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지용성 β-sitosterol 치환제의 합성 및 콜레스트롤 저하 효과
정대원 수원대학교 산업기술연구소 1998 산업기술연구소논문집 Vol.13 No.-
β-sitosteryl oleate was synthesized by transesterification reaction of β-sitosterol with methyl oleate. Total cholesterol values of male rats fed with high cholesterol diet were significantly decreased by administration of β-sitosteryl oleate. It was possible to dissolve β-sitosteryl oleate in oils by formulation with methyl oleate.
A Note on Two Weight Inequalities for the Dyadic Paraproduct
정대원 영남수학회 2020 East Asian mathematical journal Vol.36 No.3
In this paper, we provide detailed proof of the Sawyer type characterization of the two weight estimate for the dyadic paraproduct. Although the dyadic paraproduct is known to be a well localized opera- tors and the testing conditions obtained from checking boundedness of the given localized operator on a collection of test functions are provided by many authors. The main purpose of this paper is to present the neces- sary and sufficient conditions on the weights to ensure boundedness of the dyadic paraproduct directly.
클레이의 Silane Coupling Agent 처리에 관한 연구
정대원 水原大學校 2004 論文集 Vol.22 No.-
Natural clay(sodium-montmorillonite) and commercially available organo-clays were reacted with silane coupling agent (SCA) to improve the hydrophobicity of clays. This reaction was found to be very sensitive to many factors such as reaction temperature, water content and the concentration of SCA in reaction medium. In some cases, siloxane groups(Si-O-Si) were also produced by intermolecular cross-linking among SCAB. Organo-clays modified with SCA were compounded with PP-MA, however, no further intercalation was observed.
Two Weight Estimate for the Paraproduct in the Space of Homogeneous Type
정대원 영남수학회 2019 East Asian mathematical journal Vol.35 No.3
In this paper, we provide sufficient conditions of a pair of weights (u, v) and a function b so that the dyadic paraproduct is bounded from L2u(X) into L2v(X), where X is a space of homegeneous type. In order to prove the main result we use the honest dyadic system introduced in [10].