Coupled Cross-correlation Neural Network Algorithm for Principal Singular Triplet Extraction of a Cross-covariance Matrix

This paper proposes a novel coupled neural network learning algorithm to extract the principal singular triplet (PST) of a cross-correlation matrix between two high-dimensional data streams. We firstly introduce a novel information criterion (NIC), in which the stationary points are singular triplet of the crosscorrelation matrix. Then, based on Newton's method, we obtain a coupled system of ordinary differential equations (ODEs) from the NIC. The ODEs have the same equilibria as the gradient of NIC, however, only the first PST of the system is stable (which is also the desired solution), and all others are (unstable) saddle points. Based on the system, we finally obtain a fast and stable algorithm for PST extraction. The proposed algorithm can solve the speed-stability problem that plagues most noncoupled learning rules. Moreover, the proposed algorithm can also be used to extract multiple PSTs effectively by using sequential method. © 2014 Chinese Association of Automation.

Lichtenstein inguinal hernia repairs with porcine small intestine submucosa: a 5- year follow-up. a prospective randomized controlled study

Porcine small intestine submucosa(SIS)biologic patch has been used in inguinal hernia repair.However,there are lttle data available to assess the long-term effect after repair.This study aimed to explore the long-term effect of SIS patch in open inguinal hernia repair.Sevent-six patients with unilateral inguinal hernia were treated with Lichtenstein tension-free hernia repair using SIS patch(Beijing Datsing Bio-Tech Co,Ltd.)and Surgisis patch(COOK,USA)in Tianjn Union Medical Center and China-Japan Friendship Hospital.In the trial,the long-term efficacy of the treatment group and the control group were compared.A total of 66 patients in both groups received long-term follow-up(>5years)after surgery,with a followup rate of 86.8%.During the follow-up period,there was one case of recurrence,one case of chronic pain in the control group.There was no statistically significant difference(P>0.05)in terms of recurrence,chronic pain,foreign body sensation and infection between the two groups of patients.After long-term observations,it has been found that the porcine small intestinal submucosa(SIS)biological patch is safe and effective for inguinal hernia Lichtenstein repair,and has a low recurrence rate and complication rate.

Modeling and simulation methods of sea clutter based on measured data

The modeling and simulation of sea clutter are important in detecting radar targets in sea backgrounds.Because the nonstationary property of sea clutter is ignored in traditional statistical models,a new method based on measured sea clutter is proposed in this paper.First,we convert the measured sea clutter data under different sea conditions[xI,xQ]into real amplitude SM.Instantaneous phaseθis then extracted from the coherent radar’s baseband data.Second,we select a candidate statistic model and estimate its parameters based on SM by utilizing maximum likelihood estimation.Finally,we generate random series A using corresponding random data generator and then add instantaneous phaseθinto A,i.e.,y=Ae^(jθ),to obtain simulated sea clutter series.Through a comparison of simulated sea clutter and measured sea clutter data via histogram,the validity of the proposed method is proved.