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121.
基于LDD的预取策略如DDP考虑了数据距离,但是没有考虑数据的访问概率和更新频率和数据大小,针对以上问题提出基于价值的数据预取(CDP)策略,一些重要的数据预取因素如访问概率、更新频率、数据项大小、数据距离和有效范围等都包含在价值函数里,根据价值函数值的大小来选择被预取的数据。通过实验对比,CDP比DDP策略更有效的提高缓存的命中率。 相似文献
122.
曹飞 《广西财经学院学报》2012,(6):64-69
由于人口老龄化率的预测具有高度非线性特征,这与BP神经网络能够处理非线性问题的特征相符合,但BP神经网络算法易使解陷入局部极小。基于L-M算法的改进BP神经网络可以有效克服这一问题,而且收敛速度快。通过具体的仿真及实践结果验证了改进BP的有效性,并对未来五年的中国老龄化率进行了预测。 相似文献
123.
124.
Heather Nachtmann Matthew A. Waller David W. Rieske 《Journal of Business Logistics》2010,31(1):149-158
The presence or absence of error in point‐of‐sale (POS) data and inventory system records directly affects retailer performance. This study identifies various error sources in retail supply chains and studies the influence of inventory and POS (demand) errors in a simulated retail outlet according to fill rate and average inventory. Other things being equal, we find that inventory record error reduces fill rate more than demand error. This study adds further evidence to other studies that suggest the costs caused by errors in POS systems may be overstated. 相似文献
125.
126.
分析在国内外会计准则下,通过固定资产重估提升银行资本、缓解监管压力的可行性。根据我国会计准则的相关要求,在固定资产重估方面,目前只能通过投资性房地产重估、固定资产转换与并购重组三种路径提升银行资本,从而达到提升资本充足率的目的,但前两种方法却在一定程度上降低了杠杆率水平,且其市场实施效果也并不乐观。 相似文献
127.
Nishith Prakash 《Feminist Economics》2013,19(4):267-308
ABSTRACTIllegal trafficking of girls results from their disadvantageous position in society, often reflected by preference for sons and neglect of daughters. India has both higher levels of illegal trafficking of girls and abnormal child sex ratios in favor of boys. This paper examines if the skewed sex ratio in India is associated with trafficking of girls. Using panel data from twenty-nine Indian states from 1980 to 2011, the study finds that a 100-unit increase in the child sex ratio is associated with a 0.635 percent increase in girl trafficking. Further, the association is heterogeneous by women’s empowerment, crime against women, and party rule in the state, and the association between the child sex ratio and trafficking of girls is stronger and larger in magnitude in states with greater women’s empowerment. Overall, it appears the results are driven both by greater reporting and a greater incidence of illegal girl trafficking. 相似文献
128.
Despite the various studies on creative tourism, little managerial frameworks such as a business model and a balanced scorecard are investigated for this new phenomenon. The overall image that emerges from the literature is ambiguous and fuzzy. Also, many activities known as creative tourism experiences may provide new participative experiences but rarely include a creative process. This study covers a whole aspect in designing a feasibility test model for creative experiences based on balanced scorecard through qualitative content analysis and as the essence of that, a Business Model by content validity and clustering analysis. Analysis of data by the mentioned methods reveals that four perspectives and 13 critical success factors are essential for the feasibility of a creative tourism experience. In addition, 22 indicators in 3 main dimensions determine the success of a creative tourism business model. This study is part of a growing body of research focused on discovering hidden aspects of creative tourism. 相似文献
129.
We consider estimation of panel data models with sample selection when the equation of interest contains endogenous explanatory variables as well as unobserved heterogeneity. Assuming that appropriate instruments are available, we propose several tests for selection bias and two estimation procedures that correct for selection in the presence of endogenous regressors. The tests are based on the fixed effects two-stage least squares estimator, thereby permitting arbitrary correlation between unobserved heterogeneity and explanatory variables. The first correction procedure is parametric and is valid under the assumption that the errors in the selection equation are normally distributed. The second procedure estimates the model parameters semiparametrically using series estimators. In the proposed testing and correction procedures, the error terms may be heterogeneously distributed and serially dependent in both selection and primary equations. Because these methods allow for a rather flexible structure of the error variance and do not impose any nonstandard assumptions on the conditional distributions of explanatory variables, they provide a useful alternative to the existing approaches presented in the literature. 相似文献
130.
我国区域金融结构转变与区域经济发展的实证分析 总被引:3,自引:0,他引:3
本文首先用格兰杰因果检验方法分析了我国区域金融结构转变与区域经济发展之间的关系,得出我国区域金融结构转变是被动的适应区域经济发展的结果,而不是导源于金融的自由化。然后针对分析结果提出优化我国区域金融结构的建议。 相似文献