Nonlinear Hydroelastic Waves Generated Due to a Floating Elastic Plate in a Current
Effects of underlying uniform current on the nonlinear hydroelastic waves generated due to an infinite floating plate are studied analytically, under the hypotheses that the fluid …
Adaptive Tight Frame Based Multiplicative Noise Removal
Sparse approximation has shown to be a significant tool in improving image restoration quality, assuming that the targeted images can be approximately sparse under some transform …
Weifeng Zhou
一种基于小波分析的数字图像水印技术研究
随着网络、个人存储设备的发展,数字图像的传播也越来越便捷。但是,恶意篡改、盗用数字图像的现象也日益严重,所以保护数字图像的版权是亟待解决的问题。提出一种基于小波分析的数字水印方法,利用小波域内的JND(最小视觉误差)模型,对载体图像的小波系数进行修改,完成水印嵌入,进而达到保护数字图像版权的目的。实验结果表明,水印的不可感知性很好,在抵抗平滑、中值滤波、椒盐 …
Jiadong Liang
面向节能的单/多列车优化决策问题
主要研究了单/多列车运行优化控制问题.首先建立了面向节能的单列车能耗优化模型,采用节能控制策略对模型进行求解,得出节能运行的速度距离曲线;其次对多列车多区段的节能运行进行优化控制设计,以再生能量利用最大化为目标,分别建立多列车能耗优化通用模型和高峰/非高峰情形下优化模型,利用模拟退火算法求解模型,得出使总能耗最低的列车运行方案;最后针对晚点情况下追踪运行的多 …
Jiadong Liang
基于分形和HVS的小波域数字图像水印算法
针对数字图像版权的保护,本文提出了一种基于分形的小波域数字图像水印算法。首先将载体图像进行Haar小波变换,将小波系数树分为同方向小波树,并在同方向小波树中构造域子树和值子树,通过分形匹配将域子树分为嵌入域子树和非嵌入域子树,然后在嵌入域子树中加入水印。在水印嵌入时,只嵌入部分水印信息来减少水印的嵌入量,同时运用人类视觉系统HVS模型控制水印嵌入的强度,保证 …
Bo Zhang
Northern-Hemisphere Snow Cover Patterns and Formation Conditions in Winter 2007 and 2012
The Arctic sea ice minimum records appeared in the Septembers of 2007 and 2012, followed by high snow cover areas in the Northern Hemisphere winters. The snow cover distributions …
