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구조물 계측 가속도로부터 변위를 재구성하기 위한 역해석 문제의 정규화 기법
홍윤화(Hong Yun-Hwa),박현우(Park Hyun-Woo),이해성(Lee Hae-Sung) 한국구조물진단유지관리학회 2007 한국구조물진단학회 학술발표회논문집 Vol.11 No.1
This paper presents a regularization scheme in time domain to reconstruct displacement history using acceleration data measured from structures. For given measured acceleration, displacement reconstruction can be defined as an elliptic boundary value problem and formulated by using least squares between measured and calculated accelerations. Unfortunately, the reconstructed displacement suffers from physically unadmissible drifts due to noise in measured acceleration and uncertainties of initial conditions. Regularization technique is employed to alleviate the unadmissible drift of reconstructed displacement. To determine an optimal regularization factor, a stable factor selection scheme is proposed. The time window concept is proposed to reduce computational costs for real time displacement reconstruction. The validity of the proposed method is demonstrated in reconstructing displacements using the numerically simulated acceleration of a two span truss bridge under earthquake and experimental acceleration of a cable with forced vibration.
구조물 계측 가속도로부터 변위를 재구성하기 위한 역해석 문제의 정규화 기법
홍윤화 ( Hong Yun-hwa ),박현우 ( Park Hyun-woo ),이해성 ( Lee Hae-sung ) 한국구조물진단유지관리공학회 2007 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.11 No.1
This paper presents a regularization scheme in time domain to reconstruct displacement history using acceleration data measured from structures. For given measured acceleration, displacement reconstruction can be defined as an elliptic boundary value problem and formulated by using least squares between measured and calculated accelerations. Unfortunately, the reconstructed displacement suffers from physically unadmissible drifts due to noise in measured acceleration and uncertainties of initial conditions. Regularization technique is employed to alleviate the unadmissible drift of reconstructed displacement. To determine an optimal regularization factor, a stable factor selection scheme is proposed. The time window concept is proposed to reduce computational costs for real time displacement reconstruction. The validity of the proposed method is demonstrated in reconstructing displacements using the numerically simulated acceleration of a two span truss bridge under earthquake and experimental acceleration of a cable with forced vibration.
사무직 남성 직장인의 연령별 식습관과 건강기능식품에 대한 인식 및 섭취 실태
홍윤화(Yun Hwa Hong),이은희(Eun Hee Lee),임현숙(Hyun Sook Lim),천종희(Jong Hee Chyun) 동아시아식생활학회 2015 동아시아식생활학회지 Vol.25 No.2
To investigate male office workers dietary habits and their perception and intake of health functional foods, 234 male employees were surveyed by questionnaire. The results were categorized into three age groups: under 35 years, 35 and 45 years, and over 45 years. The over 45 years group had significantly better dietary habits than the others (p<0.05). The most common reason for skipping breakfast was lack of time. Frequency of drinking alcohol was higher in the older group, where tiredness after drinking was lower in the younger group. The perception score of health functional foods was highest in the over 45 years group. Perception of health functional foods was more positive as the age of the groups increased (p<0.01). The number of health functional foods consumed, duration of intake, and beneficial health effects were higher in older groups. Although older people are more concerned about health than relatively younger people, they did not necessarily have reduced the amounts of smoking and drinking. Instead, they simply showed higher intakes of health functional foods to prevent and cure disease and improve their health. Therefore, older people need to receive education about their dietary and living habits instead of simply eating health functional foods. It is necessary to provide correct information about health functional foods by nutritional education.