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백남규 경민대학 산학기술연구소 1999 경민대학연구논총 Vol.2 No.1
In this paper I aim at elucidating the syntactic properties of the empty operator by analyzing the relative clause construction and other constructions in which the empty operator appears. I assume that the empty operator has no intrinsic features and that it is subject to the Empty Category Principle, I also assume that there is a feature sharing rule which applies between Spec CP and C. I show that the syntactic properties of the relative clause construction and other constructions are well explained under these assumptions. This means that these assumptions are persuasive.
범량질 복합레진 수복시 접착부의 피로파괴에 관한 실험적 연구
백남규,백병주,김재곤 大韓小兒齒科學會 1993 大韓小兒齒科學會誌 Vol.20 No.2
This study was to evaluate the fatigue characteristics of composite bond to enamel surface and the effect of thermocycling on changes of bond strength and hardness of prisma AP.H. and Z100. Fatigue life was measured using the electro-magnetic type fatigue machine and the thermocycling test was conducted on the condition of 15 second dwell time each in 5。c and 55。c bath. The results obtained were summarized as follow: 1. Linear regression analysis between the stress level and the fatigue life was high negative correlation. 2. The fatigue characteristic of composite bond of Z100 was superior to Prisma AP.H. when a cyclic flexure stress was applied. 3. Tensile bond strengths were 174.26±72.98㎏/㎠ at Prisma AP.H.and 175.76±59.07㎏/㎠ at\100, and didn’t show a significant difference. The degradation of bond strength of Z100 was larger than that of Prisma AP.H. after 250 and 500 cycles. 4. Knoop hardness numbers were 52.70±1.73㎏/㎟ at Prisma AP.H. and 94.54±3.21㎏/㎟ at Z100, and showed a significant difference (p<0.01) 5. In the surface layer, cracks and micropores were observed after thermocycling.
윤현두,백남규,백병주 全北大學校 齒醫學硏究所 1991 전북치대논문집 Vol.9 No.1
The purpose of this study was investigating the shear bond strength between posterior composite resin and enamel surface of the permanent premolar. The enamels of sound permanent premolars extracted for orthodontic therapy were used for experiment. They were classified into 6 groups at random ; 2 Clearfil self-cured resin groups and 2 P-50 light-cured resin groups and 2 Clearfil light-cured resin groups which have lased group and unlased group each other. Laser impacts on each experimental groups were made at energy density of Pulsed Nd : YAG laser with 40 J/㎠. Then the decalcified patterns of enamel by 37% phosphoric acid and resin tags of each group were investigated with scanning electron microscope and adhesive shear bond strength was measured on the each decalcified enamel surface after adhesion of light-cured and self-cured resins. The obtained results were as follows. 1. There were significant increase in shear bond strength of Clearfil light-cured resin groups and Cleafil self-cured resin groups in contrast to P-50 light-cured resin groups at significant level α=0.05 in unlased condition(P<0.05). 2. There were not significant difference statistically between the groups but increased order in shear bond strength was ; Clearfil self-cured resin groups, Clearfil light-cured resin groups, P-50 light-cured resin groups in lased condition(P>0.05). 3. In case of P-50 light-cured resin groups, there was significant increase of shear bond strength at significant level α=0.01 after laser irradiation(P<0.01). In case of Clearfil light-cured resin and Clearfil self-cured resin groups, there was increase of shear bond strength but not significant statistically at significant level α=0.05 after laser irradiation(P>0.05). 4. There were significant increase in shear bond strength of Clearfil light-cured resin groups and Clearfil self-cured resin groups in contrast to P-50 light-cured resin groups at significant level α=0.05 in all groups(P<0.05). 5. The sample of high shear bond strength had many resin tags were deep and uniform penetration and the resin tags had many small tags in contrast to the sample of low shear bond strength.
주훈,백남규,백병주 大韓小兒齒科學會 1990 大韓小兒齒科學會誌 Vol.17 No.2
Odontomas are probably the most common of the odontogenic tumors, and have been defined as “a tumor composed of dentin and enamel in which pulp and cementum also are present.” Clinically, although odontomas may be discovered at any age, they developed at the same time normal odontogenic structures are differentiating. Odontomas are slow growing, nonpainful lesion that may cause local enalargement and frequently interfere with normal tooth eruption. Radiographically, odontomas are usually situated between the roots of teeth and appear either as an irregular mass of calcified material surrounded by a narrow radiolucent band with a smooth outer periphery, or as a variable number of toothlike structure with the same peripheral outline. The treatment of the odontoma is surgical removal, and there is no expectany of recurrence.