Much research on context quality in context-aware systems divides into two strands: (1) the qualitative identi cation of quality measures and (2) the use of uncertain reasoning techniques. In this paper, we combine these two strands, exploring the problem of how to identify and propagate quality through the di erent context layers in order to support the context reasoning process. We present a ...

We propose heading-aware methods of generating search result snippets of web pages. A heading is a brief description of the topic of its associated sentences. Some existing methods give priority to sentences containing many words that also appear in headings when selecting sentences to be included in snippets with limited length. However, according to our observation, words in heading are very ...

Phenomena in the performance behaviour of high-performance computing (HPC) applications can stem from the HPC system itself, from the application’s code, but also from the simulation domain. In order to analyse the latter phenomena, we propose a system that visualizes profile-based performance data in its spatial context, i.e., on the geometry, in the simulation domain. It thus helps HPC expert...

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Interrupting users engaged in tasks typically has negative effects on their task completion time, error rate, and affective state. Empirical research has shown that these negative effects can be mitigated by deferring interruptions until more opportune moments in a user’s task sequence. However, existing systems that reason about when to interrupt do not have access to models of user tasks that...

mobile ad hoc networks (manets) are composed of mobile stations communicating through wireless links, without any fixed backbone support. in these networks, limited power energy supply, and frequent topology changes caused by node mobility, makes their routing a challenging problem. tora is one of the routing protocols that successfully copes with the nodes’ mobility side effects, but it doesn’...

Exploiting context-aware environments, where sensors scattered in a environment update presence servers to indicate the environmental changes can be used to enable new services. Such systems have become feasible both in terms of technical difficulties and their cost. A current focus in this area of research is how a context-aware system should be designed so that it reduces both the cost and co...

This issue of JAISE is focused on the theme of Context Awareness. This topic is a key concept in the development of many Ambient Intelligence systems and as such we expect this issue to be well received by the community at large. While the topic of context-aware design has been on the technical agenda of many research groups for more than a decade, there are still several outstanding challenges...

Context awareness offers a powerful vision that aims to build novel services that adapt to the situation of the user. Context-aware frameworks provide functionalities for gathering data from sensors and for processing this data to interpret the user’s context. This context information is further used to adapt the behavior of services. Adaptation is often performed by applying predefined rules t...