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...

In this paper an efficient high step-up converter with a coupled- inductor with soft- switching operation is presented. The proposed topology includes a coupled-inductor boost converter for raising the voltage gain. Moreover, a simple auxiliary resonant circuit composed of an auxiliary switch, a clamping diode and a resonant tank (inductor, capacitor), is adopted in this paper. The coupled-indu...

Integrated all-optical switches [I] can be of great importance for optical transparent telecommunication network All-optical switching is based on the phase change of the light due to the intensity in nonlinear optical (NLO) materials The materials investigated up to now exhibit NLO coefficients which are still too low for realistic high speed devices performance at low optical power A possible...

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...

This paper proposes two new soft-switching transformerless converters with high voltage conversion ratio. These proposed converters achieve soft-switching each with a single auxiliary resonant cell. The merit of these converters is reduced switching losses with lesser number of devices. The main switching devices are turned off with zero current switching (ZCS). Apart from the soft-switching fe...

In this paper, we have proposed, analyzed, and verified the performance of an optimized plasmonic 10-dB directional coupler a 3-dB in 2-D waveguides using finite-difference-time-domain (FDTD) method. A are based on metal–insulator-metal (MIM) slab waveguide analyzed at telecommunication wavelength (?) 1550 nm. Here, coupling transmission characteristics with separation distance between two para...

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...