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박희성(Hee-Sung Park),장성수(Sung-Soo Jang),박성우(Sung-Woo Park),장진백(Jin-Baek Jang),이종인(Jong-In Lee) 전력전자학회 2004 전력전자학술대회 논문집 Vol.- No.-
In this paper, the simple analog MPPT(Maximum Power Point Tracking) algorithm is proposed for the solar array of KOMPSAT(Korea Multi-Purpose Satellite). This method doesn't need any calculation of power by multiplication of voltage and current and a measurement of the solar array temperature. It is consist of only two sample and hold circuits, two comparators, a flip-flop, and an integrator. The proposed MPPT algorithm is verified by the simulation for the 100[W] solar array.
박희성(Hee-Sung Park),박성우(Sung-Woo Park),장성수(Sung-Soo Jang),장진백(Jin-Baek Jang),성세진(Se-Jin Seong) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.11
This paper deals with the development of the PMSM(Permanent magnet synchronous motor) system for the electrical actuator. For the high control performance and reliability of PMSM, accurate information of rotor position is essential. Most of PMSM for the position control use the encoder or resolver for the information of rotor position. But these are very expensive.<br/> So, in this paper, using of the magnetic and linear hall-effect sensor is proposed. It can reduce the cost of motor systems and get the good performance of PMSM control
박희성(Hee-Sung Park),박성우(Sung-Woo Park),장진백(Jin-Bak Jang),장성수(Sung-Soo Jang),이상곤(Sang-Kon Lee) 전력전자학회 2008 전력전자학술대회 논문집 Vol.- No.-
인공위성의 전장품들은 전장품의 특성에 적합한 전력 형태를 요구하고, 전력계에서는 이러한 다양한 전력 분배 요구에 따라 전력을 공급해야한다. 또한, 전장품의 오동작이 타 전장품에 영향을 미치지 못하도록 차단하는 안전장치를 기본적으로 갖추어야 한다. 본 논문에서는 인공위성의 전장품들이 요구하는 전력 분배 방식을 구분하고, 이에 적합한 안전장치를 갖는 분배 모듈의 설계에 관해 기술한다.
박희성 ( Hee Sung Park ) 대구가톨릭대학교 자연과학연구소 2014 자연과학연구논문집 Vol.12 No.1
Long-term storage of pollen grains were investigated in order to keep their viability for in vitro growth and transformation. Petroleum ether, n-heptane, cyclohexane and benzene, as pollen collection medium, were determined less toxic to pollen growth in vitro than others tested. Pollen grains lost their activity if stored in these solvents more than a week. However, a serial performance of pollen grain collection in these solvents, air-drying and immediate transfer to low temperature condition could keep pollen viability for a longer period. After long-term storage, the stored pollen grains was successfully transformed in vitro using Agrobacterium method.