共查询到20条相似文献，搜索用时 46 毫秒
1.
As a semantic foundation, ontology is extensively applied in areas such as information retrieval, artificial intelligence, semantic web and knowledge management and so on. This study adopts the ideas of reuse in software system model to combine the construction of an evaluation system and ontology against the static drawbacks in current construction of an evaluation system. It takes advantage of the concepts in domain ontology to make a domain stipulation and model mapping. Besides, it is the first time to apply the concepts to the construction of FDI evaluation system. It has important significance for socio-economic areas and it provides exploratory methods and routes for how component library can be reasonably adaptive and assemble the required components. 相似文献
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基于本体的茶叶知识服务系统研究与实现 总被引：1，自引：1，他引：0
传统农业知识服务系统缺乏语义支持,并且在农业领域应用极为不足,本研究提出利用本体论和语义网知识建立知识服务系统的必要性。以茶叶领域为例,分析了生产过程中各类用户的实际需要,设计了适合农业生产实际的茶叶知识服务系统工作流程与主要模块,模块由三层架构组成：用户服务接口,知识服务平台以及知识库。描述了系统实现中的关键技术,如茶叶本体的构建方法,系统信息抽取算法以及系统的具体实现等,初步实现了系统功能。 相似文献
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For incarnating the effects of the preference of the potential users of residential areas or decision makers on the evaluation of architecture design schemes,a two hierarchy multi-attribute group decision model is established.How to obtain the decision matrix of expert evaluation incarnates the influence of difference of professional knowledge among experts on decision.Multi-attribute decision making method based on uncertain linguistic assessment is used to determine the users' preference on schemes.The weight of attributes is determined by a optimization model that makes the difference of attribute assessment between expert and user minimum,and those weights are used in expert decision.This can enable the model to reflect correctly the actual situation of such decision making question. 相似文献
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本体是一种能够有效提高农作物种质资源整合、共享和利用效率的组织方式。在分析传统本体构建方法的基础上,结合中国农作物种质资源自身的特点,提出结构化数据与非结构化数据相结合的半自动化本体构建方法。该方法首先基于面向对象的思想从关系数据库中抽取概念及其关系建立初始本体;然后从非结构化的网站数据中提取概念,并利用在线字典WordNet和网络百科全书Wikipedia丰富概念的语义,完善初始本体。使用本体构建工具Protégé构建了农作物种质资源本体模型。实验表明,该方法既充分利用了数据库中的资源,又考虑了非结构化数据的补充作用,减少了构建成本,本体更加完善。探讨了本体进化的途径,指出了本研究的优点和局限性。 相似文献
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The service-oriented manufacturing paradigm is a new advanced manufacturing paradigm. In order to support it, a cloud service resource sharing model for service-oriented manufacturing is proposed. Based on the analysis of the features of manufacturing resource under the service-oriented manufacturing, concepts of cloud service resource and cloud service resource pool are defined, then service-oriented manufacturing resource and service-oriented process are realized through resource unified modeling, resource matching and resource optimization. The cloud service resources are classified by ontology method, then semantic and vector distance algorithm are adopted for intelligent search. Finally, service mode and realization technology are verified through a PLM soft resource application case. Theoretical analysis and experimental results suggest that the proposed resource service sharing model can meet the requirements of the service-oriented manufacturing. 相似文献
6.
