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Jeong, Dong-Cheol,Lee, Jiyoung,Lee, Yunmi,Satheeshkumar, Chinnadurai,Song, Changsik American Chemical Society 2015 Macromolecules Vol.48 No.6
<P>The design and synthesis of photoactive polymeric systems are important in regard to solar energy harvesting and utilization. In this report, we synthesized photoactive polymeric thin films via iterative self-assembly using reversible metal–terpyridine (M–tpy) interactions. The growth rate of thin film deposition depends on the metal ion of choice. Ru(II)(tpy)<SUB>2</SUB>-incorporated poly(vinyl alcohol) also functionalized with tpy was subjected to iterative self-assembly on glass substrates. UV–vis spectroscopy and surface profilometer investigations show that the polymeric thin films with Cu(II) grew 2 times faster than those with Zn(II), attributed to the strong M–tpy interaction. Interestingly, photocurrent generated in the polymeric thin films with Zn(II) was much higher than those of other films. The apparent diffusion rate constant (<I>k</I><SUB>app</SUB>) was measured for the electron hopping process via potential-step chronoamperometry. As a result, the <I>k</I><SUB>app</SUB> for the polymeric thin films with Zn(II) was almost 2 times larger than those with other metal ions. The choice of metal ions appears crucial in the mixed metal–tpy complex systems not only for the film growth but also for the efficient photoinduced electron transfer.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/mamobx/2015/mamobx.2015.48.issue-6/ma502619a/production/images/medium/ma-2014-02619a_0003.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ma502619a'>ACS Electronic Supporting Info</A></P>
Effects of Substituent on Binaphthyl Hinge-Containing Conductive Polymers
Jeong, Dong-Cheol,Lee, Hyekyung,Yang, Ki Seok,Song, Changsik American Chemical Society 2012 Macromolecules Vol.45 No.24
<P>Conductive polymers containing hinged 1,1′-binaphthyl were synthesized. Their conformational flexibility around the 1,1′ C–C bonds was found to vary with the substituents at the 2,2′-positionshydroxy, linear alkyloxy, and macrocyclic alkyloxy groups were compared. Macrocyclic alkyloxy groups appeared to immobilize the binaphthyl. The connection patterns of electroactive oligothiophenes to the binaphthyl groups were also investigated with 6,6′- and 7,7′-attachments. The substituents binaphthyl polymers were examined using cyclic voltammetry, <I>in situ</I> conductivity measurements, and spectroelectrochemistry. Their electronic properties were found to vary greatly with the substituents and their connectivity. Binaphthyl polymer with hydroxyls and 3,4-ethylenedioxythiophenes exhibited interesting charge-trapping properties. 7,7′-Substitution led to intrachain interactions, which were promoted by the presence of linear alkyl chains. The observed properties give binaphthyl hinge-containing conductive polymers potential applicability in chiral electroactive sensors, polymer actuators, and electrochromic and optoelectronic devices.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/mamobx/2012/mamobx.2012.45.issue-24/ma301899e/production/images/medium/ma-2012-01899e_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ma301899e'>ACS Electronic Supporting Info</A></P>
Jeong, Dong-Cheol,Song, Sun Gu,Satheeshkumar, Chinnadurai,Lee, Yunmi,Kim, Kyung-su,Song, Changsik Elsevier 2015 Polymer Vol.69 No.-
<P><B>Abstract</B></P> <P>In this study, self-assembled Ru-containing polymer-MWNTs hybrid thin films were synthesized using metal-ligand (terpyridine, (tpy)) interactions. The subsequent deposition of tpy and Ru-functionalized polymer (tpy-PVA-Ru) with metal ions such as Zn(II) or Cu(II) and tpy-functionalized MWNT resulted in photoactive polymer-MWNTs hybrid thin films. The photoinduced electron transfer from Ru complexes in the polymer films to the indium tin oxide electrode was observed. Although Cu(II)-tpy linkages produced thicker hybrid films owing to the stronger binding energy than those of the Zn(II)-tpy linkages, the photocurrents of the hybrid films with Cu(II) were much smaller than those with Zn(II), probably attributed to the slower electron hopping rates inside the films. However, the anodic photocurrents increased with the inclusion of the MWNTs layer; the polymer-MWNTs hybrid films fabricated by Cu(II) and Zn(II) show 2.2- and 1.4 folds enhanced photocurrent when compared to the thin films without MWNTs. Potential-step chronoamperometry showed that the electron hopping rate constants significantly improved with the inclusion of MWNTs, which may have provided an efficient electron transfer pathway.