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IEEE international symposium on object/Component/Service-oriented real-time distributed computing

作者： Lee, Sang-Hun Jin, Hyun-Wook Konkuk Univ Dept Comp Sci & Engn Seoul 143701 South Korea

ISBN: (纸本)9780769535739

Many emerging embedded systems consist of multiple embedded nodes, which are connected through an internal small area network. In such systems, the synchronization between the embedded nodes is essential to provide real-time cooperation environment. On small area networks, the severe obstacle for achieving real-time synchronization is the unpredictable overhead of the system software running on the embedded nodes. This is true especially if a traditional operating system has been installed. Despite of these drawbacks, it is quite common to run traditional operating systems on some of the embedded nodes to utilize various existing applications. In this paper, we propose a novel design of communication primitives called RTDiP-Sync for real-time distributed synchronization over small area networks. Experiment results show that the suggested design can minimize the communication overhead and provide better overhead prediction.

关键词： Synchronization

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Building middleware for real-time dependable distributed services 1

Building middleware for real-time dependable distributed ser...

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1st international symposium on object-oriented real-time distributed computing (ISORC 98)

作者： Travostino, F Feeney, L Bernadat, P Reynolds, F Open Grp Res Inst Cambridge Ctr 11 Cambridge MA 02142 USA

ISBN: (纸本)0818684321

We consider a real-time, distributed service to be dependable if it continues to have timely, predictable behavior even in the presence of partial failures. Services with this property are desirable in a host of real-time scenarios, including factory floor automation, medical monitoring equipment, and combat systems. Most distributed services built with contemporary fault-tolerance toolkits are not dependable;they exhibit unpredictable, albeit logically correct, behavioral patterns under failure conditions. We have designed and implemented middleware explicitly for real-time dependable services. We aimed at maintaining sub-second worst-case guarantees for failure detection and recovery, even when failures conspire with network load and CPU load to undermine determinism. The paper reports our experience in marrying software fault tolerance and real-time disciplines, from the definition of the requirements to the characterization of the resulting system.

关键词： Middleware

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Integrated environment based on object-oriented methodology for real-time systems 1

Integrated environment based on object-oriented methodology ...

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1st international symposium on object-oriented real-time distributed computing, ISORC 1998

作者： Keum, Chang Sup Lee, Joon Kyung Lee, Donggill Lee, Byung Sun Software Environment Section Electronics and Telecommunications Research Institute 161 Kajong-Dong Yusong-Gu Taejon305-350 Korea Republic of

ISBN: (纸本)0818684305

This paper describes an integrated environment based on the object oriented methodology for real-time systems. The object oriented methodology is composed of six phases: Requirements analysis, system analysis, system design, object design, implementation and testing. The OMT object model and use case model are used in the analysis phase, SDL-92 in the design phase and CHILL-96 in the implementation phase. To provide proper object oriented development support an integrated environment has been developed. This integrated environment provides seamless tool support from analysis to testing. Finally, experimental object oriented PABX is evaluated for the feasibility study. © 1998 IEEE.

关键词： real time systems

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The Price of Schedulability in Multi-object Tracking: The History-vs.-Accuracy Trade-Off 23

The Price of Schedulability in Multi-Object Tracking: The Hi...

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IEEE 23rd international symposium on real-time distributed computing (ISORC)

作者： Amert, Tanya Yang, Ming Nandi, Saujas Vu, Thanh Anderson, James H. Smith, F. Donelson Univ North Carolina Chapel Hill Dept Comp Sci Chapel Hill NC 27599 USA

ISBN: (纸本)9781728169583

Autonomous vehicles often employ computer-vision (CV) algorithms that track the movements of pedestrians and other vehicles to maintain safe distances from them. These algorithms are usually expressed as real-time processing graphs that have cycles due to back edges that provide history information. If immediate back history is required, then such a cycle must execute sequentially. Due to this requirement, any graph that contains a cycle with utilization exceeding 1.0 is categorically unschedulable, i.e., bounded graph response times cannot be guaranteed. Unfortunately, such cycles can occur in practice, particularly if conservative execution-time assumptions are made, as befits a safety-critical system. This dilemma can be obviated by allowing older back history, which enables parallelism in cycle execution at the expense of possibly affecting the accuracy of tracking. However, the efficacy of this solution hinges on the resulting history-vs.-accuracy trade-off that it exposes. In this paper, this trade-off is explored in depth through an experimental study conducted using the open-source CARLA autonomous-driving simulator. Somewhat surprisingly, easing away from always requiring immediate back history proved to have only a marginal impact on accuracy in this study.

关键词： autonomous driving cyber-physical systems multi-object tracking real-time systems

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Nested invocation protocol for object-based systems 6

Nested invocation protocol for object-based systems

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6th IEEE international symposium on object-oriented real-time distributed computing

作者： Hori, K Enokido, T Takizawa, M Raynal, M Tokyo Denki Univ Tokyo Japan

ISBN: (纸本)0769519288

We discuss how to invoke a method on multiple object replicas in a quorum-based way. Suppose each instance of a method t on replicas of an object x invokes another method u on replicas in a quorum of an object y. Here, the method u is redundantly invoked multiple times on some replicas of the object y. If each instance of the method t issues a method to its own quorum, more number of replicas are manipulated than the quorum number This is quorum expansion. We discuss a protocol to invoke methods on replicas in a nested manner without the redundant invocation and quorum expansion. We evaluate the protocol on how many replicas are manipulated and requests are issued.

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A cooperative simulation mechanism of distributed control systems based on object-oriented design patterns 6

A cooperative simulation mechanism of distributed control sy...

