Karel Ježek


Phone:  +420 377632475, 377632400
E-mail: jezek_ka@kiv.zcu.cz
WWW: http://www-kiv.zcu.cz/~jezek_ka/

1964 MSc. in El.Eng. Pilsen. From 1964 at Dept. of Cybernetics (Pilsen). 1981 PhD in Comp.Sc. Prague. 1988 - 1990 assoc. prof. at Dept. of Comp. Sc. and Eng. (Pilsen). 1990 - 1992 deputy of Federal Assembly. 1993 - 2008 head of Comp. Sc. and Eng. Dept. Now prof. at CS&E Dept.

Research interests: Theory of formal languages and compilers, operating systems theory, programming languages, database and knowledge-base systems. Recently he is interested in Web mining and text mining problems as a coordinator of the national research project COT-SEWing (Complex Knowledge Base Tools for Natural Language Communication with the Semantic Web). Program committee member (ISIM, DATASEM, Znalosti, ELPUB conferences). Member of ACM, IEEE Comp. Soc., scientific councils of faculty, commission for state examination and PhD defence at TU Prague.

Publications:


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Publication

Automatic tagging based on Linked Data

Authors:  Martin Dostal, Karel Ježek
Source:IEEE International Conference on Service-Oriented Computing and Applications (SOCA 2010), 13-15 Dec. 2010, Perth, WA; ISBN: 978-1-4244-9802-4.
Publication

Evaluation Measures for Text Summarization

Authors:  Josef Steinberger, Karel Ježek
Source:In Computing and Informatics, volume 28 (2009), number 2, pages 251-275, Slovak Academy of Sciences, ISSN 1335-9150.
ISSN:1335-9150
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Publication

SUTLER: Update Summarizer Based on Latent Topics

Authors:  Josef Steinberger, Karel Ježek
Source:In Proceedings of TAC'08, NIST, Gaithersburgh, United States, 2009.
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Publication

Text Summarization: An Old Challenge and New Approaches

Authors:  Josef Steinberger, Karel Ježek
Source:Foundations of Computational Intelligence Vol.6, pages 127- 149, Data Mining Book Series, Springer 2009, ISSN 1860-949X, ISBN 978-3-642-01090-3
ISSN:1860-949X
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Publication

Update Summarization Based on Latent Semantic Analysis

Authors:  Josef Steinberger, Karel Ježek
Source:In Proceedings of 12th International Conference, TSD 2009, Pilsen, Czech Republic, September 2009. LNAI 5729, Springer-Verlag Berlin Heidelberg New York, ISBN 978-3-642-04207-2, ISSN 0302-9743.
ISSN:0302-9743
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Publication

Update Summarization Based on Novel Topic Distribution

Authors:  Josef Steinberger, Karel Ježek
Source:In Proceedings of the 2009 ACM Symposium on Document Engineering, Munich, Germany, September 2009. Association for Computing Machinery, ISBN 978-1-60558-575-8.
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Publication

Automatic Text Summarization (The state of the art 2007 and new challenges)

Authors:  Karel Ježek, Josef Steinberger
Source:In Proceedings of Znalosti 2008, Bratislava, Slovakia, February 2008, pp. 1–12, ISBN 978-80-227-2827-0.
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Publication

Exploration and Evaluation of Citation Networks

Authors:  Karel Ježek, Dalibor Fiala, Josef Steinberger
Source:Proceedings of the 12th International Conference on Electronic Publishing, ISBN 978-0-7727-6315-0, pp 351-362, Toronto, Canada 2008
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Publication

Multilingual Plagiarism Detection

Authors:  Zdeněk Češka, Michal Toman, Karel Ježek
Source:Artificial Intelligence: Methodology, Systems, and Applications, LNCS/LNAI 5253, pp. 83-92, Springer-Verlag Berlin Heidelberg, the 13th International Conference on Artificial Intelligence: Methodology, Systems, Applications (AIMSA 2008), Varna, Bulgaria, September 2008. ISSN 0302-9743. ISBN 978-3-540-85775-4.
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Publication

