National Repository of Grey Literature 132 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
Recovering daily keys for Enigma
Kubániová, Dominika ; Tůma, Jiří (advisor) ; Žemlička, Jan (referee)
During the second world war the ability to read enemy's encrypted messages was important to defence own territory and even to quicken the end of the war. One of the encrypting machines was german Enigma, whose seizing did not yet mean any success of decryption since the number of all possible settings for one day was a number exceeding trillions. In the pre-war and war years the breaking of Enigma was led by the best polish and british mathematicians, while they had to strictly keep their achievements secret, even decades years after the war. The aim of my bachelor thesis is to create a mathematical model of Enigma and to reconstruct its procedures for discovering daily keys with emphasis on their mathematical substantiation. 1
Discrete linear dynamical systems with control
Procházková, Zuzana ; Tůma, Jiří (advisor) ; Růžička, Pavel (referee)
Discrete linear dynamical systems with control Author: Zuzana Procházková Department: Department of Algebra Supervisor: doc. RNDr. Jiří Tůma, DrSc., Department of Algebra Abstract: In this thesis we describe elementary property of discrete linear dyna- mical system. We define discrete linear dynamical system with control and its controllability and then we define descrete linear dynamical system with output and its observability. After that we show the duality of observability and con- trollability with definition of dual system and its description. There are three problems solved in the last chapter. 1
Line for manufacturing parts for car engine volume thermoforming
Smola, Jiří ; Tůma, Jiří (referee) ; Omes, Jiří (advisor)
The aim of this diploma thesis is to design valve production line for combustion engines by volume forming with heat. The production of line will be 2 500 000-10 000 000 pieces per year. In the introduction of this thesis are described production technologies. Next part is about design of production lines and description of each machine for each technology. Then are made the basic calculations for designe for each machine.
Design and analysis of the cross table
Zemčík, Matěj ; Pavlík, Jan (referee) ; Tůma, Jiří (advisor)
This thesis deals with the design of the cross table. That is, designing a linear guide, a ball screw and a motor. In addition, dynamic simulations are used in the MSC Adams for machining cycle and the positioning cycle of the semi-product at rapid traverse. As a simulation output are the „real“ load patterns of the bearings in the placing of the ball screws and the durability of these bearings.
Design of composite isolator winder
Menšík, Martin ; Tůma, Zdeněk (referee) ; Tůma, Jiří (advisor)
The aim of this master thesis is the construction of a single-purpose machine used for reeling of composite insulator. In the first part is described the technology of reeling completed by the analysis of used components. Based on the findings, the final constructional version with necessary calculations is stated. The result of this thesis is a 3D model of the chosen design together with drawings and calculations of given parts.
Mechanical securing of hydraulic lifting systems for stage technology
Drha, Vojtěch ; Tůma, Jiří (referee) ; Pavlík, Jan (advisor)
The aim of this thesis is to design a mechanical position securing of hydraulic elevating systems for stage technology. The first part includes an overview of present state of elevating systems and their securing solutions. The second part determines technical parameters and design of a chosen solution together with control and design calculations. Final part analyses suggested solution in terms of security.
Side channel attack in cryptanalysis of symmetri and asymmetric schemes
Hlaváč, Martin ; Rosa, Tomáš (advisor) ; Klíma, Vlastimil (referee) ; Tůma, Jiří (referee)
The work summarizes author's three main results during the doctoral studies published at SAC '06 and CHES '09 conferences and the journal IET Information Security. The first two results are the side channel attacks on asymmetric schemes RSA and DSA. They are both based on the theory of lattices and are motivated by modern technologies such as Intel Pentium 4 HTT processor and the electronic passport. The last result is more technology related. It describes the method that provides optical side information and that was empoyed for the first time for the cryptanalytic purposes by the author. As an application, an attack on symmetric cipher AES running on a simple and widespread microcontroller PIC16F84A is presented.
Moving bolster of body panel press
Novotný, Lukáš ; Tůma, Jiří (referee) ; Omes, Jiří (advisor)
This Master thesis deals with design structures of moving bolster for body panel press and with design of railroad tracks, in which the bolster is moving in two mutually perpendicular directions. These moving bolsters are used for facilitating and speeding up the change of pressing dies, which is desirable in automated automotive industry for shortening and streamlining the pressing die change. The part of the work is research of the current state of knowledge in systems for quick die change, design of the moving bolster and its drive, design of railroad tracks, amount of design and control calculations, design of mechanism for lifting the bolster, optimization and strength calculations of bolster in ANSYS software. All the design structures of bolster, railroad tracks and basic workplace layout are processed in 3D software for modelling Autodesk Inventor. Attachments consist of drawing documentation of main assemblies, namely mounting drawing of moving bolster assembly, mounting drawing of railroad tracks assembly, drawing of workplace layout and furthermore drawing of driven shaft, weldment and workpiece of moving bolster and railroad tracks block.
Design of working arm for threading machine
Řezníček, Marek ; Tůma, Jiří (referee) ; Pavlík, Jan (advisor)
The aim of this work is to propose the construction of working arm threading / drilling. Working arm provides "its" vertical position of the tool axis in the working range and reduces the force effect of cutting forces and weight. The work includes 3D models and drawings, including the calculation of the components.
Design of tool magazine for CNC mill
Sýkora, Michal ; Tůma, Zdeněk (referee) ; Tůma, Jiří (advisor)
This bachelor thesis deals with automatic tools change on machine-tools. In the thesis, there is a research from the issue of ATC on machine-tools, focused on individual types of tool magazines. Then the necessary construction calculations are made there. Based on the calculations, the disk-type magazine is designed in 3D software. Assembly drawings and production drawings of three components are also part of the bachelor thesis.

National Repository of Grey Literature : 132 records found   1 - 10nextend  jump to record:
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