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Real-Time Systems, 1994. Proceedings., Sixth Euromicro Workshop on

Date 15-17 June 1994

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  • Proceedings Sixth Euromicro Workshop on Real-Time Systems

    Publication Year: 1994
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    Freely Available from IEEE
  • On-line sporadic task scheduling in hard real-time systems

    Publication Year: 1994, Page(s):186 - 191
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (460 KB)

    We propose a set of scheduling procedures for dealing with the sporadic task scheduling in a dynamic periodic system. For this we mean a system in which periodic tasks change their parameters dynamically (at run-time), in an unpredictable way. So, the off-line periodic task set will be different from the current periodic task set. It means that the task schedulability tests in such systems have to... View full abstract»

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  • Modeling and scheduling real-time control systems with relative consistency constraints

    Publication Year: 1994, Page(s):46 - 52
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (504 KB)

    Control applications control and monitor an external physical environment. Process control and manufacturing systems are examples of such applications. In such systems the temporal relationship between the external environment and the control system plays an important role. In this paper, the temporal relationship of data within the control system and the external environment, known as data tempor... View full abstract»

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  • Object-based design of embedded software using real-time operating systems

    Publication Year: 1994, Page(s):194 - 198
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    Embedded systems are used in everyday electronic consumer products and industrial equipment, e.g. television sets, radios, cars, and mobile phones. Rapid developments which have taken place in computer hardware and software technologies have led to the increased complexity of embedded systems. Promising results have been achieved in the development of complex information processing systems using o... View full abstract»

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  • Object-oriented enhancement of real-time software using a heterogeneous re-engineering approach

    Publication Year: 1994, Page(s):98 - 103
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (460 KB)

    A technique for incremental modernisation and enhancement of an existing procedural real-time software to an object-oriented one is presented. The incremental enhancement enables the real-time system designer to make use of the advantages of object-oriented paradigm: the resulting re-engineered software is more maintainable, reusable and configurable. In this approach, the object structure and add... View full abstract»

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  • Interprocessor-blocking independent static task allocation for shared-bus real-time multiprocessors

    Publication Year: 1994, Page(s):53 - 58
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    In real-time systems, guaranteeing the schedulability of high priority tasks is more important than being able to schedule more tasks under resource constraints. The system bus in bus-based multiprocessors is a shared resource that is usually arbitrated by priority and fairness. This paper presents a new static task allocation strategy that takes into consideration the impact of bus arbitration po... View full abstract»

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  • The modular multimicroprocessor system architecture for the power turbine control

    Publication Year: 1994, Page(s):124 - 127
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (288 KB)

    The modular multimicroprocessor control system (MMCS) architecture for turbine control is presented. The turbine features which are produced by “Metalicheskiy Zavod” plc (St.-Petersburg) are considered. The multilayered MMCS system organization for these turbines is described. The architecture of distributed modular multimicroprocessor control system (MMCS) for turbo-unit technological... View full abstract»

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  • Guaranteed deadlines with dynamic recovery blocks in distributed systems

    Publication Year: 1994, Page(s):199 - 204
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (468 KB)

    In a hard real-time system, a timing fault is said to occur when a real time task delivers its results too late. An deadline mechanism has been proposed to avoid timing faults in uniprocessor machines. Under this approach, every task is implemented with two algorithms: on one hand, a primary program produces a good quality service but in an unknown and possibly infinite length of time due to softw... View full abstract»

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  • The sequencing of data flow tasks in SIGNAL: application to active vision in robotics

    Publication Year: 1994, Page(s):80 - 85
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (476 KB)

    Many applications of real-time systems feature a combination of “continuous” (possibly sampled) and discrete (sequencing and task control) behaviors, both reactive to the evolutions of the execution environment. In particular, robotics applications involve the programming of the control functions for each task, and the sequencing of such tasks at a higher level. In the framework of the... View full abstract»

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  • Enhancing real-time object-oriented analysis methods

    Publication Year: 1994, Page(s):104 - 109
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    Discusses the application of object-oriented concepts to the development of real-time systems, focusing mainly on the requirements engineering phase. Shortcomings of existing real-time specification methods are identified. A proposal to overcome these shortcomings is presented. Our approach enhances existing object-oriented analysis (OOA) methods concerning a high-level description and consistency... View full abstract»

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  • Neural networks for multiprocessor real-time scheduling

    Publication Year: 1994, Page(s):59 - 64
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (484 KB)

    In recent years, neural networks have become a popular area of research, especially after Hopfield and Tank opened the way for using neural networks for optimization purposes and surprised the scientific community by their paper (Biological Cybernetics, vol. 52, pp. 141-52, 1985) presenting a circuit to give approximate solutions for the classical traveling salesman problem in a few elapsed propag... View full abstract»

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  • A dynamic scheduling algorithm for semi-hard real-time environments

    Publication Year: 1994, Page(s):130 - 137
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (620 KB)

    In many real-time systems, it is crucial for the application tasks to meet their specified deadlines, otherwise the tasks cause catastrophic results. Every task is generally periodic, and the value of its period depends on the dynamics of the process it controls. In addition, some additional time-critical tasks said to be sporadic can occur and require to be processed at unpredictable times. The p... View full abstract»

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  • Formal specification and verification of a real-time kernel

    Publication Year: 1994, Page(s):205 - 211
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (412 KB)

