MDIRS is methodology to define the actors and the steps to build efficiently information retrieval (IR) System. MDRIS main mission is to analyze, develop and evaluate mechanisms and tools to produce IR systems from a more abstract, high level, efficient and productive way than it is done currently. MDIRS project is influenced by MDA reference model, and is mainly based on three principles: namely, high-level models specification; generative programming techniques; and it is component-based architecture-centric. In this paper we detail the methodology generative programming techniques used to produce IR Systems and the work that will be handled in the near future.

This paper deals with the problems associated with full-duplex scrambled speech communications over analog two-wire telephone networks. The goal is not to describe particular scrambling systems or methods, but to analyze the situation in which the two users speak at the same time and each should hear the other. Current telephone scrambling devices preclude this feature. A general half-duplex scrambling model is described as a base to the discussion of pseudo- and true full-duplex communications. Finally, a novel true full-duplex scrambling architecture based on a paper by Cox and Tribolet [11] is presented.