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Proceedings of the EUROMICRO systems on Digital System Design, DSD 2004

作者： Petrovsky, Alexander A. Shkredov, Sergei L. Real-Time Systems Department Bialystok Technical University Poland Computer Engineering Department Belarusian State Univ. Info./R. Belarus

ISBN: (纸本)0769522033

The article is devoted to creating a complete methodology for automatic synthesis of real-time FFT-processors at structural level under the given restrictions: speed of input data receipt, structure of the computing element, and the time of the butterfly operation execution. The suggested approach involves creating parallel-pipeline structures for fixed radix FFT and for modified split radix FFT algorithms. The structures employed in the design show good possibilities for scaling the degree of parallelization, thus changing the overall throughput of the system. They are particularly suited for implementing in programmable logic basis (FPGA).

关键词： Program processors

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Control and simulation of an autonomously flying model helicopter *

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IFAC Proceedings Volumes 2004年第8期37卷 627-632页

作者： Carsten Deeg Marek Musial Günter Hommel Technische universität berlin faculty of electrical engineering and computer science real-time systems and robotics group

MARVIN is a model-helicopter based flying robot, which is able to operate completely autonomously. It has been designed to fulfill the demands of the International Aerial Robotics Competition (IARC) Millennial Event 1998-2000. To improve the flight behavior, a mathematical model of the flight characteristics has been developed, which is used for simulation. The flight control algorithm is based on a hierarchy of PID controllers. The results of simulation and real flight experiments show similar behavior in many points but also that not all effects are taken into account, yet.

关键词： Helicopter control helicopter dynamics autonomous mobile robots

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Communication system for cooperative mobile robots using ad-hoc networks

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IFAC Proceedings Volumes 2004年第8期37卷 998-1003页

作者： Volker Remuß Marek Musial Technische Universität Berlin Faculty of Electrical Engineering and Computer Science Real-Time Systems and Robotics Group

This paper presents a distributed, master-less communication system currently used for communication in a fleet of heterogeneous unmanned aerial vehicles in the European project COMETS for wired and wireless links. Communication is realized using distributed shared memory (DSM) where each network node is holding full or part of the DSM. The coherency of the DSM is kept by a real-time aware protocol that provides quality of service guarantee and dynamic routing. Furthermore, an experiment is presented using the communication system on a wireless ad-hoc network.

关键词： communication systems communication networks communication protocols mobile robots autonomous mobile robots network reliability network topologies embedded systems scheduling algorithms

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On utility accrual real-time channel establishment in multi-hop networks

On utility accrual real-time channel establishment in multi-...

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International Symposium on Object-Oriented real-time Distributed Computing

作者： K. Channakeshava B. Ravindran Bradley Department of Electrical and Computer Engineering Real-Time Systems Laboratory Blacksburg VA USA

We consider real-time CORBA 2.0 (dynamic scheduling) distributable threads operating in multihop networks. When distributable threads are subject to time/utility function-time constraints and utility accrual optimality criteria, utility accrual real-time channels must be established. Such channels transport inter-node messages of distributable threads in a way that maximizes system-wide, message-level accrued utility. We present a utility accrual channel establishment algorithm called local decision for utility accrual channel establishment (or Loc-DUCE) that heuristically computes channels. Our experimental measurements using a prototype implementation reveal that LocDUCE accrues significantly higher utility than the open shortest path first routing algorithm

关键词： Intelligent networks Spread spectrum communication Yarn time factors real time systems Dynamic scheduling Control systems Missiles Object oriented modeling Phased arrays

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An application using pinwheel scheduling model

An application using pinwheel scheduling model

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International Conference on Parallel and Distributed systems (ICPADS)

作者： Shun-hung Yu Hsin-hung Lin Chih-wen Hsueh Real-Time Systems Laboratory Department of Computer Science and Information Engineering National Chung Engineering University Chiayi Taiwan

ISBN: (纸本)0769521525

real-time systems, ranging from small portable devices or embedded systems to more complex general-purpose computers, are designed to satisfy various of real-time computation. It is the most important to guarantee all the requests are satisfied correctly in time. Rate monotonic algorithm is the most well-known real-time scheduling algorithm in the periodic task model. It not only has high schedulability, but also has a tight utilization bound to easily check whether the task set is feasible. In rate monotonic algorithm, a task is executed once in each period, but the start time of execution might be different in each period. On the contrary, for tasks scheduled using pinwheel model, the execution schedule in each period is always the same. Therefore, pinwheel scheduling model is very suitable for real-time systems which need high predictability. The pinwheel scheduling model transforms the task periods into harmonic numbers shorter than or equal to the original periods and provides many advantageous scheduling features. However, not all tasks allow to do the transformation and some would like to be executed according to their original periods. In this paper, we discuss how to solve the problem and give an application in power-aware real-time scheduling, where we can see the pinwheel model is very important in current embedded system design with power-aware requirement.

关键词： real time systems Embedded system Scheduling algorithm Hardware Operating systems Processor scheduling Embedded computing Portable computers Global Positioning System Kernel

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Radix 2 and split radix 2-4 algorithms in formal synthesis of parallel-pipeline FFT processors 12

Radix 2 and split radix 2-4 algorithms in formal synthesis o...

