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FDM에서 Build Orientation이 쾌속조형물의 표면에 미치는 영향
전재억,서진호,권광진,권혁준,정진서,하만경 한국공작기계학회 2002 한국공작기계학회 춘계학술대회논문집 Vol.2002 No.-
Fused deposition (FD) modeling by Stratasys Inc., is one of the material deposition subfamilies of solid freeform fabrication (SFF) technologies. In this process, build material in the form of a flexible filament, is heated to a semi-liquid state and extruded from a controlled deposition head onto a fixtureless table in a temperature controlled environment. The position of nozzle is computer controlled relative to the base, which allows geometric complex models to be made to precise dimensions. FDM provide what the part was directly tested by the worker. It provide believable data. This Study is identify to surface roughness by build orientation adjustment. So, the paper is the study on surface roughness by build orientation at FDM.
과학수업모형의 비교 분석 및 내용과 활동 유형에 따른 적정 과학수업모형의 고안
정완호,권재술,최병순,정진우,김효남,허명 한국교원대학교 과학교육연구소 1996 청람과학교육연구논총 Vol.6 No.1
The purpose of this study is to develop appropriate science teaching models which can be applied effectively to relevant situations. Five science teaching models; cognitive conflict teaching model, generative teaching model, learning cycle teaching model, hypothesis verification teaching model and discovery teaching model, were identified from the existing models. The teaching models were modified and in primary and secondary students using a nonequivalent pretest-posttest control group design. Major findings of this study were as follows: 1. For teaching science concepts, three teaching models were found more effective; cognitive conflict teaching model, generative teaching model and discovery teaching model. 2. For teaching inquiry skills, two teaching models were found more effective; learning cycle teaching model and hypothesis verification teaching model. 3. For teaching scientific attitudes, two teaching models were found more effective; learning cycle teaching model and discovery teaching model. Each teaching model requires specific learning environment. It is strongly suggested that teachers should select a suitable teaching model carefully after evaluating the learning environment including teacher and student variables, learning objectives and curricular materials.
정팔진,김민정,권지영,정진필 全北大學校 附設 都市및環境硏究所 1999 都市 및 環境硏究 Vol.14 No.1
This study was performed in order to investigate organic matters and nutrieny contents of sediment on the Ik-san stream. Samples were collected 2 times during this study period at 5 points. The results were as follows ; The concentration of COD in the sediments were "Nonpolluted" by criteria of EPA. But the contents of volatile solids in the sediment were over 8%, "heavy polluted" by criteria of EPA. The concentration of Niitrogen in the sediments were "Nonpolluted" by criteria of EPA. And the concentration of T-P in the sediments were "Nonpolluted" by criteria of EPA. Therefore, it is surveyed that the sediments of Ik-san stream not yet polluted.
FDM 장치에서 주사량과 시제품의 경사가 표면거칠기에 미치는 영향
권광진,전재억,정진서,김광희,하만경 한국공작기계학회 2001 한국공작기계학회 춘계학술대회논문집 Vol.2001 No.-
Competitive power is rapidly manufacture product required consumers. Therefore, modern industry have changed from small item many production to many item small production. rapid production is necessary thing at the product development. Thus, rapid prototyping is appeared. If the graphic model was made by CAD, the production can be made in short term. That provide what the part was directly tested by the worker. It provide believable data. This study is experiment on surface roughness of part at FDM
천안백석매립장을 중심으로 한 메탄가스 발생량에 관한 연구
정진도,김장우,정인권,배찬열 한국환경과학회 2004 한국환경과학회지 Vol.13 No.7
Most of methane gas result from waste matter in landfill, therefore the persons concerned take an increasing interest in management of gases in landfill. Infrared Gas Analyzer was used to measure components of gases, CH₄,CO₂, O₂, through gas exhausted pipe. To measure amount of the gas flow meter(Portable Hot-Line Current Meter) was used and it was set at right angles with direction of the flow. In this research the total amount of methane gas produced in Beck-Suk Landfill was calculated through FOD method suggested by IPCC. This research found that in Chon-An Beck-Suk Landfill anaerobic resolution was made actively and the amount of methane gas produced there was 54.14%, which is higher than common figure, 50%, in other researches. The components of reclaimed waste matter, especially, organic waste matter can have a great effect of the amount of the greenhouse gases produced in landfill. We can expect that the amount of greenhouse gas will decrease from 2005, when it will be prohibited from carrying kitchen refuse and sludge into landfill.
한국 초·중·고등학생들의 측두하악장애 유병상태와 악안면외상과의 관련성
정기호,권호근,김진범,최충호 대한구강보건학회 2003 大韓口腔保健學會誌 Vol.27 No.2
The purpose of this population-based epidemiologic study was to clarify the tempromandibular disorders prevalence, the maxillofacial trauma experience rate and the relation between maxillofacial truma and tempromandibular discorders in 6-14 and 16 years old korean children who were selected through the stratified random sampling method. the results are as follows; 1. The prevalence of tempromandibular clicking sounds was 1.28% in elementary students, 11.05% in middle school students, 20.07% in high school students, with an overall 6.30%. The result of the statistical test showed that girls experienced more tempromandibular clicking sounds than boys(p<0.05). 2. The prevalence of tempromandibular pain was 0.51% in elementary students, 1.95% in middle school students, 7.04% in high school students, with an overall 20.07%. 3. The prevalence in mouth opening limitation was 0.04% in elementary students, 1.36% in middle school students, 5.85% in high school students, with an overall 1.06%. 4. The percentage of treatment experience for the tempromandibular disorders was 0.00% in elementary students, 0.77% in middle school students, 2.12% in high school students, with an overall 0.46% 5. The maxillofacial trauma experience rate was 5.45% in elementary students, 9.11% in middle school students, and 11.89% in high school students, with an overall 7.22%. Males experienced more maxillofacial trauma than females(p<0.01), and urban students experienced more than rural students)p<0.05). 6. The results of the relation betwwen maxillofacial trauma and tempromandibuar disorders showed there were statistically significant realtionship between the tempromandibular experience and the clicking sound(odds ratio 1.86), and between the maxillofacial trauma and tempromandibular disorders(odds ratio 1.79).
새로운 5-Fluorourcil 유도체의 합성 및 항암성
尹容鎭,權重武,金順一 慶尙大學校 1992 論文集 Vol.31 No.2
Some N1-substituted 5-fluorouracil derivatives containing-CH2COXR(X=O or N : R= peptide or ester ) groups at N1-position as prodrugs have been prepared, and were also tested L-1210 and HL60 cancer cell in vitro.