IP Networks, and particularly the Internet, were proposed to be a simple and robust support for heterogeneous communications. This implies that only basic controls have to be done by network elements. Connection management, along with transport, and more generally communication…

In this paper a methodology for accesing scientific data repositories on data grids is proposed. This methodology is based on ontology specification and knowledge representation. The concept of Knowledge Perspective is introduced, as the action of applying particular scientific conjectures…

This article introduces an approach to anomaly intrusion detection based on a combination of supervised and unsupervised machine learning algorithms. The main objective of this work is an effective modeling of the TCP/IP network traffic of an organization that allows…

The Knowledge Engineering Suite is an ontology production method, based on relationship networks, for knowledge representation inside specific contexts. The production of these ontologies has three basic steps, since catching the client data, knowledge base creation, and information retrieval and…

This paper proposes an original generic hierarchical framework in order to facilitate the modeling stage of complex autonomous robotics mission planning problems with action uncertainties. Such stochastic planning problems can be modeled as Markov Decision Processes [5]. This work is…

Given an instance of an optimization problem together with an optimal solution, we consider the scenario in which this instance is modified locally. In graph problems, e. g., a singular edge might be removed or added, or an edge weight…

As tarefas da e-tutoria estão bem identificadas e categorizadas e existe consenso nas classificações propostas. Contudo, precisamos de ter uma ideia clara de quais são as tarefas dos tutores que os estudantes mais valorizam. Esse conhecimento pode contribuir para uma…

Este artigo tem por base uma investigação sobre a implementação de ambientes de ensino e aprendizagem mais ricos, criadores de contextos mais estimulantes e mais desafiantes, que permitam aos alunos desenvolver a sua capacidade para explorar, conjeturar, raciocinar e relacionar…

Humans have always been intrigued by their ability to reason. We have constantly attempted to emulate this process, trying almost everything, from physiological explanations, to sociological accounts. The approach with possibly the longest tradition conceives this process as a mere…

National Research and Education Network organizations (NRENs) provide advanced information and communication technology (ICT) services for the academic community of their country. Their focus is often on providing affordable high speed bandwidth amongst their members and to other research networks,…