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International Symposium on computer Architecture and High Performance Computing (SBAC-PAD)

作者： Tianchi Ma R. Buyya Grid Computing and Distributed Systems (GRIDS) Laboratory Department of Computer Science and Software Engineering University of Melbourne Australia

Parameter-sweep has been widely adopted in large numbers of scientific applications. Parameter-sweep features need to be incorporated into grid workflows so as to increase the scale and scope of such applications. New scheduling mechanisms and algorithms are required to provide optimized policy for resource allocation and task arrangement in such a case. This paper addresses scheduling sequential parameter-sweep tasks in a fine-grained manner. The optimization is produced by pipelining the subtasks and dispatching each of them onto well-selected resources. Two types of scheduling algorithms are discussed and customized to adapt the characteristics of parameter-sweep, as well as their effectiveness has been compared under multifarious scenarios.

关键词： Scheduling algorithm Application software Sensor arrays Grid computing Filtering Data visualization Processor scheduling Resource management Laboratories computer science

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Cost-based scheduling for data-intensive applications on global grids 05

Cost-based scheduling for data-intensive applications on glo...

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International Symposium on High Performance Distributed Computing

作者： S. Venugopal R. Buyya Grid Computing and Distributed Systems (GRIDS) Laboratory Department of Computer Science and Software Engineering University of Melbourne Australia

We present an algorithm for scheduling distributed data intensive bag-of-task applications on data grids that have costs associated with requesting, transferring and processing datasets. We evaluate the algorithm on a... 详细信息

ISBN: (纸本)9780780390379

关键词： Processor scheduling Costs Grid computing Application software Physics computer networks Laboratories computer science software engineering Testing

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Facilitating the construction of specification pattern-based properties

Facilitating the construction of specification pattern-based...

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IEEE International Conference on Requirements engineering

作者： S. Konrad B.H.C. Cheng Software Engineering and Network Systems Laboratory Department of Computer Science and Engineering Michigan State University East Lansing MI USA

Formal specification languages are often perceived as difficult to use by practitioners, and are therefore rarely-used in industrial software development practices. Numerous researchers have developed specification pattern systems to facilitate the construction of formal specifications of system properties. Feedback indicates that these patterns are considered helpful, but many practitioners prefer capturing properties using informal notations, such as natural language, instead of formal specification languages. This paper describes a project that addresses this technology gap. First, we introduce a stepwise process for deriving and instantiating system properties in terms of their natural language representations. The key components of this process are structured natural language grammars and specification pattern systems. Second, we describe SPIDER, a prototype implementation of a tool suite supporting this specification process. We illustrate the use of our approach with a description of a stepwise construction process of property specifications of a real-world automotive embedded system using Spider.

关键词： Natural languages Formal specifications Logic Construction industry Feedback Automotive engineering Industrial training Pattern analysis software engineering Laboratories

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MNP: Multihop Network Reprogramming Service for Sensor Networks

MNP: Multihop Network Reprogramming Service for Sensor Netwo...

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International Conference on Distributed Computing systems

作者： S.S. Kulkarni Limin Wang Software Engineering and Network Systems Laboratory Department of Computer Science and Engineering Michigan State University East Lansing MI USA

Reprogramming of sensor networks is an important and challenging problem as it is often necessary to reprogram the sensors in place. In this paper, we propose a multihop reprogramming service designed for Mica-2/XSM motes. One of the problems in reprogramming is the issue of message collision. To reduce the problem of collision and hidden terminal problem, we propose a sender selection algorithm that attempts to guarantee that in a neighborhood there is at most one source transmitting the program at a time. Further, our sender selection is greedy in that it tries to select the sender that is expected to have the most impact. We also use pipelining to enable fast data propagation. MNP is energy efficient because it reduces the active radio time of a sensor node by putting the node into "sleep" state when its neighbors are transmitting a segment that is not of interest. Finally, we argue that it is possible to tune our service according to the remaining battery level of a sensor, i.e., it can be tuned so that the probability that a sensor is given the responsibility of transmitting the code is proportional to its remaining battery life

关键词： Spread spectrum communication Wireless sensor networks Bandwidth Sensor systems Energy efficiency Batteries software engineering Laboratories computer science Pipeline processing

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Generating aspects-classes integration testing sequences a collaboration diagram based strategy

Generating aspects-classes integration testing sequences a c...

