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doi: 10.1177/003754977201900202pmid: N/A
This proposal suggests a novel and different system for fast on-line solution of the differential equa tions or difference equations describing a dynamical system (aerospace vehicle, ship, plant, physiologi caZ system, social/economic system, etc.). In an earlier study sponsored by the National Science Foundation, we have demonstrated beyond doubt that on-line, interactive, and scale-factor-free aZZ digital simulation, with a graphic solution display, is far more convenient than analog-hybrid computa tion. We now propose a simple multiprocessor system employing parallel operation of several inexpensive, standard, unmodified, minicomputers for faster on- line simulation at a cost dramatically lower than with conventional digital computers. The essential hardware features of the proposed system will be found in Section 2 of Part III and in Figure 3.Minicomputers specifically suitable for such multi processing are now mass-produced for a very large nonsimulation market; the proposed use of such commercially available components is a significant feature of our system, which will also draw on our laboratory's five years' experience with simulation software and display design.
doi: 10.1177/003754977201900204pmid: N/A
This paper presents the results of a survey of hybrid computer laboratories in the United States and abroad. The survey included personal visits to 15 hybrid computer laboratories and a mailing of 195 questionnaires. The survey questionnaire was design ed to determine the current status of hybrid computer facility configurations, management policies, and facility utilization levels.
doi: 10.1177/003754977201900207pmid: N/A
The short-range hydrothermal power scheduling problem is set as a problem in optimal control theory. New methods of modeling the upper- and lower-bound con straints on the reservoir capacity are proposed. The general equations that the optimal control satisfies are derived in the form of a constrained 2-point boundary-value problem (TPBVP). Properties of the optimal water usage policy are derived analytically and verified by simulation using the System 360 Continuous Systems Modeling Program.
doi: 10.1177/003754977201900208pmid: N/A
The computing elements for nonlinear operations presented in this paper are a combination of analog and digital components which combine the advantages of both techniques: large bandwidth and continuous representation of variables provided by analog techniques with accuracy and stability provided by digital techniques. The basic principle underlying these elements is to approximate functions by an appropriate power series, leading to a segmentation technique in which break-point values are calculated at high accuracy by operational digital-to-analog converters, while an interpolating increment is generated by medium-precision analog components.A whole family of high-precision multipliers, dividers, resolvers, and digitally settable function generators based on this principle will be described, as will the standard modules of which these computing elements are composed. Measured accuracies and bandwidths will be given. The new devices have good thermal stability.
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