In this paper, an adaptive neural output feedback control scheme based on backstepping technique and dynamic surface control (DSC) approach is developed to solve the tracking …
In this paper, an observer-based adaptive neural tracking control approach is proposed for a class of stochastic nonlinear systems with immeasurable states. The radial basis …
针对运动目标检测中ViBe算法的鬼影、阴影和噪声干扰问题,本研究提出一种融入改进混合高斯模型(GMM)的ViBe算法。该算法改进混合高斯模型的自适应性,使混合高斯模型的K值与学习率对背景进行自适应调节;对视频帧进行训练,构造\"虚拟\"背景代替第一帧图像进行背景建模,算法能够有效地提取背景建模初始化的视频运动目标,从而消除鬼影现象。该算法用像素分类法提取前景 …
运用超效率数据包络分析法(SE-DEA)模型和固定效应回归模型探究中国\"十二五\"期间环境规制效率的时空差异和驱动机制。结果表明:(1)\"十二五\"时期,中国的环境规制综合效率平均值在0.86～1.16范围内波动,产生波动的原因主要是投入的环境保护资源被利用的程度不同。(2)\"十二五\"时期,中国环境规制综合效率、纯技术效率和规模效率均呈现东部地区 …
针对视频中运动目标的提取问题,提出一种基于形态学的高斯模型和八邻域帧差法相融合的提取算法。该算法首先将视频中某些帧转化为灰度图,建立以混合高斯分布为基础的统计模型,并结合八邻域帧差法提取出运动目标的大致轮廓,然后利用自适应更新的高斯模型算法进行精确的减除,最后再进行形态学处理,从而使检测出的运动目标更加清晰完整。实验结果表明,该算法对含有低速运动物体、阴影较 …
Highlights•We propose a new sea surface temperature inversion model.•The model is based on deep neural network.•This model is more accurate than traditional method.•The model is …
The compressive sampling matching pursuit (CoSaMP) algorithm is widely used in orthogonal frequency division multiplexing (OFDM) underwater acoustic (UWA) sparse channel estimation …
This study revisits the Arctic sea ice extent (SIE) for the extended period of 1979–2015 based on satellite measurements and finds that the Arctic SIE experienced three different …
Based on tropical cyclone (TC) track data and gridded observational rainfall data of CN05.1 during the period of 1961 to 2014, we examine the contribution of TCs on three metrics …