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Controllable Frequency Filters with Modern Active Elements
Preclík, Milan ; Jeřábek, Jan (referee) ; Koton, Jaroslav (advisor)
The work deals with design of transformation cells suitable for realization of higher orders frequency filters with possibility of cutoff frequency control. At first, there is a common description of frequency filters and active elements like current and voltage conveyors. Furthermore assumptions of cutoff frequency control are defined which result in a convenient characteristical equation. Phylosophy of synthetic elements DP , EP , DS , ES including a possibility of change of cutoff frequency is next in line. By exploitation of synthetic elements theory new circuit’s schemes of transformation cells are searched. The work continues with the choice of appropriate transformation cells for resulting circuit’s solutions of frequency filters with possibility of cutoff frequency control by using transfer coefficients of active elements or with help of passive elements. The work concludes with verification of its proper function based on a simulation executed in OrCAD and with practical implementation of choosen circuit’s solution.
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Automatic Acquisition of Data from the Internet for Training of Recognizers
Jeřábek, Jan ; Glembek, Ondřej (referee) ; Szőke, Igor (advisor)
This paper describes the design and creation of an application to facilitate downloading of audio data from Internet for training recognizers. Focuses on selection of optimal data source and analyzes options for searching and downloading from selected medium. On this base appropriate selection of tools and libraries is described. Description of the implementation follows where key parts of application are described. In the conclusion are summarised the achieved results and proposal for futher development.
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GUI for impedance measurement automation on Agilent 4294A
Dejdar, Petr ; Jeřábek, Jan (referee) ; Hanák, Pavel (advisor)
The goal of the bachelor thesis is to develop a control software for Agilent 4294A impedance analyser. Text of the theoretical section explains the dataflow of GPIB interface, basics of National Instruments LabView enviroment and the description of Agilent 4294A and its drivers for LabView. The function of the control software is a transfer of data from analyser, its conversion into Microsoft Excel .xlsx format + receiving screenshot in .png format from the analyser’s display. There are described all of subroutines contains setting and reading analyzers setting in this thesis. The conclusion sums up possible control software variation in regard to its complexity.
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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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Autonomous circuit analysis using Matlab
Zmeškal, Ladislav ; Jeřábek, Jan (referee) ; Koton, Jaroslav (advisor)
This bachelor’s thesis will deal with the creation of a description of a program for symbolic calculation of transfer function circuit, circuits, consisting of base current conveyors and admittance. In the theoretical part describes algorithmic methods analysis circuit together with the general characteristics of the current conveyor and a brief description of the program Matlab. The second part will describe the function created program, its parts, and specific examples of calculation of transfer functions. The last part of the validation of the results program created in MATLAB with the results of the SNAP program.
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Automated Processing of Network Service Logs in Linux
Hodermarsky, Jan ; Jeřábek, Jan (referee) ; Ilgner, Petr (advisor)
This thesis is focused on design and implementation of software for a prophylactic real-time logfile analysis and a consequent threat detection apparent therein. The software is to concentre particularly on network services, respectively, on the log files thereof, on Linux platform. The log files are observed for potential security breach attempts in regard to respective service as defined in the configuration file. The present thesis purports to reach the largest extent of versatility possible for a straightforward configuration of a new service which is to be monitored and protected by the software. An important asset of the work is a web-based interface accessible through HTTP protocol which allows the software to be administered remotely with ease.
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Simulation scenarios for analysis of behavior of transport networks
Koláčková, Aneta ; Koton, Jaroslav (referee) ; Jeřábek, Jan (advisor)
This master’s thesis deals with the issue of mobile networks, protocol suite TCP/IP and routing protocols. It focuses in particular on the functioning of the transport part of the third and fourth generation mobile networks and intends to fnd the most suitable options for their emulation. The master’s thesis compares two selected emulation programs through a series of tests that were performed on a server created for these purposes. The main outputs are two detailed comprehensive scenarios and solutions have been developed. The frst scenario deals with the overall transport network confguration. The second scenario is based on the frst one and is focused on troubleshooting of particular issues in this network. Their implementation helps to analyze the behavior of the transport part of the mobile network.
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Automated station for DC and AC measurements
Burian, Josef ; Jeřábek, Jan (referee) ; Koton, Jaroslav (advisor)
he object of this work is the suggestion of workplace for measurement of direct-current and alternating current quantities. This work is divided into several basic units. There are described separate elements of the workplace by the HW over the bus line up to the SW in full details. The selection of HW and the suggestion of service program is approached in the next part. To the program creation was used environment for virtual instrumentation VEE 9.2 made by Agilent company. Resulting program is described in this work in full details. The last part of this work concerns with test measurement and valuation of the whole work.
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Fully-differential frequency filters with nontraditional active elements
Dvořák, Jan ; Koton, Jaroslav (referee) ; Jeřábek, Jan (advisor)
Bachelor's thesis deals with designs of fully-differential frequency filters which operate in current mode where it is possible to control their parameters by change the transconductance or the amplification. The first part divides and describes in general frequency filters. Furthermore, there are described active elements together with their simple simulation models. The second part describes the design of frequency filter by M-C signal-flow graph and methods of transforming final circuit to fully-differential structure. Next part presents several structures of the second-order filter with their simulations in non-differential and fully-differential forms. Last part presents designs of boards of printed circuits and measurement results of two chosen circuits.
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Cyberattack generator
Gajdušek, Ondřej ; Jeřábek, Jan (referee) ; Hajný, Jan (advisor)
This work deals with the enhancement of software which generates cyberattacks. These enhancements are focused on application layer of ISO/OSI model. The firsh part of the work contains general description of cyberattacks. Concrete attacks which this work is dealing with are described more concretely. Next part deals with describing generator software and its enhancement. The last part is describing testing of newly implemented cyberattacks.
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