@conference {838,
	title = {Estimating MPdist with SAX and Machine Learning},
	booktitle = {New Trends in Database and Information Systems (Proceedings of ADBIS 2024, Short Papers, Workshops, Doctoral Consortium and Tutorials)},
	year = {2024},
	publisher = {Springer Cham},
	organization = {Springer Cham},
	abstract = {<p>MPdist is a distance measure which considers two time series to be similar if they share many similar subsequences. However, computing MPdist can be slow, especially for large time series. We propose a technique for the approximate computation of MPdist that uses the SAX representation of the time series to quickly estimate the Nearest Neighbor (NN) distance of each subsequence, and then applies a Machine Learning model to correct the accuracy loss incurred. Our method is orders of magnitude faster than the exact computation of MPdist; at the same time, our best approximation computes the NN of a time series with high accuracy. A thorough evaluation of our technique is provided.</p>
},
	keywords = {Distance metric, Machine Learning, MPdist, Random Forest, SAX, Time series},
	doi = {https://doi.org/10.1007/978-3-031-70421-5_32},
	author = {Mihalis Tsoukalos and Pantelis Chronis and Nikos Platis and Costas Vassilakis},
	editor = {Joe Tekli and Johann Gamper and Richard Chbeir and Yannis Manolopoulos and Salma Sassi and Mirjana Ivanovic and Vargas-Solar, Genoveva and Ester Zumpano}
}
@conference {DBLP:conf/debs/ChantziosZST19,
	title = {Ping - A customizable, open-source information filtering system for textual data},
	booktitle = {Proceedings of the 13th ACM International Conference on Distributed and Event-based Systems, DEBS 2019, Darmstadt, Germany, June 24-28, 2019.},
	year = {2019},
	pages = {228{\textendash}231},
	doi = {10.1145/3328905.3332512},
	url = {https://doi.org/10.1145/3328905.3332512},
	author = {Thanasis Chantzios and Lefteris Zervakis and Spiros Skiadopoulos and Christos Tryfonopoulos}
}
@conference {588,
	title = {The quest for the appropriate cyber-threat intelligence sharing platform},
	booktitle = {Proceedings of the 8th International Conference on Data Science, Technology and Applications (DATA), Prague, Czech Republic},
	year = {2019},
	month = { 07/2009},
	abstract = {Cyber-threat intelligence (CTI) is any information that can help an organization identify, assess, monitor, and respond to cyber-threats. It relates to all cyber components of an organization such as networks, computers, and other types of information technology. In the recent years, due to the major increase of cyber-threats, CTI sharing is becoming increasingly important both as a subject of research and as a concept of providing additional security to organizations. However, selecting the proper tools and platforms for CTI sharing, is a challenging task, that pertains to a variety of aspects. In this paper, we start by overviewing the CTI procedure (threat types, categories, sources and the general CTI life-cycle). Then, we present a set of seven high-level CTI platform recommendations that can be used to evaluate a platform and subsequently we survey six state-of- the-art cyber-threat intelligence platforms. Finally, we compare and evaluate the six aforementioned platforms by means of the earlier proposed recommendations.},
	keywords = {Cyber-threat, Intelligence, Sharing},
	url = {http://users.uop.gr/~trifon/papers/pdf/data19-CKSKTBK.pdf},
	author = {Thanasis Chantzios and Paris Koloveas and Spiros Skiadopoulos and Nikos Kolokotronis and Christos Tryfonopoulos and Vasiliki-Georgia Bilali and Dimitris Kavallieros}
}
@proceedings {590,
	title = {SciTo trends: visualising scientific topic trends},
	year = {2019},
	month = {September},
	author = {Serafeim Chatzopoulos and Panagiotis Deligiannis and Thanasis Vergoulis and Ilias Kanellos and Christos Tryfonopoulos and Theodore Dalamagas}
}
@article {DBLP:journals/bdr/Chatzigeorgakidis19,
	title = {Visual Exploration of Geolocated Time Series with Hybrid Indexing},
	journal = {Big Data Research},
	volume = {15},
	year = {2019},
	pages = {12{\textendash}28},
	doi = {10.1016/j.bdr.2019.02.001},
	url = {https://doi.org/10.1016/j.bdr.2019.02.001},
	author = {Georgios Chatzigeorgakidis and Kostas Patroumpas and Dimitrios Skoutas and Spiros Athanasiou and Spiros Skiadopoulos}
}
@conference {mathas2018a,
