Applications of Queueing Theory by G. F. Newell (auth.)

By G. F. Newell (auth.)

The literature on queueing idea is already very huge. It comprises greater than a dozen books and a few thousand papers dedicated completely to the topic; plus many different books on likelihood thought or operations study within which queueing idea is mentioned. regardless of this super job, queueing concept, as a device for research of functional difficulties, continues to be in a primitive nation; possibly regularly as the conception has been prompted in basic terms superficially by means of its power purposes. humans have committed nice efforts to fixing the 'wrong difficulties. ' Queueing conception originated as a really functional topic. a lot ofthe early paintings used to be prompted by way of difficulties pertaining to cellphone site visitors. Erlang, specifically, made many vital contributions to the topic within the early a part of this century. phone site visitors remained one of many precept functions until eventually approximately 1950. After global battle II, job within the fields of operations study and likelihood concept grew swiftly. Queueing thought turned very hot, relatively within the overdue Nineteen Fifties, yet its reputation didn't heart rather a lot round its purposes as round its mathematical points. With the refine­ ment of a few smart mathematical methods, it turned transparent that particular options might be came across for numerous mathematical difficulties linked to types of queueing phenomena. The literature grew from 'solutions searching for an issue' instead of from 'problems searching for a solution.

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13). 13) with new units. 5 Queueing to meet a scbedule In most models of queueing it is customary to imagine that the arrival pattern is given or observed and that it will not change if the service rate changes. t and the number of service completions shall not exceed the number of arrivals (an upper bound on D(t)). There are other situations, however, in which one might specify a lower bound on the number of service completions by time t and one wishes to minimize the number of service completions by time t subject to the same DETERMINISTIC FLUID APPROXIMATION 39 constraint that the service rate not exceed Jl and that the number of service completions stays above the lower bound.

Deterministic fluid approximations are particularly useful for a crude analysis of these types of situations. The queues may well become sufficiently large between service pulses to justify use of such approximations even though, over a long time period, the system is 'undersaturated' in the sense that the queue does not continue to grow from one cycle to the next. A typical graph of arrivals and departures for the above type of system is shown in Fig. 7. '!!. c .. 7 Arrivals and departures for pulsed service application, we let r i = red time of the ith cycle gi = green time of the ith cycle Ai = arrival rate during the ith cycle jL = service rate during green.

Note that the graphical construction of Dq(t) is very easy for any given p.. One merely pushes a straight edge at slope p. against the curve A(t) to form the tangent at to and draws the line from to until it meets A(t) again. One can see immediately from Fig. 3 (a) that, for any smooth A(t), Q(t) grows quadratically in time from time to but vanishes linearly in t near t3. (t) as in Fig. 3(b). (t) = l(t) ~ p.. (t) = p. ~ l(t) as shown by the broken line. If l(t) reaches a maximum at time t1 and decreases, it will equal p.

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