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Power line transfer function generator
Vlček, Josef ; Martinásek, Zdeněk (referee) ; Mlýnek, Petr (advisor)
This bachelor's thesis deals with data communication over powerline (PLC). It describes the PLC technology, its basic division, the current opportunity to use, the sources of interference and the types of modulation. It analyzes the basic parameters of transmission line by means of which it is possible to create the equivalent transmission line model in two different ways either the mathematical model with multipath propagation or by using two-port with cascade parameters. The practical part contains measurement transfer function on different topologies. The measured values are compared with the numerical models. Furthermore, the transfer function generator was created which simulates the properties real distribution network.
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Model for power line communication
Baluch, Viliam ; Fujdiak, Radek (referee) ; Mlýnek, Petr (advisor)
This bachelor thesis is dealing with matters of data communication after power line. The thesis is including the PLC systems history, current possibilities of utilization and different types of modulations being used, interference sources and parameters of a transmission line. We will elaborate on methods of transmission line modeling and one of them will be used in the practical part of the thesis. The practical part consists of modeling of different types of topology and impedance endings applying generation of random transmission parameters and sizes of typology. We analyze results from practical measurement which are incorporated in a model. The model is then being compared with another one in terms of fixed parameters.
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Secure reading of smart meters
Chaloupková, Denisa ; Mlýnek, Petr (referee) ; Kohout, David (advisor)
The work deals with the implementation of the secure push mode of the DLMS standard. It introduces the DLMS/COSEM standard, contains a theory for message security and describes how push works and its attributes. The Gurux library in Java is used and the example gurux.dlms.push.listener is modified. The Raspberry Pi platform is used as the server. Wireshark and the Gurux DLMS Translator available in Gurux GXDLMSDirector were used to verify security of a push message. Subsequently, push messages are compared in terms of their size according to the type of security used. The larger the content of the data sent in the message, the smaller the additional data needed to secure the messages in proportion to the total volume.
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Simulation scenarios in NS2 demonstrating knowledge obtained in the MPKT course
Mašek, Jan ; Mlýnek, Petr (referee) ; Jeřábek, Jan (advisor)
The aim of the bachelor´s thesis is to develop simulation tasks for modeling of data networks. The tasks will be used in the course Modern communication technique (MKPT). The networks are simulated in the environment of Network Simulator 2 (NS2). A brief description of program environment NS2, as well as basics of Tcl language is mentioned in the introduction. Described is the possibility of simulation HTTP protocol in NS2 using OTcl PagePool classes. Totally six proposed tasks form the core of the thesis. The first task uses PagePool/Math and displays the simplest communication between client, server and cache. Next task uses PagePool/CompMath and it shows the communication between client, cache, Web server, FTP server and FTP client. The task, that uses PagePool/WebTraf class, simulates communication between two clients and three servers. The last three tasks are of different topologies and course of communication using PagePool/ProxyTrace. The exercises of this class are the most complicated and their input files allow defining whole communication. The outputs of exercises are given in graphs, log files of HTTP communication and the last task contains detailed instructions.
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Realization of a smart meter
Cu, Lukáš ; Mlýnek, Petr (referee) ; Lieskovan, Tomáš (advisor)
This thesis deals with the issue of smart metering, specifically electricity metering. It introduces the reader to the basic concepts associated with it and describes the technology used to implement such an electricity meter. The practical output of this work is a real smart electricity meter made of a singleboard platform Raspberry Pi 3 B, the Arduino platform and two external modules for measuring the state of electrical network. These modules are current sensor SCT-013-000 and a voltage sensor ZMPT101B. The software solution for controlling individual components and for working with the data is implemented using a combination of code created specifically for this purpose and of code from an external library belonging to Gurux company.
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Effective random number generator for limited devices
Michálek, Tomáš ; Mlýnek, Petr (referee) ; Fujdiak, Radek (advisor)
This thesis solves the problem of generating random numbers on low-power devices. Author describes possible ways of generating and implements selected generators of (pseudo)random numbers on MSP430F5438A. 4 generators were added by the enhancement of one of them and a new generator was created, using the phenomenon of temperature change in the surroundings. For each generator, test sequences were generated and these sequences were tested by the Dieharder, STS-NIST, and Visual Test. The output of the thesis is the functional implementation of the generators, their testing by statistical methods and their comparison between each other.
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Cryptography protocol with public key
Fujdiak, Radek ; Rášo, Ondřej (referee) ; Mlýnek, Petr (advisor)
The Master thesis is an introduction to cryptology. The Thesis describe cryptosystems and selects one ideal cypher for low-power microcontroler. In thesis provides manual for instal development program COde Composer Studio, basic implementation of selected cryptosystem with small numbers and suggestion for implementation selected cyptosystem with big numbers.
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Security design for system of remote quality measurement of electric power
Jakubíček, Michal ; Koutný, Martin (referee) ; Mlýnek, Petr (advisor)
Bachelor thesis in the first chapter deals with the concept of quality of electric power and its parameters. The next chapter is focused on systems that used remote data collection and the current direction of evolution of these systems. The third of the thesis discusses the symmetric and asymmetric cryptographic systems and their main representatives. The asymmetric system is described by the principle of calculating RSA and Diffie–Hellman. The next part deals with selected libraries that can count large numbers. Through the establishment of key using the Diffie–Hellman with these libraries and the subsequent measurement should be proved whether optimized library is faster than the other libraries. The evaluation of the used library in terms of speed and memory consumption is inculded in the final chapter. The appendix include installation instructions for the libraries BigDigits, GMP and OpenSSL in Visual Studio 2010.
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Implementation of network protocol into network simulator 2 environment
Janiga, Robin ; Mlýnek, Petr (referee) ; Koutný, Martin (advisor)
This thesis describes a protocol for the multiple data collection system and his implementation into Network Simulator 2 environment. The system defines two communication units. CU central unit and measuring unit MU. The units operate according to the rules defined by communication protocol. The content of this work is as follows. At the beginning is described the simulation tool, namely a system NS-2 and a tool for visualization of simulation results, the NAM. This is followed by a description of the proposed protocol, his principle of functions, units description and communication messages. The method of communication between units. Mainly was described the multicast and the types of multicast ASM and SSM. Additionally, was described the principle of unicast communication. This is followed by chapter describing methods of enlargement simulator. Adding an own protocol and support of multicast communication SSM. Adding a new protocol is represented by programming a new agent, a new application and a new protocol header definition. In this chapter are also described the necessary changes in the source files that are need to the recompilation. The main objective of this thesis is own implementation of the proposed protocol. In the programming language C++ were created two agents who represent a central and a measuring unit. These agents were compiled into a simulator and by using a simple script have been tested for functionality. The simulation script define MU 200 and one unit CU. Conclusion of work is devoted to simulation the load line between the central unit and "access" node. It was examined whether the use the method of cumulative acknowledgement saves the transmission capacity of line compared to normal method acknowledgement.
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