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475 results on '"Matsushita, Daisuke"'

5. Relationship between olfactory and gustatory functions: The Iwaki health promotion project 2019

Author

Yamauchi, Kazutaka, Matsushita, Daisuke, Shimizume, Nami, Kudo, Reiko, Kohama, Yusuke, Miyazaki, Akiko, Taguchi, Hiromu, Hirao, Takashi, Kawabata, Fuminori, Kawabata, Yuko, Sanematsu, Keisuke, Takai, Shingo, Yamazoe, Junichi, Anabuki, Kenichi, Aoshima, Ken, Takahashi, Yoshiko, Goto, Shinichi, Sasaki, Akira, Shigemura, Noriatsu, and Matsubara, Atsushi

Published
2024
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11. On subgroups of an automorphism group of an irreducible symplectic manifold

Author

Matsushita, Daisuke

Subjects
Mathematics - Algebraic Geometry
Abstract

Let X be an irreducible symplectic manifold and L a nef line bundle on X which is isotropic with respect to the Beauville-Bogomolov quadratic form. It is known that a subgroup Aut(X,L) of an automorphism group of X which fix L is almost abelian. We give a formula of the rank of Aut(X,L) in terms of MBM divisors. We also prove that the nef cone of X cut out MBM classes, which is a generalization of Kovac's structure theorem of nef cones of K3 surfaces, Comment: Correct typo and give a new proof of Lemma 5.1

Published
2018

21. On isotropic divisors on irreducible symplectic manifolds

Author

Matsushita, Daisuke

Subjects
Mathematics - Algebraic Geometry, 14D06
Abstract

Let X be an irreducible symplectic manifold and L a divisor on X. Assume that L is isotropic with respect to the Beauville-Bogomolov quadratic form. We define the rational Lagrangian locus and the movable locus on the universal deformation space of the pair (X, L). We prove that the rational Lagrangian locus is empty or coincide with the movable locus.

Published
2013

22. On almost holomorphic Lagrangian fibrations

Author

Matsushita, Daisuke

Subjects
Mathematics - Algebraic Geometry, 14D06, 14E05
Abstract

We prove that the pull back of an ample line bundle by an almost holomorphic Lagrangian fibration is nef. As an application, we show birational semi rigidity of Lagrangian fibrations.

Published
2012

23. Zariski F-decomposition and Lagrangian fibration on hyperk\'ahler manifolds

Author

Matsushita, Daisuke and Zhang, De-Qi

Subjects
Mathematics - Algebraic Geometry, Mathematics - Complex Variables, 14J40, 32Q15, 14E30, 53C26
Abstract

For a compact hyperk\"ahler manifold X, we show certain Zariski decomposition for every pseudo-effective R-divisor, and give a sufficient condition for X to be bimeromorphic to a (holomorphic) Lagrangian fibration. We also prove that any sequence of D-flops between projective hyperk\"ahler manifolds terminates after finite steps., Comment: Simplified the proof of Theorem 4.1. Final arXiv version

Published
2009

24. On deformations of Lagrangian fibrations

Author

Matsushita, Daisuke

Subjects
Mathematics - Algebraic Geometry, Mathematics - Differential Geometry, 14J40, 14D06
Abstract

Let X be an irreducible symplectic manifold and Def(X) the Kuranishi space. Assume that X admits a Lagrangian fibration. We prove that X can be deformed preserving a Lagrangian fibration. More precisely, there exists a smooth hypersurface H of Def(X) such that the restriction family over H admits a family of Lagrangian fibrations over H.

Published
2009

25. Comparison of the subtotal and narrow gastric conduit for cervical esophagogastrostomy after esophagectomy in esophageal cancer patients: a propensity score-matched analysis

Author

Sasaki, Ken, primary, Tsuruda, Yusuke, additional, Shimonosono, Masataka, additional, Noda, Masahiro, additional, Uchikado, Yasuto, additional, Omoto, Itaru, additional, Setoyama, Tetsuro, additional, Matsushita, Daisuke, additional, Arigami, Takaaki, additional, Baba, Kenji, additional, Kurahara, Hiroshi, additional, and Ohtsuka, Takao, additional

Published
2023
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26. A canonical bundle formular of projective Lagrangian fibrations

Author

Matsushita, Daisuke

Subjects
Mathematics - Algebraic Geometry, 14E40, 14D05
Abstract

We classify singular fibres of a projective Lagrangian fibration over codimension one points. As an application, we obtain a canonical bundle formula for a projective Lagrangian fibration over a smooth manifold., Comment: This paper has been withdrawn by the author due to a crucial gap of arguments of the proof

Published
2007

27. On nef reductions of projective irreducible symplectic manifolds

Author

Matsushita, Daisuke

Subjects
Mathematics - Algebraic Geometry, 14E30, 14J40
Abstract

Let X be a projective irreducible symplectic manifold and L a non trivial nef divisor on X. Assume that the nef dimension of L is strictly less than the dimension of X. We prove that L is semiample, Comment: 5 pages

Published
2006

28. Fujiki relation on symplectic varieties

Author

Matsushita, Daisuke

Subjects
Mathematics - Algebraic Geometry, Mathematics - Differential Geometry, 14F40, 14D06
Abstract

We generalize Fujiki relation of Beauville-Bogomolov quadratic form on a projective symplectic variety. As an application, we study a fibre space structure of a projective symplectic variety.

