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Production technology for a vacuum pump component
Horák, Adam ; Kalivoda, Milan (referee) ; Zemčík, Oskar (advisor)
The bachelor's thesis focuses on the design of a new or alternative technology for the component of the orbital scroll wheel 10i for the vacuum pump nXDS10i. The component is made of an aluminum alloy. The aim is to transition to a higher level of automation compared to the original technology, with the implementation of High-Speed Cutting (HSC) machining. The thesis includes an introduction and analysis of the component, including information about the alloy used, an analysis of the original technology, and its variants for optimization. This is followed by the proposal of a new technology and automation design, meeting the conditions set by the manufacturer of the component. The proposal of the new technology includes the design of a new technological process and clamping method. The thesis also includes a technical and economic evaluation of the original technology, the optimized original technology, and the new technology.
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Aproximace doby výpočtu distribuovaných úloh pro lámání hesel
Jadrná, Lucie ; Horák, Adam (referee) ; Hranický, Radek (advisor)
This thesis focuses on improving the accuracy of password cracking time estimation in the distributed system Fitcrack. Based on the analysis of the current solution, key factors influencing the accuracy of computation were identified, and a set of algorithms was proposed to refine the estimation. Conducted experiments confirmed the effectiveness of the proposed algorithms, with the new solution bringing significant improvement in the accuracy of cracking time estimation in 90.32 % of measured tasks, including brute-force attack, dictionary attack, combination attack and hybrid attacks.
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Automated planning of password cracking tasks
Brandšteter, David ; Horák, Adam (referee) ; Hranický, Radek (advisor)
This thesis aims to design and implement an extension module for the Fitcrack system. The extension is meant to help the user who is time-limited and can’t or is unable to estimate the duration of the attack. The extension is also helpful for the user who does not want to spend time setting up individual attacks. It is an automated scheduler that, based on a given time, creates several attacks, whose duration will correspond to the time required by the user. The planner’s output is a prepared set of attacks in the form of a batch, ready for use. Later in this thesis, there are described experiments that were used to verify the applicability of the solution.
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Optimalizace vysoce náročných úloh v systému Fitcrack
Dacík, Ondřej ; Horák, Adam (referee) ; Hranický, Radek (advisor)
The aim of this thesis is to design and implement optimizations for Fitcrack, a distributed password cracking tool. First, a set of computational tasks was created on which computation time and CPU utilization were measured. Problematic areas of the tool were then identified from the results, for which modifications were proposed and implemented to increase the cracking efficiency by a more appropriate task distribution and reduced communication overhead. They concern work with a large number of masks and password mangling rules, optional benchmark skipping and sharing cracked hashes across jobs. The benefit of these changes is finally shown in experiments where the modified version of the tool is compared with the original version. For jobs with a large number of masks, speedups of up to 37 % were achieved, and for the combination of a small dictionary, many rules and computationally intensive hashes, it was possible to reduce the duration of jobs by up to 180 times compared to the original version of the tool.
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The Evaluation of RTK method precision
Horák, Aleš ; Volařík, Tomáš (referee) ; Kuruc, Michal (advisor)
The aim of this diploma thesis was to evaluate a precision of spatial position of chosen services from Czepos and TopNET providers. The chosen services were virtual reference station generated by MAC concept from Czepos provider and virtual reference station NVR3 from TopNET provider. Testing measurement was measured by RTK method with GNSS instrument from Leica System 1200. There were measured long-standing observations which lasts 24 hours and short observations which lasts five and twenty seconds. The short observations were measured at five points in area of Brno. Result of the thesis is comparisons of precisions in position and height.
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Design of an Information System Part for Project Management Support
Horák, Adam ; Stašík, Peter (referee) ; Neuwirth, Bernard (advisor)
This bachelor thesis is aimed at improving the information system of INTERDEKOR s.r.o. based in Horní Těrlicko. The main focus is laid on the ways of easing the process of order evidence that is done by projectants. Firstly, I will get familiar with the TurboCad project environment. Secondly, I will suggest changes that should result in saving the time projectants spend on administrative matters. The above-mentioned changes might enable them to focus fully on their primary work, which is project-making. Last but not the least, I will deal with simplifying the process of price bid creation. This simplification should shorten the time needed for accomplishing this task.
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Phase Changes on Heat Exchanger Surfaces with Hollow Fibers
Kůdelová, Tereza ; Horák, Aleš (referee) ; Dohnal, Mirko (referee) ; Raudenský, Miroslav (advisor)
The thesis focuses on the polymer hollow fibres heat exchangers. The main object of the research is the formation and process of condensation on the outer surface of fibres and the effect of phase change on the heat transfer. The study deals with the influence of the geometry of the heat exchnager on the heat transfer and the condensation process. Fatigue tests of polymeric hollow fibres exchangers are also part of the work. The work provides an overview of the possible use of such heat exchangers in industrial applications associated with condensation.
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Leadership – Manager Skills Analysis
Horák, Aleš ; Hubinková,, Zuzana (referee) ; Franková, Emilie (advisor)
This diploma thesis focus on comparison of the management of 1st half of 20th century with present days. The main goal of thesis is to analyze a lurid career of Czech top manager Domink Cipera, his operation methods and usage of innovative management procedures (that were used during his business and politics career), based on the available published sources. Thesis is in addition comparing Cipera’s management style in context of that era with current acting managers and is concerning with Cipera’s profession heritage and his influence to modern management. Practical section of the thesis is dealing with sociological research on the sample of current acting managers. Design section is describing potential improvement in area of systematical managerial education of managers and executive project employees in the concrete company.
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Airplane Cooling System Optimization
Lajza, Ondřej ; Fiľakovský, Karol (referee) ; Horák, Aleš (referee) ; Píštěk, Antonín (advisor)
Dissertation thesis is focused on the aircraft cooling system optimization. The knowledge of the pressure loss is necessity for design of an optimal system. In the beginning of the thesis, the different designs of piston engine cooling systems are described for both aircrafts and automobiles. Other sections outline the determination of the coolers characteristics and describe the different test sections applicable for the characteristics measurement. The test section built at the Institute of the aerospace engineering is described as well. Practical part of the thesis describes the calibration of the test section. The measurements of the specific coolers were compared with the CFD simulation of two models - the simplified cooler model and cooler element model. Additionally, the measurements were compared with results obtained at specialized coolers testing facility.
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