Non-repudiation is a security service that provides cryptographic evidence to support the settlement of disputes. In this paper, we introduce the state-of-the-art of non-repudiation protocols for multiple entities. We extend an existing multi-party non-repudiation (MPNR) protocol to allow an originator to send different messages to many recipients in a single transaction. We further propose an ...

This work considers the dynamic modeling and simulation of a DC hybrid power system for rural base transceiver station in Nigeria currently being powered by an AC diesel generator (DG). The transient behaviour is studied under varying solar irradiation to ascertain stability supplied sensitive telecommunication equipment. Each component designed simulated MATLAB/Simulink environment connected f...

In this paper we estimate the business telecommunications demands for local, intra-LATA and inter-LATA services, using US data from a Bill Harvesting R © survey carried out during 1997. We model heterogeneity, which is present among firms due to a variety of different business telecommunication needs, by estimating normal heteroskedastic mixture regressions. The results show that a three-compon...

The technological revolution witnessed by the telecommunications industry is leading to the development of new applications, products and protocols, which in turn solicits widely accessible, highly reliable and high quality networks. To meet the stringent quality and reliability requirements of today’s complex communication networks, efficient test methodologies are necessary at all levels. Con...

In the early days of telecommunication,' technically advanced nations quickly recognized the usefulness of the telegraph in international commerce. There was, however, a considerable obstacle to the development of the new technology's commercial potential. As one observer of this era of telecommunication history points out, "humanity could not fully benefit from all the miraculous possibilities...

Up to now, a lot of efforts have been made for the management of telecommunication networks and equipment, but less effort has been made for the realization of higher-layer service and business management. Common Object Request Broker Architecture (CORBA) provides the infrastructure for interoperability of various object-oriented management applications in a distributed environment, and being w...

We describe the development of artificial neural networks (ANN) for the prediction of the properties of ceramic materials. The ceramics studied here include polycrystalline, inorganic, non-metallic materials and are investigated on the basis of their dielectric and ionic properties. Dielectric materials are of interest in telecommunication applications where they are used in tuning and filterin...

Telecommunication operators currently servicing mobile users world-wide have dramatically increased in the last few years. Although most of the operators use similar technologies and equipment provided by world leaders in the field such as Ericsson, Nokia-Siemens, Motorola, etc, it can be observed that many vendors utilize propriety methods and processes for maintaining network status and colle...

Convergent telecommunication network (CTN) is new object of research. It can't be carried directly to such known classes of networks as data transfer networks, telephone and data-processing networks, etc. [1] Accordingly, models of the processes proceeding in existing telecommunication networks (TN) and based on them methods of calculation of various parameters including the network equipment i...