Ubiquitous Web systems have to deal with varying context information in order to support context awareness. Accomplishing this requirement necessitates gathering, processing and representing that information, so that it can be used for adapting Web applications. In this paper we propose a mechanism for modeling dynamically changing context information like user’s device capabilities and locatio...

The purpose of this paper is to explore the similarities and differences and then argue for the potential synergies between two methodologies, namely Context-aware Reasoning and Case-based Reasoning, that are amongst the tools which can be used for intelligent environment (IE) system development. Through a case study supported by a review of the literature, we argue that context awareness and c...

A major challenge of Ambient Intelligence lies in building middleware that can ease service implementation through allowing the application developer to emphasize only the service logic. In this paper we describe the architecture of an Ambient Intelligence system established in the scope of the European research project CHIL (Computers in the Human Interaction Loop). CHIL aims at developing and...

This research is motivated by the need to design a biometric system that uses adaptive techniques relevant to a specific context to identify an individual with little or no interaction with the user. The aim of this research is to develop a framework for a context-aware adaptive multimodal biometric identification system using agent technology.

Location based services (LBS) are a specific instance of a broader class of Internet services that are predicted to become popular in a near future: context-aware services. The privacy concerns that LBS have raised are likely to become even more serious when several context data, other than location and time, are sent to service providers as part of an Internet request. This paper provides a cl...

Dynamic context aware systems need highly flexible privacy protection mechanisms. We describe an extension to an existing RBAC-based mechanism that utilises a dynamic measure of invasiveness to determine whether contextual information should be released.

One of the most important issues in an ambient intelligent environment, indeed in any problem-solving situation, is the ability of a system to appreciate its environment and assess the situation in which problems are to be solved. Recently, case-based reasoning has gained some momentum in the area of context awareness for ambient intelligent systems. When applying case-based reasoning in this t...

In several industry scenarios, it is often the case that an existing reference workflow has to be adapted according to specific context factors, which might even change at runtime. The adapted workflow instances virtually constitute process variants. In order to keep the efforts for systematic variant configuration and maintenance on a manageable level, recent work has proposed the use of conte...

Today, the syntax of visual specification languages such as UML is typically defined using meta-modelling techniques. However, this kind of syntax definition has drawbacks. In particular, graphic meta-models are not powerful enough, so they must be augmented by a textual constraint language. As an alternative, we present in this paper, a text-based technique for the syntax definition of a graph...