旅游上市公司财务风险评价的可变模糊改进方法

为克服旅游上市公司财务风险评价方法的不足,提出可变模糊改进方法.首先,基于集对模糊联系度,构造相对隶属度矩阵,进而建立可变模糊综合评价模型;然后,结合评价等级特征值,运用二元语义方法确定评价等级和阈值;最后,将方法应用于旅游上市公司财务风险评价问题.结果表明:旅游上市公司财务风险等级为Ⅱ级,即风险较低,且通过计算可发现收现能力和成长能力是影响其风险等级的主要因素,是旅游上市公司财务风险管理的重点.     

集对分析在软件测试综合效能评估中的应用研究

在介绍集对分析法的思想和方法后,建立了软件测试综合效能评价体系和评价模型.以此为基础,通过求解对象综合联系度,以及设定评判集和联系度判别准则,对软件测试效能进行综合评估,确定软件测试综合效能所属等级,为软件企业改善测试过程及质量提供定量依据.     

基于云模型的地下商城火灾防范能力评估

将逆向云发生器与一维前件云发生器综合集成,比对待评估地下商城与地下工程"火灾防范能力数据库"各项指标之间的确定度,并利用Matlab云发生器工具箱对各个等级的确定度进行大量随机计算,通过比较各个等级的中值与均值,判断待评估地下商城的火灾防范能力等级.结论表明,综合云发生器不仅可以客观全面的保留原始评价信息,而且评价结果更加立体直观.     

基于Hausdorff距离的区间数多属性公路网综合评价

公路网评价对于了解区域公路网状态和交通需求间的关系非常重要.讨论了公路网属性表示为区间数的问题,通过计算属性值相对于属性等级的距离矩阵得到相应的加权可变相似度,再对可变相似度进行归一化处理,作为各属性等级的权重向量,同时应用级别特征公式求得综合属性值进行综合评价.实例表明,该方法和其他方法的评价结果一致,且能给出不同标准下的评价结果,计算过程简明且有效,而且能向属性值为其他类型的不确定量进行拓广.     

基于集对分析的路面使用性能评价方法

针对路面状况评价指标的不确定性,将集对分析理论应用于沥青路面状况评价过程.通过延伸的同一、差异、对立的集对分析概念,评价、判断路段路面状况的等级.方法避免了路面状况综合评估中的不确定因素的影响,进行合理的路面结构类型评价,将方法应用于路面结构选择的工程实例,取得较为满意的结果.     

甘肃省物流业与经济发展的协调性评价分析

介绍了甘肃省物流业的实际状况,其次建立了甘肃省经济发展和甘肃省物流业发展的二级评价指标体系,运用基于方差加权法与熵值法相结合的综合赋权法的非线性评价模型分别对甘肃省经济发展的综合实力和物流业发展的综合实力进行评价.最后基于回归和隶属度函数相结合的方法,运用物流业和经济发展的综合实力评价结果分析计算甘肃省物流系统与经济系统的协调测度,根据计算的测度绘制散点图,对甘肃省物流系统与经济系统的协调度进行分析评价.     

属性等级和属性值均为区间数的多属性决策集对分析

针对属性等级和属性值都是区间数的不确定型多属性决策问题,通过把区间数转化为集对分析联系数,计算联系数的模以及属性等级模与属性值模的同一度,再利用这些同一度并参照属性等级数n建立n元联系数,利用n元联系数综合值做出决策.实例运算表明,此方法简明,而且便于对决策方案的排序作不确定性分析.     

软土地基建筑稳定性模糊综合评价方法研究

软土地基具有高压缩比、低力学性能、较强塑性,不利于上部建筑工程稳定.施工前,对现状条件下建筑的稳定性进行预判,并根据评判结果提出相应的地基处理方案,对工程的安全实施很有必要.基于软基建筑稳定性受多种因素控制,具有一定的模糊性,提出采用模糊综合评价方法.首先通过技术和工程资料分析,建立了有8个主要影响因素组成的评价因子集合,并给出了合理的隶属度.然后运用层次分析方法得到了各因素的比较评判矩阵,并计算得到了权重集.在此基础上,建立了软基建筑稳定性分级与综合评价指数的对应关系集.最后,将方法运用到某软土建筑稳定性评价中,结果表明方法能够较好地适用于软土基地建筑稳定性评价,但需进一步就隶属度、权重、评价集等集合的建立进行完善.     

