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Testing parameters of stepper motors at different microstepping mode
Műller, Jakub ; Chalupa, Jan (referee) ; Klimeš, David (advisor)
This thesis deals with design and construction of test equipment that allows measurements of basic parameters of stepper motors. The first part is devoted to the search about the principle of operation of the hybrid stepper motor. For the analysis engine has been used a mathematical simulation model with real parameters in Matlab/Simulink. The next section is the design of mechanical and electronic form of the test facility with a description of the components used. The last part of this work is focused on measuring the excitation currents and measuring loss of steps at various control modes and microstepping.
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Implementation of an evolutionary expert system
Bukáček, Jan ; Müller, Jakub (referee) ; Karásek, Jan (advisor)
This thesis is focused on working up evolutionals and genetics algorithms issues Especially for multiobjective algorithms VEGA, SPEA and NSGA – II. Thereinafter one of FrameWork working with genetics algorithms namely WWW NIMBUS. From this mentioned algorithms was selected VEGA algorithm for implementation in JAVA to preselected problem. Thereby problem is choice thick columns of profile according to predetermined criteria. Selected algorithm works on division of population into several groups and each group evaluates the resulting fitness function. Here is a sample implementation of this algorithm. Furthermore there is a example of working with FrameWork. In the next section are compared the results of generated progam with results that were obtained by FrameWork WWW NIMBUS. As for VEGA, and the Nimbus there are shown different results. The VEGA is presented also the development of individual fitness functions. Also, there are shown graphs, that can be obtained from NIMBUS. At the end of work is introduced the comparation of the results ane propose possible improvements.
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Streaming of compressed multimedia content
Tesař, Pavel ; Číka, Petr (referee) ; Müller, Jakub (advisor)
The topic of the master's thesis is about transmission of multimedia via network with help of compression’s algorithm used in codec MPEG-4 part 10 and Real Time Protocol (RTP). First part of this master thesis will be familiarization with basic terms about multimedia. It will be queried about techniques of compression axioms for audio and video, justification for necessary use of compression in transmitting multimedia via network. Also, here will be subscribed principles and properties of Real Time Protocol, which was designed for multimedia stream. From the start, competent codec for implementation of two applications (client, server) with read raw video and audio data, will choose the following : compression with help of codec Theora (Vorbis), transfer via network in RTP packets, decode and play at visual form for end user. Complete subscription of implementation for both applications written in programming languages C/C++ and Java, will be certain. The basic overview about this problematic experience with implementation, which were here concluded, are the reasons for reading this master thesis.
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JavaME Application for Betting on sport results
Kubalík, František ; Müller, Jakub (referee) ; Číka, Petr (advisor)
This bachelor thesis deals with the design and implementation of applications for mobile terminals, which allows user to bet on sports games. The functionality of this application is dependent on a central database, whose proposal is also part of this work. The first section describes the basic features of programming languages, which were used for the implementation of the project. Gradually, it is described in Java, SQL and PHP. The correct formation of tables and a description of problems that may arise in the design of the database are mentioned. Next chapter describes the actual implementation of the project. It described the methods and a more detailed description of the implementation of the various parts the project comprises. This section also contains a test created by the application.
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Current methods for geolocation of Internet hosts
Doležel, Pavel ; Müller, Jakub (referee) ; Balej, Jiří (advisor)
This bachelor work deals with IP geolocation, which means the estimation of geographical location of unknown host in the Internet. The aim of my thesis was to make a delay measurement in PlanetLab Network and then with the use of GeoPing technique estimate the real location of the target. The main part of this work is focused on several different delay-based methods, especially GeoPing which employs „Nearest Neighbor in Delay Space“ algorithm in order to exploit the relationship between network delay and geographic location. Base ground for GeoPing is a database of the machines at known location. This database is composed of 9 probe machines, 260 hosts is used like a landmarks and targets. Estimation of unknown geographical location was done on 60 hosts.
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Synchronized data transfer of signalling in IPTV
Figurny, Roman ; Karásek, Jan (referee) ; Müller, Jakub (advisor)
The task of Bachelor's thesis has been to develop synchronizing mechanism for signaling servers, called Feedback Targets, in hierarchical structure of the feedback tree. Then verify the function of this designed synchronizing mechanism in simulation developed in Java. Using this synchronizing mechanism to shorten the time needed to travel the signaling packets trough the feedback tree and using this to obtain better reaction to possible network junction or significant packet loss while distributing multimedia data while using IPTV. In theoretic part of the thesis there are described basic protocols like RTCP, RTP and TTP. Then are described methods for packet sending in network (multicast, unicast and broadcast). The basic piece of knowledge about IPTV, its distribution and differences between IPTV and classic internet media streaming are described. Also basic terms like Feedback Target, Feedback Target Manager and FTI, FTS and FTD packets are described as well.
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Human activity classification
Müller, Jakub ; Smital, Lukáš (referee) ; Smíšek, Radovan (advisor)
This bachelor's thesis describes daily activity classification using accelerometric data. The first theoretical part summarizes the basics about daily activity and benefits that we get from monitoring it. In the next part of theory the principles of accelerometer inner workings are described. The last part of theory is dedicated to explaining the basics of neural networks and SVM. The aim of the practical part was to find a suitable dataset from a publicaly shared database, containing daily activity accelerometric data and also to collect our own data. Then performing classification using our own algorithm, optimizing it and finally evaluating the results.
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Composite printing for 3D FDM printer
Műller, Jakub ; Sliwková, Petra (referee) ; Zemčík, Oskar (advisor)
This diploma thesis deals with the study of 3D printing based on the FDM method. This method focuses on the possibility of using two extruders it means that the composite parts can be printed. This diploma thesis describes the available variants of composite printing currently on the market. Based on the gained knowledge and the availability of 3D printers and software, individual variants of composite parts were printed. A tensile test was performed on these samples to determine the strength characteristics. Additionally, compatibility and adhesion of two selected materials were tested. Based on the testing is made an evaluation of the achieved results, effectiveness and feasibility.
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Current methods for geolocation of Internet hosts
Doležel, Pavel ; Müller, Jakub (referee) ; Balej, Jiří (advisor)
This bachelor work deals with IP geolocation, which means the estimation of geographical location of unknown host in the Internet. The aim of my thesis was to make a delay measurement in PlanetLab Network and then with the use of GeoPing technique estimate the real location of the target. The main part of this work is focused on several different delay-based methods, especially GeoPing which employs „Nearest Neighbor in Delay Space“ algorithm in order to exploit the relationship between network delay and geographic location. Base ground for GeoPing is a database of the machines at known location. This database is composed of 9 probe machines, 260 hosts is used like a landmarks and targets. Estimation of unknown geographical location was done on 60 hosts.
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Localization of nodes in Internet using Lighthouses system
Smrčka, Lukáš ; Müller, Jakub (referee) ; Komosný, Dan (advisor)
The thesis is focused on the localization of stations in the Internet with the help of artificial coordinate systems. These systems can be used to estimate the delay value of RTT between individual stations. The estimated delay value can e.g. help the station to choose an optimal second station for communication between two stations without the necessity to measure these values, which reduces the load of the net. The first part of the thesis describes systems that predict the delay and explains how the methods Vivaldi, Kings, GNP and Lighthouses work. The next part of the work gives basic information about environment where the chosen method shall be implemented. The final part defines both the Lighthouses method and a program designed to be used in the experimental PlanetLab network and it also evaluates achieved accuracy of the estimation.
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