【作者】 康件丽；

【导师】 沈记全；

【作者基本信息】 河南理工大学 ， 计算机应用技术， 2010， 硕士

【摘要】 网格的最终目的是消除信息孤岛,实现真正的资源共享。在河南省基础与前沿技术研究计划项目“领域自适应的网格服务组合算法研究与实现”的支持下,以网格服务质量评价与网格服务组合方法为目标,做了如下研究:(1)介绍了网格的概念,分析了网格的分布与共享性、动态性与多样性、协作性等特性。讨论了网格的体系结构,特别是目前流行的开放网格服务体系结构。(2)在分析了网格服务描述模型、评价概念树的基础上,给出了基于BP神经网络进行服务质量评价的实现过程,该方法通过建立BP网络模型实现对网格服务质量的合理评价,为提供高质量的网格服务奠定了基础。文中通过实例详细分析了此方法。实例表明,基于BP神经网络的网格服务质量评价方法通过高度的非线性映射揭示了网格服务评价结果与其相关影响因素之间的内在作用机理,具有较高的合理性和适用性。(3)讨论了基于领域模板的网格服务组合算法。分析了领域模板的基本概念、生成算法、匹配算法及自动更新算法。给出了服务组合算法的实现框架,详细讨论了领域模板匹配过程、输入参数匹配相似度算法流程、匹配算法的具体流程和模糊聚类自动更新算法实现过程。基于领域模板的网格服务组合算法使用户可以在业务层透明地组合服务,从而能够满足动态变化的业务需求。更多还原

【Abstract】 The ultimate goal of grid is to elimate the isolated information island and to realize the real sharing of resources. Surpported by Henan Research Program of Application Foundation and Advanced Technology–Dmain in Adaptive Grid Serive Composition Algorithm, aiming at the grid service evaluation and composition, the study aspects are as follows.(1) After introducing the concept of the grid, the thesis analyzes the characterisitics of the grid-distributivity, sharing, dynamic, diversity, collaboration, and so on. The grid architecture and especial OGSA (Open Grid Services Architecture) are introduced and discussed.(2) Based on the detailed analysis on the service description model and the appraisal concept tree, the evaluation procedure based on BP neural network is presented. The reasonable evaluation for the grid service can be gotten through the establishment of BP neural network model of service quality, which lays the foundation for the high quality service. Simulation results show that the grid service quality evaluation method based on BP neural network through a highly nonlinear mapping, reveals the essential relationship between the grid service evaluation result and the related factors, had the high rationality and applicability.(3) Grid service composition algorithms based on the domain template are discussed. The fundamental concept of the domain template, template generation method, template matching method and automatic updating method are analyzed. The main structure of the service composition algorithm is proposed. The procedures of the domain template matching algorithm, the matching similarity algorithm for the input parameters and the auto updating algorithm based on fuzzy clustering are discussed and analyzed. Grid service composition algorithm based on the domain template can provide the transparent composition services in the business layer for users, which can satisfy the dynamic requirement.更多还原