Περιβάλλον-πλαίσιο εκτίμησης εμπιστοσύνης σε υπηρεσίες και σε πόρους υπηρεσιοκεντρικών συστημάτων

Τσιούνης, Κωνσταντίνος; Tsiounis, Konstantinos

dc.contributor.author	Τσιούνης, Κωνσταντίνος	el
dc.contributor.author	Tsiounis, Konstantinos	en
dc.date.accessioned	2018-06-21T08:56:01Z
dc.date.available	2018-06-21T08:56:01Z
dc.date.issued	2018-06-21
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/47108
dc.identifier.uri	http://dx.doi.org/10.26240/heal.ntua.15464
dc.rights	Αναφορά Δημιουργού-Μη Εμπορική Χρήση-Όχι Παράγωγα Έργα 3.0 Ελλάδα	*
dc.rights.uri	http://creativecommons.org/licenses/by-nc-nd/3.0/gr/	*
dc.subject	Δέντρα στόχων	el
dc.subject	Goal trees	el
dc.subject	Προτασιακή ικανοποιησιμότητα	el
dc.subject	Τεχνολογία λογισμικού	el
dc.subject	Ικανοποίηση απαιτήσεων	el
dc.subject	Εκτίμηση εμπιστοσύνης	el
dc.subject	Propositional satisfiability	en
dc.subject	Software engineering	en
dc.subject	Requirement satisfiability	en
dc.subject	Trust inference	en
dc.title	Περιβάλλον-πλαίσιο εκτίμησης εμπιστοσύνης σε υπηρεσίες και σε πόρους υπηρεσιοκεντρικών συστημάτων	el
heal.type	bachelorThesis
heal.classification	Μηχανική λογισμικού	el
heal.classificationURI	http://data.seab.gr/concepts/f23b5a8bb75e941c84fca2c0808368e5ac02a651
heal.language	el
heal.access	free
heal.recordProvider	ntua	el
heal.publicationDate	2018-06-14
heal.abstract	Το περιβάλλον-πλαίσιο που αναλύεται και αναπτύσσεται στην παρούσα διπλωματική επιτρέπει σε χρήστες να λαμβάνουν μια εκτίμηση της εμπιστοσύνης, που λαμβάνει μια υπηρεσία, ή ένας πόρος, που παρέχεται από συγκεκριμένο πάροχο για συγκεκριμένο περιεχόμενο. Συγκεκριμένα, ο χρήστης ορίζει τις απαιτήσεις μου έχει από την υπηρεσία και στην συνέχεια, αφού υπολογιστεί η πιθανοτική τιμή ικανοποίησης της κάθε απαίτησης, υπολογίζεται, λαμβάνοντας υπόψιν και τις αλληλεπιδράσεις, η τελική τιμή της εμπιστοσύνης.	el
heal.abstract	The main goal of this diploma thesis is the development of a framework that allows users to receive an assessment of the trust a service, provided by a single provider o n specific context, is entitled to. Given the increased frequency online services are used, the need for swift and efficient evaluation of their reliability increases respectively. The fram ework is designed to cover this need by assessing the extend to which a service in interest is trusted, keeping in mind the user’s preferences, regarding requi rements from the service on one hand, and external information, associated with each individual r equirement, and its level of satisfaction, on the other. For each and every requirement, that is used in the framework, a definition is required. The definition consists of external information, that have an impact on the requirement in question, as well as their respective correlations. The framework models the user’s needs and, subsequently, creates a goal tree, representing each requirement. Using logic inference techniques, relying heavily on Markov Logic Networks, an appreciation of a requirement ’ s sa tisfiability is calculated. Calculation can be performed with lack of information as well, which is an advantage of this method. A definition of the overall trust, and the requirements from which it consists of, is, moreover, required by the framework. A g raph corresponding to the given definition is constructed, based on certain criteria. The TidalTrust algorithm, which was initially proposed for social networks, is then applied upon this graph. The algorithm’s result value is provided to the user as an as sessment of the trust worthiness of the service, which is evaluated. Alterations on information and models can emerge later. The framework responds to these changes by discovering them, at first, and reinferring trust on a service, wherever it’s deemed nece ssary, afterwards. Similar behavior is portrayed when the time frame of information validity expires. This frame is supplied to the framework by the user , and is responsible for renewing the provided information , in specific time intervals. The framework’s architecture, which is defined and materialized, as part of this diploma thesis, is based on the Blackboard architectural pattern, as well as the Publisher/Subscriber architectural pattern. Such a choice enables the decoupling among the discrete stages of the trust inference process, and thus the possibility of executing the stages that are absolutely essential for the service assessment, given the alterations that have occurred at that certain point	en
heal.advisorName	Κοντογιάννης, Κωσταντίνος	el
heal.committeeMemberName	Σταφυλοπάτης, Ανδρέας-Γεώργιος	el
heal.committeeMemberName	Στάμου, Γεώργιος	el
heal.academicPublisher	Εθνικό Μετσόβιο Πολυτεχνείο. Σχολή Ηλεκτρολόγων Μηχανικών και Μηχανικών Υπολογιστών. Τομέας Τεχνολογίας Πληροφορικής και Υπολογιστών. Εργαστήριο Τεχνολογίας Λογισμικού	el
heal.academicPublisherID	ntua
heal.numberOfPages	102 σ.
heal.fullTextAvailability	true