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                  <mods:namePart>Atencia-McKillop, Iván</mods:namePart>
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                  <mods:namePart>Merino-Córdoba, Salvador</mods:namePart>
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                  <mods:namePart>Guzmán-Navarro, Francisco</mods:namePart>
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                  <mods:namePart>Fortes-Ruiz, Inmaculada</mods:namePart>
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               <mods:name>
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                  <mods:namePart>Sánchez, Sixto</mods:namePart>
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                  <mods:dateAccessioned encoding="iso8601">2016-07-29T10:33:29Z</mods:dateAccessioned>
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               <mods:identifier type="uri">http://hdl.handle.net/10630/11921</mods:identifier>
               <mods:identifier type="orcid">http://orcid.org/0000-0002-4366-8241</mods:identifier>
               <mods:abstract>Queueing systems constitute a central tool in modeling and performance analysis. These&#xd;
types of systems are in our everyday life activities, and the theory of queueing systems was&#xd;
developed to provide models for forecasting behaviors of systems subject to random demand.&#xd;
The practical and useful applications of the discrete-time queues make the researchers to con-&#xd;
tinue making an e ort in analyzing this type of models. Thus the present contribution relates&#xd;
to a discrete-time Geo/G/1 queue in which some messages may need a second service time&#xd;
in addition to the  rst essential service. In day-to-day life, there are numerous examples of&#xd;
queueing situations in general, for example, in manufacturing processes, telecommunication,&#xd;
home automation, etc, but in this paper a particular application is the use of video surveil-&#xd;
lance with intrusion recognition where all the arriving messages require the main service and&#xd;
only some may require the subsidiary service provided by the server with di erent types of&#xd;
strategies.&#xd;
We carry out a thorough study of the model, deriving analytical results for the stationary&#xd;
distribution. The generating functions of the number of messages in the queue and in the&#xd;
system are obtained. The generating functions of the busy period as well as the sojourn times&#xd;
of a message in the server, the queue and the system are also provided.</mods:abstract>
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               <mods:subject>
                  <mods:topic>Colas de espera, Teoría de</mods:topic>
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               <mods:titleInfo>
                  <mods:title>A discrete-time queueing system with feedback and optional service</mods:title>
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               <mods:genre>conference output</mods:genre>
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