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Symposia and Workshops on Ubiquitous, Autonomic and Trusted computing, UIC-ATC

作者： Yanrong Ding Xiaodong Wang Hu Shen Pengyu Guo National Key Laboratory for Parallel and Distributed Processing Changsha China

Nested Circular Directional MAC, a modified medium access control protocol of DMAC protocol, is proposed in this paper to support both directional antennas and omni-directional antennas simultaneously in one Ad Hoc network. Omni-directional antennas follow the RTS/CTS mechanism which is multi-hop and directional antennas follow the DRTS/DCTS mechanism, ensuring the asymmetric communication effectively. In order to resolve new deafness problem and hidden terminal problem, the directional antennas also use circular DRTS and nested antenna circumrotation. Simulation results show that NCDMAC supports hybrid antennas effectively and is better than MMAC and Circular-MAC in terms of increasing throughput, but it also increases the communication delay.

关键词： Delay Deafness Directive antennas throughput Directional antennas Media Access Protocol

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A centrally coordinated parallel auction algorithm for large scale assignment problems

A centrally coordinated parallel auction algorithm for large...

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the international Conference on Informatics and Systems (INFOS)

作者： Amgad Naiem Mohammed El-Beltagy Mohamed Rasmy Cairo University Egypt

ISBN: (纸本)9781424458288;9789774033964

We present a novel parallel auction algorithm implementation for solving the linear sum assignment problem. It is implemented using the message passing interface (MPI) on a computer cluster. Our approach enables dynamic computational load balancing over all processors throughout all steps of the algorithm's execution. We show that the performance of our approach is superior to existing approaches in the literature.

关键词： Large-scale systems Clustering algorithms Scalability Peer to peer computing Message passing Computer interfaces Load management Application software distributed computing Integer linear programming

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the 9th international Workshop on Performance Modeling, Evaluation, and Optimization of Ubiquitous computing and Networked Systems (PMEO-UCNS-10)

Proceedings of the 2010 IEEE International Symposium on Para...

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Proceedings of the 2010 IEEE international symposium on parallel and distributed Processing, Workshops and Phd Forum, IPDPSW 2010 2010年

作者： Min, Geyong Ould-Khaoua, Mohamed Department of Computing University of Bradford Bradford BD7 1DP United Kingdom Department of Electrical and Computer Engineering Sultan Qaboos University Oman

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Centralized synchronization methods for distributed detection in sensor networks

Centralized synchronization methods for distributed detectio...

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international symposium on Wireless Communication Systems (ISWCS)

作者： Ignacio Olabarrieta Javier Del Ser TECNALIA-Telecom Zamudio Spain

We consider a network of distributed sensors which simultaneously measure a physical parameter of interest, subject to a certain sensing error probability. the sensed information at each of such nodes is forwarded to a central receiver through parallel independent AWGN channels. In this scenario the signals from different sensors can arrive at the central receiver at different instants of time each subject to a different time delay. In order to properly fuse the streams of data arriving from different sensors these streams need to be synchronized. In this paper we propose and compare, via numerical simulations, several new synchronization mechanisms specifically tailored for this setup.

关键词： Delay Synchronization Receivers Sensors Error probability Binary phase shift keying Demodulation

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Addressing manufacturing challenges with cost-efficient fault tolerant routing

Addressing manufacturing challenges with cost-efficient faul...

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4th ACM/IEEE international symposium on Networks on Chip, NOCS 2010

作者： Rodrigo, S. Flich, J. Roca, A. Medardoni, S. Bertozzi, D. Camacho, J. Silla, F. Duato, J. Parallel Architectures Group Technical University of Valencia Valencia Spain ENDIF Department of Engineering University of Ferrara Ferrara Italy

ISBN: (纸本)9780769540535

the high-performance computing domain is enriching with the inclusion of Networks-on-chip (NoCs) as a key component of many-core (CMPs or MPSoCs) architectures. NoCs face the communication scalability challenge while meeting tight power, area and latency constraints. Designers must address new challenges that were not present before. Defective components, the enhancement of application-level parallelism or power-aware techniques may break topology regularity, thus, efficient routing becomes a challenge. In this paper, uLBDR (Universal Logic-Based distributed Routing) is proposed as an efficient logic-based mechanism that adapts to any irregular topology derived from 2D meshes, being an alternative to the use of routing tables (either at routers or at end-nodes). uLBDR requires a small set of configuration bits, thus being more practical than large routing tables implemented in memories. Several implementations of uLBDR are presented highlighting the trade-off between routing cost and coverage. the alternatives span from the previously proposed LBDR approach (with 30% of coverage) to the uLBDR mechanism achieving full coverage. this comes with a small performance cost, thus exhibiting the trade-off between fault tolerance and performance. © 2010 IEEE.

关键词： Fault tolerance

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Self-organization in 4G mobile networks: Motivation and vision

Self-organization in 4G mobile networks: Motivation and visi...

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international symposium on Wireless Communication Systems (ISWCS)

作者： Ulrich Barth Edgar Kuehn Radio System Optimization Department Alcatel-Lucent Bell Laboratories Stuttgart Germany

Self-organization is a key factor for the future evolution of mobile networks, especially for introduction of the new radio standard LTE. Reasons are the increasing complexity, heterogeneity and management effort. Based on an overview about the current state of the art, the self-organization potential for enabling real plug and play functionality, automatic network optimization, improved end-to-end QoS and new energy saving technologies is highlighted. this is especially true for the upcoming trend towards small cell deployments. Our vision is an essentially simplified network management architecture relying on a distributed self-organization functionality which enables large steps towards autonomous operation of network elements.

