• 한국콘텐츠학회논문지
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• 제19권11호
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• pp.178-189
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• 2019

본 논문은 C. P. E. 바흐의 연구에서 심도 있게 다루어지지 않은 그의 푸가를 재평가하는 것에 목적이 있다. 푸가는 대위적인 음악 가운데 짜임새가 가장 정교한 음악으로 흔히 대조적 성격의 즉흥적 프렐류드나 판타지아와 한 쌍으로 이루어져 있기도 하다. C. P. E. 바흐는 여기서 한 걸음 더 나아가 두 악곡을 나란히 배치하는 것이 아니라 이 두 장르를 하나의 음악으로 융합시키고자 하였다. 푸가의 기본 개념과 전형적인 형식적 틀은 느슨하게 유지되고 있는 가운데 주제의 특징과 세부진행에서 그가 즉흥연주기법으로 피력한 바 있는 양식적 특징이 비중 있게 결합 되어있는 것이다. 본고는 C. P. E. 바흐 건반 푸가 전곡(7곡)의 분석을 통해 그가 추구한 즉흥연주기법과의 결합을 고찰한다.

• 천문학회보
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• 제46권1호
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• pp.45.2-46
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• 2021

The Hayabusa 2 mission target asteroid (162173) Ryugu is a near-Earth, carbonaceous (C-type) asteroid. Before the arrival, this asteroid is expected to be covered with mm- to cm- sized grains through the thermal infrared observations [1]. These grains are widely understood to be formed by past impacts with other celestial bodies and fractures induced by thermal fatigue [2]. However, the close-up images by the MASCOT lander showed lumpy boulders but no abundant fine grains [3]. Morota et al. suggested that there would be submillimeter particles on the top of these boulders but not resolved by Hayabusa 2's onboard instruments [4]. Hence, we conducted polarimetry of Ryugu to investigate microscopic grain sizes on its surface. Polarimetry is a powerful tool to estimate physical properties such as albedo and grain size. Especially, it is known that the maximum polarization degree (Pmax) and the geometric albedo (pV) show an empirical relationship depending on surface grain sizes [5]. We observed Ryugu from UT 2020 November 30 to December 10 at large phase angles (ranging from 78.5 to 89.7 degrees) to derive Pmax. We modified TRIPOL (Triple Range Imager and POLarimeter, [6]) to attach to the 1.8-m telescope at the Bohyunsan Optical Astronomy Observatory (BOAO). With this instrument, we observed the asteroid and determined linear polarization degrees at the Rc-band filter. We obtained sufficient data sets from 7 nights at this observatory to determine the Pmax value, and collaborated with other observatories in Japan (i.e., Hokkaido University, Higashi-Hiroshima, and Nishi-Harima) to acquire linear polarization degrees of the asteroid from total 24 nights observations with large phase angle coverage (From 28 to 104 degrees). The observational results have been published in Kuroda et al. (2021) [7]. We thus found the dominance of submillimeter particles on the surface of Ryugu from the comparison with other meteorite samples from the campaign observation. In this presentation, we report our activity to modify the TRIPOL for the 1.8-m telescope and the polarimetric performance. We also examine the rotational variability of the polarization degree using the TRIPOL data.