Circuits and Systems II: Express Briefs

Abstract-For multiple model adaptive control systems, "multi-controller" architecture can be efficiently implemented (multirealised) by means of a "state-shared" parameterdependent feedback system. Necessary and sufficient conditions for the multirealisation of a family of linear multivariable systems based on matrix fractional descriptions are presented. The problem of the minimal generic multirealisation of a set of linear systems is introduced and solved. Index Terms-System multirealisation, linear multivariable systems, switching systems, Multiple Model Adaptive Control

Multirealization of Linear Systems

For multiple-model adaptive control systems, "multicontroller" architecture can be efficiently implemented (multirealized) by means of a "state-shared" parameter-dependent feedback system. Necessary and sufficient conditions for the multirealization of

Theoretical methodologies for sustainability policy: historical development and logical structure

This paper presents a broad taxonomy of policy methodologies that have been proposed for sustainability. Methodological development is tracked historically from a) unidirectional causation models in an "environmental impact" framework to b) dynamical models within a "natural capital" framework to c) more recent "resilience and adaptability" frameworks that will require fuller, more explicit, representation of unpredictability. The relation between these policy frameworks is not one of mutual exclusion. Contrariwise, successive causal modeling and policy analysis methods are better understood as generalisations of previous ones. This clarifies the more specific contexts under which the simpler frameworks can be validly applied as special cases of the general