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NOTICE: This publication has been reviewed according to procedures approved by a National Academy of Engineering report review process. Publication of signed work signifies that it is judged a competent and useful contribution worthy of public consideration, but it does not imply endorsement of conclusions or recommendations by the NAE. The interpretations and conclusions in such publications are those of the authors and do not purport to represent the views of the council, officers, or staff of the National Academy of Engineering.

Funding for the activity that led to this publication was provided by DuPont, The Grainger Foundation, Microsoft Research, Defense Advanced Research Projects Agency, Air Force Office of Scientific Research, Department of Defense ASD(R&E)–Research Directorate-STEM Development Office, Cummins Inc., and the Greater Wilmington Convention and Visitors Bureau. This material is also based upon work supported by the National Science Foundation under Grant No.1305854. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation. In addition, the content of this publication does not necessarily reflect the position or the policy of the government, and no official endorsement should be inferred.

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