In this paper a not, model for communication in MANETs will be presented. Instead of omnidirectional transmissions, as assumed in most papers and all existing systems, the members are allowed to submit data in a fixed...
ISBN:
(纸本)0769514448
In this paper a not, model for communication in MANETs will be presented. Instead of omnidirectional transmissions, as assumed in most papers and all existing systems, the members are allowed to submit data in a fixed number of different directions (sector subdivision) and to adjust the transmission power in each sector separately. A simulation environment (simulation Environment for Ad Hoc Networks, SAHNE) will be presented that allows simulation of communication strategies in MANETs that use sector subdivision, and simulation results will be shown where communication paths are selected via hop-minimization or geometric spanner properties. SAHNE is based on C++ and common libraries, which ensures that it can be used on many different platforms. The experiments show the influence of different parameters in realistic scenarios, and using geometric routing seemed to be better than using hop-minimization.
Group communication system (GCS) is a useful mechanism for constructing reliable, fault-tolerant distributed application, When GCS is extended in mobile environment, the membership change occurs frequently due to the ...
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ISBN:
(纸本)0769515762
Group communication system (GCS) is a useful mechanism for constructing reliable, fault-tolerant distributed application, When GCS is extended in mobile environment, the membership change occurs frequently due to the mobility of mobile nodes and unreliable wireless communication within a cell. In this paper, we propose a scalable group communication scheme to support mobile systems in an Internet environment with wireless cells. Our scheme leverages the layered approach, our previous work, to enhance the scalability. Furthermore, to shield group view from the mobility and temporary disconnection of mobile hosts, we extend the hierarchical view management of layered approach. The simulation result shows that our scheme can reduce the overhead of membership management and the number of messages exchanged to complete the view event process.
A technique called updateable simulations is proposed to reduce the time to complete multiple executions of a discrete event simulation program. This technique updates the results of a prior simulation run rather than...
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We describe a novel approach to scalability and efficiency of parallel network simulation that partitions the networks into domains and simulation time into intervals. Each domain is simulated independently of and con...
This paper presents a scalable architecture for supporting large-scale interactive Internet games. In order to support a large number of participants and to divide the workload, the virtual world is divided into parti...
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IBM, like other major companies, is developing large compute servers. These servers run typically various applications supported on a variety of different operating systems. To support all the user scenarios the syste...
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There are many mapping schemes proposed in previous research on parallel proxy servers. The operations of these schemes are mainly, URL-based, and therefore cannot fully benefit from the new persistent connection feat...
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ISBN:
(纸本)0769515886
There are many mapping schemes proposed in previous research on parallel proxy servers. The operations of these schemes are mainly, URL-based, and therefore cannot fully benefit from the new persistent connection feature of HTTP/1.1. In this paper, we propose a site-based mapping scheme that forwards all requests targeting on the same web site to the same proxy server. The scheme then allows the proxy to use a single persistent connection to serve many client requests. The major advantage of the scheme is the reduction in the number of connection establish in en is. This reduction can save network bandwidth and reduce the user-experienced latency. simulation results show that the proposed site-based scheme reduces 40%-70% of the connection setups and teardowns when compared to a traditional URL-based mapping scheme.
The proceedings contain 20 papers. The topics discussed include: a load management system for running HLA-based distributedsimulations over the grid;PERFOSIM: a performance evaluation tool for HLA distributed simulat...
ISBN:
(纸本)0769518532
The proceedings contain 20 papers. The topics discussed include: a load management system for running HLA-based distributedsimulations over the grid;PERFOSIM: a performance evaluation tool for HLA distributedsimulations;bridging the HLA: problems and solutions;a next-generation internet federation object model for the HLA;automatic construction of hierarchical federations architecture;trade-offs in overhead vs. effectiveness of causality inconsistency tracking for preemptive rollback in optimistic simulation;performance evaluation of real time schedulers for a multicomputer;performance trade-off in distributedsimulation;using a software architecture description language to model the architecture and run-time performance of a federate;and software design for implementation of the selectively reliable multicast protocol.
This paper describes a full-wave EMI (electromagnetic interference) simulator for the new methodology of printed wiring board (PWB) design with the consideration of electromagnetic compatibility (EMC) and signal integ...
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We introduce a technique that reduces the number of state savings and the maximum memory needed for the Time Warp. We present a technique to determine if an event is safe or not. If an event execution is safe, no stat...
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