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섭동계수를 갖는 단일 자기부상 시스템의 강인한 제어기 개발에 관한 연구
이형기,변기식,신춘식,탁한호 釜山工業大學校 1991 論文集 Vol.33 No.-
A EMS(Electro Magnet Suspension) nonlinear system is linearized by using Taylor series expansion around nominal point. A method of stability analysis for a low-order characteristic equation with perturbed coefficients is proposed. A PID controller to the linearized EMS system is designed by the method. Computer simulations are carried out in the system with the controller for various masses.
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김만고,황용연,변기식 釜山工業大學校 1995 論文集 Vol.37 No.-
Modeling and reliability analysis technique of telecommunications power system is proposed. The telecommunications power system can be modeled as a serial connection of two parallel redundant systems. One is a rectifier system, and another is AC system composed of both engine alternator and commercial source. The reliability analysis is performed for three distributed power systems. The analysis shows that two engine-alternators with reduced battery reserve can be used instead of the conventional one engine-alternator with three-hour battery reserve. This technique can also be applied to the reliability analyses of other DC uninterruptible power systems.
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한상만,박한석,변기식 釜慶大學校 1998 釜慶大學校 論文集 Vol.3 No.2
Local heating transportation pipe has sensor and return lines to detect water- leakage. There are impulse and resistance comparison measurementtypes for a water-leakage detection. The impulse type shows large detection error within a measurement range. Since the resistance comparison type can find a comparative accurate single water-leakage point in the measurement range of heating pipe. it has used to detect water-leakages these days. However if the multi water-leakages are happened in the measurement range of trange of transportation pipe. the resistance comparison type shows a detection error point by the parallel resistance between a detection sensor line and ground. But the detection error will be minimized by the divided transportation pipe loops. In this research, it suggests the design of remote controlled detector which can divide a large pipe loop and a possible single water-leakage measurement process in each divided loops.
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