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Author: op den Akker, H.J.A.
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2011

van Dijk, E.M.A.G. and Zwiers, J. and op den Akker, H.J.A. and Kulyk, O. and Hondorp, G.H.W. and Hofs, D.H.W. and Nijholt, A. (2011) Conveying Directional Gaze Cues to Support Remote Participation in Hybrid Meetings. In: Third COST 2102 International Training School, 15-19 March 2010, Caserta, Italy. pp. 425-441. Lecture Notes in Computer Science 6456. Springer Verlag. ISSN 0302-9743 ISBN 978-3-642-18183-2
Dral, J. and Heylen, D.K.J. and op den Akker, H.J.A. (2011) Detecting Uncertainty in Spoken Dialogues: An explorative research for the automatic detection of speaker uncertainty by using prosodic markers. In: Affective Computing and Sentiment Analysis. Text, Speech, and Language Analysis 45. Springer Verlag, London, pp. 67-77. ISSN 1386-291X ISBN 978-94-007-1756-5
Heylen, D.K.J. and op den Akker, H.J.A. and ter Maat, M. and Petta, P. and Rank, S. and Reidsma, D. and Zwiers, J. (2011) On the nature of engineering social artificial companions. Applied Artificial Intelligence, 25 (6). pp. 549-574. ISSN 0883-9514 *** ISI Impact 0,563 ***
Theune, M. and Boer Rookhuiszen, R. and op den Akker, H.J.A. and Geerlings, H. (2011) Generating varied narrative probability exercises. In: Proceedings of the 6th Workshop on Innovative Use of NLP for Building Educational Applications (BEA-6) at ACL-HLT 2011, 24 June 2011, Portland, USA. pp. 20-29. Association for Computational Linguistics. ISBN 978-1-93728-403-9
Wieringa, W.K. and op den Akker, H. and Jones, V.M. and op den Akker, H.J.A. and Hermens, H.J. (2011) Ontology-Based Generation of Dynamic Feedback on Physical Activity. In: 13th International Conference on Artificial Intelligence in Medicine, AIME 2011, 2-6 Jul 2011, Bled, Slovenia. pp. 55-59. Lecture Notes in Artificial Intelligence 6747. Springer Verlag. ISSN 0302-9743 ISBN 978-3-642-22217-7

2010

op den Akker, H.J.A. and Theune, M. and Truong, K.P. and de Kok, I.A. (2010) The Organisation of Floor in Meetings and the Relation with Speaker Addressee Patterns. In: Proceedings of the 2nd International Workshop on Social Signal Processing, SSPW '10, 21 October 2010, Firenze, Italy. pp. 35-40. ACM. ISBN 978-1-4503-0174-9
op den Akker, H.J.A. and Zwiers, J. and Hondorp, G.H.W. and van Dijk, E.M.A.G. and Kulyk, O. and Hofs, D.H.W. and Nijholt, A. and Reidsma, D. (2010) Engagement and Floor Control in Hybrid Meetings. AMI Newsletter, 20 (20). pp. 6-6. ISSN not assigned ISBN not assigned
Cao, Y. and van der Sluis, F. and Theune, M. and op den Akker, H.J.A. and Nijholt, A. (2010) Evaluating Informative Auditory and Tactile Cues for In-Vehicle Information Systems. In: Proceedings of the 2nd International Conference on Automotive User Interfaces and Interactive Vehicular Applications (AutomotiveUI 2010), 11-12 Nov 2010, Pittsburgh, Pennsylvania. pp. 102-109. ACM. ISBN 978-1-4503-0437-5
Hofs, D.H.W. and Theune, M. and op den Akker, H.J.A. (2010) Natural interaction with a virtual guide in a virtual environment: A multimodal dialogue system. Journal on Multimodal User Interfaces, 3 (1-2). pp. 141-153. ISSN 1783-7677
Tigelaar, A.S. and op den Akker, H.J.A. and Hiemstra, D. (2010) Automatic summarisation of discussion fora. Natural language engineering, 16 (02). pp. 161-192. ISSN 1351-3249

