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    Origin of the Korean Screen Planisphere with both Old and New Star-charts

    Ahn, Sang-Hyeon
    천문학회보 = The Bulletin of the Korean astronomical society, 2014, Vol.39(1), pp.85.2-85.2
    KISTI (Korea Science Collection)
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    Title: Origin of the Korean Screen Planisphere with both Old and New Star-charts
    Author: Ahn, Sang-Hyeon
    Description: The origin of the Korean Screen Planisphere with both Traditional and New Star-Charts, made by Korean Astronomers in the Royal Astronomical Bureau of the Joseon Dynasty by adopting the knowledge of the European astronomy, is investigated by analyzing its inscriptions and star charts. The considerations on both the changes in notations or representations of names of asterisms and the naming taboos used in the Old-style planisphere imply that the star-chart is originated from either the Sukjong-Stele-Replica of Cheonsang-Yeolcha-Punyajido(天象列次分野之圖). The New style planisphere is just the reproduction of Huangdao-congxingtu (黃道總星圖), with the exception of the non-Chinese-traditional stars. The Huangdao-congxingtu was made in 1723 CE by Ignatius K$\ddot{o}$gler who was a Jesuit missionary and worked for the Bureau of Astronomy (欽天監) in the Qing Dyansty. I find that the star chart was imported in 1742 CE from the Qing by An Gukrin (安國麟) who was an astronomer in the Royal Astronomical Bureau of Joseon. The chart became model for the screen star-chart made in 1743 CE and now housed in Bopju temple. I found that the inscriptions are extracted from the sentences in both Xinzhi Lingtai Yixiangzhi (新製靈臺儀象志) and Qinding Yixiangkaocheng (欽定儀象考成). Korean historical records in either Daily Records of the Royal Secretariat of the Joseon Dynasty (承政院日記) or Annals of the Joseonn Dynasty (朝鮮王朝實錄) show that Xinzhi Lingtai-Yixiangzhi was imported from the Qing Dynasty in 1708 CE, and the Qinding Yixiangkaocheng was imported in 1766 CE. Thus, the Korean Screen Planisphere with both Old and New Star-charts was certainly made after 1766 CE.
    Is part of: 천문학회보 = The Bulletin of the Korean astronomical society, 2014, Vol.39(1), pp.85.2-85.2
    Identifier: 1226-2692 (ISSN)

    • Several versions

    Tongue Volume Influences Lowest Oxygen Saturation but Not Apnea-Hypopnea Index in Obstructive Sleep Apnea (Tongue Volume in Obstructive Sleep Apnea)

    Ahn, Sang Hyeon, Kim, Jinna, Min, Hyun Jin, Chung, Hyo Jin, Hong, Jae Min, Lee, Jeung-Gweon, Kim, Chang-Hoon, Cho, Hyung-Ju
    2015, Vol.10(8), p.e0135796 [Peer Reviewed Journal]

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    신도 보천가(步天歌)와 협기변방서(協紀辨方書)

    Ahn, Sang-Hyeon
    천문학회보 = The Bulletin of the Korean astronomical society, 2015, Vol.40(1), pp.69.3-69.3
    KISTI (Korea Science Collection)
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    Title: 신도 보천가(步天歌)와 협기변방서(協紀辨方書)
    Author: Ahn, Sang-Hyeon
    Description: 조선 후기의 천문학자 김영(金泳)이 편집하여 1792년에 관상감에서 출간한 신도(新圖) "보천가(步天歌)"는 조선 초기의 "보천가"에서 왕희명(王希明)의 가결을 가져오고, 성도와 주석은 페르디난드 페르비스트의 영향을 받았다고 알려져 있다. 본 논문에서는 1741년에 청(淸)에서 출간된 "협기변방서(協紀辨方書)"에 들어있는 "성도보천가(星圖步天歌)"의 내용과 신도 "보천가"의 내용을 서로 비교하였다. 또한 "협기변방서"의 조선 전래에 관한 역사적 상황을 정리하였다. 이러한 논의를 통해, 김영의 "보천가"는 1741년에 청에서 출간되어 1742년에 조선으로 수입된 "협기변방서"의 "성도보천가"에서 주석과 성도를 취하고, 조선 초기에 간행된 "보천가"에서 가결을 취하여 이룩된 것이라는 결론을 얻었다.
    Is part of: 천문학회보 = The Bulletin of the Korean astronomical society, 2015, Vol.40(1), pp.69.3-69.3
    Identifier: 1226-2692 (ISSN)

