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 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)
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)
Distributed multimedia systems should deal with a diversity of hardware devices and operating systems issues. In such a context, we present a component-based framework for configuration and management of resources of open, distributed multimedia systems. In order to provide a generic and reusable approach, the framework explores the concept of properties to(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)
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)
Interactive digital television systems should adopt concepts of adaptation in order to make possible the development of configurable and extensible applications. On the other hand, software component technologies allow software designers to design, develop, maintain and evolve software systems based upon the integration, substitution and adaptation of(More)
This paper presents a parallel implementation approach of selective harmonic compensator for active power filters. This approach uses field programmable gate array (FPGAs) in order to reduce the compensator computational time. To compensate for even a small number of harmonics digital filters require multiple calculation instructions involving(More)