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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1151-1160 订阅

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Analysis of guaranteed service times of distributed real-time objects

Analysis of guaranteed service times of distributed real-tim...

引用

international symposium on object-oriented real-time distributed computing

作者： K.H. Kim University of California Irvine CA USA

As the demands for real time distributed systems increase, the need for programming tools useful in development of such application systems is becoming increasingly acute. An issue that the research community has long recognized as an important technological challenge but has not shown much progress in meeting the challenge is to guarantee response times of real time distributed systems. Two basic problems must be solved to effectively meet this challenge: (1) to establish the distributed real time program structure and the system infrastructure structure, i.e., the structure of the operating system (OS) and the communication infrastructure, that enable systematic analysis of the worst case time behavior of the application systems; and (2) to establish a tool which performs automated analysis of the worst case time behavior while leaving only minimal work to the designers. The problem area (1) has been recognized as a research area for a long time, but only in recent years has the skeleton of a usable technical foundation started emerging. In other words, there has long been a lack of fully general and yet easily analyzable distributed real time program structures and also a lack of useful OS timing models. However, on the basis of the skeleton emerged, rapid progress is expected in the future toward establishment of a full technical foundation. Therefore, the time seems ripe for launching new larger scale attacks on problem (2) on the basis of those recent developments in handling problem (1).

关键词： Timing real time systems Delay Performance analysis Skeleton distributed computing System testing Middleware Local area networks Operating systems

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Proceedings - international Conference on Software Methods and Tools, SMT 2000

Proceedings - International Conference on Software Methods a...

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international Conference on Software Methods and Tools, SMT 2000

ISBN: (纸本)0769509037

The proceedings contain 27 papers. The topics discussed include: software tools: past, present, and future;object-oriented methods and processes;business case to architecture in large real time systems;directions in modeling large-scale software architectures;a study of usability of web-based software repositories;security characterization and integrity assurance for component-based software;viable components: a cybernetic organization for computing;meta-component architecture for software interoperability;towards implementing successful software inspections;a software component verification tool;a two-level architecture for semantic protection of persistent distributed objects;and experience with designing a requirements and architecture management tool.

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MOSYS: a methodology for automatic object identification from system specification

MOSYS: a methodology for automatic object identification fro...

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international symposium on object-oriented real-time distributed computing

作者： L.B. Becker C.E. Pereira O.P. Dias I.M. Teixeira J.P. Teixeira UFRGS Porto Alegre Brazil Institute Pol. Setubal EST INESC Portugal Elec. Engineering Department UFRGS Brazil

The paper presents a novel approach to the automatic identification of objects/classes from a system specification. The methodology is aimed at the development of distributed real time systems (DRTS), especially those conceived for industrial automation applications. UML is used as the modeling language in conjunction with an extended version of traditional DFD (E-DFD), that conveys information on flow type (data or control) and on process complexity and timing constraints. E-DFDs are mapped into a graph and a tool is used to carry out an automatic graph partition, which allows the identification of a set of objects that constitute, from the design and test points of view, the 'best-fitted' architecture. To validate the proposed methodology, a case study is presented and analyzed, comparing two design strategies.

关键词： Design for disassembly Computer architecture Electrical capacitance tomography real time systems Automation Unified modeling language Timing Automatic testing System analysis and design Costs

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Load balancing to improve dependability and performance for program objects in distributed real-time co-operation over the Internet

Load balancing to improve dependability and performance for ...

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international symposium on object-oriented real-time distributed computing

作者： A.K.Y. Wong T.S. Dillon Department of Computing Hong Kong Polytechnic University Hong Kong China

The aim of this project is to improve the fault-tolerant data communication setup that we proposed previously. From the verification tests for this setup, which integrates two basic schemes, we observed that performance could be very sluggish sometimes, due to time constraints imposed by problematic routing among communicating objects and possible message retransmissions. These constraints, if not relaxed, would restrict the possibility of building useful object-based real-time systems over the Internet. The two schemes in the extant setup are namely (a) consecutive message transmissions to improve the communication reliability, and (b) adaptive buffer management to prevent message losses at the reception side due to buffer overflow. Careful analyses of the previous test data have revealed that inclusion of load balancing would make the setup more responsive. With this motivation in mind, a load-balancing model is proposed in this paper. The different experiments in this project involved both local and remote Internet sites. The preliminary test results indicate that the proposed load balancing scheme can indeed enhance system responsiveness by relaxing time constraints. Therefore, further work and deeper investigations in the same direction are worthwhile.

