Currently, the telecommunications management systems are powerful, however, maintain centralized and proprietary platforms, limiting this way, the growth of these telecommunications networks. This factor generates the need for scalable and open systems, stimulating the sectors of the telecommunications area to…

Este trabalho apresenta uma forma de transformar aplicações orientadas a objetos tolerantes a falhas de crash, podendo ser utilizado em um ambiente distribuído baseado em objetos que se comunicam entre si, a fim de executarem uma ação. Para garantir a…

Los lenguajes orientados a objetos son utilizados en la programación de agentes y, ge- neralmente, satisfacen muchos de sus requerimientos pero presentan inconvenientes en la representación y tratamiento de actitudes mentales. Los lenguajes lógicos permiten repre- sentar actitudes mentales en…

Authentication techniques for a large-scale network are essential for the booming applications of e-commerce and e-business. In this thesis, authentication techniques for a larger-scale network are discussed. In-deep discussions on the independent path technique are presented. An authentication protocol based…

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…

In the context of an object-oriented programming language such as Java, the ubiquitous use of instance fields and the presence of pointers (references to objects) make it difficult to understand a program's memory usage. Understanding memory usage is a key…

Mobile agents are often described as a promising technology moving towards the vision of a widely distributed scalable electronic market. The deployment of electronic services, especially in the area of electronic commerce, raises essential questions closely related to security issues.…

Virtual method calls are a fundamental feature offered by Java, an object-oriented programming language. However, they are also a source of degradation of performance at run time and imprecision in interprocedural analyses. There are several well known, inexpensive analyses that…

We present a new approach to eliminate array bounds checks in Java by using static analyses. Our approach is based upon a flow-sensitive intraprocedural analysis called variable constraint analysis (VCA). VCA collects constraints between locals related to array references. The…

E-commerce is a new way of doing business. It is becoming increasingly important to everybody. The objective of this thesis is to compare various design approaches and to find out the best solution for small businesses. Some commonly used technologies…