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강윤석(Kang Yoon-Suk),김은(Kim Eun),김태욱(Kim Tae-Wook),장승엽(Jang Seung-Yup),나성훈(Na Sung-Hoon) 한국철도학회 2005 한국철도학회 학술발표대회논문집 Vol.- No.-
For the Korean high speed railway rolling stock, which is developed through the G7 research project, various tests such as components test, prototype train test, on-line test have been carried out for years. In order to obtain the system stability, mutual interface between each part (rolling stock, track, bridge, electricity and signal) should be verified. For this reason, track performance according to the speed increase of HSR has been monitored in field. Especially, through the analyses of accumulated data, structural and running stability of HSR has been evaluated. With this viewpoint, this paper presents the track performance test method and the test results corresponding to 350km/h speed increase of HSR.
코어돌출형 지붕을 가진 판상형 배치 아파트의 건물 일조시간 분석방법에 관한 비교 연구
강윤석(Kang Yoon Suk),김동혁(Kim Dong-Hyuk),김종민(Kim Chong-Min),임병찬(Ihm Pyeong-Chan) 한국건축친환경설비학회 2008 한국건축친환경설비학회 학술발표대회 논문집 Vol.- No.-
As the modem city grows larger and larger, overpopulated and over-storied apartments caused violation of sunlight, view and privacy of their own and these violation became social problems. The purpose of this study is to find the most appropriate sunshine duration calculation method which fits the comfort standard of sunshine duration. This study has performed an analysis for flat-typed positioning apartment with core-protrusion typed roof using 3 different analysis methods which were point-analysis. surface-analysis and the Waldram analysis. The results have shown that the winter solstice day was the most appropriate day for performing sunshine duration analysis. And, the results have shown that the Waldram analysis was not as accurate as other analysis methods. Also, the results between point-analysis and surface-analysis had significant differences. For these reasons, this study has found that the surface-analysis best fits the ideal sunshine duration analysis method for flat-typed positioning apartment with core-protrusion typed roof.
강윤석(Kang Yoon Suk),정미현(Jung Mi-Hyun),박효진(Park Hyo-Jin),김은미(Kim Eun-Mi),임병찬(Ihm Pyeong-Chan) 한국건축친환경설비학회 2008 한국건축친환경설비학회 논문집 Vol.2 No.1
The objective of this research is to study on the analysis of long-term performance characteristics of various solar thermal system for heating protected horticulture system for reducing heating cost, increasing the value of product by environment control, and developing advanced culture technology by deploying solar thermal system. Long term field test for the demonstration was carried out in horticulture complex in Jeju Island. Reliability and economic aspect of the system which was operated complementary with thermal storage and solar hot water generation were analyzed by investigating collector efficiency, operation performance, and control features. Optimum operating condition and its characteristics were closely investigated by changing the control condition based on the temperature difference which is the most important operating parameter.
협업 필터링을 위한 EMD 기반 유사 사용자 선별 기법
강윤석 ( Yoon-suk Kang ),정세현 ( Seihyun Jeong ),이상철 ( Sang-chul Lee ),장민희 ( Min-hee Jang ),김상욱 ( Sang-wook Kim ) 한국정보처리학회 2012 한국정보처리학회 학술대회논문집 Vol.19 No.2
협업 필터링은 유사한 사용자를 선별하여 아이템을 추천하는 대표적인 추천 방법이다. 협업 필터링을 이용한 추천에서 추천 품질은 유사 사용자를 선별하는 기법에 따라 크게 달라질 수 있다. 본 논문에서는 협업 필터링 추천의 품질을 크게 개선 시킬 수 있는 새로운 유사 사용자 선별 기법을 제안한다. 제안하는 기법에서는 Earth Mover’s Distance (EMD)를 이용하여 사용자간의 유사도를 정의한다. EMD를 적용하기 위해서 각 사용자를 히스토그램으로 표현하며, 히스토그램 빈(bin)간의 거리를 정의한다. 이렇게 정의된 유사도를 이용하여 타깃 사용자와 유사한 사용자들을 선별하며, 이를 기반으로 타깃 사용자가 부여한 타깃 아이템에 대한 점수를 예측한다. 다양한 실험을 통하여, 제안된 기법이 기존 기법들과 비교하여 추천의 정확도를 최대 30%까지 향상시키는 것으로 나타났다.