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Decision resource coordinate scheduling based on grid workflow

WSEAS Transactions on computers 2006年第6期5卷 1227-1235页

作者： Hu, Mingsheng Zhang, Jianjun Chen, Xueguang Institute of Systems Engineering Huazhong University of Science and Technology Wuhan 430074 China Institute of Software Science Zhengzhou Teachers College Zhengzhou 450044 China Department of Computer Science Xuchang College Xuchang 461000 China

Taking advantage of the Grid workflow, scientists and engineers are building more and more complex decision support applications to process large data sets, and coordinate scheduling distributed decision resources. Such decision resource scheduling processes require means for composing and executing complex workflows. Therefore, many efforts have been made towards the development of workflow scheduling systems for decision resource coordinate scheduling on Grid environment. In this paper, we investigates the emerging need for Grid workflow to aid decision support on the Grid and proposes a Grid workflow for decision resource scheduling that is a Petri net-based graph model and incorporates a reasoning system designed to perform such a task. It effectively hides the heterogeneity of decision resources with good intelligence, scalability and adaptability.

关键词： Decision support systems

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An ontological infrastructure for traveller information systems

An ontological infrastructure for traveller information syst...

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International Conference on Intelligent Transportation

作者： J.J. Samper V.R. Tomas J.J. Martinez L. van den Berg Computer Sciences Department University of Valencia Spain Software engineering and consulting the Intelligent Transportation Systems (ITS) University of Jaume Spain ITS-architectures and traffic enforcement University of Valencia Spain

Nowadays there are vocabularies or languages able to describe concepts and data structures related to road traffic. Nevertheless, this description provides only a syntactic approach and it forgot the semantic knowledge. There not exist vocabularies or ontologies with semantic value that add significance to the vocabulary concepts and their relations. The objective to be reached of this paper is to present the research developed to build a representation scheme of a particular domain: the road traffic, with a well defined semantics. The inclusion of this semantic allows to obtain a formalized knowledge model. This model enables the development of an integrated architecture of traffic information from semantic Web services. The ontologies created in this work are used to describe and add semantic value to the current parameters of the traffic services

关键词： Ontologies Information systems Intelligent transportation systems Vocabulary Traffic control Telecommunication traffic Roads computer science software engineering Application software

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DaTA -- Data-Transparent Authentication Without Communication Overhead

DaTA -- Data-Transparent Authentication Without Communicatio...

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International Conference on Security and Privacy for Emerging Areas in Communications Networks (SecureComm)

作者： Songqing Chen Shiping Chen Xinyuan Wang Sushil Jajodia Department of Computer Science George Mason University USA Center for Secure Information Systems George Mason University USA Department of Information and Software Engineering George Mason University USA

With the development of Internet computing techniques, continuous data streams from remote sites are commonly used in scientific and commercial applications. Correspondingly, there is increasing demand of assuring the integrity and authenticity of received data streams. Existing strategies of assuring data integrity and authenticity mainly use message authentication codes (MAC) generated on data blocks and transfer the MAC to the receiver for authentication through either out of band communication or in band communication. Transferring the MAC via out of band communication inevitably introduces communication overhead and additional complexity to synchronize the out of band communication with the data communication. Transferring the MAC via in band channel can be achieved by either appending the MAC to the original data or embedding the MAC into the original data, which would either incur communication overhead or change the original data. It would be desirable to be able to authenticate the stream data without any communication overhead and changing the original data at the same time. To deal with data packet or block loss, many of existing stream data authentication schemes rely on hash chaining, the current usage of which results in uncertainty in authenticating the subsequent data blocks once the first data packet or block loss is detected. In this paper, we propose a novel application layer authentication strategy called DaTA. This authentication scheme requires no change to the original data and causes no additional communication overhead. In addition, it can continue authenticating the rest of data stream even if some data loss has been detected. Our analysis shows that our authentication scheme is robust against packet loss and network jitter. We have implemented a prototype system to evaluate its performance. Our empirical results show that our proposed scheme is efficient and practical under various network conditions

关键词： Message authentication Internet Streaming media Hurricanes Demand forecasting computer science Information systems software engineering Data communication Propagation losses

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Routing Protocols for an Integrated Cellular and Ad-hoc Network with Flexible Access and Their Overhead Analysis

Routing Protocols for an Integrated Cellular and Ad-hoc Netw...

