지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
초록· 키워드
오류제보하기
This study suggested an optimized algorithm for detecting the loss of balance(LOB) in the seated position.
And the sensitivity analysis was performed in order to identify the role of each design variable in the algorithm. The LOB algorithm consisted of data processing of measured signals, an internal model of the central nervous system and a control error anomaly(CEA) detector. This study optimized design variables of a CEA detector to obtain improved values of the success rate(SR) of detecting the LOB and the margin time(MT) provided for preventing the falling. Nine healthy adult volunteers were involved in the experiments. All the subjects were asked to balance their body in a predescribed seated posture with the rear legs of a four-legged wooden chair. The ground reaction force from the right leg was measured from the force plate while the accelerations of the chair and the head were measured from a couple of piezoelectric accelerometers. The measured data were processed to predict the LOB using a detection algorithm. Variables S2, h2 and hd are related to the detector: S2 represents a data selecting window, h2 a time shift and hd an operating period of the LOB detection algorithm. S2 was varied from 0.1 to 10 sec with an increment of 0.1 sec, and both h2 and hd were varied from 0.01 to 1.0 sec with an increment of 0.01 sec. It was found that the SR and MT were increased by up to 9.7% and 0.497 sec comparing with the previously published case when the values of S2, h2 and hd were set to 4.5, 0.3 and 0.2 sec, respectively. Also the results of sensitivity analysis showed that S2 and h2 had considerable influence on the SR while these variables were not so sensitive to the MT.
목차
등록된 정보가 없습니다.
참고문헌 (9)
참고문헌 신청
A.A. Ahmed / 2004 / Is a loss of balance a control error signal anomaly? evidence for three-sigma failure detection in young adults / Gait and Posture 19 (3) : 252 ~ 262
A.A. Ahmed / 2007 / On use of a nominal internal model to detect a loss of balance in a maximal forward reach / Journal of Neurophysiol 97 (3) : 2439 ~ 2447
G.Wu / 2000 / Distinguishing fall activities from normal activities by velocity characteristics / Journal of Biomechanics 33 (11) : 1497 ~ 1500
M.J. Gibson / 1987 / The prevention of falls in later life / Danish Medical Bulletin 34 : 1 ~ 24
N. Noury / 2008 / A proposal for the classification and evaluation of fall detectors / Elsevier Masson France IRBM 29 (6) : 340 ~ 349
A.A. Ahmed / 2007 / On use of a nominal internal model to detect a loss of balance in a maximal forward reach / Journal of Neurophysiol 97 (3) : 2439 ~ 2447
G.Wu / 2000 / Distinguishing fall activities from normal activities by velocity characteristics / Journal of Biomechanics 33 (11) : 1497 ~ 1500
M.J. Gibson / 1987 / The prevention of falls in later life / Danish Medical Bulletin 34 : 1 ~ 24
N. Noury / 2008 / A proposal for the classification and evaluation of fall detectors / Elsevier Masson France IRBM 29 (6) : 340 ~ 349
이 논문의 저자 정보
최근 본 자료
댓글(0)
0