plant against active oxygen species.

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Effects of Food Additive Acetic Acids and Propionic Acids on Growth and Morphological Characters of Soybean Sprouts (식품첨가물 Acetic Acid와 Propionic Acid 처리농도에 따른 콩나물의 생장과 형태 변화)

  • Hong, Dong-Oh;Jeon, Seung-Ho;Jeon, Byong-Sam;Lee, Chang-Woo;Kim, Hong-Young;Kang, Jin-Ho
    • Korean Journal of Plant Resources
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    • v.19 no.5
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    • pp.606-611
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    • 2006
  • Decay during soybean sprout culture detracts their quality as well as increases their production costs. This study was done to determine the effects of acetic and propionic acids on growth and morphological characters of the sprouts. The soybean seeds of 3 cultivars (cv. Eunhakong, Pungsannamulkong and Orialtae) imbibed for 2 minutes at their different concentrations (0, 0.1 and 0.2%) were soaked for 6 hours in 4 ppm BA solution after the first 5.5 hour water imbibition and 0.5 hour aeration, and cultured at $20^{\circ}C$. On the 6th day, harvested soybean sprouts were classified into 4 categories on the base of hypocotyl length;>7cm, 4 to 7cm,<4cm and not germinated, and their morphological characters, fresh weights, lesion spots on cotyledons were measured or analyzed. The stronger concentration the higher rate of longer than 4cm although there was no significant difference between the two acids. Pungsannamulkong showed the longest hypocotyls but Eunhakong did the thickest ones, and Orialtae did the greatest total fresh weight, in which all the characters were not influenced by the two acids and their concentrations. Lesion spots on the cotyledons were equal to the two acids although less in their treatments than in no treatment. Utilization of propionic acid was more desirable Dan acetic acid through their treatment cost analysis.