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산업용 연축전지의 충전특성실험에 근거한 축전효율 개선 알고리즘
박윤호,전순용,서보혁,Park, Yun-Ho,Jeon, Sun-Yong,Seo, Bo-Hyeok 대한전기학회 2000 전기학회논문지 D Vol.52 No.1
It is difficult to analyze the charging characteristics of the lead-acid battery, because of the influences by various non-linear and time-variant parameters. In this study, the charging characteristics of high capacity industrial lead-acid battery 630 Ah was investigated through experiments with respect to the variations of temperature and the aged state of battery during the charging process. The database of those characteristics is established from the results of experiments, and the fuzzy logic charging algorithm is suggested using them. The results of experiment shows that the industrial lead-acid batteries can be always fully charged within the saved charging time by the proposed charging control algorithm adapting to the variations of charging condition. This new charging concept will be useful for developing the advanced battery charger improving the efficiency of storing electricity.
Direct Search Methods for Nonlinear Optimization Problem used ART Theory
Son Jun Hyeok(손준혁),Seo Bo Hyeok(서보혁) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
In this paper, the search is conducted along each of the coordinate directions for finding the minimum. If e<SUB>i</SUB> is the unit vector along the coordinate direction i, we determine the value a, minimizing f(α)=f(x+αe<SUB>i</SUB>), where a is a real number. A move is made to the new point x+α<SUB>i</SUB>e<SUB>i</SUB> at the end of the search along the direction i. In an n dimensional problem, we define the search along all the directions as one stage. The function value at the end of the stage is compared to the value at the beginning of the stage in establishing the convergence. The gradient appears to be zero at point. We can safeguard this by introducing an acceleration step of one additional step along the pattern direction developed by moves along the coordinate directions.
Robust control using Analog Adaptive Resonance Theory
손준혁(Jun Hyeok Son),서보혁(Bo Hyeok Seo) 대한전기학회 2006 정보 및 제어 심포지엄 논문집 Vol.2006 No.1
In many control system applications, the system designed must not only satisfy the damping and accuracy specifications, but the control must also yield performance that is robust to external disturbance and parameter variations. We have shown that feedback in conventional control systems has the inherent ability of reducing the effects of external disturbance and parameter variations. Unfortunately, robustness with the conventional feedback configuration is achieved only with a high loop gain, which is normally detrimental to stability. The design of intelligent, autonomous machines to perform tasks that are dull, repetitive, hazardous, or that require skill, strength, or dexterity beyond the capability of humans is the ultimate goal of robotics research. This paper prove the robust control using Analog Adaptive Resonance Theorv(ART2) Algorithm about case study.