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An agent-based protocol to support multimedia communication in ad hoc wireless networks 15

An agent-based protocol to support multimedia communication ...

引用

15th International Parallel and Distributed Processing symposium, IPDPS 2001

作者： RoyChoudhury, R. Paul, K. Bandyopadhyay, S. Dept. of Computer Science HaldiaInstitute of Technology West Bengal India CTS Sector V Saltlake Calcutta700 091 India PricewaterhouseCoopers Ltd. Sector V Saltlake Calcutta700091 India

ISBN: (纸本)0769509908

Realizing high volume real time communication in a highly dynamic architecture like Mobile Ad hoc Networks (MANET) still remains a major point of research. In this paper, we have attempted to address the issue of maintaining an uninterrupted session between a source and a destination through multiple paths in a temporal domain. We have tried to develop an agent-centric protocol that would accomplish multimediacommunication over adaptively selected routes. the protocol ensures minimal consumption of network resources. We have organized this work in two logical steps. In the first part, we have devised an agent-based framework with its associated protocols and mechanisms. the agents in the framework move from one node to another in the MANET architecture. the primary objective of this mobile multi-agent framework is to asynchronously collect network topology information (like node velocity, node location etc.) and distribute them into the information cache of all other nodes. this is accomplished proactively with the aim of making all nodes in the system topology-aware. the second part of the work attempts to make use of this topology awareness in the context of establishing and maintaining a communication link between two nodes. the agent-enabled proactive replenishment of fresh topology information enables the node to constantly evaluate network conditions. © 2001 IEEE.

关键词： Mobile ad hoc networks

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Flow generation for IP/ATM label-switched routing over random networks 15

Flow generation for IP/ATM label-switched routing over rando...

引用

15th International Parallel and Distributed Processing symposium, IPDPS 2001

作者： Harwood, A. Shen, Hong School of Computing and Information Technology Griffith University NathanQLD4111 Australia

ISBN: (纸本)0769509908

We address the problem of generating ATM labels which facilitates IP packet flow through the network. We define the virtual flow topology and provide a stochastic algorithm GFLOW, that generates labels for virtual connections using periodic broadcasts providing simple and efficient robustness and oblivious execution. For a random network with N nodes of average degree d¯ and dimeter Θ(k), we demonstrate how our algorithm can be used to generate a mean l=1+(k-1)d¯ labels at each node to provide a probability Θ(1/N) that any pair of nodes will have a virtual connection between them. We show that with probability roughly 1/2 +1/2N any node may route a message along a virtual connection which terminates within an Ε-neighborhood of the destination, where Ε=Θ(logd¯ (N/k)), with l as stipulated. Of course the number of labels generated at each node is variable and directly relates to the cost in such a way that a network administrator can trade label space for increased performance. We provide simulation results using Matlab mathematical language interpreter that supports our analysis. © 2001 IEEE.

关键词： Internet protocols

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Fault-tolerant embedded computer system-on-chip for endoscope control

Fault-tolerant embedded computer system-on-chip for endoscop...

引用

9th International symposium on Integrated Circuits, Devices and Systems, ISIC 2001: Proceedings - Low Power and Low Voltage Integrated Systems

作者： Khan, Gul N. Wee, Siew Hoon Dept. of Elec. and Comp. Engineering Ryerson University 350 Victoria Street Toronto Ont. M5B 2K3 Canada Innomedia Pte Ltd 10 Science Park Road 03-04 SSP II Singapore 117684 Singapore

the processor architecture of a fault tolerant embedded system is presented, which implements a machine vision based navigation system of a colonoscope. the automation of colonoscopy requires high performance computing for image analysis and navigation while fault-tolerance for patient safely. high performance computing and real-time control is achieved by a hardware engine of heterogeneous multiple processors. the software architecture consists of system as well as application level endoscope control processes. the target architecture adapts itself to the varying needs of machine vision and navigation algorithms. Embedded system development is a hardware software codesign problem where the hardware and software architectures are designed simultaneously. the virtual hardware system is constructed using HDL-based virtual processor cores and other hardware modules. the system and application software is developed and co-verified with the virtual hardware using Eagle;toolset. the hardware software co-verification results indicate that the system performance degrades gracefully under various fault scenarios.

关键词： Microprocessor chips

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Frequency interpolation methods for accelerating parallel EMC analysis 15

Frequency interpolation methods for accelerating parallel EM...

