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Designing Energy and User Efficient Interactions with Mobile Systems Lu Luo CMU ISR 08 102 April 2008 School of Computer Science Institute for Software Research Carnegie Mellon University Pittsburgh PA 15213 Thesis Committee Daniel P Siewiorek Chair Bonnie E John Priya Narasimhan Diana Marculescu Department of Electrical and Computer Engineering Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy Copyright 2008 Lu Luo This research was sponsored by the Defense Advanced Project Agency DARPA under Contract No NBCHD030010 the National Science Foundation NSF under Grant Nos EEEC 540865 and 0205266 the Office of Naval Research ONR N00014 03 1 0086 and HP Labs The views and conclusions contained in this document are those of the author and should not be interpreted as representing the official policies or endorsements either express or implied of DARPA the NSF ONR HP Labs Carnegie Mellon University the U S Government or any other entity Keywords Mobile computing energy efficiency user interaction user interface design cognitive modeling ubiquitous computing Abstract Mobile computing has thrived to provide unprecedented user experiences beyond the boundary of desks and wires The increasing demand for mobility faces two major challenges reduced form factor and limited energy supply Although each challenge has been addressed by significant research efforts the correlation between them is underexplored Energy efficiency should be integrated as an important metric of user interaction design in mobile systems By carefully considering the specific requirements of the user and the context of usage energy efficiency can be achieved without sacrificing user performance and satisfaction and interaction design that facilitates user efficiency can also promote energy efficiency This dissertation starts with a detailed study of typical workload and screen usage that shows that users seldom use the entire screen on most workloads Hence Dark

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