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연구논문(硏究論文) : 종분포모형을 이용한 수원청개구리의 번식기 서식지 분석
송원경 ( Wonkyong Song ) 한국환경복원기술학회 2015 한국환경복원기술학회지 Vol.18 No.1
Hyla suweonensis is an endemic species and is designated as the only endangered species I among amphibians in 2012 by the Ministry of Environment, however studies about its habitat are lacking. This study was carried out to analyze habitat of H. suweonensis based on the spatial information using Maxent (Maximum entropy model as a species distribution model. We detected 45 present points until 2013 and 10 environmental variables by literature review for the model. The results showed that 429km2 (0.95%) of the study area, which was about 7.75% of the total agricultural area, was high possible habitats of H. suweonensis. The habitat of H. suweonensis was analyzed by over 1km2 rice paddy fields that were lower elevations, flat slopes, and not fragmented. The distance from forests and rivers was identified as a factor that affects its habitat possibilities. In order to conserve H. suweonensis, a large area of rice paddy fields should be preserved, and especially the area around forests and rivers would be required more intensive management. In addition, to compensate for degraded habitats of H. suweonensis in urban areas like as Suwon city, considering integrated watershed management strategy could be effective in the perspective of ecological habitat network of H. suweonensis.
도시공원 구조 및 식생 조건에 따른 조류 종다양성 분석 -천안시 26개 도시공원을 대상으로-
송원경 ( Wonkyong Song ) 한국환경복원기술학회 2015 한국환경복원기술학회지 Vol.18 No.3
The urban park has important functions as a habitat for wildlife as well as open space of rest and community for people. This study was carried out to find what factors of structure and vegetation of urban parks could affect forest bird species diversity in Cheonan city. The study surveyed bird and vegetation species in 26 urban parks, Cheonan city. A correlation analysis and multiple linear regressions were performed to test whether habitat structure and vegetation were the major correlate with species diversity. The results showed the Dujeong park was the most high bird species diversity (H’= 2.13), and the Dujeong-8 park (H’ = 2.02) and the Cheongsa park (H’ = 1.73) were considerably higher than the other urban parks. The variables that were strongly correlated with bird species diversity were park area, number of subtree species, canopy of shrub, number of shrub species, shape index, canopy of subtree, canopy of tree, and impervious surface ratio. The regression of bird species diversity against the environmental variables showed that 3 variables of park area, canopy of subtree, and canopy of tree were included in the best model. Model variable selection was broadly similar for the 5 optimal models. It means park area and multi-layer vegetation were the most consistent and significant predictor of bird species diversity, because urban parks were isolated by built-up areas. Especially the subtree coverage that provides shelter and food for forest birds was an important variable. Therefore, to make parks circular-shaped and abundant multi-layer vegetation, which could be a buffer to external disturbances and improve the quality of habitats, may be used to enhance species diversity in creation and management of urban parks.
하수에서 응집제 주입률 자동제어 시스템(CAST)을 이용한 MF 분리막의 막 오염에 관한 응집 전처리 효과에 관한 연구
김원경 ( Wonkyong Kim ),성윤경 ( Yunkyong Sung ),유흥성 ( Hungsung Yoo ),박용진 ( Yongjin Park ) 한국수처리학회 2015 한국수처리학회지 Vol.23 No.4
A combined system of coagulation and membrane processes was investigated in this study for coagulation pretreatment on the fouling of microfiltration membrane in treating municipal wastewater. Coagulant dosing is traditionally based on jar-tests or operator experience, resulting in either overdosing or insufficient dosing. For reliable purity and accuracy, on-line coagulant control instrumentation is necessary. In this study, we assess the feasibility of a new coagulant dose control instrument, the online charge-based automatic titration system, charge analyzing system with titrator (CAST), to control membrane fouling in microfiltration (MF) process. This paper presents a 100 m3/d pilot for effect of coagulation pretreatment and organic matters (UV254, PO4-P) removal using a coagulation/MF process. To confirm the coagulation effect, the CAST unit was also compared with a control method where coagulants were applied at a constant rate using In-Line Mixer device. For the extension of filtration time required to reach TMP in MF process, the application of CAST unit by applying a CAST Factor can be more useful and effective for reducing CIP cycle time, and energy, water, and chemical consumption than a control unit due to the rapid and accuracy calculation of coagulant dosage.
