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IEEE workshop on Future Trends of distributed Computing systems

作者： C.P. Leguizamo K. Mori Department of Computer Science Tokyo Institute of Technology Meguro Tokyo Japan

Recently with the advent of the IT and the wide spread use of the Internet, new user oriented production and logistic systems, such as the Supply Chain Management System, have been required in order to cope with the drastic and continuous changes on the markets and users' preferences. Therefore, heterogeneous database systems need to be integrated in a common environment which can cope effectively with the heterogeneous requirements of each company under an ever-evolving changing environment. That is assurance. Autonomous Decentralized Database System has been proposed in the background of e-business to achieve assurance in dynamic business critical applications. A loose consistency management technology confers autonomy to each site for updating while maintaining the consistency of the whole system. Moreover, a background coordination technology, by utilizing a mobile agent, has been devised to permit the sites can coordinate and cooperate each other while conferring the online property. The failure of transactions in the coordination process, however, may lead to loss of data and unavailability of the system. Therefore, an assurance information allocation technology by an autonomous mobile agent, in this background, is proposed based on the real-time and system's availability considerations. The effectiveness of the proposed technology is evaluated by simulation.

关键词： Database systems Mobile agents Internet Continuous production Production systems Logistics Supply chain management Companies Technology management real time systems

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共享总线多微处理器系统中分布式仲裁方案的研究及实现

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浙江大学学报（工学版） 2003年第2期37卷 178-184页

作者：刘峰葛霁光浙江大学生物医学信息研究所浙江杭州310027

共享总线多微处理器系统具有相当高的性能价格比,但随着处理器速度的不断提高,总线通信带宽和可靠性成为限制并行处理能力的主要瓶颈.总线仲裁对提高系统性能具有关键的作用.分布式一致优先权机制是一种新型的仲裁机制模型.在此基础上... 详细信息

共享总线多微处理器系统具有相当高的性能价格比,但随着处理器速度的不断提高,总线通信带宽和可靠性成为限制并行处理能力的主要瓶颈.总线仲裁对提高系统性能具有关键的作用.分布式一致优先权机制是一种新型的仲裁机制模型.在此基础上提出了基于时间变化的优先权仲裁事务缓冲的分布式仲裁方案.仲裁缓冲机制能够充分利用系统总线的并发特性来提高总线的利用率,此机制有利于并行处理系统中的实时和总线重负载应用环境.虚拟令牌环和时变优先权策略为处理器节点公平地共享总线资源提供了保障.多字节优先权标识使优先权更易于扩展.仿真工作验证了所提方案的正确性.

关键词：并行处理仲裁缓冲虚拟令牌环实时仲裁优先权队列

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Size-distortion optimized proxy caching for robust transmission of MPEG-4 video

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1st International workshop on Multimedia Interactive Protocols and systems

作者： Bouazizi, I Univ Aachen Dept Commun & Distributed Syst D-52074 Aachen Germany

ISBN: (纸本)3540205349

Video delivery over unreliable networks and across error-prone environements suffers a lot from packet loss. several error control techniques have been proposed to deal with this problem. However, retransmission, which achieves highest reliability, was judged as being not feasible for real-time applications. In this work, we propose the deployment of video proxy-caches for error control purposes. Video packets are classified by the sender according to their importance for the decoding process and the perceived video quality. This information is then carried within each packet. Proxy-caches, which are typically located within the network and at access points to lossy networks (e.g. mobile networks), identify valuable video packets and cache them for short periods of time. The receivers can direct their retransmission requests to the proxy caches located in their neighborhood. Furthermore, we develop new cache replacement techniques, based on distortion optimization theory, for operation under strong storage constraints. We show, through simulations and experimental results, important quality improvements compared to conventional sender-based retransmission mechanisms and other cache replacement techniques.