2009

op den Akker, H. and op den Akker, H.J.A. (2009) Are you being addressed?: real-time addressee detection to support remote participants in hybrid meetings. In: Proceedings of the SIGDIAL 2009 Conference, 11-12 Sep 2009, London, England. pp. 21-28. The association of computational linguistics. ISBN 978-1-932432-64-0
op den Akker, H.J.A. and Hofs, D.H.W. and Hondorp, G.H.W. and op den Akker, H. and Zwiers, J. and Nijholt, A. (2009) Supporting Engagement and Floor Control in Hybrid Meetings. In: Cross-Modal Analysis of Speech, Gestures, Gaze and Facial Expressions, 15-18 October 2008, Prague. pp. 276-290. Lecture Notes in Computer Science 5641. Springer Verlag. ISSN 0302-9743 ISBN 978-3-642-03319-3
op den Akker, H.J.A. and Traum, D. (2009) A comparison of addressee detection methods for multiparty conversations. In: Proceedings of DiaHolmia, 13th Workshop on the Semantics and Pragmatics of Dialogue, 24-26 Jun 2009, Sockholm, Sweden. pp. 99-106. KTH Stockholm. ISBN not assigned
Heylen, D.K.J. and Theune, M. and op den Akker, H.J.A. and Nijholt, A. (2009) Social Agents: the first generations. In: Proceedings 2009 International Workshop on Social Signals Processing, 13 September 2009, Amsterdam. pp. 114-120. ACII 2009 Proceedings 2. IEEE Computer Society. ISBN 978-1-4244-4799-2
Reidsma, D. and Heylen, D.K.J. and op den Akker, H.J.A. (2009) On the Contextual Analysis of Agreement Scores. In: Multimodal Corpora -- From Models of Natural Interaction to Systems and Applications, 27 May 2008, Morocco. pp. 122-137. Lecture Notes in Computer Science 5509. Springer Verlag. ISSN 0302-9743 ISBN 978-3-642-04792-3
van Schooten, B.W. and op den Akker, H.J.A. and Rosset, S. and Galibert, O. and Max, A. and Illouz, G. (2009) Follow-up question handling in the IMIX and Ritel systems: A comparative study. Natural Language Engineering, 15 (1). pp. 97-118. ISSN 1351-3249
Tigelaar, A.S. and op den Akker, H.J.A. and Verhoeven, F. (2009) Matching Queries to Frequently Asked Questions: Search Functionality for the MRSA Web-Portal. In: Proceedings of the 9th Dutch-Belgian Information Retrieval Workshop (DIR2009), 2 Feb - 3 Feb 2009, Enschede, The Netherlands. pp. 26-33. CTIT Workshop Proceedings (09-01). Centre for Telematics and Information Technology University of Twente. ISSN 0929-0672

2008

op den Akker, H.J.A. and Theune, M. (2008) How Do I Address You? Modelling addressing behavior based on an analysis of a multi-modal corpora of conversational discourse. In: Proceedings of the AISB 2008 Symposium on Multimodal Output Generation (MOG 2008), 3-4 April 2008, Aberdeen, Scotland. pp. 10-17. Society for the Study of Artificial Intelligence and the Simulation of Behaviour (AISB). ISBN 1 902956 69 9
Dral, J. and Heylen, D.K.J. and op den Akker, H.J.A. (2008) Detecting uncertainty in spoken dialogues: an explorative research to the automatic detection of a speakers' uncertainty by using prosodic markers. In: Sentiment analysis: emotion, metaphor, ontology and terminology, 27 May 2008, Marrakech, Marocco. pp. 72-78. ELRA. ISBN 2-9517408-4-0
Hofs, D.H.W. and Theune, M. and op den Akker, H.J.A. (2008) Multimodal Interaction with a Virtual Guide. In: Proceedings of the Twentieth Belgian-Netherlands Conference on Artificial Intelligence, BNAIC 2008, 30-31 Oct 2008, Enschede, The Netherlands. pp. 391-392. University of Twente. ISSN 1568-7805
Nijholt, A. and Reidsma, D. and van Welbergen, H. and op den Akker, H.J.A. and Ruttkay, Z.M. (2008) Mutually coordinated anticipatory multimodal interaction. In: Verbal and Nonverbal Features of Human-Human and Human-Machine Interaction, 29-31 October 2007, Patras, Greece. pp. 70-89. Lecture Notes in Computer Science 5042. Springer Verlag. ISSN 0302-9743 ISBN 978-3-540-70871-1
Poel, M. and Boschman, E. and op den Akker, H.J.A. (2008) A Neural Network Based Dutch Part of Speech Tagger. In: Proceedings of the twentieth Belgian-Dutch Artificial Intelligence Conference (BNAIC 2008)., 30-31 Oct 2008, Enschede/Bad Boekelo, The Netherlands. pp. 217-224. Twente University Press. ISSN 1568-7805
Reidsma, D. and op den Akker, H.J.A. (2008) Exploiting ''Subjective'' Annotations. In: Coling 2008: Proceedings of the workshop on Human Judgements in Computational Linguistics, 23 Aug. 2008, Manchester, UK. pp. 8-16. Coling 2008 Organizing Committee. ISBN 978-1-905593-47-7
Reidsma, D. and op den Akker, H.J.A. (2008) Subjective Machine Classifiers. In: BNAIC 2008, Proceedings 20th Belgian-Netherlands Conference on Artificial Intelligence, Boekelo, Netherlands, 30-31 Oct 2008, Boekelo, Netherlands. pp. 359-360. University of Twente. ISSN 1568-7805
Reidsma, D. and Heylen, D.K.J. and op den Akker, H.J.A. (2008) On the Contextual Analysis of Agreement Scores. In: Proceedings of the LREC Workshop on Multimodal Corpora, 27 May 2008, Marrakech, Morrocco. pp. 52-55. ELRA. ISBN 2-9517408-4-0
Ruttkay, Z.M. and op den Akker, H.J.A. (2008) Affordances and Cognitive Walkthrough for Analyzing Human-Virtual Human Interaction. In: Verbal and Nonverbal Features of Human-Human and Human-Machine Interaction. Lecture Notes in Computer Science 5042. Springer Verlag, London, pp. 94-110. ISBN 9783540708711

