Insu Park

A new copper catalyst was developed by immobilizing copper nanoparticles in aluminum oxyhydoxide fiber. The catalyst showed high catalytic activity for the (3+2) Huisgen cycloaddition of nonactivated alkynes as well as activated ones with various azides at room temperature. The catalyst was recycled five times without significant loss of activity.

We propose a new power-splitting scheme in two-dimensional photonic crystals that can be applicable to photonic integrated circuits. The proposed power-splitting mechanism is analogous to that of conventional three-waveguide directional couplers, utilizing coupling between guided modes supported by line-defect waveguides. Through the analysis of dispersion curve and field patterns of modes, the position in propagation direction, where an input field is split into a two-folded image, is determine

Platinum-modified Au nanoparticles on a carbon support were prepared using carbon-supported Au nanoparticles as a substrate and a successive reduction process. These nanoparticles were applied as an electrocatalyst for formic acid electro-oxidation. The uniform Pt-modified Au nanoparticles (<5 nm in diameter) were highly dispersed on the carbon particles, and the Au surface was deposited with nanoscaled Pt. The Pt-modified Au nanoparticles showed higher electrocatalytic activities than the pure

Abstract The recyclable metal nanoparticle catalysts, rhodium in aluminum oxyhydroxide [Rh/AlO(OH)] and iridium in aluminum oxyhydroxide [Ir/AlO(OH)], were simply prepared from readily available reagents. The catalysts showed high activities in the hydrogenation of various arenes and ketones under mild conditions. Selective hydrogenation was possible for bicyclic and tricyclic arenes in high yields. The catalysts were active at room temperature even with a hydrogen balloon. Also, the catalysts s

A new recyclable rhodium catalyst was synthesized by a simple procedure from readily available reagents, which showed high activities in the hydrogenation of various arenes under 1 atm H2 at room temperature.

This paper examines how an individual’s disaster experience affects his or her perceptions of sociotechnical safety factors (risk, information assurance, resilience) and perceived usefulness of hospital information systems (HIS). This paper consists of two studies focusing on different aspects: a quasi-field experiment conducted with employees in three hospitals affected by a severe snowstorm (labeled a federal disaster) (N = 103), where we compare the perceptual factors in the context of the di

The rapid and unexpected spread of SARS-CoV-2 worldwide has caused unprecedented disruption to daily life and has brought forward critical challenges for public health. The disease was the largest cause of death in the United States in early 2021. Likewise, the COVID-19 pandemic has highlighted the need for rapid and accurate diagnoses at scales larger than ever before. To improve the availability of current gold standard diagnostic testing methods, the development of point-of-care devices that

This study explores how third-party assurance seals, a privacy service provided by vendors to mitigate customers' fears, has an impact on on-line customer satisfaction and repeat-purchase intention. It asks the following research questions: Do assurance seals influence on-line service experience? If so, how do they affect consumers' satisfaction and repeat-purchase intention? The study shows, first, that seals provide a frame such that a consumer's overall satisfaction and repeat-purchase intent

ABSTRACT This article explores the theoretical underpinnings of the dissonance framework in online consumer satisfaction formation process. Specifically, we suggest that any discrepancy between pre‐ and post‐purchase service performance would help determine consumers’ evaluations of online vendors. Drawing upon cognitive dissonance theory, a conceptual model is developed and tested in two different studies (preliminary and main studies). Using data from 191 college students collected longitudina