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Application of TRA in u-health system focusing on moderating effect of health privacy information
Mincheol Kim(김민철),Young-Bae Yang(양영배),Tai-Hyun Ha(하태현) 한국디지털콘텐츠학회 2016 한국디지털콘텐츠학회논문지 Vol.17 No.6
The purpose of this study is to analyze the moderating effect of health privacy information on the relationships between the factors that affect the behavioral intention of the usage of u-health system. Therefore, as a research hypothesis in TRA (Theory of Reasoned Action), self-efficacy and perceived usefulness will have a positive effect on the behavioral intention of the u-health system, and in the path, that health privacy information factor have a moderating effect on each path. This study used the PLS-SEM methodology to verify the proposed research model. As a result of the analysis, this study showed that the moderating effect of health privacy information in the model affects to some extent by the increase of R2 explanatory power. However, it was found that it was more consistent with the role of the independent variable rather than the moderating influence on the perceived usefulness.
Ultrabroadband Linear Power Amplifier Using a Frequency-Selective Analog Predistorter
Mincheol Seo,Kyungwon Kim,Minsu Kim,Hyungchul Kim,Jeongbae Jeon,Myung-Kyu Park,Hyojoon Lim,Youngoo Yang IEEE 2011 IEEE Transactions on Circuits and Systems II: Expr Vol.58 No.5
<P>This brief presents an ultrabroadband (2- to 600-MHz band) linear power amplifier using a compact frequency-selective analog predistorter, which includes a capacitor having an optimized capacitance and a biased Schottky diode connected in series. It is shunted at the input of the main amplifier and has a frequency-selective third-order intermodulation generation capability using its optimized capacitance. A two-stage push-pull power amplifier, which has an ultrabroadband operation range from 2 to 600 MHz, was implemented and linearized using the proposed analog predistorter. It exhibited high 1-dB compression point (P1 dB) and power-added efficiency characteristics of over 43 dBm and 32% at each P1 dB for the entire operating band, respectively. At an average output power level of 36 dBm for the two-tone signal input, which has a tone spacing of 1 MHz, its third-order intermodulation distortion over the entire band is no higher than -39.1 dBc after linearization, as compared with -34.2 dBc before linearization.</P>
Mincheol Seo,Hwiseob Lee,Jehyeon Gu,Hyungchul Kim,Ham, Junghyun,Wooyeol Choi,Yanghun Yun,Kenneth, K. O.,Youngoo Yang IEEE 2014 IEEE Transactions on Circuits and Systems II: Expr Vol. No.
<P>This brief presents an active second-harmonic injection technique to improve the efficiency and bandwidth for high-efficiency power amplifiers (PAs). An optimum third-harmonic termination condition was examined for higher efficiency after the second-harmonic injection using a multiharmonic load-pull simulation. It was determined that the optimum third-harmonic termination is the same as that of the inverse class-F PA. Based on this result, a high-efficiency PA with an optimized third-harmonic termination for the second-harmonic injection was designed for a center frequency of 1 GHz as a main amplifier. The overall system requires an auxiliary second-harmonic amplifier and a diplexer between the main and auxiliary PAs. The PA with an optimized third-harmonic termination for the second-harmonic injection was implemented using a 10-W GaN high-electron-mobility transistor for both the main and auxiliary power stages. Compared with the PA without second-harmonic injection, the bandwidth with a power-added efficiency of more than 80% is extended from 60 (960-1020 MHz) to 180 MHz (880-1060 MHz) after the second-harmonic injection.</P>
A 3–10 GHz CMOS low-noise amplifier using wire bond inductors
Yang, Miyoung,Ha, Mincheol,Park, Youngjin,Eo, Yunseong Wiley Subscription Services, Inc., A Wiley Company 2009 MICROWAVE AND OPTICAL TECHNOLOGY LETTERS Vol.51 No.2
<P>In this article, a small-sized 3–10 GHz CMOS LNA for ultra-wideband (UWB) applications is presented. To reduce 2 on-chip inductors, wire bond inductors are used instead of input inductor of multisectional reactive network and source degeneration inductor. The noise figure of low-noise amplifier (LNA) is 4 dB at minimum and IIP3 + 1.1 dBm at 5 GHz, respectively. The current consumption is 4 mA at 1.8 V supply. The LNA chip size including pads is 1 mm × 1 mm. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 414–416, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24082</P>