基于比例优势模型的上市公司财务困境预测研究

在激烈的市场竞争中,现代企业非常关注风险管理,注重防范与控制风险,而风险管理的关键是预测与控制财务风险。生存分析模型能动态地预测风险事件发生的概率,本文精比例优势模型应用干我国上市公司财务困境预测,根据边际似然与ALASSO变量选择程序,确定了影响财务风险的主要因素,获得模型参数估计,考察了比例优势模型财务困境预测判断能力,比较了Cox模型和比例优势模型这两种生存模型的财务风险预测效果。结果表明,比例优势模型能展现企业财务困境的发展过程,具有较好的财务困境预测能力。     

上市公司财务预警的BP神经网络模型的建立及其应用

将BP神经网络方法应用于上市公司的财务预警上,构建了上市公司财务预警模型,不仅能发现企业是否存在风险和企业经营是否偏离轨道,向经营者提出警示,以便及时采取相应管理对策,而且还为广大的投资者和银行在内的债权人判定上市公司质量和经营业绩提供科学的手段和可靠的依据.实例分析表明该模型有效、可行,为上市公司财务预警提供了新的途径.     

基于时间相依Cox回归的动态财务预警模型及实证

本文以中小企业为研究对象,从偿债能力、盈利能力等财务因素,加之公司治理、宏观环境等非财务因素出发,利用共线性检验和时间相依Cox回归构建动态财务预警模型,并与经典的Cox模型、logit模型进行对比分析。本研究的特色有二:一是通过时间相依Cox回归模型,构建随时间而变化的预警指标数据与财务危机之间的函数关系。利用偏似然估计、Breslow估计量分别拟合回归系数和基准危险强度,构建财务预警模型,预测企业在未来一段时间内每个时间点上的财务危机概率。相比于基于传统Cox模型的预警研究仅用一期的截面数据建模,本研究考虑了预警指标的动态变化对财务风险的影响,涵盖了更多的历史信息,达到提高预警精度的目的。二是考虑第一类错误“危机企业判为正常”与第二类错误“正常企业判为危机”给投资者造成的损失差异,衡量预警的“错误成本”,以错误成本最低为目标,反推出财务正常和财务危机之间的预警阈值,实现了对财务危机发生与否的提前预警功能。经过实证,本研究的财务预警模型精度较高,尤其对财务危机企业的正确识别率达到75%。相较于传统的Cox回归、logit模型,危机企业的正确识别率更高、错误成本更低。盈利能力、公司治理水平是对企业财务风险影响最为显著的因素。     

基于W-SVM的民营环保企业信用风险预警模型

2019年中国绿色债券发行量依旧稳居世界前列,成为民营环保企业重要融资渠道,但是2018年至今,大量环保企业信用风险事件频发为我们敲响了警钟,构建合适的民营环保企业信用风险预警机制迫在眉睫.环保产业属于新兴产业,并以国有企业为主导,民营企业的样本数据具有样本量小,维度高等特征,这导致传统的信用风险模型适用性不强.因此选用加权支持向量机模型,对不同类别样本采取不同权值,选取大量财务特征,最终构建出风险预警模型．研究发现加权支持向量机模型具有十分优秀的预警性能.环保企业本身具有资金回收周期较长并且项目前期投入较高等特点,建议加强财务管理,保障资产流动性,建立完善产业链.     

财务风险约束下的企业可持续增长分析——以*ST北大荒为例

针对企业在发展过程中盲目追求增长,忽视财务风险的问题,以财务可持续增长理论为基础,对*ST北大荒的增长管理进行剖析,分析发现:*ST北大荒实际增长速度远超过可持续增长速度,公司财务危机的爆发与其超速增长有必然联系.公司要实现可持续增长,应加强企业内部控制、提升企业财务战略规划能力、构建企业财务预警体系和优化企业杠杆配置.     