	title = {Evaluation of Apache Spot\textquotesingles machine learning capabilities in an SDN/NFV enabled environment},
	booktitle = {Proceedings of the 13th International Conference on Availability, Reliability and Security - ARES 2018},
	year = {2018},
	publisher = {ACM Press},
	organization = {ACM Press},
	abstract = {Software Defined Networking (SDN) and Network Function Virtualisation (NFV) are transforming modern networks towards a service-oriented architecture. At the same time, the cybersecurity industry is rapidly adopting Machine Learning (ML) algorithms to improve detection and mitigation of complex attacks. Traditional intrusion detection systems perform signature-based detection, based on well-known malicious traffic patterns that signify potential attacks. The main drawback of this method is that attack patterns need to be known in advance and signatures must be preconfigured. Hence, typical systems fail to detect a zero-day attack or an attack with unknown signature. This work considers the use of machine learning for advanced anomaly detection, and specifically deploys the Apache Spot ML framework on an SDN/NFV-enabled testbed running cybersecurity services as Virtual Network Functions (VNFs). VNFs are used to capture traffic for ingestion by the ML algorithm and apply mitigation measures in case of a detected anomaly. Apache Spot utilises Latent Dirichlet Allocation to identify anomalous traffic patterns in Netflow, DNS and proxy data. We evaluate the overall performance of Apache Spot by deploying Denial of Service (Slowloris, BoNeSi) and a Data Exfiltration attack (iodine).},
	keywords = {Apache Spot, Latent Dirichlet Allocation, Machine Learning, Network Function Virtualisation, Penetration Testing, SHIELD Project�, Software Defined Networking},
	doi = {10.1145/3230833.3233278},
	author = {Christos M. Mathas and Olga E. Segou and Georgios Xylouris and Dimitris Christinakis and Michail-Alexandros Kourtis and Costas Vassilakis and Anastasios Kourtis}
}
@article {DBLP:journals/jbd/Chatzigeorgakidis18,
	title = {FML-kNN: scalable machine learning on Big Data using \emphk-nearest neighbor joins},
	journal = {J. Big Data},
	volume = {5},
	year = {2018},
	pages = {4},
	doi = {10.1186/s40537-018-0115-x},
	url = {https://doi.org/10.1186/s40537-018-0115-x},
	author = {Georgios Chatzigeorgakidis and Sophia Karagiorgou and Spiros Athanasiou and Spiros Skiadopoulos}
}
@conference {DBLP:conf/edbt/Chatzigeorgakidis18,
	title = {Map-Based Visual Exploration of Geolocated Time Series},
	booktitle = {Proceedings of the Workshops of the EDBT/ICDT 2018 Joint Conference (EDBT/ICDT 2018), Vienna, Austria, March 26, 2018.},
	year = {2018},
	pages = {92{\textendash}99},
	url = {http://ceur-ws.org/Vol-2083/paper-14.pdf},
	author = {Georgios Chatzigeorgakidis and Dimitrios Skoutas and Kostas Patroumpas and Spiros Athanasiou and Spiros Skiadopoulos}
}
@conference {DBLP:conf/gis/Chatzigeorgakidis18,
	title = {Scalable hybrid similarity join over geolocated time series},
	booktitle = {Proceedings of the 26th ACM SIGSPATIAL International Conference on Advances in Geographic Information Systems, SIGSPATIAL 2018, Seattle, WA, USA, November 06-09, 2018},
	year = {2018},
	pages = {119{\textendash}128},
	doi = {10.1145/3274895.3274949},
	url = {https://doi.org/10.1145/3274895.3274949},
	author = {Georgios Chatzigeorgakidis and Kostas Patroumpas and Dimitrios Skoutas and Spiros Athanasiou and Spiros Skiadopoulos}
}
@conference {DBLP:conf/pakdd/ChronisGAS18,
	title = {Unsupervised Disaggregation of Low Granularity Resource Consumption Time Series},
	booktitle = {Advances in Knowledge Discovery and Data Mining - 22nd Pacific-Asia Conference, PAKDD 2018, Melbourne, VIC, Australia, June 3-6, 2018, Proceedings, Part II},
	year = {2018},
	pages = {558{\textendash}570},
	doi = {10.1007/978-3-319-93037-4_44},
	url = {https://doi.org/10.1007/978-3-319-93037-4_44},
	author = {Pantelis Chronis and Giorgos Giannopoulos and Spiros Athanasiou and Spiros Skiadopoulos}
}
@conference {DBLP:conf/gis/Chatzigeorgakidis17,
	title = {Indexing Geolocated Time Series Data},
	booktitle = {Proceedings of the 25th ACM SIGSPATIAL International Conference on Advances in Geographic Information Systems, GIS 2017, Redondo Beach, CA, USA, November 7-10, 2017},
	year = {2017},
