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In modern aircraft design , there is an urgent requirement for accurate , efficient and easy - use aerodynamic data and computational analysis tools . however , the euler codes are not satisfied all the demand for simulating the complex flow - fields . more powerful tools solving navier - stokes ( n - s ) equations are longed for viscous effect , more accurate and more detail information of flow - fields 现代飞机设计迫切需要计算流体力学为其提供准确、高效和实用的气动数据以及流场分析工具,已经不再满足于仅采用euler方程进行数值模拟,它要求数值求解navier - stokes ( n - s )方程组以模拟粘性效应,提供更加准确而详实的流场信息。
Now , there are quite research findings on both the algorithm for weighted association rule and the algorithm for constraint association rule , but there is few algorithm for weighted and constraint association rule . we propose the algorithm for the system of information of computer - saling to think about the different payoff for different fittings of computer and to get only the information that we are interested in . the algorithm is useful for the later management of the saling - computer 目前国内、外对加权关联规则提取算法和约束关联规则提取算法的分别研究已取得了很多成果,但是结合这两种情况,同时考虑加权与约束两个因素的关联规则提取算法还不多见。笔者结合电脑卖场信息支持系统的实际需要,提出了既考虑配件的盈利不同,又兼顾挖掘感兴趣的信息内容的关联规则提取算法。
With the development of the internet technology and digital technology , the requirements on information resources are gradually moving from the traditional form to the digital form . the flood of the world wide construction of digital libraries brings increasing attention to the digitalization of informational resources , and brings an international upsurge of the movement to digitalize the informational resources 随着网络技术和数字技术的发展,人们对信息资源的需求也逐渐由传统形式转变为数字化形式,特别是全球范围的数字图书馆建设的兴起,使得信息资源数字化建设越来越受人们的重视,全球掀起了一场信息资源数字化建设的热潮。
With the coming of information age , more and more people realize the importance of information . useful information hidden in plenty of data needs mining energently . the technology of data mining arises and develops unders such circumstance . the main tast of data mining is to extract or mine the useful information from the data . we can get great amount of data from the computer transaction every day . the data is very useful for us to make decisions on management . the paper concludes and introduces association rule about its concept , sort , model and step for mining the data , measure and some basic algorithm on the basis of the at research . at the same time , we analyse hopfield - network ' smodel , character , energy - function , movement - equation and so on . moreover , to the requirement of the system of information of computer - saling , we have done the following and there are good result . fisrt , considering the weight and constraint , we propose the algorithm for the weighted and constraint association rule 本文首先对数据挖掘中的关联规则和神经网络的已有成果作了详细深入的调研,归纳和整理了关联规则的概念、分类、关联规则挖掘的模型与步骤、关联规则的度量方法以及一些基本算法;还归纳和整理了hopfield网络的模型、特征、能量函数、运动方程等,并在此基础上,结合电脑卖场信息支持系统提出的需求,做了如下工作,并取得了一定的成果和成效: ( 1 )考虑加权与约束两种情况,提出了既带权重又带约束的关联规则提取算法。
Crime on internet results from popularization of computer network covering all over the world . it is an informational revolution that computer network transmits information in velocity scope and accuracy . though emergence of network has been for no long , it has been developed and popularized rapidly , and used in the nation security , army affairs , economy , education and so on , thus propelling the human society forward powerfully 计算机网络在传递信息的速度,广度、精确性等方面都是一场信息的革命,从它产生时起到现在时间虽然不长,然而很快就在社会的各个领域迅速发展和普及,被应用于国防、军事、经济、教育等领域,有力地推动了人类社会的发展和前进。
There are plenty of techniques to get these parameters . of all the techniques , optical in - line holography has some particular advantages : non - destructive , wide size - range of the measured particles , large depth of field , direct reconstruction of 3 - d particle field , high resolution and simple set - up 在众多的测试方法中,激光同轴全息摄影法以其不干扰流场,测量粒子尺寸范围大、拍摄景深大、可再现三维粒子场信息、分辨率高以及光路布置简单等优点得到了广泛的应用。
Those two phases of conjugated shear joints are differ from each other in spatial distribution , which is a reflection of the spatial evolution of the fault zone . it can beinferredfrom the information about macrostructure , superimposed deformation of tectonites , paleotectonic stress field of joints and other related documents that there had been three stages of significant activity since zijingguan fault zone was activated . the first stage was about from middle juiassic to early cretaceous , when the fault zone activated left - laterally under nw - se striking transpression 宏观构造组合特征、构造岩变形叠加信息、节理的古构造应力场信息及前人区域资料表明,紫荆关断裂带自古生代末开始活化以来有三次主要构造活动:第一次是中侏罗世?早白垩世,在北西?南东向近水平挤压作用下,断裂左行压扭性活动,控制太行山地区岩浆岩带及与其相关的接触交代型矿床的形成。
Combine with the project " hf ground wave radar supervise sea status " of state 863 project , retrieving wind direction from hf radar doppler spectrum and the showing of wind field , current field , wave field are researched in this paper . the problem of how to represent the sea surface parameters by computer is concerned , too 本文结合863 - 818 - 01 - 02课题“高频地波雷达海洋环境监测技术” ,研究了由高频雷达海面回波提取风向信息和海面风场、浪场、流场信息的计算机表征方法及其数据传输反演和表征的若干问题。
The strategy of multi - block grid system makes it possible to proceed for structured grid when dealing with great complex geometries , like several components , et al . in order to reduce the computational complexity and computational costs , the fields are solved with " ghost " cells . the implementations with " ghost " cells largely improve the computational efficiency at computers with vetorizing capabilities 采用多块网格技术实现了多部件复杂外形的高质量粘性结构网格生成,拓展了结构网格处理复杂外形的适用范围;采用虚拟网格技术实现了分区计算中流场信息的统一管理,降低了编程难度,极大地提高了计算机矢量运算的效率。
The main objective of the thesis is to design and realize the last three modules and to establish an integrated system using database technology , web programming technique , virtual reality technology and network communication technology . the integrated system " enables one to submit a task , view the state of the submitted task and visualize the 3d unstructured mesh and flow field during calculations 本文的主要工作是结合使用数据库技术、网页编程技术、虚拟现实技术以及网络通信技术完成后三个模块的设计,并构成一个完整的系统,成功地实现了基于web三维流场数值计算过程中的作业提交、作业查看以及非结构网格和流场信息的实时显示。