基于计算机的

Lastly, we study a model of the heat flow cryptosystem base on a linear pseudoparabolic equation. The C-N difference scheme arithmetic of the encryption and decryption problems is designed. Then the numerical simulation is done through computer programming. So by analysing the simulation data we deduce many regularly conclusions on the influence of the key functions to the encryption and decryption operations, which establish the theoretical base for the application of this cryptosystem.

最后，文章研究了一类基于线性伪抛物型方程的热流密码体制模型，设计了加、解密问题的C—N差分算法并通过计算机编程进行了数值模拟，得出了一些不同密钥函数对加、解密作业影响的规律性结论，为该密码体制的现实应用奠定了理论基础。

This paper presents a fast algorithm based on the measured equation of invariance.Conformal meshes are made along the surface of two-dimensional scatterer.Renumbering of nodes changed the original sparse matrix into band one,and the consumption of computer memory and CPU time decrease from O(N2) to O.Via this new algorithm,electrically large problem can now be rapidly solved.

提要 本文基于不变性测试方程法提出一种快速算法，在二维散射体表面建立共形差分网格后，通过对节点的重新排序，将原问题中的稀疏矩阵变换为带状稀疏阵，从而使占用的计算机内存和计算时间均由O(N2)下降为O，可以解决原来无法计算的问题。

At present, basing on network and computer applications, more and more enterprises realize digital product development.

目前，尽管越来越多的企业实现了企业内部基于网络和计算机应用系统的数字化产品开发，但低水平的产品开发过程管理以及低效率的企业间产品数据交换。。。

Virtual reality is an immersed interactive environment based on the calculable information.

中文摘要：虚拟现实(Virtual Reality，简称VR)是一种基于可计算信息的沉浸式交互环境，最大特点就是参与者能用人类自然的技能与感知能力与计算机生成的虚拟环境进行自然的交互，因此，要求系统能实时地对各种输入做出反应。

A PID control method based on BP neural network was proposed,concerning the multi-layered temperature control of calenderer rollers and the limitations of the conventional PID control which resulted from the control of the nonlinear and time-varying system.The system design and software development were also presented.

针对压延机辊筒多段温度控制以及常规PID控制在非线性的、时变系统中控制效果的局限性，提出了一种基于BP神经网络整定的PID控制方法，给出了计算机控制系统设计，建立了比例、积分和微分三种参数自学习的PID控制器。

On the other hand, as Pecorra and Carrol demonstrated in 1990 that is able to synchronize chaotic systems, many chaos synchronization schemes have been proposed in the literatures.

本论文中基于一个简单的分段线性映射设计了混沌跳频码，计算机仿真表明它具有好的平衡特性、汉明相关特性和大的跳频间隔，用于混沌通信系统中是一个好的混沌跳频码。

Having introduced a set of dimensionless parameters, the spatial distributive function of the magnetic field and the induced electric field is made dimensionless and is applied to the computation and computer simulation of spatial distribution of the magnetic field and the electric field induced by a circular coil and a 8-shaped coil based on MATLAB.

在确定了一些无量纲参数后，对磁场及感应电场的分布函数进行无量纲化，并用于基于MATLAB环境下圆形、8字形线圈磁场及产生的感应电场的计算及其分布的计算机仿真。

By analytic geometry method and solving quadratic equation,a computer simulation algorithm of digital projection under arbitrary scanning locus was proposed.The algorithm is based on the rules of attenuation of monochromatic X-rays.Through mathematical modeling and computer simulation,digital projections of ellipsoid and cylinder in circular and helix scanning modes are exemplified respectively,which are proved to be correct by FDK and PI-line reconstruction algorithms.

介绍了一种利用解析几何和求解二次方程仿真任意扫描轨迹下的锥束射线投影数据算法，该方法基于单色射线贯穿物体的衰减理论，通过数学建模与计算机仿真，给出了椭球、圆柱两种典型模型分别在单圆、螺旋线扫描轨迹下的投影数据仿真结果，并利用FDK和PI线重建算法进行验证，证明了该种数值仿真方法的正确性。

Combined with modern digital image processing technology, image matching and composite method of a group of images is discussed based upon which a computer aided composite method of the lenticular screen covering color stereo image is developed.

对基于柱透镜光栅的立体照片的制作原理进行了理论分析，推导了立体成像的光学原理，结合现代数字图像处理技术，对多幅图像的匹配及合成方法进行了分析，提出和实现了一种计算机辅助彩色立体图片合成方法。

The subject of entry chiefly studies the temperature and humidity control of air-conditioning system based on the new air automation system of the optical institute of the astronavigation science and technology committee, and it also designs the computer supervision system on the base of RS-485 bus platform.

本项目是在航天科工集团某研究所光学加工楼新风自动控制系统的基础上，研究中央空调系统的温湿度控制，并设计出了以RS-485通讯总线为平台，基于PC机的计算机监控系统。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了