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IEEE International Conference on Networks

作者： Mukaddim Pathan Rajkumar Buyya Grid Computing and Distributed Systems (GRIDS) Laboratory Department of Computer Science and Software Engineering University of Melbourne Parkville VIC Australia

A content delivery network (CDN) is expected to provide high performance content delivery, which requires scalable infrastructure to achieve global coverage. The provision of such infrastructure may form a substantial entry barrier for new CDN providers, as well as affecting commercial viability of the existing ones. Peering of CDNs can be a way to allow dynamic infrastructural cooperation between CDNs in a scalable manner, in order to mitigate the impact of flash crowds and to achieve better overall service times. In this paper, we present a quality of service (QoS)-driven model to evaluate the user perceived performance of CDN peering relationships. In this model, an overloaded CDN redirects a fraction of its incoming requests to peered CDNs and thereby can avoid the impact of flash crowds. The model-based approach also assists in making concrete QoS guarantee for a given CDN. Our approach endeavors to achieve scalability for a CDN in a user transparent manner.

关键词： Quality of service Web server Costs Delay Analytical models Grid computing Laboratories computer science Software engineering Concrete

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A Context Query Language for Pervasive Computing Environments

A Context Query Language for Pervasive Computing Environment...

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IEEE International Conference on Pervasive Computing and Communications (PerCom)

作者： Roland Reichle Michael Wagner Mohammad Ullah Khan Kurt Geihs Massimo Valla Cristina Fra Nearchos Paspallis George A. Papadopoulos Distributed Systems Group University of Kassel Germany Telecom Italia Laboratory Italy Department of Computer Science University of Cyprus Cyprus

This paper identifies requirements for querying and accessing context information in mobile and pervasive computing environments. Furthermore it studies existing query languages showing that they satisfy only a subset of these requirements or cover some of them only to a limited extent. A new context query language is presented to overcome these shortcomings, improving the state of the art in several respects: heterogeneous representations of context information, definition of complex filtering mechanisms, elaborate aggregation functions and ontology integration, all in one language.

关键词： Database languages Pervasive computing Mobile computing Information filtering Information filters Ontologies Information retrieval Subscriptions Context Telecommunications

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A Lyapunov-Based Extension to PSO Dynamics for Continuous Function Optimization

A Lyapunov-Based Extension to PSO Dynamics for Continuous Fu...

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computer Modeling and Simulation, EMS, UKSIM European Symposium on FLAGGED

作者： Sayantani Bhattacharya Amit Konar Atulya Nagar Artificial Intelligence Laboratory ETCE Department Jadavpur University Kolkata India Intelligence and Distributed Systems Laboratory Deanery of Business & Computer Science Liverpool Hope University Liverpool UK

The paper proposes three alternative extensions to the classical global-best particle swarm optimization dynamics, and compares their relative performance with the classical particle swarm optimization algorithm. The first extension, which readily follows from the well-known Lyapunov's stability theorem, provides a mathematical basis of the particle dynamics with a guaranteed convergence at an optimum. The inclusion of local and global attractors to this dynamics leads to faster convergence speed and better accuracy than the classical one. The second extension augments the velocity adaptation equation by a negative randomly weighted positional term of individual particle, while the third extension considers the negative positional term in place of the inertial term. computer simulations further reveal that the last two extensions outperform both the classical and the first extension in convergence speed and accuracy.

关键词： Heuristic algorithms Benchmark testing Convergence Dynamics Accuracy Asymptotic stability Equations

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Advanced QoS methods for Grid workflows based on meta-negotiations and SLA-mappings

Advanced QoS methods for Grid workflows based on meta-negoti...

