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International Conference on Advanced Computing and Communications (ADCOM)

作者： Thamarai Selvi Somasundaram R.A. Balachandar Vijayakumar Kandasamy Rajkumar Buyya Rajagopalan Raman N. Mohanram S. Varun Department of Information Technology Anna University Chennai India Grid Computing and Distributed Systems Laboratory Department of Computer Science and Software Engineering University of Melbourne VIC Australia Centre for Development of Advanced Computing Chennai India Centre for Development of Advanced Computing Bangalore India

This paper addresses the need of semantic component in the grid environment to discover and describe the grid resources semantically. We propose semantic grid architecture by introducing a knowledge layer at the top of Gridbus broker architecture and thereby enabling broker to discover resources semantically. The semantic component in the knowledge layer enables semantic description of grid resources with the help of ontology template. The ontology template has been created using Protege-OWL editor for different types of computing resources in the grid environment. The Globus Toolkit's MDS is used to gather grid resource information and Protege-OWL libraries are used to dynamically create knowledge base of grid resources. Algernon inference engine is used for interacting with the knowledge base to discover suitable resources.

关键词： Distributed computing Ontologies Middleware computer architecture computer networks Grid computing Libraries Engines Monitoring Aggregates

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Combining Probabilistic Ranking and Latent Semantic Indexing for Feature Identification

Combining Probabilistic Ranking and Latent Semantic Indexing...

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IEEE Workshop on Program Comprehension

作者： D. Poshyvanyk A. Marcus V. Rajlich Y.-G. Gueheneuc G. Antoniol Department of Computer Science Wayne State University Detroit MI USA GEODES-Research Group on Open Distributed Systems Experimental Software Engineering University of Montreal Canada Department of Mathematics and Computer Science Babeş-Bolyai University Cluj-Napoca Romania Département de Génie Informatique École Polytechnique de Montréal Canada

The paper recasts the problem of feature location in source code as a decision-making problem in the presence of uncertainty. The main contribution consists in the combination of two existing techniques for feature location in source code. Both techniques provide a set of ranked facts from the software, as result to the feature identification problem. One of the techniques is based on a scenario based probabilistic ranking of events observed while executing a program under given scenarios. The other technique is defined as an information retrieval task, based on the latent semantic indexing of the source code. We show the viability and effectiveness of the combined technique with two case studies. A first case study is a replication of feature identification in Mozilla, which allows us to directly compare the results with previously published data. The other case study is a bug location problem in Mozilla. The results show that the combined technique improves feature identification significantly with respect to each technique used independently

关键词： Indexing computer science software engineering Information retrieval Information analysis Data mining Decision making Uncertainty software debugging software systems

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Enabling Self-Managing Applications using Model-based Online Control Strategies

Enabling Self-Managing Applications using Model-based Online...

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International Conference on Autonomic Computing (ICAC)

作者： V. Bhat M. Parashar Hua Liu M. Khandekar N. Kandasamy S. Abdelwahed TASSL Rutgers University Piscataway NJ USA TASSL Rutgers University Piscataway NJ Xerox Innovation Group Webster NY USA Electrical and Computer Engineering Department Drexel University Philadelphia PA USA Institute for Software Integrated Systems Nashville TN USA

The increasing heterogeneity, dynamism and uncertainty of emerging DCE (Distributed Computing Environment) systems imply that an application must be able to detect and adapt to changes in its state, its requirements and the state of the system to meet its desired QoS constraints. As system and application scales increase, ad hoc heuristic-based approaches to application adaptation and self-management quickly become insufficient. This paper builds on the Accord programming system for rule-based self-management and extends it with model-based control and optimization strategies. This paper also presents the development of a self-managing data streaming service based on online control using Accord. This service is part of a Grid-based fusion simulation workflow consisting of long-running simulations, executing on remote supercomputing sites and generating several terabytes of data, which must then be streamed over a wide-area network for live analysis and visualization. The self-managing data streaming service minimize data streaming overheads on the simulations, adapt to dynamic network bandwidth and prevent data loss. An evaluation of the service demonstrating its feasibility is presented.