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We prepared self-assembled Ru-containing polymer-MWNTs hybrid thin films. </LI> <LI> We found that the anodic photocurrents were generated under the irradiation. </LI> <LI> The photocurrent densities were well correlated with the electron-hopping rate constants. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Switching Battery Charger Integrated Circuit for Mobile Devices in a 130-nm BCDMOS Process
Jeong, Min-Gyu,Kim, Sang-Hyun,Yoo, Changsik IEEE 2016 IEEE transactions on power electronics Vol.31 No.11
<P>A switching battery charger integrated circuit (IC) for a mobile device is described which can regulate the system supply voltage and charge a Li-ion battery simultaneously. The charging current level is adaptively controlled according to the system load current and a battery can be forced to supply current to the system load when the input power is not sufficient. In order to allow a mobile device to supply power to peripheral devices, the battery charger IC can also be configured to operate as a boost dc-dc converter with the reversed direction of power flow. The operation mode of the battery charger IC is smoothly switched by adopting a diode-based mode selection scheme. Implemented in a 130-nm BCDMOS process, the battery charger IC occupies 12.25 mm(2) and has been verified to provide the appropriate charging profile for a Li-ion battery and regulate the system supply voltage under various operating conditions. The maximum charging current is 1.5 A and the output voltage ranges from 2.5 to 4.2 V. The maximum power efficiency of dc-dc conversion is 90% and 92%, respectively, for the buck and boost modes.</P>
Pak, Changsik,Park, Jihoon,Hong, Jinmyung,Jeong, Jaehoon,Bang, Saik,Heo, Chan Yeong Korean Society of Plastic and Reconstructive Surge 2015 Archives of Plastic Surgery Vol.42 No.6
Background We conducted this clinical study to compare the efficacy and safety between Neuramis Deep and Restylane in the correction of nasolabial folds. Methods In this phase III, randomized, multi-center, double-masked, matched-pairs, active-controlled trial (ClinicalTrials.gov Identifier: NCT01585220), we evaluated a total of 67 subjects (n=67). All the subjects underwent Neuramis Deep treatment on one side and Restylane on the contralateral side of the bilateral nasolabial folds at a ratio of 1:1. To compare the efficacy of Neuramis Deep and Restylane, we evaluated the Wrinkle Severity Rating Scale scores and those of the Global Aesthetic Improvement Scale. In addition, we compared the safety of Neuramis Deep and Restylane based on adverse events, physical examination, and clinical laboratory tests. Results Neuramis Deep was not inferior in improving the nasolabial folds as compared with Restylane. In addition, there was no significant difference in the efficacy between Neuramis Deep and Restylane. There were no significant differences in safety parameters between Neuramis Deep and Restylane. Conclusions In conclusion, our results indicate that Neuramis Deep may be a safe, effective material for improving the nasolabial folds. However, further studies are warranted to compare the tolerability of Neuramis Deep and Restylane based on histopathologic findings.
Donghyeok Jeong,Jinho Noh,Jisoo Lee,Changsik Yoo 대한전자공학회 2018 Journal of semiconductor technology and science Vol.18 No.4
The tolerance of a continuous-time (CT) sigma-delta modulator (SDM) to the sampling clock jitter can be greatly improved by a self-resetting return-to-zero (SR-RZ) feedback digital-to-analog converter (DAC). The pulse width of the SR-RZ DAC output is adaptively determined so the desired amount of charge to be delivered to the loop filter regardless of the sampling clock jitter. Implemented in a 65-nm CMOS process, a third-order 20-kHz bandwidth (BW) CT-SDM with the proposed SR-RZ DAC has 87.4-dB peak signal-to-noise+distortion ratio (SNDR). The CT-SDM shows no performance degradation even with up to 5-% unit interval (UI) root-mean-square (RMS) clock jitter.