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International Conference on Advanced Information Networking and Applications (AINA)

作者： William Voorsluys Rajkumar Buyya Cloud Computing and Distributed Systems (CLOUDS) Laboratory Department of Computer Science and Software Engineering University of Melbourne Australia

Cloud computing providers are now offering their unused resources for leasing in the spot market, which has been considered the first step towards a full-fledged market economy for computational resources. Spot instances are virtual machines (VMs) available at lower prices than their standard on-demand counterparts. These VMs will run for as long as the current price is lower than the maximum bid price users are willing to pay per hour. Spot instances have been increasingly used for executing compute-intensive applications. In spite of an apparent economical advantage, due to an intermittent nature of biddable resources, application execution times may be prolonged or they may not finish at all. This paper proposes a resource allocation strategy that addresses the problem of running compute-intensive jobs on a pool of intermittent virtual machines, while also aiming to run applications in a fast and economical way. To mitigate potential unavailability periods, a multifaceted fault-aware resource provisioning policy is proposed. Our solution employs price and runtime estimation mechanisms, as well as three fault-tolerance techniques, namely check pointing, task duplication and migration. We evaluate our strategies using trace-driven simulations, which take as input real price variation traces, as well as an application trace from the Parallel Workload Archive. Our results demonstrate the effectiveness of executing applications on spot instances, respecting QoS constraints, despite occasional failures.

关键词： Fault tolerance Fault tolerant systems Checkpointing Runtime Virtual machining Computational modeling

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An Implementation of Embedded Real Time System Framework in Service Oriented Architecture

An Implementation of Embedded Real Time System Framework in ...

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International Conference on Cyber-Enabled Distributed Computing and Knowledge Discovery, CyberC

作者： Mahmood Aghajani Dayang N.A. Jawawi Department of Software Engineering Faculty of Computer Science and Information Systems Universiti Teknologi Malaysia Johor Bahru Malaysia

Currently, the complexity of embedded software is increased, hence, more efficient design approaches are demanded. Although component based design is well-defined for developing Embedded Real Time (ERT) systems, the design and implementation of ERT component software is slow and complex. Distributed ERT systems can reduce the complexity of a component and increase its reliability and re-usability as well. Currently, Service Oriented Architecture (SOA) is an excellent technology for the implementation of distributed software. Some platforms are introduced to implement the components in SOA concept such as Service Component Architecture (SCA) and OSGI (Open Services Gateway Initiative). SCA provides a hierarchical component composition, distributed configurations and an interconnection with various means to design and combine services. However, SCA is unable to discover and reference services dynamically. In contrast, OSGI focuses on loading the service component. The services can be stopped, loaded and unloaded in frameworks supported by OSGI. Hence, this paper proposes an integration of SCA and OSGI to introduce a new framework for the implementation of distributed ERT systems.

关键词： Service oriented architecture Real-time systems computer architecture Business Semiconductor optical amplifiers

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Preemption-aware Admission Control in a Virtualized Grid Federation

Preemption-aware Admission Control in a Virtualized Grid Fed...

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International Conference on Advanced Information Networking and Applications (AINA)

作者： Mohsen Amini Salehi Bahman Javadi Rajkumar Buyya Cloud Computing and Distributed Systems (CLOUDS) Laboratory Department of Computer Science and Software Engineering University of Melbourne Australia

Many applications in federated Grids have quality-of-service (QoS) constraints such as deadline. Admission control mechanisms assure QoS constraints of the applications by limiting the number of user requests accepted by a resource provider. However, in order to maximize their profit, resource owners are interested in accepting as many requests as possible. In these circumstances, the question that arises is: what is the effective number of requests that can be accepted by a resource provider in a way that the number of accepted external requests is maximized and, at the same time, QoS violations are minimized. In this paper, we answer this question in the context of a virtualized federated Grid environment, where each Grid serves requests from external users along with its local users and requests of local users have preemptive priority over external requests. We apply analytical queuing model to address this question. Additionally, we derive a preemption-aware admission control policy based on the proposed model. Simulation results under realistic working conditions indicate that the proposed policy improves the number of completed external requests (up to 25%). In terms of QoS violations, the 95% confidence interval of the average difference with other policies is between (14.79%, 18.56%).

关键词： Admission control Mathematical model Equations Analytical models Time factors Queueing analysis

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A systematic map of integration of aspect orientation and model-driven engineering

A systematic map of integration of aspect orientation and mo...

