Lecture Notes in Artificial Intelligence 7297 Subseries of Lecture Notes in Computer Science LNAISeriesEditors RandyGoebel UniversityofAlberta,Edmonton,Canada YuzuruTanaka HokkaidoUniversity,Sapporo,Japan WolfgangWahlster DFKIandSaarlandUniversity,Saarbrücken,Germany LNAIFoundingSeriesEditor JoergSiekmann DFKIandSaarlandUniversity,Saarbrücken,Germany Ilias Maglogiannis Vassilis Plagianakos Ioannis Vlahavas (Eds.) Artificial Intelligence: Theories and Applications 7th Hellenic Conference on AI, SETN 2012 Lamia, Greece, May 28-31, 2012 Proceedings 1 3 SeriesEditors RandyGoebel,UniversityofAlberta,Edmonton,Canada JörgSiekmann,UniversityofSaarland,Saarbrücken,Germany WolfgangWahlster,DFKIandUniversityofSaarland,Saarbrücken,Germany VolumeEditors IliasMaglogiannis VassilisPlagianakos UniversityofCentralGreece DepartmentofComputerScienceandBiomedicalInformatics 2-4PapassiopoulouStreet,Lamia35100,Greece E-mail:{imaglo,vpp}@ucg.gr IoannisVlahavas AristotleUniversityofThessaloniki DepartmentofInformatics Thessaloniki54124,Greece E-mail:[email protected] ISSN0302-9743 e-ISSN1611-3349 ISBN978-3-642-30447-7 e-ISBN978-3-642-30448-4 DOI10.1007/978-3-642-30448-4 SpringerHeidelbergDordrechtLondonNewYork LibraryofCongressControlNumber:2012937659 CRSubjectClassification(1998):I.2,F.1,I.4,J.3,I.5,H.3-4,H.2.8 LNCSSublibrary:SL7–ArtificialIntelligence ©Springer-VerlagBerlinHeidelberg2012 Thisworkissubjecttocopyright.Allrightsarereserved,whetherthewholeorpartofthematerialis concerned,specificallytherightsoftranslation,reprinting,re-useofillustrations,recitation,broadcasting, reproductiononmicrofilmsorinanyotherway,andstorageindatabanks.Duplicationofthispublication orpartsthereofispermittedonlyundertheprovisionsoftheGermanCopyrightLawofSeptember9,1965, initscurrentversion,andpermissionforusemustalwaysbeobtainedfromSpringer.Violationsareliable toprosecutionundertheGermanCopyrightLaw. 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Typesetting:Camera-readybyauthor,dataconversionbyScientificPublishingServices,Chennai,India Printedonacid-freepaper SpringerispartofSpringerScience+BusinessMedia(www.springer.com) Preface Itisourpleasuretowelcomeyoutotheproceedingsofthe7thHellenicConference on Artificial Intelligence (SETN 2012) held during May 28–31, 2012, in Lamia, Greece.SETN2012wasorganizedbytheHellenicAISociety(EETN),incollab- orationwiththeDepartmentofComputerScienceandBiomedicalInformaticsof theUniversityofCentralGreece.PreviousconferenceswereheldattheUniversity ofPiraeus(1996),atthe AristotleUniversityofThessaloniki(2002),atthe Uni- versityof the Aegean(Samos,2004,and Syros,2008),jointly atthe Foundation forResearchandTechnologyHellas(FORTH)andtheUniversityofCrete(2006), andatNCSR“Demokritos”(2010). SETN conferences have already been established as the most prominent fo- rums for Greek and international AI scientists to present original and high- quality research on emergent topics of artificial intelligence. The SETN 2012 conference aimed to: (cid:129) Bring together researchers who work actively in the field of artificial intelli- gence,tosupporttheexchangeofopinionsandtheformationofnewresearch groups and collaborations (cid:129) Disseminate original and highly qualitative results of the Greek AI commu- nity and Greek research labs, fostering international collaborations (cid:129) Informundergraduateand postgraduatestudents about the currentstate of affairs of AI researchas conducted by scientists in Greece and worldwide (cid:129) Promote research results to companies and facilitate the development of innovative products The task of the Technical ProgramCommittee was very challenging putting together a program containing 48 high-quality contributions out of 81 submis- sions. The collection of papers included in the proceedings offer stimulating in- sights into emerging AI fields and describe advanced