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정체수역 수질개선 및 합성곱 신경망 모델을 이용한 모니터링에 관한 연구
이재엽 ( Jaiyeop Lee ),김일호 ( Ilho Kim ) 한국수처리학회(구 한국수처리기술연구회) 2020 한국수처리학회지 Vol.28 No.5
In this study, the concentration of dissolved oxygen (DO) at different water depths in a small river connected to the Nakdong River was monitored with parallel jet streamer device to improve water quality. DO probes were installed in correspondence of the upper, middle, and lower sections of the river at the different depths and operated for 2 months. To determine the stagnation of water in the river, we produced DO graphs for different depth intervals. Overall, we prepared 343 graphs, identifying 7 intervals with characteristic dissolved oxygen concentrations, including a stagnant zone. We separately applied an artificial neural network (ANN) and a convolution neural network as learning models: in the first case, a correct answer rate of only 29.2% was obtained from the derived weight and bias, while in the second case it corresponded to 94.5%. The learning graphs were randomly selected from 40 to 300. The correct answer ratios were 94.8%, 91.3%, and 88.6% for 250, 200, and 50 graphs, respectively. By applying the control logic to the actual monitoring results, we decided to label as a “stagnant region” the depth interval characterized by correct answer ratios comprised between 84.9% and 83.5% (i.e., depths between 30 m and 60 m).
이재엽(Jaiyeop Lee),김일호(Ilho Kim) 한국도로학회 2015 한국도로학회논문집 Vol.17 No.5
PURPOSES : The noise, which is typically generated by fast moving vehicles, can be intercepted by installing a noise barrier with a soundproof panel. However, reflections from the panels cause secondary noise, and hence lower the effectiveness of the panels. In this study, the reduction of reflection noise by considering the shape, especially zigzag one, of the soundproof panel have been evaluated. METHODS : The simulation model used in this study was Nord2000, which simulates real-road situations effectively. Based on the simulation results, the joining angle of 133。with the pattern width (a) equal to 2 m and the projection height (b) equal to 0.5 m was adapted in the zigzag shape as the best profit designing factors. RESULTS: The measuring results at middle height, 15 m showed reduction at all points except the point with average -1.6 ㏈. At a greater height of 30 m, 2 points showed reduction. A real-sized facility was constructed to investigate the reflected sound from a zigzag shaped panel up to the height of 5 m. CONCLUSIONS: The reduction effects were detected in all the receive points in the range of 2-6 m distances and 1-5 m heights comparing the plane panel. Compared to plane panel, the noises are reduced at an average of 2.4 ㏈A.
생물학적 질소 제거를 위한 생물담체 공정의 최근 동향 - 리뷰
제스민아터 ( Jesmin Akter ),이재엽 ( Jaiyeop Lee ),김일호 ( Ilho Kim ) 한국수처리학회(구 한국수처리기술연구회) 2021 한국수처리학회지 Vol.29 No.3
Biological nitrogen (N) removal with the bio-media process has been the preferred technology and recent developments in this technology have focused on improving N removal. However, integrated fixed film activated sludge, external nitrification, membrane, aerobic granulation BNR systems and more efficient N removal bioprocesses have been developed nowadays. To achieve N removal more efficiently, methods of nitrification and denitrification have been developed by preventing nitrate formation and enforcing nitrification-denitrification over nitrite. The process requires less oxygen and organics than nitrification-denitrification over nitrate allowing lower N concentrations to be achieved for the same influent organic’s concentration and oxygen supply. Biological filtration process using the bio-media technique that utilizes micro-organisms to remove nutrients from the wastewater. A recent study has been shown that various bio-media efficiently used for the nitrification-denitrification process, also the growth of biofilm is the potential for ammonia removal. Moreover, this technology applies to a wide range and effective in removing up to 90-95% nutrients from the effluents. Therefore, the specific surface area of bio-media is available for bio-film growth depends on media types. The main purpose of this review paper is to study the application and performance of different bio-media and their removal efficiency using biological biofilm process.