National Repository of Grey Literature 93 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
Discovering and Creating Relations among CSV Columns Using Linked Data Knowledge Bases
Brodec, Václav ; Nečaský, Martin (advisor) ; Svoboda, Martin (referee)
A large amount of data produced by governmental organizations is accessible in the form of tables encoded as CSV files. Semantic table interpretation (STI) strives to transform them into linked data in order to make them more useful. As significant portion of the tabular data is of statistical nature, and therefore comprises predominantly of numeric values, it is paramount to possess effective means for interpreting relations between the entities and their numeric properties as captured in the tables. As the current general-purpose STI tools infer the annotations of the columns almost exclusively from numeric objects of RDF triples already present in the linked data knowledge bases, they are unable to handle unknown input values. This leaves them with weak evidence for their suggestions. On the other hand, known techniques focusing on the numeric values also have their downsides. Either their background knowledge representation is built in a top-down manner from general knowledge bases, which do not reflect the domain of input and in turn do not contain the values in a recognizable form. Or they do not make use of context provided by the general STI tools. This causes them to mismatch annotations of columns consisting from similar values, but of entirely different meaning. This thesis addresses the...
Conceptual modeling of neurosurgical data.
Bystroň, Jakub ; Říha, Antonín (advisor) ; Nečaský, Martin (referee)
We present a new minimalistic conceptual model for hierarchical data called AC-model. Syntax part of this model is based upon the regular tree grammar theory. AC-model is composed of two parts - Archetype model and Constraint model. A-model is intended to model arbitrary regular tree grammar, C- model adds a first order logic constraints. We also prove that validity problem for ACmodel is NP-hard and conformance problem is undecidable. Along with this thesis C-model based validator of XML documents' semantics is presented. Powered by TCPDF (
Interactive web crawling and data extraction
Fejfar, Petr ; Ježek, Pavel (advisor) ; Nečaský, Martin (referee)
Title: Interactive crawling and data extraction Author: Bc. Petr Fejfar Author's e-mail address: Department: Department of Distributed and Dependable Systems Supervisor: Mgr. Pavel Je ek, Ph.D., Department of Distributed and De- pendable Systems Abstract: The subject of this thesis is Web crawling and data extraction from Rich Internet Applications (RIA). The thesis starts with analysis of modern Web pages along with techniques used for crawling and data extraction. Based on this analysis, we designed a tool which crawls RIAs according to the instructions defined by the user via graphic interface. In contrast with other currently popular tools for RIAs, our solution is targeted at users with no programming experience, including business and analyst users. The designed solution itself is implemented in form of RIA, using the Web- Driver protocol to automate multiple browsers according to user-defined instructions. Our tool allows the user to inspect browser sessions by dis- playing pages that are being crawled simultaneously. This feature enables the user to troubleshoot the crawlers. The outcome of this thesis is a fully design and implemented tool enabling business user to extract data from the RIAs. This opens new opportunities for this type of user to collect data from Web pages for use...
Converting HTML product data to Linked Data
Kadleček, Rastislav ; Nečaský, Martin (advisor) ; Svoboda, Martin (referee)
In order to make a step towards the idea of the Semantic Web it is necessary to research ways how to retrieve semantic information from documents published on the current Web 2.0. As an answer to growing amount of data published in a form of relational tables, the Odalic system, based on the extended TableMiner+ Semantic Table Interpretation algorithm was introduced to provide a convenient way to semantize tabular data using knowledge base disambiguation process. The goal of this thesis is to propose an extended algorithm for the Odalic system, which would allow the system to gather semantic information for tabular data describing products from e-shops, which have very limited presence in the knowl- edge bases. This should be achieved by using a machine learning technique called classification. This thesis consists of several parts - obtaining and preprocessing of the product data from e-shops, evaluation of several classification algorithms in order to select the best-performing one, description of design and implementation of the extended Odalic algorithm, description of its integration into the Odalic system, evaluation of the improved algorithm using the obtained product data and semantization of the product data using the new Odalic algorithm. In the end, the results are concluded and possible...