methodologies, systems, tools and techniques. The SETN conference series allows and encourages inter- national participation and the language of the conference is English. Thus, this year the conference proceedings include papers from Germany, Belgium, USA and Taiwan. FiveSpecialSessionsdedicatedtospecificAIfieldswerealsoaffiliatedwithin the SETN 2012 conference: (cid:129) Advancing Translational Biological Research Through the Incorporation of ArtificialIntelligenceMethodologies(AristotelisChatziioannou,NationalHel- lenicResearchFoundation,AnastasiosBezerianos,UniversityofPatras,and Konstantina Nikita, National Technical University of Athens) (cid:129) Artificial Intelligence in Bioinformatics (Pantelis Bagos, University of Cen- tral Greece) (cid:129) IntelligentAnnotationof DigitalContent(Dimitris K.Iakovidis,Technolog- ical Educational Institute of Lamia) VI Preface (cid:129) Affective andNaturalInterfaces(GeorgeCaridakis,NationalTechnicalUni- versityofAthens,KostasKarpouzis,NationalTechnicalUniversityofAthens, and Panagiotis Bamidis, Aristotle University of Thessaloniki) (cid:129) Unified Multimedia Knowledge Representation and Processing (Evaggelos Spyrou,TechnologicalEducationalInstituteofLamia,ManolisWallace,Uni- versityofPeloponnese,PhivosMylonas,IonianUniversity,andIoannisAnag- nostopoulos, University of Central Greece) The wide range of topics and high level of contributions guaranteed a very successful conference. We express our special thanks to all who contributed to the organization and scientific content of this conference. First to the authors of the papers, then to the special session organizersand finally to the reviewers and members of the Program and Organizing Committees. Last but not least, wealsothankAlfredHofmann,FrankHolzwarth,AnnaKramer,ChristineReiss, and the rest of the Springer team for their continuous help and support. May 2012 Ilias Maglogiannis Vassilis Plagianakos Ioannis Vlahavas Organization SETN 2012 was organized by the Hellenic AI Society (EETN), in collaboration with the Department of Computer Science and Biomedical Informatics of the University of Central Greece. Committees Program Chairs Ilias Maglogiannis University of Central Greece Vassilis Plagianakos University of Central Greece Ioannis Vlahavas Aristotle University of Thessaloniki (EETN President) Steering Committee Constantine D. Spyropoulos NCSR“Demokritos”(SETN 2010 Co-chair) George Vouros University of Piraeus,EETN President (SETN 2004 Co-chair) Grigoris Antoniou FORTH and University of Crete (SETN 2006 Chair) Ioannis Vlahavas Aristotle University (SETN 2002 Chair) John Darzentas University of the Aegean (SETN 2008 Chair) Nikos Fakotakis University of Patras (ECAI 2008 Chair) Themistoklis Panayiotopoulos University of Piraeus (SETN 2004 Co-chair) Vangelis Karkaletsis NCSR“Demokritos”(SETN 2010 Co-chair) Program Committee Aristotelis Chatziioannou NHRF Grigoris Antoniou University of Crete Grigorios Beligiannis University of Ioannina Stavros Karkanis TechnologicalEducational Institute of Lamia Theodoros Soldatos AIT Demosthenes Vouyioukas University of the Aegean Nikos Papamarkos Democritus University of Thrace Michail Lagoudakis Technical University of Crete George Caridakis NTUA Basilis Gatos NCSR“Demokritos” KyriakosSgarbas University of Patras Achilles Kameas Hellenic Open University Katerina Kabassi TEI Ionian VIII Organization Maria Virvou University of Piraeus Alexander Artikis NCSR“Demokritos” George Potamias FORTH Vassilis Plagianakos University of Central Greece Charalampos Doukas University of the Aegean Nikos Hatziargyriou National Technical University of Athens Grigorios Tsoumakas Aristotle University of Thessaloniki Dimitrios Kosmopoulos UTA, USA Michael N. Vrahatis University of Patras Efstathios Stamatatos University of the Aegean Dimitrios Vergados University of Piraeus