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Workshop on Workflows in Support of Large-Scale science, WORKS

作者： Ivona Brandic Dejan Music Schahram Dustdar Srikumar Venugopal Rajkumar Buyya Institute of Information Systems University of Technology Vienna Austria Grid Computing and Distributed System (GRIDS) Laboratory Department of Computer Science and Software Engineering University of Melbourne Australia

In novel market-oriented resource sharing models, resource consumers pay for the resource usage and expect that non-functional requirements for the application execution, termed as quality of service (QoS), are satisfied. QoS is negotiated between two parties following the specific negotiation protocols and is recorded using service level agreements (SLAs). However, most of the existing work assumes that the communication partners know about the SLA negotiation protocols and about the SLA templates before entering the negotiation. However, this is a contradictory assumption, if we consider computational grids and novel, commercially oriented computing clouds where consumers and providers meet each other dynamically. In this paper, we present novel meta-negotiation and SLA-mapping solutions for grid workflows bridging the gap between current QoS models and grid workflows, one of the most successful grid programming paradigms. We illustrate the open research issues with a real world case study. Thereafter, we present document models for the specification of meta-negotiations and SLA-mappings. We discuss the architecture for the management of meta-negotiations and SLA-mappings as well as integration of the architecture into a grid workflow management framework.

关键词： Quality of service Protocols Grid computing Cloud computing Resource management Information systems Laboratories computer science Software engineering Application software

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Jeeva: Enterprise Grid Enabled Web Portal for Protein Secondary Structure Prediction

Jeeva: Enterprise Grid Enabled Web Portal for Protein Second...

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International Conference on Advanced Computing and Communications (ADCOM)

作者： Chao Jin Jayavardhana Gubbi Rajkumar Buyya Marimuthu Palaniswami Grid Computing and Distributed Systems (GRIDS) Laboratory Department of Computer Science and Software Engineering University of Melbourne Melbourne VIC Australia Department of Electrical and Electronic Engineering University of Melbourne Melbourne VIC Australia

This paper presents a grid portal for protein secondary structure prediction developed by using services of Aneka, a .NET-based enterprise grid technology. The portal is used by research scientists to discover new prediction structures in a parallel manner. An SVM (support vector machine)-based prediction algorithm is used with 64 sample protein sequences as a case study to demonstrate the potential of enterprise grids.

关键词： Portals Protein engineering Grid computing Prediction algorithms Support vector machines distributed computing Environmental management Chaos computer science History

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Collaborative search in large-scale unstructured peer-to-peer networks

Collaborative search in large-scale unstructured peer-to-pee...

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36th International Conference on parallel Processing in Xi'an, ICPP

作者： Zhang, Yiming Li, Dongsheng Chen, Lei Lu, Xicheng National Laboratory for Parallel and Distributed Processing NUDT Department of Computer Science Hong Kong University of Science and Technology

ISBN: (纸本)076952933X

Searching in large-scale unstructured peer-to-peer networks is challenging due to the lack of effective hint information to guide queries. In this paper, we propose POP, a parallel, cOllaborative and Probabilistic search mechanism, in which query messages are viewed as search units to collaborate with each other and aggregate the distributed hints during the search process. A scheme called distributed Bloom Filter (DBF) is presented to propagate the hints with a bandwidth-aware manner, in which a node divides the received Bloom filter vector into subvectors and disseminates the fragments to its neighbors according to their bandwidth capacity. The effectiveness of POP is demonstrated through theoretical analysis and extensive simulations. © 2007 IEEE.

关键词： Bandwidth

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Light-weight erid-to-end QoS as DoS prevention

Light-weight erid-to-end QoS as DoS prevention

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32nd IEEE Conference on Local computer Networks, LCN 2007

作者： Waldvogel, Marcel Köck, Tobias Distributed Systems Laboratory Department of Computer and Information Science University of Konstanz 78457 Konstanz Germany

ISBN: (纸本)0769530001

This paper proposes a first step into a common solution, where combined and extended interests will hopefully allow us to surpass this threshold. While there are still some open issues, we hope to not only propose a basic working mechanism but also provide fresh ideas to start thinking off the beaten path. Our main contribution is to create a lightweight, end-to-end binding between path and service, which is then used as a basis to associate further attributes and mechanisms to this binding. © 2007 IEEE.

