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Stress and strain analysis of different total knee endoprostheses on tibia bone tissue performance
Boháč, Petr ; Borák, Libor (referee) ; Marcián, Petr (advisor)
This diploma thesis deals with the stress-strain analysis of the influence of various total knee endoprosthesis on the periprosthetic bone tissue of the tibia. The first part of the thesis describes the problem situation and the research study related to the issue. The second part of the thesis describes the basic knowledge suitable for understanding the issues addressed. The third part of the thesis describes in detail the process of creating computational models, which should make the used methodology reproducible for possible further studies. The next part of the work analyses and presents the results of computational modelling using the finite element method. Based on the Frost hypothesis, the effects of various total knee endoprosthesis on the periprosthetic tibial bone tissue at a specified maximum load appearing in the walking cycle are evaluated and compared. At the end of the thesis, the possible consequences of this analysis are mentioned.
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Human Model in Control Systems
Boháč, Petr ; Horák, Karel (referee) ; Havlíková, Marie (advisor)
The aim of this paper is to provide a summary of human models in control systems. I focused mainly on controlling of cars and airplanes. Models based on the PID controller are assessed in aspects of behavior in open loop. I suggest method of determining their parameters using the Nelder-Mead method.
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Design adjustment of vacuum ejector assembly for medical application
Boháč, Petr ; Štefan, David (referee) ; Návrat, Tomáš (advisor)
This bachelor's thesis deals with the design of a two-stage suction ejector for medical use with the working name Medieject II. The proposed modifications are to achieve a reduction in the value of the created vacuum compared to the original value, and thus also enable a more precise regulation of the created vacuum. The first part of the thesis presents the theoretical assumptions, functions and requirements for a multistage suction ejector, which is to serve in a medical environment. The second part describes the analytical calculation of the original variant, which serves as a partial check of subsequent numerical simulations. The third part deals with CFD simulations, which are used as the main solving method for adjustments. Using flow simulations two design modifications and their several partial variants are proposed. Then these modifications are supported by experiment. The second design proposal will be used to manufacture equipment that will fulfill the requirements.
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Simulation models of human operator.
Boháč, Petr ; Horák, Karel (referee) ; Havlíková, Marie (advisor)
This paper deals with simulation models of the human operator controlling lateral position of simulated vehicle. I am comparing parameters and quality of the McRuer human driver model and the PID controller. Simulated system is single-track vehicle model. Simulated driver is tasked to pass a Moose test with this vehicle model. I am using the simulated annealing method to find optimal parameters of the driver model and then I visualize realized test in 2D and 3D visualization. In the end of this paper I compare simulations of the driver models and assess achieved results.
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Application of the DIC method in the analysis of human movement
Vogel, Arnošt ; Boháč, Petr (referee) ; Návrat, Tomáš (advisor)
This bachelor's thesis investigates the potential of using the DIC method for human motion analysis. The research section provides a description of the Digital Image Correlation technique in both 2D and 3D. Moreover, existing methods for analyzing human motion in the field of biomechanics are presented. The practical part of the thesis consists of three initial experiments, where only a few points on the human body were observed. This is followed by a final experiment that examines a more extensive field of points using the DIC method.
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Stress and strain analysis of different total knee endoprostheses on tibia bone tissue performance
Boháč, Petr ; Borák, Libor (referee) ; Marcián, Petr (advisor)
This diploma thesis deals with the stress-strain analysis of the influence of various total knee endoprosthesis on the periprosthetic bone tissue of the tibia. The first part of the thesis describes the problem situation and the research study related to the issue. The second part of the thesis describes the basic knowledge suitable for understanding the issues addressed. The third part of the thesis describes in detail the process of creating computational models, which should make the used methodology reproducible for possible further studies. The next part of the work analyses and presents the results of computational modelling using the finite element method. Based on the Frost hypothesis, the effects of various total knee endoprosthesis on the periprosthetic tibial bone tissue at a specified maximum load appearing in the walking cycle are evaluated and compared. At the end of the thesis, the possible consequences of this analysis are mentioned.
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What is the difference in student knowledge of nutrition at different types of universities?