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International Conference on software engineering Research, Management and Applications (SERA)

作者： P. Massicotte M. Badri L. Badri Software Engineering Laboratory Department of Mathematics and Computer Science University of Quebec Trois-Rivières Trois-Rivieres QUE Canada

Aspect-oriented software development is an emerging software engineering paradigm. It provides new constructs and tools to improve separation of crosscutting concerns into single units called aspects. The aspect paradigm introduces, in fact, new abstractions in software development. AspectJ is an aspect-oriented extension for Java. Actually, existing object-oriented programming languages suffer from a serious limitation in modularizing adequately crosscutting concerns. Many concerns crosscut several classes in an object-oriented system. However, the aspect paradigm introduces new dimensions in terms of control and complexity. New dependencies between aspects and classes result in new testing challenges. In fact, aspects can interact with any class in a program. Interactions between aspects and classes are new sources for program faults. Object-oriented testing techniques do not cover the new dimensions introduced by aspects. Thus, new aspect-oriented testing techniques must be developed. We propose, in this paper, a new technique to generate test sequences based on the dynamic interactions between aspects and classes. We focus, in particular, on the integration of one or more aspects in a collaboration between a group of objects. The paper also introduces associated testing criteria. The proposed approach follows an iterative process.

关键词： Collaboration software engineering software testing Object oriented programming Collaborative software Laboratories mathematics computer science Java Iterative methods

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A time optimization algorithm for scheduling bag-of-task applications in auction-based proportional share systems

A time optimization algorithm for scheduling bag-of-task app...

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International Symposium on computer Architecture and High Performance Computing (SBAC-PAD)

作者： A. Sulistio R. Buyya Grid Computing and Distributed Systems (GRIDS) Laboratory Department of Computer Science and Software Engineering University of Melbourne Carlton VIC Australia

Grid and peer-to-peer (P2P) network technologies enable aggregation of distributed resources for solving large-scale and computationally-intensive applications. These technologies are well-suited for bag-of-tasks (BoT) applications, because each application consists of many parallel and independent tasks. With multiple users competing for the same resources, the key challenge is to finish a user application within a specified deadline. In this paper, we propose a time optimization algorithm that schedules a user application on auction-based resource allocation systems. These allocation systems, which are based on proportional share, allow users to bid higher in order to gain more resource shares. Therefore, this algorithm adjusts a user bid periodically on these systems in order to finish the application on time.

关键词： Scheduling algorithm Application software Resource management Peer to peer computing Processor scheduling Grid computing computer applications Large-scale systems computer networks Distributed computing

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Cost-based scheduling of scientific workflow applications on utility grids

Cost-based scheduling of scientific workflow applications on...

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IEEE International Conference on e-science and Grid Computing

作者： Jia Yu R. Buyya Chen Khong Tham Grid Computing and Distributed Systems Laboratory Department of Computer Science and Software Engineering University of Melbourne VIC Australia Department of Electrical and Computer Engineering National University of Singapore Singapore

Over the last few years, grid technologies have progressed towards a service-oriented paradigm that enables a new way of service provisioning based on utility computing models. Users consume these services based on their QoS (quality of service) requirements. In such "pay-per-use" grids, workflow execution cost must be considered during scheduling based on users' QoS constraints. In this paper, we propose a cost-based workflow scheduling algorithm that minimizes execution cost while meeting the deadline for delivering results. It can also adapt to the delays of service executions by rescheduling unexecuted tasks. We also attempt to optimally solve the task scheduling problem in branches with several sequential tasks by modeling the branch as a Markov decision process and using the value iteration method

