3 results match your criteria: "University ofSouthern California[Affiliation]"
Multimodal physical activity recognition by fusing temporal and cepstral information.
IEEE Trans Neural Syst Rehabil Eng
August 2010
Viterbi School of Engineering, University ofSouthern California, Los Angeles, CA 90089, USA.
A physical activity (PA) recognition algorithm for a wearable wireless sensor network using both ambulatory electrocardiogram (ECG) and accelerometer signals is proposed. First, in the time domain, the cardiac activity mean and the motion artifact noise of the ECG signal are modeled by a Hermite polynomial expansion and principal component analysis, respectively. A set of time domain accelerometer features is also extracted.
View Article and Find Full Text PDFAn implementation of CalderOn's method for 3-D limited-view EIT.
IEEE Trans Med Imaging
July 2009
Information Sciences Institute, University ofSouthern California, Arlington, VA, USA.
Article Synopsis
- Calderón's foundational paper set the stage for electrical impedance tomography (EIT) by proposing the use of external voltage patterns for reconstructing a medium's admittivity through inverse Fourier transforms.
- We have developed a new algorithm that adapts Calderón's method to work with measurements taken from a part of the boundary and discrete electrodes, optimizing voltage or current patterns for better approximation.
- By leveraging the redundancy in our three-dimensional measurements, we enhance the quality of the static images produced by our algorithm, improving the EIT outcomes.
Analysis of Resolution and Noise Properties of Nonquadratically Regularized Image Reconstruction Methods for PET.
IEEE Trans Med Imaging
March 2008
Signal and Image Processing Institute, University ofSouthern California, Los Angeles, CA 90089, USA.
We present accurate and efficient methods for estimating the spatial resolution and noise properties of nonquadratically regularized image reconstruction for positron emission tomography (PET). It is well known that quadratic regularization tends to over-smooth sharp edges. Many types of edge-preserving nonquadratic penalties have been proposed to overcome this problem.
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