比较函数

In order to study these algorithms systematically and deeply, they are reviewed in this paper based on c-means algorithm, from metrics, entropy, and constraints on membership function or cluster centers. Moreover, the advantages and disadvantages of the typical fuzzy partitional algorithms are discussed.

为了能更为系统和深入地了解这些聚类算法及其性质，本文从改变度量方式、改变约束条件、在目标函数中引入熵以及考虑对聚类中心进行约束等几个方面，对在C-均值算法的基础上得到的基于划分的模糊聚类算法作了综述和评价，对各典型算法的优缺点进行了实验比较分析。

Then, concerning the difficulty of ascertaining hysteresis time of piezometric tube, Genetic Algorithm-Radial Basis Function Neural Network model is developed according as the method that reservior level is rectilinear correlation with piezometric tube level, which not only could be calculated by computer but also is showed logical and feasible.

针对以往监测模型预测精度难以保证的的问题，本文在分析比较了几种土石坝安全监测预报模型的基础上，提出了一种新的安全监测预报模型——遗传回归模型，该模型通过遗传染色体对建模因子进行优选，并在适应度函数中综合考虑模型拟合精度与预测精度平衡。

According to the characteristic of non uniform burnable thickn ess grain propellant, the grain form functions of two elements and three elements polynome are derived and compared.

根据所用粒状药内外弧厚不同的特点，推导了该粒状药二项式与三项式的形状函数，并进行了比较。

In addition, the method of impedance matrix prestorage for composite structures is presented, which largely saves the time of repeatedly computing impedance elements, and the required memory is formulated.

论文对各种类型的时间基函数进行了评估，比较了它们所包含的高频分量；提出了用于金属/介质混合问题的阻抗矩阵预存储的方法，并给出了所需存储空间的计算公式，该方法大大节省了阻抗元素重复计算的时间。

In this chapter, we compare the two different points of the quality economic benefits. We not only establish the econometric model from the traditional viewpoint, but also deduce the econometric model to evaluate the economic benefits of Six Sigma base on the Quality Engineering and Loss Function of Taguchi. Our research has proved that the excess cost decreased quadratically by the increasing of the sigma level.

比较了两种不同的质量经济效益观，不仅建立基于传统观的经济效益计量模型，笔者还基于田口玄一博土的质量工程学和质量损失函数建立六西格玛管理经济效益的计量模型，验证了六西格玛管理的观点，即随着西格玛水平的提高，企业的额外成本呈曲线下降的趋势。

The definition of relative reduct was improved, and the notion of sequential reduct was proposed to deal with real online systems.

通过典型基准函数的测试，结果表明与常规粒子群，遗传算法比较，该方法具有更好的优化性能。

Methods. PSF 1000 analyzer was used to measure retinal image quality for eye of 26 subjects (spherical ranged from –3.00 ~-6.00Ds, astigmatism ranged from –0.75~-3.00Dc) fitted with three forms of full correction in random order : unaided eye, with rigid gas permeable contact lenses and toric soft contact lenses. The modulation transfer function curve was observed, 12 points of the MTF curve ( equivalent 12 points of LogMar VA) was used for analysis. Results.

利用人眼点扩散函数分析系统（PSF-1000）检查和评估26例近视散光患者（年龄18~28岁，球镜–3.00DS~-6.00 DS，角膜散光-0.75DC ~-3.00DC）在裸眼、配戴散光软性角膜接触镜和透氧性硬性角膜接触镜三种全矫状态的光学成像质量，采用26眼屈光介质MTF曲线中的12个点（即分别等同于对数视力表4.0~5.1的12个点）进行比较和统计学分析，为了避免主观误差，三种矫正方式的先后顺序随机选择。

The function most value question is one of quite important contents,the similar trigonometrical function most value also is must often theimportant.

函数的最值问题是比较重要的内容之一，同样三角函数的最值也是非常重要的。

The PVT properties of moist air are calculated by chosen potential function model and modified virial pressure function, results agree well with experiment data.

采用选择的势函数模型以及矫正后的维里压力公式，对湿空气的PVT 参数进行了模拟计算，并与相关实验数据进行了比较。5。

This paper set up a hardware in the loop and real-time simulate test system of 1/4 vehicle suspension.

摘要本文构建了1／4汽车半主动悬架的硬件在环实时仿真试验系统，将S函数编程实现的线性滤波和谐波叠加模拟产生的随机路面激励用于该试验系统中，进行了时间域内路面不平度、磁流变阻尼器、被动悬架和半主动悬架的仿真及试验，采用性能评价指标对悬架性能进行评价，比较优劣。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。