AIM： To assess the association of measured gait speed with hemodialysis （HD） patients’ hospitalization, in conjunction with, and apart from, recent fall history.METHODS： Gait speed was measured by a standard prot...AIM： To assess the association of measured gait speed with hemodialysis （HD） patients’ hospitalization, in conjunction with, and apart from, recent fall history.METHODS： Gait speed was measured by a standard protocol and falls during the past 12 mo were ascertained for a prevalent multi-center HD cohort （n = 668） aged 20-92. Hospitalization during the past 12 mo was identified in the patient’s clinic records, and the first hospitalization after gait speed assessment （or the competing event of death） was identifed in the 2013 United States Renal Data System Standard Analysis Files.characterized 34.7% of the patients, and 27.1% had experienced a recent fall. Patients with slow gait speed but without a history of recent falls were 1.79 times more likely to have been hospitalized during the past 12 mo （OR = 1.79, 95%CI： 1.11-2.88, P = 0.02）, and patients with slow gait speed and a history of recent falls were over two times more likely to have been hospitalized （OR = 2.10, 95%CI： 1.19-3.73, P = 0.01）, compared with patients having faster gait speed and no recent fall history. Prospective examination of gait speed/fall history status in relation to frst hospitaliza-tion （or death） incurred by the end of follow-up Decem-ber 31, 2011 also showed that slow gait speed was as-sociated with these events in conjunction with a history of falls （HR = 1.54, 95%CI： 1.04-2.30, P = 0.03）.CONCLUSION： The International Task Force on Nutri-tion and Aging reported that gait speed is a powerful predictor for older adults of adverse outcomes such as hospitalization. In our data, gait speed-apart from, as well as in conjunction with, recent fall history-was as-sociated with HD patients’ hospitalization for multiple causes. Gait speed may be a sensitive health indicator among HD patients across the age spectrum.展开更多
Aiming at the control problem of strongly nonlinear and coupled permanent magnet synchronous motor(PMSM)oil rig,this paper presents a predictive control method based on dynamic matrix model.In this method,the dynamic ...Aiming at the control problem of strongly nonlinear and coupled permanent magnet synchronous motor(PMSM)oil rig,this paper presents a predictive control method based on dynamic matrix model.In this method,the dynamic matrix algorithm using multistep prediction technique is applied to the speed loop control of the motor vector control.And its control effect is compared with the traditional proportional integral(PI)control of the motor.By comparing the initial dynamic response and the steady-state recovery under load interference of the two methods,it is shown that the dynamic response and the robustness of the motor controlled by the new method is better than that controlled by conventional PI method.And the feasibility of new control in the application of PMSM oil rig is verified.展开更多
基金Supported by National Institutes of Health contract HHSN267200715004C,ADB No.N01-DK-7-5004(Dr.Kutner)
文摘AIM： To assess the association of measured gait speed with hemodialysis （HD） patients’ hospitalization, in conjunction with, and apart from, recent fall history.METHODS： Gait speed was measured by a standard protocol and falls during the past 12 mo were ascertained for a prevalent multi-center HD cohort （n = 668） aged 20-92. Hospitalization during the past 12 mo was identified in the patient’s clinic records, and the first hospitalization after gait speed assessment （or the competing event of death） was identifed in the 2013 United States Renal Data System Standard Analysis Files.characterized 34.7% of the patients, and 27.1% had experienced a recent fall. Patients with slow gait speed but without a history of recent falls were 1.79 times more likely to have been hospitalized during the past 12 mo （OR = 1.79, 95%CI： 1.11-2.88, P = 0.02）, and patients with slow gait speed and a history of recent falls were over two times more likely to have been hospitalized （OR = 2.10, 95%CI： 1.19-3.73, P = 0.01）, compared with patients having faster gait speed and no recent fall history. Prospective examination of gait speed/fall history status in relation to frst hospitaliza-tion （or death） incurred by the end of follow-up Decem-ber 31, 2011 also showed that slow gait speed was as-sociated with these events in conjunction with a history of falls （HR = 1.54, 95%CI： 1.04-2.30, P = 0.03）.CONCLUSION： The International Task Force on Nutri-tion and Aging reported that gait speed is a powerful predictor for older adults of adverse outcomes such as hospitalization. In our data, gait speed-apart from, as well as in conjunction with, recent fall history-was as-sociated with HD patients’ hospitalization for multiple causes. Gait speed may be a sensitive health indicator among HD patients across the age spectrum.
基金Open Fund Project of State Key Laboratory of Large Electric Transmission Systems and Equipment Technology(No.2012AA052903)
文摘Aiming at the control problem of strongly nonlinear and coupled permanent magnet synchronous motor(PMSM)oil rig,this paper presents a predictive control method based on dynamic matrix model.In this method,the dynamic matrix algorithm using multistep prediction technique is applied to the speed loop control of the motor vector control.And its control effect is compared with the traditional proportional integral(PI)control of the motor.By comparing the initial dynamic response and the steady-state recovery under load interference of the two methods,it is shown that the dynamic response and the robustness of the motor controlled by the new method is better than that controlled by conventional PI method.And the feasibility of new control in the application of PMSM oil rig is verified.
