Tikhonov regularization of linear discrete ill-posed problems often is applied with a finite difference regularization operator that approximates a low-order derivative. These operators generally are represented by banded rectangular matrices with fewer rows than columns. They therefore cannot be applied in iterative methods that are based on the Arnoldi process, which requires the regularizati...

This work introduces a volume rendering technique that is conceptually based on the shear-warp factorization. We propose to perform the shear transformation entirely in the frequency domain. Unlike the standard shear-warp algorithm, we allow for arbitrary sampling distances along the viewing rays, independent of the view direction. The accurate scaling of the volume slices is achieved by using ...

This report deals with the application of non-negative matrix factorization (NMF) in speech processing. A Bayesian NMF is used to find the optimal number of basis vectors for the speech signal. The result is validated by performing a speech enhancement task for a set of different number of basis vectors. The algorithm performance is measured with the Source to Distortion Ratio (SDR) that repres...

Cloud computing is an emerging technology where all the computing resources are shared on the cloud rather than having local servers or personal devices to handle applications. Encrypting data residing on the cloud database is required to prevent unauthorized access of confidential and critical information and the subsequent modification of the information for personal benefit. As all the organ...

One key problem in subband and wavelet coding systems, is the decomposition of limited size signals. The Wavelet transform is defined for infinitelength signals. In practice we only have finite-length signals, so signals must be extended before they can be transformed. The question is how to extend the signal to minimize signal end effects, or how to find the signal extension that preserves the...

The National Institute for Occupational Safety and Health (NIOSH) researchers have investigated seat design issues for the occupants and operators of underground mine transport vehicles relative to wholebody vibration (WBV) and mechanical shock. Considering the ergonomic and engineering improvements made to underground mine shuttle car seats, this study has focused on reducing injury risk by im...

The iterative Fourier transform algorithm (IFTA) is widely used in various optical communication applications based on liquid crystal silicon spatial light modulators. However, the traditional method has many disadvantages, such as a poor effect, an inability to select optimization direction, and failure consider zero padding or phase quantization. Moreover, after years of development, emergenc...

This paper considers systems for Traffic Analysis Prevention (TAP) in a theoretical model. It considers TAP based on padding and rerouting of messages and describes the effects each has on the difference between the actual and the observed traffic matrix (TM). The paper introduces an entropy-based approach to the amount of uncertainty a global passive adversary has in determining the actual TM,...