International Conference "Digital Presentation and Preservation of Cultural and Scientific Heritage" - DiPP2011, DiPP2012, DiPP2013, DiPP2014, DiPP2015, DiPP2016, DiPP2017(Chair)
LOGOS Open Workshop “Cross-Media and Personalized Learning Applications on top of Digital Libraries” (LADL 2007), in conj. with the 11th European Conference on Research and Advanced Technology for Digital Libraries (ECDL 2007), 20 September, 2007, Budapest, Hungary (2007) – (Chair)
Jubilee International Conference “Mathematical and Computational Linguistics”, 6 July, 2007, Sofia, Bulgaria (Chairman)
HUBUSKA Open Workshop „Methods and Tools for Development of Semantic-enabled Systems and Services for Multimedia Content, Interoperability and Reusability”, Klagenfurt, Austria (27-28 April, 2006) (Co-Chairperson)
Programme committee of the International Conference on Intelligent Information and Engeneering Systems (INFOS 2008) (June 23 – July 03, 2008 - Varna Bulgaria)
Programme committee of the International Conference on Intelligent Information and Engeneering Systems (INFOS 2009) (June 22 – July 02, 2009, Varna, Bulgaria & September 15-19, 2009 - Rzeszow – Bieszczady, Poland)
Programme committee of the International Conference on Intelligent Information and Engeneering Systems (INFOS 2010) (September 20-24, 2010 - Krynica, Poland)
Programme committee of the International Conference on Information Research and Applications (i.Tech 2005, i.Tech 2006, i.Tech 2007, i.Tech 2008, i.Tech 2010), (2005, 2006, 2007, 2008, 2010 – Varna, Bulgaria)
Programme committee of the International Conference on Information Research and Applications (i.Tech 2009), (June 22 – July, 2009 – Varna, Bulgaria& September 02-05, 2009 – Madrid, Spain)
Programme committee of the International Conference Modern (e-)Learning, Varna Bulgaria (MeL 2006), Varna, Bulgaria (July 01-05, 2006)
Programme committee of the International Conference e-Management & Business Intelligence (eM&BI 2007, eM&BI 2008), Varna, Bulgaria (2007, 2008)
Programme committee of the LOGOS Open Workshop “Cross-Media and Personalized Learning Applications with Intelligent Content” (LAIC 2008), Varna, Bulgaria (03 September, 2008)
Programme committee of the LOGOS Open Conference “New Technology Platforms for Learning – Revisited”, Budapest, Hungary (19-20 January, 2009)
Programme committee of the KNOSOS-CHIRON Open Workshop „e-Learning Solutions – On the Way to Ubiquitous Applications”, Sandanski, Bulgaria (May 26-27, 2005)
Programme committee of the CHIRON Open Workshop „Visions of Ubiquitous Learning”, Stockholm, Sweden (20 June, 2006)
Programme committee of the CHIRON Open Workshop „Ubiquitous Learning Challenges: Design, Experiments and Context Aware Ubiquitous Learning”, Turin, Italy (20-21 September, 2006)
Programme committee of the HUBISKA Open Workshop “Technology-enhanced Learning with Ubiquitous Applications of Integrated Web, Digital TV and Mobile Technologies”, in conj. With 6th eLearning Forum, Budapest, Hungary (9-10 June, 2005)
Programme committee of the HUBUSKA Open Workshop „Generic Issues of Knowledge Technologies”, Budapest, Hungary (14 September, 2005)
Programme committee of the HUBUSKA Open Workshop „Semantic Web and Knowledge Technologies Applications”, Varna, Bulgaria (12 September, 2006)
Programme committee of the HUBUSKA Open Workshop „Knowledge Technologies and Applications”, Kosice, Slovakia (31 May – 1 June, 2007)
Programme committee of the International Conference on SOFTWARE, SERVICES & SEMANTIC TECHNOLOGIES, Sofia, Bulgaria (October 28-29, 2009).
Programme committee of the Second International Conference on SOFTWARE, SERVICES & SEMANTIC TECHNOLOGIES, Varna, Bulgaria (September 11-12, 2010).
Programme committee of the 12th International Conference, Artificial Intelligence: Methodology, Systems, and Applications (AIMSA 2006, AIMSA 2008), Varna, Bulgaria (September 12-15, 2006; September 4-6, 2008).
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