UMEHARA Masaaki

J-GLOBAL         Last updated: Dec 28, 2018 at 21:00
 
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Name
UMEHARA Masaaki
Affiliation
Tokyo Institute of Technology
Section
School of Computing
Job title
Professor
Degree
Ph. D(University of Tsukuba)
Research funding number
90193945

Research Interests

 
 

Research Areas

 
 

Education

 
 
 - 
1984
Faculty of Engineering, Keio University
 

Published Papers

 
Surfaces with light-like points in Lorentz-Minkowski 3-space with applications
Masaaki Umehara and Kotaro Yamada
Lorentzian Geometry and Related Topics, Springer Proceedings of Mathematics and Statics   211 253-273   Apr 2018   [Refereed]
Surfaces with light-like points in Lorentz-Minkowski 3-space with applications
M. Umehara and K. Yamada
Lorentzian Geometry and Related Topics, (eds. M.A. Canadas-Pineto et al.)      2017   [Refereed]
Quadrics and Scherk towers
S. Fujimori, U. Hertrich-Jeromin, M. Kokubu and M. Umehara and K. Yamada
Monatsh Math.   186 249-279   2017   [Refereed]
Analytic extension of Jorge-Meeks type maximal surfaces in Lorentz-Minkowski 3-space
S. Fujimori, Y. Kawakami, M. Kokubu, W. Rossman, M. Umehara, K.Yamada
Osaka J. Math.   54 249-272   2017   [Refereed]
Mixed type surfaces with bounded mean curvature in 3-dimensional space-times
A. Honda, M. Koiso, M. Kokubu, M. Umehara and Kotaro Yamada
Diff. Geom. and its Appl.   52 64-77   2017   [Refereed]
C^1-umbilics with arbitrarily high indices
N. Ando, T. Fujiyama and M. Umehara
Pasific Journal of Mathematics   288    2017   [Refereed]
An index formula for a bundle homomorphism of the tangent bundle into a vector bundle of the same rank, and its applications
K. Saji, M. Umehara and K. Yamada
J. Math. Soc. Japan   69 417-457   2017   [Refereed]
Zero mean curvature entire graphs of mixed type in Lorentz-Minkowski 3-space
S. Fujimori, Y. Kawakami, M. Kokubu, W. Rossman, M. Umehara, K. Yamada
Q. J. Math.   67 801-837   Nov 2016   [Refereed]
Behavior ofm Gaussan curvature and mean curvature near non-degenerate singular points on wave fronts
UMEHARA Masaaki
Geometry and Topology of manifolds, he proceedings of China-Japan Geometry Conference. Springer Proc. Math. Stat.   154 241-281   2016   [Refereed]
Isometric deformations of cuspidal edges
K. Naokawa, M. Umehara, and K. Yamada
Tohoku Math. J.   68 73-90   2016   [Refereed]
Zero mean curvature surfaces in Lorentz-Minkowski Tex-space which change type across a light-like line
S. Fujimori, Y. W. Kim, S.-E. Koh, W. Rossman, H. Shin, M. Umehara, K. Yamada and S.-D. Yang
Osaka J. Math.   52 285-297   Jan 2015   [Refereed]
Intrinsic properties of singularities of surfaces
M. Hasegawa, A. Honda, K. Naokawa, K. Saji, M. Umehara, and K. Yamada
International Journal of Math.   26    2015   [Refereed]
Zero mean curvature surfaces in Lorentz-Minkowski 3-space and 2-dimensional fluid mechanics
S. Fujimori, Y. W. Kim, S.-E. Koh, W. Rossman, H. Shin, M. Umehara, K. Yamada and S.-D. Yang
Math. J. Okayama Univ.   57 173-200   2015   [Refereed]
Caustics of convex curves
H. Gounai and M. Umehara
Journal of Knot Theory and Its Ramifications   23    Sep 2014   [Refereed]
Intrinsic invariants of cross caps
M. Hasegawa, A. Honda, K. Naowaka, M. Umehara and K. Yamada
Selecta Math. New Ser.   20 769-785   Jul 2014   [Refereed]
Embedded triply periodic zero mean curvature surfaces of mixed type in Lorentz-Minkowski 3-space
S. Fujimori, W. Rossman, M. Umehara, K. Yamada and S.-D. Yang
Michigan Math. J.   63 189-207   Mar 2014   [Refereed]
Flat surfaces in hyperbolic 3-space whose hyperbolic Gauss maps are bounded
S. Fujimori, W. Rossman, M. Umehara, K. Yamada and S.-D. Yang
Rev. Mat. Iberoam.   30 309-316   Mar 2014   [Refereed]
A construction of a complete bounded null curves in C^3
L. Ferrer, F. Martin, M. Umehara and K. Yamada
Kodai Mathematical Journal   37 59-96   Mar 2014   [Refereed]
Closed planar curves without inflections
S. Ohno T.Ozawa and M. Umehara
Proc. Amer. Math. Soc.   141 651-665   2013   [Refereed]
A duality for conformally flat hypersurfaces
U. Hertrich-Jeromin, Y. Suyama, M. Umehara and K. Yamada
Beiträge zur Algebra und Geometrie / Contributions to Algebra and Geometry   56 655-676   [Refereed]

Misc

 
Catherine McCunea, Masaaki Umehara
Differential Geometry and its Applications   20(2) 197-207   2004
Journal of the Mathematical Society of Japan   40(3) 519-539   1988
Einstein Kaehler submanifolds of a comples linear or hyperbolic space
The Tohoku Mathematical Journal   39(3) 385-389   1987
Transactions of the American Mathematical Society   330(2) 845-857   1992
Hiroyuki Tasaki, Masaaki Umehara, Kotaro Yamada
Japanease Journal of Mathematics   17(2) 383-399   1991

Books etc

 
Differential and Symplectic Topology of Knots and Curves (American Mathematical Society Translations: Series 2, vol.190)
S. Tabachnikov (Part:Contributor, A unified approach to the four vertex theorem I)
American Mathematical Society   1999   ISBN:9780821813546
Differential and Symplectic Topology of Knots and Curves (American Mathematical Society Translations: Series 2, vol.190)
S. Tabachnikov (Part:Contributor, Gudlaugur Thorbergsson and Masaaki Umehara "A unified approach to the four vertex theorems II")
American Mathematical Society   1999   ISBN:9780821813546

Conference Activities & Talks

 
Hypersurfaces with light-like points in Lorentzian manifolds [Invited]
UMEHARA Masaaki
15th International Workshop on Real and Complex Singularities, Brail   27 Jul 2018   
Indices of isolated umbilics on surfaces [Invited]
UMEHARA Masaaki
Geometric Analysis in Geometery and Topology   12 Nov 2015   
Intrinsic properties of surfaces with singularities [Invited]
UMEHARA Masaaki
Real Singularities and applications   17 Feb 2014   

Association Memberships

 
 

Research Grants & Projects

 
Surface of constant mean curvature 1 in the hyperbolic 3-space
Vertices on planar curves
A construction of minimal surfaces in the Euclidean 3- space with prescribed flux