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Human activity recognition based on smart phones has been widely used in many fields including the mobile context awareness and inertial positioning. Compared to the activity recognition whose sensor location is fixed, the activity recognition based on smartphones has a new problem because the mobile direction and position are not fixed. In this paper, we study the activity recognition on the Android...
This paper studies and proposes a harmonic-optimized control strategy for the paralleled voltage source inverters (VSI) fed permanent magnet synchronous motor (PMSM) drive. The system configuration and equivalent model of the paralleled VSIs fed PMSM drive are developed and analyzed. The mathematical analysis reveals the principle and performance of the carrier phase-shifted space vector pulse width...
Motor current signature analysis based on Fast Fourier Transform (FFT) has been successfully used in a permanent magnet synchronous motor (PMSM) drive system for fault diagnosis. However, the method does not always achieve good results according to two aspects. Firstly, the amplitudes of fault harmonic components are quiet small compared with the fundamental amplitude if the fault severity is small...
Energy efficiency is becoming increasingly important for mobile devices because battery technology has not kept up with the growing demand of ubiquitous multimedia communications. Since multi-user multiple-input multiple-output (MU-MIMO) is a key technology in next-generation wireless communications, this paper addresses optimal energy-efficient design for MU-MIMO. The energy efficiency is measured...
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