关键词： 人工神经网络   BP算法   BP网络   BP学习算法   误差反应传播算法   数学推导  

摘要： 提供了人工神经网络的一种算法-误差反向传播算法的数学推导方法及上机实现步骤.

关键词： Web   数学模型   算法   Internet   数据挖掘   数据库   关联规则  

摘要： 本文首先分析了Web用法挖掘的数据源——Web日志文件的内容和格式,建立了一种适用于Web用法挖掘的关联挖掘数学模型DPR,并利用深度优先搜索算法进行了仿真实验。

关键词： partial differential equation   involution   completion   Cartan-Kuranishi theorem   involutive basis   delta-regularity  

摘要： We describe an adaption of a differential algebraic completion algorithm for linear systems of partial differential equations that allows us to deduce intrinsic differential geometric information like the number of prolongations and projections needed for the completion. This new hybrid algorithm represents a much more efficient realisation of the classical Cartan-Kuranishi completion than previous purely geometric ones. A classical problem in geometric completion theory is the existence of delta-singular coordinate systems in which the algorithms do not terminate. We develop a new and a very simple criterion for delta-singularity based on a comparison of the Janet and the Pommaret division. This criterion can also be used for the direct construction of delta-regular coordinates.

关键词： Detector arrays   Digital imaging   Image detection systems   Image quality   Imaging systems   Motion estimation  

摘要： A scene-based algorithm is developed to compensate for bias nonuniformity in focal-plane arrays. Nonuniformity can be extremely problematic, especially for mid- to far-infrared imaging systems. The technique is based on use of estimates of interframe subpixel shifts in an image sequence, in conjunction with a linear-interpolation model for the motion, to extract information on the bias nonuniformity algebraically. The performance of the proposed algorithm is analyzed by using real infrared and simulated data. One advantage of this technique is its simplicity;it requires relatively few frames to generate an effective correction matrix, thereby permitting the execution of frequent on-the-fly nonuniformity correction as drift occurs. Additionally, the performance is shown to exhibit considerable robustness with respect to lack of the common types of temporal and spatial irradiance diversity that are typically required by statistical scene-based nonuniformity correction techniques. (C) 2002 Optical Society of America.

关键词： 带平衡约束的数学规划   互补问题   信赖预算法  

摘要： 本文提出了一种新的求解带互补约束的数学规划的信赖域算法并在不要求严格互补条件下证明了它的收敛性。

关键词： 人工神经网络   润滑油   使用寿命   估计   设备   数学算法  

摘要： 本文从润滑油最佳利用的角度出发 ,提出了基于BP神经网络的润滑油使用寿命的估计方法 ,并给出了应用实例。

关键词： 版面分析   数学形态学   搜索算法   光学字符识别   膨胀算法   名片版面图像   银行票据  

摘要： 目前版面分析的基本思想有以下三个主要方向：自顶向下的方法、自底向上的方法和混合法,分别适用于不同的版面情况.\n该文提出了一种新的基于数学形态学和搜索算法的版面分析方法.该方法是以自底向上为主,同时结合了数学形态学的思想.利用数学形态学的膨胀运算和搜索算法,实现对复杂版面进行快速准确的分析.与以前的版面分析方法不同,该文提出的方法先对版面图像进行膨胀运算,获得小连通区域.该方法不是以一个单独的黑点为搜索对象,而是以一个黑色象素块为对象进行搜索,因而速度比较快,效率比较高.该文在应用数学形态学的膨胀算法的时候,在实际应用过程中对其进行了改进.改进后的算法速度更快,效率更高.

关键词： 数学建模意识   技能训练   《乘法的一些简便算法》   小学数学   教学设计  

摘要： 一股新鲜的教学改革气息伴随着《课程标准》的学习与实践正扑面而来,教师的教学观念亟须更新,要树立新型课程观、教学观、学生观,使《课程标准》教学理念真正在教学实践中得到落实。下面,就“乘法的一些简便算法”教学中两种不同教学方式的比较,谈谈自己对如何转变教学方式,建立新型学科教学理念的实践与思考。

关键词： 测量   原油   含水率   含气率   数学算法   γ射线   透射计数   数据拟合   逃逸效应  

摘要： 详细分析了利用 γ射线测量原油含水率和含气率的数学算法 ,以及减小逃逸效应对系统精度的影响。该方法已被成功地用于油田生产中对油水气三相介质的自动在线计量系统。

关键词： hardware/software co-design   hardware/software partition   program algebra  

摘要： Hardware and software co-design is a design technique which delivers computer systems comprising hardware and software components. A critical phase of the co-design process is to decompose a program into hardware and software. This paper proposes an algebraic partitioning algorithm whose correctness is verified in program algebra. The authors introduce a program analysis phase before program partitioning and develop a collection of syntax-based splitting rules. The former provides the information for moving operations from software to hardware and reducing the interaction between components, and the latter supports a compositional approach to program partitioning.