By Aitor Goti (Ed.)
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Provided that engineering flexibility can in all probability supply a aggressive virtue, the query then turns into: accurately how beneficial is that this flexibility? even if, conventional tools usually fail to thoroughly seize the industrial price of investments in an atmosphere of frequent uncertainty and quick swap.
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Extra resources for Discrete Event Simulations
T ha t is to say, instead of going straight from the original problem to its solution (Fig. l ) , which may be tedious and unrevealing of basic facts, the experimenter uses the indirect approach of a mathematical model (Fig. 2). T h e idea behind this “transformation” is not new. he Originol e e 59 Esto blishing approximations and evoluotinq results Mathematical Model Simplified System FIG. 2 T h e design engineer uses it in his everyday work from the analysis of servomechanism to the simple case of the logarithm and of its inverse, the antilogarithm.
T h e whole of the royal family together with the families of the nobles were led into captivity during the destruction of Elam. This took more than a month, and over the ruins of the city Ashurbanipal ordered salt to be scattered and weeds to be sown. Silent for ever were the sounds of happy people, the cries of joy, the tread of houshold animals; the city site was the home of wild asses, gazelles and beasts of the plain. Ashurbanipal recovered the statue of the goddess Nana, who had remained in Elam for 1635 years, a place which he regarded as ‘not fitting for her’ and who was awaitingthe coming of Ashurbanipal, which she had appointed, proclaiming that the king ‘would lead her forth from this miserable Elam and would bring her to the temple E-anna’, .
Such is the case with certain mathematical media employed in simulation problems which make it necessary to oversimplify complex real life situations. T o these limitations might be added a certain human tendency to either overdetermine or underdetermine criteria. , specifying “most efficient system” or “lowest cost system”). , fail to consider how the attractiveness of alternatives changes with time). T h e criteria to be used in experimentation must not ignore uncertainty, and they should take into account the effects of operations other than the one being studied.