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Semi-Rigid Registration of 3D Points

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Journal of Signal and Information Processing 2013年第3期4卷 25-29页

作者： Baowei Lin Kouhei Sakai Toru Tamaki Bisser Raytchev kazufumi kaneda Koji Ichii Graduate School of Engineering Hiroshima University Higashi-Hiroshima Japan.

In this paper, we proposed a method for semi-rigid changed 3D point clouds registration. We first segment the point clouds into individual segments and then the alignment energy costs of each segment are calculated. The rough initial transformation is estimated by minimizing the energy cost using integer programming. The final registration results are obtained by rigid alignments of separated corresponded segments. Experimental result with simulated point clouds demonstrate that the concept of semi-rigid registration works well.

关键词： Semi-Rigid Registration Segmentation Integer Programming Rigid Alignment Energy Minimization

Multi-parameter Tikhonov Regularization—An Augmented Approach

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Chinese Annals of Mathematics,Series B 2014年第3期35卷 383-398页

作者： kazufumi ITO Bangti JIN Tomoya TAKEUCHI Center for Research in Scientific Computation & Department of Mathematics North Carolina State University Department of Mathematics University of California Riverside 900 University Ave.Riverside CA92521 USA. Collaborative Research Center for Innovative Mathematical Modelling Institute of Industrial ScienceThe University of Tokyo 4-6-1-Cw601 Komaba Meguro-ku Tokyo 153-8505 Japan.

We study multi-parameter regularization(multiple penalties) for solving linear inverse problems to promote simultaneously distinct features of the sought-for objects. We revisit a balancing principle for choosing regularization parameters from the viewpoint of augmented Tikhonov regularization, and derive a new parameter choice strategy called the balanced discrepancy principle. A priori and a posteriori error estimates are provided to theoretically justify the principles, and numerical algorithms for efficiently implementing the principles are also provided. Numerical results on deblurring are presented to illustrate the feasibility of the balanced discrepancy principle.

关键词： Multi-parameter regularization Augmented Tikhonov regularization Balanced discrepancy principle

Immersed Interface CIP for One Dimensional Hyperbolic Equations

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Communications in Computational Physics 2014年第6期16卷 96-114页

作者： kazufumi Ito Tomoya Takeuchi Department of Mathematics North Carolina State UniversityRaleighNC 27695USA. Collaborative Research Center for Innovative Mathematical Modelling Institute of Industrial ScienceUniversity of TokyoTokyoJapan. FIRST Aihara Innovative Mathematical Modelling ProjectJSTKawaguchiJapan.

The immersed interface technique is incorporated into CIP method to solve one-dimensional hyperbolic equations with piecewise constant *** proposed method achieves the third order of accuracy in time and space in the vicinity of the interface where the coefficients have jump discontinuities,which is the same order of accuracy of the standard CIP *** numerical tests are given to verify the accuracy of the proposed method.

关键词： CIP method immersed interface method hyperbolic equations in discontinuous media.

The Sensitivity Analysis for the Flow Past Obstacles Problem with Respect to the Reynolds Number

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Advances in Applied Mathematics and Mechanics 2012年第1期4卷 21-35页

作者： kazufumi Ito Zhilin Li Zhonghua Qiao Center for Research in Scientific Computation&Department of Mathematics North Carolina State UniversityRaleighNC 27695-8205USA School of Mathematical Sciences Nanjing Normal UniversityNo.1 Wenyuan RoadYadong New DistrictNanjing 210046China Department of Mathematics Hong Kong Baptist UniversityKowloon TongHong Kong

In this paper,numerical sensitivity analysis with respect to the Reynolds number for the flow past obstacle problem is *** carry out such analysis,at each time step,we need to solve the incompressible Navier-Stokes equations on irregular domains twice,one for the primary variables;the other is for the sensitivity variables with homogeneous boundary *** Navier-Stokes solver is the augmented immersed interface method for Navier-Stokes equations on irregular *** of the most important contribution of this paper is that our analysis can predict the critical Reynolds number at which the vortex shading begins to develop in the wake of the *** interesting experiments are shown to illustrate how the critical Reynolds number varies with different geometric settings.

