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2차측 능동크램프 방식의 영전압 영전류 스위칭 풀브리지 DC-DC 컨버터
송찬일,이상일,김병철 조선대학교 에너지.자원신기술연구소 2001 에너지·자원신기술연구소 논문지 Vol.23 No.2
The zero voltage switching(ZVS) full-bridge(FB) PWM dc-dc converter is characterized by high efficiency, low switching stress and simple topology. But because of primary current in the circulating period, conducting loss of the lagging leg device occur. In this paper, a novel zero voltage and zero current switching(ZVZCS) FB Phase-Shift(PS) PWM dc-dc converter was proposed. The converter has secondary auxiliary circuit using R, L, D. The proposed secondary auxiliary circuit is simple and lossless but removes the primary current for circulating period effectively. The 50 kHz, 300 W prototype converter was experimented for verification of the converter characteristics. The proposed converter has good Characteristics of ZVZCS and high efficiency of 91%.
송찬일,박홍주 대한평형의학회 2013 Research in Vestibular Science Vol.12 No.4
Benign paroxysmal positional vertigo (BPPV) is characterized by brief recurrent episodes of vertigo triggered by head positional changes. BPPV is one of the most common causes of recurrent vertigo. BPPV results from abnormal stimulation of the cupula within any of the three semicircular canals by free-floating otoliths (canalithiasis) or otoliths adhered to the cupula (cupulolithiasis). Spontaneous recovery occurs frequently even with conservative treatment. However, canalith repositioning maneuvers are believed to be the best way to treat BPPV by moving the canaliths from the semicircular canal to the vestibule. Various treatment methods of posterior,superior, and lateral canal BPPV are discussed in this review.
송찬일,송상기,송각기 조선대학교 에너지.자원신기술연구소 2002 에너지·자원신기술연구소 논문지 Vol.24 No.2
Automobile alternator noises are composed of mechanical noise, ventilation noise and magnetic noise. The design of magnetic parts, fans, bearing, and the rotor has an effect on these noises. In running automobile alternator, these elements can generate noises and vibrations. To know the noise sources of the various alternator, the characteristics of noises are analyzed as rotating speed is increased. Also, this study analyze the harmonics of the noise for the various alternators. The results of this study can lead the instruction t o the noise reduction on the automobile alternator.
Ga_(0.6)Sb_(1.4)Se₃單結晶의 光傳導度 特性
宋燦日,劉炳守,李愚宣,金南伍,金亨坤 조선대학교 에너지.자원신기술연구소 2002 에너지·자원신기술연구소 논문지 Vol.24 No.2
Ga_(0.6)Sb_(l.4)Se₃single crystals were grown by the Bridgman technique method, These single crystals had orthorhombic structure, and lattice constant and electric conduction type of Ga_(0.6)Sb_(l.4)Se₃single crystals was a = 11.860Å , b = 12.057Å, c = 4.103Å and p-type, respectively. Direct band gap of Ga_(0.6)Sb_(l.4)Se₃single crystals obtained from optical absorption spectrum were 1.17 eV. Photoconductivity spectrum measured at 10K showed that the photoconductivity peak in Ga_(0.6)Sb_(l.4)Se₃single crystals was located in 960 nm.
송찬일,송상기,송각기 조선대학교 에너지.자원신기술연구소 2000 에너지·자원신기술연구소 논문지 Vol.22 No.2
Automobile alternator noises are composed of mechanical noise, ventilation noise and magnetic noise. The design of magnetic parts, fans, bearing, and the rotor has an effect on these noises. In running automobile alternator, these elements can generate noises and vibrations. To know the noise sources of the various alternator, the characteristics of noises are analyzed as rotating speed is increased. Also, this study analyze the harmonics of the noise for the various alternators. The results of this study can lead the instruction to the noise reduction on the automobile alternator.
SF_6의 Impulse 破壞電壓-時間特性에 對한 硏究
宋燦日 조선대학교 동력자원연구소 1984 動力資源硏究所誌 Vol.6 No.2
In this paper the impulse breakdown voltage-time characteristics of coaxial cylinder gaps in SF_6 are experimentally and theoretically investigated. The factors influencing the voltage-time curve that are systematically studied in this paper include the nature and pressure of the gas and the polarity of the impulse applied to the high voltage electrode. The breakdown time delay probability is treated as a bivariate distribution in statical and formative time lags. A systematic method is developed to relate the statistics of breakdown delays in SF_6 with their breakdown voltage-probability.
송찬일 조선대학교 에너지.자원신기술연구소 2002 에너지·자원신기술연구소 논문지 Vol.24 No.2
This paper presents the obtained ecperimental results of a research program aimed to study corona on rough surfaces. This paper models the interaction between positive coronas using sewing needles attached to a thick conductor of smooth surface. The experimental research is focused on stundying of discharge ; namely the onset and offset voltages of the pulse mode. The obtained results will be analysed and the transition from burst pulses to continuous glow in labolatory air is discussed.
2차측 능동크램프 방식의 영전압 영전류 스위칭 풀브리지 DC-DC 컨버터
송찬일,이상일,김병철 조선대학교 에너지.자원신기술연구소 2002 에너지·자원신기술연구소 논문지 Vol.24 No.2
The zero voltage switching(ZVS) full-bridge(FB) PWM dc-dc converter is characterized by high efficiency, low switching stress and simple topology. But because of primary current in the circulating period, conducting loss of the lagging leg device occur. In this paper, a novel zero voltage and zero current switching(ZVZCS) FB Phase-Shift(PS) PWM dc-dc converter was proposed. The converter has secondary auxiliary circuit using R, L, D. The proposed secondary auxiliary circuit is simple and lossless but removes the primary current for circulating period effectively. The 50kHz, 300W prototype converter was experimented for verification of the converter characteristics. The proposed converter has good characteristics of ZVZCS and high efficiency of 91%.
SF_(6)의 Impulse 破壞電壓-時間特性에 對한 硏究
宋燦日 조선대학교 에너지.자원신기술연구소 2002 에너지·자원신기술연구소 논문지 Vol.24 No.2
In this paper the impulse breakdown voltage-time characteristics of coaxial cylinder gaps in SF_(6) are experimentally and theoretically investigated. The factors influencing the voltage-time curve that are systematically studied in this paper include the nature and pressure of the gas and the polarity of the impulse applied to the high voltage electrode. The breakdown time delay probability is treated as a bivariate distribution in statical and formative time lags. A systematic method is developed to relate the statistics of breakdown delays in SF_(6) with their breakdown voltage-probability.