A Semantic Web Approach for Adaptive Hypermedia

2010

The research area of adaptive hypermedia originates from the coming together of the areas of hypertext and hypermedia, user modeling and Web-based information systems, all of which have embraced the topic of adaptation.

Adaptive Hypermedia and Adaptive Web- …, 2006

Adaptive Hypermedia is utilised in several domains, such as eLearning and professional training, where there is a growing movement towards the use of cognitively richer and more 'active' approaches to user engagement. In order to support this move, it is vital that adaptive personalisation systems, in these domains, are capable of integrating adaptively composed activities into adaptively personalised content compositions . Through the integration of the approaches that are used in the automated composition of web services with those found in Adaptive Hypermedia, we believe that it will be possible to support a unified approach to the adaptation of content and services through the leveraging of the characteristics that are common to both adaptive application domains.

2001

This paper presents an XML-based flexible and modular architecture for the modelling and the run-time support of web-based Adaptive Hypermedia Systems supporting multi-channel access. The proposed XML Adaptive Hypermedia Model (XAHM) and the supporting architecture allow the hypermedia adaptation along three different "adaptivity dimensions": user`s behaviour; technology, external environment. A view over the Application Domain corresponds to each possible position of the user in the "adaptation space". The user's behaviour is modelled using a probabilistic approach that dynamically constructs a discrete probability density function. Using that distribution the system attempts to assign the user to the "best" profile that fits his/her expectations. Moreover, the delivered presentation units are composed, formatted and presented according to network and terminal constraints, and external environment conditions.

2003

The predominant approach taken by the adaptive hypermedia (AH) community to implementing AH systems may be characterised as application-orientated and technologydriven. This has, in part, resulted in relatively low levels of interchangeability and interoperability between AH systems. To address this situation recent AH research has begun to focus on understanding the mechanisms and structures underpinning AH systems. In particular, several formal models have been proposed which address these issues, the prominent examples being Adaptive Hypermedia Application Model, the Fundamental Open Hypermedia Model and the Goldsmiths Adaptive Hypermedia Model. In this paper we propose a component-based architecture for AH within which these approaches to modelling are compared and understood. Using this architecture we show that although each model uses different representations there are important underlying commonalities. It is envisaged that through an understanding of these commonalities, it may be possible for the AH community to devise a standardised "plug 'n' play" architecture for the development of future AH systems.

Lecture Notes in Computer Science, 2006

2002

Web Information Systems (WIS) present up-to-date information on the Web based on data coming from heterogeneous sources. In previous work the Hera methodology was developed to support the design of a WIS. In this paper we target the design of an intelligent WIS. For this reason the Hera methodology is extended with two kinds of hypermedia presentation adaptation: adaptability based on a profile storing device capabilities and user preferences, and adaptivity based on a user model storing the user browsing history. While adaptability is considered to be static, i.e. the presentation is fixed before the browsing starts, adaptivity is dynamic, i.e. the presentation changes while the user is browsing it. The models used in Hera and their adaptation aspects are specified in RDF(S), a flexible Web metadata language designed to support the Semantic Web.

shared ontologies and reasoning strategies (generated by the framework and semantically represented), which can be accessed and re-used by other applications. This paper proposes a semantic framework built on multidimensional ontological planes for the design of adaptive systems. The core of the framework is composed by three matrices whose different planes contain the ontological representation of different types of knowledge. On these planes we represent user features, her actions, context, device, content domain, adaptation goals and methods. The join between planes allows us to represent semantic rules for inferring new user features and to define adaptation strategies. We exploit OWL (Ontology Web Language) to represent taxonomic knowledge and SWRL (Semantic Web Rule Language) for rules. The framework presents a new approach to build adaptive hypermedia systems that support interoperability. In particular the framework manages two types of adaptation knowledge: i)knowledge regarding which features of the system have to be adapted and which dimensions (user, context, device, etc.) have to be taken into account to perform adaptation; ii)knowledge regarding adaptation strategies and rules for relating user features to other user features, extending the user model and inferring new knowledge from the available one. We represent (i) the declarative descriptions of adaptve system dimensions with ontologies expressed in a standard semantic markup language for the Semantic Web, OWL 1 , and (ii) the inference rules with SWRL 2 , a proposal for a semantic rule language.

2011

Abstract. The heterogeneity problem (in terms of different types of access devices, bandwidth of the network, preferences/characteristics of the user, etc.) has become one of the major problems to be solved on the Internet. Different alternatives have been developed in order to allow universal access to any type of content, and the Adaptive Hypermedia Systems (AHS) have emerged as a solution for this. At the same time there is a growing interest in Multiagent Systems (MAS), which have become one of the most powerful software engineering approaches to develop applications in multiple and complex domains. Taking into account this problem, we present a design proposal for a MAS for an AHS applying the well-known GAIA methodology. Furthermore, in order to complement the conceptual definition we graphically represent the proposed MAS using Agent UML (AUML) notation. Keywords. Multiagent Systems, Adaptive Hypermedia Systems.

Second International Workshop on Web Dynamics, 2002

Abstract. This work presents an Application Domain model for Adaptive Hypermedia Systems and an architecture for its support. For the description of the high-level structure of the application domain we propose an object-oriented model based on the class diagrams of the Unified Modeling Language, extended with (i) a graph-based formalism for capturing navigational properties of the hypermedia and (ii) a logic-based formalism for expressing further semantic properties of the domain. The model makes use of XML for the ...