|
|
Vyhodnocování relačních dotazů v proudově orientovaném prostředí
Kikta, Marcel ; Bednárek, David (advisor) ; Černý, Tomáš (referee)
This thesis deals with the design and implementation of an optimizer and a transformer of relational queries. Firstly, the thesis describes the theory of the relational query compilers. Secondly, we present the data structures and algorithms used in the implemented tool. Finally, the important implementation details of the developed tool are discussed. Part of the thesis is the selection of used relational algebra operators and design of an appropriate input. Input of the implemented software is a query written in a XML file in the form of relational algebra. Query is optimized and transformed into physical plan which will be executed in the parallelization framework Bobox. Developed compiler outputs physical plan written in the Bobolang language, which serves as an input for the Bobox. Powered by TCPDF (www.tcpdf.org)
|
|
|
Erasmus as a means of strengthening European identity: case study of the Czech Republic
Černý, Tomáš ; Kasáková, Zuzana (advisor) ; Rovná, Lenka (referee)
This paper deals with the question as to whether there is a correlation between an Erasmus sojourn and European identity. It is assumed by many EU politicians that through the experience of studying and living in another European country, students develop a feeling of community with other Europeans. In spite of such believes, there is lack of conclusive empirical evidence, as some authors argue Erasmus is an effective instrument for promoting European identity, while others do not. Moreover, the effect of an Erasmus stay seems to be affected by factors such as host country and nationality. By analyzing a quantitative survey carried out with Czech Erasmus students, this thesis suggests that, while dependent on various variables, Erasmus can bring about a positive change within European identity.
|
|
|
Right to challenge
Černý, Tomáš ; Kysela, Jan (advisor) ; Urban, Michal (referee)
This thesis aims to give a reflection on the doctrine of the right of resistance in the Czech Republic, its liberal democratic system and legal order. The first part of the thesis presents a short description of the background and the development of the doctrine. It also deals with Article 23 of the Charter of Fundamental Rights and Basic Freedoms as an attempt of embedment the right of resistance in the Czech law. The subject matter of the second part are the transformation processes taking place in the current world that have an impact and threaten liberal democracies including the Czech Republic. This part also gives examples of the application of right of resistance. The first chapter contains a short historical and a modern definition of the right of resistance. It also defines the following related notions - the revolution, the coup d'état and civil disobedience, that this thesis applies. The second chapter focuses on the history of the right of resistance. It goes back to its roots in Ancient Israel, looks upon the Enlightment authors dealing with the theory of Social contract and concludes with the post-war development. Special focus is turned to the disputed aspects of the right of resistance. The third section deals with possible interpretations of Article 23 of the Charter of Fundamental...
|
|
|
Position of Airpower in Contemporary Strategy
Černý, Tomáš ; Střítecký, Vít (advisor) ; Ludvík, Jan (referee)
This thesis deals with the current role of airpower in contemporary warfare. In last 100 years, the aircraft became an indisputable part of today's armed conflict. The aim of this work is to determine the mechanics behind airpower's functions in conflicts and to critically assess airpower's performance. The analyzed conflicts - Persian Gulf 1991, Kosovo 1999, Afghanistan 2001 and U. S.-led counterinsurgency campaigns in Iraq and Afghanistan - provide the diversity that is needed to reveal the position of airpower in contemporary strategy. The thesis is divided in three parts. The first part follows the evolution of airpower and its theory, providing context to further analysis of contemporary environment. The second part of the thesis identifies key theoretical concepts and modalities connected to airpower and analysis them on a general, theoretical basis. The third part of this thesis applies the concepts and modalities on the picked case studies in order to reach the suggested objectives by analyzing the conflicts and deriving empirical data. The conclusions of the thesis suggest that while slightly exaggerated, airpower grew to vital importance and became one of the key elements in today's conflicts.
|
|
|
Biotopes associated with migration corridor valley of the Tichá Orlice river (Eastern Bohemia, Czech Republic)
Rejzek, Tomáš ; Kovář, Pavel (advisor) ; Černý, Tomáš (referee)
Biotopes associated with railway corridor in valley of the river Tichá Orlice (Eastern Bohemia, Czech Republic) ABSTRACT Expansion, invasion or decline of plant species caused by environmental changes belong to the most important phenomenons associated with vegetation cover development. In spite of their often initiation by human activities the above mentioned processes continue then spontaneously and uncontrollably. This study is concentrated to the effect of these mechanisms on the biotope structure along the Tichá Orlice River (Eastern Bohemia, Czech Republic) - in its lowland landscape segment of the canyon character where the second axis of the valley (river flow is the first one) is created by railway line more than 150 years of local history. The case study has the general aim: to treat the present and/or future impact of described trends to plant biota and the degree of its influencing. My diploma thesis investigates functional impact and mutual interaction of the two main migration pathways of exotic species - the T.Orlice river and the railway corridor. It presents qualitative and quantitative changes in plant components of local (semi)natural biotopes by mean of interrelationships among selected ecological groups of species (neophytes, expansive species, and ephemeroids). At the same time, this...
