Object-Oriented Real-Time Dependable Systems, 1994. Proceedings of WORDS 94., First Workshop on

24-25 Oct. 1994

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  • Proceedings of Words '94. The First Workshop on Object-Oriented Real-Time Dependable Systems

    Publication Year: 1994
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    Freely Available from IEEE
  • Author index

    Publication Year: 1994
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    Freely Available from IEEE
  • Resource scavenging in object-oriented, real-time, fault-tolerant control systems

    Publication Year: 1994, Page(s):163 - 167
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (328 KB)

    This paper presents a variety of resource management techniques for real-time, fault-tolerant control systems. These techniques are based on resource scavenging, a concept that is introduced in this paper. Resource scavenging techniques attempt to meet transient resource shortfalls in one part of the system by reassigning resources from other parts of the system. The techniques presented take adva... View full abstract»

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  • Calculation of execution times in RealTimeTalk-an object-oriented language for real-time

    Publication Year: 1994, Page(s):153 - 162
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    This paper describes the calculation of execution times in RealTimeTalk (RTT). RTT is an object-oriented language for hard real-time systems, i.e., systems which must fulfil the specified time requirements. An overview of RTT is given. The control structures in RTT are analysed and equations for the calculation of minimum and maximum execution times are given. The RTT timing analysis tools are des... View full abstract»

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  • DEAL: an object-oriented language for distributed real-time systems

    Publication Year: 1994, Page(s):146 - 152
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (608 KB)

    This paper describes the language-design rationale and the most interesting features of a programming language for distributed real-time systems. The language, called DEAL, is object oriented and based on the C++ language. To make DEAL suitable for the implementation of hard real-time applications there are some restrictions as well as extensions to the C++ base-language. The most prominent langua... View full abstract»

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  • Operating system support for object dependencies in persistent object stores

    Publication Year: 1994, Page(s):18 - 25
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (728 KB)

    Persistent object stores provide uniform management of short-term and long-term objects. Such stores ensure the integrity of the data even after occurrence of a failure, by guaranteeing the existence of some previous self-consistent stable state at each point in time. Maintaining a consistent state of a persistent store necessitates recording of inter-object dependencies and checkpointing of each ... View full abstract»

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  • A meta-model for fault management

    Publication Year: 1994, Page(s):138 - 144
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    This paper describes the top level of a meta-model for fault management. This meta-model can be used to help refine existing terminology. It can also be used to formalize standard development strategies for fault management services. This work is the outgrowth of a modeling effort that was performed by the Services for Reliable, Available, and Serviceable Systems Working Group (SRASS WG) which has... View full abstract»

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  • Smart objects for dependable real-time systems

    Publication Year: 1994, Page(s):10 - 17
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (628 KB)

    We present a modular approach to systematically introduce fault-tolerant properties into the design of time-dependent software components. The G-Net methodology for object-oriented complex software system design and the EU model for object-oriented dependable system design are integrated into the unified concept of the smart object, which is an object with an associated knowledge structure that in... View full abstract»

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  • Lazy fault tolerance-a method for dependable distributed systems

    Publication Year: 1994, Page(s):124 - 131
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (548 KB)

    We present a method called Lazy Fault Tolerance for refining the reliability of distributed systems. Lazy Fault Tolerance uses data redundancy and the data of objects are distributed over computers in accordance with their `nativity', The data of system management objects, which control the whole system based on the information of each computer, are naturally distributed over all computers. The ob... View full abstract»

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  • Distributed real-time objects: the ANSA approach

    Publication Year: 1994, Page(s):71 - 78
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (708 KB)

    Object orientation, distributed computing and real time computing are well established research areas, but their integration are yet to be studied, because they seldom use compatible techniques. The paper reviews some experiences in the design, implementation and performance evaluation of two object based system environments for distributed real time applications. The two environments are based on... View full abstract»

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  • Real-time databases: characteristics and issues

    Publication Year: 1994, Page(s):113 - 116
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (364 KB)

    Real time database transactions have explicit timing constraints, such as deadlines. Conventional database systems may lack features required for supporting real time transactions. Meeting the requirements of RTDBS will require a balanced and coordinated effort between concurrency control and real time scheduling. One approach is to combine existing concurrency control protocols with real time sch... View full abstract»

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  • Object behavior composition by transition and state composition

    Publication Year: 1994, Page(s):28 - 35
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (596 KB)

    Behavior composition is essential to construct an object-oriented system from interacting objects. We propose a method to compose behaviors of the objects typically found in real-time applications. In our approach, the behaviors of individual objects are first represented by extended state-transition diagrams (ESTDs). Then, in order to obtain the combined behavior of interacting objects, we tentat... View full abstract»

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  • On the reliability of dependable soft real-time cooperating systems

