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

作者： Datta, A. K. Gradinariu, M. Virgillito, A. Univ Nevada Sch Comp Sci Las Vegas NV 89154 USA Univ Roma La Sapienza Rome Italy

ISBN: (纸本)076952561X

the network connectivity is a basic requirement while implementing fundamental communication and storage abstractions in P2P networks, featuring scalability and fault-tolerance. the quality of services of abstractions like for example multicast, publish/subscribe, group membership or persistent storage is strongly related to the connectivity degree of the underlying overlay. Intuitively, a higher overlay connectivity ensures a reinforced reliability and consequently, the deployment of distributed applications with real-time constraints on top of these overlays becomes feasible even in environments characterized by a high dynamicity, i.e., nodes arriving and departing at a high rate. Our paper proposes a novel delta-connected DHT-free P2P overlay. Our overlay offers strong connectivity guarantees despite the system dynamicity. the construction and the maintenance of our overlay is completely decentralized and handled strictly locally, through deterministic algorithms whose correctness is rigorously proved.

关键词： distributed computer systems

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Modelling and implementing asynchronous timed multimedia frameworks using coordination principles

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FUTURE GENERATION COMPUTER SYSTEMS-thE international JOURNAL OF ESCIENCE 2005年第5期21卷 687-698页

作者： Papadopoulos, GA Univ Cyprus Dept Comp Sci CY-1678 Nicosia Cyprus

this paper combines work done in the areas of Artificial Intelligence, Multimedia Systems and Coordination Programming to derive a framework for distributed Multimedia Systems based on asynchronous timed computations expressed in a certain coordination formalism. More to the point, we propose the development of multimedia programming frameworks based on the declarative logic programming setting and in particular the framework of object-oriented timed concurrent constraint programming (OO-TCCP). the real-time extensions that have been proposed for the concurrent constraint programming framework are coupled with the object-oriented and inheritance mechanisms that have been developed for logic programs yielding an integrated declarative environment for multimedia objects modelling, composition and synchronisation. Furthermore, we show how the framework can be implemented in the general-purpose coordination language MANIFOLD without the need for using special architectures or real-time languages. (c) 2004 Elsevier B.V. All rights reserved.

关键词： multimedia programming timed concurrent constraint programming timed asynchronous languages coordination models distributed computing

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realization of Fault-Tolerant Home Network Management Middleware with the TMO Structuring Approach and an Integration of Fault Detection and Reconfiguration Mechanisms

Realization of Fault-Tolerant Home Network Management Middle...

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ieee international symposium on object/Component/Service-oriented real-time distributed computing

作者： Kim, K. H. (Kane) Zhou, Qian Qian, Jing Moon, Kyung-Deok Park, Jun Hee Son, Young-Sung Lee, Chang-Eun Ku, Tai-Yeon Univ Calif Irvine Dept EECS Irvine CA 92697 USA Elect & Telecom Res Inst Daejeon South Korea

ISBN: (纸本)9780769535739

A middleware model named ROAFTS (real-time object-oriented Adaptive Fault Tolerance Support) has been evolving in the UCI DREAM Lab. over the past decade as the core of a reliable execution engine model for fault-tolerant (FT) real-time (RT) distributed computing (DC) applications. It is meant to be an integration of various mechanisms for fault detection and recovery in a form that meshes well with high-level RT DC object/component-based programming, in particular, TMO (time-triggered Message-triggered object) programming. Using ROAFTS as a backbone and low-layer middleware, we developed a model and a skeleton implementation for FT DC middleware providing efficient FT execution services for component-based home network applications. Capabilities for management of home information processing devices, including health monitoring of home devices, reconfiguration of device connections, and servicing queries on device status, were added to ROAFTS. those additions were first designed as a network of high-level RT DC components, i.e., TMOs. then the TMO network was extended into an FT TMO network by applying the replication scheme called the PSTR (Primary-Shadow TMO Replication) scheme and incorporating a component responsible for reconfiguring TMO replicas. this extension of ROAFTS is called ROAFTS-HNE (Home Network Extension) and its architecture is presented here. In addition, during the development of the ROAFTS-HNE model, we formulated a new approach for applying the PSTR scheme to RT DC components supported by ROAFTS. Finally, evaluations of the recovery times of a prototype implementation have been conducted.

