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Auflistung nach Autor:in "Athanasiadis, Ioannis"

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  • Konferenzbeitrag
    Data Mining Air Quality Data for Athens, Greece
    (Managing Environmental Knowledge, 2006) Efraimidou, Melina; Kanaki, Maria; Athanasiadis, Ioannis; Mitkas, Pericles; Karatzas, Kostas
    Urban air quality management and information systems are required to include advanced capabilities of quick, effective and easy to operate environmental data analysis applications, for information extraction and analysis and for the support of decision making. These systems are based on the need of city authorities and national governments to establish a framework which enables them to take actions, in order to ensure that air quality is improved and relevant standards are maintained in urban areas. In this context, quantitative data-driven decision support models are challenged by the difficulties in handling dynamic and uncertain features of real-world environmental systems. In addition, conditions for environmental management keep changing with time, demanding periodically updated decision support. These properties can be realized by learning from environmental data, using knowledge discovery techniques. In the present paper, data mining techniques are applied for data analysis and for the construction of forecasting modules towards decision making, on the basis of selected air quality information for Athens, Greece. Conclusions are drawn concerning the performance of algorithms, and for the research to be conducted in the future.
  • Konferenzbeitrag
    Publishing Agro-Environmental Data to a Semantically Unified Environmental Information Space: a Case Study
    (Innovations in Sharing Environmental Observations and Information, 2011) Nesic, Sasa; Rizzoli, Andrea Emilio; Athanasiadis, Ioannis; Donatelli, Marcello
    Publishing environmental data to Linked Open Data (LOD) requires environmental data providers to adopt a set of universally recognized linked data principles. These principles enable syntactic integration of the linked data regardless of the data publisher and origin. However, these principles do not provide any mechanism for semantic integration and interoperability of the linked data. In order to turn the linked environmental data into a semantically unified environmental information space, the linked environmental data must be accompanied by conceptualized semantics defined in domain conceptualizations known as domain ontologies. Taking into account the linked data principles and domain ontologies we proposed a set of requirements and a data-publishing workflow for environmental data providers. In this paper we present a case study supporting our approach by delivering: 1) an agro-environmental domain ontology and 2) a supporting software system that realizes the proposed data-publishing workflow. We demonstrate the publishing workflow on publishing some example, agro-environmental resources provided by JRC MARS, which is one of the leading European institutions for monitoring agricultural resources founded by the European Commission.