共查询到20条相似文献,搜索用时 734 毫秒
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现有的自监督学习算法对小样本合成孔径雷达(Synthetic Aperture Radar,SAR)图像表征能力不足,无法充分地满足自动目标识别(Automatic Target Recognition,ATR)性能的需求。因此,本文提出了一种基于孪生自监督学习的SAR ATR方法。首先,将无标注SAR数据通过孪生特征提取网络模块中的数据增强方式建立正负样本对;其次,通过孪生自监督学习模块中的对比学习头部网络和特征冗余降低头部网络,依据无监督对比学习损失函数和特征信息冗余损失函数进行联合优化,进而得到具有较好表征能力的预训练网络;最后,将自监督预训练网络权重加载到下游网络中,并通过交叉熵损失对下游网络进行小样本SAR图像有监督识别。实验结果表明,对于运动与静止目标获取和识别(Moving and Stationary Target Acquisition and Recognition,MSTAR)数据集,本文的方法仅在3.13%的训练数据上可达82.95%准确率。本文所提方法可在无标注数据中获得较好的表征能力,有效地改善小样本SAR图像识别的过拟合问题。 相似文献
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通过引入模糊数学中的模糊综合评价方法,为传输网评估建立了科学的模糊综合评价模型,包括按照网络实际选取适合的评估指标、确定指标权重,对现有网络结构进行评估测试和应用,取得良好效果,对完善网络布局、提高资源利用率、合理科学地优化网络具有重要意义. 相似文献
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为了解决目前目标识别方法应用平台难以实现小体积、低成本的问题,利用线扫描完成激光引信的探测成像,得到了DHGF算法的样本矩阵,建立了基于激光线扫描成像引信的四元评价算法对典型目标的识别模型。该模型使用德尔菲法确定目标轮廓相似度指标集;采用层次分析法确定指标权重分配;运用灰色系统理论确定评价灰类,得到单因素模糊评判矩阵;通过模糊数学理论得出目标识别的评价结果。该算法克服了在小样本数据的情况下,目标识别过程中的模糊性、不确定性等问题,并完成了对典型目标的仿真。仿真结果表明:该算法具备对典型目标的识别能力,可为激光扫描成像引信目标识别提供参考。 相似文献
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基于聚类模糊神经网络的非线性电路故障诊断 总被引:4,自引:5,他引:4
提出了一种基于聚类算法和模糊神经网络的非线性模拟电路故障诊断方法。通过一个无监督的聚类算法自组织地确定模糊规则的数目并生成一个初始的故障诊断模糊规则库,构造了一类模糊神经网络,通过训练调整网络权值,使故障诊断模糊规则库的分类更加精确,并通过仿真实验验证了该方法的有效性。 相似文献
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Giles C.L. Omlin C.W. Thornber K.K. 《Proceedings of the IEEE. Institute of Electrical and Electronics Engineers》1999,87(9):1623-1640
Neurofuzzy systems-the combination of artificial neural networks with fuzzy logic-have become useful in many application domains. However, conventional neurofuzzy models usually need enhanced representation power for applications that require context and state (e.g., speech, time series prediction, control). Some of these applications can be readily modeled as finite state automata. Previously, it was proved that deterministic finite state automata (DFA) can be synthesized by or mapped into recurrent neural networks by directly programming the DFA structure into the weights of the neural network. Based on those results, a synthesis method is proposed for mapping fuzzy finite state automata (FFA) into recurrent neural networks. Furthermore, this mapping is suitable for direct implementation in very large scale integration (VLSI), i.e., the encoding of FFA as a generalization of the encoding of DFA in VLSI systems. The synthesis method requires FFA to undergo a transformation prior to being mapped into recurrent networks. The neurons are provided with an enriched functionality in order to accommodate a fuzzy representation of FFA states. This enriched neuron functionality also permits fuzzy parameters of FFA to be directly represented as parameters of the neural network. We also prove the stability of fuzzy finite state dynamics of the constructed neural networks for finite values of network weight and, through simulations, give empirical validation of the proofs. Hence, we prove various knowledge equivalence representations between neural and fuzzy systems and models of automata 相似文献
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研究了将ARTMAP神经网络与模糊规则相结合的字符识别方法.ARTMAP用于对字符的学习、训练,而模糊规则和ARTMAP共同用于对字符的智能识别.实验证明这种将模糊技术与神经网络相结合的混合系统具有较高的识别率和较快的识别速度,采用ARTMAP神经网络只需要较少的网络训练时间. 相似文献
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智能小车把超声波传感器和红外传感器相结合来感知外界环境的信息,并按照一定的规则来调整小车的方位角和速度,实现智能小车的自主导航和避障。模糊神经网络作为人工智能的分支,兼具模糊逻辑系统和神经网络各自的优点,具有表达和处理确定的信息、模糊信息的能力和良好的学习能力等特点。把模糊逻辑系统和神经网络结合起来,运用到智能小车避障的自适应控制中,并且使用一种多层前馈型神经网络即BP神经网络在模糊神经系统中解决神经网络的权系数优化问题。 相似文献
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Mu-Chun Su 《IEEE transactions on systems, man and cybernetics. Part C, Applications and reviews》2000,30(2):276-281
Gesture based applications widely range from replacing the traditional mouse as a position device to virtual reality and communication with the deaf. The article presents a fuzzy rule based approach to spatio-temporal hand gesture recognition. This approach employs a powerful method based on hyperrectangutar composite neural networks (HRCNNs) for selecting templates. Templates for each hand shape are represented in the form of crisp IF-THEN rules that are extracted from the values of synaptic weights of the corresponding trained HRCNNs. Each crisp IF-THEN rule is then fuzzified by employing a special membership function in order to represent the degree to which a pattern is similar to the corresponding antecedent part. When an unknown gesture is to be classified, each sample of the unknown gesture is tested by each fuzzy rule. The accumulated similarity associated with all samples of the input is computed for each hand gesture in the vocabulary, and the unknown gesture is classified as the gesture yielding the highest accumulative similarity. Based on the method we can implement a small-sized dynamic hand gesture recognition system. Two databases which consisted of 90 spatio-temporal hand gestures are utilized for verifying its performance. An encouraging experimental result confirms the effectiveness of the proposed method 相似文献