Updated on 2020/10/20

写真a

 
UCHIYAMA Atsushi
 
Title
Associate Professor(Moving Out or Retirement)

Graduating School

  • Yamagata University, Faculty of Science, Department of Mathematics

    1992.03, Graduated

Graduate School

  • Tohoku University, Graduate School, Division of Natural Science

    Master's Course, 1995.03, Completed

  • Tohoku University, Graduate School, Division of Natural Science

    Doctor's Course, 1999.03, Completed

External Career

  • , Special researcher of the Japan Society for the Promotion of Science, 1999.04 - 2002.03

  • Sendai National College of Technology, Associate Professor (as old post name), 2004.04 - 2006.03

  • Sendai National College of Technology, Associate Professor, 2006.04 - 2008.09

 

Research Career

  • Non-normal Hilbert space operators related to operator inequalities, 1995.04 -

Papers

  • Quasinormality and subscalarity of class p - wA(s,t) operators, Funct. Anal. Approx. Comput. , 9(1) 61-68, 2017.12

    Tanahashi K., Prasad T., Uchiyama A.

    Multiple Authorship (Including Foreigners)

  • Spectrum of class p-wA(s,t) operators. , Acta. Math. (Szeged), 82 641-649, 2016.12

    Chō Muneo, Rashid M. H. M., Tanahashi Kotaro, Uchiyama Atsushi

    Multiple Authorship (Including Foreigners)

  • Superadditivity and derivative of operator function, Linear Algebra Appl., 465 401-411, 2015.12

    M. Uchiyama, A. Uchiyama and M. Giga

    Multiple Authorship (Including Foreigners)

  • A note on *-paranormal operators, Bull. Korean. Math. Soc., 51 357-371, 2014.12

    A. Uchiyama and K. Tanahashi

    Single Author

  • Chaotic condition of subshifts on symbolic dynamical systems, Far East J. Dyn. Syst., 24 53-67, 2014.12

    A. Uchiyama, S. Kawamura and H. Takaegara

    Multiple Authorship (Including Foreigners)

  • On polynomially *-paranormal operators, Functional Analysis, Approximation and Computation, 5 11-16, 2013.12

    L. Zhang, K. Tanahashi, A. Uchiyama and M. Cho

    Multiple Authorship (Including Foreigners)

  • Spectral properties of m-isometric operators, Functional Analysis, Approximation and Computation, 4(2) 33-39, 2012.12

    M. Cho, S. Ota, K. Tanahashi and A. Uchiyama

    Multiple Authorship (Including Foreigners)

  • The single valued extension property for hereditarily normaloid operators, Sci. Math. Jpn., 74 185-189, 2011.12

    A. Uchiyama and K. Tanahashi

    Multiple Authorship (Including Foreigners)

  • Numerical radius and unitarity, Acta. Math. (Szeged), 76 581-584, 2010.12

    T. Sano and A. Uchiyama

    Multiple Authorship (Including Foreigners)

  • Weyl type theorem for (p, k)-quasihyponormal operators, Scientiae Mathematicae Japonicae, 69 411-417, 2009.12

    S. Mecheri, K. Tanahashi, A. Uchiyama

    Multiple Authorship (Including Foreigners)

  • Bishop's property (β) for paranormal operators, Operators and Matrices, 3 517-524, 2009.12

    A. Uchiyama, K. Tanahashi

    Multiple Authorship (Including Foreigners)

  • On extensions of some Fuglede-Putnam type theorems involving (p, k)-quasihyponormal, spectral, and dominant operators, Math. Nachr. , 282 1022-1032, 2009.12

    S. Patel, K. Tanahashi, A. Uchiyama

    Multiple Authorship (Including Foreigners)

  • Conditions implying self-adjointness od operatros, Integral Equations and Operator Theory, 61 549-557, 2008.12

    I. H. Jeon, I. H. Kim, K. Tanahashi, A. Uchiyama

    Multiple Authorship (Including Foreigners)

  • A purturbation of normal operators on a Hilbert space, Nonlinear Functional Analysis and Applications, 13 291-297, 2008.12

