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proceedings of the Fourth IASTED International Multi-Conference on Wireless and Optical Communications

作者： Chilamkurti, Naveen K. Soh, Ben Gutala, Sri Vijaya Applied Computing Research Institute La Trobe University Melbourne Vic. 3086

ISBN: (纸本)088986411X

Support for video transmission is rapidly becoming a common requirement. Video coding schemes such as H.26L are combined with multilayer multicast protocols such as SPLIT to improve the quality of video received at the receiver. In this paper, we built a simulation system using a modified version of JVT (Joint Video Team) encoding / decoding software package and Network Simulator NS-2, to evaluate H.26L video transmission over SPLIT. System performance was observed in terms of Loss Ratio, Video Jitter, throughput and PSNR for quality of the transmitted video.

关键词： Multicasting

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EASOM: An efficient soft computing method for predicting share values

EASOM: An efficient soft computing method for predicting sha...

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proceedings of the IASTED International Conference on Artificial Intelligence and Applications (as part of the 22nd IASTED International Multi-Conference on applied Informatics

作者： Srinivasa, K.G. Sridharan, Karthik Deepa Shenoy, P. Venugopal, K.R. Patnaik, L.M. Dept. of CSE University Visvesvaraya College of Engineering Bangalore 560001 Microprocessor Applic. Laboratory Indian Institute of Science Bangalore 560012 India

ISBN: (纸本)088986375X

Stock market prediction is a complex and tedious task that involves the processing of large amounts of data, that are stored in ever growing databases. The vacillating nature of the stock market requires the use of data mining techniques like clustering for stock market analysis and prediction. Genetic algorithms and neural networks have the ability to handle complex data and are immune to noise in the input. In this paper, we propose an algorithm Evolutionary Approach to Self Organizing Map(EASOM) to cluster stock market data. Genetic algorithms are used to train the Kohonen network for better and effective prediction. Fuzzy logic is used to fix learning rate for faster convergence. The algorithm was tested on real stock market data of companies like Intel, General Motors, Infosys, Wipro, Microsoft, IBM, etc. The algorithm consistently outperformed regression model, backpropagation algorithm and Kohonen network in predicting the stock market values.

关键词： Data processing

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Vulnerabilities and security threats in structured overlay networks: A quantitative analysis

Vulnerabilities and security threats in structured overlay n...

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20th Annual Computer Security Applications Conference, ACSAC 2004

作者： Srivatsa, Mudhakar Liu, Ling College of Computing Georgia Institute of Technology United States

ISBN: (纸本)0769522521

A number of recent applications have been built on distributed hash tables (DHTs) based overlay networks. Almost all DHT-based schemes employ a tight deterministic data placement and ID mapping schemes. This feature on one hand provides assurance on location of data if it exists, within a bounded number of hops, and on the other hand, opens doors for malicious nodes to lodge attacks that can potentially thwart the functionality of the overlay network. This paper studies several serious security threats in DHT-based systems through two targeted attacks at the overlay network's protocol layer. The first attack explores the routing anomalies that can be caused by malicious nodes returning incorrect lookup routes. The second attack targets the ID mapping scheme. We disclose that the malicious nodes can target any specific data item in the system;and corrupt/modify the data item to its favor. For each of these attacks, we provide quantitative analysis to estimate the extent of damage that can be caused by the attack;followed by experimental validation and defenses to guard the overlay networks from such attacks. © 2004 IEEE.

关键词： Security of data

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Hybrid performance-based workload management for multiclusters and grids

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IEE proceedings-SOFTWARE 2004年第5期151卷 224-231页

作者： He, L Jarvis, SA Spooner, DP Chen, X Nudd, GR Univ Warwick Dept Comp Sci Coventry CV4 7AL W Midlands England

