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1.
绝缘子状态评估中指标信息兼具模糊、随机和灰色性特点。针对当前评估方法较少考虑到参量因素灰色性的问题,基于贝叶斯修正IFAHP法并结合灰色模糊理论和灰云模型提出一种绝缘子污秽状态的灰色模糊综合评判模型。该模型首次引入IFAHP和直觉模糊熵理论以更为科学合理地确定评判因素权重集,并基于贝叶斯公式建立主观权重的优化模型以实现指标的二阶段赋权;同时,利用灰云模型求得评判指标对应各状态等级的关联度并作为评判矩阵模部,再以灰部兼顾评判信息的灰性,进而对建立的评判矩阵综合处理。实例对比表明,贝叶斯修正IFAHP法确定的权重集更为合理适用,基于灰色模糊评判的结果也更贴近实际情况。  相似文献   

2.
针对主客观混合评价信息的供应商选择决策问题,提出一种基于直觉模糊交叉熵及灰色关联的群决策方法。在确定供应商选择决策指标体系的基础上,将不同类型的主观评价信息统一转化为直觉模糊数,基于新的得分函数及单个决策者与决策群体的评价偏差确定决策者权重。把转化为直觉模糊数的规范化客观评价信息与群体直觉模糊主观评价信息合并,并采用直觉模糊熵确定各属性权重。根据直觉模糊数之间的交叉熵距离度量,采用灰关联法实现对备选供应商的排序择优。制造类企业供应商选择算例表明所给方法的合理有效性。  相似文献   

3.
选取速度和占有率评价指标,建立基于熵权法和灰色关联分析的快速路交通状态模糊判断模型。模糊综合评价的权重由熵权法和灰色关联分析组合分析得到,最终通过计算得到交通状态的量化结果。结合实例分析可知,方法可行且有效,与基于单一速度或占有率的方法相比,具有较好的稳定性,能够为城市快速路交通状态判别提供理论依据。  相似文献   

4.
针对评价指标标准值与评分值为模糊数的综合评估问题,将模糊数引入灰关联综合评估领域,提出了一种基于模糊数平面距离的多指标多层次灰关联综合评估方法.为了评估现场扣件式钢管支模架的施工风险,设计了一套多指标多层次的扣件式钢管支模架的施工风险评估系统.通过10个工程的问卷调查,确定了系统各评价指标的权重和评分值.借助于该评估方法,建立了扣件式钢管支模架施工风险评估体系.最后实例分析表明该方法和评估系统的正确性和有效性.  相似文献   

5.
针对装备方案论证阶段技术风险发生概率、后果影响程度与技术风险大小间的关系,基于相对熵原理计算技术风险各评价指标的主观权重与客观权重的组合权重,采用投影法构建技术风险评价模型.实例计算结果表明:技术风险评价模型初步解决了模糊综合评价或灰评价模型所存在的区分性不强、评价结论有片面性、依赖较多的历史经验数据等问题,得到了评价方案集中各方案的技术风险发生概率、后果影响程度及技术风险的排序,计算过程与符合技术风险的内涵要求一致,为装备研制方案的科学决策提供理论依据.  相似文献   

6.
基于模糊层次熵多目标评价决策模型的物流服务商优选   总被引:2,自引:1,他引:1  
首先利用模糊层次分析法决定指标的模糊权重,利用决策矩阵提供的信息,进一步用多目标决策中的熵技术修正决策者先前决定的优先权重,再利用模糊综合评判确定最优方案.提出的这种基于模糊层次熵多目标评价决策模型,兼顾主观偏好和客观实际,应用于解决物流服务商优选问题,表明了该方法的合理性与有效性.  相似文献   

7.
徐勇 《科技资讯》2009,(32):141-142
针对企业能效综合评价中涉及大量的不确定因素和信息不完全的问题,提出基于灰色关联分析的评价方法,建立了一个基于熵权的灰色关联模型。通过采用熵权对企业能效各评价指标赋权,提高了权重的准确度和可信度。最后通过实例验证了该模型是有效的和可性的。  相似文献   

