The reliability of a real-time digital control system depends not only on the reliability of the hardware and software used, but also on the speed in executing control algorithms. The latter is due to the negative eff...
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The reliability of a real-time digital control system depends not only on the reliability of the hardware and software used, but also on the speed in executing control algorithms. The latter is due to the negative effects of computingtime delay on control system performance. For a given sampling interval, the effects of computingtime delay are classified into the delay problem and the loss problem. Analysis of these two problems is presented as a means of evaluating real-time control systems. As an example, both the self-tuning predicted (STP) control and Proportional-Integral-Derivative (PID) control are applied to the problem of tracking robot trajectories, and their respective effects of computingtime delay on control performance are comparatively evaluated. For this exmple, the STP (PID) controller is shown to outperform the PID (STP) controller in coping with the delay (loss) problem.
Three factors determine the optimum configuration of a multiprocessor at any epoch: the workload, the reward structure, and the state of the computer system. An algorithm is presented for the optimal (more realistical...
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Three factors determine the optimum configuration of a multiprocessor at any epoch: the workload, the reward structure, and the state of the computer system. An algorithm is presented for the optimal (more realistically, quasi-optimal) configuration of such systems used in real-time applications with periodic reward rates and workloads. The algorithm is based on Markov decision theory. It is suggested that a change in the workload or the reward structure should be as powerful a motivation for reconfiguration as component failure. Such changes occur naturally over the course of operation: an example of an online transaction processing system with a workload and reward structure that has a period of a day is given.< >
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