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Valekar, Anil H.,Batule, Bhagwan S.,Kim, Moon Il,Cho, Kyung-Ho,Hong, Do-Young,Lee, U-Hwang,Chang, Jong-San,Park, Hyun Gyu,Hwang, Young Kyu Elsevier 2018 Biosensors & Bioelectronics Vol.100 No.-
<P><B>Abstract</B></P> <P>We herein describe novel amine-grafted metal–organic frameworks (MOFs) as a promising alternative to natural peroxidase enzyme and their applications for a fluorescent assay of choline (Cho) and acetylcholine (ACh). Among diverse amine-functionalized MOFs, <I>N</I>,<I>N</I>,<I>N</I>′,<I>N</I>′-tetramethyl-1,4-butanediamine (TMBDA)-functionalized MIL-100(Fe) (TMBDA-MIL-100(Fe)) exhibited the highest peroxidase activity by developing intense fluorescence from Amplex UltraRed (AUR) in the presence of H<SUB>2</SUB>O<SUB>2</SUB>, which was presumably due to the synergetic effect of the enhanced negative potential and precisely controlled molecular size of the grafted diamine. Based on the excellent peroxidase-like activity of TMBDA-MIL-100(Fe), choline and ACh were reliably determined down to 0.027 and 0.036µM, respectively. Furthermore, practical applicability of this strategy was successfully demonstrated by detecting choline and ACh in spiked samples of milk and serum, respectively. This work highlights the advantages of amine-grafted MOFs for the preparation of biomimetic catalysts, extending their scope to biosensor applications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Various aliphatic diamines were grafted on coordinatively unsaturated metals sites of MIL-100(Fe) and subjected for peroxidase-like activity. </LI> <LI> Based on the excellent peroxidase-like activity of AFM, a simple and sensitive fluorescent detection of choline and acetylcholine was successfully performed. </LI> <LI> Effectively determined choline and acetylcholine levels in real samples of milk and serum, respectively. </LI> </UL> </P>
Ahn, Chang Won,Borse, Pramod H.,Kim, Ju Hun,Kim, Jae Young,Jang, Jum Suk,Cho, Chae-Ryong,Yoon, Jang-Hee,Lee, Byoung-seob,Bae, Jong-Seong,Kim, Hyun Gyu,Lee, Jae Sung Elsevier 2018 Applied Catalysis B Vol.224 No.-
<P><B>Abstract</B></P> <P>Highly uniform, self-supported PbTiO<SUB>3</SUB> nanotube arrays are fabricated on a transparent conducting glass by an all solution-based, hard-templating procedure. A new concept of site-isolation has been realized by Pt-sol infiltration only in the internal core of deposited nanotube arrays and thus physically separating electron and hole reaction sites on inside and external surface of the nanotubes, respectively. The effective charge separation by the site-isolated Pt-nanodot deposited PbTiO<SUB>3</SUB> nanotube photoanode leads to greatly enhanced photocurrent generation and H<SUB>2</SUB> evolution efficiencies relative to those of the particulate-type photoanode or PbTiO<SUB>3</SUB> nanotube without Pt infiltration in photoelectrochemical water splitting under visible light. The physical site isolation through nano-engineering of the material fabrication is expected to offer an effective strategy for preparation of high-efficiency photoelectrochemical devices.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Site-isolated Pt-dot@PbTiO<SUB>3</SUB> nanotube array is fabricated on FTO glass by an AAO templating method. </LI> <LI> It separates e<SUP>−</SUP> and h<SUP>+</SUP> reaction sites on inside and external surface of the nanotubes, respectively. </LI> <LI> The effective charge separation leads to greatly enhanced PEC water splitting activity. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
A New Off-Line ZVS PWM AC/DC Converter for Single Stage Preregulation in Distributed Power Systems
Jung G.Cho,Hwan H.Seong,Gyu H.Cho 전력전자학회 1992 ICPE(ISPE)논문집 Vol.1992 No.4
A new off-line ZVS PWM AC/DC converter for single stage preregulation in distributed power system is proposed by employing the actively clamped resonant dc-link(ACRDCL). The proposed AC/DC converter provides both of input power factor correction and the direct conversion from 110-220VAC line to 48VDC bus with single power stage. Comparing to conventional two-stage approach(boost rectifier followed by off-line DC/DC step down converter), the proposed approach reduces the loss of one power stage. Due to the distinctive advantages including simple topology, high efficiency due to single power stage conversion and ZVS, low EMI, low device voltage and current stress and PWM capability, the proposed converter can be operated at high frequency(200KHz) and high power level(up to several KW). Operational principle and control of the proposed converter together with the simulation results is presented.<br/>
Sohn, Yeong H.,Choi, Bo H.,Lee, Eun S.,Lim, Gyu C.,Gyu-Hyeong Cho,Rim, Chun T. Institute of Electrical and Electronics Engineers 2015 IEEE transactions on power electronics Vol. No.
<P>A general and systematic comparison of eight compensation schemes in the inductive power transfer system (IPTS) of single magnetic coupling and two capacitors is proposed in this paper. The characteristics of series-series (SS), series-parallel (SP), parallel-series (PS), and parallel-parallel (PP) compensation schemes for a voltage source or a current source are widely explored in terms of maximum efficiency, maximum power transfer, load-independent output voltage or current, magnetic coupling coefficient (k) independency, and allowance of no magnetic coupling (k = 0). Through comparative analyses using a general unified IPTS model, the current-source-type SS and SP are found to be superior to other compensation schemes in terms of the five criteria mentioned above, and they are found to have nearly the same efficiency, load power, and component stress characteristics for the same load quality factor. A design guideline for the current-source-type SS and SP is suggested and experimentally verified by a 200-W prototype of air coils at 100 kHz.</P>
GENERAL QUANTUM RESONANT CONVERTERS HAVING EQUIVALENT CHARACTERISTICS WITH PWM CONVERTERS
Gyu.B.Joung,Gyu.H.Cho 전력전자학회 1989 ICPE(ISPE)논문집 Vol.- No.-
General quantum resonant switches which are operated on zero current or zero voltage switching( ZCS, ZVS ) conditions are proposed and analyzed. The quantum resonant switches are modeled as inductances for series resonant converters(SRC's) and capacitances for parallel resonant converters(PRC's). For these reasons, the quantum resonant converters having the same characteristics as conventional PWM conveners can be constructed by changing inductor to quantum series resonant switch(QSRS) module and capacitor to quantum parallel resonant switch(QPRS) module. Minimum switch constructions of quantum resonant converters are also suggested. Dc and ac transfer functions of the quantum resonant converters are obtained from models of quantum resonant switches. For the verification of these models, the transient simulations of quantum buck SRC are compared with those of the equivalent ac model.