摘要:

The synchronization of a digital communication network of general structure by the method of discrete-control-correction is investigated. In this method, periodic corrections are made to the frequencies of the local clocks, according to changes in the local buffer-levels. Conditions under which synchronization is achieved are derived, and the frequency of synchronism and the steady-state buffer levels are calculated.

ISSN:0020-7721    

DOI:10.1080/00207727408920165

出版商:Taylor & Francis Group    

年代:1974

数据来源: Taylor

摘要:

A formulation and some properties of the (Lagrangian) dual of the dual of a mathematical programming problem were presented in an article by Unger and Hurter (1972). Here, that formulation is simplified, so that the resulting form is more closely related to the primal. In particular, the dual of the dual is shown to be merely the primal, except that the objective function and each constraint are replaced by their first-order Taylor series approximation.

ISSN:0020-7721    

DOI:10.1080/00207727408920166

出版商:Taylor & Francis Group    

年代:1974

数据来源: Taylor

摘要:

This paper presents a method of maximizing reliability of a series system subject to multiple constraints. The use of both active series parallel and standby redundancy is considered to increase the reliability of the system. A flexible tree search method has been used in this paper which is found to be an efficient method of solution, as it requires only simple mathematical computations. A three stage system is used for illustration.

ISSN:0020-7721    

DOI:10.1080/00207727408920167

出版商:Taylor & Francis Group    

年代:1974

数据来源: Taylor

摘要:

The Nyquist plot of a single variate transfer function provides the motivation for a graphical technique relevant to linear and non-linear operators on a Hilbert space. The graphical method is developed so as to retain the geometrical interpretation and physical insight which characterizes the conventional Nyquist plot. The extended Nyquist plot is then utilized to analyze selected system sensitivity problems in the Hilbert space setting.

ISSN:0020-7721    

DOI:10.1080/00207727408920168

出版商:Taylor & Francis Group    

年代:1974

数据来源: Taylor

摘要:

In this paper, simple matricial methods are used to develop a basis for the design of multivariable continuous-time tracking systems which are generalized versions of classical single-input single-output servomechanisms.

ISSN:0020-7721    

DOI:10.1080/00207727408920169

出版商:Taylor & Francis Group    

年代:1974

数据来源: Taylor

摘要:

In this paper (vector valued) bandlimited functions have been used as the class of admissible controls. Essential properties of the class of admissible controls are developed. Properties of attainable sets and the set of trajectories of the dynamical system under consideration are presented. These results are proved without the convexity condition usually imposed on the ‘ velocity field ’ of the dynamical system. In the final section several interesting optimal control problems are solved using the compactness properties of attainable sots and admissible trajectories.

ISSN:0020-7721    

DOI:10.1080/00207727408920170

出版商:Taylor & Francis Group    

年代:1974

数据来源: Taylor

摘要:

This paper considers the relation which exists between the first and second methods of Lyapunov. As a result of this study a useful nth order generating technique for Lyapunov functions is developed which applies to linear and nonlinear systems. The function obtained has a negative definite time derivative so that regions of asymptotic stability or instability can be determined. The function is derived from the equations of the system and the curl relations. The final result requires the calculation of single and inverse coefficients using recursive formulae. The basic method for generating Lyapunov functions makes use of the first method of Lyapunov. It is then extended to systems where the first method fails, to variations which have proved useful, and to more general and, hence, more complex forms. Two theorems are proved and examples are given in each section to illustrate the method presented.

ISSN:0020-7721    

DOI:10.1080/00207727408920171

出版商:Taylor & Francis Group    

年代:1974

数据来源: Taylor

摘要:

This paper describes application of a recent result in control system sensitivity reduction to economic policy modification for macroeconomic systems. A two-sector Phillips multiplier model is used as an example. By an appropriate reapportionment of non-feedback and feedback terms in the government policies in each sector, it is shown that the sensitivity with respect to model parameter variations of national income is reduced. This reduction is accomplished without changing the values of the sector state variables of the macroeconomic system when the parameters have nominal values. When the original policy leads to an optimal system, so does the modified policy. Furthermore, the modified policy always leads to a stable economy.

ISSN:0020-7721    

DOI:10.1080/00207727408920172

出版商:Taylor & Francis Group    

年代:1974

数据来源: Taylor