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조정민,전기영,함년근,이승환,이훈구,한경희 명지대학교 대학원 1999 대학원논문집 Vol.3 No.-
The conventional PI controller are fragile in parameter variation and load-variation. Therefore, in this paper, a speed control algorithm based on the Fuzzy PI controller is proposed for the high performance speed control of a voltage ?? inverter to drive 3-phase induction motors. The computer simulation and experiment results show that the proposed controller are more excellent control characteristics than conventional PI controller in transient-state and steady-state response.
다중 제어루프에 의한 자기부상용 DC-DC 전원장치에 관한 연구
조주현,조정민,전기영,이상집,이승환,오봉환,이훈구,한경희 明知大學校 産業技術硏究所 2004 産業技術硏究所論文集 Vol.23 No.-
The author present a modified multi-loop algorithm including feedforward for controlling a 55kW step down chopper in the power supply of Maglev. The control law for the duty cycle consists of three terms. The first is the feedforward term which compensates for variations in the input voltage. The second term consists of the difference between the slowly moving inductor current and output current. The third term consists of proportional and integral terms involving the perturbation in the output voltage. This perturvation is derived by subtracting the desired output voltage from the actual output voltage. The proportional and integral action stabilizes the system and minimizes output voltage error. In order to verify the validity of the proposed multi-loop controller, simulation study was tried using Matlab simulink.
( Hoon Jho ),( Mohammad Nazrul Islam ),( Yeon-jae Jeong ),( Jeong-hun Park ) 한국폐기물자원순환학회(구 한국폐기물학회) 2015 한국폐기물자원순환학회 3RINCs초록집 Vol.2015 No.-
Since the ocean dumping was banned in Korea in 2012, Korea government focuses on disposal of manure discharge in animal farms. Animal manure can provide nutrients for crop cultivation but, if managed in appropriately, can also have a negative impact on the environment. Due to the high pig concentrations and high off-farm disposal costs, on-farm treatment facility has been increased rapidly in Korea. Most of farms are used aeration treatment system while some of them are used with return activated sludge (RAS) treatment system. The objectives of the study were to provide information pig manure management practices and characterization of treated fertilized liquid manure (FLM) at different farms. Accordingly, FLM was subjected to analyze BOD, T-N, T-P, NO<sub>3</sub>-N, PO<sub>4</sub>-P. BOD value in FLM produced from RAS enhanced farm was in a range between 265-1,945 mg/L with an average value of 1,007 mg/L, while the average BOD of aeration treated farms was 13,476 mg/L. This value is thirteen times higher than the RAS farms. In case of T-P, the concentrations obtained were much lower in RAS treatment system than the aeration only. Based on the analysis results, 123 ton/ha/yr and 300 ton/ha/yr of FLM from RAS farms and aeration farms. Surface runoff was calculated BOD was 89 and 2,878 kg/s/ha, when using the FLM from RAS and aeration farms to maximum, respectively, are needed to meet the equivalent amount of nutrient NO<sub>3</sub> (9kg/ha/yr) for rice production. Of the investigated farms, animal farms which have the RAS treatment facility provided the better quality of FLM than ones have aeration treatment facility.