This paper proposes an approach to improve the level of Quality of Experience (QoE) that
distributed database systems provide. Quality of Experience is a measure of users' …

In the last few years, highly distributed, heterogeneous and dynamic environments have
become usual contexts for scientific and business domains. In this work, we consider query …

Proceedings Template - WORD Page 1 1 The Next Challenge for Database Systems: to Satisfy
Users Rogério Luís de Carvalho Costa DEI – University of Coimbra - Portugal …

In the last few years, the Grid technology has emerged as an important tool for many
scientific and commercial global organizations. In grid-based systems, intelligent job …

Reputation systems use historical information about a service as the basis to predict its
future behavior. In this work, we present a reputation-based task scheduling strategy for …

Cloud computing is a recent trend of technology aimed at providing on-demand Information
Technology (IT) services usually priced on a pay-per-use model. One of the main services …

Globally accessible data warehouses are useful in many commercial and scientific
organizations. For instance, research centers can be put together through a grid …

The computational grid offers services for efficiently scheduling jobs on the grid, but for grid-
enabled applications where data handling is a most relevant part, the data grid kicks in. It …

Agradeço muito ao Daniel de Oliveira por toda ajuda durante todo o mestrado, pela sua
orientação, paciência e boa vontade em todos esses meses. Esse trabalho só foi possível …