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1

Quantifying the Suitability of Reference Signals for the Video Streaming Analysis for IPTV

Hoppe C., Manzke R., Rompf M., Uhl T.

Journal of Telecommunications and Information Technology

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2016

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nr 1

29--36

EN

IP networks are indispensable nowadays and they are some of the most efficient platforms. The constantly growing number of users and new services in these networks – the largest being the Internet – require a satisfactory quality of service from any application they use. So, determining the QoS in real-time services is particularly important. This work shows how to quantify the suitability of reference signals for analyzing the quality of video streaming in IPTV. The assessment relies on two different algorithms: PEVQ and VQuad-HD. Three different reference signals – two real ones and an artificial one – are used in this study, and a numerical measurement system is used, which simulates mean network impairments. These measurements provide valuable information for determining the QoS of actual IPTV services in practice.

2

Inżynieria odwrotna w okrętownictwie

Kozak J.

Mechanik

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2015

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R. 88, nr 10CD

102--111

PL

W procesie budowy i eksploatacji dużych obiektów inżynierskich często zachodzi potrzeba inwentaryzacji i odtworzenia stanu rzeczywistego kształtu czy też położenia elementów konstrukcji. Powody takiej potrzeby wynikają najczęściej z braku albo nieaktualności dokumentacji w procesie wytwarzania, a jeszcze częściej przebudowy czy modernizacji. Coraz częściej potrzeby takie pojawiają się w okrętownictwie. Proces tworzenia – niejako – od nowa dokumentacji obiektu rzeczywistego jest nazywany „inżynierią odwrotną” i rozwija się obecnie intensywnie z racji pojawienia się szeregu nowych urządzeń do bezdotykowego pozyskiwania danych z rzeczywistych obiektów konstrukcyjnych, a następnie ich przetwarzania. W artykule przedstawiono ideę, instrumenty i przykłady realizacji procesów z obszaru inżynierii odwrotnej w okrętownictwie.

EN

During the process of manufacturing or exploitation time o floating object, very often necessity of inventory control for recovery of technical documentation of real shape or installation’s scheme took place. Such needs is caused because of lack or out to date documentation of object, especially during the process of refitting or modernization. Such process of creation - from none – of the documentation of existing object is called “reverse engineering” and is widely developed nowadays because of new generations of non-touching measurements instruments as well as programs for such data acquired processing. In the paper the idea, instrumentation and case studies of reverse engineering in shipbuilding industry are presented.

3

New Tool for Investigating QoS in the WWW Service

Uhl T., Rompf M.

Journal of Telecommunications and Information Technology

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2015

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nr 1

3--9

EN

The subject of this paper is the QoS measurement in the World Wide Web (WWW) service. It will begin with a brief presentation of methods currently used to measure QoS in the WWW service before going on to describe in detail the new tool QoSCalc (WWW). Following that, the potential of the new tool will be put to the test in a series of analysis scenarios. The results and insights obtained will then be presented in several diagrams, and interpreted.

4

Control measurement sources in large-lot production of pistons

Kosicki A., Lisiak P., Streubel A.

Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika

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2002

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z. 58 [193]

197-205

EN

Technological problems, design solution of pistons, measurement tools and devices used in the production process of the piston are presented in this paper.

5

New possibilities of electromagnetic logging in anisotropic and heterogeneous rock medium

Gawin A., Gawin H.

Acta Geophysica Polonica

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2000

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Vol. 48, nr 4

489-521

EN

This paper, being a continuation of the earlier works by the author, presents new possibilities of electromagnetic logging in anisotropic and heterogeneous rocks. The theoretical background for (among other things) the azimuth-radial electromagnetic logging with wave and geometrical shaping - of the field is described. It is assumed that the medium at the outside of boreholes - the zone contaminated by mud filtrate and uninvated zone - is heterogeneous and anisotropic. In general, we treat the specific conductivity tensor s, the electric permittivity tensor e, and the magnetic permeability tensor m, as functions C1 of the point. An influence of anisotropy of electric properties is much simpler. In the case of monochromatic fields, a uniform wave tensor can be employed. An assumption that also magnetic permeability is a tensor helps us to introduce a uniform tensor according to the classical theory. These difficulties are avoided, at last in the formal operation with equations, if the approach to the problem is relativistic.