Boháč, Petr ; Dlouhý, Pavel (advisor)
This diploma thesis consists of a theoretical and analytical part. The first part introduces basic knowledge about healthy nutrition, the constitution of nourishment and nutritional recommendations for citizens of the Czech Republic. It also describes a required level of knowledge about nutrition that all high school students should have. The analytical part is based on research that examined the knowledge of 298 university students and high school seniors. The students were from four different universities and one high school. This set of students was examined by a test that consisted of 30 questions. Students answered another four questions about their weight, height, gender and subjective valuations of their knowledge. The answers to these questions were evaluated manually and processed in programs such as MS Excel, MS Word and Epitable. The diploma thesis examines the knowledge of students based on their school, gender and daily life experience. It also shows students' Body Mass Indexes and differences in their subjective valuations of knowledge based on the students' schools. Results are presented in well-arranged tables in Chapter Discussion. The research showed that the best knowledge is to be found among students from Third Faculty of Medicine. Practical questions that focused on daily life...
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Kolář's mea culpa
Boháč, Petr ; Šrámek, Petr (advisor) ; Brabec, Jiří (referee)
Umělecké dílo je možné nahlédnout z několika perspektiva vždy se ukáže jako jiné a zároveň v jinakosti jako podobné. V této nevyjasněnosti - neklidu - vězí krása díla. A přesto každý interpret, sám za sebe i navzdory dílu samotnému, se musí pokusit najít onen kruciální bod, ze kterého bude dílo nahlíženo. Není důležité, dopracuje-li se k tomuto bodu až postupem čtení, až v samotném rozkrývání jednotlivých složek, nebo jestli díky němu do něj vstupuje, aby jej na konci popřel nebo potvrdil. Slouží mu jako kompas při zbloudění i jako ta část mapy, do níž ještě není zanesena krajina, ta bílá místa, která vábí interpreta k doplnění. V této práci se tímto bodem stane skutečná událost, chápaná ve vztahu k básnické řeči, k realitě, k básníku, jenž nahlíží sebe sama i druhého - ve vztahu ke světu, v němž básník žije, do něhož se projektuje, s kterým se vyrovnává, pro který píše, ale i ke světu jakožto unikátnosti básnické řeči, v níž skutečnost mizí. Nahlížení přes optiku skutečné události vyvrcholí v básni Skutečná událost ze sbírky Prométheova játra, jako v ní vrcholí i básnická tvorba Jiřího Koláře.
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Problematika zavedení Eura v ČR a jeho dopad na podnikový sektor
Boháč, Petra
BOHAC, P., The issue of the introduction of the euro in the Czech Republic and its impact on the business sector. Bachelor thesis. Brno: Mendel University, 2018. The aim of this final bachelor thesis is to quantify the benefits and costs caused by the introduction of the euro in the Czech Republic and how large this implementation affects individual business sectors. Entry into the euroarea gives businesses several benefits but also costs that affect their management. The identification of possible benefits and costs resulting from the introduction of the euro has been developed in similar studies on the effects of the introduction of the euro. The work divides the potential direct benefits that occur immediately after the introduction of the euro and the indirect ones that are here after a certain time, but they may never occur here. Quantification of costs and revenues is created for 2017. This work can be used as a benchmark or recommendation for business decision-making, which of these options would be appropriate for the coming years and would bring to the business sector.
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Design adjustment of vacuum ejector assembly for medical application
Boháč, Petr ; Štefan, David (referee) ; Návrat, Tomáš (advisor)
This bachelor's thesis deals with the design of a two-stage suction ejector for medical use with the working name Medieject II. The proposed modifications are to achieve a reduction in the value of the created vacuum compared to the original value, and thus also enable a more precise regulation of the created vacuum. The first part of the thesis presents the theoretical assumptions, functions and requirements for a multistage suction ejector, which is to serve in a medical environment. The second part describes the analytical calculation of the original variant, which serves as a partial check of subsequent numerical simulations. The third part deals with CFD simulations, which are used as the main solving method for adjustments. Using flow simulations two design modifications and their several partial variants are proposed. Then these modifications are supported by experiment. The second design proposal will be used to manufacture equipment that will fulfill the requirements.
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