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권상/권하 속도가 큰 경우 크레인의 비선형 무진동 제어
이호훈,전종학,최승갑,Lee, Ho-Hun,Jeon, Jong-Hak,Choe, Seung-Gap 대한기계학회 2001 大韓機械學會論文集A Vol.25 No.9
This paper proposes a new approach for the ant-swing control of overhead cranes. The proposed control consists of a model-based anti-swing control scheme and a practical path planning scheme. The anti-swing control scheme is designed based on the Lyapunov stability theorem; the proposed control does not require the usual constraints of small load mass, small load swing, slow hoisting speed, and small hoisting distance, but guarantees asymptotic stability while keeping all internal signals bounded. The path planning scheme is designed based on the concepts of minimum-time control and anti-swing control; the proposed path planning generates near-minimum-time trajectories independently of hoisting speed and distance. The effectiveness of the proposed control is shown by computer simulation.
Fuzzy 로직에 의한 3차원 천정크레인의 무진동 제어
이호훈,김현기,Lee, Ho-Hun,Kim, Hyeon-Gi 대한기계학회 2001 大韓機械學會論文集A Vol.25 No.9
In this paper, a new fuzzy-logic anti-swing control scheme is proposed for a three-dimensional overhead crane. The proposed control consists of a position servo control and a fuzzy-logic control. The position servo control is used to control the trolley position and rope length, and the fuzzy-logic control is used to suppress load swing. The proposed control guarantees not only prompt suppression of load swing but also accurate control of trolley position and rope length for the simultaneous travel, traverse, and hoisting motions of the crane. The effectiveness of the proposed control is shown by experiments with a prototype three-dimensional overhead crane.
이호훈,김현기,Lee, Ho-Hun,Kim, Hyeon-Gi 대한기계학회 2000 大韓機械學會論文集A Vol.24 No.7
This paper proposes a new adaptive control scheme for flexible-link robots. A model-based nonlinear control scheme is designed based on a V-shape Lyapunov function, and then the nonlinear control i s extended to a model-based adaptive control to cope with parametric uncertainties in the dynamic model. The proposed control guarantees the global exponential or global asymptotic stability of the overall control system with all internal signals bounded. The effectiveness of the proposed control is shown by computer simulation.
이호훈(Ho-Hun Lee),이대종(Dae-Jong Lee),전명근(Myung-Geun Chun) 대한전기학회 2016 전기학회논문지 P Vol.65 No.1
According to the development of depth sensing devices and depth estimation technology, depth information becomes more important for object detection in computer vision. In terms of recognition rate, pedestrian detection methods have been improved more accurately. However, the methods makes slower detection time. So, many researches have overcome this problem by using GPU. Here, we propose a real-time pedestrian detection algorithm that does not rely on GPU. First, the depth-weighted distance map is used for detecting expected human regions. Next, human detection is performed on the regions. The performance for the proposed approach is evaluated and compared with the previous methods. We show that proposed method can detect human about 7 times faster than conventional ones.
EMS Al-Mg-Si/Al 하이브리드 합금의 계면에 미치는 열처리의 영향
이호훈(Ho Hun Lee),박성진(Sung-Jin Park),김종호(Jong-Ho Kim),박준표(Jun-Pyo Park),장시영(Si Young Chang) 한국소성가공학회 2013 한국소성가공학회 학술대회 논문집 Vol.2013 No.10
Al-Mg-Si/Al hybrid alloy was fabricated by Duo-casting, which is subject to the electromagnetic stirring(EMS), and the effect of heat treatment on interfacial characteristics was studied. After fabricating the hybrid alloy, some specimens were annealed at 100, 300 and 500℃ for 1h. And the other specimens were T6 treated (solution treatment at 500℃ for 1h, and aging at 160℃ for 5h). To investigate the effect of heat treatment, microstructure was observed by optical microscopy and scanning electron microscopy, and microhardness was measured. As annealing temperature increased, grain size of Al-Mg-Si alloy increased, and T6 heat treated Al-Mg-Si alloy showed a slight change in grain size. Near the macrointerface of hybrid alloy, microhardness increased gradually from pure Al side to Al-Mg-Si alloy side.