	pages = {19:1{\textendash}19:10},
	doi = {10.1145/3139958.3140003},
	url = {https://doi.org/10.1145/3139958.3140003},
	author = {Georgios Chatzigeorgakidis and Dimitrios Skoutas and Kostas Patroumpas and Spiros Athanasiou and Spiros Skiadopoulos}
}
@conference {591,
	title = {A crawler architecture for harvesting the clear, social, and dark web for IoT-related cyber-threat intelligence},
	booktitle = {In Proceedings of the IEEE Workshop on Cyber Security \& Resilience in the Internet of Things (CSRIoT @ IEEE Services)},
	year = {2016},
	month = {July 2016},
	publisher = {IEEE},
	organization = {IEEE},
	address = {Milan, Italy},
	abstract = {The clear, social, and dark web have lately been identified as rich sources of valuable cyber-security information that {\textendash}given the appropriate tools and methods{\textendash} may be identified, crawled and subsequently leveraged to actionable cyber- threat intelligence. In this work, we focus on the information gathering task, and present a novel crawling architecture for transparently harvesting data from security websites in the clear web, security forums in the social web, and hacker fo- rums/marketplaces in the dark web. The proposed architecture adopts a two-phase approach to data harvesting. Initially a machine learning-based crawler is used to direct the harvesting towards websites of interest, while in the second phase state- of-the-art statistical language modelling techniques are used to represent the harvested information in a latent low-dimensional feature space and rank it based on its potential relevance to the task at hand. The proposed architecture is realised using exclusively open-source tools, and a preliminary evaluation with crowdsourced results demonstrates its effectiveness.},
	keywords = {crawling architecture, cyber-security, cyber-threat intelligence, IoT, language models, Machine Learning},
	url = {http://users.uop.gr/ trifon/papers/pdf/csriot19-KCTS.pdf},
	author = {Paris Koloveas and Thanasis Chantzios and Christos Tryfonopoulos and Spiros Skiadopoulos}
}
@conference {DBLP:conf/bigdataconf/Chatzigeorgakidis15,
	title = {A MapReduce based k-NN joins probabilistic classifier},
	booktitle = {2015 IEEE International Conference on Big Data, Big Data 2015, Santa Clara, CA, USA, October 29 - November 1, 2015},
	year = {2015},
	pages = {952{\textendash}957},
	doi = {10.1109/BigData.2015.7363844},
	url = {https://doi.org/10.1109/BigData.2015.7363844},
	author = {Georgios Chatzigeorgakidis and Sophia Karagiorgou and Spiros Athanasiou and Spiros Skiadopoulos}
}
@proceedings {DBLP:conf/edbt/2014,
	title = {Proceedings of the 17th International Conference on Extending Database Technology, EDBT 2014, Athens, Greece, March 24-28, 2014},
	year = {2014},
	publisher = {OpenProceedings.org},
	url = {http://openproceedings.org/html/pages/2014_edbt.html},
	editor = {Sihem Amer-Yahia and Vassilis Christophides and Anastasios Kementsietsidis and Minos N. Garofalakis and Stratos Idreos and Vincent Leroy}
}
@proceedings {DBLP:conf/icdm/2013w,
	title = {13th IEEE International Conference on Data Mining Workshops, ICDM Workshops, TX, USA, December 7-10, 2013},
	year = {2013},
	publisher = {IEEE Computer Society},
	isbn = {978-0-7695-5109-8},
	url = {http://ieeexplore.ieee.org/xpl/mostRecentIssue.jsp?punumber=6732242},
	editor = {Wei Ding and Takashi Washio and Hui Xiong and George Karypis and Bhavani M. Thuraisingham and Diane J. Cook and Xindong Wu}
}
@conference {masie2013,
	title = {Improving museum visitors{\textquoteright} Quality of Experience through intelligent recommendations: A visiting style-based approach},
	booktitle = {Proceedings of MASIE 2013 Workshop, co-located with the 9th International Conference on Intelligent Environments IE{\textquoteright}13},
	year = {2013},
	month = {7},
	address = {Athens, GR},
	abstract = {This paper investigates the effect that smart routing and recommendations can have on improving the Quality of Experience of museum visitors. The novelty of our approach consists of taking into account not only user interests but also their visiting styles, as well as modeling the museum not as a sterile space but as a location where crowds meet and interact, impacting each visitor?s Quality of Experience. The investigation is done by an empirical study on data gathered by a custom-made simulator tailored for the museum user routing problem. Results are promising and future potential and directions are discussed.},
