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Stress tester
Charvát, Ondřej ; Martinásek, Zdeněk (referee) ; Zeman, Václav (advisor)
The diploma thesis deals with network infrastructure load testing. It’s target is to design and implement a network probe which will be in a form of JMeter plugin one of the components in load tester project. It offers sufficient theoretical basis about load testing, analyzes different types of DoS which can be used to stress the tested infrastructure and also discusses some solutions for load testing realization used in practice. Following is a study of possible ways for realization of the probe with help of several open-source tools. The suitability of individual tools is evaluated from the point of view of the network probe requirements and then the most suitable ones are selected as the basis for it’s implementation. Then, a network probe design is constructed in which it’s functionality is divided into two separated plug-ins, a network probe itself and a server emulator, and the implementation phase is commenced. The implementation is done in Java programming language to allow the new components to use all the neccessary JMeter API functions. The structure of individual parts of the modules as well as many implementation details are analyzed thoroughly in the text. The final chapter of the thesis describes function of the newly created components. After their installation into the load tester the procedure and the results of the functional testing are presented. This thesis describes the whole process of developing a plug-in for JMeter software.
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Possibilities of QoS algorithms simulation and optimization
Charvát, Ondřej ; Číka, Petr (referee) ; Krajsa, Ondřej (advisor)
The bachelor's thesis deals with problematics of data transmission control in converged networks which is implemented there to offer telecommunication services in desired quality. Theoretical part of the thesis provides an overview of measurable parameters and lists factors by which they are affected. It discusses different levels of services offered and finally techniques used for it's provisioning as they are implemented in network appliances. In practical part a model of network with QoS implementation is constructed in simulation software Simulink. There are several traffic flows running in the simulated network which has different demands on transfer quality such as telephony or bulky file transfer. There is graphical user interface programmed in Matlab enviroment by which it is possible to alter QoS settings in the model and observe effect on achieved parameters of running data transfers. All simulation results are also displayed on the user interface. User may set all parameters manualy or let the software optimize settings according to prefered criterion, i.e. packet loss. In such way model demonstrates how changes in QoS configuratinon affects quality of services being transferred. The whole model is constructed in a way to be easily reconfigured in case of future use. It is possible for expample to add more traffic or to extend the model to larger network by using predefined blocks.
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Analysis of media appeasement in the British press in the 1930s
Charvát, Ondřej ; Valkoun, Jaroslav (advisor) ; Novotný, Lukáš (referee)
The thesis studies the political and journalistic history of Great Britain in the 1930s. The main topic of the thesis is the mapping and subsequent analysis of the British periodical press in the mentioned period. It primarily deals with the so-called media appeasement of the British press in relation to the established foreign policy of Great Britain, the concessions of its leading representatives to Benito Mussoliniʼs fascist Italy, and subsequently to Adolf Hitlerʼs Nazi Germany. Thesis examines differences in the approach of individual periodicals to the presentation of specific foreign-political topics that resonated in the period before the outbreak of the Second World War. The study defines which periodicals tended to government policy and analyses how they did so. It also examines whether British newspapers were inclined towards the mentioned extremist regimes. Special attention is given to British newspaper market and the ties of newspaper houses and owners to the political scene of Great Britain.
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Representation of selected sustainable development indicators in Ceska televize
Škorvagová, Viktorie ; Novák, Arnošt (advisor) ; Charvát, Ondřej (referee)
Presented diploma thesis discusses the process of making environmental claims in the Czech environment and aims to find at least partial explanation for the dominance of GDP as main economic indicator in the public discourse. The work is theoretically framed by the concept of social construction of environmental problems by John Hannigan, in which the media play an essential role. The theoretical part of the thesis presents the theoretical basis of the social constructivist perspective and various aspects of news content production. It also assesses selected claims-makers in the Czech environment and further presents selected concepts of sustainable development indicators. The research of this work is based on a qualitative strategy and is carried out through semi-structured interviews with actors involved in the process of defining, presenting and legitimating environmental issues. The research seeks answers to following research questions: What is the process of claims-making about GDP growth and alternative indicators? How do the individual actors subjectively interpret the process of claims-making in which they are involved, as part of their social reality? The narrations of the actors-informants are then processed and structured into nine categories. Key words Social construction of...
