共查询到20条相似文献,搜索用时 31 毫秒
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供应链企业可靠性是供应链可靠性的重要问题之一.在国内外研究文献综述基础上提出了供应链企业节点可靠性的初步预警指标.而后以此为基础,利用P-SVM方法完成了指标体系的构建及供应链企业可靠性预警. 相似文献
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《Discrete Mathematics》2022,345(12):113091
We extend the duality between acyclic orientations and totally cyclic orientations on planar graphs to dualities on graphs on orientable surfaces by introducing boundary acyclic orientations and totally bi-walkable orientations. In addition, we provide a reciprocity theorem connecting local tensions and boundary acyclic orientations. Furthermore, we define the balanced flow polynomial which is connected with tension polynomial by duality and with totally bi-walkable orientations by reciprocity. 相似文献
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We give a new argument on the classification of solutions of Gauss curvature equation on R2; which was first proved by W. Chen and C. Li [Duke Math. J., 1991, 63(3): 615–622]. Our argument bases on the decomposition properties of the Gauss curvature equation on the punctured disk. 相似文献
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结构方程模型是当前研究顾客满意和顾客忠诚的主流方法之一,但基于结构方程对顾客满意和顾客忠诚进行市场细分方法的研究却十分缺乏.基于结构方程模型进行市场细分算法的应用研究,并对得出的细分结果进行了解释. 相似文献
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Yasuki Sekiguchi 《Operations Research Letters》1983,2(5):243-247
A facial structure of the node packing polytope, i.e., of the convex hull of integer solutions of the node packing problem, on hypergraphs is studied. First, the results extracted by Chvàtal and by Balas and Zemel on canonical facets of the node packing polytopes on graphs are generalized to derive some specific hypergraphs having canonical facets. Second, it is shown that the facial structure of the node packing polytope on a hypergraph, named a fat graph, has a very close relationship to the facial structures of the node packing polytope and also of the convex hull of integer solutions of an integer linear program, which are defined on a specific graph corresponding to the fat graph. 相似文献
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Christian Ronse 《Mathematica Slovaca》2013,63(5):959-978
Jordens and Sturm investigated the link between closure systems on sets and closure systems on partitions. We extend that study to the wider framework of partial partitions, and highlight better the relation between these two families of closure systems. Then we consider the construction of a closure operator on partial partitions by the iterated application a set operator to the blocks of a partial partition; the resulting closure system fits into our framework. 相似文献
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《Discrete Mathematics》2020,343(8):111915
Ivashchenko proposed the study of contractible transformations on graphs because of their applications to computer image analysis, theory of molecular spaces, and digital topology. He published five papers on this subject. Contractible transformations have recently been applied to topological data analysis. This paper presents a counterexample to several results that appeared in one of Ivashchenko’s works. 相似文献
10.
Sehie Park 《Nonlinear Analysis: Theory, Methods & Applications》2010,72(2):549-554
All results in “Some properties of abstract convexity structures on topological spaces” by S.-w. Xiang and H. Yang [S.-w. Xiang, H. Yang, Some properties of abstract convexity structures on topological spaces, Nonlinear Analysis 67 (2007) 803-808] and “A further characteristic of abstract convexity structures on topological spaces” by S.-w. Xiang and S. Xia [S.-w. Xiang, S. Xia, A further characteristic of abstract convexity structures on topological spaces, J. Math. Anal. Appl. 335 (2007) 716-723] are shown to be consequences of known ones or can be stated in more general forms. 相似文献
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Potential Analysis - We provide the necessary and sufficient characterizations on a pair of positive radial functions so that the two-weight Hardy inequalities hold true on homogeneous groups, one... 相似文献
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Fabricio Macià 《偏微分方程通讯》2013,38(6):1137-1146
We study the concentration of eigenfunctions of the Laplace–Beltrami operator on manifolds all whose geodesics are closed (the so-called Zoll manifolds). Some results on the structure of the set of invariant semiclassical measures associated to sequences of eigenfunctions are given. Among these, we show that any probability measure on the unit tangent bundle of a compact rank-one symmetric space that is invariant by the geodesic flow may be realized as the semiclassical measure of a sequence of eigenfunctions of the Laplacian. This extends a previous result of Jakobson and Zelditch on spheres. 相似文献
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Francesco Sala 《Central European Journal of Mathematics》2012,10(4):1455-1471
We provide generalizations of the notions of Atiyah class and Kodaira-Spencer map to the case of framed sheaves. Moreover,
we construct closed two-forms on the moduli spaces of framed sheaves on surfaces. As an application, we define a symplectic
structure on the moduli spaces of framed sheaves on some birationally ruled surfaces. 相似文献
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Pierre Mounoud 《Geometriae Dedicata》2007,126(1):275-282
We look at geodesic foliations on the Lorentzian 2-tori which are lightlike on a proper subset. We prove that they do not
exist if the torus is geodesically complete. We describe some properties of their orthogonal foliations and we give several
new examples.
相似文献
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以企业为价值感受主体、客户为价值感受客体的客户价值,衡量了客户对企业的相对重要性.首先基于传导变换理论,给出传导知识的定义,然后建立传导度以度量主动变换导致客户价值发生传导变换的效果,探讨了客户价值传导信息元集和传导知识的获取.研究可以为企业提供制定客户关系管理策略的依据,为客户价值研究提供新的思路. 相似文献
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Josef Šlapal 《Applied Categorical Structures》2008,16(4):503-519
We introduce and study a concept of a convergence structure on a concrete category. The concept is based on using certain
generalized filters for expressing the convergence. Some basic properties of the convergence structures are discussed. In
particular, we study convergence separation and convergence compactness and investigate relationships between the convergence
structures and the usual closure operators on categories.
Dedicated to Professor E. Giuli and Professor G. Preuss on the occasion of their 65th birthdays. 相似文献
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We investigate the cop number of graphs based on combinatorial designs. Incidence graphs, point graphs, and block intersection graphs are studied, with an emphasis on finding families of graphs with large cop number. We generalize known results on Meyniel extremal families by supplying bounds on the incidence graphs of transversal designs, certain G‐designs, and BIBDs with Families of graphs with diameter 2, C4‐free, and with unbounded chromatic number are described with the conjectured asymptotically maximum cop number. 相似文献
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在服务质量差距分析模型的基础上,基于服务管理差距和服务质量差距测评体系,运用结构方程建模方法,建立了企业内部服务管理差距与顾客感知服务质量差距之间的关系路径图和关系模型,定量研究了四个服务管理差距对服务质量差距的影响关系、服务管理差距测评指标对相应的四个服务管理差距的影响关系,为顾客感知服务质量差距的测量和评价提供了技术和方法.结合某外语培训学校服务管理实际进行了案例研究,为企业服务质量的诊断和改进提供了科学依据. 相似文献