共查询到18条相似文献,搜索用时 62 毫秒
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指出一种基于Petri网的Web服务组合的化简方法,此方法包括建模和化简两个阶段。首先,Petri网结合工作流模式建模Web服务组合:然后通过Petri网的三种性质(可达性,安全性以及死锁)定义出Web服务组合结构,最后运用流程化简规则化简Web服务组合。 相似文献
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针对当前军用飞机NPD(Noise-Power-Distance)数据集成过程中面临小样本、小范围及数据失真问题,给出基于范例推理监督的支持向量机预测方法。用支持向量机作为数据回归与预测模型,通过范例推理检索出与目标范例相似的NPD数据,用相似范例来指导NPD数据的回归与预测。提出基于坡度的相似性检索、检验及修正方法,成功将范例推理的监督作用与预测模型有机结合,降低预测模型对数据样本的敏感性及依赖性。实例表明,该方法经济可行,能提高回归及预测精度。 相似文献
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Web服务时目前SOA应用中采用最为广泛的技术.随着Web服务的不断发展,Web服务的数最快速增加.如何在海量的Web服务中.快速的查找到用户所需的服务.己经成为Web服务相关技术中最重要的问题之一,目前已有的服务发现技术大多是基于关键字匹配的,虽然简单,但是在查全率和查准率存在不足,因此.对语义Web进行研究.以期能够提高Web服务查找的查全率和查准率. 相似文献
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如何动态地选择出适合用户需求的Web服务已经成为应用Web服务的关键问题。为提高Web服务的查找效率,提出一种支持QoS的语义Web服务发现框架。首先利用聚类技术,将相似度高的服务聚为一类,过滤掉与服务请求完全不同类别的服务,形成候选服务集。其次在对服务质量匹配的基础上,引入信誉机制,联合第三方机构,及时更新QoS的值,为请求者选择QoS综合值最高的服务,从而提高服务查询的精度和效率。 相似文献
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针对目前基于网络服务业务过程执行语言(BPEL)的网络服务合成方法缺乏网络服务的兼容性分析机制,不能保证基于网络服务技术的业务过程正确执行的问题,建立了一种能从形式化的角度描述网络服务的接口交互情况的基于Petri网的多元工作流组合网模型,提出了一种能更快地获得网络服务可用性结果的网络服务兼容性判断算法.最后,提出了基于该算法的原型系统架构. 相似文献
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Injection mould design generally lies on the critical path of a new product development. The design efficiency will have significant impact on the overall lead time of a new product. This paper presents a prototype injection mould-design system using a hybrid case-based reasoning (HCBR) approach. Case-based reasoning (CBR) is a solving paradigm that uses previous episodes on solving problems similar to the problem at hand (the new problem) as the basis for solving the new problem. In this hybrid system, CBR is incorporated with generalized design knowledge, and provides a flexible and comprehensive model of design. The knowledge base of the system would be accessed by mould designers through interactive programs so that their own intelligence and experience could also be incorporated with the total mould design. The approach provides a workable model of mould design system with CBR and knowledge-based expert system intelligent support, which could suggest good and proven design solutions to new design problems quickly, avoiding the time necessary to create those designs from scratch, for the plastic products manufacturing industry. 相似文献
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Abnormal production (AP) is an unavoidable evil in which manufacturers must hold all production resources until the AP issue is resolved. This study proposes a new case-based diagnosis mechanism (named eDM) that allows manufacturers to accelerate AP resolution. eDM consists of two intelligent agents implemented by an enhanced case-based reasoning algorithm. Also, eDM provides the AP factor analysis result from four dimensions: human operator, equipment, raw material, and production method. The feature-aggregation function diagnoses AP by inferring the potential symptoms to improve the accuracy of the AP factor analysis. To validate the feasibility and efficiency of eDM, this study investigates a manufacturer in Taiwan as the experimental target and conducts two field experiments. Experimental results show that for all the cases the diagnosis can be accomplished after two to three iterations of eDM. Compared with a general diagnosis process in terms of 188 cases, eDM evaluates, on average, seven to eight cases for each iteration that exhibits a relative increase in reasoning efficiency. eDM is also shown to be an intelligent expert system that provides inexperienced production engineers (PEs) with suggestions based on historical cases to accelerate the AP resolution process. 相似文献
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Cities emit extensive carbon emissions, which are considered a major contributor to the severe issue of climate change. Various low-carbon development programs have been initiated at the city level worldwide to address this problem. These practices are invaluable in promoting the development of low-carbon cities. Therefore, an effective approach should be developed to help decision makers select the best practices from previous experience on the basis of the impact features of carbon emission and city context features. This study introduces a case-based reasoning methodology for a specific city to select the best practices as references for low-carbon city development. The proposed methodology consists of three main components, namely, case representation, case retrieval, and case adaption and retention. For city representation, this study selects city context features and the impact features of carbon emission to characterize and represent a city. The proposed methodology is demonstrated by applying it to the selection of the best practices for low-carbon development of Chengdu City in Sichuan Province, China. 相似文献