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공진형 FB DC-DC 컨버터의 정출력 제어에 관한 연구
우정인,노인배,노태균,김구형,황영민 동아대학교 생산기술연구소 1999 生産技術硏究所硏究論文集 Vol.4 No.2
Due to the development of information communication field not only the industrial electric machinrye but also the electronic·communication machinry including the computer and satelite, the interests for SMPS are increasing. Thus the low loss converter which can be operated in high speed switching is require. In this paper, a control strategy for the constant output power of resonant FB DC-DC converter in variable input voltage is proposed. The proposed control of system is I-PD type control applying type 1 digital system. The output voltage tracks the reference without any steady state error even in variable input voltage. The validity of proposed control strategy is verified by simulations using PSIM.
Colorimetric detection of ssDNA in a solution
Rho, S.,Kim, S.J.,Lee, S.C.,Chang, J.H.,Kang, H.G.,Choi, J. Elsevier 2009 Current Applied Physics Vol.9 No.2
A solution containing ssDNA was detected by using colloidal gold nanoparticles upon a color change of solution. First of all, we prepared colloidal gold nanoparticles with a size of less than 20nm by means of citrate reduction of HAuCl<SUB>4</SUB>. Since colloidal gold nanoparticles modified with citrate anions have a negative charge, they are very well dispersed in the solution due to the negative charge repulsion, showing red color. If the electrostatic repulsion is screened by additives such as NaCl, the nanoparticles start to aggregate, leading to a color alteration. We found that the color alteration is retarded when the solution contains ssDNA, which plays a role in preventing the nanoparticles from aggregation. This allows the determination of whether or not ssDNA is present in a solution. However, the color alteration is not retarded when the solution contains dsDNA.
이규승(G S Lee),이세현(S H Lee),최석준(S j Choi),권기태(K T Kwon),이정근(J G Lee),장혁진(H J Jang),황명근(M K Hwang),신상욱(S W Shin),노재엽(J Y Rho) 한국조명·전기설비학회 2010 한국조명·전기설비학회 학술대회논문집 Vol.2010 No.5월
1970년대 오일파동으로 인한 불안정한 에너지 수급과 지구 온난화와 같은 환경 문제들은 전 세계 국가들에게 신에너지 및 대체에너지 개발의 필요성을 불러일으키게 되었다. 이중 대체에너지는 청정에너지이면서 무한하여 현재 인류가 가지고 있는 문제를 해결하는데 안성맞춤인 에너지이다. 대체에너지 중에서도 미래에 발전가능성이 높으며 현재 선진국에서 전략적으로 투자하고 있는 태양광분야에서 핵심이며 치열한 연구개발이 이루어지고 있는 태양전지의 기술동향에 대해 살펴보도록 하겠다.