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탐구학습을 위한 교과서 재구성에 관한 소고 - 초등학교 4학년을 중심으로 -
김원덕,임해경 한국초등수학교육학회 2007 한국초등수학교육학회지 Vol.11 No.1
현재 초등학교 학생들은 도형 영역을 어려워하고 있으며, 학교 수학에서 배운 도형 관련 지식을 실제 생활에 잘 적용시키지 못하고 있다. 도형의 성질을 제대로 알지 못하거나 도형 사이의 포함관계를 이해하지 못하며, 전형적인 예에서 조금만 벗어나면 무슨 도형인지 알아채지 못하는 학생들이 많이 있다. 이에 본 연구에서는 학생들이 수학의 기하적 개념들을 쉽고 재미있게 학습할 수 있도록 하기 위하여 van Hiele의 이론을 바탕으로 하여 GSP를 활용할 수 있도록 교과서를 재구성하였다. 또한 재구성한 교과서가 실제 학생들의 van Hiele 수준 상승에 어떤 효과가 있는지 살펴보고, 초등학교 도형 학습에 GSP가 활발히 활용될 수 있는 계기를 마련하는데 목적이 있다. In order to help students learn geometric concepts in mathematics in an easy and interesting way, the present study restructured the textbook so that it utilizes GSP based on van Hiele's theory. In addition, we purposed to examine how effective the restructured textbook is in enhancing students' van Hiele level and to lay a base for the active use of GSP in learning figures in elementary school. In conclusion, the results of this study is expected to solve problems in the structure of the current textbook such as the violation of continuity in van Hiele's theory and inconsistency between the level of textbook contents and students' level through the restructuring of the textbook using GSP and provide helps for effective figure learning. In addition, this research is expected to be an opportunity for the active use of GSP in teaching figures in elementary school.
김대수,김원덕 三陟大學校 1996 論文集 Vol.29 No.2
지난 45년 전부터 Silane의 합성에 대한 연구는 꾸준히 행하여졌다. 이러한 Silane류는 dimethyldichlorosilane의 합성어 그 목적이었으나 아직 그것의 합성에 사용되는 미량원소에 대한 연구는 잘 알려지고 있지 않고 있다. 따라서 여기에서는 유동층 반응기을 사용하여 Si분말에 Cu, Sn, Zn을 접촉시켜 Silane류을 합성하였다. 실험결과 dimethyldichlorosilane이 89%수율로 합성되었고 Sn의 영향은 컸으며, 특히 Sn과 Zn은 상승작용이 있음을 알아내었다. Abstract-Synthesis of silanes by Direct Process is very important to the silicone industry; The method has been development over 45 past years, The goal of this synthesis was the discovery of previously unknown variables, industry trace elements, which affect product distribution and rate. Trace quantities of tin were found to affect the Direct Process profoundly, and the effect of tin and zinc were synergistic. A catalyst system consisting of copper, zinc, and tin was discovered which yielded 89% dimethyldichlorosilane with nearly complete silicon utilization. This is a major importance over the best previously reported performance.
Abyssisolibacter fermentans gen. nov. sp. nov., isolated from deep sub-seafloor sediment
김원덕,Jung-Hyun Lee,Kae Kyoung Kwon 한국미생물학회 2016 The journal of microbiology Vol.54 No.5
A Gram-staining-negative, thin rod-shaped, anaerobic bacterium designated MCWD3T was isolated from sediment of the deep sea in Ulleung Basin, East Sea, Korea. The ranges of temperature, pH and NaCl for growth of this strain were 15– 40°C (optimum 29°C), 5.0–10.0 (optimum pH 6.5), and 1–5%, respectively. The major fatty acids were iso-C15:0 (30%) and iso-C15:0 dimethyl acetal (17%). The major polar lipids were diphosphatidylglycerol, phosphatidylglycerol, phosphatidylethanolamine, and unidentified aminophospholipids, phospholipids, and aminolipids. The fermentation product from yeast extract was acetate. Phylogenetic analysis based on 16S rRNA genes indicated that the isolate was related to Sporosalibacterium faouarense (92.8% sequence identity), Clostridiisalibacter paucivorans (92.6%), and Brassicibacter mesophilus (92.4%). However, the isolate was differentiated from these genera by both physiological and chemotaxonomical properties. On the basis of a polyphasic taxonomic analysis, we propose that MCWD3T represents a novel taxon with the name Abyssisolibacter fermentans gen. nov. sp. nov.
Molybdenum Di n-butoxy Dithio Phosphate의 경계윤활 특성
강용식,김득기,김원덕 중앙대학교 기술과학연구소 1988 기술과학연구소 논문집 Vol.18 No.-
Molybdenum di n-butoxy dithio phosphate as soluble lubricating oil additive for reducing wear and friction was investigate. The boundary lubricating effects of oil solutions of molybdenum di n-butoxy dithio phosphate, zinc di n-butyl dithio phosphate, and MoS(??) suspension compared through Timken and Four-Ball tests. As the results, the extreme pressure and antiwear properties of the solution of molybdenum di n-butoxy dithio phosphate was superior than the others. Also, the antioxidation and anti-corrosion effects for copper strip of oil added molybedenum di n-butoxy dithio phosphate was excellent especially.
김원덕 삼척대학교 산업과학기술연구소 2001 産業科學技術硏究論文集 Vol.6 No.1
Study on exchange of fiber reinforced plastics. in this time, we use five kind of fibes(polyester, acryl, rayon, fiber, aramide, carbon)for reinforced ametrials. Test of tensile strength for each fiber RP by UTM, the result both of aramide fiber RP and carbon fiber RP are some higher value than glass fiber, so it is possibe to exchange of glass fiber in FRP Elongation percentage of aramide fiber RP and carbon fiber RP have some lower value than glass fiber RP, but the value is not big. In themal stress test of aramide fiber RP and carbon fiber RP are 134℃ and 137℃, the value bigger than glass fiber RP. And the value of impact test of aramide FRP are 12.2kg,cm/cm2, 12.4kg,cm/cm2 and carbon FRP are 11.5kg,cm/cm2, 10.4kg,cm/cm2, so it is some higher value than glass fiber RP. In the result of experiment, it is possible to exchange the glass fiber- for aramide fiber and carbon fiber in FRP.
식도정맥류 출혈에 내시경적 경화요법 후 합병된 상 장간막 정맥 혈전증 1예
김원덕,최광해,하정옥 영남대학교 기초/임상의학연구소 2001 Yeungnam University Journal of Medicine Vol.18 No.2
The efficacy of injection sclerotherapy for treatment of acute esophageal variceal bleeding is well established. But several complications of endoscopic sclerotherapy have been reported. One of the complications is mesenteric venous thrombosis which develops when vasopressin is used for the sclerotherapy. We report a case of superior mesenteric venous thrombosis which developed after endoscopic sclerotherapy for control of esophageal variceal bleeding.