Wyniki wyszukiwania - BazTech

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Towards an analytical model for characterising behaviour of high-speed VVoIP applications

Sukhov A., Calyam P., Daly W., Ilin A.

Computational Methods in Science and Technology

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2005

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Vol. 11, nr 2

161-167

EN

The use of high-speed multimedia technologies such as MPEG-based interactive Videoconferencing and IPTV for delivering Television content over the Internet is becoming increasingly common. With commercial vendors and content providers envisioning products and services for delivering audiovisual content equipped with greater user-control and higher resolutions, there has arisen a significant demand to identify and quantify various bottlenecks in the Internet to better support such ventures. In this paper, we attempt to develop an analytical model that reflects the effects of various device factors and network factors that affect the performance of highspeed interactive audiovisual streams, i.e. the ultimate end-user perception of audiovisual quality. To develop our model, we use a set of experimental results obtained in both a LAN as well as on an Internet testbed.

2

On numerical calculation of acoustic field of plane source

Leble S., Sukhov A.

TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk

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2003

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Vol. 7, No 2

185-198

EN

The harmonics of an acoustic beam have been evaluated numerically by means of an integral representation according to the perturbation theory. A method for evaluation of the integrals of a rapidly oscillating function has been applied. Special attention has been paid to the accuracy of calculations and an algorithm for error estimation has been proposed. A computer program has been realized, and the profiles of the first and the second harmonics have been plotted. The used methods can be applied for the problem with dissipation or dispersion.

3

Model equation for the sound beam in inhomogeneous liquid

Perelomova A., Sukhov A.

Hydroacoustics

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1999

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Vol. 2

257--262

EN

A beam propagation at inhomogeneous medium is treated in parabolic approximation. For a liquid with gas bubbles a model equation which combine Khokhlov-Zabolotskaya equation with a weak dispersion was derived. Equation with new coefficients which are revised for compressible liquid is obtained. That is essential for dynamics of bubbly liquid with small volume concentrations of bubbles. A physical realistic ranges of parameters in which the derived equation is valid are specified.