查询词典 arithmetic computer

The computer aid animation is a high and new technique; it is the thing that combines the art and the computer graphics together. Accompanying with the high speed devolvement of computer hardware and graphic arithmetic , it synthesize the computer science, art, mathematics, physics with the knowledge of the other and related course, the computer aid animation make abundance sequence virtual real images on the screen.

计算机动画是计算机图形学和艺术相结合的产物，是伴随着计算机硬件和图形算法高速发展起来的一门高新技术，它综合利用了计算机科学、艺术、数学、物理学和其它相关学科的知识，在计算机上生成绚丽多彩的连续的虚拟真实画面。

In this paper, the concept of network security and security structures of OSI and Internet is introduced, and various threats confronting the computer network are also discussed. Several kinds of network information security technologies, including firewall technology, virtual private network, intrusion detection system, data encryption technology, identity authentication and security protocol etc. are also examined. The security of internal network is the biggest problem in the construction of each network. The solution to this problem lies in setting up a firewall. The theory of a firewall and the approach to its actualization is studied. Intrusion detection system, an important part of the computer network security system, has gained extensive attention. IDS monitors the computer and network traffic for intrusion and suspicious activities. It not only detects the intrusion from the extranet hacker, but also the intranet users. The emergence of virtual private network paves the way for realizing secure connection of LAN quickly and at a relatively low cost. The concept, function, key techniques, including the tunnel technology, and the ways to realize VPN are expounded in this paper. Also introduced is the data encrypt network technology, which is called the soul of computer network security, such as digital digest, digital signature, digital certificate, digital encrypt arithmetic and so on. At the same time, the principle and the process of implementing network security by digital certificate and digital signature, the basic principle and characters of security protocols, and finally, three of the security protocols, concerning the security problems in network, IPsec, SLL and SET are analyzed in detail Computer network system should be a system of dynamic defence, both dynamic and static, passive as well as active, and even offensive, combined with management and technology.

本文系统地介绍了网络安全的概念、OSI及Internet的安全体系结构，并讨论了计算机网络面临的各种安全威胁；内部网络的安全问题是每个建网单位面临的最大问题，可以认为防火墙技术是解决网络安全的一个主要手段，本文研究了防火墙的原理及其实现手段；作为一种主动的防御措施，入侵检测系统作为网络系统安全的重要组成部分，得到了广泛的重视，TDS对计算机和网络资源上的恶意使用行为进行识别和响应，不仅检测来自外部的入侵行为，也监督内部用户的未授权活动；虚拟专用网技术的出现，为实现网络间的连接提供了快速安全但又相对便宜的手段，本文较深入的探讨了实现VPN的隧道技术，并对VPN的概念、功能、实现途径、基本构成、关键技术及发展前景等问题进行了全面论述；数据加密技术是网络安全核心技术之一，本文从数据加密算法、数字摘要、数字签名及数字证书等几方面简要介绍了数据加密技术，并分析用数字证书和数字签名实现网络安全的原理和过程；对安全协议的基本原理、主要特点进行了较为深入的研究，并就网络的安全性问题剖析了三种安全协议：IPsec协议、SLL协议和SET协议。

In this thesis, the basic arithmetic of PIV software - cross-correlation arithmetic is introduced in detail, During the data process, through processing the two sequential images by the cross-correlation arithmetic, the vector charts of particles velocity can be obtained, so is the chart of absolute velocity, with velocity decomposed into the radial velocity and axial velocity.

本文对试验所获得的连续图像通过互相关算法，获得颗粒速度矢量图，并将速度分解为径向速度和轴向速度，对每一小区域内的颗粒按速度方向不同进行速度平均，获得颗粒的平均速度分布曲线。

We have accomplished under mentioned arithmetic in the project, which are the wavelet zero tree coding arithmetic based on difference signal and the non compression arithmetic based on the integer wavelet transform of interested area. We have achieved the huge amount of data processing and storing in real time、high speed and multi-channel.

完成了基于差分信号的小波零树编码算法和基于感兴趣区域整数小波变换的无损压缩算法，实现了高速、多通道、在线实时信号的处理存储。

using the c language programming to be in progress when secretly scheming against often may produce problem because of not paying attention to a type change , when using the division arithmetic magic figure especially, change , lead to thereby arithmetic result block of wood rightness or insufficient problems of accuracy often because of not paying attention to the arithmetic data type.

