Adilson B. Lopes

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A middleware for interactive digital television systems should harmonize and abstract discrepancies related to hardware and operating systems issues. In such a context, this paper describes an XML-based model for specifying components of an adaptive middleware for interactive digital television systems, in which component specifications play a fundamental(More)
Interactive digital television systems should provide concepts of middleware for harmonizing and abstracting discrepancies related to hardware and operating systems issues. In such a context, this paper explores a framework for configuration and management of open, distributed multimedia systems with the purpose of designing and developing a component-based(More)
The communication between multimedia components located on the same physical machine, but in different address space, uses mechanisms designed for distributed environments. The present paper proposes an inter-component communication model in this context through the use of a shared memory mechanism. This model is based on the shared memory primitives(More)
Multimedia systems should deal with critical issues such as real-time requirements of audio and video. Such requirements can become more complex when applications are executed in different platforms including different technologies, such as Internet and interactive digital television systems. In such a context, this paper proposes a QoS management and(More)
Applications in distributed multimedia systems need to manage the levels of quality of services in environments that have wide variations of operation properties. So, most of the recent researches are directed towards the establishment of criteria that lead higher quality of services levels. For this, they consider the availability of resources in the(More)
The process for choosing the best architectural elements to build systems has become increasingly complex. It becomes more critical if it is necessary to consider many combinations of components in the context of an architectural configuration. This paper proposes an approach for the dynamic selection of architectural configurations based on quality of(More)
Nowadays, self-adaptive systems use the concept of feedback loops. This approach is based on the selection of components that conform to the expected requirements. The selection became increasingly complex in such systems due to the variety of criteria. This paper proposes a process for dynamic selection of components using multi-attribute utility theory(More)
Distributed multimedia systems should deal with critical issues such as temporal requirements of audio and video. Such requirements can become more complex when applications are executed in interactive digital television systems, since there is a diversity of hardware devices, operating systems and communication technologies. In order to fulfil the(More)
Distributed multimedia systems must provide support for interaction between its components, and this can be done by using different strategies and mechanisms of communication. A possible way to define efficient communication mechanisms is to consider the location of the involved components. In this context, this paper presents a model and its implementation(More)