关键词： Quality of service

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Integrated risk analysis for a commercial computing service

Integrated risk analysis for a commercial computing service

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21st International parallel and distributed Processing Symposium, IPDPS 2007

作者： Yeo, Chee Shin Buyya, Rajkumar Grid Computing and Distributed Systems Laboratory Department of Computer Science and Software Engineering University of Melbourne Vic. 3010 Australia

ISBN: (纸本)1424409101

Utility computing has been anticipated to be the next generation of computing usage. Users have the freedom to easily switch to any commercial computing service to complete jobs whenever the need arises and simply pay only on usage, without any investment costs. A commercial computing service however has certain objectives or goals that it aims to achieve. In this paper, we identify three essential objectives for a commercial computing service: (i) meet SLA, (ii) maintain reliability, and (iii) earn profit. This leads to the problem of whether a resource management policy implemented in the commercial computing service is able to meet the required objectives or not. So, we also develop two evaluation methods that are simple and intuitive: (i) separate and (ii) integrated risk analysis to analyze the effectiveness of resource management policies in achieving the required objectives. Evaluation results based on five policies successfully demonstrate the applicability of separate and integrated risk analysis to assess policies in terms of the required objectives. © 2007 IEEE.

关键词： Utility programs

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A grid based e-Research platform for clinical management in the human respiratory and vascular system

Conferences in Research and Practice in Information Technolo...

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Conferences in Research and Practice in Information Technology Series 2007年 68卷 11-17页

作者： Cheung, Sherman Chu, Xingchen Xu, Shengjin Buyya, Rajkumar Tu, Jiyuan School of Aerospace Mechanical and Manufacturing Engineering RMIT University VIC 3083 Australia Grid Computing and Distributed Systems Laboratory Department of Computer Science and Software Engineering The University of Melbourne VIC 3010 Australia

ISBN: (纸本)192068249X

A Grid based e-Research platform is being developed for providing a simulation-based virtual reality environment for clinical management and therapy treatment. The development of this platform involves cross-disciplinary experts aiming at combining the state-of-the-art Computational Fluid Dynamics (CFD) analysis tools into clinical management system. These fluid dynamic studies support the physician and surgeon with recommendations for the possible range of treatment and operation techniques. The platform will consist of a cluster of computing nodes, a middleware (Grid management layer), internet accessible tomography data and CFD analysis tools, and a tailored graphical user interface (GUI) application for various experts. In future, this platform will provide the novel creation of a prototype virtual reality model environment that links each technical modular consisting of a consolidation system with flexible interface model for exchanging data efficiently. Furthermore, besides allowing expeditious sharing of data and analytical tools, it will also furnish a foundation for cross-disciplinary collaboration and will definitely foster further advancement of related biomechanics researches. © 2007, Australian computer Society, Inc.

关键词： Grid computing

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A SLA-oriented management of containers for hosting stateful web services

A SLA-oriented management of containers for hosting stateful...

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3rd IEEE International Conference on e-science and Grid Computing

作者： Reich, Christoph Bubendorfer, Kris Banholzer, Matthias Buyya, Rajkumar Department of Computer Science Hochschule Furtwangen University Germany School of Mathematics Statistics and Computer Science Victoria University of Wellington New Zealand Grid Computing and Distributed Systems (GRIDS) Laboratory Department of Computer Science and Software Engineering University of Melbourne Australia

ISBN: (纸本)9780769530642

Service-Oriented Architectures provide integration of interoperability for independent and loosely coupled services. Web services and the associated new standards such as WSRF are frequently used to realise such Service-Oriented Architectures. In such systems, autonomic principles of self-configuration, self-optimisation, self-healing and self-adapting are desirable to ease management and improve robustness. In this paper we focus on the extension of the self management and autonomic behaviour of a WSRF container connected by a structured P2P overlay network to monitor and rectify its QoS to satisfy its SLAs. The SLA plays an important role during two distinct phases in the life-cycle of a WSRF container Firstly during service deployment when services are assigned to containers in such a way as to minimise the threat of SLA violations, and secondly during maintenance when violations are detected and services are migrated to other containers to preserve QoS. In addition, as the architecture has been designed and built using standardised modem technologies and with high levels of transparency, conventional web services can be deployed with the addition of a SLA specification.

关键词： Containers

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