分布式数据库

In this mechanism,the system detection is triggered by correlative events,the information of node states is collected timely and distributedly,and the system reconfiguration is executed automatically and parallelly at each node by the way of regeneration and transfer of data.

为了设计高可用的分布式并行数据库系统，计算机工作者除了从系统结构去探索外，更注重系统内部机制的研究与实现，系统重构就是内部机制实现的关键技术之一。

Limited by traditional database technology, the spatial data and attribute data were stored dividually. With the transfermation of GIS application to the Distributed Management System, concurrency control, data sharing and network communication become the new problems.

受以往数据库的限制，空间数据和属性数据是分开存储的，随着GIS应用向分布式管理系统领域的转移，在数据共享、网络通信、并发控制等方面出现了许多难以解决的问题。

In order to meet the needs of combining the total database system and the future development of system. The system should have the abilities of extensibility, maintainability and good transplantability. Using the model based on distributed multilayer structure can solve the problem above efficiently.

同时，为了满足与工程总数据库系统的衔接及系统将来发展的需要，工程勘测管理信息系统应当具有可扩充的能力和可维护的能力，以及应当具有很好的可移植性，而采用分布式多层结构模型正好可以有效地解决上述问题。

During the development, the structure and function of the system are consummates by the build of system model, function model and data model.

开发过程中，采用了分布式动态数据库技术和自顶向下，逐步求精的结构化设计方法。

NET Remoting technologies is put forward. Secondly, this paper enunciates the requirements of the oil warehouse, describes in detail the whole process from analysis to design and gives the database structure of the oil warehouse MIS.

NET Reomting集成分布式应用开发过程；接着阐述了油库信息管理需求，并对油库信息管理系统从需求分析到实现的过程进行了详细的描述，给出了油库信息管理系统的数据库结构。

Techniques such as different level knowledge representation methods,multiple inference engines,interrupt inference process,global-blackboard-based distributed problem solving,knowledge-based modeling and data excerpting,and deductive database ma- nagement method,are used in DECISION-E.

在DECISIGN-E 中还采用了下面的一些特殊技术：不同层次的知识表达方法，多推理机，推理中断处理，基于全局黑板的分布式问题求解，基于知识的建模及数据抽象，演绎数据库管理方法。

At the same time, chaotic pseudo-random sequences generator based on nonlinear dynamic filter security model are constructed to select the frequency hopping points for NDFT, improving the overall system security. 3、Aiming at replay attack of networks in the remote speaker recognition systems and distributed databases speaker recognition systems, a time-stamp watermarking method is brought, which quantizes magnitude coefficients of NDFT. The time-stamp watermarking is embedded into the user's voice sample/voice characteristic information to resist on the replay attack.

同时该类算法采用以非线性动力学滤波器为基础的伪随机序列发生器构造跳频序列来选择频率变换点集合，有效提高了系统的安全性。3、针对远程说话人识别系统以及数据库分布式说话人识别系统存在易受网络重放攻击的缺陷，本文给出一种基于非均匀傅立叶变换的&时间戳&水印量化算法，通过把时间戳水印嵌入待识别用户的语音样本/语音特征信息中，可以有效解决此类缺陷。

It implements Web crawling through distributed technology, and builds index database through accidence analyzing Chinese characters separating unuseful words deleting etyma extracting index words selecting and lexicon. The level system uses new model of Web accessing and level computation to build Web level system so that the requirement for computer resources is greatly reduced.

该搜索引擎使用分布式技术实现网页获取模块；通过词法分析、中文分词、无用词汇删除、词干提取、索引词条选择和词典等技术建立索引数据库；该搜索引擎的级别系统使用了新的网络访问模型和级别计算模型，大大降低了搜索引擎对于计算机资源的要求。

Knowledge base, model base, arithmetic base and inference engine for explosion disaster prevention and emergency succour are built. Design and development idea for decision support system based on object-oriented idea are offered. Design of structure and main function modules of DSS for disaster prevention are given. Distributing DSS for disaster prevention and simulation of disaster in chemical process is realized by system integration of diagnosis module for accident mode, neural network module, disaster simulation and evaluation module, knowledge base and its management system、database and its management system, module base and its management system, support environment for software system, network and hardware.

提出了基于面向对象思想的决策支持系统设计与开发思路与策略，给出了防灾决策支持系统的结构设计以及数据库及管理系统、模型库及管理系统、知识库及推理机等主要功能模块的设计方法，并对事故模式诊断模块、神经网络模型、灾害模拟与评价模块、灾害救援预案模块、决策支持四库系统，以及软件系统支撑环境、通讯网络与硬件等进行了系统集成，实现了两层结构的分布式化工过程爆炸灾害模拟与评价及防灾决策支持系统软件系统。

Knowledge base, model base, arithmetic base and inference engine for explosion disaster prevention and emergency succour are built. Design and development idea for decision support system based on object-oriented idea are offered. Design of structure and main function modules of DSS for disaster prevention are given. Distributing DSS for disaster prevention and simulation of disaster in chemical process is realized by system integration of diagnosis module for accident mode, neural network module, disastersimulation and evaluation module, knowledge base and its management system、database and its management system, module base and its management system, support environment for software system, network and hardware.

提出了基于面向对象思想的决策支持系统设计与开发思路与策略，给出了防灾决策支持系统的结构设计以及数据库及管理系统、模型库及管理系统、知识库及推理机等主要功能模块的设计方法，并对事故模式诊断模块、神经网络模型、灾害模拟与评价模块、灾害救援预案模块、决策支持四库系统，以及软件系统支撑环境、通讯网络与硬件等进行了系统集成，实现了两层结构的分布式化工过程爆炸灾害模拟与评价及防灾决策支持系统软件系统。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。