基于Pulic智力资本模型的上市公司财务危机预警研究

智力资本在知识经济时代对企业的发展至关重要.本文考察Pulic智力资本评测模型是否能够用于企业财务危机预警.首先基于2003年至2007年中国A股市场新增ST公司样本及配对样本的前三年数据对Pulic模型综合指标进行单变量分析证实了该模型的预警可行性,然后根据三项因素驱动指标分别运用多元判别、逻辑回归、神经网络和最小二乘支持向量机方法建立预警模型进行回判和外推.结果表明,Pulic模型在ST前两年具有较高的判断准确性,可以通过对智力资本的考察而预知企业未来的财务状况.     

基于FOA算法的Logistic回归模型的财务预警研究

制造行业中企业的财务危机频发使得财务预警系统显得格外的重要.针对现有的预警模型对制造业企业的财务风险预测精度不高的问题,以最近两年被特别处理的上市公司为研究对象,将FOA算法与Logistic财务预警模型相结合构建了FOA-Logistic财务预警模型,并对其进行了测试,测试结果显示FOA-Logistic的识别率大幅提升,证明了模型的有效性.     

基于灾变灰预测的企业雇员离职预警模型研究

企业经营过程中,雇员离职是一种正常现象,但某些年份的非正常离职则往往会给企业带来不必要的麻烦和损失,能否对这种非正常离职进行有效预警就显得十分重要.针对这一课题,构建了一个基于灾变灰预测原理的雇员离职预警模型,并结合实例检验了利用该模型进行离职预警的可行性与有效性.     

我国新三板企业股权质押融资的风险评价

针对我国新三板市场的发展情况及新三板企业的自身特征,选择工业、信息技术和材料三个行业,采用PFM模型和VaR模型分别对新三板企业股权质押融资的违约风险和市场风险进行了实证分析.研究结果表明,PFM模型对于新三板企业违约风险度量具有较强的适用性,用VaR度量的股权质押融资的市场风险及其质押率与市场实际操作基本一致.从行业均值来看,新三板工业行业的违约风险和市场风险均为最小,信息技术行业的两者次之,材料行业则都最大.但是,进一步研究并未发现新三板企业股权质押融资的市场风险与违约风险存在显著的相关性.因此,股权质押融资风险主要来源于市场波动,企业经营状况对其没有直接影响.研究结果为新三板企业股权质押融资的风险防范提供了理论借鉴.     

海上通道关键节点风险预警研究

海上通道关键节点风险预警研究是保障海上通道安全的重要环节,为准确地预警关键节点的风险,通过对历史案例的统计分析,得出主要风险源因素,构建预警指标体系,以粗糙集理论和粒子群优化原理为基础,建立了基于最小网络误差的最优风险预警模型.通过实例分析证明了该模型可对海上通道关键节点的风险进行有效预警,为保障我国国际海运通道安全,降低海上运输风险和建设"21世纪海上丝绸之路"提供决策参考.     

On a class of self-similar processes with stationary increments in higher order Wiener chaoses

We study a class of self-similar processes with stationary increments belonging to higher order Wiener chaoses which are similar to Hermite processes. We obtain an almost sure wavelet-like expansion of these processes. This allows us to compute the pointwise and local Hölder regularity of sample paths and to analyse their behaviour at infinity. We also provide some results on the Hausdorff dimension of the range and graphs of multidimensional anisotropic self-similar processes with stationary increments defined by multiple Wiener–Itô integrals.     

A REPRESENTATION FORMULA RELATED TO SCHR(O)DINGER OPERATORS

Schr(o)dinger operator is a central subject in the mathematical study of quantum mechanics.Consider the Schrodinger operator H = -△ V on R, where △ = d2/dx2 and the potential function V is real valued. In Fourier analysis, it is well-known that a square integrable function admits an expansion with exponentials as eigenfunctions of -△. A natural conjecture is that an L2 function admits a similar expansion in terms of "eigenfunctions" of H, a perturbation of the Laplacian (see [7], Ch. Ⅺ and the notes), under certain condition on V.     

