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Available Bandwidth Estimation in IEEE802.11b Network Based on Non-Intrusive Measurement

Available Bandwidth Estimation in IEEE802.11b Network Based ...

引用

IEEE international conference on parallel and distributed computing, Applications and Technologies (PDCAT)

作者： Chen Chen Changxing Pei Liunai An Ministry of Education Xidian University Xi'an China Xidian University Xi'an China

In this paper, we present a nonintrusive and time-based mechanism to estimate the available bandwidth of a node with the nodes collision and backoff stage taken into account. We first give a new definition of available bandwidth in IEEE802.11b network to reflect the collision and contention between nodes. Then, the investigated node obtains the NAV information of its neighbors within the measurement duration through CSMA/CA mechanism and stores the information into its routing buffers. Subsequently, we obtain the available bandwidth of the investigated node by calculate the ratio of its channel accessible time to the measurement duration, which should subtract the sum of NAV values of its neighbors and the backoff time itself from the measurement duration. Simulation shows the proposed scheme is accurate and can completely reflect the collision and contention between nodes

关键词： Bandwidth Time measurement Computer networks Communication system control Decoding Laboratories Computer science education Multiaccess communication Routing Buffer storage

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Message authentication scheme for mobile ad hoc networks

Message authentication scheme for mobile ad hoc networks

引用

international conference on parallel and distributed Systems (ICPADS)

作者： F. Sato H. Takahira T. Mizuno Faculty of Information Shizuoka University Hamamatsu Japan

As wireless ad-hoc networks become feasible, security issues have been important. Because taping and the falsification are easy in a wireless network, and it is difficult to find the attacker, defenses are more difficult than in cable networks. Therefore, a message authentication scheme in wireless networks is becoming important. For wireless ad-hoc networks, it is necessary to reduce signature information, etc. which become overheads in narrow wireless communication. In addition, since an ad hoc network is often achieved with mobile terminals, a security scheme which does not need computation power and any complex mechanism is required. In this paper, we propose two efficient message authentication schemes which improve the performance of conventional schemes. In our scheme, the hash calculation time and overhead of the packet is less than the conventional method. The simulation results show that our schemes have a better packet authentication rate in a burst error environment than conventional methods.

关键词： Message authentication Mobile ad hoc networks Ad hoc networks Communication system security Wireless networks Wireless communication Mobile computing Information security Computer networks Computational modeling

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Heterogeneity Issues and Supports in MPI Implementations: An Overview

Heterogeneity Issues and Supports in MPI Implementations: An...

引用

international conference on Grid and Cooperative computing (GCC)

作者： Yan-Huang Jiang Qiang-Li Zhao Yu-Tong Lu Xue-Jun Yang Sch. of Comput. Sci. Nat. Univ. of Defense Technol. Changsha China

Diverse computers interconnected via mixed network equipments are commonly available parallel architecture now, and achieve good performance/price ratio. As an important parallel communication tool, MPI system is a natural choice to support heterogeneous computing platform. The paper classifies the definition of heterogeneity into three categories, and presents the issues of them in detail respectively. Then overviews the heterogeneous support in eight MPI implementations. Comparison and analysis results are given from several aspects at last.

关键词： Computer networks Protocols Concurrent computing distributed computing Supercomputers Grid computing parallel architectures High performance computing Message passing Computer errors

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Evaluation of a Small Scale Cluster computing System for parallel Intelligent Techniques Applications

Evaluation of a Small Scale Cluster Computing System for Par...

引用

international conference on Machine Learning and Cybernetics (ICMLC)

作者： Chun-Che Fung Jia-Bin Li Myers Centre for Enterprise Collaboration in Innovative Systems School of IT Murdoch University WA USA Centre for Enterprise Collaboration in Innovative Systems School of IT Murdoch University WA Australia Department of Electrical and Computer Engineering Curtin University of Technology WA USA

A small scale distributed computing system that is able to meet the needs of parallel intelligent techniques for engineering and science applications is reported in this paper. The reported system is a cluster of general-purpose PCs interconnected in a network. Such systems are powerful yet low cost. While such systems are not new, most applications written for cluster systems are programmed in MPI-C. Results from the proposed system have shown that it is advantageous to use Java due to its simplicity and mobility. Hence, the goal of this research is to design a Java-based parallel platform for efficient execution of intelligent techniques for engineering and science applications on a cluster system.

关键词： Concurrent computing Intelligent systems Java Power engineering computing distributed computing Power engineering and energy Personal communication networks Power system interconnection Costs Design engineering

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CrownFS: a clustered continuous media server

CrownFS: a clustered continuous media server

引用

international conference on parallel and distributed Systems (ICPADS)

作者： Young-Sung Son Yu-Seok Bae Oh-Young Kwon Tae-Geun Kim Chang-Soon Park Network Computing Department Systems Engineering Research Institute Taejon South Korea

ISBN: (纸本)0818682272

CrownFS is a file system for continuous media server in the CROWN (Clustering Resources On Workstations' Network) system. Because of the high I/O bandwidth rate and strict real-time constraints, the design issues of CrownFS are that of efficiently balancing user load against limited disk: bandwidth, network and I/O channel bandwidth. CrownFS accomplishes this balancing by striping continuous data file across several workstations and computing at each workstation in the CROWN system. This paper describes the CROWN system architecture and the CrownFS design. CrownFS runs on a cluster of workstations consisted of Kawaiis, AlphaStations and PCs.

