全文获取类型
收费全文 | 5582篇 |
免费 | 220篇 |
国内免费 | 915篇 |
专业分类
系统科学 | 1551篇 |
丛书文集 | 149篇 |
教育与普及 | 28篇 |
理论与方法论 | 10篇 |
现状及发展 | 45篇 |
综合类 | 4934篇 |
出版年
2024年 | 22篇 |
2023年 | 36篇 |
2022年 | 71篇 |
2021年 | 66篇 |
2020年 | 98篇 |
2019年 | 78篇 |
2018年 | 87篇 |
2017年 | 68篇 |
2016年 | 84篇 |
2015年 | 124篇 |
2014年 | 221篇 |
2013年 | 206篇 |
2012年 | 309篇 |
2011年 | 306篇 |
2010年 | 253篇 |
2009年 | 307篇 |
2008年 | 303篇 |
2007年 | 521篇 |
2006年 | 433篇 |
2005年 | 416篇 |
2004年 | 367篇 |
2003年 | 303篇 |
2002年 | 282篇 |
2001年 | 246篇 |
2000年 | 246篇 |
1999年 | 194篇 |
1998年 | 179篇 |
1997年 | 149篇 |
1996年 | 163篇 |
1995年 | 107篇 |
1994年 | 113篇 |
1993年 | 93篇 |
1992年 | 75篇 |
1991年 | 35篇 |
1990年 | 44篇 |
1989年 | 35篇 |
1988年 | 30篇 |
1987年 | 26篇 |
1986年 | 15篇 |
1985年 | 1篇 |
1981年 | 3篇 |
1955年 | 2篇 |
排序方式: 共有6717条查询结果,搜索用时 0 毫秒
921.
Blind separation of independent sources from their nonlinear convoluted mixtures is a more realistic problem than from linear ones. A solution to this problem based on the Entropy Maximization principle is presented. First we propose a novel two-layer network as the de-mixing system to separate sources in nonlinear convolved mixture. In output layer of our network we use feedback network architecture to cope with convoluted mixtures. Then we derive learning algorithms for the two-layer network by maximizing the information entropy. Based on the comparison of the computer simulation results, it can be concluded that the proposed algorithm has a better nonlinear convolved blind signal separation effect than the H.H. Y' s algorithm. 相似文献
922.
基于扰动观测器的伺服控制器设计及仿真研究 总被引:3,自引:2,他引:1
利用扰动观测器减弱系统的量测噪声和外部扰动,利用抗漂移的状态反馈控制器来减弱驱动饱和的影响,将这两种策略综合用于伺服控制器的设计并重点对这种方案进行了仿真对比研究。仿真结果表明基于扰动观测器的伺服系统在扰动及量测噪声不大,且系统模型参数变化不大的情况下具有较高的动态性能及较高的跟踪精度并能克服饱和约束的不良影响。 相似文献
923.
924.
张磊 《南京邮电大学学报(自然科学版)》2004,24(2):61-65
首先提出了策略控制系统的概念,然后介绍了策略控制系统的框架结构,最后在策略受控路由器中增加策略代理和主控程序模块,完成对IP网QoS(QualityofServices)策略控制系统的设计和仿真。 相似文献
925.
Thomas L. Saaty 《系统科学与系统工程学报(英文版)》2004,13(2):129-157
The Analytic Network Process (ANP) is a multicriteria theory of measurement used to derive relative priority scales of absolute
numbers from individual judgments (or from actual measurements normalized to a relative form) that also belong to a fundamental
scale of absolute numbers. These judgments represent the relative influence, of one of two elements over the other in a pairwise
comparison process on a third element in the system, with respect to an underlying control criterion. Through its supermatrix,
whose entries are themselves matrices of column priorities, the ANP synthesizes the outcome of dependence and feedback within
and between clusters of elements. The Analytic Hierarchy Process (AHP) with its independence assumptions on upper levels from
lower levels and the independence of the elements in a level is a special case of the ANP. The ANP is an essential tool for
articulating our understanding of a decision problem. One had to overcome the limitation of linear hierarchic structures and
their mathematical consequences. This part on the ANP summarizes and illustrates the basic concepts of the ANP and shows how
informed intuitive judgments can lead to real life answers that are matched by actual measurements in the real world (for
example, relative dollar values) as illustrated in market share examples that rely on judgments and not on numerical data.
