首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   4851篇
  国内免费   89篇
  完全免费   723篇
  自动化技术   5663篇
  2019年   1篇
  2018年   102篇
  2017年   120篇
  2016年   118篇
  2015年   181篇
  2014年   347篇
  2013年   394篇
  2012年   682篇
  2011年   608篇
  2010年   449篇
  2009年   419篇
  2008年   391篇
  2007年   320篇
  2006年   257篇
  2005年   151篇
  2004年   119篇
  2003年   111篇
  2002年   87篇
  2001年   58篇
  2000年   56篇
  1999年   71篇
  1998年   54篇
  1997年   67篇
  1996年   58篇
  1995年   41篇
  1994年   44篇
  1993年   40篇
  1992年   41篇
  1991年   31篇
  1990年   50篇
  1989年   40篇
  1988年   30篇
  1987年   23篇
  1986年   19篇
  1985年   9篇
  1984年   10篇
  1983年   4篇
  1982年   7篇
  1981年   3篇
  1980年   3篇
  1979年   6篇
  1978年   8篇
  1977年   7篇
  1976年   3篇
  1975年   3篇
  1974年   1篇
  1973年   6篇
  1972年   2篇
  1971年   4篇
  1970年   1篇
  1969年   2篇
  1967年   1篇
  1966年   1篇
  1964年   1篇
  1963年   1篇
排序方式: 共有5663条查询结果,搜索用时 46 毫秒
1.
A modified genetic algorithm for optimal control problems   总被引:61,自引:0,他引:61  
This paper studies the application of a genetic algorithm to discrete-time optimal control problems. Numerical results obtained here are compared with ones yielded by GAMS, a system for construction and solution of large and complex mathematical programming models. While GAMS appears to work well only for linear quadratic optimal control problems or problems with short horizon, the genetic algorithm applies to more general problems equally well.  相似文献
2.
Perfect image segmentation using pulse coupled neural networks   总被引:60,自引:0,他引:60  
This paper describes a method for segmenting digital images using pulse coupled neural networks (PCNN). The pulse coupled neuron (PCN) model used in PCNN is a modification of the cortical neuron model of Eckhorn et al. (1990). A single layered laterally connected PCNN is capable of perfectly segmenting digital images even when there is a considerable overlap in the intensity ranges of adjacent regions. Conditions for perfect image segmentation are derived. It is also shown that addition of an inhibition receptive field to the neuron model increases the possibility of perfect segmentation. The inhibition input reduces the overlap of intensity ranges of adjacent regions by effectively compressing the intensity range of each region.  相似文献
3.
基于置乱与融合的数字图象隐藏技术及其应用   总被引:38,自引:4,他引:34       下载免费PDF全文
文中首先介绍数字图象的置乱与融合,并基于数字图象的置乱与融合,提出了一种数字图象隐藏方法,在该方法中,地数字图象隐藏的预处理和后处理融合用于将一幅图象隐藏于别一幅图象之中,其次介绍所提出的数字图象隐藏方法,探讨了该方法在数字图象分存与数字水印技术中的应用,实例分析显示,证明该方法可以方便地实现并且具有一定程度的鲁棒笥。  相似文献
4.
The CN2 Induction Algorithm   总被引:31,自引:0,他引:31  
5.
A sorting classification of parallel rendering   总被引:25,自引:0,他引:25  
We describe a classification scheme that we believe provides a more structured framework for reasoning about parallel rendering. The scheme is based on where the sort from object coordinates to screen coordinates occurs, which we believe is fundamental whenever both geometry processing and rasterization are performed in parallel. This classification scheme supports the analysis of computational and communication costs, and encompasses the bulk of current and proposed highly parallel renderers - both hardware and software. We begin by reviewing the standard feed-forward rendering pipeline, showing how different ways of parallelizing it lead to three classes of rendering algorithms. Next, we consider each of these classes in detail, analyzing their aggregate processing and communication costs, possible variations, and constraints they may impose on rendering applications. Finally, we use these analyses to compare the classes and identify when each is likely to be preferable  相似文献
6.
Seeded region growing   总被引:24,自引:0,他引:24  
We present here a new algorithm for segmentation of intensity images which is robust, rapid, and free of tuning parameters. The method, however, requires the input of a number of seeds, either individual pixels or regions, which will control the formation of regions into which the image will be segmented. In this correspondence, we present the algorithm, discuss briefly its properties, and suggest two ways in which it can be employed, namely, by using manual seed selection or by automated procedures  相似文献
7.
Beware of q2!   总被引:23,自引:0,他引:23  
8.
Adaptive Intrusion Detection: A Data Mining Approach   总被引:22,自引:0,他引:22  
In this paper we describe a data mining framework for constructingintrusion detection models. The first key idea is to mine system auditdata for consistent and useful patterns of program and user behavior.The other is to use the set of relevant system features presented inthe patterns to compute inductively learned classifiers that canrecognize anomalies and known intrusions. In order for the classifiersto be effective intrusion detection models, we need to have sufficientaudit data for training and also select a set of predictive systemfeatures. We propose to use the association rules and frequentepisodes computed from audit data as the basis for guiding the auditdata gathering and feature selection processes. We modify these twobasic algorithms to use axis attribute(s) and referenceattribute(s) as forms of item constraints to compute only therelevant patterns. In addition, we use an iterative level-wiseapproximate mining procedure to uncover the low frequency butimportant patterns. We use meta-learning as a mechanism to makeintrusion detection models more effective and adaptive. We report ourextensive experiments in using our framework on real-world audit data.  相似文献
9.
多传感器信息融合基本原理及应用   总被引:21,自引:0,他引:21  
马平  吕锋  杜海莲  王瑞  牛成林 《控制工程》2006,13(1):48-51,77
全面系统地阐述了多传感器信息融合技术的信息融合理论、模型、算法和应用,并对目前信息融合在机器人、故障诊断、图像处理等领域的应用现状进行了剖析。信息融合技术虽然发展迅速。但由于信息融合技术理论尚待完善,在融合算法、融合模型以及关联的二义性等方面还存在问题。信息融合理论在多传感器分布检测、异类多传感器融合以及建立信息融合数据库和知识库等方面将有进一步发展。  相似文献
10.
遗传算法的编码理论与应用   总被引:21,自引:0,他引:21  
编码是遗传算法求解问题的前提,文章分析了二进制编码、格雷码编码、实数编码、符号编码、排列编码、二倍体编码、DNA编码、混合编码、二维染色体编码或矩阵编码等编码的实质内容,在树编码和可变长编码基础上阐述了自适应编码的基本理论,提出了基于相似度的可变长编码和基于结构的agent编码方式,给出了函数优化、TSP、KP、JSP、机器人路径规划、图的划分和倒立摆等典型优化问题的编码方案。  相似文献
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号