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RISS 인기검색어
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- 저자 : 송대현(Dai-Hyun Song) (검색결과 3 건)
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Ant Colony 알고리즘과 퍼지추론 기법을 이용한 LMTT 셔틀카의 최적 스케줄링 설계
송대현(Dai-Hyun Song) 산업기술교육훈련학회 2011 산업기술연구논문지 (JITR) Vol.16 No.1
본 논문은 항만 내에서 자동화에 적용될 수 있는 선형전동기 기반 이송장치(Linear Motor-based Transfer Technology, LMTT)의 작업 스케줄 최적화에 관하여 다루었다. 제안한 방법은 ACA(Ant Colony Algorithm)과 최적화된 퍼지추론 알고리즘을 이용하여 구현되었으며, 제안한 알고리즘은 유전자적 기법에 기반을 두고 각각의 룰을 생성하도록 구성되었다. 제안한 기법은 실제 항만모델에 적용하여 실용성의 검증이 가능하였으며, 시뮬레이션 결과를 통하여 퍼지 시스템을 통한 LMTT 이송차량의 효과적인 작업 스케줄을 결정하는 과정을 확인할 수 있었다.
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CFD 활용한 Airlift SBR내 유동담체 유동장 해석
고대현 ( Dai-hyeon Go ),송대현 ( Dae-hyun Song ),이준호 ( Jun-ho Lee ) 한국환경기술학회 2023 한국환경기술학회지 Vol.24 No.1
In the SBR with biofilm carrier system, proper sloughing of the biofilm is necessary to maintain aerobic conditions and pore space. The purpose of this study is to visualize the flow field according to the operation time by using the Realizable k-model of the CFD program to sloughing and recirculate the biofilm carrier biofilm in the React mode in the SBR device equipped with an airlift pump. As a result of creating the grid, the range of element quality is 0.50703~0.99947, the average is 0.98618, and the average surface area is 0.73257 m<sup>2</sup>. The boundary condition for Realizable κ-ε, Standard Wall Functions model, and the turbulence model factors, C<sub>2</sub> are set to 1.9, the TKE Prandtl Number to 1, and the TDR Prandtl Number to 1.2. The aeration velocity at the bottom of the SBR was fixed at 0.25 m/sec, and the flow rate of the airlift pump inlet was set at 0.5 m/sec, 1 m/sec, and 2 m/sec, and compared the change in flowfield with aeration time. As a result of air volume for the contour, it can be seen that the time for the water to reach the surface of the water gradually decreased as the air flow rate of the airlift increased. After 1.8 sec, the flow of air seems to be the same even if the intensity of the air increases. As a result of velocity u for vector, the intensity of velocity u of SBR increased as the flow rate of airlift increased. When the inlet air velocity of the airlift pump is over 1.0 m/s, it is concluded that the overgrown biofilm on the biofilm carrier will be sloughing and recycled.
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電流 궤환에 의한 인버터 驅動 誘導 電動機의 시스템 安定化에 관한 硏究
송대현,장석구,박재웅 大田産業大學校 1998 한밭대학교 논문집 Vol.15 No.1
In this study, we introduce the concept of idealized induction motor to improve the stability of induction motor systems which move under voltage PWM inverter. The inverter is applied to compensate for the terminal voltage by feeding back the load current of motor. When the voltage PWM inverter-moved induction motor is used, the content rate of harmonics is increased. But we found that this content rate can be decreased by using the stabilizing circuit. And the wave form of velocity alteration could be improved by compensating for the motor input terminal voltage through positive feed back of load current.
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