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화재에 의한 콘크리트 충전 각형강관기둥의 온도분포에 대한 유한요소 해석
서수연 ( Seo Soo-youn ),박성희 ( Park Sung-hee ),안광현 ( Ahn Kwang-hyun ),윤승조 ( Yoon Seung-jo ),최기봉 ( Choi Ki-bong ) 한국구조물진단유지관리공학회 2008 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.12 No.2
In this research, fire resisting capacity of concrete filled slender rectangular steel tube (CFT) column was evaluated according to the finite element analysis. This finite element analysis of CFT column was conducted using Adina program, version 8.5.2. As major variables, the strength of concrete, heating time, and heating plane were established. At the first place, by performing heat transfer analysis of the member having considered thermal characteristics of materials, the temperature distribution within the cross section was predicted, and having closely reviewed temperature distribution data and considered mechanical properties, the researcher examined the behavior of CFT column and its temperature distribution at the time the fire breaks out. The results from analysis indicated that, in case of one to two planes each according to the heating plane, the increase rate of minimum temperature within the cross section through the central part was about 43% when heating it for 60 minutes, and about 23% when heating it for 120 minutes, and about 23% when heating it for 180 minutes, and that, in case of two to four planes, the increase rate of minimum temperature was about 17% when heating it for 60 minutes, and 14%, for 120 minutes, and 8%, for 180 minutes.
서수연 ( Su Youn Seo ),이승훈 ( Seung Hun Lee ),김동열 ( Dong Yeol Kim ) 한국치위생학회(구 한국치위생교육학회) 2012 한국치위생학회지 Vol.12 No.6
Objectives: The purpose of this study is to research and to analyze the relationship between oral health state of infants and oral health awareness of their parents. Methods: The study has been conducted for 196 infants ranging from the age 18 to 60 month and their parents who have visited three dental clinics in Gyeongju city. The questionnaire has been made to identify the parents` oral health knowledge and behavior, while the dentist has examined the dental care, toothbrushing, and malocclusion of infants. Results: According to the results, it has been found out that there is correlation between subject`s health status and oral health status where the higher point of subject`s health status lead to the point of oral health status accordingly. Also it has been additionally recognized that there is the relationship between the awareness of parents and the oral health status of their infants in the same way. Conclusions: The parents who have low oral health awareness are required by oral health professionals to be provided with information on infant oral health, in order to promote and to maintain healthy oral status of their infants. And the specific training on method how to care oral health is needed. In addition, the government should take the detailed measures by extending infant`s medical benefits to draw their attention to the issue.