Fast and Orthogonal Locality Preserving Projections for Dimensionality Reduction.

The locality preserving projections (LPP) algorithm is a recently developed linear dimensionality reduction algorithm that has been frequently used in face recognition and other applications. However, the projection matrix in LPP is not orthogonal, thus creating difficulties for both reconstruction and other applications. As the orthogonality property is desirable, orthogonal LPP (OLPP) has been proposed so that an orthogonal projection matrix can be obtained based on a step by step procedure; however, this makes the algorithm computationally more expensive. Therefore, in this paper, we propose a fast and orthogonal version of LPP, called FOLPP, which simultaneously minimizes the locality and maximizes the globality under the orthogonal constraint. As a result, the computation burden of the proposed algorithm can be effectively alleviated compared with the OLPP algorithm. Experimental results on two face recognition data sets and two hyperspectral data sets are presented to demonstrate the effectiveness of the proposed algorithm.

Effects of Psoralen on Alcohol-induced Proliferation of Osteoblasts / 广州中医药大学学报

Objective To observe the effect of psoralen on the proliferation of osteoblasts induced by alcohol, thus to explore the mechanism of psoralen in preventing and treating alcohol-induced osteoporosis. Methods The osteoblasts separated from neonatal rat skull were identified by alkaline phosphatase (ALP) staining method. The in-vitro confirmed osteoblasts were randomly divided into 4 groups, namely blank control group, alcohol group (model group), psoralen group, and psoralen plus alcohol group. The alcohol-induced osteoblast proliferation in various groups was determined by methyl thiazolyl tetrazolium (MTT) method. Results Compared with the blank control group, the alcohol-induced osteoblast proliferation at culturing hour 24, 48, 72, 96 in alcoholgroup was significantly decreased (P0.05). Compared with the alcohol group, osteoblast proliferation at culturing hour 24 in psoralen plus alcohol group was significantly increased (P 0.05). Conclusion Psoralen has certain effect on promoting alcohol-induced osteoblast proliferation in vitro.

Comparison of three oral regimens with compound polyethylene glycol electrolyte for bowel prepara-tion / 中华消化内镜杂志

were no significant differences in the detection rate of recto-sigmoid colon,mid colon,right colon and total detection of polyps among the 3 groups (P >0.05).Conclusion 4-L split-dose PEG is better than the oth-er 2 regimens in the colon cleansing quality,so it can better reach the intestinal cleaning standards before enteroscopy,which is a more suitable regimen for bowel preparation.