共查询到20条相似文献，搜索用时 252 毫秒
1.
模糊集理论几十年来在许多领域都得到了广泛的应用,特别是在模糊信息处理及模式识别中的应用。在图像物体特征提取和识别方面,数学形态学是一门非常实用的图像处理技术。基于完备格上的数学形态学,以此推导在模糊集理论上建立数学形态学,并讨论了模糊形态学算子的相关性质。 相似文献
2.
直觉模糊集在处理模糊性、犹豫模糊性等不确定性方面比传统模糊集更灵活和实用,是模糊集的进一步推广。相似度是刻画两个(直觉)模糊集相似程度的工具,在直觉模糊多属性决策中有重要应用,但通过对现有文献中所采用的相似度方法进行分析,发现在某些情形下反映的相似度与实际相似度不符,为此给出一种新的相似度计算公式,据此提出基于直觉模糊相似度的逼近理想点排序(TOPSIS)法,并将其应用到多属性决策问题中,最后通过实例说明其合理性和有效性。 相似文献
3.
基于直觉模糊集的风险投资项目风险群体评价方法 总被引：1，自引：0，他引：1
对风险投资项目的风险评估是风险投资运作过程中的关键环节。针对风险投资项目的系统风险很难量化的特点,引入针对风险投资项目的系统风险评价指标体系和直觉模糊集理论,建立了基于直觉模糊数的加权平均(IFWA)算子和直觉模糊数混合集结(IFHA)算子的风险投资项目风险评价方法,并进行了实例分析,说明了该方法的实用性和有效性。 相似文献
4.
5.
模糊关系数据库的数据表达和模糊查询 总被引：2，自引：0，他引：2
将模糊集合理论和可能性理论应用于数据库中,提出不确定／不精确数据的表达方式,将关系数据库扩展为模糊关系数据库,介绍模糊关系数据库的数据模型、模糊数据和表达方法。 相似文献
6.
本文讨论了正态分布参数的模糊贝叶斯估计问题。利用模糊集理论和传统贝叶斯估计方法,获得了正态分布参数的模糊贝叶斯估计量。 相似文献
7.
8.
针对传统QFD方法不能有效地处理实施过程中的各种主观的、模糊的信息,引入模糊集合理论,建立了基于模糊QFD的工程项目过程协同管理模型。 相似文献
9.
10.
模糊决策树中四种匹配算法的对比研究 总被引：1，自引：0，他引：1
模糊决策树推理是基于模糊表示的示例学习的一种重要方法,模糊推理方法的选择在很大程度上影响推理的性能和效果。本文介绍了四种基于不同模糊算子的模糊推理方法,并通过实验对这些方法的训练精度和测试精度进行了评判和排序。 相似文献
11.
将标准平面结晶体P1迭代公式中的自变量x,y用x3+c1,y3+c2替换,构造可视化平面动力系统.将原有的自变量的线性关系替换为自变量的非线性关系,提出了一种新的自变量的映射方法.并且运用蒙特卡罗搜索法寻找参数,运用李雅普诺夫指数来确定该动力系统的特性,绘制出该动力学系统的混沌吸引子和充满Julia集的图案。 相似文献
12.
13.
模糊理论是为了解决真实世界中普遍存在的模糊现象而发展的一门学问，模糊理论以模糊集合为基础，基本精神是接受模糊性现象存在的事实，而以处理概念模糊不确定的事物为其研究目标，并积极地将其严密量化成计算机可以处理的信息。本文首先简介模糊理论，而后将模糊理论在信息检索上的应用做一探讨，希望通过本文，使大学对模糊理论有更深入的了解，并且思考如何将之更广泛地应用于图书信息学上。 相似文献
14.
教师的教学质量评价是学校教学管理的重要环节和内容,在教学质量评价信息的收集过程中,一方面受评价者本身专业背景与调查时间等主客观原因所限,其所提供的教学质量评价信息极有可能出现不完整现象;另一方面在对评价信息进行集结的过程中,常选用的线性加权求和法所默认的评价因素之间相互独立的条件亦很难满足,针对上述情况,本文选用直觉模糊集的方法对教学质量进行评价,算例表明依据直觉模糊集的相关理论对教学质量进行评价,在保证了较强的实用性的同时,能处理评价信息不完整的情况,最大限度利用已有评价信息,使测评结果更加全面、科学、合理。 相似文献
15.
