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The paper presents a model for multi-mode real-time applications and develops new techniques for the compositional analysis of systems that contain multiple such applications. An algorithm for constructing an interface for a single multi-mode application is presented. Then, a method for computing an interface of a composite application is presented, which uses only the interfaces of constituent applications...
Modern real-time systems increasingly operate with multiple interactive applications. While these systems often require reliable quality of service (QoS) for the applications, even under heavy workloads, many existing CPU schedulers are not very capable of satisfying such requirements. In this paper, we design and implement an Advanced Interactive and Real-time Scheduler, called AIRS. AIRS is aimed...
Real time control applications are very demanding in terms of closed loop system response. The challenge is to execute an operation in a predictable amount of time. As more control functions are needed, faster computing speed is preferred to achieve the desired control responses. The major processor manufacturers have given up trying to make processors run faster, at least for the time being. Instead,...
Fault tolerance is a very important aspect in critical real-time task scheduling. On multiprocessor systems, executing tasks with replication provides an additional reliability to resist potential processor failures and computing faults. For assigning real-time tasks on such systems, there must be requirements that all tasks assigned on the system meet their timing constraints, and all replicas of...
Power dissipation is a crucial issue for integrating more than billions transistors on a chip. At the same time, reduction in energy consumption will be an essential subject to build future networking environment evolutionarily. This research project proposed in this paper is aiming at developing a data-driven networking system by which the coming networking environment can be realized with ultra-low-power...
This paper describes an architecture model for data acquisition systems based on compact PCI platforms. The aim is to increase real time data processing capabilities in experimental environments such as nuclear fusion devices (e.g. ITER). The model has these features: a) real time data acquisition: the system has been provided with real time capabilities, developing specific data acquisition kernel...
This paper focuses on stream-oriented applications with real-time constraints for on-chip multiprocessors, e.g. video/audio coding. In such an application the same function, e.g. frame decoding, is executed over and over again. In general, the execution time is data-dependent. Thus, at run-time a situation may arise when the execution time exceeds the deadline specified in the real-time constraints...
An approach to hardware/software codesign and verification is presented. Hardware and software are modeled with the specification PEARL language, which has its origins in standard multiprocessor PEARL. Its usefulness has been enhanced for hierarchical and asymmetrical multiprocessor system modeling, and by additional parameters for schedulability analysis. It is meant to be a super-layer for programs,...
The development of a real-time advanced dynamic robot arm controller which is cost-effective, compact and flexible is described for a six joint arm. It utilizes IBM PC-AT as a host computer and was configurated with up to seven digital signal processors. First, the controller interprets high-level control commands from the IBM PC-AT and performs a robot arm control computation based on the Newton-Euler...
The authors' control of AC drives can be efficiently achieved by the use of inverters utilising modern power electronic devices. With the advancement of microcontroller technology, it has become possible to control AC drives with complex PWM waveforms generated by using calculating algorithms while the system is online. Such algorithms allow the manipulation of various parameters within the modulation...
Multiprocessor-based real-time control is discussed. A multiprocessor architecture is presented for the dynamic control of various engine, body, ride, and safety parameters. This architecture is extended to complex vehicles. Control of static body parameters is implemented by using a single-bit serial bus. Dynamic parameters such as the fuel/air mixture and spark timing are controlled by monitoring...
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