数据冗余度

由于具有节点能量有限、网络规模大、数据冗余度高、运行环境恶劣等特点，无线传感器网络数据链路层的设计不同于传统的无线宽带络和adhoc网，需要重新设计路由协议。

As with specialty of limited node energy , massive network , high data redundancy , bad conditions and so on , the DLL ( data link layer ) of WSNs , which is different from conventional wireless broadband and Ad Hoc networks , needs to redesign routing protocols .

最后，本文采用OPNET进行协议仿真，仿真实验表明，改进协议明显减少了数据冗余度，降低了数据冲突率，端到端延时也明显缩短。

At last , the paper will simulate the performance of the proposed protocols with OPNET . The results show that the proposed protocols obviously reduce the data redundancy , the rate of data collision and the delay of end to end .

分析和实验均表明，本文的分发方案可以用更少的数据冗余度确保数据的目标可用性。（3）基于误判和漏判抵消的节点永久离开判别器PROTECTOR。

Experiments and analyses show that the new strategy guarantees the desired availability by using much less redundancy . ( 3 ) PROTECTOR , a permanent departure detector based on the balance of false positive and false negative .

数据库的物理结构设计严格遵守数据库关系模式范式要求，尽量降低数据冗余度。

The physical structure of the database is designed strictly to comply with the paradigm requirements and to minimize data redundancy .

该方法简单、实用，大大降低了整个网络内的数据冗余度，节省了大量的存储资源和网络带宽。

This method is simple , practical , and the redundant degree of data in the network could be decreased to a great extent . Samely , it could save storage resources and bandwidth occupation of the network .

本文开发的对象&关系型的仿真数据库系统具有数据冗余度小、易于维护和扩充的特点，可以方便地集成各种类型的面向对象仿真应用程序，为它们提供一个统一的数据库支持。

The object-relational simulation database system we develop has the features of little redundancy and easy to be maintained and extended . On the base of simulation database we can conveniently integrate diverse object-oriented simulation applications and provide a uniform database sustentation for them .

该方法应用线性预测原理减少数据的冗余度并应用Huffman编码以实现最佳平均码长。

This approach uses prediction to reduce the redundancy and classical Huffman coding to reduce the average code length .

这三种可靠性机制的共同特点是要增加数据的冗余度，这使得WSN增加了不同程度的传输能耗开销。

These three mechanisms all improve the reliability of WSN by increasing data redundancy , which makes them brought different rate of transmission energy consumption cost .

为了降低GPS观测数据的冗余度，减轻后续数据处理的压力。根据GPS信号的特点以及小波变换具有的良好局部化分析特性和多分辨率分析特性，提出了基于小波变换的GPS观测数据的压缩方法。

According to characteristic of GPS signal and advantages of local analysis and multiresolution analysis of wavelet transform , the method of GPS measurement data compression based on wavelet transform is proposed to reducing redundancy of GPS measurement data and lightening pressure of offspring data processing .

视频信息在多媒体信息中占据着重要的地位，但视频数据的冗余度大。

Video information in multimedia field occupies an important position , but the video data redundancy is usually very large .

它是去除视频数据中时间冗余度的有效方法，它的性能好坏直接影响编码的效率和图像的质量。

It is an effective method to remove the video data time redundancy , which directly affects the performance of coding efficiency and image quality .

合理的时态模型能够简化应用系统的设计，降低数据存储的冗余度，提高程序的执行效率和系统的稳定性。

A reasonable tense model can simplify the application system design and reduce data storage redundancy , improve program execution efficiency and stability of the system .

数字图像是一类具有广泛代表性的多媒体信息，它具有数据量大、冗余度高、格式繁多等特点。

Digital image is a representative multimedia with huge data , high redundancy and various formats .

为了充分地利用这一属性来消除地形数据之间的信息冗余度，本文提出了一种自适应分块的编码方法。

This paper proposes an adaptive block coding method for terrain data compression in order to take its advantages .

