Abstract – This paper deals with robust stability of linear time-invariant (LTI) systems with unstructured uncertainties. A new relation between uncertainties and system poles perturbed by the uncertainties is derived from a graphical analysis. A stability criterion for LTI systems with uncertainties is proposed based on this result. The migration range of the poles in the proposed criterion is...

A method for structural and parameter identi…cation of a slowly time-varying systems is proposed. The frozen-time method is used in this analysis. By means of this method we obtain consecutive LTI models, which are identi…ed in consecutive discrete instants using the Qualitative System Identi…cation (QSI) Algorithm. The proposed algorithm models the behavior of the ODE’s coe¢ cients means of po...

Lymphoid tissue inducer (LTi) cells have been characterized in mouse as a key cell when secondary lymphoid tissues are organized during development and memory T cells are formed after birth. In addition to their involvement in adaptive immune responses, recent studies show that they contribute to innate immune responses by producing large amount of interleukin (IL)-22 against microbial attack. ...

Malignant tumorswill cause localized temperature increases (LTI) on breast surfacewhich showas spot or vascular patterns in breast infrared thermograms. Thermographic detection of breast cancer now primarily depends on the visual analysis of these patterns by physicians, which is hard to provide objective and quantitative results. In this paper, we propose a new criterion of breast cancer detec...

Background: The aim of the present study was to assess the relative effectiveness of a high intensity intervention compared with a low intensity intervention for smoking cessation support in a dental clinic setting. Method: 300 smokers attending dental or general health care were randomly assigned to two arms and referred to the local dental clinic for smoking cessation support. One arm receive...

This article proposes a method to compute the maximum allowable delay time (  ) for linear-timeinvariant-time-delayed-systems (LTI-TDS) with state-PID feedback control. It presents the main theorem with corollary, and computing steps to obtain .  Stability of a LTI-TDS with stateproportional integral derivative (PID) feedback is ensured if the delay time is less than .  The proposed approach...

Inverse optimal control is a classical problem of control theory. It was first posed by Kalman in the early sixties. The problem, as addressed in literature, answers to the following two questions: (a) Given system matrices A,B and a gain matrix K, find necessary and sufficient conditions for K to be the optimal of an infinite time LQ problem. (b) Determine all weight matrices Q, R and S which ...

Stability and stabilization analysis of fractional-order linear time-invariant (FO-LTI) systems with different derivative orders is studied in this paper. First, by using an appropriate linear matrix function, a single-order equivalent system for the given different-order system is introduced by which a new stability condition is obtained that is easier to check in practice than the conditions ...