第四度空间

A simpler scheme of interference canceler is proposed based on beam space analyzing. It is shown by the numerical results that such scheme can overcome the shortcoming of smart antennas. The time to demodulate desired user is reduced. It also reduce the complexity to realize such an AA/IC system with hardware. In the chapter 5, a multi-beam antenna system with three and six fixed beams are analyzed.

第四章综合考虑了智能天线的空间滤波和级联干扰删除器的作用，提出利用智能天线的空间滤波特性进一步简化干扰删除器的设计方案，数值分析结果表明该方案不但可以克服天线空间滤波的不足，同时缩短了用户信息解调的时间，降低了硬件实现的复杂度。

Statistical characteristics include Tectonic Density, Degree of Central Symmetry, Skewness Index, Degree of Tectonic Optimal Direction, Power Spectrum Density, Cubic Entropy and so on. The former four indexes are implemented in this paper; Structural characteristics show the characteristics of spatial distribution of geological bodies. In chapter four, a quantitative method for describing geological structure by using the structure "tree" is studied and implemented, including its formalized definition and the measurement of the similarity of different "trees".

统计特征有构造密度、中心对称度、失真指数、优益度、密度功率谱、方位熵等等，本文实现了前四个参数值的提取；结构特征是反映地质体空间分布的结构特点，第四章研究和实现了用"树结构"描述地质结构的定量方法，包括结构的形式化描述和结构的相似性度量。

In Chapter 4, a set of distributed graphics algorithms (including fractal image creation, Delaunay triangulation of scalled points, ray tracing and volume rendering) are presented.

在第四章介绍用DGPSE设计的一组分布式图形算法（包括分形图象，Delaunay三角剖分、光线跟踪和辐射度绘制）和分布式图形库DGPSL，并行算法涉及到对象空间并行/图象空间并行方法。

The basic concept of FOP can be summarized as to further optimize effective prescription according to the standard of curative effects and with the aid of modern science and technology and theories of traditional Chinese medicine.

其基本内涵可概括为：以确有疗效的中药复方为研究对象，以现代科学技术和传统中医药理论为技术支持，以该复方所治病证的药效响应为评价标准，以优化重组疗效更优的新复方为研究目的。

Ever since our world has been a world, native forests have been indiscriminately exploited by man.

自从我们的世界一直是世界原生森林被任意剥削人。