Postdoctoral Scientific Research Workstation

Beijing, China

Postdoctoral Scientific Research Workstation

Beijing, China
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Guo Y.,Dalian University of Technology | Guo Y.,Postdoctoral Scientific Research Workstation | He R.,CAS Institute of Automation | Zheng W.-S.,Sun Yat Sen University | And 2 more authors.
Neurocomputing | Year: 2013

Spectral regression has been an efficient and powerful tool for face recognition. However, spectral regression is sensitive to the errors incurred by inaccurate annotation and occlusion. This paper studies robust spectral regression based discriminant subspace learning from correntropy and spatially smooth structure of facial subspace. First, we formulate the robust discriminant subspace learning problem as a maximum correntropy problem, which finds the most correlation solution between spectral targets and predictions. Second, total variation (TV) regularization is imposed on the correntropy objective to learn a spatially smooth face structure. Lastly, based on the additive form of half-quadratic optimization, we cast the maximum correntropy problem into a compound regularization model, which can be efficiently optimized via an accelerated proximal gradient algorithm. Compared with iteratively reweighted least squares based methods, the proposed method can not only improve recognition rates but also reduce computational cost. Experimental results on a couple of face recognition datasets demonstrate the robustness and effectiveness of our method against inaccurate annotation and occlusion. © 2013 Elsevier B.V.

Li X.M.,PLA | Wang N.,PLA | Wang N.,Postdoctoral Scientific Research Workstation | Shi W.K.,PLA
Applied Mechanics and Materials | Year: 2014

In order to realize the zero-range-target simulation, the echo delay simulation method for the fixed radar and simulator is given. By this method, zero-range target simulation can be realized. Finally, it is verified by a computation example. © (2014) Trans Tech Publications, Switzerland.

Zeng L.,Dalian University of Technology | Kong X.,Dalian University of Technology | Li M.,Dalian University of Technology | Guo Y.,Dalian University of Technology | Guo Y.,Postdoctoral Scientific Research Workstation
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2015

The cover source mismatch is a common problem in steganalysis, which may result in the degradation of detection accuracy. In this paper, we present a novel method to mitigate the problem of JPEG quantization table mismatch, named as Robust Discriminative Feature Transformation (RDFT). RDFT transforms original features to new feature representations based on a non-linear transformation matrix. It can improve the statistical consistency of the training samples and testing samples and learn new matched feature representations from original features by minimizing feature distribution difference while preserving the classification ability of training data. The comparison to prior arts reveals that the detection accuracy of the proposed RDFT algorithm can significantly outperform traditional steganalyzers under mismatched conditions and it is close to that of matched scenario. RDFT has several appealing advantages: 1) it can improve the statistical consistency of the training and testing data; 2) it can reduce the distribution difference between the training features and testing features; 3) it can preserve the classification ability of the training data; 4) it is robust to parameters and can achieve a good performance under a wide range of parameter values. © 2015 SPIE.

Lu Z.,Postdoctoral Scientific Research Workstation
ICIC Express Letters, Part B: Applications | Year: 2016

The designers in recon_gurable computing _elds always require considerable knowledge in both software and hardware to build hybrid applications. The main chal- lenges and barriers that hamper the wide adoption of recon_gurable computing systems are the lack of high-level design and development tools. This paper presents a compila- tion framework for IR2HDL mapping for Field Programmable Gate Arrays. The modulo scheduling schemes with a constant initiation interval in most compilers schedule the iterations and generate pipelines by using a pipeline division method. In order to reduce the pipeline depth and increase throughput, a parallel loop scheduling scheme and im- proved modulo scheduling method are presented. The test case on selected kernels shows the method improves the delay stage and the scheme shows signi_cant performance im- provement. © 2016 ICIC International.

