3 Berlin Heidelberg NewYork Barcelona HongKong London Milan Paris Singapore Tokyo Evelina Lamma Paola Mello (Eds.) ∗ AI IA 99: Advances in Artificial Intelligence 6th Congress of Italian Association for Artificial Intelligence Bologna, Italy, September 14-17, 1999 Selected Papers 1 3 SeriesEditors JaimeG.Carbonell,CarnegieMellonUniversity,Pittsburgh,PA,USA Jo¨rgSiekmann,UniversityofSaarland,Saarbru¨cken,Germany VolumeEditors EvelinaLamma PaolaMello UniversityofBologna DEIS VialeRisorgimento,2,40136Bologna,Italy E-mail:{elamma/pmello}@deis.unibo.it Cataloging-in-PublicationDataappliedfor DieDeutscheBibliothek-CIP-Einheitsaufnahme Advancesinartificialintelligence:Bologna,Italy,September14- 17,1999;selectedpapers/EvelinaLamma;PaolaMello(ed.).- Berlin;Heidelberg;NewYork;Barcelona;HongKong;London; Milan;Paris;Singapore;Tokyo:Springer,2000 (...congressoftheItalianAssociationforArtificial Intelligence,AIIA...;6) (Lecturenotesincomputerscience;Vol.1792:Lecturenotesin artificialintelligence) ISBN3-540-67350-4 CRSubjectClassification(1991):I.2 ISBN3-540-67350-4Springer-VerlagBerlinHeidelbergNewYork Thisworkissubjecttocopyright.Allrightsarereserved,whetherthewholeorpartofthematerialis concerned,specificallytherightsoftranslation,reprinting,re-useofillustrations,recitation,broadcasting, reproductiononmicrofilmsorinanyotherway,andstorageindatabanks.Duplicationofthispublication orpartsthereofispermittedonlyundertheprovisionsoftheGermanCopyrightLawofSeptember9,1965, initscurrentversion,andpermissionforusemustalwaysbeobtainedfromSpringer-Verlag.Violationsare liableforprosecutionundertheGermanCopyrightLaw. Springer-VerlagisacompanyintheBertelsmannSpringerpublishinggroup. ©Springer-VerlagBerlinHeidelberg2000 PrintedinGermany Typesetting:Camera-readybyauthor Printedonacid-freepaper SPIN10720068 06/3142 543210 Preface This book contains the extended versions of 33 papers selected among those originally presented at the Sixth Congress of the Italian Association for Artificial Intelligence (AI*IA). The congress of the AI*IA is the most relevant Italian event in the field of Artificial Intelligence, and has been receiving much attention from many researchers and practitioners of different countries. The sixth congress was held in Bologna, 14-17 September 1999, and was organized in twelve scientific sessions and one demo session. The papers here collected report on significant work carried out in different areas of artificial intelligence, in Italy and other countries. Areas such as automated reasoning, knowledge representation, planning, and machine learning continue to be thoroughly investigated. The collection also shows a growing interest in the field of multi-agent systems, perception and robotics, and temporal reasoning. Many people contributed in different ways to the success of the congress and to this volume. First of all, the members of the program committee who efficiently handled the reviewing of the 64 papers submitted to the congress, and later on the reviewing of the 41 papers submitted for publication in this volume. They provided three reviews for each manuscript, by relying on the support of valuable additional reviewers. The members of the organizing committee, namely Rosangela Barruffi, Paolo Bellavista, Anna Ciampolini, Marco Cremonini, Enrico Denti, Marco Gavanelli, Mauro Gaspari, Michela Milano, Rebecca Montanari, Andrea Omicini, Fabrizio Riguzzi, Cesare Stefanelli, and Paolo Torroni, worked hardy supporting at solving problems during and after the congress. We wish to thank Giovanni Soda who, as director of AI*IA Bulletin, helped us in promoting the congress, and Maurelio Boari for encouraging us in organizing the event. The financial support of the Fondazione CARISBO, Bologna, Italy, for partially covering the publication cost of this book, is acknowledged. Finally, a special thank to our families and husbands, Claudio and Paolo, who have made our life and work easier. January 2000 Evelina Lamma and Paola Mello Program Chairs Evelina Lamma, Paola Mello (Università di Bologna) Program Committee Giovanni Adorni (Università di Parma) Andrea Bonarini (Politecnico di Milano) Ernesto Burattini (CNR - Napoli) Luigia Carlucci Aiello (Università di Roma "La Sapienza") Riccardo Cassinis (Università di Brescia) Amedeo Cesta (CNR - Roma) Mauro Di Manzo (Università di Genova) Floriana Esposito (Università di Bari) Salvatore Gaglio (Università di Palermo) Fausto Giunchiglia (Università di Trento) Liliana Ironi (CNR - Pavia) Leonardo Lesmo (Università di Torino) Patrizia Marti (Università di Siena) Gianni Morra (Centro Ricerche FIAT, Orbassano) Lorenza Saitta (Università di Torino) Giorgio Satta (Università di Padova) Marco Schaerf (Università di Roma "La Sapienza") Roberto Serra (Montecatini S.p.A., Ravenna) Carlo Tasso (Università di Udine) Franco Turini (Università di Pisa) Organization VII Referees Adorni Giovanni Giunchiglia Enrico Amigoni Francesco Andretta Massimo Liberatore Paolo Armando Alessandro Maccione Maria Grazia Battiti Roberto Malerba Donato Bellazzi Riccardo Manco Giuseppe Benedetti Marco Melucci Massimo Bergamaschi Sonia Milani Alfredo Bergenti Federico Milano Michela Bianchi Dario Blanzieri Enrico Nardi Daniele Bonarini Andrea Bracciali Andrea Oddi Angelo Brogi Antonio Omicini Andrea Cagnoni Stefano Pianesi Fabio Cappelli Amedeo Pilato Giovanni Carlo Ferrari Poggi Agostino Castelfranchi Cristiano Castellini Claudio Quenda Valter Cattoni Roldano Chella Antonio Raffaetà Alessandra Contiero Simone Ramoni Marco Cossentino Massimo Riguzzi