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作者： Atupelage, Chamidu Nagahashi, Hiroshi Yamaguchi, Masahiro Abe, Tokiya Hashiguchi, Akinori Sakamoto, Michiie Department of Computational Intelligence and Systems Science Tokyo Institute of Technology Yokohama-shi 226-8503 Japan Imaging Science and Engineering Laboratory Tokyo Institute of Technology Yokohama-shi 226-8503 Japan Global Scientific Information and Computing Center Tokyo Institute of Technology Tokyo 152-8550 Japan Department of Pathology School of Medicine Keio University Tokyo 160-8582 Japan

Histopathology is a microscopic anatomical study of body tissues and widely used as a cancer diagnosing method. Generally, pathologists examine the structural deviation of cellular and sub-cellular components to diagnose the malignancy of body tissues. These judgments may often subjective to pathologists' skills and personal experiences. However, computational diagnosis tools may circumvent these limitations and improve the reliability of the diagnosis decisions. This paper proposes a prostate image classification method by extracting textural behavior using multifractal analysis. Fractal geometry is used to describe the complexity of self-similar structures as a non-integer exponent called fractal dimension. Natural complex structures (or images) are not self-similar, thus a single exponent (the fractal dimension) may not be adequate to describe the complexity of such structures. Multifractal analysis technique has been introduced to describe the complexity as a spectrum of fractal dimensions. Based on multifractal computation of digital imaging, we obtain two textural feature descriptors;i) local irregularity: α and ii) global regularity: f (α). We exploit these multifractal feature descriptors with a texton dictionary based classification model to discriminate cancer/non-cancer tissues of histopathology images of H&E stained prostate biopsy specimens. Moreover, we examine other three feature descriptors;Gabor filter bank, LM filter bank and Haralick features to benchmark the performance of the proposed method. Experiment results indicated that the performance of the proposed multifractal feature descriptor outperforms the other feature descriptors by achieving over 94% of correct classification accuracy. Copyright © 2012 The institute of Electronics, Information and Communication Engineers.

关键词： Fractal dimension

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MULTI-PUNCTURE INITIAL DATA IN NUMERICAL RELATIVITY

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International Journal of Modern Physics: Conference Series 2012年第7期ijmpcs卷 247-258页

作者： CHUN-YU LIN ZHOUJIAN CAO HWEI-JANG YO Department of Physics National Cheng Kung University Tainan 70101 Taiwan Institute of Applied Mathematics Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing 100190 China State Key Laboratory of Scientific and Engineering Computing China

We present a spectral multi-puncture initial data solver based on the LORENE library http://***/ . The solver generates multi black holes initial data with arbitrary linear momentum and spin within a moderate computational resource. The local convergence test shows that the solution rapidly converged to a high precision.

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Stability of glued and embedded Glass Panes: Dunkerley straight Line as a conservative Estimate of superimposed buckling Coefficients

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IFAC Proceedings Volumes 2012年第2期45卷 124-129页

作者： Anton Arnold Lukas Neumann Werner Hochhauser Institute for Analysis and Scientific Computing Vienna University of Technology A-1040 Wien Austria Institute for Mathematics Innsbruck University A-6020 Innsbruck Austria Institute of Architectural Sciences Department of Structural Design and Timber Engineering Vienna University of Technology A-1040 Wien Austria

Abstract We consider a rectangular glass pane as part of a stiffening and force-transmitting timber-glass composite building element. The glass pane is assumed to be both glued circumferentially and embedded into a timber substructure via block setting which enables a load transfer of horizontal forces via vitreous shear areas and compression diagonals within the glass. To verify the stability of the glass pane, the buckling coefficient has to be determined. In this note we first present a PDE model (based on linear elasticity) for the stress tensor within the glass pane and the eigenvalue problem for buckling of the pane. These two equations (in weak formulation) are then solved subsequently with the software COMSOL, i.e. the computed stress field is an input coefficient for the eigenvalue problem of the plate equation. We are interested in the critical load that implies buckling. It is determined by zero becoming an eigenvalue of the plate equation. Numerical results are presented for pane geometries between 1:1 and 4:1. We also find that an additional transversal surface pressure does not influence the critical buckling loads (at linear order). The maximum load is a non-linear function of the compression and shear forces applied at the boundary of the pane. To provide a simplified analysis for the practitioner, we prove that the Dunkerley straight line represents a conservative estimate for superimposed buckling coefficients and therefore for the critical buckling load. This mathematically rigorous proof is based on an application of the generalized Dunkerley theorem for eigenvalue problems.