Monitoring the material decay make use of the technique of video, computer image processing and pattern identify to detect, process and manage the external material decay image. The color character of the external material decay image are analyzed. The statistics character of the material decay image is pick-up by color histogram, color coherence vector and color correlogram. The comparability of the material decay image is presented by Euclidean distance of the color character. The match and query system of material decay based on image retrieval technology is implemented. 相似文献
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基于本体推理和数据挖掘的良好农业规范专家系统 总被引：1，自引：0，他引：1
针对良好农业规范(good agricultural practices,GAP)标准内容复杂,不易被农业生产者准确使用的问题,将本体推理和数据挖掘技术相结合,构建了良好农业规范专家系统,实现标准知识查询和GAP控制点推荐等功能,更好的帮助生产者理解和使用GAP。系统构建过程中,采用本体知识表示方法构建GAP标准知识库,通过解析“良好农业规范生产和认证信息服务平台”的GAP电子检查表记录,对挖掘过程中涉及的关联规则算法进行分析和改进,挖掘分析了用户对控制点使用的偏好。设计了控制点评价模型,实现了GAP控制点的择优推荐。系统基于MVC模式,设计为3层体系架构。通过测试应用,用户能够准确和容易的使用GAP标准。 相似文献
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An item-document weight matrix representing the web pages could be generated by constructing the vector space model. Since the efficiency of direct classification through the high-dimensional matrix is relatively low, a fuzzy webpage text classification algorithm combined with improved nonnegative matrix factorization (NMF) is presented. Firstly, the original high-dimensional data are mapped into the low-dimensional semantic space via an iterative normalized compression NMF(NCMF) to reduce the complexity of the problem. Secondly, in order to solve the problem of categorizing ambiguous words by using deterministic matrices, fuzzy logic is incorporated into the classification model, where the fuzzy categorization set of the document is constructed with the fuzzy membership degree between features and categories. Comparative experiment results demonstrate the proposed classification algorithm possesses higher accuracy and better time performance. 相似文献
10.
Aiming at knowledge representation problem of expert system for rotary machinery fault diagnosis, semantic net knowledge representation is discussed. Semantic net to represent expert knowledge of rotary machinery fault diagnosis is explored. Its realizing method is afforded in computer language, in addition, demostrating model is also developed in Visual C++. The result shows good validity of the knowledge representation. 相似文献
11.
The web documents classification is an important research content of web mining. Document vector space model is the foundation of automatic classification of documents, while it is difficult to eliminate redundant attributes and reduce the dimension of the vector space. The Rough Sets Theory is applied to generalize the information system comprised by document samples set, and to compute the best reducing properties set. So dimension of document feature space is reduced greatly, and disturbance to document classification is decreased too, which improve the efficiency of classification. In addition, using the advantage of adaptive classification and incremental learning of Fuzzy ARTMAP neural network, the online adaptive classification of web document is achieved. 相似文献
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As the important method and instrument of agile manufacture,the technology of distributed collaborative design and manufacturing has become the hotspot of manufacturing. The basic concept and key technologies of IP_VPN are introduced in this paper,and a collaborative design network model based on IP_VPN is presented. Distributed collaborative design is a multi_user,multitask involved system, which is consisted of lots of collaborative processs,so the network security is the key of distributed collaborative design. We research on the security of collaborative design network based on IP_VPN, hence get a conclusion:we can construct an economical?practical and secure collaborative design network system by the application of data encryption,user authentication and access control based on the role,etc. 相似文献
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A product family extension configuration method based on evaluation model for customer demands, relational mapping and extension association rules is introduced to better realize rapid and effective product configuration. A demand-based evaluation model is confirmed by the information of customer demands and a mapping relationship between demand-based model and characters of product family cases is built. The similarity between evaluation model and product family cases is up to the association rules and a product family case with the highest similarity can be extracted according to association rules. According to the situation of the similarity, the extracted case is modified to meet the demands of configuration with case-based reasoning method. The method is validated by a speed reducer case. 相似文献
14.