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6th IEEE international symposium on object-oriented real-time distributed computing

作者： Tomura, T Kanai, S Kishinami, T Asahikawa Natl Coll Technol Asahikawa Hokkaido Japan

ISBN: (纸本)0769519288

distributed control systems (DCSs) consisting of a plant, a controller composed of many devices, and an open network interconnecting devices, are now used in many automation areas. For assuring the control performance under the heavy traffic on the network, the simulation of DCS is strongly needed. In the case of DCSs for controlling a mechanical plant, the graphical and cooperative simulation between the controller model and the plant model becomes important to verify the sequence of motions of the plant. For this purpose, we propose a systematic object-oriented-based DCS modeling procedure to efficiently and uniformly develop the DCS simulation model. From this procedure, we can describe the formal description of DCS simulation model based on five object-oriented design patterns which describe the structure and behavior of the DCS. We also propose an event chain mechanism between the statechart-based controller model and the graphical plant model. Finally, the cooperative DCS simulation software is developed by! using the Java 3D API.

关键词： distributed parameter control systems

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Component customization for object-oriented distributed real-time software development 3

Component customization for object-oriented distributed real...

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3rd IEEE international symposium on object-oriented real-time distributed computing, ISORC 2000

作者： Yau, S.S. Karim, F. Computer Science and Engineering Department Arizona State University TempeAZ85287 United States

ISBN: (纸本)0769506070

To apply the component-based approach to distributed real-time software development, it is necessary to identify components based on both functional and real-time requirements. Since a component may be acquired from external sources, it becomes necessary during integration to ensure that a component satisfies the real-time requirements of the target application software. Since these requirements vary, customizable so that during integration it can adapt itself to the specific real-time requirements of the target-distributed software. To facilitate such activities, it is preferable to have components that are capable of performing self-customization using a set of built-in services. In this paper, an object-oriented real-time component framework and two built-in customization services are presented to address the specified issues. © 2000 IEEE.

关键词： Integration

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CORBA for real-time, high performance and embedded systems 4

CORBA for real-time, high performance and embedded systems

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4th IEEE international symposium on object-oriented real-time computing (ISORC 2001)

作者： Hrustich, C Objective Interface Systems United States

ISBN: (纸本)0769510892

The development of distributed systems software poses unique challenges due to the diversity of hardware, software, and network protocols on the market today. Achieving interoperability with legacy systems and between systems provided by different vendors has, in the past, required the development of intricate interface specifications or proprietary bridging software. real-time, embedded distributed systems introduce additional performance and resource requirements. real-time systems require the ability to schedule tasks, predict the performance of those tasks, and perhaps most important, predict how the system will react to an overload situation or resource failure. Embedded systems are often characterized by resource constraints, diverse operating systems, and non-TCP/IP transports. Most real-time and/or embedded systems share the requirement of reasonably, high performance. High performance systems seek the lowest possible communication overhead and streamlined, optimized software layers. This paper discusses how CORBA has evolved to meet all these requirements, and uses ORBexpress CORBA from objective Interface as a reference implementation of real-time, high performance CORBA for embedded developers.

关键词： Common object request broker architecture (CORBA)

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OASIS: An architecture for dynamic instrumentation of enterprise distributed real-time and embedded systems

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COMPUTER SYSTEMS SCIENCE AND ENGINEERING 2011年第6期26卷 413-423页

作者： Hill, James Sutherlandy, Hunt Staudingery, Paul Silveriaz, Thomas Schmidtx, Douglas C. Slabyz, John Visnevskiy, Nikita Indiana Univ Purdue Univ Indianapolis IN 46202 USA GE Global Res Niskayuna Niskayuna NY USA Vanderbilt Univ Nashville Nashville TN USA

Instrumentation is a critical part of evaluating an enterprise distributed real-time and embedded (DRE) system's performance. Traditional techniques for instrumenting enterprise DRE systems require DRE system developers to make design decisions regarding what metrics to collect during early phases of the software lifecycle so these needs can be factored into the system architecture. In many circumstances, however, it is hard for DRE system developers to know this information during early phases of the software lifecycle-especially when metrics come from many heterogeneous sources (such as application-and system-level hardware and software resources) and evaluating performance is traditionally an after-thought. To address these issues, this article presents the design and performance of OASIS, which is SOA-based middleware and tools that dynamically instruments enterprise DRE system without requiring design-time knowledge of which metrics to collect. This article also empirically evaluates OASIS in the context of a representative enterprise DRE system case study from the domain of shipboard computing. Results from applying OASIS to this case study show that its flexibility enables DRE system testers to precisely control instrumentation overhead. We also highlight open challenges in dynamic instrumentation for next-generation enterprise DRE systems.

关键词： dynamic instrumentation enterprise DRE systems service-oriented architecture middleware real-time instrumentation

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A profile for safety critical Java

A profile for safety critical Java

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10th IEEE international symposium on object and Component-oriented real-time distributed computing

作者： Schoeberl, Martin Sondergaard, Hans Thomsen, Bent Ravn, Anders P. Vienna Univ Technol Inst Comp Engn A-1040 Vienna Austria Vitus Bering Denmark Univ Coll DK-8700 Horsens Denmark Aalborg Univ Dept Comp Sci DK-9220 Aalborg Denmark

ISBN: (纸本)9780769527659

We propose a new, minimal specification for real-time Java,for safety critical applications. The intention is to provide a profile that supports programming of applications that can be validated against safety critical standards such as DO-178B[15]. The proposed profile is in line with the Java specification request JSR-302: Safety Critical Java Technology, which is still under discussion. In contrast to the current direction of the expert group for the JSR-302 we do not subset the rather complex real-time Specification for Java (RTSJ). Nevertheless, our profile can be implemented on top of an RTSJ compliant JVM.

关键词： object oriented programming

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