关键词： Proxy caches

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An approach for modeling and designing software architecture

An approach for modeling and designing software architecture

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International Conference and workshop on Engineering of Computer-Based systems

作者： Jiang Guo Department of Computer Science California State University Los Angeles CA USA

ISBN: (纸本)0769519172

A critical issue for complex component-based systems design is the modeling and analysis of architecture. Architectural specifications of software systems show them as a collection of interrelated components, and constitute what has been called the software architecture level of software design. It is at this level where the description and verification of structural properties of the system are naturally addressed. Besides, the use of explicit descriptions of the architecture of software systems enhances system comprehension and promotes software reuse. We have developed a tool-the Web-Based Software Architecture Prototyping System (SAPS)-in a distributed environment to meet the requirements of integrating software components into heterogeneous networks. Our system architecture design environment includes a Web-based Software Architecture Editor, the Java Code Generator (JCG), a Reusable Assets Repository (RAR), and a Platform Distribution Controller (PDC). By using the wrapper/glue technique, different simulation tools in a heterogeneous environment share the input/output data files for prototypes. The architecture is generalized for the communication among software components necessary for data interchange. Our system not only provides a useful array of tools for distributed real-time system prototyping, but also is a demonstration of the effective use of a distributed system in a heterogeneous environment.

关键词： software architecture formal specification software reusability software prototyping Internet Java virtual machines object-oriented programming real-time systems open systems program compilers complex component-based systems design software architecture modeling software architecture design software architecture analysis architectural specifications interrelated components software reuse Web-Based Software Architecture Prototyping System distributed environment heterogeneous networks Web-based Software Architecture Editor Java Code Generator Reusable Assets Repository Platform Distribution Controller wrapper/glue technique simulation tools heterogeneous environment input/output data file sharing data interchange real-time system prototyping

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A Prioritized h-out of-k Mutual Exclusion Algorithm with Maximum Degree of Concurrency for Mobile Ad Hoc Networks and distributed systems

A Prioritized h-out of-k Mutual Exclusion Algorithm with Max...

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The Fourth International Conference on parallel and distributed Computing, Applications and Technologies

作者： Jehn-Ruey Jiang Department of Information Management Hsuan Chuang University

＜正＞In this paper,we propose a distributed prioritized h-out of-k mutual exclusion algorithm for a mobile ad hoc network（MANET） with real-time or prioritized applications. The h-out of-k mutual exclusion problem is a generalization of the k-mutual exclusion problem and the mutual exclusion *** proposed algorithm is sensitive to link forming and link breaking and thus is suitable for a *** we do not consider the link breaking and forming,the proposed algorithm can also be applied to distributed systems consisting of stationary nodes that communicate with each other by exchanging messages over wired *** non-real-time applications,we may associate the priority with the number of requested resources to achieve the maximum degree of concurrency.

关键词： mobile ad hoc networks distributed systems mutual exclusion concurrency real-time systems

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A system-on-a-programmable-chip for real-time control of massively parallel arrays of biosensors and actuators

A system-on-a-programmable-chip for real-time control of mas...

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IEEE International workshop on System-on-Chip for real-time Applications

作者： A. Romani F. Campi S. Ronconi M. Tartagni G. Medoro N. Manaresi ARCES University of Bologna Italy Silicon BioSystems s.r.l. Italy

ISBN: (纸本)076951944X

The development of microelectronic lab-on-a-chip devices (LOACs) can now be pursued thanks to advances in silicon technology. As these kinds of devices may integrate different functional units, much care has to be put in the design of control units which have to provide real-time control capabilities in order to deal with complex systems composed of sensors, actuators, signal conditioning and processing circuits. Moreover, reconfigurability and expandability are key design features to get a flexible and reusable architecture. The FPGA implementation of a control system for an existing LOAC is presented as a case study with emphasis on the advantages of a programmable device approach. The presented system has been implemented on an Altera EPF10K200S device and the achieved operating frequency is 20MHz. The device was successfully tested and experimental results are hereby shown.

关键词： real time systems Control systems Biosensors Actuators Microelectronics Lab-on-a-chip Silicon Signal design Sensor systems Signal processing

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Security and middleware

Security and middleware

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workshop on Object-Oriented real-time Dependable systems (WORDS)

作者： A. Andersen G. Blair P.H. Myrvang T. Stabell-Kulo Department of Computer Science University of Tromsø Norway Distributed Multimedia Research Group Lancaster University UK

The security features of current middleware platforms, like Enterprise Java Beans and CORBA (Common Object Request Broker Architecture), are either simple and limited or complex and difficult to use. In both cases are the provided features static and do not support the flexibility needed in a wide range of applications. This paper introduces and approach to flexible security mechanisms in the context of a reflective middleware architecture. The reflective middleware OOPP (Open-ORB Python Prototype) is a component and capsule (container) based platform providing its reflective features through a set of distinct meta-models. Flexible security mechanisms are provided using a specialized programming language called Obol. In OOPP the flexible security mechanisms based on Obol is a subset of reflective features of the middleware platform. Obol and its machinery is a subset of one distinct aspect or meta-model of the middleware platform.