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12th European Signal Processing Conference, EUSIPCO 2004

作者： Petrovsky, Alexander A. Shkredov, Sergei L. Real-Time Systems Department Bialystok Technical University Wiejska 45A Street Bialystok15-351 Poland Computer Engineering Department Belarusian State University of Informatics and Radioelectronics P.Brovki 6 Minsk220027 Belarus

ISBN: (纸本)9783200001657

The article is devoted to creating a complete methodology for automatic synthesis of real-time FFT-processors at structural level under the given restrictions: speed of input data receipt, structure of the computing element, and the time of the butterfly operation execution. The suggested approach involves creating parallel-pipeline structures for fixed radices FFT and for modified split radix FFT algorithms. The structures employed in the design show good possibilities for scaling the degree of parallelization, thus changing the overall throughput of the system. They are particularly suited for implementing in programmable logic basis (FPGA). © 2004 EUSIPCO.

关键词： Fast Fourier transforms

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Multi-pipeline implementations of real-time vector DFT

Multi-pipeline implementations of real-time vector DFT

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Euromicro Symposium on Digital System Design

作者： A.A. Petrovsky S.L. Shkredov Real-Time Systems Department Bialystok Technical University Poland Computer Engineering Department Belarusian State University of Information and Radioelectronics Russia

关键词： real time systems Digital systems

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Radix 2 and split radix 2–4 algorithms in formal synthesis of parallel-pipeline FFT processors

Radix 2 and split radix 2–4 algorithms in formal synthesis ...

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European Signal Processing Conference (EUSIPCO)

作者： Alexander A. Petrovsky Sergei L. Shkredov Real-Time Systems Department Bialystok Technical University Białystok Poland Computer Engineering Department Belarusian State University of Informatics and Radioelectronics Minsk Belarus

The article is devoted to creating a complete methodology for automatic synthesis of real-time FFT-processors at structural level under the given restrictions: speed of input data receipt, structure of the computing element, and the time of the butterfly operation execution. The suggested approach involves creating parallel-pipeline structures for fixed radices FFT and for modified split radix FFT algorithms. The structures employed in the design show good possibilities for scaling the degree of parallelization, thus changing the overall throughput of the system. They are particularly suited for implementing in programmable logic basis (FPGA).

关键词： Discrete Fourier transforms Abstracts Digital signal processing Program processors Pipelines Vectors

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Automated control systems for the safety integrity levels 3 and 4

Automated control systems for the safety integrity levels 3 ...

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2003 9th IEEE International Workshop on Object-Oriented real-time Dependable systems, WORDS 2003F

作者： Halang, Wolfgang A. Department of Real Time Systems Faculty of Electrical and Computer Engineering Fern Universität 58084 Hagen Germany

Programs employed for purposes of safety related control must be formally safety licensed, which constitutes a very difficult and hitherto not satisfactorily solved problem. Striving for utmost simplicity and easy comprehensibility of verification methods, the programming methods cause/effect tables and function block diagrams based on verified libraries are assigned to the upper two Safety Integrity Levels SIL 4 and SIL 3, resp., as they are the only ones so far allowing to verify highly safety critical automation software in trustworthy, easy and economic ways. For each of the two SILs a dedicated, a low complexity execution platform is presented supporting the corresponding programming method architecturally. Their hardware is fault detecting or supervised by a fail safe logic, resp., to initiate emergency shut-downs in case of malfunctions. By design, there is no semantic gap between the programming and machine execution levels, enabling the safety licensing of application software by extremely simple, but rigorous methods, viz., diverse back translation and inspection. Operating in strictly periodic fashion, the controllers exhibit fully predictable real time behaviour. © 2003 IEEE.

关键词： Application programs

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A real-time scheduling approach for a web-based rapid prototyping manufacturing platform 23

A real-time scheduling approach for a web-based rapid protot...

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23rd International Conference on Distributed Computing systems Workshops, ICDCSW 2003

作者： Lin, Hsin-Hung Hsueh, Chih-Wen Chen, Chung-Hung Real-Time Systems Laboratory Department of Computer Science and Information Engineering National Chung Cheng University Chiayi621 Taiwan

ISBN: (纸本)0769519210

Rapid prototyping is an automated manufacturing process that quickly builds physical models from CAD files of three-dimensional prototypes. It dramatically speeds up design and manufacturing processes and substantially reduces the production cost. With the advanced Web technologies, rapid prototyping manufacturing systems can be further integrated and more effectively utilized. We have designed a distributed web platform where users can design prototypes, simulate manufacturing, and issue ordering requests for real manufacturing through browser interfaces. However, an improper scheduling approach may degrade system utilization and throughput significantly. To solve this problem, we propose a real-time scheduling approach to maximize system utilization and minimize the average response time with the best effort. Using this approach, new requests can be accepted dynamically and all accepted requests can be finished before deadlines. We show that the scheduling overhead can be neglected and the average response time is very close to the optimal solution. With the proposed scheduling approach, the Web rapid prototyping platform is able to fully utilize Web resources for rapid prototyping manufacturing and the quality of service is significantly improved. © 2002 IEEE.

关键词： Quality of service

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