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Dang, Thi Tuyet Mai,Park, Sung-Jin,Park, Jong-Won,Chung, Dae-Sung,Park, Chan Eon,Kim, Yun-Hi,Kwon, Soon-Ki Wiley Subscription Services, Inc., A Wiley Company 2007 Journal of polymer science Part A, Polymer chemist Vol.45 No.22
<P>Poly{2,6-bis(3-dodecylthiophen-2-yl) benzo[1,2-b;4,5-b′]dithiophene} (PTBT) was synthesized, via oxidative polymerization by oxidative agent (FeCl<SUB>3</SUB>). The mole ratio of FeCl<SUB>3</SUB> and monomer (3.5:1), and keeping low temperature during the dropping of diluted catalyst were very important for the polymerization without crosslinking. The PTBT was confirmed by <SUP>1</SUP>H NMR, FTIR spectra, and elemental analysis. The PTBT has very good solubility in organic solvents such as chloroform, tetrahydrofuran, etc, and good thermal stability with T<SUB>g</SUB> of 164 °C. The PTBT shows UV-optical absorption at 406 nm and photoluminescence (PL) spectroscopy at 504 nm in a film. The highest occupied molecular orbital (HOMO) energy of the polymer is −5.71 eV by measuring cyclic voltammetry (CV). A solution-processed polymer thin film transistor device shows a mobility of 3 × 10<SUP>−5</SUP> – 8 × 10<SUP>−5</SUP> cm<SUP>2</SUP> V<SUP>−1</SUP> s<SUP>−1</SUP>, and an on/off current ratio of 10<SUP>4</SUP>. © 2007 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 45: 5277–5284, 2007</P> <B>Graphic Abstract</B> <P>A new poly(benzodithiophene) derivative was designed, synthesized, and characterized. The polymer has very good solubility in organic solvents and good thermal stability with T<SUB>g</SUB> of 164 °C. The polymer shows UV-optical absorption at 406 nm, photoluminescence spectroscopy at 504 nm in a film, and oxidative potential with HOMO level of −5.71 eV. A solution-processed polymer thin film transistor device shows a mobility of 3 × 10<SUP>−5</SUP> to 8 × 10<SUP>−5</SUP> cm<SUP>2</SUP> V<SUP>−1</SUP> s<SUP>−1</SUP>, and an on/off current ratio of 10<SUP>4</SUP>.</P><P> <img src='wiley_img/0887624X-2007-45-22-POLA22272-gra001.gif' alt='wiley_img/0887624X-2007-45-22-POLA22272-gra001'> </P>
On the performance of self-correction based modified min-sum decoding algorithms for LDPC codes
Eunyoung Cho(조은영),Mai Thi-Tuyet Dang,Dong Hyun Kong(공동현),Sang-Hyo Kim(김상효) 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.2
In this paper, we analyzed the performance of modified min-sum algorithms (MSA) for the decoding of low-density parity check codes. We focused on two self-correction based min-sum algorithms which erase variable node messages considered unreliable messages during decoding iterations. By comparing the error performances, it is confirmed that the self-correction based decoding algorithms have improved error performances compared with MSA and modified MSA.
Synthesis and characterization of diphenylaminodiphenyl stryl based alternating copolymers
Zhao, Qinghua,Kim, Yun-Hi,Dang, Thi Tuyet Mai,Shin, Dong-Cheol,You, Hong,Kwon, Soon-Ki Wiley Subscription Services, Inc., A Wiley Company 2007 Journal of polymer science Part A, Polymer chemist Vol.45 No.3
<P>Diphenylaminobiphenylated stryl based alternating copolymers with phenyl or fluorene, which were expected to have a terphenylene vinylene backbone containing an (N,N-diphenylamino)biphenyl pendant and a phenyl/fluorene/phenylene vinylene backbone containing an (N,N-diphenylamino)biphenyl pendant, were synthesized by a Suzuki coupling reaction. The obtained copolymers were confirmed with various types of spectroscopy. The alternating copolymers showed good hole-injection properties because of their low oxidation potential and good solubility and high thermal stability with a high glass-transition temperature. The alternating copolymers showed blue emissions because of the adjusted conjugation lengths; the maximum wavelength was 460 nm for poly{4,4′-biphenylene-α-[4″-(N,N′-diphenylamino)diphenyl]vinylene-alt-5-(2′-ethylhexyloxy)-2-methoxybenzene} and 487 nm for poly{4,4′-biphenylene-α-[4″-(N,N′-diphenylamino)diphenyl] vinylene-alt-9,9-dihexylfluorene}. The maximum brightness of indium tin oxide/poly(3,4-ethylene dioxythiophene)/polymer/LiF/Al devices with poly{4,4′-biphenylene-α-[4″-(N,N′-diphenylamino)diphenyl]vinylene-alt-5-(2′-ethylhexyloxy)-2-methoxybenzene} or poly{4,4′-biphenylene-α-[4″-(N,N′-diphenylamino)diphenyl]vinylene-alt-9,9-dihexylfluorene} as the emitting layer was 250 or 1000 cd/m<SUP>2</SUP>, respectively. © 2006 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 45: 341–347, 2007</P> <B>Graphic Abstract</B> <P>Poly{4,4′-biphenylene-α-[4″-(N,N′-diphenylamino)diphenyl]vinylene-alt-5-(2′-ethylhexyloxy)-2-methoxybenzene} and poly {4,4′-biphenylene-α-[4″-(N,N′-diphenylamino)diphenyl]vinylene-alt-9, 9-dihexylfluorene} had a regular structure of alternation between diphenylaminobiphenylated stryl and dihexylfluorene moieties or between diphenylaminobiphenylated stryl and 5-(2′-ethylhexyloxy)-2-methoxybenzene moieties. The indium tin oxide/poly(3,4-ethylene dioxythiophene)/polymer/LiF/Al devices with poly{4,4′-biphenylene-α-[4″-(N,N′-diphenylamino)diphenyl]vinylene-alt-5-(2′-ethylhexyloxy)-2-methoxybenzene} or poly{4,4′-biphenylene-α-[4″-(N,N′-diphenylamino) diphenyl]vinylene-alt-9,9-dihexylfluorene} as the emitting layer showed blue emissions (maximum wavelength = 460 or 487 nm) with maximum brightness of 250 or 1000 cd/m<SUP>2</SUP>, respectively. <img src='wiley_img/0887624X-2007-45-3-POLA21740-gra001.gif' alt='wiley_img/0887624X-2007-45-3-POLA21740-gra001'> </P>