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3rd international Workshop on Object-Oriented Real-Time Dependable Systems

作者： Tanaka, K Higaki, H Takizawa, M Tokyo Denki Univ Saitama Japan

ISBN: (纸本)0818680474

In distributed applications, multiple objects are cooperated to achieve some objectives. The objects may suffer from kinds of faults. If some object o is fatty, o is rolled back to the checkpoint and objects which have received messages from o are also required to be rolled back. In this paper, we define influential messages whose receivers are required to be rolled back if the senders are rolled back in the object-based computation model. By using the influential messages, an object-based (O) checkpoints are defined to denote semantically consistent global states of the system while inconsistent with the traditional message-based definition. We show how many checkpoints can be reduced by taking only the O-checkpoints.

关键词： distributed computer systems

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Deadline handling in real-time distributed objects 3

Deadline handling in real-time distributed objects

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3rd IEEE international symposium on Object-Oriented Real-Time distributed Computing, ISORC 2000

作者： Kim, K.H. Liu, Juqiang Kim, Moon-Hae University of California IrvineCA92697 United States

ISBN: (纸本)0769506070

Deadline handling is a fundamental part of real-time computing but has been practiced in ad hoc forms for decades. A general framework for systematic deadline handling in real-time distributed computer systems is proposed in this paper. The notions of hard deadlines and hard-real-time program components are discussed along with the advantages of a hard-real-time component based construction approach. To present approaches for implementation of systematic deadline handling in concrete forms, we use the time-triggered message triggered object (TMO) network structuring as the basic design framework in which deadline handling approaches are incorporated. The TMO structuring scheme is a general-style component structuring scheme and supports design of all types of components including hard-real-time objects and non-real-time objects within one general structure. An augmentation of the TMO structure with statistical performance indicators is also proposed. © 2000 IEEE.

关键词： Forms (concrete)

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Clustering in stochastic asynchronous algorithms for distributed simulations

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3rd international symposium on Stochastic Algorithms, Foundations and applications (SAGA 2005)

作者： Manita, A Simonot, F Moscow MV Lomonosov State Univ Fac Math & Mech Moscow 119992 Russia

We consider a cascade model of N different processors performing a distributed parallel simulation. The main goal of the study is to show that the long-time dynamics of the system have a cluster behaviour. To attack t... 详细信息

ISBN: (纸本)3540294988

关键词： Algorithms

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Statistics of populations of images and its embedded objects: Driving applications in neuroimaging

Statistics of populations of images and its embedded objects...

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3rd IEEE international symposium on Biomedical Imaging

作者： Gerig, G. Joshi, S. Fletcher, T. Gorczowski, K. Xu, S. Pizer, S. M. Styner, M. Univ N Carolina Dept Comp Sci Chapel Hill NC 27599 USA Univ N Carolina Dept Psychiat Chapel Hill NC 27599 USA Univ N Carolina Dept Radiat Oncol Chapel Hill NC 27599 USA

ISBN: (纸本)9780780395763

Work in progress towards modeling shape statistics of multi-object complexes is presented. Constraints defined by the set of objects such as a compact representation of object shape relationships and correlation of shape changes might have advantages for automatic segmentation and group discrimination. We present a concept for statistical multi-object modeling and discuss the major challenges which are a reduction to a small set of descriptive features, calculation of mean and variability via curved statistics, the choice of aligning sets of multiple objects, and the problem of describing the statistics of object pose and object shape and their interrelationship. Shape modeling and analysis is demonstrated with an application to a longitudinal autism study, with shape modeling of sets of 10 subcortical structures in a population of 20 subjects.

关键词： Medical imaging

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Monitoring distributed real-time activities in DCOM 3

Monitoring distributed real-time activities in DCOM

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3rd IEEE international symposium on Object-Oriented Real-Time distributed Computing, ISORC 2000

作者： Mock, M. Gergeleit, M. Nett, E. Inst. for Autonomous Intelligent Syst. German Nat. Res. Center for Inf. Technol. St. Augustin Germany Germany

ISBN: (纸本)0769506070

Object-oriented frameworks have become a key element in the design of distribution systems. They make the existence of the physical and operating system level resources transparent to the designer and provide the abstract view of the distributed systems as a set of objects that interact by invoking well-defined interfaces of each other. Easy reuse of existing components, location transparency and implementation hiding are the main ingredients of such frameworks that simplify the task of designing distributed systems drastically. It is desirable to take advantage of these benefits when designing distributed real-time systems, too. However, this goal conflicts with the essential need to consider the allocation of system resources when real-time requirements must be met. Here, system level resource issues such as execution times on CPUs, thread switches, occurrence of interrupts, and message delays are of primary interest. Our approach to solve this dilemma is to allow and support the designer of distributed real-time object-oriented applications to become aware of system level resources. We present a monitoring tool JewelDC that allows monitoring of distribution activities (i.e. nested sequences of object invocations) in a distributed object-oriented framework. distributed activities are visualized at the abstract object level while simultaneously revealing their use of system level resources. The tool has been implemented for DCOM on Microsoft Windows NT 4.0. © 2000 IEEE.

