值域

• Scientific and statistical databases ( ssdb ) have following characters , firstly , relation schema is relatively stable , and each attribute has limited candidate values with high redundancy , secondly , new arrival data only append to the end of current data area and do not change the exist data , thirdly , every relation is made up of plenty of attributes , but majority of queries only relative with less attributes and most queries are read - only queries
  科学与统计数据库( scientificandstatisticaldatabase , ssdb )具有如下特点: ( 1 )关系的模式稳定、属性值的值域有限、数据冗余大; ( 2 )新产生的数据只追加到当前数据末尾而不更新已有内容; ( 3 )每个关系都由大量属性组成,但大多数查询只与少数几个属性相关且多为只读操作。
• In the research of value domain segmentation of images , a modified variance algorithm , a subtraction segmentation algorithm and an improved pulse coupled neural networks segmentation algorithm are proposed . in order to successfully implement the space domain segmentation , this paper also develops an algorithm that can distinguish connexity between pixels and extract the feature parameters in one image scanning procedure
  在图像值域分割研究中，根据炸弹在双能量x光图像中的特性，提出了三种分割算法：一种修正的最小类内方差分割算法，一种双能量x光图像差减分割算法，和一种改进的脉冲耦合神经网络图像分割算法。
• The subject is related and has applications to many different branches of pure and applied science such as operator theory , functional analysis , c " - algebras , banach algebras , matrix norms , inequalities , numerical analysis , perturbation theory , matrix polynomials , systems theory , quantum physics , etc . in recent years , the quadratic numerical range , one of the most important generalizations of the numerical range , was put forward in the course of people studying the spectral theory of the block operator matrix to the need of the development of some branches mentioned above
  对它们的研究涉及到了基础数学及应用数学许多不同的分支，诸如算子理论，泛函分析， c ~ * -代数， banach代数，矩阵范数，不等式，数值分析，扰动性理论，矩阵多项式，系统论，量子物理等等，并且在这些分支上面得到了广泛的应用。近年来，为了上述某些数学分支发展的需要，人们在研究分块算子矩阵谱理论的过程中引入了数值域的一个重要推广：二次数值域。
• So , this thesis studies the rapid cost estimation for mass customization with case - based reasoning and proposes corresponding model and arithmetic . base on studying and inheriting existing domestic and international achievement , this thesis ( 1 ) uses logic bom as the precondition and groundwork and introduces the case - based reasoning method ; ( 2 ) proposes double - level cbr model of rapid cost estimation ; ( 3 ) proposes a fuzzy similarity estimation method with the common form of case representation ( without rigid properties range ) in the cbr system and establishes the fuzzy similarity estimation model and general arithmetic ; ( 4 ) analyses examples with the theories and methods mentioned above
  本文在研究、继承已有国内外研究成果的基础上， ( 1 )采用逻辑bom作为本文研究的前提和基础，并引入了基于案例推理的方法； ( 2 )建立了双层基于案例推理的快速成本评估模型和通用算法； ( 3 )应用案例描述的通用形式(没有严格的属性值域) ，在cbr系统中提出了一种模糊相似性评估方法，并建立了模糊案例相似性评估模型和通用算法； ( 4 )运用上述理论与方法，进行了实例分析。
• Statistics and analysis of amplitude domain parameters of the vibration acceleration signal measured during closing of the pump valve shows that , by using this diagnosis method , the feature information of the pump valve failure can be extracted effectively , and the failure information features are rather obvious
  通过对测取的三缸泵阀箱上泵阀关闭过程振动加速度信号的幅值域多参数的统计分析证明，采用振动信号幅值域多参数诊断法可有效提取泵阀失效故障的特征信息，且故障信息特征非常明显。
• The gray level maximum has not been changed in the classical fuzzy enhancement method proposed by s . k . pal , so this kind of image enhancement method is not fit for the enhancement problem of degraded images with less gray levels and low contrasts ; the fact that the value domain of membership function of gray levels is not normalization form , i . e . [ 0 , 1 ] , is another disadvantage of the traditional fuzzy enhancement means
  但是由pal提出的经典模糊增强方法并没有改变图像灰度等级的上界，所以这种增强方法不适合于灰度等级少、对比度低的图像增强问题，并且这种经典模糊增强方法的隶属度函数值域不具有通常的规范形式，即[ 0 ， 1 ]区间。
• As we all know , one of the main aim of the spectral theory research is to find out the location of the spectrum , it is just because of the quadratic numerical range gives a better information about the localization of the spectrum than the numerical range and that provoke my interest to study the quadratic numerical range . the aim of this paper is to make a deep investigate in this area , the main content as follows : the first part of this paper pays the emphasis on the quadratic numerical range
  我们知道，研究谱理论的一个重要目的就是了解谱的位置特征，通过对比可知，二次数值域较之数值域能够更好地给出所给算子的谱的位置特征，这引起了我们的研究兴趣，本文将着重就二次数值域的相关问题进行较深入地研究，同时我们还提出了一些有待解决的问题，我们认为这些问题是值得大家共同去研究和探讨的。