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Design of a micromanipulator for repairs of printed circuit boards
Kopřiva, Pavel ; Skácel, Josef (referee) ; Otáhal, Alexandr (advisor)
This thesis deals with design and construction of micromanipulator based on pantographic mechanism with electronic control. The theoretical part presents possible principles of construction and control of micromanipulators. The practical part contains design of the pantographic mechanism. Furthermore, stepper motor based electrical drive section was designed and appropriate control circuits and power supply were selected. Finally, the micromanipulator was constructed.
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Business Process Mining
Skácel, Jan ; Kreslíková, Jitka (referee) ; Bartík, Vladimír (advisor)
This thesis explains business process mining and it's principles. A substantial part is devoted to the problems of process discovery. Further, based on the analysis of specific manufacturing process are proposed three methods that are trying to identify shortcomings in the process. First discovers the manufacturing process and renders it into a graph. The second method uses simulator of production history to obtain products that may caused delays in the process. Acquired data are used to mine frequent itemsets. The third method tries to predict processing time on the selected workplace using asociation rules. Last two mentioned methods employ an algorithm Frequent Pattern Growth. The knowledge obtained from this thesis improve efficiency of the manufacturing process and enables better production planning.
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The gas monitoring equipment in breeding of edible insects
Chlumecký, Karel ; Skácel, Josef (referee) ; Adámek, Martin (advisor)
Bachelor’s thesis deals with monitoring of edible insects. The most monitured element will be dangerous gases. In the first part will be discussed the life cycle of edible insects and associated ecological consequences. Another part is description of measuring non-electric variables. This knowledge will be useful in design of breeding box in practical part of bachelor’s thesis. Design contains selections and description of used components and their locations on breeding box. Breeding box is managed by microcontroller ESP32 from Espressif family. Practical part contains first results of measuring and program for microcontroller. The results are in the form of a graph. Breeding box can be used for most terrarium animals.
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Systems of Parallel Grammars
Skácel, Jiří ; Horáček, Petr (referee) ; Meduna, Alexandr (advisor)
This article defines cooperating distributed grammar systems with E0L components instead of context-free grammars and discusses its generative power mainly in respect to ET0L systems. It recapitulates results about CD GS, then defines modified systems and shows that this combination has in most derivative modes equal strength to ET0L, except for terminating mode, which is shown to be more powerful. There are also explained examples of this new kind of systems.
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Optimization of fabrication technology and defect detection for ceramics structures
Chyťa, Filip ; Otáhal, Alexandr (referee) ; Skácel, Josef (advisor)
This work deals with the problems of defects in ceramics structures and packages, their detection and subsequent optimization of the manufacturing process in order to eliminate these defects. The first chapter summarizes ceramic materials in elec-trical engineering and deals specifically with Al2O3 and material GRANNALOX 9620 F and optimization of its production profile. The second chapter deals with preparation of the ceramic powder and its subsequent processing. The third chap-ter deals with detection of defects in the thus formed ceramic packages, testing their electrical, thermal and mechanical makings. In the next chapter I deal with my workflow, which I used in the production of packages, the way of production and testing of packages, including comparison of their makings.
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Optimization of the switching power supplies with synchronous rectifier
Skácel, Josef ; Macháň, Ladislav (referee) ; Žák, Jaromír (advisor)
This thesis deals with switching circuit topic, especially switching power supplies. There are switching circuits without inductance and their benefits presented in the thesis. Basic topologies of switching power supplies, their properties, application area and functions of basic types of converters are also described. The next section focuses on special resonant switching power supplies and synchronous. The main part of the work is carried out simulations using three synchronous rectifiers. The work includes practical design of an SMPS with synchronous rectifier.
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Drone construction for use in sensor technology made by 3D printing
Česák, Radim ; Skácel, Josef (referee) ; Adámek, Martin (advisor)
Goal of this term paper based od informaion gained from the internet was to design construction and then make drone with help of -3D printer, which will be used in sensor technology. In the first part term paper deals with familiarizing with problems that come with choosing parts and creating the frame in free 3-D modeling program. Second part of this work deals with practical construction of the drone, programming of its flight controller, which is ESP32 DevKit v1 and its testing.
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Purchase process standardization
Skácel, Jakub ; Kotek, Luboš (referee) ; Kotek, Luboš (referee) ; Fiala, Alois (advisor)
This master's thesis is engaged in standardization of relation between costumer and supplier from perspective of purchasing products in the automotive industry. In this thesis are specified requirements at the suppliers of plastic parts. The costumer is Robert Bosch České Budějovice (RBCB). By standardization we understand selection and description of customer’s requirements at supplier.
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Design of magnetoplanar headphones with amplifier
Chyťa, Filip ; Búran, Martin (referee) ; Skácel, Josef (advisor)
This work deals with comparison of individual types of electroacoustic transducers, their properties and practical use. Furthermore, design and manufacture of a magnetoplanar transducer, its integration into headphones and the production of headphone amplifier. The first chapter summarizes all types of electroacoustic transducers, their properties, advantages, disadvantages, and their use in practice. The second chapter deals with the classes of amplifiers. The third chapter deals with the choice of design of a magnetoplanar transducer, headphones, and selected type of headphone amplifier. The last chapter describes the production process of individual parts of the headphones, transducer and amplifier, including the final measurement.
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