Citron: Context Information Acquisition Framework for Muffin

It is expected that personal devices should be more intellecutual and reliable presence for the user in the ubiquitous computing environment. Context awareness is significant ability to realize such expectation, however, it has not been enough discussed that what type of sensors are effecient and context are acquirable in the existing research. We have developed Muffin which has 15 sensors and capability for context acquisition and applied it as a device for discussion. By examination of Muffin, we found remarkable requirements to recognize context in practical usage. We developed Citron which is middleware to implement these requirements and enable more reliable and robust context acquisition. In this paper, we show effectivity of our approach and possibilities in such a multiple sensory device from the evaluation.