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초고해상도 영상 복원을 위한 Preconditioned Conjugate Gradient 최적화 기법
이은성,김정태,Lee Eun-Sung,Kim Jeong-Tae 한국통신학회 2006 韓國通信學會論文誌 Vol.31 No.8C
본 논문에서는 초고해상도 영상을 복원하기 위한 최적화 기법으로 널리 사용되는 PCG(Preconditioned Conjugate Gradient) 기법을 위한 새로운 preconditioner를 제안하였다. 제안된 preconditioner는 기존의 블록 circulant preconditioner를 확장하여 roughness 벌칙 함수에 대해서 효과적인 수렴이 가능하도록 한 것으로써, 잡음에 민감한 기존 방법의 성능을 개선할 수 있는 것이다. 제안된 preconditioner의 성능을 확인하기 위한 실험과 시뮬레이션에서 제안된 PCG 방법은 기존 방법보다 우수한 수렴 속도를 보였다. We proposed a novel preconditioner based PCG(Preconditioned Conjugate Gradient) method for super resolution image reconstruction. Compared with the conventional block circulant type preconditioner, the proposed preconditioner can be more effectively applied for objective functions that include roughness penalty functions. The effectiveness of the proposed method was shown by simulations and experiments.
절기(節氣)와 역일(曆日)에 대한 일진(日辰)의 복귀주기(復歸週期)
이은성,Lee, Eun-Sung 한국천문학회 1977 Journal of The Korean Astronomical Society Vol.10 No.1
일진(日辰)의 중국역(中國曆)에서 매우 긴요하게 사용(使用)되고 있다. 이 논문(論文)에서는 (1) 103태양년(太陽年)을 지나면 절기(節氣)에 대하여 일진(日辰)이 되돌아오고, (2) 124년(年)을 지나면 음력일(陰曆日)에 대하여 일진(日辰)이 복소되는 것을 보여주었고, 이와 아울러 (3) 62태양(太陽)마다 월(月)의 대소(大小)가 되풀어 된 것은 것을 발견하였다. 이것들은 태음태양력(太陰太陽曆)에서 메톤 주기에 못하지 않는 흥미 있는 주기(週期)이다. Il-Cohin of the 24 subseasons is found to be repeated in the period ut 103, solar yeors. And that of the date in the old Chinese calendar xear is, repeating in the period of 102 solar years. It is also found that the length of lunar month is repeating in nearly 64solar years.
초차법(招差法)과 고대역법(古代曆法)에서의 그 응용(應用)
이은성,Lee, Eun-Sung 한국천문학회 1974 Journal of The Korean Astronomical Society Vol.7 No.1
The interpolation formula Chao-ch'a-shn devised for the Chinese calendar, Shou-shih-li, has been shown as the one of the 3rd order polynomial. Its 3 coefficients have been determined from the table of the Sun in Shou-shih-li. Its applications to the moon and planets are also briefly mentioned.
십이직(十二直)의 천문학적(天文學的) 의의(意義)와 역일(曆日)에의 장기적(長期的)인 배당방법(配當方法)에 관(關)하여
이은성,Lee, Eun-Sung 한국천문학회 1978 Journal of The Korean Astronomical Society Vol.11 No.1
Twelve Chih was sasigned to each day in the old Chinese calendar. This paper clarifres the relations between 12 Chih and the diurnal motion of Big Dipper or the clock, and it shows the long term table and formula for the dayly assignment of 12 Chih in the calendar.
기체 에틸렌/산소 Tri-arc 회전 데토네이션 엔진 실험연구
이은성(Eun Sung Lee),한형석(Hyung-Seok Han),최정열(Jeong-Yeol Choi) 한국추진공학회 2021 한국추진공학회지 Vol.25 No.1
In rotating detonation engine(RDE), only the detonation wave is moving around the outer wall of the combustor. Neither a mechanical part nor flow is rotating in RDE. Thus, the RDE cross section is not necessary to be circular, but arbitrary closed section is possible. A RDE of tri-arc cross section is designed and As an example of an arbitrary cross sectioned RDE, a RDE of tri-arc cross section is designed in this study, and operational and performance characteristics were examined experimentally. The rotation of the detonation wave is confirmed by dynamic pressure sensor and high-speed camera, while the characteristics of the detonation wave were investigated at the concave and convex surfaces. In the present study, the thrust level of 17.0 N to 96.0 N was obtained depending on the mass flow rate.
지방컨벤션센터의 운영현황과 발전방향에 대한 연구: 창원컨벤션센터(CECO)를 중심으로
이은성 ( Eun Sung Lee ) (사)한국마이스관광학회(구 한국컨벤션학회) 2009 MICE관광연구 Vol.9 No.3
Changwon Exhibition Convention Center (CECO) which lies in Changwon city, the hub of shipbuilding, aerospace, robotics, and mechanical industry in Korea and advocating the eco-capital, was established in September 2005 as a joint venture between Gyeongsangnam-do and Changwon city. Since its opening, CECO, a high-tech convention and exhibition facilities, holds about 3,500 events such as conventions, exhibitions, corporate events and various cultural events, and now is trying to develop as a MICE hub for industrial and environmental sectors with the slogan `The Communication Factory`. In order to continuous growth, CECO has to establish a long-term goal and, with this goal, the exhibitions are being held have to be full-scale review. Second, investment on the exhibitions which are coincide with the development policies and objectives of the regional industry and have the potential for future growth should be actively enforced. Third, in terms of conventions, inducing and holding of the conferences, specialized and related industries in the region, should be more active. Fourth, development and continuos cultivation of self-organizing conferences are needed.