WHEN INTERACTIVE TV MEETS ONLINE AUCTION: A STUDY ON FACTORS AFFECTING USER ADOPTION (Completed academic paper)

users ’ attitude to adopt the interactive TV based auction service. The primary two factors, IQ and SQ, frequently have been found in a number of IS studies as significant factors affecting users ’ attitude toward innovative products or services. In this study, we adopted the two factors and trust as a mediated factor to explain how the factors affect users ’ attitude for the interactive TV based auction service, t-auction. In order to empirically verify our research model, we collected 1028 samples through online survey. By doing confirmatory factor analysis, we checked that the research model satisfied the convergent, discriminant validity and model fits. The results showed that all factors including IQ, SQ, and Trust have significant effects on users ’ attitude. Additionally, both IQ and SQ had greater direct influence on trust than their direct impact on attitude, and the direct effect of SQ on attitude was greater than the direct effect of IQ on attitude. We discussed the implications of this study in the last section of the paper

High-performance polymer light emitting diodes with interface-engineered graphene anodes

Recently, graphene-based organic light emitting diodes (OLEDs) were successfully demonstrated using graphene as anodes. However, the graphene electrodes have not been utilized for polymer light emitting diodes (PLEDs) yet, although the simpler device structure and the solution-based fabrication process of PLEDs are expected to be more advantageous in terms of time and cost. Here we demonstrate high-performance polymer light emitting diodes (PLEDs) with simple two-layer structures using interface-engineered single-layer graphene films as anodes. The single-layer graphene synthesized by chemical vapor deposition methods was transferred onto a glass substrate utilizing an elastic stamp, and its work function was engineered by varying the duration and the power of ultraviolet ozone (UVO) treatment. Thus, we were able to optimize the contact between silver electrodes and the graphene anodes, leading to the considerable enhancement of light-emitting performance. (C) 2013 Elsevier B.V. All rights reserved.This work was supported by the OLED center of Samsung Display and Seoul National University, the Industrial Strategic Technology Development Program (KI002104, Development of Fundamental Technologies for Flexible Combined-Function Organic Electronic Device), the Global Research Lab (GRL) Program (2011-0021972), the Global Frontier Research Program (2011-0031627), and the Basic Science Research Program (2012M3A7B4049807, 2011-0017587 and 2009-0083540) through the National Research Foundation of Korea (NRF) funded by the Korean government (MEST and MKE).OAIID:oai:osos.snu.ac.kr:snu2013-01/102/0000029430/3SEQ:3PERF_CD:SNU2013-01EVAL_ITEM_CD:102USER_ID:0000029430ADJUST_YN:YEMP_ID:A076109DEPT_CD:430CITE_RATE:3.836FILENAME:organic electronics 14, 2324 (sep, 2013).pdfDEPT_NM:전기·정보공학부EMAIL:[email protected]_YN:YCONFIRM:

Proton Switch in the Secondary Coordination Sphere to Control Catalytic Events at the Metal Center: Biomimetic Oxo Transfer Chemistry of Nickel Amidate Complex

High-valent metal-oxo species are key intermediates for the oxygen atom transfer step in the catalytic cycles of many metalloenzymes. While the redox-active metal centers of such enzymes are typically supported by anionic amino acid side chains or porphyrin rings, peptide backbones might function as strong electron-donating ligands to stabilize high oxidation states. To test the feasibility of this idea in synthetic settings, we have prepared a nickel(II) complex of new amido multidentate ligand. The mononuclear nickel complex of this N5 ligand catalyzes epoxidation reactions of a wide range of olefins by using mCPBA as a terminal oxidant. Notably, a remarkably high catalytic efficiency and selectivity were observed for terminal olefin substrates. We found that protonation of the secondary coordination sphere serves as the entry point to the catalytic cycle, in which high-valent nickel species is subsequently formed to carry out oxo-transfer reactions. A conceptually parallel process might allow metalloenzymes to control the catalytic cycle in the primary coordination sphere by using proton switch in the secondary coordination sphere

Highly stereoselective directed reactions and an efficient synthesis of azafuranoses from a chiral aziridine

Polyhydroxylated pyrrolidines, such as biologically important azafuranoses represented by the natural product (+)-2,5-imino-2,5,6-trideoxy-gulo-heptitol and its C(3)-epimer, were elaborated from a commercially available enantiomerically pure (2R)-hydroxymethylaziridine by highly stereoselective directed reactions in more than 61% overall yield. At first, the nucleophile 2-trimethylsilyloxyfuran was directed to (2R)-aziridine-2-carboxaldehyde by ZnBr2 to yield the unusual anti-addition product as a single isomer via the chelation-controlled transition. The ring opening of aziridine was followed by conjugate addition to give a cis-fused bicycle, which was converted to the target molecule after the required reductive operations