송원경(Wonkyong Song),허승(Sung Heo),김태혁(Tae-Heok Kim) 한국암반공학회 2008 터널과지하공간 Vol.18 No.5
광미적치장 수문 분석은 강우에 의한 유출량 합과 배수처리량을 단순 비교하는 댐과 달리 지하 배수시설 뿐만 아니라 지상배수시설과 비상배수시설 등 여러 종류의 배수처리 시설이 복합적으로 운영되기 때문에 유출량과 배수량을 시공간적으로 비교하여야 한다. 본 연구에서는 이와 같이 다단계 배수시설로 구성된 구 상동광산의 신광미적치장의 배수처리 능력을 GIS 기법을 이용하여 분석하였다. 분석 결과, 배수시설이 정상 작동할 경우 100년 빈도 1시간 확률강우량인 80.31 ㎜/hr의 강우강도로 1시간 동안 비가 내리더라도 범람의 위험성은 없는 것으로 예측되었다. 그러나 모든 배수시설이 작동하지 않는다면 총 강우량이 251.1 ㎜에 도달할 때 광미댐은 범람의 위험성이 있는 것으로 예측되었다. Hydraulic analysis in a dam that has a single outlet of water can be made through a simple comparison between the total precipitation and the volume of discharged water. In case of tailing dams this estimation could yield an error because several drainage facilities are worked independently as well as simultaneously. In this research, a capability of the drainage system in the tailing dam of the old Sangdong Mine was analysed by the means of GIS technic. As a result of this study, it was expected that in the normal working condition of the whole drainage system, the flooding of water over the dam should not occur in spite of the consecutive precipitation during one hour with an intensity of 80.31 ㎜/hr, a probable precipitation within 100 years. It was, however, revealed that, if the drainage system did not work completely, the water could flood over the dam when the total precipitation reached 251.1 ㎜.
Mechanisms for Hfq-Independent Activation of rpoS by DsrA, a Small RNA, in Escherichia coli
Kim, Wonkyong,Choi, Jee Soo,Kim, Daun,Shin, Doohang,Suk, Shinae,Lee, Younghoon Korean Society for Molecular and Cellular Biology 2019 Molecules and cells Vol.42 No.5
Many small RNAs (sRNAs) regulate gene expression by base pairing to their target messenger RNAs (mRNAs) with the help of Hfq in Escherichia coli. The sRNA DsrA activates translation of the rpoS mRNA in an Hfq-dependent manner, but this activation ability was found to partially bypass Hfq when DsrA is overproduced. The precise mechanism by which DsrA bypasses Hfq is unknown. In this study, we constructed strains lacking all three rpoS-activating sRNAs (i.e., ArcZ, DsrA, and RprA) in $hfq^+$ and $Hfq^-$ backgrounds, and then artificially regulated the cellular DsrA concentration in these strains by controlling its ectopic expression. We then examined how the expression level of rpoS was altered by a change in the concentration of DsrA. We found that the translation and stability of the rpoS mRNA are both enhanced by physiological concentrations of DsrA regardless of Hfq, but that depletion of Hfq causes a rapid degradation of DsrA and thereby decreases rpoS mRNA stability. These results suggest that the observed Hfq dependency of DsrA-mediated rpoS activation mainly results from the destabilization of DsrA in the absence of Hfq, and that DsrA itself contributes to the translational activation and stability of the rpoS mRNA in an Hfq-independent manner.
도시공원 경관 연결성 및 구조에 따른 조류 종다양성 분석
송원경 ( Song Wonkyong ) 한국환경복원기술학회(구 한국환경복원녹화기술학회) 2017 한국환경복원기술학회지 Vol.20 No.1
The function of urban parks as wildlife habitats is becoming increasingly important. The urban park serves as a key area for preserving urban biodiversity. The purpose of this study is to estimate the bird species diversity in 30 parks in Cheonan city and quantitatively analyze the influence of vegetation, park structure and landscape connectivity index. As the results, a total of 27 birds species and 1,509 individuals were found at the sites and the largest number of birds were found in the Cheongsa park with 17 species. The optimal regression model was selected as the explanatory variables for the logged park area (LPA), the tree cover ratio (Co_T) and the patch betweenness centrality (PB). LPA and Co_T mean the internal characteristics of the park, and PB was the external environmental variable meaning landscape connectivity. LPA was the most important factor (73.3%) as bird habitat, and the PB could be interpreted as a factor that should be considered as important (26.7%). It will be possible to consider these environmental variables in the park and green area construction and management.