提出一个新的具有积压定单的关于模糊订购量、模糊存储量及模糊总需求的模糊存储模型。在模糊函数原理下,给出了模糊总存储成本。为了寻找最优解,使用积分均值法白化模糊总存储成本,利用Lingo8.0求解不等式约束问题,我们发现最优解都是确定的实数。此外,当模糊订购量和模糊总需求及模糊存储量都是确定的实数时,我们提出模型的最优解与经典的具有积压定单存储模型具有相同的结果。 相似文献
16.
A new concept of a bipolar query against collections of textual documents, i.e. in the context of information retrieval (IR), is introduced using recent developments in bipolar information modeling and bipolar database queries. Specifically, a particular approach to bipolar queries with an explicit “and possibly” type of an aggregation operator is used. An effective and efficient processing of such bipolar queries using standard IR data structures is briefly discussed. The bipolar queries proposed combine a flexibility provided by fuzzy logic with a more sophisticated representation of user preferences and intentions. This combination can make the search of vast resources of textual document, notably those available via the Internet, more intelligent. 相似文献
17.
Birgit Verworn 《Research Policy》2009,38(10):1571-1581
In this study of new product development projects, the fuzzy front end of innovation was explored. The new product development process has multiple stages, so two types of fuzzy front end impacts on the success of new product development were examined: (1) a direct impact and (2) an indirect impact by influencing the next stage of the new product development process, i.e. project execution. Furthermore, the degree of project newness, in accordance with contingency theory, was considered.We developed and tested a conceptual model of relationships among key variables related to the fuzzy front end, project execution, and project success. The structural equation model was tested with AMOS using information from 144 projects completed by German measurement and control technique firms.For the most part, the responses from these firms supported the hypothesized relationships and the frequently claimed importance of the fuzzy front end was confirmed. The results offer strong support for the importance of the early involvement of all departments in new product development to enhance communication and, ultimately, project success. This process can be advanced by initial planning prior to development.Furthermore, the firms’ responses highlighted the importance of reducing market and technical uncertainty during the fuzzy front end, as both were found to negatively influence communication and increase deviations during project execution. The technical uncertainty remaining at the start of a project had a direct, negative influence on project efficiency and the most far-reaching implications regarding the success or failure of the project.With regard to contingency theory, the results indicated that efforts spent on the reduction of uncertainty to improve project execution and success may be influenced by the degree of newness of new product concepts. The degree of newness was found to influence the reduction of technical uncertainty, deviations from specifications, and efficiency. 相似文献
18.
基于模糊理论,提出以百分比填答的模糊语义表,采用模糊语义算法,构建科研项目立项评估模型。构建过程先由回收的电子打分表,取模糊值大于模糊中位数的有效值,并提取出评估科研项目的主指标、次指标,建立科研项目评估表,供评审委员会主任、副主任、专家总体组长进行评估。由评审专家按照科研项目评估表给予各准则的权重,并根据此准则进行科研项目评分,采用模糊集方式表达,将各抽象的准则转为量化的三角模糊数,对模糊数进行排序评估。最后进行案例评估分析,对构建的模型进行验证,结果表明具有良好的优越性,为科学、客观、公正的评估和优选科研项目立项提供了一种更加可行的方法。 相似文献
19.
Valiollah Tahani 《Information processing & management》1977,13(5):289-303
This paper is concerned with techniques for fuzzy query processing in a database system. By a fuzzy query we mean a query which uses imprecise or fuzzy predicates (e.g. AGE = “VERY YOUNG”, SALARY = “MORE OR LESS HIGH”, YEAR-OF-EMPLOYMENT = “RECENT”, SALARY ? 20,000, etc.). As a basis for fuzzy query processing, a fuzzy retrieval system based on the theory of fuzzy sets and linguistic variables is introduced. In our system model, the first step in processing fuzzy queries consists of assigning meaning to fuzzy terms (linguistic values), of a term-set, used for the formulation of a query. The meaning of a fuzzy term is defined as a fuzzy set in a universe of discourse which contains the numerical values of a domain of a relation in the system database.The fuzzy retrieval system developed is a high level model for the techniques which may be used in a database system. The feasibility of implementing such techniques in a real environment is studied. Specifically, within this context, techniques for processing simple fuzzy queries expressed in the relational query language SEQUEL are introduced. 相似文献