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Algorithmic Trading Using Twitter Data
Kříž, Jakub ; Plchot, Oldřich (referee) ; Szőke, Igor (advisor)
This master's thesis describes creation of prediction system. This system predicts future market development based on stock exchange data and twitter messages analysis. Tweets from two different sources are analysed by mood dictionaries or via recurrent neural networks. This analysis results and technical analysis of stock exchange data results are used in multilayer neural network for prediction. A business strategy is created and tested based on results of this prediction. Design and implementation of prediction system is described in this thesis. This system achieved revenue increase more than 25 % of some business strategies by tweets analysis. However this improvement applies for certain data and timeframe.
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Remediation of former In-Situ uranium mining region.
Kříž, Jakub ; Kalous, Jaroslav (referee) ; Jícha, Jaroslav (advisor)
Remediation process of region, formally exploited for chemical leaching of uranium, is based on pumping water contaminated mostly by residuals of sulfuric acid from the relevant geological horizons. The contaminated water is then treated in a chemical plant. In the treatment process evaporators play the key role. Presently operating evaporators – three units – are of falling film type. Heating service is provided by compressed vapor that is generated by evaporators. For driving the compressors and associated circulating pumps of each unit electric power of 3,4 MW is required. In the evaporators treated solution is distributed into individual tubes by nozzles of cyclone type that are mounted at the top end of tubes. In the evaporators feed solution contains calcium sulfide of low concentration. Once the calcium sulfide concentration in the evaporating process reaches the state of saturation, even locally, fouling is initiated. Thus the solids start to grow on the inner surface of the tube wall and the nozzle’s openings become restricted. The evaporator performance – evaporating rate – gradually declines and when it reaches the bottom limit the evaporator has to be shut down. This is followed by carrying out the cleaning procedure. At the time when the evaporators started operating (1996) the period between shut downs lasted around a half a year. However, gradually, this period has become substantially shorter – presently it may even last one week only. The thesis proposes two ways of approaching the present hardly acceptable state. First, replacement of distributing nozzles by a set of properly perforated sieve trays secures the uniform distribution of solution into each individual tube. Second, evaporators’ duty will be taken over by newly build multi-flash concentrator that will substitute the presently operating evaporators. Configuration of this new equipment is derived from widely used multi-flash distillation of sea water. Heat required by the concentrator’s end heaters is drawn from a gas turbine exhaust gas. Steam provided by Heat Recovery Steam Generator is supplied to the condensing heat exchangers installed on the evaporator’s feed stream. Generator coupled to the gas turbine, fueled by natural gas, provides the electric power of 30 MW for export.
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Acquisition of service information from current terminals of GSM and UMTS cell networks, service procedures for mobile terminals
Kříž, Jakub ; Skořepa, Michal (referee) ; Novotný, Vít (advisor)
This thesis concentrates on the UMTS cellular network and the possibilities of its monitoring. There are several methods of monitoring the UMTS. The technique used in this project is based on monitoring through a cellular terminal. The theoretical part is devoted to the description of the UMTS system and the WCDMA technique. The practical part then deals with the method of UMTS monitoring through a cellular terminal and describes in detail individual screens of the FTD (Field Test Display) program, the Netmonitor functions and their parameters. The next part of this thesis analyses the RRC messages, which were recorded during the realization of services (video calls, calls, data transfers) in the UMTS network. The last chapters of the thesis are briefly dealing with software and hardware servicing of cellular terminals. The attachment then offers two lab tasks, in which the students get acquainted with the UMTS network structure and the behaviour of the cellular terminal in this network.
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Simulation of Cooperation of Agents in Jason Environment
Kříž, Jakub ; Zbořil, František (referee) ; Král, Jiří (advisor)
This work deals with creation of simulator of multi-agent system in which agents cooperate. Reader is introduced to basics of agent systems, their creating and modeling. Design of environment in which agents exist and task they solve is described in this work. There are designed and implemented three levels of racional BDI inteligence of agents with different level of cooperation - without cooperation, weak cooperation and complex cooperation. Whole system is implemented in Jason framework and extensively tested. Behavior of agents is analyzed and levels of intelligence are compared based on simulation experiments. Achieved results prove dominance of team in which agents cooperate more.
