一种静态LoC关键性预测器设计

针对不同分簇超标量处理器结构下SPEC2000程序中指令关键可能性(LoC)的特性,提出一种静态LoC关键性预测器的设计方法。对指令LoC进行研究,根据其结构无关性和动态不变性,设计预测器。仿真结果表明,在对1×8分簇超标量处理器使用该设计时,程序的每周期指令数平均提升5.3%,性能优于动态LoC预测器。     

一种基于小波变换的校园网流量预测方法研究

流量预测是实现网络管理与控制的重要前提。通过介绍网络流量特征,描述了网络流量预测基础理论,将神经网络与小波变换相结合,设计出一种紧致型小波神经网络流量预测算法,采用真实校园网流量数据对所提算法进行实验分析,并与相关方法进行对比。实验结果表明该算法是有效的。     

大型浮体水弹性作用的频域分析

对大型浮体水弹性响应的频域计算方法做了综述和介绍。分别介绍了干模态法、湿模态法和直接计算方法,对于干模态法的五种结构弹性模态函数做了介绍,研究了五种模态函数下计算结果的收敛速度。对于水动力分析方法的计算量和存储量做了分析,介绍了降低计算量和存储量的一些新计算方法,实现了一种柱坐标下的多极子展开高阶边界元方法,积分方程中的固角系数和柯西主值积分均采用直接方法计算,应用该方法计算了波浪与大型弹性浮体的相互作用问题,计算结果与实验值得到很好的吻合。     

生产工艺对低碳铝镇静钢热镀锌钢板性能的影响

以在普通热镀锌线生产低碳铝镇静钢深冲热镀锌板为目标,根据CQ、DQ级热镀锌板生产线的工艺特点,设计了以前罩式退火和后罩式退火生产深冲热镀锌板的工艺方案,分别研究了2种工艺对低碳铝镇静钢热镀锌板性能的影响.结果表明:由于低碳铝镇静钢在前罩式退火时会形成强的{111}织构,可以生产性能良好的深冲热镀锌板;后罩式退火也可以改善低碳铝镇静钢热镀锌板的性能,但其冲压性能主要取决于后罩式退火前的各工序.     

深井巷道围岩应力场、应变场和温度场耦合作用研究

建立了耦合条件下岩体的应力-应变关系,推导出不同变温范围条件下巷道围岩的应力和应变.实例计算表明:巷道围岩在耦合情况下比非耦合情况下的切向应力、周边位移、破碎区和塑性区半径都有较大的增加,并提出了提高耦合条件下改善巷道围岩体稳定性的措施.     

纸盒模切版留桥软件设计

介绍了纸盒模切版留桥设计的必要性,阐述了用图论中的相关理论建立数学模型及实现模切版留桥自动设计软件的开发方法.     

Explicit local buckling analysis and design of fiber–reinforced plastic composite structural shapes

Pultruded fiber–reinforced plastic (FRP) composite structural shapes (beams and columns) are thin-walled open or closed sections consisting of assemblies of flat plates and commonly made of E-glass fiber and either polyester or vinylester resins. Due to high strength-to-stiffness ratio of composites and thin-walled sectional geometry of FRP shapes, buckling is the most likely mode of failure before material failure. In this paper, explicit analyses of local buckling of rectangular orthotropic composite plates with various unloaded edge boundary conditions (i.e., (1) rotationally restrained along both unloaded edges (RR), and (2) one rotationally restrained and the other free along the unloaded edges (RF)) and subjected to uniform in-plane axial action at simply-supported loaded edges are first presented. A variational formulation of the Ritz method is used to establish an eigenvalue problem, and explicit solutions of plate local buckling coefficients in term of the rotational restraint stiffness (k) are obtained. The two cases of rotationally restrained plates (i.e., the RR and RF plates) are further treated as discrete plates of closed and open sections, and by considering the effect of elastic restraints at the joint connections of flanges and webs, the local buckling of different FRP shapes under uniform axial compression is studied. The approximate expressions of the rotational restraint stiffness (k) for various common FRP sections are provided, and their application to sectional local buckling predictions is illustrated. The explicit local buckling formulas of rotationally restrained plates are validated with the exact transcendental solutions. The analytical predictions for local buckling of various FRP profiles based on the present discrete plate analysis and considering the elastic restraints of the flange–web connections are in excellent agreements with available experimental results and finite element eigenvalue analyses. A design guideline for local buckling prediction and related performance improvement is proposed. The present explicit formulation can be applied effectively to determine the local buckling capacities of composite plates with elastic restraints along the unloaded edges and can be further used to predict the local buckling strength of FRP shapes.     

基于Web的虚拟旅游系统

结合认知心理学、旅游心理学的研究成果，分析网上虚拟旅游发展的现状，提出虚拟旅游系统的功能及技术需求，并在此基础上设计一套JSP模式架构的虚拟旅游系统。系统划分为虚拟场景漫游、交流讨论区、网上购物区、系统管理维护4等个功能模块，其中虚拟场景漫游是该系统的核心模块。针对Java3D技术在核心模块开发中的应用展开重点讨论。     

PLC在培训仿真机中的应用

该文给出了一个松下PLC在培训仿真机系统中的应用实例。介绍了整个仿真机系统的硬件和软件设计的基本思路和方法。在软件设计中特别分析了普通计算机和PLC之间基于串行通讯接口实现实时数据交换的方法。     

金色梦幻

西部什么最迷人?肯定地说:高原的金黄色. 　　黄色,本是彩色世界的一种基色,少了它就无法构成彩色,这种色调难道不是西北的核心部分?多了它也不显得多余,少了它就是种残缺.无数黄色拥挤在这儿也不觉得拥挤,没有它,岂不是种单调?……