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박미정,지원현,고일하,이상환,Park, Mi Jeong,Ji, WonHyun,Koh, IlHa,Lee, Sang-Hwan 한국지하수토양환경학회 2018 지하수토양환경 Vol.23 No.5
Soil trace elements and their bioaccumulation in agricultural products have attracted widespread concerns, yet the crop uptake characteristics of trace elements in different soil-plants systems have been rarely investigated. Experiments were carried out to investigate the effect of soil properties on trace element concentrations in cabbage and radish. Soil pH and total organic matter were major factors influencing trace elements transfer from soil to vegetables. Inclusion of other soil properties in the stepwise regression analysis improved the regression models for predicting trace element concentrations. Consideration of other soil properties should be taken into account for more precise prediction of trace element concentrations in the two vegetables, which could help quantitatively evaluate the ecologic risk of toxic trace elements accumulation in crops.
Fengshi Guo,Yangmin Ren,Mingcan Cui,Wonhyun Ji,Junjun Ma,Zhengchang Han,Jeehyeong Khim 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.128 No.-
In this study, the waste reuse of water purification plant sludge (WPS) and coal mine drainage sludge(CMDS) was carried out and synthesized into beaded adsorbents BWPS and BCMDS. The WPS is rich inaluminum, and the aluminum-based adsorbent has a good adsorption effect on the fluoride in water. CMDS is rich in iron and calcium, arsenic can be removed from water using this device. The experimentsmainly probed the pollutant-removing effects of two beaded adsorbents on fluoride and arsenic in water. According to the Langmuir isotherm equation, the maximum adsorption capacities (Qmax) of F- on BWPSand BCMDS are 0.90 and 0.65 mg g1, and the Qmax of As (V) are 9.87 and 14.88 mg g1, respectively. Witha range of pH 4 10 in experiments, increasing pH decreased the pseudo-second-order rate (K2) of F- andAs(V) adsorbed on the beaded adsorbents. The mechanism for removing F- by BWPS is physical adsorption,on BCMDS are ion exchange and precipitation, and for As(V) are physisorption and precipitation. Inthe desorption experiments, the results indicated that both adsorbents can be reused. In addition, it iscombined with XGBoost and SHapley Additive exPlanations (SHAP), to predict the adsorption capacity. Data preprocessing and model training improved the prediction accuracy, resulting in a final RMSE of0.429 and an average prediction accuracy of 91%. Through the evaluation index (EI) select the final adsorbent,the results showed that the choice of adsorbent was unchanged in general conditions and expertsurveys, however, in some specific scenarios can be changed.
CAE를 이용한 항공용 장비 장착대의 구조 안전성 해석
이강욱(Kangwook Lee),한종표(Han Jong Pyo),변진구(Byun JinKu),김원현(Wonhyun Kim),최지호(Ji-Ho Choi) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
Some aerospace equipment use the mount tray for convenience of installation or uninstallation to the aerospace vehicle. In the aerospace vehicle, the weight is the most important factor to design the vehicle. Because, it has an influence on fuel, and that go into effect at cost. So, the mount tray is required to have not only strength, stiffness but also light weight. In this study, an analysis method of mount tray using finite element model(FEM) has been presented. Using this FEM, Vibration analysis and Acceleration analysis are conducted to confirm the structural safety. Structural analysis and material study were performed on mount tray. The finite element analysis(FEA) were performed with NASTRAN and the solid models were generated with IDEAS.
철산화 박테리아의 생장 및 활성 억제를 통한 산성광산배수의 발생 저감
박영태(Park, Youngtae),양중석(Yang, Jungseok),권만재(Kwon, Manjae),윤현식(Yun, Hyunshik),지민규(Ji, Minkyu),지은도(Jee, Eundo),이우람(Lee, Wooram),지원현(Ji, Wonhyun),권현호(Kwon, Hyunho),최재영(Choi, Jaeyoung) 한국지반환경공학회 2012 한국지반환경공학회논문집 Vol.13 No.4
폐광산의 산성배수(AMD)는 황철석을 비롯한 다른 금속 황화물의 산화를 통해 발생한 폐광산의 산성배수는 환경오염의 원인 중 하나이다. 본 연구에서는 이러한 폐광산의 산성배수가 생성되는 과정에서 산화미생물의 관여 정도를 알아보고, 이를 억제할 수 있는 방법에 대해여 살펴보았다. 산성배수 발생에 영향을 미치는 산화미생물로 Acidithiobacillus ferrooxidans, Acidithiobacillus thiooxidans을 선정하였으며, 이 산화미생물의 활성 및 생장 속도를 측정하였으며, 이산화염소(ClO₂), NaCl, 그리고 계면활성제(ASOR-770) 를 산발생 억제제로 이용하여 실험을 진행하였다. 실험 결과 10ppm 이산화염소가 가장 효과적인 억제제였으며, 산화미생물의 활성도와 생장도를 20% 까지 감소시켜주었다. Acid mine drainage (AMD) is one of the most severe environmental problem that results from the oxidation of pyrite (FeS₂) and various other metal sulfides. In this study, the influence of microorganism was tested on the process where AMD was released and the method to inhibit AMD generated by microorganisms at abandoned mine area. The activity and growth rate of Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans, common microorganisms affecting AMD occurrence, were measured. Chlorine dioxide (ClO₂), NaCl, or surfactant (ASOR-770) was used as an inhibitor for working on activity and growth of microorganism. Among the three inhibitors, 10ppm of chlorine dioxide was the most effective inhibitor for AMD control due to the reduced the activity and growth of microorganisms by 20%.