• 대한수학회지
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• 제43권2호
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• pp.283-296
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• 2006

In this paper we weaken the kernel conditions of bilinear Calderon-Zygmund operators and prove boundedness on Besov spaces.

• 대한수학회보
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• 제35권4호
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• pp.629-640
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• 1998

The original work for representing derivative operators in the wavelet bases was done by Beylkin in [2]. In this paper we present an alternative and easier derivation.

• 대한수학회보
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• 제20권2호
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• pp.75-79
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• 1983

In this paper we shall continue the study of the approximation theorems in the double pseudodifferential operators as in the single pseudodifferential operators.

• 한국수학교육학회지시리즈A:수학교육
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• 제25권3호
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• pp.43-45
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• 1987

In this paper we will investigate the relations between Dunford-Pettis operators and weakly compact operators. And we get a characterization of a Banach space with the RNP.

• 대한수학회논문집
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• 제11권4호
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• pp.937-958
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• 1996

On the setting of product of balls we consider Toeplitz operators, with symbols satisfying a certain condition, on the Bergman space. Norms and essential norms of such operators are estimated by means of certain integral quantities.

• 대한수학회지
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• 제42권2호
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• pp.387-403
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• 2005

In this note we consider the hyponormality of Toeplitz operators $B_\varphi$ on the Bergman space $L_a^2$ (D) with symbol in the class of functions f + g with polynomials f and g

• 대한수학회논문집
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• 제14권1호
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• pp.171-177
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• 1999

We study some properties of Toeplitz operators on the Bergman spaces B\ulcorner(H\ulcorner), where H\ulcorner={x+iy : y>r}. We consider the pseudo-hyperbolic disk and the covering property. We also obtain some characterizations of compact Toeplitz operators.

• 대한수학회보
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• 제38권1호
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• pp.205-210
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• 2001

We give a characterization of regular operators that allows us to prove that a bounded operator acting between Banach spaces is almost regular if and only if it is regular, solving an open problem in [5]. As an application, we show that some operators in the closure of the set of all regular operators are regular.

• 대한수학회보
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• 제48권1호
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• pp.141-149
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• 2011

We consider the problem to determine when a Toeplitz operator is bounded on weighted Bergman spaces. We show that Toeplitz operators induced by elements of some set are bounded and each element of the set is related with a Carleson measure on the weighted Bergman space.

• 대한수학회지
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• 제48권5호
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• pp.1053-1063
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• 2011

We discuss the perturbation theory of "left" and "right" Browder operators, which come somewhere between Browder operators and semi Browder operators.