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최명호,조병서,이남재,윤장완,한병성 전북대학교 공업기술연구소 1998 工學硏究 Vol.29 No.-
In this paper, the low wattage electronic ballast for double ended 70W metal halide lamp has been investigated. To prevent a physical destruction of lamp from acoustic resonances, the proposed ballast operates at high frequency(200KHz) range square-wave alternating voltage to a metal halide lamp, reduce the start up time of lamp and electric power consumption. Besides ac voltage prevent wearing the one of a pair electrode in arc discharging. As a result, this lamp experiment shows 82W and 0.34A imput power and tube current, respectively. Lamp luminous flux is 5300lm with 82W input power and ballast efficiency is 64.63lm/w. The average starting time and restarting time of lamp are 3.9 min and 4.5 minute, respectively.
스피넬 Li_1-xMn_2O_4(0≤x≤0.075) 의 전기화학적 특성
한태희,이종배,김성호,송재주,윤장완,한병성 전북대학교 공업기술연구소 1998 工學硏究 Vol.30 No.-
The spinel Li_1-_xMn_2O_4 has been synthesized by the solid-state reaction. Li_1-_xMn_2O_4 which includes a mixture of LiOH․H_2O and MnO_2 prepared by preliminary heating at 350℃ for 12hr. Li_1-_xMn_2O_4 fired at temperature range from 750℃ for 48hr. The structure and the electrochemical characteristics of spinel to Li_1-_xMn_2O_4 which is fabricated by changing sintering condition form starting materials are investigated. The cyclic voltammetric measurement was performed using 3 electrode cells. Electrode specific capacity and cycle life behavior were tested in a 3.0~4.2V range at a constant current denstiy of 0.45mA/㎠. To improve the cycle performance of spinel Li_1-_xMn_2O_4 as the cathode of 4V class lithium secondary batteries, spinel phases Li_1-_xMn_2O_4 were prepared at various lithium. The results showed that discharge capacity of Li_1-_xMn_2O_4 varied at lithium quantity decrease with increasing lithium add quantity. The discharge capacities of Li_0.925-Mn_2O_4 and Li-Mn_2O_4 revealed 108 and 117mAg/g, respectively.