Evaluation on Surface Current Observing Network of High Frequency Ground Wave Radars in the Gulf of Thailand
The performance of the surface current observing network of high frequency ground wave radars (HFGWRs) in the Gulf of Thailand (GoT) is evaluated. Based on the Dilution of …
Dynamic Event-Triggered Adaptive Tracking Control for Stochastic Nonlinear Systems with Deferred Time-Varying Constraints
This article investigates the problem of adaptive tracking control for stochastic nonlinear systems with deferred state constraints. The novel unified universal barrier function …
Dongmei Wang
Impact of High-Frequency Observations on Fog Forecasting: A Case Study of OSSE
Abstract Fog that refers to the concentration of ice or water droplets in the near surface air is an important short-time meteorological phenomenon. As the measure of visibility of …
Huiqin Hu
基于改进的JND模型的视频水印算法
针对视频版权的保护,提出了一种基于改进的JND模型的视频水印算法。此算法首先选取二值图像作为图像水印,利用Logistic混沌映射对图像进行加密;然后对载体视频进行关键帧提取,将提取的帧进行4层小波分解,结合分形理论对小波系数进行D树和R树的存储,并根据人类视觉系统(HVS)提出改进的JND模型,进而将处理后的水印信息按照三个方向自适应的嵌入到D树和R树中。 …