|
|
|
Hydraulic cylinder
Černý, Tomáš ; Kozák, Jiří (referee) ; Klas, Roman (advisor)
Bachelor thesis contains a brief description of the principle of operation of hydraulic motors, their use and computational relations. The main part of the research is devoted to hydraulic cylinders, their principle of function, division and construction. Also, a space for calculating the buckling stiffness of the piston rod is given. The next part deals with mathematical modeling of hydraulic mechanisms. A simple mathematical model is created in the case of a hydraulic cylinder with two identical piston rods and in the case of a differential piston. Based on the model, graphs of the frequency of oscillation are plotted. The possibilities of influencing the frequency of oscillating are explained by changing the parameters of the cylinder.
|
|
|
Phytogeographical analysis of distribution of selected xero-thermophilous herbaceous taxa along the Sázava River valley in Central Bohemia
Vlasák, Tomáš ; Černý, Tomáš (advisor) ; Boublík, Karel (referee)
This study is focused on a phytogeographic analysis of the distribution of selected xero thermophilous herb taxa along the Sázava Canyon in Central Bohemia. The research was done in 62 localities scattered along the major river stretch from Ledeč nad Sázavou to the confluence of Sázava with the Vltava Riever. The Sázava River was divided according to the river mileage into 8 even sections where there were 6 or 7 larger representative localities further selected. In each locality there was obtained the semi quantitative floristic inventory of species according to a pre prepared check in list with 57 taxa, further a detailed exploration of the locality was performed including the measurement of the area (in ha), direct perpendicular distance to the Sázava riverbed (in km), distance of the locality related to the river mileage, proportion of slopes of southern expositions, by means of conservative method using paper maps, calculation of the coefficient of variation of local altitudes (i.e. the assessment of vertical complexity), reading of geographical coordinates by tourist GPS receiver and finally a detailed determination of bedrock types at individual localities. The results were processed and then statistically evaluated in the program CANOCO software for multivariate analyses. The CANOCO program calculated that the influence of species composition in the given areas describes approximately 8.6 % of the total variability of individual species. This influence is proven to be statistically significant on the alpha level = 5%. The analysis, using observed data, calculated that 28.9 % of total variability of the vegetation composition in the studied floristic areas is influenced by the chosen variables. This work may serve as a comprehensive resource of the sites for future research, also it brings a valuable floristic data for the nature conservation purposes.
|
|
|
Correlation analysis among the distribution of forest vegetation zones, selected climatological parameters and actual vegetation status in Hostýn-Vsetín Mountains subregion of natural forest region 41
Pšenko, Martin ; Černý, Tomáš (advisor) ; Ulbrichová, Iva (referee)
Hostýnské mountains are part of the most frequently visited forests in Moravia. Whether because of the numerous cottage and recreational areas with abundant occurrence of fungi, these forests were subject to great anthropogenic influence since its origin. Therefore, it was created on the territory of several protected areas and nature reserves, which were designed to preserve the natural vegetation potential of local vegetation and protection of rare species of local phytomass and zoomass. The goal of this thesis is the verification of the respective forest vegetation zones of the investigated plots, which had been historically assigned in several respects. In the past, namely the allocation of forest vegetation zone was entirely an empirical matter, which scientists have not been able to verify the correctness of his judgment by means of statistical analysis, as is the case nowadays. The plots were therefore selected to characterize best the local conditions, whether in terms of species composition of vegetation or climatic conditions. On the 20 selected plots there were collected data within individual tree layers (based on Kraft-Zlatník scale), species composition and level of development of individual trees by circuits measured at breast height and height measurements according to average individuals. As additional data for the overall evaluation were used climatological maps using GIS software creating a mosaics from which it can be acknowledged how much of the forest stands is affected by abiotic factors such as the length of the snow or the average air temperature. The data assembling the complete image of the plot characteristics were subsequently analysed by regression and multivariete statistical analysis. The obtained results show the context between the actual stage of the forest stands and the used climatic parameters. I believe that this work could be a model for those who do not rely on empiricallly-derived forestry maps and admit that the overall climate in our country is changing and evolving. It is therefore important to consider these causes not only for the purposes of forest management, but also for the protection of existing vegetation.
|
|
|
Influence of understory light on diversity and composition of forest vegetation in the České Středohoří Mts.
Macek, Martin ; Kopecký, Martin (advisor) ; Černý, Tomáš (referee)
Light is essential component of forest ecosystem, as limited light availability in forest-floor restricts herb and tree seedlings growth. Importance of light availability for maintaining plant species diversity and community structure wasn't sufficiently evaluated in the Czech Republic. This study focus on the ecological relevance of light availability on both landscape and local scale. Relationship of light to cover, diversity and species composition was quantified in the thesis. Dominant tree species affected light availability and its spatial variability. Light availability was along the soil reaction and slope most influential factor for large-scale species diversity. Within-site light variability affected plant diversity more than soil reaction variability. Measuring light by means of hemispherical photography seems to be an appropriate for studies like this. Light availability influnence on community compostition is weak in comparison with other environmental gradients.
|
|
| |
guest ::
RSS feed.