2007

op den Akker, H.J.A. and Heylen, D.K.J. (2007) Feedback Loops in Communication and Human Computing. In: Artifical Intelligence for Human Computing. Lecture Notes in Computer Science 4451. Springer Verlag, Berlin, pp. 215-233. ISBN 978-3-540-72346-2
Heylen, D.K.J. and op den Akker, H.J.A. (2007) Computing Backchannel Distributions in Multi-Party Conversations. In: Proceedings of the ACL Workshop on Embodied Language Processing, 28 June 2007, Prague. pp. 17-24. Association of Computational Linguistics. ISBN not assigned
Keizer, S. and op den Akker, H.J.A. (2007) Dialogue act recognition under uncertainty using Bayesian networks. Natural Language Engineering, 13 (04). pp. 287-316. ISSN 1351-3249
Poel, M. and Stegeman, L. and op den Akker, H.J.A. (2007) A Support Vector Machine Approach to Dutch Part-of-Speech Tagging. In: Advances in Intelligent Data Analysis VII. Proceedings of the 7th International Symposium on Intelligent Data Analysis, IDA 2007, 6-8 Sept 2007, Ljubljana, Slovenia. pp. 274-283. Lecture Notes in Computer Science 4723. Springer Verlag. ISSN 0302-9743 ISBN 978-3-540-74824-3
Reidsma, D. and op den Akker, H.J.A. and Rienks, R.J. and Poppe, R.W. and Nijholt, A. and Heylen, D.K.J. and Zwiers, J. (2007) Virtual Meeting Rooms: From Observation to Simulation. AI and Society, 22 (2). pp. 133-144. ISSN 0951-5666
van Schooten, B.W. and op den Akker, H.J.A. (2007) Multimodal follow-up questions to multimodal answers in a QA system. In: Tenth international symposium on social communication, 22-26 jan 2007, Cuba. pp. 469-474. Centro de Linguistica Aplicada. ISBN 959-7174-08-1
van Schooten, B.W. and Rosset, S. and Galibert, O. and Max, A. and op den Akker, H.J.A. and Illouz, G. (2007) Handling speech input in the Ritel QA dialogue system. In: Interspeech 2007, 27-31 Aug 2007, Antwerp. pp. 126-129. International Speech Communication Association. ISSN 1990-9772
Theune, M. and van Schooten, B.W. and op den Akker, H.J.A. and Bosma, W.E. and Hofs, D.H.W. and Nijholt, A. and Krahmer, E.J. and van Hooijdonk, C.M.J. and Marsi, E.C. (2007) Questions, pictures, answers: introducing pictures in question-answering systems. (Invited) In: ACTAS-1 of X Symposio Internacional de Comunicacion Social, 22-26 Jan 2007, Santiago de Cuba, Cuba. pp. 450-463. Centro de Linguistica Aplicada. ISBN 959-7174-08-1

