简

Moreover, we present a sufficient condition for a relative reduct not to be an absolute reduct.

根据有无决策属性之分，信息表可以分成一般信息表和决策表，相应地有绝对属性约简和相对属性约简。

The work of this present paper mainly includes the investigation of the structure of KDD system, the study of the basic concepts of rough set theory, the research of the questions in the heuristic reduct finding algorithms based the rough set theory used in the data reduction and the discretization in the field of KDD, and the development of the system which is used to study the algorithms of the rough set.

论文的主要工作是了解知识发现的体系结构，学习粗糙集理论的基本概念，研究基于粗糙集理论的约简算法在知识发现领域中进行数据约简和离散化两个方面存在的问题，开发用于粗糙集理论算法研究的实验平台。

Also,this paper proves the correctness of the algorithm and uses it to reduce the information system.In subsequent experiment,this paper applies the optimal reduct in classification problem and receives good effect.

通过对相关工作进行比较分析，详细设计并证明了求取该最优约简的算法，并将最优约简运用于分类问题，得到了良好的效果。

A method of polygon simplification based on Strip-Tree in scaleless GIS is presented in this paper through an all-sided analysis of this problem. Maintaining the correctness of the polygon layer's topoloty, it simplifies the polygon layer according to the output scale.

在对此问题进行全面分析的基础上，提出了一种基于Strip-Tree的多边形图层化简策略，在保持输出数据拓扑结构正确的前提下化简多边形图层，且保持了较高的时空效率。

The two programs are Harmonics.m , which plots low order harmonics and Sectorials.m , which plots high order sectorial harmonics.

两个程式分别是 Harmonics.m 和 Sectorials.m ，前者用於绘制低阶简谐波，后者用於绘制高阶扇形简谐波。

Ab stract : Continuous slabΟdeck is an important structural measure for simplyΟsupported girder bridge , but it is easy to be damaged and difficult to be repaired which is a common problem of simple supported beam highway bridge.

桥面连续构造是简支桥梁的一个重要构造措施，但很容易损坏，且易损难修，是公路简支桥梁的通病。

The nonlinear is incarnated when the ball is rolling respectively on three concaves. The track driven by motor is in simple harmonic vibration, and the frequency and amplitude of simple harmonic vibration of the track can be considered as adjusting parameters.

以滚球在3个凹形槽上的受力体现作用的非线性，导轨由电机推动作简谐振动，滚球在导轨上作受迫振动，可以把导轨作简谐振动的频率或振幅作为调整参量。

It is general for Integer GCD algorithms to use one or several basic transformations which reduce the size of the inputs integers, these transformations are denned as Reduction in this paper.

另外，本文给出了约简的定义，整数GCD算法中逐步减小输入整数规模的变换都可以看作约简。

The author innovated forging process of shell of forging - welded hydrogenating reactor which was awarded The First Prize state Science and Technology Development before, by using VE principle.

运用价值工程原理，改进了获国家科技进步一等奖的锻焊结构加氢反应器的简节锻造工艺，创新后的简节锻造工艺又应用在其他两台类似的加氢反应器上，总计降低生产成本1700余万元

This paper mainly studies attribute reduction in concept lattices based on irreducible elements and constructions of attribute reducts.

主要研究了基于不可约元的概念格的属性约简以及属性约简集的构造。

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。