关键词： Application software Quality of service Distributed computing Uncertainty Analytical models Mesh generation Grid computing Runtime Technological innovation Electronic mail

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Aligning software processes with strategy

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MIS Quarterly: Management Information systems 2006年第4期30卷 891-918页

作者： Slaughter, Sandra A. Levine, Linda Ramesh, Balasubramaniam Pries-Heje, Jan Baskerville, Richard David A. Tepper School of Business Carnegie Mellon University Tech and Frew Streets Pittsburgh PA 15213 United States Software Engineering Institute Carnegie Mellon University Pittsburgh PA 15213 United States Computer Information Systems Department Georgia State University Atlanta GA 30303 United States IT University of Copenhagen Rued Langgaards Vej 7 DK-2300 Copenhagen S Denmark

Although increasing evidence suggests that superior performance requires alignment between firms' strategies and production processes, it is not known if such alignment is relevant for software development processes. This study breaks new ground by examining how firms align their software processes, products, and strategies in Internet application development. Drawing upon the literatures in strategy, operations management, and information systems, we identify four dimensions that influence alignment: the business unit strategy, the level of product customization, the level of process customization, and the volume of customers. To examine how these dimensions are synchronized, we conducted detailed case studies of Internet application development in nine varied firms including both start-ups and established "brick and mortar" companies. Our analyses reveal that the firms in our study do use differing processes for Internet application development, and that many of the firms match their software process choices to product characteristics, customer volume, and business unit strategies. We develop concept maps for the firms that are in alignment to illustrate how managers configure specific product and process dimensions. We also offer potential explanations for why some firms are misaligned, such as attempting to execute incompatible strategies, the lack of coordination between marketing and production strategies, the too rapid expansion of process scope, and inflexible barriers to rapid adaptation of process. Our study contributes detailed insights into how software processes are customized to complement different types of product requirements and strategies.

关键词： software engineering

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Methodological contributions to the construction of virtual environments on the Internet

Methodological contributions to the construction of virtual ...

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1st International Conference on Internet Technologies and Applications, ITA 05

作者： Castán, Héctor Sanjuán, Oscar Aguilar, Luís Joyanes Segovia, Javier Department of Languages and Systems and Software Engineering Pontifical University of Salamanca Madrid Campus Spain Department of Languages and Systems and Software Engineering Polytechnic University of Madrid Spain

ISBN: (纸本)0946881324

Virtual reality systems should provide a satisfactory immersive experience for the user. However, the time needed to fully download and display them in the user platform, and long-time delays to start an interaction, may negatively influence the users perception of the overall quality. In order to obtain high quality networked virtual environments in the Internet, as it happens with other software development projects, including a "quality phase" seems not to be enough. This paper proposes a series of development guidelines for virtual environments with the aim of both making the development process easier and improving the final system.

关键词： software design

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Evaluating the usability of Internet networked virtual environments

Evaluating the usability of Internet networked virtual envir...

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1st International Conference on Internet Technologies and Applications, ITA 05

作者： Castán, Hector Sánchez-Alonso, Salvador Department of Languages and Systems and Software Engineering Pontifical University of Salamanca Madrid Campus Spain Computer Science Department University of Alcala Madrid Spain

ISBN: (纸本)0946881324

Internet networked virtual environments, such as VRML-based environments, should provide a satisfactory immersive experience to users. However, the time needed to download them and display them in the user platform, as well as the time delays in effectively starting an interaction, may adversely influence the overall user satisfaction. This article shows the results of a series of usability tests oriented towards improving Internet networked virtual environments construction by analysing the influence of time delays and other problems in the users' perception of virtual environments.

