Industry risk transmission channels and the spillover effects of specific determinants in China’s stock market: A spatial econometrics approach

This paper uses a spatial econometrics approach to study the industry risks in China’s stock market. We comprehensively consider the real linkage and information risk transmission channels and analyze the risk spillovers of specific determinants. Our empirical results show the following: 1) The real linkage channel and information channel are both effective transmission channels for driving spillover effects, and the information channel is of the utmost importance. 2) The spillover effects of specific determinants exist and are persistent. The superposition of spillover effects may lead to extreme risk. 3) The transmission channels and spillover effects are asymmetric in different regimes.     

自适应约束下的双边全变差正则化超分辨率重建

在经典的双边全变差(BTV)超分辨率重建中,加权系数和正则化参数的恒定性导致重建结果边缘保持能力受限。为此,提出了一种自适应约束的BTV正则化先验模型。算法首先定义了图像的局部邻域残差均值以区分当前像素属于平坦区域还是边缘区域;然后针对加权系数的不变性导致边缘削弱的问题,利用边缘方向和垂直边缘方向扩散性的不同,设计自适应权重矩阵;最后根据代价函数的极值问题推导出迭代公式,从而进行图像的超分辨率重建,重建过程中采用自适应的方法确定正则化参数,以便求得代价函数的全局最优解,提高了算法的鲁棒性。实验结果表明：与双三次线性插值法和经典BTV算法相比,该算法取得了更好的视觉效果和更高的峰值信噪比,更多地保留了图像的边缘细节信息。     

我国养老基金的投资模式

人口老龄化对养老保险制度提出了严峻的挑战 ,“统账结合”的基金缺口将通过国有股减持来弥补。而出于保值增值的需要 ,具有积累或部分积累性质的养老基金有必要进入资本市场 ,并具备了一定的进入条件。相应地 ,养老基金的投资模式也要进行多样化的投资选择 ,以达到保值增值的目的。     

Multivariate Hill Estimators

We propose two classes of semi‐parametric estimators for the tail index of a regular varying elliptical random vector. The first one is based on the distance between a tail probability contour and the observations outside this contour. We denote it as the class of separating estimators. The second one is based on the norm of an arbitrary order. We denote it as the class of angular estimators. We show the asymptotic properties and the finite sample performances of both classes. We also illustrate the separating estimators with an empirical application to 21 worldwide financial market indexes.     

我国外资企业R&D水平的决定因素

鼓励外商进行R&D投资以推动技术进步是我国利用FDI的重要目标,但成效与目标相去甚远。FDI企业的R&D水平低,这既与外资企业R&D动机有关,也与我国区位条件有关。利用27个省、市、区2003-2007年的面板数据模型进行经验分析表明:经济发展水平、市场规模、外资规模等与外资企业R&D水平正相关,而R&D人力资本、贸易体制的开放水平等与外资企业R&D水平反相关。R&D人力资本、市场导向、生产的本地化程度回归系数符号为负与现有的研究结论不一致,主要原因可能是知识产权保护水平不高。     

中小企业资本结构影响因素的实证分析——基于2005—2009年中小板上市公司平衡面板数据

以2005—2009年我国中小板上市公司平衡面板数据为样本,从盈利能力、资产规模、非债务税盾、成长性、资产的流动性、资产的抵押价值和股权结构等七个方面分析其对中小企业资本结构的影响,其研究结果表明,中小企业的盈利能力与总资产负债率和短期资产负债率显著负相关,中小企业的资产规模、成长性、资产担保与总资产负债率、长期资产负债率和短期资产负债率显著正相关,中小企业的非债务税盾和股权结构与总资产负债率和长期资产负债率不存在显著的相关关系。     

一个K次Fibonacci数列{Fn^k}n=1^∞的线性恒等式

证明了k次Fibonacci数列{Fnk}n∞=1中连续的k＋2个数的线性恒等式并给出具体公式。     

企业研发边界影响因素的国外研究综述

企业研发边界的本质是寻求企业研发资源的最优配置。近年来,国外学者将影响企业研发边界的因素分为企业特征因素和行业与技术特征因素两大类。其中,企业特征因素包括研发强度、企业规模、纵向一体化、多样化、现金流和组织结构等;行业与技术特征因素包括专有性、信息流、创新速度等。可见,研发边界影响因素的相关结论并不十分一致,仍有待进一步的研究。     

微分中值定理的证明与推广

本文分别用两种方法证明了柯西中值定理及拉格朗日中值定理,并对微分中值定理加以推广。     

The response of term rates to monetary policy uncertainty

This paper shows that greater uncertainty about monetary policy can lead to a decline in nominal interest rates. In the context of a limited participation model, monetary policy uncertainty is modeled as a mean preserving spread in the distribution for the money growth process. This increase in uncertainty lowers the yield on short-term maturity bonds because the household sector responds by increasing liquidity in the banking sector. Long-term maturity bonds also have lower yields but this decrease is a result of the effect that greater uncertainty has on the nominal intertemporal rate of substitution—which is a convex function of money growth. We examine the nature of these relations empirically by introducing the GARCH-SVAR model—a multivariate generalization of the GARCH-M model. The predictions of the model are broadly supported by the data: higher uncertainty in the federal funds rate can lower the yields of the three- and six-month treasury bill rates.