多指标施工方案优选的新方法

用集对分析的联系数客观地描述工程施工方案中质量、费用、工期和资源不均衡系数4项指标,既相互联系,又相互影响的状况。在4项指标权重不同的情况下,通过计算联系数的数值,取联系数的数值大的方案为优,解决了多方案多指标线性加权选优过程中综合选优结果不可分辨的问题。     

一类多面体链环模型的性质分析

多面体链环是由多个相互镶嵌而成的具有多面体形状的一种拓扑几何结构。构筑了一种新型的多面体链环L(P),给出了该链环的分支数c(L(P))的一个计算公式:c(L(P))=e(P)+v(P)。其中:v(P)和e(P)分别表示多面体P的顶点数和边数。此外,当f(P)-v(P)≠3e(P)时,得到的这类多面体链环是具有手性的,其中f(P)表示多面体P的面数。     

正态模糊需求下(T,S)存储策略的安全库存研究

基于可信性理论,研究了市场需求以正态模糊数表示的情况下,安全库存的确定问题。并通过计算示例,分析了服务水平和需求的不确定性对安全库存的影响。     

R&D expenditures and firm growth – is small beautiful?

ABSTRACT

This paper examines how efficiently different groups of firms use their R&D expenditures. To this end, it investigates how the empirical relationship between firms' R&D expenditures and their sales growth varies with different values of firm size, firm age, and the number of firms in the respective industry. Using panel data for Switzerland ranging from 1995 to 2012, the paper finds that smaller, more mature firms show a more positive relation between R&D expenditures and sales growth than both relatively larger or younger firms. The paper argues that, on the one hand, these firms can benefit from various small size advantages in the R&D process, such as more motivated researchers, caused by a stronger connection to the firm's fate. On the other hand, these firms can also benefit from a well-established R&D department that allows absorbing the latest technological developments. The paper further finds that industries consisting of many small firms show a more positive relation between R&D expenditures and sales growth than industries consisting of only a few large firms. The intuition behind this result is that industries consisting of many small firms imply more independent innovative trials, which then together result in a higher probability of discovering successful innovations. In sum, the paper finds that groups consisting of a large number of small, more mature firms spend their R&D in the most efficient way.     

The asymptotic distribution of Nagar's bias-adjusted TSLS estimator under partial identification

The asymptotic distribution of the Nagar bias-adjusted two-stage-least-squares estimator is studied under the assumption of partial identification when the number of instruments increases at the same rate as the sample size and the errors are normally distributed.     

低工资率下向左上方倾斜的劳动力供给曲线分析——“民工荒”现象的又一种解释

近年来屡屡出现的＂民工荒＂现象是由于低工资率下向左上方倾斜的劳动力供给曲线的存在而导致的。随着工资率的上涨,低收入者的劳动供给时间将减少,从而导致＂民工荒＂现象的出现。＂民工荒＂现象的微观主体原因是,新生代农民工已经成为农村劳动力迁移者的主体。中国目前仍处于＂刘易斯拐点＂前期,可以预计,农民工收入将步入快速增长期,从而给中国产业结构的调整带来新的约束条件。     

基于区间数的后勤装备采购决策方法研究

基于区间数的可能度及相离度理论建立了后勤装备采购的不确定多属性决策模型,以区间数的形式综合考虑决策指标权重及指标值,更多地保留了决策信息,使评价结果更为客观、真实可靠,并结合案例,讨论了运用该决策模型进行决策的方法和详细步骤。     

Calm Consideration of Prosperous Growth of Convertible Bond

As a re-financing instrument for listed companies, convertible bond has been greatly promoting the prosperity of China capital market. However, due to the institutional defect of stock ownership is severe, convertible bond has also inevitably caused the negative effect on the situation that the non-negotiable shareholders are frantically depriving the negotiable shareholders of equity when enriching the financial products and releasing the financial risk. Taking ShanYing convertible bond as an example, the article researches the reasonableness in the market pricing by using the Single-Index Model and further analyze reasonable activities of the present listed companies＇ tending to issuing convertible bond.     

小议图书选题的经济预测

图书选题的经济预测是图书选题的重要内容之一.文章从编辑人员的角度,比较详细地介绍了图书选题经济预测的前提、内容和常用方法,阐述了图书选题经济预测的必要性,提出了编辑人员应做到既懂编辑业务又会算经济的观点.