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In an integrated telecommunications network, voice and data traffic compete for the same transmission facilities. Assuming Poisson arrivals and exponential service with different rates, analytic expressions are obtained for measures of performance such as blocking probability and average delay under the following operating rule: class 1 traffic behaves as a loss system while class 2 traffic is buffered when all channels are busy. In view of the inordinate amount of computational effort needed when the number of channels is large, simple approximations have been suggested. 相似文献
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In the study of complex queueing systems, analysis techniques aimed al providing exact solutions become ineffective. Approximation techniques provide an attractive alternative in such cases. This paper gives an overview of different types of approximation techniques available in the literature and points out their relative merits. Also, the need for proper validation procedures of approximation techniques is emphasized. 相似文献
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Martin Rupiya 《African Security Review》2013,22(4):128-138
This paper is a summary of some of the key findings of an eighteen-month MilAIDS research project that focused on how militaries in the Southern African countries of Botswana, Swaziland, Tanzania, Zambia and Zimbabwe had coped with the impact of the HIV epidemic since it had been identified amongst the ranks in the 1980s. As a result, there is a single major source for citation, which is ‘The enemy within: Southern African militaries' quarter-century battle with HIV and AIDS’. The summary does, however, contain other information related to developments that have emerged since the completion of the larger study, bringing us up to date with the contemporary discourse in the field. The purpose of highlighting some of the elements in the larger study is twofold: to distil its main findings for easier consumption and to draw our attention to salient factors that are considered worthy of replication. A second objective of this brief paper is of course to whet readers' appetite to read the more detailed work referred to above. 相似文献