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international symposium on object-oriented real-time distributed computing

Presents the introductory welcome message from the conference proceedings. May include the conference officers9; congratulations to all involved with the conference event and publication of the proceedings record.

Presents the introductory welcome message from the conference proceedings. May include the conference officers' congratulations to all involved with the conference event and publication of the proceedings record.

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Wrong Assumptions and Neglected Areas in real-time Systems

Wrong Assumptions and Neglected Areas in Real-Time Systems

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international symposium on object-oriented real-time distributed computing

作者： E. Douglas Jensen MITRE Corporation USA

the real-time computing community uses the terms "predictability" and "determinism" - usually referring to timeliness - without defining them, or incorrectly as synonyms. that results in confusion,... 详细信息

ISBN: (纸本)9780769531328

关键词： real time systems Predictive models object oriented modeling distributed computing Uncertainty Probability distribution Particle measurements Accuracy Exponential distribution Environmental management

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An approach for self-reconfiguring and fault-tolerant distributed real-time systems

An approach for self-reconfiguring and fault-tolerant distri...

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作者： Klobedanz, Kay Mueller, Wolfgang Rettberg, Achim University of Paderborn/C-LAB Faculty of Electrical Engineering Computer Science and Mathematics 33102 Paderborn Germany Carl Von Ossietzky University Oldenburg Faculty II Department Computer Science 26129 Oldenburg Germany

ISBN: (纸本)9780769546698

In this paper we present an approach for the self reconfiguration of distributed micro-controllers for increased fault tolerance. Based on a modified distributed system topology utilizing a time division multiple access (TDMA) protocol, i.e., Flex Ray, we present a self-organized distributed coordinator concept which performs the self-reconfiguration in the case of node failures. We introduce a distributed coordinator, which utilizes redundant slots in the Flex Ray communication schedule and combines messages in configured protocol frames and slots to avoid a complete bus restart. As such, the self-reconfiguration is realized by means of predetermined information about resulting changes in the communication dependencies and (re-)assignments determined in the design phase. To retrieve the necessary information, we present an analytical approach, which determines a combined solution for the initial configuration and all possible reconfigurations for the remaining nodes of the Flex Ray network in case of node failures. Hence, through this method we can design self-reconfiguring network-based systems enabling the handling of node failures for an increased fault tolerance. © 2012 ieee.

关键词： Fault tolerance

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real-time fault-tolerance in federated cloud environments

Real-time fault-tolerance in federated cloud environments

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作者： Garraghan, Peter Townend, Paul Xu, Jie School of Computing University of Leeds LS2 9JT United Kingdom

ISBN: (纸本)9780769546698

Dependability is a critical concern in provisioning services in Cloud computing environments. this is true when considering reliability, an attribute of dependability that is a critical and challenging problem in a Cloud context [2]. Fault-tolerance is one means to attain reliability, and is typically implemented by using some form of diversity. Federated Cloud, which is an emerging Cloud paradigm that orchestrates multiple Clouds, is able to implement environmental diversity for Cloud applications with relative ease and minimal additional cost to the consumer due to its inherent design. real-time Applications (RTAs) can benefit from deploying fault-tolerant schemes to fulfill deadlines in the presence of faults as they enable the provisioning of correct service in the event of a component in the application failing. However, this diversity can potentially become an issue when designing dynamically scalable fault-tolerant RTAs in a federated Cloud environment while also fulfilling QoS demands. In particular, building fault-tolerant RTAs by using the diversity of the Virtual Machine (VM) configurations and of the underlying Cloud infrastructure can have a negative impact on the ability to fulfill deadlines whilst still allowing the application to dynamically provision VMs with minimal human interaction. this paper identifies a number of characteristics that affect the ability for a RTA to fulfill specified deadlines in a federated Cloud environment as a result of deploying environment diverse fault-tolerant schemes. Furthermore we have designed and performed initial experiments using a real world Cloud federation to justify the feasibility of this problem. Results demonstrate that deploying RTAs in a federated Cloud environment can potentially increase the rate of deadline violations. © 2012 ieee.

关键词： Fault tolerance

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Message from the symposium Co-chairs

Proceedings - Ninth IEEE International Symposium on Object-O...

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Proceedings - Ninth ieee international symposium on object-oriented real-time distributed computing, ISORC 2006 2006年 xii页

作者： Moon, Hae Kim Puschner, Peter Insup, Lee Konkuk University Korea Republic of Vienna University of Technology Austria University of Pennsylvania United States

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ISBN: (纸本)076952561X

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Experimental Analysis of real-time Multitasking on Multicore Systems

Experimental Analysis of Real-Time Multitasking on Multicore...

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international symposium on object-oriented real-time distributed computing

作者： Emad Albassam Hassan Gomaa Robert G. Pettit Department of Computer Science George Mason University Fairfax VA USA

this paper describes a preliminary investigation into the effect of multicore technology on the performance of real-time systems. In particular, it investigates the impact of varying the number of cores on multitasking performance and on different task configurations. Experimental results are presented for a real-time game application executing with several different hardware and software configurations.

关键词： real-time systems distributed computing

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Multiprocessors and the real-time Specification for Java

Multiprocessors and the Real-Time Specification for Java

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international symposium on object-oriented real-time distributed computing

作者： Andy Wellings Department of Computer Science University of York UK

Currently, the real-time Specification for Java (RTSJ) is silent on multiprocessor issues It attempts not to preclude multiprocessor implementations but provides no direct support. this paper discusses the issues that need to be addressed if the RTSJ is to be better defined for execution on a multiprocessor system. It proposes new dispatching and allocation models. Issues of cost enforcement, interrupts affinity and processor failure are covered.

关键词： Java Processor scheduling Protection Multiprocessing systems Costs Partitioning algorithms Scheduling algorithm Yarn Queueing analysis distributed computing

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Security Analysis of the Utilization of Corba object References as Authorization Tokens

Security Analysis of the Utilization of Corba Object Referen...

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international symposium on object-oriented real-time distributed computing

作者： Christoph Becker Sebastian Staamann Ralf Salomon Prism Technology University of Rostock Germany

In object-oriented real-time computing scenarios, particularly where Corba is used in embedded systems with resource constraints, developers and system architects often utilize Corba object references as authorization tokens. this paper investigates the security of this method in principle, and it presents the results of the analysis of the work and computing effort necessary for a potential attacker to fabricate Corba object references to existing objects for the purpose of illegitimately gaining access to these objects at the instance of seven widely used Corba products

关键词： Authorization real time systems Software systems Embedded computing Embedded system Communication system security Logic design Computational intelligence Probes Computers

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Model Checking Multi-Task Software on real-time Operating Systems

Model Checking Multi-Task Software on Real-Time Operating Sy...

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international symposium on object-oriented real-time distributed computing

作者： Toshiaki Aoki Japan Advanced Institute of Science and Technology Noumi Ishikawa Japan

ISBN: (纸本)9780769531328

In this paper, we propose a method to verify software executed on RTOS which conforms to mulTRON with a model checking tool Spin. the RTOS provides facilities such as priorities and service calls to control the execution of tasks, however, Spin does not provide them. thus, we implemented a middleware which allows us to use the facilities and simulate the execution of the tasks in Spin. the paper shows how it is implemented and its evaluation.

关键词： real time systems Operating systems object oriented modeling Processor scheduling Software tools Middleware Embedded software Concrete Libraries distributed computing

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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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ieee international symposium on object/component/Service-oriented real-time distributed computing Workshops (ISORCW)

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

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.

关键词： Biochemistry Automated highways Load management Processor scheduling real time systems Middleware Scheduling algorithm distributed computing Conferences distributed control

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