Zhao Q.,University of Sichuan | Wang G.,University of Sichuan | Yan K.,University of Sichuan | Yan J.,Postdoctoral Scientific Research Workstation | Wang J.,Postdoctoral Scientific Research Workstation
Journal of Applied Polymer Science | Year: 2015

Conducting polymers are attractive for potential applications in flexible electronic industries because of their unique advantages. To simplify the process of electrode preparation, porous poly(3,4-ethylenedioxythiophene) (PEDOT) film electrodes without binder and conductive additive were synthesized facilely for flexible supercapacitors via an in situ solution micro polymerization at the surface of a soft etched tunnel aluminum (ETA) template at room temperature. The template was directly used as the current collector of electrodes. The morphologies of the samples and the template were compared using scanning electron microscopy (SEM), and the polymer molecular structure and composition were analyzed with Fourier-transform infrared (FTIR) spectroscopy. Symmetric supercapacitors were assembled with the PEDOT electrodes, Celgard 2300 separator, and 1.0 M LiPF6/EC+DMC+EMC (1: 1: 1 in volume) electrolyte. The electrochemical performance was evaluated using different techniques like galvanostatic charging/discharging tests, cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS). The results from different current densities and scanning rates show the supercapacitors have good rate performance. The specific capacitance, energy density, and coulombic efficiency of the PEDOT supercapacitor can reach 69.0 F g-1 (or 103.0 F m-2), 24.0 Wh kg-1, and ∼95% at a current density of 0.2 A g-1, respectively. Furthermore, the PEDOT electrodes exhibit relatively good cycle performance, and the capacitance retention ratio is ∼72% after 1500 cycles. The electrode process was discussed. The results are comparable to that of the reported PEDOT, which indicates the applicability of the novel simple method of solution microreaction at the surface of a soft metal template to directly prepare binder-free flexible electrodes. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42549. © 2015 Wiley Periodicals, Inc.

Wang X.-L.,China University of Petroleum - Beijing | Wang X.-L.,Postdoctoral Scientific Research Workstation | Shuai J.,China University of Petroleum - Beijing
Gongcheng Lixue/Engineering Mechanics | Year: 2011

River-crossing pipeline is threatened by flood which could induce the pipeline being eroded and exposed, moreover, floating in a large scale. Under the combined effects of dynamic water, buoyancy, gravity and resistance of bank soil, pipeline generally presents three-dimensional bending. A mechanical analysis model is built to investigate the mechanical behaviour of pipeline exposed in flood. Taking into account the nonlinear pipe-soil interaction, the axial force and material nonlinearity of pipeline steel, the dimensional bending curve and a deformation compatibility equation of pipeline are derived. And pipeline stress and strain are calculated with an iterative solving method. Based on the proposed analytical methodology, a computer program is developed and the pipeline deformation, stress and strain are analyzed through a series of examples. Each example is subsequently investigated with the finite element method and the calculation results of the proposed method are close to that of the finite element method. Finally, a safety assessment method for pipeline in flood is proposed according to limit state theory, by which the safety of a pipeline exposed in mountain torrent is assessed.

Lu Z.,Postdoctoral Scientific Research Workstation
ICIC Express Letters | Year: 2016

Convolutional networks are computational models that are widely used in pattern recognition applications. Operations in these applications require convolution filtering at each pixel. Depending on the size of input image and convolution kernel, the two-dimensional convolution can require significant amounts of computation, thus suggesting a highly parallel implementation in hardware. This paper describes a loopbased computation and storage partition scheme for convolution filtering on Field Programmable Gate Arrays (FPGAs), which can guide the proper parameterization of a convolution filter bank on a given architecture. The case study on selected kernels shows the method can express the computation and storage tradeoffs involved in mapping a Convolutional Neural Networks (CNNs) on FPGAs. © 2016, ICIC Express Letters Office. All rights reserved.

Zhang C.-H.,LIAONING Technical University | Zhang C.-H.,Postdoctoral Scientific Research Workstation | Liu Z.-G.,Anhui University of Science and Technology | Liu J.,Anhui University of Science and Technology | And 2 more authors.
Zhongguo Kuangye Daxue Xuebao/Journal of China University of Mining and Technology | Year: 2013

Physical scale modeling was used to investigate the distribution and characteristics of gas pressure and stress ahead of the crosscut uncovering the closed type tectonic fracture zone. Modelling results show that the initial stress of the closed tectonic fracture zone surrounding rock is about 1.5~1.7 times of that of the normal zone because of the tectonic structure stress. As the crosscut roadway advances, the surrounding rock stress of the closed tectonic fracture zone increases more than 2 times of that of the normal zone; prior to the exposure of the closed tectonic damage zone, the surrounding rock maintains a higher stress and gas pressure, which forms abnormal high stress and gas pressure gradient between the crosscut working face and the tectonic zone, and thus provides favorable conditions for the occurrence of coal and gas outburst.

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