与此同时，由于图像数据量大、冗余度高，图像加密的实时性也尤为重要。

At the same time , due to huge amount and high redundancy , real-time image encryption is very important .

为此，许多分布式应用采用了冗余服务技术：一方面，通过增加数据和计算的冗余度，提高了系统的可用性；

So , more and more distributed applications adopt redundant servers : on one hand , the system availability could be improved through adding the redundancy of data and computation ;

图像的加密与文本的加密有很大不同，由于图像的一些本质特征，如多数据容量和高冗余度这些特点使得图像加密处理的方式与普通文本不同。

Encryption of images is different from that of texts due to some intrinsic features of images such as bulk data capacity and high redundancy , which are generally difficult to handle by traditional methods .

由于越来越广泛使用的图像、多媒体信息，因其数据量大、冗余度高，已给传统密码提出了挑战，然而混沌密码在多媒体信息的加密上体现了强大的优势。

Challenges have been set with traditional cryptography because of the bulk data capacity and high redundancy of widely-used patterns and multi-media information , while chaotic cipher has great superiority over the encryption of multi-media information .

与文本信息不同，数字图像具有数据量大、冗余度高的特点，这使得应用传统密码学加密方法有很大的局限性。

Digital image has many characteristics , such as large data , high redundancy and so on , which are different form text information . These characteristics make traditional encryption methods are not suitable to image information .

很多专用的图像加密方案为解决图像数据量大、冗余度高、像素间相关性强等技术特点而被提出，与此同时也出现了很多用来评价图像加密算法的性能参数。

Many dedicated image data encryption scheme to solve the large amount of data redundancy and high correlation between pixel intensity and other technical characteristics have been proposed , at the same time there have been many image encryption algorithm used to evaluate the performance parameters .

该模型用方案树与邻接表描述动态路网的拓扑结构，用数据库存储路网数据，达到了尽可能减少数据冗余度并有效揭示动态性的目的。

The topology was represented with scheme-tree and adjacency list in the new model with dada saved in the database , so that data redundancy had greatly reduced and evolution was depict distinctly .

而且图像信息与文本数据不同，具有数据量大、冗余度高、像素间相关性强等特点，对其加密会消耗大量的计算资源和时间。

In comparison to the text , the image is characteristic of a huge amount of data , high redundancy and high relationship among pixels . It is both resource and time consuming for image encryption using traditional text encryption algorithms .

然后设计了程序流程、模块功能、数据结构，特别提出了一种数据冗余度小、动态调整方便的路网数据结构。

Consequently , program flows , module functions and data structures are designed , and particularly an original data structure of road network is presented , which has smaller data redundancy and makes dynamic modification easy .

这样，既符合自身业务发展的需求，又能够优化管理流程，实现数据信息的共享，控制好数据的冗余度，提高企业的工作效率、降低成本。

This not only in line with need of their business development , but also to optimize management processes , information sharing data , control data redundancy , and improving the work efficiency , reduce costs .

各模块之间相对独立，数据共享，提高系统执行效率，降低数据冗余度。

Between each module is relatively independent , data sharing , improve the efficiency of system execution , reduce data redundancy .

该方式直接维护各电力系统实体对象，可更好地与电力系统实体的层次型结构相匹配，数据结构的意义明确，降低了维护复杂性和数据冗余度。

This new mode maintains the entity objects in the power system directly , which helps it to match the hiberarchy of the power system . It makes the data structure clear , and reduces the complexity of maintenance and the redundancy of data .

在数据分发过程中需要根据局部区域节点密度动态调整数据包冗余度，避免数据分发性能降低或者网络资源浪费。

Therefore the redundancy of data dissemination should be adjusted dynamically according to the current density of nodes to avoid the degradation of performance or waste of network resource .

本系统采用ADO管理数据库数据，采用Access数据文件存储方式，提高了数据可操作性，降低了数据冗余度。

It enhances the maneuverability and reduces the redundancy of data that it uses ADO to manage the database and Access file to keep data .