• 제어로봇시스템학회:학술대회논문집
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• 2003.10a
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• pp.2481-2485
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• 2003

In this paper novel concept of real reality robot game controlled by a mobile server robot is proposed. Real reality robot game means that two real robots controlled by two human operator through the internet are playing a boxing game. The mobile server robot captures playing images of the boxing game and send them to GUI on the screen of human operators’ PC. The human operator can login to boxing game from any computer in any place if he/she is permitted. Remote control of boxing robot by a motion capture system through network is implemented. Successful motion control of a boxing robot remotely controlled by a motion capture system through network can be achieved.

• 제어로봇시스템학회:학술대회논문집
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• 2003.10a
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• pp.2502-2507
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• 2003

In this paper, a crack sealing robot is developed. The crack sealing robot is built to detect, track, and seal the crack on the pavement. The sealing robot is required to brush all dirt in the crack out for preparing a better sealing job. Camera calibration has been done to get accurate crack position. In order to perform a cleaning job, the explicit force control method is used to regulate a specified desired force in order to maintain constant contact with the ground. Experimental studies of force tracking control are conducted under unknown environment stiffness and location. Crack tracking control is performed. Force tracking results are excellent and the robot finds and tracks the crack very well.

• Proceedings of the KIEE Conference
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• 2006.07d
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• pp.1753-1754
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• 2006

이 논문에서는 밀폐된 공간 내에서 발생하는 소음을 줄이기 위해 일종의 능동 소음 제어 방법을 발표한다. 제안된 제어방법은 WPFB(Wavelet Packet Filter Bank)를 이용하여 기존의 FXLMS(Filtered-X Least Mean Square) 알고리즘의 단점인, 소음 제어시스템 내에서의 소음전달의 지연으로 인한 불안정성과, 소음의 급작스런 변화에 대한 응답능력부족을 해소하는 방법이다. 이 시스템의 주요 특성은 소음제어 시스템의 이차경로에 WPFB이 삽입되어 FXLMS 알고리즘에 비해 빠른 연산이 수행된다는 것이다. 다른 말로 하면, WPFB는 병렬연산을 수행한다. 그러면, 적응 알고리즘 내에 있는 필터의 웨이트들이 더 빨리 갱신될 것이다. 또한 WPFB는 뛰어난 분해능을 가지고 있어서 아주 미세한 소음까지도 처리해 낼 수가 있다. 이 제어기법의 효율성은 simulation을 통해 증명될 것이다.

• Journal of Power Electronics
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• v.19 no.2
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• pp.591-601
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• 2019

With the development of renewable energy, grid-connected inverter technology has become an important research area. When compared with traditional silicon IGBT power devices, the silicon carbide (SiC) MOSFET shows obvious advantages in terms of its high-power density, low power loss and high-efficiency power supply system. It is suggested that this technology is highly suitable for three-phase AC motors, renewable energy vehicles, aerospace and military power supplies, etc. This paper focuses on the SiC MOSFET behaviors that concern the parasitic component influence throughout the whole working process, which is based on a three-phase grid-connected inverter. A high-speed model of power switch devices is built and theoretically analyzed. Then the power loss is determined through experimental validation.

• Polymer Science and Technology
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• v.26 no.2
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• pp.149-154
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• 2015

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2012.05a
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• pp.669-670
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• 2012

• Journal of the Korean Society for Precision Engineering
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• v.18 no.7
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• pp.27-33
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• 2001

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2006.10a
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• pp.439-440
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• 2006

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2006.10a
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• pp.75-76
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• 2006

• Proceedings of the Korean Society Of Semiconductor Equipment Technology
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• 2002.11a
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• pp.50-53
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• 2002