Timed event graphs are described in dioids by a linear state-space or transfer function model. This paper proposes a state feedback control under complete control and observation of the states. By using a model reference control approach, the closed-loop transfer function matches the control specification expressed as a given transfer function. It is shown that under certain conditions an optim...

The design of excitation controllers to improve transient stabilization of power systems is a topic of renewed interest in the control community. Existence of a state– feedback stabilizing law for multi–machine aggregated reduced network models has recently been established. In this paper we extend this result in two directions: first, in contrast with aggregated models, we consider the more na...

The approach adopted in this paper for the problem of transient stabilization of multimachine power systems sees the entire network as the (structure-preserving) interconnection of the network components, described by well known models. These structure-preserving models preserve the identity of the network components and allow for a more realistic treatment of the loads. Our main contribution i...

In this paper, a general framework for image contrast enhancement algorithm based on an optimization problem is presented. Through this optimization, the intensities can be better distributed. The algorithm is based on the facts that the histogram of the enhanced image is close to the input image histogram and uniform distribution, simultaneously. Based on this fact, we obtain a closed form opt...

This paper is devoted to the problem of designing a sliding surface for an underlying system, while H2/H∞ performance specifications of the closed-loop system are under control. This scheme is different from a large number of the existing methods in the literature for the sliding surface design, in the sense that it will penalize the required level of control effort to maintain sliding. This no...

A discrete mixed H2/H1 optimal control problem is studied, where an upper bound on an H2 cost is minimized subject to an H1 norm bound on the closed-loop transfer function. New synthesis equations for the optimal controller are obtained, which are the discrete-time counterparts of continuoustime synthesis equations given in the literature. The synthesis equations are obtained by deriving a set ...

This paper is concerned with delay-dependent exponential stability analysis and stabilization for continuous-time T-S fuzzy Markovian jump systems with mode-dependent time-varying delay. By constructing a novel Lyapunov-Krasovskii functional and utilizing some advanced techniques, less conservative conditions are presented to guarantee the closed-loop system is mean-square exponentially stable....

In this paper, control of a non-isothermal continuous stirred tank reactor in which two parallel autocatalytic reactions take place has been addressed. The reactor shows chaotic behavior for a certain set of reactor parameters. In order to control the product concentration, an optimal state feedback controller has been designed. Since concentrations of reactor species are ...

Among the latest efficient approaches in language teaching, Task-based Language Teaching has turned up to be the main approach in a way that it is currently recognized as the leading teaching approach in language instruction (Ji & Pham, 2017). Using the proper tasks based on the proficiency level of the learners can facilitate the process of language learning. The present study aimed at...