• 생명과학회지
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• 제22권8호
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• pp.1041-1045
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• 2012

낙동강 유지용수가 공급되고 있는 온천천을 대상으로 2009년 10월부터 2010년 10월까지 수질 및 생물학적 인자변화를 조사하였다. 조사결과 온천천은 BOD, TN, TP 그리고 중금속 농도가 낙동강 유지용수가 공급되기 이전인 2005년에 비해 뚜렷하게 감소한 것으로 나타났으며, 특히 BOD 평균농도가 2.0 mg/l로 모든 지점이 2급수를 유지하였다. 또한 온천천 수중에 존재하는 플랑크톤과 저서성 대형 무척추동물의 종 및 개체수도 증가한 것으로 조사되었다. 결론적으로 낙동강 유지용수가 공급된 이후에 온천천은 수질 및 생물변화와 같은 물 환경인자가 상당히 개선되었음을 알 수 있었다.

• 한국수자원학회논문집
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• 제33권1호
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• pp.73-85
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• 2000

농촌 소하천의 수리학적 및 수질특성을 반영한 모형을 개발하였다. 모형구조 설계시 제어체적 기법을 활용하여 하천 형상, 수질 및 유량의 변화가 심한 농촌 유역의 소하천에 대한 수질의 모의하였다. 개발한 모형에 난수발생기법을 도입하여 최적 반응계수와 모형구조를 추정하였다. 또한 모형 보정기준의 일반화를 위해 동의지표와 효율계수를 도입하여 매개변수추정의 신뢰성 향상을 도모했다. 모형의 적용성을 검증하기 위해 경남 김해시 한림면 용덕천에서 수질을 채취하여 분석하였다. 관측된 자료와 개발된 모형의 비교연구를 통해 대상유역의 소하천에서 일어나는 수질 반응계수들과 그 변동성을 추정하였다.

• 환경영향평가
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• 제27권3호
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• pp.251-266
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• 2018

본 연구는 홍수조절댐의 운영패턴 변화에 따른 수질환경에 미치는 영향을 분석한 것이다. 홍수조절댐은 홍수시 하천유량을 일시적으로 담수하여 홍수를 지체시키는 한편, 평상시에는 자연하천 흐름상태를 유지하는 특성을 가지고 있다. 댐 건설 후 담수시 수질변화는 유역모델(HSPF)과 댐 내 수리 수질변화모델(EFDC)을 연계하여 예측하였다. 강우시 유역에서 유출되는 비점오염원의 유출특성을 반영하기 위하여 HSPF 유역모델을 이용하여 분석하였으며, HSPF의 분석된 자료를 EFDC 모델의 입력 자료로 적용하였다. 수질모의 결과 댐 건설 후 수몰로 인한 오염원 감소와 강우시 일시적 저류로 인하여 수질이 향상되는 것으로 예측되었다. 또한 홍수조절댐의 특성상 담수되는 기간이 짧으므로(2~3일) 부영양화 등 수질 악영향은 거의 없는 것으로 분석되었다. 계획 중인 댐의 환경영향평가 단계에서는 모델의 충분한 보정을 할 수 없기 때문에 정확한 모의에 일부 한계가 있을 수 있다. 그러나 향후 실측자료 확보를 통하여 모델의 신뢰도를 향상시킨다면, 이를 활용하여 신규 홍수조절댐의 환경영향평가 시 다양한 운영조건에 따른 수환경의 영향을 검토할 수 있을 것으로 판단된다.

• Agricultural and Biosystems Engineering
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• 제7권1호
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• pp.42-47
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• 2006

The objective of this study was to investigate the effects of air-phase germination with water-spraying and anion stimuli on germination ratio, sprout growth and ${\gamma}$-aminobutyric acid (GABA) of brown rice. Air-phase germination method with intermittent spraying water improved germination ratio and sprout growth by about 100% compared with the conventional water-soaking method. Anion radiation was applied during the germination process and improved the germination ratio, sprout growth and color quality of the germinated brown rice. Germination ratio and sprout growth were improved up to 9% with anion radiation, and its brightness was higher than brown rice germinated with no anion radiation. The air-phase germination with water-spraying improved the GABA content of germinated brown rice by about 8-9 times compared with that of brown rice.

• 한국환경과학회지
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• 제25권3호
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• pp.361-371
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• 2016

Ministry of Environment has been operating water quality monitoring network in order to obtain the basic data for the water environment policies and comprehensively understand the water quality status of public water bodies such as rivers and lakes. The observed water quality data is very important to analyze by applying statistical methods because there are seasonal fluctuations. Typically, monthly water quality data has to analyze that the transition comprise a periodicity since the change has the periodicity according to the change of seasons. In this study, trends, SOM and RDA analysis were performed at the Mulgeum station using water quality data for temperature, BOD, COD, pH, SS, T-N, T-P, Chl-a and Colon-bacterium observed from 1989 to 2013 in the Nakdong River. As a result of trends, SOM and RDA, the Mulgeum station was found that the water quality is improved, but caution is required in order to ensure safe water supply because concentrations in water quality were higher in the early spring(1~3 month) the most.

