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Support of QoS in MANET networks
Figurny, Roman ; Mácha, Tomáš (referee) ; Vajsar, Pavel (advisor)
The theoretical part of Master's thesis has been dealing with issues of MANET networks, issues of providing quality of services in MANET networks and analysis of various implementations of quality of services in these networks. At the start of the practical part of this thesis was described modified OLSR process model with support of quality of services. In simulation program OPNET Modeler was designed a topology of MANET network, firstly was run a simulation of this network without any support of quality of services and then was run a simulation with support of quality of services. The results of these simulations were analyzed, compared and graphically interpreted. In the next part of this thesis was designed a real MANET network with OLSR support. OLSR network communication was captured with the use of Wireshark. In the last part of this thesis was firstly described a meaning and functions of plugins in OLSR implementation and then was developed a plugin which is responsible for sending messages which contain a state of the links between nodes of MANET networks.
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Single sign-on systems
Takács, Endre ; Vajsar, Pavel (referee) ; Morský, Ondřej (advisor)
The subject of this bachelor thesis is the so-called single sign-on technology in context of access control methods. It describes the solutions used in wide computer systems, options of implementing security and integration into the Microsoft Windows operating system. The next part specifies the web interface of this technology, where the explanation of the basic terms and principals are also included. It is focused on the Oauth, which will be used in the practical part of work.
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Single sign-on systems
Takács, Endre ; Vajsar, Pavel (referee) ; Morský, Ondřej (advisor)
The subject of this bachelor thesis is the so-called single sign-on technology in context of access control methods. It describes the solutions used in wide computer systems, options of implementing security and integration into the Microsoft Windows operating system. The next part specifies the web interface of this technology, where the explanation of the basic terms and principals are also included. It is focused on the Oauth, which will be used in the practical part of work.
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Verification of the statistical reliability of simulation results in OPNET Modeler environment
Fördős, András ; Vajsar, Pavel (referee) ; Hošek, Jiří (advisor)
Project is focused to verify the credibility of the results of statistical simulation in the surround of OPNET Modeler. At the beginning of the project is a short introduction to the problematic of OPNET Modeler. It describes the basic concepts of mathematical statistics, data types and some basic statistical charakteristics. In the project was created model of LAN network, were set up three different types of runs and several monitored statistics. In this project are listed setting of the model, startup parameters of some runtime simulations, prefered variety of statistics and the possibility to display final results of statistics. Description of options displaying final results of statistics is supplemented by model characteristics. Created model was further extended and modified. Have been added network services, has changed the number of nodes and the duration of the simulation. Results of analysis of the original scenario are compared to the results of a modified scenario, which are scheduled. At the end of this project are obtained result, recommended way and form of displaying basic statistics and advice on the number of simulation runs needed to obtain reliable results.
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Simulation of routing protocols in ns3 simulation environment
Masár, Marek ; Hošek, Jiří (referee) ; Vajsar, Pavel (advisor)
The first part of thesis is about networks that are divided based on area. It includes also basic characteristic of Manet networks. The next chapter is about distribution of routing protocols into preactive, reactive, hybrid. In the simulation, there is comparison of 3 routing protocols, which are described in this chapter. The simulation is performed in program called Ns-3, more specifically in version 3.14. In the third chapter, this network simulator is described more closely. Here is also mentioned its continuity on previous version Ns-2. The goal of this simulation is to create a network with implemented routing protocols and with certain number of nodes, which has configured mobility, so the network looks like Manet network as much as possible. There are also 2 applications created, which were used to determine the delay for each routing protocol. Another part of thesis is about implementation of the quality of service (QoS) and energy model for each routing protocol. Energy model was used to calculate the remaining energy of node. Next activity summarizes how the implementation of QoS changed delay for used applications and how it changed the energy consumption of a node. The result of thesis is that the voice applications was preferred after the QoS implementation. The value of delay increased for ftp application. Percentually, the improvement for voice traffic was 30-31 %. The increase of delay was percentually 7-19 %. The difference in remaining energy after QoS implementation was about 1%. The actual amount of battery in the beginning of simulation was 1 J.
