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…

This paper describes the new features included in the Robolab 2 System, which permits the students to
work with a simulation of and industrial robot and carry out operations with the real robot through teleoperation.
Among these features, the flexibility…

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…

Virtual and remote laboratories have improved
learning and training in the academic community. They allow students to acquire methods, skills and experience related to real equipment in an intuitive and cost-effective way. The purpose of this paper is to present…

In this note, I propose two extensions to the Java virtual machine (or VM) to allow dynamic languages such as Dylan, Scheme and Smalltalk to be efficiently implemented on the VM. These extensions do not affect the performance of pure…

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…

La utilización de bases de datos distribuidas (BDD) o de bases de datos federales o federativas (DBF) representan una solución viable para los usuarios cuando deben optar para la generación de sus sistemas de información. La utilización de estas bases…

Acantholybas steinbaueri, a brachypterous new species, is described and illustrated from Java (Bali Island and Dammerman). The genus Acantholybas is redescribed, and a key to the four known species is provided.

Segunda parte de la presentación sobre Java.

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…