引用

15th International Parallel and Distributed Processing symposium, IPDPS 2001

作者： Homma, K. Nagase, K. Noro, M. Strazdins, P.E. Yamagajo, T. Secure Computing Laboratory Computer System Laboratories Fujitsu Laboratories Ltd. Japan Technology Development Group Fujitsu Ltd. Japan Department of Computer Science Australian National University Australia

ISBN: (纸本)0769509908

Electro-magnetic field analysis applications based on the Method of Moments can be used to simulate the emissions for electrical devices such as a printed circuit board, a combination of circuit boards and wire connecting boards, or even a cabinet. At the heart of such applications is a solver, which solves a symmetric indefinite dense linear system of size N assembled from the model of the electrical device. the main computational challenges lie in the solver stage, where an O(N3) computation is required for the direct solution of the linear system about a central frequency ωc. For the direct solution we use a general symmetric matrix factorization algorithm, requiring N3/3 + O(N2) FLOPs. this algorithm's efficiency is demonstrated by its parallel speedup of 5 for moderate sized matrices on an 8 node AP3000. Some of this cost can be amortized using the fast frequency stepping method, where the system can be solved for nearby frequencies ω by O(N2) iterative methods, using the solution at ωc as a preconditioner. Due to the high parallel efficiency of the direct method, the frequency stepping method reduced parallel solution time by a factor of 2 for moderate-sized matrices, with larger improvements expected for large matrices. © 2001 IEEE.

关键词： Matrix algebra

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Parallel out-of-core cholesky and QR factorizations with POOCLAPACK 15

Parallel out-of-core cholesky and QR factorizations with POO...

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15th International Parallel and Distributed Processing symposium, IPDPS 2001

作者： Gunter, B.C. Reiley, W.C. Van De Geijn, R.A. Center for Space Research University of Texas AustinTX78712 United States Department of Computer Sciences University of Texas AustinTX78712 United States

ISBN: (纸本)0769509908

In this paper the parallel implementation of out-of-core Cholesky factorization is used to introduce the Parallel Out-of-Core Linear Algebra Package (POOCLAPACK), a flexible infrastructure for parallel implementation of out-of-core linear algebra operations. POOCLAPACK builds on the Parallel Linear Algebra Package (PLAPACK) for in-core parallel dense linear algebra computation. Despite the extreme simplicity of POOCLAPACK, the out-of-core Cholesky factorization implementation is shown to achieve up to 80% of peak performance on a 64 node configuration of the Cray T3E-600. the insights gained from examining the Cholesky factorization are also applied to the much more difficult and important QR factorization operation. Preliminary results for parallel implementation of the resulting OOC QR factorization algorithm are included. © 2001 IEEE.

关键词： Factorization

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Evolving the Web-based distributed SI/PDO architecture for high-performance visualization

Evolving the Web-based distributed SI/PDO architecture for h...

引用

34th Annual Simulation symposium

作者： Holmes, VP Linebarger, JM Miller, DJ Vandewart, RL Crowley, CP Sandia Natl Labs Albuquerque NM 87185 USA

ISBN: (纸本)0769510922

We have extended the SI/PDO architecture to allow web access to visualization tools running on MP systems. We make these tools more easily accessible by providing web-based interfaces and by shielding the user from the details of these computing environments. We use a multi-tier architecture, where the Java-based GUI tier runs on a web browser and provides image display and control functions. the visualization tier runs on MP machines. the middle tiers provide custom communication with MP machines, remote file selection, remote launching of services, and load balancing. the system allows for adding and removing of tiers depending upon the situation. this architecture is based on the requirements of our environment: huge data volumes (that cannot be easily moved), use of multiple middleware protocols, MP platform portability, rapid development of the visualization tools, distributed resource management (of MP resources), and the use of existing visualization tools.

关键词： Distributed computer systems

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An efficient association mining implementation on cluster of SMPs 15

An efficient association mining implementation on cluster of...

引用

15th International Parallel and Distributed Processing symposium, IPDPS 2001

作者： Jin, Ruoming Agrawal, G. Department of Computer and Information Sciences University of Delaware NewarkDE19716 United States

ISBN: (纸本)0769509908

In this paper, we present our experiences in implementing a hierarchical parallel version of apriori association mining using a middleware. the middleware supports both shared memory and distributed memory parallelization, and enables high I/O performance. Our experimental results on a cluster of SMPs show that: 1) distributed memory parallelization achieves very high efficiency, 2) shared memory parallelization achieves good efficiency if the application is not I/O bound, and 3) the processing time required per data item remains almost the same as the dataset size is increased, establishing that efficient processing of disk resident datasets is possible. © 2001 IEEE.