关键词： Load management Testing time factors Internet Fault tolerance Data communication Routing real time systems Propagation losses Buffer overflow

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A semantics of UML state-machines using synchronous pre-order transition systems

A semantics of UML state-machines using synchronous pre-orde...

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international symposium on object-oriented real-time distributed computing

作者： Yunming Wang J.-P. Talpin A. Benveniste P. Le Guernic Campus de Beaulieu INRIA IRISA Rennes France

The synchronous model of concurrency has demonstrated its practicality for the design of circuits, embedded systems, reactive and distributed systems. This model allows to design systems around an idealized notion of deterministic concurrency, which is much easier to deal with than classical, nondeterministic, asynchronous concurrency. Compiling, optimizing, and verifying programs are done using powerful techniques. We take advantage of this rich background by presenting a translation of UML state-machines into a pivot synchronous calculus, based on mathematical notions of pre-orders, in the aim of providing an integrated development cycle for the reliable deployment of synchronous system specifications over asynchronous networks. In this paper we first present the structure of UML state-machines. Compared with earlier studies on that matter the structure under consideration supports, e.g., composite transition and history. Then, we give a brief presentation of the pivot formalism, BDL, which is used to finally give a formal semantics of UML state-machines in terms of pre-ordered transition systems.

关键词： Unified modeling language Concurrent computing Computer architecture object oriented modeling Circuits Mathematics Ear History Design engineering Systems engineering and theory

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Adlets migration and handling in a distributed object environment

Adlets migration and handling in a distributed object enviro...

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international symposium on object-oriented real-time distributed computing

作者： H.I. Gharib Ping-Wen Chen Y. Kawata Shi-Kuo Chang Department of Computer Science University of Pittsburgh Pittsburgh PA USA

Large distributed systems may contain millions of objects that have to be managed. This makes it impossible to specify management policies for individual objects. Instead it is necessary to specify policy for groups of objects. This paper describes a framework for the construction of the ADlets distributed Migration Mechanism (ADDMM), which is used by the Adlet System for the management of adlets. The Adlet System is a new approach for multimedia information retrieval and fusion based on the concept of active document advertising, whereby an adlet (the metadata of a document) travels in the network to seek out documents of interest to the parent document, and at the same time advertises its parent document to other interested adlets. ADDMM provides the Adlet System with the facility of managing migrating adlets. ADDMM supports location-independent transparency and minimal interface by utilizing the ADDNS naming system that provides a mechanism for transparent naming and locating adlets, which in turn supports ADDMM transparency at the adlet access level. With the ADDMM migration mechanism, various adlet migration protocols can be constructed and deployed. A visual diagram is introduced to specify such protocols for adlets migration, which can also be employed to specify distributed object management policies.

关键词： Electrical capacitance tomography Information retrieval Multimedia systems Advertising Databases Identity-based encryption Remotely operated vehicles Access protocols Data structures Manipulator dynamics

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Integrating QoS to collaborative distributed virtual reality applications

Integrating QoS to collaborative distributed virtual reality...

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international symposium on object-oriented real-time distributed computing

作者： Z. Choukair D. Retailleau ENST Bretagne Department Informatique Technopóle Brest Iroise Brest France

Today's virtual environments are expected to be distributed to allow collaboration for common purposes. However, they must ensure a high level of quality of service (QoS) to the user, especially in an open context with unknown, a priori, man-in-the-loop event occurrence. This paper presents our distributed Virtual Environment COllaboration Model (DVECOM) and its implementation which aims to provide an end-user QoS support for distributed virtual reality applications. The idea of DVECOM is to guarantee full consistency and soft synchronization of the virtual world distributed displays, with the least rendering degradation possible, and also to auto-adapt the rendering in accordance with the retained strategy, ensuring best effort and least suffering for virtual world rendering. This representation degradation is driven by the users' choices. The receiver-side protocol is based upon the end-user preferences, physical level capability information, as well as the pertinence of the notification to each client (contextual end-user information). When available, such guarantees would make it possible to use DVE out of a closed, oversized, very restricted context for industrial collaborative applications with an expected QoS.