Sergios Petridis NCSR“Demokritos” Manolis Wallace NTUA Dimitrios Vogiatzis NCSR“Demokritos” George Tsihrintzis University of Piraeus Themis Panayiotopoulos University of Piraeus Georgios A. Pavlopoulos Katholieke Universiteit Leuven Nick Bassiliades Aristotle University of Thessaloniki Christos Papatheodorou Ionian University Ioannis Tsamardinos University of Crete and FORTH Kostas Karpouzis National Technical University of Athens Dimitris Iakovidis TechnologicalEducational Institute of Lamia Lazaros Iliadis Democritus University of Thrace Dimitris Plexousakis FORTH and University of Crete Konstantinos Parsopoulos University of Ioannina Ilias Sakellariou University of Macedonia Petros Kefalas City College, University of Sheffield Aristidis Likas University of Ioannina Todor Ganchev University of Patras Manolis Koubarakis National and Kapodistrian University of Athens Konstantinos Dimopoulos University of Sheffield Jim Prentzas Democritus University of Thrace Vassilis Moustakis Technical University of Crete Yiannis Kompatsiaris CERTH Michalis Savelonas University of Houston Ioannis Refanidis University of Macedonia Dimirtis Tasoulis Winton Capital, UK Christos-Nikolaos Anagnostopoulos University of the Aegean Michalis Vazirgiannis Athens University of Economics and Business Giorgos Stoilos Oxford University, UK Daniel Schober IMBI UKLFR Pantelis Bagos University of Central Greece Kostas Karatzas Aristotle University of Thessaloniki Organization IX Panos Trahanias FORTH and University of Crete Elpiniki Papageorgiou TechnologicalEducational Institute of Lamia Efthyvoulos Kyriacou University of Cyprus Dimitris Apostolou University of Piraeus Vasileios Mezaris Informatics and Telematics Institute Andreas Andreou Technical University of Cyprus Spyros Vosinakis University of the Aegean Theodore Dalamagas IMIS Institute/“Athena”Research Center Georgios Paliouras NCSR“Demokritos” Ilias Maglogiannis University of Central Greece Georgios Dounias University of the Aegean Nicos Pavlidis Lancaster University, UK Stasinos Konstantopoulos NCSR“Demokritos” Ioannis Anagnostopoulos University of Central Greece Ion Androutsopoulos Athens University of Economics and Business Manolis Gergatsoulis Ionian University Nikos Fakotakis University of Patras George Magoulas Birkbeck College, University of London, UK Ioannis Hatzilygeroudis University of Patras Michael Epitropakis University of Patras Christos Douligeris University of Piraeus Katia Lida Kermanidis Ionian University Stathes Hadjiefthymiades University of Athens Ioanna Stamatopoulou City College, University of Sheffield Vangelis Karkaletsis NCSR“Demokritos” Pavlos Peppas University of Patras Dimitris Kalles Hellenic Open University Kostas Stergiou University of Western Macedonia Konstantinos Koutroumbas National Observatory of Athens Constantine Kotropoulos Aristotle University of Thessaloniki Evangelos Sakkopoulos University of Patras Argyris Arnellos University of the Basque Country Constantinos Pattichis University of Cyprus Dimitrios Karras TEI Chalkis Dimitris Vrakas Aristotle University of Thessaloniki Efstratios Georgopoulos TEI Kalamata Eleni Galiotou TEI Athens George Papanagnou Lamia General Hospital Konstantina S. Nikita NTUA Manolis Maragoudakis University of the Aegean Nikos Vasilas TEI Athens Ioannis Pratikakis Democritus University of Thrace Panagiotis Stamatopoulos National and Kapodistrian University of Athens Panayiotis Tsanakas NTUA X Organization Sophia Tsekeridou AIT Stavros Perantonis NCSR“Demokritos” Stefanos Kollias National Technical University of Athens Stelios Piperidis ILSP-Athena RC Yannis Dimopoulos University of Cyprus Local Organizing Committee Theodosios Goudas University of Central Greece Vassilis Pigadas University of Central Greece Sotirios Tasoulis University of Central Greece Charalampos Doukas University of the Aegean