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권혁춘,이병걸 한국환경과학회 2004 한국환경과학회지 Vol.13 No.6
The purpose of this research is to apply GIS(Geographic Information System) for the road simulation and find some benefits analysis for the design processes. The northern Jeju island was selected as a case study. The 1/5,000 digital map and GIS technique were used for optimum road design of the island based on Arc View software. Using this software we can get an overlay map by combination of hill shade map, slope map, aspect map, and building buffer map. Based on the overlay map. we designed the optimum road line and performed three dimensional simulation. From the results, we found that the developed three dimensional road simulation technique using GIS technique that was very useful tool to estimate the reasonable road design before the real road construction works.
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치근면에 항균 varnish 처치 전후의 치태 세균 및 치은열구액내 항체수준 변화에 관한 연구
권혁춘,도정욱 大韓齒科保存學會 1993 Restorative Dentistry & Endodontics Vol.18 No.2
In the prevention of root surface caries, antimicrobial therapy for the control of subgingival and supragingival plaque is seriously considered as a long term suppression of pathogenic microflora. Recently, varnishes containing antimicrobial agents have been developed to control the supragingival mocroflora. The purpose of this study was to determine the antimicrobial effects of 20% chlorhexidine varnish and 2.6% silane fouoride varnish with sealant. In clinical experiments, 12 subjects were selected from the periodontally treated patient and divided into 3 groups. after a dental prophylaxis, the subjects were treated with single application of placebo varnish(group 1), 20% cholrhexidine varnish(group II), and 2.6% silane fluoride varnish(group III). Root surface plaque samples were taken before(baseline)and one, two, four, and 8 weeks after the treatments. Microbiological examinations of root surface plaque were performed with culture study and indirect immunoflorescence(I.I.F) study, and immunological examination of gingival crevicular fluid antibody titers was performed with ELISA study. The results were as follows : 1. Pathogenic microflora on the root surface including S. murans, S. sanguis, s. mitis, A. naeslundii, A. viscosus were 24-37% on I.I.F. study. 2. S. mutans, S. sanguis, S. mitis, A. measlundii, A. viscosus of the root surface plaque was significantly reduced from I week to 8 weeks after antimicrobial varnish treatment, but showed generally increasing tendency in control group. 3. Gingival crevicular fluid antibody titers were significantly reduced from 1 or 2 weeks to 4 weeks after antimicrobial varnish treatment.
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