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DARPA ULTRALOG Final Report - Industrial and Manufacturing ...

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Manuscript for IEEE Transactions on Automatic Control 22<br />

can say that AC-S is a robust policy to keep the system from behaving divergently <strong>and</strong> degrading<br />

performance significantly as have shown in the previous stability analysis.<br />

Table 4. Experimental results<br />

Control Policy<br />

FL FH AC-N AC-S<br />

Condition T V QoS T V QoS T V QoS T V QoS<br />

Con1 1656 13558 6934 6313 30643 5391 1663 22898 16245 1656 22884 16259<br />

Con2 1652 13547 6942 6302 30643 5435 1723 22982 16089 1728 22959 16046<br />

Con3 1656 13558 6934 6313 30643 5391 1966 23401 15539 1965 23403 15542<br />

Con4 1652 13547 6942 6371 30643 5159 2024 23495 15401 2007 23406 15376<br />

T: Completion time, V: Value of solution<br />

Fig. 9 shows the behavior of T * under adaptive control policies in unstressed environments. In<br />

the deterministic environment the system behaves stable under AC-S while diverging under AC-<br />

N. But, it is not valid in the stochastic environment because the system seems more stable under<br />

AC-N. This might explain partially why AC-S does not perform better in stochastic<br />

environments.<br />

1720<br />

1710<br />

Optimal T<br />

1700<br />

1690<br />

1680<br />

1670<br />

1660<br />

1650<br />

AC-S (Con2)<br />

AC-N (Con2)<br />

AC-S (Con1)<br />

AC-N (Con1)<br />

1640<br />

0 200 400 600 800 1000 1200 1400 1600 1800<br />

Time<br />

Fig. 9. Behavior of T * in unstressed environments

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