Ubiquitous environments facilitate the collection of information pieces from sensors, databases, or mobile devices in order to compose the context of entities like users, places, or things. The context obtained in this way can be used to automatically adapt the behavior of services, which results in the new paradigm of context-aware services (CASs). In recent years, a lot of research has covere...

Research in advanced context-aware systems has clearly shown a need to capture the inherent uncertainty in the physical world, especially in human behavior. Modelling approaches that employ the concept of probability, especially in combination with Bayesian methods, are promising candidates to solve the pending problems. This paper analyzes the requirements for such models in order to enable us...

Context awareness is increasingly gaining applicability in interactive ubiquitous mobile computing systems. Each context-aware application has its own set of behaviors to react to context modifications. This paper is concerned with the context modeling and the development methodology for context-aware systems. We proposed a rule-based approach and use the adaption tree to model the adaption rul...

Privacy is recognized as a fundamental issue for the provision of context-aware services. In this paper we present work in progress regarding the definition of a comprehensive framework for supporting context-aware services while protecting users’ privacy. Our proposal is based on a combination of mechanisms for enforcing context-aware privacy policies and k -anonymity. Moreover, our proposed t...

Locationand context-aware services are emerging technologies in mobile and desktop environments, however, most of them are difficult to use and do not seem to be beneficial enough. Our research focuses on designing and creating a service-oriented framework that helps locationand context-aware, client-service type application development and use. Location information is combined with other conte...

Developing pervasive context-aware systems to construct smart space applications has attracted much attention from researchers in recent decades. Although many different kinds of context-aware computing paradigms were built of late years, it is still a challenge for researchers to extend an existing system to different application domains and interoperate with other service systems due to heter...

In this paper we present the rationale and the main components of a modular and extensible architecture for building and deploying mobile hypermedia software. Using some simple archetypical examples we show how to provide context-aware assistance to the mobile user, as he explores the physical world. We also show that this kind of software systems poses strong requirements on supporting softwar...

Since smart phones with diverse functionalities become the general trend, many context-aware services have been studied and launched. The services exploit a variety of contextual information in the mobile environment. Even though it has attempted to infer activities using a mobile device, it is difficult to infer human activities from uncertain, incomplete and insufficient mobile contextual inf...

This deliverable reviews the state of the art of research related to the support of attention in systems for collaboration and learning. It presents the most relevant results in attention-related research in cognitive psychology. It introduces systems that have been designed with the explicit aim of supporting some attentional processes. It provides an overview of the specific issues related to...

This paper concerns personal privacy and privacy protection in context-aware ubiquitous computing environments. It proposes a privacy ontology solution to facilitate automated processes in privacy control. The development of the privacy ontology is an integrated part of our ongoing effort towards a privacy-respecting middleware solution for context-aware systems.