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User plane analysis in 4th generation mobile networks
Velsh, Ilya ; Novotný, Vít (referee) ; Krkoš, Radko (advisor)
The thesis describes the 2G, 3G and 4G mobile systems with a focus on the user plane. It decipt the problem of key performance indicators focusing on the characteristics of the user plane. It contains analysis of the basic data transmission services and requirements for their quality. The thesis also describes the user plane protocol stacks.
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Videoconference potentials in PBX Asterisk
Vlk, Bronislav ; Číka, Petr (referee) ; Krajsa, Ondřej (advisor)
This thesis deals with the possibilities of video conferencing in Asterisk PBX and their use in practice. They also described the contingencies and how its configuration. Particular attention is paid to the protocols SIP, IAX and H.323, which are described in one of the chapters. The thesis was created by the Asterisk PBX, which demonstrates cooperation with videoconferencing clients. The thesis describes the configuration files so that the central set. Conclusion the work assesses the use of codecs for different clients.
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Graphical Tool for Packet Generation
Mareš, Martin ; Bartoš, Václav (referee) ; Puš, Viktor (advisor)
This bachelor's thesis is about network packet generators. The first part is devoted to communication theory in computer networks from the perspective of TCP/IP architecture. The second part describes the results of search for currently available tools. The third part is devoted to design and implementation of own tool with graphical user interface for packets generation. The tool is designed object-oriented with an emphasis on ease of future expansion. The application concept includes also tools for generating dynamically changing series of packets to simulate network flows. The designed tool is implemented using the programming language C++ and the Qt framework. The last part contains an evaluation of results and comparison with the already available solutions.
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Bezpečná výměna zpráv mezi webovými službami
Trtil, Radovan
The thesis focuses on the development of an NPM package for end-to-end encrypted communication between web services. In the first phase of the work, a survey of available protocols for message transfer between web services is done with focus on encryption and message verification. The next part is a research of different chat applications that use the mentioned protocols. In the practical part, an NPM package that supports end-to-end encryption is designed and implemented with the selected protocol for use in various applications developed within the Spatial Hub lab. The correct functionality of the implemented solution is verified through unit tests and stress testing to ensure the robustness and performance of this package.
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Scalable addressing and routing protocol for ad-hoc networks
Drozdík, Tomáš ; Kratochvíl, Miroslav (advisor) ; Kliber, Filip (referee)
Ad hoc networks are dynamic networks with no pre-existing structure or centralized administration, where all the devices participate equally in the routing of packets. The lack of established structure complicates the effi- ciency of routing in such networks, and makes many address allocation meth- ods unsuitable. The thesis proposes a new routing and addressing protocol SARP, which works as a distance-vector routing protocol, but optimizes the sizes of the routing tables on the individual nodes by automatically approxi- mating the routes into groups where possible. Most importantly, SARP does not require any pre-established network structure nor unique router identi- fiers, and works only by exchanging the entries in routing tables. We show that SARP is a scalable routing protocol on networks where the addresses can be grouped well. Additionally, we show that SARP can, to some extent, use the reduced information for successful address assignment. However, a fully working address assignment in general settings will require further re- search in methods to globally detect address collisions without unique router identification. 1
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Traffic generator of industrial protocols
Šnajdr, Václav ; Blažek, Petr (referee) ; Martinásek, Zdeněk (advisor)
This bachelor thesis deals with generating data traffic of industrial SCADA protocols and their implementation into JMeter tool. This tool can be expanded with plugins. Three protocols DNP3, IEC61850 and IEC60870-5 are described in the theoretical part. The practical part is devoted to the design and implementation of the DNP3 protocol module and partly to the design of the IEC61850 protocol. The DNP3 module has been functionally tested. There is also an attempt to obtain the TASE.2 library.
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Preparation of a prefabricated hall with administration
Schrámek, Martin ; Kučera, Zdeněk (referee) ; Kantová, Radka (advisor)
The subject of the diploma thesis is a preparation of a prefabricated hall with administration in Prace. The production hall will be used to produce glass fiber reinforced concrete. Next part and extension is an administrative part. The text part of the thesis contains a technical report on the building technological project, time and financial plan of the building - object, coordinating situation of the building with broader relations of the transport routes, study of the realization of the main technological stages of the building object, item budget of the main building object, time schedule of the main building, sets of the main technological stages, detection protocols for individual months, limits, balance of resources and personnel, plan of selected material sources, technical report of construction site equipment, technological regulation of precast reinforced concrete frame, technological regulation of precast concrete frame coverings Kingspan panels, Control and test plan of precast concrete frame, covering of precast concrete frame panels Kingspan and ceiling panels of the Spiroll administration, alternative suggestion of the exchange ceiling construction administration and comparison, noise study and thermal technology.
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Laboratory exercises in Riverbed Modeler simulation environment
Lojek, Stanislav ; Bečková, Zuzana (referee) ; Langhammer, Lukáš (advisor)
This semestral thesis deals with the creation of a laboratory exercise for the course of Communication Technology. This course is designed for Teleinformatics in bachelor's degree program and should provide students with basic knowledge of network protocols and technologies. For this reason, the thesis deals with basic transport protocols, protocols for transmission via backbone networks and network layer protocols. The introductory part introduces the OPNET design environment, more precisely its free version of Riverbed Modeler Academic Edition 17.5, where the design of the laboratory exercises is done. The second part is a necessary theory to the exercises. The lab exercise is focused on differences in TCP (Transmission Control Protocol) and UDP (User Datagram Protocol) protocols. The second laboratory exercises is focused on technologies for transmission mainly on WAN (Wide Area Network) namely ATM (Asynchronous Transfer Mode) and Frame Relay. The last proposed exercises deals with the two most prominent Internet protocols that are used for communications IPv4 (Internet Protocol version 4) and IPv6 (Internet Protocol version 6) protocols. Guides for students have been created for this task, and at the end of each part, the complementary tasks and questions are given to students in oder to test the gained knowledge of the discussed issues.
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Laboratory exercise for RTG imaging systems
Kuchař, Otakar ; Macíček, Ondřej (referee) ; Mézl, Martin (advisor)
The aim of this Bachelor thesis is to study the X-ray and computed tomography. The theoretical section explains the basic physical principles, elementary particle, atom and ionizing. The following parts of the thesis deal with topics from the origin and various types of X-ray, to interaction of X-ray with tissue and X-ray detection. For computed tomography the thesis also explains data collection, the reconstruction of image using simple back projection, filtered back projection and algebraic reconstruction. In the practical part are analysed several measurements which were taken in the X-ray chamber designed for educational purposes by Leybold. The topics solve the attenuation of X-rays depending on the type and thickness of the material and the spectrum of the X-ray radiation. In the field of computerized tomography solve tasks as the change of contrast, parameters of acquisition and methods for reconstruction. The work includes prepared sample solutions to a laboratory experiments.
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Secure communication in systems using restricted devices
Michálek, Tomáš ; Martinásek, Zdeněk (referee) ; Malina, Lukáš (advisor)
This thesis presents the usability and analysis of cryptographic methods on devices with low computing power and low memory capacity. The thesis describes different methods and shows examples of their usability in practice. According to certain parameters of security methods, such as code size and memory size it is selected and compared symetric ciphers and authentication codes. There are also described some security protocols and possible attacks. The next part includes a comparison of ciphers and chosen candidates are tested on our microcontroller. In the end there are propose, implemented and analyzed security protocols.
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