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检索条件"任意字段=9th IEEE International Symposium on Object and Component-Oriented Real-Time Distributed Computing"

共 393 条记录，以下是311-320 订阅

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QoS management of real-time data stream queries in distributed environments

QoS management of real-time data stream queries in distribut...

引用

10th ieee international symposium on object and component-oriented real-time distributed computing

作者： Wei, Yuan Prasad, Vibha Son, Sang H. Univ Virginia Dept Comp Sci Charlottesville VA 22904 USA

ISBN: (纸本)9780769527659

Many emerging applications operate on continuous unbounded data streams and need real-time data services. Providing deadline guarantees for queries over dynamic data streams is a challenging problem due to bursty stream rates and time-varying contents. this paper presents a prediction-based QoS management scheme for real-time data stream query processing in distributed environments. the prediction-based QoS management scheme features query workload estimators, which predict the query workload using execution time profiling and input data sampling. In this paper, we apply the prediction-based technique to select the proper propagation schemes for data streams and intermediate query results in distributed environments. the performance study demonstrates that the proposed solution tolerates dramatic workload fluctuations and saves significant amounts of CPU time and network bandwidth with little overhead.

关键词： Information management

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Combining model processing and middleware configuration for building distributed high-integrity systems

Combining model processing and middleware configuration for ...

引用

10th ieee international symposium on object and component-oriented real-time distributed computing

作者： Hughes, Jerome Zalila, Bechir Pautet, Laurent Telecom Paris GET LTCI UMR 5141CNRS 46Rue Barrault F-75634 Paris 13 France

ISBN: (纸本)9780769527659

Requirements of High Integrity systems now encompass distribution mechanisms along with strong functional and non-functional features (run-time support for hardware, dependability, safety, analyzability). In this paper, we show how model processing help addressing such needs. We present a generic distribution model suitable for High Integrity systems, and demonstrate how a high-level modeling deployment view allows one to greatly reduce the model complexity. Finally, we conclude by assessing a case study.

关键词： Requirements engineering

来源：评论

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A component-based methodology to design arbitrary failure detectors for distributed Protocols

A component-based methodology to design arbitrary failure de...

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10th ieee international symposium on object and component-oriented real-time distributed computing

作者： Baldoni, Roberto Helary, Jean-Michel Piergiovanni, Sara Tucci Univ Roma La Sapienza Dip Informat & Sistemat Antonio Ruberti Rome Italy Univ Rennes F-35042 Rennes France

ISBN: (纸本)9780769527659

Nowadays, there are many protocols able to cope with process crashes, but, unfortunately, a process crash represents only a particular faulty behavior. Handling tougher failures (e.g. sending omission failures, receive omission failures, arbitrary failures) is a real practical challenge due to malicious attacks or unexpected software errors. this paper proposes a component-based methodology allowing to take a protocol A resilient to crash failures and to add software components, namely liveness and safety failure detectors, in order to adapt the protocol A to be resilient to more general failures than crashes, without changing the code of A.. then, the feasibility of this approach is shown, by providing an implementation of liveness failure detectors and of safer failure detectors for a protocol solving the problem of global data computation.

关键词： distributed computer systems

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An aspect-oriented approach for dealing with non-functional requirements in a model-driven development of distributed embedded real-time systems

An aspect-oriented approach for dealing with non-functional ...

引用

10th ieee international symposium on object and component-oriented real-time distributed computing

作者： Wehrmeister, Marco A. Freitas, Edison P. Pereira, Carlos E. Wagner, Flavio R. Univ Fed Rio Grande do Sul Inst Informat BR-90046900 Porto Alegre RS Brazil Univ Fed Rio Grande do Sul Dept Elect Engn BR-90046900 Porto Alegre RS Brazil

ISBN: (纸本)9780769527659

this work presents a proposal to use aspect orientation in the analysis and design of distributed Embedded real-time Systems (DERTS). these systems have several requirements directly related to their main characteristics, the so-called Non-Functional Requirements (NFR), which refer to orthogonal properties, conditions, and restrictions that are spread out over the entire system. Pure object-oriented methods do not address successfully those so called crosscutting concerns, so new technologies, like aspect orientation, are applied in order to fulfill this gap. the paper presents DERAF - distributed Embedded real-time Aspects Framework, an extensible and high-level framework (i.e. implementation-independent) to handle NFR of DERTS at earlier design stages. DERAF combines the use of aspects with RT-UML, aiming to separate the handling of non-functional from functional requirements in the Model Driven Design of DERTS. the paper presents the use of DERAF on a case study of an unmanned air vehicle (UAV).

