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강신복 ( Kang Shinbok ),이성민 ( Lee Sungmin ),박현구 ( Park Hyeongu ),이수곤 ( Lee Soogon ) 한국구조물진단유지관리공학회 2001 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.5 No.1
The aim of this paper is to know the relationships between the surface roughness of masonry stones and the dynamic characteristics of stone structures. For this purpose, three types of granite bricks which have different roughness of surface(rough touch with machine, burner finish, saw cut) were made and fundamental frequencies were measured as increasing of the number of brick layers. The order of measured natural frequencies were not in accordance with the order of roughness of surface. The spring constants obtained by using the natural frequencies decreased as increasing of number of layers, and the vibration modes of stone masonry structures were influenced by rocking and flexure as well as swaying and shear.
김광재 ( Kim Gwangjae ),박현구 ( Park Hyungu ),이성민 ( Lee Sungmin ),이수곤 ( Lee Soogon ) 한국구조물진단유지관리공학회 2000 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.4 No.2
Most of the previous studies on the Chonsungdae have been concerned primarily with its function - whether it was built as an astronomical observatory or as an symbolic structure. This study has focused on the dynamic characteristics of Chomsungdae, primarily on its natural frequency, contact stiffness of stones and stability of structural system. In 1/10 scale model test, natural frequency changes with various types of filling material were investigated. The information of dynamic characteristic of Chomsungdae will give useful data for preservation of it.
우리나라 Pseudanabaena 속 남조류 종다양성 및 남조류 기원 이취미 물질(2-MIB)의 발생
김건희 ( Kim Keonhee ),박채홍 ( Park Chaehongk ),심연보 ( Shim Yeonbo ),김난영 ( Kim Nan-young ),이수곤 ( Lee Soogone ),장재영 ( Jang Jaeyoung ),이가람 ( Lee Karam ),황순진 ( Hwang Soon-jin ) 한국물환경학회 2021 한국물환경학회지 Vol.37 No.5
Off-flavor materials (geosmin and 2-methylisoborneol (2-MIB)) produced by microorganisms, such as, cyanobacteria and actinomycetes, cause freshwater use problems worldwide. Due to unpleasant taste and odor, these microorganisms have raised issues especially in drinking water resources. Recently, there has been increasing concern about 2-MIB and causal cyanobacteria, namely, Pseudanabaena, in Korea. However, material production and ecological dynamics remain largely unexplored. This study reviewed the distribution of Pseudanabaena, its species diversity, and the research trend of molecular ecology related to 2-MIB production in Korea. Based on published literature, we found that seven species of Pseudanabaena which include P. mucicola, P. limnetica, P. redekei, P. catenata, P. galeata, P. yagii, and P. cinerea appeared to occur in a variety of Korean water systems. All of these Pseudanabaena species were found in the North-Han River system (Lakes Soyang, Chuncheon, Uiam, and Paldang). Some of these species were also detected in other watersheds, but the precise species diversity was not identified. Species belonging to the Pseudanabaena genus are hard to classify through general microscopic alpha taxonomy, due to their very small cell size and similar morphological characters. Moreover, the potential of 2-MIB production cannot be detected by microscopic observation. Combining molecular ecological techniques, such as, environmental genomic materials (eDNA, eRNA) analyses to conventional methods could be useful to better understand the off-flavor material production and dynamics, thereby providing more efficient management strategies of freshwater systems.