The objective of this work is to supply one more contribution to the scientific community presenting techniques that will be used in distributed systems that need file replications in real time guaranteeing the permanent availability of the system. As the…

As aplicações distribuídas estão potencialmente sujeitas a falhas. A orientação a grupos é uma boa ferramenta para garantir a continuidade da aplicação, mesmo na presença de falhas. Este artigo apresenta a implementação de um protocolo multicast confiável, para comunicação de…

The knowledge imperfections should be considered when modeling complex problems. A solution is to develop a model that reduces the complexity and another option is to represent the imperfections: uncertainty, vagueness and incompleteness in the knowledge base. This paper proposes…

The paper describes a framework for the implementation of an elearning system based on the Semantic Web, using software agents and Java Web Services. Hopefully we have elucidated the enormous potential of making web content machine-understandable. One of the killer…

El proceso de enseñanza y aprendizaje de los cursos iniciales de nivel superior que tienen por objeto introducir al estudiante en el diseño e implementación de algoritmos, puede ser favorecido mediante el uso de herramientas específicas que den soporten tanto…

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…

The rising complexity of distributed computer systems give reason to investigate self-organization mechanism to build systems that are self-managing in the sense of Autonomic and Organic Computing.
In this paper we propose the Artificial Hormone System (AHS) as a general…

During a system’s life cycle, new requirements or changes in the existing ones imply modifying the system. Aspect-oriented software development is a new approach to the modularization of systems, yet it does not provide mechanisms to aid the evolution of…

Las tecnologías de la información y las comunicaciones han avanzado en forma notable en los últimos tiempos, siendo el paradigma de Internet el emblema de este desarrollo. Es posible hoy operar dispositivos a distancia en base a las tecnologías integradas…

JAVA is a general purpose concurrent class-based object-oriented programming language. This work presents an interactive program that interprets JAVA source programs directly. The cornerstone of its execution model is an execution graph, in which each node is constituted by three…