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Linked Open Data

Planet Data - Wed, 08/13/2014 - 22:44
Authors: Giorgos FlourisYear: 2014Presentation Date: Saturday, 17 May, 2014Presented at: Hack4MED event

More information about the event could be found here

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How the Use of Open Data can Benefit the Tourism Industry

Planet Data - Wed, 08/13/2014 - 22:39
Authors: Irini FundulakiYear: 2014Presentation Date: Wednesday, 12 February, 2014Presented at: DANTE project's "study visits"

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Defeasibility in contextual reasoning with CKR

Planet Data - Wed, 08/13/2014 - 22:32
Year: 2014Publication Date: Tuesday, 17 June, 2014Published in: CILC14Authors: L.Bozzato, T.Eiter, L.Serafini


Recently, representation of context dependent knowledge in the Semantic Web has been recognized as a relevant issue and a number of logic based solutions have been proposed in this regard: among them, in our previous works we presented the Contextualized Knowledge Repository (CKR) framework. A CKR knowledge base has a two layered structure, modelled by a global context and a set of local contexts: the global context not only contains the metaknowledge defining the properties of local contexts, but also holds the global (context independent) object knowledge that is shared by all of the local contexts. In many practical cases, however, it is desirable to leave the possibility to “override” the global object knowledge at the local level, by recognizing the axioms that can allow exceptional instances in the local contexts. This clearly requires to add a
notion of non monotonicity across the global and the local parts of a CKR. In this paper we present an extension to the semantics of CKR to introduce such notion of defeasible axioms. By extending a previously proposed datalog translation, we obtain a representation for CKR as a datalog program with negation under answer set semantics. This representation can be exploited as the basis for implementation of query answering for the proposed extension of CKR.

AttachmentSize CILC14-BozEitSer14.pdf467.32 KB
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Contextualized Knowledge Repositories with Justifiable Exceptions

Planet Data - Wed, 08/13/2014 - 22:29
Year: 2014Publication Date: Thursday, 17 July, 2014Published in: DL2014Authors: Loris Bozzato, Thomas Eiter, and Luciano SerafiniAbstract: 

Representation of context dependent knowledge in the Semantic Web has been recognized as a relevant issue: as a consequence, a number of logic based formalisms have been proposed in this regard. In response to this need, in previous works, we presented the description logic-based Contextualized Knowledge Repository (CKR) framework. Starting from this point, the first contribution of the paper is an extension of CKR with the possibility to represent defaults in context dependent axioms and a translation of extended CKRs to datalog programs with negation under answer sets semantics. The translation generates datalog programs which are sound and complete w.r.t. instance checking in CKRs. Exploiting this result, we have developed as a second contribution a prototype implementation that compiles a CKR based on OWL2RL to a datalog program. Finally, we compare our approach with major non-monotonic formalisms for description logics and contextual knowledge representation.

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Linked Open Data - Introduction to the Special Theme

Planet Data - Wed, 08/13/2014 - 22:22
Year: 2014Publication Date: Wednesday, 15 January, 2014Published in: ERCIM News 2014(96) (2014)Authors: Irini Fundulaki, Sören Auer


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Securing Access to Sensitive RDF Data

Planet Data - Wed, 08/13/2014 - 21:50
Year: 2014Publication Date: Wednesday, 28 May, 2014Published in: European Semantic Web Conference 2014 (ESWC2014)Authors: V. Papakonstantinou, G. Flouris, I. Fundulaki, and H. Kondylakis.Abstract: 

Given the increasing amount of sensitive RDF data available on theWeb, it becomes critical to guarantee secure access to this content. The problem becomes even more challenging in the presence of RDFS inference, where inferred knowledge needs to be protected in the same way as explicit one. State of the art models for RDF access control annotate triples with concrete values that denote whether a triple can be accessed or not. In such approaches, the computation of the corresponding values
for the inferred triples is hard-coded; this creates several problems in the presence of updates in the data, or, most importantly, when the access control policies change. We answer the above challenges by proposing an abstract model where the access labels are abstract tokens, and the computation of inferred labels is modelled through abstract operators. We demonstrate our model through the HACEA (Health Access Control Enforcement Application) that provides simple access control/privacy functionalities in the context of a medical use case.

AttachmentSize eswc2014pd_submission_14.pdf456.68 KB Poster_Flouris.pdf284.8 KB
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PlanetData: A European Network of Excellence on Large-Scale Data Management

Planet Data - Wed, 08/13/2014 - 21:44
Authors: Irini FundulakiYear: 2014Presentation Date: Wednesday, 28 May, 2014Presented at: European Semantic Web Conference 2014 (ESWC2014)

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Very Large Data Bases 2014 (VLDB2014)

Planet Data - Fri, 06/13/2014 - 14:39
Start date: Monday, 1 September, 2014End date: Friday, 5 September, 2014Place-Venue: 

Hangzhou, China

VLDB is a premier annual international forum for data management and database researchers, vendors, practitioners, application developers, and users. The conference will feature research talks, tutorials, demonstrations, and workshops. It will cover current issues in data management, database and information systems research. Data management and databases remain among the main technological cornerstones of emerging applications of the twenty-first century.


