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The error of ultimate load prediction of un-reinforced brick arch: brick arch will be simplified to portal frame are used to preliminary estimation, in-plane stiffness which only provides from vertical frame, the average error between -20~20%;Structure program are used to simulate brick arch with shell elements analyzed, the average error between -15%~10%.

未补强砖拱，其水平极限荷载预测之误差：推估公式中将砖拱简化为门形构架，其面内刚由垂直构材提供，平均误差在-20~20%之间；结构分析程式中将砖拱以壳元素模拟，平均误差在-15~10%之间。

Simulation result shows that the alignment accuracy was 5' for east direction maladjustment angle error, 2' north direction maladjustment angle error, and 6' for azimuth maladjustment angle Error.

仿真结果表明该方案的对准精度(1σ)可以达到东向失准角误差为5角分，北向失准角误差为2角分，方位失准角误差为6角分。

The result indicates, under the condition of big initial error and shell"s high speed rolling, after 60 seconds" flight alignment, the error of azimuth angle and attitude angle can be decreased to no more than 10 angle second, and the position and velocity error has been corrected. This shows the effective of our designed arithmetic.

研究结果表明：在初始误差较大、弹体高速旋转的条件下，经过60秒的空中对准，三个姿态角误差可降至10个角秒以下，同时位置和速度误差得到了修正，从而验证了算法的有效性。

Moreover, the accuracy analysis for different measurements and parameters(such as time measure error, azimuth measure error, buoys error, baseline length and sound velocity fluctuation) are given respectively. To make the best use of the observation datas, the weighted least square localization algorithm is used to improve the accuracy in bistatic sonar. The simulation results show that the positioning accuracy of this algorithm is higher than the other four algorithms, with which the positioning accuracy in stations areas and side areas can be improved effectively.

同时，通过对系统各个因素，如系统的各观测量的测量误差、站址误差、基线长度、声速波动等参数对算法性能的影响，得出了各方法定位误差的分布规律；为了充分利用双基地声纳系统的观测数据，提高系统的定位精度，采用加权最小二乘方法对系统的数据进行优化处理，仿真结果表明该方法定位精度明显高于基本方法的定位精度，能有效的改善发射站和接受站侧边区的定位精度，且定位性能受站址测量误差的影响较小。

A new bridge deflection measurement method was proposed, in which the geometric information of co-operant was acquired by using the surveying robot. The angle measurement precision and the distance measurement precision of surveying robot were analysed from two perspectives of systematic error and random error. The measurement error analysis was done by considering the effect of the vertical angle and stadia. Measurement precision of the method was analysed in the least square principle.

提出了一种以测量机器人为采集器，通过获取合作目标的几何信息进行桥梁挠度测量的新方法，从测量系统误差、偶然误差两个方面分析了测量机器人的测角及测距误差，并探讨了竖直角、视距付挠度测量误差的影响，同时依据最小二乘原理分析了该方法的测量精度。

Adopt project practical quaternion algorithm of strapdown navigation system, Analyze systematic error source, emulation prove the output change of SINS in there is device error of inertia and the initial condition of collimation error.

采用了工程上实用的四元数捷联导航系统的算法，分析了系统误差源，仿真验证了捷联惯导系统在有惯性器件误差及初始对准误差情况下的输出变化。

On line correction of setup error using EPID in order to reduce systematic error and random error and then improve setup precision.

在EPID系统下进行实时摆位误差纠正，可进一步降低摆位系统误差和随机误差，提高摆位精度。

In the traditional AdaBoost method,the weights are updated based on the weak classifier's overall error rate, this article proposes one kind of the method which unifies the level of difference between the threshold and the feature value of the weak classifier with the weak classifier's overall error rate. Compared to the method which only based on the overall classification error rate to update the weights,this method can achieve higher detection rate while reduces the mistaken-detection rate.

在传统AdaBoost方法中，权重是根据弱分类器的整体错误率来更新的，本文提出了一种将弱分类器的阈值与特征值相差程度和弱分类器的整体错误率相结合来更新样本权重的方法，相比较只根据整体分类错误率来进行权重更新的方法，这种方法可以在降低误检率的同时达到较高的检测率。

According to the diffraction theory used in DVD system, we propose a new theory to analyze the RF signal and tracking error signal of Super-RENS disk. Then we use simulate the tracking error signal under beam aberration. Finally we use FDTD method to simulate the tracking error signal at defocus.

我们亦根据传统光碟片的绕射理论，提出一新的架构用於分析此近场结构，并用此理论进行射频及偏轨信号的模拟；接著探讨在有像差产生的情形下，其对偏轨信号的影响，最后用有限时域差分法验证在失焦下，偏轨信号的变化。

From the experiment and analysis, it can be seen that friction limits realization of high accuracy electro-hydraulic position servo system, movement of any gimbal brings disturbance moment to servo system of other gimbals and the disturbance moment causes error, and, resolution ratio error and setting error of feedback measurement element are directly added to servo system output.

通过实验和仿真可以看出，摩擦阻碍了转台电液位置伺服系统商精度控制的实现，任何一个框架的运动都会对其余框架的伺服驱动系统产生干扰力矩并引起伺服系统误差，反馈测量元件的分辨率误差和安装误差直接反映在伺服系统输出上，对伺服系统的精度有直接影响。

We were supposed to participate in a siege of this unit.

当然我们也参加了围困这支部队的任务。

Sometimes we eat pomelos.

有时我们也会吃柚子。