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Nighttime blood pressure (BP) is found to best predict the 5-year risk of cardiovascular death in comparison to daytime BP, BP measured over a 24-hour period and clinical BP. In view of this, a novel contactless system has been developed on a sleeping bed for the cuffless and continuous estimation of BP at night. Experiments were conducted on 11 subjects to evaluate the contactless system, particularly...
This paper reports a novel contactless monitoring method to record reflective mode photoplethysmogram (PPG) on a sleeping bed for heart rate (HR) estimation. The electrocardiogram (ECG) and pulse transit time (PTT) were also measured in this study. ECG was measured from subjects' limbs whilst PPG was obtained from their right index fingers and their backs with and without direct contact between the...
In this paper, a body sensor network (BSN) system for measuring systolic blood pressure (SBP) by a cuffless approach based on h-Shirt has been developed. Two experiments were conducted on a total of 22 subjects to evaluate the cuffless calibration approach and BSN system respectively. The results showed that using the estimated time and distance travelled by a pulse and a parameter derived from the...
This paper proposes a new calibration parameter from the dicrotic notch of photoplethysmography (PPG) waveform for systolic blood pressure (SBP) estimation using pulse transit time (PTT). An experiment including exercise was conducted on twelve subjects. The results show that estimation with PTT and a new parameter, i.e. the Relative Amplitude of Secondary peak (RAS), can predict SBP within 1.7 plusmn...
A three-phase, electrochemical and thermal coupled model is developed for valve-regulated lead-acid (VRLA) batteries. Physical phenomena important to the VRLA battery overcharge process, such as gas generation, transport, and recombination, electrolyte displacement and capillary flow, and the venting event during discharge/rest/charge, are incorporated in the model. The effects of important parameters,...
A combined numerical and experimental study of the discharge and charge of nickel-metal hydride (Ni-MH) batteries has been performed. Numerical simulations were based on a previously developed micro-macroscopic coupled model which includes both the proton diffusion in the nickel active material and the hydrogen diffusion in metal-hydride particles. Oxygen generation and recombination, a principal...
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