关键词： Requirements engineering

来源：评论

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QUICKER: A model-driven QoS mapping tool for QoS-enabled component middleware

QUICKER: A model-driven QoS mapping tool for QoS-enabled com...

引用

10th ieee international symposium on object and component-oriented real-time distributed computing

作者： Kavimandan, Amogh Balasubramanian, Krishnakumar Shankaran, Nishanth Gokhale, Aniruddha Schmidt, Douglas C. Vanderbilt Univ Dept EECS Nashville TN 37240 USA

ISBN: (纸本)9780769527659

this paper provides three contributions to the study of quality of service (QoS) configuration in component-based DRE systems. First, we describe the challenges associated with mapping the platform-independent QoS policies of an application into platform-dependent values of QoS parameters used to configure the behavior of QoS-enabled component middleware. Second, we describe a novel approach that uses model-transformation to map these QoS policies onto component middleware QoS configuration parameters. third, we demonstrate the use of model-checking to verify the properties of the transformation and automate the synthesis of configuration parameters required to tune the QoS-enabled component middleware. Our results indicate that model-transformation and model-checking provide significant benefits with respect to automation, reusability, verifiability, and scalability of the QoS mapping process compared with conventional middleware configuration techniques.

关键词： Middleware

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Towards a layered architecture for object-based execution in wide-area deeply embedded computing

Towards a layered architecture for object-based execution in...

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10th ieee international symposium on object and component-oriented real-time distributed computing

作者： Abdelzaher, Tarek Cao, Qing Ganti, Raghu Henriksson, Dan Khan, Maifi Heo, Jin Huang, Chengdu Jayachandran, Praveen Le, Hieu Khac Luo, Liqian Tsai, Yu-En Univ Illinois Dept Comp Sci Urbana IL 61801 USA

ISBN: (纸本)9780769527659

Sensor networks introduce a new application domain and set of challenges in distributed computing including new network-level programming languages, global system abstractions, and general-purpose communication protocols. these challenges are brought about by the tight integration of computation, communication, and distributed real-time interaction with the physical world. With the growing interest in interconnecting different sensor networks across a wide-area communication infrastructure, an overarching challenge becomes one of arriving at an agreed-upon global sensor network architecture that ensures interoperability. Unlike the Internet, where a layered communication stack (namely, the TCP/IP stack) defines the network architecture, a sensor network architecture must unify not only communication interfaces but also programming interfaces, sit-ice network communication and computation functions are tightly intertwined. In that sense, the sensor network architecture refers to a layered stack of distributed computing abstractions. this paper presents an architecture and key considerations in designing and interconnecting local and global sensor networks. Candidate protocols and middleware instantiations are described from the authors' ongoing work that meet the discussed considerations.

关键词： Embedded systems

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Design and performance evaluation of configurable component middleware for end-to-end adaptation of distributed real-time embedded systems

Design and performance evaluation of configurable component ...

引用

10th ieee international symposium on object and component-oriented real-time distributed computing

作者： Shankaran, Nishanth Schmidt, Douglas C. Koutsoukos, Xenofon D. Chen, Yingming Lu, Chenyang Vanderbilt Univ Dept EECS Nashville TN 37240 USA Washington Univ Dept Comp Sci & Engn St Louis MO 63130 USA

ISBN: (纸本)9780769527659

Standards-based quality of service (QoS)-enabled component middletvare is increasingly being used as a platform,for developing distributed real-time embedded (DRE) systems that execute in open environments where operational conditions, input workload, and resource availability cannot be characterized accurately a priori. Although QoS-enabled component middleware offers many desirable features, until recently it lacked the ability to efficiently allocate resources and configure platform-specific QoS settings based on utilization of system resources and application QoS. Moreover, it has also lacked the ability to monitor and enforce application QoS requirements. this paper presents two contributions to research on adaptive resource management for component-based DRE systems. First, we describe the structure and functionality of the Resource Allocation and Control Engine (RACE), which is an open-source adaptive resource management framework built atop standards-based QoS-enabled component iniddleware. Second, we demonstrate the effectiveness of RACE in the context of a representative DREsystem: NASA's Magnetospheric Multi-scale Mission system.

