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Wyszukujesz frazę "Wodniak, J." wg kryterium: Autor


Wyświetlanie 1-4 z 4
Tytuł:
A hybrid-mesh solution for coverage issues in WiMAX metropolitan area networks
Autorzy:
Gierłowski, K.
Wodniak, J.
Nowicki, K.
Powiązania:
https://bibliotekanauki.pl/articles/308513.pdf
Data publikacji:
2008
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
IEEE 802.16
WiMAX
coverage
mesh
measurements
Opis:
The new WiMAX technology offers several advantages over the currently available (GSMor UMTS-based) solutions. It is a cost effective, evolving, and robust technology providing quality of service guarantees, high reliability, wide cov- erage and non-line-of-sight (NLOS) transmission capabilities. All these features make it particularly suitable for densely populated urban environments. In this paper we discuss the design and implementation difficulties concerning network coverage discovered in a test-bed implementation of WiMAX. We point out the presence of unexpected "white spots" in the coverage, which are not inherently characteristic of the WiMAX concept. As a possible remedy to this significant drawback of the otherwise very promising technology, we consider reconfigurable mesh organization of WiMAX base stations. We also suggest directions for further development of this kind of network operation, partly based on our practical experience. Despite the clear advantages of the mesh mode in WiMAX networks, its development is currently at an early stage, due to the high complexity of the necessary mechanisms. In this situation, we propose an original, much simpler solution: the so-called support-mesh mode.
Źródło:
Journal of Telecommunications and Information Technology; 2008, 1; 20-28
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modulo N Backoff Scheme for Effective QoS Differentiation and Increased Bandwidth Utilization in IEEE 802.11 Networks
Autorzy:
Janczar, T.
Konorski, J.
Wodniak, J.
Pawlikowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/308888.pdf
Data publikacji:
2009
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
channel access
MAC
performance analysis
random backoff
WLAN
Opis:
The paper presents a new modulo N channel access scheme for wireless local area networks (WLANs). The novel solution derives from the distributed coordination function (DCF) of the IEEE 802.11 standard, further elaborated as enhanced distribution channel access (EDCA) by the 802.11e draft specification. The main innovation concerns improvement of the binary exponential backoff scheme used for collision avoidance in 802.11 networks. The most appealing feature of the new modulo N backoff scheme is that it outperforms the original 802.11 solution in terms of channel utilization ratio under any traffic conditions. Furthermore, the modulo N proposal can be naturally augmented with QoS differentiation mechanisms like 802.11e extensions. The prioritized modulo N scheme achieves better throughput-delay characteristics for multimedia traffic when compared with the original 802.11e proposal. At the same time, the new solution retains backward compatibility and includes all features which have made IEEE 802.11 networks extremely popular nowadays.
Źródło:
Journal of Telecommunications and Information Technology; 2009, 2; 41-47
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of the Multi-Threaded Interval Algorithm for the Pareto-Set Computation
Autorzy:
Kubica, B. J.
Wodniak, A.
Powiązania:
https://bibliotekanauki.pl/articles/308050.pdf
Data publikacji:
2010
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
interval computations
multicriterial analysis
multithreaded programming
Pareto set
POSIX threads
shared-memory parallelization
Opis:
Previous investigations of the authors surveyed the possibility of applying interval methods to seek the Paretofront of a multicriterial nonlinear problem. An efficient algorithm has been proposed and its implementation in a multicore environment has been done and tested. This paper has two goals. First one is to tune the developed algorithm to increase the speedup of the multi-threaded variant. The second one is to extend the algorithm to compute not only the Paretofront (in the criteria space), but also the Pareto-set (in the decision space). Numerical results for suitable test problems are presented.
Źródło:
Journal of Telecommunications and Information Technology; 2010, 1; 70-75
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
CVD diamond detectors for fast alpha particles escaping from the tokamak D-T plasma
Autorzy:
Wodniak, I.
Drozdowicz, K.
Dankowski, J.
Gabańska, B.
Igielski, A.
Kurowski, A.
Marczewska, B.
Nowak, T.
Woźnicka, U.
Powiązania:
https://bibliotekanauki.pl/articles/146634.pdf
Data publikacji:
2011
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
CVD diamond detector
lost alpha particles
high temperature plasma diagnostics
Opis:
Measurements of the so-called lost alpha particles escaping from thermonuclear plasma in future tokamaks (such as ITER) for energy production would be essential for monitoring the energy balance in these devices. The detection would have to be carried out in a harsh environment (with high nuclear radiation fluxes, high temperature, etc.), which limits the use of common semiconductors for charged particle detection. Diamond seems to be an attractive material for alpha particle detectors in these conditions. In this paper an analysis of properties of a diamond detector for spectrometric alpha measurements is reported. A high purity CVD (chemical vapour deposition) single crystal diamond detector was used, fabricated for this dedicated application by the Diamond Detector Ltd. The energy calibration was carried out using a triple alpha particle isotope source, AMR33 (239Pu, 241Am, 244Cm). A very good energy resolution, ca. 20 keV at ca. 5.5 MeV had been obtained, which is comparable to that of the silicon detector. The linearity of the diamond detector amplitude response to the alpha particle energy was analyzed with the use of mono-energetic (0.4–2 MeV) ion beam from a Van de Graaff accelerator. Results of the measurements using the AMR33 source deviate at most 30 keV from the calibration line obtained in this way.
Źródło:
Nukleonika; 2011, 56, 2; 143-147
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-4 z 4

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