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Real estate price modelling with a focus on location attributes
Charvát, Ondřej ; Polák, Petr (advisor) ; Hejlová, Hana (referee)
The thesis introduces several methods of real estate price modelling suitable either for prediction of the housing prices or for exploring the relationships between the price and its determinants. We compared the conventional linear regression approach to the tree-based methods of machine learning. The comparison analysis on the dataset of 28 019 apartments in Prague suggests that regression trees (especially the Random forest) yield a higher accuracy in the price prediction. Another objective was to examine the effects of location attributes (especially its accessibility and environmental quality) on the prices of nearby apartments. To address the spatial interactions in the geographical data, we employed three spatially conscious models to achieve more reliable results. The local analysis performed with the geographically weighted regression confirmed the presence of spatial heterogeneity and described the price effects relative to the location. In some areas, an increase of 100 meters in distance from the nearest metro station and the nearest park are associated with a decrease in the apartment prices by 644 CZK/m2 and 916 CZK/m2 , respectively. These findings are especially important for the apartments near the stations of the new metro line, which is currently in construction.
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Automatizace importu příjemek do ES Pohoda
Charvát, Ondřej
Charvát, O. The automation import of receipt cards to ES Pohoda. Diploma thesis. Brno: Mendel University, 2017. The diploma thesis deals with design and implementation of application to auto-mation import to ES Pohoda. In the theoretical part is introduced automation, economic system Pohoda and company for which the solution was processed. The thesis also analyses the current state of the issue within the company and outside. The practical part of the thesis deals with requirements analysis, design, imple-mentation and testing of the application. In this part are closer introduced the technologies used in the development. In the conclusion of the thesis is appli-cation critically assessed and possible improvements are suggested.
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Economic and Ethical Impacts of Immigration
Charvát, Ondřej ; Cahlík, Tomáš (advisor) ; Chorna, Olena (referee)
This thesis analyses the relationship between immigration and native employment rate based on the similarity of the educational attainment and age of immigrants and native-born population. The results of this thesis are in line with recent studies suggesting an increase in native employment by 0.44 % in event of an increase in the share of immigrants by 1 %.
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Stress tester
Charvát, Ondřej ; Martinásek, Zdeněk (referee) ; Zeman, Václav (advisor)
The diploma thesis deals with network infrastructure load testing. It’s target is to design and implement a network probe which will be in a form of JMeter plugin one of the components in load tester project. It offers sufficient theoretical basis about load testing, analyzes different types of DoS which can be used to stress the tested infrastructure and also discusses some solutions for load testing realization used in practice. Following is a study of possible ways for realization of the probe with help of several open-source tools. The suitability of individual tools is evaluated from the point of view of the network probe requirements and then the most suitable ones are selected as the basis for it’s implementation. Then, a network probe design is constructed in which it’s functionality is divided into two separated plug-ins, a network probe itself and a server emulator, and the implementation phase is commenced. The implementation is done in Java programming language to allow the new components to use all the neccessary JMeter API functions. The structure of individual parts of the modules as well as many implementation details are analyzed thoroughly in the text. The final chapter of the thesis describes function of the newly created components. After their installation into the load tester the procedure and the results of the functional testing are presented. This thesis describes the whole process of developing a plug-in for JMeter software.
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Our country is beautiful today, but tomorrow will be more beautiful. Relation of the theory of socialistic realims to the topic nature and landscape.
Charvát, Ondřej ; Stibral, Karel (advisor) ; Dadejík, Ondřej (referee)
3 ABSTRACT Humankind in its whole being is reflecting an environment by culture and visual art. Different cultural periods value nature and environment differently, what have a strong impact on nature management - some culture periods have a strong feeling for protecting nature for its own value while others see nature just as a source of materials or energy. This relationship is possible to find in art artifacts made during particular culture period. The communistic idea was ruling for almost half of the twentieth century in former Czechoslovakia. And its point of view has strong negative impact on state of nature and environment. As an official style of art socialist realism was approved at the same time. Its main goal was portraying a new communistic world, new communistic society and new communistic man. Aim of this work is to find out how the socialistic realism displays nature and landscape topic in art pieces. In core of this work stays the assumption, that socialistic realism has no value for nature itself, on the contrary it appreciates only it's rebuilding for easier exploitation. Findings are based on study of theoretical art texts and art-pieces from the period 1945 - 1958. Keywords: nature, landscape, aesthetic, art, socialist realism, landscape painting
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