01717nas a2200181   4500008004100000245006200041210006100103260000900164300001200173490000600185520111700191653002201308653002901330653002501359100001601384700001801400856011701418       2010                        eng d00aBuilding context-awareness models for mobile applications0 aBuilding contextawareness models for mobile applications  c2010  a78 - 870 v83 aThe design process followed to produce traditional applications needs to be enhanced to cope with new context-aware ubiquitous application requirements. With the popularity of ubiquitous computing, context-aware applications become clearly necessary. This new kind of applications allows mobile users to universally access services in respect to any context including his computing environment. Challenges for the design of such applications are to easily define context collection requirements, context analysis and adaptations of the applications due to changes in its environment. To face these issues, we propose, in this article, a generic and extensible way to model context-awareness of any application using the model-driven engineering (MDE) approach. For this purpose, we add a context-awareness aspect to application model views. We illustrate our solution by modeling a context-aware e-commerce application. The addition of a context-awareness aspect, should ease the definition of mobile applications. Furthermore, context-awareness models open the way to automate context-awareness code production.10aContext-awareness10aModel driven engineering10aUbiquitous computing1 aTaconet, C.1 aKazi-Aoul, Z.  uhttp://www.scopus.com/inward/record.url?eid=2-s2.0-79960676592&partnerID=40&md5=bec59c3aa9c877ef871154ab0b7c4a0c02384nas a2200205   4500008004100000245011600041210006900157260000900226300001400235490000600249520167200255653002501927653001801952653001201970653002301982653002502005100001602030700001502046856011702061       2009                        eng d00aTowards awareness of privacy and quality of context in context-based access control for ubiquitous applications0 aTowards awareness of privacy and quality of context in contextba  c2009  a219 - 2260 v73 aThe growing advancement of wireless communication technologies, mobiles devices, and sensors enable new oportunities for users to share resources anytime and anywhere, making access control a critical concern. Such sensor-rich environments should be able to offer distributed and dynamic access to resources according to context information, such as user's location and time. In this scenario, the access control decisions should be based also on context information. However, as context information represents real-world situations, it is associated with certain quality indicators, such as up-to-dateness and precision, which can directly affect the access control decisions. Furthermore, enforcing user's privacy policies on context information can decrease the quality of context (QoC) information used for making access control decisions. Quality of context has in fact a strong impact on the suitable behavior of contextbased access control models. Using context information with inadequate quality may increase the probability of incorrect access control decisions. Therefore, it is important to take into account also the QoC while enforcing context-based access control policies. This paper proposes a Context-Based Access Control Model that takes into account context information and its QoC indicators to grant and to adapt access permissions on resources for Ubiquitous Computing Environments. A new module to evaluate QoC indicators was integrated in our context management architecture that is being used by proposed access control model. Moreover, we present an application called PhotoMap that uses the proposed model for controlling access to photos.10aAccess control model10aContext-aware10aPrivacy10aQuality of context10aUbiquitous computing1 aFilho, J.B.1 aMartin, H.  uhttp://www.scopus.com/inward/record.url?eid=2-s2.0-77953237856&partnerID=40&md5=ea8d4b294375a77ff9f0320a1f0d098a