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International Conference on Innovative Computing, Information and Control (ICICIC)

作者： Yumin Wu Kun Yang Shaochun Zhong Wenyong Wang Jun Shen Department of Electronic Systems Engineering University of Essex Colchester UK School of Software Northeast Normal University Changchun China Department of Computer Science Beijing Institute of Technology Beijing China

This paper proposes an adaptive routing protocol called ARFA for an integrated cellular and ad hoc heterogeneous network with flexible access (iCAR-FA). An iCAR-FA system offers a flexible traffic diversion mechanism that allows a mobile host to utilize the bandwidth in another cell, as such easing the congestion problem and increasing the throughput in a cellular network. Based on the presentation of the iCAR-FA physical characteristics, the paper details the design issues and operation of ARFA. Detailed numerical analysis on routing overhead, which is along with some general evaluations, has indicated the effectiveness and efficiency of the ARFA protocol

关键词： Routing protocols Cellular networks Ad hoc networks Telecommunication traffic Land mobile radio cellular systems Bandwidth Numerical analysis Relays Frequency systems engineering and theory

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Evacuation Planning via Evolutionary Computation

Evacuation Planning via Evolutionary Computation

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Congress on Evolutionary Computation

作者： A. Garrett B. Carnahan R. Muhdi J. Davis G. Dozier M.P. SanSoucie P.V. Hull M.L. Tinker Department of Computer Science and Software Engineering Auburn University Auburn AL USA Department of Industrial & Systems Engineering Auburn University Auburn AL USA NASA Marshall Space Flight Center Huntsville AL USA

According to the Life Safety Code reg , the geometry of a building, the location of exits, and the number of exits dictate the means of egress for all people occupying a building. In this paper we show how evolutionary computations in the form of Genetic Algorithms and Estimation of Distribution Algorithms are used to evolve the placement of exits in order to optimize overall evacuation time. In particular, a generational GA, a steady-state GA, and an elitist EDA are used to evolve the placement of exits for two practical design problems. The algorithms are evaluated in terms of success rate, number of function evaluations, and best fitness. For both problems, the steady-state GA outperformed the other algorithms in all evaluation categories.

关键词： Evolutionary computation Safety Electronic design automation and methodology Buildings Humans Genetic algorithms Steady-state Fires NASA Geometry

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Economy-Based Data Replication Broker

Economy-Based Data Replication Broker

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IEEE International Conference on e-Science and Grid Computing

作者： Henry Lin J.H. Abawajy Rajkumar Buyya Grid Computing and Distributed Systems Laboratory Department of Computer Science and Software Engineering University of Melbourne Melbourne VIC Australia Grid and Pervasive Computing Laboratory School of Engineering and Information Technology Deakin University Geelong VIC Australia

ISBN: (纸本)9781424430116

Data replication is one of the key components in data grid architecture as it enhances data access and reliability and minimises the cost of data transmission. In this paper, we address the problem of reducing the overheads of the replication mechanisms that drive the data management components of a data grid. We propose an approach that extends the resource broker with policies that factor in user quality of service as well as service costs when replicating and transferring data. A realistic model of the data grid was created to simulate and explore the performance of the proposed policy. The policy displayed an effective means of improving the performance of the grid network traffic and is indicated by the improvement of speed and cost of transfers by brokers.

关键词： Resource management Australia Telecommunication traffic Power generation economics Cost accounting Protocols Grid computing Pervasive computing computer science software

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4.4.1 Fine-grained Method and Tool Integration for better Automotive software

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INCOSE International Symposium 2006年第1期16卷 606-620页

作者： Altheide, Frank Buhr, Kerstin Doerr, Heiko University of Paderborn Workgroup Database and Information Systems Germany Technical University of Berlin Institute for Software Engineering and Theoretical Computer Science Germany DaimlerChrysler AG Research & Technology Department Methods & Tools Germany

In the automotive field, software development methods and tools are used to cope with the high complexity of automotive software development. However, problems occur with the tracing of information, the assessment and monitoring of the development status, late and thus expensive changes, etc, which lead to increasing development costs and time as well as quality deficits. Our experience with recent projects have shown that the key to solving these problems lies in providing proper answers to the following questions: (1) How can development methods be assembled? (2) How can the use of a variety of development methods be supported by an appropriate tool?. To answer these questions, we introduce a tool integration approach that is strongly based on the integration of development methods. The contribution of this paper is (a) a method integration approach that considers finegrained method objects and their specific structure in addition to the usually considered artifacts, (b) an approach to tool integration that overcomes the deficits of heterogeneous tool environments and utilizes the results of the methodical understanding. © 2006 The Authors.

