图

However the reachability matrix is difficult to get. It is proved that there is no need to calculate the reachability matrix fur a Directed Acyclic Graph.

证明了对于一类特殊的有向图即有向无环图，应用解释结构建模法无须求解可达矩阵亦可保证建模结构化的实现。

The concepts of acyclic hypergraphs and cyclichypergraphs have been proved very useful in the theory of databases.

无圈超图与有圈超图的概念在数据库理论中非常有用。

The concepts of acyclic hypergraphs and cyclichypergraphs have been proved very ...

无圈超图与有圈超图的概念在数据库理论中非常有用。

The adjacency matrix is origined from graph theory, on which we start our research in this thesis.

这种相邻矩阵的提出是源于图论方法，本文的研究就是基于图论方法之上进行的。

Given an undirected graph,the vertex coloring problem is to assign a different color for vertex mutually adjacent.

图的顶点着色问题是指无向图中任意两个相邻顶点都分配到不同的颜色，这个问题是著名的NP 完全问题，没有非常有效的算法。

In the litereture [2], Zhang Zhongfu introduced the conception of adjacent vertex distinguishing total coloring.

在文献[2]中张忠辅等提出了图的邻点可区别全染色的概念，即：设G是阶至少为2的连通简单图，k是正整数，f是V∪E到{1，2，…，k}的映射。

So far, just have the adjacent vertex distinguishing total chromatic number of graphs such as path, cycle, tree, complete graphs, etc.

由于这种染色有一定难度，目前涉及到的文献极少，仅知路、圈、树、完全图等几类图的邻点可区别全色数。

A kind of on-line gradient learning algorithms based on signal flow graphs isproposed for neural networks on-line training. The signal flow graph and adjoint one of aneural network are used to compute the its gradients.

对于动态神经网络在线学习而言，该算法避免了传统梯度计算中复杂的链式求导过程，利用神经网络的信号流图及其线性的伴随流图，可以直接计算任何变量的梯度信息。

For the structure and installation of complete aerator, please refer to Fig.

整机结构及安装参见图一，齿轮箱结构参见图二。

Based on＂The Data Bank System of the Standard Phonetic Features of Different Level in PSC＂, the thesis analyzes the variants of affricative versus fricative in syllables: z, c ,s - zh, ch, sh - j, q, x which are obscure in physiology; analyzes timbre phonetic variants aroused from the different match of seven main simple vowels and initials as well as the tonal patterns with the help of drawing the synthetic spectrograph and pitch spectrograph. So that the data can be offered to describe phonemes in 396 syllables in common use according to the acoustic analysis.

本文在"普通话水平测试各等级标准语言特征数据库系统"的支持下，通过制作396个常用音节语音样本的音高图和综合语图，考察在普通话教学和测试中从生理角度难以准确把握的一组仅有细微差异的塞擦音和擦音声母z、c、s-zh、ch、sh-j、q、x在音节拼合中的变体；考察7个主要单元音在与不同声母拼合构成的音节中音质上的变化模式；考察四个声调的变化形式，力图从语音声学物理特征角度的分析中为普通话常用音节音位语音规范度的描写提供客观的数据说明。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。