The Semantic Web: Research and Applications

Abstract

Abstract. Annotea provides an annotation protocol to support collaborative Semantic Web-based annotation of digital resources accessible through the Web. It provides a model whereby a user may attach supplementary information to a resource or part of a resource in the form of: either a simple textual comment; a hyperlink to another web page; a local file; or a semantic tag extracted from a formal ontology and controlled vocabulary. Hence, annotations can be used to attach subjective notes, comments, rankings, queries or tags to enable semantic reasoning across web resources. More recently tabbed Browsers and specific annotation tools, allow users to view several resources (e.g., images, video, audio, text, HTML, PDF) simultaneously in order to carry out side-by-side comparisons. In such scenarios, users frequently want to be able to create and annotate a link or relationship between two or more objects or between segments within those objects. For example, a user might want to create a link between a scene in an original film and the corresponding scene in a remake and attach an annotation to that link. Based on past experiences gained from implementing Annotea within different communities in order to enable knowledge capture, this paper describes and compares alternative ways in which the Annotea Schema may be extended for the purpose of annotating links between multiple resources (or segments of resources). It concludes by identifying and recommending an optimum approach which will enhance the power, flexibility and applicability of Annotea in many domains.

Ontology evolution for personalised and adaptive activity recognition

“…Ontology evolution phases and their issues have been described by the different researchers such as capturing change requirements described by [14,15], change detection and version logging described by [16], formal change specification described by [12], change implementation and consistency maintenance described by [13].…”

Αξιοποίηση Συστημάτων Συστάσεων Στο Μαθησιακό Σχεδιασμό

“…Στα ΣΚΕ, τα οποία τα τελευταία χρόνια γίνονται όλο και πιο δημοφιλή, οι χρήστες δημιουργούν ή «ανεβάζουν» περιεχόμενο (items), το επισημαίνουν με λέξεις δικής τους ελεύθερης επιλογής (tags), και το διαμοιράζονται με άλλους χρήστες. Το σύνολο των ετικετών που δημιουργούνται είναι γνωστό ως folksonomy (Specia, Motta, Franconi, Kifer, & May, 2007). Έτσι, μια νέα πρόταση για τα ΣΣ είναι ο εμπλουτισμός της περιγραφής των αντικειμένων με αξιοποίηση των ετικετών που παράγονται στο πλαίσιο των ΣΚΕ (de Gemmis, Lops, Semeraro, Basile, & Degemmis, 2008), (Milicevic, Nanopoulos, & Ivanovic, 2010).…”

Ontology Evolution

“…However, in addition to ontology model richness, integration, and reuse of existing ontologies make ontology evolution more complex, especially in a distributed context. − Capturing ontology change requirements can be guided by users' requirements (Völker, Vrandecic, & Sure, 2005;Völker, Vrandecic, Sure, & Hotho, 2007a;Völker, Hitzler, & Cimiano, 2007b). − Corrective maintenance focuses on inappropriate behavior of KBS and aims to resolve errors (syntactic, semantic, or knowledge identification errors).…”

“…• Conceptual preciseness based on Learning Disjointness Axioms (LeDA) (Völker et al 2007a) and Learning Expressive Ontologies (LExO) (Völker et al, 2007b) in OWL DL language.…”