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A topology control algorithm for wireless sensor networks that considers overhearing

A topology control algorithm for wireless sensor networks th...

引用

International Symposium on Autonomous Decentralized systems (ISADAS)

作者： Flavio M. Assis Silva Ulisses Telemaco Neto PPGM-Graduate Program on Mechatronics LaSiD-Distributed Systems Laboratory DCC-Department of Computer Science UFBA-Federal University of Bahia Salvador Bahia Brazil

Topology control is one of the main techniques that can be used to decrease energy spenditure in wireless sensor networks. Although it has been the subject of much research, less attention has been devoted to study the effects of overhearing on topology control, i.e., the effects of the cost implied by nodes hearing transmissions even if these transmissions were not intended to them. In this paper we describe a distributed (localized) algorithm for topology control in wireless sensor networks. Our approach differs from previous work mainly in the sense that it takes the effects of overhearing into consideration and that it might eliminate more communication links from a given connectivity graph, and thus possibly assign lower transmission power to some nodes. This is done by eliminating so-called k-redundant edges, instead of eliminating only two redundant edges. We present the sketch of the proof of properties of the algorithm and simulation results.

关键词： Network topology Wireless sensor networks

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A distributed heuristic for decentralized workflow scheduling in global Grids

A distributed heuristic for decentralized workflow schedulin...

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International Workshop on Grid Computing

作者： Mustafizur Rahman Rajiv Ranjan Rajkumar Buyya Grid Computing and Distributed Systems Laboratory Department of Computer Science and Software Engineering University of Melbourne Australia Service Oriented Computing Research Group School of Computer Science and Engineering University of New South Wales Australia

Efficient scheduling is a key concern for the effectual execution of performance driven Grid applications, such as workflows. Many list heuristics have been developed for scheduling workflows in centralized Grid environment. However, in this paper, we present a distributed list heuristic for decentralized scheduling of workflow applications in global Grids. The simulation results show that the proposed scheduling approach is scalable with respect to increased workload on the system.

关键词： Processor scheduling Grid computing Resource management computer science Scheduling algorithm Laboratories Software engineering distributed computing Application software Peer to peer computing

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Dependable workflow scheduling in global Grids

Dependable workflow scheduling in global Grids

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International Workshop on Grid Computing

In this paper, a reputation-based Grid workflow scheduling algorithm is proposed to counter the effect of inherent unreliability and temporal characteristics of computing resources in large scale, decentralized Grid overlays. The proposed approach builds upon structured peer-to-peer indexing and overlay networking techniques to create a scalable wide-area networking of Grid sites for supporting dependable scheduling of applications. The scheduling algorithm considers reliability of a Grid resource as a statistical property, which is globally computed in the decentralized Grid overlay based on dynamic feedbacks or reputation scores assigned by individual service consumers (Grid Resource Brokers). The proposed algorithm can dynamically adapt to changing resource conditions and offer significant performance gains as compared to traditional approaches in the event of unsuccessful job execution or resource failure. We evaluate and demonstrate the feasibility of our approach through an extensive trace driven simulation. The results show that our scheduling technique can reduce the makespan up to 50% and successfully isolate the failure-prone resources from the system.

关键词： Processor scheduling Scheduling algorithm Grid computing Counting circuits Large-scale systems Peer to peer computing Indexing Feedback Heuristic algorithms Performance gain

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Brain Image Registration Analysis Workflow for fMRI Studies on Global Grids

Brain Image Registration Analysis Workflow for fMRI Studies ...

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International Conference on Advanced Information Networking and Applications (AINA)

作者： Suraj Pandey William Voorsluys Musta?zur Rahman Rajkumar Buyya James Dobson Kenneth Chiu Grid Computing and Distributed Systems (GRIDS) Laboratory Department of Computer Science and Software Engineering University of Melbourne Australia Department of Psychological & Brain Sciences Dartmouth College USA Grid Computing Research Laboratory Department of Computer Science State University of New York Binghamton NY USA

Scientific applications like neuroscience data analysis are usually compute and data-intensive. With the use of globally distributed resources and suitable middlewares, we can achieve much shorter execution time, distribute compute and storage load, and add greater flexibility to the execution of these scientific applications than we could ever achieve in a single compute *** this paper, we present the processing of image registration (IR) for functional magnetic resonance imaging(fMRI) studies on global grids. We characterize the application, list its requirements and transform it to a workflow. We then execute the application on Gridpsila5000 platform and present extensive performance results. We show that the IR application can have 1) significantly improved makespan, 2) distribution of compute and storage load among resources used, and 3) flexibility when executing multiple times on global Grids.

