共查询到19条相似文献,搜索用时 203 毫秒
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用DSP实现光栅高准确度细分技术 总被引:1,自引:0,他引:1
对提高光栅的细分准确度进行了研究,提出了一种查表和插值相结合的方法,并用该方法设计了一个光栅测量系统,系统采用硬件对光栅莫尔条纹进行二细分和判向、用高速并行A/D转换器进行数据采样、用数字信号处理器完成插值算法,具有高速、高准确度的特点。 相似文献
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在激光衍射法测量微细线径的基础上,提出用硬件插值细分的方法来确定衍射图样暗纹间距。介绍了激光衍射法测量微细直径的原理,分析了图像传感器的功能和硬件插值细分的机理,给出了插值细分的电路框图。实验结果表明:采用插值细分的方法能够提高图像传感器的分辨力和细丝直径的测量精度。 相似文献
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基于模糊神经网络的温度控制系统研究 总被引:1,自引:1,他引:0
在硬件系统不变的情况下提出一种新型温度控制方案,结合自适应模糊控制和神经网络,用神经网络的学习能力计算出隶属度函数参数及相应的模糊规则,达到更高的控制精度。并运用Matlab中自适应神经网络模糊推理系统ANFIS对系统进行了仿真,研究表明系统具有极强的适应能力和稳定性。 相似文献
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在无线传感器网络数据融合算法中,BP神经网络被广泛用于节点数据的特征提取和分类。为了解决BP神经网络收敛慢,易陷入局部最优值且泛化能力差从而影响数据融合效果的问题,提出一种将深度学习技术和分簇协议相结合的数据融合算法SAESMDA。SAESMDA用基于层叠自动编码器(SAE)的深度学习模型SAESM取代BP神经网络,算法首先在汇聚节点训练SAESM并对网络分簇,接着各簇节点通过SAESM对采集数据进行特征提取,之后由簇首将分类融合后的特征发送至汇聚节点。仿真实验表明,和采用BP神经网络的BPNDA算法相比,SAESMDA在网络能耗大致相同的情况下具有更高的特征提取分类正确率。 相似文献
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Sequential modeling of a low noise amplifier with neural networks and active learning 总被引:1,自引:0,他引:1
Dirk Gorissen Luciano De Tommasi Karel Crombecq Tom Dhaene 《Neural computing & applications》2009,18(5):485-494
The use of global surrogate models has become commonplace as a cost effective alternative for performing complex high fidelity
computer simulations. Due to their compact formulation and negligible evaluation time, global surrogate models are very useful
tools for exploring the design space, what-if analysis, optimization, prototyping, visualization, and sensitivity analysis. Neural networks have been proven particularly
useful in this respect due to their ability to model high dimensional, non-linear responses accurately. In this article, we
present the results of an extensive study on the performance of neural networks as compared to other modeling techniques in
the context of active learning. We investigate the scalability and accuracy in function of the number design variables and
number of datapoints. The case study under consideration is a high dimensional, parametrized low noise amplifier RF circuit
block. 相似文献
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José M. Martínez-Villena Alfredo Rosado-Muñoz Emilio Soria-Olivas 《Applied Intelligence》2014,41(1):184-195
Recently appeared a renewed interest for Single Layer Feedforward Neural Network (SLF-NN) models where the hidden layer coefficients are randomly assigned and the output coefficients are calculated by a least square algorithm. In addition to random coefficient initialization, the main advantages for these learning models are the speed of training (no multiple iterations required) and no initial coefficient definition (e.g. no adaptation constant as in multilayer perceptron). These features are adequate for real time operation since a fast online training can be achieved, benefiting to applications (industrial, automotive, portable systems) where other neural networks learning approaches could not be used due to large resource usage, low speed and lack of flexibility. Thus, targeting hardware implementation allows its use in embedded systems, expanding its application areas to real time systems and, in general, those applications where the use of desktop computers is not possible. Typically, RVFLN demands a wide number of resources and a high computational burden; high dimension matrices are involved, and computation intensive algorithms are required to obtain the output layer coefficient values for the neural network, especially matrix inversion. This work describes the algorithm implementation and optimization of these models to fit embedded hardware system requirements together with a parameterizable model, allowing different applications to benefit from it. The proposal includes the use of fuzzy activation functions in neurons to reduce computations. An exhaustive analysis of three proposed different computation architectures for the learning algorithm is done. Classification results for three standard datasets and fixed point arithmetic are compared to Matlab floating point results, together with hardware related analysis as speed of operation, bit-length accuracy in fixed point arithmetic and logic resource occupation. 相似文献
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为了提高油井作业中压力传感器的测量精度,提出了一种基于粒子群优化BP神经网络的误差补偿方法.利用粒子群算法的全局寻优和收敛速度快的特点,训练网络的权值,能有效地改善BP神经网络传统算法的收敛速度和学习能力.结果表明:这种方法大大提高了压力传感器在油井作业中的测量精度和稳定性,也提高了油田作业的工作效率. 相似文献
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近年来,由于深度卷积神经网络的出色性能,深度学习已成为图像超分辨率领域的研究热点,已经有许多具有很深结构的大型模型被提出。而在实际应用中,普通个人计算机或智能终端的硬件显然不适合大规模深度神经网络模型。提出了一种针对单幅图像超分辨率且具有自动残差缩放功能的轻量级网络(ARSN),与许多基于深度学习的方法相比,它的层和参数更少。此外,该网络中有特殊的残差块和跳跃连接用来进行残差缩放以及全局和局部残差学习。根据测试数据集结果,该网络在重建质量和运行速度上都达到了非常优异的性能。所提出的网络在性能、速度和硬件消耗方面均取得了良好的效果,具有较高的实用价值。 相似文献