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检索条件"任意字段=6th IEEE International Symposium on Object-Oriented Real-Time Distributed Computing"

共 526 条记录，以下是311-320 订阅

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On Dynamic Replication Strategies in Data Service Grids

On Dynamic Replication Strategies in Data Service Grids

引用

international symposium on object-oriented real-time distributed computing

作者： Xiaohua Dong Ji Li Zhongfu Wu Dacheng Zhang Jie Xu Chongqing University China University of Leeds UK

ISBN: (纸本)9780769531328

Service oriented architecture (SOA) allows multiple and heterogeneous data resources to be integrated within a single service while hiding the implementation details and formats of data resources from users of the service. However, data sources for a service are often distributed geographically and connected with long-latency networks; time and bandwidth consumption of data transportation may have an impact on the system performance. Dynamic data replication is a practical solution to this problem. By replicating data copies to appropriate sites, this approach aims to reduce time and bandwidth consumptions over networks. Existing strategies for dynamic replication are typically based on so-called single-location algorithms for identifying a single site for data replication. In this paper we discuss the issues with single-location strategies in large-scale data integration applications, and examine potential multiple-location schemes. Dynamic multiple-location replication is NP-complete in nature. We therefore transform the multiple-location problem into several classical mathematical problems with different parameter settings, for which efficient approximation algorithms exist. Experimental results indicate that unlike single-location strategies our multiple-location schemes are efficient with respect to access latency and bandwidth consumption, especially when the requesters of a data set are distributed over a large scale of locations.

关键词： Service oriented architecture Bandwidth Approximation algorithms Large-scale systems Transportation Large scale integration distributed computing System performance Delay Heuristic algorithms

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Poly Harmonic Staggered Broadcasting Method for Efficient Video on Demand Service

Poly Harmonic Staggered Broadcasting Method for Efficient Vi...

引用

international symposium on object-oriented real-time distributed computing

作者： Sang-Seok Jung Joo-Han Lee Sung-Kwon Park Department of Electrical & Computer Engineering Hanyang University South Korea

ISBN: (纸本)9780769531328

Many research works have focused on developing multimedia applications such as video conferencing and video-on-demand (VoD). From this trend, we see that the VoD service will become the main issue in future. However, service providers don't efficiently provide VoD services for a great number of clients yet. One of the reasons is the high cost in providing VoD services. Because a multimedia service consumes wide bandwidth in spite of great advances of video compression, network bandwidth resource must significantly be spent to maintain multiple clients concurrently. To overcome this problem, we proposed a new transmission method using the broadcast, named as a poly harmonic staggered broadcasting (PHSB) method. the proposed method is an efficient transmission method that has a simple structure of the staggered broadcasting method and substantially improved bandwidth efficiency of the poly harmonic broadcasting method. the numerical results show that the viewer's waiting time of the PHSB method is close to the waiting time of the harmonic broadcasting method which theoretically has the best bandwidth efficiency. Furthermore, the maximum buffer requirements of this can be adapted by adjusting the short front part of a video size.

关键词： Multimedia communication Video on demand Bandwidth Videoconference distributed computing Application software Costs Video compression TV broadcasting Delay

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One approach to combination of FCA-based local conceptual models for text analysis — grid-based approach

One approach to combination of FCA-based local conceptual mo...

引用

international symposium on Applied Machine Intelligence and Informatics (SAMI)

作者： P. Butka M. Sarnovsky P. Bednar Center for Information Technologies Faculty of Electrical Engineering and Informatics Technical University of Kosice Kosice Slovakia

Formal concept analysis (FCA) is one of the approaches which can be applied in process of conceptual modeling in domain of text documents. FCA can be used for formal analysis of data tables and identification of similar objects - clusters (concepts). Extension of classic FCA (binary table data) is one-sided fuzzy version that works with real values in the object-attribute table (document- term matrix in case of vector representation of textual documents). Computational complexity of creation of concept lattices from large context is considerable. this paper describes one simple approach to creation of simple hierarchy of concepts. Starting set of documents is decomposed to smaller sets of similar documents with the use of clustering algorithm. then one concept lattice is built upon every cluster using FCA method and these FCA-based models are combined to simple hierarchy of concept lattices using agglomerative clustering algorithm. For our experiments we used GHSOM algorithm for finding of appropriate clusters, then 'upper neighbors' FCA algorithm was used for building of particular concept lattices. Finally, particular FCA models were labeled by some characteristic terms and simple agglomerative algorithm was used for clustering of local models, with the metric based on these characteristic lattices terms. We have used this approach also to extend it for Grid-based solution in which time consuming building of several local models is distributed between grid computing nodes and then it leads to speed-up of computing of final model.

关键词： Text analysis Lattices Clustering algorithms Data analysis Buildings Grid computing distributed computing Fuzzy sets Information technology Informatics

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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...

引用

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

作者： Becker, Christoph Staamann, Sebastian Salomon, Ralf PrismTech France University of Rostock Germany

ISBN: (纸本)9780769527659

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： object oriented programming

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A novel synchronous scheduling service for CORBA-RT applications

A novel synchronous scheduling service for CORBA-RT applicat...