关键词： Brain Image registration Image analysis distributed computing Grid computing Optical computing Image storage Neuroscience Data analysis Middleware

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P systems and context-free 2D picture languages

P systems and context-free 2D picture languages

引用

International Conference on Bio-Inspired Computing: Theories and Applications, BICTA

作者： K.G. Subramanian Linqiang Pan See Keong Lee Atulya K. Nagar School of Mathematical Sciences Universiti Sains Islam Malaysia Penang Malaysia Huazhong University of Science and Technology China Intelligent and Distributed Systems Laboratory Department of Computer Science Liverpool Hope University UK

In membrane computing, P system has proved to be a rich framework for handling a variety of problems arising in different areas. In this note we examine an array-rewriting P system for rectangular picture array generation. This system makes use of Pure 2D context-free grammar rules in its regions. We obtain certain comparison results that bring out the suitability of this P system model in increasing the generative power of picture generation.

关键词： Power generation Biomembranes Power system modeling distributed computing Biology computing Biological system modeling Concurrent computing Phased arrays Intelligent systems Laboratories

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Array P System Model with Pure Context-Free Rules

Array P System Model with Pure Context-Free Rules

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International Conference on computer Modeling and Simulation, UKSIM

作者： K.G. Subramanian M. Geethalakshmi Atulya K. Nagar S.K. Lee School of Mathematical Sciences Universiti Sains Malaysia Penang Malaysia Department of Mathematics Dr. MGR Janaki College Chennai India Intelligent and Distributed Systems Laboratory Department of Computer Science Liverpool Hope University Liverpool UK Intelligent and Distributed Systems Laboratory Department of Computer Science Liverpool Hope University Hope Park Liverpool UK School of Mathematical Sciences Universiti Sains Islam Malaysia Penang Malaysia

Motivated by the structure and functioning of the living cell, a new computing model, called P system, was proposed in the area of membrane computing. Among several areas of application of P systems, one area is concerned with generation of picture array languages. Ceterchi et al. initially proposed array-rewriting P systems by extending the notion of string-rewriting P-systems. On the other hand a new theoretical model of grammatical picture generation called pure 2D context-free picture grammar (P2DCFPG) generating rectangular picture arrays of symbols has been introduced by Subramanian et al.. Here we consider P2DCFPG type of rules in array-rewriting P systems and examine the generating power of the resulting array P systems.

关键词： Context modeling Biomembranes Power system modeling Power generation Concurrent computing distributed computing Computational modeling computer simulation Intelligent systems Laboratories

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A Heuristic for Mapping Virtual Machines and Links in Emulation Testbeds

A Heuristic for Mapping Virtual Machines and Links in Emulat...

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International Conference on parallel Processing (ICPP)

作者： Rodrigo N. Calheiros Rajkumar Buyya César A.F. De Rose Pontifical Catholic University of Rio Grande do Sul Porto Alegre Brazil Grid Computing and Distributed Systems (GRIDS) Laboratory Department of Computer Science and Software Engineering University of Melbourne Australia

distributed system emulators provide a paramount platform for testing of network protocols and distributed applications in clusters and networks of workstations. However, to allow testers to benefit from these systems, it is necessary an efficient and automatic mapping of hundreds, or even thousands, of virtual nodes to physical hosts-and the mapping of the virtual links between guests to physical paths in the physical environment. In this paper we present a heuristic to map both virtual machines to hosts and virtual links between virtual machines to paths in the real system. We define the problem we are addressing, present the solution for it and evaluate it in different usage scenarios.