关键词： Navier-Stokes equations sensitivity analysis flow past cylinder embedding technique immersed interface method irregular domain augmented system projection method fluid-solid interaction

Study on analysis of crystal structure in CeO_2 doped with Er_2O_3 or Gd_2O_3

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Journal of Rare Earths 2010年第S1期28卷 164-167页

作者： Yuki Tahara kazufumi Yasunaga Toshiyuki Matsui Fuminobu Hori Akihiro Iwase Department of Materials Science Osaka Prefecture University1-1Gakuen-choNaka-kuSakaiOsaka599-8531Japan Department of Applied Quantum Physics and Nuclear Engineering Kyushu University744MotookaNishikuFukuoka 819-0395Japan

To simulate the effects of burnable poison doping in nuclear fuel UO2,Er2O3(or Gd2O3)-doped CeO2 pellets were prepared. Changes in lattice constant and atomic disordering for CeO2 due to the Er2O3 and Gd2O3 doping were measured by means of XRD and XAFS. By the Er2O3 doping,the lattice constant decreased,and a disordering of lattice structure was induced in the samples. The doping with Er2O3 also induced the disordering of atomic arrangement around Er atoms,which was observed through the change in XAFS spectra. In contrast,the effect of Gd2O3 doping was smaller than that of Er2O3 doping. The result was discussed in terms of ionic size of dopants in CeO2 crystal.

关键词： CeO2 ceramic pellets Er2O3 and Gd2O3 doping Change in lattice structure XRD XAFS rare earths

The genome-wide meiotic recombination landscape in ciliates and its implications for crossover regulation and genome evolution

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Journal of Genetics and Genomics 2024年第3期51卷 302-312页

作者： Lu Fu Chen Gu kazufumi Mochizuki Jie Xiong Wei Miao Guangying Wang Key Laboratory of Aquatic Biodiversity and Conservation Institute of HydrobiologyChinese Academy of SciencesWuhanHubei 430072China University of Chinese Academy of Sciences Beijing 100049China Institute of Human Genetics(IGH) CNRSUniversity of Montpellier34396 MontpellierFrance Key Laboratory of Breeding Biotechnology and Sustainable Aquaculture Chinese Academy of SciencesWuhanHubei 430072China Key Laboratory of Lake and Watershed Science for Water Security Chinese Academy of SciencesNanjingJiangsu 210008China

Meiotic recombination is essential for sexual reproduction and its regulation has been extensively studied in many ***,genome-wide recombination landscape has not been reported in ciliates and it remains unknown how it is affected by the unique features of ciliates:the synaptonemal complex(SC)-independent meiosis and the nuclear ***,we show the recombination landscape in the model ciliate Tetrahymena thermophila by analyzing single-nucleotide polymorphism datasets from 38 hybrid *** detect 1021 crossover(CO)events(35.8 per meiosis),corresponding to an overall CO rate of 9.9 cM/***,gene conversion by non-crossover is rare(1.03 per meiosis)and not biased towards G or C *** with the reported roles of SC in CO interference,we find no obvious sign of CO *** tends to occur within germ-soma common genomic regions and many of the 44 identified CO hotspots localize at the centromeric or subtelomeric *** ontology analyses show that CO hotspots are strongly associated with genes responding to environmental *** discuss these results with respect to how nuclear dimorphism has potentially driven the formation of the observed recombination landscape to facilitate environmental adaptation and the sharing of machinery among meiotic and somatic recombination.

