Everest from 3880

김상겸(Sang-Kyeom Kim) 한국콘크리트학회 2009 콘크리트학회지 Vol.21 No.4

국내 시판 중인 일부 탄산수의 치아 침식 가능성 평가

김상겸 ( Sang Kyeom Kim ),박석우 ( Seok Woo Park ),강시묵 ( Si Mook Kang ),권호근 ( Ho Keun Kwon ),김백일 ( Baek Il Kim ) 대한예방치과·구강보건학회 2015 大韓口腔保健學會誌 Vol.39 No.4

Objectives: The aims of this study were to determine the erosive potential of several carbonated waters and to confirm the availability of a simple ISO protocol for screening the erosive potential of drinks. Methods: A total of six carbonated waters were tested. Three products (Lemon-Sparkling water, Seagram, and Trevi) were domestic, and the other three (Perrier, San Pellegrino, and Rosbacher) were imported. Two kinds of carbonated drinks (Coca-Cola and Sprite) were used as controls. The erosive potential of each drink was assessed by measuring the initial pH (pHI), the final pH after degassing of carbon dioxide (pHF), and the titratable acidity to pH 5.5 (TA5.5) and 7.0 (TA7.0). The pH changes (ΔpH) caused by the addition of drinks to screening solutions were calculated according to the ISO protocol for evaluating the erosive potential of oral rinses. Results: The overall erosive potential of the carbonated waters was lower than that of the control drinks. The pHI and pHF of the carbonated waters ranged from 3.94 to 5.84 and from 5.07 to 7.88, respectively. The Lemon-Sparkling water showed the highest erosive potential among the carbonated waters, having the lowest pH (3.94) and the highest TA5.5 (1.67 ml). The ΔpH of all tested drinks ranged from ―1.00 to 0.23. Also, the tendency of erosive potential measured by ΔpH was similar to that measured by TA5.5. Conclusions: The carbonated waters tested in this study had a lower erosive potential than did the carbonated drinks. However, the erosive potential of domestic products was higher than that of imported products. The results of the ISO screening test could reflect the influence of the acid content as well as the pH of drinks. Therefore, this protocol could also be conveniently applied to evaluate the erosive potential of various drinks.

농촌 폐지학교의 활용유형과 활용방안에 관한 연구

김상겸(Kim, Sang-Kyeom),남태욱(Nam, Tae-Uk) 한국교육시설학회 1998 敎育施設 Vol.5 No.1

The migration from rural area to the city has been increased according to the rapid industrialization since 1960's. The decrement of students and teachers forced many elementary' schools in rural area to be abolished. In 1982, the Department of Education started to merge and abolish small schools by the law, and the total number of abolished schools reaches to about 1600 in present. But proper counterplan to the abolished schools has not made sufficiently. This study is to present the methodology for reusing the abolished schools through field survey and analysis of the using type in Chungnam Province.

공업고등학교(工業高等學校) 실습실(實習室)의 공간(空間) 구성(構成)에 관한 조사연구(調査硏究)

남궁의(NamGung, Eui),김상겸(Kim, Sang-Kyeom) 한국교육시설학회 2000 敎育施設 Vol.7 No.2

In order to make good educational circumstance of the Technical High-school, it is important that we must aware of the characteristics of technical high-school and take all considerations into the planning. This study is to plan the architectural space and path of flow in practice rooms through questionnare survey. The result are as follow. A majority of respondents recognize that the existing facility and space condition are not appropriate, because the past investment has overemphasized on the quantitative aspect. It is time to need the change of its directions toward the quantitative investment in future. It is also necessary to plan the space and the path of flow of the practice rooms in consideration of the characteristics of school.