关键词： plate buckling stability analysis von Kármán plate equations eigenvalue problem FEM simulation Dunkerley straight line

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Exponential synchronization of stochastic complex networks with time-varying delays by adaptive control

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International Journal of Advancements in computing Technology 2012年第20期4卷 239-249页

作者： Wu, XueFei Xu, Chen Feng, Jianwen Zhao, Yi School of Computer Engineering Shenzhen Polytechnic China College of Information Engineering Shenzhen University China Chen Xu Institute of Intelligent Computing Science Shenzhen University China College of Mathematics and Computational Sciences Shenzhen University China

This paper studies the exponential synchronization of stochastic complex networks with switching topology and time-varying delays by using the adaptive control method. Based on stability theory of switching systems, the synchronization of the complex network, which is subject to vector-form stochastic perturbations, switching topology and different internal and outer time-varying delays, is investigated. Moreover, a kind of adaptive controller is designed. Sufficient conditions for exponential synchronization are obtained by using the Lyapunov-Krasovskii functional and the linear matrix inequality (LMI). Numerical examples are given to demonstrate the validity of the theoretical results.

关键词： Linear matrix inequalities

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Numerical simulation of three-dimensional hypervelocity impact using smoothed particle hydrodynamics

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Binggong Xuebao/Acta Armamentarii 2012年第SUPPL.1期33卷 290-295页

作者： Jia, Bin Ma, Zhi-Tao Pang, Bao-Jun Zhang, Wei Department of Astronautics Engineering Harbin Institute of Technology Harbin 150080 Heilongjiang China Institute of Computational Mathematics and Scientific/Engineering Computing Chinese Academy of Sciences Beijing 100190 China

The searching of neighbor particles is the key to the computational efficiency of smoothed particle hydrodynamics (SPH). An algorithm of multi-level dynamic grid-linked list search was presented. All the background grids are squares or cubes with the side length of one level of grids being whole number times of the lower level. Only limited amount of memory was consumed to store dynamically the virtual coordinates of background grids and particles. The number of grid levels and the multiple of different levels of grid sizes can be selected optimization ally according to the particle number. The optimized values of grid parameters were obtained through verification of searching efficiency. The optimized results show that the searching efficiency is dominated directly by the number of grid levels and influenced by the multiple of different levels of grid sizes to a certain extent. The searching algorithm was validated by the simulation of two oblique hypervelocity impact examples.

关键词： computational efficiency

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Boundary absorbing computations in wave simulation with the finite element method

Boundary absorbing computations in wave simulation with the ...

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2011 2nd International Conference on Mechanic Automation and Control engineering, MACE 2011

作者： Zhang, Wensheng Institute of Computational Mathematics and Scientific/Engineering Computing LSEC Academy of Mathematics and Systems Beijing China

ISBN: (纸本)9781424494392

The simulation of wave propagation has important applications in many problems such as in computational seismology. Here, we focus on boundary absorbing computations in wave simulation with the finite element method on triangular mesh. The first-order and second-order absorbing boundary conditions based on wave decomposition are presented. Moreover, the absorbing conditions for corners are proposed. The weak formulations combined with absorbing conditions are derived. Numerical computations for a complex model show that boundary reflections are eliminated and the computational efficiency is high by using the mass-lumping technique. © 2011 IEEE.

关键词： Finite element method

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Velocity spectrum analysis in seismic prospecting combining detection principles, beamspace techniques and coherent signal-subspace processing

Velocity spectrum analysis in seismic prospecting combining ...

