Εργαστήριο Διανεμημένων Πληροφοριακών Συστημάτων και Εφαρμογών

Μόνιμο URI για αυτήν την κοινότηταhttps://dspace.library.tuc.gr/handle/123456789/103

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Πλοήγηση Εργαστήριο Διανεμημένων Πληροφοριακών Συστημάτων και Εφαρμογών ανά Συγγραφέα "Lagoudakis Michael"

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    Design and implementation of a platform for the development and management of learning experiences in location-based mobile games
    (Πολυτεχνείο Κρήτης, 2015) Makris Dimitrios-Ioannis; Μακρης Δημητριος-Ιωαννης; Christodoulakis Stavros; Χριστοδουλακης Σταυρος; Deligiannakis Antonios; Δεληγιαννακης Αντωνιος; Lagoudakis Michael; Λαγουδακης Μιχαηλ
    Recent international surveys present that educational games can be used to promote critical thinking and enhance problem solving skills even in the early school ages. On the other hand, it is a common belief that due to the rapidly changing technology, education should be adapted in order to follow the changes and the new needs of students. To this end, any tool supporting the creation of educational learning experiences, through the use of modern devices and technologies, is considered invaluable both for educators and young learners. In this thesis we discuss the design and implementation of a platform for the development and management of learning experiences in location-based games. More specifically, we present an authoring tool (desktop application) supporting the creation and management of mobile location-based games, as well as scenario editing, user interface customization and organization of gaming activities. Furthermore, we present the player application (mobile application) that we have developed, supporting the play of games which have been created using the authoring tool. The player application is compatible with most state-of-the-art mobile devices and platforms, while both tools have been designed with flexibility and extensibility in mind. To this end, they can be used in various domains including education, museum exploration, city sightseeing, as well as in everyday gaming activities for having fun. Our applications are compatible with well known modern educational tools and repositories through the direct use of the Tin Can API. Finally, is worth mentioning that they have been evaluated for their usability by professionals and naive users.
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    The SPARQL-RW framework: mapping modeling and query rewriting for ontology based mediators
    (Πολυτεχνείο Κρήτης, 2014) Makris Konstantinos; Μακρης Κωνσταντινος; Christodoulakis Stavros; Χριστοδουλακης Σταυρος; Deligiannakis Antonios; Δεληγιαννακης Αντωνιος; Lagoudakis Michael; Λαγουδακης Μιχαηλ
    The Web of Data is an open environment consisting of heterogeneous, distributed and highly structured information sources. Uniform information access in this kind of setting is of major importance for data consumer applications and end users. To this end, ontology based mediator systems supporting transparent query access over federated data sources are considered essential. In this thesis we present SPARQL-RW, a Framework supporting mapping modeling and query rewriting in the context of ontology based mediator architectures. SPARQL-RW provides a formal model for describing mappings between ontology schemas, as well as a generic method for SPARQL 1.1 query rewriting, with respect to a set of predefined ontology mappings and data source endpoints. The mapping model supports a set of rich and flexible mapping types based on Description Logic semantics, as well as notable mapping formalisms, including Global-As-View (GAV), Local-As-View (LAV), and Global-and-Local-As-View (GLAV). Additionally, it defines a mapping language capable of representing all the supported types of inter-schema correspondences. The Framework provides functionality for performing mapping inference and for identifying inconsistencies in a given set of mappings and ontology schemas. Regarding query rewriting, the proposed algorithms are proved to provide semantics preserving queries with respect to the GAV mapping types supported by the model. The reformulated queries can be executed directly on any SPARQL federated query engine, or exploited as logical query plans by any ontology based mediator system. SPARQL-RW has been implemented, formally evaluated and tested in a prototype mediator system integrating several data providers from the biodiversity community along with DBpedia.