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한경진(Kyungjin Han),이종원(Jongweon Lee) 한국HCI학회 2017 한국HCI학회 학술대회 Vol.2017 No.2
현재까지 보편적으로 사용해오던 QWERTY 레이아웃을 따르는 문자 입력 방식은 몇몇의 대응기기의 사용성 측면에 있어 적절치 못한 경우가 존재한다. 본 논문에서는 카메라 비전 인식을 기반으로 하는 사용자의 제스처 인식을 응용하여 직관적인 비접촉식 한글 입력 시스템을 제안한다. 문자 입력 시점에서 사용자가 직면한 제한된 상황의 사용성과 다른 기기로의 유연한 접목에 대한 가능성을 제시한다.
연속흐름반응조에서 바이오필름형태의 탈염소화 미생물에 의한 TCE분해 모니터링
박선화,한경진,홍의전,안홍일,김남희,김현구,김태승,김영,Park, Sunhwa,Han, Kyungjin,Hong, Uijeon,Ahn, Hongil,Kim, Namhee,Kim, Hyunkoo,Kim, Taeseung,Kim, Young 한국지하수토양환경학회 2012 지하수토양환경 Vol.17 No.5
A 1.28 L-batch reactor and continuous-flow stirred tank reactor (CFSTR) fed with formate and trichloroethene (TCE) were operated for 120 days and 56 days, respectively, to study the effect of formate as electron donor on anaerobic reductive dechlorination (ARD) of TCE to cis-1,2-dichloroethylene (c-DCE), vinyl chloride (VC), and ethylene (ETH). In batch reactor, injected 60 ${\mu}mol$ TCE was completely degraded in the presence of 20% hydrogen gas ($H_2$) in less than 8 days by anaerobic dechlorination mixed-culture (300 mg-soluble protein), Evanite Culture with ability to completely degrade tetrachloroethene (PCE) and -TCE to ETH under anaerobic conditions. Once the formate was used as electron donor instead of hydrogen gas in batch or chemostat system, the TCE-dechlorination rate decreased and acetate production rate increased. It indicates that the concentration of hydrogen produced in both systems is possibly more close to threshold for homoacetogenesis process. Soluble protein concentration of Evanite culture during the batch test increased from 300 mg to 688 mg for 120 days. Through the protein monitoring, we confirmed an increase of microbial population during the reactor operation. In CFSTR test, TCE was fed continuously at 9.9 ppm (75.38 ${\mu}mol/L$) and the influent formate feed concentration increased stepwise from 1.3 mmol/L to 14.3 mmol/L. Injected TCE was accumulated at 18 days of HRT, but TCE was completely degraded at 36 days of HRT without accumulation of the injected-TCE during the left of experiment period, getting $H_2$ from fermentative hydrogen production of injected formate. Although c-DCE was also accumulated for 23 days after beginning of CFSTR operation, it reached steady-state in the presence of excessive formate. We also evaluated microbial dynamic of the culture at different chemical state in the reactor by DGGE (denaturing gradient gel electrophoresis).
지하수 관개 시비의 지하수 내 질산성질소 저감 효과 평가
염여훈,김영,김문수,박선화,한경진,Yuhoon Yeum,Young Kim,Moon-su Kim,Sunhwa Park,Kyungjin Han 한국지하수토양환경학회 2024 지하수토양환경 Vol.29 No.1
In this study, the pump and fertilize (PAF) was applied to reduce nitrogen infiltration into groundwater at three corn cultivation sites over a three-year period, and its effectiveness was evaluated. PAF involves pumping nitrate-contaminated groundwater and using it for irrigation, thereby replacing the need for chemical fertilizers. This method not only substitutes chemical fertilization, but also reduces nitrogen infiltration into groundwater through root zone consumption. To confirm PAF's effectiveness, an equal amount of nitrogen was applied in each cultivation plot, either through chemical fertilizer or irrigation with nitrate-contaminated groundwater. Regular monitoring of infiltrating pore water and groundwater was conducted in each cultivation plot. The linear regression slope for nitrate concentration in the pore water after repeated application of PAF ranged from -3.527 to -8.3485 mg-N/L/yr, confirming that PAF can reduce nitrate concentration in the pore water. With an increasing proportion of PAF, the infiltrating nitrate mass in pore water was reduced by 42% compared to plots fertilized with chemical fertilizer. Additionally, the linear regression slope of nitrate concentration in groundwater was calculated as -2.2999 and -9.2456 mg-N/L/yr. Therefore, continuous application of PAF in rural areas is expected to significantly contribute to reducing nitrate concentration in groundwater.