in this paper, an adaptive attitude control algorithm is developed based on neural network for a satellite using four reaction wheels in a tetrahedron configuration. then, an attitude control based on feedback linearization control has been designed and uncertainties in the moment of inertia matrix and disturbances torque have been considered. in order to eliminate the effect of these uncertain...

  This study investigated the effect of gender and type of written corrective feedback (WCF) on Iranian pre-intermediate EFL learners’ writing. Four intact classes were assigned to experimental and two intact classes to control groups. The learners were homogenized using a pre-test which was followed by sixteen sessions lasting one hour and forty five minutes. After receiving instruction on how...

The main role and responsibility of second language writing teachers is to help learners to write with minimal errors. To do so, teachers need to provide students with appropriate types of feedback. In this research, the researchers examined the effect of post-text written corrective feedback on written grammatical accuracy of Iranian intermediate EFL learners. In the first phase, Nelson Profic...

The aim of this work is to analyse and describe some selected papers concerned with the use of predictive control in the context of time-delay systems. This note does not intend to be exhaustive but tries to point out some major developments that occurred in the last thirty years, and more specifically the use of a predicted state in a feedback control design, in order to locate our work in thi...

The purpose of this note is to highlight similarities and differences between two alternative methodologies for feedback control design under constraints on the McMillan degree of the feedback system. Both sets of techniques focus on uniformly optimal designs. The first is based on the work of Gahinet and Apkarian, and Skelton, Iwasaki, Grigoriades and their co-workers, while the other is based...

We present a new filter based method for the calculation of PI achievable performance for simple feedback control systems. We also extend this new approach to multiloop systems and address some key questions such as (a) what would be the performance with alternate loop pairing? (b) what performance improvement will accrue through the use of decouplers in multiloop control systems? Copyright  2...

The positive stabilization problem of discrete-time descriptor systems by means of state-feedback control is studied here. Thus, conditions are developed for a state-feedback controller to make the controlled descriptor system simultaneously stable and positive. An illustrative example is provided to illustrate the proposed approach.

This paper proposes an efficient Tracking method for velocity control of an electro-hydraulic servo system (EHSS) in the presence of flow nonlinearities and internal friction. The tracking method controller is a kind of feedback error learning structure. In the proposed method, the Feedback Error Learning (FEL) algorithm is used to control the velocity. There is no need to compute the system ja...