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파노라마방사선사진에서 구획별 교합면 기준선에 대한 치아근원심경사
김재덕,김진수,유충현 대한구강악안면방사선학회 2005 Imaging Science in Dentistry Vol.35 No.1
Purpose : To evaluate the stability of the segmental occlusal plane and anatomical line as the reference line for measuring the mesiodistal tooth angulation in panoramic radiography and to determine the mean angle and the range of the mesiodistal tooth angulation in Korean population with normal occlusions. Materials and Methods : Twenty nine subjects (15 men, 14 women) with normal occlusion were selected. A total of 29 panoramic radiograms were taken at normal head position and then 10 images of 5 subjects selected were repeatedly taken with repositioning 2 times at each of the head down (V-shaped occlusion) and up (horizontal occlusion) for evaluation of stability of adopted reference lines by using PM2002CC (Planmeca, Finland). The images were traced with adoption of two test reference lines and the long axes of the teeth. The mesial angles formed by each reference line and the long axes of the teeth were measured and analyzed. Results : With anatomical reference line, the mesiodistal tooth angulations of the molars showed the significant difference by over 5 degree between the normal and each changed head position. With segmented occlusal reference line, deviations of mesiodistal tooth angulations by the two changed head positions were less than 1 degree. The means, standard deviations, and maximum and minimum values of mesiodistal tooth angulations to segmental occlusal reference line on panoramic radiography were determined. Conclusion : It would appear that mesiodistal tooth angulations to segmental occlusal plane as reference line in panograms are predictable as standards of normal occlusion and useful for evaluation of tooth arrangement between adjacent teeth.
김재덕 한국교육행정학회 2003 敎育行政學硏究 Vol.21 No.4
본 연구는 신약성서에 나타난 예수의 가르침이 어떤 지도성의 특성을 강조하고 있는지 고찰하여 한국 교육 행정 지도성 연구의 새 이론적?실제적 패러다임을 제시함으로서 리더십 문제를 새롭게 조명해보고자 하는데 목적이 있다. 먼저, 이론적 기저로서 지도성의 개념 및 지도성 이론을 대략적으로 살펴보고, 다음으로는 신약성서에 나타난 예수의 리더십이 무엇인가를 알아보기 위해 서술적 내용분석방법을 이용하였다.<br/> 분석의 순서는 신약성서에 있는 예수의 가르침들 중에서 연구자가 지도성 이론과 관계된다고 판단되는 특성들을 12가지로 고찰하였다. 그 12가지의 특성은 지도자의 능력의 측면과 도덕적 측면으로 나누고, 이러한 특성들을 종합해서 다차원적 지도성으로 보았다. 결론에서는 전체를 요약하고, 5가지의 시사점을 제시하였다.<br/> <br/> The purpose of this study is to explore leadership revealed in the New Testament that has exerted a significant influence upon the substance of the spiritual and practical worlds, and to give Korean Educational Administration the theoretical and practical paradigms of ideal leadership shown through the New Testament.<br/> In order to investigate, the researcher examined this study through a Descriptive Content Analysis Method. Before discussing this research, the researcher simply illustrated the concept of leadership and various theories of leadership based on the theoretical background.<br/> Then, the researcher analyzed the leadership revealed in the New Testament. It has 12 traits which can be divided into ability aspect and morality aspect. And the researcher regarded them as Charismatic Leadership, Transformational Leadership, Moral Leadership, and Contingency Leadership Models in the perspective of organizational theory. Especially, the researcher evaluates that Moral Leadership revealed in the New Testament is much stronger than any other leadership.<br/> Therefore, the researcher concludes that. Jesus' leadership revealed in the New Testament is the most ideal and synthetical leadership in the world because it contains all kinds of models in leadership theory. The researcher suggests that the leadership revealed in the New Testament the multi leadership.<br/> Finally, the researcher has five significant suggestions as a conclusion of this study.<br/> <br/>
파노라마방사선사진에서 골형태 계측과 구내표준필름에서 구리당량치의 상관관계
김재덕,Kim Jae-Duk 대한영상치의학회 2003 Imaging Science in Dentistry Vol.33 No.3
Purpose: To determine whether the mandibular radiomorphometric indices in panoramic radiography are correlated with the bone mineral density of Cu-equivalent images in intraoral film. Materials and Methods: The bone mineral density (BMD) of the mandibular premolar area was measured in the Cu-equivalent image of intraoral film. The Panoramic Mandibular Index (PMI) and Mandibular Cortical Width (MCW) were measured in panoramic radiographs of six dry mandibles, and the Pearson correlation between PMI, MCW, and BMD were tested. Results: There were no significant correlations between PMI and BMD (r = 0.280), nor between MCW and BMD (r =0.237). Conclusion: The results show that PMI and MCW were poor diagnostic indicators of mandibular BMD in the six dry mandibles used in this study. The correlationship between the mandibular radiomorphometric indices (PMI and MCW) and mandibular BMD needs to be researched further using large in vivo patient samples.
김재덕,Kim Jae-Duk 대한영상치의학회 2002 Imaging Science in Dentistry Vol.32 No.3
Purpose: To determine the proper reference step wedge for digital Cu-Equivalent Image analyzing systems for measurement of bone density. Meterials and Methods : Radiograms of lumbar vertebrae phantom (1g/㎠) with 3 test copper step wedges of 0.03, 0.05 and, 0.1 mm thickness unit were taken and analyzed using NIH image software on a Macintosh personal computer. Measured densities of the lumbar areas in the Cu-Equivalent images made by utilizing 3 different copper stepwedges were compared with a known bone density. Results: The values of r2 for all copper equivalent images were over 0.99. The mean Cu-Eq value of lumbar in copper equivalent image made by a 0.1 mm copper stepwedge was 0.22 ± 0.06 mm and converted to hydroxyapatite density of 1.03 g/㎠. The stepwedges of 0.03 and 0.05 mm produced results having higher values than the actual known bone density. They did not show the blue and green color level that appeared in lumbar on color enhanced image. Conclusion : A copper stepwedge of adequate thickness and range of steps which can express the range of density of bone being measured should be used.
김재덕,김은철,한순구,노경호 한국화재소방학회 2004 한국화재소방학회논문지 Vol.18 No.3
The values of physical properties of the inert gases of Ar, N2, CO2 were calculated by the empirical equations. The regression coefficients were obtained by the experimental data and the resulting calculated values. For the empirical equation with a lower regression coefficient, a new correlation was suggested. At an atmosphere pressure, the empirical equation was confirmed by the experimental values for the viscosity, density, saturated pressure, and surface tension of Ar, N2, CO2. The correlation coefficients of the empirical equations proposed in this work was higher than 0.99. 불활성기체 중 할론의 대체소화제로 쓰이는 Ar, N2, CO2의 물성값을 실험식을 통하여 계산값을 구하였 다. 문헌에서 얻은 실험값을 실험식에 대입하여 얻은 계산값과 비교하여 상관계수를 구하였다. 회귀분석을 통하여 실험식에 의한 계산값과 실험값과의 일치성과 정확성을 검증하였으며 일치성이 낮은 실험식에 대 하여서는 새로운 실험식을 제안하였다. 1대기압일 때, Ar, N2, CO2의 점도, 밀도, 열용량, 표면장력에 대 한 실험값을 통하여 실험식을 검증하였으며 새로 제안된 실험식에서는 이상의 물성을 온도에 의한 함수로 표시하고 비교하였다. Ar, N2, CO2의 포화압력도 온도에 의한 함수로 표시하고 기존에 제안된 실험식과 비교하였다. 본 연구에서 제안된 실험식의 상관계수는 0.99이상이었다.