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International Conference on Open Source systems and Technologies (ICOSST)

作者： Abid Mehmood Dayang N.A. Jawawi Department of Software Engineering Faculty of Computer Science and Information Systems Universiti Teknologi Malaysia Skudai Johor Malaysia

An integration of aspect orientation and model-driven engineering is expected to enhance software development from many perspectives. Different approaches for this integration have already appeared in literature. In general, all such approaches use aspect-oriented model as the primary artifact and apply different techniques to obtain an executable from it. In this study we have provided a survey of existing research in this context by conducting a systematic mapping study. Classification schemes were defined and 38 selected primary studies were classified on the basis of research focus, contribution type and research type. Results show that solutions proposals are in a majority and current research has mainly focused on using model weavers for the integration (81% versus 19% code generation approaches). The majority of contributions are methods.

关键词： Unified modeling language Weaving Computational modeling Proposals Object oriented modeling Systematics software

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Malay anaphor and antecedent candidate identification: A proposed solution

Malay anaphor and antecedent candidate identification: A pro...

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4th Asian Conference on Intelligent Information and Database systems, ACIIDS 2012

作者： Mohd Noor, Noorhuzaimi Karimah Noah, Shahrul Azman Ab Aziz, Mohd Juzaiddin Hamzah, Mohd Pouzi Faculty of Computer Systems and Software Engineering Universiti Malaysia Pahang Lebuhraya Tun Razak Pahang Kuantan 26300 Malaysia Knowledge Technology Research Group Faculty of Technology and Information Science Universiti Kebangsaan Malaysia Selangor Bangi 43600 Malaysia Department of Computer Science Faculty of Science Technology Universiti Malaysia Terengganu Terengganu Kuala Terengganu 21030 Malaysia

ISBN: (纸本)9783642284922

This paper discusses on Malay language anaphor and antecedent candidate determination using the knowledge-poor techniques. The process to determine the candidate for anaphor and antecedent is important because the usage of pronouns in a text is not always considered as an anaphor. Sometimes pronoun referred to something outside the context or does not refer to any situation in the text. Such a situation is also exhibited in the use of pronouns in Malay language. Therefore, certain rules must be issued to identify the antecedent and anaphor candidate. Pronoun usage in Malay language does indicate the gender of the person, but to distinguish the status of the person such as imperial family, honorable people and common people. Thus, generic rules that have been used by other languages cannot simply be adapted for Malay language. The proposed solution concerns with the distance of each candidate and location of the Subject-Verb-Object (SVO) used to determine the anaphor candidate. As such, syntactic information, semantic information and distance of anaphor-antecedent are seen important to determine the antecedent candidate. © 2012 Springer-Verlag.

关键词： Semantics

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Enhancing the system development process performance: A value-based approach

Enhancing the system development process performance: A valu...

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22nd Annual International Symposium of the International Council on systems engineering, INCOSE 2012 and the 8th Biennial European systems engineering Conference 2012, EuSEC 2012

作者： Mastrofmi, Manuel Cantone, Giovanni Seaman, Carolyn Shull, Forrest Diep, Madeline Falessi, Davide University of Rome Tor Vergata Department of Computer Science and Systems and Production Via del Politecnico 1 00133 Rome Italy Fraunhofer Center for Experimental Software Engineering University of Maryland Baltimore County Department of Information Systems ITE. Building. 1000 Hilltop Circle Baltimore MD 21250 United States Fraunhofer Center for Experimental Software Engineering 5825 University Research Court Suite 1300 College Park MD 20740-3823 United States Simula Research Laboratory Oslo Norway University of Rome Tor Vergata Department of Computer Science Systems and Production Via del Politecnico 1 00133 Rome Italy

ISBN: (纸本)9781622769162

When planning or controlling the system development process, a project leader needs to make decisions which take into account a number of aspects, including: availability of assets and competences, previously enacted processes in the organization, certifications the system is required to obtain, standards to comply with, interactions among process activities, contextual factors and constraints, and allocated budget and schedule. In this paper we propose a value-based approach for supporting decision making. The aim is to provide supportive information for decisions related to the system verification process. This would in turn enhance the performance of system development process by supporting the decision making process for complex systems. We report both academic and industrial empirical evaluations, which demonstrate the feasibility and effectiveness of our proposal, and thus prompt us to refine and extend our approach to sub-processes other than verification. ©2012 by the authors.

