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김덕정,이재상,구양모 대한금속·재료학회 2017 METALS AND MATERIALS International Vol.23 No.4
The in-situ blistering phenomena of the scale ‘surface’ was investigated on three carbon steels with respect to carbonand silicon concentrations, such as 0.05 wt%C, 0.2 wt%C, and 0.2 wt%C-0.2 wt%Si. The oxidation and blisteringkinetics and blister area fraction during high temperature oxidation were analyzed. The average thickness ofthe surface scale by oxidation during isothermal holding from 800 to 1200°C in dry air was observed to decreasewhen the amount of carbon increased and/or when Si was inserted additionally. Thus, the blistering behaviordepended primarily on a change in oxidation temperature (Tox) as well as amounts of carbon and silicon in thematrix. It is also revealed that such blister formation would be triggered by growth of internal stress and active generationsof CO and/or CO2 gases at the interface between the scale and matrix since carbon would result in anincrease in the blister formation by generating CO and/or CO2 gas. In addition, silicon might play an important rolein preventing the blister formation at Tox below 900°C by reducing the thickness of the surface scale whilst siliconmight enhance the blister formation by means of the appreciable micro-void formation in the scale layer at Toxhigher 900 °C.
고관절부 골절과 골송조증과의 관계 : Study of 37 cases classified by Manmohan's grade and Nordin's femur index
김덕정,최정길,권영세 최신의학사 1971 最新醫學 Vol.14 No.2
This is roentgenological analysis of osteoporosis of 37 cases of hip fracture which were treated at the department of orthopedic surgery, St. Mary' s Hospital during the period of Jan. 1965 to July 1969. The cases were analyzed for degree of osteoporosis according to Manmohan's trabecular pattern and Nordin's peripheral index of femur, in addition, cause of fracture and correlation with age and sex were reviwed. 1. There were 17 males and 20 females. 23 cases were over 51 years of age, including 15 female cases. 2. The cause of fracture was severe trauma in 12 of 14 cases under 51 years of age, and was mild trauma in 16 of 23 cases over 51 years of age. 3. All cases over 51 years of age except one, were interpreted as osteoporosis, and remaining one showed the borderline picture in trabecular pattern. 4. Nordin's femur indices which were calculated in all of our series, were corresponded to the grade of Manmohan's trabecular pattern.
Polyistotic Fibrous Dysplasia 1例 : Report of a Case
이승기,김덕정,김영조,김학현 최신의학사 1971 最新醫學 Vol.14 No.3
A case of the polyostotic polymeric fibrous dysplasia was reported with review of literatures which involved the both maxillary sinusese, mandibls, and left femur, humerus, ulna and all the metacarpals. Homogenous intramedullary bone graft was done for the treatment of the intertrochanteric fracture of the femur in this case.
학생들의 디지털 콘텐츠 불법복제에 대한 교사들의 인식과 태도에 관한 연구
김미량 ( Mi Ryang Kim ),김덕정 ( Deok Jeong Kim ) 한국컴퓨터교육학회 2012 컴퓨터교육학회 논문지 Vol.15 No.3
본 연구에서는 학생들의 디지털 콘텐츠 불법복제를 방지하기 위한 교사들의 태도와 노력에 미치는 다양한 요인을 분석하고자 하였다. 본 연구는 Ajzen과 Fishbein에 의해 개발된 합리적 행동 이론에 기반을 두고 있다. 177명의 현직 교사를 대상으로 실시한 설문 결과를 토대로 이루어졌으며, 가설 검증을 위해 PLS(Partial Least Square) 모형이 사용되었다. 검증 결과, 학생들의 디지털 콘텐츠 불법복제를 방지하기 위한 의도에 교사의 태도와 사회적 영향력이 긍정적인 영향을 미칠 것이라는 가설은 유의한 것으로 나타났다. 또한, 교사의 인식수준과 불법복제에 대한 처벌수준도 의도에 직·간접적으로 영향을 미치는 것으로 나타났다. 그러나 태도나 의도에 영향을 미칠 것으로 예상한 교사의 효능감에 대한 가설은 기각되었다. 연구 가설의 검증을 통해 결론적으로, 학술적이고 실질적인 결과들이 논의되었다. This study focuses on a comprehensive set of potential determinants of teachers` attitude and efforts for preventing students` piracy of digital contents. The proposed model is based on the theory of reasoned action, developed by Ajzen and Fishbein. The model was tested using responses from 177 teachers. Partial least square method was used to analyze the results. The hypothesized model was largely supported by this analysis, and the overall results indicate that intention for preventing students` piracy of digital contents is mostly influenced by the attitude and the social influence. The perceived level of recognition as well as the punishment for digital contents piracy has also been found to have some direct and indirect impact on the intention. But, on the contrary to our expectation, the teachers` efficacy has no influence on either the attitude or intention. As a conclusion, the academic and practical implications of these findings are discussed.