• 한국물환경학회지
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• 제37권5호
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• pp.335-343
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• 2021

Water quality prediction is essential for the proper management of water supply systems. Increased suspended sediment concentration (SSC) has various effects on water supply systems such as increased treatment cost and consequently, there have been various efforts to develop a model for predicting SSC. However, SSC is affected by both the natural and anthropogenic environment, making it challenging to predict SSC. Recently, advanced machine learning models have increasingly been used for water quality prediction. This study developed an ensemble machine learning model to predict SSC using the XGBoost (XGB) algorithm. The observed discharge (Q) and SSC in two fields monitoring stations were used to develop the model. The input variables were clustered in two groups with low and high ranges of Q using the k-means clustering algorithm. Then each group of data was separately used to optimize XGB (Model 1). The model performance was compared with that of the XGB model using the entire data (Model 2). The models were evaluated by mean squared error-ob servation standard deviation ratio (RSR) and root mean squared error. The RSR were 0.51 and 0.57 in the two monitoring stations for Model 2, respectively, while the model performance improved to RSR 0.46 and 0.55, respectively, for Model 1.

• 동의생리병리학회지
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• 제32권3호
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• pp.178-183
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• 2018

Pruritus is the most prominent symptom of atopic dermatitis and other skin diseases. It is not easily improved and is a major factor that threatens the quality of life of patients and their families. The purpose of this study was to evaluate the effect of HyungGae-Water, which was bath preparation made from Korean medicine herbs, for children and adolescents suffering pruritus. The participants were 50 boys and girls aged from 2 to 15 years old. The HyungGae-Water was used once a day for 6 weeks, and we were followed up three times every two weeks. Of 50 participants enrolled, 47 completed the study. The outcome variables were dermatology quality of life scales in children, pruritus VAS, and investigator global assessment (IGA). The results of the study show that the dermatology quality of life is significantly improved and the VAS of pruritus has meaningful changes. In the IGA, moderate or severe improvement was observed in 48.9% and slight improvement in 17%. There were seven suspected or less relevant adverse events using HyungGae-Water. The present results suggest that the HyungGae-Water has alleviating effect for the pruritus in children and adolescents.

• 한국환경기술학회지
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• 제19권6호
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• pp.514-527
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• 2018

본 연구는 전라북도 섬진강수계의 수질을 예측 분석하여 수질을 개선하는 시나리오를 구성하여 결과를 산출하였다. 결과적으로 공공하수처리시설의 배출수 관리강화 및 오염물질 관리 개선과 국내 축산계 감소에 따라 수질이 최대 BOD 15.32 %, T-N 7.17 %, T-P 62.86 %로 개선된 것으로 분석되었다. 효율적인 감축 계획수립, 오염부하량 저감계획, 하수 처리 효율 증대 계획, 공공하수처리시설 확대로 인한 오염물질 감소 및 총 오염 부하 동물 배설물 에너지 회수 등 다양한 삭감계획을 보완한 것으로 분석되었다. 자연증가 및 경제발전을 고려한 수질 개선 계획에 대한 연구개발은 수질 개선에 효율적이다.

• 품질경영학회지
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• 제47권3호
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• pp.467-478
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• 2019

Purpose: The purpose of this paper is to improve quality for water infiltration to FCISA during military aircraft operation. Methods: A series of troubleshooting studies were conducted to identify the root cause of the water infiltration and reproduce the defects through various simulation tests. And design improvement measures were derived, and countermeasures were taken to prevent recurrence of moisture inflow defects. Conclusion: FCISA operates a very important role in the operation of military aircraft, and defects due to water infiltration are very fatal to flight safety. In this study, the root cause was identified and the design improvement to prevent recurrence was carried out through the failure investigation performed in this study, and the FCISA was improved so that the flight safety was not affected. The results of this study will be valuable back data that can be reflected in the design process through Lessons-Learned in the design phase of the aircraft that will be developed in the future.

• 수산해양교육연구
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• 제27권1호
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• pp.253-261
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• 2015

The chemical water quality and fish assemblage of Dong Stream to assessment of environmental improvement after discharge seawater were investigated from July to December 2013. BOD and DO were significantly different between before and after discharge seawater, while pH and SS did not significant. A total of 11 fish species, 218 individuals and 10,525.1g were collected. Dominant fish species were Mugil cephalus, Konosirus punctatus, Acanthogobius flavimanus and Leiognathus nuchalis which account for 77.5% of total individuals collected, and they were estuarian species. Peak number of species and individuals, and biomass occurred in September, whereas diversity index were highest in November. The water ecosystem of Dong Stream have been changed estuarian environment. As a result of stream assessment on water quality and ecosystem, water quality have been improved as 'III' grade. These results suggested that stream restoration policies such as drain pipes maintenance, management of pollution sources and riverbed dredging to improve environment and recover habitate of Dong Stream were need for set up and establishment of regular monitoring system.