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A Director of Operations manages limited resources to service the different requirements that the organization has Depending on the quality of management (and resources) waiting time (customer, product and resources) will be higher or lower. From that point of view one could say that the function of a Director of Operations is to decide who or queue management system what must wait (Or whom). We've all experienced at one time the feeling of being lost time to wait in a queue. The phenomenon seems natural to us queues: We waited in the car to be in a plug, or a stoplight poorly regulated, or in a Toll; we expect the phone to heed us an operator and tail of a supermarket to pay.... But sometimes the expectations are good.

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We do see the importance of product or service that will acquire, allow us to think and reconfigure our request. But overall as customers want not wait, managers said services do not want to wait.... Why should we wait? How many there are to wait? The answer is almost always simple, at some points service capacity has been (or is) less than the capacity demanded. This limitation can be remove investing in items that increase capacity. In these cases the question is: Compensates invest in machines? Or do we invest in rooms wait? In that case, how big? Queuing theory attempts to go to answer these questions using methods analytical mathematicians.

Theory of tail. Description of a queuing system A queuing system can be described as follows. A set of "customers" reaches a system looking for a service, expect if this is not immediate, and They leave the system after they have been treated. You can in some cases admit that customers leave the system if they get tired of waiting. The term "client" is used in a general sense and does not imply that it is a being human parts can mean waiting their turn to be processed or work list waiting to print to a network printer. As the pattern of arrivals pattern can be service, varying with queue management system price elapsed time.. Queue Discipline The queue discipline is the way customers are sorted in the time to be served from the tail.

The first application of which queue management the news is the Danish mathematician Erlang on talks telephone in , for calculating size of switchboards. Then he became in a theoretical concept that got a great development, and for some years It is again talk of a concept applied but requires major work of analysis to convert the formulas into reality, or vice versa.. Characteristics of queuing systems Six is the basic features that should be used to describe suitably a queuing system: a) Pattern clients arrival b) pattern Servers Service c) Discipline tail d) System Capacity e) Number of service channels f) Number of stages of service customers leave customers coming customers served.

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Pattern arrival of customers In normal situations tail arrival is stochastic, in random arrival depends on a certain variable, in this case need to know the probability distribution between two successive arrival's client. Furthermore, would Keep in mind if customers arrive independently or simultaneously. In the latter case (in if they lots) distribution should be defined Probabilistic thereof. It is also possible that customers are "impatient". That is, they reach and if the tail is too long to leave, or queue management system price after waiting a long time in the queue They decide to leave. Theory of tails Page of Some authors include a feature which is the seventh population prospects.

Finally, it is possible that the pattern of arrival varies with time. Whether We call stationary kept constant, if for example varies with hours day is non-stationary.. Patterns Servers Service Servers can have a variable time service, in which case there to associate, to define a probability function. They can also attend in batches or individually. The service time may also vary with the number of customers in the queue, working faster or slower, and in this case is called service patterns dependent. A basic system queue Although most of the systems can be represented as in Figure, it should be clear that a detailed representation requires defining many parameters and functions. Queuing theory was originally a practical work.