	doi = {10.3233/978-1-61499-286-8-507},
	author = {Ioanna Lykourentzou and Claude, X. and Y. Naudet and Tobias, E. and Angela Antoniou and Giorgos Lepouras and Costas Vassilakis}
}
@article {dix2010b,
	title = {From the web of data to a world of action},
	journal = {Journal of Web Semantics},
	volume = {8 issue 4},
	year = {2010},
	pages = {394-408},
	abstract = {This paper takes as its premise that the web is a place of action, not just information, and that the purpose of global data is to serve human needs. The paper presents several component technologies, which together work towards a vision where many small micro-applications can be threaded together using automated assistance to enable a unified and rich interaction. These technologies include data detector technology to enable any text to become a start point of semantic interaction; annotations for web-based services so that they can link data to potential actions; spreading activation over personal ontologies, to allow modelling of context; algorithms for automatically inferring {\textquoteleft}typing{\textquoteright} of web-form input data based on previous user inputs; and early work on inferring task structures from action traces. Some of these have already been integrated within an experimental web-based (extended) bookmarking tool, Snip!t, and a prototype desktop application On Time, and the paper discusses how the components could be more fully, yet more openly, linked in terms of both architecture and interaction. As well as contributing to the goal of an action and activity-focused web, the work also exposes a number of broader issues, theoretical, practical, social and economic, for the Semantic Web.},
	doi = {10.1016/j.websem.2010.04.007},
	author = {Alan Dix and Giorgos Lepouras and Akrivi Katifori and Costas Vassilakis and Tiziana Catarci and Antonella Poggi and Yannis Ioannidis and Miguel Morae and I. Daradimos and Nazihah Md.Akima and Shah Rukh Humayound and Fabio Terella}
}
@article {DBLP:journals/tkde/ClementiniSBT10,
	title = {A Reasoning System of Ternary Projective Relations},
	journal = {IEEE Trans. Knowl. Data Eng.},
	volume = {22},
	number = {2},
	year = {2010},
	pages = {161{\textendash}178},
	doi = {10.1109/TKDE.2009.79},
	url = {https://doi.org/10.1109/TKDE.2009.79},
	author = {Eliseo Clementini and Spiros Skiadopoulos and Roland Billen and Francesco Tarquini}
}
@conference {Katifori2008a1,
	title = {Personal Ontology Creation and Visualization for a Personal Interaction Management System},
	booktitle = {Proceedings of PIM, CHI 2008},
	year = {2008},
	month = {4},
	abstract = {Ontologies offer a flexible and expressive layer of abstraction, very useful for capturing the semantics of information repositories and facilitating their retrieval either by the user or by the system to support user tasks. This work presents an ontology-based user profiler, in the context of a Personal Interaction Management System (PIMS). The profiler, based on an ontology of the users? domain, enables them to create their personal ontology by initially choosing one of the available template ontologies as a starting point, which they subsequently populate and customize. The profiler employs a web interface which allows users to populate their personal ontology through forms, hiding ontology complexities and peculiarities. Forms are dynamically generated through ontology views, which are specified by ontology designers.},
	author = {Akrivi Katifori and Costas Vassilakis and I. Daradimos and Giorgos Lepouras and Yannis Ioannidis and Alan Dix and Antonella Poggi and Tiziana Catarci}
}
@article {DBLP:journals/dke/TerrovitisVSBCMR07,
	title = {Modeling and language support for the management of pattern-bases},
	journal = {Data Knowl. Eng.},
	volume = {62},
	number = {2},
	year = {2007},
	pages = {368{\textendash}397},
	doi = {10.1016/j.datak.2006.10.002},
	url = {https://doi.org/10.1016/j.datak.2006.10.002},
	author = {Manolis Terrovitis and Panos Vassiliadis and Spiros Skiadopoulos and Elisa Bertino and Barbara Catania and Anna Maddalena and Stefano Rizzi}
}
@proceedings {DBLP:conf/icde/2007,