VLDB2014 will take place atHangzhou, which is one of the best tourism cities in China. Hangzhou is also one of the eight ancient capitals in Chinese history and one in the first group of National Famous Historical and Cultural Cities. The West Lake in Hangzhou, known as the "earthly paradise", is one of the top attractions in China and abroad. Besides, Hangzhou is the hometown of tea and silk. Longjing Green Tea is the No. 1 among the top ten Chinese teas. attracts many tourists every year, and offers numerous opportunities for sightseeing (e.g., West Lake, Lingyin Temple, Qiantang River), outdoor activities (e.g., hiking, cycling, boating), cluture tasting (e.g., tea, silk, traditional cuisine, Grand Canal ), as well as fun (e.g., Songcheng Theme Park, "Impression of West Lake" light opera).


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2nd International workshop on Benchmarking RDF Systems (BeRSys 2014)

Planet Data - Fri, 06/13/2014 - 14:34
Start date: Friday, 5 September, 2014End date: Friday, 5 September, 2014Place-Venue: 

co-located with VLDB 2014

Following the 1st International workshop on Benchmarking RDF Systems (BeRSys 2013) the aim of the BeRSys 2014 workshop is to provide a discussion forum where researchers and industrials can meet to discuss topics related to the performance of RDF systems. BeRSys 2014 is the only workshop dedicated to benchmarking different aspects of RDF engines - in the line of TPCTC series of workshops.The focus of the workshop is to expose and initiate discussions on best practices, different application needs and scenarios related to different aspects of RDF data management. 

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Usage of Internet technologies by touristic service providers

Planet Data - Wed, 06/11/2014 - 10:19
Authors: Dieter FenselYear: 2014Presentation Date: Tuesday, 10 June, 2014Presented at: FORTH

Communicating straight with customers, in an efficient and effective manner is still a desideratum for small, medium and large companies alike. With the rapid development of ICT technologies, including Internet, Web-based communication, and recently Social Media, the number of possibilities to interact directly with customers has grown event larger. For small and medium companies in general and those in the touristic industry in particular, direct communication with customers has been always seen as an enabler for massive direct sales. However, these expectations are still to be fulfilled. In this talk we analyze the causes of this failure and propose a solution on how effective and efficient communication for touristic industry should be realized. We perform an empirical analysis of the usage pattern of Internet technology in the touristic domain. We introduce first the challenges faced nowadays by touristic service providers in terms of online and mobile booking, commission payments and social media. We then have a look at key technologies and communication channels that touristic service providers must use in order to be highly visible online including static, dynamic, sharing, collaboration, social media, fora, vocabularies, semantic formats, etc. We analyze the uptake of these technologies and channels by hotels, hotels chains, destinations and booking channels and point out on one hand how well intermediaries i.e. booking channels (e.g.,, etc.) are using them, while on the other hand, touristic service providers are failing. Finally, we show how these technologies and communication channels should be used for effective direct marketing in the touristic industry by means of a real pilot developed in collaboration with the touristic association of service providers located in the city of Innsbruck and its surroundings i.e. Tourismusverband Innsbruck (TVb).

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EXPERIMEDIA @ The Future Internet Assembly, 8-10th May

Experimedia - Wed, 04/17/2013 - 16:21
The EXPERIMEDIA project will be at the Future Internet Assembly in Dublin, May 8-10th. We have a large booth in the Hands on FIRE exhibition shared with the related projects 3D-LIVE and STEER. We are also running a session on Linking user populations to novel networks in Future Internet research programmes on Thursday. With our second Open Call coming up it is a great opportunity to come and talk to us about getting your ideas funded.MEDIAConnect Demonstration The MEDIAConnect experiment is finding out whether people find Augmented Reality displays useful for accessing information. MEDIAConnect is deployed in Schladming, the Austrian ski resort that recently hosted the FIS World Ski Championship 2013. The experiment is investigating the Quality of Experience for tourists using a mobile augmented reality application. By pointing their tablet or phone at large panorama posters of the ski slopes located at the ski lifts they can view additional dynamic content such as weather conditions, ski lift states (open or closed) and photos of points of interest. This application aims to allow skiers to better plan their day of skiing and spot new areas of interest whilst at the ski station. See for yourself: come and try MEDIAConnect at our stand. Weightlifting Demonstration Become a Future Internet Athlete!  Can you lift the weights better than an Olympian?When lifting our (very light) weights you will be tracked in 3D and given a score for the leader board which is then Tweeted for your friends to enjoy. Meanwhile the score, Quality of Service data from the 3D tracking, your emotional feedback and analysis of social network activity is all fed into the Experiment Content Component database to help an experimenter understand the usage and impact of the system. This is a fun extension of an experiment being undertaken at CAR, the high-performance athletics training facility in Barcelona. Instant feedback is provided to the athletes and coach regarding the speed, position and balance of a lift and we may also investigate the pros and cons of sharing training performance data online with an athlete’s social circle. Come and see if you are the best and learn about experimentation in EXPERIMEDIA.Linking user populations to novel networks in Future Internet research programmes As one of the FIA working sessions on Thursday, we will be leading a discussion on how we can engage users in Future Internet research and experimentation. Using case studies from EXPERIMEDIA, STEER, 3D-LIVE and FI-CONTENT we will explore the following questions: What approaches exist and what is applicable in what situation? How does user participation change at different phases of the RTD lifecycle? How can we scale user participation from trials to industrialization and what does this mean for qualitative and quantitative assessment? How is user participation being addressed in the FIRE and FI-PPP programmes and what can be done to improve it?
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Future Internet Research in Europe

Future Internet Austria - Thu, 03/03/2011 - 14:43

The ceFIMS database is the central repository for information on Future Internet research and activities taking place in Europe

You will find this quite useful instrument here at:

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