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The future of gasoline two-stroke engines
Kříž, Jakub ; Komenda, Lukáš (referee) ; Mazůrek, Ivan (advisor)
My thesis deals with the historical development of two-stroke petrol engines from the very establishment of a two-stroke cycle, mapping the technological development of these engines up to present day, where, in the second half the attention is devoted to the direct comparison of two-stroke engine and a four-stroke engine in the field of ultralight aircrafts.
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Analysis of carriage of Top Drive of drilling tower
Kříž, Jakub ; Kubín, Martin (referee) ; Pokorný, Přemysl (advisor)
The subject of this diploma thesis is determination of the cause of crack formation at the carriage Top drive for MND Drilling & Services company. The aim of the diploma thesis is to analyze the load states of the component. Furthermore, the aim is to create a computational model and boundary conditions and to create suggestions of improvements leading to the elimination of cracks. And finally, to evaluate the results of construction improvements..
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Design and analysis of braking system for cultivator trailer
Dey, Arpan ; Kříž, Jakub (referee) ; Zeizinger, Lukáš (advisor)
A pneumatic drum brake system for a cultivator trailer consists of several components, including the brake drum, brake shoes, pneumatic actuator, air compressor, air reservoir, and control valve. Once the brake pedal is pressed by the driver, the control valve releases compressed air from the air reservoir into the pneumatic actuator (slave cylinder). The actuator converts the air pressure into mechanical force, which pushes the brake shoes against the inner surface of the brake drum. This generates friction, which slows down and stops the trailer. The brake drum is attached to the cultivator trailer's wheel hub and rotates with it. The brake shoes are mounted on a stationary backing plate and positioned inside the brake drum. They are curved to match the contour of the drum's inner surface, maximising the contact area between the shoes and the drum. The air compressor is responsible for supplying compressed air to the system. It draws in air from the environment and compresses it to a much higher pressure, which is stored in the air reservoir. The control valve regulates the flow of air between the reservoir and the actuator, depending on the driver's input (pedal pressure). Overall, the pneumatic drum brake system provides a reliable and effective means of controlling the speed and stopping the cultivator trailer, particularly in heavy-duty applications where high braking forces are required.
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The influence of experienced parenting style on preference and forming own parenting style in adolescents
KŘÍŽ, Jakub
The main theme of the diploma thesis is the topic of educational psychology - parenting styles with a particular focus on adolescents. The theoretical part of the work is devoted in the first chapter to the period of adolescence and developmental changes associated with it, in the second chapter to the historical, traditional but also current concepts of family and education and the last part of the theoretical part of the work to the topic of parenting styles from their definition, first theories, to studies on their influence on the formation of the child's personality, the connection with the following manifestations of antisocial behavior or the risk of various mental disorders. Parenting style as a psychological construct shows long-term high reliability and usability, and many studies still work with this construct and prove that it says a lot about the functioning of the family, especially the parent-child relationship or demonstrate correlation between parenting styles and increased risk of various psychopathological behavior in children and adolescents. In the empirical part of the work, we decided to explore on a sample of 253 Czech adolescents, in what proportion the parenting styles occur in this age category. A quantitative design was selected, and a test battery was created using Dotazník pro zjišťování způsobu výchovy v rodině and BFI-10. When examining parenting styles, experts ask themselves which factors have the greatest influence on what parenting style parents ultimately use when their upbringing their own children. This is the source of the second goal of the research, where we tested relationships between all components of the parenting style of parents and adolescents' components of control. Thus, we examined the quantitative research methodology (correlations) to find out if there are some relationship between parents' emotions towards children (and control) and adolescents' degree of control they would have preferred if they had already been parents as well. We tried to verify with our sample of adolescents how much or whether at all, the individual dimensions of the parents' parenting style influence the gradual formation of their own parenting style, most of whom become parents within a few years. Regarding the occurrence of parenting styles, we found in comparison with previous research in the Czech environment, a smaller incidence of parenting styles representing traditional strict way of child rearing, and conversely a larger share of parenting styles combining either positive or extremely positive emotions towards the child with ambivalent or low control, i.e., parenting that provides children more freedom and plenty of expressions of love. After verifying the hypotheses, we found that in adolescents, the tendency to provide freedom decreases with the increasing negative emotional relationship of their own parents and decreases also with increasing demands of their own parents. A positive correlation was also found between both the components of the requirements (parents - adolescents) and the last and at the same time the highest negative correlation was found between the provided freedom of parents and the requirements of adolescents as future parents. The final hypotheses found a statistically significant positive correlation between the personality trait of agreeableness and the freedom of the adolescent as a future parent.
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