Using Implicit User Feedback to Balance Energy Consumption and User Comfort of Proximity-Controlled Computer Screens

P.A. Jaramillo Garcia, L.I. Lopera Gonzalez, O.D. Amft

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9 Citations (Scopus)
86 Downloads (Pure)

Abstract

This paper presents a dynamically adaptive proximity controller (APC) to balance energy consumption and user comfort of computer screens in office environments. Our APC system detects desk activities, such as working with the computer screen (screen on) and being away (screen off) and controls screens accordingly. Ultra-sound range (USR) sensors were used to measure user proximity. To compensate for USR measurement errors, APC timing parameters were dynamically adapted and previous screen switch-off operations corrected using implicit user feedback. The feedback was obtained from proximity variance increases due to user movement following erroneous control operations. System performance and user comfort were evaluated in a real-life intervention study with 12 participants during 19 days. Detection accuracy was up to 98 %. Energy savings of up to 21 % were obtained by comparing intervention and baseline measurements. User responses showed that the APC system could yield energy savings, while maintaining user comfort when assessed using pre- and post-intervention questionnaires. The implicit feedback control is suitable to reduce system commissioning effort.
Original languageEnglish
Pages (from-to)207-221
JournalJournal of Ambient Intelligence and Humanized Computing
Volume6
Issue number2
DOIs
Publication statusPublished - 2015

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Energy utilization
Feedback
Controllers
Energy conservation
Ultrasonics
Measurement errors
Feedback control
Switches
Sensors

Cite this

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title = "Using Implicit User Feedback to Balance Energy Consumption and User Comfort of Proximity-Controlled Computer Screens",
abstract = "This paper presents a dynamically adaptive proximity controller (APC) to balance energy consumption and user comfort of computer screens in office environments. Our APC system detects desk activities, such as working with the computer screen (screen on) and being away (screen off) and controls screens accordingly. Ultra-sound range (USR) sensors were used to measure user proximity. To compensate for USR measurement errors, APC timing parameters were dynamically adapted and previous screen switch-off operations corrected using implicit user feedback. The feedback was obtained from proximity variance increases due to user movement following erroneous control operations. System performance and user comfort were evaluated in a real-life intervention study with 12 participants during 19 days. Detection accuracy was up to 98 {\%}. Energy savings of up to 21 {\%} were obtained by comparing intervention and baseline measurements. User responses showed that the APC system could yield energy savings, while maintaining user comfort when assessed using pre- and post-intervention questionnaires. The implicit feedback control is suitable to reduce system commissioning effort.",
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Using Implicit User Feedback to Balance Energy Consumption and User Comfort of Proximity-Controlled Computer Screens. / Jaramillo Garcia, P.A.; Lopera Gonzalez, L.I.; Amft, O.D.

In: Journal of Ambient Intelligence and Humanized Computing, Vol. 6, No. 2, 2015, p. 207-221.

Research output: Contribution to journalArticleAcademicpeer-review

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