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

作者： Calvo, Isidro Almeida, Luis Noguero, Adrian Engn Sch Bilbao Dept Syst Engn Bilbao Spain Univ Aveiro DETI IEETA LSE Aveiro Portugal

ISBN: (纸本)9780769527659

Although distributed real-time (RT) systems are intrinsically complex to develop and maintain, the use of certain object-oriented (OO) technologies such as CORBA and CORBA-RT facilitates those tasks. this is the main reason why these technologies are becoming increasingly popular. Moreover, CORBA is complemented with additional services that solve specific requirements for some applications, so developers may concentrate on the application functionality. Following this approach, this paper presents a new service that allows the synchronous scheduling of different activities in a distributed RT system in a simple and flexible way. this paper also explains how this service can be used for optimizing that access to shared resources in a distributed system and presents several experimental data that show the service performance.

关键词： distributed computer systems

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A profile for safety critical Java

A profile for safety critical Java

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

作者： Schoeberl, Martin Sondergaard, Hans thomsen, Bent Ravn, Anders P. Vienna Univ Technol Inst Comp Engn A-1040 Vienna Austria Vitus Bering Denmark Univ Coll DK-8700 Horsens Denmark Aalborg Univ Dept Comp Sci DK-9220 Aalborg Denmark

ISBN: (纸本)9780769527659

We propose a new, minimal specification for real-time Java,for safety critical applications. the intention is to provide a profile that supports programming of applications that can be validated against safety critical standards such as DO-178B[15]. the proposed profile is in line with the Java specification request JSR-302: Safety Critical Java Technology, which is still under discussion. In contrast to the current direction of the expert group for the JSR-302 we do not subset the rather complex real-time Specification for Java (RTSJ). Nevertheless, our profile can be implemented on top of an RTSJ compliant JVM.

关键词： object oriented programming

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QoS management of real-time data stream queries in distributed environments

QoS management of real-time data stream queries in distribut...

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

作者： Wei, Yuan Prasad, Vibha Son, Sang H. Univ Virginia Dept Comp Sci Charlottesville VA 22904 USA

ISBN: (纸本)9780769527659

Many emerging applications operate on continuous unbounded data streams and need real-time data services. Providing deadline guarantees for queries over dynamic data streams is a challenging problem due to bursty stream rates and time-varying contents. this paper presents a prediction-based QoS management scheme for real-time data stream query processing in distributed environments. the prediction-based QoS management scheme features query workload estimators, which predict the query workload using execution time profiling and input data sampling. In this paper, we apply the prediction-based technique to select the proper propagation schemes for data streams and intermediate query results in distributed environments. the performance study demonstrates that the proposed solution tolerates dramatic workload fluctuations and saves significant amounts of CPU time and network bandwidth with little overhead.

关键词： Information management

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Proceedings - 6th ieee international symposium on object-oriented real-time distributed computing, ISORC 2003

Proceedings - 6th IEEE International Symposium on Object-Ori...

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6th ieee international symposium on object-oriented real-time distributed computing, ISORC 2003

ISBN: (纸本)0769519288

the proceedings contain 39 papers. the topics discussed include: model-driven development of real-time software using OMG standards;real time distributed control systems using RTAI;RTC: a real-time communication middleware on top of RTAI-Linux;embedded Linux outlook in the PostPC industry;introduction to the TOPPERS project-open source RTOS for embedded systems;the next generation software platform for mobile phones;compositional design of RT systems: a conceptual basis for specification of linking interfaces;general framework for the description of QoS in UML;towards model-based and CCM-based applications for real-time systems;a cooperative simulation mechanism of distributed control systems based on object-oriented design patterns;issues with object orientation in verifying safety-critical systems;and a systems engineering approach for constructing certifiable real-time distributed systems.

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Combining model processing and middleware configuration for building distributed high-integrity systems

Combining model processing and middleware configuration for ...

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

作者： Hughes, Jerome Zalila, Bechir Pautet, Laurent Telecom Paris GET LTCI UMR 5141CNRS 46Rue Barrault F-75634 Paris 13 France

ISBN: (纸本)9780769527659

Requirements of High Integrity systems now encompass distribution mechanisms along with strong functional and non-functional features (run-time support for hardware, dependability, safety, analyzability). In this paper, we show how model processing help addressing such needs. We present a generic distribution model suitable for High Integrity systems, and demonstrate how a high-level modeling deployment view allows one to greatly reduce the model complexity. Finally, we conclude by assessing a case study.

关键词： Requirements engineering

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Experiences from building service and object replication middleware

Experiences from building service and object replication mid...

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6th ieee international symposium on Network computing and Applications

作者： Osrael, Johannes Froihofer, Lorenz Goeschka, Karl M. Vienna Univ Technol Inst Informat Syst Argentinierstr 8-184-1 A-1040 Vienna Austria

ISBN: (纸本)9780769529226

Replication is a primary means to achieve fault tolerance in distributed systems. While replication techniques are well known and have been widely applied in distributed object and database systems, they have not yet been extensively used in service oriented systems. However if the success of service oriented computing shall continue in critical settings, replication middleware will play a crucial role in service oriented infrastructures. thus, we contribute with a discussion of our experiences in building distributed object and service replication middleware and present the main lessons learned. Our conclusions are drawn from several replication middleware implementations built upon J2EE, NET CORBA, and Axis2.

关键词： Middleware

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