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Micromagnetic simulation of FeCo write head in perpendicular recording hard disk drives

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Rare Metals 2006年第Z1期25卷 502-508页

作者： QUAN Liang wei dan Lab of Advanced Materials Department of Materials Science and Engineering Tsinghua University Beijing 100084 China Lab of Advanced Materials Department of Materials Science and Engineering Tsinghua University Beijing 100084 China

The single-pole tip (SPT) heads made of the high saturation FeCo ferromagnetic metals are crucial for the actualization of ultrahigh density perpendicular recording. The effective head field distribution in the medium is of key importance for the design of the SPT head, which would be analyzed by micromagnetic simulations in this work. Two 3D micromagnetic models of the SPT head were established to select a more appropriate method of modeling, with a magnetostatic image effect or a real soft magnetic material to model the image of the SPT head in soft under layer (SUL). The results from these two designs were tested and compared to the ideal head field calculated by the Jacobi finite element method (FEM); and the design with the real soft magnetic material as image was proved suitable for simulating the ultrahigh density perpendicular recording write head.

关键词： SPT head perpendicular recording micromagnetic simulation image

Analysis of orthogonal multi-matching pursuit under restricted isometry property

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Science China Mathematics 2014年第10期57卷 2179-2188页

作者： dan wei School of Mathematics and Statistics Guangdong University of Finance & Economics

Orthogonal multi-matching pursuit（OMMP）is a natural extension of orthogonal matching pursuit（OMP）in the sense that N（N≥1）indices are selected per iteration instead of *** this paper,the theoretical performance of OMMP under the restricted isometry property（RIP）is *** demonstrate that OMMP can exactly recover any K-sparse signal from fewer observations y=φx,provided that the sampling matrixφsatisfiesδKN-N＋1＋√K/NθKN-N＋1,N〈***,the performance of OMMP for support recovery from noisy observations is also *** is shown that,for l_2 bounded and l_∞bounded noisy cases,OMMP can recover the true support of any K-sparse signal under conditions on the restricted isometry property of the sampling matrixφand the minimum magnitude of the nonzero components of the signal.

关键词： sparse recovery orthogonal matching pursuit restricted isometry property

Robustness of orthogonal matching pursuit under restricted isometry property

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Science China Mathematics 2014年第3期57卷 627-634页

作者： dan wei WANG RenHong School of Mathematics and Computational Sciences Guangdong University of Business Studies School of Mathematical Sciences Dalian University of Technology

Orthogonal matching pursuit （OMP） algorithm is an efficient method for the recovery of a sparse signal in compressed sensing, due to its ease implementation and low complexity. In this paper, the robustness of the OMP algorithm under the restricted isometry property （RIP） is presented. It is shown that 5K＋V/KOK,1 〈 1 is sufficient for the OMP algorithm to recover exactly the support of arbitrary /（-sparse signal if its nonzero components are large enough for both 12 bounded and lz~ bounded noises.

关键词： compressed sensing orthogonal matching pursuit restricted isometry property

ZnO-MWCNTs/Nafion inorganic-organic composite film:Preparation and application in bioelectrochemistry of hemoglobin

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Chinese Chemical Letters 2009年第3期20卷 358-361页

作者： wei Ma wei Song dan Bi Tian College of Science Nanjing University of Technology Nanjing 210009 China

Multi-walled carbon nanotubes （MWCNTs） were coated with ZnO by a hydrothermal method. The resulting nanocomposites were mixed with the Nation solution to form a composite matrix for the fabrication of hemoglobin （Hb） biosensor. To prevent the leak of Hb molecules of the biosensor, silica sol-gel film was coated on the surface of the Hb/ZnO-MWCNTs/Nafion electrode. The silica sol-gel/Hb/ZnO-MWCNTs/Nafion film exhibited a pair of well-defined, quasi-reversible redox peaks. This biosensor showed excellent electrocataiytic activity to H2O2. The sensitivity and apparent Michaelis-Menten constant of this Hb biosensor to H2O2 were 1.31 A/（M cm^2） and 82.8 μmol/L, respectively, which indicated that Hb had high affinity to H2O2.

关键词： Hemoglobin ZnO Multi-walled carbon nanotubes Nation Bioelectrochemistry

A tracking and predicting scheme for ping pong robot

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Journal of Zhejiang University-Science C(Computers and Electronics) 2011年第2期12卷 110-115页

作者： Yuan-hui ZHANG wei wei dan YU Cong-wei ZHONG School of Electrical Engineering Zhejiang University Hangzhou 310027 China

We describe a new tracking and predicting scheme applied to a lab-made ping pong robot. The robot has a monocular vision system comprised of a camera and a light. We propose an optimized strategy to calibrate the light center using the least square method. An ellipse fitting method is used to precisely locate the center of ball and shadow on the captured image. After the triangulation of the ball position in the world coordinates, a tracking algorithm based on a Kalman filter outputs an accurate estimation of the flight states including the ball position and velocity. Furthermore, a neural network model is constructed and trained to predict the following flight path. Experimental results show that this scheme can achieve a good predicting precision and success rate of striking an incoming ball. The robot can achieve a success rate of about 80% to return a flight ball of 5 m/s to the opposite court.