关键词： Collaboration Virtual reality Collaborative work Quality of service Virtual environment Degradation Computer aided manufacturing CADCAM Internet Adaptive systems

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Resource-conscious customization of CORBA for CAN-based distributed embedded systems

Resource-conscious customization of CORBA for CAN-based dist...

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international symposium on object-oriented real-time distributed computing

作者： Kimoon Kim Gwangil Geon Seongsoo Hong Sunil Kim Taehyung Kim Sch. of Electr. Eng. Seoul Nat. Univ. South Korea Electrical Engineering and ERC-ACI Seoul National University Seoul South Korea Department of Computer Science and Engineering Hanyang University Ansan Kyunggi South Korea

While recently emerging middleware technologies such as CORBA and DCOM address the complexity of distributed programming, they cannot be directly applied to distributed control system design due to their excessive resource demand and inadequate communication models. We propose a new CORBA design for CAN-based distributed embedded control systems. Our design goal is to minimize its resource need and make it support group communication without losing the IDL (interface definition language) level compliance to the OMG standards. To achieve this, we develop a transport protocol on the CAN and a group communication scheme based on the well-known publisher/subscriber model. The protocol effectively realizes subject-based addressing and supports anonymous publisher/subscriber communication. We also customize the method invocation and message passing protocol, referred to as the general inter-ORB protocol (GIOP), of CORBA so that CORBA method invocations are efficiently serviced on a low-bandwidth network such as the CAN. This customization includes packed data encoding and variable-length integer encoding for compact representation of IDL data types. The new CORBA design clearly demonstrates that it is feasible to use CORBA in developing distributed embedded systems on real-time networks possessing severe resource limitations.

关键词： distributed control Encoding Middleware Communication system control Control systems Communication standards Transport protocols Message passing Embedded system real time systems

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object-oriented real-time distributed programming and support middleware

Object-oriented real-time distributed programming and suppor...

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international Conference on Parallel and distributed Systems (ICPADS)

作者： K.H. Kim University of California Irvine CA USA

The object oriented (OO) distributed real time (RT) programming movement started in the 1990s and is growing rapidly at this turn of this century (year 2000). The motivations are reviewed and then a brief overview is given of the particular programming scheme which the author and his collaborators have been establishing. The scheme is called the time triggered message triggered object (TMO) programming scheme and it is used to make specific illustrations of the issues and potentials of OO RT programming. The desirable features of middleware providing execution support for OO RT distributed programs are then discussed. The issue of fault tolerant execution of distributed RT objects and that of RT distributed/parallel simulation are also discussed.

关键词： object oriented programming Middleware Application software Computational modeling Software engineering Fault tolerance object oriented modeling Quantum computing Computer applications distributed computing

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Provisioning QoS in real-time distributed object architectures for power plant control applications

Provisioning QoS in real-time distributed object architectur...

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international symposium on distributed objects and Applications

作者： L. Bacon E. Becquet E. Gressier-Soudan C. Lizzi C. Loge L. Reveilleau EDF Research and Development/EP/CCC Chatou France CEDRIC-CNAM Paris France Laboratoire LaRIA Amiens France

This work is a case study. We describe how we are provisioning QoS in a real-time distributed object platform dedicated to power plant control applications. A previous experiment based on a modified Java-ChorusOS-ATM platform enhanced our knowledge on QoS based distributed object systems. We used RM-ODP/ReTINA as a distributed computing object model where time requirements are specified in terms of QoS parameters. Our goal is to achieve QoS provisioning with off-the-shelf QoS based products in real-time distributed object architectures to be built. Low level building blocks of the architecture as communication networks and operating systems exist as QoS components. The current step of the project deals with distributed object platform selection. It is not so easy to choose a QoS-enabled off-the-shelf middleware.

关键词： Power generation Quality of service Operating systems Retina Computer architecture real time systems Middleware Delay Protocols Java

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