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A Software Infrastructure for User-Guided Quality-of-Service Tradeoffs

João Sousa, Rajesh Krishna Balan, Vahe Poladian, David Garlan and Mahadev Satyanarayanan.

In J. Cordeiro editor, Software and Data Technologies, Vol. 47:48-61 of CCIS, Springer, 2009.

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This paper presents a framework for engineering resource-adaptive software targeted at small mobile devices. Rather than building a solution from scratch, we extend and integrate existing work on software infrastructures for ubiquitous computing, and on resource-adaptive applications. This paper addresses two research questions: first, is it feasibility to coordinate resource allocation and adaptation policies among several applications in a way that is both effective and efficient. And second, can end-users understand and control such adaptive behaviors dynamically, depending on user-defined goals for each activity. The evaluation covered both the systems and the usability perspectives, the latter by means of a user study. The contributions of this work are: first, a set of design guidelines, including APIs for integrating new applications; second, a concrete infrastructure that implements the guidelines. And third, a way to model quality of service tradeoffs based on utility theory, which our research indicates end-users with diverse backgrounds are able to leverage for guiding the adaptive behaviors towards activity-specific quality goals.

Keywords: Activity-oriented Computing, Self-awareness & Adaptation, Software Architecture, Ubiquitous Computing, Usability.  
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