	title = {Proceedings of the 23rd International Conference on Data Engineering, ICDE 2007, The Marmara Hotel, Istanbul, Turkey, April 15-20, 2007},
	year = {2007},
	publisher = {IEEE Computer Society},
	isbn = {1-4244-0802-4},
	url = {http://ieeexplore.ieee.org/xpl/mostRecentIssue.jsp?punumber=4221634},
	editor = {Rada Chirkova and Asuman Dogac and M. Tamer {\"O}zsu and Timos K. Sellis}
}
@inbook {lepbook2005a,
	title = {Adaptable and Adaptive Hypermedia Systems},
	year = {2005},
	pages = {190{\textendash}205},
	publisher = {IRM Press},
	organization = {IRM Press},
	chapter = {Adaptive Virtual Museums on the Web},
	abstract = {This chapter presents an architecture for supporting the creation of adaptive virtual reality museums on the web. It argues whether the task of developing adaptive virtual reality museums is a complex one, presenting key challenges, and should thus be facilitated by means of a supporting architecture and relevant tools. The proposed architecture is flexible enough to cater for a variety of user needs, and modular promoting extensibility, maintainability and tailorability. Adoption of this architecture will greatly simplify the development of adaptive virtual reality museums, reducing the needed effort to exhibit digitisation and user profile specification; user profiles are further refined dynamically through the user data recorder and the user modelling engine, which provide input for the virtual environment generator.},
	doi = {10.4018/978-1-59140-567-2.ch010},
	author = {Giorgos Lepouras and Costas Vassilakis},
	editor = {S. Y. Chen and G. D. Magoulas}
}
@proceedings {DBLP:conf/edbt/2004,
	title = {Advances in Database Technology - EDBT 2004, 9th International Conference on Extending Database Technology, Heraklion, Crete, Greece, March 14-18, 2004, Proceedings},
	volume = {2992},
	year = {2004},
	publisher = {Springer},
	isbn = {3-540-21200-0},
	doi = {10.1007/b95855},
	url = {https://doi.org/10.1007/b95855},
	editor = {Elisa Bertino and Stavros Christodoulakis and Dimitris Plexousakis and Vassilis Christophides and Manolis Koubarakis and Klemens B{\"o}hm and Elena Ferrari}
}
@conference {Weir2004152,
	title = {Content enrichment through dynamic annotation},
	booktitle = {ICEIS 2004 - Proceedings of the Sixth International Conference on Enterprise Information Systems},
	year = {2004},
	note = {cited By (since 1996) 0},
	month = {4},
	pages = {152-157},
	abstract = {This paper describes a technique for interceding between users and the information that they browse. This facility, that we term {\textquoteright}dynamic annotation{\textquoteright}, affords a means of editing Web page content {\textquoteright}on-the-fly{\textquoteright} between the source Web server and the requesting client. Thereby, we have a generic way of modifying the content displayed to local users by addition, removal or reorganising any information sourced from the World-Wide Web, whether this derives from local or remote pages. For some time, we have been exploring the scope for this device and we believe that it affords many potential worthwhile applications. Here, we describe two varieties of use. The first variety focuses on support for individual users in two contexts (second-language support and second language learning). The second variety of use focuses on support for groups of users. These differing applications have a common goal which is content enrichment of the materials placed before the user. Dynamic annotation provides a potent and flexible means to this end.},
	keywords = {Content based retrieval, Content enrichment, Dynamic annotation, Information analysis, Knowledge based systems, Learning systems, Servers, Web browsers, World Wide Web},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-8444234304\&partnerID=40\&md5=1ba0d141296de4e5b8bbd76ba0d1d79a},
	author = {G.R.S. Weir and Giorgos Lepouras and Costas Vassilakis},
	editor = {I. Seruca and J. Filipe and S. Hammoudi and J. Cordeiro}
}
@conference {DBLP:conf/ssdbm/TerrovitisVSBCM04,
	title = {Modeling and Language Support for the Management of Pattern-Bases},
	booktitle = {Proceedings of the 16th International Conference on Scientific and Statistical Database Management (SSDBM 2004), 21-23 June 2004, Santorini Island, Greece},
	year = {2004},
	pages = {265{\textendash}274},
	doi = {10.1109/SSDBM.2004.54},
