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We introduce the concept of empirically sustainable principles for biosignal separation as a means of addressing the complexities that are practically encountered in the decomposition of surface electromyographic (sEMG) signals. Recently, we have identified two new principles of this type. The first principle places upper bounds on the inter-firing intervals and residual signal energies of the separated...
Patients in psychiatric hospitals that are sedated or secluded are at risk of death or injury if they are not continuously monitored. Some psychiatric patients are restless and aggressive, and hence the monitoring device should be robust and must transmit the data wirelessly. Two devices, a glove that measures oxygen saturation and a dorsally-mounted device that measures heart rate, skin temperature...
Whole-room indirect calorimeters are capable of measuring human metabolic rate in conditions representative of quasi-free-living state through measurement of oxygen consumption (VO2) and carbon dioxide production (VCO2). However, the relatively large room size required for patient comfort creates low signal-to-noise ratio for the VO2 and VCO2 signals. We proposed a wavelet-based approach to efficiently...
This work aims at testing the influence of the maximal oxygen uptake test and prolonged cycle ergometer exercise on sway density plot (SDP) parameters of postural control. Sixteen healthy male subjects were submitted to stabilometric tests with eye open and closed, before and after two different exercises. The maximal oxygen uptake test caused decrease of the mean duration of peaks in SDP, decreasing...
This study aims to explore whether human intentions to move or cease to move right and left hands can provide four spatiotemporal patterns in single-trial non-invasive EEG signals to achieve a two-dimensional cursor control. Subjects performed motor tasks by either physical movement or motor imagery. Spatial filtering, temporal filtering, feature selection and classification methods were explored...
A quantitative approach integrating AR modeling and wavelet transform is presented in this paper to analyze the digitized phonocardiogram. The recognition of the first and the second heart sounds (S1 and S2) were facilitated with wavelet transform without referring to the QRS waveform. We found that the Daubechies wavelet is most effective in identifying S1 and S2. In addition, the boundaries of S...
Estimation of the baroreflex gain has become an important tool in clinical practice in order to assess cardiac autonomic system control. Spectral analysis and sequence analysis techniques based on the spontaneous variability of systolic arterial pressure and heart period have been proposed to evaluate the baroreflex gain. These analyses can be significantly altered by the presence of nonstationarities...
This research presents contributions made in gear fault diagnostics for motion servos with continuously variable speed as used for aerospace and automotive electromechanical actuators. As the first step for motion servo diagnostics, an observer-based kinematic error estimator is developed whereby this estimated kinematic error is proposed as an operating point independent gear surface fault signature...
To solve the problems of bolt tightness degree detection in large structures, this paper studies the bolt tightness degree detection method in aluminum plate structure, by using piezoelectric sensor array to stimulate Lamb wave and HHT method to pick-up damage diagnostic parameter. The theory of HHT method is introduced, as well as the constitutions of the experimental system. Deal the echo signal...
Traditional ultrasonic testing system has fixed focus, which is burdensome for layer inspection of welds because different layer needs different steering angle and focus ultrasonic beam to inspect. Ultrasonic phased array testing instrument can electronically steer and focus the transmission ultrasonic beams. This ability makes it very advantageous in automatic nondestructive testing in industrial...
Through analyzing the situation of accelerometer testing system, there are several bottleneck factors such as various testing procedure, complicated operation, and easy to cause mishandling which have restricted the accelerometer's automatic testing capability. To calibrate the performance parameters better, the testing system for accelerometer based on GPIB is designed, and the composition of the...
In this paper it is shown that the effective number of bits (ENOB) of an analog-to-digital converter (ADC) can be accurately estimated by means of the three-parameter sine-fit algorithm, when the normalized frequency is a priori estimated by the interpolated discrete Fourier transform (IpDFT) method with maximum sidelobe decay windows. A criterion for optimal window choice is proposed. In addition,...
The structure of radix-2 Fast Fourier Transforms of length 2n where n is an integer is used to propose a new soft error detection and correction scheme for transform based convolution. The scheme can provide up to 100% detection and correction of isolated soft errors for, in many cases, approximately double the original system cost in terms of area and/or computational complexity. This is a substantial...
Due to the proliferation of technologies and services related with wireless sensor network, various sensor network applications are being appeared on the stage and a lot of sensor network testing technologies are being studied. However, most of testing systems or testbeds have objective for test and evaluation of sensor network protocols. For testing sensors and evaluating signal processing algorithms,...
As the design complexity increases dramatically, results of functional simulation are usually checked through only a part of signals during design verification. It is important, therefore, to consider the observability of internal signals for effective checking. This paper proposes a static observability analysis method to automatically select internal observation signals, which improves the quality...
A method for detecting or identifying odor outlier sample plays an essential role in implementing machine olfaction, called electronic nose (e-nose). The benefit of removing outlier not only eases the classification design process but also helps to improve the classification performance of the e-nose. In this study, odor-type signatures derived from the sensor array's response waveforms are employed...
Notice of Violation of IEEE Publication Principles"Evaluation of GP Model for Software Reliability,"by S. Paramasivam, and M. Kumaran,in the 2009 International Conference on Signal Processing Systems, May 2009After careful and considered review of the content and authorship of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE's Publication...
Most brain-computer interface applications in real-life suffer from the high rate of false activations. The ultimate goal when designing brain-computer interfaces is to reach the zero false activation rate while the true activation rate is kept at a high level. In this study, a brain-computer interface design is shown to have a zero false activation rate. The interface is based on different mental...
In this paper, a low-cost ADC output response analyzer (ORA) circuit for built-in self-test (BIST) application is proposed. The sine-wave histogram testing method and the basic coordinate rotation digital computer (CORDIC) technique are used to design the proposed ADC ORA circuit. The ADC's static and dynamic parameters can both be obtained using the proposed circuit. The basic CORDIC based ADC ORA...
In this paper we propose a nonparametric hypothesis test for stationarity based on local Fourier analysis. We employ a test statistic that measures the variation of time-localized estimates of the power spectral density of an observed random process. For the case of a white Gaussian noise process, we characterize the asymptotic distribution of this statistic under the null hypothesis of stationarity,...
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