The idea behind it is to approximate the object with a simpler bounding volume that is a little bigger than the object . in building hierarchies on object , one can obtain increasingly more accurate approximations of the objects . so during traversing bounding volume hierarchy , it speeds up collision detection by prune away primitive pairs , which will not intersect clearly though rapid intersection test between bounding volumes and just deal with those whose bounding volume is intersected 层次包围盒方法是解决碰撞检测问题固有时间复杂性的一种有效的方法，它是用体积略大而几何特性简单的包围盒来近似地描述复杂的几何对象，并通过构造树状层次结构来逼近对象的几何模型，从而在对包围盒树进行遍历的过程中，通过包围盒间的快速相交测试来及早地排除明显不可能相交的基本几何元素对，而只对包围盒重叠的部分元素进行进一步的相交测试，以提高碰撞检测的速度。
Our results show that the rate of correlation among the random variables of those output sequences are low although they are not independent ; in addition , the output sequences of those combined generators are homogeneous markov chains which are strictly stationary processes with ergodicity ; the output sequences of those combined generators are also proved to summit to the strong law of large numbers and the central limit theorem ; finally the computation formula of the rate of the accordance between the output sequences and input sequences of those combined generators is given 我们的研究结论表明：虽然这些序列中随机变量之间不具有相互独立性，但它们的相关程度却比较低；证明了“停走”生成器， km _ 1m _ 2型组合生成器和加法型组合生成器的概率模型输出序列都是强平稳的和遍历的齐次马氏链；讨论了这些序列的概率极限性质，证明了它们均服从强大数定律和中心极限定理；还分别给出了各类生成器的输出序列与输入序列之间的符合率的计算公式。
After knowing fully the present situation of business operation of the golden cereal company and development characteristics in logistic - system field , the mathematics model of logistics system has been established in the article with the application of linear program method in operational research , as well as the strategy of minimum route in graph theory and the thought of transiting all over ; meanwhile , on the foundation of internet network technology and structure of b / s , the online optimization design and production of web page have been carried out for the logistic - system of the golden grain farming capital company with adoption of jsp ( java server page ) technology and sql server database technology 本文在充分了解金色谷农资公司的业务运行现状和物流配送行业发展特点的基础上，应用运筹学的线形规划方法，以及图论中最短路径的策略和图的遍历的思想，建立了配送系统数学模型；并基于internet网络技术b s结构基础上，采用jsp ( javaserverpage )技术和sqlserver数据库技术，对金色谷农资公司物流配送系统进行了网上优化设计及网页制作，研制开发了金色谷农资智能配送网。
Chapter 5 is contributed to studying convergence rate of standard transition function and relation of all kinds of convergence rates . by revealing the close link among strong ergodicity , stochastically monotone , and the feller transition functions we are able to prove that a monotone ergodic transition function is strongly ergodic if and only if it is not a feller transition function 第五章讨论标准转移函数的收敛速度以及各种收敛速度之间的关系，通过找出强遍历、随机单调性和feller转移函数之间的紧密关系，我们证明了随机单调标准转移函数是强遍历的充要条件是它不是feller转移函数。
The other is schema path look - up hash table index . it is used to evaluate absolute paths for general regular path expressions , such as relative path expressions , so as to relieve the workload of large scale of navigation and speed up queries 此外，为了解决主索引对于相对路径查询需要大规模遍历的问题，我们设计了模式路径哈希表作为辅助索引，用于在主索引执行相对路径查找之前计算相对路径查询的绝对路径，使主索引的遍历负荷大大减轻，从而使相对查询的效率提高。
