Papers

Number of the published data : 40
No. Publishing type Authorship Title Author Journal Publisher Volume/issue/page Publication date ISSN DOI URL Summary
1 Research paper (scientific journal)
Joint
Loop type subcontinua of positive solutions for indefinite concave-convex problems
Uriel Kaufmann, Humberto Ramos Quoirin, Kenichiro Umezu
Advanced Nonlinear Studies

19/ 2, 391-412
2019

10.1515/ans-2018-2027


2 Research paper (scientific journal)
Joint
An elliptic equation with an indefinite sublinear boundary condition
Humberto Ramos Quoirin, Kenichiro Umezu
Advances in Nonlinear Analysis

8/ 1, 175-192
2019

10.1515/anona-2016-0023


3 Research paper (scientific journal)
Joint
Positive solutions of an elliptic Neumann problem with a sublinear indefinite nonlinearity
Uriel Kaufmann, Humberto Ramos Quoirin, Kenichiro Umezu
Nonlinear Differential Equations and Applications NoDEA

25:12
2018

10.1007/s00030-018-0502-1


4 Research paper (scientific journal)
Joint
A loop type component in the non-negative solutions set of an indefinite elliptic problem
Humberto Ramos Quoirin, Kenichiro Umezu
Communications on Pure and Applied Analysis

17/ 3, 1255-1269
2018

10.3934/cpaa.2018060


5 Research paper (scientific journal)
Joint
Positivity results for indefinite sublinear elliptic problems via a continuity argument
Uriel Kaufmann, Humberto Ramos Quoirin, Kenichiro Umezu
Journal of Differential Equations

263/ 8, 4481-4502
2017

10.1016/j.jde.2017.05.021


6 Research paper (scientific journal)
Joint
An indefinite concave-convex equation under a Neumann boundary condition II
Humberto Ramos Quoirin, Kenichiro Umezu
Topological Methods in Nonlinear Analysis

49/ 2, 739-756
2017

10.12775/TMNA.2017.007


7 Research paper (scientific journal)
Joint
An indefinite concave-convex equation under a Neumann boundary condition I
Humberto Ramos Quoirin, Kenichiro Umezu
Israel Journal of Mathematics

220/ 1, 103-160
2017

10.1007/s11856-017-1512-0


8 Research paper (scientific journal)
Joint
Positive steady states of an indefinite equation with a nonlinear boundary condition: existence, multiplicity and asymptotic profiles
Humberto Ramos Quoirin, Kenichiro Umezu
Calculus of Variations and Partial Differential Equations

55/ 4, No.102-47pp.
2016

10.1007/s00526-016-1033-4


9 Research paper (scientific journal)
Joint
On a concave-convex elliptic problem with a nonlinear boundary condition
Humberto Ramos Quoirin, Kenichiro Umezu
Annali di Matematica Pura ed Applicata

195/ 6, 1833-1863
2016

10.1007/s10231-015-0531-x


10 Research paper (scientific journal)
Joint
Bifurcation for a logistic elliptic equation with nonlinear boundary conditions: A limiting case
Humberto Ramos Quoirin, Kenichiro Umezu
Journal of Mathematical Analysis and Applications

428/ 2, 1265-1285
2015

10.1016/j.jmaa.2015.04.005


11 Research paper (scientific journal)
Joint
The effect of indefinite nonlinear boundary conditions on the structure of the positive solutions set of a logistic equation
Humberto Ramos Quoirin, Kenichiro Umezu
Journal of Differential Equations

257/ 11, 3935-3977
2014

10.1016/j.jde.2014.07.016


12 Research paper (scientific journal)
Only
Global structure of supercritical bifurcation with turning points for the logistic elliptic equation with nonlinear boundary conditions
Kenichiro Umezu
Nonlinear Analysis: Theory, Methods & Applications

89, 250-266
2013

10.1016/j.na.2013.05.011


13 Research paper (scientific journal)
Only
Bifurcation approach to a logistic elliptic equation with a homogeneous incoming flux boundary condition
Kenichiro Umezu
Journal of Differential Equations

252/ 2, 1146-1168
2012

10.1016/j.jde.2011.08.043


14 Research paper (scientific journal)
Only
Global bifurcation results for semilinear elliptic boundary value problems with indefinite weights and nonlinear boundary conditions
Kenichiro Umezu
Nonlinear Differential Equations and Applications NoDEA

17/ 3, 323-336
2010

10.1007/s00030-010-0056-3


15 Research paper (scientific journal)
Only
Blowing-up properties of the positive principal eigenvalue for indefinite Robin-type boundary conditions
Kenichiro Umezu
Rocky Mountain Journal of Mathematics

40/ 2, 673-694
2010

10.1216/RMJ-2010-40-2-673


16 Research paper (scientific journal)
Only
Blowing-up of principal eigenvalues for Neumann boundary conditions
Kenichiro Umezu
Proceedings of the Royal Society of Edinburgh Section A: Mathematics

137/ 3, 567-579
2007

10.1017/S0308210506000060


17 Research paper (scientific journal)
Only
Positive solutions of semilinear elliptic eigenvalue problems with concave nonlinearities
Kenichiro Umezu
Advances in Differential Equations

12/ 12, 1415-1436
2007


URL

18 Research paper (scientific journal)
Only
On eigenvalue problems with Robin type boundary conditions having indefinite coefficients
Kenichiro Umezu
Applicable Analysis

85/ 11, 1313-1325
2006

10.1080/00036810500337860


19 Research paper (international conference proceedings)
Only
One parameter-dependent nonlinear elliptic boundary value problems arising in population dynamics
Kenichiro Umezu
Advances in analysis
World Scientific
177-186
2005