	url = {http://doi.ieeecomputersociety.org/10.1109/SSDBM.2004.54},
	author = {Manolis Terrovitis and Panos Vassiliadis and Spiros Skiadopoulos and Elisa Bertino and Barbara Catania and Anna Maddalena}
}
@article {1009361,
	title = {Real exhibitions in a virtual museum},
	journal = {Virtual Reality},
	volume = {7},
	number = {2},
	year = {2004},
	pages = {120{\textendash}128},
	publisher = {Springer-Verlag},
	address = {London, UK},
	abstract = {When creating a virtual environment open to the public a number of challenges have to be addressed. The equipment has to be chosen carefully in order to be be able to withstand hard every-day usage, the application has not only to be robust and easy to use, but has also to be appealing to the user, etc. The current paper presents findings gathered from the creation of a multi-thematic virtual museum environment to be offered to visitors of real world museums. A number of design and implementation aspects are described along with an experiment designed to evaluate alternative approaches for implementing the navigation in a virtual museum environment. The paper is concluded with insights gained from the development of the Virtual Museum and portrays future research plans.},
	issn = {1359-4338},
	doi = {10.1007/s10055-004-0121-5},
	url = {https://link.springer.com/article/10.1007/s10055-004-0121-5},
	author = {Giorgos Lepouras and Akrivi Katifori and Costas Vassilakis and D. Charitos}
}
@conference {lep03a,
	title = {Facilitating VR Museums Web Presence},
	booktitle = {Proceedings of HCI 2003},
	year = {2003},
	month = {6},
	pages = {1143{\textendash}1147},
	abstract = {The paper presents an environment that enables museum curators to catalogue and publish on the web exhibits in multiple languages and media including 3D, video, images. The system is extendable to accommodate new media types, languages, exhibits, information categories, etc. Visitors have the potential to formulate dynamic personalised exhibit collections using search mechanisms provided by the system.},
	author = {Giorgos Lepouras and Akrivi Katifori and Costas Vassilakis and Anna Charissi}
}
@conference {lep2002a1,
	title = {SMARTGOV: A Governmental Knowledge-based Platform for Public Sector Online Services},
	booktitle = {Proceedings KMGov2002},
	year = {2002},
	month = {5},
	pages = {173{\textendash}185},
	address = {Copenhagen, Denmark},
	abstract = {Public transaction services (such as e-forms), although perceived the future of e-government have not yet realised their full potential. E-forms have a significant role in e-government, as they are the basis for realising most of the twenty public services that all European Union member states have to provide to their citizens and businesses. The aim of this paper is to present a knowledge-based platform to assist public sector employees to generate online transaction services by simplifying their development, maintenance and integration with already installed IT systems.},
	author = {E. Tambouris and G. Boukis and Costas Vassilakis and Giorgos Lepouras and S. Rouvas and Canadas, R. and Heredia, S. and Lopez Usero, J. C.}
}
@conference {599,
	title = {Agents in Decentralised Information Ecosystems: The DIET Approach},
	booktitle = {Symposium on Information Agents for E-Commerce, AISB Convention},
	year = {2001},
	month = {March},
	address = {University of York, United Kingdom},
	abstract = {The complexity of the current global information infrastructure requires novel means of understanding and exploiting the dynamics of information. One means may be through the concept of an information ecosystem. An information ecosystem is analogous to a natural ecosystem in which there are flows of materials and energy analogous to information flow between many interacting individuals. This paper describes a multi-agent platform, DIET (Decentralised Information Ecosystem Technologies) that can be used to implement open, robust, adaptive and scalable ecosystem-inspired systems. We describe the design principles of the DIET software architecture, and present a simple example application based upon it. We go on to consider how the DIET system can be used to develop information brokering agents, and how these can contribute to the implementation of economic interactions between agents, as well as identifying some open questions relating to research in these areas. In this way we show the capacity of the DIET system to support applications using information agents.},