    The paper presents a case study of application of the VDM formal method to specification and verification of a simple real-time kernel. Specifications of selected external services of the kernel are presented. Then the verification methodology is introduced by demonstrating its basic steps in relation to verification of a selected function-a process waiting for a signal on a condition variable. Th... View full abstract»

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  • Scheduling in a hard real-time system with shared resources

    Publication Year: 1994, Page(s):234 - 239
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (500 KB)

    Hard real-time systems are those systems in which correctness depends on logical results of the computations as well as the times at which these results are produced. In a real-time context, concurrency control protocols for shared resources (as databases) must not only maintain the consistency constraints but also satisfy timing requirements of transactions. So, several protocols have been propos... View full abstract»

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  • Pinwheel scheduling with three distinct numbers

    Publication Year: 1994, Page(s):174 - 179
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (444 KB)

    Given a multiset of positive integers A={a1, a2 , ..., an}, the pinwheel problem is to find an infinite sequence over { 1, 2,..., n} such that there is at least one symbol i within any subsequence of length ai. The density of A is defined as ρ(A)=Σi=1n (1/ai). We limit ourselves to instances composed of three di... View full abstract»

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  • A software architecture for telerobotics

    Publication Year: 1994, Page(s):86 - 90
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    Describes a currently developed software architecture for telerobotics, based on a high-level and interpreted language, PILOT (Programming and Interpreted Language Of actions for Telerobotics), allowing one to plan the actions of a robot. Such a language allows the operator to modify a mission during its execution. A software architecture is developed for this language, and is composed of four mod... View full abstract»

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  • A software architecture for complex real-time systems

    Publication Year: 1994, Page(s):110 - 115
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (484 KB)

    The increasing use of computer-based control systems in complex applications requires modelling techniques which make it easier to develop and maintain these systems. One promising approach is to use object-orientation. The difficulty is that a traditional object-oriented programming language is most suitable for use in small projects and therefore is not directly scalable to a heterogeneous and d... View full abstract»

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  • A resynchronization method for real-time supervision

    Publication Year: 1994, Page(s):66 - 71
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (536 KB)

    Real-time supervision is one technique used to improve the perceived reliability of software systems. A real-time supervisor observes the inputs and outputs of the system and reports failures that occur. The approach presented in this paper uses the specification of external behavior of the system to detect failures. Failures are reported in real-time. In addition, the approach permits the assessm... View full abstract»

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  • Fixed priority scheduling with deadlines prior to completion

    Publication Year: 1994, Page(s):138 - 142
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (288 KB)

    Standard analysis for fixed priority scheduling assumes that all the computations for each task must be completed by the task's deadline. In practice this is rarely the case. The deadline is more correctly associated with the last observable event of the task, interval events and kernel overheads (such as the context switch away from the task) can occur after the deadline. New analysis is presente... View full abstract»

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  • Timing analysis and conditional scheduling in a real-time system design environment

    Publication Year: 1994, Page(s):214 - 219
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (524 KB)

    This paper presents an approach to carry out timing analysis and scheduling in a real-time system design environment for flexible manufacturing systems. It is built based on a formal model for specifying real-time systems using extended timed Petri nets. The designer uses the model to specify a design at a given level. The functional characteristics as well as timing properties of the design can t... View full abstract»

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  • Simple and robust: fuzzy for antislip

    Publication Year: 1994, Page(s):240 - 245
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    The authors present the design of an intelligent control for industrial off road vehicles with hydrostatic power transmission to prevent wheel slippage. Timing and robustness were of particular interest. The authors employed a system of interconnected wheel processors, which house a two level local/global fuzzy control algorithm View full abstract»

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  • On using epsilon serializable locking protocol for concurrency control in real-time databases

    Publication Year: 1994, Page(s):150 - 155
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (388 KB)

    New non-serializable protocols based on incorporating epsilon serializability (ESR) into the real-time concurrency control protocol, Hybrid Two Phase Locking (Hb2PL) are proposed. The protocols try to maximize the values of the transactions by making a compromise between meeting transaction deadlines and maintaining consistent transaction view. Two different ways of incorporating ESR into Hb2PL ar... View full abstract»

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  • Modular specification of real-time systems

    Publication Year: 1994, Page(s):16 - 21
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB)

    Duration Calculus, a real-time interval logic, has been embedded in the Z specification language to provide a notation for real-time systems that combines the modularisation and abstraction facilities of Z with a logic suitable for reasoning about real-time properties. In this article the notation is presented through a top-level specification of requirements for a simple air traffic monitoring sy... View full abstract»

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  • The derivation of scheduling algorithms from a timing model

    Publication Year: 1994, Page(s):180 - 185
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    We first present a timing model for describing the temporal behaviour of a real-time application. Then, within this model, we specify formally the scheduling problem through a relation between so called temporal profiles. We show how this relation can be generically decomposed and implemented on different machine architectures View full abstract»

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  • Realtime-learning on an autonomous mobile robot with neural networks

    Publication Year: 1994, Page(s):40 - 44
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    We discuss the usage of neural network clustering techniques on a mobile robot, in order to build qualitative topologic environment maps. This has to be done in realtime, i.e. the internal world-model has to be adapted by the flow of sensor-samples without the possibility to stop this data flow. Our experiments are done in a simulation environment as well as on a robot, called ALICE View full abstract»

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