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Publishing of bibliographic information according to the Linked Data principles
Hladká, Jitka ; Sklenák, Vilém (advisor) ; Svátek, Vojtěch (referee)
Bibliographic data provide well established means of the information resource description. Nowadays, there is obvious need to make this data more web-friendly and web-compatible, while web is mostly seen as the only place where people are seeking information. The proposed solution is to change the traditional bibliographic data representation format. Semantic Web initiative presents enhancement of the current web with machine processable data semantics (meaning). The main goal is to manage more effective information processing by web applications that brings up many benefits for web users. Linked data are seen as practical means to reach the semantic web vision. This initiative promotes best practices of publishing, connecting and sharing structural data on the web. This thesis reports the transformation of bibliographic records' format in case of Database of publishing activities at University of Economics, Prague (PCVSE). Benefits of linked data publishing model are demonstrated on the realized projects. The main part describes practical experiences gained during the implementation of RDF framework in phases of data modelling, interlinking and exposing the dataset. The linked data publishing model is seen there as an optimal web-compatible bibliographic data representation format.
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SPARQL plugin for Ontopia Knowledge Suite
Ovčáčík, Vlastimil ; Kliegr, Tomáš (advisor) ; Svátek, Vojtěch (referee)
Reader of this bachelor thesis will familiarize with two technologies of semantic web -- Topic Maps and RDF. In the first half of this document we can find principles, history and thoughts on near future of both technologies. There are explained necessary principles of both standards. Emphasis is placed on query languages SPARQL and TMQL. Object of this thesis is understanding differences and mutual aspects of both Topic Maps and RDF. This understanding is key for finding interoperability between these two technologies on semantic web. The second half of this thesis is aimed on implementation of sparql4ontopia - a plugin for Ontopia Knowledge Suite, which enables quering topic maps with SPARQL. This plugin utilizes Sesame project for SPARQL query evaluation and Nikunau tool from SesameTM project for mapping SPARQL on Topic Maps Data Model. Possibilities and limitations of this plugin are described. There is also description of sparql4ontopia development and implementation. Last chapter shed light on SPARQL endpoint and possible way of implementation into Ontopia Knowledge Suite.
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Support of Semantics in CMS Drupal
Kubaliak, Lukáš ; Svátek, Vojtěch (advisor) ; Hazucha, Andrej (referee)
The work concern about the support of semantics in known content managing systems. It is describing the possibilities of use for these technologies and their public accessibility. We find out, that today's technologies and methods are in the state of public inducting. In the question of semantic support in CMS Drupal we developed a tool for extending its support of semantic formats. This tool allows CMS Drupal to export its information in a Topic Maps format. For this it uses the XTM file.
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Structured data on the Web: Comparison of Linked Data and Web APIs
Zemánek, Jan ; Svátek, Vojtěch (advisor) ; Sklenák, Vilém (referee)
The aim of this work is, firstly, to describe the two popular ways of making structured data accessible on the Web, namely Web APIs and Linked Data; secondly, it is to conduct a theoretical survey of features of each of these two techniques. The contribution of this work lays in a table comparing Web APIs and Linked Data and a detailed description of each of the items in the table. In conclusion, this work gives a verdict on which one of these two techniques leads from a technological point of view to more reusable data on the Web.
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Web interface for ontology similarity measures
Pichl, Ota ; Zamazal, Ondřej (advisor) ; Svátek, Vojtěch (referee)
Semantic Web is one of the most recent topics on the internet. The idea of Semantic Web is associated to informatics ontologies which can provide features for description of web knowledge. Ontologies than bring the feature of semantic annotation for data and knowledge on the internet. This work is focused on comparison of ontologies and determination of their similarity or dissimilarity. Determination of these similarities can be made with various types of methods like vector space measures or collection measures. It is appropriate to implement these methods due to problems and uncertainties which ontologies can bring. Ontology independence is one of the basic characteristics (open world assumption) and because of independence there can appear certain conflicts if exist two ontologies describing the same part of reality. There can be a problem when these two ontologies describe the same entity but with different label or in different structure. Nevertheless there are many other reasons for making these comparisons e.g. extension of semantic search engines or searching for similar ontologies which could be joined together. Solution of this problem can be found in ontology similarity measures. Currently there is no application like this which would provide methods for ontology measures. The main goal of this bachelor thesis is to create a web interface which will provide essential methods for determination of ontology similarity.
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Classification of electronic documents using cluster analysis
Ševčík, Radim ; Řezanková, Hana (advisor) ; Svátek, Vojtěch (referee)
The current age is characterised by unprecedented information growth, whether it is by amount or complexity. Most of it is available in digital form so we can analyze it using cluster analysis. We have tried to classify the documents from 20 Newsgroups collection in terms of their content only. The aim was to asses available clustering methods in a variety of applications. After the transformation into binary vector representation we performed several experiments and measured the values of entropy, purity and time of execution in application CLUTO. For a small number of clusters the best results offered the direct method (generally hierarchical method), but for more it was the repeated bisection (divisive). Agglomerative method proved not to be suitable. Using simulation we estimated the optimal number of clusters to be 10. For this solution we described in detail features of each cluster using repeated bisection method and i2 criterion function. In the future focus should be set on realisation of binary clustering with advantage of programming languages like Perl or C++. Results of this work might be of interest to web search engine developers and electronic catalogue administrators.
