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李愚宣,崔昌柱,劉炳守 조선대학교 동력자원연구소 1987 動力資源硏究所誌 Vol.9 No.1
Transient analysis and performance of a dc seperately excited motor controlled by a chopper with square wave output voltage and with current limit control is described. Two methods of analysis have been dveloped. One of these methods can be used to derive a transfer function of dc seperately excited motor by a chopper with current limit control.
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.