Showing papers on "Network planning and design published in 1970"
TL;DR: In this paper, the adjoint network approach due to Director and Rohrer for evaluating the gradient vector of suitable objective functions related to network responses that are to be opttilzed is presented in a tutorial manner.
Abstract: Some current trends in automated network design optimization which, it is believed, will play a significant role in the computer-aided design of lumped-distributed and microwave networks are reviewed and discussed. In particular, the adjoint network approach due to Director and Rohrer for evaluating the gradient vector of suitable objective functions related to network responses that are to be opttilzed is presented in a tutorial manner. The advantage of this method is the ease with which the required partial derivatives with respect to variable parameters, such as electrical quantities or geometrical dimensions, can be obtained using at most two network analyses. Least pth and minimax approximation in the frequency domain are considered. Networks consisting of linear time-invariant elements are treated, including the conventional lumped elements, transmission lines, RC limes, coaxial lines, rectangular waveguides, and coupled lines. To illustrate the application of the adjoint network method, an example is given concerning the optimization in the least pth sense using the Fletcher-Powell method of a transmission-line filter with frequency variable terminations previously considered by Carlin and Gupta.
59 citations
TL;DR: It is shown how the adjoint-network approach to automated design due to Director and Rohrer can be implemented in gradient calculations for least pth and minimax response objective functions.
Abstract: It is shown how the adjoint-network approach to automated design due to Director and Rohrer can be implemented in gradient calculations for least pth and minimax response objective functions. Their formulas, for example, for frequency-domain design of networks consisting of lumped, linear and time invariant elements may be used without change, provided that the adjoint network is appropriately excited.
6 citations
TL;DR: In this paper, the developments in hydraulic analysis from trial and error and Hardy Cross methods, to electric pipeline analyzer and digital computing methods, the evolution of methods for systems balance, and direct and optimum design of water distribution networks, are brought forth.
Abstract: The systematic design of a water distribution system network has so far been an exception rather than a routine matter due to the labor and time involved in the process. New methods that have come into vogue have relieved much of the time-consuming and tedious nature of the analysis. The developments in the hydraulic analysis from trial and error and Hardy Cross methods, to electric pipeline analyzer and digital computing methods, the evolution of methods for systems balance, and direct and optimum design of water distribution networks, are presented. The respective advantages and limitations of each method are brought forth. Studies of the various methods show that lacunae still exist in the systems analysis and optimal design of a water system network.
2 citations
TL;DR: Experience at Belgium's Nuclear Research Center shows that network planning techniques, with the aid of a computer, provide a comprehensive understanding of the total program, aid budgeting and ease the problem of project modifications.
Abstract: Experience at Belgium's Nuclear Research Center shows that network planning techniques, with the aid of a computer, provide a comprehensive understanding of the total program, aid budgeting and ease the problem of project modifications.
1 citations
TL;DR: Investigative and preliminary work undertaken by Johnson and her students at the University of Regina in the area of network communications security, modelling and management is reported.
Abstract: The national telecommunications infrastructure is increasing rapidly in complexity and the numbers of interconnected networks. To ensure high quality telecommunications service, Dr. Johnson and her students are developing an expert system that monitors evolution of the network and rejects proposals for evolution that violate rules that are built into the system. They are using an object-oriented graphical language for the rules and for constructing the user interface. Initially, they are concerned with changing network topologies and the software developed is called an expert system for network configuration. This is one part of their research goal of providing a network planning system that plans network topologies based on demands for service. Their focus is on interconnected voice networks as opposed to the rapidly emerging data services (e.g., email). The methods are expected to apply also to data networks. Three students are involved all of whom are now employed full time at telecommunications companies in Canada and continue their work on the project by providing consultation and writing scholarly papers coauthored by Dr. Johnson. We report investigative and preliminary work undertaken by Johnson and her students at the University of Regina in the area of network communications security, modelling and management. Transactions on Information and Communications Technologies vol 16, © 1996 WIT Press, www.witpress.com, ISSN 1743-3517
20 Oct 1970