熵指数的可分解特性及其在多元化测度中的应用

熵是对不确定性的度量,被广泛应用于多个学科领域。可分解特性是熵统计量的良好品质,它使事件的总体熵可以分解为类间熵和平均的类内熵。这种特性应用到公司多元化水平的测度中,可以有效地解决多元化指数在统计分析中的多重共线性问题。     

Delegated portfolio management and diversification

This article analyses the potential diversification benefits available to high-net-worth investors utilizing multiple portfolio managers. We show that enlisting seven actively managed portfolios from multiple portfolio managers generate significant benefits in terms of risk reduction, and, interestingly, diversification benefits are shown to be larger for low-risk portfolios compared to high-risk portfolios.     

Exploring the effect of diversification strategy on R&D intensity using quantile regression: evidence from France

This study examines the relationship between firm diversification strategy and R&D intensity for a sample of large French companies between 2008 and 2012. Applying quantile regression, we provide evidence that the choice of diversification affects R&D intensity in a differentiated way. The results indicate that a low level of diversification (below the twentieth quantile) has no significant impact on R&D intensity. Conversely, a moderate or high level of diversification has a negative and significant impact on R&D intensity. These findings suggest that R&D intensity seems to be significantly higher in related-business firms than in unrelated-business firms.     

复杂技术网络化布局三维风险及其规避策略研究

复杂技术如同一个多元技术网络系统,其网络化布局存在潜在的横向风险、纵向风险及结构风险。对应三维度风险分析,从网络合作规则设计、技术网络治理与技术网络资金支撑体系构建以及产权制度创新3个方面,提出了应对复杂技术网络化布局风险的规避策略与制度设计,对了解我国复杂技术创新网络以及加强网络风险治理具有一定的借鉴意义。     

The relationship between business diversification and productivity: considering the impact of process innovation at different corporate life cycles

This paper investigates the link between a firm's process innovation (PI) and its segment productivity at different life cycles. The results show that business diversification is negatively associated with a firm's productivity, and further reveal that a firm's PI moderates the above relationship. In addition, the corporate life cycle literature builds blocks for this study to explain that the involvement of administrative costs varies across life cycles when diversified firms get mature and bigger. Our empirical evidence indicates that the potential costs of a complex organisational structure contingent on business diversification at a firm's mature life cycle could be alleviated by the conduct of process innovation. As process innovation at different life cycles may alter managerial incentive that leads to different firm performance, the managerial implication is that diversified firms should appropriately engage in process innovation to prevent unfavourable liability from the development of their businesses.     

Efficiency Defense in EU and US Horizontal Merger Control if Costs are Endogenous

If fixed costs are endogenous, following from profit maximization, horizontal mergers are always profitable. They cause the price to rise and consumer surplus to decrease. A case of horizontal merger in which, according to the requirement of US and EU Merger Guidelines for an efficiency defense to be acceptable, the price declines or remains constant does not exist and therefore cannot be expected by profit maximizing partners to arise following a merger. Merger control should be guided by focusing on total welfare. Permitting cooperation in R&D, although profitable, is likely to be detrimental to welfare.     

Trends in stock-bond correlations

Previous studies document the existence of long-run trends in comovements in the stock and bond markets. Following these findings, this article examines possible trends in stock-bond return correlations. To this end, we introduce a trend component into a smooth transition regression (STR) model including the multiple transition variables of Aslanidis and Christiansen (2012). The results indicate the existence of significant decreasing trends in stock-bond correlations for many advanced safer countries. In addition, although stock market volatility continues to be an important factor in stock-bond correlations, the short rate and yield spread become only marginally significant once we introduce the trend component. Our out-of-sample analysis also demonstrates that the STR model, including the volatility index and time trend as the transition variables, dominates other models. Furthermore, we find a significant increase in stock-bond correlations for riskier euro countries around the beginning of the euro crisis. Our findings of decreasing and increasing trends in stock-bond correlations can be considered a consequence of the decreasing effects of diversification and more intensive flight-to-quality behaviour that have taken place in recent years and after the euro crisis.     

浅析现代牛仔服发展趋向

该文基于现代流行多元化、个性化的特点，从牛仔服的设计者和穿着者出发，通过对现代牛仔服新变化的分析，从款式、面料、色彩等方面论证了牛仔服多元化发展的趋向。     

多元化经营与经营绩效——基于中国纺织业上市公司的实证研究

本文采用2003～2005年相关数据的算术平均数,通过方差分析和相关分析相结合的方法,对我国纺织业上市公司多元化经营与其盈利能力、成长能力和绩效稳定性能力的关系进行了实证分析。理论分析和实证研究表明：适度的多元化经营对于我国纺织企业在现阶段是可行的,也是合理的。     

多元化教学法在《社区护理学》教学中的应用

目的:探讨多元化教学法在《社区护理学》教学中的应用。方法:实验组采用PBL教学法、现代教育技术教学法、角色扮演法及激励教学法等多种教学方法,对照组采用传统的以讲授为主的授课方法。结果:实验组考试成绩高于对照组组,且对课堂教学效果满意。结论:多元化教学法能激发学生学习兴趣、培养学生能力、提高教师综合能力及教学水平,在今后的教学中值得推广。