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The service that the server gives to the aircraft would be hospital queue system constituted by the landing itself. For example, could be taken as the instant of time at which the aircraft begins to be “served” as the instant in which it passes over the outer marker. The queue of aircraft waiting to land would be formed by the aircraft that are flying in the different circuits of expected to have set the airport. Figure shows schematically the system and its parts, as well as the correspondence between these and the generic system. The goal of teaching him the subject hospital queue management system matter of queues is to achieve understanding on the part of the student of the concepts described above and to give to those of the techniques and methods needed to describe the evolution of the system. This is characterized by a set of variables that are in principle The number of customers in the system. The number of customers in the queue.

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the time of permanence of each client in the system. the waiting time of each customer in the queue. The simplest case that occurs is one in which the system is in state stationary, so that the average values of the descriptive variables depends on the time or the client considered. For this kind of situations the “Theory of Queues” provides a body of very hospital queue management system comprehensive knowledge that allows you to describe many systems. The book of Gross, and others may serve as a text reference to queuing Theory. Unfortunately, in many real cases, the system is not at steady state so that a description of the same using the results in the stationary is completely incorrect and can lead to severe errors. In general a very important source of lack of stationary is due to the process of arrivals of customers to the system.

This, in general, is not stationary since the intensity of the arrivals strongly dependent on the instant of time considered. By example, in the case of landings of aircraft, the intensity of arrivals is see here very low beginning of the day and rises sharply from to reach its maximum value during the morning and part of the afternoon. It is, therefore, a serious error to use the results of the Theory of Queues to cases of systems is clearly not stationary. In addition, it is important that the student learns to distinguish the real situations that can not be considered as stationary. In the case of non-stationary one possible approach to passes by to describe the evolution of the system by obtaining the number of customers from an instant of time initial up to the time instant in consideration have come to the system. This curve is called the “curve of arrivals cumulative” and is represented. Therefore, At is the number of customers that have arrived to the system from the initial point to the instant.

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Similarly, you can define the “curve outputs accumulated” by the number of customers that have abandoned the system from the initial point up to t. Finally, you can define the “curve outputs accumulated in the queue” by the number of customers that have abandoned the queue from the initial point up to t. Figure shows an example of a curve of arrivals accumulated along with the average curve of arrivals accumulated that would be obtained by averaging a very large number of realizations concrete. The sharpness of the curves accumulated is the one adopted in Hall patient queue management system for the analysis of the queues that appear in see more numerous situations of interest in the world of Engineering. Similarly, used this approach for queues that appear in the landing and takeoff operations. Finally, makes use of approach curves accumulated for analysis of the evolution of the traffic of vehicles in certain situations. The books mentioned above are the texts of reference used by the author to the teaching of Engineering and Transport Exploitation of Air Transport.