Timely dissemination of required state information poses a significant challenge\r\nin the design of distributed sensor/actuator network-based control systems. In this paper,\r\ndistance sensitivity properties inherent in many sensor-actuator network-based control\r\nsystems are exploited to establish conditions under which information within a bounded\r\nlocality of each controller closely approximates optimal control based on knowledge of\r\nsystem-wide state information. By doing so, it is shown that optimal control in extremely\r\nlarge-scale distributed control systems can be achieved in O(1) time using information only\r\nwithin a fixed neighborhood around each controller, the size of which depends on the decay\r\ncharacteristics of the actuator influence matrix.
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