针对水产养殖企业流程各异,品种不一,生产过程关键控制点不同导致采集的信息异构、难以有效共享和缺乏共同理解等问题,采用本体作为知识的表示方法,根据水产养殖领域的特点提出了一种新的领域本体的构建方法,将构建过程划分成规范化、概念化和本体实现3个阶段,并组成一个本体构建迭代流程。这种本体构建方法易学、易用,减少了系统开发的工作量,为解决本体的快速构建问题提供了一个新的思路。 相似文献
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国家农业图书馆文献传递服务分析与发展对策 总被引：1，自引：0，他引：1
文献传递是图书馆为满足用户需求而采取的一种资源共建共享策略的基本途径。笔者简述了国家农业图书馆文献传递的现状,概括了国家农业图书馆文献传递工作的特点,分析了国家农业图书馆文献传递服务面临知识产权保护不断加强、文献获取途径日趋多元化的挑战,存在文献满足率不高、文献传递信息管理不完善、文献传递费用较高、宣传力度不够的问题,提出规避版权问题、开发农业领域特色文献和网络文献数据库、深入用户调查以合理定价、拓展文献来源渠道、建立文献传递数据归档系统、广泛开展宣传培训、提高工作人员的职业素质以尽力满足读者需求等建议和完善措施。 相似文献
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For using smooth probability density function to retrieve wavelet coefficient histogram and coefficient module histogram, parameter estimation is complicated, which results in hard to retrieve the texture features effectively. A texture image retrieval method using double density dual tree complex wavelet Refined Histogram(RH) model is proposed. By analyzing the principle of double density dual tree complex wavelet transform (DD-DT CWT) and the inherent relationship between the nonuniform quantizer and RH model, the RH model is extended to retrieve the DD-DT CWT coefficient and the coefficient histogram feature. The RH is used to model the magnitude of the DD-DT CWT. The RH parameters for all magnitude of complex coefficients forms the signature of an image. Image similarity measurement is accomplished by using the Kullback-Leibler divergences . The proposed method combines the advantages of the RH model and the shift-invariant DD-DT CWT. The experiment results show that the proposed methods yields higher retrieval rate than using the General Gaussian Density(GGD) model to fit with the real part or imaginary part of coefficients, and is better than using the Gamma PDF to fit with the magnitude of coefficients. 相似文献
17.
【研究目的】为了实现遥感影像的作物自动分类，并探索空间信息在分类中作用，【方法】本文提出结合光谱和空间信息的作物分类方法。首先，借助光谱信息实现地物初始分割，然后以目标作物历史空间分布为语义约束，根据隶属度提取目标作物。最后，在多时相遥感影像条件下，以冬小麦为目标作物进行了方法的验证，【结果】结果显示，本文方法可实现冬小麦自动提取与识别，总体精度为95.33%，Kappa系数为0.90，可满足农情监测的实际需求。另外，在单时相遥感影像条件下，本文结合几何语义知识的作物分类精度也达到了较高水平。【结论】相对于遥感影像单一光谱信息的分类方法，本文方法利用了作物空间信息，不仅能满足精度要求，还实现了分类的自动化，对工程化应用具有一定的参考价值。 相似文献
18.
Zeag Yongning Tong Fu 《保鲜与加工》1989,(2):43-49
An optimization approach for multi-relational joins based on
the matching concept in graph theory is introduced. The basic idea lies in constructing a join graph from an expression of N-relation query, and seeking for a maximun matching with minimun total weight. The algorithm for bipartition(X, Y) is proposed in this paper. 相似文献
19.
Concept of stability is vague, but it is basic characteristic of dynamic system, and precondition that make all kinds of control system run normally. Today it is still a challenge to analyze stability for uncertainty complex control system, whose mathematic modeling is impossible or very difficult, so it is very hard to judge whether a system running is stable or not by mathematic stability criterion. A kind of analyzing method is presented, which combine absolute stability with self-locked concept of heuristic search, it may analyze system stability in more range through adjusting self-collected loop parameters for uncertain control system based on knowledge control model. It is shown that stability analyzing method is effective and suitable for practical physical system in the engineering project. 相似文献
20.
When the EPC contract dispute occurs, complex relationship is usually involved, contract claim amount is large, and the consequence of hindering a contract is serious. Therefore, in order to prevent, warn and track disputes, based on some information with strong signs showing disputes, this study establishes a case based reasoning and rule based reasoning (CBR+RBR) model with qualitative and quantitative integration by synthetically using reasoning theory, rough set theory, the entropy method and Euclidean distance retrieval method to prevent and warn possible disputes and realize real-time tracking. By collecting related cases and establishing case databases, we use the CBR+RBR model to analyze various factors may cause EPC contract disputes, and through case analysis to validate that the model can warn EPC contract disputes. 相似文献