Petr Kremen

Petr Kremen
Czech Technical University in Prague | ČVUT · Faculty of Electrical Engineering (FEL)

Dr.

About

45
Publications
8,519
Reads
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337
Citations
Citations since 2016
21 Research Items
216 Citations
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Introduction
Petr Kremen currently works at the Faculty of Electrical Engineering (FEL), Czech Technical University in Prague. Petr does research in Semantic Web, Ontologies and Information Systems. Previously, he was a lead at Babylon Partners, Ltd. of the Knowledge Base Team.

Publications

Publications (45)
Preprint
Full-text available
Information systems with complex domain logic could tremendously benefit from incorporating Semantic Web technologies and principles, be it globally relevant identifiers, Linked Data, or expressive reasoning to name just a few. While some of the Semantic Web principles may be applied on top of regular information systems backed by relational databa...
Chapter
Ontology learning from a text written in natural language is a well-studied domain. However, the applicability of techniques for ontology learning from natural language texts is strongly dependent on the characteristics of the text corpus and the language used. In this paper, we present our work so far in entity linking and enhancing the ontology w...
Preprint
Full-text available
Many organizations already benefit from using semantic vocabularies which help them systematize, search and reuse their data. However, to efficiently manage such vocabularies, appropriate and adequate tools are needed. In this paper, we present TermIt, an integrated system for managing a set of interconnected vocabularies, identification of individ...
Article
Domain-independent information systems like ontology editors provide only limited usability for non-experts when domain-specific linked data need to be created. On the contrary, domain-specific applications require adequate architecture for data authoring and validation, typically using the object-oriented paradigm. So far, several software librari...
Conference Paper
Many organizations already benefit from using semantic vocabularies which help them systematize, search and reuse their data. However, to efficiently manage such vocabularies, appropriate and adequate tools are needed. In this paper, we present TermIt, an integrated system for managing a set of interconnected vocabularies, identification of individ...
Chapter
Full-text available
Ontologies can represent a significant asset of domain-specific information systems, written predominantly using the object-oriented paradigm. However, to be able to work with ontological data in this paradigm, a mapping must ensure transformation between the ontology and the object world. While many software libraries provide such a mapping, they...
Preprint
Full-text available
Ontologies can represent a significant asset of domain-specific information systems, written predominantly using the object-oriented paradigm. However, to be able to work with ontological data in this paradigm, a mapping must ensure transformation between the ontol-ogy and the object world. While many software libraries provide such a mapping, they...
Preprint
Full-text available
In the age of data, enterprise-related data can be efficiently used for supporting safety management decisions. In this paper, the state of the art in the domain of aviation safety is reviewed and problems that current aviation safety information systems suffer from are identified. Based on the outcomes, ontologies are defended as a technology for...
Preprint
Full-text available
Domain-independent information systems like ontology editors provide only limited usability for non-experts when domain-specific linked data need to be created. On the contrary, domain-specific applications require adequate architecture for data authoring and validation, typically using the object-oriented paradigm. So far, several software librari...
Article
The descriptive metadata gathered by open data catalogs are often simple key-value pairs that describe provenance information, but not concepts from the domain of the described dataset. Search engines relying on such metadata cannot make use of semantic connections among datasets. In this paper, we present a Semantic Government Vocabulary that is u...
Article
In the age of data, enterprise-related data can be efficiently used for supporting safety management decisions. In this paper, the state of the art in the domain of aviation safety is reviewed and problems that current aviation safety information systems suffer from are identified. Based on the outcomes, ontologies are defended as a technology for...
Chapter
Using ontologies for enterprise data integration brings an opportunity to use them for efficient data query evaluation. The rationale is that ontologies represent common-sense structures that are reflected also in queries posed by data users and thus can be used for query optimization. This paper presents how proper foundational-ontology-based know...
Chapter
