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Wyszukujesz frazę "Dubois, R." wg kryterium: Autor


Wyświetlanie 1-7 z 7
Tytuł:
Tunneling Activities Detection Using Machine Learning Techniques
Autorzy:
Allard, F.
Dubois, R.
Gompel, P.
Morel, M.
Powiązania:
https://bibliotekanauki.pl/articles/309515.pdf
Data publikacji:
2011
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
cyberdefense
network security
decision trees
hidden Markov models
HTTPS tunnel
RandomForest
Opis:
Tunnel establishment, like HTTPS tunnel or related ones, between a computer protected by a security gateway and a remote server located outside the protected network is the most effective way to bypass the network security policy. Indeed, a permitted protocol can be used to embed a forbidden one until the remote server. Therefore, if the resulting information flow is ciphered, security standard tools such as application level gateways (ALG), firewalls, intrusion detection system (IDS), do not detect this violation. In this paper, we describe a statistical analysis of ciphered flows that allows detection of the carried inner protocol. Regarding the deployed security policy, this technology could be added in security tools to detect forbidden protocols usages. In the defence domain, this technology could help preventing information leaks through side channels. At the end of this article, we present a tunnel detection tool architecture and the results obtained with our approach on a public database containing real data flows.
Źródło:
Journal of Telecommunications and Information Technology; 2011, 1; 37-42
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Seasonal pattern of the chlorophyll-a in a coastal lagoon from the Southern Baja California (Mexico), described with in situ observations and MODIS-Aqua imagery
Autorzy:
Jimenez-Quiroz, M.C.
Martell-Dubois, R.
Cervantes-Duarte, R.
Cerdeira-Estrada, S.
Powiązania:
https://bibliotekanauki.pl/articles/2078912.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
chlorophyll a
coastal lagoon
remote sensing
transitional zone
climatology
seasonal pattern
phytoplankton biomass
distribution
multivariate statistical method
MODIS-Aqua data
Opis:
This study aims to estimate, with a climatology perspective, the average seasonal pattern of phytoplankton biomass (SP-PBavg) and its distribution in Bahia Magdalena (Mexico) as a baseline to evaluate PB changes in future studies. This lagoon is in a semi-arid region, lacks river discharges, and channels with vegetation are limited at the north and south zones. SP-PBavg was estimated with chlorophyll-a (chl-a) data obtained in 21 sites on daily MODISAqua imagery (2002—2013; n = 2,418) from a ready-to-use public database. The first step was to establish criteria to use imagery and validate with in situ observations taken in 14 sites (2002—2011; n = 312). MODIS-Aqua overestimated chl-a (mean ± confidence interval95: 5.09 ± 0.97 mg m−3; n = 225); with differences among sites. There were no differences near the inlet lagoon (p <0.05), where the water characteristics are Case-1 while values were significantly higher in the eastern shore and two or three times higher in the mouth of north and south channels, whose water characteristics are similar to Case-2. Multivariate statistical methods allow defining zones into the lagoon and describe their SP-PBavg with both in situ and MODIS Aqua data, but the former’s sample size was small, and the patterns were only delineated. In the inlet surroundings, chl-a peaks from March/April to June/July. On the eastern shore, where MODIS Aqua and in situ data were correlated, despite concentration differences, chla is higher from March/April to October, with peaks in June and September. In the mouth of internal channels, chl-a was higher than other sites and during a longer period; however, the very high MODIS-Aqua values suggest that the satellite also detects organic matter supplied by phytoplankton and other vegetables, which explain the high lagoon’s productivity. These results validate the use of MODIS Aqua imagery to describe the chl-a seasonal patterns in the sea’s vicinity
Źródło:
Oceanologia; 2021, 63, 3; 329-342
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Anomalous Dielectric Spectra of Ferro- and Ferrielectric Liquid Crystalline Phase in MHPNBC
Autorzy:
Dubois, F.
Douali, R.
Wawrzyniak, A.
Legrand, Ch.
Ropa, P.
Wróbel, S.
Dąbrowski, R.
Powiązania:
https://bibliotekanauki.pl/articles/1399013.pdf
Data publikacji:
2013-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.22.Gm
77.84.Nh
64.70.M
Opis:
MHPOBC analogue with long achiral alkyl chain has been investigated by dielectric spectroscopy studies in the wide temperature range. Low frequency dielectric spectroscopy revealed the existence of normal ferroelectric phase (in a narrow gap), two ferri- and three antiferroelectric phases in addition to paraelectric phase and alpha sub-phase. The compound studied shows exceptionally strong dependence of the dielectric permittivities on measuring electric field in the temperature range of ferro- and ferrielectric phases.