    • Several versions

    The Dimension of Hyoid Bone Is Independently Associated with the Severity of Obstructive Sleep Apnea

    Ha, Jong Gyun, Min, Hyun Jin, Ahn, Sang Hyeon, Kim, Chang-Hoon, Yoon, Joo-Heon, Lee, Jeung-Gweon, Cho, Hyung-Ju
    PLoS ONE, 2013, Vol.8(12) [Peer Reviewed Journal]

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    Geometrical Mind in Sky Charts

    안상현, Ahn, Sang-Hyeon
    천문학회보 = The Bulletin of the Korean astronomical society, 2012, Vol.37(1), pp.52.1-52.1
    KISTI (Korea Science Collection)
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    Title: Geometrical Mind in Sky Charts
    Author: 안상현; Ahn, Sang-Hyeon
    Description: It is often said that there is little geometrical mind in Korean history. However, a method to project the surface of a sphere onto 2-dimensional plain was applied to the representative Korean star chart or Cheonsang Yeolcha Bunyajido (天象列次分野之圖). The method, called the equi-distant polar projection, was explained in detail in ancient Chinese history book of the Tang dynasty, which was originated from older history. Another method of the Mercator projection was introduced by the famous engineer Su Song (蘇頌) of the Song dynasty. The description has quite geometrical thoughts, especially the concept of infinity or convergence appears, However, this type of sky projection method was not widely used in east Asia. When the European Jesuits came to China to evangelize the Chinese people, they found that the Chinese people paid much attention to advanced European astronomical knowledge. Thus, they introduced the European astronomical knowledges into China, and the star chart was one of them. The projection method of the new charts were quite different from the Chinese tradition. When the Koreans brought those new star chart from China, they must have known the geometrical description of the method. The method was described in detail in a volume of Chongzhen Lishi (崇禎曆書) or Xiyang Xinfa Lishu (西洋新法曆書). The explanation consists of three part. One is the quantitative way; another is a geometrical way using axiomatic systems; and the other is the practical method to draw star chart with the geometical projection. However, when we see the Honcheon Jeondo (渾天全圖) that is thought to be duplicated by Kim Jeongho (金正浩), the new geometrical method was not so widely known to the Koreans. I will discuss the reason why the geometrical minds have not been widely adopted in the Korean civilization.
    Is part of: 천문학회보 = The Bulletin of the Korean astronomical society, 2012, Vol.37(1), pp.52.1-52.1
    Identifier: 1226-2692 (ISSN)

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    김영(金泳)과 1792년에 출간된 새로운 『보천가(步天歌)』

    안상현, Ahn, Sang-Hyeon
    천문학논총 = Publications of the Korean Astronomical Society, 2011, Vol.26(4), pp.147-157
    KISTI (Korea Science Collection)
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    Title: 김영(金泳)과 1792년에 출간된 새로운 『보천가(步天歌)』
    Author: 안상현; Ahn, Sang-Hyeon
    Subject: Historical Astronomy ; Poch' $\Breve{O}$N'Ga ; Bu-Tian-Ge ; Star Charts ; Kim Y $\Breve{O}$Ng
    Description: I found evidence that Kim Y$\breve{o}$ng (金泳, 1749-1817) is the author of the Korean Poch'$\breve{o}$n'ga with New Charts published in 1792 by the Astronomical Bureau of the Chos$\breve{o}$n dynasty. I reconstructed a history of Kim Y$\breve{o}$ng from various literature remained in other persons' anthologies and governmental records. My findings on the author and publication year can help to solve the problem on the origin of star charts in the Poch'$\breve{o}$n'ga with New Charts. I also considered the changes of Chinese Bu-Tian-Ge and their star charts after Chongzhenglishu (崇禎曆書). I found that the new charts in the book of Huantiantushuo published by Li Mingche (李明徹, 1751-1832) in 1819 are approximately the same to those in the Poch'$\breve{o}$n'ga with New Charts by Kim Y$\breve{o}$ng in 1792.
    Is part of: 천문학논총 = Publications of the Korean Astronomical Society, 2011, Vol.26(4), pp.147-157
    Identifier: 1225-1534 (ISSN)