Fabrizio Roli Andrea D’Aloisi Daniela Damiano Rossana Secco Suardo Gian Maria Danieli Morena Semeraro Giovanni De Carolis Simi Maria De Falco Ivanoe Suggi Liverani Furio De Rosis Di Gregorio Salvatore Tacchella Armando Terenziani Paolo Fabio Massacci Falcone Rino Vitabile Salvatore Fanelli Anna Maria Vivo Giulio Ferilli Stefano Focacci Filippo Zaccaria Renato Zanardo Alberto Giordano Laura Zanichelli Francesco Table of Contents Knowledge Representation Generalized Default Logic: Minimal Knowledge, Autoepistemic, and Default Reasoning Reconciled...................................................................................................1 D. Nardi, R. Rosati A Description Logic for Image Retrieval....................................................................13 E. Di Sciascio, F.M. Donini, M. Mongiello Certainty-Factor-Like Structures in Bayesian Networks.............................................25 P. Lucas Sensitivity Analysis for Threshold Decision Making with Bayesian Belief Networks..37 L.C. van der Gaag, V.M.H. Coupé Automated Reasoning Abduction with Negation as Failure for Active and Reactive Rules...........................49 F. Sadri, F. Toni An Implementation for Abductive Logic Agents........................................................61 A. Ciampolini, E. Lamma, P. Mello, C. Stefanelli, P. Torroni Solving the Satisfiability Problem through Boolean Networks...................................72 M. Milano, A. Roli Applying the Davis-Putnam Procedure to Non-clausal Formulas...............................84 E. Giunchiglia, R. Sebastiani The SAT-Based Approach for Classical Modal Logics..............................................95 E. Giunchiglia, F. Giunchiglia, A. Tacchella Local Search Techniques for Disjunctive Logic Programs.......................................107 N. Leone, S. Perri, P. Rullo Labelled Tableaux for Non-normal Modal Logics....................................................119 G. Governatori, A. Luppi Temporal and Qualitative Reasoning Pairing Transitive Closure and Reduction to Efficiently Reason about Partially Ordered Events..........................................................................................................131 M. Franceschet, A. Montanari TimeNetManager - A Software Tool for Generating Random Temporal Networks...143 A. Cesta, A. Oddi, A. Susi A Fuzzy Extension of Allen’s Interval Algebra.........................................................155 S. Badaloni, M. Giacomin Non Binary CSPs and Heuristics for Modeling and Diagnosing Dynamic Systems....166 A. Panati X Table of Contents Machine Learning, Data Mining and Theory Revision Relational Learning: Hard Problems and Phase Transitions.....................................178 M. Botta, A. Giordana, L. Saitta, M. Sebag A Machine Learning Approach to Web Mining........................................................190 F. Esposito, D. Malerba, L. Di Pace, P. Leo Experiences with a Logic-Based Knowledge Discovery Support Environment.......202 F. Giannotti, G. Manco, D. Pedreschi, F. Turini Conceptual Change in Learning Naive Physics: The Computational Model as a Theory Revision Process ........................................214 F. Esposito, G. Semeraro, N. Fanizzi, S. Ferilli Using the Hermite Regression Formula to Design a Neural Architecture with Automatic Learning of the “Hidden” Activation Functions......................................226 S. Gaglio, G. Pilato, F. Sorbello, G. Vassallo Natural Language and WWW Interfaces XIG: Generating from Interchange Format Using Mixed Representations...............238 E. Pianta, L.M. Tovena Natural Language Access to Public Administration Data: The TAMIC-P System...............................................................................................249 C. Bagnasco, A. Cappelli, B. Magnini, D. Zamatteo On the Application of Personalization Techniques to News Servers on the WWW..261 L. Ardissono, L. Console, I. Torre Multi-agent Systems Levels of Delegation and Levels of Adoption as the Basis for Adjustable Autonomy......................................................................273 R. Falcone, C. Castelfranchi Notes on Formalizing Coordination..........................................................................285 A. Agostini Autonomous Spacecraft Resource Management: A Multi-agent Approach..............297 N. Monekosso, P. Remagnino Multi-agent Scene Interpretation...............................................................................309 P. Remagnino, J. Orwell, G.A. Jones An algorithm for Recruitment of Agents in Agency Design.....................................321 F. Amigoni, M. Villa Perception and Robotics Towards a Conceptual Representation of Actions.....................................................333 A. Chella, M. Frixione, S. Gaglio Cellular Automata Based Inverse Perspective Transform as a Tool for Indoor Robot Navigation...........................................................................................345 G. Adorni, S. Cagnoni, M. Mordonini Planning and Scheduling On Plan Adaptation through Planning Graph Analysis.............................................356 A. Gerevini, I. Serina Real-Time Motion Planning in Autonomous Vehicles: A Hybrid Approach............368 M. Piaggio, A. Sgorbissa Table of Contents XI Solving Employee Timetabling Problems by Generalized Local Search..................380 A. Schaerf, A. Meisels Author Index............................................................................................................391