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류재근,Ryu Jae Keun 대한환경위생공학회 1987 대한환경위생공학회지 Vol.2 No.2
Due to the increase of population and development of industry, the demand of available water resources increased . Many reservoirs have been constructed in large scales to meet this urgent need , resulting in the increased amount of water resources. After the constructions, however, serious pollution-especially eutrophication-in some reservoirs become a socialaffair. Therefore, water quality control in these resources should be considered more intensively than any other environmental preservation policies. It also seems to be imminent to prepare the precautionary steps. Most water pollution in Korea-73 percent - can be traced to domestic sewage. It may rome as a surprise to Some, Industry is responsible for just 27 percent of ]Korea's water pollution. What he calls 'non-point' Sources, which may include agricultural Chemicals, Create only negligible amount of water pollution. Up to $15\%$ of domestic sewage is treated in Korea, which is quite low when compared with the waste processing in developed countries. So it is the most urgent matter to control the pollution sources. One of the precautionary plans, more urban domestic sewage treatment plants must be installed and operated efficiently. It is known that nutrients such as nitrogen and phosphorous are the major factors the process of eutrophication, which can be removed majorly by the tertiary or advanced treatment process.
포스트코로나시대, 물산업관점에서의 하수마이닝 기술의 전망
류재근 ( Ryu Jae-keun ) 한국물환경학회 2020 한국물환경학회·대한상하수도학회 공동 춘계학술발표회 Vol.2020 No.-
Currently epidemic Corvid-19 is expected to slow down or disappear over time. Hereafter, if the preventive measures such as social distancing are loosened or phased out, there is a possibility for the Corvid-19 epidemic to be reappeared. These days more than 10 countries, including Netherlands, have developed technologies based on wastewater analysis to detect Corvid-19, and suggested the possibility of early detection of Corvid-19. As of now, however, further development of the technologies is needed to enhance their sensitivity and specificity, and a system is required to be established to be able to precisely estimate the number of the infected by Corvid-19. Moreover, if currently highlighted Artificial Intelligence technology is to be applied to the system, more efficiently and in more short time, it is expected that the increase or decrease of the number of the infected would be revealed, as well as the presence and absence of the infected. In addition, it is urgently needed to establish a system to keep the important samples to be able to estimate the past outbreaks and pollutions when infectious diseases and other accidental events will be occurring. In that regard, it is desirable to establish a national environmental samples bank to keep the important samples of wastewater, river water, and others to prepare for the future.
한국(韓國)에서 분리(分離)한 Salmonella 및 Shigella의 약제내성(藥劑耐性)에 관(關)한 연구(硏究)
류재근 ( Jae Keun Ryu ) 대한임상검사과학회 1973 대한임상검사과학회지(KJCLS) Vol.5 No.1
The Agar plate titrations of Antibiotic Sensitivities of Salmonella and Shigella isolated from human during 1967 to 1972 were studies. 1. The most effective antibiotics against Salmonella and Shigella were Chloramphenicol, Tetracycline, Kanamycin, Minomycin, and Gentamycin. 2. All strain of Salmonella typhi were resistant to Cloxacilline. 3. The most effective antibiotics against ShigeIIa were Gentamycin and Minomycin.
박선구,류재근 ( Sun Ku Park,Jae Keun Ryu ) 한국물환경학회 1998 한국물환경학회지 Vol.14 No.2
This study was performed to change Mn method of Korea at present into Cr method comparing testing methods in each country for the measurement of COD. Office testing method for water quality contamination was newly proposed that advantages were considered by comparing, assessing and evaluating the JIS of Japan, standard method(closed reflux, open reflux) and EPA of U.S.A., Experiments for the KHP standards, lake water and effluent water drained from wastes treatment plant were carried out several times successively to certain reproducibility of each testing method, in result, standard deviation of experiment by proposed method has shown good results more than other ones. The COD of lake and stream water for Han river, Nakdong river, Kum river, and Yungsan river was measured by Mn and Cr method, the concentration of COD was different in each sampling site. In case of lake water with class I∼II, the ratio of COD resulted from two methods was 2∼3times and concentration of COD by Cr method was about 10ppm. The concentration of COD by Cr method was 35ppm at the site contaminated with polluants considerably. Raw wastewater and effluent water of 15 discharge sources for 6 industries were measured for the COD by Mn and Cr method to compare the difference of two methods. The ratio of COD between Mn and Cr method for raw wastewater and effluent water was 2∼4times except industrial chemistry, leather and fur industry. The experiment was also performed to compare oxidation percent for six organic compounds including benzene, Cr method(above 95%) was higher than Mn method(60∼65%).
팔당호의 (八堂湖) 방사환경 (放射環境) 및 열수지(熱收支)
공동수,윤일병,류재근 ( Dong soo Kong,Il Byong Yoon,Jae Keun Ryu ) 한국하천호수학회 1996 생태와 환경 Vol.29 No.1
Lake Paldang is a man-made shallow lake with tributaries showing dendritic pattern. In case that solar energy at the outer airspace of Lake Paldang is considered as 100%, incident solar radiation at the lake surface occupies 41.8% as 107,602 gcal ·cm^-2 ·yr^-1; absorbed, reflected, and scattered solar energy in the air 30.7%; absorbed and reflected solar energy by cloud 27.5%, net-back radiation 18.4%; not solar energy 19.2%; evaporative heat loss 17.9%; latent heat loss after evaporation 1.4%; sensible heat intake and net-advected outflowed heat energy are 1.2% respectively; heat storage is -0.07%. Euphotic depth is about 2.5 times than transperance(Secchi Disc depth), and annual mean euphotic depth is 4.4 m. The coastal slope of lake substratum is so weak that the coastal euphotic area occupies 41.1% of total surface area and the littoral zone occupies 16% of the lake surface area. Ecological solar energy intake efficiency by annual gross primary production of phytoplankton with aquatic macrophytes is so high as 0.40%.
공동수,윤일병,류재근 ( Dong soo Kong,Il Byong Yoon,Jae Keun Ryu ) 한국하천호수학회 1996 생태와 환경 Vol.29 No.1
Lake Paldang is an impounded stream which has dendritic tributaries in upstream area. The effluent ratio to the total rainfall in the drainage area is high upto 56.9% and Horton`s formation factor of the drainage basin is 0.162. Due to the shallowness(mean depth: 6.4 m), high fluctuation of water level, and high areal ratio of drainage basin to lake surface(the ratio: 628), lake ecosystem has tendency to be fragile, especially during the flooding period. Total precipitation in the drainage basin is 29,428×10^6 m^3·yr^-1 and the lake inflow is 16,686×10^6 m^3 ·yr^-1. Surface inflow occupies 99.7% and rainfall inflow in the lake surface is 0.3% of total inflow. Water volume used to generate eclectic power occupies 56.9% of total outflow; that used as drinking and industrial water supplies occupies 4.4%, and overflow during flooding period occupies 35.9%. Daily water level varies from `0`to 63 cm. The can be attributable to the high fluctuation of upstream discharge flow at Chongpyong dam. This fluctuation often causes flow direction at Kyongan stream to be reversed and ecosystem in upper layer of the lake to be disturbed. Hydraulic flushing rates and hydraulic retention times vary from 41 yr^-1 to 140 yr^-1 and 2.6days ·yr^-1 to 9.0 days ·yr^-1 respectively.