Universal coding for correlated sources with complementary delivery

This paper deals with a universal coding problem for a certain kind of multiterminal source coding system that we call the complementary delivery coding system. In this system, messages from two correlated sources are jointly encoded, and each decoder has access to one of the two messages to enable it to reproduce the other message. Both fixed-to-fixed length and fixed-to-variable length lossless coding schemes are considered. Explicit constructions of universal codes and bounds of the error probabilities are clarified via type-theoretical and graph-theoretical analyses. [[Keywords]] multiterminal source coding, complementary delivery, universal coding, types of sequences, bipartite graphsComment: 18 pages, some of the material in this manuscript has been already published in IEICE Transactions on Fundamentals, September 2007. Several additional results are also include

Changing boundaries and structure of a technological system: lessons from UK retail banking

This article investigates the factors that have induced and shaped the process of industry evolution of banking in the United Kingdom and, in particular, the reorganization of the retail payments system. It will look at how the effects of technical progress within a changing regulatory framework have contributed to the flourishing of new consumer services, of increasingly specialized technologies and of new models of business organization. In relation to these issues, the paper develops an interpretative framework based on the rapidly expanding body of literature on technological systems. In so doing it argues also that the organization of the payment system has evolved towards a multilayered and increasingly heterogeneous industry in which competition has been fuelled at different levels by the growing diversity of the ecology of agents involved, as well as by the emerging patterns of interaction across them.

Changing boundaries and structure of a technological system: lessons from UK retail banking

This article investigates the factors that have induced and shaped the process of industry evolution of banking in the United Kingdom and, in particular, the reorganization of the retail payments system. It will look at how the effects of technical progress within a changing regulatory framework have contributed to the flourishing of new consumer services, of increasingly specialized technologies and of new models of business organization. In relation to these issues, the paper develops an interpretative framework based on the rapidly expanding body of literature on technological systems. In so doing it argues also that the organization of the payment system has evolved towards a multilayered and increasingly heterogeneous industry in which competition has been fuelled at different levels by the growing diversity of the ecology of agents involved, as well as by the emerging patterns of interaction across them.

State-of-the-art in Power Line Communications: from the Applications to the Medium

In recent decades, power line communication has attracted considerable attention from the research community and industry, as well as from regulatory and standardization bodies. In this article we provide an overview of both narrowband and broadband systems, covering potential applications, regulatory and standardization efforts and recent research advancements in channel characterization, physical layer performance, medium access and higher layer specifications and evaluations. We also identify areas of current and further study that will enable the continued success of power line communication technology.Comment: 19 pages, 12 figures. Accepted for publication, IEEE Journal on Selected Areas in Communications. Special Issue on Power Line Communications and its Integration with the Networking Ecosystem. 201