系统文件

First, the definition, significance, research emphases and status of NC machining verification technology are introduced in this paper. Then the platform—ACIS for the development of verification system, including its development interface, data structure, main functions, features and the application in the system is introduced. And, we indicate in brief the correlative knowledge of NC machining and then discuss the definition of the machining environment of NC machining verification system as well as the way that the module has been developed. Finally, we describe how to make Help Files and the structure of the Help Files in the system.

本文首先对数控加工动态仿真技术的定义、意义、研究重点、研究状况进行了介绍；并介绍了可用于开发数控仿真系统的实体造型平台—— ACIS ，包括 ACIS 的开发接口、数据结构、主要功能与特色以及在数控仿真系统开发中的应用；然后通过简要介绍数控加工的一些相关知识，引出了数控仿真系统加工环境的定义与该模块的实现方法；最后讲述了帮助文件的制作以及该系统帮助文件的结构。

First, the definition, significance, research emphases and status of NC machining verification technology are introduced in this paper. Then the platform―ACIS for the development of verification system, including its development interface, data structure, main functions, features and the application in the system is introduced. And, we indicate in brief the correlative knowledge of NC machining and then discuss the definition of the machining environment of NC machining verification system as well as the way that the module has been developed. Finally, we describe how to make Help Files and the structure of the Help Files in the system.

摘要本文首先对数控加工动态仿真技术的定义、意义、研究重点、研究状况进行了介绍；并介绍了可用于开发数控仿真系统的实体造型平台――ACIS，包括ACIS的开发接口、数据结构、主要功能与特色以及在数控仿真系统开发中的应用；然后通过简要介绍数控加工的一些相关知识，引出了数控仿真系统加工环境的定义与该模块的实现方法；最后讲述了帮助文件的制作以及该系统帮助文件的结构。

Different from all other current file encryption systems which are also based on DES, our Enhanced File Encryption System is following X9.17 key generation standard to ensure the strength of the primary key, utilizing Cipher Block Chaining mechanism to hold the text structure, and introducing cache technique and Bit / Byte mapping algorithm to enhance the efficiency while reducing the complexity of the system.

与当前许多基于 DES 的文件加密系统不同，我们的增强型文件加密系统采用 X9.17密钥生成规范确保用户主密钥的强度，采用密文分组链接方式保护密文的结构信息，并且通过缓存技术和位/字节映射算法提高系统的执行效率、降低系统的复杂度。

According to introducing, the meeting after these baleful trojan programs affect tube-shaped part of computer science department undertakes to the system of a lot of destroy, be like: Without the license of computer user bowdlerism or it is file of the mass data in replacing interconnected system of computer science department, cause the important data in maintaining existence system to the file is lost or be distorted.

据介绍，这些恶意木马程序感染计算机系统后会对系统进行很多的破坏，如：未经计算机用户的许可而任意删除或是替换计算机系统中大量数据文件，造成保存在系统中重要的数据文件丢失或被篡改。

For example, when visiting a file, the FAT file system as a result of the file allocation table lists only the name of each file and the initial cluster, and did not say whether the document exists, and through their records in the folder to determine, and import folder and file allocation table is included in the index.

例如当访问一个文件时，由于FAT文件系统的文件分配表只列出了每个文件的名称及起始簇，并没有说明这个文件是否存在，而需要通过其所在文件夹的记录来判断，而文件夹的入口又包含在文件分配表的索引中。

Based on analysing the design methods of software,data file format and processing data record,the constructure of simulation system data files was set up. And some problems in data processing were studied,all of these made a speed and precise precalculation of the simulation system. The simulation dynamics parameters precalculated are same as the real system.

在分析现场系统对数据缓冲区、数据文件、过程数据表的设计方法的基础上，设计和建立了仿真系统的各种数据缓冲区、数据文件格式，并应用于仿真系统，完成了力度参数的计算仿真，对仿真系统的计算准确性和计算速度等起到了重要作用，仿真计算结果与现场系统计算结果一致。

The main features of this paper is: nothing to do with the platform, this system can be compatible with the majority of software and hardware used by the platform, as well as various database platform, shielding the differences of hardware and software platform such as network, operating systems, databases, application systems and so on, so that enterprises and institutions could achieve seamless, transparent data exchange through data exchange system; Java technology used to develop the system transplantability; using data exchange center to achieve centralized data processing, different data format conversion, increased system scalability; from data transmission, authentication, access control, encryption and more news content log-class areas enhanced data exchange system security; using DES and RSA algorithm , increased the confidentiality of data transmission; create WrapperTimer category achieved data transmission timing implementation and reduce the dependence on artificial.

设计的系统与平台无关，能兼容企业所用的大多数软硬件平台，以及各种数据库平台，屏蔽网络、操作系统、数据库、应用系统等软硬平台的差异，使企事业单位通过数据交换系统实现无缝的、透明的交换数据；采用数据交换中心来实现数据的集中处理、不同数据格式的转换，增加了系统的可扩展性；从数据传输、身份认证、权限控制、消息内容加密和多级日志等多方面增强数据交换系统的安全性；用DES和RSA算法对XML文件或XML文件中的元素进行加密，增加传输数据的保密性；创建WrapperTimer类实现了数据传输的定时执行，降低了对人工的依赖性。

Mastercam9.0 numerical control system first makes the NCI files according to graph and processing information. But NCI files can not transmit directly to numerical control machine tool, it cant control numerical control machine tool normally by special post processing programme of all kinds of numerical control system until it transforms NCI files to NC files received and identified by numerical control system.

采用MasterCAM9.0进行数控加工时，首先根据图形信息和加工信息生成NCI文件，但NCI文件不能直接传送给数控机床，还必须通过各数控系统专用的后置处理程序，将NCI文件转换成数控系统可以接受和识别的NC文件，才能控制数控机床正常工作。

Technically, open gives direct access to the stdio filesystem calls in the system's C libraryit returns a new file object that is connected to the external file and has methods that map more or less directly to file calls on your machine.

技术实现上， open 通过调用系统C库直接访问stdio文件系统，它将返回一个连接到外部文件的新的文件对象。这个对象的很多方法直接或间接地映射到你系统的调用上。

Another journalled filesystem isthe Third Extended filesystem, the successor to the Second Extended filesystem. This has

另一种日志刑的文件系统是Third Extended文件系统，它是Second Extended 文件系统的继承者。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失