关键词： Middleware

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On best-effort real-time assurances for recovering from distributable thread failures in distributed real-time systems

On best-effort real-time assurances for recovering from dist...

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10th ieee international symposium on object and component-oriented real-time distributed computing

作者： Ravindran, Binoy Curley, Edward Anderson, Jonathan S. Jensen, E. Douglas Virginia Tech ECE Dept Blacksburg VA 24061 USA Mitre Corp Bedford MA 01730 USA

ISBN: (纸本)9780769527659

We consider the problem of recovering from failures of distributable threads in distributed real-time systems that operate tinder run-time uncertainties including those on thread execution times, thread arrivals, and node failure occurrences. When a thread encounters a node failure, it causes orphans. Under a termination model, the orphans must be detected and aborted, and exceptions must be delivered to farthest, contiguous surviving thread segment for resuming thread execution. Our application/scheduling model includes distributable threads and their exception handlers that are subject to time/utility function (TUF) time constraints and an utility accrual (UA) optimality criterion. A key underpinning of the TUF/UA scheduling paradigm is the notion of "best-effort" where high importance threads are always favored over low importance ones, irrespective of thread urgency. We present a scheduling algorithm called HUA and a thread integrity protocol called TPR. We show that HUA and TPR bound the orphan cleanup and recovery time with bounded loss of the best-effort property. Our implementation experience of HUA/TPR within Sun's distributed real-time Specification for Java demonstrates the algorithm/protocol's effectiveness.

关键词： real time systems

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real-time tasks scheduling with value control to predict timing faults during overload

Real-time tasks scheduling with <i>value</i> control to pred...

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10th ieee international symposium on object and component-oriented real-time distributed computing

作者： Tres, Crineu Becker, Leandro Buss Nett, Edgar Univ Fed Santa Catarina Automat & Syst Dept Florianopolis SC Brazil Otto Von Guericke Univ Inst Distributed Syst IVS Magdeburg Germany

ISBN: (纸本)9780769527659

Modern real-time applications are very dynamic and cannot cope with the use of worst case execution time to avoid overload situations. therefore scheduling algorithms that are able to prevent timing faults during overload are required. In this context, the value parameter has become useful to add generality and flexibility to such systems. In this paper we present the scheduling algorithm called DMB (Dynamic Misses Based), which is capable of dynamically changing tasks value in order to adjust their importance according to its timing faults rate. the main goal of DMB is to allow the prediction of timing faults during overloads and thereby support a dynamic tuning of tasks fault rate. It is used to enhance the features of the previously defined TAFT (time-Aware Fault-Tolerant) scheduler Obtained results show that DMB in conjunction with TAFT reached the most promising results during overloads, allowing to control tasks degradation in a graceful and determined way.

关键词： Scheduling

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A unified Benchmarking process for components in automotive embedded systems software

A unified Benchmarking process for components in automotive ...

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10th ieee international symposium on object and component-oriented real-time distributed computing

作者： Forster, Wolfgang Kutschera, Christof Schreiner, Dietmar Goeschka, Karl M. Vienna Univ Technol Inst Informat Syst Distributed Syst Grp Argentinierstr 8-184-1 A-1040 Vienna Austria Univ Appl Sci Technikum Vienna Dept Embedded Syst A-1200 Vienna Austria

ISBN: (纸本)9780769527659

During the last years, component based software development has become a well accepted software engineering paradigm within the automotive industry. this fact is not only reflected by upcoming development tools but also by newly arising automotive software standards. In component based software engineering, applications are built by assembling small reusable building blocks, the components. Typically more than one component implementation meets the application developer's requirements, so proper selection of the assembled components becomes a key element of the whole procurement and engineering process. this paper's contribution is twofold: First, a basic set of performance and dependability metrics and measures for automotive components is identified. Second, a unified benchmarking process is proposed, that allows an unambiguous comparison of distinct component implementations of a given component class.

关键词： Embedded systems

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