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1.
基于模糊感知器的路面性能预测方法   总被引:3,自引:0,他引:3  
利用模糊感知器人工神经元网络尝试建立一个智能型路面性能预测模型,对神经网络原理和模型结构进行了系统的理论分析,给出了详细的算法,并以平整度历年调查资料为数据基础,对该模型进行了实例分析,证明了模型的理论与实际运用的可行性。该方法利用神经网络与模糊方法各自的优点,针对不同性能指标,建立对应的神经网络预测模型,来对今后的指标值进行预测,较好地解决了路面性能预测中的模糊性和不确定性。  相似文献   

2.
混沌模糊交通控制器的设计   总被引:1,自引:0,他引:1  
为了克服传统模糊控制输入难以确定的问题,改善模糊控制器的性能,提出了混沌模糊控制器的设计方法,并给出了仿真实例。介绍了混沌预测的原理,给出了实现混沌预测的算法步骤和模糊控制器的设计方法,将混沌预测的输出结果作为模糊控制器的输入,模糊控制器经过模糊化,模糊推理,解模糊一系列的运算过程,得到的结果再与比例因子相乘,得到信号灯的相位时间,仿真结果表明:混沌模糊控制器比传统的模糊控制器性能得到很大的改善。其中,平均停车次数减少30%,平均车速提高18%,车辆平均延误时间减少40%。  相似文献   

3.
应用模糊数学处理复杂的教育信息不仅可行,而且必要。为此利用教育评价的理论和模糊综合评判的原理,结合实例,探讨了单级模糊综合评判的方法在教育评价中的应用,介绍了教育信息处理的技术与方法,设计了相应的数据结构和算法,给出了教育评价系统的软件实现技术,并对结果进行了分析。  相似文献   

4.
交通流量预测是智能交通系统技术应用的重要组成部分.为提高预测水平,引进基于区间二型模糊神经网络的交通流量时间序列预测模型,给出了基于二型模糊神经网络的仿真算法.并结合广州市某高速公路为例对交通流量进行预测,对比计算了该方法与一型模糊神经网络预测方法的预测结果,仿真表明该系统具有精确性和高可信度,预测准确性明显高于传统的一型模糊神经系统.  相似文献   

5.
改进的相似优先比模型在浦东新区电力负荷预测中的应用   总被引:2,自引:0,他引:2  
改进优先比方案是将模糊理论中的相似优先比运用于负荷预测后发现原基本模型的某些不足之处而进一步提出的模型,主要吸收了模糊理论中综合评判思想,采用了多因素 归预测,充分考虑电力负荷受多因素作用的客观实际,同时还根据预测对象不同,对模型进行修改,给出相应的满意度。  相似文献   

6.
基于二型模糊逻辑的交通流量预测   总被引:1,自引:0,他引:1  
提出了一种改进的模糊c均值聚类算法,该算法将模糊聚类的对象从单值扩展到区间,在构造二型模糊系统时,通过对历史数据的学习提取二型模糊规则,克服了专家方法不能对未知领域提取规则的不足.在此基础上,针对智能交通系统,提出一种新的基于二型模糊逻辑的交通流量预测方法.该方法应用区间型二型模糊集具有上下限隶属度函数的性质构造预测区间,适合于处理具有复杂不确定性的情况.通过隶属度函数可以反映出该区间中预测值的可靠性,从而克服了其他预测方法仅给出单值且稳定性不高的缺点.仿真结果表明,基于二型模糊逻辑的流量预测区间具有较高的准确度,其平均相对误差低于6%.  相似文献   

7.
模糊分析中的结构元方法(Ⅰ)   总被引:36,自引:12,他引:36  
模糊数和模糊值函数是模糊分析中的最基本概念,在模糊分析中模糊数与模糊值函数的运算通常都是基于扩张原理的形式给出的,而模糊值函数的微分和积分也都是基于区间值函数的相应结构利用表现定理形式给出的,它们的共同特点都是对元素遍历某个条件所对应的全体结果进行运算,或取λ遍历[0,1]所对应的全体结果的并运算,这种运算中的遍历过程给模糊分析理论的应用带来了极大的不便,使得操作无法进行。因此,需要寻找模糊数和模糊值函运算的其它有效的表达方式,本文提出了模糊结构元的概念,并研究了模糊结构元的性质,给出了模糊数的结构元表现定理,利用模糊数的结构元表现形式可以使模糊数的运算变成普通实数与模糊结构元之间的运算,使得过去必须领带扩原理和表现定理来刻画的模糊数运算变得更加简单与直观,模糊结构元理论与技术不仅为模糊分析计算的简化提供了工具,同时也为模糊分析理论与应用的开创了一条新的途径。  相似文献   

8.
电力系统中长期负荷预测的模糊算法   总被引:6,自引:0,他引:6  
介绍了用模糊指数平滑法和模糊线性回归法进行电力系统中长期负荷预测的方法,以实际预测为例,给出预测结果,实践证明了上述2种方法虽然以传统预测方法为基础,但具有算法简单,计算速度快,预测精度高,预测误差小,并能提供负荷的一个预测区间等优点,尤其在原始数据存在不确定性和模糊性时,更有着常规预测方法无可比拟的优越性。  相似文献   

9.
模糊线性回归预测   总被引:10,自引:0,他引:10  
为了解决带有模糊信息的动态预测问题,在已有的线性回归预测法的基础上,提出了模糊线性回归预测的模型。模型的确定在于模糊系数的确定,模糊系数为对称三角模糊数,为此给出了描述对称三角模糊数近似和蔼的拟合度的定义及其表达式。借助于对称三角模糊数以截集表示的一对函数,给出了对称模糊的模糊度的定义及其表达式,给出了确定模糊系数的准则:对于事先指定的标准拟合度,要求在每个方程估计值的拟合度都不小于标准拟合度的约  相似文献   

10.
电法找水工作中,对井的涌水量进行预测一直是难题。介绍了利用电测深曲线上升段长度、最大电阻率及电阻率的变化率与含水层富水性之间的关系。采用模糊综合评判法与模糊统计,建立模糊综合关系模型,预测井的涌水量,并在王府台地电测找水中应用,获得了满意的成果。  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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