Research

Research Interests

My current research interests are: Semantics, Knowledge Graphs, Chatbots and Intelligent Assistants

Working Groups

1. Schema Tourism Working Group (2017 - 2020)

2. Online Communication WG (OC) (2011 - 2016)

3. Conceptual Models for Services WG (CMS) (2008 - 2009)

4. Web Service Modelling Ontology WG (WSMO) (2004 - 2007)

5. Web Service Modelling Language WG (WSML) (2004 - 2007)

6. Web Service Modelling Execution Environment WG (WSMX) (2004 - 2007)

7. OASIS Web Services Quality Model TC (OASIS WSQM TC) (2006 - 2007)

8. Semantic Web Portal Project WG (SWP) (April 2004 - August 2004)

9. E-Tourism WG (June 2004 - November 2004)

Chaired and (co-)organized events

1. Co-chair of the 8th International Joint Conference on Rules and Reasoning Industry Track, Bucharest, Romania, September 16-24, 2024.

2. Co-chair of the 5th International Joint Conference on Rules and Reasoning Industry Track, Leuven, Belgium, September 8-15, 2021.

3. Co-chair of the 4th International Joint Conference on Rules and Reasoning Industry Track, Oslo, Norway, June 23 - July 1, 2020.

4. Workshop chair at the IEEE International Conference on Cloud and Big Data (IEEE CBD'2015), Beijing, China, August 10-15, 2015.

5. Co-chair of the 2nd International Workshop on Benchmarking RDF Systems (BeRSys'14) co-located with the 40th International Conference on Very Large Data Bases (VLDB2014), Hangzhou, China, September 5, 2014.

6. Co-chair of the 1st International Workshop on Benchmarking RDF Systems (BeRSys'13) co-located with the 10th Extended Semantic Web Conference (ESWC 2013), Montpellier, France, May 26-30, 2013.

7. Co-chair of the 4th Non-Functional Properties and Service Level Agreements Management in Service Oriented Computing Workshop (NFPSLAM-SOC’10) co-located with the 8th IEEE European Conference on Web Services (ECOWS 2010), Ayia Napa, Cyprus, December 1-3, 2010.

8. Co-chair of the 3rd Non-Functional Properties and Service Level Agreements Management in Service Oriented Computing Workshop (NFPSLAM-SOC’09) co-located with the 7th IEEE International Conference on Service Oriented Computing (ICSOC 2009) and ServiceWave 2009, Stockholm, Sweeden, November 24, 2009.

9. Co-chair of the 2nd Service Matchmaking and Resource Retrieval in the Semantic Web Workshop (SMR2), co-located with the 7th International Semantic Web Conference ()ISWC 2008), Karlsruhe, Germany, October 26, 2008.

10. Co-chair of the 2nd Non-Functional Properties and Service Level Agreements in Service Oriented Computing Workshop (NFPSLA-SOC’08) co-located with the 6th IEEE European Conference on Web Services (ECOWS 2008), Dublin, Ireland, November 12, 2008.

11. Co-chair of the 1st Service Matchmaking and Resource Retrieval in the Semantic Web Workshop (SMR2), co-located with the 6th International Semantic Web Conference (ISWC 2007) and 2nd Asian Semantic Web Conference (ASWC 2007), Busan, Korea, November 11, 2007.

12. Co-chair of the 1st Non-Functional Properties and Service Level Agreements in Service Oriented Computing Workshop (NFPSLA-SOC'07), co-located with the 5th International Conference on Service Oriented Computing (), Vienna, Austria, September 17, 2007.

13. Co-chair of the 1st Service Discovery on the WWW Workshop (sdisco'06) , co-located with the 1st Asian Semantic Web Conference (ASWC 2006), Beijing, China, September 4, 2006.

Program Committees

1. Member in the Program Committee (PC) of the 1st Workshop on "Knowledge Graphs and Neurosymbolic AI Workshop (KG-NeSy 2024) at the AIRoV – The First Austrian Symposium on AI, Robotics, and Vision, Innsbruck, Austria, March 26–2, 2024.

2. Member in the Program Committee (PC) of the PRIWAKG 2023 : Pacific Rim International Workshop on Applied Knowledge Graphs, Jakarta, Indonesia, November 15-16, 2023.

