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Web application for matching business offers and requests built on top of Linked Data principles
Snoha, Matej ; Nečaský, Martin (advisor) ; Svoboda, Martin (referee)
The aim of this thesis is to design, develop and test a set of web application components built on top of Linked Data principles. This application works with public procurement data made available thanks to the OpenData.cz initiative. The role of the components developed is matching of business offers and requests as well as comparison of public contracts. Introduced are Semantic Web technologies in the context of web application development, an abstract component for the development of web applications using Linked Data as well as developed components based on it. In this work, we have gone through the application lifecycle, from analysis of available technologies and the requirements for the application through design of the application and its individual layers up to implementation of required functionality and subsequent deployment of functional application. 1
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Creation of a dataset containing publications of Charles University according to the Linked Data principles
Hladík, Tomáš ; Klímek, Jakub (advisor) ; Knap, Tomáš (referee)
The aim of this thesis was to create a dataset about publications of Charles University, that will be friendlier for computer processing and subsequent visualization. There is already existing official application, which includes every publication issued by Charles University, nevertheless the application does not work perfectly because of the large amount of data. Information has been gained through exports in XML, further the data has been processed into the desired format, over which we can query much faster than it is in the official application. The process has been made by using programming language Java. We engage Charles University into the Linked Universities project, which brings together universities providing data in a computer-friendlier format.
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Extracting Linked Data from Excel Files
Dembinný, Šimon ; Nečaský, Martin (advisor) ; Bednárek, David (referee)
Title: Extracting Linked Data from Excel files Author: Šimon Dembinný Department: Department of Software Engineering Supervisor of the bachelor thesis: Mgr.Martin Nečaský, Ph.D, Department of Software Engineering at Faculty of Mathematics and Physics of Charles University Abstract: The major part of the thesis rests in the development of an application for extracting Linked Data from Excel files. The application is created as Microsoft Excel Add-on. The comparison with best freely available tool for Linked Data extraction from table data "Open refine" is provided in the theoretical part together with explanation of the concept of Linked Data itself.
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Tool for NDL
Myazina, Elena ; Richta, Karel (advisor) ; Kopecký, Michal (referee)
Title: Tool for NDL Author: Elena Myazina Department: Department of Software Engineering Supervisor: Doc. Ing. Karel Richta, CSc. Supervisor's Supervisor's e-mail address: richta@ksi.ms.mff.cuni.cz Abstrakt: -Current research networks allow end users to build their own application-specific connections (lightpaths) and Optical Private Networks (OPNs). This requires a clear communication between the requesting application and the network. The Network Description Language (NDL) is a vocabulary designed to describe optical networks based on the Resource Description Framework (RDF). These descriptions aid applications in querying the capabilities of the network and allow them to clearly express requests to the network. This work deals with the analysis of the current draft language NDL systems and optical components. He compares its potential and shortcomings of the proposal seeks. It also proposes a graphical representation corresponding to that language, which implements the graphical tool. The developed tool will allow the subsequent dialogs (voice) applications. Key words: NDL, RDF, optical mapping technology.
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Governmental Linked Data and Experimental Application
Pošepný, Tomáš ; Nečaský, Martin (advisor) ; Stárka, Jakub (referee)
The aim of this thesis is to introduce the technologies of Resource Description Framework and Linked Data and map the current situation in pub- lishing procurement in the Czech Republic on the Internet. The thesis is focused on problems and de ciencies in the publishing and o ers solution in the form of Government Linked Data. Along with that, an experimental application for scraping and triplifying public contracts from the E-ZAK system is developed. It also allows possible later extensions for other systems administrating public procurement. The obtained RDF dataset is mashed up with a Linked Data da- ta source for public contracts posted in ISVZ containing also information about organizations from ARES system. The mashed data are visualized in a simple Web application. In the conclusion, the entire thesis is summarized and a couple of hints for developers of similar applications are mentioned.
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Semantic Navigator
Michelfeit, Jan ; Knap, Tomáš (advisor) ; Svoboda, Martin (referee)
The Semantic Web extends principles of the Web from documents to data. The Web of Data facilitates machines to understand the meaning of information. Semantic web search engines can take advantage of this fact and offer more precise search results and advanced query capabilities. The aim of this thesis is to use semantic data in web documents in order to enhance navigation between related web pages and bring advantages of semantic web search engines to ordinary users. We present Semantic Navigator as a solution to this task. Semantic Navigator is implemented as a Mozilla Firefox extension. The extension uses the Sindice search service for discovery of related documents and provides access to information summaries on Sig.ma.
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Indexing Linked Data
Conicov, Andrei ; Nečaský, Martin (advisor) ; Skopal, Tomáš (referee)
The fast evolution of the World Wide Web has offered the possibility to publish a huge amount of linked documents. Each such document represents a valuable piece of information. Linked Data is the term used to describe a method of exposing and connecting such documents. Even if this method is still in an experimental phase, it is already hard to process all existing data sources and the most obvious solution is to try and index them. The study addresses questions on how to design an index that will be capable to operate with millions of such entries. It analyses the existing projects and describes an index that may fulfill the requirements. The prototype implementation and the provided test results offer additional information about the index structure and effectiveness.
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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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Semantic Annotation of the OpenDocument Format
Nakládal, Jan ; Šperka, Svatopluk (referee) ; Schmidt, Marek (advisor)
This work is about analysis, design and implementation of application as an extension to office suite OpenOffice.org. This application allows users to view metadata RDF format found in text content and editing By using this functionality, we can see specific information about people, places or objects mentioned in the document and paste it directly into the document itself. Practical we can use this for more details information about the person used in text.
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