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Communication Networks Economy
In an increasingly interconnected world, "Communication Networks Economy" provides the rational understanding necessary to provide universal access to communication means in an efficient way. This book presents the principal elements of the economics of a network as it stands today, taking into account experiences of technicians in the field. The author gives a simplified picture of the current situation in terms of structures and architecture of a network, bearing in mind the necessary quality of service and the profitability of investments, accompanied by references to recent economic works. An overview is given on the general themes of regulation and tariff principles, and the relations between supply and demand, from the perspectives of professional and residential users and network operators. Different aspects of the present situations of networks and the incidence of the Internet on the economy are also presented. In conclusion, the reader will obtain an overview of the most significant issues likely to influence the economics of communications networks as they are today.
La pluie n'a pas cessé de la nuit
« Je marchais vers la mer, vers l’enfant. Il faisait noir. Le long de la voie ferrée, le visage en sang, les mains tendues en avant, crispées. Je râlais aussi, souffle ténu et aigre d’une flûte qu’on étrangle. Je me disais, au bout de ce chemin, de cette voie ferrée, il y a la mer... Je m’y jetterai, je me laverai de tout ce sang qui dégouline sur ma figure et dans mon cou, dans mon dos. Et peut-être qu’il m’attendra sur la plage, avec son petit bonnet passe-montagne et son duffle-coat marine. » Dominique Solamens
New Telecom Networks
Nowadays, the Internet has become an irreplaceable tool, feeding us information about new innovations and the evolution of the markets relating to all human activities. What the Internet lacks, though, is a guiding narrative thread, which is crucial to understand the evolution from old technologies into the technologies available today, and to benefit from the commentary which could elucidate that process of evolution. In spite of its inherent richness, no encyclopedia can constitute the one and only referential information source. The actors involved also have the right to be heard: all those who have devoted their working lives to the collective effort of edifying networks can, of course, ...
Secrets de guerre
Pistes à exploiter en classe : a) Relevez dans le texte tous les détails qui permettent de faire la description des personnages de Daniel et Franz. Comparez-les . b) Qu'est-ce que signifie « la frontière imaginaire » dans la cour d'école ? c) Relevez dans le texte les détails qui marquent la présence de l'armée allemande. d) Imaginez une autre fin à l'histoire.
Transitions from Digital Communications to Quantum Communications
This book addresses the move towards quantum communications, in light of the recent technological developments on photonic crystals and their potential applications in systems. The authors present the state of the art on extensive quantum communications, the first part of the book being dedicated to the relevant theory; quantum gates such as Deutsch gates, Toffoli gates and Dedekind gates are reviewed with regards to their feasibility as electronic circuits and their implementation in systems, and a comparison is performed in parallel with conventional circuits such as FPGAs and DSPs. The specifics of quantum communication are also revealed through the entanglement and Bell states, and mathematical and physical aspects of quantum optical fibers and photonic crystals are considered in order to optimize the quantum transmissions. These concepts are linked with relevant, practical examples in the second part of the book, which presents six integrated applications for quantum communications.