Qualitative Analysis of Bifurcating Solutions in the Lengyel-Epstein Model

One of the most fundamental problems in theoretical biology is to explain the mechanisms by which patterns and forms are created in the＇living world. In his seminal paper ＂The Chemical Basis of Morphogenesis＂, Turing showed that a system of coupled reaction-diffusion equations can be used to describe patterns and forms in biological systems. However, the first experimental evidence to the Turing patterns was observed by De Kepper and her associates（1990） on the CIMA reaction in an open unstirred reactor, almost 40 years after Turing＇s prediction. Lengyel and Epstein characterized this famous experiment using a system of reaction-diffusion equations. The Lengyel-Epstein model is in the form as follows     

On a class of Riemann surfaces

It is considered the class of Riemann surfaces with dimT1 = 0, where T1 is a subclass of exact harmonic forms which is one of the factors in the orthogonal decomposition of the spaceΩH of harmonic forms of the surface, namely The surfaces in the class OHD and the class of planar surfaces satisfy dimT1 = 0. A.Pfluger posed the question whether there might exist other surfaces outside those two classes. Here it is shown that in the case of finite genus g, we should look for a surface S with dimT1 = 0 among the surfaces of the form Sg\K , where Sg is a closed surface of genus g and K a compact set of positive harmonic measure with perfect components and very irregular boundary.     

(0,1 ;0)-INTERPOLATION ON INFINITE INTERVAL (-∞, +∞)

In this paper, we study the explicit representation and convergence of (0, 1; 0)-interpolation on infinite interval, which means to determine a polynomial of degree ≤ 3n - 2 when the function values are prescribed at two set of points namely the zeros of Hn(x) and H′n(x) and the first derivatives at the zeros of H′n(x).     

CONTENTS OF VOLUME 30

正~~     

Instructions for contributions

正Applied Mathematics-A Journal of Chinese Universities,Series B(Appl.Math.J.Chinese Univ.,Ser.B)is a comprehensive applied mathematics journal jointly sponsored by Zhejiang University,China Society for Industrial and Applied Mathematics,and Springer-Verlag.It is a quarterly journal with     

Journal of Mathematical Research with Applications Guide for Authors

正Journal overview:Journal of Mathematical Research with Applications(JMRA),formerly Journal of Mathematical Research and Exposition(JMRE)created in 1981,one of the transactions of China Society for Industrial and Applied Mathematics,is a home for original research papers of the highest quality in all areas of mathematics with applications.The target audience comprises:pure and applied mathematicians,graduate students in broad fields of sciences and technology,scientists and engineers interested in mathematics.     

Staircase transportation problems with superadditive rewards and cumulative capacities

A cumulative-capacitated transportation problem is studied. The supply nodes and demand nodes are each chains. Shipments from a supply node to a demand node are possible only if the pair lies in a sublattice, or equivalently, in a staircase disjoint union of rectangles, of the product of the two chains. There are (lattice) superadditive upper bounds on the cumulative flows in all leading subrectangles of each rectangle. It is shown that there is a greatest cumulative flow formed by the natural generalization of the South-West Corner Rule that respects cumulative-flow capacities; it has maximum reward when the rewards are (lattice) superadditive; it is integer if the supplies, demands and capacities are integer; and it can be calculated myopically in linear time. The result is specialized to earlier work of Hoeffding (1940), Fréchet (1951), Lorentz (1953), Hoffman (1963) and Barnes and Hoffman (1985). Applications are given to extreme constrained bivariate distributions, optimal distribution with limited one-way product substitution and, generalizing results of Derman and Klein (1958), optimal sales with age-dependent rewards and capacities.To our friend, Philip Wolfe, with admiration and affection, on the occasion of his 65th birthday.Research was supported respectively by the IBM T.J. Watson and IBM Almaden Research Centers and is a minor revision of the IBM Research Report [6].