Creating domain-specific Linked Data applications is a complex endeavor as they need to work with ontological knowledge, consume/produce Linked Data and perform nontrivial business logic. In this work, we analyze several domain-specific Linked Data applications and introduce a set of features which influence the efficiency of development and mainte...
Preprint
Aviation safety data are limited in availability due to their confidential nature. Some aggregated overviews already exist but in order to effectively use the data, it is important to fill the gaps of their existing limitations. For some data, there are not enough data points in order to process them through advanced analysis. For other, only exper...
Conference Paper
Full-text available
Urban planning data are of big importance to both general public and domain experts like civil engineers, architects or urban planning specialists. Typically, the data are scattered within many datasets containing both geographical knowledge and taxonomical knowledge. Features representing same objects in two different datasets often do not have an...
Article
The European Coordination Centre for Accident and Incident Reporting Systems develops an information system for reporting aviation occurrences on the European scale. The system makes use of various taxonomies, like the taxonomy of event types, or a taxonomy of descriptive factors. However, the European Coordination Centre for Accident and Incident...
Conference Paper
Aviation is a high risk industry where safety management is mandatory for organizations. On a global scale, safety management is hierarchical, i.e. national authorities manage safety of the sector, controlling organizations which in turn manage safety of their operations, as well as the safety of their organizational units. It is apparent that safe...
Conference Paper
Last years, there has been growing interest in developing high quality models to ensure interoperability of applications as well as proper understanding among a community. To improve productivity of model designers as well as to improve quality of resulting models, proper theoretical foundations and tool support is necessary. This paper discusses s...
Conference Paper
Full-text available
Creating applications on top of linked data and ontologies brings many difficulties. The applications are either generic (and thus not appealing to end-users), or bound to ontology structure, change of which breaks the application. We present JOPA, a tool that formalizes the contract between the application and the ontology, combining advantages of...
Book
This book constitutes the refereed proceedings of the 7th International Conference on Knowledge Engineering and the Semantic Web, KESW 2016, held in Prague, Czech Republic, in September 2016. The 17 revised full papers presented together with 9 short papers were carefully reviewed and selected from 53 submissions. The papers are organized in topica...
Conference Paper
Although many applications built on top of market-ready ontology storages are generic and lack dependence on the particular application domain, most users prefer applications tailored to their particular task. Such applications are typically built using object-oriented paradigm that accesses data differently than generic applications. In this paper...
Article
Accessing OWL ontologies programmatically by complex IT systems brings many problems stemming from ontology evolution, their open-world nature and expressiveness. This paper presents Java OWL Persistence API (JOPA), a persistence layer that allows using the object-oriented paradigm for accessing semantic web ontologies. Comparing to other approache...
Conference Paper
Accessing OWL ontologies from IT systems can bring many problems unfamiliar to developers used to the more common relational storage approach. These problems stem from the dynamic nature of ontologies, their open-world character and expressiveness. In this paper, we present the Java OWL Persistence API (JOPA), a persistence layer allowing object-or...
Article
Web Ontology Language ontologies become more and more popular in complex domain modeling for their high expressiveness, flexibility and well defined semantics. Although query languages adequate in expressiveness to OWL reasoning capabilities were introduced before, their implementations are rather limited. In this paper, the authors study SPARQL-DL...
Article
Deriving from the complex nature of cultural heritage conservation and its heterogeneous tasks it is the need for enhancing a systematic but flexible organization of expert knowledge in the field. Such organization should address comprehensively the interrelations and complementariness among the different factors that come into play in the understa...
Article
Full-text available
Deriving from the complex nature of cultural heritage conservation it is the need for enhancing a systematic but flexible organization of expert knowledge in the field. Such organization should address comprehensively the interrelations and complementariness among the different factors that come into play in the understanding of diagnostic and inte...
Article
