Recent studies analyzing the liquidity of emerging equity markets （EEM） focus mainly on two independent variables： （1） the turnover ratio and （2） value of equity traded. They ignore the impact of the market con...Recent studies analyzing the liquidity of emerging equity markets （EEM） focus mainly on two independent variables： （1） the turnover ratio and （2） value of equity traded. They ignore the impact of the market concentration of stock traded which could generate price distortion/manipulation. This study empirically estimates the impact of market structure （concentration） and liquidity （turnover ratio） on equity performance （price/returns） of 19 EEM. We use panel data for the period 1992-2000 and least square dummy variable regression technique that measure fixed effects and the dynamics of adjustment. The results show the significance of both independent variables. Liquidity favours investment, and market concentration suggests the potential for market/price manipulation that requires regulatory policies. These results indicate success of reform policies aimed at capital deepening to improve efficient capital allocation and provide profitable investment opportunities.展开更多
Infinitesimal prolongation theorem is extended from sequences to nets based on κ-saturated nonstandard model. As its an application, a main property about topology of uniform convergence is proved. The proof is much ...Infinitesimal prolongation theorem is extended from sequences to nets based on κ-saturated nonstandard model. As its an application, a main property about topology of uniform convergence is proved. The proof is much simpler than it was, meanwhile the nonstandard characteristics of convergence with respect to u.c. topology is given.展开更多
The visualization of arteries and heart usually plays a crucial role in the clinical diagnosis, but researchers face the problems of region selection and mutual occlusion in clinical visualization. Therefore, the arte...The visualization of arteries and heart usually plays a crucial role in the clinical diagnosis, but researchers face the problems of region selection and mutual occlusion in clinical visualization. Therefore, the arteries and the heart cannot be easily visualized by current visualization methods. To solve the problems, we propose a new framework for arteries and cardiac visualization by combining a priori knowledge and the set operations.Firstly, a suitable region can be easily determined in the transfer function space with a priori knowledge and the visual feedback results. Secondly, the arteries and the heart can be directly extracted by the marked seed point.Finally, the arteries and the heart are separated for solving mutual occlusion through the set operations. This framework can easily solve the mutual occlusion problem in clinical visualization and greatly improve the region selection method in the transfer function space. Its effectiveness has been demonstrated on the basis of many experimental results.展开更多
文摘Recent studies analyzing the liquidity of emerging equity markets （EEM） focus mainly on two independent variables： （1） the turnover ratio and （2） value of equity traded. They ignore the impact of the market concentration of stock traded which could generate price distortion/manipulation. This study empirically estimates the impact of market structure （concentration） and liquidity （turnover ratio） on equity performance （price/returns） of 19 EEM. We use panel data for the period 1992-2000 and least square dummy variable regression technique that measure fixed effects and the dynamics of adjustment. The results show the significance of both independent variables. Liquidity favours investment, and market concentration suggests the potential for market/price manipulation that requires regulatory policies. These results indicate success of reform policies aimed at capital deepening to improve efficient capital allocation and provide profitable investment opportunities.
基金Supported by the Speaial Science Foundation of the Edneational Committee of Shaanxi Province(oojk207).
文摘Infinitesimal prolongation theorem is extended from sequences to nets based on κ-saturated nonstandard model. As its an application, a main property about topology of uniform convergence is proved. The proof is much simpler than it was, meanwhile the nonstandard characteristics of convergence with respect to u.c. topology is given.
基金the National Basic Research Program(973)of China(No.2013CB329401)the National Natural Science Foundation of China(No.61375020)the Cross Research Fund of Biomedical Engineering of Shanghai Jiao Tong University(No.YG2013ZD02)
文摘The visualization of arteries and heart usually plays a crucial role in the clinical diagnosis, but researchers face the problems of region selection and mutual occlusion in clinical visualization. Therefore, the arteries and the heart cannot be easily visualized by current visualization methods. To solve the problems, we propose a new framework for arteries and cardiac visualization by combining a priori knowledge and the set operations.Firstly, a suitable region can be easily determined in the transfer function space with a priori knowledge and the visual feedback results. Secondly, the arteries and the heart can be directly extracted by the marked seed point.Finally, the arteries and the heart are separated for solving mutual occlusion through the set operations. This framework can easily solve the mutual occlusion problem in clinical visualization and greatly improve the region selection method in the transfer function space. Its effectiveness has been demonstrated on the basis of many experimental results.
