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PUBLICATIONS

2013

In this paper, we propose the problem of implementing an efficient query processing system for incomplete temporal and geospatial information in RDFi as a challenge to the SSTD community. For the…
We extend RDF with the ability to represent property values that exist, but are unknown or partially known, using constraints. Following ideas from the incomplete information literature, we develop…
The Optique European project aims at providing an end-to-end solution for scalable access to Big Data integration, where end users will formulate queries based on a familiar conceptualization of…
Linked geospatial data has recently received attention as researchers and practitioners have started tapping the wealth of geospatial information available on the Web. With the rapid population of…
In this paper we present the EU Optique project that aims at developing an end-to-end OBDA system for managing Big Data in industries.We discuss limitations of state of the art OBDA systems and…
In large companies such as Siemens and Statoil monitoring tasks are of great importance, e.g., Siemens does monitoring of turbines and Statoil of oil behaviour in wells. This tasks bring up…
We introduce the temporal component of the stRDF data model and the stSPARQL query language, which have been recently proposed for the representation and querying of linked geospatial data that…
We present a real-time wild re monitoring service that exploits satellite images and linked geospatial data to detect hotspots and monitor the evolution of re fronts. The service makes heavy use…
In this paper, we tackle the challenge of linking scholarly information in multi-disciplinary research infrastructures. There is a trend towards linking publications with research data and other…
In this paper we present the design of handheld Augmented Reality (AR) experiences that are seamlessly incorporated into interactive museum narratives, specifically for the Acropolis Museum. The…
A method for supervised classification and visualization of collections of scientific publications is presented. By integrating a text classification module, which leads to class probability…
Sets of "personas" representing archetypical visitors of two very different museums, the Acropolis Museum in Greece and Cité de l'espace in France, were defined and described as part of a multitude…
Microblogging platforms, such as Twitter, Tumblr etc., have been established as key components in the contemporary Web ecosystem. Users constantly post snippets of information regarding their…
The CHESS project has been working with Cité de l’Espace, a space technology centre, to explore the use of tablets and mobile phones to deliver visitor experiences that integrate across multiple…
In this paper, we study the problem of distributed RDFS reasoning over structured overlay networks. Distributed RDFS reasoning is essential for providing the functionality that Semantic Web and…
 Storytelling has recently become a popular way to guide museum visitors, replacing traditional exhibit-centric descriptions by story-centric cohesive narrations with references to the…
OpenAIRE is the European Union initiative for an Open Access Infrastructure for Research in support of open scholarly communication and access to the research output of European funded projects and…

2012

We present Strabon, a new RDF store that supports the state of the art semantic geospatial query languages stSPARQL and GeoSPARQL. To illustrate the expressive power o ered by these query languages…
Linked geospatial data has recently received attention, as researchers and practitioners have started tapping the wealth of geospatial information available on the Web. Incomplete geospatial…
We consider chordal RCC-8 networks and show that we can check their consistency by enforcing partial path consistency with weak composition. We prove this by using the fact that RCC-8 networks…
TELEIOS is a recent European project that addresses the need for scalable access to petabytes of Earth Observation data and the discovery of knowledge that is hidden in them. TELEIOS builds on…
TELEIOS is a recent European project that addresses the need for scalable access to petabytes of Earth Observation data and the discovery of knowledge that can be used in applications. To achieve…
Advances in remote sensing technologies have allowed us to send an ever-increasing number of satellites in orbit around Earth. As a result, satellite image archives have been constantly increasing…
This paper presents Logos, a system that provides natural language translations for relational queries expressed in SQL. Our translation mechanism is based on a graph-based approach to the query…
The aim of this paper is to present the state-of-the art research project in digital storytelling for museums titled CHESS (Cultural Heritage Experiences through Socio-personal interactions and…
AITION is a scalable, user-friendly, and interactive data mining (DM) platform, designed for analyzing large heterogeneous datasets. Implementing state-of-the-art machine learning…
A constantly growing amount of high-quality information is stored in pages coming from the Hidden Web. Such pages are accessible only through a query interface that a Hidden-Web site provides and…
Recent research on the use of mobile technologies, social networking, interactive digital storytelling, and augmented reality, amongst others, promises to make cultural heritage sites more…
Storytelling is a new way to guide museum visitors, where the traditional set of exhibit-centric descriptions is replaced by story-centric cohesive narrations with carfully-designed references to…

2011

In a server system having a predetermined total bandwidth providing data files to a plurality of clients in response to requests received from the clients, a method for providing admission control…
AITION is a scalable, user-friendly, and interactive data mining (DM) platform, designed for analyzing large heterogeneous datasets. Implementing state-of-the-art machine learning algorithms, it…
Scheduling data processing workflows (dataflows) on the cloud is a very complex and challenging task. It is essentially an optimization problem, very similar to query optimization, that is…
In this paper, we present a Knowledge Based System for describing and storing dances that takes advantage of the expressivity of Description Logics. We propose exploiting the tools of the Semantic…
Infrastructure-as-a-Service (IaaS) cloud providers often combine different hardware components in an attempt to form a single infrastructure. This single infrastructure hides any underlying…
Contemporary multimedia, scientific and medical applications use indexing structures to access their high-dimensional data. Yet, in sufficiently high-dimensional spaces, conventional tree-based access…
PAROS is a generic system under design whose goal is to offer personalization, recommendation, and other adaptation services to information providing systems. In its heart lies a rich user model…
Modern frameworks, such as Hadoop, combined with abundance of computing resources from the cloud, offer a significant opportunity to address long standing challenges in distributed processing.…
In this thesis, we propose a novel method for opinion mining and summarization of online web forum discussions that contain debates. We create summaries of the discussions by extracting a small…

2010

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…
In this demonstration, we present a flexible system that enables the provision of personalized functionalities to digital libraries. The system has been developed based on the needs of The European…
Digital Library (DL) interoperability requires addressing a variety of issues associated with functionality. We report on the analysis and solutions identified by the Functionality Working Group of…
The constant interaction of users with different Digital Libraries (DLs) and the subsequent scattering of user information across them raise the need not only for Digital Library interoperability…
Many XML filtering systems have emerged in recent years identifying XML data that structurally match XPath queries in an efficient way. However, apart from structural matching, it is considered…