A Context-aware Security Framework for Next Generation Mobile Networks

The openness and heterogeneity of next generation communication networks are now highlighting more security issues than those of traditional communication environments. Moreover users’ security requirements can often change in mobile communication environments, depending on the situation in which the user is immersed. Our objective is to define a context-aware security framework for addressing the problems of end-to-end security on behalf of end-users. Based on context data acquisition and aggregation features, the framework uses contextual graphs to define security policies encompassing actions at different layers of communication systems’ architecture, while adapting to changing circumstances

Modelling metal-halide lamps with plasimo

After a general introduction of the plasma simulation model Plasimo, being developed at Eindhoven University of Technology, we will discuss its application to the modelling of metal-halide lamps. The underlying model is based on a quite complete description of the plasma. It involves non-equilibrium plasma chemistry, the barycentric flow field, the gas temperature, spectrally and spatially resolved radiation transport and the electro-magnetic field. Special attention will be paid to the elemental diffusion sub-model, a non-equilibrium description of the plasma composition that is able to reproduce the process of elemental de-mixing. This convection-driven phenomenon is responsible for axial inhomogeneities in light output. This effect has been studied under various gravity conditions both on earth and in the International Space Station (ISS). A comparison with these experiments will be made. Plasimo (including the source code) is in principle available for fellow researchers. Interested parties are invited to contact the author or visit the Plasimo website, http://www.dischargemodelling.org

Colour segregation in metal-halide lamps: experimental and numerical investigations

The COST ref. lamp is a High Intensity Discharge (HID) Metal-Halide (MH) lamp that has been designed to introduce a unified lamp system used in exptl. investigations and numerical simulations done by various groups working on HID lamps. By using this lamp, designed to be accessible for a variety of diagnostic techniques, measurements of various plasma parameters can be fitted together to obtain a more complete understanding of the physics of these lamps. In this paper we discuss the mechanisms responsible for color segregation in MH lamps. The discussion is aided by exptl. and numerical data obtained from studies of the COST lamp: emission spectroscopy under varying gravity conditions, x-ray induced fluorescence and numerical modeling by means of the two-dimensional fluid model toolkit Plasimo. [on SciFinder (R)

Introductory course on Computational Plasma Physics

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Introductory course on Computational Plasma Physics

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Systematic numerical modelling of industrial plasma using PLASIMO

In recent years the plasma simulation model Plasimo (http://plasimo.phys.tue.nl), has been developed at Eindhoven University of Technology. Initially intended as a program dedicated to the modelling of thermal argon ICP's, it has developed into a fully-fledged code capable of handling a variety of equilibrium and non-equilibrium plasmas. In this contribution we shall give an overview of the design and capabilities of Plasimo, and discuss the plasma sources to which it has been applied. A demonstration will be given of the application of Plasimo to light sources. We conclude with a discussion of present and future plan