When designing a distributed control system, the system designer has a choice in how to connect the different units through communication channels. In practice, noiseless and noisy channels may coexist. Using the standard toy example of scalar stabilization, this paper shows how a small amount of noiseless feedback can perform a “supervisory” role and thereby boost the effectiveness of noisy fe...

Sometimes it is inconvenient or expensive to open the loop of a system to insert lag controllers—for instance, when this system is an open-loop system. A new controller structure where the loop is not opened, and that allows the design of lag controllers as in the case where one can open the loop, is presented. This result can be used by educators in undergraduate courses that deal with classic...

The paper is devoted to solution of some problems in nuclear power station generating unit intellectual control systems using genetic algorithms on the basis of control system model development, optimizations methods of their direct quality indices and improved integral quadratic estimates. Some mathematical vector models were obtained for control system multicriterion quality indices with due ...

We present an approach to model supervisory control systems based on extended behaviour networks. In particular, we employ them to formalize the control theory of the supervisor. By separating the reasoning in the supervisor and the action implementation in the controller, the overall system architecture becomes modular, and therefore easily changeable and modifiable.

In this position paper we discuss the issue of enforcing access policies in distributed environments where there is no central system designer/administrator, and consequently no guarantee that policies will be properly implemented by all components of the system. We argue that existing access control models, which are based on the concepts of permission and prohibition, need to be extended with...

In the present paper, we develop a modified pseudospectral scheme for solving an optimal control problem which is governed by a switched dynamical system. Many real-world processes such as chemical processes, automotive systems and manufacturing processes can be modeled as such systems. For this purpose, we replace the problem with an alternative optimal control problem in which the switching t...

Fuzzy control systems have had various applications in a wide range of science and engineering in recent years. Since an unstable control system is typically useless and potentially dangerous, stability is the most important requirement for any control system (including fuzzy control system). Conceptually, there are two types of stability for control systems: Lyapunov stability (a special case ...