By David Merrill, Pattie Maes (auth.), Anthony LaMarca, Marc Langheinrich, Khai N. Truong (eds.)
This e-book constitutes the refereed court cases of the fifth foreign convention on Pervasive Computing, PERVASIVE 2007, held in Toronto, Canada in may possibly 2007.
The 21 revised complete papers offered have been conscientiously reviewed and chosen from 132 submissions. The papers are geared up in topical sections on achieving out, context and its program, safety and privateness, realizing use, sensing, in addition to discovering and positioning.
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Extra info for Pervasive Computing: 5th International Conference, PERVASIVE 2007, Toronto, Canada, May 13-16, 2007. Proceedings
These should be interpreted as the perceptions of very experienced mobile phone users, accustomed to delays in downloading data services on pre-3G networks. Some participants found that the screensaver and keyboard lock features on the phone interfered with the use of NFC. One could read a tag with the screensaver or the keyboard lock enabled, but had to unlock the keyboard before the corresponding service could be accessed or viewed on the screen. Given that reading an NFC tag is intended to require an explicit user action, participants felt that reading a tag should automatically turn off the screensaver and keyboard lock.
With multiple adjacent 2D barcodes, the reader had difficulty in interpreting a single tag when parts of more than one barcode appeared in the camera’s viewfinder, so distance to the tag and image composition became important. To investigate these effects in our main experiment, we arranged multiple tags in different patterns on the posters and varied which of the group of tags the user was required to read. In our experimental pilot, we found that the fastest 2D barcode reading was achieved with the phone approximately 100mm from the tag, in contrast to the optimal distance of about 20mm found with the NFC tags.
The trial administrators and 17 “wizards” (staff who were very familiar with the technologies) were available to provide help and advice to the participants throughout the study. The data services were delivered via an NFC server implemented for the trial. e. reading the “trial helpline” and “directory assistance” tags), in which a voice call was placed directly to the service provider. At the end of the trial, 47 of the participants completed a post-trial questionnaire. This covered their experiences during the field trial, and their comments and suggestions for future applications and uses of NFC based services.