2006

op den Akker, H.J.A. and van Schooten, B.W. (2006) Vervolguitingen in vraag-antwoorddialoogsystemen. DIXIT, tijdschrift over toegepaste taal- en spraaktechnologie, 4 (1). pp. 10-11. ISSN 1572-6037
Jovanović, N. and op den Akker, H.J.A. and Nijholt, A. (2006) A corpus for studying addressing behaviour in multi-party dialogues. Language Resources and Evaluation, 40 (1). pp. 5-23. ISSN 1574-020X *** ISI Impact 0,615 ***
Jovanović, N. and op den Akker, H.J.A. and Nijholt, A. (2006) Addressee Identification In Face-to-Face Meetings. In: Proceedings of 11th Conference of the European Chapter of the ACL (EACL), 3 Apr - 7 Apr 2006, Trento, Italy. pp. 169-176. Association for Computational Linguistics. ISBN 1-932432-59-0
Nijholt, A. and op den Akker, H.J.A. and Heylen, D.K.J. (2006) Meetings and Meeting Modeling in Smart Environments. AI and Society, 20 (2). pp. 202-220. ISSN 0951-5666
van Schooten, B.W. and op den Akker, H.J.A. (2006) Follow-up utterances in QA dialogue. Traitement Automatique des Langues, 46 (3). pp. 181-206. ISSN 1248-9433

2005

op den Akker, H.J.A. and Bunt, H.C. and Keizer, S. and van Schooten, B.W. (2005) From question answering to spoken dialogue - towards an information search assistant for interactive multimodal information extraction. In: Proc. 9th European Conference on Speech Communication and Technology (Interspeech 2005), 4-8 Sep 2005, Lisbon, Portugal. pp. 2793-2796. European Speech Communication Association (ESCA) / CEP Consultants. ISSN 1018-4074
Ghijsen, M. and Heylen, D.K.J. and Nijholt, A. and op den Akker, H.J.A. (2005) Facial Affect Displays during Tutoring Sessions. In: Presented at Affective Interactions: The Computer in the Affective Loop. Workshop at IUI 2005: International Conference on Intelligent User Interfaces, San Diego, CA, USA. ISBN not assigned
Heylen, D.K.J. and Ghijsen, M. and Nijholt, A. and op den Akker, H.J.A. (2005) Facial Signs of Affect During Tutoring Sessions. In: Affective Computing and Intelligent Interaction - First International Conference, ACII 2005, Beijing, China. pp. 24-31. Lecture notes in Computer Science 3748. Springer Verlag. ISBN 3-540-29621-2
Heylen, D.K.J. and Nijholt, A. and op den Akker, H.J.A. (2005) Affect in Tutoring Dialogues. Applied Artificial Intelligence (special issue on Educational Agents - Beyond Virtual Tutors), 19 (3-4). pp. 287-310. ISSN 0883-9514 *** ISI Impact 0,563 ***
Jovanović, N. and op den Akker, H.J.A. and Nijholt, A. (2005) Addressee Identification in Meetings. In: CHI 2005 Workshop on the virtuality continuum revisited. ISBN not assigned
Jovanović, N. and op den Akker, H.J.A. and Nijholt, A. (2005) A corpus for studying addressing behavior in multi-party dialogues. In: Proceedings 6th SIGdial Workshop on Discourse and Dialogue, Lisbon, Portugal. pp. 107-116. ISBN not assigned
Reidsma, D. and op den Akker, H.J.A. and Rienks, R.J. and Poppe, R.W. and Nijholt, A. and Heylen, D.K.J. and Zwiers, J. (2005) Virtual Meeting Rooms: From Observation to Simulation. In: Proceedings Social Intelligence Design 2005. Stanford University.

