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检索条件"任意字段=International Symposium on Object-Oriented Real-Time Distributed Computing"

共 1423 条记录，以下是951-960 订阅

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An approach to object-oriented component customization for real-time software development

An approach to object-oriented component customization for r...

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international symposium on object-oriented real-time distributed computing

作者： S.S. Yau C. Taweponsomkiat Dept. of Comput. Sci. & Eng. Arizona State Univ. Tempe AZ USA Computer Science and Engineering Department Arizona State University Tempe USA Computer Science and Engineering Department Ari ona State niversity Tempe

To reuse components in component-based real-time software development, especially the ones acquired from external sources, a component must satisfy its real-time constraints, such as thread priority and thread synchronization, to satisfy system real-time requirements. Since real-time applications have various real-time requirements, the ability to customize components for various real-time constraints is needed. Hence, the components to be used in real-time software development must have a set of well-defined features to facilitate component customization. Furthermore, since there are many techniques available for addressing real-time requirements, the features themselves must also be customizable to support these techniques used in a particular type of real-time applications. In this paper, an object-oriented component customization approach, including component customization and framework extension, for real-time applications software development, is presented.

关键词： Programming real time systems Yarn Application software Scheduling algorithm Middleware Computer science Software reusability Productivity object oriented modeling

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distributed real-time computing for microcontrollers-the OSA+ approach

Distributed real-time computing for microcontrollers-the OSA...

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international symposium on object-oriented real-time distributed computing

作者： U. Brinkschulte A. Bechina F. Picioroaga E. Schneider IPR Institute for Pricess Control University of Karlsruhe Germany

New applications introducing restrictions in power consumption, heat, costs and available space are leading to small microcontrollers becoming increasingly important in distributed real-time systems. Traditional real-time middleware architectures are insufficient for these small devices. The paper presents an ongoing approach of constructing middleware for small devices by adapting the microkernel concept from operating systems to middleware. This middleware called OSA+ is service oriented and consists of a small core, basic-, extension-, and user-services. The core provides only restricted functionality, while the basic and extension services adapt and scale the system according to the application environment. A first (quick and non-optimal) prototype implementation offers a core size of about 60 kBytes and an average size of about 10 kBytes for a basic service. We consider this as a basis for further optimizations leading to yet smaller sizes.

关键词： distributed computing Middleware Space heating Energy consumption Costs Microcontrollers real time systems Computer architecture Operating systems Prototypes

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distributed real-time simulation of the group manager executing the multicast protocol RFRM

Distributed real-time simulation of the group manager execut...

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international symposium on object-oriented real-time distributed computing

作者： Y.S. Hong T.G. Kim Dongguk University Seoul South Korea

Group communication in real-time computing systems is useful for building fault-tolerant distributed real-time applications. The purpose of this paper is to show the efficiency of the group membership manager executing the multicast protocol RFRM (Release-time based Fault-tolerant real-time Multicast) which is based on the idea of attaching the official release time to each group view send message. In this approach, the group membership manager interacts with the fault detector and the client application do not send view-ack messages to the group membership manager. A real-time simulation based on the TMO structuring scheme is conducted to study its performance for both the proposed approach and the group management scheme which receives view-ack messages. Simulation results show that with a proper value of the official release time interval, our approach improves the delay in completing the group view change event.

关键词： real time systems Multicast protocols Computational modeling distributed computing Fault tolerant systems Fault tolerance Joining processes Fault detection Discrete event simulation Delay effects

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Addressing dynamic dispatching issues in WCET analysis for object-oriented hard real-time systems

Addressing dynamic dispatching issues in WCET analysis for o...

