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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1001-1010 订阅

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The Java Fieldbus Control Framework -: object oriented control of fieldbus devices 4

The Java Fieldbus Control Framework -: Object oriented contr...

引用

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

作者： Bühler, D Nusser, G Küchlin, W Gruhler, G Univ Tubingen Dept Comp Sci Symbol Computat Grp D-72076 Tubingen Germany

ISBN: (纸本)0769510892

In this paper we present the Java Fieldbus Control Framework (JFCF) which provides an object oriented programming framework for the rapid creation of concurrent control tasks for fieldbus-based automation systems. Our framework is implemented in Java which is going to become more popular in the field of industrial control, due to the advent of dedicated Java real-time systems and the real-time Specification for Java (RTSJ). We further describe an example application built within our framework consisting of an open Java control for a CANopen automation system featuring a SCARA robot arm, a transfer system and further peripheral fieldbus devices. Four independent tasks run concurrently to establish the overall automation process. In order to meet real-time requirements, the framework will be extended to comply to the RTSJ in the future. The reusability of object oriented software and the portability of Java code results in a reduction of costs for software creation and maintenance.

关键词： real time systems

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Design and implementation of distributed object-oriented infrastructures for networked home appliances on commodity operating systems 4

Design and implementation of distributed object-oriented inf...

引用

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

作者： Nakajima, T Soejima, K Matsuda, M Iino, T Hayashi, T Waseda Univ Dept Informat & Comp Sci Tokyo 1698555 Japan

ISBN: (纸本)0769510892

In this paper, we describe our currently ongoing work to build object-oriented distributed middleware for networked home appliances, which are executed on commodity operating systems. The current prototype has adopted HAVi(Home Audio/Video Interoperability) as distributed middleware for home appliances. We have implemented HAVi in Java, and has adopted Linux as an operating system. Since Java and Linux axe running on a variety of platforms, our software can be ported to a target system without modification. Therefore, it becomes easy to develop a new application on a standard PC platform. The paper describes the design issues and the implementation of our system. We have actually implemented several programs that emulate home appliances such as a digital television. Also, we present some experiences with the current prototype.

关键词： Domestic appliances

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object-orientation in parallel VSIPL architecture 4

Object-orientation in parallel VSIPL architecture

引用

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

作者： Sheynin, Y Novoselova, A St Petersburg State Univ Aerosp Instrumentat Dept Comp Syst & Networks St Petersburg 190000 Russia

ISBN: (纸本)0769510892

object-oriented programming is a popular approach for modem software design in many fields. However, OOP extension for embedded parallel processing still has conceptual and practical problems. The paper considers concepts of merging OOP with parallel processing. Process-centric view of parallel OOP is presented. The VSIPL signal and image processing library standard is an example. Concepts of Parallel VSIPL with OOP features are proposed. They are based on shared-data rather then message-passing paradigm, on Asynchronous Growing Processes formal model of parallel computations and Shared Data object Interface (SDOI) middleware.

关键词： object oriented programming

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

CORBA for real-time, high performance and embedded systems

引用

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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In search of commercial off-the-shelf, hard real-time, distributed object computing middleware 3

In search of commercial off-the-shelf, hard real-time, distr...

引用

3rd international symposium on distributed objects and Applications

作者： Thaker, GH Lardieri, PJ Lockheed Martin Advanced Technology Laboratories United States

ISBN: (纸本)076951300X

Numerous technical and life cycle cost consideration trends have led to a large increase in the use of commercial, off the shelf (COTS) computing and networking infrastructure in military command and control (C2) applications. object oriented (OO) real-time middleware, such as RT CORBA, provides the capabilities required for domain specific services and applications. However, it is unproven whether such commercial technologies can achieve the hard real time performance required by many C2 system. Our study reveals that DOC middleware is suitable for some real-time applications when appropriately coupled with operating system and network protocol quality of service (QoS) mechanisms areas in which further progress is still needed.

关键词： Middleware

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Developing simulation models of open distributed control system by using object-oriented structual and behavioral patterns 4

Developing simulation models of open distributed control sys...

引用

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

作者： Tomura, T Uehiro, K Kanai, S Yamamoto, S Asahikawa Natl Coll Technol Asahikawa Hokkaido Japan

ISBN: (纸本)0769510892

An open distributed control system (DCS), which consists of many devices and an open network interconnecting them, is now used in many automation areas. For assuring the control performance under the heavy traffic on the network, the simulation of a DCS is strongly needed. For this purpose, we propose an object-oriented design pattern approach as a uniform, efficient and accurate method of modeling and simulating a DCS. Four design patterns are newly proposed. Device-Constructor and Composite-Device-Constructor patterns describe classes and mechanisms for uniformly structuring device models composed of many kinds of sensors and actuators. Statechart pattern defines classes and the state-transition execution mechanism for realizing the behavior of sensors and actuators in a device. While Event-Chain pattern defines classes and the event dispatching mechanism among sensors and actuators intra-device and inter-device. The systematic implementation procedures from these patterns to the executable Java code of the DCS simulation model are also discussed. Finally, the effectiveness of our approach was proved by developing the Java-based DCS modeler and simulator used in building automation area.

