918 resultados para Bulk service queue with vacations to the server
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Mode of access: Internet.
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Without music.
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Mode of access: Internet.
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Published later (1894) under title: Spies, traitors and conspirators of the late Civil War.
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Mode of access: Internet.
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Mode of access: Internet.
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"B-275942"--P. 1.
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Queueing systems constitute a central tool in modeling and performance analysis. These types of systems are in our everyday life activities, and the theory of queueing systems was developed to provide models for forecasting behaviors of systems subject to random demand. The practical and useful applications of the discrete-time queues make the researchers to con- tinue making an e ort in analyzing this type of models. Thus the present contribution relates to a discrete-time Geo/G/1 queue in which some messages may need a second service time in addition to the rst essential service. In day-to-day life, there are numerous examples of queueing situations in general, for example, in manufacturing processes, telecommunication, home automation, etc, but in this paper a particular application is the use of video surveil- lance with intrusion recognition where all the arriving messages require the main service and only some may require the subsidiary service provided by the server with di erent types of strategies. We carry out a thorough study of the model, deriving analytical results for the stationary distribution. The generating functions of the number of messages in the queue and in the system are obtained. The generating functions of the busy period as well as the sojourn times of a message in the server, the queue and the system are also provided.
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We use a probing strategy to estimate the time dependent traffic intensity in an Mt/Gt/1 queue, where the arrival rate and the general service-time distribution change from one time interval to another, and derive statistical properties of the proposed estimator. We present a method to detect a switch from a stationary interval to another using a sequence of probes to improve the estimation. At the end, we compare our results with two estimators proposed in the literature for the M/G/1 queue.
HIV infection among women admitted to the gynaecology service of a district hospital in South Africa
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Our objective was to determine the prevalence of HIV infection and disease-specific HIV prevalence among women admitted to the gynaecology service of a district hospital in South Africa over a 3-month period in 1997. This was done with the goal of developing HIV education and counselling services in this setting. HIV status was determined among 196 (96%) of 205 consecutive admissions; 82 (42%) tested HIV positive. The HIV-infected women were younger than the HIV uninfected women (mean age 27 vs 33 years, P=0.001). The disease-specific HIV prevalence was greater than or equal to 40% among women who had had abortions, pelvic inflammatory disease, or ectopic pregnancy. The length of hospital stay (mean 5.4 days) and mortality (1%) were similar in the 2 groups. Inpatient gynaecology services may be act important setting in Africa, within which to provide HIV education, counselling and care.