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Search Results: 1 - 10 of 9636 matches for " Fuzzy域 "
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福州大学学报(自然科学版) , 1996,
Abstract: 先讨论Fuzzy环中Fuzzy理想的一些基本性质,然后用Fuzzy理想给出Fuzzy除环与Fuzzy域的几个等价刻划.
华侨大学学报(自然科学版) , 1992, DOI: 10.11830/ISSN.1000-5013.1992.03.0424
Abstract: 本文利用变域Fuzzy集来表示可能性分布-模糊关系模型,并对由此产生的若干模型构成的数据库进行讨论。
科学通报 , 1997,
Abstract: 关于格拓扑学中的一致结构与度量理论已有许多引人注目且有创造性的工作(如文献[1~6]及文献[4]中的相应文献)但它们多是Hutton与Erceg无点派工作的继续和推广,不能直接反映格上点式拓扑的特点.本文的目的就是在Fuzzy格上建立一种点式一致结构与点式度量理论.
Normality and Its Variants on Fuzzy Isotone Spaces  [PDF]
Stephen M. Gathigi, Moses N. Gichuki, Paul A. Otieno, Hezron S. Were
Advances in Pure Mathematics (APM) , 2013, DOI: 10.4236/apm.2013.37084

The study of fuzzy sets is specifically designed to mathematically represent uncertainty and vagueness by assigning values of membership to objects that belong to a particular set. This notion has been broadly extended to other areas of topology where various topological concepts have been shown to hold on fuzzy topology. Some notions naturally extend to closure spaces without requiring a lot of modification of the underlying topological ideas. This work investigates the variants of normality on fuzzy isotone spaces.

A fuzzy Lyapunov approach for constrained T-S fuzzy systems design

LUO Yan-bin,JIANG Xie-fu,ZHONG Wei-min,

控制理论与应用 , 2010,
Abstract: A class of discrete-time T-S fuzzy systems subject to input saturation is studied by introducing a fuzzy Lyapunov function. A sufficient condition that ensures the stability at the system origin is derived; and the domain of attraction may be enlarged by applying a fuzzy anti-windup compensator to the considered system. This method avoids the difficulty in seeking a common positive-definite matrix P satisfying all fuzzy rules of this system. Moreover, an iterative optimization algorithm for obtaining the anti-windup compensator gain is given.
- , 2016, DOI: 10.12068/j.issn.1005-3026.2016.09.010
Abstract: 摘要 为了实现语义Web中模糊时空知识的表示与推理,提出了一种支持模糊时空具体域的模糊描述逻辑F-ALCT(Dfst).首先,构建了包含模糊时空区域及其时空拓扑谓词的模糊时空具体域Dfst,给出了两个模糊时空区域之间的拓扑关系模糊度的计算方法.然后,将Dfst和时态操作符引入到模糊描述逻辑Fuzzy-ALC中,构建出一种新的模糊描述逻辑F-ALCT(Dfst),并定义了其语法、语义和知识库.最后,给出了一个F-ALCT(Dfst)的知识库实例.F-ALCT(Dfst)有效地实现了语义Web中模糊时空知识的表示.
Abstract:In order to achieve representation and reasoning of fuzzy spatio-temporal knowledge in semantic Web, a fuzzy description logic F-ALCT(Dfst) supporting fuzzy spatio-temporal concrete domain was proposed. Firstly, a fuzzy spatio-temporal concrete domain D○fst containing fuzzy spatio-temporal regions and their topological predicates was constructed. And the quantitative computation method of fuzzy topological relationships between fuzzy spatio-temporal regions was presented. Then, the concrete domain D○fst and temporal operators were introduced to fuzzy description logic Fuzzy-ALC, and a new fuzzy spatio-temporal description logic, called F-ALCT(Dfst), was proposed. Furthermore, a formal definition of syntax, semantics and knowledge base of the F-ALCT(Dfst) was presented. Finally, an example of F-ALCT(Dfst) knowledge base was given. The F-ALCT(Dfst) effectively realizes the representation of fuzzy spatio-temporal knowledge in semantic Web.
Research of MAC Protocol for Wireless Medical Body Area Network Based on Fuzzy Logical Algorithm

LU Xian-ling,PENG Neng-ming,XU Bao-guo,

计算机科学 , 2013,
Abstract: 针对无线医疗体域网的能量受限问题,提出了一种利用模糊逻辑控制理论来减少单个节点射频装置工作频次的MAC协议——FL-MAC。该协议通过模糊逻辑算法过滤掉网络中需要发送的正常生理信息,减少数据流量,保证时隙的引入,确保对突发事件的及时处理。仿真结果表明,该协议相比于ASCEMAC和DQBAN-MAC等模糊逻辑协议,延长了网络节点的生命周期,降低了整个网络的时延。
Two attribute reduction algorithms based on fuzzy-rough set


计算机应用 , 2006,
Abstract: Fuzzy-rough set treats membership values in fuzzy sets as attribute values in rough set theory , which describes the possible degrees and the certain degrees of fuzzy events. Two attribute reduction algorithms based on fuzzy-rough set, FRSAR and CCD-FRSAR were analyzed and compared in computational complexity and convergency. The conclusion is validated by concrete experiments: as a whole, CCD-FRSAR is better than FRSAR.
LQ fuzzy control of T-S discrete fuzzy systems with actuator saturation

LIU Bo,JIA Xin-chun,GAO Yi-bo,

控制理论与应用 , 2007,
Abstract: The linear quadratic(LQ)fuzzy control problem for Takagi-Sugeno(T-S)discrete fuzzy systems with actuator saturation is studied in this paper.Firstly,by Lyapunov stability theory,parallel distributed compensation(PDC)technique, and linear matrix inequality(LMI)approach,a sufficient condition of asymptotic stability of the closed-loop fuzzy systems is obtained.Secondly,the design method of LQ fuzzy controllers and an estimate of domain of attraction for such systems are presented,and a computing formula of an upper-bound of the LQ performance cost function is also established.Fur- thermore,for two kinds of optimization problems,i.e.,minimization of LQ performance and maximization of domain of attraction,two computing methods with LMI constraints are presented.Finally,a numerical example is given to illustrate the effectiveness of the proposed method.
A New Bandwidth Interval Based Forecasting Method for Enrollments Using Fuzzy Time Series  [PDF]
Hemant Kumar Pathak, Prachi Singh
Applied Mathematics (AM) , 2011, DOI: 10.4236/am.2011.24065
Abstract: In this paper, we introduce the concept of (4/3)? bandwidth interval based forecasting. The historical enrollments of the university of Alabama are used to illustrate the proposed method. In this paper we use the new simplified technique to find the fuzzy logical relations.
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