A inter - frame error concealment algorithm based on motion estimation is proposed in this dissertation , the motion vectors and coding mode can be rebuilt , it can be applied in any frame modes and macroblock modes 本文提出了基于运动估值的帧间预测错误隐藏算法，能对运动矢量和编码模式的进行有效重建，适应各种情况的帧间错误隐藏。
While two ( or more ) electromagnetic waves of the same frequency , same direction of vibration , same phase or constant phase difference superpose in space , the amplitude of composite wave is vector sum of the amplitude of each wave 由两个（或两个以上）频率、振动方向相同、相位相同或相位差恒定的电磁波在空间叠加时，合成波振幅为各个波的振幅的矢量和。
To reduce the runtime of the software , fast algorithms are adopted in the motion estimation and dct modules . moreover , this paper introduces early detection of zero motion vector and all zero coefficients to optimize the coding process 为了提高软件运行速度，对运算时间较长的运动估计和dct模块采用快速算法，并对编码过程进行优化，采用了零运动矢量和零系数提前判决的方法，节省了很大一部分块匹配搜索和dct运算时间。
2 . the principle that cylinder misfire is diagnosed using torsional vibration harmonic analysis is illustrated by calculation of vectorsummation . calculation and experiment show : low harmonic will increase highly and main harmonic will decrease little when one cylinder is misfiring 通过对扭振激励的相对振幅矢量和的仿真和实验研究，得到结论如下：如果柴油机发生单缸熄火故障，扭振低谐次幅值会大幅度增加，主简谐会略有下降。
Based on the three new supposition and the tow new mechanical tools : moment vector and radius vector , the warping theory introduced the analytical method of the rotation of a cross section around a fixed axis , so as to make the space stability of the thin - walled member complanate and one - dimensioned 翘曲理论以三条新的假定和新建立的弯矩矢量和转角向径两大力学工具为基础，提出了绕定轴转动的分析方法，使薄壁构件的空间变形平面化、一维化。
We presented a novel method of searching for similar fragments of 3d curves , with this method , a hash vector is associated with each fixed - length fragments of 3d sherd . each vector consists of low frequence component of fourier - like spectrum for the distance between profile curve and the centroid 讨论了基于hash矢量和fourier变换的轮廓曲线匹配方法，在匹配中不要求一段轮廓线与另外一段轮廓线完全匹配，而是把它们分成很多子段，再用这些子段来进行匹配。
Results the doppler spectrum of the combined motion of the chamber and the fluid was the vector sum of their doppler signals . conclusion cardiac motion alters the doppler signal derived from blood flow and this effect should be considered in the doppler flow velocity measurement 结论通常所谓的血流速度频谱实际上是血细胞在心脏内流动速度和心脏运动速度的矢量和，即两项运动的复合频谱，所以，为减少误差，在用多普勒血流速度频谱测定血流参数时，应考虑校正问题。
This paper makes the feasibility design and study of the dtc ( direct torque control ) system based on analyzing some important parts , such as the arithmetic model of asynchronous motor in - coordinates , the choice of voltage vectors , and flux - linkages models , etc . the research work in this paper is described as follows : 1 analyzing of the dtc theory : material about the development and theory of dtc , the composing of dtc - system are presented in this paper 本文在详细分析了定子坐标系下的异步电动机数学模型、电压空间矢量和磁链观测器的基础上，利用直接转矩控制技术，构建了基于dsp的直接转矩控制系统。论文的主要工作包括以下三个方面： 1直接转矩理论分析研究：针对直接转矩控制理论在低速范围转矩观测器和转速波动等问题，采取了滞环模式切换，矢量细分等改进措施。
Based on the discussion of the definition of the employee performance , the authors have developed a vector model to analyze the performance of the employee in a vectorial and geometric form , which makes the conclusions of performance appraisal not the simple numerical value scores , and they can distribute in a vectorial space and combine with numerical values and directions 摘要文章探讨了员工绩效的定义，并在此基础上开发出一个矢量分析模型，对员工绩效进行矢量和图形处理，使绩效结论不再是简单的数值得分，而是兼有数值和方向的、在矢量空间内分布的矢量点。
The research on autonomous navigation and orbital keeping technology of geosynchronous satellites : selecting position vector in the inertia space and longitude , latitude , radial errors in the hill equation as state variables , the precision of orbit determination caused by track dynamic model error , sampling period , and sensor measurement and install error is analyzed 同步卫星自主导航与轨道保持技术研究：分别选取惯性空间位置矢量和采用hill方程表示的经、纬、向径误差作为状态量，分析轨道动力学模型误差、采样周期以及敏感器测量、安装等误差对定轨精度的影响。
