分类空间

One of the most difficulties in document automatic classification is the high dimension of feature space and the sparseness of text representation vector.

文本自动分类问题的最大特点和困难之一是特征空间的高维性和文档表示向量的稀疏性。

A new approach of e-mail classification based on the concept vector space model was proposed.

提出了一个基于概念向量空间模型的电子邮件分类方法。

Especially with the increase in spatial resolution remote sensing images, venation characteristics in the classification of remote sensing images have an increasingly important role.

特别是随着遥感影像空间分辨率的提高，纹理特征在遥感影像分类中的作用越来越重要。

Following Frances Yates(1966), he argues that the taxonomic imagination in the West is strongly visualist in nature, constituting cultures as if they were theaters of memory, or spatialized arrays.

接着弗朗西斯。耶茨（ Yates1966）指出，西方的分类想象本质上是极为视觉至上的，把文化组织得仿佛它们是记忆的剧场，或空间化的阵列。

Mushroom bodies and antennal lobes in Oxycetonia jucunda were conspicuous. Calyces and lobes of the mushroom bodies.were much developed. In contrast, calyces of Ambrostoma quadriimpressum and Henosepilachna vigintioctomaculata were extremely undeveloped. However, the postretinal fibres and circumpharyngeal nerves of Ambrostoma quadriimpressum were highly developed. In the three beetles, 5-HT immunoreactivity was present in all neuropils of the brain and the suboesophageal ganglion. The pattern of 5-HT immunoreactivity and the localization of immunoreactive somata which often clustered into groups were similar among these beetles, while the immunoreactivity intensity was distinct, especially in the lamina.

结果显示，分类地位相近的三种甲虫脑结构大小相差悬殊：小青花金龟脑结构相对发达，蕈形体结构显著，具有发达的冠和叶，嗅叶发达；马铃薯瓢虫和榆紫叶甲的冠极度退化，嗅叶相对不发达；但榆紫叶甲具有十分发达的网膜后纤维和围咽神经。5-HT阳性纤维在三种甲虫的所有神经纤维网中几乎都有分布，且反应模式相似，但各神经纤维网特别是神经节层染色强度差异显著。5-HT阳性胞体有成群分布现象，且在三种甲虫脑中的空间分布位置基本一致。

In this thesis, we focus mainly on exploring index-based skyline algorithms. Taking full use of indexing technology, we study skyline computing in any subspace of high dimensional dataset, the problem of sampling the large-size skyline and skyline computing in categorial database.

利用索引技术，分别解决了高维数据集中任意子空间上的skyline计算问题，查询数据集上skyline点输出数目过多的问题以及分类属性数据集上如何高效、动态地算出其skyline的问题。

On the basis of peak's spatial characteristic, formative characteristic, scale characteristic and clustery characteristic, a systematic classification of peaks is carried out and their quantitative description is brought out on a series of principles.

本文在首先分析了山顶点所具有的空间特征、成因特征、尺度特征及点群特征的基础上，依照科学性、系统性、实用性、可实现性的原则，对山顶点进行了系统的分类，并阐述了其定量描述方法。

Base on comparison with the remote sensing data in 1982 and 2000 and field investigation, the results of land cover and land use change were obtained by the method of landscape analysis. Ten types of land use were identified: riparian woods, riparian shrubbery, desert shrubbery, desert grassland, river-way and water area, salinised land, town, Gobi, shift sand dune, denudative upland. The results show that,(1) there were obvious changes in land cover structure.

根据黑河下游额济纳绿洲土地生态分类，利用1982年与2000年2期TM遥感数据对比和野外实地调查，采用景观生态空间分布格局分析方法，分为河岸乔木林、河岸灌草林、荒漠稀疏灌丛、荒漠稀疏草地、河道与水域、盐碱化土地、城镇、戈壁、流动沙丘和剥蚀地山丘陵，从各类土地分布面积变化和类型转移趋向与幅度两个方面，分析了额济纳绿洲20年来土地覆被变化。

Our main contributions are as follows:① We realized that HTS is common in almost everything;② We generalized that HTS consisted of hyper-node and hyper-line;③ We defined the state space of HTS, and its solution path;④ We studied the comprehensiveness, compatibility, connective capacity, namability, and the classification of HN.

认识到超拓扑结构是客观世界中事物的普遍现象，抽象出HTS=HN+HL。提出了HTS的状态空间与解路径，定义了解路径的承接超结点。对HTSKR进行了形式化的定义，研究了超结点的包容性、包容度、连接性、命名性、分类性等。

Tests indicate the PBT algorithm instance in Network Processor can enable searches at wire speed of up to 50 complicated, intersecting gateway rules, or up to 1000 nonintersecting rules with irregular domains of application.

经过测试验证，本文算法的分组分类查询速度快，占用硬件的内存空间小，在网络处理器上基本能够达到线速处理。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。