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클러스터링 기반 협업 필터링 알고리즘을 사용한 분산 추천 시스템
조현제,이필규 한국인터넷방송통신학회 2014 한국인터넷방송통신학회 논문지 Vol.14 No.1
본 논문에서는 협업 필터링 알고리즘을 클러스터링 기반으로 분산 환경에서 구현하여, 추천을 위한 수행 시 간을 최적화 하는 방법에 대한 제안을 한다. 하둡 기반으로 시스템을 구성하였고, 분산 Min-hash 클러스터링 기반의 협업 필터링 방법을 제안하고, 이를 기반으로 분산 추천 시스템을 구성하였다. 분산 사용자 기반 협업 필터링 기법을 사용하여 무비렌즈 (Movie Lens)의 영화 평점 데이터를 기반으로 각각의 사용자에게 알맞은 영화를 추천해주는 분산 추천 시스템을 구현하고 실험을 통하여 성능의 우수성을 검증하였다. This paper presents an efficient distributed recommendation system using clustering collaborative filtering algorithm in distributed computing environments. The system was built based on Hadoop distributed computing platform, where distributed Min-hash clustering algorithm is combined with user based collaborative filtering algorithm to optimize recommendation performance. Experiments using Movie Lens benchmark data show that the proposed system can reduce the execution time for recommendation compare to sequential system.
2P-717 플라즈마 토치를 이용한 금속 용융시 용융로 외면 온도분포 해석
조현제 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
최근, 원전 해체시 발생되는 다량의 비가연성 폐기물에 대한 처리기술의 하나로서 플라즈마 용융기술이 대두되고 있다. 그러나 플라즈마 용융로 설비는 1600도 이상의 고온을 취급하는 장치로서, 설비 건전성과 운전 안전성을 위해서는 용융로 내부 고온이 외부로 전달되지 않도록 내화물을 최적으로 구성하여 내부 고온을 감소시킬 필요가 있다. 용융로 내부 용융물 수위와 내부 분위기 온도에 따른 용융로 외부 철피 온도의 분포를 열유동 해석을 통하여 분석하였다. 본 연구의 목적은, 플라즈마 용융로 설비를 이용하여 금속, 콘크리트 등 비가연성 폐기물을 처리할 경우, 설비 건전성를 위해 필요한 내화물 종류 및 관련 기술자료와 최적 운전을 위해 필요한 냉각수 유량과 용융 대상물의 처리용량 변수 확보를 위한 것이다.
大邱廣域市 都市林의 生態的 保全 및 管理를 爲한 植生單位區分
조현제 대구산업정보대학 2000 논문집 Vol.14 No.2
To obtain ecological management of urban forests in and around Daegu metropolitan city, Korea, forest vegetation units were classified via the methods of the ZM School of phytosociology, scrutinized ecological characteristics(species diversity, community similarity, ecological niche, constance class of constituent species etc.) and derived ecological management units based on the classified vegetation units. forest vegetation units of the study area consisted of fourteen communities as upper units, sixteen groups as middle units and ten subgroups as lower units and the ecological management units revealed into twenty-nine types. The succession trends of vegetation units indicated that Quercus mongolioa community, Q. acutissima community and Q. variabilis community can be maintain by themselves, however other communities can be expected to be changed into Q. mongolioa forest or Q. serrata forest by the site conditions. According to the ecological niche based on the importance value, Q. serrata as trees, Rhododendron mucronulatum as shrubs and Spodiopogon sibiricus as herbs showed the highest level and especially, below shrub layers, xeric species showed the higher ecological niche than mesic species. Comparing with the constance classes of the constituent species of forest vegetation, the higher species over constance classes Ⅲ formed only three percentages and the lower species below constance classes I formed over ninety-one percentages.
趙顯濟 대구산업정보대학 1999 논문집 Vol.13 No.1
Forest vegetation developed in and around Dong River, Kangwondo, the Mideast Korea, were classified and its ecological characteristics described by methods of the ZM School of phytosociology with special reference to its ecological conservation and management. The forest vegetation of the study area can be divided into mountain type and reparian type, based on geography and site conditions. The mountain type was classified the vegetation type of the valley & depression area and the slope and prominence type. The vegetation type of the valley & depression were further subdivided into thirteen natural communities and one artificial community. The vegetation types of the slope & prominence area were further subdivided into seven natural communities. The Reparian type was classified one natural community and one naturalized plant community. Species diversity (H') of forest vegetation was 1.48 on an average, which showed the highest 3.06 at Phellodendron amurense community and the lowest 0.66 at Pinus densiflora community.
조현제,오승환 대구산업정보대학 2001 논문집 Vol.15 No.-
The present vegetation established on Daemyongcheon wetland, were studied phytosociologically, with special reference to its ecological conservation and management. Vegetation types of this area were classified into two higher units(community level), six lower units and five lowest units, giving twenty management areas. Phragmites communis occupied the highest ecological niche. The species diversity(H'), the evenness(J') and the maximum of species diversity(H'max) were showed 3.03±0.38, 0.90±0.06 and 3.42±0.52, respectively. According to the constancy diagram of the component species, the lower classes(< I) have 84.5% in the plant species occurring to this area and the higher classes(> III) only 3.6%. The ratio of naturalized plants showed 40%, which was much higher than the nearby wetland(Dalseong wetland 19.4% and Daelim wetland 15.3%).