关键词： Middleware

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A case for economy grid architecture for service oriented grid computing 15

A case for economy grid architecture for service oriented gr...

引用

15th International Parallel and Distributed Processing symposium, IPDPS 2001

作者： Buyya, R. Abramson, D. Giddy, J. School of Computer Science and Software Engineering Monash University Caulfield Campus Melbourne Australia CRC for Enterprise Distributed Systems Technology Monash University Caulfield Campus Melbourne Australia

ISBN: (纸本)0769509908

Computational Grids are a promising platform for executing large-scale resource intensive applications. However, resource management and scheduling in the Grid environment is a complex undertaking as resources are (geographically) distributed, heterogeneous in nature, owned by different individuals or organizations with their own policies, have different access and cost models, and have dynamically varying loads and availability. this introduces a number of challenging issues such as site autonomy, heterogeneous interaction, policy extensibility, resource allocation or co-allocation, online control, scalability, transparency, resource brokering, and "computational economy". A number of Grid systems (such as Globus and Legion) have addressed many of these issues with exception of a computational economy. We argue that a computational economy is required in order to create a real world scalable Grid because it provides a mechanism for regulating the Grid resources demand and supply. It offers incentive for resource owners to be part of the Grid and encourages consumers to optimally utilize resources and balance timeframe and access costs. We propose a 'computational economy framework' that builds on the existing Grid middleware systems and offers an infrastructure for resource management and trading in the Grid environment. We discuss the usage economic models for resource trading in the Nimrod/G resource broker and present deadline and cost-based scheduling experimental results on the Grid. © 2001 IEEE.

关键词： Grid computing

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Efficient fault-tolerant protocol for mobility agents in mobile IP 15

Efficient fault-tolerant protocol for mobility agents in mob...

引用

15th International Parallel and Distributed Processing symposium, IPDPS 2001

作者： Ahn, JinHo Hwang, ChongSun Department of Computer Science and Engineering Korea University 5-1 Anam-dong Seoul136-701 Korea Republic of

ISBN: (纸本)0769509908

As the number of mobile nodes registering with a network rapidly increases in Mobile IP, multiple mobility (home or foreign) agents can be allocated to each network in order to improve performance and availability. Previous fault-tolerant protocols to mask failures of the mobility agents have used passive replication techniques. However, they result in high failure-free latency during registration process if the number of mobility agents in the same network increases, and force each mobility agent to manage bindings of all the mobile nodes registering with its network. In this paper, we present a new fault-tolerant protocol using checkpointing and receiver-based pessimistic message logging techniques. the protocol achieves low failure-free latency even if the number of mobility agents in a network increases and improves scalability to a large number of mobile nodes registering with each network compared with the previous protocols. Additionally, the protocol allows each failed mobility agent to recover bindings of the mobile nodes registering with the mobility agent when it is repaired even if all the other mobility agents in the same network concurrently fail. © 2001 IEEE.

关键词： Mobile agents

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performance of scheduling scientific applications with adaptive weighted factoring 15

Performance of scheduling scientific applications with adapt...

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15th International Parallel and Distributed Processing symposium, IPDPS 2001

作者： Banicescu, I. Velusamy, V. Department of Computer Science NSF Engineering Research Center for Computational Systems Mississippi State University United States

ISBN: (纸本)0769509908

Dynamic scheduling algorithms are a powerful tool towards performance improvement via load balancing scientific applications in heterogeneous environments. However, these scheduling techniques employ heuristics that require a priori knowledge about workload via profiling resulting in higher overhead as problem sizes and number of processors increase. In addition, load imbalance may appear only at run-time, making profiling work tedious and sometimes even obsolete. this paper reports on performance improvements obtained by integrating a recently proposed dynamic loop scheduling technique that addresses these concerns, the Adaptive Weighted Factoring, into two scientific applications. the first application involves computational field simulation on unstructured grids, and the second one is N-body simulation. Reported experimental results on computational field simulation problems using unstructured grids and ongoing work on N-body simulations confirm the benefits of using this methodology, and emphasize its high potential for future integration in other scientific applications that exhibit substantial performance degradation due to load imbalance. © 2001 IEEE.

关键词： Scheduling algorithms

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