关键词： distributed parameter control systems

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An adaptive buffer management algorithm for enhancing dependability and performance in mobile-object-based real-time computing 4

An adaptive buffer management algorithm for enhancing depend...

引用

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

作者： Ip, MTW Lin, WWK Wong, AKY Dillon, TS Wang, DH Hong Kong Polytech Univ Dept Comp Kowloon Hong Kong Peoples R China

ISBN: (纸本)0769510892

In an ORC (object-oriented real-time computing) environment, it is important to reduce message retransmissions during message passing because these retransmissions cause significant time delay. And, this makes it difficult to achieve the necessary timeliness. A cause of retransmission is message loss due to buffer overflow at the reception side. Here a P+I+D (P for proportional, I for integral and D for derivative) adaptive buffer control algorithm is proposed to prevent such possible overflow. The I control depends on the Convergence Algorithm (CA), which is a stable and efficient IEPM (Internet End-to-End Performance Measurement) toot that predicts the mean message roundtrip time (RTT) of a communication channel quickly and accurately,. The P+I+D algorithm was tested under different conditions in a mobile ORC (MORC) environment, where mobile agents collaborate freely over the Internet. The different test results confirm that the proposed P+I+D approach is indeed effective for preventing buffer overflow.

关键词： MORC buffer overflow P plus I plus D control algorithm adaptive Convergence Algorithm

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Performance evaluation of a fault-tolerant mechanism based on replicated distributed objects for CORBA 4

Performance evaluation of a fault-tolerant mechanism based o...

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

作者： Takemoto, M Nakamura, T NTT Network Innovat Labs Musashino Tokyo Japan

ISBN: (纸本)0769510892

For future applications, it is important to develop Systems using small objects. Such systems must be able to provide uninterrupted services even when some small objects stop. Replicating such objects is one way to do this. However introducing some type of redundancy into systems generally adds some overhead. Our proposed model reduces this overhead. It is implemented with multi-threaded execution for applications in actual systems. We measured the performance of an implementation for applications connected to databases. The results show that the overhead for ordinary execution and the time required to switch the replicas are both acceptably small. This technique will therefore play an important role in future systems.

关键词： Common object request broker architecture (CORBA)

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JTRON: A hybrid architecture integrating an object-oriented and real-time system 4

JTRON: A hybrid architecture integrating an object-oriented ...

引用

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

作者： Nakamoto, Y Hachiya, S NEC Networks Dev Labs Minato Ku Tokyo 1080023 Japan

ISBN: (纸本)0769510892

Though Java is expected to have a wide range of embedded applications, there exist some problems in applying Java to real-time systems. The hybrid architecture, in which the Java runtime environment is implemented on a real-time OS, parts of the application requiring real-time properties are implemented on the real-time OS, and parts of the application requiring GUI features, extension of features, and replacing of programs should be implemented on the Java runtime environment, is practical. In this paper, we present interface specifications between Java threads and real-time tasks based the hybrid architecture we build, called JTRON specification, and experiences based on application development using its implementation. First, cooperative computation models between Java threads and realtime tasks in the architecture are described. Based on these models, we categorize three types of communication interface between Java threads and real-time tasks: real-time OS attach class, shared object with explicit locking mechanism, and stream-based communication. By standardizing the interface, not only the Java program, but also the real-time program becomes portable and reusable. Two of the three types of the interface can be applied to other real-time OSes also.

关键词： real-time OS Java cooperative computation model multi-processor system

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Developing a triggering system for real-time databases in distributed environment 4

Developing a triggering system for real-time databases in di...

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

作者： Yoon, HS Han, H Kim, YK Jin, SI Chungnam Natl Univ Dept Comp Sci Taejon 305764 South Korea

ISBN: (纸本)0769510892

MMDB(Main Memory-resident DataBase) systems have been used for real-time applications, such as a stock market and an auction system, which require fast response time and predictable behavior. However, most existing MMDB systems do not support active functionalities. Also, the trigger capability which is specified in SQL3 and implemented in some conventional DBMSs provides only an extremely limited form of active functions. This paper proposes a scheme to add active capabilities to existing MMDB without modifying the kernel. Generally, active functions can be classified into event-triggered active functions, such as decision of buying or selling point according to the state of database, and time-triggered active functions, such as periodic updates of stock prices, which are frequently used in real-time applications. The proposed scheme is designed to provide both kinds of active functions for MMDB by putting a time manager which checks an absolute time for a time trigger and an SQL processing module which provides an event trigger.

关键词： Financial markets

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