    T. Miura, H. Oka, G. Hirasawa, S. Takahasi, N. Niwa, A. Uchiyama

    Multiple Authorship (Including Foreigners)

  • Putnam inequality for class A operators and an operator transform by Cho and Yamazaki, AScientiae Mathematicae Japonicae Online, e-2007 613-621, 2007.12

    S. M. Patel, M. Cho, K. Tanahashi, A. Uchiyama

    Multiple Authorship (Including Foreigners)

  • On the isolated point of paranormal operators, Integral Equations and Operator Theory, 55 145-151, 2006.12

    A. Uchiyama

    Single Author

  • Fuglede-Putnam theorem for p-hyponormal or class A operators, Bull. Korean. Math. Soc., 43 747-753, 2006.12

    S. Mecheri, K. Tanahashi, A. Uchiyama

    Multiple Authorship (Including Foreigners)

  • Quasisimilarity and Fuglede-Putnam theorem for class A(s,t) operators, Nihonkai Mathematical Journal, 17 49-67, 2006.12

    A. Uchiyama, S. M. Patel, K. Tanahashi, M. Yanagida

    Multiple Authorship (Including Foreigners)

  • On p-quasihyponormal operators, Nihonkai mathematical Journal, 16 113-128, 2005.12

    A. Uchiyama

    Single Author

  • A note on an operator transform S(T), Scientiae Mathematicae Japonicae Online, e-2005 433-447, 2005.12

    S. M. Patel, K. Tanahashi, A. Uchiyama

    Multiple Authorship (Including Foreigners)

  • On quasisimilarity for log-hyponormal operators, Glasgow mathematical Journal, 46 169-176, 2004.12

    I. H. Jeon, K. Tanahashi, A. Uchiyama

    Multiple Authorship (Including Foreigners)

  • Spectrum of class A(s, t) operators, Acta. Math. (Szeged), 70 279-287, 2004.12

    K. Tanahashi, A. Uchiyama, J. I. Lee

    Multiple Authorship (Including Foreigners)

  • Isolated point of spectrum of (p,k)-quasihyponormal operators, Linear Algebras and its Applications, 382 221-229, 2004.12

    A. Uchiyama, K. Tanahashi, M. Cho

    Multiple Authorship (Including Foreigners)

  • The σ-convexity of all bounded convex sets in R^n and C^n, Nihonkai Mathematical Journal, 14 61-64, 2003.12

    H. Takemoto, A. Uchiyama

    Multiple Authorship (Including Foreigners)

  • On p-quasihyponormal operators and quasisimilarity, Mathematical Inequalities and Applications, 6 309-315, 2003.12

    I. H. Jeon, J. I. Lee, A. uchiyama

    Multiple Authorship (Including Foreigners)

  • An example of non-reducing eigenspace of a paranormal operator, Nihonkai Mathematical Journal, 14 121-123, 2003.12

    A. Uchiyama

    Single Author

  • A remark of the numerical ranges of operators, Nihonkai Mathematical Journal, 13 1-7, 2002.12

    H. Takemoto, A. Uchiyama

    Multiple Authorship (Including Foreigners)

  • On Schwarz type inequalities , Proceedings of the American Mathematical Society, 131 2549-2552, 2002.12

    K. Tanahashi, M. Uchiyama, A. Uchiyama

    Multiple Authorship (Including Foreigners)

  • Isolated point of spectrum of p-quasihyponormal operators, Linear Algebras and its Applications, 341 345-350, 2002.12

    A. Uchiyama, K. Tanahashi

    Multiple Authorship (Including Foreigners)

  • On the Riesz idempotent of class A operators, Mathematical Inequalities and Applications, 5 291-298, 2002.12

    A. Uchiyama, K. Tanahashi

    Multiple Authorship (Including Foreigners)

  • Fuglede-Putnam's theorem for p-hyponormal operators, Glasgow Math. J., 44 397-410, 2002.12

    A. Uchiyama, K. Tanahashi

    Multiple Authorship (Including Foreigners)

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Grant-in-Aid for Scientific Research

  • Grant-in-Aid for Scientific Research(C)，2018.04 - 2020.03