In this paper we study the distinct count aggregation function used in queries into expressive ontologies. The main differences in this settings opposed to aggregation in relational database systems are the Open World Assumption and incomplete knowledge. We propose different interpretations useful in different practical use-cases of the distinct co...
Conference Paper
Full-text available
Mindmaps have been a popular means for intuitive and user-friendly conceptual modeling for several years. This paper proposes a mindmapping tool driven by semantic web ontologies that allows to assign meanings to the mindmap nodes and, even more importantly, guide the user through mindmap creation by proposing ontological concepts and roles relevan...
Article
Conventional information systems are built on top of a relational database that requires its data model to be stable. This lack of adaptability is very restrictive for systems that manipulate evolving or heterogenous knowledge. The authors of this paper faced this issue at the time of the development of an information system of structural failures....
Conference Paper
Capturing knowledge about damages and failures of culture heritage objects is a complex task because of term ambiguity, knowledge incompleteness and variety. To tackle this complexity, the paper introduces a semantic web ontology that aims at modeling monument damage knowledge with significant contextual information, including monument identificati...
Conference Paper
Conjunctive query answering is becoming a very important task on the Semantic Web as the adoption of SPARQL query language increases. There is considerable work done in the area of optimizing conjunctive query answering for RDF and OWL2-DL ontologies, in the latter case namely for queries without undistinguished variables. However, there has not be...
Conference Paper
As the semantic web is becoming more mature, the need for complex, large, formally described ontologies grows. Developing such ontologies is rather nontrivial and complex task requiring collaboration among knowledge engineers and domain experts. To support ontology sharing we introduce OWLDiff, an OWL 2 ontology comparison/merge tool, its algorithm...
Article
Full-text available
The problem addressed in this paper is the challenge of automated construction of knowledge discovery workflows, given the types of inputs and the required outputs of the knowledge discovery process. Our methodology consists of two main ingredients. The first one is defining a formal conceptualization of knowledge types and data mining algorithms b...
Conference Paper
In this contribution we show, how we could overcome the shortcomings of the Topic-Map representation by applying our developed transformation concept for the particular system VCEDECIS. At a passive decision support system using Topic Maps as a semantic technology for representing its knowledge, it was decided to transform the knowledge representat...
Chapter
Explanations of modeling errors in ontologies are of crucial importance both when creating and maintaining the ontology. This work presents two novel incremental methods for error explanations in semantic web ontologies and shows their advantages w.r.t. the state of the art black-box techniques. Both promising techniques together with our implement...
Conference Paper
Full-text available
Contemporary product design based on 3D CAD tools aims at improved efficiency using integrated engineering environments with access to databases of existing designs, associated documents and en- terprise resource planning (ERP). One of the goals of the SEVENPRO project is to achieve design process improvements through the utilization of relational...
Article
Full-text available
The paper suggests a methodology for search of temporal patterns, which is tested on the problem of difference between hepati-tis B and C. To reach this goal two software systems LISp-Miner and SumatraTT are combined – sophisticated data transformations and en-hancements are designed and ensured through SumatraTT while LISp-Miner takes care for the...
Article
Recently, SPARQL-DL was introduced in [7] as a rich query language for OWL-DL ontologies. It provides an OWL-DL-like semantics for SPARQL basic graph patterns which involves as special cases both conjunctive ABox queries and mixed TBox/RBox/ABox queries over De-scription Logic (DL) ontologies. This paper describes the implementation of a SPARQL-DL...
Article
Full-text available
This paper addresses the problem of semi-automatic design of workflows for complex knowledge discovery tasks. Assembly of opti-mized knowledge discovery workflows requires awareness of and exten-sive knowledge about the principles and mutual relations between diverse data processing and mining algorithms. We aim at alleviating this burden by automa...

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Projects

Projects (2)
Project
The goal of the project is to support the process of creation of quality ontological data using information systems. To create a methodology, a formal aparatus and a prototypical implementation enabling effective management of ontological data using information systems, emphasizing the quality, consistency and efficiency of creation of the data.
Archived project