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안태영 청주대학교 산업과학연구소 2002 産業科學硏究 Vol.20 No.1
This paper presents a novel transformer with a new plastic magnetic core for switching power supplies. The proposed plastic magnetic core was realized using a simple manufacturing process and it can be easily designed with various shapes, suggesting that the manufacturing cost of a power transformer can be reduced using the proposed plastic magnetic core. The possible application potentials of the proposed transformer with the plastic magnetic core are explored.
안태영 청주대학교 산업과학연구소 2002 産業科學硏究 Vol.20 No.1
Very small manually wound transformers for sub watt DC-DC converters are notorious for their relatively high cost and low reliability. This paper describes the modeling and experimental results of PCB transformer using a multi layer printed circuit board that can be used for power conversion at high frequency operation with low output power. PCB transformers using a multi layer printed circuit board eliminate several problems of their core based counterparts in low power applications. The diameter of the PCB transformer is merely 30mm.
안태영 청주대학교 산업과학연구소 1998 産業科學硏究 Vol.16 No.-
This paper presents the stability comparison of the boost, buck-boost, buck and current fed multiple output DC-DC converters. Analytical and experimental considerations of the multiple output converters are discussed. These results are summerized as follows: (1) From the steady state analysis of the converters, It has been clarified that the main voltage conversion ratlo is proportionate to the duty ratio but, the second voltage conversion ratio has the maximum point. (2) The power conversion efficiency of the current-fed multiple output converter which has simplest scheme is higher than the buck converter. Simulration and experimental results are presented to verify the analysis. (3) With the dynamic state analysis of the converters, the transfer function verify and Routh-Hurwitz criterian of the converters have been obtained and compared with 4 type converters in other to show the excellent stability of the current fed converter.
안태영 단국대학교 1999 論文集 Vol.34 No.-
Environmental factors were investigated at an outlet station of Cheonho reservoir from July 10th to July 26th in 1995. Water temperature was maintained at 24∼25℃ and pH was an alkaline with a ranged of 8.2∼9.9 for the investigation period. The concentration of nitrite was ranged from 22 to 262 ㎍/ℓ and that of inorganic phosphate was low in spite of the highest concentration of inlet stream. The chlorophll-a concentration rapidly decreased with precipitation and then gradually increased to 157 ㎍/ℓ at second week. Inorganic phosphate was correlated negatively with chlorophyll-a. The number of heterotrophic bacteria was not correlated with precipitation and remained stable at 2.6∼7.0×10 exp(4) CFU/㎖. Glucose uptake rate varied from 30 to 60%/h and increased with increasing precipitation.
낙동강 하구의 미생물 분포와 활성에 미치는 환경요인의 통계적 분석
안태영 한국미생물학회 1989 微生物과 産業 Vol.15 No.1
자연수계 생태계는 해양, 하천, 호수, 지하수 등과 같이 그 특성에 따라 많은 종류로 구분할 수 있는데, 그중에서 하구는 물리, 화학적 성질은 물론 미생물을 포함한 많은 생물이 끊임없이 변천(transition)하는 생태계의 하나의 꼽을 수 있다. 환경의 변화는 수온, 염분, pH, Eh, 투명도, 부유물질 등의 변화를 포함하는데, 하구 감조수역에서 가장 심한 변화를 일으키는 것은 일반적으로 영양염류의 양과 종류, 수온, 염분 등이다(Morita et al., 1973: Rublee et al., 1984). 그러므로 본 연구에서는 1985년 7월부터 1986년 12월까지 낙동강에 위치한 3개 정점에서 물리, 화학적 환경, 영양염류, BOD, 세균 및 heterotrophic activity의 28개 변수의 변화를 살펴보았다. 이렇게 측정된 결과를 중회귀 및 요인 분석으로 생태계에서 세균의 분포와 활성에 미치는 영향을 분석하고자 한다.