3. Member in the Program Committee (PC) of the 17th International Conference on Ontologies, DataBases, and Applications of Semantics (ODBASE2018), Valletta, Malta, October 23-24, 2018.

4. Member in the Program Committee (PC) of the 1st International Workshop on Knowledge Graphs on Travel and Tourism (TourismKG 2018), Cáceres, Spain, June 5-8, 2018.

5. Member in the Program Committee (PC) of the 25th ENTER2018 eTourism Conference (ENTER2018), Jönköping, Sweden, January 24-26, 2018.

6. Member in the Program Committee (PC) of the 16th International Semantic Web Conference (ISWC 2017) Research, Vienna, Austria, October 21-25, 2017.

7. Member in the Program Committee (CP) of the 16th International Conference WWW/Internet 2017 (ICWI17), Algarve, Portugal, October 18-20, 2017.

8. Member in the Program Committee (PC) of the 24th ENTER2017 eTourism Conference (ENTER2017), Rome, Italy, January 24-26, 2017.

9. Member in the Program Committee (PC) of the 12th International Conference on Semantic Systems (SEMANTiCS 2016), Leipzig, Germany, September 12-15, 2016.

10. Member in the Program Committee (PC) of the 20th International Conference on Knowledge Engineering and Knowledge Management (EKAW 2016), Bologna, Italy, November 19-23, 2016.

11. Member in the Program Committee (PC) of the 6th Conference on Knowledge Engineering and Semantic Web (KESW 2016), Prague, Czech Republic, September 21 - 23, 2016.

12. Member in the Program Committee (PC) of the 12th International Conference on Semantic Systems (SEMANTiCS 2015), Leipzig, Germany, September 12-15, 2016.

13. Member in the Program Committee (PC) of the 13th ESWC 2016, Research Track, Heraklion, Greece, May 29 - June 2, 2016.

14. Member in the Program Committee (PC) of the 10th International Conference on Advances in Semantic Processing (SEMAPRO 2016), Venice, Italy, October 9-13, 2016.

15. Member in the Program Committee (PC) of the 5th Conference on Knowledge Engineering and Semantic Web (KESW 2015), Moscow, Russia, September 30 - October 2, 2015.

16. Member in the Program Committee (CP) of the 14th International Conference WWW/Internet 2015 (ICWI15), Dublin, Ireland, October 24-26, 2015.

17. Member in the Program Committee (PC) of the 14th International Semantic Web Conference (ISWC 2015) Research, Bethlehem, Pennsylvania, USA, October 11-15, 2015.

18. Member in the Program Committee (PC) of the 11th International Conference on Semantic Systems (SEMANTiCS 2015), Vienna, Austria, September 15-17, 2015.

19. Member in the Program Committee (PC) of the 6th International Conference on Emerging Ubiquitous Systems andPervasive Networks (EUSPN-2015), Berlin, Germany, September 27-30, 2015.

20. Member in the Program Committee (PC) of the 12th ESWC 2015, Research Track, Portoroz, Slovenia, May 31 - June 4, 2015.

21. Member in the Program Committee (PC) of the 12th ESWC 2015, Posters and Demonstrations Track, Portoroz, Slovenia, May 31 - June 4, 2015.

22. Member in the Program Committee (PC) of the 9th International Conference on Advances in Semantic Processing (SEMAPRO 2015), Nice, France, July 19-24, 2015.

23. Member in the Program Committee (PC) of the 9th International Symposium on Rules: RuleML-2014 (RuleML-2015), Berlin, Germany, August 3-5, 2015.

24. Member in the Program Committee (PC) of the 19th International Conference on Knowledge Engineering and Knowledge Management (EKAW 2014), Linkoping, Sweden, November 24-28, 2014.

25. Member in the Program Committee (PC) of the 5th International Workshop on Software Knowledge (SKY 2014), in conjunction with the International Joint Conference on Knowledge Discovery, Knowledge Engineering and Knowledge Management - IC3K 2014, Rome, Italy, October 22nd, 2014.

