time-invariant system

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time-invariant system

[′tīm in‚ver·ē·ənt ‚sis·təm]
(control systems)
A system in which all quantities governing the system's behavior remain constant with time, so that the system's response to a given input does not depend on the time it is applied.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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While classically it has spanned linear, time-invariant circuits very thoroughly, a modern presentation must introduce key ideas of nonlinearity, and periodic time variance, at the start of an undergraduate electrical engineering degree course.
In particular, he examines frequency domain techniques for analyzing the stability of linear time-invariant (LTI) systems, partly because he can explain them easily using the tools of graduate-level classical control for systems without delays-that is in terms of eigenvalues, pole placement, complex analysis, root locus, and Nyquist stability criterion.
(23-25) They are used to capture unobserved, time-invariant area characteristics and used as the offset for incidence rates, accounting for the varying size of the target population across LGAs.
People act--people choose, that is--and choices cannot be predicted on the basis of time-invariant causal laws.
Note that the problem for the time-invariant nonlinear case has been studied extensively [3,4,7-9,15,19].
This final factor allows us to control for both time-invariant and time-varying neighborhood characteristics that affect property values.
FEM removes the effects of those time-invariant characteristics (religion, race, culture, etc.).
The main benefit of this approach is that it enables us to model the effect of time-invariant (or, at least, "slow moving") variables, most notably proxies for institutional development.
The first case, referred to as time-invariant, involved a single fixed rate of natural mortality over the entire time period.
residential customers pay time-invariant electricity prices.
This is to reduce unobserved heterogeneity either time-invariant, or related to provincial characteristics, and to prevent endogeneity.

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