关键词： Decision making

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FSSC: An algorithm for classifying numerical data using fuzzy soft set theory

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International Journal of Fuzzy System Applications 2012年第4期2卷 29-46页

作者： Handaga, Bana Herawan, Tutut Deris, Mustafa Mat Faculty of Computer Science and Information Technology Universiti Tun Hussein Onn Malaysia Johor Malaysia Department of Computer Science Faculty of Computer Systems and Software Engineering Universiti Malaysia Pahang Kuantan Pahang Malaysia

Introduced is a new algorithm for the classification of numerical data using the theory of fuzzy soft set, named Fuzzy Soft Set Classifier (FSSC). The algorithm uses the fuzzy approach in the pre-processing stage to obtain features, and similarity concept in the process of classification. It can be applied not only to binary-valued datasets, but also be able to classify the data that consists of real numbers. Comparison tests on seven datasets from UCI Machine Learning Repository have been carried out. It is shown that the proposed algorithm provides better accuracy and higher accuracy as compared to the baseline algorithm using soft set theory. Copyright © 2012, IGI Global.

关键词： Classification (of information)

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software product line engineering of space flight software

Software product line engineering of space flight software

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International Workshop on Product Line Approaches in software engineering (PLEASE)

作者： Julie Street Fant Hassan Gomaa Robert G. Pettit Software Systems Engineering Department AeroSpace Corporation Chantilly USA Department of Computer Science George Mason University Fairfax USA

This paper presents a practical solution to a real life industrial problem in the unmanned space flight software (FSW) domain using software product lines and software architectural design patterns. In the FSW domain, there exists a significant amount of variability in the required capabilities. For example, some FSW have a significant amount of hardware to control and operate in a nearly autonomous fashion. In contrast, other FSW have a small amount of hardware to control and rely heavily of commanding from the ground station to operate the spacecraft. The underlying architecture and component interactions needed for the different FSWs are quite different. This amount of architectural variability makes it difficult to develop a SPL architecture that covers the all possible variability in the FSW domain. Therefore, this paper presents a practical solution to this real world problem that leverages software product line concepts and software architectural design patterns.

关键词： software Space vehicles Unified modeling language computer architecture Hardware Centralized control Connectors

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Towards Next Generation Requirements engineering

Towards Next Generation Requirements Engineering

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International Conference on Social Informatics (SocialInformatics)

作者： Terrill Fancott Pankaj Kamthan Nazlie Shahmir Department of Computer Science and Software Engineering Concordia University Montreal Canada Video Systems Engineering Shaw Cable Systems G.P. Calgary Canada

This paper analyzes the potential of the Mobile Social Web in facilitating the social dimension of agile requirements engineering. In doing so, an agile requirements engineering process (AREP) is presented. AREP consists of a nonlinear sequence of technical activities, each of which is supported by a number of social activities. A compendium of representative examples that illustrate the interplay between activities underlying AREP and Social Web applications is given. The relationships to other software project artifacts, and to open source software (OSS), are highlighted.

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A Cross-Layer Design for Decentralized Detection in Tree Sensor Networks

A Cross-Layer Design for Decentralized Detection in Tree Sen...

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International Conference on Distributed Computing in Sensor systems (DCOSS)

作者： Ashraf Tantawy Xenofon Koutsoukos Gautam Biswas Institute for Software Integrated Systems (ISIS) Department of Electrical Engineering and Computer Science Vanderbilt University Nashville TN USA

The design of wireless sensor networks for detection applications is a challenging task. On one hand, classical work on decentralized detection does not consider practical wireless sensor networks. On the other hand, practical sensor network design approaches that treat the signal processing and communication aspects of the sensor network separately result in sub optimal detection performance because network resources are not allocated efficiently. In this work, we attempt to cross the gap between theoretical decentralized detection work and practical sensor network implementations. We consider a cross-layer approach, where the quality of information, channel state information, and residual energy information are included in the design process of tree-topology sensor networks. The design objective is to specify which sensors should contribute to a given detection task, and to calculate the relevant communication parameters. We compare two design schemes: (1) direct transmission, where raw data are transmitted to the fusion center without compression, and (2) in-network processing, where data is quantized before transmission. For both schemes, we design the optimal transmission control policy that coordinates the communication between sensor nodes and the fusion center. We show the performance improvement for the proposed design schemes over the classical decoupled and maximum throughput design approaches.

关键词： Wireless sensor networks Wireless communication Quantization Media Access Protocol Random variables Optimization

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