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Jeon, Sung Jae,Lee, Tae Ho,Han, Yong Woon,Moon, Doo Kyung Elsevier 2018 Polymer Vol.149 No.-
<P><B>Abstract</B></P> <P>A new building block of two-dimensional (2D) A<SUB>1</SUB>-π-A<SUB>2</SUB> copolymers for P(dDTPz-ID) and P(dDTPz-DTBT) was designed and synthesized. Their structures have two strong acceptor units (isoindigo and benzothiadiazole derivatives) in the backbone, respectively. It displayed a benefit of A<SUB>1</SUB>-A<SUB>2</SUB> building blocks, which is complementary and broad light absorption from 300 to 750 nm due to acceptors with different withdrawing strengths. Also, the introduction of dangling-thiophene, π unit allowed the formation of 2D-strcuture, which and led to effective and inter-chain packing of PC<SUB>71</SUB>BM for both copolymers. Two copolymers exhibited enhanced π-π stacking properties and had predominant face-on structure, which was confirmed by XRD. We also reviewed the optical, electrochemical, morphological, charge transport properties and performance compared with A<SUB>1</SUB>-A<SUB>2</SUB> copolymers for P(DTPz-ID) and P(DTPz-DTBT), respectively. The inverted device fabricated with optimized condition for P(dDTPz-DTBT) showed efficient charge transport from enhanced energy alignment, high V<SUB>oc</SUB> and dipole moment and fine morphology, and thus obtained 5.0% of best power conversion efficiency (PCE).</P> <P><B>Highlights</B></P> <P> <UL> <LI> Two-dimensional (2D) A<SUB>1</SUB>- π -A<SUB>2</SUB> new concept of copolymers was designed and synthesized. </LI> <LI> The copolymers were characterized through GPC, TGA, UV, CV, XRD and so on. </LI> <LI> Power conversion efficiency of the best device for P(dDTPz-DTBT) was reached to 5.0%. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Solvent engineering for high-performance inorganic–organic hybrid perovskite solar cells
Jeon, Nam Joong,Noh, Jun Hong,Kim, Young Chan,Yang, Woon Seok,Ryu, Seungchan,Seok, Sang Il Nature Publishing Group, a division of Macmillan P 2014 NATURE MATERIALS Vol.13 No.9
Organolead trihalide perovskite materials have been successfully used as light absorbers in efficient photovoltaic cells. Two different cell structures, based on mesoscopic metal oxides and planar heterojunctions have already demonstrated very impressive advances in performance. Here, we report a bilayer architecture comprising the key features of mesoscopic and planar structures obtained by a fully solution-based process. We used CH<SUB>3</SUB>NH<SUB>3</SUB> Pb(I<SUB>1 − x</SUB>Br<SUB>x</SUB>)<SUB>3</SUB> (x = 0.1–0.15) as the absorbing layer and poly(triarylamine) as a hole-transporting material. The use of a mixed solvent of γ-butyrolactone and dimethylsulphoxide (DMSO) followed by toluene drop-casting leads to extremely uniform and dense perovskite layers via a CH<SUB>3</SUB>NH<SUB>3</SUB>I–PbI<SUB>2</SUB>–DMSO intermediate phase, and enables the fabrication of remarkably improved solar cells with a certified power-conversion efficiency of 16.2% and no hysteresis. These results provide important progress towards the understanding of the role of solution-processing in the realization of low-cost and highly efficient perovskite solar cells.
Hybrid Neural Coded Modulation: Design and Training Methods
Sung Hoon Lim,Jiyong Han,Wonjong Noh,Yujae Song,Sang-Woon Jeon 한국통신학회 2022 ICT Express Vol.8 No.1
We propose a hybrid coded modulation scheme which composes of inner and outer codes. The outer-code can be any standard binary linear code with efficient soft decoding capability (e.g. low-density parity-check (LDPC) codes). The inner code is designed using a deep neural network (DNN) which takes the channel coded bits and outputs modulated symbols. For training the DNN, we propose to use a loss function that is inspired by the generalized mutual information. The resulting constellations are shown to outperform the conventional quadrature amplitude modulation (QAM) based coding scheme for modulation order 16 and 64 with 5G standard LDPC codes.
S-264 The impact of anemia on two-year clinical outcomes in patients with Acute MI undergoing PCI
( Sang Jin Jeon ),( Ji Young Park ),( Sung Kee Ryu ),( Jae Woong Choi ),( Seung Woon Rha ),( Byoung Geol Choi ),( Hong Seog Seo ),( Dong Joo Oh ) 대한내과학회 2016 대한내과학회 추계학술대회 Vol.2016 No.1
Background:?Anemia is an aggravating factor of cardiovascular disease. However, it is controversial whether anemia itself has adverse impact on clinical outcomes of the patients with acute myocardial infarction (AMI) treated with percutaneous coronary intervention (PCI) with drug-eluting stents (DESs). Methods:?In this study, a total of 881 consecutive AMI patients underwent PCI between 2004 and 2010 were analyzed. Anemia was defined using WHO criteria: hemoglobin level <13 g/dL for men and <12 g/dL for women. The patients were divided into the two groups: the anemia group (n=349) and the non-anemia group (n=532). Six-month angiographic and 2-year major clinical outcomes were compared between the two groups. Results:?At baseline, the anemia group had more female, elderly, hypertension, diabetes mellitus, chronic renal-insufficiency, and higher levels of cardiac markers than the non-anemia group. At 6 months, major angiographic outcomes were similar between the two groups. The incidence of vascular complicat-ions during PCI and stent thrombosis were similar between the two groups. To adjust confounders, we performed propensity score matching (PSM) analysis, and after PSM, AMI patients with anemia had higher cumulative incidence of total death, cardiac death, recurrent myocardial infarction (MI), target lesion revascularization (TLR)-major adverse cardiac events (MACEs), and all MACEs up to 2 years. After PSM, multivariate analysis showed that the anemia was an independent predictor of death at 2 years?[adjusted OR; 2.5, CI; 1.3-4.9, p<0.001] Conclusions:?Anemia on admission in patients with AMI undergoing PCI with DESs was associated with higher individual and composite adverse cardiovascular events compared to those of AMI patients without anemia up to 2 years. Keywords:?Anemia, Myocardial infarction, Percutaneous coronary intervention