使用c语言编程进行计算的时候常常会因为不注意类型转换产生问题，尤其是在使用除法运算符"/"的时候，经常因为没有注意运算数据类型转换，从而导致运算结果不正确或着说是精度不够的问题。

First the math theory of machining simulation is studied, and the set structure of NC machining simulation system whose components, including time, input, output and so on, are defined. Hereby we set up the hierarchy structure, the logical structure, the static model and the dynamic model of simulation system. The construction method of sweep entity of cutter and rotation parts is researched, and their differential geometry invariants are calculated. NC code is unscrambled, and the recursion division arithmetic of time segment is put forward, which is the driven data of the movement or rotation parts. The CLDATA should be interference-free. To examine if there is interference between cutter flank and the work piece, an arithmetic that discussed the existence of intersecting curve between them is put forward. To examine if there is interference between two turrets, an arithmetic that discussed the existence of intersection set between two polygons is put forward.

首先研究加工过程仿真的数学基础，然后定义数控加工仿真系统的集合结构及时间集、输入集、输出集等概念，建立加工仿真的层次结构和逻辑结构，阐述双刀车削仿真系统的静态模型和动态模型建立方法，分析刀具扫描体和旋转部件扫描体的建立方法及其微分几何性质；研究NC代码解读技术和双刀加工时间段递归子分划技术，为驱动各仿真单元作数据准备；通过讨论后刀面和工件表面交线的存在性判断刀具后刀面与工件间是否干涉，通过求多边形的交集判断刀架与刀架是否干涉。

The disquisition brings forward three principle in combination arithmetic designing and combination arithmetic choice. There is currency, countability and less information redundancy. And the disquisition analyses the relation of them. The three principle is the dominant ideology in combination arithmetic designing.

组合算法的选择与应用组合算法评价依据复杂性选择应用本文提出了在组合算法设计和组合算法选择方面所应当遵循的三个原则，即通用性、可计算性和较少的信息冗余量，并初步分析了它们之间的相互关系。

The arithmetic of incidence matrix is an arithmetic obtained by studying adjacency matrix and the relationship of tree and incidence matrix to get an new arithmetic of finding the maximum matching of tree.

通过邻接矩阵的方法得到一种去边法求树的最大匹配的算法；并通过图与其关联矩阵的关系，寻找到求树的最大匹配的一个新算法，称为关联矩阵法。

The fourth had reading, writing, dictation and elementary arithmetic; the third, reading, grammar, arithmetic and geography; the second, reading and grammar, arithmetic, algebra through simple equations, and geography with map-drawing; and the first finished Loomis' Treatise on Algebra, studied four books of Loomis' Geometry, and parts of Swinton's Universal History and read selections from Addison.

第四班级授以阅读、写作、听写与初级算术，三班授以阅读、语法、算术与地理，二班为阅读、语法、算术、线性代数及绘图地理，一班则为卢米兹代数终论，卢米兹几何四部，史云顿寰宇历史，及阿狄森（Joseph Addison十八世纪英国著名作家）文选。

The arithmetic of the subtraction is based on the serial arithmetic. It can entirely enumerate every pair of subtrahend on a bit, and it also calculates two possible loaning carry values on each bit. So the subtraction can be operated through automatic selection, and complete collateral subtraction and carry operation. The method of single division is same to it. With the stenography of shifengshou we can solve the complex division. We put the formula and the technique into the DNA model to get the result. The methods all make the step decrease and change the conventional arithmetic.

减法的DNA 算法理论主要是来源于串行思路中的算法，它是将每一位上的两个减数对的所有可能进行全列举，同时考虑每一位上的两种借位信息，使得运算进行自动选择，一步即可得到最终结果的算法；除法中一位数除多位数的算法还是从我们平时所进行的串行运算中得到启发而设计的算法；而除法的多位计算思路则来源于史丰收速算法，将算法中的口诀及技巧应用到DNA 链当中，使得传统中的代数运算能够并行的得到最终的结果，这三种算法的设计都使得计算步骤减少，从根本上改变了算法的运算机制。

A backer of an Afghan law that critics say legalizes marital rape has rejected the international outcry as foreign meddling.

饱受批评的一项法律的拥护者说合法化的婚内暴力不会受国际舆论的干涉。

Years ago, a ancient Egyptian fleet went to the Land of punt for seeking a kind of flavor named "myrrh", and aromatic plants which has dense exotic style for the queen Hatshepsut.

3500年前的一个古埃及的舰队到&彭特之地&寻找一种叫没药的香料。