	author = {P. Marrow and Manolis Koubarakis and R.H. van Lengen and F. Valverde-Albacete and E. Bonsma and J. Cid-Suerio and A.R. Figueiras-Vidal and A. Gallardo-Antolin and C. Hoile and T. Koutris and H. Molina-Bulla and A. Navia-Vazquez and Paraskevi Raftopoulou and N. Skarmeas and Christos Tryfonopoulos and F. Wang and C. Xiruhaki}
}
@conference {aisb01-MKL+,
	title = {Agents in Decentralised Information Ecosystems: The DIET Approach},
	booktitle = {Proccedings of the Symposium on Information Agents for E-Commerce, AISB Convention},
	year = {2001},
	month = {March},
	pages = {109{\textendash}117},
	address = {York, UK},
	author = {P. Marrow and Manolis Koubarakis and R.H. van Lengen and F. Valverde-Albacete and E. Bonsma and J. Cid-Suerio and A.R. Figueiras-Vidal and A. Gallardo-Antolin and C. Hoile and T. Koutris and H. Molina-Bulla and A. Navia-Vazquez and Paraskevi Raftopoulou and N. Skarmeas and Christos Tryfonopoulos and F. Wang and C. Xiruhaki}
}
@conference {Lep01a,
	title = {Building a VR - Museum in a Museum},
	booktitle = {Proceedings of the Third International Virtual Reality Conference, VRIC2001},
	year = {2001},
	month = {5},
	abstract = {Past years have seen the exploitation of multimedia techniques and lately the introduction of virtual reality methods to create new forms of presentation for museums{\textquoteright} exhibitions. Virtual Reality can offer a number of advantages to museums, offering a way to overcome some common problems like the lack of space or the need of visitors to interact with the exhibits. A broad categorisation of virtual museums reveals that they vary from fully immersive cave systems to simple multimedia presentations. In our approach to develop a virtual reality museum we have designed a virtual environment (VE) where guests can visit a total of ten different museums. The processes of digitisation, architectural design and exhibit presentation are outlined and points of particular importance are explained. Exhibits from the real world museums have been digitised and integrated in the VE. The system has been implemented in two versions: one fully immersive and one with a stereo display.},
	author = {Giorgos Lepouras and D. Charitos and Costas Vassilakis and Charissi, A. and Halatsi, L.}
}
@conference {Charitos2001284,
	title = {Designing a virtual museum within a museum},
	booktitle = {Proceedings VAST 2001 Virtual Reality, Archeology, and Cultural Heritage},
	year = {2001},
	note = {cited By (since 1996) 0},
	month = {11},
	pages = {284},
	abstract = {The designing of a virtual museum within a museum was discussed. In regard with it, the Virtual Museum project sponsored by the Greek General Secretariat of Research and Technology was presented. The project{\textquoteright}s main objective was to create a virtual environment (VE) for enhancing the experience of visiting a museum by affording view and manipulation of certain exhibits.},
	keywords = {Information retrieval systems, Internet, Museums, Technical presentations, Three dimensional computer graphics, Virtual museum, Virtual reality},
	doi = {10.1145/584993.585043},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0141426770\&partnerID=40\&md5=50066081a4e5d55bfc3c823813535add},
	author = {D. Charitos and Giorgos Lepouras and Costas Vassilakis and Akrivi Katifori and Charissi, A. and Halatsi, L.},
	editor = {S. N. Spencer}
}
@conference {Dimitrios00anapproach,
	title = {An Approach to Designing and Implementing Virtual Museums},
	booktitle = {Proceedings of the seventh UK VR-SIG Conference},
	year = {2000},
	month = {9},
	abstract = {The current paper describes an approach to designing and implementing a virtual environment comprising ten different museums. The number of museums as well as the variety of their exhibits lead to the adoption of a generalised strategy that catered for all museum presentation needs and allowed for future expansion. Furthermore, the system architecture supports the delivery of multimedia content either over the Internet or via a local immersive virtual reality installation.},
	author = {D. Charitos and Giorgos Lepouras and Costas Vassilakis and Akrivi Katifori and C. Halatsis}
}
