A lot of research has been done in the area of context-aware computing. Even though, the term context seems often not to be well defined. We attribute this problem partly to the fact that research often focuses on syntactical and technical issues of contextuality and does not take a knowledge level perspective on context. When including the knowledge level, some sort of analysis is required on ...

Attempts to identify an intermediate unit between collective activity and individual action within activity theory are useful and necessary. While several possible conceptualizations have been put forward, engagement is a relevant candidate for naming such a unit. However, the elaboration of such a unit opens up difficult theoretical questions which should not be overlooked. To avoid shortcuts ...

Roles are convenient and powerful concept for facilitating access to distributed systems and enforcing access management polices. RBAC is one the most widely used role engineering models in enterprises. Several threats arise due to insecure and inefficient design of roles when social and interaction dynamics in an organizational setting are ignored. Activity theory is one of the most applied an...

Background and objective: diabetes is the most common endocrine glands disease. Among the factors contributing to increased incidence of diabetes in adolescents is lack of physical activity. Various studies indicate prevalence of sedentary lifestyle in children and adolescents. Therefore, in this research the factors affecting performing physical activity have been examined with the aim of prev...