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Ontology-Driven Self-Organization of Politically Engaged Social Groups
Belák, Václav ; Svátek, Vojtěch (advisor) ; Nováček, Vít (referee)
This thesis deals with the use of knowledge technologies in support of self-organization of people with joint political goals. It first provides a theoretical background for a development of a social-semantic system intended to support self-organization and then it applies this background in the development of a core ontology and algorithms for support of self-organization of people. It also presents a design and implementation of a proof-of-concept social-semantic web application that has been built to test our research. The application stores all data in an RDF store and represents them using the core ontology. Descriptions of content are disambiguated using the WordNet thesaurus. Emerging politically engaged groups can establish themselves into local political initiatives, NGOs, or even new political parties. Therefore, the system may help people easily participate on solutions of issues which are influencing them.
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Data integration and automatic task processing
Meisner, Tomáš ; Nemrava, Jan (advisor) ; Svátek, Vojtěch (referee)
This diploma thesis deals with automatic task processing, especially with automatic processing of forms on web pages. The thesis throws light on the theoretical and practical matter. At the beginning of this thesis are described the reasons, why this topic were chosen. Also there are mentioned the possible uses of application, realized on this principles. Foremost simplification of retrieval of data with standardized (but general) format from common users, which could be used for data mining process. For creating this kind of application is described concepts of its implementation, including description of problematic parts and their possible solution. In this part is mentioned algorithm, which deals with security limitation of current web browsers -- so-called cross-site scripting. One part of this thesis is description of current commercial and non-commercial solutions, which at least partly fulfills the demands of the application. At the conclusion is analyzed functionality of created application and proposed advancements and improvements for creating new versions of application
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Web support of conference holding (presentation, registration etc.)
Kloud, Daniel ; Berka, Petr (advisor) ; Svátek, Vojtěch (referee)
This thesis deals with web support of conference holding and its main focus is to create an application which meets the requirements specified by the work co-ordinator and which supports certain processes in conference holding. In the first chapter you can find the brief history of World Wide Web and of conference holding systems. It covers different options using which these systems can ease and improve conference holding from both holder's and participant's perspective. The next three chapters provide a brief description of the application followed by a summary of used technologies and take a look at the functional side of the application. The user's guide of the application forms the most extensive part of the thesis. The last chapter provides a brief description of two existing systems for conference management -- one of which is free and the other commercial.
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Webový průvodce světem expertních systémů
Faruzel, Petr ; Berka, Petr (advisor) ; Svátek, Vojtěch (referee)
Předkládaná práce "Webový průvodce světem expertních systémů" se zabývá expertními systémy. Cílem této práce je vytvořit učební pomůcku pro zájemce o problematiku expertních systémů, která by primárně sloužila studentům kurzu 4IZ229 (Úvod do umělé inteligence) k ucelení jejich poznatků. Jejím úkolem je osvětlit čtenáři pojem expertní systém, přiblížit základní principy těchto aplikací, nastínit proces jejich tvorby a poskytnout tak ucelený přehled o expertních systémech včetně jejich zhodnocení. Jak již z názvu práce vyplývá, vytvořená učební pomůcka je zpřístupněna formou webové prezentace v síti internet. Webový průvodce obohatí celou práci o výhody interaktivního přístupu a zaslouží se o zvýšení její dostupnosti. Vedle rozboru základních principů expertních systémů a názorných ukázek situací na konkrétních příkladech obsahuje rovněž množství odkazů na další zdroje v síti internet týkající se expertních systémů. Obecným přínosem této práce je kromě tvorby samotné učební pomůcky a zmapování problematiky expertních systémů rovněž i demonstrace uvedených poznatků prostřednictvím jednoduchého expertního systému. V úvodní části své studie popisuji umělou inteligenci, přibližuji její definici, zabývám se stavovým prostorem a skrze stručný historický přehled se dostávám k expertním systémům. Dále vysvětluji expertní systém, jeho strukturu, základní charakteristiky, typy expertních úloh a typologii expertních systémů. Následuje rozbor jejich základních principů, v němž se zabývám zejména otázkou reprezentace znalostí, inference a neurčitosti. Závěrečná část práce je věnována procesu tvorby expertních systémů, především pak tvorbě vlastní aplikace. Jedná se o bázi znalostí zpřístupněnou prostřednictvím webové služby ES NEST v síti internet. Tento jednoduchý expertní systém zabývající se výběrem studijního oboru na Vysoké škole ekonomické v Praze poslouží jednak k názorné demonstraci uvedených poznatků, jednak ke zhodnocení potencionálních výhod a nevýhod expertních systémů.
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