基金经理能否通过主动性管理提升业绩,这是实务界和理论界共同关注的一个重要问题。本文利用开放式基金2005~2009年的数据进行研究发现:将容易获得的跟踪误差和R^2综合为复合主动性指标(Composite Active Index,CAI),可以作为主动性管...基金经理能否通过主动性管理提升业绩,这是实务界和理论界共同关注的一个重要问题。本文利用开放式基金2005~2009年的数据进行研究发现:将容易获得的跟踪误差和R^2综合为复合主动性指标(Composite Active Index,CAI),可以作为主动性管理能力的测量指标;在我国使用包括了完整的上升和下降阶段的时间段(两年)作为测量主动性的估计期是恰当的;主动性确实能够作为基金未来业绩的预测指标,即基金经理通过主动性管理显著地提升了基金业绩。展开更多
This paper analyzes the fuzzy variable structure control algorithms for delay systems and describes the compensation mechanism of the integral factor to the effect of the delay. Based on the linearized model of the co...This paper analyzes the fuzzy variable structure control algorithms for delay systems and describes the compensation mechanism of the integral factor to the effect of the delay. Based on the linearized model of the congestion-avoidance flow-control mode of transmission control protocol (TCP), we present delay control algorithms for active queue management (AQM) and discuss the parameter tuning of the algorithms. The NS (network simulator) simulation results show that the proposed control scheme for the nonlinear TCP/AQM model has good performance and robustness with respect to the uncertainties of the round-trip time (RTT) and the number of active TCP sessions. Compared to other similar schemes, our algorithms perform better in terms of packet loss ratio, throughput and butter fluctuation.展开更多
文摘基金经理能否通过主动性管理提升业绩,这是实务界和理论界共同关注的一个重要问题。本文利用开放式基金2005~2009年的数据进行研究发现:将容易获得的跟踪误差和R^2综合为复合主动性指标(Composite Active Index,CAI),可以作为主动性管理能力的测量指标;在我国使用包括了完整的上升和下降阶段的时间段(两年)作为测量主动性的估计期是恰当的;主动性确实能够作为基金未来业绩的预测指标,即基金经理通过主动性管理显著地提升了基金业绩。
文摘This paper analyzes the fuzzy variable structure control algorithms for delay systems and describes the compensation mechanism of the integral factor to the effect of the delay. Based on the linearized model of the congestion-avoidance flow-control mode of transmission control protocol (TCP), we present delay control algorithms for active queue management (AQM) and discuss the parameter tuning of the algorithms. The NS (network simulator) simulation results show that the proposed control scheme for the nonlinear TCP/AQM model has good performance and robustness with respect to the uncertainties of the round-trip time (RTT) and the number of active TCP sessions. Compared to other similar schemes, our algorithms perform better in terms of packet loss ratio, throughput and butter fluctuation.