Web Topic Summarization

Authors:  Josef Steinberger, Karel Ježek, Martin Sloup
Source:Proceedings of the 12th International Conference on Electronic Publishing, ISBN 978-0-7727-6315-0, pp 322-334, Toronto, Canada 2008
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Publication

Two Uses of Anaphora Resolution in Summarization

Authors:  Josef Steinberger, Massimo Poesio, Mijail Alexandrov Kabadjov, Karel Ježek
Source:In Special Issue of Information Processing & Management on Summarization, volume 43, issue 6, November 2007, Elsevier Ltd., pp. 1663-1680. ISSN 0306-4573.
ISSN:0306-4573
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Publication

Extending the Single Words-Based Document Model: A Comparison of Bigrams and 2-Itemsets

Authors:  Roman Tesař, Massimo Poesio, Václav Strnad, Karel Ježek
Source:The 2006 ACM Symposium on Document Engineering(DocEng’06), Amsterdam, Netherlands, ACM press (New York, NY, USA), ISBN 1-59593-515-0, pages 138-146.
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Publication

Extracting Information from Web Content and Structure

Authors:  Dalibor Fiala, Roman Tesař, Karel Ježek, François Rousselot
Source:Proc. 9th Int. Conf. on Information Systems Implementation and Modelling ISIM’06, Přerov, Czech Republic, pp. 133-140, 2006.
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Publication

Influence of Word Normalization on Text Classification

Authors:  Michal Toman, Roman Tesař, Karel Ježek
Source:InSciT 2006, Proceeding of Multidisciplinary Approaches to Global Information Systems, vol II, Merida, Spain
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Publication

Searching and Summarizing in Multilingual Environment

Authors:  Michal Toman, Josef Steinberger, Karel Ježek
Source:In Proceedings of the 10th International Conference on Electronic Publishing, Bansko, Bulgaria, June 2006, pp. 257-265, FOI-Commerce, ISBN 954-16-0049-9.
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Publication

Sentence Compression for the LSA-based Summarizer

Authors:  Josef Steinberger, Karel Ježek
Source:In Proceedings of the 7th International Conference on Information Systems Implementation and Modelling, Přerov, Czech Republic, April 2006, pp. 141-148, MARQ Ostrava, ISBN 80-86840-19-0.
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Publication

A comparison of two algorithms for discovering repeated word sequences

Authors:  Roman Tesař, Dalibor Fiala, François Rousselot, Karel Ježek
Source:The 6th International Conference on Data Mining, Text Mining and their Business Applications (Data Mining 2005), Skiathos, Greece, ISBN 1-84564-017-9, pages121-131, WIT Transaction on Information and Communication Technologies, ISSN 1743-3517.
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Publication

Documents Categorization in Multilingual Environment

Authors:  Karel Ježek, Michal Toman
Source:ElPub2005, pp.97-104, Leuven, Belgium 2005, Peeters Publishing, ISBN 90-429-1645-1
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Publication

In Czech: Modifikace bayesovského disambiguátoru

Authors:  Michal Toman, Karel Ježek
Source:Znalosti 2005, Stará Lesná, Slovensko
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Publication

A Web-Based User-Profile Generator: Foundation for a Recommender and Expert Finding System

Authors:  Petr Grolmus, Jiří Hynek, Karel Ježek
Source:Proceedings of the 8th ICCC International Conference on Electronic Publishing, Universidade of Brasília - UnB, Brazil, ISBN 85-88130-02-05
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Publication

Text Summarization and Singular Value Decomposition

Authors:  Josef Steinberger, Karel Ježek
Source:Proceedings the 3rd International Conference on Advances in Information Systems, Lecture Notes in Computer Science 2457, October 2004, pp. 245–254, Springer-Verlag Berlin Heidelberg, ISSN 0302-9743, ISBN 3-540-23478-0.
ISSN:0302-9743
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Publication

