Spam in Internet telephony (SPIT) networks is likely to become a large problem in the future, as more and more people and companies switch from traditional telephone networks to Voice over IP (VoIP) networks, and as it is easy to spam VoIP users. The goal of this survey paper is to identify techniques to prevent and reduce SPIT. To compare the various SPIT protection techniques, criteria will b...

The research project currently in progress aims to develop a comprehensive understanding of the children’s multimedia publishing industry in the UK and the challenges of adapting to change for publishers who have entered the multimedia market in the 1980s and 90s. The preliminary findings of research which includes a questionnaire and several case study interviews on UK publishers producing mul...

The paper describes a methodology used to analyze the editorial production of CNR Institutes belonging to the Department of Humanities and Social Sciences (HSS). This analysis is considered a pre-requisite to design a feasibility study to develop an e-publishing service tailored to HSS. To reach this aim the paper describes in particular the characteristics of currently published products defin...

A ZigBee based collision avoidance system for railways has been proposed in this paper. The Train Anti-Collision System (TACS) has four sub centers namely, Train Subsystem, Station/Control Center Subsystem, Signalling Post Subsystem and Level Crossing Subsystem. A safe distance of 1 Km has been given for braking between the trains in case of collision distance. Based on the studies, it has been...

The subject under study is an open subsystem of a larger linear and conservative system and the way in which it is coupled to the rest of system. Examples are a model of crystalline solid as a lattice of coupled oscillators with a finite piece constituting the subsystem, and an open system such as the Helmholtz resonator as a subsystem of a larger conservative oscillatory system. Taking the vie...

The subject under study is an open subsystem of a larger linear and conservative system and the way in which it is coupled to the rest of system. Examples are a model of crystalline solid as a lattice of coupled oscillators with a finite piece constituting the subsystem, and an open system such as the Helmholtz resonator as a subsystem of a larger conservative oscillatory system. Taking the vie...

ion of Context Constraints Parallel Composition The minimised LTS can be used for subsequent analysis of larger (sub)systems original system specification select Contextual Local Analysis a minimised composite LTS of the subsystem LTSs of processes in a system component LTSs in a subsystem A transparent Interface Process component LTSs in the context Figure 1-2: A Schematic Diagram of Contextua...

For classical lattice systems, the Dobrushin-Lanford-Ruelle theory of boundary conditions states that the restriction of a global equilibrium state to a subsystem can be obtained as an integral over equilibrium states of the subsystem alone. The Hamiltonians for the subsystem are obtained by fixing a configuration for the variables in the complement of the subsystem, or more generally, by evalu...

Proton exchange membrane fuel cells (PEMFCs) are one of the leading candidates in alternative energy conversion devices for transportation, stationary, and portable power generation applications. PEMFC systems with their own fuel conversion unit typically consist of several subsystems: a fuel processing subsystem, a fuel cell stack subsystem, a work recovery-air supply subsystem, and a power el...

In this paper, the trajectory tracking control problem of uncertain nonholonomic mechanical systems is investigated. By separately considering kinematic and dynamic models of a nonholonomic mechanical system, a new adaptive tracking control is proposed based on neural network approximation. The proposed design consists of two steps. First, the nonholonomic kinematic subsystem is transformed int...