A fast-Fourier-transform method of topography and interferometry is proposed. By computer processing of a noncontour type of fringe pattern, automatic discrimination is achieved between elevation and depression of the object or wave-front form, which has not been possible by the fringe-contour-generation techniques. The method has advantages over moire topography and conventional fringe-contour interferometry in both accuracy and sensitivity. Unlike fringe-scanning techniques, the method is easy to apply because it uses no moving components.

Fourier-transform method of fringe-pattern analysis for computer-based topography and interferometry

Digital processing of speech signals

Computer and Robot Vision Vol. 1, by R.M. Haralick and Linda G. Shapiro, Addison-Wesley, 1992, ISBN 0-201-10887-1.

Computer and Robot Vision

Applied Numerical Analysis. By C.F. Gerald. Pp. xii, 340. £3·60. 1970. (Addison-Wesley.)

An electrosurgical generator has an output power control system that causes the impedance of tissue to rise and fall in a cyclic pattern until the tissue is desiccated. The advantage of the power control system is that thermal spread and charring are reduced. In addition, the power control system offers improved performance for electrosurgical vessel sealing and tissue welding. The output power is applied cyclically by a control system with tissue impedance feedback. The impedance of the tissue follows the cyclic pattern of the output power several times, depending on the state of the tissue, until the tissue becomes fully desiccated. High power is applied to cause the tissue to reach a high impedance, and then the power is reduced to allow the impedance to fall. Thermal energy is allowed to dissipate during the low power cycle. The control system is adaptive to tissue in the sense that output power is modulated in response to the impedance of the tissue.

Electrosurgical generator with adaptive power control

This paper studies the blind separation of signal sources (BSS) based on the approach of de-cumulant. It considers the cases where independent signal sources are mixed through convolutive mixing system with unity autochannel frequency responses and causal cross-channel FIR filters. Firstly, it tries to show that the de-cumulant is sufficient for separation. Secondly, novel algorithms are developed based on zero-forcing of cross-cumulant pairs. These algorithms are developed in the time-domain and so there is not the frequency permutation ambiguity problem usually suffered by most of the frequency-domain algorithms. Simulation results are presented to support the validity of the proposed algorithms.

/pdf/de-cumulant-based-approaches-for-convolutive-blind-source-1bwun1liis.pdf

De-cumulant based approaches for convolutive blind source separation

This session at the Australian Software Engineering Conference is concerned with ICT education from the holistic perspective of preparation in high schools, the university experience, transition to the workforce, and the contribution by industry, government, and professional bodies. The project to ascertain the issues and challenges facing the national ICT education sector is supported by the Carrick Institute as a Discipline-Based Initiative. Consultations to date with various stakeholders have revealed numerous concerns that include: the dispersed nature of the ICT sector; erroneous perceptions of ICT disciplines; decline in enrolments; gender imbalance; lack of industry involvement; and balancing knowledge with generic skills acquisition. This forum will involve the project team and invited participants to report on findings from consultations and research. Attendees will be invited to respond and to contribute their issues and challenges that are of particular concern to the software engineering community.

http://ieeexplore.ieee.org/iel5/4483171/4483172/04483250.pdf

Special Session: Issues in Australian ICT Education

We present a theoretical analysis on the locations of transition points in moderate feedback self-mixing signal which is a fundamental issue to be addressed in preprocessing experimentally acquired data. Locations for the start and end points for upward and downward switchings are calculated based on the Lang-Kobayashi model and discussions are given, which provides guidance in achieving more accurate signal normalization.

/pdf/transition-analysis-for-moderate-feedback-self-mixing-48w6mg2d8y.pdf

Transition analysis for moderate feedback self-mixing interferometry

A new approach for the blind separation of convolutive mixtures is proposed based on sources nonstationarity and the joint diagonalization of the output power spectral density matrices. It utilizes a time-domain separation network, but the coefficients are optimized based on a frequency domain objective function. The proposed algorithm has the advantages associated with frequency domain BSS algorithms for long mixing channels, but does not suffer from permutation ambiguity problem.

Joe F. Chicharo

Papers

De-cumulant based approaches for convolutive blind source separation

Special Session: Issues in Australian ICT Education

Transition analysis for moderate feedback self-mixing interferometry

Joint diagonalization of power spectral density matrices for blind source separation of convolutive mixtures

Joint diagonalization of power spectral density matrices for blind source separation of convolutive mixtures