Using Latent Semantic Analysis in Text Summarization and Summary Evaluation

Authors:  Josef Steinberger, Karel Ježek
Source:In Proceedings of the 5th International Conference on Information Systems Implementation and Modelling, Rožnov p. Radhoštěm, Czech Republic, April 2004, pp. 93–100, MARQ Ostrava, ISBN 80-85988-99-2.
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Publication

In Czech: Kategorizace textů metodou NBCI

Authors:  Martin Kučera, Karel Ježek, Jiří Hynek
Source:Proceedings of the 2nd Annual Conference Znalosti 2003, Czech Republic. Vojtěch Svátek (Ed). VŠB-Technická univerzita Ostrava, Czech Republic, ISBN 80-248-0229-5
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Publication

User Profile Identification Based on Text Mining

Authors:  Petr Grolmus, Jiří Hynek, Karel Ježek
Source:Proceedings of 6th International Conference on Information Systems Implementation and Modelling – ISIM ‘03 Brno, Czech Republic. Miroslav Beneš (Ed.). MARQ, Czech Republic, ISBN 80-85988-84-4
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Publication

Magic Sets Method with Fuzzy Logic

Authors:  Martin Zíma, Karel Ježek
Source:Proceedings of the 2nd International Conference on Advances in Information Systems (ADVIS 2002), October 2002, Izmir, Turkey, LNCS 2457, pp. 83-92, ISBN 978-3-540-00009-9, doi: 10.1007/3-540-36077-8_8
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Publication

Use of Text Mining Methods in a Digital Library

Authors:  Jiří Hynek, Karel Ježek
Source:Proceedings of the Sixth International Conference on Electronic Publishing – elpub2002 Karlovy Vary, Czech Republic, Joao A. Carvalho, Arved Hübler, Anna A. Baptista (Eds). Verlag für Wissenschaft und Forschung Berlin, Germany, ISBN 3-897-0035
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Publication

Document Classification Using Itemsets

Authors:  Jiří Hynek, Karel Ježek
Source:Proceedings of 34th Spring International Conference MOSIS 2000, Rožnov pod Radhoštěm, Czech Republic, J. Zendulka (Ed.). MARQ, Czech Republic, ISBN 80-85988-45-3
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Publication

Short Document Categorization - Itemsets Method

Authors:  Jiří Hynek, Karel Ježek, Ondřej Rohlík
Source:Proceedings of the Annual Conference PKDD 2000 Workshops, Lyon, France
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Publication

Author ranking based on personalized PageRank

Authors:  Michal Nykl, Michal Campr, Karel Ježek
Source:Journal of Informetrics. 9(4), pp.777-799, 2015.
ISSN:1751-1577
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Publication

Comparing Semantic Models for Evaluating Automatic Document Summarization

Authors:  Michal Campr, Karel Ježek
Source:Campr M, Ježek K. Comparing Semantic Models for Evaluating Automatic Document Summarization. In proceedings of Text, Speech, and Dialogue 2015. Springer 2015 Lecture Notes in Computer Science, LNAI 9302 p. 252–260.
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Publication

Contrastive Summarization: Comparing Opinions of Czech Senators

Authors:  Michal Campr, Karel Ježek
Source:CAMPR, M., JEŽEK, K.: Contrastive Summarization: Comparing Opinions of Czech Senators. Journal of Theoretical and Applied Information Technology 77(1) (2015) 62–68
ISSN:1992-8645
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Publication

Exploration of Document Classification with Linked Data and PageRank

Authors:  Martin Dostal, Michal Nykl, Karel Ježek
Source:Intelligent Distributed Computing VII, Studies in Computational Intelligence 511, 2014, pp 37-43. ISSN:1860-949X, ISBN:978-3-319-01570-5.
ISSN:1860-949X
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Publication

