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류재근,이문호,박혜경,천세억,박승익 한국물환경학회 1992 한국물환경학회지 Vol.8 No.3
The distribution, the dominant species and the seasonal succession patterns of phytoplankton communities in lake Soyang, lake Daecheong, lake Chungju were investigated. Following facts have been clarified through the investigation. ○ Seasonal succession patterns of phytoplankton in lake Soyang and lake Daecheong showed strong seasonality. In lake Soyang, diatoms (mainly Asterionella spp.) were abundant in winter and early spring, this diatoms were replaced by dinoflagellates(Peridinium spp.) in late spring and blue-green algae(Anabaena spp.) succeeded the dinoflagellates in summer, the winter diatoms recurred in autumn. ○ In lake Daecheong, diatoms(mainly Melosira spp.) were dominant throughout the year except summer and early autumn. In summer and early autumn, blue-green algae especially Microcystis spp. dominated and formed the algal bloom. ○ In lake Chungju, diatoms were dominant throughout the year and the blue-green algal bloom was not occurred in summer.
Therapeutic Angiogenesis: The Pros and Cons and the Future
류재근 대한심장학회 2008 Korean Circulation Journal Vol.38 No.2
Despite the improvements in medical, surgical and endovascular therapies, vascular disease is still a significant, critical -periences of sucesful therapeutic aplication in animal models have raised expectations for therapeutic angiogenesis as a promising treatment option. However, the large, double-blinded, controled clinical trials using therapeutic agent in the form of protein, naked DNA or viral gene therapy have failed to show clinical benefit. Nevertheles, by this time, cel based therapeutic angiogenesis has raised a promising option for the treatment of ischemic diseases. This article sumarizes the essential preclinical research and major clinical trials on therapeutic angiogenesis, and it deals are also described with focusing on cel based therapy.
류재근,최용진,서윤수,임연택,이철우,민명자 한국물환경학회 1994 한국물환경학회지 Vol.10 No.2
Two bacterial strains essential for polyvinyl alcohol(PVA) degradation were isolated from an efficient PVA utilizing mixed culture which had been selected by screening experiments with approximately 240 samples from soils and other environmental sources. The two strains were almost unable to grow on the PVA minimal medium in each respective pure culture but the mixed culture of the two strains was found to grow symbiotically and to utilize PVA efficiently as a carbon and energy source. The two symbionts, designated KMG1 and KMG5, were identified as Pasteurella haemolytica and Psudomonas sp., respectively. The Psudomonas sp. KMG5 was confirmed to be an actual PVA degrader and the other symbiont KMGI was presumed to supply the degrader with some kind(s) of growth stimulant. In the mixed culture, the bacterial symbionts utilized almost completely 0.5% PVA at 37℃ in 7 days.
Security Cost Analysis with Linear Ramp Model using Contingency Constrained Optimal Power Flow
류재근,박종근,김문겸 대한전기학회 2009 Journal of Electrical Engineering & Technology Vol.4 No.3
This paper proposes a novel technique for calculating the security costs that properly includes ramping constraints in the operation of a deregulated power system. The ramping process is modeled by a piecewise linear function with certain assumptions. During this process, a ramping cost is incurred if the permissible limits are exceeded. The optimal production costs of the power producers are calculated with the ramping cost included, considering a time horizon with N-1 contingency cases using contingency constrained optimal power flow (CCOPF), which is solved by the primal-dual inte-rior point method (PDIPM). A contingency analysis is also performed taking into account the severity index of transmission line outages and its sensitivity analysis. The results from an illustrative case study based on the IEEE 30-bus system are analyzed. One attractive feature of the proposed approach is that an optimal solution is more realistic than the conventional approach because it satisfies physical constraints, such as the ramping constraint.
류재근 한국물환경학회 2004 한국물환경학회지 Vol.20 No.1
Water quality is monitored at 1,837 points which are streams and sources for water supply in Korea. The monitoring carry out the measurement of 16 parameters of pH, BOD, SS, DO and so on with once a month, and of other parameters such like heavy metal with once a quarter. But most of the monitoring is carried out uncontinuously, so it is very difficult to understand exactly the changes of water quality compared with continuous monitoring. Therefore, real time monitoring system was equipped with basic parameters such as pH, temperature, DO, turbidity and electric conductivity at 25 major sources of water supply after installation of Noryangjin and Dukdo in 1974. But the systems have some problems which cannot be considered the sampling sites to represent for water quality of stream of lake, and can be caused a change of water quality by long distance from analyzer to intake pipe. Therefore, it has carefully to evaluate selection of sample sites for real time monitoring system. Also, problems on the area has been to identify which parameters are best suited to monitoring stream of lake water and the differences, of analyzing results compared with manual analyzing. This paper presents some approaches to handle such problems, namely selection of sampling site and measurable parameters, to connect with bio-monitoring system solving a Limitation of measurable parameters, The bio-monitoring system of an early alarm that is desirable to perceive a toxic material inflow into stream can be applied to continuos water quality monitoring system effectively. Also, this paper presents to build a on line system transmitting immediately from a mobile a n a i m house or container to main monitoring center the results of analyzer by a telemeter.
류재근,Ryu, Jae-Kuen 한국물환경학회 2004 한국물환경학회지 Vol.32 No.2
Water quality is monitored at 1,837 points which are streams and sources for water supply in Karea. The monitoring carry out the measurement of 16 parameters of pH, BOD, SS, DO and so on with once a month, and of other parameters such like heavy metal with once a quarter. But most of the monitoring is carried out uncontinuously, so it is very difficult to understand exactly the changes of water quality compared with continuous monitoring. Therefore, real time monitoring system was equipped with basic parameters such as pH, temperature, DO, turbidity and electric conductivity at 25 major sources of water supply after installation of Noryangjin and Dukdo in 1974. But the systems have some problems which cannot be considered the sampling sites to represent for water quality of stream of lake, and can be caused a change of water quality by long distance from analyzer to intake pipe. Therefore, it has carefully to evaluate selection of sample sites for real time monitoring system. Also, problems on the area has been to identify which parameters are best suited to monitoring stream of lake water and the differences, of analyzing results compared with manual analyzing. This paper presents some approaches to handle such problems, namely selection of sampling site and measurable parameters, to connect with bio-monitoring system solving a Limitation of measurable parameters, The bio-monitoring system of an early alarm that is desirable to perceive a toxic material inflow into stream can be applied to continuos water quality monitoring system effectively. Also, this paper presents to build a on line system transmitting immediately from a mobile analyzer house or container to main monitoring center the results of analyzer by a telemeter.
Salmonella 및 Shigella의 약제내성의 양상에 관한 조사연구
류재근 한국환경보건학회 1974 한국환경보건학회지 Vol.1 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 Shigella were kanamycin, gentamycin and minomycin.