• Title/Summary/Keyword: Lee Deok-Seong

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STBL 모형의 모수추정 및 예측방법의 비교

  • Kim, Deok-Gi;Lee, Seong-Deok;Kim, Seong-Su;Lee, Chan-Hui;Lee, Geon-Myeong
    • 한국데이터정보과학회:학술대회논문집
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    • 2006.11a
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    • pp.129-142
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    • 2006

  • 본 논문은 공간시계열자료가 공간의 위치와 시간의 흐름에 따라 동시에 관측되는 분야인 기상, 지질, 천문, 생태, 역학 등에서 아주 넓이 사용되고 있고 그 수요가 점차 증가하는 이 시기에 복잡한 공간시계열 중선형(STBL) 모형에 대한 모수 추정 방법 중 수치 해석적 방법인 Newton-Raphson 방법과 Kalman-Filter 방법을 비교하고, 두 가지 방법에 의한 예측력을 비교하여 보았다.

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LIFE AND ASTRONOMICAL ACTIVITY OF LEE DEOK-SEONG AS AN ASTRONOMER IN THE LATE OF JOSEON DYNASTY (조선후기 천문학자 이덕성의 생애와 천문활동)

  • AHN, YOUNG SOOK;MIHN, BYEONG-HEE;SEO, YOON KYEONG;LEE, KI-WON
    • Publications of The Korean Astronomical Society
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    • v.32 no.2
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    • pp.367-380
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    • 2017

  • The life and astronomical activity of Lee Deok-Seong (李德星, 1720-1794) was studied using various historical sources, including the astronomical almanac, Seungjeongwon-Ilgi (Daily records of Royal Secretariat of Joseon dynasty), and the Gwansang-Gam's logbooks during Joseon dynasty (A.D. 1392-1910). We present the results of the study including the following main findings. First, from the investigation of Lee's family tree, we find that a number of his relatives were also astronomers, notably Samryeok-Gwan (三曆官, the post of calendrical calculation). Second, we find that he took part in the compilation of an annual astronomical almanac over a period of at least 16 years. His major achievements in the astronomy of the Joseon dynasty were to establish a new method of calendar-making calculation and to bring astronomical materials to the Joseon court through a visit to China. The Joseon dynasty enforced the Shixianli (時憲曆, a Chinese calendar made by Adam Shall) in 1654 without fully understanding the calendar. So an astronomer and an envoy were dispatched to China in order to master the intricacies of the calendar and to learn as much of Western science as was available in that time and place. Lee Deok-Seong worked at the Gwansang-Gam (觀象監, Royal Astronomical Bureau) during the reigns of King Yeongjo (英祖) and Jeongjo (正祖). As best as we can ascertain in relation with the calculations in the Shixian calendar, Lee visited China four times. During his trips and interactions, he learned a new method for calendar-making calculations, and introduced many Western-Chinese astronomical books to Joseon academia. Lee greatly improved the accuracy of calendrical calculations, even while simplifying the calculation process. With these achievements, he finally was promoted to the title of Sungrok-Daebu (崇祿大夫), the third highest grade of royal official. In conclusion, history demonstrates that Lee Deok-Seong was one of the most outstanding astronomers in the late-Joseon dynasty.

  • https://doi.org/10.5303/PKAS.2016.32.2.367 인용 PDF KSCI