Semantic analysis of software specifications with Linked Data

Authors:  Martin Dostal, Michal Nykl, Karel Ježek
Source:Journal of Theoretical and Applied Information Technology (JATIT 2014), vol. 67, no. 2, pp. 368-376. ISSN: 1992-8645, E-ISSN: 1817-3195.
ISSN:1992-8645
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Publication

Cluster labeling with Linked Data

Authors:  Martin Dostal, Karel Ježek, Michal Nykl
Source:Journal of Theoretical and Applied Information Technology (JATIT 2013), ISSN: 1992-8645, E-ISSN: 1817-3195.
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Publication

Comparative Summarization via Latent Dirichlet Allocation

Authors:  Michal Campr, Karel Ježek
Source:Dateso 2013, pp. 80–86, ISBN 978-80-248-2968-5
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Publication

Determining Compositionality of Word Expressions Using Various Word Space Models and Measures

Authors:  Lubomír Krčmář, Karel Ježek, Pavel Pecina
Source:Proceedings of the Workshop on Continuous Vector Space Models and their Compositionality (ACL), pp. 64-73, 2013, ISBN 978-1-937284-67-1
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Publication

Determining Compositionality of Word Expressions Using Word Space Models

Authors:  Lubomír Krčmář, Karel Ježek, Pavel Pecina
Source:Proceedings of the 9th Workshop on Multiword Expressions (NAACL), pp. 42-50, 2013, ISBN 978-1-937284-47-3
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Publication

Linked Data and PageRank based classification

Authors:  Martin Dostal, Michal Nykl, Karel Ježek, Dalibor Fiala
Source:Proceedings of IADIS International Conference Theory and Practice in Modern Computing 2013 (part of MCCSIS 2013). Praha: IADIS Press, 2013, pp. 61-64, ISBN: 978-972-8939-94-6.
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Publication

Semantic Markup for Web Applications

Authors:  Martin Dostal, Dalibor Fiala, Karel Ježek
Source:Proceedings of the International Conference on Computer, Communication, Information Sciences, and Engineering (ICCCISE 2013), Paris, France, pp. 506 - 509, 2013. World Academy of Science, Engineering and Technology, vol. 76, April 2013. ISSN: 2010-376X.
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Publication

Topic models for comparative summarization

Authors:  Michal Campr, Karel Ježek
Source:Text, Speech, and Dialogue - 16th International Conference, TSD 2013, Pilsen, Czech Republic, September 1-5, 2013. Proceedings. Springer 2013 Lecture Notes in Computer Science ISBN 978-3-642-40584-6
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Publication

Comparative Summarization via Latent Semantic Analysis

Authors:  Karel Ježek, Michal Campr
Source:Latest Trends in Information Technology, pp. 279-284, ISBN 978-1-61804-134-0, 2012
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Publication

Detection of Semantic Compositionality Using Semantic Spaces

Authors:  Lubomír Krčmář, Karel Ježek, Massimo Poesio
Source:Text, Speech and Dialogue, LNCS, vol. 7499, pp. 353-361, ISBN 978-3-642-32789-6, 2012.
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Publication

In Czech: Varianty použití PageRanku pro citační analýzu

Authors:  Michal Nykl, Karel Ježek
Source:Datakon 2012, pp. 87-97, ISBN 978-80-553-1049-7, 2012.
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Publication

In Czech: Volba vlastností s využitím Linked Data

Authors:  Martin Dostal, Karel Ježek
Source:Proceedings of the Datakon 2012, pp. 77-87, ISBN 978-80-553-1049-7, 2012.
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Publication

Automatic keyphrase extraction based on NLP and statistical methods

Authors:  Martin Dostal, Karel Ježek
Source:Proceedings of the Dateso 2011, April 20-22, pp. 140-145, ISBN 978-80-248-2391-1. CEUR WS Proceedings, vol. 706, pp.140-146, ISSN 1613-0073
Publication