关键词： Middleware Programming profession Operating systems Java Containers Object oriented modeling real time systems Computer science Computer security Computer languages

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An agent architecture for network support of distributed simulation

An agent architecture for network support of distributed sim...

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International workshop/Symposium on distributed Simulation and real-time Applications (DS-RT)

作者： R. Simon Woan Sun Chang J.M. Pullen Department of Computer Science George Mason University Fairfax VA USA Department of Computer Science and C3I Center George Mason University Fairfax VA USA

Continued research into distributed agent-based systems and evolving Web based technologies are opening up tremendous possibilities for the deployment of large scale and highly extensible and flexible simulation systems. However, the question remains as to how well agent and Web based simulation systems can use underlying network services. This is especially true for complex distributed simulations that have multiple participants and real-time data delivery requirements. This paper addresses the issue of interconnection patterns among Web-based simulation agents. We first describe a simple agent-oriented architectural extension to an existing distributed simulation system. Next, we present a set of interconnection algorithms between the agents in the system, under the assumption that only end-host multicast is available. We experimentally evaluate our approach under a number of different scenarios. Our results show that by using a proper connection strategy it is possible to get performance comparable to network-layer multicast for agent-based systems that use end-host multicast.

关键词： Multicast protocols Computer science Voltage control Web services Computational modeling Computer simulation Multicast algorithms Algorithm design and analysis Internet Ontologies

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real-time texture-based classification of satellite imagery: An integration of pipelined system and distributed system

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International Journal of Robotics and Automation 2003年第3期18卷 138-148页

作者： You, Jane Zhang, David Department of Computing Hong Kong Polytechnic University Kowloon Hong Kong

Remote sensing requires fast and accurate analysis of remotely sensed images. However, the high demand for computation power has limited its important applications in real-time environments. This article describes a system integration approach to achieve real-time classification of satellite images by parallelism. In contrast to the traditional systems, which deal with data acquisition, compression, transmission, and analysis separately, our smart remote sensing system integrates a pipelined architecture onboard a satellite and a network of workstation clusters at the ground station. The pipelined system is responsible for the enhancement and compression of the image data captured from the camera onboard a satellite. A network of workstation clusters at the ground station is dedicated to the comprehensive analysis of such preprocessed remote data transmitted from the satellite in a parallel virtual machine environment, which includes decoding of the compressed image data and image classification by textures. Both the system design and implementation strategies are briefly described. In addition, a parallel search algorithm is introduced to speed up the classification tasks based on the accelerated cascading technique and the dynamic processor allocation scheme. The time complexity analysis and experimental results show the effectiveness and efficiency of the proposed techniques.

关键词： Remote sensing

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Simultaneous dynamic voltage scaling of processors and communication links in real-time distributed embedded systems 03

Simultaneous dynamic voltage scaling of processors and commu...

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IEL Citation

作者： Jiong Luo Li-Shiuan Peh Niraj Jha Princeton University

ISBN: (纸本)0769518702

Dynamic voltage scaling has been widely acknowledged as a powerful technique for trading off power consumption and delay for processors. Recently, variable-frequency (and variable-voltage) parallel and serial links have also been proposed, which can save link power consumption by exploiting variations in bandwidth requirement. In this paper, we address joint dynamic voltage scaling for variable-voltage processors and communication links in such systems. We propose a scheduling algorithm for real-time applications, with both data flow and control flow information captured. It performs efficient routing of communication events through multi-hops, as well as efficient slack allocation among heterogeneous processors and communication links to maximize energy savings, while meeting all real-time constraints.

关键词： processor scheduling microprocessor chips embedded systems distributed processing delays multiprocessor interconnection networks simultaneous dynamic voltage scaling real-time distributed embedded systems power consumption delay link power consumption variable-voltage processors variable-voltage communication links scheduling algorithm real-time applications data flow information control flow information communication events routing multi-hops slack allocation heterogeneous processors heterogeneous communication links real-time constraints

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