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Al2O3 분산 Zn-Co-Cr 전기도금강판의 제조조건 및 내식성에 관한 연구
김상범,서수정,박현순 ( S . B . Kim,S . J . Suh,H . S . Park ) 한국열처리공학회 1993 熱處理工學會誌 Vol.6 No.2
An improvement in corrosion resistance of various types of Zn-coated steel sheets is thought to be possible with the addition of fine oxide powder to the coating. In this study the corrosion resistance of the Al₂O₃ dispersed Zn-Co-Cr electroplated steel sheet has been investigated and the results were as follows : The corrosion resistance of Al₂O₃dispersed Zn-Co-Cr electroplated steel sheets was improved by increasing the contents of Co and Cr ions, and also Al₂O₃powders in the bath because of the increased amount of Co, Cr and Al₂O₃in deposits. In the Al₂O₃dispersed Zn-Co-Cr electroplated steels sheet, the structure of deposits was changed from fine microstructure as observed in high Co containing deposits to coarse microstructure as in high Cr and Al₂O₃containing deposits. By cold rolling of the Al₂O₃dispersed Zn-Co-Cr electroplated steel sheets to about 2 percent, thr corrosion resistance was improved further.
EEFL BLU 구동용 인버터 최적화 설계에 대한 연구
김상범(S B Kim),이상훈(S H Lee),강준길(J G Kang),조미령(M R Cho),신상욱(S W Shin),이세현(S H Lee),황명근(M K Hwang),양승용(S Y Yang) 한국조명·전기설비학회 2006 한국조명·전기설비학회 학술대회논문집 Vol.2006 No.5월
EEFL(External Electrode Fluorescent Lamp) for LCD displays are analyzed on electrical and optical characteristics by various electrode length. The electrodes of EEFL are coated at the outside of the glass tube. Brightness and efficiency of the EEFL are affected on lamp impedance characteristic. So, the experimental models are proposed for analysis and measurements of the brightness and efficiency of the lamps according to the electrode length. The sample of LCD backlight unit is used for these experiments, EEFL arrayed BLU of 32" for commercial TV display. The parameters of the experiments were quantised for simple result reading as the length of electrodes as 15, 23 and 30 ㎜. The inverter was designed and manufactured in the laboratory as the Full-Bridge switching inverter. The feature of the output were measured on voltages about 1000 - 1400V at the currents of 11 - 29 mA and the brightness 15,000 cd/㎡ - 40,000 cd/㎡. The experiments have shown that the brightness are increased by increasing of the electrode lengths which have the lamp currents increased. But at an certain conditions, the brightness and efficiency were decreased because of unmatched between the inverter output and lamp impedance. The optimum applications of the EEFL BLU of 32" in this experiments have been shown to choose the parameters for driving frequencies of 100 ㎑ - 150 ㎑, the brightness of 18,000 - 19,000 cd/㎡ and efficiencies of 40 - 45 lm/w.