分组

This paper proposes an algorithm of division and multi-level clustering with multi-strategy optimization,which bases on study of today's mature algorithms.

本文在研究已有成熟算法的基础上，提出了基于分治多层聚类的话题发现算法，其核心思想是把全部数据分割成具有一定相关性的分组，对各个分组分别进行聚类，得到各个分组内部的话题，然后对所有的微类再进行聚类，得到最终的话题，在聚类的过程中采用多种策略进行优化，以保证聚类的效果。

The relates to the prevention of channel package losing in audio code transmission, featuring in the BCH encoding for each audio parameter for barrel shape displacement superposition, packing and channel transmission.

抗信道恶劣丢包伴随误码的语音编码传输方法属于语音编码传输抗差错技术领域，其特征在于，该方法在编码端对语音参数码流分组并对每个分组进行BCH编码，然后对信道编码后的数据分组进行桶形移位联合叠加，打包合路送信道传输。

With regard to Space Club Convergence the thesis deems that its distinguishing should abide by firstly using Exploratory Spatial Data Analysis to divide space regional groups and then choosing suitable spatial autoregressive model or spatial error model and spatial cross-regressive model to examine Space Club Convergence in the same group.

在对区域分组方法的讨论中，本文通过对各种方法的优缺点的比较后认为，能够充分考虑各种经济增长影响因素的相似性，并提取分组过程中各因素重要性的分类回归树分析方法是较适合时间俱乐部趋同的区域分组方法。

In this paper, new classes of linear block codes over finite fields of the algebraicinteger ring of quadratic number fields Qd~(1/2 modulo irreducible elements with norm p or p~2 are presented. These codes can correct one error which takes from the cyclic subgroup of the multiplicative group of the finite fields. The results presented in this paper extend the corresponding results of previous papers.

在处理适用于二维信号的线性分组码时，我们考虑类数为1的有理数域二次扩域Qd~(1/2的代数整数环，利用范数为p或p~2的不可约元构造有限域，给出剩余类域的一组完全陪集代表元系，从而构造出一类有限域上的线性分组码，当错误取值于有限域乘法群的一个循环子群时，所得到的适用于二维信号的线性分组码可以纠单个错，推广了文[14-16]的结果。

An almost perfect nonlinear exponential permutation with high algebric degree is proposed, with some discussion on how to select the parameters of such permutation. The experimental result shows us a conjecture that there exists no such permutation over even dimensional space.

作者所取得的主要研究结果如下：(1)讨论了分组密码的条件攻击和技术攻击方法；全面总结了分组密码算法设计应当遵循的七项准则；概括了分组密码的四种强化技术；设计了一种新的三重加密方案NTE。

At last, this article discusses the coding method of STBC and introduces a new imbed coding method and give a simple decoding method.

最后探讨了空时分组码的编码方法，具体给出了一种简单的四发射天线传输实矩阵的编码方法并提出了一种基于嵌入码的准正交空时分组码的设计方法，并给出了一种比较简单的空时分组码的译码方法。

The diffusion structure has important impact on the rate of the diffusion and safety intensity for block cipher.Using the linear transform which has branch numbers as large as possible as the diffusion structure is a main method to devise block cipher.The linear transform is usually achieved by constructing the invertible matrix.

扩散结构的好坏直接影响了分组密码的扩散速度和安全强度，以分支数尽可能大的线性变换为分组密码算法的扩散结构是设计分组密码的一种重要方法，线性变换的构造可通过可逆矩阵的构造完成。

I will introduce a method to solve this problem when data come from some common life distribution, such as Weibull distribution and Lognormal distribution. In chapter 1, we introduce background of grouped data and how to analyze them with classical methods. In chapter 2, we introduce EM algorithm and show that the estimation of the parameters get through this algorithm is convergent under certain conditions. In chapter 3, we use EM algorithm to estimate parameters in Weibull distribution and Lognormal distribution by grouped data and the simulation shows this method is available.

第一章首先介绍分组数据问题的背景以及如何利用经典的统计方法对分组数据进行分析，并指出分析过程中所遇到的困难；第二章将介绍一种处理不完全数据时的常用算法，EM算法，并说明利用这种算法所得到的估计具有良好的收敛性；第三章将利用EM算法对基于分组数据的威布尔分布和对数正态分布进行参数估计，并进行模拟表明此方法的可行性与有效性。

Methods: With the Child Behavior Checklist and Conners Parent Symptom Questionnaire, two groups of students, including high aggression group and low aggression group, were selected from 311 primary school students, and the two groups were tested with the Rorschaeh test.

用Achenbach儿童行为量表和Conners教师问卷对湖南某地一小学311名同学进行筛选，筛选出攻击高分组(N=33)与低分组(N=35)，对这两组学生进行罗夏测验，回收有效数据，得到最后的高分组(N=30)和低分组(N=30)。

In our approach, a two-block message is still needed to produce a collision, the first block being only one MSB different while the second block remains the same.

本文所提出的1-MSB输入差分碰撞技术中，仍然采用两个消息分组，但其中第一个分组仅第九个消息字的最高位需要差分，而第二个消息分组可无需差分，即第二个消息分组碰撞是一个伪碰撞（Pseudo-collision）。

Lugalbanda was a god and shepherd king of Uruk where he was worshipped for over a thousand years.

Lugalbanda 是神和被崇拜了一千年多 Uruk古埃及喜克索王朝国王。

I am coming just now,' and went on perfuming himself with Hunut, then he came and sat.

我来只是现在，'歼灭战perfuming自己与胡努特，那麼，他来到和SAT 。