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Automatic verification of software packages with help of DNS
Sehnoutka, Martin ; Dvořák, Jan (referee) ; Jeřábek, Jan (advisor)
Tato diplomová práce se zabývá problémem bezpečné distribuce software. Je navrženo zlepšení s pomocí doménového systému, který je použit pro uložení verifikačních klíčů, potřebných pro ověření integrity balíků stáhnutých pomocí správce balíků. Navíc je navržena rozšířená verze, které se zabývá zabezpečením metadat repositářů. Obě verze jsou implementovány v jazyce Python a integrovány do správce balíků dnf. Tato implementace je otestována ve virtuálním prostředí, diskutována a zhodnocena z hlediska způsobené zátěže.
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PH controller for aquarium
Dvořák, Jan ; Fedra, Zbyněk (referee) ; Šebesta, Jiří (advisor)
This bachelor’s thesis deals with the system which is designed as a pH regulator for aquarium water. The first and second chapter are aims to the basic requirements and possibilities on controlling of the potential of hydrogen in water. Main methods of the pH measuring, its controlling and regulation are included. The third chapter presents a design of the pH regulator system. The practical and software solution of this project is presented in the fourth and fifth chapter. There are described in detail the main blocks of the pH regulator - amplifier, galvanic isolator and output power stage. The results of the testing and measuring of the designed subsystems are introduced in the last part of the work.
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Detection of anomalies in network traffic using compression methods
Blažek, Libor ; Dvořák, Jan (referee) ; Blažek, Petr (advisor)
The objective of the thesis is to design a practical demonstration of the functionality of selected compression methods. The following chapters will discuss the attacks on terminals and mentioned some measures. The show will be processed using two methods development environment. The attacks will detect anomalies in the network and subsequently carried out at one of the sample data compression methods. Data will be collected as normal operation at the terminal station, and then in the attack.
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Analysis of differential and non-differential filtering structures with adjustable current amplifier
Dvořák, Jan ; Vrba, Kamil (referee) ; Jeřábek, Jan (advisor)
The master thesis deals with designs of the single-ended and the fully-differential secondorder frequency filters with adjustable parameters. This filters operate in the current mode where main element is the current amplifier DACA (Digitally Adjustable Current Amplifier). The first part describes basic behaviour of frequency filters and distribution according to filter funcion, used parts and structure. The second part of thesis describes the design of the frequency filters by the M-C signal-flow graphs and the transformating single-ended structures to the fully-differential forms. The next part deals with properties of the active elements and their simulation models. The following part describe six circuits of the frequency filters with adjustable parameters and their simulations. Four simulation models with different properties were used for simulating of the DACA in the each circuits. The last part deals with the practical design and measurement of the selected frequency filters.
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Design of Standby Handsfree Headset
Dvořák, Jan ; Sládek, Josef (referee) ; Křenek, Ladislav (advisor)
The task for this bachelor work is to design a device, which can connect a user with the emergency call center in case it is needed. It has to be an accessory for the interior of the new Škoda Kodiaq vehicle and it can not affect its design or the production. The solution is a Bluetooth handsfree headset, connected to the Škoda eCall. It is always in the car ready to be used. Not a single car manufacturer offers such a device. Therefore it is so unique.
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Synthesis of the electronically reconfigurable frequency filters
Michalička, Filip ; Dvořák, Jan (referee) ; Langhammer, Lukáš (advisor)
This diploma thesis deals with design of reconection-less electronically reconfigurable filter structures which have single input and single output using unconventional active elements, which have ability to adjust one of their parameter e.g. gain or transconductance. The first part describes basic parameters of frequency filters, the division of filters by frequency transfer response and used circuit elements, their operational modes, the principle of reconnection-less electronically reconfiguration and the circuit design method MUNV. Second part describes all active elements used in the proposal of filters, their properties and the implementation using existing transistor-level models. The third part contains the design of three reconnection-less electronically reconfigurable filters and the simulations results obtained from simulation programs OrCAD Capture and PSpice. The obtained results were compared with theoretical behaviour. This part also contains results of these analyses: sensitivity, parasitic, Monte Carlo and temperature to determine the behaviour in varied cases.
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Tremolo effect with high modulation frequency range
Pazdera, Michal ; Dvořák, Jan (referee) ; Kubánek, David (advisor)
This work was created while designing the dynamic modulation effect „tremolo“. Because there are certain conditions (wide modulation frequency range, precise input of parameters and precise indication), this work is going to be constructed mainly of searching the right components and schematics, especially wide range frequency oscillator with a period from seconds to the frequency of hundreds of hertz, possible digital frequency counter, which serves as a precise indicator, but we will also talk attenuators, amplifiers, driving circtuits or a power circuit. Possible equations, schematics/circuits and their improvements can be found here through simulators Falstad (ideal circuits) and LTspice (real ciruits), also graphs, sheets, calculations. In the end there is also a short description of the two famous tremolo effects from BOSS and Schaller manufacturers. The design was constructed on breadboard, measured into the protocol and experimentally tested using soundcard. Based on those measurements, a model laboratory task for students has been made.
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Laboratory exercises for network technologies education
Kapusta, Martin ; Langhammer, Lukáš (referee) ; Dvořák, Jan (advisor)
The aim of the diploma thesis is to choose network simulator suitable for network technologies laboratory tasks for educational use. Theoretical part of thesis describes basics of network communication, addressing, reference models. Thesis also describes standards Wi Fi, Ethernet and routing protocol OSPF - technologies which are discussed in laboratory tasks. The practical part of diploma thesis describes a few available network simulators suitable for creating two laboratory tasks. Finally, the NS-3 simulator was chosen. Both laboratory tasks include theoretical introduction, detailed description of source code, individual tasks, expected outputs and control questions which senses understanding of discussed technologies.
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Family house, Hamry nad Sázavou
Dvořák, Jan ; Chuchma, Lukáš (referee) ; Klimešová, Jarmila (advisor)
The bachelor´s thesis The family house in Hamry nad Sázavou is processed as a project documentation. The proposed building structure is located in Hamry nad Sázavou. It is a detached house with three floors, a basement floor and a garage. This building construction is based on the strip footings. The load- bearing walls and partition walls are bricked up by Porotherm blocks. The ceilings are made up of ceramic beams POT and brick inserts Miako. The roof structure is designed as a wooden shad. The ground floor and the second floor is used for living. The basement is designed for as a storeroom, gym, playroom, technological room and a garage. The natural lighting is provided by wooden windows. The heating is ensured by a combination of a gas boiler and a fireplace. The disposition study and the seminar works are attached as a part of this project.
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Pseudo-differential fractal-order frequency filters
Alkanan, Mohamad ; Dvořák, Jan (referee) ; Sládok, Ondřej (advisor)
This bachelor´s thesis deals with pseudo-differential frequency filters of fractal order. It is a proposal of non-integer order (1 + ) of pseudo-difference filter. The introduction to the theory describes the basic properties of frequency filters, their type and use. The following is a description of pseudo-differential and differential filters. The next part of the text is devoted to filters of non-integer order. Then there is a description of the current conveyors used (UCC, DVCC and DDCC). The next part of the work is devoted to the design, which is a pseudo-differential frequency filter of fractal order (1 + ) and its subsequent mathematical description in the SNAP program. The functionality and correct behavior of the filter were verified by simulations in OrCAD. The last part of the work is devoted to the practical measurement of the filter.
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