Here, we consider the output tracking problem of two cascaded heat equations through boundary interconnection, where one equation is unstable and control input placed on other equation. A feedforward designed to realize desired reference signal. non-collocated static feedback proposed stabilize error system. The admissible gain obtained by applying Nyquist criterion. Then closed-loop system sho...

Due to increasing number of wireless services spectrum congestion is a major concern in both military and commercial wireless networks. To support growing demand for omnipresent spectrum usage, Cognitive Radio is a new epitome in wireless communication that can be used to exploit unused part of the spectrum by dynamically adjusting its operating parameters. While cognitive radio technology is a...

Two general schemes of neutral delay differential equations are considered. They represent non delayed systems with delayed, nonlinear feedback control. The stability conditions in terms system parameters derived using an approach based on systems, namely, the Nyquist criterion. It is also shown that those results coincide some already found literature, and others here, which classical tools, i...

Power electronics based power distribution systems (PEDSs) can offer excellent load regulation, transient performance, and, with proper architecture, a high degree of fault tolerance. They are excellent candidates in power distribution systems that need to be fullyor semi-autonomous. Typical applications include ships [1], submarines [1], aircraft [2, 3], and spacecraft [4]. Unfortunately, PEDS...

Absa.aet-This paper presents an instability version of an earlier result on robust stability analysis using a modified Nyquist plot. The result is shown to be useful for presenting robust stability and instability margins for feedback systems.

Impedance models are widely used in assessing small signal stability of grid-tied voltage source converter (VSC) systems. Recent research has proven that impedance models of grid-tied VSC in both dq and sequence domains are generally Multi-Input Multi-Output (MIMO) systems, and the generalized Nyquist criterion has to be applied for stability analysis to these MIMO systems. However, finding Sin...

In this paper, a general two-neuron model with time delay is considered, where the time delay is regarded as a parameter. It is found that Hopf bifurcation occurs when this delay passes through a sequence of critical value. By analyzing the characteristic equation and using the frequency domain approach, the existence of Hopf bifurcation is determined. The stability of bifurcating periodic solu...

In this work, the approach of the distributed transversal filter for Optical CDMA systems is addressed. It demonstrates that pulse generation and correlation functions can be accomplished in the electrical domain for multi-Gbit/s systems. The practicalities of the approach were assessed using a state of the art GaAs MMIC process. A innovate transversal filter, which is termed the dual drain-lin...