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Activity-aware systems have inspired novel user interfaces and new applications in smart environments, surveillance, emergency response, and military missions. Systems that recognize human activities from body-worn sensors can further open the door to a world of healthcare applications, such as fitness monitoring, eldercare support, long-term preventive and(More)
We present Bonfire, a self-contained mobile computing system that uses two laptop-mounted laser micro-projectors to project an interactive display space to either side of a laptop keyboard. Coupled with each micro-projector is a camera to enable hand gesture tracking, object recognition, and information transfer within the projected space. Thus, Bonfire is(More)
Recent research has explored ways to obtain and use knowledge of person-object interactions. We present a novel pair of wearables, a glove and a bracelet, that detect when users interact with unobtrusively tagged objects. The glove can also report whether the grasp was with the palm or the fingertips. Both devices have been built and deployed. We present(More)
Ubiquitous computing applications often use a user's context to automatically adjust their behavior to the situation. We have developed three types of wireless sensor nodes that can be worn, carried, or embedded in the environment that can provide interesting contextual information: a rich multi-sensor node to infer human activity that can be worn by a(More)
We have developed a collection of portable platforms to enable context-aware applications to help users with their personal fitness. Our approach has been to focus on established form-factors such as cellphones and wrist-watches for the user interfaces. A variety of sensors are used to infer aspects of the user's context and proactively gather and display(More)
Informal note taking is a significantly different task from note taking in structured settings. This type of activity requires a special set of requirements including a substantial lowering of hurdles to capture and access across a variety of environments. Cepher is a prototype note capture system that supports the capture and retrieval of short notes(More)
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