Besides the rating information, an increasing number of modern recommender systems also allow users to add personalized tags items. Such tagging information may provide very useful for item recommendation, because users' interests in items can be implicitly reflected by that they often use. Although some content-based have made preliminary attempts recently utilize improve recommendation performance, few based on collaborative filtering (CF) employed help procedure. In this paper, we propose...

Multi-frame track-before-detect (MF-TBD) is a model-based batch processing method. Assuming particular model for the evolution of target states (e.g. constant velocity model) within time, MF-TBD integrates energy by taking advantage space-time correlations between number consecutive frames. Its performance known to be heavily dependent on accuracy motion model, and substantially degrade when maneuvers occur motions do not follow presumed model. We make two contributions towards addressing...

This article considers the detection and tracking of weak targets in multiple pulse repetition frequency (multi-PRF) radars using track-before-detect (TBD) technique. By exploring measurement independence among different PRFs, we decompose joint multi-PRF multiframe optimization problem into several lower dimensional maximizations, each which corresponds to an intra-PRF processing. An efficient two-stage TBD procedure with a parallel structure is proposed for radars. Specifically, first...

In this article, we develop a multiframe detection architecture relying on the generalized likelihood ratio test (GLRT) to address complicated multitarget and tracking in radar systems. The commonly used unrealistic assumptions made previous works, where targets are sufficiently far apart from each other do not occupy same measurement cell (only for high-resolution radars), can be relaxed. Specifically, at design stage, take full account of energy integration real over measurements accurate...

Self-healing coatings, which autonomically repair and prevent corrosion of the underlying substrate, are particular interest for researchers. In article, effectiveness epoxy resin filled microcapsules was investigated healing cracks generated in coatings. Microcapsules were prepared by situ polymerization urea–formaldehyde to form shell over resindroplets. Characteristics these capsules studied scanning electron microscope (SEM), thermo gravimetric analyzer (TGA) particle size analyzer. The...

The multi-frame detection (MFD) with range-Doppler-azimuth measurements has been shown to be significant in detecting and tracking weak targets active radar sonar systems. Existing methods suffer from integrated energy loss for a long time noncoherent observation sequences due approximate target evolution model or rough integration strategies. Moreover, it is hard maintain consistency of different near-field far-field regions. By carefully mapping echo discrete grid space without the...

AIM: To investigate the relationship between autophagy and apoptosis in photoinduced injuries retinal pigment epithelium (RPE) cells how Lycium barbarum polysaccharide (LBP) contributes to increased of RPE autophagy. METHODS: In vitro cultures human strains (ARPE-19) were prepared randomly divided into blank control, model, low-dose LBP, middle-dose high-dose 3-methyladenine (3MA) groups. The viability levels each group tested through cell counting kit-8 (CCK8) method with a flow cytometer...

A diode-end-pumped continuous wave (cw) single-longitudinal-mode Nd:GdVO(4) laser at 1342 nm is reported. ring resonator was designed and the mode-to-pump ratio optimized to achieve higher output power. maximum power of 3.1 W cw obtained, measured stability better than ±1% in given 2 h. The experimental results are good agreement with theoretical calculation considering energy-transfer upconversion.

This study aimed to evaluate the safety and efficacy of rivaroxaban in preventing portal vein system thrombosis (PVST) patients with liver cirrhosis after splenectomy pericardial devascularization. 70 cirrhotic undergoing devascularization were randomly assigned treatment (n=35) or low-molecular weight heparin (LMWH) plus warfarin for 30 days this randomized controlled trial. The primary endpoint is PVST formation. Ultrasound doctors radiologists blinded randomization results. Both groups...

In this paper, we discuss the problem of minimizing sum two convex functions: a smooth function plus non-smooth function. Further, part can be expressed by average large number component functions, and is equipped with simple proximal mapping. We propose stochastic second-order method, which efficient scalable. It incorporates Hessian in exploits multistage scheme to reduce variance gradient. prove that our method achieve linear rate convergence.

To reveal the relationship between grain size and twinning deformation of magnesium alloys under cyclic strain, this study carried out a group strain-controlled low-cycle fatigue experiments statistical analysis microstructures. Experimental results show that shape hysteresis loop exhibits significant asymmetry at different strain amplitudes, accumulation residual twins plays an important role in subsequent deformation. For distribution alloy approximately follows Weibull probability...

Existing dynamic programming based track-before-detect (DP-TBD) strategies suffer from merit function expansion phenomenon (MFEP), which aggravated the burden of designing detection threshold. The traditional constant false alarm rate (CFAR) is ineffective because noise energy can not be exactly estimated area expansion. threshold setting existing DP-TBD usually resort to Monte-Carlo counting, extreme-value theory or its generalized version. For nonhomogeneous clutter background and...

It is widely verified that the multi-frame track-before-detect (MF-TBD) effective for detection and tracking of weak targets. This paper considers extension MF-TBD to moving surveillance platform, specifically, airborne radar system. For static radars, needs first map received raw data an absolute coordinate, mostly WGS-84 then perform integration between accumulate target energy along physically feasible states. The time-varying space biased complex coordinate system conversion, caused by...

This paper mainly addresses the dim target detection and tracking problems in multiple pulse repetition frequency (MPRF) radar system using multi-frame track-before-detect (MF-TBD) method. Generally, each measurement frame received by MPRF faces range Doppler ambiguities at specific (PRF) setting. We have proposed a multi-PRF TBD (MPMF-TBD) algorithm [1], which provides an energy-efficient solution to accomplish kinematic state estimation ambiguity resolution simultaneously. However, this...

In this paper, we address the problem of detection and tracking dim targets in radar systems through use multi-frame (MFD) techniques. We first study energy expansion during integration for classical MFD methods, which shows that extended peak envelope poses a great challenge target nonhomogeneous backgrounds multi-target cases. Next, greedy based algorithm is proposed, separates overall joint maximization into two processes confidence building suppression. The proposed can eliminate...

To quantitatively detect aqueous levels of angiopoietin-like (ANGPTL)3, ANGPTL4, and ANGPTL6 investigate their correlation with optical coherence tomography angiography (OCTA) findings in patients diabetic macular edema (DME).This cross-sectional study included 23 (27 eyes) type 2 diabetes 16 control subjects (20 eyes). All underwent OCTA imaging ultra-wide field fundus photography. Diabetic were categorized into two groups according to the presence or absence retinopathy (DME group, 14...

Asynchronous federated learning (AFL) is an effective method to address the challenge of device heterogeneity in cross-device learning. However, AFL usually incompatible with existing secure aggregation protocols used protect user privacy because most are based on synchronous aggregation. To this problem, we propose a novel protocol named buffered asynchronous (BASA) paper. Compared protocols, BASA fully compatible and provides under condition that each only needs one round communication...

Distributed learning is indispensable for training large-scale deep models. Asynchronous SGD~(ASGD) and its variants are commonly used distributed methods in many scenarios where the computing capabilities of workers cluster heterogeneous. Momentum has been acknowledged benefits both optimization generalization model training. However, existing works have found that naively incorporating momentum into ASGD can impede convergence. In this paper, we propose a novel method, called ordered...