    Publication Year: 1994, Page(s):132 - 137
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    We consider real time systems where multiple agents cooperate to jointly achieve the system goal. Further, the quality of the output of each agent has a fuzzy rather than a binary (pass/fail) value. The system model is defined and illustrated using examples from manufacturing and defense systems. Then, the reliability models for various types of service expectations are formulated and applied to a... View full abstract»

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  • A time domain beamformer object oriented analysis and design

    Publication Year: 1994, Page(s):2 - 9
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    The paper describes the analysis and design of a time domain beamformer, using object modeling techniques, as a subset of a real-time sonar signal processing system. The goal is to illustrate the relationship of portability and reuse to object oriented analysis. This task is part of an initiative to foster the application of fast paced, emerging commercial technology to the development and acquisi... View full abstract»

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  • An O-O communication subsystem for real-time distributed Mach

    Publication Year: 1994, Page(s):79 - 84
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (452 KB)

    Our new communication subsystem for Mach has offered us the opportunity to integrate object oriented programming, real time and fault management. Starting with the Mach operating system and an object oriented protocol development toolkit, based on University of Arizona's x-kernel, we have designed and implemented real time and fault isolation capabilities. The flexibility and extensibility of the ... View full abstract»

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  • Timely failure detection in a large distributed real-time system

    Publication Year: 1994, Page(s):118 - 123
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (524 KB)

    The paper describes the experience of designing and implementing failure detection and reporting in a large distributed real time system used for air traffic control (ATC). We believe that systematic analysis is needed to guide the failure detection design and track the large number of failures that it deals with. Analysis such as how fast failures have to be detected should be performed carefully... View full abstract»

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  • Distinguishing features and potential roles of the RTO.k object model

    Publication Year: 1994, Page(s):36 - 45
    Cited by:  Papers (39)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (928 KB)

    In recent years, searching for a proper extension of the basic object model to meet the needs present in hard-real-time system development environments has become a serious research issue. The first co-author and Hermann Kopetz at the Technical University of Vienna formulated an extension of the basic object model, called the RTO.k object model, as one attempt to meet such needs. In the past two y... View full abstract»

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  • The design of real-time extensions to the Open Object Oriented Database system

    Publication Year: 1994, Page(s):86 - 93
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (632 KB)

    The paper describes real time extensions to the Open Object Oriented Database system using the RTSORAC data model. This model combines an object oriented data model, real time requirements, flexible transactions, semantic relationships among objects, and active database features. Several extensions to the Open Object Oriented Database system, including development of interfaces for real time objec... View full abstract»

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  • The Chimera Methodology: designing dynamically reconfigurable real-time software using port-based objects

    Publication Year: 1994, Page(s):46 - 53
    Cited by:  Papers (1)
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    The Chimera Methodology is a new software engineering paradigm which addresses the problem of developing dynamically reconfigurable and reusable real-time software. The foundation of the Chimera Methodology is the port-based object model of a reusable software component. The model is obtained by applying the port-automaton formal computational model to object-based design. Global state variable ta... View full abstract»

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  • Stable object storage for multiprocessors with distributed shared memory

    Publication Year: 1994, Page(s):94 - 99
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    We present the design of a stable object storage for a parallel computer with distributed shared memory. A prototype has been built for our experimental multiprocessor MEMSY. The stable storage has been realized with RAM memory in order to obtain short access times. The objects stored are primarily checkpoints for roll back recovery View full abstract»

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  • An analysis of the communication service in responsive systems

    Publication Year: 1994, Page(s):56 - 62
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    Any communication service in a fault-tolerant distributed real-time systems must provide a short latency, a minimal latency jitter, and support the property of replica determinism. The paper discusses the requirements for real-time communication protocols and points out that there are fundamental conflicts in protocol objectives. It then analyzes the media access control mechanism of a number of p... View full abstract»

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  • A network approach to integrity maintenance of active object bases

    Publication Year: 1994, Page(s):100 - 105
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    The paper describes an asynchronous, network based algorithm to enforce integrity control on top of active objects. It proposes that the control of each active object be expressed as production rules, and the production rules associated with the objects be compiled into a network so that they can be evaluated collectively using databased operations. To maintain correctness and exploit all possible... View full abstract»

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  • Deterministic characterization and network utilizations for several distributed real-time applications

    Publication Year: 1994, Page(s):63 - 70
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (632 KB)

    In this paper, we investigate several distributed real-time applications. The applications are real-time in that they require per-connection end-to-end performance bounds. These bounds, in terms of throughput, delay, and delay-jitter, are provided by the network via two mechanisms: admission control to limit access to the network and priority scheduling to enforce the guarantees. Within this frame... View full abstract»

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  • Military requirements for object-oriented real-time dependable database systems

    Publication Year: 1994, Page(s):108 - 112
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    We review requirements for military database systems, what added database support is being developed for them, and ongoing concept development efforts and change proposal recommendations by the US Navy and the American national standards institute (ANSI) in cooperation with private industry and academia for real time database management systems standard features. We examine the unique information ... View full abstract»

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