基于special Cosserat板理论的超大型海洋浮体的非线性水弹性响应
研究了漂浮在流体表面的超大型浮体的非线性水弹性响应。基于special Cosserat板理论将浮体简化为弹性Plotnikov and Toland板,在势流理论的框架下控制方程和反映水动力、惯性力和弹性力耦合作用的边界条件。运用同伦分析方法分析了一些重要参数对板的水弹性相应的影响,并比较了将浮体简化为非线性板和简化为线性板的差别。结果发现在较小板挠度情形 …
Adaptive Neural Output Feedback Tracking Control for a Class of Nonlinear Systems
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 …
Adaptive Neural Output Feedback Tracking Control for a Class of Nonlinear Systems
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 …
Observer-Based Adaptive Neural Tracking Control for a Class of Stochastic Nonlinear Systems
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 …
A Fast Low-Rank Matrix Factorization Method for Dynamic Magnetic Resonance Imaging Restoration
Nowadays, over 90 percent of the medical data comes from the medical image. People can reduce the medical faults in diagnoses by using computer to analyze and process these medical …
Fei Xu
一种基于改进混合高斯模型的运动目标检测算法
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 …
中国“十二五”期间环境规制效率时空差异与驱动机制研究
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 …
Ming Chang
基于形态学的高斯模型和八邻域帧差法混合运动目标检测算法
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 …
Sparsity Adaptive CoSaMP Based on Dynamic Threshold and Weak Atom Selection for Underwater Acoustic Sparse Channel Estimation
The compressive sampling matching pursuit (CoSaMP) algorithm is widely used in orthogonal frequency division multiplexing (OFDM) underwater acoustic (UWA) sparse channel estimation …
The Phase Differences of the Interdecadal Variabilities of Tropical Cyclone Activity in the Peak and Late Seasons over the Western North Pacific
This study compares the interdecadal variations in tropical cyclone (TC) activities over the western North Pacific (WNP) basin during the peak season (July–September) and late …
