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Satellite data management and analysis
Krška, David ; Lokoč, Jakub (advisor) ; Nečaský, Martin (referee)
The aim of this bachelor thesis is to implement and test an interactive application for the analysis, visualization and classification of satellite data. The satellite data are preprocessed and automatically composed into colored images. The application allows to create and compare two types of classification algorithms. The first type uses single images and the second type uses multiple images of the same place, but at different times. We also created an interface for selecting and managing the training data. A few well-known classification algorithms of both types were implemented and their success rates were compared in an experiment. All the satellite data used in the experiment are from the Landsat program. The result of this bachelor thesis is an application primarily focused on classification. But the application could also be extended into a complex GIS system. Powered by TCPDF (www.tcpdf.org)
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Hlasové ovládání pro efektivní editaci textu
Citorík, Juraj ; Lokoč, Jakub (advisor) ; Skopal, Tomáš (referee)
The aim of this thesis is to provide a comprehensive introduction to digital sound processing and speech recognition. Selected speech recognition features as well as algorithms are introduced and utilized in a voice controlled text editor and a .NET class library. The performance of the features is evaluated in both speaker-dependent and speaker-independent recognition of commands related to text editing. The library provides a straightforward way of implementing a speaker-dependent, domain-constrained voice recognition in an arbitrary application. It is used in a simple voice controlled text editor. The editor allows the user to assign voice commands to built-in actions. In this way, it is possible for inexperienced users to access and use advanced features of the program without having to learn complex workflows. Moreover, this approach is language-agnostic and can even be used by people with speech impairments as opposed to majority of presently used voice recognition systems. The results of the experiments indicate that, given a recording of sufficient quality, the presented features and algorithms provide an effective means to implement a speaker-dependent speech recognition system, which can be used in a voice controlled text editor. Powered by TCPDF (www.tcpdf.org)
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Scheduling program for elementary and secondary schools
Cesar, Robert ; Kopecký, Michal (advisor) ; Lokoč, Jakub (referee)
Rozvrhovatko is a program dedicated for basic and high schools of small or medium size. The employees who are responsible for creating timetables for the school are provided with a simple tool which will save their time every year when they have to construct new timetables. Program can modify output of its generator by many parameters, such as number of lessons per day, required approbations for subjects, size of groups of students or free hours for chosen teachers. Secondary aim of program is to help those employees, who used to schedule everything on papers, to begin with automatic scheduling.
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Implementation of selected database operations in parallel environment
Majdan, Ján ; Bednárek, David (advisor) ; Lokoč, Jakub (referee)
Title: Implementation of selected database operations in parallel environment Author: Bc. Ján Majdan Department: Department of Software Engineering Supervisor: RNDr. David Bednárek, Ph.D. Abstract: This thesis describes several design possibilities of database operations in a parallel environment called Bobox. First, the thesis covers theory of da- tabases as well as algorithms needed to implement database operations in main memory. Next part discusses the usage of hash tables to implement parallel data- base operations. The key principles discussed contain hashing approaches based on a shared hash table, as well as principles of data preprocessing (local hash Table). The thesis then describes practical usage of selected database operations, which were implemented based on the principles described in the first theory sec- tions. The implementation also involves performance measurement at different levels of parallelism. Finally, acquired results are analyzed and discussed in terms of scalability of parallelism and performance in the Bobox environment. Keywords: database operations, Bobox, parallelism, hashing, data preprocessing 1
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IS for organizaton's production monitoring
Dzurenko, Tomáš ; Hoksza, David (advisor) ; Lokoč, Jakub (referee)
Storing and processing data is a prerequisite to succesful functioning of every organisation. This work deals with implementation of easily accessible and user friendly application which would provide tools for simple data in- put and subsequent displaying of these data in a predefined reports. Reports can be displayed for any time period and with different level of grouping. Important feature of this application is comparing inserted data with prede- fined plans. Application is built using ASP.NET and C# technology. Data are stored using Microsoft SQL Server 2005. 1
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Visualisation of Text Retrieval Algorithms
Remiš, Daniel ; Kopecký, Michal (advisor) ; Lokoč, Jakub (referee)
The work deals with design and implementation of the program, which is used to clarify the operation of algorithms for searching through text using a graphical view of their structures. The work also includes some analyzis of already existing, interesting visualization tools designed to address other areas.
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Hybrid databases
Hušek, Radek ; Mareš, Martin (advisor) ; Lokoč, Jakub (referee)
This thesis presents design and implementation of a data structure, which tries to combine advantages of both databases and regular data structures. Main advantages of databases we try to retain are data persistence through storing data on a hard disk and working with data using transactions which allows us parallel access without danger of inconsistency. From data structures we borrow the implementation as a library of functions and the aim on simplicity and storing data in memory. Our implementation is built around the concept of (software) transactional memory; all data are stored on hard drive as log of operations. 1
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Podobnostní vyhledávání obrázků na webu
Grošup, Tomáš ; Lokoč, Jakub (advisor) ; Hoksza, David (referee)
The subject of this bachelor thesis is to design and create a web portal, enabling efficient indexing and content-based searching of images obtained from various free image databases (e.g., results from a keyword-based search engine). The portal provides fast feature extraction technique and for the visual similarity, the signature quadratic form distance is utilized. The search supports various user settings and comparison of their results. Search results can also be presented using a layout based on particle physics, which supports exploration and multi-query.
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Nové dynamické metody konstrukce pro PM-strom
Čech, Přemysl ; Lokoč, Jakub (advisor) ; Pangrác, Ondřej (referee)
With the emerging applications dealing with complex multimedia retrieval, such as the multimedia exploration, appropriate indexing structures need to be designed. A formalism for compact metric region description can significantly simplify the design of algorithms for such indexes, thus more complex and efficient metric indexes can be developed. In this thesis, we introduce the cut-regions comprising compact metric region description and basic operations. To demonstrate their power, we redefine the PM-Tree using the cut-regions and, moreover, use the formalism to improve the PM-Tree construction techniques. We have experimentally evaluated that the improved construction techniques lead to query performance originally obtained just using expensive construction techniques. Also in comparison with other metric and spatial access methods, the revisited PM-Tree proved its benefits.
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