文件操作

• The importance of network security is introduced . by analysing traditional measurements taken on network security , we find out that the last network security gate should be established on operating system level . a mac mechanism on socket layer is implemented in the paper
  3 ) 、研究了传统的文件保护措施,结合嵌入式文件系统的特点,提出了一种基于文件描述符的文件安全机制,从文件操作api级实现了对文件的保护。
• The technology of activex , database and network that used in the development of the platform are discussed in the thesis in order . the modules of database operation used in visual lisp , binary files operation and network information browser are developed
  文章依次对平台开发中所涉及到的activex技术、网络数据库技术和网络技术进行了讨论，并开发出用于visuallisp中的数据库操作模块，二进制文件操作模块和网络信息浏览模块。
• The former is a new application - layer protocol - dicom upper layer based on tcp / ip , including format of transformed information ， message state transfer , negotiation of association . the latter is storage service class including method of file operation , file format and media specification
  前者定义了在tcp / ip之上的dicomul应用层协议，规范了信息格式，状态转换，连接协商等内容，后者规范了图像的存储服务类，包括文件操作方式，格式以及媒质规格等内容。
• The former is a new application - layer protocol - dicom upper layer based on tcp / dp , including format of transformed information , message state transfer , negotiation of association . the latter is storage service class including method of file operation , file format and media specification
  前者定义了在tcp ip之上的dicomul应用层协议，规范了信息格式，状态转换，连接协商等内容，后者规范了图像的存储服务类，包括文件操作方式，格式以及媒质规格等内容。
• Using api function of win32 system , usb application program of the communication model only need a few simple functions to connect the equipments of the drivers . based on microsoft access , data system adopts odbc to manage the hospital data . using sharing memory technology , designed real data system
  通讯模块的usb应用程序利用win32系统中api函数，只需通过几个简单的文件操作函数就可以实现与驱动程序的某个设备通信；数据库系统以microsoftaccess为历史数据库平台，采用了开放的数据库连接标准odbc管理历史数据，同时采用了共享内存技术，自行设计开发了实时数据库部分。
• This system adopts and implements the thread pool driven mechanism , each operation as a task is delivered to a task queue and is executed by a special work thread . to communicate between hosts in the system , this system designs and implements a network protocol . this system adopts and implements a erasure code , with which files can be distributed and restored correctly
  本服务器采用并实现了线程池驱动机制，所有操作作为一个任务放到任务队列中由对应的任务处理线程进行处理；设计并实现了一套底层网络协议用于系统中各主机间的交互；利用本地信息保存全局信息查询机制完成了系统间文件信息的同步；采用了一个erasurecode使文件能够有效的分片和恢复；最后采用一种锁机制保证了网络文件操作的同步。
• Before resuming mirroring is possible , the database owner must fix the problem by backing up the log containing the add - file operation on the principal server and manually restoring the log backup on the mirror database using the with move option or the file path is created on the mirror
  在可以恢复镜像之前，数据库所有者必须通过在主体服务器中备份包含添加文件操作的日志并使用with move选项或镜像数据库上创建的文件路径在镜像数据库上手动还原日志备份来解决该问题。
• It provides a group of apis which can be called by application programs for accessing files and commands for users to operate on files . the fsmiddleware has many outstanding characteristics : record file share / exclusion control , huge storage capacity , high - speed data access , high availability , high reliability and high flexibility , etc
  Fsmiddleware实现了大型机与开放系统( windows和unix )之间跨平台的文件共享，提供一组文件访问api供上层应用程序调用以及一组文件操作命令供用户使用。 fsmiddleware具有以记录型文件为单位的共享独占访问控制、海量存储、高速数据存取、高柔性以及高可用性、高可靠性等突出特性。
• Ftam supports file operation from different systems , that means ftam has nothing to do with the system on file transfer and file treatment . second : disk array is introduced to tfft . the scsi interface is modified to satisfy the requirement of ewsd
  Ftam信息模式是基于虚文件和虚文件存储器的概念，支持不同系统之间的文件操作，即ftam在文件的传送和处理方面有着与系统无关的特性；引进磁盘阵列技术，修改scsi接口，以适应ewsd交换机的要求；参照q3接口协议编写出上层的网络管理软件系统，实现tmn定义的文件传送方面的功能。