The paper addresses the dynamic scheduling of parallel jobs with quality-of-service demands (soft-deadlines) in multiclusters and grids. Three performance metrics (over-deadline, makespan and idle-time) are combined with variable weights to evaluate the scheduling performance. These three metrics are used to measure the extent to which jobs comply with their QoS demands, the resource throughput and the resource utilisation. Therefore, clusters situated in different administrative organisations can utilise different weight combinations to represent their different performance requirements. Two levels of performance optimisation are applied in the multicluster. At the multicluster level, a scheduler (which we call MUSCLE) allocates parallel jobs with high packing potential to the same cluster;MUSCLE also takes the jobs' QoS requirements into account and employs a heuristic to allocate suitable workloads to each cluster to balance the overall system performance. At the local cluster level, an existing workload manager, called TITAN, utilises a genetic algorithm to further improve the scheduling performance of the jobs sent by MUSCLE. Extensive experimental studies are conducted to verify the effectiveness of the scheduling mechanism in MUSCLE. The results show that, compared with traditional distributed workload allocation policies, the comprehensive scheduling performance (in terms of over-deadline, makespan and idle-time) of parallel jobs is significantly improved across the multicluster.

关键词： Computer communications quality of service resource utilisation distributed workload allocation policies grid computing Local area networks genetic algorithms processor scheduling dynamic scheduling performance optimisation genetic algorithm Distributed systems software workstation clusters Network performance parallel jobs MUSCLE hybrid performance-based workload management TITAN quality-of-service demand performance metrics multicluster-level scheduler resource allocation performance evaluation

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Analysis of spatio-chromatic decorrelation for colour image reconstruction

Analysis of spatio-chromatic decorrelation for colour image ...

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Final Program and proceedings of the IS and T and SID - 12th Color Imaging Conference: Color Science and Engineering: Systems, Technologies, Applications

作者： Drew, Mark S. Bergner, Steven School of Computing Science Simon Fraser University Vancouver BC V5A 1S6 Canada

We investigate the implications of a unified spatio-chromatic basis for image compression and reconstruction. Different adaptive and general methods (PCA, ICA, and DCT) are applied to generate bases. While typically such bases with spatial extent are investigated in terms of their correspondence to human visual perception, we are interested in their applicability to multimedia encoding. The performance of the extracted spatio-chromatic spatial patch bases is evaluated in terms of quality of reconstruction with respect to their potential for data compression. The results discussed here are intended to provide another path towards perceptually-based encoding of visual data. This leads to a deeper understanding of the role played by chromatic features in data reduction.

关键词： Image reconstruction

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Neuro-fuzzy modelling of marine diesel engine cylinder dynamics

Neuro-fuzzy modelling of marine diesel engine cylinder dynam...

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2004 IFAC Conference on Computer Applications in Marine Systems, CAMS 2004

作者： Anionić, Radovan Vukić, Zoran Kuljača, Ognjen Faculty of Maritime Studies Univ. Split Zrinsko-Frankopanska 38 Split21000 Croatia Faculty of Electrical Engineering and Computing Univ. Zagreb Unska 8 Zagreb10000 Croatia Dep. of Advanced Technology School of Agriculture and Applied Sciences Alcorn Slate Univ. 1000 ASU Drive360 United States

In this paper, the practical application of some well recognised fuzzy methods and neural networks techniques to modelling marine diesel engine cylinder dynamics using real-time data and expert knowledge has been considered. The simulation was done in Matlab environment with real-time data originated from 2-stroke marine diesel propulsion engine on test bed during final testing, combined with knowledge elicited from engine experts and experienced test bed operators. Takagi-Sugcno fuzzy model has been designed based on cylinder pressure data after their clustering using fuzzy sub tractive method. Mode! parameter tuning was investigated using ANFIS with combined learning algorithms: least-squares and back-propagation gradient descent method. The model obtained can be of practical importance in engine working regime adjustment, predicting cylinder data in faulty sensor case or adaptive threshold tuning within faults detection and identification. Copyright © 2004 IFAC.

关键词： Fuzzy inference

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An NAT-based communication relay scheme for private-IP-enabled MPI over grid environments

An NAT-based communication relay scheme for private-IP-enabl...

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4th International Conference on Computational Science (ICCS 2004)

作者： Choi, S Park, K Han, S Park, S Kwon, O Kim, Y Park, H Sogang Univ Dept Comp Sci Seoul South Korea Korea Univ Technol & Educ Cheonan South Korea Sookmyung Womens Univ Seoul South Korea Korea Inst Sci & Technol Informat Taejon South Korea

ISBN: (纸本)354022114X

In this paper we propose a communication relay scheme combining the NAT and a user-level proxy to support private IP clusters in Grid environments. Compared with the user-level two-proxy scheme used in PACX-MPI and Firewall-enabled MPICH-G, the proposed scheme shows performance improvement in terms of latency and bandwidth between the nodes located in two private IP clusters. Since the proposed scheme is portable and provides high performance, it can be easily applied to any private IP enabled solutions including the private IP enabled MPICH solution for Globus toolkit.