关键词： Integration

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A Model for Interoperability in computer Supported Collaborative Learning

A Model for Interoperability in Computer Supported Collabora...

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International Conference on Advanced Learning Technologies (ICALT)

作者： G. Kahrimanis A. Papasalouros N. Avouris S. Retalis Human-Computer Interaction Group ECE Department University of Patras Greece Software Engineering Lab National and Technical University of Athens Greece Department of Technology Education and Digital Systems University of Piraeus Greece

computer supported collaborative learning activities involve combination of complex software tools that often need to interoperate in a wider context of learning. This paper proposes a data model that accommodates requirements of typical collaborative learning situations and facilitates interoperability of tools and interchange of products of collaboration and evaluation data. The model has been tested against various typical tools used for both synchronous and asynchronous collaboration of groups of students

关键词： Collaborative work Collaborative tools Data models Pervasive computing software engineering Educational technology computer science education systems engineering education Digital systems software tools

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BlueGene/L Failure Analysis and Prediction Models

BlueGene/L Failure Analysis and Prediction Models

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International Conference on Dependable systems and Networks (DSN)

作者： Yinglung Liang Yanyong Zhang A. Sivasubramaniam M. Jette R. Sahoo Electrical & Computer Engineering Department Rutgers University USA Computational Resource Management Group Lawrence Livemore National Laboratory USA Computer Science & Engineering Department Pennslyvania State University USA Exploratory Systems Software Department IBM Thomas J. Watson Research Center USA

The growing computational and storage needs of several scientific applications mandate the deployment of extreme-scale parallel machines, such as IBM's BlueGene/L which can accommodate as many as 128 K processors. One of the challenges when designing and deploying these systems in a production setting is the need to take failure occurrences, whether it be in the hardware or in the software, into account. Earlier work has shown that conventional runtime fault-tolerant techniques such as periodic checkpointing are not effective to the emerging systems. Instead, the ability to predict failure occurrences can help develop more effective checkpointing strategies. Failure prediction has long been regarded as a challenging research problem, mainly due to the lack of realistic failure data from actual production systems. In this study, we have collected RAS event logs from BlueGene/L over a period of more than 100 days. We have investigated the characteristics of fatal failure events, as well as the correlation between fatal events and non-fatal events. Based on the observations, we have developed three simple yet effective failure prediction methods, which can predict around 80% of the memory and network failures, and 47% of the application I/O failures

关键词： Failure analysis Predictive models Production systems Checkpointing Concurrent computing Parallel machines Hardware Runtime Fault tolerant systems Prediction methods

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engineering reliability into hybrid systems via rich design models: recent results and current directions 06

Engineering reliability into hybrid systems via rich design ...

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International Symposium on Parallel and Distributed Processing (IPDPS)

作者： S. Banerjee L. Cheung L. Golubchik N. Medvidovic R. Roshandel G. Sukhatme Computer Science Department University of Southern California Los Angeles CA USA Department of Computer Science & Software Engineering Seattle University Seattle WA USA EE-Systems Department IMSC University of Southern California Los Angeles CA USA

ISBN: (纸本)9781424400546

software reliability techniques are aimed at reducing or eliminating failures in software systems. Reliability in software systems has traditionally been measured during or after system implementation. However, software engineering methodology lays stress on doing the "correct things" early on in the software development lifecycle in order to curb development and maintenance costs. In this paper, we argue that reliability of a software system should be assessed throughout the system's life span, starting with the software architecture level. Our research goal is to estimate the reliability of software systems in early design stages, which we believe involves the ability to reason about numerous uncertainties that exist in this stage, including uncertainty due to lack of execution artifacts. Our proposed approach is to develop techniques that will couple software architectural models with a suite of stochastic reliability estimation models and allow us to reason about these uncertainties. In this paper, we present our recent results using our technique for reliability estimation of software components at the level of software architecture. Another important part of this paper is the discussion of our ongoing research efforts and open research problems in this area

关键词： Reliability engineering Design engineering software systems Uncertainty software architecture software reliability software measurement software engineering Stress Programming

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