Źródło:
Acta Physica Polonica A; 2013, 124, 6; 937-939
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preparation of highly pure cyclo-polylactides by optimization of the copper-catalyzed azide-alkyne cycloaddition reaction
Otrzymywanie cyklopolilaktydów o wysokiej czystości poprzez optymalizację katalizowanej miedzią cykloaddycji azydek-alkin
Autorzy:
Liénard, R.
Josse, T.
De Winter, J.
Dubois, F.
Gerbaux, P.
Coulembier, O.
Powiązania:
https://bibliotekanauki.pl/articles/947211.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
Tematy:
lactide
ring-opening polymerization
copper-catalyzed azide-alkyne cycloaddition
cyclization
laktyd
polimeryzacja z otwarciem pierścienia
cykloaddycja azydek-alkin katalizowana miedzią
cyklizacja
Opis:
This work reports on the preparation of highly pure cyclo-polylactides (Mn ≈ 4 000 g • mol-1) by the optimization of the copper-catalyzed azide-alkyne cycloaddition (CuAAC) reaction applied on α-azide-ω-alkyne linear polylactide (PLA) precursors. By adjusting parameters such as the rate of reactant addition and the catalyst loading, monocyclic PLA's with a degree of purity of 93 % are obtained in few minutes. Highly pure monocycles (purity as high as 99.9 %) are also possibly prepared in few hours.
Opisano optymalizację syntezy cyklopolilaktydów w katalizowanej miedzią(I) reakcji cykloaddycji azydku do alkinu (CuAAC), której celem było uzyskanie polimerów o wysokiej czystości iśrednim ciężarze cząsteczkowym Mn ≈ 4 000 g • mol-1. Do reakcji użyto prekursorów, którymi były liniowe α-azydo-ω-alkinowe polilaktydy (PLA). Dobrano warunki syntezy, takie jak szybkość dodawania reagenta oraz ilość używanego katalizatora, które pozwalają na otrzymanie w ciągu kilku minut monocyklicznego PLA o stopniu czystości 93 %. Prowadząc syntezę w ciągu kilku godzin można otrzymać monocykliczny polimer o czystości do 99,9 %.
Źródło:
Polimery; 2017, 62, 4; 283-290
0032-2725
Pojawia się w:
Polimery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
SETHI: The Flying Lab
Autorzy:
Bruyant, J. P.
Dreuillet, P.
Du Plessis, O. R.
Oriot, H.
Dubois-Fernandez, P.
Cantalloube, H.
Powiązania:
https://bibliotekanauki.pl/articles/226573.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
SETHI
flying lab
SAR
very high resolution
PolInSAR
bistatic images
radar-optronics complementarity
change detection
biomass
climate change
environment
security applications
Opis:
This paper presents the new-generation test bench SETHI, developed by ONERA, the French Aerospace Lab. SETHI is a medium range platform dedicated to environmental, scientific and security applications. The first part of this paper describes the system architecture, the development state and the future capabilities. A set of recent significant results are presented: these results cover various applications, such as high spatial resolution imaging, change detection between two acquisitions, biomass measurement in the rain forest, bistatic imaging and innovative measurements, such as air-to-air imaging or circular imaging.
Źródło:
International Journal of Electronics and Telecommunications; 2011, 57, 1; 29-35
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Polymorphism of Chiral Thioester Studied by Dielectric Spectroscopy
Autorzy:
Wawrzyniak, A.
Chruściel, J.
Douali, R.
Dubois, F.
Leblond, J.
Legrand, Ch.
Ossowska-Chruściel, D.
Marzec, M.
Ropa, P.
Czerwiec, J.
Wróbel, S.
Powiązania:
https://bibliotekanauki.pl/articles/1399012.pdf
Data publikacji:
2013-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.84.Nh
64.70.M-
77.22.Gm
77.22.Ej
Opis:
(S)-(+)-4'-[(4-(1-methylheptyloxycarbonylphenyl) thiocarbonylphenyl]-decyloxybenzoate (in short 10.OPOSMH) was studied by complementary methods. The substance shows rich polymorphism. In addition to ferroelectric and antiferroelectric smectic C* phases it possesses three ferrielectric sub-phases. Phase transitions between the phases were revealed by differential scanning calorimetry and static dielectric permittivity measurements. The aim of this paper was to study phase transitions and differences in dielectric spectra shown by different phases. Collective and molecular dynamics of all phases shown by 10.OPOSMH will be discussed in terms of theoretical models. Dielectric spectra of antiferroelectric phase show two characteristic dielectric relaxation modes: one connected with the molecular process (reorientation around the short axis) and the other originating from fluctuations of antiferroelectric order parameters.
Źródło:
Acta Physica Polonica A; 2013, 124, 6; 933-936
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-7 z 7

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