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치아우식활성에 의한 19세 청소년의 우식호발임계치 측정
최선락,장기완 全北大學校 齒醫學硏究所 1991 전북치대논문집 Vol.9 No.1
The author had sampled saliva and analyzed in order to investigate caries risk of Korean 19 years-old adolescence. The salivary flow rate(㎖/min) were calculated. By use of Dentobuff^?? strip(Orion Diagnostica, Espoo, Finland), buffering capacity of final pH after 5 minutes was observed. By use of Dentoculta^?? LB (Orion Diagnostica, Espoo, Finland), lactobacilli was selectively cultured. By use of Dentocult^?? SM strip(Orion Diagnostica, Espoo, Finland), Streptococcus mutans was selectively cultured. The obtained results were as follows ; 1. Simple Correlation Coefficients between DMFS and 4 each of caries risk factors was as follows ; salivary flow rate(r=-0.27, p<0.05), buffering capacity(r=-0.35, p<0.05), Streptococcus mutans(r=0.29, p<0.01), Lactobacilli(r=0.50, p<0.01). 2. Multiple Correlation between DMFS and 4 caries predisposing factors was statistically significant(r=0.47, p<0.01). 3. The border lines of 4 caries risk factors were as follows ; salivary flow rate 1.5㎖/min, buffering capacity pH 5.0 after 5 mins, S. Mutans 10^5 CFU/㎖, Lactovbacilli 10^4 CFU/㎖.
최선락,이주철,김동식,Choi, Sun-Rock,Lee, Joo-Chul,Kim, Dong-Sik 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.9
The mirage technique is proved to be powerful in measuring the thermal diffusivity of materials. In particular, its contactless nature makes it suitable for delicate samples and microscale structures. In this study, thermal-wave-coupling method is developed in a general form for both thermally thin and thick samples. In the suggested measuring scheme, the probe beam can be positioned close to the pump beam and the absolute position need not be measured. Therefore the new scheme provides a relatively simple yet effective way to determine the thermal diffusivity of thermally thick samples. Thermal diffusivities of bulk samples like Ni and Al were measured and the characteristics of mirage signal for a thin film were observed by using the mirage experimental setup. The apparent thermal diffusivity was measured by varying such parameters as probe beam height, size of pump beam, power of pump beam, and surface condition of sample. From the practical standpoint, it is shown that the size of the pump beam is the most important factor for accurate thermaldiffusivity measurement. Experiments using thin-film samples show that the thermal diffusivity of a substrate covered with thin film can be measured by photothermal mirage signals.