As real-time systems are moving form centralized architectures to distributed and Internet-based ones, global task scheduling and resource management have been the central issues. However, the current resource managem...
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ISBN:
(纸本)0780377818
As real-time systems are moving form centralized architectures to distributed and Internet-based ones, global task scheduling and resource management have been the central issues. However, the current resource management techniques are based on fixed methods and hard to be extended. This paper develops a resource management framework with flexible, reusable and extensible resource management infrastructure by extending the methods provided in the real-time CORBA (RT-CORBA). The application of this framework is described in the design and implementation of an Internet-based distributed real-time system, in which a set of control nodes is distributively connected to the Internet. The system is designed for integrating multiple-platforms into the common protocol of the Internet, which extends the architecture and technology of conventional bus-based or dedicated communication-channel-based distributed systems. The client server of any node can monitor or control the status of other remote nodes in the system. Various optimizations are adopted in order to enhance the real-time performance of this system.
In this paper a model based nonlinear controller for a Gas MetaJ Arc Welding (GMAW) system is designed. The controller uses nonlinear stale feedback to exactly linearize and decouple the GMAW system. The linearized sy...
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A sliding mode controller is employed to improve the robust performance of the position control of an induction motor in response to mechanical parameter uncertainty or load torque variations. In this paper a discrete...
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Iterative median filtering for restoration of images corrupted by impulsive noise is considered. A modified version of median filtering that can be also applied iteratively is also proposed. The methods are compared w...
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Iterative median filtering for restoration of images corrupted by impulsive noise is considered. A modified version of median filtering that can be also applied iteratively is also proposed. The methods are compared with an iterative method suggested by Marvasti for images with high pixel loss. The results show that applying the median filter iteratively results in well sighted resulting images. Moreover, despite the implementation simplicity, the proposed modified median filtering scheme provides a considerably higher convergence speed which intends a lower numerical complexity.
The main contribution of the paper is an output-feedback application in the inertia wheel pendulum (IWP). Due to the absence of a separation principle, it is necessary to design control laws that guarantee robustness ...
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The main contribution of the paper is an output-feedback application in the inertia wheel pendulum (IWP). Due to the absence of a separation principle, it is necessary to design control laws that guarantee robustness against the observer error. We present a design, which renders the system iISS with respect to the observer error and, hence, ensures robustness when the error is exponentially decaying. The advantage of our design over the observer-based backstepping scheme is that we employ nonlinear damping terms, which grow slower than those in (A toolkit for nonlinear feedback design, 1989), (Singular perturbations and input-to-state stability, 1996), and result in a "softer" control law.
software systems evolve over time and undergo changes that can lead to a degeneration of the systems' architecture. Degeneration may eventually reach a level where a complete redesign of the software system is nec...
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software systems evolve over time and undergo changes that can lead to a degeneration of the systems' architecture. Degeneration may eventually reach a level where a complete redesign of the software system is necessary, which is a task that requires significant effort. In this paper, we start by presenting examples of such degeneration and continue with an analysis of technologies that can be used to diagnose degeneration. These technologies can be employed in identifying, degeneration so that it can be treated as early as possible, before it is too late and the system has to undergo a costly redesign.
softwareengineering studies run in classroom environments can and have made important contributions to empirical softwareengineering. Because the goal of such studies is to improve the state of the practice in indus...
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softwareengineering studies run in classroom environments can and have made important contributions to empirical softwareengineering. Because the goal of such studies is to improve the state of the practice in industry, researchers must understand and account for the differences between university students and industrial professionals. One major difference identified is the amount of training and practice that students and professional may have when learning a new technique. We propose and test a method of allowing university subjects to cost-effectively gain experience to compensate for this difference. The results show that the proposed method for gaining experience provided subjects with enough experience to improve their effectiveness in some but not all cases. There was also an indication from the results that the proposed method allowed the subjects to become more comfortable with a new technique.
In this paper, a method to design a nonlinear optimal controller using approximate solution of the HJB equation is presented. Using this method, the power system stabilizer is designed. In order to regulate generator ...
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ISBN:
(纸本)0780379241
In this paper, a method to design a nonlinear optimal controller using approximate solution of the HJB equation is presented. Using this method, the power system stabilizer is designed. In order to regulate generator terminal voltage to its nominal value, we use a simple neuro-automatic voltage regulator. The final control action is the sum of nonlinear optimal controller and neuro-voltage regulator. Also, the advantages of the controller with nonlinear feedback in some grounds like increasing domain of validity of the system are shown. Simulation results show that the nonlinear control action exhibits a better performance compared to that of corresponding linear counter part. As a result, the fault tolerance of the system using the nonlinear control law is increased. Also, the proposed voltage regulator, which can be trained on-line, shows satisfactory performance.
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