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La memoria della materia, la materia della memoria
No full textThe first part of the paper is devoted to the analysis of dynamical systems performance. Specifically, in these systems the effects of past inputs on the present state may be regarded as a form of memory (whereas a static system can be considered as memoryless). The second part of the paper describes the standard storage devices adopted in the field of computer technology as well as other storing devices for recording words, sounds and images
Modeling frequency responses by positive rational functions
No full textThe problem of finding a rational function of a real variable interpolating at given points (with suitable intersection numbers) while being everywhere positive is considered. The positivity requirement is essential, e.g., in modeling the square magnitude of a frequency response. This goal is achieved by resorting to a Hermite-type approach which allows one to obtain positive interpolating functions of minimum complexity by means of an efficient numerical procedure
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