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Our analysis considers two elements that impact the ability of battery-powered
devices to participate in maintenance tasks to support collaborative applications:
the churn rate of the nodes and the battery constraints of the devices. If nodes are
only briefly online, the overhead, for example network traffic, required to allocate
the appropriate maintenance tasks may be too cumbersome. Further, VPN network configuration without
sufficient battery are unlikely to want to contribute this valuable resource to
tasks that do not directly benefit the user. Our results suggest that laptop users
demonstrate rather stable usage patterns: often staying online for over 1 hour and
often charging their laptops for the entire duration of their session.
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