共查询到18条相似文献,搜索用时 125 毫秒
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针对水利行业对高效能计算力的需求,以工作流作为桥梁,将网格技术引入水利计算中,形成了水利网格工作流管理系统。介绍了水利网格工作流管理系统所应用的关键技术和设计过程,重点阐述了工作流引擎的设计思路,介绍了一种"基于关键路径的学习型工作流调度算法",并以松花江石油污染为假设对系统进行了实验,最后提出了几点改进要求。 相似文献
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粒子群优化算法在网格工作流调度中的应用 总被引:1,自引:1,他引:0
为了提高网格工作流管理系统的性能,将粒子群优化算法(PSO)引入到网格工作流的调度策略中.分析算法的基本原理,根据网格工作流调度的问题对其进行变形,提出基于粒子群优化算法的网格工作流调度策略,并与基于Dijkstra的网格工作流调度算法进行对比实验.实验数据表明,粒子群优化算法在网格工作流调度中的性能较好. 相似文献
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网格计算将是计算机技术未来发展的重点,而面向应用的网格中间件将是网格能否大规模应用的关键.提出一种基于工作流的网格中间件体系结构,利用工作流管理系统进行解析和控制流程,把所有的应用统一到网格服务的概念之下,建立一种统一的应用集成方案,以此来解决异构环境下的协同应用问题. 相似文献
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本文介绍了无锡台制作网的媒体融合建设,对异构非编的集成进行了分析,介绍了基于非结构化数据语义分析的工作流引擎技术、电视新闻资源的导出共享以及互联网媒体资源的采集。 相似文献
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现有的网格工作流调度算法大都利用遗传算法所具有的并行性和全局解空间搜索的特点来解决工作流调度问题.但是,现有的调度算法没有对动态调度问题进行处理.文中针对网格服务的动态性,提出了服务资源信息中心的概念并给出了网格工作流管理系统的体系结构.在现有的基于遗传算法的网格工作流调度算法的基础上提出了网格服务工作流动态调度算法,补充了不同工作流过程模型的适应度函数的计算. 相似文献
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本文研究TAgent技术在工作流管理系统中的运用,并根据工作流管理系统中agent的运用范围将运用agent的工作流管理系统分为两类:agent增强的工作流系统和基于agent的工作流系统。agent增强的工作流系统是对Agent技术的初步运用,基于agent的工作流系统是Agent在工作流系统的各个环节都得到应用,是集成Agent到工作流系统的最终目标。 相似文献
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科学工作流技术采用工作流的思想,用来描述和控制科学实验和科学过程的执行.基于构件组装的面向e-Science的科学工作流系统架构分为三层,包括数据资源层、工作流执行引擎层、运行服务层等.还介绍了该科学工作流架构在大气科学数据处理中的一个应用实例. 相似文献
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《Spectrum, IEEE》2004,41(8):35-39
An international collaboration of astronomers and computer scientists is piecing together the means to connect all stored data collected over the last several decades by hundreds of ground-based and orbiting observatories in thousands of archives. Their efforts will create the world's biggest and best telescope, known as the Virtual Observatory. VO will allow astronomers, as well as students and the general public to easily locate and download research data over the Internet. VO will also serve as a grid computing network, giving researchers, regardless of location of resources, the equivalent of a supercomputer on their desktops, for comparing billion-record archives or running large-scale simulations. VO encompasses a patchwork of projects organized under the International Virtual Observatory Alliance. The alliance includes more than 200 astronomers and computer scientists in at least 13 countries. Through the VO's various working groups, the scientists are hammering out standards to make the archives interoperable, outlining the necessary IT infrastructure, and defining the VO's scientific goals. 相似文献
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基于网格工作流的政务协同研究 总被引:1,自引:0,他引:1
随着网格基础设施的逐渐完善以及网格应用研究的深入,网格环境下电子政务中协同处理、协同服务的应用越来越复杂。针对网格环境下政务工作流特点以及传统支持跨部门工作流模型的缺点,在研究网格工作流基础上,提出了一个QoS约束的政务协同工作模型。最后通过一个应用实例来实现了模型的应用。 相似文献
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Autonomic workflow execution in the grid 总被引:1,自引:0,他引:1
Nichols J. Demirkan H. Goul M. 《IEEE transactions on systems, man and cybernetics. Part C, Applications and reviews》2006,36(3):353-364