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international symposium on object-oriented real-time distributed computing

作者： E.Y.-S. Hu G. Bernat A. Wellings EPSRC UK Real Time Systems Research Group Department of Computer Science University of York York UK

There is a trend towards using object-oriented programming languages to develop hard real-time applications. However some object-oriented features, such as dynamic dispatching and dynamic loading, are prohibited from being used in hard realtime systems because they are either unpredictable and/or un-analysable. Arguably, these restrictions could make applications very limited and unrealistic since they could eliminate the major advantages of object-oriented programming. This paper demonstrates how we can address the dynamic dispatching issues in Worst-Case Execution Timing (WCET) analysis with minimum annotations. The major contributions include: discussing the major issues involved in using and restricting dynamic binding features; weakening the restriction of using dynamic dispatching; presenting how to estimate tighter and safer WCET value in object-oriented hard real-time systems. Our approach shows that allowing the use of dynamic dispatching can not only provide a more flexible way to develop object-oriented hard real-time applications, but also does not necessarily result in unpredictable timing analysis.

关键词： Dispatching real time systems Timing Java Computer science Application software Electronic switching systems Yarn Scheduling algorithm Algorithm design and analysis

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Practical considerations in making CORBA services fault-tolerant

Practical considerations in making CORBA services fault-tole...

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international symposium on object-oriented real-time distributed computing

作者： P. Narasimhan Institute of Software Research International School of Computer Science Carnegie Mellon University Pittsburgh PA USA

This paper examines the CORBA Naming, Event, Notification, Trading, time and Security Services, with the objective of identifying the issues that must be addressed in order make these services fault-tolerant. The reliability considerations for each of these services involves strategies for replicating the service objects, and for keeping the states of the replicas consistent. Of particular interest are the sources of non-determinism in each of these services, along with the means for addressing the non-deterministic behavior in the interests of ensuring strong fault tolerance.

关键词： Fault tolerance distributed computing Computer languages Computer science Computer security Fault diagnosis Network servers Computer architecture Program processors Java

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TMO-Linux: a Linux-based real-time operating system supporting execution of TMOs

TMO-Linux: a Linux-based real-time operating system supporti...

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international symposium on object-oriented real-time distributed computing

作者： Hyun-Jun Kim Sang-Hyun Park Jung-Guk Kim Moon-Hae Kim Kee-Wook Rim Hankuk University of Foreign studies South Korea Konkuk University South Korea Sunmoon University South Korea

The TMO (time-triggered message-triggered object) model is a well-known real-time object model for distributed and timeliness-guaranteed computing. We developed two TMO execution engines, named WTMOS and LTMOS, the former is for Windows platforms and the latter is for Linux platforms. Those are middleware engines supporting deadline driven real-time execution of TMO methods and distributed IPC. The engines have several advantages such as heterogeneous computing support, flexibility, and high portability. However, the deadline-driven schedulers of the middlewares lose temporal accuracy in some cases because the scheduling is performed by controlling priorities of real-time threads. To increase temporal accuracy and reduce overhead by middlewares, we developed a new Linux-based operating system named "TMO-Linux" that supports distributed real-time execution of TMO instances as embedded services of an operating system. In this paper, we present the functions and structure of TMO-Linux. Our preliminary experimental results show that TMO-Linux has better timing accuracy and performance than the middleware engines.

关键词： real time systems Operating systems Engines Middleware Processor scheduling distributed computing Linux Yarn Timing Accuracy

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Integrating real-time synchronization schemes into preemption threshold scheduling

Integrating real-time synchronization schemes into preemptio...

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international symposium on object-oriented real-time distributed computing

作者： Saehwa Kim Seongsoo Hong Tae-Hyung Kim School of Electrical Engineering and Computer Science Seoul National University Seoul South Korea Department of Computer Science and Engineering Hanyang University Ansan Gyeonggi South Korea

Preemption threshold scheduling (PTS) provides prominent benefits for fixed priority scheduling such as increased schedulability, reduced context switches, and decreased memory requirements. Since such benefits allow for scalable real-time system design, we have adopted it into our automatic implementation synthesis method for real-time object-oriented models. In this paper, we present the integration of real-time synchronization schemes into PTS. Specifically, we investigate how to integrate priority inheritance protocols into preemption threshold scheduling such as the basic priority inheritance protocol and the priority ceiling protocol. In our integrated schemes, (1) the preemption threshold, instead of the priority, of a blocked task is inherited when blocking occurs; and (2) priority ceiling, instead of preemption threshold ceiling is used. We also show that our integrated schemes can minimize worst-case context switches and thus is appropriate for the implementation of real-time object-oriented design models.