关键词： home network fault tolerance fault detection object replication ROAFTS PSTR template reconfiguration TMO real-time TNCM SNS RMP RSMPSM UMB

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Redesigning legacy systems into the object-oriented paradigm 6

Redesigning legacy systems into the object-oriented paradigm

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6th ieee international symposium on object-oriented real-time distributed computing

作者： Wong, WE Li, JJ Univ Texas Dept Comp Sci Richardson TX 75083 USA

ISBN: (纸本)0769519288

object-oriented languages support many modem programming paradigms such as information hiding, inheritance, polymorphism, and dynamic binding. As a result, software systems implemented in OO languages are more reusable and reliable than those in non-OO. Many legacy software systems were created before OO programming became popular and needed to be redesigned and updated to OO programs. the process of abstracting OO designs from the procedural source code was often done manually or with limited assistance from program structural diagrams. Most reengineering focuses on the functionality of the original program, and the OO redesign often results in a completely new design based on the designers' understanding of the original program. Such an approach is not sufficient, for it not only, takes time and effort for designers to become familiar with the original program, but the approach itself is also mistake-prone due to the human involvement. this paper presents a computer-aided semi-automatic method that abstracts OO designs from the original procedural source code. More specifically, it is a method for OO redesign based on program structural diagrams, visualization, and execution slice. We conducted a case study by applying this method to an inventory management software system. Results indicate that our method can effectively and efficiently abstract an appropriate OO design out of the original C code as well as re-generate part of the system in C++ code based on this new OO design.

关键词： OO redesign procedure/variable call graph structure distance structural pattern execution slice code partition feature visualization

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distributed simulation of multi-agent hybrid systems 5

Distributed simulation of multi-agent hybrid systems

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5th ieee international symposium on object-oriented real-time distributed computing (ISORC 2002)

作者： Hur, Y Lee, I Univ Penn Dept Comp & Informat Sci Philadelphia PA 19104 USA

ISBN: (纸本)0769515584

Systems such as coordinating robot systems, automobiles, aircrafts, and chemical process control systems can be modeled as interacting hybrid systems, where hybrid systems are finite state machines with continuous dynamics. the language CHARON and its simulator have been developed to model and analyze interacting hybrid systems as communicating agents. Simulations are widely used for the analyses of hybrid systems. the simulation of a complex system is, however usually very slow. this paper proposes four algorithms for distributed simulations of hybrid systems. the idea behind distributed simulations is to achieve a speedup by utilizing multiple computing resources. the agents of a modeled system. are distributed over multiple processors to simulate the agents more efficiently. Since the state of the agent is affected by the input from other agents, they synchronize to update their local states. the challenge here is how to reduce the agent synchronization overhead. We present two approaches for resolving the problem: conservative and optimistic approaches. For the optimistic approach, we present three different algorithms for distributed simulations of hybrid systems, and compare them.

关键词： Aerospace control Aircraft Analytical models Automata Automobiles Chemical processes Computational modeling Control system synthesis Process control Robot kinematics

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Adaptable situation-aware secure service-based (AS³) systems

Adaptable situation-aware secure service-based (AS<SUP>3</SU...

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8th ieee international symposium on object-oriented real-time distributed computing

作者： Yau, SS Davulcu, H Mukhopadhyay, S Huang, D Yao, Y Arizona State Univ Tempe AZ 85287 USA

ISBN: (纸本)0769523560

Service-oriented systems are distributed systems which have the major advantage of enabling rapid composition of distributed applications, regardless of the programming languages and platforms used in developing and running different components of the applications. In these systems, various capabilities are provided by different organizations as services interconnected by various types of networks. the services can be integrated following a specific workflow to achieve a mission goal for users. For large-scale service-based systems involving multiple organizations, high confidence and adaptability are of prime concern in order to ensure that users can use these systems anywhere, anytime with various devices, knowing that their confidentiality and privacy are well protected and the systems will adapt to satisfy their needs in various situations. Hence, these systems must be adaptable, situation-aware and secure. In this paper, an approach to rapid development of adaptable situation-aware secure service-based (AS) systems is presented. Our approach enables users to rapidly generate, discover, compose services into processes to achieve their goals based on the situation and adapt these processes when situation changes.

关键词： service-based systems adaptive workflow planning situation-awareness distributed trust management specification language verification

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OASIS: A service-oriented architecture for dynamic instrumentation of enterprise distributed real-time and embedded systems

OASIS: A service-oriented architecture for dynamic instrumen...

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13th ieee international symposium on object, Component, and Service-oriented real-time distributed computing, ISORC 2010

作者： Hill, James Sutherland, Hunt Stodinger, Paul Silveria, thomas Schmidt, Douglas C. Slaby, John Visnevski, Nikita Indiana University Indianapolis IN United States GE Global Research Niskayuna NY United States Raytheon Company Portsmouth RI United States Vanderbilt University Nashville TN United States

ISBN: (纸本)9780769540375

Performance analysis tools for enterprise distributed real-time and embedded (DRE) systems require instrumenting heterogeneous sources (such as application- and system-level hardware and software resources). Traditional techniques for software instrumentation of such systems, however, are tightly coupled to system design and metrics of interest. It is therefore hard for system testers to increase their knowledge base and analytical capabilities for enterprise DRE system performance using existing instrumentation techniques when metrics of interest are not known during initial system design. this paper provides two contributions to research on software instrumentation for enterprise DRE systems. First, it presents OASIS, which is service-oriented middleware for instrumenting enterprise DRE systems to collect and extract metrics without design time knowledge of which metrics are collected. Second, this paper empirically evaluates OASIS in the context of a representative enterprise DRE system from the domain of shipboard computing. Results from applying OASIS to a representative enterprise DRE system show that its flexibility enables DRE system testers to precisely control the overhead incurred via instrumentation. © 2010 ieee.

