Journal ArticleDOI
Time separation technique for large databases
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A time decomposition technique is suggested for large-database (DB) models and the problem of network aggregation is studied and the results used to create a meaningful decomposed model are studied.Abstract:
A time decomposition technique is suggested for large-database (DB) models. The problem of network aggregation is studied and the results used to create a meaningful decomposed model. Decomposition conditions and assumptions are discussed and illustrated by examples. A practical operating schedule is presented for the time-separated DB model. The schedule uses a sequence of decomposed models, which are to be constructed recursively. The application of the time separation technique for large-DB models is presented in the form of a closed-loop algorithm. The problem of decomposition stability with respect to variations in time constants is considered as well. Two alternative approaches to the problem are suggested. For a probabilistic approach, practical approximate formulas are obtained for subsystem time constants and recommendations are made with respect to the decomposition structure. An approximate performance analysis is done for both standard and time-decomposed models. A comparison of the results is given.read more
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Frequency Separation Analysis for Object Oriented Databases
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Journal ArticleDOI
Frequency decomposition technique for large archivable databases
TL;DR: An adaptive procedure is presented that controls growth and dynamic restructuring of the decomposed structure of the frequency decomposition pattern and provides a flexible and economical way of achieving a needed degree of database recoverability and archivability.
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Survey of decentralized control methods for large scale systems
TL;DR: In this article, the authors survey the control theoretic literature on decentralized and hierarchical control, and methods of analysis of large scale systems, and present a survey of the control theory of large-scale systems.
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Control of large-scale dynamic systems by aggregation
TL;DR: Using the quantitative definition of weak coupling proposed by Milne, a suboptimal control policy for the weakly coupled system is derived and questions of performance degradation and of stability of such suboptimally controlled systems are answered.
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