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Wyszukujesz frazę "Bilski, T." wg kryterium: Autor


Wyświetlanie 1-8 z 8
Tytuł:
New Threats and Innovative Protection Methods in Wireless Transmission Systems
Autorzy:
Bilski, T.
Tematy:
authentication
confidentiality
cryptography
threats
vulnerabilities
wireless transmission
Pokaż więcej
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Powiązania:
https://bibliotekanauki.pl/articles/309265.pdf  Link otwiera się w nowym oknie
Opis:
Many improvements in the field of wireless communication can be observed nowadays. Some developments are gradual, others are revolutionary. It is obvious that each innovation in the area may lead to new security threats and vulnerabilities. Such technologies and transmission methods as: Near Field Communication (NFC), Visible Light Communication (VLC), handover, mesh networks, 5G cellular network, mobile IPv6, beamforming, cooperative beamforming, Multiple Input Multiple Output (MIMO), Orthogonal Frequency Division Multiple Access (OFDMA), transmission in Extra High Frequency (EHF) band are very important from the security point of view. In order to preserve high level of security one needs to identify, analyse and classify distinctive sets of threats and vulnerabilities as well as some emerging data protection opportunities related to innovative wireless transmission methods and technologies. This identification, analysis and classification is a main purpose of the paper. It will focus on cryptography in wireless systems, security vs. energy tradeoffs, physical layer security. For example, common problems related to cryptography may be solved with a use of physical layer security. Data confidentiality may be fulfilled with a use of beamforming and jamming, authentication may be performed with a use of out-of-band authentication model.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Parameterized hash functions
Autorzy:
Bilski, T.
Bucholc, K.
Grocholewska-Czuryło, A.
Stoklosa, J.
Tematy:
hash functions
HaF hash functions
function structure
S-box
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Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Powiązania:
https://bibliotekanauki.pl/articles/106144.pdf  Link otwiera się w nowym oknie
Opis:
In this paper we describe a family of highly parameterized hash functions. This parameterization results in great flexibility between performance and security of the algorithm. The three basic functions, HaF-256, HaF-512 and HaF-1024 constitute this hash function family. Lengths of message digests are 256, 512 and 1024 bits respectively. The paper discusses the details of functions structure. The method used to generate function S-box is also described in detail.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preparation and Characterisation of Fe/Ce Multilayer
Autorzy:
Dawczak-Dębicki, H.
Marczyńska, A.
Pacanowski, S.
Szymański, B.
Majchrzycki, Ł.
Kowalski, W.
Grembowski, W.
Bilski, T.
Smardz, L.
Tematy:
75.70.-i
68.55.-a
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Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:
https://bibliotekanauki.pl/articles/1030530.pdf  Link otwiera się w nowym oknie
Opis:
Ce/Fe multilayer (ML) with constant Fe (2 nm) and Ce (4.5 nm) sublayer thicknesses was prepared onto naturally oxidised Si(100) substrate using magnetron sputtering. Chemical purity of the sublayers was revealed in-situ by X-ray photoelectron spectroscopy (XPS) measurements. The structure of the sample was studied by standard low- and high-angle X-ray diffraction (XRD). Surface morphology of the ML was examined by atomic force microscopy. Magnetic properties of the sample was studied in the temperature range between 5 and 350 K using a vibrating sample magnetometer in a magnetic field up to 9 T. The hysteresis loops were measured in field perpendicular and parallel to the substrate. Furthermore, hydrogen absorption at a pressure of about 1000 mbar was studied at room temperature (RT) in Pd covered ML using four-point resistivity measurements. The solid state amorphisation reaction have been confirmed by XRD and magnetic measurements of the Ce/Fe ML. The absence of satellite peaks in the low - angle XRD pattern revealed no artificial layered structure. The above results show that interdiffusion of cerium and iron atoms is extremely fast at RT.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Air-crew exposure to cosmic radiation on board of Polish passenger aircraft
Autorzy:
Bilski, P.
Olko, P.
Horwacik, T.
Tematy:
dosimetry
cosmic radiation
radiation protection
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Wydawca:
Instytut Chemii i Techniki Jądrowej
Powiązania:
https://bibliotekanauki.pl/articles/147249.pdf  Link otwiera się w nowym oknie
Opis:
To establish the need for individual monitoring of air crew, exposure of air-crew members of Polish airlines LOT to cosmic radiation has been determined and several dosimetry methods tested in flight. Passive radiation dosimetry (using thermoluminescent LiF and chemically etched CR-39 track detectors) was supported by calculations with the CARI computer code. We found that the air crew of most of the LOT aircraft studied (with the exception of those flying ATR propeller aircraft) may somewhat exceed or, in certain conditions (depending on solar activity), may considerably exceed the effective dose level of 1 mSv per year. For crew members flying regularly on B-767 aircraft, the estimated yearly effective dose ranged between 2 mSv and 5 mSv, depending mainly on flying frequency and solar activity. During periods of enhanced intensity of cosmic radiation (i.e. during minimum solar activity) the effective doses could be close to the level of 6 mSv per year.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Usage of the graph clustering algorithm to the recognition of geotechnical layers
Autorzy:
Rabarijoely, S.
