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Des. Autom. Electron. Syst."],"published-print":{"date-parts":[[2014,11,18]]},"abstract":"<jats:p>Power efficiency is increasingly critical to battery-powered smartphones. Given that the using experience is most valued by the user, we propose that the power optimization should directly respect the user experience. We conduct a statistical sample survey and study the correlation among the user experience, system runtime activities, and computational performance of an application processor. We find that there exists a minimal frequency requirement, called \u201csaturated frequency\u201d. Above this frequency, the device consumes more power but provides little improvements in user experience. This study motivates an intelligent self-adaptive scheme, SmartCap, that automatically identifies the most power-efficient state of the application processor. Compared to prior Linux power adaptation schemes, SmartCap can help save power from 11% to 84%, depending on applications, with little decline in user experience.<\/jats:p>","DOI":"10.1145\/2651402","type":"journal-article","created":{"date-parts":[[2014,11,24]],"date-time":"2014-11-24T15:29:41Z","timestamp":1416842981000},"page":"1-16","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":4,"title":["SmartCap"],"prefix":"10.1145","volume":"20","author":[{"given":"Xueliang","family":"Li","sequence":"first","affiliation":[{"name":"Chinese Academy of Sciences, Beijing, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Guihai","family":"Yan","sequence":"additional","affiliation":[{"name":"Chinese Academy of Sciences, Beijing, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yinhe","family":"Han","sequence":"additional","affiliation":[{"name":"Chinese Academy of Sciences, Beijing, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xiaowei","family":"Li","sequence":"additional","affiliation":[{"name":"Chinese Academy of Sciences, Beijing, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"320","published-online":{"date-parts":[[2014,11,18]]},"reference":[{"key":"e_1_2_1_1_1","doi-asserted-by":"publisher","DOI":"10.1145\/1999995.2000002"},{"key":"e_1_2_1_2_1","doi-asserted-by":"publisher","DOI":"10.1145\/1814433.1814446"},{"key":"e_1_2_1_3_1","doi-asserted-by":"publisher","DOI":"10.1145\/1814433.1814453"},{"key":"e_1_2_1_4_1","doi-asserted-by":"publisher","DOI":"10.1109\/MM.2011.18"},{"key":"e_1_2_1_5_1","doi-asserted-by":"publisher","DOI":"10.1080\/01449290500330331"},{"key":"e_1_2_1_6_1","doi-asserted-by":"publisher","DOI":"10.1145\/1358628.1358693"},{"volume-title":"Proceedings of the Design, Automation, and Test in Europe Conference (DATE'13)","author":"Li X.","key":"e_1_2_1_7_1","unstructured":"X. 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