关键词： Ping pong robot Calibration Trajectory tracking Kalman filter Neural network

Periodic Boundary Conditions for Finite-Differentiation-Method Fast-Fourier-Transform Micromagnetics

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Chinese Physics Letters 2017年第4期34卷 97-100页

作者： Jiang-Nan Li dan wei Key Laboratory of Advanced Materials(MOE) School of Materials Science and EngineeringTsinghua UniversityBeijing 100084

We describe an accurate periodic boundary condition （PBC） called the symmetric PBC in the calculation of the magnetostatie interaction field in the finite-differentiation-method fast-Fourier-transform （FDM-FFT） micromagneties. The micromagnetic cells in the regular mesh used by the FDM-FFT method are finite-sized elements, but not geometrical points. Therefore, the key PBC operations for FDM-FFT methods are splitting and relocating the micromagnetic cell surfaces to stay symmetrically inside the box of half-total sizes with respect to the origin. The properties of the demagnetizing matrix of the split micromagnetic cells are discussed, and the sum rules of demagnetizing matrix are fulfilled by the symmetric PBC.

关键词： PBC FDM Periodic Boundary Conditions for Finite-Differentiation-Method Fast-Fourier-Transform Micromagnetics FFT

Comparative Analysis of Regulatory Motif Discovery Tools for Transcription Factor Binding Sites

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Genomics, Proteomics & Bioinformatics 2007年第2期5卷 131-142页

作者： wei wei Xiao-dan Yu Department of Pathobiology Center of Computational Biology Institute of Basic Medical Sciences Beijing100850 China

In the post-genomic era, identification of specific regulatory motifs or transcription factor binding sites （TFBSs） in non-coding DNA sequences, which is essential to elucidate transcriptional regulatory networks, has emerged as an obstacle that frustrates many researchers. Consequently, numerous motif discovery tools and correlated databases have been applied to solving this problem. However, these existing methods, based on different computational algorithms, show diverse motif prediction efficiency in non-coding DNA sequences. Therefore, understanding the similarities and differences of computational algorithms and enriching the motif discovery literatures are important for users to choose the most appropriate one among the online available tools. Moreover, there still lacks credible criterion to assess motif discovery tools and instructions for researchers to choose the best according to their own projects. Thus integration of the related resources might be a good approach to improve accuracy of the application. Recent studies integrate regulatory motif discovery tools with experimental methods to offer a complementary approach for researchers, and also provide a much-needed model for current researches on transcriptional regulatory networks. Here we present a comparative analysis of regulatory motif discovery tools for TFBSs.

关键词： motif TFBS non-coding DNA sequence computational algorithm motif discovery tool

MACAO＇S LEGAL SYSTEM UNDER GLOBALIZATION AND REGIONAL INTEGRATION： BETWEEN TRADITION AND EVOLUTION

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Frontiers of Law in China-Selected Publications from Chinese Universities 2014年第2期9卷 233-251页

作者： wei dan Associate Professor and Director at Institute for Advanced Legal Studies Faculty of Law of University of Macao Macao China

Macao, a former Portuguese colony and now one of only two Special Administrative Regions of the People＇s Republic of China, is undergoing unprecedented socio-economic growth and transformation. Using Macao as an empirical case, the paper examines the challenges of regional integration and globalization on legal theories, identifies how law interacts with other socio-cultural factors, and analyzes the self-reflection and self-adjustments of a legal culture in dynamic and diverse dimensions of time and space. The paper aims to find an innovative approach to discover the progressive pattern of inertia, evolution, survival, diffusion and interaction of a legal tradition in a global context.

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Micromagnetic studies of perpendicular recording FePt media with controllable grain size distributions

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Rare Metals 2006年第Z1期25卷 436-439页

作者： DONG Zhong PIAO Kun SHE Shengxian wei dan LI Zhenghua wei Fulin Department of Materials Science and Engineering Tsinghua UniversityBeijing 100084China Research Institute of Magnetic Materials Lanzhou UniversityLanzhou 730000China

A 3-dimensional(3D)micromagnetic model combined with Fast Fourier Transform(FFT)method was built up to study the writability in the L1_(0)FePt perpendicular *** effects of controllable grain size distributions were studied by grain growth *** is found that the cross-track-averaged magnetization changes little between the L1_(0)FePt medium with uniform or non-uniform grain size distribution.

关键词： perpendicular recording L1_(0)FePt medium controllable grain size distributions micromagnetic simulation