Exploration of Semantic Spaces Obtained from Czech Corpora

Authors:  Lubomír Krčmář, Karel Ježek, Miloslav Konopík
Source:Proceedings of the Dateso 2011, April 20-22, pp. 97-107, ISBN 978-80-248-2391-1. CEUR WS Proceedings, vol. 706, pp.97-107, ISSN 1613-0073
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Publication

PageRank and analysis of citation cycles

Authors:  Petr Heller, Michal Nykl, Karel Ježek
Source:ITAT 2011: Zborník príspevkov prezentovaných na konferencii ITAT. Vrátná dolina, Slovensko, 2011. ISBN 978-80-89557-01-1
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Publication

In Czech: Extrakce informací z emailů typu Call for papers

Authors:  Martin Dostal, Karel Ježek, Lubomír Krčmář
Source:ITAT 2010, Informačné technológie – Aplikácie a Teória,Zborník príspevkov prezentovaných na konferencii ITAT, september 2010, ISBN 978-80-970179-3-4.
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Publication

In Czech: Sumarizace textů

Authors:  Karel Ježek, Josef Steinberger
Source:Proceedings of Annual Database Conference DATAKON, October 16-19, 2010, Mikulov, Czech Rep., pp.3-23, ISBN 978-80-7368-424-2
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Publication

Translation of XML Documents into Logic Programs

Authors:  Martin Zíma, Karel Ježek
Source:Proceedings of the 14th International Conference on Electronic Publishing, June 2010, pp. 351-362, Helsinki, Finland, ISBN 978-952-232-086-5
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Publication

Extended Formal Model for Ranking of Authoritative Resources

Authors:  Karel Ježek
Source:Proccedings XXII Mezdunarodnoj Naucnoj Konferencii MMTT-22, ISBN 978-5-91116-087-2 (Tom 7), pp.193-195, Pskov 2009.
Publication

In Czech: Rozšíření bag-of-words modelu dokumentu: srovnání bigramů a 2-itemsetů

Authors:  Roman Tesař, Massimo Poesio, Václav Strnad, Karel Ježek
Source:In Proceedings of Znalosti 2007 Conference, Ostrava, Czech Republic, pp. 131-142, ISBN 978-80-248-1279-3, February 2007.
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Publication

In Czech: Využití struktury webu pro vyhledávání autoritativních institucí a osob

Authors:  Dalibor Fiala, Karel Ježek, François Rousselot
Source:Proc. 6th Annual Conf. ZNALOSTI 2007, Ostrava, Czech Republic, pp. 300-303, 2007.
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Publication

Ranking Algorithms For Web Sites: Finding Authoritative Academic Web Sites and Researchers

Authors:  Dalibor Fiala, François Rousselot, Karel Ježek
Source:Proc. 3rd Int. Conf. Web Information Systems and Technologies WEBIST'07, Barcelona, Spain, pp. 372-375, 2007.
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Publication

The Fight against Spam - A Machine Learning Approach

Authors:  Karel Ježek, Jiří Hynek
Source:Proceedings of the 11th International Conference on Electronic Publishing, Vienna, Austria, ISBN 978-3-85437-292-9
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Publication

Finding Authoritative Researchers on Academic Web Sites

Authors:  Dalibor Fiala, Karel Ježek, François Rousselot
Source:Proc. CISE'06, Cairo, Egypt, Enformatika Transactions on Engineering, Computing and Technology, Vol. 17, pp. 74-79, 2006.
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Publication

In Czech: Hodnocení kvality sumarizátorů textů

Authors:  Josef Steinberger, Karel Ježek
Source:In Proceedings of Znalosti 2005 Conference, Stará Lesná, Slovakia, February 2005, pp. 96–107, ISBN 80-248-0755-6.
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Publication

In Czech: Klasifikace Suffix Tree frázemi - srovnání s metodou Itemsets

Authors:  Roman Tesař, Karel Ježek
Source:Znalosti 2005 conference, Stará Lesná, Slovakia, ISBN 80-248-0755-6, pages 144-153.
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Publication