Mobile agents are being leveraged in both workflow management and grid computing contexts. The convergence of these two research streams supports execution in the grid where tasks are allowed to vary in their level of interdependence. The result is an expansion of grid applications beyond those which consist of homogeneous computations decomposed and performed in parallel to those which support the parallel execution of sequences of interdependent tasks that constitute a workflow. However, grid computation of critical workflows requires that the grid platform exhibits the autonomic characteristic of self-healing in order to ensure workflow execution. To address this issue, in this work, we first develop a model for dynamic fault tolerance technique selection, which can be embedded generically in a mobile agent workflow management system. We then augment an existing architecture for flexible fault tolerance in the grid with our model, thus allowing the system to optimally configure its fault tolerance mechanisms through awareness of the computational environment. The result is a foundation for autonomic workflow management in the grid. 相似文献
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Xiujun Gong Kensuke Nakamura Hua Yu Kei Yura Nobuhiro Go 《IEEE transactions on information technology in biomedicine》2007,11(4):428-434
The emerging grid computing technologies enable bioinformatics scientists to conduct their researches in a virtual laboratory, in which they share public databases, computational tools as well as their analysis workflows. However, the development of grid applications is still a nightmare for general bioinformatics scientists, due to the lack of grid programming environments, standards and high-level services. Here, we present a system, which we named Bioinformatics: Ask Any Questions (BAAQ), to automate this development procedure as much as possible. BAAQ allows scientists to store and manage remote biological data and programs, to build analysis workflows that integrate these resources seamlessly, and to discover knowledge from available resources. This paper addresses two issues in building grid applications in bioinformatics: how to smoothly compose an analysis workflow using heterogeneous resources and how to efficiently discover and re-use available resources in the grid community. Correspondingly an intelligent grid programming environment and an active solution recommendation service are proposed. Finally, we present a case study applying BAAQ to a bioinformatics problem. 相似文献
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网格资源需求的不断增长使价格成为资源进行竞争的有效手段,有向无环图DAG(Directed Acyclic Graph)表示的工作流时间费用优化问题是网格环境下一个重要问题.通常情况下,DAG应用调度属于NP-Hard问题.通过分析活动间的时序特征,给出时间耦合强度TCS (Time-dependent Coupling Strength)的定义,用于标识一个活动最大的时间耦合活动个数;将其作为优先级规则的一个重要信息和BF规则(Best Fit)结合,设计出时间耦合强度最适规则BFTCS ( Best Fit with Time-dependent Coupling Strength),用于启发式算法的改进阶段,逐步提高初始可行解的性能.模拟实验结果表明,相对现有的启发式算法,基于BFTCS规则的启发算法能获得最好的性能和较快的运行效率;最后讨论了问题参数对算法性能和效率的影响. 相似文献
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Pivotal Technology Research of Grid Based on Mobile Agent 总被引:3,自引:0,他引:3
Grid Based on Mobile Agent is a new grid scheme. The purpose of the paper is to solve the pivotal technology of Grid Based on Mobile Agent ( GBMA) combined with thought of Virtual Organization ( VO). In GBMA, virtual organization is viewed as the basic management unit of the grid, and mobile agent is regarded as an important interactive means. Grid architecture, grid resource management and grid task management are the core technology problem of GBMA. The simulation results show that Inter- VO pattern has the obvious advantage because it can make full use of resources from other virtual organizations in GBMA environment. 相似文献