In third generation multi-operator mobile telecommunication systems, terminal operations will allow users to select the desirable operator among the ones available, provided that the user access rights are maintained. In this paper, three alternative (interoperator) roaming scenarios between public and private operators are proposed. The first scenario considers private operators as autonomous ...

This paper proposes a new virtual reality telecommunication system (VRTS) terminal known as 3D videophone to realize satisfactory face-to-face communication. The 3D effects that can be felt through the system, which are mainly based on the protruding images on the screen are highlighted and evaluated. The preliminary evaluation is to verify that 3D moving images are closer to natural compared t...

In this work a discrete and a dynamic model for evaluating the reliability of telecommunication networks, are defined, in the case where the set of terminals K is arbitrary. Three methods are presented. The first one is exact type called generalized method of Ahmad, while the two others are approximate and simulation-based type. The three methods are compared by an application to the Bejaia di...

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 multi-party non-repudiation protocols, and analyze the previous work where one originator is able to send the same message to many recipients. We propose a new multi-party non-repudiation protocol for sending different messages to ...

Purpose – The aim of this study is to examine relation between employees’ participation in the organizations decisions making and their psychological empowerment in Iran Telecommunication Company subsidiary of Mazanderan Province. Design / methodology /approach- 250 employees from the Iran Telecommunication Company subsidiary of Mazanderan Province participated in this study. A Spearman's cor...

Distributed Feature Composition (DFC) is a new component-based architecture for telecommunication services. Its principles are similar to the well-known pipe-and-filter architecture, adapted for use in the telecommunication domain. We present an overview of this architecture and explain how it might be used as a basis for componentbased development of telecommunication software. We also describ...

We survey different optimization problems under uncertainty which arise in telecommunications. Three levels of decisions are distinguished: design of structural elements of telecommunication networks, top level design of telecommunication networks and design of optimal policies of telecommunication enterprize. Examples of typical problems from each level show that the stochastic programming par...

Telecommunication tower is an important component of the basic infrastructure of communication systems and thus preserving them in events of natural disasters - such as a severe earthquake - is of high priority. In past studies, researchers have mostly considered the effects of wind and earthquake-induced loads on 3-legged (triangular cross-section) self-supporting steel telecommunication tower...

According to current models of word recognition, the time to recognize a word would be affected by the frequency of its neighbors. The present study examined the role of neighborhood frequency in spoken word recognition, using a definition of the neighborhood in terms of the last candidates of the cohort aligned from onset with the input [8]. Two sets of disyllabic CVCV words were selected whic...