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Development of evaluation model of MANET in NS-3 environment
Gilík, Aleš ; Vajsar, Pavel (referee) ; Hošek, Jiří (advisor)
This bachelor thesis is focused on Manet networks and creation of web application for generate configuration file which is simplifying simulation of Manet networks. The theoretical part concerns with description of Manet networks, distribution of routing protocols and closer look on five of the protocols. In the next part is described simulator Ns-3 with his content for simulations. The practical part is describing creation of configuration file and his elements. For that was created web application in PHP language. All used technologies for creation of the application are described in this thesis. The web application is fully processed and operational.
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Mathematical modelling of HTTP network traffic
Miklica, Jan ; Vajsar, Pavel (referee) ; Molnár, Karol (advisor)
The aim of this thesis is to capture network tradic on the HTTP protocol. Then from the captured tradic to analyze parameters using selected models and compare them with the achal properties of real network traffic. This bachelor´s thesis describes the HTTP protokol and mathematical modeling, and simulation models developed for it. The document described the capture of data tradic on HTTP using Wireshark. In the next part are performed elemental analysis of selected models. In conclusion the analysis results of the selected models are described.
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Simulation of OLSR routing protocol in OPNET Modeler environment
Potfay, Attila ; Růčka, Lukáš (referee) ; Vajsar, Pavel (advisor)
The main task of this bachelor's thesis is to simulate the routing protocol OLSR (Optimized Link State Routing Protocol) in the OPNET Modeler environment, and to realize a scenario where it is possible to model protocol functionality and properties. The processing of each simulation is divided into three main parts and they are the description of a situation, configuration and the evaluation of results. In the first scenario there is shown the functionality of the protocol, in the second simulation there are scenarios with the nodes of different movement speed, and in the third simulation the energy requirements of the protocol from the perspective of quantity of the transmitted packets are evaluated. Furthermore, in this thesis there is analyzed the way of implementing the routing protocol OLSR in the OPNET Modeler environment. The implementation structure is divided into three levels: the level of a node, a manager and the routing protocol. At these levels the process models, transitions, code blocks, variables and key codes of functions are processed. Next, there is introduced the possibility of extending the protocol. In order to extent the OLSR protocol, the work focused on supporting services quality. The functions are edited for the protocol to create logs, read out the current transfer speed from the statistics, add it to the created pool and organise writing the logs. The results are evaluated and clearly described. This work provides the theoretical basics: it deals with the primary characteristics of Mobile Ad-hoc networks (MANET), describes in detail the OLSR routing protocol and provides information about the OPNET Modeler simulation environment.
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MANET Routing Protocol with Quality of Service Support
Vajsar, Pavel ; Medvecký, Martin (referee) ; Bečvář, Zdeněk (referee) ; Koton, Jaroslav (advisor)
The web and mobile web traffic is growing rapidly due to service accessibility in densely populated areas and massive usage of smart hand held devices (smartphones, pads and Internet dongles). This is a challenge for mobile operators and service providers, because it forces systematically increasing network throughput capacity and in parallel to keep this investment on profitable basis. On the other side, the user satisfaction with mobile broadband service should be considered as well, in order to balance the user expectations and mobile operator investments. Our work provides extensive QoE study for different conditions in sense of mobile web service, web content, network conditions and end user device. Finally, the obtained results create basis for more dimensional overview of mobile web QoE and allow to recognize quality and saturation thresholds based on network parameters. Further, obtained data provide base for design three prediction models for prediction of MOS (one for notebook, one for mobile device) and acceptability.
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IPTV transmission planner using tomcat and stripes and hibernate frameworks
Vajsar, Pavel ; Komosný, Dan (referee) ; Burget, Radim (advisor)
Bachelor´s thesis deals with concept of web application for planning IPTV broadcast - IPTV client. The specific broadcast with protocols RTP and RTCP is not included. After logging on you are able to record programs (video files), manage users, create feedbacks and create new roles as well with this application. First part of this work considers with analytical concept of application - the database model, diagram of cases of use and activity diagram. The next part deals with using software resources, user interface design and data exchange between the application and the database. Other areas, which are better described in this project, are for example safety of application, role separation and upload files with bigger size on the server.
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