Ukraine Archives - Standards Michigan

Security and Resilience

Study on the Relationship Between Speech Intelligibility and Quality Estimates in University Classrooms

Arkadiy Prodeus, et al

Department of Acoustic and Multimedia Electronic Systems, National Technical University of Ukraine

Abstract: In this paper, correlation coefficients between the five objective estimates of speech quality, on the one hand, and the Speech Transmission Index as speech intelligibility measure, on the other hand, were estimated. This comparison was performed using binaural room impulse responses corresponded to different points of the three university auditoriums of different sizes. Speech quality was assessed using intrusive speech quality measures: Segmental Signal-to-Noise Ratio, Logarithmic Spectral Distortion, Frequency-Weighted Segmental Signal-to-Noise Ratio, Bark Spectral Distortion, and Perceptual Evaluation of Speech Quality. The formation of signals distorted by reverberation was performed by convolving of pure signals with binaural room impulse responses of the premises. A high level of correlation (0.6-0.99) of Bark Spectral Distortion estimates with estimates of the Speech Transmission Index for rooms of different sizes was revealed. Correlation of estimates (0.65-0.98) of Frequency-Weighted Segmental Signal-to-Noise ratio with Speech Transmission Index estimates was observed for medium and large rooms. Significant correlation (0.96-0.99) of Perceptual Evaluation of Speech Quality with Speech Transmission Index estimates was observed only for large audiences. At the same time, estimates of the Segmental Signal-to-Noise Ratio and Logarithmic Spectral Distortion turned out to be practically uncorrelated with Speech Transmission Index estimates for all studied premises.

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Project Financing Solutions in Construction

Modern Structuring of Project Financing Solutions in Construction

Galyna Ryzhakova, et al

Department of Management in Construction, Kyiv National University of Construction and Architecture

Abstract: The article substantiates the expediency of choosing a properly formalized assessment of both the credit rating and the volume and structure of the issuer’s obligations to finance buildings and structures as objects of investment, which objectively takes into account the interests of investment participants. Traditional models of evaluating the effectiveness of investment projects based on the concept of discounting are studied. Methods of assessment of economic entities are presented, which consist of the validity of financial and economic activities in certain areas, such as liquidity, profitability, financial stability, asset turnover and others that need to improve housing conditions, overcome the global financial crisis, preserve production potential housing construction, creating conditions for its effective operation and improving existing market mechanisms for investing in housing construction.

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Coffee with the Rector

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