查询词典 codes

In this paper, we summarize the foundations of Algebraic function fields, algebraic curves over finite fields and algebraic geometry codes, then we focus on the dimensions of codes on the quotient of the hermitian curves, by using the theory of weierstrass semigroup and the idea of Ho...

我们在系统地总结了代数函数域，有限域上的代数曲线和代数几何码的基本知识的基础上，利用Weierstrass子半群理论，使用Homma和Kim的方法，讨论了Hermite曲线商域上码的维数问题，得到的主要结果如下： 1。

The parameters of codes on the curves over finite fields is always the important problem in algebraic geometry codes.

有限域上代数曲线上的码的参数问题一直是代数几何码研究中的重点问题。

It must depend on external database. Without the database, one-dimensional bar codes can not have meanings. Two-dimensional bar codes overcome this weakness, it can encode a large ament of information in a small area, is a full data file.

目前常用的是一维条码，但一维条码最大的弱点就是表征的信息量是有限的，需要依赖外部数据库支持，离开这个数据库条码本身就没有意义了。

The main topics include entropy and mutual information, data compression, noiseless coding, Shannon theorem, noiseless coding, Shannon Theorem, linear codes, cyclic codes.

本课程宗旨是简介基础的资讯理论，主要课程含嫡及相互信息、资料压缩、无杂讯编码及Shannon定理、线性码、循环码等。

Second, to eliminate a special class of cycles in QC-LDPC codes, we considerQC-LDPC codes with circulant permutation matrices as protograph LDPC codes. Andwe reveal the relationship of cycles in a protograph LDPC code and its mother matrix.

其次，为了消除准循环低密度奇偶校验码中一类特殊的环，我们把由循环置换矩阵扩张得到的准循环低密度奇偶校验码看做一类原图低密度奇偶校验码。

A character-codes model based pattern recognition method by using amplitude data of targets frequency response is proposed after the establishment of high frequency response equation of radar targets. The method uses the same unvariant character-codes to express the same target of different angles and uses sequential separating of regions of target's reference variables to obtain multiple coding vectors of all regions for every target. The category and pose of target can be determined after a two-staged classification processing such as coding processing of target range profile data and errors correcting processing of coded data. The two-stage classification results are used to target identification as posterior hypothesis to be tested by sufficient convincing and necessary convincing. The character-codes model based pattern recognition method is also adaptive to variation of target angles and controllable in error probability. Time-consuming and complicated iterative computation is not necessary in the train process of pattern recognition.

首先建立了雷达目标的高频频率响应方程，这种方程将目标多散射中心理论与目标局部谐振理论有机地结合起来；进而提出了目标多频响应结构成像方法，这种方法将瑞利区频率响应或谐振区频率响应曲线的不同部位用各种不同的近似方法去逼近，通过特征谱估计方法将目标的局部频响特征与宽带距离响应特征结合起来；然后提出了一种基于姿态角变化区域的序贯划分与多模匹配的特征编码识别方法，这种方法具有能适应目标姿态角的变化以及能控制识别的差错概率α等优点，在目标识别时只需要目标在少数有限个频率激励下的幅频响应数据。

Great amount of materials about legal history came in sight such as the Codes of the Qin Dynasty excavated in Shuihudi,the Codes of the Han Dynasty in Zhangjiashan,13 Pieces about Observing Laws and Rules etc.in Yinque Mount,the silk book Huang Di Si Jing and Zhou Yi in Mawangdui,and Confucian and Tao literature in Guodian,and other ancient lost books.The reemerging of the codes and literature concerning legal thoughts provides a reliable basis and broad space for rewriting the legal history of China.

出土文献中大量的法律史料，如：睡虎地出土的《秦律》、张家山出土的《汉律》、银雀山出土的《守法守令等十三篇》、马王堆出土的帛书《黄帝四经》与《周易》、郭店出土的儒家与道家文献以及其它古佚书，等等，使久已失传的律典及法律思想方面的文献得以重现，为改写中国法律史提供了可靠的依据和广阔的空间。

The performance of the turbo codes employing 16, 8 or 4 states constituent codes are compared with each other. The effect of a block interleaver or a random interleaver on turbo codes is analyzed, and the concept of"effective length of codewords"is presented.

分析与模拟了由不同状态、不同连接矢量的分量码构成的turbo码的性能，讨论了归零处理turbo码性能的影响，研究了分组交织器与随机交织器的性能差异，提出了&有效码长&的概念； 4。

This module is not only suit for decoding a concatenated code with non RSCs as its constituent codes, but also it can provide soft information output of both codeword and information bits, so it can be applied to decoding a Turbo code and joint detection and decoding. Taking into consideration serial and parallel concatenated Turbo code, the author proposes a combined code, with 2 outer codes and 2 inner cods as its constituent codes, i.e., 2×2 Woven code.

本文的第三章研究编码技术，在前人研究成果的基础上，为了模块化地对此级联码进行迭代译码，提出了一种模块化的软输入软输出四端口处理模块，此模块可用来处理非RSC卷积码为子码的级联码，并且可以提供码字和信息比特的软信息输出，是一种模块化很强的处理模块，可用于传统的Turbo码的迭代译码，尤其在迭代均衡和迭代检测的系统中并把它运用到B3G的系统设计中。

basing on optics orthogonal codes,this paper proposes a new design scheme of three-dimension optics orthogonal codes.in this scheme,the optics orthogonal codes can be coded not only in space-domain,in time-domain,but also in frequency-domain.it has good auto-cross relativity properties.the simulation figures show that can enlarge the coeds capacity and improve the optics optical communications system performance.so it will be of interesting in coming high dense communication system.

摘 要：基于光正交码编码技术，提出了一种新型空/时/频三维ooc的设计方案，对光信号在时、频和空域进行编码，该码具有理想的自/互相关特性。通过仿真比较，在容量和系统的误码率等性能方面比一、二维ooc都有较大的提高，因而能很好地适应未来高密集光纤通信。关键词：三维光正交码；光码分多址；误码率；高密集光纤通信

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。