공업고등학교 교육과정의 변천에 따른 건축 계획에 관한 연구

남궁의(Nam, Kung-Eui),김상겸(Kim, Sang-Kyeom) 한국교육시설학회 1998 敎育施設 Vol.5 No.4

The curriculum of technical high school has been revised many times during the past several decades because of the changes of educational circumstance. The educational goals in technical high school get toward the integration of theory and practice in every one course of major subjects in near future. In the usable methods of the classroom, the use of general classroom is lowered byway of the increase of the practice rate in special classroom, there by, in the situation that is high with respect to specialized curriculum and practice the classroom. Composite of curriculum is more effective. For these reasons, the architectural planning, especially the arrangement of classrooms and practice space according to the new curriculum has been more important than before.

국내 시판 중인 일부 과일 리큐어의 치아 부식능 평가

박석우(Seok-Woo Park),김상겸(Sang-Kyeom Kim),정은하(Eun-Ha Jung),권호근(Ho-Keun Kwon),김백일(Baek-Il Kim) 대한치과의사협회 2016 대한치과의사협회지 Vol.54 No.7

Purpose: The aim of this study was to evaluate the erosive potential of several fruit-flavored liquors marketed in Korea by measuring pH, titratable acidity, and variations in pH utilizing an ISO method. Materials and Methods: Six fruit-flavored liquors were investigated. An orange juice and three kinds of soju were selected as the control beverage. The pH and titratable acidity of the beverages were determined by 1 M NaOH until the pH 5.5 and 7.0 (recorded as TA5.5 and TA7.0, respectively). All measurements were performed in triplicate. The process of ISO 28888 was used for measurement of the pH variation (ΔpH) using an under-saturated hydroxyapatite solution (screening solution) and determining the difference between the initial and final pH of the screening solution. The average ΔpH was determined based on 4 measurements. Results: All the fruit-flavored liquors tested in this study showed a ΔpH lower than the critical pH for dental erosion (4.5). The average pH of the fruit-flavored liquors was 2.77 and was also lower than the pH of the soju and an orange juice (control drinks). TA5.5 and TA7.0 values of the fruit-flavored liquors were 4.92㎖ and 7.13㎖, respectively. The fruit-flavored liquors showed an erosive potential capable of damaging the enamel surfaces, whereas the orange juice had the highest titratable acidity. The changes in pH determined using the screening solution confirmed that the fruit-flavored liquors had erosive potential, with ΔpH value of 1.53. Conclusions: The fruit-flavored liquors tested in this study might have a strong potential to erode dental hard tissues.

세대별 QLF 기기의 평활면 비와동형 법랑질 우식 병소 탐지에 관한 진단정확도 비교

박석우(Seok-Woo Park),이형석(Hyung-Suk Lee),김상겸(Sang-Kyeom Kim),이은송(Eun-Song Lee),Elbert de Josselin de Jong,김백일(Baek-Il Kim) 대한치과의사협회 2018 대한치과의사협회지 Vol.56 No.1

Purpose: The aim of in vitro study was to compare the diagnostic accuracy to detect non-cavitated enamel caries on smooth surface by using four kinds of the QLF devices. Materials and Methods: A total of 52 human permanent premolars and molars were used. Fluorescence images were captured by the QLF devices (Inspektor Pro, QLF-D, Qraycam, and Qraypen). Fluorescence loss of the QLF was calculated. The severity of lesions was categorized into the following 3 scores using polarized light microscopy: normal (S), enamel demineralization to outer half of enamel (D1), and inner half of the enamel up to the dentin-enamel junction (D2). The Kruskal-Wallis test was used to compare the fluorescence loss among the QLF devices. Spearman rank correlation coefficient between histological scores and fluorescence loss of the devices was calculated. The sensitivity, specificity, and area under the receiver operating curve (AUROC) were calculated to compare their diagnostic accuracies. Results: The correlation coefficients between histological scores and the fluorescence loss of the devices showed 0.77 to 0.81 (P < 0.001). All histological scores, the fluorescence loss among the devices showed no statistical difference. Among the devices, sensitivity, specificity, and AUC values of the fluorescence loss showed 0.84 to 0.94, 0.76 to 0.90, and 0.90 to 0.92, respectively. Conclusions: All QLF devices had no difference with excellent diagnostic accuracies to detect non-cavitated enamel caries on smooth surface.