Nelson Souto Rosa

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The miniaturization of hardware components has lead to the development of Wireless Sensor Networks (WSN) and networked-applications over them. Meanwhile, middleware systems have also been proposed in order to both facilitating the development of these applications and providing common application services. The development of middleware for sensor networks,(More)
A wireless sensor network (WSN) consists of a large number of small devices with computational power, wireless communication and sensing capability. These networks have been developed for a wide range of applications, such as habitat monitoring, object tracking, precision agriculture, building monitoring and military systems. Meanwhile, middleware systems(More)
Non-functional requirements (NFRs) are rarely taken in account in most software development. There are some reasons that can help us to understand why these requirements are not explicitly dealt with: their complexity, NFRs are usually stated only informally, their high abstraction level and the rare support of languages, methodologies and tools. In this(More)
The adoption of MDA in software development is increasing and is widely recognized as an important approach for building software systems. However, there's a lack of standard terminology and notation addressing design aspects of an MDA process. The available MDA tools and environments are particularly focused in defining and executing model transformations,(More)
Wireless sensor networks (WSNs) have great potential for many distributed applications in different scenarios. As they grow in popularity and importance, it becomes increasingly desirable and necessary to share their data over the Internet. This paper presents an energy-aware middleware that focuses on integrating the Internet andWSNs at service level by(More)
The concept of software architecture has created a new scenario for incorporating non-functional and transactional requirements into the software design. Transactional and non-functional requirements can be included in an architecture-based software development through formal approaches in which rst-order and temporal logic are utilised to deal with them.(More)
Wireless Sensor Networks (WSNs) consist of hundreds or thousands of sensor nodes with limited processing, storage, and battery capabilities. There are several strategies to reduce the power consumption of WSN nodes (by increasing the network lifetime) and increase the reliability of the network (by improving the WSN Quality of Service). However, there is an(More)
Web services have played an important role in the development of distributed systems. In particular, the possibility of composing already implemented web services in order to provide a new functionality is an interesting approach for building distributed applications and business processes. The possibility of dynamically composing web services is also(More)