小缺点

Linear Discriminant Analysis is one of the most popular linear projection techniques for feature extraction. The major drawback of applying LDA is that it often encounters the Small Sample Size problem. Besides, their optimization criteria is not directly related to the classification accuracy.

摘要线性判别分析是一种较为普遍的线性特征提取方法，它的主要缺点是在应用时经常遇到小样本问题，同时其准则函数并不与识别率直接相关。

The factory produced high-yield PCB powerful hammer crusher, stable quality, noise, high yield, easy maintenance, especially applicable to the processing and production of high-speed rail road paving stone, expected to greatly improve the shape of the jaw crusher is expected to film With the shortcomings.

本厂生产的PCB强效高产锤式破碎机，质量稳定，噪音小，产量高，维修方便，特别适用于加工生产高速路及铁路铺路石料、出料形状大大改善了颚式破碎出料是片状的缺点。

The modem new roll forming pipe systems remedy some defects of the traditional mills. They have lots of advantages such as meeting the productive in varied products, short time at changing the rollers, flexible and convenient adjustment, steady forming process and high qualities, etc.

现代新型的辊弯制管系统弥补了传统焊管成型机组的一些缺点，具有适应多种规格产品的生产，换辊时间短甚至不需要换辊，调整灵活方便，成型过程稳定，产品附加值高、质量好，同时轧辊磨损小，轧机能耗低等优势。

Since DDA is still under development, one of concerns is how to improve block displacement functions so that the block stress precision can be improved.

第四章进一步研究基于自然邻接点插值法的DDA方法，对比了其与移动最小二乘法的优劣，表明前者计算效率更高，缺点是需要处理特殊网格生成。

Periodic fluid pulsation in aeroplane hydraulic piping could induce fluid-construction vibration and lead to fatigue damage. It is impossible to find the error sensor's optimization location because of the pressure standing wave, and the pulsation attenuation effect is not perfect when adopting pulsation attenuation at single point. For this reason, a distributed active control method of fluid pulsation was presented. To avoid stationary point in all aviation states, several fluid pulsation actuators and error pressure sensors were placed along the piping. The second fluid pulsation produced by actuators can counteract the primary pulsation brought by aviation piston pump and make the mean pulsation of whole piping minimum when adopting adaptive feed- forward control and the filtered-X least mean square algorithm.

针对飞机液压能源管路系统中的周期性流体脉动诱发流固耦合振动，导致管路疲劳损伤的问题，针对管路中存在压力驻波特性，在采用单点消振时寻找误差传感器最佳布局位置困难而引起脉动抑制效果不理想的缺点，提出了一种分布式流体脉动主动控制方法，即沿管路不同位置布置多个主动消振阀和误差压力传感器，在任意飞行阶段，避开压力驻波点，以误差压力传感器的脉动测量值为控制目标，采用一种针对周期脉动主动控制的自适应前馈控制法和多通道自适应滤波－X LMS算法，调整控制器参数，使主动消振器产生的次级脉动与管路中的初始脉动相互抵消，达到整个管路中的平均流体脉动最小的效果。

Our solid tyre is especial in small rolling resistance,effectual to economize on fuel,not need to safeguard and maintain in the course of using,longe-lived,wear-resisting,bear the thorn to pitch,flexble to turn to,the vehicle openates steadily.lt overcomes the shortcomings such as pneumatic tyre inflating frequently,vehicle stability bad and unable bear the thorn to pitch.it is used to the mechanical vehicle of industey forkift truck,tractor,platform trailer ect.

该产品滚动阻力小，节油效果好，在使用过程中无需维护保养，使用寿命长，耐磨耐刺扎，转向灵活，车辆运行平稳。克服了充气轮胎需要经常充气，车辆稳定性差，不耐刺扎等缺点。主要是工业机械类车辆用胎（叉车、牵引车、平板拖车等），是冷冻库物流库、立体库，自动化流水线车间、石材加工厂、机械加工厂等特殊场地车辆的首选产品。

Encapsulant was driven by capillary force into the space between the chip and substrate. Underfill technique can protect the electrical device and prevent the device from destroying because of external force. Underfill has many defects including the fill time is too long, the situation of short shot and air trap are caused easily, the yield of product of Flip-Chip is not highest and the products are universal. Therefore, there are many factors being studied in this paper to sum up the influence of underfill of Flip-Chip process cause by model parameters.

覆晶接合技术为先进电子讯号连接技术中的一种，具有高I/O数、电子讯号路径短以及尺寸小等优点，而采用覆晶接合之电子元件大部分均以底部充填技术进行封装；底部充填是一种以毛细作用为驱动力在晶片与基板之间的间隙充填底胶的封装技术，可以确保晶片不受到外力的影响而损及封装体，但此技术具有充填时间长、容易产生短射与包风等缺点，使得覆晶封装制程良率不高，间接影响覆晶封装产品的普及率，因此本文将依各种可能之参数模型对覆晶封装底部充填制程的影响，以供业界参考。

At present, many tall buildings have been built in China because of the constant development of economy, a lot of large-scale civil buildings such as marketplace, office building, industrial building need long-span and heavy load structure. So the traditional prefabricate structure has been already unable to satisfy the constant increasing need because of the shortcomings of short-span and low intensity concrete. If we don"t change the performance of the former prefabricate structure, it will be very swift that the prefabricate structure will be eliminated. Besides, the commodity concrete"s high development, the technology of concrete pump sending popularization and the development of nobonded presterss technology accelerate the shrink of prefabricate structure.

当前，我国由于随着经济的不断发展，高层建筑大量兴起，很多大型民用建筑如商场、写字楼、工业厂房等楼面都需要大跨、重载的楼板结构，因此传统的预制板由于适合跨度小、混凝土强度低等一些缺点，已无法满足不断发展的需要，如不改进原有预制构件的材料性能，将很快被淘汰，而且由于商品混凝土的飞速发展、混凝土泵送技术的推广及无粘结预应力技术的发展更加速了预制构件的萎缩。

Combination of high-strength composite resin with titanium to make fixed or removable partial denture had many advantages.

硬质复合树脂与钛联合使用制作固定或活动义齿，既可以利用钛生物相容性好、机械强度高、比重小的优点，避免其它非贵齿科合金(Co-Cr、Ni-Cr合金)的潜在生物毒性；又可以避免烤瓷硬度过大对对牙合牙的过度磨耗以及崩瓷后不易修复的缺点。

Its Huxing Take Sanju, 40 home-based; Central House is the type of small high-style, high-density residential communities to improve the shortcomings.

其户型就以三居、四居为主；中部风格雅园则是板式小高层，改善了大社区高密度住宅的缺点。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。