Discrete event simulation of computer networks has significant scalability issues, which makes simulating large scale networks problematic. We propose to extend the approach by combining it with analytical models for network clouds, which are much more efficient, if less accurate, than nodeby-node models. Thus, simulation scenarios containing several ISP networks become feasible. We introduce a...

A self-timed ring using NULL convention logic (NCL) is presented. An analytical method to evaluate the speed of NCL rings has been developed. The analytical predictions are verified by a Synopsys simulation and excellent agreement between the theoretical predictions and simulation results is obtained. Some important principles for ring optimisation are obtained. The analysis leads to the speed ...

Computer aided design and computer aided modeling tools are becoming increasingly important in the design and performance evaluation of communication systems. In this work, we report on the computer simulation modeling study of terrestrial digital microwave radio transmission, using Block Oriented System Simulator package (BOSS). The work concentrates on semi-analytical error rate evaluation in...

Hydrothermal convection of pore water with a temperature-dependent viscosity within a permeable, internally heated, moderately thin spherical shell is investigated by both a perturbation analysis and a direct numerical simulation. The analysis and simulation are mainly focused on a thin spherical shell in that convective instabilities are characterized by the spherical harmonic degree l=6 with ...

This paper addresses the problem of multicast (i.e., mul-tipoint) routing in computer networks carrying a mix of uni-cast and multicast traac. In particular, we derive a closed form mathematical expression to predict the average link usage for multicast calls in a two-dimensional rectangular mesh network. The analytical expression is used to evaluate the relative performance of three simple mul...

The Sesame system-level simulation framework targets efficient design space exploration of embedded multimedia systems. Even despite Sesame’s efficiency, it would fail to explore large parts of the design space simply because system-level simulation is too slow for this. Therefore, Sesame uses analytical performance models to provide steering to the system-level simulation, guiding it toward pr...