关键词： Service oriented architecture (SOA)

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Modularizing variability and scalability concerns in distributed real-time and embedded systems with modeling tools and component middleware

Modularizing variability and scalability concerns in distrib...

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

作者： Deng, Gan Schmidt, Douglas C. Gokhale, Aniruddha Nechypurenko, Andrey Vanderbilt Univ EECS Dept 2015 Terrace Pl Nashville TN 37203 USA Siemens AG Corp Technol D-80333 Munich Germany

ISBN: (纸本)076952561X

Developing real-time software for large-scale distributed real-time and embedded (DRE) systems is hard due to variabilities that arise from (1) integration with various subsystems based on different programming languages and hardware, OS, middleware platforms, (2) fine tuning the system to satisfy a range of customer requirements, such as various quality-of-service (QoS) properties, and (3) changing functional and QoS properties of the system based on available system resources. this paper describes our experience applying model-driven development (MDD) tools and QoS-enabled component middleware technologies to address domain- and middleware-specific variability, challenges in an inventory tracking system, which manages the storage and flow of items in warehouses. Our results show that (1) coherent integration of MDD tools and component middleware can provide a productive software process for developing DRE systems by modularizing and composing variability concerns and (2) significant challenges remain that must be overcome to apply these technologies to a broader range of DRE systems.

关键词： model-driven development domain-specific modeling languages component middleware

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real-time resource reservation for synchronized multimedia object over wireless LAN 5

Real-time resource reservation for synchronized multimedia o...

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5th ieee international symposium on object-oriented real-time distributed computing (ISORC 2002)

作者： Fahmi, H Latif, M Shafiq, B Paul, R Ghafoor, A Purdue Univ Sch Elect & Comp Engn W Lafayette IN 47907 USA

ISBN: (纸本)0769515584

the increasing use of wireless networks has necessitated the development of a wireless networking infrastructure that supports quality of service (QoS) for multimedia communications. Proxy servers are gaining prominence in facilitating QoS assurance and intelligent resource allocation for multimedia services. In this paper, we propose a proxy-based framework that provides QoS support to mobile users. We describe the overall QoS architecture and implement a number of key QoS functions, including bandwidth allocation and synchronization. In this architecture, admission control is exercised to ensure the long-term availability of resources to mobile clients, where the resources include bandwidth for supporting required presentation rates and buffer for synchronizing media streams. Bandwidth allocation is implemented in Linux Traffic Control using Stochastic Fairness Queueing and Token Bucket Filter disciplines to provide bandwidth guarantees for the multimedia connections. An adaptive synchronization technique is also implemented in the proxy to synchronize multiple streams originating from different sources before transmitting them to the clients for presentation. Finally, a number of quality adaptation strategies that accommodate the diverse requirements and capabilities of clients are described.

关键词： Admission control Bandwidth Channel allocation Mobile communication Network servers Quality of service Resource management Streaming media Wireless LAN Wireless networks

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Non-functional information transmission patterns for distributed real-time Java

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SOFTWARE-PRACTICE & EXPERIENCE 2011年第12期41卷 1409-1435页

作者： Basanta-Val, P. Garcia-Valls, M. Estevez-Ayres, I. Univ Carlos III Madrid DREQUIEM Lab Madrid Spain

Many real-time systems use preemptive priority-based scheduling in their internals to guarantee certain real-time performance. this includes technologies that range from the real-time Specification for Java (RTSJ) to middleware like real-time Common object Request Broker Architecture (RT-CORBA), which offers additional models and policies that blend client and server information. this decision eases the integration of real-time admission tests and dispatching policies in these types of infrastructures. In this paper, we analyze different trade-offs that emerge from the definition of different propagation models for distributed real-time Java. the paper covers technological integration aspects as impact on interfaces and other practical issues mainly related to the performance that this model offers to a real-time application and non-functional overhead. the contribution described in the paper may help in the development of the distributed Specification for Java (DRTSJ). Copyright (C) 2011 John Wiley & Sons, Ltd.

关键词： RTSJ DRSTJ RT-JRMP RT-RMI

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