10.1142/9789812701732_0013


20 Research paper (international conference proceedings)
Only
Non-existence of positive solutions for diffusive logistic equations with nonlinear boundary conditions
Kenichiro Umezu
Progress in Nonlinear Differential Equations and Their Applications
Springer
64, 497-507
2005

10.1007/3-7643-7385-7_29


21 Research paper (scientific journal)
Only
Local bifurcation analysis and stability of steady-state solutions of diffusive logistic equations with nonlinear boundary conditions
Kenichiro Umezu
Communications in Applied Analysis

8/ 4, 533-547
2004


URL

22 Research paper (scientific journal)
Only
Multiplicity of positive solutions under nonlinear boundary conditions for diffusive logistic equations
Kenichiro Umezu
Proceedings of the Edinburgh Mathematical Society

47/ 2, 495-512
2004

10.1017/S0013091503000294


23 Research paper (international conference proceedings)
Only
Bifurcation analysis in diffusive logistic equations with nonlinear boundary conditions
Kenichiro Umezu
Progress in analysis, Vol. I, II (Berlin, 2001), World Sci. Publishing, River Edge, NJ
World Scientific
1135-1141
2003

10.1142/9789812794253_0131


24 Research paper (scientific journal)
Only
Bifurcation from infinity for asymptotically linear elliptic eigenvalue problems
Kenichiro Umezu
Journal of Mathematical Analysis and Applications

267/ 2, 651-664
2002

10.1006/jmaa.2001.7799


25 Research paper (scientific journal)
Only
Behavior and stability of positive solutions of nonlinear elliptic boundary value problems arising in population dynamics
Kenichiro Umezu
Nonlinear Analysis: Theory, Methods & Applications

49/ 6, 817-840
2002

10.1016/S0362-546X(01)00142-0


26 Research paper (international conference proceedings)
Only
Bifurcation in population dynamics
Kenichiro Umezu
Elliptic and parabolic problems (Rolduc/Gaeta, 2001), World Sci. Publishing, River Edge, NJ
World Scientific
485-493
2002

10.1142/9789812777201_0046


27 Research paper (international conference proceedings)
Joint
Stability in chemical reactor theory
Kazuaki Taira and Kenichiro Umezu
Evolution equations and their applications in physical and life sciences (Bad Herrenalb, 1998), Lecture Notes in Pure and Appl. Math., 215, Dekker, New York
CRC Press
421-433
2001




28 Research paper (international conference proceedings)
Only
Bifurcation and stability for diffusive logistic equations with nonlinear boundary conditions
Kenichiro Umezu
Nonlinear Boundary-Value Problems, IAMM of NAS of Ukraine

10, 193-198
2000




29 Research paper (scientific journal)
Only
Global positive solution branches of positone problems with nonlinear boundary conditions
Kenichiro Umezu
Differential and Integral Equations

13/ 4-6, 669-686
2000


URL

30 Research paper (scientific journal)
Only
Nonlinear elliptic boundary value problems suggested by fermentation
Kenichiro Umezu
Nonlinear Differential Equations and Applications NoDEA

7/ 2, 143-155
2000

10.1007/s000300050002


31 Research paper (international conference proceedings)
Joint
Positive solutions of semilinear elliptic boundary value problems in chemical reactor theory
Kenichiro Umezu, Kazuaki Taira
Direct and inverse problems of mathematical physics (Newark, DE, 1997), Int. Soc. Anal. Appl. Comput., 5, Kluwer Acad. Publ., Dordrecht

415-422
2000

10.1007/978-1-4757-3214-6_24


32 Research paper (scientific journal)
Joint
Growing-up positive solutions of semilinear elliptic boundary value problems
Kenichiro Umezu, Kazuaki Taira
Journal of Mathematical Analysis and Applications

238/ 1, 196-215
1999

10.1006/jmaa.1999.6522


33 Research paper (scientific journal)
Only
Positive solutions of a forced nonlinear elliptic boundary value problem
Kenichiro Umezu
Journal of the Mathematical Society of Japan

51/ 4, 801-815
1999

10.2969/jmsj/05140801


34 Research paper (scientific journal)
Only
Multiplicity of positive solutions to semilinear elliptic boundary value problems
Kenichiro Umezu
Abstract and Applied Analysis

4/ 3, 195-208
1999

10.1155/S1085337599000147


35 Research paper (scientific journal)
Joint
Semilinear elliptic boundary value problems in chemical reactor theory
Kazuaki Taira, Kenichiro Umezu
Journal of Differential Equations

142/ 2, 434-454
1998

10.1006/jdeq.1997.3349


36 Research paper (scientific journal)
Joint
Positive solutions of sublinear elliptic boundary value problems
Kazuaki Taira, Kenichiro Umezu
Nonlinear Analysis: Theory, Methods & Applications

29/ 7, 761-771
1997

10.1016/S0362-546X(96)00059-4


37 Research paper (scientific journal)
Joint
Bifurcation for nonlinear elliptic boundary value problems III
Kazuaki Taira, Kenichiro Umezu
Advances in Differential Equations

1/ 4, 709-727
1996


URL

38 Research paper (scientific journal)
Joint
Bifurcation for nonlinear elliptic boundary value problems II
Kazuaki Taira, Kenichiro Umezu
Tokyo Journal of Mathematics

19/ 2, 387-396
1996

10.3836/tjm/1270042527


39 Research paper (scientific journal)
Only
L^p-approach to mixed boundary value problems for second-order elliptic operators
Kenichiro Umezu
Tokyo Journal of Mathematics

17/ 1, 101-123
1994

10.3836/tjm/1270128189


40 Research paper (scientific journal)
Only
On the Cauchy problem for analytic semigroups with weak singularity
Kenichiro Umezu
Tsukuba Journal of Mathematics

15/ 2, 275-292
1991

10.21099/tkbjm/1496161656