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New Trends in Femtocell Backhaul Security

100%

Rohlik M. , Vanek T.

Przegląd Elektrotechniczny

2013

tom R. 89, nr 2b

240--244

One of the relatively new services presented by mobile operators is a femtocell. A femtocell is a network located at the residential premises helping to extend the mobile signal to places which are difficult to cover. Furthermore, it enables the mobile operator to provide attractive service to the customer since the femtocell is connected to the mobile operator network using an IP based backhaul link over the public Internet. To ensure appropriate security over the untrustworthy environment, an IPsec tunnel is established between the femtocell access point and the provider’s security gateway located at the core network perimeter. IPsec itself wasn’t originally proposed to carry small voice packets resulting in a redundant overhead. This paper examines other security procedures, such as transport layer security (TLS) and Datagram TLS (DTLS) protocols.

W artykule zaprezentowano porównanie systemów ochrony pakietów danych w sieci komunikacji femtokomórek. W celu nawiązania i zabezpieczenia połączenia zastosowano tu tunelowanie IPsec między bramką operatora, a odbiornikiem, femtokomórką. Testom poddano procedury ochrony w protokołach TLS oraz DTLS.

Accumulation of cadmium by halophyte species Juncus gerardii Loisel

80%

Podlipna R. , Motkova K. , Vanek T.

tom 14

In our experiments, we observed the accumulation of Cd2+ by in vitro cultured Juncus species cultivated on medium with 100μM Cd and without or with NaCl (300 and 900 μM) for 7 days. The content of Cd2+ in plants cultivated on medium without NaCl continuously increased. On the other hand, in the presence of NaCl, the plants accumulated the highest amount of Cd2+ during first 24 hours and then the accumulation decreased.

Flora of toxic depots in selected industrial zones

61%

Petrik P. , Soudek P. , Benesova D. , Najmanova P. , Najman M. , Vanek T.

tom 78

nr 4

327-334

Floristic composition in three industrial areas with soils contaminated by heavy metals (As, Cd, Cu, Hg, Pb, Zn) and organic pollutants (polychlorinated biphenyls) was studied. The content of Pb was only significantly correlated with the floristic composition and explained 13.8% of its variability considering spatial dependency of the sites. No correlation was found for PCBs. Altogether, 237 plant vascular species were found at three study sites (117, 133 and 105, respectively). The three study areas differed in their species composition represented by their own characteristic species. The gradient in the content of natives/non-natives, species number, prevailing life forms and indicator values for plant species investigated was revealed. Based on our results, for phytoremediation purposes we can select productive plant species with high biomass and ability to accumulate large amounts of heavy metals or organic compounds and surviving on soils with low mineral content.