关键词： Processor scheduling real time systems object oriented modeling Protocols Timing Switches Performance analysis Computer science Application software Design methodology

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Unreliable distributed timing scrutinizer: adapting asynchronous algorithms to the environment

Unreliable distributed timing scrutinizer: adapting asynchro...

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international symposium on object-oriented real-time distributed computing

作者： E. Anceaume E. Mourgaya IRISA Rennes France

We present an unreliable distributed timing scrutinizer (UDTS). This mechanism captures the state of the network and, based on its observation, estimates the waiting time that maximizes the efficiency of a round-based protocol regarding the number and/or the duration of its computational rounds. An UDTS is not an abstract oracle, it is implementable and reveals the properties of the network. We illustrate our approach by addressing the consensus problem in asynchronous distributed systems equipped with an unreliable distributed timing scrutinizer. The proposed protocol is conceptually simple. It benefits from the UDTS predictions to implement different convergence and decision conditions. This allows the protocol to be efficient in number and/or duration of rounds for stable networks.

关键词： Timing Protocols Computational modeling Robustness Costs State estimation Computer networks Convergence Upper bound Process design

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IKE 2-implementing the stateful distributed object paradigm

IKE 2-implementing the stateful distributed object paradigm

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international symposium on object-oriented real-time distributed computing

作者： J.R. Noseworthy Object Sciences Corporation

This paper describes IKE 2, distributed object computing middleware that supports the creation of interoperable realtime distributed applications. These applications appear in many domains, such as telecom, aerospace, military testing and training ranges, and financial services. IKE 2 combines the concepts of CORBA distributed objects and anonymous publish-subscribe data dissemination to provide a programming abstraction known as a stateful distributed object (SDO). Every SDO can have both a remote method interface and publication state. The remote method interface allows client applications to invoke methods on target objects efficiently without concern for their location, programming language, OS platform, communication protocols and interconnects, or hardware. The publication state of a given SDO is disseminated to applications that have expressed their interest by subscribing to certain characteristics, such as the type of the SDO. Subscribers can read the publication state of an SDO as if it were a local object. The SDOs provided by the IKE 2 metaobject model support inheritance from other SDOs, containment of other SDOs, and references to other SDOS. IKE 2 is implemented in C++. The API relies heavily on compile-time type-safety to help ensure reliable behavior at runtime-a critical feature of any real-time system. Automatic code generation is used to provide the high-level abstractions without unduly burdening application programmers.

关键词： Military computing Aerospace testing distributed computing Telecommunication computing Middleware Military communication Publish-subscribe Computer languages Protocols LAN interconnection

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realization of a distributed OS component for internal clock synchronization in a LAN environment

Realization of a distributed OS component for internal clock...

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international symposium on object-oriented real-time distributed computing

作者： K.H.K. Kim C. Im P. Athreya University of California Irvine CA USA

A key challenge in keeping distributed clocks well synchronized in a LAN environment via OS-or middleware-level mechanisms is to create an interference-free condition in a network channel(s) and a nonpreemptible on-alert condition in the responsible thread in each node during each resynchronization round while keeping the length of each round as short as possible. An approach for meeting this challenge which is based on the middleware architecture TMOSM, has been presented. A prototype implementation and its measurements indicated that with a typical network of PCs connected via a 10 Mbps Ethernet, the PC nodes can be kept synchronized within the deviation bound of 0.5 milliseconds. The organizing principle is believed to be applicable to many real-time OSs or middleware used to support distributed computing applications.

关键词： Clocks Synchronization Middleware Local area networks Interference Yarn Prototypes Personal communication networks Ethernet networks Organizing

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