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7th ieee international symposium on object-oriented real-time distributed computing

作者： Tsetsos, V Sekkas, O Priggouris, L Hadjiefthymiades, S Univ Athens Dept Informat & Telecommun GR-15784 Athens Greece

ISBN: (纸本)076952124X

The scheduling paradigm offers an alternative execution model for services and applications, which is of particular interest for the enterprise domain. Therefore, task scheduling is considered as an integral part of many contemporary information systems and service platforms. In this paper we present, the architectural aspects of an integrated scheduling framework, targeted to the mobile applications market along with an implementation prototype, which was also developed with the purpose of demonstrating its capabilities and identifying its limitations.

关键词： Enterprise resource planning

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On safe service-oriented real-time coordination for autonomous vehicles

On safe service-oriented real-time coordination for autonomo...

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11th ieee symposium on object/component/service-oriented real-time distributed computing

作者： Becker, Basil Giese, Holger Univ Potsdam Hasso Plattner Inst Syst Anal & Modeling Grp D-14482 Potsdam Germany

ISBN: (纸本)9780769531328

The performance of autonomous vehicles could be drastically improved if ad-hoc networking and suitable real-time coordination is employed to optimize and improve the joint behavior of multiple autonomous units. However, due to ad-hoc connections and the real-time interaction the correctness and safety of such coordinated autonomous units is very hard to ensure. In this paper we present how service-oriented real-time coordination can be employed to achieve this goal. Based on the proper real-time coordination between two or more vehicles captured by a service contract, we focus on structural changes and the instantiation and termination of service contracts which is a crucial prerequisite for a safe system operation. We present how the structural changes and the service contract creation/deletion can be modeled by a well-defined UML subset consisting of class and object diagrams with collaborations as well as well-defined behavioral rules can be verified taking the dynamic structural changes due to the ad-hoc networking as well as the real-time coordination into account. The new verification technique is outlined and the application of the technique for an application example is presented.

关键词： Vehicles

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An architecture to support dynamic service composition in distributed real-time systems

An architecture to support dynamic service composition in di...

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

作者： Estevez-Ayres, Iria Almeida, Luis Garcia-Valls, Marisol Basanta-Val, Pablo Univ Carlos III Madrid Dpto Ing Telemat Madrid Spain Univ Aveiro IEETA LSE DET P-3800 Aveiro Portugal

ISBN: (纸本)9780769527659

Recently, new trends in application development for distributed platforms, such as the composable services model, attempt to provide more flexibility in system design, deployment and execution. Such trends, and particularly the referred composable services model, can also be beneficial in real-time distributed embedded systems, also providing a means to support more adaptive behaviors, reacting to the execution environment or coping with system. reconfiguration. This paper explores a relatively new direction, which is the extension of the service-based model to dynamic, i.e. at run-time, composition in real-time distributed environments, in order to support the level of flexibility and adaptibility referred above. The paper proposes an architecture to support such dynamic service composition that is based on the Flexible time Triggered communication paradigm (FTT). To achieve the desired goal, we also redefine the concepts of service and service-based application in the concept of the FTT paradigm. Finally, we show experimental results obtained with a prototype implementation of the proposed architecture that confirm its feasibility and good temporal behavior

关键词： Computer architecture

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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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Delivering Sustainable Capability on Evolutionary service-oriented Architecture

Delivering Sustainable Capability on Evolutionary Service-or...

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ieee international symposium on object/component/service-oriented real-time distributed computing

作者： Liu, Lu Russell, Duncan Webster, David Luo, Zongyang Venters, Colin Xu, Jie Davies, John K. Univ Leeds Sch Comp Leeds W Yorkshire England BAE Sys Insyte Frimley England

ISBN: (纸本)9780769535739

Network Enabled Capability (NEC) is the U.K. Ministry of Defence's response to the quickly changing conflict environment in which its forces must operate. In NEC, systems need to be integrated in context, to assist in human activity and provide dependable inter-operation. In order to provide reliable and sustainable military capability, fast paced changes must be conducted without halting the operation of a capability. In this paper we present the concept of evolutionary service-oriented architecture for delivering sustainable capability. The reliability of the architecture is evaluated by simulations using a computer-based model. The simulation results indicate that the evolutionary service-oriented architecture can provide higher reliability and sustainability in the provision of capability in a dynamic environment.

关键词： evolutionary architecture Network-Enabled Capability service-oriented Architecture

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Improving dependability of service oriented architectures for pervasive computing

Improving dependability of service oriented architectures fo...

