On coupling multi-systems through data sharing

Article Abstract:

Growth in the use of multiprocessor-based database systems results from the demand for higher transaction rates. In a locally distributed system, coupling through multi-system data sharing may be used to increase system access to data. A hierarchical modeling technique is used to develop parameters for event-driven simulation models. Performance results are derived from these simulation models. The critical factor in determining coupling effectiveness is lock contention, and alternative lock designs which affect lock contention are available. Approximately six to 12 systems may be coupled effectively through data sharing, depending on lock design and system structure.

Growth (Physiology), Databases, Online transaction processing, Database, Growth

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Computation of single-tone spurious effects in radio communication systems

Article Abstract:

A new semiempirical computational technique is developed for determining the magnitudes and-or frequencies of potential single-tone spurious RFI events in radio communications systems. Such events are the most common form of radio interference. The technique is useful for improving immunity from RFI interference during the early design and development state of communications system. Development and validation of the technique is described.

Systems analysis, Product introduction, Performance improvement (Computers), System Design, Applications, Optimization, New Technique, Performance Improvement, technical, Radio Frequency Interference

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A Time-Varying Difference Equation for Nonperiodic Sampling Systems

Article Abstract:

Nonperiodic discrete-continuous sampling systems can be modeled in time domain. For constant sampling problems z-transforms are used to study discrete systems. A new method for modeling nonperiodic sampling systems is described. It involves input-output measurements only. A table lists time-varying parameters of a numerical example.

Mathematical models, Statistics (Data), Tests, Models, Performance Measurement, Testing, Systems, Statistics, Sampling, Sampling Error, Theory, Theoretical Approach, letter to the editor

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