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Multiplatform communication in access networks
Novotný, Bohumil ; Sýkora, Jiří (referee) ; Křepelka, Václav (referee) ; Škorpil, Vladislav (advisor)
Doctoral thesis deals with failure detection methods in wireless access network using distributed stochastic algorithms. A new method of detecting a fault based on the push-sum algorithm has been designed and simulated. Within the scope of the work objectives, the statistical credibility of the average push-sum protocol convergence rate representative and the effect of message loss during the calculation on the robustness of the system using this protocol were compared. Based on the acquired knowledge, the ability of the protocol to mathematically derive deviations from the real average of the values in the specified topology was demonstrated and thereby the existence of an abnormality in the network has been proved or refuted.
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Analysis of wireless network traffic
Guznar, Martin ; Kubánková, Anna (referee) ; Novotný, Bohumil (advisor)
This work solves the VoIP call switching system android with standard Long Term Evolution (LTE) on the IEEE 802.11 standard without losing the connection. In the theoretical part they are described in detail the various standards, protocols, their description and their interconnection. The proposed test will be in the system android with ongoing VoIP call. The outcome should be a capital loss graph Wi-Fi signal and follow your phone’s connection to LTE through a local provider, and all this without losing the connection and interruption of that ongoing VoIP call. The results of this study make it possible to determine how and under what circumstances will switch network from Wi-Fi to LTE and how it happened. Furthermore also obtain data that take place between a precise description of the procedure soft handoff.
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Adaptation of access networks for advanced networking technologies
Frollo, Martin ; Škorpil, Vladislav (referee) ; Novotný, Bohumil (advisor)
The bachelor thesis is focusing on the real-time services running in packet networks and problems that may arise while they are running. Specifically it is focused on the technology of VoIP service. There are many different signaling protocols to support this service. Among others, the SIP protocol is very widespread. In addition of the connection it is necessary to ensure the transmission of voice data. That is the task of the RTP protocol. This service and also others for which time is critical with increasing constraints on networks it needs to be frequently given the priority over traditional services like downloading files, and more. VoIP service has certain requirements for transmission parameters that must be followed for optimal function. They are for example, packet loss, one-way delay and delay variation. Most problematic is to ensure the optimal operation of the service on slower transmission routes. That is why it was necessary to establish mechanisms capable of real-time services to ensure sufficient network capacity to meet end user. These are, for example technologies of integrated services or differentiated services. At the present time, however, the technology of integrated services is not very widespread because of its inefficiency. On assembled telephone network made from available components in the laboratory, there are analyzed and confirmed some of the distinctive features and characteristics of the SIP protocol. Furthermore, measurements confirmed sufficient network capacity for VoIP service of the used network and parameters affecting security of the QoS have been evaluated.
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Procedure for the application of a high-speed VDSL2 technology
Coufal, Tomáš ; Šilhavý, Pavel (referee) ; Novotný, Bohumil (advisor)
A bachelor thesis sums up the basic line parameter, it deals with VDSL2 technology and G.fast. The work describes its attributes, profiles, masks and also an utilisation of vectoring. There is a comparation with other used technologies in this work. The last part is focused on simulations which are comparing different types of DSL connections and on an influence of vectoring to achievable effective distance.
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Analysis of Converged Networks by Simulations
Gardáš, Vít ; Novotný, Bohumil (referee) ; Škorpil, Vladislav (advisor)
The primary purpose of this study is to analyze converged high-speed networks with the usage of Matlab and Simuling. To set problematic area in the field of high-speed networks and solve this problem by creating a model of measurement and simulation of this model. A laboratory exercise is afterwards created on the specific problem.
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Diverzita slíďáků (Araneae: Lycosidae) vyskytujících se na agrárních terasách Znojemska
Novotný, Břetislav
The aim of this thesis is the evaluation of species diversity of the spider family Ly-cosidae in three locations near Znojmo: Nature Park Ječmeniště, Peklo u Šatova and Hnanice. In all the locations the specimens were collected on agricultural terraces used for cultivation of grapevine. The spiders were collected by the means of pitfall trapping. The traps were set on 8th May 2014 and collected on 5th June 2014, 3rd July 2014, 1st August 2014, 27th Sep-tember 2014 and 25th October 2014. Together there were 223 of Lycosidae spiders caught. 99 of them were juveniles and the remaining 223 were adults that were eventu-ally determined. Together there were detected 16 species belonging to 5 genera (Alope-cosa, Aulonia, Pardosa, Trochosa and Xerolycosa). The most significant finding is the finding of Pardosa bifasciata species, which is abundant only in warm areas. Although this species was collected in Peklo u Šatova and in Hnanice, it was not detected in NP Ječmeniště. None of the species collected in the three locations is listed in the Red List of Threatened Species of the Czech Republic.
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