26. Member in the Program Committee (PC) of the 5th Workshop on Web-scale Knowledge Representation, Retrieval, and Reasoning (Web-KR 2014), in conjunction with the 23rd ACM International Conference on Information and Knowledge Management (CIKM 2014) in Shanghai, China, November 3rd, 2014.

27. Member in the Program Committee (PC) of the 13th International Semantic Web Conference (ISWC 2014), Trentino, Italy, October 19-23, 2014.

28. Member in the Program Committee (PC) of the 8th International Conference on Advances in Semantic Processing (SEMAPRO 2014), Rome, Italy, August 24-28, 2014.

29. Member in the Program Committee (PC) of the 5th Conference on Knowledge Engineering and Semantic Web (KESW 2014), Kazan, Russia, September 29 - October 1, 2014.

30. Member in the Program Committee (PC) of the 8th International Symposium on Rules: RuleML-2014 (RuleML-2014), Prague, Czech Republic, August 18-20, 2014.

31. Member in the Program Committee (PC) of the 11th ESWC 2014, Anissaras/Hersonissou, Crete, Greece, May 25-29, 2014.

32. Member in the Program Committee (PC) of the 2nd International Workshop on Finance and Economics on the Semantic Web (FEOSW 2014), in conjunction with ESWC 2014, Anissaras/Hersonissou, Crete, Greece, May 25-29, 2014.

33. Member in the Program Committee (PC) of the 3rd Joint International Semantic Technology Conference (JIST'13), Seoul, South Korea, November 28-30, 2013.

34. Member in the Program Committee (PC) of the 9th International Conference on Next Generation Web Services Practices (NWeSP'13), Casablanca, Marocco, December 7-8, 2013.

35. Member in the Program Committee (PC) of the 4th Workshop on Web-scale Knowledge Representation, Retrieval, and Reasoning (Web-KR 2013), in conjunction with the 22st ACM International Conference on Information and Knowledge Management (CIKM 2013), Burlingame, CA, USA, November 1st, 2013.

36. Member in the Program Committee (PC) of the 4th Conference on Knowledge Engineering and Semantic Web (KESW), Saint-Petersburg, Russia, October 7-9, 2013.

37. Member in the Program Committee (PC) of the 12th International Conference WWW/Internet, Texas, U.S., October 5-8, 2013.

38. Member in the Program Committee (PC) of the 7th International Symposium on Rules: RuleML-2013 Challenge (ruleml2013challenge), Seattle, U.S. , July 11-13, 2013.

39. Member in the Program Committee (PC) of the 2nd Workshop on Formal Semantics for the Future Enterprise (FSFE 2013), in conjunction with the 16th International Conference on Business Information Systems (BIS 2013), Poznan, Poland June 19-21, 2013.

40. Member in the Program Committee (PC) of the 7th International Conference on Digital Society (ICDS 2013), Nice, France, February 24-March 1, 2013.

41. Member in the Program Committee (PC) of the 10th International Conference WWW/Internet, Madrid, Spain, October 18-21, 2012.

42. Member in the Program Committee (PC) of the 6th IEEE International Conference on Semantic Computing} (ICSC 2012), Palermo, Italy, September 19-21, 2012.

43. Member in the Program Committee (PC) of the 9th Extended Semantic Web Conference (ESWC 2012), Services, Processes and Software Track, Heraklion, Greece, May 27 - 31, 2012.

44. Member in the Program Committee (PC) of the 1st Workshop on Formal Semantics for the Future Enterprise (FSFE 2012), in conjunction with the 15th International Conference on Business Information Systems (BIS 2012), Vilnius, Lithuania, May 21-23, 2012.

45. Member in the Program Committee (PC) of the 10th International Conference WWW/Internet, Rio de Janeiro, Brazil, November 5-8, 2011.

46. Member in the Program Committee (PC) of the 7th International Conference on Next Generation Web Services Practices (NWeSP 2011), Salamanca, Spain, October 19-21, 2011

47. Member in the Program Committee (PC) of the 3rd International Conference on Computational Aspects of Social Networks (CASoN 2011), Salamanca, Spain, October 19-21, 2011.

48. Member in the Program Committee (PC) of the 5th IEEE International Conference on Semantic Computing} (ICSC 2011), Stanford University, Palo Alto, CA, USA, September 18-21, 2011.