In Czech: Klasifikace multilinguálních korpusů s využitím tezauru EuroWordNet

Authors:  Michal Toman, Karel Ježek
Source:Proceedings of ITAT 2003, Slovensko, pp 129-138, ISBN-80-7097-589-X
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Publication

Retrieving Citations on the Web

Authors:  Dalibor Fiala, Karel Ježek
Source:Proc. Int. Conf. on Knowledge Engineering and Decision Support ICKEDS’04, Porto, Portugal, pp. 481-488, 2004.
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Publication

A Practical Approach to Automatic Text Summarization

Authors:  Jiří Hynek, Karel Ježek
Source:Proceedings of the 7th ICCC/IFIP International Conference on Electronic Publishing – ELPUB2003 Guimaraes, Portugal, Sely Costa et al. (Eds). Universidade de Minho, Portugal, ISBN 972-98921-2-1
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Publication

In Czech: Vyhledávání častých frází pro generování uživatelských profilů

Authors:  Petr Grolmus, Jiří Hynek, Karel Ježek
Source:Proceedings of 3rd International Conference on Information Technologies – Applications and Theory – ITAT 2003, Sliezsky dom, Slovakia. Peter Vojtáš (Ed.), Slovakia, ISBN 80-7097-564-4
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Publication

In Czech: Automatická klasifikace dokumentů do tříd za použití metody Itemsets

Authors:  Jiří Hynek, Karel Ježek
Source:Proceedings of the Annual Database Conference, Datakon 2001 Brno, Czech Republic, Mária Bieliková (Ed.), ISBN 80-227-1597-2
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Projects:


Project

Automatic Text Summarisation

Authors:  Josef Steinberger, Karel Ježek, Michal Campr, Jiří Hynek
Desc.:Automatic text summarisation using various text mining methods, mainly Latent Semantic Analysis (LSA).
Project

Document Clustering and Linked Data

Authors:  Karel Ježek, Martin Dostal
Desc.:Unsupervised methods for automatic tagging and clustering based on information extraction from Linked data.
Project

Exploration of Semantic Spaces

Authors:  Karel Ježek, Lubomír Krčmář, Miloslav Konopík
Desc.:This work is focused on semantic relations between words and application of these relations in research fields such as information retrieval, machine translation or document clustering.
Project

Knowledge Extraction from Texts

Authors:  Karel Ježek, Martin Zíma
Desc.:This work is focused to obtain facts via extraction the latent information from XML documents and its processing via logic program.
Project

Social Networks Analysis

Authors:  Karel Ježek, Dalibor Fiala, Michal Nykl
Desc.:Application of PageRank algorithm and its modifications on exploration of network structures, particularly citation and coautorship networks.
Project

Document Classification

Authors:  Jiří Hynek, Karel Ježek, Michal Toman, Roman Tesař, Zdeněk Češka, Petr Grolmus
Desc.:Use of inductive machine learning methods in classification of short text documents.
Project

Extracting Information from Web Content and Structure

Authors:  Dalibor Fiala, Roman Tesař, Karel Ježek
Desc.:This project deals with classification of Web documents and determination of authoritative Web sites. It was supported in part by the Ministry of Education of the Czech Republic under grant FRVS 1347/2005/G1.
Project

Internet Content Filtering

Authors:  Roman Tesař, Karel Ježek
Desc.:This project includes Web sites processing, analyzing, classification by means of their content and searching for other Web sites with similar content.
Project

Searching and Summarizing in Multilingual Enviroment

Authors:  Josef Steinberger, Karel Ježek, Michal Toman
Desc.:The project includes multilingual searching in text databases and an automatic summarization of retrieved texts. It was supported in part by the Ministry of Education of the Czech Republic under grant FRVS 1326/2005/G1.
Project

User Profile Mining, Social Networks

Authors:  Jiří Hynek, Petr Grolmus, Karel Ježek
Desc.:Identification of user profiles based on users' behavior on the web. Practical applications in various knowledge and information management projects.