关键词： Optimization Mobile communication Mobile computing Interference Base stations Radio access networks throughput

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A new development of public key cryptosystem

A new development of public key cryptosystem

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international symposium on Communication Systems, Networks and Digital Signal Processing, CNSDSP

作者： Xiao Bo Yang Said Boussakta Mohammed Al-Gailani School of Electrical Electronic and Computing Engineering University of Newcastle Newcastle-upon-Tyne UK

A public-key encryption algorithm and a practical hybrid scheme are proposed in this paper. this algorithm uses the advanced transform techniques, i.e. the Number theoretic Transforms (NTTs) to diffuse data, and uses a non-linear technique based on the Elliptic Curve Discrete Logarithm Problem (ECDLP) to confuse data. the main advantage of the proposed algorithm is its high efficiency and capability. the plaintext can be encrypted in blocks in parallel, thus saves computational time. the proposed algorithm also can be easily applied in a hybrid scheme for practical applications.

关键词： Transforms Elliptic curves Elliptic curve cryptography Encryption

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A parallel Branch and Bound algorithm for solving large scale integer multiobjective problems

A parallel Branch and Bound algorithm for solving large scal...

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the international Conference on Informatics and Systems (INFOS)

作者： Mahmoud M. Ismail Waiel F. Abd El-Wahed Osama abd el-raoof Faculty of Computers and Information Systems Operations Research Department Zagazig Egypt Operations Research Decision Support Faculty of Computers and Information Menoufia University Egypt

ISBN: (纸本)9781424458288;9789774033964

the multi-objective integer programming problems in large scale are considered time consuming. In the past, mathematical structures were used that can get benefits of high processing powers and parallel processing. the Branch and Bound (B&B) algorithm is one of the most used methods to solve combinatorial optimization problems. A general approach to generate all non-dominated solutions of the multi-objective integer programming (MOIP) Problem is developed. In this paper, a supervisor-master-sub-master-worker algorithm to solve large scale integer multi-objective problems that can get the benefits of mathematical structures and high processing powers has been proposed. this approach addresses several issues related to the characteristics of the algorithm itself and the properties of parallel computing systems. From the solved benchmark example this algorithm proved to provide a considerable high performance. Results show that a consistently better efficiency can be achieved in solving integer equations, providing reduction of time.

关键词： Large-scale systems Linear programming Concurrent computing parallel processing Operations research distributed computing Optimization methods Mathematical programming Information systems Equations

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Dynamic task scheduling using fuzzy logic in distributed memory systems

Dynamic task scheduling using fuzzy logic in distributed mem...

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the international Conference on Informatics and Systems (INFOS)

作者： Fatma A. Omara Rasha M. Zohier Computer Science Department Faculty of Computer & Information Cairo University Egypt Computer Science Department Institute of Statistical Studies and Research Cairo University Egypt

ISBN: (纸本)9781424458288;9789774033964

the scheduling and mapping of the precedence-constrained task graphs of parallel programs to processors is considered one of the most crucial NP-complete problems in parallel and distributed computing systems. In this paper, a dynamic task scheduling model based on fuzzy logic is proposed. the main objective of this technique is to improve the fuzzy decision which is used in task scheduling on a network of processing elements by introducing new input parameters to an existing fuzzy model and, in the same time, improving the load balance on the network in a dynamic environment. the proposed Fuzzy Model is capable of processing inputs from on the fly data that arises from the current state of the processors. According to the proposed model, tasks are generated randomly and are served based on the First-Come-First-Serve rule. When the task is ready to be assigned, its information is passed to the processors for bidding. Each processor has a local scheduler for managing its own activities, which supplies information on its current state and follows whatever decision is given where the fuzzy logic mechanism is used in making decision on the task assignment. A comparative study between the existed fuzzy model and our modified fuzzy model has been done. the comparative results show that our modified fuzzy model outperforms the existed one.

关键词： Dynamic scheduling Fuzzy logic Processor scheduling Computer science distributed computing Iterative methods Load management Concurrent computing NP-complete problem Fuzzy systems

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Design and implementation of parallel JiST to support distributed wireless network simulation

Design and implementation of parallel JiST to support distri...

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international symposium on High Capacity Optical Networks and Enabling Technologies, HONET

作者： Michael Slavik Imad Mahgoub Ahmed Badi Mohammad Ilyas Department of Computer Science and Engineering Florida Atlantic University Boca Raton FL USA

JiST/SWANS is a wireless network simulator gaining increasing popularity for ad-hoc wireless, wireless sensor network, and vehicular network evaluations. Typical published results using this tool show node counts on the order of hundreds of nodes. However, realistic sensor and vehicular networks may contain many more nodes than that. One reason for this discrepancy is the computational cost of evaluation via simulation. Currently, cluster computers are becoming preferred over expensive multi-processor supercomputers for improving computational output. We present the design and implementation of a parallelization of JiST, the discrete event simulator core of JiST/SWANS. JiST uses unique dynamic byte-code rewriting to simplify the development of applications and has been shown to perform well running small- or medium-scale wireless network simulations on single processor systems. We propose an optimistic cluster-based architecture and apply it to JiST. Simulation entity memory is distributed evenly across all nodes in the cluster, resulting in linear memory growth. Details of the simulation engine including the complex event execution synchronization are hidden entirely from the application, easing development and debug time. Since JiST is the simulation backend of the SWANS wireless network simulator, this result is the first step in simulating large networks using SWANS in reasonable periods of time. Results presented show the performance of our parallelization of JiST is in line with the performance of other existing parallel discrete event simulators.

关键词： Synchronization Computational modeling Java Wireless networks Kernel Computer architecture Ad hoc networks

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