49. Member in the Program Committee (PC) of the 3rd Conference on Semantic Technology and Knowledge Engineering (STAKE 2011), Kuching, Sarawak, Malaysia, July 20-22, 2011.

50. Member in the Program Committee (PC) of the 5th International Workshop on Architectures, Concepts and Technologies for Service Oriented Computing (ACT4SOC 2011) in conjunction with 6th International Conference on Software and Data Technologies (ICSOFT 2011), Seville, Spain, July 18-21, 2011.

51. Member in the Program Committee (PC) of the 6th Multi-Conference on Computing in the Global Information Technology(ICCGI 2011), Luxembourg, June 19-24, 2011.

52. Member in the Program Committee (PC) of the 8th Extended Semantic Web Conference (ESWC 2011), Services, Processes and Software Track, Heraklion, Greece, May 29 - June 2, 2011.

53. Member in the Program Committee (PC) of the 3rd International Conference on Intensive Applications and Services (INTENSIVE11) , Venice, Italy, May 22-27, 2011.

54. Member in the Program Committee (PC) of the 1st Workshop on Environmental Information Systems and Services Infrastructures and Platforms (ENVIP 2010), workshop in conjunction with the 24th International Conference on Informatics for Environmental Protection, Bonn/Cologne, Germany, October 6-8, 2010.

55. Member in the Program Committee (PC) of the 6th International Conference on Next Generation Web (NWESP 2010), Goa, India, December 14-15, 2010.

56. Member in the Program Committee (PC) of the IEEE International Conference on Service-Oriented Computing and Applications (SOCA 2010), Perth, Australia, December 14-15, 2010.

57. Member in the Program Committee (PC) of the 9th International Conference WWW/Internet, Timisoara, Romania, October 14-17, 2010.

58. Member in the Program Committee (PC) of the 4th IEEE International Conference on Semantic Computing (ICSC 2010), Carnegie Mellon University, Pittsburgh, PA, USA, September 22-24, 2010.

59. Member in the Program Committee (PC) of the 5th International Multi-Conference on Computing in the Global Information Technology (ICCGI 2010), September 20-25, 2010, Valencia, Spain

60. Member in the Program Committee (PC) of the 2nd Conference on Semantic Technology and Knowl- edge Engineering (STAKE 2010), Kuching, Sarawak, Malaysia, July 28-30, 2010.

61. Member in the Program Committee (PC) of the 4th MDA4ServiceCloud2010 - Modeling, Design, and Analysis for the Service Cloud workshop, co-located with the 6th European Conference on Modeling Foundations and Applications (ECMFA 2010), Paris, France, July 15, 2010.

62. Member in the Program Committee (PC) of the 1st Workshop on Service Web Engineering co-located with the 10th International Conference on Web Engineering (ICWE 2010), Vienna, Austria, July 5-9, 2010.

63. Member in the Program Committee (PC) of the RoSOC-M 2010 - International Workshop on the Role of Services, Ontologies, and Context in Mobile Environments, workshop in conjunction with the 11th International Conference on Mobile Data Management (MDM 2010), Kansas City, Missouri, USA, May 23, 2010.

64. Member in the Program Committee (PC) of the 1st Workshop on Enterprise Service Web (ESW 2010), workshop in conjunction with the 13th International Conference on Business Information Systems (BIS 2010), Berlin, Germany, May 3-5, 2010.

65. Member in the Program Committee (PC) of the 4th Asian Semantic Web Conference (ASWC 2009), Shanghai, China, December 6-9, 2009.

66. Member in the Program Committee (PC) of the 2nd Service Matchmaking and Resource Retrieval in the Semantic Web Workshop (SMR2), co-located with the 8th International Semantic Web Conference (ISWC 2009), Washington D.C., USA, October 25, 2009.

67. Member in the Program Committee (PC) of the International Conference on Database and Expert Systems Applications (DEXA 2010), 30 August - 3 September 2010, Bilbao, Spain.

68. Member in the Program Committee (PC) of the 4th International Conference on Digital Society (ICDS 2010), St. Maarten, Netherlands Antilles, February 10-15, 2010.

