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The ubiquity of mobile sensing devices in the Internet of Things (IoT) enables an emerging data crowdsourcing paradigm called participatory sensing, where multiple individuals collect data and use a cloud service to analyse the union of the collected data. An example of such collaborative analysis is collaborative anomaly detection. Given the possibility that the cloud service is honest but curious,...
Spectrum sensing data falsification (SSDF) attack are serious threats to collaborative spectrum sensing (CSS) of cognitive radio networks (CRNs). In this paper, inspired by EM (Expectation Maximization) method, we propose a scheme to estimate the presences of primary user (PU) and the SUs' operating point parameters (false alarm and detection probabilities) iteratively. The key features of the proposed...
This paper describes a current sharing technique for digitally controlled multiphase buck DC-DC converters. The effective duty cycle mismatches and resistance mismatches are digitally compensated to achieve equal current sharing without sensing currents. Effects of various non-idealities on the current sharing performance are discussed. Experimental results are shown for a four-phase synchronous buck...
It is very important to identify the electrical parameters accurately for the servo system of PM motor, that keep the fine torque response and the fine speed response. Generally, the electrical parameters of PM motor are identified by using the motor voltage and motor current. However, current sensor often has the offset value. In this case, the servo system of PM motor has the torque ripple and can...
Meshless methods popularized in recent years are attractive choices for solving discontinuous and large deformation problems. As one of the most popular methods to form trial function, moving least squares (MLS) can accurately fulfill input signal reconstruction of nonlinear multiple-input multiple-output sensor. However, the parameter matrix obtained from MLS approximation sometimes is ill-conditioned...
Induction motors are widely used in industry due to the fact that they are relatively cheap, rugged and maintenance free. As a consequence, much attention has been given to the motor torque and speed control. The control schemes available today require information regarding speed of the motor, which can either be obtained by using speed sensors or without speed sensors. Speed sensors have several...
The real time monitoring and control of resistance spot welds is a problem of critical importance in automotive and many other manufacturing industries. However, till this date, there are no reliable, low-cost, non-destructive techniques for predicting the size and strength of the weld nuggets in real time. This paper investigates the usage of voltage, current, and force data for the above tasks....
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