可变模糊集理论在江西省水资源承载力评价中的应用

结合江西省2009年自然、社会和经济以及水资源资料,选取降水量、灌溉率、水资源开发利用程度、生活用水定额、人均供水量、万元GDP用水量、生态环境用水率、缺水率作为评价指标,应用可变模糊评价模型对江西省11个市的水资源承载力进行了评价研究.能够科学、合理地确定样本指标对各级指标标准区间的相对隶属度、相对隶属函数,并且能够通过变化模型及其参数,合理地确定出样本的评价等级,提高对样本等级评价的可信度.最后与模糊识别理论计算出的结果进行比较,评价等级基本保持一致.研究结果表明,江西省整体水资源承载力等级为1~2级,水资源开发利用已具有一定规模,部分区域水资源开发潜力较大.     

水电工程应急能力模糊可变评估方法研究

针对水电工程应急能力评估的问题,综合运用可变模糊集理论,提出水电工程应急能力模糊可变评价方法.首先,通过分析水电工程应急能力构成要素,构建应急培训、应急预案与演练、危险源辨识与排查、应急保障体系、监测预警、现场处置等六类评价指标;其次,通过定义应急能力等级评价的模糊可变问题,分别计算样本指标对标准区间的级别相对隶属度和综合相对隶属度,构建应急能力模糊可变评价模型;然后,采用可变模糊迭代方法确定客观权向量,融合决策者的经验和主观偏好,调整评价权重.最后,以溪洛渡工程为例,表明方法综合使用主客观权重,提高了评价的可靠性与科学性.     

Reduction of seismic vibration in multistorey structures retrofitted with nonlinear viscous dampers using mode summation method

Viscous dampers are the retrofitted devices used to reduce the vibration energy in mechanical systems. In the present paper an investigation is carried to see the effect of nonlinear viscous dampers (NVDs) in multistory buildings. A model of building consisting of NVDs in each floor is considered and is subjected to base shear excitation. The complete model is considered as an equivalent mechanical system and equation of motion is established for equilibrium condition. Using mode summation method analytical expressions are found for the displacement response of the building's floors due to shear waves. To see the role of NVDs different values of damping coefficients are considered and the result is compared with the response of building without NVDs. Analyzing the result it is found that NVDs present in the building's floors dissipate the vibration energy significantly.     

Characterizations by Automorphism Groups of Some Rank 3 Buildings, III. Moufang-Like Conditions

In this paper, we introduce the root-Moufang condition and the p-adic Moufang condition. We show that affine buildings of type Ã2 satisfying the root-Moufang condition are Bruhat–Tits buildings. Also, every rank 3 affine building satisfying the p-adic Moufang condition is a Bruhat-Tits building. We motivate the introduction of the new conditions by showing that all Bruhat– Tits Ã2-buildings satisfy the root-Moufang condition, and that the Ã2-buildings over a p-adic field also satisfy the p-adic Moufang condition. Another application of the p-adic Moufang condition is given in Part IV of this paper.     

On the X-Y convex hull of a set of X-Y polygons

We study the class of rectilinear polygons, calledX – Y polygons, with horizontal and vertical edges, which are frequently used as building blocks for very large-scale integrated (VLSI) circuit layout and wiring. In the paper we introduce the notion of convexity within the class ofX – Y polygons and present efficient algorithms for computing theX – Y convex hulls of anX – Y polygon and of a set ofX – Y polygons under various conditions. Unlike convex hulls in the Euclidean plane, theX – Y convex hull of a set ofX – Y polygons may not exist. The condition under which theX – Y convex hull exists is given and an algorithm for testing if the given set ofX – Y polygons satisfies the condition is also presented.     