69. Member in the Program Committee (PC) of the Beyond SAWSDL’09, workshop in conjunction with the On The Move Conference (OTM 2009) Vilamoura, Portugal,November 1-6, 2009.

70. Member in the Editorial Board of International Journal on Advances in Internet Technologies. ISSN: 1942-2652.

71. Member in the Program Committee (PC) of the RoSOC-M 2009 - International Workshop on the Role of Services, Ontologies, and Context in Mobile Environments, workshop in conjunction with the 10th International Conference on Mobile Data Management (MDM 2009), Taipei, Taiwan May 18-21, 2009.

72. Member in the Program Committee (PC) of the International Conference on Database and Expert Systems Applications (DEXA 2009), 31 August - 4 September 2009, Linz, Austria.

73. Member in the Program Committee (PC) of the 4nd International Multi-Conference on Computing in the Global Information Technology (ICCGI 2009), Cap Esterel, France, August 25-31, 2009.

74. Member in the Program Committee (PC) of the 1st International Conference on Intensive Applications and Services (INTENSIVE 2009)), Valencia, Spain, April 21-25, 2009.

75. Member in the Program Committee (CP) of the 4th International Conference on Internet and Web Applications and Services (ICIW09), Venice, Italy, May 24-28, 2009.

76. Member in the Program Committee (PC) of the 1st Data Semantics in Social Computing Systems DISCo08 workshop in conjunction with the On The Move Conference (OTM 2008) Monterrey, Mexico, November 9-14, 2008.

77. Member in the Program Committee (PC) of the BPM 2.0 - Semantic Web and Web 2.0 Meet BPM:Semantics in Business and Scientific Processes workshop, in conjunction with the 6th International Conference on Business Process Management(BPM 2008) 1-4 September 2008 Milan, Italy.

78. Member in the Program Committee (PC) of the Intl Workshop on the Role of Services, Ontologies, and Context in Mobile Environments (RoSOC-M 08), in conjunction with the 9th International Conference on Mobile Data Management (MDM\9208) April 27, 2008, Beijing, China.

79. Member in the Program Committee (PC) of the 3nd International Multi-Conference on Computing in the Global Information Technology (ICCGI 2008), July 27 - August 1, 2008, Athens, Greece.

80. Member in the Program Committee (PC) of Special Issue on Mobile Services and Ontologies, International Journal on Semantic Web and Information Systems (SI-IJSWIS'08), Vol.4, Issue 2, 2008.

81. Member in the Program Committee (PC) of the 4th International Conference WWW/Internet, Vila Real, Portugal, October 5-8, 2007.

82. Member in the Program Committee (PC) of the Advances in Semantics for Web services 2007 workshop (semantics4ws 2007), co-located with the 5th International Conference on Business Process Management (BPM 2007) in Brisbane, Australia, September 24, 2007.

83. Member in the Technical Program Committee (TCP) of the Web Service-based Systems and Applications track at The International Conference on Internet and Web Applications and Services 2007, Mauritius, May 13-19, 2007.

84. Member in the Program Committee (PC) of the Modeling, Design, and Analysis for Service-oriented Architecture Workshop (mda4soa'07) workshop, co-located with the 2007 IEEE International Conferences on Services Computing (SCC 2007) and Web Services (ICWS 2007), Salt Lake City, Utah, USA, July 13, 2007.

85. Member in the Program Committee (PC) of the Mobile Services and Ontologies (MoSO 2007) workshop, at the 8th International Conference on Mobile Data Management (MDM'07) in Mannheim, Germany, May 7-11, 2007.

86. Member in the Program Committee (PC) of the 2nd International Multi-Conference on Computing in the Global Information Technology (ICCGI 2007), March 4-9, 2007, Guadeloupe, French Caribbean.

87. Member in the Program Committee (PC) of the 2nd International Workshop on Service Composition (sercomp'06), in conjunction with the 2006 IEEE/WIC/ACM International Conference on Web Intelligence (WI 2006), December 18, 2006, Hong Kong, China.

88. Member in the Program Committee (PC) of the 1st international workshop Applications and Business Aspects of the Semantic Web (SEBIZ 2006), co-located with the 5th International Semantic Web Conference (ISWC 2006), November 5 - 9, 2006, Athens, Georgia, USA.