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Asilomar Conference on Signals, Systems & Computers

作者： Rafael Krummenauer Amauri Lopes Martin Tygel School of Electrical and Computer Engineering (FEEC) University of Campinas Campinas Sao Paulo Brazil Institute of Mathematics Statistics and Scientific Computing (IMECC) University of Campinas Campinas Sao Paulo Brazil

ISBN: (纸本)9781467350501

We revisit the conventional velocity analysis in seismic data processing with the purpose of enhancing the temporal resolution and the sensitivity of the coherency measure in the velocity spectrum. To that end, we exploit the fact that seismic signals are coherent, wideband and tend to be sparse in the time domain. To compose an appropriate methodology, given these data features, we employ some well-established techniques of array signal processing: coherent signal-subspace approach, beamspace processing and detection theory. The proposed methodology was tested for a real 2D offshore data and has shown success for the outlined purposes.

关键词： combining outlined purposes velocity spectrum Outlines seismic exploration velocity analysis TIME-DOMAIN

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Waveform inversion of crosshole data based on acoustic wave equation

Waveform inversion of crosshole data based on acoustic wave ...

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2011 2nd International Conference on Mechanic Automation and Control engineering, MACE 2011

作者： Zhang, Wensheng Luo, Jia Institute of Computational Mathematics and Scientific/Engineering Computing LSEC Academy of Mathematics and Systems Science Beijing China

ISBN: (纸本)9781424494392

Waveform inversion of crosshole data based on acoustic wave equation is investigated in this paper. The inversion is set as an optimization problem with the Lagrange multiplier function. The Tikhonov regularization is adopted in objective function. The gradient of the objective function is generated by solving the adjoint equation of the forward problem with the finite difference method. In order to prevent the quasi-Newton method to trap in local optimal value, a suitable initial model is required. For comparison, the traveltime inversion or tomography is implemented which provide smooth features of the velocity model. Numerical computations are given which show the good ability of the new velocity inversion method. © 2011 IEEE.

关键词： Lagrange multipliers

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Multifractal feature descriptor for grading Hepatocellular carcinoma

Multifractal feature descriptor for grading Hepatocellular c...

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International Conference on Pattern Recognition

作者： C. Atupelage H. Nagahashi M. Yamaguchi T. Abe A. Hashiguchi M. Sakamoto Department of Computational Intelligence and Systems Science Tokyo Institute of Technology Japan Imaging Science and Engineering Laboratory Tokyo Institute of Technology Japan Global Scientific Information and Computing Center Tokyo Institute of Technology Japan Department of Pathology School of Medicine Keio University Japan

This paper presents a textural feature descriptor that can be effectively utilized for grading Hepatocellular carcinoma (HCC) histopathological images. The proposed feature descriptor observes the local and spatial characteristics of the texture by utilizing multifractal computation, and it is incorporated with a bag-of-feature (BOF)-based classification model to classify a set of images. We compare the proposed feature descriptor with four well-founded feature descriptors in the experiments, and benchmark the classification performances. The benchmarked results indicated the significance of the multifractal feature descriptor.

关键词： Fractals Tumors Biopsy Extraterrestrial measurements computational modeling Atmospheric measurements Particle measurements

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A Conservative Modification to the Ghost Fluid Method for Compressible Multiphase Flows

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Communications in computational Physics 2011年第9期10卷 785-806页

作者： Wei Liu Li Yuan Chi-Wang Shu Institute of Computational Mathematics and Scientific/Engineering Computing Academy of Mathematics and Systems ScienceChinese Academy of SciencesBeijing 100190China Division of Applied Mathematics Brown UniversityProvidence RI 02912USA.

A conservative modification to the ghost fluid method(GFM)is developed for compressible multiphase *** motivation is to eliminate or reduce the conservation error of the GFM without affecting its *** track the conservative variables near the material interface and use this information to modify the numerical solution for an interfacing cell when the interface has passed the *** modification procedure can be used on the GFM with any base *** this paper we use the fifth order finite difference WENO scheme for the spatial discretization and the third order TVD Runge-Kutta method for the time *** level set method is used to capture the *** experiments show that the method is at least mass and momentum conservative and is in general comparable in numerical resolution with the original GFM.

关键词： WENO scheme ghost fluid method(GFM) mass conservation multiphase flow

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