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Dong Jin Kim,Dong Ig Lee,Gi Cheol Cha,Jurg Keller 대한환경공학회 2008 Environmental Engineering Research Vol.13 No.3
Free ammonia (NH₃-N) inhibition of nitrite-oxidizing bacteria (NOB) has been widely studied for partial nitrification (or nitrite accumulation) and denitrification via nitrite (NO₂-(-N)) as a low-cost treatment of ammonium containing wastewater. The literature on NH₃-N inhibition of NOB, however, shows disagreement about the threshold NH₃-N concentration and its degree of inhibition. In order to clarify the confusion, a simple and cheap respirometric method was devised to investigate the effect of free ammonia inhibition of NOB. Sludge samples from an autotrophic nitrifying reactor were exposed to various NH₃-N concentrations to measure the maximum specific nitrite oxidation rate (K(NO)) using a respirometer. NOB biomass was estimated from the yield values in the literature. Free ammonia inhibition of nitrite oxidizing bacteria was reversible and the specific nitrite oxidation rate (KNO) decreased from 0.141 to 0.116, 0.100, 0.097 and 0.081 mg NO₂-(-N)/mg NOB·h, respectively, as the NH₃-N concentration increased from 0.0 to 1.0, 4.1, 9.7 and 22.9 mg/L. A nonlinear regression based on the noncompetitive inhibition mode gave an estimate of the Inhibition concentration (K(I)) of free ammonia to be 21.3 mg NH₃-N/L. Previous studies gave (K(NO)) of Nitrobacter and Nitrospira as 0.120 and 0.032 mg/mg VSS·h. The free ammonia concentration which inhibits Nitrobacter was 30~50 mg NH₃-N/L and Nitrospira was inhibited at 0.04~0.08 mg NH₃-N/L. The results support the fact that Nitrobacter is the dominant NOB in the reactor. The variations in the reported values of free ammonia inhibition may be due to the different species of nitrite oxidizers present in the reactors. The respirometric method provides rapid and reliable analysis of the behavior and community of the nitrite oxidizing bacteria.
Inverse Continuous Wavelets Filter Banc System
Ig Hyun CHO,Seung Houn LEE,Dong Han YOON 한국정보기술학회 2006 Proceedings of KIIT Conference Vol.2006 No.-
This paper is contributed to the inverse continuous wavelets filter banc system. The inverse continuous wavelets transform permitsto reconstruct a signal if the admissibility condition is satisfactory. Then we can obtain the new time-scale plan which is composed by a real amplitude and the scale information of a signal. This plan can be considered as an analysis filter banc system. On the other hands the original signal can be reconstructed by the simple summation of the plan. This process can be considered as a synthesis filter banc system. In this work we have been tried to establish the inverse continuous wavelets filter nab system and applied toremove noise in Ultrasonic signal.
Inverse Continuous Wavelets Filter Bank System
Ig-hyun Cho,Seung-houn Lee,Dong-han Yoon 한국정보기술학회 2006 한국정보기술학회논문지 Vol.4 No.6
This paper is contributed to the inverse continuous wavelets filter bank system. The inverse continuous wavelets transform permits to reconstruct a signal if the admissibility condition is satisfactory. Then we can obtain the new time-scale plan which is composed by a real amplitude and the scale information of a signal. This plan can be considered as an analysis filter bank system. On the other hands the original signal can be reconstructed by the simple summation of the plan. This process can be considered as a synthesis filter bank system. In this work we have been tried to establish the inverse continuous wavelets filter bank system and applied to remove noise in Ultrasonic signal.
포말부상법과 가압부상법의 고액분리 효율 비교 (I) - 표면활성물질의 영향 -
김익열 ( Ig-yeol Kim ),이경동 ( Gyeong-dong Lee ),라덕관 ( Deog-gwan Ra ) 한국환경기술학회 2012 한국환경기술학회지 Vol.13 No.4
표면활성물질을 첨가한 포말부상법과 가압부상법을 이용하여 현탁액의 고액분리 실험을 수행한 결과 다음과 같은 결론을 얻었다. 포말부상과 가압부상 실험에서 적합한 pH는 Casein 4, Gelatin 5이었다. 이때 고액분리 효율은 포말부상에서 Casein을 첨가했을 때 60.5%, Gelatin 37.4%, 가압부상에서 Casein을 첨가 했을때 74.1%, Gelatin 48.9%의 고액분리 효율을 나타내었다. 표면활성물질 첨가량이 증가할수록 고액분리 효율은 증가하였으나, 적합한 첨가량은 두 방법 모두 40mg/L정도로 나타났다. 표면활성물질을 첨가한 현탁액의 고액분리 효율은 가압부상이 포말부상에 비하여 우수하였다. 가압부상이 포말부상에 비하여 Casein을 첨가하면 13.6%, Gelatin을 첨가하면 11.5%의 고액분리효율이 증가되었고, 표면활성물질은 Casein이 Gelatin보다 우수하였다. This study was conducted to test the removal efficiency of suspended solid by dissolved air flotation adding surface active materials. Accomplished result is same as following. The optimum conditions to solid-liquid separate on each method, form flotation and dissolved air flotation, were shown pH 4 on case of casein and pH 5 on gelatin, respectively. Additionally, the efficiency of solid-liquid separation by casein and gelatin were accomplished to 60.5%, 37.4% on form flotation and 74.1%, 48.9% on dissolved air flotation. Even though the separation efficiency was increased with surface active material dosage, the optimum dosage rate was determined to 40mg/L on each method. On comparing the solid-liquid separation efficiency for surface active material added into suspension, the case of dissolved air flotation was superior to form flotation. Additionally, when the surface active materials, casein, gelatin, were added to each method, the efficiency for dissolved air flotation were increased to 13.6%, 11.5% comparing to foam flotation result. And casein was more effective in accomplishing the above result than gelatin as a surface active material.
