基于覆盖粗糙集理论中的约简与求核

提出基于分辨矩阵的求覆盖粗糙集约简与核的方法,在Zakowski提出的覆盖粗糙集模型的基础上,利用分辨矩阵的一些性质,把文献[10]中的粗糙集理论中的约简与求核方法应用到基于覆盖的粗糙集理论中,既简化了覆盖粗糙集理论中的约简与求核过程,又推广了文献[10]的方法,最后举例说明此方法的有效性。     

Pd2团簇结构与能级分布的理论研究

在相对论有效原子实势(RECP)近似下,用密度泛函(B3LYP/SDD)方法,计算Pd2及其±1价和±2价分子离子的结构,光谱性质和能级分布.最后讨论了最高占据轨道(HOMO)与最低空轨道(LUMO)之间的能级间隙(HLG),分析了团簇的化学活性.     

以文化力提升中国-东盟博览会的竞争力

在中国—东盟博览会这一国际性经贸盛会中,文化力以其独特的功能,不仅推动了博览会核心竞争力的形成和发展,而且以丰富深厚的文化内涵,提升了博览会的品牌价值,以独特绚丽的文化经营,提高了博览会的吸引力,并以丰富多彩的文化产业项目,扩展了博览会的经营张力。     

浅析新形势下中资寿险公司的企业文化建设

本文论述了如何充分利用建设全面小康社会的市场环境和条件，通过企业文化建设，提升企业的核心竞争力，促进中资寿险公司持续快速发展。     

Minimal configuration trees

A graph is singular of nullity η if zero is an eigenvalue of its adjacency matrix with multiplicity η. If η(G)=1, then the core of G is the subgraph induced by the vertices associated with the non-zero entries of the zero-eigenvector. A connected subgraph of G with the least number of vertices and edges, that has nullity one and the same core as G, is called a minimal configuration. A subdivision of a graph G is obtained by inserting a vertex on every edge of G. We review various properties of minimal configurations. In particular, we show that a minimal configuration is a tree if and only if it is a subdivision of some other tree.     

The Weak Sequential Core for Two-Period Economies

We adapt the classical core concept to deal with situations involving time and uncertainty. We define the weak sequential core as the set of allocations that are stable against coalitional deviations ex ante, and moreover cannot be improved upon by any coalition after the resolution of uncertainty. We restrict ourselves to credible deviations, where a coalitional deviation cannot be counterblocked by some subcoalition. We study the relationship of the resulting core concept with other sequential core concepts, give sufficient conditions under which the weak sequential core is non-empty, but show that it is possible to give reasonable examples where it is empty.Helpful comments of Hans Peters are gratefully acknowledged. We would also like to thank an anonymous referee for very helpful and constructive suggestions.     

加入WTO对临汾农业的影响及对策研究

从临汾市农业生产现状和主要农产品的国际比较出发,论述了WTO对该市农业的主要影响,提出了该市全面提高农产品竞争力的具体措施,以及如何使政策环境与社会氛围与WTO相适应的对策。     

论平衡管理

本文提出了一种新的管理方法———平衡管理。通过对平衡管理的涵义、内容和价值的分析可以看出 ,在加入WTO后的中国 ,运用平衡管理是企业在市场竞争中获胜的法宝     

绍兴纺织企业集群竞争力的比较研究

企业集群已经成为推动区域经济发展的新力量.在选择了衡量纺织企业集群竞争力的指标体系的基础上,对绍兴纺织企业集群的竞争力分别作了国内和国际比较,发现绍兴纺织企业集群处于竞争力初步显现阶段.尽管在国内来看,其竞争力较强,但与国际发达的纺织企业集群相比,其竞争力有待进一步提高.在实证分析的基础上,提出了提高绍兴纺织企业集群竞争力的可行性对策.     

On the core and nucleolus of minimum cost spanning tree games

We develop two efficient procedures for generating cost allocation vectors in the core of a minimum cost spanning tree (m.c.s.t.) game. The first procedure requires O(n ²) elementary operations to obtain each additional point in the core, wheren is the number of users. The efficiency of the second procedure, which is a natural strengthening of the first procedure, stems from the special structure of minimum excess coalitions in the core of an m.c.s.t. game. This special structure is later used (i) to ease the computational difficulty in computing the nucleolus of an m.c.s.t. game, and (ii) to provide a geometric characterization for the nucleolus of an m.c.s.t. game. This geometric characterization implies that in an m.c.s.t. game the nucleolus is the unique point in the intersection of the core and the kernel. We further develop an efficient procedure for generating fair cost allocations which, in some instances, coincide with the nucleolus. Finally, we show that by employing Sterns' transfer scheme we can generate a sequence of cost vectors which converges to the nucleolus. Part of this research was done while the author was visiting the Department of Operations Research at Stanford University. This research was partially supported by Natural Sciences and Engineering Research Council Canada Grant A-4181.