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공력해석 및 구조시험을 통한 소형 복합재 블레이드의 구조 안전성 평가
장윤정(Yun Jung Jang),정진환(Jin Hwan Jeong),이장호(Jang Ho Lee),강기원(Ki Weon Kang) 한국유체기계학회 2011 유체기계 연구개발 발표회 논문집 Vol.2011 No.11
This paper deals with the aerodynamic analysis and structural test under estimated loading condition for small composite blade, which is utilized in dual rotor wind turbine system. Firstly, the front and rear blades of dual rotor wind turbine system were modeled using reverse engineering method. And using finite volume method, the aerodynamic forces were analyzed at the rated and cutout wind speed to identify the pressure distribution on blades. And then, the full scale structural tests were conducted according to load and strength based methodology in IEC 61400-2 to identify the structural integrity of composite blade.
구조시험 및 유한요소해석을 통한 소형풍력발전용 복합재 블레이드의 구조 안전성 평가
장윤정(Yun Jung Jang),이장호(Jang Ho Lee),강기원(Ki Weon Kang) 대한기계학회 2012 大韓機械學會論文集A Vol.36 No.9
본 논문에서는 구조 시험과 유한요소해석을 통하여 소형 풍력발전용 복합재 블레이드의 구조적 안전성을 평가하였다. 먼저, 선행연구에서 공력해석을 수행하여 정격 및 극한 풍속일 때의 블레이드가 받는 굽힘 모멘트를 산출하였다. 이를 이용하여 소형풍력발전기 관련 국제 규격인 IEC 61400-2 에 따른 실규모 구조 시험을 수행하여 구조적 안전성을 평가하였다. 그리고 유한요소법을 이용한 구조 해석을 수행하여 구조 시험 결과와 비교하여 이의 정확성을 판단하였다. 또한, 구조 시험을 통해 블레이드에 대한 과잉 설계가 확인되었으며 이의 해결을 위하여 블레이드의 적층 순서 및 두께를 재선정하여 구조적 안전성을 평가하였다. This study deals with structural analysis and testing under loading conditions calculated by computational fluid dynamics for a small composite blade that is utilized in a dual rotor wind turbine system. First, the aerodynamic forces were analyzed at the rated and cutout wind speed to identify the bending moment distribution along the blade length in previous research. Then, full-scale structural tests were conducted according to IEC 61400-2 to evaluate the tructural integrity of the composite blade. These results were compared with finite element analysis to identify the accuracy of the structural analysis. Based on these results, it was revealed that the existing blade has a very high safety margin. Then, the layup of the composite blade was redesigned and analyzed using finite element analysis to achieve structural integrity and economic efficiency.
학교구강보건실 운영학교와 비운영학교 교사의 구강보건 지식과 구강건강행태
장윤정 ( Yun Jung Jang ) 한국치위생학회(구 한국치위생교육학회) 2014 한국치위생학회지 Vol.14 No.3
Objectives : The purpose of the study is to investigate the oral health knowledge and behavior in teachers with or without the school dental clinic. Methods : The subjects were 133 teachers with or without the school dental clinic in Gunsan. A self-reported questionnaire was filled out by the teachers from September 9 to November 2, 2013. The data were analyzed by SPSS version 21.0. Results : The groups were divided into two. Experimental group was school dental clinic operation group and the control group was no operation group. The experiment group showed the high score of recognition of fluoridation and sealant(p<0.01). The control group showed the high score of recognition of sealant(p<0.01). Conclusions : Continuous operation of the school dental clinic is essential to promote the lifelong oral health care in the elementary school children and the teachers. So the nationwide expansion of the continuous school dental clinic is very important to prevent the dental caries in the elementary school children.
장윤정 ( Yun Jung Jang ),김남송 ( Nam Song Kim ) 한국치위생학회 2012 한국치위생학회지 Vol.12 No.5
Objectives: The purpose of this study was to examine the impact of the systemic osteoporosis of Korean adults on their periodontal diseases and CPI index based on the data of their systemic osteoporosis. Methods: The third-year raw data of the 4th 2009 National Health & Nutrition Survey that turned out to be representative and reliable were utilized. The subjects in this study were 7,285 adults who were over the age of 19 and got both of health and dental checkups. As for data analysis, the statistical packages PASW 19.0 and SAS 9.0 were employed. Results: The most periodontal diseases were found in those who had osteoporosis in the entire parts, entire femur, femoral neck and spiral bone, but there was no significant relationship between periodontal diseases and osteoporosis. As for the connections between peridontal diseases and osteoporosis, the adults who had femoral neck osteoporosis had a 2.057-fold less bone mass than those who had a normal bone density in this part, and the former``s periodontal diseases increased in proportion to that. There was consequently a statistically significant relationship between the two(p<0.05). Among the prevalence factors of osteoporosis, a lower entire femur bone mineral density led to a lower CPI index(p<0.01), and a lower femoral neck bone mineral density led to a higher CPI index(p<0.05). Thus, there was a significant relationship between osteoporosis and the oral health indicator. Conclusions: The above-mentioned findings confirmed that in terms of the relationship among the periodontal diseases, CPI index and osteoporosis of Korean adults, a higher risk of osteoporosis affected the increase of chronic periodontal diseases.
한국 성인의 구강보건행태와 주관적인 구강건강인지 및 우식경험영구치지수와의 관련성
장윤정 ( Yun Jung Jang ),김남송 ( Nam Song Kim ) 한국치위생학회(구 한국치위생교육학회) 2011 한국치위생학회지 Vol.11 No.4
Objectives : The purpose of this study was to provide some information on down-to-earth oral health policy to improve the systemic health involving oral health and the quality of life in Korean adults. Methods : The third-year data of the 4th National Health and Nutrition Survey in 2009 were analyzed, and x²(Chi-square) test was carried out to see whether there would be any gaps in subjective oral health status according to demographic characteristics, systemic health state, frequency of eating between meals and oral health behavior. In terms of the DMFT index, one-way ANOVA was utilized, and then Scheffe post-hoc analysis was conducted. Besides, multiple regression analysis was made to grasp the relationship of oral health behavior to subjective oral health state and the DMFT index. Results : The demographic characteristics, systemic health status and oral health behavior had a significant relationship to both of subjective oral health status and the DMFT index. As a result of analyzing the relationship of oral health behavior to subjective oral health state and the DMFT index, the subfactors of oral health behavior exerted a significant independent influence on subjective oral health status and the DMFT index. Conclusions : The findings of the study suggest that in order to promote the oral health of adults, preventive measures should be taken, and systematic oral health education should be provided. As there is an increase in the elderly population in Korea, the successful implementation of senior oral health plans and the development of oral health programs geared toward adults are both required. (J Korean Soc Dent Hygiene 2011; 11(4): 499-509)