共查询到19条相似文献,搜索用时 759 毫秒
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针对一类状态不可测的单输入单输出非线性不确定系统,提出了一种基于最小二乘支持向量机(LS-SVM)的直接自适应H∞输出反馈控制方法.该方法首先设计一种误差观测器,间接地估计出系统的状态;然后利用LS-SVM构造白适应控制器,并给出了LS-SVM权向量和偏移值的在线学习规则,通过引入如控制器减弱外部干扰及LS-SVM近似误差对输出误差的影响,利用李亚普诺夫理论证明了整个闭环系统的稳定性.仿真研究表明了该控制方案的可行性和有效性. 相似文献
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PID控制是应用最为广泛的控制方法,由于系统中存在非线性和时变性,影响建立精确的模型,系统性能.为了解决控制参数整定,改善系统性能,提出一种基于支持向量机的PID控制器参数整定方法.通过将支持向量机和PID控制器相结合建立支持向量机的参数整定模型,在控制过程中将PID控制的参数作为支持向量机的输入,构造参数自适应学习的PID控制器,在控制过程中动态调整PID的三个控制参数,进行仿真的在线整定.仿真结果表明,支持向量机的PID控制方法在处理非线性和时变系统时,提高了实时性能,增强系统稳定性,并获得更好的控制效果,为通用非线性PID控制器设计提供了依据. 相似文献
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本文研究了基于支持向量机回归自适应逆控制的混沌控制方法,用支持向量机建立系统的辨识器,同时在控制过程可逆的条件下设计基于支持向量回归的系统逆控制器.将该自适应逆控制的方法应用于Lorenz混沌系统的控制,仿真结果表明在系统带有不确定性和测量噪声的情况下,该方法可以有效的将混沌系统的状态控制到给定状态. 相似文献
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Guang-Hong Wang Ping Jiang Zu-Ren Feng 《国际自动化与计算杂志》2006,3(3):282-290
A support vector rule based method is investigated for the construction of motion controllers via natural language training. It is a two-phase process including motion control information collection from natural language instructions, and motion information condensation with the aid of support vector machine (SVM) theory. Self-organizing fuzzy neural networks are utilized for the collection of control rules, from which support vector rules are extracted to form a final controller to achieve any given control accuracy. In this way, the number of control rules is reduced, and the structure of the controller tidied, making a controller constructed using natural language training more appropriate in practice, and providing a fundamental rule base for high-level robot behavior control. Simulations and experiments on a wheeled robot are carried out to illustrate the effectiveness of the method. 相似文献
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文章探讨了如何让在手语新闻播报中的卡通人按照自然手语的语法规则而非正常人的语法规则来打手语。首先整理了现代汉语自然手语的规则并将其形式化,并建立了正常汉语到汉语自然手语转换的形式规则库;从而实现了现代汉语文本到相应的自然手语的手语动作序列的自动生成。最后将其嵌入到通过手语合成技术和卡通动画的手语新闻播报系统中,使其在线输出的是符合聋人习惯的自然手语。 相似文献
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针对控制系统中对象的模糊性和动态性,基于动态模糊集(Dynamic Fuzzy Sets)及动态模糊逻辑(Dynamic FuzzyLogic)系统理论,给出DF控制推理模型的相关概念,如DF向量、DF语言变量、DF语言规则和DF蕴涵关系等,并在此基础上探讨基于DF语言规则的DF推理方法,最后通过实例说明这些概念和方法的应用。 相似文献
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基于深度学习的语言模型研究进展 总被引:1,自引:0,他引:1
语言模型旨在对语言的内隐知识进行表示,作为自然语言处理的基本问题,一直广受关注.基于深度学习的语言模型是目前自然语言处理领域的研究热点,通过预训练-微调技术展现了内在强大的表示能力,并能够大幅提升下游任务性能.本文围绕语言模型基本原理和不同应用方向,以神经概率语言模型与预训练语言模型作为深度学习与自然语言处理结合的切入点,从语言模型的基本概念和理论出发,介绍了神经概率与预训练模型的应用情况和当前面临的挑战,对现有神经概率、预训练语言模型及方法进行对比和分析.我们又从新型训练任务和改进网络结构两方面对预训练语言模型训练方法进行详细阐述,并对目前预训练模型在规模压缩、知识融合、多模态和跨语言等研究方向进行概述和评价.最后总结语言模型在当前自然语言处理应用中的瓶颈,对未来可能的研究重点做出展望. 相似文献
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This paper addresses the problem of transforming business specifications written in natural language into formal models suitable for use in information systems development. It proposes a method for transforming controlled natural language specifications based on the Semantics of Business Vocabulary and Business Rules standard. This approach is unique in combining techniques from Model-Driven Engineering (MDE), Cognitive Linguistics, and Knowledge-based Configuration, which allows the reliable semantic processing of specifications and integration with existing MDE tools to improve productivity, quality, and time-to-market in software development. The method first learns the vocabulary of the specification from glossary-like definitions then parses the rules of the specification and outputs the resulting formal SBVR model. Both aspects of the method are tested separately, with the system correctly learning 98% of the vocabulary and correctly interpreting 98% of the rules of an SBVR SE based example. Finally, the proposed method is compared to state-of-the-art approaches for creating formal models from natural language specifications, arguing that it meets the criteria necessary to fulfil the three goals of (1) shifting control of specification to non-technical business experts, (2) reducing the manual effort involved in formalising specifications, and (3) supporting business experts in creating well-formed sets of business vocabularies and rules. 相似文献
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感知器(perceptron)是神经网络模型中的一种,它可以通过监督学习(supervised learning)的方法建立模式识别的能力.将感知器应用到语言模型的训练中,实现了感知器的两种不同训练规则以及多种特征权值计算方法,讨论了不同的训练参数对训练效果的影响.在训练之前,使用了一种基于经验风险最小化(empirical risk minimization,ERM)的特征选择算法确定特征集合.感知器训练之后的语言模型在日文假名到汉字(kana-kanji)的转换中进行评估.通过实验对比了感知器的两种训练规则以及变形算法的性能,同时发现通过感知器训练的模型比传统模型(N-gram)在性能上有了很大的提高,使相对错误率下降了15%~20%. 相似文献
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We describe a novel approach that allows humanoid robots to incrementally integrate motion primitives and language expressions, when there are underlying natural language and motion language modules. The natural language module represents sentence structure using word bigrams. The motion language module extracts the relations between motion primitives and the relevant words. Both the natural language module and the motion language module are expressed as probabilistic models and, therefore, they can be integrated so that the robots can both interpret observed motion in the form of sentences and generate the motion corresponding to a sentence command. Incremental learning is needed for a robot that develops these linguistic skills autonomously . The algorithm is derived from optimization of the natural language and motion language modules under constraints on their probabilistic variables such that the association between motion primitive and sentence in incrementally added training pairs is strengthened. A test based on interpreting observed motion in the forms of sentence demonstrates the validity of the incremental statistical learning algorithm. 相似文献