Dr. Gurmukh Singh
Senior Lecturer Gurmukh Singh of the Department of Computer and Information Sciences reports he had the honor during the Fall 2021 semester of evaluating a Doctor of Philosophy dissertation that a graduate student completed with a faculty member from the Sciences and Technology Department at Pune University, Pune, India.
Dr. Singh was selected from a panel of three foreign examiners to act as an external foreign examiner of the Ph.D. thesis, “Investigation of acoustics transducer response and efficiency characteristics to designate handles for augmenting designs, and testing techniques.”
He explained that the Ph.D. work involved the calibration of a number of microphones using the T-type chamber to assess the design, implementation and performance of this pressure-independent technique. The features of the versatile technique that eliminate the limitations of a conventional coupler are discussed in the thesis work. Furthermore, he added, the frequency response characteristics of a variety of microphones is compared.
Dr. Singh continued, adding, a detailed description of the procedure is presented along with checks in which the results are tested over the Type-A and Type-B uncertainties associated with different varieties of microphones. Parameters like diaphragm stiffness, transformation factor and moving mass of voice coil are optimized in pairs to enhance the efficiency.
These functions are based on the following characteristic responses: variation of efficiency with transformation factor at varying diaphragm stiffness and constant moving mass, and variation of efficiency with moving mass at varying diaphragm stiffness and constant transformation factor. Typical audience seating arrangements in rooms and auditoriums too warrant reinvestigation of the direct radiator speaker response in the near-direct and far-reverberant fields, as the response data provided by the manufacturer is always ideal and does not account for the effect of those fields.
Speaker response characteristics of a variety of direct radiator loudspeakers ranging from the conventional squawker to the full range radiator have been investigated in these fields. The response is determined by measuring the A-weighted SPL in the near-direct and far-reverberant fields. The field-specific characteristic for each of the radiators is determined by fitting the sound pressure level (SPL) data obtained to the appropriate polynomials. The coefficients obtained thereby allow an objective field-specific comparison amongst radiators. The outcome of this work assists one to configure the best radiator ensemble for a given enclosure, despite placement constraints.
In the fall semester, Singh also designed a lab book, “Intro to Information Systems,” especially for SUNY Fredonia undergraduate students who are majoring in Information Systems as well as for the Business and Accounting majors/minors. The lab book is published by the Pearson Collections, Copyright@2021 by Pearson Learning Solutions.
The lab book contains 10 labs that are based on the two latest version of MS Software, MS Excel 365 and MS Access 365, and is adopted for the first time by all the instructors teaching CSIT 151: Intro to Information Systems in the Department of Computer and Information Sciences. The same lab book will be adopted in the Spring 2022 and Fall 2022 semesters.