89. Member in the Program Committee (PC) of the conference Semantics 2006, Vienna, Austria, November 28-30, 2006.

90. Member in the Program Committee (PC) of the 3rd International Conference WWW/Internet, Murcia, Spain, October 5-8, 2006.

91. Member in the Program Committee (PC) of the Modeling, Design, and Analysis for Service-oriented Architecture Workshop (mda4soa 2006) workshop, co-located with the 2006 IEEE International Conferences on Services Computing (SCC 2006) and Web Services (ICWS 2006), Chicago, USA, September 18, 2006.

92. Member in the Program Committee (PC) of the Advances in Semantics for Web services 2006 (semantics4ws 2006) workshop, co-located with the 4th International Conference on Business Process Management (BPM 2006) in Vienna, Austria, September 5-7, 2006.

93. Member in the Program Committee (PC) of the 1st International Multi-Conference on Computing in the Global Information Technology (ICCGI 2006), Bucharest, Romania, August 1-3, 2006

94. Member in the Program Committee (PC) of the Mobile Services and Ontologies (MoSO 2006) workshop, at the 7th International Conference on Mobile Data Management (MDM 2006) in Nara, Japan, May 8-12, 2006.

95. Member in the Technical Program Committee (TCP) of the Web Service-based Systems and Applications track at the International Conference on Internet and Web Applications and Services (ICIW06), Guadeloupe, French Caribbean, February 23-25, 2006.

96. Member in the Program Committee (PC) of the workshopWWW Service Composition with Semantic Web Services (wscomps05), at The 2005 IEEE/WIC/ACM International Conference on Web Intelligence and Intelligent Agent Technology,Compiegne, France, September 19, 2005.

97. Member in the Program Committee (PC) of the 1st International Workshop on Web Service Choreography and Orchestration for Business Process Management, at the 3rd International Conference On Business Process Management (BPM 2005), Nancy, France, September 5, 2005.

Reviews in journals

1. Knowledge-Based Systems Journal

2. International Journal of Pattern Recognition and Artificial Intelligence

3. Journal of Web Semantics

4. World Wide Web Journal - Internet and Web Information Systems

Invited Talks

1. Invited Lecturer 5th Data Science and AI International Summer School Predeal, Romania, July 20-28, 2024.

2. Invited Lecturer 4th Data Science International Summer School, Predeal, Romania, July 20 - 28, 2023.

3. Invited Speaker: Conversational AI powered by Knowledge Graphs in the era of ChatGPT, at AI meets complex knowledge structures: Neuro-Symbolic AI and Graph Tech, Oslo, Norway, March 16, 2023.

4. Invited Speaker: Knowledge-based Conversational AI for Tourism, ConnectAI, January 25-27, 2022.

5. Invited Lecturer 1st Data Science International Summer School, Predeal, Romania, August 24 - 31, 2018.

6. Invited Lecturer on Semantic Web, RDF, SPARQL, Semantic Web Services Winter Retreat, Seefeld, Tirol, Austria, March 1 - 7, 2009.

7. Invited Lecturer on Semantic Web Services, Asian Semantic Web School, Bangkok, Thailand, December 8 - 12, 2008.

8. Invited Speaker Modeling QoS characteristics in Web Service Modeling Ontology (WSMO), Swinburne University, Melbourne, Australia, November 29, 2006.

9. Invited Lecturer - Semantic Web Services with the Web Service Modeling Ontology - WSMO at the 7th edition of the EuroLAN Summer School Cluj-Napoca, Romania, August 2, 2005.

10. Invited Speaker at Semantics 2005 - Semantic Systems in the Knowledge Society - Challenges and Opportunities, Semantics2005, Vienna, Austria, November 24, 2005.

Research visits

1. October 2008 - December 2008, Asian Institute of Technology, Bangkok, Thailand.

2. February 2007, Stanford University, Computer Science Department, Stanford, USA.

3. November 2004 - December 2004, National University of Ireland, Galway, Ireland.

4. March 2002 - August 2002, National University of Singapore, Computer Science Department, Singapore.

Awards

1. FIT-IT "Sematic Systems" 2nd Call, 2nd price for the project "GRISINO Grid Semantics and Intelligent Objects", 2005.