The master's thesis covers in its first parts origins and consequnces of the switching losses, basic principles of the various resonant tanks and resonant DC/DC converters. Afterwards the innovative approach of the multiperiod modulation is presented. The main advantages of this kind of modulation include very wide zero current switching region and lowering the switching frequency as the output voltage decreases. In the remaining part of the thesis a prototype converter design is described.

This thesis describes the design and practical realization of a prototype mobile, battery-powered device that is able to periodically recording electrocardiogram and fotopletysmogram or blood pressure. Data from these periodic scanning is processed by microcontroller and stored on a memory card which is part of the proposed device. The device can be connected to a PC via USB like a virtual serial port.

This master’s thesis deals with user influence on miniature antennas in mobile application. Electrically small antennas including fundamental performance properties and limitations are introduced in the theoretical section of this thesis. This section also deals with microstrip antennas and their common types. The accent is on PIFA antennas, their typical constructions and methods of miniaturization. In the practical section, dual-band PIFA antenna for operation at frequencies of systems GSM900 and GSM1800 is designed with the assistance of electromagnetic field simulator CST Microwave Studio. On this type of antenna, the user influence on impedance matching and radiation pattern in data mode (the user is typing message or browsing with the phone) is investigated. For this purpose the hand phantom, corresponding to author’s right hand, was made from agar based material. For typical position of human hand is designed matching network, which eliminate the user influence and ensure correct function of antenna.

This master’s thesis deals with problems of analog differential converters, which are used in measuring circuits working in the current mode. The aim of this thesis is to propose a new voltage to current and current to voltage converter, that should influence measured frequency properties as little as possible. Commercial active elements are use to design converters. Active components are compared on the basis of properties as bandwidth and slew rate. Designed converters are simulated in Orcad PSpice program. Converters, of the best behavior are practically implemented and measured. Measured and simulated values are compared.

This master’s thesis deals with the design of the manipulator for rotating objects, especially workpieces, semifinished products, or complete products around horizontal axis. It’s the manipulator for objects where is needed change orientation during production process. This thesis describes step by step construction of individual components of the manipulator and calculations of propulsive units. At the beginning the conveyor roller with propulsive unit is designed. The next step is construction of scissor lift table and choice of the propulsive unit. There is also made FEM analysis for the scissor mechanism. The next unit is aimed to the construction and computation of rotating and telescopic jaw. Then hydraulic circuit with computation of the propulsive unit is designed. As the final step the appropriate type of sensors are chosen and the step diagram of the manipulator is made. The manipulator is designed in the 3D model program and there are also made some assembly drawings.

The aim of this thesis is to design a conceptual self-propelled forestry winch for removing and skidding in thinning steep terrain. The thesis contains patent search of design solutions the machines using in the field, conceptual design of structural layout, assembly drawing overall concept of the equipment and drawing concept chassis design.

This master's thesis deals with the development of web portal for the application of fault-tolerant methodologies. It introduces the issue of fault-tolerant systems and analyze system requirements, that have users working in this field. It describes the development cycle from analysis and specification of application system design through to implementation and testing part. More thoroughly it is focusing above design portal that provides a comprehensive and versatile solution to the problem that leads to the final implementation of this portal. This realization is part of the thesis.

This master's thesis introduces the Random Boolean Networks as a developmental model in the evolutionary design. The representation of the Random Boolean Networks is described. This representation is combined with an evolutionary algorithm. The genetic operators are described too. The Random Boolean Networks are used as the developmental model for  the evolutionary design of the combinational circuits and the sorting networks. Moreover a representation of the Random Boolean Networks for the design of image filters is introduced. The proposed methods are evaluated in different case-studies. The results of the experiments are discussed together with the potential improvements  and topics of the next research.

This thesis is focused on design of piezoelectric energy harvester with additional nonlinear stiffness. Linear generator has very narrow resonance frequency bandwidth. It makes the resonance mechanism very sensitive to tuning up of the resonance frequency and it can be tuned only for one narrow vibration peak. The main idea for using of the vibration energy harvester with nonlinear stiffness is to make resonance frequency bandwidth wider, so the generator will be useable for more excitation frequencies. In this thesis is used generator Midé V21BL and additional nonlinear stiffness is realized with permanent magnets.

Master´s thesis deals with design of oxy-hydrogen generator power supply for gas welder. Main topic of this thesis is a design of switching mode power supply, which leads to smaller dimensions and weight. Thesis includes design PCB and final measured parameters of this power supply.