Bilski, P.
Falkowski, T.
Tematy:
soil layer
artificial intelligence
DMT test
clustering algorithm
geotechnical layer
recognition
soil type
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Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Powiązania:
https://bibliotekanauki.pl/articles/81821.pdf  Link otwiera się w nowym oknie
Opis:
The aim of the paper is to present the approach to the application of the graph clustering algorithm to the recognition of geotechnical layers from the dilatometer tests. Results of the measurements obtained from the DMT test in the test site (subsoil of one of the buildings in the Warsaw University of Life Sciences campus) were analyzed by the clustering algorithm which was able to extract the separate groups of the measurements, representing identical soil type. This method is parameterized, so its verifi cation by the geotechnical experts was necessary to determine the optimal parameter values. They lead to the determination of the soil types as close to the actual situation, as possible. Also, the output of the algorithm was analyzed by the geotechnical experts to identify and label the extracted soil types.
W artykule przedstawiono zastosowanie opartej na algorytmie clusteringu grafowego do rozpoznania warstw gruntu na podstawie badań dylatometrycznych. Wyniki pomiarów uzyskiwane dla podłoża jednego z budynków na terenie kampusu SGGW zostały przeanalizowane przez algorytm, który wyodrębnił grupy pomiarów charakterystyczne dla określonych rodzajów gruntów. Przeprowadzona analiza umożliwiała określenie optymalnych wartości parametrów pozwalających pogrupować pomiary i wyodrębnić najbliższe rodzaje gruntów. Ponadto, wyniki działania algorytmu zostały przeanalizowane przez geotechników w celu weryfi kacji identyfi kacji poszczególnych rodzajów gruntów wskazanych przez metodę.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of LiF : Mg,Cu,P (MCP-N) thermoluminescent detectors (TLD) for experimental verification of radial dose distribution models
Autorzy:
Gieszczyk, W.
Olko, P.
Bilski, P.
Grzanka, L.
Obryk, B.
Horwacik, T.
Tematy:
heavy charged particles
LiF:Mg,Cu,P (MCP-N)
radial dose distribution
thermoluminescence
unfolding
Pokaż więcej
Wydawca:
Instytut Chemii i Techniki Jądrowej
Powiązania:
https://bibliotekanauki.pl/articles/146734.pdf  Link otwiera się w nowym oknie
Opis:
In track structure theory, the radial distribution of dose, D(r), around an ion track plays a fundamental role in predicting the response of biological systems and physical detectors after a dose (or fluence) of ions. According to the formulations of D(r), the local dose at radial distances below 1 nm can reach values as high as 106 Gy. We propose a new method of verifying experimentally the radial dose distribution around alfa-particle tracks, using LiF:Mg,Cu,P (MCP-N) thermoluminescent detectors (TLD) which are able to measure gamma-ray doses in the kGy range via evaluation of their high-temperature TL glow peak structure over the temperature range of 350–550 centigrade. MCP-N detectors were irradiated with Am-241 alfa-particles at fluences ranging from 107 to 1011 particles/cm2, and by Co-60 gamma-ray doses ranging from several Gy up to the MGy. A number N of individual high-temperature TL peaks were analysed in the obtained glow curves by deconvolution, using the GlowFit code. For each of these peaks, an equation relating the intensity, A, of the TL signal obtained after alfa-particle irradiation and after gamma-ray doses, via the dose-frequency function, f alfa(D), was written in the form: A i alfa = integral A i gamma(D)x f alfa (D)dD, i 1,.., N. Using this set of N equations, where A alfa i and A gamma i(D) were known (measured), the single unknown function f alfa(D) was unfolded and converted to D(r). Parametric unfolding and the SAND-II iterative code were applied. While we were able to confirm the 1/r2 dependence of D(r) in agreement with D(r) expressions, we were unable to conclusively evaluate the dependence of D(r) at intermediate ranges of radial distance r. This preliminary result of our unique experimental approach to determine the radial dose distribution around the path of heavy charged particles in LiF detectors, requires further development.
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-8 z 8

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