Autor: Jabczyński, J. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: A branch hash function as a method of message synchronization in anonymous P2P conversations
Autorzy:: Kobusińska, A.
Brzeziński, J.
Boroń, M.
Inatlewski, Ł.
Jabczyński, M.
Maciejewski, M.
Powiązania:: https://bibliotekanauki.pl/articles/331275.pdf
Data publikacji:: 2016
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: peer-to-peer system
synchronization algorithm
conversations
anonymity
system peer-to-peer
algorytm synchronizacji
anonimowość
Opis:: Currently existing solutions rarely protect message integrity, authenticity and user anonymity without burdening the user with details of key management. To address this problem, we present Aldeon—a protocol for anonymous group conversations in a peer-to-peer system. The efficiency of Aldeon is based on a novel tree synchronization algorithm, which is proposed and discussed in this paper. By using this algorithm, a significant reduction in the number of exchanged messages is achieved. In the paper, the formal definition of the proposed hash branch function and the proof of its efficiency are presented.
Źródło:: International Journal of Applied Mathematics and Computer Science; 2016, 26, 2; 479-493
1641-876X
2083-8492
Pojawia się w:: International Journal of Applied Mathematics and Computer Science
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Wigner transform approach to dynamic-variable partially coherent laser beam characterization
Autorzy:: Jabczyński, J.
Gontar, P.
Gorajek, Ł.
Powiązania:: https://bibliotekanauki.pl/articles/202109.pdf
Data publikacji:: 2020
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: laser beams
partial coherence
high-power continuous-wave lasers
Wigner transform
aberrations
Opis:: 1) Background: the modeling, characterization, transformation and propagation of high-power CW laser beams in optical (including fiberoptic) trains and in the atmosphere have become hot topics in laser science and engineering in the past few years. Single-mode output is mandatory for high-power CW laser applications in the military field. Moreover, an unstationary, dynamic operation regime is typical. Recognized devices and procedures for laser-beam diagnostics could not be directly applied because of dynamic behavior and untypical non-Gaussian profiles. 2) Methods: the Wigner transform approach was proposed to characterize dynamically variable high-power CW laser beams with significant deterministic aberrations. Wavefront-sensing measurements by means of the Shack-Hartmann method and decomposition into an orthogonal Zernike basis were applied. 3) Results: deterministic aberration as a result of unstationary thermal-optic effects depending on the averaged power of the laser output was found. Beam quality determined via the Wigner approach was changed in the same way as the measurements of the beam diameter in the far field. 4) Conclusions: such an aberration component seems to be the main factor causing degradation in beam quality and in brightness of high-power CW laser beams.
Źródło:: Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 1; 141-146
0239-7528
Pojawia się w:: Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:: Biblioteka Nauki

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