Marinos Kavouras

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In order to deal with semantic heterogeneity and achieve semantic interoperability between heterogeneous applications, it is necessary to formalize geographic knowledge. The present paper introduces a method to formalize and integrate different geographic categorizations. The method is based on the mathematical theory of Concept Lattices. These rich(More)
Numerous attempts have been made to generate semantic ‘‘mappings’’ between different ontologies, or create aligned/integrated ones. An essential step towards their success is the ability to compare the categories involved. This paper introduces a systematic methodology for comparing categories met in geographic ontologies. The methodology explores/extracts(More)
Various algorithms have been proposed for the determination of the optimum path(s) in line networks. Moving in space under constraints is a far more complex problem, where research has been relatively scarce. An example would be the determination of the shortest sea course between two harbors. This paper presents a graph-based approach to the problem of the(More)
This paper proposes a methodology for the fusion of different geographic domain ontologies with toplevel ontologies, in order to provide a solid base for information exchange. The proposed methodology discusses context formation and the formalization of geographic concepts using essential properties.
Fish stress may result in inhibition of reproduction, development and growth. Thus, appropriate indices should be developed to accurately define the physiological plasticity of fish, in terms of coping with stress. Sea bream individuals were subjected to physical stress (fasting and confinement). DNA fragmentation of liver cells was assessed, in addition to(More)
A crucial issue during semantic integration of different geographic metadata sources is category comparison and reconciliation. We focus on the development of a framework for identification and resolution of semantic heterogeneity between geographic categories. The framework is divided in three processes: extraction, comparison and reconciliation. The first(More)
Geographic concept definitions are a rich source of knowledge with special structure and content. Conceptual Graphs are a visual, advanced knowledge based representation formalism grounded on philosophical, linguistic and object-oriented principles (Sowa, 1984 & 2000). We introduce a straightforward and easy-to-implement methodology for the representation(More)