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A Remark on the Courant-Friedrichs-Lewy Condition in Finite Difference Approach to PDE’s

Advances in Applied Mathematics and Mechanics 2014年第5期6卷 693-698页

作者： Kosuke Abe Nobuyuki Higashimori Masayoshi Kubo Hiroshi Fujiwara yuusuke iso Nihon University TokyoJapan Hitotsubashi University KunitachiJapan Graduate School of Informatics Kyoto UniversityKyotoJapan

The Courant-Friedrichs-Lewy condition(The CFL condition)is appeared in the analysis of the finite difference method applied to linear hyperbolic partial differential *** give a remark on the CFL condition from a view point of stability,and we give some numerical experiments which show instability of numerical solutions even under the CFL *** give a mathematical model for rounding errors in order to explain the instability。

关键词： Numerical analysis finite difference scheme stability CFL condition

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Numerical investigation on arching effect surrounding deep cylindrical shaft during excavation process

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Underground Space 2022年第5期7卷 944-965页

作者： Tanawat Tangjarusritaratorn yuusuke Miyazaki Yasuo Sawamura Kiyoshi Kishida Makoto Kimura Dept.of Urban Management Kyoto Univ.Katsura CampusKyoto 615-8540Japan Dept.of Civil and Earth Resources Engineering Kyoto Univ.Katsura CampusKyoto 615-8540Japan

Predicting the inner displacements of deep vertical shafts during the excavation process has been a difficult task considering the geological,structural,and constructional *** fact,the two-dimensional(2D)analytical solution based on the retaining wall model remains insufficient for understanding the actual behavior during an *** is because the deformation of vertical shafts becomes complicated due to the unexpected arching effect brought about by the three-dimensional(3D)flexible displacements occurring in the excavation *** analytical solutions only considered the limit ***,the present study deals with a 3D soil-structure simulation by considering the displacements of a cylindrical shaft and the mechanical behavior of the surrounding soil as well as the geometry of the cylindrical ***,this mechanical behaviors of the surrounding soil and shaft are controlled by the shaft stiffness;hence,the relationships among the shaft stiffness,mechanical behavior of the surrounding soil(in terms of earth pressure coefficient),and shaft displacement were investigated.A cylindrical model,120 m in depth and 20 m in diameter,was positioned at the center of a sand domain,and each excavation step was performed at an interval depth of 20 m.A 3D finite difference method analysis was applied using the modified Cam-Clay(MCC)model to represent the soil *** a result,the present study provides a new normalized lateral earth pressure theory for excavated shafts by considering the 3D arching effect obtained from parametric studies using various levels of shaft *** a comparison with the analytical solutions of previous studies(Terzaghi,1943a;Prater,1977;Cheng&Hu,2005),it is found that the previous studies underestimated the earth pressure acting on the cylindrical shaft because they did not consider the accurate arching effect.

关键词： Deep cylindrical shaft Excavation analysis Soil mixing wall method Arching effect Finite different method Three-dimensional analysis

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Reconsideration of So-Called “Invasive” Meningioma

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Open Journal of Modern Neurosurgery 2015年第4期5卷 118-123页

作者： Tomu Okada Kazuhiko Fujitsu Teruo Ichikawa Kousuke Miyahara Shin Tanino Uriu Yasuhiro yuusuke Tanaka yuusuke Tsuchiya Naoyuki Noda Hitoshi Niino Saburou Yagishita Department of Neurosurgery National Hospital Organization Yokohama Medical Center Yokohama Japan Department of Pathology National Hospital Organization Yokohama Medical Center Yokohama Japan

For the purpose of histopathological diagnosis, so-called “invasive meningioma” is defined as a meningioma that has infiltrated the cerebral parenchyma, and such cortical infiltration raises the risk of recurrence. However, as the definition of “invasive” remains far from clear, we have attempted to redefine it. Tumors that were completely removed from 32 patients between April 2005 and September 2015 and that had been diagnosed as so-called “invasive meningioma” were classified by World Health Organization grade (Group I–III), and then further classified as: true invasion, involving invasion of the brain with breakdown of the pia mater;and pseudo-invasion, involving encroachment into the brain with the pia mater still intact. We then investigated recurrence rates in the brain or dura mater for each group. Rate of recurrence in the brain or dura mater was significantly higher for Group I meningioma classified as true invasion compared to that of the same group classified as pseudo-invasion. We redefined so-called “invasive meningioma” as Group I meningioma exhibiting true invasion, and considered that, when possible, wide resection of the areas of adhesion to the dura mater in addition to tumor extirpation along with the cerebral parenchyma increased the success rate for curative treatment.

关键词： Invasive Meningioma True Invasion Pseudo-Invasion Surgical Margin Recurrence Rate

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The mechanism of axillary odor generation and its inhibition

The mechanism of axillary odor generation and its inhibition

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2006中国中西医结合皮肤性病学术会议

作者： Yutaka TAKAGI Shunichi AKIBA Hiroshi KUSUOKU yuusuke Shibuya Hiroshi NOJIRI Toyoki HAGURA Akira FUJI Masayuki YABUKI Yoshihiro HASEGAWA Kao Corporation Biological Science Laboratories Kao(China)Research & Development Centre Co． Ltd． Kao Corporation SKin Care Products Research Laboratories Kao Corporation Perfumery Development Research Laboratories

One of odor component in the human axillary region is 3 -methyl -2 -hexenoic acid(3M2H). It is reported that this component is secreted from the apocrine gland as bound form to apolipoprotein D( Apo D) as odorless component and that the odor arise when3M2H release from Apo D. In this report,we have clarified that proteinase of Brevibacterium,which is derived from human skin,degrade the Apo D and arise the axillary odor in apocrine sweat. And we found that Amur cork extract has high efficacy to inhibit the degrading of Apo D by Brevibacterium resulting in suppressing of the generation of axillary odor.

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