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A diagnostic ultrasound (US) system transmits acoustic waves at several to tens of MHz into the human body for clinical purposes and detects the reflected waves to observe the internal organs without having a medical operation or radiation exposure. The system is composed of a main unit and probe connected via coaxial cables. The probe is very small because medical technicians laboriously grab and...
Ultrasound computed tomography (USCT) is a promising candidate for a radiation-free, painless, and quantitative modality for breast cancer examination. However, microcalcifications, which are one of the most important indicators of breast cancer in mammography examination, are difficult to detect by either USCT or conventional echography. In this study, we propose a new method for extracting point...
A reliable wireless communication method for next-generation decentralized control of power distribution systems is described; the method is based on TDMA combined with broadcast and data redundancy. The communication reliability (packet non-arriving rate [PNR] and latency) of the method was evaluated for a case study in a simulation under a realistic condition using Japanese next-generation power...
An insulated signal transmission system using planar resonant coupling technology has been developed for providing driving signal transmission to control power electronic equipment. The resonant coupling can reduce the unwanted leakage that prevents conventional wireless systems from being applied inside the equipment. Using planar resonant couplers, the system restricted propagation loss to −0.9...
A wireless wake-up receiver for lithium-ion battery systems was developed and evaluated. A 2-stage power-supply control scheme is added to the wake-up receiver for supporting low power, high receiving sensitivity, and short wake-up time simultaneously. When the battery system is in power-down mode, only a voltage detector in the wake-up receiver consumes a current while waiting for a wireless wake-up...
A rotating shaft in a wheel, a motor and a turbine uses sensors to measure torque, vibration, and acceleration for better control and maintenance of a machine. Such data is currently acquired in a laboratory and utilized for tuning the machine. For adaptive control and failure prognosis in future, the data need to be collected by the sensors on the fly. Connecting the moving sensors by wire and a...
An arbitrary power and positioning two-dimensional (2D) wireless power transmission system is proposed and evaluated. A transmitter outputs the power to an arbitrary position on a 2D waveguide sheet by using multiple output ports. The output power and phase of each port is tunable. Power amplifier (PA) efficiency was improved from 19% to 46% when the output power was 10 dB smaller than peak power...
A small plane coupler integrating a receiving circuit is proposed and developed for wireless power transmission. A small and lightweight coupler has been required to enable a continuous wireless power in transmission systems for mobile devices. This coupler has two elements coupled with a two-dimensional waveguide sheet, and the coupling capacitances between the elements and the sheet reduce the coupler...
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