간행물
천문학논총 KCI 등재 Publications of the Korean Astronomical Society
- 발행기관 한국천문학회
- 자료유형 학술지
- 간기 연3회
- ISSN 1225-1534 (Print)2287-6936 (Online)
- 수록기간 1984 ~ 2024
- 주제분류 자연과학 > 천문학 자연과학 분류의 다른 간행물
- 십진분류KDC 440DDC 520
권호리스트/논문검색
Volume 31 Issue 2 (2016년 9월) 2건
1.
2016.09
구독 인증기관 무료, 개인회원 유료
This paper presents the results of test observations toward a point source, 4C39.25, for observation modes with various bandwidths and numbers of IF streams in order to examine a reliability of the Daejeon hardware correlator performance for correlating VLBI (Very Long Baseline Interferometry) data obtained with the several observation modes of the KVN (Korean VLBI Network). We used a DiFX software correlator (DiFX) as a reference, for investigating the output visibilities from the Daejeon corelator. It is found that the band shapes of the output visibilities from two correlators are similar to each other and the correlated flux density for each baseline obtained from the Daejeon hardware correlator is lower by 3 - 7% than that from the DiFX. The flux difference is attributed to the limitation of FPGA resources and the difference of fringe rotation algorithm of the Daejeon hardware correlator. The conversion factor, 0.93 ~ 0.97, is proposed for future correlation with the Daejeon hardware correlator.
4,000원
2.
2016.09
구독 인증기관 무료, 개인회원 유료
There were two books on astronomy published in 1908. One is 『Astronomy (天文學)』 written by Jeong, Yeong-Taek (鄭永澤, 1874 ∼ 1948), an educator. The other is 『Introduction to Astronomy (텬문략히)』 written by William Martyn Baird (裵偉良, 1862 ∼ 1931), an American missionary. It was known that these two books were translated into Korean as astronomical textbooks of the Korean Empire. We investigated the life of translators, the motivation of writing textbook, and the translators’ specialty in astronomy. We also compared the two books in terms of content, orthography of terminology, scale of units, and so forth. We suggest that these books were really utilized as textbooks of astronomy in the modern school in the early 20th century in Korea. We also conclude that in astronomy education these two textbooks bridged the gap between the traditional Chinese astronomy of the middle age and modern astronomy from the West.
4,600원
