平均误差

Simulation results demonstrate that the average one-hop distance is estimated more exactly in the proposed algorithm than that of DV-Hop, the root mean square error is decreased and the location precision is improved.

仿真结果表明，与DV-Hop算法的平均跳距离估计算法相比，本文算法更准确地估计平均跳距离，降低了均方根误差，并提高了定位精度。

An improved scheduling method based on exponential division of deadline is presented after study on the problem of prevenient average division of deadline method in this paper.The paper also proves when the relative deadline of each node is too large,the schedular performance of messages transmission task using average division of deadline will be decreased by introducing notion of quantization cost.The new method solves the problem well,and digital simulation validate the new method.

摘 要：针对平均分区的EDF算法在CAN总线中的应用出现的问题，本文提出了一种改进的基于指数分区的EDF算法，并通过引入量化误差的概念，推导证明当CAN网络中各节点相对截至期分布时间过大时，平均分区的EDF算法会导致CAN总线中信息传输任务可调度性的下降，而基于指数分区的EDF算法保证了信息传输任务的实时性，仿真试验验证了算法的有效性。

Then we used spot 3 to test the performance of the network, at the same time, two other networks were built for comparation with the BBP network we have set.

结果表明，网络训练集的相关性达0.8867，平均绝对误差和平均绝对方差分别为15.07和377.4，确证集两组数据的预测精度为3.5%和16.5%。

The relative error of accuracy is 0.21%, the precision of relative windage is 0.24%, and the recovery rate is 99.93%.

其准确度平均相对误差为0.21%，精密度平均相对偏差为0.24%，方法回收率为99.93%。

In the intersatellite coherent optical communication, the vibration of a satellite will lead to a pointing error of transmitting and receiving antennas, which will decrease the signal-to-noise ratio and increase the bit error rate. In this paper, the Rayleigh distribution is taken as the pointing error model caused by satellite vibration, and PSK homodyne communication scheme is used as an example to analyze the influence of the satellite vibration on the system instantaneous BER and average BER. The simulation calculation result of BER is given.

针对星间相干激光通信中卫星平台的振动造成发射天线和接收天线的瞄准角误差，使系统信号信噪比下降，误码率增加，该文以瑞利分布作为振动造成的瞄准角误差模型，结合高斯本振光和艾里信号光外差检测模型，以PSK零差通信体制为例分析卫星振动对系统的瞬时误码率和平均误码率的影响，给出误码率仿真计算结果。

The algorithm has some problems, such as bias problem, aliasing problem and one problem that affects none-shade part of image and is caused by Gaussian blur. To solve these problems, this paper makes some improvement on the algorithm. Firstly, it uses the Woos average depth principle and PCF algorithm to solving bias problem and aliasing problem; secondly, it designs and implements an effective method to control the range of blur; thirdly, it adapts any size texture to story information. This method for keeping information plays important part on raising realistic graphic; fourthly, it takes use of the technology of programmable graphics hardware and the method of FBO to improve efficiency of algorithm.

由于基于高斯模糊的阴影算法存在阴影走样、量化误差和高斯模糊影响非阴影部分图像等问题，因此本文从以下几个方面对算法进行了改进：第一，在算法中添加了woo的平均深度值原理和PCF算法，改善了量化误差和阴影走样问题；第二，设计并实现了一种方法，有效地控制了高斯模糊的范围，提高了三维图形的真实感；第三，使用任意大小的纹理进行存储，提高了阴影的真实感；第四，通过可编程图形硬件技术的应用，提高了算法的运行速度。

The results show that at close distances, the field waveform is dependent strongly on azimuth; at distance of several hundreds, the ratio of the peak error values at two azimuths may be bigger than 2; at the distance of 1 km, the mean error is less than 10% with a maximum value of 50%.

结果表明，回击电磁场随方位角的变化非常明显，在距闪电通道几百米距离，误差可达2倍；在1 km处，闪电通道的垂直假定对时域回击辐射场峰值计算的相对误差最大为50%左右，平均小于10%。

In the conventional CMAC learning scheme, the correcting amounts of errors are equally distributed into all addressed hypercubes, regardless the credibility of those hypercubes. The proposed improved learning approach uses the learned times of the addressed hypercubes as the credibility of the learned values.

在常规的CMAC中，误差的校正值被平均地分配给所有启动存储单元，而不管这些存储单元的可信度；在改进的CMAC中，利用激活单元先前学习次数作为可信度，其误差校正值与激活单元先前学习次数的负k次方成比例。

This method can make reasonable and timely decisions based on the kinds and precision of forecast information in the course of the rain and flood from occur and develop to recession without decreasing the design flood prevention standard. Being make full use of forecast infor...

该方法考虑了预报误差的规律，能在降雨和洪水发生、发展及消退的演进过程中，按预报信息种类和精度分阶段、分层次地判断洪水量级，并及时作出合理调度决策，既利用了不同预报信息，又考虑了各自的误差风险率，具有可操作性强、洪水资源利用率高的特点，可用于汛期全过程实时调度，运用于隔河岩水库，每年平均增加发电量3900万kW·h。

The results show that the simulated track of Bilis has about 39% and 16% improvement averaged during the 72 h forecasts after the assimilation of dropsonde and QuikSCAT data, respectively. The simulation of radar reflectivity is also improved. Similarly, the simulated track of Kaemi is improved by 26% and 21% by assimilating dropsonde and QuikSCAT data, respectively. However, the data assimilation appears to have no improvement in terms of radar reflectivity simulation for the Kaemi case.

结果显示，碧利斯台风在加入投落送资料与QuikSCAT资料后，对模拟6至72小时的平均路径误差除分别有52 km及16 km的改进外，对雷达回波强度之模拟也有所改善，而凯米台风在加入上述两种资料后，对模拟路径误差之整体改进则分别达到71 km及42 km；6月中旬梅雨锋面个案同化该两种资料后之雷达回波模拟强度也有所改善，而与观测较为接近。

I am accused of being overreligious," she said in her quiet, frank manner,"but that does not prevent me thinking the children very cruel who obstinately commit such suicide.""

客人们在卡罗利娜·埃凯家里，举止就文雅一些，因为卡罗利娜的母亲治家很严厉。

Designed by French fashion house Herm è s, this elegant uniform was manufactured in our home, Hong Kong, and was the first without a hat.

由著名品牌 Herm è s 设计，这件高贵的制服是香港本土制造，是我们第一套不配帽子的制服。