Training generational differences

Two crossed polarizers are frequently used to inspect transparent materials placed between them for optical activity, either for birefringence or for optical rotary effects. Birefringence effects are produced by materials with a regular ordered structure that allows light to pass through at one orientation at a higher velocity than at another orientation. As a result of this, the two wave trains generated by the different velocities... 

The flowchart given earlier in Fig. 40.1 also provided a sketch of the different steps involved in the generation of multidirectional seas. As it can be seen from that figure, the synthesis part of the target wave train is different for generation of unidirectional and multidirectional seas, while the generation component through the wave machine is similar. Wave analysis will of course be different for the two cases. 

The simulator models the FCCU, generating output from 110 sensors every 20 seconds. In all, 13 different malfunction situations were simulated and are available for analysis. There are two scenarios for each malfunction, slow and fast ramp. Table II provides a list and brief description of each malfunction. A typical training scenario for any fast ramp malfunction simulation had the landmarks listed in Table III. Similarly, a typical training scenario for any slow ramp malfunction simulation is shown in Table IV. For both the fast and slow ramp scenarios, there was data corresponding to 10 min of steady-state behavior prior to onset of the faulty situations. 

With the introduction of a hidden layer, training becomes trickier because, although the target responses for the output nodes are still available from the database of sample patterns, there are no target values in the database for hidden nodes. Unless we know what output a hidden node should be generating, it is not possible to adjust the weights of the connections into it in order to reduce the difference between the required output and that which is actually delivered. 

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