关键词： Network servers Workstations Bandwidth Personal communication networks Costs Streaming media File systems Systems engineering and theory File servers Hardware

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Designing an Independent Study to Create HPC Learning Experiences for Undergraduates

Designing an Independent Study to Create HPC Learning Experi...

引用

IEEE international conference on High Performance computing Workshops (HiPCW)

作者： Sandino Vargas-Pérez Department of Computer Science Kalamazoo College Kalamazoo MI USA

This paper aims to present a multi-tiered approach to designing learning experiences in HPC for undergraduate students that significantly reinforce comprehension of CS topics while working with new concepts in parallel and distributed computing. The paper will detail the experience of students working in the design, construction, and testing of a computing cluster including budgeting, hardware purchase and setup, software installation and configuration, interconnection networks, communication, benchmarking, and running parallel code using MPI and OpenMP. The case study of building a relatively low-cost, small-scale computing cluster that can be used as a template for CS senior projects or independent studies, also yielded an opportunity to involve students in the creation of teaching tools for parallel computing at many levels of the CS curriculum.

关键词： Computer science parallel programming Education Taxonomy Hardware Supercomputers Software

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Effect of change in rate of genetic algorithm operator on composition of signatures for misuse intrusion detection system

Effect of change in rate of genetic algorithm operator on co...

引用

international conference on parallel distributed and Grid computing (PDGC)

作者： Mayank Kumar Goyal Alok Aggarwal Neelam Jain Department of Information Technology Sharda University Greater Noida India Department of Computer Science JPIET Meerut India Department of Computer Science MGMCET Noida India

Intrusion detection (ID) has become an important area of research since building a system with no vulnerabilities has not been technically feasible. In this paper, effect of change in rate of genetic algorithm operator on fitness value in composition of signatures for misuse intrusion detection system is presented. The proposed genetic algorithm uses a set of classification rules which are generated from a predefined intrusion behavior. From the results it could be concluded that if crossover performed is not sufficient, there is not sufficient sharing of genes. If we crossover too much, good segments of individuals get split up a lot. This allows some individuals with high fitness's to be copied directly to the next population.

关键词： Sociology Statistics Biological cells IP networks Protocols Simple object access protocol Wires

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An optimal deadlock resolution algorithm in multidatabase systems

An optimal deadlock resolution algorithm in multidatabase sy...

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international conference on parallel and distributed Systems (ICPADS)

作者： Xuemin Lin Jian Chen Department of Computer Science University of Western Australia Perth WA Australia Department of Software Development Monash University Melbourne VIC Australia

ISBN: (纸本)0818672676

In this paper, we propose a novel deadlock resolution algorithm. In the presence of global deadlocks in a multidatabase system, this algorithm always selects an optimal set of victims for removing deadlocks. It makes use of network flow techniques, and runs in time O(n/sup 3/), where n is the number of the deadlocked global transactions. Furthermore, the proposed deadlock resolution algorithm does not have livelock and transaction processing starvation problems.

关键词： System recovery Concurrency control Database systems Transaction databases Costs Computer science Communication networks Concurrent computing Software development management Programming

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Optimizing Transformer Training Based on Computation and Accessing Memory Features with Deep Learning Processor

Optimizing Transformer Training Based on Computation and Acc...

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international conference on parallel and distributed Systems (ICPADS)

作者： Zhou Lei Qin Fang Jingfeng Qian Shengbo Chen Qingguo Xu Ninghua Yang School of Computer Engineering and Science Shanghai University Shanghai China Ningbo Zhongke Intelligent Computing Technology Co. Ltd Zhejiang China

The Transformer model, which has significantly advanced natural language processing and computer vision, overcomes the limitations of recurrent neural networks and convolutional neural networks. However, it faces challenges with computational efficiency and memory management due to complex computations and variable-length inputs. Despite research efforts, these issues persist. This paper presents a novel optimization of the Transformer model, following an indepth analysis of its computational graph structure. Firstly, we utilize Deep computing Unit (DCU) as our hardware platform. Secondly, we optimize element-wise and reduction operators through operator fusion and rewriting. Thirdly, we develop a fine-grained memory management algorithm using a greedy strategy. As a result, the training speed of the Transformer model increases by 1.2x - 1.4x without compromising accuracy.

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On simplification of chaotic neural network on incremental learning

On simplification of chaotic neural network on incremental l...

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ACIS international conference on Software Engineering, Artificial Intelligence, Networking, and parallel/distributed computing (SNPD)

作者： Toshinori Deguchi Toshiki Takahashi Naohiro Ishii Dept. of Electrical and Computer Engineering Gifu National College of Technology Motosu Gifu-pref Japan Dept. of Information networking engineering Aichi Institute of Technology Yachigusa Yakusa-cho Toyota Japan

The incremental learning is a method to compose an associate memory using a chaotic neural network and provides larger capacity than correlative learning in compensation for a large amount of computation. A chaotic neuron has spatiotemporal sum in it and the temporal sum makes the learning stable to input noise. When there is no noise in input, the neuron may not need temporal sum. In this paper, to reduce the computations, a simplified network without temporal sum are introduced and investigated through the computer simulations comparing with the network as in the past. It turns out that the simplified network has the same capacity to and can learn faster than the usual network.

关键词： Neurons Biological neural networks Noise Noise measurement Electronic mail Computational complexity

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