ii I hereby declare that I am the sole author of this thesis. I authorize the University of Manitoba to lend this thesis to other institutions or individuals for the purpose of scholarly research. I further authorize the University of Manitoba to reproduce this thesis by photocopying or other means, in whole or in part, at the request of other institutions or individuals for the purpose of scho...

Four experiments studied the opioid receptor subtype and signal transduction mechanisms mediating fear extinction in the ventrolateral quadrant of the midbrain periaqueductal gray (vlPAG). Microinjection of a mu- but not a delta- or kappa-opioid receptor antagonist into the vlPAG retarded extinction. Extinction was also dose-dependently retarded by vlPAG infusions of a cyclic AMP (cAMP) analog ...

A Parallel multiplier using approximate compressors are proposed in this paper. The two new approximate 4-2 compressors are proposes that the simplified compressors have better power consumption than the optimized 4-2 compressor existing designs. These approximate compressors are then used in the restoration module of a Parallel multiplier. Four different schemes for utilizing the proposed appr...

OBJECTIVE Verify whether PDD reflects vocal changes obtained by vocal rehabilitation and whether it reflects the changes in perceptual analysis. METHODS Samples of the sustained vowel / ε /, pre and post-therapy, from 34 individuals with different dysphonia diagnosis were collected. The voices were acoustically analyzed by the PDD and an auditory perceptual analysis was performed using a visu...

In almost all of the currently working circuits, especially in analog circuits implementing signal processing applications, basic arithmetic operations such as multiplication, addition, subtraction and division are performed on values which are represented by voltages or currents. However, in this paper, we propose a new and simple method for performing analog arithmetic operations which in thi...

Combination of A/D-D/A converters allows implementing multiplier/divider operations. An efficient design based on continuous-time, current-mode, dividing-algorithmic converters is presented in this paper. It offers high speed and capability of low voltage operation, and it is suitable for applications of low or middle resolution (below 9 bits). In addition, the division result is given in both ...