Several analytical models of fully-adaptive routing have recently been proposed for wormhole-routed k-ary ncubes under the uniform traffic pattern. However, there has been hardly any model reported yet that deals with other important non-uniform traffic patterns, such as hot spots. As a result, most studies have resorted to simulation when evaluating the performance merits of adaptive routing. ...

This paper provides a performance evaluation of the TETRAPOL random access protocol. The results are based on a Markovian model which is also presented. The Markovian model is used to derive quality of service parameters, e.g. mean throughput, waiting probability, and mean random access delay. The analytical results are compared to results based on stochastic simulation. Our prototypic implemen...

We investigate the impact of First-In-First-Out (FIFO) flow aggregation on delay performance of a Differentiated Services (DiffServ) network in the context of Expedited Forwarding (EF). Specifically, the focus is on investigating the impact of FIFO aggregation on edge-toedge delay performance. Motivated by the IST Moby Dick project, the investigation is mainly conducted through simulation. On t...

This paper analyzes the probabilities of data packet loss for both an encrypted channel in self-synchronous cipher feedback mode and a nonencrypted channel, in the space data systems. Simulation results show reasonable agreement with analytical results. When channel bit error probability is lo-' and the total number of packets per frame is 3, the analytical model gives 0.39% packet loss while t...

Reliability assessment and risk analysis of rotating machine rotors in various overload and malfunction situations present challenge to engineers and operators. In this paper a new analytical method for evaluation of rotor under large deformation is addressed. Model is presented in general form to include also composite rotors. Presented simulation procedure is based on variational work method ...

The purpose of this paper is to validate and test the adequacy of an analytical expression to calculate proper safety stock levels using simulation techniques. The model refers to a periodic review system and a lot-4-lot replenishment policy, with randomness in forecast errors and in order fulfillment. The simulation model is formulated in a spreadsheet environment using MS Excel and @Risk. The...

As the stipulate for wireless communication has been mounting hurriedly, resourceful management of radio spectrum becomes very imperative. Channels are derisory and hence must be utilized inventively. In this paper, a evaluation of Fixed Channel allocation and Dynamic Channel Allocation is evaluated using analytical and simulation model in 25 cell system for GSM 1800. A suitable analytical mode...

The article is an attempt to answer the question if it makes sense to modify the way of choosing packets to reject in AQM mechanisms. Simulation and analytical research of RED and DSRED mechanisms shows that their efficiency grows when packet is received from the front of the queue. It is especially conspicuous when taking into account the self-similarity of traffic. However implementation of t...

When running an analytical liquid rate simulation on a bounded reservoir an artefact due to Laplace transform numerical inversion algorithm can be noticed. This issue can be illustrated with a simple example: liquid rate simulation on a closed circular homogeneous reservoir with a fracture. The details of the simulation are graphically given in Figure 1(a). The simulation results can be seen in...

Techniques based on discrete-event simulation have been widely used for network analysis and policy optimization in the domain of supply chain management. Previous researchers have developed and implemented architectures for simulation-based control for shop floor. A more detailed and high-fidelity simulation model is used for control purposes as opposed to that used for analytical purposes alo...