..................................................................................................... viii Chapter One: Introduction.............................................................................. 1 1.

This paper presents the developmental fundamental frequency (F0) data from Cantonesespeaking pre-adolescent children, male and female. Results of frequency analysis of the speech data from children of nine age groups from 4 to 12 years show that (i) there is an overall drop in F0 across the nine age groups of both genders and a larger change for male than female children; (ii) a significant dif...

Given a unitary operator A representing a physical quantity of interest, we employ concepts from group representation theory to deene two natural signal energy densities for A. The rst is invariant to A and proves useful when the eeect of A is to be ignored; the second is covariant to A and measures the \A" content of signals. The construction is quite general and is also easily extended to the...

Using plant database we investigate the distribution of different tuples of small length for TATA and TATA-less promoters. Results show that in the neighborhood of TATA patterns some of the tuples demonstrate discriminating distribution for TATA and TATA-less promoters. Based on this observation we perform probabilistic learning to recognize TATA promoters and are able to reduce the false posit...

| Given a unitary operator A representing a physical quantity of interest, we employ concepts from group representation theory to deene two natural signal energy densities for A. The rst is invariant to A and proves useful when the eeect of A is to be ignored; the second is covariant to A and measures the \A" content of signals. We also consider joint densities for multiple operators. In the pr...

In the article methods of vibroacoustic diagnostics of high-power toothed gears are described. It is shown below, that properly registered and processed acoustic signal or vibration signal may serve as an explicitly interpreted source of diagnostic symptoms. The presented analysis were based on vibration signals registered during the work of the gear of a rolling stand working in Katowice Steel...

background and aim: it has been several decades since the technology of frequency lowering (fl) has been proposed. however, primary research has revealed no benefits regarding the use of this technique. currently, new methods for fl and improvement of perception of speech and fricative sounds have led to the application of these methods by numerous companies to produce hearing aids. in this stu...

in the present paper, the aeroelastic stability of helicopter rotor blade is determined using aeroelastic frequency response function. the aeroelastic model of blade is obtained by combining dowell - hodges beam model with loewy unsteady aerodynamic theory which considers an unsteady wake beneath the rotor. equations are formed and aeroelastic frequency response functions are obtained by invert...

Analysis of linear time-varying (LTV) systems is closely related to time-varying spectral analysis of nonstationary processes. In this paper, we link together the classical theory of linear time-varying systems and wellknown concepts from time-varying spectral analysis. Formulation of the generalized Weyl correspondence provides a unified time-frequency (TF) framework for linear system analysis...