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Strain stress analysis of proximal femur with dynamic hip plate
Kohoutek, Jan ; Valášek, Jiří (referee) ; Florian, Zdeněk (advisor)
The presented Master’s Thesis aims at determining stress and strain distribution in proximal femur with applied PCCP and DHS systems. The DHS system has been widely and successfully used for treating intertrochanteric fractures of proximal femur; in some cases, however, complications concerning implant cut-out and excessive fracture collapse occur. To minimize the risk of stabilization failure, the PCCP system was designed. In the Thesis, the process of creating the numerical model is described and the results obtained by employing Finite Element Method are presented. The 3D models of implants’ geometry were created based on the real objects. The model of proximal femur geometry was built by utilizing a series of CT scans and divided into two bodies with respect to the AO classification afterwards. The loading was obtained by solving the static equilibrium equations for the loose lower extremity. The computation was run in Ansys Workbench v13 software. In the hip screws of the PCCP system, lower values of equivalent stress can be found when compared to the DHS system. However, the equivalent strain generated in the proximal fragment is 3-times higher when the PCCP system is employed than in case of DHS system which may be due to the self-cutting design of PCCP screws. By employing PCCP system, the risk of implant failure is decreased. On the other hand, the bone tissue of the proximal fragment in close vicinity of the implant screws seems to be overloaded and prone to collapse.
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FM Transmitter on Rasberry Pi
Kohoutek, Jan ; Bidlo, Michal (referee) ; Vašíček, Zdeněk (advisor)
Aim of this bachelor thesis is to desing and implement player, which will be able to play its own files in FM band. The player consists of transmitter based on Rapsberry Pi and mobile application that allows wireless control of this player. Technical report is divided into three main parts. The initial part describes technologies for transmission of audio signal in FM band. Followed by description of suggested solution and its implementation. Concluding part describes the designed prototype and assesment of its parameters.
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Simulation of Sound Field of Multiple Sound Sources
Kohoutek, Jan ; Kurc, David (referee) ; Schimmel, Jiří (advisor)
The main task of this bachelor thesis is description of interaction of sound waves in field. To understand the whole topic important physical laws related to sound waves propagation are defined. It also deals with frequency and directional response of ideal point source which compares with real measured responses of direct-radiating electrodynamic loudpeaker. Thesis are shown some examples of sound fields on which are specified their behavior. It also desribe main properties for right functionality of line-array source. In practical part are measured acoustic pressure values which lead to creating a interpolation map of sound pressure level. This obtained map was compared with theoretical acoustic field. Part of this bachelor thesis is program which enable to simulate acoustic field created under variable sound and environment properties.
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Location Estimation of Objects in WiFi Communication Network
Kohoutek, Jan ; Strnadel, Josef (referee) ; Šimek, Václav (advisor)
The purpose of the thesis is to design and physically implement a system for location of devices in a Wi-Fi based networks deployed in the interior of small and medium-sized enterprises. First of all, the attention is given to the survey of commonly available technologies suitable for determination of the object position. Then, based on these findings, architecture of a location system comprising an array of sensor nodes and central processing unit is proposed. In conclusion, the results are presented and the fulfillment of the requirements is evaluated.
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Design of communication network at a company headquarter
Kohoutek, Jan ; Sedlák, Petr (referee) ; Novotný, Vít (advisor)
The bachelor's thesis focuses on the design of a communication infrastructure project for a company building. There are production, storage and administrative premises, including Open Office space for rent. The basic documents for the work are the requirements of the investor and the floor plans of individual parts of the building. The result is an analysis, a proposal for the selection of individual components of the communication infrastructure, project documentation and, at the very end, an economic evaluation.
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Location Estimation of Objects in WiFi Communication Network
Kohoutek, Jan ; Strnadel, Josef (referee) ; Šimek, Václav (advisor)
The purpose of the thesis is to design and physically implement a system for location of devices in a Wi-Fi based networks deployed in the interior of small and medium-sized enterprises. First of all, the attention is given to the survey of commonly available technologies suitable for determination of the object position. Then, based on these findings, architecture of a location system comprising an array of sensor nodes and central processing unit is proposed. In conclusion, the results are presented and the fulfillment of the requirements is evaluated.
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Creating geometrical models of selected implants of hip joint
Kohoutek, Jan ; Vosynek, Petr (referee) ; Návrat, Tomáš (advisor)
According to the specification, the concept of the thesis is a research study, which is supposed to present global overview of the hip joint arthroplasty. It involves a short summary of basic methods used in biomechanical measurements of bone tissue and provides a comparison among isotropic homogeneous, isotropic inhomogeneous and orthotropic inhomogeneous material models and their impact on the results of the stress-strain analyses. In the thesis, there is also a short list of popular implants used in present times as well as a few examples of creating geometrical models of some prosthesis.
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Equalising opportunities for pupils in the Czech educational system through the work of social pedagogues, social workers and other street-level bureaucrats.
Halaštová, Eliška ; Pýchová, Silvie (advisor) ; Kohoutek, Jan (referee)
This thesis discusses the possibilities of support for socially disadvantaged pupils in Czech primary schools by street-level bureaucrats in order to equalise their educational opportunities. Using a questionnaire survey, the thesis searches answers to the questions of what the support of disadvantaged pupils in Czech schools looks like, what organisational placement of street-level bureaucrats within the system can be effective for such support, and what support is appropriate for street-level bureaucrats themselves to perform their role well. The sub-results of the thesis are then claims that social pedagogues and social workers in schools, as well as social and other service workers outside schools, perceive support for disadvantaged pupils as part of their work and strive for it. A model of support inside and outside schools and effective collaboration between these actors therefore appears ideal. The fulfilment of the common goal of street-level bureauctrats is often hampered by inadequate working conditions, which should be systematically improved in order to improve the quality of line workers' work.
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Abolition of Super-Gross Wage in the Czech Republic through the lens of the Multiple Streams Framework
Kalina, Martin ; Ochrana, František (advisor) ; Kohoutek, Jan (referee)
In general, the changes in the area of taxation do not represent anything exceptional. But sometimes a change comes along that leaves a more significant mark on people's minds as the super-gross wage did. It came into being in 2008, as part of the reform of public finance of that time. Despite numerous attempts and efforts to cancel it, it lasted for 13 years. It was finally cancelled at the end of 2020 amid the COVID-19 epidemic. The final thesis, therefore, focuses on its definitive abolition. The aim of the diploma thesis is to examine the abolition of super-gross wage from the point of view of public policy and to understand the process of the abolition of super-gross wage in the Czech Republic with regard to both the policy stage of agenda setting and the policy stage of decision making. The thesis looks at the research problem through the lens of the multiple streams framework. It is conceived as a qualitative case study, where the data represent media outputs that are analysed using thematic analysis.
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