关键词： Virtual machining System testing Switches Grid computing Network topology Cloud computing Software testing LAN emulation Wide area networks parallel processing

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DeCoMAS: An Architecture for Supplementing MAS with Systemic Models of Decentralized Agent Coordination

DeCoMAS: An Architecture for Supplementing MAS with Systemic...

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IEEE WIC ACM International Conference on Web Intelligence (WI)

作者： Jan Sudeikat Wolfgang Renz Distributed Systems and Information Systems (VSIS) Group Department of Informatics Faculty of Mathematics Informatics and Natural Sciences University of Hamburg Hamburg Germany Multimedia Systems Laboratory (MMLab) Faculty of Engineering and Computer Science Hamburg University of Applied Sciences Hamburg Germany

The systematic conception of decentralized and self-adaptive software systems, as demanded for the run-time management of today’s distributed, multi-tier software architectures, is an active research area. Here, we discuss a coordination architecture that facilitates the enactment of externalized coordination models in Multi-agent systems (MAS). Coordination is configured by systemic models, i.e. structures of agent-behaviour interdependencies that denote the mutual influences of agent activities. The systematic, iterative application development is supported by a non-intrusive integration approach that enables developers to adjust application dynamics by complementing agent-based applications with systemic coordination models.

关键词： Application software Intelligent agent Software systems Feedback loop computer architecture Multiagent systems Software engineering Informatics Collaborative software Conferences

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Modeling and simulation of scalable Cloud computing environments and the CloudSim toolkit: Challenges and opportunities

Modeling and simulation of scalable Cloud computing environm...

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International Conference on High Performance Computing & Simulation (HPCS)

作者： Rajkumar Buyya Rajiv Ranjan Rodrigo N. Calheiros Grid Computing and Distributed Systems (GRIDS) Laboratory Department of Computer Science and Software Engineering University of Melbourne Australia Department of Computer Science and Engineering University of New South Wales Sydney Australia Pontifical Catholic University of Rio Grande do Sul Porto Alegre Brazil

Cloud computing aims to power the next generation data centers and enables application service providers to lease data center capabilities for deploying applications depending on user QoS (Quality of Service) requirements. Cloud applications have different composition, configuration, and deployment requirements. Quantifying the performance of resource allocation policies and application scheduling algorithms at finer details in Cloud computing environments for different application and service models under varying load, energy performance (power consumption, heat dissipation), and system size is a challenging problem to tackle. To simplify this process, in this paper we propose CloudSim: an extensible simulation toolkit that enables modelling and simulation of Cloud computing environments. The CloudSim toolkit supports modelling and creation of one or more virtual machines (VMs) on a simulated node of a Data Center, jobs, and their mapping to suitable VMs. It also allows simulation of multiple Data Centers to enable a study on federation and associated policies for migration of VMs for reliability and automatic scaling of applications.

关键词： Computational modeling Cloud computing Power system modeling Voice mail Quality of service Resource management Scheduling algorithm Load modeling Energy consumption Virtual machining

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Tile Pasting P System Model for Pattern Generation

Tile Pasting P System Model for Pattern Generation

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Asia International Conference on Modeling & Simulation

作者： K.G. Subramanian T. Robinson Atulya K. Nagar School of Mathematical Sciences Universiti Sains Islam Malaysia Penang Malaysia Department of Mathematics Madras Christian College Chennai India Intelligent and Distributed Systems Laboratory Department of Computer Science Liverpool Hope University Liverpool UK

ISBN: (纸本)9781424441549

In the area of membrane computing, a new computability model, called P system, which is a distributed, highly parallel theoretical computing model, was introduced by Paun, inspired from the cell structure and its functioning. There are several application areas of these P systems. Among these one area deals with the problem of picture array generation. Ceterchi et al. began a study on linking the two areas of membrane computing and picture grammars, which were not very much linked before, by relating P systems and array-rewriting grammars generating picture languages and proposing array-rewriting P systems. In this paper we propose a theoretical model of a P system, called Tile pasting P system, for generating two-dimensional patterns that are formed by gluing square tiles and study some of its properties.

关键词： Tiles Concurrent computing distributed computing Biomembranes Power system modeling Mathematical model Joining processes Arm Asia Computational modeling

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