随着3G移动通信技术的发展,无线网络规划及优化变得越来越重要.文章主要介绍了WCDMA无线网络规划及其流程,重点分析了WCDMA网络预规划部分,探讨了系统中容量与覆盖的关系及平衡.

Based on a Color Layout Descriptors proposed in MPEG-7,extraction of Color Layout Descriptors from DC component of 8×8 sub-blocks of Y,Cb,Cr color component images in DCT domain is presented in this paper for fast image indexing and image retrieval in DCT compressed domain such as JPEG images according to spatial distribution of color.

运动检测广泛的应用于机器视觉和基于对象的视频编码以及生物医学的运动功能分析等领域.文章分析了平面封闭边界运动和傅里叶描述系数的变化关系,提出了基于边界傅里叶描述子和Hough变换检测平面封闭边界的运动,并通过计算机仿真证明该方法的可行性.

Point prediction controllers have been designed and their robustness has been analyzed, with the conclusion that any DMC controller is the weighted representation on point prediction controllers and its robustness can be represented approximately by weighing the robustness of point prediction controllers. Furthermore, in order to improve the condition of matrix inverse of DMC and its stability, a penalty factor is applied to Δu(t) of DMC, it is concluded that its robustness is no less than that of the original DMC. Finally, the effect of controller's parameters on system robustness is analyzed and the parameters adjustment method to improve robustness is investigated in this paper. Therefore, some clear directions are given on the application of DMC.

本文提出了基于改进BP算法的对管道内两相流进行电容层析成像的方法.研究了提高收敛速度的途径以及成像的网络模型.并给出了图像仿真结果.结果表明该方法能缩短训练时间.

提出了基于图象分割子集的神经网络对管道内两相流进行电容层析成象的方法.解决了神经网络的输出单元数与重建图象精度之间的矛盾.研究了成象的分割网络模型及其实现步骤.给出了系统误差E和图象仿真结果.结果表明该方法能够更精确和快速地重建出两相流体的断层图象.

本文分析了两相流电容层析技术中目前存在的问题,研究了基于分组BP网络的成像方法,提出了成像的网络模型及其实现步骤.实验结果表明,该方法能够快速和较高精度地重建出两相流体的断层图象.