关键词： Program processors

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An open QoS architecture for CORBA applications 3

An open QoS architecture for CORBA applications

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3rd IEEE international symposium on Object-Oriented Real-Time distributed Computing, ISORC 2000

作者： Siqueira, F. Cahill, V. Distributed Systems Group Department of Computer Science Trinity College Dublin Ireland

ISBN: (纸本)0769506070

distributed application programmers rely on middleware such as CORBA in order to handle the complexity that arises from the distributed and heterogeneous nature of the underlying computing platform. CORBA, in particular, provides a media streaming mechanism that can be used both for media streaming and for associating QoS requirements with media streams. Despite defining the interfaces of the media streaming mechanism, the corresponding specification does not prescribe how QoS is enforced at low levels by the middleware. This paper describes the design and implementation of a QoS architecture, called Quartz, which has been integrated with CORBA in order to provide a framework that allows applications to transfer real-time media in open systems. This framework is employed to model and simulate a pattern recognition mechanism for use in an automated manufacturing cell, which is also described and analysed in this paper. © 2000 IEEE.

关键词： Media streaming

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REAL-TIME CONTROL OF PHYSICALLY distributed SYSTEMS - APPLICATION - MOTION CONTROL

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COMPUTERS & ELECTRICAL ENGINEERING 1992年第1期18卷 51-72页

作者： TORNGREN, M WIKANDER, J ROYAL INST TECHNOL DEPT MACHINE ELEMENTSDAMEK RES GRPS-10044 STOCKHOLM 70SWEDEN

A distributed control system. controlling the motion of a mechanical system, consists of several intelligent modules, one for each degree of freedom. Each module contains one actuator, one or more sensors and a microelectronics subsystem. The modules together execute the control engineering solution of the actual control theory problem. Typical motion control applications which could benefit from distributed control include industrial robots, vehicles, and tunnel drilling machines. By way of introduction the characteristics of motion control applications are described. Reasons for and trends towards distributing intelligence to actuators and sensors are presented. Due to harsh environments the microelectronic subsystems must be compact and robust. Technical trends facilitating integration of mechanics and microelectronics are described. The following issues are identified as critical when designing distributed control systems: Specification and verification methods or real-time systems;the view of time;consistency constraints;communication system architectures;predictable behaviour and debugging. A state of the art survey is given. Finally the question of how to map the control engineering solution of the actual control theory problem to the intelligent actuators is treated, i.e. choice of suitable allocation strategies, scheduling algorithms and communication system architectures. Fundamental static allocation strategies include master slave application systems (ranging from distributed low level I/O handling to distributed servo functions) and fully distributed application systems (ranging from distributed servo and superior control functions to a fully replicated global servo function).

关键词： Control Systems, distributed Parameter

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Implementation of distributed key generation algorithms using secure sockets

Implementation of distributed key generation algorithms usin...

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3rd IEEE international symposium on Network Computing and applications

作者： Chronopoulos, AT Balbi, F Veljkovic, D Kolani, N Univ Texas Dept Comp Sci San Antonio TX 78249 USA

ISBN: (纸本)0769522424

distributed Key Generation (DKG) protocols are indispensable in the design of any cryptosystem used in communication networks. DKG is needed to generate public/private keys for signatures or more generally for encrypting/decrypting messages. One such DKG (due to Pedersen) has recently been generalized to a provably secure protocol by Gennaro et al. We propose and implement an efficient algorithm to compute the (group generator) parameter g required in the DKG protocol. We also implement the DKG due to Gennaro et al. on a network of computers using secure sockets. We run tests which show the efficiency of our implementation.

关键词： distributed computer systems

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CORBA request portable interceptors: analysis and applications

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CONCURRENCY AND COMPUTATION-PRACTICE & EXPERIENCE 2003年第6期15卷 551-579页

作者： Baldoni, R Marchetti, C Verde, L Univ Roma La Sapienza Dipartimento Informat & Sistemist I-00198 Rome Italy

Interceptors are an emerging middleware technology enabling the addition of specific network-oriented capabilities to distributed applications. By exploiting interceptors, developers can register code within interception points, extending the basic middleware mechanisms with specific functionality, e.g. authentication, flow control, caching, etc. Notably, these extensions can be achieved without modifying either the application or the middleware code. In this paper we report the results of our experiences with CORBA request portable interceptors. In particular, we point out (i) the basic mechanisms implementable by these interceptors, i.e. request redirection and piggybacking and (ii) we analyze their limitations. We then propose a proxy-based technique to overcome the interceptors' limitations. Successively, we present a performance analysis carried out on three Java-CORBA platforms currently implementing the portable interceptors specification. Finally, we conclude our work with a case study in which portable interceptors are used to implement the fault-tolerant CORBA client invocation semantic without impacting on the client application code and on the CORBA ORB. We also release fragments of Java code for implementing the described techniques. Copyright (C) 2003 John Wiley Sons, Ltd.

关键词： interceptors CORBA fault-tolerant CORBA middleware performance analysis distributed object computing

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Non-uniform information dissemination for dynamic grid resource discovery

Non-uniform information dissemination for dynamic grid resou...

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3rd IEEE international symposium on Network Computing and applications

作者： Iyengar, V Tilak, S Lewis, MJ Abu-Ghazaleh, NB SUNY Binghamton Dept Comp Sci Binghamton NY 13902 USA

ISBN: (纸本)0769522424

Effective use of computational grids requires up-to-date information about widely-distributed resources within it - a challenging problem given the scale of the grid, and the continously changing state of the resources. We propose non-uniform information dissemination protocols to efficiently propagate information to distributed repositories, without requiring flooding or centralized approaches. Capitalizing on the observation that grid resources are of more interest to nearby users, we disseminate resource information with a frequency and resolution inversely proportional to the distance from the resource. Results indicate a significant reduction in the overhead compared to uniform dissemination to all repositories.

关键词： distributed computer systems

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