2004

Heylen, D.K.J. and Vissers, M. and op den Akker, H.J.A. and Nijholt, A. (2004) Affective feedback in a tutoring system for procedural tasks. In: ISCA Workshop on Affective Dialogue Systems, 14-16 June 2004, Kloster Irsee, Germany. pp. 244-253. Lecture Notes in Computer Science 3068. Springer Verlag. ISBN 3-540-22143-3
Jovanović, N. and op den Akker, H.J.A. (2004) Towards automatic addressee identification in multi-party dialogues. In: Proceedings of the 5th SIGdial Workshop on Discourse and Dialogue, 30 Apr - 01 May 2004, Boston, MA, USA. pp. 89-92. Association for Computational Linguistics.
Mulder, M.P. and Nijholt, A. and op den Akker, H.J.A. and den Uyl, M. and Terpstra, P. (2004) A Lexical, Grammatical Implementation of Affect. In: 7th International Conference on Text, Speech & Dialogue (TSD 2004), 8-11 September 2004, Brno, Czech Republic. pp. 171-177. Lecture Notes in Computer Science 3206. Springer Verlag. ISBN 3-540-23049-1
Nijholt, A. and op den Akker, H.J.A. and Heylen, D.K.J. (2004) Meetings and meeting modeling in smart surroundings. In: Social Intelligence Design. Proceedings third international workshop, Enschede. pp. 145-158. CTIT-Series WP-04-02. Centre for Telematics and Information Technology University of Twente. ISBN 90-75296-12-6
Poel, M. and op den Akker, H.J.A. and Heylen, D.K.J. and Nijholt, A. (2004) Emotion based Agent Architectures for Tutoring Systems: The INES Architecture. In: Cybernetics and Systems 2004. Workshop on Affective Computational Entities (ACE 2004), 13-16 April 2004, Vienna, Austria. pp. 663-667. Austria Society of Cybernetic Studies. ISBN 3 85206 169 5
Theune, M. and Rensen, S. and op den Akker, H.J.A. and Heylen, D.K.J. and Nijholt, A. (2004) Emotional characters for automatic plot creation. In: TIDSE 2004: Technologies for Interactive Digital Storytelling and Entertainment, 24-26 June 2004, Darmstadt, Germany. pp. 95-100. Lecture Notes in Computer Science 3105. Springer Verlag. ISSN 0302-9743 ISBN 3-540-22283-9
Zwarts, S. and Nijholt, A. and op den Akker, H.J.A. and Poel, M. (2004) CBR in Dependency-based Machine Translation. In: Proceedings of Konvens 2004, 14-17 September 2004, Vienna, Austria. pp. 205-208. Schriftenreihe der Oesterreichischen Gesellschaft fuer Artificial Intelligence 5. Oesterreichischen Gesellschaft fuer Artificial Intelligence. ISBN 3-85027-005-X

2003

Burghouts, G.J. and Heylen, D.K.J. and Poel, M. and op den Akker, H.J.A. and Nijholt, A. (2003) An Action Selection Architecture for an Emotional Agent. In: Recent Advances in Artificial Intelligence. Proceedings of the 16th International FLAIRS, 12-14 May 2003, St. Augustine, Florida. pp. 293-297. AAAI Press. ISBN 978-1-57735-177-1
van Dijk, E.M.A.G. and op den Akker, H.J.A. and Nijholt, A. and Zwiers, J. (2003) Navigation assistance in virtual worlds. Informing Science, Special Series on Community Informatics, 6. pp. 115-125. ISSN 1547-9684
Heylen, D.K.J. and Nijholt, A. and op den Akker, H.J.A. and Vissers, M. (2003) Socially Intelligent Tutor Agents. In: Proceedings Intelligent Virtual Agents (IVA 2003), 15-17 September 2003, Kloster Irsee, Germany. pp. 341-347. Lecture Notes in Artificial Intelligence 2792. Springer Verlag. ISBN 3-540-20003-7
Hofs, D.H.W. and op den Akker, H.J.A. and Nijholt, A. (2003) A generic architecture and dialogue model for multimodal interaction. In: Proceedings of the 1st Nordic Symposium on Multimodal Communication, 25-26 Sep 2003, Copenhagen, Denmark. pp. 79-91. CST Publication, Center for Sprogteknologi. ISSN 1600-339X
Hofs, D.H.W. and op den Akker, H.J.A. and Nijholt, A. and Hondorp, G.H.W. (2003) A multimodal interaction system for navigation. In: Proceedings Diabrück 2003, 7th Workshop on the Semantics and Pragmatics of Dialogue, 4-6 September 2003, Saarbruecken, Germany. pp. 183-184. Saarland University.
Hospers, M. and Kroezen, E. and Nijholt, A. and op den Akker, H.J.A. and Heylen, D.K.J. (2003) An Agent-based Intelligent Tutoring System for Nurse Education. Technical Report TR-CTIT-03-18, Centre for Telematics and Information Technology University of Twente, Enschede. ISSN 1381-3625
Hospers, M. and Kroezen, E. and Nijholt, A. and op den Akker, H.J.A. and Heylen, D.K.J. (2003) Developing a Generic Agent-based Intelligent Tutoring System. In: 3rd IEEE International Conference on Advanced Learning Technologies (ICALT 2002), 9-12 July 2003, Athens, Greece. pp. 443-443. IEEE Computer Society. ISBN 0-7695-1967-9
Hospers, M. and Kroezen, E. and Nijholt, A. and op den Akker, H.J.A. and Heylen, D.K.J. (2003) An agent-based intelligent tutoring system for nurse education. In: Applications of Software Agent Technology in the Health Care Domain. Whitestein Series in Software Agent Technologies. Birkhauser Publishing Ltd, Basel, Switzerland, pp. 143-159. ISBN 978-3-7643-2662-3
Nijholt, A. and op den Akker, H.J.A. and de Jong, F.M.G. (2003) Language interpretation and generation for football commentary. In: ACTAS-1: VIII Symposio Social, 20-24 January 2003, Santiago de Cuba. pp. 594-599. Centro de Linguistica Aplicade. ISBN 959-7174-01-4
Nijholt, A. and op den Akker, H.J.A. and de Jong, H. (2003) Language Interpretation and Generation for Football Commentary. Technical Report TR-CTIT-03-01, Centre for Telematics and Information Technology University of Twente, Enschede. ISSN 1381-3625

