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1.
本文首先证明了在O型模糊集的交、并运算分别是三角模和三角余模的前提之下,合理的有意义的交、并算子分别为∧和∨.在此基础上,我们讨论了利用O型模糊关系进行模糊聚类的意义及可行性。  相似文献   

2.
基于直觉模糊等价关系的聚类算法   总被引:2,自引:0,他引:2  
首先引入直觉模糊集的模运算、直觉模糊集之间的关系及合成运算的定义,然后提出了直觉模糊集的截集定义,揭示了利用直觉模糊等价关系的分类原理,并讨论了基于直觉模糊等价关系的模糊聚类算法,从而使直觉模糊集的基本理论得到进一步扩展。最后给出了该算法的一个数值实例。  相似文献   

3.
首先提出了具有模糊逻辑计算功能的模糊Hopfield神经网络-FHN.FHN中的神经元对应于模式集合的元素,权重矩阵对应于模式之间的模糊关系,最后讨论了FHN的稳定性和基于模糊距离关系的模糊聚类功能,研究表明FHN在模糊模式识别中具有广泛的应用性。  相似文献   

4.
Vague关系作为模糊关系的一种推广,具有比模糊关系更强大的模糊信息表达能力.基于Vague集理论,系统研究了Vague关系及其合成运算.引入了Vague集及范数的相关知识,给出了Vague集之间一般关系、逆关系、空关系、恒等关系的定义,研究了它们进行关系运算的性质及相关定理,且给出了必要的证明.在此基础上,对基于范数的max-t&min-sVague关系合成运算进行了研究,并给出了相应的定理和证明,进而讨论了其在Vague近似关系缺失值填补方面的应用.  相似文献   

5.
基于模糊粗糙集理论的建筑业综合评价   总被引:2,自引:0,他引:2  
根据模糊聚类和粗糙集理论的基本原理,利用模糊聚类的相似关系与粗糙集可辨识矩阵的特性,结合这两种方法的互补优势,研究了将之应用于建筑业综合评价的方法和步骤.通过模糊聚类法形成粗糙集下的决策信息系统,采用基于可辨识矩阵的启发式约简法对属性约简,计算出约简后各属性的权重.利用各属性的权重分别对各省市(或地区)的建筑业指标评价值加权求和从而得出各自的建筑业综合评价值,对其结果的客观性和实用性所进行的分析评价证明该方法有效.  相似文献   

6.
模糊关系与模糊关系方程   总被引:3,自引:0,他引:3  
利用伪t-模定义模糊关系的Sup-T合成和Inf-I合成,讨论这两种合成的一些性质,进而研究模糊关系方程P  T Q=S和P  I R=S解的结构,这里T是[0, 1]上无穷∨-分配伪t-模,I是[0, 1]上由T诱导无穷∧-分配蕴涵, P和S是已知的模糊关系, Q和R是未知的模糊关系.  相似文献   

7.
基于模糊贴近关系的模糊聚类及其有效性   总被引:2,自引:0,他引:2  
讨论了模糊聚类的两个基本问题:聚类方法和有效性评价,作为通常模糊等价关系聚类方法的扩展,给出了一种用三角算子和模糊贴近关系进行模糊聚类的方法,同时以样本原始信息和聚类结果为基准,提出了一种度量聚类有效性的方法。最后的例子表明该方法是有效的。  相似文献   

8.
分析了模糊关系、模糊关系合成和模糊推理,为便于讨论模糊关系的合成,定义了模糊关系主和从的概念;基于模糊推理的综合评价,将模糊集合看成是模糊关系,将模糊蕴含关系作为模糊单因素评价矩阵并输入模糊推理;最后,通过教师年终考核实例,提出了利用不同职称相对隶属度求得模糊蕴含矩阵的方法.该方法为模糊综合评价的应用提供了参考.  相似文献   

9.
本文在L.A查德提出的模糊集及其基本算子∨、∧、C的基础上引进了模糊矩阵的广义的Fuzzy算子??与??,.与※,??与??,??与??,←与→,△与??等,并讨论了它们的性质及其相互间的关系.这些算子都是合成运算,对于解模糊方程或研究模糊矩阵的进一步应用都是极其重要的运算方法.  相似文献   

10.
在模糊关系的基础上引入了模糊一致关系的概念,进而描述了它的意义、性质与构造方法,给出了模糊一致关系的截集运算和合成运算,得出了一种基于模糊一致关系的决策模型。  相似文献   

11.
Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.  相似文献   

12.
何延凌 《科技信息》2008,(4):258-258
Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women's language from these perspectives: pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women's language, more attention should be paid to language use in social context. What's more, the linguistic phenomena in a speaking community can be understood more thoroughly.  相似文献   

13.
王慧 《科技信息》2008,(10):240-240
Wuthering Heights, Emily Bronte's only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.  相似文献   

14.
The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.  相似文献   

15.
理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。  相似文献   

16.
As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.  相似文献   

17.
Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.  相似文献   

18.
正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-  相似文献   

19.
We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-  相似文献   

20.
正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that  相似文献   

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