人脸识别是模式识别中的重要研究领域之一。受到the Variation Energy Image(VEI)成功的启发,我们将VEI方法应用于对人脸特征进行有效的提取。使用此方法就可以从训练样本中找到一幅特征图。而且这个特征就是差别最大的特征。于是,根据...人脸识别是模式识别中的重要研究领域之一。受到the Variation Energy Image(VEI)成功的启发,我们将VEI方法应用于对人脸特征进行有效的提取。使用此方法就可以从训练样本中找到一幅特征图。而且这个特征就是差别最大的特征。于是,根据这个特征图,我们去除掉特征图中相对应的像素。使得原来的训练样本,变得更加接近自己类的特征。待测试样本,在进行比较时,也去掉特征图的像素。最后使用Linear Discriminant Analysis(LDA)方法得到特征子空间,测试样本投影到特征子空间上的一个最近的L2范数距离,作为分类的标准。提出的方法与传统的LDA方法进行比较,得到了较好的实验效果。展开更多
Liver resection(LR) with negative margins confers survival advantage in many patients with hepatic malignancies.However,an adequate future liver remnant(FLR) is imperative for safe LR.Presently,in patients with an ina...Liver resection(LR) with negative margins confers survival advantage in many patients with hepatic malignancies.However,an adequate future liver remnant(FLR) is imperative for safe LR.Presently,in patients with an inadequate FLR; the 2 most established clinical techniques performed to induce liver hypertrophy are portal vein embolization(PVE) and portal vein ligation.More recently,it has been observed that patients who undergo treatment via Y90 radioembolization experience hypertrophy of the contra-lateral untreated liver lobe.Based on these observations,several investigators have proposed the potential use of this modality as an alternative technique for increasing the FLR prior to liver resection.Y90 radioembolization induces hypertrophy at a slower rate than PVE but has the added advantage of concomitant local disease control and tumour downstaging.展开更多
文摘Liver resection(LR) with negative margins confers survival advantage in many patients with hepatic malignancies.However,an adequate future liver remnant(FLR) is imperative for safe LR.Presently,in patients with an inadequate FLR; the 2 most established clinical techniques performed to induce liver hypertrophy are portal vein embolization(PVE) and portal vein ligation.More recently,it has been observed that patients who undergo treatment via Y90 radioembolization experience hypertrophy of the contra-lateral untreated liver lobe.Based on these observations,several investigators have proposed the potential use of this modality as an alternative technique for increasing the FLR prior to liver resection.Y90 radioembolization induces hypertrophy at a slower rate than PVE but has the added advantage of concomitant local disease control and tumour downstaging.
