查询词典 classification system

The traditional algorithms of classification are no longer suitable because of the effect of the concept drift in data streaming. The research on fast and stable data mining systems with high accuracy has become more valuable in both theory and practice. The effect of low frequency concepts on time and space performance is studied and an LFCR algorithm is proposed in this paper, which reduces the low frequency concept with some mechanisms. The extensive experimental study shows that LFCR has improved performance in classification in comparison with RePro.

由于数据流中概念漂移现象的影响，使得传统的分类方法不再适用，因此研究快速、精确及稳定的数据流挖掘方法和系统具有较高的理论和应用价值；文章研究了基于频度的概念漂移中低频概念对分类时空性能的影响，提出了对其中的低频概念进行消减的算法，实验表明LFCR算法比RePro算法有更好的分类性能。

In view of it is the standard limiting value rather than the normal value in the ground waterquality classification standard, and the stipulation causing inconvenient and chaotic inapplication, this paper putout the ground water quality classification normal value.

针对&地下水质量标准&中规定的是&地下水分类指标标准限值&而常用地下水质量综合评价模型中使用的是&标准值&造成的使用不便和混乱，给出了&地下水质量分类标准值&

Investigate the assisting of the relation and soil and groundwater monitoring data among the surface feature and image established the relation of the spectrum characteristic with surface feature ,using two kinds of classification and improved post-classification, methods lies two respects: 1Salt steep spectrum luminance value curve of ground higher than surface feature average luminance value curve obviously, and other surface feature luminance value lower than or have around average luminance value curve little wave water body mean the land water areas among them obviously, including the river and surface of water , surface of water of the reservoir and hole pool surface of water By view trend of the

从计算结果得出，盐渍地上的NDVI 值分布在一定范围内，这样就可以取一定的阀值，将反射率较低的盐渍地提取出来。根据盐渍地分布与地下水的相互关系，对分类后的图像进行处理，提高了精度。2 充分利用遥感与GIS 技术在地学分析中的优势，计算各类盐渍地面积、荒漠、水体面积变化，分析近三十年来研究区土地盐渍化动态变化的规律，包括面积变化、盐渍化程度的变化，分析大范围时间尺度上土地盐渍化动态发展的整体趋势。

Time-Frequency analysis method is applied to the analysis of PEC signals with the aim of discriminating the occurrence of corrosion from the simultaneous variations of lift-off, smoothed pseudo Wigner-Ville distribution is used to get the signal spectrum map. The method of extracting the lowest energy area as the classification eigenvalue is proposed, and a good classification result is acquired.

采用时频分析的方法对同时出现腐蚀缺陷和提离变化的情况进行了识别，利用平滑的伪Wigner-Ville分布得到了信号的谱图，提出了提取谱图中最低能量区域面积作为特征量进行识别的方法，取得了较好的识别效果。

The upland yellow-red soil as case, the automatic classification techniques for soil type and soil organic matter map at county scale (1:50,000) were developed based on knowledge classification rules and expert classified simulator; The relationship between physico-chemical properties of coastal saline soils and their hyperspectral reflectance were studied; The multi-temporal RS data were used to detect the land use in coastal soil region; The spatial variability and sampling strategy for coastal saline soils were researched.

以滨海盐碱土为对象，在国内系统的开展了盐碱土理化特性和地面土壤高光谱之间的关系研究，并利用不同时相遥感资料进行盐碱土地区农业土地利用制图，研究了盐碱土不同剖面土壤空间变异特性和高效采样策略。

Summarizes classification of railway transportation safety investment and the effect factors, expatiate the structure of safety costs, introducing analysis of safety costs and its implementations on railway corporates' investment decision making and safety management. Furthermore, it analyses classification, implementation, and measurement of economic benefits. It also provides fundamental knowledge in later analysis of derogation and efficiency improvement.

概述了铁路运输业安全投入的分类以及影响安全投入的因素；阐述了安全成本的构成、介绍安全成本分析法并将方法应用于铁路企业的安全投资决策与安全管理工作上；分析了安全投资效益的分类、特点、实现方式以及计量方法，为后面分析安全投资减损、增值效益提供分析方法的支撑。

On the basis of the theory, analyses and grade interval classification are conducted on the size deviation indices in the standard for water-reeled tussah silk. The precision assessment of the classification results between the new and old standards is expected to be helpful to the formulation of a State standard for water-reeled tussah silk.

对生丝抽样检验分级理论在柞蚕丝领域中的可行性进行了探讨，并根据这一理论对柞蚕水缫丝标准中纤度偏差指标进行了分析和等级区间划分；对新、旧标准的分级精度进行了评价；利用所得结果指导柞蚕水缫丝国家标准的制定工作。

In this paper, the author discusses the origin and the development of the aseismic design medel code,approaches the role and the characteristics of the model code, points out the necessity and the ways of drawing up and developing the model code in China, and puts forward a set of relatively complete classification of engineering structure operation function based on the performance design, and proposes the principles, framework and the methods of aseismic design classification.

文摘：论述了抗震设计样板规范的由来和发展，探讨了样板规范的作用和特点，提出了在我国编制和发展样板规范的必要性和途径，且提出了一套较完整的、基于性态设计的工程结构使用功能分类和抗震设计分类的原则、框架和方法。

The method is realized via the following steps: first to apply Isomap or LLE to get the embeddings of the original data set in the low dimensional space; then to obtain support vectors, which are the most significant and intrinsic data for the final classification result, by using support vector machine on these low dimensional embedding data; subsequently to get support vectors in the original high dimensional space based on the corresponding labels of the obtained low dimensional support vectors; finally to apply support vector machine again on these high dimensional support vectors to gain the final classification discriminant function.

数据挖掘是数据库知识发现中最重要的步骤之一，其目标是从获取的数据中高效准确地挖掘出我们所需要的信息。在实际应用中，数据往往呈现海量、高维、非线性等特性，这些特性给数据挖掘带来了很多问题，例如海量特性导致的计算效率低下问题、高维特性带来的维数灾难问题和非线性特性引起的线性模型失效问题等。幸运的是，实际中高维数据的属性之间往往存在一定的规律性和相关性，即实际数据经常存在着外在与内在两个维数。

The central issue of rough sets theory is to classify analysing , a limitation of Pawlak rough sets model is that the classification which it deals with must be totally correct or definite,Because it classified according to the equivalences strictly,so its classification is accurate, namely " include " or not" include ", but the one that does not have to a certain extent" includes " or " belongs to ".

粗糙集理论的中心问题是分类分析，Pawlak粗糙集模型的一个局限性是它所处理的分类必须是完全正确的或肯定的，因为它是严格按照等价类来分类的，因而它的分类是精确的，亦即&包含&或&不包含&，而没有某种程度上的&包含&或&属于&。

Now he worked in ajoint venture.

现在他在一家合资企业工作。

More troops in Afghanistan won't change any of the foregoing.

更多的在阿富汗的军队也不会改变之前的状况。