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윤홍철 서강대학교 철학연구소 1985 철학논집 Vol.4 No.-
現代에 있어서 主로 英ㆍ美를 中心으로 發達해 온 分析哲學은 哲學的脈絡에서 조명하여 볼 때 그 方法面에서 하나의 革命을 가져왔다고 할 수 있다. 그 方法이란 다름아닌 言語를 通한 槪念의 論理的 分析이다. 이러한 方法들이 古代의 Plato, 近代의 Leibniz, 그리고 Locke, Berkeley, Hume으로 代表되는 英國 경험론에 있어서 나타나고 있으나 現代의 分析哲學에서와 같이 論理的으로 세련되고, 다듬어진 형태의 것은 아니었으며, 哲學에 있어서의 가장 중요한 도구로 認識되지도 못했던 것 같다. 실제로 많은 哲學者들이 認定하고 있듯이 言語를 通한 槪念이 論理的 分析만이 哲學이 取해야 할 唯一한 길은 아닌 것이나 궁극적으로 哲學이 存在와 思惟와 言語의 관계를 問題 삼는 것이라면 言語의 측면에 注目함으로써 수 많은 난제들의 해결을 시도하는 것은 분명히 意味있는 作業이라 할 수 있다.
성견에서 수산화인산염 피개 IMZ임플란트와 티타늄 피개 IMZ임플란트주위의 골형성 및 골성숙 정도에 대한 비교연구
윤홍철,한동후,Yoon, Hong-Cheol,Han, Dong-Hoo 대한치과보철학회 1995 대한치과보철학회지 Vol.33 No.2
The purpose of this study was to compare the bone formation, maturation around HA-and titaniumcoated dental implants in dog. 5 hydroxyapatite coated IMZ implants and 5 titanium coated IMZ implants were placed into the previously extracted site in the mandible of 5 adults dogs. All dogs were injected intravenously Tetracycline, Alizalin red S, and Calcein for bone fluorescent labelling, After the experimental period of 16weeks, the dogs were sacrificed and tissue samples around the implants were obtained. Microscopic observations(ligth, polariged and fluorescence microscope), morphometric analysis, line profile with EPMA, and quantitative analysis for Ca,P, and Ti were performed. The results were as follows ; 1. Bone maturations around the implants were relatively lower than those of natural teeth. No significant differences in bone maturation and remodeling patterns were observed between the two implants groups. 2. Calcification of bone surrounding the implants was initiated in 8-11 weeks for HA-coated implants, while it took 11 weeks or more for Ti-coated implants. 3. Bone-to-implants contact ratio of 82.63% was recorded for HA-coated group and 72.25% for titanium coated group, with no significant difference between the two groups. 4. Bone around the implants exhibited reduced quantity of Ca and P in the $100{\mu}m$ region relative to natural teeth, while the rest of the regions showed no statistical differences. No significant differences were found between the two implant groups. 5. There was a separation of HA layer from the implant core and subsequent infiltration of inflammatory cells into the resulting space in the HA-coated implants, and evidences of phagocytosis of HA particles by macrophages. Bone calcification was more rapid around HA-coated implants compared to titanium-coated implants, but HA coated implants did not show any significant differences either in the degree of calcification or the bone-to-implant contact ratio over Ti coated implants. HA coated implants may have complications associated with HA absorption and separation of HA layer from the implant core.
우식위험도 평가에 근거한 치아우식증 관리의 임상적용 사례 및 활성화 방안
윤홍철(Hong-Cheol Yoon),최연희(Youn-Hee Choi) 대한치과의사협회 2014 대한치과의사협회지 Vol.52 No.8
The new paradigm of dentistry require the detection of caries in their earlier stages. To achieve this, a high technology detection device and systematic and organized caries management system are needed. Caries management by risk assessment (CAMBRA) model is representative caries management system that satisfied new paradigm. Dental caries prevention and treatment according to CAMBRA model is patient centered, risk based, evidence based practice. Therefore, individual caries management such as CAMBRA should be performed through accurate assessment of caries disease indicators and comprehensive assessment of caries risk factors and protective factors. Based on the CAMBRA better effectiveness of comprehensive dental caries management including non surgical treatment will be accomplished.
치주 건강 상태에 따른 치면세균막의 산 생성능력 평가에 대한 연구
민지현 ( Ji Hyun Min ),윤홍철 ( Hong Cheol Yoon ),김종관 ( Jong Kwan Kim ),강시묵 ( Si Mook Kang ),김백일 ( Baek Il Kim ) 한국치위생과학회 2015 치위생과학회지 Vol.15 No.2
The aim of this retrospective study was to evaluate the relationship between periodontal health condition and the results of a new method such as Cariview which could evaluate the acidity of dental biofilms. Fifty four subjects more than 20 years old were selected for the candidates of this study. The periodontal health conditions of the candidates were divided into 4 groups according to the assessment of X-ray and Quantitative Light-induced Fluorescence-Digital (QLF-D; Inspektor Research Systems BV) images; gingivitis, slight periodontitis, moderate periodontitis, severe periodontitis. The biofilm acidogenicity of each subject was examined using Cariview (All in ONE BIO) according to manufacturer`s instruction, and the Cariview score was calculated. The mean differences of Cariview score between 4 groups of periodontal health condition were examined by ANCOVA test with the covariance of decayed, missing, and filled teeth (DMFT) index. As a result, the mean Cariview score was different, however it was not significantly different from the 4 groups (p=0.12). The mean score was the lowest in the gingivitis group (40.54±11.01), and the highest in slight periodontitis group (57.26±20.51). In conclusion, the significant mean differences were not confirmed in Cariview score according to the periodontal health condition.
조무열,이은송,Elbert de Josselim de jong,윤홍철,김백일 대한치과의사협회 2019 대한치과의사협회지 Vol.57 No.4
Purpose: The aim of this study was to evaluate the red fluorescence characteristics of bacterial dental deposits assessed by quantitative light-induced fluorescence (QLF) technology and confirm whether the red fluorescence can distinguish and evaluate quantitatively accumulation of bacterial dental deposits. Methods: This retrospective cross-sectional study used QLF images captured at a dental clinic from January to December 2016. In each QLF image, a skilled examiner selected one region where the presence of deposits was suspected. Then, the regions were classified into three groups of not detectable deposits(ND), half detectable deposits (HD), and full detectable deposits (FD) by two examiners according to classification criteria. Only those images where the regions of bacterial dental deposits were classified identically by all examiners were used for analysis. The mean red fluorescence intensity (RFI) was defined as the mean value of R/G for all pixels in the regions. The RFI was compared between groups using Welch’s ANOVA test, and the Spearman correlation was calculated to assess the association between RFI and accumulation of deposits. Results: In this study, 351 images among the collected images of 605 subjects were finally selected. The mean age of subjects was about 44 years. The R/G values of the ND, HD and FD were 0.73, 1.26 and 1.83 respectively. There were significant differences between all groups (p<0.001), and strong positive correlation was identified between the R/G value and the accumulation of deposits (r = 0.90, p<0.001). Conclusion: The intensity of red fluorescence as observed in the QLF images correlated well with the accumulation maturation of the deposits, which indicates that the QLF technology can be used to evaluate the status of oral hygiene.