Autor: Rachwalski, J. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Burst Ratio in Concatenated Markov-based Channels
Autorzy:: Rachwalski, J.
Papir, Z.
Powiązania:: https://bibliotekanauki.pl/articles/307592.pdf
Data publikacji:: 2014
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: burst ratio
bursty packet loss
E-Model
quality of service
voice over IP
Opis:: This paper deals with the burst ratio parameter, which describes the burstiness of a packet loss observed in digital networks. It is one of the input parameters of E-model – the most widely used method of assessing conversational quality of telephony. The burst ratio is defined for one channel scenario so it can be calculated when the whole transmission path has been characterized by a single set of parameters. The main objective of the paper is to extend the burst ratio definition when the transmission path is defined as a tandem concatenation of transmission channels being described by their individual burst ratios. It is assumed that packet loss of a single channel is described by a 2-state Markov chain. The final result of the research is an equation describing the burst ratio parameter when the transmission path consists of multiple concatenated channels. The derived formula has been validated by extensive simulations.
Źródło:: Journal of Telecommunications and Information Technology; 2014, 1; 3-9
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Analysis of Burst Ratio in Concatenated Channels
Autorzy:: Rachwalski, J.
Papier, Z.
Powiązania:: https://bibliotekanauki.pl/articles/309539.pdf
Data publikacji:: 2015
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: bursty packet loss
E-model
quality of experience
voice over IP
Opis:: Burst ratio is a parameter that quanties packet loss patterns in transmission networks. It has been dened for an end-to-end scenario, therefore burst ratio can be determined only if the characteristics of the whole transmission path are known. In this paper, the burst ratio parameter applicability to cases when the transmission path consists of a series of transmission channels with known packet loss rate and burst ratio values is extended. The paper also presents the results of simulations performed with NS2 software, demonstrating the validity of the burst ratio analysis. Consequently, the research makes it possible to determine the value of the burst ratio parameter in concatenated packet networks, which in turn supports delivering higher quality VoIP services.
Źródło:: Journal of Telecommunications and Information Technology; 2015, 4; 65-73
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Numerical investigation of the secondary flow development in turbine cascade
Autorzy:: Doerffer, P.
Rachwalski, J.
Magagnato, F.
Powiązania:: https://bibliotekanauki.pl/articles/1955810.pdf
Data publikacji:: 2001
Wydawca:: Politechnika Gdańska
Tematy:: turbines
computational fluid dynamics CFD
secondary flow
wind turbines
Opis:: The results represent the first attempt of the numerical analysis of 3-D secondary flows formed in the linear turbine cascade wind tunnel. Numerical simulations were carried out by means of the SPRC code. It was possible to make presented here calculations thanks to the cluster of PC's providing sufficient computational resources. In order to be able to verify the obtained results the case considered is the workshop test case (D.G.Gregory-Smith 1994 Turbomachinery Workshop Test Case No.3 116). It has been shown that the obtained results are in a very good agreement with experiment. It gave confidence in the results and several important conclusions concerning the development of streamwise vortices could be made thanks to the work carried out.
Źródło:: TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2001, 5, 2; 165-178
1428-6394
Pojawia się w:: TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Analiza mocy kończyn dolnych i różnych typów reakcji u zawodników hokeja na trawie na wysokim poziomie zaawansowania sportowego
The analyze of the power of legs and various types of reaction among the hockey field players at the highest level of sport advance
Autorzy:: Adrian, J.
Nowak, A.
Wieczorek, A.
Rachwalski, K.
Molewski, M.
Sliwowski, R.
Wieczorek, J.
Powiązania:: https://bibliotekanauki.pl/articles/13226.pdf
Data publikacji:: 2013
Wydawca:: Uniwersytet Szczeciński
Opis:: The aim of the research was to find out the time reaction in a jump after a sound and visual stimulus. Another aim was to define the power of legs among the hockey field players during the pre-season and start season. The result of the hockey field players’ from AZS AWF Poznań and the Polish National Team were the subject of the research, which was carried out twice by the system of optical research – Opto-jump. The somatic and fat measurements were made. The results of the selected group (Polish National Men’s Team) may give the vision of the model of the players their power of the legs, the reaction time at a sound and visual stimulus. Thanks to these results we can compare them with the league team and follow the changes of the parameters level during the training season. In conclusion the training season didn’t have any essential influence on the measured parameters. The Polish Representation results were at far higher level than the league team. We can confirm that the level of the measured features don’t change in a training year.
Źródło:: Aktywność Ruchowa Ludzi w Różnym Wieku; 2013, 2[18]
2299-744X
Pojawia się w:: Aktywność Ruchowa Ludzi w Różnym Wieku
Dostawca treści:: Biblioteka Nauki

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