关键词： Optimal scheduling Processor scheduling Scheduling algorithm Workflow management software Grid computing Quality of service Costs computer networks Time factors Delay

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Investigating manifold learning algorithms based on magnification factors and principal spread directions

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Jisuanji Xuebao/Chinese Journal of computers 2005年第12期28卷 2000-2009页

作者： He, Li Zhang, Jun-Ping Zhou, Zhi-Hua Shanghai Key Laboratory of Intelligent Information Processing Department of Computer Science and Engineering Fudan University Shanghai 200433 China Key Laboratory of Complex Systems and Intelligence Science Chinese Academy of Sciences Shanghai 200433 China Department of Computer Science and Engineering School of Mathematical Sciences Fudan University Shanghai 200433 China National Laboratory for Novel Software Technology Nanjing University Nanjing 210093 China

As a new unsupervised learning technique, manifold learning has captured the attention of many researchers in the field of machine learning and cognitive sciences. The major algorithms include Isometric mapping (ISOMAP) and Locally Linear Embedding (LLE). The approaches can be used for discovering the intrinsic dimensions of nonlinear high-dimensional data effectively and aim researchers to analyze the data better. How to quantitatively analyze the relationship between the intrinsic dimensions and the observation space, however, has fewer reports. And thus further works in manifold learning may have suffered some difficulties. The paper focuses on two kinds of manifold learning algorithms (ISOMAP, LLE), and discusses magnification factors and principal spread directions from the observation space to the intrinsic low-dimensional space. Also the corresponding algorithm is proposed. Experiments show the effectiveness and advantages of the research.

关键词： Learning algorithms

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Cost-benefit trade-off analysis using BBN for aspect-oriented risk-driven development

Cost-benefit trade-off analysis using BBN for aspect-oriente...

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10th IEEE International Conference on engineering of Complex computer systems, ICECCS 2005

作者： Houmb, Siv Hilde Georg, Geri France, Robert Bieman, James Jürjens, Jan Department of Computer Science Norwegian University of Science and Technology Sem Sælands Vei 7-9 NO-7491 Trondheim Norway Software Assurance Laboratory Department of Computer Science Colorado State University 601 S. Howes St. Fort Collins CO 80523-1873 United States Systems Engineering TU Munich Boltzmannstr. 3 85748 München/Garching Germany

Security critical systems must perform at the required security level, make effective use of available resources, and meet end-users expectations. Balancing these needs, and at the same time fulfilling budget and time-to-market constraints, requires developers to design and evaluate alternative security treatment strategies. In this paper, we present a development framework that utilizes Bayesian Belief Networks (BBN) and Aspect-Oriented Modeling (AOM)for a cost-benefit trade-off analysis of treatment strategies. AOM allows developers to model pervasive security treatments separately from other system functionality. This ease the trade-off by making it possible to swap treatment strategies in and out when computing Return on Security Investments (RoSI). The trade-off analysis is implemented using BBN, and RoSI is computed by estimating a set of variables describing properties of a treatment strategy. RoSI for each treatment strategy is then used as input to choice of design. © 2005 IEEE.

关键词： computer networks

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Quasiperiodic Route to Chaotic Dynamics of Internet Transport Protocols

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Physical Review Letters 2005年第19期94卷 198702-198702页

作者： Jian-Bo Gao Nageswara S. V. Rao Jing Hu Jing Ai Department of Electrical and Computer Engineering University of Florida Gainesville Florida 32611 USA Computer Science and Mathematics Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Electrical Computer and Systems Engineering Department Rensselaer Polytechnic Institute Troy New York 12180 USA

We show that the dynamics of transmission control protocol (TCP) may often be chaotic via a quasiperiodic route consisting of more than two independent frequencies, by employing a commonly used ns-2 network simulator. To capture the essence of the additive increase and multiplicative decrease mechanism of TCP congestion control, and to qualitatively describe why and when chaos may occur in TCP dynamics, we develop a 1D discrete map. The relevance of these chaotic transport dynamics to real Internet connections is discussed.

关键词： Chaos theory

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