2002

op den Akker, H.J.A. and Hospers, M. and Kroezen, E. and Nijholt, A. and Lie, D.H. (2002) A rule-based reference resolution method for Dutch discourse. In: Proceedings 2002 Symposium on Reference Resolution in Natural Language Processing, 3-4 June 2002, Alicante, Spain. pp. 59-66. University of Alicante.
Keizer, S. and op den Akker, H.J.A. and Nijholt, A. (2002) Dialogue Act Recognition with Bayesian Networks for Dutch Dialogues. In: Proceedings 3rd SIGdial Workshop on Discourse and Dialogue, 11-12 July 2002, Philadelphia, Pennsylvania. pp. 88-94. ACL SIGDIAL.
Nijholt, A. and van Luin, J. and op den Akker, H.J.A. (2002) Een navigatie-agent in virtual reality. I/O Vivat, 2 (5). pp. 36-39. ISSN 1389-0468
Poel, M. and op den Akker, H.J.A. and Nijholt, A. and van Kesteren, A.-J. (2002) Learning emotions in virtual environments. In: Cybernetics and Systems 2002, 2-5 April 2002, Vienna, Austria. pp. 751-755. Austrian Society for Cybernetic Studies. ISBN 3-85206-160-1

2001

van Dijk, E.M.A.G. and op den Akker, H.J.A. and Nijholt, A. and Zwiers, J. (2001) Navigation assistance in virtual worlds. In: E-Proceedings 2001 Informing Science Conference, 19-22 June 2001, Krakov, Poland. pp. 1-9. Informing Science Institute (ISI). ISSN 1535-0703
van Dijk, E.M.A.G. and Nijholt, A. and op den Akker, H.J.A. and Zwiers, J. (2001) Persoonlijke assistentie in virtuele werelden. Informatie, 43. pp. 42-46. ISSN 0019-9907
Egges, A. and Nijholt, A. and op den Akker, H.J.A. (2001) Dialogs with BDP agents in virtual environments. In: Knowledge and Reasoning in Practical Dialogue Systems. Working Notes, IJCAI-2001, 5 August 2001, Seattle, WA, USA. pp. 29-35. ACM IJCAI.
van Luin, J. and op den Akker, H.J.A. and Nijholt, A. (2001) A dialogue agent for navigation support in virtual reality. In: Conf. on Human factors in computing systems (CHI), Seattle, Washington. pp. 117-118. ACM Press. ISBN 1-58113-340-5
van Luin, J. and Nijholt, A. and op den Akker, H.J.A. (2001) Natural Language Navigation Support in Virtual Reality. In: Proceedings International Conference on Augmented, Virtual Environments and Three-Dimensional Imaging (ICAV3D), 30 May - 1 June 2001, Mykonos, Greece. pp. 263-266. CERTH.
Nijholt, A. and Egges, A. and op den Akker, H.J.A. and Zwiers, J. (2001) Animated BDP agents in virtual environments. In: Proceedings 13th Belgian-Dutch Artificial Intelligence Conference (BNAIC'01), 25-26 October 2001, Amsterdam. pp. 481-482. University of Amsterdam.