关键词： Time delay

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Self-stabilizing deterministic TDMA for sensor networks

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2nd International Conference on Distributed Computing and Internet Technology, ICDCIT 2005

作者： Arumugam, Mahesh Kulkarni, Sandeep S. Software Engineering and Network Systems Laboratory Department of Computer Science and Engineering Michigan State University East Lansing MI 48824

ISBN: (纸本)3540309993

An algorithm for time division multiple access (TDMA) is found to be applicable in converting existing distributed algorithms into a model that is consistent with sensor networks. Such a TDMA service needs to be self-stabilizing so that in the event of corruption of assigned slots and clock drift, it recovers to states from where TDMA slots are consistent. Previous self-stabilizing solutions for TDMA are either randomized or assume that the topology is known upfront and cannot change. Thus, the question of feasibility of self-stabilizing deterministic TDMA algorithm where topology is unknown remains open. In this paper, we present a self-stabilizing, deterministic algorithm for TDMA in networks where a sensor is aware of only its neighbors. This is the first such algorithm that achieves these properties. Moreover, this is the first algorithm that demonstrates the feasibility of stabilization-preserving, deterministic transformation of a shared memory distributed program on an arbitrary topology into a program that is consistent with the sensor network model. © Springer-Verlag Berlin Heidelberg 2005.

关键词： computer networks

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A taxonomy of workflow management systems for Grid computing

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Journal of Grid Computing 2005年第3-4期3卷 171-200页

作者： Yu, Jia Buyya, Rajkumar Grid Computing and Distributed Systems (GRIDS) Laboratory Department of Computer Science and Software Engineering The University of Melbourne Melbourne Vic. Australia

With the advent of Grid and application technologies, scientists and engineers are building more and more complex applications to manage and process large data sets, and execute scientific experiments on distributed resources. Such application scenarios require means for composing and executing complex workflows. Therefore, many efforts have been made towards the development of workflow management systems for Grid computing. In this paper, we propose a taxonomy that characterizes and classifies various approaches for building and executing workflows on Grids. We also survey several representative Grid workflow systems developed by various projects world-wide to demonstrate the comprehensiveness of the taxonomy. The taxonomy not only highlights the design and engineering similarities and differences of state-of-the-art in Grid workflow systems, but also identifies the areas that need further research. © Springer Science+Business Media, Inc. 2006.

关键词： Grid computing Resource management Scheduling Taxonomy Workflow management

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Cooperative defense against network attacks

Cooperative defense against network attacks

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作者： Zhang, Guangsen Parashar, Manish Applied Software Systems Laboratory Department of Electrical and Computer Engineering Rutgers University United States

ISBN: (纸本)9728865252

Distributed denial of service (DDoS) attacks on the Internet have become an immediate problem. As DDoS streams do not have common characteristics, currently available intrusion detection systems (IDS) can not detect them accurately. As a result, defend DDoS attacks based on current available IDS will dramatically affect legitimate traffic. In this paper, we propose a distributed approach to defend against distributed denial of service attacks by coordinating across the Internet. Unlike traditional IDS, we detect and stop DDoS attacks within the intermediate network. In the proposed approach, DDoS defense systems are deployed in the network to detect DDoS attacks independently. A gossip based communication mechanism is used to exchange information about network attacks between these independent detection nodes to aggregate information about the overall network attacks observed. Using the aggregated information, the individual defense nodes have approximate information about global network attacks and can stop them more effectively and accurately. To provide reliable, rapid and widespread dissemination of attack information, the system is built as a peer to peer overlay network on top of the internet.

关键词： Denial-of-service attack

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The grid economy

The grid economy

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作者： Buyya, Rajkumar Abramson, David Venugopal, Srikumar Grid Computing and Distributed Systems Laboratory Department of Computer Science and Software Engineering University of Melbourne Vic. 3010 Australia School of Computer Science and Software Engineering Monash University Vic. 3163 Australia

This paper identifies challenges in managing resources in a Grid computing environment and proposes computational economy as a metaphor for effective management of resources and application scheduling. It identifies distributed resource management challenges and requirements of economy-based Grid systems, and discusses various representative economy-based systems, both historical and emerging, for cooperative and competitive trading of resources such as CPU cycles, storage, and network bandwidth. It presents an extensible, service-oriented Grid architecture driven by Grid economy and an approach for its realization by leveraging various existing Grid technologies. It also presents commodity and auction models for resource allocation. The use of commodity economy model for resource management and application scheduling in both computational and data grids is also presented. © 2005 IEEE.

关键词： Computational methods

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