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The recent advances in the Internet of Things (IoT) area, which has provided an increasing availability of networked sensors and actuators, has given a new perspective to research in the sensor data processing in IoT. In this sense, the main contribution of this paper is the proposition of COIOT (COntext + IOT), a rule-based architecture proposal for distributed sensing in IoT designed with the aim...
The recent advances in the Internet of Things (IoT) area, which has provided an increasing availability of networked sensors and actuators, has given a new perspective to research in the sensor data processing in IoT. In this sense, the main contribution of this paper is the proposition of COIOT(COntext + IOT), an architecture proposal for distributed sensing in IoT designed with the aim of providing,...
The recent advances in the Internet of Things (IoT) area, which has provided an increasing availability of networked sensors and actuators, has given a new perspective to research in the context awareness in UbiComp. In this sense, the main contribution of this paper is the proposition of COIOT, an architecture for IoT designed with the aim of providing, through rules, the proactive management of...
The amount of data that human activities generate poses a challenge to current computer systems. Big data processing techniques are evolving to address this challenge, with analysis increasingly being performed using cloud-based systems. Emerging services, however, require additional enhancements in order to ensure their applicability to highly dynamic and heterogeneous environments and facilitate...
This work proposes a new and flexible unreliable failure detector, denoted Impact Failure Detector (FD), whose output gives the trust level of a set of processes. By expressing the relevance of each node by an impact factor value as well as an acceptable margin of failure in the system, the Impact FD enables the user to tune the failure detection configuration in accordance with the requirements of...
Requirements for data storage and processing have reached new levels, with applications relying on the analysis of large amounts of data in order to support everyday life services to end users. Since the costs of maintaining and managing databases are significant, change data capture (CDC) techniques can be used to determine which parts of a data source have changed, and thus assist in the management...
The applications in Ubiquitous Computing (UbiComp) environments must be aware of their contexts of interest and adapt to changes in them. Thus, a major research challenge in the area of UbiComp is related to context awareness. Considering the high distribution, heterogeneity, dynamism, and mobility of ubiquitous environments, this paper presents an architecture for context awareness, named UbiC (Ubiquitous...
One of the major research challenges of Ubiquitous Computing (UbiComp) is related to the need of the applications being aware of the situational context awareness, and when appropriate, respond to it. This paper presents an architecture for situation awareness, called EXEHDA-SA (Execution Environment for Highly Distributed Applications-Situation Awareness). We consider that the main contribution of...
Message ordering is one of the cornerstones of reliable distributed systems. However, some ordering guarantees, such as atomic order, are expensive to implement in terms of message delays. This paper presents Optimistic Atomic Multicast, a protocol that combines reduced latency and increased throughput. Messages can be delivered optimistically in a single communication step and conservatively in three...
In this paper we present a view of EXEHDA middleware and a novel service created for dynamic adaptation. EXEHDA is service-oriented, adaptive and was conceived to support the execution of ubiquitous applications. The main concept in the proposed design for the middleware and for the application is context awareness expressed in an adaptive behavior. The middleware manages and implements the follow-me...
Ubiquitous computing (Ubicomp) environments are characterized by high distribution, heterogeneity and dynamism. In these environments, applications must be aware of their contexts and adapt to changes in them. A major research challenge in the area of Ubicomp is related to context awareness. Considering the characteristics of ubiquitous environments, this paper presents an architecture for context...
In Ubiquitous Computing the systems must provide mechanisms to promote the cooperation among users through interoperability of their applications. With this motivation, this paper presents the EXEHDA-TS, which is a distributed mechanism for coordination of applications in Ubiquitous Computing. The proposed software architecture has proactive behavior and allows a dynamic control of communication costs,...
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