2000

op den Akker, H.J.A. and Nijholt, A. (2000) Dialogues for Embodied Agents in Virtual Environments. In: Natural Language Processing - NLP 2000, Second International Conference, 2-4 June 2000, Patras, Greece. pp. 358-369. Lecture Notes in Artificial Intelligence 1835. Springer Verlag. ISBN 3-540-67605-8
van Kesteren, A.-J. and op den Akker, H.J.A. and Poel, M. and Nijholt, A. (2000) Simulation of emotions of agents in virtual environments using neural networks. In: Learning to Behave: Internalising Knowledge, 22-24 November 2000, Enschede, the Netherlands. pp. 137-147. Twente Workshop on Language Technology 18. University of Twente. ISSN 0929-0672
Zwiers, J. and van Dijk, E.M.A.G. and Nijholt, A. and op den Akker, H.J.A. (2000) Design issues for navigation and assistance agents in virtual environments. In: Learning to Behave: Interacting Agents, 18-20 October 2000, Enschede, the Netherlands. pp. 119-132. Twente Workshop on Language Technology (17). University of Twente. ISSN 0929-0672

1998

Lie, D.H. and Hulstijn, J. and op den Akker, H.J.A. and Nijholt, A. (1998) A Transformational Approach to NL Understanding in Dialogue Systems. In: Proceedings NLP and Industrial Applications, 18-20 August 1998, Moncton, Canada. pp. 163-168. Université de Moncton.

1996

Sikkel, K. and op den Akker, H.J.A. (1996) Predictive Head-Corner Chart Parsing. In: Recent Advances in Parsing Technology. Text, Speech and Language Technology 1. Kluwer Academic Publishers, Boston, pp. 169-182. ISBN 0-7923-4152-X

1995

op den Akker, H.J.A. and ter Doest, H.W.L. and Moll, M. and Nijholt, A. (1995) Parsing in Dialogue Systems using Typed Feature Structures. Memorandum Informatica 95-25, Department of Computer Science, University of Twente, Enschede. ISSN 0924-3755
op den Akker, H.J.A. and ter Doest, H.W.L. and Moll, M. and Nijholt, A. (1995) Parsing in dialogue systems using typed feature structures. In: Proceedings 3rd International Workshop on Parsing Technologies (IWPT'95), 20-23 September 2007, Prague. pp. 10-11. University of Prague.
Andernach, J.A. and ter Doest, H.W.L. and op den Akker, H.J.A. and van der Hoeven, G.F. and Schaake, J. and van de Burgt, S.P. and Nijholt, A. (1995) Language analysis for dialogue management in a theatre information and booking system. In: Proceedings of Artificial Intelligence'95: Fifteenth International Conference (Language Engineering 95), Montpellier, France. pp. 351-362. University of Montpellier.

1994

op den Akker, H.J.A. and ter Doest, H.W.L. (1994) Weakly Restricted Stochastic Grammars. In: COLING 1994, 15th International Conference on Computational Linguistics, 5-9 Aug 1994, Kyoto, Japan. pp. 929-934. Association for Computational Linguistics.

1993

Sikkel, K. and op den Akker, H.J.A. (1993) Predictive Head-Corner Chart Parsing. In: Third International Workshop on Parsing Technologies (IWPT3), 10-13 Aug 1993, Tilburg, the Netherlands / Durbuy, Belgium. pp. 267-276. IWPT (3). Tilburg University. ISBN not assigned

1989

op den Akker, H.J.A. (1989) On LC(0) grammars and languages. Theoretical computer science, 66 (1). pp. 65-85. ISSN 0304-3975 *** ISI Impact 0,838 ***

1988

op den Akker, H.J.A. (1988) Parsing Attribute Grammars. PhD thesis, University of Twente.

1987

op den Akker, H.J.A. (1987) On Covers and Left-Corner Parses. In: Essays on concepts, formalisms, and tools. CWI Tract (42). Stichting Mathematisch Centrum, Amsterdam, pp. 107-127. ISBN 90 6196 326 5