关键词： Grid computing

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computing reliability for coreference annotation 4

Computing reliability for coreference annotation

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4th International Conference on Language Resources and Evaluation, LREC 2004

作者： Passonneau, Rebecca J. Columbia University Computer Science Department New YorkNY10027 United States

ISBN: (纸本)2951740816

Coreference annotation is annotation of language corpora to indicate wlücti expressions tiave been used to co-specify ttie same discourse entity. Wlien annotations of the same data are collected from two or more coders, the reliability of the data may need to be quantified. Two obstacles have stood in the way of applying reliability metrics: incommensurate units across annotations, and lack of a convenient representation of the coding values. Given N coders and M coding units, reliability is computed from an N-by-M matrix that records the value assigned to unit Mj by coder Nj,. The solution I present accommodates a wide range of coding choices for the annotator, while preserving the same units across codings. As a consequence, it permits a straightforward application of reliability measurement. In addition, in coreference annotation, disagreements can be complete or partial so I incorporate a distance metric to scale disagreements. This method has also been applied to a quite distinct coding task, namely semantic annotation of summaries.

关键词： Reliability

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Property-Oriented Testing: An Approach to Focusing Testing Efforts on Behaviours of Interest 1

Property-Oriented Testing: An Approach to Focusing Testing E...

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Testing of Component-Based Systems and Software Quality, 1st International Workshop on Software Quality, SOQUA 2004 and Workshop Testing Component-Based Systems, TECOS 2004

作者： Li, Shuhao Qi, Zhichang School of Computing Changsha Institute of Technology Hunan Changsha410073 China

ISBN: (纸本)3885793873

The behaviours of reactive systems are characterized by events, conditions, actions, and information flows. Complex reactive systems further exhibit hierarchy and concurrency. Since there usually exist numerous behaviours in such systems, they can hardly receive both comprehensive and in-depth testing. This paper presents a property-oriented testing method for reactive systems. UML state machine is employed to model the system under test (SUT) and temporal logic is used to specify the property to be tested. Targeted test sequences are derived from the model according to the given property. Based on this method, a property-oriented testing tool is implemented. Experiment results indicate that testing efforts can be focused on behaviours of interest of the SUT and thus usually only a small portion of the total behaviours needs to be tested. This method suits well the occasions when the testers have to focus on only critical properties of the SUT in case limited project budget is available. After appropriate extensions, this method can also be applied to real-time systems and systems with parameterized events. © 2004 Gesellschaft fur Informatik (GI). All rights reserved.

关键词： Real time systems

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Sojourn time distributions in modulated G-queues with batch processing

Sojourn time distributions in modulated G-queues with batch ...

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proceedings - First International Conference on the Quantitave Evaluation of Systems, QEST 2004

作者： Harrison, Peter G. Zatschler, Harf Department of Computing Imperial College London

ISBN: (纸本)0769521851

Quantiles on response times, given by probability distribution functions, are a critical metric for quality of service in computer networks as well as many other logistical systems. We derive explicit expressions in the time domain for the sojourn (or response) time probability distribution in a modulated, batched G-queue. More precisely, this queue is Markovian with arrival streams of both positive (normal) and negative customers. Arrivals occur in batches of geometric size and service completions also release batches of geometric size, truncated at the current queue length. All the queue's parameters are modulated by an independent, stationary, continuous time Markov chain. This highly complex queue is able to model many characteristics observed in modern distributed computer systems and telecommunications traffic, such as burstiness, autocorrelation and failures. However, previously, sojourn time distributions have not been obtained even for an MMPP/M/1 queue. We simplify a previous result for their Laplace transform which we then show takes a rational form and can be inverted to give a mixture of exponential and Erlang distributions, possibly modified with sine-factors. An algorithm is described which generates the se functions from any given model parameterization and is applied to a range of problems to illustrate graphically the potentially diverse density functions that ensue. © 2004 IEEE.

关键词： Probability distributions

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