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DEMOS - a system for discrete event modelling on Simula.

Publisher: Macmillan, ISBN: 978-0-333-23881-3
Source: DBLP
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Available from: Graham Birtwistle, Aug 01, 2014
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    • "The simulator was built using the process oriented Simula [23] programming language and the Discrete Event Modeling On Simula (DEMOS) context class [24]. This programming language is considered as one of the first object oriented programming languages, and remains a strong tool for performing simulations. "
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    ABSTRACT: This paper presents an enhancement to a category of Adaptive Video Streaming solutions aimed at improving both Quality of Service (QoS) and Quality of Experience (QoE). The specific solution used as baseline for the work is the Smooth Streaming framework from Microsoft. The presented enhancement relates to the rate adaptation scheme used, and suggests applying a stochastic or fixed/unique setting of the rate adjustment intervals rather than the default fixed/equal approach. The main novelty of the paper is the simultaneous study of both network oriented fairness in the QoS domain and perception based fairness from the QoE domain, when introducing the suggested mechanism. The method used for this study is by means of simulations, measurements and numerical optimization. Perception based fairness is suggested as an objective QoE metric which, requires no reference to original content. The results show that the suggested enhancement has potential of improving fairness in the QoS domain, while maintaining perception based fairness in the QoE domain
    Full-text · Article · Dec 2012 · International Journal on Advances in Networks and Services
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    • "The simulator was built using the process oriented Simula [20] programming language and the Discrete Event Modeling On Simula (DEMOS) context class [21]. This programming language is considered as one of the first object oriented programming languages, and remains a strong tool for performing simulations. "

    Full-text · Conference Paper · Jan 2012
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    • "A discrete event simulation program is used to quantify the performance of different reservation schemes. The program is implemented in SIMULA programming language using the DEMOS library [7]. The main parameters of the simulation scenarios are listed in table 1. "
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    ABSTRACT: Integrated hybrid optical packet/circuit switched architectures enable networks with the guaranteed service transport (GST) of circuit switching and the statistical multiplexing known from packet switching. The utilization of the optical lightpaths is increased by inserting low priority statistically multiplexed (SM) traffic in the guaranteed circuit switched traffic gaps. Previous studies of these nodes have used optical packet switches together with reservation techniques to minimize the SM packet losses while giving absolute priority to circuit switched traffic. In this paper we propose a novel scheduling technique that applies electronic buffers and multiple queues to find a suitable SM packet to fit in a GST gap. Additionally, two schemes of managing the output buffer are introduced, the dedicated queue per input and the length-aware buffering. Simulation results demonstrate that their combination significantly increases the utilization of the available capacity and the maximum rate of SM traffic inserted in the network.
    Full-text · Article · Jan 2012
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