김익열 ( Ig-yeol Kim ),김상호 ( Sang-hoo Kim ),유찬서 ( Chan-seo You ),이경동 ( Gyeong-dong Lee ),라덕관 ( Deog-gwan Ra ) 한국환경기술학회 2013 한국환경기술학회지 Vol.14 No.1
표면활성물질을 첨가한 가압부상법을 이용하여 현탁액의 제거실험을 수행하였다. 표면활성물질을 첨가한 가압부상법에서 현탁액의 제거를 위한 최적조건은 Casein을 사용한 경우pH 4, 압력 3kgf/㎠, Casein의 농도 40mg/L, 가압수량비는 0.5이었고, Gelatin을 사용한 경우 pH 5, 압력 3kgf/㎠, Gelatin의 농도 40mg/L, 가압수량비는 0.5 이었다. 이 최적조건에서 현탁액의 제거효율은 Casein이 74.1%, Gelatin은 48.9%를 나타내었다. This study was conducted to test the removal of suspended solid by dissolved air flotation. Accomplished result is same as following. The optimum removal efficiency for dissolved air flotation that was adding the surface active material was determined; pH 4, 3kgf/㎠ of pressure, 40mg/L of casein, 0.5 of pressured water flow ratio on case of casein and pH 5, 3kgf/㎠ of pressure, 40mg/L of gelatin, 0.5 for pressured water flow ratio on case of gelatin. From the optimal condition, removal efficiencies of suspended solid for case of casein and gelatin were recorded 74.17%, 48.92%, respectively.
조익현(Ig-hyun Cho),권창영(Chang-young Kwon),김정삼(Jung-sam Kim),이충호(Choong-ho Lee),윤동한(Dong-han Yoon) 한국정보기술학회 2008 한국정보기술학회논문지 Vol.6 No.4
Many digital filters have been designed previously to eliminate powerline interface, broadband noise, baseline wondering and electromyogram interface in the electrocardiogram. This paper describes filtering methods which have been developed - notch, LMS(Least Mean Square) adaptive filter, and a nonlinear adaptive noise canceller using neural network proposed in this paper. The recurrent neural network(RNN) is used as nonlinear adaptive filter in the various fields. Experimental results shows that the neural network based noise canceller outperforms the linear one. And this paper describes nonlinear dynamics in ECG processing to verify that the neural network based adaptive filter performs best with respect to noise rejection and attractor pattern.
조익현(Ig-hyun Cho),이충호(Choong-ho Lee),권창영(Chang-young Kwon),김준대(Jun-dea Kim),윤동한(Dong-han Yoon) 한국정보기술학회 2007 Proceedings of KIIT Conference Vol.2007 No.-
이 논문은 신호 f(t)의 실제적인 스케일 정보를 나타내는 웨이브렛 플랜을 중심으로 연속 웨이브렛 역변환의 특성에 대하여 논하였다. 웨이브렛 변환에 비해 역변환의 적용이 상대적으로 미비한 이유는 수치적인 연산의 복잡성에 기인한 것이며, 이 논문은 웨이브렛 역변환의 안정된 복원을 위한 방법에 대하여 연구하였다. 웨이브렛 역변환이 안정적으로 실현될 경우 신호 f(t)에 대한 실제적인 스케일 정보를 지니고있는 웨이브렛 플랜 이라는 새로운 “시간-스케일” 공간을 구할 수 있으며, 이는 완전한 멀티 필터 뱅크 시스템과 동일한 특성을 나타낸다. 즉 연속 웨이브렛 변환을 통해 신호 f(t)의 모든 스케일 성분을 독립적으로 주파수 전체 대역에 걸쳐 분산하고 다시 역변환을 통해 원래의 신호를 복원하는 과정은 필터뱅크이론의 분석(analysis)과 합성(synthesis) 과정과 일치한다. 이 논문에서는 연속 웨이브렛 역변환을 이용하여 “시간-스케일” 필터를 통한 신호 f(t)의 스케일 분해와 웨이브렛 멀티 필터 뱅크이론에 대하여 논하였다. This paper is contribute to Inverse continuous wavelets transform which permits to determine real “time-scale” plan. The application of Inverse wavelets transform is not yet represented because of the numerical difficulty. If the signal can be reconstructed stably by Inverse Continuous Wavelets Transform, the multi scale filter bank system which composed by analysis and synthesis process can be designed. In this work, we represent the Inverse Continuous Wavelets Transform which leads to nearly perfect reconstruction of signal and the multi-scale filter bank system.