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李根培,柳錦善 중앙대학교 기술과학연구소 1986 기술과학연구소 논문집 Vol.16 No.-
This research has been performed on the purpose to reveal the reaction order and to examine how temperature, concentration, feed ratio, flow rate and space velocity effect on the conversion in using Nickel catalyst to convert toxic CO-gas into CO₂. This experiment shows that the conversion ratio of NiO, Ni₂O₃, and NiOCuO catalyst increased until 260℃ but it retained the same value over 260℃. The conversion ratio becomes almost perfect in ratio, On the other hand, NiO catalyst showed lessed than 85% of conversion at ratio even though temperature increased more. The experiment of concentration dependance with CO concentration fixed and O₂concentration varied, the conversion ratio develops keeping up with the increase of concentration of Oxygen, and at a certain fixed concentration, above 30ml/min, it keeps constant. At the same condition, though flow rate increases on the contrary conversion ratio decreases. Feed ratio of source good for conversion was revealed as range from 1.0 to 1.5 of CO/O₂ ratio when I experimented it within 0.5 and 2.5, and this fact shows that the reaction needs a little more excessive oxyge, Furthermore, I could see that under excessive oxygen the conversion reaction of CO is the first order reaction. It was discovered that the activity energy of NiOCuO catalysit is stronger than that of any others.
프로토타이프를 사용한 사용성평가의 유효성 검증 : 전자렌지 프로토타이프의 경우 A case of microwave oven prototype
박재희,유금선,정주호,박소영,정광태 한국경영과학회 1998 한국경영과학회 학술대회논문집 Vol.- No.1
Due to the cost effectiveness, the computer-generated prototypes have been introduced in usability tests instead of real products. Recently, prototyping technologies enabled prototypes not only be looked as same as real products but also be responded as similar as those. However, few studies have shown that prototypes could produce the similar behaviors as real products. The objective of this study was to validate whether prototypes could replace real products as a test material in usability tests. Twelve female subjects participated in a between-subjects experiment with a microwave oven and a prototype of it. The results showed the subjects in the prototype condition had the larger task completion time and the greater number of buttons, suggesting the prototype was more difficult than the real product. Some causes of the differences were discussed and further research was suggested to diminish the differences.
정광태,박재희,유금선,Jeong, Gwang-Tae,Park, Jae-Hui,Yu, Geum-Seon 대한인간공학회 1999 大韓人間工學會誌 Vol.18 No.2
User's characteristics on the screen adjustment of color TV were studied. Two experiments were performed. In the first experiment, the characteristic of screen adjustment according to TV program, ambient luminance, and gender was investigated. Twenty subjects (10 females and 10 males) were participated in this experiment. Set points of brightness, contrast, tint, and color were measured on TV screen and analyzed. Brightness and contrast were significant on gender at significant level 0.01 and color was significant on gender at significant level 0.1. Tint was significant on program at significant level 0.01. The second experiment was performed to supplement the first experiment. The influences of ambient luminance, presented image, screen setting criteria, and gender were investigated. We simplified the first experiment in the second one. We restricted dependent variables (screen control variables) to only two, brightness and contrast. Other control variables were fixed to middle values. Brightness and contrast were significant on gender and screen setting criteria at significant level 0.01. In conclusion, we found that ambient luminance and presented image had no significant effects on TV screen adjustment and TV program had only a significant effect on tint. However, we found that gender and screen setting criteria had significant effects in most conditions.