[논문]
Eungil Ko, 김연하,
On Hyponormality of the Sum of Two Composition Operators,
Filomat,
Vol.36,
No.11,
pp. 3561-3572
(12월, 2022)
[논문]
Eungil Ko, 김연하,
Characterizations of Square Roots of Unitary Weighted Composition Operators on H2,
COMPLEX ANALYSIS AND OPERATOR THEORY,
pp. 10.1007-22pages
(1월, 2022)
[논문]
김연하, Takahiko Nakazi, 고응일, 이종락,
Hyponormality of singular Cauchy integral operators with matrix-valued symbols,
HOKKAIDO MATHEMATICAL JOURNAL,
Vol.48,
No.2,
pp. 443-459
(8월, 2019)
[논문]
Eungil Ko, Hanna Choi, 김연하,
On operators satisfying the generalized Cauchy-Schwarz inequality,
PROCEEDINGS OF THE AMERICAN MATHEMATICAL SOCIETY,
pp. 3447-3453
(1월, 2017)
[논문]
Eungil Ko, Seonjin Jo, 김연하,
On Fuglede-Putnam properties,
POSITIVITY,
pp. 911-925
(12월, 2015)
[논문]
김연하, Eungil Ko, Sungeun Jung,
Iterated Aluthge transforms of composition operators on H2,
INTERNATIONAL JOURNAL OF MATHEMATICS,
pp. 1550079-1550079
(8월, 2015)
[논문]
김연하, Eungil Ko, Sungeun Jung,
Characterizations of binormal composition operators with linear fractional symbols on H2,
APPLIED MATHEMATICS AND COMPUTATION,
pp. 252-263
(6월, 2015)
[논문]
김연하, Eungil Ko, Sungeun Jung, Jieun Lee,
Complex symmetric weighted composition operators on H2(D),
JOURNAL OF FUNCTIONAL ANALYSIS,
pp. 323-351
(7월, 2014)
[논문]
Eungil Ko, Sungeun Jung, 김연하,
Commutators of weighted composition operators,
INTERNATIONAL JOURNAL OF MATHEMATICS,
pp. 1450053-1450053
(5월, 2014)
[논문]
김연하, Eungil Ko, Sungeun Jung,
Composition operators for which C _{phi }^{AST } C _{phi } and C _{phi } +C _{phi } ^{AST } commute,
COMPLEX VARIABLES AND ELLIPTIC EQUATIONS,
pp. 1608-1625
(1월, 2014)
[논문]
김연하, Eungil Ko, Sungeun Jung,
On subscalarity of some 2 × 2 class A operator matrices,
LINEAR ALGEBRA AND ITS APPLICATIONS,
pp. 1322-1338
(2월, 2013)
[논문]
김연하, Eungil Ko, Sungeun Jung, Jieun Lee,
On (A;m)-expansive operators,
STUDIA MATHEMATICA,
pp. 3-23
(12월, 2012)
[논문]
김연하, Eungil Ko, Insook Kim, Jieun Lee,
Some connections between an operator and its Helton class,
JOURNAL OF MATHEMATICAL ANALYSIS AND APPLICATIONS,
pp. 1235-1249
(4월, 2008)
[논문]
김연하, Jieun Lee, Eungil Ko,
On the Helton class of p-hyponormal operators,
PROCEEDINGS OF THE AMERICAN MATHEMATICAL SOCIETY,
pp. 2113-2120
(7월, 2007)