摘要:

An original problem statement for the optimal control laws design is presented. A large scale system composed of M linear static subsystems with an interaction and quadratic performance index is considered. A two-level hierarchical control structure is assumed, in which a coordinator and local controllers have access to different information. The so-called elastic constraint (Gessing 1985) is used for coordination. For the problem the possibility of partial decomposition of calculations and a decentralization of the control, as well as an analytical form of the optimal laws are obtained. The influence of the particular subsystem on the control quality is investigated.

ISSN:0020-7721    

DOI:10.1080/00207729008910369

出版商:Taylor & Francis Group    

年代:1990

数据来源: Taylor

摘要:

A method for the computation of the transfer function for linear time-invariant singular SISO systems is presented. The system must be reduced to the Hessen-berg/triangular form, then the transfer function denominator and numerator are obtained by two simple formulae derived from the expression of the determinant of a Hessenberg matrix. The problem of computing a minimal representation by removing the input and output decoupling zeros via Hessenberg/triangular form is also considered. Unitary transformations are used and so the numerical stability is preserved. An extension to multivariable systems is proposed.

ISSN:0020-7721    

DOI:10.1080/00207729008910370

出版商:Taylor & Francis Group    

年代:1990

数据来源: Taylor

摘要:

The analytic hierarchy process (AHP) initialed by Saaty (1980) has recently been attracting attention as a useful support method for multi-objective decision making. This paper presents some useful theorems for the sensitivity analysis of priority that is playing an important role in the AHP. These theorems are derived from the principle of hierarchical composition which is expressed in the form of a reachability matrix. Using the theorems, we can easily calculate the degrees of effects caused by local or global changes in the priorities of some criteria, and also we can examine the possibility of rank reversal among alternatives. Furthermore, by applying these theorems to a dwelling selection problem, this paper verifies their effectiveness.

ISSN:0020-7721    

DOI:10.1080/00207729008910371

出版商:Taylor & Francis Group    

年代:1990

数据来源: Taylor

摘要:

Recent work by one of the authors has identified the average mutual information and the conditional entropy as two measures from information theory that are useful in quantifying the system organization and incoherence, respectively. While the scaled average mutual information, or network ascendency, is inherently symmetrical with respect to inputs and outputs, the scaled conditional entropy, or overhead, remains asymmetrical. Employing the joint entropy, instead of the conditional entropy, to characterize the overhead, results in a symmetrical overhead and also permits the decomposition of the system capacity, or complexity, into components useful in following the response of the whole system to perturbations.

ISSN:0020-7721    

DOI:10.1080/00207729008910372

出版商:Taylor & Francis Group    

年代:1990

数据来源: Taylor

摘要:

Over a decade ago, Leonard Kleinrock developed a model for selecting best–performance scheduling algorithms for computer systems. The M/G/I queuing system used by Kleinrock requires that an estimate of the service–time probability distribution function (p.d.f.) be made in order to derive results. While methods of fitting service–time data to p.d.f.s are available, this paper argues that the use of a generalized beta distribution of the second type (GB2) in concert with the Kleinrock model reduces the need to estimate alternative models and avoids the consequences of arbitrarily imposing invalid assumptions on the data.

ISSN:0020-7721    

DOI:10.1080/00207729008910373

出版商:Taylor & Francis Group    

年代:1990

数据来源: Taylor