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수리지화학적 추적자(<sup>222</sup>Rn, 주요용존이온)와 미생물 군집 분석을 통한 도심 지역 하천에서의 지하수 유출 특성 평가
오용화,김동훈,이수형,문희선,조수영,Oh, Yong Hwa,Kim, Dong-Hun,Lee, Soo-Hyoung,Moon, Hee Sun,Cho, Soo Young 한국지하수토양환경학회 2020 지하수토양환경 Vol.25 No.2
In this work, <sup>222</sup>Rn activity, major dissolved ions, and microbial community in ground- and surface waters were investigated to characterize groundwater inflow to the stream located in an urban area, Daejeon, Korea. The measured <sup>222</sup>Rn activities in groundwater and stream water ranged from 136 to 231 Bq L<sup>-1</sup> and 0.3 to 48.8 Bq L<sup>-1</sup>, respectively. The spatial distributions of <sup>222</sup>Rn activity in the stream strongly suggested groundwater inflow to the stream. The change of geochemical composition of the stream water indicated the effect of groundwater discharge became more pronounced as the stream flows downstream. Furthermore, microbial community composition of the stream water had good similarity to that of groundwater, which is another evidence of groundwater discharge. Although groundwater inflow could not be estimated quantitatively in this study, the results can provide useful information to understand interactions between groundwater and surface water, and determine hydrological processes governing groundwater recharge and hydrogeological cycles of dissolved substances such as nutrients and trace metals.
吳容和,成在鉉 慶北大學校 齒科大學 1985 慶北齒大論文集 Vol.2 No.1
The objective of this study was to evaluate the effect of heat treatment on mechanical properties in.016" Green Elgiloy wires. Ultimate tensile strength, yield strength and elongation were measured with Instron type tension testing machine. The results were as follows: Ultimate tensile strength and yield strength were progressively increased by heat treatment, but elongation was decreased. Increased degree of strength by heat treatment was more effective by temperature than time. Ultimate tensile strength showed the highest value(231.6Kg/㎟) after heat treatment for 3 and 6 minutes at 550℃, and progressively decreased after heat treatment at 600℃. Yield strength showed the highest value (120.4Kg/㎟) after heat treatment for 6 minutes and 9 minutes at 550℃. Elongation showed the lowest value(7.4%) after heat treatment for 12 minutes at 500℃ and 550℃. The optimal temperature and time of heat treatment were 550℃ and 6±3 minutes.
오용화,성재현 慶北大學校 齒科大學 1989 慶北齒大論文集 Vol.6 No.3
The purpose of this study was to investigate the effect of pulsating electromagnetic fields on mandibular growth in rats and determine the potentiality of future clinical applications. The 124 male rats used in this study were Sprague-Dawley species, and were divided into experimental (62) & control groups(62). The pulsating electromagnetic fields was applied to experimental animals 10 hours per day during day-time After the rats were sacrified at 1, 3, 7, 14, 35 days, the histologic examination and biochemical analysis of cAMP content in condyle were undertaken with 10 sacrified rats of each groups. The changes of body weight, the changes in length of tibia and the linear & angular measurements of mandinble were observed in 35day group. The following results were obtained. 1. The histologic finding showed increased vascularity and congestion in condyles of 7 day experimental group, even though some variations existed. 2. The body weight of experimental group was heavier than that of control group from 2 weeks after beginning of experiment. 3. The length of tibia in experimental group was significantly longer than that in control group. 4. The depth from mental foramen to condylion of experimental group was significantly longer than that of control group. 5. The content of cAMP in rat condyle of experimental group was lesser than that of control group group in 7 day group.
농업지역 지하수의 수리지화학 및 미생물 군집 구조 분석
김동훈,오용화,이봉주,이정윤 한국지하수토양환경학회 2022 지하수토양환경 Vol.27 No.2
This study evaluated the potential threat of agricultural and human activities to groundwater in the Noseong streamwatershed, a typical agricultural area, through hydrogeochemical characteristics and microbial community analyses. Thegroundwater in the study area was Ca-SO4 and Ca-HCO3 types alluvial aquifer mainly used for agricultural and livingpurposes, and contained high levels of NO3- and Cl- ions generated from anthropogenic sources such as fertilizer, livestockwastewater, and domestic sewage. Proteobacteria was most abundant in all samples with an average of 46.1% whileActinobacteria, Bacteroidetes, and Cyanobacteria were dominant on an occasional basis. The prevalence of aerobicbacteria such as the genus Mycobacterium, Flavobacterium, and Sphingomonas suggests that groundwater was wellconnected with the surface layer. The potential pathogen Mycobacterium was detected in most samples, and otherpathogenic bacteria were also widely distributed, indicating the vulnerability to contamination. Therefore, an integratedmanagement system is required to secure the sustainable use of groundwater in agricultural areas with high groundwaterdependence.