Control reconfiguration

About: Control reconfiguration is a research topic. Over the lifetime, 22423 publications have been published within this topic receiving 334217 citations.

Compositional programming abstractions for mobile computing

Abstract: Recent advances in wireless networking technology and the increasing demand for ubiquitous, mobile connectivity demonstrate the importance of providing reliable systems for managing the reconfiguration and disconnection of components. The design of such systems requires tools and techniques appropriate to the task. Many formal models of computation, including UNITY, are not adequate for expressing reconfiguration and disconnection and are, therefore, inappropriate vehicles for investigating the impact of mobility on the construction of modular and composable systems. Algebraic formalisms such as the /spl pi/-calculus have been proposed for modeling mobility. This paper addresses the question of whether UNITY, a state-based formalism with a foundation in temporal logic, can be extended to address concurrent, mobile systems. In the process, we examine some new abstractions for communication among mobile components that express reconfiguration and disconnection and which can be composed in a modular fashion.

Applying genetic algorithms to decision making in autonomic computing systems

Abstract: Increasingly, applications need to be able to self-reconfigure in response to changing requirements and environmental conditions. Autonomic computing has been proposed as a means for automating software maintenance tasks. As the complexity of adaptive and autonomic systems grows, designing and managing the set of reconfiguration rules becomes increasingly challenging and may produce inconsistencies. This paper proposes an approach to leverage genetic algorithms in the decision-making process of an autonomic system. This approach enables a system to dynamically evolve reconfiguration plans at run time in response to changing requirements and environmental conditions. A key feature of this approach is incorporating system and environmental monitoring information into the genetic algorithm such that specific changes in the environment automatically drive the evolutionary process towards new viable solutions. We have applied this genetic-algorithm based approach to the dynamic reconfiguration of a collection of remote data mirrors, with the goal of minimizing costs while maximizing data reliability and network performance, even in the presence of link failures.

Bridging Service-Oriented Architecture and IEC 61499 for Flexibility and Interoperability

Abstract: In recent years, requirements for interoperability, flexibility, and reconfigurability of complex automation industry applications have increased dramatically. The adoption of service-oriented architectures (SOAs) could be a feasible solution to meet these challenges. The IEC 61499 standard defines a set of management commands, which provides the capability of dynamic reconfiguration without affecting normal operation. In this paper, a formal model is proposed for the application of SOAs in the distributed automation domain in order to achieve flexible automation systems. Practical scenarios of applying SOA in industrial automation are discussed. In order to support the SOA IEC 61499 model, a service-based execution environment architecture is proposed. One main characteristic of flexibility—dynamic reconfiguration—is also demonstrated using a case study example.

Compatibility of e -Services in a Cooperative Multi-platform Environment

Abstract: Dynamic composition and reconfiguration of e-Services in cooperative processes involving several organizations requires mechanisms for ensuring that each cooperative process is guaranteed to evolve correctly against its specification The cooperative process is specified and deployed as a set of cooperating e-Services, each with specific interfaces and evolution, and the concept of compatibility between e-Services is defined, based on their external behavior An algorithm for checking compatibility is proposed and a tool provides support both at design-time and at run-time A run-time architecture supporting the execution of e-Services in a multti-platform environment is dicussed, based on a repository storing all e-Services and process specifiication

Control Issues in Systems with Loop Delays

Abstract: This chapter discusses properties of feedback control systems containing loop delays (dead-time systems) and approaches to controller design for such systems. Consider the feedback system depicted in Fig. 1, where P is a plant, C is a controller, r is a reference signal, d is a disturbance, u is a control signal, and y is an output (measurement) signal. It is assumed throughout that both the measured signal y and the control signal u are delayed by hy and hu units of time, respectively. This is reflected in Fig. 1 by the two delay blocks containing the delay element Dh defined by