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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.
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.
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.
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.
이은성 ( Eun Sung Lee ),윤혜진 ( Hye Jin Yoon ) (사)한국마이스관광학회(구 한국컨벤션학회) 2009 MICE관광연구 Vol.9 No.2
Today, the world is suffering from serious environmental problems such as global warming, depletion and pollution of water and air, and devastation of forest. Particularly, the exhibition and convention industry has been considered as a `clean industry`, but these industries also have some aspects which destroy the environment. This study examines the exhibition and convention employees perception on eco-friendly systems and policies, derive important factors on eco-friendly program, and analyze the performance in the field in exhibition and convention. As a result, the exhibition and convention employees have higher perceptions than buyers and/or mediators on environment and its importance. It means that the suppliers, who need to enhance their recognition through the competitive brand image and create the satisfaction of the participants, regard that the eco-friendly policies and the employees` role and activities have high value and those are very important factors. To leap and develop its competitiveness, it implicates that the exhibition and convention industry in Korea needs to change the paradigm to green convention programs.
컨벤션/이벤트학과 학생들의 현장실습 경험에 대한 질적 연구
이은성 ( Eun Sung Lee ) (사)한국마이스관광학회(구 한국컨벤션학회) 2014 MICE관광연구 Vol.14 No.2
The purpose of this study is to understand the experiences in internship training of the students in the convention/event department. After conducting in-depth interviews with the students who have experienced the internship training program, we analyze their statements with Colaizzi``s method, a phenomenological study. The significance of this study is to understand whether there were any changes in the students`` personal perception, social relationship, and/or perception of their major in the process of their internship training. The study will also suggest areas of improvement regarding the program which can be applied to students, internship company, and the department. As a result, two categories, ``experiencing personal perception change,`` and ``experiencing social conflict, and six sub-categories, ``experiencing new environment,`` ``changing personal perception,``,``having opportunity of motivation, ````disappointing on the field,`` and ``understanding the field,`` were found.