Designing a collaborative architecture for real-timeapplications is an intricate challenge that usually involves dealing with the real-time constraints, resource limitations and complex synchronous problems. In multi...
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ISBN:
(纸本)9780769528793
Designing a collaborative architecture for real-timeapplications is an intricate challenge that usually involves dealing with the real-time constraints, resource limitations and complex synchronous problems. In multi-source collaboration applications, users interact with each other to share their states which are essential for synchronous communication. In this paper, we present real-time multi-participant communication architecture to efficiently manage their interactions in a peer-to-peer fashion. We introduce a graph-theoretic framework for provisioning overlay network based collaboration services to heterogeneous receivers. Considering resource limitations and exploiting geographical positions, the protocol greedily builds degree-constrained minimum-cost connected graph to manipulate the topology to a significant extent by selecting mesh neighbors and changing the metrics. Data delivery routes are picked using dominating set. We named it Dominating Set based Peer-to-Peer Protocol (DS-P2P). simulation is used to manifest that the framework is robust, responsive to tree partitions, and suitable for multi-participant real-time collaboration.
The widespread deployment of the advanced computer technology in business and industries has demanded the high standard on quality of service (QoS). For example. many Internet applications, i.e. online trading, e-comm...
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The widespread deployment of the advanced computer technology in business and industries has demanded the high standard on quality of service (QoS). For example. many Internet applications, i.e. online trading, e-commerce. and real-time databases, etc., execute in an unpredictable general-purpose environment but require performance guarantees. Failure to meet performance specifications may result in losing business or liability violations. As systems become distributed and complex, it has become a challenge for QoS design. The ability of on-line identification and auto-tuning of adaptive control systems has made the adaptive control theoretical design an attractive approach for QoS design. However, there is an inherent constraint in adaptive control systems, i.e. a conflict between asymptotically good control and asymptotically good on-line identification. This paper first identifies and analyzes the limitations of adaptive control for network QoS by extensive simulation studies. Secondly, as an approach to mitigate the limitations, we propose an adaptive dual control framework. By incorporating the existing uncertainty of on-line prediction into the control strategy and accelerating the parameter estimation process, the adaptive dual control framework optimizes the tradeoff between the control goal and the uncertainty, and demonstrates robust and cautious behavior. The experimental study shows that the adaptive dual control framework mitigate the limitations of the conventional adaptive control framework. Compared with the conventional adaptive control framework under the medium uncertainty, the adaptive dual control framework reduces the deviation from the desired hit-rate ratio from 40% to 13%.
The distributed video coding (DVC) is a new coming video compression technology that utilizes a different computing complexity mode from the traditional video codec. As a new paradigm there are some fundamental and ha...
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ISBN:
(纸本)0769529097
The distributed video coding (DVC) is a new coming video compression technology that utilizes a different computing complexity mode from the traditional video codec. As a new paradigm there are some fundamental and hard questions in DVC that are not sufficiently addressed, for example the complexity balance between DVC encoder and decoder. This will be an important factor for some promising realtimeapplications. In this context, this paper studies the factors which affect the decoding complexities of turbo code based DVC especially focuses on quantization, side information and turbo code bit rates. Analyzing and simulation results show that precise side information will decrease the turbo decoding complexity, large reductions in computations can be traded against relatively small increases in bit rate, and uniform quantizer possesses the advantage than the non-uniform quantizer in computation load at a expense of a little decrease in rate distortion performance.
Methods. for publish/subscribe applications over P2P networks have been a research issue for a long time. Many approaches have been developed and evaluated, but typically each based on different assumptions, which mak...
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ISBN:
(数字)9783540716617
ISBN:
(纸本)9783540716600
Methods. for publish/subscribe applications over P2P networks have been a research issue for a long time. Many approaches have been developed and evaluated, but typically each based on different assumptions, which makes their mutual comparison very difficult if not impossible. We identify two design patterns that can be used to implement publish/subscribe applications over structured P2P networks and provide an analytical analysis of their complexity. Based on a characterization of different real-world usage scenarios we present evidence as to which approach is preferable for certain application classes. Finally, we present simulation result's that support our analysis.
The following topics are discussed: distributedsimulation and real-timeapplications; collision detection; interest management and group communication; scheduling and load balancing; grid and Web services; collaborat...
The following topics are discussed: distributedsimulation and real-timeapplications; collision detection; interest management and group communication; scheduling and load balancing; grid and Web services; collaborative virtual environments; time management; and network simulation.
The following topics are dealt with: the construction of simulation engines using advanced computer science technology; techniques for constructing scalable simulations; advanced modeling techniques that allow solutio...
The following topics are dealt with: the construction of simulation engines using advanced computer science technology; techniques for constructing scalable simulations; advanced modeling techniques that allow solution of previously difficult or impossible problem domains; simulation visualization techniques; algorithms and methods for parallel or distributedsimulation, including synchronization, scheduling, memory management, and load balancing; applications of large-scale or distributedsimulation methods; distributedinteractivesimulation and distributed virtual environments; tools and techniques for interoperability of simulations; emulations of real systems; mechanisms for efficient design of experiments.
High level architecture (HLA) is a well-known standard for constructing and supporting large-scale and complex distributedinteractivesimulation systems. HLA has several key components, among which; run-time infrastr...
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High level architecture (HLA) is a well-known standard for constructing and supporting large-scale and complex distributedinteractivesimulation systems. HLA has several key components, among which; run-time infrastructure (RTI) is a crucial one as a service provider engine in HLA based simulation systems. realtime extension of HLA/RTI became very important due to the necessity for the HLA to support simulation components with strict time constraints while interacting with each other. In fact, there have been a lot of research and concerns with regard to designing a high performance RT-RTI. In this paper, we propose a novel RT-RTI design approach that uses realtime Discrete Event System Specification (RT-DEVS) formalism to model and simulate vital experimental frames. We are presenting a case study that demonstrates the usefulness of this formal approach in predicting the key design characteristics through designated simulation experiments. The simulation experimental results show that dynamic thread pool management with our load balancing strategies formed a key in improving the performance of RT-RTI in terms of serving tasks within their deadlines. Through our proposed formal design approach, we have seen an open area in finding the optimal RT-RTI design using RT-DEVS.
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