建材中VOCs扩散系数和分配系数的模型研究

Bodala,运用静态双仓法建立的测定干建材中VOCs扩散系数和分配系数的数学模型是合理的,有一定的应用价值.但该模型假设低浓度仓中VOCs的初始浓度为零,限制了模型的应用范围.针对使用VOCs液体为污染源且建材透气性较好的条件,作出合理的假设,构建了VOCs在建材中扩散的数学模型.采用LaplaceCarson变换详细求解模型,得出计算VOCs扩散系数的方法,并运用两组数据对模型进行了比较分析,结果表明优化后的模型有一定的实用性和可行性.     

A New Decomposition Approach for Non-Cyclic Continuous Material Flow Lines with a Merging Flow of Material

We extend the decomposition approaches for flow lines with unreliable machines and limited buffer capacity as proposed by Gershwin and refined by Dallery, David, and Xie and by Burman by incorporating a new building block in the decomposition. This new building block is a three-machine, one buffer system which models a merging flow of material. While previous decomposition approaches led to a decomposition of the original network into virtual two-machine lines, we now use both virtual two- and three-machine lines. This requires a new set of decomposition equations for the virtual machines of the two-machine lines that surround the new building block modelling the merge. We present these equations, show how to solve them in an algorithm and present numerical results for non-cyclic networks in order to determine production rate and inventory level estimates.     

On a geometrical construction of the multipler rule

In this paper we make a contribution to the theory of necessary conditions for optimization problems. Tikhomirov has given in [T] a unified necessary condition for mixed (smooth-convex) problems. In this paper we develop the smooth case, one of the two building blocks. We offer a new, geometrical construction giving a necessary condition under minimal assumptions.     

基于KMV模型的农业上市公司信用风险测度研究

通过构建改进后的KMV模型,设定三种不同违约情境,对2010-2012年我国农业上市公司的信用风险进行测度与比较研究,并确定其隶属的风险类型,以揭示现阶段农业上市公司的信用状况.研究结果表明:不同农业上市公司的资产价值均高于股权价值,其未来发展具有较好的价值增值空间;农业上市公司的资产价值波动率总体呈下降趋势;农业上市公司信用状况相对较差,且风险类型主要集中于"∩"型和↘型".由此得出农业上市公司未来的发展,应在推进"股权分置"改革、建立可量化的风险管理机制、实现风险管理与业务流程融合等方面采取措施,从而有效降低我国农业上市公司的信用风险.     

A representation of the chamber set Hecke algebra of an affine building

We define a representation of the chamber set Hecke algebra of an affine building. This representation allows to extend to every affine buildings of rank 3 the Kato’s condition for the bijectivity of the Poisson transform.     

Numerical study of bifurcation blood flows using three different non-Newtonian constitutive models

In this work, a variational multiscale finite element formulation is used to study bifurcation flows of non-Newtonian fluids, using a representative simplified Carotid Artery geometry. In particular, the flow pattern and wall shear stress (WSS) computed using power-law, Cross, and Carreau–Yasuda models, are assessed. First, the formulation is validated by contrasting simulations of a benchmark test for bifurcation flows reported in the literature. After that, a study of blood flow through the carotid artery is presented. Hemodynamics conditions aimed to describe the flow behavior from diastole to systole of the cardiac cycle for healthy arteries and two specific conditions (60% carotid stenosis due to atherosclerosis and 20% increased bifurcation angle due to aging), are specifically analyzed. For each condition, the hemodynamics present different velocity fields that lead to distinctive distribution of WSS enable us to classified three regions, depending on their magnitude: low-WSS, medium-WSS and high-WSS. Results show that power-law flows predict lower wall shear stresses, especially in sections where geometry concentrates stresses, compared to those predicted using Cross and Carreau–Yasuda models. Overall, low-WSS are usually present in zones where stenosis develops even in healthy arteries, however, both geometries lead to a decrease of WSS magnitude in low-WSS regions, increasing the risk factor associated with plaque building.