Recent medical industry has been developed from therapy-centered medicals to health advance and anti-aging materials. In the t-Healthcare industry through these active developments, engineers are focused on investigations about monitoring of patient states and various bio-signals for such objective. One of general examples is that the arterial blood volume of general bio-signals is observed by using the photoplethysmogram (PPG) monitoring systems. This paper presents an novel equipment with low power, high degree of precision, and miniaturization by Programmable System-on-Chip (PSoC) technique which includes both analog circuits and microprocessor functions, in order to measure such PPG signal..
AFC (Adaptive Feedforward Control) is significantly employed for improving control performance of dynamic systems particularly involving periodic disturbance signals in engineering fields. This paper presents a novel hybrid AFC approach for discrete-time systems with multiple disturbances in terms of control input and state variables. The proposed AFC mechanism is hierarchically composed of a conventional feedforward control framework and PID auxiliary control configuration in parallel. The former is generic to decrease periodic disturbance excited to control actuators and the latter is additionally constructed to overcome control deterioration due to time-varying uncertainty under given systems. We carry out numerical simulation to test reliability of our proposed hybrid AFC system and compare its control performance to a well-known conventional AFC method with respect to time and frequency domains for proving of its superiority.
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