Web application for concert database management
Scholleová, Klára ; Nečaský, Martin (advisor) ; Kopecký, Michal (referee)
Title: Web application for concert database management Author: Klára Scholleová Department: Department of Software Engineering Supervisor: doc. Mgr. Martin Nečaský, Ph.D., Department of Software Enginee- ring Abstract: The aim of the thesis is to develop a web application for concert da- tabase management to be used in the Czech Chamber Philharmonic Orchestra Pardubice. The application will allow the orchestra workers to add records of concerts played (and their details), displaying the data in the database, showing the records based on filters, and data aggregation in a user friendly interface. Based on the analysis of the client's requirements, a conceptual model of the database was made. The application is implemented in a web development fra- mework Django in conjunction with other technologies (HTML, CSS, JavaScript and Vue.js library) and is prepared for further development in the future. The application was tested from aspects of both user experience and performance. Keywords: web application, concert database, Django, Vue.js 1
Graph data visualizations with D3.js libraries
Vancák, Vladislav ; Nečaský, Martin (advisor) ; Helmich, Jiří (referee)
Data visualisations help us process large volumes of complex data faster. The goal of this thesis is to implement visualizer plugins into the Linked Pipes Visualization Assistant - a platform for visualising graph data pub- lished in the RDF format. The Assistant automatically analyses data sources and matches them against available visualizers to create interactive views. All visualizers allow configuring the visualisation, saving the configuration and publishing created views. The first group of visualizers works with time- oriented data, viewing instants and intervals on a timeline chart. The second group of visualizers views map-oriented data on the Google Maps. Resources with coordinates are visualised using markers, while resources with coordi- nates and quantifiers are shown as circles (the circle radius corresponds to the quantifier). 1
Extension of RDF data analysis and visualization framework architecture and visualization plugins
Kudláček, Ondřej ; Klímek, Jakub (advisor) ; Nečaský, Martin (referee)
This extension of Payola framework focuses on user experience. Payola is a web application which allows to visualize Linked Data via its visual plugins. The data can be displayed as graphs, tables, etc. Payola also allows to construct analysis using SPARQL language and browse the analyzed data structures without any need of deep knowledge of SPARQL. The extension is placed between the Payola server and users web browser to increase the visual plugins responsiveness.
Cloud database for soil information
Andreeva, Olga ; Nečaský, Martin (advisor) ; Tůma, Petr (referee)
Title: Cloud database for soil information Author: Olga Andreeva Department: Department of Software Engineering Supervisor: doc. Mgr. Martin Nečaský, Ph.D., Department of Software Engi- neering Abstract: The mere presence of scientific data is not enough. Reliable storage and ease of publication critically contribute to the data's usefulness. The Africa Soil Information Service's mission is to describe and understand Africa's soil and landscape resources. To ensure its accomplishment the introduc- tion of modern information technologies is essential - they provide the necessary means to safely store, easily share and analyse the information collected from soil samples and drone imagery. In the presented work we develop a system that will tackle one part of the problem - how to store the information extracted from soil samples. The current method that is employed by scientists consists of making a record on paper by hand in one of the books in the laboratory's storage room. Such system, of course, does not allow to easily share the data, it is prone to damages (e.g. in case of _re) and leaves little room for analysis (especially using methods from machine learning, which require a large set of digital data). By contrast our system, developed in the form of a web application, stores soil information in the...
Presentation layer and interface for a system for information integration and search
Hladík, Tomáš ; Nečaský, Martin (advisor) ; Peška, Ladislav (referee)
The aim of this thesis is to analyse, design and implement a system to present business objects. These objects are accessible through an existing RESTful API of an integration system. The system combines various sources and publishes them together with information how these data are stored. The task of the thesis is to create data views that meet the following requirements - they can react to metadata changes, they support multiple output formats and these views can be customized. The application should be easily modifiable and connectable to already existing web systems.
Web System for Crowdfunding Based on Selling Items with Custom Imprint
Škvařil, Jan ; Parízek, Pavel (advisor) ; Nečaský, Martin (referee)
The aim of this thesis was to design and implement a web system for organization of crowdfunding campaigns that are based on the sale of items with custom imprint. The implemented system automates and facilitates the whole campaign lifecycle from the design of the imprint in an integrated editor through campaign evaluation up to the distribution of final products to customers. Therefore, there is a minimum number of points where the administrator's action is required. Part of the implementation was also seamless integration with external services like on-line payments, printing house, and social networks. Powered by TCPDF (

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