Middleware and Context Inference Techniques from DataStreams for the Development of ContextAware Services using Mobile Devices

The ubiquity of the mobile communication devices, such as smartphones, allowed the emergence of context aware applications and services, which proactively respond to activities or specific situations of each user. The context information, that is, the specific state in which each user finds himself, allows the communication providers the development, and consequently the offer, of new services of added value to a great range of applications, such as social networks, advertising, navigation or leisure. Of growing importance are services and applications, related to the health sector, that depend on the precise detection of each users physical activity, whether in specific cases or along several days or weeks. Using this information, it is possible to discover and analyze the physical activity patterns and, for example, help individuals to have healthier life styles.