We consider the adaptive control for nonstrict-feedback uncertain nonlinear high-order fully actuated (HOFA) systems with either constant delay or time-varying delay. Different from previous works, most difficult point is that function in HOFA contains nonstrict feedback form and time system states. In order to overcome this difficulty, arbitrary approximation property of radial basis neural ne...

This paper considers the problem of adaptive output feedback tracking control for a class of nonstrict-feedback nonlinear systems with unknown time-varying delays and unknown backlash-like hysteresis. Fuzzy logic systems are used to estimate the unknown nonlinear functions. Based on the Lyapunov–Krasovskii method, the control scheme is constructed by using the backstepping and adaptive techniqu...

abstract the extent to which teachers’ written corrective feedback (wcf) is conducive to esl learners’ improvement has been discussed since truscott’s claim in 1996. the mentioned debate continues because there has been lots of contrastive research studies with different results. this paper presents the results of a 2-month study of the effectiveness of wcf to 65 low intermediate iranian learne...

This paper focuses on the event-triggered neuroadaptive output-feedback tracking control issue for nonstrict-feedback nonlinear systems with given performance specifications. By constructing a neural observer to estimate unmeasurable states, novel controller is presented together piecewise threshold rule. The mechanism has two thresholds reduce communication resources between and actuator. sali...

Every \practical" programming language supplies the programmer with at least one nonstrict construct, such as the ALGOL60 arithmeticìf-then-else' and the LISP`cond'. Many programming languages also enable the user to deene nonstrict functions. In some languages, this is accomplished through the lazy evaluation of procedure parameters, as realized, for example, by the call-by-name devices of ALG...

We provide explicit closed form expressions for strict Lyapunov functions for time-varying discrete time systems. Our Lyapunov functions are expressed in terms of known nonstrict Lyapunov functions for the dynamics and finite sums of persistency of excitation parameters. This provides a discrete time analog of our previous continuous time Lyapunov function constructions. We also construct expli...