Abstract
A user of a smartphone may feel convenient, happy, safe, etc., if his/her smartphone works smartly based on his/her context or the context of the device. In this article, we deal with the position of a smartphone on the body and carrying items like bags as the context of a device. The storing position of a smartphone impacts the performance of the notification to a user, as well as the measurement of embedded sensors, which plays an important role in a device’s functionality control, accurate activity recognition and reliable environmental sensing. In this article, nine storing positions, including four types of bags, are subject to recognition using an accelerometer on a smartphone. In total, 63 features are selected as a set of features among 182 systematically-defined features, which can characterize and discriminate the motion of a smartphone terminal during walking. As a result of leave-one-subject-out cross-validation, an accuracy of 0.801 for the nine-class classification is shown, while an accuracy of 0.859 is obtained against five classes, which merges the subclasses of trouser pockets and bags. We also show the basic performance evaluation to select the proper window size and classifier. Furthermore, the analysis of the contributive features is presented.
Highlights
Mobile phones are getting smarter due to the advancement of technologies, such as microelectromechanical systems (MEMS), high performance and low power computation, called a smartphone
The bottom of a jacket sometimes flaps as a person walks, which makes the movement of a smartphone diverse
We proposed a method of localizing a smartphone on the body
Summary
Mobile phones are getting smarter due to the advancement of technologies, such as microelectromechanical systems (MEMS), high performance and low power computation, called a smartphone. Various sensors are embedded in or attached to a device, and a wide variety of contextual information can be extracted, which is about the user, the device and/or the environment. A phone carrying survey revealed that 17% of people determine the position of storing a mobile phone based on contextual restrictions, e.g., no pocket in the T-shirt, too large a phone size for a pants pocket, comfort for an ongoing activity [10]. These factors are variable throughout the day, and users change their positions in a day. The contributions of the paper are as follows: Information 2016, 7, 21; doi:10.3390/info7020021 www.mdpi.com/journal/information
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