Published
2001

29. Higher direct images of Lagrangian fibrations

Author

Matsushita, Daisuke

Subjects
Mathematics - Algebraic Geometry
Abstract

We prove that the higher direct images of the dualizing sheaf of a Lagrangian fibration between smooth projective manifolds are isomorphic to the cotangent bundles of base space. As a corollary, we obtain that every Hodge number of the base space of a fibre space of an irreducible symplectic manifold is the same to that of a projective space if the base space is smooth., Comment: 26 pages

Published
2000

30. On singular fibres of complex Lagrangian fibrations

Author

Matsushita, Daisuke

Subjects
Mathematics - Algebraic Geometry, 14E35 (Primary) 14D05 (Secondary)
Abstract

We classify singular fibres over general points of the discriminant locus of projective complex Lagrangian fibrations on 4-dimensional holomorphic symplectic manifolds. The singular fibre F is the following either one: F is isomorphic to the product of an elliptic curve and a Kodaira singular fibre up to finite unramified covering or F is a normal crossing variety consisting of several copies of a minimal elliptic ruled surface of which the dual graph is Dynkin diagram of type A_n, $\tilde{A_n}$, $\tilde{D_n}$ or D_n., Comment: 13 pages 2 figures

Published
1999

31. Equidimensionality of complex Lagrangian fibrations

Author

Matsushita, Daisuke

Subjects
Mathematics - Algebraic Geometry, 14E35 (Promary) 14D05 (Secondary)
Abstract

We prove that every irreducible component of a fibre of a complex Lagrangian fibration is Lagrangian subvariety. Especially, complex Lagrangian fibations are equidimensional., Comment: 2 pages

Published
1999

33. On Deformations of Lagrangian Fibrations

Author

Matsushita, Daisuke, Bass, Hyman, Series editor, Lu, Jiang-Hua, Series editor, Oesterlé, Joseph, Series editor, Tschinkel, Yuri, Series editor, Chambert-Loir, Antoine, Series editor, Faber, Carel, editor, Farkas, Gavril, editor, and van der Geer, Gerard, editor

Published
2016
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38. On fibre space structures of a projective irreducible symplectic manifold

Author

Matsushita, Daisuke

Subjects
Mathematics - Algebraic Geometry, 14J35
Abstract

In this note, we investigate fibre space structures of a projective irreducible symplectic manifold. We prove that an 2n-dimensional projective irreducible symplectic manifold admits only an n-dimensional fibration over a Fano variety which has only Q-factorial log-terminal singularities and whose Picard number is one. Moreover we prove that a general fibre is an abelian variety up to finite unramified cover, especially, a general fibre is an abelian surface for 4-fold.

Published
1997

39. Improving locomotive syndrome risk level through community‐led activities to establish walking habits.

Author

Matsushita, Daisuke and Gu, Yangcheng

Subjects
SOCIAL participation, URBAN planning, PHYSICAL mobility, OLDER people, COMMUNITY involvement
Abstract

We evaluated the effects of walking habits and mobility improvement on an aging population among 30 residents of a suburban residential complex with the aim of promoting sustainable health activities led by residents. The results showed a total of 911 person‐days of actual walking (Mean = 30.4, Standard Deviation = 15.7) with an average of 30 days per person or a frequency of almost daily intervals over 2 months. In total, 68.4% of early‐ and 54.5% of late‐elderly participants met the recommended criteria for healthy older adults. The results of the GLFS‐25 and 2‐step tests showed a significant improvement in the mobility function after the walking period compared to before the walking period. In addition to the improvements in physical mobility, there were improvements in social interactions and participation in community activities. The participants' post‐walking effect showed that 85% of them were in good health, 50% had positive social interactions, and 25% had positive statements regarding community and town planning. The results verified that resident‐led sustainable walking activities can establish walking habits and improve mobility. [ABSTRACT FROM AUTHOR]

Published
2024
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49. Clinical and oncological outcomes of transanal total mesorectal excision considering the embryology along the fascia in rectal cancer patients: a propensity score-matched analysis

Author

Yoshimitsu, Kohei, primary, Mori, Shinichiro, additional, Tanabe, Kan, additional, Wada, Masumi, additional, Hokonohara, Kentaro, additional, Hamada, Yuki, additional, Yasudome, Ryutaro, additional, Kurahara, Hiroshi, additional, Arigami, Takaaki, additional, Sasaki, Ken, additional, Matsushita, Daisuke, additional, Shimonosono, Masaki, additional, Koriyama, Chihaya, additional, Higashi, Michiyo, additional, Nakajo, Akihiro, additional, and Ohtsuka, Takao, additional

Published
2022
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50. Quadruple purse-string suture for single stapling technique following transanal total mesorectal excision for rectal cancer

Author

Mori, Shinichiro, primary, Tanabe, Kan, additional, Wada, Masumi, additional, Kita, Yoshiaki, additional, Hokonohara, Kentaro, additional, Yasudome, Ryutaro, additional, Satake, Soichi, additional, Hamada, Yuki, additional, Arigami, Takaaki, additional, Matsushita, Daisuke, additional, Shimonosono, Masataka, additional, Sasaki, Ken, additional, Kurahara, Hiroshi, additional, Nakajo, Akihiro, additional, and Ohtsuka, Takao, additional

Published
2022
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