异构设备互连网中数据库变化的实时响应

将实时变化的数据传递给数据库及相关的用户程序，以实现互连网中异构设备的实时响应．     

Segmentation of moving observer frame sequences

This note presents a technique for the segmentation of dynamic scenes obtained using a moving camera. Using the motion of the observer the frame sequence is transformed into a polar frame sequence. It is shown that segmentation and extraction of motion information becomes computationally simpler in the Ego-Motion Polar (EMP) frame sequence.     

高压开关产品3D零部件库系统的设计与开发

为了有效快捷地管理、重用零部件,并进行相应的信息集成和变形设计,笔者以GW-126型户外高压隔离开关为例,针对企业设计部门,研究并开发了基于C/S架构的多属性映射的零部件库系统,实现对零部件的有效分类、动态管理、信息集成及重用和变形设计。同时结合二次开发技术实现该系统与Inventor2008设计软件的无缝集成,提高系统的运行效率,大大提高了设计效率,缩短了产品开发周期。     

ITRI‐WiMAXT: A WiMAX conformance testing tool

The WiMAX Forum certifies and promotes the compatibility and interoperability of broadband wireless products where many testcases need to be developed for WiMAX procedures. In this paper, we develop a conformance test tool called ITRI‐WiMAXT based on the TTCN‐3 specifications. Then we show how WiMAX procedures are tested in ITRI‐WiMAXT. Based on ITRI‐WiMAXT, we have proposed several test procedures accepted by the WiMAX Forum. Copyright © 2009 John Wiley & Sons, Ltd.     

Relationships between milk protein composition, milk protein variants, and cow fertility traits in Dutch Holstein-Friesian cattle

Selective breeding can change milk protein composition to improve the manufacturing properties of milk. However, the effects of such breeding strategies on other economically important traits should be investigated before implementation. The objectives of this study were to examine the association between cow fertility traits and (1) milk protein composition and (2) milk protein variants (β-lactoglobulin, β-casein, κ-casein, and β-κ-casein) in commercial Dutch Holstein-Friesian cattle. Data on 1,644 first-lactation cows were analyzed by fitting linear mixed models. Greater relative concentration of α_S1-casein within total milk protein had a positive phenotypic relationship with nonreturn rates and calving rate after first insemination. Furthermore, results showed virtually no significant relationship between cow fertility and concentration of other milk proteins or milk protein variants. Results of this study can be used to assess the correlated effects of breeding for improved milk protein composition on reproduction, thereby allowing for better evaluation of breeding programs before implementation. Our findings suggest that selecting cows based on milk protein composition or milk protein variants for improved manufacturing properties would have no negative influence on reproductive performance.     

运用Pro/ENGINEER 进行机柜参数化设计

简要介绍了使用Pro／ENGINEER进行机柜参数化设计的过程。并通过对机柜参数化模型的变型试验,验证了机柜参数化设计的可行性。     

频变耦合双通带滤波器的综合方法

为了解决频变耦合双通带滤波器缺少有效综合方法的问题,文中提出一种优化综合方法.该方法首先通过频率变换技术得到滤波器在归一化双通带域内的特征多项式,然后应用经典的耦合矩阵综合方法得到双通带滤波器的全规范耦合矩阵,进而以矩阵的特征值为趋近目标构造目标函数,最后应用梯度优化算法进行优化获得了双通带滤波器的频变耦合矩阵.文中对...     

基于版本的教学任务管理系统的设计

针对教学任务管理的现状,提出了基于版本的教学任务管理的设计方案.根据数据的生存周期,优化教学任务管理流程,给出了数据库设计方案,提出C/S和B/S组合实现方法.最后给出应用案例.     

多孔质气体止推轴承跨缝过程时变特性研究

针对某大型超平气浮支撑平台上卫星模拟器所使用的多孔质气体止推轴承,在跨越气浮平台的拼缝过程中存在的运动卡滞和自激振动问题,建立多孔质轴承气体润滑理论模型,考察气体轴承的稳态特性;使用有限元法分析多孔质气体轴承通过拼缝时的动态时变特性,并分析压力分布、承载能力、倾覆力矩的变化。结果表明:平台拼缝间隙的存在对多孔质气体止推轴承压力分布造成了较大的影响,导致跨缝过程中其承载能力大幅降低,从而造成轴承表面划伤,因此在轴承的设计选用中应留有较多的承载余量;多孔质气体止推轴承在跨峰过程中,在其运动方向上存在呈正弦波动的倾覆力矩,但对其正常使用不会造成影响。