Thomas L. Saaty holds the Chair of University Professor, Katz Graduate School of Business, University of Pittsburgh, Pittsburgh, PA, and
obtained his Ph.D. in mathematics from Yale University. Before that he was a professor at the Wharton School of the University
of Pennsylvania for ten years. Prior to that he spent seven years at the Arms Control and Disarmament Agency in the State
Department in Washington, DC, that carried out the arms reduction negotiations with the Soviets in Geneva. His current research
interests include decision-making, planning, conflict resolution and synthesis in the brain. As a result of his search for
an effective means to deal with weapons tradeoffs at the Disarmament Agency and, more generally, with decision-making and
resource allocation, Professor Saaty developed The Analytic Hierarchy Process (AHP) and its generalization to dependence and
feedback, the Analytic Network Process (ANP). He is co-developer of the software Expert Choice and of the software Super Decisions
for decisions with dependence and feedback. He has authored or co-authored twelve books on the AHP/ANP. Professor Saaty has
also written a number of other books that embrace a variety of topics, including Modern Nonlinear Equations, Nonlinear Mathematics, Graph Theory, The Four Color Problem, Behavioral Mathematics, Queuing Theory,
Optimization in Integers, Embracing the Future and The Brain: Unraveling the Mystery of How It Works. His most recent book is Creative Thinking, Problem Solving & Decision Making. The book is a rich collection of ideas, incorporating research by a growing body of researchers and practitioners, profiles
of creative people, projects and products, theory, philosophy, physics and metaphysics...all explained with a liberal dose
of humor. He has published more than 300 refereed articles in a wide variety of professional journals. He has been on the
editorial boards of Mathematical Reviews, Operations Research, Naval Research Logistics Quarterly, Mathematical and Computer
Modeling, Socio-Economic Planning Sciences, Applied Mathematics Letters, and several others. He also served as consultant
to many corporations and governments. 相似文献
926.
FENG Junwen 《系统科学与系统工程学报(英文版)》1994,(1)
OrderStructureAnalysis(OSA)fortheOptimalSolutionsofMultipleObjectiveMathematicalProgrammingFENGJunwen(SoftScienceResearchInst... 相似文献
927.
黄铭 《系统工程与电子技术》1990,(9)
本文试图探索一种将军事冲突定量化处理的方法,用以确定某特定国家和地区冲突的程度,引入威胁因子概念,并通过威胁因子的排序结果给该国国防科研项目的排序提供依据。 相似文献
928.
本文给出了定常线性控制系统 x(t)=A~(1)X(t)+A~(2)X(t-τ)+BU(t), Y(t)=CX(t)的闭环系统零解无条件稳定的充分必要条件,所得结果只要进行必要的代数运算就能实现。 相似文献
929.
指出了现行高校电子技术基础教材中作为反馈放大器理论“3项基本假设”所存在的不足,以概括反馈放大器的共性为出发点,提出了“4项基本假设”和理想模型,从而使反馈放大器的理论基础发生了根本性变化,理想的和实际的反馈放大器得到了辩证统一. 相似文献
930.
煤矿生产系统的动态仿真 总被引:1,自引:0,他引:1
本文所述是“智能型矿务局分布式决策支持系统”(IDDSS-mb)的一部分。文中首先对煤矿生产系统进行了分析。继而基于此系统分析、建立了煤矿生产仿真模型体系。随后详细叙述了该模型体系的工作流程,并介绍了系统软件开发的若干关键技术和实际应用情况,最后展望了今后的研究工作。 相似文献