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    Two cases of malleostapedotomy in congenital oval window atresia

    Ahn, Sang Hyeon, Kim, Da Hee, Choi, Jae Young, Kim, Bo Gyung
    Korean journal of audiology, December 2013, Vol.17(3), pp.152-5 [Peer Reviewed Journal]
    MEDLINE/PubMed (U.S. National Library of Medicine)
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    Title: Two cases of malleostapedotomy in congenital oval window atresia
    Author: Ahn, Sang Hyeon; Kim, Da Hee; Choi, Jae Young; Kim, Bo Gyung
    Subject: Aural Atresia ; Conductive Hearing Loss ; Stapes Surgery
    Description: Congenital anomaly of the oval window with an abnormal facial nerve course is an uncommon embryological defect, which is related to the underdevelopment of second branchial arch derivatives. Some treatments for improving hearing levels are available; these include hearing aids, vestibulotomy, neo-oval window formation, and stapes surgeries, including incudostapedotomy and malleostapedotomy. However, surgery for congenital anomalies of the oval window has rarely been described, usually in very small series of patients. We describe two cases of congenital anomalies of the oval window with aberrant facial nerve courses. One was a 40-year-old male diagnosed with unilateral congenital oval window atresia; the other was a 10-year-old male diagnosed with bilateral congenital oval window atresia. We also describe the clinical manifestations and treatment outcomes of malleostapedotomy for congenital anomalies of the oval window with aberrant facial nerve courses.
    Is part of: Korean journal of audiology, December 2013, Vol.17(3), pp.152-5
    Identifier: 2092-9862 (ISSN); 24653925 Version (PMID); 10.7874/kja.2013.17.3.152 (DOI)

    • Several versions

    Rotational Disruption of Dust Grains by Radiative Torques in Strong Radiation Fields

    Hoang, Thiem, Tram, Le Ngoc, Lee, Hyeseung, Ahn, Sang-Hyeon
    Nature Astronomy, 2019 [Peer Reviewed Journal]

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    고대중국(古代中國)의 이십팔숙거성(二十八宿距星)들의 좌표값

    안상현, Ahn, Sang-Hyeon
    천문학논총 = Publications of the Korean Astronomical Society, 2010, Vol.25(4), pp.155-165
    KISTI (Korea Science Collection)
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    Title: 고대중국(古代中國)의 이십팔숙거성(二十八宿距星)들의 좌표값
    Author: 안상현; Ahn, Sang-Hyeon
    Subject: Historical Astronomy ; Lunar Lodges ; Determinative Stars ; Equatorial Lodge Degrees ; Polar Distance Degrees ; Shi Shi Xuan Jing ; Yixing
    Description: In this study, we investigate the changes in the equatorial lodge degrees and polar distance degrees of determinative stars in the ancient Chinese archives. Confirmed is the fact that the coordinate values of those determinative stars defined in B.C. 104 had been used until the 8th century but were modified by the observations of Li Chunfeng (李淳風) in the early 7th century and Yixing (一行) in 723 A.D. The results of this study are compared with those in History of Chinese Astronomical Observations of Pan Nai. By applying the results of comtemporary astrodynamical calculations, their reliability is checked, and the corrected catalogues of Shi Shi (石氏) and Yixing are provided. The positional accuracy of those observations is estimated to be one degree.
    Is part of: 천문학논총 = Publications of the Korean Astronomical Society, 2010, Vol.25(4), pp.155-165
    Identifier: 1225-1534 (ISSN)

    • Several versions

    Broad Wings around H$\alpha$ and H$\beta$ in the Two S-Type Symbiotic Stars Z Andromedae and AG Draconis

    Chang, Seok-Jun, Lee, Hee-Won, Lee, Ho-Gyu, Hwang, Narae, Ahn, Sang-Hyeon, Park, Byeong-Gon