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이광우,곽희상,이수형,이동수,Lee, Kwang Woo,Kwak, Hi-Sang,Lee, Soo Hyung,Lee, Dong Soo 한국해양학회 1979 韓國海洋學會誌 Vol.14 No.1
In order to investigate water quality of coastal waters, samples were collected from the six coastal areas of Korean peninsula during summer of 1977, and analyzed for Cd, Cu, Fe, Pb and Zn by atomic absorption spectrophotometry. The results showed no significant heavy metal pollution in most parts of the studied areas in comparison with results of other countries in literature. However, strong possibility of some specific heavy metal pollution is shown in the specific areas, such as Cu and Pb in the Sea off Cunsan, Pb in Kwangyang Bay and Cd and Pb in Ulsan Bay.
이광우,곽희상,이수형,이동수,Lee, Kwang Woo,Kwak, Hi-Sang,Lee, Soo Hyung,Lee, Dong Soo 한국해양학회 1978 韓國海洋學會誌 Vol.13 No.2
General water quality parameters were measured, as a base-line study, for possible water pollution problems in the coastal waters of some important harbors and near-sea industrial complexes all around coastal zones of Korea from June 1 to October 15, 1977. The areas surveyed were near Mugho-Samcheog, Ulsan, Jinhae-Masan, Yeosu-Gwangyang, Mogpo, Gunsan and Incheon. Among the surveyed coastal areas, the Ulsan and the Jinhae-Masan areas showed high levels of dissolved oxygen, pH, COD and nutrients. Particularly, the surface waters of the Ulsan inner bay represented COD 15.6mg/l and NO$\sub$2/-N 110$\mu\textrm{g}$/l. The surface layer of the Masan bay displayed pH 8.92 and NO$\sub$3/-N 372$\mu\textrm{g}$/l, while 309$\mu\textrm{g}$/l of PO$\sub$4/-P was recorded in the surface of the Haengam bay. In general it is shown that some coastal areas are presenting signs of pollution from man's activities.
이광우(Kwang-Wu Lee),조삼덕(Sam-Deok Cho) 한국토목섬유학회 2008 한국지반신소재학회 학술발표회 Vol.2008 No.4
This paper describes the results of model experiments in the laboratory, which were conducted to assess the behavior characteristics of geosynthetic reinforced soil walls according to different surcharge loads and reinforcement types. The models were built in the box having dimension, l00㎝ tall, 140㎝ long, and 100㎝ wide. Three types of geosynthetics, geonet, geogrid A and geogrid B, are used as the reinforcements. Decomposed granite soil(SM) was used as a backfill material. As the results of the model tests, the maximum horizontal displacements of the model walls occurred due to uniform surcharge pressure were measured at the 0.7*H from the bottom of the wall. The more the reinforcement strength increases, the more the wall displacements decrease.
스트레인게이지에 의해 측정된 토목섬유 인장변형의 신뢰성
이광우(Kwang-Wu Lee),정성규(Sung-Gyu Jung),조삼덕(Sam-Deok Cho),김욱기(Uk-Gie Kim) 한국지반신소재학회 2014 한국토목섬유학회 학술발표회 Vol.2014 No.11
Since the geosynthetics being introduced in our country in 1990, they have been widely used in civil foundation works like reinforced retaining wall, slope reinforcement and soft ground. Recently, geosynthetics have been often used in pile supported embankment to reinforce the soil above pile head, to improve safety, constructability and economic efficiency. However, geosythetics may show different material characteristics depending on raw materials, manufacturing method and manufacturer etc. The material characteristics are very important for design and construction of structures using geosythetics. In order to understand material characteristics of geosythetics, a series of tests on wide-width tensile strength were performed. Based on the test results, tensile strength?tensile deformation relationship was understood. Furthermore, to examine the reliability of tensile deformation rate of geosynthetics, the measurements of tensile deformation rate by strain gage were compared with the actual measurements by laser.