Thesis (M. Communication Pathology)--University of Pretoria, 2004. / Includes bibliographical references.

A dissertation submitted to the Faculty of Engineering and the Built Environment, University of the Witwatersrand, Johannesburg, in ful lment of the requirements for the degree of Master of Science in Engineering, Johannesburg, September 2019 / The objective of this research was to develop an integrated Port Hamiltonian model of the human outer, middle and inner ear. The developed Port Hamiltonian model of the human ear is based on the Dirac structure. The outer, middle and inner ear are developed in segments, tested and validated prior to the system being coupled. The outer, middle and inner ear are validated against existing literature and the results are found to be comparable. The application of the developed Port Hamiltonian model is illustrated using a developed feedback based noise policy management model for mine workers. This feedback based measurement system can be used to monitor mine workers in the mines hence provide the mine administrators with the current state of hearing of the individual worker. The information obtained from the system may be used by the administration to provide an early intervention and as a result the mine workers are protected from experiencing signi cant hearing threshold shifts. A control engineering approach is then used to formulate the mining noise occupational policies as a control law. Both social and measurements aspects of this system are explored. The International Standard Organization guide ISO:1999 is used to generate data and develop a basic feedback model. The basic feedback model is further re ned into a dynamic model which includes a Port Hamiltonian integrated ear model and the mining policies. The feedback based noise policy management model is validated using real data from the mine documented in open source literature. The models are implemented using MATLAB as a modelling platform and the results are generated using the Simulink model. This research work has been given an ethical clearance certi cate by the Human Research Ethics Committee (Medical), therefore, allowing for the ndings of the investigations to be published. In conclusion,to be developed is an integrated Port Hamiltonian model of the Human outer, middle and inner ear to be used for estimation of Noise induced hearing loss. The use of this model is then illustrated using a feedback based noise policy monitoring system for mine workers. / PH2020

published_or_final_version / Environmental Management / Master / Master of Science in Environmental Management

published_or_final_version / Speech and Hearing Sciences / Master / Master of Science in Audiology

Thesis (M. Sc.)--University of Hong Kong, 2002. / Includes bibliographical references (leaves 85-89).

Thesis (M. Sc.) -- University College London, 1998. / A project submitted (to the Institute of Laryngology and Otology) as a requirement for the degree of Master of Science in Audiological Medicine, University College London. Bibliography: leaves 83-101.

Thesis (M. Sc.)--University of Hong Kong, 2000. / Includes bibliographical references (leaves 32-36).

Thesis (M. Sc.)--University of Hong Kong, 2000. / Includes bibliographical references (leaves 65-73).

Thesis (M.Communication Pathology)--Universiteit van Pretoria, 2002. / Summary in English and Afrikaans. Includes bibliographical references.

Thesis (M. Communication Pathology)--University of Pretoria, 2005. / Includes bibliographical references.