Sybase数据库的磁盘镜像及故障恢复机制

数据库的可靠性是权衡数据库系统安全性的重要指标 ,数据库容错技术和有关故障 (包括系统故障、存储介质故障 )恢复决定了信息系统设计的规模和性能 ,特别是随着系统大型化 ,对数据库系统的联机处理性能提出了较高的要求 ,在故障恢复期间仍需具备一定的在线恢复 ( Non-Stop Recovery)能力。本文从故障恢复、磁盘镜像等方面讨论了Sybase数据库的有关机制     

Intraday Lead-Lag Relationships Between the Futures-, Options and Stock Market

In rational, efficiently functioning and complete markets, returns on derivative and underlying securities should be perfectly contemporaneously correlated. Due to market imperfections, one of these markets may reflect information faster. The use of high-frequency data and the choice for a small unit time interval to measure these lead-lag relations comes at the cost of some or many missing observations, causing traditional estimators to either under- or overestimate covariances and correlations. We use a new estimator to estimate lead-lag relationships between the cash AEX index, options and futures. We find that futures returns lead both options and cash index returns by approximately 10 minutes. The relationship between options and the cash market is not completely unidirectional.     

DIRECT RESONANCE OF TURBULENT BOUNDARY LAVER OVER COMPLIANT WALLS

１．　ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｍａｉｎｇｏａｌｏｆｔｈｉｓｐａｐｅｒｉｓｔｏｅｘｐｌｏｒｅｔｈｅｐｏｓｓｉｂｉｌｉｔｙｔｏｌｅａｒｎｍｏｒｅａｂｏｕｔｔｈｅｍｅｃｈａｎｉｓｍｏｆｔｕｒｂｕｌｅｎｔｂｏｕｎｄａｒｙｌａｙｅｒｆｌｏｗｉｎｔｅｒａｃｔｉｏｎｓａｎｄｉｔｓｅｆｆｅｃｔｓｏｎｃｏｍｐｌｉａｎｔｗａｌｌｐｅｒｆｏｒｍａｎｃｅ．Ｔｈｅｒｅａｒｅｃｅｒｔａｉｎｐｒｅｒｅｑｕｉｓｉｔｅｃｏｎｄｉｔｉｏｎｓｔｏｆｕｒｔｈｅｒｔｈｅｓｔｕｄｙｏｎｔｈｅｍｅｃｈａｎｉｓｍ，ｉ．ｅ．ｔｈｅｃｏ…     

三峡水库减淤增容调度方式研究——多汛限水位调度方案

本文建议在汛期中小流量时（Q<35000m3/s），将坝前水位维持在148～151m；出现汛情且流量更较大后，将坝前水位降低到143m；入库流量大于35000m3/s且短期预报将出现大于十年一遇洪水时，预泄洪水到135m.按这一调度，汛期约80％时间可以维持在较高水位，一般洪水期。汛限水位143m不影响坝区通航，135m水位迎洪可大量增加防洪库客。到100年后可减淤30亿m3，增加防洪库容约40亿m3.变动回水区减淤40%，优化了坝区水沙搭配，可改善通航条件。降低库区洪水位，缓解防洪与移民的矛盾。可对发电带来较大好处：提高发电效益，减少粗沙过机。初期水库排沙比大于原方案，可减轻下游冲刷。同时，可减小三峡汛初泄水与鄱阳湖防洪的矛盾。     

Programme Evaluation with Unobserved Heterogeneity and Selective Implementation: The Mexican PROGRESA Impact on Child Nutrition

This paper considers the impact of Programa de Educación, Salud y Alimentación ( PROGRESA ), a large Mexican rural anti-poverty programme that had an evaluation sample in which overall treatment was randomly assigned to some communities but not others, on child nutrition. When we examine the impact of PROGRESA based on the presumption of randomized allocations, we find that PROGRESA had no or even a negative impact on child nutrition. However, not all children designated to receive nutritional supplements actually did so. Our preferred estimates – child fixed-effects estimates that control for unobserved heterogeneity that is correlated with access to the supplement – indicate a significantly positive and fairly substantial programme effect of the nutritional supplements on children 12–36 months. They imply an increase of about a sixth in mean growth per year for these children and a lower probability of stunting. Effects are somewhat larger for children from poorer communities but whose mothers are functionally literate. The long-term consequences of these improvements are non-trivial; its impact working through adult height alone could result in a 2.9% increase in lifetime earnings.     

对纳税筹划问题的理性思考

纳税筹划近年来日益受到人们的关注,但国内研究多侧重于筹划策略和方法。本文试图从理论上对纳税筹划的必然性、可能性及其经济和社会效应进行较深入的探讨,完善纳税筹划的指导思想,纠正对其错误的认识。     

高等教育的国际贸易性及其决定因素

高等教育具有多种社会属性,高等教育的国际贸易性反映着高等教育与生产交换的一种关系,是高等教育国际服务贸易理论研究中的基础性问题。高等教育贸易性,是指高等教育服务进入国际市场交易的可能性与可行性,即参与国际贸易的潜在能力和可贸易程度。其决定因素有产业性因素、比较性因素、技术性因素和制度性因素。     

会计电算化使用方法和技巧

本文作者通过三年多时间对会计电算化的使用和摸索,提出了一些会计电算化的使用方法和技巧,供企事业单位的会计工作者参考和借鉴.     

会计监督与审计监督的不可替代性与互补性研究

会计监督与审计监督虽然同属于经济监督体系,但是又有各自独立的体系,它们在经济监督中所产生的作用有所不同。本文从企业内部的角度探讨了会计监督与审计监督的不可替代性和互补性,明确了两者的关系,才能为企业内部开展经济监督提供可靠的依据。     

中小企业生存理论及分析

中小企业在各国经济中起着越来越重要的作用,已成为扩大就业,增加收入,促进经济增长的重要手段。本文分析了国际上具有代表性的中小企业生存理论,从理论上论证了中小企业存在与发展的可能性与合理性,对于纠正长期以来形成的歧视中小企业的错误观念,促进中小企业的健康发展有着积极的意义。