Gui-Pi-Wan extract acts as a radioprotective agent

The radioprotective effects of 6 Gui-Pi-Wan extracts were investigated by examining cell viability and 30-d survival of mice after total-body ⁶⁰Co irradiation. Pretreatment with Gui-Pi-Wan precipitate by water extraction and alcohol precipitation (PWA) prior to irradiation resulted in significantly higher cell survival and lower apoptosis rates at 24 h after 5 Gy radiation, and increased 30-d survival in mice after exposure to a potentially lethal dose of 8 Gy. These results collectively indicate that PWA of Gui-Pi-Wan extracts is an effective radioprotective agent.     

一种用于图像检索的幂归一化深度卷积特征加权聚合方法

针对图像检索中基于部位的加权聚合(PWA)方法存在的视觉突发问题,提出一种幂归一化的深度卷积特征加权聚合方法。首先简化了原PWA方法中用于确定空间权重的归一化和幂变换操作,直接将所选择的有区分性的通道特征图作为空间权重矩阵,然后引入新的幂变换函数并选取合适的参数对加权聚合后的通道响应进行归一化处理,最后通过PCA降维和白化处理形成图像的全局特征表示形式。在4个标准数据库上的图像检索实验结果表明,该方法能有效调节PWA聚合特征响应的突发度并提高图像检索的准确率。     

基于PWA模型的混杂系统优化控制

针对混杂系统非线性和非一致连续的复杂特性,使用混杂系统描述语言(HYSDEL)建立能以任意的精确程度描述非线性系统特性的分段仿射(Piece Wise Affine ,PWA)模型并采用模型预测控制对系统进行优化.通过对具体实例的仿真研究,结果表明优化控制方法是有效的.