Expressing user profiles for data recharging

We are rapidly heading towards a world in which the computing infrastructure will contain billions of devices that are carried or worn by their users as they go through their daily routines. These devices require two key resources to function: power and data. The mobile nature of such devices combined with the economic limitations of size and cost makes it impractical to keep them continually connected to fixed sources of either resource. Mobile devices cope with disconnection from fixed sources of power and data by “caching”. For power, devices typically use rechargeable batteries; batteries act as a cache of power from the fixed power grid. Likewise, data from the “information grid” (i.e., the Internet) is cached in device-local storage (memory, flash memory, or disk, etc.) for use by the applications running on that device.