关键词： Meiotic recombination Hotspot Crossover interference Adaptive evolution

Wetting of Au and Ag particles on monocrystalline graphite substrates

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Rare Metals 2006年第5期25卷 469-472页

作者： Joonho Lee Toshihiro Tanaka kazufumi Seo Nobumitsu Hirai Jung-Goo Lee Hirotaro Mori Department of Materials Science & Engineering Korea University5-1 Anam-dongSeongbuk-kuSeoul 136-713Republic of Korea Div.of Materials and Manufacturing Science Osaka University2-1 YamadaokaSuitaOsaka 565-0871Japan Research Center for Ultra High Voltage Electron Microscopy Osaka University7-1 MihogaokaIbarakiOsaka 567-0047Japan

The wetting behavior of Au and Ag particles on a monocrystalline graphite substrate was investigated using the microscopic sessile drop method under a purified Ar atmosphere at 1300 K. The measured contact angles of the liquid Au and Ag on monocrystalline graphite substrates of （0001） face were 129° and 124°, respectively. It is believed that the interaction at the interface is dominated by the physical bonding （van der Waal＇s interaction）.

关键词： graphite microscopic sessile drop method surface structure wetting

An Augmented Approach for the Pressure Boundary Condition in a Stokes Flow

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Communications in Computational Physics 2006年第5期1卷 874-885页

作者： Zhilin Li Xiaohai Wan kazufumi Ito Sharon R.Lubkin Center for Research in Scientific Computation&Department of Mathematics North Carolina State UniversityRaleighNC 27695-8205USA Biomathematics Graduate Program&Department of Mathematics North Carolina State UniversityRaleighNC 27695-8203USA

An augmented method is proposed for solving stationary incompressible Stokes equations with a Dirichlet boundary condition along parts of the *** this approach,the normal derivative of the pressure along the parts of the boundary is introduced as an additional variable and it is solved by the GMRES iterative *** dimension of the augmented variable in discretization is the number of grid points along the boundary which is O(N).Each GMRES iteration(or one matrix-vector multiplication)requires three fast Poisson solvers for the pressure and the *** our numerical experiments,only a few iterations are *** have also combined the augmented approach for Stokes equations involving interfaces,discontinuities,and singularities.

关键词： Incompressible Stokes equations pressure boundary condition augmented method interface problem immersed interface method fast Poisson solver GMRES method

Decreasing trend in prostate cancer with high serum prostate-specific antigen levels detected at first prostate-specific antigen-based population screening in Japan

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Asian Journal of Andrology 2014年第6期16卷 833-837页

作者： Yasuhide Kitagawa Kazuaki Machioka Hiroshi Yaegashi kazufumi Nakashima Mitsuo Ofud Kouji Izumi Satoru Ueno Yoshifumi Kadono Hiroyuki Konaka Atsushi Mizokami Mikio Namiki Department of Integrative Cancer Therapy and Urology Kanazawa University Graduate School of Medical Science Kanazawa 920-8640 Japan

To clarify the recent trends in prostate-specific antigen （PSA） distribution in men in Japan, we analyzed the PSA distributions of men undergoing PSA-based population screening. We summarized the annual individual data of PSA-based population screening in Kanazawa, Japan, from 2000 to 2011, and analyzed baseline serum PSA values of the participants at the first population screening. Serum PSA distributions were estimated in all participants and those excluding prostate cancer patients according to age. From 2000 to 2011, 19 620 men participated aged 54-69 years old in this screening program. Mean baseline serum PSA level of all participants at the first screening was 2.64 ng m1-1 in 2000, and gradually decreased to approximately 1.30 ng ml-I in 2006. That of participants excluding prostate cancer patients was 1.46 ng m1-1 in 2000, and there was no remarkable change during the study period. The 95t＂ percentiles in the participants excluding prostate cancer patients detected at the first population screening of men aged 54-59, 60-64, and 65-69 years old were 2.90, 3.60, and 4.50 ng m1-1, respectively. After the commencement of population screening, the proportion of prostate cancer patients with high serum PSA levels decreased. However, there were no changes in serum PSA levels in men without prostate cancer. Age-specific PSA reference level of men without prostate cancer in Japan was similar to that in China and Korea.

关键词： age-specific prostate-specific antigen reference range prostate cancer prostate-specific antigen-based population screening serum prostate-specific antigen distribution