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8th ieee international Workshop on object-oriented real-time Dependable Systems (WORDS 2003)

作者： Cotroneo, D Di Flora, C Russo, S Univ Naples Federico II Dipartimento Informat & Sistemist Naples Italy

ISBN: (纸本)0769519296

service oriented Programming - which combines distributed object computing, component Based and web-based concepts - has recently emerged as a promising approach to develop dynamic and heterogeneous service provision environments. Such systems are referenced in literature as service oriented Architectures. Classic strategies to address dependability in distributed object computing middleware may not be straightforwardly applied to service oriented Architectures (SOAs) for pervasive computing, since they operate in quite different contexts compared to traditional DOC middleware. In this paper focus is on dependability issues of SOAs. In particular we identify dependability requirements of such systems during their life cycle showing how these requirements may change depending on the time phase (discovery, lookup, setup, delivery). We also explore the suitability of Jini technology as an enabling infrastructure to improve availability and reliability, describing both the benefits and drawbacks of a Jini-based solution in the context of a case study application, namely PRINCEPS.

关键词： Middleware

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Fast, Efficient Performance Predictions for Big Data Applications 22

Fast, Efficient Performance Predictions for Big Data Applica...

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22nd ieee international symposium on real-time distributed computing (ISORC)

作者： Maroulis, Stathis Zacheilas, Nikos Theocharis, Thanasis Kalogeraki, Vana Athens Univ Econ & Business Dept Informat Athens Greece

ISBN: (纸本)9781728101514

In recent years we observe a rapid growth in the deployment of machine learning workloads on big data analytics frameworks like Apache Spark and Apache Flink. These workloads are typically represented as graphs, run on shared infrastructures and often have much more demanding resource requirements than those traditionally found in typical enterprise settings. However, predicting the execution times of the workloads is important as they often run on shared public or private infrastructures and, thus, their execution is greatly affected by the resource sharing, the hardware infrastructure utilized as well as the choice of the configuration parameters provided by the frameworks. In this work, we propose a fast and efficient performance prediction system to address the challenge of predicting the execution times of big data workloads, exploiting the fact that workloads are represented as processing graphs and often share similar structures and parameters. Thus, we can use the performance models we have built for already deployed workloads, to estimate the end-to-end execution time for a new workload. Previous works assume that a large number of profiling runs can be utilized for building the prediction models. However, this assumption is not always valid and more elaborate mechanisms need to be applied. Our detailed experimental evaluation on our local Spark cluster illustrates that our approach can predict accurately the execution time of a wide range of Spark workloads.

关键词： Graph Similarity Predictions distributed Systems

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real-time distribution of time-dependant tasks in heterogeneous environments

Real-time distribution of time-dependant tasks in heterogene...

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2010 13th ieee international symposium on object/component/service-oriented real-time distributed computing Workshops, ISORC Workshops 2010

作者： Pacher, Mathias Brinkschulte, Uwe Institut für Informatik Johann Wolfgang Goethe Universität Frankfurt Germany

ISBN: (纸本)9780769540382

In this paper we present a new approach to distribute tasks connected by causal dependencies within a heterogeneous environment, e.g. several resources communicating with each other or a processor grid. Our approach uses an artificial hormone system for task distribution which is able to meet real-time constraints. Several enhancements of the artificial hormone system are made such as partial suppressing of tasks and distributed task termination. © 2010 ieee.

关键词： Multi-stage distributed control loops realtime task distribution heterogeneous environment Religious Missions task termination Distribute Hormones real time Environments

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Applicability of web service technologies to reach real time capabilities

Applicability of web service technologies to reach real time...

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11th ieee symposium on object/component/service-oriented real-time distributed computing

作者： Prueter, Steffen Moritz, Guido Zeeb, Elmar Salomon, Ralf Timmermann, Dirk Golatowski, Frank Univ Rostock D-18051 Rostock Germany Ctr Life Sci & Automat D-18119 Rostock Germany

ISBN: (纸本)9780769531328

Currently the developing process for enterprise applications is improved by the service oriented Architecture (SOA) paradigms. With SOAs the creation of modular and clearly defined software architectures at a high grade of interoperability and reusability is possible. For resourceconstraint networked devices the Devices Profile for Web services (DPWS) specification adapt the SOA paradigms to create a framework for interoperable and standardized communication between embedded devices. This paper explains how special parts of DPWS can be adapted to provide real-time capabilities. So this paper shows how developers of real-time software can use the advantages of Web services and which adaptations are necessary to create Web services with real-time capabilities.

关键词： Web services

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Dependable and secure TMO scheme

Dependable and secure TMO scheme

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9th ieee international symposium on object and component-oriented real-time distributed computing

作者： Kim, Jungin Thuraisingham, Bhavani Univ Texas Dept Comp Sci Austin TX 78712 USA

ISBN: (纸本)076952561X

In a real-time distributed computing environment, security is critical to protect the system from unauthorized access especially since such systems are being used in time critical applications. Access Control mechanisms have been introduced during the last several decades and have offered a basic and powerful means for enforcing security. In this paper, we examine the concepts of the TMO (time Triggered Message Triggered object) scheme that provides guaranteed real-time services in a distributed object computing environment. We also examine access control mechanisms;such as the traditional model, the RBAC (Role-based Access Control) model and the UCON (Usage Control) model. The main contribution of this paper is applying the traditional, RBAC and UCON models to the TMO scheme in order to provide a secure real-time distributed environment.

关键词： distributed computer systems

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