公司多元化对证券分析师关注度的影响——基于证券分析师决策行为视角的经验分析

本文基于证券分析师的决策行为,采用中国证券市场的相关数据,研究了上市公司多元化水平与证券分析师关注度之间的关系.本文的研究发现,公司的多元化水平越高,证券分析师对其关注度越低,其原因在于随着公司多元化水平的提高,证券分析师获取公司信息所需付出的成本也相应提高,而信息成本的提高往往会驱使证券分析师放弃关注这样的公司;进一步的研究发现,相关多元化的公司相对于非相关多元化的公司更受证券分析师的青睐,其原因在于相关多元化的公司由于公司业务之间具有相关性,证券分析师获取的信息和应用的技术都具有共通性,这会减少证券分析师的成本.     

The <Emphasis Type="Italic">p</Emphasis>-maxian problem on block graphs

This paper deals with the p-maxian problem on block graphs with unit edge length. It is shown that the two points with maximum distance provide an optimal solution for the 2-maxian problem of block graphs except for K ₃. It can easily be extended to the p-maxian problem of block graphs. So we solve the p-maxian problem on block graphs in linear time.     

A Study to Improve the Method of Ascertaining Attribute Weight Based on Rough Sets Theory

There are some shortages to ascertain attribute weight based on rough set in current studies. In this paper, attrib- ute importance represented by rough set is studied deeply. Aiming at the existing problems, algebra presentation of rough sets is proved to be more comprehensive than its information presentation, then a new method of ascertaining attribute weigh is put forward based on rough set conditional entropy. Finally, it is shown that the new method is more reasonable than the old one by an example.     

Benevolence-dominant,authoritarianism-dominant,and classical paternalistic leadership: Testing their relationships with subordinate performance

We propose a new typology of paternalistic leadership styles based on how leaders demonstrate authoritarianism and benevolence, the two essential components of this type of leadership. Benevolence-dominant paternalistic leadership refers to leaders' sole dependence on the use of benevolence without their strong assertion of authority, whereas authoritarianism-dominant paternalistic leadership is based mainly on authoritarianism itself; classical paternalistic leadership, which best fits early observations of paternalistic leaders, refers to the salient combination of both leadership components. We used two distinct samples and methods to test this typology and the association with subordinate performance. Across the two studies, a field investigation with Taiwanese military supervisor-subordinate dyads and a hypothetical scenario experiment with U.S. working adults, we found a positive relationship between classical paternalistic leadership and subordinate performance as strong as that between benevolence-dominant paternalistic leadership and performance. Our findings echo the phenomenon that paternalistic leaders tend to combine benevolence with authoritarianism to affect subordinate performance.     

A continuous characterization of the maximum vertex-weighted clique in hypergraphs

For a simple graph G on n vertices with adjacency matrix A, Motzkin and Strauss established a remarkable connection between the clique number and the global maximum value of the quadratic programm: \(\textit{max}\{ \mathbf {x}^T A \mathbf {x}\}\) on the standard simplex: \(\{\sum _{i=1}^{n} x_i =1, x_i \ge 0 \}\). In Gibbons et al. (Math Oper Res 122:754–768, 1997), an extension of the Motzkin–Straus formulation was provided for the vertex-weighted clique number of a graph. In this paper, we provide a continuous characterization of the maximum vertex-weighted clique problem for vertex-weighted uniform hypergraphs.     

知识整合、组织创新与组织绩效：华南地区企业的实证研究

主要探讨企业知识整合、组织创新与组织绩效之间的关系,并选择我国华南地区的142家企业为样本进行实证研究。理论贡献在于证实了上述变量之间的影响路径,即知识整合可以通过技术创新来提升组织绩效,也可以通过管理创新来提升组织绩效,知识整合提升组织绩效的另外一条路径是知识整合→技术创新→管理创新→组织绩效。     

考虑学习效应的可复用物流容器供应链的最优运作决策研究

本文研究了单个制造商通过可复用物流容器将产品送至单个零售商的闭环供应链,在可复用物流容器回收处理后得到的数量小于发出时数量的条件下,本文考虑可以通过工人操作过程中存在的学习效应来降低可复用物流容器的丢弃率。本文构建了两个模型：模型1未考虑维修中心工人操作过程中存在的学习效应,可复用容器的丢弃率为随机变量;模型2考虑维修中心工人在操作过程中存在学习效应,使得可复用物流容器的丢弃率不断降低。通过定量分析确定了最小联合库存总成本下的最优运行周期、货物配送次数以及可复用容器配送次数。结果表明,在任一供应链参与者不采取降本措施的情况下,仅考虑工人在操作过程中存在的学习效应就可以起到降低容器丢弃率、节约总成本的效果。此外,本文还分析了制造商可以支付给工人的最大维修费用,为企业的成本投入预算提供决策依据。     

政府的公共补贴对风险投资的促进作用

结合信息不对称条件下的契约设计和存在双边道德风险的激励问题,考虑在风险投资者和创业者之间的最优契约关系中,政府的公共补贴对风险投资者和创业者之间的收益关系的影响。发现在风险投资者和创业者之间存在着一种"财富传递效应",即政府对风险投资者投资损失的补贴可以增加创业者的期望收益,因此这种补贴政策可以激励更多的科技人才和管理人才投入到创业活动中来。在没有政府公共补贴时,一些因投资价值相对较小而无法获得风险资本投资的项目,在有政府公共补贴后能够获得风险资本的投资,即政府的公共补贴不仅能增加风险资本的供给,也能增加创业企业对风险资本的需求。     

多层供应链外包模式的选择及其协调

本文研究由两个原始设备制造企业（品牌企业）、一个代工企业和一个供应商组成的多层供应链的外包模式选择问题。应用主从博弈和纳什博弈理论,当一个原始设备制造企业的外包模式给定后,通过对不同外包模型求解比较,给出了后跟进的原始设备制造企业外包模式的最优选择策略。研究发现：后跟进的原始设备制造企业最优策略应采取与前一个原始设备制造企业相同的外包策略。针对最优外包策略,还设计了使供应链达到协调的二部定价契约机制,提高了外包供应链的竞争力。