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Data-driven Web Application Generator
Potoček, Tobiáš ; Helmich, Jiří (advisor) ; Škoda, Petr (referee)
This thesis is addressing the issue that we are not able to fully utilize the potential of all the data that the contemporary world around us is constantly producing. The goal of this thesis is to implement a Linked Data driven web application generator that allows lay users to generate web applications from multiple RDF data sources. The application generator automatically analyzes the data sources to help the user with the generation process. Each generated application can be configured and published. The generator contains a list of different types of applications that can be generated depending on the type of input data. This list can be extended and the generator works as a framework which simplifies the process of adding support for new types of applications and new types of data. The generator is also a platform. It allows users to create accounts to manage their published applications and it also features a catalog of published applications and a repository of publicly available data sources that any user can use to generate a new application. The generator is integrated into LinkedPipes Visualization tool. Powered by TCPDF (www.tcpdf.org)
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Querying RDF graphs stored in a relational database using SPARQL and R2RML
Chaloupka, Miloš ; Nečaský, Martin (advisor) ; Kopecký, Michal (referee)
The RDF framework is becoming a popular framework for presenting data. It makes the data easily accessible and queryable. But the most common way how to store structured data is to use a relational database systems. The relational databases benefit from their long theoretical and practical history, however the relational database does not offer any convenient way how to publish the data. It is essential to create a mapping between these two worlds, to publish the data stored in a relational database in the RDF format. In the presented work we study the SPARQL algebra and create a transformation algorithm that enable us to create a virtual SPARQL endpoint over the relational data. We apply the acquired knowledge in implementation of a tool which uses the algorithm to proof the concept. Powered by TCPDF (www.tcpdf.org)
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Towards Efficient Parallel Data Processing on Modern Hardware
Falt, Zbyněk ; Yaghob, Jakub (advisor) ; Smrž, Pavel (referee) ; Benkner, Siegfried (referee)
Parallel data processing is a very hot topic in current research, since the amount of data and the complexity of the operations performed on them has been increasing significantly in the past few years. In this thesis, we focus on a specific domain of this research -- the design and implementation of parallel algorithms used mainly in database systems. First, we introduce important enhancements in the Bobox system, which is a framework for the development of parallel data processing applications. Then, we introduce a new domain specific language called Bobolang which makes the implementation of those applications easier. Next, we propose parallel and scalable algorithms used in the domain of databases, namely sort and merge join, and introduce their efficient implementation using the combination of Bobox and Bobolang. Finally, we introduce parallel runtime for SPARQL engine as an example of a parallel data processing application which demonstrates the main contributions of this thesis in complex and real-life situations. Powered by TCPDF (www.tcpdf.org)
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SPARQL compiler for Bobox
Čermák, Miroslav
The goal of the work is to design and implement a SPARQL compiler for the Bobox system. In addition to lexical and syntactic analysis corresponding to W3C standard for SPARQL language, it performs semantic analysis and optimization of queries. Compiler will constuct an appropriate model for execution in Bobox, that depends on the physical database schema.
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Ontological Reasoning with Taxonomies in RDF Database
Hoferek, Ondřej ; Nečaský, Martin (advisor) ; Svoboda, Martin (referee)
13548805670613-46162052c208770f99e83a586780d16c.txt As the technologies for the realisation of the idea of the Semantic Web have evolved rapidly during past few years, it is possible to use them in variety of applications. As they are designed with the ability to process and analyze semantic information found in the data in mind, they are particularly suitable for the task of enhancing relevance of the document retrieval. In this work, we discuss the possibilities of identifying a suitable subset of the expressing capabilities of the SPARQL querying language and create a component that encapsulates the technical details of its usage. Page 1
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Comparison of approaches to storing linked open data
Hanuš, Jiří ; Chlapek, Dušan (advisor) ; Kučera, Jan (referee)
The aim of this diploma thesis is a detail description of current possibilities and ways of storing open data. It focuses on tools and database systems used for storing linked open data as well as on the selection of such systems for subsequent analysis and comparison. The practical part of the thesis then focuses on the comparison of selected systems based on a selected use case. This thesis introduces the fundamental terms and concepts concerning linked open data. Besides that, various approaches and formats for storing linked open data (namely file ori-ented approaches and database approaches) are analyzed. . The thesis also focuses on the RDF format and database systems. Ten triplestore database solutions (solutions for storing data in the RDF format) are introduced and described briefly. Out of these, three are cho-sen for a detailed analysis by which they are compared with one another and with a rela-tional database system. The core of the detail analysis lies in performance benchmarks. Ex-isting performance oriented benchmarks of triplestore systems are described and analyzed. In addition to that, the thesis introduces a newly developed benchmark as a collection of database queries. The benchmark is then used for the performance testing. The following systems have been tested: Apache Jena TDB/Fuseki, OpenLink Virtuoso, Oracle Spatial and Graph a Microsoft SQL Server. The main contribution of this thesis consists in a comprehensive presentation of current possibilities of storing linked open data.
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Utilization of Open Data
Ferdan, Ondřej ; Jarolímek, Jan (advisor) ; Pavel, Pavel (referee)
Main goal of this diploma thesis is characterization of open data, standards and analyzation of adoption and utilization of open principles in the public sector of the Czech Republic. And comparison with European Union and chosen countries. Identifies technology and tools for linked data, used for deployment of highest rating of data openness. Defines geographical data, its standards and INSPIRE directive for spatial information in Europe. The goal of practical part of thesis is to analyze adoption of open principles for geographical data between Czech institutions. Focusing on what data are available, if open principles are applied and on what circumstances are data available. Foreign countries are also covered for the comparison.
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RDF Repository in PHP
Raška, Jiří ; Chmelař, Petr (referee) ; Burget, Radek (advisor)
This Bachelor Thesis describes a problem of design and implementation a RDF repository in PHP. This thesis solves storing data model RDF in relational database and solves implementation of subset query language SPARQL. Part of this thesis are performance and functional tests with implemented RDF repository.
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Transformation of Web Applications into Web Services
Zámečník, Miroslav ; Rychlý, Marek (referee) ; Weiss, Petr (advisor)
Present web is aiming to the possibility of automatization of user behavior on web applications. Adding of semantics and creation of web service interface are the main approaches for accomplishment of this user comfort. Nevertheless, this direction brings some problems which can make more difficult publishing and implementation of web documents. Web services can connect heterogeneous systems, because they are based on XML markup language that is a place where all applications can meet without lost of platform independence. The automatic transformation of a web application into a web service could be considerably more effective than to create a web service from the beginning. However, this step is for some applications almost unreal without knowledge of their inner structure. In most cases, the transformation will be done semiautomatically with help of human decisions.
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Comparison of RDF Databases
Chatrný, Jakub ; Burget, Radek (referee) ; Milička, Martin (advisor)
The goal of this thesis is compare of several RDF stores Blazegraph, Jena TDB and Stardog. Design of test suites is based on existings benchmarks. In the designed test suites are monitored execution time and number of results. The testing criteria of stores also include the time required to create persistent store and its size. All tested stores and the program for testing itself are implemented in Java.
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