8.
为了对机场陆侧客运交通内部衔接效率进行综合评价,提出了一种基于混合熵权的模糊综合评价法。首先从转换方便性、设施布局合理性和衔接协调性三个方面,建立了机场陆侧客运交通内部衔接效率的评价指标体系,并介绍了各指标的定义及计算方法。然后采用模糊AHP与熵权修正各指标的权重,结合传统的模糊综合评判法,对机场陆侧客运交通衔接系统进行了评价。最后通过算例分析,得出了机场陆侧客运交通内部衔接效率3种方案的评价等级。研究结果表明,算法和模型合理有效。  相似文献   

9.
为了综合考虑监理服务质量评价的模糊性与灰性,文章将监理服务质量评价体系分为5个1级指标和22个2级指标,运用层次分析法合理地确定出各指标的权重;运用灰色理论确定各指标的灰数及灰色评价权,形成灰色模糊权矩阵,进而得到灰色模糊综合评价矩阵,计算被评价对象的评分;该方法可用于评价不同项目监理服务质量的优劣.  相似文献   

10.
针对备选方案的属性值为区间梯形直觉模糊数(IVITFN)且方案属性指标和决策者权重未知的多属性群决策(MAGDM)问题,提出了一种基于熵权的区间梯形直觉模糊数型多准则妥协解排序(VIKOR)方法。首先,将决策者的评价信息转化为IVITFN决策矩阵,并对其进行规范化处理;其次,利用区间梯形直觉模糊Bonferroni平均(IVITFBM)算子将多个决策者的决策矩阵集结为一个综合决策矩阵;然后,利用熵权法求出综合决策矩阵中各属性指标的权重,并基于VIKOR方法对备选方案进行排序以及决策分析;最后,通过实例和比较分析验证了该方法的有效性和可行性。  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.
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   

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 discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3~4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰~ -7.8‰, PDB) and matrix dolomites (-6.6‰~ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084~0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078~0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.  相似文献   

15.
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   

16.
以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.  相似文献   

17.
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   

18.
Quality traits in wheat (Triticum aestirum L.) were studied by quantitative trait locus (QTL) analysis in a recombinant inbred line (RIL) population, a set of 131 lines derived from Chuan 35050 × Shannong 483 cross (ChSh). Grains from RILs were assayed for 21 quality traits related to protein and starch. A total of 35 putative QTLs for 19 traits with a single QTL explaining 7.99-40.52% of phenotypic variations were detected on 10 chromosomes, 1D, 2A, 2D, 3B, 3D, 5A, 6A, 6B, 6D, and 7B. The additive effects of 30 QTLs were positive, contributed by Chuan 35050, the remaining 5 QTLs were negative with the additive effect contributed by Shannong 483. For protein traits, 15 QTLs were obtained and most of them were located on chromosomes 1 D, 3B and 6D, while 20 QTLs for starch traits were detected and most of them were located on chromosomes 3D, 6B and 7B. Only 7 QTLs for protein and starch traits were co-located in three regions on chromosomes 1D, 2A and 2D. These protein and starch trait QTLs showed a distinct distribution pattern in certain regions and chromosomes. Twenty-two QTLs were clustered in 6 regions of 5 chromosomes. Two QTL clusters for protein traits were located on chromosomes 1D and 3B, respectively, three clusters for starch traits on chromosomes 3D, 6B and 7B, and one cluster including protein and starch traits on chromosome 1D.  相似文献   

19.
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   

20.
赵英华 《科技信息》2008,(12):219-220
0.Preface China has long been boasting of its colorful and immense culture which comprises of Taoism,Confucianism and Buddhism.The interwoven influence among the religions on Chinese way of thinking,on the nation's behavior in their social life throughout the long history is beyond list.  相似文献   

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