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김효하(Hou-Ha Kim),이계영(Kae-Young Lee),이영주(Young-Ju Lee),이희숙(Hee-Sook Lee) 충북대학교 생활과학연구소 2004 생활과학연구논총 Vol.8 No.2
The purpose of this study was to find the problems of shops’ services on campus in Chungbuk National University and give some suggestions for shop services improvements, Questionnaires research method was conducted in August 9, 2004 and 100 Chungbuk National University students were selected. The main results were as following; Fisrst, cafeteria has some problems such as sanitation, bad taste, and low variety of food. Second, book store has some problems such as high price, and lack of space and number of computers. Third, bank has some problems such as too much wait long and low number of teller. Fourth, beauty shop has some problems such as lack of skill for stylish hair, giving service, and uncomfortable chair. Firth, bakery has some problems such as number of chair and uncomfortable chair.
MgO 포화 CaO-SiO_2- Al_2O_3 -CaF_2계 슬래그에 의한 탈황반응
심상철,이계영,김기성 대한금속재료학회 2002 대한금속·재료학회지 Vol.40 No.2
In order to produce low sulfur steel, an optimum ladle slag composition was investigated as a function of CaO/Al_2O_3 (mass%) ratio and (T.Fe+MnO) content of the ladle slag. The effects of CaF_2 addition and ladle slag recycling on the desulfurization rate were also studied. An optimum value of CaO/Al_2O_3 ratio for desulfurization was 1.6∼1.7 and desulfurization reaction was enhanced when T.Fe + MnO was less than 1 mass%. The desulfurization rate constant (K) increase by the increase in the CaO/Al_2O_3 (mass%/mass%) ratio until 1.7 and it decrease afterward. However, desulfurization rate constant (K) did not show decreasing trend over 1.7 (CaO/Al_2O_3 ratio) when recycled ladle slag or CaF_2 was added.