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Electrochemical Fabrication of Nanostructures on Porous Silicon for Biochemical Sensing Platforms
Ko, E.,Hwang, J.,Kim, J. H.,Lee, J. H.,Lee, S. H.,Tran, V.-K.,Chung, W. S.,Park, C. H.,Choo, J.,Seong, G. H. Japan Society for Analytical Chemistry 2016 Analytical sciences Vol.32 No.6
<P>We present a method for the electrochemical patterning of gold nanoparticles (AuNPs) or silver nanoparticles (AgNPs) on porous silicon, and explore their applications in: (1) the quantitative analysis of hydroxylamine as a chemical sensing electrode and (2) as a highly sensitive surface-enhanced Raman spectroscopy (SERS) substrate for Rhodamine 6G. For hydroxylamine detection, AuNPs-porous silicon can enhance the electrochemical oxidation of hydroxylamine The current changed linearly for concentrations ranging from 100 mu M to 1.32 mM (R-2 = 0.995), and the detection limit was determined to be as low as 55 mu M. When used as SERS substrates, these materials also showed that nanoparticles decorated on porous silicon substrates have more SERS hot spots than those decorated on crystalline silicon substrates, resulting in a larger SERS signal. Moreover, AgNPs-porous silicon provided five-times higher signal compared to AuNPs-porous silicon. From these results, we expect that nanoparticles decorated on porous silicon substrates can be used in various types of biochemical sensing platforms.</P>
On complex symmetric Toeplitz operators
Ko, E.,Lee, J.E. Academic Press 2016 Journal of mathematical analysis and applications Vol.434 No.1
<P>In this paper, we give a characterization of a complex symmetric Toeplitz operator T-phi on the Hardy space H-2. Moreover, if T-phi is a complex symmetric Toeplitz operator, we provide a necessary and sufficient condition for T-phi to be normal. Finally, we investigate these T-phi with finite symbols. (C) 2015 Elsevier Inc. All rights reserved.</P>
On the Dilation of Truncated Toeplitz Operators
Ko, E.,Lee, J. E. Springer Science + Business Media 2016 Complex analysis and operator theory Vol.10 No.4
<P>An operator is called the dilation of a truncated Toeplitz operator if for two symbols and an inner function u, holds for where denotes the orthogonal projection of onto the model space and In this paper, we study properties of the dilation of truncated Toeplitz operators on . In particular, we provide conditions for the dilation of truncated Toeplitz operators to be normal. As some applications, we give several examples of such operators.</P>
On subscalarity of some 2x2 class A operator matrices
Ko, E.,Jung, S.,Kim, Y. North Holland [etc.] 2013 Linear algebra and its applications Vol.438 No.3
In this paper we provide some conditions for 2x2 operator matrices whose diagonal entries are class A operators to be subscalar. As a corollary, we get that such operators with rich spectra have nontrivial invariant subspaces. In addition, we show that the tensor product of a 2x2 upper triangular class A operator matrix and a class A operator has a scalar extension. Finally, we find some subscalar 2x2 operator matrices satisfying the operator equations ABA=A<SUP>2</SUP> and BAB=B<SUP>2</SUP>.
Wei-Loon KOE(Wei-Loon KOE),Ririn WULANDARI(Ririn WULANDARI ) 한국유통과학회 2023 The Journal of Asian Finance, Economics and Busine Vol.10 No.1
This study examined the relationships among owner-manager characteristics, e-commerce adoption, and performance of small and medium enterprises (SMEs) in Malaysia. Although the growth of e-commerce was encouraging in many countries, studies of e-commerce adoption among SMEs in developing countries such as Malaysia are insufficient. Furthermore, studies that investigated individual characteristics and e-commerce adoption are still low in number. This study specifically employed the technology-organization-environmental (TOE) framework to develop its research model. The sample was selected by using a non-probability judgmental sampling technique because the desired population frame was unavailable. A total of 111 owner-managers of SMEs were surveyed using online self-administered questionnaires. Subsequently, the data was analyzed through partial least square-structural equation modeling (PLS-SEM). The results revealed significant relationships between owner-manager characteristics and e-commerce adoption, as well as between e-commerce adoption and the performance of SMEs. The findings suggested that owner-manager characteristics played an important role in determining e-commerce adoption among SMEs. Moreover, e-commerce adoption was crucial in affecting the performance of SMEs. This paper provided new insights into factors affecting e-commerce adoption and firm performance. It could further benefit the government and SMEs in strategizing e-commerce adoption and development, especially in the era of Industrial Revolution 4.0 (IR 4.0) and the post-COVID-19 pandemic.