数据挖掘在CRM中的应用

本文介绍了数据挖掘技术与CRM,在此基础上提出了数据挖掘在CRM中的一些应用,最后对数据挖掘的发展方向及其在CRM中的应用前景作了展望。     

分布式仿真中实时网络通讯技术研究

该文分析了提高对网络通讯实时性五项技术措施。利用软件编程技术实现仿真计算机之间的时钟同步,并建立多任务多进程并发通讯机制以及介于ＴＣＰ／ＩＰ和ＵＤＰ／ＩＰ之间的中间传输协议支持技术,从而保证网络仿真环境的畅通无阻和交互信息的实时传输。     

SPI总线的UART扩展方法

借助于微处理器的SPI总线接口,利用NXP公司的一款芯片SC16IS752,提出一种基于SPI转UART的软硬件设计方案;着重介绍SPI-UART转换原理,并结合实际的应用系统,讨论了整个设计的可行性和实用性.实际应用表明,该方案经济、实用.     

已有ORACLE系统的性能调整优化

引起ＯＲＡＣＬＥ应用系统效率低下的原因很复杂,而对ＯＲＡＣＬＥ的优化过多集中于应用程序的设计优化,该文通过讨论和研究 Ｏｒａｃｌｅ服务器的特征和在逻辑、物理和变化上的特点,分析了造成 ＯＲＡＣＬＥ系统性能低下的原因,并阐述了在不改动应用程序的情况下,提高、调整Ｏｒａｃｌｅ系统性能的一些原则和方法。     

Analysis of thermal fatigue behaviour of brittle structural materials

The effect of the level of maximum temperature (T _max), the temperature range (T) and the mode of convective heat transfer on the thermal fatigue resistance of brittle structural materials is analysed. Expressions are derived for the number of thermal cycles to failure in terms of the appropriate mechanical and thermal properties, crack growth parameter, T andT _max. For simultaneous changes inT _max and T commonly used in practice, the change in thermal fatigue life is governed by both the thermal stress intensity exponent (n) and the activation energy (Q) for subcritical crack growth, in contrast to the results of other studies. For constantT _max but variable T, thermal fatigue life is affected byn only, whereas, for constant T but variableT _max, the value ofQ alone governs changes in fatigue-life. Heat transfer by natural or forced convection will result in differences in thermal fatigue resistance. Recommendations are made for the design and analysis of thermal fatigue experiments. Figures-of-merit for the selection of materials with high thermal fatigue resistance are presented.     

自贸区视野下的洋山港集疏运体系完善路径

洋山港是上海国际航运中心建设的重要载体,其区域内的保税港区也是上海自由贸易试验区的重要组成部分,因此洋山港区的集疏运体系是影响港口效率和发展前景的关键之一。鉴于目前洋山港区集疏运体系在实际运作中存在的运输比例、公路运输、海铁联运、短驳中转等方面的问题,大力提高公路运力、完善和深化海铁联运模式、加快配套内河航道规划和建设、深挖穿梭巴士运能、加强信息管理网络建设等的对策建议,有助于进一步拓展和发挥洋山国际深水大港对上海国际航运中心建设中的核心功能。     

水库大坝安全监测法规及技术标准研究

大坝安全监测是水库大坝安全管理工作的重要组成部分,大坝安全监测法规和技术标准是大坝安全监测工作的依据,对提高大坝安全监测工作的有效性具有十分重要的意义。通过对现行大坝水库法规、规章及规范性文件、技术标准进行系统分析,指出其特点和不足,并给出下一步工作的建议,从而为更好地理解相关规范奠定了基础,也为规范的修订和完善提供了参考。     

稠油底水油藏生产压差值对采收率的影响

研究生产压差对稠油底水油藏采收率的影响。结果表明:波及系数随着生产压差的增大而增大,最终趋于稳定;驱油效率随着生产压差的增大而减小,最终趋于稳定;采收率随着生产压差增大开始有小幅上升,但是增加到一定程度后,采收率开始小幅下降;生产压差对生产时间影响较大,生产时间随生产压差的增大以指数方式下降;稠油底水油藏采收率和生产时间,生产压差与其之间存在最大合理生产压差;针对海上油田开发高风险、高投入的特点,适当放大生产压差高速开采稠油底水油藏的开发方式是可行的。     

Microstructural evolution and mechanism of grain growth in magnesia ceramics prepared by high pressure and temperature with ultra-high heating rate

The fast densification method of combustion reaction plus quick pressing was adopted to prepare nanocrystalline ceramics.The densification process of magnesia compact with a particle size of 100 nm was investigated,under the applied pressure of up to 170 MPa,and the temperature range of 1740–2080 K with ultra-high heating rate(above 1700 K/min).High-purity magnesia ceramics with a relative density of 98.8%and an average grain size of 120 nm was obtained at 1740 K,and the grain growth during the densification process was effectively restrained.The characteristic morphology of evaporation-condensation was observed in the compact prepared at 2080 K,which revealed the actual process of mass transfer by gas diffusion.Moreover,the investigation on the microstructure evolution and mechanism of grain growth was carried out,on the basis of as-preserved nanocrystalline ceramics.The result indicated that the grain growth of the nanocrystalline MgO was controlled by the mechanism of evaporation-condensation rather than surface diffusion.Furthermore,the pressure had an influence of restraining the grain growth based on solid diffusion and strengthening the effect of gas diffusion with the increasing temperature.Under the particular conditions,there existed an appropriate temperature for the densification of nanocrystalline magnesia,while the excessive temperature would exaggerate grain growth and impede densification.     

再入飞行器横侧向耦合多变量姿态控制技术研究

结合多变量控制理论和定量反馈理论(QFT),设计了飞行器的横侧向耦合多变量姿态控制系统。通过飞行器的飞行仿真表明,多变量控制系统可以在存在较大不确定性的情况下,确保对横侧向指令进行精确跟踪,具有较强的鲁棒性。针对高速再入飞行器的弱气动条件下偏航控制不理想的问题,充分利用飞行器的多变量特性,利用副翼对偏航的耦合影响,用以协调控制偏航通道的姿态角。仿真结果表明,该方法达到了优化偏航通道控制的目的。